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 /* Enable this to compile in extra debugging noise. When debugging is
37 * on, debugging info will be written to $HOME/trace and a quit signal
38 * will generate a core dump. */
41 /* These are here to work with glibc -- Don't change these... */
63 #include <sys/cdefs.h>
64 #include <sys/ioctl.h>
65 #include <sys/param.h>
66 #include <sys/resource.h>
68 #include <sys/times.h>
69 #include <sys/types.h>
74 #if !defined(FNMATCH_BROKEN)
77 #if !defined(GLOB_BROKEN)
81 #ifdef CONFIG_ASH_JOB_CONTROL
89 * This file was generated by the mksyntax program.
93 #define CWORD 0 /* character is nothing special */
94 #define CNL 1 /* newline character */
95 #define CBACK 2 /* a backslash character */
96 #define CSQUOTE 3 /* single quote */
97 #define CDQUOTE 4 /* double quote */
98 #define CENDQUOTE 5 /* a terminating quote */
99 #define CBQUOTE 6 /* backwards single quote */
100 #define CVAR 7 /* a dollar sign */
101 #define CENDVAR 8 /* a '}' character */
102 #define CLP 9 /* a left paren in arithmetic */
103 #define CRP 10 /* a right paren in arithmetic */
104 #define CENDFILE 11 /* end of file */
105 #define CCTL 12 /* like CWORD, except it must be escaped */
106 #define CSPCL 13 /* these terminate a word */
107 #define CIGN 14 /* character should be ignored */
127 #define TENDBQUOTE 13
147 /* control characters in argument strings */
148 #define CTLESC '\201'
149 #define CTLVAR '\202'
150 #define CTLENDVAR '\203'
151 #define CTLBACKQ '\204'
152 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
153 /* CTLBACKQ | CTLQUOTE == '\205' */
154 #define CTLARI '\206'
155 #define CTLENDARI '\207'
156 #define CTLQUOTEMARK '\210'
159 #define is_digit(c) ((c)>='0' && (c)<='9')
160 #define is_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalpha((unsigned char) (c))))
161 #define is_in_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalnum((unsigned char) (c))))
164 * is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
165 * (assuming ascii char codes, as the original implementation did)
167 #define is_special(c) \
168 ( (((unsigned int)c) - 33 < 32) \
169 && ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1))
171 #define digit_val(c) ((c) - '0')
174 #define S_DFL 1 /* default signal handling (SIG_DFL) */
175 #define S_CATCH 2 /* signal is caught */
176 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
177 #define S_HARD_IGN 4 /* signal is ignored permenantly */
178 #define S_RESET 5 /* temporary - to reset a hard ignored sig */
181 /* variable substitution byte (follows CTLVAR) */
182 #define VSTYPE 0x0f /* type of variable substitution */
183 #define VSNUL 0x10 /* colon--treat the empty string as unset */
184 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
186 /* values of VSTYPE field */
187 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
188 #define VSMINUS 0x2 /* ${var-text} */
189 #define VSPLUS 0x3 /* ${var+text} */
190 #define VSQUESTION 0x4 /* ${var?message} */
191 #define VSASSIGN 0x5 /* ${var=text} */
192 #define VSTRIMLEFT 0x6 /* ${var#pattern} */
193 #define VSTRIMLEFTMAX 0x7 /* ${var##pattern} */
194 #define VSTRIMRIGHT 0x8 /* ${var%pattern} */
195 #define VSTRIMRIGHTMAX 0x9 /* ${var%%pattern} */
196 #define VSLENGTH 0xa /* ${#var} */
198 /* flags passed to redirect */
199 #define REDIR_PUSH 01 /* save previous values of file descriptors */
200 #define REDIR_BACKQ 02 /* save the command output to pipe */
203 * BSD setjmp saves the signal mask, which violates ANSI C and takes time,
204 * so we use _setjmp instead.
208 #define setjmp(jmploc) _setjmp(jmploc)
209 #define longjmp(jmploc, val) _longjmp(jmploc, val)
213 * Most machines require the value returned from malloc to be aligned
214 * in some way. The following macro will get this right on many machines.
223 #define ALIGN(nbytes) (((nbytes) + sizeof(union align) - 1) & ~(sizeof(union align) - 1))
226 #ifdef CONFIG_LOCALE_SUPPORT
228 static void change_lc_all(const char *value);
229 static void change_lc_ctype(const char *value);
233 * These macros allow the user to suspend the handling of interrupt signals
234 * over a period of time. This is similar to SIGHOLD to or sigblock, but
235 * much more efficient and portable. (But hacking the kernel is so much
236 * more fun than worrying about efficiency and portability. :-))
239 static void onint (void);
240 static volatile int suppressint;
241 static volatile int intpending;
243 #define INTOFF suppressint++
244 #ifndef CONFIG_ASH_OPTIMIZE_FOR_SIZE
245 #define INTON { if (--suppressint == 0 && intpending) onint(); }
246 #define FORCEINTON {suppressint = 0; if (intpending) onint();}
248 static void __inton (void);
249 static void forceinton (void);
250 #define INTON __inton()
251 #define FORCEINTON forceinton()
254 #define CLEAR_PENDING_INT intpending = 0
255 #define int_pending() intpending
258 typedef void *pointer;
260 #define NULL (void *)0
263 static pointer stalloc (int);
264 static void stunalloc (pointer);
265 static void ungrabstackstr (char *, char *);
266 static char * growstackstr(void);
267 static char * makestrspace(size_t newlen);
268 static char *sstrdup (const char *);
271 * Parse trees for commands are allocated in lifo order, so we use a stack
272 * to make this more efficient, and also to avoid all sorts of exception
273 * handling code to handle interrupts in the middle of a parse.
275 * The size 504 was chosen because the Ultrix malloc handles that size
279 #define MINSIZE 504 /* minimum size of a block */
283 struct stack_block *prev;
287 static struct stack_block stackbase;
288 static struct stack_block *stackp = &stackbase;
289 static struct stackmark *markp;
290 static char *stacknxt = stackbase.space;
291 static int stacknleft = MINSIZE;
294 #define equal(s1, s2) (strcmp(s1, s2) == 0)
296 #define stackblock() stacknxt
297 #define stackblocksize() stacknleft
298 #define STARTSTACKSTR(p) p = stackblock(), sstrnleft = stackblocksize()
300 #define STPUTC(c, p) (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
301 #define CHECKSTRSPACE(n, p) { if (sstrnleft < n) p = makestrspace(n); }
302 #define STACKSTRNUL(p) (sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
305 #define USTPUTC(c, p) (--sstrnleft, *p++ = (c))
306 #define STUNPUTC(p) (++sstrnleft, --p)
307 #define STTOPC(p) p[-1]
308 #define STADJUST(amount, p) (p += (amount), sstrnleft -= (amount))
309 #define grabstackstr(p) stalloc(stackblocksize() - sstrnleft)
311 #define ckfree(p) free((pointer)(p))
315 #define TRACE(param) trace param
316 typedef union node unode;
317 static void trace (const char *, ...);
318 static void trargs (char **);
319 static void showtree (unode *);
320 static void trputc (int);
321 static void trputs (const char *);
322 static void opentrace (void);
357 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
358 #define EXP_TILDE 0x2 /* do normal tilde expansion */
359 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
360 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
361 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
362 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
367 static char optet_vals[NOPTS];
369 static const char * const optlist[NOPTS] = {
388 #define optent_name(optent) (optent+1)
389 #define optent_letter(optent) optent[0]
390 #define optent_val(optent) optet_vals[optent]
392 #define eflag optent_val(0)
393 #define fflag optent_val(1)
394 #define Iflag optent_val(2)
395 #define iflag optent_val(3)
396 #define mflag optent_val(4)
397 #define nflag optent_val(5)
398 #define sflag optent_val(6)
399 #define xflag optent_val(7)
400 #define vflag optent_val(8)
401 #define Vflag optent_val(9)
402 #define Eflag optent_val(10)
403 #define Cflag optent_val(11)
404 #define aflag optent_val(12)
405 #define bflag optent_val(13)
406 #define uflag optent_val(14)
407 #define qflag optent_val(15)
410 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
428 union node *redirect;
435 struct nodelist *cmdlist;
442 union node *redirect;
450 union node *elsepart;
481 struct nodelist *backquote;
519 struct nbinary nbinary;
522 struct nredir nredir;
526 struct nclist nclist;
536 struct nodelist *next;
540 struct backcmd { /* result of evalbackcmd */
541 int fd; /* file descriptor to read from */
542 char *buf; /* buffer */
543 int nleft; /* number of chars in buffer */
544 struct job *jp; /* job structure for command */
552 const struct builtincmd *cmd;
557 struct strlist *next;
563 struct strlist *list;
564 struct strlist **lastp;
568 struct strpush *prev; /* preceding string on stack */
571 #ifdef CONFIG_ASH_ALIAS
572 struct alias *ap; /* if push was associated with an alias */
574 char *string; /* remember the string since it may change */
578 struct parsefile *prev; /* preceding file on stack */
579 int linno; /* current line */
580 int fd; /* file descriptor (or -1 if string) */
581 int nleft; /* number of chars left in this line */
582 int lleft; /* number of chars left in this buffer */
583 char *nextc; /* next char in buffer */
584 char *buf; /* input buffer */
585 struct strpush *strpush; /* for pushing strings at this level */
586 struct strpush basestrpush; /* so pushing one is fast */
590 struct stack_block *stackp;
593 struct stackmark *marknext;
597 int nparam; /* # of positional parameters (without $0) */
598 unsigned char malloc; /* if parameter list dynamically allocated */
599 char **p; /* parameter list */
600 int optind; /* next parameter to be processed by getopts */
601 int optoff; /* used by getopts */
605 * When commands are first encountered, they are entered in a hash table.
606 * This ensures that a full path search will not have to be done for them
607 * on each invocation.
609 * We should investigate converting to a linear search, even though that
610 * would make the command name "hash" a misnomer.
612 #define CMDTABLESIZE 31 /* should be prime */
613 #define ARB 1 /* actual size determined at run time */
618 struct tblentry *next; /* next entry in hash chain */
619 union param param; /* definition of builtin function */
620 short cmdtype; /* index identifying command */
621 char rehash; /* if set, cd done since entry created */
622 char cmdname[ARB]; /* name of command */
626 static struct tblentry *cmdtable[CMDTABLESIZE];
627 static int builtinloc = -1; /* index in path of %builtin, or -1 */
628 static int exerrno = 0; /* Last exec error */
631 static void tryexec (char *, char **, char **);
632 static void printentry (struct tblentry *, int);
633 static void clearcmdentry (int);
634 static struct tblentry *cmdlookup (const char *, int);
635 static void delete_cmd_entry (void);
636 static int path_change (const char *, int *);
639 static void flushall (void);
640 static void out2fmt (const char *, ...)
641 __attribute__((__format__(__printf__,1,2)));
642 static int xwrite (int, const char *, int);
644 static inline void outstr (const char *p, FILE *file) { fputs(p, file); }
645 static void out1str(const char *p) { outstr(p, stdout); }
646 static void out2str(const char *p) { outstr(p, stderr); }
648 #ifndef CONFIG_ASH_OPTIMIZE_FOR_SIZE
649 #define out2c(c) putc((c), stderr)
651 static void out2c(int c) { putc(c, stderr); }
655 #ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
656 #define USE_SIT_FUNCTION
659 /* number syntax index */
660 #define BASESYNTAX 0 /* not in quotes */
661 #define DQSYNTAX 1 /* in double quotes */
662 #define SQSYNTAX 2 /* in single quotes */
663 #define ARISYNTAX 3 /* in arithmetic */
665 static const char S_I_T[][4] = {
666 /* 0 */ { CSPCL, CIGN, CIGN, CIGN }, /* PEOA */
667 /* 1 */ { CSPCL, CWORD, CWORD, CWORD }, /* ' ' */
668 /* 2 */ { CNL, CNL, CNL, CNL }, /* \n */
669 /* 3 */ { CWORD, CCTL, CCTL, CWORD }, /* !*-/:=?[]~ */
670 /* 4 */ { CDQUOTE, CENDQUOTE, CWORD, CDQUOTE }, /* '"' */
671 /* 5 */ { CVAR, CVAR, CWORD, CVAR }, /* $ */
672 /* 6 */ { CSQUOTE, CWORD, CENDQUOTE, CSQUOTE }, /* "'" */
673 /* 7 */ { CSPCL, CWORD, CWORD, CLP }, /* ( */
674 /* 8 */ { CSPCL, CWORD, CWORD, CRP }, /* ) */
675 /* 9 */ { CBACK, CBACK, CCTL, CBACK }, /* \ */
676 /* 10 */ { CBQUOTE, CBQUOTE, CWORD, CBQUOTE }, /* ` */
677 /* 11 */ { CENDVAR, CENDVAR, CWORD, CENDVAR }, /* } */
678 #ifndef USE_SIT_FUNCTION
679 /* 12 */ { CENDFILE, CENDFILE, CENDFILE, CENDFILE }, /* PEOF */
680 /* 13 */ { CWORD, CWORD, CWORD, CWORD }, /* 0-9A-Za-z */
681 /* 14 */ { CCTL, CCTL, CCTL, CCTL } /* CTLESC ... */
685 #ifdef USE_SIT_FUNCTION
687 #define U_C(c) ((unsigned char)(c))
689 static int SIT(int c, int syntax)
691 static const char spec_symbls[]="\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
692 static const char syntax_index_table [] = {
693 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
694 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
695 3, 1, 3, 3, 9, 3,10, 1, /* "=>?[\\]`|" */
700 if(c==PEOF) /* 2^8+2 */
702 if(c==PEOA) /* 2^8+1 */
704 else if(U_C(c)>=U_C(CTLESC) && U_C(c)<=U_C(CTLQUOTEMARK))
707 s = strchr(spec_symbls, c);
710 indx = syntax_index_table[(s-spec_symbls)];
712 return S_I_T[indx][syntax];
715 #else /* USE_SIT_FUNCTION */
717 #define SIT(c, syntax) S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax]
719 #define CSPCL_CIGN_CIGN_CIGN 0
720 #define CSPCL_CWORD_CWORD_CWORD 1
721 #define CNL_CNL_CNL_CNL 2
722 #define CWORD_CCTL_CCTL_CWORD 3
723 #define CDQUOTE_CENDQUOTE_CWORD_CDQUOTE 4
724 #define CVAR_CVAR_CWORD_CVAR 5
725 #define CSQUOTE_CWORD_CENDQUOTE_CSQUOTE 6
726 #define CSPCL_CWORD_CWORD_CLP 7
727 #define CSPCL_CWORD_CWORD_CRP 8
728 #define CBACK_CBACK_CCTL_CBACK 9
729 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
730 #define CENDVAR_CENDVAR_CWORD_CENDVAR 11
731 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
732 #define CWORD_CWORD_CWORD_CWORD 13
733 #define CCTL_CCTL_CCTL_CCTL 14
735 static const char syntax_index_table[258] = {
736 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
737 /* 0 -130 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
738 /* 1 -129 PEOA */ CSPCL_CIGN_CIGN_CIGN,
739 /* 2 -128 0xff */ CWORD_CWORD_CWORD_CWORD,
740 /* 3 -127 */ CCTL_CCTL_CCTL_CCTL, /* CTLQUOTEMARK */
741 /* 4 -126 */ CCTL_CCTL_CCTL_CCTL,
742 /* 5 -125 */ CCTL_CCTL_CCTL_CCTL,
743 /* 6 -124 */ CCTL_CCTL_CCTL_CCTL,
744 /* 7 -123 */ CCTL_CCTL_CCTL_CCTL,
745 /* 8 -122 */ CCTL_CCTL_CCTL_CCTL,
746 /* 9 -121 */ CCTL_CCTL_CCTL_CCTL,
747 /* 10 -120 */ CCTL_CCTL_CCTL_CCTL, /* CTLESC */
748 /* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
749 /* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
750 /* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
751 /* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
752 /* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
753 /* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
754 /* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
755 /* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
756 /* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
757 /* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
758 /* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
759 /* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
760 /* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
761 /* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
762 /* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
763 /* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
764 /* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
765 /* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
766 /* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
767 /* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
768 /* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
769 /* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
770 /* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
771 /* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
772 /* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
773 /* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
774 /* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
775 /* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
776 /* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
777 /* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
778 /* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
779 /* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
780 /* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
781 /* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
782 /* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
783 /* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
784 /* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
785 /* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
786 /* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
787 /* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
788 /* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
789 /* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
790 /* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
791 /* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
792 /* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
793 /* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
794 /* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
795 /* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
796 /* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
797 /* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
798 /* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
799 /* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
800 /* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
801 /* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
802 /* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
803 /* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
804 /* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
805 /* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
806 /* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
807 /* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
808 /* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
809 /* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
810 /* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
811 /* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
812 /* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
813 /* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
814 /* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
815 /* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
816 /* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
817 /* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
818 /* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
819 /* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
820 /* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
821 /* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
822 /* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
823 /* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
824 /* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
825 /* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
826 /* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
827 /* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
828 /* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
829 /* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
830 /* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
831 /* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
832 /* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
833 /* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
834 /* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
835 /* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
836 /* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
837 /* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
838 /* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
839 /* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
840 /* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
841 /* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
842 /* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
843 /* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
844 /* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
845 /* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
846 /* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
847 /* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
848 /* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
849 /* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
850 /* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
851 /* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
852 /* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
853 /* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
854 /* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
855 /* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
856 /* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
857 /* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
858 /* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
859 /* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
860 /* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
861 /* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
862 /* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
863 /* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
864 /* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
865 /* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
866 /* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
867 /* 130 0 */ CWORD_CWORD_CWORD_CWORD,
868 /* 131 1 */ CWORD_CWORD_CWORD_CWORD,
869 /* 132 2 */ CWORD_CWORD_CWORD_CWORD,
870 /* 133 3 */ CWORD_CWORD_CWORD_CWORD,
871 /* 134 4 */ CWORD_CWORD_CWORD_CWORD,
872 /* 135 5 */ CWORD_CWORD_CWORD_CWORD,
873 /* 136 6 */ CWORD_CWORD_CWORD_CWORD,
874 /* 137 7 */ CWORD_CWORD_CWORD_CWORD,
875 /* 138 8 */ CWORD_CWORD_CWORD_CWORD,
876 /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
877 /* 140 10 "\n" */ CNL_CNL_CNL_CNL,
878 /* 141 11 */ CWORD_CWORD_CWORD_CWORD,
879 /* 142 12 */ CWORD_CWORD_CWORD_CWORD,
880 /* 143 13 */ CWORD_CWORD_CWORD_CWORD,
881 /* 144 14 */ CWORD_CWORD_CWORD_CWORD,
882 /* 145 15 */ CWORD_CWORD_CWORD_CWORD,
883 /* 146 16 */ CWORD_CWORD_CWORD_CWORD,
884 /* 147 17 */ CWORD_CWORD_CWORD_CWORD,
885 /* 148 18 */ CWORD_CWORD_CWORD_CWORD,
886 /* 149 19 */ CWORD_CWORD_CWORD_CWORD,
887 /* 150 20 */ CWORD_CWORD_CWORD_CWORD,
888 /* 151 21 */ CWORD_CWORD_CWORD_CWORD,
889 /* 152 22 */ CWORD_CWORD_CWORD_CWORD,
890 /* 153 23 */ CWORD_CWORD_CWORD_CWORD,
891 /* 154 24 */ CWORD_CWORD_CWORD_CWORD,
892 /* 155 25 */ CWORD_CWORD_CWORD_CWORD,
893 /* 156 26 */ CWORD_CWORD_CWORD_CWORD,
894 /* 157 27 */ CWORD_CWORD_CWORD_CWORD,
895 /* 158 28 */ CWORD_CWORD_CWORD_CWORD,
896 /* 159 29 */ CWORD_CWORD_CWORD_CWORD,
897 /* 160 30 */ CWORD_CWORD_CWORD_CWORD,
898 /* 161 31 */ CWORD_CWORD_CWORD_CWORD,
899 /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
900 /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
901 /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CDQUOTE,
902 /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
903 /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
904 /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
905 /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
906 /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CSQUOTE,
907 /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
908 /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
909 /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
910 /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
911 /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
912 /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
913 /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
914 /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
915 /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
916 /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
917 /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
918 /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
919 /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
920 /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
921 /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
922 /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
923 /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
924 /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
925 /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
926 /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
927 /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
928 /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
929 /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
930 /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
931 /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
932 /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
933 /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
934 /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
935 /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
936 /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
937 /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
938 /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
939 /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
940 /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
941 /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
942 /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
943 /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
944 /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
945 /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
946 /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
947 /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
948 /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
949 /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
950 /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
951 /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
952 /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
953 /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
954 /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
955 /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
956 /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
957 /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
958 /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
959 /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
960 /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
961 /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
962 /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
963 /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
964 /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
965 /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
966 /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
967 /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
968 /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
969 /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
970 /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
971 /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
972 /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
973 /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
974 /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
975 /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
976 /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
977 /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
978 /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
979 /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
980 /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
981 /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
982 /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
983 /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
984 /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
985 /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
986 /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
987 /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
988 /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
989 /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
990 /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
991 /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
992 /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
993 /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
994 /* 257 127 */ CWORD_CWORD_CWORD_CWORD,
997 #endif /* USE_SIT_FUNCTION */
1000 /* first char is indicating which tokens mark the end of a list */
1001 static const char *const tokname_array[] = {
1016 #define KWDOFFSET 14
1017 /* the following are keywords */
1036 static const char *tokname(int tok)
1038 static char buf[16];
1042 sprintf(buf+(tok>=TSEMI), "%s%c",
1043 tokname_array[tok]+1, (tok>=TSEMI ? '"' : 0));
1047 static int plinno = 1; /* input line number */
1049 static int parselleft; /* copy of parsefile->lleft */
1051 static struct parsefile basepf; /* top level input file */
1052 static char basebuf[BUFSIZ]; /* buffer for top level input file */
1053 static struct parsefile *parsefile = &basepf; /* current input file */
1056 * NEOF is returned by parsecmd when it encounters an end of file. It
1057 * must be distinct from NULL, so we use the address of a variable that
1058 * happens to be handy.
1061 static int tokpushback; /* last token pushed back */
1062 #define NEOF ((union node *)&tokpushback)
1063 static int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
1066 static void error (const char *, ...) __attribute__((__noreturn__));
1067 static void exerror (int, const char *, ...) __attribute__((__noreturn__));
1068 static void shellexec (char **, char **, const char *, int)
1069 __attribute__((noreturn));
1070 static void exitshell (int) __attribute__((noreturn));
1072 static int goodname(const char *);
1073 static void ignoresig (int);
1074 static void onsig (int);
1075 static void dotrap (void);
1076 static int decode_signal (const char *, int);
1078 static void shprocvar(void);
1079 static void deletefuncs(void);
1080 static void setparam (char **);
1081 static void freeparam (volatile struct shparam *);
1083 static void find_command (const char *, struct cmdentry *, int, const char *);
1085 static inline void hashcd (void);
1087 /* reasons for skipping commands (see comment on breakcmd routine) */
1093 /* values of cmdtype */
1094 #define CMDUNKNOWN -1 /* no entry in table for command */
1095 #define CMDNORMAL 0 /* command is an executable program */
1096 #define CMDBUILTIN 1 /* command is a shell builtin */
1097 #define CMDFUNCTION 2 /* command is a shell function */
1099 #define DO_ERR 1 /* find_command prints errors */
1100 #define DO_ABS 2 /* find_command checks absolute paths */
1101 #define DO_NOFUN 4 /* find_command ignores functions */
1102 #define DO_BRUTE 8 /* find_command ignores hash table */
1109 #define VEXPORT 0x01 /* variable is exported */
1110 #define VREADONLY 0x02 /* variable cannot be modified */
1111 #define VSTRFIXED 0x04 /* variable struct is staticly allocated */
1112 #define VTEXTFIXED 0x08 /* text is staticly allocated */
1113 #define VSTACK 0x10 /* text is allocated on the stack */
1114 #define VUNSET 0x20 /* the variable is not set */
1115 #define VNOFUNC 0x40 /* don't call the callback function */
1119 struct var *next; /* next entry in hash list */
1120 int flags; /* flags are defined above */
1121 char *text; /* name=value */
1122 void (*func) (const char *);
1123 /* function to be called when */
1124 /* the variable gets set/unset */
1128 struct localvar *next; /* next local variable in list */
1129 struct var *vp; /* the variable that was made local */
1130 int flags; /* saved flags */
1131 char *text; /* saved text */
1135 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
1136 #define rmescapes(p) _rmescapes((p), 0)
1137 static char *_rmescapes (char *, int);
1139 static void rmescapes (char *);
1142 static int casematch (union node *, const char *);
1143 static void clearredir(void);
1144 static void popstring(void);
1145 static void readcmdfile (const char *);
1147 static int number (const char *);
1148 static int is_number (const char *, int *num);
1149 static char *single_quote (const char *);
1150 static int nextopt (const char *);
1152 static void redirect (union node *, int);
1153 static void popredir (void);
1154 static int dup_as_newfd (int, int);
1156 static void changepath(const char *newval);
1157 static void getoptsreset(const char *value);
1160 static int parsenleft; /* copy of parsefile->nleft */
1161 static char *parsenextc; /* copy of parsefile->nextc */
1162 static int rootpid; /* pid of main shell */
1163 static int rootshell; /* true if we aren't a child of the main shell */
1165 static const char spcstr[] = " ";
1166 static const char snlfmt[] = "%s\n";
1168 static int sstrnleft;
1169 static int herefd = -1;
1171 static struct localvar *localvars;
1173 static struct var vifs;
1174 static struct var vmail;
1175 static struct var vmpath;
1176 static struct var vpath;
1177 static struct var vps1;
1178 static struct var vps2;
1179 static struct var voptind;
1180 #ifdef CONFIG_LOCALE_SUPPORT
1181 static struct var vlc_all;
1182 static struct var vlc_ctype;
1189 void (*func) (const char *);
1192 static const char defpathvar[] =
1193 "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
1194 #define defpath (defpathvar + 5)
1197 static const char defifsvar[] = "IFS= \t\n";
1198 #define defifs (defifsvar + 4)
1200 static const char defifs[] = " \t\n";
1203 static const struct varinit varinit[] = {
1205 { &vifs, VSTRFIXED|VTEXTFIXED, defifsvar,
1207 { &vifs, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS=",
1210 { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=",
1212 { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=",
1214 { &vpath, VSTRFIXED|VTEXTFIXED, defpathvar,
1216 #if defined(CONFIG_FEATURE_COMMAND_EDITING) && defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
1217 { &vps1, VSTRFIXED|VTEXTFIXED, "PS1=\\w \\$ ",
1219 #endif /* else vps1 depends on uid */
1220 { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ",
1222 { &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1",
1224 #ifdef CONFIG_LOCALE_SUPPORT
1225 { &vlc_all, VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL=",
1227 { &vlc_ctype, VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE=",
1236 static struct var *vartab[VTABSIZE];
1239 * The following macros access the values of the above variables.
1240 * They have to skip over the name. They return the null string
1241 * for unset variables.
1244 #define ifsval() (vifs.text + 4)
1245 #define ifsset() ((vifs.flags & VUNSET) == 0)
1246 #define mailval() (vmail.text + 5)
1247 #define mpathval() (vmpath.text + 9)
1248 #define pathval() (vpath.text + 5)
1249 #define ps1val() (vps1.text + 4)
1250 #define ps2val() (vps2.text + 4)
1251 #define optindval() (voptind.text + 7)
1253 #define mpathset() ((vmpath.flags & VUNSET) == 0)
1255 static void initvar (void);
1256 static void setvar (const char *, const char *, int);
1257 static void setvareq (char *, int);
1258 static void listsetvar (struct strlist *);
1259 static const char *lookupvar (const char *);
1260 static const char *bltinlookup (const char *);
1261 static char **environment (void);
1262 static int showvarscmd (int, char **);
1263 static void mklocal (char *);
1264 static void poplocalvars (void);
1265 static int unsetvar (const char *);
1266 static int varequal (const char *, const char *);
1269 static char *arg0; /* value of $0 */
1270 static struct shparam shellparam; /* current positional parameters */
1271 static char **argptr; /* argument list for builtin commands */
1272 static char *optionarg; /* set by nextopt (like getopt) */
1273 static char *optptr; /* used by nextopt */
1274 static char *minusc; /* argument to -c option */
1277 #ifdef CONFIG_ASH_ALIAS
1279 #define ALIASINUSE 1
1291 static struct alias *atab[ATABSIZE];
1293 static void setalias (char *, char *);
1294 static struct alias **hashalias (const char *);
1295 static struct alias *freealias (struct alias *);
1296 static struct alias **__lookupalias (const char *);
1299 setalias(char *name, char *val)
1301 struct alias *ap, **app;
1303 app = __lookupalias(name);
1307 if (!(ap->flag & ALIASINUSE)) {
1310 ap->val = xstrdup(val);
1311 ap->flag &= ~ALIASDEAD;
1314 ap = xmalloc(sizeof (struct alias));
1315 ap->name = xstrdup(name);
1316 ap->val = xstrdup(val);
1329 app = __lookupalias(name);
1333 *app = freealias(*app);
1344 struct alias *ap, **app;
1348 for (i = 0; i < ATABSIZE; i++) {
1350 for (ap = *app; ap; ap = *app) {
1351 *app = freealias(*app);
1361 printalias(const struct alias *ap) {
1364 p = single_quote(ap->val);
1365 printf("alias %s=%s\n", ap->name, p);
1371 * TODO - sort output
1374 aliascmd(int argc, char **argv)
1383 for (i = 0; i < ATABSIZE; i++)
1384 for (ap = atab[i]; ap; ap = ap->next) {
1389 while ((n = *++argv) != NULL) {
1390 if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */
1391 if ((ap = *__lookupalias(n)) == NULL) {
1392 out2fmt("%s: %s not found\n", "alias", n);
1407 unaliascmd(int argc, char **argv)
1411 while ((i = nextopt("a")) != '\0') {
1417 for (i = 0; *argptr; argptr++) {
1418 if (unalias(*argptr)) {
1419 out2fmt("%s: %s not found\n", "unalias", *argptr);
1427 static struct alias **
1428 hashalias(const char *p)
1430 unsigned int hashval;
1435 return &atab[hashval % ATABSIZE];
1438 static struct alias *
1439 freealias(struct alias *ap)
1443 if (ap->flag & ALIASINUSE) {
1444 ap->flag |= ALIASDEAD;
1456 static struct alias **
1457 __lookupalias(const char *name)
1459 struct alias **app = hashalias(name);
1461 for (; *app; app = &(*app)->next) {
1462 if (equal(name, (*app)->name)) {
1471 #ifdef CONFIG_ASH_MATH_SUPPORT
1472 /* The generated file arith.c has been replaced with a custom hand
1473 * written implementation written by Aaron Lehmann <aaronl@vitelus.com>.
1474 * This is now part of libbb, so that it can be used by all the shells
1476 static void expari (int);
1479 static char *trap[NSIG]; /* trap handler commands */
1480 static char sigmode[NSIG - 1]; /* current value of signal */
1481 static char gotsig[NSIG - 1]; /* indicates specified signal received */
1482 static int pendingsigs; /* indicates some signal received */
1485 * This file was generated by the mkbuiltins program.
1488 #ifdef CONFIG_ASH_JOB_CONTROL
1489 static int bgcmd (int, char **);
1490 static int fgcmd (int, char **);
1491 static int killcmd (int, char **);
1493 static int bltincmd (int, char **);
1494 static int cdcmd (int, char **);
1495 static int breakcmd (int, char **);
1496 #ifdef CONFIG_ASH_CMDCMD
1497 static int commandcmd (int, char **);
1499 static int dotcmd (int, char **);
1500 static int evalcmd (int, char **);
1501 static int execcmd (int, char **);
1502 static int exitcmd (int, char **);
1503 static int exportcmd (int, char **);
1504 static int histcmd (int, char **);
1505 static int hashcmd (int, char **);
1506 static int helpcmd (int, char **);
1507 static int jobscmd (int, char **);
1508 static int localcmd (int, char **);
1509 static int pwdcmd (int, char **);
1510 static int readcmd (int, char **);
1511 static int returncmd (int, char **);
1512 static int setcmd (int, char **);
1513 static int setvarcmd (int, char **);
1514 static int shiftcmd (int, char **);
1515 static int trapcmd (int, char **);
1516 static int umaskcmd (int, char **);
1517 #ifdef CONFIG_ASH_ALIAS
1518 static int aliascmd (int, char **);
1519 static int unaliascmd (int, char **);
1521 static int unsetcmd (int, char **);
1522 static int waitcmd (int, char **);
1523 static int ulimitcmd (int, char **);
1524 static int timescmd (int, char **);
1525 #ifdef CONFIG_ASH_MATH_SUPPORT
1526 static int letcmd (int, char **);
1528 static int typecmd (int, char **);
1529 #ifdef CONFIG_ASH_GETOPTS
1530 static int getoptscmd (int, char **);
1534 static int true_main (int, char **);
1536 #ifndef CONFIG_FALSE
1537 static int false_main (int, char **);
1540 static void setpwd (const char *, int);
1543 #define BUILTIN_NOSPEC "0"
1544 #define BUILTIN_SPECIAL "1"
1545 #define BUILTIN_REGULAR "2"
1546 #define BUILTIN_ASSIGN "4"
1547 #define BUILTIN_SPEC_ASSG "5"
1548 #define BUILTIN_REG_ASSG "6"
1550 #define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1)
1551 #define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2)
1552 #define IS_BUILTIN_ASSIGN(builtincmd) ((builtincmd)->name[0] & 4)
1556 int (*const builtinfunc) (int, char **);
1561 /* It is CRUCIAL that this listing be kept in ascii order, otherwise
1562 * the binary search in find_builtin() will stop working. If you value
1563 * your kneecaps, you'll be sure to *make sure* that any changes made
1564 * to this array result in the listing remaining in ascii order. You
1567 static const struct builtincmd builtincmds[] = {
1568 { BUILTIN_SPECIAL ".", dotcmd }, /* first, see declare DOTCMD */
1569 { BUILTIN_SPECIAL ":", true_main },
1570 #ifdef CONFIG_ASH_ALIAS
1571 { BUILTIN_REG_ASSG "alias", aliascmd },
1573 #ifdef CONFIG_ASH_JOB_CONTROL
1574 { BUILTIN_REGULAR "bg", bgcmd },
1576 { BUILTIN_SPECIAL "break", breakcmd },
1577 { BUILTIN_SPECIAL "builtin", bltincmd },
1578 { BUILTIN_REGULAR "cd", cdcmd },
1579 { BUILTIN_NOSPEC "chdir", cdcmd },
1580 #ifdef CONFIG_ASH_CMDCMD
1581 { BUILTIN_REGULAR "command", commandcmd },
1583 { BUILTIN_SPECIAL "continue", breakcmd },
1584 { BUILTIN_SPECIAL "eval", evalcmd },
1585 { BUILTIN_SPECIAL "exec", execcmd },
1586 { BUILTIN_SPECIAL "exit", exitcmd },
1587 { BUILTIN_SPEC_ASSG "export", exportcmd },
1588 { BUILTIN_REGULAR "false", false_main },
1589 { BUILTIN_REGULAR "fc", histcmd },
1590 #ifdef CONFIG_ASH_JOB_CONTROL
1591 { BUILTIN_REGULAR "fg", fgcmd },
1593 #ifdef CONFIG_ASH_GETOPTS
1594 { BUILTIN_REGULAR "getopts", getoptscmd },
1596 { BUILTIN_NOSPEC "hash", hashcmd },
1597 { BUILTIN_NOSPEC "help", helpcmd },
1598 { BUILTIN_REGULAR "jobs", jobscmd },
1599 #ifdef CONFIG_ASH_JOB_CONTROL
1600 { BUILTIN_REGULAR "kill", killcmd },
1602 #ifdef CONFIG_ASH_MATH_SUPPORT
1603 { BUILTIN_REGULAR "let", letcmd },
1605 { BUILTIN_ASSIGN "local", localcmd },
1606 { BUILTIN_NOSPEC "pwd", pwdcmd },
1607 { BUILTIN_REGULAR "read", readcmd },
1608 { BUILTIN_SPEC_ASSG "readonly", exportcmd },
1609 { BUILTIN_SPECIAL "return", returncmd },
1610 { BUILTIN_SPECIAL "set", setcmd },
1611 { BUILTIN_NOSPEC "setvar", setvarcmd },
1612 { BUILTIN_SPECIAL "shift", shiftcmd },
1613 { BUILTIN_SPECIAL "times", timescmd },
1614 { BUILTIN_SPECIAL "trap", trapcmd },
1615 { BUILTIN_REGULAR "true", true_main },
1616 { BUILTIN_NOSPEC "type", typecmd },
1617 { BUILTIN_NOSPEC "ulimit", ulimitcmd },
1618 { BUILTIN_REGULAR "umask", umaskcmd },
1619 #ifdef CONFIG_ASH_ALIAS
1620 { BUILTIN_REGULAR "unalias", unaliascmd },
1622 { BUILTIN_SPECIAL "unset", unsetcmd },
1623 { BUILTIN_REGULAR "wait", waitcmd },
1625 #define NUMBUILTINS (sizeof (builtincmds) / sizeof (struct builtincmd) )
1627 #define DOTCMD &builtincmds[0]
1628 static struct builtincmd *BLTINCMD;
1629 static struct builtincmd *EXECCMD;
1630 static struct builtincmd *EVALCMD;
1633 #define CONFIG_ASH_JOB_CONTROLTOPPED 1 /* all procs are stopped */
1634 #define JOBDONE 2 /* all procs are completed */
1637 * A job structure contains information about a job. A job is either a
1638 * single process or a set of processes contained in a pipeline. In the
1639 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
1644 pid_t pid; /* process id */
1645 int status; /* status flags (defined above) */
1646 char *cmd; /* text of command being run */
1650 static int job_warning; /* user was warned about stopped jobs */
1652 #ifdef CONFIG_ASH_JOB_CONTROL
1653 static void setjobctl(int enable);
1655 #define setjobctl(on) /* do nothing */
1660 struct procstat ps0; /* status of process */
1661 struct procstat *ps; /* status or processes when more than one */
1662 short nprocs; /* number of processes */
1663 short pgrp; /* process group of this job */
1664 char state; /* true if job is finished */
1665 char used; /* true if this entry is in used */
1666 char changed; /* true if status has changed */
1667 #ifdef CONFIG_ASH_JOB_CONTROL
1668 char jobctl; /* job running under job control */
1672 static struct job *jobtab; /* array of jobs */
1673 static int njobs; /* size of array */
1674 static int backgndpid = -1; /* pid of last background process */
1675 #ifdef CONFIG_ASH_JOB_CONTROL
1676 static int initialpgrp; /* pgrp of shell on invocation */
1677 static int curjob; /* current job */
1680 static int intreceived;
1682 static struct job *makejob (const union node *, int);
1683 static int forkshell (struct job *, const union node *, int);
1684 static int waitforjob (struct job *);
1686 static int docd (char *, int);
1687 static void getpwd (void);
1689 static char *padvance (const char **, const char *);
1691 static char nullstr[1]; /* zero length string */
1692 static char *curdir = nullstr; /* current working directory */
1695 cdcmd(int argc, char **argv)
1704 if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME")) == NULL)
1705 error("HOME not set");
1708 if (dest[0] == '-' && dest[1] == '\0') {
1709 dest = bltinlookup("OLDPWD");
1710 if (!dest || !*dest) {
1719 if (*dest == '/' || (path = bltinlookup("CDPATH")) == NULL)
1721 while ((p = padvance(&path, dest)) != NULL) {
1722 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
1727 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
1729 print = strcmp(p, dest);
1731 if (docd(p, print) >= 0)
1736 error("can't cd to %s", dest);
1742 * Actually do the chdir. In an interactive shell, print the
1743 * directory name if "print" is nonzero.
1747 docd(char *dest, int print)
1749 TRACE(("docd(\"%s\", %d) called\n", dest, print));
1751 if (chdir(dest) < 0) {
1757 * Update curdir (the name of the current directory) in response to a
1758 * cd command. We also call hashcd to let the routines in exec.c know
1759 * that the current directory has changed.
1761 /* If dest is NULL, we don't know the current directory */
1762 if (dest == NULL || curdir == nullstr)
1775 pwdcmd(int argc, char **argv)
1781 /* Ask system the current directory */
1785 curdir = xgetcwd(0);
1791 setpwd(const char *val, int setold)
1796 setvar("OLDPWD", curdir, VEXPORT);
1799 if (curdir != nullstr) {
1800 if(val!=NULL && *val != '/')
1801 val = cated = concat_path_file(curdir, val);
1807 curdir = simplify_path(val);
1810 setvar("PWD", curdir, VEXPORT);
1814 * Errors and exceptions.
1818 * Code to handle exceptions in C.
1822 * We enclose jmp_buf in a structure so that we can declare pointers to
1823 * jump locations. The global variable handler contains the location to
1824 * jump to when an exception occurs, and the global variable exception
1825 * contains a code identifying the exeception. To implement nested
1826 * exception handlers, the user should save the value of handler on entry
1827 * to an inner scope, set handler to point to a jmploc structure for the
1828 * inner scope, and restore handler on exit from the scope.
1836 #define EXINT 0 /* SIGINT received */
1837 #define EXERROR 1 /* a generic error */
1838 #define EXSHELLPROC 2 /* execute a shell procedure */
1839 #define EXEXEC 3 /* command execution failed */
1841 static struct jmploc *handler;
1842 static int exception;
1844 static void exverror (int, const char *, va_list)
1845 __attribute__((__noreturn__));
1848 * Called to raise an exception. Since C doesn't include exceptions, we
1849 * just do a longjmp to the exception handler. The type of exception is
1850 * stored in the global variable "exception".
1853 static void exraise (int) __attribute__((__noreturn__));
1859 if (handler == NULL)
1864 longjmp(handler->loc, 1);
1869 * Called from trap.c when a SIGINT is received. (If the user specifies
1870 * that SIGINT is to be trapped or ignored using the trap builtin, then
1871 * this routine is not called.) Suppressint is nonzero when interrupts
1872 * are held using the INTOFF macro. The call to _exit is necessary because
1873 * there is a short period after a fork before the signal handlers are
1874 * set to the appropriate value for the child. (The test for iflag is
1875 * just defensive programming.)
1887 sigemptyset(&mysigset);
1888 sigprocmask(SIG_SETMASK, &mysigset, NULL);
1889 if (rootshell && iflag)
1892 signal(SIGINT, SIG_DFL);
1899 static char *commandname; /* currently executing command */
1902 * Exverror is called to raise the error exception. If the first argument
1903 * is not NULL then error prints an error message using printf style
1904 * formatting. It then raises the error exception.
1907 exverror(int cond, const char *msg, va_list ap)
1914 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
1916 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
1920 out2fmt("%s: ", commandname);
1921 vfprintf(stderr, msg, ap);
1930 error(const char *msg, ...)
1934 exverror(EXERROR, msg, ap);
1941 exerror(int cond, const char *msg, ...)
1945 exverror(cond, msg, ap);
1953 * Table of error messages.
1957 short errcode; /* error number */
1958 short action; /* operation which encountered the error */
1962 * Types of operations (passed to the errmsg routine).
1965 #define E_OPEN 01 /* opening a file */
1966 #define E_CREAT 02 /* creating a file */
1967 #define E_EXEC 04 /* executing a program */
1969 #define ALL (E_OPEN|E_CREAT|E_EXEC)
1971 static const struct errname errormsg[] = {
1976 { ENOENT, E_CREAT },
1978 { ENOTDIR, E_OPEN },
1979 { ENOTDIR, E_CREAT },
1980 { ENOTDIR, E_EXEC },
1982 { EEXIST, E_CREAT },
2021 { ELIBACC, E_EXEC },
2025 #define ERRNAME_SIZE (sizeof(errormsg)/sizeof(struct errname))
2028 * Return a string describing an error. The returned string may be a
2029 * pointer to a static buffer that will be overwritten on the next call.
2030 * Action describes the operation that got the error.
2034 errmsg(int e, int action)
2036 struct errname const *ep;
2037 static char buf[12];
2039 for (ep = errormsg ; ep < errormsg+ERRNAME_SIZE; ep++) {
2040 if (ep->errcode == e && (ep->action & action) != 0)
2044 snprintf(buf, sizeof buf, "error %d", e);
2049 #ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
2052 if (--suppressint == 0 && intpending) {
2056 static void forceinton (void) {
2063 /* flags in argument to evaltree */
2064 #define EV_EXIT 01 /* exit after evaluating tree */
2065 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
2066 #define EV_BACKCMD 04 /* command executing within back quotes */
2068 static int evalskip; /* set if we are skipping commands */
2069 static int skipcount; /* number of levels to skip */
2070 static int loopnest; /* current loop nesting level */
2071 static int funcnest; /* depth of function calls */
2074 static struct strlist *cmdenviron; /* environment for builtin command */
2075 static int exitstatus; /* exit status of last command */
2076 static int oexitstatus; /* saved exit status */
2078 static void evalsubshell (const union node *, int);
2079 static void expredir (union node *);
2080 static void eprintlist (struct strlist *);
2082 static union node *parsecmd(int);
2084 * Called to reset things after an exception.
2088 * The eval commmand.
2090 static void evalstring (char *, int);
2093 evalcmd(int argc, char **argv)
2102 STARTSTACKSTR(concat);
2106 STPUTC(*p++, concat);
2107 if ((p = *ap++) == NULL)
2109 STPUTC(' ', concat);
2111 STPUTC('\0', concat);
2112 p = grabstackstr(concat);
2114 evalstring(p, EV_TESTED);
2120 * Execute a command or commands contained in a string.
2123 static void evaltree (union node *, int);
2124 static void setinputstring (char *);
2125 static void popfile (void);
2126 static void setstackmark(struct stackmark *mark);
2127 static void popstackmark(struct stackmark *mark);
2131 evalstring(char *s, int flag)
2134 struct stackmark smark;
2136 setstackmark(&smark);
2138 while ((n = parsecmd(0)) != NEOF) {
2140 popstackmark(&smark);
2143 popstackmark(&smark);
2146 static struct builtincmd *find_builtin (const char *);
2147 static void expandarg (union node *, struct arglist *, int);
2148 static void calcsize (const union node *);
2149 static union node *copynode (const union node *);
2152 * Make a copy of a parse tree.
2155 static int funcblocksize; /* size of structures in function */
2156 static int funcstringsize; /* size of strings in node */
2157 static pointer funcblock; /* block to allocate function from */
2158 static char *funcstring; /* block to allocate strings from */
2161 static inline union node *
2162 copyfunc(union node *n)
2169 funcblock = xmalloc(funcblocksize + funcstringsize);
2170 funcstring = (char *) funcblock + funcblocksize;
2175 * Free a parse tree.
2179 freefunc(union node *n)
2187 * Add a new command entry, replacing any existing command entry for
2192 addcmdentry(char *name, struct cmdentry *entry)
2194 struct tblentry *cmdp;
2197 cmdp = cmdlookup(name, 1);
2198 if (cmdp->cmdtype == CMDFUNCTION) {
2199 freefunc(cmdp->param.func);
2201 cmdp->cmdtype = entry->cmdtype;
2202 cmdp->param = entry->u;
2207 evalloop(const union node *n, int flags)
2214 evaltree(n->nbinary.ch1, EV_TESTED);
2216 skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
2220 if (evalskip == SKIPBREAK && --skipcount <= 0)
2224 if (n->type == NWHILE) {
2225 if (exitstatus != 0)
2228 if (exitstatus == 0)
2231 evaltree(n->nbinary.ch2, flags & EV_TESTED);
2232 status = exitstatus;
2237 exitstatus = status;
2241 evalfor(const union node *n, int flags)
2243 struct arglist arglist;
2246 struct stackmark smark;
2248 setstackmark(&smark);
2249 arglist.lastp = &arglist.list;
2250 for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
2251 oexitstatus = exitstatus;
2252 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
2256 *arglist.lastp = NULL;
2260 for (sp = arglist.list ; sp ; sp = sp->next) {
2261 setvar(n->nfor.var, sp->text, 0);
2262 evaltree(n->nfor.body, flags & EV_TESTED);
2264 if (evalskip == SKIPCONT && --skipcount <= 0) {
2268 if (evalskip == SKIPBREAK && --skipcount <= 0)
2275 popstackmark(&smark);
2279 evalcase(const union node *n, int flags)
2283 struct arglist arglist;
2284 struct stackmark smark;
2286 setstackmark(&smark);
2287 arglist.lastp = &arglist.list;
2288 oexitstatus = exitstatus;
2289 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
2290 for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
2291 for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {
2292 if (casematch(patp, arglist.list->text)) {
2293 if (evalskip == 0) {
2294 evaltree(cp->nclist.body, flags);
2301 popstackmark(&smark);
2305 * Evaluate a pipeline. All the processes in the pipeline are children
2306 * of the process creating the pipeline. (This differs from some versions
2307 * of the shell, which make the last process in a pipeline the parent
2311 static inline void evalpipe(union node *n)
2314 struct nodelist *lp;
2319 TRACE(("evalpipe(0x%lx) called\n", (long)n));
2321 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
2324 jp = makejob(n, pipelen);
2326 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
2328 * Search for a command. This is called before we fork so that the
2329 * location of the command will be available in the parent as well as
2330 * the child. The check for "goodname" is an overly conservative
2331 * check that the name will not be subject to expansion.
2334 struct cmdentry entry;
2335 union node *lpn = lp->n;
2336 if (lpn->type == NCMD && lpn->ncmd.args && goodname(lpn->ncmd.args->narg.text))
2337 find_command(lpn->ncmd.args->narg.text, &entry, 0, pathval());
2341 if (pipe(pip) < 0) {
2343 error("Pipe call failed");
2346 if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
2350 dup_as_newfd(prevfd, 0);
2362 dup_as_newfd(pip[1], 1);
2366 evaltree(lp->n, EV_EXIT);
2374 if (n->npipe.backgnd == 0) {
2376 exitstatus = waitforjob(jp);
2377 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
2383 isassignment(const char *word) {
2384 if (!is_name(*word)) {
2389 } while (is_in_name(*word));
2390 return *word == '=';
2395 evalcommand(union node *cmd, int flags)
2397 struct stackmark smark;
2399 struct arglist arglist;
2400 struct arglist varlist;
2406 struct cmdentry cmdentry;
2408 char *volatile savecmdname;
2409 volatile struct shparam saveparam;
2410 struct localvar *volatile savelocalvars;
2414 const struct builtincmd *firstbltin;
2415 struct jmploc *volatile savehandler;
2416 struct jmploc jmploc;
2418 /* Avoid longjmp clobbering */
2425 /* First expand the arguments. */
2426 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
2427 setstackmark(&smark);
2428 arglist.lastp = &arglist.list;
2429 varlist.lastp = &varlist.list;
2431 oexitstatus = exitstatus;
2434 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
2435 expandarg(argp, &varlist, EXP_VARTILDE);
2438 argp = cmd->ncmd.args; argp && !arglist.list;
2439 argp = argp->narg.next
2441 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
2444 struct builtincmd *bcmd;
2446 bcmd = find_builtin(arglist.list->text);
2447 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
2448 for (; argp; argp = argp->narg.next) {
2449 if (pseudovarflag && isassignment(argp->narg.text)) {
2450 expandarg(argp, &arglist, EXP_VARTILDE);
2453 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
2456 *arglist.lastp = NULL;
2457 *varlist.lastp = NULL;
2458 expredir(cmd->ncmd.redirect);
2460 for (sp = arglist.list ; sp ; sp = sp->next)
2462 argv = stalloc(sizeof (char *) * (argc + 1));
2464 for (sp = arglist.list ; sp ; sp = sp->next) {
2465 TRACE(("evalcommand arg: %s\n", sp->text));
2470 if (iflag && funcnest == 0 && argc > 0)
2474 /* Print the command if xflag is set. */
2477 eprintlist(varlist.list);
2478 eprintlist(arglist.list);
2482 /* Now locate the command. */
2484 cmdentry.cmdtype = CMDBUILTIN;
2485 firstbltin = cmdentry.u.cmd = BLTINCMD;
2487 const char *oldpath;
2488 int findflag = DO_ERR;
2492 * Modify the command lookup path, if a PATH= assignment
2495 for (sp = varlist.list ; sp ; sp = sp->next)
2496 if (varequal(sp->text, defpathvar)) {
2497 path = sp->text + 5;
2498 findflag |= DO_BRUTE;
2501 oldfindflag = findflag;
2504 find_command(argv[0], &cmdentry, findflag, path);
2505 if (cmdentry.cmdtype == CMDUNKNOWN) { /* command not found */
2509 /* implement bltin and command here */
2510 if (cmdentry.cmdtype != CMDBUILTIN) {
2514 firstbltin = cmdentry.u.cmd;
2516 if (cmdentry.u.cmd == BLTINCMD) {
2518 struct builtincmd *bcmd;
2523 if (!(bcmd = find_builtin(*argv))) {
2524 out2fmt("%s: not found\n", *argv);
2528 cmdentry.u.cmd = bcmd;
2529 if (bcmd != BLTINCMD)
2533 if (cmdentry.u.cmd == find_builtin("command")) {
2538 if (*argv[0] == '-') {
2539 if (!equal(argv[0], "-p")) {
2549 findflag |= DO_BRUTE;
2552 findflag = oldfindflag;
2554 findflag |= DO_NOFUN;
2562 /* Fork off a child process if necessary. */
2563 if (cmd->ncmd.backgnd
2564 || (cmdentry.cmdtype == CMDNORMAL && (flags & EV_EXIT) == 0)
2566 jp = makejob(cmd, 1);
2567 mode = cmd->ncmd.backgnd;
2568 if (forkshell(jp, cmd, mode) != 0)
2569 goto parent; /* at end of routine */
2573 /* This is the child process if a fork occurred. */
2574 /* Execute the command. */
2575 if (cmdentry.cmdtype == CMDFUNCTION) {
2577 trputs("Shell function: "); trargs(argv);
2579 exitstatus = oexitstatus;
2580 redirect(cmd->ncmd.redirect, REDIR_PUSH);
2581 saveparam = shellparam;
2582 shellparam.malloc = 0;
2583 shellparam.nparam = argc - 1;
2584 shellparam.p = argv + 1;
2586 savelocalvars = localvars;
2589 if (setjmp(jmploc.loc)) {
2590 if (exception == EXSHELLPROC) {
2591 freeparam((volatile struct shparam *)
2594 saveparam.optind = shellparam.optind;
2595 saveparam.optoff = shellparam.optoff;
2596 freeparam(&shellparam);
2597 shellparam = saveparam;
2600 localvars = savelocalvars;
2601 handler = savehandler;
2602 longjmp(handler->loc, 1);
2604 savehandler = handler;
2606 for (sp = varlist.list ; sp ; sp = sp->next)
2609 evaltree(cmdentry.u.func, flags & EV_TESTED);
2613 localvars = savelocalvars;
2614 saveparam.optind = shellparam.optind;
2615 saveparam.optoff = shellparam.optoff;
2616 freeparam(&shellparam);
2617 shellparam = saveparam;
2618 handler = savehandler;
2621 if (evalskip == SKIPFUNC) {
2625 if (flags & EV_EXIT)
2626 exitshell(exitstatus);
2627 } else if (cmdentry.cmdtype == CMDBUILTIN) {
2629 trputs("builtin command: "); trargs(argv);
2631 mode = (cmdentry.u.cmd == EXECCMD)? 0 : REDIR_PUSH;
2632 redirect(cmd->ncmd.redirect, mode);
2633 savecmdname = commandname;
2634 if (IS_BUILTIN_SPECIAL(firstbltin)) {
2635 listsetvar(varlist.list);
2637 cmdenviron = varlist.list;
2640 if (setjmp(jmploc.loc)) {
2642 exitstatus = (e == EXINT)? SIGINT+128 : 2;
2645 savehandler = handler;
2647 commandname = argv[0];
2649 optptr = NULL; /* initialize nextopt */
2650 exitstatus = (*cmdentry.u.cmd->builtinfunc)(argc, argv);
2654 if (e != EXSHELLPROC) {
2655 commandname = savecmdname;
2656 if (flags & EV_EXIT)
2657 exitshell(exitstatus);
2659 handler = savehandler;
2661 if ((e != EXERROR && e != EXEXEC)
2662 || cmdentry.u.cmd == BLTINCMD
2663 || cmdentry.u.cmd == DOTCMD
2664 || cmdentry.u.cmd == EVALCMD
2665 || cmdentry.u.cmd == EXECCMD)
2669 if (cmdentry.u.cmd != EXECCMD)
2673 trputs("normal command: "); trargs(argv);
2675 redirect(cmd->ncmd.redirect, 0);
2677 for (sp = varlist.list ; sp ; sp = sp->next)
2678 setvareq(sp->text, VEXPORT|VSTACK);
2679 envp = environment();
2680 shellexec(argv, envp, path, cmdentry.u.index);
2684 parent: /* parent process gets here (if we forked) */
2685 if (mode == 0) { /* argument to fork */
2687 exitstatus = waitforjob(jp);
2693 setvar("_", lastarg, 0);
2694 popstackmark(&smark);
2698 * Evaluate a parse tree. The value is left in the global variable
2702 evaltree(union node *n, int flags)
2706 TRACE(("evaltree(NULL) called\n"));
2709 TRACE(("evaltree(0x%lx: %d) called\n", (long)n, n->type));
2712 evaltree(n->nbinary.ch1, flags & EV_TESTED);
2715 evaltree(n->nbinary.ch2, flags);
2718 evaltree(n->nbinary.ch1, EV_TESTED);
2719 if (evalskip || exitstatus != 0)
2721 evaltree(n->nbinary.ch2, flags);
2724 evaltree(n->nbinary.ch1, EV_TESTED);
2725 if (evalskip || exitstatus == 0)
2727 evaltree(n->nbinary.ch2, flags);
2730 expredir(n->nredir.redirect);
2731 redirect(n->nredir.redirect, REDIR_PUSH);
2732 evaltree(n->nredir.n, flags);
2736 evalsubshell(n, flags);
2739 evalsubshell(n, flags);
2742 evaltree(n->nif.test, EV_TESTED);
2745 if (exitstatus == 0)
2746 evaltree(n->nif.ifpart, flags);
2747 else if (n->nif.elsepart)
2748 evaltree(n->nif.elsepart, flags);
2764 struct builtincmd *bcmd;
2765 struct cmdentry entry;
2767 (bcmd = find_builtin(n->narg.text)) &&
2768 IS_BUILTIN_SPECIAL(bcmd)
2770 out2fmt("%s is a special built-in\n", n->narg.text);
2774 entry.cmdtype = CMDFUNCTION;
2775 entry.u.func = copyfunc(n->narg.next);
2776 addcmdentry(n->narg.text, &entry);
2781 evaltree(n->nnot.com, EV_TESTED);
2782 exitstatus = !exitstatus;
2790 evalcommand(n, flags);
2795 printf("Node type = %d\n", n->type);
2804 (checkexit && eflag && exitstatus && !(flags & EV_TESTED))
2806 exitshell(exitstatus);
2810 * Kick off a subshell to evaluate a tree.
2814 evalsubshell(const union node *n, int flags)
2817 int backgnd = (n->type == NBACKGND);
2819 expredir(n->nredir.redirect);
2821 if (forkshell(jp, n, backgnd) == 0) {
2823 flags &=~ EV_TESTED;
2824 redirect(n->nredir.redirect, 0);
2825 evaltree(n->nredir.n, flags | EV_EXIT); /* never returns */
2829 exitstatus = waitforjob(jp);
2835 * Compute the names of the files in a redirection list.
2838 static void fixredir(union node *n, const char *text, int err);
2841 expredir(union node *n)
2845 for (redir = n ; redir ; redir = redir->nfile.next) {
2847 fn.lastp = &fn.list;
2848 oexitstatus = exitstatus;
2849 switch (redir->type) {
2855 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
2856 redir->nfile.expfname = fn.list->text;
2860 if (redir->ndup.vname) {
2861 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
2862 fixredir(redir, fn.list->text, 1);
2871 * Execute a command inside back quotes. If it's a builtin command, we
2872 * want to save its output in a block obtained from malloc. Otherwise
2873 * we fork off a subprocess and get the output of the command via a pipe.
2874 * Should be called with interrupts off.
2878 evalbackcmd(union node *n, struct backcmd *result)
2882 struct stackmark smark; /* unnecessary */
2884 setstackmark(&smark);
2895 error("Pipe call failed");
2897 if (forkshell(jp, n, FORK_NOJOB) == 0) {
2902 dup_as_newfd(pip[1], 1);
2906 evaltree(n, EV_EXIT);
2909 result->fd = pip[0];
2912 popstackmark(&smark);
2913 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
2914 result->fd, result->buf, result->nleft, result->jp));
2919 * Execute a simple command.
2924 * Builtin commands. Builtin commands whose functions are closely
2925 * tied to evaluation are implemented here.
2929 * No command given, or a bltin command with no arguments. Set the
2930 * specified variables.
2934 bltincmd(int argc, char **argv)
2937 * Preserve exitstatus of a previous possible redirection
2945 * Handle break and continue commands. Break, continue, and return are
2946 * all handled by setting the evalskip flag. The evaluation routines
2947 * above all check this flag, and if it is set they start skipping
2948 * commands rather than executing them. The variable skipcount is
2949 * the number of loops to break/continue, or the number of function
2950 * levels to return. (The latter is always 1.) It should probably
2951 * be an error to break out of more loops than exist, but it isn't
2952 * in the standard shell so we don't make it one here.
2956 breakcmd(int argc, char **argv)
2958 int n = argc > 1 ? number(argv[1]) : 1;
2961 error("Illegal number: %s", argv[1]);
2965 evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
2973 * The return command.
2977 returncmd(int argc, char **argv)
2979 int ret = argc > 1 ? number(argv[1]) : oexitstatus;
2982 evalskip = SKIPFUNC;
2987 /* Do what ksh does; skip the rest of the file */
2988 evalskip = SKIPFILE;
2995 #ifndef CONFIG_FALSE
2997 false_main(int argc, char **argv)
3005 true_main(int argc, char **argv)
3012 * Controls whether the shell is interactive or not.
3015 static void setsignal(int signo);
3017 #ifdef CONFIG_ASH_MAIL
3018 static void chkmail(int silent);
3022 setinteractive(int on)
3024 static int is_interactive;
3025 static int do_banner=0;
3027 if (on == is_interactive)
3032 #ifdef CONFIG_ASH_MAIL
3035 is_interactive = on;
3036 if (do_banner==0 && is_interactive) {
3037 /* Looks like they want an interactive shell */
3038 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3039 printf( "\n\n" BB_BANNER " Built-in shell (ash)\n");
3040 printf( "Enter 'help' for a list of built-in commands.\n\n");
3049 setinteractive(iflag);
3055 execcmd(int argc, char **argv)
3060 iflag = 0; /* exit on error */
3063 for (sp = cmdenviron; sp ; sp = sp->next)
3064 setvareq(sp->text, VEXPORT|VSTACK);
3065 shellexec(argv + 1, environment(), pathval(), 0);
3071 eprintlist(struct strlist *sp)
3073 for (; sp; sp = sp->next) {
3074 out2fmt(" %s",sp->text);
3079 * Exec a program. Never returns. If you change this routine, you may
3080 * have to change the find_command routine as well.
3083 static const char *pathopt; /* set by padvance */
3086 shellexec(char **argv, char **envp, const char *path, int idx)
3091 if (strchr(argv[0], '/') != NULL) {
3092 tryexec(argv[0], argv, envp);
3096 while ((cmdname = padvance(&path, argv[0])) != NULL) {
3097 if (--idx < 0 && pathopt == NULL) {
3098 tryexec(cmdname, argv, envp);
3099 if (errno != ENOENT && errno != ENOTDIR)
3106 /* Map to POSIX errors */
3118 exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
3123 * Clear traps on a fork.
3130 for (tp = trap ; tp < &trap[NSIG] ; tp++) {
3131 if (*tp && **tp) { /* trap not NULL or SIG_IGN */
3136 setsignal(tp - trap);
3147 #ifdef CONFIG_ASH_ALIAS
3166 #ifdef CONFIG_ASH_JOB_CONTROL
3171 /* from options.c: */
3175 for (i = 0; i < NOPTS; i++)
3191 for (sm = sigmode ; sm < sigmode + NSIG - 1; sm++) {
3203 static int preadbuffer(void);
3204 static void pushfile (void);
3207 * Read a character from the script, returning PEOF on end of file.
3208 * Nul characters in the input are silently discarded.
3211 #ifndef CONFIG_ASH_OPTIMIZE_FOR_SIZE
3212 #define pgetc_macro() (--parsenleft >= 0? *parsenextc++ : preadbuffer())
3216 return pgetc_macro();
3222 return --parsenleft >= 0? *parsenextc++ : preadbuffer();
3228 return pgetc_macro();
3234 * Undo the last call to pgetc. Only one character may be pushed back.
3235 * PEOF may be pushed back.
3238 static void pungetc(void)
3248 struct parsefile *pf = parsefile;
3257 parsefile = pf->prev;
3259 parsenleft = parsefile->nleft;
3260 parselleft = parsefile->lleft;
3261 parsenextc = parsefile->nextc;
3262 plinno = parsefile->linno;
3268 * Return to top level.
3274 while (parsefile != &basepf)
3279 * Close the file(s) that the shell is reading commands from. Called
3280 * after a fork is done.
3283 static void closescript(void)
3286 if (parsefile->fd > 0) {
3287 close(parsefile->fd);
3294 * Like setinputfile, but takes an open file descriptor. Call this with
3298 static void setinputfd(int fd, int push)
3300 (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
3306 while (parsefile->strpush)
3310 if (parsefile->buf == NULL)
3311 parsefile->buf = xmalloc(BUFSIZ);
3312 parselleft = parsenleft = 0;
3318 * Set the input to take input from a file. If push is set, push the
3319 * old input onto the stack first.
3323 setinputfile(const char *fname, int push)
3329 if ((fd = open(fname, O_RDONLY)) < 0)
3330 error("Can't open %s", fname);
3332 myfileno2 = dup_as_newfd(fd, 10);
3335 error("Out of file descriptors");
3338 setinputfd(fd, push);
3344 tryexec(char *cmd, char **argv, char **envp)
3348 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3352 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
3353 name = get_last_path_component(name);
3356 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++)
3359 for(argc_l=0;*argv_l!=NULL; argv_l++, argc_l++)
3361 run_applet_by_name(name, argc_l, argv);
3363 execve(cmd, argv, envp);
3368 setinputfile(cmd, 0);
3369 commandname = arg0 = xstrdup(argv[0]);
3371 exraise(EXSHELLPROC);
3376 static char *commandtext (const union node *);
3379 * Do a path search. The variable path (passed by reference) should be
3380 * set to the start of the path before the first call; padvance will update
3381 * this value as it proceeds. Successive calls to padvance will return
3382 * the possible path expansions in sequence. If an option (indicated by
3383 * a percent sign) appears in the path entry then the global variable
3384 * pathopt will be set to point to it; otherwise pathopt will be set to
3388 static const char *pathopt;
3390 static void growstackblock(void);
3394 padvance(const char **path, const char *name)
3404 for (p = start ; *p && *p != ':' && *p != '%' ; p++);
3405 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
3406 while (stackblocksize() < len)
3410 memcpy(q, start, p - start);
3418 while (*p && *p != ':') p++;
3424 return stalloc(len);
3428 * Wrapper around strcmp for qsort/bsearch/...
3431 pstrcmp(const void *a, const void *b)
3433 return strcmp((const char *) a, (*(const char *const *) b) + 1);
3437 * Find a keyword is in a sorted array.
3440 static const char *const *
3441 findkwd(const char *s)
3443 return bsearch(s, tokname_array + KWDOFFSET,
3444 (sizeof(tokname_array)/sizeof(const char *)) - KWDOFFSET,
3445 sizeof(const char *), pstrcmp);
3449 /*** Command hashing code ***/
3453 hashcmd(int argc, char **argv)
3455 struct tblentry **pp;
3456 struct tblentry *cmdp;
3459 struct cmdentry entry;
3461 #ifdef CONFIG_ASH_ALIAS
3462 const struct alias *ap;
3466 while ((c = nextopt("rvV")) != '\0') {
3470 } else if (c == 'v' || c == 'V') {
3474 if (*argptr == NULL) {
3475 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
3476 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
3477 if (cmdp->cmdtype != CMDBUILTIN) {
3478 printentry(cmdp, verbose);
3485 while ((name = *argptr++) != NULL) {
3486 if ((cmdp = cmdlookup(name, 0)) != NULL
3487 && (cmdp->cmdtype == CMDNORMAL
3488 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
3490 #ifdef CONFIG_ASH_ALIAS
3491 /* Then look at the aliases */
3492 if ((ap = *__lookupalias(name)) != NULL) {
3494 printf("%s is an alias for %s\n", name, ap->val);
3500 /* First look at the keywords */
3501 if (findkwd(name)!=0) {
3503 printf("%s is a shell keyword\n", name);
3509 find_command(name, &entry, DO_ERR, pathval());
3510 if (entry.cmdtype == CMDUNKNOWN) c = 1;
3512 cmdp = cmdlookup(name, 0);
3513 if (cmdp) printentry(cmdp, verbose=='v');
3521 printentry(struct tblentry *cmdp, int verbose)
3527 printf("%s%s", cmdp->cmdname, (verbose ? " is " : ""));
3528 if (cmdp->cmdtype == CMDNORMAL) {
3529 idx = cmdp->param.index;
3532 name = padvance(&path, cmdp->cmdname);
3534 } while (--idx >= 0);
3537 } else if (cmdp->cmdtype == CMDBUILTIN) {
3539 out1str("a shell builtin");
3540 } else if (cmdp->cmdtype == CMDFUNCTION) {
3543 out1str("a function\n");
3544 name = commandtext(cmdp->param.func);
3545 printf("%s() {\n %s\n}", cmdp->cmdname, name);
3551 error("internal error: cmdtype %d", cmdp->cmdtype);
3554 puts(cmdp->rehash ? "*" : nullstr);
3559 /*** List the available builtins ***/
3562 static int helpcmd(int argc, char** argv)
3566 printf("\nBuilt-in commands:\n-------------------\n");
3567 for (col=0, i=0; i < NUMBUILTINS; i++) {
3568 col += printf("%c%s", ((col == 0) ? '\t' : ' '),
3569 builtincmds[i].name+1);
3575 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3577 extern const struct BB_applet applets[];
3578 extern const size_t NUM_APPLETS;
3580 for (i=0; i < NUM_APPLETS; i++) {
3582 col += printf("%c%s", ((col == 0) ? '\t' : ' '),
3592 return EXIT_SUCCESS;
3596 * Resolve a command name. If you change this routine, you may have to
3597 * change the shellexec routine as well.
3600 static int prefix (const char *, const char *);
3603 find_command(const char *name, struct cmdentry *entry, int act, const char *path)
3605 struct tblentry *cmdp;
3615 struct builtincmd *bcmd;
3617 /* If name contains a slash, don't use the hash table */
3618 if (strchr(name, '/') != NULL) {
3620 while (stat(name, &statb) < 0) {
3621 if (errno != ENOENT && errno != ENOTDIR)
3623 entry->cmdtype = CMDUNKNOWN;
3624 entry->u.index = -1;
3627 entry->cmdtype = CMDNORMAL;
3628 entry->u.index = -1;
3631 entry->cmdtype = CMDNORMAL;
3637 if (act & DO_BRUTE) {
3638 firstchange = path_change(path, &bltin);
3644 /* If name is in the table, and not invalidated by cd, we're done */
3645 if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0) {
3646 if (cmdp->cmdtype == CMDFUNCTION) {
3647 if (act & DO_NOFUN) {
3652 } else if (act & DO_BRUTE) {
3653 if ((cmdp->cmdtype == CMDNORMAL &&
3654 cmdp->param.index >= firstchange) ||
3655 (cmdp->cmdtype == CMDBUILTIN &&
3656 ((builtinloc < 0 && bltin >= 0) ?
3657 bltin : builtinloc) >= firstchange)) {
3658 /* need to recompute the entry */
3667 bcmd = find_builtin(name);
3668 regular = bcmd && IS_BUILTIN_REGULAR(bcmd);
3671 if (cmdp && (cmdp->cmdtype == CMDBUILTIN)) {
3674 } else if (act & DO_BRUTE) {
3675 if (firstchange == 0) {
3680 /* If %builtin not in path, check for builtin next */
3681 if (regular || (bltin < 0 && bcmd)) {
3684 entry->cmdtype = CMDBUILTIN;
3685 entry->u.cmd = bcmd;
3689 cmdp = cmdlookup(name, 1);
3690 cmdp->cmdtype = CMDBUILTIN;
3691 cmdp->param.cmd = bcmd;
3696 /* We have to search path. */
3697 prev = -1; /* where to start */
3698 if (cmdp && cmdp->rehash) { /* doing a rehash */
3699 if (cmdp->cmdtype == CMDBUILTIN)
3702 prev = cmdp->param.index;
3708 while ((fullname = padvance(&path, name)) != NULL) {
3709 stunalloc(fullname);
3711 if (idx >= firstchange) {
3715 if (prefix("builtin", pathopt)) {
3716 if ((bcmd = find_builtin(name))) {
3720 } else if (!(act & DO_NOFUN) &&
3721 prefix("func", pathopt)) {
3724 continue; /* ignore unimplemented options */
3727 /* if rehash, don't redo absolute path names */
3728 if (fullname[0] == '/' && idx <= prev &&
3729 idx < firstchange) {
3732 TRACE(("searchexec \"%s\": no change\n", name));
3735 while (stat(fullname, &statb) < 0) {
3736 if (errno != ENOENT && errno != ENOTDIR)
3740 e = EACCES; /* if we fail, this will be the error */
3741 if (!S_ISREG(statb.st_mode))
3743 if (pathopt) { /* this is a %func directory */
3744 stalloc(strlen(fullname) + 1);
3745 readcmdfile(fullname);
3746 if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
3747 error("%s not defined in %s", name, fullname);
3748 stunalloc(fullname);
3751 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
3752 /* If we aren't called with DO_BRUTE and cmdp is set, it must
3753 be a function and we're being called with DO_NOFUN */
3755 entry->cmdtype = CMDNORMAL;
3756 entry->u.index = idx;
3760 cmdp = cmdlookup(name, 1);
3761 cmdp->cmdtype = CMDNORMAL;
3762 cmdp->param.index = idx;
3767 /* We failed. If there was an entry for this command, delete it */
3768 if (cmdp && updatetbl)
3771 out2fmt("%s: %s\n", name, errmsg(e, E_EXEC));
3772 entry->cmdtype = CMDUNKNOWN;
3777 entry->cmdtype = cmdp->cmdtype;
3778 entry->u = cmdp->param;
3784 * Search the table of builtin commands.
3788 bstrcmp(const void *name, const void *b)
3790 return strcmp((const char *)name, (*(const char *const *) b)+1);
3793 static struct builtincmd *
3794 find_builtin(const char *name)
3796 struct builtincmd *bp;
3798 bp = bsearch(name, builtincmds, NUMBUILTINS, sizeof(struct builtincmd),
3806 * Called when a cd is done. Marks all commands so the next time they
3807 * are executed they will be rehashed.
3813 struct tblentry **pp;
3814 struct tblentry *cmdp;
3816 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
3817 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
3818 if (cmdp->cmdtype == CMDNORMAL
3819 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
3828 * Called before PATH is changed. The argument is the new value of PATH;
3829 * pathval() still returns the old value at this point. Called with
3834 changepath(const char *newval)
3839 firstchange = path_change(newval, &bltin);
3840 if (builtinloc < 0 && bltin >= 0)
3841 builtinloc = bltin; /* zap builtins */
3842 clearcmdentry(firstchange);
3848 * Clear out command entries. The argument specifies the first entry in
3849 * PATH which has changed.
3853 clearcmdentry(int firstchange)
3855 struct tblentry **tblp;
3856 struct tblentry **pp;
3857 struct tblentry *cmdp;
3860 for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
3862 while ((cmdp = *pp) != NULL) {
3863 if ((cmdp->cmdtype == CMDNORMAL &&
3864 cmdp->param.index >= firstchange)
3865 || (cmdp->cmdtype == CMDBUILTIN &&
3866 builtinloc >= firstchange)) {
3879 * Delete all functions.
3885 struct tblentry **tblp;
3886 struct tblentry **pp;
3887 struct tblentry *cmdp;
3890 for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
3892 while ((cmdp = *pp) != NULL) {
3893 if (cmdp->cmdtype == CMDFUNCTION) {
3895 freefunc(cmdp->param.func);
3908 * Locate a command in the command hash table. If "add" is nonzero,
3909 * add the command to the table if it is not already present. The
3910 * variable "lastcmdentry" is set to point to the address of the link
3911 * pointing to the entry, so that delete_cmd_entry can delete the
3915 static struct tblentry **lastcmdentry;
3917 static struct tblentry *
3918 cmdlookup(const char *name, int add)
3922 struct tblentry *cmdp;
3923 struct tblentry **pp;
3930 pp = &cmdtable[hashval % CMDTABLESIZE];
3931 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
3932 if (equal(cmdp->cmdname, name))
3936 if (add && cmdp == NULL) {
3938 cmdp = *pp = xmalloc(sizeof (struct tblentry) - ARB
3939 + strlen(name) + 1);
3941 cmdp->cmdtype = CMDUNKNOWN;
3943 strcpy(cmdp->cmdname, name);
3951 * Delete the command entry returned on the last lookup.
3957 struct tblentry *cmdp;
3960 cmdp = *lastcmdentry;
3961 *lastcmdentry = cmdp->next;
3970 static const unsigned char nodesize[26] = {
3971 ALIGN(sizeof (struct nbinary)),
3972 ALIGN(sizeof (struct ncmd)),
3973 ALIGN(sizeof (struct npipe)),
3974 ALIGN(sizeof (struct nredir)),
3975 ALIGN(sizeof (struct nredir)),
3976 ALIGN(sizeof (struct nredir)),
3977 ALIGN(sizeof (struct nbinary)),
3978 ALIGN(sizeof (struct nbinary)),
3979 ALIGN(sizeof (struct nif)),
3980 ALIGN(sizeof (struct nbinary)),
3981 ALIGN(sizeof (struct nbinary)),
3982 ALIGN(sizeof (struct nfor)),
3983 ALIGN(sizeof (struct ncase)),
3984 ALIGN(sizeof (struct nclist)),
3985 ALIGN(sizeof (struct narg)),
3986 ALIGN(sizeof (struct narg)),
3987 ALIGN(sizeof (struct nfile)),
3988 ALIGN(sizeof (struct nfile)),
3989 ALIGN(sizeof (struct nfile)),
3990 ALIGN(sizeof (struct nfile)),
3991 ALIGN(sizeof (struct nfile)),
3992 ALIGN(sizeof (struct ndup)),
3993 ALIGN(sizeof (struct ndup)),
3994 ALIGN(sizeof (struct nhere)),
3995 ALIGN(sizeof (struct nhere)),
3996 ALIGN(sizeof (struct nnot)),
4002 * Delete a function if it exists.
4006 unsetfunc(char *name)
4008 struct tblentry *cmdp;
4010 if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
4011 freefunc(cmdp->param.func);
4018 * Locate and print what a word is...
4022 typecmd(int argc, char **argv)
4030 for (i = 1; i < argc; i++) {
4031 argv_a[0] = argv[i];
4034 err |= hashcmd(argc, argv);
4039 #ifdef CONFIG_ASH_CMDCMD
4041 commandcmd(int argc, char **argv)
4044 int default_path = 0;
4045 int verify_only = 0;
4046 int verbose_verify_only = 0;
4048 while ((c = nextopt("pvV")) != '\0')
4057 verbose_verify_only = 1;
4061 if (default_path + verify_only + verbose_verify_only > 1 ||
4064 "command [-p] command [arg ...]\n"
4065 "command {-v|-V} command\n");
4069 if (verify_only || verbose_verify_only) {
4073 argv_a[0] = *argptr;
4075 optptr = verbose_verify_only ? "v" : "V"; /* reverse special */
4076 return hashcmd(argc, argv);
4084 path_change(const char *newval, int *bltin)
4086 const char *old, *new;
4092 firstchange = 9999; /* assume no change */
4098 if ((*old == '\0' && *new == ':')
4099 || (*old == ':' && *new == '\0'))
4101 old = new; /* ignore subsequent differences */
4105 if (*new == '%' && *bltin < 0 && prefix("builtin", new + 1))
4112 if (builtinloc >= 0 && *bltin < 0)
4117 * Routines to expand arguments to commands. We have to deal with
4118 * backquotes, shell variables, and file metacharacters.
4123 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
4124 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
4127 * Structure specifying which parts of the string should be searched
4128 * for IFS characters.
4132 struct ifsregion *next; /* next region in list */
4133 int begoff; /* offset of start of region */
4134 int endoff; /* offset of end of region */
4135 int nulonly; /* search for nul bytes only */
4139 static char *expdest; /* output of current string */
4140 static struct nodelist *argbackq; /* list of back quote expressions */
4141 static struct ifsregion ifsfirst; /* first struct in list of ifs regions */
4142 static struct ifsregion *ifslastp; /* last struct in list */
4143 static struct arglist exparg; /* holds expanded arg list */
4145 static void argstr (char *, int);
4146 static char *exptilde (char *, int);
4147 static void expbackq (union node *, int, int);
4148 static int subevalvar (char *, char *, int, int, int, int, int);
4149 static int varisset (char *, int);
4150 static void strtodest (const char *, int, int);
4151 static inline void varvalue (char *, int, int);
4152 static void recordregion (int, int, int);
4153 static void removerecordregions (int);
4154 static void ifsbreakup (char *, struct arglist *);
4155 static void ifsfree (void);
4156 static void expandmeta (struct strlist *, int);
4157 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
4158 #define preglob(p) _rmescapes((p), RMESCAPE_ALLOC | RMESCAPE_GLOB)
4159 #if !defined(GLOB_BROKEN)
4160 static inline void addglob (const glob_t *);
4163 #if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
4164 static void expmeta (char *, char *);
4166 #if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
4167 static struct strlist *expsort (struct strlist *);
4168 static struct strlist *msort (struct strlist *, int);
4170 static int patmatch (char *, char *, int);
4171 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
4172 static int patmatch2 (char *, char *, int);
4174 static int pmatch (char *, char *, int);
4175 #define patmatch2 patmatch
4177 static char *cvtnum (int, char *);
4180 * Expand shell variables and backquotes inside a here document.
4183 /* arg: the document, fd: where to write the expanded version */
4185 expandhere(union node *arg, int fd)
4188 expandarg(arg, (struct arglist *)NULL, 0);
4189 xwrite(fd, stackblock(), expdest - stackblock());
4194 * Perform variable substitution and command substitution on an argument,
4195 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
4196 * perform splitting and file name expansion. When arglist is NULL, perform
4197 * here document expansion.
4201 expandarg(union node *arg, struct arglist *arglist, int flag)
4206 argbackq = arg->narg.backquote;
4207 STARTSTACKSTR(expdest);
4208 ifsfirst.next = NULL;
4210 argstr(arg->narg.text, flag);
4211 if (arglist == NULL) {
4212 return; /* here document expanded */
4214 STPUTC('\0', expdest);
4215 p = grabstackstr(expdest);
4216 exparg.lastp = &exparg.list;
4220 if (flag & EXP_FULL) {
4221 ifsbreakup(p, &exparg);
4222 *exparg.lastp = NULL;
4223 exparg.lastp = &exparg.list;
4224 expandmeta(exparg.list, flag);
4226 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
4228 sp = (struct strlist *)stalloc(sizeof (struct strlist));
4231 exparg.lastp = &sp->next;
4234 *exparg.lastp = NULL;
4236 *arglist->lastp = exparg.list;
4237 arglist->lastp = exparg.lastp;
4243 * Expand a variable, and return a pointer to the next character in the
4247 static inline char * evalvar(char *p, int flag)
4260 int quotes = flag & (EXP_FULL | EXP_CASE);
4263 subtype = varflags & VSTYPE;
4268 p = strchr(p, '=') + 1;
4269 again: /* jump here after setting a variable with ${var=text} */
4271 set = varisset(var, varflags & VSNUL);
4274 val = lookupvar(var);
4275 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
4282 startloc = expdest - stackblock();
4283 if (set && subtype != VSPLUS) {
4284 /* insert the value of the variable */
4286 varvalue(var, varflags & VSQUOTE, flag);
4287 if (subtype == VSLENGTH) {
4288 varlen = expdest - stackblock() - startloc;
4289 STADJUST(-varlen, expdest);
4292 if (subtype == VSLENGTH) {
4293 varlen = strlen(val);
4297 varflags & VSQUOTE ?
4298 DQSYNTAX : BASESYNTAX,
4305 if (subtype == VSPLUS)
4308 easy = ((varflags & VSQUOTE) == 0 ||
4309 (*var == '@' && shellparam.nparam != 1));
4314 expdest = cvtnum(varlen, expdest);
4321 recordregion(startloc, expdest - stackblock(),
4322 varflags & VSQUOTE);
4338 case VSTRIMRIGHTMAX:
4342 * Terminate the string and start recording the pattern
4345 STPUTC('\0', expdest);
4346 patloc = expdest - stackblock();
4347 if (subevalvar(p, NULL, patloc, subtype,
4348 startloc, varflags, quotes) == 0) {
4349 int amount = (expdest - stackblock() - patloc) + 1;
4350 STADJUST(-amount, expdest);
4352 /* Remove any recorded regions beyond start of variable */
4353 removerecordregions(startloc);
4359 if (subevalvar(p, var, 0, subtype, startloc,
4360 varflags, quotes)) {
4363 * Remove any recorded regions beyond
4366 removerecordregions(startloc);
4381 if (subtype != VSNORMAL) { /* skip to end of alternative */
4384 if ((c = *p++) == CTLESC)
4386 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
4388 argbackq = argbackq->next;
4389 } else if (c == CTLVAR) {
4390 if ((*p++ & VSTYPE) != VSNORMAL)
4392 } else if (c == CTLENDVAR) {
4403 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
4404 * characters to allow for further processing. Otherwise treat
4405 * $@ like $* since no splitting will be performed.
4409 argstr(char *p, int flag)
4412 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
4415 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
4416 p = exptilde(p, flag);
4420 case CTLENDVAR: /* ??? */
4423 /* "$@" syntax adherence hack */
4424 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
4426 if ((flag & EXP_FULL) != 0)
4436 p = evalvar(p, flag);
4439 case CTLBACKQ|CTLQUOTE:
4440 expbackq(argbackq->n, c & CTLQUOTE, flag);
4441 argbackq = argbackq->next;
4443 #ifdef CONFIG_ASH_MATH_SUPPORT
4451 * sort of a hack - expand tildes in variable
4452 * assignments (after the first '=' and after ':'s).
4455 if (flag & EXP_VARTILDE && *p == '~') {
4462 p = exptilde(p, flag);
4473 exptilde(char *p, int flag)
4475 char c, *startp = p;
4478 int quotes = flag & (EXP_FULL | EXP_CASE);
4480 while ((c = *p) != '\0') {
4487 if (flag & EXP_VARTILDE)
4497 if (*(startp+1) == '\0') {
4498 if ((home = lookupvar("HOME")) == NULL)
4501 if ((pw = getpwnam(startp+1)) == NULL)
4508 strtodest(home, SQSYNTAX, quotes);
4517 removerecordregions(int endoff)
4519 if (ifslastp == NULL)
4522 if (ifsfirst.endoff > endoff) {
4523 while (ifsfirst.next != NULL) {
4524 struct ifsregion *ifsp;
4526 ifsp = ifsfirst.next->next;
4527 ckfree(ifsfirst.next);
4528 ifsfirst.next = ifsp;
4531 if (ifsfirst.begoff > endoff)
4534 ifslastp = &ifsfirst;
4535 ifsfirst.endoff = endoff;
4540 ifslastp = &ifsfirst;
4541 while (ifslastp->next && ifslastp->next->begoff < endoff)
4542 ifslastp=ifslastp->next;
4543 while (ifslastp->next != NULL) {
4544 struct ifsregion *ifsp;
4546 ifsp = ifslastp->next->next;
4547 ckfree(ifslastp->next);
4548 ifslastp->next = ifsp;
4551 if (ifslastp->endoff > endoff)
4552 ifslastp->endoff = endoff;
4556 #ifdef CONFIG_ASH_MATH_SUPPORT
4558 * Expand arithmetic expression. Backup to start of expression,
4559 * evaluate, place result in (backed up) result, adjust string position.
4568 int quotes = flag & (EXP_FULL | EXP_CASE);
4574 * This routine is slightly over-complicated for
4575 * efficiency. First we make sure there is
4576 * enough space for the result, which may be bigger
4577 * than the expression if we add exponentation. Next we
4578 * scan backwards looking for the start of arithmetic. If the
4579 * next previous character is a CTLESC character, then we
4580 * have to rescan starting from the beginning since CTLESC
4581 * characters have to be processed left to right.
4583 CHECKSTRSPACE(10, expdest);
4584 USTPUTC('\0', expdest);
4585 start = stackblock();
4587 while (*p != CTLARI && p >= start)
4590 error("missing CTLARI (shouldn't happen)");
4591 if (p > start && *(p-1) == CTLESC)
4592 for (p = start; *p != CTLARI; p++)
4601 removerecordregions(begoff);
4604 result = arith(p+2, &errcode);
4607 error("divide by zero");
4609 error("syntax error: \"%s\"\n", p+2);
4611 snprintf(p, 12, "%d", result);
4617 recordregion(begoff, p - 1 - start, 0);
4618 result = expdest - p + 1;
4619 STADJUST(-result, expdest);
4624 * Expand stuff in backwards quotes.
4628 expbackq(union node *cmd, int quoted, int flag)
4630 volatile struct backcmd in;
4634 char *dest = expdest;
4635 volatile struct ifsregion saveifs;
4636 struct ifsregion *volatile savelastp;
4637 struct nodelist *volatile saveargbackq;
4639 int startloc = dest - stackblock();
4640 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
4641 volatile int saveherefd;
4642 int quotes = flag & (EXP_FULL | EXP_CASE);
4643 struct jmploc jmploc;
4644 struct jmploc *volatile savehandler;
4648 /* Avoid longjmp clobbering */
4659 savelastp = ifslastp;
4660 saveargbackq = argbackq;
4661 saveherefd = herefd;
4663 if ((ex = setjmp(jmploc.loc))) {
4666 savehandler = handler;
4669 p = grabstackstr(dest);
4670 evalbackcmd(cmd, (struct backcmd *) &in);
4671 ungrabstackstr(p, dest);
4675 ifslastp = savelastp;
4676 argbackq = saveargbackq;
4677 herefd = saveherefd;
4685 if (--in.nleft < 0) {
4688 i = safe_read(in.fd, buf, sizeof buf);
4689 TRACE(("expbackq: read returns %d\n", i));
4696 if (lastc != '\0') {
4697 if (quotes && SIT(lastc, syntax) == CCTL)
4698 STPUTC(CTLESC, dest);
4699 STPUTC(lastc, dest);
4703 /* Eat all trailing newlines */
4704 for (; dest > stackblock() && dest[-1] == '\n';)
4713 exitstatus = waitforjob(in.jp);
4714 handler = savehandler;
4716 longjmp(handler->loc, 1);
4719 recordregion(startloc, dest - stackblock(), 0);
4720 TRACE(("evalbackq: size=%d: \"%.*s\"\n",
4721 (dest - stackblock()) - startloc,
4722 (dest - stackblock()) - startloc,
4723 stackblock() + startloc));
4729 subevalvar(char *p, char *str, int strloc, int subtype, int startloc, int varflags, int quotes)
4735 int saveherefd = herefd;
4736 struct nodelist *saveargbackq = argbackq;
4740 argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0);
4741 STACKSTRNUL(expdest);
4742 herefd = saveherefd;
4743 argbackq = saveargbackq;
4744 startp = stackblock() + startloc;
4746 str = stackblock() + strloc;
4750 setvar(str, startp, 0);
4751 amount = startp - expdest;
4752 STADJUST(amount, expdest);
4759 if (*p != CTLENDVAR) {
4760 out2fmt(snlfmt, startp);
4761 error((char *)NULL);
4763 error("%.*s: parameter %snot set", p - str - 1,
4764 str, (varflags & VSNUL) ? "null or "
4769 for (loc = startp; loc < str; loc++) {
4772 if (patmatch2(str, startp, quotes))
4775 if (quotes && *loc == CTLESC)
4781 for (loc = str - 1; loc >= startp;) {
4784 if (patmatch2(str, startp, quotes))
4788 if (quotes && loc > startp && *(loc - 1) == CTLESC) {
4789 for (q = startp; q < loc; q++)
4799 for (loc = str - 1; loc >= startp;) {
4800 if (patmatch2(str, loc, quotes))
4803 if (quotes && loc > startp && *(loc - 1) == CTLESC) {
4804 for (q = startp; q < loc; q++)
4813 case VSTRIMRIGHTMAX:
4814 for (loc = startp; loc < str - 1; loc++) {
4815 if (patmatch2(str, loc, quotes))
4817 if (quotes && *loc == CTLESC)
4830 amount = ((str - 1) - (loc - startp)) - expdest;
4831 STADJUST(amount, expdest);
4832 while (loc != str - 1)
4837 amount = loc - expdest;
4838 STADJUST(amount, expdest);
4839 STPUTC('\0', expdest);
4840 STADJUST(-1, expdest);
4846 * Test whether a specialized variable is set.
4850 varisset(char *name, int nulok)
4853 return backgndpid != -1;
4854 else if (*name == '@' || *name == '*') {
4855 if (*shellparam.p == NULL)
4861 for (av = shellparam.p; *av; av++)
4866 } else if (is_digit(*name)) {
4868 int num = atoi(name);
4870 if (num > shellparam.nparam)
4876 ap = shellparam.p[num - 1];
4878 if (nulok && (ap == NULL || *ap == '\0'))
4885 * Put a string on the stack.
4889 strtodest(const char *p, int syntax, int quotes)
4892 if (quotes && SIT(*p,syntax) == CCTL)
4893 STPUTC(CTLESC, expdest);
4894 STPUTC(*p++, expdest);
4899 * Add the value of a specialized variable to the stack string.
4903 varvalue(char *name, int quoted, int flags)
4912 int allow_split = flags & EXP_FULL;
4913 int quotes = flags & (EXP_FULL | EXP_CASE);
4915 syntax = quoted ? DQSYNTAX : BASESYNTAX;
4924 num = shellparam.nparam;
4929 expdest = cvtnum(num, expdest);
4932 for (i = 0 ; i < NOPTS ; i++) {
4934 STPUTC(optent_letter(optlist[i]), expdest);
4938 if (allow_split && quoted) {
4939 sep = 1 << CHAR_BIT;
4944 sep = ifsset() ? ifsval()[0] : ' ';
4946 sepq = SIT(sep,syntax) == CCTL;
4949 for (ap = shellparam.p ; (p = *ap++) != NULL ; ) {
4950 strtodest(p, syntax, quotes);
4953 STPUTC(CTLESC, expdest);
4954 STPUTC(sep, expdest);
4959 strtodest(arg0, syntax, quotes);
4963 if (num > 0 && num <= shellparam.nparam) {
4964 strtodest(shellparam.p[num - 1], syntax, quotes);
4972 * Record the fact that we have to scan this region of the
4973 * string for IFS characters.
4977 recordregion(int start, int end, int nulonly)
4979 struct ifsregion *ifsp;
4981 if (ifslastp == NULL) {
4985 ifsp = (struct ifsregion *)xmalloc(sizeof (struct ifsregion));
4987 ifslastp->next = ifsp;
4991 ifslastp->begoff = start;
4992 ifslastp->endoff = end;
4993 ifslastp->nulonly = nulonly;
4999 * Break the argument string into pieces based upon IFS and add the
5000 * strings to the argument list. The regions of the string to be
5001 * searched for IFS characters have been stored by recordregion.
5004 ifsbreakup(char *string, struct arglist *arglist)
5006 struct ifsregion *ifsp;
5011 const char *ifs, *realifs;
5019 realifs = ifsset() ? ifsval() : defifs;
5020 if (ifslastp != NULL) {
5023 p = string + ifsp->begoff;
5024 nulonly = ifsp->nulonly;
5025 ifs = nulonly ? nullstr : realifs;
5027 while (p < string + ifsp->endoff) {
5031 if (strchr(ifs, *p)) {
5033 ifsspc = (strchr(defifs, *p) != NULL);
5034 /* Ignore IFS whitespace at start */
5035 if (q == start && ifsspc) {
5041 sp = (struct strlist *)stalloc(sizeof *sp);
5043 *arglist->lastp = sp;
5044 arglist->lastp = &sp->next;
5048 if (p >= string + ifsp->endoff) {
5054 if (strchr(ifs, *p) == NULL ) {
5057 } else if (strchr(defifs, *p) == NULL) {
5073 } while ((ifsp = ifsp->next) != NULL);
5074 if (!(*start || (!ifsspc && start > string && nulonly))) {
5079 sp = (struct strlist *)stalloc(sizeof *sp);
5081 *arglist->lastp = sp;
5082 arglist->lastp = &sp->next;
5088 while (ifsfirst.next != NULL) {
5089 struct ifsregion *ifsp;
5091 ifsp = ifsfirst.next->next;
5092 ckfree(ifsfirst.next);
5093 ifsfirst.next = ifsp;
5097 ifsfirst.next = NULL;
5101 * Add a file name to the list.
5105 addfname(const char *name)
5109 sp = (struct strlist *)stalloc(sizeof *sp);
5110 sp->text = sstrdup(name);
5112 exparg.lastp = &sp->next;
5116 * Expand shell metacharacters. At this point, the only control characters
5117 * should be escapes. The results are stored in the list exparg.
5120 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN)
5122 expandmeta(struct strlist *str, int flag)
5126 /* TODO - EXP_REDIR */
5131 p = preglob(str->text);
5133 switch (glob(p, 0, 0, &pglob)) {
5135 if(pglob.gl_pathv[1]==0 && !strcmp(p, pglob.gl_pathv[0]))
5146 *exparg.lastp = str;
5147 rmescapes(str->text);
5148 exparg.lastp = &str->next;
5150 default: /* GLOB_NOSPACE */
5151 error("Out of space");
5159 * Add the result of glob(3) to the list.
5163 addglob(const glob_t *pglob)
5165 char **p = pglob->gl_pathv;
5173 #else /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
5174 static char *expdir;
5178 expandmeta(struct strlist *str, int flag)
5181 struct strlist **savelastp;
5184 /* TODO - EXP_REDIR */
5190 for (;;) { /* fast check for meta chars */
5191 if ((c = *p++) == '\0')
5193 if (c == '*' || c == '?' || c == '[' || c == '!')
5196 savelastp = exparg.lastp;
5198 if (expdir == NULL) {
5199 int i = strlen(str->text);
5200 expdir = xmalloc(i < 2048 ? 2048 : i); /* XXX */
5203 expmeta(expdir, str->text);
5207 if (exparg.lastp == savelastp) {
5212 *exparg.lastp = str;
5213 rmescapes(str->text);
5214 exparg.lastp = &str->next;
5216 *exparg.lastp = NULL;
5217 *savelastp = sp = expsort(*savelastp);
5218 while (sp->next != NULL)
5220 exparg.lastp = &sp->next;
5228 * Do metacharacter (i.e. *, ?, [...]) expansion.
5232 expmeta(char *enddir, char *name)
5248 for (p = name ; ; p++) {
5249 if (*p == '*' || *p == '?')
5251 else if (*p == '[') {
5256 while (*q == CTLQUOTEMARK)
5260 if (*q == '/' || *q == '\0')
5267 } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) {
5269 } else if (*p == '\0')
5271 else if (*p == CTLQUOTEMARK)
5273 else if (*p == CTLESC)
5281 if (metaflag == 0) { /* we've reached the end of the file name */
5282 if (enddir != expdir)
5284 for (p = name ; ; p++) {
5285 if (*p == CTLQUOTEMARK)
5293 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
5298 if (start != name) {
5301 while (*p == CTLQUOTEMARK)
5308 if (enddir == expdir) {
5310 } else if (enddir == expdir + 1 && *expdir == '/') {
5316 if ((dirp = opendir(cp)) == NULL)
5318 if (enddir != expdir)
5320 if (*endname == 0) {
5328 while (*p == CTLQUOTEMARK)
5334 while (! int_pending() && (dp = readdir(dirp)) != NULL) {
5335 if (dp->d_name[0] == '.' && ! matchdot)
5337 if (patmatch(start, dp->d_name, 0)) {
5339 strcpy(enddir, dp->d_name);
5342 for (p = enddir, cp = dp->d_name;
5343 (*p++ = *cp++) != '\0';)
5346 expmeta(p, endname);
5354 #endif /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
5358 #if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
5360 * Sort the results of file name expansion. It calculates the number of
5361 * strings to sort and then calls msort (short for merge sort) to do the
5365 static struct strlist *
5366 expsort(struct strlist *str)
5372 for (sp = str ; sp ; sp = sp->next)
5374 return msort(str, len);
5378 static struct strlist *
5379 msort(struct strlist *list, int len)
5381 struct strlist *p, *q = NULL;
5382 struct strlist **lpp;
5390 for (n = half ; --n >= 0 ; ) {
5394 q->next = NULL; /* terminate first half of list */
5395 q = msort(list, half); /* sort first half of list */
5396 p = msort(p, len - half); /* sort second half */
5399 if (strcmp(p->text, q->text) < 0) {
5402 if ((p = *lpp) == NULL) {
5409 if ((q = *lpp) == NULL) {
5422 * Returns true if the pattern matches the string.
5425 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
5426 /* squoted: string might have quote chars */
5428 patmatch(char *pattern, char *string, int squoted)
5433 p = preglob(pattern);
5434 q = squoted ? _rmescapes(string, RMESCAPE_ALLOC) : string;
5436 return !fnmatch(p, q, 0);
5441 patmatch2(char *pattern, char *string, int squoted)
5447 p = grabstackstr(expdest);
5448 res = patmatch(pattern, string, squoted);
5449 ungrabstackstr(p, expdest);
5454 patmatch(char *pattern, char *string, int squoted) {
5455 return pmatch(pattern, string, squoted);
5460 pmatch(char *pattern, char *string, int squoted)
5472 if (squoted && *q == CTLESC)
5480 if (squoted && *q == CTLESC)
5487 while (c == CTLQUOTEMARK || c == '*')
5489 if (c != CTLESC && c != CTLQUOTEMARK &&
5490 c != '?' && c != '*' && c != '[') {
5492 if (squoted && *q == CTLESC &&
5497 if (squoted && *q == CTLESC)
5503 if (pmatch(p, q, squoted))
5505 if (squoted && *q == CTLESC)
5507 } while (*q++ != '\0');
5518 while (*endp == CTLQUOTEMARK)
5521 goto dft; /* no matching ] */
5522 if (*endp == CTLESC)
5534 if (squoted && chr == CTLESC)
5540 if (c == CTLQUOTEMARK)
5544 if (*p == '-' && p[1] != ']') {
5546 while (*p == CTLQUOTEMARK)
5550 if (chr >= c && chr <= *p)
5557 } while ((c = *p++) != ']');
5558 if (found == invert)
5563 if (squoted && *q == CTLESC)
5580 * Remove any CTLESC characters from a string.
5583 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
5585 _rmescapes(char *str, int flag)
5588 static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 };
5590 p = strpbrk(str, qchars);
5596 if (flag & RMESCAPE_ALLOC) {
5597 size_t len = p - str;
5598 q = r = stalloc(strlen(p) + len + 1);
5600 memcpy(q, str, len);
5605 if (*p == CTLQUOTEMARK) {
5611 if (flag & RMESCAPE_GLOB && *p != '/') {
5622 rmescapes(char *str)
5627 while (*p != CTLESC && *p != CTLQUOTEMARK) {
5633 if (*p == CTLQUOTEMARK) {
5648 * See if a pattern matches in a case statement.
5652 casematch(union node *pattern, const char *val)
5654 struct stackmark smark;
5658 setstackmark(&smark);
5659 argbackq = pattern->narg.backquote;
5660 STARTSTACKSTR(expdest);
5662 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
5663 STPUTC('\0', expdest);
5664 p = grabstackstr(expdest);
5665 result = patmatch(p, (char *)val, 0);
5666 popstackmark(&smark);
5675 cvtnum(int num, char *buf)
5679 CHECKSTRSPACE(32, buf);
5680 len = sprintf(buf, "%d", num);
5685 * Editline and history functions (and glue).
5687 static int histcmd(int argc, char **argv)
5689 error("not compiled with history support");
5695 struct redirtab *next;
5696 short renamed[10]; /* Current ash support only 0-9 descriptors */
5697 /* char on arm (and others) can't be negative */
5700 static struct redirtab *redirlist;
5702 extern char **environ;
5707 * Initialization code.
5721 basepf.nextc = basepf.buf = basebuf;
5730 for (envp = environ ; *envp ; envp++) {
5731 if (strchr(*envp, '=')) {
5732 setvareq(*envp, VEXPORT|VTEXTFIXED);
5736 snprintf(ppid, sizeof(ppid), "%d", (int) getppid());
5737 setvar("PPID", ppid, 0);
5744 * This routine is called when an error or an interrupt occurs in an
5745 * interactive shell and control is returned to the main command loop.
5748 /* 1 == check for aliases, 2 == also check for assignments */
5749 static int checkalias; /* also used in no alias mode for check assignments */
5763 if (exception != EXSHELLPROC)
5764 parselleft = parsenleft = 0; /* clear input buffer */
5768 /* from parser.c: */
5786 * This file implements the input routines used by the parser.
5789 #ifdef CONFIG_FEATURE_COMMAND_EDITING
5790 static const char * cmdedit_prompt;
5791 static inline void putprompt(const char *s) {
5795 static inline void putprompt(const char *s) {
5800 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
5805 * Same as pgetc(), but ignores PEOA.
5808 #ifdef CONFIG_ASH_ALIAS
5815 } while (c == PEOA);
5819 static inline int pgetc2(void) { return pgetc_macro(); }
5823 * Read a line from the script.
5826 static inline char *
5827 pfgets(char *line, int len)
5833 while (--nleft > 0) {
5852 char *buf = parsefile->buf;
5856 #ifdef CONFIG_FEATURE_COMMAND_EDITING
5858 if (!iflag || parsefile->fd)
5859 nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
5861 nr = cmdedit_read_input((char*)cmdedit_prompt, buf);
5865 nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
5869 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
5870 int flags = fcntl(0, F_GETFL, 0);
5871 if (flags >= 0 && flags & O_NONBLOCK) {
5872 flags &=~ O_NONBLOCK;
5873 if (fcntl(0, F_SETFL, flags) >= 0) {
5874 out2str("sh: turning off NDELAY mode\n");
5886 struct strpush *sp = parsefile->strpush;
5889 #ifdef CONFIG_ASH_ALIAS
5891 if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
5896 if (sp->string != sp->ap->val) {
5900 sp->ap->flag &= ~ALIASINUSE;
5901 if (sp->ap->flag & ALIASDEAD) {
5902 unalias(sp->ap->name);
5906 parsenextc = sp->prevstring;
5907 parsenleft = sp->prevnleft;
5908 /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
5909 parsefile->strpush = sp->prev;
5910 if (sp != &(parsefile->basestrpush))
5917 * Refill the input buffer and return the next input character:
5919 * 1) If a string was pushed back on the input, pop it;
5920 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
5921 * from a string so we can't refill the buffer, return EOF.
5922 * 3) If the is more stuff in this buffer, use it else call read to fill it.
5923 * 4) Process input up to the next newline, deleting nul characters.
5933 while (parsefile->strpush) {
5934 #ifdef CONFIG_ASH_ALIAS
5935 if (parsenleft == -1 && parsefile->strpush->ap &&
5936 parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
5941 if (--parsenleft >= 0)
5942 return (*parsenextc++);
5944 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
5949 if (parselleft <= 0) {
5950 if ((parselleft = preadfd()) <= 0) {
5951 parselleft = parsenleft = EOF_NLEFT;
5958 /* delete nul characters */
5959 for (more = 1; more;) {
5967 parsenleft = q - parsenextc;
5968 more = 0; /* Stop processing here */
5974 if (--parselleft <= 0 && more) {
5975 parsenleft = q - parsenextc - 1;
5986 out2str(parsenextc);
5991 return *parsenextc++;
5996 * Push a string back onto the input at this current parsefile level.
5997 * We handle aliases this way.
6000 pushstring(char *s, int len, void *ap)
6005 /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
6006 if (parsefile->strpush) {
6007 sp = xmalloc(sizeof (struct strpush));
6008 sp->prev = parsefile->strpush;
6009 parsefile->strpush = sp;
6011 sp = parsefile->strpush = &(parsefile->basestrpush);
6012 sp->prevstring = parsenextc;
6013 sp->prevnleft = parsenleft;
6014 #ifdef CONFIG_ASH_ALIAS
6015 sp->ap = (struct alias *)ap;
6017 ((struct alias *)ap)->flag |= ALIASINUSE;
6028 * Like setinputfile, but takes input from a string.
6032 setinputstring(char *string)
6036 parsenextc = string;
6037 parsenleft = strlen(string);
6038 parsefile->buf = NULL;
6046 * To handle the "." command, a stack of input files is used. Pushfile
6047 * adds a new entry to the stack and popfile restores the previous level.
6053 struct parsefile *pf;
6055 parsefile->nleft = parsenleft;
6056 parsefile->lleft = parselleft;
6057 parsefile->nextc = parsenextc;
6058 parsefile->linno = plinno;
6059 pf = (struct parsefile *)xmalloc(sizeof (struct parsefile));
6060 pf->prev = parsefile;
6063 pf->basestrpush.prev = NULL;
6067 #ifdef CONFIG_ASH_JOB_CONTROL
6068 static void restartjob (struct job *);
6070 static void freejob (struct job *);
6071 static struct job *getjob (const char *);
6072 static int dowait (int, struct job *);
6073 static void waitonint(int);
6077 * We keep track of whether or not fd0 has been redirected. This is for
6078 * background commands, where we want to redirect fd0 to /dev/null only
6079 * if it hasn't already been redirected.
6081 static int fd0_redirected = 0;
6083 /* Return true if fd 0 has already been redirected at least once. */
6085 fd0_redirected_p (void)
6087 return fd0_redirected != 0;
6090 static void dupredirect (const union node *, int, int fd1dup);
6092 #ifdef CONFIG_ASH_JOB_CONTROL
6094 * Turn job control on and off.
6096 * Note: This code assumes that the third arg to ioctl is a character
6097 * pointer, which is true on Berkeley systems but not System V. Since
6098 * System V doesn't have job control yet, this isn't a problem now.
6103 static void setjobctl(int enable)
6105 #ifdef OLD_TTY_DRIVER
6109 if (enable == jobctl || rootshell == 0)
6112 do { /* while we are in the background */
6113 #ifdef OLD_TTY_DRIVER
6114 if (ioctl(2, TIOCGPGRP, (char *)&initialpgrp) < 0) {
6116 initialpgrp = tcgetpgrp(2);
6117 if (initialpgrp < 0) {
6119 out2str("sh: can't access tty; job control turned off\n");
6123 if (initialpgrp == -1)
6124 initialpgrp = getpgrp();
6125 else if (initialpgrp != getpgrp()) {
6126 killpg(initialpgrp, SIGTTIN);
6130 #ifdef OLD_TTY_DRIVER
6131 if (ioctl(2, TIOCGETD, (char *)&ldisc) < 0 || ldisc != NTTYDISC) {
6132 out2str("sh: need new tty driver to run job control; job control turned off\n");
6140 setpgid(0, rootpid);
6141 #ifdef OLD_TTY_DRIVER
6142 ioctl(2, TIOCSPGRP, (char *)&rootpid);
6144 tcsetpgrp(2, rootpid);
6146 } else { /* turning job control off */
6147 setpgid(0, initialpgrp);
6148 #ifdef OLD_TTY_DRIVER
6149 ioctl(2, TIOCSPGRP, (char *)&initialpgrp);
6151 tcsetpgrp(2, initialpgrp);
6162 #ifdef CONFIG_ASH_JOB_CONTROL
6164 killcmd(int argc, char **argv)
6175 "Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n"
6176 "kill -l [exitstatus]"
6180 if (*argv[1] == '-') {
6181 signo = decode_signal(argv[1] + 1, 1);
6185 while ((c = nextopt("ls:")) != '\0')
6191 signo = decode_signal(optionarg, 1);
6194 "invalid signal number or name: %s",
6202 "nextopt returned character code 0%o", c);
6209 if (!list && signo < 0)
6212 if ((signo < 0 || !*argptr) ^ list) {
6221 for (i = 1; i < NSIG; i++) {
6222 name = u_signal_names(0, &i, 1);
6228 name = u_signal_names(*argptr, &signo, -1);
6232 error("invalid signal number or exit status: %s",
6238 if (**argptr == '%') {
6239 jp = getjob(*argptr);
6240 if (jp->jobctl == 0)
6241 error("job %s not created under job control",
6243 pid = -jp->ps[0].pid;
6245 pid = atoi(*argptr);
6246 if (kill(pid, signo) != 0)
6247 error("%s: %m", *argptr);
6248 } while (*++argptr);
6254 fgcmd(int argc, char **argv)
6260 jp = getjob(argv[1]);
6261 if (jp->jobctl == 0)
6262 error("job not created under job control");
6263 pgrp = jp->ps[0].pid;
6264 #ifdef OLD_TTY_DRIVER
6265 ioctl(2, TIOCSPGRP, (char *)&pgrp);
6270 status = waitforjob(jp);
6276 bgcmd(int argc, char **argv)
6281 jp = getjob(*++argv);
6282 if (jp->jobctl == 0)
6283 error("job not created under job control");
6285 } while (--argc > 1);
6291 restartjob(struct job *jp)
6293 struct procstat *ps;
6296 if (jp->state == JOBDONE)
6299 killpg(jp->ps[0].pid, SIGCONT);
6300 for (ps = jp->ps, i = jp->nprocs ; --i >= 0 ; ps++) {
6301 if (WIFSTOPPED(ps->status)) {
6310 static void showjobs(int change);
6314 jobscmd(int argc, char **argv)
6322 * Print a list of jobs. If "change" is nonzero, only print jobs whose
6323 * statuses have changed since the last call to showjobs.
6325 * If the shell is interrupted in the process of creating a job, the
6326 * result may be a job structure containing zero processes. Such structures
6327 * will be freed here.
6331 showjobs(int change)
6337 struct procstat *ps;
6341 TRACE(("showjobs(%d) called\n", change));
6342 while (dowait(0, (struct job *)NULL) > 0);
6343 for (jobno = 1, jp = jobtab ; jobno <= njobs ; jobno++, jp++) {
6346 if (jp->nprocs == 0) {
6350 if (change && ! jp->changed)
6352 procno = jp->nprocs;
6353 for (ps = jp->ps ; ; ps++) { /* for each process */
6355 snprintf(s, 64, "[%d] %ld ", jobno,
6358 snprintf(s, 64, " %ld ",
6363 if (ps->status == -1) {
6364 /* don't print anything */
6365 } else if (WIFEXITED(ps->status)) {
6366 snprintf(s, 64, "Exit %d",
6367 WEXITSTATUS(ps->status));
6369 #ifdef CONFIG_ASH_JOB_CONTROL
6370 if (WIFSTOPPED(ps->status))
6371 i = WSTOPSIG(ps->status);
6372 else /* WIFSIGNALED(ps->status) */
6374 i = WTERMSIG(ps->status);
6375 if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F])
6376 strcpy(s, sys_siglist[i & 0x7F]);
6378 snprintf(s, 64, "Signal %d", i & 0x7F);
6379 if (WCOREDUMP(ps->status))
6380 strcat(s, " (core dumped)");
6385 "%*c%s\n", 30 - col >= 0 ? 30 - col : 0, ' ',
6392 if (jp->state == JOBDONE) {
6400 * Mark a job structure as unused.
6404 freejob(struct job *jp)
6406 const struct procstat *ps;
6410 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
6411 if (ps->cmd != nullstr)
6414 if (jp->ps != &jp->ps0)
6417 #ifdef CONFIG_ASH_JOB_CONTROL
6418 if (curjob == jp - jobtab + 1)
6427 waitcmd(int argc, char **argv)
6435 job = getjob(*++argv);
6439 for (;;) { /* loop until process terminated or stopped */
6442 status = job->ps[job->nprocs - 1].status;
6448 if (WIFEXITED(status))
6449 retval = WEXITSTATUS(status);
6450 #ifdef CONFIG_ASH_JOB_CONTROL
6451 else if (WIFSTOPPED(status))
6452 retval = WSTOPSIG(status) + 128;
6455 /* XXX: limits number of signals */
6456 retval = WTERMSIG(status) + 128;
6461 for (jp = jobtab ; ; jp++) {
6462 if (jp >= jobtab + njobs) { /* no running procs */
6465 if (jp->used && jp->state == 0)
6469 if (dowait(2, 0) < 0 && errno == EINTR) {
6478 * Convert a job name to a job structure.
6482 getjob(const char *name)
6490 #ifdef CONFIG_ASH_JOB_CONTROL
6492 if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0)
6493 error("No current job");
6494 return &jobtab[jobno - 1];
6496 error("No current job");
6498 } else if (name[0] == '%') {
6499 if (is_digit(name[1])) {
6500 jobno = number(name + 1);
6501 if (jobno > 0 && jobno <= njobs
6502 && jobtab[jobno - 1].used != 0)
6503 return &jobtab[jobno - 1];
6504 #ifdef CONFIG_ASH_JOB_CONTROL
6505 } else if (name[1] == '%' && name[2] == '\0') {
6509 struct job *found = NULL;
6510 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
6511 if (jp->used && jp->nprocs > 0
6512 && prefix(name + 1, jp->ps[0].cmd)) {
6514 error("%s: ambiguous", name);
6521 } else if (is_number(name, &pid)) {
6522 for (jp = jobtab, i = njobs ; --i >= 0 ; jp++) {
6523 if (jp->used && jp->nprocs > 0
6524 && jp->ps[jp->nprocs - 1].pid == pid)
6528 error("No such job: %s", name);
6535 * Return a new job structure,
6539 makejob(const union node *node, int nprocs)
6544 for (i = njobs, jp = jobtab ; ; jp++) {
6548 jobtab = xmalloc(4 * sizeof jobtab[0]);
6550 jp = xmalloc((njobs + 4) * sizeof jobtab[0]);
6551 memcpy(jp, jobtab, njobs * sizeof jp[0]);
6552 /* Relocate `ps' pointers */
6553 for (i = 0; i < njobs; i++)
6554 if (jp[i].ps == &jobtab[i].ps0)
6555 jp[i].ps = &jp[i].ps0;
6559 jp = jobtab + njobs;
6560 for (i = 4 ; --i >= 0 ; jobtab[njobs++].used = 0);
6572 #ifdef CONFIG_ASH_JOB_CONTROL
6573 jp->jobctl = jobctl;
6576 jp->ps = xmalloc(nprocs * sizeof (struct procstat));
6581 TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
6588 * Fork of a subshell. If we are doing job control, give the subshell its
6589 * own process group. Jp is a job structure that the job is to be added to.
6590 * N is the command that will be evaluated by the child. Both jp and n may
6591 * be NULL. The mode parameter can be one of the following:
6592 * FORK_FG - Fork off a foreground process.
6593 * FORK_BG - Fork off a background process.
6594 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
6595 * process group even if job control is on.
6597 * When job control is turned off, background processes have their standard
6598 * input redirected to /dev/null (except for the second and later processes
6605 forkshell(struct job *jp, const union node *n, int mode)
6608 #ifdef CONFIG_ASH_JOB_CONTROL
6611 const char *devnull = _PATH_DEVNULL;
6612 const char *nullerr = "Can't open %s";
6614 TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long)n,
6617 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
6623 TRACE(("Fork failed, errno=%d\n", errno));
6625 error("Cannot fork");
6632 TRACE(("Child shell %d\n", getpid()));
6633 wasroot = rootshell;
6638 #ifdef CONFIG_ASH_JOB_CONTROL
6639 jobctl = 0; /* do job control only in root shell */
6640 if (wasroot && mode != FORK_NOJOB && mflag) {
6641 if (jp == NULL || jp->nprocs == 0)
6644 pgrp = jp->ps[0].pid;
6646 if (mode == FORK_FG) {
6647 /*** this causes superfluous TIOCSPGRPS ***/
6648 #ifdef OLD_TTY_DRIVER
6649 if (ioctl(2, TIOCSPGRP, (char *)&pgrp) < 0)
6650 error("TIOCSPGRP failed, errno=%d", errno);
6652 if (tcsetpgrp(2, pgrp) < 0)
6653 error("tcsetpgrp failed, errno=%d", errno);
6658 } else if (mode == FORK_BG) {
6660 if (mode == FORK_BG) {
6664 if ((jp == NULL || jp->nprocs == 0) &&
6665 ! fd0_redirected_p ()) {
6667 if (open(devnull, O_RDONLY) != 0)
6668 error(nullerr, devnull);
6671 for (i = njobs, p = jobtab ; --i >= 0 ; p++)
6674 if (wasroot && iflag) {
6681 #ifdef CONFIG_ASH_JOB_CONTROL
6682 if (rootshell && mode != FORK_NOJOB && mflag) {
6683 if (jp == NULL || jp->nprocs == 0)
6686 pgrp = jp->ps[0].pid;
6690 if (mode == FORK_BG)
6691 backgndpid = pid; /* set $! */
6693 struct procstat *ps = &jp->ps[jp->nprocs++];
6697 if (iflag && rootshell && n)
6698 ps->cmd = commandtext(n);
6701 TRACE(("In parent shell: child = %d\n", pid));
6708 * Wait for job to finish.
6710 * Under job control we have the problem that while a child process is
6711 * running interrupts generated by the user are sent to the child but not
6712 * to the shell. This means that an infinite loop started by an inter-
6713 * active user may be hard to kill. With job control turned off, an
6714 * interactive user may place an interactive program inside a loop. If
6715 * the interactive program catches interrupts, the user doesn't want
6716 * these interrupts to also abort the loop. The approach we take here
6717 * is to have the shell ignore interrupt signals while waiting for a
6718 * forground process to terminate, and then send itself an interrupt
6719 * signal if the child process was terminated by an interrupt signal.
6720 * Unfortunately, some programs want to do a bit of cleanup and then
6721 * exit on interrupt; unless these processes terminate themselves by
6722 * sending a signal to themselves (instead of calling exit) they will
6723 * confuse this approach.
6727 waitforjob(struct job *jp)
6729 #ifdef CONFIG_ASH_JOB_CONTROL
6730 int mypgrp = getpgrp();
6734 struct sigaction act, oact;
6738 #ifdef CONFIG_ASH_JOB_CONTROL
6743 sigaction(SIGINT, 0, &act);
6744 act.sa_handler = waitonint;
6745 sigaction(SIGINT, &act, &oact);
6747 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
6748 while (jp->state == 0) {
6751 #ifdef CONFIG_ASH_JOB_CONTROL
6756 sigaction(SIGINT, &oact, 0);
6757 if (intreceived && trap[SIGINT]) kill(getpid(), SIGINT);
6759 #ifdef CONFIG_ASH_JOB_CONTROL
6761 #ifdef OLD_TTY_DRIVER
6762 if (ioctl(2, TIOCSPGRP, (char *)&mypgrp) < 0)
6763 error("TIOCSPGRP failed, errno=%d\n", errno);
6765 if (tcsetpgrp(2, mypgrp) < 0)
6766 error("tcsetpgrp failed, errno=%d\n", errno);
6769 if (jp->state == CONFIG_ASH_JOB_CONTROLTOPPED)
6770 curjob = jp - jobtab + 1;
6772 status = jp->ps[jp->nprocs - 1].status;
6773 /* convert to 8 bits */
6774 if (WIFEXITED(status))
6775 st = WEXITSTATUS(status);
6776 #ifdef CONFIG_ASH_JOB_CONTROL
6777 else if (WIFSTOPPED(status))
6778 st = WSTOPSIG(status) + 128;
6781 st = WTERMSIG(status) + 128;
6782 #ifdef CONFIG_ASH_JOB_CONTROL
6785 * This is truly gross.
6786 * If we're doing job control, then we did a TIOCSPGRP which
6787 * caused us (the shell) to no longer be in the controlling
6788 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
6789 * intuit from the subprocess exit status whether a SIGINT
6790 * occured, and if so interrupt ourselves. Yuck. - mycroft
6792 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
6795 if (jp->state == JOBDONE)
6806 * Wait for a process to terminate.
6810 * Do a wait system call. If job control is compiled in, we accept
6811 * stopped processes. If block is zero, we return a value of zero
6812 * rather than blocking.
6814 * System V doesn't have a non-blocking wait system call. It does
6815 * have a SIGCLD signal that is sent to a process when one of it's
6816 * children dies. The obvious way to use SIGCLD would be to install
6817 * a handler for SIGCLD which simply bumped a counter when a SIGCLD
6818 * was received, and have waitproc bump another counter when it got
6819 * the status of a process. Waitproc would then know that a wait
6820 * system call would not block if the two counters were different.
6821 * This approach doesn't work because if a process has children that
6822 * have not been waited for, System V will send it a SIGCLD when it
6823 * installs a signal handler for SIGCLD. What this means is that when
6824 * a child exits, the shell will be sent SIGCLD signals continuously
6825 * until is runs out of stack space, unless it does a wait call before
6826 * restoring the signal handler. The code below takes advantage of
6827 * this (mis)feature by installing a signal handler for SIGCLD and
6828 * then checking to see whether it was called. If there are any
6829 * children to be waited for, it will be.
6834 waitproc(int block, int *status)
6839 #ifdef CONFIG_ASH_JOB_CONTROL
6845 return wait3(status, flags, (struct rusage *)NULL);
6849 dowait(int block, struct job *job)
6853 struct procstat *sp;
6855 struct job *thisjob;
6861 TRACE(("dowait(%d) called\n", block));
6863 pid = waitproc(block, &status);
6864 TRACE(("wait returns %d, status=%d\n", pid, status));
6865 } while (!(block & 2) && pid == -1 && errno == EINTR);
6870 for (jp = jobtab ; jp < jobtab + njobs ; jp++) {
6874 for (sp = jp->ps ; sp < jp->ps + jp->nprocs ; sp++) {
6877 if (sp->pid == pid) {
6878 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n", pid, sp->status, status));
6879 sp->status = status;
6882 if (sp->status == -1)
6884 else if (WIFSTOPPED(sp->status))
6887 if (stopped) { /* stopped or done */
6888 int state = done? JOBDONE : CONFIG_ASH_JOB_CONTROLTOPPED;
6889 if (jp->state != state) {
6890 TRACE(("Job %d: changing state from %d to %d\n", jp - jobtab + 1, jp->state, state));
6892 #ifdef CONFIG_ASH_JOB_CONTROL
6893 if (done && curjob == jp - jobtab + 1)
6894 curjob = 0; /* no current job */
6901 if (! rootshell || ! iflag || (job && thisjob == job)) {
6902 core = WCOREDUMP(status);
6903 #ifdef CONFIG_ASH_JOB_CONTROL
6904 if (WIFSTOPPED(status)) sig = WSTOPSIG(status);
6907 if (WIFEXITED(status)) sig = 0;
6908 else sig = WTERMSIG(status);
6910 if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
6912 out2fmt("%d: ", pid);
6913 #ifdef CONFIG_ASH_JOB_CONTROL
6914 if (sig == SIGTSTP && rootshell && iflag)
6916 (long)(job - jobtab + 1));
6918 if (sig < NSIG && sys_siglist[sig])
6919 out2str(sys_siglist[sig]);
6921 out2fmt("Signal %d", sig);
6923 out2str(" - core dumped");
6926 TRACE(("Not printing status: status=%d, sig=%d\n",
6930 TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell, job));
6932 thisjob->changed = 1;
6941 * return 1 if there are stopped jobs, otherwise 0
6951 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
6954 if (jp->state == CONFIG_ASH_JOB_CONTROLTOPPED) {
6955 out2str("You have stopped jobs.\n");
6965 * Return a string identifying a command (to be printed by the
6969 static char *cmdnextc;
6970 static int cmdnleft;
6971 #define MAXCMDTEXT 200
6974 cmdputs(const char *s)
6985 while ((c = *p++) != '\0') {
6988 else if (c == CTLVAR) {
6993 } else if (c == '=' && subtype != 0) {
6994 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
6996 } else if (c == CTLENDVAR) {
6998 } else if (c == CTLBACKQ || c == CTLBACKQ+CTLQUOTE)
6999 cmdnleft++; /* ignore it */
7002 if (--cmdnleft <= 0) {
7012 #define CMDTXT_TABLE
7015 * To collect a lot of redundant code in cmdtxt() case statements, we
7016 * implement a mini language here. Each type of node struct has an
7017 * associated instruction sequence that operates on its members via
7018 * their offsets. The instruction are pack in unsigned chars with
7019 * format IIDDDDDE where the bits are
7020 * I : part of the instruction opcode, which are
7021 * 00 : member is a pointer to another node -- process it recursively
7022 * 40 : member is a pointer to a char string -- output it
7023 * 80 : output the string whose index is stored in the data field
7024 * CC : flag signaling that this case needs external processing
7025 * D : data - either the (shifted) index of a fixed string to output or
7026 * the actual offset of the member to operate on in the struct
7027 * (since we assume bit 0 is set, the offset is not shifted)
7028 * E : flag signaling end of instruction sequence
7030 * WARNING: In order to handle larger offsets for 64bit archs, this code
7031 * assumes that no offset can be an odd number and stores the
7032 * end-of-instructions flag in bit 0.
7035 #define CMDTXT_NOMORE 0x01 /* NOTE: no offset should be odd */
7036 #define CMDTXT_CHARPTR 0x40
7037 #define CMDTXT_STRING 0x80
7038 #define CMDTXT_SPECIAL 0xC0
7039 #define CMDTXT_OFFSETMASK 0x3E
7041 static const char * const cmdtxt_strings[] = {
7042 /* 0 1 2 3 4 5 6 7 */
7043 "; ", "(", ")", " && ", " || ", "if ", "; then ", "...",
7044 /* 8 9 10 11 12 13 */
7045 "while ", "; do ", "; done", "until ", "for ", " in ...",
7047 "case ", "???", "() ...", "<<..."
7050 static const char * const redir_strings[] = {
7051 ">", "<", "<>", ">>", ">|", ">&", "<&"
7054 static const unsigned char cmdtxt_ops[] = {
7055 #define CMDTXT_NSEMI 0
7056 offsetof(union node, nbinary.ch1),
7058 offsetof(union node, nbinary.ch2)|CMDTXT_NOMORE,
7059 #define CMDTXT_NCMD (CMDTXT_NSEMI + 3)
7060 #define CMDTXT_NPIPE (CMDTXT_NCMD)
7061 #define CMDTXT_NCASE (CMDTXT_NCMD)
7062 #define CMDTXT_NTO (CMDTXT_NCMD)
7063 #define CMDTXT_NFROM (CMDTXT_NCMD)
7064 #define CMDTXT_NFROMTO (CMDTXT_NCMD)
7065 #define CMDTXT_NAPPEND (CMDTXT_NCMD)
7066 #define CMDTXT_NTOOV (CMDTXT_NCMD)
7067 #define CMDTXT_NTOFD (CMDTXT_NCMD)
7068 #define CMDTXT_NFROMFD (CMDTXT_NCMD)
7070 #define CMDTXT_NREDIR (CMDTXT_NPIPE + 1)
7071 #define CMDTXT_NBACKGND (CMDTXT_NREDIR)
7072 offsetof(union node, nredir.n)|CMDTXT_NOMORE,
7073 #define CMDTXT_NSUBSHELL (CMDTXT_NBACKGND + 1)
7074 (1*2)|CMDTXT_STRING,
7075 offsetof(union node, nredir.n),
7076 (2*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7077 #define CMDTXT_NAND (CMDTXT_NSUBSHELL + 3)
7078 offsetof(union node, nbinary.ch1),
7079 (3*2)|CMDTXT_STRING,
7080 offsetof(union node, nbinary.ch2)|CMDTXT_NOMORE,
7081 #define CMDTXT_NOR (CMDTXT_NAND + 3)
7082 offsetof(union node, nbinary.ch1),
7083 (4*2)|CMDTXT_STRING,
7084 offsetof(union node, nbinary.ch2)|CMDTXT_NOMORE,
7085 #define CMDTXT_NIF (CMDTXT_NOR + 3)
7086 (5*2)|CMDTXT_STRING,
7087 offsetof(union node, nif.test),
7088 (6*2)|CMDTXT_STRING,
7089 offsetof(union node, nif.ifpart),
7090 (7*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7091 #define CMDTXT_NWHILE (CMDTXT_NIF + 5)
7092 (8*2)|CMDTXT_STRING,
7093 offsetof(union node, nbinary.ch1),
7094 (9*2)|CMDTXT_STRING,
7095 offsetof(union node, nbinary.ch2),
7096 (10*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7097 #define CMDTXT_NUNTIL (CMDTXT_NWHILE + 5)
7098 (11*2)|CMDTXT_STRING,
7099 offsetof(union node, nbinary.ch1),
7100 (9*2)|CMDTXT_STRING,
7101 offsetof(union node, nbinary.ch2),
7102 (10*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7103 #define CMDTXT_NFOR (CMDTXT_NUNTIL + 5)
7104 (12*2)|CMDTXT_STRING,
7105 offsetof(union node, nfor.var)|CMDTXT_CHARPTR,
7106 (13*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7107 #define CMDTXT_NCLIST (CMDTXT_NFOR + 3) /* TODO: IS THIS CORRECT??? */
7108 #define CMDTXT_NNOT (CMDTXT_NCLIST) /* TODO: IS THIS CORRECT??? */
7109 (15*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7110 #define CMDTXT_NDEFUN (CMDTXT_NCLIST + 1)
7111 offsetof(union node, narg.text)|CMDTXT_CHARPTR,
7112 (16*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7113 #define CMDTXT_NARG (CMDTXT_NDEFUN + 2)
7114 offsetof(union node, narg.text)|CMDTXT_CHARPTR|CMDTXT_NOMORE,
7115 #define CMDTXT_NHERE (CMDTXT_NARG + 1)
7116 #define CMDTXT_NXHERE (CMDTXT_NHERE)
7117 (17*2)|CMDTXT_STRING|CMDTXT_NOMORE,
7120 #if CMDTXT_NXHERE != 36
7121 #error CMDTXT_NXHERE
7124 static const unsigned char cmdtxt_ops_index[26] = {
7154 cmdtxt(const union node *n)
7161 p = cmdtxt_ops + (int) cmdtxt_ops_index[n->type];
7162 if ((*p & CMDTXT_SPECIAL) != CMDTXT_SPECIAL) { /* normal case */
7164 if (*p & CMDTXT_STRING) { /* output fixed string */
7165 cmdputs(cmdtxt_strings[((int)(*p & CMDTXT_OFFSETMASK) >> 1)]);
7167 const char *pf = ((const char *) n)
7168 + ((int)(*p & CMDTXT_OFFSETMASK));
7169 if (*p & CMDTXT_CHARPTR) { /* output dynamic string */
7170 cmdputs(*((const char **) pf));
7171 } else { /* output field */
7172 cmdtxt(*((const union node **) pf));
7175 } while (!(*p++ & CMDTXT_NOMORE));
7176 } else if (n->type == NCMD) {
7178 for (np = n->ncmd.args ; np ; np = np->narg.next) {
7183 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
7187 } else if (n->type == NPIPE) {
7188 struct nodelist *lp;
7189 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
7194 } else if (n->type == NCASE) {
7195 cmdputs(cmdtxt_strings[14]);
7196 cmdputs(n->ncase.expr->narg.text);
7197 cmdputs(cmdtxt_strings[13]);
7199 #if (NTO != 16) || (NFROM != 17) || (NFROMTO != 18) || (NAPPEND != 19) || (NTOOV != 20) || (NTOFD != 21) || (NFROMFD != 22)
7200 #error Assumption violated regarding range and ordering of NTO ... NFROMFD!
7205 assert((n->type >= NTO) && (n->type <= NFROMFD));
7208 p = redir_strings[n->type - NTO];
7209 if (n->nfile.fd != ('>' == *p)) {
7210 s[0] = n->nfile.fd + '0';
7215 if (n->type >= NTOFD) {
7216 s[0] = n->ndup.dupfd + '0';
7220 cmdtxt(n->nfile.fname);
7224 #else /* CMDTXT_TABLE */
7226 cmdtxt(const union node *n)
7229 struct nodelist *lp;
7238 cmdtxt(n->nbinary.ch1);
7240 cmdtxt(n->nbinary.ch2);
7243 cmdtxt(n->nbinary.ch1);
7245 cmdtxt(n->nbinary.ch2);
7248 cmdtxt(n->nbinary.ch1);
7250 cmdtxt(n->nbinary.ch2);
7253 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
7261 cmdtxt(n->nredir.n);
7266 cmdtxt(n->nredir.n);
7270 cmdtxt(n->nif.test);
7272 cmdtxt(n->nif.ifpart);
7281 cmdtxt(n->nbinary.ch1);
7283 cmdtxt(n->nbinary.ch2);
7288 cmdputs(n->nfor.var);
7293 cmdputs(n->ncase.expr->narg.text);
7297 cmdputs(n->narg.text);
7301 for (np = n->ncmd.args ; np ; np = np->narg.next) {
7306 for (np = n->ncmd.redirect ; np ; np = np->nfile.next) {
7312 cmdputs(n->narg.text);
7315 p = ">"; i = 1; goto redir;
7317 p = ">>"; i = 1; goto redir;
7319 p = ">&"; i = 1; goto redir;
7321 p = ">|"; i = 1; goto redir;
7323 p = "<"; i = 0; goto redir;
7325 p = "<&"; i = 0; goto redir;
7327 p = "<>"; i = 0; goto redir;
7329 if (n->nfile.fd != i) {
7330 s[0] = n->nfile.fd + '0';
7335 if (n->type == NTOFD || n->type == NFROMFD) {
7336 s[0] = n->ndup.dupfd + '0';
7340 cmdtxt(n->nfile.fname);
7352 #endif /* CMDTXT_TABLE */
7355 commandtext(const union node *n)
7359 cmdnextc = name = xmalloc(MAXCMDTEXT);
7360 cmdnleft = MAXCMDTEXT - 4;
7367 static void waitonint(int sig) {
7372 #ifdef CONFIG_ASH_MAIL
7375 * Routines to check for mail.
7379 #define MAXMBOXES 10
7382 static int nmboxes; /* number of mailboxes */
7383 static time_t mailtime[MAXMBOXES]; /* times of mailboxes */
7388 * Print appropriate message(s) if mail has arrived. If the argument is
7389 * nozero, then the value of MAIL has changed, so we just update the
7400 struct stackmark smark;
7407 setstackmark(&smark);
7408 mpath = mpathset()? mpathval() : mailval();
7409 for (i = 0 ; i < nmboxes ; i++) {
7410 p = padvance(&mpath, nullstr);
7415 for (q = p ; *q ; q++);
7420 q[-1] = '\0'; /* delete trailing '/' */
7421 if (stat(p, &statb) < 0)
7423 if (statb.st_size > mailtime[i] && ! silent) {
7425 pathopt? pathopt : "you have mail");
7427 mailtime[i] = statb.st_size;
7430 popstackmark(&smark);
7433 #endif /* CONFIG_ASH_MAIL */
7438 static short profile_buf[16384];
7442 static void read_profile (const char *);
7443 static void cmdloop (int);
7444 static void options (int);
7445 static void setoption (int, int);
7446 static void procargs (int, char **);
7450 * Main routine. We initialize things, parse the arguments, execute
7451 * profiles if we're a login shell, and then call cmdloop to execute
7452 * commands. The setjmp call sets up the location to jump to when an
7453 * exception occurs. When an exception occurs the variable "state"
7454 * is used to figure out how far we had gotten.
7458 ash_main(int argc, char **argv)
7460 struct jmploc jmploc;
7461 struct stackmark smark;
7465 BLTINCMD = find_builtin("builtin");
7466 EXECCMD = find_builtin("exec");
7467 EVALCMD = find_builtin("eval");
7469 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
7475 monitor(4, etext, profile_buf, sizeof profile_buf, 50);
7477 #if defined(linux) || defined(__GNU__)
7478 signal(SIGCHLD, SIG_DFL);
7481 if (setjmp(jmploc.loc)) {
7484 * When a shell procedure is executed, we raise the
7485 * exception EXSHELLPROC to clean up before executing
7486 * the shell procedure.
7488 if (exception == EXSHELLPROC) {
7494 if (exception == EXEXEC) {
7495 exitstatus = exerrno;
7496 } else if (exception == EXERROR) {
7499 if (state == 0 || iflag == 0 || ! rootshell)
7500 exitshell(exitstatus);
7503 if (exception == EXINT) {
7506 popstackmark(&smark);
7507 FORCEINTON; /* enable interrupts */
7510 else if (state == 2)
7512 else if (state == 3)
7520 trputs("Shell args: "); trargs(argv);
7525 setstackmark(&smark);
7526 procargs(argc, argv);
7527 if (argv[0] && argv[0][0] == '-') {
7529 read_profile("/etc/profile");
7532 read_profile(".profile");
7537 if (getuid() == geteuid() && getgid() == getegid()) {
7539 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
7541 read_profile(shinit);
7548 if (sflag == 0 || minusc) {
7549 static const char sigs[] = {
7550 SIGINT, SIGQUIT, SIGHUP,
7556 #define SIGSSIZE ((sizeof(sigs)/sizeof(sigs[0])) - 1) /* trailing nul */
7559 for (i = 0; i < SIGSSIZE; i++)
7564 evalstring(minusc, 0);
7566 if (sflag || minusc == NULL) {
7567 state4: /* XXX ??? - why isn't this before the "if" statement */
7573 exitshell(exitstatus);
7579 * Read and execute commands. "Top" is nonzero for the top level command
7580 * loop; it turns on prompting if the shell is interactive.
7587 struct stackmark smark;
7591 TRACE(("cmdloop(%d) called\n", top));
7592 setstackmark(&smark);
7600 #ifdef CONFIG_ASH_MAIL
7605 n = parsecmd(inter);
7606 /* showtree(n); DEBUG */
7608 if (!top || numeof >= 50)
7610 if (!stoppedjobs()) {
7613 out2str("\nUse \"exit\" to leave shell.\n");
7616 } else if (n != NULL && nflag == 0) {
7617 job_warning = (job_warning == 2) ? 1 : 0;
7621 popstackmark(&smark);
7622 setstackmark(&smark);
7623 if (evalskip == SKIPFILE) {
7628 popstackmark(&smark);
7634 * Read /etc/profile or .profile. Return on error.
7638 read_profile(const char *name)
7645 if ((fd = open(name, O_RDONLY)) >= 0)
7650 /* -q turns off -x and -v just when executing init files */
7651 /* Note: Might do a little redundant work, but reduces code size. */
7666 * Read a file containing shell functions.
7670 readcmdfile(const char *name)
7675 if ((fd = open(name, O_RDONLY)) >= 0)
7678 error("Can't open %s", name);
7687 * Take commands from a file. To be compatable we should do a path
7688 * search for the file, which is necessary to find sub-commands.
7691 static inline char *
7692 find_dot_file(char *mybasename)
7695 const char *path = pathval();
7698 /* don't try this for absolute or relative paths */
7699 if (strchr(mybasename, '/'))
7702 while ((fullname = padvance(&path, mybasename)) != NULL) {
7703 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
7705 * Don't bother freeing here, since it will
7706 * be freed by the caller.
7710 stunalloc(fullname);
7713 /* not found in the PATH */
7714 error("%s: not found", mybasename);
7719 dotcmd(int argc, char **argv)
7722 volatile struct shparam saveparam;
7725 for (sp = cmdenviron; sp ; sp = sp->next)
7726 setvareq(xstrdup(sp->text), VSTRFIXED|VTEXTFIXED);
7728 if (argc >= 2) { /* That's what SVR2 does */
7730 struct stackmark smark;
7732 setstackmark(&smark);
7733 fullname = find_dot_file(argv[1]);
7736 saveparam = shellparam;
7737 shellparam.malloc = 0;
7738 shellparam.nparam = argc - 2;
7739 shellparam.p = argv + 2;
7742 setinputfile(fullname, 1);
7743 commandname = fullname;
7748 freeparam(&shellparam);
7749 shellparam = saveparam;
7752 popstackmark(&smark);
7759 exitcmd(int argc, char **argv)
7764 exitstatus = number(argv[1]);
7766 exitstatus = oexitstatus;
7767 exitshell(exitstatus);
7776 nbytes = ALIGN(nbytes);
7777 if (nbytes > stacknleft) {
7779 struct stack_block *sp;
7782 if (blocksize < MINSIZE)
7783 blocksize = MINSIZE;
7785 sp = xmalloc(sizeof(struct stack_block) - MINSIZE + blocksize);
7787 stacknxt = sp->space;
7788 stacknleft = blocksize;
7794 stacknleft -= nbytes;
7800 stunalloc(pointer p)
7803 if (p == NULL) { /*DEBUG */
7804 write(2, "stunalloc\n", 10);
7808 if (!(stacknxt >= (char *)p && (char *)p >= stackp->space)) {
7811 stacknleft += stacknxt - (char *)p;
7817 setstackmark(struct stackmark *mark)
7819 mark->stackp = stackp;
7820 mark->stacknxt = stacknxt;
7821 mark->stacknleft = stacknleft;
7822 mark->marknext = markp;
7828 popstackmark(struct stackmark *mark)
7830 struct stack_block *sp;
7833 markp = mark->marknext;
7834 while (stackp != mark->stackp) {
7839 stacknxt = mark->stacknxt;
7840 stacknleft = mark->stacknleft;
7846 * When the parser reads in a string, it wants to stick the string on the
7847 * stack and only adjust the stack pointer when it knows how big the
7848 * string is. Stackblock (defined in stack.h) returns a pointer to a block
7849 * of space on top of the stack and stackblocklen returns the length of
7850 * this block. Growstackblock will grow this space by at least one byte,
7851 * possibly moving it (like realloc). Grabstackblock actually allocates the
7852 * part of the block that has been used.
7856 growstackblock(void) {
7858 int newlen = ALIGN(stacknleft * 2 + 100);
7859 char *oldspace = stacknxt;
7860 int oldlen = stacknleft;
7861 struct stack_block *sp;
7862 struct stack_block *oldstackp;
7864 if (stacknxt == stackp->space && stackp != &stackbase) {
7869 sp = xrealloc((pointer)sp, sizeof(struct stack_block) - MINSIZE + newlen);
7872 stacknxt = sp->space;
7873 stacknleft = newlen;
7875 /* Stack marks pointing to the start of the old block
7876 * must be relocated to point to the new block
7878 struct stackmark *xmark;
7880 while (xmark != NULL && xmark->stackp == oldstackp) {
7881 xmark->stackp = stackp;
7882 xmark->stacknxt = stacknxt;
7883 xmark->stacknleft = stacknleft;
7884 xmark = xmark->marknext;
7889 p = stalloc(newlen);
7890 memcpy(p, oldspace, oldlen);
7891 stacknxt = p; /* free the space */
7892 stacknleft += newlen; /* we just allocated */
7899 grabstackblock(int len)
7909 * The following routines are somewhat easier to use that the above.
7910 * The user declares a variable of type STACKSTR, which may be declared
7911 * to be a register. The macro STARTSTACKSTR initializes things. Then
7912 * the user uses the macro STPUTC to add characters to the string. In
7913 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
7914 * grown as necessary. When the user is done, she can just leave the
7915 * string there and refer to it using stackblock(). Or she can allocate
7916 * the space for it using grabstackstr(). If it is necessary to allow
7917 * someone else to use the stack temporarily and then continue to grow
7918 * the string, the user should use grabstack to allocate the space, and
7919 * then call ungrabstr(p) to return to the previous mode of operation.
7921 * USTPUTC is like STPUTC except that it doesn't check for overflow.
7922 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
7923 * is space for at least one character.
7928 growstackstr(void) {
7929 int len = stackblocksize();
7930 if (herefd >= 0 && len >= 1024) {
7931 xwrite(herefd, stackblock(), len);
7932 sstrnleft = len - 1;
7933 return stackblock();
7936 sstrnleft = stackblocksize() - len - 1;
7937 return stackblock() + len;
7942 * Called from CHECKSTRSPACE.
7946 makestrspace(size_t newlen) {
7947 int len = stackblocksize() - sstrnleft;
7950 sstrnleft = stackblocksize() - len;
7951 } while (sstrnleft < newlen);
7952 return stackblock() + len;
7958 ungrabstackstr(char *s, char *p)
7960 stacknleft += stacknxt - s;
7962 sstrnleft = stacknleft - (p - s);
7965 * Miscelaneous builtins.
7971 #if !defined(__GLIBC__) || __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
7972 typedef long rlim_t;
7978 * The read builtin. The -e option causes backslashes to escape the
7979 * following character.
7981 * This uses unbuffered input, which may be avoidable in some cases.
7985 readcmd(int argc, char **argv)
8000 while ((i = nextopt("p:r")) != '\0') {
8006 if (prompt && isatty(0)) {
8007 out2str(prompt); /* read without cmdedit */
8010 if (*(ap = argptr) == NULL)
8012 if ((ifs = bltinlookup("IFS")) == NULL)
8019 if (read(0, &c, 1) != 1) {
8031 if (!rflag && c == '\\') {
8037 if (startword && *ifs == ' ' && strchr(ifs, c)) {
8041 if (backslash && c == '\\') {
8042 if (read(0, &c, 1) != 1) {
8047 } else if (ap[1] != NULL && strchr(ifs, c) != NULL) {
8049 setvar(*ap, stackblock(), 0);
8058 /* Remove trailing blanks */
8059 while (stackblock() <= --p && strchr(ifs, *p) != NULL)
8061 setvar(*ap, stackblock(), 0);
8062 while (*++ap != NULL)
8063 setvar(*ap, nullstr, 0);
8070 umaskcmd(int argc, char **argv)
8072 static const char permuser[3] = "ugo";
8073 static const char permmode[3] = "rwx";
8074 static const short int permmask[] = {
8075 S_IRUSR, S_IWUSR, S_IXUSR,
8076 S_IRGRP, S_IWGRP, S_IXGRP,
8077 S_IROTH, S_IWOTH, S_IXOTH
8083 int symbolic_mode = 0;
8085 while (nextopt("S") != '\0') {
8094 if ((ap = *argptr) == NULL) {
8095 if (symbolic_mode) {
8098 for (i=0 ; i<3 ; i++) {
8102 for (j=0 ; j<3 ; j++) {
8103 if ((mask & permmask[3*i+j]) == 0) {
8112 printf("%.4o\n", mask);
8115 if (is_digit((unsigned char)*ap)) {
8118 if (*ap >= '8' || *ap < '0')
8119 error("Illegal number: %s", argv[1]);
8120 mask = (mask << 3) + (*ap - '0');
8121 } while (*++ap != '\0');
8124 mask = ~mask & 0777;
8125 if (! parse_mode(ap, &mask)) {
8126 error("Illegal mode: %s", ap);
8128 umask(~mask & 0777);
8137 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
8138 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
8139 * ash by J.T. Conklin.
8147 short factor; /* multiply by to get rlim_{cur,max} values */
8150 static const struct limits limits[] = {
8152 { "time(seconds)", RLIMIT_CPU, 1 },
8155 { "file(blocks)", RLIMIT_FSIZE, 512 },
8158 { "data(kbytes)", RLIMIT_DATA, 1024 },
8161 { "stack(kbytes)", RLIMIT_STACK, 1024 },
8164 { "coredump(blocks)", RLIMIT_CORE, 512 },
8167 { "memory(kbytes)", RLIMIT_RSS, 1024 },
8169 #ifdef RLIMIT_MEMLOCK
8170 { "locked memory(kbytes)", RLIMIT_MEMLOCK, 1024 },
8173 { "process(processes)", RLIMIT_NPROC, 1 },
8175 #ifdef RLIMIT_NOFILE
8176 { "nofiles(descriptors)", RLIMIT_NOFILE, 1 },
8179 { "vmemory(kbytes)", RLIMIT_VMEM, 1024 },
8182 { "swap(kbytes)", RLIMIT_SWAP, 1024 },
8188 ulimitcmd(int argc, char **argv)
8190 static const char unlimited_string[] = "unlimited";
8193 enum { SOFT = 0x1, HARD = 0x2 }
8195 const struct limits *l;
8198 struct rlimit limit;
8202 while ((optc = nextopt("HSa"
8221 #ifdef RLIMIT_MEMLOCK
8227 #ifdef RLIMIT_NOFILE
8239 } else if (optc == 'S') {
8241 } else if (optc == 'a') {
8248 for (l = limits; l->name; l++) {
8249 if(l->name[0] == what)
8251 if(l->name[1]=='w' && what=='w')
8255 set = *argptr ? 1 : 0;
8259 if (all || argptr[1])
8260 error("too many arguments");
8261 if (strcmp(p, unlimited_string) == 0)
8262 val = RLIM_INFINITY;
8266 while ((c = *p++) >= '0' && c <= '9')
8268 val = (val * 10) + (long)(c - '0');
8269 if (val < (rlim_t) 0)
8273 error("bad number");
8279 for (l = limits; l->name; l++) {
8280 printf("%-20s ", l->name);
8281 getrlimit(l->cmd, &limit);
8284 val = limit.rlim_cur;
8285 else if (how & HARD)
8286 val = limit.rlim_max;
8288 if (val == RLIM_INFINITY)
8289 puts(unlimited_string);
8293 printf("%lld\n", (long long) val);
8306 getrlimit(l->cmd, &limit);
8308 limit.rlim_max = val;
8310 limit.rlim_cur = val;
8311 if (setrlimit(l->cmd, &limit) < 0)
8312 error("error setting limit (%m)");
8316 * prefix -- see if pfx is a prefix of string.
8320 prefix(char const *pfx, char const *string)
8323 if (*pfx++ != *string++)
8330 * Return true if s is a string of digits, and save munber in intptr
8335 is_number(const char *p, int *intptr)
8343 ret += digit_val(*p);
8345 } while (*p != '\0');
8352 * Convert a string of digits to an integer, printing an error message on
8357 number(const char *s)
8360 if (! is_number(s, &i))
8361 error("Illegal number: %s", s);
8366 * Produce a possibly single quoted string suitable as input to the shell.
8367 * The return string is allocated on the stack.
8371 single_quote(const char *s)
8379 size_t len1, len1p, len2, len2p;
8381 len1 = strcspn(s, "'");
8382 len2 = strspn(s + len1, "'");
8384 len1p = len1 ? len1 + 2 : len1;
8385 len2p = len2 + ((len2 < 2) ? len2 : 2);
8387 CHECKSTRSPACE(len1p + len2p + 1, p);
8392 memcpy(p + 1, s, len1);
8400 memcpy(q + 1, s, len2);
8403 } else if (len2 == 1) {
8409 STADJUST(len1p + len2p, p);
8414 return grabstackstr(p);
8418 * Like strdup but works with the ash stack.
8422 sstrdup(const char *p)
8424 size_t len = strlen(p) + 1;
8425 return memcpy(stalloc(len), p, len);
8430 * Routine for dealing with parsed shell commands.
8434 static void sizenodelist (const struct nodelist *);
8435 static struct nodelist *copynodelist (const struct nodelist *);
8436 static char *nodexstrdup (const char *);
8438 #define CALCSIZE_TABLE
8439 #define COPYNODE_TABLE
8440 #if defined(CALCSIZE_TABLE) || defined(COPYNODE_TABLE)
8442 * To collect a lot of redundant code in case statements for copynode()
8443 * and calcsize(), we implement a mini language here. Each type of node
8444 * struct has an associated instruction sequence that operates on its
8445 * members via their offsets. The instruction are pack in unsigned chars
8446 * with format IIDDDDDE where the bits are
8447 * I : part of the instruction opcode, which are
8448 * 00 : member is a pointer to another node
8449 * 40 : member is an integer
8450 * 80 : member is a pointer to a nodelist
8451 * CC : member is a pointer to a char string
8452 * D : data - the actual offset of the member to operate on in the struct
8453 * (since we assume bit 0 is set, it is not shifted)
8454 * E : flag signaling end of instruction sequence
8456 * WARNING: In order to handle larger offsets for 64bit archs, this code
8457 * assumes that no offset can be an odd number and stores the
8458 * end-of-instructions flag in bit 0.
8461 #define NODE_INTEGER 0x40
8462 #define NODE_NODELIST 0x80
8463 #define NODE_CHARPTR 0xC0
8464 #define NODE_NOMORE 0x01 /* Note: no offset should be odd (aligned)*/
8465 #define NODE_MBRMASK 0xC0
8466 #define NODE_OFFSETMASK 0x3E
8468 static const unsigned char copynode_ops[35] = {
8469 #define COPYNODE_OPS0 0
8470 offsetof(union node, nbinary.ch2),
8471 offsetof(union node, nbinary.ch1)|NODE_NOMORE,
8472 #define COPYNODE_OPS1 (COPYNODE_OPS0 + 2)
8473 offsetof(union node, ncmd.redirect),
8474 offsetof(union node, ncmd.args),
8475 offsetof(union node, ncmd.assign),
8476 offsetof(union node, ncmd.backgnd)|NODE_INTEGER|NODE_NOMORE,
8477 #define COPYNODE_OPS2 (COPYNODE_OPS1 + 4)
8478 offsetof(union node, npipe.cmdlist)|NODE_NODELIST,
8479 offsetof(union node, npipe.backgnd)|NODE_INTEGER|NODE_NOMORE,
8480 #define COPYNODE_OPS3 (COPYNODE_OPS2 + 2)
8481 offsetof(union node, nredir.redirect),
8482 offsetof(union node, nredir.n)|NODE_NOMORE,
8483 #define COPYNODE_OPS4 (COPYNODE_OPS3 + 2)
8484 offsetof(union node, nif.elsepart),
8485 offsetof(union node, nif.ifpart),
8486 offsetof(union node, nif.test)|NODE_NOMORE,
8487 #define COPYNODE_OPS5 (COPYNODE_OPS4 + 3)
8488 offsetof(union node, nfor.var)|NODE_CHARPTR,
8489 offsetof(union node, nfor.body),
8490 offsetof(union node, nfor.args)|NODE_NOMORE,
8491 #define COPYNODE_OPS6 (COPYNODE_OPS5 + 3)
8492 offsetof(union node, ncase.cases),
8493 offsetof(union node, ncase.expr)|NODE_NOMORE,
8494 #define COPYNODE_OPS7 (COPYNODE_OPS6 + 2)
8495 offsetof(union node, nclist.body),
8496 offsetof(union node, nclist.pattern),
8497 offsetof(union node, nclist.next)|NODE_NOMORE,
8498 #define COPYNODE_OPS8 (COPYNODE_OPS7 + 3)
8499 offsetof(union node, narg.backquote)|NODE_NODELIST,
8500 offsetof(union node, narg.text)|NODE_CHARPTR,
8501 offsetof(union node, narg.next)|NODE_NOMORE,
8502 #define COPYNODE_OPS9 (COPYNODE_OPS8 + 3)
8503 offsetof(union node, nfile.fname),
8504 offsetof(union node, nfile.fd)|NODE_INTEGER,
8505 offsetof(union node, nfile.next)|NODE_NOMORE,
8506 #define COPYNODE_OPS10 (COPYNODE_OPS9 + 3)
8507 offsetof(union node, ndup.vname),
8508 offsetof(union node, ndup.dupfd)|NODE_INTEGER,
8509 offsetof(union node, ndup.fd)|NODE_INTEGER,
8510 offsetof(union node, ndup.next)|NODE_NOMORE,
8511 #define COPYNODE_OPS11 (COPYNODE_OPS10 + 4)
8512 offsetof(union node, nhere.doc),
8513 offsetof(union node, nhere.fd)|NODE_INTEGER,
8514 offsetof(union node, nhere.next)|NODE_NOMORE,
8515 #define COPYNODE_OPS12 (COPYNODE_OPS11 + 3)
8516 offsetof(union node, nnot.com)|NODE_NOMORE,
8519 #if COPYNODE_OPS12 != 34
8520 #error COPYNODE_OPS12 is incorrect
8523 static const unsigned char copynode_ops_index[26] = {
8524 COPYNODE_OPS0, /* NSEMI */
8525 COPYNODE_OPS1, /* NCMD */
8526 COPYNODE_OPS2, /* NPIPE */
8527 COPYNODE_OPS3, /* NREDIR */
8528 COPYNODE_OPS3, /* NBACKGND */
8529 COPYNODE_OPS3, /* NSUBSHELL */
8530 COPYNODE_OPS0, /* NAND */
8531 COPYNODE_OPS0, /* NOR */
8532 COPYNODE_OPS4, /* NIF */
8533 COPYNODE_OPS0, /* NWHILE */
8534 COPYNODE_OPS0, /* NUNTIL */
8535 COPYNODE_OPS5, /* NFOR */
8536 COPYNODE_OPS6, /* NCASE */
8537 COPYNODE_OPS7, /* NCLIST */
8538 COPYNODE_OPS8, /* NDEFUN */
8539 COPYNODE_OPS8, /* NARG */
8540 COPYNODE_OPS9, /* NTO */
8541 COPYNODE_OPS9, /* NFROM */
8542 COPYNODE_OPS9, /* NFROMTO */
8543 COPYNODE_OPS9, /* NAPPEND */
8544 COPYNODE_OPS9, /* NTOOV */
8545 COPYNODE_OPS10, /* NTOFD */
8546 COPYNODE_OPS10, /* NFROMFD */
8547 COPYNODE_OPS11, /* NHERE */
8548 COPYNODE_OPS11, /* NXHERE */
8549 COPYNODE_OPS12, /* NNOT */
8552 #if NODE_CHARPTR != NODE_MBRMASK
8553 #error NODE_CHARPTR != NODE_MBRMASK!!!
8555 #endif /* defined(CALCSIZE_TABLE) || defined(COPYNODE_TABLE) */
8557 #ifdef COPYNODE_TABLE
8559 copynode(const union node *n)
8562 const unsigned char *p;
8568 new->type = n->type;
8569 funcblock = (char *) funcblock + (int) nodesize[n->type];
8570 p = copynode_ops + (int) copynode_ops_index[n->type];
8572 char *nn = ((char *) new) + ((int)(*p & NODE_OFFSETMASK));
8573 const char *no = ((const char *) n) + ((int)(*p & NODE_OFFSETMASK));
8575 if (!(*p & NODE_MBRMASK)) { /* standard node */
8576 *((union node **)nn) = copynode(*((const union node **) no));
8577 } else if ((*p & NODE_MBRMASK) == NODE_CHARPTR) { /* string */
8578 *((const char **)nn) = nodexstrdup(*((const char **)no));
8579 } else if (*p & NODE_NODELIST) { /* nodelist */
8580 *((struct nodelist **)nn)
8581 = copynodelist(*((const struct nodelist **) no));
8582 } else { /* integer */
8583 *((int *) nn) = *((int *) no);
8585 } while (!(*p++ & NODE_NOMORE));
8588 #else /* COPYNODE_TABLE */
8590 copynode(const union node *n)
8597 funcblock = (char *) funcblock + nodesize[n->type];
8604 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8605 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8608 new->ncmd.redirect = copynode(n->ncmd.redirect);
8609 new->ncmd.args = copynode(n->ncmd.args);
8610 new->ncmd.assign = copynode(n->ncmd.assign);
8611 new->ncmd.backgnd = n->ncmd.backgnd;
8614 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8615 new->npipe.backgnd = n->npipe.backgnd;
8620 new->nredir.redirect = copynode(n->nredir.redirect);
8621 new->nredir.n = copynode(n->nredir.n);
8624 new->nif.elsepart = copynode(n->nif.elsepart);
8625 new->nif.ifpart = copynode(n->nif.ifpart);
8626 new->nif.test = copynode(n->nif.test);
8629 new->nfor.var = nodexstrdup(n->nfor.var);
8630 new->nfor.body = copynode(n->nfor.body);
8631 new->nfor.args = copynode(n->nfor.args);
8634 new->ncase.cases = copynode(n->ncase.cases);
8635 new->ncase.expr = copynode(n->ncase.expr);
8638 new->nclist.body = copynode(n->nclist.body);
8639 new->nclist.pattern = copynode(n->nclist.pattern);
8640 new->nclist.next = copynode(n->nclist.next);
8644 new->narg.backquote = copynodelist(n->narg.backquote);
8645 new->narg.text = nodexstrdup(n->narg.text);
8646 new->narg.next = copynode(n->narg.next);
8653 new->nfile.fname = copynode(n->nfile.fname);
8654 new->nfile.fd = n->nfile.fd;
8655 new->nfile.next = copynode(n->nfile.next);
8659 new->ndup.vname = copynode(n->ndup.vname);
8660 new->ndup.dupfd = n->ndup.dupfd;
8661 new->ndup.fd = n->ndup.fd;
8662 new->ndup.next = copynode(n->ndup.next);
8666 new->nhere.doc = copynode(n->nhere.doc);
8667 new->nhere.fd = n->nhere.fd;
8668 new->nhere.next = copynode(n->nhere.next);
8671 new->nnot.com = copynode(n->nnot.com);
8674 new->type = n->type;
8677 #endif /* COPYNODE_TABLE */
8679 #ifdef CALCSIZE_TABLE
8681 calcsize(const union node *n)
8683 const unsigned char *p;
8687 funcblocksize += (int) nodesize[n->type];
8689 p = copynode_ops + (int) copynode_ops_index[n->type];
8691 const char *no = ((const char *) n) + ((int)(*p & NODE_OFFSETMASK));
8693 if (!(*p & NODE_MBRMASK)) { /* standard node */
8694 calcsize(*((const union node **) no));
8695 } else if ((*p & NODE_MBRMASK) == NODE_CHARPTR) { /* string */
8696 funcstringsize += strlen(*((const char **)no)) + 1;
8697 } else if (*p & NODE_NODELIST) { /* nodelist */
8698 sizenodelist(*((const struct nodelist **) no));
8699 } /* else integer -- ignore */
8700 } while (!(*p++ & NODE_NOMORE));
8702 #else /* CALCSIZE_TABLE */
8704 calcsize(const union node *n)
8708 funcblocksize += nodesize[n->type];
8715 calcsize(n->nbinary.ch2);
8716 calcsize(n->nbinary.ch1);
8719 calcsize(n->ncmd.redirect);
8720 calcsize(n->ncmd.args);
8721 calcsize(n->ncmd.assign);
8724 sizenodelist(n->npipe.cmdlist);
8729 calcsize(n->nredir.redirect);
8730 calcsize(n->nredir.n);
8733 calcsize(n->nif.elsepart);
8734 calcsize(n->nif.ifpart);
8735 calcsize(n->nif.test);
8738 funcstringsize += strlen(n->nfor.var) + 1;
8739 calcsize(n->nfor.body);
8740 calcsize(n->nfor.args);
8743 calcsize(n->ncase.cases);
8744 calcsize(n->ncase.expr);
8747 calcsize(n->nclist.body);
8748 calcsize(n->nclist.pattern);
8749 calcsize(n->nclist.next);
8753 sizenodelist(n->narg.backquote);
8754 funcstringsize += strlen(n->narg.text) + 1;
8755 calcsize(n->narg.next);
8762 calcsize(n->nfile.fname);
8763 calcsize(n->nfile.next);
8767 calcsize(n->ndup.vname);
8768 calcsize(n->ndup.next);
8772 calcsize(n->nhere.doc);
8773 calcsize(n->nhere.next);
8776 calcsize(n->nnot.com);
8780 #endif /* CALCSIZE_TABLE */
8783 sizenodelist(const struct nodelist *lp)
8786 funcblocksize += ALIGN(sizeof(struct nodelist));
8793 static struct nodelist *
8794 copynodelist(const struct nodelist *lp)
8796 struct nodelist *start;
8797 struct nodelist **lpp;
8802 funcblock = (char *) funcblock + ALIGN(sizeof(struct nodelist));
8803 (*lpp)->n = copynode(lp->n);
8805 lpp = &(*lpp)->next;
8813 nodexstrdup(const char *s)
8816 char *q = funcstring;
8817 char *rtn = funcstring;
8819 while ((*q++ = *p++) != '\0')
8825 #ifdef CONFIG_ASH_GETOPTS
8826 static int getopts (char *, char *, char **, int *, int *);
8831 * Process the shell command line arguments.
8835 procargs(int argc, char **argv)
8842 for (i = 0; i < NOPTS; i++)
8845 if (*argptr == NULL && minusc == NULL)
8847 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
8851 for (i = 0; i < NOPTS; i++)
8852 if (optent_val(i) == 2)
8855 if (sflag == 0 && minusc == NULL) {
8856 commandname = argv[0];
8858 setinputfile(arg0, 0);
8861 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
8862 if (argptr && minusc && *argptr)
8865 shellparam.p = argptr;
8866 shellparam.optind = 1;
8867 shellparam.optoff = -1;
8868 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
8870 shellparam.nparam++;
8879 * Process shell options. The global variable argptr contains a pointer
8880 * to the argument list; we advance it past the options.
8884 minus_o(const char *name, int val)
8889 out1str("Current option settings\n");
8890 for (i = 0; i < NOPTS; i++)
8891 printf("%-16s%s\n", optent_name(optlist[i]),
8892 optent_val(i) ? "on" : "off");
8894 for (i = 0; i < NOPTS; i++)
8895 if (equal(name, optent_name(optlist[i]))) {
8896 setoption(optent_letter(optlist[i]), val);
8899 error("Illegal option -o %s", name);
8905 options(int cmdline)
8913 while ((p = *argptr) != NULL) {
8915 if ((c = *p++) == '-') {
8917 if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
8919 /* "-" means turn off -x and -v */
8922 /* "--" means reset params */
8923 else if (*argptr == NULL)
8926 break; /* "-" or "--" terminates options */
8928 } else if (c == '+') {
8934 while ((c = *p++) != '\0') {
8935 if (c == 'c' && cmdline) {
8937 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
8941 if (q == NULL || minusc != NULL)
8942 error("Bad -c option");
8947 } else if (c == 'o') {
8948 minus_o(*argptr, val);
8960 setoption(int flag, int val)
8964 for (i = 0; i < NOPTS; i++)
8965 if (optent_letter(optlist[i]) == flag) {
8966 optent_val(i) = val;
8968 /* #%$ hack for ksh semantics */
8971 else if (flag == 'E')
8976 error("Illegal option -%c", flag);
8983 * Set the shell parameters.
8987 setparam(char **argv)
8993 for (nparam = 0 ; argv[nparam] ; nparam++);
8994 ap = newparam = xmalloc((nparam + 1) * sizeof *ap);
8996 *ap++ = xstrdup(*argv++);
8999 freeparam(&shellparam);
9000 shellparam.malloc = 1;
9001 shellparam.nparam = nparam;
9002 shellparam.p = newparam;
9003 shellparam.optind = 1;
9004 shellparam.optoff = -1;
9009 * Free the list of positional parameters.
9013 freeparam(volatile struct shparam *param)
9017 if (param->malloc) {
9018 for (ap = param->p ; *ap ; ap++)
9027 * The shift builtin command.
9031 shiftcmd(int argc, char **argv)
9038 n = number(argv[1]);
9039 if (n > shellparam.nparam)
9040 error("can't shift that many");
9042 shellparam.nparam -= n;
9043 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
9044 if (shellparam.malloc)
9048 while ((*ap2++ = *ap1++) != NULL);
9049 shellparam.optind = 1;
9050 shellparam.optoff = -1;
9058 * The set command builtin.
9062 setcmd(int argc, char **argv)
9065 return showvarscmd(argc, argv);
9069 if (*argptr != NULL) {
9078 getoptsreset(const char *value)
9080 shellparam.optind = number(value);
9081 shellparam.optoff = -1;
9084 #ifdef CONFIG_LOCALE_SUPPORT
9085 static void change_lc_all(const char *value)
9087 if(value != 0 && *value != 0)
9088 setlocale(LC_ALL, value);
9091 static void change_lc_ctype(const char *value)
9093 if(value != 0 && *value != 0)
9094 setlocale(LC_CTYPE, value);
9099 #ifdef CONFIG_ASH_GETOPTS
9101 * The getopts builtin. Shellparam.optnext points to the next argument
9102 * to be processed. Shellparam.optptr points to the next character to
9103 * be processed in the current argument. If shellparam.optnext is NULL,
9104 * then it's the first time getopts has been called.
9108 getoptscmd(int argc, char **argv)
9113 error("Usage: getopts optstring var [arg]");
9114 else if (argc == 3) {
9115 optbase = shellparam.p;
9116 if (shellparam.optind > shellparam.nparam + 1) {
9117 shellparam.optind = 1;
9118 shellparam.optoff = -1;
9123 if (shellparam.optind > argc - 2) {
9124 shellparam.optind = 1;
9125 shellparam.optoff = -1;
9129 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
9130 &shellparam.optoff);
9134 * Safe version of setvar, returns 1 on success 0 on failure.
9138 setvarsafe(const char *name, const char *val, int flags)
9140 struct jmploc jmploc;
9141 struct jmploc *volatile savehandler = handler;
9147 if (setjmp(jmploc.loc))
9151 setvar(name, val, flags);
9153 handler = savehandler;
9158 getopts(char *optstr, char *optvar, char **optfirst, int *myoptind, int *optoff)
9165 char **optnext = optfirst + *myoptind - 1;
9167 if (*myoptind <= 1 || *optoff < 0 || !(*(optnext - 1)) ||
9168 strlen(*(optnext - 1)) < *optoff)
9171 p = *(optnext - 1) + *optoff;
9172 if (p == NULL || *p == '\0') {
9173 /* Current word is done, advance */
9174 if (optnext == NULL)
9177 if (p == NULL || *p != '-' || *++p == '\0') {
9179 *myoptind = optnext - optfirst + 1;
9185 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
9190 for (q = optstr; *q != c; ) {
9192 if (optstr[0] == ':') {
9195 err |= setvarsafe("OPTARG", s, 0);
9198 out2fmt("Illegal option -%c\n", c);
9199 (void) unsetvar("OPTARG");
9209 if (*p == '\0' && (p = *optnext) == NULL) {
9210 if (optstr[0] == ':') {
9213 err |= setvarsafe("OPTARG", s, 0);
9217 out2fmt("No arg for -%c option\n", c);
9218 (void) unsetvar("OPTARG");
9226 setvarsafe("OPTARG", p, 0);
9230 setvarsafe("OPTARG", "", 0);
9231 *myoptind = optnext - optfirst + 1;
9238 *optoff = p ? p - *(optnext - 1) : -1;
9239 snprintf(s, sizeof(s), "%d", *myoptind);
9240 err |= setvarsafe("OPTIND", s, VNOFUNC);
9243 err |= setvarsafe(optvar, s, 0);
9254 * XXX - should get rid of. have all builtins use getopt(3). the
9255 * library getopt must have the BSD extension static variable "optreset"
9256 * otherwise it can't be used within the shell safely.
9258 * Standard option processing (a la getopt) for builtin routines. The
9259 * only argument that is passed to nextopt is the option string; the
9260 * other arguments are unnecessary. It return the character, or '\0' on
9265 nextopt(const char *optstring)
9271 if ((p = optptr) == NULL || *p == '\0') {
9273 if (p == NULL || *p != '-' || *++p == '\0')
9276 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
9280 for (q = optstring ; *q != c ; ) {
9282 error("Illegal option -%c", c);
9287 if (*p == '\0' && (p = *argptr++) == NULL)
9288 error("No arg for -%c option", c);
9305 out2fmt(const char *fmt, ...)
9309 vfprintf(stderr, fmt, ap);
9314 * Version of write which resumes after a signal is caught.
9318 xwrite(int fd, const char *buf, int nbytes)
9327 i = write(fd, buf, n);
9333 } else if (i == 0) {
9336 } else if (errno != EINTR) {
9344 * Shell command parser.
9347 #define EOFMARKLEN 79
9352 struct heredoc *next; /* next here document in list */
9353 union node *here; /* redirection node */
9354 char *eofmark; /* string indicating end of input */
9355 int striptabs; /* if set, strip leading tabs */
9358 static struct heredoc *heredoclist; /* list of here documents to read */
9359 static int parsebackquote; /* nonzero if we are inside backquotes */
9360 static int doprompt; /* if set, prompt the user */
9361 static int needprompt; /* true if interactive and at start of line */
9362 static int lasttoken; /* last token read */
9364 static char *wordtext; /* text of last word returned by readtoken */
9366 static struct nodelist *backquotelist;
9367 static union node *redirnode;
9368 static struct heredoc *heredoc;
9369 static int quoteflag; /* set if (part of) last token was quoted */
9370 static int startlinno; /* line # where last token started */
9373 static union node *list (int);
9374 static union node *andor (void);
9375 static union node *pipeline (void);
9376 static union node *command (void);
9377 static union node *simplecmd(union node **rpp, union node *redir);
9378 static void parsefname (void);
9379 static void parseheredoc (void);
9380 static char peektoken (void);
9381 static int readtoken (void);
9382 static int xxreadtoken (void);
9383 static int readtoken1 (int, int, const char *, int);
9384 static int noexpand (char *);
9385 static void synexpect (int) __attribute__((noreturn));
9386 static void synerror (const char *) __attribute__((noreturn));
9387 static void setprompt (int);
9391 * Read and parse a command. Returns NEOF on end of file. (NULL is a
9392 * valid parse tree indicating a blank line.)
9396 parsecmd(int interact)
9401 doprompt = interact;
9420 union node *n1, *n2, *n3;
9424 if (nlflag == 0 && peektoken())
9430 if (tok == TBACKGND) {
9431 if (n2->type == NCMD || n2->type == NPIPE) {
9432 n2->ncmd.backgnd = 1;
9433 } else if (n2->type == NREDIR) {
9434 n2->type = NBACKGND;
9436 n3 = (union node *)stalloc(sizeof (struct nredir));
9437 n3->type = NBACKGND;
9439 n3->nredir.redirect = NULL;
9447 n3 = (union node *)stalloc(sizeof (struct nbinary));
9449 n3->nbinary.ch1 = n1;
9450 n3->nbinary.ch2 = n2;
9474 pungetc(); /* push back EOF on input */
9489 union node *n1, *n2, *n3;
9495 if ((t = readtoken()) == TAND) {
9497 } else if (t == TOR) {
9505 n3 = (union node *)stalloc(sizeof (struct nbinary));
9507 n3->nbinary.ch1 = n1;
9508 n3->nbinary.ch2 = n2;
9517 union node *n1, *n2, *pipenode;
9518 struct nodelist *lp, *prev;
9522 TRACE(("pipeline: entered\n"));
9523 if (readtoken() == TNOT) {
9529 if (readtoken() == TPIPE) {
9530 pipenode = (union node *)stalloc(sizeof (struct npipe));
9531 pipenode->type = NPIPE;
9532 pipenode->npipe.backgnd = 0;
9533 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
9534 pipenode->npipe.cmdlist = lp;
9538 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
9542 } while (readtoken() == TPIPE);
9548 n2 = (union node *)stalloc(sizeof (struct nnot));
9560 union node *n1, *n2;
9561 union node *ap, **app;
9562 union node *cp, **cpp;
9563 union node *redir, **rpp;
9570 /* Check for redirection which may precede command */
9571 while (readtoken() == TREDIR) {
9572 *rpp = n2 = redirnode;
9573 rpp = &n2->nfile.next;
9578 switch (readtoken()) {
9580 n1 = (union node *)stalloc(sizeof (struct nif));
9582 n1->nif.test = list(0);
9583 if (readtoken() != TTHEN)
9585 n1->nif.ifpart = list(0);
9587 while (readtoken() == TELIF) {
9588 n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
9589 n2 = n2->nif.elsepart;
9591 n2->nif.test = list(0);
9592 if (readtoken() != TTHEN)
9594 n2->nif.ifpart = list(0);
9596 if (lasttoken == TELSE)
9597 n2->nif.elsepart = list(0);
9599 n2->nif.elsepart = NULL;
9602 if (readtoken() != TFI)
9609 n1 = (union node *)stalloc(sizeof (struct nbinary));
9610 n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
9611 n1->nbinary.ch1 = list(0);
9612 if ((got=readtoken()) != TDO) {
9613 TRACE(("expecting DO got %s %s\n", tokname(got), got == TWORD ? wordtext : ""));
9616 n1->nbinary.ch2 = list(0);
9617 if (readtoken() != TDONE)
9623 if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
9624 synerror("Bad for loop variable");
9625 n1 = (union node *)stalloc(sizeof (struct nfor));
9627 n1->nfor.var = wordtext;
9629 if (readtoken() == TIN) {
9631 while (readtoken() == TWORD) {
9632 n2 = (union node *)stalloc(sizeof (struct narg));
9634 n2->narg.text = wordtext;
9635 n2->narg.backquote = backquotelist;
9637 app = &n2->narg.next;
9641 if (lasttoken != TNL && lasttoken != TSEMI)
9644 static char argvars[5] = {CTLVAR, VSNORMAL|VSQUOTE,
9646 n2 = (union node *)stalloc(sizeof (struct narg));
9648 n2->narg.text = argvars;
9649 n2->narg.backquote = NULL;
9650 n2->narg.next = NULL;
9653 * Newline or semicolon here is optional (but note
9654 * that the original Bourne shell only allowed NL).
9656 if (lasttoken != TNL && lasttoken != TSEMI)
9660 if (readtoken() != TDO)
9662 n1->nfor.body = list(0);
9663 if (readtoken() != TDONE)
9668 n1 = (union node *)stalloc(sizeof (struct ncase));
9670 if (readtoken() != TWORD)
9672 n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
9674 n2->narg.text = wordtext;
9675 n2->narg.backquote = backquotelist;
9676 n2->narg.next = NULL;
9679 } while (readtoken() == TNL);
9680 if (lasttoken != TIN)
9681 synerror("expecting \"in\"");
9682 cpp = &n1->ncase.cases;
9683 checkkwd = 2, readtoken();
9685 if (lasttoken == TLP)
9687 *cpp = cp = (union node *)stalloc(sizeof (struct nclist));
9689 app = &cp->nclist.pattern;
9691 *app = ap = (union node *)stalloc(sizeof (struct narg));
9693 ap->narg.text = wordtext;
9694 ap->narg.backquote = backquotelist;
9695 if (checkkwd = 2, readtoken() != TPIPE)
9697 app = &ap->narg.next;
9700 ap->narg.next = NULL;
9701 if (lasttoken != TRP)
9703 cp->nclist.body = list(0);
9706 if ((t = readtoken()) != TESAC) {
9708 synexpect(TENDCASE);
9710 checkkwd = 2, readtoken();
9712 cpp = &cp->nclist.next;
9713 } while(lasttoken != TESAC);
9718 n1 = (union node *)stalloc(sizeof (struct nredir));
9719 n1->type = NSUBSHELL;
9720 n1->nredir.n = list(0);
9721 n1->nredir.redirect = NULL;
9722 if (readtoken() != TRP)
9728 if (readtoken() != TEND)
9732 /* Handle an empty command like other simple commands. */
9741 * An empty command before a ; doesn't make much sense, and
9742 * should certainly be disallowed in the case of `if ;'.
9748 n1 = simplecmd(rpp, redir);
9755 /* Now check for redirection which may follow command */
9756 while (readtoken() == TREDIR) {
9757 *rpp = n2 = redirnode;
9758 rpp = &n2->nfile.next;
9764 if (n1->type != NSUBSHELL) {
9765 n2 = (union node *)stalloc(sizeof (struct nredir));
9770 n1->nredir.redirect = redir;
9778 simplecmd(union node **rpp, union node *redir) {
9779 union node *args, **app;
9780 union node *n = NULL;
9781 union node *vars, **vpp;
9782 union node **orig_rpp;
9789 /* If we don't have any redirections already, then we must reset
9790 rpp to be the address of the local redir variable. */
9793 /* We save the incoming value, because we need this for shell
9794 functions. There can not be a redirect or an argument between
9795 the function name and the open parenthesis. */
9800 switch (readtoken()) {
9803 n = (union node *)stalloc(sizeof (struct narg));
9805 n->narg.text = wordtext;
9806 n->narg.backquote = backquotelist;
9807 if (lasttoken == TWORD) {
9809 app = &n->narg.next;
9812 vpp = &n->narg.next;
9816 *rpp = n = redirnode;
9817 rpp = &n->nfile.next;
9818 parsefname(); /* read name of redirection file */
9822 args && app == &args->narg.next &&
9823 !vars && rpp == orig_rpp
9825 /* We have a function */
9826 if (readtoken() != TRP)
9830 n->narg.next = command();
9843 n = (union node *)stalloc(sizeof (struct ncmd));
9845 n->ncmd.backgnd = 0;
9846 n->ncmd.args = args;
9847 n->ncmd.assign = vars;
9848 n->ncmd.redirect = redir;
9856 n = (union node *)stalloc(sizeof (struct narg));
9858 n->narg.next = NULL;
9859 n->narg.text = wordtext;
9860 n->narg.backquote = backquotelist;
9864 static void fixredir(union node *n, const char *text, int err)
9866 TRACE(("Fix redir %s %d\n", text, err));
9868 n->ndup.vname = NULL;
9870 if (is_digit(text[0]) && text[1] == '\0')
9871 n->ndup.dupfd = digit_val(text[0]);
9872 else if (text[0] == '-' && text[1] == '\0')
9877 synerror("Bad fd number");
9879 n->ndup.vname = makename();
9886 union node *n = redirnode;
9888 if (readtoken() != TWORD)
9890 if (n->type == NHERE) {
9891 struct heredoc *here = heredoc;
9897 TRACE(("Here document %d\n", n->type));
9898 if (here->striptabs) {
9899 while (*wordtext == '\t')
9902 if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
9903 synerror("Illegal eof marker for << redirection");
9904 rmescapes(wordtext);
9905 here->eofmark = wordtext;
9907 if (heredoclist == NULL)
9910 for (p = heredoclist ; p->next ; p = p->next);
9913 } else if (n->type == NTOFD || n->type == NFROMFD) {
9914 fixredir(n, wordtext, 0);
9916 n->nfile.fname = makename();
9922 * Input any here documents.
9927 struct heredoc *here;
9930 while (heredoclist) {
9932 heredoclist = here->next;
9937 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
9938 here->eofmark, here->striptabs);
9939 n = (union node *)stalloc(sizeof (struct narg));
9940 n->narg.type = NARG;
9941 n->narg.next = NULL;
9942 n->narg.text = wordtext;
9943 n->narg.backquote = backquotelist;
9944 here->here->nhere.doc = n;
9954 return tokname_array[t][0];
9961 #ifdef CONFIG_ASH_ALIAS
9962 int savecheckalias = checkalias;
9963 int savecheckkwd = checkkwd;
9968 int alreadyseen = tokpushback;
9971 #ifdef CONFIG_ASH_ALIAS
9977 #ifdef CONFIG_ASH_ALIAS
9978 checkalias = savecheckalias;
9985 if (checkkwd == 2) {
9994 * check for keywords
9996 if (t == TWORD && !quoteflag)
9998 const char *const *pp;
10000 if ((pp = findkwd(wordtext))) {
10001 lasttoken = t = pp - tokname_array;
10002 TRACE(("keyword %s recognized\n", tokname(t)));
10013 } else if (checkalias == 2 && isassignment(wordtext)) {
10014 lasttoken = t = TASSIGN;
10015 #ifdef CONFIG_ASH_ALIAS
10016 } else if (checkalias) {
10017 if (!quoteflag && (ap = *__lookupalias(wordtext)) != NULL && !(ap->flag & ALIASINUSE)) {
10019 pushstring(ap->val, strlen(ap->val), ap);
10021 checkkwd = savecheckkwd;
10030 TRACE(("token %s %s\n", tokname(t), t == TWORD || t == TASSIGN ? wordtext : ""));
10032 TRACE(("reread token %s %s\n", tokname(t), t == TWORD || t == TASSIGN ? wordtext : ""));
10039 * Read the next input token.
10040 * If the token is a word, we set backquotelist to the list of cmds in
10041 * backquotes. We set quoteflag to true if any part of the word was
10043 * If the token is TREDIR, then we set redirnode to a structure containing
10045 * In all cases, the variable startlinno is set to the number of the line
10046 * on which the token starts.
10048 * [Change comment: here documents and internal procedures]
10049 * [Readtoken shouldn't have any arguments. Perhaps we should make the
10050 * word parsing code into a separate routine. In this case, readtoken
10051 * doesn't need to have any internal procedures, but parseword does.
10052 * We could also make parseoperator in essence the main routine, and
10053 * have parseword (readtoken1?) handle both words and redirection.]
10056 #define NEW_xxreadtoken
10057 #ifdef NEW_xxreadtoken
10059 static const char xxreadtoken_chars[] = "\n()&|;"; /* singles must be first! */
10060 static const char xxreadtoken_tokens[] = {
10061 TNL, TLP, TRP, /* only single occurrence allowed */
10062 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
10063 TEOF, /* corresponds to trailing nul */
10064 TAND, TOR, TENDCASE, /* if double occurrence */
10067 #define xxreadtoken_doubles \
10068 (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
10069 #define xxreadtoken_singles \
10070 (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
10084 startlinno = plinno;
10085 for (;;) { /* until token or start of word found */
10088 if ((c!=' ') && (c!='\t')
10089 #ifdef CONFIG_ASH_ALIAS
10094 while ((c = pgetc()) != '\n' && c != PEOF);
10096 } else if (c=='\\') {
10097 if (pgetc() != '\n') {
10101 startlinno = ++plinno;
10102 setprompt(doprompt ? 2 : 0);
10105 = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
10110 needprompt = doprompt;
10113 p = strchr(xxreadtoken_chars, c);
10116 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
10119 if (p-xxreadtoken_chars >= xxreadtoken_singles) {
10120 if (pgetc() == *p) { /* double occurrence? */
10121 p += xxreadtoken_doubles + 1;
10128 return lasttoken = xxreadtoken_tokens[p-xxreadtoken_chars];
10136 #define RETURN(token) return lasttoken = token
10150 startlinno = plinno;
10151 for (;;) { /* until token or start of word found */
10154 case ' ': case '\t':
10155 #ifdef CONFIG_ASH_ALIAS
10160 while ((c = pgetc()) != '\n' && c != PEOF);
10164 if (pgetc() == '\n') {
10165 startlinno = ++plinno;
10176 needprompt = doprompt;
10181 if (pgetc() == '&')
10186 if (pgetc() == '|')
10191 if (pgetc() == ';')
10204 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
10210 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10211 * is not NULL, read a here document. In the latter case, eofmark is the
10212 * word which marks the end of the document and striptabs is true if
10213 * leading tabs should be stripped from the document. The argument firstc
10214 * is the first character of the input token or document.
10216 * Because C does not have internal subroutines, I have simulated them
10217 * using goto's to implement the subroutine linkage. The following macros
10218 * will run code that appears at the end of readtoken1.
10221 #define CHECKEND() {goto checkend; checkend_return:;}
10222 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10223 #define PARSESUB() {goto parsesub; parsesub_return:;}
10224 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10225 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10226 #define PARSEARITH() {goto parsearith; parsearith_return:;}
10229 readtoken1(int firstc, int syntax, const char *eofmark, int striptabs)
10234 char line[EOFMARKLEN + 1];
10235 struct nodelist *bqlist;
10238 int varnest; /* levels of variables expansion */
10239 int arinest; /* levels of arithmetic expansion */
10240 int parenlevel; /* levels of parens in arithmetic */
10241 int dqvarnest; /* levels of variables expansion within double quotes */
10243 int prevsyntax; /* syntax before arithmetic */
10245 /* Avoid longjmp clobbering */
10251 (void) &parenlevel;
10254 (void) &prevsyntax;
10258 startlinno = plinno;
10260 if (syntax == DQSYNTAX)
10269 STARTSTACKSTR(out);
10270 loop: { /* for each line, until end of word */
10271 CHECKEND(); /* set c to PEOF if at end of here document */
10272 for (;;) { /* until end of line or end of word */
10273 CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */
10274 switch(SIT(c,syntax)) {
10275 case CNL: /* '\n' */
10276 if (syntax == BASESYNTAX)
10277 goto endword; /* exit outer loop */
10285 goto loop; /* continue outer loop */
10290 if ((eofmark == NULL || dblquote) &&
10292 USTPUTC(CTLESC, out);
10295 case CBACK: /* backslash */
10298 USTPUTC('\\', out);
10300 } else if (c == '\n') {
10306 if (dblquote && c != '\\' && c != '`' && c != '$'
10307 && (c != '"' || eofmark != NULL))
10308 USTPUTC('\\', out);
10309 if (SIT(c,SQSYNTAX) == CCTL)
10310 USTPUTC(CTLESC, out);
10311 else if (eofmark == NULL)
10312 USTPUTC(CTLQUOTEMARK, out);
10318 if (eofmark == NULL)
10319 USTPUTC(CTLQUOTEMARK, out);
10323 if (eofmark == NULL)
10324 USTPUTC(CTLQUOTEMARK, out);
10329 if (eofmark != NULL && arinest == 0 &&
10334 syntax = ARISYNTAX;
10336 } else if (eofmark == NULL &&
10338 syntax = BASESYNTAX;
10344 case CVAR: /* '$' */
10345 PARSESUB(); /* parse substitution */
10347 case CENDVAR: /* '}' */
10350 if (dqvarnest > 0) {
10353 USTPUTC(CTLENDVAR, out);
10358 #ifdef CONFIG_ASH_MATH_SUPPORT
10359 case CLP: /* '(' in arithmetic */
10363 case CRP: /* ')' in arithmetic */
10364 if (parenlevel > 0) {
10368 if (pgetc() == ')') {
10369 if (--arinest == 0) {
10370 USTPUTC(CTLENDARI, out);
10371 syntax = prevsyntax;
10372 if (syntax == DQSYNTAX)
10380 * unbalanced parens
10381 * (don't 2nd guess - no error)
10389 case CBQUOTE: /* '`' */
10393 goto endword; /* exit outer loop */
10398 goto endword; /* exit outer loop */
10399 #ifdef CONFIG_ASH_ALIAS
10409 if (syntax == ARISYNTAX)
10410 synerror("Missing '))'");
10411 if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
10412 synerror("Unterminated quoted string");
10413 if (varnest != 0) {
10414 startlinno = plinno;
10415 synerror("Missing '}'");
10417 USTPUTC('\0', out);
10418 len = out - stackblock();
10419 out = stackblock();
10420 if (eofmark == NULL) {
10421 if ((c == '>' || c == '<')
10424 && (*out == '\0' || is_digit(*out))) {
10426 return lasttoken = TREDIR;
10431 quoteflag = quotef;
10432 backquotelist = bqlist;
10433 grabstackblock(len);
10435 return lasttoken = TWORD;
10436 /* end of readtoken routine */
10441 * Check to see whether we are at the end of the here document. When this
10442 * is called, c is set to the first character of the next input line. If
10443 * we are at the end of the here document, this routine sets the c to PEOF.
10448 #ifdef CONFIG_ASH_ALIAS
10454 while (c == '\t') {
10458 if (c == *eofmark) {
10459 if (pfgets(line, sizeof line) != NULL) {
10463 for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
10464 if (*p == '\n' && *q == '\0') {
10467 needprompt = doprompt;
10469 pushstring(line, strlen(line), NULL);
10474 goto checkend_return;
10479 * Parse a redirection operator. The variable "out" points to a string
10480 * specifying the fd to be redirected. The variable "c" contains the
10481 * first character of the redirection operator.
10488 np = (union node *)stalloc(sizeof (struct nfile));
10493 np->type = NAPPEND;
10502 } else { /* c == '<' */
10504 switch (c = pgetc()) {
10506 if (sizeof (struct nfile) != sizeof (struct nhere)) {
10507 np = (union node *)stalloc(sizeof (struct nhere));
10511 heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
10512 heredoc->here = np;
10513 if ((c = pgetc()) == '-') {
10514 heredoc->striptabs = 1;
10516 heredoc->striptabs = 0;
10522 np->type = NFROMFD;
10526 np->type = NFROMTO;
10536 np->nfile.fd = digit_val(fd);
10538 goto parseredir_return;
10543 * Parse a substitution. At this point, we have read the dollar sign
10544 * and nothing else.
10552 static const char types[] = "}-+?=";
10557 (c != '(' && c != '{' && !is_name(c) && !is_special(c))
10561 } else if (c == '(') { /* $(command) or $((arith)) */
10562 if (pgetc() == '(') {
10569 USTPUTC(CTLVAR, out);
10570 typeloc = out - stackblock();
10571 USTPUTC(VSNORMAL, out);
10572 subtype = VSNORMAL;
10576 if ((c = pgetc()) == '}')
10579 subtype = VSLENGTH;
10584 if (c > PEOA && is_name(c)) {
10588 } while (c > PEOA && is_in_name(c));
10589 } else if (is_digit(c)) {
10593 } while (is_digit(c));
10595 else if (is_special(c)) {
10600 badsub: synerror("Bad substitution");
10604 if (subtype == 0) {
10611 p = strchr(types, c);
10614 subtype = p - types + VSNORMAL;
10620 subtype = c == '#' ? VSTRIMLEFT :
10633 if (dblquote || arinest)
10635 *(stackblock() + typeloc) = subtype | flags;
10636 if (subtype != VSNORMAL) {
10643 goto parsesub_return;
10648 * Called to parse command substitutions. Newstyle is set if the command
10649 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
10650 * list of commands (passed by reference), and savelen is the number of
10651 * characters on the top of the stack which must be preserved.
10655 struct nodelist **nlpp;
10658 char *volatile str;
10659 struct jmploc jmploc;
10660 struct jmploc *volatile savehandler;
10664 (void) &saveprompt;
10667 savepbq = parsebackquote;
10668 if (setjmp(jmploc.loc)) {
10671 parsebackquote = 0;
10672 handler = savehandler;
10673 longjmp(handler->loc, 1);
10677 savelen = out - stackblock();
10679 str = xmalloc(savelen);
10680 memcpy(str, stackblock(), savelen);
10682 savehandler = handler;
10686 /* We must read until the closing backquote, giving special
10687 treatment to some slashes, and then push the string and
10688 reread it as input, interpreting it normally. */
10695 STARTSTACKSTR(pout);
10701 switch (pc = pgetc()) {
10706 if ((pc = pgetc()) == '\n') {
10713 * If eating a newline, avoid putting
10714 * the newline into the new character
10715 * stream (via the STPUTC after the
10720 if (pc != '\\' && pc != '`' && pc != '$'
10721 && (!dblquote || pc != '"'))
10722 STPUTC('\\', pout);
10729 #ifdef CONFIG_ASH_ALIAS
10732 startlinno = plinno;
10733 synerror("EOF in backquote substitution");
10737 needprompt = doprompt;
10746 STPUTC('\0', pout);
10747 psavelen = pout - stackblock();
10748 if (psavelen > 0) {
10749 pstr = grabstackstr(pout);
10750 setinputstring(pstr);
10755 nlpp = &(*nlpp)->next;
10756 *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
10757 (*nlpp)->next = NULL;
10758 parsebackquote = oldstyle;
10761 saveprompt = doprompt;
10768 doprompt = saveprompt;
10770 if (readtoken() != TRP)
10777 * Start reading from old file again, ignoring any pushed back
10778 * tokens left from the backquote parsing
10783 while (stackblocksize() <= savelen)
10785 STARTSTACKSTR(out);
10787 memcpy(out, str, savelen);
10788 STADJUST(savelen, out);
10794 parsebackquote = savepbq;
10795 handler = savehandler;
10796 if (arinest || dblquote)
10797 USTPUTC(CTLBACKQ | CTLQUOTE, out);
10799 USTPUTC(CTLBACKQ, out);
10801 goto parsebackq_oldreturn;
10803 goto parsebackq_newreturn;
10807 * Parse an arithmetic expansion (indicate start of one and set state)
10811 if (++arinest == 1) {
10812 prevsyntax = syntax;
10813 syntax = ARISYNTAX;
10814 USTPUTC(CTLARI, out);
10821 * we collapse embedded arithmetic expansion to
10822 * parenthesis, which should be equivalent
10826 goto parsearith_return;
10829 } /* end of readtoken */
10833 * Returns true if the text contains nothing to expand (no dollar signs
10838 noexpand(char *text)
10844 while ((c = *p++) != '\0') {
10845 if (c == CTLQUOTEMARK)
10849 else if (SIT(c,BASESYNTAX) == CCTL)
10857 * Return true if the argument is a legal variable name (a letter or
10858 * underscore followed by zero or more letters, underscores, and digits).
10862 goodname(const char *name)
10870 if (! is_in_name(*p))
10878 * Called when an unexpected token is read during the parse. The argument
10879 * is the token that is expected, or -1 if more than one type of token can
10880 * occur at this point.
10884 synexpect(int token)
10889 l = sprintf(msg, "%s unexpected", tokname(lasttoken));
10891 sprintf(msg+l, " (expecting %s)", tokname(token));
10898 synerror(const char *msg)
10901 out2fmt("%s: %d: ", commandname, startlinno);
10902 out2fmt("Syntax error: %s\n", msg);
10903 error((char *)NULL);
10909 * called by editline -- any expansions to the prompt
10910 * should be added here.
10913 setprompt(int whichprompt)
10916 switch (whichprompt) {
10931 * Code for dealing with input/output redirection.
10934 #define EMPTY -2 /* marks an unused slot in redirtab */
10936 # define PIPESIZE 4096 /* amount of buffering in a pipe */
10938 # define PIPESIZE PIPE_BUF
10943 * Open a file in noclobber mode.
10944 * The code was copied from bash.
10947 noclobberopen(const char *fname)
10950 struct stat finfo, finfo2;
10953 * If the file exists and is a regular file, return an error
10956 r = stat(fname, &finfo);
10957 if (r == 0 && S_ISREG(finfo.st_mode)) {
10963 * If the file was not present (r != 0), make sure we open it
10964 * exclusively so that if it is created before we open it, our open
10965 * will fail. Make sure that we do not truncate an existing file.
10966 * Note that we don't turn on O_EXCL unless the stat failed -- if the
10967 * file was not a regular file, we leave O_EXCL off.
10970 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
10971 fd = open(fname, O_WRONLY|O_CREAT, 0666);
10973 /* If the open failed, return the file descriptor right away. */
10978 * OK, the open succeeded, but the file may have been changed from a
10979 * non-regular file to a regular file between the stat and the open.
10980 * We are assuming that the O_EXCL open handles the case where FILENAME
10981 * did not exist and is symlinked to an existing file between the stat
10986 * If we can open it and fstat the file descriptor, and neither check
10987 * revealed that it was a regular file, and the file has not been
10988 * replaced, return the file descriptor.
10990 if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) &&
10991 finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
10994 /* The file has been replaced. badness. */
11001 * Handle here documents. Normally we fork off a process to write the
11002 * data to a pipe. If the document is short, we can stuff the data in
11003 * the pipe without forking.
11007 openhere(const union node *redir)
11013 error("Pipe call failed");
11014 if (redir->type == NHERE) {
11015 len = strlen(redir->nhere.doc->narg.text);
11016 if (len <= PIPESIZE) {
11017 xwrite(pip[1], redir->nhere.doc->narg.text, len);
11021 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
11023 signal(SIGINT, SIG_IGN);
11024 signal(SIGQUIT, SIG_IGN);
11025 signal(SIGHUP, SIG_IGN);
11027 signal(SIGTSTP, SIG_IGN);
11029 signal(SIGPIPE, SIG_DFL);
11030 if (redir->type == NHERE)
11031 xwrite(pip[1], redir->nhere.doc->narg.text, len);
11033 expandhere(redir->nhere.doc, pip[1]);
11043 openredirect(const union node *redir)
11048 switch (redir->nfile.type) {
11050 fname = redir->nfile.expfname;
11051 if ((f = open(fname, O_RDONLY)) < 0)
11055 fname = redir->nfile.expfname;
11056 if ((f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
11060 /* Take care of noclobber mode. */
11062 fname = redir->nfile.expfname;
11063 if ((f = noclobberopen(fname)) < 0)
11068 fname = redir->nfile.expfname;
11070 if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
11073 if ((f = creat(fname, 0666)) < 0)
11078 fname = redir->nfile.expfname;
11080 if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
11083 if ((f = open(fname, O_WRONLY)) < 0
11084 && (f = creat(fname, 0666)) < 0)
11086 lseek(f, (off_t)0, 2);
11093 /* Fall through to eliminate warning. */
11100 f = openhere(redir);
11106 error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
11108 error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
11113 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
11114 * old file descriptors are stashed away so that the redirection can be
11115 * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
11116 * standard output, and the standard error if it becomes a duplicate of
11121 redirect(union node *redir, int flags)
11124 struct redirtab *sv = NULL;
11129 int fd1dup = flags & REDIR_BACKQ;; /* stdout `cmd` redir to pipe */
11131 if (flags & REDIR_PUSH) {
11132 sv = xmalloc(sizeof (struct redirtab));
11133 for (i = 0 ; i < 10 ; i++)
11134 sv->renamed[i] = EMPTY;
11135 sv->next = redirlist;
11138 for (n = redir ; n ; n = n->nfile.next) {
11141 if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) &&
11142 n->ndup.dupfd == fd)
11143 continue; /* redirect from/to same file descriptor */
11146 newfd = openredirect(n);
11147 if ((flags & REDIR_PUSH) && sv->renamed[fd] == EMPTY) {
11150 } else if ((i = fcntl(fd, F_DUPFD, 10)) == -1) {
11154 dupredirect(n, newfd, fd1dup);
11164 error("%d: %m", fd);
11170 if (flags & REDIR_PUSH) {
11171 sv->renamed[fd] = i;
11174 } else if (fd != newfd) {
11180 dupredirect(n, newfd, fd1dup);
11187 dupredirect(const union node *redir, int f, int fd1dup)
11189 int fd = redir->nfile.fd;
11193 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
11194 if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
11195 if (redir->ndup.dupfd!=1 || fd1dup!=1)
11196 dup_as_newfd(redir->ndup.dupfd, fd);
11202 dup_as_newfd(f, fd);
11211 * Undo the effects of the last redirection.
11217 struct redirtab *rp = redirlist;
11221 for (i = 0 ; i < 10 ; i++) {
11222 if (rp->renamed[i] != EMPTY) {
11226 if (rp->renamed[i] >= 0) {
11227 dup_as_newfd(rp->renamed[i], i);
11228 close(rp->renamed[i]);
11232 redirlist = rp->next;
11238 * Discard all saved file descriptors.
11243 struct redirtab *rp;
11246 for (rp = redirlist ; rp ; rp = rp->next) {
11247 for (i = 0 ; i < 10 ; i++) {
11248 if (rp->renamed[i] >= 0) {
11249 close(rp->renamed[i]);
11251 rp->renamed[i] = EMPTY;
11258 * Copy a file descriptor to be >= to. Returns -1
11259 * if the source file descriptor is closed, EMPTY if there are no unused
11260 * file descriptors left.
11264 dup_as_newfd(int from, int to)
11268 newfd = fcntl(from, F_DUPFD, to);
11270 if (errno == EMFILE)
11273 error("%d: %m", from);
11282 static void shtree (union node *, int, char *, FILE*);
11283 static void shcmd (union node *, FILE *);
11284 static void sharg (union node *, FILE *);
11285 static void indent (int, char *, FILE *);
11286 static void trstring (char *);
11293 trputs("showtree called\n");
11294 shtree(n, 1, NULL, stdout);
11299 shtree(union node *n, int ind, char *pfx, FILE *fp)
11301 struct nodelist *lp;
11307 indent(ind, pfx, fp);
11318 shtree(n->nbinary.ch1, ind, NULL, fp);
11321 shtree(n->nbinary.ch2, ind, NULL, fp);
11329 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
11334 if (n->npipe.backgnd)
11340 fprintf(fp, "<node type %d>", n->type);
11350 shcmd(union node *cmd, FILE *fp)
11358 for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
11364 for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
11370 if ((np->nfile.type <= NFROMFD) && (np->nfile.type >= NTO)) {
11371 s = redir_strings[np->nfile.type - NTO];
11377 switch (np->nfile.type) {
11378 case NTO: s = ">"; dftfd = 1; break;
11379 case NAPPEND: s = ">>"; dftfd = 1; break;
11380 case NTOFD: s = ">&"; dftfd = 1; break;
11381 case NTOOV: s = ">|"; dftfd = 1; break;
11382 case NFROM: s = "<"; dftfd = 0; break;
11383 case NFROMFD: s = "<&"; dftfd = 0; break;
11384 case NFROMTO: s = "<>"; dftfd = 0; break;
11385 default: s = "*error*"; dftfd = 0; break;
11388 if (np->nfile.fd != dftfd)
11389 fprintf(fp, "%d", np->nfile.fd);
11391 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
11392 fprintf(fp, "%d", np->ndup.dupfd);
11394 sharg(np->nfile.fname, fp);
11401 sharg(union node *arg, FILE *fp)
11404 struct nodelist *bqlist;
11407 if (arg->type != NARG) {
11408 printf("<node type %d>\n", arg->type);
11412 bqlist = arg->narg.backquote;
11413 for (p = arg->narg.text ; *p ; p++) {
11422 if (subtype == VSLENGTH)
11428 if (subtype & VSNUL)
11431 switch (subtype & VSTYPE) {
11450 case VSTRIMLEFTMAX:
11457 case VSTRIMRIGHTMAX:
11464 printf("<subtype %d>", subtype);
11471 case CTLBACKQ|CTLQUOTE:
11474 shtree(bqlist->n, -1, NULL, fp);
11486 indent(int amount, char *pfx, FILE *fp)
11490 for (i = 0 ; i < amount ; i++) {
11491 if (pfx && i == amount - 1)
11501 static int debug = 1;
11503 static int debug = 0;
11510 if (tracefile == NULL)
11512 putc(c, tracefile);
11518 trace(const char *fmt, ...)
11522 if (tracefile != NULL) {
11523 (void) vfprintf(tracefile, fmt, va);
11524 if (strchr(fmt, '\n'))
11525 (void) fflush(tracefile);
11532 trputs(const char *s)
11534 if (tracefile == NULL)
11536 fputs(s, tracefile);
11537 if (strchr(s, '\n'))
11548 if (tracefile == NULL)
11550 putc('"', tracefile);
11551 for (p = s ; *p ; p++) {
11553 case '\n': c = 'n'; goto backslash;
11554 case '\t': c = 't'; goto backslash;
11555 case '\r': c = 'r'; goto backslash;
11556 case '"': c = '"'; goto backslash;
11557 case '\\': c = '\\'; goto backslash;
11558 case CTLESC: c = 'e'; goto backslash;
11559 case CTLVAR: c = 'v'; goto backslash;
11560 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
11561 case CTLBACKQ: c = 'q'; goto backslash;
11562 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
11563 backslash: putc('\\', tracefile);
11564 putc(c, tracefile);
11567 if (*p >= ' ' && *p <= '~')
11568 putc(*p, tracefile);
11570 putc('\\', tracefile);
11571 putc(*p >> 6 & 03, tracefile);
11572 putc(*p >> 3 & 07, tracefile);
11573 putc(*p & 07, tracefile);
11578 putc('"', tracefile);
11585 if (tracefile == NULL)
11590 putc(' ', tracefile);
11592 putc('\n', tracefile);
11608 #ifdef not_this_way
11611 if ((p = getenv("HOME")) == NULL) {
11612 if (geteuid() == 0)
11618 strcat(s, "/trace");
11621 strcpy(s, "./trace");
11622 #endif /* not_this_way */
11623 if ((tracefile = wfopen(s, "a")) == NULL)
11626 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
11627 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
11629 fputs("\nTracing started.\n", tracefile);
11636 * The trap builtin.
11640 trapcmd(int argc, char **argv)
11647 for (signo = 0 ; signo < NSIG ; signo++) {
11648 if (trap[signo] != NULL) {
11652 p = single_quote(trap[signo]);
11653 sn = sys_siglist[signo];
11655 sn = u_signal_names(0, &signo, 0);
11658 printf("trap -- %s %s\n", p, sn);
11670 if ((signo = decode_signal(*ap, 0)) < 0)
11671 error("%s: bad trap", *ap);
11674 if (action[0] == '-' && action[1] == '\0')
11677 action = xstrdup(action);
11680 ckfree(trap[signo]);
11681 trap[signo] = action;
11696 * Set the signal handler for the specified signal. The routine figures
11697 * out what it should be set to.
11701 setsignal(int signo)
11705 struct sigaction act;
11707 if ((t = trap[signo]) == NULL)
11709 else if (*t != '\0')
11713 if (rootshell && action == S_DFL) {
11716 if (iflag || minusc || sflag == 0)
11732 #ifdef CONFIG_ASH_JOB_CONTROL
11742 t = &sigmode[signo - 1];
11745 * current setting unknown
11747 if (sigaction(signo, 0, &act) == -1) {
11749 * Pretend it worked; maybe we should give a warning
11750 * here, but other shells don't. We don't alter
11751 * sigmode, so that we retry every time.
11755 if (act.sa_handler == SIG_IGN) {
11756 if (mflag && (signo == SIGTSTP ||
11757 signo == SIGTTIN || signo == SIGTTOU)) {
11758 *t = S_IGN; /* don't hard ignore these */
11762 *t = S_RESET; /* force to be set */
11765 if (*t == S_HARD_IGN || *t == action)
11767 act.sa_handler = ((action == S_CATCH) ? onsig
11768 : ((action == S_IGN) ? SIG_IGN : SIG_DFL));
11771 sigemptyset(&act.sa_mask);
11772 sigaction(signo, &act, 0);
11780 ignoresig(int signo)
11782 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
11783 signal(signo, SIG_IGN);
11785 sigmode[signo - 1] = S_HARD_IGN;
11796 if (signo == SIGINT && trap[SIGINT] == NULL) {
11800 gotsig[signo - 1] = 1;
11806 * Called to execute a trap. Perhaps we should avoid entering new trap
11807 * handlers while we are executing a trap handler.
11817 for (i = 1 ; ; i++) {
11824 savestatus=exitstatus;
11825 evalstring(trap[i], 0);
11826 exitstatus=savestatus;
11833 * Called to exit the shell.
11837 exitshell(int status)
11839 struct jmploc loc1, loc2;
11842 TRACE(("exitshell(%d) pid=%d\n", status, getpid()));
11843 if (setjmp(loc1.loc)) {
11846 if (setjmp(loc2.loc)) {
11850 if ((p = trap[0]) != NULL && *p != '\0') {
11854 l1: handler = &loc2; /* probably unnecessary */
11856 #ifdef CONFIG_ASH_JOB_CONTROL
11863 static int decode_signal(const char *string, int minsig)
11866 const char *name = u_signal_names(string, &signo, minsig);
11868 return name ? signo : -1;
11871 static struct var **hashvar (const char *);
11872 static void showvars (const char *, int, int);
11873 static struct var **findvar (struct var **, const char *);
11876 * Initialize the varable symbol tables and import the environment
11880 * This routine initializes the builtin variables. It is called when the
11881 * shell is initialized and again when a shell procedure is spawned.
11886 const struct varinit *ip;
11890 for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
11891 if ((vp->flags & VEXPORT) == 0) {
11892 vpp = hashvar(ip->text);
11895 vp->text = xstrdup(ip->text);
11896 vp->flags = ip->flags;
11897 vp->func = ip->func;
11900 #if !defined(CONFIG_FEATURE_COMMAND_EDITING) || !defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
11902 * PS1 depends on uid
11904 if ((vps1.flags & VEXPORT) == 0) {
11905 vpp = hashvar("PS1=$");
11908 vps1.text = xstrdup(geteuid() ? "PS1=$ " : "PS1=# ");
11909 vps1.flags = VSTRFIXED|VTEXTFIXED;
11915 * Set the value of a variable. The flags argument is ored with the
11916 * flags of the variable. If val is NULL, the variable is unset.
11920 setvar(const char *name, const char *val, int flags)
11935 if (! is_in_name(*p)) {
11936 if (*p == '\0' || *p == '=')
11942 namelen = p - name;
11944 error("%.*s: bad variable name", namelen, name);
11945 len = namelen + 2; /* 2 is space for '=' and '\0' */
11949 len += vallen = strlen(val);
11952 nameeq = xmalloc(len);
11953 memcpy(nameeq, name, namelen);
11954 nameeq[namelen] = '=';
11956 memcpy(nameeq + namelen + 1, val, vallen + 1);
11958 nameeq[namelen + 1] = '\0';
11960 setvareq(nameeq, flags);
11967 * Same as setvar except that the variable and value are passed in
11968 * the first argument as name=value. Since the first argument will
11969 * be actually stored in the table, it should not be a string that
11974 setvareq(char *s, int flags)
11976 struct var *vp, **vpp;
11979 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
11980 if ((vp = *findvar(vpp, s))) {
11981 if (vp->flags & VREADONLY) {
11982 size_t len = strchr(s, '=') - s;
11983 error("%.*s: is read only", len, s);
11987 if (vp->func && (flags & VNOFUNC) == 0)
11988 (*vp->func)(strchr(s, '=') + 1);
11990 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
11993 vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
11994 vp->flags |= flags;
11997 #ifdef CONFIG_ASH_MAIL
11999 * We could roll this to a function, to handle it as
12000 * a regular variable function callback, but why bother?
12002 if (iflag && (vp == &vmpath || (vp == &vmail && !mpathset())))
12009 vp = xmalloc(sizeof (*vp));
12020 * Process a linked list of variable assignments.
12024 listsetvar(struct strlist *mylist)
12026 struct strlist *lp;
12029 for (lp = mylist ; lp ; lp = lp->next) {
12030 setvareq(xstrdup(lp->text), 0);
12038 * Find the value of a variable. Returns NULL if not set.
12041 static const char *
12042 lookupvar(const char *name)
12046 if ((v = *findvar(hashvar(name), name)) && !(v->flags & VUNSET)) {
12047 return strchr(v->text, '=') + 1;
12055 * Search the environment of a builtin command.
12058 static const char *
12059 bltinlookup(const char *name)
12061 const struct strlist *sp;
12063 for (sp = cmdenviron ; sp ; sp = sp->next) {
12064 if (varequal(sp->text, name))
12065 return strchr(sp->text, '=') + 1;
12067 return lookupvar(name);
12073 * Generate a list of exported variables. This routine is used to construct
12074 * the third argument to execve when executing a program.
12086 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
12087 for (vp = *vpp ; vp ; vp = vp->next)
12088 if (vp->flags & VEXPORT)
12091 ep = env = stalloc((nenv + 1) * sizeof *env);
12092 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
12093 for (vp = *vpp ; vp ; vp = vp->next)
12094 if (vp->flags & VEXPORT)
12103 * Called when a shell procedure is invoked to clear out nonexported
12104 * variables. It is also necessary to reallocate variables of with
12105 * VSTACK set since these are currently allocated on the stack.
12111 struct var *vp, **prev;
12113 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
12114 for (prev = vpp ; (vp = *prev) != NULL ; ) {
12115 if ((vp->flags & VEXPORT) == 0) {
12117 if ((vp->flags & VTEXTFIXED) == 0)
12119 if ((vp->flags & VSTRFIXED) == 0)
12122 if (vp->flags & VSTACK) {
12123 vp->text = xstrdup(vp->text);
12124 vp->flags &=~ VSTACK;
12136 * Command to list all variables which are set. Currently this command
12137 * is invoked from the set command when the set command is called without
12142 showvarscmd(int argc, char **argv)
12144 showvars(nullstr, VUNSET, VUNSET);
12151 * The export and readonly commands.
12155 exportcmd(int argc, char **argv)
12160 int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
12163 listsetvar(cmdenviron);
12164 pflag = (nextopt("p") == 'p');
12165 if (argc > 1 && !pflag) {
12166 while ((name = *argptr++) != NULL) {
12167 if ((p = strchr(name, '=')) != NULL) {
12170 if ((vp = *findvar(hashvar(name), name))) {
12175 setvar(name, p, flag);
12179 showvars(argv[0], flag, 0);
12186 * The "local" command.
12189 /* funcnest nonzero if we are currently evaluating a function */
12192 localcmd(int argc, char **argv)
12197 error("Not in a function");
12198 while ((name = *argptr++) != NULL) {
12206 * Make a variable a local variable. When a variable is made local, it's
12207 * value and flags are saved in a localvar structure. The saved values
12208 * will be restored when the shell function returns. We handle the name
12209 * "-" as a special case.
12213 mklocal(char *name)
12215 struct localvar *lvp;
12220 lvp = xmalloc(sizeof (struct localvar));
12221 if (name[0] == '-' && name[1] == '\0') {
12223 p = xmalloc(sizeof optet_vals);
12224 lvp->text = memcpy(p, optet_vals, sizeof optet_vals);
12227 vpp = hashvar(name);
12228 vp = *findvar(vpp, name);
12230 if (strchr(name, '='))
12231 setvareq(xstrdup(name), VSTRFIXED);
12233 setvar(name, NULL, VSTRFIXED);
12234 vp = *vpp; /* the new variable */
12236 lvp->flags = VUNSET;
12238 lvp->text = vp->text;
12239 lvp->flags = vp->flags;
12240 vp->flags |= VSTRFIXED|VTEXTFIXED;
12241 if (strchr(name, '='))
12242 setvareq(xstrdup(name), 0);
12246 lvp->next = localvars;
12253 * Called after a function returns.
12258 struct localvar *lvp;
12261 while ((lvp = localvars) != NULL) {
12262 localvars = lvp->next;
12264 if (vp == NULL) { /* $- saved */
12265 memcpy(optet_vals, lvp->text, sizeof optet_vals);
12267 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
12268 (void)unsetvar(vp->text);
12270 if ((vp->flags & VTEXTFIXED) == 0)
12272 vp->flags = lvp->flags;
12273 vp->text = lvp->text;
12281 setvarcmd(int argc, char **argv)
12284 return unsetcmd(argc, argv);
12285 else if (argc == 3)
12286 setvar(argv[1], argv[2], 0);
12288 error("List assignment not implemented");
12294 * The unset builtin command. We unset the function before we unset the
12295 * variable to allow a function to be unset when there is a readonly variable
12296 * with the same name.
12300 unsetcmd(int argc, char **argv)
12308 while ((i = nextopt("vf")) != '\0') {
12314 if (flg_func == 0 && flg_var == 0)
12317 for (ap = argptr; *ap ; ap++) {
12321 ret |= unsetvar(*ap);
12328 * Unset the specified variable.
12332 unsetvar(const char *s)
12337 vpp = findvar(hashvar(s), s);
12340 if (vp->flags & VREADONLY)
12343 if (*(strchr(vp->text, '=') + 1) != '\0')
12344 setvar(s, nullstr, 0);
12345 vp->flags &= ~VEXPORT;
12346 vp->flags |= VUNSET;
12347 if ((vp->flags & VSTRFIXED) == 0) {
12348 if ((vp->flags & VTEXTFIXED) == 0)
12363 * Find the appropriate entry in the hash table from the name.
12366 static struct var **
12367 hashvar(const char *p)
12369 unsigned int hashval;
12371 hashval = ((unsigned char) *p) << 4;
12372 while (*p && *p != '=')
12373 hashval += (unsigned char) *p++;
12374 return &vartab[hashval % VTABSIZE];
12380 * Returns true if the two strings specify the same varable. The first
12381 * variable name is terminated by '='; the second may be terminated by
12382 * either '=' or '\0'.
12386 varequal(const char *p, const char *q)
12388 while (*p == *q++) {
12392 if (*p == '=' && *(q - 1) == '\0')
12398 showvars(const char *myprefix, int mask, int xor)
12402 const char *sep = myprefix == nullstr ? myprefix : spcstr;
12404 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
12405 for (vp = *vpp ; vp ; vp = vp->next) {
12406 if ((vp->flags & mask) ^ xor) {
12410 p = strchr(vp->text, '=') + 1;
12411 len = p - vp->text;
12412 p = single_quote(p);
12414 printf("%s%s%.*s%s\n", myprefix, sep, len,
12422 static struct var **
12423 findvar(struct var **vpp, const char *name)
12425 for (; *vpp; vpp = &(*vpp)->next) {
12426 if (varequal((*vpp)->text, name)) {
12434 * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
12435 * This file contains code for the times builtin.
12436 * $Id: ash.c,v 1.47 2002/04/13 05:37:10 timr Exp $
12438 static int timescmd (int argc, char **argv)
12441 long int clk_tck = sysconf(_SC_CLK_TCK);
12444 printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
12445 (int) (buf.tms_utime / clk_tck / 60),
12446 ((double) buf.tms_utime) / clk_tck,
12447 (int) (buf.tms_stime / clk_tck / 60),
12448 ((double) buf.tms_stime) / clk_tck,
12449 (int) (buf.tms_cutime / clk_tck / 60),
12450 ((double) buf.tms_cutime) / clk_tck,
12451 (int) (buf.tms_cstime / clk_tck / 60),
12452 ((double) buf.tms_cstime) / clk_tck);
12456 #ifdef CONFIG_ASH_MATH_SUPPORT
12457 /* The let builtin. */
12458 int letcmd(int argc, char **argv)
12463 char *tmp, *expression, p[13];
12464 expression = strchr(argv[1], '=');
12466 /* Cannot use 'error()' here, or the return code
12467 * will be incorrect */
12468 out2fmt("sh: let: syntax error: \"%s\"\n", argv[1]);
12471 *expression = '\0';
12472 tmp = ++expression;
12473 result = arith(tmp, &errcode);
12475 /* Cannot use 'error()' here, or the return code
12476 * will be incorrect */
12477 out2fmt("sh: let: ");
12479 out2fmt("divide by zero");
12481 out2fmt("syntax error: \"%s=%s\"\n", argv[1], expression);
12484 snprintf(p, 12, "%ld", result);
12485 setvar(argv[1], xstrdup(p), 0);
12486 } else if (argc >= 3)
12487 synerror("invalid operand");
12495 * Copyright (c) 1989, 1991, 1993, 1994
12496 * The Regents of the University of California. All rights reserved.
12498 * This code is derived from software contributed to Berkeley by
12499 * Kenneth Almquist.
12501 * Redistribution and use in source and binary forms, with or without
12502 * modification, are permitted provided that the following conditions
12504 * 1. Redistributions of source code must retain the above copyright
12505 * notice, this list of conditions and the following disclaimer.
12506 * 2. Redistributions in binary form must reproduce the above copyright
12507 * notice, this list of conditions and the following disclaimer in the
12508 * documentation and/or other materials provided with the distribution.
12510 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
12511 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
12513 * 4. Neither the name of the University nor the names of its contributors
12514 * may be used to endorse or promote products derived from this software
12515 * without specific prior written permission.
12517 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
12518 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
12519 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
12520 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
12521 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
12522 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
12523 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
12524 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
12525 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
12526 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF