1 /* vi: set sw=4 ts=4: */
3 * Minix shell port for busybox
5 * This version of the Minix shell was adapted for use in busybox
6 * by Erik Andersen <andersen@codepoet.org>
8 * - backtick expansion did not work properly
9 * Jonas Holmberg <jonas.holmberg@axis.com>
10 * Robert Schwebel <r.schwebel@pengutronix.de>
11 * Erik Andersen <andersen@codepoet.org>
13 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
16 #include <sys/times.h>
23 # include <sys/types.h>
24 # include <sys/stat.h>
25 # include <sys/wait.h>
36 # define bb_dev_null "/dev/null"
37 # define DEFAULT_SHELL "/proc/self/exe"
38 # define CONFIG_BUSYBOX_EXEC_PATH "/proc/self/exe"
39 # define bb_banner "busybox standalone"
40 # define ENABLE_FEATURE_SH_STANDALONE 0
41 # define bb_msg_memory_exhausted "memory exhausted"
42 # define xmalloc(size) malloc(size)
43 # define msh_main(argc,argv) main(argc,argv)
44 # define safe_read(fd,buf,count) read(fd,buf,count)
45 # define NOT_LONE_DASH(s) ((s)[0] != '-' || (s)[1])
46 # define LONE_CHAR(s,c) ((s)[0] == (c) && !(s)[1])
47 # define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
48 static int find_applet_by_name(const char *applet)
52 static char *utoa_to_buf(unsigned n, char *buf, unsigned buflen)
55 assert(sizeof(unsigned) == 4);
58 for (i = 1000000000; i; i /= 10) {
60 if (res || out || i == 1) {
70 static char *itoa_to_buf(int n, char *buf, unsigned buflen)
72 if (buflen && n < 0) {
77 return utoa_to_buf((unsigned)n, buf, buflen);
79 static char local_buf[12];
80 static char *itoa(int n)
82 *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
86 # include "busybox.h" /* for applet_names */
89 /*#define MSHDEBUG 1*/
92 int mshdbg = MSHDEBUG;
94 #define DBGPRINTF(x) if (mshdbg>0) printf x
95 #define DBGPRINTF0(x) if (mshdbg>0) printf x
96 #define DBGPRINTF1(x) if (mshdbg>1) printf x
97 #define DBGPRINTF2(x) if (mshdbg>2) printf x
98 #define DBGPRINTF3(x) if (mshdbg>3) printf x
99 #define DBGPRINTF4(x) if (mshdbg>4) printf x
100 #define DBGPRINTF5(x) if (mshdbg>5) printf x
101 #define DBGPRINTF6(x) if (mshdbg>6) printf x
102 #define DBGPRINTF7(x) if (mshdbg>7) printf x
103 #define DBGPRINTF8(x) if (mshdbg>8) printf x
104 #define DBGPRINTF9(x) if (mshdbg>9) printf x
108 #define RCPRINTF(x) if (mshdbg_rc) printf x
113 #define DBGPRINTF0(x) ((void)0)
114 #define DBGPRINTF1(x) ((void)0)
115 #define DBGPRINTF2(x) ((void)0)
116 #define DBGPRINTF3(x) ((void)0)
117 #define DBGPRINTF4(x) ((void)0)
118 #define DBGPRINTF5(x) ((void)0)
119 #define DBGPRINTF6(x) ((void)0)
120 #define DBGPRINTF7(x) ((void)0)
121 #define DBGPRINTF8(x) ((void)0)
122 #define DBGPRINTF9(x) ((void)0)
124 #define RCPRINTF(x) ((void)0)
126 #endif /* MSHDEBUG */
129 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
130 # define DEFAULT_ROOT_PROMPT "\\u:\\w> "
131 # define DEFAULT_USER_PROMPT "\\u:\\w$ "
133 # define DEFAULT_ROOT_PROMPT "# "
134 # define DEFAULT_USER_PROMPT "$ "
138 /* -------- sh.h -------- */
144 #define NPUSH 8 /* limit to input nesting */
147 #define NOFILE 20 /* Number of open files */
148 #define NUFILE 10 /* Number of user-accessible files */
149 #define FDBASE 10 /* First file usable by Shell */
152 * values returned by wait
154 #define WAITSIG(s) ((s) & 0177)
155 #define WAITVAL(s) (((s) >> 8) & 0377)
156 #define WAITCORE(s) (((s) & 0200) != 0)
159 * library and system definitions
161 typedef void xint; /* base type of jmp_buf, for not broken compilers */
166 #define NOBLOCK ((struct op *)NULL)
167 #define NOWORD ((char *)NULL)
168 #define NOWORDS ((char **)NULL)
169 #define NOPIPE ((int *)NULL)
175 short io_unit; /* unit affected */
176 short io_flag; /* action (below) */
177 char *io_name; /* file name */
180 #define IOREAD 1 /* < */
181 #define IOHERE 2 /* << (here file) */
182 #define IOWRITE 4 /* > */
183 #define IOCAT 8 /* >> */
184 #define IOXHERE 16 /* ${}, ` in << */
185 #define IODUP 32 /* >&digit */
186 #define IOCLOSE 64 /* >&- */
188 #define IODEFAULT (-1) /* token for default IO unit */
192 * Description of a command or an operation on commands.
193 * Might eventually use a union.
196 int type; /* operation type, see below */
197 char **words; /* arguments to a command */
198 struct ioword **ioact; /* IO actions (eg, < > >>) */
201 char *str; /* identifier for case and for */
204 #define TCOM 1 /* command */
205 #define TPAREN 2 /* (c-list) */
206 #define TPIPE 3 /* a | b */
207 #define TLIST 4 /* a [&;] b */
208 #define TOR 5 /* || */
209 #define TAND 6 /* && */
217 #define TPAT 14 /* pattern in case */
218 #define TBRACE 15 /* {c-list} */
219 #define TASYNC 16 /* c & */
220 /* Added to support "." file expansion */
223 /* Strings for names to make debug easier */
225 static const char *const T_CMD_NAMES[] = {
248 * actions determining the environment of a process
250 #define FEXEC 1 /* execute without forking */
252 #define AREASIZE (90000)
255 * flags to control evaluation of words
257 #define DOSUB 1 /* interpret $, `, and quotes */
258 #define DOBLANK 2 /* perform blank interpretation */
259 #define DOGLOB 4 /* interpret [?* */
260 #define DOKEY 8 /* move words with `=' to 2nd arg. list */
261 #define DOTRIM 16 /* trim resulting string */
263 #define DOALL (DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM)
268 struct brkcon *nextlev;
272 static int trapset; /* trap pending */
274 static int yynerrs; /* yacc */
276 /* moved to G: static char line[LINELIM]; */
278 #if ENABLE_FEATURE_EDITING
279 static char *current_prompt;
280 static line_input_t *line_input_state;
287 static const char *rexecve(char *c, char **v, char **envp);
288 static char *evalstr(char *cp, int f);
289 static char *putn(int n);
290 static char *unquote(char *as);
291 static int rlookup(char *n);
292 static struct wdblock *glob(char *cp, struct wdblock *wb);
293 static int my_getc(int ec);
294 static int subgetc(char ec, int quoted);
295 static char **makenv(int all, struct wdblock *wb);
296 static char **eval(char **ap, int f);
297 static int setstatus(int s);
298 static int waitfor(int lastpid, int canintr);
300 static void onintr(int s); /* SIGINT handler */
302 static int newenv(int f);
303 static void quitenv(void);
304 static void next(int f);
305 static void setdash(void);
306 static void onecommand(void);
307 static void runtrap(int i);
310 /* -------- area stuff -------- */
312 #define REGSIZE sizeof(struct region)
314 /* #define SHRINKBY (64) */
318 #define ALIGN (sizeof(int)-1)
327 /* -------- grammar stuff -------- */
352 /* Added for "." file expansion */
355 #define YYERRCODE 300
358 #define CONTIN 01 /* skip new lines to complete command */
360 static struct op *pipeline(int cf);
361 static struct op *andor(void);
362 static struct op *c_list(void);
363 static int synio(int cf);
364 static void musthave(int c, int cf);
365 static struct op *simple(void);
366 static struct op *nested(int type, int mark);
367 static struct op *command(int cf);
368 static struct op *dogroup(int onlydone);
369 static struct op *thenpart(void);
370 static struct op *elsepart(void);
371 static struct op *caselist(void);
372 static struct op *casepart(void);
373 static char **pattern(void);
374 static char **wordlist(void);
375 static struct op *list(struct op *t1, struct op *t2);
376 static struct op *block(int type, struct op *t1, struct op *t2, char **wp);
377 static struct op *newtp(void);
378 static struct op *namelist(struct op *t);
379 static char **copyw(void);
380 static void word(char *cp);
381 static struct ioword **copyio(void);
382 static struct ioword *io(int u, int f, char *cp);
383 static int yylex(int cf);
384 static int collect(int c, int c1);
385 static int dual(int c);
386 static void diag(int ec);
387 static char *tree(unsigned size);
389 /* -------- var.h -------- */
398 #define COPYV 1 /* flag to setval, suggesting copy */
399 #define RONLY 01 /* variable is read-only */
400 #define EXPORT 02 /* variable is to be exported */
401 #define GETCELL 04 /* name & value space was got with getcell */
403 static int yyparse(void);
405 static int execute(struct op *t, int *pin, int *pout, int act);
408 /* -------- io.h -------- */
411 unsigned id; /* buffer id */
412 char buf[512]; /* buffer */
413 char *bufp; /* pointer into buffer */
414 char *ebufp; /* pointer to end of buffer */
417 /* possible arguments to an IO function */
421 int afile; /* file descriptor */
422 unsigned afid; /* buffer id */
423 long afpos; /* file position */
424 struct iobuf *afbuf; /* buffer for this file */
427 /* an input generator's state */
429 int (*iofn) (struct ioarg *, struct io *);
432 char prev; /* previous character read by readc() */
433 char nlcount; /* for `'s */
434 char xchar; /* for `'s */
435 char task; /* reason for pushed IO */
438 #define XOTHER 0 /* none of the below */
439 #define XDOLL 1 /* expanding ${} */
440 #define XGRAVE 2 /* expanding `'s */
441 #define XIO 3 /* file IO */
445 * input generators for IO structure
447 static int nlchar(struct ioarg *ap);
448 static int strchar(struct ioarg *ap);
449 static int qstrchar(struct ioarg *ap);
450 static int filechar(struct ioarg *ap);
451 static int herechar(struct ioarg *ap);
452 static int linechar(struct ioarg *ap);
453 static int gravechar(struct ioarg *ap, struct io *iop);
454 static int qgravechar(struct ioarg *ap, struct io *iop);
455 static int dolchar(struct ioarg *ap);
456 static int wdchar(struct ioarg *ap);
457 static void scraphere(void);
458 static void freehere(int area);
459 static void gethere(void);
460 static void markhere(char *s, struct ioword *iop);
461 static int herein(char *hname, int xdoll);
462 static int run(struct ioarg *argp, int (*f) (struct ioarg *));
465 static int eofc(void);
466 static int readc(void);
467 static void unget(int c);
468 static void ioecho(char c);
474 static void pushio(struct ioarg *argp, int (*f) (struct ioarg *));
475 #define PUSHIO(what,arg,gen) ((temparg.what = (arg)), pushio(&temparg,(gen)))
476 static int remap(int fd);
477 static int openpipe(int *pv);
478 static void closepipe(int *pv);
479 static struct io *setbase(struct io *ip);
481 /* -------- word.h -------- */
483 #define NSTART 16 /* default number of words to allow for initially */
488 /* bounds are arbitrary */
492 static struct wdblock *addword(char *wd, struct wdblock *wb);
493 static struct wdblock *newword(int nw);
494 static char **getwords(struct wdblock *wb);
496 /* -------- misc stuff -------- */
498 static int forkexec(struct op *t, int *pin, int *pout, int act, char **wp);
499 static int iosetup(struct ioword *iop, int pipein, int pipeout);
500 static void brkset(struct brkcon *bc);
501 static int dolabel(struct op *t);
502 static int dohelp(struct op *t);
503 static int dochdir(struct op *t);
504 static int doshift(struct op *t);
505 static int dologin(struct op *t);
506 static int doumask(struct op *t);
507 static int doexec(struct op *t);
508 static int dodot(struct op *t);
509 static int dowait(struct op *t);
510 static int doread(struct op *t);
511 static int doeval(struct op *t);
512 static int dotrap(struct op *t);
513 static int getsig(char *s);
514 static void setsig(int n, sighandler_t f);
515 static int getn(char *as);
516 static int dobreak(struct op *t);
517 static int docontinue(struct op *t);
518 static int brkcontin(char *cp, int val);
519 static int doexit(struct op *t);
520 static int doexport(struct op *t);
521 static int doreadonly(struct op *t);
522 static void rdexp(char **wp, void (*f) (struct var *), int key);
523 static void badid(char *s);
524 static int doset(struct op *t);
525 static void varput(char *s, int out);
526 static int dotimes(struct op *t);
527 static int expand(const char *cp, struct wdblock **wbp, int f);
528 static char *blank(int f);
529 static int dollar(int quoted);
530 static int grave(int quoted);
531 static void globname(char *we, char *pp);
532 static char *generate(char *start1, char *end1, char *middle, char *end);
533 static int anyspcl(struct wdblock *wb);
534 static int xstrcmp(char *p1, char *p2);
535 static void glob0(char *a0, unsigned a1, int a2,
536 int (*a3) (char *, char *));
537 static void readhere(char **name, char *s, int ec);
538 static int xxchar(struct ioarg *ap);
543 struct ioword *h_iop;
547 static const char *const signame[] = {
550 NULL, /* interrupt */
552 "Illegal instruction",
556 "Floating Point Exception",
561 NULL, /* broken pipe */
569 int (*builtinfunc)(struct op *t);
571 static const struct builtincmd builtincmds[] = {
574 { "break" , dobreak },
576 { "continue", docontinue },
580 { "export" , doexport },
582 { "login" , dologin },
583 { "newgrp" , dologin },
585 { "readonly", doreadonly },
587 { "shift" , doshift },
588 { "times" , dotimes },
590 { "umask" , doumask },
595 static struct op *scantree(struct op *);
596 static struct op *dowholefile(int, int);
604 static int interactive; /* Is this an interactive shell */
606 static int multiline; /* \n changed to ; */
607 static struct op *outtree; /* result from parser */
610 static struct brkcon *brklist;
612 static struct wdblock *wdlist;
613 static struct wdblock *iolist;
616 static struct var *mshdbg_var;
618 static struct var *vlist; /* dictionary */
619 static struct var *homedir; /* home directory */
620 static struct var *prompt; /* main prompt */
621 static struct var *cprompt; /* continuation prompt */
622 static struct var *path; /* search path for commands */
623 static struct var *shell; /* shell to interpret command files */
624 static struct var *ifs; /* field separators */
626 static int areanum; /* current allocation area */
627 static int intr; /* interrupt pending */
629 static char *null = (char*)""; /* null value for variable */
630 static int heedint = 1; /* heed interrupt signals */
631 static void (*qflag)(int) = SIG_IGN;
635 static int iounit = IODEFAULT;
636 static YYSTYPE yylval;
637 static char *elinep; /* done in main(): = line + sizeof(line) - 5 */
639 static struct here *inhere; /* list of hear docs while parsing */
640 static struct here *acthere; /* list of active here documents */
641 static struct region *areabot; /* bottom of area */
642 static struct region *areatop; /* top of area */
643 static struct region *areanxt; /* starting point of scan */
645 static void *brkaddr;
647 #define AFID_NOBUF (~0)
652 * parsing & execution environment
658 xint *errpt; /* void * */
665 struct env global_env;
666 struct ioarg temparg; // = { .afid = AFID_NOBUF }; /* temporary for PUSHIO */
667 unsigned bufid; // = AFID_ID; /* buffer id counter */
668 char ourtrap[_NSIG + 1];
669 char *trap[_NSIG + 1];
670 struct iobuf sharedbuf; /* in main(): set to { AFID_NOBUF } */
671 struct iobuf mainbuf; /* in main(): set to { AFID_NOBUF } */
672 struct ioarg ioargstack[NPUSH];
676 * -k: look for name=value everywhere on command line
678 * -t: exit after reading and executing one command
681 * -u: unset variables net diagnostic
683 char flags['z' - 'a' + 1];
684 char filechar_cmdbuf[BUFSIZ];
686 char child_cmd[LINELIM];
688 struct io iostack[NPUSH];
690 char grave__var_name[LINELIM];
691 char grave__alt_value[LINELIM];
694 #define G (*ptr_to_globals)
695 #define global_env (G.global_env )
696 #define temparg (G.temparg )
697 #define bufid (G.bufid )
698 #define ourtrap (G.ourtrap )
699 #define trap (G.trap )
700 #define sharedbuf (G.sharedbuf )
701 #define mainbuf (G.mainbuf )
702 #define ioargstack (G.ioargstack )
703 /* this looks weird, but is OK ... we index FLAG with 'a'...'z' */
704 #define FLAG (G.flags - 'a' )
705 #define filechar_cmdbuf (G.filechar_cmdbuf)
706 #define line (G.line )
707 #define child_cmd (G.child_cmd )
708 #define iostack (G.iostack )
709 #define INIT_G() do { \
710 PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
711 global_env.linep = line; \
712 global_env.iobase = iostack; \
713 global_env.iop = iostack - 1; \
714 global_env.iofd = FDBASE; \
715 temparg.afid = AFID_NOBUF; \
720 /* in substitution */
721 #define INSUB() (global_env.iop->task == XGRAVE || global_env.iop->task == XDOLL)
723 #define RUN(what, arg, gen) ((temparg.what = (arg)), run(&temparg, (gen)))
726 void print_t(struct op *t)
728 DBGPRINTF(("T: t=%p, type %s, words=%p, IOword=%p\n", t,
729 T_CMD_NAMES[t->type], t->words, t->ioact));
732 DBGPRINTF(("T: W1: %s", t->words[0]));
736 void print_tree(struct op *head)
739 DBGPRINTF(("PRINT_TREE: no tree\n"));
743 DBGPRINTF(("NODE: %p, left %p, right %p\n", head, head->left,
747 print_tree(head->left);
750 print_tree(head->right);
752 #endif /* MSHDEBUG */
758 static void prs(const char *s)
761 write(2, s, strlen(s));
764 static void prn(unsigned u)
769 static void echo(char **wp)
774 for (i = 0; wp[i]; i++) {
782 static void closef(int i)
788 static void closeall(void)
792 for (u = NUFILE; u < NOFILE;)
797 /* fail but return to process next command */
798 static void fail(void) ATTRIBUTE_NORETURN;
799 static void fail(void)
805 /* abort shell (or fail in subshell) */
806 static void leave(void) ATTRIBUTE_NORETURN;
807 static void leave(void)
809 DBGPRINTF(("LEAVE: leave called!\n"));
820 static void warn(const char *s)
831 static void err(const char *s)
838 if (global_env.errpt)
839 longjmp(global_env.errpt, 1);
841 global_env.iop = global_env.iobase = iostack;
845 /* -------- area.c -------- */
848 * All memory between (char *)areabot and (char *)(areatop+1) is
849 * exclusively administered by the area management routines.
850 * It is assumed that sbrk() and brk() manipulate the high end.
854 void * __q = (void *)-1; \
855 if (brkaddr + (int)(X) < brktop) { \
857 brkaddr += (int)(X); \
862 static void initarea(void)
864 brkaddr = xmalloc(AREASIZE);
865 brktop = brkaddr + AREASIZE;
867 while ((long) sbrk(0) & ALIGN)
869 areabot = (struct region *) sbrk(REGSIZE);
871 areabot->next = areabot;
872 areabot->area = BUSY;
877 static char *getcell(unsigned nbytes)
880 struct region *p, *q;
887 /* silly and defeats the algorithm */
889 * round upwards and add administration area
891 nregio = (nbytes + (REGSIZE - 1)) / REGSIZE + 1;
894 if (p->area > areanum) {
898 while ((q = p->next)->area > areanum && q != areanxt)
901 * exit loop if cell big enough
910 i = nregio >= GROWBY ? nregio : GROWBY;
911 p = (struct region *) sbrk(i * REGSIZE);
912 if (p == (struct region *) -1)
917 abort(); /* allocated areas are contiguous */
927 * we found a FREE area big enough, pointed to by 'p', and up to 'q'
929 areanxt = p + nregio;
932 * split into requested area and rest
934 if (areanxt + 1 > q) {
936 abort(); /* insufficient space left for admin */
939 areanxt->area = FREE;
943 return (char *) (p + 1);
946 static void freecell(char *cp)
950 p = (struct region *) cp;
958 #define DELETE(obj) freecell((char *)obj)
960 static void freearea(int a)
962 struct region *p, *top;
965 for (p = areabot; p != top; p = p->next)
970 static void setarea(char *cp, int a)
974 p = (struct region *) cp;
979 static int getarea(char *cp)
981 return ((struct region *) cp - 1)->area;
984 static void garbage(void)
986 struct region *p, *q, *top;
989 for (p = areabot; p != top; p = p->next) {
990 if (p->area > areanum) {
991 while ((q = p->next)->area > areanum)
997 if (areatop >= q + SHRINKBY && q->area > areanum) {
998 brk((char *) (q + 1));
1006 static char *space(int n)
1012 err("out of string space");
1016 static char *strsave(const char *s, int a)
1020 cp = space(strlen(s) + 1);
1022 // FIXME: I highly doubt this is good.
1031 /* -------- var.c -------- */
1033 static int eqname(const char *n1, const char *n2)
1035 for (; *n1 != '=' && *n1 != '\0'; n1++)
1038 return *n2 == '\0' || *n2 == '=';
1041 static const char *findeq(const char *cp)
1043 while (*cp != '\0' && *cp != '=')
1049 * Find the given name in the dictionary
1050 * and return its value. If the name was
1051 * not previously there, enter it now and
1052 * return a null value.
1054 static struct var *lookup(const char *n)
1056 // FIXME: dirty hack
1057 static struct var dummy;
1065 dummy.name = (char*)n;
1066 for (c = 0; isdigit(*n) && c < 1000; n++)
1067 c = c * 10 + *n - '0';
1068 dummy.status = RONLY;
1069 dummy.value = (c <= dolc ? dolv[c] : null);
1073 for (vp = vlist; vp; vp = vp->next)
1074 if (eqname(vp->name, n))
1078 vp = (struct var *) space(sizeof(*vp));
1079 if (vp == 0 || (vp->name = space((int) (cp - n) + 2)) == 0) {
1080 dummy.name = dummy.value = (char*)"";
1085 while ((*xp = *n++) != '\0' && *xp != '=')
1089 setarea((char *) vp, 0);
1090 setarea((char *) vp->name, 0);
1093 vp->status = GETCELL;
1099 * if name is not NULL, it must be
1100 * a prefix of the space `val',
1102 * this is all so that exporting
1103 * values is reasonably painless.
1105 static void nameval(struct var *vp, const char *val, const char *name)
1111 if (vp->status & RONLY) {
1113 while (*xp && *xp != '=')
1114 fputc(*xp++, stderr);
1115 err(" is read-only");
1120 xp = space(strlen(vp->name) + strlen(val) + 2);
1123 /* make string: name=value */
1127 while ((*xp = *cp++) != '\0' && *xp != '=')
1134 if (vp->status & GETCELL)
1135 freecell(vp->name); /* form new string `name=value' */
1136 vp->name = (char*)name;
1137 vp->value = (char*)val;
1142 * give variable at `vp' the value `val'.
1144 static void setval(struct var *vp, const char *val)
1146 nameval(vp, val, NULL);
1149 static void export(struct var *vp)
1151 vp->status |= EXPORT;
1154 static void ronly(struct var *vp)
1156 if (isalpha(vp->name[0]) || vp->name[0] == '_') /* not an internal symbol */
1157 vp->status |= RONLY;
1160 static int isassign(const char *s)
1163 DBGPRINTF7(("ISASSIGN: enter, s=%s\n", s));
1166 /* no isalpha() - we shouldn't use locale */
1167 /* c | 0x20 - lowercase (Latin) letters */
1168 if (c != '_' && (unsigned)((c|0x20) - 'a') > 25)
1179 && (unsigned)(c - '0') > 9 /* not number */
1180 && (unsigned)((c|0x20) - 'a') > 25 /* not letter */
1187 static int assign(const char *s, int cf)
1192 DBGPRINTF7(("ASSIGN: enter, s=%s, cf=%d\n", s, cf));
1194 if (!isalpha(*s) && *s != '_')
1196 for (cp = s; *cp != '='; cp++)
1197 if (*cp == '\0' || (!isalnum(*cp) && *cp != '_'))
1200 nameval(vp, ++cp, cf == COPYV ? NULL : s);
1202 vp->status &= ~GETCELL;
1206 static int checkname(char *cp)
1208 DBGPRINTF7(("CHECKNAME: enter, cp=%s\n", cp));
1210 if (!isalpha(*cp++) && *(cp - 1) != '_')
1213 if (!isalnum(*cp++) && *(cp - 1) != '_')
1218 static void putvlist(int f, int out)
1222 for (vp = vlist; vp; vp = vp->next) {
1223 if (vp->status & f && (isalpha(*vp->name) || *vp->name == '_')) {
1224 if (vp->status & EXPORT)
1225 write(out, "export ", 7);
1226 if (vp->status & RONLY)
1227 write(out, "readonly ", 9);
1228 write(out, vp->name, (int) (findeq(vp->name) - vp->name));
1229 write(out, "\n", 1);
1238 static void sig(int i)
1244 static void runtrap(int i)
1249 if (trapstr == NULL)
1255 RUN(aword, trapstr, nlchar);
1259 static void setdash(void)
1263 char m['z' - 'a' + 1];
1266 for (c = 'a'; c <= 'z'; c++)
1270 setval(lookup("-"), m);
1273 static int newfile(char *s)
1277 DBGPRINTF7(("NEWFILE: opening %s\n", s));
1280 if (NOT_LONE_DASH(s)) {
1281 DBGPRINTF(("NEWFILE: s is %s\n", s));
1282 f = open(s, O_RDONLY);
1285 err(": cannot open");
1295 struct op *scantree(struct op *head)
1302 if (head->left != NULL) {
1303 dotnode = scantree(head->left);
1308 if (head->right != NULL) {
1309 dotnode = scantree(head->right);
1314 if (head->words == NULL)
1317 DBGPRINTF5(("SCANTREE: checking node %p\n", head));
1319 if ((head->type != TDOT) && LONE_CHAR(head->words[0], '.')) {
1320 DBGPRINTF5(("SCANTREE: dot found in node %p\n", head));
1328 static void onecommand(void)
1333 DBGPRINTF(("ONECOMMAND: enter, outtree=%p\n", outtree));
1335 while (global_env.oenv)
1344 global_env.errpt = 0;
1345 global_env.linep = line;
1353 setjmp(failpt); /* Bruce Evans' fix */
1355 if (setjmp(failpt) || yyparse() || intr) {
1356 DBGPRINTF(("ONECOMMAND: this is not good.\n"));
1358 while (global_env.oenv)
1361 if (!interactive && intr)
1374 DBGPRINTF(("ONECOMMAND: calling execute, t=outtree=%p\n",
1376 execute(outtree, NOPIPE, NOPIPE, 0);
1379 if (!interactive && intr) {
1391 static int newenv(int f)
1395 DBGPRINTF(("NEWENV: f=%d (indicates quitenv and return)\n", f));
1402 ep = (struct env *) space(sizeof(*ep));
1404 while (global_env.oenv)
1409 global_env.oenv = ep;
1410 global_env.errpt = errpt;
1415 static void quitenv(void)
1420 DBGPRINTF(("QUITENV: global_env.oenv=%p\n", global_env.oenv));
1422 ep = global_env.oenv;
1424 fd = global_env.iofd;
1426 /* should close `'d files */
1428 while (--fd >= global_env.iofd)
1434 * Is character c in s?
1436 static int any(int c, const char *s)
1445 * Is any character from s1 in s2?
1447 static int anys(const char *s1, const char *s2)
1455 static char *putn(int n)
1460 static void next(int f)
1462 PUSHIO(afile, f, filechar);
1465 static void onintr(int s) /* ANSI C requires a parameter */
1467 signal(SIGINT, onintr);
1474 } else if (heedint) {
1481 /* -------- gmatch.c -------- */
1483 * int gmatch(string, pattern)
1484 * char *string, *pattern;
1486 * Match a pattern as in sh(1).
1491 #define QMASK (CMASK & ~QUOTE)
1492 #define NOT '!' /* might use ^ */
1494 static const char *cclass(const char *p, int sub)
1496 int c, d, not, found;
1506 if (p[1] == '-' && p[2] != ']') {
1511 if (c == sub || (c <= sub && sub <= d))
1513 } while (*++p != ']');
1514 return found ? p + 1 : NULL;
1517 static int gmatch(const char *s, const char *p)
1521 if (s == NULL || p == NULL)
1524 while ((pc = *p++ & CMASK) != '\0') {
1541 if (*p == '\0' || gmatch(s, p))
1543 } while (*s++ != '\0');
1547 if (sc != (pc & ~QUOTE))
1555 /* -------- csyn.c -------- */
1557 * shell: syntax (C version)
1560 static void yyerror(const char *s) ATTRIBUTE_NORETURN;
1561 static void yyerror(const char *s)
1564 if (interactive && global_env.iop <= iostack) {
1566 while (eofc() == 0 && yylex(0) != '\n');
1572 static void zzerr(void) ATTRIBUTE_NORETURN;
1573 static void zzerr(void)
1575 yyerror("syntax error");
1580 DBGPRINTF7(("YYPARSE: enter...\n"));
1587 return (yynerrs != 0);
1590 static struct op *pipeline(int cf)
1595 DBGPRINTF7(("PIPELINE: enter, cf=%d\n", cf));
1599 DBGPRINTF9(("PIPELINE: t=%p\n", t));
1602 while ((c = yylex(0)) == '|') {
1603 p = command(CONTIN);
1605 DBGPRINTF8(("PIPELINE: error!\n"));
1609 if (t->type != TPAREN && t->type != TCOM) {
1610 /* shell statement */
1611 t = block(TPAREN, t, NOBLOCK, NOWORDS);
1614 t = block(TPIPE, t, p, NOWORDS);
1619 DBGPRINTF7(("PIPELINE: returning t=%p\n", t));
1623 static struct op *andor(void)
1628 DBGPRINTF7(("ANDOR: enter...\n"));
1632 DBGPRINTF9(("ANDOR: t=%p\n", t));
1635 while ((c = yylex(0)) == LOGAND || c == LOGOR) {
1636 p = pipeline(CONTIN);
1638 DBGPRINTF8(("ANDOR: error!\n"));
1642 t = block(c == LOGAND ? TAND : TOR, t, p, NOWORDS);
1648 DBGPRINTF7(("ANDOR: returning t=%p\n", t));
1652 static struct op *c_list(void)
1657 DBGPRINTF7(("C_LIST: enter...\n"));
1664 t = block(TASYNC, t, NOBLOCK, NOWORDS);
1666 while ((c = yylex(0)) == ';' || c == '&'
1667 || (multiline && c == '\n')) {
1675 p = block(TASYNC, p, NOBLOCK, NOWORDS);
1683 DBGPRINTF7(("C_LIST: returning t=%p\n", t));
1687 static int synio(int cf)
1693 DBGPRINTF7(("SYNIO: enter, cf=%d\n", cf));
1696 if (c != '<' && c != '>') {
1703 iop = io(iounit, i, yylval.cp);
1707 markhere(yylval.cp, iop);
1709 DBGPRINTF7(("SYNIO: returning 1\n"));
1713 static void musthave(int c, int cf)
1715 peeksym = yylex(cf);
1717 DBGPRINTF7(("MUSTHAVE: error!\n"));
1724 static struct op *simple(void)
1730 switch (peeksym = yylex(0)) {
1751 static struct op *nested(int type, int mark)
1755 DBGPRINTF3(("NESTED: enter, type=%d, mark=%d\n", type, mark));
1761 return block(type, t, NOBLOCK, NOWORDS);
1764 static struct op *command(int cf)
1767 struct wdblock *iosave;
1770 DBGPRINTF(("COMMAND: enter, cf=%d\n", cf));
1796 t = nested(TPAREN, ')');
1800 t = nested(TBRACE, '}');
1810 t->words = wordlist();
1812 if (c != '\n' && c != ';')
1814 t->left = dogroup(0);
1822 t->type = c == WHILE ? TWHILE : TUNTIL;
1824 t->right = dogroup(1);
1836 musthave(IN, CONTIN);
1839 t->left = caselist();
1850 t->right = thenpart();
1859 musthave(WORD, 0); /* gets name of file */
1860 DBGPRINTF7(("COMMAND: DOT clause, yylval.cp is %s\n", yylval.cp));
1862 word(yylval.cp); /* add word to wdlist */
1863 word(NOWORD); /* terminate wdlist */
1864 t->words = copyw(); /* dup wdlist */
1874 DBGPRINTF(("COMMAND: returning %p\n", t));
1879 static struct op *dowholefile(int type, int mark)
1883 DBGPRINTF(("DOWHOLEFILE: enter, type=%d, mark=%d\n", type, mark));
1888 t = block(type, t, NOBLOCK, NOWORDS);
1889 DBGPRINTF(("DOWHOLEFILE: return t=%p\n", t));
1893 static struct op *dogroup(int onlydone)
1899 if (c == DONE && onlydone)
1908 static struct op *thenpart(void)
1921 if (t->left == NULL)
1923 t->right = elsepart();
1927 static struct op *elsepart(void)
1932 switch (c = yylex(0)) {
1943 t->right = thenpart();
1952 static struct op *caselist(void)
1957 while ((peeksym = yylex(CONTIN)) != ESAC) {
1958 DBGPRINTF(("CASELIST, doing yylex, peeksym=%d\n", peeksym));
1959 t = list(t, casepart());
1962 DBGPRINTF(("CASELIST, returning t=%p\n", t));
1966 static struct op *casepart(void)
1970 DBGPRINTF7(("CASEPART: enter...\n"));
1974 t->words = pattern();
1977 peeksym = yylex(CONTIN);
1978 if (peeksym != ESAC)
1979 musthave(BREAK, CONTIN);
1981 DBGPRINTF7(("CASEPART: made newtp(TPAT, t=%p)\n", t));
1986 static char **pattern(void)
2003 static char **wordlist(void)
2013 while ((c = yylex(0)) == WORD)
2021 * supporting functions
2023 static struct op *list(struct op *t1, struct op *t2)
2025 DBGPRINTF7(("LIST: enter, t1=%p, t2=%p\n", t1, t2));
2032 return block(TLIST, t1, t2, NOWORDS);
2035 static struct op *block(int type, struct op *t1, struct op *t2, char **wp)
2039 DBGPRINTF7(("BLOCK: enter, type=%d (%s)\n", type, T_CMD_NAMES[type]));
2047 DBGPRINTF7(("BLOCK: inserted %p between %p and %p\n", t, t1,
2053 /* See if given string is a shell multiline (FOR, IF, etc) */
2054 static int rlookup(char *n)
2060 static const struct res restab[] = {
2083 const struct res *rp;
2085 DBGPRINTF7(("RLOOKUP: enter, n is %s\n", n));
2087 for (rp = restab; rp->r_name[0]; rp++)
2088 if (strcmp(rp->r_name, n) == 0) {
2089 DBGPRINTF7(("RLOOKUP: match, returning %d\n", rp->r_val));
2090 return rp->r_val; /* Return numeric code for shell multiline */
2093 DBGPRINTF7(("RLOOKUP: NO match, returning 0\n"));
2094 return 0; /* Not a shell multiline */
2097 static struct op *newtp(void)
2101 t = (struct op *) tree(sizeof(*t));
2109 DBGPRINTF3(("NEWTP: allocated %p\n", t));
2114 static struct op *namelist(struct op *t)
2116 DBGPRINTF7(("NAMELIST: enter, t=%p, type %s, iolist=%p\n", t,
2117 T_CMD_NAMES[t->type], iolist));
2120 iolist = addword((char *) NULL, iolist);
2121 t->ioact = copyio();
2125 if (t->type != TCOM) {
2126 if (t->type != TPAREN && t->ioact != NULL) {
2127 t = block(TPAREN, t, NOBLOCK, NOWORDS);
2128 t->ioact = t->left->ioact;
2129 t->left->ioact = NULL;
2140 static char **copyw(void)
2144 wd = getwords(wdlist);
2149 static void word(char *cp)
2151 wdlist = addword(cp, wdlist);
2154 static struct ioword **copyio(void)
2156 struct ioword **iop;
2158 iop = (struct ioword **) getwords(iolist);
2163 static struct ioword *io(int u, int f, char *cp)
2167 iop = (struct ioword *) tree(sizeof(*iop));
2171 iolist = addword((char *) iop, iolist);
2175 static int yylex(int cf)
2192 global_env.linep = line;
2195 line[LINELIM - 1] = '\0';
2198 while ((c = my_getc(0)) == ' ' || c == '\t') /* Skip whitespace */
2203 if (any(c, "0123456789")) {
2206 if (c1 == '<' || c1 == '>') {
2210 *global_env.linep++ = c;
2215 case '#': /* Comment, skip to next newline or End-of-string */
2216 while ((c = my_getc(0)) != '\0' && c != '\n');
2221 DBGPRINTF5(("YYLEX: return 0, c=%d\n", c));
2225 DBGPRINTF9(("YYLEX: found $\n"));
2226 *global_env.linep++ = c;
2229 c = collect(c, '}');
2248 /* If more chars process them, else return NULL char */
2266 if (multiline || cf & CONTIN) {
2267 if (interactive && global_env.iop <= iostack) {
2268 #if ENABLE_FEATURE_EDITING
2269 current_prompt = cprompt->value;
2271 prs(cprompt->value);
2288 while ((c = my_getc(0)) != '\0' && !any(c, "`$ '\"\t;&<>()|^\n")) {
2289 if (global_env.linep >= elinep)
2290 err("word too long");
2292 *global_env.linep++ = c;
2297 if (any(c, "\"'`$"))
2300 *global_env.linep++ = '\0';
2310 yylval.cp = strsave(line, areanum);
2315 static int collect(int c, int c1)
2319 DBGPRINTF8(("COLLECT: enter, c=%d, c1=%d\n", c, c1));
2321 *global_env.linep++ = c;
2322 while ((c = my_getc(c1)) != c1) {
2331 if (interactive && c == '\n' && global_env.iop <= iostack) {
2332 #if ENABLE_FEATURE_EDITING
2333 current_prompt = cprompt->value;
2335 prs(cprompt->value);
2338 *global_env.linep++ = c;
2341 *global_env.linep++ = c;
2343 DBGPRINTF8(("COLLECT: return 0, line is %s\n", line));
2348 /* "multiline commands" helper func */
2349 /* see if next 2 chars form a shell multiline */
2350 static int dual(int c)
2355 DBGPRINTF8(("DUAL: enter, c=%d\n", c));
2357 *cp++ = c; /* c is the given "peek" char */
2358 *cp++ = my_getc(0); /* get next char of input */
2359 *cp = '\0'; /* add EOS marker */
2361 c = rlookup(s); /* see if 2 chars form a shell multiline */
2363 unget(*--cp); /* String is not a shell multiline, put peek char back */
2365 return c; /* String is multiline, return numeric multiline (restab) code */
2368 static void diag(int ec)
2372 DBGPRINTF8(("DIAG: enter, ec=%d\n", ec));
2375 if (c == '>' || c == '<') {
2378 yylval.i = (ec == '>' ? IOWRITE | IOCAT : IOHERE);
2381 yylval.i = (ec == '>' ? IOWRITE : IOREAD);
2382 if (c != '&' || yylval.i == IOHERE)
2388 static char *tree(unsigned size)
2394 DBGPRINTF2(("TREE: getcell(%d) failed!\n", size));
2395 prs("command line too complicated\n");
2406 /* -------- exec.c -------- */
2408 static struct op **find1case(struct op *t, const char *w)
2416 DBGPRINTF3(("FIND1CASE: enter, t==NULL, returning.\n"));
2420 DBGPRINTF3(("FIND1CASE: enter, t->type=%d (%s)\n", t->type,
2421 T_CMD_NAMES[t->type]));
2423 if (t->type == TLIST) {
2424 tp = find1case(t->left, w);
2426 DBGPRINTF3(("FIND1CASE: found one to the left, returning tp=%p\n", tp));
2429 t1 = t->right; /* TPAT */
2433 for (wp = t1->words; *wp;) {
2434 cp = evalstr(*wp++, DOSUB);
2435 if (cp && gmatch(w, cp)) {
2436 DBGPRINTF3(("FIND1CASE: returning &t1->left= %p.\n",
2442 DBGPRINTF(("FIND1CASE: returning NULL\n"));
2446 static struct op *findcase(struct op *t, const char *w)
2450 tp = find1case(t, w);
2451 return tp != NULL ? *tp : NULL;
2458 static int execute(struct op *t, int *pin, int *pout, int act)
2461 volatile int i, rv, a;
2465 struct op *outtree_save;
2469 /* Avoid longjmp clobbering */
2474 DBGPRINTF4(("EXECUTE: enter, t==null, returning.\n"));
2478 DBGPRINTF(("EXECUTE: t=%p, t->type=%d (%s), t->words is %s\n", t,
2479 t->type, T_CMD_NAMES[t->type],
2480 ((t->words == NULL) ? "NULL" : t->words[0])));
2484 wp = (wp2 = t->words) != NULL
2485 ? eval(wp2, t->type == TCOM ? DOALL : DOALL & ~DOKEY)
2490 DBGPRINTF3(("EXECUTE: TDOT\n"));
2492 outtree_save = outtree;
2494 newfile(evalstr(t->words[0], DOALL));
2496 t->left = dowholefile(TLIST, 0);
2499 outtree = outtree_save;
2502 rv = execute(t->left, pin, pout, 0);
2504 rv = execute(t->right, pin, pout, 0);
2508 rv = execute(t->left, pin, pout, 0);
2512 rv = forkexec(t, pin, pout, act, wp);
2522 pv[0] = remap(pv[0]);
2523 pv[1] = remap(pv[1]);
2524 (void) execute(t->left, pin, pv, 0);
2525 rv = execute(t->right, pv, pout, 0);
2530 (void) execute(t->left, pin, pout, 0);
2531 rv = execute(t->right, pin, pout, 0);
2536 int hinteractive = interactive;
2538 DBGPRINTF7(("EXECUTE: TASYNC clause, calling vfork()...\n"));
2541 if (i == 0) { /* child */
2542 signal(SIGINT, SIG_IGN);
2543 signal(SIGQUIT, SIG_IGN);
2545 signal(SIGTERM, SIG_DFL);
2549 xopen(bb_dev_null, O_RDONLY);
2551 _exit(execute(t->left, pin, pout, FEXEC));
2553 interactive = hinteractive;
2555 setval(lookup("!"), putn(i));
2570 rv = execute(t->left, pin, pout, 0);
2572 if (t1 != NULL && (rv == 0) == (t->type == TAND))
2573 rv = execute(t1, pin, pout, 0);
2584 while (*wp++ != NULL);
2586 vp = lookup(t->str);
2587 while (setjmp(bc.brkpt))
2591 for (t1 = t->left; i-- && *wp != NULL;) {
2593 rv = execute(t1, pin, pout, 0);
2595 brklist = brklist->nextlev;
2600 while (setjmp(bc.brkpt))
2605 while ((execute(t1, pin, pout, 0) == 0) == (t->type == TWHILE))
2606 rv = execute(t->right, pin, pout, 0);
2607 brklist = brklist->nextlev;
2612 if (t->right != NULL) {
2613 rv = !execute(t->left, pin, pout, 0) ?
2614 execute(t->right->left, pin, pout, 0) :
2615 execute(t->right->right, pin, pout, 0);
2620 cp = evalstr(t->str, DOSUB | DOTRIM);
2624 DBGPRINTF7(("EXECUTE: TCASE, t->str is %s, cp is %s\n",
2625 ((t->str == NULL) ? "NULL" : t->str),
2626 ((cp == NULL) ? "NULL" : cp)));
2628 t1 = findcase(t->left, cp);
2630 DBGPRINTF7(("EXECUTE: TCASE, calling execute(t=%p, t1=%p)...\n", t, t1));
2631 rv = execute(t1, pin, pout, 0);
2632 DBGPRINTF7(("EXECUTE: TCASE, back from execute(t=%p, t1=%p)...\n", t, t1));
2641 if (iosetup(*iopp++, pin!=NULL, pout!=NULL)) {
2649 rv = execute(t1, pin, pout, 0);
2662 if (interactive && intr) {
2673 DBGPRINTF(("EXECUTE: returning from t=%p, rv=%d\n", t, rv));
2677 typedef int (*builtin_func_ptr)(struct op *);
2679 static builtin_func_ptr inbuilt(const char *s)
2681 const struct builtincmd *bp;
2683 for (bp = builtincmds; bp->name; bp++)
2684 if (strcmp(bp->name, s) == 0)
2685 return bp->builtinfunc;
2689 static int forkexec(struct op *t, int *pin, int *pout, int act, char **wp)
2693 builtin_func_ptr shcom = NULL;
2695 const char *cp = NULL;
2696 struct ioword **iopp;
2706 struct brkcon *hbrklist;
2710 /* Avoid longjmp clobbering */
2720 DBGPRINTF(("FORKEXEC: t=%p, pin %p, pout %p, act %d\n", t, pin,
2722 DBGPRINTF7(("FORKEXEC: t->words is %s\n",
2723 ((t->words == NULL) ? "NULL" : t->words[0])));
2727 rv = -1; /* system-detected error */
2728 if (t->type == TCOM) {
2729 while (*wp++ != NULL)
2733 /* strip all initial assignments */
2734 /* not correct wrt PATH=yyy command etc */
2736 DBGPRINTF9(("FORKEXEC: echo'ing, cp=%p, wp=%p, owp=%p\n",
2738 echo(cp ? wp : owp);
2741 if (cp == NULL && t->ioact == NULL) {
2742 while ((cp = *owp++) != NULL && assign(cp, COPYV))
2744 DBGPRINTF(("FORKEXEC: returning setstatus()\n"));
2745 return setstatus(0);
2748 shcom = inbuilt(cp);
2755 DBGPRINTF(("FORKEXEC: shcom %p, f&FEXEC 0x%x, owp %p\n", shcom,
2758 if (shcom == NULL && (f & FEXEC) == 0) {
2759 /* Save values in case the child process alters them */
2763 hinteractive = interactive;
2768 DBGPRINTF3(("FORKEXEC: calling vfork()...\n"));
2773 DBGPRINTF(("FORKEXEC: ERROR, cannot vfork()!\n"));
2777 if (newpid > 0) { /* Parent */
2778 /* Restore values */
2782 interactive = hinteractive;
2793 return (pout == NULL ? setstatus(waitfor(newpid, 0)) : 0);
2796 /* Must be the child process, pid should be 0 */
2797 DBGPRINTF(("FORKEXEC: child process, shcom=%p\n", shcom));
2800 signal(SIGINT, SIG_IGN);
2801 signal(SIGQUIT, SIG_IGN);
2812 while ((cp = *owp++) != NULL && assign(cp, COPYV))
2817 if ((pin != NULL || pout != NULL) && shcom != NULL && shcom != doexec) {
2818 err("piping to/from shell builtins not yet done");
2826 xmove_fd(pin[0], 0);
2831 xmove_fd(pout[1], 1);
2838 if (shcom != NULL && shcom != doexec) {
2840 err(": cannot redirect shell command");
2846 if (iosetup(*iopp++, pin != NULL, pout != NULL)) {
2854 i = setstatus((*shcom) (t));
2857 DBGPRINTF(("FORKEXEC: returning i=%d\n", i));
2861 /* should use FIOCEXCL */
2862 for (i = FDBASE; i < NOFILE; i++)
2865 signal(SIGINT, SIG_DFL);
2866 signal(SIGQUIT, SIG_DFL);
2869 if (t->type == TPAREN)
2870 _exit(execute(t->left, NOPIPE, NOPIPE, FEXEC));
2874 cp = rexecve(wp[0], wp, makenv(0, NULL));
2881 DBGPRINTF(("FORKEXEC: calling leave(), pid=%d\n", newpid));
2889 * 0< 1> are ignored as required
2892 static int iosetup(struct ioword *iop, int pipein, int pipeout)
2898 DBGPRINTF(("IOSETUP: iop %p, pipein %i, pipeout %i\n", iop,
2901 if (iop->io_unit == IODEFAULT) /* take default */
2902 iop->io_unit = iop->io_flag & (IOREAD | IOHERE) ? 0 : 1;
2904 if (pipein && iop->io_unit == 0)
2907 if (pipeout && iop->io_unit == 1)
2910 msg = iop->io_flag & (IOREAD | IOHERE) ? "open" : "create";
2911 if ((iop->io_flag & IOHERE) == 0) {
2912 cp = iop->io_name; /* huh?? */
2913 cp = evalstr(cp, DOSUB | DOTRIM);
2918 if (iop->io_flag & IODUP) {
2919 if (cp[1] || (!isdigit(*cp) && *cp != '-')) {
2921 err(": illegal >& argument");
2925 iop->io_flag = IOCLOSE;
2926 iop->io_flag &= ~(IOREAD | IOWRITE);
2928 switch (iop->io_flag) {
2930 u = open(cp, O_RDONLY);
2934 case IOHERE | IOXHERE:
2935 u = herein(iop->io_name, iop->io_flag & IOXHERE);
2936 cp = (char*)"here file";
2939 case IOWRITE | IOCAT:
2940 u = open(cp, O_WRONLY);
2942 lseek(u, (long) 0, SEEK_END);
2946 u = creat(cp, 0666);
2950 u = dup2(*cp - '0', iop->io_unit);
2954 close(iop->io_unit);
2963 if (u != iop->io_unit) {
2964 dup2(u, iop->io_unit);
2971 * Enter a new loop level (marked for break/continue).
2973 static void brkset(struct brkcon *bc)
2975 bc->nextlev = brklist;
2980 * Wait for the last process created.
2981 * Print a message for each process found
2982 * that was killed by a signal.
2983 * Ignore interrupt signals while waiting
2984 * unless `canintr' is true.
2986 static int waitfor(int lastpid, int canintr)
2990 int oheedint = heedint;
2997 if (errno != EINTR || canintr)
3002 if (rv < ARRAY_SIZE(signame)) {
3003 if (signame[rv] != NULL) {
3004 if (pid != lastpid) {
3011 if (pid != lastpid) {
3020 prs(" - core dumped");
3021 if (rv >= ARRAY_SIZE(signame) || signame[rv])
3027 } while (pid != lastpid);
3042 static int setstatus(int s)
3045 setval(lookup("?"), putn(s));
3050 * PATH-searching interface to execve.
3051 * If getenv("PATH") were kept up-to-date,
3052 * execvp might be used.
3054 static const char *rexecve(char *c, char **v, char **envp)
3059 int eacces = 0, asis = 0;
3062 if (ENABLE_FEATURE_SH_STANDALONE) {
3063 if (find_applet_by_name(name) >= 0) {
3064 /* We have to exec here since we vforked. Running
3065 * run_applet_and_exit() won't work and bad things
3067 execve(bb_busybox_exec_path, v, envp);
3071 DBGPRINTF(("REXECVE: c=%p, v=%p, envp=%p\n", c, v, envp));
3073 sp = any('/', c) ? "" : path->value;
3074 asis = (*sp == '\0');
3075 while (asis || *sp != '\0') {
3077 tp = global_env.linep;
3078 for (; *sp != '\0'; tp++) {
3081 asis = (*sp == '\0');
3085 if (tp != global_env.linep)
3087 for (i = 0; (*tp++ = c[i++]) != '\0';);
3089 DBGPRINTF3(("REXECVE: global_env.linep is %s\n", global_env.linep));
3091 execve(global_env.linep, v, envp);
3095 *v = global_env.linep;
3097 *v = global_env.linep;
3098 execve(DEFAULT_SHELL, v, envp);
3103 return (char *) bb_msg_memory_exhausted;
3106 return "argument list too long";
3113 return errno == ENOENT ? "not found" : "cannot execute";
3117 * Run the command produced by generator `f'
3118 * applied to stream `arg'.
3120 static int run(struct ioarg *argp, int (*f) (struct ioarg *))
3123 struct wdblock *swdlist;
3124 struct wdblock *siolist;
3130 /* Avoid longjmp clobbering */
3134 DBGPRINTF(("RUN: enter, areanum %d, outtree %p, failpt %p\n",
3135 areanum, outtree, failpt));
3145 if (newenv(setjmp(errpt)) == 0) {
3149 global_env.iobase = global_env.iop;
3152 if (setjmp(failpt) == 0 && yyparse() == 0)
3153 rv = execute(outtree, NOPIPE, NOPIPE, 0);
3156 DBGPRINTF(("RUN: error from newenv()!\n"));
3163 freearea(areanum--);
3168 /* -------- do.c -------- */
3171 * built-in commands: doX
3174 static int dohelp(struct op *t)
3177 const struct builtincmd *x;
3179 puts("\nBuilt-in commands:\n"
3180 "-------------------");
3185 col += printf("%c%s", ((col == 0) ? '\t' : ' '), x->name);
3192 #if ENABLE_FEATURE_SH_STANDALONE
3194 const char *applet = applet_names;
3197 col += printf("%c%s", ((col == 0) ? '\t' : ' '), applet);
3202 applet += strlen(applet) + 1;
3207 return EXIT_SUCCESS;
3210 static int dolabel(struct op *t)
3215 static int dochdir(struct op *t)
3217 const char *cp, *er;
3221 cp = homedir->value;
3224 er = ": no home directory";
3229 er = ": bad directory";
3231 prs(cp != NULL ? cp : "cd");
3236 static int doshift(struct op *t)
3240 n = t->words[1] ? getn(t->words[1]) : 1;
3242 err("nothing to shift");
3248 setval(lookup("#"), putn(dolc));
3253 * execute login and newgrp directly
3255 static int dologin(struct op *t)
3260 signal(SIGINT, SIG_DFL);
3261 signal(SIGQUIT, SIG_DFL);
3263 cp = rexecve(t->words[0], t->words, makenv(0, NULL));
3270 static int doumask(struct op *t)
3279 for (n = 3 * 4; (n -= 3) >= 0;)
3280 fputc('0' + ((i >> n) & 07), stderr);
3281 fputc('\n', stderr);
3283 /* huh??? '8','9' are not allowed! */
3284 for (n = 0; *cp >= '0' && *cp <= '9'; cp++)
3285 n = n * 8 + (*cp - '0');
3291 static int doexec(struct op *t)
3298 for (i = 0; (t->words[i] = t->words[i + 1]) != NULL; i++);
3304 if (setjmp(failpt) == 0)
3305 execute(t, NOPIPE, NOPIPE, FEXEC);
3311 static int dodot(struct op *t)
3319 DBGPRINTF(("DODOT: enter, t=%p, tleft %p, tright %p, global_env.linep is %s\n",
3320 t, t->left, t->right, ((global_env.linep == NULL) ? "NULL" : global_env.linep)));
3324 DBGPRINTF(("DODOT: bad args, ret 0\n"));
3327 DBGPRINTF(("DODOT: cp is %s\n", cp));
3329 sp = any('/', cp) ? ":" : path->value;
3331 DBGPRINTF(("DODOT: sp is %s, global_env.linep is %s\n",
3332 ((sp == NULL) ? "NULL" : sp),
3333 ((global_env.linep == NULL) ? "NULL" : global_env.linep)));
3336 tp = global_env.linep;
3337 while (*sp && (*tp = *sp++) != ':')
3339 if (tp != global_env.linep)
3342 for (i = 0; (*tp++ = cp[i++]) != '\0';);
3345 i = open(global_env.linep, O_RDONLY);
3349 DBGPRINTF(("DODOT: remap=%d, exstat=%d, global_env.iofd %d, i %d, global_env.linep is %s\n",
3350 maltmp, exstat, global_env.iofd, i, global_env.linep));
3352 next(maltmp); /* Basically a PUSHIO */
3354 DBGPRINTF(("DODOT: returning exstat=%d\n", exstat));
3366 static int dowait(struct op *t)
3378 setstatus(waitfor(i, 1));
3382 static int doread(struct op *t)
3388 if (t->words[1] == NULL) {
3389 err("Usage: read name ...");
3392 for (wp = t->words + 1; *wp; wp++) {
3393 for (cp = global_env.linep; !nl && cp < elinep - 1; cp++) {
3394 nb = read(0, cp, sizeof(*cp));
3395 if (nb != sizeof(*cp))
3398 if (nl || (wp[1] && any(*cp, ifs->value)))
3404 setval(lookup(*wp), global_env.linep);
3409 static int doeval(struct op *t)
3411 return RUN(awordlist, t->words + 1, wdchar);
3414 static int dotrap(struct op *t)
3419 if (t->words[1] == NULL) {
3420 for (i = 0; i <= _NSIG; i++)
3429 resetsig = isdigit(*t->words[1]);
3430 for (i = resetsig ? 1 : 2; t->words[i] != NULL; ++i) {
3431 n = getsig(t->words[i]);
3435 if (*t->words[1] != '\0') {
3436 trap[n] = strsave(t->words[1], 0);
3445 setsig(n, n == SIGQUIT ? SIG_IGN : SIG_DFL);
3453 static int getsig(char *s)
3458 if (n < 0 || n > _NSIG) {
3459 err("trap: bad signal number");
3465 static void setsig(int n, sighandler_t f)
3469 if (signal(n, SIG_IGN) != SIG_IGN || ourtrap[n]) {
3475 static int getn(char *as)
3486 for (n = 0; isdigit(*s); s++)
3487 n = (n * 10) + (*s - '0');
3490 err(": bad number");
3495 static int dobreak(struct op *t)
3497 return brkcontin(t->words[1], 1);
3500 static int docontinue(struct op *t)
3502 return brkcontin(t->words[1], 0);
3505 static int brkcontin(char *cp, int val)
3510 nl = cp == NULL ? 1 : getn(cp);
3517 brklist = bc->nextlev;
3520 err("bad break/continue level");
3524 longjmp(bc->brkpt, 1);
3528 static int doexit(struct op *t)
3535 setstatus(getn(cp));
3537 DBGPRINTF(("DOEXIT: calling leave(), t=%p\n", t));
3544 static int doexport(struct op *t)
3546 rdexp(t->words + 1, export, EXPORT);
3550 static int doreadonly(struct op *t)
3552 rdexp(t->words + 1, ronly, RONLY);
3556 static void rdexp(char **wp, void (*f) (struct var *), int key)
3558 DBGPRINTF6(("RDEXP: enter, wp=%p, func=%p, key=%d\n", wp, f, key));
3559 DBGPRINTF6(("RDEXP: *wp=%s\n", *wp));
3562 for (; *wp != NULL; wp++) {
3563 if (isassign(*wp)) {
3567 for (cp = *wp; *cp != '='; cp++);
3579 static void badid(char *s)
3582 err(": bad identifier");
3585 static int doset(struct op *t)
3593 for (vp = vlist; vp; vp = vp->next)
3594 varput(vp->name, 1);
3598 /* bad: t->words++; */
3599 for (n = 0; (t->words[n] = t->words[n + 1]) != NULL; n++);
3601 FLAG['x'] = FLAG['v'] = 0;
3611 if (*cp >= 'a' && *cp <= 'z')
3620 t->words[0] = dolv[0];
3621 for (n = 1; t->words[n]; n++)
3622 setarea((char *) t->words[n], 0);
3625 setval(lookup("#"), putn(dolc));
3626 setarea((char *) (dolv - 1), 0);
3631 static void varput(char *s, int out)
3633 if (isalnum(*s) || *s == '_') {
3634 write(out, s, strlen(s));
3635 write(out, "\n", 1);
3641 * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
3642 * This file contains code for the times builtin.
3644 static int dotimes(struct op *t)
3647 long clk_tck = sysconf(_SC_CLK_TCK);
3650 printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
3651 (int) (buf.tms_utime / clk_tck / 60),
3652 ((double) buf.tms_utime) / clk_tck,
3653 (int) (buf.tms_stime / clk_tck / 60),
3654 ((double) buf.tms_stime) / clk_tck,
3655 (int) (buf.tms_cutime / clk_tck / 60),
3656 ((double) buf.tms_cutime) / clk_tck,
3657 (int) (buf.tms_cstime / clk_tck / 60),
3658 ((double) buf.tms_cstime) / clk_tck);
3663 /* -------- eval.c -------- */
3668 * blank interpretation
3673 static char **eval(char **ap, int f)
3681 /* Avoid longjmp clobbering */
3686 DBGPRINTF4(("EVAL: enter, f=%d\n", f));
3692 if (newenv(setjmp(errpt)) == 0) {
3693 while (*ap && isassign(*ap))
3694 expand(*ap++, &wb, f & ~DOGLOB);
3696 for (wf = ap; *wf; wf++) {
3698 expand(*wf, &wb, f & ~DOGLOB);
3701 for (wb = addword((char *) 0, wb); *ap; ap++) {
3702 if (!FLAG['k'] || !isassign(*ap))
3703 expand(*ap, &wb, f & ~DOKEY);
3705 wb = addword((char *) 0, wb);
3711 return gflg ? (char **) NULL : wp;
3716 * Make the exported environment from the exported
3717 * names in the dictionary. Keyword assignments
3718 * will already have been done.
3720 static char **makenv(int all, struct wdblock *wb)
3724 DBGPRINTF5(("MAKENV: enter, all=%d\n", all));
3726 for (vp = vlist; vp; vp = vp->next)
3727 if (all || vp->status & EXPORT)
3728 wb = addword(vp->name, wb);
3729 wb = addword((char *) 0, wb);
3730 return getwords(wb);
3733 static int expand(const char *cp, struct wdblock **wbp, int f)
3739 /* Avoid longjmp clobbering */
3743 DBGPRINTF3(("EXPAND: enter, f=%d\n", f));
3750 if (!anys("$`'\"", cp) && !anys(ifs->value, cp)
3751 && ((f & DOGLOB) == 0 || !anys("[*?", cp))
3753 xp = strsave(cp, areanum);
3756 *wbp = addword(xp, *wbp);
3760 if (newenv(setjmp(errpt)) == 0) {
3761 PUSHIO(aword, cp, strchar);
3762 global_env.iobase = global_env.iop;
3763 while ((xp = blank(f)) && gflg == 0) {
3764 global_env.linep = xp;
3765 xp = strsave(xp, areanum);
3766 if ((f & DOGLOB) == 0) {
3769 *wbp = addword(xp, *wbp);
3771 *wbp = glob(xp, *wbp);
3779 static char *evalstr(char *cp, int f)
3783 DBGPRINTF6(("EVALSTR: enter, cp=%p, f=%d\n", cp, f));
3786 if (expand(cp, &wb, f)) {
3787 if (wb == NULL || wb->w_nword == 0
3788 || (cp = wb->w_words[0]) == NULL
3790 // TODO: I suspect that
3791 // char *evalstr(char *cp, int f) is actually
3792 // const char *evalstr(const char *cp, int f)!
3803 * Blank interpretation and quoting
3805 static char *blank(int f)
3809 int scanequals, foundequals;
3811 DBGPRINTF3(("BLANK: enter, f=%d\n", f));
3813 sp = global_env.linep;
3814 scanequals = f & DOKEY;
3818 c = subgetc('"', foundequals);
3821 if (sp == global_env.linep)
3823 *global_env.linep++ = 0;
3827 if (f & DOBLANK && any(c, ifs->value))
3836 for (c1 = c; (c = subgetc(c1, 1)) != c1;) {
3839 if (c == '\'' || !any(c, "$`\""))
3841 *global_env.linep++ = c;
3846 if (!isalpha(c) && c != '_')
3849 c = subgetc('"', foundequals);
3851 f & (DOBLANK && any(c, ifs->value)) ||
3852 (!INSUB() && any(c, "\"'"))) {
3863 } else if (!isalnum(c) && c != '_')
3866 *global_env.linep++ = c;
3868 *global_env.linep++ = 0;
3873 * Get characters, substituting for ` and $
3875 static int subgetc(char ec, int quoted)
3879 DBGPRINTF3(("SUBGETC: enter, quoted=%d\n", quoted));
3883 if (!INSUB() && ec != '\'') {
3885 if (grave(quoted) == 0)
3887 global_env.iop->task = XGRAVE;
3893 global_env.iop->task = XDOLL;
3902 * Prepare to generate the string returned by ${} substitution.
3904 static int dollar(int quoted)
3909 char *s, c, *cp = NULL;
3912 DBGPRINTF3(("DOLLAR: enter, quoted=%d\n", quoted));
3915 s = global_env.linep;
3917 *global_env.linep++ = c;
3918 if (isalpha(c) || c == '_') {
3919 while ((c = readc()) != 0 && (isalnum(c) || c == '_'))
3920 if (global_env.linep < elinep)
3921 *global_env.linep++ = c;
3926 oiop = global_env.iop;
3927 otask = global_env.iop->task;
3929 global_env.iop->task = XOTHER;
3930 while ((c = subgetc('"', 0)) != 0 && c != '}' && c != '\n')
3931 if (global_env.linep < elinep)
3932 *global_env.linep++ = c;
3933 if (oiop == global_env.iop)
3934 global_env.iop->task = otask;
3941 if (global_env.linep >= elinep) {
3942 err("string in ${} too long");
3944 global_env.linep -= 10;
3946 *global_env.linep = 0;
3948 for (cp = s + 1; *cp; cp++)
3949 if (any(*cp, "=-+?")) {
3954 if (s[1] == 0 && (*s == '*' || *s == '@')) {
3956 /* currently this does not distinguish $* and $@ */
3957 /* should check dollar */
3958 global_env.linep = s;
3959 PUSHIO(awordlist, dolv + 1, dolchar);
3961 } else { /* trap the nasty ${=} */
3972 err("cannot use ${...=...} with $n");
3981 dolp = strsave(cp, areanum);
3986 prs("missing value for ");
3993 } else if (c == '+')
3994 dolp = strsave(cp, areanum);
3995 if (FLAG['u'] && dolp == null) {
3996 prs("unset variable: ");
4000 global_env.linep = s;
4001 PUSHIO(aword, dolp, quoted ? qstrchar : strchar);
4006 * Run the command in `...` and read its output.
4009 static int grave(int quoted)
4011 /* moved to G: static char child_cmd[LINELIM]; */
4022 char *argument_list[4];
4023 struct wdblock *wb = NULL;
4026 /* Avoid longjmp clobbering */
4030 for (cp = global_env.iop->argp->aword; *cp != '`'; cp++) {
4032 err("no closing `");
4037 /* string copy with dollar expansion */
4038 src = global_env.iop->argp->aword;
4043 while ((*src != '`') && (count < LINELIM)) {
4048 if (*src == '$' && !ignore && !ignore_once) {
4050 /* moved to G to reduce stack usage
4051 char var_name[LINELIM];
4052 char alt_value[LINELIM];
4054 #define var_name (G.grave__var_name)
4055 #define alt_value (G.grave__alt_value)
4068 var_name[var_index++] = *src++;
4069 while (isalnum(*src) || *src=='_')
4070 var_name[var_index++] = *src++;
4071 var_name[var_index] = 0;
4084 err("unclosed ${\n");
4089 while (*src && (*src != '}')) {
4090 alt_value[alt_index++] = *src++;
4092 alt_value[alt_index] = 0;
4094 err("unclosed ${\n");
4101 if (isalpha(*var_name)) {
4102 /* let subshell handle it instead */
4104 char *namep = var_name;
4112 char *altp = alt_value;
4120 wb = addword(lookup(var_name)->name, wb);
4124 vp = lookup(var_name);
4125 if (vp->value != null)
4126 value = (operator == '+') ?
4127 alt_value : vp->value;
4128 else if (operator == '?') {
4131 } else if (alt_index && (operator != '+')) {
4133 if (operator == '=')
4138 while (*value && (count < LINELIM)) {
4153 if (openpipe(pf) < 0)
4156 while ((i = vfork()) == -1 && errno == EAGAIN);
4158 DBGPRINTF3(("GRAVE: i is %p\n", io));
4162 err((char *) bb_msg_memory_exhausted);
4166 waitpid(i, NULL, 0); // safe_waitpid?
4167 global_env.iop->argp->aword = ++cp;
4169 PUSHIO(afile, remap(pf[0]),
4170 (int (*)(struct ioarg *)) ((quoted) ? qgravechar : gravechar));
4173 /* allow trapped signals */
4174 /* XXX - Maybe this signal stuff should go as well? */
4175 for (j = 0; j <= _NSIG; j++)
4176 if (ourtrap[j] && signal(j, SIG_IGN) != SIG_IGN)
4179 /* Testcase where below checks are needed:
4180 * close stdout & run this script:
4188 argument_list[0] = (char *) DEFAULT_SHELL;
4189 argument_list[1] = (char *) "-c";
4190 argument_list[2] = child_cmd;
4191 argument_list[3] = NULL;
4193 cp = rexecve(argument_list[0], argument_list, makenv(1, wb));
4194 prs(argument_list[0]);
4201 static char *unquote(char *as)
4212 /* -------- glob.c -------- */
4218 #define scopy(x) strsave((x), areanum)
4220 #define NDENT ((BLKSIZ+sizeof(struct dirent)-1)/sizeof(struct dirent))
4222 static struct wdblock *cl, *nl;
4223 static const char spcl[] ALIGN1= "[?*";
4225 static struct wdblock *glob(char *cp, struct wdblock *wb)
4233 for (pp = cp; *pp; pp++)
4236 else if (!any(*pp & ~QUOTE, spcl))
4239 for (cl = addword(scopy(cp), NULL); anyspcl(cl); cl = nl) {
4240 nl = newword(cl->w_nword * 2);
4241 for (i = 0; i < cl->w_nword; i++) { /* for each argument */
4242 for (pp = cl->w_words[i]; *pp; pp++)
4243 if (any(*pp, spcl)) {
4244 globname(cl->w_words[i], pp);
4248 nl = addword(scopy(cl->w_words[i]), nl);
4250 for (i = 0; i < cl->w_nword; i++)
4251 DELETE(cl->w_words[i]);
4254 for (i = 0; i < cl->w_nword; i++)
4255 unquote(cl->w_words[i]);
4256 glob0((char *) cl->w_words, cl->w_nword, sizeof(char *), xstrcmp);
4258 for (i = 0; i < cl->w_nword; i++)
4259 wb = addword(cl->w_words[i], wb);
4264 wb = addword(unquote(cp), wb);
4268 static void globname(char *we, char *pp)
4271 char *name, *gp, *dp;
4275 char dname[NAME_MAX + 1];
4278 for (np = we; np != pp; pp--)
4281 for (dp = cp = space((int) (pp - np) + 3); np < pp;)
4285 for (gp = cp = space(strlen(pp) + 1); *np && *np != '/';)
4294 dname[NAME_MAX] = '\0';
4295 while ((de = readdir(dirp)) != NULL) {
4296 /* XXX Hmmm... What this could be? (abial) */
4298 if (ent[j].d_ino == 0)
4301 strncpy(dname, de->d_name, NAME_MAX);
4302 if (dname[0] == '.')
4305 for (k = 0; k < NAME_MAX; k++)
4306 if (any(dname[k], spcl))
4308 if (gmatch(dname, gp)) {
4309 name = generate(we, pp, dname, np);
4310 if (*np && !anys(np, spcl)) {
4311 if (stat(name, &dbuf)) {
4316 nl = addword(name, nl);
4325 * generate a pathname as below.
4326 * start..end1 / middle end
4327 * the slashes come for free
4329 static char *generate(char *start1, char *end1, char *middle, char *end)
4334 p = op = space((int)(end1 - start1) + strlen(middle) + strlen(end) + 2);
4335 for (xp = start1; xp != end1;)
4337 for (xp = middle; (*op++ = *xp++) != '\0';);
4339 for (xp = end; (*op++ = *xp++) != '\0';);
4343 static int anyspcl(struct wdblock *wb)
4349 for (i = 0; i < wb->w_nword; i++)
4350 if (anys(spcl, *wd++))
4355 static int xstrcmp(char *p1, char *p2)
4357 return strcmp(*(char **) p1, *(char **) p2);
4361 /* -------- word.c -------- */
4363 static struct wdblock *newword(int nw)
4367 wb = (struct wdblock *) space(sizeof(*wb) + nw * sizeof(char *));
4373 static struct wdblock *addword(char *wd, struct wdblock *wb)
4375 struct wdblock *wb2;
4379 wb = newword(NSTART);
4381 if (nw >= wb->w_bsize) {
4382 wb2 = newword(nw * 2);
4383 memcpy((char *) wb2->w_words, (char *) wb->w_words,
4384 nw * sizeof(char *));
4389 wb->w_words[wb->w_nword++] = wd;
4393 static char **getwords(struct wdblock *wb)
4400 if (wb->w_nword == 0) {
4404 wd = (char **) space(nb = sizeof(*wd) * wb->w_nword);
4405 memcpy((char *) wd, (char *) wb->w_words, nb);
4406 DELETE(wb); /* perhaps should done by caller */
4410 static int (*func) (char *, char *);
4413 static void glob3(char *i, char *j, char *k)
4415 char *index1, *index2, *index3;
4425 *index1++ = *index3;
4426 *index3++ = *index2;
4431 static void glob2(char *i, char *j)
4433 char *index1, *index2, c;
4441 *index1++ = *index2;
4446 static void glob1(char *base, char *lim)
4457 n = (int) (lim - base);
4460 n = v2 * (n / (2 * v2));
4461 hptr = lptr = base + n;
4466 c = (*func) (i, lptr);
4480 c = (*func) (hptr, j);
4504 if (lptr - base >= lim - hptr) {
4505 glob1(hptr + v2, lim);
4520 static void glob0(char *a0, unsigned a1, int a2, int (*a3) (char *, char *))
4524 glob1(a0, a0 + a1 * a2);
4528 /* -------- io.c -------- */
4534 static int my_getc(int ec)
4538 if (global_env.linep > elinep) {
4539 while ((c = readc()) != '\n' && c);
4540 err("input line too long");
4545 if ((ec != '\'') && (ec != '`') && (global_env.iop->task != XGRAVE)) {
4548 if (c == '\n' && ec != '\"')
4556 static void unget(int c)
4558 if (global_env.iop >= global_env.iobase)
4559 global_env.iop->peekc = c;
4562 static int eofc(void)
4564 return global_env.iop < global_env.iobase || (global_env.iop->peekc == 0 && global_env.iop->prev == 0);
4567 static int readc(void)
4571 RCPRINTF(("READC: global_env.iop %p, global_env.iobase %p\n", global_env.iop, global_env.iobase));
4573 for (; global_env.iop >= global_env.iobase; global_env.iop--) {
4574 RCPRINTF(("READC: global_env.iop %p, peekc 0x%x\n", global_env.iop, global_env.iop->peekc));
4575 c = global_env.iop->peekc;
4577 global_env.iop->peekc = 0;
4580 if (global_env.iop->prev != 0) {
4581 c = (*global_env.iop->iofn)(global_env.iop->argp, global_env.iop);
4587 if (global_env.iop == iostack)
4589 global_env.iop->prev = c;
4590 return global_env.iop->prev;
4592 if (global_env.iop->task == XIO && global_env.iop->prev != '\n') {
4593 global_env.iop->prev = 0;
4594 if (global_env.iop == iostack)
4599 if (global_env.iop->task == XIO) {
4601 global_env.iop->prev = 0;
4602 return global_env.iop->prev;
4604 if (interactive && global_env.iop == iostack + 1) {
4605 #if ENABLE_FEATURE_EDITING
4606 current_prompt = prompt->value;
4614 if (global_env.iop >= iostack) {
4615 RCPRINTF(("READC: return 0, global_env.iop %p\n", global_env.iop));
4619 DBGPRINTF(("READC: leave()...\n"));
4626 static void ioecho(char c)
4629 write(2, &c, sizeof c);
4633 static void pushio(struct ioarg *argp, int (*fn) (struct ioarg *))
4635 DBGPRINTF(("PUSHIO: argp %p, argp->afid 0x%x, global_env.iop %p\n", argp,
4636 argp->afid, global_env.iop));
4638 /* Set env ptr for io source to next array spot and check for array overflow */
4639 if (++global_env.iop >= &iostack[NPUSH]) {
4641 err("Shell input nested too deeply");
4646 /* We did not overflow the NPUSH array spots so setup data structs */
4648 global_env.iop->iofn = (int (*)(struct ioarg *, struct io *)) fn; /* Store data source func ptr */
4650 if (argp->afid != AFID_NOBUF)
4651 global_env.iop->argp = argp;
4654 global_env.iop->argp = ioargstack + (global_env.iop - iostack); /* MAL - index into stack */
4655 *global_env.iop->argp = *argp; /* copy data from temp area into stack spot */
4657 /* MAL - mainbuf is for 1st data source (command line?) and all nested use a single shared buffer? */
4659 if (global_env.iop == &iostack[0])
4660 global_env.iop->argp->afbuf = &mainbuf;
4662 global_env.iop->argp->afbuf = &sharedbuf;
4664 /* MAL - if not a termimal AND (commandline OR readable file) then give it a buffer id? */
4665 /* This line appears to be active when running scripts from command line */
4666 if ((isatty(global_env.iop->argp->afile) == 0)
4667 && (global_env.iop == &iostack[0]
4668 || lseek(global_env.iop->argp->afile, 0L, SEEK_CUR) != -1)) {
4669 if (++bufid == AFID_NOBUF) /* counter rollover check, AFID_NOBUF = 11111111 */
4670 bufid = AFID_ID; /* AFID_ID = 0 */
4672 global_env.iop->argp->afid = bufid; /* assign buffer id */
4675 DBGPRINTF(("PUSHIO: iostack %p, global_env.iop %p, afbuf %p\n",
4676 iostack, global_env.iop, global_env.iop->argp->afbuf));
4677 DBGPRINTF(("PUSHIO: mbuf %p, sbuf %p, bid %d, global_env.iop %p\n",
4678 &mainbuf, &sharedbuf, bufid, global_env.iop));
4682 global_env.iop->prev = ~'\n';
4683 global_env.iop->peekc = 0;
4684 global_env.iop->xchar = 0;
4685 global_env.iop->nlcount = 0;
4687 if (fn == filechar || fn == linechar)
4688 global_env.iop->task = XIO;
4689 else if (fn == (int (*)(struct ioarg *)) gravechar
4690 || fn == (int (*)(struct ioarg *)) qgravechar)
4691 global_env.iop->task = XGRAVE;
4693 global_env.iop->task = XOTHER;
4696 static struct io *setbase(struct io *ip)
4700 xp = global_env.iobase;
4701 global_env.iobase = ip;
4706 * Input generating functions
4710 * Produce the characters of a string, then a newline, then EOF.
4712 static int nlchar(struct ioarg *ap)
4716 if (ap->aword == NULL)
4727 * Given a list of words, produce the characters
4728 * in them, with a space after each word.
4730 static int wdchar(struct ioarg *ap)
4745 ap->awordlist = NULL;
4750 * Return the characters of a list of words,
4751 * producing a space between them.
4753 static int dolchar(struct ioarg *ap)
4757 wp = *ap->awordlist++;
4759 PUSHIO(aword, wp, *ap->awordlist == NULL ? strchar : xxchar);
4765 static int xxchar(struct ioarg *ap)
4769 if (ap->aword == NULL)
4780 * Produce the characters from a single word (string).
4782 static int strchar(struct ioarg *ap)
4784 if (ap->aword == NULL)
4786 return *ap->aword++;
4790 * Produce quoted characters from a single word (string).
4792 static int qstrchar(struct ioarg *ap)
4796 if (ap->aword == NULL)
4805 * Return the characters from a file.
4807 static int filechar(struct ioarg *ap)
4811 struct iobuf *bp = ap->afbuf;
4813 if (ap->afid != AFID_NOBUF) {
4814 i = (ap->afid != bp->id);
4815 if (i || bp->bufp == bp->ebufp) {
4817 lseek(ap->afile, ap->afpos, SEEK_SET);
4819 i = safe_read(ap->afile, bp->buf, sizeof(bp->buf));
4827 bp->ebufp = bp->bufp + i;
4831 return *bp->bufp++ & 0177;
4833 #if ENABLE_FEATURE_EDITING
4834 if (interactive && isatty(ap->afile)) {
4835 /* moved to G: static char filechar_cmdbuf[BUFSIZ]; */
4836 static int position = 0, size = 0;
4838 while (size == 0 || position >= size) {
4839 read_line_input(current_prompt, filechar_cmdbuf, BUFSIZ, line_input_state);
4840 size = strlen(filechar_cmdbuf);
4843 c = filechar_cmdbuf[position];
4848 i = safe_read(ap->afile, &c, sizeof(c));
4849 return i == sizeof(c) ? (c & 0x7f) : (closef(ap->afile), 0);
4853 * Return the characters from a here temp file.
4855 static int herechar(struct ioarg *ap)
4859 if (read(ap->afile, &c, sizeof(c)) != sizeof(c)) {
4867 * Return the characters produced by a process (`...`).
4868 * Quote them if required, and remove any trailing newline characters.
4870 static int gravechar(struct ioarg *ap, struct io *iop)
4874 c = qgravechar(ap, iop) & ~QUOTE;
4880 static int qgravechar(struct ioarg *ap, struct io *iop)
4884 DBGPRINTF3(("QGRAVECHAR: enter, ap=%p, iop=%p\n", ap, iop));
4889 return '\n' | QUOTE;
4893 } else if ((c = filechar(ap)) == '\n') {
4895 while ((c = filechar(ap)) == '\n')
4903 return c != 0 ? c | QUOTE : 0;
4907 * Return a single command (usually the first line) from a file.
4909 static int linechar(struct ioarg *ap)
4917 ap->afile = -1; /* illegal value */
4924 * remap fd into Shell's fd space
4926 static int remap(int fd)
4932 DBGPRINTF(("REMAP: fd=%d, global_env.iofd=%d\n", fd, global_env.iofd));
4934 if (fd < global_env.iofd) {
4935 for (i = 0; i < NOFILE; i++)
4942 } while (fd >= 0 && fd < global_env.iofd);
4944 for (i = 0; i < NOFILE; i++)
4949 err("too many files open in shell");
4955 static int openpipe(int *pv)
4961 err("can't create pipe - try again");
4965 static void closepipe(int *pv)
4974 /* -------- here.c -------- */
4980 static void markhere(char *s, struct ioword *iop)
4982 struct here *h, *lh;
4984 DBGPRINTF7(("MARKHERE: enter, s=%p\n", s));
4986 h = (struct here *) space(sizeof(struct here));
4990 h->h_tag = evalstr(s, DOSUB);
5000 for (lh = inhere; lh != NULL; lh = lh->h_next) {
5001 if (lh->h_next == 0) {
5007 iop->io_flag |= IOHERE | IOXHERE;
5008 for (s = h->h_tag; *s; s++) {
5010 iop->io_flag &= ~IOXHERE;
5014 h->h_dosub = iop->io_flag & IOXHERE;
5017 static void gethere(void)
5019 struct here *h, *hp;
5021 DBGPRINTF7(("GETHERE: enter...\n"));
5023 /* Scan here files first leaving inhere list in place */
5024 for (hp = h = inhere; h != NULL; hp = h, h = h->h_next)
5025 readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub ? 0 : '\'');
5027 /* Make inhere list active - keep list intact for scraphere */
5029 hp->h_next = acthere;
5035 static void readhere(char **name, char *s, int ec)
5038 char tname[30] = ".msh_XXXXXX";
5041 char myline[LINELIM + 1];
5044 DBGPRINTF7(("READHERE: enter, name=%p, s=%p\n", name, s));
5046 tf = mkstemp(tname);
5050 *name = strsave(tname, areanum);
5052 if (newenv(setjmp(errpt)) != 0)
5055 pushio(global_env.iop->argp, (int (*)(struct ioarg *)) global_env.iop->iofn);
5056 global_env.iobase = global_env.iop;
5058 if (interactive && global_env.iop <= iostack) {
5059 #if ENABLE_FEATURE_EDITING
5060 current_prompt = cprompt->value;
5062 prs(cprompt->value);
5066 while ((c = my_getc(ec)) != '\n' && c) {
5069 if (thenext >= &myline[LINELIM]) {
5076 if (strcmp(s, myline) == 0 || c == 0)
5079 write(tf, myline, (int) (thenext - myline));
5082 prs("here document `");
5092 * open here temp file.
5093 * if unquoted here, expand here temp file into second temp file.
5095 static int herein(char *hname, int xdoll)
5101 /* Avoid longjmp clobbering */
5107 DBGPRINTF7(("HEREIN: hname is %s, xdoll=%d\n", hname, xdoll));
5109 hf = open(hname, O_RDONLY);
5115 char tname[30] = ".msh_XXXXXX";
5118 tf = mkstemp(tname);
5122 if (newenv(setjmp(errpt)) == 0) {
5123 PUSHIO(afile, hf, herechar);
5124 setbase(global_env.iop);
5125 while ((c = subgetc(0, 0)) != 0) {
5127 write(tf, &c, sizeof c);
5133 tf = open(tname, O_RDONLY);
5140 static void scraphere(void)
5144 DBGPRINTF7(("SCRAPHERE: enter...\n"));
5146 for (h = inhere; h != NULL; h = h->h_next) {
5147 if (h->h_iop && h->h_iop->io_name)
5148 unlink(h->h_iop->io_name);
5153 /* unlink here temp files before a freearea(area) */
5154 static void freehere(int area)
5156 struct here *h, *hl;
5158 DBGPRINTF6(("FREEHERE: enter, area=%d\n", area));
5161 for (h = acthere; h != NULL; h = h->h_next)
5162 if (getarea((char *) h) >= area) {
5163 if (h->h_iop->io_name != NULL)
5164 unlink(h->h_iop->io_name);
5166 acthere = h->h_next;
5168 hl->h_next = h->h_next;
5174 /* -------- sh.c -------- */
5179 int msh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
5180 int msh_main(int argc, char **argv)
5186 int (*iof) (struct ioarg *);
5190 sharedbuf.id = AFID_NOBUF;
5191 mainbuf.id = AFID_NOBUF;
5192 elinep = line + sizeof(line) - 5;
5194 #if ENABLE_FEATURE_EDITING
5195 line_input_state = new_line_input_t(FOR_SHELL);
5198 DBGPRINTF(("MSH_MAIN: argc %d, environ %p\n", argc, environ));
5204 assign(*ap++, !COPYV);
5205 for (ap = environ; *ap;)
5206 export(lookup(*ap++));
5211 shell = lookup("SHELL");
5212 if (shell->value == null)
5213 setval(shell, (char *)DEFAULT_SHELL);
5216 homedir = lookup("HOME");
5217 if (homedir->value == null)
5218 setval(homedir, "/");
5221 setval(lookup("$"), putn(getpid()));
5223 path = lookup("PATH");
5224 if (path->value == null) {
5225 /* Can be merged with same string elsewhere in bbox */
5227 setval(path, bb_default_root_path);
5229 setval(path, bb_default_path);
5233 ifs = lookup("IFS");
5234 if (ifs->value == null)
5235 setval(ifs, " \t\n");
5238 mshdbg_var = lookup("MSHDEBUG");
5239 if (mshdbg_var->value == null)
5240 setval(mshdbg_var, "0");
5243 prompt = lookup("PS1");
5244 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
5245 if (prompt->value == null)
5247 setval(prompt, DEFAULT_USER_PROMPT);
5248 if (geteuid() == 0) {
5249 setval(prompt, DEFAULT_ROOT_PROMPT);
5250 prompt->status &= ~EXPORT;
5252 cprompt = lookup("PS2");
5253 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
5254 if (cprompt->value == null)
5256 setval(cprompt, "> ");
5262 if (argv[0][0] == '-' && argv[0][1] != '\0') {
5263 for (s = argv[0] + 1; *s; s++)
5266 prompt->status &= ~EXPORT;
5267 cprompt->status &= ~EXPORT;
5269 setval(cprompt, "");
5272 PUSHIO(aword, *++argv, iof = nlchar);
5280 /* standard input */
5284 prompt->status &= ~EXPORT;
5292 if (*s >= 'a' && *s <= 'z')
5300 if (iof == filechar && --argc > 0) {
5302 setval(cprompt, "");
5303 prompt->status &= ~EXPORT;
5304 cprompt->status &= ~EXPORT;
5306 /* Shell is non-interactive, activate printf-based debug */
5308 mshdbg = (int) (((char) (mshdbg_var->value[0])) - '0');
5312 DBGPRINTF(("MSH_MAIN: calling newfile()\n"));
5316 exit(1); /* Exit on error */
5322 /* This won't be true if PUSHIO has been called, say from newfile() above */
5323 if (global_env.iop < iostack) {
5324 PUSHIO(afile, 0, iof);
5325 if (isatty(0) && isatty(1) && !cflag) {
5327 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
5329 printf("\n\n%s built-in shell (msh with debug)\n", bb_banner);
5331 printf("\n\n%s built-in shell (msh)\n", bb_banner);
5333 printf("Enter 'help' for a list of built-in commands.\n\n");
5338 signal(SIGQUIT, qflag);
5339 if (name && name[0] == '-') {
5341 f = open(".profile", O_RDONLY);
5344 f = open("/etc/profile", O_RDONLY);
5349 signal(SIGTERM, sig);
5351 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
5352 signal(SIGINT, onintr);
5357 for (ap = ++argv; --argc > 0;) {
5359 if (assign(*ap, !COPYV)) {
5360 dolc--; /* keyword */
5366 setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc));
5368 DBGPRINTF(("MSH_MAIN: begin FOR loop, interactive %d, global_env.iop %p, iostack %p\n", interactive, global_env.iop, iostack));
5371 if (interactive && global_env.iop <= iostack) {
5372 #if ENABLE_FEATURE_EDITING
5373 current_prompt = prompt->value;
5379 /* Ensure that getenv("PATH") stays current */
5380 setenv("PATH", path->value, 1);
5383 DBGPRINTF(("MSH_MAIN: returning.\n"));
5388 * Copyright (c) 1987,1997, Prentice Hall
5389 * All rights reserved.
5391 * Redistribution and use of the MINIX operating system in source and
5392 * binary forms, with or without modification, are permitted provided
5393 * that the following conditions are met:
5395 * Redistributions of source code must retain the above copyright
5396 * notice, this list of conditions and the following disclaimer.
5398 * Redistributions in binary form must reproduce the above
5399 * copyright notice, this list of conditions and the following
5400 * disclaimer in the documentation and/or other materials provided
5401 * with the distribution.
5403 * Neither the name of Prentice Hall nor the names of the software
5404 * authors or contributors may be used to endorse or promote
5405 * products derived from this software without specific prior
5406 * written permission.
5408 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND
5409 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
5410 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
5411 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
5412 * IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE
5413 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
5414 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
5415 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
5416 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
5417 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
5418 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
5419 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.