--- /dev/null
+Index: editors/Makefile.in
+===================================================================
+--- editors/Makefile.in (revision 10144)
++++ editors/Makefile.in (working copy)
+@@ -24,8 +24,9 @@
+ srcdir=$(top_srcdir)/editors
+
+ EDITOR-y:=
+-EDITOR-$(CONFIG_AWK) += awk.o
+-EDITOR-$(CONFIG_PATCH) += patch.o
++EDITOR-$(CONFIG_AWK) += awk.o
++EDITOR-$(CONFIG_ED) += ed.o
++EDITOR-$(CONFIG_PATCH) += patch.o
+ EDITOR-$(CONFIG_SED) += sed.o
+ EDITOR-$(CONFIG_VI) += vi.o
+ EDITOR_SRC:= $(EDITOR-y)
+Index: editors/Config.in
+===================================================================
+--- editors/Config.in (revision 10144)
++++ editors/Config.in (working copy)
+@@ -20,6 +20,12 @@
+ Enable math functions of the Awk programming language.
+ NOTE: This will require libm to be present for linking.
+
++config CONFIG_ED
++ bool "ed"
++ default n
++ help
++ ed
++
+ config CONFIG_PATCH
+ bool "patch"
+ default n
+Index: include/usage.h
+===================================================================
+--- include/usage.h (revision 10151)
++++ include/usage.h (working copy)
+@@ -556,6 +561,9 @@
+ "$ echo \"Erik\\nis\\ncool\"\n" \
+ "Erik\\nis\\ncool\n")
+
++#define ed_trivial_usage ""
++#define ed_full_usage ""
++
+ #define env_trivial_usage \
+ "[-iu] [-] [name=value]... [command]"
+ #define env_full_usage \
+Index: include/applets.h
+===================================================================
+--- include/applets.h (revision 10151)
++++ include/applets.h (working copy)
+@@ -179,6 +179,9 @@
+ #ifdef CONFIG_ECHO
+ APPLET(echo, echo_main, _BB_DIR_BIN, _BB_SUID_NEVER)
+ #endif
++#ifdef CONFIG_ED
++ APPLET(ed, ed_main, _BB_DIR_BIN, _BB_SUID_NEVER)
++#endif
+ #if defined(CONFIG_FEATURE_GREP_EGREP_ALIAS)
+ APPLET_NOUSAGE("egrep", grep_main, _BB_DIR_BIN, _BB_SUID_NEVER)
+ #endif
+--- /dev/null 2005-04-22 11:15:01.120978184 -0400
++++ editors/ed.c 2005-04-22 11:16:00.000000000 -0400
+@@ -0,0 +1,3120 @@
++/* main.c: This file contains the main control and user-interface routines
++ for the ed line editor. */
++/* ed line editor.
++ Copyright (C) 1993, 1994 Andrew Moore, Talke Studio
++ All Rights Reserved
++
++ This program is free software; you can redistribute it and/or modify
++ it under the terms of the GNU General Public License as published by
++ the Free Software Foundation; either version 2, or (at your option)
++ any later version.
++
++ This program is distributed in the hope that it will be useful, but
++ WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ General Public License for more details.
++
++ You should have received a copy of the GNU General Public License
++ along with this program; if not, write to the Free Software
++ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
++*/
++
++/*
++ * CREDITS
++ *
++ * This program is based on the editor algorithm described in
++ * Brian W. Kernighan and P. J. Plauger's book "Software Tools
++ * in Pascal," Addison-Wesley, 1981.
++ *
++ * The buffering algorithm is attributed to Rodney Ruddock of
++ * the University of Guelph, Guelph, Ontario.
++ *
++ */
++
++#include <errno.h>
++#include <limits.h>
++#include <signal.h>
++#include <stdlib.h>
++#include <stdio.h>
++#include <string.h>
++#include <ctype.h>
++#include <setjmp.h>
++#include <pwd.h>
++#include <unistd.h>
++#include <sys/types.h>
++#include <sys/stat.h>
++#include <sys/file.h>
++#include <sys/ioctl.h>
++
++#include "busybox.h"
++#include "ed.h"
++#include "getopt.h"
++
++jmp_buf env;
++
++/* static buffers */
++char *errmsg; /* error message buffer */
++char stdinbuf[1]; /* stdin buffer */
++char *shcmd; /* shell command buffer */
++int shcmdsz; /* shell command buffer size */
++int shcmdi; /* shell command buffer index */
++char *ibuf; /* ed command-line buffer */
++int ibufsz; /* ed command-line buffer size */
++char *ibufp; /* pointer to ed command-line buffer */
++
++/* global flags */
++int traditional = 0; /* if set, be backwards compatible */
++int garrulous = 0; /* if set, print all error messages */
++int isbinary; /* if set, buffer contains ASCII NULs */
++int isglobal; /* if set, doing a global command */
++int modified; /* if set, buffer modified since last write */
++int mutex = 0; /* if set, signals set "sigflags" */
++int red = 0; /* if set, restrict shell/directory access */
++int scripted = 0; /* if set, suppress diagnostics */
++int sigactive = 0; /* if set, signal handlers are enabled */
++int sigflags = 0; /* if set, signals received while mutex set */
++
++char *old_filename; /* default filename */
++long current_addr; /* current address in editor buffer */
++long addr_last; /* last address in editor buffer */
++int lineno; /* script line number */
++char *prompt; /* command-line prompt */
++char *dps = "*"; /* default command-line prompt */
++long err_status = 0; /* program exit status */
++
++/* The name this program was run with. */
++char *program_name;
++
++/* If non-zero, display usage information and exit. */
++int show_help = 0;
++
++/* If non-zero, print the version on standard output and exit. */
++int show_version = 0;
++
++/* Long options equivalences. */
++struct option long_options[] =
++{
++ {"help", no_argument, &show_help, 1},
++ {"prompt", required_argument, NULL, 'p'},
++ {"quiet", no_argument, NULL, 's'},
++ {"silent", no_argument, NULL, 's'},
++ {"traditional", no_argument, NULL, 'G'},
++ {"version", no_argument, &show_version, 1},
++ {0, 0, 0, 0},
++};
++
++extern int optind;
++extern char *optarg;
++
++/* usage: explain usage */
++
++#if 0
++void
++usage (status)
++ int status;
++{
++ if (status != 0)
++ fprintf (stderr, "Try `%s --help' for more information.\n", program_name);
++ else
++ {
++ printf ("Usage: %s [OPTION]... [FILE]\n", program_name);
++ printf ("\
++\n\
++ -G, --traditional use a few backward compatible features\n\
++ -p, --prompt=STRING use STRING as an interactive prompt\n\
++ -s, -, --quiet, --silent suppress diagnostics\n");
++ printf ("\
++ --help display this help\n\
++ --version output version information\n\
++\n\
++Start edit by reading in FILE if given. Read output of shell command\n\
++if FILE begins with a `!'.\n");
++ }
++ exit (status);
++}
++#endif
++#define usage(x) bb_show_usage()
++
++
++/* ed: line editor */
++int
++ed_main (int argc, char **argv)
++{
++ int c, n;
++ long status = 0;
++
++ program_name = argv[0];
++ red = (n = strlen (argv[0])) > 2 && argv[0][n - 3] == 'r';
++top:
++ while ((c = getopt_long (argc, argv, "Gp:s", long_options, NULL)) != EOF)
++ switch (c)
++ {
++ default:
++ usage (1);
++ case 0:
++ break;
++ case 'G': /* backward compatibility */
++ traditional = 1;
++ break;
++ case 'p': /* set prompt */
++ prompt = optarg;
++ break;
++ case 's': /* run script */
++ scripted = 1;
++ break;
++ }
++ if (show_help)
++ usage (0);
++ argv += optind;
++ argc -= optind;
++ if (argc && **argv == '-')
++ {
++ scripted = 1;
++ if (argc > 1)
++ {
++ optind = 0;
++ goto top;
++ }
++ argv++;
++ argc--;
++ }
++ init_buffers ();
++
++ /* assert: reliable signals! */
++#ifdef SIGWINCH
++ handle_winch (SIGWINCH);
++ if (isatty (0))
++ reliable_signal (SIGWINCH, handle_winch);
++#endif
++ reliable_signal (SIGHUP, signal_hup);
++ reliable_signal (SIGQUIT, SIG_IGN);
++ reliable_signal (SIGINT, signal_int);
++ if ((status = setjmp (env)))
++ {
++ fputs ("\n?\n", stderr);
++ sprintf (errmsg, "Interrupt");
++ }
++ else
++ {
++ sigactive = 1; /* enable signal handlers */
++ if (argc && **argv && is_legal_filename (*argv))
++ {
++ if (read_file (*argv, 0) < 0 && is_regular_file (0))
++ quit (2);
++ else if (**argv != '!')
++ strcpy (old_filename, *argv);
++ }
++ else if (argc)
++ {
++ fputs ("?\n", stderr);
++ if (**argv == '\0')
++ sprintf (errmsg, "Invalid filename");
++ if (is_regular_file (0))
++ quit (2);
++ }
++ }
++ for (;;)
++ {
++ if (status < 0 && garrulous)
++ fprintf (stderr, "%s\n", errmsg);
++ if (prompt)
++ {
++ printf ("%s", prompt);
++ fflush (stdout);
++ }
++ if ((n = get_tty_line ()) < 0)
++ {
++ status = ERR;
++ continue;
++ }
++ else if (n == 0)
++ {
++ if (modified && !scripted)
++ {
++ fputs ("?\n", stderr);
++ sprintf (errmsg, "Warning: file modified");
++ if (is_regular_file (0))
++ {
++ fprintf (stderr, garrulous ?
++ "script, line %d: %s\n" :
++ "", lineno, errmsg);
++ quit (2);
++ }
++ clearerr (stdin);
++ modified = 0;
++ status = EMOD;
++ continue;
++ }
++ else
++ quit (err_status);
++ }
++ else if (ibuf[n - 1] != '\n')
++ {
++ /* discard line */
++ sprintf (errmsg, "Unexpected end-of-file");
++ clearerr (stdin);
++ status = ERR;
++ continue;
++ }
++ isglobal = 0;
++ if ((status = extract_addr_range ()) >= 0 &&
++ (status = exec_command ()) >= 0)
++ if (!status || (status = display_lines (current_addr, current_addr,
++ status)) >= 0)
++ continue;
++ switch (status)
++ {
++ case EOF:
++ quit (err_status);
++ case EMOD:
++ modified = 0;
++ fputs ("?\n", stderr); /* give warning */
++ sprintf (errmsg, "Warning: file modified");
++ if (is_regular_file (0))
++ {
++ fprintf (stderr, garrulous ?
++ "script, line %d: %s\n" :
++ "", lineno, errmsg);
++ quit (2);
++ }
++ break;
++ case FATAL:
++ if (is_regular_file (0))
++ fprintf (stderr, garrulous ?
++ "script, line %d: %s\n" : "",
++ lineno, errmsg);
++ else
++ fprintf (stderr, garrulous ? "%s\n" : "",
++ errmsg);
++ quit (3);
++ default:
++ fputs ("?\n", stderr);
++ if (is_regular_file (0))
++ {
++ fprintf (stderr, garrulous ?
++ "script, line %d: %s\n" : "",
++ lineno, errmsg);
++ quit (4);
++ }
++ break;
++ }
++ err_status = -status;
++ }
++ /*NOTREACHED */
++}
++
++long first_addr, second_addr, addr_cnt;
++
++/* extract_addr_range: get line addresses from the command buffer until an
++ illegal address is seen; return status */
++int
++extract_addr_range ()
++{
++ long addr;
++
++ addr_cnt = 0;
++ first_addr = second_addr = current_addr;
++ while ((addr = next_addr ()) >= 0)
++ {
++ addr_cnt++;
++ first_addr = second_addr;
++ second_addr = addr;
++ if (*ibufp != ',' && *ibufp != ';')
++ break;
++ else if (*ibufp++ == ';')
++ current_addr = addr;
++ }
++ if ((addr_cnt = min (addr_cnt, 2)) == 1 || second_addr != addr)
++ first_addr = second_addr;
++ return (addr == ERR) ? ERR : 0;
++}
++
++
++#define SKIP_BLANKS() \
++ while (isspace (*ibufp) && *ibufp != '\n') \
++ ibufp++
++
++#define MUST_BE_FIRST() \
++ do \
++ { \
++ if (!first) \
++ { \
++ sprintf (errmsg, "Invalid address"); \
++ return ERR; \
++ } \
++ } \
++ while (0)
++
++/* next_addr: return the next line address in the command buffer */
++long
++next_addr ()
++{
++ char *hd;
++ long addr = current_addr;
++ long n;
++ int first = 1;
++ int c;
++
++ SKIP_BLANKS ();
++ for (hd = ibufp;; first = 0)
++ switch (c = *ibufp)
++ {
++ case '+':
++ case '\t':
++ case ' ':
++ case '-':
++ case '^':
++ ibufp++;
++ SKIP_BLANKS ();
++ if (isdigit (*ibufp))
++ {
++ STRTOL (n, ibufp);
++ addr += (c == '-' || c == '^') ? -n : n;
++ }
++ else if (!isspace (c))
++ addr += (c == '-' || c == '^') ? -1 : 1;
++ break;
++ case '0':
++ case '1':
++ case '2':
++ case '3':
++ case '4':
++ case '5':
++ case '6':
++ case '7':
++ case '8':
++ case '9':
++ MUST_BE_FIRST ();
++ STRTOL (addr, ibufp);
++ break;
++ case '.':
++ case '$':
++ MUST_BE_FIRST ();
++ ibufp++;
++ addr = (c == '.') ? current_addr : addr_last;
++ break;
++ case '/':
++ case '?':
++ MUST_BE_FIRST ();
++ if ((addr = get_matching_node_addr (
++ get_compiled_pattern (), c == '/')) < 0)
++ return ERR;
++ else if (c == *ibufp)
++ ibufp++;
++ break;
++ case '\'':
++ MUST_BE_FIRST ();
++ ibufp++;
++ if ((addr = get_marked_node_addr (*ibufp++)) < 0)
++ return ERR;
++ break;
++ case '%':
++ case ',':
++ case ';':
++ if (first)
++ {
++ ibufp++;
++ addr_cnt++;
++ second_addr = (c == ';') ? current_addr : 1;
++ addr = addr_last;
++ break;
++ }
++ /* FALL THROUGH */
++ default:
++ if (ibufp == hd)
++ return EOF;
++ else if (addr < 0 || addr_last < addr)
++ {
++ sprintf (errmsg, "Invalid address");
++ return ERR;
++ }
++ else
++ return addr;
++ }
++ /* NOTREACHED */
++}
++
++
++/* GET_THIRD_ADDR: get a legal address from the command buffer */
++#define GET_THIRD_ADDR(addr) \
++ do \
++ { \
++ long ol1, ol2; \
++ ol1 = first_addr, ol2 = second_addr; \
++ if (extract_addr_range () < 0) \
++ return ERR; \
++ else if (traditional && addr_cnt == 0) \
++ { \
++ sprintf (errmsg, "Destination expected"); \
++ return ERR; \
++ } \
++ else if (second_addr < 0 || addr_last < second_addr) \
++ { \
++ sprintf (errmsg, "Invalid address"); \
++ return ERR; \
++ } \
++ (addr) = second_addr; \
++ first_addr = ol1, second_addr = ol2; \
++ } \
++ while (0)
++
++/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
++#define GET_COMMAND_SUFFIX() \
++ do \
++ { \
++ int done = 0; \
++ do \
++ { \
++ switch (*ibufp) \
++ { \
++ case 'p': \
++ gflag |= GPR, ibufp++; \
++ break; \
++ case 'l': \
++ gflag |= GLS, ibufp++; \
++ break; \
++ case 'n': \
++ gflag |= GNP, ibufp++; \
++ break; \
++ default: \
++ done++; \
++ } \
++ } \
++ while (!done); \
++ if (*ibufp++ != '\n') \
++ { \
++ sprintf (errmsg, "Invalid command suffix"); \
++ return ERR; \
++ } \
++ } \
++ while (0)
++
++/* sflags */
++#define SGG 001 /* complement previous global substitute suffix */
++#define SGP 002 /* complement previous print suffix */
++#define SGR 004 /* use last regex instead of last pat */
++#define SGF 010 /* repeat last substitution */
++
++int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
++
++long rows = 22; /* scroll length: ws_row - 2 */
++
++/* exec_command: execute the next command in command buffer; return print
++ request, if any */
++int
++exec_command ()
++{
++ extern long u_current_addr;
++ extern long u_addr_last;
++
++ static pattern_t *pat = NULL;
++ static int sgflag = 0;
++ static int sgnum = 0;
++
++ pattern_t *tpat;
++ char *fnp;
++ int gflag = 0;
++ int sflags = 0;
++ long addr = 0;
++ int n = 0;
++ int c;
++
++ SKIP_BLANKS ();
++ switch (c = *ibufp++)
++ {
++ case 'a':
++ GET_COMMAND_SUFFIX ();
++ if (!isglobal)
++ clear_undo_stack ();
++ if (append_lines (second_addr) < 0)
++ return ERR;
++ break;
++ case 'c':
++ if (check_addr_range (current_addr, current_addr) < 0)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (!isglobal)
++ clear_undo_stack ();
++ if (delete_lines (first_addr, second_addr) < 0 ||
++ append_lines (current_addr) < 0)
++ return ERR;
++ break;
++ case 'd':
++ if (check_addr_range (current_addr, current_addr) < 0)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (!isglobal)
++ clear_undo_stack ();
++ if (delete_lines (first_addr, second_addr) < 0)
++ return ERR;
++ else if ((addr = INC_MOD (current_addr, addr_last)) != 0)
++ current_addr = addr;
++ break;
++ case 'e':
++ if (modified && !scripted)
++ return EMOD;
++ /* fall through */
++ case 'E':
++ if (addr_cnt > 0)
++ {
++ sprintf (errmsg, "Unexpected address");
++ return ERR;
++ }
++ else if (!isspace (*ibufp))
++ {
++ sprintf (errmsg, "Unexpected command suffix");
++ return ERR;
++ }
++ else if ((fnp = get_filename ()) == NULL)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (delete_lines (1, addr_last) < 0)
++ return ERR;
++ delete_yank_lines ();
++ clear_undo_stack ();
++ if (close_sbuf () < 0)
++ return ERR;
++ else if (open_sbuf () < 0)
++ return FATAL;
++ if (*fnp && *fnp != '!')
++ strcpy (old_filename, fnp);
++ if (traditional && *fnp == '\0' && *old_filename == '\0')
++ {
++ sprintf (errmsg, "No current filename");
++ return ERR;
++ }
++ else if (read_file (*fnp ? fnp : old_filename, 0) < 0)
++ return ERR;
++ clear_undo_stack ();
++ modified = 0;
++ u_current_addr = u_addr_last = -1;
++ break;
++ case 'f':
++ if (addr_cnt > 0)
++ {
++ sprintf (errmsg, "Unexpected address");
++ return ERR;
++ }
++ else if (!isspace (*ibufp))
++ {
++ sprintf (errmsg, "Unexpected command suffix");
++ return ERR;
++ }
++ else if ((fnp = get_filename ()) == NULL)
++ return ERR;
++ else if (*fnp == '!')
++ {
++ sprintf (errmsg, "Invalid redirection");
++ return ERR;
++ }
++ GET_COMMAND_SUFFIX ();
++ if (*fnp)
++ strcpy (old_filename, fnp);
++ printf ("%s\n", strip_escapes (old_filename));
++ break;
++ case 'g':
++ case 'v':
++ case 'G':
++ case 'V':
++ if (isglobal)
++ {
++ sprintf (errmsg, "Cannot nest global commands");
++ return ERR;
++ }
++ else if (check_addr_range (1, addr_last) < 0)
++ return ERR;
++ else if (build_active_list (c == 'g' || c == 'G') < 0)
++ return ERR;
++ else if ((n = (c == 'G' || c == 'V')))
++ GET_COMMAND_SUFFIX ();
++ isglobal++;
++ if (exec_global (n, gflag) < 0)
++ return ERR;
++ break;
++ case 'h':
++ if (addr_cnt > 0)
++ {
++ sprintf (errmsg, "Unexpected address");
++ return ERR;
++ }
++ GET_COMMAND_SUFFIX ();
++ if (*errmsg)
++ fprintf (stderr, "%s\n", errmsg);
++ break;
++ case 'H':
++ if (addr_cnt > 0)
++ {
++ sprintf (errmsg, "Unexpected address");
++ return ERR;
++ }
++ GET_COMMAND_SUFFIX ();
++ if ((garrulous = 1 - garrulous) && *errmsg)
++ fprintf (stderr, "%s\n", errmsg);
++ break;
++ case 'i':
++ if (second_addr == 0)
++ {
++ sprintf (errmsg, "Invalid address");
++ return ERR;
++ }
++ GET_COMMAND_SUFFIX ();
++ if (!isglobal)
++ clear_undo_stack ();
++ if (append_lines (second_addr - 1) < 0)
++ return ERR;
++ break;
++ case 'j':
++ if (check_addr_range (current_addr, current_addr + 1) < 0)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (!isglobal)
++ clear_undo_stack ();
++ if (first_addr != second_addr &&
++ join_lines (first_addr, second_addr) < 0)
++ return ERR;
++ break;
++ case 'k':
++ c = *ibufp++;
++ if (second_addr == 0)
++ {
++ sprintf (errmsg, "Invalid address");
++ return ERR;
++ }
++ GET_COMMAND_SUFFIX ();
++ if (mark_line_node (get_addressed_line_node (second_addr), c) < 0)
++ return ERR;
++ break;
++ case 'l':
++ if (check_addr_range (current_addr, current_addr) < 0)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (display_lines (first_addr, second_addr, gflag | GLS) < 0)
++ return ERR;
++ gflag = 0;
++ break;
++ case 'm':
++ if (check_addr_range (current_addr, current_addr) < 0)
++ return ERR;
++ GET_THIRD_ADDR (addr);
++ if (first_addr <= addr && addr < second_addr)
++ {
++ sprintf (errmsg, "Invalid destination");
++ return ERR;
++ }
++ GET_COMMAND_SUFFIX ();
++ if (!isglobal)
++ clear_undo_stack ();
++ if (move_lines (addr) < 0)
++ return ERR;
++ break;
++ case 'n':
++ if (check_addr_range (current_addr, current_addr) < 0)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (display_lines (first_addr, second_addr, gflag | GNP) < 0)
++ return ERR;
++ gflag = 0;
++ break;
++ case 'p':
++ if (check_addr_range (current_addr, current_addr) < 0)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (display_lines (first_addr, second_addr, gflag | GPR) < 0)
++ return ERR;
++ gflag = 0;
++ break;
++ case 'P':
++ if (addr_cnt > 0)
++ {
++ sprintf (errmsg, "Unexpected address");
++ return ERR;
++ }
++ GET_COMMAND_SUFFIX ();
++ prompt = prompt ? NULL : optarg ? optarg : dps;
++ break;
++ case 'q':
++ case 'Q':
++ if (addr_cnt > 0)
++ {
++ sprintf (errmsg, "Unexpected address");
++ return ERR;
++ }
++ GET_COMMAND_SUFFIX ();
++ gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
++ break;
++ case 'r':
++ if (!isspace (*ibufp))
++ {
++ sprintf (errmsg, "Unexpected command suffix");
++ return ERR;
++ }
++ else if (addr_cnt == 0)
++ second_addr = addr_last;
++ if ((fnp = get_filename ()) == NULL)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (!isglobal)
++ clear_undo_stack ();
++ if (*old_filename == '\0' && *fnp != '!')
++ strcpy (old_filename, fnp);
++ if (traditional && *fnp == '\0' && *old_filename == '\0')
++ {
++ sprintf (errmsg, "No current filename");
++ return ERR;
++ }
++ if ((addr = read_file (*fnp ? fnp : old_filename, second_addr)) < 0)
++ return ERR;
++ else if (addr && addr != addr_last)
++ modified = 1;
++ break;
++ case 's':
++ do
++ {
++ switch (*ibufp)
++ {
++ case '\n':
++ sflags |= SGF;
++ break;
++ case 'g':
++ sflags |= SGG;
++ ibufp++;
++ break;
++ case 'p':
++ sflags |= SGP;
++ ibufp++;
++ break;
++ case 'r':
++ sflags |= SGR;
++ ibufp++;
++ break;
++ case '0':
++ case '1':
++ case '2':
++ case '3':
++ case '4':
++ case '5':
++ case '6':
++ case '7':
++ case '8':
++ case '9': {
++ long sgnum_long;
++ STRTOL (sgnum_long, ibufp);
++ sgnum = sgnum_long;
++ sflags |= SGF;
++ sgflag &= ~GSG; /* override GSG */
++ break;
++ }
++ default:
++ if (sflags)
++ {
++ sprintf (errmsg, "Invalid command suffix");
++ return ERR;
++ }
++ }
++ }
++ while (sflags && *ibufp != '\n');
++ if (sflags && !pat)
++ {
++ sprintf (errmsg, "No previous substitution");
++ return ERR;
++ }
++ else if (sflags & SGG)
++ sgnum = 0; /* override numeric arg */
++ if (*ibufp != '\n' && *(ibufp + 1) == '\n')
++ {
++ sprintf (errmsg, "Invalid pattern delimiter");
++ return ERR;
++ }
++ tpat = pat;
++ SPL1 ();
++ if ((!sflags || (sflags & SGR)) &&
++ (tpat = get_compiled_pattern ()) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ else if (tpat != pat)
++ {
++ if (pat)
++ {
++ regfree (pat);
++ free (pat);
++ }
++ pat = tpat;
++ patlock = 1; /* reserve pattern */
++ }
++ SPL0 ();
++ if (!sflags && extract_subst_tail (&sgflag, &sgnum) < 0)
++ return ERR;
++ else if (isglobal)
++ sgflag |= GLB;
++ else
++ sgflag &= ~GLB;
++ if (sflags & SGG)
++ sgflag ^= GSG;
++ if (sflags & SGP)
++ sgflag ^= GPR, sgflag &= ~(GLS | GNP);
++ do
++ {
++ switch (*ibufp)
++ {
++ case 'p':
++ sgflag |= GPR, ibufp++;
++ break;
++ case 'l':
++ sgflag |= GLS, ibufp++;
++ break;
++ case 'n':
++ sgflag |= GNP, ibufp++;
++ break;
++ default:
++ n++;
++ }
++ }
++ while (!n);
++ if (check_addr_range (current_addr, current_addr) < 0)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (!isglobal)
++ clear_undo_stack ();
++ if (search_and_replace (pat, sgflag, sgnum) < 0)
++ return ERR;
++ break;
++ case 't':
++ if (check_addr_range (current_addr, current_addr) < 0)
++ return ERR;
++ GET_THIRD_ADDR (addr);
++ GET_COMMAND_SUFFIX ();
++ if (!isglobal)
++ clear_undo_stack ();
++ if (copy_lines (addr) < 0)
++ return ERR;
++ break;
++ case 'u':
++ if (addr_cnt > 0)
++ {
++ sprintf (errmsg, "Unexpected address");
++ return ERR;
++ }
++ GET_COMMAND_SUFFIX ();
++ if (pop_undo_stack () < 0)
++ return ERR;
++ break;
++ case 'w':
++ case 'W':
++ if ((n = *ibufp) == 'q' || n == 'Q')
++ {
++ gflag = EOF;
++ ibufp++;
++ }
++ if (!isspace (*ibufp))
++ {
++ sprintf (errmsg, "Unexpected command suffix");
++ return ERR;
++ }
++ else if ((fnp = get_filename ()) == NULL)
++ return ERR;
++ if (addr_cnt == 0 && !addr_last)
++ first_addr = second_addr = 0;
++ else if (check_addr_range (1, addr_last) < 0)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (*old_filename == '\0' && *fnp != '!')
++ strcpy (old_filename, fnp);
++ if (traditional && *fnp == '\0' && *old_filename == '\0')
++ {
++ sprintf (errmsg, "No current filename");
++ return ERR;
++ }
++ if ((addr = write_file (*fnp ? fnp : old_filename,
++ (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
++ return ERR;
++ else if (addr == addr_last)
++ modified = 0;
++ else if (modified && !scripted && n == 'q')
++ gflag = EMOD;
++ break;
++ case 'x':
++ if (second_addr < 0 || addr_last < second_addr)
++ {
++ sprintf (errmsg, "Invalid address");
++ return ERR;
++ }
++ GET_COMMAND_SUFFIX ();
++ if (!isglobal)
++ clear_undo_stack ();
++ if (put_lines (second_addr) < 0)
++ return ERR;
++ break;
++ case 'y':
++ if (check_addr_range (current_addr, current_addr) < 0)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (yank_lines (first_addr, second_addr) < 0)
++ return ERR;
++ break;
++ case 'z':
++ if (check_addr_range
++ (first_addr = 1, current_addr + (traditional ? 1 : !isglobal)) < 0)
++ return ERR;
++ else if ('0' < *ibufp && *ibufp <= '9')
++ STRTOL (rows, ibufp);
++ GET_COMMAND_SUFFIX ();
++ if (display_lines (second_addr, min (addr_last,
++ second_addr + rows), gflag) < 0)
++ return ERR;
++ gflag = 0;
++ break;
++ case '=':
++ GET_COMMAND_SUFFIX ();
++ printf ("%ld\n", addr_cnt ? second_addr : addr_last);
++ break;
++ case '!':
++ if (addr_cnt > 0)
++ {
++ sprintf (errmsg, "Unexpected address");
++ return ERR;
++ }
++ else if ((sflags = get_shell_command ()) < 0)
++ return ERR;
++ GET_COMMAND_SUFFIX ();
++ if (sflags)
++ printf ("%s\n", shcmd + 1);
++ system (shcmd + 1);
++ if (!scripted)
++ printf ("!\n");
++ break;
++ case '\n':
++ if (check_addr_range
++ (first_addr = 1, current_addr + (traditional ? 1 : !isglobal)) < 0 ||
++ display_lines (second_addr, second_addr, 0) < 0)
++ return ERR;
++ break;
++ case '#':
++ while (*ibufp++ != '\n')
++ ;
++ break;
++ default:
++ sprintf (errmsg, "Unknown command");
++ return ERR;
++ }
++ return gflag;
++}
++
++
++/* check_addr_range: return status of address range check */
++int
++check_addr_range (n, m)
++ long n, m;
++{
++ if (addr_cnt == 0)
++ {
++ first_addr = n;
++ second_addr = m;
++ }
++ if (first_addr > second_addr || 1 > first_addr ||
++ second_addr > addr_last)
++ {
++ sprintf (errmsg, "Invalid address");
++ return ERR;
++ }
++ return 0;
++}
++
++
++/* get_matching_node_addr: return the address of the next line matching a
++ pattern in a given direction. wrap around begin/end of editor buffer if
++ necessary */
++long
++get_matching_node_addr (pat, dir)
++ pattern_t *pat;
++ int dir;
++{
++ char *s;
++ long n = current_addr;
++ line_t *lp;
++
++ if (!pat)
++ return ERR;
++ do
++ {
++ if ((n = dir ? INC_MOD (n, addr_last) : DEC_MOD (n, addr_last)))
++ {
++ lp = get_addressed_line_node (n);
++ if ((s = get_sbuf_line (lp)) == NULL)
++ return ERR;
++ if (isbinary)
++ NUL_TO_NEWLINE (s, lp->len);
++ if (!regexec (pat, s, 0, NULL, 0))
++ return n;
++ }
++ }
++ while (n != current_addr);
++ sprintf (errmsg, "No match");
++ return ERR;
++}
++
++
++/* get_filename: return pointer to copy of filename in the command buffer */
++char *
++get_filename ()
++{
++ static char *file = NULL;
++ static int filesz = 0;
++
++ int n;
++
++ if (*ibufp != '\n')
++ {
++ SKIP_BLANKS ();
++ if (*ibufp == '\n')
++ {
++ sprintf (errmsg, "Invalid filename");
++ return NULL;
++ }
++ else if ((ibufp = get_extended_line (&n, 1)) == NULL)
++ return NULL;
++ else if (*ibufp == '!')
++ {
++ ibufp++;
++ if ((n = get_shell_command ()) < 0)
++ return NULL;
++ if (n)
++ printf ("%s\n", shcmd + 1);
++ return shcmd;
++ }
++ else if (n > PATH_MAX)
++ {
++ sprintf (errmsg, "Filename too long");
++ return NULL;
++ }
++ }
++ else if (!traditional && *old_filename == '\0')
++ {
++ sprintf (errmsg, "No current filename");
++ return NULL;
++ }
++ REALLOC (file, filesz, PATH_MAX + 1, NULL);
++ for (n = 0; *ibufp != '\n';)
++ file[n++] = *ibufp++;
++ file[n] = '\0';
++ return is_legal_filename (file) ? file : NULL;
++}
++
++
++/* get_shell_command: read a shell command from stdin; return substitution
++ status */
++int
++get_shell_command ()
++{
++ static char *buf = NULL;
++ static int n = 0;
++
++ char *s; /* substitution char pointer */
++ int i = 0;
++ int j = 0;
++
++ if (red)
++ {
++ sprintf (errmsg, "Shell access restricted");
++ return ERR;
++ }
++ else if ((s = ibufp = get_extended_line (&j, 1)) == NULL)
++ return ERR;
++ REALLOC (buf, n, j + 1, ERR);
++ buf[i++] = '!'; /* prefix command w/ bang */
++ while (*ibufp != '\n')
++ switch (*ibufp)
++ {
++ default:
++ REALLOC (buf, n, i + 2, ERR);
++ buf[i++] = *ibufp;
++ if (*ibufp++ == '\\')
++ buf[i++] = *ibufp++;
++ break;
++ case '!':
++ if (s != ibufp)
++ {
++ REALLOC (buf, n, i + 1, ERR);
++ buf[i++] = *ibufp++;
++ }
++ else if (shcmd == NULL || (traditional && *(shcmd + 1) == '\0'))
++ {
++ sprintf (errmsg, "No previous command");
++ return ERR;
++ }
++ else
++ {
++ REALLOC (buf, n, i + shcmdi, ERR);
++ for (s = shcmd + 1; s < shcmd + shcmdi;)
++ buf[i++] = *s++;
++ s = ibufp++;
++ }
++ break;
++ case '%':
++ if (*old_filename == '\0')
++ {
++ sprintf (errmsg, "No current filename");
++ return ERR;
++ }
++ j = strlen (s = strip_escapes (old_filename));
++ REALLOC (buf, n, i + j, ERR);
++ while (j--)
++ buf[i++] = *s++;
++ s = ibufp++;
++ break;
++ }
++ REALLOC (shcmd, shcmdsz, i + 1, ERR);
++ memcpy (shcmd, buf, i);
++ shcmd[shcmdi = i] = '\0';
++ return *s == '!' || *s == '%';
++}
++
++
++/* append_lines: insert text from stdin to after line n; stop when either a
++ single period is read or EOF; return status */
++int
++append_lines (n)
++ long n;
++{
++ int l;
++ char *lp = ibuf;
++ char *eot;
++ undo_t *up = NULL;
++
++ for (current_addr = n;;)
++ {
++ if (!isglobal)
++ {
++ if ((l = get_tty_line ()) < 0)
++ return ERR;
++ else if (l == 0 || ibuf[l - 1] != '\n')
++ {
++ clearerr (stdin);
++ return l ? EOF : 0;
++ }
++ lp = ibuf;
++ }
++ else if (*(lp = ibufp) == '\0')
++ return 0;
++ else
++ {
++ while (*ibufp++ != '\n')
++ ;
++ l = ibufp - lp;
++ }
++ if (l == 2 && lp[0] == '.' && lp[1] == '\n')
++ {
++ return 0;
++ }
++ eot = lp + l;
++ SPL1 ();
++ do
++ {
++ if ((lp = put_sbuf_line (lp)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ else if (up)
++ up->t = get_addressed_line_node (current_addr);
++ else if ((up = push_undo_stack (UADD, current_addr,
++ current_addr)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ }
++ while (lp != eot);
++ modified = 1;
++ SPL0 ();
++ }
++ /* NOTREACHED */
++}
++
++
++/* join_lines: replace a range of lines with the joined text of those lines */
++int
++join_lines (from, to)
++ long from;
++ long to;
++{
++ static char *buf = NULL;
++ static int n;
++
++ char *s;
++ int size = 0;
++ line_t *bp, *ep;
++
++ ep = get_addressed_line_node (INC_MOD (to, addr_last));
++ bp = get_addressed_line_node (from);
++ for (; bp != ep; bp = bp->q_forw)
++ {
++ if ((s = get_sbuf_line (bp)) == NULL)
++ return ERR;
++ REALLOC (buf, n, size + bp->len, ERR);
++ memcpy (buf + size, s, bp->len);
++ size += bp->len;
++ }
++ REALLOC (buf, n, size + 2, ERR);
++ memcpy (buf + size, "\n", 2);
++ if (delete_lines (from, to) < 0)
++ return ERR;
++ current_addr = from - 1;
++ SPL1 ();
++ if (put_sbuf_line (buf) == NULL ||
++ push_undo_stack (UADD, current_addr, current_addr) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ modified = 1;
++ SPL0 ();
++ return 0;
++}
++
++
++/* move_lines: move a range of lines */
++int
++move_lines (addr)
++ long addr;
++{
++ line_t *b1, *a1, *b2, *a2;
++ long n = INC_MOD (second_addr, addr_last);
++ long p = first_addr - 1;
++ int done = (addr == first_addr - 1 || addr == second_addr);
++
++ SPL1 ();
++ if (done)
++ {
++ a2 = get_addressed_line_node (n);
++ b2 = get_addressed_line_node (p);
++ current_addr = second_addr;
++ }
++ else if (push_undo_stack (UMOV, p, n) == NULL ||
++ push_undo_stack (UMOV, addr, INC_MOD (addr, addr_last)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ else
++ {
++ a1 = get_addressed_line_node (n);
++ if (addr < first_addr)
++ {
++ b1 = get_addressed_line_node (p);
++ b2 = get_addressed_line_node (addr);
++ /* this get_addressed_line_node last! */
++ }
++ else
++ {
++ b2 = get_addressed_line_node (addr);
++ b1 = get_addressed_line_node (p);
++ /* this get_addressed_line_node last! */
++ }
++ a2 = b2->q_forw;
++ REQUE (b2, b1->q_forw);
++ REQUE (a1->q_back, a2);
++ REQUE (b1, a1);
++ current_addr = addr + ((addr < first_addr) ?
++ second_addr - first_addr + 1 : 0);
++ }
++ if (isglobal)
++ unset_active_nodes (b2->q_forw, a2);
++ modified = 1;
++ SPL0 ();
++ return 0;
++}
++
++
++/* copy_lines: copy a range of lines; return status */
++int
++copy_lines (addr)
++ long addr;
++{
++ line_t *lp, *np = get_addressed_line_node (first_addr);
++ undo_t *up = NULL;
++ long n = second_addr - first_addr + 1;
++ long m = 0;
++
++ current_addr = addr;
++ if (first_addr <= addr && addr < second_addr)
++ {
++ n = addr - first_addr + 1;
++ m = second_addr - addr;
++ }
++ for (; n > 0; n = m, m = 0, np = get_addressed_line_node (current_addr + 1))
++ for (; n-- > 0; np = np->q_forw)
++ {
++ SPL1 ();
++ if ((lp = dup_line_node (np)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ add_line_node (lp);
++ if (up)
++ up->t = lp;
++ else if ((up = push_undo_stack (UADD, current_addr,
++ current_addr)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ modified = 1;
++ SPL0 ();
++ }
++ return 0;
++}
++
++
++/* delete_lines: delete a range of lines */
++int
++delete_lines (from, to)
++ long from, to;
++{
++ line_t *n, *p;
++
++ if (yank_lines (from, to) < 0)
++ return ERR;
++ SPL1 ();
++ if (push_undo_stack (UDEL, from, to) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ n = get_addressed_line_node (INC_MOD (to, addr_last));
++ p = get_addressed_line_node (from - 1);
++ /* this get_addressed_line_node last! */
++ if (isglobal)
++ unset_active_nodes (p->q_forw, n);
++ REQUE (p, n);
++ addr_last -= to - from + 1;
++ current_addr = from - 1;
++ modified = 1;
++ SPL0 ();
++ return 0;
++}
++
++
++int dlcnt = 0; /* # of lines displayed */
++
++/* display_lines: print a range of lines to stdout */
++int
++display_lines (from, to, gflag)
++ long from;
++ long to;
++ int gflag;
++{
++ line_t *bp;
++ line_t *ep;
++ char *s;
++
++ if (!from)
++ {
++ sprintf (errmsg, "Invalid address");
++ return ERR;
++ }
++ ep = get_addressed_line_node (INC_MOD (to, addr_last));
++ bp = get_addressed_line_node (from);
++ for (dlcnt = 0; bp != ep; bp = bp->q_forw)
++ {
++ if ((s = get_sbuf_line (bp)) == NULL)
++ return ERR;
++ else if (put_tty_line (s, bp->len, current_addr = from++, gflag) < 0)
++ return ERR;
++ else if (!traditional && !scripted && !isglobal &&
++ bp->q_forw != ep && ++dlcnt > rows)
++ {
++ dlcnt = 0;
++ fputs ("Press <RETURN> to continue... ", stdout);
++ fflush (stdout);
++ if (get_tty_line () < 0)
++ return ERR;
++ }
++ }
++ return 0;
++}
++
++
++line_t yank_buffer_head; /* head of yank buffer */
++
++/* yank_lines: copy a range of lines to the cut buffer */
++int
++yank_lines (from, to)
++ long from;
++ long to;
++{
++ line_t *bp, *cp, *ep, *lp;
++
++
++ delete_yank_lines ();
++ ep = get_addressed_line_node (INC_MOD (to, addr_last));
++ bp = get_addressed_line_node (from);
++ for (lp = &yank_buffer_head; bp != ep; bp = bp->q_forw, lp = cp)
++ {
++ SPL1 ();
++ if ((cp = dup_line_node (bp)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ INSQUE (cp, lp);
++ SPL0 ();
++ }
++ return 0;
++}
++
++
++/* delete_yank_lines: delete lines from the yank buffer */
++void
++delete_yank_lines ()
++{
++ line_t *cp, *lp;
++
++
++ for (lp = yank_buffer_head.q_forw; lp != &yank_buffer_head; lp = cp)
++ {
++ SPL1 ();
++ cp = lp->q_forw;
++ REQUE (lp->q_back, lp->q_forw);
++ free (lp);
++ SPL0 ();
++ }
++}
++
++
++/* put_lines: append lines from the yank buffer */
++int
++put_lines (addr)
++ long addr;
++{
++ undo_t *up = NULL;
++ line_t *lp, *cp;
++
++ if ((lp = yank_buffer_head.q_forw) == &yank_buffer_head)
++ {
++ sprintf (errmsg, "Nothing to put");
++ return ERR;
++ }
++ current_addr = addr;
++ for (; lp != &yank_buffer_head; lp = lp->q_forw)
++ {
++ SPL1 ();
++ if ((cp = dup_line_node (lp)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ add_line_node (cp);
++ if (up)
++ up->t = cp;
++ else if ((up = push_undo_stack (UADD, current_addr,
++ current_addr)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ modified = 1;
++ SPL0 ();
++ }
++ return 0;
++}
++
++
++#define MAXMARK 26 /* max number of marks */
++
++line_t *mark[MAXMARK]; /* line markers */
++int markno; /* line marker count */
++
++/* mark_line_node: set a line node mark */
++int
++mark_line_node (lp, n)
++ line_t *lp;
++ int n;
++{
++ if (!islower (n))
++ {
++ sprintf (errmsg, "Invalid mark character");
++ return ERR;
++ }
++ else if (mark[n - 'a'] == NULL)
++ markno++;
++ mark[n - 'a'] = lp;
++ return 0;
++}
++
++
++/* get_marked_node_addr: return address of a marked line */
++long
++get_marked_node_addr (n)
++ int n;
++{
++ if (!islower (n))
++ {
++ sprintf (errmsg, "Invalid mark character");
++ return ERR;
++ }
++ return get_line_node_addr (mark[n - 'a']);
++}
++
++
++/* unmark_line_node: clear line node mark */
++void
++unmark_line_node (lp)
++ line_t *lp;
++{
++ int i;
++
++ for (i = 0; markno && i < MAXMARK; i++)
++ if (mark[i] == lp)
++ {
++ mark[i] = NULL;
++ markno--;
++ }
++}
++
++
++/* dup_line_node: return a pointer to a copy of a line node */
++line_t *
++dup_line_node (lp)
++ line_t *lp;
++{
++ line_t *np;
++
++ if ((np = (line_t *) malloc (sizeof (line_t))) == NULL)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Out of memory");
++ return NULL;
++ }
++ np->seek = lp->seek;
++ np->len = lp->len;
++ return np;
++}
++
++
++/* has_trailing_escape: return the parity of escapes preceding a character
++ in a string */
++int
++has_trailing_escape (s, t)
++ char *s;
++ char *t;
++{
++ return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape (s, t - 1);
++}
++
++
++/* strip_escapes: return copy of escaped string of at most length PATH_MAX */
++char *
++strip_escapes (s)
++ char *s;
++{
++ static char *file = NULL;
++ static int filesz = 0;
++
++ int i = 0;
++
++ REALLOC (file, filesz, PATH_MAX + 1, NULL);
++ /* assert: no trailing escape */
++ while ((file[i++] = (*s == '\\') ? *++s : *s))
++ s++;
++ return file;
++}
++
++
++#ifndef S_ISREG
++#define S_ISREG(m) ((m & S_IFMT) == S_IFREG)
++#endif
++
++/* is_regular_file: if file descriptor of a regular file, then return true;
++ otherwise return false */
++int
++is_regular_file (fd)
++ int fd;
++{
++ struct stat sb;
++
++ return fstat (fd, &sb) < 0 || S_ISREG (sb.st_mode);
++}
++
++
++/* is_legal_filename: return a legal filename */
++int
++is_legal_filename (s)
++ char *s;
++{
++ if (red && (*s == '!' || !strcmp (s, "..") || strchr (s, '/')))
++ {
++ sprintf (errmsg, "Shell access restricted");
++ return 0;
++ }
++ return 1;
++}
++
++FILE *sfp; /* scratch file pointer */
++off_t sfseek; /* scratch file position */
++int seek_write; /* seek before writing */
++line_t buffer_head; /* incore buffer */
++
++/* get_sbuf_line: get a line of text from the scratch file; return pointer
++ to the text */
++char *
++get_sbuf_line (lp)
++ line_t *lp;
++{
++ static char *sfbuf = NULL; /* buffer */
++ static int sfbufsz = 0; /* buffer size */
++
++ int len, ct;
++
++ if (lp == &buffer_head)
++ return NULL;
++ seek_write = 1; /* force seek on write */
++ /* out of position */
++ if (sfseek != lp->seek)
++ {
++ sfseek = lp->seek;
++ if (fseek (sfp, sfseek, SEEK_SET) < 0)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Cannot seek temp file");
++ return NULL;
++ }
++ }
++ len = lp->len;
++ REALLOC (sfbuf, sfbufsz, len + 1, NULL);
++ if ((ct = fread (sfbuf, sizeof (char), len, sfp)) < 0 || ct != len)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Cannot read temp file");
++ return NULL;
++ }
++ sfseek += len; /* update file position */
++ sfbuf[len] = '\0';
++ return sfbuf;
++}
++
++
++/* put_sbuf_line: write a line of text to the scratch file and add a line node
++ to the editor buffer; return a pointer to the end of the text */
++char *
++put_sbuf_line (cs)
++ char *cs;
++{
++ line_t *lp;
++ int len, ct;
++ char *s;
++
++ if ((lp = (line_t *) malloc (sizeof (line_t))) == NULL)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Out of memory");
++ return NULL;
++ }
++ /* assert: cs is '\n' terminated */
++ for (s = cs; *s != '\n'; s++)
++ ;
++ if (s - cs >= LINECHARS)
++ {
++ sprintf (errmsg, "Line too long");
++ return NULL;
++ }
++ len = s - cs;
++ /* out of position */
++ if (seek_write)
++ {
++ if (fseek (sfp, 0L, SEEK_END) < 0)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Cannot seek temp file");
++ return NULL;
++ }
++ sfseek = ftell (sfp);
++ seek_write = 0;
++ }
++ /* assert: SPL1() */
++ if ((ct = fwrite (cs, sizeof (char), len, sfp)) < 0 || ct != len)
++ {
++ sfseek = -1;
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Cannot write temp file");
++ return NULL;
++ }
++ lp->len = len;
++ lp->seek = sfseek;
++ add_line_node (lp);
++ sfseek += len; /* update file position */
++ return ++s;
++}
++
++
++/* add_line_node: add a line node in the editor buffer after the current line */
++void
++add_line_node (lp)
++ line_t *lp;
++{
++ line_t *cp;
++
++ cp = get_addressed_line_node (current_addr); /* this get_addressed_line_node last! */
++ INSQUE (lp, cp);
++ addr_last++;
++ current_addr++;
++}
++
++
++/* get_line_node_addr: return line number of pointer */
++long
++get_line_node_addr (lp)
++ line_t *lp;
++{
++ line_t *cp = &buffer_head;
++ long n = 0;
++
++ while (cp != lp && (cp = cp->q_forw) != &buffer_head)
++ n++;
++ if (n && cp == &buffer_head)
++ {
++ sprintf (errmsg, "Invalid address");
++ return ERR;
++ }
++ return n;
++}
++
++
++/* get_addressed_line_node: return pointer to a line node in the editor buffer */
++line_t *
++get_addressed_line_node (n)
++ long n;
++{
++ static line_t *lp = &buffer_head;
++ static long on = 0;
++
++ SPL1 ();
++ if (n > on)
++ if (n <= (on + addr_last) >> 1)
++ for (; on < n; on++)
++ lp = lp->q_forw;
++ else
++ {
++ lp = buffer_head.q_back;
++ for (on = addr_last; on > n; on--)
++ lp = lp->q_back;
++ }
++ else if (n >= on >> 1)
++ for (; on > n; on--)
++ lp = lp->q_back;
++ else
++ {
++ lp = &buffer_head;
++ for (on = 0; on < n; on++)
++ lp = lp->q_forw;
++ }
++ SPL0 ();
++ return lp;
++}
++
++
++extern int newline_added;
++
++/* open_sbuf: open scratch file */
++int
++open_sbuf ()
++{
++ char *mktemp ();
++ int u;
++
++ isbinary = newline_added = 0;
++ u = umask(077);
++ if ((sfp = tmpfile()) == NULL)
++ {
++ fprintf (stderr, "open_sbuf: tmpfile() failed with '%s'\n", strerror (errno));
++ sprintf (errmsg, "Cannot open temp file");
++ umask(u);
++ return ERR;
++ }
++ umask(u);
++ return 0;
++}
++
++
++/* close_sbuf: close scratch file */
++int
++close_sbuf ()
++{
++ if (sfp)
++ {
++ if (fclose (sfp) < 0)
++ {
++ fprintf (stderr, "close_sbuf: fclose on temporary file failed with '%s'.\n", strerror (errno));
++ sprintf (errmsg, "Cannot close temp file");
++ return ERR;
++ }
++ sfp = NULL;
++ }
++ sfseek = seek_write = 0;
++
++ return 0;
++}
++
++
++/* quit: remove_lines scratch file and exit */
++void
++quit (n)
++ int n;
++{
++ if (sfp)
++ {
++ fclose (sfp);
++ }
++ exit (n);
++}
++
++
++extern line_t yank_buffer_head;
++extern char *old_filename;
++unsigned char ctab[256]; /* character translation table */
++
++/* init_buffers: open scratch buffer; initialize line queue */
++void
++init_buffers ()
++{
++ int i = 0;
++
++ /* Read stdin one character at a time to avoid i/o contention
++ with shell escapes invoked by nonterminal input, e.g.,
++ ed - <<EOF
++ !cat
++ hello, world
++ EOF */
++#ifdef HAVE_SETBUFFER
++ setbuffer (stdin, stdinbuf, 1);
++#else
++ setvbuf (stdin, stdinbuf, _IONBF, 0);
++#endif
++ if ((errmsg = (char *) malloc (ERRSZ)) == NULL ||
++ (old_filename = (char *) malloc (PATH_MAX + 1)) == NULL)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ quit (2);
++ }
++ old_filename[0] = '\0';
++ if (open_sbuf () < 0)
++ quit (2);
++ REQUE (&buffer_head, &buffer_head);
++ REQUE (&yank_buffer_head, &yank_buffer_head);
++ for (i = 0; i < 256; i++)
++ ctab[i] = i;
++
++}
++
++
++/* translit_text: translate characters in a string */
++char *
++translit_text (s, len, from, to)
++ char *s;
++ int len;
++ int from;
++ int to;
++{
++ static int i = 0;
++
++ unsigned char *us;
++
++ ctab[i] = i; /* restore table to initial state */
++ ctab[i = from] = to;
++ for (us = (unsigned char *) s; len-- > 0; us++)
++ *us = ctab[*us];
++ return s;
++}
++
++
++#ifndef SIG_ERR
++# define SIG_ERR ((void (*)()) -1)
++#endif /* !SIG_ERR */
++
++void
++(*reliable_signal (sno, hndlr)) ()
++ int sno;
++ void (*hndlr) ();
++{
++#ifndef HAVE_SIGACTION
++ signal (sno, hndlr);
++#else
++ struct sigaction sa, osa;
++
++ sa.sa_handler = hndlr;
++ sigemptyset (&sa.sa_mask);
++ sa.sa_flags = 0;
++#ifdef SA_RESTART
++ sa.sa_flags |= SA_RESTART;
++#endif
++ return (sigaction (sno, &sa, &osa) < 0) ? SIG_ERR : osa.sa_handler;
++#endif /* HAVE_SIGACTION */
++}
++
++
++void
++signal_hup (signo)
++ int signo;
++{
++ if (mutex)
++ sigflags |= (1 << (signo - 1));
++ else
++ handle_hup (signo);
++}
++
++
++void
++signal_int (signo)
++ int signo;
++{
++ if (mutex)
++ sigflags |= (1 << (signo - 1));
++ else
++ handle_int (signo);
++}
++
++
++#ifdef HAVE_SIGSETJMP
++extern sigjmp_buf env;
++#else
++extern jmp_buf env;
++#endif
++extern int sigactive;
++
++void
++handle_hup (signo)
++ int signo;
++{
++ char *hup = NULL; /* hup filename */
++ char *s;
++ int n;
++
++ if (!sigactive)
++ quit (1);
++ sigflags &= ~(1 << (signo - 1));
++ if (addr_last && write_file ("ed.hup", "w", 1, addr_last) < 0 &&
++ (s = getenv ("HOME")) != NULL &&
++ (n = strlen (s)) + 7 <= PATH_MAX && /* "ed.hup" + '/' */
++ (hup = (char *) malloc (n + 8)) != NULL)
++ {
++ strcpy (hup, s);
++ if (n && hup[n - 1] != '/')
++ hup[n++] = '/';
++ strcpy (hup + n, "ed.hup");
++ write_file (hup, "w", 1, addr_last);
++ }
++ quit (2);
++}
++
++
++void
++handle_int (signo)
++ int signo;
++{
++ if (!sigactive)
++ quit (1);
++ sigflags &= ~(1 << (signo - 1));
++#ifdef HAVE_SIGSETJMP
++ siglongjmp (env, -1);
++#else
++ longjmp (env, -1);
++#endif
++}
++
++
++extern long rows;
++int cols = 72; /* wrap column */
++
++void
++handle_winch (signo)
++ int signo;
++{
++#ifdef TIOCGWINSZ
++ struct winsize ws; /* window size structure */
++#endif
++
++ sigflags &= ~(1 << (signo - 1));
++#ifdef TIOCGWINSZ
++ if (ioctl (0, TIOCGWINSZ, (char *) &ws) >= 0)
++ {
++ if (ws.ws_row > 2)
++ rows = ws.ws_row - 2;
++ if (ws.ws_col > 8)
++ cols = ws.ws_col - 8;
++ }
++#endif
++}
++
++/* read_file: read a named file/pipe into the buffer; return line count */
++long
++read_file (fn, n)
++ char *fn;
++ long n;
++{
++ FILE *fp;
++ long size;
++
++
++ fp = (*fn == '!') ? popen (fn + 1, "r") : fopen (strip_escapes (fn), "r");
++ if (fp == NULL)
++ {
++ fprintf (stderr, "%s: %s\n", fn, strerror (errno));
++ sprintf (errmsg, "Cannot open input file");
++ return ERR;
++ }
++ else if ((size = read_stream (fp, n)) < 0)
++ return ERR;
++ else if (((*fn == '!') ? pclose (fp) : fclose (fp)) < 0)
++ {
++ fprintf (stderr, "%s: %s\n", fn, strerror (errno));
++ sprintf (errmsg, "Cannot close input file");
++ return ERR;
++ }
++ fprintf (stderr, !scripted ? "%lu\n" : "", size);
++ return current_addr - n;
++}
++
++
++char *sbuf; /* file i/o buffer */
++int sbufsz; /* file i/o buffer size */
++int newline_added; /* if set, newline appended to input file */
++
++/* read_stream: read a stream into the editor buffer; return status */
++long
++read_stream (fp, n)
++ FILE *fp;
++ long n;
++{
++ line_t *lp = get_addressed_line_node (n);
++ undo_t *up = NULL;
++ unsigned long size = 0;
++ int o_newline_added = newline_added;
++ int o_isbinary = isbinary;
++ int o_n = n;
++ int appended = n == addr_last;
++ int len;
++
++ isbinary = newline_added = 0;
++ for (current_addr = n; (len = get_stream_line (fp)) > 0; size += len)
++ {
++ SPL1 ();
++ if (put_sbuf_line (sbuf) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ lp = lp->q_forw;
++ if (up)
++ up->t = lp;
++ else if ((up = push_undo_stack (UADD, current_addr,
++ current_addr)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ SPL0 ();
++ }
++ if (len < 0)
++ return ERR;
++ if (o_n && appended && size && o_isbinary && o_newline_added)
++ fputs ("Newline inserted\n", stderr);
++ else if (newline_added && (!appended || (!isbinary && !o_isbinary)))
++ fputs ("Newline appended\n", stderr);
++ if (isbinary && newline_added && !appended)
++ size += 1;
++ if (!size)
++ newline_added = 1;
++ newline_added = appended ? newline_added : o_newline_added;
++ isbinary = isbinary | o_isbinary;
++ return size;
++}
++
++
++/* get_stream_line: read a line of text from a stream; return line length */
++int
++get_stream_line (fp)
++ FILE *fp;
++{
++ register int c;
++ register int i = 0;
++
++ while (((c = getc (fp)) != EOF || (!feof (fp) &&
++ !ferror (fp))) && c != '\n')
++ {
++ REALLOC (sbuf, sbufsz, i + 1, ERR);
++ if (!(sbuf[i++] = c))
++ isbinary = 1;
++ }
++ REALLOC (sbuf, sbufsz, i + 2, ERR);
++ if (c == '\n')
++ sbuf[i++] = c;
++ else if (ferror (fp))
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Cannot read input file");
++ return ERR;
++ }
++ else if (i)
++ {
++ sbuf[i++] = '\n';
++ newline_added = 1;
++ }
++ sbuf[i] = '\0';
++ return (isbinary && newline_added && i) ? --i : i;
++}
++
++
++/* write_file: write a range of lines to a named file/pipe; return line count */
++long
++write_file (fn, mode, n, m)
++ char *fn;
++ char *mode;
++ long n;
++ long m;
++{
++ FILE *fp;
++ long size;
++
++ fp = (*fn == '!') ? popen (fn + 1, "w") : fopen (strip_escapes (fn), mode);
++ if (fp == NULL)
++ {
++ fprintf (stderr, "%s: %s\n", fn, strerror (errno));
++ sprintf (errmsg, "Cannot open output file");
++ return ERR;
++ }
++ else if ((size = write_stream (fp, n, m)) < 0)
++ return ERR;
++ else if (((*fn == '!') ? pclose (fp) : fclose (fp)) < 0)
++ {
++ fprintf (stderr, "%s: %s\n", fn, strerror (errno));
++ sprintf (errmsg, "Cannot close output file");
++ return ERR;
++ }
++ fprintf (stderr, !scripted ? "%lu\n" : "", size);
++ return n ? m - n + 1 : 0;
++}
++
++
++/* write_stream: write a range of lines to a stream; return status */
++long
++write_stream (fp, n, m)
++ FILE *fp;
++ long n;
++ long m;
++{
++ line_t *lp = get_addressed_line_node (n);
++ unsigned long size = 0;
++ char *s;
++ int len;
++
++ for (; n && n <= m; n++, lp = lp->q_forw)
++ {
++ if ((s = get_sbuf_line (lp)) == NULL)
++ return ERR;
++ len = lp->len;
++ if (n != addr_last || !isbinary || !newline_added)
++ s[len++] = '\n';
++ if (put_stream_line (fp, s, len) < 0)
++ return ERR;
++ size += len;
++ }
++ return size;
++}
++
++
++/* put_stream_line: write a line of text to a stream; return status */
++int
++put_stream_line (fp, s, len)
++ FILE *fp;
++ char *s;
++ int len;
++{
++ while (len--)
++ if (fputc (*s++, fp) < 0)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Cannot write file");
++ return ERR;
++ }
++ return 0;
++}
++
++/* get_extended_line: get an extended line from stdin */
++char *
++get_extended_line (sizep, nonl)
++ int *sizep;
++ int nonl;
++{
++ static char *cvbuf = NULL; /* buffer */
++ static int cvbufsz = 0; /* buffer size */
++
++ int l, n;
++ char *t = ibufp;
++
++ while (*t++ != '\n')
++ ;
++ if ((l = t - ibufp) < 2 || !has_trailing_escape (ibufp, ibufp + l - 1))
++ {
++ *sizep = l;
++ return ibufp;
++ }
++ *sizep = -1;
++ REALLOC (cvbuf, cvbufsz, l, NULL);
++ memcpy (cvbuf, ibufp, l);
++ *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
++ if (nonl)
++ l--; /* strip newline */
++ for (;;)
++ {
++ if ((n = get_tty_line ()) < 0)
++ return NULL;
++ else if (n == 0 || ibuf[n - 1] != '\n')
++ {
++ sprintf (errmsg, "Unexpected end-of-file");
++ return NULL;
++ }
++ REALLOC (cvbuf, cvbufsz, l + n, NULL);
++ memcpy (cvbuf + l, ibuf, n);
++ l += n;
++ if (n < 2 || !has_trailing_escape (cvbuf, cvbuf + l - 1))
++ break;
++ *(cvbuf + --l - 1) = '\n'; /* strip trailing esc */
++ if (nonl)
++ l--; /* strip newline */
++ }
++ REALLOC (cvbuf, cvbufsz, l + 1, NULL);
++ cvbuf[l] = '\0';
++ *sizep = l;
++ return cvbuf;
++}
++
++
++/* get_tty_line: read a line of text from stdin; return line length */
++int
++get_tty_line ()
++{
++ register int oi = 0;
++ register int i = 0;
++ int c;
++
++ /* Read stdin one character at a time to avoid i/o contention
++ with shell escapes invoked by nonterminal input, e.g.,
++ ed - <<EOF
++ !cat
++ hello, world
++ EOF */
++ for (;;)
++ switch (c = getchar ())
++ {
++ default:
++ oi = 0;
++ REALLOC (ibuf, ibufsz, i + 2, ERR);
++ if (!(ibuf[i++] = c))
++ isbinary = 1;
++ if (c != '\n')
++ continue;
++ lineno++;
++ ibuf[i] = '\0';
++ ibufp = ibuf;
++ return i;
++ case EOF:
++ if (ferror (stdin))
++ {
++ fprintf (stderr, "stdin: %s\n", strerror (errno));
++ sprintf (errmsg, "Cannot read stdin");
++ clearerr (stdin);
++ ibufp = NULL;
++ return ERR;
++ }
++ else
++ {
++ clearerr (stdin);
++ if (i != oi)
++ {
++ oi = i;
++ continue;
++ }
++ else if (i)
++ ibuf[i] = '\0';
++ ibufp = ibuf;
++ return i;
++ }
++ }
++}
++
++
++
++#define ESCAPES "\a\b\f\n\r\t\v\\"
++#define ESCCHARS "abfnrtv\\"
++
++extern long rows;
++extern int cols;
++extern int dlcnt;
++
++/* put_tty_line: print text to stdout */
++int
++put_tty_line (s, l, n, gflag)
++ char *s;
++ int l;
++ long n;
++ int gflag;
++{
++ int col = 0;
++ char *cp;
++
++ if (gflag & GNP)
++ {
++ printf ("%ld\t", n);
++ col = 8;
++ }
++ for (; l--; s++)
++ {
++ if ((gflag & GLS) && ++col > cols)
++ {
++ fputs ("\\\n", stdout);
++ col = 1;
++ if (!traditional && !scripted && !isglobal && ++dlcnt > rows)
++ {
++ dlcnt = 0;
++ fputs ("Press <RETURN> to continue... ", stdout);
++ fflush (stdout);
++ if (get_tty_line () < 0)
++ return ERR;
++ }
++ }
++ if (gflag & GLS)
++ {
++ if (31 < *s && *s < 127 && *s != '\\')
++ putchar (*s);
++ else
++ {
++ putchar ('\\');
++ col++;
++ if (*s && (cp = strchr (ESCAPES, *s)) != NULL)
++ putchar (ESCCHARS[cp - ESCAPES]);
++ else
++ {
++ putchar ((((unsigned char) *s & 0300) >> 6) + '0');
++ putchar ((((unsigned char) *s & 070) >> 3) + '0');
++ putchar (((unsigned char) *s & 07) + '0');
++ col += 2;
++ }
++ }
++
++ }
++ else
++ putchar (*s);
++ }
++ if (!traditional && (gflag & GLS))
++ putchar ('$');
++ putchar ('\n');
++ return 0;
++}
++
++
++
++
++char *rhbuf; /* rhs substitution buffer */
++int rhbufsz; /* rhs substitution buffer size */
++int rhbufi; /* rhs substitution buffer index */
++
++/* extract_subst_tail: extract substitution tail from the command buffer */
++int
++extract_subst_tail (flagp, np)
++ int *flagp;
++ int *np;
++{
++ char delimiter;
++
++ *flagp = *np = 0;
++ if ((delimiter = *ibufp) == '\n')
++ {
++ rhbufi = 0;
++ *flagp = GPR;
++ return 0;
++ }
++ else if (extract_subst_template () == NULL)
++ return ERR;
++ else if (*ibufp == '\n')
++ {
++ *flagp = GPR;
++ return 0;
++ }
++ else if (*ibufp == delimiter)
++ ibufp++;
++ if ('1' <= *ibufp && *ibufp <= '9')
++ {
++ STRTOL (*np, ibufp);
++ return 0;
++ }
++ else if (*ibufp == 'g')
++ {
++ ibufp++;
++ *flagp = GSG;
++ return 0;
++ }
++ return 0;
++}
++
++
++/* extract_subst_template: return pointer to copy of substitution template
++ in the command buffer */
++char *
++extract_subst_template ()
++{
++ int n = 0;
++ int i = 0;
++ char c;
++ char delimiter = *ibufp++;
++
++ if (*ibufp == '%' && *(ibufp + 1) == delimiter)
++ {
++ ibufp++;
++ if (!rhbuf)
++ sprintf (errmsg, "No previous substitution");
++ return rhbuf;
++ }
++ while (*ibufp != delimiter)
++ {
++ REALLOC (rhbuf, rhbufsz, i + 2, NULL);
++ if ((c = rhbuf[i++] = *ibufp++) == '\n' && *ibufp == '\0')
++ {
++ i--, ibufp--;
++ break;
++ }
++ else if (c != '\\')
++ ;
++ else if ((rhbuf[i++] = *ibufp++) != '\n')
++ ;
++ else if (!isglobal)
++ {
++ while ((n = get_tty_line ()) == 0 ||
++ (n > 0 && ibuf[n - 1] != '\n'))
++ clearerr (stdin);
++ if (n < 0)
++ return NULL;
++ }
++ }
++ REALLOC (rhbuf, rhbufsz, i + 1, NULL);
++ rhbuf[rhbufi = i] = '\0';
++ return rhbuf;
++}
++
++
++char *rbuf; /* substitute_matching_text buffer */
++int rbufsz; /* substitute_matching_text buffer size */
++
++/* search_and_replace: for each line in a range, change text matching a pattern
++ according to a substitution template; return status */
++int
++search_and_replace (pat, gflag, kth)
++ pattern_t *pat;
++ int gflag;
++ int kth;
++{
++ undo_t *up;
++ char *txt;
++ char *eot;
++ long lc;
++ int nsubs = 0;
++ line_t *lp;
++ int len;
++
++ current_addr = first_addr - 1;
++ for (lc = 0; lc <= second_addr - first_addr; lc++)
++ {
++ lp = get_addressed_line_node (++current_addr);
++ if ((len = substitute_matching_text (pat, lp, gflag, kth)) < 0)
++ return ERR;
++ else if (len)
++ {
++ up = NULL;
++ if (delete_lines (current_addr, current_addr) < 0)
++ return ERR;
++ txt = rbuf;
++ eot = rbuf + len;
++ SPL1 ();
++ do
++ {
++ if ((txt = put_sbuf_line (txt)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ else if (up)
++ up->t = get_addressed_line_node (current_addr);
++ else if ((up = push_undo_stack (UADD,
++ current_addr, current_addr)) == NULL)
++ {
++ SPL0 ();
++ return ERR;
++ }
++ }
++ while (txt != eot);
++ SPL0 ();
++ nsubs++;
++ }
++ }
++ if (nsubs == 0 && !(gflag & GLB))
++ {
++ sprintf (errmsg, "No match");
++ return ERR;
++ }
++ else if ((gflag & (GPR | GLS | GNP)) &&
++ display_lines (current_addr, current_addr, gflag) < 0)
++ return ERR;
++ return 0;
++}
++
++
++/* substitute_matching_text: replace text matched by a pattern according to
++ a substitution template; return pointer to the modified text */
++int
++substitute_matching_text (pat, lp, gflag, kth)
++ pattern_t *pat;
++ line_t *lp;
++ int gflag;
++ int kth;
++{
++ int off = 0;
++ int changed = 0;
++ int matchno = 0;
++ int i = 0;
++ regmatch_t rm[SE_MAX];
++ char *txt;
++ char *eot;
++
++ if ((txt = get_sbuf_line (lp)) == NULL)
++ return ERR;
++ if (isbinary)
++ NUL_TO_NEWLINE (txt, lp->len);
++ eot = txt + lp->len;
++ if (!regexec (pat, txt, SE_MAX, rm, 0))
++ {
++ do
++ {
++ if (!kth || kth == ++matchno)
++ {
++ changed++;
++ i = rm[0].rm_so;
++ REALLOC (rbuf, rbufsz, off + i, ERR);
++ if (isbinary)
++ NEWLINE_TO_NUL (txt, rm[0].rm_eo);
++ memcpy (rbuf + off, txt, i);
++ off += i;
++ if ((off = apply_subst_template (txt, rm, off,
++ pat->re_nsub)) < 0)
++ return ERR;
++ }
++ else
++ {
++ i = rm[0].rm_eo;
++ REALLOC (rbuf, rbufsz, off + i, ERR);
++ if (isbinary)
++ NEWLINE_TO_NUL (txt, i);
++ memcpy (rbuf + off, txt, i);
++ off += i;
++ }
++ txt += rm[0].rm_eo;
++ }
++ while (*txt && (!changed || ((gflag & GSG) && rm[0].rm_eo)) &&
++ !regexec (pat, txt, SE_MAX, rm, REG_NOTBOL));
++ i = eot - txt;
++ REALLOC (rbuf, rbufsz, off + i + 2, ERR);
++ if (i > 0 && !rm[0].rm_eo && (gflag & GSG))
++ {
++ sprintf (errmsg, "Infinite substitution loop");
++ return ERR;
++ }
++ if (isbinary)
++ NEWLINE_TO_NUL (txt, i);
++ memcpy (rbuf + off, txt, i);
++ memcpy (rbuf + off + i, "\n", 2);
++ }
++ return changed ? off + i + 1 : 0;
++}
++
++
++/* apply_subst_template: modify text according to a substitution template;
++ return offset to end of modified text */
++int
++apply_subst_template (boln, rm, off, re_nsub)
++ char *boln;
++ regmatch_t *rm;
++ int off;
++ int re_nsub;
++{
++ int j = 0;
++ int k = 0;
++ int n;
++ char *sub = rhbuf;
++
++ for (; sub - rhbuf < rhbufi; sub++)
++ if (*sub == '&')
++ {
++ j = rm[0].rm_so;
++ k = rm[0].rm_eo;
++ REALLOC (rbuf, rbufsz, off + k - j, ERR);
++ while (j < k)
++ rbuf[off++] = boln[j++];
++ }
++ else if (*sub == '\\' && '1' <= *++sub && *sub <= '9' &&
++ (n = *sub - '0') <= re_nsub)
++ {
++ j = rm[n].rm_so;
++ k = rm[n].rm_eo;
++ REALLOC (rbuf, rbufsz, off + k - j, ERR);
++ while (j < k)
++ rbuf[off++] = boln[j++];
++ }
++ else
++ {
++ REALLOC (rbuf, rbufsz, off + 1, ERR);
++ rbuf[off++] = *sub;
++ }
++ REALLOC (rbuf, rbufsz, off + 1, ERR);
++ rbuf[off] = '\0';
++ return off;
++}
++
++
++
++#define USIZE 100 /* undo stack size */
++undo_t *ustack = NULL; /* undo stack */
++long usize = 0; /* stack size variable */
++long u_p = 0; /* undo stack pointer */
++
++/* push_undo_stack: return pointer to intialized undo node */
++undo_t *
++push_undo_stack (type, from, to)
++ int type;
++ long from;
++ long to;
++{
++ undo_t *t;
++
++ if ((t = ustack) == NULL &&
++ (t = ustack = (undo_t *) malloc ((usize = USIZE) * sizeof (undo_t))) == NULL)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Out of memory");
++ return NULL;
++ }
++ else if (u_p >= usize &&
++ (t = (undo_t *) realloc (ustack, (usize += USIZE) * sizeof (undo_t))) == NULL)
++ {
++ /* out of memory - release undo stack */
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Out of memory");
++ clear_undo_stack ();
++ free (ustack);
++ ustack = NULL;
++ usize = 0;
++ return NULL;
++ }
++ ustack = t;
++ ustack[u_p].type = type;
++ ustack[u_p].t = get_addressed_line_node (to);
++ ustack[u_p].h = get_addressed_line_node (from);
++ return ustack + u_p++;
++}
++
++
++/* USWAP: swap undo nodes */
++#define USWAP(x, y) \
++ do \
++ { \
++ undo_t utmp; \
++ utmp = (x), (x) = (y), (y) = utmp; \
++ } \
++ while (0)
++
++
++long u_current_addr = -1; /* if >= 0, undo enabled */
++long u_addr_last = -1; /* if >= 0, undo enabled */
++
++/* pop_undo_stack: undo last change to the editor buffer */
++int
++pop_undo_stack ()
++{
++ long n;
++ long o_current_addr = current_addr;
++ long o_addr_last = addr_last;
++
++ if (u_current_addr == -1 || u_addr_last == -1)
++ {
++ sprintf (errmsg, "Nothing to undo");
++ return ERR;
++ }
++ else if (u_p)
++ modified = 1;
++ get_addressed_line_node (0); /* this get_addressed_line_node last! */
++ SPL1 ();
++ for (n = u_p; n-- > 0;)
++ {
++ switch (ustack[n].type)
++ {
++ case UADD:
++ REQUE (ustack[n].h->q_back, ustack[n].t->q_forw);
++ break;
++ case UDEL:
++ REQUE (ustack[n].h->q_back, ustack[n].h);
++ REQUE (ustack[n].t, ustack[n].t->q_forw);
++ break;
++ case UMOV:
++ case VMOV:
++ REQUE (ustack[n - 1].h, ustack[n].h->q_forw);
++ REQUE (ustack[n].t->q_back, ustack[n - 1].t);
++ REQUE (ustack[n].h, ustack[n].t);
++ n--;
++ break;
++ default:
++ /*NOTREACHED */
++ ;
++ }
++ ustack[n].type ^= 1;
++ }
++ /* reverse undo stack order */
++ for (n = u_p; n-- > (u_p + 1) / 2;)
++ USWAP (ustack[n], ustack[u_p - 1 - n]);
++ if (isglobal)
++ clear_active_list ();
++ current_addr = u_current_addr, u_current_addr = o_current_addr;
++ addr_last = u_addr_last, u_addr_last = o_addr_last;
++ SPL0 ();
++ return 0;
++}
++
++
++/* clear_undo_stack: clear the undo stack */
++void
++clear_undo_stack ()
++{
++ line_t *lp, *ep, *tl;
++
++ while (u_p--)
++ if (ustack[u_p].type == UDEL)
++ {
++ ep = ustack[u_p].t->q_forw;
++ for (lp = ustack[u_p].h; lp != ep; lp = tl)
++ {
++ unmark_line_node (lp);
++ tl = lp->q_forw;
++ free (lp);
++ }
++ }
++ u_p = 0;
++ u_current_addr = current_addr;
++ u_addr_last = addr_last;
++}
++
++
++
++
++/* build_active_list: add line matching a pattern to the global-active list */
++int
++build_active_list (isgcmd)
++ int isgcmd;
++{
++ pattern_t *pat;
++ line_t *lp;
++ long n;
++ char *s;
++ char delimiter;
++
++ if ((delimiter = *ibufp) == ' ' || delimiter == '\n')
++ {
++ sprintf (errmsg, "Invalid pattern delimiter");
++ return ERR;
++ }
++ else if ((pat = get_compiled_pattern ()) == NULL)
++ return ERR;
++ else if (*ibufp == delimiter)
++ ibufp++;
++ clear_active_list ();
++ lp = get_addressed_line_node (first_addr);
++ for (n = first_addr; n <= second_addr; n++, lp = lp->q_forw)
++ {
++ if ((s = get_sbuf_line (lp)) == NULL)
++ return ERR;
++ if (isbinary)
++ NUL_TO_NEWLINE (s, lp->len);
++ if (!regexec (pat, s, 0, NULL, 0) == isgcmd &&
++ set_active_node (lp) < 0)
++ return ERR;
++ }
++ return 0;
++}
++
++
++/* exec_global: apply command list in the command buffer to the active
++ lines in a range; return command status */
++long
++exec_global (interact, gflag)
++ int interact;
++ int gflag;
++{
++ static char *ocmd = NULL;
++ static int ocmdsz = 0;
++
++ line_t *lp = NULL;
++ int status;
++ int n;
++ char *cmd = NULL;
++
++ if (!interact)
++ if (traditional && !strcmp (ibufp, "\n"))
++ cmd = "p\n"; /* null cmd-list == `p' */
++ else if ((cmd = get_extended_line (&n, 0)) == NULL)
++ return ERR;
++ clear_undo_stack ();
++ while ((lp = next_active_node ()) != NULL)
++ {
++ if ((current_addr = get_line_node_addr (lp)) < 0)
++ return ERR;
++ if (interact)
++ {
++ /* print current_addr; get a command in global syntax */
++ if (display_lines (current_addr, current_addr, gflag) < 0)
++ return ERR;
++ while ((n = get_tty_line ()) > 0 &&
++ ibuf[n - 1] != '\n')
++ clearerr (stdin);
++ if (n < 0)
++ return ERR;
++ else if (n == 0)
++ {
++ sprintf (errmsg, "Unexpected end-of-file");
++ return ERR;
++ }
++ else if (n == 1 && !strcmp (ibuf, "\n"))
++ continue;
++ else if (n == 2 && !strcmp (ibuf, "&\n"))
++ {
++ if (cmd == NULL)
++ {
++ sprintf (errmsg, "No previous command");
++ return ERR;
++ }
++ else
++ cmd = ocmd;
++ }
++ else if ((cmd = get_extended_line (&n, 0)) == NULL)
++ return ERR;
++ else
++ {
++ REALLOC (ocmd, ocmdsz, n + 1, ERR);
++ memcpy (ocmd, cmd, n + 1);
++ cmd = ocmd;
++ }
++
++ }
++ ibufp = cmd;
++ for (; *ibufp;)
++ if ((status = extract_addr_range ()) < 0 ||
++ (status = exec_command ()) < 0 ||
++ (status > 0 && (status = display_lines (
++ current_addr, current_addr, status)) < 0))
++ return status;
++ }
++ return 0;
++}
++
++
++line_t **active_list; /* list of lines active in a global command */
++long active_last; /* index of last active line in active_list */
++long active_size; /* size of active_list */
++long active_ptr; /* active_list index (non-decreasing) */
++long active_ndx; /* active_list index (modulo active_last) */
++
++/* set_active_node: add a line node to the global-active list */
++int
++set_active_node (lp)
++ line_t *lp;
++{
++ if (active_last + 1 > active_size)
++ {
++ int ti = active_size;
++ line_t **ts;
++ SPL1 ();
++ if (active_list != NULL)
++ {
++ if ((ts = (line_t **) realloc (active_list,
++ (ti += MINBUFSZ) * sizeof (line_t **))) == NULL)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Out of memory");
++ SPL0 ();
++ return ERR;
++ }
++ }
++ else
++ {
++ if ((ts = (line_t **) malloc ((ti += MINBUFSZ) *
++ sizeof (line_t **))) == NULL)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Out of memory");
++ SPL0 ();
++ return ERR;
++ }
++ }
++ active_size = ti;
++ active_list = ts;
++ SPL0 ();
++ }
++ active_list[active_last++] = lp;
++ return 0;
++}
++
++
++/* unset_active_nodes: remove a range of lines from the global-active list */
++void
++unset_active_nodes (np, mp)
++ line_t *np, *mp;
++{
++ line_t *lp;
++ long i;
++
++ for (lp = np; lp != mp; lp = lp->q_forw)
++ for (i = 0; i < active_last; i++)
++ if (active_list[active_ndx] == lp)
++ {
++ active_list[active_ndx] = NULL;
++ active_ndx = INC_MOD (active_ndx, active_last - 1);
++ break;
++ }
++ else
++ active_ndx = INC_MOD (active_ndx, active_last - 1);
++}
++
++
++/* next_active_node: return the next global-active line node */
++line_t *
++next_active_node ()
++{
++ while (active_ptr < active_last && active_list[active_ptr] == NULL)
++ active_ptr++;
++ return (active_ptr < active_last) ? active_list[active_ptr++] : NULL;
++}
++
++
++/* clear_active_list: clear the global-active list */
++void
++clear_active_list ()
++{
++ SPL1 ();
++ active_size = active_last = active_ptr = active_ndx = 0;
++ if (active_list != NULL)
++ free (active_list);
++ active_list = NULL;
++ SPL0 ();
++}
++
++
++
++/* get_compiled_pattern: return pointer to compiled pattern from command
++ buffer */
++pattern_t *
++get_compiled_pattern ()
++{
++ static pattern_t *exp = NULL;
++
++ char *exps;
++ char delimiter;
++ int n;
++
++ if ((delimiter = *ibufp) == ' ')
++ {
++ sprintf (errmsg, "Invalid pattern delimiter");
++ return NULL;
++ }
++ else if (delimiter == '\n' || *++ibufp == '\n' || *ibufp == delimiter)
++ {
++ if (!exp)
++ sprintf (errmsg, "No previous pattern");
++ return exp;
++ }
++ else if ((exps = extract_pattern (delimiter)) == NULL)
++ return NULL;
++ /* buffer alloc'd && not reserved */
++ if (exp && !patlock)
++ regfree (exp);
++ else if ((exp = (pattern_t *) malloc (sizeof (pattern_t))) == NULL)
++ {
++ fprintf (stderr, "%s\n", strerror (errno));
++ sprintf (errmsg, "Out of memory");
++ return NULL;
++ }
++ patlock = 0;
++ if ((n = regcomp (exp, exps, 0)))
++ {
++ regerror (n, exp, errmsg, ERRSZ);
++ free (exp);
++ return exp = NULL;
++ }
++ return exp;
++}
++
++
++/* extract_pattern: copy a pattern string from the command buffer; return
++ pointer to the copy */
++char *
++extract_pattern (delimiter)
++ int delimiter;
++{
++ static char *lhbuf = NULL; /* buffer */
++ static int lhbufsz = 0; /* buffer size */
++
++ char *nd;
++ int len;
++
++ for (nd = ibufp; *nd != delimiter && *nd != '\n'; nd++)
++ switch (*nd)
++ {
++ default:
++ break;
++ case '[':
++ if ((nd = parse_char_class (++nd)) == NULL)
++ {
++ sprintf (errmsg, "Unbalanced brackets ([])");
++ return NULL;
++ }
++ break;
++ case '\\':
++ if (*++nd == '\n')
++ {
++ sprintf (errmsg, "Trailing backslash (\\)");
++ return NULL;
++ }
++ break;
++ }
++ len = nd - ibufp;
++ REALLOC (lhbuf, lhbufsz, len + 1, NULL);
++ memcpy (lhbuf, ibufp, len);
++ lhbuf[len] = '\0';
++ ibufp = nd;
++ return (isbinary) ? NUL_TO_NEWLINE (lhbuf, len) : lhbuf;
++}
++
++
++/* parse_char_class: expand a POSIX character class */
++char *
++parse_char_class (s)
++ char *s;
++{
++ int c, d;
++
++ if (*s == '^')
++ s++;
++ if (*s == ']')
++ s++;
++ for (; *s != ']' && *s != '\n'; s++)
++ if (*s == '[' && ((d = *(s + 1)) == '.' || d == ':' || d == '='))
++ for (s++, c = *++s; *s != ']' || c != d; s++)
++ if ((c = *s) == '\n')
++ return NULL;
++ return (*s == ']') ? s : NULL;
++}
+--- /dev/null 2005-04-22 11:15:01.120978184 -0400
++++ editors/ed.h 2005-04-22 11:15:09.000000000 -0400
+@@ -0,0 +1,256 @@
++/* ed.h: type and constant definitions for the ed editor. */
++/* ed line editor.
++ Copyright (C) 1993, 1994 Andrew Moore, Talke Studio
++ All Rights Reserved
++
++ This program is free software; you can redistribute it and/or modify
++ it under the terms of the GNU General Public License as published by
++ the Free Software Foundation; either version 2, or (at your option)
++ any later version.
++
++ This program is distributed in the hope that it will be useful, but
++ WITHOUT ANY WARRANTY; without even the implied warranty of
++ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
++ General Public License for more details.
++
++ You should have received a copy of the GNU General Public License
++ along with this program; if not, write to the Free Software
++ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
++
++ @(#)$Id: ed.h,v 1.14 1994/11/13 04:25:44 alm Exp $
++*/
++
++#include <stdio.h>
++
++#define ERR (-2)
++#define EMOD (-3)
++#define FATAL (-4)
++
++#define ERRSZ (PATH_MAX + 40) /* size of error message buffer */
++#define MINBUFSZ 512 /* minimum buffer size: must be > 0 */
++#define SE_MAX 30 /* max subexpressions in a regular expression */
++
++#define LINECHARS INT_MAX /* max chars per line */
++
++/* gflags */
++#define GLB 001 /* global command */
++#define GPR 002 /* print after command */
++#define GLS 004 /* list after command */
++#define GNP 010 /* enumerate after command */
++#define GSG 020 /* global substitute */
++
++typedef regex_t pattern_t;
++
++/* Line node */
++typedef struct line
++ {
++ struct line *q_forw;
++ struct line *q_back;
++ off_t seek; /* address of line in scratch buffer */
++ int len; /* length of line */
++ }
++line_t;
++
++
++typedef struct undo
++ {
++
++/* type of undo nodes */
++#define UADD 0
++#define UDEL 1
++#define UMOV 2
++#define VMOV 3
++
++ int type; /* command type */
++ line_t *h; /* head of list */
++ line_t *t; /* tail of list */
++ }
++undo_t;
++
++#define INC_MOD(l, k) ((l) + 1 > (k) ? 0 : (l) + 1)
++#define DEC_MOD(l, k) ((l) - 1 < 0 ? (k) : (l) - 1)
++
++/* SPL1: disable some interrupts (requires reliable signals) */
++#define SPL1() mutex++
++
++/* SPL0: enable all interrupts; check sigflags (requires reliable signals) */
++#define SPL0() \
++ do \
++ { \
++ if (--mutex == 0) \
++ { \
++ if (sigflags & (1 << (SIGHUP - 1))) handle_hup (SIGHUP); \
++ if (sigflags & (1 << (SIGINT - 1))) handle_int (SIGINT); \
++ } \
++ } \
++ while (0)
++
++/* STRTOL: convert a string to long */
++#define STRTOL(i, p) \
++ do \
++ { \
++ if ((((i) = strtol ((p), &(p), 10)) == LONG_MIN \
++ || (i) == LONG_MAX) && errno == ERANGE) \
++ { \
++ sprintf (errmsg, "Number out of range"); \
++ (i) = 0; \
++ return ERR; \
++ } \
++ } \
++ while (0)
++
++/* REALLOC: assure at least a minimum size for buffer b */
++#define REALLOC(b, n, i, err) \
++ do \
++ { \
++ if ((i) > (n)) \
++ { \
++ int ti = (n); \
++ char *ts; \
++ SPL1 (); \
++ if ((b) != NULL) \
++ { \
++ if ((ts = (char *) realloc ((b), ti += max ((i), MINBUFSZ))) \
++ == NULL) \
++ { \
++ fprintf (stderr, "%s\n", strerror (errno)); \
++ sprintf (errmsg, "Out of memory"); \
++ SPL0 (); \
++ return err; \
++ } \
++ } \
++ else \
++ { \
++ if ((ts = (char *) malloc (ti += max ((i), MINBUFSZ))) \
++ == NULL) \
++ { \
++ fprintf (stderr, "%s\n", strerror (errno)); \
++ sprintf (errmsg, "Out of memory"); \
++ SPL0 (); \
++ return err; \
++ } \
++ } \
++ (n) = ti; \
++ (b) = ts; \
++ SPL0 (); \
++ } \
++ } \
++ while (0)
++
++/* REQUE: link pred before succ */
++#define REQUE(pred, succ) \
++ ((pred)->q_forw = (succ), (succ)->q_back = (pred))
++
++/* INSQUE: insert elem in circular queue after pred */
++#define INSQUE(elem, pred) \
++ do \
++ { \
++ REQUE ((elem), (pred)->q_forw); \
++ REQUE ((pred), (elem)); \
++ } \
++ while (0)
++
++/* REMQUE: remove elem from circular queue */
++#define REMQUE(elem) \
++ REQUE ((elem)->q_back, (elem)->q_forw)
++
++/* NUL_TO_NEWLINE: overwrite ASCII NULs with newlines */
++#define NUL_TO_NEWLINE(s, l) translit_text(s, l, '\0', '\n')
++
++/* NEWLINE_TO_NUL: overwrite newlines with ASCII NULs */
++#define NEWLINE_TO_NUL(s, l) translit_text(s, l, '\n', '\0')
++
++/* Local Function Declarations */
++void add_line_node __P ((line_t *));
++int append_lines __P ((long));
++int apply_subst_template __P ((char *, regmatch_t *, int, int));
++int build_active_list __P ((int));
++int cbc_decode __P ((char *, FILE *));
++int cbc_encode __P ((char *, int, FILE *));
++int check_addr_range __P ((long, long));
++void clear_active_list __P ((void));
++void clear_undo_stack __P ((void));
++int close_sbuf __P ((void));
++int copy_lines __P ((long));
++int delete_lines __P ((long, long));
++void delete_yank_lines __P ((void));
++int display_lines __P ((long, long, int));
++line_t *dup_line_node __P ((line_t *));
++int exec_command __P ((void));
++long exec_global __P ((int, int));
++int extract_addr_range __P ((void));
++char *extract_pattern __P ((int));
++int extract_subst_tail __P ((int *, int *));
++char *extract_subst_template __P ((void));
++int filter_lines __P ((long, long, char *));
++line_t *get_addressed_line_node __P ((long));
++pattern_t *get_compiled_pattern __P ((void));
++char *get_extended_line __P ((int *, int));
++char *get_filename __P ((void));
++int get_keyword __P ((void));
++long get_line_node_addr __P ((line_t *));
++long get_matching_node_addr __P ((pattern_t *, int));
++long get_marked_node_addr __P ((int));
++char *get_sbuf_line __P ((line_t *));
++int get_shell_command __P ((void));
++int get_stream_line __P ((FILE *));
++int get_tty_line __P ((void));
++void handle_hup __P ((int));
++void handle_int __P ((int));
++void handle_winch __P ((int));
++int has_trailing_escape __P ((char *, char *));
++int hex_to_binary __P ((int, int));
++void init_buffers __P ((void));
++int is_legal_filename __P ((char *));
++int is_regular_file __P ((int));
++int join_lines __P ((long, long));
++int mark_line_node __P ((line_t *, int));
++int move_lines __P ((long));
++line_t *next_active_node ();
++long next_addr __P ((void));
++int open_sbuf __P ((void));
++char *parse_char_class __P ((char *));
++int pop_undo_stack __P ((void));
++undo_t *push_undo_stack __P ((int, long, long));
++int put_lines __P ((long));
++char *put_sbuf_line __P ((char *));
++int put_stream_line __P ((FILE *, char *, int));
++int put_tty_line __P ((char *, int, long, int));
++void quit __P ((int));
++long read_file __P ((char *, long));
++long read_stream __P ((FILE *, long));
++void (*reliable_signal __P ((int, void (*) ()))) ();
++int search_and_replace __P ((pattern_t *, int, int));
++int set_active_node __P ((line_t *));
++void signal_hup __P ((int));
++void signal_int __P ((int));
++char *strip_escapes __P ((char *));
++int substitute_matching_text __P ((pattern_t *, line_t *, int, int));
++char *translit_text __P ((char *, int, int, int));
++void unmark_line_node __P ((line_t *));
++void unset_active_nodes __P ((line_t *, line_t *));
++long write_file __P ((char *, char *, long, long));
++long write_stream __P ((FILE *, long, long));
++int yank_lines __P ((long, long));
++
++/* global buffers */
++extern char stdinbuf[];
++extern char *errmsg;
++extern char *ibuf;
++extern char *ibufp;
++extern int ibufsz;
++
++/* global flags */
++extern int isbinary;
++extern int isglobal;
++extern int modified;
++extern int mutex;
++extern int sigflags;
++extern int traditional;
++
++/* global vars */
++extern long addr_last;
++extern long current_addr;
++extern long first_addr;
++extern int lineno;
++extern long second_addr;
projects / platform / upstream / busybox.git / commitdiff