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 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 * Original copyright notice is retained at the end of this file.
45 #include <sys/times.h>
46 #include <sys/types.h>
52 /* Conditional use of "register" keyword */
53 #define REGISTER register
56 /*#define MSHDEBUG 1*/
61 #define DBGPRINTF(x) if(mshdbg>0)printf x
62 #define DBGPRINTF0(x) if(mshdbg>0)printf x
63 #define DBGPRINTF1(x) if(mshdbg>1)printf x
64 #define DBGPRINTF2(x) if(mshdbg>2)printf x
65 #define DBGPRINTF3(x) if(mshdbg>3)printf x
66 #define DBGPRINTF4(x) if(mshdbg>4)printf x
67 #define DBGPRINTF5(x) if(mshdbg>5)printf x
68 #define DBGPRINTF6(x) if(mshdbg>6)printf x
69 #define DBGPRINTF7(x) if(mshdbg>7)printf x
70 #define DBGPRINTF8(x) if(mshdbg>8)printf x
71 #define DBGPRINTF9(x) if(mshdbg>9)printf x
75 #define RCPRINTF(x) if(mshdbg_rc)printf x
96 #ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
97 # define DEFAULT_ROOT_PROMPT "\\u:\\w> "
98 # define DEFAULT_USER_PROMPT "\\u:\\w$ "
100 # define DEFAULT_ROOT_PROMPT "# "
101 # define DEFAULT_USER_PROMPT "$ "
105 /* -------- sh.h -------- */
111 #define NPUSH 8 /* limit to input nesting */
114 #define NOFILE 20 /* Number of open files */
115 #define NUFILE 10 /* Number of user-accessible files */
116 #define FDBASE 10 /* First file usable by Shell */
119 * values returned by wait
121 #define WAITSIG(s) ((s)&0177)
122 #define WAITVAL(s) (((s)>>8)&0377)
123 #define WAITCORE(s) (((s)&0200)!=0)
126 * library and system definitions
128 typedef void xint; /* base type of jmp_buf, for not broken compilers */
136 #define NOBLOCK ((struct op *)NULL)
137 #define NOWORD ((char *)NULL)
138 #define NOWORDS ((char **)NULL)
139 #define NOPIPE ((int *)NULL)
142 * Description of a command or an operation on commands.
143 * Might eventually use a union.
146 int type; /* operation type, see below */
147 char **words; /* arguments to a command */
148 struct ioword **ioact; /* IO actions (eg, < > >>) */
151 char *str; /* identifier for case and for */
154 #define TCOM 1 /* command */
155 #define TPAREN 2 /* (c-list) */
156 #define TPIPE 3 /* a | b */
157 #define TLIST 4 /* a [&;] b */
158 #define TOR 5 /* || */
159 #define TAND 6 /* && */
167 #define TPAT 14 /* pattern in case */
168 #define TBRACE 15 /* {c-list} */
169 #define TASYNC 16 /* c & */
170 /* Added to support "." file expansion */
173 /* Strings for names to make debug easier */
175 static char *T_CMD_NAMES[] = {
198 * actions determining the environment of a process
200 #define BIT(i) (1<<(i))
201 #define FEXEC BIT(0) /* execute without forking */
203 #if 0 /* Original value */
204 #define AREASIZE (65000)
206 #define AREASIZE (90000)
210 * flags to control evaluation of words
212 #define DOSUB 1 /* interpret $, `, and quotes */
213 #define DOBLANK 2 /* perform blank interpretation */
214 #define DOGLOB 4 /* interpret [?* */
215 #define DOKEY 8 /* move words with `=' to 2nd arg. list */
216 #define DOTRIM 16 /* trim resulting string */
218 #define DOALL (DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM)
222 static int newfile(char *s);
223 static char *findeq(char *cp);
224 static char *cclass(char *p, int sub);
225 static void initarea(void);
226 extern int msh_main(int argc, char **argv);
231 struct brkcon *nextlev;
239 short io_unit; /* unit affected */
240 short io_flag; /* action (below) */
241 char *io_name; /* file name */
244 #define IOREAD 1 /* < */
245 #define IOHERE 2 /* << (here file) */
246 #define IOWRITE 4 /* > */
247 #define IOCAT 8 /* >> */
248 #define IOXHERE 16 /* ${}, ` in << */
249 #define IODUP 32 /* >&digit */
250 #define IOCLOSE 64 /* >&- */
252 #define IODEFAULT (-1) /* token for default IO unit */
257 * parsing & execution environment
263 xint *errpt; /* void * */
271 * -k: look for name=value everywhere on command line
273 * -t: exit after reading and executing one command
276 * -u: unset variables net diagnostic
280 static char *null; /* null value for variable */
281 static int intr; /* interrupt pending */
283 static char *trap[_NSIG + 1];
284 static char ourtrap[_NSIG + 1];
285 static int trapset; /* trap pending */
287 static int heedint; /* heed interrupt signals */
289 static int yynerrs; /* yacc */
291 static char line[LINELIM];
298 static int (*inbuilt(char *s)) (struct op *);
300 static char *rexecve(char *c, char **v, char **envp);
301 static char *space(int n);
302 static char *strsave(char *s, int a);
303 static char *evalstr(char *cp, int f);
304 static char *putn(int n);
305 static char *itoa(int n);
306 static char *unquote(char *as);
307 static struct var *lookup(char *n);
308 static int rlookup(char *n);
309 static struct wdblock *glob(char *cp, struct wdblock *wb);
310 static int my_getc(int ec);
311 static int subgetc(int ec, int quoted);
312 static char **makenv(int all, struct wdblock *wb);
313 static char **eval(char **ap, int f);
314 static int setstatus(int s);
315 static int waitfor(int lastpid, int canintr);
317 static void onintr(int s); /* SIGINT handler */
319 static int newenv(int f);
320 static void quitenv(void);
321 static void err(char *s);
322 static int anys(char *s1, char *s2);
323 static int any(int c, char *s);
324 static void next(int f);
325 static void setdash(void);
326 static void onecommand(void);
327 static void runtrap(int i);
328 static int gmatch(char *s, char *p);
334 static void leave(void); /* abort shell (or fail in subshell) */
335 static void fail(void); /* fail but return to process next command */
336 static void warn(char *s);
337 static void sig(int i); /* default signal handler */
341 /* -------- area stuff -------- */
343 #define REGSIZE sizeof(struct region)
345 /* #define SHRINKBY (64) */
349 #define ALIGN (sizeof(int)-1)
359 /* -------- grammar stuff -------- */
384 /* Added for "." file expansion */
387 #define YYERRCODE 300
390 #define CONTIN 01 /* skip new lines to complete command */
392 #define SYNTAXERR zzerr()
394 static struct op *pipeline(int cf);
395 static struct op *andor(void);
396 static struct op *c_list(void);
397 static int synio(int cf);
398 static void musthave(int c, int cf);
399 static struct op *simple(void);
400 static struct op *nested(int type, int mark);
401 static struct op *command(int cf);
402 static struct op *dogroup(int onlydone);
403 static struct op *thenpart(void);
404 static struct op *elsepart(void);
405 static struct op *caselist(void);
406 static struct op *casepart(void);
407 static char **pattern(void);
408 static char **wordlist(void);
409 static struct op *list(struct op *t1, struct op *t2);
410 static struct op *block(int type, struct op *t1, struct op *t2, char **wp);
411 static struct op *newtp(void);
412 static struct op *namelist(struct op *t);
413 static char **copyw(void);
414 static void word(char *cp);
415 static struct ioword **copyio(void);
416 static struct ioword *io(int u, int f, char *cp);
417 static void zzerr(void);
418 static void yyerror(char *s);
419 static int yylex(int cf);
420 static int collect(int c, int c1);
421 static int dual(int c);
422 static void diag(int ec);
423 static char *tree(unsigned size);
425 /* -------- var.h -------- */
434 #define COPYV 1 /* flag to setval, suggesting copy */
435 #define RONLY 01 /* variable is read-only */
436 #define EXPORT 02 /* variable is to be exported */
437 #define GETCELL 04 /* name & value space was got with getcell */
439 static int yyparse(void);
440 static struct var *lookup(char *n);
441 static void setval(struct var *vp, char *val);
442 static void nameval(struct var *vp, char *val, char *name);
443 static void export(struct var *vp);
444 static void ronly(struct var *vp);
445 static int isassign(char *s);
446 static int checkname(char *cp);
447 static int assign(char *s, int cf);
448 static void putvlist(int f, int out);
449 static int eqname(char *n1, char *n2);
451 static int execute(struct op *t, int *pin, int *pout, int act);
454 /* -------- io.h -------- */
457 unsigned id; /* buffer id */
458 char buf[512]; /* buffer */
459 char *bufp; /* pointer into buffer */
460 char *ebufp; /* pointer to end of buffer */
463 /* possible arguments to an IO function */
467 int afile; /* file descriptor */
468 unsigned afid; /* buffer id */
469 long afpos; /* file position */
470 struct iobuf *afbuf; /* buffer for this file */
473 //static struct ioarg ioargstack[NPUSH];
474 #define AFID_NOBUF (~0)
477 /* an input generator's state */
479 int (*iofn) (struct ioarg *, struct io *);
482 char prev; /* previous character read by readc() */
483 char nlcount; /* for `'s */
484 char xchar; /* for `'s */
485 char task; /* reason for pushed IO */
488 //static struct io iostack[NPUSH];
489 #define XOTHER 0 /* none of the below */
490 #define XDOLL 1 /* expanding ${} */
491 #define XGRAVE 2 /* expanding `'s */
492 #define XIO 3 /* file IO */
494 /* in substitution */
495 #define INSUB() (e.iop->task == XGRAVE || e.iop->task == XDOLL)
499 * input generators for IO structure
501 static int nlchar(struct ioarg *ap);
502 static int strchar(struct ioarg *ap);
503 static int qstrchar(struct ioarg *ap);
504 static int filechar(struct ioarg *ap);
505 static int herechar(struct ioarg *ap);
506 static int linechar(struct ioarg *ap);
507 static int gravechar(struct ioarg *ap, struct io *iop);
508 static int qgravechar(struct ioarg *ap, struct io *iop);
509 static int dolchar(struct ioarg *ap);
510 static int wdchar(struct ioarg *ap);
511 static void scraphere(void);
512 static void freehere(int area);
513 static void gethere(void);
514 static void markhere(char *s, struct ioword *iop);
515 static int herein(char *hname, int xdoll);
516 static int run(struct ioarg *argp, int (*f) (struct ioarg *));
522 static int eofc(void);
523 static int readc(void);
524 static void unget(int c);
525 static void ioecho(int c);
526 static void prs(const char *s);
527 static void prn(unsigned u);
528 static void closef(int i);
529 static void closeall(void);
535 static void pushio(struct ioarg *argp, int (*f) (struct ioarg *));
536 static int remap(int fd);
537 static int openpipe(int *pv);
538 static void closepipe(int *pv);
539 static struct io *setbase(struct io *ip);
541 #define PUSHIO(what,arg,gen) ((temparg.what = (arg)),pushio(&temparg,(gen)))
542 #define RUN(what,arg,gen) ((temparg.what = (arg)), run(&temparg,(gen)))
544 /* -------- word.h -------- */
546 #define NSTART 16 /* default number of words to allow for initially */
551 /* bounds are arbitrary */
555 static struct wdblock *addword(char *wd, struct wdblock *wb);
556 static struct wdblock *newword(int nw);
557 static char **getwords(struct wdblock *wb);
559 /* -------- area.h -------- */
564 static char *getcell(unsigned nbytes);
565 static void garbage(void);
566 static void setarea(char *cp, int a);
567 static int getarea(char *cp);
568 static void freearea(int a);
569 static void freecell(char *cp);
570 static int areanum; /* current allocation area */
572 #define NEW(type) (type *)getcell(sizeof(type))
573 #define DELETE(obj) freecell((char *)obj)
576 /* -------- misc stuff -------- */
578 static int forkexec(struct op *t, int *pin, int *pout, int act, char **wp);
579 static int iosetup(struct ioword *iop, int pipein, int pipeout);
580 static void echo(char **wp);
581 static struct op **find1case(struct op *t, char *w);
582 static struct op *findcase(struct op *t, char *w);
583 static void brkset(struct brkcon *bc);
584 static int dolabel(struct op *t);
585 static int dohelp(struct op *t);
586 static int dochdir(struct op *t);
587 static int doshift(struct op *t);
588 static int dologin(struct op *t);
589 static int doumask(struct op *t);
590 static int doexec(struct op *t);
591 static int dodot(struct op *t);
592 static int dowait(struct op *t);
593 static int doread(struct op *t);
594 static int doeval(struct op *t);
595 static int dotrap(struct op *t);
596 static int getsig(char *s);
597 static void setsig(int n, sighandler_t f);
598 static int getn(char *as);
599 static int dobreak(struct op *t);
600 static int docontinue(struct op *t);
601 static int brkcontin(char *cp, int val);
602 static int doexit(struct op *t);
603 static int doexport(struct op *t);
604 static int doreadonly(struct op *t);
605 static void rdexp(char **wp, void (*f) (struct var *), int key);
606 static void badid(char *s);
607 static int doset(struct op *t);
608 static void varput(char *s, int out);
609 static int dotimes(struct op *t);
610 static int expand(char *cp, struct wdblock **wbp, int f);
611 static char *blank(int f);
612 static int dollar(int quoted);
613 static int grave(int quoted);
614 static void globname(char *we, char *pp);
615 static char *generate(char *start1, char *end1, char *middle, char *end);
616 static int anyspcl(struct wdblock *wb);
617 static int xstrcmp(char *p1, char *p2);
618 static void glob0(char *a0, unsigned int a1, int a2,
619 int (*a3) (char *, char *));
620 static void glob1(char *base, char *lim);
621 static void glob2(char *i, char *j);
622 static void glob3(char *i, char *j, char *k);
623 static void readhere(char **name, char *s, int ec);
624 static void pushio(struct ioarg *argp, int (*f) (struct ioarg *));
625 static int xxchar(struct ioarg *ap);
630 struct ioword *h_iop;
634 static const char * const signame[] = {
637 (char *) NULL, /* interrupt */
639 "Illegal instruction",
643 "Floating Point Exception",
648 (char *) NULL, /* broken pipe */
653 #define NSIGNAL (sizeof(signame)/sizeof(signame[0]))
659 static const struct res restab[] = {
685 int (*builtinfunc) (struct op * t);
687 static const struct builtincmd builtincmds[] = {
692 {"continue", docontinue},
696 {"export", doexport},
701 {"readonly", doreadonly},
711 static struct op *scantree(struct op *);
712 static struct op *dowholefile(int, int);
715 extern char **environ; /* environment pointer */
721 static int interactive; /* Is this an interactive shell */
723 static int multiline; /* \n changed to ; */
724 static struct op *outtree; /* result from parser */
727 static struct brkcon *brklist;
729 static struct wdblock *wdlist;
730 static struct wdblock *iolist;
731 static char *trap[_NSIG + 1];
732 static char ourtrap[_NSIG + 1];
733 static int trapset; /* trap pending */
734 static int yynerrs; /* yacc */
735 static char line[LINELIM];
738 static struct var *mshdbg_var;
740 static struct var *vlist; /* dictionary */
741 static struct var *homedir; /* home directory */
742 static struct var *prompt; /* main prompt */
743 static struct var *cprompt; /* continuation prompt */
744 static struct var *path; /* search path for commands */
745 static struct var *shell; /* shell to interpret command files */
746 static struct var *ifs; /* field separators */
748 static int areanum; /* current allocation area */
751 static char flags['z' - 'a' + 1];
752 static char *flag = flags - 'a';
753 static char *null = "";
754 static int heedint = 1;
755 static void (*qflag) (int) = SIG_IGN;
759 static int iounit = IODEFAULT;
760 static YYSTYPE yylval;
761 static char *elinep = line + sizeof(line) - 5;
763 static struct ioarg temparg = { 0, 0, 0, AFID_NOBUF, 0 }; /* temporary for PUSHIO */
764 static struct ioarg ioargstack[NPUSH];
765 static struct io iostack[NPUSH];
766 static struct iobuf sharedbuf = { AFID_NOBUF };
767 static struct iobuf mainbuf = { AFID_NOBUF };
768 static unsigned bufid = AFID_ID; /* buffer id counter */
770 static struct here *inhere; /* list of hear docs while parsing */
771 static struct here *acthere; /* list of active here documents */
772 static struct region *areabot; /* bottom of area */
773 static struct region *areatop; /* top of area */
774 static struct region *areanxt; /* starting point of scan */
776 static void *brkaddr;
778 static struct env e = {
779 line, /* linep: char ptr */
780 iostack, /* iobase: struct io ptr */
781 iostack - 1, /* iop: struct io ptr */
782 (xint *) NULL, /* errpt: void ptr for errors? */
783 FDBASE, /* iofd: file desc */
784 (struct env *) NULL /* oenv: struct env ptr */
788 void print_t(struct op *t);
789 void print_t(struct op *t)
791 DBGPRINTF(("T: t=%p, type %s, words=%p, IOword=%p\n", t,
792 T_CMD_NAMES[t->type], t->words, t->ioact));
795 DBGPRINTF(("T: W1: %s", t->words[0]));
801 void print_tree(struct op *head);
802 void print_tree(struct op *head)
805 DBGPRINTF(("PRINT_TREE: no tree\n"));
809 DBGPRINTF(("NODE: %p, left %p, right %p\n", head, head->left,
813 print_tree(head->left);
816 print_tree(head->right);
820 #endif /* MSHDEBUG */
823 #ifdef CONFIG_FEATURE_COMMAND_EDITING
824 static char *current_prompt;
827 /* -------- sh.c -------- */
833 int msh_main(int argc, char **argv)
839 int (*iof) (struct ioarg *);
841 DBGPRINTF(("MSH_MAIN: argc %d, environ %p\n", argc, environ));
844 if ((ap = environ) != NULL) {
846 assign(*ap++, !COPYV);
847 for (ap = environ; *ap;)
848 export(lookup(*ap++));
853 shell = lookup("SHELL");
854 if (shell->value == null)
855 setval(shell, (char *)DEFAULT_SHELL);
858 homedir = lookup("HOME");
859 if (homedir->value == null)
860 setval(homedir, "/");
863 setval(lookup("$"), putn(getpid()));
865 path = lookup("PATH");
866 if (path->value == null) {
868 setval(path, "/sbin:/bin:/usr/sbin:/usr/bin");
870 setval(path, "/bin:/usr/bin");
875 if (ifs->value == null)
876 setval(ifs, " \t\n");
879 mshdbg_var = lookup("MSHDEBUG");
880 if (mshdbg_var->value == null)
881 setval(mshdbg_var, "0");
885 prompt = lookup("PS1");
886 #ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
887 if (prompt->value == null)
889 setval(prompt, DEFAULT_USER_PROMPT);
890 if (geteuid() == 0) {
891 setval(prompt, DEFAULT_ROOT_PROMPT);
892 prompt->status &= ~EXPORT;
894 cprompt = lookup("PS2");
895 #ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
896 if (cprompt->value == null)
898 setval(cprompt, "> ");
904 if (argv[0][0] == '-' && argv[0][1] != '\0') {
905 for (s = argv[0] + 1; *s; s++)
908 prompt->status &= ~EXPORT;
909 cprompt->status &= ~EXPORT;
914 PUSHIO(aword, *++argv, iof = nlchar);
926 prompt->status &= ~EXPORT;
934 if (*s >= 'a' && *s <= 'z')
942 if (iof == filechar && --argc > 0) {
945 prompt->status &= ~EXPORT;
946 cprompt->status &= ~EXPORT;
948 /* Shell is non-interactive, activate printf-based debug */
950 mshdbg = (int) (((char) (mshdbg_var->value[0])) - '0');
954 DBGPRINTF(("MSH_MAIN: calling newfile()\n"));
956 if (newfile(name = *++argv))
957 exit(1); /* Exit on error */
963 /* This won't be true if PUSHIO has been called, say from newfile() above */
964 if (e.iop < iostack) {
965 PUSHIO(afile, 0, iof);
966 if (isatty(0) && isatty(1) && !cflag) {
968 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
970 printf("\n\n%s Built-in shell (msh with debug)\n", BB_BANNER);
972 printf("\n\n%s Built-in shell (msh)\n", BB_BANNER);
974 printf("Enter 'help' for a list of built-in commands.\n\n");
979 signal(SIGQUIT, qflag);
980 if (name && name[0] == '-') {
982 if ((f = open(".profile", 0)) >= 0)
984 if ((f = open("/etc/profile", 0)) >= 0)
988 signal(SIGTERM, sig);
990 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
991 signal(SIGINT, onintr);
996 for (ap = ++argv; --argc > 0;) {
997 if (assign(*ap = *argv++, !COPYV)) {
998 dolc--; /* keyword */
1004 setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc));
1006 DBGPRINTF(("MSH_MAIN: begin FOR loop, interactive %d, e.iop %p, iostack %p\n", interactive, e.iop, iostack));
1009 if (interactive && e.iop <= iostack) {
1010 #ifdef CONFIG_FEATURE_COMMAND_EDITING
1011 current_prompt = prompt->value;
1017 /* Ensure that getenv("PATH") stays current */
1018 setenv("PATH", path->value, 1);
1021 DBGPRINTF(("MSH_MAIN: returning.\n"));
1024 static void setdash()
1028 char m['z' - 'a' + 1];
1031 for (c = 'a'; c <= 'z'; c++)
1035 setval(lookup("-"), m);
1038 static int newfile(s)
1043 DBGPRINTF7(("NEWFILE: opening %s\n", s));
1045 if (strcmp(s, "-") != 0) {
1046 DBGPRINTF(("NEWFILE: s is %s\n", s));
1050 err(": cannot open");
1061 struct op *scantree(head)
1069 if (head->left != NULL) {
1070 dotnode = scantree(head->left);
1075 if (head->right != NULL) {
1076 dotnode = scantree(head->right);
1081 if (head->words == NULL)
1084 DBGPRINTF5(("SCANTREE: checking node %p\n", head));
1086 if ((head->type != TDOT) && (strcmp(".", head->words[0]) == 0)) {
1087 DBGPRINTF5(("SCANTREE: dot found in node %p\n", head));
1095 static void onecommand()
1100 DBGPRINTF(("ONECOMMAND: enter, outtree=%p\n", outtree));
1119 setjmp(failpt = m1); /* Bruce Evans' fix */
1120 if (setjmp(failpt = m1) || yyparse() || intr) {
1122 DBGPRINTF(("ONECOMMAND: this is not good.\n"));
1127 if (!interactive && intr)
1140 DBGPRINTF(("ONECOMMAND: calling execute, t=outtree=%p\n",
1142 execute(outtree, NOPIPE, NOPIPE, 0);
1145 if (!interactive && intr) {
1150 if ((i = trapset) != 0) {
1164 DBGPRINTF(("LEAVE: leave called!\n"));
1196 longjmp(e.errpt, 1);
1198 e.iop = e.iobase = iostack;
1201 static int newenv(f)
1204 REGISTER struct env *ep;
1206 DBGPRINTF(("NEWENV: f=%d (indicates quitenv and return)\n", f));
1213 ep = (struct env *) space(sizeof(*ep));
1226 static void quitenv()
1228 REGISTER struct env *ep;
1231 DBGPRINTF(("QUITENV: e.oenv=%p\n", e.oenv));
1233 if ((ep = e.oenv) != NULL) {
1236 /* should close `'d files */
1238 while (--fd >= e.iofd)
1244 * Is any character from s1 in s2?
1246 static int anys(s1, s2)
1247 REGISTER char *s1, *s2;
1256 * Is character c in s?
1258 static int any(c, s)
1268 static char *putn(n)
1274 static char *itoa(n)
1279 snprintf(s, sizeof(s), "%u", n);
1284 static void next(int f)
1286 PUSHIO(afile, f, filechar);
1289 static void onintr(s)
1290 int s; /* ANSI C requires a parameter */
1292 signal(SIGINT, onintr);
1299 } else if (heedint) {
1305 static char *space(n)
1310 if ((cp = getcell(n)) == 0)
1311 err("out of string space");
1315 static char *strsave(s, a)
1319 REGISTER char *cp, *xp;
1321 if ((cp = space(strlen(s) + 1)) != NULL) {
1322 setarea((char *) cp, a);
1323 for (xp = cp; (*xp++ = *s++) != '\0';);
1339 static void runtrap(i)
1344 if ((trapstr = trap[i]) == NULL)
1350 RUN(aword, trapstr, nlchar);
1353 /* -------- var.c -------- */
1356 * Find the given name in the dictionary
1357 * and return its value. If the name was
1358 * not previously there, enter it now and
1359 * return a null value.
1361 static struct var *lookup(n)
1364 REGISTER struct var *vp;
1367 static struct var dummy;
1371 for (c = 0; isdigit(*n) && c < 1000; n++)
1372 c = c * 10 + *n - '0';
1373 dummy.status = RONLY;
1374 dummy.value = c <= dolc ? dolv[c] : null;
1377 for (vp = vlist; vp; vp = vp->next)
1378 if (eqname(vp->name, n))
1381 vp = (struct var *) space(sizeof(*vp));
1382 if (vp == 0 || (vp->name = space((int) (cp - n) + 2)) == 0) {
1383 dummy.name = dummy.value = "";
1386 for (cp = vp->name; (*cp = *n++) && *cp != '='; cp++);
1390 setarea((char *) vp, 0);
1391 setarea((char *) vp->name, 0);
1394 vp->status = GETCELL;
1400 * give variable at `vp' the value `val'.
1402 static void setval(vp, val)
1406 nameval(vp, val, (char *) NULL);
1410 * if name is not NULL, it must be
1411 * a prefix of the space `val',
1413 * this is all so that exporting
1414 * values is reasonably painless.
1416 static void nameval(vp, val, name)
1417 REGISTER struct var *vp;
1420 REGISTER char *cp, *xp;
1424 if (vp->status & RONLY) {
1425 for (xp = vp->name; *xp && *xp != '=';)
1426 putc(*xp++, stderr);
1427 err(" is read-only");
1432 xp = space(strlen(vp->name) + strlen(val) + 2);
1435 /* make string: name=value */
1436 setarea((char *) xp, 0);
1438 for (cp = vp->name; (*xp = *cp++) && *xp != '='; xp++);
1442 for (cp = val; (*xp++ = *cp++) != '\0';);
1446 if (vp->status & GETCELL)
1447 freecell(vp->name); /* form new string `name=value' */
1453 static void export(vp)
1456 vp->status |= EXPORT;
1459 static void ronly(vp)
1462 if (isalpha(vp->name[0]) || vp->name[0] == '_') /* not an internal symbol */
1463 vp->status |= RONLY;
1466 static int isassign(s)
1469 DBGPRINTF7(("ISASSIGN: enter, s=%s\n", s));
1471 if (!isalpha((int) *s) && *s != '_')
1473 for (; *s != '='; s++)
1474 if (*s == 0 || (!isalnum(*s) && *s != '_'))
1480 static int assign(s, cf)
1487 DBGPRINTF7(("ASSIGN: enter, s=%s, cf=%d\n", s, cf));
1489 if (!isalpha(*s) && *s != '_')
1491 for (cp = s; *cp != '='; cp++)
1492 if (*cp == 0 || (!isalnum(*cp) && *cp != '_'))
1495 nameval(vp, ++cp, cf == COPYV ? (char *) NULL : s);
1497 vp->status &= ~GETCELL;
1501 static int checkname(cp)
1504 DBGPRINTF7(("CHECKNAME: enter, cp=%s\n", cp));
1506 if (!isalpha(*cp++) && *(cp - 1) != '_')
1509 if (!isalnum(*cp++) && *(cp - 1) != '_')
1514 static void putvlist(f, out)
1515 REGISTER int f, out;
1517 REGISTER struct var *vp;
1519 for (vp = vlist; vp; vp = vp->next)
1520 if (vp->status & f && (isalpha(*vp->name) || *vp->name == '_')) {
1521 if (vp->status & EXPORT)
1522 write(out, "export ", 7);
1523 if (vp->status & RONLY)
1524 write(out, "readonly ", 9);
1525 write(out, vp->name, (int) (findeq(vp->name) - vp->name));
1526 write(out, "\n", 1);
1530 static int eqname(n1, n2)
1531 REGISTER char *n1, *n2;
1533 for (; *n1 != '=' && *n1 != 0; n1++)
1536 return (*n2 == 0 || *n2 == '=');
1539 static char *findeq(cp)
1542 while (*cp != '\0' && *cp != '=')
1547 /* -------- gmatch.c -------- */
1549 * int gmatch(string, pattern)
1550 * char *string, *pattern;
1552 * Match a pattern as in sh(1).
1557 #define QMASK (CMASK&~QUOTE)
1558 #define NOT '!' /* might use ^ */
1560 static int gmatch(s, p)
1561 REGISTER char *s, *p;
1563 REGISTER int sc, pc;
1565 if (s == NULL || p == NULL)
1567 while ((pc = *p++ & CMASK) != '\0') {
1571 if ((p = cclass(p, sc)) == NULL)
1583 if (*p == '\0' || gmatch(s, p))
1585 } while (*s++ != '\0');
1589 if (sc != (pc & ~QUOTE))
1596 static char *cclass(p, sub)
1600 REGISTER int c, d, not, found;
1602 if ((not = *p == NOT) != 0)
1607 return ((char *) NULL);
1609 if (p[1] == '-' && p[2] != ']') {
1614 if (c == sub || (c <= sub && sub <= d))
1616 } while (*++p != ']');
1617 return (found ? p + 1 : (char *) NULL);
1621 /* -------- area.c -------- */
1624 * All memory between (char *)areabot and (char *)(areatop+1) is
1625 * exclusively administered by the area management routines.
1626 * It is assumed that sbrk() and brk() manipulate the high end.
1629 #define sbrk(X) ({ void * __q = (void *)-1; if (brkaddr + (int)(X) < brktop) { __q = brkaddr; brkaddr+=(int)(X); } __q;})
1631 static void initarea()
1633 brkaddr = xmalloc(AREASIZE);
1634 brktop = brkaddr + AREASIZE;
1636 while ((long) sbrk(0) & ALIGN)
1638 areabot = (struct region *) sbrk(REGSIZE);
1640 areabot->next = areabot;
1641 areabot->area = BUSY;
1646 char *getcell(nbytes)
1649 REGISTER int nregio;
1650 REGISTER struct region *p, *q;
1657 /* silly and defeats the algorithm */
1659 * round upwards and add administration area
1661 nregio = (nbytes + (REGSIZE - 1)) / REGSIZE + 1;
1662 for (p = areanxt;;) {
1663 if (p->area > areanum) {
1667 while ((q = p->next)->area > areanum && q != areanxt)
1670 * exit loop if cell big enough
1672 if (q >= p + nregio)
1679 i = nregio >= GROWBY ? nregio : GROWBY;
1680 p = (struct region *) sbrk(i * REGSIZE);
1681 if (p == (struct region *) -1)
1682 return ((char *) NULL);
1686 abort(); /* allocated areas are contiguous */
1696 * we found a FREE area big enough, pointed to by 'p', and up to 'q'
1698 areanxt = p + nregio;
1701 * split into requested area and rest
1703 if (areanxt + 1 > q) {
1705 abort(); /* insufficient space left for admin */
1708 areanxt->area = FREE;
1712 return ((char *) (p + 1));
1715 static void freecell(cp)
1718 REGISTER struct region *p;
1720 if ((p = (struct region *) cp) != NULL) {
1728 static void freearea(a)
1731 REGISTER struct region *p, *top;
1734 for (p = areabot; p != top; p = p->next)
1739 static void setarea(cp, a)
1743 REGISTER struct region *p;
1745 if ((p = (struct region *) cp) != NULL)
1752 return ((struct region *) cp - 1)->area;
1755 static void garbage()
1757 REGISTER struct region *p, *q, *top;
1760 for (p = areabot; p != top; p = p->next) {
1761 if (p->area > areanum) {
1762 while ((q = p->next)->area > areanum)
1768 if (areatop >= q + SHRINKBY && q->area > areanum) {
1769 brk((char *) (q + 1));
1777 /* -------- csyn.c -------- */
1779 * shell: syntax (C version)
1784 DBGPRINTF7(("YYPARSE: enter...\n"));
1791 return (yynerrs != 0);
1794 static struct op *pipeline(cf)
1797 REGISTER struct op *t, *p;
1800 DBGPRINTF7(("PIPELINE: enter, cf=%d\n", cf));
1804 DBGPRINTF9(("PIPELINE: t=%p\n", t));
1807 while ((c = yylex(0)) == '|') {
1808 if ((p = command(CONTIN)) == NULL) {
1809 DBGPRINTF8(("PIPELINE: error!\n"));
1813 if (t->type != TPAREN && t->type != TCOM) {
1814 /* shell statement */
1815 t = block(TPAREN, t, NOBLOCK, NOWORDS);
1818 t = block(TPIPE, t, p, NOWORDS);
1823 DBGPRINTF7(("PIPELINE: returning t=%p\n", t));
1827 static struct op *andor()
1829 REGISTER struct op *t, *p;
1832 DBGPRINTF7(("ANDOR: enter...\n"));
1836 DBGPRINTF9(("ANDOR: t=%p\n", t));
1839 while ((c = yylex(0)) == LOGAND || c == LOGOR) {
1840 if ((p = pipeline(CONTIN)) == NULL) {
1841 DBGPRINTF8(("ANDOR: error!\n"));
1845 t = block(c == LOGAND ? TAND : TOR, t, p, NOWORDS);
1851 DBGPRINTF7(("ANDOR: returning t=%p\n", t));
1855 static struct op *c_list()
1857 REGISTER struct op *t, *p;
1860 DBGPRINTF7(("C_LIST: enter...\n"));
1865 if ((peeksym = yylex(0)) == '&')
1866 t = block(TASYNC, t, NOBLOCK, NOWORDS);
1868 while ((c = yylex(0)) == ';' || c == '&'
1869 || (multiline && c == '\n')) {
1871 if ((p = andor()) == NULL)
1874 if ((peeksym = yylex(0)) == '&')
1875 p = block(TASYNC, p, NOBLOCK, NOWORDS);
1883 DBGPRINTF7(("C_LIST: returning t=%p\n", t));
1887 static int synio(cf)
1890 REGISTER struct ioword *iop;
1894 DBGPRINTF7(("SYNIO: enter, cf=%d\n", cf));
1896 if ((c = yylex(cf)) != '<' && c != '>') {
1903 iop = io(iounit, i, yylval.cp);
1907 markhere(yylval.cp, iop);
1909 DBGPRINTF7(("SYNIO: returning 1\n"));
1913 static void musthave(c, cf)
1916 if ((peeksym = yylex(cf)) != c) {
1917 DBGPRINTF7(("MUSTHAVE: error!\n"));
1924 static struct op *simple()
1926 REGISTER struct op *t;
1930 switch (peeksym = yylex(0)) {
1951 static struct op *nested(type, mark)
1954 REGISTER struct op *t;
1956 DBGPRINTF3(("NESTED: enter, type=%d, mark=%d\n", type, mark));
1962 return (block(type, t, NOBLOCK, NOWORDS));
1965 static struct op *command(cf)
1968 REGISTER struct op *t;
1969 struct wdblock *iosave;
1972 DBGPRINTF(("COMMAND: enter, cf=%d\n", cf));
1988 if ((t = simple()) == NULL) {
1990 return ((struct op *) NULL);
1997 t = nested(TPAREN, ')');
2001 t = nested(TBRACE, '}');
2011 t->words = wordlist();
2012 if ((c = yylex(0)) != '\n' && c != ';')
2014 t->left = dogroup(0);
2022 t->type = c == WHILE ? TWHILE : TUNTIL;
2024 t->right = dogroup(1);
2036 musthave(IN, CONTIN);
2039 t->left = caselist();
2050 t->right = thenpart();
2059 musthave(WORD, 0); /* gets name of file */
2060 DBGPRINTF7(("COMMAND: DOT clause, yylval.cp is %s\n", yylval.cp));
2062 word(yylval.cp); /* add word to wdlist */
2063 word(NOWORD); /* terminate wdlist */
2064 t->words = copyw(); /* dup wdlist */
2074 DBGPRINTF(("COMMAND: returning %p\n", t));
2079 static struct op *dowholefile(type, mark)
2083 REGISTER struct op *t;
2085 DBGPRINTF(("DOWHOLEFILE: enter, type=%d, mark=%d\n", type, mark));
2090 t = block(type, t, NOBLOCK, NOWORDS);
2091 DBGPRINTF(("DOWHOLEFILE: return t=%p\n", t));
2095 static struct op *dogroup(onlydone)
2099 REGISTER struct op *mylist;
2102 if (c == DONE && onlydone)
2103 return ((struct op *) NULL);
2111 static struct op *thenpart()
2114 REGISTER struct op *t;
2116 if ((c = yylex(0)) != THEN) {
2118 return ((struct op *) NULL);
2123 if (t->left == NULL)
2125 t->right = elsepart();
2129 static struct op *elsepart()
2132 REGISTER struct op *t;
2134 switch (c = yylex(0)) {
2136 if ((t = c_list()) == NULL)
2144 t->right = thenpart();
2149 return ((struct op *) NULL);
2153 static struct op *caselist()
2155 REGISTER struct op *t;
2158 while ((peeksym = yylex(CONTIN)) != ESAC) {
2159 DBGPRINTF(("CASELIST, doing yylex, peeksym=%d\n", peeksym));
2160 t = list(t, casepart());
2163 DBGPRINTF(("CASELIST, returning t=%p\n", t));
2167 static struct op *casepart()
2169 REGISTER struct op *t;
2171 DBGPRINTF7(("CASEPART: enter...\n"));
2175 t->words = pattern();
2178 if ((peeksym = yylex(CONTIN)) != ESAC)
2179 musthave(BREAK, CONTIN);
2181 DBGPRINTF7(("CASEPART: made newtp(TPAT, t=%p)\n", t));
2186 static char **pattern()
2195 } while ((c = yylex(0)) == '|');
2202 static char **wordlist()
2206 if ((c = yylex(0)) != IN) {
2208 return ((char **) NULL);
2211 while ((c = yylex(0)) == WORD)
2219 * supporting functions
2221 static struct op *list(t1, t2)
2222 REGISTER struct op *t1, *t2;
2224 DBGPRINTF7(("LIST: enter, t1=%p, t2=%p\n", t1, t2));
2231 return (block(TLIST, t1, t2, NOWORDS));
2234 static struct op *block(type, t1, t2, wp)
2239 REGISTER struct op *t;
2241 DBGPRINTF7(("BLOCK: enter, type=%d (%s)\n", type, T_CMD_NAMES[type]));
2249 DBGPRINTF7(("BLOCK: inserted %p between %p and %p\n", t, t1,
2255 /* See if given string is a shell multiline (FOR, IF, etc) */
2256 static int rlookup(n)
2259 REGISTER const struct res *rp;
2261 DBGPRINTF7(("RLOOKUP: enter, n is %s\n", n));
2263 for (rp = restab; rp->r_name; rp++)
2264 if (strcmp(rp->r_name, n) == 0) {
2265 DBGPRINTF7(("RLOOKUP: match, returning %d\n", rp->r_val));
2266 return (rp->r_val); /* Return numeric code for shell multiline */
2269 DBGPRINTF7(("RLOOKUP: NO match, returning 0\n"));
2270 return (0); /* Not a shell multiline */
2273 static struct op *newtp()
2275 REGISTER struct op *t;
2277 t = (struct op *) tree(sizeof(*t));
2285 DBGPRINTF3(("NEWTP: allocated %p\n", t));
2290 static struct op *namelist(t)
2291 REGISTER struct op *t;
2294 DBGPRINTF7(("NAMELIST: enter, t=%p, type %s, iolist=%p\n", t,
2295 T_CMD_NAMES[t->type], iolist));
2298 iolist = addword((char *) NULL, iolist);
2299 t->ioact = copyio();
2303 if (t->type != TCOM) {
2304 if (t->type != TPAREN && t->ioact != NULL) {
2305 t = block(TPAREN, t, NOBLOCK, NOWORDS);
2306 t->ioact = t->left->ioact;
2307 t->left->ioact = NULL;
2319 static char **copyw()
2323 wd = getwords(wdlist);
2328 static void word(cp)
2331 wdlist = addword(cp, wdlist);
2334 static struct ioword **copyio()
2336 REGISTER struct ioword **iop;
2338 iop = (struct ioword **) getwords(iolist);
2343 static struct ioword *io(u, f, cp)
2348 REGISTER struct ioword *iop;
2350 iop = (struct ioword *) tree(sizeof(*iop));
2354 iolist = addword((char *) iop, iolist);
2360 yyerror("syntax error");
2363 static void yyerror(s)
2367 if (interactive && e.iop <= iostack) {
2369 while (eofc() == 0 && yylex(0) != '\n');
2375 static int yylex(cf)
2381 if ((c = peeksym) > 0) {
2396 line[LINELIM - 1] = '\0';
2399 while ((c = my_getc(0)) == ' ' || c == '\t') /* Skip whitespace */
2404 if (any(c, "0123456789")) {
2405 unget(c1 = my_getc(0));
2406 if (c1 == '<' || c1 == '>') {
2415 case '#': /* Comment, skip to next newline or End-of-string */
2416 while ((c = my_getc(0)) != 0 && c != '\n');
2421 DBGPRINTF5(("YYLEX: return 0, c=%d\n", c));
2425 DBGPRINTF9(("YYLEX: found $\n"));
2427 if ((c = my_getc(0)) == '{') {
2428 if ((c = collect(c, '}')) != '\0')
2437 if ((c = collect(c, c)) != '\0')
2445 /* If more chars process them, else return NULL char */
2446 if ((c1 = dual(c)) != '\0')
2463 if (multiline || cf & CONTIN) {
2464 if (interactive && e.iop <= iostack) {
2465 #ifdef CONFIG_FEATURE_COMMAND_EDITING
2466 current_prompt = cprompt->value;
2468 prs(cprompt->value);
2485 while ((c = my_getc(0)) != 0 && !any(c, "`$ '\"\t;&<>()|^\n")) {
2486 if (e.linep >= elinep)
2487 err("word too long");
2494 if (any(c, "\"'`$"))
2499 if (atstart && (c = rlookup(line)) != 0) {
2504 yylval.cp = strsave(line, areanum);
2509 static int collect(c, c1)
2514 DBGPRINTF8(("COLLECT: enter, c=%d, c1=%d\n", c, c1));
2517 while ((c = my_getc(c1)) != c1) {
2526 if (interactive && c == '\n' && e.iop <= iostack) {
2527 #ifdef CONFIG_FEATURE_COMMAND_EDITING
2528 current_prompt = cprompt->value;
2530 prs(cprompt->value);
2538 DBGPRINTF8(("COLLECT: return 0, line is %s\n", line));
2543 /* "multiline commands" helper func */
2544 /* see if next 2 chars form a shell multiline */
2549 REGISTER char *cp = s;
2551 DBGPRINTF8(("DUAL: enter, c=%d\n", c));
2553 *cp++ = c; /* c is the given "peek" char */
2554 *cp++ = my_getc(0); /* get next char of input */
2555 *cp = 0; /* add EOS marker */
2557 c = rlookup(s); /* see if 2 chars form a shell multiline */
2559 unget(*--cp); /* String is not a shell multiline, put peek char back */
2561 return (c); /* String is multiline, return numeric multiline (restab) code */
2564 static void diag(ec)
2569 DBGPRINTF8(("DIAG: enter, ec=%d\n", ec));
2572 if (c == '>' || c == '<') {
2575 yylval.i = ec == '>' ? IOWRITE | IOCAT : IOHERE;
2578 yylval.i = ec == '>' ? IOWRITE : IOREAD;
2579 if (c != '&' || yylval.i == IOHERE)
2585 static char *tree(size)
2590 if ((t = getcell(size)) == NULL) {
2591 DBGPRINTF2(("TREE: getcell(%d) failed!\n", size));
2592 prs("command line too complicated\n");
2602 /* -------- exec.c -------- */
2609 static int execute(t, pin, pout, act)
2610 REGISTER struct op *t;
2614 REGISTER struct op *t1;
2615 volatile int i, rv, a;
2616 char *cp, **wp, **wp2;
2618 struct op *outtree_save;
2622 /* Avoid longjmp clobbering */
2627 DBGPRINTF4(("EXECUTE: enter, t==null, returning.\n"));
2631 DBGPRINTF(("EXECUTE: t=%p, t->type=%d (%s), t->words is %s\n", t,
2632 t->type, T_CMD_NAMES[t->type],
2633 ((t->words == NULL) ? "NULL" : t->words[0])));
2637 wp = (wp2 = t->words) != NULL
2638 ? eval(wp2, t->type == TCOM ? DOALL : DOALL & ~DOKEY)
2641 /* Hard to know how many words there are, be careful of garbage pointer values */
2642 /* They are likely to cause "PCI bus fault" errors */
2644 DBGPRINTF(("EXECUTE: t->left=%p, t->right=%p, t->words[1] is %s\n",
2646 ((t->words[1] == NULL) ? "NULL" : t->words[1])));
2647 DBGPRINTF7(("EXECUTE: t->words[2] is %s, t->words[3] is %s\n",
2648 ((t->words[2] == NULL) ? "NULL" : t->words[2]),
2649 ((t->words[3] == NULL) ? "NULL" : t->words[3])));
2655 DBGPRINTF3(("EXECUTE: TDOT\n"));
2657 outtree_save = outtree;
2659 newfile(evalstr(t->words[0], DOALL));
2661 t->left = dowholefile(TLIST, 0);
2664 outtree = outtree_save;
2667 rv = execute(t->left, pin, pout, 0);
2669 rv = execute(t->right, pin, pout, 0);
2673 rv = execute(t->left, pin, pout, 0);
2678 rv = forkexec(t, pin, pout, act, wp);
2686 if ((rv = openpipe(pv)) < 0)
2688 pv[0] = remap(pv[0]);
2689 pv[1] = remap(pv[1]);
2690 (void) execute(t->left, pin, pv, 0);
2691 rv = execute(t->right, pv, pout, 0);
2696 (void) execute(t->left, pin, pout, 0);
2697 rv = execute(t->right, pin, pout, 0);
2702 int hinteractive = interactive;
2704 DBGPRINTF7(("EXECUTE: TASYNC clause, calling vfork()...\n"));
2708 interactive = hinteractive;
2710 setval(lookup("!"), putn(i));
2721 signal(SIGINT, SIG_IGN);
2722 signal(SIGQUIT, SIG_IGN);
2724 signal(SIGTERM, SIG_DFL);
2728 open(bb_dev_null, 0);
2730 _exit(execute(t->left, pin, pout, FEXEC));
2737 rv = execute(t->left, pin, pout, 0);
2738 if ((t1 = t->right) != NULL && (rv == 0) == (t->type == TAND))
2739 rv = execute(t1, pin, pout, 0);
2749 while (*wp++ != NULL);
2751 vp = lookup(t->str);
2752 while (setjmp(bc.brkpt))
2756 for (t1 = t->left; i-- && *wp != NULL;) {
2758 rv = execute(t1, pin, pout, 0);
2760 brklist = brklist->nextlev;
2765 while (setjmp(bc.brkpt))
2770 while ((execute(t1, pin, pout, 0) == 0) == (t->type == TWHILE))
2771 rv = execute(t->right, pin, pout, 0);
2772 brklist = brklist->nextlev;
2777 if (t->right != NULL) {
2778 rv = !execute(t->left, pin, pout, 0) ?
2779 execute(t->right->left, pin, pout, 0) :
2780 execute(t->right->right, pin, pout, 0);
2785 if ((cp = evalstr(t->str, DOSUB | DOTRIM)) == 0)
2788 DBGPRINTF7(("EXECUTE: TCASE, t->str is %s, cp is %s\n",
2789 ((t->str == NULL) ? "NULL" : t->str),
2790 ((cp == NULL) ? "NULL" : cp)));
2792 if ((t1 = findcase(t->left, cp)) != NULL) {
2793 DBGPRINTF7(("EXECUTE: TCASE, calling execute(t=%p, t1=%p)...\n", t, t1));
2794 rv = execute(t1, pin, pout, 0);
2795 DBGPRINTF7(("EXECUTE: TCASE, back from execute(t=%p, t1=%p)...\n", t, t1));
2801 if (iopp = t->ioact)
2803 if (iosetup(*iopp++, pin!=NULL, pout!=NULL)) {
2808 if (rv >= 0 && (t1 = t->left))
2809 rv = execute(t1, pin, pout, 0);
2820 if (interactive && intr) {
2825 if ((i = trapset) != 0) {
2830 DBGPRINTF(("EXECUTE: returning from t=%p, rv=%d\n", t, rv));
2835 forkexec(REGISTER struct op *t, int *pin, int *pout, int act, char **wp)
2839 int (*shcom) (struct op *) = NULL;
2842 struct ioword **iopp;
2852 struct brkcon *hbrklist;
2856 /* Avoid longjmp clobbering */
2866 DBGPRINTF(("FORKEXEC: t=%p, pin %p, pout %p, act %d\n", t, pin,
2868 DBGPRINTF7(("FORKEXEC: t->words is %s\n",
2869 ((t->words == NULL) ? "NULL" : t->words[0])));
2871 /* Hard to know how many words there are, be careful of garbage pointer values */
2872 /* They are likely to cause "PCI bus fault" errors */
2874 DBGPRINTF7(("FORKEXEC: t->words is %s, t->words[1] is %s\n",
2875 ((t->words == NULL) ? "NULL" : t->words[0]),
2876 ((t->words == NULL) ? "NULL" : t->words[1])));
2877 DBGPRINTF7(("FORKEXEC: wp is %s, wp[1] is %s\n",
2878 ((wp == NULL) ? "NULL" : wp[0]),
2879 ((wp[1] == NULL) ? "NULL" : wp[1])));
2880 DBGPRINTF7(("FORKEXEC: wp2 is %s, wp[3] is %s\n",
2881 ((wp[2] == NULL) ? "NULL" : wp[2]),
2882 ((wp[3] == NULL) ? "NULL" : wp[3])));
2888 rv = -1; /* system-detected error */
2889 if (t->type == TCOM) {
2890 while ((cp = *wp++) != NULL);
2893 /* strip all initial assignments */
2894 /* not correct wrt PATH=yyy command etc */
2896 DBGPRINTF9(("FORKEXEC: echo'ing, cp=%p, wp=%p, owp=%p\n",
2898 echo(cp ? wp : owp);
2901 DBGPRINTF9(("FORKEXEC: t->words is %s, t->words[1] is %s\n",
2902 ((t->words == NULL) ? "NULL" : t->words[0]),
2903 ((t->words == NULL) ? "NULL" : t->words[1])));
2904 DBGPRINTF9(("FORKEXEC: wp is %s, wp[1] is %s\n",
2905 ((wp == NULL) ? "NULL" : wp[0]),
2906 ((wp == NULL) ? "NULL" : wp[1])));
2909 if (cp == NULL && t->ioact == NULL) {
2910 while ((cp = *owp++) != NULL && assign(cp, COPYV));
2911 DBGPRINTF(("FORKEXEC: returning setstatus()\n"));
2912 return (setstatus(0));
2913 } else if (cp != NULL) {
2914 shcom = inbuilt(cp);
2922 DBGPRINTF3(("FORKEXEC: t->words is %s, t->words[1] is %s\n",
2923 ((t->words == NULL) ? "NULL" : t->words[0]),
2924 ((t->words == NULL) ? "NULL" : t->words[1])));
2926 DBGPRINTF(("FORKEXEC: shcom %p, f&FEXEC 0x%x, owp %p\n", shcom,
2929 if (shcom == NULL && (f & FEXEC) == 0) {
2930 /* Save values in case the child process alters them */
2934 hinteractive = interactive;
2939 DBGPRINTF3(("FORKEXEC: calling vfork()...\n"));
2944 DBGPRINTF(("FORKEXEC: ERROR, unable to vfork()!\n"));
2949 if (newpid > 0) { /* Parent */
2951 /* Restore values */
2955 interactive = hinteractive;
2968 return (pout == NULL ? setstatus(waitfor(newpid, 0)) : 0);
2971 /* Must be the child process, pid should be 0 */
2972 DBGPRINTF(("FORKEXEC: child process, shcom=%p\n", shcom));
2975 signal(SIGINT, SIG_IGN);
2976 signal(SIGQUIT, SIG_IGN);
2988 while ((cp = *owp++) != NULL && assign(cp, COPYV))
2993 if ((pin != NULL || pout != NULL) && shcom != NULL && shcom != doexec) {
2994 err("piping to/from shell builtins not yet done");
3010 if ((iopp = t->ioact) != NULL) {
3011 if (shcom != NULL && shcom != doexec) {
3013 err(": cannot redirect shell command");
3019 if (iosetup(*iopp++, pin != NULL, pout != NULL)) {
3027 i = setstatus((*shcom) (t));
3030 DBGPRINTF(("FORKEXEC: returning i=%d\n", i));
3034 /* should use FIOCEXCL */
3035 for (i = FDBASE; i < NOFILE; i++)
3038 signal(SIGINT, SIG_DFL);
3039 signal(SIGQUIT, SIG_DFL);
3041 /* put non-interactive processes into a different process group.
3042 * we don't support jobs, but this is at least sane: see Bug 659 */
3046 if (t->type == TPAREN)
3047 _exit(execute(t->left, NOPIPE, NOPIPE, FEXEC));
3051 cp = rexecve(wp[0], wp, makenv(0, NULL));
3058 DBGPRINTF(("FORKEXEC: calling leave(), pid=%d\n", newpid));
3066 * 0< 1> are ignored as required
3069 static int iosetup(iop, pipein, pipeout)
3070 REGISTER struct ioword *iop;
3071 int pipein, pipeout;
3073 REGISTER int u = -1;
3074 char *cp = NULL, *msg;
3076 DBGPRINTF(("IOSETUP: iop %p, pipein %i, pipeout %i\n", iop,
3079 if (iop->io_unit == IODEFAULT) /* take default */
3080 iop->io_unit = iop->io_flag & (IOREAD | IOHERE) ? 0 : 1;
3082 if (pipein && iop->io_unit == 0)
3085 if (pipeout && iop->io_unit == 1)
3088 msg = iop->io_flag & (IOREAD | IOHERE) ? "open" : "create";
3089 if ((iop->io_flag & IOHERE) == 0) {
3091 if ((cp = evalstr(cp, DOSUB | DOTRIM)) == NULL)
3095 if (iop->io_flag & IODUP) {
3096 if (cp[1] || (!isdigit(*cp) && *cp != '-')) {
3098 err(": illegal >& argument");
3102 iop->io_flag = IOCLOSE;
3103 iop->io_flag &= ~(IOREAD | IOWRITE);
3105 switch (iop->io_flag) {
3111 case IOHERE | IOXHERE:
3112 u = herein(iop->io_name, iop->io_flag & IOXHERE);
3116 case IOWRITE | IOCAT:
3117 if ((u = open(cp, 1)) >= 0) {
3118 lseek(u, (long) 0, 2);
3122 u = creat(cp, 0666);
3126 u = dup2(*cp - '0', iop->io_unit);
3130 close(iop->io_unit);
3139 if (u != iop->io_unit) {
3140 dup2(u, iop->io_unit);
3147 static void echo(wp)
3153 for (i = 0; wp[i]; i++) {
3161 static struct op **find1case(t, w)
3165 REGISTER struct op *t1;
3167 REGISTER char **wp, *cp;
3171 DBGPRINTF3(("FIND1CASE: enter, t==NULL, returning.\n"));
3172 return ((struct op **) NULL);
3175 DBGPRINTF3(("FIND1CASE: enter, t->type=%d (%s)\n", t->type,
3176 T_CMD_NAMES[t->type]));
3178 if (t->type == TLIST) {
3179 if ((tp = find1case(t->left, w)) != NULL) {
3180 DBGPRINTF3(("FIND1CASE: found one to the left, returning tp=%p\n", tp));
3183 t1 = t->right; /* TPAT */
3187 for (wp = t1->words; *wp;)
3188 if ((cp = evalstr(*wp++, DOSUB)) && gmatch(w, cp)) {
3189 DBGPRINTF3(("FIND1CASE: returning &t1->left= %p.\n",
3194 DBGPRINTF(("FIND1CASE: returning NULL\n"));
3195 return ((struct op **) NULL);
3198 static struct op *findcase(t, w)
3202 REGISTER struct op **tp;
3204 return ((tp = find1case(t, w)) != NULL ? *tp : (struct op *) NULL);
3208 * Enter a new loop level (marked for break/continue).
3210 static void brkset(bc)
3213 bc->nextlev = brklist;
3218 * Wait for the last process created.
3219 * Print a message for each process found
3220 * that was killed by a signal.
3221 * Ignore interrupt signals while waiting
3222 * unless `canintr' is true.
3224 static int waitfor(lastpid, canintr)
3225 REGISTER int lastpid;
3228 REGISTER int pid, rv;
3230 int oheedint = heedint;
3237 if (errno != EINTR || canintr)
3240 if ((rv = WAITSIG(s)) != 0) {
3242 if (signame[rv] != NULL) {
3243 if (pid != lastpid) {
3250 if (pid != lastpid) {
3259 prs(" - core dumped");
3260 if (rv >= NSIGNAL || signame[rv])
3266 } while (pid != lastpid);
3281 static int setstatus(s)
3285 setval(lookup("?"), putn(s));
3290 * PATH-searching interface to execve.
3291 * If getenv("PATH") were kept up-to-date,
3292 * execvp might be used.
3294 static char *rexecve(c, v, envp)
3295 char *c, **v, **envp;
3298 REGISTER char *sp, *tp;
3299 int eacces = 0, asis = 0;
3301 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3305 if (find_applet_by_name(name)) {
3306 /* We have to exec here since we vforked. Running
3307 * run_applet_by_name() won't work and bad things
3309 execve(CONFIG_BUSYBOX_EXEC_PATH, v, envp);
3313 DBGPRINTF(("REXECVE: c=%p, v=%p, envp=%p\n", c, v, envp));
3315 sp = any('/', c) ? "" : path->value;
3317 while (asis || *sp != '\0') {
3320 for (; *sp != '\0'; tp++)
3321 if ((*tp = *sp++) == ':') {
3327 for (i = 0; (*tp++ = c[i++]) != '\0';);
3329 DBGPRINTF3(("REXECVE: e.linep is %s\n", e.linep));
3331 execve(e.linep, v, envp);
3338 execve(DEFAULT_SHELL, v, envp);
3340 return ("no Shell");
3343 return ((char *) bb_msg_memory_exhausted);
3346 return ("argument list too long");
3353 return (errno == ENOENT ? "not found" : "cannot execute");
3357 * Run the command produced by generator `f'
3358 * applied to stream `arg'.
3360 static int run(struct ioarg *argp, int (*f) (struct ioarg *))
3363 struct wdblock *swdlist;
3364 struct wdblock *siolist;
3370 /* Avoid longjmp clobbering */
3374 DBGPRINTF(("RUN: enter, areanum %d, outtree %p, failpt %p\n",
3375 areanum, outtree, failpt));
3384 if (newenv(setjmp(errpt = ev)) == 0) {
3390 if (setjmp(failpt = rt) == 0 && yyparse() == 0)
3391 rv = execute(outtree, NOPIPE, NOPIPE, 0);
3394 DBGPRINTF(("RUN: error from newenv()!\n"));
3401 freearea(areanum--);
3406 /* -------- do.c -------- */
3409 * built-in commands: doX
3412 static int dohelp(struct op *t)
3415 const struct builtincmd *x;
3417 printf("\nBuilt-in commands:\n");
3418 printf("-------------------\n");
3420 for (col = 0, x = builtincmds; x->builtinfunc != NULL; x++) {
3423 col += printf("%s%s", ((col == 0) ? "\t" : " "), x->name);
3429 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3432 const struct BB_applet *applet;
3433 extern const struct BB_applet applets[];
3434 extern const size_t NUM_APPLETS;
3436 for (i = 0, applet = applets; i < NUM_APPLETS; applet++, i++) {
3440 col += printf("%s%s", ((col == 0) ? "\t" : " "), applet->name);
3449 return EXIT_SUCCESS;
3454 static int dolabel(struct op *t)
3459 static int dochdir(t)
3460 REGISTER struct op *t;
3462 REGISTER char *cp, *er;
3464 if ((cp = t->words[1]) == NULL && (cp = homedir->value) == NULL)
3465 er = ": no home directory";
3466 else if (chdir(cp) < 0)
3467 er = ": bad directory";
3470 prs(cp != NULL ? cp : "cd");
3475 static int doshift(t)
3476 REGISTER struct op *t;
3480 n = t->words[1] ? getn(t->words[1]) : 1;
3482 err("nothing to shift");
3488 setval(lookup("#"), putn(dolc));
3493 * execute login and newgrp directly
3495 static int dologin(t)
3501 signal(SIGINT, SIG_DFL);
3502 signal(SIGQUIT, SIG_DFL);
3504 cp = rexecve(t->words[0], t->words, makenv(0, NULL));
3511 static int doumask(t)
3512 REGISTER struct op *t;
3517 if ((cp = t->words[1]) == NULL) {
3520 for (n = 3 * 4; (n -= 3) >= 0;)
3521 putc('0' + ((i >> n) & 07), stderr);
3524 for (n = 0; *cp >= '0' && *cp <= '9'; cp++)
3525 n = n * 8 + (*cp - '0');
3531 static int doexec(t)
3532 REGISTER struct op *t;
3539 for (i = 0; (t->words[i] = t->words[i + 1]) != NULL; i++);
3544 if (setjmp(failpt = ex) == 0)
3545 execute(t, NOPIPE, NOPIPE, FEXEC);
3555 REGISTER char *sp, *tp;
3559 DBGPRINTF(("DODOT: enter, t=%p, tleft %p, tright %p, e.linep is %s\n", t, t->left, t->right, ((e.linep == NULL) ? "NULL" : e.linep)));
3561 if ((cp = t->words[1]) == NULL) {
3562 DBGPRINTF(("DODOT: bad args, ret 0\n"));
3565 DBGPRINTF(("DODOT: cp is %s\n", cp));
3568 sp = any('/', cp) ? ":" : path->value;
3570 DBGPRINTF(("DODOT: sp is %s, e.linep is %s\n",
3571 ((sp == NULL) ? "NULL" : sp),
3572 ((e.linep == NULL) ? "NULL" : e.linep)));
3576 while (*sp && (*tp = *sp++) != ':')
3581 for (i = 0; (*tp++ = cp[i++]) != '\0';);
3584 if ((i = open(e.linep, 0)) >= 0) {
3587 DBGPRINTF(("DODOT: remap=%d, exstat=%d, e.iofd %d, i %d, e.linep is %s\n", maltmp, exstat, e.iofd, i, e.linep));
3589 next(maltmp); /* Basically a PUSHIO */
3591 DBGPRINTF(("DODOT: returning exstat=%d\n", exstat));
3604 static int dowait(t)
3610 if ((cp = t->words[1]) != NULL) {
3616 setstatus(waitfor(i, 1));
3620 static int doread(t)
3623 REGISTER char *cp, **wp;
3624 REGISTER int nb = 0;
3625 REGISTER int nl = 0;
3627 if (t->words[1] == NULL) {
3628 err("Usage: read name ...");
3631 for (wp = t->words + 1; *wp; wp++) {
3632 for (cp = e.linep; !nl && cp < elinep - 1; cp++)
3633 if ((nb = read(0, cp, sizeof(*cp))) != sizeof(*cp) ||
3634 (nl = (*cp == '\n')) || (wp[1] && any(*cp, ifs->value)))
3639 setval(lookup(*wp), e.linep);
3644 static int doeval(t)
3645 REGISTER struct op *t;
3647 return (RUN(awordlist, t->words + 1, wdchar));
3650 static int dotrap(t)
3651 REGISTER struct op *t;
3654 REGISTER int resetsig;
3656 if (t->words[1] == NULL) {
3657 for (i = 0; i <= _NSIG; i++)
3666 resetsig = isdigit(*t->words[1]);
3667 for (i = resetsig ? 1 : 2; t->words[i] != NULL; ++i) {
3668 n = getsig(t->words[i]);
3672 if (*t->words[1] != '\0') {
3673 trap[n] = strsave(t->words[1], 0);
3682 setsig(n, n == SIGQUIT ? SIG_IGN : SIG_DFL);
3690 static int getsig(s)
3695 if ((n = getn(s)) < 0 || n > _NSIG) {
3696 err("trap: bad signal number");
3702 static void setsig(REGISTER int n, sighandler_t f)
3706 if (signal(n, SIG_IGN) != SIG_IGN || ourtrap[n]) {
3724 for (n = 0; isdigit(*s); s++)
3725 n = (n * 10) + (*s - '0');
3728 err(": bad number");
3733 static int dobreak(t)
3736 return (brkcontin(t->words[1], 1));
3739 static int docontinue(t)
3742 return (brkcontin(t->words[1], 0));
3745 static int brkcontin(cp, val)
3749 REGISTER struct brkcon *bc;
3752 nl = cp == NULL ? 1 : getn(cp);
3756 if ((bc = brklist) == NULL)
3758 brklist = bc->nextlev;
3761 err("bad break/continue level");
3765 longjmp(bc->brkpt, 1);
3769 static int doexit(t)
3775 if ((cp = t->words[1]) != NULL)
3776 setstatus(getn(cp));
3778 DBGPRINTF(("DOEXIT: calling leave(), t=%p\n", t));
3785 static int doexport(t)
3788 rdexp(t->words + 1, export, EXPORT);
3792 static int doreadonly(t)
3795 rdexp(t->words + 1, ronly, RONLY);
3799 static void rdexp(char **wp, void (*f) (struct var *), int key)
3801 DBGPRINTF6(("RDEXP: enter, wp=%p, func=%p, key=%d\n", wp, f, key));
3802 DBGPRINTF6(("RDEXP: *wp=%s\n", *wp));
3805 for (; *wp != NULL; wp++) {
3806 if (isassign(*wp)) {
3810 for (cp = *wp; *cp != '='; cp++);
3822 static void badid(s)
3826 err(": bad identifier");
3830 REGISTER struct op *t;
3832 REGISTER struct var *vp;
3836 if ((cp = t->words[1]) == NULL) {
3837 for (vp = vlist; vp; vp = vp->next)
3838 varput(vp->name, 1);
3842 /* bad: t->words++; */
3843 for (n = 0; (t->words[n] = t->words[n + 1]) != NULL; n++);
3845 flag['x'] = flag['v'] = 0;
3855 if (*cp >= 'a' && *cp <= 'z')
3862 t->words[0] = dolv[0];
3863 for (n = 1; t->words[n]; n++)
3864 setarea((char *) t->words[n], 0);
3867 setval(lookup("#"), putn(dolc));
3868 setarea((char *) (dolv - 1), 0);
3873 static void varput(s, out)
3877 if (isalnum(*s) || *s == '_') {
3878 write(out, s, strlen(s));
3879 write(out, "\n", 1);
3885 * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
3886 * This file contains code for the times builtin.
3888 static int dotimes(struct op *t)
3891 long int clk_tck = sysconf(_SC_CLK_TCK);
3894 printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
3895 (int) (buf.tms_utime / clk_tck / 60),
3896 ((double) buf.tms_utime) / clk_tck,
3897 (int) (buf.tms_stime / clk_tck / 60),
3898 ((double) buf.tms_stime) / clk_tck,
3899 (int) (buf.tms_cutime / clk_tck / 60),
3900 ((double) buf.tms_cutime) / clk_tck,
3901 (int) (buf.tms_cstime / clk_tck / 60),
3902 ((double) buf.tms_cstime) / clk_tck);
3907 static int (*inbuilt(char *s)) (struct op *) {
3908 const struct builtincmd *bp;
3910 for (bp = builtincmds; bp->name != NULL; bp++)
3911 if (strcmp(bp->name, s) == 0)
3912 return (bp->builtinfunc);
3917 /* -------- eval.c -------- */
3922 * blank interpretation
3927 static char **eval(char **ap, int f)
3935 /* Avoid longjmp clobbering */
3940 DBGPRINTF4(("EVAL: enter, f=%d\n", f));
3945 if (newenv(setjmp(errpt = ev)) == 0) {
3946 while (*ap && isassign(*ap))
3947 expand(*ap++, &wb, f & ~DOGLOB);
3949 for (wf = ap; *wf; wf++) {
3951 expand(*wf, &wb, f & ~DOGLOB);
3954 for (wb = addword((char *) 0, wb); *ap; ap++) {
3955 if (!flag['k'] || !isassign(*ap))
3956 expand(*ap, &wb, f & ~DOKEY);
3958 wb = addword((char *) 0, wb);
3964 return (gflg ? (char **) NULL : wp);
3968 * Make the exported environment from the exported
3969 * names in the dictionary. Keyword assignments
3970 * will already have been done.
3972 static char **makenv(int all, struct wdblock *wb)
3974 REGISTER struct var *vp;
3976 DBGPRINTF5(("MAKENV: enter, all=%d\n", all));
3978 for (vp = vlist; vp; vp = vp->next)
3979 if (all || vp->status & EXPORT)
3980 wb = addword(vp->name, wb);
3981 wb = addword((char *) 0, wb);
3982 return (getwords(wb));
3985 static char *evalstr(cp, f)
3991 DBGPRINTF6(("EVALSTR: enter, cp=%p, f=%d\n", cp, f));
3994 if (expand(cp, &wb, f)) {
3995 if (wb == NULL || wb->w_nword == 0
3996 || (cp = wb->w_words[0]) == NULL)
4004 static int expand(char *cp, REGISTER struct wdblock **wbp, int f)
4009 /* Avoid longjmp clobbering */
4013 DBGPRINTF3(("EXPAND: enter, f=%d\n", f));
4020 if (!anys("$`'\"", cp) &&
4021 !anys(ifs->value, cp) && ((f & DOGLOB) == 0 || !anys("[*?", cp))) {
4022 cp = strsave(cp, areanum);
4025 *wbp = addword(cp, *wbp);
4028 if (newenv(setjmp(errpt = ev)) == 0) {
4029 PUSHIO(aword, cp, strchar);
4031 while ((cp = blank(f)) && gflg == 0) {
4033 cp = strsave(cp, areanum);
4034 if ((f & DOGLOB) == 0) {
4037 *wbp = addword(cp, *wbp);
4039 *wbp = glob(cp, *wbp);
4048 * Blank interpretation and quoting
4050 static char *blank(f)
4055 int scanequals, foundequals;
4057 DBGPRINTF3(("BLANK: enter, f=%d\n", f));
4060 scanequals = f & DOKEY;
4064 switch (c = subgetc('"', foundequals)) {
4072 if (f & DOBLANK && any(c, ifs->value))
4081 for (c1 = c; (c = subgetc(c1, 1)) != c1;) {
4084 if (c == '\'' || !any(c, "$`\""))
4091 if (!isalpha(c) && c != '_')
4094 c = subgetc('"', foundequals);
4096 f & (DOBLANK && any(c, ifs->value)) ||
4097 (!INSUB() && any(c, "\"'"))) {
4108 } else if (!isalnum(c) && c != '_')
4118 * Get characters, substituting for ` and $
4120 static int subgetc(ec, quoted)
4126 DBGPRINTF3(("SUBGETC: enter, quoted=%d\n", quoted));
4130 if (!INSUB() && ec != '\'') {
4132 if (grave(quoted) == 0)
4134 e.iop->task = XGRAVE;
4137 if (c == '$' && (c = dollar(quoted)) == 0) {
4138 e.iop->task = XDOLL;
4146 * Prepare to generate the string returned by ${} substitution.
4148 static int dollar(quoted)
4154 REGISTER char *s, c, *cp = NULL;
4157 DBGPRINTF3(("DOLLAR: enter, quoted=%d\n", quoted));
4163 if (isalpha(c) || c == '_') {
4164 while ((c = readc()) != 0 && (isalnum(c) || c == '_'))
4165 if (e.linep < elinep)
4172 otask = e.iop->task;
4174 e.iop->task = XOTHER;
4175 while ((c = subgetc('"', 0)) != 0 && c != '}' && c != '\n')
4176 if (e.linep < elinep)
4179 e.iop->task = otask;
4186 if (e.linep >= elinep) {
4187 err("string in ${} too long");
4193 for (cp = s + 1; *cp; cp++)
4194 if (any(*cp, "=-+?")) {
4199 if (s[1] == 0 && (*s == '*' || *s == '@')) {
4201 /* currently this does not distinguish $* and $@ */
4202 /* should check dollar */
4204 PUSHIO(awordlist, dolv + 1, dolchar);
4206 } else { /* trap the nasty ${=} */
4212 if ((dolp = vp->value) == null) {
4216 err("cannot use ${...=...} with $n");
4225 dolp = strsave(cp, areanum);
4230 prs("missing value for ");
4237 } else if (c == '+')
4238 dolp = strsave(cp, areanum);
4239 if (flag['u'] && dolp == null) {
4240 prs("unset variable: ");
4245 PUSHIO(aword, dolp, quoted ? qstrchar : strchar);
4250 * Run the command in `...` and read its output.
4253 static int grave(quoted)
4260 static char child_cmd[LINELIM];
4266 char *argument_list[4];
4267 struct wdblock *wb = NULL;
4270 /* Avoid longjmp clobbering */
4274 for (cp = e.iop->argp->aword; *cp != '`'; cp++)
4276 err("no closing `");
4280 /* string copy with dollar expansion */
4281 src = e.iop->argp->aword;
4286 while ((*src != '`') && (count < LINELIM)) {
4291 if (*src == '$' && !ignore && !ignore_once) {
4293 char var_name[LINELIM];
4294 char alt_value[LINELIM];
4307 var_name[var_index++] = *src++;
4308 while (isalnum(*src) || *src=='_')
4309 var_name[var_index++] = *src++;
4310 var_name[var_index] = 0;
4323 err("unclosed ${\n");
4328 while (*src && (*src != '}')) {
4329 alt_value[alt_index++] = *src++;
4331 alt_value[alt_index] = 0;
4333 err("unclosed ${\n");
4340 if (isalpha(*var_name)) {
4341 /* let subshell handle it instead */
4343 char *namep = var_name;
4351 char *altp = alt_value;
4359 wb = addword(lookup(var_name)->name, wb);
4363 vp = lookup(var_name);
4364 if (vp->value != null)
4365 value = (operator == '+') ?
4366 alt_value : vp->value;
4367 else if (operator == '?') {
4370 } else if (alt_index && (operator != '+')) {
4372 if (operator == '=')
4377 while (*value && (count < LINELIM)) {
4390 if (openpipe(pf) < 0)
4393 while ((i = vfork()) == -1 && errno == EAGAIN);
4395 DBGPRINTF3(("GRAVE: i is %p\n", io));
4399 err((char *) bb_msg_memory_exhausted);
4403 waitpid(i, NULL, 0);
4404 e.iop->argp->aword = ++cp;
4406 PUSHIO(afile, remap(pf[0]),
4407 (int (*)(struct ioarg *)) ((quoted) ? qgravechar :
4411 /* allow trapped signals */
4412 /* XXX - Maybe this signal stuff should go as well? */
4413 for (j = 0; j <= _NSIG; j++)
4414 if (ourtrap[j] && signal(j, SIG_IGN) != SIG_IGN)
4420 argument_list[0] = (char *) DEFAULT_SHELL;
4421 argument_list[1] = "-c";
4422 argument_list[2] = child_cmd;
4423 argument_list[3] = 0;
4425 cp = rexecve(argument_list[0], argument_list, makenv(1, wb));
4426 prs(argument_list[0]);
4433 static char *unquote(as)
4438 if ((s = as) != NULL)
4444 /* -------- glob.c -------- */
4450 #define scopy(x) strsave((x), areanum)
4452 #define NDENT ((BLKSIZ+sizeof(struct dirent)-1)/sizeof(struct dirent))
4454 static struct wdblock *cl, *nl;
4455 static char spcl[] = "[?*";
4457 static struct wdblock *glob(cp, wb)
4467 for (pp = cp; *pp; pp++)
4470 else if (!any(*pp & ~QUOTE, spcl))
4473 for (cl = addword(scopy(cp), (struct wdblock *) 0); anyspcl(cl);
4475 nl = newword(cl->w_nword * 2);
4476 for (i = 0; i < cl->w_nword; i++) { /* for each argument */
4477 for (pp = cl->w_words[i]; *pp; pp++)
4478 if (any(*pp, spcl)) {
4479 globname(cl->w_words[i], pp);
4483 nl = addword(scopy(cl->w_words[i]), nl);
4485 for (i = 0; i < cl->w_nword; i++)
4486 DELETE(cl->w_words[i]);
4489 for (i = 0; i < cl->w_nword; i++)
4490 unquote(cl->w_words[i]);
4491 glob0((char *) cl->w_words, cl->w_nword, sizeof(char *), xstrcmp);
4493 for (i = 0; i < cl->w_nword; i++)
4494 wb = addword(cl->w_words[i], wb);
4499 wb = addword(unquote(cp), wb);
4503 static void globname(we, pp)
4507 REGISTER char *np, *cp;
4508 char *name, *gp, *dp;
4512 char dname[NAME_MAX + 1];
4515 for (np = we; np != pp; pp--)
4518 for (dp = cp = space((int) (pp - np) + 3); np < pp;)
4522 for (gp = cp = space(strlen(pp) + 1); *np && *np != '/';)
4531 dname[NAME_MAX] = '\0';
4532 while ((de = readdir(dirp)) != NULL) {
4533 /* XXX Hmmm... What this could be? (abial) */
4535 if (ent[j].d_ino == 0)
4538 strncpy(dname, de->d_name, NAME_MAX);
4539 if (dname[0] == '.')
4542 for (k = 0; k < NAME_MAX; k++)
4543 if (any(dname[k], spcl))
4545 if (gmatch(dname, gp)) {
4546 name = generate(we, pp, dname, np);
4547 if (*np && !anys(np, spcl)) {
4548 if (stat(name, &dbuf)) {
4553 nl = addword(name, nl);
4562 * generate a pathname as below.
4563 * start..end1 / middle end
4564 * the slashes come for free
4566 static char *generate(start1, end1, middle, end)
4568 REGISTER char *end1;
4572 REGISTER char *op, *xp;
4575 space((int) (end1 - start1) + strlen(middle) + strlen(end) + 2);
4576 for (xp = start1; xp != end1;)
4578 for (xp = middle; (*op++ = *xp++) != '\0';);
4580 for (xp = end; (*op++ = *xp++) != '\0';);
4584 static int anyspcl(wb)
4585 REGISTER struct wdblock *wb;
4591 for (i = 0; i < wb->w_nword; i++)
4592 if (anys(spcl, *wd++))
4597 static int xstrcmp(p1, p2)
4600 return (strcmp(*(char **) p1, *(char **) p2));
4603 /* -------- word.c -------- */
4605 static struct wdblock *newword(nw)
4608 REGISTER struct wdblock *wb;
4610 wb = (struct wdblock *) space(sizeof(*wb) + nw * sizeof(char *));
4616 static struct wdblock *addword(wd, wb)
4618 REGISTER struct wdblock *wb;
4620 REGISTER struct wdblock *wb2;
4624 wb = newword(NSTART);
4625 if ((nw = wb->w_nword) >= wb->w_bsize) {
4626 wb2 = newword(nw * 2);
4627 memcpy((char *) wb2->w_words, (char *) wb->w_words,
4628 nw * sizeof(char *));
4633 wb->w_words[wb->w_nword++] = wd;
4639 REGISTER struct wdblock *wb;
4645 return ((char **) NULL);
4646 if (wb->w_nword == 0) {
4648 return ((char **) NULL);
4650 wd = (char **) space(nb = sizeof(*wd) * wb->w_nword);
4651 memcpy((char *) wd, (char *) wb->w_words, nb);
4652 DELETE(wb); /* perhaps should done by caller */
4656 static int (*func) (char *, char *);
4659 static void glob0(a0, a1, a2, a3)
4663 int (*a3) (char *, char *);
4667 glob1(a0, a0 + a1 * a2);
4670 static void glob1(base, lim)
4673 REGISTER char *i, *j;
4683 if ((n = (int) (lim - base)) <= v2)
4685 n = v2 * (n / (2 * v2));
4686 hptr = lptr = base + n;
4691 if ((c = (*func) (i, lptr)) == 0) {
4692 glob2(i, lptr -= v2);
4703 if ((c = (*func) (hptr, j)) == 0) {
4704 glob2(hptr += v2, j);
4709 glob3(i, hptr += v2, j);
4724 if (lptr - base >= lim - hptr) {
4725 glob1(hptr + v2, lim);
4735 glob3(j, lptr -= v2, i);
4740 static void glob2(i, j)
4743 REGISTER char *index1, *index2, c;
4751 *index1++ = *index2;
4756 static void glob3(i, j, k)
4759 REGISTER char *index1, *index2, *index3;
4769 *index1++ = *index3;
4770 *index3++ = *index2;
4775 /* -------- io.c -------- */
4781 static int my_getc(int ec)
4785 if (e.linep > elinep) {
4786 while ((c = readc()) != '\n' && c);
4787 err("input line too long");
4792 if ((ec != '\'') && (ec != '`') && (e.iop->task != XGRAVE)) {
4795 if (c == '\n' && ec != '\"')
4796 return (my_getc(ec));
4803 static void unget(c)
4806 if (e.iop >= e.iobase)
4812 return e.iop < e.iobase || (e.iop->peekc == 0 && e.iop->prev == 0);
4819 RCPRINTF(("READC: e.iop %p, e.iobase %p\n", e.iop, e.iobase));
4821 for (; e.iop >= e.iobase; e.iop--) {
4822 RCPRINTF(("READC: e.iop %p, peekc 0x%x\n", e.iop, e.iop->peekc));
4823 if ((c = e.iop->peekc) != '\0') {
4827 if (e.iop->prev != 0) {
4828 if ((c = (*e.iop->iofn) (e.iop->argp, e.iop)) != '\0') {
4833 if (e.iop == iostack)
4835 return (e.iop->prev = c);
4836 } else if (e.iop->task == XIO && e.iop->prev != '\n') {
4838 if (e.iop == iostack)
4843 if (e.iop->task == XIO) {
4845 return e.iop->prev = 0;
4847 if (interactive && e.iop == iostack + 1) {
4848 #ifdef CONFIG_FEATURE_COMMAND_EDITING
4849 current_prompt = prompt->value;
4859 if (e.iop >= iostack) {
4860 RCPRINTF(("READC: return 0, e.iop %p\n", e.iop));
4864 DBGPRINTF(("READC: leave()...\n"));
4871 static void ioecho(c)
4875 write(2, &c, sizeof c);
4879 static void pushio(struct ioarg *argp, int (*fn) (struct ioarg *))
4881 DBGPRINTF(("PUSHIO: argp %p, argp->afid 0x%x, e.iop %p\n", argp,
4882 argp->afid, e.iop));
4884 /* Set env ptr for io source to next array spot and check for array overflow */
4885 if (++e.iop >= &iostack[NPUSH]) {
4887 err("Shell input nested too deeply");
4892 /* We did not overflow the NPUSH array spots so setup data structs */
4894 e.iop->iofn = (int (*)(struct ioarg *, struct io *)) fn; /* Store data source func ptr */
4896 if (argp->afid != AFID_NOBUF)
4900 e.iop->argp = ioargstack + (e.iop - iostack); /* MAL - index into stack */
4901 *e.iop->argp = *argp; /* copy data from temp area into stack spot */
4903 /* MAL - mainbuf is for 1st data source (command line?) and all nested use a single shared buffer? */
4905 if (e.iop == &iostack[0])
4906 e.iop->argp->afbuf = &mainbuf;
4908 e.iop->argp->afbuf = &sharedbuf;
4910 /* MAL - if not a termimal AND (commandline OR readable file) then give it a buffer id? */
4911 /* This line appears to be active when running scripts from command line */
4912 if ((isatty(e.iop->argp->afile) == 0)
4913 && (e.iop == &iostack[0]
4914 || lseek(e.iop->argp->afile, 0L, 1) != -1)) {
4915 if (++bufid == AFID_NOBUF) /* counter rollover check, AFID_NOBUF = 11111111 */
4916 bufid = AFID_ID; /* AFID_ID = 0 */
4918 e.iop->argp->afid = bufid; /* assign buffer id */
4921 DBGPRINTF(("PUSHIO: iostack %p, e.iop %p, afbuf %p\n",
4922 iostack, e.iop, e.iop->argp->afbuf));
4923 DBGPRINTF(("PUSHIO: mbuf %p, sbuf %p, bid %d, e.iop %p\n",
4924 &mainbuf, &sharedbuf, bufid, e.iop));
4928 e.iop->prev = ~'\n';
4933 if (fn == filechar || fn == linechar)
4935 else if (fn == (int (*)(struct ioarg *)) gravechar
4936 || fn == (int (*)(struct ioarg *)) qgravechar)
4937 e.iop->task = XGRAVE;
4939 e.iop->task = XOTHER;
4944 static struct io *setbase(ip)
4947 REGISTER struct io *xp;
4955 * Input generating functions
4959 * Produce the characters of a string, then a newline, then EOF.
4961 static int nlchar(ap)
4962 REGISTER struct ioarg *ap;
4966 if (ap->aword == NULL)
4968 if ((c = *ap->aword++) == 0) {
4976 * Given a list of words, produce the characters
4977 * in them, with a space after each word.
4979 static int wdchar(ap)
4980 REGISTER struct ioarg *ap;
4985 if ((wl = ap->awordlist) == NULL)
4988 if ((c = *(*wl)++) != 0)
4993 ap->awordlist = NULL;
4998 * Return the characters of a list of words,
4999 * producing a space between them.
5001 static int dolchar(ap)
5002 REGISTER struct ioarg *ap;
5006 if ((wp = *ap->awordlist++) != NULL) {
5007 PUSHIO(aword, wp, *ap->awordlist == NULL ? strchar : xxchar);
5013 static int xxchar(ap)
5014 REGISTER struct ioarg *ap;
5018 if (ap->aword == NULL)
5020 if ((c = *ap->aword++) == '\0') {
5028 * Produce the characters from a single word (string).
5030 static int strchar(ap)
5031 REGISTER struct ioarg *ap;
5035 if (ap->aword == NULL || (c = *ap->aword++) == 0)
5041 * Produce quoted characters from a single word (string).
5043 static int qstrchar(ap)
5044 REGISTER struct ioarg *ap;
5048 if (ap->aword == NULL || (c = *ap->aword++) == 0)
5054 * Return the characters from a file.
5056 static int filechar(ap)
5057 REGISTER struct ioarg *ap;
5061 struct iobuf *bp = ap->afbuf;
5063 if (ap->afid != AFID_NOBUF) {
5064 if ((i = ap->afid != bp->id) || bp->bufp == bp->ebufp) {
5067 lseek(ap->afile, ap->afpos, 0);
5069 i = safe_read(ap->afile, bp->buf, sizeof(bp->buf));
5077 bp->ebufp = (bp->bufp = bp->buf) + i;
5081 return *bp->bufp++ & 0177;
5083 #ifdef CONFIG_FEATURE_COMMAND_EDITING
5084 if (interactive && isatty(ap->afile)) {
5085 static char mycommand[BUFSIZ];
5086 static int position = 0, size = 0;
5088 while (size == 0 || position >= size) {
5089 cmdedit_read_input(current_prompt, mycommand);
5090 size = strlen(mycommand);
5093 c = mycommand[position];
5100 i = safe_read(ap->afile, &c, sizeof(c));
5101 return (i == sizeof(c) ? (c & 0x7f) : (closef(ap->afile), 0));
5106 * Return the characters from a here temp file.
5108 static int herechar(ap)
5109 REGISTER struct ioarg *ap;
5114 if (read(ap->afile, &c, sizeof(c)) != sizeof(c)) {
5123 * Return the characters produced by a process (`...`).
5124 * Quote them if required, and remove any trailing newline characters.
5126 static int gravechar(ap, iop)
5132 if ((c = qgravechar(ap, iop) & ~QUOTE) == '\n')
5137 static int qgravechar(ap, iop)
5138 REGISTER struct ioarg *ap;
5143 DBGPRINTF3(("QGRAVECHAR: enter, ap=%p, iop=%p\n", ap, iop));
5148 return ('\n' | QUOTE);
5152 } else if ((c = filechar(ap)) == '\n') {
5154 while ((c = filechar(ap)) == '\n')
5162 return (c != 0 ? c | QUOTE : 0);
5166 * Return a single command (usually the first line) from a file.
5168 static int linechar(ap)
5169 REGISTER struct ioarg *ap;
5173 if ((c = filechar(ap)) == '\n') {
5176 ap->afile = -1; /* illegal value */
5183 REGISTER const char *s;
5186 write(2, s, strlen(s));
5195 static void closef(i)
5202 static void closeall()
5206 for (u = NUFILE; u < NOFILE;)
5212 * remap fd into Shell's fd space
5214 static int remap(fd)
5222 DBGPRINTF(("REMAP: fd=%d, e.iofd=%d\n", fd, e.iofd));
5225 for (i = 0; i < NOFILE; i++)
5232 } while (fd >= 0 && fd < e.iofd);
5234 for (i = 0; i < NOFILE; i++)
5239 err("too many files open in shell");
5245 static int openpipe(pv)
5250 if ((i = pipe(pv)) < 0)
5251 err("can't create pipe - try again");
5255 static void closepipe(pv)
5264 /* -------- here.c -------- */
5270 static void markhere(s, iop)
5274 REGISTER struct here *h, *lh;
5276 DBGPRINTF7(("MARKHERE: enter, s=%p\n", s));
5278 h = (struct here *) space(sizeof(struct here));
5282 h->h_tag = evalstr(s, DOSUB);
5292 for (lh = inhere; lh != NULL; lh = lh->h_next)
5293 if (lh->h_next == 0) {
5297 iop->io_flag |= IOHERE | IOXHERE;
5298 for (s = h->h_tag; *s; s++)
5300 iop->io_flag &= ~IOXHERE;
5303 h->h_dosub = iop->io_flag & IOXHERE;
5306 static void gethere()
5308 REGISTER struct here *h, *hp;
5310 DBGPRINTF7(("GETHERE: enter...\n"));
5312 /* Scan here files first leaving inhere list in place */
5313 for (hp = h = inhere; h != NULL; hp = h, h = h->h_next)
5314 readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub ? 0 : '\'');
5316 /* Make inhere list active - keep list intact for scraphere */
5318 hp->h_next = acthere;
5324 static void readhere(name, s, ec)
5330 char tname[30] = ".msh_XXXXXX";
5333 char myline[LINELIM + 1];
5336 DBGPRINTF7(("READHERE: enter, name=%p, s=%p\n", name, s));
5338 tf = mkstemp(tname);
5342 *name = strsave(tname, areanum);
5343 if (newenv(setjmp(errpt = ev)) != 0)
5346 pushio(e.iop->argp, (int (*)(struct ioarg *)) e.iop->iofn);
5349 if (interactive && e.iop <= iostack) {
5350 #ifdef CONFIG_FEATURE_COMMAND_EDITING
5351 current_prompt = cprompt->value;
5353 prs(cprompt->value);
5357 while ((c = my_getc(ec)) != '\n' && c) {
5360 if (thenext >= &myline[LINELIM]) {
5367 if (strcmp(s, myline) == 0 || c == 0)
5370 write(tf, myline, (int) (thenext - myline));
5373 prs("here document `");
5383 * open here temp file.
5384 * if unquoted here, expand here temp file into second temp file.
5386 static int herein(hname, xdoll)
5394 /* Avoid longjmp clobbering */
5400 DBGPRINTF7(("HEREIN: hname is %s, xdoll=%d\n", hname, xdoll));
5402 hf = open(hname, 0);
5408 char tname[30] = ".msh_XXXXXX";
5411 tf = mkstemp(tname);
5414 if (newenv(setjmp(errpt = ev)) == 0) {
5415 PUSHIO(afile, hf, herechar);
5417 while ((c = subgetc(0, 0)) != 0) {
5419 write(tf, &c, sizeof c);
5425 tf = open(tname, 0);
5432 static void scraphere()
5434 REGISTER struct here *h;
5436 DBGPRINTF7(("SCRAPHERE: enter...\n"));
5438 for (h = inhere; h != NULL; h = h->h_next) {
5439 if (h->h_iop && h->h_iop->io_name)
5440 unlink(h->h_iop->io_name);
5445 /* unlink here temp files before a freearea(area) */
5446 static void freehere(area)
5449 REGISTER struct here *h, *hl;
5451 DBGPRINTF6(("FREEHERE: enter, area=%d\n", area));
5454 for (h = acthere; h != NULL; h = h->h_next)
5455 if (getarea((char *) h) >= area) {
5456 if (h->h_iop->io_name != NULL)
5457 unlink(h->h_iop->io_name);
5459 acthere = h->h_next;
5461 hl->h_next = h->h_next;
5469 * Copyright (c) 1987,1997, Prentice Hall
5470 * All rights reserved.
5472 * Redistribution and use of the MINIX operating system in source and
5473 * binary forms, with or without modification, are permitted provided
5474 * that the following conditions are met:
5476 * Redistributions of source code must retain the above copyright
5477 * notice, this list of conditions and the following disclaimer.
5479 * Redistributions in binary form must reproduce the above
5480 * copyright notice, this list of conditions and the following
5481 * disclaimer in the documentation and/or other materials provided
5482 * with the distribution.
5484 * Neither the name of Prentice Hall nor the names of the software
5485 * authors or contributors may be used to endorse or promote
5486 * products derived from this software without specific prior
5487 * written permission.
5489 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND
5490 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
5491 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
5492 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
5493 * IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE
5494 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
5495 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
5496 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
5497 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
5498 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
5499 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
5500 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.