--- /dev/null
+/*-
+ * Copyright (c) 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#undef _GNU_SOURCE
+#undef ASH_TYPE
+#undef ASH_GETOPTS
+#undef ASH_MATH_SUPPORT
+
+#include <assert.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <paths.h>
+#include <pwd.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/cdefs.h>
+#include <sys/ioctl.h>
+#include <sys/param.h>
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+
+#if !defined(FNMATCH_BROKEN)
+#include <fnmatch.h>
+#endif
+#if !defined(GLOB_BROKEN)
+#include <glob.h>
+#endif
+
+#if JOBS
+#include <termios.h>
+#undef CEOF /* syntax.h redefines this */
+#endif
+
+#include "cmdedit.h"
+#include "busybox.h"
+#include "ash.h"
+
+
+#define _DIAGASSERT(x)
+
+#define ATABSIZE 39
+
+#define S_DFL 1 /* default signal handling (SIG_DFL) */
+#define S_CATCH 2 /* signal is caught */
+#define S_IGN 3 /* signal is ignored (SIG_IGN) */
+#define S_HARD_IGN 4 /* signal is ignored permenantly */
+#define S_RESET 5 /* temporary - to reset a hard ignored sig */
+
+
+
+struct alias *atab[ATABSIZE];
+
+static void setalias __P((char *, char *));
+static struct alias **hashalias __P((const char *));
+static struct alias *freealias __P((struct alias *));
+static struct alias **__lookupalias __P((const char *));
+static char *trap[NSIG]; /* trap handler commands */
+static char sigmode[NSIG - 1]; /* current value of signal */
+static char gotsig[NSIG - 1]; /* indicates specified signal received */
+static int pendingsigs; /* indicates some signal received */
+
+
+static void
+setalias(name, val)
+ char *name, *val;
+{
+ struct alias *ap, **app;
+
+ app = __lookupalias(name);
+ ap = *app;
+ INTOFF;
+ if (ap) {
+ if (!(ap->flag & ALIASINUSE)) {
+ ckfree(ap->val);
+ }
+ ap->val = savestr(val);
+ ap->flag &= ~ALIASDEAD;
+ } else {
+ /* not found */
+ ap = ckmalloc(sizeof (struct alias));
+ ap->name = savestr(name);
+ ap->val = savestr(val);
+ ap->flag = 0;
+ ap->next = 0;
+ *app = ap;
+ }
+ INTON;
+}
+
+static int
+unalias(name)
+ char *name;
+ {
+ struct alias **app;
+
+ app = __lookupalias(name);
+
+ if (*app) {
+ INTOFF;
+ *app = freealias(*app);
+ INTON;
+ return (0);
+ }
+
+ return (1);
+}
+
+#ifdef mkinit
+static void rmaliases __P((void));
+
+SHELLPROC {
+ rmaliases();
+}
+#endif
+
+static void
+rmaliases() {
+ struct alias *ap, **app;
+ int i;
+
+ INTOFF;
+ for (i = 0; i < ATABSIZE; i++) {
+ app = &atab[i];
+ for (ap = *app; ap; ap = *app) {
+ *app = freealias(*app);
+ if (ap == *app) {
+ app = &ap->next;
+ }
+ }
+ }
+ INTON;
+}
+
+struct alias *
+lookupalias(name, check)
+ const char *name;
+ int check;
+{
+ struct alias *ap = *__lookupalias(name);
+
+ if (check && ap && (ap->flag & ALIASINUSE))
+ return (NULL);
+ return (ap);
+}
+
+
+/*
+ * TODO - sort output
+ */
+static int
+aliascmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char *n, *v;
+ int ret = 0;
+ struct alias *ap;
+
+ if (argc == 1) {
+ int i;
+
+ for (i = 0; i < ATABSIZE; i++)
+ for (ap = atab[i]; ap; ap = ap->next) {
+ printalias(ap);
+ }
+ return (0);
+ }
+ while ((n = *++argv) != NULL) {
+ if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */
+ if ((ap = *__lookupalias(n)) == NULL) {
+ outfmt(out2, "%s: %s not found\n", "alias", n);
+ ret = 1;
+ } else
+ printalias(ap);
+ }
+ else {
+ *v++ = '\0';
+ setalias(n, v);
+ }
+ }
+
+ return (ret);
+}
+
+static int
+unaliascmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int i;
+
+ while ((i = nextopt("a")) != '\0') {
+ if (i == 'a') {
+ rmaliases();
+ return (0);
+ }
+ }
+ for (i = 0; *argptr; argptr++) {
+ if (unalias(*argptr)) {
+ outfmt(out2, "%s: %s not found\n", "unalias", *argptr);
+ i = 1;
+ }
+ }
+
+ return (i);
+}
+
+static struct alias **
+hashalias(p)
+ const char *p;
+ {
+ unsigned int hashval;
+
+ hashval = *p << 4;
+ while (*p)
+ hashval+= *p++;
+ return &atab[hashval % ATABSIZE];
+}
+
+static struct alias *
+freealias(struct alias *ap) {
+ struct alias *next;
+
+ if (ap->flag & ALIASINUSE) {
+ ap->flag |= ALIASDEAD;
+ return ap;
+ }
+
+ next = ap->next;
+ ckfree(ap->name);
+ ckfree(ap->val);
+ ckfree(ap);
+ return next;
+}
+
+static void
+printalias(const struct alias *ap) {
+ char *p;
+
+ p = single_quote(ap->val);
+ out1fmt("alias %s=%s\n", ap->name, p);
+ stunalloc(p);
+}
+
+static struct alias **
+__lookupalias(const char *name) {
+ struct alias **app = hashalias(name);
+
+ for (; *app; app = &(*app)->next) {
+ if (equal(name, (*app)->name)) {
+ break;
+ }
+ }
+
+ return app;
+}
+
+#ifdef ASH_MATH_SUPPORT
+/* The generated file arith.c has been snipped. If you want this
+ * stuff back in, feel free to add it to your own copy. */
+#endif
+
+/*
+ * This file was generated by the mkbuiltins program.
+ */
+
+static int bgcmd __P((int, char **));
+static int breakcmd __P((int, char **));
+static int cdcmd __P((int, char **));
+static int commandcmd __P((int, char **));
+static int dotcmd __P((int, char **));
+static int evalcmd __P((int, char **));
+static int execcmd __P((int, char **));
+static int exitcmd __P((int, char **));
+static int exportcmd __P((int, char **));
+static int histcmd __P((int, char **));
+static int fgcmd __P((int, char **));
+static int hashcmd __P((int, char **));
+static int jobscmd __P((int, char **));
+static int killcmd __P((int, char **));
+static int localcmd __P((int, char **));
+static int pwdcmd __P((int, char **));
+static int readcmd __P((int, char **));
+static int returncmd __P((int, char **));
+static int setcmd __P((int, char **));
+static int setvarcmd __P((int, char **));
+static int shiftcmd __P((int, char **));
+static int trapcmd __P((int, char **));
+static int umaskcmd __P((int, char **));
+static int unaliascmd __P((int, char **));
+static int unsetcmd __P((int, char **));
+static int waitcmd __P((int, char **));
+static int aliascmd __P((int, char **));
+static int ulimitcmd __P((int, char **));
+static int timescmd __P((int, char **));
+#ifdef ASH_MATH_SUPPORT
+static int expcmd __P((int, char **));
+#endif
+#ifdef ASH_TYPE
+static int typecmd __P((int, char **));
+#endif
+#ifdef ASH_GETOPTS
+static int getoptscmd __P((int, char **));
+#endif
+#ifndef BB_TRUE_FALSE
+static int true_main __P((int, char **));
+static int false_main __P((int, char **));
+#endif
+
+static struct builtincmd *DOTCMD;
+static struct builtincmd *BLTINCMD;
+static struct builtincmd *COMMANDCMD;
+static struct builtincmd *EXECCMD;
+static struct builtincmd *EVALCMD;
+
+/* It is CRUCIAL that this listing be kept in ascii order, otherwise
+ * the binary search in find_builtin() will stop working. If you value
+ * your kneecaps, you'll be sure to *make sure* that any changes made
+ * to this array result in the listing remaining in ascii order. You
+ * have been warned.
+ */
+static const struct builtincmd builtincmds[] = {
+ { ".", dotcmd, 1 },
+ { ":", true_main, 1 },
+ { "alias", aliascmd, 6 },
+ { "bg", bgcmd, 2 },
+ { "break", breakcmd, 1 },
+ { "builtin", bltincmd, 1 },
+ { "cd", cdcmd, 2 },
+ { "chdir", cdcmd, 0 },
+ { "command", commandcmd, 2 },
+ { "continue", breakcmd, 1 },
+ { "eval", evalcmd, 1 },
+ { "exec", execcmd, 1 },
+ { "exit", exitcmd, 1 },
+#ifdef ASH_MATH_SUPPORT
+ { "exp", expcmd, 0 },
+#endif
+ { "export", exportcmd, 5 },
+ { "false", false_main, 2 },
+ { "fc", histcmd, 2 },
+ { "fg", fgcmd, 2 },
+#ifdef ASH_GETOPTS
+ { "getopts", getoptscmd, 2 },
+#endif
+ { "hash", hashcmd, 0 },
+ { "jobs", jobscmd, 2 },
+ { "kill", killcmd, 2 },
+#ifdef ASH_MATH_SUPPORT
+ { "let", expcmd, 0 },
+#endif
+ { "local", localcmd, 4 },
+ { "pwd", pwdcmd, 0 },
+ { "read", readcmd, 2 },
+ { "readonly", exportcmd, 5 },
+ { "return", returncmd, 1 },
+ { "set", setcmd, 1 },
+ { "setvar", setvarcmd, 0 },
+ { "shift", shiftcmd, 1 },
+ { "times", timescmd, 1 },
+ { "trap", trapcmd, 1 },
+ { "true", true_main, 2 },
+#ifdef ASH_TYPE
+ { "type", typecmd, 0 },
+#endif
+ { "ulimit", ulimitcmd, 0 },
+ { "umask", umaskcmd, 2 },
+ { "unalias", unaliascmd, 2 },
+ { "unset", unsetcmd, 1 },
+ { "wait", waitcmd, 2 },
+};
+#define NUMBUILTINS (sizeof (builtincmds) / sizeof (struct builtincmd) )
+
+
+/* $NetBSD: cd.c,v 1.27 1999/07/09 03:05:49 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+static int docd __P((char *, int));
+static char *getcomponent __P((void));
+static void updatepwd __P((char *));
+static void getpwd __P((void));
+
+static char *curdir = nullstr; /* current working directory */
+static char *cdcomppath;
+
+#ifdef mkinit
+INCLUDE "cd.h"
+INIT {
+ setpwd(0, 0);
+}
+#endif
+
+static int
+cdcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ const char *dest;
+ const char *path;
+ char *p;
+ struct stat statb;
+ int print = 0;
+
+ nextopt(nullstr);
+ if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME")) == NULL)
+ error("HOME not set");
+ if (*dest == '\0')
+ dest = ".";
+ if (dest[0] == '-' && dest[1] == '\0') {
+ dest = bltinlookup("OLDPWD");
+ if (!dest || !*dest) {
+ dest = curdir;
+ }
+ print = 1;
+ if (dest)
+ print = 1;
+ else
+ dest = ".";
+ }
+ if (*dest == '/' || (path = bltinlookup("CDPATH")) == NULL)
+ path = nullstr;
+ while ((p = padvance(&path, dest)) != NULL) {
+ if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
+ if (!print) {
+ /*
+ * XXX - rethink
+ */
+ if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
+ p += 2;
+ print = strcmp(p, dest);
+ }
+ if (docd(p, print) >= 0)
+ return 0;
+
+ }
+ }
+ error("can't cd to %s", dest);
+ /* NOTREACHED */
+}
+
+
+/*
+ * Actually do the chdir. In an interactive shell, print the
+ * directory name if "print" is nonzero.
+ */
+
+static int
+docd(dest, print)
+ char *dest;
+ int print;
+{
+ char *p;
+ char *q;
+ char *component;
+ struct stat statb;
+ int first;
+ int badstat;
+
+ TRACE(("docd(\"%s\", %d) called\n", dest, print));
+
+ /*
+ * Check each component of the path. If we find a symlink or
+ * something we can't stat, clear curdir to force a getcwd()
+ * next time we get the value of the current directory.
+ */
+ badstat = 0;
+ cdcomppath = sstrdup(dest);
+ STARTSTACKSTR(p);
+ if (*dest == '/') {
+ STPUTC('/', p);
+ cdcomppath++;
+ }
+ first = 1;
+ while ((q = getcomponent()) != NULL) {
+ if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
+ continue;
+ if (! first)
+ STPUTC('/', p);
+ first = 0;
+ component = q;
+ while (*q)
+ STPUTC(*q++, p);
+ if (equal(component, ".."))
+ continue;
+ STACKSTRNUL(p);
+ if ((lstat(stackblock(), &statb) < 0)
+ || (S_ISLNK(statb.st_mode))) {
+ /* print = 1; */
+ badstat = 1;
+ break;
+ }
+ }
+
+ INTOFF;
+ if (chdir(dest) < 0) {
+ INTON;
+ return -1;
+ }
+ updatepwd(badstat ? NULL : dest);
+ INTON;
+ if (print && iflag)
+ out1fmt(snlfmt, curdir);
+ return 0;
+}
+
+
+/*
+ * Get the next component of the path name pointed to by cdcomppath.
+ * This routine overwrites the string pointed to by cdcomppath.
+ */
+
+static char *
+getcomponent() {
+ char *p;
+ char *start;
+
+ if ((p = cdcomppath) == NULL)
+ return NULL;
+ start = cdcomppath;
+ while (*p != '/' && *p != '\0')
+ p++;
+ if (*p == '\0') {
+ cdcomppath = NULL;
+ } else {
+ *p++ = '\0';
+ cdcomppath = p;
+ }
+ return start;
+}
+
+
+
+/*
+ * Update curdir (the name of the current directory) in response to a
+ * cd command. We also call hashcd to let the routines in exec.c know
+ * that the current directory has changed.
+ */
+
+static void
+updatepwd(dir)
+ char *dir;
+ {
+ char *new;
+ char *p;
+ size_t len;
+
+ hashcd(); /* update command hash table */
+
+ /*
+ * If our argument is NULL, we don't know the current directory
+ * any more because we traversed a symbolic link or something
+ * we couldn't stat().
+ */
+ if (dir == NULL || curdir == nullstr) {
+ setpwd(0, 1);
+ return;
+ }
+ len = strlen(dir);
+ cdcomppath = sstrdup(dir);
+ STARTSTACKSTR(new);
+ if (*dir != '/') {
+ p = curdir;
+ while (*p)
+ STPUTC(*p++, new);
+ if (p[-1] == '/')
+ STUNPUTC(new);
+ }
+ while ((p = getcomponent()) != NULL) {
+ if (equal(p, "..")) {
+ while (new > stackblock() && (STUNPUTC(new), *new) != '/');
+ } else if (*p != '\0' && ! equal(p, ".")) {
+ STPUTC('/', new);
+ while (*p)
+ STPUTC(*p++, new);
+ }
+ }
+ if (new == stackblock())
+ STPUTC('/', new);
+ STACKSTRNUL(new);
+ setpwd(stackblock(), 1);
+}
+
+
+
+static int
+pwdcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ out1fmt(snlfmt, curdir);
+ return 0;
+}
+
+
+
+
+#define MAXPWD 256
+
+/*
+ * Find out what the current directory is. If we already know the current
+ * directory, this routine returns immediately.
+ */
+static void
+getpwd()
+{
+ char buf[MAXPWD];
+
+ /*
+ * Things are a bit complicated here; we could have just used
+ * getcwd, but traditionally getcwd is implemented using popen
+ * to /bin/pwd. This creates a problem for us, since we cannot
+ * keep track of the job if it is being ran behind our backs.
+ * So we re-implement getcwd(), and we suppress interrupts
+ * throughout the process. This is not completely safe, since
+ * the user can still break out of it by killing the pwd program.
+ * We still try to use getcwd for systems that we know have a
+ * c implementation of getcwd, that does not open a pipe to
+ * /bin/pwd.
+ */
+#if defined(__NetBSD__) || defined(__SVR4) || defined(__GLIBC__)
+
+ if (getcwd(buf, sizeof(buf)) == NULL) {
+ char *pwd = getenv("PWD");
+ struct stat stdot, stpwd;
+
+ if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
+ stat(pwd, &stpwd) != -1 &&
+ stdot.st_dev == stpwd.st_dev &&
+ stdot.st_ino == stpwd.st_ino) {
+ curdir = savestr(pwd);
+ return;
+ }
+ error("getcwd() failed: %s", strerror(errno));
+ }
+ curdir = savestr(buf);
+#else
+ {
+ char *p;
+ int i;
+ int status;
+ struct job *jp;
+ int pip[2];
+
+ if (pipe(pip) < 0)
+ error("Pipe call failed");
+ jp = makejob((union node *)NULL, 1);
+ if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) {
+ (void) close(pip[0]);
+ if (pip[1] != 1) {
+ close(1);
+ dup_as_newfd(pip[1], 1);
+ close(pip[1]);
+ }
+ (void) execl("/bin/pwd", "pwd", (char *)0);
+ error("Cannot exec /bin/pwd");
+ }
+ (void) close(pip[1]);
+ pip[1] = -1;
+ p = buf;
+ while ((i = read(pip[0], p, buf + MAXPWD - p)) > 0
+ || (i == -1 && errno == EINTR)) {
+ if (i > 0)
+ p += i;
+ }
+ (void) close(pip[0]);
+ pip[0] = -1;
+ status = waitforjob(jp);
+ if (status != 0)
+ error((char *)0);
+ if (i < 0 || p == buf || p[-1] != '\n')
+ error("pwd command failed");
+ p[-1] = '\0';
+ }
+ curdir = savestr(buf);
+#endif
+}
+
+static void
+setpwd(const char *val, int setold)
+{
+ if (setold) {
+ setvar("OLDPWD", curdir, VEXPORT);
+ }
+ INTOFF;
+ if (curdir != nullstr) {
+ free(curdir);
+ curdir = nullstr;
+ }
+ if (!val) {
+ getpwd();
+ } else {
+ curdir = savestr(val);
+ }
+ INTON;
+ setvar("PWD", curdir, VEXPORT);
+}
+
+/* $NetBSD: error.c,v 1.23 2000/07/03 03:26:19 matt Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Errors and exceptions.
+ */
+
+/*
+ * Code to handle exceptions in C.
+ */
+
+struct jmploc *handler;
+static int exception;
+volatile int suppressint;
+volatile int intpending;
+
+
+static void exverror __P((int, const char *, va_list))
+ __attribute__((__noreturn__));
+
+/*
+ * Called to raise an exception. Since C doesn't include exceptions, we
+ * just do a longjmp to the exception handler. The type of exception is
+ * stored in the global variable "exception".
+ */
+
+static void
+exraise(e)
+ int e;
+{
+#ifdef DEBUG
+ if (handler == NULL)
+ abort();
+#endif
+ exception = e;
+ longjmp(handler->loc, 1);
+}
+
+
+/*
+ * Called from trap.c when a SIGINT is received. (If the user specifies
+ * that SIGINT is to be trapped or ignored using the trap builtin, then
+ * this routine is not called.) Suppressint is nonzero when interrupts
+ * are held using the INTOFF macro. The call to _exit is necessary because
+ * there is a short period after a fork before the signal handlers are
+ * set to the appropriate value for the child. (The test for iflag is
+ * just defensive programming.)
+ */
+
+static void
+onint() {
+ sigset_t mysigset;
+
+ if (suppressint) {
+ intpending++;
+ return;
+ }
+ intpending = 0;
+ sigemptyset(&mysigset);
+ sigprocmask(SIG_SETMASK, &mysigset, NULL);
+ if (rootshell && iflag)
+ exraise(EXINT);
+ else {
+ signal(SIGINT, SIG_DFL);
+ raise(SIGINT);
+ }
+ /* NOTREACHED */
+}
+
+
+/*
+ * Exverror is called to raise the error exception. If the first argument
+ * is not NULL then error prints an error message using printf style
+ * formatting. It then raises the error exception.
+ */
+static void
+exverror(cond, msg, ap)
+ int cond;
+ const char *msg;
+ va_list ap;
+{
+ CLEAR_PENDING_INT;
+ INTOFF;
+
+#ifdef DEBUG
+ if (msg)
+ TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
+ else
+ TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
+#endif
+ if (msg) {
+ if (commandname)
+ outfmt(&errout, "%s: ", commandname);
+ doformat(&errout, msg, ap);
+#if FLUSHERR
+ outc('\n', &errout);
+#else
+ outcslow('\n', &errout);
+#endif
+ }
+ flushall();
+ exraise(cond);
+ /* NOTREACHED */
+}
+
+
+#ifdef __STDC__
+static void
+error(const char *msg, ...)
+#else
+static void
+error(va_alist)
+ va_dcl
+#endif
+{
+#ifndef __STDC__
+ const char *msg;
+#endif
+ va_list ap;
+#ifdef __STDC__
+ va_start(ap, msg);
+#else
+ va_start(ap);
+ msg = va_arg(ap, const char *);
+#endif
+ exverror(EXERROR, msg, ap);
+ /* NOTREACHED */
+ va_end(ap);
+}
+
+
+#ifdef __STDC__
+static void
+exerror(int cond, const char *msg, ...)
+#else
+static void
+exerror(va_alist)
+ va_dcl
+#endif
+{
+#ifndef __STDC__
+ int cond;
+ const char *msg;
+#endif
+ va_list ap;
+#ifdef __STDC__
+ va_start(ap, msg);
+#else
+ va_start(ap);
+ cond = va_arg(ap, int);
+ msg = va_arg(ap, const char *);
+#endif
+ exverror(cond, msg, ap);
+ /* NOTREACHED */
+ va_end(ap);
+}
+
+
+
+/*
+ * Table of error messages.
+ */
+
+struct errname {
+ short errcode; /* error number */
+ short action; /* operation which encountered the error */
+ const char *msg; /* text describing the error */
+};
+
+
+#define ALL (E_OPEN|E_CREAT|E_EXEC)
+
+static const struct errname errormsg[] = {
+ { EINTR, ALL, "interrupted" },
+ { EACCES, ALL, "permission denied" },
+ { EIO, ALL, "I/O error" },
+ { ENOENT, E_OPEN, "no such file" },
+ { ENOENT, E_CREAT,"directory nonexistent" },
+ { ENOENT, E_EXEC, "not found" },
+ { ENOTDIR, E_OPEN, "no such file" },
+ { ENOTDIR, E_CREAT,"directory nonexistent" },
+ { ENOTDIR, E_EXEC, "not found" },
+ { EISDIR, ALL, "is a directory" },
+ { EEXIST, E_CREAT,"file exists" },
+#ifdef notdef
+ { EMFILE, ALL, "too many open files" },
+#endif
+ { ENFILE, ALL, "file table overflow" },
+ { ENOSPC, ALL, "file system full" },
+#ifdef EDQUOT
+ { EDQUOT, ALL, "disk quota exceeded" },
+#endif
+#ifdef ENOSR
+ { ENOSR, ALL, "no streams resources" },
+#endif
+ { ENXIO, ALL, "no such device or address" },
+ { EROFS, ALL, "read-only file system" },
+ { ETXTBSY, ALL, "text busy" },
+#ifdef SYSV
+ { EAGAIN, E_EXEC, "not enough memory" },
+#endif
+ { ENOMEM, ALL, "not enough memory" },
+#ifdef ENOLINK
+ { ENOLINK, ALL, "remote access failed" },
+#endif
+#ifdef EMULTIHOP
+ { EMULTIHOP, ALL, "remote access failed" },
+#endif
+#ifdef ECOMM
+ { ECOMM, ALL, "remote access failed" },
+#endif
+#ifdef ESTALE
+ { ESTALE, ALL, "remote access failed" },
+#endif
+#ifdef ETIMEDOUT
+ { ETIMEDOUT, ALL, "remote access failed" },
+#endif
+#ifdef ELOOP
+ { ELOOP, ALL, "symbolic link loop" },
+#endif
+ { E2BIG, E_EXEC, "argument list too long" },
+#ifdef ELIBACC
+ { ELIBACC, E_EXEC, "shared library missing" },
+#endif
+ { 0, 0, NULL },
+};
+
+
+/*
+ * Return a string describing an error. The returned string may be a
+ * pointer to a static buffer that will be overwritten on the next call.
+ * Action describes the operation that got the error.
+ */
+
+static const char *
+errmsg(e, action)
+ int e;
+ int action;
+{
+ struct errname const *ep;
+ static char buf[12];
+
+ for (ep = errormsg ; ep->errcode ; ep++) {
+ if (ep->errcode == e && (ep->action & action) != 0)
+ return ep->msg;
+ }
+ fmtstr(buf, sizeof buf, "error %d", e);
+ return buf;
+}
+
+
+#ifdef REALLY_SMALL
+static void
+__inton() {
+ if (--suppressint == 0 && intpending) {
+ onint();
+ }
+}
+#endif
+/* $NetBSD: eval.c,v 1.57 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+/* flags in argument to evaltree */
+#define EV_EXIT 01 /* exit after evaluating tree */
+#define EV_TESTED 02 /* exit status is checked; ignore -e flag */
+#define EV_BACKCMD 04 /* command executing within back quotes */
+
+static int evalskip; /* set if we are skipping commands */
+static int skipcount; /* number of levels to skip */
+static int loopnest; /* current loop nesting level */
+static int funcnest; /* depth of function calls */
+
+
+static char *commandname;
+struct strlist *cmdenviron;
+static int exitstatus; /* exit status of last command */
+static int oexitstatus; /* saved exit status */
+
+
+static void evalloop __P((union node *, int));
+static void evalfor __P((union node *, int));
+static void evalcase __P((union node *, int));
+static void evalsubshell __P((union node *, int));
+static void expredir __P((union node *));
+static void evalpipe __P((union node *));
+#ifdef notyet
+static void evalcommand __P((union node *, int, struct backcmd *));
+#else
+static void evalcommand __P((union node *, int));
+#endif
+static void prehash __P((union node *));
+static void eprintlist __P((struct strlist *));
+
+
+/*
+ * Called to reset things after an exception.
+ */
+
+#ifdef mkinit
+INCLUDE "eval.h"
+
+RESET {
+ evalskip = 0;
+ loopnest = 0;
+ funcnest = 0;
+}
+
+SHELLPROC {
+ exitstatus = 0;
+}
+#endif
+
+
+
+/*
+ * The eval commmand.
+ */
+
+static int
+evalcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char *p;
+ char *concat;
+ char **ap;
+
+ if (argc > 1) {
+ p = argv[1];
+ if (argc > 2) {
+ STARTSTACKSTR(concat);
+ ap = argv + 2;
+ for (;;) {
+ while (*p)
+ STPUTC(*p++, concat);
+ if ((p = *ap++) == NULL)
+ break;
+ STPUTC(' ', concat);
+ }
+ STPUTC('\0', concat);
+ p = grabstackstr(concat);
+ }
+ evalstring(p, EV_TESTED);
+ }
+ return exitstatus;
+}
+
+
+/*
+ * Execute a command or commands contained in a string.
+ */
+
+static void
+evalstring(s, flag)
+ char *s;
+ int flag;
+ {
+ union node *n;
+ struct stackmark smark;
+
+ setstackmark(&smark);
+ setinputstring(s);
+ while ((n = parsecmd(0)) != NEOF) {
+ evaltree(n, flag);
+ popstackmark(&smark);
+ }
+ popfile();
+ popstackmark(&smark);
+}
+
+
+
+/*
+ * Evaluate a parse tree. The value is left in the global variable
+ * exitstatus.
+ */
+
+static void
+evaltree(n, flags)
+ union node *n;
+ int flags;
+{
+ int checkexit = 0;
+ if (n == NULL) {
+ TRACE(("evaltree(NULL) called\n"));
+ goto out;
+ }
+ TRACE(("evaltree(0x%lx: %d) called\n", (long)n, n->type));
+ switch (n->type) {
+ case NSEMI:
+ evaltree(n->nbinary.ch1, flags & EV_TESTED);
+ if (evalskip)
+ goto out;
+ evaltree(n->nbinary.ch2, flags);
+ break;
+ case NAND:
+ evaltree(n->nbinary.ch1, EV_TESTED);
+ if (evalskip || exitstatus != 0)
+ goto out;
+ evaltree(n->nbinary.ch2, flags);
+ break;
+ case NOR:
+ evaltree(n->nbinary.ch1, EV_TESTED);
+ if (evalskip || exitstatus == 0)
+ goto out;
+ evaltree(n->nbinary.ch2, flags);
+ break;
+ case NREDIR:
+ expredir(n->nredir.redirect);
+ redirect(n->nredir.redirect, REDIR_PUSH);
+ evaltree(n->nredir.n, flags);
+ popredir();
+ break;
+ case NSUBSHELL:
+ evalsubshell(n, flags);
+ break;
+ case NBACKGND:
+ evalsubshell(n, flags);
+ break;
+ case NIF: {
+ evaltree(n->nif.test, EV_TESTED);
+ if (evalskip)
+ goto out;
+ if (exitstatus == 0)
+ evaltree(n->nif.ifpart, flags);
+ else if (n->nif.elsepart)
+ evaltree(n->nif.elsepart, flags);
+ else
+ exitstatus = 0;
+ break;
+ }
+ case NWHILE:
+ case NUNTIL:
+ evalloop(n, flags);
+ break;
+ case NFOR:
+ evalfor(n, flags);
+ break;
+ case NCASE:
+ evalcase(n, flags);
+ break;
+ case NDEFUN: {
+ struct builtincmd *bcmd;
+ if (
+ (bcmd = find_builtin(n->narg.text)) &&
+ bcmd->flags & BUILTIN_SPECIAL
+ ) {
+ outfmt(out2, "%s is a special built-in\n", n->narg.text);
+ exitstatus = 1;
+ break;
+ }
+ defun(n->narg.text, n->narg.next);
+ exitstatus = 0;
+ break;
+ }
+ case NNOT:
+ evaltree(n->nnot.com, EV_TESTED);
+ exitstatus = !exitstatus;
+ break;
+
+ case NPIPE:
+ evalpipe(n);
+ checkexit = 1;
+ break;
+ case NCMD:
+#ifdef notyet
+ evalcommand(n, flags, (struct backcmd *)NULL);
+#else
+ evalcommand(n, flags);
+#endif
+ checkexit = 1;
+ break;
+#ifdef DEBUG
+ default:
+ out1fmt("Node type = %d\n", n->type);
+#ifndef USE_GLIBC_STDIO
+ flushout(out1);
+#endif
+ break;
+#endif
+ }
+out:
+ if (pendingsigs)
+ dotrap();
+ if (
+ flags & EV_EXIT ||
+ (checkexit && eflag && exitstatus && !(flags & EV_TESTED))
+ )
+ exitshell(exitstatus);
+}
+
+
+static void
+evalloop(n, flags)
+ union node *n;
+ int flags;
+{
+ int status;
+
+ loopnest++;
+ status = 0;
+ for (;;) {
+ evaltree(n->nbinary.ch1, EV_TESTED);
+ if (evalskip) {
+skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
+ evalskip = 0;
+ continue;
+ }
+ if (evalskip == SKIPBREAK && --skipcount <= 0)
+ evalskip = 0;
+ break;
+ }
+ if (n->type == NWHILE) {
+ if (exitstatus != 0)
+ break;
+ } else {
+ if (exitstatus == 0)
+ break;
+ }
+ evaltree(n->nbinary.ch2, flags & EV_TESTED);
+ status = exitstatus;
+ if (evalskip)
+ goto skipping;
+ }
+ loopnest--;
+ exitstatus = status;
+}
+
+
+
+static void
+evalfor(n, flags)
+ union node *n;
+ int flags;
+{
+ struct arglist arglist;
+ union node *argp;
+ struct strlist *sp;
+ struct stackmark smark;
+
+ setstackmark(&smark);
+ arglist.lastp = &arglist.list;
+ for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
+ oexitstatus = exitstatus;
+ expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
+ if (evalskip)
+ goto out;
+ }
+ *arglist.lastp = NULL;
+
+ exitstatus = 0;
+ loopnest++;
+ for (sp = arglist.list ; sp ; sp = sp->next) {
+ setvar(n->nfor.var, sp->text, 0);
+ evaltree(n->nfor.body, flags & EV_TESTED);
+ if (evalskip) {
+ if (evalskip == SKIPCONT && --skipcount <= 0) {
+ evalskip = 0;
+ continue;
+ }
+ if (evalskip == SKIPBREAK && --skipcount <= 0)
+ evalskip = 0;
+ break;
+ }
+ }
+ loopnest--;
+out:
+ popstackmark(&smark);
+}
+
+
+
+static void
+evalcase(n, flags)
+ union node *n;
+ int flags;
+{
+ union node *cp;
+ union node *patp;
+ struct arglist arglist;
+ struct stackmark smark;
+
+ setstackmark(&smark);
+ arglist.lastp = &arglist.list;
+ oexitstatus = exitstatus;
+ expandarg(n->ncase.expr, &arglist, EXP_TILDE);
+ for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
+ for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {
+ if (casematch(patp, arglist.list->text)) {
+ if (evalskip == 0) {
+ evaltree(cp->nclist.body, flags);
+ }
+ goto out;
+ }
+ }
+ }
+out:
+ popstackmark(&smark);
+}
+
+
+
+/*
+ * Kick off a subshell to evaluate a tree.
+ */
+
+static void
+evalsubshell(n, flags)
+ union node *n;
+ int flags;
+{
+ struct job *jp;
+ int backgnd = (n->type == NBACKGND);
+
+ expredir(n->nredir.redirect);
+ jp = makejob(n, 1);
+ if (forkshell(jp, n, backgnd) == 0) {
+ if (backgnd)
+ flags &=~ EV_TESTED;
+ redirect(n->nredir.redirect, 0);
+ evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */
+ }
+ if (! backgnd) {
+ INTOFF;
+ exitstatus = waitforjob(jp);
+ INTON;
+ }
+}
+
+
+
+/*
+ * Compute the names of the files in a redirection list.
+ */
+
+static void
+expredir(n)
+ union node *n;
+{
+ union node *redir;
+
+ for (redir = n ; redir ; redir = redir->nfile.next) {
+ struct arglist fn;
+ fn.lastp = &fn.list;
+ oexitstatus = exitstatus;
+ switch (redir->type) {
+ case NFROMTO:
+ case NFROM:
+ case NTO:
+ case NAPPEND:
+ case NTOOV:
+ expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
+ redir->nfile.expfname = fn.list->text;
+ break;
+ case NFROMFD:
+ case NTOFD:
+ if (redir->ndup.vname) {
+ expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
+ fixredir(redir, fn.list->text, 1);
+ }
+ break;
+ }
+ }
+}
+
+
+
+/*
+ * Evaluate a pipeline. All the processes in the pipeline are children
+ * of the process creating the pipeline. (This differs from some versions
+ * of the shell, which make the last process in a pipeline the parent
+ * of all the rest.)
+ */
+
+static void
+evalpipe(n)
+ union node *n;
+{
+ struct job *jp;
+ struct nodelist *lp;
+ int pipelen;
+ int prevfd;
+ int pip[2];
+
+ TRACE(("evalpipe(0x%lx) called\n", (long)n));
+ pipelen = 0;
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
+ pipelen++;
+ INTOFF;
+ jp = makejob(n, pipelen);
+ prevfd = -1;
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
+ prehash(lp->n);
+ pip[1] = -1;
+ if (lp->next) {
+ if (pipe(pip) < 0) {
+ close(prevfd);
+ error("Pipe call failed");
+ }
+ }
+ if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
+ INTON;
+ if (prevfd > 0) {
+ close(0);
+ dup_as_newfd(prevfd, 0);
+ close(prevfd);
+ if (pip[0] == 0) {
+ pip[0] = -1;
+ }
+ }
+ if (pip[1] >= 0) {
+ if (pip[0] >= 0) {
+ close(pip[0]);
+ }
+ if (pip[1] != 1) {
+ close(1);
+ dup_as_newfd(pip[1], 1);
+ close(pip[1]);
+ }
+ }
+ evaltree(lp->n, EV_EXIT);
+ }
+ if (prevfd >= 0)
+ close(prevfd);
+ prevfd = pip[0];
+ close(pip[1]);
+ }
+ INTON;
+ if (n->npipe.backgnd == 0) {
+ INTOFF;
+ exitstatus = waitforjob(jp);
+ TRACE(("evalpipe: job done exit status %d\n", exitstatus));
+ INTON;
+ }
+}
+
+
+
+/*
+ * Execute a command inside back quotes. If it's a builtin command, we
+ * want to save its output in a block obtained from malloc. Otherwise
+ * we fork off a subprocess and get the output of the command via a pipe.
+ * Should be called with interrupts off.
+ */
+
+static void
+evalbackcmd(n, result)
+ union node *n;
+ struct backcmd *result;
+{
+ int pip[2];
+ struct job *jp;
+ struct stackmark smark; /* unnecessary */
+
+ setstackmark(&smark);
+ result->fd = -1;
+ result->buf = NULL;
+ result->nleft = 0;
+ result->jp = NULL;
+ if (n == NULL) {
+ exitstatus = 0;
+ goto out;
+ }
+#ifdef notyet
+ /*
+ * For now we disable executing builtins in the same
+ * context as the shell, because we are not keeping
+ * enough state to recover from changes that are
+ * supposed only to affect subshells. eg. echo "`cd /`"
+ */
+ if (n->type == NCMD) {
+ exitstatus = oexitstatus;
+ evalcommand(n, EV_BACKCMD, result);
+ } else
+#endif
+ {
+ exitstatus = 0;
+ if (pipe(pip) < 0)
+ error("Pipe call failed");
+ jp = makejob(n, 1);
+ if (forkshell(jp, n, FORK_NOJOB) == 0) {
+ FORCEINTON;
+ close(pip[0]);
+ if (pip[1] != 1) {
+ close(1);
+ dup_as_newfd(pip[1], 1);
+ close(pip[1]);
+ }
+ eflag = 0;
+ evaltree(n, EV_EXIT);
+ }
+ close(pip[1]);
+ result->fd = pip[0];
+ result->jp = jp;
+ }
+out:
+ popstackmark(&smark);
+ TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
+ result->fd, result->buf, result->nleft, result->jp));
+}
+
+
+
+/*
+ * Execute a simple command.
+ */
+
+static void
+#ifdef notyet
+evalcommand(cmd, flags, backcmd)
+ union node *cmd;
+ int flags;
+ struct backcmd *backcmd;
+#else
+evalcommand(cmd, flags)
+ union node *cmd;
+ int flags;
+#endif
+{
+ struct stackmark smark;
+ union node *argp;
+ struct arglist arglist;
+ struct arglist varlist;
+ char **argv;
+ int argc;
+ char **envp;
+ struct strlist *sp;
+ int mode;
+#ifdef notyet
+ int pip[2];
+#endif
+ struct cmdentry cmdentry;
+ struct job *jp;
+ char *volatile savecmdname;
+ volatile struct shparam saveparam;
+ struct localvar *volatile savelocalvars;
+ volatile int e;
+ char *lastarg;
+ const char *path;
+ const struct builtincmd *firstbltin;
+ struct jmploc *volatile savehandler;
+ struct jmploc jmploc;
+#if __GNUC__
+ /* Avoid longjmp clobbering */
+ (void) &argv;
+ (void) &argc;
+ (void) &lastarg;
+ (void) &flags;
+#endif
+
+ /* First expand the arguments. */
+ TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
+ setstackmark(&smark);
+ arglist.lastp = &arglist.list;
+ varlist.lastp = &varlist.list;
+ arglist.list = 0;
+ oexitstatus = exitstatus;
+ exitstatus = 0;
+ path = pathval();
+ for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
+ expandarg(argp, &varlist, EXP_VARTILDE);
+ }
+ for (
+ argp = cmd->ncmd.args; argp && !arglist.list;
+ argp = argp->narg.next
+ ) {
+ expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
+ }
+ if (argp) {
+ struct builtincmd *bcmd;
+ bool pseudovarflag;
+ bcmd = find_builtin(arglist.list->text);
+ pseudovarflag = bcmd && bcmd->flags & BUILTIN_ASSIGN;
+ for (; argp; argp = argp->narg.next) {
+ if (pseudovarflag && isassignment(argp->narg.text)) {
+ expandarg(argp, &arglist, EXP_VARTILDE);
+ continue;
+ }
+ expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
+ }
+ }
+ *arglist.lastp = NULL;
+ *varlist.lastp = NULL;
+ expredir(cmd->ncmd.redirect);
+ argc = 0;
+ for (sp = arglist.list ; sp ; sp = sp->next)
+ argc++;
+ argv = stalloc(sizeof (char *) * (argc + 1));
+
+ for (sp = arglist.list ; sp ; sp = sp->next) {
+ TRACE(("evalcommand arg: %s\n", sp->text));
+ *argv++ = sp->text;
+ }
+ *argv = NULL;
+ lastarg = NULL;
+ if (iflag && funcnest == 0 && argc > 0)
+ lastarg = argv[-1];
+ argv -= argc;
+
+ /* Print the command if xflag is set. */
+ if (xflag) {
+#ifdef FLUSHERR
+ outc('+', &errout);
+#else
+ outcslow('+', &errout);
+#endif
+ eprintlist(varlist.list);
+ eprintlist(arglist.list);
+#ifdef FLUSHERR
+ outc('\n', &errout);
+ flushout(&errout);
+#else
+ outcslow('\n', &errout);
+#endif
+ }
+
+ /* Now locate the command. */
+ if (argc == 0) {
+ cmdentry.cmdtype = CMDBUILTIN;
+ firstbltin = cmdentry.u.cmd = BLTINCMD;
+ } else {
+ const char *oldpath;
+ int findflag = DO_ERR;
+ int oldfindflag;
+
+ /*
+ * Modify the command lookup path, if a PATH= assignment
+ * is present
+ */
+ for (sp = varlist.list ; sp ; sp = sp->next)
+ if (varequal(sp->text, defpathvar)) {
+ path = sp->text + 5;
+ findflag |= DO_BRUTE;
+ }
+ oldpath = path;
+ oldfindflag = findflag;
+ firstbltin = 0;
+ for(;;) {
+ find_command(argv[0], &cmdentry, findflag, path);
+ if (cmdentry.cmdtype == CMDUNKNOWN) { /* command not found */
+ exitstatus = 127;
+#ifdef FLUSHERR
+ flushout(&errout);
+#endif
+ goto out;
+ }
+ /* implement bltin and command here */
+ if (cmdentry.cmdtype != CMDBUILTIN) {
+ break;
+ }
+ if (!firstbltin) {
+ firstbltin = cmdentry.u.cmd;
+ }
+ if (cmdentry.u.cmd == BLTINCMD) {
+ for(;;) {
+ struct builtincmd *bcmd;
+
+ argv++;
+ if (--argc == 0)
+ goto found;
+ if (!(bcmd = find_builtin(*argv))) {
+ outfmt(&errout, "%s: not found\n", *argv);
+ exitstatus = 127;
+#ifdef FLUSHERR
+ flushout(&errout);
+#endif
+ goto out;
+ }
+ cmdentry.u.cmd = bcmd;
+ if (bcmd != BLTINCMD)
+ break;
+ }
+ }
+ if (cmdentry.u.cmd == COMMANDCMD) {
+ argv++;
+ if (--argc == 0) {
+ goto found;
+ }
+ if (*argv[0] == '-') {
+ if (!equal(argv[0], "-p")) {
+ argv--;
+ argc++;
+ break;
+ }
+ argv++;
+ if (--argc == 0) {
+ goto found;
+ }
+ path = defpath;
+ findflag |= DO_BRUTE;
+ } else {
+ path = oldpath;
+ findflag = oldfindflag;
+ }
+ findflag |= DO_NOFUN;
+ continue;
+ }
+found:
+ break;
+ }
+ }
+
+ /* Fork off a child process if necessary. */
+ if (cmd->ncmd.backgnd
+ || (cmdentry.cmdtype == CMDNORMAL && (flags & EV_EXIT) == 0)
+#ifdef notyet
+ || ((flags & EV_BACKCMD) != 0
+ && (cmdentry.cmdtype != CMDBUILTIN
+ || cmdentry.u.bcmd == DOTCMD
+ || cmdentry.u.bcmd == EVALCMD))
+#endif
+ ) {
+ jp = makejob(cmd, 1);
+ mode = cmd->ncmd.backgnd;
+#ifdef notyet
+ if (flags & EV_BACKCMD) {
+ mode = FORK_NOJOB;
+ if (pipe(pip) < 0)
+ error("Pipe call failed");
+ }
+#endif
+ if (forkshell(jp, cmd, mode) != 0)
+ goto parent; /* at end of routine */
+#ifdef notyet
+ if (flags & EV_BACKCMD) {
+ FORCEINTON;
+ close(pip[0]);
+ if (pip[1] != 1) {
+ close(1);
+ dup_as_newfd(pip[1], 1);
+ close(pip[1]);
+ }
+ }
+#endif
+ flags |= EV_EXIT;
+ }
+
+ /* This is the child process if a fork occurred. */
+ /* Execute the command. */
+ if (cmdentry.cmdtype == CMDFUNCTION) {
+#ifdef DEBUG
+ trputs("Shell function: "); trargs(argv);
+#endif
+ exitstatus = oexitstatus;
+ redirect(cmd->ncmd.redirect, REDIR_PUSH);
+ saveparam = shellparam;
+ shellparam.malloc = 0;
+ shellparam.nparam = argc - 1;
+ shellparam.p = argv + 1;
+ INTOFF;
+ savelocalvars = localvars;
+ localvars = NULL;
+ INTON;
+ if (setjmp(jmploc.loc)) {
+ if (exception == EXSHELLPROC) {
+ freeparam((volatile struct shparam *)
+ &saveparam);
+ } else {
+ saveparam.optind = shellparam.optind;
+ saveparam.optoff = shellparam.optoff;
+ freeparam(&shellparam);
+ shellparam = saveparam;
+ }
+ poplocalvars();
+ localvars = savelocalvars;
+ handler = savehandler;
+ longjmp(handler->loc, 1);
+ }
+ savehandler = handler;
+ handler = &jmploc;
+ for (sp = varlist.list ; sp ; sp = sp->next)
+ mklocal(sp->text);
+ funcnest++;
+ evaltree(cmdentry.u.func, flags & EV_TESTED);
+ funcnest--;
+ INTOFF;
+ poplocalvars();
+ localvars = savelocalvars;
+ saveparam.optind = shellparam.optind;
+ saveparam.optoff = shellparam.optoff;
+ freeparam(&shellparam);
+ shellparam = saveparam;
+ handler = savehandler;
+ popredir();
+ INTON;
+ if (evalskip == SKIPFUNC) {
+ evalskip = 0;
+ skipcount = 0;
+ }
+ if (flags & EV_EXIT)
+ exitshell(exitstatus);
+ } else if (cmdentry.cmdtype == CMDBUILTIN) {
+#ifdef DEBUG
+ trputs("builtin command: "); trargs(argv);
+#endif
+ mode = (cmdentry.u.cmd == EXECCMD)? 0 : REDIR_PUSH;
+#ifdef notyet
+ if (flags == EV_BACKCMD) {
+#ifdef USE_GLIBC_STDIO
+ openmemout();
+#else
+ memout.nleft = 0;
+ memout.nextc = memout.buf;
+ memout.bufsize = 64;
+#endif
+ mode |= REDIR_BACKQ;
+ }
+#endif
+ redirect(cmd->ncmd.redirect, mode);
+ savecmdname = commandname;
+ if (firstbltin->flags & BUILTIN_SPECIAL) {
+ listsetvar(varlist.list);
+ } else {
+ cmdenviron = varlist.list;
+ }
+ e = -1;
+ if (setjmp(jmploc.loc)) {
+ e = exception;
+ exitstatus = (e == EXINT)? SIGINT+128 : 2;
+ goto cmddone;
+ }
+ savehandler = handler;
+ handler = &jmploc;
+ commandname = argv[0];
+ argptr = argv + 1;
+ optptr = NULL; /* initialize nextopt */
+ exitstatus = (*cmdentry.u.cmd->builtinfunc)(argc, argv);
+ flushall();
+cmddone:
+ exitstatus |= outerr(out1);
+ out1 = &output;
+ out2 = &errout;
+ freestdout();
+ cmdenviron = NULL;
+ if (e != EXSHELLPROC) {
+ commandname = savecmdname;
+ if (flags & EV_EXIT)
+ exitshell(exitstatus);
+ }
+ handler = savehandler;
+ if (e != -1) {
+ if ((e != EXERROR && e != EXEXEC)
+ || cmdentry.u.cmd == BLTINCMD
+ || cmdentry.u.cmd == DOTCMD
+ || cmdentry.u.cmd == EVALCMD
+ || cmdentry.u.cmd == EXECCMD)
+ exraise(e);
+ FORCEINTON;
+ }
+ if (cmdentry.u.cmd != EXECCMD)
+ popredir();
+#ifdef notyet
+ if (flags == EV_BACKCMD) {
+ INTOFF;
+#ifdef USE_GLIBC_STDIO
+ if (__closememout()) {
+ error(
+ "__closememout() failed: %s",
+ strerror(errno)
+ );
+ }
+#endif
+ backcmd->buf = memout.buf;
+#ifdef USE_GLIBC_STDIO
+ backcmd->nleft = memout.bufsize;
+#else
+ backcmd->nleft = memout.nextc - memout.buf;
+#endif
+ memout.buf = NULL;
+ INTON;
+ }
+#endif
+ } else {
+#ifdef DEBUG
+ trputs("normal command: "); trargs(argv);
+#endif
+ redirect(cmd->ncmd.redirect, 0);
+ clearredir();
+ for (sp = varlist.list ; sp ; sp = sp->next)
+ setvareq(sp->text, VEXPORT|VSTACK);
+ envp = environment();
+ shellexec(argv, envp, path, cmdentry.u.index);
+ }
+ goto out;
+
+parent: /* parent process gets here (if we forked) */
+ if (mode == 0) { /* argument to fork */
+ INTOFF;
+ exitstatus = waitforjob(jp);
+ INTON;
+#ifdef notyet
+ } else if (mode == 2) {
+ backcmd->fd = pip[0];
+ close(pip[1]);
+ backcmd->jp = jp;
+#endif
+ }
+
+out:
+ if (lastarg)
+ setvar("_", lastarg, 0);
+ popstackmark(&smark);
+}
+
+
+
+/*
+ * Search for a command. This is called before we fork so that the
+ * location of the command will be available in the parent as well as
+ * the child. The check for "goodname" is an overly conservative
+ * check that the name will not be subject to expansion.
+ */
+
+static void
+prehash(n)
+ union node *n;
+{
+ struct cmdentry entry;
+
+ if (n->type == NCMD && n->ncmd.args)
+ if (goodname(n->ncmd.args->narg.text))
+ find_command(n->ncmd.args->narg.text, &entry, 0,
+ pathval());
+}
+
+
+
+/*
+ * Builtin commands. Builtin commands whose functions are closely
+ * tied to evaluation are implemented here.
+ */
+
+/*
+ * No command given, or a bltin command with no arguments. Set the
+ * specified variables.
+ */
+
+int
+bltincmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ /*
+ * Preserve exitstatus of a previous possible redirection
+ * as POSIX mandates
+ */
+ return exitstatus;
+}
+
+
+/*
+ * Handle break and continue commands. Break, continue, and return are
+ * all handled by setting the evalskip flag. The evaluation routines
+ * above all check this flag, and if it is set they start skipping
+ * commands rather than executing them. The variable skipcount is
+ * the number of loops to break/continue, or the number of function
+ * levels to return. (The latter is always 1.) It should probably
+ * be an error to break out of more loops than exist, but it isn't
+ * in the standard shell so we don't make it one here.
+ */
+
+static int
+breakcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int n = argc > 1 ? number(argv[1]) : 1;
+
+ if (n > loopnest)
+ n = loopnest;
+ if (n > 0) {
+ evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
+ skipcount = n;
+ }
+ return 0;
+}
+
+
+/*
+ * The return command.
+ */
+
+static int
+returncmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int ret = argc > 1 ? number(argv[1]) : oexitstatus;
+
+ if (funcnest) {
+ evalskip = SKIPFUNC;
+ skipcount = 1;
+ return ret;
+ }
+ else {
+ /* Do what ksh does; skip the rest of the file */
+ evalskip = SKIPFILE;
+ skipcount = 1;
+ return ret;
+ }
+}
+
+
+#ifndef BB_TRUE_FALSE
+static int
+false_main(argc, argv)
+ int argc;
+ char **argv;
+{
+ return 1;
+}
+
+
+static int
+true_main(argc, argv)
+ int argc;
+ char **argv;
+{
+ return 0;
+}
+#endif
+
+static int
+execcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ if (argc > 1) {
+ struct strlist *sp;
+
+ iflag = 0; /* exit on error */
+ mflag = 0;
+ optschanged();
+ for (sp = cmdenviron; sp ; sp = sp->next)
+ setvareq(sp->text, VEXPORT|VSTACK);
+ shellexec(argv + 1, environment(), pathval(), 0);
+ }
+ return 0;
+}
+
+static void
+eprintlist(struct strlist *sp)
+{
+ for (; sp; sp = sp->next) {
+ outfmt(&errout, " %s",sp->text);
+ }
+}
+/* $NetBSD: exec.c,v 1.32 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * When commands are first encountered, they are entered in a hash table.
+ * This ensures that a full path search will not have to be done for them
+ * on each invocation.
+ *
+ * We should investigate converting to a linear search, even though that
+ * would make the command name "hash" a misnomer.
+ */
+#define CMDTABLESIZE 31 /* should be prime */
+#define ARB 1 /* actual size determined at run time */
+
+
+
+struct tblentry {
+ struct tblentry *next; /* next entry in hash chain */
+ union param param; /* definition of builtin function */
+ short cmdtype; /* index identifying command */
+ char rehash; /* if set, cd done since entry created */
+ char cmdname[ARB]; /* name of command */
+};
+
+
+static struct tblentry *cmdtable[CMDTABLESIZE];
+static int builtinloc = -1; /* index in path of %builtin, or -1 */
+static int exerrno = 0; /* Last exec error */
+
+
+static void tryexec __P((char *, char **, char **));
+#if !defined(BSD) && !defined(linux)
+static void execinterp __P((char **, char **));
+#endif
+static void printentry __P((struct tblentry *, int));
+static void clearcmdentry __P((int));
+static struct tblentry *cmdlookup __P((char *, int));
+static void delete_cmd_entry __P((void));
+#ifdef ASH_TYPE
+static int describe_command __P((char *, int));
+#endif
+static int path_change __P((const char *, int *));
+
+
+/*
+ * Exec a program. Never returns. If you change this routine, you may
+ * have to change the find_command routine as well.
+ */
+
+static void
+shellexec(argv, envp, path, idx)
+ char **argv, **envp;
+ const char *path;
+ int idx;
+{
+ char *cmdname;
+ int e;
+
+ if (strchr(argv[0], '/') != NULL) {
+ tryexec(argv[0], argv, envp);
+ e = errno;
+ } else {
+ e = ENOENT;
+ while ((cmdname = padvance(&path, argv[0])) != NULL) {
+ if (--idx < 0 && pathopt == NULL) {
+ tryexec(cmdname, argv, envp);
+ if (errno != ENOENT && errno != ENOTDIR)
+ e = errno;
+ }
+ stunalloc(cmdname);
+ }
+ }
+
+ /* Map to POSIX errors */
+ switch (e) {
+ case EACCES:
+ exerrno = 126;
+ break;
+ case ENOENT:
+ exerrno = 127;
+ break;
+ default:
+ exerrno = 2;
+ break;
+ }
+ exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
+ /* NOTREACHED */
+}
+
+
+static void
+tryexec(cmd, argv, envp)
+ char *cmd;
+ char **argv;
+ char **envp;
+ {
+ int e;
+#if !defined(BSD) && !defined(linux)
+ char *p;
+#endif
+
+#ifdef SYSV
+ do {
+ execve(cmd, argv, envp);
+ } while (errno == EINTR);
+#else
+ execve(cmd, argv, envp);
+#endif
+ e = errno;
+ if (e == ENOEXEC) {
+ INTOFF;
+ initshellproc();
+ setinputfile(cmd, 0);
+ commandname = arg0 = savestr(argv[0]);
+#if !defined(BSD) && !defined(linux)
+ INTON;
+ pgetc(); pungetc(); /* fill up input buffer */
+ p = parsenextc;
+ if (parsenleft > 2 && p[0] == '#' && p[1] == '!') {
+ argv[0] = cmd;
+ execinterp(argv, envp);
+ }
+ INTOFF;
+#endif
+ setparam(argv + 1);
+ exraise(EXSHELLPROC);
+ }
+ errno = e;
+}
+
+
+#if !defined(BSD) && !defined(linux)
+/*
+ * Execute an interpreter introduced by "#!", for systems where this
+ * feature has not been built into the kernel. If the interpreter is
+ * the shell, return (effectively ignoring the "#!"). If the execution
+ * of the interpreter fails, exit.
+ *
+ * This code peeks inside the input buffer in order to avoid actually
+ * reading any input. It would benefit from a rewrite.
+ */
+
+#define NEWARGS 5
+
+static void
+execinterp(argv, envp)
+ char **argv, **envp;
+ {
+ int n;
+ char *inp;
+ char *outp;
+ char c;
+ char *p;
+ char **ap;
+ char *newargs[NEWARGS];
+ int i;
+ char **ap2;
+ char **new;
+
+ n = parsenleft - 2;
+ inp = parsenextc + 2;
+ ap = newargs;
+ for (;;) {
+ while (--n >= 0 && (*inp == ' ' || *inp == '\t'))
+ inp++;
+ if (n < 0)
+ goto bad;
+ if ((c = *inp++) == '\n')
+ break;
+ if (ap == &newargs[NEWARGS])
+bad: error("Bad #! line");
+ STARTSTACKSTR(outp);
+ do {
+ STPUTC(c, outp);
+ } while (--n >= 0 && (c = *inp++) != ' ' && c != '\t' && c != '\n');
+ STPUTC('\0', outp);
+ n++, inp--;
+ *ap++ = grabstackstr(outp);
+ }
+ if (ap == newargs + 1) { /* if no args, maybe no exec is needed */
+ p = newargs[0];
+ for (;;) {
+ if (equal(p, "sh") || equal(p, "ash")) {
+ return;
+ }
+ while (*p != '/') {
+ if (*p == '\0')
+ goto break2;
+ p++;
+ }
+ p++;
+ }
+break2:;
+ }
+ i = (char *)ap - (char *)newargs; /* size in bytes */
+ if (i == 0)
+ error("Bad #! line");
+ for (ap2 = argv ; *ap2++ != NULL ; );
+ new = ckmalloc(i + ((char *)ap2 - (char *)argv));
+ ap = newargs, ap2 = new;
+ while ((i -= sizeof (char **)) >= 0)
+ *ap2++ = *ap++;
+ ap = argv;
+ while (*ap2++ = *ap++);
+ shellexec(new, envp, pathval(), 0);
+ /* NOTREACHED */
+}
+#endif
+
+
+
+/*
+ * Do a path search. The variable path (passed by reference) should be
+ * set to the start of the path before the first call; padvance will update
+ * this value as it proceeds. Successive calls to padvance will return
+ * the possible path expansions in sequence. If an option (indicated by
+ * a percent sign) appears in the path entry then the global variable
+ * pathopt will be set to point to it; otherwise pathopt will be set to
+ * NULL.
+ */
+
+static const char *pathopt;
+
+static char *
+padvance(path, name)
+ const char **path;
+ const char *name;
+ {
+ const char *p;
+ char *q;
+ const char *start;
+ int len;
+
+ if (*path == NULL)
+ return NULL;
+ start = *path;
+ for (p = start ; *p && *p != ':' && *p != '%' ; p++);
+ len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
+ while (stackblocksize() < len)
+ growstackblock();
+ q = stackblock();
+ if (p != start) {
+ memcpy(q, start, p - start);
+ q += p - start;
+ *q++ = '/';
+ }
+ strcpy(q, name);
+ pathopt = NULL;
+ if (*p == '%') {
+ pathopt = ++p;
+ while (*p && *p != ':') p++;
+ }
+ if (*p == ':')
+ *path = p + 1;
+ else
+ *path = NULL;
+ return stalloc(len);
+}
+
+
+
+/*** Command hashing code ***/
+
+
+static int
+hashcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+ int c;
+ int verbose;
+ struct cmdentry entry;
+ char *name;
+
+ verbose = 0;
+ while ((c = nextopt("rv")) != '\0') {
+ if (c == 'r') {
+ clearcmdentry(0);
+ return 0;
+ } else if (c == 'v') {
+ verbose++;
+ }
+ }
+ if (*argptr == NULL) {
+ for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
+ for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+ if (cmdp->cmdtype != CMDBUILTIN) {
+ printentry(cmdp, verbose);
+ }
+ }
+ }
+ return 0;
+ }
+ c = 0;
+ while ((name = *argptr) != NULL) {
+ if ((cmdp = cmdlookup(name, 0)) != NULL
+ && (cmdp->cmdtype == CMDNORMAL
+ || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
+ delete_cmd_entry();
+ find_command(name, &entry, DO_ERR, pathval());
+ if (entry.cmdtype == CMDUNKNOWN) c = 1;
+ else if (verbose) {
+ cmdp = cmdlookup(name, 0);
+ if (cmdp) printentry(cmdp, verbose);
+ flushall();
+ }
+ argptr++;
+ }
+ return c;
+}
+
+
+static void
+printentry(cmdp, verbose)
+ struct tblentry *cmdp;
+ int verbose;
+ {
+ int idx;
+ const char *path;
+ char *name;
+
+ if (cmdp->cmdtype == CMDNORMAL) {
+ idx = cmdp->param.index;
+ path = pathval();
+ do {
+ name = padvance(&path, cmdp->cmdname);
+ stunalloc(name);
+ } while (--idx >= 0);
+ out1str(name);
+ } else if (cmdp->cmdtype == CMDBUILTIN) {
+ out1fmt("builtin %s", cmdp->cmdname);
+ } else if (cmdp->cmdtype == CMDFUNCTION) {
+ out1fmt("function %s", cmdp->cmdname);
+ if (verbose) {
+ INTOFF;
+ name = commandtext(cmdp->param.func);
+ out1fmt(" %s", name);
+ ckfree(name);
+ INTON;
+ }
+#ifdef DEBUG
+ } else {
+ error("internal error: cmdtype %d", cmdp->cmdtype);
+#endif
+ }
+ out1fmt(snlfmt, cmdp->rehash ? "*" : nullstr);
+}
+
+
+
+/*
+ * Resolve a command name. If you change this routine, you may have to
+ * change the shellexec routine as well.
+ */
+
+static void
+find_command(name, entry, act, path)
+ char *name;
+ struct cmdentry *entry;
+ int act;
+ const char *path;
+{
+ struct tblentry *cmdp;
+ int idx;
+ int prev;
+ char *fullname;
+ struct stat statb;
+ int e;
+ int bltin;
+ int firstchange;
+ int updatetbl;
+ bool regular;
+ struct builtincmd *bcmd;
+
+ /* If name contains a slash, don't use the hash table */
+ if (strchr(name, '/') != NULL) {
+ if (act & DO_ABS) {
+ while (stat(name, &statb) < 0) {
+ #ifdef SYSV
+ if (errno == EINTR)
+ continue;
+ #endif
+ if (errno != ENOENT && errno != ENOTDIR)
+ e = errno;
+ entry->cmdtype = CMDUNKNOWN;
+ entry->u.index = -1;
+ return;
+ }
+ entry->cmdtype = CMDNORMAL;
+ entry->u.index = -1;
+ return;
+ }
+ entry->cmdtype = CMDNORMAL;
+ entry->u.index = 0;
+ return;
+ }
+
+ updatetbl = 1;
+ if (act & DO_BRUTE) {
+ firstchange = path_change(path, &bltin);
+ } else {
+ bltin = builtinloc;
+ firstchange = 9999;
+ }
+
+ /* If name is in the table, and not invalidated by cd, we're done */
+ if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0) {
+ if (cmdp->cmdtype == CMDFUNCTION) {
+ if (act & DO_NOFUN) {
+ updatetbl = 0;
+ } else {
+ goto success;
+ }
+ } else if (act & DO_BRUTE) {
+ if ((cmdp->cmdtype == CMDNORMAL &&
+ cmdp->param.index >= firstchange) ||
+ (cmdp->cmdtype == CMDBUILTIN &&
+ ((builtinloc < 0 && bltin >= 0) ?
+ bltin : builtinloc) >= firstchange)) {
+ /* need to recompute the entry */
+ } else {
+ goto success;
+ }
+ } else {
+ goto success;
+ }
+ }
+
+ bcmd = find_builtin(name);
+ regular = bcmd && bcmd->flags & BUILTIN_REGULAR;
+
+ if (regular) {
+ if (cmdp && (cmdp->cmdtype == CMDBUILTIN)) {
+ goto success;
+ }
+ } else if (act & DO_BRUTE) {
+ if (firstchange == 0) {
+ updatetbl = 0;
+ }
+ }
+
+ /* If %builtin not in path, check for builtin next */
+ if (regular || (bltin < 0 && bcmd)) {
+builtin:
+ if (!updatetbl) {
+ entry->cmdtype = CMDBUILTIN;
+ entry->u.cmd = bcmd;
+ return;
+ }
+ INTOFF;
+ cmdp = cmdlookup(name, 1);
+ cmdp->cmdtype = CMDBUILTIN;
+ cmdp->param.cmd = bcmd;
+ INTON;
+ goto success;
+ }
+
+ /* We have to search path. */
+ prev = -1; /* where to start */
+ if (cmdp && cmdp->rehash) { /* doing a rehash */
+ if (cmdp->cmdtype == CMDBUILTIN)
+ prev = builtinloc;
+ else
+ prev = cmdp->param.index;
+ }
+
+ e = ENOENT;
+ idx = -1;
+loop:
+ while ((fullname = padvance(&path, name)) != NULL) {
+ stunalloc(fullname);
+ idx++;
+ if (idx >= firstchange) {
+ updatetbl = 0;
+ }
+ if (pathopt) {
+ if (prefix("builtin", pathopt)) {
+ if ((bcmd = find_builtin(name))) {
+ goto builtin;
+ }
+ continue;
+ } else if (!(act & DO_NOFUN) &&
+ prefix("func", pathopt)) {
+ /* handled below */
+ } else {
+ continue; /* ignore unimplemented options */
+ }
+ }
+ /* if rehash, don't redo absolute path names */
+ if (fullname[0] == '/' && idx <= prev &&
+ idx < firstchange) {
+ if (idx < prev)
+ continue;
+ TRACE(("searchexec \"%s\": no change\n", name));
+ goto success;
+ }
+ while (stat(fullname, &statb) < 0) {
+#ifdef SYSV
+ if (errno == EINTR)
+ continue;
+#endif
+ if (errno != ENOENT && errno != ENOTDIR)
+ e = errno;
+ goto loop;
+ }
+ e = EACCES; /* if we fail, this will be the error */
+ if (!S_ISREG(statb.st_mode))
+ continue;
+ if (pathopt) { /* this is a %func directory */
+ stalloc(strlen(fullname) + 1);
+ readcmdfile(fullname);
+ if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
+ error("%s not defined in %s", name, fullname);
+ stunalloc(fullname);
+ goto success;
+ }
+#ifdef notdef
+ if (statb.st_uid == geteuid()) {
+ if ((statb.st_mode & 0100) == 0)
+ goto loop;
+ } else if (statb.st_gid == getegid()) {
+ if ((statb.st_mode & 010) == 0)
+ goto loop;
+ } else {
+ if ((statb.st_mode & 01) == 0)
+ goto loop;
+ }
+#endif
+ TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
+ /* If we aren't called with DO_BRUTE and cmdp is set, it must
+ be a function and we're being called with DO_NOFUN */
+ if (!updatetbl) {
+ entry->cmdtype = CMDNORMAL;
+ entry->u.index = idx;
+ return;
+ }
+ INTOFF;
+ cmdp = cmdlookup(name, 1);
+ cmdp->cmdtype = CMDNORMAL;
+ cmdp->param.index = idx;
+ INTON;
+ goto success;
+ }
+
+ /* We failed. If there was an entry for this command, delete it */
+ if (cmdp && updatetbl)
+ delete_cmd_entry();
+ if (act & DO_ERR)
+ outfmt(out2, "%s: %s\n", name, errmsg(e, E_EXEC));
+ entry->cmdtype = CMDUNKNOWN;
+ return;
+
+success:
+ cmdp->rehash = 0;
+ entry->cmdtype = cmdp->cmdtype;
+ entry->u = cmdp->param;
+}
+
+
+
+/*
+ * Search the table of builtin commands.
+ */
+
+struct builtincmd *
+find_builtin(name)
+ char *name;
+{
+ struct builtincmd *bp;
+
+ bp = bsearch( &name, builtincmds, NUMBUILTINS, sizeof(struct builtincmd),
+ pstrcmp
+ );
+ return bp;
+}
+
+
+/*
+ * Called when a cd is done. Marks all commands so the next time they
+ * are executed they will be rehashed.
+ */
+
+static void
+hashcd() {
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+
+ for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
+ for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+ if (cmdp->cmdtype == CMDNORMAL
+ || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
+ cmdp->rehash = 1;
+ }
+ }
+}
+
+
+
+/*
+ * Called before PATH is changed. The argument is the new value of PATH;
+ * pathval() still returns the old value at this point. Called with
+ * interrupts off.
+ */
+
+static void
+changepath(newval)
+ const char *newval;
+{
+ int firstchange;
+ int bltin;
+
+ firstchange = path_change(newval, &bltin);
+ if (builtinloc < 0 && bltin >= 0)
+ builtinloc = bltin; /* zap builtins */
+ clearcmdentry(firstchange);
+ builtinloc = bltin;
+}
+
+
+/*
+ * Clear out command entries. The argument specifies the first entry in
+ * PATH which has changed.
+ */
+
+static void
+clearcmdentry(firstchange)
+ int firstchange;
+{
+ struct tblentry **tblp;
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+
+ INTOFF;
+ for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
+ pp = tblp;
+ while ((cmdp = *pp) != NULL) {
+ if ((cmdp->cmdtype == CMDNORMAL &&
+ cmdp->param.index >= firstchange)
+ || (cmdp->cmdtype == CMDBUILTIN &&
+ builtinloc >= firstchange)) {
+ *pp = cmdp->next;
+ ckfree(cmdp);
+ } else {
+ pp = &cmdp->next;
+ }
+ }
+ }
+ INTON;
+}
+
+
+/*
+ * Delete all functions.
+ */
+
+#ifdef mkinit
+static void deletefuncs __P((void));
+
+SHELLPROC {
+ deletefuncs();
+}
+#endif
+
+static void
+deletefuncs() {
+ struct tblentry **tblp;
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+
+ INTOFF;
+ for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
+ pp = tblp;
+ while ((cmdp = *pp) != NULL) {
+ if (cmdp->cmdtype == CMDFUNCTION) {
+ *pp = cmdp->next;
+ freefunc(cmdp->param.func);
+ ckfree(cmdp);
+ } else {
+ pp = &cmdp->next;
+ }
+ }
+ }
+ INTON;
+}
+
+
+
+/*
+ * Locate a command in the command hash table. If "add" is nonzero,
+ * add the command to the table if it is not already present. The
+ * variable "lastcmdentry" is set to point to the address of the link
+ * pointing to the entry, so that delete_cmd_entry can delete the
+ * entry.
+ */
+
+struct tblentry **lastcmdentry;
+
+
+static struct tblentry *
+cmdlookup(name, add)
+ char *name;
+ int add;
+{
+ int hashval;
+ char *p;
+ struct tblentry *cmdp;
+ struct tblentry **pp;
+
+ p = name;
+ hashval = *p << 4;
+ while (*p)
+ hashval += *p++;
+ hashval &= 0x7FFF;
+ pp = &cmdtable[hashval % CMDTABLESIZE];
+ for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+ if (equal(cmdp->cmdname, name))
+ break;
+ pp = &cmdp->next;
+ }
+ if (add && cmdp == NULL) {
+ INTOFF;
+ cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
+ + strlen(name) + 1);
+ cmdp->next = NULL;
+ cmdp->cmdtype = CMDUNKNOWN;
+ cmdp->rehash = 0;
+ strcpy(cmdp->cmdname, name);
+ INTON;
+ }
+ lastcmdentry = pp;
+ return cmdp;
+}
+
+/*
+ * Delete the command entry returned on the last lookup.
+ */
+
+static void
+delete_cmd_entry() {
+ struct tblentry *cmdp;
+
+ INTOFF;
+ cmdp = *lastcmdentry;
+ *lastcmdentry = cmdp->next;
+ ckfree(cmdp);
+ INTON;
+}
+
+
+
+#ifdef notdef
+static void
+getcmdentry(name, entry)
+ char *name;
+ struct cmdentry *entry;
+ {
+ struct tblentry *cmdp = cmdlookup(name, 0);
+
+ if (cmdp) {
+ entry->u = cmdp->param;
+ entry->cmdtype = cmdp->cmdtype;
+ } else {
+ entry->cmdtype = CMDUNKNOWN;
+ entry->u.index = 0;
+ }
+}
+#endif
+
+
+/*
+ * Add a new command entry, replacing any existing command entry for
+ * the same name.
+ */
+
+static void
+addcmdentry(name, entry)
+ char *name;
+ struct cmdentry *entry;
+ {
+ struct tblentry *cmdp;
+
+ INTOFF;
+ cmdp = cmdlookup(name, 1);
+ if (cmdp->cmdtype == CMDFUNCTION) {
+ freefunc(cmdp->param.func);
+ }
+ cmdp->cmdtype = entry->cmdtype;
+ cmdp->param = entry->u;
+ INTON;
+}
+
+
+/*
+ * Define a shell function.
+ */
+
+static void
+defun(name, func)
+ char *name;
+ union node *func;
+ {
+ struct cmdentry entry;
+
+ entry.cmdtype = CMDFUNCTION;
+ entry.u.func = copyfunc(func);
+ addcmdentry(name, &entry);
+}
+
+
+/*
+ * Delete a function if it exists.
+ */
+
+static void
+unsetfunc(name)
+ char *name;
+ {
+ struct tblentry *cmdp;
+
+ if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
+ freefunc(cmdp->param.func);
+ delete_cmd_entry();
+ }
+}
+
+#ifdef ASH_TYPE
+/*
+ * Locate and print what a word is...
+ */
+
+static int
+typecmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int i;
+ int err = 0;
+
+ for (i = 1; i < argc; i++) {
+ err |= describe_command(argv[i], 1);
+ }
+ return err;
+}
+
+static int
+describe_command(command, verbose)
+ char *command;
+ int verbose;
+{
+ struct cmdentry entry;
+ struct tblentry *cmdp;
+ const struct alias *ap;
+ const char *path = pathval();
+
+ if (verbose) {
+ out1str(command);
+ }
+
+ /* First look at the keywords */
+ if (findkwd(command)) {
+ out1str(verbose ? " is a shell keyword" : command);
+ goto out;
+ }
+
+ /* Then look at the aliases */
+ if ((ap = lookupalias(command, 0)) != NULL) {
+ if (verbose) {
+ out1fmt(" is an alias for %s", ap->val);
+ } else {
+ printalias(ap);
+ }
+ goto out;
+ }
+
+ /* Then check if it is a tracked alias */
+ if ((cmdp = cmdlookup(command, 0)) != NULL) {
+ entry.cmdtype = cmdp->cmdtype;
+ entry.u = cmdp->param;
+ } else {
+ /* Finally use brute force */
+ find_command(command, &entry, DO_ABS, path);
+ }
+
+ switch (entry.cmdtype) {
+ case CMDNORMAL: {
+ int j = entry.u.index;
+ char *p;
+ if (j == -1) {
+ p = command;
+ } else {
+ do {
+ p = padvance(&path, command);
+ stunalloc(p);
+ } while (--j >= 0);
+ }
+ if (verbose) {
+ out1fmt(
+ " is%s %s",
+ cmdp ? " a tracked alias for" : nullstr, p
+ );
+ } else {
+ out1str(p);
+ }
+ break;
+ }
+
+ case CMDFUNCTION:
+ if (verbose) {
+ out1str(" is a shell function");
+ } else {
+ out1str(command);
+ }
+ break;
+
+ case CMDBUILTIN:
+ if (verbose) {
+ out1fmt(
+ " is a %sshell builtin",
+ entry.u.cmd->flags & BUILTIN_SPECIAL ?
+ "special " : nullstr
+ );
+ } else {
+ out1str(command);
+ }
+ break;
+
+ default:
+ if (verbose) {
+ out1str(": not found\n");
+ }
+ return 127;
+ }
+
+out:
+ out1c('\n');
+ return 0;
+}
+#endif
+
+static int
+commandcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int c;
+ int default_path = 0;
+ int verify_only = 0;
+ int verbose_verify_only = 0;
+
+ while ((c = nextopt("pvV")) != '\0')
+ switch (c) {
+ case 'p':
+ default_path = 1;
+ break;
+ case 'v':
+ verify_only = 1;
+ break;
+ case 'V':
+ verbose_verify_only = 1;
+ break;
+ default:
+ outfmt(out2,
+"command: nextopt returned character code 0%o\n", c);
+ return EX_SOFTWARE;
+ }
+
+ if (default_path + verify_only + verbose_verify_only > 1 ||
+ !*argptr) {
+ outfmt(out2,
+"command [-p] command [arg ...]\n");
+ outfmt(out2,
+"command {-v|-V} command\n");
+ return EX_USAGE;
+ }
+
+#ifdef ASH_TYPE
+ if (verify_only || verbose_verify_only) {
+ return describe_command(*argptr, verbose_verify_only);
+ }
+#endif
+
+ return 0;
+}
+
+static int
+path_change(newval, bltin)
+ const char *newval;
+ int *bltin;
+{
+ const char *old, *new;
+ int idx;
+ int firstchange;
+
+ old = pathval();
+ new = newval;
+ firstchange = 9999; /* assume no change */
+ idx = 0;
+ *bltin = -1;
+ for (;;) {
+ if (*old != *new) {
+ firstchange = idx;
+ if ((*old == '\0' && *new == ':')
+ || (*old == ':' && *new == '\0'))
+ firstchange++;
+ old = new; /* ignore subsequent differences */
+ }
+ if (*new == '\0')
+ break;
+ if (*new == '%' && *bltin < 0 && prefix("builtin", new + 1))
+ *bltin = idx;
+ if (*new == ':') {
+ idx++;
+ }
+ new++, old++;
+ }
+ if (builtinloc >= 0 && *bltin < 0)
+ firstchange = 0;
+ return firstchange;
+}
+/* $NetBSD: expand.c,v 1.50 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Routines to expand arguments to commands. We have to deal with
+ * backquotes, shell variables, and file metacharacters.
+ */
+/*
+ * _rmescape() flags
+ */
+#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
+#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
+
+/*
+ * Structure specifying which parts of the string should be searched
+ * for IFS characters.
+ */
+
+struct ifsregion {
+ struct ifsregion *next; /* next region in list */
+ int begoff; /* offset of start of region */
+ int endoff; /* offset of end of region */
+ int nulonly; /* search for nul bytes only */
+};
+
+
+static char *expdest; /* output of current string */
+struct nodelist *argbackq; /* list of back quote expressions */
+struct ifsregion ifsfirst; /* first struct in list of ifs regions */
+struct ifsregion *ifslastp; /* last struct in list */
+struct arglist exparg; /* holds expanded arg list */
+
+static void argstr __P((char *, int));
+static char *exptilde __P((char *, int));
+static void expbackq __P((union node *, int, int));
+static int subevalvar __P((char *, char *, int, int, int, int, int));
+static char *evalvar __P((char *, int));
+static int varisset __P((char *, int));
+static void strtodest __P((const char *, const char *, int));
+static void varvalue __P((char *, int, int));
+static void recordregion __P((int, int, int));
+static void removerecordregions __P((int));
+static void ifsbreakup __P((char *, struct arglist *));
+static void ifsfree __P((void));
+static void expandmeta __P((struct strlist *, int));
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN)
+#define preglob(p) _rmescapes((p), RMESCAPE_ALLOC | RMESCAPE_GLOB)
+#if !defined(GLOB_BROKEN)
+static void addglob __P((const glob_t *));
+#endif
+#endif
+#if !(defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
+static void expmeta __P((char *, char *));
+#endif
+static void addfname __P((char *));
+#if !(defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
+static struct strlist *expsort __P((struct strlist *));
+static struct strlist *msort __P((struct strlist *, int));
+#endif
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN)
+static int patmatch __P((char *, char *, int));
+static int patmatch2 __P((char *, char *, int));
+#else
+static int pmatch __P((char *, char *, int));
+#define patmatch2 patmatch
+#endif
+static char *cvtnum __P((int, char *));
+
+extern int oexitstatus;
+
+/*
+ * Expand shell variables and backquotes inside a here document.
+ */
+
+static void
+expandhere(arg, fd)
+ union node *arg; /* the document */
+ int fd; /* where to write the expanded version */
+ {
+ herefd = fd;
+ expandarg(arg, (struct arglist *)NULL, 0);
+ xwrite(fd, stackblock(), expdest - stackblock());
+}
+
+
+/*
+ * Perform variable substitution and command substitution on an argument,
+ * placing the resulting list of arguments in arglist. If EXP_FULL is true,
+ * perform splitting and file name expansion. When arglist is NULL, perform
+ * here document expansion.
+ */
+
+static void
+expandarg(arg, arglist, flag)
+ union node *arg;
+ struct arglist *arglist;
+ int flag;
+{
+ struct strlist *sp;
+ char *p;
+
+ argbackq = arg->narg.backquote;
+ STARTSTACKSTR(expdest);
+ ifsfirst.next = NULL;
+ ifslastp = NULL;
+ argstr(arg->narg.text, flag);
+ if (arglist == NULL) {
+ return; /* here document expanded */
+ }
+ STPUTC('\0', expdest);
+ p = grabstackstr(expdest);
+ exparg.lastp = &exparg.list;
+ /*
+ * TODO - EXP_REDIR
+ */
+ if (flag & EXP_FULL) {
+ ifsbreakup(p, &exparg);
+ *exparg.lastp = NULL;
+ exparg.lastp = &exparg.list;
+ expandmeta(exparg.list, flag);
+ } else {
+ if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
+ rmescapes(p);
+ sp = (struct strlist *)stalloc(sizeof (struct strlist));
+ sp->text = p;
+ *exparg.lastp = sp;
+ exparg.lastp = &sp->next;
+ }
+ ifsfree();
+ *exparg.lastp = NULL;
+ if (exparg.list) {
+ *arglist->lastp = exparg.list;
+ arglist->lastp = exparg.lastp;
+ }
+}
+
+
+
+/*
+ * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
+ * characters to allow for further processing. Otherwise treat
+ * $@ like $* since no splitting will be performed.
+ */
+
+static void
+argstr(p, flag)
+ char *p;
+ int flag;
+{
+ char c;
+ int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
+ int firsteq = 1;
+
+ if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
+ p = exptilde(p, flag);
+ for (;;) {
+ switch (c = *p++) {
+ case '\0':
+ case CTLENDVAR: /* ??? */
+ goto breakloop;
+ case CTLQUOTEMARK:
+ /* "$@" syntax adherence hack */
+ if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
+ break;
+ if ((flag & EXP_FULL) != 0)
+ STPUTC(c, expdest);
+ break;
+ case CTLESC:
+ if (quotes)
+ STPUTC(c, expdest);
+ c = *p++;
+ STPUTC(c, expdest);
+ break;
+ case CTLVAR:
+ p = evalvar(p, flag);
+ break;
+ case CTLBACKQ:
+ case CTLBACKQ|CTLQUOTE:
+ expbackq(argbackq->n, c & CTLQUOTE, flag);
+ argbackq = argbackq->next;
+ break;
+#ifdef ASH_MATH_SUPPORT
+ case CTLENDARI:
+ expari(flag);
+ break;
+#endif
+ case ':':
+ case '=':
+ /*
+ * sort of a hack - expand tildes in variable
+ * assignments (after the first '=' and after ':'s).
+ */
+ STPUTC(c, expdest);
+ if (flag & EXP_VARTILDE && *p == '~') {
+ if (c == '=') {
+ if (firsteq)
+ firsteq = 0;
+ else
+ break;
+ }
+ p = exptilde(p, flag);
+ }
+ break;
+ default:
+ STPUTC(c, expdest);
+ }
+ }
+breakloop:;
+ return;
+}
+
+static char *
+exptilde(p, flag)
+ char *p;
+ int flag;
+{
+ char c, *startp = p;
+ struct passwd *pw;
+ const char *home;
+ int quotes = flag & (EXP_FULL | EXP_CASE);
+
+ while ((c = *p) != '\0') {
+ switch(c) {
+ case CTLESC:
+ return (startp);
+ case CTLQUOTEMARK:
+ return (startp);
+ case ':':
+ if (flag & EXP_VARTILDE)
+ goto done;
+ break;
+ case '/':
+ goto done;
+ }
+ p++;
+ }
+done:
+ *p = '\0';
+ if (*(startp+1) == '\0') {
+ if ((home = lookupvar("HOME")) == NULL)
+ goto lose;
+ } else {
+ if ((pw = getpwnam(startp+1)) == NULL)
+ goto lose;
+ home = pw->pw_dir;
+ }
+ if (*home == '\0')
+ goto lose;
+ *p = c;
+ strtodest(home, SQSYNTAX, quotes);
+ return (p);
+lose:
+ *p = c;
+ return (startp);
+}
+
+
+static void
+removerecordregions(endoff)
+ int endoff;
+{
+ if (ifslastp == NULL)
+ return;
+
+ if (ifsfirst.endoff > endoff) {
+ while (ifsfirst.next != NULL) {
+ struct ifsregion *ifsp;
+ INTOFF;
+ ifsp = ifsfirst.next->next;
+ ckfree(ifsfirst.next);
+ ifsfirst.next = ifsp;
+ INTON;
+ }
+ if (ifsfirst.begoff > endoff)
+ ifslastp = NULL;
+ else {
+ ifslastp = &ifsfirst;
+ ifsfirst.endoff = endoff;
+ }
+ return;
+ }
+
+ ifslastp = &ifsfirst;
+ while (ifslastp->next && ifslastp->next->begoff < endoff)
+ ifslastp=ifslastp->next;
+ while (ifslastp->next != NULL) {
+ struct ifsregion *ifsp;
+ INTOFF;
+ ifsp = ifslastp->next->next;
+ ckfree(ifslastp->next);
+ ifslastp->next = ifsp;
+ INTON;
+ }
+ if (ifslastp->endoff > endoff)
+ ifslastp->endoff = endoff;
+}
+
+
+#ifdef ASH_MATH_SUPPORT
+/*
+ * Expand arithmetic expression. Backup to start of expression,
+ * evaluate, place result in (backed up) result, adjust string position.
+ */
+static void
+expari(flag)
+ int flag;
+{
+ char *p, *start;
+ int result;
+ int begoff;
+ int quotes = flag & (EXP_FULL | EXP_CASE);
+ int quoted;
+
+ /* ifsfree(); */
+
+ /*
+ * This routine is slightly over-complicated for
+ * efficiency. First we make sure there is
+ * enough space for the result, which may be bigger
+ * than the expression if we add exponentation. Next we
+ * scan backwards looking for the start of arithmetic. If the
+ * next previous character is a CTLESC character, then we
+ * have to rescan starting from the beginning since CTLESC
+ * characters have to be processed left to right.
+ */
+ CHECKSTRSPACE(10, expdest);
+ USTPUTC('\0', expdest);
+ start = stackblock();
+ p = expdest - 1;
+ while (*p != CTLARI && p >= start)
+ --p;
+ if (*p != CTLARI)
+ error("missing CTLARI (shouldn't happen)");
+ if (p > start && *(p-1) == CTLESC)
+ for (p = start; *p != CTLARI; p++)
+ if (*p == CTLESC)
+ p++;
+
+ if (p[1] == '"')
+ quoted=1;
+ else
+ quoted=0;
+ begoff = p - start;
+ removerecordregions(begoff);
+ if (quotes)
+ rmescapes(p+2);
+ result = arith(p+2);
+ fmtstr(p, 12, "%d", result);
+
+ while (*p++)
+ ;
+
+ if (quoted == 0)
+ recordregion(begoff, p - 1 - start, 0);
+ result = expdest - p + 1;
+ STADJUST(-result, expdest);
+}
+#endif
+
+
+/*
+ * Expand stuff in backwards quotes.
+ */
+
+static void
+expbackq(cmd, quoted, flag)
+ union node *cmd;
+ int quoted;
+ int flag;
+{
+ volatile struct backcmd in;
+ int i;
+ char buf[128];
+ char *p;
+ char *dest = expdest;
+ volatile struct ifsregion saveifs;
+ struct ifsregion *volatile savelastp;
+ struct nodelist *volatile saveargbackq;
+ char lastc;
+ int startloc = dest - stackblock();
+ char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
+ volatile int saveherefd;
+ int quotes = flag & (EXP_FULL | EXP_CASE);
+ struct jmploc jmploc;
+ struct jmploc *volatile savehandler;
+ int ex;
+
+#if __GNUC__
+ /* Avoid longjmp clobbering */
+ (void) &dest;
+ (void) &syntax;
+#endif
+
+ in.fd = -1;
+ in.buf = 0;
+ in.jp = 0;
+
+ INTOFF;
+ saveifs = ifsfirst;
+ savelastp = ifslastp;
+ saveargbackq = argbackq;
+ saveherefd = herefd;
+ herefd = -1;
+ if ((ex = setjmp(jmploc.loc))) {
+ goto err1;
+ }
+ savehandler = handler;
+ handler = &jmploc;
+ INTON;
+ p = grabstackstr(dest);
+ evalbackcmd(cmd, (struct backcmd *) &in);
+ ungrabstackstr(p, dest);
+err1:
+ INTOFF;
+ ifsfirst = saveifs;
+ ifslastp = savelastp;
+ argbackq = saveargbackq;
+ herefd = saveherefd;
+ if (ex) {
+ goto err2;
+ }
+
+ p = in.buf;
+ lastc = '\0';
+ for (;;) {
+ if (--in.nleft < 0) {
+ if (in.fd < 0)
+ break;
+ while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
+ TRACE(("expbackq: read returns %d\n", i));
+ if (i <= 0)
+ break;
+ p = buf;
+ in.nleft = i - 1;
+ }
+ lastc = *p++;
+ if (lastc != '\0') {
+ if (quotes && syntax[(int)lastc] == CCTL)
+ STPUTC(CTLESC, dest);
+ STPUTC(lastc, dest);
+ }
+ }
+
+ /* Eat all trailing newlines */
+ for (; dest > stackblock() && dest[-1] == '\n';)
+ STUNPUTC(dest);
+
+err2:
+ if (in.fd >= 0)
+ close(in.fd);
+ if (in.buf)
+ ckfree(in.buf);
+ if (in.jp)
+ exitstatus = waitforjob(in.jp);
+ handler = savehandler;
+ if (ex) {
+ longjmp(handler->loc, 1);
+ }
+ if (quoted == 0)
+ recordregion(startloc, dest - stackblock(), 0);
+ TRACE(("evalbackq: size=%d: \"%.*s\"\n",
+ (dest - stackblock()) - startloc,
+ (dest - stackblock()) - startloc,
+ stackblock() + startloc));
+ expdest = dest;
+ INTON;
+}
+
+
+
+static int
+subevalvar(p, str, strloc, subtype, startloc, varflags, quotes)
+ char *p;
+ char *str;
+ int strloc;
+ int subtype;
+ int startloc;
+ int varflags;
+ int quotes;
+{
+ char *startp;
+ char *loc = NULL;
+ char *q;
+ int c = 0;
+ int saveherefd = herefd;
+ struct nodelist *saveargbackq = argbackq;
+ int amount;
+
+ herefd = -1;
+ argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0);
+ STACKSTRNUL(expdest);
+ herefd = saveherefd;
+ argbackq = saveargbackq;
+ startp = stackblock() + startloc;
+ if (str == NULL)
+ str = stackblock() + strloc;
+
+ switch (subtype) {
+ case VSASSIGN:
+ setvar(str, startp, 0);
+ amount = startp - expdest;
+ STADJUST(amount, expdest);
+ varflags &= ~VSNUL;
+ if (c != 0)
+ *loc = c;
+ return 1;
+
+ case VSQUESTION:
+ if (*p != CTLENDVAR) {
+ outfmt(&errout, snlfmt, startp);
+ error((char *)NULL);
+ }
+ error("%.*s: parameter %snot set", p - str - 1,
+ str, (varflags & VSNUL) ? "null or "
+ : nullstr);
+ /* NOTREACHED */
+
+ case VSTRIMLEFT:
+ for (loc = startp; loc < str; loc++) {
+ c = *loc;
+ *loc = '\0';
+ if (patmatch2(str, startp, quotes))
+ goto recordleft;
+ *loc = c;
+ if (quotes && *loc == CTLESC)
+ loc++;
+ }
+ return 0;
+
+ case VSTRIMLEFTMAX:
+ for (loc = str - 1; loc >= startp;) {
+ c = *loc;
+ *loc = '\0';
+ if (patmatch2(str, startp, quotes))
+ goto recordleft;
+ *loc = c;
+ loc--;
+ if (quotes && loc > startp && *(loc - 1) == CTLESC) {
+ for (q = startp; q < loc; q++)
+ if (*q == CTLESC)
+ q++;
+ if (q > loc)
+ loc--;
+ }
+ }
+ return 0;
+
+ case VSTRIMRIGHT:
+ for (loc = str - 1; loc >= startp;) {
+ if (patmatch2(str, loc, quotes))
+ goto recordright;
+ loc--;
+ if (quotes && loc > startp && *(loc - 1) == CTLESC) {
+ for (q = startp; q < loc; q++)
+ if (*q == CTLESC)
+ q++;
+ if (q > loc)
+ loc--;
+ }
+ }
+ return 0;
+
+ case VSTRIMRIGHTMAX:
+ for (loc = startp; loc < str - 1; loc++) {
+ if (patmatch2(str, loc, quotes))
+ goto recordright;
+ if (quotes && *loc == CTLESC)
+ loc++;
+ }
+ return 0;
+
+#ifdef DEBUG
+ default:
+ abort();
+#endif
+ }
+
+recordleft:
+ *loc = c;
+ amount = ((str - 1) - (loc - startp)) - expdest;
+ STADJUST(amount, expdest);
+ while (loc != str - 1)
+ *startp++ = *loc++;
+ return 1;
+
+recordright:
+ amount = loc - expdest;
+ STADJUST(amount, expdest);
+ STPUTC('\0', expdest);
+ STADJUST(-1, expdest);
+ return 1;
+}
+
+
+/*
+ * Expand a variable, and return a pointer to the next character in the
+ * input string.
+ */
+
+static char *
+evalvar(p, flag)
+ char *p;
+ int flag;
+{
+ int subtype;
+ int varflags;
+ char *var;
+ char *val;
+ int patloc;
+ int c;
+ int set;
+ int special;
+ int startloc;
+ int varlen;
+ int easy;
+ int quotes = flag & (EXP_FULL | EXP_CASE);
+
+ varflags = *p++;
+ subtype = varflags & VSTYPE;
+ var = p;
+ special = 0;
+ if (! is_name(*p))
+ special = 1;
+ p = strchr(p, '=') + 1;
+again: /* jump here after setting a variable with ${var=text} */
+ if (special) {
+ set = varisset(var, varflags & VSNUL);
+ val = NULL;
+ } else {
+ val = lookupvar(var);
+ if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
+ val = NULL;
+ set = 0;
+ } else
+ set = 1;
+ }
+ varlen = 0;
+ startloc = expdest - stackblock();
+ if (set && subtype != VSPLUS) {
+ /* insert the value of the variable */
+ if (special) {
+ varvalue(var, varflags & VSQUOTE, flag);
+ if (subtype == VSLENGTH) {
+ varlen = expdest - stackblock() - startloc;
+ STADJUST(-varlen, expdest);
+ }
+ } else {
+ if (subtype == VSLENGTH) {
+ varlen = strlen(val);
+ } else {
+ strtodest(
+ val,
+ varflags & VSQUOTE ?
+ DQSYNTAX : BASESYNTAX,
+ quotes
+ );
+ }
+ }
+ }
+
+ if (subtype == VSPLUS)
+ set = ! set;
+
+ easy = ((varflags & VSQUOTE) == 0 ||
+ (*var == '@' && shellparam.nparam != 1));
+
+
+ switch (subtype) {
+ case VSLENGTH:
+ expdest = cvtnum(varlen, expdest);
+ goto record;
+
+ case VSNORMAL:
+ if (!easy)
+ break;
+record:
+ recordregion(startloc, expdest - stackblock(),
+ varflags & VSQUOTE);
+ break;
+
+ case VSPLUS:
+ case VSMINUS:
+ if (!set) {
+ argstr(p, flag);
+ break;
+ }
+ if (easy)
+ goto record;
+ break;
+
+ case VSTRIMLEFT:
+ case VSTRIMLEFTMAX:
+ case VSTRIMRIGHT:
+ case VSTRIMRIGHTMAX:
+ if (!set)
+ break;
+ /*
+ * Terminate the string and start recording the pattern
+ * right after it
+ */
+ STPUTC('\0', expdest);
+ patloc = expdest - stackblock();
+ if (subevalvar(p, NULL, patloc, subtype,
+ startloc, varflags, quotes) == 0) {
+ int amount = (expdest - stackblock() - patloc) + 1;
+ STADJUST(-amount, expdest);
+ }
+ /* Remove any recorded regions beyond start of variable */
+ removerecordregions(startloc);
+ goto record;
+
+ case VSASSIGN:
+ case VSQUESTION:
+ if (!set) {
+ if (subevalvar(p, var, 0, subtype, startloc,
+ varflags, quotes)) {
+ varflags &= ~VSNUL;
+ /*
+ * Remove any recorded regions beyond
+ * start of variable
+ */
+ removerecordregions(startloc);
+ goto again;
+ }
+ break;
+ }
+ if (easy)
+ goto record;
+ break;
+
+#ifdef DEBUG
+ default:
+ abort();
+#endif
+ }
+
+ if (subtype != VSNORMAL) { /* skip to end of alternative */
+ int nesting = 1;
+ for (;;) {
+ if ((c = *p++) == CTLESC)
+ p++;
+ else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
+ if (set)
+ argbackq = argbackq->next;
+ } else if (c == CTLVAR) {
+ if ((*p++ & VSTYPE) != VSNORMAL)
+ nesting++;
+ } else if (c == CTLENDVAR) {
+ if (--nesting == 0)
+ break;
+ }
+ }
+ }
+ return p;
+}
+
+
+
+/*
+ * Test whether a specialized variable is set.
+ */
+
+static int
+varisset(name, nulok)
+ char *name;
+ int nulok;
+{
+ if (*name == '!')
+ return backgndpid != -1;
+ else if (*name == '@' || *name == '*') {
+ if (*shellparam.p == NULL)
+ return 0;
+
+ if (nulok) {
+ char **av;
+
+ for (av = shellparam.p; *av; av++)
+ if (**av != '\0')
+ return 1;
+ return 0;
+ }
+ } else if (is_digit(*name)) {
+ char *ap;
+ int num = atoi(name);
+
+ if (num > shellparam.nparam)
+ return 0;
+
+ if (num == 0)
+ ap = arg0;
+ else
+ ap = shellparam.p[num - 1];
+
+ if (nulok && (ap == NULL || *ap == '\0'))
+ return 0;
+ }
+ return 1;
+}
+
+
+
+/*
+ * Put a string on the stack.
+ */
+
+static void
+strtodest(p, syntax, quotes)
+ const char *p;
+ const char *syntax;
+ int quotes;
+{
+ while (*p) {
+ if (quotes && syntax[(int) *p] == CCTL)
+ STPUTC(CTLESC, expdest);
+ STPUTC(*p++, expdest);
+ }
+}
+
+
+
+/*
+ * Add the value of a specialized variable to the stack string.
+ */
+
+static void
+varvalue(name, quoted, flags)
+ char *name;
+ int quoted;
+ int flags;
+{
+ int num;
+ char *p;
+ int i;
+ int sep;
+ int sepq = 0;
+ char **ap;
+ char const *syntax;
+ int allow_split = flags & EXP_FULL;
+ int quotes = flags & (EXP_FULL | EXP_CASE);
+
+ syntax = quoted ? DQSYNTAX : BASESYNTAX;
+ switch (*name) {
+ case '$':
+ num = rootpid;
+ goto numvar;
+ case '?':
+ num = oexitstatus;
+ goto numvar;
+ case '#':
+ num = shellparam.nparam;
+ goto numvar;
+ case '!':
+ num = backgndpid;
+numvar:
+ expdest = cvtnum(num, expdest);
+ break;
+ case '-':
+ for (i = 0 ; i < NOPTS ; i++) {
+ if (optlist[i].val)
+ STPUTC(optlist[i].letter, expdest);
+ }
+ break;
+ case '@':
+ if (allow_split && quoted) {
+ sep = 1 << CHAR_BIT;
+ goto param;
+ }
+ /* fall through */
+ case '*':
+ sep = ifsset() ? ifsval()[0] : ' ';
+ if (quotes) {
+ sepq = syntax[(int) sep] == CCTL;
+ }
+param:
+ for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
+ strtodest(p, syntax, quotes);
+ if (*ap && sep) {
+ if (sepq)
+ STPUTC(CTLESC, expdest);
+ STPUTC(sep, expdest);
+ }
+ }
+ break;
+ case '0':
+ strtodest(arg0, syntax, quotes);
+ break;
+ default:
+ num = atoi(name);
+ if (num > 0 && num <= shellparam.nparam) {
+ strtodest(shellparam.p[num - 1], syntax, quotes);
+ }
+ break;
+ }
+}
+
+
+
+/*
+ * Record the fact that we have to scan this region of the
+ * string for IFS characters.
+ */
+
+static void
+recordregion(start, end, nulonly)
+ int start;
+ int end;
+ int nulonly;
+{
+ struct ifsregion *ifsp;
+
+ if (ifslastp == NULL) {
+ ifsp = &ifsfirst;
+ } else {
+ INTOFF;
+ ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
+ ifsp->next = NULL;
+ ifslastp->next = ifsp;
+ INTON;
+ }
+ ifslastp = ifsp;
+ ifslastp->begoff = start;
+ ifslastp->endoff = end;
+ ifslastp->nulonly = nulonly;
+}
+
+
+
+/*
+ * Break the argument string into pieces based upon IFS and add the
+ * strings to the argument list. The regions of the string to be
+ * searched for IFS characters have been stored by recordregion.
+ */
+static void
+ifsbreakup(string, arglist)
+ char *string;
+ struct arglist *arglist;
+ {
+ struct ifsregion *ifsp;
+ struct strlist *sp;
+ char *start;
+ char *p;
+ char *q;
+ const char *ifs, *realifs;
+ int ifsspc;
+ int nulonly;
+
+
+ start = string;
+ ifsspc = 0;
+ nulonly = 0;
+ realifs = ifsset() ? ifsval() : defifs;
+ if (ifslastp != NULL) {
+ ifsp = &ifsfirst;
+ do {
+ p = string + ifsp->begoff;
+ nulonly = ifsp->nulonly;
+ ifs = nulonly ? nullstr : realifs;
+ ifsspc = 0;
+ while (p < string + ifsp->endoff) {
+ q = p;
+ if (*p == CTLESC)
+ p++;
+ if (strchr(ifs, *p)) {
+ if (!nulonly)
+ ifsspc = (strchr(defifs, *p) != NULL);
+ /* Ignore IFS whitespace at start */
+ if (q == start && ifsspc) {
+ p++;
+ start = p;
+ continue;
+ }
+ *q = '\0';
+ sp = (struct strlist *)stalloc(sizeof *sp);
+ sp->text = start;
+ *arglist->lastp = sp;
+ arglist->lastp = &sp->next;
+ p++;
+ if (!nulonly) {
+ for (;;) {
+ if (p >= string + ifsp->endoff) {
+ break;
+ }
+ q = p;
+ if (*p == CTLESC)
+ p++;
+ if (strchr(ifs, *p) == NULL ) {
+ p = q;
+ break;
+ } else if (strchr(defifs, *p) == NULL) {
+ if (ifsspc) {
+ p++;
+ ifsspc = 0;
+ } else {
+ p = q;
+ break;
+ }
+ } else
+ p++;
+ }
+ }
+ start = p;
+ } else
+ p++;
+ }
+ } while ((ifsp = ifsp->next) != NULL);
+ if (!(*start || (!ifsspc && start > string && nulonly))) {
+ return;
+ }
+ }
+
+ sp = (struct strlist *)stalloc(sizeof *sp);
+ sp->text = start;
+ *arglist->lastp = sp;
+ arglist->lastp = &sp->next;
+}
+
+static void
+ifsfree()
+{
+ while (ifsfirst.next != NULL) {
+ struct ifsregion *ifsp;
+ INTOFF;
+ ifsp = ifsfirst.next->next;
+ ckfree(ifsfirst.next);
+ ifsfirst.next = ifsp;
+ INTON;
+ }
+ ifslastp = NULL;
+ ifsfirst.next = NULL;
+}
+
+
+
+/*
+ * Expand shell metacharacters. At this point, the only control characters
+ * should be escapes. The results are stored in the list exparg.
+ */
+
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN)
+static void
+expandmeta(str, flag)
+ struct strlist *str;
+ int flag;
+{
+ const char *p;
+ glob_t pglob;
+ /* TODO - EXP_REDIR */
+
+ while (str) {
+ if (fflag)
+ goto nometa;
+ p = preglob(str->text);
+ INTOFF;
+ switch (glob(p, GLOB_NOMAGIC, 0, &pglob)) {
+ case 0:
+ if (!(pglob.gl_flags & GLOB_MAGCHAR))
+ goto nometa2;
+ addglob(&pglob);
+ globfree(&pglob);
+ INTON;
+ break;
+ case GLOB_NOMATCH:
+nometa2:
+ globfree(&pglob);
+ INTON;
+nometa:
+ *exparg.lastp = str;
+ rmescapes(str->text);
+ exparg.lastp = &str->next;
+ break;
+ default: /* GLOB_NOSPACE */
+ error("Out of space");
+ }
+ str = str->next;
+ }
+}
+
+
+/*
+ * Add the result of glob(3) to the list.
+ */
+
+static void
+addglob(pglob)
+ const glob_t *pglob;
+{
+ char **p = pglob->gl_pathv;
+
+ do {
+ addfname(*p);
+ } while (*++p);
+}
+
+
+#else /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
+static char *expdir;
+
+
+static void
+expandmeta(str, flag)
+ struct strlist *str;
+ int flag;
+{
+ char *p;
+ struct strlist **savelastp;
+ struct strlist *sp;
+ char c;
+ /* TODO - EXP_REDIR */
+
+ while (str) {
+ if (fflag)
+ goto nometa;
+ p = str->text;
+ for (;;) { /* fast check for meta chars */
+ if ((c = *p++) == '\0')
+ goto nometa;
+ if (c == '*' || c == '?' || c == '[' || c == '!')
+ break;
+ }
+ savelastp = exparg.lastp;
+ INTOFF;
+ if (expdir == NULL) {
+ int i = strlen(str->text);
+ expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
+ }
+
+ expmeta(expdir, str->text);
+ ckfree(expdir);
+ expdir = NULL;
+ INTON;
+ if (exparg.lastp == savelastp) {
+ /*
+ * no matches
+ */
+nometa:
+ *exparg.lastp = str;
+ rmescapes(str->text);
+ exparg.lastp = &str->next;
+ } else {
+ *exparg.lastp = NULL;
+ *savelastp = sp = expsort(*savelastp);
+ while (sp->next != NULL)
+ sp = sp->next;
+ exparg.lastp = &sp->next;
+ }
+ str = str->next;
+ }
+}
+
+
+/*
+ * Do metacharacter (i.e. *, ?, [...]) expansion.
+ */
+
+static void
+expmeta(enddir, name)
+ char *enddir;
+ char *name;
+ {
+ char *p;
+ const char *cp;
+ char *q;
+ char *start;
+ char *endname;
+ int metaflag;
+ struct stat statb;
+ DIR *dirp;
+ struct dirent *dp;
+ int atend;
+ int matchdot;
+
+ metaflag = 0;
+ start = name;
+ for (p = name ; ; p++) {
+ if (*p == '*' || *p == '?')
+ metaflag = 1;
+ else if (*p == '[') {
+ q = p + 1;
+ if (*q == '!')
+ q++;
+ for (;;) {
+ while (*q == CTLQUOTEMARK)
+ q++;
+ if (*q == CTLESC)
+ q++;
+ if (*q == '/' || *q == '\0')
+ break;
+ if (*++q == ']') {
+ metaflag = 1;
+ break;
+ }
+ }
+ } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) {
+ metaflag = 1;
+ } else if (*p == '\0')
+ break;
+ else if (*p == CTLQUOTEMARK)
+ continue;
+ else if (*p == CTLESC)
+ p++;
+ if (*p == '/') {
+ if (metaflag)
+ break;
+ start = p + 1;
+ }
+ }
+ if (metaflag == 0) { /* we've reached the end of the file name */
+ if (enddir != expdir)
+ metaflag++;
+ for (p = name ; ; p++) {
+ if (*p == CTLQUOTEMARK)
+ continue;
+ if (*p == CTLESC)
+ p++;
+ *enddir++ = *p;
+ if (*p == '\0')
+ break;
+ }
+ if (metaflag == 0 || lstat(expdir, &statb) >= 0)
+ addfname(expdir);
+ return;
+ }
+ endname = p;
+ if (start != name) {
+ p = name;
+ while (p < start) {
+ while (*p == CTLQUOTEMARK)
+ p++;
+ if (*p == CTLESC)
+ p++;
+ *enddir++ = *p++;
+ }
+ }
+ if (enddir == expdir) {
+ cp = ".";
+ } else if (enddir == expdir + 1 && *expdir == '/') {
+ cp = "/";
+ } else {
+ cp = expdir;
+ enddir[-1] = '\0';
+ }
+ if ((dirp = opendir(cp)) == NULL)
+ return;
+ if (enddir != expdir)
+ enddir[-1] = '/';
+ if (*endname == 0) {
+ atend = 1;
+ } else {
+ atend = 0;
+ *endname++ = '\0';
+ }
+ matchdot = 0;
+ p = start;
+ while (*p == CTLQUOTEMARK)
+ p++;
+ if (*p == CTLESC)
+ p++;
+ if (*p == '.')
+ matchdot++;
+ while (! int_pending() && (dp = readdir(dirp)) != NULL) {
+ if (dp->d_name[0] == '.' && ! matchdot)
+ continue;
+ if (patmatch(start, dp->d_name, 0)) {
+ if (atend) {
+ scopy(dp->d_name, enddir);
+ addfname(expdir);
+ } else {
+ for (p = enddir, cp = dp->d_name;
+ (*p++ = *cp++) != '\0';)
+ continue;
+ p[-1] = '/';
+ expmeta(p, endname);
+ }
+ }
+ }
+ closedir(dirp);
+ if (! atend)
+ endname[-1] = '/';
+}
+#endif /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
+
+
+/*
+ * Add a file name to the list.
+ */
+
+static void
+addfname(name)
+ char *name;
+ {
+ char *p;
+ struct strlist *sp;
+
+ p = sstrdup(name);
+ sp = (struct strlist *)stalloc(sizeof *sp);
+ sp->text = p;
+ *exparg.lastp = sp;
+ exparg.lastp = &sp->next;
+}
+
+
+#if !(defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
+/*
+ * Sort the results of file name expansion. It calculates the number of
+ * strings to sort and then calls msort (short for merge sort) to do the
+ * work.
+ */
+
+static struct strlist *
+expsort(str)
+ struct strlist *str;
+ {
+ int len;
+ struct strlist *sp;
+
+ len = 0;
+ for (sp = str ; sp ; sp = sp->next)
+ len++;
+ return msort(str, len);
+}
+
+
+static struct strlist *
+msort(list, len)
+ struct strlist *list;
+ int len;
+{
+ struct strlist *p, *q = NULL;
+ struct strlist **lpp;
+ int half;
+ int n;
+
+ if (len <= 1)
+ return list;
+ half = len >> 1;
+ p = list;
+ for (n = half ; --n >= 0 ; ) {
+ q = p;
+ p = p->next;
+ }
+ q->next = NULL; /* terminate first half of list */
+ q = msort(list, half); /* sort first half of list */
+ p = msort(p, len - half); /* sort second half */
+ lpp = &list;
+ for (;;) {
+ if (strcmp(p->text, q->text) < 0) {
+ *lpp = p;
+ lpp = &p->next;
+ if ((p = *lpp) == NULL) {
+ *lpp = q;
+ break;
+ }
+ } else {
+ *lpp = q;
+ lpp = &q->next;
+ if ((q = *lpp) == NULL) {
+ *lpp = p;
+ break;
+ }
+ }
+ }
+ return list;
+}
+#endif
+
+
+
+/*
+ * Returns true if the pattern matches the string.
+ */
+
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN)
+static int
+patmatch(pattern, string, squoted)
+ char *pattern;
+ char *string;
+ int squoted; /* string might have quote chars */
+ {
+ const char *p;
+ char *q;
+
+ p = preglob(pattern);
+ q = squoted ? _rmescapes(string, RMESCAPE_ALLOC) : string;
+
+ return !fnmatch(p, q, 0);
+}
+
+
+static int
+patmatch2(pattern, string, squoted)
+ char *pattern;
+ char *string;
+ int squoted; /* string might have quote chars */
+ {
+ char *p;
+ int res;
+
+ sstrnleft--;
+ p = grabstackstr(expdest);
+ res = patmatch(pattern, string, squoted);
+ ungrabstackstr(p, expdest);
+ return res;
+}
+#else
+static int
+patmatch(pattern, string, squoted)
+ char *pattern;
+ char *string;
+ int squoted; /* string might have quote chars */
+ {
+#ifdef notdef
+ if (pattern[0] == '!' && pattern[1] == '!')
+ return 1 - pmatch(pattern + 2, string);
+ else
+#endif
+ return pmatch(pattern, string, squoted);
+}
+
+
+static int
+pmatch(pattern, string, squoted)
+ char *pattern;
+ char *string;
+ int squoted;
+ {
+ char *p, *q;
+ char c;
+
+ p = pattern;
+ q = string;
+ for (;;) {
+ switch (c = *p++) {
+ case '\0':
+ goto breakloop;
+ case CTLESC:
+ if (squoted && *q == CTLESC)
+ q++;
+ if (*q++ != *p++)
+ return 0;
+ break;
+ case CTLQUOTEMARK:
+ continue;
+ case '?':
+ if (squoted && *q == CTLESC)
+ q++;
+ if (*q++ == '\0')
+ return 0;
+ break;
+ case '*':
+ c = *p;
+ while (c == CTLQUOTEMARK || c == '*')
+ c = *++p;
+ if (c != CTLESC && c != CTLQUOTEMARK &&
+ c != '?' && c != '*' && c != '[') {
+ while (*q != c) {
+ if (squoted && *q == CTLESC &&
+ q[1] == c)
+ break;
+ if (*q == '\0')
+ return 0;
+ if (squoted && *q == CTLESC)
+ q++;
+ q++;
+ }
+ }
+ do {
+ if (pmatch(p, q, squoted))
+ return 1;
+ if (squoted && *q == CTLESC)
+ q++;
+ } while (*q++ != '\0');
+ return 0;
+ case '[': {
+ char *endp;
+ int invert, found;
+ char chr;
+
+ endp = p;
+ if (*endp == '!')
+ endp++;
+ for (;;) {
+ while (*endp == CTLQUOTEMARK)
+ endp++;
+ if (*endp == '\0')
+ goto dft; /* no matching ] */
+ if (*endp == CTLESC)
+ endp++;
+ if (*++endp == ']')
+ break;
+ }
+ invert = 0;
+ if (*p == '!') {
+ invert++;
+ p++;
+ }
+ found = 0;
+ chr = *q++;
+ if (squoted && chr == CTLESC)
+ chr = *q++;
+ if (chr == '\0')
+ return 0;
+ c = *p++;
+ do {
+ if (c == CTLQUOTEMARK)
+ continue;
+ if (c == CTLESC)
+ c = *p++;
+ if (*p == '-' && p[1] != ']') {
+ p++;
+ while (*p == CTLQUOTEMARK)
+ p++;
+ if (*p == CTLESC)
+ p++;
+ if (chr >= c && chr <= *p)
+ found = 1;
+ p++;
+ } else {
+ if (chr == c)
+ found = 1;
+ }
+ } while ((c = *p++) != ']');
+ if (found == invert)
+ return 0;
+ break;
+ }
+dft: default:
+ if (squoted && *q == CTLESC)
+ q++;
+ if (*q++ != c)
+ return 0;
+ break;
+ }
+ }
+breakloop:
+ if (*q != '\0')
+ return 0;
+ return 1;
+}
+#endif
+
+
+
+/*
+ * Remove any CTLESC characters from a string.
+ */
+
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN)
+static char *
+_rmescapes(str, flag)
+ char *str;
+ int flag;
+{
+ char *p, *q, *r;
+ static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 };
+
+ p = strpbrk(str, qchars);
+ if (!p) {
+ return str;
+ }
+ q = p;
+ r = str;
+ if (flag & RMESCAPE_ALLOC) {
+ size_t len = p - str;
+ q = r = stalloc(strlen(p) + len + 1);
+ if (len > 0) {
+#ifdef _GNU_SOURCE
+ q = mempcpy(q, str, len);
+#else
+ memcpy(q, str, len);
+ q += len;
+#endif
+ }
+ }
+ while (*p) {
+ if (*p == CTLQUOTEMARK) {
+ p++;
+ continue;
+ }
+ if (*p == CTLESC) {
+ p++;
+ if (flag & RMESCAPE_GLOB && *p != '/') {
+ *q++ = '\\';
+ }
+ }
+ *q++ = *p++;
+ }
+ *q = '\0';
+ return r;
+}
+#else
+static void
+rmescapes(str)
+ char *str;
+{
+ char *p, *q;
+
+ p = str;
+ while (*p != CTLESC && *p != CTLQUOTEMARK) {
+ if (*p++ == '\0')
+ return;
+ }
+ q = p;
+ while (*p) {
+ if (*p == CTLQUOTEMARK) {
+ p++;
+ continue;
+ }
+ if (*p == CTLESC)
+ p++;
+ *q++ = *p++;
+ }
+ *q = '\0';
+}
+#endif
+
+
+
+/*
+ * See if a pattern matches in a case statement.
+ */
+
+static int
+casematch(pattern, val)
+ union node *pattern;
+ char *val;
+ {
+ struct stackmark smark;
+ int result;
+ char *p;
+
+ setstackmark(&smark);
+ argbackq = pattern->narg.backquote;
+ STARTSTACKSTR(expdest);
+ ifslastp = NULL;
+ argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
+ STPUTC('\0', expdest);
+ p = grabstackstr(expdest);
+ result = patmatch(p, val, 0);
+ popstackmark(&smark);
+ return result;
+}
+
+/*
+ * Our own itoa().
+ */
+
+static char *
+cvtnum(num, buf)
+ int num;
+ char *buf;
+ {
+ int len;
+
+ CHECKSTRSPACE(32, buf);
+ len = sprintf(buf, "%d", num);
+ STADJUST(len, buf);
+ return buf;
+}
+/* $NetBSD: histedit.c,v 1.25 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Editline and history functions (and glue).
+ */
+static int histcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ error("not compiled with history support");
+ /* NOTREACHED */
+}
+
+
+/*
+ * This file was generated by the mkinit program.
+ */
+
+extern void rmaliases __P((void));
+
+extern int loopnest; /* current loop nesting level */
+
+extern void deletefuncs __P((void));
+
+struct strpush {
+ struct strpush *prev; /* preceding string on stack */
+ char *prevstring;
+ int prevnleft;
+ struct alias *ap; /* if push was associated with an alias */
+ char *string; /* remember the string since it may change */
+};
+
+struct parsefile {
+ struct parsefile *prev; /* preceding file on stack */
+ int linno; /* current line */
+ int fd; /* file descriptor (or -1 if string) */
+ int nleft; /* number of chars left in this line */
+ int lleft; /* number of chars left in this buffer */
+ char *nextc; /* next char in buffer */
+ char *buf; /* input buffer */
+ struct strpush *strpush; /* for pushing strings at this level */
+ struct strpush basestrpush; /* so pushing one is fast */
+};
+
+extern int parselleft; /* copy of parsefile->lleft */
+extern struct parsefile basepf; /* top level input file */
+extern char basebuf[BUFSIZ]; /* buffer for top level input file */
+
+extern short backgndpid; /* pid of last background process */
+extern int jobctl;
+
+extern int tokpushback; /* last token pushed back */
+extern int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
+
+struct redirtab {
+ struct redirtab *next;
+ short renamed[10];
+};
+
+extern struct redirtab *redirlist;
+
+extern char sigmode[NSIG - 1]; /* current value of signal */
+
+extern char **environ;
+
+
+
+/*
+ * Initialization code.
+ */
+
+static void
+init() {
+
+ /* from cd.c: */
+ {
+ setpwd(0, 0);
+ }
+
+ /* from input.c: */
+ {
+ basepf.nextc = basepf.buf = basebuf;
+ }
+
+ /* from output.c: */
+ {
+#ifdef USE_GLIBC_STDIO
+ initstreams();
+#endif
+ }
+
+ /* from var.c: */
+ {
+ char **envp;
+ char ppid[32];
+
+ initvar();
+ for (envp = environ ; *envp ; envp++) {
+ if (strchr(*envp, '=')) {
+ setvareq(*envp, VEXPORT|VTEXTFIXED);
+ }
+ }
+
+ fmtstr(ppid, sizeof(ppid), "%d", (int) getppid());
+ setvar("PPID", ppid, 0);
+ }
+}
+
+
+
+/*
+ * This routine is called when an error or an interrupt occurs in an
+ * interactive shell and control is returned to the main command loop.
+ */
+
+static void
+reset() {
+
+ /* from eval.c: */
+ {
+ evalskip = 0;
+ loopnest = 0;
+ funcnest = 0;
+ }
+
+ /* from input.c: */
+ {
+ if (exception != EXSHELLPROC)
+ parselleft = parsenleft = 0; /* clear input buffer */
+ popallfiles();
+ }
+
+ /* from parser.c: */
+ {
+ tokpushback = 0;
+ checkkwd = 0;
+ checkalias = 0;
+ }
+
+ /* from redir.c: */
+ {
+ while (redirlist)
+ popredir();
+ }
+
+ /* from output.c: */
+ {
+ out1 = &output;
+ out2 = &errout;
+#ifdef USE_GLIBC_STDIO
+ if (memout.stream != NULL)
+ __closememout();
+#endif
+ if (memout.buf != NULL) {
+ ckfree(memout.buf);
+ memout.buf = NULL;
+ }
+ }
+}
+
+
+
+/*
+ * This routine is called to initialize the shell to run a shell procedure.
+ */
+
+static void
+initshellproc() {
+
+ /* from alias.c: */
+ {
+ rmaliases();
+ }
+
+ /* from eval.c: */
+ {
+ exitstatus = 0;
+ }
+
+ /* from exec.c: */
+ {
+ deletefuncs();
+ }
+
+ /* from jobs.c: */
+ {
+ backgndpid = -1;
+#if JOBS
+ jobctl = 0;
+#endif
+ }
+
+ /* from options.c: */
+ {
+ int i;
+
+ for (i = 0; i < NOPTS; i++)
+ optlist[i].val = 0;
+ optschanged();
+
+ }
+
+ /* from redir.c: */
+ {
+ clearredir();
+ }
+
+ /* from trap.c: */
+ {
+ char *sm;
+
+ clear_traps();
+ for (sm = sigmode ; sm < sigmode + NSIG - 1; sm++) {
+ if (*sm == S_IGN)
+ *sm = S_HARD_IGN;
+ }
+ }
+
+ /* from var.c: */
+ {
+ shprocvar();
+ }
+}
+/* $NetBSD: input.c,v 1.35 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * This file implements the input routines used by the parser.
+ */
+
+#ifdef BB_FEATURE_COMMAND_EDITING
+unsigned int shell_context;
+static const char * cmdedit_prompt;
+static inline void putprompt(const char *s) {
+ cmdedit_prompt = s;
+}
+#else
+static inline void putprompt(const char *s) {
+ out2str(s);
+}
+#endif
+
+#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
+
+static int plinno = 1; /* input line number */
+static int parsenleft; /* copy of parsefile->nleft */
+static int parselleft; /* copy of parsefile->lleft */
+static char *parsenextc; /* copy of parsefile->nextc */
+struct parsefile basepf; /* top level input file */
+static char basebuf[BUFSIZ]; /* buffer for top level input file */
+struct parsefile *parsefile = &basepf; /* current input file */
+static int whichprompt; /* 1 == PS1, 2 == PS2 */
+
+static void pushfile __P((void));
+static int preadfd __P((void));
+
+#ifdef mkinit
+INCLUDE <stdio.h>
+INCLUDE "input.h"
+INCLUDE "error.h"
+
+INIT {
+ basepf.nextc = basepf.buf = basebuf;
+}
+
+RESET {
+ if (exception != EXSHELLPROC)
+ parselleft = parsenleft = 0; /* clear input buffer */
+ popallfiles();
+}
+#endif
+
+
+/*
+ * Read a line from the script.
+ */
+
+static char *
+pfgets(line, len)
+ char *line;
+ int len;
+{
+ char *p = line;
+ int nleft = len;
+ int c;
+
+ while (--nleft > 0) {
+ c = pgetc2();
+ if (c == PEOF) {
+ if (p == line)
+ return NULL;
+ break;
+ }
+ *p++ = c;
+ if (c == '\n')
+ break;
+ }
+ *p = '\0';
+ return line;
+}
+
+
+/*
+ * Read a character from the script, returning PEOF on end of file.
+ * Nul characters in the input are silently discarded.
+ */
+
+static int
+pgetc()
+{
+ return pgetc_macro();
+}
+
+
+/*
+ * Same as pgetc(), but ignores PEOA.
+ */
+
+static int
+pgetc2()
+{
+ int c;
+ do {
+ c = pgetc_macro();
+ } while (c == PEOA);
+ return c;
+}
+
+
+static int
+preadfd()
+{
+ int nr;
+ char *buf = parsefile->buf;
+ parsenextc = buf;
+
+retry:
+#ifdef BB_FEATURE_COMMAND_EDITING
+ {
+ if (parsefile->fd)
+ nr = read(parsefile->fd, buf, BUFSIZ - 1);
+ else {
+ do {
+ cmdedit_read_input((char*)cmdedit_prompt, buf);
+ nr = strlen(buf);
+ } while (nr <=0 || shell_context);
+ cmdedit_terminate();
+ }
+ }
+#else
+ nr = read(parsefile->fd, buf, BUFSIZ - 1);
+#endif
+
+ if (nr < 0) {
+ if (errno == EINTR)
+ goto retry;
+ if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
+ int flags = fcntl(0, F_GETFL, 0);
+ if (flags >= 0 && flags & O_NONBLOCK) {
+ flags &=~ O_NONBLOCK;
+ if (fcntl(0, F_SETFL, flags) >= 0) {
+ out2str("sh: turning off NDELAY mode\n");
+ goto retry;
+ }
+ }
+ }
+ }
+ return nr;
+}
+
+/*
+ * Refill the input buffer and return the next input character:
+ *
+ * 1) If a string was pushed back on the input, pop it;
+ * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
+ * from a string so we can't refill the buffer, return EOF.
+ * 3) If the is more stuff in this buffer, use it else call read to fill it.
+ * 4) Process input up to the next newline, deleting nul characters.
+ */
+
+static int
+preadbuffer()
+{
+ char *p, *q;
+ int more;
+ char savec;
+
+ while (parsefile->strpush) {
+ if (
+ parsenleft == -1 && parsefile->strpush->ap &&
+ parsenextc[-1] != ' ' && parsenextc[-1] != '\t'
+ ) {
+ return PEOA;
+ }
+ popstring();
+ if (--parsenleft >= 0)
+ return (*parsenextc++);
+ }
+ if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
+ return PEOF;
+ flushout(&output);
+#ifdef FLUSHERR
+ flushout(&errout);
+#endif
+
+again:
+ if (parselleft <= 0) {
+ if ((parselleft = preadfd()) <= 0) {
+ parselleft = parsenleft = EOF_NLEFT;
+ return PEOF;
+ }
+ }
+
+ q = p = parsenextc;
+
+ /* delete nul characters */
+ for (more = 1; more;) {
+ switch (*p) {
+ case '\0':
+ p++; /* Skip nul */
+ goto check;
+
+
+ case '\n':
+ parsenleft = q - parsenextc;
+ more = 0; /* Stop processing here */
+ break;
+ }
+
+ *q++ = *p++;
+check:
+ if (--parselleft <= 0 && more) {
+ parsenleft = q - parsenextc - 1;
+ if (parsenleft < 0)
+ goto again;
+ more = 0;
+ }
+ }
+
+ savec = *q;
+ *q = '\0';
+
+ if (vflag) {
+ out2str(parsenextc);
+#ifdef FLUSHERR
+ flushout(out2);
+#endif
+ }
+
+ *q = savec;
+
+ return *parsenextc++;
+}
+
+/*
+ * Undo the last call to pgetc. Only one character may be pushed back.
+ * PEOF may be pushed back.
+ */
+
+static void
+pungetc() {
+ parsenleft++;
+ parsenextc--;
+}
+
+/*
+ * Push a string back onto the input at this current parsefile level.
+ * We handle aliases this way.
+ */
+static void
+pushstring(s, len, ap)
+ char *s;
+ int len;
+ void *ap;
+ {
+ struct strpush *sp;
+
+ INTOFF;
+/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
+ if (parsefile->strpush) {
+ sp = ckmalloc(sizeof (struct strpush));
+ sp->prev = parsefile->strpush;
+ parsefile->strpush = sp;
+ } else
+ sp = parsefile->strpush = &(parsefile->basestrpush);
+ sp->prevstring = parsenextc;
+ sp->prevnleft = parsenleft;
+ sp->ap = (struct alias *)ap;
+ if (ap) {
+ ((struct alias *)ap)->flag |= ALIASINUSE;
+ sp->string = s;
+ }
+ parsenextc = s;
+ parsenleft = len;
+ INTON;
+}
+
+static void
+popstring()
+{
+ struct strpush *sp = parsefile->strpush;
+
+ INTOFF;
+ if (sp->ap) {
+ if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
+ if (!checkalias) {
+ checkalias = 1;
+ }
+ }
+ if (sp->string != sp->ap->val) {
+ ckfree(sp->string);
+ }
+ sp->ap->flag &= ~ALIASINUSE;
+ if (sp->ap->flag & ALIASDEAD) {
+ unalias(sp->ap->name);
+ }
+ }
+ parsenextc = sp->prevstring;
+ parsenleft = sp->prevnleft;
+/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
+ parsefile->strpush = sp->prev;
+ if (sp != &(parsefile->basestrpush))
+ ckfree(sp);
+ INTON;
+}
+
+/*
+ * Set the input to take input from a file. If push is set, push the
+ * old input onto the stack first.
+ */
+
+static void
+setinputfile(fname, push)
+ const char *fname;
+ int push;
+{
+ int fd;
+ int myfileno2;
+
+ INTOFF;
+ if ((fd = open(fname, O_RDONLY)) < 0)
+ error("Can't open %s", fname);
+ if (fd < 10) {
+ myfileno2 = dup_as_newfd(fd, 10);
+ close(fd);
+ if (myfileno2 < 0)
+ error("Out of file descriptors");
+ fd = myfileno2;
+ }
+ setinputfd(fd, push);
+ INTON;
+}
+
+
+/*
+ * Like setinputfile, but takes an open file descriptor. Call this with
+ * interrupts off.
+ */
+
+static void
+setinputfd(fd, push)
+ int fd, push;
+{
+ (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
+ if (push) {
+ pushfile();
+ parsefile->buf = 0;
+ } else {
+ closescript();
+ while (parsefile->strpush)
+ popstring();
+ }
+ parsefile->fd = fd;
+ if (parsefile->buf == NULL)
+ parsefile->buf = ckmalloc(BUFSIZ);
+ parselleft = parsenleft = 0;
+ plinno = 1;
+}
+
+
+/*
+ * Like setinputfile, but takes input from a string.
+ */
+
+static void
+setinputstring(string)
+ char *string;
+ {
+ INTOFF;
+ pushfile();
+ parsenextc = string;
+ parsenleft = strlen(string);
+ parsefile->buf = NULL;
+ plinno = 1;
+ INTON;
+}
+
+
+
+/*
+ * To handle the "." command, a stack of input files is used. Pushfile
+ * adds a new entry to the stack and popfile restores the previous level.
+ */
+
+static void
+pushfile() {
+ struct parsefile *pf;
+
+ parsefile->nleft = parsenleft;
+ parsefile->lleft = parselleft;
+ parsefile->nextc = parsenextc;
+ parsefile->linno = plinno;
+ pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
+ pf->prev = parsefile;
+ pf->fd = -1;
+ pf->strpush = NULL;
+ pf->basestrpush.prev = NULL;
+ parsefile = pf;
+}
+
+
+static void
+popfile() {
+ struct parsefile *pf = parsefile;
+
+ INTOFF;
+ if (pf->fd >= 0)
+ close(pf->fd);
+ if (pf->buf)
+ ckfree(pf->buf);
+ while (pf->strpush)
+ popstring();
+ parsefile = pf->prev;
+ ckfree(pf);
+ parsenleft = parsefile->nleft;
+ parselleft = parsefile->lleft;
+ parsenextc = parsefile->nextc;
+ plinno = parsefile->linno;
+ INTON;
+}
+
+
+/*
+ * Return to top level.
+ */
+
+static void
+popallfiles() {
+ while (parsefile != &basepf)
+ popfile();
+}
+
+
+
+/*
+ * Close the file(s) that the shell is reading commands from. Called
+ * after a fork is done.
+ */
+
+static void
+closescript() {
+ popallfiles();
+ if (parsefile->fd > 0) {
+ close(parsefile->fd);
+ parsefile->fd = 0;
+ }
+}
+/* $NetBSD: jobs.c,v 1.36 2000/05/22 10:18:47 elric Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+struct job *jobtab; /* array of jobs */
+static int njobs; /* size of array */
+short backgndpid = -1; /* pid of last background process */
+#if JOBS
+static int initialpgrp; /* pgrp of shell on invocation */
+short curjob; /* current job */
+#endif
+static int intreceived;
+
+static void restartjob __P((struct job *));
+static void freejob __P((struct job *));
+static struct job *getjob __P((char *));
+static int dowait __P((int, struct job *));
+#ifdef SYSV
+static int onsigchild __P((void));
+#endif
+static int waitproc __P((int, int *));
+static void cmdtxt __P((union node *));
+static void cmdputs __P((const char *));
+static void waitonint(int);
+
+
+#if JOBS
+/*
+ * Turn job control on and off.
+ *
+ * Note: This code assumes that the third arg to ioctl is a character
+ * pointer, which is true on Berkeley systems but not System V. Since
+ * System V doesn't have job control yet, this isn't a problem now.
+ */
+
+static int jobctl;
+
+static void setjobctl(int enable)
+{
+#ifdef OLD_TTY_DRIVER
+ int ldisc;
+#endif
+
+ if (enable == jobctl || rootshell == 0)
+ return;
+ if (enable) {
+ do { /* while we are in the background */
+#ifdef OLD_TTY_DRIVER
+ if (ioctl(fileno2, TIOCGPGRP, (char *)&initialpgrp) < 0) {
+#else
+ initialpgrp = tcgetpgrp(fileno2);
+ if (initialpgrp < 0) {
+#endif
+ out2str("sh: can't access tty; job cenabletrol turned off\n");
+ mflag = 0;
+ return;
+ }
+ if (initialpgrp == -1)
+ initialpgrp = getpgrp();
+ else if (initialpgrp != getpgrp()) {
+ killpg(initialpgrp, SIGTTIN);
+ continue;
+ }
+ } while (0);
+#ifdef OLD_TTY_DRIVER
+ if (ioctl(fileno2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) {
+ out2str("sh: need new tty driver to run job cenabletrol; job cenabletrol turned off\n");
+ mflag = 0;
+ return;
+ }
+#endif
+ setsignal(SIGTSTP);
+ setsignal(SIGTTOU);
+ setsignal(SIGTTIN);
+ setpgid(0, rootpid);
+#ifdef OLD_TTY_DRIVER
+ ioctl(fileno2, TIOCSPGRP, (char *)&rootpid);
+#else
+ tcsetpgrp(fileno2, rootpid);
+#endif
+ } else { /* turning job cenabletrol off */
+ setpgid(0, initialpgrp);
+#ifdef OLD_TTY_DRIVER
+ ioctl(fileno2, TIOCSPGRP, (char *)&initialpgrp);
+#else
+ tcsetpgrp(fileno2, initialpgrp);
+#endif
+ setsignal(SIGTSTP);
+ setsignal(SIGTTOU);
+ setsignal(SIGTTIN);
+ }
+ jobctl = enable;
+}
+#endif
+
+
+#ifdef mkinit
+INCLUDE <stdlib.h>
+
+SHELLPROC {
+ backgndpid = -1;
+#if JOBS
+ jobctl = 0;
+#endif
+}
+
+#endif
+
+
+/* This file was automatically created by ./mksignames.
+ Do not edit. Edit support/mksignames.c instead. */
+
+/* A translation list so we can be polite to our users. */
+static char *signal_names[NSIG + 2] = {
+ "EXIT",
+ "SIGHUP",
+ "SIGINT",
+ "SIGQUIT",
+ "SIGILL",
+ "SIGTRAP",
+ "SIGABRT",
+ "SIGBUS",
+ "SIGFPE",
+ "SIGKILL",
+ "SIGUSR1",
+ "SIGSEGV",
+ "SIGUSR2",
+ "SIGPIPE",
+ "SIGALRM",
+ "SIGTERM",
+ "SIGJUNK(16)",
+ "SIGCHLD",
+ "SIGCONT",
+ "SIGSTOP",
+ "SIGTSTP",
+ "SIGTTIN",
+ "SIGTTOU",
+ "SIGURG",
+ "SIGXCPU",
+ "SIGXFSZ",
+ "SIGVTALRM",
+ "SIGPROF",
+ "SIGWINCH",
+ "SIGIO",
+ "SIGPWR",
+ "SIGSYS",
+ "SIGRTMIN",
+ "SIGRTMIN+1",
+ "SIGRTMIN+2",
+ "SIGRTMIN+3",
+ "SIGRTMIN+4",
+ "SIGRTMIN+5",
+ "SIGRTMIN+6",
+ "SIGRTMIN+7",
+ "SIGRTMIN+8",
+ "SIGRTMIN+9",
+ "SIGRTMIN+10",
+ "SIGRTMIN+11",
+ "SIGRTMIN+12",
+ "SIGRTMIN+13",
+ "SIGRTMIN+14",
+ "SIGRTMIN+15",
+ "SIGRTMAX-15",
+ "SIGRTMAX-14",
+ "SIGRTMAX-13",
+ "SIGRTMAX-12",
+ "SIGRTMAX-11",
+ "SIGRTMAX-10",
+ "SIGRTMAX-9",
+ "SIGRTMAX-8",
+ "SIGRTMAX-7",
+ "SIGRTMAX-6",
+ "SIGRTMAX-5",
+ "SIGRTMAX-4",
+ "SIGRTMAX-3",
+ "SIGRTMAX-2",
+ "SIGRTMAX-1",
+ "SIGRTMAX",
+ "DEBUG",
+ (char *)0x0,
+};
+
+
+
+#if JOBS
+static int
+killcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int signo = -1;
+ int list = 0;
+ int i;
+ pid_t pid;
+ struct job *jp;
+
+ if (argc <= 1) {
+usage:
+ error(
+"Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n"
+"kill -l [exitstatus]"
+ );
+ }
+
+ if (*argv[1] == '-') {
+ signo = decode_signal(argv[1] + 1, 1);
+ if (signo < 0) {
+ int c;
+
+ while ((c = nextopt("ls:")) != '\0')
+ switch (c) {
+ case 'l':
+ list = 1;
+ break;
+ case 's':
+ signo = decode_signal(optionarg, 1);
+ if (signo < 0) {
+ error(
+ "invalid signal number or name: %s",
+ optionarg
+ );
+ }
+ break;
+#ifdef DEBUG
+ default:
+ error(
+ "nextopt returned character code 0%o", c);
+#endif
+ }
+ } else
+ argptr++;
+ }
+
+ if (!list && signo < 0)
+ signo = SIGTERM;
+
+ if ((signo < 0 || !*argptr) ^ list) {
+ goto usage;
+ }
+
+ if (list) {
+ if (!*argptr) {
+ out1str("0\n");
+ for (i = 1; i < NSIG; i++) {
+ out1fmt(snlfmt, signal_names[i] + 3);
+ }
+ return 0;
+ }
+ signo = atoi(*argptr);
+ if (signo > 128)
+ signo -= 128;
+ if (0 < signo && signo < NSIG)
+ out1fmt(snlfmt, signal_names[signo] + 3);
+ else
+ error("invalid signal number or exit status: %s",
+ *argptr);
+ return 0;
+ }
+
+ do {
+ if (**argptr == '%') {
+ jp = getjob(*argptr);
+ if (jp->jobctl == 0)
+ error("job %s not created under job control",
+ *argptr);
+ pid = -jp->ps[0].pid;
+ } else
+ pid = atoi(*argptr);
+ if (kill(pid, signo) != 0)
+ error("%s: %s", *argptr, strerror(errno));
+ } while (*++argptr);
+
+ return 0;
+}
+
+static int
+fgcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct job *jp;
+ int pgrp;
+ int status;
+
+ jp = getjob(argv[1]);
+ if (jp->jobctl == 0)
+ error("job not created under job control");
+ pgrp = jp->ps[0].pid;
+#ifdef OLD_TTY_DRIVER
+ ioctl(fileno2, TIOCSPGRP, (char *)&pgrp);
+#else
+ tcsetpgrp(fileno2, pgrp);
+#endif
+ restartjob(jp);
+ INTOFF;
+ status = waitforjob(jp);
+ INTON;
+ return status;
+}
+
+
+static int
+bgcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct job *jp;
+
+ do {
+ jp = getjob(*++argv);
+ if (jp->jobctl == 0)
+ error("job not created under job control");
+ restartjob(jp);
+ } while (--argc > 1);
+ return 0;
+}
+
+
+static void
+restartjob(jp)
+ struct job *jp;
+{
+ struct procstat *ps;
+ int i;
+
+ if (jp->state == JOBDONE)
+ return;
+ INTOFF;
+ killpg(jp->ps[0].pid, SIGCONT);
+ for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
+ if (WIFSTOPPED(ps->status)) {
+ ps->status = -1;
+ jp->state = 0;
+ }
+ }
+ INTON;
+}
+#endif
+
+
+static int
+jobscmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ showjobs(0);
+ return 0;
+}
+
+
+/*
+ * Print a list of jobs. If "change" is nonzero, only print jobs whose
+ * statuses have changed since the last call to showjobs.
+ *
+ * If the shell is interrupted in the process of creating a job, the
+ * result may be a job structure containing zero processes. Such structures
+ * will be freed here.
+ */
+
+static void
+showjobs(change)
+ int change;
+{
+ int jobno;
+ int procno;
+ int i;
+ struct job *jp;
+ struct procstat *ps;
+ int col;
+ char s[64];
+
+ TRACE(("showjobs(%d) called\n", change));
+ while (dowait(0, (struct job *)NULL) > 0);
+ for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
+ if (! jp->used)
+ continue;
+ if (jp->nprocs == 0) {
+ freejob(jp);
+ continue;
+ }
+ if (change && ! jp->changed)
+ continue;
+ procno = jp->nprocs;
+ for (ps = jp->ps ; ; ps++) { /* for each process */
+ if (ps == jp->ps)
+ fmtstr(s, 64, "[%d] %ld ", jobno,
+ (long)ps->pid);
+ else
+ fmtstr(s, 64, " %ld ",
+ (long)ps->pid);
+ out1str(s);
+ col = strlen(s);
+ s[0] = '\0';
+ if (ps->status == -1) {
+ /* don't print anything */
+ } else if (WIFEXITED(ps->status)) {
+ fmtstr(s, 64, "Exit %d",
+ WEXITSTATUS(ps->status));
+ } else {
+#if JOBS
+ if (WIFSTOPPED(ps->status))
+ i = WSTOPSIG(ps->status);
+ else /* WIFSIGNALED(ps->status) */
+#endif
+ i = WTERMSIG(ps->status);
+ if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F])
+ scopy(sys_siglist[i & 0x7F], s);
+ else
+ fmtstr(s, 64, "Signal %d", i & 0x7F);
+ if (WCOREDUMP(ps->status))
+ strcat(s, " (core dumped)");
+ }
+ out1str(s);
+ col += strlen(s);
+ out1fmt(
+ "%*c%s\n", 30 - col >= 0 ? 30 - col : 0, ' ',
+ ps->cmd
+ );
+ if (--procno <= 0)
+ break;
+ }
+ jp->changed = 0;
+ if (jp->state == JOBDONE) {
+ freejob(jp);
+ }
+ }
+}
+
+
+/*
+ * Mark a job structure as unused.
+ */
+
+static void
+freejob(jp)
+ struct job *jp;
+ {
+ struct procstat *ps;
+ int i;
+
+ INTOFF;
+ for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
+ if (ps->cmd != nullstr)
+ ckfree(ps->cmd);
+ }
+ if (jp->ps != &jp->ps0)
+ ckfree(jp->ps);
+ jp->used = 0;
+#if JOBS
+ if (curjob == jp - jobtab + 1)
+ curjob = 0;
+#endif
+ INTON;
+}
+
+
+
+static int
+waitcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct job *job;
+ int status, retval;
+ struct job *jp;
+
+ if (--argc > 0) {
+start:
+ job = getjob(*++argv);
+ } else {
+ job = NULL;
+ }
+ for (;;) { /* loop until process terminated or stopped */
+ if (job != NULL) {
+ if (job->state) {
+ status = job->ps[job->nprocs - 1].status;
+ if (! iflag)
+ freejob(job);
+ if (--argc) {
+ goto start;
+ }
+ if (WIFEXITED(status))
+ retval = WEXITSTATUS(status);
+#if JOBS
+ else if (WIFSTOPPED(status))
+ retval = WSTOPSIG(status) + 128;
+#endif
+ else {
+ /* XXX: limits number of signals */
+ retval = WTERMSIG(status) + 128;
+ }
+ return retval;
+ }
+ } else {
+ for (jp = jobtab ; ; jp++) {
+ if (jp >= jobtab + njobs) { /* no running procs */
+ return 0;
+ }
+ if (jp->used && jp->state == 0)
+ break;
+ }
+ }
+ if (dowait(2, 0) < 0 && errno == EINTR) {
+ return 129;
+ }
+ }
+}
+
+
+
+/*
+ * Convert a job name to a job structure.
+ */
+
+static struct job *
+getjob(name)
+ char *name;
+ {
+ int jobno;
+ struct job *jp;
+ int pid;
+ int i;
+
+ if (name == NULL) {
+#if JOBS
+currentjob:
+ if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0)
+ error("No current job");
+ return &jobtab[jobno - 1];
+#else
+ error("No current job");
+#endif
+ } else if (name[0] == '%') {
+ if (is_digit(name[1])) {
+ jobno = number(name + 1);
+ if (jobno > 0 && jobno <= njobs
+ && jobtab[jobno - 1].used != 0)
+ return &jobtab[jobno - 1];
+#if JOBS
+ } else if (name[1] == '%' && name[2] == '\0') {
+ goto currentjob;
+#endif
+ } else {
+ struct job *found = NULL;
+ for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
+ if (jp->used && jp->nprocs > 0
+ && prefix(name + 1, jp->ps[0].cmd)) {
+ if (found)
+ error("%s: ambiguous", name);
+ found = jp;
+ }
+ }
+ if (found)
+ return found;
+ }
+ } else if (is_number(name)) {
+ pid = number(name);
+ for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
+ if (jp->used && jp->nprocs > 0
+ && jp->ps[jp->nprocs - 1].pid == pid)
+ return jp;
+ }
+ }
+ error("No such job: %s", name);
+ /* NOTREACHED */
+}
+
+
+
+/*
+ * Return a new job structure,
+ */
+
+struct job *
+makejob(node, nprocs)
+ union node *node;
+ int nprocs;
+{
+ int i;
+ struct job *jp;
+
+ for (i = njobs, jp = jobtab ; ; jp++) {
+ if (--i < 0) {
+ INTOFF;
+ if (njobs == 0) {
+ jobtab = ckmalloc(4 * sizeof jobtab[0]);
+ } else {
+ jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
+ memcpy(jp, jobtab, njobs * sizeof jp[0]);
+ /* Relocate `ps' pointers */
+ for (i = 0; i < njobs; i++)
+ if (jp[i].ps == &jobtab[i].ps0)
+ jp[i].ps = &jp[i].ps0;
+ ckfree(jobtab);
+ jobtab = jp;
+ }
+ jp = jobtab + njobs;
+ for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
+ INTON;
+ break;
+ }
+ if (jp->used == 0)
+ break;
+ }
+ INTOFF;
+ jp->state = 0;
+ jp->used = 1;
+ jp->changed = 0;
+ jp->nprocs = 0;
+#if JOBS
+ jp->jobctl = jobctl;
+#endif
+ if (nprocs > 1) {
+ jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
+ } else {
+ jp->ps = &jp->ps0;
+ }
+ INTON;
+ TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
+ jp - jobtab + 1));
+ return jp;
+}
+
+
+/*
+ * Fork of a subshell. If we are doing job control, give the subshell its
+ * own process group. Jp is a job structure that the job is to be added to.
+ * N is the command that will be evaluated by the child. Both jp and n may
+ * be NULL. The mode parameter can be one of the following:
+ * FORK_FG - Fork off a foreground process.
+ * FORK_BG - Fork off a background process.
+ * FORK_NOJOB - Like FORK_FG, but don't give the process its own
+ * process group even if job control is on.
+ *
+ * When job control is turned off, background processes have their standard
+ * input redirected to /dev/null (except for the second and later processes
+ * in a pipeline).
+ */
+
+static int
+forkshell(jp, n, mode)
+ union node *n;
+ struct job *jp;
+ int mode;
+{
+ int pid;
+ int pgrp;
+ const char *devnull = _PATH_DEVNULL;
+ const char *nullerr = "Can't open %s";
+
+ TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n,
+ mode));
+ INTOFF;
+ pid = fork();
+ if (pid == -1) {
+ TRACE(("Fork failed, errno=%d\n", errno));
+ INTON;
+ error("Cannot fork");
+ }
+ if (pid == 0) {
+ struct job *p;
+ int wasroot;
+ int i;
+
+ TRACE(("Child shell %d\n", getpid()));
+ wasroot = rootshell;
+ rootshell = 0;
+ closescript();
+ INTON;
+ clear_traps();
+#if JOBS
+ jobctl = 0; /* do job control only in root shell */
+ if (wasroot && mode != FORK_NOJOB && mflag) {
+ if (jp == NULL || jp->nprocs == 0)
+ pgrp = getpid();
+ else
+ pgrp = jp->ps[0].pid;
+ setpgid(0, pgrp);
+ if (mode == FORK_FG) {
+ /*** this causes superfluous TIOCSPGRPS ***/
+#ifdef OLD_TTY_DRIVER
+ if (ioctl(fileno2, TIOCSPGRP, (char *)&pgrp) < 0)
+ error("TIOCSPGRP failed, errno=%d", errno);
+#else
+ if (tcsetpgrp(fileno2, pgrp) < 0)
+ error("tcsetpgrp failed, errno=%d", errno);
+#endif
+ }
+ setsignal(SIGTSTP);
+ setsignal(SIGTTOU);
+ } else if (mode == FORK_BG) {
+ ignoresig(SIGINT);
+ ignoresig(SIGQUIT);
+ if ((jp == NULL || jp->nprocs == 0) &&
+ ! fd0_redirected_p ()) {
+ close(0);
+ if (open(devnull, O_RDONLY) != 0)
+ error(nullerr, devnull);
+ }
+ }
+#else
+ if (mode == FORK_BG) {
+ ignoresig(SIGINT);
+ ignoresig(SIGQUIT);
+ if ((jp == NULL || jp->nprocs == 0) &&
+ ! fd0_redirected_p ()) {
+ close(0);
+ if (open(devnull, O_RDONLY) != 0)
+ error(nullerr, devnull);
+ }
+ }
+#endif
+ for (i = njobs, p = jobtab ; --i >= 0 ; p++)
+ if (p->used)
+ freejob(p);
+ if (wasroot && iflag) {
+ setsignal(SIGINT);
+ setsignal(SIGQUIT);
+ setsignal(SIGTERM);
+ }
+ return pid;
+ }
+ if (rootshell && mode != FORK_NOJOB && mflag) {
+ if (jp == NULL || jp->nprocs == 0)
+ pgrp = pid;
+ else
+ pgrp = jp->ps[0].pid;
+ setpgid(pid, pgrp);
+ }
+ if (mode == FORK_BG)
+ backgndpid = pid; /* set $! */
+ if (jp) {
+ struct procstat *ps = &jp->ps[jp->nprocs++];
+ ps->pid = pid;
+ ps->status = -1;
+ ps->cmd = nullstr;
+ if (iflag && rootshell && n)
+ ps->cmd = commandtext(n);
+ }
+ INTON;
+ TRACE(("In parent shell: child = %d\n", pid));
+ return pid;
+}
+
+
+
+/*
+ * Wait for job to finish.
+ *
+ * Under job control we have the problem that while a child process is
+ * running interrupts generated by the user are sent to the child but not
+ * to the shell. This means that an infinite loop started by an inter-
+ * active user may be hard to kill. With job control turned off, an
+ * interactive user may place an interactive program inside a loop. If
+ * the interactive program catches interrupts, the user doesn't want
+ * these interrupts to also abort the loop. The approach we take here
+ * is to have the shell ignore interrupt signals while waiting for a
+ * forground process to terminate, and then send itself an interrupt
+ * signal if the child process was terminated by an interrupt signal.
+ * Unfortunately, some programs want to do a bit of cleanup and then
+ * exit on interrupt; unless these processes terminate themselves by
+ * sending a signal to themselves (instead of calling exit) they will
+ * confuse this approach.
+ */
+
+static int
+waitforjob(jp)
+ struct job *jp;
+ {
+#if JOBS
+ int mypgrp = getpgrp();
+#endif
+ int status;
+ int st;
+ struct sigaction act, oact;
+
+ INTOFF;
+ intreceived = 0;
+#if JOBS
+ if (!jobctl) {
+#else
+ if (!iflag) {
+#endif
+ sigaction(SIGINT, 0, &act);
+ act.sa_handler = waitonint;
+ sigaction(SIGINT, &act, &oact);
+ }
+ TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
+ while (jp->state == 0) {
+ dowait(1, jp);
+ }
+#if JOBS
+ if (!jobctl) {
+#else
+ if (!iflag) {
+#endif
+ sigaction(SIGINT, &oact, 0);
+ if (intreceived && trap[SIGINT]) kill(getpid(), SIGINT);
+ }
+#if JOBS
+ if (jp->jobctl) {
+#ifdef OLD_TTY_DRIVER
+ if (ioctl(fileno2, TIOCSPGRP, (char *)&mypgrp) < 0)
+ error("TIOCSPGRP failed, errno=%d\n", errno);
+#else
+ if (tcsetpgrp(fileno2, mypgrp) < 0)
+ error("tcsetpgrp failed, errno=%d\n", errno);
+#endif
+ }
+ if (jp->state == JOBSTOPPED)
+ curjob = jp - jobtab + 1;
+#endif
+ status = jp->ps[jp->nprocs - 1].status;
+ /* convert to 8 bits */
+ if (WIFEXITED(status))
+ st = WEXITSTATUS(status);
+#if JOBS
+ else if (WIFSTOPPED(status))
+ st = WSTOPSIG(status) + 128;
+#endif
+ else
+ st = WTERMSIG(status) + 128;
+#if JOBS
+ if (jp->jobctl) {
+ /*
+ * This is truly gross.
+ * If we're doing job control, then we did a TIOCSPGRP which
+ * caused us (the shell) to no longer be in the controlling
+ * session -- so we wouldn't have seen any ^C/SIGINT. So, we
+ * intuit from the subprocess exit status whether a SIGINT
+ * occured, and if so interrupt ourselves. Yuck. - mycroft
+ */
+ if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
+ raise(SIGINT);
+ }
+#endif
+ if (! JOBS || jp->state == JOBDONE)
+ freejob(jp);
+ INTON;
+ return st;
+}
+
+
+
+/*
+ * Wait for a process to terminate.
+ */
+
+static int
+dowait(block, job)
+ int block;
+ struct job *job;
+{
+ int pid;
+ int status;
+ struct procstat *sp;
+ struct job *jp;
+ struct job *thisjob;
+ int done;
+ int stopped;
+ int core;
+ int sig;
+
+ TRACE(("dowait(%d) called\n", block));
+ do {
+ pid = waitproc(block, &status);
+ TRACE(("wait returns %d, status=%d\n", pid, status));
+ } while (!(block & 2) && pid == -1 && errno == EINTR);
+ if (pid <= 0)
+ return pid;
+ INTOFF;
+ thisjob = NULL;
+ for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
+ if (jp->used) {
+ done = 1;
+ stopped = 1;
+ for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
+ if (sp->pid == -1)
+ continue;
+ if (sp->pid == pid) {
+ TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status));
+ sp->status = status;
+ thisjob = jp;
+ }
+ if (sp->status == -1)
+ stopped = 0;
+ else if (WIFSTOPPED(sp->status))
+ done = 0;
+ }
+ if (stopped) { /* stopped or done */
+ int state = done? JOBDONE : JOBSTOPPED;
+ if (jp->state != state) {
+ TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
+ jp->state = state;
+#if JOBS
+ if (done && curjob == jp - jobtab + 1)
+ curjob = 0; /* no current job */
+#endif
+ }
+ }
+ }
+ }
+ INTON;
+ if (! rootshell || ! iflag || (job && thisjob == job)) {
+ core = WCOREDUMP(status);
+#if JOBS
+ if (WIFSTOPPED(status)) sig = WSTOPSIG(status);
+ else
+#endif
+ if (WIFEXITED(status)) sig = 0;
+ else sig = WTERMSIG(status);
+
+ if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
+ if (thisjob != job)
+ outfmt(out2, "%d: ", pid);
+#if JOBS
+ if (sig == SIGTSTP && rootshell && iflag)
+ outfmt(out2, "%%%ld ",
+ (long)(job - jobtab + 1));
+#endif
+ if (sig < NSIG && sys_siglist[sig])
+ out2str(sys_siglist[sig]);
+ else
+ outfmt(out2, "Signal %d", sig);
+ if (core)
+ out2str(" - core dumped");
+ out2c('\n');
+#ifdef FLUSHERR
+ flushout(&errout);
+#endif
+ } else {
+ TRACE(("Not printing status: status=%d, sig=%d\n",
+ status, sig));
+ }
+ } else {
+ TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job));
+ if (thisjob)
+ thisjob->changed = 1;
+ }
+ return pid;
+}
+
+
+
+/*
+ * Do a wait system call. If job control is compiled in, we accept
+ * stopped processes. If block is zero, we return a value of zero
+ * rather than blocking.
+ *
+ * System V doesn't have a non-blocking wait system call. It does
+ * have a SIGCLD signal that is sent to a process when one of it's
+ * children dies. The obvious way to use SIGCLD would be to install
+ * a handler for SIGCLD which simply bumped a counter when a SIGCLD
+ * was received, and have waitproc bump another counter when it got
+ * the status of a process. Waitproc would then know that a wait
+ * system call would not block if the two counters were different.
+ * This approach doesn't work because if a process has children that
+ * have not been waited for, System V will send it a SIGCLD when it
+ * installs a signal handler for SIGCLD. What this means is that when
+ * a child exits, the shell will be sent SIGCLD signals continuously
+ * until is runs out of stack space, unless it does a wait call before
+ * restoring the signal handler. The code below takes advantage of
+ * this (mis)feature by installing a signal handler for SIGCLD and
+ * then checking to see whether it was called. If there are any
+ * children to be waited for, it will be.
+ *
+ * If neither SYSV nor BSD is defined, we don't implement nonblocking
+ * waits at all. In this case, the user will not be informed when
+ * a background process until the next time she runs a real program
+ * (as opposed to running a builtin command or just typing return),
+ * and the jobs command may give out of date information.
+ */
+
+#ifdef SYSV
+static int gotsigchild;
+
+static int onsigchild() {
+ gotsigchild = 1;
+}
+#endif
+
+
+static int
+waitproc(block, status)
+ int block;
+ int *status;
+{
+#ifdef BSD
+ int flags;
+
+ flags = 0;
+#if JOBS
+ if (jobctl)
+ flags |= WUNTRACED;
+#endif
+ if (block == 0)
+ flags |= WNOHANG;
+ return wait3(status, flags, (struct rusage *)NULL);
+#else
+#ifdef SYSV
+ int (*save)();
+
+ if (block == 0) {
+ gotsigchild = 0;
+ save = signal(SIGCLD, onsigchild);
+ signal(SIGCLD, save);
+ if (gotsigchild == 0)
+ return 0;
+ }
+ return wait(status);
+#else
+ if (block == 0)
+ return 0;
+ return wait(status);
+#endif
+#endif
+}
+
+/*
+ * return 1 if there are stopped jobs, otherwise 0
+ */
+static int job_warning = 0;
+static int
+stoppedjobs()
+{
+ int jobno;
+ struct job *jp;
+
+ if (job_warning)
+ return (0);
+ for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
+ if (jp->used == 0)
+ continue;
+ if (jp->state == JOBSTOPPED) {
+ out2str("You have stopped jobs.\n");
+ job_warning = 2;
+ return (1);
+ }
+ }
+
+ return (0);
+}
+
+/*
+ * Return a string identifying a command (to be printed by the
+ * jobs command.
+ */
+
+static char *cmdnextc;
+static int cmdnleft;
+#define MAXCMDTEXT 200
+
+static char *
+commandtext(n)
+ union node *n;
+ {
+ char *name;
+
+ cmdnextc = name = ckmalloc(MAXCMDTEXT);
+ cmdnleft = MAXCMDTEXT - 4;
+ cmdtxt(n);
+ *cmdnextc = '\0';
+ return name;
+}
+
+
+static void
+cmdtxt(n)
+ union node *n;
+ {
+ union node *np;
+ struct nodelist *lp;
+ const char *p;
+ int i;
+ char s[2];
+
+ if (n == NULL)
+ return;
+ switch (n->type) {
+ case NSEMI:
+ cmdtxt(n->nbinary.ch1);
+ cmdputs("; ");
+ cmdtxt(n->nbinary.ch2);
+ break;
+ case NAND:
+ cmdtxt(n->nbinary.ch1);
+ cmdputs(" && ");
+ cmdtxt(n->nbinary.ch2);
+ break;
+ case NOR:
+ cmdtxt(n->nbinary.ch1);
+ cmdputs(" || ");
+ cmdtxt(n->nbinary.ch2);
+ break;
+ case NPIPE:
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
+ cmdtxt(lp->n);
+ if (lp->next)
+ cmdputs(" | ");
+ }
+ break;
+ case NSUBSHELL:
+ cmdputs("(");
+ cmdtxt(n->nredir.n);
+ cmdputs(")");
+ break;
+ case NREDIR:
+ case NBACKGND:
+ cmdtxt(n->nredir.n);
+ break;
+ case NIF:
+ cmdputs("if ");
+ cmdtxt(n->nif.test);
+ cmdputs("; then ");
+ cmdtxt(n->nif.ifpart);
+ cmdputs("...");
+ break;
+ case NWHILE:
+ cmdputs("while ");
+ goto until;
+ case NUNTIL:
+ cmdputs("until ");
+until:
+ cmdtxt(n->nbinary.ch1);
+ cmdputs("; do ");
+ cmdtxt(n->nbinary.ch2);
+ cmdputs("; done");
+ break;
+ case NFOR:
+ cmdputs("for ");
+ cmdputs(n->nfor.var);
+ cmdputs(" in ...");
+ break;
+ case NCASE:
+ cmdputs("case ");
+ cmdputs(n->ncase.expr->narg.text);
+ cmdputs(" in ...");
+ break;
+ case NDEFUN:
+ cmdputs(n->narg.text);
+ cmdputs("() ...");
+ break;
+ case NCMD:
+ for (np = n->ncmd.args ; np ; np = np->narg.next) {
+ cmdtxt(np);
+ if (np->narg.next)
+ cmdputs(spcstr);
+ }
+ for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
+ cmdputs(spcstr);
+ cmdtxt(np);
+ }
+ break;
+ case NARG:
+ cmdputs(n->narg.text);
+ break;
+ case NTO:
+ p = ">"; i = 1; goto redir;
+ case NAPPEND:
+ p = ">>"; i = 1; goto redir;
+ case NTOFD:
+ p = ">&"; i = 1; goto redir;
+ case NTOOV:
+ p = ">|"; i = 1; goto redir;
+ case NFROM:
+ p = "<"; i = 0; goto redir;
+ case NFROMFD:
+ p = "<&"; i = 0; goto redir;
+ case NFROMTO:
+ p = "<>"; i = 0; goto redir;
+redir:
+ if (n->nfile.fd != i) {
+ s[0] = n->nfile.fd + '0';
+ s[1] = '\0';
+ cmdputs(s);
+ }
+ cmdputs(p);
+ if (n->type == NTOFD || n->type == NFROMFD) {
+ s[0] = n->ndup.dupfd + '0';
+ s[1] = '\0';
+ cmdputs(s);
+ } else {
+ cmdtxt(n->nfile.fname);
+ }
+ break;
+ case NHERE:
+ case NXHERE:
+ cmdputs("<<...");
+ break;
+ default:
+ cmdputs("???");
+ break;
+ }
+}
+
+
+
+static void
+cmdputs(s)
+ const char *s;
+ {
+ const char *p;
+ char *q;
+ char c;
+ int subtype = 0;
+
+ if (cmdnleft <= 0)
+ return;
+ p = s;
+ q = cmdnextc;
+ while ((c = *p++) != '\0') {
+ if (c == CTLESC)
+ *q++ = *p++;
+ else if (c == CTLVAR) {
+ *q++ = '$';
+ if (--cmdnleft > 0)
+ *q++ = '{';
+ subtype = *p++;
+ } else if (c == '=' && subtype != 0) {
+ *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
+ subtype = 0;
+ } else if (c == CTLENDVAR) {
+ *q++ = '}';
+ } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE)
+ cmdnleft++; /* ignore it */
+ else
+ *q++ = c;
+ if (--cmdnleft <= 0) {
+ *q++ = '.';
+ *q++ = '.';
+ *q++ = '.';
+ break;
+ }
+ }
+ cmdnextc = q;
+}
+
+static void waitonint(int sig) {
+ intreceived = 1;
+ return;
+}
+/* $NetBSD: mail.c,v 1.14 2000/07/03 03:26:19 matt Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Routines to check for mail. (Perhaps make part of main.c?)
+ */
+
+
+#define MAXMBOXES 10
+
+
+static int nmboxes; /* number of mailboxes */
+static time_t mailtime[MAXMBOXES]; /* times of mailboxes */
+
+
+
+/*
+ * Print appropriate message(s) if mail has arrived. If the argument is
+ * nozero, then the value of MAIL has changed, so we just update the
+ * values.
+ */
+
+static void
+chkmail(silent)
+ int silent;
+{
+ int i;
+ const char *mpath;
+ char *p;
+ char *q;
+ struct stackmark smark;
+ struct stat statb;
+
+ if (silent)
+ nmboxes = 10;
+ if (nmboxes == 0)
+ return;
+ setstackmark(&smark);
+ mpath = mpathset()? mpathval() : mailval();
+ for (i = 0 ; i < nmboxes ; i++) {
+ p = padvance(&mpath, nullstr);
+ if (p == NULL)
+ break;
+ if (*p == '\0')
+ continue;
+ for (q = p ; *q ; q++);
+#ifdef DEBUG
+ if (q[-1] != '/')
+ abort();
+#endif
+ q[-1] = '\0'; /* delete trailing '/' */
+#ifdef notdef /* this is what the System V shell claims to do (it lies) */
+ if (stat(p, &statb) < 0)
+ statb.st_mtime = 0;
+ if (statb.st_mtime > mailtime[i] && ! silent) {
+ outfmt(
+ &errout, snlfmt,
+ pathopt? pathopt : "you have mail"
+ );
+ }
+ mailtime[i] = statb.st_mtime;
+#else /* this is what it should do */
+ if (stat(p, &statb) < 0)
+ statb.st_size = 0;
+ if (statb.st_size > mailtime[i] && ! silent) {
+ outfmt(
+ &errout, snlfmt,
+ pathopt? pathopt : "you have mail"
+ );
+ }
+ mailtime[i] = statb.st_size;
+#endif
+ }
+ nmboxes = i;
+ popstackmark(&smark);
+}
+/* $NetBSD: main.c,v 1.40 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#define PROFILE 0
+
+static int rootpid;
+static int rootshell;
+#if PROFILE
+short profile_buf[16384];
+extern int etext();
+#endif
+
+static void read_profile __P((const char *));
+static char *find_dot_file __P((char *));
+int shell_main __P((int, char **));
+
+extern int oexitstatus;
+/*
+ * Main routine. We initialize things, parse the arguments, execute
+ * profiles if we're a login shell, and then call cmdloop to execute
+ * commands. The setjmp call sets up the location to jump to when an
+ * exception occurs. When an exception occurs the variable "state"
+ * is used to figure out how far we had gotten.
+ */
+
+int
+shell_main(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct jmploc jmploc;
+ struct stackmark smark;
+ volatile int state;
+ char *shinit;
+
+ DOTCMD = find_builtin(".");
+ BLTINCMD = find_builtin("builtin");
+ COMMANDCMD = find_builtin("command");
+ EXECCMD = find_builtin("exec");
+ EVALCMD = find_builtin("eval");
+
+#if PROFILE
+ monitor(4, etext, profile_buf, sizeof profile_buf, 50);
+#endif
+#if defined(linux) || defined(__GNU__)
+ signal(SIGCHLD, SIG_DFL);
+#endif
+ state = 0;
+ if (setjmp(jmploc.loc)) {
+ INTOFF;
+ /*
+ * When a shell procedure is executed, we raise the
+ * exception EXSHELLPROC to clean up before executing
+ * the shell procedure.
+ */
+ switch (exception) {
+ case EXSHELLPROC:
+ rootpid = getpid();
+ rootshell = 1;
+ minusc = NULL;
+ state = 3;
+ break;
+
+ case EXEXEC:
+ exitstatus = exerrno;
+ break;
+
+ case EXERROR:
+ exitstatus = 2;
+ break;
+
+ default:
+ break;
+ }
+
+ if (exception != EXSHELLPROC) {
+ if (state == 0 || iflag == 0 || ! rootshell)
+ exitshell(exitstatus);
+ }
+ reset();
+ if (exception == EXINT
+#if ATTY
+ && (! attyset() || equal(termval(), "emacs"))
+#endif
+ ) {
+ out2c('\n');
+#ifdef FLUSHERR
+ flushout(out2);
+#endif
+ }
+ popstackmark(&smark);
+ FORCEINTON; /* enable interrupts */
+ if (state == 1)
+ goto state1;
+ else if (state == 2)
+ goto state2;
+ else if (state == 3)
+ goto state3;
+ else
+ goto state4;
+ }
+ handler = &jmploc;
+#ifdef DEBUG
+ opentrace();
+ trputs("Shell args: "); trargs(argv);
+#endif
+ rootpid = getpid();
+ rootshell = 1;
+ init();
+ setstackmark(&smark);
+ procargs(argc, argv);
+ if (argv[0] && argv[0][0] == '-') {
+ state = 1;
+ read_profile("/etc/profile");
+state1:
+ state = 2;
+ read_profile(".profile");
+ }
+state2:
+ state = 3;
+#ifndef linux
+ if (getuid() == geteuid() && getgid() == getegid()) {
+#endif
+ if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
+ state = 3;
+ read_profile(shinit);
+ }
+#ifndef linux
+ }
+#endif
+state3:
+ state = 4;
+ if (sflag == 0 || minusc) {
+ static int sigs[] = {
+ SIGINT, SIGQUIT, SIGHUP,
+#ifdef SIGTSTP
+ SIGTSTP,
+#endif
+ SIGPIPE
+ };
+#define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0]))
+ int i;
+
+ for (i = 0; i < SIGSSIZE; i++)
+ setsignal(sigs[i]);
+ }
+
+ if (minusc)
+ evalstring(minusc, 0);
+
+ if (sflag || minusc == NULL) {
+state4: /* XXX ??? - why isn't this before the "if" statement */
+ cmdloop(1);
+ }
+#if PROFILE
+ monitor(0);
+#endif
+ exitshell(exitstatus);
+ /* NOTREACHED */
+}
+
+
+/*
+ * Read and execute commands. "Top" is nonzero for the top level command
+ * loop; it turns on prompting if the shell is interactive.
+ */
+
+static void
+cmdloop(top)
+ int top;
+{
+ union node *n;
+ struct stackmark smark;
+ int inter;
+ int numeof = 0;
+
+ TRACE(("cmdloop(%d) called\n", top));
+ setstackmark(&smark);
+ for (;;) {
+ if (pendingsigs)
+ dotrap();
+ inter = 0;
+ if (iflag && top) {
+ inter++;
+ showjobs(1);
+ chkmail(0);
+ flushout(&output);
+ }
+ n = parsecmd(inter);
+ /* showtree(n); DEBUG */
+ if (n == NEOF) {
+ if (!top || numeof >= 50)
+ break;
+ if (!stoppedjobs()) {
+ if (!Iflag)
+ break;
+ out2str("\nUse \"exit\" to leave shell.\n");
+ }
+ numeof++;
+ } else if (n != NULL && nflag == 0) {
+ job_warning = (job_warning == 2) ? 1 : 0;
+ numeof = 0;
+ evaltree(n, 0);
+ }
+ popstackmark(&smark);
+ setstackmark(&smark);
+ if (evalskip == SKIPFILE) {
+ evalskip = 0;
+ break;
+ }
+ }
+ popstackmark(&smark);
+}
+
+
+
+/*
+ * Read /etc/profile or .profile. Return on error.
+ */
+
+static void
+read_profile(name)
+ const char *name;
+{
+ int fd;
+ int xflag_set = 0;
+ int vflag_set = 0;
+
+ INTOFF;
+ if ((fd = open(name, O_RDONLY)) >= 0)
+ setinputfd(fd, 1);
+ INTON;
+ if (fd < 0)
+ return;
+ /* -q turns off -x and -v just when executing init files */
+ if (qflag) {
+ if (xflag)
+ xflag = 0, xflag_set = 1;
+ if (vflag)
+ vflag = 0, vflag_set = 1;
+ }
+ cmdloop(0);
+ if (qflag) {
+ if (xflag_set)
+ xflag = 1;
+ if (vflag_set)
+ vflag = 1;
+ }
+ popfile();
+}
+
+
+
+/*
+ * Read a file containing shell functions.
+ */
+
+static void
+readcmdfile(name)
+ char *name;
+{
+ int fd;
+
+ INTOFF;
+ if ((fd = open(name, O_RDONLY)) >= 0)
+ setinputfd(fd, 1);
+ else
+ error("Can't open %s", name);
+ INTON;
+ cmdloop(0);
+ popfile();
+}
+
+
+
+/*
+ * Take commands from a file. To be compatable we should do a path
+ * search for the file, which is necessary to find sub-commands.
+ */
+
+
+static char *
+find_dot_file(mybasename)
+ char *mybasename;
+{
+ char *fullname;
+ const char *path = pathval();
+ struct stat statb;
+
+ /* don't try this for absolute or relative paths */
+ if (strchr(mybasename, '/'))
+ return mybasename;
+
+ while ((fullname = padvance(&path, mybasename)) != NULL) {
+ if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
+ /*
+ * Don't bother freeing here, since it will
+ * be freed by the caller.
+ */
+ return fullname;
+ }
+ stunalloc(fullname);
+ }
+
+ /* not found in the PATH */
+ error("%s: not found", mybasename);
+ /* NOTREACHED */
+}
+
+static int
+dotcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct strlist *sp;
+ exitstatus = 0;
+
+ for (sp = cmdenviron; sp ; sp = sp->next)
+ setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED);
+
+ if (argc >= 2) { /* That's what SVR2 does */
+ char *fullname;
+ struct stackmark smark;
+
+ setstackmark(&smark);
+ fullname = find_dot_file(argv[1]);
+ setinputfile(fullname, 1);
+ commandname = fullname;
+ cmdloop(0);
+ popfile();
+ popstackmark(&smark);
+ }
+ return exitstatus;
+}
+
+
+static int
+exitcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ if (stoppedjobs())
+ return 0;
+ if (argc > 1)
+ exitstatus = number(argv[1]);
+ else
+ exitstatus = oexitstatus;
+ exitshell(exitstatus);
+ /* NOTREACHED */
+}
+/* $NetBSD: memalloc.c,v 1.23 2000/11/01 19:56:01 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+/*
+ * Parse trees for commands are allocated in lifo order, so we use a stack
+ * to make this more efficient, and also to avoid all sorts of exception
+ * handling code to handle interrupts in the middle of a parse.
+ *
+ * The size 504 was chosen because the Ultrix malloc handles that size
+ * well.
+ */
+
+#define MINSIZE 504 /* minimum size of a block */
+
+
+struct stack_block {
+ struct stack_block *prev;
+ char space[MINSIZE];
+};
+
+struct stack_block stackbase;
+struct stack_block *stackp = &stackbase;
+struct stackmark *markp;
+static char *stacknxt = stackbase.space;
+static int stacknleft = MINSIZE;
+static int sstrnleft;
+static int herefd = -1;
+
+
+
+pointer
+stalloc(nbytes)
+ int nbytes;
+{
+ char *p;
+
+ nbytes = ALIGN(nbytes);
+ if (nbytes > stacknleft) {
+ int blocksize;
+ struct stack_block *sp;
+
+ blocksize = nbytes;
+ if (blocksize < MINSIZE)
+ blocksize = MINSIZE;
+ INTOFF;
+ sp = ckmalloc(sizeof(struct stack_block) - MINSIZE + blocksize);
+ sp->prev = stackp;
+ stacknxt = sp->space;
+ stacknleft = blocksize;
+ stackp = sp;
+ INTON;
+ }
+ p = stacknxt;
+ stacknxt += nbytes;
+ stacknleft -= nbytes;
+ return p;
+}
+
+
+static void
+stunalloc(p)
+ pointer p;
+ {
+#ifdef DEBUG
+ if (p == NULL) { /*DEBUG */
+ write(2, "stunalloc\n", 10);
+ abort();
+ }
+#endif
+ if (!(stacknxt >= (char *)p && (char *)p >= stackp->space)) {
+ p = stackp->space;
+ }
+ stacknleft += stacknxt - (char *)p;
+ stacknxt = p;
+}
+
+
+
+static void
+setstackmark(mark)
+ struct stackmark *mark;
+ {
+ mark->stackp = stackp;
+ mark->stacknxt = stacknxt;
+ mark->stacknleft = stacknleft;
+ mark->marknext = markp;
+ markp = mark;
+}
+
+
+static void
+popstackmark(mark)
+ struct stackmark *mark;
+ {
+ struct stack_block *sp;
+
+ INTOFF;
+ markp = mark->marknext;
+ while (stackp != mark->stackp) {
+ sp = stackp;
+ stackp = sp->prev;
+ ckfree(sp);
+ }
+ stacknxt = mark->stacknxt;
+ stacknleft = mark->stacknleft;
+ INTON;
+}
+
+
+/*
+ * When the parser reads in a string, it wants to stick the string on the
+ * stack and only adjust the stack pointer when it knows how big the
+ * string is. Stackblock (defined in stack.h) returns a pointer to a block
+ * of space on top of the stack and stackblocklen returns the length of
+ * this block. Growstackblock will grow this space by at least one byte,
+ * possibly moving it (like realloc). Grabstackblock actually allocates the
+ * part of the block that has been used.
+ */
+
+static void
+growstackblock() {
+ char *p;
+ int newlen = ALIGN(stacknleft * 2 + 100);
+ char *oldspace = stacknxt;
+ int oldlen = stacknleft;
+ struct stack_block *sp;
+ struct stack_block *oldstackp;
+
+ if (stacknxt == stackp->space && stackp != &stackbase) {
+ INTOFF;
+ oldstackp = stackp;
+ sp = stackp;
+ stackp = sp->prev;
+ sp = ckrealloc((pointer)sp, sizeof(struct stack_block) - MINSIZE + newlen);
+ sp->prev = stackp;
+ stackp = sp;
+ stacknxt = sp->space;
+ stacknleft = newlen;
+ {
+ /* Stack marks pointing to the start of the old block
+ * must be relocated to point to the new block
+ */
+ struct stackmark *xmark;
+ xmark = markp;
+ while (xmark != NULL && xmark->stackp == oldstackp) {
+ xmark->stackp = stackp;
+ xmark->stacknxt = stacknxt;
+ xmark->stacknleft = stacknleft;
+ xmark = xmark->marknext;
+ }
+ }
+ INTON;
+ } else {
+ p = stalloc(newlen);
+ memcpy(p, oldspace, oldlen);
+ stacknxt = p; /* free the space */
+ stacknleft += newlen; /* we just allocated */
+ }
+}
+
+
+
+static void
+grabstackblock(len)
+ int len;
+{
+ len = ALIGN(len);
+ stacknxt += len;
+ stacknleft -= len;
+}
+
+
+
+/*
+ * The following routines are somewhat easier to use that the above.
+ * The user declares a variable of type STACKSTR, which may be declared
+ * to be a register. The macro STARTSTACKSTR initializes things. Then
+ * the user uses the macro STPUTC to add characters to the string. In
+ * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
+ * grown as necessary. When the user is done, she can just leave the
+ * string there and refer to it using stackblock(). Or she can allocate
+ * the space for it using grabstackstr(). If it is necessary to allow
+ * someone else to use the stack temporarily and then continue to grow
+ * the string, the user should use grabstack to allocate the space, and
+ * then call ungrabstr(p) to return to the previous mode of operation.
+ *
+ * USTPUTC is like STPUTC except that it doesn't check for overflow.
+ * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
+ * is space for at least one character.
+ */
+
+
+static char *
+growstackstr() {
+ int len = stackblocksize();
+ if (herefd >= 0 && len >= 1024) {
+ xwrite(herefd, stackblock(), len);
+ sstrnleft = len - 1;
+ return stackblock();
+ }
+ growstackblock();
+ sstrnleft = stackblocksize() - len - 1;
+ return stackblock() + len;
+}
+
+
+/*
+ * Called from CHECKSTRSPACE.
+ */
+
+static char *
+makestrspace(size_t newlen) {
+ int len = stackblocksize() - sstrnleft;
+ do {
+ growstackblock();
+ sstrnleft = stackblocksize() - len;
+ } while (sstrnleft < newlen);
+ return stackblock() + len;
+}
+
+
+
+static void
+ungrabstackstr(s, p)
+ char *s;
+ char *p;
+ {
+ stacknleft += stacknxt - s;
+ stacknxt = s;
+ sstrnleft = stacknleft - (p - s);
+}
+/* $NetBSD: miscbltin.c,v 1.30 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Miscelaneous builtins.
+ */
+
+
+#undef rflag
+
+#ifdef __GLIBC__
+mode_t getmode(const void *, mode_t);
+static void *setmode(const char *);
+
+#if !defined(__GLIBC__) || __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
+typedef enum __rlimit_resource rlim_t;
+#endif
+#endif
+
+
+
+/*
+ * The read builtin. The -e option causes backslashes to escape the
+ * following character.
+ *
+ * This uses unbuffered input, which may be avoidable in some cases.
+ */
+
+static int
+readcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char **ap;
+ int backslash;
+ char c;
+ int rflag;
+ char *prompt;
+ const char *ifs;
+ char *p;
+ int startword;
+ int status;
+ int i;
+
+ rflag = 0;
+ prompt = NULL;
+ while ((i = nextopt("p:r")) != '\0') {
+ if (i == 'p')
+ prompt = optionarg;
+ else
+ rflag = 1;
+ }
+ if (prompt && isatty(0)) {
+ putprompt(prompt);
+ flushall();
+ }
+ if (*(ap = argptr) == NULL)
+ error("arg count");
+ if ((ifs = bltinlookup("IFS")) == NULL)
+ ifs = defifs;
+ status = 0;
+ startword = 1;
+ backslash = 0;
+ STARTSTACKSTR(p);
+ for (;;) {
+ if (read(0, &c, 1) != 1) {
+ status = 1;
+ break;
+ }
+ if (c == '\0')
+ continue;
+ if (backslash) {
+ backslash = 0;
+ if (c != '\n')
+ STPUTC(c, p);
+ continue;
+ }
+ if (!rflag && c == '\\') {
+ backslash++;
+ continue;
+ }
+ if (c == '\n')
+ break;
+ if (startword && *ifs == ' ' && strchr(ifs, c)) {
+ continue;
+ }
+ startword = 0;
+ if (backslash && c == '\\') {
+ if (read(0, &c, 1) != 1) {
+ status = 1;
+ break;
+ }
+ STPUTC(c, p);
+ } else if (ap[1] != NULL && strchr(ifs, c) != NULL) {
+ STACKSTRNUL(p);
+ setvar(*ap, stackblock(), 0);
+ ap++;
+ startword = 1;
+ STARTSTACKSTR(p);
+ } else {
+ STPUTC(c, p);
+ }
+ }
+ STACKSTRNUL(p);
+ /* Remove trailing blanks */
+ while (stackblock() <= --p && strchr(ifs, *p) != NULL)
+ *p = '\0';
+ setvar(*ap, stackblock(), 0);
+ while (*++ap != NULL)
+ setvar(*ap, nullstr, 0);
+ return status;
+}
+
+
+
+static int
+umaskcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char *ap;
+ int mask;
+ int i;
+ int symbolic_mode = 0;
+
+ while ((i = nextopt("S")) != '\0') {
+ symbolic_mode = 1;
+ }
+
+ INTOFF;
+ mask = umask(0);
+ umask(mask);
+ INTON;
+
+ if ((ap = *argptr) == NULL) {
+ if (symbolic_mode) {
+ char u[4], g[4], o[4];
+
+ i = 0;
+ if ((mask & S_IRUSR) == 0)
+ u[i++] = 'r';
+ if ((mask & S_IWUSR) == 0)
+ u[i++] = 'w';
+ if ((mask & S_IXUSR) == 0)
+ u[i++] = 'x';
+ u[i] = '\0';
+
+ i = 0;
+ if ((mask & S_IRGRP) == 0)
+ g[i++] = 'r';
+ if ((mask & S_IWGRP) == 0)
+ g[i++] = 'w';
+ if ((mask & S_IXGRP) == 0)
+ g[i++] = 'x';
+ g[i] = '\0';
+
+ i = 0;
+ if ((mask & S_IROTH) == 0)
+ o[i++] = 'r';
+ if ((mask & S_IWOTH) == 0)
+ o[i++] = 'w';
+ if ((mask & S_IXOTH) == 0)
+ o[i++] = 'x';
+ o[i] = '\0';
+
+ out1fmt("u=%s,g=%s,o=%s\n", u, g, o);
+ } else {
+ out1fmt("%.4o\n", mask);
+ }
+ } else {
+ if (isdigit((unsigned char)*ap)) {
+ mask = 0;
+ do {
+ if (*ap >= '8' || *ap < '0')
+ error("Illegal number: %s", argv[1]);
+ mask = (mask << 3) + (*ap - '0');
+ } while (*++ap != '\0');
+ umask(mask);
+ } else {
+ void *set;
+
+ INTOFF;
+ if ((set = setmode(ap)) != 0) {
+ mask = getmode(set, ~mask & 0777);
+ ckfree(set);
+ }
+ INTON;
+ if (!set)
+ error("Illegal mode: %s", ap);
+
+ umask(~mask & 0777);
+ }
+ }
+ return 0;
+}
+
+/*
+ * ulimit builtin
+ *
+ * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
+ * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
+ * ash by J.T. Conklin.
+ *
+ * Public domain.
+ */
+
+struct limits {
+ const char *name;
+ int cmd;
+ int factor; /* multiply by to get rlim_{cur,max} values */
+ char option;
+};
+
+static const struct limits limits[] = {
+#ifdef RLIMIT_CPU
+ { "time(seconds)", RLIMIT_CPU, 1, 't' },
+#endif
+#ifdef RLIMIT_FSIZE
+ { "file(blocks)", RLIMIT_FSIZE, 512, 'f' },
+#endif
+#ifdef RLIMIT_DATA
+ { "data(kbytes)", RLIMIT_DATA, 1024, 'd' },
+#endif
+#ifdef RLIMIT_STACK
+ { "stack(kbytes)", RLIMIT_STACK, 1024, 's' },
+#endif
+#ifdef RLIMIT_CORE
+ { "coredump(blocks)", RLIMIT_CORE, 512, 'c' },
+#endif
+#ifdef RLIMIT_RSS
+ { "memory(kbytes)", RLIMIT_RSS, 1024, 'm' },
+#endif
+#ifdef RLIMIT_MEMLOCK
+ { "locked memory(kbytes)", RLIMIT_MEMLOCK, 1024, 'l' },
+#endif
+#ifdef RLIMIT_NPROC
+ { "process(processes)", RLIMIT_NPROC, 1, 'p' },
+#endif
+#ifdef RLIMIT_NOFILE
+ { "nofiles(descriptors)", RLIMIT_NOFILE, 1, 'n' },
+#endif
+#ifdef RLIMIT_VMEM
+ { "vmemory(kbytes)", RLIMIT_VMEM, 1024, 'v' },
+#endif
+#ifdef RLIMIT_SWAP
+ { "swap(kbytes)", RLIMIT_SWAP, 1024, 'w' },
+#endif
+ { (char *) 0, 0, 0, '\0' }
+};
+
+static int
+ulimitcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int c;
+ rlim_t val = 0;
+ enum { SOFT = 0x1, HARD = 0x2 }
+ how = SOFT | HARD;
+ const struct limits *l;
+ int set, all = 0;
+ int optc, what;
+ struct rlimit limit;
+
+ what = 'f';
+ while ((optc = nextopt("HSatfdsmcnpl")) != '\0')
+ switch (optc) {
+ case 'H':
+ how = HARD;
+ break;
+ case 'S':
+ how = SOFT;
+ break;
+ case 'a':
+ all = 1;
+ break;
+ default:
+ what = optc;
+ }
+
+ for (l = limits; l->name && l->option != what; l++)
+ ;
+ if (!l->name)
+ error("internal error (%c)", what);
+
+ set = *argptr ? 1 : 0;
+ if (set) {
+ char *p = *argptr;
+
+ if (all || argptr[1])
+ error("too many arguments");
+ if (strcmp(p, "unlimited") == 0)
+ val = RLIM_INFINITY;
+ else {
+ val = (rlim_t) 0;
+
+ while ((c = *p++) >= '0' && c <= '9')
+ {
+ val = (val * 10) + (long)(c - '0');
+ if (val < (rlim_t) 0)
+ break;
+ }
+ if (c)
+ error("bad number");
+ val *= l->factor;
+ }
+ }
+ if (all) {
+ for (l = limits; l->name; l++) {
+ getrlimit(l->cmd, &limit);
+ if (how & SOFT)
+ val = limit.rlim_cur;
+ else if (how & HARD)
+ val = limit.rlim_max;
+
+ out1fmt("%-20s ", l->name);
+ if (val == RLIM_INFINITY)
+ out1fmt("unlimited\n");
+ else
+ {
+ val /= l->factor;
+#ifdef BSD4_4
+ out1fmt("%lld\n", (long long) val);
+#else
+ out1fmt("%ld\n", (long) val);
+#endif
+ }
+ }
+ return 0;
+ }
+
+ getrlimit(l->cmd, &limit);
+ if (set) {
+ if (how & HARD)
+ limit.rlim_max = val;
+ if (how & SOFT)
+ limit.rlim_cur = val;
+ if (setrlimit(l->cmd, &limit) < 0)
+ error("error setting limit (%s)", strerror(errno));
+ } else {
+ if (how & SOFT)
+ val = limit.rlim_cur;
+ else if (how & HARD)
+ val = limit.rlim_max;
+
+ if (val == RLIM_INFINITY)
+ out1fmt("unlimited\n");
+ else
+ {
+ val /= l->factor;
+#ifdef BSD4_4
+ out1fmt("%lld\n", (long long) val);
+#else
+ out1fmt("%ld\n", (long) val);
+#endif
+ }
+ }
+ return 0;
+}
+/* $NetBSD: mystring.c,v 1.14 1999/07/09 03:05:50 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * String functions.
+ *
+ * equal(s1, s2) Return true if strings are equal.
+ * scopy(from, to) Copy a string.
+ * scopyn(from, to, n) Like scopy, but checks for overflow.
+ * number(s) Convert a string of digits to an integer.
+ * is_number(s) Return true if s is a string of digits.
+ */
+
+static char nullstr[1]; /* zero length string */
+static const char spcstr[] = " ";
+static const char snlfmt[] = "%s\n";
+
+/*
+ * equal - #defined in mystring.h
+ */
+
+/*
+ * scopy - #defined in mystring.h
+ */
+
+
+#if 0
+/*
+ * scopyn - copy a string from "from" to "to", truncating the string
+ * if necessary. "To" is always nul terminated, even if
+ * truncation is performed. "Size" is the size of "to".
+ */
+
+static void
+scopyn(from, to, size)
+ char const *from;
+ char *to;
+ int size;
+ {
+
+ while (--size > 0) {
+ if ((*to++ = *from++) == '\0')
+ return;
+ }
+ *to = '\0';
+}
+#endif
+
+
+/*
+ * prefix -- see if pfx is a prefix of string.
+ */
+
+static int
+prefix(pfx, string)
+ char const *pfx;
+ char const *string;
+ {
+ while (*pfx) {
+ if (*pfx++ != *string++)
+ return 0;
+ }
+ return 1;
+}
+
+
+/*
+ * Convert a string of digits to an integer, printing an error message on
+ * failure.
+ */
+
+static int
+number(s)
+ const char *s;
+ {
+
+ if (! is_number(s))
+ error("Illegal number: %s", s);
+ return atoi(s);
+}
+
+
+
+/*
+ * Check for a valid number. This should be elsewhere.
+ */
+
+static int
+is_number(p)
+ const char *p;
+ {
+ do {
+ if (! is_digit(*p))
+ return 0;
+ } while (*++p != '\0');
+ return 1;
+}
+
+
+/*
+ * Produce a possibly single quoted string suitable as input to the shell.
+ * The return string is allocated on the stack.
+ */
+
+static char *
+single_quote(const char *s) {
+ char *p;
+
+ STARTSTACKSTR(p);
+
+ do {
+ char *q = p;
+ size_t len1, len1p, len2, len2p;
+
+ len1 = strcspn(s, "'");
+ len2 = strspn(s + len1, "'");
+
+ len1p = len1 ? len1 + 2 : len1;
+ switch (len2) {
+ case 0:
+ len2p = 0;
+ break;
+ case 1:
+ len2p = 2;
+ break;
+ default:
+ len2p = len2 + 2;
+ }
+
+ CHECKSTRSPACE(len1p + len2p + 1, p);
+
+ if (len1) {
+ *p = '\'';
+#ifdef _GNU_SOURCE
+ q = mempcpy(p + 1, s, len1);
+#else
+ q = p + 1 + len1;
+ memcpy(p + 1, s, len1);
+#endif
+ *q++ = '\'';
+ s += len1;
+ }
+
+ switch (len2) {
+ case 0:
+ break;
+ case 1:
+ *q++ = '\\';
+ *q = '\'';
+ s++;
+ break;
+ default:
+ *q = '"';
+#ifdef _GNU_SOURCE
+ *(char *) mempcpy(q + 1, s, len2) = '"';
+#else
+ q += 1 + len2;
+ memcpy(q + 1, s, len2);
+ *q = '"';
+#endif
+ s += len2;
+ }
+
+ STADJUST(len1p + len2p, p);
+ } while (*s);
+
+ USTPUTC(0, p);
+
+ return grabstackstr(p);
+}
+
+/*
+ * Like strdup but works with the ash stack.
+ */
+
+static char *
+sstrdup(const char *p)
+{
+ size_t len = strlen(p) + 1;
+ return memcpy(stalloc(len), p, len);
+}
+
+/*
+ * Wrapper around strcmp for qsort/bsearch/...
+ */
+static int
+pstrcmp(const void *a, const void *b)
+{
+ return strcmp(*(const char *const *) a, *(const char *const *) b);
+}
+
+/*
+ * Find a string is in a sorted array.
+ */
+static const char *const *
+findstring(const char *s, const char *const *array, size_t nmemb)
+{
+ return bsearch(&s, array, nmemb, sizeof(const char *), pstrcmp);
+}
+/*
+ * This file was generated by the mknodes program.
+ */
+
+/* $NetBSD: nodes.c.pat,v 1.8 1997/04/11 23:03:09 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)nodes.c.pat 8.2 (Berkeley) 5/4/95
+ */
+
+/*
+ * Routine for dealing with parsed shell commands.
+ */
+
+
+static int funcblocksize; /* size of structures in function */
+static int funcstringsize; /* size of strings in node */
+pointer funcblock; /* block to allocate function from */
+static char *funcstring; /* block to allocate strings from */
+
+static const short nodesize[26] = {
+ ALIGN(sizeof (struct nbinary)),
+ ALIGN(sizeof (struct ncmd)),
+ ALIGN(sizeof (struct npipe)),
+ ALIGN(sizeof (struct nredir)),
+ ALIGN(sizeof (struct nredir)),
+ ALIGN(sizeof (struct nredir)),
+ ALIGN(sizeof (struct nbinary)),
+ ALIGN(sizeof (struct nbinary)),
+ ALIGN(sizeof (struct nif)),
+ ALIGN(sizeof (struct nbinary)),
+ ALIGN(sizeof (struct nbinary)),
+ ALIGN(sizeof (struct nfor)),
+ ALIGN(sizeof (struct ncase)),
+ ALIGN(sizeof (struct nclist)),
+ ALIGN(sizeof (struct narg)),
+ ALIGN(sizeof (struct narg)),
+ ALIGN(sizeof (struct nfile)),
+ ALIGN(sizeof (struct nfile)),
+ ALIGN(sizeof (struct nfile)),
+ ALIGN(sizeof (struct nfile)),
+ ALIGN(sizeof (struct nfile)),
+ ALIGN(sizeof (struct ndup)),
+ ALIGN(sizeof (struct ndup)),
+ ALIGN(sizeof (struct nhere)),
+ ALIGN(sizeof (struct nhere)),
+ ALIGN(sizeof (struct nnot)),
+};
+
+
+static void calcsize __P((union node *));
+static void sizenodelist __P((struct nodelist *));
+static union node *copynode __P((union node *));
+static struct nodelist *copynodelist __P((struct nodelist *));
+static char *nodesavestr __P((char *));
+
+
+
+/*
+ * Make a copy of a parse tree.
+ */
+
+union node *
+copyfunc(n)
+ union node *n;
+{
+ if (n == NULL)
+ return NULL;
+ funcblocksize = 0;
+ funcstringsize = 0;
+ calcsize(n);
+ funcblock = ckmalloc(funcblocksize + funcstringsize);
+ funcstring = (char *) funcblock + funcblocksize;
+ return copynode(n);
+}
+
+
+
+static void
+calcsize(n)
+ union node *n;
+{
+ if (n == NULL)
+ return;
+ funcblocksize += nodesize[n->type];
+ switch (n->type) {
+ case NSEMI:
+ case NAND:
+ case NOR:
+ case NWHILE:
+ case NUNTIL:
+ calcsize(n->nbinary.ch2);
+ calcsize(n->nbinary.ch1);
+ break;
+ case NCMD:
+ calcsize(n->ncmd.redirect);
+ calcsize(n->ncmd.args);
+ calcsize(n->ncmd.assign);
+ break;
+ case NPIPE:
+ sizenodelist(n->npipe.cmdlist);
+ break;
+ case NREDIR:
+ case NBACKGND:
+ case NSUBSHELL:
+ calcsize(n->nredir.redirect);
+ calcsize(n->nredir.n);
+ break;
+ case NIF:
+ calcsize(n->nif.elsepart);
+ calcsize(n->nif.ifpart);
+ calcsize(n->nif.test);
+ break;
+ case NFOR:
+ funcstringsize += strlen(n->nfor.var) + 1;
+ calcsize(n->nfor.body);
+ calcsize(n->nfor.args);
+ break;
+ case NCASE:
+ calcsize(n->ncase.cases);
+ calcsize(n->ncase.expr);
+ break;
+ case NCLIST:
+ calcsize(n->nclist.body);
+ calcsize(n->nclist.pattern);
+ calcsize(n->nclist.next);
+ break;
+ case NDEFUN:
+ case NARG:
+ sizenodelist(n->narg.backquote);
+ funcstringsize += strlen(n->narg.text) + 1;
+ calcsize(n->narg.next);
+ break;
+ case NTO:
+ case NFROM:
+ case NFROMTO:
+ case NAPPEND:
+ case NTOOV:
+ calcsize(n->nfile.fname);
+ calcsize(n->nfile.next);
+ break;
+ case NTOFD:
+ case NFROMFD:
+ calcsize(n->ndup.vname);
+ calcsize(n->ndup.next);
+ break;
+ case NHERE:
+ case NXHERE:
+ calcsize(n->nhere.doc);
+ calcsize(n->nhere.next);
+ break;
+ case NNOT:
+ calcsize(n->nnot.com);
+ break;
+ };
+}
+
+
+
+static void
+sizenodelist(lp)
+ struct nodelist *lp;
+{
+ while (lp) {
+ funcblocksize += ALIGN(sizeof(struct nodelist));
+ calcsize(lp->n);
+ lp = lp->next;
+ }
+}
+
+
+
+static union node *
+copynode(n)
+ union node *n;
+{
+ union node *new;
+
+ if (n == NULL)
+ return NULL;
+ new = funcblock;
+ funcblock = (char *) funcblock + nodesize[n->type];
+ switch (n->type) {
+ case NSEMI:
+ case NAND:
+ case NOR:
+ case NWHILE:
+ case NUNTIL:
+ new->nbinary.ch2 = copynode(n->nbinary.ch2);
+ new->nbinary.ch1 = copynode(n->nbinary.ch1);
+ break;
+ case NCMD:
+ new->ncmd.redirect = copynode(n->ncmd.redirect);
+ new->ncmd.args = copynode(n->ncmd.args);
+ new->ncmd.assign = copynode(n->ncmd.assign);
+ new->ncmd.backgnd = n->ncmd.backgnd;
+ break;
+ case NPIPE:
+ new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
+ new->npipe.backgnd = n->npipe.backgnd;
+ break;
+ case NREDIR:
+ case NBACKGND:
+ case NSUBSHELL:
+ new->nredir.redirect = copynode(n->nredir.redirect);
+ new->nredir.n = copynode(n->nredir.n);
+ break;
+ case NIF:
+ new->nif.elsepart = copynode(n->nif.elsepart);
+ new->nif.ifpart = copynode(n->nif.ifpart);
+ new->nif.test = copynode(n->nif.test);
+ break;
+ case NFOR:
+ new->nfor.var = nodesavestr(n->nfor.var);
+ new->nfor.body = copynode(n->nfor.body);
+ new->nfor.args = copynode(n->nfor.args);
+ break;
+ case NCASE:
+ new->ncase.cases = copynode(n->ncase.cases);
+ new->ncase.expr = copynode(n->ncase.expr);
+ break;
+ case NCLIST:
+ new->nclist.body = copynode(n->nclist.body);
+ new->nclist.pattern = copynode(n->nclist.pattern);
+ new->nclist.next = copynode(n->nclist.next);
+ break;
+ case NDEFUN:
+ case NARG:
+ new->narg.backquote = copynodelist(n->narg.backquote);
+ new->narg.text = nodesavestr(n->narg.text);
+ new->narg.next = copynode(n->narg.next);
+ break;
+ case NTO:
+ case NFROM:
+ case NFROMTO:
+ case NAPPEND:
+ case NTOOV:
+ new->nfile.fname = copynode(n->nfile.fname);
+ new->nfile.fd = n->nfile.fd;
+ new->nfile.next = copynode(n->nfile.next);
+ break;
+ case NTOFD:
+ case NFROMFD:
+ new->ndup.vname = copynode(n->ndup.vname);
+ new->ndup.dupfd = n->ndup.dupfd;
+ new->ndup.fd = n->ndup.fd;
+ new->ndup.next = copynode(n->ndup.next);
+ break;
+ case NHERE:
+ case NXHERE:
+ new->nhere.doc = copynode(n->nhere.doc);
+ new->nhere.fd = n->nhere.fd;
+ new->nhere.next = copynode(n->nhere.next);
+ break;
+ case NNOT:
+ new->nnot.com = copynode(n->nnot.com);
+ break;
+ };
+ new->type = n->type;
+ return new;
+}
+
+
+static struct nodelist *
+copynodelist(lp)
+ struct nodelist *lp;
+{
+ struct nodelist *start;
+ struct nodelist **lpp;
+
+ lpp = &start;
+ while (lp) {
+ *lpp = funcblock;
+ funcblock = (char *) funcblock + ALIGN(sizeof(struct nodelist));
+ (*lpp)->n = copynode(lp->n);
+ lp = lp->next;
+ lpp = &(*lpp)->next;
+ }
+ *lpp = NULL;
+ return start;
+}
+
+
+
+static char *
+nodesavestr(s)
+ char *s;
+{
+#ifdef _GNU_SOURCE
+ char *rtn = funcstring;
+
+ funcstring = stpcpy(funcstring, s) + 1;
+ return rtn;
+#else
+ register char *p = s;
+ register char *q = funcstring;
+ char *rtn = funcstring;
+
+ while ((*q++ = *p++) != '\0')
+ continue;
+ funcstring = q;
+ return rtn;
+#endif
+}
+
+
+
+/*
+ * Free a parse tree.
+ */
+
+static void
+freefunc(n)
+ union node *n;
+{
+ if (n)
+ ckfree(n);
+}
+/* $NetBSD: options.c,v 1.31 2001/02/26 13:06:43 wiz Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+struct optent optlist[NOPTS] = {
+ { "errexit", 'e', 0 },
+ { "noglob", 'f', 0 },
+ { "ignoreeof", 'I', 0 },
+ { "interactive",'i', 0 },
+ { "monitor", 'm', 0 },
+ { "noexec", 'n', 0 },
+ { "stdin", 's', 0 },
+ { "xtrace", 'x', 0 },
+ { "verbose", 'v', 0 },
+ { "vi", 'V', 0 },
+ { "emacs", 'E', 0 },
+ { "noclobber", 'C', 0 },
+ { "allexport", 'a', 0 },
+ { "notify", 'b', 0 },
+ { "nounset", 'u', 0 },
+ { "quietprofile", 'q', 0 },
+};
+static char *arg0; /* value of $0 */
+struct shparam shellparam; /* current positional parameters */
+static char **argptr; /* argument list for builtin commands */
+static char *optionarg; /* set by nextopt (like getopt) */
+static char *optptr; /* used by nextopt */
+
+static char *minusc; /* argument to -c option */
+
+
+static void options __P((int));
+static void minus_o __P((char *, int));
+static void setoption __P((int, int));
+#ifdef ASH_GETOPTS
+static int getopts __P((char *, char *, char **, int *, int *));
+#endif
+
+
+/*
+ * Process the shell command line arguments.
+ */
+
+static void
+procargs(argc, argv)
+ int argc;
+ char **argv;
+{
+ int i;
+
+ argptr = argv;
+ if (argc > 0)
+ argptr++;
+ for (i = 0; i < NOPTS; i++)
+ optlist[i].val = 2;
+ options(1);
+ if (*argptr == NULL && minusc == NULL)
+ sflag = 1;
+ if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
+ iflag = 1;
+ if (mflag == 2)
+ mflag = iflag;
+ for (i = 0; i < NOPTS; i++)
+ if (optlist[i].val == 2)
+ optlist[i].val = 0;
+ arg0 = argv[0];
+ if (sflag == 0 && minusc == NULL) {
+ commandname = argv[0];
+ arg0 = *argptr++;
+ setinputfile(arg0, 0);
+ commandname = arg0;
+ }
+ /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
+ if (argptr && minusc && *argptr)
+ arg0 = *argptr++;
+
+ shellparam.p = argptr;
+ shellparam.optind = 1;
+ shellparam.optoff = -1;
+ /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
+ while (*argptr) {
+ shellparam.nparam++;
+ argptr++;
+ }
+ optschanged();
+}
+
+
+static void
+optschanged()
+{
+ setinteractive(iflag);
+ setjobctl(mflag);
+}
+
+/*
+ * Process shell options. The global variable argptr contains a pointer
+ * to the argument list; we advance it past the options.
+ */
+
+static void
+options(cmdline)
+ int cmdline;
+{
+ char *p;
+ int val;
+ int c;
+
+ if (cmdline)
+ minusc = NULL;
+ while ((p = *argptr) != NULL) {
+ argptr++;
+ if ((c = *p++) == '-') {
+ val = 1;
+ if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
+ if (!cmdline) {
+ /* "-" means turn off -x and -v */
+ if (p[0] == '\0')
+ xflag = vflag = 0;
+ /* "--" means reset params */
+ else if (*argptr == NULL)
+ setparam(argptr);
+ }
+ break; /* "-" or "--" terminates options */
+ }
+ } else if (c == '+') {
+ val = 0;
+ } else {
+ argptr--;
+ break;
+ }
+ while ((c = *p++) != '\0') {
+ if (c == 'c' && cmdline) {
+ char *q;
+#ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
+ if (*p == '\0')
+#endif
+ q = *argptr++;
+ if (q == NULL || minusc != NULL)
+ error("Bad -c option");
+ minusc = q;
+#ifdef NOHACK
+ break;
+#endif
+ } else if (c == 'o') {
+ minus_o(*argptr, val);
+ if (*argptr)
+ argptr++;
+ } else {
+ setoption(c, val);
+ }
+ }
+ }
+}
+
+static void
+minus_o(name, val)
+ char *name;
+ int val;
+{
+ int i;
+
+ if (name == NULL) {
+ out1str("Current option settings\n");
+ for (i = 0; i < NOPTS; i++)
+ out1fmt("%-16s%s\n", optlist[i].name,
+ optlist[i].val ? "on" : "off");
+ } else {
+ for (i = 0; i < NOPTS; i++)
+ if (equal(name, optlist[i].name)) {
+ setoption(optlist[i].letter, val);
+ return;
+ }
+ error("Illegal option -o %s", name);
+ }
+}
+
+
+static void
+setoption(flag, val)
+ char flag;
+ int val;
+ {
+ int i;
+
+ for (i = 0; i < NOPTS; i++)
+ if (optlist[i].letter == flag) {
+ optlist[i].val = val;
+ if (val) {
+ /* #%$ hack for ksh semantics */
+ if (flag == 'V')
+ Eflag = 0;
+ else if (flag == 'E')
+ Vflag = 0;
+ }
+ return;
+ }
+ error("Illegal option -%c", flag);
+ /* NOTREACHED */
+}
+
+
+
+#ifdef mkinit
+SHELLPROC {
+ int i;
+
+ for (i = 0; i < NOPTS; i++)
+ optlist[i].val = 0;
+ optschanged();
+
+}
+#endif
+
+
+/*
+ * Set the shell parameters.
+ */
+
+static void
+setparam(argv)
+ char **argv;
+ {
+ char **newparam;
+ char **ap;
+ int nparam;
+
+ for (nparam = 0 ; argv[nparam] ; nparam++);
+ ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
+ while (*argv) {
+ *ap++ = savestr(*argv++);
+ }
+ *ap = NULL;
+ freeparam(&shellparam);
+ shellparam.malloc = 1;
+ shellparam.nparam = nparam;
+ shellparam.p = newparam;
+ shellparam.optind = 1;
+ shellparam.optoff = -1;
+}
+
+
+/*
+ * Free the list of positional parameters.
+ */
+
+static void
+freeparam(param)
+ volatile struct shparam *param;
+ {
+ char **ap;
+
+ if (param->malloc) {
+ for (ap = param->p ; *ap ; ap++)
+ ckfree(*ap);
+ ckfree(param->p);
+ }
+}
+
+
+
+/*
+ * The shift builtin command.
+ */
+
+static int
+shiftcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int n;
+ char **ap1, **ap2;
+
+ n = 1;
+ if (argc > 1)
+ n = number(argv[1]);
+ if (n > shellparam.nparam)
+ error("can't shift that many");
+ INTOFF;
+ shellparam.nparam -= n;
+ for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
+ if (shellparam.malloc)
+ ckfree(*ap1);
+ }
+ ap2 = shellparam.p;
+ while ((*ap2++ = *ap1++) != NULL);
+ shellparam.optind = 1;
+ shellparam.optoff = -1;
+ INTON;
+ return 0;
+}
+
+
+
+/*
+ * The set command builtin.
+ */
+
+static int
+setcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ if (argc == 1)
+ return showvarscmd(argc, argv);
+ INTOFF;
+ options(0);
+ optschanged();
+ if (*argptr != NULL) {
+ setparam(argptr);
+ }
+ INTON;
+ return 0;
+}
+
+
+static void
+getoptsreset(value)
+ const char *value;
+{
+ shellparam.optind = number(value);
+ shellparam.optoff = -1;
+}
+
+#ifdef ASH_GETOPTS
+/*
+ * The getopts builtin. Shellparam.optnext points to the next argument
+ * to be processed. Shellparam.optptr points to the next character to
+ * be processed in the current argument. If shellparam.optnext is NULL,
+ * then it's the first time getopts has been called.
+ */
+
+static int
+getoptscmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char **optbase;
+
+ if (argc < 3)
+ error("Usage: getopts optstring var [arg]");
+ else if (argc == 3) {
+ optbase = shellparam.p;
+ if (shellparam.optind > shellparam.nparam + 1) {
+ shellparam.optind = 1;
+ shellparam.optoff = -1;
+ }
+ }
+ else {
+ optbase = &argv[3];
+ if (shellparam.optind > argc - 2) {
+ shellparam.optind = 1;
+ shellparam.optoff = -1;
+ }
+ }
+
+ return getopts(argv[1], argv[2], optbase, &shellparam.optind,
+ &shellparam.optoff);
+}
+
+/*
+ * Safe version of setvar, returns 1 on success 0 on failure.
+ */
+
+static int
+setvarsafe(name, val, flags)
+ const char *name, *val;
+ int flags;
+{
+ struct jmploc jmploc;
+ struct jmploc *volatile savehandler = handler;
+ int err = 0;
+#ifdef __GNUC__
+ (void) &err;
+#endif
+
+ if (setjmp(jmploc.loc))
+ err = 1;
+ else {
+ handler = &jmploc;
+ setvar(name, val, flags);
+ }
+ handler = savehandler;
+ return err;
+}
+
+static int
+getopts(optstr, optvar, optfirst, myoptind, optoff)
+ char *optstr;
+ char *optvar;
+ char **optfirst;
+ int *myoptind;
+ int *optoff;
+{
+ char *p, *q;
+ char c = '?';
+ int done = 0;
+ int err = 0;
+ char s[10];
+ char **optnext = optfirst + *myoptind - 1;
+
+ if (*myoptind <= 1 || *optoff < 0 || !(*(optnext - 1)) ||
+ strlen(*(optnext - 1)) < *optoff)
+ p = NULL;
+ else
+ p = *(optnext - 1) + *optoff;
+ if (p == NULL || *p == '\0') {
+ /* Current word is done, advance */
+ if (optnext == NULL)
+ return 1;
+ p = *optnext;
+ if (p == NULL || *p != '-' || *++p == '\0') {
+atend:
+ *myoptind = optnext - optfirst + 1;
+ p = NULL;
+ done = 1;
+ goto out;
+ }
+ optnext++;
+ if (p[0] == '-' && p[1] == '\0') /* check for "--" */
+ goto atend;
+ }
+
+ c = *p++;
+ for (q = optstr; *q != c; ) {
+ if (*q == '\0') {
+ if (optstr[0] == ':') {
+ s[0] = c;
+ s[1] = '\0';
+ err |= setvarsafe("OPTARG", s, 0);
+ }
+ else {
+ outfmt(&errout, "Illegal option -%c\n", c);
+ (void) unsetvar("OPTARG");
+ }
+ c = '?';
+ goto bad;
+ }
+ if (*++q == ':')
+ q++;
+ }
+
+ if (*++q == ':') {
+ if (*p == '\0' && (p = *optnext) == NULL) {
+ if (optstr[0] == ':') {
+ s[0] = c;
+ s[1] = '\0';
+ err |= setvarsafe("OPTARG", s, 0);
+ c = ':';
+ }
+ else {
+ outfmt(&errout, "No arg for -%c option\n", c);
+ (void) unsetvar("OPTARG");
+ c = '?';
+ }
+ goto bad;
+ }
+
+ if (p == *optnext)
+ optnext++;
+ setvarsafe("OPTARG", p, 0);
+ p = NULL;
+ }
+ else
+ setvarsafe("OPTARG", "", 0);
+ *myoptind = optnext - optfirst + 1;
+ goto out;
+
+bad:
+ *myoptind = 1;
+ p = NULL;
+out:
+ *optoff = p ? p - *(optnext - 1) : -1;
+ fmtstr(s, sizeof(s), "%d", *myoptind);
+ err |= setvarsafe("OPTIND", s, VNOFUNC);
+ s[0] = c;
+ s[1] = '\0';
+ err |= setvarsafe(optvar, s, 0);
+ if (err) {
+ *myoptind = 1;
+ *optoff = -1;
+ flushall();
+ exraise(EXERROR);
+ }
+ return done;
+}
+#endif
+
+/*
+ * XXX - should get rid of. have all builtins use getopt(3). the
+ * library getopt must have the BSD extension static variable "optreset"
+ * otherwise it can't be used within the shell safely.
+ *
+ * Standard option processing (a la getopt) for builtin routines. The
+ * only argument that is passed to nextopt is the option string; the
+ * other arguments are unnecessary. It return the character, or '\0' on
+ * end of input.
+ */
+
+static int
+nextopt(optstring)
+ const char *optstring;
+ {
+ char *p;
+ const char *q;
+ char c;
+
+ if ((p = optptr) == NULL || *p == '\0') {
+ p = *argptr;
+ if (p == NULL || *p != '-' || *++p == '\0')
+ return '\0';
+ argptr++;
+ if (p[0] == '-' && p[1] == '\0') /* check for "--" */
+ return '\0';
+ }
+ c = *p++;
+ for (q = optstring ; *q != c ; ) {
+ if (*q == '\0')
+ error("Illegal option -%c", c);
+ if (*++q == ':')
+ q++;
+ }
+ if (*++q == ':') {
+ if (*p == '\0' && (p = *argptr++) == NULL)
+ error("No arg for -%c option", c);
+ optionarg = p;
+ p = NULL;
+ }
+ optptr = p;
+ return c;
+}
+
+
+/* $NetBSD: output.c,v 1.23 2001/01/07 23:39:07 lukem Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Shell output routines. We use our own output routines because:
+ * When a builtin command is interrupted we have to discard
+ * any pending output.
+ * When a builtin command appears in back quotes, we want to
+ * save the output of the command in a region obtained
+ * via malloc, rather than doing a fork and reading the
+ * output of the command via a pipe.
+ * Our output routines may be smaller than the stdio routines.
+ */
+
+
+#define OUTBUFSIZ BUFSIZ
+#define MEM_OUT -3 /* output to dynamically allocated memory */
+
+
+#ifdef USE_GLIBC_STDIO
+struct output output = {NULL, NULL, 0, NULL, 0, 1, 0};
+struct output errout = {NULL, NULL, 0, NULL, 0, 2, 0};
+struct output memout = {NULL, NULL, 0, NULL, 0, MEM_OUT, 0};
+#else
+struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
+struct output errout = {NULL, 0, NULL, 0, 2, 0};
+struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
+#endif
+struct output *out1 = &output;
+struct output *out2 = &errout;
+
+
+#ifndef USE_GLIBC_STDIO
+static void __outstr __P((const char *, size_t, struct output*));
+#endif
+
+
+#ifdef mkinit
+
+INCLUDE "output.h"
+INCLUDE "memalloc.h"
+
+INIT {
+#ifdef USE_GLIBC_STDIO
+ initstreams();
+#endif
+}
+
+RESET {
+ out1 = &output;
+ out2 = &errout;
+#ifdef USE_GLIBC_STDIO
+ if (memout.stream != NULL)
+ __closememout();
+#endif
+ if (memout.buf != NULL) {
+ ckfree(memout.buf);
+ memout.buf = NULL;
+ }
+}
+
+#endif
+
+
+#ifndef USE_GLIBC_STDIO
+static void
+__outstr(const char *p, size_t len, struct output *dest) {
+ if (!dest->bufsize) {
+ dest->nleft = 0;
+ } else if (dest->buf == NULL) {
+ if (len > dest->bufsize && dest->fd == MEM_OUT) {
+ dest->bufsize = len;
+ }
+ INTOFF;
+ dest->buf = ckmalloc(dest->bufsize);
+ dest->nextc = dest->buf;
+ dest->nleft = dest->bufsize;
+ INTON;
+ } else if (dest->fd == MEM_OUT) {
+ int offset;
+
+ offset = dest->bufsize;
+ INTOFF;
+ if (dest->bufsize >= len) {
+ dest->bufsize <<= 1;
+ } else {
+ dest->bufsize += len;
+ }
+ dest->buf = ckrealloc(dest->buf, dest->bufsize);
+ dest->nleft = dest->bufsize - offset;
+ dest->nextc = dest->buf + offset;
+ INTON;
+ } else {
+ flushout(dest);
+ }
+
+ if (len < dest->nleft) {
+ dest->nleft -= len;
+ memcpy(dest->nextc, p, len);
+ dest->nextc += len;
+ return;
+ }
+
+ if (xwrite(dest->fd, p, len) < len)
+ dest->flags |= OUTPUT_ERR;
+}
+#endif
+
+
+static void
+outstr(p, file)
+ const char *p;
+ struct output *file;
+ {
+#ifdef USE_GLIBC_STDIO
+ INTOFF;
+ fputs(p, file->stream);
+ INTON;
+#else
+ size_t len;
+
+ if (!*p) {
+ return;
+ }
+ len = strlen(p);
+ if ((file->nleft -= len) > 0) {
+ memcpy(file->nextc, p, len);
+ file->nextc += len;
+ return;
+ }
+ __outstr(p, len, file);
+#endif
+}
+
+
+#ifndef USE_GLIBC_STDIO
+
+
+static void
+outcslow(c, dest)
+ char c;
+ struct output *dest;
+ {
+ __outstr(&c, 1, dest);
+}
+#endif
+
+
+static void
+flushall() {
+ flushout(&output);
+#ifdef FLUSHERR
+ flushout(&errout);
+#endif
+}
+
+
+static void
+flushout(dest)
+ struct output *dest;
+ {
+#ifdef USE_GLIBC_STDIO
+ INTOFF;
+ fflush(dest->stream);
+ INTON;
+#else
+ size_t len;
+
+ len = dest->nextc - dest->buf;
+ if (dest->buf == NULL || !len || dest->fd < 0)
+ return;
+ dest->nextc = dest->buf;
+ dest->nleft = dest->bufsize;
+ if (xwrite(dest->fd, dest->buf, len) < len)
+ dest->flags |= OUTPUT_ERR;
+#endif
+}
+
+
+static void
+freestdout() {
+ if (output.buf) {
+ INTOFF;
+ ckfree(output.buf);
+ output.buf = NULL;
+ output.nleft = 0;
+ INTON;
+ }
+ output.flags = 0;
+}
+
+
+static void
+#ifdef __STDC__
+outfmt(struct output *file, const char *fmt, ...)
+#else
+static void
+outfmt(va_alist)
+ va_dcl
+#endif
+{
+ va_list ap;
+#ifndef __STDC__
+ struct output *file;
+ const char *fmt;
+
+ va_start(ap);
+ file = va_arg(ap, struct output *);
+ fmt = va_arg(ap, const char *);
+#else
+ va_start(ap, fmt);
+#endif
+ doformat(file, fmt, ap);
+ va_end(ap);
+}
+
+
+static void
+#ifdef __STDC__
+out1fmt(const char *fmt, ...)
+#else
+out1fmt(va_alist)
+ va_dcl
+#endif
+{
+ va_list ap;
+#ifndef __STDC__
+ const char *fmt;
+
+ va_start(ap);
+ fmt = va_arg(ap, const char *);
+#else
+ va_start(ap, fmt);
+#endif
+ doformat(out1, fmt, ap);
+ va_end(ap);
+}
+
+static void
+#ifdef __STDC__
+fmtstr(char *outbuf, size_t length, const char *fmt, ...)
+#else
+fmtstr(va_alist)
+ va_dcl
+#endif
+{
+ va_list ap;
+#ifndef __STDC__
+ char *outbuf;
+ size_t length;
+ const char *fmt;
+
+ va_start(ap);
+ outbuf = va_arg(ap, char *);
+ length = va_arg(ap, size_t);
+ fmt = va_arg(ap, const char *);
+#else
+ va_start(ap, fmt);
+#endif
+ INTOFF;
+ vsnprintf(outbuf, length, fmt, ap);
+ INTON;
+}
+
+#ifndef USE_GLIBC_STDIO
+/*
+ * Formatted output. This routine handles a subset of the printf formats:
+ * - Formats supported: d, u, o, p, X, s, and c.
+ * - The x format is also accepted but is treated like X.
+ * - The l, ll and q modifiers are accepted.
+ * - The - and # flags are accepted; # only works with the o format.
+ * - Width and precision may be specified with any format except c.
+ * - An * may be given for the width or precision.
+ * - The obsolete practice of preceding the width with a zero to get
+ * zero padding is not supported; use the precision field.
+ * - A % may be printed by writing %% in the format string.
+ */
+
+#define TEMPSIZE 24
+
+#ifdef BSD4_4
+#define HAVE_VASPRINTF 1
+#endif
+
+#if !HAVE_VASPRINTF
+static const char digit[] = "0123456789ABCDEF";
+#endif
+
+
+static void
+doformat(dest, f, ap)
+ struct output *dest;
+ const char *f; /* format string */
+ va_list ap;
+{
+#if HAVE_VASPRINTF
+ char *s, *t;
+ int len;
+
+ INTOFF;
+ len = vasprintf(&t, f, ap);
+ if (len < 0) {
+ return;
+ }
+ s = stalloc(++len);
+ memcpy(s, t, len);
+ free(t);
+ INTON;
+ outstr(s, dest);
+ stunalloc(s);
+#else /* !HAVE_VASPRINTF */
+ char c;
+ char temp[TEMPSIZE];
+ int flushleft;
+ int sharp;
+ int width;
+ int prec;
+ int islong;
+ int isquad;
+ char *p;
+ int sign;
+#ifdef BSD4_4
+ quad_t l;
+ u_quad_t num;
+#else
+ long l;
+ u_long num;
+#endif
+ unsigned base;
+ int len;
+ int size;
+ int pad;
+
+ while ((c = *f++) != '\0') {
+ if (c != '%') {
+ outc(c, dest);
+ continue;
+ }
+ flushleft = 0;
+ sharp = 0;
+ width = 0;
+ prec = -1;
+ islong = 0;
+ isquad = 0;
+ for (;;) {
+ if (*f == '-')
+ flushleft++;
+ else if (*f == '#')
+ sharp++;
+ else
+ break;
+ f++;
+ }
+ if (*f == '*') {
+ width = va_arg(ap, int);
+ f++;
+ } else {
+ while (is_digit(*f)) {
+ width = 10 * width + digit_val(*f++);
+ }
+ }
+ if (*f == '.') {
+ if (*++f == '*') {
+ prec = va_arg(ap, int);
+ f++;
+ } else {
+ prec = 0;
+ while (is_digit(*f)) {
+ prec = 10 * prec + digit_val(*f++);
+ }
+ }
+ }
+ if (*f == 'l') {
+ f++;
+ if (*f == 'l') {
+ isquad++;
+ f++;
+ } else
+ islong++;
+ } else if (*f == 'q') {
+ isquad++;
+ f++;
+ }
+ switch (*f) {
+ case 'd':
+#ifdef BSD4_4
+ if (isquad)
+ l = va_arg(ap, quad_t);
+ else
+#endif
+ if (islong)
+ l = va_arg(ap, long);
+ else
+ l = va_arg(ap, int);
+ sign = 0;
+ num = l;
+ if (l < 0) {
+ num = -l;
+ sign = 1;
+ }
+ base = 10;
+ goto number;
+ case 'u':
+ base = 10;
+ goto uns_number;
+ case 'o':
+ base = 8;
+ goto uns_number;
+ case 'p':
+ outc('0', dest);
+ outc('x', dest);
+ /*FALLTHROUGH*/
+ case 'x':
+ /* we don't implement 'x'; treat like 'X' */
+ case 'X':
+ base = 16;
+uns_number: /* an unsigned number */
+ sign = 0;
+#ifdef BSD4_4
+ if (isquad)
+ num = va_arg(ap, u_quad_t);
+ else
+#endif
+ if (islong)
+ num = va_arg(ap, unsigned long);
+ else
+ num = va_arg(ap, unsigned int);
+number: /* process a number */
+ p = temp + TEMPSIZE - 1;
+ *p = '\0';
+ while (num) {
+ *--p = digit[num % base];
+ num /= base;
+ }
+ len = (temp + TEMPSIZE - 1) - p;
+ if (prec < 0)
+ prec = 1;
+ if (sharp && *f == 'o' && prec <= len)
+ prec = len + 1;
+ pad = 0;
+ if (width) {
+ size = len;
+ if (size < prec)
+ size = prec;
+ size += sign;
+ pad = width - size;
+ if (flushleft == 0) {
+ while (--pad >= 0)
+ outc(' ', dest);
+ }
+ }
+ if (sign)
+ outc('-', dest);
+ prec -= len;
+ while (--prec >= 0)
+ outc('0', dest);
+ while (*p)
+ outc(*p++, dest);
+ while (--pad >= 0)
+ outc(' ', dest);
+ break;
+ case 's':
+ p = va_arg(ap, char *);
+ pad = 0;
+ if (width) {
+ len = strlen(p);
+ if (prec >= 0 && len > prec)
+ len = prec;
+ pad = width - len;
+ if (flushleft == 0) {
+ while (--pad >= 0)
+ outc(' ', dest);
+ }
+ }
+ prec++;
+ while (--prec != 0 && *p)
+ outc(*p++, dest);
+ while (--pad >= 0)
+ outc(' ', dest);
+ break;
+ case 'c':
+ c = va_arg(ap, int);
+ outc(c, dest);
+ break;
+ default:
+ outc(*f, dest);
+ break;
+ }
+ f++;
+ }
+#endif /* !HAVE_VASPRINTF */
+}
+#endif
+
+
+
+/*
+ * Version of write which resumes after a signal is caught.
+ */
+
+static int
+xwrite(fd, buf, nbytes)
+ int fd;
+ const char *buf;
+ int nbytes;
+ {
+ int ntry;
+ int i;
+ int n;
+
+ n = nbytes;
+ ntry = 0;
+ for (;;) {
+ i = write(fd, buf, n);
+ if (i > 0) {
+ if ((n -= i) <= 0)
+ return nbytes;
+ buf += i;
+ ntry = 0;
+ } else if (i == 0) {
+ if (++ntry > 10)
+ return nbytes - n;
+ } else if (errno != EINTR) {
+ return -1;
+ }
+ }
+}
+
+
+#ifdef notdef
+/*
+ * Version of ioctl that retries after a signal is caught.
+ * XXX unused function
+ */
+
+static int
+xioctl(fd, request, arg)
+ int fd;
+ unsigned long request;
+ char * arg;
+{
+ int i;
+
+ while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
+ return i;
+}
+#endif
+
+
+#ifdef USE_GLIBC_STDIO
+static void initstreams() {
+ output.stream = stdout;
+ errout.stream = stderr;
+}
+
+
+static void
+openmemout() {
+ INTOFF;
+ memout.stream = open_memstream(&memout.buf, &memout.bufsize);
+ INTON;
+}
+
+
+static int
+__closememout() {
+ int error;
+ error = fclose(memout.stream);
+ memout.stream = NULL;
+ return error;
+}
+#endif
+/* $NetBSD: parser.c,v 1.46 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+/*
+ * Shell command parser.
+ */
+
+#define EOFMARKLEN 79
+
+
+
+struct heredoc {
+ struct heredoc *next; /* next here document in list */
+ union node *here; /* redirection node */
+ char *eofmark; /* string indicating end of input */
+ int striptabs; /* if set, strip leading tabs */
+};
+
+
+
+struct heredoc *heredoclist; /* list of here documents to read */
+static int parsebackquote; /* nonzero if we are inside backquotes */
+static int doprompt; /* if set, prompt the user */
+static int needprompt; /* true if interactive and at start of line */
+static int lasttoken; /* last token read */
+static int tokpushback; /* last token pushed back */
+static char *wordtext; /* text of last word returned by readtoken */
+static int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
+/* 1 == check for aliases, 2 == also check for assignments */
+static int checkalias;
+struct nodelist *backquotelist;
+union node *redirnode;
+struct heredoc *heredoc;
+static int quoteflag; /* set if (part of) last token was quoted */
+static int startlinno; /* line # where last token started */
+
+
+static union node *list __P((int));
+static union node *andor __P((void));
+static union node *pipeline __P((void));
+static union node *command __P((void));
+static union node *simplecmd __P((void));
+static union node *makename __P((void));
+static void parsefname __P((void));
+static void parseheredoc __P((void));
+static int peektoken __P((void));
+static int readtoken __P((void));
+static int xxreadtoken __P((void));
+static int readtoken1 __P((int, char const *, char *, int));
+static int noexpand __P((char *));
+static void synexpect __P((int)) __attribute__((noreturn));
+static void synerror __P((const char *)) __attribute__((noreturn));
+static void setprompt __P((int));
+
+
+/*
+ * Read and parse a command. Returns NEOF on end of file. (NULL is a
+ * valid parse tree indicating a blank line.)
+ */
+
+union node *
+parsecmd(int interact)
+{
+ int t;
+
+ tokpushback = 0;
+ doprompt = interact;
+ if (doprompt)
+ setprompt(1);
+ else
+ setprompt(0);
+ needprompt = 0;
+ t = readtoken();
+ if (t == TEOF)
+ return NEOF;
+ if (t == TNL)
+ return NULL;
+ tokpushback++;
+ return list(1);
+}
+
+
+static union node *
+list(nlflag)
+ int nlflag;
+{
+ union node *n1, *n2, *n3;
+ int tok;
+
+ checkkwd = 2;
+ if (nlflag == 0 && tokendlist[peektoken()])
+ return NULL;
+ n1 = NULL;
+ for (;;) {
+ n2 = andor();
+ tok = readtoken();
+ if (tok == TBACKGND) {
+ if (n2->type == NCMD || n2->type == NPIPE) {
+ n2->ncmd.backgnd = 1;
+ } else if (n2->type == NREDIR) {
+ n2->type = NBACKGND;
+ } else {
+ n3 = (union node *)stalloc(sizeof (struct nredir));
+ n3->type = NBACKGND;
+ n3->nredir.n = n2;
+ n3->nredir.redirect = NULL;
+ n2 = n3;
+ }
+ }
+ if (n1 == NULL) {
+ n1 = n2;
+ }
+ else {
+ n3 = (union node *)stalloc(sizeof (struct nbinary));
+ n3->type = NSEMI;
+ n3->nbinary.ch1 = n1;
+ n3->nbinary.ch2 = n2;
+ n1 = n3;
+ }
+ switch (tok) {
+ case TBACKGND:
+ case TSEMI:
+ tok = readtoken();
+ /* fall through */
+ case TNL:
+ if (tok == TNL) {
+ parseheredoc();
+ if (nlflag)
+ return n1;
+ } else {
+ tokpushback++;
+ }
+ checkkwd = 2;
+ if (tokendlist[peektoken()])
+ return n1;
+ break;
+ case TEOF:
+ if (heredoclist)
+ parseheredoc();
+ else
+ pungetc(); /* push back EOF on input */
+ return n1;
+ default:
+ if (nlflag)
+ synexpect(-1);
+ tokpushback++;
+ return n1;
+ }
+ }
+}
+
+
+
+static union node *
+andor() {
+ union node *n1, *n2, *n3;
+ int t;
+
+ checkkwd = 1;
+ n1 = pipeline();
+ for (;;) {
+ if ((t = readtoken()) == TAND) {
+ t = NAND;
+ } else if (t == TOR) {
+ t = NOR;
+ } else {
+ tokpushback++;
+ return n1;
+ }
+ checkkwd = 2;
+ n2 = pipeline();
+ n3 = (union node *)stalloc(sizeof (struct nbinary));
+ n3->type = t;
+ n3->nbinary.ch1 = n1;
+ n3->nbinary.ch2 = n2;
+ n1 = n3;
+ }
+}
+
+
+
+static union node *
+pipeline() {
+ union node *n1, *n2, *pipenode;
+ struct nodelist *lp, *prev;
+ int negate;
+
+ negate = 0;
+ TRACE(("pipeline: entered\n"));
+ if (readtoken() == TNOT) {
+ negate = !negate;
+ checkkwd = 1;
+ } else
+ tokpushback++;
+ n1 = command();
+ if (readtoken() == TPIPE) {
+ pipenode = (union node *)stalloc(sizeof (struct npipe));
+ pipenode->type = NPIPE;
+ pipenode->npipe.backgnd = 0;
+ lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
+ pipenode->npipe.cmdlist = lp;
+ lp->n = n1;
+ do {
+ prev = lp;
+ lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
+ checkkwd = 2;
+ lp->n = command();
+ prev->next = lp;
+ } while (readtoken() == TPIPE);
+ lp->next = NULL;
+ n1 = pipenode;
+ }
+ tokpushback++;
+ if (negate) {
+ n2 = (union node *)stalloc(sizeof (struct nnot));
+ n2->type = NNOT;
+ n2->nnot.com = n1;
+ return n2;
+ } else
+ return n1;
+}
+
+
+
+static union node *
+command() {
+ union node *n1, *n2;
+ union node *ap, **app;
+ union node *cp, **cpp;
+ union node *redir, **rpp;
+ int t;
+
+ redir = NULL;
+ n1 = NULL;
+ rpp = &redir;
+
+ switch (readtoken()) {
+ case TIF:
+ n1 = (union node *)stalloc(sizeof (struct nif));
+ n1->type = NIF;
+ n1->nif.test = list(0);
+ if (readtoken() != TTHEN)
+ synexpect(TTHEN);
+ n1->nif.ifpart = list(0);
+ n2 = n1;
+ while (readtoken() == TELIF) {
+ n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
+ n2 = n2->nif.elsepart;
+ n2->type = NIF;
+ n2->nif.test = list(0);
+ if (readtoken() != TTHEN)
+ synexpect(TTHEN);
+ n2->nif.ifpart = list(0);
+ }
+ if (lasttoken == TELSE)
+ n2->nif.elsepart = list(0);
+ else {
+ n2->nif.elsepart = NULL;
+ tokpushback++;
+ }
+ if (readtoken() != TFI)
+ synexpect(TFI);
+ checkkwd = 1;
+ break;
+ case TWHILE:
+ case TUNTIL: {
+ int got;
+ n1 = (union node *)stalloc(sizeof (struct nbinary));
+ n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
+ n1->nbinary.ch1 = list(0);
+ if ((got=readtoken()) != TDO) {
+TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : ""));
+ synexpect(TDO);
+ }
+ n1->nbinary.ch2 = list(0);
+ if (readtoken() != TDONE)
+ synexpect(TDONE);
+ checkkwd = 1;
+ break;
+ }
+ case TFOR:
+ if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
+ synerror("Bad for loop variable");
+ n1 = (union node *)stalloc(sizeof (struct nfor));
+ n1->type = NFOR;
+ n1->nfor.var = wordtext;
+ checkkwd = 1;
+ if (readtoken() == TIN) {
+ app = ≈
+ while (readtoken() == TWORD) {
+ n2 = (union node *)stalloc(sizeof (struct narg));
+ n2->type = NARG;
+ n2->narg.text = wordtext;
+ n2->narg.backquote = backquotelist;
+ *app = n2;
+ app = &n2->narg.next;
+ }
+ *app = NULL;
+ n1->nfor.args = ap;
+ if (lasttoken != TNL && lasttoken != TSEMI)
+ synexpect(-1);
+ } else {
+ static char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE,
+ '@', '=', '\0'};
+ n2 = (union node *)stalloc(sizeof (struct narg));
+ n2->type = NARG;
+ n2->narg.text = argvars;
+ n2->narg.backquote = NULL;
+ n2->narg.next = NULL;
+ n1->nfor.args = n2;
+ /*
+ * Newline or semicolon here is optional (but note
+ * that the original Bourne shell only allowed NL).
+ */
+ if (lasttoken != TNL && lasttoken != TSEMI)
+ tokpushback++;
+ }
+ checkkwd = 2;
+ if (readtoken() != TDO)
+ synexpect(TDO);
+ n1->nfor.body = list(0);
+ if (readtoken() != TDONE)
+ synexpect(TDONE);
+ checkkwd = 1;
+ break;
+ case TCASE:
+ n1 = (union node *)stalloc(sizeof (struct ncase));
+ n1->type = NCASE;
+ if (readtoken() != TWORD)
+ synexpect(TWORD);
+ n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
+ n2->type = NARG;
+ n2->narg.text = wordtext;
+ n2->narg.backquote = backquotelist;
+ n2->narg.next = NULL;
+ do {
+ checkkwd = 1;
+ } while (readtoken() == TNL);
+ if (lasttoken != TIN)
+ synerror("expecting \"in\"");
+ cpp = &n1->ncase.cases;
+ checkkwd = 2, readtoken();
+ do {
+ if (lasttoken == TLP)
+ readtoken();
+ *cpp = cp = (union node *)stalloc(sizeof (struct nclist));
+ cp->type = NCLIST;
+ app = &cp->nclist.pattern;
+ for (;;) {
+ *app = ap = (union node *)stalloc(sizeof (struct narg));
+ ap->type = NARG;
+ ap->narg.text = wordtext;
+ ap->narg.backquote = backquotelist;
+ if (checkkwd = 2, readtoken() != TPIPE)
+ break;
+ app = &ap->narg.next;
+ readtoken();
+ }
+ ap->narg.next = NULL;
+ if (lasttoken != TRP)
+ synexpect(TRP);
+ cp->nclist.body = list(0);
+
+ checkkwd = 2;
+ if ((t = readtoken()) != TESAC) {
+ if (t != TENDCASE)
+ synexpect(TENDCASE);
+ else
+ checkkwd = 2, readtoken();
+ }
+ cpp = &cp->nclist.next;
+ } while(lasttoken != TESAC);
+ *cpp = NULL;
+ checkkwd = 1;
+ break;
+ case TLP:
+ n1 = (union node *)stalloc(sizeof (struct nredir));
+ n1->type = NSUBSHELL;
+ n1->nredir.n = list(0);
+ n1->nredir.redirect = NULL;
+ if (readtoken() != TRP)
+ synexpect(TRP);
+ checkkwd = 1;
+ break;
+ case TBEGIN:
+ n1 = list(0);
+ if (readtoken() != TEND)
+ synexpect(TEND);
+ checkkwd = 1;
+ break;
+ /* Handle an empty command like other simple commands. */
+ case TSEMI:
+ case TAND:
+ case TOR:
+ case TNL:
+ case TEOF:
+ case TRP:
+ case TBACKGND:
+ /*
+ * An empty command before a ; doesn't make much sense, and
+ * should certainly be disallowed in the case of `if ;'.
+ */
+ if (!redir)
+ synexpect(-1);
+ case TWORD:
+ case TREDIR:
+ tokpushback++;
+ n1 = simplecmd();
+ return n1;
+ default:
+ synexpect(-1);
+ /* NOTREACHED */
+ }
+
+ /* Now check for redirection which may follow command */
+ while (readtoken() == TREDIR) {
+ *rpp = n2 = redirnode;
+ rpp = &n2->nfile.next;
+ parsefname();
+ }
+ tokpushback++;
+ *rpp = NULL;
+ if (redir) {
+ if (n1->type != NSUBSHELL) {
+ n2 = (union node *)stalloc(sizeof (struct nredir));
+ n2->type = NREDIR;
+ n2->nredir.n = n1;
+ n1 = n2;
+ }
+ n1->nredir.redirect = redir;
+ }
+
+ return n1;
+}
+
+
+static union node *
+simplecmd() {
+ union node *args, **app;
+ union node *n = NULL;
+ union node *vars, **vpp;
+ union node **rpp, *redir;
+
+ args = NULL;
+ app = &args;
+ vars = NULL;
+ vpp = &vars;
+ redir = NULL;
+ rpp = &redir;
+
+ checkalias = 2;
+ for (;;) {
+ switch (readtoken()) {
+ case TWORD:
+ case TASSIGN:
+ n = (union node *)stalloc(sizeof (struct narg));
+ n->type = NARG;
+ n->narg.text = wordtext;
+ n->narg.backquote = backquotelist;
+ if (lasttoken == TWORD) {
+ *app = n;
+ app = &n->narg.next;
+ } else {
+ *vpp = n;
+ vpp = &n->narg.next;
+ }
+ break;
+ case TREDIR:
+ *rpp = n = redirnode;
+ rpp = &n->nfile.next;
+ parsefname(); /* read name of redirection file */
+ break;
+ case TLP:
+ if (
+ args && app == &args->narg.next &&
+ !vars && !redir
+ ) {
+ /* We have a function */
+ if (readtoken() != TRP)
+ synexpect(TRP);
+#ifdef notdef
+ if (! goodname(n->narg.text))
+ synerror("Bad function name");
+#endif
+ n->type = NDEFUN;
+ checkkwd = 2;
+ n->narg.next = command();
+ return n;
+ }
+ /* fall through */
+ default:
+ tokpushback++;
+ goto out;
+ }
+ }
+out:
+ *app = NULL;
+ *vpp = NULL;
+ *rpp = NULL;
+ n = (union node *)stalloc(sizeof (struct ncmd));
+ n->type = NCMD;
+ n->ncmd.backgnd = 0;
+ n->ncmd.args = args;
+ n->ncmd.assign = vars;
+ n->ncmd.redirect = redir;
+ return n;
+}
+
+static union node *
+makename() {
+ union node *n;
+
+ n = (union node *)stalloc(sizeof (struct narg));
+ n->type = NARG;
+ n->narg.next = NULL;
+ n->narg.text = wordtext;
+ n->narg.backquote = backquotelist;
+ return n;
+}
+
+static void fixredir(union node *n, const char *text, int err)
+ {
+ TRACE(("Fix redir %s %d\n", text, err));
+ if (!err)
+ n->ndup.vname = NULL;
+
+ if (is_digit(text[0]) && text[1] == '\0')
+ n->ndup.dupfd = digit_val(text[0]);
+ else if (text[0] == '-' && text[1] == '\0')
+ n->ndup.dupfd = -1;
+ else {
+
+ if (err)
+ synerror("Bad fd number");
+ else
+ n->ndup.vname = makename();
+ }
+}
+
+
+static void
+parsefname() {
+ union node *n = redirnode;
+
+ if (readtoken() != TWORD)
+ synexpect(-1);
+ if (n->type == NHERE) {
+ struct heredoc *here = heredoc;
+ struct heredoc *p;
+ int i;
+
+ if (quoteflag == 0)
+ n->type = NXHERE;
+ TRACE(("Here document %d\n", n->type));
+ if (here->striptabs) {
+ while (*wordtext == '\t')
+ wordtext++;
+ }
+ if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
+ synerror("Illegal eof marker for << redirection");
+ rmescapes(wordtext);
+ here->eofmark = wordtext;
+ here->next = NULL;
+ if (heredoclist == NULL)
+ heredoclist = here;
+ else {
+ for (p = heredoclist ; p->next ; p = p->next);
+ p->next = here;
+ }
+ } else if (n->type == NTOFD || n->type == NFROMFD) {
+ fixredir(n, wordtext, 0);
+ } else {
+ n->nfile.fname = makename();
+ }
+}
+
+
+/*
+ * Input any here documents.
+ */
+
+static void
+parseheredoc() {
+ struct heredoc *here;
+ union node *n;
+
+ while (heredoclist) {
+ here = heredoclist;
+ heredoclist = here->next;
+ if (needprompt) {
+ setprompt(2);
+ needprompt = 0;
+ }
+ readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
+ here->eofmark, here->striptabs);
+ n = (union node *)stalloc(sizeof (struct narg));
+ n->narg.type = NARG;
+ n->narg.next = NULL;
+ n->narg.text = wordtext;
+ n->narg.backquote = backquotelist;
+ here->here->nhere.doc = n;
+ }
+}
+
+static int
+peektoken() {
+ int t;
+
+ t = readtoken();
+ tokpushback++;
+ return (t);
+}
+
+static int
+readtoken() {
+ int t;
+ int savecheckkwd = checkkwd;
+ int savecheckalias = checkalias;
+ struct alias *ap;
+#ifdef DEBUG
+ int alreadyseen = tokpushback;
+#endif
+
+top:
+ t = xxreadtoken();
+ checkalias = savecheckalias;
+
+ if (checkkwd) {
+ /*
+ * eat newlines
+ */
+ if (checkkwd == 2) {
+ checkkwd = 0;
+ while (t == TNL) {
+ parseheredoc();
+ t = xxreadtoken();
+ }
+ }
+ checkkwd = 0;
+ /*
+ * check for keywords
+ */
+ if (t == TWORD && !quoteflag)
+ {
+ const char *const *pp;
+
+ if ((pp = findkwd(wordtext))) {
+ lasttoken = t = pp - parsekwd + KWDOFFSET;
+ TRACE(("keyword %s recognized\n", tokname[t]));
+ goto out;
+ }
+ }
+ }
+
+ if (t != TWORD) {
+ if (t != TREDIR) {
+ checkalias = 0;
+ }
+ } else if (checkalias == 2 && isassignment(wordtext)) {
+ lasttoken = t = TASSIGN;
+ } else if (checkalias) {
+ if (!quoteflag && (ap = lookupalias(wordtext, 1)) != NULL) {
+ if (*ap->val) {
+ pushstring(ap->val, strlen(ap->val), ap);
+ }
+ checkkwd = savecheckkwd;
+ goto top;
+ }
+ checkalias = 0;
+ }
+out:
+#ifdef DEBUG
+ if (!alreadyseen)
+ TRACE(("token %s %s\n", tokname[t], t == TWORD || t == TASSIGN ? wordtext : ""));
+ else
+ TRACE(("reread token %s %s\n", tokname[t], t == TWORD || t == TASSIGN ? wordtext : ""));
+#endif
+ return (t);
+}
+
+
+/*
+ * Read the next input token.
+ * If the token is a word, we set backquotelist to the list of cmds in
+ * backquotes. We set quoteflag to true if any part of the word was
+ * quoted.
+ * If the token is TREDIR, then we set redirnode to a structure containing
+ * the redirection.
+ * In all cases, the variable startlinno is set to the number of the line
+ * on which the token starts.
+ *
+ * [Change comment: here documents and internal procedures]
+ * [Readtoken shouldn't have any arguments. Perhaps we should make the
+ * word parsing code into a separate routine. In this case, readtoken
+ * doesn't need to have any internal procedures, but parseword does.
+ * We could also make parseoperator in essence the main routine, and
+ * have parseword (readtoken1?) handle both words and redirection.]
+ */
+
+#define RETURN(token) return lasttoken = token
+
+static int
+xxreadtoken() {
+ int c;
+
+ if (tokpushback) {
+ tokpushback = 0;
+ return lasttoken;
+ }
+ if (needprompt) {
+ setprompt(2);
+ needprompt = 0;
+ }
+ startlinno = plinno;
+ for (;;) { /* until token or start of word found */
+ c = pgetc_macro();
+ switch (c) {
+ case ' ': case '\t':
+ case PEOA:
+ continue;
+ case '#':
+ while ((c = pgetc()) != '\n' && c != PEOF);
+ pungetc();
+ continue;
+ case '\\':
+ if (pgetc() == '\n') {
+ startlinno = ++plinno;
+ if (doprompt)
+ setprompt(2);
+ else
+ setprompt(0);
+ continue;
+ }
+ pungetc();
+ goto breakloop;
+ case '\n':
+ plinno++;
+ needprompt = doprompt;
+ RETURN(TNL);
+ case PEOF:
+ RETURN(TEOF);
+ case '&':
+ if (pgetc() == '&')
+ RETURN(TAND);
+ pungetc();
+ RETURN(TBACKGND);
+ case '|':
+ if (pgetc() == '|')
+ RETURN(TOR);
+ pungetc();
+ RETURN(TPIPE);
+ case ';':
+ if (pgetc() == ';')
+ RETURN(TENDCASE);
+ pungetc();
+ RETURN(TSEMI);
+ case '(':
+ RETURN(TLP);
+ case ')':
+ RETURN(TRP);
+ default:
+ goto breakloop;
+ }
+ }
+breakloop:
+ return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
+#undef RETURN
+}
+
+
+
+/*
+ * If eofmark is NULL, read a word or a redirection symbol. If eofmark
+ * is not NULL, read a here document. In the latter case, eofmark is the
+ * word which marks the end of the document and striptabs is true if
+ * leading tabs should be stripped from the document. The argument firstc
+ * is the first character of the input token or document.
+ *
+ * Because C does not have internal subroutines, I have simulated them
+ * using goto's to implement the subroutine linkage. The following macros
+ * will run code that appears at the end of readtoken1.
+ */
+
+#define CHECKEND() {goto checkend; checkend_return:;}
+#define PARSEREDIR() {goto parseredir; parseredir_return:;}
+#define PARSESUB() {goto parsesub; parsesub_return:;}
+#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
+#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
+#define PARSEARITH() {goto parsearith; parsearith_return:;}
+
+static int
+readtoken1(firstc, syntax, eofmark, striptabs)
+ int firstc;
+ char const *syntax;
+ char *eofmark;
+ int striptabs;
+ {
+ int c = firstc;
+ char *out;
+ int len;
+ char line[EOFMARKLEN + 1];
+ struct nodelist *bqlist;
+ int quotef;
+ int dblquote;
+ int varnest; /* levels of variables expansion */
+ int arinest; /* levels of arithmetic expansion */
+ int parenlevel; /* levels of parens in arithmetic */
+ int dqvarnest; /* levels of variables expansion within double quotes */
+ int oldstyle;
+ char const *prevsyntax; /* syntax before arithmetic */
+#if __GNUC__
+ /* Avoid longjmp clobbering */
+ (void) &out;
+ (void) "ef;
+ (void) &dblquote;
+ (void) &varnest;
+ (void) &arinest;
+ (void) &parenlevel;
+ (void) &dqvarnest;
+ (void) &oldstyle;
+ (void) &prevsyntax;
+ (void) &syntax;
+#endif
+
+ startlinno = plinno;
+ dblquote = 0;
+ if (syntax == DQSYNTAX)
+ dblquote = 1;
+ quotef = 0;
+ bqlist = NULL;
+ varnest = 0;
+ arinest = 0;
+ parenlevel = 0;
+ dqvarnest = 0;
+
+ STARTSTACKSTR(out);
+ loop: { /* for each line, until end of word */
+#if ATTY
+ if (c == '\034' && doprompt
+ && attyset() && ! equal(termval(), "emacs")) {
+ attyline();
+ if (syntax == BASESYNTAX)
+ return readtoken();
+ c = pgetc();
+ goto loop;
+ }
+#endif
+ CHECKEND(); /* set c to PEOF if at end of here document */
+ for (;;) { /* until end of line or end of word */
+ CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */
+ switch(syntax[c]) {
+ case CNL: /* '\n' */
+ if (syntax == BASESYNTAX)
+ goto endword; /* exit outer loop */
+ USTPUTC(c, out);
+ plinno++;
+ if (doprompt)
+ setprompt(2);
+ else
+ setprompt(0);
+ c = pgetc();
+ goto loop; /* continue outer loop */
+ case CWORD:
+ USTPUTC(c, out);
+ break;
+ case CCTL:
+ if ((eofmark == NULL || dblquote) &&
+ dqvarnest == 0)
+ USTPUTC(CTLESC, out);
+ USTPUTC(c, out);
+ break;
+ case CBACK: /* backslash */
+ c = pgetc2();
+ if (c == PEOF) {
+ USTPUTC('\\', out);
+ pungetc();
+ } else if (c == '\n') {
+ if (doprompt)
+ setprompt(2);
+ else
+ setprompt(0);
+ } else {
+ if (dblquote && c != '\\' && c != '`' && c != '$'
+ && (c != '"' || eofmark != NULL))
+ USTPUTC('\\', out);
+ if (SQSYNTAX[c] == CCTL)
+ USTPUTC(CTLESC, out);
+ else if (eofmark == NULL)
+ USTPUTC(CTLQUOTEMARK, out);
+ USTPUTC(c, out);
+ quotef++;
+ }
+ break;
+ case CSQUOTE:
+ if (eofmark == NULL)
+ USTPUTC(CTLQUOTEMARK, out);
+ syntax = SQSYNTAX;
+ break;
+ case CDQUOTE:
+ if (eofmark == NULL)
+ USTPUTC(CTLQUOTEMARK, out);
+ syntax = DQSYNTAX;
+ dblquote = 1;
+ break;
+ case CENDQUOTE:
+ if (eofmark != NULL && arinest == 0 &&
+ varnest == 0) {
+ USTPUTC(c, out);
+ } else {
+ if (arinest) {
+ syntax = ARISYNTAX;
+ dblquote = 0;
+ } else if (eofmark == NULL &&
+ dqvarnest == 0) {
+ syntax = BASESYNTAX;
+ dblquote = 0;
+ }
+ quotef++;
+ }
+ break;
+ case CVAR: /* '$' */
+ PARSESUB(); /* parse substitution */
+ break;
+ case CENDVAR: /* '}' */
+ if (varnest > 0) {
+ varnest--;
+ if (dqvarnest > 0) {
+ dqvarnest--;
+ }
+ USTPUTC(CTLENDVAR, out);
+ } else {
+ USTPUTC(c, out);
+ }
+ break;
+#ifdef ASH_MATH_SUPPORT
+ case CLP: /* '(' in arithmetic */
+ parenlevel++;
+ USTPUTC(c, out);
+ break;
+ case CRP: /* ')' in arithmetic */
+ if (parenlevel > 0) {
+ USTPUTC(c, out);
+ --parenlevel;
+ } else {
+ if (pgetc() == ')') {
+ if (--arinest == 0) {
+ USTPUTC(CTLENDARI, out);
+ syntax = prevsyntax;
+ if (syntax == DQSYNTAX)
+ dblquote = 1;
+ else
+ dblquote = 0;
+ } else
+ USTPUTC(')', out);
+ } else {
+ /*
+ * unbalanced parens
+ * (don't 2nd guess - no error)
+ */
+ pungetc();
+ USTPUTC(')', out);
+ }
+ }
+ break;
+#endif
+ case CBQUOTE: /* '`' */
+ PARSEBACKQOLD();
+ break;
+ case CEOF:
+ goto endword; /* exit outer loop */
+ case CIGN:
+ break;
+ default:
+ if (varnest == 0)
+ goto endword; /* exit outer loop */
+ if (c != PEOA) {
+ USTPUTC(c, out);
+ }
+ }
+ c = pgetc_macro();
+ }
+ }
+endword:
+ if (syntax == ARISYNTAX)
+ synerror("Missing '))'");
+ if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
+ synerror("Unterminated quoted string");
+ if (varnest != 0) {
+ startlinno = plinno;
+ synerror("Missing '}'");
+ }
+ USTPUTC('\0', out);
+ len = out - stackblock();
+ out = stackblock();
+ if (eofmark == NULL) {
+ if ((c == '>' || c == '<')
+ && quotef == 0
+ && len <= 2
+ && (*out == '\0' || is_digit(*out))) {
+ PARSEREDIR();
+ return lasttoken = TREDIR;
+ } else {
+ pungetc();
+ }
+ }
+ quoteflag = quotef;
+ backquotelist = bqlist;
+ grabstackblock(len);
+ wordtext = out;
+ return lasttoken = TWORD;
+/* end of readtoken routine */
+
+
+
+/*
+ * Check to see whether we are at the end of the here document. When this
+ * is called, c is set to the first character of the next input line. If
+ * we are at the end of the here document, this routine sets the c to PEOF.
+ */
+
+checkend: {
+ if (eofmark) {
+ if (c == PEOA) {
+ c = pgetc2();
+ }
+ if (striptabs) {
+ while (c == '\t') {
+ c = pgetc2();
+ }
+ }
+ if (c == *eofmark) {
+ if (pfgets(line, sizeof line) != NULL) {
+ char *p, *q;
+
+ p = line;
+ for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
+ if (*p == '\n' && *q == '\0') {
+ c = PEOF;
+ plinno++;
+ needprompt = doprompt;
+ } else {
+ pushstring(line, strlen(line), NULL);
+ }
+ }
+ }
+ }
+ goto checkend_return;
+}
+
+
+/*
+ * Parse a redirection operator. The variable "out" points to a string
+ * specifying the fd to be redirected. The variable "c" contains the
+ * first character of the redirection operator.
+ */
+
+parseredir: {
+ char fd = *out;
+ union node *np;
+
+ np = (union node *)stalloc(sizeof (struct nfile));
+ if (c == '>') {
+ np->nfile.fd = 1;
+ c = pgetc();
+ if (c == '>')
+ np->type = NAPPEND;
+ else if (c == '&')
+ np->type = NTOFD;
+ else if (c == '|')
+ np->type = NTOOV;
+ else {
+ np->type = NTO;
+ pungetc();
+ }
+ } else { /* c == '<' */
+ np->nfile.fd = 0;
+ switch (c = pgetc()) {
+ case '<':
+ if (sizeof (struct nfile) != sizeof (struct nhere)) {
+ np = (union node *)stalloc(sizeof (struct nhere));
+ np->nfile.fd = 0;
+ }
+ np->type = NHERE;
+ heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
+ heredoc->here = np;
+ if ((c = pgetc()) == '-') {
+ heredoc->striptabs = 1;
+ } else {
+ heredoc->striptabs = 0;
+ pungetc();
+ }
+ break;
+
+ case '&':
+ np->type = NFROMFD;
+ break;
+
+ case '>':
+ np->type = NFROMTO;
+ break;
+
+ default:
+ np->type = NFROM;
+ pungetc();
+ break;
+ }
+ }
+ if (fd != '\0')
+ np->nfile.fd = digit_val(fd);
+ redirnode = np;
+ goto parseredir_return;
+}
+
+
+/*
+ * Parse a substitution. At this point, we have read the dollar sign
+ * and nothing else.
+ */
+
+parsesub: {
+ int subtype;
+ int typeloc;
+ int flags;
+ char *p;
+ static const char types[] = "}-+?=";
+
+ c = pgetc();
+ if (
+ c <= PEOA ||
+ (c != '(' && c != '{' && !is_name(c) && !is_special(c))
+ ) {
+ USTPUTC('$', out);
+ pungetc();
+ } else if (c == '(') { /* $(command) or $((arith)) */
+ if (pgetc() == '(') {
+ PARSEARITH();
+ } else {
+ pungetc();
+ PARSEBACKQNEW();
+ }
+ } else {
+ USTPUTC(CTLVAR, out);
+ typeloc = out - stackblock();
+ USTPUTC(VSNORMAL, out);
+ subtype = VSNORMAL;
+ if (c == '{') {
+ c = pgetc();
+ if (c == '#') {
+ if ((c = pgetc()) == '}')
+ c = '#';
+ else
+ subtype = VSLENGTH;
+ }
+ else
+ subtype = 0;
+ }
+ if (c > PEOA && is_name(c)) {
+ do {
+ STPUTC(c, out);
+ c = pgetc();
+ } while (c > PEOA && is_in_name(c));
+ } else if (is_digit(c)) {
+ do {
+ USTPUTC(c, out);
+ c = pgetc();
+ } while (is_digit(c));
+ }
+ else if (is_special(c)) {
+ USTPUTC(c, out);
+ c = pgetc();
+ }
+ else
+badsub: synerror("Bad substitution");
+
+ STPUTC('=', out);
+ flags = 0;
+ if (subtype == 0) {
+ switch (c) {
+ case ':':
+ flags = VSNUL;
+ c = pgetc();
+ /*FALLTHROUGH*/
+ default:
+ p = strchr(types, c);
+ if (p == NULL)
+ goto badsub;
+ subtype = p - types + VSNORMAL;
+ break;
+ case '%':
+ case '#':
+ {
+ int cc = c;
+ subtype = c == '#' ? VSTRIMLEFT :
+ VSTRIMRIGHT;
+ c = pgetc();
+ if (c == cc)
+ subtype++;
+ else
+ pungetc();
+ break;
+ }
+ }
+ } else {
+ pungetc();
+ }
+ if (dblquote || arinest)
+ flags |= VSQUOTE;
+ *(stackblock() + typeloc) = subtype | flags;
+ if (subtype != VSNORMAL) {
+ varnest++;
+ if (dblquote) {
+ dqvarnest++;
+ }
+ }
+ }
+ goto parsesub_return;
+}
+
+
+/*
+ * Called to parse command substitutions. Newstyle is set if the command
+ * is enclosed inside $(...); nlpp is a pointer to the head of the linked
+ * list of commands (passed by reference), and savelen is the number of
+ * characters on the top of the stack which must be preserved.
+ */
+
+parsebackq: {
+ struct nodelist **nlpp;
+ int savepbq;
+ union node *n;
+ char *volatile str;
+ struct jmploc jmploc;
+ struct jmploc *volatile savehandler;
+ int savelen;
+ int saveprompt;
+#ifdef __GNUC__
+ (void) &saveprompt;
+#endif
+
+ savepbq = parsebackquote;
+ if (setjmp(jmploc.loc)) {
+ if (str)
+ ckfree(str);
+ parsebackquote = 0;
+ handler = savehandler;
+ longjmp(handler->loc, 1);
+ }
+ INTOFF;
+ str = NULL;
+ savelen = out - stackblock();
+ if (savelen > 0) {
+ str = ckmalloc(savelen);
+ memcpy(str, stackblock(), savelen);
+ }
+ savehandler = handler;
+ handler = &jmploc;
+ INTON;
+ if (oldstyle) {
+ /* We must read until the closing backquote, giving special
+ treatment to some slashes, and then push the string and
+ reread it as input, interpreting it normally. */
+ char *pout;
+ int pc;
+ int psavelen;
+ char *pstr;
+
+
+ STARTSTACKSTR(pout);
+ for (;;) {
+ if (needprompt) {
+ setprompt(2);
+ needprompt = 0;
+ }
+ switch (pc = pgetc()) {
+ case '`':
+ goto done;
+
+ case '\\':
+ if ((pc = pgetc()) == '\n') {
+ plinno++;
+ if (doprompt)
+ setprompt(2);
+ else
+ setprompt(0);
+ /*
+ * If eating a newline, avoid putting
+ * the newline into the new character
+ * stream (via the STPUTC after the
+ * switch).
+ */
+ continue;
+ }
+ if (pc != '\\' && pc != '`' && pc != '$'
+ && (!dblquote || pc != '"'))
+ STPUTC('\\', pout);
+ if (pc > PEOA) {
+ break;
+ }
+ /* fall through */
+
+ case PEOF:
+ case PEOA:
+ startlinno = plinno;
+ synerror("EOF in backquote substitution");
+
+ case '\n':
+ plinno++;
+ needprompt = doprompt;
+ break;
+
+ default:
+ break;
+ }
+ STPUTC(pc, pout);
+ }
+done:
+ STPUTC('\0', pout);
+ psavelen = pout - stackblock();
+ if (psavelen > 0) {
+ pstr = grabstackstr(pout);
+ setinputstring(pstr);
+ }
+ }
+ nlpp = &bqlist;
+ while (*nlpp)
+ nlpp = &(*nlpp)->next;
+ *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
+ (*nlpp)->next = NULL;
+ parsebackquote = oldstyle;
+
+ if (oldstyle) {
+ saveprompt = doprompt;
+ doprompt = 0;
+ }
+
+ n = list(0);
+
+ if (oldstyle)
+ doprompt = saveprompt;
+ else {
+ if (readtoken() != TRP)
+ synexpect(TRP);
+ }
+
+ (*nlpp)->n = n;
+ if (oldstyle) {
+ /*
+ * Start reading from old file again, ignoring any pushed back
+ * tokens left from the backquote parsing
+ */
+ popfile();
+ tokpushback = 0;
+ }
+ while (stackblocksize() <= savelen)
+ growstackblock();
+ STARTSTACKSTR(out);
+ if (str) {
+ memcpy(out, str, savelen);
+ STADJUST(savelen, out);
+ INTOFF;
+ ckfree(str);
+ str = NULL;
+ INTON;
+ }
+ parsebackquote = savepbq;
+ handler = savehandler;
+ if (arinest || dblquote)
+ USTPUTC(CTLBACKQ | CTLQUOTE, out);
+ else
+ USTPUTC(CTLBACKQ, out);
+ if (oldstyle)
+ goto parsebackq_oldreturn;
+ else
+ goto parsebackq_newreturn;
+}
+
+/*
+ * Parse an arithmetic expansion (indicate start of one and set state)
+ */
+parsearith: {
+
+ if (++arinest == 1) {
+ prevsyntax = syntax;
+ syntax = ARISYNTAX;
+ USTPUTC(CTLARI, out);
+ if (dblquote)
+ USTPUTC('"',out);
+ else
+ USTPUTC(' ',out);
+ } else {
+ /*
+ * we collapse embedded arithmetic expansion to
+ * parenthesis, which should be equivalent
+ */
+ USTPUTC('(', out);
+ }
+ goto parsearith_return;
+}
+
+} /* end of readtoken */
+
+
+
+#ifdef mkinit
+INCLUDE "parser.h"
+RESET {
+ tokpushback = 0;
+ checkkwd = 0;
+ checkalias = 0;
+}
+#endif
+
+/*
+ * Returns true if the text contains nothing to expand (no dollar signs
+ * or backquotes).
+ */
+
+static int
+noexpand(text)
+ char *text;
+ {
+ char *p;
+ char c;
+
+ p = text;
+ while ((c = *p++) != '\0') {
+ if (c == CTLQUOTEMARK)
+ continue;
+ if (c == CTLESC)
+ p++;
+ else if (BASESYNTAX[(int)c] == CCTL)
+ return 0;
+ }
+ return 1;
+}
+
+
+/*
+ * Return true if the argument is a legal variable name (a letter or
+ * underscore followed by zero or more letters, underscores, and digits).
+ */
+
+static int
+goodname(char *name)
+ {
+ char *p;
+
+ p = name;
+ if (! is_name(*p))
+ return 0;
+ while (*++p) {
+ if (! is_in_name(*p))
+ return 0;
+ }
+ return 1;
+}
+
+
+/*
+ * Called when an unexpected token is read during the parse. The argument
+ * is the token that is expected, or -1 if more than one type of token can
+ * occur at this point.
+ */
+
+static void
+synexpect(token)
+ int token;
+{
+ char msg[64];
+
+ if (token >= 0) {
+ fmtstr(msg, 64, "%s unexpected (expecting %s)",
+ tokname[lasttoken], tokname[token]);
+ } else {
+ fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]);
+ }
+ synerror(msg);
+ /* NOTREACHED */
+}
+
+
+static void
+synerror(msg)
+ const char *msg;
+ {
+ if (commandname)
+ outfmt(&errout, "%s: %d: ", commandname, startlinno);
+ outfmt(&errout, "Syntax error: %s\n", msg);
+ error((char *)NULL);
+ /* NOTREACHED */
+}
+
+static void
+setprompt(int which)
+{
+ whichprompt = which;
+ putprompt(getprompt(NULL));
+}
+
+/*
+ * called by editline -- any expansions to the prompt
+ * should be added here.
+ */
+static const char *
+getprompt(void *unused)
+ {
+ switch (whichprompt) {
+ case 0:
+ return "";
+ case 1:
+ return ps1val();
+ case 2:
+ return ps2val();
+ default:
+ return "<internal prompt error>";
+ }
+}
+
+static int
+isassignment(const char *word) {
+ if (!is_name(*word)) {
+ return 0;
+ }
+ do {
+ word++;
+ } while (is_in_name(*word));
+ return *word == '=';
+}
+
+static const char *const *
+findkwd(const char *s) {
+ return findstring(
+ s, parsekwd, sizeof(parsekwd) / sizeof(const char *)
+ );
+}
+/* $NetBSD: redir.c,v 1.22 2000/05/22 10:18:47 elric Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Code for dealing with input/output redirection.
+ */
+
+#define EMPTY -2 /* marks an unused slot in redirtab */
+#ifndef PIPE_BUF
+# define PIPESIZE 4096 /* amount of buffering in a pipe */
+#else
+# define PIPESIZE PIPE_BUF
+#endif
+
+
+struct redirtab *redirlist;
+
+/*
+ * We keep track of whether or not fd0 has been redirected. This is for
+ * background commands, where we want to redirect fd0 to /dev/null only
+ * if it hasn't already been redirected.
+*/
+static int fd0_redirected = 0;
+
+/*
+ * We also keep track of where fileno2 goes.
+ */
+static int fileno2 = 2;
+
+static int openredirect __P((union node *));
+static void dupredirect __P((union node *, int, char[10 ]));
+static int openhere __P((union node *));
+static int noclobberopen __P((const char *));
+
+
+/*
+ * Process a list of redirection commands. If the REDIR_PUSH flag is set,
+ * old file descriptors are stashed away so that the redirection can be
+ * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
+ * standard output, and the standard error if it becomes a duplicate of
+ * stdout, is saved in memory.
+ */
+
+static void
+redirect(redir, flags)
+ union node *redir;
+ int flags;
+ {
+ union node *n;
+ struct redirtab *sv = NULL;
+ int i;
+ int fd;
+ int newfd;
+ int try;
+ char memory[10]; /* file descriptors to write to memory */
+
+ for (i = 10 ; --i >= 0 ; )
+ memory[i] = 0;
+ memory[1] = flags & REDIR_BACKQ;
+ if (flags & REDIR_PUSH) {
+ sv = ckmalloc(sizeof (struct redirtab));
+ for (i = 0 ; i < 10 ; i++)
+ sv->renamed[i] = EMPTY;
+ sv->next = redirlist;
+ redirlist = sv;
+ }
+ for (n = redir ; n ; n = n->nfile.next) {
+ fd = n->nfile.fd;
+ try = 0;
+ if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) &&
+ n->ndup.dupfd == fd)
+ continue; /* redirect from/to same file descriptor */
+
+ INTOFF;
+ newfd = openredirect(n);
+ if (((flags & REDIR_PUSH) && sv->renamed[fd] == EMPTY) ||
+ (fd == fileno2)) {
+ if (newfd == fd) {
+ try++;
+ } else if ((i = fcntl(fd, F_DUPFD, 10)) == -1) {
+ switch (errno) {
+ case EBADF:
+ if (!try) {
+ dupredirect(n, newfd, memory);
+ try++;
+ break;
+ }
+ /* FALLTHROUGH*/
+ default:
+ if (newfd >= 0) {
+ close(newfd);
+ }
+ INTON;
+ error("%d: %s", fd, strerror(errno));
+ /* NOTREACHED */
+ }
+ }
+ if (!try) {
+ close(fd);
+ if (flags & REDIR_PUSH) {
+ sv->renamed[fd] = i;
+ }
+ if (fd == fileno2) {
+ fileno2 = i;
+ }
+ }
+ } else if (fd != newfd) {
+ close(fd);
+ }
+ if (fd == 0)
+ fd0_redirected++;
+ if (!try)
+ dupredirect(n, newfd, memory);
+ INTON;
+ }
+ if (memory[1])
+ out1 = &memout;
+ if (memory[2])
+ out2 = &memout;
+}
+
+
+static int
+openredirect(redir)
+ union node *redir;
+ {
+ char *fname;
+ int f;
+
+ switch (redir->nfile.type) {
+ case NFROM:
+ fname = redir->nfile.expfname;
+ if ((f = open(fname, O_RDONLY)) < 0)
+ goto eopen;
+ break;
+ case NFROMTO:
+ fname = redir->nfile.expfname;
+ if ((f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
+ goto ecreate;
+ break;
+ case NTO:
+ /* Take care of noclobber mode. */
+ if (Cflag) {
+ fname = redir->nfile.expfname;
+ if ((f = noclobberopen(fname)) < 0)
+ goto ecreate;
+ break;
+ }
+ case NTOOV:
+ fname = redir->nfile.expfname;
+#ifdef O_CREAT
+ if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
+ goto ecreate;
+#else
+ if ((f = creat(fname, 0666)) < 0)
+ goto ecreate;
+#endif
+ break;
+ case NAPPEND:
+ fname = redir->nfile.expfname;
+#ifdef O_APPEND
+ if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
+ goto ecreate;
+#else
+ if ((f = open(fname, O_WRONLY)) < 0
+ && (f = creat(fname, 0666)) < 0)
+ goto ecreate;
+ lseek(f, (off_t)0, 2);
+#endif
+ break;
+ default:
+#ifdef DEBUG
+ abort();
+#endif
+ /* Fall through to eliminate warning. */
+ case NTOFD:
+ case NFROMFD:
+ f = -1;
+ break;
+ case NHERE:
+ case NXHERE:
+ f = openhere(redir);
+ break;
+ }
+
+ return f;
+ecreate:
+ error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
+eopen:
+ error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
+}
+
+
+static void
+dupredirect(redir, f, memory)
+ union node *redir;
+ int f;
+ char memory[10];
+ {
+ int fd = redir->nfile.fd;
+
+ memory[fd] = 0;
+ if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
+ if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
+ if (memory[redir->ndup.dupfd])
+ memory[fd] = 1;
+ else
+ dup_as_newfd(redir->ndup.dupfd, fd);
+ }
+ return;
+ }
+
+ if (f != fd) {
+ dup_as_newfd(f, fd);
+ close(f);
+ }
+ return;
+}
+
+
+/*
+ * Handle here documents. Normally we fork off a process to write the
+ * data to a pipe. If the document is short, we can stuff the data in
+ * the pipe without forking.
+ */
+
+static int
+openhere(redir)
+ union node *redir;
+ {
+ int pip[2];
+ int len = 0;
+
+ if (pipe(pip) < 0)
+ error("Pipe call failed");
+ if (redir->type == NHERE) {
+ len = strlen(redir->nhere.doc->narg.text);
+ if (len <= PIPESIZE) {
+ xwrite(pip[1], redir->nhere.doc->narg.text, len);
+ goto out;
+ }
+ }
+ if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
+ close(pip[0]);
+ signal(SIGINT, SIG_IGN);
+ signal(SIGQUIT, SIG_IGN);
+ signal(SIGHUP, SIG_IGN);
+#ifdef SIGTSTP
+ signal(SIGTSTP, SIG_IGN);
+#endif
+ signal(SIGPIPE, SIG_DFL);
+ if (redir->type == NHERE)
+ xwrite(pip[1], redir->nhere.doc->narg.text, len);
+ else
+ expandhere(redir->nhere.doc, pip[1]);
+ _exit(0);
+ }
+out:
+ close(pip[1]);
+ return pip[0];
+}
+
+
+
+/*
+ * Undo the effects of the last redirection.
+ */
+
+static void
+popredir() {
+ struct redirtab *rp = redirlist;
+ int i;
+
+ INTOFF;
+ for (i = 0 ; i < 10 ; i++) {
+ if (rp->renamed[i] != EMPTY) {
+ if (i == 0)
+ fd0_redirected--;
+ close(i);
+ if (rp->renamed[i] >= 0) {
+ dup_as_newfd(rp->renamed[i], i);
+ close(rp->renamed[i]);
+ }
+ if (rp->renamed[i] == fileno2) {
+ fileno2 = i;
+ }
+ }
+ }
+ redirlist = rp->next;
+ ckfree(rp);
+ INTON;
+}
+
+/*
+ * Undo all redirections. Called on error or interrupt.
+ */
+
+#ifdef mkinit
+
+INCLUDE "redir.h"
+
+RESET {
+ while (redirlist)
+ popredir();
+}
+
+SHELLPROC {
+ clearredir();
+}
+
+#endif
+
+/* Return true if fd 0 has already been redirected at least once. */
+static int
+fd0_redirected_p () {
+ return fd0_redirected != 0;
+}
+
+/*
+ * Discard all saved file descriptors.
+ */
+
+static void
+clearredir() {
+ struct redirtab *rp;
+ int i;
+
+ for (rp = redirlist ; rp ; rp = rp->next) {
+ for (i = 0 ; i < 10 ; i++) {
+ if (rp->renamed[i] >= 0) {
+ close(rp->renamed[i]);
+ if (rp->renamed[i] == fileno2) {
+ fileno2 = -1;
+ }
+ }
+ rp->renamed[i] = EMPTY;
+ }
+ }
+ if (fileno2 != 2 && fileno2 >= 0) {
+ close(fileno2);
+ fileno2 = -1;
+ }
+}
+
+
+
+/*
+ * Copy a file descriptor to be >= to. Returns -1
+ * if the source file descriptor is closed, EMPTY if there are no unused
+ * file descriptors left.
+ */
+
+static int
+dup_as_newfd(from, to)
+ int from;
+ int to;
+{
+ int newfd;
+
+ newfd = fcntl(from, F_DUPFD, to);
+ if (newfd < 0) {
+ if (errno == EMFILE)
+ return EMPTY;
+ else
+ error("%d: %s", from, strerror(errno));
+ }
+ return newfd;
+}
+
+/*
+ * Open a file in noclobber mode.
+ * The code was copied from bash.
+ */
+static int
+noclobberopen(fname)
+ const char *fname;
+{
+ int r, fd;
+ struct stat finfo, finfo2;
+
+ /*
+ * If the file exists and is a regular file, return an error
+ * immediately.
+ */
+ r = stat(fname, &finfo);
+ if (r == 0 && S_ISREG(finfo.st_mode)) {
+ errno = EEXIST;
+ return -1;
+ }
+
+ /*
+ * If the file was not present (r != 0), make sure we open it
+ * exclusively so that if it is created before we open it, our open
+ * will fail. Make sure that we do not truncate an existing file.
+ * Note that we don't turn on O_EXCL unless the stat failed -- if the
+ * file was not a regular file, we leave O_EXCL off.
+ */
+ if (r != 0)
+ return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
+ fd = open(fname, O_WRONLY|O_CREAT, 0666);
+
+ /* If the open failed, return the file descriptor right away. */
+ if (fd < 0)
+ return fd;
+
+ /*
+ * OK, the open succeeded, but the file may have been changed from a
+ * non-regular file to a regular file between the stat and the open.
+ * We are assuming that the O_EXCL open handles the case where FILENAME
+ * did not exist and is symlinked to an existing file between the stat
+ * and open.
+ */
+
+ /*
+ * If we can open it and fstat the file descriptor, and neither check
+ * revealed that it was a regular file, and the file has not been
+ * replaced, return the file descriptor.
+ */
+ if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) &&
+ finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
+ return fd;
+
+ /* The file has been replaced. badness. */
+ close(fd);
+ errno = EEXIST;
+ return -1;
+}
+/* $NetBSD: setmode.c,v 1.28 2000/01/25 15:43:43 enami Exp $ */
+
+/*
+ * Copyright (c) 1989, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Dave Borman at Cray Research, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifdef __weak_alias
+__weak_alias(getmode,_getmode)
+__weak_alias(setmode,_setmode)
+#endif
+
+#ifdef __GLIBC__
+#define S_ISTXT __S_ISVTX
+#endif
+
+#define SET_LEN 6 /* initial # of bitcmd struct to malloc */
+#define SET_LEN_INCR 4 /* # of bitcmd structs to add as needed */
+
+typedef struct bitcmd {
+ char cmd;
+ char cmd2;
+ mode_t bits;
+} BITCMD;
+
+#define CMD2_CLR 0x01
+#define CMD2_SET 0x02
+#define CMD2_GBITS 0x04
+#define CMD2_OBITS 0x08
+#define CMD2_UBITS 0x10
+
+static BITCMD *addcmd __P((BITCMD *, int, int, int, u_int));
+static void compress_mode __P((BITCMD *));
+#ifdef SETMODE_DEBUG
+static void dumpmode __P((BITCMD *));
+#endif
+
+/*
+ * Given the old mode and an array of bitcmd structures, apply the operations
+ * described in the bitcmd structures to the old mode, and return the new mode.
+ * Note that there is no '=' command; a strict assignment is just a '-' (clear
+ * bits) followed by a '+' (set bits).
+ */
+mode_t
+getmode(bbox, omode)
+ const void *bbox;
+ mode_t omode;
+{
+ const BITCMD *set;
+ mode_t clrval, newmode, value;
+
+ _DIAGASSERT(bbox != NULL);
+
+ set = (const BITCMD *)bbox;
+ newmode = omode;
+ for (value = 0;; set++)
+ switch(set->cmd) {
+ /*
+ * When copying the user, group or other bits around, we "know"
+ * where the bits are in the mode so that we can do shifts to
+ * copy them around. If we don't use shifts, it gets real
+ * grundgy with lots of single bit checks and bit sets.
+ */
+ case 'u':
+ value = (newmode & S_IRWXU) >> 6;
+ goto common;
+
+ case 'g':
+ value = (newmode & S_IRWXG) >> 3;
+ goto common;
+
+ case 'o':
+ value = newmode & S_IRWXO;
+common: if (set->cmd2 & CMD2_CLR) {
+ clrval =
+ (set->cmd2 & CMD2_SET) ? S_IRWXO : value;
+ if (set->cmd2 & CMD2_UBITS)
+ newmode &= ~((clrval<<6) & set->bits);
+ if (set->cmd2 & CMD2_GBITS)
+ newmode &= ~((clrval<<3) & set->bits);
+ if (set->cmd2 & CMD2_OBITS)
+ newmode &= ~(clrval & set->bits);
+ }
+ if (set->cmd2 & CMD2_SET) {
+ if (set->cmd2 & CMD2_UBITS)
+ newmode |= (value<<6) & set->bits;
+ if (set->cmd2 & CMD2_GBITS)
+ newmode |= (value<<3) & set->bits;
+ if (set->cmd2 & CMD2_OBITS)
+ newmode |= value & set->bits;
+ }
+ break;
+
+ case '+':
+ newmode |= set->bits;
+ break;
+
+ case '-':
+ newmode &= ~set->bits;
+ break;
+
+ case 'X':
+ if (omode & (S_IFDIR|S_IXUSR|S_IXGRP|S_IXOTH))
+ newmode |= set->bits;
+ break;
+
+ case '\0':
+ default:
+#ifdef SETMODE_DEBUG
+ (void)printf("getmode:%04o -> %04o\n", omode, newmode);
+#endif
+ return (newmode);
+ }
+}
+
+#define ADDCMD(a, b, c, d) do { \
+ if (set >= endset) { \
+ BITCMD *newset; \
+ setlen += SET_LEN_INCR; \
+ newset = realloc(saveset, sizeof(BITCMD) * setlen); \
+ if (newset == NULL) { \
+ free(saveset); \
+ return (NULL); \
+ } \
+ set = newset + (set - saveset); \
+ saveset = newset; \
+ endset = newset + (setlen - 2); \
+ } \
+ set = addcmd(set, (a), (b), (c), (d)); \
+} while (/*CONSTCOND*/0)
+
+#define STANDARD_BITS (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
+
+static void *
+setmode(p)
+ const char *p;
+{
+ int perm, who;
+ char op, *ep;
+ BITCMD *set, *saveset, *endset;
+ sigset_t mysigset, sigoset;
+ mode_t mask;
+ int equalopdone = 0; /* pacify gcc */
+ int permXbits, setlen;
+
+ if (!*p)
+ return (NULL);
+
+ /*
+ * Get a copy of the mask for the permissions that are mask relative.
+ * Flip the bits, we want what's not set. Since it's possible that
+ * the caller is opening files inside a signal handler, protect them
+ * as best we can.
+ */
+ sigfillset(&mysigset);
+ (void)sigprocmask(SIG_BLOCK, &mysigset, &sigoset);
+ (void)umask(mask = umask(0));
+ mask = ~mask;
+ (void)sigprocmask(SIG_SETMASK, &sigoset, NULL);
+
+ setlen = SET_LEN + 2;
+
+ if ((set = malloc((u_int)(sizeof(BITCMD) * setlen))) == NULL)
+ return (NULL);
+ saveset = set;
+ endset = set + (setlen - 2);
+
+ /*
+ * If an absolute number, get it and return; disallow non-octal digits
+ * or illegal bits.
+ */
+ if (isdigit((unsigned char)*p)) {
+ perm = (mode_t)strtol(p, &ep, 8);
+ if (*ep || perm & ~(STANDARD_BITS|S_ISTXT)) {
+ free(saveset);
+ return (NULL);
+ }
+ ADDCMD('=', (STANDARD_BITS|S_ISTXT), perm, mask);
+ set->cmd = 0;
+ return (saveset);
+ }
+
+ /*
+ * Build list of structures to set/clear/copy bits as described by
+ * each clause of the symbolic mode.
+ */
+ for (;;) {
+ /* First, find out which bits might be modified. */
+ for (who = 0;; ++p) {
+ switch (*p) {
+ case 'a':
+ who |= STANDARD_BITS;
+ break;
+ case 'u':
+ who |= S_ISUID|S_IRWXU;
+ break;
+ case 'g':
+ who |= S_ISGID|S_IRWXG;
+ break;
+ case 'o':
+ who |= S_IRWXO;
+ break;
+ default:
+ goto getop;
+ }
+ }
+
+getop: if ((op = *p++) != '+' && op != '-' && op != '=') {
+ free(saveset);
+ return (NULL);
+ }
+ if (op == '=')
+ equalopdone = 0;
+
+ who &= ~S_ISTXT;
+ for (perm = 0, permXbits = 0;; ++p) {
+ switch (*p) {
+ case 'r':
+ perm |= S_IRUSR|S_IRGRP|S_IROTH;
+ break;
+ case 's':
+ /*
+ * If specific bits where requested and
+ * only "other" bits ignore set-id.
+ */
+ if (who == 0 || (who & ~S_IRWXO))
+ perm |= S_ISUID|S_ISGID;
+ break;
+ case 't':
+ /*
+ * If specific bits where requested and
+ * only "other" bits ignore set-id.
+ */
+ if (who == 0 || (who & ~S_IRWXO)) {
+ who |= S_ISTXT;
+ perm |= S_ISTXT;
+ }
+ break;
+ case 'w':
+ perm |= S_IWUSR|S_IWGRP|S_IWOTH;
+ break;
+ case 'X':
+ permXbits = S_IXUSR|S_IXGRP|S_IXOTH;
+ break;
+ case 'x':
+ perm |= S_IXUSR|S_IXGRP|S_IXOTH;
+ break;
+ case 'u':
+ case 'g':
+ case 'o':
+ /*
+ * When ever we hit 'u', 'g', or 'o', we have
+ * to flush out any partial mode that we have,
+ * and then do the copying of the mode bits.
+ */
+ if (perm) {
+ ADDCMD(op, who, perm, mask);
+ perm = 0;
+ }
+ if (op == '=')
+ equalopdone = 1;
+ if (op == '+' && permXbits) {
+ ADDCMD('X', who, permXbits, mask);
+ permXbits = 0;
+ }
+ ADDCMD(*p, who, op, mask);
+ break;
+
+ default:
+ /*
+ * Add any permissions that we haven't already
+ * done.
+ */
+ if (perm || (op == '=' && !equalopdone)) {
+ if (op == '=')
+ equalopdone = 1;
+ ADDCMD(op, who, perm, mask);
+ perm = 0;
+ }
+ if (permXbits) {
+ ADDCMD('X', who, permXbits, mask);
+ permXbits = 0;
+ }
+ goto apply;
+ }
+ }
+
+apply: if (!*p)
+ break;
+ if (*p != ',')
+ goto getop;
+ ++p;
+ }
+ set->cmd = 0;
+#ifdef SETMODE_DEBUG
+ (void)printf("Before compress_mode()\n");
+ dumpmode(saveset);
+#endif
+ compress_mode(saveset);
+#ifdef SETMODE_DEBUG
+ (void)printf("After compress_mode()\n");
+ dumpmode(saveset);
+#endif
+ return (saveset);
+}
+
+static BITCMD *
+addcmd(set, op, who, oparg, mask)
+ BITCMD *set;
+ int oparg, who;
+ int op;
+ u_int mask;
+{
+
+ _DIAGASSERT(set != NULL);
+
+ switch (op) {
+ case '=':
+ set->cmd = '-';
+ set->bits = who ? who : STANDARD_BITS;
+ set++;
+
+ op = '+';
+ /* FALLTHROUGH */
+ case '+':
+ case '-':
+ case 'X':
+ set->cmd = op;
+ set->bits = (who ? who : mask) & oparg;
+ break;
+
+ case 'u':
+ case 'g':
+ case 'o':
+ set->cmd = op;
+ if (who) {
+ set->cmd2 = ((who & S_IRUSR) ? CMD2_UBITS : 0) |
+ ((who & S_IRGRP) ? CMD2_GBITS : 0) |
+ ((who & S_IROTH) ? CMD2_OBITS : 0);
+ set->bits = (mode_t)~0;
+ } else {
+ set->cmd2 = CMD2_UBITS | CMD2_GBITS | CMD2_OBITS;
+ set->bits = mask;
+ }
+
+ if (oparg == '+')
+ set->cmd2 |= CMD2_SET;
+ else if (oparg == '-')
+ set->cmd2 |= CMD2_CLR;
+ else if (oparg == '=')
+ set->cmd2 |= CMD2_SET|CMD2_CLR;
+ break;
+ }
+ return (set + 1);
+}
+
+#ifdef SETMODE_DEBUG
+static void
+dumpmode(set)
+ BITCMD *set;
+{
+
+ _DIAGASSERT(set != NULL);
+
+ for (; set->cmd; ++set)
+ (void)printf("cmd: '%c' bits %04o%s%s%s%s%s%s\n",
+ set->cmd, set->bits, set->cmd2 ? " cmd2:" : "",
+ set->cmd2 & CMD2_CLR ? " CLR" : "",
+ set->cmd2 & CMD2_SET ? " SET" : "",
+ set->cmd2 & CMD2_UBITS ? " UBITS" : "",
+ set->cmd2 & CMD2_GBITS ? " GBITS" : "",
+ set->cmd2 & CMD2_OBITS ? " OBITS" : "");
+}
+#endif
+
+/*
+ * Given an array of bitcmd structures, compress by compacting consecutive
+ * '+', '-' and 'X' commands into at most 3 commands, one of each. The 'u',
+ * 'g' and 'o' commands continue to be separate. They could probably be
+ * compacted, but it's not worth the effort.
+ */
+static void
+compress_mode(set)
+ BITCMD *set;
+{
+ BITCMD *nset;
+ int setbits, clrbits, Xbits, op;
+
+ _DIAGASSERT(set != NULL);
+
+ for (nset = set;;) {
+ /* Copy over any 'u', 'g' and 'o' commands. */
+ while ((op = nset->cmd) != '+' && op != '-' && op != 'X') {
+ *set++ = *nset++;
+ if (!op)
+ return;
+ }
+
+ for (setbits = clrbits = Xbits = 0;; nset++) {
+ if ((op = nset->cmd) == '-') {
+ clrbits |= nset->bits;
+ setbits &= ~nset->bits;
+ Xbits &= ~nset->bits;
+ } else if (op == '+') {
+ setbits |= nset->bits;
+ clrbits &= ~nset->bits;
+ Xbits &= ~nset->bits;
+ } else if (op == 'X')
+ Xbits |= nset->bits & ~setbits;
+ else
+ break;
+ }
+ if (clrbits) {
+ set->cmd = '-';
+ set->cmd2 = 0;
+ set->bits = clrbits;
+ set++;
+ }
+ if (setbits) {
+ set->cmd = '+';
+ set->cmd2 = 0;
+ set->bits = setbits;
+ set++;
+ }
+ if (Xbits) {
+ set->cmd = 'X';
+ set->cmd2 = 0;
+ set->bits = Xbits;
+ set++;
+ }
+ }
+}
+/* $NetBSD: show.c,v 1.18 1999/10/08 21:10:44 pk Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#ifdef DEBUG
+static void shtree __P((union node *, int, char *, FILE*));
+static void shcmd __P((union node *, FILE *));
+static void sharg __P((union node *, FILE *));
+static void indent __P((int, char *, FILE *));
+static void trstring __P((char *));
+
+
+static void
+showtree(n)
+ union node *n;
+{
+ trputs("showtree called\n");
+ shtree(n, 1, NULL, stdout);
+}
+
+
+static void
+shtree(n, ind, pfx, fp)
+ union node *n;
+ int ind;
+ char *pfx;
+ FILE *fp;
+{
+ struct nodelist *lp;
+ const char *s;
+
+ if (n == NULL)
+ return;
+
+ indent(ind, pfx, fp);
+ switch(n->type) {
+ case NSEMI:
+ s = "; ";
+ goto binop;
+ case NAND:
+ s = " && ";
+ goto binop;
+ case NOR:
+ s = " || ";
+binop:
+ shtree(n->nbinary.ch1, ind, NULL, fp);
+ /* if (ind < 0) */
+ fputs(s, fp);
+ shtree(n->nbinary.ch2, ind, NULL, fp);
+ break;
+ case NCMD:
+ shcmd(n, fp);
+ if (ind >= 0)
+ putc('\n', fp);
+ break;
+ case NPIPE:
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
+ shcmd(lp->n, fp);
+ if (lp->next)
+ fputs(" | ", fp);
+ }
+ if (n->npipe.backgnd)
+ fputs(" &", fp);
+ if (ind >= 0)
+ putc('\n', fp);
+ break;
+ default:
+ fprintf(fp, "<node type %d>", n->type);
+ if (ind >= 0)
+ putc('\n', fp);
+ break;
+ }
+}
+
+
+
+static void
+shcmd(cmd, fp)
+ union node *cmd;
+ FILE *fp;
+{
+ union node *np;
+ int first;
+ const char *s;
+ int dftfd;
+
+ first = 1;
+ for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
+ if (! first)
+ putchar(' ');
+ sharg(np, fp);
+ first = 0;
+ }
+ for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
+ if (! first)
+ putchar(' ');
+ switch (np->nfile.type) {
+ case NTO: s = ">"; dftfd = 1; break;
+ case NAPPEND: s = ">>"; dftfd = 1; break;
+ case NTOFD: s = ">&"; dftfd = 1; break;
+ case NTOOV: s = ">|"; dftfd = 1; break;
+ case NFROM: s = "<"; dftfd = 0; break;
+ case NFROMFD: s = "<&"; dftfd = 0; break;
+ case NFROMTO: s = "<>"; dftfd = 0; break;
+ default: s = "*error*"; dftfd = 0; break;
+ }
+ if (np->nfile.fd != dftfd)
+ fprintf(fp, "%d", np->nfile.fd);
+ fputs(s, fp);
+ if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
+ fprintf(fp, "%d", np->ndup.dupfd);
+ } else {
+ sharg(np->nfile.fname, fp);
+ }
+ first = 0;
+ }
+}
+
+
+
+static void
+sharg(arg, fp)
+ union node *arg;
+ FILE *fp;
+ {
+ char *p;
+ struct nodelist *bqlist;
+ int subtype;
+
+ if (arg->type != NARG) {
+ printf("<node type %d>\n", arg->type);
+ fflush(stdout);
+ abort();
+ }
+ bqlist = arg->narg.backquote;
+ for (p = arg->narg.text ; *p ; p++) {
+ switch (*p) {
+ case CTLESC:
+ putc(*++p, fp);
+ break;
+ case CTLVAR:
+ putc('$', fp);
+ putc('{', fp);
+ subtype = *++p;
+ if (subtype == VSLENGTH)
+ putc('#', fp);
+
+ while (*p != '=')
+ putc(*p++, fp);
+
+ if (subtype & VSNUL)
+ putc(':', fp);
+
+ switch (subtype & VSTYPE) {
+ case VSNORMAL:
+ putc('}', fp);
+ break;
+ case VSMINUS:
+ putc('-', fp);
+ break;
+ case VSPLUS:
+ putc('+', fp);
+ break;
+ case VSQUESTION:
+ putc('?', fp);
+ break;
+ case VSASSIGN:
+ putc('=', fp);
+ break;
+ case VSTRIMLEFT:
+ putc('#', fp);
+ break;
+ case VSTRIMLEFTMAX:
+ putc('#', fp);
+ putc('#', fp);
+ break;
+ case VSTRIMRIGHT:
+ putc('%', fp);
+ break;
+ case VSTRIMRIGHTMAX:
+ putc('%', fp);
+ putc('%', fp);
+ break;
+ case VSLENGTH:
+ break;
+ default:
+ printf("<subtype %d>", subtype);
+ }
+ break;
+ case CTLENDVAR:
+ putc('}', fp);
+ break;
+ case CTLBACKQ:
+ case CTLBACKQ|CTLQUOTE:
+ putc('$', fp);
+ putc('(', fp);
+ shtree(bqlist->n, -1, NULL, fp);
+ putc(')', fp);
+ break;
+ default:
+ putc(*p, fp);
+ break;
+ }
+ }
+}
+
+
+static void
+indent(amount, pfx, fp)
+ int amount;
+ char *pfx;
+ FILE *fp;
+{
+ int i;
+
+ for (i = 0 ; i < amount ; i++) {
+ if (pfx && i == amount - 1)
+ fputs(pfx, fp);
+ putc('\t', fp);
+ }
+}
+#endif
+
+
+
+/*
+ * Debugging stuff.
+ */
+
+
+#ifdef DEBUG
+FILE *tracefile;
+
+#if DEBUG == 2
+static int debug = 1;
+#else
+static int debug = 0;
+#endif
+
+
+static void
+trputc(c)
+ int c;
+{
+ if (tracefile == NULL)
+ return;
+ putc(c, tracefile);
+ if (c == '\n')
+ fflush(tracefile);
+}
+
+static void
+trace(const char *fmt, ...)
+{
+ va_list va;
+#ifdef __STDC__
+ va_start(va, fmt);
+#else
+ char *fmt;
+ va_start(va);
+ fmt = va_arg(va, char *);
+#endif
+ if (tracefile != NULL) {
+ (void) vfprintf(tracefile, fmt, va);
+ if (strchr(fmt, '\n'))
+ (void) fflush(tracefile);
+ }
+ va_end(va);
+}
+
+
+static void
+trputs(s)
+ const char *s;
+{
+ if (tracefile == NULL)
+ return;
+ fputs(s, tracefile);
+ if (strchr(s, '\n'))
+ fflush(tracefile);
+}
+
+
+static void
+trstring(s)
+ char *s;
+{
+ char *p;
+ char c;
+
+ if (tracefile == NULL)
+ return;
+ putc('"', tracefile);
+ for (p = s ; *p ; p++) {
+ switch (*p) {
+ case '\n': c = 'n'; goto backslash;
+ case '\t': c = 't'; goto backslash;
+ case '\r': c = 'r'; goto backslash;
+ case '"': c = '"'; goto backslash;
+ case '\\': c = '\\'; goto backslash;
+ case CTLESC: c = 'e'; goto backslash;
+ case CTLVAR: c = 'v'; goto backslash;
+ case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
+ case CTLBACKQ: c = 'q'; goto backslash;
+ case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
+backslash: putc('\\', tracefile);
+ putc(c, tracefile);
+ break;
+ default:
+ if (*p >= ' ' && *p <= '~')
+ putc(*p, tracefile);
+ else {
+ putc('\\', tracefile);
+ putc(*p >> 6 & 03, tracefile);
+ putc(*p >> 3 & 07, tracefile);
+ putc(*p & 07, tracefile);
+ }
+ break;
+ }
+ }
+ putc('"', tracefile);
+}
+
+
+static void
+trargs(ap)
+ char **ap;
+{
+ if (tracefile == NULL)
+ return;
+ while (*ap) {
+ trstring(*ap++);
+ if (*ap)
+ putc(' ', tracefile);
+ else
+ putc('\n', tracefile);
+ }
+ fflush(tracefile);
+}
+
+
+static void
+opentrace() {
+ char s[100];
+#ifdef O_APPEND
+ int flags;
+#endif
+
+ if (!debug)
+ return;
+#ifdef not_this_way
+ {
+ char *p;
+ if ((p = getenv("HOME")) == NULL) {
+ if (geteuid() == 0)
+ p = "/";
+ else
+ p = "/tmp";
+ }
+ scopy(p, s);
+ strcat(s, "/trace");
+ }
+#else
+ scopy("./trace", s);
+#endif /* not_this_way */
+ if ((tracefile = fopen(s, "a")) == NULL) {
+ fprintf(stderr, "Can't open %s\n", s);
+ return;
+ }
+#ifdef O_APPEND
+ if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
+ fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
+#endif
+ fputs("\nTracing started.\n", tracefile);
+ fflush(tracefile);
+}
+#endif /* DEBUG */
+
+
+/*
+ * This file was generated by the mksyntax program.
+ */
+
+/* syntax table used when not in quotes */
+static const char basesyntax[257] = {
+ CEOF, CSPCL, CWORD, CCTL,
+ CCTL, CCTL, CCTL, CCTL,
+ CCTL, CCTL, CCTL, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CSPCL,
+ CNL, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CSPCL, CWORD,
+ CDQUOTE, CWORD, CVAR, CWORD,
+ CSPCL, CSQUOTE, CSPCL, CSPCL,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CSPCL, CSPCL, CWORD,
+ CSPCL, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CBACK, CWORD,
+ CWORD, CWORD, CBQUOTE, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CSPCL, CENDVAR,
+ CWORD
+};
+
+/* syntax table used when in double quotes */
+static const char dqsyntax[257] = {
+ CEOF, CIGN, CWORD, CCTL,
+ CCTL, CCTL, CCTL, CCTL,
+ CCTL, CCTL, CCTL, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CNL, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CCTL,
+ CENDQUOTE,CWORD, CVAR, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CCTL, CWORD, CWORD, CCTL,
+ CWORD, CCTL, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CCTL, CWORD, CWORD, CCTL,
+ CWORD, CCTL, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CCTL, CBACK, CCTL,
+ CWORD, CWORD, CBQUOTE, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CENDVAR,
+ CCTL
+};
+
+/* syntax table used when in single quotes */
+static const char sqsyntax[257] = {
+ CEOF, CIGN, CWORD, CCTL,
+ CCTL, CCTL, CCTL, CCTL,
+ CCTL, CCTL, CCTL, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CNL, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CCTL,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CENDQUOTE,CWORD, CWORD,
+ CCTL, CWORD, CWORD, CCTL,
+ CWORD, CCTL, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CCTL, CWORD, CWORD, CCTL,
+ CWORD, CCTL, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CCTL, CCTL, CCTL,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CCTL
+};
+
+/* syntax table used when in arithmetic */
+static const char arisyntax[257] = {
+ CEOF, CIGN, CWORD, CCTL,
+ CCTL, CCTL, CCTL, CCTL,
+ CCTL, CCTL, CCTL, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CNL, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CDQUOTE, CWORD, CVAR, CWORD,
+ CWORD, CSQUOTE, CLP, CRP,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CBACK, CWORD,
+ CWORD, CWORD, CBQUOTE, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CENDVAR,
+ CWORD
+};
+
+/* character classification table */
+static const char is_type[257] = {
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, ISSPECL,
+ 0, ISSPECL, ISSPECL, 0,
+ 0, 0, 0, 0,
+ ISSPECL, 0, 0, ISSPECL,
+ 0, 0, ISDIGIT, ISDIGIT,
+ ISDIGIT, ISDIGIT, ISDIGIT, ISDIGIT,
+ ISDIGIT, ISDIGIT, ISDIGIT, ISDIGIT,
+ 0, 0, 0, 0,
+ 0, ISSPECL, ISSPECL, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, 0, 0, 0,
+ 0, ISUNDER, 0, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, 0, 0, 0,
+ 0
+};
+/* $NetBSD: trap.c,v 1.25 2001/02/04 19:52:07 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Sigmode records the current value of the signal handlers for the various
+ * modes. A value of zero means that the current handler is not known.
+ * S_HARD_IGN indicates that the signal was ignored on entry to the shell,
+ */
+
+/*
+ * The trap builtin.
+ */
+
+static int
+trapcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char *action;
+ char **ap;
+ int signo;
+
+ if (argc <= 1) {
+ for (signo = 0 ; signo < NSIG ; signo++) {
+ if (trap[signo] != NULL) {
+ char *p;
+
+ p = single_quote(trap[signo]);
+ out1fmt("trap -- %s %s\n", p,
+ signal_names[signo] + (signo ? 3 : 0)
+ );
+ stunalloc(p);
+ }
+ }
+ return 0;
+ }
+ ap = argv + 1;
+ if (argc == 2)
+ action = NULL;
+ else
+ action = *ap++;
+ while (*ap) {
+ if ((signo = decode_signal(*ap, 0)) < 0)
+ error("%s: bad trap", *ap);
+ INTOFF;
+ if (action) {
+ if (action[0] == '-' && action[1] == '\0')
+ action = NULL;
+ else
+ action = savestr(action);
+ }
+ if (trap[signo])
+ ckfree(trap[signo]);
+ trap[signo] = action;
+ if (signo != 0)
+ setsignal(signo);
+ INTON;
+ ap++;
+ }
+ return 0;
+}
+
+
+
+/*
+ * Clear traps on a fork.
+ */
+
+static void
+clear_traps() {
+ char **tp;
+
+ for (tp = trap ; tp < &trap[NSIG] ; tp++) {
+ if (*tp && **tp) { /* trap not NULL or SIG_IGN */
+ INTOFF;
+ ckfree(*tp);
+ *tp = NULL;
+ if (tp != &trap[0])
+ setsignal(tp - trap);
+ INTON;
+ }
+ }
+}
+
+
+
+/*
+ * Set the signal handler for the specified signal. The routine figures
+ * out what it should be set to.
+ */
+
+static void
+setsignal(signo)
+ int signo;
+{
+ int action;
+ char *t;
+ struct sigaction act;
+
+ if ((t = trap[signo]) == NULL)
+ action = S_DFL;
+ else if (*t != '\0')
+ action = S_CATCH;
+ else
+ action = S_IGN;
+ if (rootshell && action == S_DFL) {
+ switch (signo) {
+ case SIGINT:
+ if (iflag || minusc || sflag == 0)
+ action = S_CATCH;
+ break;
+ case SIGQUIT:
+#ifdef DEBUG
+ {
+ extern int debug;
+
+ if (debug)
+ break;
+ }
+#endif
+ /* FALLTHROUGH */
+ case SIGTERM:
+ if (iflag)
+ action = S_IGN;
+ break;
+#if JOBS
+ case SIGTSTP:
+ case SIGTTOU:
+ if (mflag)
+ action = S_IGN;
+ break;
+#endif
+ }
+ }
+
+ t = &sigmode[signo - 1];
+ if (*t == 0) {
+ /*
+ * current setting unknown
+ */
+ if (sigaction(signo, 0, &act) == -1) {
+ /*
+ * Pretend it worked; maybe we should give a warning
+ * here, but other shells don't. We don't alter
+ * sigmode, so that we retry every time.
+ */
+ return;
+ }
+ if (act.sa_handler == SIG_IGN) {
+ if (mflag && (signo == SIGTSTP ||
+ signo == SIGTTIN || signo == SIGTTOU)) {
+ *t = S_IGN; /* don't hard ignore these */
+ } else
+ *t = S_HARD_IGN;
+ } else {
+ *t = S_RESET; /* force to be set */
+ }
+ }
+ if (*t == S_HARD_IGN || *t == action)
+ return;
+ switch (action) {
+ case S_CATCH:
+ act.sa_handler = onsig;
+ break;
+ case S_IGN:
+ act.sa_handler = SIG_IGN;
+ break;
+ default:
+ act.sa_handler = SIG_DFL;
+ }
+ *t = action;
+ act.sa_flags = 0;
+ sigemptyset(&act.sa_mask);
+ sigaction(signo, &act, 0);
+}
+
+/*
+ * Ignore a signal.
+ */
+
+static void
+ignoresig(signo)
+ int signo;
+{
+ if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
+ signal(signo, SIG_IGN);
+ }
+ sigmode[signo - 1] = S_HARD_IGN;
+}
+
+
+#ifdef mkinit
+INCLUDE <signal.h>
+INCLUDE "trap.h"
+
+SHELLPROC {
+ char *sm;
+
+ clear_traps();
+ for (sm = sigmode ; sm < sigmode + NSIG - 1; sm++) {
+ if (*sm == S_IGN)
+ *sm = S_HARD_IGN;
+ }
+}
+#endif
+
+
+
+/*
+ * Signal handler.
+ */
+
+static void
+onsig(signo)
+ int signo;
+{
+ if (signo == SIGINT && trap[SIGINT] == NULL) {
+ onint();
+ return;
+ }
+ gotsig[signo - 1] = 1;
+ pendingsigs++;
+}
+
+
+
+/*
+ * Called to execute a trap. Perhaps we should avoid entering new trap
+ * handlers while we are executing a trap handler.
+ */
+
+static void
+dotrap() {
+ int i;
+ int savestatus;
+
+ for (;;) {
+ for (i = 1 ; ; i++) {
+ if (gotsig[i - 1])
+ break;
+ if (i >= NSIG - 1)
+ goto done;
+ }
+ gotsig[i - 1] = 0;
+ savestatus=exitstatus;
+ evalstring(trap[i], 0);
+ exitstatus=savestatus;
+ }
+done:
+ pendingsigs = 0;
+}
+
+
+
+/*
+ * Controls whether the shell is interactive or not.
+ */
+
+
+static void
+setinteractive(on)
+ int on;
+{
+ static int is_interactive;
+
+ if (on == is_interactive)
+ return;
+ setsignal(SIGINT);
+ setsignal(SIGQUIT);
+ setsignal(SIGTERM);
+ chkmail(1);
+ is_interactive = on;
+}
+
+
+
+/*
+ * Called to exit the shell.
+ */
+
+static void
+exitshell(status)
+ int status;
+{
+ struct jmploc loc1, loc2;
+ char *p;
+
+ TRACE(("exitshell(%d) pid=%d\n", status, getpid()));
+ if (setjmp(loc1.loc)) {
+ goto l1;
+ }
+ if (setjmp(loc2.loc)) {
+ goto l2;
+ }
+ handler = &loc1;
+ if ((p = trap[0]) != NULL && *p != '\0') {
+ trap[0] = NULL;
+ evalstring(p, 0);
+ }
+l1: handler = &loc2; /* probably unnecessary */
+ flushall();
+#if JOBS
+ setjobctl(0);
+#endif
+l2: _exit(status);
+ /* NOTREACHED */
+}
+
+static int decode_signal(const char *string, int minsig)
+{
+ int signo;
+
+ if (is_number(string)) {
+ signo = atoi(string);
+ if (signo >= NSIG) {
+ return -1;
+ }
+ return signo;
+ }
+
+ signo = minsig;
+ if (!signo) {
+ goto zero;
+ }
+ for (; signo < NSIG; signo++) {
+ if (!strcasecmp(string, &(signal_names[signo])[3])) {
+ return signo;
+ }
+zero:
+ if (!strcasecmp(string, signal_names[signo])) {
+ return signo;
+ }
+ }
+
+ return -1;
+}
+/* $NetBSD: var.c,v 1.27 2001/02/04 19:52:07 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#define VTABSIZE 39
+
+
+struct varinit {
+ struct var *var;
+ int flags;
+ const char *text;
+ void (*func) __P((const char *));
+};
+
+struct localvar *localvars;
+
+#if ATTY
+struct var vatty;
+#endif
+struct var vifs;
+struct var vmail;
+struct var vmpath;
+struct var vpath;
+struct var vps1;
+struct var vps2;
+struct var vvers;
+struct var voptind;
+
+static const char defpathvar[] =
+ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
+#ifdef IFS_BROKEN
+static const char defifsvar[] = "IFS= \t\n";
+#else
+static const char defifs[] = " \t\n";
+#endif
+
+static const struct varinit varinit[] = {
+#if ATTY
+ { &vatty, VSTRFIXED|VTEXTFIXED|VUNSET, "ATTY=",
+ NULL },
+#endif
+#ifdef IFS_BROKEN
+ { &vifs, VSTRFIXED|VTEXTFIXED, defifsvar,
+#else
+ { &vifs, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS=",
+#endif
+ NULL },
+ { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=",
+ NULL },
+ { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=",
+ NULL },
+ { &vpath, VSTRFIXED|VTEXTFIXED, defpathvar,
+ changepath },
+ /*
+ * vps1 depends on uid
+ */
+ { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ",
+ NULL },
+ { &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1",
+ getoptsreset },
+ { NULL, 0, NULL,
+ NULL }
+};
+
+struct var *vartab[VTABSIZE];
+
+static struct var **hashvar __P((const char *));
+static void showvars __P((const char *, int, int));
+static struct var **findvar __P((struct var **, const char *));
+
+/*
+ * Initialize the varable symbol tables and import the environment
+ */
+
+#ifdef mkinit
+INCLUDE <unistd.h>
+INCLUDE "output.h"
+INCLUDE "var.h"
+static char **environ;
+INIT {
+ char **envp;
+ char ppid[32];
+
+ initvar();
+ for (envp = environ ; *envp ; envp++) {
+ if (strchr(*envp, '=')) {
+ setvareq(*envp, VEXPORT|VTEXTFIXED);
+ }
+ }
+
+ fmtstr(ppid, sizeof(ppid), "%d", (int) getppid());
+ setvar("PPID", ppid, 0);
+}
+#endif
+
+
+/*
+ * This routine initializes the builtin variables. It is called when the
+ * shell is initialized and again when a shell procedure is spawned.
+ */
+
+static void
+initvar() {
+ const struct varinit *ip;
+ struct var *vp;
+ struct var **vpp;
+
+ for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
+ if ((vp->flags & VEXPORT) == 0) {
+ vpp = hashvar(ip->text);
+ vp->next = *vpp;
+ *vpp = vp;
+ vp->text = strdup(ip->text);
+ vp->flags = ip->flags;
+ vp->func = ip->func;
+ }
+ }
+ /*
+ * PS1 depends on uid
+ */
+ if ((vps1.flags & VEXPORT) == 0) {
+ vpp = hashvar("PS1=");
+ vps1.next = *vpp;
+ *vpp = &vps1;
+ vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
+ vps1.flags = VSTRFIXED|VTEXTFIXED;
+ }
+}
+
+/*
+ * Set the value of a variable. The flags argument is ored with the
+ * flags of the variable. If val is NULL, the variable is unset.
+ */
+
+static void
+setvar(name, val, flags)
+ const char *name, *val;
+ int flags;
+{
+ const char *p;
+ int len;
+ int namelen;
+ char *nameeq;
+ int isbad;
+ int vallen = 0;
+
+ isbad = 0;
+ p = name;
+ if (! is_name(*p))
+ isbad = 1;
+ p++;
+ for (;;) {
+ if (! is_in_name(*p)) {
+ if (*p == '\0' || *p == '=')
+ break;
+ isbad = 1;
+ }
+ p++;
+ }
+ namelen = p - name;
+ if (isbad)
+ error("%.*s: bad variable name", namelen, name);
+ len = namelen + 2; /* 2 is space for '=' and '\0' */
+ if (val == NULL) {
+ flags |= VUNSET;
+ } else {
+ len += vallen = strlen(val);
+ }
+ INTOFF;
+ nameeq = ckmalloc(len);
+ memcpy(nameeq, name, namelen);
+ nameeq[namelen] = '=';
+ if (val) {
+ memcpy(nameeq + namelen + 1, val, vallen + 1);
+ } else {
+ nameeq[namelen + 1] = '\0';
+ }
+ setvareq(nameeq, flags);
+ INTON;
+}
+
+
+
+/*
+ * Same as setvar except that the variable and value are passed in
+ * the first argument as name=value. Since the first argument will
+ * be actually stored in the table, it should not be a string that
+ * will go away.
+ */
+
+static void
+setvareq(s, flags)
+ char *s;
+ int flags;
+{
+ struct var *vp, **vpp;
+
+ vpp = hashvar(s);
+ flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
+ if ((vp = *findvar(vpp, s))) {
+ if (vp->flags & VREADONLY) {
+ size_t len = strchr(s, '=') - s;
+ error("%.*s: is read only", len, s);
+ }
+ INTOFF;
+
+ if (vp->func && (flags & VNOFUNC) == 0)
+ (*vp->func)(strchr(s, '=') + 1);
+
+ if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
+ ckfree(vp->text);
+
+ vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
+ vp->flags |= flags;
+ vp->text = s;
+
+ /*
+ * We could roll this to a function, to handle it as
+ * a regular variable function callback, but why bother?
+ */
+ if (iflag && (vp == &vmpath || (vp == &vmail && !mpathset())))
+ chkmail(1);
+ INTON;
+ return;
+ }
+ /* not found */
+ vp = ckmalloc(sizeof (*vp));
+ vp->flags = flags;
+ vp->text = s;
+ vp->next = *vpp;
+ vp->func = NULL;
+ *vpp = vp;
+}
+
+
+
+/*
+ * Process a linked list of variable assignments.
+ */
+
+static void
+listsetvar(mylist)
+ struct strlist *mylist;
+ {
+ struct strlist *lp;
+
+ INTOFF;
+ for (lp = mylist ; lp ; lp = lp->next) {
+ setvareq(savestr(lp->text), 0);
+ }
+ INTON;
+}
+
+
+
+/*
+ * Find the value of a variable. Returns NULL if not set.
+ */
+
+static char *
+lookupvar(name)
+ const char *name;
+ {
+ struct var *v;
+
+ if ((v = *findvar(hashvar(name), name)) && !(v->flags & VUNSET)) {
+ return strchr(v->text, '=') + 1;
+ }
+ return NULL;
+}
+
+
+
+/*
+ * Search the environment of a builtin command.
+ */
+
+static char *
+bltinlookup(name)
+ const char *name;
+{
+ struct strlist *sp;
+
+ for (sp = cmdenviron ; sp ; sp = sp->next) {
+ if (varequal(sp->text, name))
+ return strchr(sp->text, '=') + 1;
+ }
+ return lookupvar(name);
+}
+
+
+
+/*
+ * Generate a list of exported variables. This routine is used to construct
+ * the third argument to execve when executing a program.
+ */
+
+static char **
+environment() {
+ int nenv;
+ struct var **vpp;
+ struct var *vp;
+ char **env;
+ char **ep;
+
+ nenv = 0;
+ for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
+ for (vp = *vpp ; vp ; vp = vp->next)
+ if (vp->flags & VEXPORT)
+ nenv++;
+ }
+ ep = env = stalloc((nenv + 1) * sizeof *env);
+ for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
+ for (vp = *vpp ; vp ; vp = vp->next)
+ if (vp->flags & VEXPORT)
+ *ep++ = vp->text;
+ }
+ *ep = NULL;
+ return env;
+}
+
+
+/*
+ * Called when a shell procedure is invoked to clear out nonexported
+ * variables. It is also necessary to reallocate variables of with
+ * VSTACK set since these are currently allocated on the stack.
+ */
+
+#ifdef mkinit
+static void shprocvar __P((void));
+
+SHELLPROC {
+ shprocvar();
+}
+#endif
+
+static void
+shprocvar() {
+ struct var **vpp;
+ struct var *vp, **prev;
+
+ for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
+ for (prev = vpp ; (vp = *prev) != NULL ; ) {
+ if ((vp->flags & VEXPORT) == 0) {
+ *prev = vp->next;
+ if ((vp->flags & VTEXTFIXED) == 0)
+ ckfree(vp->text);
+ if ((vp->flags & VSTRFIXED) == 0)
+ ckfree(vp);
+ } else {
+ if (vp->flags & VSTACK) {
+ vp->text = savestr(vp->text);
+ vp->flags &=~ VSTACK;
+ }
+ prev = &vp->next;
+ }
+ }
+ }
+ initvar();
+}
+
+
+
+/*
+ * Command to list all variables which are set. Currently this command
+ * is invoked from the set command when the set command is called without
+ * any variables.
+ */
+
+static int
+showvarscmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ showvars(nullstr, VUNSET, VUNSET);
+ return 0;
+}
+
+
+
+/*
+ * The export and readonly commands.
+ */
+
+static int
+exportcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct var *vp;
+ char *name;
+ const char *p;
+ int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
+ int pflag;
+
+ listsetvar(cmdenviron);
+ pflag = (nextopt("p") == 'p');
+ if (argc > 1 && !pflag) {
+ while ((name = *argptr++) != NULL) {
+ if ((p = strchr(name, '=')) != NULL) {
+ p++;
+ } else {
+ if ((vp = *findvar(hashvar(name), name))) {
+ vp->flags |= flag;
+ goto found;
+ }
+ }
+ setvar(name, p, flag);
+found:;
+ }
+ } else {
+ showvars(argv[0], flag, 0);
+ }
+ return 0;
+}
+
+
+/*
+ * The "local" command.
+ */
+
+static int
+localcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char *name;
+
+ if (! in_function())
+ error("Not in a function");
+ while ((name = *argptr++) != NULL) {
+ mklocal(name);
+ }
+ return 0;
+}
+
+
+/*
+ * Make a variable a local variable. When a variable is made local, it's
+ * value and flags are saved in a localvar structure. The saved values
+ * will be restored when the shell function returns. We handle the name
+ * "-" as a special case.
+ */
+
+static void
+mklocal(name)
+ char *name;
+ {
+ struct localvar *lvp;
+ struct var **vpp;
+ struct var *vp;
+
+ INTOFF;
+ lvp = ckmalloc(sizeof (struct localvar));
+ if (name[0] == '-' && name[1] == '\0') {
+ char *p;
+ p = ckmalloc(sizeof optlist);
+ lvp->text = memcpy(p, optlist, sizeof optlist);
+ vp = NULL;
+ } else {
+ vpp = hashvar(name);
+ vp = *findvar(vpp, name);
+ if (vp == NULL) {
+ if (strchr(name, '='))
+ setvareq(savestr(name), VSTRFIXED);
+ else
+ setvar(name, NULL, VSTRFIXED);
+ vp = *vpp; /* the new variable */
+ lvp->text = NULL;
+ lvp->flags = VUNSET;
+ } else {
+ lvp->text = vp->text;
+ lvp->flags = vp->flags;
+ vp->flags |= VSTRFIXED|VTEXTFIXED;
+ if (strchr(name, '='))
+ setvareq(savestr(name), 0);
+ }
+ }
+ lvp->vp = vp;
+ lvp->next = localvars;
+ localvars = lvp;
+ INTON;
+}
+
+
+/*
+ * Called after a function returns.
+ */
+
+static void
+poplocalvars() {
+ struct localvar *lvp;
+ struct var *vp;
+
+ while ((lvp = localvars) != NULL) {
+ localvars = lvp->next;
+ vp = lvp->vp;
+ if (vp == NULL) { /* $- saved */
+ memcpy(optlist, lvp->text, sizeof optlist);
+ ckfree(lvp->text);
+ } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
+ (void)unsetvar(vp->text);
+ } else {
+ if ((vp->flags & VTEXTFIXED) == 0)
+ ckfree(vp->text);
+ vp->flags = lvp->flags;
+ vp->text = lvp->text;
+ }
+ ckfree(lvp);
+ }
+}
+
+
+static int
+setvarcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ if (argc <= 2)
+ return unsetcmd(argc, argv);
+ else if (argc == 3)
+ setvar(argv[1], argv[2], 0);
+ else
+ error("List assignment not implemented");
+ return 0;
+}
+
+
+/*
+ * The unset builtin command. We unset the function before we unset the
+ * variable to allow a function to be unset when there is a readonly variable
+ * with the same name.
+ */
+
+static int
+unsetcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char **ap;
+ int i;
+ int flg_func = 0;
+ int flg_var = 0;
+ int ret = 0;
+
+ while ((i = nextopt("vf")) != '\0') {
+ if (i == 'f')
+ flg_func = 1;
+ else
+ flg_var = 1;
+ }
+ if (flg_func == 0 && flg_var == 0)
+ flg_var = 1;
+
+ for (ap = argptr; *ap ; ap++) {
+ if (flg_func)
+ unsetfunc(*ap);
+ if (flg_var)
+ ret |= unsetvar(*ap);
+ }
+ return ret;
+}
+
+
+/*
+ * Unset the specified variable.
+ */
+
+static int
+unsetvar(s)
+ const char *s;
+ {
+ struct var **vpp;
+ struct var *vp;
+
+ vpp = findvar(hashvar(s), s);
+ vp = *vpp;
+ if (vp) {
+ if (vp->flags & VREADONLY)
+ return (1);
+ INTOFF;
+ if (*(strchr(vp->text, '=') + 1) != '\0')
+ setvar(s, nullstr, 0);
+ vp->flags &= ~VEXPORT;
+ vp->flags |= VUNSET;
+ if ((vp->flags & VSTRFIXED) == 0) {
+ if ((vp->flags & VTEXTFIXED) == 0)
+ ckfree(vp->text);
+ *vpp = vp->next;
+ ckfree(vp);
+ }
+ INTON;
+ return (0);
+ }
+
+ return (0);
+}
+
+
+
+/*
+ * Find the appropriate entry in the hash table from the name.
+ */
+
+static struct var **
+hashvar(p)
+ const char *p;
+ {
+ unsigned int hashval;
+
+ hashval = ((unsigned char) *p) << 4;
+ while (*p && *p != '=')
+ hashval += (unsigned char) *p++;
+ return &vartab[hashval % VTABSIZE];
+}
+
+
+
+/*
+ * Returns true if the two strings specify the same varable. The first
+ * variable name is terminated by '='; the second may be terminated by
+ * either '=' or '\0'.
+ */
+
+static int
+varequal(p, q)
+ const char *p, *q;
+ {
+ while (*p == *q++) {
+ if (*p++ == '=')
+ return 1;
+ }
+ if (*p == '=' && *(q - 1) == '\0')
+ return 1;
+ return 0;
+}
+
+static void
+showvars(const char *myprefix, int mask, int xor)
+{
+ struct var **vpp;
+ struct var *vp;
+ const char *sep = myprefix == nullstr ? myprefix : spcstr;
+
+ for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
+ for (vp = *vpp ; vp ; vp = vp->next) {
+ if ((vp->flags & mask) ^ xor) {
+ char *p;
+ int len;
+
+ p = strchr(vp->text, '=') + 1;
+ len = p - vp->text;
+ p = single_quote(p);
+
+ out1fmt(
+ "%s%s%.*s%s\n", myprefix, sep, len,
+ vp->text, p
+ );
+ stunalloc(p);
+ }
+ }
+ }
+}
+
+static struct var **
+findvar(struct var **vpp, const char *name)
+{
+ for (; *vpp; vpp = &(*vpp)->next) {
+ if (varequal((*vpp)->text, name)) {
+ break;
+ }
+ }
+ return vpp;
+}
+
+/*
+ * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
+ * This file contains code for the times builtin.
+ * $Id: ash.c,v 1.1 2001/06/28 07:25:15 andersen Exp $
+ */
+static int timescmd (int argc, char **argv)
+{
+ struct tms buf;
+ long int clk_tck = sysconf(_SC_CLK_TCK);
+
+ times(&buf);
+ printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
+ (int) (buf.tms_utime / clk_tck / 60),
+ ((double) buf.tms_utime) / clk_tck,
+ (int) (buf.tms_stime / clk_tck / 60),
+ ((double) buf.tms_stime) / clk_tck,
+ (int) (buf.tms_cutime / clk_tck / 60),
+ ((double) buf.tms_cutime) / clk_tck,
+ (int) (buf.tms_cstime / clk_tck / 60),
+ ((double) buf.tms_cstime) / clk_tck);
+ return 0;
+}
+
--- /dev/null
+/*-
+ * Copyright (c) 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* $NetBSD: alias.h,v 1.4 1995/05/11 21:28:42 christos Exp $ */
+
+#define ALIASINUSE 1
+#define ALIASDEAD 2
+
+struct alias {
+ struct alias *next;
+ char *name;
+ char *val;
+ int flag;
+};
+
+struct alias *lookupalias __P((const char *, int));
+static int aliascmd __P((int, char **));
+static int unaliascmd __P((int, char **));
+static void rmaliases __P((void));
+static int unalias __P((char *));
+static void printalias __P((const struct alias *));
+#define ARITH_NUM 257
+#define ARITH_LPAREN 258
+#define ARITH_RPAREN 259
+#define ARITH_OR 260
+#define ARITH_AND 261
+#define ARITH_BOR 262
+#define ARITH_BXOR 263
+#define ARITH_BAND 264
+#define ARITH_EQ 265
+#define ARITH_NE 266
+#define ARITH_LT 267
+#define ARITH_GT 268
+#define ARITH_GE 269
+#define ARITH_LE 270
+#define ARITH_LSHIFT 271
+#define ARITH_RSHIFT 272
+#define ARITH_ADD 273
+#define ARITH_SUB 274
+#define ARITH_MUL 275
+#define ARITH_DIV 276
+#define ARITH_REM 277
+#define ARITH_UNARYMINUS 278
+#define ARITH_UNARYPLUS 279
+#define ARITH_NOT 280
+#define ARITH_BNOT 281
+
+/*
+ * This file was generated by the mkbuiltins program.
+ */
+
+
+#define BUILTIN_SPECIAL 0x1
+#define BUILTIN_REGULAR 0x2
+#define BUILTIN_ASSIGN 0x4
+
+struct builtincmd {
+ const char *name;
+ int (*const builtinfunc) __P((int, char **));
+ unsigned flags;
+};
+
+extern const struct builtincmd builtincmds[];
+
+
+
+/* $NetBSD: cd.h,v 1.2 1997/07/04 21:01:52 christos Exp $ */
+static int cdcmd __P((int, char **));
+static int pwdcmd __P((int, char **));
+static void setpwd __P((const char *, int));
+
+
+/* $NetBSD: error.h,v 1.14 2001/02/04 19:52:06 christos Exp $ */
+
+/*
+ * Types of operations (passed to the errmsg routine).
+ */
+
+#define E_OPEN 01 /* opening a file */
+#define E_CREAT 02 /* creating a file */
+#define E_EXEC 04 /* executing a program */
+
+
+/*
+ * We enclose jmp_buf in a structure so that we can declare pointers to
+ * jump locations. The global variable handler contains the location to
+ * jump to when an exception occurs, and the global variable exception
+ * contains a code identifying the exeception. To implement nested
+ * exception handlers, the user should save the value of handler on entry
+ * to an inner scope, set handler to point to a jmploc structure for the
+ * inner scope, and restore handler on exit from the scope.
+ */
+
+struct jmploc {
+ jmp_buf loc;
+};
+
+extern struct jmploc *handler;
+extern int exception;
+
+/* exceptions */
+#define EXINT 0 /* SIGINT received */
+#define EXERROR 1 /* a generic error */
+#define EXSHELLPROC 2 /* execute a shell procedure */
+#define EXEXEC 3 /* command execution failed */
+
+
+/*
+ * These macros allow the user to suspend the handling of interrupt signals
+ * over a period of time. This is similar to SIGHOLD to or sigblock, but
+ * much more efficient and portable. (But hacking the kernel is so much
+ * more fun than worrying about efficiency and portability. :-))
+ */
+
+extern int suppressint;
+extern volatile int intpending;
+
+#define INTOFF suppressint++
+#ifdef REALLY_SMALL
+static void __inton __P((void));
+#define INTON __inton()
+#else
+#define INTON { if (--suppressint == 0 && intpending) onint(); }
+#endif
+#define FORCEINTON {suppressint = 0; if (intpending) onint();}
+#define CLEAR_PENDING_INT intpending = 0
+#define int_pending() intpending
+
+static void exraise __P((int)) __attribute__((__noreturn__));
+static void onint __P((void));
+static void error __P((const char *, ...)) __attribute__((__noreturn__));
+static void exerror __P((int, const char *, ...)) __attribute__((__noreturn__));
+static const char *errmsg __P((int, int));
+
+
+/*
+ * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
+ * so we use _setjmp instead.
+ */
+
+#if defined(BSD) && !defined(__SVR4) && !defined(__GLIBC__)
+#define setjmp(jmploc) _setjmp(jmploc)
+#define longjmp(jmploc, val) _longjmp(jmploc, val)
+#endif
+
+
+
+/* $NetBSD: shell.h,v 1.13 2000/05/22 10:18:47 elric Exp $ */
+
+/*
+ * The follow should be set to reflect the type of system you have:
+ * JOBS -> 1 if you have Berkeley job control, 0 otherwise.
+ * SHORTNAMES -> 1 if your linker cannot handle long names.
+ * define BSD if you are running 4.2 BSD or later.
+ * define SYSV if you are running under System V.
+ * define DEBUG=1 to compile in debugging (set global "debug" to turn on)
+ * define DEBUG=2 to compile in and turn on debugging.
+ *
+ * When debugging is on, debugging info will be written to $HOME/trace and
+ * a quit signal will generate a core dump.
+ */
+
+
+#define JOBS 1
+#ifndef BSD
+#define BSD 1
+#endif
+
+#ifdef __STDC__
+typedef void *pointer;
+#ifndef NULL
+#define NULL (void *)0
+#endif
+#else /* not __STDC__ */
+typedef char *pointer;
+#ifndef NULL
+#define NULL 0
+#endif
+#endif /* not __STDC__ */
+
+extern char nullstr[1]; /* null string */
+
+
+#ifdef DEBUG
+#define TRACE(param) trace param
+#else
+#define TRACE(param)
+#endif
+
+
+
+
+/*
+ * This file was generated by the mknodes program.
+ */
+
+#define NSEMI 0
+#define NCMD 1
+#define NPIPE 2
+#define NREDIR 3
+#define NBACKGND 4
+#define NSUBSHELL 5
+#define NAND 6
+#define NOR 7
+#define NIF 8
+#define NWHILE 9
+#define NUNTIL 10
+#define NFOR 11
+#define NCASE 12
+#define NCLIST 13
+#define NDEFUN 14
+#define NARG 15
+#define NTO 16
+#define NFROM 17
+#define NFROMTO 18
+#define NAPPEND 19
+#define NTOOV 20
+#define NTOFD 21
+#define NFROMFD 22
+#define NHERE 23
+#define NXHERE 24
+#define NNOT 25
+
+
+
+struct nbinary {
+ int type;
+ union node *ch1;
+ union node *ch2;
+};
+
+
+struct ncmd {
+ int type;
+ int backgnd;
+ union node *assign;
+ union node *args;
+ union node *redirect;
+};
+
+
+struct npipe {
+ int type;
+ int backgnd;
+ struct nodelist *cmdlist;
+};
+
+
+struct nredir {
+ int type;
+ union node *n;
+ union node *redirect;
+};
+
+
+struct nif {
+ int type;
+ union node *test;
+ union node *ifpart;
+ union node *elsepart;
+};
+
+
+struct nfor {
+ int type;
+ union node *args;
+ union node *body;
+ char *var;
+};
+
+
+struct ncase {
+ int type;
+ union node *expr;
+ union node *cases;
+};
+
+
+struct nclist {
+ int type;
+ union node *next;
+ union node *pattern;
+ union node *body;
+};
+
+
+struct narg {
+ int type;
+ union node *next;
+ char *text;
+ struct nodelist *backquote;
+};
+
+
+struct nfile {
+ int type;
+ union node *next;
+ int fd;
+ union node *fname;
+ char *expfname;
+};
+
+
+struct ndup {
+ int type;
+ union node *next;
+ int fd;
+ int dupfd;
+ union node *vname;
+};
+
+
+struct nhere {
+ int type;
+ union node *next;
+ int fd;
+ union node *doc;
+};
+
+
+struct nnot {
+ int type;
+ union node *com;
+};
+
+
+union node {
+ int type;
+ struct nbinary nbinary;
+ struct ncmd ncmd;
+ struct npipe npipe;
+ struct nredir nredir;
+ struct nif nif;
+ struct nfor nfor;
+ struct ncase ncase;
+ struct nclist nclist;
+ struct narg narg;
+ struct nfile nfile;
+ struct ndup ndup;
+ struct nhere nhere;
+ struct nnot nnot;
+};
+
+
+struct nodelist {
+ struct nodelist *next;
+ union node *n;
+};
+
+
+#ifdef __STDC__
+union node *copyfunc(union node *);
+static void freefunc(union node *);
+#else
+union node *copyfunc();
+static void freefunc();
+#endif
+
+
+
+/* $NetBSD: eval.h,v 1.10 2000/01/27 23:39:40 christos Exp $ */
+extern char *commandname; /* currently executing command */
+extern int exitstatus; /* exit status of last command */
+extern struct strlist *cmdenviron; /* environment for builtin command */
+
+
+struct backcmd { /* result of evalbackcmd */
+ int fd; /* file descriptor to read from */
+ char *buf; /* buffer */
+ int nleft; /* number of chars in buffer */
+ struct job *jp; /* job structure for command */
+};
+
+static int evalcmd __P((int, char **));
+static void evalstring __P((char *, int));
+static void evaltree __P((union node *, int));
+static void evalbackcmd __P((union node *, struct backcmd *));
+static int bltincmd __P((int, char **));
+static int breakcmd __P((int, char **));
+static int returncmd __P((int, char **));
+static int execcmd __P((int, char **));
+
+/* in_function returns nonzero if we are currently evaluating a function */
+#define in_function() funcnest
+extern int funcnest;
+extern int evalskip;
+
+/* reasons for skipping commands (see comment on breakcmd routine) */
+#define SKIPBREAK 1
+#define SKIPCONT 2
+#define SKIPFUNC 3
+#define SKIPFILE 4
+
+
+
+
+/* $NetBSD: exec.h,v 1.17 2000/05/22 10:18:47 elric Exp $ */
+
+/* values of cmdtype */
+#define CMDUNKNOWN -1 /* no entry in table for command */
+#define CMDNORMAL 0 /* command is an executable program */
+#define CMDBUILTIN 1 /* command is a shell builtin */
+#define CMDFUNCTION 2 /* command is a shell function */
+
+
+struct cmdentry {
+ int cmdtype;
+ union param {
+ int index;
+ union node *func;
+ const struct builtincmd *cmd;
+ } u;
+};
+
+
+#define DO_ERR 1 /* find_command prints errors */
+#define DO_ABS 2 /* find_command checks absolute paths */
+#define DO_NOFUN 4 /* find_command ignores functions */
+#define DO_BRUTE 8 /* find_command ignores hash table */
+
+extern const char *pathopt; /* set by padvance */
+extern int exerrno; /* last exec error */
+
+static void shellexec __P((char **, char **, const char *, int))
+ __attribute__((noreturn));
+static char *padvance __P((const char **, const char *));
+static int hashcmd __P((int, char **));
+static void find_command __P((char *, struct cmdentry *, int, const char *));
+struct builtincmd *find_builtin __P((char *));
+static void hashcd __P((void));
+static void changepath __P((const char *));
+static void deletefuncs __P((void));
+#ifdef notdef
+static void getcmdentry __P((char *, struct cmdentry *));
+#endif
+static void addcmdentry __P((char *, struct cmdentry *));
+static void defun __P((char *, union node *));
+static void unsetfunc __P((char *));
+#ifdef ASH_TYPE
+static int typecmd __P((int, char **));
+#endif
+static int commandcmd __P((int, char **));
+
+
+
+/* $NetBSD: expand.h,v 1.12 1999/07/09 03:05:50 christos Exp $ */
+struct strlist {
+ struct strlist *next;
+ char *text;
+};
+
+
+struct arglist {
+ struct strlist *list;
+ struct strlist **lastp;
+};
+
+/*
+ * expandarg() flags
+ */
+#define EXP_FULL 0x1 /* perform word splitting & file globbing */
+#define EXP_TILDE 0x2 /* do normal tilde expansion */
+#define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
+#define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
+#define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
+#define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
+
+
+static void expandhere __P((union node *, int));
+static void expandarg __P((union node *, struct arglist *, int));
+#ifdef ASH_MATH_SUPPORT
+static void expari __P((int));
+#endif
+#if !(defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
+static int patmatch __P((char *, char *, int));
+#endif
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN)
+#define rmescapes(p) _rmescapes((p), 0)
+static char *_rmescapes __P((char *, int));
+#else
+static void rmescapes __P((char *));
+#endif
+static int casematch __P((union node *, char *));
+
+
+#ifdef ASH_MATH_SUPPORT
+/* From arith.y */
+static int arith __P((const char *));
+static int expcmd __P((int , char **));
+static void arith_lex_reset __P((void));
+static int yylex __P((void));
+#endif
+
+
+
+
+/* $NetBSD: init.h,v 1.8 1995/05/11 21:29:14 christos Exp $ */
+static void init __P((void));
+static void reset __P((void));
+static void initshellproc __P((void));
+
+
+
+/* $NetBSD: input.h,v 1.12 2000/05/22 10:18:47 elric Exp $ */
+
+/* PEOF (the end of file marker) is defined in syntax.h */
+/*
+ * The input line number. Input.c just defines this variable, and saves
+ * and restores it when files are pushed and popped. The user of this
+ * package must set its value.
+ */
+extern int plinno;
+extern int parsenleft; /* number of characters left in input buffer */
+extern char *parsenextc; /* next character in input buffer */
+
+static char *pfgets __P((char *, int));
+static int pgetc __P((void));
+static int pgetc2 __P((void));
+static int preadbuffer __P((void));
+static void pungetc __P((void));
+static void pushstring __P((char *, int, void *));
+static void popstring __P((void));
+static void setinputfile __P((const char *, int));
+static void setinputfd __P((int, int));
+static void setinputstring __P((char *));
+static void popfile __P((void));
+static void popallfiles __P((void));
+static void closescript __P((void));
+
+#define pgetc_macro() (--parsenleft >= 0? *parsenextc++ : preadbuffer())
+
+
+
+/* $NetBSD: jobs.h,v 1.12 2000/05/22 10:18:47 elric Exp $ */
+
+/* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
+#define FORK_FG 0
+#define FORK_BG 1
+#define FORK_NOJOB 2
+
+
+/*
+ * A job structure contains information about a job. A job is either a
+ * single process or a set of processes contained in a pipeline. In the
+ * latter case, pidlist will be non-NULL, and will point to a -1 terminated
+ * array of pids.
+ */
+
+struct procstat {
+ pid_t pid; /* process id */
+ int status; /* status flags (defined above) */
+ char *cmd; /* text of command being run */
+};
+
+
+/* states */
+#define JOBSTOPPED 1 /* all procs are stopped */
+#define JOBDONE 2 /* all procs are completed */
+
+
+struct job {
+ struct procstat ps0; /* status of process */
+ struct procstat *ps; /* status or processes when more than one */
+ short nprocs; /* number of processes */
+ short pgrp; /* process group of this job */
+ char state; /* true if job is finished */
+ char used; /* true if this entry is in used */
+ char changed; /* true if status has changed */
+#if JOBS
+ char jobctl; /* job running under job control */
+#endif
+};
+
+extern short backgndpid; /* pid of last background process */
+extern int job_warning; /* user was warned about stopped jobs */
+
+static void setjobctl __P((int));
+static int killcmd __P((int, char **));
+static int fgcmd __P((int, char **));
+static int bgcmd __P((int, char **));
+static int jobscmd __P((int, char **));
+static void showjobs __P((int));
+static int waitcmd __P((int, char **));
+struct job *makejob __P((union node *, int));
+static int forkshell __P((struct job *, union node *, int));
+static int waitforjob __P((struct job *));
+static int stoppedjobs __P((void));
+static char *commandtext __P((union node *));
+
+#if ! JOBS
+#define setjobctl(on) /* do nothing */
+#endif
+
+
+
+/* $NetBSD: machdep.h,v 1.8 1995/05/11 21:29:21 christos Exp $ */
+
+/*
+ * Most machines require the value returned from malloc to be aligned
+ * in some way. The following macro will get this right on many machines.
+ */
+
+#ifndef ALIGN
+union align {
+ int i;
+ char *cp;
+};
+
+#define ALIGN(nbytes) (((nbytes) + sizeof(union align) - 1) & ~(sizeof(union align) - 1))
+#endif
+
+
+
+/* $NetBSD: mail.h,v 1.8 1995/05/11 21:29:23 christos Exp $ */
+
+static void chkmail __P((int));
+
+
+
+/* $NetBSD: main.h,v 1.8 1995/05/11 21:29:27 christos Exp $ */
+extern int rootpid; /* pid of main shell */
+extern int rootshell; /* true if we aren't a child of the main shell */
+
+static void readcmdfile __P((char *));
+static void cmdloop __P((int));
+static int dotcmd __P((int, char **));
+static int exitcmd __P((int, char **));
+
+
+
+/* $NetBSD: memalloc.h,v 1.11 2000/11/01 19:56:01 christos Exp $ */
+struct stackmark {
+ struct stack_block *stackp;
+ char *stacknxt;
+ int stacknleft;
+ struct stackmark *marknext;
+};
+
+
+extern char *stacknxt;
+extern int stacknleft;
+extern int sstrnleft;
+extern int herefd;
+
+static inline pointer ckmalloc (int sz) { return xmalloc(sz); }
+static inline pointer ckrealloc(void *p, int sz) { return xrealloc(p, sz); }
+static inline char * savestr (const char *s) { return xstrdup(s); }
+
+pointer stalloc __P((int));
+static void stunalloc __P((pointer));
+static void setstackmark __P((struct stackmark *));
+static void popstackmark __P((struct stackmark *));
+static void growstackblock __P((void));
+static void grabstackblock __P((int));
+static char *growstackstr __P((void));
+static char *makestrspace __P((size_t));
+static void ungrabstackstr __P((char *, char *));
+
+
+
+#define stackblock() stacknxt
+#define stackblocksize() stacknleft
+#define STARTSTACKSTR(p) p = stackblock(), sstrnleft = stackblocksize()
+#define STPUTC(c, p) (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
+#define CHECKSTRSPACE(n, p) { if (sstrnleft < n) p = makestrspace(n); }
+#define USTPUTC(c, p) (--sstrnleft, *p++ = (c))
+#define STACKSTRNUL(p) (sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
+#define STUNPUTC(p) (++sstrnleft, --p)
+#define STTOPC(p) p[-1]
+#define STADJUST(amount, p) (p += (amount), sstrnleft -= (amount))
+#define grabstackstr(p) stalloc(stackblocksize() - sstrnleft)
+
+#define ckfree(p) free((pointer)(p))
+
+
+
+/* $NetBSD: miscbltin.h,v 1.1 1997/07/04 21:02:10 christos Exp $ */
+static int readcmd __P((int, char **));
+static int umaskcmd __P((int, char **));
+static int ulimitcmd __P((int, char **));
+
+
+
+/* $NetBSD: mystring.h,v 1.9 1995/05/11 21:29:42 christos Exp $ */
+
+extern const char snlfmt[];
+extern const char spcstr[];
+
+#if 0
+static void scopyn __P((const char *, char *, int));
+#endif
+static int prefix __P((const char *, const char *));
+static int number __P((const char *));
+static int is_number __P((const char *));
+static char *single_quote __P((const char *));
+static char *sstrdup __P((const char *));
+static int pstrcmp __P((const void *, const void *));
+static const char *const *findstring __P((const char *, const char *const *, size_t));
+
+#define equal(s1, s2) (strcmp(s1, s2) == 0)
+#define scopy(s1, s2) ((void)strcpy(s2, s1))
+
+
+/* $NetBSD: options.h,v 1.14 2001/02/04 19:52:06 christos Exp $ */
+
+struct shparam {
+ int nparam; /* # of positional parameters (without $0) */
+ unsigned char malloc; /* if parameter list dynamically allocated */
+ char **p; /* parameter list */
+ int optind; /* next parameter to be processed by getopts */
+ int optoff; /* used by getopts */
+};
+
+
+
+#define eflag optlist[0].val
+#define fflag optlist[1].val
+#define Iflag optlist[2].val
+#define iflag optlist[3].val
+#define mflag optlist[4].val
+#define nflag optlist[5].val
+#define sflag optlist[6].val
+#define xflag optlist[7].val
+#define vflag optlist[8].val
+#define Vflag optlist[9].val
+#define Eflag optlist[10].val
+#define Cflag optlist[11].val
+#define aflag optlist[12].val
+#define bflag optlist[13].val
+#define uflag optlist[14].val
+#define qflag optlist[15].val
+
+#define NOPTS 16
+
+struct optent {
+ const char *name;
+ const char letter;
+ char val;
+};
+
+extern struct optent optlist[NOPTS];
+
+
+extern char *minusc; /* argument to -c option */
+extern char *arg0; /* $0 */
+extern struct shparam shellparam; /* $@ */
+extern char **argptr; /* argument list for builtin commands */
+extern char *optionarg; /* set by nextopt */
+extern char *optptr; /* used by nextopt */
+
+static void procargs __P((int, char **));
+static void optschanged __P((void));
+static void setparam __P((char **));
+static void freeparam __P((volatile struct shparam *));
+static int shiftcmd __P((int, char **));
+static int setcmd __P((int, char **));
+#ifdef ASH_GETOPTS
+static int getoptscmd __P((int, char **));
+static int setvarsafe __P((const char *, const char *, int));
+#endif
+static int nextopt __P((const char *));
+static void getoptsreset __P((const char *));
+
+
+
+/* $NetBSD: output.h,v 1.14 1998/01/31 12:37:55 christos Exp $ */
+struct output {
+#ifdef USE_GLIBC_STDIO
+ FILE *stream;
+#endif
+ char *nextc;
+ int nleft;
+ char *buf;
+ int bufsize;
+ int fd;
+ short flags;
+};
+
+extern struct output output;
+extern struct output errout;
+extern struct output memout;
+extern struct output *out1;
+extern struct output *out2;
+
+static void outstr __P((const char *, struct output *));
+#ifndef USE_GLIBC_STDIO
+static void outcslow __P((char, struct output *));
+#endif
+static void flushall __P((void));
+static void flushout __P((struct output *));
+static void freestdout __P((void));
+static void outfmt __P((struct output *, const char *, ...))
+ __attribute__((__format__(__printf__,2,3)));
+static void out1fmt __P((const char *, ...))
+ __attribute__((__format__(__printf__,1,2)));
+static void fmtstr __P((char *, size_t, const char *, ...))
+ __attribute__((__format__(__printf__,3,4)));
+#ifndef USE_GLIBC_STDIO
+static void doformat __P((struct output *, const char *, va_list));
+#endif
+static int xwrite __P((int, const char *, int));
+#ifdef USE_GLIBC_STDIO
+static void initstreams __P((void));
+static void openmemout __P((void));
+static int __closememout __P((void));
+#endif
+
+#define OUTPUT_ERR 01 /* error occurred on output */
+
+#ifdef USE_GLIBC_STDIO
+#define outc(c, o) putc((c), (o)->stream)
+#define doformat(d, f, a) vfprintf((d)->stream, (f), (a))
+#else
+#define outc(c, file) (--(file)->nleft < 0? outcslow((c), (file)) : (*(file)->nextc = (c), (file)->nextc++))
+#endif
+#define out1c(c) outc((c), out1)
+#define out2c(c) outc((c), out2)
+#define out1str(s) outstr((s), out1)
+#define out2str(s) outstr((s), out2)
+#define outerr(f) ((f)->flags & OUTPUT_ERR)
+
+
+
+/* $NetBSD: parser.h,v 1.14 2000/07/27 04:09:28 cgd Exp $ */
+/* control characters in argument strings */
+#define CTLESC '\201'
+#define CTLVAR '\202'
+#define CTLENDVAR '\203'
+#define CTLBACKQ '\204'
+#define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
+/* CTLBACKQ | CTLQUOTE == '\205' */
+#define CTLARI '\206'
+#define CTLENDARI '\207'
+#define CTLQUOTEMARK '\210'
+
+/* variable substitution byte (follows CTLVAR) */
+#define VSTYPE 0x0f /* type of variable substitution */
+#define VSNUL 0x10 /* colon--treat the empty string as unset */
+#define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
+
+/* values of VSTYPE field */
+#define VSNORMAL 0x1 /* normal variable: $var or ${var} */
+#define VSMINUS 0x2 /* ${var-text} */
+#define VSPLUS 0x3 /* ${var+text} */
+#define VSQUESTION 0x4 /* ${var?message} */
+#define VSASSIGN 0x5 /* ${var=text} */
+#define VSTRIMLEFT 0x6 /* ${var#pattern} */
+#define VSTRIMLEFTMAX 0x7 /* ${var##pattern} */
+#define VSTRIMRIGHT 0x8 /* ${var%pattern} */
+#define VSTRIMRIGHTMAX 0x9 /* ${var%%pattern} */
+#define VSLENGTH 0xa /* ${#var} */
+
+
+/*
+ * NEOF is returned by parsecmd when it encounters an end of file. It
+ * must be distinct from NULL, so we use the address of a variable that
+ * happens to be handy.
+ */
+extern int tokpushback;
+#define NEOF ((union node *)&tokpushback)
+extern int whichprompt; /* 1 == PS1, 2 == PS2 */
+extern int checkalias;
+
+
+union node *parsecmd(int);
+static void fixredir(union node *, const char *, int);
+static int goodname(char *);
+static const char *getprompt(void *);
+static int isassignment __P((const char *));
+static const char *const *findkwd __P((const char *));
+
+
+/* $NetBSD: redir.h,v 1.12 2000/05/22 10:18:47 elric Exp $ */
+/* flags passed to redirect */
+#define REDIR_PUSH 01 /* save previous values of file descriptors */
+#define REDIR_BACKQ 02 /* save the command output in memory */
+
+extern int fileno2;
+
+static void redirect __P((union node *, int));
+static void popredir __P((void));
+static int fd0_redirected_p __P((void));
+static void clearredir __P((void));
+static int dup_as_newfd __P((int, int));
+
+
+
+
+/* $NetBSD: show.h,v 1.4 1999/10/08 21:10:44 pk Exp $ */
+#ifdef DEBUG
+static void trace __P((const char *, ...));
+static void trargs __P((char **));
+static void showtree __P((union node *));
+static void trputc __P((int));
+static void trputs __P((const char *));
+static void opentrace __P((void));
+#endif
+/*
+ * This file was generated by the mksyntax program.
+ */
+
+#ifdef CEOF
+#undef CEOF
+#endif
+
+/* Syntax classes */
+#define CWORD 0 /* character is nothing special */
+#define CNL 1 /* newline character */
+#define CBACK 2 /* a backslash character */
+#define CSQUOTE 3 /* single quote */
+#define CDQUOTE 4 /* double quote */
+#define CENDQUOTE 5 /* a terminating quote */
+#define CBQUOTE 6 /* backwards single quote */
+#define CVAR 7 /* a dollar sign */
+#define CENDVAR 8 /* a '}' character */
+#define CLP 9 /* a left paren in arithmetic */
+#define CRP 10 /* a right paren in arithmetic */
+#define CEOF 11 /* end of file */
+#define CCTL 12 /* like CWORD, except it must be escaped */
+#define CSPCL 13 /* these terminate a word */
+#define CIGN 14 /* character should be ignored */
+
+/* Syntax classes for is_ functions */
+#define ISDIGIT 01 /* a digit */
+#define ISUPPER 02 /* an upper case letter */
+#define ISLOWER 04 /* a lower case letter */
+#define ISUNDER 010 /* an underscore */
+#define ISSPECL 020 /* the name of a special parameter */
+
+#define SYNBASE 130
+#define PEOF -130
+
+#define PEOA -129
+
+
+#define BASESYNTAX (basesyntax + SYNBASE)
+#define DQSYNTAX (dqsyntax + SYNBASE)
+#define SQSYNTAX (sqsyntax + SYNBASE)
+#define ARISYNTAX (arisyntax + SYNBASE)
+
+#define is_digit(c) ((unsigned)((c) - '0') <= 9)
+#define is_alpha(c) (((c) < CTLESC || (c) > CTLENDARI) && isalpha((unsigned char) (c)))
+#define is_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalpha((unsigned char) (c))))
+#define is_in_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalnum((unsigned char) (c))))
+#define is_special(c) ((is_type+SYNBASE)[c] & (ISSPECL|ISDIGIT))
+#define digit_val(c) ((c) - '0')
+
+extern const char basesyntax[];
+extern const char dqsyntax[];
+extern const char sqsyntax[];
+extern const char arisyntax[];
+extern const char is_type[];
+#define TEOF 0
+#define TNL 1
+#define TSEMI 2
+#define TBACKGND 3
+#define TAND 4
+#define TOR 5
+#define TPIPE 6
+#define TLP 7
+#define TRP 8
+#define TENDCASE 9
+#define TENDBQUOTE 10
+#define TREDIR 11
+#define TWORD 12
+#define TASSIGN 13
+#define TNOT 14
+#define TCASE 15
+#define TDO 16
+#define TDONE 17
+#define TELIF 18
+#define TELSE 19
+#define TESAC 20
+#define TFI 21
+#define TFOR 22
+#define TIF 23
+#define TIN 24
+#define TTHEN 25
+#define TUNTIL 26
+#define TWHILE 27
+#define TBEGIN 28
+#define TEND 29
+
+/* Array indicating which tokens mark the end of a list */
+static const char tokendlist[] = {
+ 1,
+ 0,
+ 0,
+ 0,
+ 0,
+ 0,
+ 0,
+ 0,
+ 1,
+ 1,
+ 1,
+ 0,
+ 0,
+ 0,
+ 0,
+ 0,
+ 1,
+ 1,
+ 1,
+ 1,
+ 1,
+ 1,
+ 0,
+ 0,
+ 0,
+ 1,
+ 0,
+ 0,
+ 0,
+ 1,
+};
+
+static const char *const tokname[] = {
+ "end of file",
+ "newline",
+ "\";\"",
+ "\"&\"",
+ "\"&&\"",
+ "\"||\"",
+ "\"|\"",
+ "\"(\"",
+ "\")\"",
+ "\";;\"",
+ "\"`\"",
+ "redirection",
+ "word",
+ "assignment",
+ "\"!\"",
+ "\"case\"",
+ "\"do\"",
+ "\"done\"",
+ "\"elif\"",
+ "\"else\"",
+ "\"esac\"",
+ "\"fi\"",
+ "\"for\"",
+ "\"if\"",
+ "\"in\"",
+ "\"then\"",
+ "\"until\"",
+ "\"while\"",
+ "\"{\"",
+ "\"}\"",
+};
+
+#define KWDOFFSET 14
+
+static const char *const parsekwd[] = {
+ "!",
+ "case",
+ "do",
+ "done",
+ "elif",
+ "else",
+ "esac",
+ "fi",
+ "for",
+ "if",
+ "in",
+ "then",
+ "until",
+ "while",
+ "{",
+ "}"
+};
+
+
+
+
+/* $NetBSD: trap.h,v 1.14 2000/05/22 10:18:47 elric Exp $ */
+extern int pendingsigs;
+
+static int trapcmd __P((int, char **));
+static void clear_traps __P((void));
+static void setsignal __P((int));
+static void ignoresig __P((int));
+static void onsig __P((int));
+static void dotrap __P((void));
+static void setinteractive __P((int));
+static void exitshell __P((int)) __attribute__((noreturn));
+static int decode_signal __P((const char *, int));
+
+
+
+/* $NetBSD: var.h,v 1.18 2000/05/22 10:18:47 elric Exp $ */
+
+/*
+ * Shell variables.
+ */
+
+/* flags */
+#define VEXPORT 0x01 /* variable is exported */
+#define VREADONLY 0x02 /* variable cannot be modified */
+#define VSTRFIXED 0x04 /* variable struct is staticly allocated */
+#define VTEXTFIXED 0x08 /* text is staticly allocated */
+#define VSTACK 0x10 /* text is allocated on the stack */
+#define VUNSET 0x20 /* the variable is not set */
+#define VNOFUNC 0x40 /* don't call the callback function */
+
+
+struct var {
+ struct var *next; /* next entry in hash list */
+ int flags; /* flags are defined above */
+ char *text; /* name=value */
+ void (*func) __P((const char *));
+ /* function to be called when */
+ /* the variable gets set/unset */
+};
+
+
+struct localvar {
+ struct localvar *next; /* next local variable in list */
+ struct var *vp; /* the variable that was made local */
+ int flags; /* saved flags */
+ char *text; /* saved text */
+};
+
+
+extern struct localvar *localvars;
+
+#if ATTY
+extern struct var vatty;
+#endif
+extern struct var vifs;
+extern struct var vmail;
+extern struct var vmpath;
+extern struct var vpath;
+extern struct var vps1;
+extern struct var vps2;
+#ifndef SMALL
+extern struct var vterm;
+extern struct var vtermcap;
+extern struct var vhistsize;
+#endif
+
+#ifdef IFS_BROKEN
+extern const char defifsvar[];
+#define defifs (defifsvar + 4)
+#else
+extern const char defifs[];
+#endif
+extern const char defpathvar[];
+#define defpath (defpathvar + 5)
+
+/*
+ * The following macros access the values of the above variables.
+ * They have to skip over the name. They return the null string
+ * for unset variables.
+ */
+
+#define ifsval() (vifs.text + 4)
+#define ifsset() ((vifs.flags & VUNSET) == 0)
+#define mailval() (vmail.text + 5)
+#define mpathval() (vmpath.text + 9)
+#define pathval() (vpath.text + 5)
+#define ps1val() (vps1.text + 4)
+#define ps2val() (vps2.text + 4)
+#define optindval() (voptind.text + 7)
+#ifndef SMALL
+#define histsizeval() (vhistsize.text + 9)
+#define termval() (vterm.text + 5)
+#endif
+
+#if ATTY
+#define attyset() ((vatty.flags & VUNSET) == 0)
+#endif
+#define mpathset() ((vmpath.flags & VUNSET) == 0)
+
+static void initvar __P((void));
+static void setvar __P((const char *, const char *, int));
+static void setvareq __P((char *, int));
+struct strlist;
+static void listsetvar __P((struct strlist *));
+static char *lookupvar __P((const char *));
+static char *bltinlookup __P((const char *));
+static char **environment __P((void));
+static void shprocvar __P((void));
+static int showvarscmd __P((int, char **));
+static int exportcmd __P((int, char **));
+static int localcmd __P((int, char **));
+static void mklocal __P((char *));
+static void poplocalvars __P((void));
+static int setvarcmd __P((int, char **));
+static int unsetcmd __P((int, char **));
+static int unsetvar __P((const char *));
+static int varequal __P((const char *, const char *));
+
--- /dev/null
+/*-
+ * Copyright (c) 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#undef _GNU_SOURCE
+#undef ASH_TYPE
+#undef ASH_GETOPTS
+#undef ASH_MATH_SUPPORT
+
+#include <assert.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <paths.h>
+#include <pwd.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/cdefs.h>
+#include <sys/ioctl.h>
+#include <sys/param.h>
+#include <sys/resource.h>
+#include <sys/time.h>
+#include <sys/times.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+
+#if !defined(FNMATCH_BROKEN)
+#include <fnmatch.h>
+#endif
+#if !defined(GLOB_BROKEN)
+#include <glob.h>
+#endif
+
+#if JOBS
+#include <termios.h>
+#undef CEOF /* syntax.h redefines this */
+#endif
+
+#include "cmdedit.h"
+#include "busybox.h"
+#include "ash.h"
+
+
+#define _DIAGASSERT(x)
+
+#define ATABSIZE 39
+
+#define S_DFL 1 /* default signal handling (SIG_DFL) */
+#define S_CATCH 2 /* signal is caught */
+#define S_IGN 3 /* signal is ignored (SIG_IGN) */
+#define S_HARD_IGN 4 /* signal is ignored permenantly */
+#define S_RESET 5 /* temporary - to reset a hard ignored sig */
+
+
+
+struct alias *atab[ATABSIZE];
+
+static void setalias __P((char *, char *));
+static struct alias **hashalias __P((const char *));
+static struct alias *freealias __P((struct alias *));
+static struct alias **__lookupalias __P((const char *));
+static char *trap[NSIG]; /* trap handler commands */
+static char sigmode[NSIG - 1]; /* current value of signal */
+static char gotsig[NSIG - 1]; /* indicates specified signal received */
+static int pendingsigs; /* indicates some signal received */
+
+
+static void
+setalias(name, val)
+ char *name, *val;
+{
+ struct alias *ap, **app;
+
+ app = __lookupalias(name);
+ ap = *app;
+ INTOFF;
+ if (ap) {
+ if (!(ap->flag & ALIASINUSE)) {
+ ckfree(ap->val);
+ }
+ ap->val = savestr(val);
+ ap->flag &= ~ALIASDEAD;
+ } else {
+ /* not found */
+ ap = ckmalloc(sizeof (struct alias));
+ ap->name = savestr(name);
+ ap->val = savestr(val);
+ ap->flag = 0;
+ ap->next = 0;
+ *app = ap;
+ }
+ INTON;
+}
+
+static int
+unalias(name)
+ char *name;
+ {
+ struct alias **app;
+
+ app = __lookupalias(name);
+
+ if (*app) {
+ INTOFF;
+ *app = freealias(*app);
+ INTON;
+ return (0);
+ }
+
+ return (1);
+}
+
+#ifdef mkinit
+static void rmaliases __P((void));
+
+SHELLPROC {
+ rmaliases();
+}
+#endif
+
+static void
+rmaliases() {
+ struct alias *ap, **app;
+ int i;
+
+ INTOFF;
+ for (i = 0; i < ATABSIZE; i++) {
+ app = &atab[i];
+ for (ap = *app; ap; ap = *app) {
+ *app = freealias(*app);
+ if (ap == *app) {
+ app = &ap->next;
+ }
+ }
+ }
+ INTON;
+}
+
+struct alias *
+lookupalias(name, check)
+ const char *name;
+ int check;
+{
+ struct alias *ap = *__lookupalias(name);
+
+ if (check && ap && (ap->flag & ALIASINUSE))
+ return (NULL);
+ return (ap);
+}
+
+
+/*
+ * TODO - sort output
+ */
+static int
+aliascmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char *n, *v;
+ int ret = 0;
+ struct alias *ap;
+
+ if (argc == 1) {
+ int i;
+
+ for (i = 0; i < ATABSIZE; i++)
+ for (ap = atab[i]; ap; ap = ap->next) {
+ printalias(ap);
+ }
+ return (0);
+ }
+ while ((n = *++argv) != NULL) {
+ if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */
+ if ((ap = *__lookupalias(n)) == NULL) {
+ outfmt(out2, "%s: %s not found\n", "alias", n);
+ ret = 1;
+ } else
+ printalias(ap);
+ }
+ else {
+ *v++ = '\0';
+ setalias(n, v);
+ }
+ }
+
+ return (ret);
+}
+
+static int
+unaliascmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int i;
+
+ while ((i = nextopt("a")) != '\0') {
+ if (i == 'a') {
+ rmaliases();
+ return (0);
+ }
+ }
+ for (i = 0; *argptr; argptr++) {
+ if (unalias(*argptr)) {
+ outfmt(out2, "%s: %s not found\n", "unalias", *argptr);
+ i = 1;
+ }
+ }
+
+ return (i);
+}
+
+static struct alias **
+hashalias(p)
+ const char *p;
+ {
+ unsigned int hashval;
+
+ hashval = *p << 4;
+ while (*p)
+ hashval+= *p++;
+ return &atab[hashval % ATABSIZE];
+}
+
+static struct alias *
+freealias(struct alias *ap) {
+ struct alias *next;
+
+ if (ap->flag & ALIASINUSE) {
+ ap->flag |= ALIASDEAD;
+ return ap;
+ }
+
+ next = ap->next;
+ ckfree(ap->name);
+ ckfree(ap->val);
+ ckfree(ap);
+ return next;
+}
+
+static void
+printalias(const struct alias *ap) {
+ char *p;
+
+ p = single_quote(ap->val);
+ out1fmt("alias %s=%s\n", ap->name, p);
+ stunalloc(p);
+}
+
+static struct alias **
+__lookupalias(const char *name) {
+ struct alias **app = hashalias(name);
+
+ for (; *app; app = &(*app)->next) {
+ if (equal(name, (*app)->name)) {
+ break;
+ }
+ }
+
+ return app;
+}
+
+#ifdef ASH_MATH_SUPPORT
+/* The generated file arith.c has been snipped. If you want this
+ * stuff back in, feel free to add it to your own copy. */
+#endif
+
+/*
+ * This file was generated by the mkbuiltins program.
+ */
+
+static int bgcmd __P((int, char **));
+static int breakcmd __P((int, char **));
+static int cdcmd __P((int, char **));
+static int commandcmd __P((int, char **));
+static int dotcmd __P((int, char **));
+static int evalcmd __P((int, char **));
+static int execcmd __P((int, char **));
+static int exitcmd __P((int, char **));
+static int exportcmd __P((int, char **));
+static int histcmd __P((int, char **));
+static int fgcmd __P((int, char **));
+static int hashcmd __P((int, char **));
+static int jobscmd __P((int, char **));
+static int killcmd __P((int, char **));
+static int localcmd __P((int, char **));
+static int pwdcmd __P((int, char **));
+static int readcmd __P((int, char **));
+static int returncmd __P((int, char **));
+static int setcmd __P((int, char **));
+static int setvarcmd __P((int, char **));
+static int shiftcmd __P((int, char **));
+static int trapcmd __P((int, char **));
+static int umaskcmd __P((int, char **));
+static int unaliascmd __P((int, char **));
+static int unsetcmd __P((int, char **));
+static int waitcmd __P((int, char **));
+static int aliascmd __P((int, char **));
+static int ulimitcmd __P((int, char **));
+static int timescmd __P((int, char **));
+#ifdef ASH_MATH_SUPPORT
+static int expcmd __P((int, char **));
+#endif
+#ifdef ASH_TYPE
+static int typecmd __P((int, char **));
+#endif
+#ifdef ASH_GETOPTS
+static int getoptscmd __P((int, char **));
+#endif
+#ifndef BB_TRUE_FALSE
+static int true_main __P((int, char **));
+static int false_main __P((int, char **));
+#endif
+
+static struct builtincmd *DOTCMD;
+static struct builtincmd *BLTINCMD;
+static struct builtincmd *COMMANDCMD;
+static struct builtincmd *EXECCMD;
+static struct builtincmd *EVALCMD;
+
+/* It is CRUCIAL that this listing be kept in ascii order, otherwise
+ * the binary search in find_builtin() will stop working. If you value
+ * your kneecaps, you'll be sure to *make sure* that any changes made
+ * to this array result in the listing remaining in ascii order. You
+ * have been warned.
+ */
+static const struct builtincmd builtincmds[] = {
+ { ".", dotcmd, 1 },
+ { ":", true_main, 1 },
+ { "alias", aliascmd, 6 },
+ { "bg", bgcmd, 2 },
+ { "break", breakcmd, 1 },
+ { "builtin", bltincmd, 1 },
+ { "cd", cdcmd, 2 },
+ { "chdir", cdcmd, 0 },
+ { "command", commandcmd, 2 },
+ { "continue", breakcmd, 1 },
+ { "eval", evalcmd, 1 },
+ { "exec", execcmd, 1 },
+ { "exit", exitcmd, 1 },
+#ifdef ASH_MATH_SUPPORT
+ { "exp", expcmd, 0 },
+#endif
+ { "export", exportcmd, 5 },
+ { "false", false_main, 2 },
+ { "fc", histcmd, 2 },
+ { "fg", fgcmd, 2 },
+#ifdef ASH_GETOPTS
+ { "getopts", getoptscmd, 2 },
+#endif
+ { "hash", hashcmd, 0 },
+ { "jobs", jobscmd, 2 },
+ { "kill", killcmd, 2 },
+#ifdef ASH_MATH_SUPPORT
+ { "let", expcmd, 0 },
+#endif
+ { "local", localcmd, 4 },
+ { "pwd", pwdcmd, 0 },
+ { "read", readcmd, 2 },
+ { "readonly", exportcmd, 5 },
+ { "return", returncmd, 1 },
+ { "set", setcmd, 1 },
+ { "setvar", setvarcmd, 0 },
+ { "shift", shiftcmd, 1 },
+ { "times", timescmd, 1 },
+ { "trap", trapcmd, 1 },
+ { "true", true_main, 2 },
+#ifdef ASH_TYPE
+ { "type", typecmd, 0 },
+#endif
+ { "ulimit", ulimitcmd, 0 },
+ { "umask", umaskcmd, 2 },
+ { "unalias", unaliascmd, 2 },
+ { "unset", unsetcmd, 1 },
+ { "wait", waitcmd, 2 },
+};
+#define NUMBUILTINS (sizeof (builtincmds) / sizeof (struct builtincmd) )
+
+
+/* $NetBSD: cd.c,v 1.27 1999/07/09 03:05:49 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+static int docd __P((char *, int));
+static char *getcomponent __P((void));
+static void updatepwd __P((char *));
+static void getpwd __P((void));
+
+static char *curdir = nullstr; /* current working directory */
+static char *cdcomppath;
+
+#ifdef mkinit
+INCLUDE "cd.h"
+INIT {
+ setpwd(0, 0);
+}
+#endif
+
+static int
+cdcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ const char *dest;
+ const char *path;
+ char *p;
+ struct stat statb;
+ int print = 0;
+
+ nextopt(nullstr);
+ if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME")) == NULL)
+ error("HOME not set");
+ if (*dest == '\0')
+ dest = ".";
+ if (dest[0] == '-' && dest[1] == '\0') {
+ dest = bltinlookup("OLDPWD");
+ if (!dest || !*dest) {
+ dest = curdir;
+ }
+ print = 1;
+ if (dest)
+ print = 1;
+ else
+ dest = ".";
+ }
+ if (*dest == '/' || (path = bltinlookup("CDPATH")) == NULL)
+ path = nullstr;
+ while ((p = padvance(&path, dest)) != NULL) {
+ if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
+ if (!print) {
+ /*
+ * XXX - rethink
+ */
+ if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
+ p += 2;
+ print = strcmp(p, dest);
+ }
+ if (docd(p, print) >= 0)
+ return 0;
+
+ }
+ }
+ error("can't cd to %s", dest);
+ /* NOTREACHED */
+}
+
+
+/*
+ * Actually do the chdir. In an interactive shell, print the
+ * directory name if "print" is nonzero.
+ */
+
+static int
+docd(dest, print)
+ char *dest;
+ int print;
+{
+ char *p;
+ char *q;
+ char *component;
+ struct stat statb;
+ int first;
+ int badstat;
+
+ TRACE(("docd(\"%s\", %d) called\n", dest, print));
+
+ /*
+ * Check each component of the path. If we find a symlink or
+ * something we can't stat, clear curdir to force a getcwd()
+ * next time we get the value of the current directory.
+ */
+ badstat = 0;
+ cdcomppath = sstrdup(dest);
+ STARTSTACKSTR(p);
+ if (*dest == '/') {
+ STPUTC('/', p);
+ cdcomppath++;
+ }
+ first = 1;
+ while ((q = getcomponent()) != NULL) {
+ if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
+ continue;
+ if (! first)
+ STPUTC('/', p);
+ first = 0;
+ component = q;
+ while (*q)
+ STPUTC(*q++, p);
+ if (equal(component, ".."))
+ continue;
+ STACKSTRNUL(p);
+ if ((lstat(stackblock(), &statb) < 0)
+ || (S_ISLNK(statb.st_mode))) {
+ /* print = 1; */
+ badstat = 1;
+ break;
+ }
+ }
+
+ INTOFF;
+ if (chdir(dest) < 0) {
+ INTON;
+ return -1;
+ }
+ updatepwd(badstat ? NULL : dest);
+ INTON;
+ if (print && iflag)
+ out1fmt(snlfmt, curdir);
+ return 0;
+}
+
+
+/*
+ * Get the next component of the path name pointed to by cdcomppath.
+ * This routine overwrites the string pointed to by cdcomppath.
+ */
+
+static char *
+getcomponent() {
+ char *p;
+ char *start;
+
+ if ((p = cdcomppath) == NULL)
+ return NULL;
+ start = cdcomppath;
+ while (*p != '/' && *p != '\0')
+ p++;
+ if (*p == '\0') {
+ cdcomppath = NULL;
+ } else {
+ *p++ = '\0';
+ cdcomppath = p;
+ }
+ return start;
+}
+
+
+
+/*
+ * Update curdir (the name of the current directory) in response to a
+ * cd command. We also call hashcd to let the routines in exec.c know
+ * that the current directory has changed.
+ */
+
+static void
+updatepwd(dir)
+ char *dir;
+ {
+ char *new;
+ char *p;
+ size_t len;
+
+ hashcd(); /* update command hash table */
+
+ /*
+ * If our argument is NULL, we don't know the current directory
+ * any more because we traversed a symbolic link or something
+ * we couldn't stat().
+ */
+ if (dir == NULL || curdir == nullstr) {
+ setpwd(0, 1);
+ return;
+ }
+ len = strlen(dir);
+ cdcomppath = sstrdup(dir);
+ STARTSTACKSTR(new);
+ if (*dir != '/') {
+ p = curdir;
+ while (*p)
+ STPUTC(*p++, new);
+ if (p[-1] == '/')
+ STUNPUTC(new);
+ }
+ while ((p = getcomponent()) != NULL) {
+ if (equal(p, "..")) {
+ while (new > stackblock() && (STUNPUTC(new), *new) != '/');
+ } else if (*p != '\0' && ! equal(p, ".")) {
+ STPUTC('/', new);
+ while (*p)
+ STPUTC(*p++, new);
+ }
+ }
+ if (new == stackblock())
+ STPUTC('/', new);
+ STACKSTRNUL(new);
+ setpwd(stackblock(), 1);
+}
+
+
+
+static int
+pwdcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ out1fmt(snlfmt, curdir);
+ return 0;
+}
+
+
+
+
+#define MAXPWD 256
+
+/*
+ * Find out what the current directory is. If we already know the current
+ * directory, this routine returns immediately.
+ */
+static void
+getpwd()
+{
+ char buf[MAXPWD];
+
+ /*
+ * Things are a bit complicated here; we could have just used
+ * getcwd, but traditionally getcwd is implemented using popen
+ * to /bin/pwd. This creates a problem for us, since we cannot
+ * keep track of the job if it is being ran behind our backs.
+ * So we re-implement getcwd(), and we suppress interrupts
+ * throughout the process. This is not completely safe, since
+ * the user can still break out of it by killing the pwd program.
+ * We still try to use getcwd for systems that we know have a
+ * c implementation of getcwd, that does not open a pipe to
+ * /bin/pwd.
+ */
+#if defined(__NetBSD__) || defined(__SVR4) || defined(__GLIBC__)
+
+ if (getcwd(buf, sizeof(buf)) == NULL) {
+ char *pwd = getenv("PWD");
+ struct stat stdot, stpwd;
+
+ if (pwd && *pwd == '/' && stat(".", &stdot) != -1 &&
+ stat(pwd, &stpwd) != -1 &&
+ stdot.st_dev == stpwd.st_dev &&
+ stdot.st_ino == stpwd.st_ino) {
+ curdir = savestr(pwd);
+ return;
+ }
+ error("getcwd() failed: %s", strerror(errno));
+ }
+ curdir = savestr(buf);
+#else
+ {
+ char *p;
+ int i;
+ int status;
+ struct job *jp;
+ int pip[2];
+
+ if (pipe(pip) < 0)
+ error("Pipe call failed");
+ jp = makejob((union node *)NULL, 1);
+ if (forkshell(jp, (union node *)NULL, FORK_NOJOB) == 0) {
+ (void) close(pip[0]);
+ if (pip[1] != 1) {
+ close(1);
+ dup_as_newfd(pip[1], 1);
+ close(pip[1]);
+ }
+ (void) execl("/bin/pwd", "pwd", (char *)0);
+ error("Cannot exec /bin/pwd");
+ }
+ (void) close(pip[1]);
+ pip[1] = -1;
+ p = buf;
+ while ((i = read(pip[0], p, buf + MAXPWD - p)) > 0
+ || (i == -1 && errno == EINTR)) {
+ if (i > 0)
+ p += i;
+ }
+ (void) close(pip[0]);
+ pip[0] = -1;
+ status = waitforjob(jp);
+ if (status != 0)
+ error((char *)0);
+ if (i < 0 || p == buf || p[-1] != '\n')
+ error("pwd command failed");
+ p[-1] = '\0';
+ }
+ curdir = savestr(buf);
+#endif
+}
+
+static void
+setpwd(const char *val, int setold)
+{
+ if (setold) {
+ setvar("OLDPWD", curdir, VEXPORT);
+ }
+ INTOFF;
+ if (curdir != nullstr) {
+ free(curdir);
+ curdir = nullstr;
+ }
+ if (!val) {
+ getpwd();
+ } else {
+ curdir = savestr(val);
+ }
+ INTON;
+ setvar("PWD", curdir, VEXPORT);
+}
+
+/* $NetBSD: error.c,v 1.23 2000/07/03 03:26:19 matt Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Errors and exceptions.
+ */
+
+/*
+ * Code to handle exceptions in C.
+ */
+
+struct jmploc *handler;
+static int exception;
+volatile int suppressint;
+volatile int intpending;
+
+
+static void exverror __P((int, const char *, va_list))
+ __attribute__((__noreturn__));
+
+/*
+ * Called to raise an exception. Since C doesn't include exceptions, we
+ * just do a longjmp to the exception handler. The type of exception is
+ * stored in the global variable "exception".
+ */
+
+static void
+exraise(e)
+ int e;
+{
+#ifdef DEBUG
+ if (handler == NULL)
+ abort();
+#endif
+ exception = e;
+ longjmp(handler->loc, 1);
+}
+
+
+/*
+ * Called from trap.c when a SIGINT is received. (If the user specifies
+ * that SIGINT is to be trapped or ignored using the trap builtin, then
+ * this routine is not called.) Suppressint is nonzero when interrupts
+ * are held using the INTOFF macro. The call to _exit is necessary because
+ * there is a short period after a fork before the signal handlers are
+ * set to the appropriate value for the child. (The test for iflag is
+ * just defensive programming.)
+ */
+
+static void
+onint() {
+ sigset_t mysigset;
+
+ if (suppressint) {
+ intpending++;
+ return;
+ }
+ intpending = 0;
+ sigemptyset(&mysigset);
+ sigprocmask(SIG_SETMASK, &mysigset, NULL);
+ if (rootshell && iflag)
+ exraise(EXINT);
+ else {
+ signal(SIGINT, SIG_DFL);
+ raise(SIGINT);
+ }
+ /* NOTREACHED */
+}
+
+
+/*
+ * Exverror is called to raise the error exception. If the first argument
+ * is not NULL then error prints an error message using printf style
+ * formatting. It then raises the error exception.
+ */
+static void
+exverror(cond, msg, ap)
+ int cond;
+ const char *msg;
+ va_list ap;
+{
+ CLEAR_PENDING_INT;
+ INTOFF;
+
+#ifdef DEBUG
+ if (msg)
+ TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
+ else
+ TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
+#endif
+ if (msg) {
+ if (commandname)
+ outfmt(&errout, "%s: ", commandname);
+ doformat(&errout, msg, ap);
+#if FLUSHERR
+ outc('\n', &errout);
+#else
+ outcslow('\n', &errout);
+#endif
+ }
+ flushall();
+ exraise(cond);
+ /* NOTREACHED */
+}
+
+
+#ifdef __STDC__
+static void
+error(const char *msg, ...)
+#else
+static void
+error(va_alist)
+ va_dcl
+#endif
+{
+#ifndef __STDC__
+ const char *msg;
+#endif
+ va_list ap;
+#ifdef __STDC__
+ va_start(ap, msg);
+#else
+ va_start(ap);
+ msg = va_arg(ap, const char *);
+#endif
+ exverror(EXERROR, msg, ap);
+ /* NOTREACHED */
+ va_end(ap);
+}
+
+
+#ifdef __STDC__
+static void
+exerror(int cond, const char *msg, ...)
+#else
+static void
+exerror(va_alist)
+ va_dcl
+#endif
+{
+#ifndef __STDC__
+ int cond;
+ const char *msg;
+#endif
+ va_list ap;
+#ifdef __STDC__
+ va_start(ap, msg);
+#else
+ va_start(ap);
+ cond = va_arg(ap, int);
+ msg = va_arg(ap, const char *);
+#endif
+ exverror(cond, msg, ap);
+ /* NOTREACHED */
+ va_end(ap);
+}
+
+
+
+/*
+ * Table of error messages.
+ */
+
+struct errname {
+ short errcode; /* error number */
+ short action; /* operation which encountered the error */
+ const char *msg; /* text describing the error */
+};
+
+
+#define ALL (E_OPEN|E_CREAT|E_EXEC)
+
+static const struct errname errormsg[] = {
+ { EINTR, ALL, "interrupted" },
+ { EACCES, ALL, "permission denied" },
+ { EIO, ALL, "I/O error" },
+ { ENOENT, E_OPEN, "no such file" },
+ { ENOENT, E_CREAT,"directory nonexistent" },
+ { ENOENT, E_EXEC, "not found" },
+ { ENOTDIR, E_OPEN, "no such file" },
+ { ENOTDIR, E_CREAT,"directory nonexistent" },
+ { ENOTDIR, E_EXEC, "not found" },
+ { EISDIR, ALL, "is a directory" },
+ { EEXIST, E_CREAT,"file exists" },
+#ifdef notdef
+ { EMFILE, ALL, "too many open files" },
+#endif
+ { ENFILE, ALL, "file table overflow" },
+ { ENOSPC, ALL, "file system full" },
+#ifdef EDQUOT
+ { EDQUOT, ALL, "disk quota exceeded" },
+#endif
+#ifdef ENOSR
+ { ENOSR, ALL, "no streams resources" },
+#endif
+ { ENXIO, ALL, "no such device or address" },
+ { EROFS, ALL, "read-only file system" },
+ { ETXTBSY, ALL, "text busy" },
+#ifdef SYSV
+ { EAGAIN, E_EXEC, "not enough memory" },
+#endif
+ { ENOMEM, ALL, "not enough memory" },
+#ifdef ENOLINK
+ { ENOLINK, ALL, "remote access failed" },
+#endif
+#ifdef EMULTIHOP
+ { EMULTIHOP, ALL, "remote access failed" },
+#endif
+#ifdef ECOMM
+ { ECOMM, ALL, "remote access failed" },
+#endif
+#ifdef ESTALE
+ { ESTALE, ALL, "remote access failed" },
+#endif
+#ifdef ETIMEDOUT
+ { ETIMEDOUT, ALL, "remote access failed" },
+#endif
+#ifdef ELOOP
+ { ELOOP, ALL, "symbolic link loop" },
+#endif
+ { E2BIG, E_EXEC, "argument list too long" },
+#ifdef ELIBACC
+ { ELIBACC, E_EXEC, "shared library missing" },
+#endif
+ { 0, 0, NULL },
+};
+
+
+/*
+ * Return a string describing an error. The returned string may be a
+ * pointer to a static buffer that will be overwritten on the next call.
+ * Action describes the operation that got the error.
+ */
+
+static const char *
+errmsg(e, action)
+ int e;
+ int action;
+{
+ struct errname const *ep;
+ static char buf[12];
+
+ for (ep = errormsg ; ep->errcode ; ep++) {
+ if (ep->errcode == e && (ep->action & action) != 0)
+ return ep->msg;
+ }
+ fmtstr(buf, sizeof buf, "error %d", e);
+ return buf;
+}
+
+
+#ifdef REALLY_SMALL
+static void
+__inton() {
+ if (--suppressint == 0 && intpending) {
+ onint();
+ }
+}
+#endif
+/* $NetBSD: eval.c,v 1.57 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+/* flags in argument to evaltree */
+#define EV_EXIT 01 /* exit after evaluating tree */
+#define EV_TESTED 02 /* exit status is checked; ignore -e flag */
+#define EV_BACKCMD 04 /* command executing within back quotes */
+
+static int evalskip; /* set if we are skipping commands */
+static int skipcount; /* number of levels to skip */
+static int loopnest; /* current loop nesting level */
+static int funcnest; /* depth of function calls */
+
+
+static char *commandname;
+struct strlist *cmdenviron;
+static int exitstatus; /* exit status of last command */
+static int oexitstatus; /* saved exit status */
+
+
+static void evalloop __P((union node *, int));
+static void evalfor __P((union node *, int));
+static void evalcase __P((union node *, int));
+static void evalsubshell __P((union node *, int));
+static void expredir __P((union node *));
+static void evalpipe __P((union node *));
+#ifdef notyet
+static void evalcommand __P((union node *, int, struct backcmd *));
+#else
+static void evalcommand __P((union node *, int));
+#endif
+static void prehash __P((union node *));
+static void eprintlist __P((struct strlist *));
+
+
+/*
+ * Called to reset things after an exception.
+ */
+
+#ifdef mkinit
+INCLUDE "eval.h"
+
+RESET {
+ evalskip = 0;
+ loopnest = 0;
+ funcnest = 0;
+}
+
+SHELLPROC {
+ exitstatus = 0;
+}
+#endif
+
+
+
+/*
+ * The eval commmand.
+ */
+
+static int
+evalcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char *p;
+ char *concat;
+ char **ap;
+
+ if (argc > 1) {
+ p = argv[1];
+ if (argc > 2) {
+ STARTSTACKSTR(concat);
+ ap = argv + 2;
+ for (;;) {
+ while (*p)
+ STPUTC(*p++, concat);
+ if ((p = *ap++) == NULL)
+ break;
+ STPUTC(' ', concat);
+ }
+ STPUTC('\0', concat);
+ p = grabstackstr(concat);
+ }
+ evalstring(p, EV_TESTED);
+ }
+ return exitstatus;
+}
+
+
+/*
+ * Execute a command or commands contained in a string.
+ */
+
+static void
+evalstring(s, flag)
+ char *s;
+ int flag;
+ {
+ union node *n;
+ struct stackmark smark;
+
+ setstackmark(&smark);
+ setinputstring(s);
+ while ((n = parsecmd(0)) != NEOF) {
+ evaltree(n, flag);
+ popstackmark(&smark);
+ }
+ popfile();
+ popstackmark(&smark);
+}
+
+
+
+/*
+ * Evaluate a parse tree. The value is left in the global variable
+ * exitstatus.
+ */
+
+static void
+evaltree(n, flags)
+ union node *n;
+ int flags;
+{
+ int checkexit = 0;
+ if (n == NULL) {
+ TRACE(("evaltree(NULL) called\n"));
+ goto out;
+ }
+ TRACE(("evaltree(0x%lx: %d) called\n", (long)n, n->type));
+ switch (n->type) {
+ case NSEMI:
+ evaltree(n->nbinary.ch1, flags & EV_TESTED);
+ if (evalskip)
+ goto out;
+ evaltree(n->nbinary.ch2, flags);
+ break;
+ case NAND:
+ evaltree(n->nbinary.ch1, EV_TESTED);
+ if (evalskip || exitstatus != 0)
+ goto out;
+ evaltree(n->nbinary.ch2, flags);
+ break;
+ case NOR:
+ evaltree(n->nbinary.ch1, EV_TESTED);
+ if (evalskip || exitstatus == 0)
+ goto out;
+ evaltree(n->nbinary.ch2, flags);
+ break;
+ case NREDIR:
+ expredir(n->nredir.redirect);
+ redirect(n->nredir.redirect, REDIR_PUSH);
+ evaltree(n->nredir.n, flags);
+ popredir();
+ break;
+ case NSUBSHELL:
+ evalsubshell(n, flags);
+ break;
+ case NBACKGND:
+ evalsubshell(n, flags);
+ break;
+ case NIF: {
+ evaltree(n->nif.test, EV_TESTED);
+ if (evalskip)
+ goto out;
+ if (exitstatus == 0)
+ evaltree(n->nif.ifpart, flags);
+ else if (n->nif.elsepart)
+ evaltree(n->nif.elsepart, flags);
+ else
+ exitstatus = 0;
+ break;
+ }
+ case NWHILE:
+ case NUNTIL:
+ evalloop(n, flags);
+ break;
+ case NFOR:
+ evalfor(n, flags);
+ break;
+ case NCASE:
+ evalcase(n, flags);
+ break;
+ case NDEFUN: {
+ struct builtincmd *bcmd;
+ if (
+ (bcmd = find_builtin(n->narg.text)) &&
+ bcmd->flags & BUILTIN_SPECIAL
+ ) {
+ outfmt(out2, "%s is a special built-in\n", n->narg.text);
+ exitstatus = 1;
+ break;
+ }
+ defun(n->narg.text, n->narg.next);
+ exitstatus = 0;
+ break;
+ }
+ case NNOT:
+ evaltree(n->nnot.com, EV_TESTED);
+ exitstatus = !exitstatus;
+ break;
+
+ case NPIPE:
+ evalpipe(n);
+ checkexit = 1;
+ break;
+ case NCMD:
+#ifdef notyet
+ evalcommand(n, flags, (struct backcmd *)NULL);
+#else
+ evalcommand(n, flags);
+#endif
+ checkexit = 1;
+ break;
+#ifdef DEBUG
+ default:
+ out1fmt("Node type = %d\n", n->type);
+#ifndef USE_GLIBC_STDIO
+ flushout(out1);
+#endif
+ break;
+#endif
+ }
+out:
+ if (pendingsigs)
+ dotrap();
+ if (
+ flags & EV_EXIT ||
+ (checkexit && eflag && exitstatus && !(flags & EV_TESTED))
+ )
+ exitshell(exitstatus);
+}
+
+
+static void
+evalloop(n, flags)
+ union node *n;
+ int flags;
+{
+ int status;
+
+ loopnest++;
+ status = 0;
+ for (;;) {
+ evaltree(n->nbinary.ch1, EV_TESTED);
+ if (evalskip) {
+skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
+ evalskip = 0;
+ continue;
+ }
+ if (evalskip == SKIPBREAK && --skipcount <= 0)
+ evalskip = 0;
+ break;
+ }
+ if (n->type == NWHILE) {
+ if (exitstatus != 0)
+ break;
+ } else {
+ if (exitstatus == 0)
+ break;
+ }
+ evaltree(n->nbinary.ch2, flags & EV_TESTED);
+ status = exitstatus;
+ if (evalskip)
+ goto skipping;
+ }
+ loopnest--;
+ exitstatus = status;
+}
+
+
+
+static void
+evalfor(n, flags)
+ union node *n;
+ int flags;
+{
+ struct arglist arglist;
+ union node *argp;
+ struct strlist *sp;
+ struct stackmark smark;
+
+ setstackmark(&smark);
+ arglist.lastp = &arglist.list;
+ for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
+ oexitstatus = exitstatus;
+ expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
+ if (evalskip)
+ goto out;
+ }
+ *arglist.lastp = NULL;
+
+ exitstatus = 0;
+ loopnest++;
+ for (sp = arglist.list ; sp ; sp = sp->next) {
+ setvar(n->nfor.var, sp->text, 0);
+ evaltree(n->nfor.body, flags & EV_TESTED);
+ if (evalskip) {
+ if (evalskip == SKIPCONT && --skipcount <= 0) {
+ evalskip = 0;
+ continue;
+ }
+ if (evalskip == SKIPBREAK && --skipcount <= 0)
+ evalskip = 0;
+ break;
+ }
+ }
+ loopnest--;
+out:
+ popstackmark(&smark);
+}
+
+
+
+static void
+evalcase(n, flags)
+ union node *n;
+ int flags;
+{
+ union node *cp;
+ union node *patp;
+ struct arglist arglist;
+ struct stackmark smark;
+
+ setstackmark(&smark);
+ arglist.lastp = &arglist.list;
+ oexitstatus = exitstatus;
+ expandarg(n->ncase.expr, &arglist, EXP_TILDE);
+ for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
+ for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {
+ if (casematch(patp, arglist.list->text)) {
+ if (evalskip == 0) {
+ evaltree(cp->nclist.body, flags);
+ }
+ goto out;
+ }
+ }
+ }
+out:
+ popstackmark(&smark);
+}
+
+
+
+/*
+ * Kick off a subshell to evaluate a tree.
+ */
+
+static void
+evalsubshell(n, flags)
+ union node *n;
+ int flags;
+{
+ struct job *jp;
+ int backgnd = (n->type == NBACKGND);
+
+ expredir(n->nredir.redirect);
+ jp = makejob(n, 1);
+ if (forkshell(jp, n, backgnd) == 0) {
+ if (backgnd)
+ flags &=~ EV_TESTED;
+ redirect(n->nredir.redirect, 0);
+ evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */
+ }
+ if (! backgnd) {
+ INTOFF;
+ exitstatus = waitforjob(jp);
+ INTON;
+ }
+}
+
+
+
+/*
+ * Compute the names of the files in a redirection list.
+ */
+
+static void
+expredir(n)
+ union node *n;
+{
+ union node *redir;
+
+ for (redir = n ; redir ; redir = redir->nfile.next) {
+ struct arglist fn;
+ fn.lastp = &fn.list;
+ oexitstatus = exitstatus;
+ switch (redir->type) {
+ case NFROMTO:
+ case NFROM:
+ case NTO:
+ case NAPPEND:
+ case NTOOV:
+ expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
+ redir->nfile.expfname = fn.list->text;
+ break;
+ case NFROMFD:
+ case NTOFD:
+ if (redir->ndup.vname) {
+ expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
+ fixredir(redir, fn.list->text, 1);
+ }
+ break;
+ }
+ }
+}
+
+
+
+/*
+ * Evaluate a pipeline. All the processes in the pipeline are children
+ * of the process creating the pipeline. (This differs from some versions
+ * of the shell, which make the last process in a pipeline the parent
+ * of all the rest.)
+ */
+
+static void
+evalpipe(n)
+ union node *n;
+{
+ struct job *jp;
+ struct nodelist *lp;
+ int pipelen;
+ int prevfd;
+ int pip[2];
+
+ TRACE(("evalpipe(0x%lx) called\n", (long)n));
+ pipelen = 0;
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
+ pipelen++;
+ INTOFF;
+ jp = makejob(n, pipelen);
+ prevfd = -1;
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
+ prehash(lp->n);
+ pip[1] = -1;
+ if (lp->next) {
+ if (pipe(pip) < 0) {
+ close(prevfd);
+ error("Pipe call failed");
+ }
+ }
+ if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
+ INTON;
+ if (prevfd > 0) {
+ close(0);
+ dup_as_newfd(prevfd, 0);
+ close(prevfd);
+ if (pip[0] == 0) {
+ pip[0] = -1;
+ }
+ }
+ if (pip[1] >= 0) {
+ if (pip[0] >= 0) {
+ close(pip[0]);
+ }
+ if (pip[1] != 1) {
+ close(1);
+ dup_as_newfd(pip[1], 1);
+ close(pip[1]);
+ }
+ }
+ evaltree(lp->n, EV_EXIT);
+ }
+ if (prevfd >= 0)
+ close(prevfd);
+ prevfd = pip[0];
+ close(pip[1]);
+ }
+ INTON;
+ if (n->npipe.backgnd == 0) {
+ INTOFF;
+ exitstatus = waitforjob(jp);
+ TRACE(("evalpipe: job done exit status %d\n", exitstatus));
+ INTON;
+ }
+}
+
+
+
+/*
+ * Execute a command inside back quotes. If it's a builtin command, we
+ * want to save its output in a block obtained from malloc. Otherwise
+ * we fork off a subprocess and get the output of the command via a pipe.
+ * Should be called with interrupts off.
+ */
+
+static void
+evalbackcmd(n, result)
+ union node *n;
+ struct backcmd *result;
+{
+ int pip[2];
+ struct job *jp;
+ struct stackmark smark; /* unnecessary */
+
+ setstackmark(&smark);
+ result->fd = -1;
+ result->buf = NULL;
+ result->nleft = 0;
+ result->jp = NULL;
+ if (n == NULL) {
+ exitstatus = 0;
+ goto out;
+ }
+#ifdef notyet
+ /*
+ * For now we disable executing builtins in the same
+ * context as the shell, because we are not keeping
+ * enough state to recover from changes that are
+ * supposed only to affect subshells. eg. echo "`cd /`"
+ */
+ if (n->type == NCMD) {
+ exitstatus = oexitstatus;
+ evalcommand(n, EV_BACKCMD, result);
+ } else
+#endif
+ {
+ exitstatus = 0;
+ if (pipe(pip) < 0)
+ error("Pipe call failed");
+ jp = makejob(n, 1);
+ if (forkshell(jp, n, FORK_NOJOB) == 0) {
+ FORCEINTON;
+ close(pip[0]);
+ if (pip[1] != 1) {
+ close(1);
+ dup_as_newfd(pip[1], 1);
+ close(pip[1]);
+ }
+ eflag = 0;
+ evaltree(n, EV_EXIT);
+ }
+ close(pip[1]);
+ result->fd = pip[0];
+ result->jp = jp;
+ }
+out:
+ popstackmark(&smark);
+ TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
+ result->fd, result->buf, result->nleft, result->jp));
+}
+
+
+
+/*
+ * Execute a simple command.
+ */
+
+static void
+#ifdef notyet
+evalcommand(cmd, flags, backcmd)
+ union node *cmd;
+ int flags;
+ struct backcmd *backcmd;
+#else
+evalcommand(cmd, flags)
+ union node *cmd;
+ int flags;
+#endif
+{
+ struct stackmark smark;
+ union node *argp;
+ struct arglist arglist;
+ struct arglist varlist;
+ char **argv;
+ int argc;
+ char **envp;
+ struct strlist *sp;
+ int mode;
+#ifdef notyet
+ int pip[2];
+#endif
+ struct cmdentry cmdentry;
+ struct job *jp;
+ char *volatile savecmdname;
+ volatile struct shparam saveparam;
+ struct localvar *volatile savelocalvars;
+ volatile int e;
+ char *lastarg;
+ const char *path;
+ const struct builtincmd *firstbltin;
+ struct jmploc *volatile savehandler;
+ struct jmploc jmploc;
+#if __GNUC__
+ /* Avoid longjmp clobbering */
+ (void) &argv;
+ (void) &argc;
+ (void) &lastarg;
+ (void) &flags;
+#endif
+
+ /* First expand the arguments. */
+ TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
+ setstackmark(&smark);
+ arglist.lastp = &arglist.list;
+ varlist.lastp = &varlist.list;
+ arglist.list = 0;
+ oexitstatus = exitstatus;
+ exitstatus = 0;
+ path = pathval();
+ for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
+ expandarg(argp, &varlist, EXP_VARTILDE);
+ }
+ for (
+ argp = cmd->ncmd.args; argp && !arglist.list;
+ argp = argp->narg.next
+ ) {
+ expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
+ }
+ if (argp) {
+ struct builtincmd *bcmd;
+ bool pseudovarflag;
+ bcmd = find_builtin(arglist.list->text);
+ pseudovarflag = bcmd && bcmd->flags & BUILTIN_ASSIGN;
+ for (; argp; argp = argp->narg.next) {
+ if (pseudovarflag && isassignment(argp->narg.text)) {
+ expandarg(argp, &arglist, EXP_VARTILDE);
+ continue;
+ }
+ expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
+ }
+ }
+ *arglist.lastp = NULL;
+ *varlist.lastp = NULL;
+ expredir(cmd->ncmd.redirect);
+ argc = 0;
+ for (sp = arglist.list ; sp ; sp = sp->next)
+ argc++;
+ argv = stalloc(sizeof (char *) * (argc + 1));
+
+ for (sp = arglist.list ; sp ; sp = sp->next) {
+ TRACE(("evalcommand arg: %s\n", sp->text));
+ *argv++ = sp->text;
+ }
+ *argv = NULL;
+ lastarg = NULL;
+ if (iflag && funcnest == 0 && argc > 0)
+ lastarg = argv[-1];
+ argv -= argc;
+
+ /* Print the command if xflag is set. */
+ if (xflag) {
+#ifdef FLUSHERR
+ outc('+', &errout);
+#else
+ outcslow('+', &errout);
+#endif
+ eprintlist(varlist.list);
+ eprintlist(arglist.list);
+#ifdef FLUSHERR
+ outc('\n', &errout);
+ flushout(&errout);
+#else
+ outcslow('\n', &errout);
+#endif
+ }
+
+ /* Now locate the command. */
+ if (argc == 0) {
+ cmdentry.cmdtype = CMDBUILTIN;
+ firstbltin = cmdentry.u.cmd = BLTINCMD;
+ } else {
+ const char *oldpath;
+ int findflag = DO_ERR;
+ int oldfindflag;
+
+ /*
+ * Modify the command lookup path, if a PATH= assignment
+ * is present
+ */
+ for (sp = varlist.list ; sp ; sp = sp->next)
+ if (varequal(sp->text, defpathvar)) {
+ path = sp->text + 5;
+ findflag |= DO_BRUTE;
+ }
+ oldpath = path;
+ oldfindflag = findflag;
+ firstbltin = 0;
+ for(;;) {
+ find_command(argv[0], &cmdentry, findflag, path);
+ if (cmdentry.cmdtype == CMDUNKNOWN) { /* command not found */
+ exitstatus = 127;
+#ifdef FLUSHERR
+ flushout(&errout);
+#endif
+ goto out;
+ }
+ /* implement bltin and command here */
+ if (cmdentry.cmdtype != CMDBUILTIN) {
+ break;
+ }
+ if (!firstbltin) {
+ firstbltin = cmdentry.u.cmd;
+ }
+ if (cmdentry.u.cmd == BLTINCMD) {
+ for(;;) {
+ struct builtincmd *bcmd;
+
+ argv++;
+ if (--argc == 0)
+ goto found;
+ if (!(bcmd = find_builtin(*argv))) {
+ outfmt(&errout, "%s: not found\n", *argv);
+ exitstatus = 127;
+#ifdef FLUSHERR
+ flushout(&errout);
+#endif
+ goto out;
+ }
+ cmdentry.u.cmd = bcmd;
+ if (bcmd != BLTINCMD)
+ break;
+ }
+ }
+ if (cmdentry.u.cmd == COMMANDCMD) {
+ argv++;
+ if (--argc == 0) {
+ goto found;
+ }
+ if (*argv[0] == '-') {
+ if (!equal(argv[0], "-p")) {
+ argv--;
+ argc++;
+ break;
+ }
+ argv++;
+ if (--argc == 0) {
+ goto found;
+ }
+ path = defpath;
+ findflag |= DO_BRUTE;
+ } else {
+ path = oldpath;
+ findflag = oldfindflag;
+ }
+ findflag |= DO_NOFUN;
+ continue;
+ }
+found:
+ break;
+ }
+ }
+
+ /* Fork off a child process if necessary. */
+ if (cmd->ncmd.backgnd
+ || (cmdentry.cmdtype == CMDNORMAL && (flags & EV_EXIT) == 0)
+#ifdef notyet
+ || ((flags & EV_BACKCMD) != 0
+ && (cmdentry.cmdtype != CMDBUILTIN
+ || cmdentry.u.bcmd == DOTCMD
+ || cmdentry.u.bcmd == EVALCMD))
+#endif
+ ) {
+ jp = makejob(cmd, 1);
+ mode = cmd->ncmd.backgnd;
+#ifdef notyet
+ if (flags & EV_BACKCMD) {
+ mode = FORK_NOJOB;
+ if (pipe(pip) < 0)
+ error("Pipe call failed");
+ }
+#endif
+ if (forkshell(jp, cmd, mode) != 0)
+ goto parent; /* at end of routine */
+#ifdef notyet
+ if (flags & EV_BACKCMD) {
+ FORCEINTON;
+ close(pip[0]);
+ if (pip[1] != 1) {
+ close(1);
+ dup_as_newfd(pip[1], 1);
+ close(pip[1]);
+ }
+ }
+#endif
+ flags |= EV_EXIT;
+ }
+
+ /* This is the child process if a fork occurred. */
+ /* Execute the command. */
+ if (cmdentry.cmdtype == CMDFUNCTION) {
+#ifdef DEBUG
+ trputs("Shell function: "); trargs(argv);
+#endif
+ exitstatus = oexitstatus;
+ redirect(cmd->ncmd.redirect, REDIR_PUSH);
+ saveparam = shellparam;
+ shellparam.malloc = 0;
+ shellparam.nparam = argc - 1;
+ shellparam.p = argv + 1;
+ INTOFF;
+ savelocalvars = localvars;
+ localvars = NULL;
+ INTON;
+ if (setjmp(jmploc.loc)) {
+ if (exception == EXSHELLPROC) {
+ freeparam((volatile struct shparam *)
+ &saveparam);
+ } else {
+ saveparam.optind = shellparam.optind;
+ saveparam.optoff = shellparam.optoff;
+ freeparam(&shellparam);
+ shellparam = saveparam;
+ }
+ poplocalvars();
+ localvars = savelocalvars;
+ handler = savehandler;
+ longjmp(handler->loc, 1);
+ }
+ savehandler = handler;
+ handler = &jmploc;
+ for (sp = varlist.list ; sp ; sp = sp->next)
+ mklocal(sp->text);
+ funcnest++;
+ evaltree(cmdentry.u.func, flags & EV_TESTED);
+ funcnest--;
+ INTOFF;
+ poplocalvars();
+ localvars = savelocalvars;
+ saveparam.optind = shellparam.optind;
+ saveparam.optoff = shellparam.optoff;
+ freeparam(&shellparam);
+ shellparam = saveparam;
+ handler = savehandler;
+ popredir();
+ INTON;
+ if (evalskip == SKIPFUNC) {
+ evalskip = 0;
+ skipcount = 0;
+ }
+ if (flags & EV_EXIT)
+ exitshell(exitstatus);
+ } else if (cmdentry.cmdtype == CMDBUILTIN) {
+#ifdef DEBUG
+ trputs("builtin command: "); trargs(argv);
+#endif
+ mode = (cmdentry.u.cmd == EXECCMD)? 0 : REDIR_PUSH;
+#ifdef notyet
+ if (flags == EV_BACKCMD) {
+#ifdef USE_GLIBC_STDIO
+ openmemout();
+#else
+ memout.nleft = 0;
+ memout.nextc = memout.buf;
+ memout.bufsize = 64;
+#endif
+ mode |= REDIR_BACKQ;
+ }
+#endif
+ redirect(cmd->ncmd.redirect, mode);
+ savecmdname = commandname;
+ if (firstbltin->flags & BUILTIN_SPECIAL) {
+ listsetvar(varlist.list);
+ } else {
+ cmdenviron = varlist.list;
+ }
+ e = -1;
+ if (setjmp(jmploc.loc)) {
+ e = exception;
+ exitstatus = (e == EXINT)? SIGINT+128 : 2;
+ goto cmddone;
+ }
+ savehandler = handler;
+ handler = &jmploc;
+ commandname = argv[0];
+ argptr = argv + 1;
+ optptr = NULL; /* initialize nextopt */
+ exitstatus = (*cmdentry.u.cmd->builtinfunc)(argc, argv);
+ flushall();
+cmddone:
+ exitstatus |= outerr(out1);
+ out1 = &output;
+ out2 = &errout;
+ freestdout();
+ cmdenviron = NULL;
+ if (e != EXSHELLPROC) {
+ commandname = savecmdname;
+ if (flags & EV_EXIT)
+ exitshell(exitstatus);
+ }
+ handler = savehandler;
+ if (e != -1) {
+ if ((e != EXERROR && e != EXEXEC)
+ || cmdentry.u.cmd == BLTINCMD
+ || cmdentry.u.cmd == DOTCMD
+ || cmdentry.u.cmd == EVALCMD
+ || cmdentry.u.cmd == EXECCMD)
+ exraise(e);
+ FORCEINTON;
+ }
+ if (cmdentry.u.cmd != EXECCMD)
+ popredir();
+#ifdef notyet
+ if (flags == EV_BACKCMD) {
+ INTOFF;
+#ifdef USE_GLIBC_STDIO
+ if (__closememout()) {
+ error(
+ "__closememout() failed: %s",
+ strerror(errno)
+ );
+ }
+#endif
+ backcmd->buf = memout.buf;
+#ifdef USE_GLIBC_STDIO
+ backcmd->nleft = memout.bufsize;
+#else
+ backcmd->nleft = memout.nextc - memout.buf;
+#endif
+ memout.buf = NULL;
+ INTON;
+ }
+#endif
+ } else {
+#ifdef DEBUG
+ trputs("normal command: "); trargs(argv);
+#endif
+ redirect(cmd->ncmd.redirect, 0);
+ clearredir();
+ for (sp = varlist.list ; sp ; sp = sp->next)
+ setvareq(sp->text, VEXPORT|VSTACK);
+ envp = environment();
+ shellexec(argv, envp, path, cmdentry.u.index);
+ }
+ goto out;
+
+parent: /* parent process gets here (if we forked) */
+ if (mode == 0) { /* argument to fork */
+ INTOFF;
+ exitstatus = waitforjob(jp);
+ INTON;
+#ifdef notyet
+ } else if (mode == 2) {
+ backcmd->fd = pip[0];
+ close(pip[1]);
+ backcmd->jp = jp;
+#endif
+ }
+
+out:
+ if (lastarg)
+ setvar("_", lastarg, 0);
+ popstackmark(&smark);
+}
+
+
+
+/*
+ * Search for a command. This is called before we fork so that the
+ * location of the command will be available in the parent as well as
+ * the child. The check for "goodname" is an overly conservative
+ * check that the name will not be subject to expansion.
+ */
+
+static void
+prehash(n)
+ union node *n;
+{
+ struct cmdentry entry;
+
+ if (n->type == NCMD && n->ncmd.args)
+ if (goodname(n->ncmd.args->narg.text))
+ find_command(n->ncmd.args->narg.text, &entry, 0,
+ pathval());
+}
+
+
+
+/*
+ * Builtin commands. Builtin commands whose functions are closely
+ * tied to evaluation are implemented here.
+ */
+
+/*
+ * No command given, or a bltin command with no arguments. Set the
+ * specified variables.
+ */
+
+int
+bltincmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ /*
+ * Preserve exitstatus of a previous possible redirection
+ * as POSIX mandates
+ */
+ return exitstatus;
+}
+
+
+/*
+ * Handle break and continue commands. Break, continue, and return are
+ * all handled by setting the evalskip flag. The evaluation routines
+ * above all check this flag, and if it is set they start skipping
+ * commands rather than executing them. The variable skipcount is
+ * the number of loops to break/continue, or the number of function
+ * levels to return. (The latter is always 1.) It should probably
+ * be an error to break out of more loops than exist, but it isn't
+ * in the standard shell so we don't make it one here.
+ */
+
+static int
+breakcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int n = argc > 1 ? number(argv[1]) : 1;
+
+ if (n > loopnest)
+ n = loopnest;
+ if (n > 0) {
+ evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
+ skipcount = n;
+ }
+ return 0;
+}
+
+
+/*
+ * The return command.
+ */
+
+static int
+returncmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int ret = argc > 1 ? number(argv[1]) : oexitstatus;
+
+ if (funcnest) {
+ evalskip = SKIPFUNC;
+ skipcount = 1;
+ return ret;
+ }
+ else {
+ /* Do what ksh does; skip the rest of the file */
+ evalskip = SKIPFILE;
+ skipcount = 1;
+ return ret;
+ }
+}
+
+
+#ifndef BB_TRUE_FALSE
+static int
+false_main(argc, argv)
+ int argc;
+ char **argv;
+{
+ return 1;
+}
+
+
+static int
+true_main(argc, argv)
+ int argc;
+ char **argv;
+{
+ return 0;
+}
+#endif
+
+static int
+execcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ if (argc > 1) {
+ struct strlist *sp;
+
+ iflag = 0; /* exit on error */
+ mflag = 0;
+ optschanged();
+ for (sp = cmdenviron; sp ; sp = sp->next)
+ setvareq(sp->text, VEXPORT|VSTACK);
+ shellexec(argv + 1, environment(), pathval(), 0);
+ }
+ return 0;
+}
+
+static void
+eprintlist(struct strlist *sp)
+{
+ for (; sp; sp = sp->next) {
+ outfmt(&errout, " %s",sp->text);
+ }
+}
+/* $NetBSD: exec.c,v 1.32 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * When commands are first encountered, they are entered in a hash table.
+ * This ensures that a full path search will not have to be done for them
+ * on each invocation.
+ *
+ * We should investigate converting to a linear search, even though that
+ * would make the command name "hash" a misnomer.
+ */
+#define CMDTABLESIZE 31 /* should be prime */
+#define ARB 1 /* actual size determined at run time */
+
+
+
+struct tblentry {
+ struct tblentry *next; /* next entry in hash chain */
+ union param param; /* definition of builtin function */
+ short cmdtype; /* index identifying command */
+ char rehash; /* if set, cd done since entry created */
+ char cmdname[ARB]; /* name of command */
+};
+
+
+static struct tblentry *cmdtable[CMDTABLESIZE];
+static int builtinloc = -1; /* index in path of %builtin, or -1 */
+static int exerrno = 0; /* Last exec error */
+
+
+static void tryexec __P((char *, char **, char **));
+#if !defined(BSD) && !defined(linux)
+static void execinterp __P((char **, char **));
+#endif
+static void printentry __P((struct tblentry *, int));
+static void clearcmdentry __P((int));
+static struct tblentry *cmdlookup __P((char *, int));
+static void delete_cmd_entry __P((void));
+#ifdef ASH_TYPE
+static int describe_command __P((char *, int));
+#endif
+static int path_change __P((const char *, int *));
+
+
+/*
+ * Exec a program. Never returns. If you change this routine, you may
+ * have to change the find_command routine as well.
+ */
+
+static void
+shellexec(argv, envp, path, idx)
+ char **argv, **envp;
+ const char *path;
+ int idx;
+{
+ char *cmdname;
+ int e;
+
+ if (strchr(argv[0], '/') != NULL) {
+ tryexec(argv[0], argv, envp);
+ e = errno;
+ } else {
+ e = ENOENT;
+ while ((cmdname = padvance(&path, argv[0])) != NULL) {
+ if (--idx < 0 && pathopt == NULL) {
+ tryexec(cmdname, argv, envp);
+ if (errno != ENOENT && errno != ENOTDIR)
+ e = errno;
+ }
+ stunalloc(cmdname);
+ }
+ }
+
+ /* Map to POSIX errors */
+ switch (e) {
+ case EACCES:
+ exerrno = 126;
+ break;
+ case ENOENT:
+ exerrno = 127;
+ break;
+ default:
+ exerrno = 2;
+ break;
+ }
+ exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
+ /* NOTREACHED */
+}
+
+
+static void
+tryexec(cmd, argv, envp)
+ char *cmd;
+ char **argv;
+ char **envp;
+ {
+ int e;
+#if !defined(BSD) && !defined(linux)
+ char *p;
+#endif
+
+#ifdef SYSV
+ do {
+ execve(cmd, argv, envp);
+ } while (errno == EINTR);
+#else
+ execve(cmd, argv, envp);
+#endif
+ e = errno;
+ if (e == ENOEXEC) {
+ INTOFF;
+ initshellproc();
+ setinputfile(cmd, 0);
+ commandname = arg0 = savestr(argv[0]);
+#if !defined(BSD) && !defined(linux)
+ INTON;
+ pgetc(); pungetc(); /* fill up input buffer */
+ p = parsenextc;
+ if (parsenleft > 2 && p[0] == '#' && p[1] == '!') {
+ argv[0] = cmd;
+ execinterp(argv, envp);
+ }
+ INTOFF;
+#endif
+ setparam(argv + 1);
+ exraise(EXSHELLPROC);
+ }
+ errno = e;
+}
+
+
+#if !defined(BSD) && !defined(linux)
+/*
+ * Execute an interpreter introduced by "#!", for systems where this
+ * feature has not been built into the kernel. If the interpreter is
+ * the shell, return (effectively ignoring the "#!"). If the execution
+ * of the interpreter fails, exit.
+ *
+ * This code peeks inside the input buffer in order to avoid actually
+ * reading any input. It would benefit from a rewrite.
+ */
+
+#define NEWARGS 5
+
+static void
+execinterp(argv, envp)
+ char **argv, **envp;
+ {
+ int n;
+ char *inp;
+ char *outp;
+ char c;
+ char *p;
+ char **ap;
+ char *newargs[NEWARGS];
+ int i;
+ char **ap2;
+ char **new;
+
+ n = parsenleft - 2;
+ inp = parsenextc + 2;
+ ap = newargs;
+ for (;;) {
+ while (--n >= 0 && (*inp == ' ' || *inp == '\t'))
+ inp++;
+ if (n < 0)
+ goto bad;
+ if ((c = *inp++) == '\n')
+ break;
+ if (ap == &newargs[NEWARGS])
+bad: error("Bad #! line");
+ STARTSTACKSTR(outp);
+ do {
+ STPUTC(c, outp);
+ } while (--n >= 0 && (c = *inp++) != ' ' && c != '\t' && c != '\n');
+ STPUTC('\0', outp);
+ n++, inp--;
+ *ap++ = grabstackstr(outp);
+ }
+ if (ap == newargs + 1) { /* if no args, maybe no exec is needed */
+ p = newargs[0];
+ for (;;) {
+ if (equal(p, "sh") || equal(p, "ash")) {
+ return;
+ }
+ while (*p != '/') {
+ if (*p == '\0')
+ goto break2;
+ p++;
+ }
+ p++;
+ }
+break2:;
+ }
+ i = (char *)ap - (char *)newargs; /* size in bytes */
+ if (i == 0)
+ error("Bad #! line");
+ for (ap2 = argv ; *ap2++ != NULL ; );
+ new = ckmalloc(i + ((char *)ap2 - (char *)argv));
+ ap = newargs, ap2 = new;
+ while ((i -= sizeof (char **)) >= 0)
+ *ap2++ = *ap++;
+ ap = argv;
+ while (*ap2++ = *ap++);
+ shellexec(new, envp, pathval(), 0);
+ /* NOTREACHED */
+}
+#endif
+
+
+
+/*
+ * Do a path search. The variable path (passed by reference) should be
+ * set to the start of the path before the first call; padvance will update
+ * this value as it proceeds. Successive calls to padvance will return
+ * the possible path expansions in sequence. If an option (indicated by
+ * a percent sign) appears in the path entry then the global variable
+ * pathopt will be set to point to it; otherwise pathopt will be set to
+ * NULL.
+ */
+
+static const char *pathopt;
+
+static char *
+padvance(path, name)
+ const char **path;
+ const char *name;
+ {
+ const char *p;
+ char *q;
+ const char *start;
+ int len;
+
+ if (*path == NULL)
+ return NULL;
+ start = *path;
+ for (p = start ; *p && *p != ':' && *p != '%' ; p++);
+ len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
+ while (stackblocksize() < len)
+ growstackblock();
+ q = stackblock();
+ if (p != start) {
+ memcpy(q, start, p - start);
+ q += p - start;
+ *q++ = '/';
+ }
+ strcpy(q, name);
+ pathopt = NULL;
+ if (*p == '%') {
+ pathopt = ++p;
+ while (*p && *p != ':') p++;
+ }
+ if (*p == ':')
+ *path = p + 1;
+ else
+ *path = NULL;
+ return stalloc(len);
+}
+
+
+
+/*** Command hashing code ***/
+
+
+static int
+hashcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+ int c;
+ int verbose;
+ struct cmdentry entry;
+ char *name;
+
+ verbose = 0;
+ while ((c = nextopt("rv")) != '\0') {
+ if (c == 'r') {
+ clearcmdentry(0);
+ return 0;
+ } else if (c == 'v') {
+ verbose++;
+ }
+ }
+ if (*argptr == NULL) {
+ for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
+ for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+ if (cmdp->cmdtype != CMDBUILTIN) {
+ printentry(cmdp, verbose);
+ }
+ }
+ }
+ return 0;
+ }
+ c = 0;
+ while ((name = *argptr) != NULL) {
+ if ((cmdp = cmdlookup(name, 0)) != NULL
+ && (cmdp->cmdtype == CMDNORMAL
+ || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
+ delete_cmd_entry();
+ find_command(name, &entry, DO_ERR, pathval());
+ if (entry.cmdtype == CMDUNKNOWN) c = 1;
+ else if (verbose) {
+ cmdp = cmdlookup(name, 0);
+ if (cmdp) printentry(cmdp, verbose);
+ flushall();
+ }
+ argptr++;
+ }
+ return c;
+}
+
+
+static void
+printentry(cmdp, verbose)
+ struct tblentry *cmdp;
+ int verbose;
+ {
+ int idx;
+ const char *path;
+ char *name;
+
+ if (cmdp->cmdtype == CMDNORMAL) {
+ idx = cmdp->param.index;
+ path = pathval();
+ do {
+ name = padvance(&path, cmdp->cmdname);
+ stunalloc(name);
+ } while (--idx >= 0);
+ out1str(name);
+ } else if (cmdp->cmdtype == CMDBUILTIN) {
+ out1fmt("builtin %s", cmdp->cmdname);
+ } else if (cmdp->cmdtype == CMDFUNCTION) {
+ out1fmt("function %s", cmdp->cmdname);
+ if (verbose) {
+ INTOFF;
+ name = commandtext(cmdp->param.func);
+ out1fmt(" %s", name);
+ ckfree(name);
+ INTON;
+ }
+#ifdef DEBUG
+ } else {
+ error("internal error: cmdtype %d", cmdp->cmdtype);
+#endif
+ }
+ out1fmt(snlfmt, cmdp->rehash ? "*" : nullstr);
+}
+
+
+
+/*
+ * Resolve a command name. If you change this routine, you may have to
+ * change the shellexec routine as well.
+ */
+
+static void
+find_command(name, entry, act, path)
+ char *name;
+ struct cmdentry *entry;
+ int act;
+ const char *path;
+{
+ struct tblentry *cmdp;
+ int idx;
+ int prev;
+ char *fullname;
+ struct stat statb;
+ int e;
+ int bltin;
+ int firstchange;
+ int updatetbl;
+ bool regular;
+ struct builtincmd *bcmd;
+
+ /* If name contains a slash, don't use the hash table */
+ if (strchr(name, '/') != NULL) {
+ if (act & DO_ABS) {
+ while (stat(name, &statb) < 0) {
+ #ifdef SYSV
+ if (errno == EINTR)
+ continue;
+ #endif
+ if (errno != ENOENT && errno != ENOTDIR)
+ e = errno;
+ entry->cmdtype = CMDUNKNOWN;
+ entry->u.index = -1;
+ return;
+ }
+ entry->cmdtype = CMDNORMAL;
+ entry->u.index = -1;
+ return;
+ }
+ entry->cmdtype = CMDNORMAL;
+ entry->u.index = 0;
+ return;
+ }
+
+ updatetbl = 1;
+ if (act & DO_BRUTE) {
+ firstchange = path_change(path, &bltin);
+ } else {
+ bltin = builtinloc;
+ firstchange = 9999;
+ }
+
+ /* If name is in the table, and not invalidated by cd, we're done */
+ if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0) {
+ if (cmdp->cmdtype == CMDFUNCTION) {
+ if (act & DO_NOFUN) {
+ updatetbl = 0;
+ } else {
+ goto success;
+ }
+ } else if (act & DO_BRUTE) {
+ if ((cmdp->cmdtype == CMDNORMAL &&
+ cmdp->param.index >= firstchange) ||
+ (cmdp->cmdtype == CMDBUILTIN &&
+ ((builtinloc < 0 && bltin >= 0) ?
+ bltin : builtinloc) >= firstchange)) {
+ /* need to recompute the entry */
+ } else {
+ goto success;
+ }
+ } else {
+ goto success;
+ }
+ }
+
+ bcmd = find_builtin(name);
+ regular = bcmd && bcmd->flags & BUILTIN_REGULAR;
+
+ if (regular) {
+ if (cmdp && (cmdp->cmdtype == CMDBUILTIN)) {
+ goto success;
+ }
+ } else if (act & DO_BRUTE) {
+ if (firstchange == 0) {
+ updatetbl = 0;
+ }
+ }
+
+ /* If %builtin not in path, check for builtin next */
+ if (regular || (bltin < 0 && bcmd)) {
+builtin:
+ if (!updatetbl) {
+ entry->cmdtype = CMDBUILTIN;
+ entry->u.cmd = bcmd;
+ return;
+ }
+ INTOFF;
+ cmdp = cmdlookup(name, 1);
+ cmdp->cmdtype = CMDBUILTIN;
+ cmdp->param.cmd = bcmd;
+ INTON;
+ goto success;
+ }
+
+ /* We have to search path. */
+ prev = -1; /* where to start */
+ if (cmdp && cmdp->rehash) { /* doing a rehash */
+ if (cmdp->cmdtype == CMDBUILTIN)
+ prev = builtinloc;
+ else
+ prev = cmdp->param.index;
+ }
+
+ e = ENOENT;
+ idx = -1;
+loop:
+ while ((fullname = padvance(&path, name)) != NULL) {
+ stunalloc(fullname);
+ idx++;
+ if (idx >= firstchange) {
+ updatetbl = 0;
+ }
+ if (pathopt) {
+ if (prefix("builtin", pathopt)) {
+ if ((bcmd = find_builtin(name))) {
+ goto builtin;
+ }
+ continue;
+ } else if (!(act & DO_NOFUN) &&
+ prefix("func", pathopt)) {
+ /* handled below */
+ } else {
+ continue; /* ignore unimplemented options */
+ }
+ }
+ /* if rehash, don't redo absolute path names */
+ if (fullname[0] == '/' && idx <= prev &&
+ idx < firstchange) {
+ if (idx < prev)
+ continue;
+ TRACE(("searchexec \"%s\": no change\n", name));
+ goto success;
+ }
+ while (stat(fullname, &statb) < 0) {
+#ifdef SYSV
+ if (errno == EINTR)
+ continue;
+#endif
+ if (errno != ENOENT && errno != ENOTDIR)
+ e = errno;
+ goto loop;
+ }
+ e = EACCES; /* if we fail, this will be the error */
+ if (!S_ISREG(statb.st_mode))
+ continue;
+ if (pathopt) { /* this is a %func directory */
+ stalloc(strlen(fullname) + 1);
+ readcmdfile(fullname);
+ if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
+ error("%s not defined in %s", name, fullname);
+ stunalloc(fullname);
+ goto success;
+ }
+#ifdef notdef
+ if (statb.st_uid == geteuid()) {
+ if ((statb.st_mode & 0100) == 0)
+ goto loop;
+ } else if (statb.st_gid == getegid()) {
+ if ((statb.st_mode & 010) == 0)
+ goto loop;
+ } else {
+ if ((statb.st_mode & 01) == 0)
+ goto loop;
+ }
+#endif
+ TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
+ /* If we aren't called with DO_BRUTE and cmdp is set, it must
+ be a function and we're being called with DO_NOFUN */
+ if (!updatetbl) {
+ entry->cmdtype = CMDNORMAL;
+ entry->u.index = idx;
+ return;
+ }
+ INTOFF;
+ cmdp = cmdlookup(name, 1);
+ cmdp->cmdtype = CMDNORMAL;
+ cmdp->param.index = idx;
+ INTON;
+ goto success;
+ }
+
+ /* We failed. If there was an entry for this command, delete it */
+ if (cmdp && updatetbl)
+ delete_cmd_entry();
+ if (act & DO_ERR)
+ outfmt(out2, "%s: %s\n", name, errmsg(e, E_EXEC));
+ entry->cmdtype = CMDUNKNOWN;
+ return;
+
+success:
+ cmdp->rehash = 0;
+ entry->cmdtype = cmdp->cmdtype;
+ entry->u = cmdp->param;
+}
+
+
+
+/*
+ * Search the table of builtin commands.
+ */
+
+struct builtincmd *
+find_builtin(name)
+ char *name;
+{
+ struct builtincmd *bp;
+
+ bp = bsearch( &name, builtincmds, NUMBUILTINS, sizeof(struct builtincmd),
+ pstrcmp
+ );
+ return bp;
+}
+
+
+/*
+ * Called when a cd is done. Marks all commands so the next time they
+ * are executed they will be rehashed.
+ */
+
+static void
+hashcd() {
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+
+ for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
+ for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+ if (cmdp->cmdtype == CMDNORMAL
+ || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
+ cmdp->rehash = 1;
+ }
+ }
+}
+
+
+
+/*
+ * Called before PATH is changed. The argument is the new value of PATH;
+ * pathval() still returns the old value at this point. Called with
+ * interrupts off.
+ */
+
+static void
+changepath(newval)
+ const char *newval;
+{
+ int firstchange;
+ int bltin;
+
+ firstchange = path_change(newval, &bltin);
+ if (builtinloc < 0 && bltin >= 0)
+ builtinloc = bltin; /* zap builtins */
+ clearcmdentry(firstchange);
+ builtinloc = bltin;
+}
+
+
+/*
+ * Clear out command entries. The argument specifies the first entry in
+ * PATH which has changed.
+ */
+
+static void
+clearcmdentry(firstchange)
+ int firstchange;
+{
+ struct tblentry **tblp;
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+
+ INTOFF;
+ for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
+ pp = tblp;
+ while ((cmdp = *pp) != NULL) {
+ if ((cmdp->cmdtype == CMDNORMAL &&
+ cmdp->param.index >= firstchange)
+ || (cmdp->cmdtype == CMDBUILTIN &&
+ builtinloc >= firstchange)) {
+ *pp = cmdp->next;
+ ckfree(cmdp);
+ } else {
+ pp = &cmdp->next;
+ }
+ }
+ }
+ INTON;
+}
+
+
+/*
+ * Delete all functions.
+ */
+
+#ifdef mkinit
+static void deletefuncs __P((void));
+
+SHELLPROC {
+ deletefuncs();
+}
+#endif
+
+static void
+deletefuncs() {
+ struct tblentry **tblp;
+ struct tblentry **pp;
+ struct tblentry *cmdp;
+
+ INTOFF;
+ for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
+ pp = tblp;
+ while ((cmdp = *pp) != NULL) {
+ if (cmdp->cmdtype == CMDFUNCTION) {
+ *pp = cmdp->next;
+ freefunc(cmdp->param.func);
+ ckfree(cmdp);
+ } else {
+ pp = &cmdp->next;
+ }
+ }
+ }
+ INTON;
+}
+
+
+
+/*
+ * Locate a command in the command hash table. If "add" is nonzero,
+ * add the command to the table if it is not already present. The
+ * variable "lastcmdentry" is set to point to the address of the link
+ * pointing to the entry, so that delete_cmd_entry can delete the
+ * entry.
+ */
+
+struct tblentry **lastcmdentry;
+
+
+static struct tblentry *
+cmdlookup(name, add)
+ char *name;
+ int add;
+{
+ int hashval;
+ char *p;
+ struct tblentry *cmdp;
+ struct tblentry **pp;
+
+ p = name;
+ hashval = *p << 4;
+ while (*p)
+ hashval += *p++;
+ hashval &= 0x7FFF;
+ pp = &cmdtable[hashval % CMDTABLESIZE];
+ for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
+ if (equal(cmdp->cmdname, name))
+ break;
+ pp = &cmdp->next;
+ }
+ if (add && cmdp == NULL) {
+ INTOFF;
+ cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
+ + strlen(name) + 1);
+ cmdp->next = NULL;
+ cmdp->cmdtype = CMDUNKNOWN;
+ cmdp->rehash = 0;
+ strcpy(cmdp->cmdname, name);
+ INTON;
+ }
+ lastcmdentry = pp;
+ return cmdp;
+}
+
+/*
+ * Delete the command entry returned on the last lookup.
+ */
+
+static void
+delete_cmd_entry() {
+ struct tblentry *cmdp;
+
+ INTOFF;
+ cmdp = *lastcmdentry;
+ *lastcmdentry = cmdp->next;
+ ckfree(cmdp);
+ INTON;
+}
+
+
+
+#ifdef notdef
+static void
+getcmdentry(name, entry)
+ char *name;
+ struct cmdentry *entry;
+ {
+ struct tblentry *cmdp = cmdlookup(name, 0);
+
+ if (cmdp) {
+ entry->u = cmdp->param;
+ entry->cmdtype = cmdp->cmdtype;
+ } else {
+ entry->cmdtype = CMDUNKNOWN;
+ entry->u.index = 0;
+ }
+}
+#endif
+
+
+/*
+ * Add a new command entry, replacing any existing command entry for
+ * the same name.
+ */
+
+static void
+addcmdentry(name, entry)
+ char *name;
+ struct cmdentry *entry;
+ {
+ struct tblentry *cmdp;
+
+ INTOFF;
+ cmdp = cmdlookup(name, 1);
+ if (cmdp->cmdtype == CMDFUNCTION) {
+ freefunc(cmdp->param.func);
+ }
+ cmdp->cmdtype = entry->cmdtype;
+ cmdp->param = entry->u;
+ INTON;
+}
+
+
+/*
+ * Define a shell function.
+ */
+
+static void
+defun(name, func)
+ char *name;
+ union node *func;
+ {
+ struct cmdentry entry;
+
+ entry.cmdtype = CMDFUNCTION;
+ entry.u.func = copyfunc(func);
+ addcmdentry(name, &entry);
+}
+
+
+/*
+ * Delete a function if it exists.
+ */
+
+static void
+unsetfunc(name)
+ char *name;
+ {
+ struct tblentry *cmdp;
+
+ if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
+ freefunc(cmdp->param.func);
+ delete_cmd_entry();
+ }
+}
+
+#ifdef ASH_TYPE
+/*
+ * Locate and print what a word is...
+ */
+
+static int
+typecmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int i;
+ int err = 0;
+
+ for (i = 1; i < argc; i++) {
+ err |= describe_command(argv[i], 1);
+ }
+ return err;
+}
+
+static int
+describe_command(command, verbose)
+ char *command;
+ int verbose;
+{
+ struct cmdentry entry;
+ struct tblentry *cmdp;
+ const struct alias *ap;
+ const char *path = pathval();
+
+ if (verbose) {
+ out1str(command);
+ }
+
+ /* First look at the keywords */
+ if (findkwd(command)) {
+ out1str(verbose ? " is a shell keyword" : command);
+ goto out;
+ }
+
+ /* Then look at the aliases */
+ if ((ap = lookupalias(command, 0)) != NULL) {
+ if (verbose) {
+ out1fmt(" is an alias for %s", ap->val);
+ } else {
+ printalias(ap);
+ }
+ goto out;
+ }
+
+ /* Then check if it is a tracked alias */
+ if ((cmdp = cmdlookup(command, 0)) != NULL) {
+ entry.cmdtype = cmdp->cmdtype;
+ entry.u = cmdp->param;
+ } else {
+ /* Finally use brute force */
+ find_command(command, &entry, DO_ABS, path);
+ }
+
+ switch (entry.cmdtype) {
+ case CMDNORMAL: {
+ int j = entry.u.index;
+ char *p;
+ if (j == -1) {
+ p = command;
+ } else {
+ do {
+ p = padvance(&path, command);
+ stunalloc(p);
+ } while (--j >= 0);
+ }
+ if (verbose) {
+ out1fmt(
+ " is%s %s",
+ cmdp ? " a tracked alias for" : nullstr, p
+ );
+ } else {
+ out1str(p);
+ }
+ break;
+ }
+
+ case CMDFUNCTION:
+ if (verbose) {
+ out1str(" is a shell function");
+ } else {
+ out1str(command);
+ }
+ break;
+
+ case CMDBUILTIN:
+ if (verbose) {
+ out1fmt(
+ " is a %sshell builtin",
+ entry.u.cmd->flags & BUILTIN_SPECIAL ?
+ "special " : nullstr
+ );
+ } else {
+ out1str(command);
+ }
+ break;
+
+ default:
+ if (verbose) {
+ out1str(": not found\n");
+ }
+ return 127;
+ }
+
+out:
+ out1c('\n');
+ return 0;
+}
+#endif
+
+static int
+commandcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int c;
+ int default_path = 0;
+ int verify_only = 0;
+ int verbose_verify_only = 0;
+
+ while ((c = nextopt("pvV")) != '\0')
+ switch (c) {
+ case 'p':
+ default_path = 1;
+ break;
+ case 'v':
+ verify_only = 1;
+ break;
+ case 'V':
+ verbose_verify_only = 1;
+ break;
+ default:
+ outfmt(out2,
+"command: nextopt returned character code 0%o\n", c);
+ return EX_SOFTWARE;
+ }
+
+ if (default_path + verify_only + verbose_verify_only > 1 ||
+ !*argptr) {
+ outfmt(out2,
+"command [-p] command [arg ...]\n");
+ outfmt(out2,
+"command {-v|-V} command\n");
+ return EX_USAGE;
+ }
+
+#ifdef ASH_TYPE
+ if (verify_only || verbose_verify_only) {
+ return describe_command(*argptr, verbose_verify_only);
+ }
+#endif
+
+ return 0;
+}
+
+static int
+path_change(newval, bltin)
+ const char *newval;
+ int *bltin;
+{
+ const char *old, *new;
+ int idx;
+ int firstchange;
+
+ old = pathval();
+ new = newval;
+ firstchange = 9999; /* assume no change */
+ idx = 0;
+ *bltin = -1;
+ for (;;) {
+ if (*old != *new) {
+ firstchange = idx;
+ if ((*old == '\0' && *new == ':')
+ || (*old == ':' && *new == '\0'))
+ firstchange++;
+ old = new; /* ignore subsequent differences */
+ }
+ if (*new == '\0')
+ break;
+ if (*new == '%' && *bltin < 0 && prefix("builtin", new + 1))
+ *bltin = idx;
+ if (*new == ':') {
+ idx++;
+ }
+ new++, old++;
+ }
+ if (builtinloc >= 0 && *bltin < 0)
+ firstchange = 0;
+ return firstchange;
+}
+/* $NetBSD: expand.c,v 1.50 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Routines to expand arguments to commands. We have to deal with
+ * backquotes, shell variables, and file metacharacters.
+ */
+/*
+ * _rmescape() flags
+ */
+#define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
+#define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
+
+/*
+ * Structure specifying which parts of the string should be searched
+ * for IFS characters.
+ */
+
+struct ifsregion {
+ struct ifsregion *next; /* next region in list */
+ int begoff; /* offset of start of region */
+ int endoff; /* offset of end of region */
+ int nulonly; /* search for nul bytes only */
+};
+
+
+static char *expdest; /* output of current string */
+struct nodelist *argbackq; /* list of back quote expressions */
+struct ifsregion ifsfirst; /* first struct in list of ifs regions */
+struct ifsregion *ifslastp; /* last struct in list */
+struct arglist exparg; /* holds expanded arg list */
+
+static void argstr __P((char *, int));
+static char *exptilde __P((char *, int));
+static void expbackq __P((union node *, int, int));
+static int subevalvar __P((char *, char *, int, int, int, int, int));
+static char *evalvar __P((char *, int));
+static int varisset __P((char *, int));
+static void strtodest __P((const char *, const char *, int));
+static void varvalue __P((char *, int, int));
+static void recordregion __P((int, int, int));
+static void removerecordregions __P((int));
+static void ifsbreakup __P((char *, struct arglist *));
+static void ifsfree __P((void));
+static void expandmeta __P((struct strlist *, int));
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN)
+#define preglob(p) _rmescapes((p), RMESCAPE_ALLOC | RMESCAPE_GLOB)
+#if !defined(GLOB_BROKEN)
+static void addglob __P((const glob_t *));
+#endif
+#endif
+#if !(defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
+static void expmeta __P((char *, char *));
+#endif
+static void addfname __P((char *));
+#if !(defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
+static struct strlist *expsort __P((struct strlist *));
+static struct strlist *msort __P((struct strlist *, int));
+#endif
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN)
+static int patmatch __P((char *, char *, int));
+static int patmatch2 __P((char *, char *, int));
+#else
+static int pmatch __P((char *, char *, int));
+#define patmatch2 patmatch
+#endif
+static char *cvtnum __P((int, char *));
+
+extern int oexitstatus;
+
+/*
+ * Expand shell variables and backquotes inside a here document.
+ */
+
+static void
+expandhere(arg, fd)
+ union node *arg; /* the document */
+ int fd; /* where to write the expanded version */
+ {
+ herefd = fd;
+ expandarg(arg, (struct arglist *)NULL, 0);
+ xwrite(fd, stackblock(), expdest - stackblock());
+}
+
+
+/*
+ * Perform variable substitution and command substitution on an argument,
+ * placing the resulting list of arguments in arglist. If EXP_FULL is true,
+ * perform splitting and file name expansion. When arglist is NULL, perform
+ * here document expansion.
+ */
+
+static void
+expandarg(arg, arglist, flag)
+ union node *arg;
+ struct arglist *arglist;
+ int flag;
+{
+ struct strlist *sp;
+ char *p;
+
+ argbackq = arg->narg.backquote;
+ STARTSTACKSTR(expdest);
+ ifsfirst.next = NULL;
+ ifslastp = NULL;
+ argstr(arg->narg.text, flag);
+ if (arglist == NULL) {
+ return; /* here document expanded */
+ }
+ STPUTC('\0', expdest);
+ p = grabstackstr(expdest);
+ exparg.lastp = &exparg.list;
+ /*
+ * TODO - EXP_REDIR
+ */
+ if (flag & EXP_FULL) {
+ ifsbreakup(p, &exparg);
+ *exparg.lastp = NULL;
+ exparg.lastp = &exparg.list;
+ expandmeta(exparg.list, flag);
+ } else {
+ if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
+ rmescapes(p);
+ sp = (struct strlist *)stalloc(sizeof (struct strlist));
+ sp->text = p;
+ *exparg.lastp = sp;
+ exparg.lastp = &sp->next;
+ }
+ ifsfree();
+ *exparg.lastp = NULL;
+ if (exparg.list) {
+ *arglist->lastp = exparg.list;
+ arglist->lastp = exparg.lastp;
+ }
+}
+
+
+
+/*
+ * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
+ * characters to allow for further processing. Otherwise treat
+ * $@ like $* since no splitting will be performed.
+ */
+
+static void
+argstr(p, flag)
+ char *p;
+ int flag;
+{
+ char c;
+ int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
+ int firsteq = 1;
+
+ if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
+ p = exptilde(p, flag);
+ for (;;) {
+ switch (c = *p++) {
+ case '\0':
+ case CTLENDVAR: /* ??? */
+ goto breakloop;
+ case CTLQUOTEMARK:
+ /* "$@" syntax adherence hack */
+ if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
+ break;
+ if ((flag & EXP_FULL) != 0)
+ STPUTC(c, expdest);
+ break;
+ case CTLESC:
+ if (quotes)
+ STPUTC(c, expdest);
+ c = *p++;
+ STPUTC(c, expdest);
+ break;
+ case CTLVAR:
+ p = evalvar(p, flag);
+ break;
+ case CTLBACKQ:
+ case CTLBACKQ|CTLQUOTE:
+ expbackq(argbackq->n, c & CTLQUOTE, flag);
+ argbackq = argbackq->next;
+ break;
+#ifdef ASH_MATH_SUPPORT
+ case CTLENDARI:
+ expari(flag);
+ break;
+#endif
+ case ':':
+ case '=':
+ /*
+ * sort of a hack - expand tildes in variable
+ * assignments (after the first '=' and after ':'s).
+ */
+ STPUTC(c, expdest);
+ if (flag & EXP_VARTILDE && *p == '~') {
+ if (c == '=') {
+ if (firsteq)
+ firsteq = 0;
+ else
+ break;
+ }
+ p = exptilde(p, flag);
+ }
+ break;
+ default:
+ STPUTC(c, expdest);
+ }
+ }
+breakloop:;
+ return;
+}
+
+static char *
+exptilde(p, flag)
+ char *p;
+ int flag;
+{
+ char c, *startp = p;
+ struct passwd *pw;
+ const char *home;
+ int quotes = flag & (EXP_FULL | EXP_CASE);
+
+ while ((c = *p) != '\0') {
+ switch(c) {
+ case CTLESC:
+ return (startp);
+ case CTLQUOTEMARK:
+ return (startp);
+ case ':':
+ if (flag & EXP_VARTILDE)
+ goto done;
+ break;
+ case '/':
+ goto done;
+ }
+ p++;
+ }
+done:
+ *p = '\0';
+ if (*(startp+1) == '\0') {
+ if ((home = lookupvar("HOME")) == NULL)
+ goto lose;
+ } else {
+ if ((pw = getpwnam(startp+1)) == NULL)
+ goto lose;
+ home = pw->pw_dir;
+ }
+ if (*home == '\0')
+ goto lose;
+ *p = c;
+ strtodest(home, SQSYNTAX, quotes);
+ return (p);
+lose:
+ *p = c;
+ return (startp);
+}
+
+
+static void
+removerecordregions(endoff)
+ int endoff;
+{
+ if (ifslastp == NULL)
+ return;
+
+ if (ifsfirst.endoff > endoff) {
+ while (ifsfirst.next != NULL) {
+ struct ifsregion *ifsp;
+ INTOFF;
+ ifsp = ifsfirst.next->next;
+ ckfree(ifsfirst.next);
+ ifsfirst.next = ifsp;
+ INTON;
+ }
+ if (ifsfirst.begoff > endoff)
+ ifslastp = NULL;
+ else {
+ ifslastp = &ifsfirst;
+ ifsfirst.endoff = endoff;
+ }
+ return;
+ }
+
+ ifslastp = &ifsfirst;
+ while (ifslastp->next && ifslastp->next->begoff < endoff)
+ ifslastp=ifslastp->next;
+ while (ifslastp->next != NULL) {
+ struct ifsregion *ifsp;
+ INTOFF;
+ ifsp = ifslastp->next->next;
+ ckfree(ifslastp->next);
+ ifslastp->next = ifsp;
+ INTON;
+ }
+ if (ifslastp->endoff > endoff)
+ ifslastp->endoff = endoff;
+}
+
+
+#ifdef ASH_MATH_SUPPORT
+/*
+ * Expand arithmetic expression. Backup to start of expression,
+ * evaluate, place result in (backed up) result, adjust string position.
+ */
+static void
+expari(flag)
+ int flag;
+{
+ char *p, *start;
+ int result;
+ int begoff;
+ int quotes = flag & (EXP_FULL | EXP_CASE);
+ int quoted;
+
+ /* ifsfree(); */
+
+ /*
+ * This routine is slightly over-complicated for
+ * efficiency. First we make sure there is
+ * enough space for the result, which may be bigger
+ * than the expression if we add exponentation. Next we
+ * scan backwards looking for the start of arithmetic. If the
+ * next previous character is a CTLESC character, then we
+ * have to rescan starting from the beginning since CTLESC
+ * characters have to be processed left to right.
+ */
+ CHECKSTRSPACE(10, expdest);
+ USTPUTC('\0', expdest);
+ start = stackblock();
+ p = expdest - 1;
+ while (*p != CTLARI && p >= start)
+ --p;
+ if (*p != CTLARI)
+ error("missing CTLARI (shouldn't happen)");
+ if (p > start && *(p-1) == CTLESC)
+ for (p = start; *p != CTLARI; p++)
+ if (*p == CTLESC)
+ p++;
+
+ if (p[1] == '"')
+ quoted=1;
+ else
+ quoted=0;
+ begoff = p - start;
+ removerecordregions(begoff);
+ if (quotes)
+ rmescapes(p+2);
+ result = arith(p+2);
+ fmtstr(p, 12, "%d", result);
+
+ while (*p++)
+ ;
+
+ if (quoted == 0)
+ recordregion(begoff, p - 1 - start, 0);
+ result = expdest - p + 1;
+ STADJUST(-result, expdest);
+}
+#endif
+
+
+/*
+ * Expand stuff in backwards quotes.
+ */
+
+static void
+expbackq(cmd, quoted, flag)
+ union node *cmd;
+ int quoted;
+ int flag;
+{
+ volatile struct backcmd in;
+ int i;
+ char buf[128];
+ char *p;
+ char *dest = expdest;
+ volatile struct ifsregion saveifs;
+ struct ifsregion *volatile savelastp;
+ struct nodelist *volatile saveargbackq;
+ char lastc;
+ int startloc = dest - stackblock();
+ char const *syntax = quoted? DQSYNTAX : BASESYNTAX;
+ volatile int saveherefd;
+ int quotes = flag & (EXP_FULL | EXP_CASE);
+ struct jmploc jmploc;
+ struct jmploc *volatile savehandler;
+ int ex;
+
+#if __GNUC__
+ /* Avoid longjmp clobbering */
+ (void) &dest;
+ (void) &syntax;
+#endif
+
+ in.fd = -1;
+ in.buf = 0;
+ in.jp = 0;
+
+ INTOFF;
+ saveifs = ifsfirst;
+ savelastp = ifslastp;
+ saveargbackq = argbackq;
+ saveherefd = herefd;
+ herefd = -1;
+ if ((ex = setjmp(jmploc.loc))) {
+ goto err1;
+ }
+ savehandler = handler;
+ handler = &jmploc;
+ INTON;
+ p = grabstackstr(dest);
+ evalbackcmd(cmd, (struct backcmd *) &in);
+ ungrabstackstr(p, dest);
+err1:
+ INTOFF;
+ ifsfirst = saveifs;
+ ifslastp = savelastp;
+ argbackq = saveargbackq;
+ herefd = saveherefd;
+ if (ex) {
+ goto err2;
+ }
+
+ p = in.buf;
+ lastc = '\0';
+ for (;;) {
+ if (--in.nleft < 0) {
+ if (in.fd < 0)
+ break;
+ while ((i = read(in.fd, buf, sizeof buf)) < 0 && errno == EINTR);
+ TRACE(("expbackq: read returns %d\n", i));
+ if (i <= 0)
+ break;
+ p = buf;
+ in.nleft = i - 1;
+ }
+ lastc = *p++;
+ if (lastc != '\0') {
+ if (quotes && syntax[(int)lastc] == CCTL)
+ STPUTC(CTLESC, dest);
+ STPUTC(lastc, dest);
+ }
+ }
+
+ /* Eat all trailing newlines */
+ for (; dest > stackblock() && dest[-1] == '\n';)
+ STUNPUTC(dest);
+
+err2:
+ if (in.fd >= 0)
+ close(in.fd);
+ if (in.buf)
+ ckfree(in.buf);
+ if (in.jp)
+ exitstatus = waitforjob(in.jp);
+ handler = savehandler;
+ if (ex) {
+ longjmp(handler->loc, 1);
+ }
+ if (quoted == 0)
+ recordregion(startloc, dest - stackblock(), 0);
+ TRACE(("evalbackq: size=%d: \"%.*s\"\n",
+ (dest - stackblock()) - startloc,
+ (dest - stackblock()) - startloc,
+ stackblock() + startloc));
+ expdest = dest;
+ INTON;
+}
+
+
+
+static int
+subevalvar(p, str, strloc, subtype, startloc, varflags, quotes)
+ char *p;
+ char *str;
+ int strloc;
+ int subtype;
+ int startloc;
+ int varflags;
+ int quotes;
+{
+ char *startp;
+ char *loc = NULL;
+ char *q;
+ int c = 0;
+ int saveherefd = herefd;
+ struct nodelist *saveargbackq = argbackq;
+ int amount;
+
+ herefd = -1;
+ argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0);
+ STACKSTRNUL(expdest);
+ herefd = saveherefd;
+ argbackq = saveargbackq;
+ startp = stackblock() + startloc;
+ if (str == NULL)
+ str = stackblock() + strloc;
+
+ switch (subtype) {
+ case VSASSIGN:
+ setvar(str, startp, 0);
+ amount = startp - expdest;
+ STADJUST(amount, expdest);
+ varflags &= ~VSNUL;
+ if (c != 0)
+ *loc = c;
+ return 1;
+
+ case VSQUESTION:
+ if (*p != CTLENDVAR) {
+ outfmt(&errout, snlfmt, startp);
+ error((char *)NULL);
+ }
+ error("%.*s: parameter %snot set", p - str - 1,
+ str, (varflags & VSNUL) ? "null or "
+ : nullstr);
+ /* NOTREACHED */
+
+ case VSTRIMLEFT:
+ for (loc = startp; loc < str; loc++) {
+ c = *loc;
+ *loc = '\0';
+ if (patmatch2(str, startp, quotes))
+ goto recordleft;
+ *loc = c;
+ if (quotes && *loc == CTLESC)
+ loc++;
+ }
+ return 0;
+
+ case VSTRIMLEFTMAX:
+ for (loc = str - 1; loc >= startp;) {
+ c = *loc;
+ *loc = '\0';
+ if (patmatch2(str, startp, quotes))
+ goto recordleft;
+ *loc = c;
+ loc--;
+ if (quotes && loc > startp && *(loc - 1) == CTLESC) {
+ for (q = startp; q < loc; q++)
+ if (*q == CTLESC)
+ q++;
+ if (q > loc)
+ loc--;
+ }
+ }
+ return 0;
+
+ case VSTRIMRIGHT:
+ for (loc = str - 1; loc >= startp;) {
+ if (patmatch2(str, loc, quotes))
+ goto recordright;
+ loc--;
+ if (quotes && loc > startp && *(loc - 1) == CTLESC) {
+ for (q = startp; q < loc; q++)
+ if (*q == CTLESC)
+ q++;
+ if (q > loc)
+ loc--;
+ }
+ }
+ return 0;
+
+ case VSTRIMRIGHTMAX:
+ for (loc = startp; loc < str - 1; loc++) {
+ if (patmatch2(str, loc, quotes))
+ goto recordright;
+ if (quotes && *loc == CTLESC)
+ loc++;
+ }
+ return 0;
+
+#ifdef DEBUG
+ default:
+ abort();
+#endif
+ }
+
+recordleft:
+ *loc = c;
+ amount = ((str - 1) - (loc - startp)) - expdest;
+ STADJUST(amount, expdest);
+ while (loc != str - 1)
+ *startp++ = *loc++;
+ return 1;
+
+recordright:
+ amount = loc - expdest;
+ STADJUST(amount, expdest);
+ STPUTC('\0', expdest);
+ STADJUST(-1, expdest);
+ return 1;
+}
+
+
+/*
+ * Expand a variable, and return a pointer to the next character in the
+ * input string.
+ */
+
+static char *
+evalvar(p, flag)
+ char *p;
+ int flag;
+{
+ int subtype;
+ int varflags;
+ char *var;
+ char *val;
+ int patloc;
+ int c;
+ int set;
+ int special;
+ int startloc;
+ int varlen;
+ int easy;
+ int quotes = flag & (EXP_FULL | EXP_CASE);
+
+ varflags = *p++;
+ subtype = varflags & VSTYPE;
+ var = p;
+ special = 0;
+ if (! is_name(*p))
+ special = 1;
+ p = strchr(p, '=') + 1;
+again: /* jump here after setting a variable with ${var=text} */
+ if (special) {
+ set = varisset(var, varflags & VSNUL);
+ val = NULL;
+ } else {
+ val = lookupvar(var);
+ if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
+ val = NULL;
+ set = 0;
+ } else
+ set = 1;
+ }
+ varlen = 0;
+ startloc = expdest - stackblock();
+ if (set && subtype != VSPLUS) {
+ /* insert the value of the variable */
+ if (special) {
+ varvalue(var, varflags & VSQUOTE, flag);
+ if (subtype == VSLENGTH) {
+ varlen = expdest - stackblock() - startloc;
+ STADJUST(-varlen, expdest);
+ }
+ } else {
+ if (subtype == VSLENGTH) {
+ varlen = strlen(val);
+ } else {
+ strtodest(
+ val,
+ varflags & VSQUOTE ?
+ DQSYNTAX : BASESYNTAX,
+ quotes
+ );
+ }
+ }
+ }
+
+ if (subtype == VSPLUS)
+ set = ! set;
+
+ easy = ((varflags & VSQUOTE) == 0 ||
+ (*var == '@' && shellparam.nparam != 1));
+
+
+ switch (subtype) {
+ case VSLENGTH:
+ expdest = cvtnum(varlen, expdest);
+ goto record;
+
+ case VSNORMAL:
+ if (!easy)
+ break;
+record:
+ recordregion(startloc, expdest - stackblock(),
+ varflags & VSQUOTE);
+ break;
+
+ case VSPLUS:
+ case VSMINUS:
+ if (!set) {
+ argstr(p, flag);
+ break;
+ }
+ if (easy)
+ goto record;
+ break;
+
+ case VSTRIMLEFT:
+ case VSTRIMLEFTMAX:
+ case VSTRIMRIGHT:
+ case VSTRIMRIGHTMAX:
+ if (!set)
+ break;
+ /*
+ * Terminate the string and start recording the pattern
+ * right after it
+ */
+ STPUTC('\0', expdest);
+ patloc = expdest - stackblock();
+ if (subevalvar(p, NULL, patloc, subtype,
+ startloc, varflags, quotes) == 0) {
+ int amount = (expdest - stackblock() - patloc) + 1;
+ STADJUST(-amount, expdest);
+ }
+ /* Remove any recorded regions beyond start of variable */
+ removerecordregions(startloc);
+ goto record;
+
+ case VSASSIGN:
+ case VSQUESTION:
+ if (!set) {
+ if (subevalvar(p, var, 0, subtype, startloc,
+ varflags, quotes)) {
+ varflags &= ~VSNUL;
+ /*
+ * Remove any recorded regions beyond
+ * start of variable
+ */
+ removerecordregions(startloc);
+ goto again;
+ }
+ break;
+ }
+ if (easy)
+ goto record;
+ break;
+
+#ifdef DEBUG
+ default:
+ abort();
+#endif
+ }
+
+ if (subtype != VSNORMAL) { /* skip to end of alternative */
+ int nesting = 1;
+ for (;;) {
+ if ((c = *p++) == CTLESC)
+ p++;
+ else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
+ if (set)
+ argbackq = argbackq->next;
+ } else if (c == CTLVAR) {
+ if ((*p++ & VSTYPE) != VSNORMAL)
+ nesting++;
+ } else if (c == CTLENDVAR) {
+ if (--nesting == 0)
+ break;
+ }
+ }
+ }
+ return p;
+}
+
+
+
+/*
+ * Test whether a specialized variable is set.
+ */
+
+static int
+varisset(name, nulok)
+ char *name;
+ int nulok;
+{
+ if (*name == '!')
+ return backgndpid != -1;
+ else if (*name == '@' || *name == '*') {
+ if (*shellparam.p == NULL)
+ return 0;
+
+ if (nulok) {
+ char **av;
+
+ for (av = shellparam.p; *av; av++)
+ if (**av != '\0')
+ return 1;
+ return 0;
+ }
+ } else if (is_digit(*name)) {
+ char *ap;
+ int num = atoi(name);
+
+ if (num > shellparam.nparam)
+ return 0;
+
+ if (num == 0)
+ ap = arg0;
+ else
+ ap = shellparam.p[num - 1];
+
+ if (nulok && (ap == NULL || *ap == '\0'))
+ return 0;
+ }
+ return 1;
+}
+
+
+
+/*
+ * Put a string on the stack.
+ */
+
+static void
+strtodest(p, syntax, quotes)
+ const char *p;
+ const char *syntax;
+ int quotes;
+{
+ while (*p) {
+ if (quotes && syntax[(int) *p] == CCTL)
+ STPUTC(CTLESC, expdest);
+ STPUTC(*p++, expdest);
+ }
+}
+
+
+
+/*
+ * Add the value of a specialized variable to the stack string.
+ */
+
+static void
+varvalue(name, quoted, flags)
+ char *name;
+ int quoted;
+ int flags;
+{
+ int num;
+ char *p;
+ int i;
+ int sep;
+ int sepq = 0;
+ char **ap;
+ char const *syntax;
+ int allow_split = flags & EXP_FULL;
+ int quotes = flags & (EXP_FULL | EXP_CASE);
+
+ syntax = quoted ? DQSYNTAX : BASESYNTAX;
+ switch (*name) {
+ case '$':
+ num = rootpid;
+ goto numvar;
+ case '?':
+ num = oexitstatus;
+ goto numvar;
+ case '#':
+ num = shellparam.nparam;
+ goto numvar;
+ case '!':
+ num = backgndpid;
+numvar:
+ expdest = cvtnum(num, expdest);
+ break;
+ case '-':
+ for (i = 0 ; i < NOPTS ; i++) {
+ if (optlist[i].val)
+ STPUTC(optlist[i].letter, expdest);
+ }
+ break;
+ case '@':
+ if (allow_split && quoted) {
+ sep = 1 << CHAR_BIT;
+ goto param;
+ }
+ /* fall through */
+ case '*':
+ sep = ifsset() ? ifsval()[0] : ' ';
+ if (quotes) {
+ sepq = syntax[(int) sep] == CCTL;
+ }
+param:
+ for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
+ strtodest(p, syntax, quotes);
+ if (*ap && sep) {
+ if (sepq)
+ STPUTC(CTLESC, expdest);
+ STPUTC(sep, expdest);
+ }
+ }
+ break;
+ case '0':
+ strtodest(arg0, syntax, quotes);
+ break;
+ default:
+ num = atoi(name);
+ if (num > 0 && num <= shellparam.nparam) {
+ strtodest(shellparam.p[num - 1], syntax, quotes);
+ }
+ break;
+ }
+}
+
+
+
+/*
+ * Record the fact that we have to scan this region of the
+ * string for IFS characters.
+ */
+
+static void
+recordregion(start, end, nulonly)
+ int start;
+ int end;
+ int nulonly;
+{
+ struct ifsregion *ifsp;
+
+ if (ifslastp == NULL) {
+ ifsp = &ifsfirst;
+ } else {
+ INTOFF;
+ ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
+ ifsp->next = NULL;
+ ifslastp->next = ifsp;
+ INTON;
+ }
+ ifslastp = ifsp;
+ ifslastp->begoff = start;
+ ifslastp->endoff = end;
+ ifslastp->nulonly = nulonly;
+}
+
+
+
+/*
+ * Break the argument string into pieces based upon IFS and add the
+ * strings to the argument list. The regions of the string to be
+ * searched for IFS characters have been stored by recordregion.
+ */
+static void
+ifsbreakup(string, arglist)
+ char *string;
+ struct arglist *arglist;
+ {
+ struct ifsregion *ifsp;
+ struct strlist *sp;
+ char *start;
+ char *p;
+ char *q;
+ const char *ifs, *realifs;
+ int ifsspc;
+ int nulonly;
+
+
+ start = string;
+ ifsspc = 0;
+ nulonly = 0;
+ realifs = ifsset() ? ifsval() : defifs;
+ if (ifslastp != NULL) {
+ ifsp = &ifsfirst;
+ do {
+ p = string + ifsp->begoff;
+ nulonly = ifsp->nulonly;
+ ifs = nulonly ? nullstr : realifs;
+ ifsspc = 0;
+ while (p < string + ifsp->endoff) {
+ q = p;
+ if (*p == CTLESC)
+ p++;
+ if (strchr(ifs, *p)) {
+ if (!nulonly)
+ ifsspc = (strchr(defifs, *p) != NULL);
+ /* Ignore IFS whitespace at start */
+ if (q == start && ifsspc) {
+ p++;
+ start = p;
+ continue;
+ }
+ *q = '\0';
+ sp = (struct strlist *)stalloc(sizeof *sp);
+ sp->text = start;
+ *arglist->lastp = sp;
+ arglist->lastp = &sp->next;
+ p++;
+ if (!nulonly) {
+ for (;;) {
+ if (p >= string + ifsp->endoff) {
+ break;
+ }
+ q = p;
+ if (*p == CTLESC)
+ p++;
+ if (strchr(ifs, *p) == NULL ) {
+ p = q;
+ break;
+ } else if (strchr(defifs, *p) == NULL) {
+ if (ifsspc) {
+ p++;
+ ifsspc = 0;
+ } else {
+ p = q;
+ break;
+ }
+ } else
+ p++;
+ }
+ }
+ start = p;
+ } else
+ p++;
+ }
+ } while ((ifsp = ifsp->next) != NULL);
+ if (!(*start || (!ifsspc && start > string && nulonly))) {
+ return;
+ }
+ }
+
+ sp = (struct strlist *)stalloc(sizeof *sp);
+ sp->text = start;
+ *arglist->lastp = sp;
+ arglist->lastp = &sp->next;
+}
+
+static void
+ifsfree()
+{
+ while (ifsfirst.next != NULL) {
+ struct ifsregion *ifsp;
+ INTOFF;
+ ifsp = ifsfirst.next->next;
+ ckfree(ifsfirst.next);
+ ifsfirst.next = ifsp;
+ INTON;
+ }
+ ifslastp = NULL;
+ ifsfirst.next = NULL;
+}
+
+
+
+/*
+ * Expand shell metacharacters. At this point, the only control characters
+ * should be escapes. The results are stored in the list exparg.
+ */
+
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN)
+static void
+expandmeta(str, flag)
+ struct strlist *str;
+ int flag;
+{
+ const char *p;
+ glob_t pglob;
+ /* TODO - EXP_REDIR */
+
+ while (str) {
+ if (fflag)
+ goto nometa;
+ p = preglob(str->text);
+ INTOFF;
+ switch (glob(p, GLOB_NOMAGIC, 0, &pglob)) {
+ case 0:
+ if (!(pglob.gl_flags & GLOB_MAGCHAR))
+ goto nometa2;
+ addglob(&pglob);
+ globfree(&pglob);
+ INTON;
+ break;
+ case GLOB_NOMATCH:
+nometa2:
+ globfree(&pglob);
+ INTON;
+nometa:
+ *exparg.lastp = str;
+ rmescapes(str->text);
+ exparg.lastp = &str->next;
+ break;
+ default: /* GLOB_NOSPACE */
+ error("Out of space");
+ }
+ str = str->next;
+ }
+}
+
+
+/*
+ * Add the result of glob(3) to the list.
+ */
+
+static void
+addglob(pglob)
+ const glob_t *pglob;
+{
+ char **p = pglob->gl_pathv;
+
+ do {
+ addfname(*p);
+ } while (*++p);
+}
+
+
+#else /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
+static char *expdir;
+
+
+static void
+expandmeta(str, flag)
+ struct strlist *str;
+ int flag;
+{
+ char *p;
+ struct strlist **savelastp;
+ struct strlist *sp;
+ char c;
+ /* TODO - EXP_REDIR */
+
+ while (str) {
+ if (fflag)
+ goto nometa;
+ p = str->text;
+ for (;;) { /* fast check for meta chars */
+ if ((c = *p++) == '\0')
+ goto nometa;
+ if (c == '*' || c == '?' || c == '[' || c == '!')
+ break;
+ }
+ savelastp = exparg.lastp;
+ INTOFF;
+ if (expdir == NULL) {
+ int i = strlen(str->text);
+ expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
+ }
+
+ expmeta(expdir, str->text);
+ ckfree(expdir);
+ expdir = NULL;
+ INTON;
+ if (exparg.lastp == savelastp) {
+ /*
+ * no matches
+ */
+nometa:
+ *exparg.lastp = str;
+ rmescapes(str->text);
+ exparg.lastp = &str->next;
+ } else {
+ *exparg.lastp = NULL;
+ *savelastp = sp = expsort(*savelastp);
+ while (sp->next != NULL)
+ sp = sp->next;
+ exparg.lastp = &sp->next;
+ }
+ str = str->next;
+ }
+}
+
+
+/*
+ * Do metacharacter (i.e. *, ?, [...]) expansion.
+ */
+
+static void
+expmeta(enddir, name)
+ char *enddir;
+ char *name;
+ {
+ char *p;
+ const char *cp;
+ char *q;
+ char *start;
+ char *endname;
+ int metaflag;
+ struct stat statb;
+ DIR *dirp;
+ struct dirent *dp;
+ int atend;
+ int matchdot;
+
+ metaflag = 0;
+ start = name;
+ for (p = name ; ; p++) {
+ if (*p == '*' || *p == '?')
+ metaflag = 1;
+ else if (*p == '[') {
+ q = p + 1;
+ if (*q == '!')
+ q++;
+ for (;;) {
+ while (*q == CTLQUOTEMARK)
+ q++;
+ if (*q == CTLESC)
+ q++;
+ if (*q == '/' || *q == '\0')
+ break;
+ if (*++q == ']') {
+ metaflag = 1;
+ break;
+ }
+ }
+ } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) {
+ metaflag = 1;
+ } else if (*p == '\0')
+ break;
+ else if (*p == CTLQUOTEMARK)
+ continue;
+ else if (*p == CTLESC)
+ p++;
+ if (*p == '/') {
+ if (metaflag)
+ break;
+ start = p + 1;
+ }
+ }
+ if (metaflag == 0) { /* we've reached the end of the file name */
+ if (enddir != expdir)
+ metaflag++;
+ for (p = name ; ; p++) {
+ if (*p == CTLQUOTEMARK)
+ continue;
+ if (*p == CTLESC)
+ p++;
+ *enddir++ = *p;
+ if (*p == '\0')
+ break;
+ }
+ if (metaflag == 0 || lstat(expdir, &statb) >= 0)
+ addfname(expdir);
+ return;
+ }
+ endname = p;
+ if (start != name) {
+ p = name;
+ while (p < start) {
+ while (*p == CTLQUOTEMARK)
+ p++;
+ if (*p == CTLESC)
+ p++;
+ *enddir++ = *p++;
+ }
+ }
+ if (enddir == expdir) {
+ cp = ".";
+ } else if (enddir == expdir + 1 && *expdir == '/') {
+ cp = "/";
+ } else {
+ cp = expdir;
+ enddir[-1] = '\0';
+ }
+ if ((dirp = opendir(cp)) == NULL)
+ return;
+ if (enddir != expdir)
+ enddir[-1] = '/';
+ if (*endname == 0) {
+ atend = 1;
+ } else {
+ atend = 0;
+ *endname++ = '\0';
+ }
+ matchdot = 0;
+ p = start;
+ while (*p == CTLQUOTEMARK)
+ p++;
+ if (*p == CTLESC)
+ p++;
+ if (*p == '.')
+ matchdot++;
+ while (! int_pending() && (dp = readdir(dirp)) != NULL) {
+ if (dp->d_name[0] == '.' && ! matchdot)
+ continue;
+ if (patmatch(start, dp->d_name, 0)) {
+ if (atend) {
+ scopy(dp->d_name, enddir);
+ addfname(expdir);
+ } else {
+ for (p = enddir, cp = dp->d_name;
+ (*p++ = *cp++) != '\0';)
+ continue;
+ p[-1] = '/';
+ expmeta(p, endname);
+ }
+ }
+ }
+ closedir(dirp);
+ if (! atend)
+ endname[-1] = '/';
+}
+#endif /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
+
+
+/*
+ * Add a file name to the list.
+ */
+
+static void
+addfname(name)
+ char *name;
+ {
+ char *p;
+ struct strlist *sp;
+
+ p = sstrdup(name);
+ sp = (struct strlist *)stalloc(sizeof *sp);
+ sp->text = p;
+ *exparg.lastp = sp;
+ exparg.lastp = &sp->next;
+}
+
+
+#if !(defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
+/*
+ * Sort the results of file name expansion. It calculates the number of
+ * strings to sort and then calls msort (short for merge sort) to do the
+ * work.
+ */
+
+static struct strlist *
+expsort(str)
+ struct strlist *str;
+ {
+ int len;
+ struct strlist *sp;
+
+ len = 0;
+ for (sp = str ; sp ; sp = sp->next)
+ len++;
+ return msort(str, len);
+}
+
+
+static struct strlist *
+msort(list, len)
+ struct strlist *list;
+ int len;
+{
+ struct strlist *p, *q = NULL;
+ struct strlist **lpp;
+ int half;
+ int n;
+
+ if (len <= 1)
+ return list;
+ half = len >> 1;
+ p = list;
+ for (n = half ; --n >= 0 ; ) {
+ q = p;
+ p = p->next;
+ }
+ q->next = NULL; /* terminate first half of list */
+ q = msort(list, half); /* sort first half of list */
+ p = msort(p, len - half); /* sort second half */
+ lpp = &list;
+ for (;;) {
+ if (strcmp(p->text, q->text) < 0) {
+ *lpp = p;
+ lpp = &p->next;
+ if ((p = *lpp) == NULL) {
+ *lpp = q;
+ break;
+ }
+ } else {
+ *lpp = q;
+ lpp = &q->next;
+ if ((q = *lpp) == NULL) {
+ *lpp = p;
+ break;
+ }
+ }
+ }
+ return list;
+}
+#endif
+
+
+
+/*
+ * Returns true if the pattern matches the string.
+ */
+
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN)
+static int
+patmatch(pattern, string, squoted)
+ char *pattern;
+ char *string;
+ int squoted; /* string might have quote chars */
+ {
+ const char *p;
+ char *q;
+
+ p = preglob(pattern);
+ q = squoted ? _rmescapes(string, RMESCAPE_ALLOC) : string;
+
+ return !fnmatch(p, q, 0);
+}
+
+
+static int
+patmatch2(pattern, string, squoted)
+ char *pattern;
+ char *string;
+ int squoted; /* string might have quote chars */
+ {
+ char *p;
+ int res;
+
+ sstrnleft--;
+ p = grabstackstr(expdest);
+ res = patmatch(pattern, string, squoted);
+ ungrabstackstr(p, expdest);
+ return res;
+}
+#else
+static int
+patmatch(pattern, string, squoted)
+ char *pattern;
+ char *string;
+ int squoted; /* string might have quote chars */
+ {
+#ifdef notdef
+ if (pattern[0] == '!' && pattern[1] == '!')
+ return 1 - pmatch(pattern + 2, string);
+ else
+#endif
+ return pmatch(pattern, string, squoted);
+}
+
+
+static int
+pmatch(pattern, string, squoted)
+ char *pattern;
+ char *string;
+ int squoted;
+ {
+ char *p, *q;
+ char c;
+
+ p = pattern;
+ q = string;
+ for (;;) {
+ switch (c = *p++) {
+ case '\0':
+ goto breakloop;
+ case CTLESC:
+ if (squoted && *q == CTLESC)
+ q++;
+ if (*q++ != *p++)
+ return 0;
+ break;
+ case CTLQUOTEMARK:
+ continue;
+ case '?':
+ if (squoted && *q == CTLESC)
+ q++;
+ if (*q++ == '\0')
+ return 0;
+ break;
+ case '*':
+ c = *p;
+ while (c == CTLQUOTEMARK || c == '*')
+ c = *++p;
+ if (c != CTLESC && c != CTLQUOTEMARK &&
+ c != '?' && c != '*' && c != '[') {
+ while (*q != c) {
+ if (squoted && *q == CTLESC &&
+ q[1] == c)
+ break;
+ if (*q == '\0')
+ return 0;
+ if (squoted && *q == CTLESC)
+ q++;
+ q++;
+ }
+ }
+ do {
+ if (pmatch(p, q, squoted))
+ return 1;
+ if (squoted && *q == CTLESC)
+ q++;
+ } while (*q++ != '\0');
+ return 0;
+ case '[': {
+ char *endp;
+ int invert, found;
+ char chr;
+
+ endp = p;
+ if (*endp == '!')
+ endp++;
+ for (;;) {
+ while (*endp == CTLQUOTEMARK)
+ endp++;
+ if (*endp == '\0')
+ goto dft; /* no matching ] */
+ if (*endp == CTLESC)
+ endp++;
+ if (*++endp == ']')
+ break;
+ }
+ invert = 0;
+ if (*p == '!') {
+ invert++;
+ p++;
+ }
+ found = 0;
+ chr = *q++;
+ if (squoted && chr == CTLESC)
+ chr = *q++;
+ if (chr == '\0')
+ return 0;
+ c = *p++;
+ do {
+ if (c == CTLQUOTEMARK)
+ continue;
+ if (c == CTLESC)
+ c = *p++;
+ if (*p == '-' && p[1] != ']') {
+ p++;
+ while (*p == CTLQUOTEMARK)
+ p++;
+ if (*p == CTLESC)
+ p++;
+ if (chr >= c && chr <= *p)
+ found = 1;
+ p++;
+ } else {
+ if (chr == c)
+ found = 1;
+ }
+ } while ((c = *p++) != ']');
+ if (found == invert)
+ return 0;
+ break;
+ }
+dft: default:
+ if (squoted && *q == CTLESC)
+ q++;
+ if (*q++ != c)
+ return 0;
+ break;
+ }
+ }
+breakloop:
+ if (*q != '\0')
+ return 0;
+ return 1;
+}
+#endif
+
+
+
+/*
+ * Remove any CTLESC characters from a string.
+ */
+
+#if defined(__GLIBC__) && !defined(FNMATCH_BROKEN)
+static char *
+_rmescapes(str, flag)
+ char *str;
+ int flag;
+{
+ char *p, *q, *r;
+ static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 };
+
+ p = strpbrk(str, qchars);
+ if (!p) {
+ return str;
+ }
+ q = p;
+ r = str;
+ if (flag & RMESCAPE_ALLOC) {
+ size_t len = p - str;
+ q = r = stalloc(strlen(p) + len + 1);
+ if (len > 0) {
+#ifdef _GNU_SOURCE
+ q = mempcpy(q, str, len);
+#else
+ memcpy(q, str, len);
+ q += len;
+#endif
+ }
+ }
+ while (*p) {
+ if (*p == CTLQUOTEMARK) {
+ p++;
+ continue;
+ }
+ if (*p == CTLESC) {
+ p++;
+ if (flag & RMESCAPE_GLOB && *p != '/') {
+ *q++ = '\\';
+ }
+ }
+ *q++ = *p++;
+ }
+ *q = '\0';
+ return r;
+}
+#else
+static void
+rmescapes(str)
+ char *str;
+{
+ char *p, *q;
+
+ p = str;
+ while (*p != CTLESC && *p != CTLQUOTEMARK) {
+ if (*p++ == '\0')
+ return;
+ }
+ q = p;
+ while (*p) {
+ if (*p == CTLQUOTEMARK) {
+ p++;
+ continue;
+ }
+ if (*p == CTLESC)
+ p++;
+ *q++ = *p++;
+ }
+ *q = '\0';
+}
+#endif
+
+
+
+/*
+ * See if a pattern matches in a case statement.
+ */
+
+static int
+casematch(pattern, val)
+ union node *pattern;
+ char *val;
+ {
+ struct stackmark smark;
+ int result;
+ char *p;
+
+ setstackmark(&smark);
+ argbackq = pattern->narg.backquote;
+ STARTSTACKSTR(expdest);
+ ifslastp = NULL;
+ argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
+ STPUTC('\0', expdest);
+ p = grabstackstr(expdest);
+ result = patmatch(p, val, 0);
+ popstackmark(&smark);
+ return result;
+}
+
+/*
+ * Our own itoa().
+ */
+
+static char *
+cvtnum(num, buf)
+ int num;
+ char *buf;
+ {
+ int len;
+
+ CHECKSTRSPACE(32, buf);
+ len = sprintf(buf, "%d", num);
+ STADJUST(len, buf);
+ return buf;
+}
+/* $NetBSD: histedit.c,v 1.25 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Editline and history functions (and glue).
+ */
+static int histcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ error("not compiled with history support");
+ /* NOTREACHED */
+}
+
+
+/*
+ * This file was generated by the mkinit program.
+ */
+
+extern void rmaliases __P((void));
+
+extern int loopnest; /* current loop nesting level */
+
+extern void deletefuncs __P((void));
+
+struct strpush {
+ struct strpush *prev; /* preceding string on stack */
+ char *prevstring;
+ int prevnleft;
+ struct alias *ap; /* if push was associated with an alias */
+ char *string; /* remember the string since it may change */
+};
+
+struct parsefile {
+ struct parsefile *prev; /* preceding file on stack */
+ int linno; /* current line */
+ int fd; /* file descriptor (or -1 if string) */
+ int nleft; /* number of chars left in this line */
+ int lleft; /* number of chars left in this buffer */
+ char *nextc; /* next char in buffer */
+ char *buf; /* input buffer */
+ struct strpush *strpush; /* for pushing strings at this level */
+ struct strpush basestrpush; /* so pushing one is fast */
+};
+
+extern int parselleft; /* copy of parsefile->lleft */
+extern struct parsefile basepf; /* top level input file */
+extern char basebuf[BUFSIZ]; /* buffer for top level input file */
+
+extern short backgndpid; /* pid of last background process */
+extern int jobctl;
+
+extern int tokpushback; /* last token pushed back */
+extern int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
+
+struct redirtab {
+ struct redirtab *next;
+ short renamed[10];
+};
+
+extern struct redirtab *redirlist;
+
+extern char sigmode[NSIG - 1]; /* current value of signal */
+
+extern char **environ;
+
+
+
+/*
+ * Initialization code.
+ */
+
+static void
+init() {
+
+ /* from cd.c: */
+ {
+ setpwd(0, 0);
+ }
+
+ /* from input.c: */
+ {
+ basepf.nextc = basepf.buf = basebuf;
+ }
+
+ /* from output.c: */
+ {
+#ifdef USE_GLIBC_STDIO
+ initstreams();
+#endif
+ }
+
+ /* from var.c: */
+ {
+ char **envp;
+ char ppid[32];
+
+ initvar();
+ for (envp = environ ; *envp ; envp++) {
+ if (strchr(*envp, '=')) {
+ setvareq(*envp, VEXPORT|VTEXTFIXED);
+ }
+ }
+
+ fmtstr(ppid, sizeof(ppid), "%d", (int) getppid());
+ setvar("PPID", ppid, 0);
+ }
+}
+
+
+
+/*
+ * This routine is called when an error or an interrupt occurs in an
+ * interactive shell and control is returned to the main command loop.
+ */
+
+static void
+reset() {
+
+ /* from eval.c: */
+ {
+ evalskip = 0;
+ loopnest = 0;
+ funcnest = 0;
+ }
+
+ /* from input.c: */
+ {
+ if (exception != EXSHELLPROC)
+ parselleft = parsenleft = 0; /* clear input buffer */
+ popallfiles();
+ }
+
+ /* from parser.c: */
+ {
+ tokpushback = 0;
+ checkkwd = 0;
+ checkalias = 0;
+ }
+
+ /* from redir.c: */
+ {
+ while (redirlist)
+ popredir();
+ }
+
+ /* from output.c: */
+ {
+ out1 = &output;
+ out2 = &errout;
+#ifdef USE_GLIBC_STDIO
+ if (memout.stream != NULL)
+ __closememout();
+#endif
+ if (memout.buf != NULL) {
+ ckfree(memout.buf);
+ memout.buf = NULL;
+ }
+ }
+}
+
+
+
+/*
+ * This routine is called to initialize the shell to run a shell procedure.
+ */
+
+static void
+initshellproc() {
+
+ /* from alias.c: */
+ {
+ rmaliases();
+ }
+
+ /* from eval.c: */
+ {
+ exitstatus = 0;
+ }
+
+ /* from exec.c: */
+ {
+ deletefuncs();
+ }
+
+ /* from jobs.c: */
+ {
+ backgndpid = -1;
+#if JOBS
+ jobctl = 0;
+#endif
+ }
+
+ /* from options.c: */
+ {
+ int i;
+
+ for (i = 0; i < NOPTS; i++)
+ optlist[i].val = 0;
+ optschanged();
+
+ }
+
+ /* from redir.c: */
+ {
+ clearredir();
+ }
+
+ /* from trap.c: */
+ {
+ char *sm;
+
+ clear_traps();
+ for (sm = sigmode ; sm < sigmode + NSIG - 1; sm++) {
+ if (*sm == S_IGN)
+ *sm = S_HARD_IGN;
+ }
+ }
+
+ /* from var.c: */
+ {
+ shprocvar();
+ }
+}
+/* $NetBSD: input.c,v 1.35 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * This file implements the input routines used by the parser.
+ */
+
+#ifdef BB_FEATURE_COMMAND_EDITING
+unsigned int shell_context;
+static const char * cmdedit_prompt;
+static inline void putprompt(const char *s) {
+ cmdedit_prompt = s;
+}
+#else
+static inline void putprompt(const char *s) {
+ out2str(s);
+}
+#endif
+
+#define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
+
+static int plinno = 1; /* input line number */
+static int parsenleft; /* copy of parsefile->nleft */
+static int parselleft; /* copy of parsefile->lleft */
+static char *parsenextc; /* copy of parsefile->nextc */
+struct parsefile basepf; /* top level input file */
+static char basebuf[BUFSIZ]; /* buffer for top level input file */
+struct parsefile *parsefile = &basepf; /* current input file */
+static int whichprompt; /* 1 == PS1, 2 == PS2 */
+
+static void pushfile __P((void));
+static int preadfd __P((void));
+
+#ifdef mkinit
+INCLUDE <stdio.h>
+INCLUDE "input.h"
+INCLUDE "error.h"
+
+INIT {
+ basepf.nextc = basepf.buf = basebuf;
+}
+
+RESET {
+ if (exception != EXSHELLPROC)
+ parselleft = parsenleft = 0; /* clear input buffer */
+ popallfiles();
+}
+#endif
+
+
+/*
+ * Read a line from the script.
+ */
+
+static char *
+pfgets(line, len)
+ char *line;
+ int len;
+{
+ char *p = line;
+ int nleft = len;
+ int c;
+
+ while (--nleft > 0) {
+ c = pgetc2();
+ if (c == PEOF) {
+ if (p == line)
+ return NULL;
+ break;
+ }
+ *p++ = c;
+ if (c == '\n')
+ break;
+ }
+ *p = '\0';
+ return line;
+}
+
+
+/*
+ * Read a character from the script, returning PEOF on end of file.
+ * Nul characters in the input are silently discarded.
+ */
+
+static int
+pgetc()
+{
+ return pgetc_macro();
+}
+
+
+/*
+ * Same as pgetc(), but ignores PEOA.
+ */
+
+static int
+pgetc2()
+{
+ int c;
+ do {
+ c = pgetc_macro();
+ } while (c == PEOA);
+ return c;
+}
+
+
+static int
+preadfd()
+{
+ int nr;
+ char *buf = parsefile->buf;
+ parsenextc = buf;
+
+retry:
+#ifdef BB_FEATURE_COMMAND_EDITING
+ {
+ if (parsefile->fd)
+ nr = read(parsefile->fd, buf, BUFSIZ - 1);
+ else {
+ do {
+ cmdedit_read_input((char*)cmdedit_prompt, buf);
+ nr = strlen(buf);
+ } while (nr <=0 || shell_context);
+ cmdedit_terminate();
+ }
+ }
+#else
+ nr = read(parsefile->fd, buf, BUFSIZ - 1);
+#endif
+
+ if (nr < 0) {
+ if (errno == EINTR)
+ goto retry;
+ if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
+ int flags = fcntl(0, F_GETFL, 0);
+ if (flags >= 0 && flags & O_NONBLOCK) {
+ flags &=~ O_NONBLOCK;
+ if (fcntl(0, F_SETFL, flags) >= 0) {
+ out2str("sh: turning off NDELAY mode\n");
+ goto retry;
+ }
+ }
+ }
+ }
+ return nr;
+}
+
+/*
+ * Refill the input buffer and return the next input character:
+ *
+ * 1) If a string was pushed back on the input, pop it;
+ * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
+ * from a string so we can't refill the buffer, return EOF.
+ * 3) If the is more stuff in this buffer, use it else call read to fill it.
+ * 4) Process input up to the next newline, deleting nul characters.
+ */
+
+static int
+preadbuffer()
+{
+ char *p, *q;
+ int more;
+ char savec;
+
+ while (parsefile->strpush) {
+ if (
+ parsenleft == -1 && parsefile->strpush->ap &&
+ parsenextc[-1] != ' ' && parsenextc[-1] != '\t'
+ ) {
+ return PEOA;
+ }
+ popstring();
+ if (--parsenleft >= 0)
+ return (*parsenextc++);
+ }
+ if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
+ return PEOF;
+ flushout(&output);
+#ifdef FLUSHERR
+ flushout(&errout);
+#endif
+
+again:
+ if (parselleft <= 0) {
+ if ((parselleft = preadfd()) <= 0) {
+ parselleft = parsenleft = EOF_NLEFT;
+ return PEOF;
+ }
+ }
+
+ q = p = parsenextc;
+
+ /* delete nul characters */
+ for (more = 1; more;) {
+ switch (*p) {
+ case '\0':
+ p++; /* Skip nul */
+ goto check;
+
+
+ case '\n':
+ parsenleft = q - parsenextc;
+ more = 0; /* Stop processing here */
+ break;
+ }
+
+ *q++ = *p++;
+check:
+ if (--parselleft <= 0 && more) {
+ parsenleft = q - parsenextc - 1;
+ if (parsenleft < 0)
+ goto again;
+ more = 0;
+ }
+ }
+
+ savec = *q;
+ *q = '\0';
+
+ if (vflag) {
+ out2str(parsenextc);
+#ifdef FLUSHERR
+ flushout(out2);
+#endif
+ }
+
+ *q = savec;
+
+ return *parsenextc++;
+}
+
+/*
+ * Undo the last call to pgetc. Only one character may be pushed back.
+ * PEOF may be pushed back.
+ */
+
+static void
+pungetc() {
+ parsenleft++;
+ parsenextc--;
+}
+
+/*
+ * Push a string back onto the input at this current parsefile level.
+ * We handle aliases this way.
+ */
+static void
+pushstring(s, len, ap)
+ char *s;
+ int len;
+ void *ap;
+ {
+ struct strpush *sp;
+
+ INTOFF;
+/*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
+ if (parsefile->strpush) {
+ sp = ckmalloc(sizeof (struct strpush));
+ sp->prev = parsefile->strpush;
+ parsefile->strpush = sp;
+ } else
+ sp = parsefile->strpush = &(parsefile->basestrpush);
+ sp->prevstring = parsenextc;
+ sp->prevnleft = parsenleft;
+ sp->ap = (struct alias *)ap;
+ if (ap) {
+ ((struct alias *)ap)->flag |= ALIASINUSE;
+ sp->string = s;
+ }
+ parsenextc = s;
+ parsenleft = len;
+ INTON;
+}
+
+static void
+popstring()
+{
+ struct strpush *sp = parsefile->strpush;
+
+ INTOFF;
+ if (sp->ap) {
+ if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
+ if (!checkalias) {
+ checkalias = 1;
+ }
+ }
+ if (sp->string != sp->ap->val) {
+ ckfree(sp->string);
+ }
+ sp->ap->flag &= ~ALIASINUSE;
+ if (sp->ap->flag & ALIASDEAD) {
+ unalias(sp->ap->name);
+ }
+ }
+ parsenextc = sp->prevstring;
+ parsenleft = sp->prevnleft;
+/*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
+ parsefile->strpush = sp->prev;
+ if (sp != &(parsefile->basestrpush))
+ ckfree(sp);
+ INTON;
+}
+
+/*
+ * Set the input to take input from a file. If push is set, push the
+ * old input onto the stack first.
+ */
+
+static void
+setinputfile(fname, push)
+ const char *fname;
+ int push;
+{
+ int fd;
+ int myfileno2;
+
+ INTOFF;
+ if ((fd = open(fname, O_RDONLY)) < 0)
+ error("Can't open %s", fname);
+ if (fd < 10) {
+ myfileno2 = dup_as_newfd(fd, 10);
+ close(fd);
+ if (myfileno2 < 0)
+ error("Out of file descriptors");
+ fd = myfileno2;
+ }
+ setinputfd(fd, push);
+ INTON;
+}
+
+
+/*
+ * Like setinputfile, but takes an open file descriptor. Call this with
+ * interrupts off.
+ */
+
+static void
+setinputfd(fd, push)
+ int fd, push;
+{
+ (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
+ if (push) {
+ pushfile();
+ parsefile->buf = 0;
+ } else {
+ closescript();
+ while (parsefile->strpush)
+ popstring();
+ }
+ parsefile->fd = fd;
+ if (parsefile->buf == NULL)
+ parsefile->buf = ckmalloc(BUFSIZ);
+ parselleft = parsenleft = 0;
+ plinno = 1;
+}
+
+
+/*
+ * Like setinputfile, but takes input from a string.
+ */
+
+static void
+setinputstring(string)
+ char *string;
+ {
+ INTOFF;
+ pushfile();
+ parsenextc = string;
+ parsenleft = strlen(string);
+ parsefile->buf = NULL;
+ plinno = 1;
+ INTON;
+}
+
+
+
+/*
+ * To handle the "." command, a stack of input files is used. Pushfile
+ * adds a new entry to the stack and popfile restores the previous level.
+ */
+
+static void
+pushfile() {
+ struct parsefile *pf;
+
+ parsefile->nleft = parsenleft;
+ parsefile->lleft = parselleft;
+ parsefile->nextc = parsenextc;
+ parsefile->linno = plinno;
+ pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
+ pf->prev = parsefile;
+ pf->fd = -1;
+ pf->strpush = NULL;
+ pf->basestrpush.prev = NULL;
+ parsefile = pf;
+}
+
+
+static void
+popfile() {
+ struct parsefile *pf = parsefile;
+
+ INTOFF;
+ if (pf->fd >= 0)
+ close(pf->fd);
+ if (pf->buf)
+ ckfree(pf->buf);
+ while (pf->strpush)
+ popstring();
+ parsefile = pf->prev;
+ ckfree(pf);
+ parsenleft = parsefile->nleft;
+ parselleft = parsefile->lleft;
+ parsenextc = parsefile->nextc;
+ plinno = parsefile->linno;
+ INTON;
+}
+
+
+/*
+ * Return to top level.
+ */
+
+static void
+popallfiles() {
+ while (parsefile != &basepf)
+ popfile();
+}
+
+
+
+/*
+ * Close the file(s) that the shell is reading commands from. Called
+ * after a fork is done.
+ */
+
+static void
+closescript() {
+ popallfiles();
+ if (parsefile->fd > 0) {
+ close(parsefile->fd);
+ parsefile->fd = 0;
+ }
+}
+/* $NetBSD: jobs.c,v 1.36 2000/05/22 10:18:47 elric Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+struct job *jobtab; /* array of jobs */
+static int njobs; /* size of array */
+short backgndpid = -1; /* pid of last background process */
+#if JOBS
+static int initialpgrp; /* pgrp of shell on invocation */
+short curjob; /* current job */
+#endif
+static int intreceived;
+
+static void restartjob __P((struct job *));
+static void freejob __P((struct job *));
+static struct job *getjob __P((char *));
+static int dowait __P((int, struct job *));
+#ifdef SYSV
+static int onsigchild __P((void));
+#endif
+static int waitproc __P((int, int *));
+static void cmdtxt __P((union node *));
+static void cmdputs __P((const char *));
+static void waitonint(int);
+
+
+#if JOBS
+/*
+ * Turn job control on and off.
+ *
+ * Note: This code assumes that the third arg to ioctl is a character
+ * pointer, which is true on Berkeley systems but not System V. Since
+ * System V doesn't have job control yet, this isn't a problem now.
+ */
+
+static int jobctl;
+
+static void setjobctl(int enable)
+{
+#ifdef OLD_TTY_DRIVER
+ int ldisc;
+#endif
+
+ if (enable == jobctl || rootshell == 0)
+ return;
+ if (enable) {
+ do { /* while we are in the background */
+#ifdef OLD_TTY_DRIVER
+ if (ioctl(fileno2, TIOCGPGRP, (char *)&initialpgrp) < 0) {
+#else
+ initialpgrp = tcgetpgrp(fileno2);
+ if (initialpgrp < 0) {
+#endif
+ out2str("sh: can't access tty; job cenabletrol turned off\n");
+ mflag = 0;
+ return;
+ }
+ if (initialpgrp == -1)
+ initialpgrp = getpgrp();
+ else if (initialpgrp != getpgrp()) {
+ killpg(initialpgrp, SIGTTIN);
+ continue;
+ }
+ } while (0);
+#ifdef OLD_TTY_DRIVER
+ if (ioctl(fileno2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) {
+ out2str("sh: need new tty driver to run job cenabletrol; job cenabletrol turned off\n");
+ mflag = 0;
+ return;
+ }
+#endif
+ setsignal(SIGTSTP);
+ setsignal(SIGTTOU);
+ setsignal(SIGTTIN);
+ setpgid(0, rootpid);
+#ifdef OLD_TTY_DRIVER
+ ioctl(fileno2, TIOCSPGRP, (char *)&rootpid);
+#else
+ tcsetpgrp(fileno2, rootpid);
+#endif
+ } else { /* turning job cenabletrol off */
+ setpgid(0, initialpgrp);
+#ifdef OLD_TTY_DRIVER
+ ioctl(fileno2, TIOCSPGRP, (char *)&initialpgrp);
+#else
+ tcsetpgrp(fileno2, initialpgrp);
+#endif
+ setsignal(SIGTSTP);
+ setsignal(SIGTTOU);
+ setsignal(SIGTTIN);
+ }
+ jobctl = enable;
+}
+#endif
+
+
+#ifdef mkinit
+INCLUDE <stdlib.h>
+
+SHELLPROC {
+ backgndpid = -1;
+#if JOBS
+ jobctl = 0;
+#endif
+}
+
+#endif
+
+
+/* This file was automatically created by ./mksignames.
+ Do not edit. Edit support/mksignames.c instead. */
+
+/* A translation list so we can be polite to our users. */
+static char *signal_names[NSIG + 2] = {
+ "EXIT",
+ "SIGHUP",
+ "SIGINT",
+ "SIGQUIT",
+ "SIGILL",
+ "SIGTRAP",
+ "SIGABRT",
+ "SIGBUS",
+ "SIGFPE",
+ "SIGKILL",
+ "SIGUSR1",
+ "SIGSEGV",
+ "SIGUSR2",
+ "SIGPIPE",
+ "SIGALRM",
+ "SIGTERM",
+ "SIGJUNK(16)",
+ "SIGCHLD",
+ "SIGCONT",
+ "SIGSTOP",
+ "SIGTSTP",
+ "SIGTTIN",
+ "SIGTTOU",
+ "SIGURG",
+ "SIGXCPU",
+ "SIGXFSZ",
+ "SIGVTALRM",
+ "SIGPROF",
+ "SIGWINCH",
+ "SIGIO",
+ "SIGPWR",
+ "SIGSYS",
+ "SIGRTMIN",
+ "SIGRTMIN+1",
+ "SIGRTMIN+2",
+ "SIGRTMIN+3",
+ "SIGRTMIN+4",
+ "SIGRTMIN+5",
+ "SIGRTMIN+6",
+ "SIGRTMIN+7",
+ "SIGRTMIN+8",
+ "SIGRTMIN+9",
+ "SIGRTMIN+10",
+ "SIGRTMIN+11",
+ "SIGRTMIN+12",
+ "SIGRTMIN+13",
+ "SIGRTMIN+14",
+ "SIGRTMIN+15",
+ "SIGRTMAX-15",
+ "SIGRTMAX-14",
+ "SIGRTMAX-13",
+ "SIGRTMAX-12",
+ "SIGRTMAX-11",
+ "SIGRTMAX-10",
+ "SIGRTMAX-9",
+ "SIGRTMAX-8",
+ "SIGRTMAX-7",
+ "SIGRTMAX-6",
+ "SIGRTMAX-5",
+ "SIGRTMAX-4",
+ "SIGRTMAX-3",
+ "SIGRTMAX-2",
+ "SIGRTMAX-1",
+ "SIGRTMAX",
+ "DEBUG",
+ (char *)0x0,
+};
+
+
+
+#if JOBS
+static int
+killcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int signo = -1;
+ int list = 0;
+ int i;
+ pid_t pid;
+ struct job *jp;
+
+ if (argc <= 1) {
+usage:
+ error(
+"Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n"
+"kill -l [exitstatus]"
+ );
+ }
+
+ if (*argv[1] == '-') {
+ signo = decode_signal(argv[1] + 1, 1);
+ if (signo < 0) {
+ int c;
+
+ while ((c = nextopt("ls:")) != '\0')
+ switch (c) {
+ case 'l':
+ list = 1;
+ break;
+ case 's':
+ signo = decode_signal(optionarg, 1);
+ if (signo < 0) {
+ error(
+ "invalid signal number or name: %s",
+ optionarg
+ );
+ }
+ break;
+#ifdef DEBUG
+ default:
+ error(
+ "nextopt returned character code 0%o", c);
+#endif
+ }
+ } else
+ argptr++;
+ }
+
+ if (!list && signo < 0)
+ signo = SIGTERM;
+
+ if ((signo < 0 || !*argptr) ^ list) {
+ goto usage;
+ }
+
+ if (list) {
+ if (!*argptr) {
+ out1str("0\n");
+ for (i = 1; i < NSIG; i++) {
+ out1fmt(snlfmt, signal_names[i] + 3);
+ }
+ return 0;
+ }
+ signo = atoi(*argptr);
+ if (signo > 128)
+ signo -= 128;
+ if (0 < signo && signo < NSIG)
+ out1fmt(snlfmt, signal_names[signo] + 3);
+ else
+ error("invalid signal number or exit status: %s",
+ *argptr);
+ return 0;
+ }
+
+ do {
+ if (**argptr == '%') {
+ jp = getjob(*argptr);
+ if (jp->jobctl == 0)
+ error("job %s not created under job control",
+ *argptr);
+ pid = -jp->ps[0].pid;
+ } else
+ pid = atoi(*argptr);
+ if (kill(pid, signo) != 0)
+ error("%s: %s", *argptr, strerror(errno));
+ } while (*++argptr);
+
+ return 0;
+}
+
+static int
+fgcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct job *jp;
+ int pgrp;
+ int status;
+
+ jp = getjob(argv[1]);
+ if (jp->jobctl == 0)
+ error("job not created under job control");
+ pgrp = jp->ps[0].pid;
+#ifdef OLD_TTY_DRIVER
+ ioctl(fileno2, TIOCSPGRP, (char *)&pgrp);
+#else
+ tcsetpgrp(fileno2, pgrp);
+#endif
+ restartjob(jp);
+ INTOFF;
+ status = waitforjob(jp);
+ INTON;
+ return status;
+}
+
+
+static int
+bgcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct job *jp;
+
+ do {
+ jp = getjob(*++argv);
+ if (jp->jobctl == 0)
+ error("job not created under job control");
+ restartjob(jp);
+ } while (--argc > 1);
+ return 0;
+}
+
+
+static void
+restartjob(jp)
+ struct job *jp;
+{
+ struct procstat *ps;
+ int i;
+
+ if (jp->state == JOBDONE)
+ return;
+ INTOFF;
+ killpg(jp->ps[0].pid, SIGCONT);
+ for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
+ if (WIFSTOPPED(ps->status)) {
+ ps->status = -1;
+ jp->state = 0;
+ }
+ }
+ INTON;
+}
+#endif
+
+
+static int
+jobscmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ showjobs(0);
+ return 0;
+}
+
+
+/*
+ * Print a list of jobs. If "change" is nonzero, only print jobs whose
+ * statuses have changed since the last call to showjobs.
+ *
+ * If the shell is interrupted in the process of creating a job, the
+ * result may be a job structure containing zero processes. Such structures
+ * will be freed here.
+ */
+
+static void
+showjobs(change)
+ int change;
+{
+ int jobno;
+ int procno;
+ int i;
+ struct job *jp;
+ struct procstat *ps;
+ int col;
+ char s[64];
+
+ TRACE(("showjobs(%d) called\n", change));
+ while (dowait(0, (struct job *)NULL) > 0);
+ for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
+ if (! jp->used)
+ continue;
+ if (jp->nprocs == 0) {
+ freejob(jp);
+ continue;
+ }
+ if (change && ! jp->changed)
+ continue;
+ procno = jp->nprocs;
+ for (ps = jp->ps ; ; ps++) { /* for each process */
+ if (ps == jp->ps)
+ fmtstr(s, 64, "[%d] %ld ", jobno,
+ (long)ps->pid);
+ else
+ fmtstr(s, 64, " %ld ",
+ (long)ps->pid);
+ out1str(s);
+ col = strlen(s);
+ s[0] = '\0';
+ if (ps->status == -1) {
+ /* don't print anything */
+ } else if (WIFEXITED(ps->status)) {
+ fmtstr(s, 64, "Exit %d",
+ WEXITSTATUS(ps->status));
+ } else {
+#if JOBS
+ if (WIFSTOPPED(ps->status))
+ i = WSTOPSIG(ps->status);
+ else /* WIFSIGNALED(ps->status) */
+#endif
+ i = WTERMSIG(ps->status);
+ if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F])
+ scopy(sys_siglist[i & 0x7F], s);
+ else
+ fmtstr(s, 64, "Signal %d", i & 0x7F);
+ if (WCOREDUMP(ps->status))
+ strcat(s, " (core dumped)");
+ }
+ out1str(s);
+ col += strlen(s);
+ out1fmt(
+ "%*c%s\n", 30 - col >= 0 ? 30 - col : 0, ' ',
+ ps->cmd
+ );
+ if (--procno <= 0)
+ break;
+ }
+ jp->changed = 0;
+ if (jp->state == JOBDONE) {
+ freejob(jp);
+ }
+ }
+}
+
+
+/*
+ * Mark a job structure as unused.
+ */
+
+static void
+freejob(jp)
+ struct job *jp;
+ {
+ struct procstat *ps;
+ int i;
+
+ INTOFF;
+ for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
+ if (ps->cmd != nullstr)
+ ckfree(ps->cmd);
+ }
+ if (jp->ps != &jp->ps0)
+ ckfree(jp->ps);
+ jp->used = 0;
+#if JOBS
+ if (curjob == jp - jobtab + 1)
+ curjob = 0;
+#endif
+ INTON;
+}
+
+
+
+static int
+waitcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct job *job;
+ int status, retval;
+ struct job *jp;
+
+ if (--argc > 0) {
+start:
+ job = getjob(*++argv);
+ } else {
+ job = NULL;
+ }
+ for (;;) { /* loop until process terminated or stopped */
+ if (job != NULL) {
+ if (job->state) {
+ status = job->ps[job->nprocs - 1].status;
+ if (! iflag)
+ freejob(job);
+ if (--argc) {
+ goto start;
+ }
+ if (WIFEXITED(status))
+ retval = WEXITSTATUS(status);
+#if JOBS
+ else if (WIFSTOPPED(status))
+ retval = WSTOPSIG(status) + 128;
+#endif
+ else {
+ /* XXX: limits number of signals */
+ retval = WTERMSIG(status) + 128;
+ }
+ return retval;
+ }
+ } else {
+ for (jp = jobtab ; ; jp++) {
+ if (jp >= jobtab + njobs) { /* no running procs */
+ return 0;
+ }
+ if (jp->used && jp->state == 0)
+ break;
+ }
+ }
+ if (dowait(2, 0) < 0 && errno == EINTR) {
+ return 129;
+ }
+ }
+}
+
+
+
+/*
+ * Convert a job name to a job structure.
+ */
+
+static struct job *
+getjob(name)
+ char *name;
+ {
+ int jobno;
+ struct job *jp;
+ int pid;
+ int i;
+
+ if (name == NULL) {
+#if JOBS
+currentjob:
+ if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0)
+ error("No current job");
+ return &jobtab[jobno - 1];
+#else
+ error("No current job");
+#endif
+ } else if (name[0] == '%') {
+ if (is_digit(name[1])) {
+ jobno = number(name + 1);
+ if (jobno > 0 && jobno <= njobs
+ && jobtab[jobno - 1].used != 0)
+ return &jobtab[jobno - 1];
+#if JOBS
+ } else if (name[1] == '%' && name[2] == '\0') {
+ goto currentjob;
+#endif
+ } else {
+ struct job *found = NULL;
+ for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
+ if (jp->used && jp->nprocs > 0
+ && prefix(name + 1, jp->ps[0].cmd)) {
+ if (found)
+ error("%s: ambiguous", name);
+ found = jp;
+ }
+ }
+ if (found)
+ return found;
+ }
+ } else if (is_number(name)) {
+ pid = number(name);
+ for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
+ if (jp->used && jp->nprocs > 0
+ && jp->ps[jp->nprocs - 1].pid == pid)
+ return jp;
+ }
+ }
+ error("No such job: %s", name);
+ /* NOTREACHED */
+}
+
+
+
+/*
+ * Return a new job structure,
+ */
+
+struct job *
+makejob(node, nprocs)
+ union node *node;
+ int nprocs;
+{
+ int i;
+ struct job *jp;
+
+ for (i = njobs, jp = jobtab ; ; jp++) {
+ if (--i < 0) {
+ INTOFF;
+ if (njobs == 0) {
+ jobtab = ckmalloc(4 * sizeof jobtab[0]);
+ } else {
+ jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
+ memcpy(jp, jobtab, njobs * sizeof jp[0]);
+ /* Relocate `ps' pointers */
+ for (i = 0; i < njobs; i++)
+ if (jp[i].ps == &jobtab[i].ps0)
+ jp[i].ps = &jp[i].ps0;
+ ckfree(jobtab);
+ jobtab = jp;
+ }
+ jp = jobtab + njobs;
+ for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
+ INTON;
+ break;
+ }
+ if (jp->used == 0)
+ break;
+ }
+ INTOFF;
+ jp->state = 0;
+ jp->used = 1;
+ jp->changed = 0;
+ jp->nprocs = 0;
+#if JOBS
+ jp->jobctl = jobctl;
+#endif
+ if (nprocs > 1) {
+ jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
+ } else {
+ jp->ps = &jp->ps0;
+ }
+ INTON;
+ TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
+ jp - jobtab + 1));
+ return jp;
+}
+
+
+/*
+ * Fork of a subshell. If we are doing job control, give the subshell its
+ * own process group. Jp is a job structure that the job is to be added to.
+ * N is the command that will be evaluated by the child. Both jp and n may
+ * be NULL. The mode parameter can be one of the following:
+ * FORK_FG - Fork off a foreground process.
+ * FORK_BG - Fork off a background process.
+ * FORK_NOJOB - Like FORK_FG, but don't give the process its own
+ * process group even if job control is on.
+ *
+ * When job control is turned off, background processes have their standard
+ * input redirected to /dev/null (except for the second and later processes
+ * in a pipeline).
+ */
+
+static int
+forkshell(jp, n, mode)
+ union node *n;
+ struct job *jp;
+ int mode;
+{
+ int pid;
+ int pgrp;
+ const char *devnull = _PATH_DEVNULL;
+ const char *nullerr = "Can't open %s";
+
+ TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n,
+ mode));
+ INTOFF;
+ pid = fork();
+ if (pid == -1) {
+ TRACE(("Fork failed, errno=%d\n", errno));
+ INTON;
+ error("Cannot fork");
+ }
+ if (pid == 0) {
+ struct job *p;
+ int wasroot;
+ int i;
+
+ TRACE(("Child shell %d\n", getpid()));
+ wasroot = rootshell;
+ rootshell = 0;
+ closescript();
+ INTON;
+ clear_traps();
+#if JOBS
+ jobctl = 0; /* do job control only in root shell */
+ if (wasroot && mode != FORK_NOJOB && mflag) {
+ if (jp == NULL || jp->nprocs == 0)
+ pgrp = getpid();
+ else
+ pgrp = jp->ps[0].pid;
+ setpgid(0, pgrp);
+ if (mode == FORK_FG) {
+ /*** this causes superfluous TIOCSPGRPS ***/
+#ifdef OLD_TTY_DRIVER
+ if (ioctl(fileno2, TIOCSPGRP, (char *)&pgrp) < 0)
+ error("TIOCSPGRP failed, errno=%d", errno);
+#else
+ if (tcsetpgrp(fileno2, pgrp) < 0)
+ error("tcsetpgrp failed, errno=%d", errno);
+#endif
+ }
+ setsignal(SIGTSTP);
+ setsignal(SIGTTOU);
+ } else if (mode == FORK_BG) {
+ ignoresig(SIGINT);
+ ignoresig(SIGQUIT);
+ if ((jp == NULL || jp->nprocs == 0) &&
+ ! fd0_redirected_p ()) {
+ close(0);
+ if (open(devnull, O_RDONLY) != 0)
+ error(nullerr, devnull);
+ }
+ }
+#else
+ if (mode == FORK_BG) {
+ ignoresig(SIGINT);
+ ignoresig(SIGQUIT);
+ if ((jp == NULL || jp->nprocs == 0) &&
+ ! fd0_redirected_p ()) {
+ close(0);
+ if (open(devnull, O_RDONLY) != 0)
+ error(nullerr, devnull);
+ }
+ }
+#endif
+ for (i = njobs, p = jobtab ; --i >= 0 ; p++)
+ if (p->used)
+ freejob(p);
+ if (wasroot && iflag) {
+ setsignal(SIGINT);
+ setsignal(SIGQUIT);
+ setsignal(SIGTERM);
+ }
+ return pid;
+ }
+ if (rootshell && mode != FORK_NOJOB && mflag) {
+ if (jp == NULL || jp->nprocs == 0)
+ pgrp = pid;
+ else
+ pgrp = jp->ps[0].pid;
+ setpgid(pid, pgrp);
+ }
+ if (mode == FORK_BG)
+ backgndpid = pid; /* set $! */
+ if (jp) {
+ struct procstat *ps = &jp->ps[jp->nprocs++];
+ ps->pid = pid;
+ ps->status = -1;
+ ps->cmd = nullstr;
+ if (iflag && rootshell && n)
+ ps->cmd = commandtext(n);
+ }
+ INTON;
+ TRACE(("In parent shell: child = %d\n", pid));
+ return pid;
+}
+
+
+
+/*
+ * Wait for job to finish.
+ *
+ * Under job control we have the problem that while a child process is
+ * running interrupts generated by the user are sent to the child but not
+ * to the shell. This means that an infinite loop started by an inter-
+ * active user may be hard to kill. With job control turned off, an
+ * interactive user may place an interactive program inside a loop. If
+ * the interactive program catches interrupts, the user doesn't want
+ * these interrupts to also abort the loop. The approach we take here
+ * is to have the shell ignore interrupt signals while waiting for a
+ * forground process to terminate, and then send itself an interrupt
+ * signal if the child process was terminated by an interrupt signal.
+ * Unfortunately, some programs want to do a bit of cleanup and then
+ * exit on interrupt; unless these processes terminate themselves by
+ * sending a signal to themselves (instead of calling exit) they will
+ * confuse this approach.
+ */
+
+static int
+waitforjob(jp)
+ struct job *jp;
+ {
+#if JOBS
+ int mypgrp = getpgrp();
+#endif
+ int status;
+ int st;
+ struct sigaction act, oact;
+
+ INTOFF;
+ intreceived = 0;
+#if JOBS
+ if (!jobctl) {
+#else
+ if (!iflag) {
+#endif
+ sigaction(SIGINT, 0, &act);
+ act.sa_handler = waitonint;
+ sigaction(SIGINT, &act, &oact);
+ }
+ TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
+ while (jp->state == 0) {
+ dowait(1, jp);
+ }
+#if JOBS
+ if (!jobctl) {
+#else
+ if (!iflag) {
+#endif
+ sigaction(SIGINT, &oact, 0);
+ if (intreceived && trap[SIGINT]) kill(getpid(), SIGINT);
+ }
+#if JOBS
+ if (jp->jobctl) {
+#ifdef OLD_TTY_DRIVER
+ if (ioctl(fileno2, TIOCSPGRP, (char *)&mypgrp) < 0)
+ error("TIOCSPGRP failed, errno=%d\n", errno);
+#else
+ if (tcsetpgrp(fileno2, mypgrp) < 0)
+ error("tcsetpgrp failed, errno=%d\n", errno);
+#endif
+ }
+ if (jp->state == JOBSTOPPED)
+ curjob = jp - jobtab + 1;
+#endif
+ status = jp->ps[jp->nprocs - 1].status;
+ /* convert to 8 bits */
+ if (WIFEXITED(status))
+ st = WEXITSTATUS(status);
+#if JOBS
+ else if (WIFSTOPPED(status))
+ st = WSTOPSIG(status) + 128;
+#endif
+ else
+ st = WTERMSIG(status) + 128;
+#if JOBS
+ if (jp->jobctl) {
+ /*
+ * This is truly gross.
+ * If we're doing job control, then we did a TIOCSPGRP which
+ * caused us (the shell) to no longer be in the controlling
+ * session -- so we wouldn't have seen any ^C/SIGINT. So, we
+ * intuit from the subprocess exit status whether a SIGINT
+ * occured, and if so interrupt ourselves. Yuck. - mycroft
+ */
+ if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
+ raise(SIGINT);
+ }
+#endif
+ if (! JOBS || jp->state == JOBDONE)
+ freejob(jp);
+ INTON;
+ return st;
+}
+
+
+
+/*
+ * Wait for a process to terminate.
+ */
+
+static int
+dowait(block, job)
+ int block;
+ struct job *job;
+{
+ int pid;
+ int status;
+ struct procstat *sp;
+ struct job *jp;
+ struct job *thisjob;
+ int done;
+ int stopped;
+ int core;
+ int sig;
+
+ TRACE(("dowait(%d) called\n", block));
+ do {
+ pid = waitproc(block, &status);
+ TRACE(("wait returns %d, status=%d\n", pid, status));
+ } while (!(block & 2) && pid == -1 && errno == EINTR);
+ if (pid <= 0)
+ return pid;
+ INTOFF;
+ thisjob = NULL;
+ for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
+ if (jp->used) {
+ done = 1;
+ stopped = 1;
+ for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
+ if (sp->pid == -1)
+ continue;
+ if (sp->pid == pid) {
+ TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status));
+ sp->status = status;
+ thisjob = jp;
+ }
+ if (sp->status == -1)
+ stopped = 0;
+ else if (WIFSTOPPED(sp->status))
+ done = 0;
+ }
+ if (stopped) { /* stopped or done */
+ int state = done? JOBDONE : JOBSTOPPED;
+ if (jp->state != state) {
+ TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
+ jp->state = state;
+#if JOBS
+ if (done && curjob == jp - jobtab + 1)
+ curjob = 0; /* no current job */
+#endif
+ }
+ }
+ }
+ }
+ INTON;
+ if (! rootshell || ! iflag || (job && thisjob == job)) {
+ core = WCOREDUMP(status);
+#if JOBS
+ if (WIFSTOPPED(status)) sig = WSTOPSIG(status);
+ else
+#endif
+ if (WIFEXITED(status)) sig = 0;
+ else sig = WTERMSIG(status);
+
+ if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
+ if (thisjob != job)
+ outfmt(out2, "%d: ", pid);
+#if JOBS
+ if (sig == SIGTSTP && rootshell && iflag)
+ outfmt(out2, "%%%ld ",
+ (long)(job - jobtab + 1));
+#endif
+ if (sig < NSIG && sys_siglist[sig])
+ out2str(sys_siglist[sig]);
+ else
+ outfmt(out2, "Signal %d", sig);
+ if (core)
+ out2str(" - core dumped");
+ out2c('\n');
+#ifdef FLUSHERR
+ flushout(&errout);
+#endif
+ } else {
+ TRACE(("Not printing status: status=%d, sig=%d\n",
+ status, sig));
+ }
+ } else {
+ TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job));
+ if (thisjob)
+ thisjob->changed = 1;
+ }
+ return pid;
+}
+
+
+
+/*
+ * Do a wait system call. If job control is compiled in, we accept
+ * stopped processes. If block is zero, we return a value of zero
+ * rather than blocking.
+ *
+ * System V doesn't have a non-blocking wait system call. It does
+ * have a SIGCLD signal that is sent to a process when one of it's
+ * children dies. The obvious way to use SIGCLD would be to install
+ * a handler for SIGCLD which simply bumped a counter when a SIGCLD
+ * was received, and have waitproc bump another counter when it got
+ * the status of a process. Waitproc would then know that a wait
+ * system call would not block if the two counters were different.
+ * This approach doesn't work because if a process has children that
+ * have not been waited for, System V will send it a SIGCLD when it
+ * installs a signal handler for SIGCLD. What this means is that when
+ * a child exits, the shell will be sent SIGCLD signals continuously
+ * until is runs out of stack space, unless it does a wait call before
+ * restoring the signal handler. The code below takes advantage of
+ * this (mis)feature by installing a signal handler for SIGCLD and
+ * then checking to see whether it was called. If there are any
+ * children to be waited for, it will be.
+ *
+ * If neither SYSV nor BSD is defined, we don't implement nonblocking
+ * waits at all. In this case, the user will not be informed when
+ * a background process until the next time she runs a real program
+ * (as opposed to running a builtin command or just typing return),
+ * and the jobs command may give out of date information.
+ */
+
+#ifdef SYSV
+static int gotsigchild;
+
+static int onsigchild() {
+ gotsigchild = 1;
+}
+#endif
+
+
+static int
+waitproc(block, status)
+ int block;
+ int *status;
+{
+#ifdef BSD
+ int flags;
+
+ flags = 0;
+#if JOBS
+ if (jobctl)
+ flags |= WUNTRACED;
+#endif
+ if (block == 0)
+ flags |= WNOHANG;
+ return wait3(status, flags, (struct rusage *)NULL);
+#else
+#ifdef SYSV
+ int (*save)();
+
+ if (block == 0) {
+ gotsigchild = 0;
+ save = signal(SIGCLD, onsigchild);
+ signal(SIGCLD, save);
+ if (gotsigchild == 0)
+ return 0;
+ }
+ return wait(status);
+#else
+ if (block == 0)
+ return 0;
+ return wait(status);
+#endif
+#endif
+}
+
+/*
+ * return 1 if there are stopped jobs, otherwise 0
+ */
+static int job_warning = 0;
+static int
+stoppedjobs()
+{
+ int jobno;
+ struct job *jp;
+
+ if (job_warning)
+ return (0);
+ for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
+ if (jp->used == 0)
+ continue;
+ if (jp->state == JOBSTOPPED) {
+ out2str("You have stopped jobs.\n");
+ job_warning = 2;
+ return (1);
+ }
+ }
+
+ return (0);
+}
+
+/*
+ * Return a string identifying a command (to be printed by the
+ * jobs command.
+ */
+
+static char *cmdnextc;
+static int cmdnleft;
+#define MAXCMDTEXT 200
+
+static char *
+commandtext(n)
+ union node *n;
+ {
+ char *name;
+
+ cmdnextc = name = ckmalloc(MAXCMDTEXT);
+ cmdnleft = MAXCMDTEXT - 4;
+ cmdtxt(n);
+ *cmdnextc = '\0';
+ return name;
+}
+
+
+static void
+cmdtxt(n)
+ union node *n;
+ {
+ union node *np;
+ struct nodelist *lp;
+ const char *p;
+ int i;
+ char s[2];
+
+ if (n == NULL)
+ return;
+ switch (n->type) {
+ case NSEMI:
+ cmdtxt(n->nbinary.ch1);
+ cmdputs("; ");
+ cmdtxt(n->nbinary.ch2);
+ break;
+ case NAND:
+ cmdtxt(n->nbinary.ch1);
+ cmdputs(" && ");
+ cmdtxt(n->nbinary.ch2);
+ break;
+ case NOR:
+ cmdtxt(n->nbinary.ch1);
+ cmdputs(" || ");
+ cmdtxt(n->nbinary.ch2);
+ break;
+ case NPIPE:
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
+ cmdtxt(lp->n);
+ if (lp->next)
+ cmdputs(" | ");
+ }
+ break;
+ case NSUBSHELL:
+ cmdputs("(");
+ cmdtxt(n->nredir.n);
+ cmdputs(")");
+ break;
+ case NREDIR:
+ case NBACKGND:
+ cmdtxt(n->nredir.n);
+ break;
+ case NIF:
+ cmdputs("if ");
+ cmdtxt(n->nif.test);
+ cmdputs("; then ");
+ cmdtxt(n->nif.ifpart);
+ cmdputs("...");
+ break;
+ case NWHILE:
+ cmdputs("while ");
+ goto until;
+ case NUNTIL:
+ cmdputs("until ");
+until:
+ cmdtxt(n->nbinary.ch1);
+ cmdputs("; do ");
+ cmdtxt(n->nbinary.ch2);
+ cmdputs("; done");
+ break;
+ case NFOR:
+ cmdputs("for ");
+ cmdputs(n->nfor.var);
+ cmdputs(" in ...");
+ break;
+ case NCASE:
+ cmdputs("case ");
+ cmdputs(n->ncase.expr->narg.text);
+ cmdputs(" in ...");
+ break;
+ case NDEFUN:
+ cmdputs(n->narg.text);
+ cmdputs("() ...");
+ break;
+ case NCMD:
+ for (np = n->ncmd.args ; np ; np = np->narg.next) {
+ cmdtxt(np);
+ if (np->narg.next)
+ cmdputs(spcstr);
+ }
+ for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
+ cmdputs(spcstr);
+ cmdtxt(np);
+ }
+ break;
+ case NARG:
+ cmdputs(n->narg.text);
+ break;
+ case NTO:
+ p = ">"; i = 1; goto redir;
+ case NAPPEND:
+ p = ">>"; i = 1; goto redir;
+ case NTOFD:
+ p = ">&"; i = 1; goto redir;
+ case NTOOV:
+ p = ">|"; i = 1; goto redir;
+ case NFROM:
+ p = "<"; i = 0; goto redir;
+ case NFROMFD:
+ p = "<&"; i = 0; goto redir;
+ case NFROMTO:
+ p = "<>"; i = 0; goto redir;
+redir:
+ if (n->nfile.fd != i) {
+ s[0] = n->nfile.fd + '0';
+ s[1] = '\0';
+ cmdputs(s);
+ }
+ cmdputs(p);
+ if (n->type == NTOFD || n->type == NFROMFD) {
+ s[0] = n->ndup.dupfd + '0';
+ s[1] = '\0';
+ cmdputs(s);
+ } else {
+ cmdtxt(n->nfile.fname);
+ }
+ break;
+ case NHERE:
+ case NXHERE:
+ cmdputs("<<...");
+ break;
+ default:
+ cmdputs("???");
+ break;
+ }
+}
+
+
+
+static void
+cmdputs(s)
+ const char *s;
+ {
+ const char *p;
+ char *q;
+ char c;
+ int subtype = 0;
+
+ if (cmdnleft <= 0)
+ return;
+ p = s;
+ q = cmdnextc;
+ while ((c = *p++) != '\0') {
+ if (c == CTLESC)
+ *q++ = *p++;
+ else if (c == CTLVAR) {
+ *q++ = '$';
+ if (--cmdnleft > 0)
+ *q++ = '{';
+ subtype = *p++;
+ } else if (c == '=' && subtype != 0) {
+ *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
+ subtype = 0;
+ } else if (c == CTLENDVAR) {
+ *q++ = '}';
+ } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE)
+ cmdnleft++; /* ignore it */
+ else
+ *q++ = c;
+ if (--cmdnleft <= 0) {
+ *q++ = '.';
+ *q++ = '.';
+ *q++ = '.';
+ break;
+ }
+ }
+ cmdnextc = q;
+}
+
+static void waitonint(int sig) {
+ intreceived = 1;
+ return;
+}
+/* $NetBSD: mail.c,v 1.14 2000/07/03 03:26:19 matt Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Routines to check for mail. (Perhaps make part of main.c?)
+ */
+
+
+#define MAXMBOXES 10
+
+
+static int nmboxes; /* number of mailboxes */
+static time_t mailtime[MAXMBOXES]; /* times of mailboxes */
+
+
+
+/*
+ * Print appropriate message(s) if mail has arrived. If the argument is
+ * nozero, then the value of MAIL has changed, so we just update the
+ * values.
+ */
+
+static void
+chkmail(silent)
+ int silent;
+{
+ int i;
+ const char *mpath;
+ char *p;
+ char *q;
+ struct stackmark smark;
+ struct stat statb;
+
+ if (silent)
+ nmboxes = 10;
+ if (nmboxes == 0)
+ return;
+ setstackmark(&smark);
+ mpath = mpathset()? mpathval() : mailval();
+ for (i = 0 ; i < nmboxes ; i++) {
+ p = padvance(&mpath, nullstr);
+ if (p == NULL)
+ break;
+ if (*p == '\0')
+ continue;
+ for (q = p ; *q ; q++);
+#ifdef DEBUG
+ if (q[-1] != '/')
+ abort();
+#endif
+ q[-1] = '\0'; /* delete trailing '/' */
+#ifdef notdef /* this is what the System V shell claims to do (it lies) */
+ if (stat(p, &statb) < 0)
+ statb.st_mtime = 0;
+ if (statb.st_mtime > mailtime[i] && ! silent) {
+ outfmt(
+ &errout, snlfmt,
+ pathopt? pathopt : "you have mail"
+ );
+ }
+ mailtime[i] = statb.st_mtime;
+#else /* this is what it should do */
+ if (stat(p, &statb) < 0)
+ statb.st_size = 0;
+ if (statb.st_size > mailtime[i] && ! silent) {
+ outfmt(
+ &errout, snlfmt,
+ pathopt? pathopt : "you have mail"
+ );
+ }
+ mailtime[i] = statb.st_size;
+#endif
+ }
+ nmboxes = i;
+ popstackmark(&smark);
+}
+/* $NetBSD: main.c,v 1.40 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#define PROFILE 0
+
+static int rootpid;
+static int rootshell;
+#if PROFILE
+short profile_buf[16384];
+extern int etext();
+#endif
+
+static void read_profile __P((const char *));
+static char *find_dot_file __P((char *));
+int shell_main __P((int, char **));
+
+extern int oexitstatus;
+/*
+ * Main routine. We initialize things, parse the arguments, execute
+ * profiles if we're a login shell, and then call cmdloop to execute
+ * commands. The setjmp call sets up the location to jump to when an
+ * exception occurs. When an exception occurs the variable "state"
+ * is used to figure out how far we had gotten.
+ */
+
+int
+shell_main(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct jmploc jmploc;
+ struct stackmark smark;
+ volatile int state;
+ char *shinit;
+
+ DOTCMD = find_builtin(".");
+ BLTINCMD = find_builtin("builtin");
+ COMMANDCMD = find_builtin("command");
+ EXECCMD = find_builtin("exec");
+ EVALCMD = find_builtin("eval");
+
+#if PROFILE
+ monitor(4, etext, profile_buf, sizeof profile_buf, 50);
+#endif
+#if defined(linux) || defined(__GNU__)
+ signal(SIGCHLD, SIG_DFL);
+#endif
+ state = 0;
+ if (setjmp(jmploc.loc)) {
+ INTOFF;
+ /*
+ * When a shell procedure is executed, we raise the
+ * exception EXSHELLPROC to clean up before executing
+ * the shell procedure.
+ */
+ switch (exception) {
+ case EXSHELLPROC:
+ rootpid = getpid();
+ rootshell = 1;
+ minusc = NULL;
+ state = 3;
+ break;
+
+ case EXEXEC:
+ exitstatus = exerrno;
+ break;
+
+ case EXERROR:
+ exitstatus = 2;
+ break;
+
+ default:
+ break;
+ }
+
+ if (exception != EXSHELLPROC) {
+ if (state == 0 || iflag == 0 || ! rootshell)
+ exitshell(exitstatus);
+ }
+ reset();
+ if (exception == EXINT
+#if ATTY
+ && (! attyset() || equal(termval(), "emacs"))
+#endif
+ ) {
+ out2c('\n');
+#ifdef FLUSHERR
+ flushout(out2);
+#endif
+ }
+ popstackmark(&smark);
+ FORCEINTON; /* enable interrupts */
+ if (state == 1)
+ goto state1;
+ else if (state == 2)
+ goto state2;
+ else if (state == 3)
+ goto state3;
+ else
+ goto state4;
+ }
+ handler = &jmploc;
+#ifdef DEBUG
+ opentrace();
+ trputs("Shell args: "); trargs(argv);
+#endif
+ rootpid = getpid();
+ rootshell = 1;
+ init();
+ setstackmark(&smark);
+ procargs(argc, argv);
+ if (argv[0] && argv[0][0] == '-') {
+ state = 1;
+ read_profile("/etc/profile");
+state1:
+ state = 2;
+ read_profile(".profile");
+ }
+state2:
+ state = 3;
+#ifndef linux
+ if (getuid() == geteuid() && getgid() == getegid()) {
+#endif
+ if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
+ state = 3;
+ read_profile(shinit);
+ }
+#ifndef linux
+ }
+#endif
+state3:
+ state = 4;
+ if (sflag == 0 || minusc) {
+ static int sigs[] = {
+ SIGINT, SIGQUIT, SIGHUP,
+#ifdef SIGTSTP
+ SIGTSTP,
+#endif
+ SIGPIPE
+ };
+#define SIGSSIZE (sizeof(sigs)/sizeof(sigs[0]))
+ int i;
+
+ for (i = 0; i < SIGSSIZE; i++)
+ setsignal(sigs[i]);
+ }
+
+ if (minusc)
+ evalstring(minusc, 0);
+
+ if (sflag || minusc == NULL) {
+state4: /* XXX ??? - why isn't this before the "if" statement */
+ cmdloop(1);
+ }
+#if PROFILE
+ monitor(0);
+#endif
+ exitshell(exitstatus);
+ /* NOTREACHED */
+}
+
+
+/*
+ * Read and execute commands. "Top" is nonzero for the top level command
+ * loop; it turns on prompting if the shell is interactive.
+ */
+
+static void
+cmdloop(top)
+ int top;
+{
+ union node *n;
+ struct stackmark smark;
+ int inter;
+ int numeof = 0;
+
+ TRACE(("cmdloop(%d) called\n", top));
+ setstackmark(&smark);
+ for (;;) {
+ if (pendingsigs)
+ dotrap();
+ inter = 0;
+ if (iflag && top) {
+ inter++;
+ showjobs(1);
+ chkmail(0);
+ flushout(&output);
+ }
+ n = parsecmd(inter);
+ /* showtree(n); DEBUG */
+ if (n == NEOF) {
+ if (!top || numeof >= 50)
+ break;
+ if (!stoppedjobs()) {
+ if (!Iflag)
+ break;
+ out2str("\nUse \"exit\" to leave shell.\n");
+ }
+ numeof++;
+ } else if (n != NULL && nflag == 0) {
+ job_warning = (job_warning == 2) ? 1 : 0;
+ numeof = 0;
+ evaltree(n, 0);
+ }
+ popstackmark(&smark);
+ setstackmark(&smark);
+ if (evalskip == SKIPFILE) {
+ evalskip = 0;
+ break;
+ }
+ }
+ popstackmark(&smark);
+}
+
+
+
+/*
+ * Read /etc/profile or .profile. Return on error.
+ */
+
+static void
+read_profile(name)
+ const char *name;
+{
+ int fd;
+ int xflag_set = 0;
+ int vflag_set = 0;
+
+ INTOFF;
+ if ((fd = open(name, O_RDONLY)) >= 0)
+ setinputfd(fd, 1);
+ INTON;
+ if (fd < 0)
+ return;
+ /* -q turns off -x and -v just when executing init files */
+ if (qflag) {
+ if (xflag)
+ xflag = 0, xflag_set = 1;
+ if (vflag)
+ vflag = 0, vflag_set = 1;
+ }
+ cmdloop(0);
+ if (qflag) {
+ if (xflag_set)
+ xflag = 1;
+ if (vflag_set)
+ vflag = 1;
+ }
+ popfile();
+}
+
+
+
+/*
+ * Read a file containing shell functions.
+ */
+
+static void
+readcmdfile(name)
+ char *name;
+{
+ int fd;
+
+ INTOFF;
+ if ((fd = open(name, O_RDONLY)) >= 0)
+ setinputfd(fd, 1);
+ else
+ error("Can't open %s", name);
+ INTON;
+ cmdloop(0);
+ popfile();
+}
+
+
+
+/*
+ * Take commands from a file. To be compatable we should do a path
+ * search for the file, which is necessary to find sub-commands.
+ */
+
+
+static char *
+find_dot_file(mybasename)
+ char *mybasename;
+{
+ char *fullname;
+ const char *path = pathval();
+ struct stat statb;
+
+ /* don't try this for absolute or relative paths */
+ if (strchr(mybasename, '/'))
+ return mybasename;
+
+ while ((fullname = padvance(&path, mybasename)) != NULL) {
+ if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
+ /*
+ * Don't bother freeing here, since it will
+ * be freed by the caller.
+ */
+ return fullname;
+ }
+ stunalloc(fullname);
+ }
+
+ /* not found in the PATH */
+ error("%s: not found", mybasename);
+ /* NOTREACHED */
+}
+
+static int
+dotcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct strlist *sp;
+ exitstatus = 0;
+
+ for (sp = cmdenviron; sp ; sp = sp->next)
+ setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED);
+
+ if (argc >= 2) { /* That's what SVR2 does */
+ char *fullname;
+ struct stackmark smark;
+
+ setstackmark(&smark);
+ fullname = find_dot_file(argv[1]);
+ setinputfile(fullname, 1);
+ commandname = fullname;
+ cmdloop(0);
+ popfile();
+ popstackmark(&smark);
+ }
+ return exitstatus;
+}
+
+
+static int
+exitcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ if (stoppedjobs())
+ return 0;
+ if (argc > 1)
+ exitstatus = number(argv[1]);
+ else
+ exitstatus = oexitstatus;
+ exitshell(exitstatus);
+ /* NOTREACHED */
+}
+/* $NetBSD: memalloc.c,v 1.23 2000/11/01 19:56:01 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+/*
+ * Parse trees for commands are allocated in lifo order, so we use a stack
+ * to make this more efficient, and also to avoid all sorts of exception
+ * handling code to handle interrupts in the middle of a parse.
+ *
+ * The size 504 was chosen because the Ultrix malloc handles that size
+ * well.
+ */
+
+#define MINSIZE 504 /* minimum size of a block */
+
+
+struct stack_block {
+ struct stack_block *prev;
+ char space[MINSIZE];
+};
+
+struct stack_block stackbase;
+struct stack_block *stackp = &stackbase;
+struct stackmark *markp;
+static char *stacknxt = stackbase.space;
+static int stacknleft = MINSIZE;
+static int sstrnleft;
+static int herefd = -1;
+
+
+
+pointer
+stalloc(nbytes)
+ int nbytes;
+{
+ char *p;
+
+ nbytes = ALIGN(nbytes);
+ if (nbytes > stacknleft) {
+ int blocksize;
+ struct stack_block *sp;
+
+ blocksize = nbytes;
+ if (blocksize < MINSIZE)
+ blocksize = MINSIZE;
+ INTOFF;
+ sp = ckmalloc(sizeof(struct stack_block) - MINSIZE + blocksize);
+ sp->prev = stackp;
+ stacknxt = sp->space;
+ stacknleft = blocksize;
+ stackp = sp;
+ INTON;
+ }
+ p = stacknxt;
+ stacknxt += nbytes;
+ stacknleft -= nbytes;
+ return p;
+}
+
+
+static void
+stunalloc(p)
+ pointer p;
+ {
+#ifdef DEBUG
+ if (p == NULL) { /*DEBUG */
+ write(2, "stunalloc\n", 10);
+ abort();
+ }
+#endif
+ if (!(stacknxt >= (char *)p && (char *)p >= stackp->space)) {
+ p = stackp->space;
+ }
+ stacknleft += stacknxt - (char *)p;
+ stacknxt = p;
+}
+
+
+
+static void
+setstackmark(mark)
+ struct stackmark *mark;
+ {
+ mark->stackp = stackp;
+ mark->stacknxt = stacknxt;
+ mark->stacknleft = stacknleft;
+ mark->marknext = markp;
+ markp = mark;
+}
+
+
+static void
+popstackmark(mark)
+ struct stackmark *mark;
+ {
+ struct stack_block *sp;
+
+ INTOFF;
+ markp = mark->marknext;
+ while (stackp != mark->stackp) {
+ sp = stackp;
+ stackp = sp->prev;
+ ckfree(sp);
+ }
+ stacknxt = mark->stacknxt;
+ stacknleft = mark->stacknleft;
+ INTON;
+}
+
+
+/*
+ * When the parser reads in a string, it wants to stick the string on the
+ * stack and only adjust the stack pointer when it knows how big the
+ * string is. Stackblock (defined in stack.h) returns a pointer to a block
+ * of space on top of the stack and stackblocklen returns the length of
+ * this block. Growstackblock will grow this space by at least one byte,
+ * possibly moving it (like realloc). Grabstackblock actually allocates the
+ * part of the block that has been used.
+ */
+
+static void
+growstackblock() {
+ char *p;
+ int newlen = ALIGN(stacknleft * 2 + 100);
+ char *oldspace = stacknxt;
+ int oldlen = stacknleft;
+ struct stack_block *sp;
+ struct stack_block *oldstackp;
+
+ if (stacknxt == stackp->space && stackp != &stackbase) {
+ INTOFF;
+ oldstackp = stackp;
+ sp = stackp;
+ stackp = sp->prev;
+ sp = ckrealloc((pointer)sp, sizeof(struct stack_block) - MINSIZE + newlen);
+ sp->prev = stackp;
+ stackp = sp;
+ stacknxt = sp->space;
+ stacknleft = newlen;
+ {
+ /* Stack marks pointing to the start of the old block
+ * must be relocated to point to the new block
+ */
+ struct stackmark *xmark;
+ xmark = markp;
+ while (xmark != NULL && xmark->stackp == oldstackp) {
+ xmark->stackp = stackp;
+ xmark->stacknxt = stacknxt;
+ xmark->stacknleft = stacknleft;
+ xmark = xmark->marknext;
+ }
+ }
+ INTON;
+ } else {
+ p = stalloc(newlen);
+ memcpy(p, oldspace, oldlen);
+ stacknxt = p; /* free the space */
+ stacknleft += newlen; /* we just allocated */
+ }
+}
+
+
+
+static void
+grabstackblock(len)
+ int len;
+{
+ len = ALIGN(len);
+ stacknxt += len;
+ stacknleft -= len;
+}
+
+
+
+/*
+ * The following routines are somewhat easier to use that the above.
+ * The user declares a variable of type STACKSTR, which may be declared
+ * to be a register. The macro STARTSTACKSTR initializes things. Then
+ * the user uses the macro STPUTC to add characters to the string. In
+ * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
+ * grown as necessary. When the user is done, she can just leave the
+ * string there and refer to it using stackblock(). Or she can allocate
+ * the space for it using grabstackstr(). If it is necessary to allow
+ * someone else to use the stack temporarily and then continue to grow
+ * the string, the user should use grabstack to allocate the space, and
+ * then call ungrabstr(p) to return to the previous mode of operation.
+ *
+ * USTPUTC is like STPUTC except that it doesn't check for overflow.
+ * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
+ * is space for at least one character.
+ */
+
+
+static char *
+growstackstr() {
+ int len = stackblocksize();
+ if (herefd >= 0 && len >= 1024) {
+ xwrite(herefd, stackblock(), len);
+ sstrnleft = len - 1;
+ return stackblock();
+ }
+ growstackblock();
+ sstrnleft = stackblocksize() - len - 1;
+ return stackblock() + len;
+}
+
+
+/*
+ * Called from CHECKSTRSPACE.
+ */
+
+static char *
+makestrspace(size_t newlen) {
+ int len = stackblocksize() - sstrnleft;
+ do {
+ growstackblock();
+ sstrnleft = stackblocksize() - len;
+ } while (sstrnleft < newlen);
+ return stackblock() + len;
+}
+
+
+
+static void
+ungrabstackstr(s, p)
+ char *s;
+ char *p;
+ {
+ stacknleft += stacknxt - s;
+ stacknxt = s;
+ sstrnleft = stacknleft - (p - s);
+}
+/* $NetBSD: miscbltin.c,v 1.30 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Miscelaneous builtins.
+ */
+
+
+#undef rflag
+
+#ifdef __GLIBC__
+mode_t getmode(const void *, mode_t);
+static void *setmode(const char *);
+
+#if !defined(__GLIBC__) || __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
+typedef enum __rlimit_resource rlim_t;
+#endif
+#endif
+
+
+
+/*
+ * The read builtin. The -e option causes backslashes to escape the
+ * following character.
+ *
+ * This uses unbuffered input, which may be avoidable in some cases.
+ */
+
+static int
+readcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char **ap;
+ int backslash;
+ char c;
+ int rflag;
+ char *prompt;
+ const char *ifs;
+ char *p;
+ int startword;
+ int status;
+ int i;
+
+ rflag = 0;
+ prompt = NULL;
+ while ((i = nextopt("p:r")) != '\0') {
+ if (i == 'p')
+ prompt = optionarg;
+ else
+ rflag = 1;
+ }
+ if (prompt && isatty(0)) {
+ putprompt(prompt);
+ flushall();
+ }
+ if (*(ap = argptr) == NULL)
+ error("arg count");
+ if ((ifs = bltinlookup("IFS")) == NULL)
+ ifs = defifs;
+ status = 0;
+ startword = 1;
+ backslash = 0;
+ STARTSTACKSTR(p);
+ for (;;) {
+ if (read(0, &c, 1) != 1) {
+ status = 1;
+ break;
+ }
+ if (c == '\0')
+ continue;
+ if (backslash) {
+ backslash = 0;
+ if (c != '\n')
+ STPUTC(c, p);
+ continue;
+ }
+ if (!rflag && c == '\\') {
+ backslash++;
+ continue;
+ }
+ if (c == '\n')
+ break;
+ if (startword && *ifs == ' ' && strchr(ifs, c)) {
+ continue;
+ }
+ startword = 0;
+ if (backslash && c == '\\') {
+ if (read(0, &c, 1) != 1) {
+ status = 1;
+ break;
+ }
+ STPUTC(c, p);
+ } else if (ap[1] != NULL && strchr(ifs, c) != NULL) {
+ STACKSTRNUL(p);
+ setvar(*ap, stackblock(), 0);
+ ap++;
+ startword = 1;
+ STARTSTACKSTR(p);
+ } else {
+ STPUTC(c, p);
+ }
+ }
+ STACKSTRNUL(p);
+ /* Remove trailing blanks */
+ while (stackblock() <= --p && strchr(ifs, *p) != NULL)
+ *p = '\0';
+ setvar(*ap, stackblock(), 0);
+ while (*++ap != NULL)
+ setvar(*ap, nullstr, 0);
+ return status;
+}
+
+
+
+static int
+umaskcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char *ap;
+ int mask;
+ int i;
+ int symbolic_mode = 0;
+
+ while ((i = nextopt("S")) != '\0') {
+ symbolic_mode = 1;
+ }
+
+ INTOFF;
+ mask = umask(0);
+ umask(mask);
+ INTON;
+
+ if ((ap = *argptr) == NULL) {
+ if (symbolic_mode) {
+ char u[4], g[4], o[4];
+
+ i = 0;
+ if ((mask & S_IRUSR) == 0)
+ u[i++] = 'r';
+ if ((mask & S_IWUSR) == 0)
+ u[i++] = 'w';
+ if ((mask & S_IXUSR) == 0)
+ u[i++] = 'x';
+ u[i] = '\0';
+
+ i = 0;
+ if ((mask & S_IRGRP) == 0)
+ g[i++] = 'r';
+ if ((mask & S_IWGRP) == 0)
+ g[i++] = 'w';
+ if ((mask & S_IXGRP) == 0)
+ g[i++] = 'x';
+ g[i] = '\0';
+
+ i = 0;
+ if ((mask & S_IROTH) == 0)
+ o[i++] = 'r';
+ if ((mask & S_IWOTH) == 0)
+ o[i++] = 'w';
+ if ((mask & S_IXOTH) == 0)
+ o[i++] = 'x';
+ o[i] = '\0';
+
+ out1fmt("u=%s,g=%s,o=%s\n", u, g, o);
+ } else {
+ out1fmt("%.4o\n", mask);
+ }
+ } else {
+ if (isdigit((unsigned char)*ap)) {
+ mask = 0;
+ do {
+ if (*ap >= '8' || *ap < '0')
+ error("Illegal number: %s", argv[1]);
+ mask = (mask << 3) + (*ap - '0');
+ } while (*++ap != '\0');
+ umask(mask);
+ } else {
+ void *set;
+
+ INTOFF;
+ if ((set = setmode(ap)) != 0) {
+ mask = getmode(set, ~mask & 0777);
+ ckfree(set);
+ }
+ INTON;
+ if (!set)
+ error("Illegal mode: %s", ap);
+
+ umask(~mask & 0777);
+ }
+ }
+ return 0;
+}
+
+/*
+ * ulimit builtin
+ *
+ * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
+ * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
+ * ash by J.T. Conklin.
+ *
+ * Public domain.
+ */
+
+struct limits {
+ const char *name;
+ int cmd;
+ int factor; /* multiply by to get rlim_{cur,max} values */
+ char option;
+};
+
+static const struct limits limits[] = {
+#ifdef RLIMIT_CPU
+ { "time(seconds)", RLIMIT_CPU, 1, 't' },
+#endif
+#ifdef RLIMIT_FSIZE
+ { "file(blocks)", RLIMIT_FSIZE, 512, 'f' },
+#endif
+#ifdef RLIMIT_DATA
+ { "data(kbytes)", RLIMIT_DATA, 1024, 'd' },
+#endif
+#ifdef RLIMIT_STACK
+ { "stack(kbytes)", RLIMIT_STACK, 1024, 's' },
+#endif
+#ifdef RLIMIT_CORE
+ { "coredump(blocks)", RLIMIT_CORE, 512, 'c' },
+#endif
+#ifdef RLIMIT_RSS
+ { "memory(kbytes)", RLIMIT_RSS, 1024, 'm' },
+#endif
+#ifdef RLIMIT_MEMLOCK
+ { "locked memory(kbytes)", RLIMIT_MEMLOCK, 1024, 'l' },
+#endif
+#ifdef RLIMIT_NPROC
+ { "process(processes)", RLIMIT_NPROC, 1, 'p' },
+#endif
+#ifdef RLIMIT_NOFILE
+ { "nofiles(descriptors)", RLIMIT_NOFILE, 1, 'n' },
+#endif
+#ifdef RLIMIT_VMEM
+ { "vmemory(kbytes)", RLIMIT_VMEM, 1024, 'v' },
+#endif
+#ifdef RLIMIT_SWAP
+ { "swap(kbytes)", RLIMIT_SWAP, 1024, 'w' },
+#endif
+ { (char *) 0, 0, 0, '\0' }
+};
+
+static int
+ulimitcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int c;
+ rlim_t val = 0;
+ enum { SOFT = 0x1, HARD = 0x2 }
+ how = SOFT | HARD;
+ const struct limits *l;
+ int set, all = 0;
+ int optc, what;
+ struct rlimit limit;
+
+ what = 'f';
+ while ((optc = nextopt("HSatfdsmcnpl")) != '\0')
+ switch (optc) {
+ case 'H':
+ how = HARD;
+ break;
+ case 'S':
+ how = SOFT;
+ break;
+ case 'a':
+ all = 1;
+ break;
+ default:
+ what = optc;
+ }
+
+ for (l = limits; l->name && l->option != what; l++)
+ ;
+ if (!l->name)
+ error("internal error (%c)", what);
+
+ set = *argptr ? 1 : 0;
+ if (set) {
+ char *p = *argptr;
+
+ if (all || argptr[1])
+ error("too many arguments");
+ if (strcmp(p, "unlimited") == 0)
+ val = RLIM_INFINITY;
+ else {
+ val = (rlim_t) 0;
+
+ while ((c = *p++) >= '0' && c <= '9')
+ {
+ val = (val * 10) + (long)(c - '0');
+ if (val < (rlim_t) 0)
+ break;
+ }
+ if (c)
+ error("bad number");
+ val *= l->factor;
+ }
+ }
+ if (all) {
+ for (l = limits; l->name; l++) {
+ getrlimit(l->cmd, &limit);
+ if (how & SOFT)
+ val = limit.rlim_cur;
+ else if (how & HARD)
+ val = limit.rlim_max;
+
+ out1fmt("%-20s ", l->name);
+ if (val == RLIM_INFINITY)
+ out1fmt("unlimited\n");
+ else
+ {
+ val /= l->factor;
+#ifdef BSD4_4
+ out1fmt("%lld\n", (long long) val);
+#else
+ out1fmt("%ld\n", (long) val);
+#endif
+ }
+ }
+ return 0;
+ }
+
+ getrlimit(l->cmd, &limit);
+ if (set) {
+ if (how & HARD)
+ limit.rlim_max = val;
+ if (how & SOFT)
+ limit.rlim_cur = val;
+ if (setrlimit(l->cmd, &limit) < 0)
+ error("error setting limit (%s)", strerror(errno));
+ } else {
+ if (how & SOFT)
+ val = limit.rlim_cur;
+ else if (how & HARD)
+ val = limit.rlim_max;
+
+ if (val == RLIM_INFINITY)
+ out1fmt("unlimited\n");
+ else
+ {
+ val /= l->factor;
+#ifdef BSD4_4
+ out1fmt("%lld\n", (long long) val);
+#else
+ out1fmt("%ld\n", (long) val);
+#endif
+ }
+ }
+ return 0;
+}
+/* $NetBSD: mystring.c,v 1.14 1999/07/09 03:05:50 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * String functions.
+ *
+ * equal(s1, s2) Return true if strings are equal.
+ * scopy(from, to) Copy a string.
+ * scopyn(from, to, n) Like scopy, but checks for overflow.
+ * number(s) Convert a string of digits to an integer.
+ * is_number(s) Return true if s is a string of digits.
+ */
+
+static char nullstr[1]; /* zero length string */
+static const char spcstr[] = " ";
+static const char snlfmt[] = "%s\n";
+
+/*
+ * equal - #defined in mystring.h
+ */
+
+/*
+ * scopy - #defined in mystring.h
+ */
+
+
+#if 0
+/*
+ * scopyn - copy a string from "from" to "to", truncating the string
+ * if necessary. "To" is always nul terminated, even if
+ * truncation is performed. "Size" is the size of "to".
+ */
+
+static void
+scopyn(from, to, size)
+ char const *from;
+ char *to;
+ int size;
+ {
+
+ while (--size > 0) {
+ if ((*to++ = *from++) == '\0')
+ return;
+ }
+ *to = '\0';
+}
+#endif
+
+
+/*
+ * prefix -- see if pfx is a prefix of string.
+ */
+
+static int
+prefix(pfx, string)
+ char const *pfx;
+ char const *string;
+ {
+ while (*pfx) {
+ if (*pfx++ != *string++)
+ return 0;
+ }
+ return 1;
+}
+
+
+/*
+ * Convert a string of digits to an integer, printing an error message on
+ * failure.
+ */
+
+static int
+number(s)
+ const char *s;
+ {
+
+ if (! is_number(s))
+ error("Illegal number: %s", s);
+ return atoi(s);
+}
+
+
+
+/*
+ * Check for a valid number. This should be elsewhere.
+ */
+
+static int
+is_number(p)
+ const char *p;
+ {
+ do {
+ if (! is_digit(*p))
+ return 0;
+ } while (*++p != '\0');
+ return 1;
+}
+
+
+/*
+ * Produce a possibly single quoted string suitable as input to the shell.
+ * The return string is allocated on the stack.
+ */
+
+static char *
+single_quote(const char *s) {
+ char *p;
+
+ STARTSTACKSTR(p);
+
+ do {
+ char *q = p;
+ size_t len1, len1p, len2, len2p;
+
+ len1 = strcspn(s, "'");
+ len2 = strspn(s + len1, "'");
+
+ len1p = len1 ? len1 + 2 : len1;
+ switch (len2) {
+ case 0:
+ len2p = 0;
+ break;
+ case 1:
+ len2p = 2;
+ break;
+ default:
+ len2p = len2 + 2;
+ }
+
+ CHECKSTRSPACE(len1p + len2p + 1, p);
+
+ if (len1) {
+ *p = '\'';
+#ifdef _GNU_SOURCE
+ q = mempcpy(p + 1, s, len1);
+#else
+ q = p + 1 + len1;
+ memcpy(p + 1, s, len1);
+#endif
+ *q++ = '\'';
+ s += len1;
+ }
+
+ switch (len2) {
+ case 0:
+ break;
+ case 1:
+ *q++ = '\\';
+ *q = '\'';
+ s++;
+ break;
+ default:
+ *q = '"';
+#ifdef _GNU_SOURCE
+ *(char *) mempcpy(q + 1, s, len2) = '"';
+#else
+ q += 1 + len2;
+ memcpy(q + 1, s, len2);
+ *q = '"';
+#endif
+ s += len2;
+ }
+
+ STADJUST(len1p + len2p, p);
+ } while (*s);
+
+ USTPUTC(0, p);
+
+ return grabstackstr(p);
+}
+
+/*
+ * Like strdup but works with the ash stack.
+ */
+
+static char *
+sstrdup(const char *p)
+{
+ size_t len = strlen(p) + 1;
+ return memcpy(stalloc(len), p, len);
+}
+
+/*
+ * Wrapper around strcmp for qsort/bsearch/...
+ */
+static int
+pstrcmp(const void *a, const void *b)
+{
+ return strcmp(*(const char *const *) a, *(const char *const *) b);
+}
+
+/*
+ * Find a string is in a sorted array.
+ */
+static const char *const *
+findstring(const char *s, const char *const *array, size_t nmemb)
+{
+ return bsearch(&s, array, nmemb, sizeof(const char *), pstrcmp);
+}
+/*
+ * This file was generated by the mknodes program.
+ */
+
+/* $NetBSD: nodes.c.pat,v 1.8 1997/04/11 23:03:09 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)nodes.c.pat 8.2 (Berkeley) 5/4/95
+ */
+
+/*
+ * Routine for dealing with parsed shell commands.
+ */
+
+
+static int funcblocksize; /* size of structures in function */
+static int funcstringsize; /* size of strings in node */
+pointer funcblock; /* block to allocate function from */
+static char *funcstring; /* block to allocate strings from */
+
+static const short nodesize[26] = {
+ ALIGN(sizeof (struct nbinary)),
+ ALIGN(sizeof (struct ncmd)),
+ ALIGN(sizeof (struct npipe)),
+ ALIGN(sizeof (struct nredir)),
+ ALIGN(sizeof (struct nredir)),
+ ALIGN(sizeof (struct nredir)),
+ ALIGN(sizeof (struct nbinary)),
+ ALIGN(sizeof (struct nbinary)),
+ ALIGN(sizeof (struct nif)),
+ ALIGN(sizeof (struct nbinary)),
+ ALIGN(sizeof (struct nbinary)),
+ ALIGN(sizeof (struct nfor)),
+ ALIGN(sizeof (struct ncase)),
+ ALIGN(sizeof (struct nclist)),
+ ALIGN(sizeof (struct narg)),
+ ALIGN(sizeof (struct narg)),
+ ALIGN(sizeof (struct nfile)),
+ ALIGN(sizeof (struct nfile)),
+ ALIGN(sizeof (struct nfile)),
+ ALIGN(sizeof (struct nfile)),
+ ALIGN(sizeof (struct nfile)),
+ ALIGN(sizeof (struct ndup)),
+ ALIGN(sizeof (struct ndup)),
+ ALIGN(sizeof (struct nhere)),
+ ALIGN(sizeof (struct nhere)),
+ ALIGN(sizeof (struct nnot)),
+};
+
+
+static void calcsize __P((union node *));
+static void sizenodelist __P((struct nodelist *));
+static union node *copynode __P((union node *));
+static struct nodelist *copynodelist __P((struct nodelist *));
+static char *nodesavestr __P((char *));
+
+
+
+/*
+ * Make a copy of a parse tree.
+ */
+
+union node *
+copyfunc(n)
+ union node *n;
+{
+ if (n == NULL)
+ return NULL;
+ funcblocksize = 0;
+ funcstringsize = 0;
+ calcsize(n);
+ funcblock = ckmalloc(funcblocksize + funcstringsize);
+ funcstring = (char *) funcblock + funcblocksize;
+ return copynode(n);
+}
+
+
+
+static void
+calcsize(n)
+ union node *n;
+{
+ if (n == NULL)
+ return;
+ funcblocksize += nodesize[n->type];
+ switch (n->type) {
+ case NSEMI:
+ case NAND:
+ case NOR:
+ case NWHILE:
+ case NUNTIL:
+ calcsize(n->nbinary.ch2);
+ calcsize(n->nbinary.ch1);
+ break;
+ case NCMD:
+ calcsize(n->ncmd.redirect);
+ calcsize(n->ncmd.args);
+ calcsize(n->ncmd.assign);
+ break;
+ case NPIPE:
+ sizenodelist(n->npipe.cmdlist);
+ break;
+ case NREDIR:
+ case NBACKGND:
+ case NSUBSHELL:
+ calcsize(n->nredir.redirect);
+ calcsize(n->nredir.n);
+ break;
+ case NIF:
+ calcsize(n->nif.elsepart);
+ calcsize(n->nif.ifpart);
+ calcsize(n->nif.test);
+ break;
+ case NFOR:
+ funcstringsize += strlen(n->nfor.var) + 1;
+ calcsize(n->nfor.body);
+ calcsize(n->nfor.args);
+ break;
+ case NCASE:
+ calcsize(n->ncase.cases);
+ calcsize(n->ncase.expr);
+ break;
+ case NCLIST:
+ calcsize(n->nclist.body);
+ calcsize(n->nclist.pattern);
+ calcsize(n->nclist.next);
+ break;
+ case NDEFUN:
+ case NARG:
+ sizenodelist(n->narg.backquote);
+ funcstringsize += strlen(n->narg.text) + 1;
+ calcsize(n->narg.next);
+ break;
+ case NTO:
+ case NFROM:
+ case NFROMTO:
+ case NAPPEND:
+ case NTOOV:
+ calcsize(n->nfile.fname);
+ calcsize(n->nfile.next);
+ break;
+ case NTOFD:
+ case NFROMFD:
+ calcsize(n->ndup.vname);
+ calcsize(n->ndup.next);
+ break;
+ case NHERE:
+ case NXHERE:
+ calcsize(n->nhere.doc);
+ calcsize(n->nhere.next);
+ break;
+ case NNOT:
+ calcsize(n->nnot.com);
+ break;
+ };
+}
+
+
+
+static void
+sizenodelist(lp)
+ struct nodelist *lp;
+{
+ while (lp) {
+ funcblocksize += ALIGN(sizeof(struct nodelist));
+ calcsize(lp->n);
+ lp = lp->next;
+ }
+}
+
+
+
+static union node *
+copynode(n)
+ union node *n;
+{
+ union node *new;
+
+ if (n == NULL)
+ return NULL;
+ new = funcblock;
+ funcblock = (char *) funcblock + nodesize[n->type];
+ switch (n->type) {
+ case NSEMI:
+ case NAND:
+ case NOR:
+ case NWHILE:
+ case NUNTIL:
+ new->nbinary.ch2 = copynode(n->nbinary.ch2);
+ new->nbinary.ch1 = copynode(n->nbinary.ch1);
+ break;
+ case NCMD:
+ new->ncmd.redirect = copynode(n->ncmd.redirect);
+ new->ncmd.args = copynode(n->ncmd.args);
+ new->ncmd.assign = copynode(n->ncmd.assign);
+ new->ncmd.backgnd = n->ncmd.backgnd;
+ break;
+ case NPIPE:
+ new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
+ new->npipe.backgnd = n->npipe.backgnd;
+ break;
+ case NREDIR:
+ case NBACKGND:
+ case NSUBSHELL:
+ new->nredir.redirect = copynode(n->nredir.redirect);
+ new->nredir.n = copynode(n->nredir.n);
+ break;
+ case NIF:
+ new->nif.elsepart = copynode(n->nif.elsepart);
+ new->nif.ifpart = copynode(n->nif.ifpart);
+ new->nif.test = copynode(n->nif.test);
+ break;
+ case NFOR:
+ new->nfor.var = nodesavestr(n->nfor.var);
+ new->nfor.body = copynode(n->nfor.body);
+ new->nfor.args = copynode(n->nfor.args);
+ break;
+ case NCASE:
+ new->ncase.cases = copynode(n->ncase.cases);
+ new->ncase.expr = copynode(n->ncase.expr);
+ break;
+ case NCLIST:
+ new->nclist.body = copynode(n->nclist.body);
+ new->nclist.pattern = copynode(n->nclist.pattern);
+ new->nclist.next = copynode(n->nclist.next);
+ break;
+ case NDEFUN:
+ case NARG:
+ new->narg.backquote = copynodelist(n->narg.backquote);
+ new->narg.text = nodesavestr(n->narg.text);
+ new->narg.next = copynode(n->narg.next);
+ break;
+ case NTO:
+ case NFROM:
+ case NFROMTO:
+ case NAPPEND:
+ case NTOOV:
+ new->nfile.fname = copynode(n->nfile.fname);
+ new->nfile.fd = n->nfile.fd;
+ new->nfile.next = copynode(n->nfile.next);
+ break;
+ case NTOFD:
+ case NFROMFD:
+ new->ndup.vname = copynode(n->ndup.vname);
+ new->ndup.dupfd = n->ndup.dupfd;
+ new->ndup.fd = n->ndup.fd;
+ new->ndup.next = copynode(n->ndup.next);
+ break;
+ case NHERE:
+ case NXHERE:
+ new->nhere.doc = copynode(n->nhere.doc);
+ new->nhere.fd = n->nhere.fd;
+ new->nhere.next = copynode(n->nhere.next);
+ break;
+ case NNOT:
+ new->nnot.com = copynode(n->nnot.com);
+ break;
+ };
+ new->type = n->type;
+ return new;
+}
+
+
+static struct nodelist *
+copynodelist(lp)
+ struct nodelist *lp;
+{
+ struct nodelist *start;
+ struct nodelist **lpp;
+
+ lpp = &start;
+ while (lp) {
+ *lpp = funcblock;
+ funcblock = (char *) funcblock + ALIGN(sizeof(struct nodelist));
+ (*lpp)->n = copynode(lp->n);
+ lp = lp->next;
+ lpp = &(*lpp)->next;
+ }
+ *lpp = NULL;
+ return start;
+}
+
+
+
+static char *
+nodesavestr(s)
+ char *s;
+{
+#ifdef _GNU_SOURCE
+ char *rtn = funcstring;
+
+ funcstring = stpcpy(funcstring, s) + 1;
+ return rtn;
+#else
+ register char *p = s;
+ register char *q = funcstring;
+ char *rtn = funcstring;
+
+ while ((*q++ = *p++) != '\0')
+ continue;
+ funcstring = q;
+ return rtn;
+#endif
+}
+
+
+
+/*
+ * Free a parse tree.
+ */
+
+static void
+freefunc(n)
+ union node *n;
+{
+ if (n)
+ ckfree(n);
+}
+/* $NetBSD: options.c,v 1.31 2001/02/26 13:06:43 wiz Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+struct optent optlist[NOPTS] = {
+ { "errexit", 'e', 0 },
+ { "noglob", 'f', 0 },
+ { "ignoreeof", 'I', 0 },
+ { "interactive",'i', 0 },
+ { "monitor", 'm', 0 },
+ { "noexec", 'n', 0 },
+ { "stdin", 's', 0 },
+ { "xtrace", 'x', 0 },
+ { "verbose", 'v', 0 },
+ { "vi", 'V', 0 },
+ { "emacs", 'E', 0 },
+ { "noclobber", 'C', 0 },
+ { "allexport", 'a', 0 },
+ { "notify", 'b', 0 },
+ { "nounset", 'u', 0 },
+ { "quietprofile", 'q', 0 },
+};
+static char *arg0; /* value of $0 */
+struct shparam shellparam; /* current positional parameters */
+static char **argptr; /* argument list for builtin commands */
+static char *optionarg; /* set by nextopt (like getopt) */
+static char *optptr; /* used by nextopt */
+
+static char *minusc; /* argument to -c option */
+
+
+static void options __P((int));
+static void minus_o __P((char *, int));
+static void setoption __P((int, int));
+#ifdef ASH_GETOPTS
+static int getopts __P((char *, char *, char **, int *, int *));
+#endif
+
+
+/*
+ * Process the shell command line arguments.
+ */
+
+static void
+procargs(argc, argv)
+ int argc;
+ char **argv;
+{
+ int i;
+
+ argptr = argv;
+ if (argc > 0)
+ argptr++;
+ for (i = 0; i < NOPTS; i++)
+ optlist[i].val = 2;
+ options(1);
+ if (*argptr == NULL && minusc == NULL)
+ sflag = 1;
+ if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
+ iflag = 1;
+ if (mflag == 2)
+ mflag = iflag;
+ for (i = 0; i < NOPTS; i++)
+ if (optlist[i].val == 2)
+ optlist[i].val = 0;
+ arg0 = argv[0];
+ if (sflag == 0 && minusc == NULL) {
+ commandname = argv[0];
+ arg0 = *argptr++;
+ setinputfile(arg0, 0);
+ commandname = arg0;
+ }
+ /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
+ if (argptr && minusc && *argptr)
+ arg0 = *argptr++;
+
+ shellparam.p = argptr;
+ shellparam.optind = 1;
+ shellparam.optoff = -1;
+ /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
+ while (*argptr) {
+ shellparam.nparam++;
+ argptr++;
+ }
+ optschanged();
+}
+
+
+static void
+optschanged()
+{
+ setinteractive(iflag);
+ setjobctl(mflag);
+}
+
+/*
+ * Process shell options. The global variable argptr contains a pointer
+ * to the argument list; we advance it past the options.
+ */
+
+static void
+options(cmdline)
+ int cmdline;
+{
+ char *p;
+ int val;
+ int c;
+
+ if (cmdline)
+ minusc = NULL;
+ while ((p = *argptr) != NULL) {
+ argptr++;
+ if ((c = *p++) == '-') {
+ val = 1;
+ if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
+ if (!cmdline) {
+ /* "-" means turn off -x and -v */
+ if (p[0] == '\0')
+ xflag = vflag = 0;
+ /* "--" means reset params */
+ else if (*argptr == NULL)
+ setparam(argptr);
+ }
+ break; /* "-" or "--" terminates options */
+ }
+ } else if (c == '+') {
+ val = 0;
+ } else {
+ argptr--;
+ break;
+ }
+ while ((c = *p++) != '\0') {
+ if (c == 'c' && cmdline) {
+ char *q;
+#ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
+ if (*p == '\0')
+#endif
+ q = *argptr++;
+ if (q == NULL || minusc != NULL)
+ error("Bad -c option");
+ minusc = q;
+#ifdef NOHACK
+ break;
+#endif
+ } else if (c == 'o') {
+ minus_o(*argptr, val);
+ if (*argptr)
+ argptr++;
+ } else {
+ setoption(c, val);
+ }
+ }
+ }
+}
+
+static void
+minus_o(name, val)
+ char *name;
+ int val;
+{
+ int i;
+
+ if (name == NULL) {
+ out1str("Current option settings\n");
+ for (i = 0; i < NOPTS; i++)
+ out1fmt("%-16s%s\n", optlist[i].name,
+ optlist[i].val ? "on" : "off");
+ } else {
+ for (i = 0; i < NOPTS; i++)
+ if (equal(name, optlist[i].name)) {
+ setoption(optlist[i].letter, val);
+ return;
+ }
+ error("Illegal option -o %s", name);
+ }
+}
+
+
+static void
+setoption(flag, val)
+ char flag;
+ int val;
+ {
+ int i;
+
+ for (i = 0; i < NOPTS; i++)
+ if (optlist[i].letter == flag) {
+ optlist[i].val = val;
+ if (val) {
+ /* #%$ hack for ksh semantics */
+ if (flag == 'V')
+ Eflag = 0;
+ else if (flag == 'E')
+ Vflag = 0;
+ }
+ return;
+ }
+ error("Illegal option -%c", flag);
+ /* NOTREACHED */
+}
+
+
+
+#ifdef mkinit
+SHELLPROC {
+ int i;
+
+ for (i = 0; i < NOPTS; i++)
+ optlist[i].val = 0;
+ optschanged();
+
+}
+#endif
+
+
+/*
+ * Set the shell parameters.
+ */
+
+static void
+setparam(argv)
+ char **argv;
+ {
+ char **newparam;
+ char **ap;
+ int nparam;
+
+ for (nparam = 0 ; argv[nparam] ; nparam++);
+ ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
+ while (*argv) {
+ *ap++ = savestr(*argv++);
+ }
+ *ap = NULL;
+ freeparam(&shellparam);
+ shellparam.malloc = 1;
+ shellparam.nparam = nparam;
+ shellparam.p = newparam;
+ shellparam.optind = 1;
+ shellparam.optoff = -1;
+}
+
+
+/*
+ * Free the list of positional parameters.
+ */
+
+static void
+freeparam(param)
+ volatile struct shparam *param;
+ {
+ char **ap;
+
+ if (param->malloc) {
+ for (ap = param->p ; *ap ; ap++)
+ ckfree(*ap);
+ ckfree(param->p);
+ }
+}
+
+
+
+/*
+ * The shift builtin command.
+ */
+
+static int
+shiftcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ int n;
+ char **ap1, **ap2;
+
+ n = 1;
+ if (argc > 1)
+ n = number(argv[1]);
+ if (n > shellparam.nparam)
+ error("can't shift that many");
+ INTOFF;
+ shellparam.nparam -= n;
+ for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
+ if (shellparam.malloc)
+ ckfree(*ap1);
+ }
+ ap2 = shellparam.p;
+ while ((*ap2++ = *ap1++) != NULL);
+ shellparam.optind = 1;
+ shellparam.optoff = -1;
+ INTON;
+ return 0;
+}
+
+
+
+/*
+ * The set command builtin.
+ */
+
+static int
+setcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ if (argc == 1)
+ return showvarscmd(argc, argv);
+ INTOFF;
+ options(0);
+ optschanged();
+ if (*argptr != NULL) {
+ setparam(argptr);
+ }
+ INTON;
+ return 0;
+}
+
+
+static void
+getoptsreset(value)
+ const char *value;
+{
+ shellparam.optind = number(value);
+ shellparam.optoff = -1;
+}
+
+#ifdef ASH_GETOPTS
+/*
+ * The getopts builtin. Shellparam.optnext points to the next argument
+ * to be processed. Shellparam.optptr points to the next character to
+ * be processed in the current argument. If shellparam.optnext is NULL,
+ * then it's the first time getopts has been called.
+ */
+
+static int
+getoptscmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char **optbase;
+
+ if (argc < 3)
+ error("Usage: getopts optstring var [arg]");
+ else if (argc == 3) {
+ optbase = shellparam.p;
+ if (shellparam.optind > shellparam.nparam + 1) {
+ shellparam.optind = 1;
+ shellparam.optoff = -1;
+ }
+ }
+ else {
+ optbase = &argv[3];
+ if (shellparam.optind > argc - 2) {
+ shellparam.optind = 1;
+ shellparam.optoff = -1;
+ }
+ }
+
+ return getopts(argv[1], argv[2], optbase, &shellparam.optind,
+ &shellparam.optoff);
+}
+
+/*
+ * Safe version of setvar, returns 1 on success 0 on failure.
+ */
+
+static int
+setvarsafe(name, val, flags)
+ const char *name, *val;
+ int flags;
+{
+ struct jmploc jmploc;
+ struct jmploc *volatile savehandler = handler;
+ int err = 0;
+#ifdef __GNUC__
+ (void) &err;
+#endif
+
+ if (setjmp(jmploc.loc))
+ err = 1;
+ else {
+ handler = &jmploc;
+ setvar(name, val, flags);
+ }
+ handler = savehandler;
+ return err;
+}
+
+static int
+getopts(optstr, optvar, optfirst, myoptind, optoff)
+ char *optstr;
+ char *optvar;
+ char **optfirst;
+ int *myoptind;
+ int *optoff;
+{
+ char *p, *q;
+ char c = '?';
+ int done = 0;
+ int err = 0;
+ char s[10];
+ char **optnext = optfirst + *myoptind - 1;
+
+ if (*myoptind <= 1 || *optoff < 0 || !(*(optnext - 1)) ||
+ strlen(*(optnext - 1)) < *optoff)
+ p = NULL;
+ else
+ p = *(optnext - 1) + *optoff;
+ if (p == NULL || *p == '\0') {
+ /* Current word is done, advance */
+ if (optnext == NULL)
+ return 1;
+ p = *optnext;
+ if (p == NULL || *p != '-' || *++p == '\0') {
+atend:
+ *myoptind = optnext - optfirst + 1;
+ p = NULL;
+ done = 1;
+ goto out;
+ }
+ optnext++;
+ if (p[0] == '-' && p[1] == '\0') /* check for "--" */
+ goto atend;
+ }
+
+ c = *p++;
+ for (q = optstr; *q != c; ) {
+ if (*q == '\0') {
+ if (optstr[0] == ':') {
+ s[0] = c;
+ s[1] = '\0';
+ err |= setvarsafe("OPTARG", s, 0);
+ }
+ else {
+ outfmt(&errout, "Illegal option -%c\n", c);
+ (void) unsetvar("OPTARG");
+ }
+ c = '?';
+ goto bad;
+ }
+ if (*++q == ':')
+ q++;
+ }
+
+ if (*++q == ':') {
+ if (*p == '\0' && (p = *optnext) == NULL) {
+ if (optstr[0] == ':') {
+ s[0] = c;
+ s[1] = '\0';
+ err |= setvarsafe("OPTARG", s, 0);
+ c = ':';
+ }
+ else {
+ outfmt(&errout, "No arg for -%c option\n", c);
+ (void) unsetvar("OPTARG");
+ c = '?';
+ }
+ goto bad;
+ }
+
+ if (p == *optnext)
+ optnext++;
+ setvarsafe("OPTARG", p, 0);
+ p = NULL;
+ }
+ else
+ setvarsafe("OPTARG", "", 0);
+ *myoptind = optnext - optfirst + 1;
+ goto out;
+
+bad:
+ *myoptind = 1;
+ p = NULL;
+out:
+ *optoff = p ? p - *(optnext - 1) : -1;
+ fmtstr(s, sizeof(s), "%d", *myoptind);
+ err |= setvarsafe("OPTIND", s, VNOFUNC);
+ s[0] = c;
+ s[1] = '\0';
+ err |= setvarsafe(optvar, s, 0);
+ if (err) {
+ *myoptind = 1;
+ *optoff = -1;
+ flushall();
+ exraise(EXERROR);
+ }
+ return done;
+}
+#endif
+
+/*
+ * XXX - should get rid of. have all builtins use getopt(3). the
+ * library getopt must have the BSD extension static variable "optreset"
+ * otherwise it can't be used within the shell safely.
+ *
+ * Standard option processing (a la getopt) for builtin routines. The
+ * only argument that is passed to nextopt is the option string; the
+ * other arguments are unnecessary. It return the character, or '\0' on
+ * end of input.
+ */
+
+static int
+nextopt(optstring)
+ const char *optstring;
+ {
+ char *p;
+ const char *q;
+ char c;
+
+ if ((p = optptr) == NULL || *p == '\0') {
+ p = *argptr;
+ if (p == NULL || *p != '-' || *++p == '\0')
+ return '\0';
+ argptr++;
+ if (p[0] == '-' && p[1] == '\0') /* check for "--" */
+ return '\0';
+ }
+ c = *p++;
+ for (q = optstring ; *q != c ; ) {
+ if (*q == '\0')
+ error("Illegal option -%c", c);
+ if (*++q == ':')
+ q++;
+ }
+ if (*++q == ':') {
+ if (*p == '\0' && (p = *argptr++) == NULL)
+ error("No arg for -%c option", c);
+ optionarg = p;
+ p = NULL;
+ }
+ optptr = p;
+ return c;
+}
+
+
+/* $NetBSD: output.c,v 1.23 2001/01/07 23:39:07 lukem Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Shell output routines. We use our own output routines because:
+ * When a builtin command is interrupted we have to discard
+ * any pending output.
+ * When a builtin command appears in back quotes, we want to
+ * save the output of the command in a region obtained
+ * via malloc, rather than doing a fork and reading the
+ * output of the command via a pipe.
+ * Our output routines may be smaller than the stdio routines.
+ */
+
+
+#define OUTBUFSIZ BUFSIZ
+#define MEM_OUT -3 /* output to dynamically allocated memory */
+
+
+#ifdef USE_GLIBC_STDIO
+struct output output = {NULL, NULL, 0, NULL, 0, 1, 0};
+struct output errout = {NULL, NULL, 0, NULL, 0, 2, 0};
+struct output memout = {NULL, NULL, 0, NULL, 0, MEM_OUT, 0};
+#else
+struct output output = {NULL, 0, NULL, OUTBUFSIZ, 1, 0};
+struct output errout = {NULL, 0, NULL, 0, 2, 0};
+struct output memout = {NULL, 0, NULL, 0, MEM_OUT, 0};
+#endif
+struct output *out1 = &output;
+struct output *out2 = &errout;
+
+
+#ifndef USE_GLIBC_STDIO
+static void __outstr __P((const char *, size_t, struct output*));
+#endif
+
+
+#ifdef mkinit
+
+INCLUDE "output.h"
+INCLUDE "memalloc.h"
+
+INIT {
+#ifdef USE_GLIBC_STDIO
+ initstreams();
+#endif
+}
+
+RESET {
+ out1 = &output;
+ out2 = &errout;
+#ifdef USE_GLIBC_STDIO
+ if (memout.stream != NULL)
+ __closememout();
+#endif
+ if (memout.buf != NULL) {
+ ckfree(memout.buf);
+ memout.buf = NULL;
+ }
+}
+
+#endif
+
+
+#ifndef USE_GLIBC_STDIO
+static void
+__outstr(const char *p, size_t len, struct output *dest) {
+ if (!dest->bufsize) {
+ dest->nleft = 0;
+ } else if (dest->buf == NULL) {
+ if (len > dest->bufsize && dest->fd == MEM_OUT) {
+ dest->bufsize = len;
+ }
+ INTOFF;
+ dest->buf = ckmalloc(dest->bufsize);
+ dest->nextc = dest->buf;
+ dest->nleft = dest->bufsize;
+ INTON;
+ } else if (dest->fd == MEM_OUT) {
+ int offset;
+
+ offset = dest->bufsize;
+ INTOFF;
+ if (dest->bufsize >= len) {
+ dest->bufsize <<= 1;
+ } else {
+ dest->bufsize += len;
+ }
+ dest->buf = ckrealloc(dest->buf, dest->bufsize);
+ dest->nleft = dest->bufsize - offset;
+ dest->nextc = dest->buf + offset;
+ INTON;
+ } else {
+ flushout(dest);
+ }
+
+ if (len < dest->nleft) {
+ dest->nleft -= len;
+ memcpy(dest->nextc, p, len);
+ dest->nextc += len;
+ return;
+ }
+
+ if (xwrite(dest->fd, p, len) < len)
+ dest->flags |= OUTPUT_ERR;
+}
+#endif
+
+
+static void
+outstr(p, file)
+ const char *p;
+ struct output *file;
+ {
+#ifdef USE_GLIBC_STDIO
+ INTOFF;
+ fputs(p, file->stream);
+ INTON;
+#else
+ size_t len;
+
+ if (!*p) {
+ return;
+ }
+ len = strlen(p);
+ if ((file->nleft -= len) > 0) {
+ memcpy(file->nextc, p, len);
+ file->nextc += len;
+ return;
+ }
+ __outstr(p, len, file);
+#endif
+}
+
+
+#ifndef USE_GLIBC_STDIO
+
+
+static void
+outcslow(c, dest)
+ char c;
+ struct output *dest;
+ {
+ __outstr(&c, 1, dest);
+}
+#endif
+
+
+static void
+flushall() {
+ flushout(&output);
+#ifdef FLUSHERR
+ flushout(&errout);
+#endif
+}
+
+
+static void
+flushout(dest)
+ struct output *dest;
+ {
+#ifdef USE_GLIBC_STDIO
+ INTOFF;
+ fflush(dest->stream);
+ INTON;
+#else
+ size_t len;
+
+ len = dest->nextc - dest->buf;
+ if (dest->buf == NULL || !len || dest->fd < 0)
+ return;
+ dest->nextc = dest->buf;
+ dest->nleft = dest->bufsize;
+ if (xwrite(dest->fd, dest->buf, len) < len)
+ dest->flags |= OUTPUT_ERR;
+#endif
+}
+
+
+static void
+freestdout() {
+ if (output.buf) {
+ INTOFF;
+ ckfree(output.buf);
+ output.buf = NULL;
+ output.nleft = 0;
+ INTON;
+ }
+ output.flags = 0;
+}
+
+
+static void
+#ifdef __STDC__
+outfmt(struct output *file, const char *fmt, ...)
+#else
+static void
+outfmt(va_alist)
+ va_dcl
+#endif
+{
+ va_list ap;
+#ifndef __STDC__
+ struct output *file;
+ const char *fmt;
+
+ va_start(ap);
+ file = va_arg(ap, struct output *);
+ fmt = va_arg(ap, const char *);
+#else
+ va_start(ap, fmt);
+#endif
+ doformat(file, fmt, ap);
+ va_end(ap);
+}
+
+
+static void
+#ifdef __STDC__
+out1fmt(const char *fmt, ...)
+#else
+out1fmt(va_alist)
+ va_dcl
+#endif
+{
+ va_list ap;
+#ifndef __STDC__
+ const char *fmt;
+
+ va_start(ap);
+ fmt = va_arg(ap, const char *);
+#else
+ va_start(ap, fmt);
+#endif
+ doformat(out1, fmt, ap);
+ va_end(ap);
+}
+
+static void
+#ifdef __STDC__
+fmtstr(char *outbuf, size_t length, const char *fmt, ...)
+#else
+fmtstr(va_alist)
+ va_dcl
+#endif
+{
+ va_list ap;
+#ifndef __STDC__
+ char *outbuf;
+ size_t length;
+ const char *fmt;
+
+ va_start(ap);
+ outbuf = va_arg(ap, char *);
+ length = va_arg(ap, size_t);
+ fmt = va_arg(ap, const char *);
+#else
+ va_start(ap, fmt);
+#endif
+ INTOFF;
+ vsnprintf(outbuf, length, fmt, ap);
+ INTON;
+}
+
+#ifndef USE_GLIBC_STDIO
+/*
+ * Formatted output. This routine handles a subset of the printf formats:
+ * - Formats supported: d, u, o, p, X, s, and c.
+ * - The x format is also accepted but is treated like X.
+ * - The l, ll and q modifiers are accepted.
+ * - The - and # flags are accepted; # only works with the o format.
+ * - Width and precision may be specified with any format except c.
+ * - An * may be given for the width or precision.
+ * - The obsolete practice of preceding the width with a zero to get
+ * zero padding is not supported; use the precision field.
+ * - A % may be printed by writing %% in the format string.
+ */
+
+#define TEMPSIZE 24
+
+#ifdef BSD4_4
+#define HAVE_VASPRINTF 1
+#endif
+
+#if !HAVE_VASPRINTF
+static const char digit[] = "0123456789ABCDEF";
+#endif
+
+
+static void
+doformat(dest, f, ap)
+ struct output *dest;
+ const char *f; /* format string */
+ va_list ap;
+{
+#if HAVE_VASPRINTF
+ char *s, *t;
+ int len;
+
+ INTOFF;
+ len = vasprintf(&t, f, ap);
+ if (len < 0) {
+ return;
+ }
+ s = stalloc(++len);
+ memcpy(s, t, len);
+ free(t);
+ INTON;
+ outstr(s, dest);
+ stunalloc(s);
+#else /* !HAVE_VASPRINTF */
+ char c;
+ char temp[TEMPSIZE];
+ int flushleft;
+ int sharp;
+ int width;
+ int prec;
+ int islong;
+ int isquad;
+ char *p;
+ int sign;
+#ifdef BSD4_4
+ quad_t l;
+ u_quad_t num;
+#else
+ long l;
+ u_long num;
+#endif
+ unsigned base;
+ int len;
+ int size;
+ int pad;
+
+ while ((c = *f++) != '\0') {
+ if (c != '%') {
+ outc(c, dest);
+ continue;
+ }
+ flushleft = 0;
+ sharp = 0;
+ width = 0;
+ prec = -1;
+ islong = 0;
+ isquad = 0;
+ for (;;) {
+ if (*f == '-')
+ flushleft++;
+ else if (*f == '#')
+ sharp++;
+ else
+ break;
+ f++;
+ }
+ if (*f == '*') {
+ width = va_arg(ap, int);
+ f++;
+ } else {
+ while (is_digit(*f)) {
+ width = 10 * width + digit_val(*f++);
+ }
+ }
+ if (*f == '.') {
+ if (*++f == '*') {
+ prec = va_arg(ap, int);
+ f++;
+ } else {
+ prec = 0;
+ while (is_digit(*f)) {
+ prec = 10 * prec + digit_val(*f++);
+ }
+ }
+ }
+ if (*f == 'l') {
+ f++;
+ if (*f == 'l') {
+ isquad++;
+ f++;
+ } else
+ islong++;
+ } else if (*f == 'q') {
+ isquad++;
+ f++;
+ }
+ switch (*f) {
+ case 'd':
+#ifdef BSD4_4
+ if (isquad)
+ l = va_arg(ap, quad_t);
+ else
+#endif
+ if (islong)
+ l = va_arg(ap, long);
+ else
+ l = va_arg(ap, int);
+ sign = 0;
+ num = l;
+ if (l < 0) {
+ num = -l;
+ sign = 1;
+ }
+ base = 10;
+ goto number;
+ case 'u':
+ base = 10;
+ goto uns_number;
+ case 'o':
+ base = 8;
+ goto uns_number;
+ case 'p':
+ outc('0', dest);
+ outc('x', dest);
+ /*FALLTHROUGH*/
+ case 'x':
+ /* we don't implement 'x'; treat like 'X' */
+ case 'X':
+ base = 16;
+uns_number: /* an unsigned number */
+ sign = 0;
+#ifdef BSD4_4
+ if (isquad)
+ num = va_arg(ap, u_quad_t);
+ else
+#endif
+ if (islong)
+ num = va_arg(ap, unsigned long);
+ else
+ num = va_arg(ap, unsigned int);
+number: /* process a number */
+ p = temp + TEMPSIZE - 1;
+ *p = '\0';
+ while (num) {
+ *--p = digit[num % base];
+ num /= base;
+ }
+ len = (temp + TEMPSIZE - 1) - p;
+ if (prec < 0)
+ prec = 1;
+ if (sharp && *f == 'o' && prec <= len)
+ prec = len + 1;
+ pad = 0;
+ if (width) {
+ size = len;
+ if (size < prec)
+ size = prec;
+ size += sign;
+ pad = width - size;
+ if (flushleft == 0) {
+ while (--pad >= 0)
+ outc(' ', dest);
+ }
+ }
+ if (sign)
+ outc('-', dest);
+ prec -= len;
+ while (--prec >= 0)
+ outc('0', dest);
+ while (*p)
+ outc(*p++, dest);
+ while (--pad >= 0)
+ outc(' ', dest);
+ break;
+ case 's':
+ p = va_arg(ap, char *);
+ pad = 0;
+ if (width) {
+ len = strlen(p);
+ if (prec >= 0 && len > prec)
+ len = prec;
+ pad = width - len;
+ if (flushleft == 0) {
+ while (--pad >= 0)
+ outc(' ', dest);
+ }
+ }
+ prec++;
+ while (--prec != 0 && *p)
+ outc(*p++, dest);
+ while (--pad >= 0)
+ outc(' ', dest);
+ break;
+ case 'c':
+ c = va_arg(ap, int);
+ outc(c, dest);
+ break;
+ default:
+ outc(*f, dest);
+ break;
+ }
+ f++;
+ }
+#endif /* !HAVE_VASPRINTF */
+}
+#endif
+
+
+
+/*
+ * Version of write which resumes after a signal is caught.
+ */
+
+static int
+xwrite(fd, buf, nbytes)
+ int fd;
+ const char *buf;
+ int nbytes;
+ {
+ int ntry;
+ int i;
+ int n;
+
+ n = nbytes;
+ ntry = 0;
+ for (;;) {
+ i = write(fd, buf, n);
+ if (i > 0) {
+ if ((n -= i) <= 0)
+ return nbytes;
+ buf += i;
+ ntry = 0;
+ } else if (i == 0) {
+ if (++ntry > 10)
+ return nbytes - n;
+ } else if (errno != EINTR) {
+ return -1;
+ }
+ }
+}
+
+
+#ifdef notdef
+/*
+ * Version of ioctl that retries after a signal is caught.
+ * XXX unused function
+ */
+
+static int
+xioctl(fd, request, arg)
+ int fd;
+ unsigned long request;
+ char * arg;
+{
+ int i;
+
+ while ((i = ioctl(fd, request, arg)) == -1 && errno == EINTR);
+ return i;
+}
+#endif
+
+
+#ifdef USE_GLIBC_STDIO
+static void initstreams() {
+ output.stream = stdout;
+ errout.stream = stderr;
+}
+
+
+static void
+openmemout() {
+ INTOFF;
+ memout.stream = open_memstream(&memout.buf, &memout.bufsize);
+ INTON;
+}
+
+
+static int
+__closememout() {
+ int error;
+ error = fclose(memout.stream);
+ memout.stream = NULL;
+ return error;
+}
+#endif
+/* $NetBSD: parser.c,v 1.46 2001/02/04 19:52:06 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+/*
+ * Shell command parser.
+ */
+
+#define EOFMARKLEN 79
+
+
+
+struct heredoc {
+ struct heredoc *next; /* next here document in list */
+ union node *here; /* redirection node */
+ char *eofmark; /* string indicating end of input */
+ int striptabs; /* if set, strip leading tabs */
+};
+
+
+
+struct heredoc *heredoclist; /* list of here documents to read */
+static int parsebackquote; /* nonzero if we are inside backquotes */
+static int doprompt; /* if set, prompt the user */
+static int needprompt; /* true if interactive and at start of line */
+static int lasttoken; /* last token read */
+static int tokpushback; /* last token pushed back */
+static char *wordtext; /* text of last word returned by readtoken */
+static int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
+/* 1 == check for aliases, 2 == also check for assignments */
+static int checkalias;
+struct nodelist *backquotelist;
+union node *redirnode;
+struct heredoc *heredoc;
+static int quoteflag; /* set if (part of) last token was quoted */
+static int startlinno; /* line # where last token started */
+
+
+static union node *list __P((int));
+static union node *andor __P((void));
+static union node *pipeline __P((void));
+static union node *command __P((void));
+static union node *simplecmd __P((void));
+static union node *makename __P((void));
+static void parsefname __P((void));
+static void parseheredoc __P((void));
+static int peektoken __P((void));
+static int readtoken __P((void));
+static int xxreadtoken __P((void));
+static int readtoken1 __P((int, char const *, char *, int));
+static int noexpand __P((char *));
+static void synexpect __P((int)) __attribute__((noreturn));
+static void synerror __P((const char *)) __attribute__((noreturn));
+static void setprompt __P((int));
+
+
+/*
+ * Read and parse a command. Returns NEOF on end of file. (NULL is a
+ * valid parse tree indicating a blank line.)
+ */
+
+union node *
+parsecmd(int interact)
+{
+ int t;
+
+ tokpushback = 0;
+ doprompt = interact;
+ if (doprompt)
+ setprompt(1);
+ else
+ setprompt(0);
+ needprompt = 0;
+ t = readtoken();
+ if (t == TEOF)
+ return NEOF;
+ if (t == TNL)
+ return NULL;
+ tokpushback++;
+ return list(1);
+}
+
+
+static union node *
+list(nlflag)
+ int nlflag;
+{
+ union node *n1, *n2, *n3;
+ int tok;
+
+ checkkwd = 2;
+ if (nlflag == 0 && tokendlist[peektoken()])
+ return NULL;
+ n1 = NULL;
+ for (;;) {
+ n2 = andor();
+ tok = readtoken();
+ if (tok == TBACKGND) {
+ if (n2->type == NCMD || n2->type == NPIPE) {
+ n2->ncmd.backgnd = 1;
+ } else if (n2->type == NREDIR) {
+ n2->type = NBACKGND;
+ } else {
+ n3 = (union node *)stalloc(sizeof (struct nredir));
+ n3->type = NBACKGND;
+ n3->nredir.n = n2;
+ n3->nredir.redirect = NULL;
+ n2 = n3;
+ }
+ }
+ if (n1 == NULL) {
+ n1 = n2;
+ }
+ else {
+ n3 = (union node *)stalloc(sizeof (struct nbinary));
+ n3->type = NSEMI;
+ n3->nbinary.ch1 = n1;
+ n3->nbinary.ch2 = n2;
+ n1 = n3;
+ }
+ switch (tok) {
+ case TBACKGND:
+ case TSEMI:
+ tok = readtoken();
+ /* fall through */
+ case TNL:
+ if (tok == TNL) {
+ parseheredoc();
+ if (nlflag)
+ return n1;
+ } else {
+ tokpushback++;
+ }
+ checkkwd = 2;
+ if (tokendlist[peektoken()])
+ return n1;
+ break;
+ case TEOF:
+ if (heredoclist)
+ parseheredoc();
+ else
+ pungetc(); /* push back EOF on input */
+ return n1;
+ default:
+ if (nlflag)
+ synexpect(-1);
+ tokpushback++;
+ return n1;
+ }
+ }
+}
+
+
+
+static union node *
+andor() {
+ union node *n1, *n2, *n3;
+ int t;
+
+ checkkwd = 1;
+ n1 = pipeline();
+ for (;;) {
+ if ((t = readtoken()) == TAND) {
+ t = NAND;
+ } else if (t == TOR) {
+ t = NOR;
+ } else {
+ tokpushback++;
+ return n1;
+ }
+ checkkwd = 2;
+ n2 = pipeline();
+ n3 = (union node *)stalloc(sizeof (struct nbinary));
+ n3->type = t;
+ n3->nbinary.ch1 = n1;
+ n3->nbinary.ch2 = n2;
+ n1 = n3;
+ }
+}
+
+
+
+static union node *
+pipeline() {
+ union node *n1, *n2, *pipenode;
+ struct nodelist *lp, *prev;
+ int negate;
+
+ negate = 0;
+ TRACE(("pipeline: entered\n"));
+ if (readtoken() == TNOT) {
+ negate = !negate;
+ checkkwd = 1;
+ } else
+ tokpushback++;
+ n1 = command();
+ if (readtoken() == TPIPE) {
+ pipenode = (union node *)stalloc(sizeof (struct npipe));
+ pipenode->type = NPIPE;
+ pipenode->npipe.backgnd = 0;
+ lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
+ pipenode->npipe.cmdlist = lp;
+ lp->n = n1;
+ do {
+ prev = lp;
+ lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
+ checkkwd = 2;
+ lp->n = command();
+ prev->next = lp;
+ } while (readtoken() == TPIPE);
+ lp->next = NULL;
+ n1 = pipenode;
+ }
+ tokpushback++;
+ if (negate) {
+ n2 = (union node *)stalloc(sizeof (struct nnot));
+ n2->type = NNOT;
+ n2->nnot.com = n1;
+ return n2;
+ } else
+ return n1;
+}
+
+
+
+static union node *
+command() {
+ union node *n1, *n2;
+ union node *ap, **app;
+ union node *cp, **cpp;
+ union node *redir, **rpp;
+ int t;
+
+ redir = NULL;
+ n1 = NULL;
+ rpp = &redir;
+
+ switch (readtoken()) {
+ case TIF:
+ n1 = (union node *)stalloc(sizeof (struct nif));
+ n1->type = NIF;
+ n1->nif.test = list(0);
+ if (readtoken() != TTHEN)
+ synexpect(TTHEN);
+ n1->nif.ifpart = list(0);
+ n2 = n1;
+ while (readtoken() == TELIF) {
+ n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
+ n2 = n2->nif.elsepart;
+ n2->type = NIF;
+ n2->nif.test = list(0);
+ if (readtoken() != TTHEN)
+ synexpect(TTHEN);
+ n2->nif.ifpart = list(0);
+ }
+ if (lasttoken == TELSE)
+ n2->nif.elsepart = list(0);
+ else {
+ n2->nif.elsepart = NULL;
+ tokpushback++;
+ }
+ if (readtoken() != TFI)
+ synexpect(TFI);
+ checkkwd = 1;
+ break;
+ case TWHILE:
+ case TUNTIL: {
+ int got;
+ n1 = (union node *)stalloc(sizeof (struct nbinary));
+ n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
+ n1->nbinary.ch1 = list(0);
+ if ((got=readtoken()) != TDO) {
+TRACE(("expecting DO got %s %s\n", tokname[got], got == TWORD ? wordtext : ""));
+ synexpect(TDO);
+ }
+ n1->nbinary.ch2 = list(0);
+ if (readtoken() != TDONE)
+ synexpect(TDONE);
+ checkkwd = 1;
+ break;
+ }
+ case TFOR:
+ if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
+ synerror("Bad for loop variable");
+ n1 = (union node *)stalloc(sizeof (struct nfor));
+ n1->type = NFOR;
+ n1->nfor.var = wordtext;
+ checkkwd = 1;
+ if (readtoken() == TIN) {
+ app = ≈
+ while (readtoken() == TWORD) {
+ n2 = (union node *)stalloc(sizeof (struct narg));
+ n2->type = NARG;
+ n2->narg.text = wordtext;
+ n2->narg.backquote = backquotelist;
+ *app = n2;
+ app = &n2->narg.next;
+ }
+ *app = NULL;
+ n1->nfor.args = ap;
+ if (lasttoken != TNL && lasttoken != TSEMI)
+ synexpect(-1);
+ } else {
+ static char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE,
+ '@', '=', '\0'};
+ n2 = (union node *)stalloc(sizeof (struct narg));
+ n2->type = NARG;
+ n2->narg.text = argvars;
+ n2->narg.backquote = NULL;
+ n2->narg.next = NULL;
+ n1->nfor.args = n2;
+ /*
+ * Newline or semicolon here is optional (but note
+ * that the original Bourne shell only allowed NL).
+ */
+ if (lasttoken != TNL && lasttoken != TSEMI)
+ tokpushback++;
+ }
+ checkkwd = 2;
+ if (readtoken() != TDO)
+ synexpect(TDO);
+ n1->nfor.body = list(0);
+ if (readtoken() != TDONE)
+ synexpect(TDONE);
+ checkkwd = 1;
+ break;
+ case TCASE:
+ n1 = (union node *)stalloc(sizeof (struct ncase));
+ n1->type = NCASE;
+ if (readtoken() != TWORD)
+ synexpect(TWORD);
+ n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
+ n2->type = NARG;
+ n2->narg.text = wordtext;
+ n2->narg.backquote = backquotelist;
+ n2->narg.next = NULL;
+ do {
+ checkkwd = 1;
+ } while (readtoken() == TNL);
+ if (lasttoken != TIN)
+ synerror("expecting \"in\"");
+ cpp = &n1->ncase.cases;
+ checkkwd = 2, readtoken();
+ do {
+ if (lasttoken == TLP)
+ readtoken();
+ *cpp = cp = (union node *)stalloc(sizeof (struct nclist));
+ cp->type = NCLIST;
+ app = &cp->nclist.pattern;
+ for (;;) {
+ *app = ap = (union node *)stalloc(sizeof (struct narg));
+ ap->type = NARG;
+ ap->narg.text = wordtext;
+ ap->narg.backquote = backquotelist;
+ if (checkkwd = 2, readtoken() != TPIPE)
+ break;
+ app = &ap->narg.next;
+ readtoken();
+ }
+ ap->narg.next = NULL;
+ if (lasttoken != TRP)
+ synexpect(TRP);
+ cp->nclist.body = list(0);
+
+ checkkwd = 2;
+ if ((t = readtoken()) != TESAC) {
+ if (t != TENDCASE)
+ synexpect(TENDCASE);
+ else
+ checkkwd = 2, readtoken();
+ }
+ cpp = &cp->nclist.next;
+ } while(lasttoken != TESAC);
+ *cpp = NULL;
+ checkkwd = 1;
+ break;
+ case TLP:
+ n1 = (union node *)stalloc(sizeof (struct nredir));
+ n1->type = NSUBSHELL;
+ n1->nredir.n = list(0);
+ n1->nredir.redirect = NULL;
+ if (readtoken() != TRP)
+ synexpect(TRP);
+ checkkwd = 1;
+ break;
+ case TBEGIN:
+ n1 = list(0);
+ if (readtoken() != TEND)
+ synexpect(TEND);
+ checkkwd = 1;
+ break;
+ /* Handle an empty command like other simple commands. */
+ case TSEMI:
+ case TAND:
+ case TOR:
+ case TNL:
+ case TEOF:
+ case TRP:
+ case TBACKGND:
+ /*
+ * An empty command before a ; doesn't make much sense, and
+ * should certainly be disallowed in the case of `if ;'.
+ */
+ if (!redir)
+ synexpect(-1);
+ case TWORD:
+ case TREDIR:
+ tokpushback++;
+ n1 = simplecmd();
+ return n1;
+ default:
+ synexpect(-1);
+ /* NOTREACHED */
+ }
+
+ /* Now check for redirection which may follow command */
+ while (readtoken() == TREDIR) {
+ *rpp = n2 = redirnode;
+ rpp = &n2->nfile.next;
+ parsefname();
+ }
+ tokpushback++;
+ *rpp = NULL;
+ if (redir) {
+ if (n1->type != NSUBSHELL) {
+ n2 = (union node *)stalloc(sizeof (struct nredir));
+ n2->type = NREDIR;
+ n2->nredir.n = n1;
+ n1 = n2;
+ }
+ n1->nredir.redirect = redir;
+ }
+
+ return n1;
+}
+
+
+static union node *
+simplecmd() {
+ union node *args, **app;
+ union node *n = NULL;
+ union node *vars, **vpp;
+ union node **rpp, *redir;
+
+ args = NULL;
+ app = &args;
+ vars = NULL;
+ vpp = &vars;
+ redir = NULL;
+ rpp = &redir;
+
+ checkalias = 2;
+ for (;;) {
+ switch (readtoken()) {
+ case TWORD:
+ case TASSIGN:
+ n = (union node *)stalloc(sizeof (struct narg));
+ n->type = NARG;
+ n->narg.text = wordtext;
+ n->narg.backquote = backquotelist;
+ if (lasttoken == TWORD) {
+ *app = n;
+ app = &n->narg.next;
+ } else {
+ *vpp = n;
+ vpp = &n->narg.next;
+ }
+ break;
+ case TREDIR:
+ *rpp = n = redirnode;
+ rpp = &n->nfile.next;
+ parsefname(); /* read name of redirection file */
+ break;
+ case TLP:
+ if (
+ args && app == &args->narg.next &&
+ !vars && !redir
+ ) {
+ /* We have a function */
+ if (readtoken() != TRP)
+ synexpect(TRP);
+#ifdef notdef
+ if (! goodname(n->narg.text))
+ synerror("Bad function name");
+#endif
+ n->type = NDEFUN;
+ checkkwd = 2;
+ n->narg.next = command();
+ return n;
+ }
+ /* fall through */
+ default:
+ tokpushback++;
+ goto out;
+ }
+ }
+out:
+ *app = NULL;
+ *vpp = NULL;
+ *rpp = NULL;
+ n = (union node *)stalloc(sizeof (struct ncmd));
+ n->type = NCMD;
+ n->ncmd.backgnd = 0;
+ n->ncmd.args = args;
+ n->ncmd.assign = vars;
+ n->ncmd.redirect = redir;
+ return n;
+}
+
+static union node *
+makename() {
+ union node *n;
+
+ n = (union node *)stalloc(sizeof (struct narg));
+ n->type = NARG;
+ n->narg.next = NULL;
+ n->narg.text = wordtext;
+ n->narg.backquote = backquotelist;
+ return n;
+}
+
+static void fixredir(union node *n, const char *text, int err)
+ {
+ TRACE(("Fix redir %s %d\n", text, err));
+ if (!err)
+ n->ndup.vname = NULL;
+
+ if (is_digit(text[0]) && text[1] == '\0')
+ n->ndup.dupfd = digit_val(text[0]);
+ else if (text[0] == '-' && text[1] == '\0')
+ n->ndup.dupfd = -1;
+ else {
+
+ if (err)
+ synerror("Bad fd number");
+ else
+ n->ndup.vname = makename();
+ }
+}
+
+
+static void
+parsefname() {
+ union node *n = redirnode;
+
+ if (readtoken() != TWORD)
+ synexpect(-1);
+ if (n->type == NHERE) {
+ struct heredoc *here = heredoc;
+ struct heredoc *p;
+ int i;
+
+ if (quoteflag == 0)
+ n->type = NXHERE;
+ TRACE(("Here document %d\n", n->type));
+ if (here->striptabs) {
+ while (*wordtext == '\t')
+ wordtext++;
+ }
+ if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
+ synerror("Illegal eof marker for << redirection");
+ rmescapes(wordtext);
+ here->eofmark = wordtext;
+ here->next = NULL;
+ if (heredoclist == NULL)
+ heredoclist = here;
+ else {
+ for (p = heredoclist ; p->next ; p = p->next);
+ p->next = here;
+ }
+ } else if (n->type == NTOFD || n->type == NFROMFD) {
+ fixredir(n, wordtext, 0);
+ } else {
+ n->nfile.fname = makename();
+ }
+}
+
+
+/*
+ * Input any here documents.
+ */
+
+static void
+parseheredoc() {
+ struct heredoc *here;
+ union node *n;
+
+ while (heredoclist) {
+ here = heredoclist;
+ heredoclist = here->next;
+ if (needprompt) {
+ setprompt(2);
+ needprompt = 0;
+ }
+ readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
+ here->eofmark, here->striptabs);
+ n = (union node *)stalloc(sizeof (struct narg));
+ n->narg.type = NARG;
+ n->narg.next = NULL;
+ n->narg.text = wordtext;
+ n->narg.backquote = backquotelist;
+ here->here->nhere.doc = n;
+ }
+}
+
+static int
+peektoken() {
+ int t;
+
+ t = readtoken();
+ tokpushback++;
+ return (t);
+}
+
+static int
+readtoken() {
+ int t;
+ int savecheckkwd = checkkwd;
+ int savecheckalias = checkalias;
+ struct alias *ap;
+#ifdef DEBUG
+ int alreadyseen = tokpushback;
+#endif
+
+top:
+ t = xxreadtoken();
+ checkalias = savecheckalias;
+
+ if (checkkwd) {
+ /*
+ * eat newlines
+ */
+ if (checkkwd == 2) {
+ checkkwd = 0;
+ while (t == TNL) {
+ parseheredoc();
+ t = xxreadtoken();
+ }
+ }
+ checkkwd = 0;
+ /*
+ * check for keywords
+ */
+ if (t == TWORD && !quoteflag)
+ {
+ const char *const *pp;
+
+ if ((pp = findkwd(wordtext))) {
+ lasttoken = t = pp - parsekwd + KWDOFFSET;
+ TRACE(("keyword %s recognized\n", tokname[t]));
+ goto out;
+ }
+ }
+ }
+
+ if (t != TWORD) {
+ if (t != TREDIR) {
+ checkalias = 0;
+ }
+ } else if (checkalias == 2 && isassignment(wordtext)) {
+ lasttoken = t = TASSIGN;
+ } else if (checkalias) {
+ if (!quoteflag && (ap = lookupalias(wordtext, 1)) != NULL) {
+ if (*ap->val) {
+ pushstring(ap->val, strlen(ap->val), ap);
+ }
+ checkkwd = savecheckkwd;
+ goto top;
+ }
+ checkalias = 0;
+ }
+out:
+#ifdef DEBUG
+ if (!alreadyseen)
+ TRACE(("token %s %s\n", tokname[t], t == TWORD || t == TASSIGN ? wordtext : ""));
+ else
+ TRACE(("reread token %s %s\n", tokname[t], t == TWORD || t == TASSIGN ? wordtext : ""));
+#endif
+ return (t);
+}
+
+
+/*
+ * Read the next input token.
+ * If the token is a word, we set backquotelist to the list of cmds in
+ * backquotes. We set quoteflag to true if any part of the word was
+ * quoted.
+ * If the token is TREDIR, then we set redirnode to a structure containing
+ * the redirection.
+ * In all cases, the variable startlinno is set to the number of the line
+ * on which the token starts.
+ *
+ * [Change comment: here documents and internal procedures]
+ * [Readtoken shouldn't have any arguments. Perhaps we should make the
+ * word parsing code into a separate routine. In this case, readtoken
+ * doesn't need to have any internal procedures, but parseword does.
+ * We could also make parseoperator in essence the main routine, and
+ * have parseword (readtoken1?) handle both words and redirection.]
+ */
+
+#define RETURN(token) return lasttoken = token
+
+static int
+xxreadtoken() {
+ int c;
+
+ if (tokpushback) {
+ tokpushback = 0;
+ return lasttoken;
+ }
+ if (needprompt) {
+ setprompt(2);
+ needprompt = 0;
+ }
+ startlinno = plinno;
+ for (;;) { /* until token or start of word found */
+ c = pgetc_macro();
+ switch (c) {
+ case ' ': case '\t':
+ case PEOA:
+ continue;
+ case '#':
+ while ((c = pgetc()) != '\n' && c != PEOF);
+ pungetc();
+ continue;
+ case '\\':
+ if (pgetc() == '\n') {
+ startlinno = ++plinno;
+ if (doprompt)
+ setprompt(2);
+ else
+ setprompt(0);
+ continue;
+ }
+ pungetc();
+ goto breakloop;
+ case '\n':
+ plinno++;
+ needprompt = doprompt;
+ RETURN(TNL);
+ case PEOF:
+ RETURN(TEOF);
+ case '&':
+ if (pgetc() == '&')
+ RETURN(TAND);
+ pungetc();
+ RETURN(TBACKGND);
+ case '|':
+ if (pgetc() == '|')
+ RETURN(TOR);
+ pungetc();
+ RETURN(TPIPE);
+ case ';':
+ if (pgetc() == ';')
+ RETURN(TENDCASE);
+ pungetc();
+ RETURN(TSEMI);
+ case '(':
+ RETURN(TLP);
+ case ')':
+ RETURN(TRP);
+ default:
+ goto breakloop;
+ }
+ }
+breakloop:
+ return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
+#undef RETURN
+}
+
+
+
+/*
+ * If eofmark is NULL, read a word or a redirection symbol. If eofmark
+ * is not NULL, read a here document. In the latter case, eofmark is the
+ * word which marks the end of the document and striptabs is true if
+ * leading tabs should be stripped from the document. The argument firstc
+ * is the first character of the input token or document.
+ *
+ * Because C does not have internal subroutines, I have simulated them
+ * using goto's to implement the subroutine linkage. The following macros
+ * will run code that appears at the end of readtoken1.
+ */
+
+#define CHECKEND() {goto checkend; checkend_return:;}
+#define PARSEREDIR() {goto parseredir; parseredir_return:;}
+#define PARSESUB() {goto parsesub; parsesub_return:;}
+#define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
+#define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
+#define PARSEARITH() {goto parsearith; parsearith_return:;}
+
+static int
+readtoken1(firstc, syntax, eofmark, striptabs)
+ int firstc;
+ char const *syntax;
+ char *eofmark;
+ int striptabs;
+ {
+ int c = firstc;
+ char *out;
+ int len;
+ char line[EOFMARKLEN + 1];
+ struct nodelist *bqlist;
+ int quotef;
+ int dblquote;
+ int varnest; /* levels of variables expansion */
+ int arinest; /* levels of arithmetic expansion */
+ int parenlevel; /* levels of parens in arithmetic */
+ int dqvarnest; /* levels of variables expansion within double quotes */
+ int oldstyle;
+ char const *prevsyntax; /* syntax before arithmetic */
+#if __GNUC__
+ /* Avoid longjmp clobbering */
+ (void) &out;
+ (void) "ef;
+ (void) &dblquote;
+ (void) &varnest;
+ (void) &arinest;
+ (void) &parenlevel;
+ (void) &dqvarnest;
+ (void) &oldstyle;
+ (void) &prevsyntax;
+ (void) &syntax;
+#endif
+
+ startlinno = plinno;
+ dblquote = 0;
+ if (syntax == DQSYNTAX)
+ dblquote = 1;
+ quotef = 0;
+ bqlist = NULL;
+ varnest = 0;
+ arinest = 0;
+ parenlevel = 0;
+ dqvarnest = 0;
+
+ STARTSTACKSTR(out);
+ loop: { /* for each line, until end of word */
+#if ATTY
+ if (c == '\034' && doprompt
+ && attyset() && ! equal(termval(), "emacs")) {
+ attyline();
+ if (syntax == BASESYNTAX)
+ return readtoken();
+ c = pgetc();
+ goto loop;
+ }
+#endif
+ CHECKEND(); /* set c to PEOF if at end of here document */
+ for (;;) { /* until end of line or end of word */
+ CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */
+ switch(syntax[c]) {
+ case CNL: /* '\n' */
+ if (syntax == BASESYNTAX)
+ goto endword; /* exit outer loop */
+ USTPUTC(c, out);
+ plinno++;
+ if (doprompt)
+ setprompt(2);
+ else
+ setprompt(0);
+ c = pgetc();
+ goto loop; /* continue outer loop */
+ case CWORD:
+ USTPUTC(c, out);
+ break;
+ case CCTL:
+ if ((eofmark == NULL || dblquote) &&
+ dqvarnest == 0)
+ USTPUTC(CTLESC, out);
+ USTPUTC(c, out);
+ break;
+ case CBACK: /* backslash */
+ c = pgetc2();
+ if (c == PEOF) {
+ USTPUTC('\\', out);
+ pungetc();
+ } else if (c == '\n') {
+ if (doprompt)
+ setprompt(2);
+ else
+ setprompt(0);
+ } else {
+ if (dblquote && c != '\\' && c != '`' && c != '$'
+ && (c != '"' || eofmark != NULL))
+ USTPUTC('\\', out);
+ if (SQSYNTAX[c] == CCTL)
+ USTPUTC(CTLESC, out);
+ else if (eofmark == NULL)
+ USTPUTC(CTLQUOTEMARK, out);
+ USTPUTC(c, out);
+ quotef++;
+ }
+ break;
+ case CSQUOTE:
+ if (eofmark == NULL)
+ USTPUTC(CTLQUOTEMARK, out);
+ syntax = SQSYNTAX;
+ break;
+ case CDQUOTE:
+ if (eofmark == NULL)
+ USTPUTC(CTLQUOTEMARK, out);
+ syntax = DQSYNTAX;
+ dblquote = 1;
+ break;
+ case CENDQUOTE:
+ if (eofmark != NULL && arinest == 0 &&
+ varnest == 0) {
+ USTPUTC(c, out);
+ } else {
+ if (arinest) {
+ syntax = ARISYNTAX;
+ dblquote = 0;
+ } else if (eofmark == NULL &&
+ dqvarnest == 0) {
+ syntax = BASESYNTAX;
+ dblquote = 0;
+ }
+ quotef++;
+ }
+ break;
+ case CVAR: /* '$' */
+ PARSESUB(); /* parse substitution */
+ break;
+ case CENDVAR: /* '}' */
+ if (varnest > 0) {
+ varnest--;
+ if (dqvarnest > 0) {
+ dqvarnest--;
+ }
+ USTPUTC(CTLENDVAR, out);
+ } else {
+ USTPUTC(c, out);
+ }
+ break;
+#ifdef ASH_MATH_SUPPORT
+ case CLP: /* '(' in arithmetic */
+ parenlevel++;
+ USTPUTC(c, out);
+ break;
+ case CRP: /* ')' in arithmetic */
+ if (parenlevel > 0) {
+ USTPUTC(c, out);
+ --parenlevel;
+ } else {
+ if (pgetc() == ')') {
+ if (--arinest == 0) {
+ USTPUTC(CTLENDARI, out);
+ syntax = prevsyntax;
+ if (syntax == DQSYNTAX)
+ dblquote = 1;
+ else
+ dblquote = 0;
+ } else
+ USTPUTC(')', out);
+ } else {
+ /*
+ * unbalanced parens
+ * (don't 2nd guess - no error)
+ */
+ pungetc();
+ USTPUTC(')', out);
+ }
+ }
+ break;
+#endif
+ case CBQUOTE: /* '`' */
+ PARSEBACKQOLD();
+ break;
+ case CEOF:
+ goto endword; /* exit outer loop */
+ case CIGN:
+ break;
+ default:
+ if (varnest == 0)
+ goto endword; /* exit outer loop */
+ if (c != PEOA) {
+ USTPUTC(c, out);
+ }
+ }
+ c = pgetc_macro();
+ }
+ }
+endword:
+ if (syntax == ARISYNTAX)
+ synerror("Missing '))'");
+ if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
+ synerror("Unterminated quoted string");
+ if (varnest != 0) {
+ startlinno = plinno;
+ synerror("Missing '}'");
+ }
+ USTPUTC('\0', out);
+ len = out - stackblock();
+ out = stackblock();
+ if (eofmark == NULL) {
+ if ((c == '>' || c == '<')
+ && quotef == 0
+ && len <= 2
+ && (*out == '\0' || is_digit(*out))) {
+ PARSEREDIR();
+ return lasttoken = TREDIR;
+ } else {
+ pungetc();
+ }
+ }
+ quoteflag = quotef;
+ backquotelist = bqlist;
+ grabstackblock(len);
+ wordtext = out;
+ return lasttoken = TWORD;
+/* end of readtoken routine */
+
+
+
+/*
+ * Check to see whether we are at the end of the here document. When this
+ * is called, c is set to the first character of the next input line. If
+ * we are at the end of the here document, this routine sets the c to PEOF.
+ */
+
+checkend: {
+ if (eofmark) {
+ if (c == PEOA) {
+ c = pgetc2();
+ }
+ if (striptabs) {
+ while (c == '\t') {
+ c = pgetc2();
+ }
+ }
+ if (c == *eofmark) {
+ if (pfgets(line, sizeof line) != NULL) {
+ char *p, *q;
+
+ p = line;
+ for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
+ if (*p == '\n' && *q == '\0') {
+ c = PEOF;
+ plinno++;
+ needprompt = doprompt;
+ } else {
+ pushstring(line, strlen(line), NULL);
+ }
+ }
+ }
+ }
+ goto checkend_return;
+}
+
+
+/*
+ * Parse a redirection operator. The variable "out" points to a string
+ * specifying the fd to be redirected. The variable "c" contains the
+ * first character of the redirection operator.
+ */
+
+parseredir: {
+ char fd = *out;
+ union node *np;
+
+ np = (union node *)stalloc(sizeof (struct nfile));
+ if (c == '>') {
+ np->nfile.fd = 1;
+ c = pgetc();
+ if (c == '>')
+ np->type = NAPPEND;
+ else if (c == '&')
+ np->type = NTOFD;
+ else if (c == '|')
+ np->type = NTOOV;
+ else {
+ np->type = NTO;
+ pungetc();
+ }
+ } else { /* c == '<' */
+ np->nfile.fd = 0;
+ switch (c = pgetc()) {
+ case '<':
+ if (sizeof (struct nfile) != sizeof (struct nhere)) {
+ np = (union node *)stalloc(sizeof (struct nhere));
+ np->nfile.fd = 0;
+ }
+ np->type = NHERE;
+ heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
+ heredoc->here = np;
+ if ((c = pgetc()) == '-') {
+ heredoc->striptabs = 1;
+ } else {
+ heredoc->striptabs = 0;
+ pungetc();
+ }
+ break;
+
+ case '&':
+ np->type = NFROMFD;
+ break;
+
+ case '>':
+ np->type = NFROMTO;
+ break;
+
+ default:
+ np->type = NFROM;
+ pungetc();
+ break;
+ }
+ }
+ if (fd != '\0')
+ np->nfile.fd = digit_val(fd);
+ redirnode = np;
+ goto parseredir_return;
+}
+
+
+/*
+ * Parse a substitution. At this point, we have read the dollar sign
+ * and nothing else.
+ */
+
+parsesub: {
+ int subtype;
+ int typeloc;
+ int flags;
+ char *p;
+ static const char types[] = "}-+?=";
+
+ c = pgetc();
+ if (
+ c <= PEOA ||
+ (c != '(' && c != '{' && !is_name(c) && !is_special(c))
+ ) {
+ USTPUTC('$', out);
+ pungetc();
+ } else if (c == '(') { /* $(command) or $((arith)) */
+ if (pgetc() == '(') {
+ PARSEARITH();
+ } else {
+ pungetc();
+ PARSEBACKQNEW();
+ }
+ } else {
+ USTPUTC(CTLVAR, out);
+ typeloc = out - stackblock();
+ USTPUTC(VSNORMAL, out);
+ subtype = VSNORMAL;
+ if (c == '{') {
+ c = pgetc();
+ if (c == '#') {
+ if ((c = pgetc()) == '}')
+ c = '#';
+ else
+ subtype = VSLENGTH;
+ }
+ else
+ subtype = 0;
+ }
+ if (c > PEOA && is_name(c)) {
+ do {
+ STPUTC(c, out);
+ c = pgetc();
+ } while (c > PEOA && is_in_name(c));
+ } else if (is_digit(c)) {
+ do {
+ USTPUTC(c, out);
+ c = pgetc();
+ } while (is_digit(c));
+ }
+ else if (is_special(c)) {
+ USTPUTC(c, out);
+ c = pgetc();
+ }
+ else
+badsub: synerror("Bad substitution");
+
+ STPUTC('=', out);
+ flags = 0;
+ if (subtype == 0) {
+ switch (c) {
+ case ':':
+ flags = VSNUL;
+ c = pgetc();
+ /*FALLTHROUGH*/
+ default:
+ p = strchr(types, c);
+ if (p == NULL)
+ goto badsub;
+ subtype = p - types + VSNORMAL;
+ break;
+ case '%':
+ case '#':
+ {
+ int cc = c;
+ subtype = c == '#' ? VSTRIMLEFT :
+ VSTRIMRIGHT;
+ c = pgetc();
+ if (c == cc)
+ subtype++;
+ else
+ pungetc();
+ break;
+ }
+ }
+ } else {
+ pungetc();
+ }
+ if (dblquote || arinest)
+ flags |= VSQUOTE;
+ *(stackblock() + typeloc) = subtype | flags;
+ if (subtype != VSNORMAL) {
+ varnest++;
+ if (dblquote) {
+ dqvarnest++;
+ }
+ }
+ }
+ goto parsesub_return;
+}
+
+
+/*
+ * Called to parse command substitutions. Newstyle is set if the command
+ * is enclosed inside $(...); nlpp is a pointer to the head of the linked
+ * list of commands (passed by reference), and savelen is the number of
+ * characters on the top of the stack which must be preserved.
+ */
+
+parsebackq: {
+ struct nodelist **nlpp;
+ int savepbq;
+ union node *n;
+ char *volatile str;
+ struct jmploc jmploc;
+ struct jmploc *volatile savehandler;
+ int savelen;
+ int saveprompt;
+#ifdef __GNUC__
+ (void) &saveprompt;
+#endif
+
+ savepbq = parsebackquote;
+ if (setjmp(jmploc.loc)) {
+ if (str)
+ ckfree(str);
+ parsebackquote = 0;
+ handler = savehandler;
+ longjmp(handler->loc, 1);
+ }
+ INTOFF;
+ str = NULL;
+ savelen = out - stackblock();
+ if (savelen > 0) {
+ str = ckmalloc(savelen);
+ memcpy(str, stackblock(), savelen);
+ }
+ savehandler = handler;
+ handler = &jmploc;
+ INTON;
+ if (oldstyle) {
+ /* We must read until the closing backquote, giving special
+ treatment to some slashes, and then push the string and
+ reread it as input, interpreting it normally. */
+ char *pout;
+ int pc;
+ int psavelen;
+ char *pstr;
+
+
+ STARTSTACKSTR(pout);
+ for (;;) {
+ if (needprompt) {
+ setprompt(2);
+ needprompt = 0;
+ }
+ switch (pc = pgetc()) {
+ case '`':
+ goto done;
+
+ case '\\':
+ if ((pc = pgetc()) == '\n') {
+ plinno++;
+ if (doprompt)
+ setprompt(2);
+ else
+ setprompt(0);
+ /*
+ * If eating a newline, avoid putting
+ * the newline into the new character
+ * stream (via the STPUTC after the
+ * switch).
+ */
+ continue;
+ }
+ if (pc != '\\' && pc != '`' && pc != '$'
+ && (!dblquote || pc != '"'))
+ STPUTC('\\', pout);
+ if (pc > PEOA) {
+ break;
+ }
+ /* fall through */
+
+ case PEOF:
+ case PEOA:
+ startlinno = plinno;
+ synerror("EOF in backquote substitution");
+
+ case '\n':
+ plinno++;
+ needprompt = doprompt;
+ break;
+
+ default:
+ break;
+ }
+ STPUTC(pc, pout);
+ }
+done:
+ STPUTC('\0', pout);
+ psavelen = pout - stackblock();
+ if (psavelen > 0) {
+ pstr = grabstackstr(pout);
+ setinputstring(pstr);
+ }
+ }
+ nlpp = &bqlist;
+ while (*nlpp)
+ nlpp = &(*nlpp)->next;
+ *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
+ (*nlpp)->next = NULL;
+ parsebackquote = oldstyle;
+
+ if (oldstyle) {
+ saveprompt = doprompt;
+ doprompt = 0;
+ }
+
+ n = list(0);
+
+ if (oldstyle)
+ doprompt = saveprompt;
+ else {
+ if (readtoken() != TRP)
+ synexpect(TRP);
+ }
+
+ (*nlpp)->n = n;
+ if (oldstyle) {
+ /*
+ * Start reading from old file again, ignoring any pushed back
+ * tokens left from the backquote parsing
+ */
+ popfile();
+ tokpushback = 0;
+ }
+ while (stackblocksize() <= savelen)
+ growstackblock();
+ STARTSTACKSTR(out);
+ if (str) {
+ memcpy(out, str, savelen);
+ STADJUST(savelen, out);
+ INTOFF;
+ ckfree(str);
+ str = NULL;
+ INTON;
+ }
+ parsebackquote = savepbq;
+ handler = savehandler;
+ if (arinest || dblquote)
+ USTPUTC(CTLBACKQ | CTLQUOTE, out);
+ else
+ USTPUTC(CTLBACKQ, out);
+ if (oldstyle)
+ goto parsebackq_oldreturn;
+ else
+ goto parsebackq_newreturn;
+}
+
+/*
+ * Parse an arithmetic expansion (indicate start of one and set state)
+ */
+parsearith: {
+
+ if (++arinest == 1) {
+ prevsyntax = syntax;
+ syntax = ARISYNTAX;
+ USTPUTC(CTLARI, out);
+ if (dblquote)
+ USTPUTC('"',out);
+ else
+ USTPUTC(' ',out);
+ } else {
+ /*
+ * we collapse embedded arithmetic expansion to
+ * parenthesis, which should be equivalent
+ */
+ USTPUTC('(', out);
+ }
+ goto parsearith_return;
+}
+
+} /* end of readtoken */
+
+
+
+#ifdef mkinit
+INCLUDE "parser.h"
+RESET {
+ tokpushback = 0;
+ checkkwd = 0;
+ checkalias = 0;
+}
+#endif
+
+/*
+ * Returns true if the text contains nothing to expand (no dollar signs
+ * or backquotes).
+ */
+
+static int
+noexpand(text)
+ char *text;
+ {
+ char *p;
+ char c;
+
+ p = text;
+ while ((c = *p++) != '\0') {
+ if (c == CTLQUOTEMARK)
+ continue;
+ if (c == CTLESC)
+ p++;
+ else if (BASESYNTAX[(int)c] == CCTL)
+ return 0;
+ }
+ return 1;
+}
+
+
+/*
+ * Return true if the argument is a legal variable name (a letter or
+ * underscore followed by zero or more letters, underscores, and digits).
+ */
+
+static int
+goodname(char *name)
+ {
+ char *p;
+
+ p = name;
+ if (! is_name(*p))
+ return 0;
+ while (*++p) {
+ if (! is_in_name(*p))
+ return 0;
+ }
+ return 1;
+}
+
+
+/*
+ * Called when an unexpected token is read during the parse. The argument
+ * is the token that is expected, or -1 if more than one type of token can
+ * occur at this point.
+ */
+
+static void
+synexpect(token)
+ int token;
+{
+ char msg[64];
+
+ if (token >= 0) {
+ fmtstr(msg, 64, "%s unexpected (expecting %s)",
+ tokname[lasttoken], tokname[token]);
+ } else {
+ fmtstr(msg, 64, "%s unexpected", tokname[lasttoken]);
+ }
+ synerror(msg);
+ /* NOTREACHED */
+}
+
+
+static void
+synerror(msg)
+ const char *msg;
+ {
+ if (commandname)
+ outfmt(&errout, "%s: %d: ", commandname, startlinno);
+ outfmt(&errout, "Syntax error: %s\n", msg);
+ error((char *)NULL);
+ /* NOTREACHED */
+}
+
+static void
+setprompt(int which)
+{
+ whichprompt = which;
+ putprompt(getprompt(NULL));
+}
+
+/*
+ * called by editline -- any expansions to the prompt
+ * should be added here.
+ */
+static const char *
+getprompt(void *unused)
+ {
+ switch (whichprompt) {
+ case 0:
+ return "";
+ case 1:
+ return ps1val();
+ case 2:
+ return ps2val();
+ default:
+ return "<internal prompt error>";
+ }
+}
+
+static int
+isassignment(const char *word) {
+ if (!is_name(*word)) {
+ return 0;
+ }
+ do {
+ word++;
+ } while (is_in_name(*word));
+ return *word == '=';
+}
+
+static const char *const *
+findkwd(const char *s) {
+ return findstring(
+ s, parsekwd, sizeof(parsekwd) / sizeof(const char *)
+ );
+}
+/* $NetBSD: redir.c,v 1.22 2000/05/22 10:18:47 elric Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Code for dealing with input/output redirection.
+ */
+
+#define EMPTY -2 /* marks an unused slot in redirtab */
+#ifndef PIPE_BUF
+# define PIPESIZE 4096 /* amount of buffering in a pipe */
+#else
+# define PIPESIZE PIPE_BUF
+#endif
+
+
+struct redirtab *redirlist;
+
+/*
+ * We keep track of whether or not fd0 has been redirected. This is for
+ * background commands, where we want to redirect fd0 to /dev/null only
+ * if it hasn't already been redirected.
+*/
+static int fd0_redirected = 0;
+
+/*
+ * We also keep track of where fileno2 goes.
+ */
+static int fileno2 = 2;
+
+static int openredirect __P((union node *));
+static void dupredirect __P((union node *, int, char[10 ]));
+static int openhere __P((union node *));
+static int noclobberopen __P((const char *));
+
+
+/*
+ * Process a list of redirection commands. If the REDIR_PUSH flag is set,
+ * old file descriptors are stashed away so that the redirection can be
+ * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
+ * standard output, and the standard error if it becomes a duplicate of
+ * stdout, is saved in memory.
+ */
+
+static void
+redirect(redir, flags)
+ union node *redir;
+ int flags;
+ {
+ union node *n;
+ struct redirtab *sv = NULL;
+ int i;
+ int fd;
+ int newfd;
+ int try;
+ char memory[10]; /* file descriptors to write to memory */
+
+ for (i = 10 ; --i >= 0 ; )
+ memory[i] = 0;
+ memory[1] = flags & REDIR_BACKQ;
+ if (flags & REDIR_PUSH) {
+ sv = ckmalloc(sizeof (struct redirtab));
+ for (i = 0 ; i < 10 ; i++)
+ sv->renamed[i] = EMPTY;
+ sv->next = redirlist;
+ redirlist = sv;
+ }
+ for (n = redir ; n ; n = n->nfile.next) {
+ fd = n->nfile.fd;
+ try = 0;
+ if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) &&
+ n->ndup.dupfd == fd)
+ continue; /* redirect from/to same file descriptor */
+
+ INTOFF;
+ newfd = openredirect(n);
+ if (((flags & REDIR_PUSH) && sv->renamed[fd] == EMPTY) ||
+ (fd == fileno2)) {
+ if (newfd == fd) {
+ try++;
+ } else if ((i = fcntl(fd, F_DUPFD, 10)) == -1) {
+ switch (errno) {
+ case EBADF:
+ if (!try) {
+ dupredirect(n, newfd, memory);
+ try++;
+ break;
+ }
+ /* FALLTHROUGH*/
+ default:
+ if (newfd >= 0) {
+ close(newfd);
+ }
+ INTON;
+ error("%d: %s", fd, strerror(errno));
+ /* NOTREACHED */
+ }
+ }
+ if (!try) {
+ close(fd);
+ if (flags & REDIR_PUSH) {
+ sv->renamed[fd] = i;
+ }
+ if (fd == fileno2) {
+ fileno2 = i;
+ }
+ }
+ } else if (fd != newfd) {
+ close(fd);
+ }
+ if (fd == 0)
+ fd0_redirected++;
+ if (!try)
+ dupredirect(n, newfd, memory);
+ INTON;
+ }
+ if (memory[1])
+ out1 = &memout;
+ if (memory[2])
+ out2 = &memout;
+}
+
+
+static int
+openredirect(redir)
+ union node *redir;
+ {
+ char *fname;
+ int f;
+
+ switch (redir->nfile.type) {
+ case NFROM:
+ fname = redir->nfile.expfname;
+ if ((f = open(fname, O_RDONLY)) < 0)
+ goto eopen;
+ break;
+ case NFROMTO:
+ fname = redir->nfile.expfname;
+ if ((f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
+ goto ecreate;
+ break;
+ case NTO:
+ /* Take care of noclobber mode. */
+ if (Cflag) {
+ fname = redir->nfile.expfname;
+ if ((f = noclobberopen(fname)) < 0)
+ goto ecreate;
+ break;
+ }
+ case NTOOV:
+ fname = redir->nfile.expfname;
+#ifdef O_CREAT
+ if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
+ goto ecreate;
+#else
+ if ((f = creat(fname, 0666)) < 0)
+ goto ecreate;
+#endif
+ break;
+ case NAPPEND:
+ fname = redir->nfile.expfname;
+#ifdef O_APPEND
+ if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
+ goto ecreate;
+#else
+ if ((f = open(fname, O_WRONLY)) < 0
+ && (f = creat(fname, 0666)) < 0)
+ goto ecreate;
+ lseek(f, (off_t)0, 2);
+#endif
+ break;
+ default:
+#ifdef DEBUG
+ abort();
+#endif
+ /* Fall through to eliminate warning. */
+ case NTOFD:
+ case NFROMFD:
+ f = -1;
+ break;
+ case NHERE:
+ case NXHERE:
+ f = openhere(redir);
+ break;
+ }
+
+ return f;
+ecreate:
+ error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
+eopen:
+ error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
+}
+
+
+static void
+dupredirect(redir, f, memory)
+ union node *redir;
+ int f;
+ char memory[10];
+ {
+ int fd = redir->nfile.fd;
+
+ memory[fd] = 0;
+ if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
+ if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
+ if (memory[redir->ndup.dupfd])
+ memory[fd] = 1;
+ else
+ dup_as_newfd(redir->ndup.dupfd, fd);
+ }
+ return;
+ }
+
+ if (f != fd) {
+ dup_as_newfd(f, fd);
+ close(f);
+ }
+ return;
+}
+
+
+/*
+ * Handle here documents. Normally we fork off a process to write the
+ * data to a pipe. If the document is short, we can stuff the data in
+ * the pipe without forking.
+ */
+
+static int
+openhere(redir)
+ union node *redir;
+ {
+ int pip[2];
+ int len = 0;
+
+ if (pipe(pip) < 0)
+ error("Pipe call failed");
+ if (redir->type == NHERE) {
+ len = strlen(redir->nhere.doc->narg.text);
+ if (len <= PIPESIZE) {
+ xwrite(pip[1], redir->nhere.doc->narg.text, len);
+ goto out;
+ }
+ }
+ if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
+ close(pip[0]);
+ signal(SIGINT, SIG_IGN);
+ signal(SIGQUIT, SIG_IGN);
+ signal(SIGHUP, SIG_IGN);
+#ifdef SIGTSTP
+ signal(SIGTSTP, SIG_IGN);
+#endif
+ signal(SIGPIPE, SIG_DFL);
+ if (redir->type == NHERE)
+ xwrite(pip[1], redir->nhere.doc->narg.text, len);
+ else
+ expandhere(redir->nhere.doc, pip[1]);
+ _exit(0);
+ }
+out:
+ close(pip[1]);
+ return pip[0];
+}
+
+
+
+/*
+ * Undo the effects of the last redirection.
+ */
+
+static void
+popredir() {
+ struct redirtab *rp = redirlist;
+ int i;
+
+ INTOFF;
+ for (i = 0 ; i < 10 ; i++) {
+ if (rp->renamed[i] != EMPTY) {
+ if (i == 0)
+ fd0_redirected--;
+ close(i);
+ if (rp->renamed[i] >= 0) {
+ dup_as_newfd(rp->renamed[i], i);
+ close(rp->renamed[i]);
+ }
+ if (rp->renamed[i] == fileno2) {
+ fileno2 = i;
+ }
+ }
+ }
+ redirlist = rp->next;
+ ckfree(rp);
+ INTON;
+}
+
+/*
+ * Undo all redirections. Called on error or interrupt.
+ */
+
+#ifdef mkinit
+
+INCLUDE "redir.h"
+
+RESET {
+ while (redirlist)
+ popredir();
+}
+
+SHELLPROC {
+ clearredir();
+}
+
+#endif
+
+/* Return true if fd 0 has already been redirected at least once. */
+static int
+fd0_redirected_p () {
+ return fd0_redirected != 0;
+}
+
+/*
+ * Discard all saved file descriptors.
+ */
+
+static void
+clearredir() {
+ struct redirtab *rp;
+ int i;
+
+ for (rp = redirlist ; rp ; rp = rp->next) {
+ for (i = 0 ; i < 10 ; i++) {
+ if (rp->renamed[i] >= 0) {
+ close(rp->renamed[i]);
+ if (rp->renamed[i] == fileno2) {
+ fileno2 = -1;
+ }
+ }
+ rp->renamed[i] = EMPTY;
+ }
+ }
+ if (fileno2 != 2 && fileno2 >= 0) {
+ close(fileno2);
+ fileno2 = -1;
+ }
+}
+
+
+
+/*
+ * Copy a file descriptor to be >= to. Returns -1
+ * if the source file descriptor is closed, EMPTY if there are no unused
+ * file descriptors left.
+ */
+
+static int
+dup_as_newfd(from, to)
+ int from;
+ int to;
+{
+ int newfd;
+
+ newfd = fcntl(from, F_DUPFD, to);
+ if (newfd < 0) {
+ if (errno == EMFILE)
+ return EMPTY;
+ else
+ error("%d: %s", from, strerror(errno));
+ }
+ return newfd;
+}
+
+/*
+ * Open a file in noclobber mode.
+ * The code was copied from bash.
+ */
+static int
+noclobberopen(fname)
+ const char *fname;
+{
+ int r, fd;
+ struct stat finfo, finfo2;
+
+ /*
+ * If the file exists and is a regular file, return an error
+ * immediately.
+ */
+ r = stat(fname, &finfo);
+ if (r == 0 && S_ISREG(finfo.st_mode)) {
+ errno = EEXIST;
+ return -1;
+ }
+
+ /*
+ * If the file was not present (r != 0), make sure we open it
+ * exclusively so that if it is created before we open it, our open
+ * will fail. Make sure that we do not truncate an existing file.
+ * Note that we don't turn on O_EXCL unless the stat failed -- if the
+ * file was not a regular file, we leave O_EXCL off.
+ */
+ if (r != 0)
+ return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
+ fd = open(fname, O_WRONLY|O_CREAT, 0666);
+
+ /* If the open failed, return the file descriptor right away. */
+ if (fd < 0)
+ return fd;
+
+ /*
+ * OK, the open succeeded, but the file may have been changed from a
+ * non-regular file to a regular file between the stat and the open.
+ * We are assuming that the O_EXCL open handles the case where FILENAME
+ * did not exist and is symlinked to an existing file between the stat
+ * and open.
+ */
+
+ /*
+ * If we can open it and fstat the file descriptor, and neither check
+ * revealed that it was a regular file, and the file has not been
+ * replaced, return the file descriptor.
+ */
+ if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) &&
+ finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
+ return fd;
+
+ /* The file has been replaced. badness. */
+ close(fd);
+ errno = EEXIST;
+ return -1;
+}
+/* $NetBSD: setmode.c,v 1.28 2000/01/25 15:43:43 enami Exp $ */
+
+/*
+ * Copyright (c) 1989, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Dave Borman at Cray Research, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifdef __weak_alias
+__weak_alias(getmode,_getmode)
+__weak_alias(setmode,_setmode)
+#endif
+
+#ifdef __GLIBC__
+#define S_ISTXT __S_ISVTX
+#endif
+
+#define SET_LEN 6 /* initial # of bitcmd struct to malloc */
+#define SET_LEN_INCR 4 /* # of bitcmd structs to add as needed */
+
+typedef struct bitcmd {
+ char cmd;
+ char cmd2;
+ mode_t bits;
+} BITCMD;
+
+#define CMD2_CLR 0x01
+#define CMD2_SET 0x02
+#define CMD2_GBITS 0x04
+#define CMD2_OBITS 0x08
+#define CMD2_UBITS 0x10
+
+static BITCMD *addcmd __P((BITCMD *, int, int, int, u_int));
+static void compress_mode __P((BITCMD *));
+#ifdef SETMODE_DEBUG
+static void dumpmode __P((BITCMD *));
+#endif
+
+/*
+ * Given the old mode and an array of bitcmd structures, apply the operations
+ * described in the bitcmd structures to the old mode, and return the new mode.
+ * Note that there is no '=' command; a strict assignment is just a '-' (clear
+ * bits) followed by a '+' (set bits).
+ */
+mode_t
+getmode(bbox, omode)
+ const void *bbox;
+ mode_t omode;
+{
+ const BITCMD *set;
+ mode_t clrval, newmode, value;
+
+ _DIAGASSERT(bbox != NULL);
+
+ set = (const BITCMD *)bbox;
+ newmode = omode;
+ for (value = 0;; set++)
+ switch(set->cmd) {
+ /*
+ * When copying the user, group or other bits around, we "know"
+ * where the bits are in the mode so that we can do shifts to
+ * copy them around. If we don't use shifts, it gets real
+ * grundgy with lots of single bit checks and bit sets.
+ */
+ case 'u':
+ value = (newmode & S_IRWXU) >> 6;
+ goto common;
+
+ case 'g':
+ value = (newmode & S_IRWXG) >> 3;
+ goto common;
+
+ case 'o':
+ value = newmode & S_IRWXO;
+common: if (set->cmd2 & CMD2_CLR) {
+ clrval =
+ (set->cmd2 & CMD2_SET) ? S_IRWXO : value;
+ if (set->cmd2 & CMD2_UBITS)
+ newmode &= ~((clrval<<6) & set->bits);
+ if (set->cmd2 & CMD2_GBITS)
+ newmode &= ~((clrval<<3) & set->bits);
+ if (set->cmd2 & CMD2_OBITS)
+ newmode &= ~(clrval & set->bits);
+ }
+ if (set->cmd2 & CMD2_SET) {
+ if (set->cmd2 & CMD2_UBITS)
+ newmode |= (value<<6) & set->bits;
+ if (set->cmd2 & CMD2_GBITS)
+ newmode |= (value<<3) & set->bits;
+ if (set->cmd2 & CMD2_OBITS)
+ newmode |= value & set->bits;
+ }
+ break;
+
+ case '+':
+ newmode |= set->bits;
+ break;
+
+ case '-':
+ newmode &= ~set->bits;
+ break;
+
+ case 'X':
+ if (omode & (S_IFDIR|S_IXUSR|S_IXGRP|S_IXOTH))
+ newmode |= set->bits;
+ break;
+
+ case '\0':
+ default:
+#ifdef SETMODE_DEBUG
+ (void)printf("getmode:%04o -> %04o\n", omode, newmode);
+#endif
+ return (newmode);
+ }
+}
+
+#define ADDCMD(a, b, c, d) do { \
+ if (set >= endset) { \
+ BITCMD *newset; \
+ setlen += SET_LEN_INCR; \
+ newset = realloc(saveset, sizeof(BITCMD) * setlen); \
+ if (newset == NULL) { \
+ free(saveset); \
+ return (NULL); \
+ } \
+ set = newset + (set - saveset); \
+ saveset = newset; \
+ endset = newset + (setlen - 2); \
+ } \
+ set = addcmd(set, (a), (b), (c), (d)); \
+} while (/*CONSTCOND*/0)
+
+#define STANDARD_BITS (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
+
+static void *
+setmode(p)
+ const char *p;
+{
+ int perm, who;
+ char op, *ep;
+ BITCMD *set, *saveset, *endset;
+ sigset_t mysigset, sigoset;
+ mode_t mask;
+ int equalopdone = 0; /* pacify gcc */
+ int permXbits, setlen;
+
+ if (!*p)
+ return (NULL);
+
+ /*
+ * Get a copy of the mask for the permissions that are mask relative.
+ * Flip the bits, we want what's not set. Since it's possible that
+ * the caller is opening files inside a signal handler, protect them
+ * as best we can.
+ */
+ sigfillset(&mysigset);
+ (void)sigprocmask(SIG_BLOCK, &mysigset, &sigoset);
+ (void)umask(mask = umask(0));
+ mask = ~mask;
+ (void)sigprocmask(SIG_SETMASK, &sigoset, NULL);
+
+ setlen = SET_LEN + 2;
+
+ if ((set = malloc((u_int)(sizeof(BITCMD) * setlen))) == NULL)
+ return (NULL);
+ saveset = set;
+ endset = set + (setlen - 2);
+
+ /*
+ * If an absolute number, get it and return; disallow non-octal digits
+ * or illegal bits.
+ */
+ if (isdigit((unsigned char)*p)) {
+ perm = (mode_t)strtol(p, &ep, 8);
+ if (*ep || perm & ~(STANDARD_BITS|S_ISTXT)) {
+ free(saveset);
+ return (NULL);
+ }
+ ADDCMD('=', (STANDARD_BITS|S_ISTXT), perm, mask);
+ set->cmd = 0;
+ return (saveset);
+ }
+
+ /*
+ * Build list of structures to set/clear/copy bits as described by
+ * each clause of the symbolic mode.
+ */
+ for (;;) {
+ /* First, find out which bits might be modified. */
+ for (who = 0;; ++p) {
+ switch (*p) {
+ case 'a':
+ who |= STANDARD_BITS;
+ break;
+ case 'u':
+ who |= S_ISUID|S_IRWXU;
+ break;
+ case 'g':
+ who |= S_ISGID|S_IRWXG;
+ break;
+ case 'o':
+ who |= S_IRWXO;
+ break;
+ default:
+ goto getop;
+ }
+ }
+
+getop: if ((op = *p++) != '+' && op != '-' && op != '=') {
+ free(saveset);
+ return (NULL);
+ }
+ if (op == '=')
+ equalopdone = 0;
+
+ who &= ~S_ISTXT;
+ for (perm = 0, permXbits = 0;; ++p) {
+ switch (*p) {
+ case 'r':
+ perm |= S_IRUSR|S_IRGRP|S_IROTH;
+ break;
+ case 's':
+ /*
+ * If specific bits where requested and
+ * only "other" bits ignore set-id.
+ */
+ if (who == 0 || (who & ~S_IRWXO))
+ perm |= S_ISUID|S_ISGID;
+ break;
+ case 't':
+ /*
+ * If specific bits where requested and
+ * only "other" bits ignore set-id.
+ */
+ if (who == 0 || (who & ~S_IRWXO)) {
+ who |= S_ISTXT;
+ perm |= S_ISTXT;
+ }
+ break;
+ case 'w':
+ perm |= S_IWUSR|S_IWGRP|S_IWOTH;
+ break;
+ case 'X':
+ permXbits = S_IXUSR|S_IXGRP|S_IXOTH;
+ break;
+ case 'x':
+ perm |= S_IXUSR|S_IXGRP|S_IXOTH;
+ break;
+ case 'u':
+ case 'g':
+ case 'o':
+ /*
+ * When ever we hit 'u', 'g', or 'o', we have
+ * to flush out any partial mode that we have,
+ * and then do the copying of the mode bits.
+ */
+ if (perm) {
+ ADDCMD(op, who, perm, mask);
+ perm = 0;
+ }
+ if (op == '=')
+ equalopdone = 1;
+ if (op == '+' && permXbits) {
+ ADDCMD('X', who, permXbits, mask);
+ permXbits = 0;
+ }
+ ADDCMD(*p, who, op, mask);
+ break;
+
+ default:
+ /*
+ * Add any permissions that we haven't already
+ * done.
+ */
+ if (perm || (op == '=' && !equalopdone)) {
+ if (op == '=')
+ equalopdone = 1;
+ ADDCMD(op, who, perm, mask);
+ perm = 0;
+ }
+ if (permXbits) {
+ ADDCMD('X', who, permXbits, mask);
+ permXbits = 0;
+ }
+ goto apply;
+ }
+ }
+
+apply: if (!*p)
+ break;
+ if (*p != ',')
+ goto getop;
+ ++p;
+ }
+ set->cmd = 0;
+#ifdef SETMODE_DEBUG
+ (void)printf("Before compress_mode()\n");
+ dumpmode(saveset);
+#endif
+ compress_mode(saveset);
+#ifdef SETMODE_DEBUG
+ (void)printf("After compress_mode()\n");
+ dumpmode(saveset);
+#endif
+ return (saveset);
+}
+
+static BITCMD *
+addcmd(set, op, who, oparg, mask)
+ BITCMD *set;
+ int oparg, who;
+ int op;
+ u_int mask;
+{
+
+ _DIAGASSERT(set != NULL);
+
+ switch (op) {
+ case '=':
+ set->cmd = '-';
+ set->bits = who ? who : STANDARD_BITS;
+ set++;
+
+ op = '+';
+ /* FALLTHROUGH */
+ case '+':
+ case '-':
+ case 'X':
+ set->cmd = op;
+ set->bits = (who ? who : mask) & oparg;
+ break;
+
+ case 'u':
+ case 'g':
+ case 'o':
+ set->cmd = op;
+ if (who) {
+ set->cmd2 = ((who & S_IRUSR) ? CMD2_UBITS : 0) |
+ ((who & S_IRGRP) ? CMD2_GBITS : 0) |
+ ((who & S_IROTH) ? CMD2_OBITS : 0);
+ set->bits = (mode_t)~0;
+ } else {
+ set->cmd2 = CMD2_UBITS | CMD2_GBITS | CMD2_OBITS;
+ set->bits = mask;
+ }
+
+ if (oparg == '+')
+ set->cmd2 |= CMD2_SET;
+ else if (oparg == '-')
+ set->cmd2 |= CMD2_CLR;
+ else if (oparg == '=')
+ set->cmd2 |= CMD2_SET|CMD2_CLR;
+ break;
+ }
+ return (set + 1);
+}
+
+#ifdef SETMODE_DEBUG
+static void
+dumpmode(set)
+ BITCMD *set;
+{
+
+ _DIAGASSERT(set != NULL);
+
+ for (; set->cmd; ++set)
+ (void)printf("cmd: '%c' bits %04o%s%s%s%s%s%s\n",
+ set->cmd, set->bits, set->cmd2 ? " cmd2:" : "",
+ set->cmd2 & CMD2_CLR ? " CLR" : "",
+ set->cmd2 & CMD2_SET ? " SET" : "",
+ set->cmd2 & CMD2_UBITS ? " UBITS" : "",
+ set->cmd2 & CMD2_GBITS ? " GBITS" : "",
+ set->cmd2 & CMD2_OBITS ? " OBITS" : "");
+}
+#endif
+
+/*
+ * Given an array of bitcmd structures, compress by compacting consecutive
+ * '+', '-' and 'X' commands into at most 3 commands, one of each. The 'u',
+ * 'g' and 'o' commands continue to be separate. They could probably be
+ * compacted, but it's not worth the effort.
+ */
+static void
+compress_mode(set)
+ BITCMD *set;
+{
+ BITCMD *nset;
+ int setbits, clrbits, Xbits, op;
+
+ _DIAGASSERT(set != NULL);
+
+ for (nset = set;;) {
+ /* Copy over any 'u', 'g' and 'o' commands. */
+ while ((op = nset->cmd) != '+' && op != '-' && op != 'X') {
+ *set++ = *nset++;
+ if (!op)
+ return;
+ }
+
+ for (setbits = clrbits = Xbits = 0;; nset++) {
+ if ((op = nset->cmd) == '-') {
+ clrbits |= nset->bits;
+ setbits &= ~nset->bits;
+ Xbits &= ~nset->bits;
+ } else if (op == '+') {
+ setbits |= nset->bits;
+ clrbits &= ~nset->bits;
+ Xbits &= ~nset->bits;
+ } else if (op == 'X')
+ Xbits |= nset->bits & ~setbits;
+ else
+ break;
+ }
+ if (clrbits) {
+ set->cmd = '-';
+ set->cmd2 = 0;
+ set->bits = clrbits;
+ set++;
+ }
+ if (setbits) {
+ set->cmd = '+';
+ set->cmd2 = 0;
+ set->bits = setbits;
+ set++;
+ }
+ if (Xbits) {
+ set->cmd = 'X';
+ set->cmd2 = 0;
+ set->bits = Xbits;
+ set++;
+ }
+ }
+}
+/* $NetBSD: show.c,v 1.18 1999/10/08 21:10:44 pk Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#ifdef DEBUG
+static void shtree __P((union node *, int, char *, FILE*));
+static void shcmd __P((union node *, FILE *));
+static void sharg __P((union node *, FILE *));
+static void indent __P((int, char *, FILE *));
+static void trstring __P((char *));
+
+
+static void
+showtree(n)
+ union node *n;
+{
+ trputs("showtree called\n");
+ shtree(n, 1, NULL, stdout);
+}
+
+
+static void
+shtree(n, ind, pfx, fp)
+ union node *n;
+ int ind;
+ char *pfx;
+ FILE *fp;
+{
+ struct nodelist *lp;
+ const char *s;
+
+ if (n == NULL)
+ return;
+
+ indent(ind, pfx, fp);
+ switch(n->type) {
+ case NSEMI:
+ s = "; ";
+ goto binop;
+ case NAND:
+ s = " && ";
+ goto binop;
+ case NOR:
+ s = " || ";
+binop:
+ shtree(n->nbinary.ch1, ind, NULL, fp);
+ /* if (ind < 0) */
+ fputs(s, fp);
+ shtree(n->nbinary.ch2, ind, NULL, fp);
+ break;
+ case NCMD:
+ shcmd(n, fp);
+ if (ind >= 0)
+ putc('\n', fp);
+ break;
+ case NPIPE:
+ for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
+ shcmd(lp->n, fp);
+ if (lp->next)
+ fputs(" | ", fp);
+ }
+ if (n->npipe.backgnd)
+ fputs(" &", fp);
+ if (ind >= 0)
+ putc('\n', fp);
+ break;
+ default:
+ fprintf(fp, "<node type %d>", n->type);
+ if (ind >= 0)
+ putc('\n', fp);
+ break;
+ }
+}
+
+
+
+static void
+shcmd(cmd, fp)
+ union node *cmd;
+ FILE *fp;
+{
+ union node *np;
+ int first;
+ const char *s;
+ int dftfd;
+
+ first = 1;
+ for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
+ if (! first)
+ putchar(' ');
+ sharg(np, fp);
+ first = 0;
+ }
+ for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
+ if (! first)
+ putchar(' ');
+ switch (np->nfile.type) {
+ case NTO: s = ">"; dftfd = 1; break;
+ case NAPPEND: s = ">>"; dftfd = 1; break;
+ case NTOFD: s = ">&"; dftfd = 1; break;
+ case NTOOV: s = ">|"; dftfd = 1; break;
+ case NFROM: s = "<"; dftfd = 0; break;
+ case NFROMFD: s = "<&"; dftfd = 0; break;
+ case NFROMTO: s = "<>"; dftfd = 0; break;
+ default: s = "*error*"; dftfd = 0; break;
+ }
+ if (np->nfile.fd != dftfd)
+ fprintf(fp, "%d", np->nfile.fd);
+ fputs(s, fp);
+ if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
+ fprintf(fp, "%d", np->ndup.dupfd);
+ } else {
+ sharg(np->nfile.fname, fp);
+ }
+ first = 0;
+ }
+}
+
+
+
+static void
+sharg(arg, fp)
+ union node *arg;
+ FILE *fp;
+ {
+ char *p;
+ struct nodelist *bqlist;
+ int subtype;
+
+ if (arg->type != NARG) {
+ printf("<node type %d>\n", arg->type);
+ fflush(stdout);
+ abort();
+ }
+ bqlist = arg->narg.backquote;
+ for (p = arg->narg.text ; *p ; p++) {
+ switch (*p) {
+ case CTLESC:
+ putc(*++p, fp);
+ break;
+ case CTLVAR:
+ putc('$', fp);
+ putc('{', fp);
+ subtype = *++p;
+ if (subtype == VSLENGTH)
+ putc('#', fp);
+
+ while (*p != '=')
+ putc(*p++, fp);
+
+ if (subtype & VSNUL)
+ putc(':', fp);
+
+ switch (subtype & VSTYPE) {
+ case VSNORMAL:
+ putc('}', fp);
+ break;
+ case VSMINUS:
+ putc('-', fp);
+ break;
+ case VSPLUS:
+ putc('+', fp);
+ break;
+ case VSQUESTION:
+ putc('?', fp);
+ break;
+ case VSASSIGN:
+ putc('=', fp);
+ break;
+ case VSTRIMLEFT:
+ putc('#', fp);
+ break;
+ case VSTRIMLEFTMAX:
+ putc('#', fp);
+ putc('#', fp);
+ break;
+ case VSTRIMRIGHT:
+ putc('%', fp);
+ break;
+ case VSTRIMRIGHTMAX:
+ putc('%', fp);
+ putc('%', fp);
+ break;
+ case VSLENGTH:
+ break;
+ default:
+ printf("<subtype %d>", subtype);
+ }
+ break;
+ case CTLENDVAR:
+ putc('}', fp);
+ break;
+ case CTLBACKQ:
+ case CTLBACKQ|CTLQUOTE:
+ putc('$', fp);
+ putc('(', fp);
+ shtree(bqlist->n, -1, NULL, fp);
+ putc(')', fp);
+ break;
+ default:
+ putc(*p, fp);
+ break;
+ }
+ }
+}
+
+
+static void
+indent(amount, pfx, fp)
+ int amount;
+ char *pfx;
+ FILE *fp;
+{
+ int i;
+
+ for (i = 0 ; i < amount ; i++) {
+ if (pfx && i == amount - 1)
+ fputs(pfx, fp);
+ putc('\t', fp);
+ }
+}
+#endif
+
+
+
+/*
+ * Debugging stuff.
+ */
+
+
+#ifdef DEBUG
+FILE *tracefile;
+
+#if DEBUG == 2
+static int debug = 1;
+#else
+static int debug = 0;
+#endif
+
+
+static void
+trputc(c)
+ int c;
+{
+ if (tracefile == NULL)
+ return;
+ putc(c, tracefile);
+ if (c == '\n')
+ fflush(tracefile);
+}
+
+static void
+trace(const char *fmt, ...)
+{
+ va_list va;
+#ifdef __STDC__
+ va_start(va, fmt);
+#else
+ char *fmt;
+ va_start(va);
+ fmt = va_arg(va, char *);
+#endif
+ if (tracefile != NULL) {
+ (void) vfprintf(tracefile, fmt, va);
+ if (strchr(fmt, '\n'))
+ (void) fflush(tracefile);
+ }
+ va_end(va);
+}
+
+
+static void
+trputs(s)
+ const char *s;
+{
+ if (tracefile == NULL)
+ return;
+ fputs(s, tracefile);
+ if (strchr(s, '\n'))
+ fflush(tracefile);
+}
+
+
+static void
+trstring(s)
+ char *s;
+{
+ char *p;
+ char c;
+
+ if (tracefile == NULL)
+ return;
+ putc('"', tracefile);
+ for (p = s ; *p ; p++) {
+ switch (*p) {
+ case '\n': c = 'n'; goto backslash;
+ case '\t': c = 't'; goto backslash;
+ case '\r': c = 'r'; goto backslash;
+ case '"': c = '"'; goto backslash;
+ case '\\': c = '\\'; goto backslash;
+ case CTLESC: c = 'e'; goto backslash;
+ case CTLVAR: c = 'v'; goto backslash;
+ case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
+ case CTLBACKQ: c = 'q'; goto backslash;
+ case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
+backslash: putc('\\', tracefile);
+ putc(c, tracefile);
+ break;
+ default:
+ if (*p >= ' ' && *p <= '~')
+ putc(*p, tracefile);
+ else {
+ putc('\\', tracefile);
+ putc(*p >> 6 & 03, tracefile);
+ putc(*p >> 3 & 07, tracefile);
+ putc(*p & 07, tracefile);
+ }
+ break;
+ }
+ }
+ putc('"', tracefile);
+}
+
+
+static void
+trargs(ap)
+ char **ap;
+{
+ if (tracefile == NULL)
+ return;
+ while (*ap) {
+ trstring(*ap++);
+ if (*ap)
+ putc(' ', tracefile);
+ else
+ putc('\n', tracefile);
+ }
+ fflush(tracefile);
+}
+
+
+static void
+opentrace() {
+ char s[100];
+#ifdef O_APPEND
+ int flags;
+#endif
+
+ if (!debug)
+ return;
+#ifdef not_this_way
+ {
+ char *p;
+ if ((p = getenv("HOME")) == NULL) {
+ if (geteuid() == 0)
+ p = "/";
+ else
+ p = "/tmp";
+ }
+ scopy(p, s);
+ strcat(s, "/trace");
+ }
+#else
+ scopy("./trace", s);
+#endif /* not_this_way */
+ if ((tracefile = fopen(s, "a")) == NULL) {
+ fprintf(stderr, "Can't open %s\n", s);
+ return;
+ }
+#ifdef O_APPEND
+ if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
+ fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
+#endif
+ fputs("\nTracing started.\n", tracefile);
+ fflush(tracefile);
+}
+#endif /* DEBUG */
+
+
+/*
+ * This file was generated by the mksyntax program.
+ */
+
+/* syntax table used when not in quotes */
+static const char basesyntax[257] = {
+ CEOF, CSPCL, CWORD, CCTL,
+ CCTL, CCTL, CCTL, CCTL,
+ CCTL, CCTL, CCTL, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CSPCL,
+ CNL, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CSPCL, CWORD,
+ CDQUOTE, CWORD, CVAR, CWORD,
+ CSPCL, CSQUOTE, CSPCL, CSPCL,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CSPCL, CSPCL, CWORD,
+ CSPCL, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CBACK, CWORD,
+ CWORD, CWORD, CBQUOTE, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CSPCL, CENDVAR,
+ CWORD
+};
+
+/* syntax table used when in double quotes */
+static const char dqsyntax[257] = {
+ CEOF, CIGN, CWORD, CCTL,
+ CCTL, CCTL, CCTL, CCTL,
+ CCTL, CCTL, CCTL, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CNL, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CCTL,
+ CENDQUOTE,CWORD, CVAR, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CCTL, CWORD, CWORD, CCTL,
+ CWORD, CCTL, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CCTL, CWORD, CWORD, CCTL,
+ CWORD, CCTL, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CCTL, CBACK, CCTL,
+ CWORD, CWORD, CBQUOTE, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CENDVAR,
+ CCTL
+};
+
+/* syntax table used when in single quotes */
+static const char sqsyntax[257] = {
+ CEOF, CIGN, CWORD, CCTL,
+ CCTL, CCTL, CCTL, CCTL,
+ CCTL, CCTL, CCTL, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CNL, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CCTL,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CENDQUOTE,CWORD, CWORD,
+ CCTL, CWORD, CWORD, CCTL,
+ CWORD, CCTL, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CCTL, CWORD, CWORD, CCTL,
+ CWORD, CCTL, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CCTL, CCTL, CCTL,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CCTL
+};
+
+/* syntax table used when in arithmetic */
+static const char arisyntax[257] = {
+ CEOF, CIGN, CWORD, CCTL,
+ CCTL, CCTL, CCTL, CCTL,
+ CCTL, CCTL, CCTL, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CNL, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CDQUOTE, CWORD, CVAR, CWORD,
+ CWORD, CSQUOTE, CLP, CRP,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CBACK, CWORD,
+ CWORD, CWORD, CBQUOTE, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CWORD,
+ CWORD, CWORD, CWORD, CENDVAR,
+ CWORD
+};
+
+/* character classification table */
+static const char is_type[257] = {
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, 0,
+ 0, 0, 0, ISSPECL,
+ 0, ISSPECL, ISSPECL, 0,
+ 0, 0, 0, 0,
+ ISSPECL, 0, 0, ISSPECL,
+ 0, 0, ISDIGIT, ISDIGIT,
+ ISDIGIT, ISDIGIT, ISDIGIT, ISDIGIT,
+ ISDIGIT, ISDIGIT, ISDIGIT, ISDIGIT,
+ 0, 0, 0, 0,
+ 0, ISSPECL, ISSPECL, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, ISUPPER, ISUPPER, ISUPPER,
+ ISUPPER, 0, 0, 0,
+ 0, ISUNDER, 0, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, ISLOWER, ISLOWER, ISLOWER,
+ ISLOWER, 0, 0, 0,
+ 0
+};
+/* $NetBSD: trap.c,v 1.25 2001/02/04 19:52:07 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Sigmode records the current value of the signal handlers for the various
+ * modes. A value of zero means that the current handler is not known.
+ * S_HARD_IGN indicates that the signal was ignored on entry to the shell,
+ */
+
+/*
+ * The trap builtin.
+ */
+
+static int
+trapcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char *action;
+ char **ap;
+ int signo;
+
+ if (argc <= 1) {
+ for (signo = 0 ; signo < NSIG ; signo++) {
+ if (trap[signo] != NULL) {
+ char *p;
+
+ p = single_quote(trap[signo]);
+ out1fmt("trap -- %s %s\n", p,
+ signal_names[signo] + (signo ? 3 : 0)
+ );
+ stunalloc(p);
+ }
+ }
+ return 0;
+ }
+ ap = argv + 1;
+ if (argc == 2)
+ action = NULL;
+ else
+ action = *ap++;
+ while (*ap) {
+ if ((signo = decode_signal(*ap, 0)) < 0)
+ error("%s: bad trap", *ap);
+ INTOFF;
+ if (action) {
+ if (action[0] == '-' && action[1] == '\0')
+ action = NULL;
+ else
+ action = savestr(action);
+ }
+ if (trap[signo])
+ ckfree(trap[signo]);
+ trap[signo] = action;
+ if (signo != 0)
+ setsignal(signo);
+ INTON;
+ ap++;
+ }
+ return 0;
+}
+
+
+
+/*
+ * Clear traps on a fork.
+ */
+
+static void
+clear_traps() {
+ char **tp;
+
+ for (tp = trap ; tp < &trap[NSIG] ; tp++) {
+ if (*tp && **tp) { /* trap not NULL or SIG_IGN */
+ INTOFF;
+ ckfree(*tp);
+ *tp = NULL;
+ if (tp != &trap[0])
+ setsignal(tp - trap);
+ INTON;
+ }
+ }
+}
+
+
+
+/*
+ * Set the signal handler for the specified signal. The routine figures
+ * out what it should be set to.
+ */
+
+static void
+setsignal(signo)
+ int signo;
+{
+ int action;
+ char *t;
+ struct sigaction act;
+
+ if ((t = trap[signo]) == NULL)
+ action = S_DFL;
+ else if (*t != '\0')
+ action = S_CATCH;
+ else
+ action = S_IGN;
+ if (rootshell && action == S_DFL) {
+ switch (signo) {
+ case SIGINT:
+ if (iflag || minusc || sflag == 0)
+ action = S_CATCH;
+ break;
+ case SIGQUIT:
+#ifdef DEBUG
+ {
+ extern int debug;
+
+ if (debug)
+ break;
+ }
+#endif
+ /* FALLTHROUGH */
+ case SIGTERM:
+ if (iflag)
+ action = S_IGN;
+ break;
+#if JOBS
+ case SIGTSTP:
+ case SIGTTOU:
+ if (mflag)
+ action = S_IGN;
+ break;
+#endif
+ }
+ }
+
+ t = &sigmode[signo - 1];
+ if (*t == 0) {
+ /*
+ * current setting unknown
+ */
+ if (sigaction(signo, 0, &act) == -1) {
+ /*
+ * Pretend it worked; maybe we should give a warning
+ * here, but other shells don't. We don't alter
+ * sigmode, so that we retry every time.
+ */
+ return;
+ }
+ if (act.sa_handler == SIG_IGN) {
+ if (mflag && (signo == SIGTSTP ||
+ signo == SIGTTIN || signo == SIGTTOU)) {
+ *t = S_IGN; /* don't hard ignore these */
+ } else
+ *t = S_HARD_IGN;
+ } else {
+ *t = S_RESET; /* force to be set */
+ }
+ }
+ if (*t == S_HARD_IGN || *t == action)
+ return;
+ switch (action) {
+ case S_CATCH:
+ act.sa_handler = onsig;
+ break;
+ case S_IGN:
+ act.sa_handler = SIG_IGN;
+ break;
+ default:
+ act.sa_handler = SIG_DFL;
+ }
+ *t = action;
+ act.sa_flags = 0;
+ sigemptyset(&act.sa_mask);
+ sigaction(signo, &act, 0);
+}
+
+/*
+ * Ignore a signal.
+ */
+
+static void
+ignoresig(signo)
+ int signo;
+{
+ if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
+ signal(signo, SIG_IGN);
+ }
+ sigmode[signo - 1] = S_HARD_IGN;
+}
+
+
+#ifdef mkinit
+INCLUDE <signal.h>
+INCLUDE "trap.h"
+
+SHELLPROC {
+ char *sm;
+
+ clear_traps();
+ for (sm = sigmode ; sm < sigmode + NSIG - 1; sm++) {
+ if (*sm == S_IGN)
+ *sm = S_HARD_IGN;
+ }
+}
+#endif
+
+
+
+/*
+ * Signal handler.
+ */
+
+static void
+onsig(signo)
+ int signo;
+{
+ if (signo == SIGINT && trap[SIGINT] == NULL) {
+ onint();
+ return;
+ }
+ gotsig[signo - 1] = 1;
+ pendingsigs++;
+}
+
+
+
+/*
+ * Called to execute a trap. Perhaps we should avoid entering new trap
+ * handlers while we are executing a trap handler.
+ */
+
+static void
+dotrap() {
+ int i;
+ int savestatus;
+
+ for (;;) {
+ for (i = 1 ; ; i++) {
+ if (gotsig[i - 1])
+ break;
+ if (i >= NSIG - 1)
+ goto done;
+ }
+ gotsig[i - 1] = 0;
+ savestatus=exitstatus;
+ evalstring(trap[i], 0);
+ exitstatus=savestatus;
+ }
+done:
+ pendingsigs = 0;
+}
+
+
+
+/*
+ * Controls whether the shell is interactive or not.
+ */
+
+
+static void
+setinteractive(on)
+ int on;
+{
+ static int is_interactive;
+
+ if (on == is_interactive)
+ return;
+ setsignal(SIGINT);
+ setsignal(SIGQUIT);
+ setsignal(SIGTERM);
+ chkmail(1);
+ is_interactive = on;
+}
+
+
+
+/*
+ * Called to exit the shell.
+ */
+
+static void
+exitshell(status)
+ int status;
+{
+ struct jmploc loc1, loc2;
+ char *p;
+
+ TRACE(("exitshell(%d) pid=%d\n", status, getpid()));
+ if (setjmp(loc1.loc)) {
+ goto l1;
+ }
+ if (setjmp(loc2.loc)) {
+ goto l2;
+ }
+ handler = &loc1;
+ if ((p = trap[0]) != NULL && *p != '\0') {
+ trap[0] = NULL;
+ evalstring(p, 0);
+ }
+l1: handler = &loc2; /* probably unnecessary */
+ flushall();
+#if JOBS
+ setjobctl(0);
+#endif
+l2: _exit(status);
+ /* NOTREACHED */
+}
+
+static int decode_signal(const char *string, int minsig)
+{
+ int signo;
+
+ if (is_number(string)) {
+ signo = atoi(string);
+ if (signo >= NSIG) {
+ return -1;
+ }
+ return signo;
+ }
+
+ signo = minsig;
+ if (!signo) {
+ goto zero;
+ }
+ for (; signo < NSIG; signo++) {
+ if (!strcasecmp(string, &(signal_names[signo])[3])) {
+ return signo;
+ }
+zero:
+ if (!strcasecmp(string, signal_names[signo])) {
+ return signo;
+ }
+ }
+
+ return -1;
+}
+/* $NetBSD: var.c,v 1.27 2001/02/04 19:52:07 christos Exp $ */
+
+/*-
+ * Copyright (c) 1991, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#define VTABSIZE 39
+
+
+struct varinit {
+ struct var *var;
+ int flags;
+ const char *text;
+ void (*func) __P((const char *));
+};
+
+struct localvar *localvars;
+
+#if ATTY
+struct var vatty;
+#endif
+struct var vifs;
+struct var vmail;
+struct var vmpath;
+struct var vpath;
+struct var vps1;
+struct var vps2;
+struct var vvers;
+struct var voptind;
+
+static const char defpathvar[] =
+ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
+#ifdef IFS_BROKEN
+static const char defifsvar[] = "IFS= \t\n";
+#else
+static const char defifs[] = " \t\n";
+#endif
+
+static const struct varinit varinit[] = {
+#if ATTY
+ { &vatty, VSTRFIXED|VTEXTFIXED|VUNSET, "ATTY=",
+ NULL },
+#endif
+#ifdef IFS_BROKEN
+ { &vifs, VSTRFIXED|VTEXTFIXED, defifsvar,
+#else
+ { &vifs, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS=",
+#endif
+ NULL },
+ { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=",
+ NULL },
+ { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=",
+ NULL },
+ { &vpath, VSTRFIXED|VTEXTFIXED, defpathvar,
+ changepath },
+ /*
+ * vps1 depends on uid
+ */
+ { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ",
+ NULL },
+ { &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1",
+ getoptsreset },
+ { NULL, 0, NULL,
+ NULL }
+};
+
+struct var *vartab[VTABSIZE];
+
+static struct var **hashvar __P((const char *));
+static void showvars __P((const char *, int, int));
+static struct var **findvar __P((struct var **, const char *));
+
+/*
+ * Initialize the varable symbol tables and import the environment
+ */
+
+#ifdef mkinit
+INCLUDE <unistd.h>
+INCLUDE "output.h"
+INCLUDE "var.h"
+static char **environ;
+INIT {
+ char **envp;
+ char ppid[32];
+
+ initvar();
+ for (envp = environ ; *envp ; envp++) {
+ if (strchr(*envp, '=')) {
+ setvareq(*envp, VEXPORT|VTEXTFIXED);
+ }
+ }
+
+ fmtstr(ppid, sizeof(ppid), "%d", (int) getppid());
+ setvar("PPID", ppid, 0);
+}
+#endif
+
+
+/*
+ * This routine initializes the builtin variables. It is called when the
+ * shell is initialized and again when a shell procedure is spawned.
+ */
+
+static void
+initvar() {
+ const struct varinit *ip;
+ struct var *vp;
+ struct var **vpp;
+
+ for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
+ if ((vp->flags & VEXPORT) == 0) {
+ vpp = hashvar(ip->text);
+ vp->next = *vpp;
+ *vpp = vp;
+ vp->text = strdup(ip->text);
+ vp->flags = ip->flags;
+ vp->func = ip->func;
+ }
+ }
+ /*
+ * PS1 depends on uid
+ */
+ if ((vps1.flags & VEXPORT) == 0) {
+ vpp = hashvar("PS1=");
+ vps1.next = *vpp;
+ *vpp = &vps1;
+ vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
+ vps1.flags = VSTRFIXED|VTEXTFIXED;
+ }
+}
+
+/*
+ * Set the value of a variable. The flags argument is ored with the
+ * flags of the variable. If val is NULL, the variable is unset.
+ */
+
+static void
+setvar(name, val, flags)
+ const char *name, *val;
+ int flags;
+{
+ const char *p;
+ int len;
+ int namelen;
+ char *nameeq;
+ int isbad;
+ int vallen = 0;
+
+ isbad = 0;
+ p = name;
+ if (! is_name(*p))
+ isbad = 1;
+ p++;
+ for (;;) {
+ if (! is_in_name(*p)) {
+ if (*p == '\0' || *p == '=')
+ break;
+ isbad = 1;
+ }
+ p++;
+ }
+ namelen = p - name;
+ if (isbad)
+ error("%.*s: bad variable name", namelen, name);
+ len = namelen + 2; /* 2 is space for '=' and '\0' */
+ if (val == NULL) {
+ flags |= VUNSET;
+ } else {
+ len += vallen = strlen(val);
+ }
+ INTOFF;
+ nameeq = ckmalloc(len);
+ memcpy(nameeq, name, namelen);
+ nameeq[namelen] = '=';
+ if (val) {
+ memcpy(nameeq + namelen + 1, val, vallen + 1);
+ } else {
+ nameeq[namelen + 1] = '\0';
+ }
+ setvareq(nameeq, flags);
+ INTON;
+}
+
+
+
+/*
+ * Same as setvar except that the variable and value are passed in
+ * the first argument as name=value. Since the first argument will
+ * be actually stored in the table, it should not be a string that
+ * will go away.
+ */
+
+static void
+setvareq(s, flags)
+ char *s;
+ int flags;
+{
+ struct var *vp, **vpp;
+
+ vpp = hashvar(s);
+ flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
+ if ((vp = *findvar(vpp, s))) {
+ if (vp->flags & VREADONLY) {
+ size_t len = strchr(s, '=') - s;
+ error("%.*s: is read only", len, s);
+ }
+ INTOFF;
+
+ if (vp->func && (flags & VNOFUNC) == 0)
+ (*vp->func)(strchr(s, '=') + 1);
+
+ if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
+ ckfree(vp->text);
+
+ vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
+ vp->flags |= flags;
+ vp->text = s;
+
+ /*
+ * We could roll this to a function, to handle it as
+ * a regular variable function callback, but why bother?
+ */
+ if (iflag && (vp == &vmpath || (vp == &vmail && !mpathset())))
+ chkmail(1);
+ INTON;
+ return;
+ }
+ /* not found */
+ vp = ckmalloc(sizeof (*vp));
+ vp->flags = flags;
+ vp->text = s;
+ vp->next = *vpp;
+ vp->func = NULL;
+ *vpp = vp;
+}
+
+
+
+/*
+ * Process a linked list of variable assignments.
+ */
+
+static void
+listsetvar(mylist)
+ struct strlist *mylist;
+ {
+ struct strlist *lp;
+
+ INTOFF;
+ for (lp = mylist ; lp ; lp = lp->next) {
+ setvareq(savestr(lp->text), 0);
+ }
+ INTON;
+}
+
+
+
+/*
+ * Find the value of a variable. Returns NULL if not set.
+ */
+
+static char *
+lookupvar(name)
+ const char *name;
+ {
+ struct var *v;
+
+ if ((v = *findvar(hashvar(name), name)) && !(v->flags & VUNSET)) {
+ return strchr(v->text, '=') + 1;
+ }
+ return NULL;
+}
+
+
+
+/*
+ * Search the environment of a builtin command.
+ */
+
+static char *
+bltinlookup(name)
+ const char *name;
+{
+ struct strlist *sp;
+
+ for (sp = cmdenviron ; sp ; sp = sp->next) {
+ if (varequal(sp->text, name))
+ return strchr(sp->text, '=') + 1;
+ }
+ return lookupvar(name);
+}
+
+
+
+/*
+ * Generate a list of exported variables. This routine is used to construct
+ * the third argument to execve when executing a program.
+ */
+
+static char **
+environment() {
+ int nenv;
+ struct var **vpp;
+ struct var *vp;
+ char **env;
+ char **ep;
+
+ nenv = 0;
+ for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
+ for (vp = *vpp ; vp ; vp = vp->next)
+ if (vp->flags & VEXPORT)
+ nenv++;
+ }
+ ep = env = stalloc((nenv + 1) * sizeof *env);
+ for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
+ for (vp = *vpp ; vp ; vp = vp->next)
+ if (vp->flags & VEXPORT)
+ *ep++ = vp->text;
+ }
+ *ep = NULL;
+ return env;
+}
+
+
+/*
+ * Called when a shell procedure is invoked to clear out nonexported
+ * variables. It is also necessary to reallocate variables of with
+ * VSTACK set since these are currently allocated on the stack.
+ */
+
+#ifdef mkinit
+static void shprocvar __P((void));
+
+SHELLPROC {
+ shprocvar();
+}
+#endif
+
+static void
+shprocvar() {
+ struct var **vpp;
+ struct var *vp, **prev;
+
+ for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
+ for (prev = vpp ; (vp = *prev) != NULL ; ) {
+ if ((vp->flags & VEXPORT) == 0) {
+ *prev = vp->next;
+ if ((vp->flags & VTEXTFIXED) == 0)
+ ckfree(vp->text);
+ if ((vp->flags & VSTRFIXED) == 0)
+ ckfree(vp);
+ } else {
+ if (vp->flags & VSTACK) {
+ vp->text = savestr(vp->text);
+ vp->flags &=~ VSTACK;
+ }
+ prev = &vp->next;
+ }
+ }
+ }
+ initvar();
+}
+
+
+
+/*
+ * Command to list all variables which are set. Currently this command
+ * is invoked from the set command when the set command is called without
+ * any variables.
+ */
+
+static int
+showvarscmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ showvars(nullstr, VUNSET, VUNSET);
+ return 0;
+}
+
+
+
+/*
+ * The export and readonly commands.
+ */
+
+static int
+exportcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ struct var *vp;
+ char *name;
+ const char *p;
+ int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
+ int pflag;
+
+ listsetvar(cmdenviron);
+ pflag = (nextopt("p") == 'p');
+ if (argc > 1 && !pflag) {
+ while ((name = *argptr++) != NULL) {
+ if ((p = strchr(name, '=')) != NULL) {
+ p++;
+ } else {
+ if ((vp = *findvar(hashvar(name), name))) {
+ vp->flags |= flag;
+ goto found;
+ }
+ }
+ setvar(name, p, flag);
+found:;
+ }
+ } else {
+ showvars(argv[0], flag, 0);
+ }
+ return 0;
+}
+
+
+/*
+ * The "local" command.
+ */
+
+static int
+localcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char *name;
+
+ if (! in_function())
+ error("Not in a function");
+ while ((name = *argptr++) != NULL) {
+ mklocal(name);
+ }
+ return 0;
+}
+
+
+/*
+ * Make a variable a local variable. When a variable is made local, it's
+ * value and flags are saved in a localvar structure. The saved values
+ * will be restored when the shell function returns. We handle the name
+ * "-" as a special case.
+ */
+
+static void
+mklocal(name)
+ char *name;
+ {
+ struct localvar *lvp;
+ struct var **vpp;
+ struct var *vp;
+
+ INTOFF;
+ lvp = ckmalloc(sizeof (struct localvar));
+ if (name[0] == '-' && name[1] == '\0') {
+ char *p;
+ p = ckmalloc(sizeof optlist);
+ lvp->text = memcpy(p, optlist, sizeof optlist);
+ vp = NULL;
+ } else {
+ vpp = hashvar(name);
+ vp = *findvar(vpp, name);
+ if (vp == NULL) {
+ if (strchr(name, '='))
+ setvareq(savestr(name), VSTRFIXED);
+ else
+ setvar(name, NULL, VSTRFIXED);
+ vp = *vpp; /* the new variable */
+ lvp->text = NULL;
+ lvp->flags = VUNSET;
+ } else {
+ lvp->text = vp->text;
+ lvp->flags = vp->flags;
+ vp->flags |= VSTRFIXED|VTEXTFIXED;
+ if (strchr(name, '='))
+ setvareq(savestr(name), 0);
+ }
+ }
+ lvp->vp = vp;
+ lvp->next = localvars;
+ localvars = lvp;
+ INTON;
+}
+
+
+/*
+ * Called after a function returns.
+ */
+
+static void
+poplocalvars() {
+ struct localvar *lvp;
+ struct var *vp;
+
+ while ((lvp = localvars) != NULL) {
+ localvars = lvp->next;
+ vp = lvp->vp;
+ if (vp == NULL) { /* $- saved */
+ memcpy(optlist, lvp->text, sizeof optlist);
+ ckfree(lvp->text);
+ } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
+ (void)unsetvar(vp->text);
+ } else {
+ if ((vp->flags & VTEXTFIXED) == 0)
+ ckfree(vp->text);
+ vp->flags = lvp->flags;
+ vp->text = lvp->text;
+ }
+ ckfree(lvp);
+ }
+}
+
+
+static int
+setvarcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ if (argc <= 2)
+ return unsetcmd(argc, argv);
+ else if (argc == 3)
+ setvar(argv[1], argv[2], 0);
+ else
+ error("List assignment not implemented");
+ return 0;
+}
+
+
+/*
+ * The unset builtin command. We unset the function before we unset the
+ * variable to allow a function to be unset when there is a readonly variable
+ * with the same name.
+ */
+
+static int
+unsetcmd(argc, argv)
+ int argc;
+ char **argv;
+{
+ char **ap;
+ int i;
+ int flg_func = 0;
+ int flg_var = 0;
+ int ret = 0;
+
+ while ((i = nextopt("vf")) != '\0') {
+ if (i == 'f')
+ flg_func = 1;
+ else
+ flg_var = 1;
+ }
+ if (flg_func == 0 && flg_var == 0)
+ flg_var = 1;
+
+ for (ap = argptr; *ap ; ap++) {
+ if (flg_func)
+ unsetfunc(*ap);
+ if (flg_var)
+ ret |= unsetvar(*ap);
+ }
+ return ret;
+}
+
+
+/*
+ * Unset the specified variable.
+ */
+
+static int
+unsetvar(s)
+ const char *s;
+ {
+ struct var **vpp;
+ struct var *vp;
+
+ vpp = findvar(hashvar(s), s);
+ vp = *vpp;
+ if (vp) {
+ if (vp->flags & VREADONLY)
+ return (1);
+ INTOFF;
+ if (*(strchr(vp->text, '=') + 1) != '\0')
+ setvar(s, nullstr, 0);
+ vp->flags &= ~VEXPORT;
+ vp->flags |= VUNSET;
+ if ((vp->flags & VSTRFIXED) == 0) {
+ if ((vp->flags & VTEXTFIXED) == 0)
+ ckfree(vp->text);
+ *vpp = vp->next;
+ ckfree(vp);
+ }
+ INTON;
+ return (0);
+ }
+
+ return (0);
+}
+
+
+
+/*
+ * Find the appropriate entry in the hash table from the name.
+ */
+
+static struct var **
+hashvar(p)
+ const char *p;
+ {
+ unsigned int hashval;
+
+ hashval = ((unsigned char) *p) << 4;
+ while (*p && *p != '=')
+ hashval += (unsigned char) *p++;
+ return &vartab[hashval % VTABSIZE];
+}
+
+
+
+/*
+ * Returns true if the two strings specify the same varable. The first
+ * variable name is terminated by '='; the second may be terminated by
+ * either '=' or '\0'.
+ */
+
+static int
+varequal(p, q)
+ const char *p, *q;
+ {
+ while (*p == *q++) {
+ if (*p++ == '=')
+ return 1;
+ }
+ if (*p == '=' && *(q - 1) == '\0')
+ return 1;
+ return 0;
+}
+
+static void
+showvars(const char *myprefix, int mask, int xor)
+{
+ struct var **vpp;
+ struct var *vp;
+ const char *sep = myprefix == nullstr ? myprefix : spcstr;
+
+ for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
+ for (vp = *vpp ; vp ; vp = vp->next) {
+ if ((vp->flags & mask) ^ xor) {
+ char *p;
+ int len;
+
+ p = strchr(vp->text, '=') + 1;
+ len = p - vp->text;
+ p = single_quote(p);
+
+ out1fmt(
+ "%s%s%.*s%s\n", myprefix, sep, len,
+ vp->text, p
+ );
+ stunalloc(p);
+ }
+ }
+ }
+}
+
+static struct var **
+findvar(struct var **vpp, const char *name)
+{
+ for (; *vpp; vpp = &(*vpp)->next) {
+ if (varequal((*vpp)->text, name)) {
+ break;
+ }
+ }
+ return vpp;
+}
+
+/*
+ * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
+ * This file contains code for the times builtin.
+ * $Id: ash.c,v 1.1 2001/06/28 07:25:15 andersen Exp $
+ */
+static int timescmd (int argc, char **argv)
+{
+ struct tms buf;
+ long int clk_tck = sysconf(_SC_CLK_TCK);
+
+ times(&buf);
+ printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
+ (int) (buf.tms_utime / clk_tck / 60),
+ ((double) buf.tms_utime) / clk_tck,
+ (int) (buf.tms_stime / clk_tck / 60),
+ ((double) buf.tms_stime) / clk_tck,
+ (int) (buf.tms_cutime / clk_tck / 60),
+ ((double) buf.tms_cutime) / clk_tck,
+ (int) (buf.tms_cstime / clk_tck / 60),
+ ((double) buf.tms_cstime) / clk_tck);
+ return 0;
+}
+
projects / platform / upstream / busybox.git / commitdiff