1 /* vi: set sw=4 ts=4: */
3 * ash shell port for busybox
5 * Copyright (c) 1989, 1991, 1993, 1994
6 * The Regents of the University of California. All rights reserved.
8 * This code is derived from software contributed to Berkeley by
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 * This version of ash is adapted from the source in Debian's ash 0.3.8-5
28 * Modified by Erik Andersen <andersee@debian.org> and
29 * Vladimir Oleynik <dzo@simtreas.ru> to be used in busybox
32 * Original copyright notice is retained at the end of this file.
36 /* These defines allow you to adjust the feature set to be compiled
37 * into the ash shell. As a rule, enabling these options will make
38 * ash get bigger... With all of these options off, ash adds about
39 * 60k to busybox on an x86 system.*/
42 /* Enable job control. This allows you to run jobs in the background,
43 * which is great when ash is being used as an interactive shell, but
44 * it completely useless for is all you are doing is running scripts.
45 * This adds about 2.5k on an x86 system. */
48 /* This enables alias support in ash. If you want to support things
49 * like "alias ls='ls -l'" with ash, enable this. This is only useful
50 * when ash is used as an intractive shell. This adds about 1.5k */
53 /* If you need ash to act as a full Posix shell, with full math
54 * support, enable this. This adds a bit over 2k an x86 system. */
55 //#undef ASH_MATH_SUPPORT
56 #define ASH_MATH_SUPPORT
58 /* Getopts is used by shell procedures to parse positional parameters.
59 * You probably want to leave this disabled, and use the busybox getopt
60 * applet if you want to do this sort of thing. There are some scripts
61 * out there that use it, so it you need it, enable. Most people will
62 * leave this disabled. This adds 1k on an x86 system. */
65 /* This allows you to override shell builtins and use whatever is on
66 * the filesystem. This is most useful when ash is acting as a
67 * standalone shell. Adds about 272 bytes. */
71 /* Optimize size vs speed as size */
72 #define ASH_OPTIMIZE_FOR_SIZE
74 /* Enable this to compile in extra debugging noise. When debugging is
75 * on, debugging info will be written to $HOME/trace and a quit signal
76 * will generate a core dump. */
79 /* These are here to work with glibc -- Don't change these... */
100 #include <sys/stat.h>
101 #include <sys/cdefs.h>
102 #include <sys/ioctl.h>
103 #include <sys/param.h>
104 #include <sys/resource.h>
105 #include <sys/time.h>
106 #include <sys/times.h>
107 #include <sys/types.h>
108 #include <sys/wait.h>
111 #if !defined(FNMATCH_BROKEN)
114 #if !defined(GLOB_BROKEN)
126 * This file was generated by the mksyntax program.
130 #define CWORD 0 /* character is nothing special */
131 #define CNL 1 /* newline character */
132 #define CBACK 2 /* a backslash character */
133 #define CSQUOTE 3 /* single quote */
134 #define CDQUOTE 4 /* double quote */
135 #define CENDQUOTE 5 /* a terminating quote */
136 #define CBQUOTE 6 /* backwards single quote */
137 #define CVAR 7 /* a dollar sign */
138 #define CENDVAR 8 /* a '}' character */
139 #define CLP 9 /* a left paren in arithmetic */
140 #define CRP 10 /* a right paren in arithmetic */
141 #define CENDFILE 11 /* end of file */
142 #define CCTL 12 /* like CWORD, except it must be escaped */
143 #define CSPCL 13 /* these terminate a word */
144 #define CIGN 14 /* character should be ignored */
164 #define TENDBQUOTE 13
184 /* control characters in argument strings */
185 #define CTLESC '\201'
186 #define CTLVAR '\202'
187 #define CTLENDVAR '\203'
188 #define CTLBACKQ '\204'
189 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
190 /* CTLBACKQ | CTLQUOTE == '\205' */
191 #define CTLARI '\206'
192 #define CTLENDARI '\207'
193 #define CTLQUOTEMARK '\210'
196 #define is_digit(c) ((c)>='0' && (c)<='9')
197 #define is_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalpha((unsigned char) (c))))
198 #define is_in_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalnum((unsigned char) (c))))
201 * is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
202 * (assuming ascii char codes, as the original implementation did)
204 #define is_special(c) \
205 ( (((unsigned int)c) - 33 < 32) \
206 && ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1))
208 #define digit_val(c) ((c) - '0')
211 #define _DIAGASSERT(x)
215 #define S_DFL 1 /* default signal handling (SIG_DFL) */
216 #define S_CATCH 2 /* signal is caught */
217 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
218 #define S_HARD_IGN 4 /* signal is ignored permenantly */
219 #define S_RESET 5 /* temporary - to reset a hard ignored sig */
222 /* variable substitution byte (follows CTLVAR) */
223 #define VSTYPE 0x0f /* type of variable substitution */
224 #define VSNUL 0x10 /* colon--treat the empty string as unset */
225 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
227 /* values of VSTYPE field */
228 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
229 #define VSMINUS 0x2 /* ${var-text} */
230 #define VSPLUS 0x3 /* ${var+text} */
231 #define VSQUESTION 0x4 /* ${var?message} */
232 #define VSASSIGN 0x5 /* ${var=text} */
233 #define VSTRIMLEFT 0x6 /* ${var#pattern} */
234 #define VSTRIMLEFTMAX 0x7 /* ${var##pattern} */
235 #define VSTRIMRIGHT 0x8 /* ${var%pattern} */
236 #define VSTRIMRIGHTMAX 0x9 /* ${var%%pattern} */
237 #define VSLENGTH 0xa /* ${#var} */
239 /* flags passed to redirect */
240 #define REDIR_PUSH 01 /* save previous values of file descriptors */
241 #define REDIR_BACKQ 02 /* save the command output to pipe */
244 * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
245 * so we use _setjmp instead.
249 #define setjmp(jmploc) _setjmp(jmploc)
250 #define longjmp(jmploc, val) _longjmp(jmploc, val)
254 * Most machines require the value returned from malloc to be aligned
255 * in some way. The following macro will get this right on many machines.
264 #define ALIGN(nbytes) (((nbytes) + sizeof(union align) - 1) & ~(sizeof(union align) - 1))
267 #ifdef BB_LOCALE_SUPPORT
269 static void change_lc_all(const char *value);
270 static void change_lc_ctype(const char *value);
274 * These macros allow the user to suspend the handling of interrupt signals
275 * over a period of time. This is similar to SIGHOLD to or sigblock, but
276 * much more efficient and portable. (But hacking the kernel is so much
277 * more fun than worrying about efficiency and portability. :-))
280 static void onint (void);
281 static volatile int suppressint;
282 static volatile int intpending;
284 #define INTOFF suppressint++
285 #ifndef ASH_OPTIMIZE_FOR_SIZE
286 #define INTON { if (--suppressint == 0 && intpending) onint(); }
287 #define FORCEINTON {suppressint = 0; if (intpending) onint();}
289 static void __inton (void);
290 static void forceinton (void);
291 #define INTON __inton()
292 #define FORCEINTON forceinton()
295 #define CLEAR_PENDING_INT intpending = 0
296 #define int_pending() intpending
299 typedef void *pointer;
301 #define NULL (void *)0
304 static inline pointer ckmalloc (int sz) { return xmalloc(sz); }
305 static inline pointer ckrealloc(void *p, int sz) { return xrealloc(p, sz); }
306 static inline char * savestr (const char *s) { return xstrdup(s); }
308 static pointer stalloc (int);
309 static void stunalloc (pointer);
310 static void ungrabstackstr (char *, char *);
311 static char * growstackstr(void);
312 static char * makestrspace(size_t newlen);
313 static char *sstrdup (const char *);
316 * Parse trees for commands are allocated in lifo order, so we use a stack
317 * to make this more efficient, and also to avoid all sorts of exception
318 * handling code to handle interrupts in the middle of a parse.
320 * The size 504 was chosen because the Ultrix malloc handles that size
324 #define MINSIZE 504 /* minimum size of a block */
328 struct stack_block *prev;
332 static struct stack_block stackbase;
333 static struct stack_block *stackp = &stackbase;
334 static struct stackmark *markp;
335 static char *stacknxt = stackbase.space;
336 static int stacknleft = MINSIZE;
339 #define equal(s1, s2) (strcmp(s1, s2) == 0)
341 #define stackblock() stacknxt
342 #define stackblocksize() stacknleft
343 #define STARTSTACKSTR(p) p = stackblock(), sstrnleft = stackblocksize()
345 #define STPUTC(c, p) (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
346 #define CHECKSTRSPACE(n, p) { if (sstrnleft < n) p = makestrspace(n); }
347 #define STACKSTRNUL(p) (sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
350 #define USTPUTC(c, p) (--sstrnleft, *p++ = (c))
351 #define STUNPUTC(p) (++sstrnleft, --p)
352 #define STTOPC(p) p[-1]
353 #define STADJUST(amount, p) (p += (amount), sstrnleft -= (amount))
354 #define grabstackstr(p) stalloc(stackblocksize() - sstrnleft)
356 #define ckfree(p) free((pointer)(p))
360 #define TRACE(param) trace param
361 static void trace (const char *, ...);
362 static void trargs (char **);
363 static void showtree (union node *);
364 static void trputc (int);
365 static void trputs (const char *);
366 static void opentrace (void);
401 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
402 #define EXP_TILDE 0x2 /* do normal tilde expansion */
403 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
404 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
405 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
406 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
411 static char optet_vals[NOPTS];
413 static const char * const optlist[NOPTS] = {
432 #define optent_name(optent) (optent+1)
433 #define optent_letter(optent) optent[0]
434 #define optent_val(optent) optet_vals[optent]
436 #define eflag optent_val(0)
437 #define fflag optent_val(1)
438 #define Iflag optent_val(2)
439 #define iflag optent_val(3)
440 #define mflag optent_val(4)
441 #define nflag optent_val(5)
442 #define sflag optent_val(6)
443 #define xflag optent_val(7)
444 #define vflag optent_val(8)
445 #define Vflag optent_val(9)
446 #define Eflag optent_val(10)
447 #define Cflag optent_val(11)
448 #define aflag optent_val(12)
449 #define bflag optent_val(13)
450 #define uflag optent_val(14)
451 #define qflag optent_val(15)
454 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
472 union node *redirect;
479 struct nodelist *cmdlist;
486 union node *redirect;
494 union node *elsepart;
525 struct nodelist *backquote;
563 struct nbinary nbinary;
566 struct nredir nredir;
570 struct nclist nclist;
580 struct nodelist *next;
584 struct backcmd { /* result of evalbackcmd */
585 int fd; /* file descriptor to read from */
586 char *buf; /* buffer */
587 int nleft; /* number of chars in buffer */
588 struct job *jp; /* job structure for command */
596 const struct builtincmd *cmd;
601 struct strlist *next;
607 struct strlist *list;
608 struct strlist **lastp;
612 struct strpush *prev; /* preceding string on stack */
616 struct alias *ap; /* if push was associated with an alias */
618 char *string; /* remember the string since it may change */
622 struct parsefile *prev; /* preceding file on stack */
623 int linno; /* current line */
624 int fd; /* file descriptor (or -1 if string) */
625 int nleft; /* number of chars left in this line */
626 int lleft; /* number of chars left in this buffer */
627 char *nextc; /* next char in buffer */
628 char *buf; /* input buffer */
629 struct strpush *strpush; /* for pushing strings at this level */
630 struct strpush basestrpush; /* so pushing one is fast */
634 struct stack_block *stackp;
637 struct stackmark *marknext;
641 int nparam; /* # of positional parameters (without $0) */
642 unsigned char malloc; /* if parameter list dynamically allocated */
643 char **p; /* parameter list */
644 int optind; /* next parameter to be processed by getopts */
645 int optoff; /* used by getopts */
649 * When commands are first encountered, they are entered in a hash table.
650 * This ensures that a full path search will not have to be done for them
651 * on each invocation.
653 * We should investigate converting to a linear search, even though that
654 * would make the command name "hash" a misnomer.
656 #define CMDTABLESIZE 31 /* should be prime */
657 #define ARB 1 /* actual size determined at run time */
662 struct tblentry *next; /* next entry in hash chain */
663 union param param; /* definition of builtin function */
664 short cmdtype; /* index identifying command */
665 char rehash; /* if set, cd done since entry created */
666 char cmdname[ARB]; /* name of command */
670 static struct tblentry *cmdtable[CMDTABLESIZE];
671 static int builtinloc = -1; /* index in path of %builtin, or -1 */
672 static int exerrno = 0; /* Last exec error */
675 static void tryexec (char *, char **, char **);
676 static void printentry (struct tblentry *, int);
677 static void clearcmdentry (int);
678 static struct tblentry *cmdlookup (const char *, int);
679 static void delete_cmd_entry (void);
680 static int path_change (const char *, int *);
683 static void flushall (void);
684 static void out2fmt (const char *, ...)
685 __attribute__((__format__(__printf__,1,2)));
686 static int xwrite (int, const char *, int);
688 #define outstr(p,file) fputs(p, file)
689 static void out1str(const char *p) { outstr(p, stdout); }
690 static void out2str(const char *p) { outstr(p, stderr); }
692 #ifndef ASH_OPTIMIZE_FOR_SIZE
693 #define out2c(c) putc((c), stderr)
695 static void out2c(int c) { putc(c, stderr); }
699 #ifdef ASH_OPTIMIZE_FOR_SIZE
700 #define USE_SIT_FUNCTION
703 /* number syntax index */
704 #define BASESYNTAX 0 /* not in quotes */
705 #define DQSYNTAX 1 /* in double quotes */
706 #define SQSYNTAX 2 /* in single quotes */
707 #define ARISYNTAX 3 /* in arithmetic */
709 static const char S_I_T[][4] = {
710 /* 0 */ { CSPCL, CIGN, CIGN, CIGN }, /* PEOA */
711 /* 1 */ { CSPCL, CWORD, CWORD, CWORD }, /* ' ' */
712 /* 2 */ { CNL, CNL, CNL, CNL }, /* \n */
713 /* 3 */ { CWORD, CCTL, CCTL, CWORD }, /* !*-/:=?[]~ */
714 /* 4 */ { CDQUOTE, CENDQUOTE, CWORD, CDQUOTE }, /* '"' */
715 /* 5 */ { CVAR, CVAR, CWORD, CVAR }, /* $ */
716 /* 6 */ { CSQUOTE, CWORD, CENDQUOTE, CSQUOTE }, /* "'" */
717 /* 7 */ { CSPCL, CWORD, CWORD, CLP }, /* ( */
718 /* 8 */ { CSPCL, CWORD, CWORD, CRP }, /* ) */
719 /* 9 */ { CBACK, CBACK, CCTL, CBACK }, /* \ */
720 /* 10 */ { CBQUOTE, CBQUOTE, CWORD, CBQUOTE }, /* ` */
721 /* 11 */ { CENDVAR, CENDVAR, CWORD, CENDVAR }, /* } */
722 #ifndef USE_SIT_FUNCTION
723 /* 12 */ { CENDFILE, CENDFILE, CENDFILE, CENDFILE }, /* PEOF */
724 /* 13 */ { CWORD, CWORD, CWORD, CWORD }, /* 0-9A-Za-z */
725 /* 14 */ { CCTL, CCTL, CCTL, CCTL } /* CTLESC ... */
729 #ifdef USE_SIT_FUNCTION
731 #define U_C(c) ((unsigned char)(c))
733 static int SIT(int c, int syntax)
735 static const char spec_symbls[]="\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
736 static const char syntax_index_table [] = {
737 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
738 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
739 3, 1, 3, 3, 9, 3,10, 1, /* "=>?[\\]`|" */
744 if(c==PEOF) /* 2^8+2 */
746 if(c==PEOA) /* 2^8+1 */
748 else if(U_C(c)>=U_C(CTLESC) && U_C(c)<=U_C(CTLQUOTEMARK))
751 s = strchr(spec_symbls, c);
754 indx = syntax_index_table[(s-spec_symbls)];
756 return S_I_T[indx][syntax];
759 #else /* USE_SIT_FUNCTION */
761 #define SIT(c, syntax) S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax]
763 #define CSPCL_CIGN_CIGN_CIGN 0
764 #define CSPCL_CWORD_CWORD_CWORD 1
765 #define CNL_CNL_CNL_CNL 2
766 #define CWORD_CCTL_CCTL_CWORD 3
767 #define CDQUOTE_CENDQUOTE_CWORD_CDQUOTE 4
768 #define CVAR_CVAR_CWORD_CVAR 5
769 #define CSQUOTE_CWORD_CENDQUOTE_CSQUOTE 6
770 #define CSPCL_CWORD_CWORD_CLP 7
771 #define CSPCL_CWORD_CWORD_CRP 8
772 #define CBACK_CBACK_CCTL_CBACK 9
773 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
774 #define CENDVAR_CENDVAR_CWORD_CENDVAR 11
775 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
776 #define CWORD_CWORD_CWORD_CWORD 13
777 #define CCTL_CCTL_CCTL_CCTL 14
779 static const char syntax_index_table[258] = {
780 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
781 /* 0 -130 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
782 /* 1 -129 PEOA */ CSPCL_CIGN_CIGN_CIGN,
783 /* 2 -128 0xff */ CWORD_CWORD_CWORD_CWORD,
784 /* 3 -127 */ CCTL_CCTL_CCTL_CCTL, /* CTLQUOTEMARK */
785 /* 4 -126 */ CCTL_CCTL_CCTL_CCTL,
786 /* 5 -125 */ CCTL_CCTL_CCTL_CCTL,
787 /* 6 -124 */ CCTL_CCTL_CCTL_CCTL,
788 /* 7 -123 */ CCTL_CCTL_CCTL_CCTL,
789 /* 8 -122 */ CCTL_CCTL_CCTL_CCTL,
790 /* 9 -121 */ CCTL_CCTL_CCTL_CCTL,
791 /* 10 -120 */ CCTL_CCTL_CCTL_CCTL, /* CTLESC */
792 /* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
793 /* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
794 /* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
795 /* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
796 /* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
797 /* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
798 /* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
799 /* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
800 /* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
801 /* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
802 /* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
803 /* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
804 /* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
805 /* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
806 /* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
807 /* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
808 /* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
809 /* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
810 /* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
811 /* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
812 /* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
813 /* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
814 /* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
815 /* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
816 /* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
817 /* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
818 /* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
819 /* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
820 /* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
821 /* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
822 /* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
823 /* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
824 /* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
825 /* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
826 /* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
827 /* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
828 /* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
829 /* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
830 /* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
831 /* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
832 /* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
833 /* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
834 /* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
835 /* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
836 /* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
837 /* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
838 /* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
839 /* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
840 /* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
841 /* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
842 /* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
843 /* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
844 /* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
845 /* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
846 /* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
847 /* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
848 /* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
849 /* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
850 /* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
851 /* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
852 /* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
853 /* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
854 /* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
855 /* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
856 /* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
857 /* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
858 /* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
859 /* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
860 /* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
861 /* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
862 /* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
863 /* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
864 /* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
865 /* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
866 /* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
867 /* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
868 /* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
869 /* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
870 /* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
871 /* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
872 /* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
873 /* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
874 /* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
875 /* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
876 /* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
877 /* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
878 /* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
879 /* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
880 /* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
881 /* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
882 /* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
883 /* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
884 /* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
885 /* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
886 /* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
887 /* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
888 /* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
889 /* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
890 /* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
891 /* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
892 /* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
893 /* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
894 /* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
895 /* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
896 /* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
897 /* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
898 /* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
899 /* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
900 /* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
901 /* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
902 /* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
903 /* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
904 /* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
905 /* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
906 /* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
907 /* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
908 /* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
909 /* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
910 /* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
911 /* 130 0 */ CWORD_CWORD_CWORD_CWORD,
912 /* 131 1 */ CWORD_CWORD_CWORD_CWORD,
913 /* 132 2 */ CWORD_CWORD_CWORD_CWORD,
914 /* 133 3 */ CWORD_CWORD_CWORD_CWORD,
915 /* 134 4 */ CWORD_CWORD_CWORD_CWORD,
916 /* 135 5 */ CWORD_CWORD_CWORD_CWORD,
917 /* 136 6 */ CWORD_CWORD_CWORD_CWORD,
918 /* 137 7 */ CWORD_CWORD_CWORD_CWORD,
919 /* 138 8 */ CWORD_CWORD_CWORD_CWORD,
920 /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
921 /* 140 10 "\n" */ CNL_CNL_CNL_CNL,
922 /* 141 11 */ CWORD_CWORD_CWORD_CWORD,
923 /* 142 12 */ CWORD_CWORD_CWORD_CWORD,
924 /* 143 13 */ CWORD_CWORD_CWORD_CWORD,
925 /* 144 14 */ CWORD_CWORD_CWORD_CWORD,
926 /* 145 15 */ CWORD_CWORD_CWORD_CWORD,
927 /* 146 16 */ CWORD_CWORD_CWORD_CWORD,
928 /* 147 17 */ CWORD_CWORD_CWORD_CWORD,
929 /* 148 18 */ CWORD_CWORD_CWORD_CWORD,
930 /* 149 19 */ CWORD_CWORD_CWORD_CWORD,
931 /* 150 20 */ CWORD_CWORD_CWORD_CWORD,
932 /* 151 21 */ CWORD_CWORD_CWORD_CWORD,
933 /* 152 22 */ CWORD_CWORD_CWORD_CWORD,
934 /* 153 23 */ CWORD_CWORD_CWORD_CWORD,
935 /* 154 24 */ CWORD_CWORD_CWORD_CWORD,
936 /* 155 25 */ CWORD_CWORD_CWORD_CWORD,
937 /* 156 26 */ CWORD_CWORD_CWORD_CWORD,
938 /* 157 27 */ CWORD_CWORD_CWORD_CWORD,
939 /* 158 28 */ CWORD_CWORD_CWORD_CWORD,
940 /* 159 29 */ CWORD_CWORD_CWORD_CWORD,
941 /* 160 30 */ CWORD_CWORD_CWORD_CWORD,
942 /* 161 31 */ CWORD_CWORD_CWORD_CWORD,
943 /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
944 /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
945 /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CDQUOTE,
946 /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
947 /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
948 /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
949 /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
950 /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CSQUOTE,
951 /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
952 /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
953 /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
954 /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
955 /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
956 /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
957 /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
958 /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
959 /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
960 /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
961 /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
962 /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
963 /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
964 /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
965 /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
966 /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
967 /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
968 /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
969 /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
970 /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
971 /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
972 /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
973 /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
974 /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
975 /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
976 /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
977 /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
978 /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
979 /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
980 /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
981 /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
982 /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
983 /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
984 /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
985 /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
986 /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
987 /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
988 /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
989 /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
990 /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
991 /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
992 /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
993 /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
994 /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
995 /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
996 /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
997 /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
998 /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
999 /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
1000 /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
1001 /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
1002 /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
1003 /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
1004 /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
1005 /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
1006 /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
1007 /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
1008 /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
1009 /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
1010 /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
1011 /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
1012 /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
1013 /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
1014 /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
1015 /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
1016 /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
1017 /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
1018 /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
1019 /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
1020 /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
1021 /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
1022 /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
1023 /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
1024 /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
1025 /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
1026 /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
1027 /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
1028 /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
1029 /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
1030 /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
1031 /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
1032 /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
1033 /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
1034 /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
1035 /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
1036 /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
1037 /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
1038 /* 257 127 */ CWORD_CWORD_CWORD_CWORD,
1041 #endif /* USE_SIT_FUNCTION */
1044 /* first char is indicating which tokens mark the end of a list */
1045 static const char *const tokname_array[] = {
1060 #define KWDOFFSET 14
1061 /* the following are keywords */
1080 static const char *tokname(int tok)
1082 static char buf[16];
1086 sprintf(buf+(tok>=TSEMI), "%s%c",
1087 tokname_array[tok]+1, (tok>=TSEMI ? '"' : 0));
1091 static int plinno = 1; /* input line number */
1093 static int parselleft; /* copy of parsefile->lleft */
1095 static struct parsefile basepf; /* top level input file */
1096 static char basebuf[BUFSIZ]; /* buffer for top level input file */
1097 static struct parsefile *parsefile = &basepf; /* current input file */
1100 * NEOF is returned by parsecmd when it encounters an end of file. It
1101 * must be distinct from NULL, so we use the address of a variable that
1102 * happens to be handy.
1105 static int tokpushback; /* last token pushed back */
1106 #define NEOF ((union node *)&tokpushback)
1107 static int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
1110 static void error (const char *, ...) __attribute__((__noreturn__));
1111 static void exerror (int, const char *, ...) __attribute__((__noreturn__));
1112 static void shellexec (char **, char **, const char *, int)
1113 __attribute__((noreturn));
1114 static void exitshell (int) __attribute__((noreturn));
1116 static int goodname(const char *);
1117 static void ignoresig (int);
1118 static void onsig (int);
1119 static void dotrap (void);
1120 static int decode_signal (const char *, int);
1122 static void shprocvar(void);
1123 static void deletefuncs(void);
1124 static void setparam (char **);
1125 static void freeparam (volatile struct shparam *);
1127 /* reasons for skipping commands (see comment on breakcmd routine) */
1133 /* values of cmdtype */
1134 #define CMDUNKNOWN -1 /* no entry in table for command */
1135 #define CMDNORMAL 0 /* command is an executable program */
1136 #define CMDBUILTIN 1 /* command is a shell builtin */
1137 #define CMDFUNCTION 2 /* command is a shell function */
1139 #define DO_ERR 1 /* find_command prints errors */
1140 #define DO_ABS 2 /* find_command checks absolute paths */
1141 #define DO_NOFUN 4 /* find_command ignores functions */
1142 #define DO_BRUTE 8 /* find_command ignores hash table */
1149 #define VEXPORT 0x01 /* variable is exported */
1150 #define VREADONLY 0x02 /* variable cannot be modified */
1151 #define VSTRFIXED 0x04 /* variable struct is staticly allocated */
1152 #define VTEXTFIXED 0x08 /* text is staticly allocated */
1153 #define VSTACK 0x10 /* text is allocated on the stack */
1154 #define VUNSET 0x20 /* the variable is not set */
1155 #define VNOFUNC 0x40 /* don't call the callback function */
1159 struct var *next; /* next entry in hash list */
1160 int flags; /* flags are defined above */
1161 char *text; /* name=value */
1162 void (*func) (const char *);
1163 /* function to be called when */
1164 /* the variable gets set/unset */
1168 struct localvar *next; /* next local variable in list */
1169 struct var *vp; /* the variable that was made local */
1170 int flags; /* saved flags */
1171 char *text; /* saved text */
1175 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
1176 #define rmescapes(p) _rmescapes((p), 0)
1177 static char *_rmescapes (char *, int);
1179 static void rmescapes (char *);
1182 static int casematch (union node *, const char *);
1183 static void clearredir(void);
1184 static void popstring(void);
1185 static void readcmdfile (const char *);
1187 static int number (const char *);
1188 static int is_number (const char *, int *num);
1189 static char *single_quote (const char *);
1190 static int nextopt (const char *);
1192 static void redirect (union node *, int);
1193 static void popredir (void);
1194 static int dup_as_newfd (int, int);
1196 static void changepath(const char *newval);
1197 static void getoptsreset(const char *value);
1200 static int parsenleft; /* copy of parsefile->nleft */
1201 static char *parsenextc; /* copy of parsefile->nextc */
1202 static int rootpid; /* pid of main shell */
1203 static int rootshell; /* true if we aren't a child of the main shell */
1205 static const char spcstr[] = " ";
1206 static const char snlfmt[] = "%s\n";
1208 static int sstrnleft;
1209 static int herefd = -1;
1211 static struct localvar *localvars;
1213 static struct var vifs;
1214 static struct var vmail;
1215 static struct var vmpath;
1216 static struct var vpath;
1217 static struct var vps1;
1218 static struct var vps2;
1219 static struct var voptind;
1220 #ifdef BB_LOCALE_SUPPORT
1221 static struct var vlc_all;
1222 static struct var vlc_ctype;
1229 void (*func) (const char *);
1232 static const char defpathvar[] =
1233 "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
1234 #define defpath (defpathvar + 5)
1237 static const char defifsvar[] = "IFS= \t\n";
1238 #define defifs (defifsvar + 4)
1240 static const char defifs[] = " \t\n";
1243 static const struct varinit varinit[] = {
1245 { &vifs, VSTRFIXED|VTEXTFIXED, defifsvar,
1247 { &vifs, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS=",
1250 { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=",
1252 { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=",
1254 { &vpath, VSTRFIXED|VTEXTFIXED, defpathvar,
1257 * vps1 depends on uid
1259 { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ",
1261 { &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1",
1263 #ifdef BB_LOCALE_SUPPORT
1264 { &vlc_all, VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL=",
1266 { &vlc_ctype, VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE=",
1275 static struct var *vartab[VTABSIZE];
1278 * The following macros access the values of the above variables.
1279 * They have to skip over the name. They return the null string
1280 * for unset variables.
1283 #define ifsval() (vifs.text + 4)
1284 #define ifsset() ((vifs.flags & VUNSET) == 0)
1285 #define mailval() (vmail.text + 5)
1286 #define mpathval() (vmpath.text + 9)
1287 #define pathval() (vpath.text + 5)
1288 #define ps1val() (vps1.text + 4)
1289 #define ps2val() (vps2.text + 4)
1290 #define optindval() (voptind.text + 7)
1292 #define mpathset() ((vmpath.flags & VUNSET) == 0)
1294 static void initvar (void);
1295 static void setvar (const char *, const char *, int);
1296 static void setvareq (char *, int);
1297 static void listsetvar (struct strlist *);
1298 static const char *lookupvar (const char *);
1299 static const char *bltinlookup (const char *);
1300 static char **environment (void);
1301 static int showvarscmd (int, char **);
1302 static void mklocal (char *);
1303 static void poplocalvars (void);
1304 static int unsetvar (const char *);
1305 static int varequal (const char *, const char *);
1308 static char *arg0; /* value of $0 */
1309 static struct shparam shellparam; /* current positional parameters */
1310 static char **argptr; /* argument list for builtin commands */
1311 static char *optionarg; /* set by nextopt (like getopt) */
1312 static char *optptr; /* used by nextopt */
1313 static char *minusc; /* argument to -c option */
1318 #define ALIASINUSE 1
1330 static struct alias *atab[ATABSIZE];
1332 static void setalias (char *, char *);
1333 static struct alias **hashalias (const char *);
1334 static struct alias *freealias (struct alias *);
1335 static struct alias **__lookupalias (const char *);
1341 struct alias *ap, **app;
1343 app = __lookupalias(name);
1347 if (!(ap->flag & ALIASINUSE)) {
1350 ap->val = savestr(val);
1351 ap->flag &= ~ALIASDEAD;
1354 ap = ckmalloc(sizeof (struct alias));
1355 ap->name = savestr(name);
1356 ap->val = savestr(val);
1369 app = __lookupalias(name);
1373 *app = freealias(*app);
1384 struct alias *ap, **app;
1388 for (i = 0; i < ATABSIZE; i++) {
1390 for (ap = *app; ap; ap = *app) {
1391 *app = freealias(*app);
1400 static struct alias *
1401 lookupalias(const char *name, int check)
1403 struct alias *ap = *__lookupalias(name);
1405 if (check && ap && (ap->flag & ALIASINUSE))
1411 printalias(const struct alias *ap) {
1414 p = single_quote(ap->val);
1415 printf("alias %s=%s\n", ap->name, p);
1421 * TODO - sort output
1424 aliascmd(int argc, char **argv)
1433 for (i = 0; i < ATABSIZE; i++)
1434 for (ap = atab[i]; ap; ap = ap->next) {
1439 while ((n = *++argv) != NULL) {
1440 if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */
1441 if ((ap = *__lookupalias(n)) == NULL) {
1442 out2fmt("%s: %s not found\n", "alias", n);
1457 unaliascmd(int argc, char **argv)
1461 while ((i = nextopt("a")) != '\0') {
1467 for (i = 0; *argptr; argptr++) {
1468 if (unalias(*argptr)) {
1469 out2fmt("%s: %s not found\n", "unalias", *argptr);
1477 static struct alias **
1481 unsigned int hashval;
1486 return &atab[hashval % ATABSIZE];
1489 static struct alias *
1490 freealias(struct alias *ap) {
1493 if (ap->flag & ALIASINUSE) {
1494 ap->flag |= ALIASDEAD;
1506 static struct alias **
1507 __lookupalias(const char *name) {
1508 struct alias **app = hashalias(name);
1510 for (; *app; app = &(*app)->next) {
1511 if (equal(name, (*app)->name)) {
1520 #ifdef ASH_MATH_SUPPORT
1521 /* The generated file arith.c has been replaced with a custom hand
1522 * written implementation written by Aaron Lehmann <aaronl@vitelus.com>.
1523 * This is now part of libbb, so that it can be used by all the shells
1525 #define ARITH_NUM 257
1526 #define ARITH_LPAREN 258
1527 #define ARITH_RPAREN 259
1528 #define ARITH_OR 260
1529 #define ARITH_AND 261
1530 #define ARITH_BOR 262
1531 #define ARITH_BXOR 263
1532 #define ARITH_BAND 264
1533 #define ARITH_EQ 265
1534 #define ARITH_NE 266
1535 #define ARITH_LT 267
1536 #define ARITH_GT 268
1537 #define ARITH_GE 269
1538 #define ARITH_LE 270
1539 #define ARITH_LSHIFT 271
1540 #define ARITH_RSHIFT 272
1541 #define ARITH_ADD 273
1542 #define ARITH_SUB 274
1543 #define ARITH_MUL 275
1544 #define ARITH_DIV 276
1545 #define ARITH_REM 277
1546 #define ARITH_UNARYMINUS 278
1547 #define ARITH_UNARYPLUS 279
1548 #define ARITH_NOT 280
1549 #define ARITH_BNOT 281
1551 static void expari (int);
1554 static char *trap[NSIG]; /* trap handler commands */
1555 static char sigmode[NSIG - 1]; /* current value of signal */
1556 static char gotsig[NSIG - 1]; /* indicates specified signal received */
1557 static int pendingsigs; /* indicates some signal received */
1560 * This file was generated by the mkbuiltins program.
1564 static int bgcmd (int, char **);
1565 static int fgcmd (int, char **);
1566 static int killcmd (int, char **);
1568 static int bltincmd (int, char **);
1569 static int cdcmd (int, char **);
1570 static int breakcmd (int, char **);
1572 static int commandcmd (int, char **);
1574 static int dotcmd (int, char **);
1575 static int evalcmd (int, char **);
1576 static int execcmd (int, char **);
1577 static int exitcmd (int, char **);
1578 static int exportcmd (int, char **);
1579 static int histcmd (int, char **);
1580 static int hashcmd (int, char **);
1581 static int helpcmd (int, char **);
1582 static int jobscmd (int, char **);
1583 static int localcmd (int, char **);
1585 static int pwdcmd (int, char **);
1587 static int readcmd (int, char **);
1588 static int returncmd (int, char **);
1589 static int setcmd (int, char **);
1590 static int setvarcmd (int, char **);
1591 static int shiftcmd (int, char **);
1592 static int trapcmd (int, char **);
1593 static int umaskcmd (int, char **);
1595 static int aliascmd (int, char **);
1596 static int unaliascmd (int, char **);
1598 static int unsetcmd (int, char **);
1599 static int waitcmd (int, char **);
1600 static int ulimitcmd (int, char **);
1601 static int timescmd (int, char **);
1602 #ifdef ASH_MATH_SUPPORT
1603 static int letcmd (int, char **);
1605 static int typecmd (int, char **);
1607 static int getoptscmd (int, char **);
1610 #ifndef BB_TRUE_FALSE
1611 static int true_main (int, char **);
1612 static int false_main (int, char **);
1615 static void setpwd (const char *, int);
1618 #define BUILTIN_NOSPEC "0"
1619 #define BUILTIN_SPECIAL "1"
1620 #define BUILTIN_REGULAR "2"
1621 #define BUILTIN_ASSIGN "4"
1622 #define BUILTIN_SPEC_ASSG "5"
1623 #define BUILTIN_REG_ASSG "6"
1625 #define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1)
1626 #define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2)
1627 #define IS_BUILTIN_ASSIGN(builtincmd) ((builtincmd)->name[0] & 4)
1631 int (*const builtinfunc) (int, char **);
1636 /* It is CRUCIAL that this listing be kept in ascii order, otherwise
1637 * the binary search in find_builtin() will stop working. If you value
1638 * your kneecaps, you'll be sure to *make sure* that any changes made
1639 * to this array result in the listing remaining in ascii order. You
1642 static const struct builtincmd builtincmds[] = {
1643 { BUILTIN_SPECIAL ".", dotcmd }, /* first, see declare DOTCMD */
1644 { BUILTIN_SPECIAL ":", true_main },
1646 { BUILTIN_REG_ASSG "alias", aliascmd },
1649 { BUILTIN_REGULAR "bg", bgcmd },
1651 { BUILTIN_SPECIAL "break", breakcmd },
1652 { BUILTIN_SPECIAL "builtin", bltincmd },
1653 { BUILTIN_REGULAR "cd", cdcmd },
1654 { BUILTIN_NOSPEC "chdir", cdcmd },
1656 { BUILTIN_REGULAR "command", commandcmd },
1658 { BUILTIN_SPECIAL "continue", breakcmd },
1659 { BUILTIN_SPECIAL "eval", evalcmd },
1660 { BUILTIN_SPECIAL "exec", execcmd },
1661 { BUILTIN_SPECIAL "exit", exitcmd },
1662 { BUILTIN_SPEC_ASSG "export", exportcmd },
1663 { BUILTIN_REGULAR "false", false_main },
1664 { BUILTIN_REGULAR "fc", histcmd },
1666 { BUILTIN_REGULAR "fg", fgcmd },
1669 { BUILTIN_REGULAR "getopts", getoptscmd },
1671 { BUILTIN_NOSPEC "hash", hashcmd },
1672 { BUILTIN_NOSPEC "help", helpcmd },
1673 { BUILTIN_REGULAR "jobs", jobscmd },
1675 { BUILTIN_REGULAR "kill", killcmd },
1677 #ifdef ASH_MATH_SUPPORT
1678 { BUILTIN_REGULAR "let", letcmd },
1680 { BUILTIN_ASSIGN "local", localcmd },
1682 { BUILTIN_NOSPEC "pwd", pwdcmd },
1684 { BUILTIN_REGULAR "read", readcmd },
1685 { BUILTIN_SPEC_ASSG "readonly", exportcmd },
1686 { BUILTIN_SPECIAL "return", returncmd },
1687 { BUILTIN_SPECIAL "set", setcmd },
1688 { BUILTIN_NOSPEC "setvar", setvarcmd },
1689 { BUILTIN_SPECIAL "shift", shiftcmd },
1690 { BUILTIN_SPECIAL "times", timescmd },
1691 { BUILTIN_SPECIAL "trap", trapcmd },
1692 { BUILTIN_REGULAR "true", true_main },
1693 { BUILTIN_NOSPEC "type", typecmd },
1694 { BUILTIN_NOSPEC "ulimit", ulimitcmd },
1695 { BUILTIN_REGULAR "umask", umaskcmd },
1697 { BUILTIN_REGULAR "unalias", unaliascmd },
1699 { BUILTIN_SPECIAL "unset", unsetcmd },
1700 { BUILTIN_REGULAR "wait", waitcmd },
1702 #define NUMBUILTINS (sizeof (builtincmds) / sizeof (struct builtincmd) )
1704 #define DOTCMD &builtincmds[0]
1705 static struct builtincmd *BLTINCMD;
1706 static struct builtincmd *EXECCMD;
1707 static struct builtincmd *EVALCMD;
1710 #define JOBSTOPPED 1 /* all procs are stopped */
1711 #define JOBDONE 2 /* all procs are completed */
1714 * A job structure contains information about a job. A job is either a
1715 * single process or a set of processes contained in a pipeline. In the
1716 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
1721 pid_t pid; /* process id */
1722 int status; /* status flags (defined above) */
1723 char *cmd; /* text of command being run */
1727 static int job_warning; /* user was warned about stopped jobs */
1730 static void setjobctl(int enable);
1732 #define setjobctl(on) /* do nothing */
1737 struct procstat ps0; /* status of process */
1738 struct procstat *ps; /* status or processes when more than one */
1739 short nprocs; /* number of processes */
1740 short pgrp; /* process group of this job */
1741 char state; /* true if job is finished */
1742 char used; /* true if this entry is in used */
1743 char changed; /* true if status has changed */
1745 char jobctl; /* job running under job control */
1749 static struct job *jobtab; /* array of jobs */
1750 static int njobs; /* size of array */
1751 static int backgndpid = -1; /* pid of last background process */
1753 static int initialpgrp; /* pgrp of shell on invocation */
1754 static int curjob; /* current job */
1757 static int intreceived;
1759 static struct job *makejob (const union node *, int);
1760 static int forkshell (struct job *, const union node *, int);
1761 static int waitforjob (struct job *);
1763 static int docd (char *, int);
1764 static char *getcomponent (void);
1765 static void updatepwd (const char *);
1766 static void getpwd (void);
1768 static char *padvance (const char **, const char *);
1770 static char nullstr[1]; /* zero length string */
1771 static char *curdir = nullstr; /* current working directory */
1772 static char *cdcomppath;
1786 if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME")) == NULL)
1787 error("HOME not set");
1790 if (dest[0] == '-' && dest[1] == '\0') {
1791 dest = bltinlookup("OLDPWD");
1792 if (!dest || !*dest) {
1801 if (*dest == '/' || (path = bltinlookup("CDPATH")) == NULL)
1803 while ((p = padvance(&path, dest)) != NULL) {
1804 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
1809 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
1811 print = strcmp(p, dest);
1813 if (docd(p, print) >= 0)
1818 error("can't cd to %s", dest);
1824 * Actually do the chdir. In an interactive shell, print the
1825 * directory name if "print" is nonzero.
1840 TRACE(("docd(\"%s\", %d) called\n", dest, print));
1843 * Check each component of the path. If we find a symlink or
1844 * something we can't stat, clear curdir to force a getcwd()
1845 * next time we get the value of the current directory.
1848 cdcomppath = sstrdup(dest);
1855 while ((q = getcomponent()) != NULL) {
1856 if (q[0] == '\0' || (q[0] == '.' && q[1] == '\0'))
1864 if (equal(component, ".."))
1867 if ((lstat(stackblock(), &statb) < 0)
1868 || (S_ISLNK(statb.st_mode))) {
1876 if (chdir(dest) < 0) {
1880 updatepwd(badstat ? NULL : dest);
1883 printf(snlfmt, curdir);
1889 * Get the next component of the path name pointed to by cdcomppath.
1890 * This routine overwrites the string pointed to by cdcomppath.
1898 if ((p = cdcomppath) == NULL)
1901 while (*p != '/' && *p != '\0')
1915 * Update curdir (the name of the current directory) in response to a
1916 * cd command. We also call hashcd to let the routines in exec.c know
1917 * that the current directory has changed.
1920 static void hashcd (void);
1923 updatepwd(const char *dir)
1929 hashcd(); /* update command hash table */
1932 * If our argument is NULL, we don't know the current directory
1933 * any more because we traversed a symbolic link or something
1934 * we couldn't stat().
1936 if (dir == NULL || curdir == nullstr) {
1941 cdcomppath = sstrdup(dir);
1950 while ((p = getcomponent()) != NULL) {
1951 if (equal(p, "..")) {
1952 while (new > stackblock() && (STUNPUTC(new), *new) != '/');
1953 } else if (*p != '\0' && ! equal(p, ".")) {
1959 if (new == stackblock())
1962 setpwd(stackblock(), 1);
1972 printf(snlfmt, curdir);
1978 * Find out what the current directory is. If we already know the current
1979 * directory, this routine returns immediately.
1984 curdir = xgetcwd(0);
1990 setpwd(const char *val, int setold)
1993 setvar("OLDPWD", curdir, VEXPORT);
1996 if (curdir != nullstr) {
2003 curdir = savestr(val);
2006 setvar("PWD", curdir, VEXPORT);
2010 * Errors and exceptions.
2014 * Code to handle exceptions in C.
2018 * We enclose jmp_buf in a structure so that we can declare pointers to
2019 * jump locations. The global variable handler contains the location to
2020 * jump to when an exception occurs, and the global variable exception
2021 * contains a code identifying the exeception. To implement nested
2022 * exception handlers, the user should save the value of handler on entry
2023 * to an inner scope, set handler to point to a jmploc structure for the
2024 * inner scope, and restore handler on exit from the scope.
2032 #define EXINT 0 /* SIGINT received */
2033 #define EXERROR 1 /* a generic error */
2034 #define EXSHELLPROC 2 /* execute a shell procedure */
2035 #define EXEXEC 3 /* command execution failed */
2037 static struct jmploc *handler;
2038 static int exception;
2040 static void exverror (int, const char *, va_list)
2041 __attribute__((__noreturn__));
2044 * Called to raise an exception. Since C doesn't include exceptions, we
2045 * just do a longjmp to the exception handler. The type of exception is
2046 * stored in the global variable "exception".
2049 static void exraise (int) __attribute__((__noreturn__));
2055 if (handler == NULL)
2060 longjmp(handler->loc, 1);
2065 * Called from trap.c when a SIGINT is received. (If the user specifies
2066 * that SIGINT is to be trapped or ignored using the trap builtin, then
2067 * this routine is not called.) Suppressint is nonzero when interrupts
2068 * are held using the INTOFF macro. The call to _exit is necessary because
2069 * there is a short period after a fork before the signal handlers are
2070 * set to the appropriate value for the child. (The test for iflag is
2071 * just defensive programming.)
2083 sigemptyset(&mysigset);
2084 sigprocmask(SIG_SETMASK, &mysigset, NULL);
2085 if (rootshell && iflag)
2088 signal(SIGINT, SIG_DFL);
2095 static char *commandname; /* currently executing command */
2098 * Exverror is called to raise the error exception. If the first argument
2099 * is not NULL then error prints an error message using printf style
2100 * formatting. It then raises the error exception.
2103 exverror(int cond, const char *msg, va_list ap)
2110 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
2112 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
2116 out2fmt("%s: ", commandname);
2117 vfprintf(stderr, msg, ap);
2126 error(const char *msg, ...)
2130 exverror(EXERROR, msg, ap);
2137 exerror(int cond, const char *msg, ...)
2141 exverror(cond, msg, ap);
2149 * Table of error messages.
2153 short errcode; /* error number */
2154 char action; /* operation which encountered the error */
2158 * Types of operations (passed to the errmsg routine).
2161 #define E_OPEN 01 /* opening a file */
2162 #define E_CREAT 02 /* creating a file */
2163 #define E_EXEC 04 /* executing a program */
2165 #define ALL (E_OPEN|E_CREAT|E_EXEC)
2167 static const struct errname errormsg[] = {
2172 { ENOENT, E_CREAT },
2174 { ENOTDIR, E_OPEN },
2175 { ENOTDIR, E_CREAT },
2176 { ENOTDIR, E_EXEC },
2178 { EEXIST, E_CREAT },
2217 { ELIBACC, E_EXEC },
2221 #define ERRNAME_SIZE (sizeof(errormsg)/sizeof(struct errname))
2224 * Return a string describing an error. The returned string may be a
2225 * pointer to a static buffer that will be overwritten on the next call.
2226 * Action describes the operation that got the error.
2230 errmsg(int e, int action)
2232 struct errname const *ep;
2233 static char buf[12];
2235 for (ep = errormsg ; ep < errormsg+ERRNAME_SIZE; ep++) {
2236 if (ep->errcode == e && (ep->action & action) != 0)
2240 snprintf(buf, sizeof buf, "error %d", e);
2245 #ifdef ASH_OPTIMIZE_FOR_SIZE
2248 if (--suppressint == 0 && intpending) {
2252 static void forceinton (void) {
2259 /* flags in argument to evaltree */
2260 #define EV_EXIT 01 /* exit after evaluating tree */
2261 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
2262 #define EV_BACKCMD 04 /* command executing within back quotes */
2264 static int evalskip; /* set if we are skipping commands */
2265 static int skipcount; /* number of levels to skip */
2266 static int loopnest; /* current loop nesting level */
2267 static int funcnest; /* depth of function calls */
2270 static struct strlist *cmdenviron; /* environment for builtin command */
2271 static int exitstatus; /* exit status of last command */
2272 static int oexitstatus; /* saved exit status */
2274 static void evalsubshell (const union node *, int);
2275 static void expredir (union node *);
2276 static void prehash (union node *);
2277 static void eprintlist (struct strlist *);
2279 static union node *parsecmd(int);
2281 * Called to reset things after an exception.
2285 * The eval commmand.
2287 static void evalstring (char *, int);
2301 STARTSTACKSTR(concat);
2305 STPUTC(*p++, concat);
2306 if ((p = *ap++) == NULL)
2308 STPUTC(' ', concat);
2310 STPUTC('\0', concat);
2311 p = grabstackstr(concat);
2313 evalstring(p, EV_TESTED);
2319 * Execute a command or commands contained in a string.
2322 static void evaltree (union node *, int);
2323 static void setinputstring (char *);
2324 static void popfile (void);
2325 static void setstackmark(struct stackmark *mark);
2326 static void popstackmark(struct stackmark *mark);
2330 evalstring(char *s, int flag)
2333 struct stackmark smark;
2335 setstackmark(&smark);
2337 while ((n = parsecmd(0)) != NEOF) {
2339 popstackmark(&smark);
2342 popstackmark(&smark);
2345 static struct builtincmd *find_builtin (const char *);
2346 static void expandarg (union node *, struct arglist *, int);
2347 static void calcsize (const union node *);
2348 static union node *copynode (const union node *);
2351 * Make a copy of a parse tree.
2354 static int funcblocksize; /* size of structures in function */
2355 static int funcstringsize; /* size of strings in node */
2356 static pointer funcblock; /* block to allocate function from */
2357 static char *funcstring; /* block to allocate strings from */
2360 static inline union node *
2361 copyfunc(union node *n)
2368 funcblock = ckmalloc(funcblocksize + funcstringsize);
2369 funcstring = (char *) funcblock + funcblocksize;
2374 * Free a parse tree.
2378 freefunc(union node *n)
2386 * Add a new command entry, replacing any existing command entry for
2391 addcmdentry(char *name, struct cmdentry *entry)
2393 struct tblentry *cmdp;
2396 cmdp = cmdlookup(name, 1);
2397 if (cmdp->cmdtype == CMDFUNCTION) {
2398 freefunc(cmdp->param.func);
2400 cmdp->cmdtype = entry->cmdtype;
2401 cmdp->param = entry->u;
2406 evalloop(const union node *n, int flags)
2413 evaltree(n->nbinary.ch1, EV_TESTED);
2415 skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
2419 if (evalskip == SKIPBREAK && --skipcount <= 0)
2423 if (n->type == NWHILE) {
2424 if (exitstatus != 0)
2427 if (exitstatus == 0)
2430 evaltree(n->nbinary.ch2, flags & EV_TESTED);
2431 status = exitstatus;
2436 exitstatus = status;
2440 evalfor(const union node *n, int flags)
2442 struct arglist arglist;
2445 struct stackmark smark;
2447 setstackmark(&smark);
2448 arglist.lastp = &arglist.list;
2449 for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
2450 oexitstatus = exitstatus;
2451 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
2455 *arglist.lastp = NULL;
2459 for (sp = arglist.list ; sp ; sp = sp->next) {
2460 setvar(n->nfor.var, sp->text, 0);
2461 evaltree(n->nfor.body, flags & EV_TESTED);
2463 if (evalskip == SKIPCONT && --skipcount <= 0) {
2467 if (evalskip == SKIPBREAK && --skipcount <= 0)
2474 popstackmark(&smark);
2478 evalcase(const union node *n, int flags)
2482 struct arglist arglist;
2483 struct stackmark smark;
2485 setstackmark(&smark);
2486 arglist.lastp = &arglist.list;
2487 oexitstatus = exitstatus;
2488 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
2489 for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
2490 for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {
2491 if (casematch(patp, arglist.list->text)) {
2492 if (evalskip == 0) {
2493 evaltree(cp->nclist.body, flags);
2500 popstackmark(&smark);
2504 * Evaluate a pipeline. All the processes in the pipeline are children
2505 * of the process creating the pipeline. (This differs from some versions
2506 * of the shell, which make the last process in a pipeline the parent
2515 struct nodelist *lp;
2520 TRACE(("evalpipe(0x%lx) called\n", (long)n));
2522 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
2525 jp = makejob(n, pipelen);
2527 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
2531 if (pipe(pip) < 0) {
2533 error("Pipe call failed");
2536 if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
2540 dup_as_newfd(prevfd, 0);
2552 dup_as_newfd(pip[1], 1);
2556 evaltree(lp->n, EV_EXIT);
2564 if (n->npipe.backgnd == 0) {
2566 exitstatus = waitforjob(jp);
2567 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
2572 static void find_command (const char *, struct cmdentry *, int, const char *);
2575 isassignment(const char *word) {
2576 if (!is_name(*word)) {
2581 } while (is_in_name(*word));
2582 return *word == '=';
2587 evalcommand(union node *cmd, int flags)
2589 struct stackmark smark;
2591 struct arglist arglist;
2592 struct arglist varlist;
2598 struct cmdentry cmdentry;
2600 char *volatile savecmdname;
2601 volatile struct shparam saveparam;
2602 struct localvar *volatile savelocalvars;
2606 const struct builtincmd *firstbltin;
2607 struct jmploc *volatile savehandler;
2608 struct jmploc jmploc;
2610 /* Avoid longjmp clobbering */
2617 /* First expand the arguments. */
2618 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
2619 setstackmark(&smark);
2620 arglist.lastp = &arglist.list;
2621 varlist.lastp = &varlist.list;
2623 oexitstatus = exitstatus;
2626 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
2627 expandarg(argp, &varlist, EXP_VARTILDE);
2630 argp = cmd->ncmd.args; argp && !arglist.list;
2631 argp = argp->narg.next
2633 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
2636 struct builtincmd *bcmd;
2638 bcmd = find_builtin(arglist.list->text);
2639 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
2640 for (; argp; argp = argp->narg.next) {
2641 if (pseudovarflag && isassignment(argp->narg.text)) {
2642 expandarg(argp, &arglist, EXP_VARTILDE);
2645 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
2648 *arglist.lastp = NULL;
2649 *varlist.lastp = NULL;
2650 expredir(cmd->ncmd.redirect);
2652 for (sp = arglist.list ; sp ; sp = sp->next)
2654 argv = stalloc(sizeof (char *) * (argc + 1));
2656 for (sp = arglist.list ; sp ; sp = sp->next) {
2657 TRACE(("evalcommand arg: %s\n", sp->text));
2662 if (iflag && funcnest == 0 && argc > 0)
2666 /* Print the command if xflag is set. */
2669 eprintlist(varlist.list);
2670 eprintlist(arglist.list);
2674 /* Now locate the command. */
2676 cmdentry.cmdtype = CMDBUILTIN;
2677 firstbltin = cmdentry.u.cmd = BLTINCMD;
2679 const char *oldpath;
2680 int findflag = DO_ERR;
2684 * Modify the command lookup path, if a PATH= assignment
2687 for (sp = varlist.list ; sp ; sp = sp->next)
2688 if (varequal(sp->text, defpathvar)) {
2689 path = sp->text + 5;
2690 findflag |= DO_BRUTE;
2693 oldfindflag = findflag;
2696 find_command(argv[0], &cmdentry, findflag, path);
2697 if (cmdentry.cmdtype == CMDUNKNOWN) { /* command not found */
2701 /* implement bltin and command here */
2702 if (cmdentry.cmdtype != CMDBUILTIN) {
2706 firstbltin = cmdentry.u.cmd;
2708 if (cmdentry.u.cmd == BLTINCMD) {
2710 struct builtincmd *bcmd;
2715 if (!(bcmd = find_builtin(*argv))) {
2716 out2fmt("%s: not found\n", *argv);
2720 cmdentry.u.cmd = bcmd;
2721 if (bcmd != BLTINCMD)
2725 if (cmdentry.u.cmd == find_builtin("command")) {
2730 if (*argv[0] == '-') {
2731 if (!equal(argv[0], "-p")) {
2741 findflag |= DO_BRUTE;
2744 findflag = oldfindflag;
2746 findflag |= DO_NOFUN;
2754 /* Fork off a child process if necessary. */
2755 if (cmd->ncmd.backgnd
2756 || (cmdentry.cmdtype == CMDNORMAL && (flags & EV_EXIT) == 0)
2758 jp = makejob(cmd, 1);
2759 mode = cmd->ncmd.backgnd;
2760 if (forkshell(jp, cmd, mode) != 0)
2761 goto parent; /* at end of routine */
2765 /* This is the child process if a fork occurred. */
2766 /* Execute the command. */
2767 if (cmdentry.cmdtype == CMDFUNCTION) {
2769 trputs("Shell function: "); trargs(argv);
2771 exitstatus = oexitstatus;
2772 redirect(cmd->ncmd.redirect, REDIR_PUSH);
2773 saveparam = shellparam;
2774 shellparam.malloc = 0;
2775 shellparam.nparam = argc - 1;
2776 shellparam.p = argv + 1;
2778 savelocalvars = localvars;
2781 if (setjmp(jmploc.loc)) {
2782 if (exception == EXSHELLPROC) {
2783 freeparam((volatile struct shparam *)
2786 saveparam.optind = shellparam.optind;
2787 saveparam.optoff = shellparam.optoff;
2788 freeparam(&shellparam);
2789 shellparam = saveparam;
2792 localvars = savelocalvars;
2793 handler = savehandler;
2794 longjmp(handler->loc, 1);
2796 savehandler = handler;
2798 for (sp = varlist.list ; sp ; sp = sp->next)
2801 evaltree(cmdentry.u.func, flags & EV_TESTED);
2805 localvars = savelocalvars;
2806 saveparam.optind = shellparam.optind;
2807 saveparam.optoff = shellparam.optoff;
2808 freeparam(&shellparam);
2809 shellparam = saveparam;
2810 handler = savehandler;
2813 if (evalskip == SKIPFUNC) {
2817 if (flags & EV_EXIT)
2818 exitshell(exitstatus);
2819 } else if (cmdentry.cmdtype == CMDBUILTIN) {
2821 trputs("builtin command: "); trargs(argv);
2823 mode = (cmdentry.u.cmd == EXECCMD)? 0 : REDIR_PUSH;
2824 redirect(cmd->ncmd.redirect, mode);
2825 savecmdname = commandname;
2826 if (IS_BUILTIN_SPECIAL(firstbltin)) {
2827 listsetvar(varlist.list);
2829 cmdenviron = varlist.list;
2832 if (setjmp(jmploc.loc)) {
2834 exitstatus = (e == EXINT)? SIGINT+128 : 2;
2837 savehandler = handler;
2839 commandname = argv[0];
2841 optptr = NULL; /* initialize nextopt */
2842 exitstatus = (*cmdentry.u.cmd->builtinfunc)(argc, argv);
2846 if (e != EXSHELLPROC) {
2847 commandname = savecmdname;
2848 if (flags & EV_EXIT)
2849 exitshell(exitstatus);
2851 handler = savehandler;
2853 if ((e != EXERROR && e != EXEXEC)
2854 || cmdentry.u.cmd == BLTINCMD
2855 || cmdentry.u.cmd == DOTCMD
2856 || cmdentry.u.cmd == EVALCMD
2857 || cmdentry.u.cmd == EXECCMD)
2861 if (cmdentry.u.cmd != EXECCMD)
2865 trputs("normal command: "); trargs(argv);
2867 redirect(cmd->ncmd.redirect, 0);
2869 for (sp = varlist.list ; sp ; sp = sp->next)
2870 setvareq(sp->text, VEXPORT|VSTACK);
2871 envp = environment();
2872 shellexec(argv, envp, path, cmdentry.u.index);
2876 parent: /* parent process gets here (if we forked) */
2877 if (mode == 0) { /* argument to fork */
2879 exitstatus = waitforjob(jp);
2885 setvar("_", lastarg, 0);
2886 popstackmark(&smark);
2890 * Evaluate a parse tree. The value is left in the global variable
2900 TRACE(("evaltree(NULL) called\n"));
2903 TRACE(("evaltree(0x%lx: %d) called\n", (long)n, n->type));
2906 evaltree(n->nbinary.ch1, flags & EV_TESTED);
2909 evaltree(n->nbinary.ch2, flags);
2912 evaltree(n->nbinary.ch1, EV_TESTED);
2913 if (evalskip || exitstatus != 0)
2915 evaltree(n->nbinary.ch2, flags);
2918 evaltree(n->nbinary.ch1, EV_TESTED);
2919 if (evalskip || exitstatus == 0)
2921 evaltree(n->nbinary.ch2, flags);
2924 expredir(n->nredir.redirect);
2925 redirect(n->nredir.redirect, REDIR_PUSH);
2926 evaltree(n->nredir.n, flags);
2930 evalsubshell(n, flags);
2933 evalsubshell(n, flags);
2936 evaltree(n->nif.test, EV_TESTED);
2939 if (exitstatus == 0)
2940 evaltree(n->nif.ifpart, flags);
2941 else if (n->nif.elsepart)
2942 evaltree(n->nif.elsepart, flags);
2958 struct builtincmd *bcmd;
2959 struct cmdentry entry;
2961 (bcmd = find_builtin(n->narg.text)) &&
2962 IS_BUILTIN_SPECIAL(bcmd)
2964 out2fmt("%s is a special built-in\n", n->narg.text);
2968 entry.cmdtype = CMDFUNCTION;
2969 entry.u.func = copyfunc(n->narg.next);
2970 addcmdentry(n->narg.text, &entry);
2975 evaltree(n->nnot.com, EV_TESTED);
2976 exitstatus = !exitstatus;
2984 evalcommand(n, flags);
2989 printf("Node type = %d\n", n->type);
2998 (checkexit && eflag && exitstatus && !(flags & EV_TESTED))
3000 exitshell(exitstatus);
3004 * Kick off a subshell to evaluate a tree.
3008 evalsubshell(const union node *n, int flags)
3011 int backgnd = (n->type == NBACKGND);
3013 expredir(n->nredir.redirect);
3015 if (forkshell(jp, n, backgnd) == 0) {
3017 flags &=~ EV_TESTED;
3018 redirect(n->nredir.redirect, 0);
3019 evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */
3023 exitstatus = waitforjob(jp);
3029 * Compute the names of the files in a redirection list.
3032 static void fixredir(union node *n, const char *text, int err);
3035 expredir(union node *n)
3039 for (redir = n ; redir ; redir = redir->nfile.next) {
3041 fn.lastp = &fn.list;
3042 oexitstatus = exitstatus;
3043 switch (redir->type) {
3049 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
3050 redir->nfile.expfname = fn.list->text;
3054 if (redir->ndup.vname) {
3055 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
3056 fixredir(redir, fn.list->text, 1);
3065 * Execute a command inside back quotes. If it's a builtin command, we
3066 * want to save its output in a block obtained from malloc. Otherwise
3067 * we fork off a subprocess and get the output of the command via a pipe.
3068 * Should be called with interrupts off.
3072 evalbackcmd(union node *n, struct backcmd *result)
3076 struct stackmark smark; /* unnecessary */
3078 setstackmark(&smark);
3089 error("Pipe call failed");
3091 if (forkshell(jp, n, FORK_NOJOB) == 0) {
3096 dup_as_newfd(pip[1], 1);
3100 evaltree(n, EV_EXIT);
3103 result->fd = pip[0];
3106 popstackmark(&smark);
3107 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
3108 result->fd, result->buf, result->nleft, result->jp));
3113 * Execute a simple command.
3117 * Search for a command. This is called before we fork so that the
3118 * location of the command will be available in the parent as well as
3119 * the child. The check for "goodname" is an overly conservative
3120 * check that the name will not be subject to expansion.
3127 struct cmdentry entry;
3129 if (n->type == NCMD && n->ncmd.args)
3130 if (goodname(n->ncmd.args->narg.text))
3131 find_command(n->ncmd.args->narg.text, &entry, 0,
3137 * Builtin commands. Builtin commands whose functions are closely
3138 * tied to evaluation are implemented here.
3142 * No command given, or a bltin command with no arguments. Set the
3143 * specified variables.
3147 bltincmd(argc, argv)
3152 * Preserve exitstatus of a previous possible redirection
3160 * Handle break and continue commands. Break, continue, and return are
3161 * all handled by setting the evalskip flag. The evaluation routines
3162 * above all check this flag, and if it is set they start skipping
3163 * commands rather than executing them. The variable skipcount is
3164 * the number of loops to break/continue, or the number of function
3165 * levels to return. (The latter is always 1.) It should probably
3166 * be an error to break out of more loops than exist, but it isn't
3167 * in the standard shell so we don't make it one here.
3171 breakcmd(argc, argv)
3175 int n = argc > 1 ? number(argv[1]) : 1;
3180 evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
3188 * The return command.
3192 returncmd(argc, argv)
3196 int ret = argc > 1 ? number(argv[1]) : oexitstatus;
3199 evalskip = SKIPFUNC;
3204 /* Do what ksh does; skip the rest of the file */
3205 evalskip = SKIPFILE;
3212 #ifndef BB_TRUE_FALSE
3214 false_main(argc, argv)
3223 true_main(argc, argv)
3232 * Controls whether the shell is interactive or not.
3235 static void setsignal(int signo);
3236 static void chkmail(int silent);
3240 setinteractive(int on)
3242 static int is_interactive;
3243 static int do_banner=0;
3245 if (on == is_interactive)
3251 is_interactive = on;
3252 if (do_banner==0 && is_interactive) {
3253 /* Looks like they want an interactive shell */
3254 printf( "\n\n" BB_BANNER " Built-in shell (ash)\n");
3255 printf( "Enter 'help' for a list of built-in commands.\n\n");
3263 setinteractive(iflag);
3276 iflag = 0; /* exit on error */
3279 for (sp = cmdenviron; sp ; sp = sp->next)
3280 setvareq(sp->text, VEXPORT|VSTACK);
3281 shellexec(argv + 1, environment(), pathval(), 0);
3287 eprintlist(struct strlist *sp)
3289 for (; sp; sp = sp->next) {
3290 out2fmt(" %s",sp->text);
3295 * Exec a program. Never returns. If you change this routine, you may
3296 * have to change the find_command routine as well.
3299 static const char *pathopt; /* set by padvance */
3302 shellexec(argv, envp, path, idx)
3303 char **argv, **envp;
3310 if (strchr(argv[0], '/') != NULL) {
3311 tryexec(argv[0], argv, envp);
3315 while ((cmdname = padvance(&path, argv[0])) != NULL) {
3316 if (--idx < 0 && pathopt == NULL) {
3317 tryexec(cmdname, argv, envp);
3318 if (errno != ENOENT && errno != ENOTDIR)
3325 /* Map to POSIX errors */
3337 exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
3342 * Clear traps on a fork.
3348 for (tp = trap ; tp < &trap[NSIG] ; tp++) {
3349 if (*tp && **tp) { /* trap not NULL or SIG_IGN */
3354 setsignal(tp - trap);
3362 initshellproc(void) {
3388 /* from options.c: */
3392 for (i = 0; i < NOPTS; i++)
3408 for (sm = sigmode ; sm < sigmode + NSIG - 1; sm++) {
3420 static int preadbuffer(void);
3421 static void pushfile (void);
3424 * Read a character from the script, returning PEOF on end of file.
3425 * Nul characters in the input are silently discarded.
3428 #ifndef ASH_OPTIMIZE_FOR_SIZE
3429 #define pgetc_macro() (--parsenleft >= 0? *parsenextc++ : preadbuffer())
3433 return pgetc_macro();
3439 return --parsenleft >= 0? *parsenextc++ : preadbuffer();
3445 return pgetc_macro();
3451 * Undo the last call to pgetc. Only one character may be pushed back.
3452 * PEOF may be pushed back.
3464 struct parsefile *pf = parsefile;
3473 parsefile = pf->prev;
3475 parsenleft = parsefile->nleft;
3476 parselleft = parsefile->lleft;
3477 parsenextc = parsefile->nextc;
3478 plinno = parsefile->linno;
3484 * Return to top level.
3489 while (parsefile != &basepf)
3494 * Close the file(s) that the shell is reading commands from. Called
3495 * after a fork is done.
3501 if (parsefile->fd > 0) {
3502 close(parsefile->fd);
3509 * Like setinputfile, but takes an open file descriptor. Call this with
3514 setinputfd(fd, push)
3517 (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
3523 while (parsefile->strpush)
3527 if (parsefile->buf == NULL)
3528 parsefile->buf = ckmalloc(BUFSIZ);
3529 parselleft = parsenleft = 0;
3535 * Set the input to take input from a file. If push is set, push the
3536 * old input onto the stack first.
3540 setinputfile(const char *fname, int push)
3546 if ((fd = open(fname, O_RDONLY)) < 0)
3547 error("Can't open %s", fname);
3549 myfileno2 = dup_as_newfd(fd, 10);
3552 error("Out of file descriptors");
3555 setinputfd(fd, push);
3561 tryexec(char *cmd, char **argv, char **envp)
3565 #ifdef BB_FEATURE_SH_STANDALONE_SHELL
3569 #ifdef BB_FEATURE_SH_APPLETS_ALWAYS_WIN
3570 name = get_last_path_component(name);
3573 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++)
3576 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++)
3578 run_applet_by_name(name, argc_l, argv);
3580 execve(cmd, argv, envp);
3585 setinputfile(cmd, 0);
3586 commandname = arg0 = savestr(argv[0]);
3588 exraise(EXSHELLPROC);
3593 static char *commandtext (const union node *);
3596 * Do a path search. The variable path (passed by reference) should be
3597 * set to the start of the path before the first call; padvance will update
3598 * this value as it proceeds. Successive calls to padvance will return
3599 * the possible path expansions in sequence. If an option (indicated by
3600 * a percent sign) appears in the path entry then the global variable
3601 * pathopt will be set to point to it; otherwise pathopt will be set to
3605 static const char *pathopt;
3607 static void growstackblock(void);
3611 padvance(const char **path, const char *name)
3621 for (p = start ; *p && *p != ':' && *p != '%' ; p++);
3622 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
3623 while (stackblocksize() < len)
3627 memcpy(q, start, p - start);
3635 while (*p && *p != ':') p++;
3641 return stalloc(len);
3645 * Wrapper around strcmp for qsort/bsearch/...
3648 pstrcmp(const void *a, const void *b)
3650 return strcmp((const char *) a, (*(const char *const *) b) + 1);
3654 * Find a keyword is in a sorted array.
3657 static const char *const *
3658 findkwd(const char *s)
3660 return bsearch(s, tokname_array + KWDOFFSET,
3661 (sizeof(tokname_array)/sizeof(const char *)) - KWDOFFSET,
3662 sizeof(const char *), pstrcmp);
3666 /*** Command hashing code ***/
3674 struct tblentry **pp;
3675 struct tblentry *cmdp;
3678 struct cmdentry entry;
3681 const struct alias *ap;
3685 while ((c = nextopt("rvV")) != '\0') {
3689 } else if (c == 'v' || c == 'V') {
3693 if (*argptr == NULL) {
3694 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
3695 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
3696 if (cmdp->cmdtype != CMDBUILTIN) {
3697 printentry(cmdp, verbose);
3704 while ((name = *argptr++) != NULL) {
3705 if ((cmdp = cmdlookup(name, 0)) != NULL
3706 && (cmdp->cmdtype == CMDNORMAL
3707 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
3710 /* Then look at the aliases */
3711 if ((ap = lookupalias(name, 0)) != NULL) {
3713 printf("%s is an alias for %s\n", name, ap->val);
3719 /* First look at the keywords */
3720 if (findkwd(name)!=0) {
3722 printf("%s is a shell keyword\n", name);
3724 printf(snlfmt, name);
3728 find_command(name, &entry, DO_ERR, pathval());
3729 if (entry.cmdtype == CMDUNKNOWN) c = 1;
3731 cmdp = cmdlookup(name, 0);
3732 if (cmdp) printentry(cmdp, verbose=='v');
3740 printentry(cmdp, verbose)
3741 struct tblentry *cmdp;
3748 printf("%s%s", cmdp->cmdname, (verbose ? " is " : ""));
3749 if (cmdp->cmdtype == CMDNORMAL) {
3750 idx = cmdp->param.index;
3753 name = padvance(&path, cmdp->cmdname);
3755 } while (--idx >= 0);
3758 } else if (cmdp->cmdtype == CMDBUILTIN) {
3760 out1str("a shell builtin");
3761 } else if (cmdp->cmdtype == CMDFUNCTION) {
3764 out1str("a function\n");
3765 name = commandtext(cmdp->param.func);
3766 printf("%s() {\n %s\n}", cmdp->cmdname, name);
3772 error("internal error: cmdtype %d", cmdp->cmdtype);
3775 printf(snlfmt, cmdp->rehash ? "*" : nullstr);
3780 /*** List the available builtins ***/
3783 static int helpcmd(int argc, char** argv)
3787 printf("\nBuilt-in commands:\n-------------------\n");
3788 for (col=0, i=0; i < NUMBUILTINS; i++) {
3789 col += printf("%c%s", ((col == 0) ? '\t' : ' '),
3790 builtincmds[i].name+1);
3796 #ifdef BB_FEATURE_SH_STANDALONE_SHELL
3798 extern const struct BB_applet applets[];
3799 extern const size_t NUM_APPLETS;
3801 for (i=0; i < NUM_APPLETS; i++) {
3803 col += printf("%c%s", ((col == 0) ? '\t' : ' '),
3813 return EXIT_SUCCESS;
3817 * Resolve a command name. If you change this routine, you may have to
3818 * change the shellexec routine as well.
3821 static int prefix (const char *, const char *);
3824 find_command(const char *name, struct cmdentry *entry, int act, const char *path)
3826 struct tblentry *cmdp;
3836 struct builtincmd *bcmd;
3838 /* If name contains a slash, don't use the hash table */
3839 if (strchr(name, '/') != NULL) {
3841 while (stat(name, &statb) < 0) {
3842 if (errno != ENOENT && errno != ENOTDIR)
3844 entry->cmdtype = CMDUNKNOWN;
3845 entry->u.index = -1;
3848 entry->cmdtype = CMDNORMAL;
3849 entry->u.index = -1;
3852 entry->cmdtype = CMDNORMAL;
3858 if (act & DO_BRUTE) {
3859 firstchange = path_change(path, &bltin);
3865 /* If name is in the table, and not invalidated by cd, we're done */
3866 if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0) {
3867 if (cmdp->cmdtype == CMDFUNCTION) {
3868 if (act & DO_NOFUN) {
3873 } else if (act & DO_BRUTE) {
3874 if ((cmdp->cmdtype == CMDNORMAL &&
3875 cmdp->param.index >= firstchange) ||
3876 (cmdp->cmdtype == CMDBUILTIN &&
3877 ((builtinloc < 0 && bltin >= 0) ?
3878 bltin : builtinloc) >= firstchange)) {
3879 /* need to recompute the entry */
3888 bcmd = find_builtin(name);
3889 regular = bcmd && IS_BUILTIN_REGULAR(bcmd);
3892 if (cmdp && (cmdp->cmdtype == CMDBUILTIN)) {
3895 } else if (act & DO_BRUTE) {
3896 if (firstchange == 0) {
3901 /* If %builtin not in path, check for builtin next */
3902 if (regular || (bltin < 0 && bcmd)) {
3905 entry->cmdtype = CMDBUILTIN;
3906 entry->u.cmd = bcmd;
3910 cmdp = cmdlookup(name, 1);
3911 cmdp->cmdtype = CMDBUILTIN;
3912 cmdp->param.cmd = bcmd;
3917 /* We have to search path. */
3918 prev = -1; /* where to start */
3919 if (cmdp && cmdp->rehash) { /* doing a rehash */
3920 if (cmdp->cmdtype == CMDBUILTIN)
3923 prev = cmdp->param.index;
3929 while ((fullname = padvance(&path, name)) != NULL) {
3930 stunalloc(fullname);
3932 if (idx >= firstchange) {
3936 if (prefix("builtin", pathopt)) {
3937 if ((bcmd = find_builtin(name))) {
3941 } else if (!(act & DO_NOFUN) &&
3942 prefix("func", pathopt)) {
3945 continue; /* ignore unimplemented options */
3948 /* if rehash, don't redo absolute path names */
3949 if (fullname[0] == '/' && idx <= prev &&
3950 idx < firstchange) {
3953 TRACE(("searchexec \"%s\": no change\n", name));
3956 while (stat(fullname, &statb) < 0) {
3957 if (errno != ENOENT && errno != ENOTDIR)
3961 e = EACCES; /* if we fail, this will be the error */
3962 if (!S_ISREG(statb.st_mode))
3964 if (pathopt) { /* this is a %func directory */
3965 stalloc(strlen(fullname) + 1);
3966 readcmdfile(fullname);
3967 if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
3968 error("%s not defined in %s", name, fullname);
3969 stunalloc(fullname);
3972 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
3973 /* If we aren't called with DO_BRUTE and cmdp is set, it must
3974 be a function and we're being called with DO_NOFUN */
3976 entry->cmdtype = CMDNORMAL;
3977 entry->u.index = idx;
3981 cmdp = cmdlookup(name, 1);
3982 cmdp->cmdtype = CMDNORMAL;
3983 cmdp->param.index = idx;
3988 /* We failed. If there was an entry for this command, delete it */
3989 if (cmdp && updatetbl)
3992 out2fmt("%s: %s\n", name, errmsg(e, E_EXEC));
3993 entry->cmdtype = CMDUNKNOWN;
3998 entry->cmdtype = cmdp->cmdtype;
3999 entry->u = cmdp->param;
4005 * Search the table of builtin commands.
4009 bstrcmp(const void *name, const void *b)
4011 return strcmp((const char *)name, (*(const char *const *) b)+1);
4014 static struct builtincmd *
4015 find_builtin(const char *name)
4017 struct builtincmd *bp;
4019 bp = bsearch(name, builtincmds, NUMBUILTINS, sizeof(struct builtincmd),
4027 * Called when a cd is done. Marks all commands so the next time they
4028 * are executed they will be rehashed.
4033 struct tblentry **pp;
4034 struct tblentry *cmdp;
4036 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
4037 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
4038 if (cmdp->cmdtype == CMDNORMAL
4039 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
4048 * Called before PATH is changed. The argument is the new value of PATH;
4049 * pathval() still returns the old value at this point. Called with
4054 changepath(const char *newval)
4059 firstchange = path_change(newval, &bltin);
4060 if (builtinloc < 0 && bltin >= 0)
4061 builtinloc = bltin; /* zap builtins */
4062 clearcmdentry(firstchange);
4068 * Clear out command entries. The argument specifies the first entry in
4069 * PATH which has changed.
4073 clearcmdentry(firstchange)
4076 struct tblentry **tblp;
4077 struct tblentry **pp;
4078 struct tblentry *cmdp;
4081 for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
4083 while ((cmdp = *pp) != NULL) {
4084 if ((cmdp->cmdtype == CMDNORMAL &&
4085 cmdp->param.index >= firstchange)
4086 || (cmdp->cmdtype == CMDBUILTIN &&
4087 builtinloc >= firstchange)) {
4100 * Delete all functions.
4105 struct tblentry **tblp;
4106 struct tblentry **pp;
4107 struct tblentry *cmdp;
4110 for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
4112 while ((cmdp = *pp) != NULL) {
4113 if (cmdp->cmdtype == CMDFUNCTION) {
4115 freefunc(cmdp->param.func);
4128 * Locate a command in the command hash table. If "add" is nonzero,
4129 * add the command to the table if it is not already present. The
4130 * variable "lastcmdentry" is set to point to the address of the link
4131 * pointing to the entry, so that delete_cmd_entry can delete the
4135 static struct tblentry **lastcmdentry;
4137 static struct tblentry *
4138 cmdlookup(const char *name, int add)
4142 struct tblentry *cmdp;
4143 struct tblentry **pp;
4150 pp = &cmdtable[hashval % CMDTABLESIZE];
4151 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
4152 if (equal(cmdp->cmdname, name))
4156 if (add && cmdp == NULL) {
4158 cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
4159 + strlen(name) + 1);
4161 cmdp->cmdtype = CMDUNKNOWN;
4163 strcpy(cmdp->cmdname, name);
4171 * Delete the command entry returned on the last lookup.
4175 delete_cmd_entry() {
4176 struct tblentry *cmdp;
4179 cmdp = *lastcmdentry;
4180 *lastcmdentry = cmdp->next;
4189 static const unsigned char nodesize[26] = {
4190 ALIGN(sizeof (struct nbinary)),
4191 ALIGN(sizeof (struct ncmd)),
4192 ALIGN(sizeof (struct npipe)),
4193 ALIGN(sizeof (struct nredir)),
4194 ALIGN(sizeof (struct nredir)),
4195 ALIGN(sizeof (struct nredir)),
4196 ALIGN(sizeof (struct nbinary)),
4197 ALIGN(sizeof (struct nbinary)),
4198 ALIGN(sizeof (struct nif)),
4199 ALIGN(sizeof (struct nbinary)),
4200 ALIGN(sizeof (struct nbinary)),
4201 ALIGN(sizeof (struct nfor)),
4202 ALIGN(sizeof (struct ncase)),
4203 ALIGN(sizeof (struct nclist)),
4204 ALIGN(sizeof (struct narg)),
4205 ALIGN(sizeof (struct narg)),
4206 ALIGN(sizeof (struct nfile)),
4207 ALIGN(sizeof (struct nfile)),
4208 ALIGN(sizeof (struct nfile)),
4209 ALIGN(sizeof (struct nfile)),
4210 ALIGN(sizeof (struct nfile)),
4211 ALIGN(sizeof (struct ndup)),
4212 ALIGN(sizeof (struct ndup)),
4213 ALIGN(sizeof (struct nhere)),
4214 ALIGN(sizeof (struct nhere)),
4215 ALIGN(sizeof (struct nnot)),
4221 * Delete a function if it exists.
4225 unsetfunc(char *name)
4227 struct tblentry *cmdp;
4229 if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
4230 freefunc(cmdp->param.func);
4237 * Locate and print what a word is...
4241 typecmd(int argc, char **argv)
4249 for (i = 1; i < argc; i++) {
4250 argv_a[0] = argv[i];
4253 err |= hashcmd(argc, argv);
4260 commandcmd(argc, argv)
4265 int default_path = 0;
4266 int verify_only = 0;
4267 int verbose_verify_only = 0;
4269 while ((c = nextopt("pvV")) != '\0')
4278 verbose_verify_only = 1;
4282 if (default_path + verify_only + verbose_verify_only > 1 ||
4285 "command [-p] command [arg ...]\n"
4286 "command {-v|-V} command\n");
4290 if (verify_only || verbose_verify_only) {
4294 argv_a[0] = *argptr;
4296 optptr = verbose_verify_only ? "v" : "V"; /* reverse special */
4297 return hashcmd(argc, argv);
4305 path_change(newval, bltin)
4309 const char *old, *new;
4315 firstchange = 9999; /* assume no change */
4321 if ((*old == '\0' && *new == ':')
4322 || (*old == ':' && *new == '\0'))
4324 old = new; /* ignore subsequent differences */
4328 if (*new == '%' && *bltin < 0 && prefix("builtin", new + 1))
4335 if (builtinloc >= 0 && *bltin < 0)
4340 * Routines to expand arguments to commands. We have to deal with
4341 * backquotes, shell variables, and file metacharacters.
4346 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
4347 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
4350 * Structure specifying which parts of the string should be searched
4351 * for IFS characters.
4355 struct ifsregion *next; /* next region in list */
4356 int begoff; /* offset of start of region */
4357 int endoff; /* offset of end of region */
4358 int nulonly; /* search for nul bytes only */
4362 static char *expdest; /* output of current string */
4363 static struct nodelist *argbackq; /* list of back quote expressions */
4364 static struct ifsregion ifsfirst; /* first struct in list of ifs regions */
4365 static struct ifsregion *ifslastp; /* last struct in list */
4366 static struct arglist exparg; /* holds expanded arg list */
4368 static void argstr (char *, int);
4369 static char *exptilde (char *, int);
4370 static void expbackq (union node *, int, int);
4371 static int subevalvar (char *, char *, int, int, int, int, int);
4372 static int varisset (char *, int);
4373 static void strtodest (const char *, int, int);
4374 static void varvalue (char *, int, int);
4375 static void recordregion (int, int, int);
4376 static void removerecordregions (int);
4377 static void ifsbreakup (char *, struct arglist *);
4378 static void ifsfree (void);
4379 static void expandmeta (struct strlist *, int);
4380 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
4381 #define preglob(p) _rmescapes((p), RMESCAPE_ALLOC | RMESCAPE_GLOB)
4382 #if !defined(GLOB_BROKEN)
4383 static void addglob (const glob_t *);
4386 #if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
4387 static void expmeta (char *, char *);
4389 #if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
4390 static struct strlist *expsort (struct strlist *);
4391 static struct strlist *msort (struct strlist *, int);
4393 static int patmatch (char *, char *, int);
4394 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
4395 static int patmatch2 (char *, char *, int);
4397 static int pmatch (char *, char *, int);
4398 #define patmatch2 patmatch
4400 static char *cvtnum (int, char *);
4403 * Expand shell variables and backquotes inside a here document.
4406 /* arg: the document, fd: where to write the expanded version */
4408 expandhere(union node *arg, int fd)
4411 expandarg(arg, (struct arglist *)NULL, 0);
4412 xwrite(fd, stackblock(), expdest - stackblock());
4417 * Perform variable substitution and command substitution on an argument,
4418 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
4419 * perform splitting and file name expansion. When arglist is NULL, perform
4420 * here document expansion.
4424 expandarg(arg, arglist, flag)
4426 struct arglist *arglist;
4432 argbackq = arg->narg.backquote;
4433 STARTSTACKSTR(expdest);
4434 ifsfirst.next = NULL;
4436 argstr(arg->narg.text, flag);
4437 if (arglist == NULL) {
4438 return; /* here document expanded */
4440 STPUTC('\0', expdest);
4441 p = grabstackstr(expdest);
4442 exparg.lastp = &exparg.list;
4446 if (flag & EXP_FULL) {
4447 ifsbreakup(p, &exparg);
4448 *exparg.lastp = NULL;
4449 exparg.lastp = &exparg.list;
4450 expandmeta(exparg.list, flag);
4452 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
4454 sp = (struct strlist *)stalloc(sizeof (struct strlist));
4457 exparg.lastp = &sp->next;
4460 *exparg.lastp = NULL;
4462 *arglist->lastp = exparg.list;
4463 arglist->lastp = exparg.lastp;
4469 * Expand a variable, and return a pointer to the next character in the
4473 static inline char *
4489 int quotes = flag & (EXP_FULL | EXP_CASE);
4492 subtype = varflags & VSTYPE;
4497 p = strchr(p, '=') + 1;
4498 again: /* jump here after setting a variable with ${var=text} */
4500 set = varisset(var, varflags & VSNUL);
4503 val = lookupvar(var);
4504 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
4511 startloc = expdest - stackblock();
4512 if (set && subtype != VSPLUS) {
4513 /* insert the value of the variable */
4515 varvalue(var, varflags & VSQUOTE, flag);
4516 if (subtype == VSLENGTH) {
4517 varlen = expdest - stackblock() - startloc;
4518 STADJUST(-varlen, expdest);
4521 if (subtype == VSLENGTH) {
4522 varlen = strlen(val);
4526 varflags & VSQUOTE ?
4527 DQSYNTAX : BASESYNTAX,
4534 if (subtype == VSPLUS)
4537 easy = ((varflags & VSQUOTE) == 0 ||
4538 (*var == '@' && shellparam.nparam != 1));
4543 expdest = cvtnum(varlen, expdest);
4550 recordregion(startloc, expdest - stackblock(),
4551 varflags & VSQUOTE);
4567 case VSTRIMRIGHTMAX:
4571 * Terminate the string and start recording the pattern
4574 STPUTC('\0', expdest);
4575 patloc = expdest - stackblock();
4576 if (subevalvar(p, NULL, patloc, subtype,
4577 startloc, varflags, quotes) == 0) {
4578 int amount = (expdest - stackblock() - patloc) + 1;
4579 STADJUST(-amount, expdest);
4581 /* Remove any recorded regions beyond start of variable */
4582 removerecordregions(startloc);
4588 if (subevalvar(p, var, 0, subtype, startloc,
4589 varflags, quotes)) {
4592 * Remove any recorded regions beyond
4595 removerecordregions(startloc);
4610 if (subtype != VSNORMAL) { /* skip to end of alternative */
4613 if ((c = *p++) == CTLESC)
4615 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
4617 argbackq = argbackq->next;
4618 } else if (c == CTLVAR) {
4619 if ((*p++ & VSTYPE) != VSNORMAL)
4621 } else if (c == CTLENDVAR) {
4632 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
4633 * characters to allow for further processing. Otherwise treat
4634 * $@ like $* since no splitting will be performed.
4643 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
4646 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
4647 p = exptilde(p, flag);
4651 case CTLENDVAR: /* ??? */
4654 /* "$@" syntax adherence hack */
4655 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
4657 if ((flag & EXP_FULL) != 0)
4667 p = evalvar(p, flag);
4670 case CTLBACKQ|CTLQUOTE:
4671 expbackq(argbackq->n, c & CTLQUOTE, flag);
4672 argbackq = argbackq->next;
4674 #ifdef ASH_MATH_SUPPORT
4682 * sort of a hack - expand tildes in variable
4683 * assignments (after the first '=' and after ':'s).
4686 if (flag & EXP_VARTILDE && *p == '~') {
4693 p = exptilde(p, flag);
4709 char c, *startp = p;
4712 int quotes = flag & (EXP_FULL | EXP_CASE);
4714 while ((c = *p) != '\0') {
4721 if (flag & EXP_VARTILDE)
4731 if (*(startp+1) == '\0') {
4732 if ((home = lookupvar("HOME")) == NULL)
4735 if ((pw = getpwnam(startp+1)) == NULL)
4742 strtodest(home, SQSYNTAX, quotes);
4751 removerecordregions(int endoff)
4753 if (ifslastp == NULL)
4756 if (ifsfirst.endoff > endoff) {
4757 while (ifsfirst.next != NULL) {
4758 struct ifsregion *ifsp;
4760 ifsp = ifsfirst.next->next;
4761 ckfree(ifsfirst.next);
4762 ifsfirst.next = ifsp;
4765 if (ifsfirst.begoff > endoff)
4768 ifslastp = &ifsfirst;
4769 ifsfirst.endoff = endoff;
4774 ifslastp = &ifsfirst;
4775 while (ifslastp->next && ifslastp->next->begoff < endoff)
4776 ifslastp=ifslastp->next;
4777 while (ifslastp->next != NULL) {
4778 struct ifsregion *ifsp;
4780 ifsp = ifslastp->next->next;
4781 ckfree(ifslastp->next);
4782 ifslastp->next = ifsp;
4785 if (ifslastp->endoff > endoff)
4786 ifslastp->endoff = endoff;
4790 #ifdef ASH_MATH_SUPPORT
4792 * Expand arithmetic expression. Backup to start of expression,
4793 * evaluate, place result in (backed up) result, adjust string position.
4802 int quotes = flag & (EXP_FULL | EXP_CASE);
4808 * This routine is slightly over-complicated for
4809 * efficiency. First we make sure there is
4810 * enough space for the result, which may be bigger
4811 * than the expression if we add exponentation. Next we
4812 * scan backwards looking for the start of arithmetic. If the
4813 * next previous character is a CTLESC character, then we
4814 * have to rescan starting from the beginning since CTLESC
4815 * characters have to be processed left to right.
4817 CHECKSTRSPACE(10, expdest);
4818 USTPUTC('\0', expdest);
4819 start = stackblock();
4821 while (*p != CTLARI && p >= start)
4824 error("missing CTLARI (shouldn't happen)");
4825 if (p > start && *(p-1) == CTLESC)
4826 for (p = start; *p != CTLARI; p++)
4835 removerecordregions(begoff);
4838 result = arith(p+2, &errcode);
4841 error("divide by zero");
4843 error("syntax error: \"%s\"\n", p+2);
4845 snprintf(p, 12, "%d", result);
4851 recordregion(begoff, p - 1 - start, 0);
4852 result = expdest - p + 1;
4853 STADJUST(-result, expdest);
4858 * Expand stuff in backwards quotes.
4862 expbackq(cmd, quoted, flag)
4867 volatile struct backcmd in;
4871 char *dest = expdest;
4872 volatile struct ifsregion saveifs;
4873 struct ifsregion *volatile savelastp;
4874 struct nodelist *volatile saveargbackq;
4876 int startloc = dest - stackblock();
4877 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
4878 volatile int saveherefd;
4879 int quotes = flag & (EXP_FULL | EXP_CASE);
4880 struct jmploc jmploc;
4881 struct jmploc *volatile savehandler;
4885 /* Avoid longjmp clobbering */
4896 savelastp = ifslastp;
4897 saveargbackq = argbackq;
4898 saveherefd = herefd;
4900 if ((ex = setjmp(jmploc.loc))) {
4903 savehandler = handler;
4906 p = grabstackstr(dest);
4907 evalbackcmd(cmd, (struct backcmd *) &in);
4908 ungrabstackstr(p, dest);
4912 ifslastp = savelastp;
4913 argbackq = saveargbackq;
4914 herefd = saveherefd;
4922 if (--in.nleft < 0) {
4925 i = safe_read(in.fd, buf, sizeof buf);
4926 TRACE(("expbackq: read returns %d\n", i));
4933 if (lastc != '\0') {
4934 if (quotes && SIT(lastc, syntax) == CCTL)
4935 STPUTC(CTLESC, dest);
4936 STPUTC(lastc, dest);
4940 /* Eat all trailing newlines */
4941 for (; dest > stackblock() && dest[-1] == '\n';)
4950 exitstatus = waitforjob(in.jp);
4951 handler = savehandler;
4953 longjmp(handler->loc, 1);
4956 recordregion(startloc, dest - stackblock(), 0);
4957 TRACE(("evalbackq: size=%d: \"%.*s\"\n",
4958 (dest - stackblock()) - startloc,
4959 (dest - stackblock()) - startloc,
4960 stackblock() + startloc));
4966 subevalvar(p, str, strloc, subtype, startloc, varflags, quotes)
4979 int saveherefd = herefd;
4980 struct nodelist *saveargbackq = argbackq;
4984 argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0);
4985 STACKSTRNUL(expdest);
4986 herefd = saveherefd;
4987 argbackq = saveargbackq;
4988 startp = stackblock() + startloc;
4990 str = stackblock() + strloc;
4994 setvar(str, startp, 0);
4995 amount = startp - expdest;
4996 STADJUST(amount, expdest);
5003 if (*p != CTLENDVAR) {
5004 out2fmt(snlfmt, startp);
5005 error((char *)NULL);
5007 error("%.*s: parameter %snot set", p - str - 1,
5008 str, (varflags & VSNUL) ? "null or "
5013 for (loc = startp; loc < str; loc++) {
5016 if (patmatch2(str, startp, quotes))
5019 if (quotes && *loc == CTLESC)
5025 for (loc = str - 1; loc >= startp;) {
5028 if (patmatch2(str, startp, quotes))
5032 if (quotes && loc > startp && *(loc - 1) == CTLESC) {
5033 for (q = startp; q < loc; q++)
5043 for (loc = str - 1; loc >= startp;) {
5044 if (patmatch2(str, loc, quotes))
5047 if (quotes && loc > startp && *(loc - 1) == CTLESC) {
5048 for (q = startp; q < loc; q++)
5057 case VSTRIMRIGHTMAX:
5058 for (loc = startp; loc < str - 1; loc++) {
5059 if (patmatch2(str, loc, quotes))
5061 if (quotes && *loc == CTLESC)
5074 amount = ((str - 1) - (loc - startp)) - expdest;
5075 STADJUST(amount, expdest);
5076 while (loc != str - 1)
5081 amount = loc - expdest;
5082 STADJUST(amount, expdest);
5083 STPUTC('\0', expdest);
5084 STADJUST(-1, expdest);
5090 * Test whether a specialized variable is set.
5094 varisset(name, nulok)
5099 return backgndpid != -1;
5100 else if (*name == '@' || *name == '*') {
5101 if (*shellparam.p == NULL)
5107 for (av = shellparam.p; *av; av++)
5112 } else if (is_digit(*name)) {
5114 int num = atoi(name);
5116 if (num > shellparam.nparam)
5122 ap = shellparam.p[num - 1];
5124 if (nulok && (ap == NULL || *ap == '\0'))
5131 * Put a string on the stack.
5135 strtodest(const char *p, int syntax, int quotes)
5138 if (quotes && SIT(*p,syntax) == CCTL)
5139 STPUTC(CTLESC, expdest);
5140 STPUTC(*p++, expdest);
5145 * Add the value of a specialized variable to the stack string.
5149 varvalue(char *name, int quoted, int flags)
5158 int allow_split = flags & EXP_FULL;
5159 int quotes = flags & (EXP_FULL | EXP_CASE);
5161 syntax = quoted ? DQSYNTAX : BASESYNTAX;
5170 num = shellparam.nparam;
5175 expdest = cvtnum(num, expdest);
5178 for (i = 0 ; i < NOPTS ; i++) {
5180 STPUTC(optent_letter(optlist[i]), expdest);
5184 if (allow_split && quoted) {
5185 sep = 1 << CHAR_BIT;
5190 sep = ifsset() ? ifsval()[0] : ' ';
5192 sepq = SIT(sep,syntax) == CCTL;
5195 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
5196 strtodest(p, syntax, quotes);
5199 STPUTC(CTLESC, expdest);
5200 STPUTC(sep, expdest);
5205 strtodest(arg0, syntax, quotes);
5209 if (num > 0 && num <= shellparam.nparam) {
5210 strtodest(shellparam.p[num - 1], syntax, quotes);
5218 * Record the fact that we have to scan this region of the
5219 * string for IFS characters.
5223 recordregion(start, end, nulonly)
5228 struct ifsregion *ifsp;
5230 if (ifslastp == NULL) {
5234 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
5236 ifslastp->next = ifsp;
5240 ifslastp->begoff = start;
5241 ifslastp->endoff = end;
5242 ifslastp->nulonly = nulonly;
5248 * Break the argument string into pieces based upon IFS and add the
5249 * strings to the argument list. The regions of the string to be
5250 * searched for IFS characters have been stored by recordregion.
5253 ifsbreakup(string, arglist)
5255 struct arglist *arglist;
5257 struct ifsregion *ifsp;
5262 const char *ifs, *realifs;
5270 realifs = ifsset() ? ifsval() : defifs;
5271 if (ifslastp != NULL) {
5274 p = string + ifsp->begoff;
5275 nulonly = ifsp->nulonly;
5276 ifs = nulonly ? nullstr : realifs;
5278 while (p < string + ifsp->endoff) {
5282 if (strchr(ifs, *p)) {
5284 ifsspc = (strchr(defifs, *p) != NULL);
5285 /* Ignore IFS whitespace at start */
5286 if (q == start && ifsspc) {
5292 sp = (struct strlist *)stalloc(sizeof *sp);
5294 *arglist->lastp = sp;
5295 arglist->lastp = &sp->next;
5299 if (p >= string + ifsp->endoff) {
5305 if (strchr(ifs, *p) == NULL ) {
5308 } else if (strchr(defifs, *p) == NULL) {
5324 } while ((ifsp = ifsp->next) != NULL);
5325 if (!(*start || (!ifsspc && start > string && nulonly))) {
5330 sp = (struct strlist *)stalloc(sizeof *sp);
5332 *arglist->lastp = sp;
5333 arglist->lastp = &sp->next;
5339 while (ifsfirst.next != NULL) {
5340 struct ifsregion *ifsp;
5342 ifsp = ifsfirst.next->next;
5343 ckfree(ifsfirst.next);
5344 ifsfirst.next = ifsp;
5348 ifsfirst.next = NULL;
5352 * Add a file name to the list.
5356 addfname(const char *name)
5362 sp = (struct strlist *)stalloc(sizeof *sp);
5365 exparg.lastp = &sp->next;
5369 * Expand shell metacharacters. At this point, the only control characters
5370 * should be escapes. The results are stored in the list exparg.
5373 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN)
5375 expandmeta(str, flag)
5376 struct strlist *str;
5381 /* TODO - EXP_REDIR */
5386 p = preglob(str->text);
5388 switch (glob(p, 0, 0, &pglob)) {
5390 if(pglob.gl_pathv[1]==0 && !strcmp(p, pglob.gl_pathv[0]))
5401 *exparg.lastp = str;
5402 rmescapes(str->text);
5403 exparg.lastp = &str->next;
5405 default: /* GLOB_NOSPACE */
5406 error("Out of space");
5414 * Add the result of glob(3) to the list.
5419 const glob_t *pglob;
5421 char **p = pglob->gl_pathv;
5429 #else /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
5430 static char *expdir;
5434 expandmeta(str, flag)
5435 struct strlist *str;
5439 struct strlist **savelastp;
5442 /* TODO - EXP_REDIR */
5448 for (;;) { /* fast check for meta chars */
5449 if ((c = *p++) == '\0')
5451 if (c == '*' || c == '?' || c == '[' || c == '!')
5454 savelastp = exparg.lastp;
5456 if (expdir == NULL) {
5457 int i = strlen(str->text);
5458 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
5461 expmeta(expdir, str->text);
5465 if (exparg.lastp == savelastp) {
5470 *exparg.lastp = str;
5471 rmescapes(str->text);
5472 exparg.lastp = &str->next;
5474 *exparg.lastp = NULL;
5475 *savelastp = sp = expsort(*savelastp);
5476 while (sp->next != NULL)
5478 exparg.lastp = &sp->next;
5486 * Do metacharacter (i.e. *, ?, [...]) expansion.
5490 expmeta(enddir, name)
5508 for (p = name ; ; p++) {
5509 if (*p == '*' || *p == '?')
5511 else if (*p == '[') {
5516 while (*q == CTLQUOTEMARK)
5520 if (*q == '/' || *q == '\0')
5527 } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) {
5529 } else if (*p == '\0')
5531 else if (*p == CTLQUOTEMARK)
5533 else if (*p == CTLESC)
5541 if (metaflag == 0) { /* we've reached the end of the file name */
5542 if (enddir != expdir)
5544 for (p = name ; ; p++) {
5545 if (*p == CTLQUOTEMARK)
5553 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
5558 if (start != name) {
5561 while (*p == CTLQUOTEMARK)
5568 if (enddir == expdir) {
5570 } else if (enddir == expdir + 1 && *expdir == '/') {
5576 if ((dirp = opendir(cp)) == NULL)
5578 if (enddir != expdir)
5580 if (*endname == 0) {
5588 while (*p == CTLQUOTEMARK)
5594 while (! int_pending() && (dp = readdir(dirp)) != NULL) {
5595 if (dp->d_name[0] == '.' && ! matchdot)
5597 if (patmatch(start, dp->d_name, 0)) {
5599 strcpy(enddir, dp->d_name);
5602 for (p = enddir, cp = dp->d_name;
5603 (*p++ = *cp++) != '\0';)
5606 expmeta(p, endname);
5614 #endif /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
5618 #if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
5620 * Sort the results of file name expansion. It calculates the number of
5621 * strings to sort and then calls msort (short for merge sort) to do the
5625 static struct strlist *
5627 struct strlist *str;
5633 for (sp = str ; sp ; sp = sp->next)
5635 return msort(str, len);
5639 static struct strlist *
5641 struct strlist *list;
5644 struct strlist *p, *q = NULL;
5645 struct strlist **lpp;
5653 for (n = half ; --n >= 0 ; ) {
5657 q->next = NULL; /* terminate first half of list */
5658 q = msort(list, half); /* sort first half of list */
5659 p = msort(p, len - half); /* sort second half */
5662 if (strcmp(p->text, q->text) < 0) {
5665 if ((p = *lpp) == NULL) {
5672 if ((q = *lpp) == NULL) {
5685 * Returns true if the pattern matches the string.
5688 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
5689 /* squoted: string might have quote chars */
5691 patmatch(char *pattern, char *string, int squoted)
5696 p = preglob(pattern);
5697 q = squoted ? _rmescapes(string, RMESCAPE_ALLOC) : string;
5699 return !fnmatch(p, q, 0);
5704 patmatch2(char *pattern, char *string, int squoted)
5710 p = grabstackstr(expdest);
5711 res = patmatch(pattern, string, squoted);
5712 ungrabstackstr(p, expdest);
5717 patmatch(char *pattern, char *string, int squoted) {
5718 return pmatch(pattern, string, squoted);
5723 pmatch(char *pattern, char *string, int squoted)
5735 if (squoted && *q == CTLESC)
5743 if (squoted && *q == CTLESC)
5750 while (c == CTLQUOTEMARK || c == '*')
5752 if (c != CTLESC && c != CTLQUOTEMARK &&
5753 c != '?' && c != '*' && c != '[') {
5755 if (squoted && *q == CTLESC &&
5760 if (squoted && *q == CTLESC)
5766 if (pmatch(p, q, squoted))
5768 if (squoted && *q == CTLESC)
5770 } while (*q++ != '\0');
5781 while (*endp == CTLQUOTEMARK)
5784 goto dft; /* no matching ] */
5785 if (*endp == CTLESC)
5797 if (squoted && chr == CTLESC)
5803 if (c == CTLQUOTEMARK)
5807 if (*p == '-' && p[1] != ']') {
5809 while (*p == CTLQUOTEMARK)
5813 if (chr >= c && chr <= *p)
5820 } while ((c = *p++) != ']');
5821 if (found == invert)
5826 if (squoted && *q == CTLESC)
5843 * Remove any CTLESC characters from a string.
5846 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
5848 _rmescapes(char *str, int flag)
5851 static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 };
5853 p = strpbrk(str, qchars);
5859 if (flag & RMESCAPE_ALLOC) {
5860 size_t len = p - str;
5861 q = r = stalloc(strlen(p) + len + 1);
5863 memcpy(q, str, len);
5868 if (*p == CTLQUOTEMARK) {
5874 if (flag & RMESCAPE_GLOB && *p != '/') {
5891 while (*p != CTLESC && *p != CTLQUOTEMARK) {
5897 if (*p == CTLQUOTEMARK) {
5912 * See if a pattern matches in a case statement.
5916 casematch(union node *pattern, const char *val)
5918 struct stackmark smark;
5922 setstackmark(&smark);
5923 argbackq = pattern->narg.backquote;
5924 STARTSTACKSTR(expdest);
5926 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
5927 STPUTC('\0', expdest);
5928 p = grabstackstr(expdest);
5929 result = patmatch(p, (char *)val, 0);
5930 popstackmark(&smark);
5945 CHECKSTRSPACE(32, buf);
5946 len = sprintf(buf, "%d", num);
5951 * Editline and history functions (and glue).
5953 static int histcmd(argc, argv)
5957 error("not compiled with history support");
5963 struct redirtab *next;
5964 short renamed[10]; /* Current ash support only 0-9 descriptors */
5965 /* char on arm (and others) can't be negative */
5968 static struct redirtab *redirlist;
5970 extern char **environ;
5975 * Initialization code.
5988 basepf.nextc = basepf.buf = basebuf;
5997 for (envp = environ ; *envp ; envp++) {
5998 if (strchr(*envp, '=')) {
5999 setvareq(*envp, VEXPORT|VTEXTFIXED);
6003 snprintf(ppid, sizeof(ppid), "%d", (int) getppid());
6004 setvar("PPID", ppid, 0);
6011 * This routine is called when an error or an interrupt occurs in an
6012 * interactive shell and control is returned to the main command loop.
6015 /* 1 == check for aliases, 2 == also check for assignments */
6016 static int checkalias; /* also used in no alias mode for check assignments */
6030 if (exception != EXSHELLPROC)
6031 parselleft = parsenleft = 0; /* clear input buffer */
6035 /* from parser.c: */
6053 * This file implements the input routines used by the parser.
6056 #ifdef BB_FEATURE_COMMAND_EDITING
6057 static const char * cmdedit_prompt;
6058 static inline void putprompt(const char *s) {
6062 static inline void putprompt(const char *s) {
6067 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
6072 * Same as pgetc(), but ignores PEOA.
6082 } while (c == PEOA);
6086 static inline int pgetc2() { return pgetc_macro(); }
6090 * Read a line from the script.
6093 static inline char *
6094 pfgets(char *line, int len)
6100 while (--nleft > 0) {
6119 char *buf = parsefile->buf;
6123 #ifdef BB_FEATURE_COMMAND_EDITING
6125 if (!iflag || parsefile->fd)
6126 nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
6128 nr = cmdedit_read_input((char*)cmdedit_prompt, buf);
6132 nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
6136 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
6137 int flags = fcntl(0, F_GETFL, 0);
6138 if (flags >= 0 && flags & O_NONBLOCK) {
6139 flags &=~ O_NONBLOCK;
6140 if (fcntl(0, F_SETFL, flags) >= 0) {
6141 out2str("sh: turning off NDELAY mode\n");
6153 struct strpush *sp = parsefile->strpush;
6158 if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
6163 if (sp->string != sp->ap->val) {
6167 sp->ap->flag &= ~ALIASINUSE;
6168 if (sp->ap->flag & ALIASDEAD) {
6169 unalias(sp->ap->name);
6173 parsenextc = sp->prevstring;
6174 parsenleft = sp->prevnleft;
6175 /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
6176 parsefile->strpush = sp->prev;
6177 if (sp != &(parsefile->basestrpush))
6184 * Refill the input buffer and return the next input character:
6186 * 1) If a string was pushed back on the input, pop it;
6187 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
6188 * from a string so we can't refill the buffer, return EOF.
6189 * 3) If the is more stuff in this buffer, use it else call read to fill it.
6190 * 4) Process input up to the next newline, deleting nul characters.
6200 while (parsefile->strpush) {
6202 if (parsenleft == -1 && parsefile->strpush->ap &&
6203 parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
6208 if (--parsenleft >= 0)
6209 return (*parsenextc++);
6211 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
6216 if (parselleft <= 0) {
6217 if ((parselleft = preadfd()) <= 0) {
6218 parselleft = parsenleft = EOF_NLEFT;
6225 /* delete nul characters */
6226 for (more = 1; more;) {
6234 parsenleft = q - parsenextc;
6235 more = 0; /* Stop processing here */
6241 if (--parselleft <= 0 && more) {
6242 parsenleft = q - parsenextc - 1;
6253 out2str(parsenextc);
6258 return *parsenextc++;
6263 * Push a string back onto the input at this current parsefile level.
6264 * We handle aliases this way.
6267 pushstring(char *s, int len, void *ap)
6272 /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
6273 if (parsefile->strpush) {
6274 sp = ckmalloc(sizeof (struct strpush));
6275 sp->prev = parsefile->strpush;
6276 parsefile->strpush = sp;
6278 sp = parsefile->strpush = &(parsefile->basestrpush);
6279 sp->prevstring = parsenextc;
6280 sp->prevnleft = parsenleft;
6282 sp->ap = (struct alias *)ap;
6284 ((struct alias *)ap)->flag |= ALIASINUSE;
6295 * Like setinputfile, but takes input from a string.
6299 setinputstring(char *string)
6303 parsenextc = string;
6304 parsenleft = strlen(string);
6305 parsefile->buf = NULL;
6313 * To handle the "." command, a stack of input files is used. Pushfile
6314 * adds a new entry to the stack and popfile restores the previous level.
6319 struct parsefile *pf;
6321 parsefile->nleft = parsenleft;
6322 parsefile->lleft = parselleft;
6323 parsefile->nextc = parsenextc;
6324 parsefile->linno = plinno;
6325 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
6326 pf->prev = parsefile;
6329 pf->basestrpush.prev = NULL;
6334 static void restartjob (struct job *);
6336 static void freejob (struct job *);
6337 static struct job *getjob (const char *);
6338 static int dowait (int, struct job *);
6339 static void waitonint(int);
6343 * We keep track of whether or not fd0 has been redirected. This is for
6344 * background commands, where we want to redirect fd0 to /dev/null only
6345 * if it hasn't already been redirected.
6347 static int fd0_redirected = 0;
6349 /* Return true if fd 0 has already been redirected at least once. */
6351 fd0_redirected_p () {
6352 return fd0_redirected != 0;
6355 static void dupredirect (const union node *, int, int fd1dup);
6359 * Turn job control on and off.
6361 * Note: This code assumes that the third arg to ioctl is a character
6362 * pointer, which is true on Berkeley systems but not System V. Since
6363 * System V doesn't have job control yet, this isn't a problem now.
6368 static void setjobctl(int enable)
6370 #ifdef OLD_TTY_DRIVER
6374 if (enable == jobctl || rootshell == 0)
6377 do { /* while we are in the background */
6378 #ifdef OLD_TTY_DRIVER
6379 if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) {
6381 initialpgrp = tcgetpgrp(2);
6382 if (initialpgrp < 0) {
6384 out2str("sh: can't access tty; job control turned off\n");
6388 if (initialpgrp == -1)
6389 initialpgrp = getpgrp();
6390 else if (initialpgrp != getpgrp()) {
6391 killpg(initialpgrp, SIGTTIN);
6395 #ifdef OLD_TTY_DRIVER
6396 if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) {
6397 out2str("sh: need new tty driver to run job control; job control turned off\n");
6405 setpgid(0, rootpid);
6406 #ifdef OLD_TTY_DRIVER
6407 ioctl(2, TIOCSPGRP, (char *)&rootpid);
6409 tcsetpgrp(2, rootpid);
6411 } else { /* turning job control off */
6412 setpgid(0, initialpgrp);
6413 #ifdef OLD_TTY_DRIVER
6414 ioctl(2, TIOCSPGRP, (char *)&initialpgrp);
6416 tcsetpgrp(2, initialpgrp);
6442 "Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n"
6443 "kill -l [exitstatus]"
6447 if (*argv[1] == '-') {
6448 signo = decode_signal(argv[1] + 1, 1);
6452 while ((c = nextopt("ls:")) != '\0')
6458 signo = decode_signal(optionarg, 1);
6461 "invalid signal number or name: %s",
6469 "nextopt returned character code 0%o", c);
6476 if (!list && signo < 0)
6479 if ((signo < 0 || !*argptr) ^ list) {
6488 for (i = 1; i < NSIG; i++) {
6489 name = u_signal_names(0, &i, 1);
6491 printf(snlfmt, name);
6495 name = u_signal_names(*argptr, &signo, -1);
6497 printf(snlfmt, name);
6499 error("invalid signal number or exit status: %s",
6505 if (**argptr == '%') {
6506 jp = getjob(*argptr);
6507 if (jp->jobctl == 0)
6508 error("job %s not created under job control",
6510 pid = -jp->ps[0].pid;
6512 pid = atoi(*argptr);
6513 if (kill(pid, signo) != 0)
6514 error("%s: %m", *argptr);
6515 } while (*++argptr);
6529 jp = getjob(argv[1]);
6530 if (jp->jobctl == 0)
6531 error("job not created under job control");
6532 pgrp = jp->ps[0].pid;
6533 #ifdef OLD_TTY_DRIVER
6534 ioctl(2, TIOCSPGRP, (char *)&pgrp);
6540 status = waitforjob(jp);
6554 jp = getjob(*++argv);
6555 if (jp->jobctl == 0)
6556 error("job not created under job control");
6558 } while (--argc > 1);
6567 struct procstat *ps;
6570 if (jp->state == JOBDONE)
6573 killpg(jp->ps[0].pid, SIGCONT);
6574 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
6575 if (WIFSTOPPED(ps->status)) {
6584 static void showjobs(int change);
6598 * Print a list of jobs. If "change" is nonzero, only print jobs whose
6599 * statuses have changed since the last call to showjobs.
6601 * If the shell is interrupted in the process of creating a job, the
6602 * result may be a job structure containing zero processes. Such structures
6603 * will be freed here.
6614 struct procstat *ps;
6618 TRACE(("showjobs(%d) called\n", change));
6619 while (dowait(0, (struct job *)NULL) > 0);
6620 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
6623 if (jp->nprocs == 0) {
6627 if (change && ! jp->changed)
6629 procno = jp->nprocs;
6630 for (ps = jp->ps ; ; ps++) { /* for each process */
6632 snprintf(s, 64, "[%d] %ld ", jobno,
6635 snprintf(s, 64, " %ld ",
6640 if (ps->status == -1) {
6641 /* don't print anything */
6642 } else if (WIFEXITED(ps->status)) {
6643 snprintf(s, 64, "Exit %d",
6644 WEXITSTATUS(ps->status));
6647 if (WIFSTOPPED(ps->status))
6648 i = WSTOPSIG(ps->status);
6649 else /* WIFSIGNALED(ps->status) */
6651 i = WTERMSIG(ps->status);
6652 if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F])
6653 strcpy(s, sys_siglist[i & 0x7F]);
6655 snprintf(s, 64, "Signal %d", i & 0x7F);
6656 if (WCOREDUMP(ps->status))
6657 strcat(s, " (core dumped)");
6662 "%*c%s\n", 30 - col >= 0 ? 30 - col : 0, ' ',
6669 if (jp->state == JOBDONE) {
6677 * Mark a job structure as unused.
6681 freejob(struct job *jp)
6683 const struct procstat *ps;
6687 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
6688 if (ps->cmd != nullstr)
6691 if (jp->ps != &jp->ps0)
6695 if (curjob == jp - jobtab + 1)
6714 job = getjob(*++argv);
6718 for (;;) { /* loop until process terminated or stopped */
6721 status = job->ps[job->nprocs - 1].status;
6727 if (WIFEXITED(status))
6728 retval = WEXITSTATUS(status);
6730 else if (WIFSTOPPED(status))
6731 retval = WSTOPSIG(status) + 128;
6734 /* XXX: limits number of signals */
6735 retval = WTERMSIG(status) + 128;
6740 for (jp = jobtab ; ; jp++) {
6741 if (jp >= jobtab + njobs) { /* no running procs */
6744 if (jp->used && jp->state == 0)
6748 if (dowait(2, 0) < 0 && errno == EINTR) {
6757 * Convert a job name to a job structure.
6761 getjob(const char *name)
6771 if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0)
6772 error("No current job");
6773 return &jobtab[jobno - 1];
6775 error("No current job");
6777 } else if (name[0] == '%') {
6778 if (is_digit(name[1])) {
6779 jobno = number(name + 1);
6780 if (jobno > 0 && jobno <= njobs
6781 && jobtab[jobno - 1].used != 0)
6782 return &jobtab[jobno - 1];
6784 } else if (name[1] == '%' && name[2] == '\0') {
6788 struct job *found = NULL;
6789 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
6790 if (jp->used && jp->nprocs > 0
6791 && prefix(name + 1, jp->ps[0].cmd)) {
6793 error("%s: ambiguous", name);
6800 } else if (is_number(name, &pid)) {
6801 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
6802 if (jp->used && jp->nprocs > 0
6803 && jp->ps[jp->nprocs - 1].pid == pid)
6807 error("No such job: %s", name);
6814 * Return a new job structure,
6818 makejob(const union node *node, int nprocs)
6823 for (i = njobs, jp = jobtab ; ; jp++) {
6827 jobtab = ckmalloc(4 * sizeof jobtab[0]);
6829 jp = ckmalloc((njobs + 4) * sizeof jobtab[0]);
6830 memcpy(jp, jobtab, njobs * sizeof jp[0]);
6831 /* Relocate `ps' pointers */
6832 for (i = 0; i < njobs; i++)
6833 if (jp[i].ps == &jobtab[i].ps0)
6834 jp[i].ps = &jp[i].ps0;
6838 jp = jobtab + njobs;
6839 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
6852 jp->jobctl = jobctl;
6855 jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
6860 TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
6867 * Fork of a subshell. If we are doing job control, give the subshell its
6868 * own process group. Jp is a job structure that the job is to be added to.
6869 * N is the command that will be evaluated by the child. Both jp and n may
6870 * be NULL. The mode parameter can be one of the following:
6871 * FORK_FG - Fork off a foreground process.
6872 * FORK_BG - Fork off a background process.
6873 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
6874 * process group even if job control is on.
6876 * When job control is turned off, background processes have their standard
6877 * input redirected to /dev/null (except for the second and later processes
6884 forkshell(struct job *jp, const union node *n, int mode)
6890 const char *devnull = _PATH_DEVNULL;
6891 const char *nullerr = "Can't open %s";
6893 TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n,
6898 TRACE(("Fork failed, errno=%d\n", errno));
6900 error("Cannot fork");
6907 TRACE(("Child shell %d\n", getpid()));
6908 wasroot = rootshell;
6914 jobctl = 0; /* do job control only in root shell */
6915 if (wasroot && mode != FORK_NOJOB && mflag) {
6916 if (jp == NULL || jp->nprocs == 0)
6919 pgrp = jp->ps[0].pid;
6921 if (mode == FORK_FG) {
6922 /*** this causes superfluous TIOCSPGRPS ***/
6923 #ifdef OLD_TTY_DRIVER
6924 if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0)
6925 error("TIOCSPGRP failed, errno=%d", errno);
6927 if (tcsetpgrp(2, pgrp) < 0)
6928 error("tcsetpgrp failed, errno=%d", errno);
6933 } else if (mode == FORK_BG) {
6936 if ((jp == NULL || jp->nprocs == 0) &&
6937 ! fd0_redirected_p ()) {
6939 if (open(devnull, O_RDONLY) != 0)
6940 error(nullerr, devnull);
6944 if (mode == FORK_BG) {
6947 if ((jp == NULL || jp->nprocs == 0) &&
6948 ! fd0_redirected_p ()) {
6950 if (open(devnull, O_RDONLY) != 0)
6951 error(nullerr, devnull);
6955 for (i = njobs, p = jobtab ; --i >= 0 ; p++)
6958 if (wasroot && iflag) {
6966 if (rootshell && mode != FORK_NOJOB && mflag) {
6967 if (jp == NULL || jp->nprocs == 0)
6970 pgrp = jp->ps[0].pid;
6974 if (mode == FORK_BG)
6975 backgndpid = pid; /* set $! */
6977 struct procstat *ps = &jp->ps[jp->nprocs++];
6981 if (iflag && rootshell && n)
6982 ps->cmd = commandtext(n);
6985 TRACE(("In parent shell: child = %d\n", pid));
6992 * Wait for job to finish.
6994 * Under job control we have the problem that while a child process is
6995 * running interrupts generated by the user are sent to the child but not
6996 * to the shell. This means that an infinite loop started by an inter-
6997 * active user may be hard to kill. With job control turned off, an
6998 * interactive user may place an interactive program inside a loop. If
6999 * the interactive program catches interrupts, the user doesn't want
7000 * these interrupts to also abort the loop. The approach we take here
7001 * is to have the shell ignore interrupt signals while waiting for a
7002 * forground process to terminate, and then send itself an interrupt
7003 * signal if the child process was terminated by an interrupt signal.
7004 * Unfortunately, some programs want to do a bit of cleanup and then
7005 * exit on interrupt; unless these processes terminate themselves by
7006 * sending a signal to themselves (instead of calling exit) they will
7007 * confuse this approach.
7011 waitforjob(struct job *jp)
7014 int mypgrp = getpgrp();
7018 struct sigaction act, oact;
7027 sigaction(SIGINT, 0, &act);
7028 act.sa_handler = waitonint;
7029 sigaction(SIGINT, &act, &oact);
7031 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
7032 while (jp->state == 0) {
7040 sigaction(SIGINT, &oact, 0);
7041 if (intreceived && trap[SIGINT]) kill(getpid(), SIGINT);
7045 #ifdef OLD_TTY_DRIVER
7046 if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0)
7047 error("TIOCSPGRP failed, errno=%d\n", errno);
7049 if (tcsetpgrp(2, mypgrp) < 0)
7050 error("tcsetpgrp failed, errno=%d\n", errno);
7053 if (jp->state == JOBSTOPPED)
7054 curjob = jp - jobtab + 1;
7056 status = jp->ps[jp->nprocs - 1].status;
7057 /* convert to 8 bits */
7058 if (WIFEXITED(status))
7059 st = WEXITSTATUS(status);
7061 else if (WIFSTOPPED(status))
7062 st = WSTOPSIG(status) + 128;
7065 st = WTERMSIG(status) + 128;
7069 * This is truly gross.
7070 * If we're doing job control, then we did a TIOCSPGRP which
7071 * caused us (the shell) to no longer be in the controlling
7072 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
7073 * intuit from the subprocess exit status whether a SIGINT
7074 * occured, and if so interrupt ourselves. Yuck. - mycroft
7076 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
7079 if (jp->state == JOBDONE)
7090 * Wait for a process to terminate.
7094 * Do a wait system call. If job control is compiled in, we accept
7095 * stopped processes. If block is zero, we return a value of zero
7096 * rather than blocking.
7098 * System V doesn't have a non-blocking wait system call. It does
7099 * have a SIGCLD signal that is sent to a process when one of it's
7100 * children dies. The obvious way to use SIGCLD would be to install
7101 * a handler for SIGCLD which simply bumped a counter when a SIGCLD
7102 * was received, and have waitproc bump another counter when it got
7103 * the status of a process. Waitproc would then know that a wait
7104 * system call would not block if the two counters were different.
7105 * This approach doesn't work because if a process has children that
7106 * have not been waited for, System V will send it a SIGCLD when it
7107 * installs a signal handler for SIGCLD. What this means is that when
7108 * a child exits, the shell will be sent SIGCLD signals continuously
7109 * until is runs out of stack space, unless it does a wait call before
7110 * restoring the signal handler. The code below takes advantage of
7111 * this (mis)feature by installing a signal handler for SIGCLD and
7112 * then checking to see whether it was called. If there are any
7113 * children to be waited for, it will be.
7118 waitproc(int block, int *status)
7129 return wait3(status, flags, (struct rusage *)NULL);
7133 dowait(int block, struct job *job)
7137 struct procstat *sp;
7139 struct job *thisjob;
7145 TRACE(("dowait(%d) called\n", block));
7147 pid = waitproc(block, &status);
7148 TRACE(("wait returns %d, status=%d\n", pid, status));
7149 } while (!(block & 2) && pid == -1 && errno == EINTR);
7154 for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
7158 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
7161 if (sp->pid == pid) {
7162 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status));
7163 sp->status = status;
7166 if (sp->status == -1)
7168 else if (WIFSTOPPED(sp->status))
7171 if (stopped) { /* stopped or done */
7172 int state = done? JOBDONE : JOBSTOPPED;
7173 if (jp->state != state) {
7174 TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
7177 if (done && curjob == jp - jobtab + 1)
7178 curjob = 0; /* no current job */
7185 if (! rootshell || ! iflag || (job && thisjob == job)) {
7186 core = WCOREDUMP(status);
7188 if (WIFSTOPPED(status)) sig = WSTOPSIG(status);
7191 if (WIFEXITED(status)) sig = 0;
7192 else sig = WTERMSIG(status);
7194 if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
7196 out2fmt("%d: ", pid);
7198 if (sig == SIGTSTP && rootshell && iflag)
7200 (long)(job - jobtab + 1));
7202 if (sig < NSIG && sys_siglist[sig])
7203 out2str(sys_siglist[sig]);
7205 out2fmt("Signal %d", sig);
7207 out2str(" - core dumped");
7210 TRACE(("Not printing status: status=%d, sig=%d\n",
7214 TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job));
7216 thisjob->changed = 1;
7225 * return 1 if there are stopped jobs, otherwise 0
7235 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
7238 if (jp->state == JOBSTOPPED) {
7239 out2str("You have stopped jobs.\n");
7249 * Return a string identifying a command (to be printed by the
7253 static char *cmdnextc;
7254 static int cmdnleft;
7255 #define MAXCMDTEXT 200
7258 cmdputs(const char *s)
7269 while ((c = *p++) != '\0') {
7272 else if (c == CTLVAR) {
7277 } else if (c == '=' && subtype != 0) {
7278 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
7280 } else if (c == CTLENDVAR) {
7282 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE)
7283 cmdnleft++; /* ignore it */
7286 if (--cmdnleft <= 0) {
7296 //#define CMDTXT_TABLE
7299 * To collect a lot of redundant code in cmdtxt() case statements, we
7300 * implement a mini language here. Each type of node struct has an
7301 * associated instruction sequence that operates on its members via
7302 * their offsets. The instruction are pack in unsigned chars with
7303 * format IIDDDDDE where the bits are
7304 * I : part of the instruction opcode, which are
7305 * 00 : member is a pointer to another node -- process it recursively
7306 * 40 : member is a pointer to a char string -- output it
7307 * 80 : output the string whose index is stored in the data field
7308 * CC : flag signaling that this case needs external processing
7309 * D : data - either the (shifted) index of a fixed string to output or
7310 * the actual offset of the member to operate on in the struct
7311 * (since we assume bit 0 is set, the offset is not shifted)
7312 * E : flag signaling end of instruction sequence
7314 * WARNING: In order to handle larger offsets for 64bit archs, this code
7315 * assumes that no offset can be an odd number and stores the
7316 * end-of-instructions flag in bit 0.
7319 #define CMDTXT_NOMORE 0x01 /* NOTE: no offset should be odd */
7320 #define CMDTXT_CHARPTR 0x40
7321 #define CMDTXT_STRING 0x80
7322 #define CMDTXT_SPECIAL 0xC0
7323 #define CMDTXT_OFFSETMASK 0x3E
7325 static const char * const cmdtxt_strings[] = {
7326 /* 0 1 2 3 4 5 6 7 */
7327 "; ", "(", ")", " && ", " || ", "if ", "; then ", "...",
7328 /* 8 9 10 11 12 13 */
7329 "while ", "; do ", "; done", "until ", "for ", " in ...",
7331 "case ", "???", "() ...", "<<..."
7334 static const char * const redir_strings[] = {
7335 ">", "<", "<>", ">>", ">|", ">&", "<&"
7338 static const unsigned char cmdtxt_ops[] = {
7339 #define CMDTXT_NSEMI 0
7340 offsetof(union node, nbinary.ch1),
7342 offsetof(union node, nbinary.ch2)|CMDTXT_NOMORE,
7343 #define CMDTXT_NCMD (CMDTXT_NSEMI + 3)
7344 #define CMDTXT_NPIPE (CMDTXT_NCMD)
7345 #define CMDTXT_NCASE (CMDTXT_NCMD)
7346 #define CMDTXT_NTO (CMDTXT_NCMD)
7347 #define CMDTXT_NFROM (CMDTXT_NCMD)
7348 #define CMDTXT_NFROMTO (CMDTXT_NCMD)
7349 #define CMDTXT_NAPPEND (CMDTXT_NCMD)
7350 #define CMDTXT_NTOOV (CMDTXT_NCMD)
7351 #define CMDTXT_NTOFD (CMDTXT_NCMD)
7352 #define CMDTXT_NFROMFD (CMDTXT_NCMD)
7354 #define CMDTXT_NREDIR (CMDTXT_NPIPE + 1)
7355 #define CMDTXT_NBACKGND (CMDTXT_NREDIR)
7356 offsetof(union node, nredir.n)|CMDTXT_NOMORE,
7357 #define CMDTXT_NSUBSHELL (CMDTXT_NBACKGND + 1)
7358 (1*2)|CMDTXT_STRING,
7359 offsetof(union node, nredir.n),
7360 (2*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7361 #define CMDTXT_NAND (CMDTXT_NSUBSHELL + 3)
7362 offsetof(union node, nbinary.ch1),
7363 (3*2)|CMDTXT_STRING,
7364 offsetof(union node, nbinary.ch2)|CMDTXT_NOMORE,
7365 #define CMDTXT_NOR (CMDTXT_NAND + 3)
7366 offsetof(union node, nbinary.ch1),
7367 (4*2)|CMDTXT_STRING,
7368 offsetof(union node, nbinary.ch2)|CMDTXT_NOMORE,
7369 #define CMDTXT_NIF (CMDTXT_NOR + 3)
7370 (5*2)|CMDTXT_STRING,
7371 offsetof(union node, nif.test),
7372 (6*2)|CMDTXT_STRING,
7373 offsetof(union node, nif.ifpart),
7374 (7*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7375 #define CMDTXT_NWHILE (CMDTXT_NIF + 5)
7376 (8*2)|CMDTXT_STRING,
7377 offsetof(union node, nbinary.ch1),
7378 (9*2)|CMDTXT_STRING,
7379 offsetof(union node, nbinary.ch2),
7380 (10*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7381 #define CMDTXT_NUNTIL (CMDTXT_NWHILE + 5)
7382 (11*2)|CMDTXT_STRING,
7383 offsetof(union node, nbinary.ch1),
7384 (9*2)|CMDTXT_STRING,
7385 offsetof(union node, nbinary.ch2),
7386 (10*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7387 #define CMDTXT_NFOR (CMDTXT_NUNTIL + 5)
7388 (12*2)|CMDTXT_STRING,
7389 offsetof(union node, nfor.var)|CMDTXT_CHARPTR,
7390 (13*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7391 #define CMDTXT_NCLIST (CMDTXT_NFOR + 3) /* TODO: IS THIS CORRECT??? */
7392 #define CMDTXT_NNOT (CMDTXT_NCLIST) /* TODO: IS THIS CORRECT??? */
7393 (15*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7394 #define CMDTXT_NDEFUN (CMDTXT_NCLIST + 1)
7395 offsetof(union node, narg.text)|CMDTXT_CHARPTR,
7396 (16*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7397 #define CMDTXT_NARG (CMDTXT_NDEFUN + 2)
7398 offsetof(union node, narg.text)|CMDTXT_CHARPTR|CMDTXT_NOMORE,
7399 #define CMDTXT_NHERE (CMDTXT_NARG + 1)
7400 #define CMDTXT_NXHERE (CMDTXT_NHERE)
7401 (17*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7404 #if CMDTXT_NXHERE != 36
7405 #error CMDTXT_NXHERE
7408 static const unsigned char cmdtxt_ops_index[26] = {
7438 cmdtxt(const union node *n)
7445 p = cmdtxt_ops + (int) cmdtxt_ops_index[n->type];
7446 if ((*p & CMDTXT_SPECIAL) != CMDTXT_SPECIAL) { /* normal case */
7448 if (*p & CMDTXT_STRING) { /* output fixed string */
7449 cmdputs(cmdtxt_strings[((int)(*p & CMDTXT_OFFSETMASK) >> 1)]);
7450 } else if (*p & CMDTXT_CHARPTR) { /* output dynamic string */
7451 cmdputs(((const char *) n) + ((int)(*p & CMDTXT_OFFSETMASK)));
7452 } else { /* output field */
7453 cmdtxt((const union node *)
7454 (((const char *) n) + ((int)(*p & CMDTXT_OFFSETMASK))));
7456 } while (!(*p++ & CMDTXT_NOMORE));
7457 } else if (n->type == NCMD) {
7459 for (np = n->ncmd.args ; np ; np = np->narg.next) {
7464 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
7468 } else if (n->type == NPIPE) {
7469 struct nodelist *lp;
7470 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
7475 } else if (n->type == NCASE) {
7476 cmdputs(cmdtxt_strings[14]);
7477 cmdputs(n->ncase.expr->narg.text);
7478 cmdputs(cmdtxt_strings[13]);
7480 #if (NTO != 16) || (NFROM != 17) || (NFROMTO != 18) || (NAPPEND != 19) || (NTOOV != 20) || (NTOFD != 21) || (NFROMFD != 22)
7481 #error Assumption violated regarding range and ordering of NTO ... NFROMFD!
7486 assert((n->type >= NTO) && (n->type <= NFROMFD));
7489 p = redir_strings[n->type - NTO];
7490 if (n->nfile.fd != ('>' == *p)) {
7491 s[0] = n->nfile.fd + '0';
7496 if (n->type >= NTOFD) {
7497 s[0] = n->ndup.dupfd + '0';
7501 cmdtxt(n->nfile.fname);
7505 #else /* CMDTXT_TABLE */
7507 cmdtxt(const union node *n)
7510 struct nodelist *lp;
7519 cmdtxt(n->nbinary.ch1);
7521 cmdtxt(n->nbinary.ch2);
7524 cmdtxt(n->nbinary.ch1);
7526 cmdtxt(n->nbinary.ch2);
7529 cmdtxt(n->nbinary.ch1);
7531 cmdtxt(n->nbinary.ch2);
7534 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
7542 cmdtxt(n->nredir.n);
7547 cmdtxt(n->nredir.n);
7551 cmdtxt(n->nif.test);
7553 cmdtxt(n->nif.ifpart);
7562 cmdtxt(n->nbinary.ch1);
7564 cmdtxt(n->nbinary.ch2);
7569 cmdputs(n->nfor.var);
7574 cmdputs(n->ncase.expr->narg.text);
7578 cmdputs(n->narg.text);
7582 for (np = n->ncmd.args ; np ; np = np->narg.next) {
7587 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
7593 cmdputs(n->narg.text);
7596 p = ">"; i = 1; goto redir;
7598 p = ">>"; i = 1; goto redir;
7600 p = ">&"; i = 1; goto redir;
7602 p = ">|"; i = 1; goto redir;
7604 p = "<"; i = 0; goto redir;
7606 p = "<&"; i = 0; goto redir;
7608 p = "<>"; i = 0; goto redir;
7610 if (n->nfile.fd != i) {
7611 s[0] = n->nfile.fd + '0';
7616 if (n->type == NTOFD || n->type == NFROMFD) {
7617 s[0] = n->ndup.dupfd + '0';
7621 cmdtxt(n->nfile.fname);
7636 commandtext(const union node *n)
7640 cmdnextc = name = ckmalloc(MAXCMDTEXT);
7641 cmdnleft = MAXCMDTEXT - 4;
7648 static void waitonint(int sig) {
7653 * Routines to check for mail. (Perhaps make part of main.c?)
7657 #define MAXMBOXES 10
7660 static int nmboxes; /* number of mailboxes */
7661 static time_t mailtime[MAXMBOXES]; /* times of mailboxes */
7666 * Print appropriate message(s) if mail has arrived. If the argument is
7667 * nozero, then the value of MAIL has changed, so we just update the
7678 struct stackmark smark;
7685 setstackmark(&smark);
7686 mpath = mpathset()? mpathval() : mailval();
7687 for (i = 0 ; i < nmboxes ; i++) {
7688 p = padvance(&mpath, nullstr);
7693 for (q = p ; *q ; q++);
7698 q[-1] = '\0'; /* delete trailing '/' */
7699 if (stat(p, &statb) < 0)
7701 if (statb.st_size > mailtime[i] && ! silent) {
7703 pathopt? pathopt : "you have mail");
7705 mailtime[i] = statb.st_size;
7708 popstackmark(&smark);
7714 static short profile_buf[16384];
7718 static void read_profile (const char *);
7719 static void cmdloop (int);
7720 static void options (int);
7721 static void setoption (int, int);
7722 static void procargs (int, char **);
7726 * Main routine. We initialize things, parse the arguments, execute
7727 * profiles if we're a login shell, and then call cmdloop to execute
7728 * commands. The setjmp call sets up the location to jump to when an
7729 * exception occurs. When an exception occurs the variable "state"
7730 * is used to figure out how far we had gotten.
7734 ash_main(argc, argv)
7738 struct jmploc jmploc;
7739 struct stackmark smark;
7743 BLTINCMD = find_builtin("builtin");
7744 EXECCMD = find_builtin("exec");
7745 EVALCMD = find_builtin("eval");
7747 #ifndef BB_FEATURE_SH_FANCY_PROMPT
7753 monitor(4, etext, profile_buf, sizeof profile_buf, 50);
7755 #if defined(linux) || defined(__GNU__)
7756 signal(SIGCHLD, SIG_DFL);
7759 if (setjmp(jmploc.loc)) {
7762 * When a shell procedure is executed, we raise the
7763 * exception EXSHELLPROC to clean up before executing
7764 * the shell procedure.
7766 if (exception == EXSHELLPROC) {
7772 if (exception == EXEXEC) {
7773 exitstatus = exerrno;
7774 } else if (exception == EXERROR) {
7777 if (state == 0 || iflag == 0 || ! rootshell)
7778 exitshell(exitstatus);
7781 if (exception == EXINT) {
7784 popstackmark(&smark);
7785 FORCEINTON; /* enable interrupts */
7788 else if (state == 2)
7790 else if (state == 3)
7798 trputs("Shell args: "); trargs(argv);
7803 setstackmark(&smark);
7804 procargs(argc, argv);
7805 if (argv[0] && argv[0][0] == '-') {
7807 read_profile("/etc/profile");
7810 read_profile(".profile");
7815 if (getuid() == geteuid() && getgid() == getegid()) {
7817 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
7819 read_profile(shinit);
7826 if (sflag == 0 || minusc) {
7827 static const char sigs[] = {
7828 SIGINT, SIGQUIT, SIGHUP,
7834 #define SIGSSIZE ((sizeof(sigs)/sizeof(sigs[0])) - 1) /* trailing nul */
7837 for (i = 0; i < SIGSSIZE; i++)
7842 evalstring(minusc, 0);
7844 if (sflag || minusc == NULL) {
7845 state4: /* XXX ??? - why isn't this before the "if" statement */
7851 exitshell(exitstatus);
7857 * Read and execute commands. "Top" is nonzero for the top level command
7858 * loop; it turns on prompting if the shell is interactive.
7865 struct stackmark smark;
7869 TRACE(("cmdloop(%d) called\n", top));
7870 setstackmark(&smark);
7881 n = parsecmd(inter);
7882 /* showtree(n); DEBUG */
7884 if (!top || numeof >= 50)
7886 if (!stoppedjobs()) {
7889 out2str("\nUse \"exit\" to leave shell.\n");
7892 } else if (n != NULL && nflag == 0) {
7893 job_warning = (job_warning == 2) ? 1 : 0;
7897 popstackmark(&smark);
7898 setstackmark(&smark);
7899 if (evalskip == SKIPFILE) {
7904 popstackmark(&smark);
7910 * Read /etc/profile or .profile. Return on error.
7922 if ((fd = open(name, O_RDONLY)) >= 0)
7927 /* -q turns off -x and -v just when executing init files */
7928 /* Note: Might do a little redundant work, but reduces code size. */
7943 * Read a file containing shell functions.
7947 readcmdfile(const char *name)
7952 if ((fd = open(name, O_RDONLY)) >= 0)
7955 error("Can't open %s", name);
7964 * Take commands from a file. To be compatable we should do a path
7965 * search for the file, which is necessary to find sub-commands.
7969 static inline char *
7970 find_dot_file(mybasename)
7974 const char *path = pathval();
7977 /* don't try this for absolute or relative paths */
7978 if (strchr(mybasename, '/'))
7981 while ((fullname = padvance(&path, mybasename)) != NULL) {
7982 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
7984 * Don't bother freeing here, since it will
7985 * be freed by the caller.
7989 stunalloc(fullname);
7992 /* not found in the PATH */
7993 error("%s: not found", mybasename);
8005 for (sp = cmdenviron; sp ; sp = sp->next)
8006 setvareq(savestr(sp->text), VSTRFIXED|VTEXTFIXED);
8008 if (argc >= 2) { /* That's what SVR2 does */
8010 struct stackmark smark;
8012 setstackmark(&smark);
8013 fullname = find_dot_file(argv[1]);
8014 setinputfile(fullname, 1);
8015 commandname = fullname;
8018 popstackmark(&smark);
8032 exitstatus = number(argv[1]);
8034 exitstatus = oexitstatus;
8035 exitshell(exitstatus);
8044 nbytes = ALIGN(nbytes);
8045 if (nbytes > stacknleft) {
8047 struct stack_block *sp;
8050 if (blocksize < MINSIZE)
8051 blocksize = MINSIZE;
8053 sp = ckmalloc(sizeof(struct stack_block) - MINSIZE + blocksize);
8055 stacknxt = sp->space;
8056 stacknleft = blocksize;
8062 stacknleft -= nbytes;
8068 stunalloc(pointer p)
8071 if (p == NULL) { /*DEBUG */
8072 write(2, "stunalloc\n", 10);
8076 if (!(stacknxt >= (char *)p && (char *)p >= stackp->space)) {
8079 stacknleft += stacknxt - (char *)p;
8085 setstackmark(struct stackmark *mark)
8087 mark->stackp = stackp;
8088 mark->stacknxt = stacknxt;
8089 mark->stacknleft = stacknleft;
8090 mark->marknext = markp;
8096 popstackmark(struct stackmark *mark)
8098 struct stack_block *sp;
8101 markp = mark->marknext;
8102 while (stackp != mark->stackp) {
8107 stacknxt = mark->stacknxt;
8108 stacknleft = mark->stacknleft;
8114 * When the parser reads in a string, it wants to stick the string on the
8115 * stack and only adjust the stack pointer when it knows how big the
8116 * string is. Stackblock (defined in stack.h) returns a pointer to a block
8117 * of space on top of the stack and stackblocklen returns the length of
8118 * this block. Growstackblock will grow this space by at least one byte,
8119 * possibly moving it (like realloc). Grabstackblock actually allocates the
8120 * part of the block that has been used.
8124 growstackblock(void) {
8126 int newlen = ALIGN(stacknleft * 2 + 100);
8127 char *oldspace = stacknxt;
8128 int oldlen = stacknleft;
8129 struct stack_block *sp;
8130 struct stack_block *oldstackp;
8132 if (stacknxt == stackp->space && stackp != &stackbase) {
8137 sp = ckrealloc((pointer)sp, sizeof(struct stack_block) - MINSIZE + newlen);
8140 stacknxt = sp->space;
8141 stacknleft = newlen;
8143 /* Stack marks pointing to the start of the old block
8144 * must be relocated to point to the new block
8146 struct stackmark *xmark;
8148 while (xmark != NULL && xmark->stackp == oldstackp) {
8149 xmark->stackp = stackp;
8150 xmark->stacknxt = stacknxt;
8151 xmark->stacknleft = stacknleft;
8152 xmark = xmark->marknext;
8157 p = stalloc(newlen);
8158 memcpy(p, oldspace, oldlen);
8159 stacknxt = p; /* free the space */
8160 stacknleft += newlen; /* we just allocated */
8167 grabstackblock(int len)
8177 * The following routines are somewhat easier to use that the above.
8178 * The user declares a variable of type STACKSTR, which may be declared
8179 * to be a register. The macro STARTSTACKSTR initializes things. Then
8180 * the user uses the macro STPUTC to add characters to the string. In
8181 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
8182 * grown as necessary. When the user is done, she can just leave the
8183 * string there and refer to it using stackblock(). Or she can allocate
8184 * the space for it using grabstackstr(). If it is necessary to allow
8185 * someone else to use the stack temporarily and then continue to grow
8186 * the string, the user should use grabstack to allocate the space, and
8187 * then call ungrabstr(p) to return to the previous mode of operation.
8189 * USTPUTC is like STPUTC except that it doesn't check for overflow.
8190 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
8191 * is space for at least one character.
8196 growstackstr(void) {
8197 int len = stackblocksize();
8198 if (herefd >= 0 && len >= 1024) {
8199 xwrite(herefd, stackblock(), len);
8200 sstrnleft = len - 1;
8201 return stackblock();
8204 sstrnleft = stackblocksize() - len - 1;
8205 return stackblock() + len;
8210 * Called from CHECKSTRSPACE.
8214 makestrspace(size_t newlen) {
8215 int len = stackblocksize() - sstrnleft;
8218 sstrnleft = stackblocksize() - len;
8219 } while (sstrnleft < newlen);
8220 return stackblock() + len;
8226 ungrabstackstr(char *s, char *p)
8228 stacknleft += stacknxt - s;
8230 sstrnleft = stacknleft - (p - s);
8233 * Miscelaneous builtins.
8239 #if !defined(__GLIBC__) || __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
8240 typedef long rlim_t;
8246 * The read builtin. The -e option causes backslashes to escape the
8247 * following character.
8249 * This uses unbuffered input, which may be avoidable in some cases.
8253 readcmd(int argc, char **argv)
8268 while ((i = nextopt("p:r")) != '\0') {
8274 if (prompt && isatty(0)) {
8275 out2str(prompt); /* read without cmdedit */
8278 if (*(ap = argptr) == NULL)
8280 if ((ifs = bltinlookup("IFS")) == NULL)
8287 if (read(0, &c, 1) != 1) {
8299 if (!rflag && c == '\\') {
8305 if (startword && *ifs == ' ' && strchr(ifs, c)) {
8309 if (backslash && c == '\\') {
8310 if (read(0, &c, 1) != 1) {
8315 } else if (ap[1] != NULL && strchr(ifs, c) != NULL) {
8317 setvar(*ap, stackblock(), 0);
8326 /* Remove trailing blanks */
8327 while (stackblock() <= --p && strchr(ifs, *p) != NULL)
8329 setvar(*ap, stackblock(), 0);
8330 while (*++ap != NULL)
8331 setvar(*ap, nullstr, 0);
8338 umaskcmd(argc, argv)
8342 static const char permuser[3] = "ugo";
8343 static const char permmode[3] = "rwx";
8344 static const short int permmask[] = {
8345 S_IRUSR, S_IWUSR, S_IXUSR,
8346 S_IRGRP, S_IWGRP, S_IXGRP,
8347 S_IROTH, S_IWOTH, S_IXOTH
8353 int symbolic_mode = 0;
8355 while (nextopt("S") != '\0') {
8364 if ((ap = *argptr) == NULL) {
8365 if (symbolic_mode) {
8368 for (i=0 ; i<3 ; i++) {
8372 for (j=0 ; j<3 ; j++) {
8373 if ((mask & permmask[3*i+j]) == 0) {
8382 printf("%.4o\n", mask);
8385 if (is_digit((unsigned char)*ap)) {
8388 if (*ap >= '8' || *ap < '0')
8389 error("Illegal number: %s", argv[1]);
8390 mask = (mask << 3) + (*ap - '0');
8391 } while (*++ap != '\0');
8394 mask = ~mask & 0777;
8395 if (parse_mode(ap, &mask) == FALSE) {
8396 error("Illegal mode: %s", ap);
8398 umask(~mask & 0777);
8407 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
8408 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
8409 * ash by J.T. Conklin.
8417 short factor; /* multiply by to get rlim_{cur,max} values */
8420 static const struct limits limits[] = {
8422 { "time(seconds)", RLIMIT_CPU, 1 },
8425 { "file(blocks)", RLIMIT_FSIZE, 512 },
8428 { "data(kbytes)", RLIMIT_DATA, 1024 },
8431 { "stack(kbytes)", RLIMIT_STACK, 1024 },
8434 { "coredump(blocks)", RLIMIT_CORE, 512 },
8437 { "memory(kbytes)", RLIMIT_RSS, 1024 },
8439 #ifdef RLIMIT_MEMLOCK
8440 { "locked memory(kbytes)", RLIMIT_MEMLOCK, 1024 },
8443 { "process(processes)", RLIMIT_NPROC, 1 },
8445 #ifdef RLIMIT_NOFILE
8446 { "nofiles(descriptors)", RLIMIT_NOFILE, 1 },
8449 { "vmemory(kbytes)", RLIMIT_VMEM, 1024 },
8452 { "swap(kbytes)", RLIMIT_SWAP, 1024 },
8458 ulimitcmd(argc, argv)
8462 static const char unlimited_string[] = "unlimited";
8465 enum { SOFT = 0x1, HARD = 0x2 }
8467 const struct limits *l;
8470 struct rlimit limit;
8474 while ((optc = nextopt("HSa"
8493 #ifdef RLIMIT_MEMLOCK
8499 #ifdef RLIMIT_NOFILE
8511 } else if (optc == 'S') {
8513 } else if (optc == 'a') {
8520 for (l = limits; l->name; l++) {
8521 if(l->name[0] == what)
8523 if(l->name[1]=='w' && what=='w')
8527 set = *argptr ? 1 : 0;
8531 if (all || argptr[1])
8532 error("too many arguments");
8533 if (strcmp(p, unlimited_string) == 0)
8534 val = RLIM_INFINITY;
8538 while ((c = *p++) >= '0' && c <= '9')
8540 val = (val * 10) + (long)(c - '0');
8541 if (val < (rlim_t) 0)
8545 error("bad number");
8551 for (l = limits; l->name; l++) {
8552 printf("%-20s ", l->name);
8553 getrlimit(l->cmd, &limit);
8556 val = limit.rlim_cur;
8557 else if (how & HARD)
8558 val = limit.rlim_max;
8560 if (val == RLIM_INFINITY)
8561 puts(unlimited_string);
8565 printf("%lld\n", (long long) val);
8578 getrlimit(l->cmd, &limit);
8580 limit.rlim_max = val;
8582 limit.rlim_cur = val;
8583 if (setrlimit(l->cmd, &limit) < 0)
8584 error("error setting limit (%m)");
8588 * prefix -- see if pfx is a prefix of string.
8592 prefix(char const *pfx, char const *string)
8595 if (*pfx++ != *string++)
8602 * Return true if s is a string of digits, and save munber in intptr
8607 is_number(const char *p, int *intptr)
8615 ret += digit_val(*p);
8617 } while (*p != '\0');
8624 * Convert a string of digits to an integer, printing an error message on
8629 number(const char *s)
8632 if (! is_number(s, &i))
8633 error("Illegal number: %s", s);
8638 * Produce a possibly single quoted string suitable as input to the shell.
8639 * The return string is allocated on the stack.
8643 single_quote(const char *s) {
8650 size_t len1, len1p, len2, len2p;
8652 len1 = strcspn(s, "'");
8653 len2 = strspn(s + len1, "'");
8655 len1p = len1 ? len1 + 2 : len1;
8656 len2p = len2 + ((len2 < 2) ? len2 : 2);
8658 CHECKSTRSPACE(len1p + len2p + 1, p);
8663 memcpy(p + 1, s, len1);
8671 memcpy(q + 1, s, len2);
8674 } else if (len2 == 1) {
8680 STADJUST(len1p + len2p, p);
8685 return grabstackstr(p);
8689 * Like strdup but works with the ash stack.
8693 sstrdup(const char *p)
8695 size_t len = strlen(p) + 1;
8696 return memcpy(stalloc(len), p, len);
8701 * Routine for dealing with parsed shell commands.
8705 static void sizenodelist (const struct nodelist *);
8706 static struct nodelist *copynodelist (const struct nodelist *);
8707 static char *nodesavestr (const char *);
8709 //#define CALCSIZE_TABLE
8710 //#define COPYNODE_TABLE
8711 #if defined(CALCSIZE_TABLE) || defined(COPYNODE_TABLE)
8713 * To collect a lot of redundant code in case statements for copynode()
8714 * and calcsize(), we implement a mini language here. Each type of node
8715 * struct has an associated instruction sequence that operates on its
8716 * members via their offsets. The instruction are pack in unsigned chars
8717 * with format IIDDDDDE where the bits are
8718 * I : part of the instruction opcode, which are
8719 * 00 : member is a pointer to another node
8720 * 40 : member is an integer
8721 * 80 : member is a pointer to a nodelist
8722 * CC : member is a pointer to a char string
8723 * D : data - the actual offset of the member to operate on in the struct
8724 * (since we assume bit 0 is set, it is not shifted)
8725 * E : flag signaling end of instruction sequence
8727 * WARNING: In order to handle larger offsets for 64bit archs, this code
8728 * assumes that no offset can be an odd number and stores the
8729 * end-of-instructions flag in bit 0.
8732 #define NODE_INTEGER 0x40
8733 #define NODE_NODELIST 0x80
8734 #define NODE_CHARPTR 0xC0
8735 #define NODE_NOMORE 0x01 /* Note: no offset should be odd (aligned)*/
8736 #define NODE_MBRMASK 0xC0
8737 #define NODE_OFFSETMASK 0x3E
8739 static const unsigned char copynode_ops[35] = {
8740 #define COPYNODE_OPS0 0
8741 offsetof(union node, nbinary.ch2),
8742 offsetof(union node, nbinary.ch1)|NODE_NOMORE,
8743 #define COPYNODE_OPS1 (COPYNODE_OPS0 + 2)
8744 offsetof(union node, ncmd.redirect),
8745 offsetof(union node, ncmd.args),
8746 offsetof(union node, ncmd.assign),
8747 offsetof(union node, ncmd.backgnd)|NODE_INTEGER|NODE_NOMORE,
8748 #define COPYNODE_OPS2 (COPYNODE_OPS1 + 4)
8749 offsetof(union node, npipe.cmdlist)|NODE_NODELIST,
8750 offsetof(union node, npipe.backgnd)|NODE_INTEGER|NODE_NOMORE,
8751 #define COPYNODE_OPS3 (COPYNODE_OPS2 + 2)
8752 offsetof(union node, nredir.redirect),
8753 offsetof(union node, nredir.n)|NODE_NOMORE,
8754 #define COPYNODE_OPS4 (COPYNODE_OPS3 + 2)
8755 offsetof(union node, nif.elsepart),
8756 offsetof(union node, nif.ifpart),
8757 offsetof(union node, nif.test)|NODE_NOMORE,
8758 #define COPYNODE_OPS5 (COPYNODE_OPS4 + 3)
8759 offsetof(union node, nfor.var)|NODE_CHARPTR,
8760 offsetof(union node, nfor.body),
8761 offsetof(union node, nfor.args)|NODE_NOMORE,
8762 #define COPYNODE_OPS6 (COPYNODE_OPS5 + 3)
8763 offsetof(union node, ncase.cases),
8764 offsetof(union node, ncase.expr)|NODE_NOMORE,
8765 #define COPYNODE_OPS7 (COPYNODE_OPS6 + 2)
8766 offsetof(union node, nclist.body),
8767 offsetof(union node, nclist.pattern),
8768 offsetof(union node, nclist.next)|NODE_NOMORE,
8769 #define COPYNODE_OPS8 (COPYNODE_OPS7 + 3)
8770 offsetof(union node, narg.backquote)|NODE_NODELIST,
8771 offsetof(union node, narg.text)|NODE_CHARPTR,
8772 offsetof(union node, narg.next)|NODE_NOMORE,
8773 #define COPYNODE_OPS9 (COPYNODE_OPS8 + 3)
8774 offsetof(union node, nfile.fname),
8775 offsetof(union node, nfile.fd)|NODE_INTEGER,
8776 offsetof(union node, nfile.next)|NODE_NOMORE,
8777 #define COPYNODE_OPS10 (COPYNODE_OPS9 + 3)
8778 offsetof(union node, ndup.vname),
8779 offsetof(union node, ndup.dupfd)|NODE_INTEGER,
8780 offsetof(union node, ndup.fd)|NODE_INTEGER,
8781 offsetof(union node, ndup.next)|NODE_NOMORE,
8782 #define COPYNODE_OPS11 (COPYNODE_OPS10 + 4)
8783 offsetof(union node, nhere.doc),
8784 offsetof(union node, nhere.fd)|NODE_INTEGER,
8785 offsetof(union node, nhere.next)|NODE_NOMORE,
8786 #define COPYNODE_OPS12 (COPYNODE_OPS11 + 3)
8787 offsetof(union node, nnot.com)|NODE_NOMORE,
8790 #if COPYNODE_OPS12 != 34
8791 #error COPYNODE_OPS12 is incorrect
8794 static const unsigned char copynode_ops_index[26] = {
8795 COPYNODE_OPS0, /* NSEMI */
8796 COPYNODE_OPS1, /* NCMD */
8797 COPYNODE_OPS2, /* NPIPE */
8798 COPYNODE_OPS3, /* NREDIR */
8799 COPYNODE_OPS3, /* NBACKGND */
8800 COPYNODE_OPS3, /* NSUBSHELL */
8801 COPYNODE_OPS0, /* NAND */
8802 COPYNODE_OPS0, /* NOR */
8803 COPYNODE_OPS4, /* NIF */
8804 COPYNODE_OPS0, /* NWHILE */
8805 COPYNODE_OPS0, /* NUNTIL */
8806 COPYNODE_OPS5, /* NFOR */
8807 COPYNODE_OPS6, /* NCASE */
8808 COPYNODE_OPS7, /* NCLIST */
8809 COPYNODE_OPS8, /* NDEFUN */
8810 COPYNODE_OPS8, /* NARG */
8811 COPYNODE_OPS9, /* NTO */
8812 COPYNODE_OPS9, /* NFROM */
8813 COPYNODE_OPS9, /* NFROMTO */
8814 COPYNODE_OPS9, /* NAPPEND */
8815 COPYNODE_OPS9, /* NTOOV */
8816 COPYNODE_OPS10, /* NTOFD */
8817 COPYNODE_OPS10, /* NFROMFD */
8818 COPYNODE_OPS11, /* NHERE */
8819 COPYNODE_OPS11, /* NXHERE */
8820 COPYNODE_OPS12, /* NNOT */
8823 #if NODE_CHARPTR != NODE_MBRMASK
8824 #error NODE_CHARPTR != NODE_MBRMASK!!!
8826 #endif /* defined(CALCSIZE_TABLE) || defined(COPYNODE_TABLE) */
8828 #ifdef COPYNODE_TABLE
8830 copynode(const union node *n)
8833 const unsigned char *p;
8838 new->type = n->type;
8839 funcblock = (char *) funcblock + (int) nodesize[n->type];
8840 p = copynode_ops + (int) copynode_ops_index[n->type];
8842 char *nn = ((char *) new) + ((int)(*p & NODE_OFFSETMASK));
8843 const char *no = ((const char *) n) + ((int)(*p & NODE_OFFSETMASK));
8845 if (!(*p & NODE_MBRMASK)) { /* standard node */
8846 (union node *) nn = copynode((const union node *) no);
8847 } else if ((*p & NODE_MBRMASK) == NODE_CHARPTR) { /* string */
8848 nn = nodesavestr(no);
8849 } else if (*p & NODE_NODELIST) { /* nodelist */
8850 (struct nodelist *) nn
8851 = copynodelist((const struct nodelist *) no);
8852 } else { /* integer */
8853 *((int *) nn) = *((int *) no);
8855 } while (!(*p++ & NODE_NOMORE));
8858 #else /* COPYNODE_TABLE */
8860 copynode(const union node *n)
8867 funcblock = (char *) funcblock + nodesize[n->type];
8874 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8875 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8878 new->ncmd.redirect = copynode(n->ncmd.redirect);
8879 new->ncmd.args = copynode(n->ncmd.args);
8880 new->ncmd.assign = copynode(n->ncmd.assign);
8881 new->ncmd.backgnd = n->ncmd.backgnd;
8884 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8885 new->npipe.backgnd = n->npipe.backgnd;
8890 new->nredir.redirect = copynode(n->nredir.redirect);
8891 new->nredir.n = copynode(n->nredir.n);
8894 new->nif.elsepart = copynode(n->nif.elsepart);
8895 new->nif.ifpart = copynode(n->nif.ifpart);
8896 new->nif.test = copynode(n->nif.test);
8899 new->nfor.var = nodesavestr(n->nfor.var);
8900 new->nfor.body = copynode(n->nfor.body);
8901 new->nfor.args = copynode(n->nfor.args);
8904 new->ncase.cases = copynode(n->ncase.cases);
8905 new->ncase.expr = copynode(n->ncase.expr);
8908 new->nclist.body = copynode(n->nclist.body);
8909 new->nclist.pattern = copynode(n->nclist.pattern);
8910 new->nclist.next = copynode(n->nclist.next);
8914 new->narg.backquote = copynodelist(n->narg.backquote);
8915 new->narg.text = nodesavestr(n->narg.text);
8916 new->narg.next = copynode(n->narg.next);
8923 new->nfile.fname = copynode(n->nfile.fname);
8924 new->nfile.fd = n->nfile.fd;
8925 new->nfile.next = copynode(n->nfile.next);
8929 new->ndup.vname = copynode(n->ndup.vname);
8930 new->ndup.dupfd = n->ndup.dupfd;
8931 new->ndup.fd = n->ndup.fd;
8932 new->ndup.next = copynode(n->ndup.next);
8936 new->nhere.doc = copynode(n->nhere.doc);
8937 new->nhere.fd = n->nhere.fd;
8938 new->nhere.next = copynode(n->nhere.next);
8941 new->nnot.com = copynode(n->nnot.com);
8944 new->type = n->type;
8947 #endif /* COPYNODE_TABLE */
8949 #ifdef CALCSIZE_TABLE
8951 calcsize(const union node *n)
8953 const unsigned char *p;
8957 funcblocksize += (int) nodesize[n->type];
8959 p = copynode_ops + (int) copynode_ops_index[n->type];
8961 const char *no = ((const char *) n) + ((int)(*p & NODE_OFFSETMASK));
8963 if (!(*p & NODE_MBRMASK)) { /* standard node */
8964 calcsize((const union node *) no);
8965 } else if ((*p & NODE_MBRMASK) == NODE_CHARPTR) { /* string */
8966 funcstringsize += strlen(no) + 1;
8967 } else if (*p & NODE_NODELIST) { /* nodelist */
8968 sizenodelist((const struct nodelist *) no);
8970 } while (!(*p++ & NODE_NOMORE));
8972 #else /* CALCSIZE_TABLE */
8974 calcsize(const union node *n)
8978 funcblocksize += nodesize[n->type];
8985 calcsize(n->nbinary.ch2);
8986 calcsize(n->nbinary.ch1);
8989 calcsize(n->ncmd.redirect);
8990 calcsize(n->ncmd.args);
8991 calcsize(n->ncmd.assign);
8994 sizenodelist(n->npipe.cmdlist);
8999 calcsize(n->nredir.redirect);
9000 calcsize(n->nredir.n);
9003 calcsize(n->nif.elsepart);
9004 calcsize(n->nif.ifpart);
9005 calcsize(n->nif.test);
9008 funcstringsize += strlen(n->nfor.var) + 1;
9009 calcsize(n->nfor.body);
9010 calcsize(n->nfor.args);
9013 calcsize(n->ncase.cases);
9014 calcsize(n->ncase.expr);
9017 calcsize(n->nclist.body);
9018 calcsize(n->nclist.pattern);
9019 calcsize(n->nclist.next);
9023 sizenodelist(n->narg.backquote);
9024 funcstringsize += strlen(n->narg.text) + 1;
9025 calcsize(n->narg.next);
9032 calcsize(n->nfile.fname);
9033 calcsize(n->nfile.next);
9037 calcsize(n->ndup.vname);
9038 calcsize(n->ndup.next);
9042 calcsize(n->nhere.doc);
9043 calcsize(n->nhere.next);
9046 calcsize(n->nnot.com);
9050 #endif /* CALCSIZE_TABLE */
9053 sizenodelist(const struct nodelist *lp)
9056 funcblocksize += ALIGN(sizeof(struct nodelist));
9063 static struct nodelist *
9064 copynodelist(const struct nodelist *lp)
9066 struct nodelist *start;
9067 struct nodelist **lpp;
9072 funcblock = (char *) funcblock + ALIGN(sizeof(struct nodelist));
9073 (*lpp)->n = copynode(lp->n);
9075 lpp = &(*lpp)->next;
9083 nodesavestr(const char *s)
9086 char *q = funcstring;
9087 char *rtn = funcstring;
9089 while ((*q++ = *p++) != '\0')
9096 static int getopts (char *, char *, char **, int *, int *);
9101 * Process the shell command line arguments.
9105 procargs(argc, argv)
9114 for (i = 0; i < NOPTS; i++)
9117 if (*argptr == NULL && minusc == NULL)
9119 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
9123 for (i = 0; i < NOPTS; i++)
9124 if (optent_val(i) == 2)
9127 if (sflag == 0 && minusc == NULL) {
9128 commandname = argv[0];
9130 setinputfile(arg0, 0);
9133 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
9134 if (argptr && minusc && *argptr)
9137 shellparam.p = argptr;
9138 shellparam.optind = 1;
9139 shellparam.optoff = -1;
9140 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
9142 shellparam.nparam++;
9151 * Process shell options. The global variable argptr contains a pointer
9152 * to the argument list; we advance it past the options.
9156 minus_o(const char *name, int val)
9161 out1str("Current option settings\n");
9162 for (i = 0; i < NOPTS; i++)
9163 printf("%-16s%s\n", optent_name(optlist[i]),
9164 optent_val(i) ? "on" : "off");
9166 for (i = 0; i < NOPTS; i++)
9167 if (equal(name, optent_name(optlist[i]))) {
9168 setoption(optent_letter(optlist[i]), val);
9171 error("Illegal option -o %s", name);
9177 options(int cmdline)
9185 while ((p = *argptr) != NULL) {
9187 if ((c = *p++) == '-') {
9189 if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
9191 /* "-" means turn off -x and -v */
9194 /* "--" means reset params */
9195 else if (*argptr == NULL)
9198 break; /* "-" or "--" terminates options */
9200 } else if (c == '+') {
9206 while ((c = *p++) != '\0') {
9207 if (c == 'c' && cmdline) {
9209 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
9213 if (q == NULL || minusc != NULL)
9214 error("Bad -c option");
9219 } else if (c == 'o') {
9220 minus_o(*argptr, val);
9232 setoption(int flag, int val)
9236 for (i = 0; i < NOPTS; i++)
9237 if (optent_letter(optlist[i]) == flag) {
9238 optent_val(i) = val;
9240 /* #%$ hack for ksh semantics */
9243 else if (flag == 'E')
9248 error("Illegal option -%c", flag);
9255 * Set the shell parameters.
9259 setparam(char **argv)
9265 for (nparam = 0 ; argv[nparam] ; nparam++);
9266 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
9268 *ap++ = savestr(*argv++);
9271 freeparam(&shellparam);
9272 shellparam.malloc = 1;
9273 shellparam.nparam = nparam;
9274 shellparam.p = newparam;
9275 shellparam.optind = 1;
9276 shellparam.optoff = -1;
9281 * Free the list of positional parameters.
9285 freeparam(volatile struct shparam *param)
9289 if (param->malloc) {
9290 for (ap = param->p ; *ap ; ap++)
9299 * The shift builtin command.
9303 shiftcmd(argc, argv)
9312 n = number(argv[1]);
9313 if (n > shellparam.nparam)
9314 error("can't shift that many");
9316 shellparam.nparam -= n;
9317 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
9318 if (shellparam.malloc)
9322 while ((*ap2++ = *ap1++) != NULL);
9323 shellparam.optind = 1;
9324 shellparam.optoff = -1;
9332 * The set command builtin.
9341 return showvarscmd(argc, argv);
9345 if (*argptr != NULL) {
9354 getoptsreset(const char *value)
9356 shellparam.optind = number(value);
9357 shellparam.optoff = -1;
9360 #ifdef BB_LOCALE_SUPPORT
9361 static void change_lc_all(const char *value)
9363 if(value != 0 && *value != 0)
9364 setlocale(LC_ALL, value);
9367 static void change_lc_ctype(const char *value)
9369 if(value != 0 && *value != 0)
9370 setlocale(LC_CTYPE, value);
9377 * The getopts builtin. Shellparam.optnext points to the next argument
9378 * to be processed. Shellparam.optptr points to the next character to
9379 * be processed in the current argument. If shellparam.optnext is NULL,
9380 * then it's the first time getopts has been called.
9384 getoptscmd(argc, argv)
9391 error("Usage: getopts optstring var [arg]");
9392 else if (argc == 3) {
9393 optbase = shellparam.p;
9394 if (shellparam.optind > shellparam.nparam + 1) {
9395 shellparam.optind = 1;
9396 shellparam.optoff = -1;
9401 if (shellparam.optind > argc - 2) {
9402 shellparam.optind = 1;
9403 shellparam.optoff = -1;
9407 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
9408 &shellparam.optoff);
9412 * Safe version of setvar, returns 1 on success 0 on failure.
9416 setvarsafe(name, val, flags)
9417 const char *name, *val;
9420 struct jmploc jmploc;
9421 struct jmploc *volatile savehandler = handler;
9427 if (setjmp(jmploc.loc))
9431 setvar(name, val, flags);
9433 handler = savehandler;
9438 getopts(optstr, optvar, optfirst, myoptind, optoff)
9450 char **optnext = optfirst + *myoptind - 1;
9452 if (*myoptind <= 1 || *optoff < 0 || !(*(optnext - 1)) ||
9453 strlen(*(optnext - 1)) < *optoff)
9456 p = *(optnext - 1) + *optoff;
9457 if (p == NULL || *p == '\0') {
9458 /* Current word is done, advance */
9459 if (optnext == NULL)
9462 if (p == NULL || *p != '-' || *++p == '\0') {
9464 *myoptind = optnext - optfirst + 1;
9470 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
9475 for (q = optstr; *q != c; ) {
9477 if (optstr[0] == ':') {
9480 err |= setvarsafe("OPTARG", s, 0);
9483 out2fmt("Illegal option -%c\n", c);
9484 (void) unsetvar("OPTARG");
9494 if (*p == '\0' && (p = *optnext) == NULL) {
9495 if (optstr[0] == ':') {
9498 err |= setvarsafe("OPTARG", s, 0);
9502 out2fmt("No arg for -%c option\n", c);
9503 (void) unsetvar("OPTARG");
9511 setvarsafe("OPTARG", p, 0);
9515 setvarsafe("OPTARG", "", 0);
9516 *myoptind = optnext - optfirst + 1;
9523 *optoff = p ? p - *(optnext - 1) : -1;
9524 snprintf(s, sizeof(s), "%d", *myoptind);
9525 err |= setvarsafe("OPTIND", s, VNOFUNC);
9528 err |= setvarsafe(optvar, s, 0);
9539 * XXX - should get rid of. have all builtins use getopt(3). the
9540 * library getopt must have the BSD extension static variable "optreset"
9541 * otherwise it can't be used within the shell safely.
9543 * Standard option processing (a la getopt) for builtin routines. The
9544 * only argument that is passed to nextopt is the option string; the
9545 * other arguments are unnecessary. It return the character, or '\0' on
9550 nextopt(const char *optstring)
9556 if ((p = optptr) == NULL || *p == '\0') {
9558 if (p == NULL || *p != '-' || *++p == '\0')
9561 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
9565 for (q = optstring ; *q != c ; ) {
9567 error("Illegal option -%c", c);
9572 if (*p == '\0' && (p = *argptr++) == NULL)
9573 error("No arg for -%c option", c);
9590 out2fmt(const char *fmt, ...)
9594 vfprintf(stderr, fmt, ap);
9599 * Version of write which resumes after a signal is caught.
9603 xwrite(int fd, const char *buf, int nbytes)
9612 i = write(fd, buf, n);
9618 } else if (i == 0) {
9621 } else if (errno != EINTR) {
9629 * Shell command parser.
9632 #define EOFMARKLEN 79
9637 struct heredoc *next; /* next here document in list */
9638 union node *here; /* redirection node */
9639 char *eofmark; /* string indicating end of input */
9640 int striptabs; /* if set, strip leading tabs */
9643 static struct heredoc *heredoclist; /* list of here documents to read */
9644 static int parsebackquote; /* nonzero if we are inside backquotes */
9645 static int doprompt; /* if set, prompt the user */
9646 static int needprompt; /* true if interactive and at start of line */
9647 static int lasttoken; /* last token read */
9649 static char *wordtext; /* text of last word returned by readtoken */
9651 static struct nodelist *backquotelist;
9652 static union node *redirnode;
9653 static struct heredoc *heredoc;
9654 static int quoteflag; /* set if (part of) last token was quoted */
9655 static int startlinno; /* line # where last token started */
9658 static union node *list (int);
9659 static union node *andor (void);
9660 static union node *pipeline (void);
9661 static union node *command (void);
9662 static union node *simplecmd (void);
9663 static void parsefname (void);
9664 static void parseheredoc (void);
9665 static char peektoken (void);
9666 static int readtoken (void);
9667 static int xxreadtoken (void);
9668 static int readtoken1 (int, int, const char *, int);
9669 static int noexpand (char *);
9670 static void synexpect (int) __attribute__((noreturn));
9671 static void synerror (const char *) __attribute__((noreturn));
9672 static void setprompt (int);
9676 * Read and parse a command. Returns NEOF on end of file. (NULL is a
9677 * valid parse tree indicating a blank line.)
9681 parsecmd(int interact)
9686 doprompt = interact;
9706 union node *n1, *n2, *n3;
9710 if (nlflag == 0 && peektoken())
9716 if (tok == TBACKGND) {
9717 if (n2->type == NCMD || n2->type == NPIPE) {
9718 n2->ncmd.backgnd = 1;
9719 } else if (n2->type == NREDIR) {
9720 n2->type = NBACKGND;
9722 n3 = (union node *)stalloc(sizeof (struct nredir));
9723 n3->type = NBACKGND;
9725 n3->nredir.redirect = NULL;
9733 n3 = (union node *)stalloc(sizeof (struct nbinary));
9735 n3->nbinary.ch1 = n1;
9736 n3->nbinary.ch2 = n2;
9760 pungetc(); /* push back EOF on input */
9775 union node *n1, *n2, *n3;
9781 if ((t = readtoken()) == TAND) {
9783 } else if (t == TOR) {
9791 n3 = (union node *)stalloc(sizeof (struct nbinary));
9793 n3->nbinary.ch1 = n1;
9794 n3->nbinary.ch2 = n2;
9803 union node *n1, *n2, *pipenode;
9804 struct nodelist *lp, *prev;
9808 TRACE(("pipeline: entered\n"));
9809 if (readtoken() == TNOT) {
9815 if (readtoken() == TPIPE) {
9816 pipenode = (union node *)stalloc(sizeof (struct npipe));
9817 pipenode->type = NPIPE;
9818 pipenode->npipe.backgnd = 0;
9819 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
9820 pipenode->npipe.cmdlist = lp;
9824 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
9828 } while (readtoken() == TPIPE);
9834 n2 = (union node *)stalloc(sizeof (struct nnot));
9846 union node *n1, *n2;
9847 union node *ap, **app;
9848 union node *cp, **cpp;
9849 union node *redir, **rpp;
9856 switch (readtoken()) {
9858 n1 = (union node *)stalloc(sizeof (struct nif));
9860 n1->nif.test = list(0);
9861 if (readtoken() != TTHEN)
9863 n1->nif.ifpart = list(0);
9865 while (readtoken() == TELIF) {
9866 n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
9867 n2 = n2->nif.elsepart;
9869 n2->nif.test = list(0);
9870 if (readtoken() != TTHEN)
9872 n2->nif.ifpart = list(0);
9874 if (lasttoken == TELSE)
9875 n2->nif.elsepart = list(0);
9877 n2->nif.elsepart = NULL;
9880 if (readtoken() != TFI)
9887 n1 = (union node *)stalloc(sizeof (struct nbinary));
9888 n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
9889 n1->nbinary.ch1 = list(0);
9890 if ((got=readtoken()) != TDO) {
9891 TRACE(("expecting DO got %s %s\n", tokname(got), got == TWORD ? wordtext : ""));
9894 n1->nbinary.ch2 = list(0);
9895 if (readtoken() != TDONE)
9901 if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
9902 synerror("Bad for loop variable");
9903 n1 = (union node *)stalloc(sizeof (struct nfor));
9905 n1->nfor.var = wordtext;
9907 if (readtoken() == TIN) {
9909 while (readtoken() == TWORD) {
9910 n2 = (union node *)stalloc(sizeof (struct narg));
9912 n2->narg.text = wordtext;
9913 n2->narg.backquote = backquotelist;
9915 app = &n2->narg.next;
9919 if (lasttoken != TNL && lasttoken != TSEMI)
9922 static char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE,
9924 n2 = (union node *)stalloc(sizeof (struct narg));
9926 n2->narg.text = argvars;
9927 n2->narg.backquote = NULL;
9928 n2->narg.next = NULL;
9931 * Newline or semicolon here is optional (but note
9932 * that the original Bourne shell only allowed NL).
9934 if (lasttoken != TNL && lasttoken != TSEMI)
9938 if (readtoken() != TDO)
9940 n1->nfor.body = list(0);
9941 if (readtoken() != TDONE)
9946 n1 = (union node *)stalloc(sizeof (struct ncase));
9948 if (readtoken() != TWORD)
9950 n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
9952 n2->narg.text = wordtext;
9953 n2->narg.backquote = backquotelist;
9954 n2->narg.next = NULL;
9957 } while (readtoken() == TNL);
9958 if (lasttoken != TIN)
9959 synerror("expecting \"in\"");
9960 cpp = &n1->ncase.cases;
9961 checkkwd = 2, readtoken();
9963 if (lasttoken == TLP)
9965 *cpp = cp = (union node *)stalloc(sizeof (struct nclist));
9967 app = &cp->nclist.pattern;
9969 *app = ap = (union node *)stalloc(sizeof (struct narg));
9971 ap->narg.text = wordtext;
9972 ap->narg.backquote = backquotelist;
9973 if (checkkwd = 2, readtoken() != TPIPE)
9975 app = &ap->narg.next;
9978 ap->narg.next = NULL;
9979 if (lasttoken != TRP)
9981 cp->nclist.body = list(0);
9984 if ((t = readtoken()) != TESAC) {
9986 synexpect(TENDCASE);
9988 checkkwd = 2, readtoken();
9990 cpp = &cp->nclist.next;
9991 } while(lasttoken != TESAC);
9996 n1 = (union node *)stalloc(sizeof (struct nredir));
9997 n1->type = NSUBSHELL;
9998 n1->nredir.n = list(0);
9999 n1->nredir.redirect = NULL;
10000 if (readtoken() != TRP)
10006 if (readtoken() != TEND)
10010 /* Handle an empty command like other simple commands. */
10019 * An empty command before a ; doesn't make much sense, and
10020 * should certainly be disallowed in the case of `if ;'.
10034 /* Now check for redirection which may follow command */
10035 while (readtoken() == TREDIR) {
10036 *rpp = n2 = redirnode;
10037 rpp = &n2->nfile.next;
10043 if (n1->type != NSUBSHELL) {
10044 n2 = (union node *)stalloc(sizeof (struct nredir));
10049 n1->nredir.redirect = redir;
10056 static union node *
10058 union node *args, **app;
10059 union node *n = NULL;
10060 union node *vars, **vpp;
10061 union node **rpp, *redir;
10072 switch (readtoken()) {
10075 n = (union node *)stalloc(sizeof (struct narg));
10077 n->narg.text = wordtext;
10078 n->narg.backquote = backquotelist;
10079 if (lasttoken == TWORD) {
10081 app = &n->narg.next;
10084 vpp = &n->narg.next;
10088 *rpp = n = redirnode;
10089 rpp = &n->nfile.next;
10090 parsefname(); /* read name of redirection file */
10094 args && app == &args->narg.next &&
10097 /* We have a function */
10098 if (readtoken() != TRP)
10102 n->narg.next = command();
10115 n = (union node *)stalloc(sizeof (struct ncmd));
10117 n->ncmd.backgnd = 0;
10118 n->ncmd.args = args;
10119 n->ncmd.assign = vars;
10120 n->ncmd.redirect = redir;
10124 static union node *
10128 n = (union node *)stalloc(sizeof (struct narg));
10130 n->narg.next = NULL;
10131 n->narg.text = wordtext;
10132 n->narg.backquote = backquotelist;
10136 static void fixredir(union node *n, const char *text, int err)
10138 TRACE(("Fix redir %s %d\n", text, err));
10140 n->ndup.vname = NULL;
10142 if (is_digit(text[0]) && text[1] == '\0')
10143 n->ndup.dupfd = digit_val(text[0]);
10144 else if (text[0] == '-' && text[1] == '\0')
10145 n->ndup.dupfd = -1;
10149 synerror("Bad fd number");
10151 n->ndup.vname = makename();
10158 union node *n = redirnode;
10160 if (readtoken() != TWORD)
10162 if (n->type == NHERE) {
10163 struct heredoc *here = heredoc;
10167 if (quoteflag == 0)
10169 TRACE(("Here document %d\n", n->type));
10170 if (here->striptabs) {
10171 while (*wordtext == '\t')
10174 if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
10175 synerror("Illegal eof marker for << redirection");
10176 rmescapes(wordtext);
10177 here->eofmark = wordtext;
10179 if (heredoclist == NULL)
10180 heredoclist = here;
10182 for (p = heredoclist ; p->next ; p = p->next);
10185 } else if (n->type == NTOFD || n->type == NFROMFD) {
10186 fixredir(n, wordtext, 0);
10188 n->nfile.fname = makename();
10194 * Input any here documents.
10199 struct heredoc *here;
10202 while (heredoclist) {
10203 here = heredoclist;
10204 heredoclist = here->next;
10209 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
10210 here->eofmark, here->striptabs);
10211 n = (union node *)stalloc(sizeof (struct narg));
10212 n->narg.type = NARG;
10213 n->narg.next = NULL;
10214 n->narg.text = wordtext;
10215 n->narg.backquote = backquotelist;
10216 here->here->nhere.doc = n;
10226 return tokname_array[t][0];
10234 int savecheckalias = checkalias;
10235 int savecheckkwd = checkkwd;
10240 int alreadyseen = tokpushback;
10250 checkalias = savecheckalias;
10257 if (checkkwd == 2) {
10266 * check for keywords
10268 if (t == TWORD && !quoteflag)
10270 const char *const *pp;
10272 if ((pp = findkwd(wordtext))) {
10273 lasttoken = t = pp - tokname_array;
10274 TRACE(("keyword %s recognized\n", tokname(t)));
10285 } else if (checkalias == 2 && isassignment(wordtext)) {
10286 lasttoken = t = TASSIGN;
10288 } else if (checkalias) {
10289 if (!quoteflag && (ap = lookupalias(wordtext, 1)) != NULL) {
10291 pushstring(ap->val, strlen(ap->val), ap);
10293 checkkwd = savecheckkwd;
10302 TRACE(("token %s %s\n", tokname(t), t == TWORD || t == TASSIGN ? wordtext : ""));
10304 TRACE(("reread token %s %s\n", tokname(t), t == TWORD || t == TASSIGN ? wordtext : ""));
10311 * Read the next input token.
10312 * If the token is a word, we set backquotelist to the list of cmds in
10313 * backquotes. We set quoteflag to true if any part of the word was
10315 * If the token is TREDIR, then we set redirnode to a structure containing
10317 * In all cases, the variable startlinno is set to the number of the line
10318 * on which the token starts.
10320 * [Change comment: here documents and internal procedures]
10321 * [Readtoken shouldn't have any arguments. Perhaps we should make the
10322 * word parsing code into a separate routine. In this case, readtoken
10323 * doesn't need to have any internal procedures, but parseword does.
10324 * We could also make parseoperator in essence the main routine, and
10325 * have parseword (readtoken1?) handle both words and redirection.]
10328 #define RETURN(token) return lasttoken = token
10342 startlinno = plinno;
10343 for (;;) { /* until token or start of word found */
10346 case ' ': case '\t':
10352 while ((c = pgetc()) != '\n' && c != PEOF);
10356 if (pgetc() == '\n') {
10357 startlinno = ++plinno;
10368 needprompt = doprompt;
10373 if (pgetc() == '&')
10378 if (pgetc() == '|')
10383 if (pgetc() == ';')
10396 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
10403 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10404 * is not NULL, read a here document. In the latter case, eofmark is the
10405 * word which marks the end of the document and striptabs is true if
10406 * leading tabs should be stripped from the document. The argument firstc
10407 * is the first character of the input token or document.
10409 * Because C does not have internal subroutines, I have simulated them
10410 * using goto's to implement the subroutine linkage. The following macros
10411 * will run code that appears at the end of readtoken1.
10414 #define CHECKEND() {goto checkend; checkend_return:;}
10415 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10416 #define PARSESUB() {goto parsesub; parsesub_return:;}
10417 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10418 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10419 #define PARSEARITH() {goto parsearith; parsearith_return:;}
10422 readtoken1(int firstc, int syntax, const char *eofmark, int striptabs)
10427 char line[EOFMARKLEN + 1];
10428 struct nodelist *bqlist;
10431 int varnest; /* levels of variables expansion */
10432 int arinest; /* levels of arithmetic expansion */
10433 int parenlevel; /* levels of parens in arithmetic */
10434 int dqvarnest; /* levels of variables expansion within double quotes */
10436 int prevsyntax; /* syntax before arithmetic */
10438 /* Avoid longjmp clobbering */
10444 (void) &parenlevel;
10447 (void) &prevsyntax;
10451 startlinno = plinno;
10453 if (syntax == DQSYNTAX)
10462 STARTSTACKSTR(out);
10463 loop: { /* for each line, until end of word */
10464 CHECKEND(); /* set c to PEOF if at end of here document */
10465 for (;;) { /* until end of line or end of word */
10466 CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */
10467 switch(SIT(c,syntax)) {
10468 case CNL: /* '\n' */
10469 if (syntax == BASESYNTAX)
10470 goto endword; /* exit outer loop */
10478 goto loop; /* continue outer loop */
10483 if ((eofmark == NULL || dblquote) &&
10485 USTPUTC(CTLESC, out);
10488 case CBACK: /* backslash */
10491 USTPUTC('\\', out);
10493 } else if (c == '\n') {
10499 if (dblquote && c != '\\' && c != '`' && c != '$'
10500 && (c != '"' || eofmark != NULL))
10501 USTPUTC('\\', out);
10502 if (SIT(c,SQSYNTAX) == CCTL)
10503 USTPUTC(CTLESC, out);
10504 else if (eofmark == NULL)
10505 USTPUTC(CTLQUOTEMARK, out);
10511 if (eofmark == NULL)
10512 USTPUTC(CTLQUOTEMARK, out);
10516 if (eofmark == NULL)
10517 USTPUTC(CTLQUOTEMARK, out);
10522 if (eofmark != NULL && arinest == 0 &&
10527 syntax = ARISYNTAX;
10529 } else if (eofmark == NULL &&
10531 syntax = BASESYNTAX;
10537 case CVAR: /* '$' */
10538 PARSESUB(); /* parse substitution */
10540 case CENDVAR: /* '}' */
10543 if (dqvarnest > 0) {
10546 USTPUTC(CTLENDVAR, out);
10551 #ifdef ASH_MATH_SUPPORT
10552 case CLP: /* '(' in arithmetic */
10556 case CRP: /* ')' in arithmetic */
10557 if (parenlevel > 0) {
10561 if (pgetc() == ')') {
10562 if (--arinest == 0) {
10563 USTPUTC(CTLENDARI, out);
10564 syntax = prevsyntax;
10565 if (syntax == DQSYNTAX)
10573 * unbalanced parens
10574 * (don't 2nd guess - no error)
10582 case CBQUOTE: /* '`' */
10586 goto endword; /* exit outer loop */
10591 goto endword; /* exit outer loop */
10602 if (syntax == ARISYNTAX)
10603 synerror("Missing '))'");
10604 if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
10605 synerror("Unterminated quoted string");
10606 if (varnest != 0) {
10607 startlinno = plinno;
10608 synerror("Missing '}'");
10610 USTPUTC('\0', out);
10611 len = out - stackblock();
10612 out = stackblock();
10613 if (eofmark == NULL) {
10614 if ((c == '>' || c == '<')
10617 && (*out == '\0' || is_digit(*out))) {
10619 return lasttoken = TREDIR;
10624 quoteflag = quotef;
10625 backquotelist = bqlist;
10626 grabstackblock(len);
10628 return lasttoken = TWORD;
10629 /* end of readtoken routine */
10634 * Check to see whether we are at the end of the here document. When this
10635 * is called, c is set to the first character of the next input line. If
10636 * we are at the end of the here document, this routine sets the c to PEOF.
10647 while (c == '\t') {
10651 if (c == *eofmark) {
10652 if (pfgets(line, sizeof line) != NULL) {
10656 for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
10657 if (*p == '\n' && *q == '\0') {
10660 needprompt = doprompt;
10662 pushstring(line, strlen(line), NULL);
10667 goto checkend_return;
10672 * Parse a redirection operator. The variable "out" points to a string
10673 * specifying the fd to be redirected. The variable "c" contains the
10674 * first character of the redirection operator.
10681 np = (union node *)stalloc(sizeof (struct nfile));
10686 np->type = NAPPEND;
10695 } else { /* c == '<' */
10697 switch (c = pgetc()) {
10699 if (sizeof (struct nfile) != sizeof (struct nhere)) {
10700 np = (union node *)stalloc(sizeof (struct nhere));
10704 heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
10705 heredoc->here = np;
10706 if ((c = pgetc()) == '-') {
10707 heredoc->striptabs = 1;
10709 heredoc->striptabs = 0;
10715 np->type = NFROMFD;
10719 np->type = NFROMTO;
10729 np->nfile.fd = digit_val(fd);
10731 goto parseredir_return;
10736 * Parse a substitution. At this point, we have read the dollar sign
10737 * and nothing else.
10745 static const char types[] = "}-+?=";
10750 (c != '(' && c != '{' && !is_name(c) && !is_special(c))
10754 } else if (c == '(') { /* $(command) or $((arith)) */
10755 if (pgetc() == '(') {
10762 USTPUTC(CTLVAR, out);
10763 typeloc = out - stackblock();
10764 USTPUTC(VSNORMAL, out);
10765 subtype = VSNORMAL;
10769 if ((c = pgetc()) == '}')
10772 subtype = VSLENGTH;
10777 if (c > PEOA && is_name(c)) {
10781 } while (c > PEOA && is_in_name(c));
10782 } else if (is_digit(c)) {
10786 } while (is_digit(c));
10788 else if (is_special(c)) {
10793 badsub: synerror("Bad substitution");
10797 if (subtype == 0) {
10804 p = strchr(types, c);
10807 subtype = p - types + VSNORMAL;
10813 subtype = c == '#' ? VSTRIMLEFT :
10826 if (dblquote || arinest)
10828 *(stackblock() + typeloc) = subtype | flags;
10829 if (subtype != VSNORMAL) {
10836 goto parsesub_return;
10841 * Called to parse command substitutions. Newstyle is set if the command
10842 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
10843 * list of commands (passed by reference), and savelen is the number of
10844 * characters on the top of the stack which must be preserved.
10848 struct nodelist **nlpp;
10851 char *volatile str;
10852 struct jmploc jmploc;
10853 struct jmploc *volatile savehandler;
10857 (void) &saveprompt;
10860 savepbq = parsebackquote;
10861 if (setjmp(jmploc.loc)) {
10864 parsebackquote = 0;
10865 handler = savehandler;
10866 longjmp(handler->loc, 1);
10870 savelen = out - stackblock();
10872 str = ckmalloc(savelen);
10873 memcpy(str, stackblock(), savelen);
10875 savehandler = handler;
10879 /* We must read until the closing backquote, giving special
10880 treatment to some slashes, and then push the string and
10881 reread it as input, interpreting it normally. */
10888 STARTSTACKSTR(pout);
10894 switch (pc = pgetc()) {
10899 if ((pc = pgetc()) == '\n') {
10906 * If eating a newline, avoid putting
10907 * the newline into the new character
10908 * stream (via the STPUTC after the
10913 if (pc != '\\' && pc != '`' && pc != '$'
10914 && (!dblquote || pc != '"'))
10915 STPUTC('\\', pout);
10925 startlinno = plinno;
10926 synerror("EOF in backquote substitution");
10930 needprompt = doprompt;
10939 STPUTC('\0', pout);
10940 psavelen = pout - stackblock();
10941 if (psavelen > 0) {
10942 pstr = grabstackstr(pout);
10943 setinputstring(pstr);
10948 nlpp = &(*nlpp)->next;
10949 *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
10950 (*nlpp)->next = NULL;
10951 parsebackquote = oldstyle;
10954 saveprompt = doprompt;
10961 doprompt = saveprompt;
10963 if (readtoken() != TRP)
10970 * Start reading from old file again, ignoring any pushed back
10971 * tokens left from the backquote parsing
10976 while (stackblocksize() <= savelen)
10978 STARTSTACKSTR(out);
10980 memcpy(out, str, savelen);
10981 STADJUST(savelen, out);
10987 parsebackquote = savepbq;
10988 handler = savehandler;
10989 if (arinest || dblquote)
10990 USTPUTC(CTLBACKQ | CTLQUOTE, out);
10992 USTPUTC(CTLBACKQ, out);
10994 goto parsebackq_oldreturn;
10996 goto parsebackq_newreturn;
11000 * Parse an arithmetic expansion (indicate start of one and set state)
11004 if (++arinest == 1) {
11005 prevsyntax = syntax;
11006 syntax = ARISYNTAX;
11007 USTPUTC(CTLARI, out);
11014 * we collapse embedded arithmetic expansion to
11015 * parenthesis, which should be equivalent
11019 goto parsearith_return;
11022 } /* end of readtoken */
11026 * Returns true if the text contains nothing to expand (no dollar signs
11038 while ((c = *p++) != '\0') {
11039 if (c == CTLQUOTEMARK)
11043 else if (SIT(c,BASESYNTAX) == CCTL)
11051 * Return true if the argument is a legal variable name (a letter or
11052 * underscore followed by zero or more letters, underscores, and digits).
11056 goodname(const char *name)
11064 if (! is_in_name(*p))
11072 * Called when an unexpected token is read during the parse. The argument
11073 * is the token that is expected, or -1 if more than one type of token can
11074 * occur at this point.
11084 l = sprintf(msg, "%s unexpected", tokname(lasttoken));
11086 sprintf(msg+l, " (expecting %s)", tokname(token));
11093 synerror(const char *msg)
11096 out2fmt("%s: %d: ", commandname, startlinno);
11097 out2fmt("Syntax error: %s\n", msg);
11098 error((char *)NULL);
11104 * called by editline -- any expansions to the prompt
11105 * should be added here.
11108 setprompt(int whichprompt)
11111 switch (whichprompt) {
11126 * Code for dealing with input/output redirection.
11129 #define EMPTY -2 /* marks an unused slot in redirtab */
11131 # define PIPESIZE 4096 /* amount of buffering in a pipe */
11133 # define PIPESIZE PIPE_BUF
11138 * Open a file in noclobber mode.
11139 * The code was copied from bash.
11142 noclobberopen(const char *fname)
11145 struct stat finfo, finfo2;
11148 * If the file exists and is a regular file, return an error
11151 r = stat(fname, &finfo);
11152 if (r == 0 && S_ISREG(finfo.st_mode)) {
11158 * If the file was not present (r != 0), make sure we open it
11159 * exclusively so that if it is created before we open it, our open
11160 * will fail. Make sure that we do not truncate an existing file.
11161 * Note that we don't turn on O_EXCL unless the stat failed -- if the
11162 * file was not a regular file, we leave O_EXCL off.
11165 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
11166 fd = open(fname, O_WRONLY|O_CREAT, 0666);
11168 /* If the open failed, return the file descriptor right away. */
11173 * OK, the open succeeded, but the file may have been changed from a
11174 * non-regular file to a regular file between the stat and the open.
11175 * We are assuming that the O_EXCL open handles the case where FILENAME
11176 * did not exist and is symlinked to an existing file between the stat
11181 * If we can open it and fstat the file descriptor, and neither check
11182 * revealed that it was a regular file, and the file has not been
11183 * replaced, return the file descriptor.
11185 if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) &&
11186 finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
11189 /* The file has been replaced. badness. */
11196 * Handle here documents. Normally we fork off a process to write the
11197 * data to a pipe. If the document is short, we can stuff the data in
11198 * the pipe without forking.
11202 openhere(const union node *redir)
11208 error("Pipe call failed");
11209 if (redir->type == NHERE) {
11210 len = strlen(redir->nhere.doc->narg.text);
11211 if (len <= PIPESIZE) {
11212 xwrite(pip[1], redir->nhere.doc->narg.text, len);
11216 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
11218 signal(SIGINT, SIG_IGN);
11219 signal(SIGQUIT, SIG_IGN);
11220 signal(SIGHUP, SIG_IGN);
11222 signal(SIGTSTP, SIG_IGN);
11224 signal(SIGPIPE, SIG_DFL);
11225 if (redir->type == NHERE)
11226 xwrite(pip[1], redir->nhere.doc->narg.text, len);
11228 expandhere(redir->nhere.doc, pip[1]);
11238 openredirect(const union node *redir)
11243 switch (redir->nfile.type) {
11245 fname = redir->nfile.expfname;
11246 if ((f = open(fname, O_RDONLY)) < 0)
11250 fname = redir->nfile.expfname;
11251 if ((f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
11255 /* Take care of noclobber mode. */
11257 fname = redir->nfile.expfname;
11258 if ((f = noclobberopen(fname)) < 0)
11263 fname = redir->nfile.expfname;
11265 if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
11268 if ((f = creat(fname, 0666)) < 0)
11273 fname = redir->nfile.expfname;
11275 if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
11278 if ((f = open(fname, O_WRONLY)) < 0
11279 && (f = creat(fname, 0666)) < 0)
11281 lseek(f, (off_t)0, 2);
11288 /* Fall through to eliminate warning. */
11295 f = openhere(redir);
11301 error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
11303 error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
11308 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
11309 * old file descriptors are stashed away so that the redirection can be
11310 * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
11311 * standard output, and the standard error if it becomes a duplicate of
11316 redirect(union node *redir, int flags)
11319 struct redirtab *sv = NULL;
11324 int fd1dup = flags & REDIR_BACKQ;; /* stdout `cmd` redir to pipe */
11326 if (flags & REDIR_PUSH) {
11327 sv = ckmalloc(sizeof (struct redirtab));
11328 for (i = 0 ; i < 10 ; i++)
11329 sv->renamed[i] = EMPTY;
11330 sv->next = redirlist;
11333 for (n = redir ; n ; n = n->nfile.next) {
11336 if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) &&
11337 n->ndup.dupfd == fd)
11338 continue; /* redirect from/to same file descriptor */
11341 newfd = openredirect(n);
11342 if ((flags & REDIR_PUSH) && sv->renamed[fd] == EMPTY) {
11345 } else if ((i = fcntl(fd, F_DUPFD, 10)) == -1) {
11349 dupredirect(n, newfd, fd1dup);
11359 error("%d: %m", fd);
11365 if (flags & REDIR_PUSH) {
11366 sv->renamed[fd] = i;
11369 } else if (fd != newfd) {
11375 dupredirect(n, newfd, fd1dup);
11382 dupredirect(const union node *redir, int f, int fd1dup)
11384 int fd = redir->nfile.fd;
11388 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
11389 if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
11390 if (redir->ndup.dupfd!=1 || fd1dup!=1)
11391 dup_as_newfd(redir->ndup.dupfd, fd);
11397 dup_as_newfd(f, fd);
11406 * Undo the effects of the last redirection.
11412 struct redirtab *rp = redirlist;
11416 for (i = 0 ; i < 10 ; i++) {
11417 if (rp->renamed[i] != EMPTY) {
11421 if (rp->renamed[i] >= 0) {
11422 dup_as_newfd(rp->renamed[i], i);
11423 close(rp->renamed[i]);
11427 redirlist = rp->next;
11433 * Discard all saved file descriptors.
11438 struct redirtab *rp;
11441 for (rp = redirlist ; rp ; rp = rp->next) {
11442 for (i = 0 ; i < 10 ; i++) {
11443 if (rp->renamed[i] >= 0) {
11444 close(rp->renamed[i]);
11446 rp->renamed[i] = EMPTY;
11453 * Copy a file descriptor to be >= to. Returns -1
11454 * if the source file descriptor is closed, EMPTY if there are no unused
11455 * file descriptors left.
11459 dup_as_newfd(from, to)
11465 newfd = fcntl(from, F_DUPFD, to);
11467 if (errno == EMFILE)
11470 error("%d: %m", from);
11476 static void shtree (union node *, int, char *, FILE*);
11477 static void shcmd (union node *, FILE *);
11478 static void sharg (union node *, FILE *);
11479 static void indent (int, char *, FILE *);
11480 static void trstring (char *);
11487 trputs("showtree called\n");
11488 shtree(n, 1, NULL, stdout);
11493 shtree(n, ind, pfx, fp)
11499 struct nodelist *lp;
11505 indent(ind, pfx, fp);
11516 shtree(n->nbinary.ch1, ind, NULL, fp);
11519 shtree(n->nbinary.ch2, ind, NULL, fp);
11527 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
11532 if (n->npipe.backgnd)
11538 fprintf(fp, "<node type %d>", n->type);
11558 for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
11564 for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
11570 if ((np->nfile.type <= NFROMFD) && (np->nfile.type >= NTO)) {
11571 s = redir_strings[np->nfile.type - NTO];
11577 switch (np->nfile.type) {
11578 case NTO: s = ">"; dftfd = 1; break;
11579 case NAPPEND: s = ">>"; dftfd = 1; break;
11580 case NTOFD: s = ">&"; dftfd = 1; break;
11581 case NTOOV: s = ">|"; dftfd = 1; break;
11582 case NFROM: s = "<"; dftfd = 0; break;
11583 case NFROMFD: s = "<&"; dftfd = 0; break;
11584 case NFROMTO: s = "<>"; dftfd = 0; break;
11585 default: s = "*error*"; dftfd = 0; break;
11588 if (np->nfile.fd != dftfd)
11589 fprintf(fp, "%d", np->nfile.fd);
11591 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
11592 fprintf(fp, "%d", np->ndup.dupfd);
11594 sharg(np->nfile.fname, fp);
11608 struct nodelist *bqlist;
11611 if (arg->type != NARG) {
11612 printf("<node type %d>\n", arg->type);
11616 bqlist = arg->narg.backquote;
11617 for (p = arg->narg.text ; *p ; p++) {
11626 if (subtype == VSLENGTH)
11632 if (subtype & VSNUL)
11635 switch (subtype & VSTYPE) {
11654 case VSTRIMLEFTMAX:
11661 case VSTRIMRIGHTMAX:
11668 printf("<subtype %d>", subtype);
11675 case CTLBACKQ|CTLQUOTE:
11678 shtree(bqlist->n, -1, NULL, fp);
11690 indent(amount, pfx, fp)
11697 for (i = 0 ; i < amount ; i++) {
11698 if (pfx && i == amount - 1)
11716 static int debug = 1;
11718 static int debug = 0;
11726 if (tracefile == NULL)
11728 putc(c, tracefile);
11734 trace(const char *fmt, ...)
11738 if (tracefile != NULL) {
11739 (void) vfprintf(tracefile, fmt, va);
11740 if (strchr(fmt, '\n'))
11741 (void) fflush(tracefile);
11751 if (tracefile == NULL)
11753 fputs(s, tracefile);
11754 if (strchr(s, '\n'))
11766 if (tracefile == NULL)
11768 putc('"', tracefile);
11769 for (p = s ; *p ; p++) {
11771 case '\n': c = 'n'; goto backslash;
11772 case '\t': c = 't'; goto backslash;
11773 case '\r': c = 'r'; goto backslash;
11774 case '"': c = '"'; goto backslash;
11775 case '\\': c = '\\'; goto backslash;
11776 case CTLESC: c = 'e'; goto backslash;
11777 case CTLVAR: c = 'v'; goto backslash;
11778 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
11779 case CTLBACKQ: c = 'q'; goto backslash;
11780 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
11781 backslash: putc('\\', tracefile);
11782 putc(c, tracefile);
11785 if (*p >= ' ' && *p <= '~')
11786 putc(*p, tracefile);
11788 putc('\\', tracefile);
11789 putc(*p >> 6 & 03, tracefile);
11790 putc(*p >> 3 & 07, tracefile);
11791 putc(*p & 07, tracefile);
11796 putc('"', tracefile);
11804 if (tracefile == NULL)
11809 putc(' ', tracefile);
11811 putc('\n', tracefile);
11826 #ifdef not_this_way
11829 if ((p = getenv("HOME")) == NULL) {
11830 if (geteuid() == 0)
11836 strcat(s, "/trace");
11839 strcpy(s, "./trace");
11840 #endif /* not_this_way */
11841 if ((tracefile = fopen(s, "a")) == NULL) {
11842 fprintf(stderr, "Can't open %s\n", s);
11846 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
11847 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
11849 fputs("\nTracing started.\n", tracefile);
11856 * The trap builtin.
11860 trapcmd(argc, argv)
11869 for (signo = 0 ; signo < NSIG ; signo++) {
11870 if (trap[signo] != NULL) {
11874 p = single_quote(trap[signo]);
11875 sn = sys_siglist[signo];
11877 sn = u_signal_names(0, &signo, 0);
11880 printf("trap -- %s %s\n", p, sn);
11892 if ((signo = decode_signal(*ap, 0)) < 0)
11893 error("%s: bad trap", *ap);
11896 if (action[0] == '-' && action[1] == '\0')
11899 action = savestr(action);
11902 ckfree(trap[signo]);
11903 trap[signo] = action;
11918 * Set the signal handler for the specified signal. The routine figures
11919 * out what it should be set to.
11923 setsignal(int signo)
11927 struct sigaction act;
11929 if ((t = trap[signo]) == NULL)
11931 else if (*t != '\0')
11935 if (rootshell && action == S_DFL) {
11938 if (iflag || minusc || sflag == 0)
11964 t = &sigmode[signo - 1];
11967 * current setting unknown
11969 if (sigaction(signo, 0, &act) == -1) {
11971 * Pretend it worked; maybe we should give a warning
11972 * here, but other shells don't. We don't alter
11973 * sigmode, so that we retry every time.
11977 if (act.sa_handler == SIG_IGN) {
11978 if (mflag && (signo == SIGTSTP ||
11979 signo == SIGTTIN || signo == SIGTTOU)) {
11980 *t = S_IGN; /* don't hard ignore these */
11984 *t = S_RESET; /* force to be set */
11987 if (*t == S_HARD_IGN || *t == action)
11989 act.sa_handler = ((action == S_CATCH) ? onsig
11990 : ((action == S_IGN) ? SIG_IGN : SIG_DFL));
11993 sigemptyset(&act.sa_mask);
11994 sigaction(signo, &act, 0);
12005 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
12006 signal(signo, SIG_IGN);
12008 sigmode[signo - 1] = S_HARD_IGN;
12019 if (signo == SIGINT && trap[SIGINT] == NULL) {
12023 gotsig[signo - 1] = 1;
12029 * Called to execute a trap. Perhaps we should avoid entering new trap
12030 * handlers while we are executing a trap handler.
12040 for (i = 1 ; ; i++) {
12047 savestatus=exitstatus;
12048 evalstring(trap[i], 0);
12049 exitstatus=savestatus;
12056 * Called to exit the shell.
12060 exitshell(int status)
12062 struct jmploc loc1, loc2;
12065 TRACE(("exitshell(%d) pid=%d\n", status, getpid()));
12066 if (setjmp(loc1.loc)) {
12069 if (setjmp(loc2.loc)) {
12073 if ((p = trap[0]) != NULL && *p != '\0') {
12077 l1: handler = &loc2; /* probably unnecessary */
12086 static int decode_signal(const char *string, int minsig)
12089 const char *name = u_signal_names(string, &signo, minsig);
12091 return name ? signo : -1;
12094 static struct var **hashvar (const char *);
12095 static void showvars (const char *, int, int);
12096 static struct var **findvar (struct var **, const char *);
12099 * Initialize the varable symbol tables and import the environment
12103 * This routine initializes the builtin variables. It is called when the
12104 * shell is initialized and again when a shell procedure is spawned.
12109 const struct varinit *ip;
12113 for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
12114 if ((vp->flags & VEXPORT) == 0) {
12115 vpp = hashvar(ip->text);
12118 vp->text = strdup(ip->text);
12119 vp->flags = ip->flags;
12120 vp->func = ip->func;
12124 * PS1 depends on uid
12126 if ((vps1.flags & VEXPORT) == 0) {
12127 vpp = hashvar("PS1=");
12130 vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
12131 vps1.flags = VSTRFIXED|VTEXTFIXED;
12136 * Set the value of a variable. The flags argument is ored with the
12137 * flags of the variable. If val is NULL, the variable is unset.
12141 setvar(name, val, flags)
12142 const char *name, *val;
12158 if (! is_in_name(*p)) {
12159 if (*p == '\0' || *p == '=')
12165 namelen = p - name;
12167 error("%.*s: bad variable name", namelen, name);
12168 len = namelen + 2; /* 2 is space for '=' and '\0' */
12172 len += vallen = strlen(val);
12175 nameeq = ckmalloc(len);
12176 memcpy(nameeq, name, namelen);
12177 nameeq[namelen] = '=';
12179 memcpy(nameeq + namelen + 1, val, vallen + 1);
12181 nameeq[namelen + 1] = '\0';
12183 setvareq(nameeq, flags);
12190 * Same as setvar except that the variable and value are passed in
12191 * the first argument as name=value. Since the first argument will
12192 * be actually stored in the table, it should not be a string that
12201 struct var *vp, **vpp;
12204 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
12205 if ((vp = *findvar(vpp, s))) {
12206 if (vp->flags & VREADONLY) {
12207 size_t len = strchr(s, '=') - s;
12208 error("%.*s: is read only", len, s);
12212 if (vp->func && (flags & VNOFUNC) == 0)
12213 (*vp->func)(strchr(s, '=') + 1);
12215 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
12218 vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
12219 vp->flags |= flags;
12223 * We could roll this to a function, to handle it as
12224 * a regular variable function callback, but why bother?
12226 if (iflag && (vp == &vmpath || (vp == &vmail && !mpathset())))
12232 vp = ckmalloc(sizeof (*vp));
12243 * Process a linked list of variable assignments.
12248 struct strlist *mylist;
12250 struct strlist *lp;
12253 for (lp = mylist ; lp ; lp = lp->next) {
12254 setvareq(savestr(lp->text), 0);
12262 * Find the value of a variable. Returns NULL if not set.
12265 static const char *
12271 if ((v = *findvar(hashvar(name), name)) && !(v->flags & VUNSET)) {
12272 return strchr(v->text, '=') + 1;
12280 * Search the environment of a builtin command.
12283 static const char *
12284 bltinlookup(const char *name)
12286 const struct strlist *sp;
12288 for (sp = cmdenviron ; sp ; sp = sp->next) {
12289 if (varequal(sp->text, name))
12290 return strchr(sp->text, '=') + 1;
12292 return lookupvar(name);
12298 * Generate a list of exported variables. This routine is used to construct
12299 * the third argument to execve when executing a program.
12311 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
12312 for (vp = *vpp ; vp ; vp = vp->next)
12313 if (vp->flags & VEXPORT)
12316 ep = env = stalloc((nenv + 1) * sizeof *env);
12317 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
12318 for (vp = *vpp ; vp ; vp = vp->next)
12319 if (vp->flags & VEXPORT)
12328 * Called when a shell procedure is invoked to clear out nonexported
12329 * variables. It is also necessary to reallocate variables of with
12330 * VSTACK set since these are currently allocated on the stack.
12336 struct var *vp, **prev;
12338 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
12339 for (prev = vpp ; (vp = *prev) != NULL ; ) {
12340 if ((vp->flags & VEXPORT) == 0) {
12342 if ((vp->flags & VTEXTFIXED) == 0)
12344 if ((vp->flags & VSTRFIXED) == 0)
12347 if (vp->flags & VSTACK) {
12348 vp->text = savestr(vp->text);
12349 vp->flags &=~ VSTACK;
12361 * Command to list all variables which are set. Currently this command
12362 * is invoked from the set command when the set command is called without
12367 showvarscmd(argc, argv)
12371 showvars(nullstr, VUNSET, VUNSET);
12378 * The export and readonly commands.
12382 exportcmd(argc, argv)
12389 int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
12392 listsetvar(cmdenviron);
12393 pflag = (nextopt("p") == 'p');
12394 if (argc > 1 && !pflag) {
12395 while ((name = *argptr++) != NULL) {
12396 if ((p = strchr(name, '=')) != NULL) {
12399 if ((vp = *findvar(hashvar(name), name))) {
12404 setvar(name, p, flag);
12408 showvars(argv[0], flag, 0);
12415 * The "local" command.
12418 /* funcnest nonzero if we are currently evaluating a function */
12421 localcmd(argc, argv)
12428 error("Not in a function");
12429 while ((name = *argptr++) != NULL) {
12437 * Make a variable a local variable. When a variable is made local, it's
12438 * value and flags are saved in a localvar structure. The saved values
12439 * will be restored when the shell function returns. We handle the name
12440 * "-" as a special case.
12447 struct localvar *lvp;
12452 lvp = ckmalloc(sizeof (struct localvar));
12453 if (name[0] == '-' && name[1] == '\0') {
12455 p = ckmalloc(sizeof optet_vals);
12456 lvp->text = memcpy(p, optet_vals, sizeof optet_vals);
12459 vpp = hashvar(name);
12460 vp = *findvar(vpp, name);
12462 if (strchr(name, '='))
12463 setvareq(savestr(name), VSTRFIXED);
12465 setvar(name, NULL, VSTRFIXED);
12466 vp = *vpp; /* the new variable */
12468 lvp->flags = VUNSET;
12470 lvp->text = vp->text;
12471 lvp->flags = vp->flags;
12472 vp->flags |= VSTRFIXED|VTEXTFIXED;
12473 if (strchr(name, '='))
12474 setvareq(savestr(name), 0);
12478 lvp->next = localvars;
12485 * Called after a function returns.
12490 struct localvar *lvp;
12493 while ((lvp = localvars) != NULL) {
12494 localvars = lvp->next;
12496 if (vp == NULL) { /* $- saved */
12497 memcpy(optet_vals, lvp->text, sizeof optet_vals);
12499 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
12500 (void)unsetvar(vp->text);
12502 if ((vp->flags & VTEXTFIXED) == 0)
12504 vp->flags = lvp->flags;
12505 vp->text = lvp->text;
12513 setvarcmd(argc, argv)
12518 return unsetcmd(argc, argv);
12519 else if (argc == 3)
12520 setvar(argv[1], argv[2], 0);
12522 error("List assignment not implemented");
12528 * The unset builtin command. We unset the function before we unset the
12529 * variable to allow a function to be unset when there is a readonly variable
12530 * with the same name.
12534 unsetcmd(argc, argv)
12544 while ((i = nextopt("vf")) != '\0') {
12550 if (flg_func == 0 && flg_var == 0)
12553 for (ap = argptr; *ap ; ap++) {
12557 ret |= unsetvar(*ap);
12564 * Unset the specified variable.
12568 unsetvar(const char *s)
12573 vpp = findvar(hashvar(s), s);
12576 if (vp->flags & VREADONLY)
12579 if (*(strchr(vp->text, '=') + 1) != '\0')
12580 setvar(s, nullstr, 0);
12581 vp->flags &= ~VEXPORT;
12582 vp->flags |= VUNSET;
12583 if ((vp->flags & VSTRFIXED) == 0) {
12584 if ((vp->flags & VTEXTFIXED) == 0)
12599 * Find the appropriate entry in the hash table from the name.
12602 static struct var **
12603 hashvar(const char *p)
12605 unsigned int hashval;
12607 hashval = ((unsigned char) *p) << 4;
12608 while (*p && *p != '=')
12609 hashval += (unsigned char) *p++;
12610 return &vartab[hashval % VTABSIZE];
12616 * Returns true if the two strings specify the same varable. The first
12617 * variable name is terminated by '='; the second may be terminated by
12618 * either '=' or '\0'.
12622 varequal(const char *p, const char *q)
12624 while (*p == *q++) {
12628 if (*p == '=' && *(q - 1) == '\0')
12634 showvars(const char *myprefix, int mask, int xor)
12638 const char *sep = myprefix == nullstr ? myprefix : spcstr;
12640 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
12641 for (vp = *vpp ; vp ; vp = vp->next) {
12642 if ((vp->flags & mask) ^ xor) {
12646 p = strchr(vp->text, '=') + 1;
12647 len = p - vp->text;
12648 p = single_quote(p);
12650 printf("%s%s%.*s%s\n", myprefix, sep, len,
12658 static struct var **
12659 findvar(struct var **vpp, const char *name)
12661 for (; *vpp; vpp = &(*vpp)->next) {
12662 if (varequal((*vpp)->text, name)) {
12670 * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
12671 * This file contains code for the times builtin.
12672 * $Id: ash.c,v 1.21 2001/08/10 21:11:56 andersen Exp $
12674 static int timescmd (int argc, char **argv)
12677 long int clk_tck = sysconf(_SC_CLK_TCK);
12680 printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
12681 (int) (buf.tms_utime / clk_tck / 60),
12682 ((double) buf.tms_utime) / clk_tck,
12683 (int) (buf.tms_stime / clk_tck / 60),
12684 ((double) buf.tms_stime) / clk_tck,
12685 (int) (buf.tms_cutime / clk_tck / 60),
12686 ((double) buf.tms_cutime) / clk_tck,
12687 (int) (buf.tms_cstime / clk_tck / 60),
12688 ((double) buf.tms_cstime) / clk_tck);
12692 #ifdef ASH_MATH_SUPPORT
12693 /* The let builtin. */
12694 int letcmd(int argc, char **argv)
12699 char *tmp, *expression, p[13];
12700 expression = strchr(argv[1], '=');
12702 /* Cannot use 'error()' here, or the return code
12703 * will be incorrect */
12704 out2fmt("sh: let: syntax error: \"%s\"\n", argv[1]);
12707 *expression = '\0';
12708 tmp = ++expression;
12709 result = arith(tmp, &errcode);
12711 /* Cannot use 'error()' here, or the return code
12712 * will be incorrect */
12713 out2fmt("sh: let: ");
12715 out2fmt("divide by zero");
12717 out2fmt("syntax error: \"%s=%s\"\n", argv[1], expression);
12720 snprintf(p, 12, "%ld", result);
12721 setvar(argv[1], savestr(p), 0);
12722 } else if (argc >= 3)
12723 synerror("invalid operand");
12731 * Copyright (c) 1989, 1991, 1993, 1994
12732 * The Regents of the University of California. All rights reserved.
12734 * This code is derived from software contributed to Berkeley by
12735 * Kenneth Almquist.
12737 * Redistribution and use in source and binary forms, with or without
12738 * modification, are permitted provided that the following conditions
12740 * 1. Redistributions of source code must retain the above copyright
12741 * notice, this list of conditions and the following disclaimer.
12742 * 2. Redistributions in binary form must reproduce the above copyright
12743 * notice, this list of conditions and the following disclaimer in the
12744 * documentation and/or other materials provided with the distribution.
12746 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
12747 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
12749 * 4. Neither the name of the University nor the names of its contributors
12750 * may be used to endorse or promote products derived from this software
12751 * without specific prior written permission.
12753 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
12754 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
12755 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
12756 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
12757 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
12758 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
12759 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
12760 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
12761 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
12762 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
projects / oweals / busybox.git / blob