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 nonblock_safe_read(fd,buf,count) read(fd,buf,count)
46 # define NOT_LONE_DASH(s) ((s)[0] != '-' || (s)[1])
47 # define LONE_CHAR(s,c) ((s)[0] == (c) && !(s)[1])
48 # define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
49 static int find_applet_by_name(const char *applet)
53 static char *utoa_to_buf(unsigned n, char *buf, unsigned buflen)
56 assert(sizeof(unsigned) == 4);
59 for (i = 1000000000; i; i /= 10) {
61 if (res || out || i == 1) {
71 static char *itoa_to_buf(int n, char *buf, unsigned buflen)
73 if (buflen && n < 0) {
78 return utoa_to_buf((unsigned)n, buf, buflen);
80 static char local_buf[12];
81 static char *itoa(int n)
83 *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
87 # include "busybox.h" /* for applet_names */
93 static int mshdbg = MSHDEBUG;
95 #define DBGPRINTF(x) if (mshdbg>0) printf x
96 #define DBGPRINTF0(x) if (mshdbg>0) printf x
97 #define DBGPRINTF1(x) if (mshdbg>1) printf x
98 #define DBGPRINTF2(x) if (mshdbg>2) printf x
99 #define DBGPRINTF3(x) if (mshdbg>3) printf x
100 #define DBGPRINTF4(x) if (mshdbg>4) printf x
101 #define DBGPRINTF5(x) if (mshdbg>5) printf x
102 #define DBGPRINTF6(x) if (mshdbg>6) printf x
103 #define DBGPRINTF7(x) if (mshdbg>7) printf x
104 #define DBGPRINTF8(x) if (mshdbg>8) printf x
105 #define DBGPRINTF9(x) if (mshdbg>9) printf x
107 static int mshdbg_rc = 0;
109 #define RCPRINTF(x) if (mshdbg_rc) printf x
114 #define DBGPRINTF0(x) ((void)0)
115 #define DBGPRINTF1(x) ((void)0)
116 #define DBGPRINTF2(x) ((void)0)
117 #define DBGPRINTF3(x) ((void)0)
118 #define DBGPRINTF4(x) ((void)0)
119 #define DBGPRINTF5(x) ((void)0)
120 #define DBGPRINTF6(x) ((void)0)
121 #define DBGPRINTF7(x) ((void)0)
122 #define DBGPRINTF8(x) ((void)0)
123 #define DBGPRINTF9(x) ((void)0)
125 #define RCPRINTF(x) ((void)0)
127 #endif /* MSHDEBUG */
130 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
131 # define DEFAULT_ROOT_PROMPT "\\u:\\w> "
132 # define DEFAULT_USER_PROMPT "\\u:\\w$ "
134 # define DEFAULT_ROOT_PROMPT "# "
135 # define DEFAULT_USER_PROMPT "$ "
139 /* -------- sh.h -------- */
145 #define NPUSH 8 /* limit to input nesting */
148 #define NOFILE 20 /* Number of open files */
149 #define NUFILE 10 /* Number of user-accessible files */
150 #define FDBASE 10 /* First file usable by Shell */
153 * values returned by wait
155 #define WAITSIG(s) ((s) & 0177)
156 #define WAITVAL(s) (((s) >> 8) & 0377)
157 #define WAITCORE(s) (((s) & 0200) != 0)
160 * library and system definitions
162 typedef void xint; /* base type of jmp_buf, for not broken compilers */
167 #define NOBLOCK ((struct op *)NULL)
168 #define NOWORD ((char *)NULL)
169 #define NOWORDS ((char **)NULL)
170 #define NOPIPE ((int *)NULL)
176 smallint io_flag; /* action (below) */
177 int io_fd; /* fd affected */
178 char *io_name; /* file name */
181 #define IOREAD 1 /* < */
182 #define IOHERE 2 /* << (here file) */
183 #define IOWRITE 4 /* > */
184 #define IOCAT 8 /* >> */
185 #define IOXHERE 16 /* ${}, ` in << */
186 #define IODUP 32 /* >&digit */
187 #define IOCLOSE 64 /* >&- */
189 #define IODEFAULT (-1) /* "default" IO fd */
193 * Description of a command or an operation on commands.
194 * Might eventually use a union.
197 smallint op_type; /* operation type, see Txxxx below */
198 char **op_words; /* arguments to a command */
199 struct ioword **ioact; /* IO actions (eg, < > >>) */
202 char *str; /* identifier for case and for */
205 #define TCOM 1 /* command */
206 #define TPAREN 2 /* (c-list) */
207 #define TPIPE 3 /* a | b */
208 #define TLIST 4 /* a [&;] b */
209 #define TOR 5 /* || */
210 #define TAND 6 /* && */
218 #define TPAT 14 /* pattern in case */
219 #define TBRACE 15 /* {c-list} */
220 #define TASYNC 16 /* c & */
221 /* Added to support "." file expansion */
224 /* Strings for names to make debug easier */
226 static const char *const T_CMD_NAMES[] = {
248 #define AREASIZE (90000)
251 * flags to control evaluation of words
253 #define DOSUB 1 /* interpret $, `, and quotes */
254 #define DOBLANK 2 /* perform blank interpretation */
255 #define DOGLOB 4 /* interpret [?* */
256 #define DOKEY 8 /* move words with `=' to 2nd arg. list */
257 #define DOTRIM 16 /* trim resulting string */
259 #define DOALL (DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM)
264 struct brkcon *nextlev;
268 static smallint trapset; /* trap pending (signal number) */
270 static smallint yynerrs; /* yacc (flag) */
272 /* moved to G: static char line[LINELIM]; */
274 #if ENABLE_FEATURE_EDITING
275 static char *current_prompt;
276 static line_input_t *line_input_state;
283 static const char *rexecve(char *c, char **v, char **envp);
284 static char *evalstr(char *cp, int f);
285 static char *putn(int n);
286 static char *unquote(char *as);
287 static int rlookup(char *n);
288 static struct wdblock *glob(char *cp, struct wdblock *wb);
289 static int my_getc(int ec);
290 static int subgetc(char ec, int quoted);
291 static char **makenv(int all, struct wdblock *wb);
292 static char **eval(char **ap, int f);
293 static int setstatus(int s);
294 static int waitfor(int lastpid, int canintr);
296 static void onintr(int s); /* SIGINT handler */
298 static int newenv(int f);
299 static void quitenv(void);
300 static void next(int f);
301 static void setdash(void);
302 static void onecommand(void);
303 static void runtrap(int i);
306 /* -------- area stuff -------- */
308 #define REGSIZE sizeof(struct region)
310 /* #define SHRINKBY (64) */
314 #define ALIGN (sizeof(int)-1)
323 /* -------- grammar stuff -------- */
348 /* Added for "." file expansion */
351 #define YYERRCODE 300
354 #define CONTIN 01 /* skip new lines to complete command */
356 static struct op *pipeline(int cf);
357 static struct op *andor(void);
358 static struct op *c_list(void);
359 static int synio(int cf);
360 static void musthave(int c, int cf);
361 static struct op *simple(void);
362 static struct op *nested(int type, int mark);
363 static struct op *command(int cf);
364 static struct op *dogroup(int onlydone);
365 static struct op *thenpart(void);
366 static struct op *elsepart(void);
367 static struct op *caselist(void);
368 static struct op *casepart(void);
369 static char **pattern(void);
370 static char **wordlist(void);
371 static struct op *list(struct op *t1, struct op *t2);
372 static struct op *block(int type, struct op *t1, struct op *t2, char **wp);
373 static struct op *newtp(void);
374 static struct op *namelist(struct op *t);
375 static char **copyw(void);
376 static void word(char *cp);
377 static struct ioword **copyio(void);
378 static struct ioword *io(int u, int f, char *cp);
379 static int yylex(int cf);
380 static int collect(int c, int c1);
381 static int dual(int c);
382 static void diag(int ec);
383 static char *tree(unsigned size);
385 /* -------- var.h -------- */
394 #define COPYV 1 /* flag to setval, suggesting copy */
395 #define RONLY 01 /* variable is read-only */
396 #define EXPORT 02 /* variable is to be exported */
397 #define GETCELL 04 /* name & value space was got with getcell */
399 static int yyparse(void);
402 /* -------- io.h -------- */
405 unsigned id; /* buffer id */
406 char buf[512]; /* buffer */
407 char *bufp; /* pointer into buffer */
408 char *ebufp; /* pointer to end of buffer */
411 /* possible arguments to an IO function */
415 int afile; /* file descriptor */
416 unsigned afid; /* buffer id */
417 off_t afpos; /* file position */
418 struct iobuf *afbuf; /* buffer for this file */
421 /* an input generator's state */
423 int (*iofn) (struct ioarg *, struct io *);
426 char prev; /* previous character read by readc() */
427 char nlcount; /* for `'s */
428 char xchar; /* for `'s */
429 char task; /* reason for pushed IO */
432 #define XOTHER 0 /* none of the below */
433 #define XDOLL 1 /* expanding ${} */
434 #define XGRAVE 2 /* expanding `'s */
435 #define XIO 3 /* file IO */
439 * input generators for IO structure
441 static int nlchar(struct ioarg *ap);
442 static int strchar(struct ioarg *ap);
443 static int qstrchar(struct ioarg *ap);
444 static int filechar(struct ioarg *ap);
445 static int herechar(struct ioarg *ap);
446 static int linechar(struct ioarg *ap);
447 static int gravechar(struct ioarg *ap, struct io *iop);
448 static int qgravechar(struct ioarg *ap, struct io *iop);
449 static int dolchar(struct ioarg *ap);
450 static int wdchar(struct ioarg *ap);
451 static void scraphere(void);
452 static void freehere(int area);
453 static void gethere(void);
454 static void markhere(char *s, struct ioword *iop);
455 static int herein(char *hname, int xdoll);
456 static int run(struct ioarg *argp, int (*f) (struct ioarg *));
459 static int eofc(void);
460 static int readc(void);
461 static void unget(int c);
462 static void ioecho(char c);
468 static void pushio(struct ioarg *argp, int (*f) (struct ioarg *));
469 #define PUSHIO(what,arg,gen) ((temparg.what = (arg)), pushio(&temparg,(gen)))
470 static int remap(int fd);
471 static int openpipe(int *pv);
472 static void closepipe(int *pv);
473 static struct io *setbase(struct io *ip);
475 /* -------- word.h -------- */
477 #define NSTART 16 /* default number of words to allow for initially */
482 /* bounds are arbitrary */
486 static struct wdblock *addword(char *wd, struct wdblock *wb);
487 static struct wdblock *newword(int nw);
488 static char **getwords(struct wdblock *wb);
490 /* -------- misc stuff -------- */
492 static int dolabel(struct op *t, char **args);
493 static int dohelp(struct op *t, char **args);
494 static int dochdir(struct op *t, char **args);
495 static int doshift(struct op *t, char **args);
496 static int dologin(struct op *t, char **args);
497 static int doumask(struct op *t, char **args);
498 static int doexec(struct op *t, char **args);
499 static int dodot(struct op *t, char **args);
500 static int dowait(struct op *t, char **args);
501 static int doread(struct op *t, char **args);
502 static int doeval(struct op *t, char **args);
503 static int dotrap(struct op *t, char **args);
504 static int dobreak(struct op *t, char **args);
505 static int doexit(struct op *t, char **args);
506 static int doexport(struct op *t, char **args);
507 static int doreadonly(struct op *t, char **args);
508 static int doset(struct op *t, char **args);
509 static int dotimes(struct op *t, char **args);
510 static int docontinue(struct op *t, char **args);
512 static int forkexec(struct op *t, int *pin, int *pout, int no_fork, char **wp);
513 static int execute(struct op *t, int *pin, int *pout, int no_fork);
514 static int iosetup(struct ioword *iop, int pipein, int pipeout);
515 static void brkset(struct brkcon *bc);
516 static int getsig(char *s);
517 static void setsig(int n, sighandler_t f);
518 static int getn(char *as);
519 static int brkcontin(char *cp, int val);
520 static void rdexp(char **wp, void (*f) (struct var *), int key);
521 static void badid(char *s);
522 static void varput(char *s, int out);
523 static int expand(const char *cp, struct wdblock **wbp, int f);
524 static char *blank(int f);
525 static int dollar(int quoted);
526 static int grave(int quoted);
527 static void globname(char *we, char *pp);
528 static char *generate(char *start1, char *end1, char *middle, char *end);
529 static int anyspcl(struct wdblock *wb);
530 static void readhere(char **name, char *s, int ec);
531 static int xxchar(struct ioarg *ap);
536 struct ioword *h_iop;
540 static const char *const signame[] = {
543 NULL, /* interrupt */
545 "Illegal instruction",
549 "Floating Point Exception",
554 NULL, /* broken pipe */
560 typedef int (*builtin_func_ptr)(struct op *, char **);
564 builtin_func_ptr builtinfunc;
567 static const struct builtincmd builtincmds[] = {
570 { "break" , dobreak },
572 { "continue", docontinue },
576 { "export" , doexport },
578 { "login" , dologin },
579 { "newgrp" , dologin },
581 { "readonly", doreadonly },
583 { "shift" , doshift },
584 { "times" , dotimes },
586 { "umask" , doumask },
591 static struct op *dowholefile(int /*, int*/);
598 static smallint gflg; /* (seems to be a parse error indicator) */
599 static smallint interactive; /* Is this an interactive shell */
600 static smallint execflg;
601 static smallint isbreak; /* "break" statement was seen */
602 static int multiline; /* '\n' changed to ';' (counter) */
603 static struct op *outtree; /* result from parser */
606 static struct brkcon *brklist;
607 static struct wdblock *wdlist;
608 static struct wdblock *iolist;
611 static struct var *mshdbg_var;
613 static struct var *vlist; /* dictionary */
614 static struct var *homedir; /* home directory */
615 static struct var *prompt; /* main prompt */
616 static struct var *cprompt; /* continuation prompt */
617 static struct var *path; /* search path for commands */
618 static struct var *shell; /* shell to interpret command files */
619 static struct var *ifs; /* field separators */
621 static int areanum; /* current allocation area */
622 static smallint intr; /* interrupt pending (bool) */
623 static smallint heedint = 1; /* heed interrupt signals (bool) */
625 static char *null = (char*)""; /* null value for variable */
626 static void (*qflag)(int) = SIG_IGN;
630 static int iounit = IODEFAULT;
631 static YYSTYPE yylval;
632 static char *elinep; /* done in main(): = line + sizeof(line) - 5 */
634 static struct here *inhere; /* list of hear docs while parsing */
635 static struct here *acthere; /* list of active here documents */
636 static struct region *areabot; /* bottom of area */
637 static struct region *areatop; /* top of area */
638 static struct region *areanxt; /* starting point of scan */
640 static void *brkaddr;
642 #define AFID_NOBUF (~0)
647 * parsing & execution environment
653 xint *errpt; /* void * */
660 struct env global_env;
661 struct ioarg temparg; // = { .afid = AFID_NOBUF }; /* temporary for PUSHIO */
662 unsigned bufid; // = AFID_ID; /* buffer id counter */
663 char ourtrap[_NSIG + 1];
664 char *trap[_NSIG + 1];
665 struct iobuf sharedbuf; /* in main(): set to { AFID_NOBUF } */
666 struct iobuf mainbuf; /* in main(): set to { AFID_NOBUF } */
667 struct ioarg ioargstack[NPUSH];
671 * -k: look for name=value everywhere on command line
673 * -t: exit after reading and executing one command
676 * -u: unset variables net diagnostic
678 char flags['z' - 'a' + 1];
679 char filechar_cmdbuf[BUFSIZ];
681 char child_cmd[LINELIM];
683 struct io iostack[NPUSH];
685 char grave__var_name[LINELIM];
686 char grave__alt_value[LINELIM];
689 #define G (*ptr_to_globals)
690 #define global_env (G.global_env )
691 #define temparg (G.temparg )
692 #define bufid (G.bufid )
693 #define ourtrap (G.ourtrap )
694 #define trap (G.trap )
695 #define sharedbuf (G.sharedbuf )
696 #define mainbuf (G.mainbuf )
697 #define ioargstack (G.ioargstack )
698 /* this looks weird, but is OK ... we index FLAG with 'a'...'z' */
699 #define FLAG (G.flags - 'a' )
700 #define filechar_cmdbuf (G.filechar_cmdbuf)
701 #define line (G.line )
702 #define child_cmd (G.child_cmd )
703 #define iostack (G.iostack )
704 #define INIT_G() do { \
705 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
706 global_env.linep = line; \
707 global_env.iobase = iostack; \
708 global_env.iop = iostack - 1; \
709 global_env.iofd = FDBASE; \
710 temparg.afid = AFID_NOBUF; \
715 /* in substitution */
716 #define INSUB() (global_env.iop->task == XGRAVE || global_env.iop->task == XDOLL)
718 #define RUN(what, arg, gen) ((temparg.what = (arg)), run(&temparg, (gen)))
721 static void print_tree(struct op *head)
724 DBGPRINTF(("PRINT_TREE: no tree\n"));
728 DBGPRINTF(("NODE: %p, left %p, right %p\n", head, head->left,
732 print_tree(head->left);
735 print_tree(head->right);
737 #endif /* MSHDEBUG */
743 static void prs(const char *s)
746 write(2, s, strlen(s));
749 static void prn(unsigned u)
754 static void echo(char **wp)
759 for (i = 0; wp[i]; i++) {
767 static void closef(int i)
773 static void closeall(void)
777 for (u = NUFILE; u < NOFILE;)
782 /* fail but return to process next command */
783 static void fail(void) ATTRIBUTE_NORETURN;
784 static void fail(void)
790 /* abort shell (or fail in subshell) */
791 static void leave(void) ATTRIBUTE_NORETURN;
792 static void leave(void)
794 DBGPRINTF(("LEAVE: leave called!\n"));
805 static void warn(const char *s)
816 static void err(const char *s)
823 if (global_env.errpt)
824 longjmp(global_env.errpt, 1);
826 global_env.iop = global_env.iobase = iostack;
830 /* -------- area.c -------- */
833 * All memory between (char *)areabot and (char *)(areatop+1) is
834 * exclusively administered by the area management routines.
835 * It is assumed that sbrk() and brk() manipulate the high end.
839 void * __q = (void *)-1; \
840 if (brkaddr + (int)(X) < brktop) { \
842 brkaddr += (int)(X); \
847 static void initarea(void)
849 brkaddr = xmalloc(AREASIZE);
850 brktop = brkaddr + AREASIZE;
852 while ((long) sbrk(0) & ALIGN)
854 areabot = (struct region *) sbrk(REGSIZE);
856 areabot->next = areabot;
857 areabot->area = BUSY;
862 static char *getcell(unsigned nbytes)
865 struct region *p, *q;
872 /* silly and defeats the algorithm */
874 * round upwards and add administration area
876 nregio = (nbytes + (REGSIZE - 1)) / REGSIZE + 1;
879 if (p->area > areanum) {
883 while ((q = p->next)->area > areanum && q != areanxt)
886 * exit loop if cell big enough
895 i = nregio >= GROWBY ? nregio : GROWBY;
896 p = (struct region *) sbrk(i * REGSIZE);
897 if (p == (struct region *) -1)
902 abort(); /* allocated areas are contiguous */
912 * we found a FREE area big enough, pointed to by 'p', and up to 'q'
914 areanxt = p + nregio;
917 * split into requested area and rest
919 if (areanxt + 1 > q) {
921 abort(); /* insufficient space left for admin */
924 areanxt->area = FREE;
928 return (char *) (p + 1);
931 static void freecell(char *cp)
935 p = (struct region *) cp;
943 #define DELETE(obj) freecell((char *)obj)
945 static void freearea(int a)
947 struct region *p, *top;
950 for (p = areabot; p != top; p = p->next)
955 static void setarea(char *cp, int a)
959 p = (struct region *) cp;
964 static int getarea(char *cp)
966 return ((struct region *) cp - 1)->area;
969 static void garbage(void)
971 struct region *p, *q, *top;
974 for (p = areabot; p != top; p = p->next) {
975 if (p->area > areanum) {
976 while ((q = p->next)->area > areanum)
982 if (areatop >= q + SHRINKBY && q->area > areanum) {
983 brk((char *) (q + 1));
991 static void *get_space(int n)
997 err("out of string space");
1001 static char *strsave(const char *s, int a)
1005 cp = get_space(strlen(s) + 1);
1007 // FIXME: I highly doubt this is good.
1016 /* -------- var.c -------- */
1018 static int eqname(const char *n1, const char *n2)
1020 for (; *n1 != '=' && *n1 != '\0'; n1++)
1023 return *n2 == '\0' || *n2 == '=';
1026 static const char *findeq(const char *cp)
1028 while (*cp != '\0' && *cp != '=')
1034 * Find the given name in the dictionary
1035 * and return its value. If the name was
1036 * not previously there, enter it now and
1037 * return a null value.
1039 static struct var *lookup(const char *n)
1041 // FIXME: dirty hack
1042 static struct var dummy;
1050 dummy.name = (char*)n;
1051 for (c = 0; isdigit(*n) && c < 1000; n++)
1052 c = c * 10 + *n - '0';
1053 dummy.status = RONLY;
1054 dummy.value = (c <= dolc ? dolv[c] : null);
1058 for (vp = vlist; vp; vp = vp->next)
1059 if (eqname(vp->name, n))
1063 vp = get_space(sizeof(*vp));
1064 if (vp == 0 || (vp->name = get_space((int) (cp - n) + 2)) == NULL) {
1065 dummy.name = dummy.value = (char*)"";
1070 while ((*xp = *n++) != '\0' && *xp != '=')
1074 setarea((char *) vp, 0);
1075 setarea((char *) vp->name, 0);
1078 vp->status = GETCELL;
1084 * if name is not NULL, it must be
1085 * a prefix of the space `val',
1087 * this is all so that exporting
1088 * values is reasonably painless.
1090 static void nameval(struct var *vp, const char *val, const char *name)
1096 if (vp->status & RONLY) {
1098 while (*xp && *xp != '=')
1099 fputc(*xp++, stderr);
1100 err(" is read-only");
1105 xp = get_space(strlen(vp->name) + strlen(val) + 2);
1108 /* make string: name=value */
1112 while ((*xp = *cp++) != '\0' && *xp != '=')
1119 if (vp->status & GETCELL)
1120 freecell(vp->name); /* form new string `name=value' */
1121 vp->name = (char*)name;
1122 vp->value = (char*)val;
1127 * give variable at `vp' the value `val'.
1129 static void setval(struct var *vp, const char *val)
1131 nameval(vp, val, NULL);
1134 static void export(struct var *vp)
1136 vp->status |= EXPORT;
1139 static void ronly(struct var *vp)
1141 if (isalpha(vp->name[0]) || vp->name[0] == '_') /* not an internal symbol */
1142 vp->status |= RONLY;
1145 static int isassign(const char *s)
1148 DBGPRINTF7(("ISASSIGN: enter, s=%s\n", s));
1151 /* no isalpha() - we shouldn't use locale */
1152 /* c | 0x20 - lowercase (Latin) letters */
1153 if (c != '_' && (unsigned)((c|0x20) - 'a') > 25)
1164 && (unsigned)(c - '0') > 9 /* not number */
1165 && (unsigned)((c|0x20) - 'a') > 25 /* not letter */
1172 static int assign(const char *s, int cf)
1177 DBGPRINTF7(("ASSIGN: enter, s=%s, cf=%d\n", s, cf));
1179 if (!isalpha(*s) && *s != '_')
1181 for (cp = s; *cp != '='; cp++)
1182 if (*cp == '\0' || (!isalnum(*cp) && *cp != '_'))
1185 nameval(vp, ++cp, cf == COPYV ? NULL : s);
1187 vp->status &= ~GETCELL;
1191 static int checkname(char *cp)
1193 DBGPRINTF7(("CHECKNAME: enter, cp=%s\n", cp));
1195 if (!isalpha(*cp++) && *(cp - 1) != '_')
1198 if (!isalnum(*cp++) && *(cp - 1) != '_')
1203 static void putvlist(int f, int out)
1207 for (vp = vlist; vp; vp = vp->next) {
1208 if (vp->status & f && (isalpha(*vp->name) || *vp->name == '_')) {
1209 if (vp->status & EXPORT)
1210 write(out, "export ", 7);
1211 if (vp->status & RONLY)
1212 write(out, "readonly ", 9);
1213 write(out, vp->name, (int) (findeq(vp->name) - vp->name));
1214 write(out, "\n", 1);
1223 static void sig(int i)
1229 static void runtrap(int i)
1234 if (trapstr == NULL)
1240 RUN(aword, trapstr, nlchar);
1244 static void setdash(void)
1248 char m['z' - 'a' + 1];
1251 for (c = 'a'; c <= 'z'; c++)
1255 setval(lookup("-"), m);
1258 static int newfile(char *s)
1262 DBGPRINTF7(("NEWFILE: opening %s\n", s));
1265 if (NOT_LONE_DASH(s)) {
1266 DBGPRINTF(("NEWFILE: s is %s\n", s));
1267 f = open(s, O_RDONLY);
1270 err(": cannot open");
1281 struct op *scantree(struct op *head)
1288 if (head->left != NULL) {
1289 dotnode = scantree(head->left);
1294 if (head->right != NULL) {
1295 dotnode = scantree(head->right);
1300 if (head->op_words == NULL)
1303 DBGPRINTF5(("SCANTREE: checking node %p\n", head));
1305 if ((head->op_type != TDOT) && LONE_CHAR(head->op_words[0], '.')) {
1306 DBGPRINTF5(("SCANTREE: dot found in node %p\n", head));
1315 static void onecommand(void)
1320 DBGPRINTF(("ONECOMMAND: enter, outtree=%p\n", outtree));
1322 while (global_env.oenv)
1331 global_env.errpt = NULL;
1332 global_env.linep = line;
1340 setjmp(failpt); /* Bruce Evans' fix */
1342 if (setjmp(failpt) || yyparse() || intr) {
1343 DBGPRINTF(("ONECOMMAND: this is not good.\n"));
1345 while (global_env.oenv)
1348 if (!interactive && intr)
1361 DBGPRINTF(("ONECOMMAND: calling execute, t=outtree=%p\n",
1363 execute(outtree, NOPIPE, NOPIPE, /* no_fork: */ 0);
1366 if (!interactive && intr) {
1378 static int newenv(int f)
1382 DBGPRINTF(("NEWENV: f=%d (indicates quitenv and return)\n", f));
1389 ep = get_space(sizeof(*ep));
1391 while (global_env.oenv)
1396 global_env.oenv = ep;
1397 global_env.errpt = errpt;
1402 static void quitenv(void)
1407 DBGPRINTF(("QUITENV: global_env.oenv=%p\n", global_env.oenv));
1409 ep = global_env.oenv;
1411 fd = global_env.iofd;
1413 /* should close `'d files */
1415 while (--fd >= global_env.iofd)
1421 * Is character c in s?
1423 static int any(int c, const char *s)
1432 * Is any character from s1 in s2?
1434 static int anys(const char *s1, const char *s2)
1442 static char *putn(int n)
1447 static void next(int f)
1449 PUSHIO(afile, f, filechar);
1452 static void onintr(int s ATTRIBUTE_UNUSED) /* ANSI C requires a parameter */
1454 signal(SIGINT, onintr);
1461 } else if (heedint) {
1468 /* -------- gmatch.c -------- */
1470 * int gmatch(string, pattern)
1471 * char *string, *pattern;
1473 * Match a pattern as in sh(1).
1478 #define QMASK (CMASK & ~QUOTE)
1479 #define NOT '!' /* might use ^ */
1481 static const char *cclass(const char *p, int sub)
1483 int c, d, not, found;
1493 if (p[1] == '-' && p[2] != ']') {
1498 if (c == sub || (c <= sub && sub <= d))
1500 } while (*++p != ']');
1501 return found ? p + 1 : NULL;
1504 static int gmatch(const char *s, const char *p)
1508 if (s == NULL || p == NULL)
1511 while ((pc = *p++ & CMASK) != '\0') {
1528 if (*p == '\0' || gmatch(s, p))
1530 } while (*s++ != '\0');
1534 if (sc != (pc & ~QUOTE))
1542 /* -------- csyn.c -------- */
1544 * shell: syntax (C version)
1547 static void yyerror(const char *s) ATTRIBUTE_NORETURN;
1548 static void yyerror(const char *s)
1551 if (interactive && global_env.iop <= iostack) {
1553 while (eofc() == 0 && yylex(0) != '\n')
1560 static void zzerr(void) ATTRIBUTE_NORETURN;
1561 static void zzerr(void)
1563 yyerror("syntax error");
1568 DBGPRINTF7(("YYPARSE: enter...\n"));
1575 return yynerrs; /* 0/1 */
1578 static struct op *pipeline(int cf)
1583 DBGPRINTF7(("PIPELINE: enter, cf=%d\n", cf));
1587 DBGPRINTF9(("PIPELINE: t=%p\n", t));
1590 while ((c = yylex(0)) == '|') {
1591 p = command(CONTIN);
1593 DBGPRINTF8(("PIPELINE: error!\n"));
1597 if (t->op_type != TPAREN && t->op_type != TCOM) {
1598 /* shell statement */
1599 t = block(TPAREN, t, NOBLOCK, NOWORDS);
1602 t = block(TPIPE, t, p, NOWORDS);
1607 DBGPRINTF7(("PIPELINE: returning t=%p\n", t));
1611 static struct op *andor(void)
1616 DBGPRINTF7(("ANDOR: enter...\n"));
1620 DBGPRINTF9(("ANDOR: t=%p\n", t));
1623 while ((c = yylex(0)) == LOGAND || c == LOGOR) {
1624 p = pipeline(CONTIN);
1626 DBGPRINTF8(("ANDOR: error!\n"));
1630 t = block(c == LOGAND ? TAND : TOR, t, p, NOWORDS);
1636 DBGPRINTF7(("ANDOR: returning t=%p\n", t));
1640 static struct op *c_list(void)
1645 DBGPRINTF7(("C_LIST: enter...\n"));
1652 t = block(TASYNC, t, NOBLOCK, NOWORDS);
1654 while ((c = yylex(0)) == ';' || c == '&'
1655 || (multiline && c == '\n')
1663 p = block(TASYNC, p, NOBLOCK, NOWORDS);
1671 DBGPRINTF7(("C_LIST: returning t=%p\n", t));
1675 static int synio(int cf)
1681 DBGPRINTF7(("SYNIO: enter, cf=%d\n", cf));
1684 if (c != '<' && c != '>') {
1691 iop = io(iounit, i, yylval.cp);
1695 markhere(yylval.cp, iop);
1697 DBGPRINTF7(("SYNIO: returning 1\n"));
1701 static void musthave(int c, int cf)
1703 peeksym = yylex(cf);
1705 DBGPRINTF7(("MUSTHAVE: error!\n"));
1712 static struct op *simple(void)
1718 switch (peeksym = yylex(0)) {
1739 static struct op *nested(int type, int mark)
1743 DBGPRINTF3(("NESTED: enter, type=%d, mark=%d\n", type, mark));
1749 return block(type, t, NOBLOCK, NOWORDS);
1752 static struct op *command(int cf)
1755 struct wdblock *iosave;
1758 DBGPRINTF(("COMMAND: enter, cf=%d\n", cf));
1784 t = nested(TPAREN, ')');
1788 t = nested(TBRACE, '}');
1798 t->op_words = wordlist();
1800 if (c != '\n' && c != ';')
1802 t->left = dogroup(0);
1810 t->op_type = (c == WHILE ? TWHILE : TUNTIL);
1812 t->right = dogroup(1);
1813 /* t->op_words = NULL; - newtp() did this */
1824 musthave(IN, CONTIN);
1827 t->left = caselist();
1838 t->right = thenpart();
1847 musthave(WORD, 0); /* gets name of file */
1848 DBGPRINTF7(("COMMAND: DOT clause, yylval.cp is %s\n", yylval.cp));
1850 word(yylval.cp); /* add word to wdlist */
1851 word(NOWORD); /* terminate wdlist */
1852 t->op_words = copyw(); /* dup wdlist */
1863 DBGPRINTF(("COMMAND: returning %p\n", t));
1868 static struct op *dowholefile(int type /*, int mark*/)
1872 DBGPRINTF(("DOWHOLEFILE: enter, type=%d\n", type /*, mark*/));
1877 t = block(type, t, NOBLOCK, NOWORDS);
1878 DBGPRINTF(("DOWHOLEFILE: return t=%p\n", t));
1882 static struct op *dogroup(int onlydone)
1888 if (c == DONE && onlydone)
1897 static struct op *thenpart(void)
1908 /*t->op_type = 0; - newtp() did this */
1910 if (t->left == NULL)
1912 t->right = elsepart();
1916 static struct op *elsepart(void)
1921 switch (c = yylex(0)) {
1932 t->right = thenpart();
1941 static struct op *caselist(void)
1946 while ((peeksym = yylex(CONTIN)) != ESAC) {
1947 DBGPRINTF(("CASELIST, doing yylex, peeksym=%d\n", peeksym));
1948 t = list(t, casepart());
1951 DBGPRINTF(("CASELIST, returning t=%p\n", t));
1955 static struct op *casepart(void)
1959 DBGPRINTF7(("CASEPART: enter...\n"));
1963 t->op_words = pattern();
1966 peeksym = yylex(CONTIN);
1967 if (peeksym != ESAC)
1968 musthave(BREAK, CONTIN);
1970 DBGPRINTF7(("CASEPART: made newtp(TPAT, t=%p)\n", t));
1975 static char **pattern(void)
1992 static char **wordlist(void)
2002 while ((c = yylex(0)) == WORD)
2010 * supporting functions
2012 static struct op *list(struct op *t1, struct op *t2)
2014 DBGPRINTF7(("LIST: enter, t1=%p, t2=%p\n", t1, t2));
2021 return block(TLIST, t1, t2, NOWORDS);
2024 static struct op *block(int type, struct op *t1, struct op *t2, char **wp)
2028 DBGPRINTF7(("BLOCK: enter, type=%d (%s)\n", type, T_CMD_NAMES[type]));
2036 DBGPRINTF7(("BLOCK: inserted %p between %p and %p\n", t, t1, t2));
2041 /* See if given string is a shell multiline (FOR, IF, etc) */
2042 static int rlookup(char *n)
2048 static const struct res restab[] = {
2071 const struct res *rp;
2073 DBGPRINTF7(("RLOOKUP: enter, n is %s\n", n));
2075 for (rp = restab; rp->r_name[0]; rp++)
2076 if (strcmp(rp->r_name, n) == 0) {
2077 DBGPRINTF7(("RLOOKUP: match, returning %d\n", rp->r_val));
2078 return rp->r_val; /* Return numeric code for shell multiline */
2081 DBGPRINTF7(("RLOOKUP: NO match, returning 0\n"));
2082 return 0; /* Not a shell multiline */
2085 static struct op *newtp(void)
2089 t = (struct op *) tree(sizeof(*t));
2090 memset(t, 0, sizeof(*t));
2092 DBGPRINTF3(("NEWTP: allocated %p\n", t));
2097 static struct op *namelist(struct op *t)
2099 DBGPRINTF7(("NAMELIST: enter, t=%p, type %s, iolist=%p\n", t,
2100 T_CMD_NAMES[t->op_type], iolist));
2103 iolist = addword((char *) NULL, iolist);
2104 t->ioact = copyio();
2108 if (t->op_type != TCOM) {
2109 if (t->op_type != TPAREN && t->ioact != NULL) {
2110 t = block(TPAREN, t, NOBLOCK, NOWORDS);
2111 t->ioact = t->left->ioact;
2112 t->left->ioact = NULL;
2118 t->op_words = copyw();
2123 static char **copyw(void)
2127 wd = getwords(wdlist);
2132 static void word(char *cp)
2134 wdlist = addword(cp, wdlist);
2137 static struct ioword **copyio(void)
2139 struct ioword **iop;
2141 iop = (struct ioword **) getwords(iolist);
2146 static struct ioword *io(int u, int f, char *cp)
2150 iop = (struct ioword *) tree(sizeof(*iop));
2154 iolist = addword((char *) iop, iolist);
2158 static int yylex(int cf)
2175 global_env.linep = line;
2178 line[LINELIM - 1] = '\0';
2181 while ((c = my_getc(0)) == ' ' || c == '\t') /* Skip whitespace */
2186 if (any(c, "0123456789")) {
2189 if (c1 == '<' || c1 == '>') {
2193 *global_env.linep++ = c;
2198 case '#': /* Comment, skip to next newline or End-of-string */
2199 while ((c = my_getc(0)) != '\0' && c != '\n')
2205 DBGPRINTF5(("YYLEX: return 0, c=%d\n", c));
2209 DBGPRINTF9(("YYLEX: found $\n"));
2210 *global_env.linep++ = c;
2213 c = collect(c, '}');
2232 /* If more chars process them, else return NULL char */
2250 if (multiline || cf & CONTIN) {
2251 if (interactive && global_env.iop <= iostack) {
2252 #if ENABLE_FEATURE_EDITING
2253 current_prompt = cprompt->value;
2255 prs(cprompt->value);
2272 while ((c = my_getc(0)) != '\0' && !any(c, "`$ '\"\t;&<>()|^\n")) {
2273 if (global_env.linep >= elinep)
2274 err("word too long");
2276 *global_env.linep++ = c;
2281 if (any(c, "\"'`$"))
2284 *global_env.linep++ = '\0';
2294 yylval.cp = strsave(line, areanum);
2299 static int collect(int c, int c1)
2303 DBGPRINTF8(("COLLECT: enter, c=%d, c1=%d\n", c, c1));
2305 *global_env.linep++ = c;
2306 while ((c = my_getc(c1)) != c1) {
2315 if (interactive && c == '\n' && global_env.iop <= iostack) {
2316 #if ENABLE_FEATURE_EDITING
2317 current_prompt = cprompt->value;
2319 prs(cprompt->value);
2322 *global_env.linep++ = c;
2325 *global_env.linep++ = c;
2327 DBGPRINTF8(("COLLECT: return 0, line is %s\n", line));
2332 /* "multiline commands" helper func */
2333 /* see if next 2 chars form a shell multiline */
2334 static int dual(int c)
2339 DBGPRINTF8(("DUAL: enter, c=%d\n", c));
2341 *cp++ = c; /* c is the given "peek" char */
2342 *cp++ = my_getc(0); /* get next char of input */
2343 *cp = '\0'; /* add EOS marker */
2345 c = rlookup(s); /* see if 2 chars form a shell multiline */
2347 unget(*--cp); /* String is not a shell multiline, put peek char back */
2349 return c; /* String is multiline, return numeric multiline (restab) code */
2352 static void diag(int ec)
2356 DBGPRINTF8(("DIAG: enter, ec=%d\n", ec));
2359 if (c == '>' || c == '<') {
2362 yylval.i = (ec == '>' ? IOWRITE | IOCAT : IOHERE);
2365 yylval.i = (ec == '>' ? IOWRITE : IOREAD);
2366 if (c != '&' || yylval.i == IOHERE)
2372 static char *tree(unsigned size)
2378 DBGPRINTF2(("TREE: getcell(%d) failed!\n", size));
2379 prs("command line too complicated\n");
2390 /* -------- exec.c -------- */
2392 static struct op **find1case(struct op *t, const char *w)
2400 DBGPRINTF3(("FIND1CASE: enter, t==NULL, returning.\n"));
2404 DBGPRINTF3(("FIND1CASE: enter, t->op_type=%d (%s)\n", t->op_type,
2405 T_CMD_NAMES[t->op_type]));
2407 if (t->op_type == TLIST) {
2408 tp = find1case(t->left, w);
2410 DBGPRINTF3(("FIND1CASE: found one to the left, returning tp=%p\n", tp));
2413 t1 = t->right; /* TPAT */
2417 for (wp = t1->op_words; *wp;) {
2418 cp = evalstr(*wp++, DOSUB);
2419 if (cp && gmatch(w, cp)) {
2420 DBGPRINTF3(("FIND1CASE: returning &t1->left= %p.\n",
2426 DBGPRINTF(("FIND1CASE: returning NULL\n"));
2430 static struct op *findcase(struct op *t, const char *w)
2434 tp = find1case(t, w);
2435 return tp != NULL ? *tp : NULL;
2442 static int execute(struct op *t, int *pin, int *pout, int no_fork)
2445 volatile int i, rv, a;
2449 struct op *outtree_save;
2453 /* Avoid longjmp clobbering */
2458 DBGPRINTF4(("EXECUTE: enter, t==null, returning.\n"));
2462 DBGPRINTF(("EXECUTE: t=%p, t->op_type=%d (%s), t->op_words is %s\n", t,
2463 t->op_type, T_CMD_NAMES[t->op_type],
2464 ((t->op_words == NULL) ? "NULL" : t->op_words[0])));
2470 ? eval(wp2, t->op_type == TCOM ? DOALL : DOALL & ~DOKEY)
2473 switch (t->op_type) {
2475 DBGPRINTF3(("EXECUTE: TDOT\n"));
2477 outtree_save = outtree;
2479 newfile(evalstr(t->op_words[0], DOALL));
2481 t->left = dowholefile(TLIST /*, 0*/);
2484 outtree = outtree_save;
2487 rv = execute(t->left, pin, pout, /* no_fork: */ 0);
2489 rv = execute(t->right, pin, pout, /* no_fork: */ 0);
2493 rv = execute(t->left, pin, pout, /* no_fork: */ 0);
2497 rv = forkexec(t, pin, pout, no_fork, wp);
2507 pv[0] = remap(pv[0]);
2508 pv[1] = remap(pv[1]);
2509 (void) execute(t->left, pin, pv, /* no_fork: */ 0);
2510 rv = execute(t->right, pv, pout, /* no_fork: */ 0);
2515 (void) execute(t->left, pin, pout, /* no_fork: */ 0);
2516 rv = execute(t->right, pin, pout, /* no_fork: */ 0);
2521 smallint hinteractive = interactive;
2523 DBGPRINTF7(("EXECUTE: TASYNC clause, calling vfork()...\n"));
2526 if (i == 0) { /* child */
2527 signal(SIGINT, SIG_IGN);
2528 signal(SIGQUIT, SIG_IGN);
2530 signal(SIGTERM, SIG_DFL);
2534 xopen(bb_dev_null, O_RDONLY);
2536 _exit(execute(t->left, pin, pout, /* no_fork: */ 1));
2538 interactive = hinteractive;
2540 setval(lookup("!"), putn(i));
2554 rv = execute(t->left, pin, pout, /* no_fork: */ 0);
2556 if (t1 != NULL && (rv == 0) == (t->op_type == TAND))
2557 rv = execute(t1, pin, pout, /* no_fork: */ 0);
2568 while (*wp++ != NULL)
2571 vp = lookup(t->str);
2572 while (setjmp(bc.brkpt))
2576 for (t1 = t->left; i-- && *wp != NULL;) {
2578 rv = execute(t1, pin, pout, /* no_fork: */ 0);
2580 brklist = brklist->nextlev;
2585 while (setjmp(bc.brkpt))
2590 while ((execute(t1, pin, pout, /* no_fork: */ 0) == 0) == (t->op_type == TWHILE))
2591 rv = execute(t->right, pin, pout, /* no_fork: */ 0);
2592 brklist = brklist->nextlev;
2597 if (t->right != NULL) {
2598 rv = !execute(t->left, pin, pout, /* no_fork: */ 0) ?
2599 execute(t->right->left, pin, pout, /* no_fork: */ 0) :
2600 execute(t->right->right, pin, pout, /* no_fork: */ 0);
2605 cp = evalstr(t->str, DOSUB | DOTRIM);
2609 DBGPRINTF7(("EXECUTE: TCASE, t->str is %s, cp is %s\n",
2610 ((t->str == NULL) ? "NULL" : t->str),
2611 ((cp == NULL) ? "NULL" : cp)));
2613 t1 = findcase(t->left, cp);
2615 DBGPRINTF7(("EXECUTE: TCASE, calling execute(t=%p, t1=%p)...\n", t, t1));
2616 rv = execute(t1, pin, pout, /* no_fork: */ 0);
2617 DBGPRINTF7(("EXECUTE: TCASE, back from execute(t=%p, t1=%p)...\n", t, t1));
2626 if (iosetup(*iopp++, pin!=NULL, pout!=NULL)) {
2634 rv = execute(t1, pin, pout, /* no_fork: */ 0);
2642 // Restoring op_words is most likely not needed now: see comment in forkexec()
2643 // (also take a look at exec builtin (doexec) - it touches t->op_words)
2649 if (interactive && intr) {
2660 DBGPRINTF(("EXECUTE: returning from t=%p, rv=%d\n", t, rv));
2664 static builtin_func_ptr inbuilt(const char *s)
2666 const struct builtincmd *bp;
2668 for (bp = builtincmds; bp->name; bp++)
2669 if (strcmp(bp->name, s) == 0)
2670 return bp->builtinfunc;
2674 static int forkexec(struct op *t, int *pin, int *pout, int no_fork, char **wp)
2678 builtin_func_ptr bltin = NULL;
2679 const char *bltin_name = NULL;
2681 struct ioword **iopp;
2689 smallint hinteractive;
2692 struct brkcon *hbrklist;
2695 /* Avoid longjmp clobbering */
2705 DBGPRINTF(("FORKEXEC: t=%p, pin %p, pout %p, no_fork %d\n", t, pin,
2707 DBGPRINTF7(("FORKEXEC: t->op_words is %s\n",
2708 ((t->op_words == NULL) ? "NULL" : t->op_words[0])));
2711 if (t->op_type == TCOM) {
2712 while (*wp++ != NULL)
2716 /* strip all initial assignments */
2717 /* FIXME: not correct wrt PATH=yyy command etc */
2719 DBGPRINTF9(("FORKEXEC: echo'ing, cp=%p, wp=%p, owp=%p\n",
2721 echo(cp ? wp : owp);
2725 if (t->ioact == NULL) {
2726 while ((cp = *owp++) != NULL && assign(cp, COPYV))
2728 DBGPRINTF(("FORKEXEC: returning setstatus(0)\n"));
2729 return setstatus(0);
2731 } else { /* cp != NULL */
2733 bltin = inbuilt(cp);
2738 // We were pointing t->op_words to temporary (expanded) arg list:
2739 // t->op_words = wp;
2740 // and restored it later (in execute()), but "break"
2741 // longjmps away (at "Run builtin" below), leaving t->op_words clobbered!
2742 // See http://bugs.busybox.net/view.php?id=846.
2743 // Now we do not touch t->op_words, but separately pass wp as param list
2745 DBGPRINTF(("FORKEXEC: bltin %p, no_fork %d, owp %p\n", bltin,
2747 /* Don't fork if it is a lone builtin (not in pipe)
2748 * OR we are told to _not_ fork */
2749 if ((!bltin || pin || pout) /* not lone bltin AND */
2750 && !no_fork /* not told to avoid fork */
2752 /* Save values in case child alters them after vfork */
2756 hinteractive = interactive;
2761 DBGPRINTF3(("FORKEXEC: calling vfork()...\n"));
2764 DBGPRINTF(("FORKEXEC: ERROR, cannot vfork()!\n"));
2768 if (newpid > 0) { /* Parent */
2769 /* Restore values */
2773 interactive = hinteractive;
2779 return (pout == NULL ? setstatus(waitfor(newpid, 0)) : 0);
2783 DBGPRINTF(("FORKEXEC: child process, bltin=%p (%s)\n", bltin, bltin_name));
2785 signal(SIGINT, SIG_IGN);
2786 signal(SIGQUIT, SIG_IGN);
2797 while ((cp = *owp++) != NULL && assign(cp, COPYV))
2801 if (pin) { /* NB: close _first_, then move fds! */
2803 xmove_fd(pin[0], 0);
2807 xmove_fd(pout[1], 1);
2812 if (bltin && bltin != doexec) {
2814 err(": cannot redirect shell command");
2820 if (iosetup(*iopp++, pin != NULL, pout != NULL)) {
2821 /* system-detected error */
2830 if (forked || pin || pout) {
2831 /* Builtin in pipe: disallowed */
2832 /* TODO: allow "exec"? */
2834 err(": cannot run builtin as part of pipe");
2840 i = setstatus(bltin(t, wp));
2843 DBGPRINTF(("FORKEXEC: returning i=%d\n", i));
2847 /* should use FIOCEXCL */
2848 for (i = FDBASE; i < NOFILE; i++)
2851 signal(SIGINT, SIG_DFL);
2852 signal(SIGQUIT, SIG_DFL);
2855 if (t->op_type == TPAREN)
2856 _exit(execute(t->left, NOPIPE, NOPIPE, /* no_fork: */ 1));
2860 cp = rexecve(wp[0], wp, makenv(0, NULL));
2867 DBGPRINTF(("FORKEXEC: calling leave(), pid=%d\n", getpid()));
2875 * 0< 1> are ignored as required
2878 static int iosetup(struct ioword *iop, int pipein, int pipeout)
2884 DBGPRINTF(("IOSETUP: iop %p, pipein %i, pipeout %i\n", iop,
2887 if (iop->io_fd == IODEFAULT) /* take default */
2888 iop->io_fd = iop->io_flag & (IOREAD | IOHERE) ? 0 : 1;
2890 if (pipein && iop->io_fd == 0)
2893 if (pipeout && iop->io_fd == 1)
2896 msg = iop->io_flag & (IOREAD | IOHERE) ? "open" : "create";
2897 if ((iop->io_flag & IOHERE) == 0) {
2898 cp = iop->io_name; /* huh?? */
2899 cp = evalstr(cp, DOSUB | DOTRIM);
2904 if (iop->io_flag & IODUP) {
2905 if (cp[1] || (!isdigit(*cp) && *cp != '-')) {
2907 err(": illegal >& argument");
2911 iop->io_flag = IOCLOSE;
2912 iop->io_flag &= ~(IOREAD | IOWRITE);
2915 switch (iop->io_flag) {
2917 u = open(cp, O_RDONLY);
2921 case IOHERE | IOXHERE:
2922 u = herein(iop->io_name, iop->io_flag & IOXHERE);
2923 cp = (char*)"here file";
2926 case IOWRITE | IOCAT:
2927 u = open(cp, O_WRONLY);
2929 lseek(u, (long) 0, SEEK_END);
2932 /* fall through to creation if >>file doesn't exist */
2935 u = creat(cp, 0666);
2939 u = dup2(*cp - '0', iop->io_fd);
2953 xmove_fd(u, iop->io_fd);
2958 * Enter a new loop level (marked for break/continue).
2960 static void brkset(struct brkcon *bc)
2962 bc->nextlev = brklist;
2967 * Wait for the last process created.
2968 * Print a message for each process found
2969 * that was killed by a signal.
2970 * Ignore interrupt signals while waiting
2971 * unless `canintr' is true.
2973 static int waitfor(int lastpid, int canintr)
2977 smallint oheedint = heedint;
2984 if (errno != EINTR || canintr)
2989 if (rv < ARRAY_SIZE(signame)) {
2990 if (signame[rv] != NULL) {
2991 if (pid != lastpid) {
2998 if (pid != lastpid) {
3007 prs(" - core dumped");
3008 if (rv >= ARRAY_SIZE(signame) || signame[rv])
3014 } while (pid != lastpid);
3029 static int setstatus(int s)
3032 setval(lookup("?"), putn(s));
3037 * PATH-searching interface to execve.
3038 * If getenv("PATH") were kept up-to-date,
3039 * execvp might be used.
3041 static const char *rexecve(char *c, char **v, char **envp)
3048 if (ENABLE_FEATURE_SH_STANDALONE) {
3049 if (find_applet_by_name(name) >= 0) {
3050 /* We have to exec here since we vforked. Running
3051 * run_applet_and_exit() won't work and bad things
3053 execve(bb_busybox_exec_path, v, envp);
3057 DBGPRINTF(("REXECVE: c=%p, v=%p, envp=%p\n", c, v, envp));
3059 sp = any('/', c) ? "" : path->value;
3060 asis = (*sp == '\0');
3061 while (asis || *sp != '\0') {
3063 tp = global_env.linep;
3064 for (; *sp != '\0'; tp++) {
3067 asis = (*sp == '\0');
3071 if (tp != global_env.linep)
3074 //for (i = 0; (*tp++ = c[i++]) != '\0';)
3077 DBGPRINTF3(("REXECVE: global_env.linep is %s\n", global_env.linep));
3079 execve(global_env.linep, v, envp);
3083 *v = global_env.linep;
3086 *v = global_env.linep;
3087 execve(DEFAULT_SHELL, v, envp);
3092 return (char *) bb_msg_memory_exhausted;
3095 return "argument list too long";
3098 return errno == ENOENT ? "not found" : "cannot execute";
3102 * Run the command produced by generator `f'
3103 * applied to stream `arg'.
3105 static int run(struct ioarg *argp, int (*f) (struct ioarg *))
3108 struct wdblock *swdlist;
3109 struct wdblock *siolist;
3115 /* Avoid longjmp clobbering */
3119 DBGPRINTF(("RUN: enter, areanum %d, outtree %p, failpt %p\n",
3120 areanum, outtree, failpt));
3130 if (newenv(setjmp(errpt)) == 0) {
3134 global_env.iobase = global_env.iop;
3137 if (setjmp(failpt) == 0 && yyparse() == 0)
3138 rv = execute(outtree, NOPIPE, NOPIPE, /* no_fork: */ 0);
3141 DBGPRINTF(("RUN: error from newenv()!\n"));
3148 freearea(areanum--);
3153 /* -------- do.c -------- */
3156 * built-in commands: doX
3159 static int dohelp(struct op *t ATTRIBUTE_UNUSED, char **args ATTRIBUTE_UNUSED)
3162 const struct builtincmd *x;
3164 puts("\nBuilt-in commands:\n"
3165 "-------------------");
3170 col += printf("%c%s", ((col == 0) ? '\t' : ' '), x->name);
3177 #if ENABLE_FEATURE_SH_STANDALONE
3179 const char *applet = applet_names;
3182 col += printf("%c%s", ((col == 0) ? '\t' : ' '), applet);
3187 applet += strlen(applet) + 1;
3192 return EXIT_SUCCESS;
3195 static int dolabel(struct op *t ATTRIBUTE_UNUSED, char **args ATTRIBUTE_UNUSED)
3200 static int dochdir(struct op *t ATTRIBUTE_UNUSED, char **args)
3202 const char *cp, *er;
3206 cp = homedir->value;
3209 er = ": no home directory";
3214 er = ": bad directory";
3216 prs(cp != NULL ? cp : "cd");
3221 static int doshift(struct op *t ATTRIBUTE_UNUSED, char **args)
3225 n = args[1] ? getn(args[1]) : 1;
3227 err("nothing to shift");
3233 setval(lookup("#"), putn(dolc));
3238 * execute login and newgrp directly
3240 static int dologin(struct op *t ATTRIBUTE_UNUSED, char **args)
3245 signal(SIGINT, SIG_DFL);
3246 signal(SIGQUIT, SIG_DFL);
3248 cp = rexecve(args[0], args, makenv(0, NULL));
3255 static int doumask(struct op *t ATTRIBUTE_UNUSED, char **args)
3264 printf("%04o\n", i);
3266 i = bb_strtou(cp, NULL, 8);
3268 err("umask: bad octal number");
3276 static int doexec(struct op *t, char **args)
3290 sv_words = t->op_words;
3291 t->op_words = args + 1;
3292 // TODO: test what will happen with "exec break" -
3293 // will it leave t->op_words pointing to garbage?
3294 // (see http://bugs.busybox.net/view.php?id=846)
3295 if (setjmp(failpt) == 0)
3296 execute(t, NOPIPE, NOPIPE, /* no_fork: */ 1);
3297 t->op_words = sv_words;
3305 static int dodot(struct op *t ATTRIBUTE_UNUSED, char **args)
3313 DBGPRINTF(("DODOT: enter, t=%p, tleft %p, tright %p, global_env.linep is %s\n",
3314 t, t->left, t->right, ((global_env.linep == NULL) ? "NULL" : global_env.linep)));
3318 DBGPRINTF(("DODOT: bad args, ret 0\n"));
3321 DBGPRINTF(("DODOT: cp is %s\n", cp));
3323 sp = any('/', cp) ? ":" : path->value;
3325 DBGPRINTF(("DODOT: sp is %s, global_env.linep is %s\n",
3326 ((sp == NULL) ? "NULL" : sp),
3327 ((global_env.linep == NULL) ? "NULL" : global_env.linep)));
3330 tp = global_env.linep;
3331 while (*sp && (*tp = *sp++) != ':')
3333 if (tp != global_env.linep)
3338 i = open(global_env.linep, O_RDONLY);
3342 DBGPRINTF(("DODOT: remap=%d, exstat=%d, global_env.iofd %d, i %d, global_env.linep is %s\n",
3343 maltmp, exstat, global_env.iofd, i, global_env.linep));
3345 next(maltmp); /* Basically a PUSHIO */
3347 DBGPRINTF(("DODOT: returning exstat=%d\n", exstat));
3359 static int dowait(struct op *t ATTRIBUTE_UNUSED, char **args)
3371 setstatus(waitfor(i, 1));
3375 static int doread(struct op *t ATTRIBUTE_UNUSED, char **args)
3381 if (args[1] == NULL) {
3382 err("Usage: read name ...");
3385 for (wp = args + 1; *wp; wp++) {
3386 for (cp = global_env.linep; !nl && cp < elinep - 1; cp++) {
3387 nb = nonblock_safe_read(0, cp, sizeof(*cp));
3388 if (nb != sizeof(*cp))
3391 if (nl || (wp[1] && any(*cp, ifs->value)))
3397 setval(lookup(*wp), global_env.linep);
3402 static int doeval(struct op *t ATTRIBUTE_UNUSED, char **args)
3404 return RUN(awordlist, args + 1, wdchar);
3407 static int dotrap(struct op *t ATTRIBUTE_UNUSED, char **args)
3412 if (args[1] == NULL) {
3413 for (i = 0; i <= _NSIG; i++)
3422 resetsig = isdigit(args[1][0]);
3423 for (i = resetsig ? 1 : 2; args[i] != NULL; ++i) {
3424 n = getsig(args[i]);
3428 if (args[1][0] != '\0') {
3429 trap[n] = strsave(args[1], 0);
3438 setsig(n, n == SIGQUIT ? SIG_IGN : SIG_DFL);
3446 static int getsig(char *s)
3451 if (n < 0 || n > _NSIG) {
3452 err("trap: bad signal number");
3458 static void setsig(int n, sighandler_t f)
3462 if (signal(n, SIG_IGN) != SIG_IGN || ourtrap[n]) {
3468 static int getn(char *as)
3479 for (n = 0; isdigit(*s); s++)
3480 n = (n * 10) + (*s - '0');
3483 err(": bad number");
3488 static int dobreak(struct op *t ATTRIBUTE_UNUSED, char **args)
3490 return brkcontin(args[1], 1);
3493 static int docontinue(struct op *t ATTRIBUTE_UNUSED, char **args)
3495 return brkcontin(args[1], 0);
3498 static int brkcontin(char *cp, int val)
3503 nl = cp == NULL ? 1 : getn(cp);
3510 brklist = bc->nextlev;
3513 err("bad break/continue level");
3516 isbreak = (val != 0);
3517 longjmp(bc->brkpt, 1);
3521 static int doexit(struct op *t ATTRIBUTE_UNUSED, char **args)
3528 setstatus(getn(cp));
3530 DBGPRINTF(("DOEXIT: calling leave(), t=%p\n", t));
3537 static int doexport(struct op *t ATTRIBUTE_UNUSED, char **args)
3539 rdexp(args + 1, export, EXPORT);
3543 static int doreadonly(struct op *t ATTRIBUTE_UNUSED, char **args)
3545 rdexp(args + 1, ronly, RONLY);
3549 static void rdexp(char **wp, void (*f) (struct var *), int key)
3551 DBGPRINTF6(("RDEXP: enter, wp=%p, func=%p, key=%d\n", wp, f, key));
3552 DBGPRINTF6(("RDEXP: *wp=%s\n", *wp));
3555 for (; *wp != NULL; wp++) {
3556 if (isassign(*wp)) {
3560 for (cp = *wp; *cp != '='; cp++)
3573 static void badid(char *s)
3576 err(": bad identifier");
3579 static int doset(struct op *t ATTRIBUTE_UNUSED, char **args)
3587 for (vp = vlist; vp; vp = vp->next)
3588 varput(vp->name, 1);
3594 FLAG['x'] = FLAG['v'] = 0;
3604 if (*cp >= 'a' && *cp <= 'z')
3614 for (n = 1; args[n]; n++)
3615 setarea((char *) args[n], 0);
3618 setval(lookup("#"), putn(dolc));
3619 setarea((char *) (dolv - 1), 0);
3624 static void varput(char *s, int out)
3626 if (isalnum(*s) || *s == '_') {
3627 write(out, s, strlen(s));
3628 write(out, "\n", 1);
3634 * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
3635 * This file contains code for the times builtin.
3637 static void times_fmt(char *buf, clock_t val, unsigned clk_tck)
3640 if (sizeof(val) > sizeof(int))
3641 sec = ((unsigned long)val) / clk_tck;
3643 sec = ((unsigned)val) / clk_tck;
3646 sprintf(buf, "%um%u.%03us", min, (sec - min * 60),
3647 /* msec: */ ((unsigned)(val - (clock_t)sec * clk_tck)) * 1000 / clk_tck
3650 sprintf(buf, "%um%us", min, (sec - min * 60));
3654 static int dotimes(struct op *t ATTRIBUTE_UNUSED, char **args ATTRIBUTE_UNUSED)
3657 unsigned clk_tck = sysconf(_SC_CLK_TCK);
3658 /* How much do we need for "NmN.NNNs" ? */
3659 enum { TIMEBUF_SIZE = sizeof(int)*3 + sizeof(int)*3 + 6 };
3660 char u[TIMEBUF_SIZE], s[TIMEBUF_SIZE];
3661 char cu[TIMEBUF_SIZE], cs[TIMEBUF_SIZE];
3665 times_fmt(u, buf.tms_utime, clk_tck);
3666 times_fmt(s, buf.tms_stime, clk_tck);
3667 times_fmt(cu, buf.tms_cutime, clk_tck);
3668 times_fmt(cs, buf.tms_cstime, clk_tck);
3670 printf("%s %s\n%s %s\n", u, s, cu, cs);
3675 /* -------- eval.c -------- */
3680 * blank interpretation
3685 static char **eval(char **ap, int f)
3693 /* Avoid longjmp clobbering */
3698 DBGPRINTF4(("EVAL: enter, f=%d\n", f));
3704 if (newenv(setjmp(errpt)) == 0) {
3705 while (*ap && isassign(*ap))
3706 expand(*ap++, &wb, f & ~DOGLOB);
3708 for (wf = ap; *wf; wf++) {
3710 expand(*wf, &wb, f & ~DOGLOB);
3713 for (wb = addword((char *) NULL, wb); *ap; ap++) {
3714 if (!FLAG['k'] || !isassign(*ap))
3715 expand(*ap, &wb, f & ~DOKEY);
3717 wb = addword((char *) 0, wb);
3723 return gflg ? (char **) NULL : wp;
3728 * Make the exported environment from the exported
3729 * names in the dictionary. Keyword assignments
3730 * will already have been done.
3732 static char **makenv(int all, struct wdblock *wb)
3736 DBGPRINTF5(("MAKENV: enter, all=%d\n", all));
3738 for (vp = vlist; vp; vp = vp->next)
3739 if (all || vp->status & EXPORT)
3740 wb = addword(vp->name, wb);
3741 wb = addword((char *) 0, wb);
3742 return getwords(wb);
3745 static int expand(const char *cp, struct wdblock **wbp, int f)
3751 /* Avoid longjmp clobbering */
3755 DBGPRINTF3(("EXPAND: enter, f=%d\n", f));
3762 if (!anys("$`'\"", cp) && !anys(ifs->value, cp)
3763 && ((f & DOGLOB) == 0 || !anys("[*?", cp))
3765 xp = strsave(cp, areanum);
3768 *wbp = addword(xp, *wbp);
3772 if (newenv(setjmp(errpt)) == 0) {
3773 PUSHIO(aword, cp, strchar);
3774 global_env.iobase = global_env.iop;
3775 while ((xp = blank(f)) && gflg == 0) {
3776 global_env.linep = xp;
3777 xp = strsave(xp, areanum);
3778 if ((f & DOGLOB) == 0) {
3781 *wbp = addword(xp, *wbp);
3783 *wbp = glob(xp, *wbp);
3791 static char *evalstr(char *cp, int f)
3795 DBGPRINTF6(("EVALSTR: enter, cp=%p, f=%d\n", cp, f));
3798 if (expand(cp, &wb, f)) {
3799 if (wb == NULL || wb->w_nword == 0
3800 || (cp = wb->w_words[0]) == NULL
3802 // TODO: I suspect that
3803 // char *evalstr(char *cp, int f) is actually
3804 // const char *evalstr(const char *cp, int f)!
3815 * Blank interpretation and quoting
3817 static char *blank(int f)
3821 int scanequals, foundequals;
3823 DBGPRINTF3(("BLANK: enter, f=%d\n", f));
3825 sp = global_env.linep;
3826 scanequals = f & DOKEY;
3830 c = subgetc('"', foundequals);
3833 if (sp == global_env.linep)
3835 *global_env.linep++ = 0;
3839 if (f & DOBLANK && any(c, ifs->value))
3848 for (c1 = c; (c = subgetc(c1, 1)) != c1;) {
3851 if (c == '\'' || !any(c, "$`\""))
3853 *global_env.linep++ = c;
3858 if (!isalpha(c) && c != '_')
3861 c = subgetc('"', foundequals);
3863 f & (DOBLANK && any(c, ifs->value)) ||
3864 (!INSUB() && any(c, "\"'"))) {
3875 } else if (!isalnum(c) && c != '_')
3878 *global_env.linep++ = c;
3880 *global_env.linep++ = 0;
3885 * Get characters, substituting for ` and $
3887 static int subgetc(char ec, int quoted)
3891 DBGPRINTF3(("SUBGETC: enter, quoted=%d\n", quoted));
3895 if (!INSUB() && ec != '\'') {
3897 if (grave(quoted) == 0)
3899 global_env.iop->task = XGRAVE;
3905 global_env.iop->task = XDOLL;
3914 * Prepare to generate the string returned by ${} substitution.
3916 static int dollar(int quoted)
3921 char *s, c, *cp = NULL;
3924 DBGPRINTF3(("DOLLAR: enter, quoted=%d\n", quoted));
3927 s = global_env.linep;
3929 *global_env.linep++ = c;
3930 if (isalpha(c) || c == '_') {
3931 while ((c = readc()) != 0 && (isalnum(c) || c == '_'))
3932 if (global_env.linep < elinep)
3933 *global_env.linep++ = c;
3938 oiop = global_env.iop;
3939 otask = global_env.iop->task;
3941 global_env.iop->task = XOTHER;
3942 while ((c = subgetc('"', 0)) != 0 && c != '}' && c != '\n')
3943 if (global_env.linep < elinep)
3944 *global_env.linep++ = c;
3945 if (oiop == global_env.iop)
3946 global_env.iop->task = otask;
3953 if (global_env.linep >= elinep) {
3954 err("string in ${} too long");
3956 global_env.linep -= 10;
3958 *global_env.linep = 0;
3960 for (cp = s + 1; *cp; cp++)
3961 if (any(*cp, "=-+?")) {
3966 if (s[1] == 0 && (*s == '*' || *s == '@')) {
3968 /* currently this does not distinguish $* and $@ */
3969 /* should check dollar */
3970 global_env.linep = s;
3971 PUSHIO(awordlist, dolv + 1, dolchar);
3973 } else { /* trap the nasty ${=} */
3984 err("cannot use ${...=...} with $n");
3993 dolp = strsave(cp, areanum);
3998 prs("missing value for ");
4005 } else if (c == '+')
4006 dolp = strsave(cp, areanum);
4007 if (FLAG['u'] && dolp == null) {
4008 prs("unset variable: ");
4012 global_env.linep = s;
4013 PUSHIO(aword, dolp, quoted ? qstrchar : strchar);
4018 * Run the command in `...` and read its output.
4021 static int grave(int quoted)
4023 /* moved to G: static char child_cmd[LINELIM]; */
4034 char *argument_list[4];
4035 struct wdblock *wb = NULL;
4038 /* Avoid longjmp clobbering */
4042 for (cp = global_env.iop->argp->aword; *cp != '`'; cp++) {
4044 err("no closing `");
4049 /* string copy with dollar expansion */
4050 src = global_env.iop->argp->aword;
4055 while ((*src != '`') && (count < LINELIM)) {
4060 if (*src == '$' && !ignore && !ignore_once) {
4062 /* moved to G to reduce stack usage
4063 char var_name[LINELIM];
4064 char alt_value[LINELIM];
4066 #define var_name (G.grave__var_name)
4067 #define alt_value (G.grave__alt_value)
4080 var_name[var_index++] = *src++;
4081 while (isalnum(*src) || *src=='_')
4082 var_name[var_index++] = *src++;
4083 var_name[var_index] = 0;
4096 err("unclosed ${\n");
4101 while (*src && (*src != '}')) {
4102 alt_value[alt_index++] = *src++;
4104 alt_value[alt_index] = 0;
4106 err("unclosed ${\n");
4113 if (isalpha(*var_name)) {
4114 /* let subshell handle it instead */
4116 char *namep = var_name;
4124 char *altp = alt_value;
4132 wb = addword(lookup(var_name)->name, wb);
4136 vp = lookup(var_name);
4137 if (vp->value != null)
4138 value = (operator == '+') ?
4139 alt_value : vp->value;
4140 else if (operator == '?') {
4143 } else if (alt_index && (operator != '+')) {
4145 if (operator == '=')
4150 while (*value && (count < LINELIM)) {
4165 if (openpipe(pf) < 0)
4168 while ((i = vfork()) == -1 && errno == EAGAIN)
4171 DBGPRINTF3(("GRAVE: i is %p\n", io));
4175 err((char *) bb_msg_memory_exhausted);
4179 waitpid(i, NULL, 0); // safe_waitpid?
4180 global_env.iop->argp->aword = ++cp;
4182 PUSHIO(afile, remap(pf[0]),
4183 (int (*)(struct ioarg *)) ((quoted) ? qgravechar : gravechar));
4186 /* allow trapped signals */
4187 /* XXX - Maybe this signal stuff should go as well? */
4188 for (j = 0; j <= _NSIG; j++)
4189 if (ourtrap[j] && signal(j, SIG_IGN) != SIG_IGN)
4192 /* Testcase where below checks are needed:
4193 * close stdout & run this script:
4201 argument_list[0] = (char *) DEFAULT_SHELL;
4202 argument_list[1] = (char *) "-c";
4203 argument_list[2] = child_cmd;
4204 argument_list[3] = NULL;
4206 cp = rexecve(argument_list[0], argument_list, makenv(1, wb));
4207 prs(argument_list[0]);
4214 static char *unquote(char *as)
4225 /* -------- glob.c -------- */
4231 #define scopy(x) strsave((x), areanum)
4233 #define NDENT ((BLKSIZ+sizeof(struct dirent)-1)/sizeof(struct dirent))
4235 static struct wdblock *cl, *nl;
4236 static const char spcl[] ALIGN1= "[?*";
4238 static struct wdblock *glob(char *cp, struct wdblock *wb)
4246 for (pp = cp; *pp; pp++)
4249 else if (!any(*pp & ~QUOTE, spcl))
4252 for (cl = addword(scopy(cp), NULL); anyspcl(cl); cl = nl) {
4253 nl = newword(cl->w_nword * 2);
4254 for (i = 0; i < cl->w_nword; i++) { /* for each argument */
4255 for (pp = cl->w_words[i]; *pp; pp++)
4256 if (any(*pp, spcl)) {
4257 globname(cl->w_words[i], pp);
4261 nl = addword(scopy(cl->w_words[i]), nl);
4263 for (i = 0; i < cl->w_nword; i++)
4264 DELETE(cl->w_words[i]);
4268 for (i = 0; i < cl->w_nword; i++)
4269 unquote(cl->w_words[i]);
4270 qsort_string_vector(cl->w_words, cl->w_nword);
4271 for (i = 0; i < cl->w_nword; i++)
4272 wb = addword(cl->w_words[i], wb);
4277 wb = addword(unquote(cp), wb);
4281 static void globname(char *we, char *pp)
4284 char *name, *gp, *dp;
4288 char dname[NAME_MAX + 1];
4291 for (np = we; np != pp; pp--)
4294 dp = cp = get_space((int) (pp - np) + 3);
4299 gp = cp = get_space(strlen(pp) + 1);
4300 while (*np && *np != '/')
4309 dname[NAME_MAX] = '\0';
4310 while ((de = readdir(dirp)) != NULL) {
4311 /* XXX Hmmm... What this could be? (abial) */
4313 if (ent[j].d_ino == 0)
4316 strncpy(dname, de->d_name, NAME_MAX);
4317 if (dname[0] == '.')
4320 for (k = 0; k < NAME_MAX; k++)
4321 if (any(dname[k], spcl))
4323 if (gmatch(dname, gp)) {
4324 name = generate(we, pp, dname, np);
4325 if (*np && !anys(np, spcl)) {
4326 if (stat(name, &dbuf)) {
4331 nl = addword(name, nl);
4340 * generate a pathname as below.
4341 * start..end1 / middle end
4342 * the slashes come for free
4344 static char *generate(char *start1, char *end1, char *middle, char *end)
4349 p = op = get_space((int)(end1 - start1) + strlen(middle) + strlen(end) + 2);
4360 static int anyspcl(struct wdblock *wb)
4366 for (i = 0; i < wb->w_nword; i++)
4367 if (anys(spcl, *wd++))
4373 /* -------- word.c -------- */
4375 static struct wdblock *newword(int nw)
4379 wb = get_space(sizeof(*wb) + nw * sizeof(char *));
4385 static struct wdblock *addword(char *wd, struct wdblock *wb)
4387 struct wdblock *wb2;
4391 wb = newword(NSTART);
4393 if (nw >= wb->w_bsize) {
4394 wb2 = newword(nw * 2);
4395 memcpy((char *) wb2->w_words, (char *) wb->w_words,
4396 nw * sizeof(char *));
4401 wb->w_words[wb->w_nword++] = wd;
4405 static char **getwords(struct wdblock *wb)
4412 if (wb->w_nword == 0) {
4416 nb = sizeof(*wd) * wb->w_nword;
4418 memcpy(wd, wb->w_words, nb);
4419 DELETE(wb); /* perhaps should done by caller */
4424 /* -------- io.c -------- */
4430 static int my_getc(int ec)
4434 if (global_env.linep > elinep) {
4435 while ((c = readc()) != '\n' && c)
4437 err("input line too long");
4442 if ((ec != '\'') && (ec != '`') && (global_env.iop->task != XGRAVE)) {
4445 if (c == '\n' && ec != '\"')
4453 static void unget(int c)
4455 if (global_env.iop >= global_env.iobase)
4456 global_env.iop->peekc = c;
4459 static int eofc(void)
4461 return global_env.iop < global_env.iobase || (global_env.iop->peekc == 0 && global_env.iop->prev == 0);
4464 static int readc(void)
4468 RCPRINTF(("READC: global_env.iop %p, global_env.iobase %p\n", global_env.iop, global_env.iobase));
4470 for (; global_env.iop >= global_env.iobase; global_env.iop--) {
4471 RCPRINTF(("READC: global_env.iop %p, peekc 0x%x\n", global_env.iop, global_env.iop->peekc));
4472 c = global_env.iop->peekc;
4474 global_env.iop->peekc = 0;
4477 if (global_env.iop->prev != 0) {
4478 c = (*global_env.iop->iofn)(global_env.iop->argp, global_env.iop);
4484 if (global_env.iop == iostack)
4486 global_env.iop->prev = c;
4489 if (global_env.iop->task == XIO && global_env.iop->prev != '\n') {
4490 global_env.iop->prev = 0;
4491 if (global_env.iop == iostack)
4496 if (global_env.iop->task == XIO) {
4498 global_env.iop->prev = 0;
4501 if (interactive && global_env.iop == iostack + 1) {
4502 #if ENABLE_FEATURE_EDITING
4503 current_prompt = prompt->value;
4511 if (global_env.iop >= iostack) {
4512 RCPRINTF(("READC: return 0, global_env.iop %p\n", global_env.iop));
4516 DBGPRINTF(("READC: leave()...\n"));
4522 static void ioecho(char c)
4525 write(2, &c, sizeof c);
4528 static void pushio(struct ioarg *argp, int (*fn) (struct ioarg *))
4530 DBGPRINTF(("PUSHIO: argp %p, argp->afid 0x%x, global_env.iop %p\n", argp,
4531 argp->afid, global_env.iop));
4533 /* Set env ptr for io source to next array spot and check for array overflow */
4534 if (++global_env.iop >= &iostack[NPUSH]) {
4536 err("Shell input nested too deeply");
4541 /* We did not overflow the NPUSH array spots so setup data structs */
4543 global_env.iop->iofn = (int (*)(struct ioarg *, struct io *)) fn; /* Store data source func ptr */
4545 if (argp->afid != AFID_NOBUF)
4546 global_env.iop->argp = argp;
4549 global_env.iop->argp = ioargstack + (global_env.iop - iostack); /* MAL - index into stack */
4550 *global_env.iop->argp = *argp; /* copy data from temp area into stack spot */
4552 /* MAL - mainbuf is for 1st data source (command line?) and all nested use a single shared buffer? */
4554 if (global_env.iop == &iostack[0])
4555 global_env.iop->argp->afbuf = &mainbuf;
4557 global_env.iop->argp->afbuf = &sharedbuf;
4559 /* MAL - if not a termimal AND (commandline OR readable file) then give it a buffer id? */
4560 /* This line appears to be active when running scripts from command line */
4561 if ((isatty(global_env.iop->argp->afile) == 0)
4562 && (global_env.iop == &iostack[0]
4563 || lseek(global_env.iop->argp->afile, 0L, SEEK_CUR) != -1)) {
4564 if (++bufid == AFID_NOBUF) /* counter rollover check, AFID_NOBUF = 11111111 */
4565 bufid = AFID_ID; /* AFID_ID = 0 */
4567 global_env.iop->argp->afid = bufid; /* assign buffer id */
4570 DBGPRINTF(("PUSHIO: iostack %p, global_env.iop %p, afbuf %p\n",
4571 iostack, global_env.iop, global_env.iop->argp->afbuf));
4572 DBGPRINTF(("PUSHIO: mbuf %p, sbuf %p, bid %d, global_env.iop %p\n",
4573 &mainbuf, &sharedbuf, bufid, global_env.iop));
4577 global_env.iop->prev = ~'\n';
4578 global_env.iop->peekc = 0;
4579 global_env.iop->xchar = 0;
4580 global_env.iop->nlcount = 0;
4582 if (fn == filechar || fn == linechar)
4583 global_env.iop->task = XIO;
4584 else if (fn == (int (*)(struct ioarg *)) gravechar
4585 || fn == (int (*)(struct ioarg *)) qgravechar)
4586 global_env.iop->task = XGRAVE;
4588 global_env.iop->task = XOTHER;
4591 static struct io *setbase(struct io *ip)
4595 xp = global_env.iobase;
4596 global_env.iobase = ip;
4601 * Input generating functions
4605 * Produce the characters of a string, then a newline, then NUL.
4607 static int nlchar(struct ioarg *ap)
4611 if (ap->aword == NULL)
4622 * Given a list of words, produce the characters
4623 * in them, with a space after each word.
4625 static int wdchar(struct ioarg *ap)
4640 ap->awordlist = NULL;
4645 * Return the characters of a list of words,
4646 * producing a space between them.
4648 static int dolchar(struct ioarg *ap)
4652 wp = *ap->awordlist++;
4654 PUSHIO(aword, wp, *ap->awordlist == NULL ? strchar : xxchar);
4660 static int xxchar(struct ioarg *ap)
4664 if (ap->aword == NULL)
4675 * Produce the characters from a single word (string).
4677 static int strchar(struct ioarg *ap)
4679 if (ap->aword == NULL)
4681 return *ap->aword++;
4685 * Produce quoted characters from a single word (string).
4687 static int qstrchar(struct ioarg *ap)
4691 if (ap->aword == NULL)
4700 * Return the characters from a file.
4702 static int filechar(struct ioarg *ap)
4706 struct iobuf *bp = ap->afbuf;
4708 if (ap->afid != AFID_NOBUF) {
4709 i = (ap->afid != bp->id);
4710 if (i || bp->bufp == bp->ebufp) {
4712 lseek(ap->afile, ap->afpos, SEEK_SET);
4714 i = nonblock_safe_read(ap->afile, bp->buf, sizeof(bp->buf));
4722 bp->ebufp = bp->bufp + i;
4726 return *bp->bufp++ & 0177;
4728 #if ENABLE_FEATURE_EDITING
4729 if (interactive && isatty(ap->afile)) {
4730 /* moved to G: static char filechar_cmdbuf[BUFSIZ]; */
4731 static int position = 0, size = 0;
4733 while (size == 0 || position >= size) {
4734 size = read_line_input(current_prompt, filechar_cmdbuf, BUFSIZ, line_input_state);
4735 if (size < 0) /* Error/EOF */
4738 /* if Ctrl-C, size == 0 and loop will repeat */
4740 c = filechar_cmdbuf[position];
4745 i = nonblock_safe_read(ap->afile, &c, sizeof(c));
4746 return i == sizeof(c) ? (c & 0x7f) : (closef(ap->afile), 0);
4750 * Return the characters from a here temp file.
4752 static int herechar(struct ioarg *ap)
4756 if (nonblock_safe_read(ap->afile, &c, sizeof(c)) != sizeof(c)) {
4764 * Return the characters produced by a process (`...`).
4765 * Quote them if required, and remove any trailing newline characters.
4767 static int gravechar(struct ioarg *ap, struct io *iop)
4771 c = qgravechar(ap, iop) & ~QUOTE;
4777 static int qgravechar(struct ioarg *ap, struct io *iop)
4781 DBGPRINTF3(("QGRAVECHAR: enter, ap=%p, iop=%p\n", ap, iop));
4786 return '\n' | QUOTE;
4790 } else if ((c = filechar(ap)) == '\n') {
4792 while ((c = filechar(ap)) == '\n')
4800 return c != 0 ? c | QUOTE : 0;
4804 * Return a single command (usually the first line) from a file.
4806 static int linechar(struct ioarg *ap)
4814 ap->afile = -1; /* illegal value */
4821 * remap fd into Shell's fd space
4823 static int remap(int fd)
4829 DBGPRINTF(("REMAP: fd=%d, global_env.iofd=%d\n", fd, global_env.iofd));
4831 if (fd < global_env.iofd) {
4832 for (i = 0; i < NOFILE; i++)
4839 } while (fd >= 0 && fd < global_env.iofd);
4841 for (i = 0; i < NOFILE; i++)
4846 err("too many files open in shell");
4852 static int openpipe(int *pv)
4858 err("can't create pipe - try again");
4862 static void closepipe(int *pv)
4871 /* -------- here.c -------- */
4877 static void markhere(char *s, struct ioword *iop)
4879 struct here *h, *lh;
4881 DBGPRINTF7(("MARKHERE: enter, s=%p\n", s));
4883 h = get_space(sizeof(struct here));
4887 h->h_tag = evalstr(s, DOSUB);
4897 for (lh = inhere; lh != NULL; lh = lh->h_next) {
4898 if (lh->h_next == 0) {
4904 iop->io_flag |= IOHERE | IOXHERE;
4905 for (s = h->h_tag; *s; s++) {
4907 iop->io_flag &= ~IOXHERE;
4911 h->h_dosub = ((iop->io_flag & IOXHERE) ? '\0' : '\'');
4914 static void gethere(void)
4916 struct here *h, *hp;
4918 DBGPRINTF7(("GETHERE: enter...\n"));
4920 /* Scan here files first leaving inhere list in place */
4921 for (hp = h = inhere; h != NULL; hp = h, h = h->h_next)
4922 readhere(&h->h_iop->io_name, h->h_tag, h->h_dosub /* NUL or ' */);
4924 /* Make inhere list active - keep list intact for scraphere */
4926 hp->h_next = acthere;
4932 static void readhere(char **name, char *s, int ec)
4935 char tname[30] = ".msh_XXXXXX";
4938 char myline[LINELIM + 1];
4941 DBGPRINTF7(("READHERE: enter, name=%p, s=%p\n", name, s));
4943 tf = mkstemp(tname);
4947 *name = strsave(tname, areanum);
4949 if (newenv(setjmp(errpt)) != 0)
4952 pushio(global_env.iop->argp, (int (*)(struct ioarg *)) global_env.iop->iofn);
4953 global_env.iobase = global_env.iop;
4955 if (interactive && global_env.iop <= iostack) {
4956 #if ENABLE_FEATURE_EDITING
4957 current_prompt = cprompt->value;
4959 prs(cprompt->value);
4963 while ((c = my_getc(ec)) != '\n' && c) {
4966 if (thenext >= &myline[LINELIM]) {
4973 if (strcmp(s, myline) == 0 || c == 0)
4976 write(tf, myline, (int) (thenext - myline));
4979 prs("here document `");
4989 * open here temp file.
4990 * if unquoted here, expand here temp file into second temp file.
4992 static int herein(char *hname, int xdoll)
4998 /* Avoid longjmp clobbering */
5004 DBGPRINTF7(("HEREIN: hname is %s, xdoll=%d\n", hname, xdoll));
5006 hf = open(hname, O_RDONLY);
5012 char tname[30] = ".msh_XXXXXX";
5015 tf = mkstemp(tname);
5019 if (newenv(setjmp(errpt)) == 0) {
5020 PUSHIO(afile, hf, herechar);
5021 setbase(global_env.iop);
5022 while ((c = subgetc(0, 0)) != 0) {
5024 write(tf, &c, sizeof c);
5030 tf = open(tname, O_RDONLY);
5037 static void scraphere(void)
5041 DBGPRINTF7(("SCRAPHERE: enter...\n"));
5043 for (h = inhere; h != NULL; h = h->h_next) {
5044 if (h->h_iop && h->h_iop->io_name)
5045 unlink(h->h_iop->io_name);
5050 /* unlink here temp files before a freearea(area) */
5051 static void freehere(int area)
5053 struct here *h, *hl;
5055 DBGPRINTF6(("FREEHERE: enter, area=%d\n", area));
5058 for (h = acthere; h != NULL; h = h->h_next) {
5059 if (getarea((char *) h) >= area) {
5060 if (h->h_iop->io_name != NULL)
5061 unlink(h->h_iop->io_name);
5063 acthere = h->h_next;
5065 hl->h_next = h->h_next;
5073 /* -------- sh.c -------- */
5078 int msh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
5079 int msh_main(int argc, char **argv)
5085 int (*iof) (struct ioarg *);
5089 sharedbuf.id = AFID_NOBUF;
5090 mainbuf.id = AFID_NOBUF;
5091 elinep = line + sizeof(line) - 5;
5093 #if ENABLE_FEATURE_EDITING
5094 line_input_state = new_line_input_t(FOR_SHELL);
5097 DBGPRINTF(("MSH_MAIN: argc %d, environ %p\n", argc, environ));
5103 assign(*ap++, !COPYV);
5104 for (ap = environ; *ap;)
5105 export(lookup(*ap++));
5110 shell = lookup("SHELL");
5111 if (shell->value == null)
5112 setval(shell, (char *)DEFAULT_SHELL);
5115 homedir = lookup("HOME");
5116 if (homedir->value == null)
5117 setval(homedir, "/");
5120 setval(lookup("$"), putn(getpid()));
5122 path = lookup("PATH");
5123 if (path->value == null) {
5124 /* Can be merged with same string elsewhere in bbox */
5126 setval(path, bb_default_root_path);
5128 setval(path, bb_default_path);
5132 ifs = lookup("IFS");
5133 if (ifs->value == null)
5134 setval(ifs, " \t\n");
5137 mshdbg_var = lookup("MSHDEBUG");
5138 if (mshdbg_var->value == null)
5139 setval(mshdbg_var, "0");
5142 prompt = lookup("PS1");
5143 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
5144 if (prompt->value == null)
5146 setval(prompt, DEFAULT_USER_PROMPT);
5147 if (geteuid() == 0) {
5148 setval(prompt, DEFAULT_ROOT_PROMPT);
5149 prompt->status &= ~EXPORT;
5151 cprompt = lookup("PS2");
5152 #if ENABLE_FEATURE_EDITING_FANCY_PROMPT
5153 if (cprompt->value == null)
5155 setval(cprompt, "> ");
5161 if (argv[0][0] == '-' && argv[0][1] != '\0') {
5162 for (s = argv[0] + 1; *s; s++)
5165 prompt->status &= ~EXPORT;
5166 cprompt->status &= ~EXPORT;
5168 setval(cprompt, "");
5171 PUSHIO(aword, *++argv, iof = nlchar);
5179 /* standard input */
5183 prompt->status &= ~EXPORT;
5191 if (*s >= 'a' && *s <= 'z')
5199 if (iof == filechar && --argc > 0) {
5201 setval(cprompt, "");
5202 prompt->status &= ~EXPORT;
5203 cprompt->status &= ~EXPORT;
5205 /* Shell is non-interactive, activate printf-based debug */
5207 mshdbg = (int) (((char) (mshdbg_var->value[0])) - '0');
5211 DBGPRINTF(("MSH_MAIN: calling newfile()\n"));
5215 exit(1); /* Exit on error */
5221 /* This won't be true if PUSHIO has been called, say from newfile() above */
5222 if (global_env.iop < iostack) {
5223 PUSHIO(afile, 0, iof);
5224 if (isatty(0) && isatty(1) && !cflag) {
5226 #if !ENABLE_FEATURE_SH_EXTRA_QUIET
5228 printf("\n\n%s built-in shell (msh with debug)\n", bb_banner);
5230 printf("\n\n%s built-in shell (msh)\n", bb_banner);
5232 printf("Enter 'help' for a list of built-in commands.\n\n");
5237 signal(SIGQUIT, qflag);
5238 if (name && name[0] == '-') {
5240 f = open(".profile", O_RDONLY);
5243 f = open("/etc/profile", O_RDONLY);
5248 signal(SIGTERM, sig);
5250 if (signal(SIGINT, SIG_IGN) != SIG_IGN)
5251 signal(SIGINT, onintr);
5253 /* Handle "msh SCRIPT VAR=val params..." */
5254 /* Disabled: bash does not do it! */
5257 /* skip leading args of the form VAR=val */
5258 while (*argv && assign(*argv, !COPYV)) {
5268 setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc));
5270 DBGPRINTF(("MSH_MAIN: begin FOR loop, interactive %d, global_env.iop %p, iostack %p\n", interactive, global_env.iop, iostack));
5273 if (interactive && global_env.iop <= iostack) {
5274 #if ENABLE_FEATURE_EDITING
5275 current_prompt = prompt->value;
5281 /* Ensure that getenv("PATH") stays current */
5282 setenv("PATH", path->value, 1);
5285 DBGPRINTF(("MSH_MAIN: returning.\n"));
5290 * Copyright (c) 1987,1997, Prentice Hall
5291 * All rights reserved.
5293 * Redistribution and use of the MINIX operating system in source and
5294 * binary forms, with or without modification, are permitted provided
5295 * that the following conditions are met:
5297 * Redistributions of source code must retain the above copyright
5298 * notice, this list of conditions and the following disclaimer.
5300 * Redistributions in binary form must reproduce the above
5301 * copyright notice, this list of conditions and the following
5302 * disclaimer in the documentation and/or other materials provided
5303 * with the distribution.
5305 * Neither the name of Prentice Hall nor the names of the software
5306 * authors or contributors may be used to endorse or promote
5307 * products derived from this software without specific prior
5308 * written permission.
5310 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS, AUTHORS, AND
5311 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
5312 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
5313 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
5314 * IN NO EVENT SHALL PRENTICE HALL OR ANY AUTHORS OR CONTRIBUTORS BE
5315 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
5316 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
5317 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
5318 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
5319 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
5320 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
5321 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.