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 $HOME/trace and a quit signal
38 * will generate a core dump. */
41 /* These are here to work with glibc -- Don't change these... */
63 #include <sys/cdefs.h>
64 #include <sys/ioctl.h>
65 #include <sys/param.h>
66 #include <sys/resource.h>
68 #include <sys/times.h>
69 #include <sys/types.h>
75 #if !defined(FNMATCH_BROKEN)
78 #if !defined(GLOB_BROKEN)
82 #ifdef CONFIG_ASH_JOB_CONTROL
89 * This file was generated by the mksyntax program.
93 #define CWORD 0 /* character is nothing special */
94 #define CNL 1 /* newline character */
95 #define CBACK 2 /* a backslash character */
96 #define CSQUOTE 3 /* single quote */
97 #define CDQUOTE 4 /* double quote */
98 #define CENDQUOTE 5 /* a terminating quote */
99 #define CBQUOTE 6 /* backwards single quote */
100 #define CVAR 7 /* a dollar sign */
101 #define CENDVAR 8 /* a '}' character */
102 #define CLP 9 /* a left paren in arithmetic */
103 #define CRP 10 /* a right paren in arithmetic */
104 #define CENDFILE 11 /* end of file */
105 #define CCTL 12 /* like CWORD, except it must be escaped */
106 #define CSPCL 13 /* these terminate a word */
107 #define CIGN 14 /* character should be ignored */
127 #define TENDBQUOTE 13
147 /* control characters in argument strings */
148 #define CTLESC '\201'
149 #define CTLVAR '\202'
150 #define CTLENDVAR '\203'
151 #define CTLBACKQ '\204'
152 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
153 /* CTLBACKQ | CTLQUOTE == '\205' */
154 #define CTLARI '\206'
155 #define CTLENDARI '\207'
156 #define CTLQUOTEMARK '\210'
159 #define is_digit(c) ((c)>='0' && (c)<='9')
160 #define is_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalpha((unsigned char) (c))))
161 #define is_in_name(c) (((c) < CTLESC || (c) > CTLENDARI) && ((c) == '_' || isalnum((unsigned char) (c))))
164 * is_special(c) evaluates to 1 for c in "!#$*-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);
251 #define INTON __inton()
252 #define FORCEINTON forceinton()
255 #define CLEAR_PENDING_INT intpending = 0
256 #define int_pending() intpending
259 typedef void *pointer;
262 #define NULL (void *)0
265 static pointer stalloc(int);
266 static void stunalloc(pointer);
267 static void ungrabstackstr(char *, char *);
268 static char *growstackstr(void);
269 static char *makestrspace(size_t newlen);
272 * Parse trees for commands are allocated in lifo order, so we use a stack
273 * to make this more efficient, and also to avoid all sorts of exception
274 * handling code to handle interrupts in the middle of a parse.
276 * The size 504 was chosen because the Ultrix malloc handles that size
280 #define MINSIZE 504 /* minimum size of a block */
284 struct stack_block *prev;
288 static struct stack_block stackbase;
289 static struct stack_block *stackp = &stackbase;
290 static struct stackmark *markp;
291 static char *stacknxt = stackbase.space;
292 static int stacknleft = MINSIZE;
295 #define equal(s1, s2) (strcmp(s1, s2) == 0)
297 #define stackblock() stacknxt
298 #define stackblocksize() stacknleft
299 #define STARTSTACKSTR(p) p = stackblock(), sstrnleft = stackblocksize()
301 #define STPUTC(c, p) (--sstrnleft >= 0? (*p++ = (c)) : (p = growstackstr(), *p++ = (c)))
302 #define CHECKSTRSPACE(n, p) { if (sstrnleft < n) p = makestrspace(n); }
303 #define STACKSTRNUL(p) (sstrnleft == 0? (p = growstackstr(), *p = '\0') : (*p = '\0'))
306 #define USTPUTC(c, p) (--sstrnleft, *p++ = (c))
307 #define STUNPUTC(p) (++sstrnleft, --p)
308 #define STTOPC(p) p[-1]
309 #define STADJUST(amount, p) (p += (amount), sstrnleft -= (amount))
310 #define grabstackstr(p) stalloc(stackblocksize() - sstrnleft)
314 #define TRACE(param) trace param
315 typedef union node unode;
316 static void trace(const char *, ...);
317 static void trargs(char **);
318 static void showtree(unode *);
319 static void trputc(int);
320 static void trputs(const char *);
321 static void opentrace(void);
356 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
357 #define EXP_TILDE 0x2 /* do normal tilde expansion */
358 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
359 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
360 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
361 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
366 static char optet_vals[NOPTS];
368 static const char *const optlist[NOPTS] = {
387 #define optent_name(optent) (optent+1)
388 #define optent_letter(optent) optent[0]
389 #define optent_val(optent) optet_vals[optent]
391 #define eflag optent_val(0)
392 #define fflag optent_val(1)
393 #define Iflag optent_val(2)
394 #define iflag optent_val(3)
395 #define mflag optent_val(4)
396 #define nflag optent_val(5)
397 #define sflag optent_val(6)
398 #define xflag optent_val(7)
399 #define vflag optent_val(8)
400 #define Vflag optent_val(9)
401 #define Eflag optent_val(10)
402 #define Cflag optent_val(11)
403 #define aflag optent_val(12)
404 #define bflag optent_val(13)
405 #define uflag optent_val(14)
406 #define qflag optent_val(15)
409 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
427 union node *redirect;
434 struct nodelist *cmdlist;
441 union node *redirect;
449 union node *elsepart;
480 struct nodelist *backquote;
518 struct nbinary nbinary;
521 struct nredir nredir;
525 struct nclist nclist;
535 struct nodelist *next;
539 struct backcmd { /* result of evalbackcmd */
540 int fd; /* file descriptor to read from */
541 char *buf; /* buffer */
542 int nleft; /* number of chars in buffer */
543 struct job *jp; /* job structure for command */
551 const struct builtincmd *cmd;
556 struct strlist *next;
562 struct strlist *list;
563 struct strlist **lastp;
567 struct strpush *prev; /* preceding string on stack */
570 #ifdef CONFIG_ASH_ALIAS
571 struct alias *ap; /* if push was associated with an alias */
573 char *string; /* remember the string since it may change */
577 struct parsefile *prev; /* preceding file on stack */
578 int linno; /* current line */
579 int fd; /* file descriptor (or -1 if string) */
580 int nleft; /* number of chars left in this line */
581 int lleft; /* number of chars left in this buffer */
582 char *nextc; /* next char in buffer */
583 char *buf; /* input buffer */
584 struct strpush *strpush; /* for pushing strings at this level */
585 struct strpush basestrpush; /* so pushing one is fast */
589 struct stack_block *stackp;
592 struct stackmark *marknext;
596 int nparam; /* # of positional parameters (without $0) */
597 unsigned char malloc; /* if parameter list dynamically allocated */
598 char **p; /* parameter list */
599 int optind; /* next parameter to be processed by getopts */
600 int optoff; /* used by getopts */
604 * When commands are first encountered, they are entered in a hash table.
605 * This ensures that a full path search will not have to be done for them
606 * on each invocation.
608 * We should investigate converting to a linear search, even though that
609 * would make the command name "hash" a misnomer.
611 #define CMDTABLESIZE 31 /* should be prime */
612 #define ARB 1 /* actual size determined at run time */
617 struct tblentry *next; /* next entry in hash chain */
618 union param param; /* definition of builtin function */
619 short cmdtype; /* index identifying command */
620 char rehash; /* if set, cd done since entry created */
621 char cmdname[ARB]; /* name of command */
625 static struct tblentry *cmdtable[CMDTABLESIZE];
626 static int builtinloc = -1; /* index in path of %builtin, or -1 */
627 static int exerrno = 0; /* Last exec error */
630 static void tryexec(char *, char **, char **);
631 static void printentry(struct tblentry *, int);
632 static void clearcmdentry(int);
633 static struct tblentry *cmdlookup(const char *, int);
634 static void delete_cmd_entry(void);
635 static int path_change(const char *, int *);
638 static void flushall(void);
639 static void out2fmt(const char *, ...)
640 __attribute__ ((__format__(__printf__, 1, 2)));
641 static int xwrite(int, const char *, int);
643 static inline void outstr(const char *p, FILE * file)
647 static void out1str(const char *p)
651 static void out2str(const char *p)
656 #ifndef CONFIG_ASH_OPTIMIZE_FOR_SIZE
657 #define out2c(c) putc((c), stderr)
659 static void out2c(int c)
666 #ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
667 #define USE_SIT_FUNCTION
670 /* number syntax index */
671 #define BASESYNTAX 0 /* not in quotes */
672 #define DQSYNTAX 1 /* in double quotes */
673 #define SQSYNTAX 2 /* in single quotes */
674 #define ARISYNTAX 3 /* in arithmetic */
676 static const char S_I_T[][4] = {
677 {CSPCL, CIGN, CIGN, CIGN}, /* 0, PEOA */
678 {CSPCL, CWORD, CWORD, CWORD}, /* 1, ' ' */
679 {CNL, CNL, CNL, CNL}, /* 2, \n */
680 {CWORD, CCTL, CCTL, CWORD}, /* 3, !*-/:=?[]~ */
681 {CDQUOTE, CENDQUOTE, CWORD, CDQUOTE}, /* 4, '"' */
682 {CVAR, CVAR, CWORD, CVAR}, /* 5, $ */
683 {CSQUOTE, CWORD, CENDQUOTE, CSQUOTE}, /* 6, "'" */
684 {CSPCL, CWORD, CWORD, CLP}, /* 7, ( */
685 {CSPCL, CWORD, CWORD, CRP}, /* 8, ) */
686 {CBACK, CBACK, CCTL, CBACK}, /* 9, \ */
687 {CBQUOTE, CBQUOTE, CWORD, CBQUOTE}, /* 10, ` */
688 {CENDVAR, CENDVAR, CWORD, CENDVAR}, /* 11, } */
689 #ifndef USE_SIT_FUNCTION
690 {CENDFILE, CENDFILE, CENDFILE, CENDFILE}, /* 12, PEOF */
691 {CWORD, CWORD, CWORD, CWORD}, /* 13, 0-9A-Za-z */
692 {CCTL, CCTL, CCTL, CCTL} /* 14, CTLESC ... */
696 #ifdef USE_SIT_FUNCTION
698 #define U_C(c) ((unsigned char)(c))
700 static int SIT(int c, int syntax)
702 static const char spec_symbls[] = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
703 static const char syntax_index_table[] = {
704 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
705 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
706 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
712 if (c == PEOF) /* 2^8+2 */
714 if (c == PEOA) /* 2^8+1 */
716 else if (U_C(c) >= U_C(CTLESC) && U_C(c) <= U_C(CTLQUOTEMARK))
719 s = strchr(spec_symbls, c);
722 indx = syntax_index_table[(s - spec_symbls)];
724 return S_I_T[indx][syntax];
727 #else /* USE_SIT_FUNCTION */
729 #define SIT(c, syntax) S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax]
731 #define CSPCL_CIGN_CIGN_CIGN 0
732 #define CSPCL_CWORD_CWORD_CWORD 1
733 #define CNL_CNL_CNL_CNL 2
734 #define CWORD_CCTL_CCTL_CWORD 3
735 #define CDQUOTE_CENDQUOTE_CWORD_CDQUOTE 4
736 #define CVAR_CVAR_CWORD_CVAR 5
737 #define CSQUOTE_CWORD_CENDQUOTE_CSQUOTE 6
738 #define CSPCL_CWORD_CWORD_CLP 7
739 #define CSPCL_CWORD_CWORD_CRP 8
740 #define CBACK_CBACK_CCTL_CBACK 9
741 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
742 #define CENDVAR_CENDVAR_CWORD_CENDVAR 11
743 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
744 #define CWORD_CWORD_CWORD_CWORD 13
745 #define CCTL_CCTL_CCTL_CCTL 14
747 static const char syntax_index_table[258] = {
748 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
749 /* 0 -130 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
750 /* 1 -129 PEOA */ CSPCL_CIGN_CIGN_CIGN,
751 /* 2 -128 0xff */ CWORD_CWORD_CWORD_CWORD,
752 /* 3 -127 */ CCTL_CCTL_CCTL_CCTL,
754 /* 4 -126 */ CCTL_CCTL_CCTL_CCTL,
755 /* 5 -125 */ CCTL_CCTL_CCTL_CCTL,
756 /* 6 -124 */ CCTL_CCTL_CCTL_CCTL,
757 /* 7 -123 */ CCTL_CCTL_CCTL_CCTL,
758 /* 8 -122 */ CCTL_CCTL_CCTL_CCTL,
759 /* 9 -121 */ CCTL_CCTL_CCTL_CCTL,
760 /* 10 -120 */ CCTL_CCTL_CCTL_CCTL,
762 /* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
763 /* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
764 /* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
765 /* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
766 /* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
767 /* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
768 /* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
769 /* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
770 /* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
771 /* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
772 /* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
773 /* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
774 /* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
775 /* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
776 /* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
777 /* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
778 /* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
779 /* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
780 /* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
781 /* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
782 /* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
783 /* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
784 /* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
785 /* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
786 /* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
787 /* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
788 /* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
789 /* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
790 /* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
791 /* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
792 /* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
793 /* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
794 /* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
795 /* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
796 /* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
797 /* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
798 /* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
799 /* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
800 /* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
801 /* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
802 /* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
803 /* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
804 /* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
805 /* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
806 /* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
807 /* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
808 /* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
809 /* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
810 /* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
811 /* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
812 /* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
813 /* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
814 /* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
815 /* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
816 /* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
817 /* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
818 /* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
819 /* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
820 /* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
821 /* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
822 /* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
823 /* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
824 /* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
825 /* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
826 /* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
827 /* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
828 /* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
829 /* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
830 /* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
831 /* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
832 /* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
833 /* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
834 /* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
835 /* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
836 /* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
837 /* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
838 /* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
839 /* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
840 /* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
841 /* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
842 /* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
843 /* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
844 /* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
845 /* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
846 /* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
847 /* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
848 /* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
849 /* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
850 /* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
851 /* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
852 /* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
853 /* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
854 /* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
855 /* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
856 /* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
857 /* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
858 /* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
859 /* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
860 /* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
861 /* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
862 /* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
863 /* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
864 /* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
865 /* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
866 /* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
867 /* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
868 /* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
869 /* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
870 /* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
871 /* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
872 /* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
873 /* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
874 /* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
875 /* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
876 /* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
877 /* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
878 /* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
879 /* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
880 /* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
881 /* 130 0 */ CWORD_CWORD_CWORD_CWORD,
882 /* 131 1 */ CWORD_CWORD_CWORD_CWORD,
883 /* 132 2 */ CWORD_CWORD_CWORD_CWORD,
884 /* 133 3 */ CWORD_CWORD_CWORD_CWORD,
885 /* 134 4 */ CWORD_CWORD_CWORD_CWORD,
886 /* 135 5 */ CWORD_CWORD_CWORD_CWORD,
887 /* 136 6 */ CWORD_CWORD_CWORD_CWORD,
888 /* 137 7 */ CWORD_CWORD_CWORD_CWORD,
889 /* 138 8 */ CWORD_CWORD_CWORD_CWORD,
890 /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
891 /* 140 10 "\n" */ CNL_CNL_CNL_CNL,
892 /* 141 11 */ CWORD_CWORD_CWORD_CWORD,
893 /* 142 12 */ CWORD_CWORD_CWORD_CWORD,
894 /* 143 13 */ CWORD_CWORD_CWORD_CWORD,
895 /* 144 14 */ CWORD_CWORD_CWORD_CWORD,
896 /* 145 15 */ CWORD_CWORD_CWORD_CWORD,
897 /* 146 16 */ CWORD_CWORD_CWORD_CWORD,
898 /* 147 17 */ CWORD_CWORD_CWORD_CWORD,
899 /* 148 18 */ CWORD_CWORD_CWORD_CWORD,
900 /* 149 19 */ CWORD_CWORD_CWORD_CWORD,
901 /* 150 20 */ CWORD_CWORD_CWORD_CWORD,
902 /* 151 21 */ CWORD_CWORD_CWORD_CWORD,
903 /* 152 22 */ CWORD_CWORD_CWORD_CWORD,
904 /* 153 23 */ CWORD_CWORD_CWORD_CWORD,
905 /* 154 24 */ CWORD_CWORD_CWORD_CWORD,
906 /* 155 25 */ CWORD_CWORD_CWORD_CWORD,
907 /* 156 26 */ CWORD_CWORD_CWORD_CWORD,
908 /* 157 27 */ CWORD_CWORD_CWORD_CWORD,
909 /* 158 28 */ CWORD_CWORD_CWORD_CWORD,
910 /* 159 29 */ CWORD_CWORD_CWORD_CWORD,
911 /* 160 30 */ CWORD_CWORD_CWORD_CWORD,
912 /* 161 31 */ CWORD_CWORD_CWORD_CWORD,
913 /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
914 /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
915 /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CDQUOTE,
916 /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
917 /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
918 /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
919 /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
920 /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CSQUOTE,
921 /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
922 /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
923 /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
924 /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
925 /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
926 /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
927 /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
928 /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
929 /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
930 /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
931 /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
932 /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
933 /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
934 /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
935 /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
936 /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
937 /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
938 /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
939 /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
940 /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
941 /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
942 /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
943 /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
944 /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
945 /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
946 /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
947 /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
948 /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
949 /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
950 /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
951 /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
952 /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
953 /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
954 /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
955 /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
956 /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
957 /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
958 /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
959 /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
960 /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
961 /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
962 /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
963 /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
964 /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
965 /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
966 /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
967 /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
968 /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
969 /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
970 /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
971 /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
972 /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
973 /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
974 /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
975 /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
976 /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
977 /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
978 /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
979 /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
980 /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
981 /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
982 /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
983 /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
984 /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
985 /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
986 /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
987 /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
988 /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
989 /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
990 /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
991 /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
992 /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
993 /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
994 /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
995 /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
996 /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
997 /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
998 /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
999 /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
1000 /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
1001 /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
1002 /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
1003 /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
1004 /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
1005 /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
1006 /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
1007 /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
1008 /* 257 127 */ CWORD_CWORD_CWORD_CWORD,
1011 #endif /* USE_SIT_FUNCTION */
1014 /* first char is indicating which tokens mark the end of a list */
1015 static const char *const tokname_array[] = {
1030 #define KWDOFFSET 14
1031 /* the following are keywords */
1050 static const char *tokname(int tok)
1052 static char buf[16];
1056 sprintf(buf + (tok >= TSEMI), "%s%c",
1057 tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0));
1061 static int plinno = 1; /* input line number */
1063 static int parselleft; /* copy of parsefile->lleft */
1065 static struct parsefile basepf; /* top level input file */
1066 static char basebuf[BUFSIZ]; /* buffer for top level input file */
1067 static struct parsefile *parsefile = &basepf; /* current input file */
1070 * NEOF is returned by parsecmd when it encounters an end of file. It
1071 * must be distinct from NULL, so we use the address of a variable that
1072 * happens to be handy.
1075 static int tokpushback; /* last token pushed back */
1077 #define NEOF ((union node *)&tokpushback)
1078 static int checkkwd; /* 1 == check for kwds, 2 == also eat newlines */
1081 static void error(const char *, ...) __attribute__ ((__noreturn__));
1082 static void exerror(int, const char *, ...) __attribute__ ((__noreturn__));
1083 static void shellexec(char **, char **, const char *, int)
1084 __attribute__ ((noreturn));
1085 static void exitshell(int) __attribute__ ((noreturn));
1087 static int goodname(const char *);
1088 static void ignoresig(int);
1089 static void onsig(int);
1090 static void dotrap(void);
1091 static int decode_signal(const char *, int);
1093 static void setparam(char **);
1094 static void freeparam(volatile struct shparam *);
1096 /* reasons for skipping commands (see comment on breakcmd routine) */
1102 /* values of cmdtype */
1103 #define CMDUNKNOWN -1 /* no entry in table for command */
1104 #define CMDNORMAL 0 /* command is an executable program */
1105 #define CMDBUILTIN 1 /* command is a shell builtin */
1106 #define CMDFUNCTION 2 /* command is a shell function */
1108 #define DO_ERR 1 /* find_command prints errors */
1109 #define DO_ABS 2 /* find_command checks absolute paths */
1110 #define DO_NOFUN 4 /* find_command ignores functions */
1111 #define DO_BRUTE 8 /* find_command ignores hash table */
1118 #define VEXPORT 0x01 /* variable is exported */
1119 #define VREADONLY 0x02 /* variable cannot be modified */
1120 #define VSTRFIXED 0x04 /* variable struct is staticly allocated */
1121 #define VTEXTFIXED 0x08 /* text is staticly allocated */
1122 #define VSTACK 0x10 /* text is allocated on the stack */
1123 #define VUNSET 0x20 /* the variable is not set */
1124 #define VNOFUNC 0x40 /* don't call the callback function */
1128 struct var *next; /* next entry in hash list */
1129 int flags; /* flags are defined above */
1130 char *text; /* name=value */
1131 void (*func) (const char *);
1132 /* function to be called when */
1133 /* the variable gets set/unset */
1137 struct localvar *next; /* next local variable in list */
1138 struct var *vp; /* the variable that was made local */
1139 int flags; /* saved flags */
1140 char *text; /* saved text */
1144 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
1145 #define rmescapes(p) _rmescapes((p), 0)
1146 static char *_rmescapes(char *, int);
1148 static void rmescapes(char *);
1151 static int casematch(union node *, const char *);
1152 static void clearredir(void);
1153 static void popstring(void);
1154 static void readcmdfile(const char *);
1156 static int number(const char *);
1157 static int is_number(const char *, int *num);
1158 static char *single_quote(const char *);
1159 static int nextopt(const char *);
1161 static void redirect(union node *, int);
1162 static void popredir(void);
1163 static int dup_as_newfd(int, int);
1165 static void changepath(const char *newval);
1166 static void getoptsreset(const char *value);
1169 static int parsenleft; /* copy of parsefile->nleft */
1170 static char *parsenextc; /* copy of parsefile->nextc */
1171 static int rootpid; /* pid of main shell */
1172 static int rootshell; /* true if we aren't a child of the main shell */
1174 static const char spcstr[] = " ";
1175 static const char snlfmt[] = "%s\n";
1177 static int sstrnleft;
1178 static int herefd = -1;
1180 static struct localvar *localvars;
1182 static struct var vifs;
1183 static struct var vmail;
1184 static struct var vmpath;
1185 static struct var vpath;
1186 static struct var vps1;
1187 static struct var vps2;
1188 static struct var voptind;
1190 #ifdef CONFIG_LOCALE_SUPPORT
1191 static struct var vlc_all;
1192 static struct var vlc_ctype;
1199 void (*func) (const char *);
1202 static const char defpathvar[] =
1203 "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
1204 #define defpath (defpathvar + 5)
1207 static const char defifsvar[] = "IFS= \t\n";
1209 #define defifs (defifsvar + 4)
1211 static const char defifs[] = " \t\n";
1214 static const struct varinit varinit[] = {
1216 {&vifs, VSTRFIXED | VTEXTFIXED, defifsvar,
1218 {&vifs, VSTRFIXED | VTEXTFIXED | VUNSET, "IFS=",
1221 {&vmail, VSTRFIXED | VTEXTFIXED | VUNSET, "MAIL=",
1223 {&vmpath, VSTRFIXED | VTEXTFIXED | VUNSET, "MAILPATH=",
1225 {&vpath, VSTRFIXED | VTEXTFIXED, defpathvar,
1227 #if defined(CONFIG_FEATURE_COMMAND_EDITING) && defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
1228 {&vps1, VSTRFIXED | VTEXTFIXED, "PS1=\\w \\$ ",
1230 #endif /* else vps1 depends on uid */
1231 {&vps2, VSTRFIXED | VTEXTFIXED, "PS2=> ",
1233 {&voptind, VSTRFIXED | VTEXTFIXED, "OPTIND=1",
1235 #ifdef CONFIG_LOCALE_SUPPORT
1236 {&vlc_all, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_ALL=",
1238 {&vlc_ctype, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_CTYPE=",
1247 static struct var *vartab[VTABSIZE];
1250 * The following macros access the values of the above variables.
1251 * They have to skip over the name. They return the null string
1252 * for unset variables.
1255 #define ifsval() (vifs.text + 4)
1256 #define ifsset() ((vifs.flags & VUNSET) == 0)
1257 #define mailval() (vmail.text + 5)
1258 #define mpathval() (vmpath.text + 9)
1259 #define pathval() (vpath.text + 5)
1260 #define ps1val() (vps1.text + 4)
1261 #define ps2val() (vps2.text + 4)
1262 #define optindval() (voptind.text + 7)
1264 #define mpathset() ((vmpath.flags & VUNSET) == 0)
1266 static void initvar(void);
1267 static void setvar(const char *, const char *, int);
1268 static void setvareq(char *, int);
1269 static void listsetvar(struct strlist *);
1270 static const char *lookupvar(const char *);
1271 static const char *bltinlookup(const char *);
1272 static char **environment(void);
1273 static int showvarscmd(int, char **);
1274 static void mklocal(char *);
1275 static void poplocalvars(void);
1276 static int unsetvar(const char *);
1277 static int varequal(const char *, const char *);
1280 static char *arg0; /* value of $0 */
1281 static struct shparam shellparam; /* current positional parameters */
1282 static char **argptr; /* argument list for builtin commands */
1283 static char *optionarg; /* set by nextopt (like getopt) */
1284 static char *optptr; /* used by nextopt */
1285 static char *minusc; /* argument to -c option */
1288 #ifdef CONFIG_ASH_ALIAS
1290 #define ALIASINUSE 1
1302 static struct alias *atab[ATABSIZE];
1304 static void setalias(char *, char *);
1305 static struct alias **hashalias(const char *);
1306 static struct alias *freealias(struct alias *);
1307 static struct alias **__lookupalias(const char *);
1309 static void setalias(char *name, char *val)
1311 struct alias *ap, **app;
1313 app = __lookupalias(name);
1317 if (!(ap->flag & ALIASINUSE)) {
1320 ap->val = xstrdup(val);
1321 ap->flag &= ~ALIASDEAD;
1324 ap = xmalloc(sizeof(struct alias));
1325 ap->name = xstrdup(name);
1326 ap->val = xstrdup(val);
1334 static int unalias(char *name)
1338 app = __lookupalias(name);
1342 *app = freealias(*app);
1350 static void rmaliases(void)
1352 struct alias *ap, **app;
1356 for (i = 0; i < ATABSIZE; i++) {
1358 for (ap = *app; ap; ap = *app) {
1359 *app = freealias(*app);
1368 static void printalias(const struct alias *ap)
1372 p = single_quote(ap->val);
1373 printf("alias %s=%s\n", ap->name, p);
1379 * TODO - sort output
1381 static int aliascmd(int argc, char **argv)
1390 for (i = 0; i < ATABSIZE; i++)
1391 for (ap = atab[i]; ap; ap = ap->next) {
1396 while ((n = *++argv) != NULL) {
1397 if ((v = strchr(n + 1, '=')) == NULL) { /* n+1: funny ksh stuff */
1398 if ((ap = *__lookupalias(n)) == NULL) {
1399 out2fmt("%s: %s not found\n", "alias", n);
1412 static int unaliascmd(int argc, char **argv)
1416 while ((i = nextopt("a")) != '\0') {
1422 for (i = 0; *argptr; argptr++) {
1423 if (unalias(*argptr)) {
1424 out2fmt("%s: %s not found\n", "unalias", *argptr);
1432 static struct alias **hashalias(const char *p)
1434 unsigned int hashval;
1439 return &atab[hashval % ATABSIZE];
1442 static struct alias *freealias(struct alias *ap)
1446 if (ap->flag & ALIASINUSE) {
1447 ap->flag |= ALIASDEAD;
1459 static struct alias **__lookupalias(const char *name)
1461 struct alias **app = hashalias(name);
1463 for (; *app; app = &(*app)->next) {
1464 if (equal(name, (*app)->name)) {
1473 #ifdef CONFIG_ASH_MATH_SUPPORT
1474 /* The generated file arith.c has been replaced with a custom hand
1475 * written implementation written by Aaron Lehmann <aaronl@vitelus.com>.
1476 * This is now part of libbb, so that it can be used by all the shells
1478 static void expari(int);
1481 static char *trap[NSIG]; /* trap handler commands */
1482 static char sigmode[NSIG - 1]; /* current value of signal */
1483 static char gotsig[NSIG - 1]; /* indicates specified signal received */
1484 static int pendingsigs; /* indicates some signal received */
1487 * This file was generated by the mkbuiltins program.
1490 #ifdef CONFIG_ASH_JOB_CONTROL
1491 static int bgcmd(int, char **);
1492 static int fgcmd(int, char **);
1493 static int killcmd(int, char **);
1495 static int bltincmd(int, char **);
1496 static int cdcmd(int, char **);
1497 static int breakcmd(int, char **);
1499 #ifdef CONFIG_ASH_CMDCMD
1500 static int commandcmd(int, char **);
1502 static int dotcmd(int, char **);
1503 static int evalcmd(int, char **);
1504 static int execcmd(int, char **);
1505 static int exitcmd(int, char **);
1506 static int exportcmd(int, char **);
1507 static int histcmd(int, char **);
1508 static int hashcmd(int, char **);
1509 static int helpcmd(int, char **);
1510 static int jobscmd(int, char **);
1511 static int localcmd(int, char **);
1512 static int pwdcmd(int, char **);
1513 static int readcmd(int, char **);
1514 static int returncmd(int, char **);
1515 static int setcmd(int, char **);
1516 static int setvarcmd(int, char **);
1517 static int shiftcmd(int, char **);
1518 static int trapcmd(int, char **);
1519 static int umaskcmd(int, char **);
1521 #ifdef CONFIG_ASH_ALIAS
1522 static int aliascmd(int, char **);
1523 static int unaliascmd(int, char **);
1525 static int unsetcmd(int, char **);
1526 static int waitcmd(int, char **);
1527 static int ulimitcmd(int, char **);
1528 static int timescmd(int, char **);
1530 #ifdef CONFIG_ASH_MATH_SUPPORT
1531 static int letcmd(int, char **);
1533 static int typecmd(int, char **);
1535 #ifdef CONFIG_ASH_GETOPTS
1536 static int getoptscmd(int, char **);
1540 static int true_main(int, char **);
1542 #ifndef CONFIG_FALSE
1543 static int false_main(int, char **);
1546 static void setpwd(const char *, int);
1549 #define BUILTIN_NOSPEC "0"
1550 #define BUILTIN_SPECIAL "1"
1551 #define BUILTIN_REGULAR "2"
1552 #define BUILTIN_ASSIGN "4"
1553 #define BUILTIN_SPEC_ASSG "5"
1554 #define BUILTIN_REG_ASSG "6"
1556 #define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1)
1557 #define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2)
1558 #define IS_BUILTIN_ASSIGN(builtincmd) ((builtincmd)->name[0] & 4)
1562 int (*const builtinfunc) (int, char **);
1567 /* It is CRUCIAL that this listing be kept in ascii order, otherwise
1568 * the binary search in find_builtin() will stop working. If you value
1569 * your kneecaps, you'll be sure to *make sure* that any changes made
1570 * to this array result in the listing remaining in ascii order. You
1573 static const struct builtincmd builtincmds[] = {
1574 {BUILTIN_SPECIAL ".", dotcmd}, /* first, see declare DOTCMD */
1575 {BUILTIN_SPECIAL ":", true_main},
1576 #ifdef CONFIG_ASH_ALIAS
1577 {BUILTIN_REG_ASSG "alias", aliascmd},
1579 #ifdef CONFIG_ASH_JOB_CONTROL
1580 {BUILTIN_REGULAR "bg", bgcmd},
1582 {BUILTIN_SPECIAL "break", breakcmd},
1583 {BUILTIN_SPECIAL "builtin", bltincmd},
1584 {BUILTIN_REGULAR "cd", cdcmd},
1585 {BUILTIN_NOSPEC "chdir", cdcmd},
1586 #ifdef CONFIG_ASH_CMDCMD
1587 {BUILTIN_REGULAR "command", commandcmd},
1589 {BUILTIN_SPECIAL "continue", breakcmd},
1590 {BUILTIN_SPECIAL "eval", evalcmd},
1591 {BUILTIN_SPECIAL "exec", execcmd},
1592 {BUILTIN_SPECIAL "exit", exitcmd},
1593 {BUILTIN_SPEC_ASSG "export", exportcmd},
1594 {BUILTIN_REGULAR "false", false_main},
1595 {BUILTIN_REGULAR "fc", histcmd},
1596 #ifdef CONFIG_ASH_JOB_CONTROL
1597 {BUILTIN_REGULAR "fg", fgcmd},
1599 #ifdef CONFIG_ASH_GETOPTS
1600 {BUILTIN_REGULAR "getopts", getoptscmd},
1602 {BUILTIN_NOSPEC "hash", hashcmd},
1603 {BUILTIN_NOSPEC "help", helpcmd},
1604 {BUILTIN_REGULAR "jobs", jobscmd},
1605 #ifdef CONFIG_ASH_JOB_CONTROL
1606 {BUILTIN_REGULAR "kill", killcmd},
1608 #ifdef CONFIG_ASH_MATH_SUPPORT
1609 {BUILTIN_REGULAR "let", letcmd},
1611 {BUILTIN_ASSIGN "local", localcmd},
1612 {BUILTIN_NOSPEC "pwd", pwdcmd},
1613 {BUILTIN_REGULAR "read", readcmd},
1614 {BUILTIN_SPEC_ASSG "readonly", exportcmd},
1615 {BUILTIN_SPECIAL "return", returncmd},
1616 {BUILTIN_SPECIAL "set", setcmd},
1617 {BUILTIN_NOSPEC "setvar", setvarcmd},
1618 {BUILTIN_SPECIAL "shift", shiftcmd},
1619 {BUILTIN_SPECIAL "times", timescmd},
1620 {BUILTIN_SPECIAL "trap", trapcmd},
1621 {BUILTIN_REGULAR "true", true_main},
1622 {BUILTIN_NOSPEC "type", typecmd},
1623 {BUILTIN_NOSPEC "ulimit", ulimitcmd},
1624 {BUILTIN_REGULAR "umask", umaskcmd},
1625 #ifdef CONFIG_ASH_ALIAS
1626 {BUILTIN_REGULAR "unalias", unaliascmd},
1628 {BUILTIN_SPECIAL "unset", unsetcmd},
1629 {BUILTIN_REGULAR "wait", waitcmd},
1632 #define NUMBUILTINS (sizeof (builtincmds) / sizeof (struct builtincmd) )
1634 #define DOTCMD &builtincmds[0]
1635 static struct builtincmd *BLTINCMD;
1636 static struct builtincmd *EXECCMD;
1637 static struct builtincmd *EVALCMD;
1640 #define JOBSTOPPED 1 /* all procs are stopped */
1641 #define JOBDONE 2 /* all procs are completed */
1644 * A job structure contains information about a job. A job is either a
1645 * single process or a set of processes contained in a pipeline. In the
1646 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
1651 pid_t pid; /* process id */
1652 int status; /* status flags (defined above) */
1653 char *cmd; /* text of command being run */
1657 static int job_warning; /* user was warned about stopped jobs */
1659 #ifdef CONFIG_ASH_JOB_CONTROL
1660 static void setjobctl(int enable);
1662 #define setjobctl(on) /* do nothing */
1667 struct procstat ps0; /* status of process */
1668 struct procstat *ps; /* status or processes when more than one */
1669 short nprocs; /* number of processes */
1670 short pgrp; /* process group of this job */
1671 char state; /* true if job is finished */
1672 char used; /* true if this entry is in used */
1673 char changed; /* true if status has changed */
1674 #ifdef CONFIG_ASH_JOB_CONTROL
1675 char jobctl; /* job running under job control */
1679 static struct job *jobtab; /* array of jobs */
1680 static int njobs; /* size of array */
1681 static int backgndpid = -1; /* pid of last background process */
1683 #ifdef CONFIG_ASH_JOB_CONTROL
1684 static int initialpgrp; /* pgrp of shell on invocation */
1685 static int curjob; /* current job */
1689 static struct job *makejob(const union node *, int);
1690 static int forkshell(struct job *, const union node *, int);
1691 static int waitforjob(struct job *);
1693 static int docd(char *, int);
1694 static void getpwd(void);
1696 static char *padvance(const char **, const char *);
1698 static char nullstr[1]; /* zero length string */
1699 static char *curdir = nullstr; /* current working directory */
1701 static int cdcmd(int argc, char **argv)
1710 if ((dest = *argptr) == NULL && (dest = bltinlookup("HOME")) == NULL)
1711 error("HOME not set");
1714 if (dest[0] == '-' && dest[1] == '\0') {
1715 dest = bltinlookup("OLDPWD");
1716 if (!dest || !*dest) {
1725 if (*dest == '/' || (path = bltinlookup("CDPATH")) == NULL)
1727 while ((p = padvance(&path, dest)) != NULL) {
1728 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
1733 if (p[0] == '.' && p[1] == '/' && p[2] != '\0')
1735 print = strcmp(p, dest);
1737 if (docd(p, print) >= 0)
1742 error("can't cd to %s", dest);
1748 * Update curdir (the name of the current directory) in response to a
1749 * cd command. We also call hashcd to let the routines in exec.c know
1750 * that the current directory has changed.
1753 static void hashcd(void);
1755 static inline void updatepwd(const char *dir)
1757 hashcd(); /* update command hash table */
1760 * If our argument is NULL, we don't know the current directory
1762 if (dir == NULL || curdir == nullstr) {
1770 * Actually do the chdir. In an interactive shell, print the
1771 * directory name if "print" is nonzero.
1774 static int docd(char *dest, int print)
1776 TRACE(("docd(\"%s\", %d) called\n", dest, print));
1778 if (chdir(dest) < 0) {
1790 static int pwdcmd(int argc, char **argv)
1796 /* Ask system the current directory */
1797 static void getpwd(void)
1799 curdir = xgetcwd(0);
1804 static void setpwd(const char *val, int setold)
1809 setvar("OLDPWD", curdir, VEXPORT);
1812 if (curdir != nullstr) {
1813 if (val != NULL && *val != '/')
1814 val = cated = concat_path_file(curdir, val);
1820 curdir = simplify_path(val);
1823 setvar("PWD", curdir, VEXPORT);
1827 * Errors and exceptions.
1831 * Code to handle exceptions in C.
1835 * We enclose jmp_buf in a structure so that we can declare pointers to
1836 * jump locations. The global variable handler contains the location to
1837 * jump to when an exception occurs, and the global variable exception
1838 * contains a code identifying the exeception. To implement nested
1839 * exception handlers, the user should save the value of handler on entry
1840 * to an inner scope, set handler to point to a jmploc structure for the
1841 * inner scope, and restore handler on exit from the scope.
1849 #define EXINT 0 /* SIGINT received */
1850 #define EXERROR 1 /* a generic error */
1851 #define EXSHELLPROC 2 /* execute a shell procedure */
1852 #define EXEXEC 3 /* command execution failed */
1853 #define EXREDIR 4 /* redirection error */
1855 static struct jmploc *handler;
1856 static int exception;
1858 static void exverror(int, const char *, va_list)
1859 __attribute__ ((__noreturn__));
1862 * Called to raise an exception. Since C doesn't include exceptions, we
1863 * just do a longjmp to the exception handler. The type of exception is
1864 * stored in the global variable "exception".
1867 static void exraise(int) __attribute__ ((__noreturn__));
1869 static void exraise(int e)
1872 if (handler == NULL)
1877 longjmp(handler->loc, 1);
1882 * Called from trap.c when a SIGINT is received. (If the user specifies
1883 * that SIGINT is to be trapped or ignored using the trap builtin, then
1884 * this routine is not called.) Suppressint is nonzero when interrupts
1885 * are held using the INTOFF macro. The call to _exit is necessary because
1886 * there is a short period after a fork before the signal handlers are
1887 * set to the appropriate value for the child. (The test for iflag is
1888 * just defensive programming.)
1891 static void onint(void)
1900 sigemptyset(&mysigset);
1901 sigprocmask(SIG_SETMASK, &mysigset, NULL);
1902 if (!(rootshell && iflag)) {
1903 signal(SIGINT, SIG_DFL);
1911 static char *commandname; /* currently executing command */
1914 * Exverror is called to raise the error exception. If the first argument
1915 * is not NULL then error prints an error message using printf style
1916 * formatting. It then raises the error exception.
1918 static void exverror(int cond, const char *msg, va_list ap)
1925 TRACE(("exverror(%d, \"%s\") pid=%d\n", cond, msg, getpid()));
1927 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
1931 out2fmt("%s: ", commandname);
1932 vfprintf(stderr, msg, ap);
1940 static void error(const char *msg, ...)
1945 exverror(EXERROR, msg, ap);
1951 static void exerror(int cond, const char *msg, ...)
1956 exverror(cond, msg, ap);
1964 * Table of error messages.
1968 short errcode; /* error number */
1969 short action; /* operation which encountered the error */
1973 * Types of operations (passed to the errmsg routine).
1976 #define E_OPEN 01 /* opening a file */
1977 #define E_CREAT 02 /* creating a file */
1978 #define E_EXEC 04 /* executing a program */
1980 #define ALL (E_OPEN|E_CREAT|E_EXEC)
1982 static const struct errname errormsg[] = {
2036 #define ERRNAME_SIZE (sizeof(errormsg)/sizeof(struct errname))
2039 * Return a string describing an error. The returned string may be a
2040 * pointer to a static buffer that will be overwritten on the next call.
2041 * Action describes the operation that got the error.
2044 static const char *errmsg(int e, int action)
2046 struct errname const *ep;
2047 static char buf[12];
2049 for (ep = errormsg; ep < errormsg + ERRNAME_SIZE; ep++) {
2050 if (ep->errcode == e && (ep->action & action) != 0)
2054 snprintf(buf, sizeof buf, "error %d", e);
2059 #ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
2060 static void __inton()
2062 if (--suppressint == 0 && intpending) {
2066 static void forceinton(void)
2074 /* flags in argument to evaltree */
2075 #define EV_EXIT 01 /* exit after evaluating tree */
2076 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
2077 #define EV_BACKCMD 04 /* command executing within back quotes */
2079 static int evalskip; /* set if we are skipping commands */
2080 static int skipcount; /* number of levels to skip */
2081 static int loopnest; /* current loop nesting level */
2082 static int funcnest; /* depth of function calls */
2085 static struct strlist *cmdenviron; /* environment for builtin command */
2086 static int exitstatus; /* exit status of last command */
2087 static int oexitstatus; /* saved exit status */
2089 static void evalsubshell(const union node *, int);
2090 static void expredir(union node *);
2091 static void prehash(union node *);
2092 static void eprintlist(struct strlist *);
2094 static union node *parsecmd(int);
2097 * Called to reset things after an exception.
2101 * The eval commmand.
2103 static void evalstring(char *, int);
2105 static int evalcmd(int argc, char **argv)
2114 STARTSTACKSTR(concat);
2118 STPUTC(*p++, concat);
2119 if ((p = *ap++) == NULL)
2121 STPUTC(' ', concat);
2123 STPUTC('\0', concat);
2124 p = grabstackstr(concat);
2126 evalstring(p, EV_TESTED);
2132 * Execute a command or commands contained in a string.
2135 static void evaltree(union node *, int);
2136 static void setinputstring(char *);
2137 static void popfile(void);
2138 static void setstackmark(struct stackmark *mark);
2139 static void popstackmark(struct stackmark *mark);
2142 static void evalstring(char *s, int flag)
2145 struct stackmark smark;
2147 setstackmark(&smark);
2149 while ((n = parsecmd(0)) != NEOF) {
2151 popstackmark(&smark);
2154 popstackmark(&smark);
2157 static struct builtincmd *find_builtin(const char *);
2158 static void expandarg(union node *, struct arglist *, int);
2159 static void calcsize(const union node *);
2160 static union node *copynode(const union node *);
2163 * Make a copy of a parse tree.
2166 static int funcblocksize; /* size of structures in function */
2167 static int funcstringsize; /* size of strings in node */
2168 static pointer funcblock; /* block to allocate function from */
2169 static char *funcstring; /* block to allocate strings from */
2172 static inline union node *copyfunc(union node *n)
2179 funcblock = xmalloc(funcblocksize + funcstringsize);
2180 funcstring = (char *) funcblock + funcblocksize;
2185 * Add a new command entry, replacing any existing command entry for
2189 static inline void addcmdentry(char *name, struct cmdentry *entry)
2191 struct tblentry *cmdp;
2194 cmdp = cmdlookup(name, 1);
2195 if (cmdp->cmdtype == CMDFUNCTION) {
2196 free(cmdp->param.func);
2198 cmdp->cmdtype = entry->cmdtype;
2199 cmdp->param = entry->u;
2203 static inline void evalloop(const union node *n, int flags)
2211 evaltree(n->nbinary.ch1, EV_TESTED);
2213 skipping:if (evalskip == SKIPCONT && --skipcount <= 0) {
2217 if (evalskip == SKIPBREAK && --skipcount <= 0)
2221 if (n->type == NWHILE) {
2222 if (exitstatus != 0)
2225 if (exitstatus == 0)
2228 evaltree(n->nbinary.ch2, flags);
2229 status = exitstatus;
2234 exitstatus = status;
2237 static void evalfor(const union node *n, int flags)
2239 struct arglist arglist;
2242 struct stackmark smark;
2244 setstackmark(&smark);
2245 arglist.lastp = &arglist.list;
2246 for (argp = n->nfor.args; argp; argp = argp->narg.next) {
2247 oexitstatus = exitstatus;
2248 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
2252 *arglist.lastp = NULL;
2257 for (sp = arglist.list; sp; sp = sp->next) {
2258 setvar(n->nfor.var, sp->text, 0);
2259 evaltree(n->nfor.body, flags);
2261 if (evalskip == SKIPCONT && --skipcount <= 0) {
2265 if (evalskip == SKIPBREAK && --skipcount <= 0)
2272 popstackmark(&smark);
2275 static inline void evalcase(const union node *n, int flags)
2279 struct arglist arglist;
2280 struct stackmark smark;
2282 setstackmark(&smark);
2283 arglist.lastp = &arglist.list;
2284 oexitstatus = exitstatus;
2285 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
2286 for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) {
2287 for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) {
2288 if (casematch(patp, arglist.list->text)) {
2289 if (evalskip == 0) {
2290 evaltree(cp->nclist.body, flags);
2297 popstackmark(&smark);
2301 * Evaluate a pipeline. All the processes in the pipeline are children
2302 * of the process creating the pipeline. (This differs from some versions
2303 * of the shell, which make the last process in a pipeline the parent
2307 static inline void evalpipe(union node *n, int flags)
2310 struct nodelist *lp;
2315 TRACE(("evalpipe(0x%lx) called\n", (long) n));
2317 for (lp = n->npipe.cmdlist; lp; lp = lp->next)
2321 jp = makejob(n, pipelen);
2323 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
2327 if (pipe(pip) < 0) {
2329 error("Pipe call failed");
2332 if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
2345 evaltree(lp->n, flags);
2352 if (n->npipe.backgnd == 0) {
2353 exitstatus = waitforjob(jp);
2354 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
2359 static void find_command(const char *, struct cmdentry *, int, const char *);
2361 static int isassignment(const char *word)
2363 if (!is_name(*word)) {
2368 } while (is_in_name(*word));
2369 return *word == '=';
2373 static void evalcommand(union node *cmd, int flags)
2375 struct stackmark smark;
2377 struct arglist arglist;
2378 struct arglist varlist;
2384 struct cmdentry cmdentry;
2386 char *volatile savecmdname;
2387 volatile struct shparam saveparam;
2388 struct localvar *volatile savelocalvars;
2393 struct jmploc *volatile savehandler;
2394 struct jmploc jmploc;
2397 /* Avoid longjmp clobbering */
2405 /* First expand the arguments. */
2406 TRACE(("evalcommand(0x%lx, %d) called\n", (long) cmd, flags));
2407 setstackmark(&smark);
2408 arglist.lastp = &arglist.list;
2409 varlist.lastp = &varlist.list;
2411 oexitstatus = exitstatus;
2414 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
2415 expandarg(argp, &varlist, EXP_VARTILDE);
2417 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
2418 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
2420 *arglist.lastp = NULL;
2421 *varlist.lastp = NULL;
2422 expredir(cmd->ncmd.redirect);
2424 for (sp = arglist.list; sp; sp = sp->next)
2426 argv = stalloc(sizeof(char *) * (argc + 1));
2428 for (sp = arglist.list; sp; sp = sp->next) {
2429 TRACE(("evalcommand arg: %s\n", sp->text));
2434 if (iflag && funcnest == 0 && argc > 0)
2438 /* Print the command if xflag is set. */
2441 eprintlist(varlist.list);
2442 eprintlist(arglist.list);
2446 /* Now locate the command. */
2448 cmdentry.cmdtype = CMDBUILTIN;
2449 cmdentry.u.cmd = BLTINCMD;
2452 const char *oldpath;
2453 int findflag = DO_ERR;
2457 * Modify the command lookup path, if a PATH= assignment
2460 for (sp = varlist.list; sp; sp = sp->next)
2461 if (varequal(sp->text, defpathvar)) {
2462 path = sp->text + 5;
2463 findflag |= DO_BRUTE;
2466 oldfindflag = findflag;
2469 find_command(argv[0], &cmdentry, findflag, path);
2470 if (cmdentry.cmdtype == CMDUNKNOWN) { /* command not found */
2474 /* implement bltin and command here */
2475 if (cmdentry.cmdtype != CMDBUILTIN) {
2478 if (spclbltin < 0) {
2479 spclbltin = !!(IS_BUILTIN_SPECIAL(cmdentry.u.cmd)) * 2;
2481 if (cmdentry.u.cmd == BLTINCMD) {
2483 struct builtincmd *bcmd;
2488 if (!(bcmd = find_builtin(*argv))) {
2489 out2fmt("%s: not found\n", *argv);
2493 cmdentry.u.cmd = bcmd;
2494 if (bcmd != BLTINCMD)
2498 if (cmdentry.u.cmd == find_builtin("command")) {
2503 if (*argv[0] == '-') {
2504 if (!equal(argv[0], "-p")) {
2514 findflag |= DO_BRUTE;
2517 findflag = oldfindflag;
2519 findflag |= DO_NOFUN;
2527 /* Fork off a child process if necessary. */
2528 if (cmd->ncmd.backgnd
2529 || (cmdentry.cmdtype == CMDNORMAL && (!(flags & EV_EXIT) || trap[0]))
2532 jp = makejob(cmd, 1);
2533 mode = cmd->ncmd.backgnd;
2534 if (forkshell(jp, cmd, mode) != 0)
2535 goto parent; /* at end of routine */
2542 /* This is the child process if a fork occurred. */
2543 /* Execute the command. */
2544 if (cmdentry.cmdtype == CMDFUNCTION) {
2546 trputs("Shell function: ");
2549 exitstatus = oexitstatus;
2550 saveparam = shellparam;
2551 shellparam.malloc = 0;
2552 shellparam.nparam = argc - 1;
2553 shellparam.p = argv + 1;
2555 savelocalvars = localvars;
2558 if (setjmp(jmploc.loc)) {
2559 if (exception == EXREDIR) {
2563 saveparam.optind = shellparam.optind;
2564 saveparam.optoff = shellparam.optoff;
2565 freeparam(&shellparam);
2566 shellparam = saveparam;
2568 localvars = savelocalvars;
2569 handler = savehandler;
2570 longjmp(handler->loc, 1);
2572 savehandler = handler;
2574 redirect(cmd->ncmd.redirect, REDIR_PUSH);
2575 listsetvar(varlist.list);
2577 evaltree(cmdentry.u.func, flags & EV_TESTED);
2582 localvars = savelocalvars;
2583 saveparam.optind = shellparam.optind;
2584 saveparam.optoff = shellparam.optoff;
2585 freeparam(&shellparam);
2586 shellparam = saveparam;
2587 handler = savehandler;
2590 if (evalskip == SKIPFUNC) {
2594 } else if (cmdentry.cmdtype == CMDBUILTIN) {
2598 trputs("builtin command: ");
2601 redir = (cmdentry.u.cmd == EXECCMD) ? 0 : REDIR_PUSH;
2602 savecmdname = commandname;
2604 listsetvar(varlist.list);
2606 cmdenviron = varlist.list;
2609 if (setjmp(jmploc.loc)) {
2611 exitstatus = (e == EXINT) ? SIGINT + 128 : 2;
2614 savehandler = handler;
2616 redirect(cmd->ncmd.redirect, redir);
2617 commandname = argv[0];
2619 optptr = NULL; /* initialize nextopt */
2620 exitstatus = (*cmdentry.u.cmd->builtinfunc) (argc, argv);
2624 commandname = savecmdname;
2625 handler = savehandler;
2627 if (e == EXINT || spclbltin & 2) {
2633 if (cmdentry.u.cmd != EXECCMD)
2637 trputs("normal command: ");
2640 redirect(cmd->ncmd.redirect, 0);
2642 for (sp = varlist.list; sp; sp = sp->next)
2643 setvareq(sp->text, VEXPORT | VSTACK);
2644 envp = environment();
2645 shellexec(argv, envp, path, cmdentry.u.index);
2647 if (flags & EV_EXIT)
2648 exitshell(exitstatus);
2651 parent: /* parent process gets here (if we forked) */
2652 if (mode == 0) { /* argument to fork */
2653 exitstatus = waitforjob(jp);
2659 setvar("_", lastarg, 0);
2660 popstackmark(&smark);
2664 * Evaluate a parse tree. The value is left in the global variable
2667 static void evaltree(union node *n, int flags)
2672 TRACE(("evaltree(NULL) called\n"));
2675 TRACE(("evaltree(0x%lx: %d) called\n", (long) n, n->type));
2678 evaltree(n->nbinary.ch1, flags & EV_TESTED);
2681 evaltree(n->nbinary.ch2, flags);
2684 evaltree(n->nbinary.ch1, EV_TESTED);
2685 if (evalskip || exitstatus != 0)
2687 evaltree(n->nbinary.ch2, flags);
2690 evaltree(n->nbinary.ch1, EV_TESTED);
2691 if (evalskip || exitstatus == 0)
2693 evaltree(n->nbinary.ch2, flags);
2696 expredir(n->nredir.redirect);
2697 redirect(n->nredir.redirect, REDIR_PUSH);
2698 evaltree(n->nredir.n, flags);
2702 evalsubshell(n, flags);
2705 evalsubshell(n, flags);
2708 evaltree(n->nif.test, EV_TESTED);
2711 if (exitstatus == 0)
2712 evaltree(n->nif.ifpart, flags);
2713 else if (n->nif.elsepart)
2714 evaltree(n->nif.elsepart, flags);
2730 struct builtincmd *bcmd;
2731 struct cmdentry entry;
2733 if ((bcmd = find_builtin(n->narg.text)) && IS_BUILTIN_SPECIAL(bcmd)
2735 out2fmt("%s is a special built-in\n", n->narg.text);
2739 entry.cmdtype = CMDFUNCTION;
2740 entry.u.func = copyfunc(n->narg.next);
2741 addcmdentry(n->narg.text, &entry);
2746 evaltree(n->nnot.com, EV_TESTED);
2747 exitstatus = !exitstatus;
2755 evalcommand(n, flags);
2760 printf("Node type = %d\n", n->type);
2767 if (flags & EV_EXIT ||
2768 (checkexit && eflag && exitstatus && !(flags & EV_TESTED))
2770 exitshell(exitstatus);
2774 * Kick off a subshell to evaluate a tree.
2777 static void evalsubshell(const union node *n, int flags)
2780 int backgnd = (n->type == NBACKGND);
2782 expredir(n->nredir.redirect);
2783 if (!backgnd && flags & EV_EXIT && !trap[0])
2787 if (forkshell(jp, n, backgnd) == 0) {
2791 flags &= ~EV_TESTED;
2793 redirect(n->nredir.redirect, 0);
2794 evaltree(n->nredir.n, flags); /* never returns */
2797 exitstatus = waitforjob(jp);
2803 * Compute the names of the files in a redirection list.
2806 static void fixredir(union node *n, const char *text, int err);
2808 static void expredir(union node *n)
2812 for (redir = n; redir; redir = redir->nfile.next) {
2815 fn.lastp = &fn.list;
2816 oexitstatus = exitstatus;
2817 switch (redir->type) {
2823 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
2824 redir->nfile.expfname = fn.list->text;
2828 if (redir->ndup.vname) {
2829 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
2830 fixredir(redir, fn.list->text, 1);
2839 * Execute a command inside back quotes. If it's a builtin command, we
2840 * want to save its output in a block obtained from malloc. Otherwise
2841 * we fork off a subprocess and get the output of the command via a pipe.
2842 * Should be called with interrupts off.
2845 static void evalbackcmd(union node *n, struct backcmd *result)
2849 struct stackmark smark; /* unnecessary */
2851 setstackmark(&smark);
2862 error("Pipe call failed");
2864 if (forkshell(jp, n, FORK_NOJOB) == 0) {
2869 dup_as_newfd(pip[1], 1);
2873 evaltree(n, EV_EXIT);
2876 result->fd = pip[0];
2879 popstackmark(&smark);
2880 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
2881 result->fd, result->buf, result->nleft, result->jp));
2886 * Execute a simple command.
2890 * Search for a command. This is called before we fork so that the
2891 * location of the command will be available in the parent as well as
2892 * the child. The check for "goodname" is an overly conservative
2893 * check that the name will not be subject to expansion.
2896 static void prehash(union node *n)
2898 struct cmdentry entry;
2900 if (n->type == NCMD && n->ncmd.args)
2901 if (goodname(n->ncmd.args->narg.text))
2902 find_command(n->ncmd.args->narg.text, &entry, 0, pathval());
2907 * Builtin commands. Builtin commands whose functions are closely
2908 * tied to evaluation are implemented here.
2912 * No command given, or a bltin command with no arguments. Set the
2913 * specified variables.
2916 int bltincmd(int argc, char **argv)
2919 * Preserve exitstatus of a previous possible redirection
2927 * Handle break and continue commands. Break, continue, and return are
2928 * all handled by setting the evalskip flag. The evaluation routines
2929 * above all check this flag, and if it is set they start skipping
2930 * commands rather than executing them. The variable skipcount is
2931 * the number of loops to break/continue, or the number of function
2932 * levels to return. (The latter is always 1.) It should probably
2933 * be an error to break out of more loops than exist, but it isn't
2934 * in the standard shell so we don't make it one here.
2937 static int breakcmd(int argc, char **argv)
2939 int n = argc > 1 ? number(argv[1]) : 1;
2942 error("Illegal number: %s", argv[1]);
2946 evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK;
2954 * The return command.
2957 static int returncmd(int argc, char **argv)
2959 int ret = argc > 1 ? number(argv[1]) : oexitstatus;
2962 evalskip = SKIPFUNC;
2966 /* Do what ksh does; skip the rest of the file */
2967 evalskip = SKIPFILE;
2974 #ifndef CONFIG_FALSE
2975 static int false_main(int argc, char **argv)
2982 static int true_main(int argc, char **argv)
2989 * Controls whether the shell is interactive or not.
2992 static void setsignal(int signo);
2994 #ifdef CONFIG_ASH_MAIL
2995 static void chkmail(int silent);
2998 static void setinteractive(int on)
3000 static int is_interactive;
3001 static int do_banner = 0;
3003 if (on == is_interactive)
3008 #ifdef CONFIG_ASH_MAIL
3011 is_interactive = on;
3012 if (do_banner == 0 && is_interactive) {
3013 /* Looks like they want an interactive shell */
3014 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
3015 printf("\n\n" BB_BANNER " Built-in shell (ash)\n");
3016 printf("Enter 'help' for a list of built-in commands.\n\n");
3022 static void optschanged(void)
3024 setinteractive(iflag);
3029 static int execcmd(int argc, char **argv)
3034 iflag = 0; /* exit on error */
3037 for (sp = cmdenviron; sp; sp = sp->next)
3038 setvareq(sp->text, VEXPORT | VSTACK);
3039 shellexec(argv + 1, environment(), pathval(), 0);
3044 static void eprintlist(struct strlist *sp)
3046 for (; sp; sp = sp->next) {
3047 out2fmt(" %s", sp->text);
3052 * Exec a program. Never returns. If you change this routine, you may
3053 * have to change the find_command routine as well.
3056 static const char *pathopt; /* set by padvance */
3058 static void shellexec(char **argv, char **envp, const char *path, int idx)
3063 if (strchr(argv[0], '/') != NULL
3064 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3065 || find_applet_by_name(argv[0])
3069 tryexec(argv[0], argv, envp);
3073 while ((cmdname = padvance(&path, argv[0])) != NULL) {
3074 if (--idx < 0 && pathopt == NULL) {
3075 tryexec(cmdname, argv, envp);
3076 if (errno != ENOENT && errno != ENOTDIR)
3083 /* Map to POSIX errors */
3095 exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
3100 * Clear traps on a fork.
3102 static void clear_traps(void)
3106 for (tp = trap; tp < &trap[NSIG]; tp++) {
3107 if (*tp && **tp) { /* trap not NULL or SIG_IGN */
3112 setsignal(tp - trap);
3119 static int preadbuffer(void);
3120 static void pushfile(void);
3123 * Read a character from the script, returning PEOF on end of file.
3124 * Nul characters in the input are silently discarded.
3127 #ifndef CONFIG_ASH_OPTIMIZE_FOR_SIZE
3128 #define pgetc_macro() (--parsenleft >= 0? *parsenextc++ : preadbuffer())
3129 static int pgetc(void)
3131 return pgetc_macro();
3134 static int pgetc_macro(void)
3136 return --parsenleft >= 0 ? *parsenextc++ : preadbuffer();
3139 static inline int pgetc(void)
3141 return pgetc_macro();
3147 * Undo the last call to pgetc. Only one character may be pushed back.
3148 * PEOF may be pushed back.
3151 static void pungetc(void)
3158 static void popfile(void)
3160 struct parsefile *pf = parsefile;
3168 parsefile = pf->prev;
3170 parsenleft = parsefile->nleft;
3171 parselleft = parsefile->lleft;
3172 parsenextc = parsefile->nextc;
3173 plinno = parsefile->linno;
3179 * Return to top level.
3182 static void popallfiles(void)
3184 while (parsefile != &basepf)
3189 * Close the file(s) that the shell is reading commands from. Called
3190 * after a fork is done.
3193 static void closescript(void)
3196 if (parsefile->fd > 0) {
3197 close(parsefile->fd);
3204 * Like setinputfile, but takes an open file descriptor. Call this with
3208 static void setinputfd(int fd, int push)
3210 (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
3216 while (parsefile->strpush)
3220 if (parsefile->buf == NULL)
3221 parsefile->buf = xmalloc(BUFSIZ);
3222 parselleft = parsenleft = 0;
3228 * Set the input to take input from a file. If push is set, push the
3229 * old input onto the stack first.
3232 static void setinputfile(const char *fname, int push)
3238 if ((fd = open(fname, O_RDONLY)) < 0)
3239 error("Can't open %s", fname);
3241 myfileno2 = dup_as_newfd(fd, 10);
3244 error("Out of file descriptors");
3247 setinputfd(fd, push);
3252 static void tryexec(char *cmd, char **argv, char **envp)
3256 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3258 char **argv_l = argv;
3261 #ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
3262 name = get_last_path_component(name);
3265 for (argc_l = 0; *argv_l != NULL; argv_l++, argc_l++)
3268 for (argc_l = 0; *argv_l != NULL; argv_l++, argc_l++)
3270 run_applet_by_name(name, argc_l, argv);
3273 execve(cmd, argv, envp);
3276 } else if (errno == ENOEXEC) {
3280 for (ap = argv; *ap; ap++);
3281 ap = new = xmalloc((ap - argv + 2) * sizeof(char *));
3282 *ap++ = cmd = "/bin/sh";
3283 while ((*ap++ = *argv++));
3289 static char *commandtext(const union node *);
3292 * Do a path search. The variable path (passed by reference) should be
3293 * set to the start of the path before the first call; padvance will update
3294 * this value as it proceeds. Successive calls to padvance will return
3295 * the possible path expansions in sequence. If an option (indicated by
3296 * a percent sign) appears in the path entry then the global variable
3297 * pathopt will be set to point to it; otherwise pathopt will be set to
3301 static const char *pathopt;
3303 static void growstackblock(void);
3306 static char *padvance(const char **path, const char *name)
3316 for (p = start; *p && *p != ':' && *p != '%'; p++);
3317 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
3318 while (stackblocksize() < len)
3322 memcpy(q, start, p - start);
3330 while (*p && *p != ':')
3337 return stalloc(len);
3341 * Wrapper around strcmp for qsort/bsearch/...
3343 static int pstrcmp(const void *a, const void *b)
3345 return strcmp((const char *) a, (*(const char *const *) b) + 1);
3349 * Find a keyword is in a sorted array.
3352 static const char *const *findkwd(const char *s)
3354 return bsearch(s, tokname_array + KWDOFFSET,
3355 (sizeof(tokname_array) / sizeof(const char *)) - KWDOFFSET,
3356 sizeof(const char *), pstrcmp);
3360 /*** Command hashing code ***/
3362 static int hashcmd(int argc, char **argv)
3364 struct tblentry **pp;
3365 struct tblentry *cmdp;
3368 struct cmdentry entry;
3371 #ifdef CONFIG_ASH_ALIAS
3372 const struct alias *ap;
3376 while ((c = nextopt("rvV")) != '\0') {
3380 } else if (c == 'v' || c == 'V') {
3384 if (*argptr == NULL) {
3385 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
3386 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
3387 if (cmdp->cmdtype != CMDBUILTIN) {
3388 printentry(cmdp, verbose);
3395 while ((name = *argptr++) != NULL) {
3396 if ((cmdp = cmdlookup(name, 0)) != NULL
3397 && (cmdp->cmdtype == CMDNORMAL
3398 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
3400 #ifdef CONFIG_ASH_ALIAS
3401 /* Then look at the aliases */
3402 if ((ap = *__lookupalias(name)) != NULL) {
3404 printf("%s is an alias for %s\n", name, ap->val);
3410 /* First look at the keywords */
3411 if (findkwd(name) != 0) {
3413 printf("%s is a shell keyword\n", name);
3419 find_command(name, &entry, DO_ERR, pathval());
3420 if (entry.cmdtype == CMDUNKNOWN)
3423 cmdp = cmdlookup(name, 0);
3425 printentry(cmdp, verbose == 'v');
3432 static void printentry(struct tblentry *cmdp, int verbose)
3438 printf("%s%s", cmdp->cmdname, (verbose ? " is " : ""));
3439 if (cmdp->cmdtype == CMDNORMAL) {
3440 idx = cmdp->param.index;
3443 name = padvance(&path, cmdp->cmdname);
3445 } while (--idx >= 0);
3448 } else if (cmdp->cmdtype == CMDBUILTIN) {
3450 out1str("a shell builtin");
3451 } else if (cmdp->cmdtype == CMDFUNCTION) {
3454 out1str("a function\n");
3455 name = commandtext(cmdp->param.func);
3456 printf("%s() {\n %s\n}", cmdp->cmdname, name);
3462 error("internal error: cmdtype %d", cmdp->cmdtype);
3465 puts(cmdp->rehash ? "*" : nullstr);
3470 /*** List the available builtins ***/
3473 static int helpcmd(int argc, char **argv)
3477 printf("\nBuilt-in commands:\n-------------------\n");
3478 for (col = 0, i = 0; i < NUMBUILTINS; i++) {
3479 col += printf("%c%s", ((col == 0) ? '\t' : ' '),
3480 builtincmds[i].name + 1);
3486 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3488 extern const struct BB_applet applets[];
3489 extern const size_t NUM_APPLETS;
3491 for (i = 0; i < NUM_APPLETS; i++) {
3493 col += printf("%c%s", ((col == 0) ? '\t' : ' '), applets[i].name);
3502 return EXIT_SUCCESS;
3506 * Resolve a command name. If you change this routine, you may have to
3507 * change the shellexec routine as well.
3510 static int prefix(const char *, const char *);
3513 find_command(const char *name, struct cmdentry *entry, int act,
3516 struct tblentry *cmdp;
3526 struct builtincmd *bcmd;
3528 /* If name contains a slash, don't use the hash table */
3529 if (strchr(name, '/') != NULL) {
3531 while (stat(name, &statb) < 0) {
3532 if (errno != ENOENT && errno != ENOTDIR)
3534 entry->cmdtype = CMDUNKNOWN;
3535 entry->u.index = -1;
3538 entry->cmdtype = CMDNORMAL;
3539 entry->u.index = -1;
3542 entry->cmdtype = CMDNORMAL;
3547 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3548 if (find_applet_by_name(name)) {
3549 entry->cmdtype = CMDNORMAL;
3550 entry->u.index = -1;
3556 if (act & DO_BRUTE) {
3557 firstchange = path_change(path, &bltin);
3563 /* If name is in the table, and not invalidated by cd, we're done */
3564 if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0) {
3565 if (cmdp->cmdtype == CMDFUNCTION) {
3566 if (act & DO_NOFUN) {
3571 } else if (act & DO_BRUTE) {
3572 if ((cmdp->cmdtype == CMDNORMAL &&
3573 cmdp->param.index >= firstchange) ||
3574 (cmdp->cmdtype == CMDBUILTIN &&
3575 ((builtinloc < 0 && bltin >= 0) ?
3576 bltin : builtinloc) >= firstchange)) {
3577 /* need to recompute the entry */
3586 bcmd = find_builtin(name);
3587 regular = bcmd && IS_BUILTIN_REGULAR(bcmd);
3590 if (cmdp && (cmdp->cmdtype == CMDBUILTIN)) {
3593 } else if (act & DO_BRUTE) {
3594 if (firstchange == 0) {
3599 /* If %builtin not in path, check for builtin next */
3600 if (regular || (bltin < 0 && bcmd)) {
3603 entry->cmdtype = CMDBUILTIN;
3604 entry->u.cmd = bcmd;
3608 cmdp = cmdlookup(name, 1);
3609 cmdp->cmdtype = CMDBUILTIN;
3610 cmdp->param.cmd = bcmd;
3615 /* We have to search path. */
3616 prev = -1; /* where to start */
3617 if (cmdp && cmdp->rehash) { /* doing a rehash */
3618 if (cmdp->cmdtype == CMDBUILTIN)
3621 prev = cmdp->param.index;
3627 while ((fullname = padvance(&path, name)) != NULL) {
3628 stunalloc(fullname);
3630 if (idx >= firstchange) {
3634 if (prefix("builtin", pathopt)) {
3635 if ((bcmd = find_builtin(name))) {
3639 } else if (!(act & DO_NOFUN) && prefix("func", pathopt)) {
3642 continue; /* ignore unimplemented options */
3645 /* if rehash, don't redo absolute path names */
3646 if (fullname[0] == '/' && idx <= prev && idx < firstchange) {
3649 TRACE(("searchexec \"%s\": no change\n", name));
3652 while (stat(fullname, &statb) < 0) {
3653 if (errno != ENOENT && errno != ENOTDIR)
3657 e = EACCES; /* if we fail, this will be the error */
3658 if (!S_ISREG(statb.st_mode))
3660 if (pathopt) { /* this is a %func directory */
3661 stalloc(strlen(fullname) + 1);
3662 readcmdfile(fullname);
3663 if ((cmdp = cmdlookup(name, 0)) == NULL
3664 || cmdp->cmdtype != CMDFUNCTION)
3665 error("%s not defined in %s", name, fullname);
3666 stunalloc(fullname);
3669 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
3670 /* If we aren't called with DO_BRUTE and cmdp is set, it must
3671 be a function and we're being called with DO_NOFUN */
3673 entry->cmdtype = CMDNORMAL;
3674 entry->u.index = idx;
3678 cmdp = cmdlookup(name, 1);
3679 cmdp->cmdtype = CMDNORMAL;
3680 cmdp->param.index = idx;
3685 /* We failed. If there was an entry for this command, delete it */
3686 if (cmdp && updatetbl)
3689 out2fmt("%s: %s\n", name, errmsg(e, E_EXEC));
3690 entry->cmdtype = CMDUNKNOWN;
3695 entry->cmdtype = cmdp->cmdtype;
3696 entry->u = cmdp->param;
3702 * Search the table of builtin commands.
3705 static struct builtincmd *find_builtin(const char *name)
3707 struct builtincmd *bp;
3709 bp = bsearch(name, builtincmds, NUMBUILTINS, sizeof(struct builtincmd),
3716 * Called when a cd is done. Marks all commands so the next time they
3717 * are executed they will be rehashed.
3720 static void hashcd(void)
3722 struct tblentry **pp;
3723 struct tblentry *cmdp;
3725 for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) {
3726 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
3727 if (cmdp->cmdtype == CMDNORMAL
3728 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
3737 * Called before PATH is changed. The argument is the new value of PATH;
3738 * pathval() still returns the old value at this point. Called with
3742 static void changepath(const char *newval)
3747 firstchange = path_change(newval, &bltin);
3748 if (builtinloc < 0 && bltin >= 0)
3749 builtinloc = bltin; /* zap builtins */
3750 clearcmdentry(firstchange);
3752 /* Ensure that getenv("PATH") stays current */
3753 setenv("PATH", newval, 1);
3758 * Clear out command entries. The argument specifies the first entry in
3759 * PATH which has changed.
3762 static void clearcmdentry(int firstchange)
3764 struct tblentry **tblp;
3765 struct tblentry **pp;
3766 struct tblentry *cmdp;
3769 for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) {
3771 while ((cmdp = *pp) != NULL) {
3772 if ((cmdp->cmdtype == CMDNORMAL &&
3773 cmdp->param.index >= firstchange)
3774 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= firstchange)) {
3787 * Locate a command in the command hash table. If "add" is nonzero,
3788 * add the command to the table if it is not already present. The
3789 * variable "lastcmdentry" is set to point to the address of the link
3790 * pointing to the entry, so that delete_cmd_entry can delete the
3794 static struct tblentry **lastcmdentry;
3796 static struct tblentry *cmdlookup(const char *name, int add)
3800 struct tblentry *cmdp;
3801 struct tblentry **pp;
3808 pp = &cmdtable[hashval % CMDTABLESIZE];
3809 for (cmdp = *pp; cmdp; cmdp = cmdp->next) {
3810 if (equal(cmdp->cmdname, name))
3814 if (add && cmdp == NULL) {
3816 cmdp = *pp = xmalloc(sizeof(struct tblentry) - ARB
3817 + strlen(name) + 1);
3819 cmdp->cmdtype = CMDUNKNOWN;
3821 strcpy(cmdp->cmdname, name);
3829 * Delete the command entry returned on the last lookup.
3832 static void delete_cmd_entry(void)
3834 struct tblentry *cmdp;
3837 cmdp = *lastcmdentry;
3838 *lastcmdentry = cmdp->next;
3847 static const unsigned char nodesize[26] = {
3848 ALIGN(sizeof(struct nbinary)),
3849 ALIGN(sizeof(struct ncmd)),
3850 ALIGN(sizeof(struct npipe)),
3851 ALIGN(sizeof(struct nredir)),
3852 ALIGN(sizeof(struct nredir)),
3853 ALIGN(sizeof(struct nredir)),
3854 ALIGN(sizeof(struct nbinary)),
3855 ALIGN(sizeof(struct nbinary)),
3856 ALIGN(sizeof(struct nif)),
3857 ALIGN(sizeof(struct nbinary)),
3858 ALIGN(sizeof(struct nbinary)),
3859 ALIGN(sizeof(struct nfor)),
3860 ALIGN(sizeof(struct ncase)),
3861 ALIGN(sizeof(struct nclist)),
3862 ALIGN(sizeof(struct narg)),
3863 ALIGN(sizeof(struct narg)),
3864 ALIGN(sizeof(struct nfile)),
3865 ALIGN(sizeof(struct nfile)),
3866 ALIGN(sizeof(struct nfile)),
3867 ALIGN(sizeof(struct nfile)),
3868 ALIGN(sizeof(struct nfile)),
3869 ALIGN(sizeof(struct ndup)),
3870 ALIGN(sizeof(struct ndup)),
3871 ALIGN(sizeof(struct nhere)),
3872 ALIGN(sizeof(struct nhere)),
3873 ALIGN(sizeof(struct nnot)),
3879 * Delete a function if it exists.
3882 static void unsetfunc(char *name)
3884 struct tblentry *cmdp;
3886 if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
3887 free(cmdp->param.func);
3894 * Locate and print what a word is...
3897 static int typecmd(int argc, char **argv)
3905 for (i = 1; i < argc; i++) {
3906 argv_a[0] = argv[i];
3909 err |= hashcmd(argc, argv);
3914 #ifdef CONFIG_ASH_CMDCMD
3915 static int commandcmd(int argc, char **argv)
3918 int default_path = 0;
3919 int verify_only = 0;
3920 int verbose_verify_only = 0;
3922 while ((c = nextopt("pvV")) != '\0')
3931 verbose_verify_only = 1;
3935 if (default_path + verify_only + verbose_verify_only > 1 || !*argptr) {
3936 out2str("command [-p] command [arg ...]\n"
3937 "command {-v|-V} command\n");
3941 if (verify_only || verbose_verify_only) {
3945 argv_a[0] = *argptr;
3947 optptr = verbose_verify_only ? "v" : "V"; /* reverse special */
3948 return hashcmd(argc, argv);
3955 static int path_change(const char *newval, int *bltin)
3957 const char *old, *new;
3963 firstchange = 9999; /* assume no change */
3969 if ((*old == '\0' && *new == ':')
3970 || (*old == ':' && *new == '\0'))
3972 old = new; /* ignore subsequent differences */
3976 if (*new == '%' && *bltin < 0 && prefix("builtin", new + 1))
3983 if (builtinloc >= 0 && *bltin < 0)
3989 * Routines to expand arguments to commands. We have to deal with
3990 * backquotes, shell variables, and file metacharacters.
3995 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
3996 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
3999 * Structure specifying which parts of the string should be searched
4000 * for IFS characters.
4004 struct ifsregion *next; /* next region in list */
4005 int begoff; /* offset of start of region */
4006 int endoff; /* offset of end of region */
4007 int nulonly; /* search for nul bytes only */
4011 static char *expdest; /* output of current string */
4012 static struct nodelist *argbackq; /* list of back quote expressions */
4013 static struct ifsregion ifsfirst; /* first struct in list of ifs regions */
4014 static struct ifsregion *ifslastp; /* last struct in list */
4015 static struct arglist exparg; /* holds expanded arg list */
4017 static void argstr(char *, int);
4018 static char *exptilde(char *, int);
4019 static void expbackq(union node *, int, int);
4020 static int subevalvar(char *, char *, int, int, int, int, int);
4021 static int varisset(char *, int);
4022 static void strtodest(const char *, int, int);
4023 static void varvalue(char *, int, int);
4024 static void recordregion(int, int, int);
4025 static void removerecordregions(int);
4026 static void ifsbreakup(char *, struct arglist *);
4027 static void ifsfree(void);
4028 static void expandmeta(struct strlist *, int);
4030 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
4031 #define preglob(p) _rmescapes((p), RMESCAPE_ALLOC | RMESCAPE_GLOB)
4032 #if !defined(GLOB_BROKEN)
4033 static void addglob(const glob_t *);
4036 #if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
4037 static void expmeta(char *, char *);
4039 #if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
4040 static struct strlist *expsort(struct strlist *);
4041 static struct strlist *msort(struct strlist *, int);
4043 static int patmatch(char *, char *, int);
4045 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
4046 static int patmatch2(char *, char *, int);
4048 static int pmatch(char *, char *, int);
4050 #define patmatch2 patmatch
4052 static char *cvtnum(int, char *);
4055 * Expand shell variables and backquotes inside a here document.
4058 /* arg: the document, fd: where to write the expanded version */
4059 static inline void expandhere(union node *arg, int fd)
4062 expandarg(arg, (struct arglist *) NULL, 0);
4063 xwrite(fd, stackblock(), expdest - stackblock());
4068 * Perform variable substitution and command substitution on an argument,
4069 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
4070 * perform splitting and file name expansion. When arglist is NULL, perform
4071 * here document expansion.
4074 static void expandarg(union node *arg, struct arglist *arglist, int flag)
4079 argbackq = arg->narg.backquote;
4080 STARTSTACKSTR(expdest);
4081 ifsfirst.next = NULL;
4083 argstr(arg->narg.text, flag);
4084 if (arglist == NULL) {
4085 return; /* here document expanded */
4087 STPUTC('\0', expdest);
4088 p = grabstackstr(expdest);
4089 exparg.lastp = &exparg.list;
4093 if (flag & EXP_FULL) {
4094 ifsbreakup(p, &exparg);
4095 *exparg.lastp = NULL;
4096 exparg.lastp = &exparg.list;
4097 expandmeta(exparg.list, flag);
4099 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
4101 sp = (struct strlist *) stalloc(sizeof(struct strlist));
4104 exparg.lastp = &sp->next;
4107 *exparg.lastp = NULL;
4109 *arglist->lastp = exparg.list;
4110 arglist->lastp = exparg.lastp;
4116 * Expand a variable, and return a pointer to the next character in the
4120 static inline char *evalvar(char *p, int flag)
4133 int quotes = flag & (EXP_FULL | EXP_CASE);
4136 subtype = varflags & VSTYPE;
4141 p = strchr(p, '=') + 1;
4142 again: /* jump here after setting a variable with ${var=text} */
4144 set = varisset(var, varflags & VSNUL);
4147 val = lookupvar(var);
4148 if (val == NULL || ((varflags & VSNUL) && val[0] == '\0')) {
4155 startloc = expdest - stackblock();
4156 if (set && subtype != VSPLUS) {
4157 /* insert the value of the variable */
4159 varvalue(var, varflags & VSQUOTE, flag);
4160 if (subtype == VSLENGTH) {
4161 varlen = expdest - stackblock() - startloc;
4162 STADJUST(-varlen, expdest);
4165 if (subtype == VSLENGTH) {
4166 varlen = strlen(val);
4169 varflags & VSQUOTE ? DQSYNTAX : BASESYNTAX, quotes);
4174 if (subtype == VSPLUS)
4177 easy = ((varflags & VSQUOTE) == 0 ||
4178 (*var == '@' && shellparam.nparam != 1));
4183 expdest = cvtnum(varlen, expdest);
4190 recordregion(startloc, expdest - stackblock(), varflags & VSQUOTE);
4206 case VSTRIMRIGHTMAX:
4210 * Terminate the string and start recording the pattern
4213 STPUTC('\0', expdest);
4214 patloc = expdest - stackblock();
4215 if (subevalvar(p, NULL, patloc, subtype,
4216 startloc, varflags, quotes) == 0) {
4217 int amount = (expdest - stackblock() - patloc) + 1;
4219 STADJUST(-amount, expdest);
4221 /* Remove any recorded regions beyond start of variable */
4222 removerecordregions(startloc);
4228 if (subevalvar(p, var, 0, subtype, startloc, varflags, quotes)) {
4231 * Remove any recorded regions beyond
4234 removerecordregions(startloc);
4249 if (subtype != VSNORMAL) { /* skip to end of alternative */
4253 if ((c = *p++) == CTLESC)
4255 else if (c == CTLBACKQ || c == (CTLBACKQ | CTLQUOTE)) {
4257 argbackq = argbackq->next;
4258 } else if (c == CTLVAR) {
4259 if ((*p++ & VSTYPE) != VSNORMAL)
4261 } else if (c == CTLENDVAR) {
4272 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
4273 * characters to allow for further processing. Otherwise treat
4274 * $@ like $* since no splitting will be performed.
4277 static void argstr(char *p, int flag)
4280 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
4283 if (*p == '~' && (flag & (EXP_TILDE | EXP_VARTILDE)))
4284 p = exptilde(p, flag);
4288 case CTLENDVAR: /* ??? */
4291 /* "$@" syntax adherence hack */
4292 if (p[0] == CTLVAR && p[2] == '@' && p[3] == '=')
4294 if ((flag & EXP_FULL) != 0)
4304 p = evalvar(p, flag);
4307 case CTLBACKQ | CTLQUOTE:
4308 expbackq(argbackq->n, c & CTLQUOTE, flag);
4309 argbackq = argbackq->next;
4311 #ifdef CONFIG_ASH_MATH_SUPPORT
4319 * sort of a hack - expand tildes in variable
4320 * assignments (after the first '=' and after ':'s).
4323 if (flag & EXP_VARTILDE && *p == '~') {
4330 p = exptilde(p, flag);
4339 static char *exptilde(char *p, int flag)
4341 char c, *startp = p;
4344 int quotes = flag & (EXP_FULL | EXP_CASE);
4346 while ((c = *p) != '\0') {
4353 if (flag & EXP_VARTILDE)
4363 if (*(startp + 1) == '\0') {
4364 if ((home = lookupvar("HOME")) == NULL)
4367 if ((pw = getpwnam(startp + 1)) == NULL)
4374 strtodest(home, SQSYNTAX, quotes);
4382 static void removerecordregions(int endoff)
4384 if (ifslastp == NULL)
4387 if (ifsfirst.endoff > endoff) {
4388 while (ifsfirst.next != NULL) {
4389 struct ifsregion *ifsp;
4392 ifsp = ifsfirst.next->next;
4393 free(ifsfirst.next);
4394 ifsfirst.next = ifsp;
4397 if (ifsfirst.begoff > endoff)
4400 ifslastp = &ifsfirst;
4401 ifsfirst.endoff = endoff;
4406 ifslastp = &ifsfirst;
4407 while (ifslastp->next && ifslastp->next->begoff < endoff)
4408 ifslastp = ifslastp->next;
4409 while (ifslastp->next != NULL) {
4410 struct ifsregion *ifsp;
4413 ifsp = ifslastp->next->next;
4414 free(ifslastp->next);
4415 ifslastp->next = ifsp;
4418 if (ifslastp->endoff > endoff)
4419 ifslastp->endoff = endoff;
4423 #ifdef CONFIG_ASH_MATH_SUPPORT
4425 * Expand arithmetic expression. Backup to start of expression,
4426 * evaluate, place result in (backed up) result, adjust string position.
4428 static void expari(int flag)
4434 int quotes = flag & (EXP_FULL | EXP_CASE);
4440 * This routine is slightly over-complicated for
4441 * efficiency. First we make sure there is
4442 * enough space for the result, which may be bigger
4443 * than the expression if we add exponentation. Next we
4444 * scan backwards looking for the start of arithmetic. If the
4445 * next previous character is a CTLESC character, then we
4446 * have to rescan starting from the beginning since CTLESC
4447 * characters have to be processed left to right.
4449 CHECKSTRSPACE(10, expdest);
4450 USTPUTC('\0', expdest);
4451 start = stackblock();
4453 while (*p != CTLARI && p >= start)
4456 error("missing CTLARI (shouldn't happen)");
4457 if (p > start && *(p - 1) == CTLESC)
4458 for (p = start; *p != CTLARI; p++)
4467 removerecordregions(begoff);
4470 result = arith(p + 2, &errcode);
4473 error("divide by zero");
4475 error("syntax error: \"%s\"\n", p + 2);
4477 snprintf(p, 12, "%d", result);
4481 recordregion(begoff, p - 1 - start, 0);
4482 result = expdest - p + 1;
4483 STADJUST(-result, expdest);
4488 * Expand stuff in backwards quotes.
4491 static void expbackq(union node *cmd, int quoted, int flag)
4493 volatile struct backcmd in;
4497 char *dest = expdest;
4498 volatile struct ifsregion saveifs;
4499 struct ifsregion *volatile savelastp;
4500 struct nodelist *volatile saveargbackq;
4502 int startloc = dest - stackblock();
4503 int syntax = quoted ? DQSYNTAX : BASESYNTAX;
4504 volatile int saveherefd;
4505 int quotes = flag & (EXP_FULL | EXP_CASE);
4506 struct jmploc jmploc;
4507 struct jmploc *volatile savehandler;
4511 /* Avoid longjmp clobbering */
4522 savelastp = ifslastp;
4523 saveargbackq = argbackq;
4524 saveherefd = herefd;
4526 if ((ex = setjmp(jmploc.loc))) {
4529 savehandler = handler;
4532 p = grabstackstr(dest);
4533 evalbackcmd(cmd, (struct backcmd *) &in);
4534 ungrabstackstr(p, dest);
4538 ifslastp = savelastp;
4539 argbackq = saveargbackq;
4540 herefd = saveherefd;
4548 if (--in.nleft < 0) {
4551 i = safe_read(in.fd, buf, sizeof buf);
4552 TRACE(("expbackq: read returns %d\n", i));
4559 if (lastc != '\0') {
4560 if (quotes && SIT(lastc, syntax) == CCTL)
4561 STPUTC(CTLESC, dest);
4562 STPUTC(lastc, dest);
4566 /* Eat all trailing newlines */
4567 for (; dest > stackblock() && dest[-1] == '\n';)
4575 exitstatus = waitforjob(in.jp);
4576 handler = savehandler;
4578 longjmp(handler->loc, 1);
4581 recordregion(startloc, dest - stackblock(), 0);
4582 TRACE(("evalbackq: size=%d: \"%.*s\"\n",
4583 (dest - stackblock()) - startloc,
4584 (dest - stackblock()) - startloc, stackblock() + startloc));
4590 subevalvar(char *p, char *str, int strloc, int subtype, int startloc,
4591 int varflags, int quotes)
4597 int saveherefd = herefd;
4598 struct nodelist *saveargbackq = argbackq;
4602 argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0);
4603 STACKSTRNUL(expdest);
4604 herefd = saveherefd;
4605 argbackq = saveargbackq;
4606 startp = stackblock() + startloc;
4608 str = stackblock() + strloc;
4612 setvar(str, startp, 0);
4613 amount = startp - expdest;
4614 STADJUST(amount, expdest);
4621 if (*p != CTLENDVAR) {
4622 out2fmt(snlfmt, startp);
4623 error((char *) NULL);
4625 error("%.*s: parameter %snot set", p - str - 1,
4626 str, (varflags & VSNUL) ? "null or " : nullstr);
4630 for (loc = startp; loc < str; loc++) {
4633 if (patmatch2(str, startp, quotes))
4636 if (quotes && *loc == CTLESC)
4642 for (loc = str - 1; loc >= startp;) {
4645 if (patmatch2(str, startp, quotes))
4649 if (quotes && loc > startp && *(loc - 1) == CTLESC) {
4650 for (q = startp; q < loc; q++)
4660 for (loc = str - 1; loc >= startp;) {
4661 if (patmatch2(str, loc, quotes))
4664 if (quotes && loc > startp && *(loc - 1) == CTLESC) {
4665 for (q = startp; q < loc; q++)
4674 case VSTRIMRIGHTMAX:
4675 for (loc = startp; loc < str - 1; loc++) {
4676 if (patmatch2(str, loc, quotes))
4678 if (quotes && *loc == CTLESC)
4691 amount = ((str - 1) - (loc - startp)) - expdest;
4692 STADJUST(amount, expdest);
4693 while (loc != str - 1)
4698 amount = loc - expdest;
4699 STADJUST(amount, expdest);
4700 STPUTC('\0', expdest);
4701 STADJUST(-1, expdest);
4707 * Test whether a specialized variable is set.
4710 static int varisset(char *name, int nulok)
4713 return backgndpid != -1;
4714 else if (*name == '@' || *name == '*') {
4715 if (*shellparam.p == NULL)
4721 for (av = shellparam.p; *av; av++)
4726 } else if (is_digit(*name)) {
4728 int num = atoi(name);
4730 if (num > shellparam.nparam)
4736 ap = shellparam.p[num - 1];
4738 if (nulok && (ap == NULL || *ap == '\0'))
4745 * Put a string on the stack.
4748 static void strtodest(const char *p, int syntax, int quotes)
4751 if (quotes && SIT(*p, syntax) == CCTL)
4752 STPUTC(CTLESC, expdest);
4753 STPUTC(*p++, expdest);
4758 * Add the value of a specialized variable to the stack string.
4761 static void varvalue(char *name, int quoted, int flags)
4770 int allow_split = flags & EXP_FULL;
4771 int quotes = flags & (EXP_FULL | EXP_CASE);
4773 syntax = quoted ? DQSYNTAX : BASESYNTAX;
4782 num = shellparam.nparam;
4787 expdest = cvtnum(num, expdest);
4790 for (i = 0; i < NOPTS; i++) {
4792 STPUTC(optent_letter(optlist[i]), expdest);
4796 if (allow_split && quoted) {
4797 sep = 1 << CHAR_BIT;
4802 sep = ifsset()? ifsval()[0] : ' ';
4804 sepq = SIT(sep, syntax) == CCTL;
4807 for (ap = shellparam.p; (p = *ap++) != NULL;) {
4808 strtodest(p, syntax, quotes);
4811 STPUTC(CTLESC, expdest);
4812 STPUTC(sep, expdest);
4817 strtodest(arg0, syntax, quotes);
4821 if (num > 0 && num <= shellparam.nparam) {
4822 strtodest(shellparam.p[num - 1], syntax, quotes);
4830 * Record the fact that we have to scan this region of the
4831 * string for IFS characters.
4834 static void recordregion(int start, int end, int nulonly)
4836 struct ifsregion *ifsp;
4838 if (ifslastp == NULL) {
4842 ifsp = (struct ifsregion *) xmalloc(sizeof(struct ifsregion));
4844 ifslastp->next = ifsp;
4848 ifslastp->begoff = start;
4849 ifslastp->endoff = end;
4850 ifslastp->nulonly = nulonly;
4856 * Break the argument string into pieces based upon IFS and add the
4857 * strings to the argument list. The regions of the string to be
4858 * searched for IFS characters have been stored by recordregion.
4860 static void ifsbreakup(char *string, struct arglist *arglist)
4862 struct ifsregion *ifsp;
4867 const char *ifs, *realifs;
4875 realifs = ifsset()? ifsval() : defifs;
4876 if (ifslastp != NULL) {
4879 p = string + ifsp->begoff;
4880 nulonly = ifsp->nulonly;
4881 ifs = nulonly ? nullstr : realifs;
4883 while (p < string + ifsp->endoff) {
4887 if (strchr(ifs, *p)) {
4889 ifsspc = (strchr(defifs, *p) != NULL);
4890 /* Ignore IFS whitespace at start */
4891 if (q == start && ifsspc) {
4897 sp = (struct strlist *) stalloc(sizeof *sp);
4899 *arglist->lastp = sp;
4900 arglist->lastp = &sp->next;
4904 if (p >= string + ifsp->endoff) {
4910 if (strchr(ifs, *p) == NULL) {
4913 } else if (strchr(defifs, *p) == NULL) {
4929 } while ((ifsp = ifsp->next) != NULL);
4930 if (!(*start || (!ifsspc && start > string && nulonly))) {
4935 sp = (struct strlist *) stalloc(sizeof *sp);
4937 *arglist->lastp = sp;
4938 arglist->lastp = &sp->next;
4941 static void ifsfree(void)
4943 while (ifsfirst.next != NULL) {
4944 struct ifsregion *ifsp;
4947 ifsp = ifsfirst.next->next;
4948 free(ifsfirst.next);
4949 ifsfirst.next = ifsp;
4953 ifsfirst.next = NULL;
4957 * Add a file name to the list.
4960 static void addfname(const char *name)
4963 size_t len = strlen(name) + 1;
4965 sp = (struct strlist *) stalloc(sizeof *sp);
4966 sp->text = memcpy(stalloc(len), name, len);
4968 exparg.lastp = &sp->next;
4972 * Expand shell metacharacters. At this point, the only control characters
4973 * should be escapes. The results are stored in the list exparg.
4976 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN)
4977 static void expandmeta(struct strlist *str, int flag)
4982 /* TODO - EXP_REDIR */
4987 p = preglob(str->text);
4989 switch (glob(p, 0, 0, &pglob)) {
4991 if (pglob.gl_pathv[1] == 0 && !strcmp(p, pglob.gl_pathv[0]))
5002 *exparg.lastp = str;
5003 rmescapes(str->text);
5004 exparg.lastp = &str->next;
5006 default: /* GLOB_NOSPACE */
5007 error("Out of space");
5015 * Add the result of glob(3) to the list.
5018 static void addglob(const glob_t * pglob)
5020 char **p = pglob->gl_pathv;
5028 #else /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
5029 static char *expdir;
5032 static void expandmeta(struct strlist *str, int flag)
5035 struct strlist **savelastp;
5039 /* TODO - EXP_REDIR */
5045 for (;;) { /* fast check for meta chars */
5046 if ((c = *p++) == '\0')
5048 if (c == '*' || c == '?' || c == '[' || c == '!')
5051 savelastp = exparg.lastp;
5053 if (expdir == NULL) {
5054 int i = strlen(str->text);
5056 expdir = xmalloc(i < 2048 ? 2048 : i); /* XXX */
5059 expmeta(expdir, str->text);
5063 if (exparg.lastp == savelastp) {
5068 *exparg.lastp = str;
5069 rmescapes(str->text);
5070 exparg.lastp = &str->next;
5072 *exparg.lastp = NULL;
5073 *savelastp = sp = expsort(*savelastp);
5074 while (sp->next != NULL)
5076 exparg.lastp = &sp->next;
5084 * Do metacharacter (i.e. *, ?, [...]) expansion.
5087 static void expmeta(char *enddir, char *name)
5103 for (p = name;; p++) {
5104 if (*p == '*' || *p == '?')
5106 else if (*p == '[') {
5111 while (*q == CTLQUOTEMARK)
5115 if (*q == '/' || *q == '\0')
5122 } else if (*p == '!' && p[1] == '!' && (p == name || p[-1] == '/')) {
5124 } else if (*p == '\0')
5126 else if (*p == CTLQUOTEMARK)
5128 else if (*p == CTLESC)
5136 if (metaflag == 0) { /* we've reached the end of the file name */
5137 if (enddir != expdir)
5139 for (p = name;; p++) {
5140 if (*p == CTLQUOTEMARK)
5148 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
5153 if (start != name) {
5156 while (*p == CTLQUOTEMARK)
5163 if (enddir == expdir) {
5165 } else if (enddir == expdir + 1 && *expdir == '/') {
5171 if ((dirp = opendir(cp)) == NULL)
5173 if (enddir != expdir)
5175 if (*endname == 0) {
5183 while (*p == CTLQUOTEMARK)
5189 while (!int_pending() && (dp = readdir(dirp)) != NULL) {
5190 if (dp->d_name[0] == '.' && !matchdot)
5192 if (patmatch(start, dp->d_name, 0)) {
5194 strcpy(enddir, dp->d_name);
5197 for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';)
5200 expmeta(p, endname);
5208 #endif /* defined(__GLIBC__) && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN) */
5212 #if !(defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN) && !defined(GLOB_BROKEN))
5214 * Sort the results of file name expansion. It calculates the number of
5215 * strings to sort and then calls msort (short for merge sort) to do the
5219 static struct strlist *expsort(struct strlist *str)
5225 for (sp = str; sp; sp = sp->next)
5227 return msort(str, len);
5231 static struct strlist *msort(struct strlist *list, int len)
5233 struct strlist *p, *q = NULL;
5234 struct strlist **lpp;
5242 for (n = half; --n >= 0;) {
5246 q->next = NULL; /* terminate first half of list */
5247 q = msort(list, half); /* sort first half of list */
5248 p = msort(p, len - half); /* sort second half */
5251 if (strcmp(p->text, q->text) < 0) {
5254 if ((p = *lpp) == NULL) {
5261 if ((q = *lpp) == NULL) {
5274 * Returns true if the pattern matches the string.
5277 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
5278 /* squoted: string might have quote chars */
5279 static int patmatch(char *pattern, char *string, int squoted)
5284 p = preglob(pattern);
5285 q = squoted ? _rmescapes(string, RMESCAPE_ALLOC) : string;
5287 return !fnmatch(p, q, 0);
5291 static int patmatch2(char *pattern, char *string, int squoted)
5297 p = grabstackstr(expdest);
5298 res = patmatch(pattern, string, squoted);
5299 ungrabstackstr(p, expdest);
5303 static int patmatch(char *pattern, char *string, int squoted)
5305 return pmatch(pattern, string, squoted);
5309 static int pmatch(char *pattern, char *string, int squoted)
5321 if (squoted && *q == CTLESC)
5329 if (squoted && *q == CTLESC)
5336 while (c == CTLQUOTEMARK || c == '*')
5338 if (c != CTLESC && c != CTLQUOTEMARK &&
5339 c != '?' && c != '*' && c != '[') {
5341 if (squoted && *q == CTLESC && q[1] == c)
5345 if (squoted && *q == CTLESC)
5351 if (pmatch(p, q, squoted))
5353 if (squoted && *q == CTLESC)
5355 } while (*q++ != '\0');
5366 while (*endp == CTLQUOTEMARK)
5369 goto dft; /* no matching ] */
5370 if (*endp == CTLESC)
5382 if (squoted && chr == CTLESC)
5388 if (c == CTLQUOTEMARK)
5392 if (*p == '-' && p[1] != ']') {
5394 while (*p == CTLQUOTEMARK)
5398 if (chr >= c && chr <= *p)
5405 } while ((c = *p++) != ']');
5406 if (found == invert)
5411 if (squoted && *q == CTLESC)
5428 * Remove any CTLESC characters from a string.
5431 #if defined(__GLIBC__) && __GLIBC__ >= 2 && !defined(FNMATCH_BROKEN)
5432 static char *_rmescapes(char *str, int flag)
5435 static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 };
5437 p = strpbrk(str, qchars);
5443 if (flag & RMESCAPE_ALLOC) {
5444 size_t len = p - str;
5446 q = r = stalloc(strlen(p) + len + 1);
5448 memcpy(q, str, len);
5453 if (*p == CTLQUOTEMARK) {
5459 if (flag & RMESCAPE_GLOB && *p != '/') {
5469 static void rmescapes(char *str)
5474 while (*p != CTLESC && *p != CTLQUOTEMARK) {
5480 if (*p == CTLQUOTEMARK) {
5495 * See if a pattern matches in a case statement.
5498 static int casematch(union node *pattern, const char *val)
5500 struct stackmark smark;
5504 setstackmark(&smark);
5505 argbackq = pattern->narg.backquote;
5506 STARTSTACKSTR(expdest);
5508 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
5509 STPUTC('\0', expdest);
5510 p = grabstackstr(expdest);
5511 result = patmatch(p, (char *) val, 0);
5512 popstackmark(&smark);
5520 static char *cvtnum(int num, char *buf)
5524 CHECKSTRSPACE(32, buf);
5525 len = sprintf(buf, "%d", num);
5531 * Editline and history functions (and glue).
5533 static int histcmd(int argc, char **argv)
5535 error("not compiled with history support");
5541 struct redirtab *next;
5542 short renamed[10]; /* Current ash support only 0-9 descriptors */
5543 /* char on arm (and others) can't be negative */
5546 static struct redirtab *redirlist;
5548 extern char **environ;
5553 * Initialization code.
5556 static void init(void)
5567 basepf.nextc = basepf.buf = basebuf;
5576 for (envp = environ; *envp; envp++) {
5577 if (strchr(*envp, '=')) {
5578 setvareq(*envp, VEXPORT | VTEXTFIXED);
5582 snprintf(ppid, sizeof(ppid), "%d", (int) getppid());
5583 setvar("PPID", ppid, 0);
5590 * This routine is called when an error or an interrupt occurs in an
5591 * interactive shell and control is returned to the main command loop.
5594 /* 1 == check for aliases, 2 == also check for assignments */
5595 static int checkalias; /* also used in no alias mode for check assignments */
5597 static void reset(void)
5609 parselleft = parsenleft = 0; /* clear input buffer */
5613 /* from parser.c: */
5631 * This file implements the input routines used by the parser.
5634 #ifdef CONFIG_FEATURE_COMMAND_EDITING
5635 static const char *cmdedit_prompt;
5636 static inline void putprompt(const char *s)
5641 static inline void putprompt(const char *s)
5647 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
5652 * Same as pgetc(), but ignores PEOA.
5655 #ifdef CONFIG_ASH_ALIAS
5656 static int pgetc2(void)
5662 } while (c == PEOA);
5666 static inline int pgetc2(void)
5668 return pgetc_macro();
5673 * Read a line from the script.
5676 static inline char *pfgets(char *line, int len)
5682 while (--nleft > 0) {
5697 static inline int preadfd(void)
5700 char *buf = parsefile->buf;
5705 #ifdef CONFIG_FEATURE_COMMAND_EDITING
5707 if (!iflag || parsefile->fd)
5708 nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
5710 nr = cmdedit_read_input((char *) cmdedit_prompt, buf);
5714 nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
5718 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
5719 int flags = fcntl(0, F_GETFL, 0);
5721 if (flags >= 0 && flags & O_NONBLOCK) {
5722 flags &= ~O_NONBLOCK;
5723 if (fcntl(0, F_SETFL, flags) >= 0) {
5724 out2str("sh: turning off NDELAY mode\n");
5733 static void popstring(void)
5735 struct strpush *sp = parsefile->strpush;
5738 #ifdef CONFIG_ASH_ALIAS
5740 if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
5745 if (sp->string != sp->ap->val) {
5749 sp->ap->flag &= ~ALIASINUSE;
5750 if (sp->ap->flag & ALIASDEAD) {
5751 unalias(sp->ap->name);
5755 parsenextc = sp->prevstring;
5756 parsenleft = sp->prevnleft;
5757 /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
5758 parsefile->strpush = sp->prev;
5759 if (sp != &(parsefile->basestrpush))
5766 * Refill the input buffer and return the next input character:
5768 * 1) If a string was pushed back on the input, pop it;
5769 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
5770 * from a string so we can't refill the buffer, return EOF.
5771 * 3) If the is more stuff in this buffer, use it else call read to fill it.
5772 * 4) Process input up to the next newline, deleting nul characters.
5775 static int preadbuffer(void)
5781 while (parsefile->strpush) {
5782 #ifdef CONFIG_ASH_ALIAS
5783 if (parsenleft == -1 && parsefile->strpush->ap &&
5784 parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
5789 if (--parsenleft >= 0)
5790 return (*parsenextc++);
5792 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
5797 if (parselleft <= 0) {
5798 if ((parselleft = preadfd()) <= 0) {
5799 parselleft = parsenleft = EOF_NLEFT;
5806 /* delete nul characters */
5807 for (more = 1; more;) {
5815 parsenleft = q - parsenextc;
5816 more = 0; /* Stop processing here */
5822 if (--parselleft <= 0 && more) {
5823 parsenleft = q - parsenextc - 1;
5834 out2str(parsenextc);
5839 return *parsenextc++;
5844 * Push a string back onto the input at this current parsefile level.
5845 * We handle aliases this way.
5847 static void pushstring(char *s, int len, void *ap)
5852 /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
5853 if (parsefile->strpush) {
5854 sp = xmalloc(sizeof(struct strpush));
5855 sp->prev = parsefile->strpush;
5856 parsefile->strpush = sp;
5858 sp = parsefile->strpush = &(parsefile->basestrpush);
5859 sp->prevstring = parsenextc;
5860 sp->prevnleft = parsenleft;
5861 #ifdef CONFIG_ASH_ALIAS
5862 sp->ap = (struct alias *) ap;
5864 ((struct alias *) ap)->flag |= ALIASINUSE;
5875 * Like setinputfile, but takes input from a string.
5878 static void setinputstring(char *string)
5882 parsenextc = string;
5883 parsenleft = strlen(string);
5884 parsefile->buf = NULL;
5892 * To handle the "." command, a stack of input files is used. Pushfile
5893 * adds a new entry to the stack and popfile restores the previous level.
5896 static void pushfile(void)
5898 struct parsefile *pf;
5900 parsefile->nleft = parsenleft;
5901 parsefile->lleft = parselleft;
5902 parsefile->nextc = parsenextc;
5903 parsefile->linno = plinno;
5904 pf = (struct parsefile *) xmalloc(sizeof(struct parsefile));
5905 pf->prev = parsefile;
5908 pf->basestrpush.prev = NULL;
5912 #ifdef CONFIG_ASH_JOB_CONTROL
5913 static void restartjob(struct job *);
5915 static void freejob(struct job *);
5916 static struct job *getjob(const char *);
5917 static int dowait(int, struct job *);
5921 * We keep track of whether or not fd0 has been redirected. This is for
5922 * background commands, where we want to redirect fd0 to /dev/null only
5923 * if it hasn't already been redirected.
5925 static int fd0_redirected = 0;
5927 /* Return true if fd 0 has already been redirected at least once. */
5928 static inline int fd0_redirected_p(void)
5930 return fd0_redirected != 0;
5933 static void dupredirect(const union node *, int, int fd1dup);
5935 #ifdef CONFIG_ASH_JOB_CONTROL
5937 * Turn job control on and off.
5939 * Note: This code assumes that the third arg to ioctl is a character
5940 * pointer, which is true on Berkeley systems but not System V. Since
5941 * System V doesn't have job control yet, this isn't a problem now.
5946 static void setjobctl(int enable)
5948 if (enable == jobctl || rootshell == 0)
5951 do { /* while we are in the background */
5952 initialpgrp = tcgetpgrp(2);
5953 if (initialpgrp < 0) {
5954 out2str("sh: can't access tty; job control turned off\n");
5958 if (initialpgrp == -1)
5959 initialpgrp = getpgrp();
5960 else if (initialpgrp != getpgrp()) {
5961 killpg(initialpgrp, SIGTTIN);
5968 setpgid(0, rootpid);
5969 tcsetpgrp(2, rootpid);
5970 } else { /* turning job control off */
5971 setpgid(0, initialpgrp);
5972 tcsetpgrp(2, initialpgrp);
5982 #ifdef CONFIG_ASH_JOB_CONTROL
5983 static int killcmd(int argc, char **argv)
5994 ("Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n"
5995 "kill -l [exitstatus]");
5998 if (*argv[1] == '-') {
5999 signo = decode_signal(argv[1] + 1, 1);
6003 while ((c = nextopt("ls:")) != '\0')
6009 signo = decode_signal(optionarg, 1);
6011 error("invalid signal number or name: %s", optionarg);
6016 error("nextopt returned character code 0%o", c);
6023 if (!list && signo < 0)
6026 if ((signo < 0 || !*argptr) ^ list) {
6035 for (i = 1; i < NSIG; i++) {
6036 name = u_signal_names(0, &i, 1);
6042 name = u_signal_names(*argptr, &signo, -1);
6046 error("invalid signal number or exit status: %s", *argptr);
6051 if (**argptr == '%') {
6052 jp = getjob(*argptr);
6053 if (jp->jobctl == 0)
6054 error("job %s not created under job control", *argptr);
6055 pid = -jp->ps[0].pid;
6057 pid = atoi(*argptr);
6058 if (kill(pid, signo) != 0)
6059 error("%s: %m", *argptr);
6060 } while (*++argptr);
6065 static int fgcmd(int argc, char **argv)
6071 jp = getjob(argv[1]);
6072 if (jp->jobctl == 0)
6073 error("job not created under job control");
6074 pgrp = jp->ps[0].pid;
6075 ioctl(2, TIOCSPGRP, (char *) &pgrp);
6077 status = waitforjob(jp);
6082 static int bgcmd(int argc, char **argv)
6087 jp = getjob(*++argv);
6088 if (jp->jobctl == 0)
6089 error("job not created under job control");
6091 } while (--argc > 1);
6096 static void restartjob(struct job *jp)
6098 struct procstat *ps;
6101 if (jp->state == JOBDONE)
6104 killpg(jp->ps[0].pid, SIGCONT);
6105 for (ps = jp->ps, i = jp->nprocs; --i >= 0; ps++) {
6106 if (WIFSTOPPED(ps->status)) {
6115 static void showjobs(int change);
6118 static int jobscmd(int argc, char **argv)
6126 * Print a list of jobs. If "change" is nonzero, only print jobs whose
6127 * statuses have changed since the last call to showjobs.
6129 * If the shell is interrupted in the process of creating a job, the
6130 * result may be a job structure containing zero processes. Such structures
6131 * will be freed here.
6134 static void showjobs(int change)
6140 struct procstat *ps;
6144 TRACE(("showjobs(%d) called\n", change));
6145 while (dowait(0, (struct job *) NULL) > 0);
6146 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
6149 if (jp->nprocs == 0) {
6153 if (change && !jp->changed)
6155 procno = jp->nprocs;
6156 for (ps = jp->ps;; ps++) { /* for each process */
6158 snprintf(s, 64, "[%d] %ld ", jobno, (long) ps->pid);
6160 snprintf(s, 64, " %ld ", (long) ps->pid);
6164 if (ps->status == -1) {
6165 /* don't print anything */
6166 } else if (WIFEXITED(ps->status)) {
6167 snprintf(s, 64, "Exit %d", WEXITSTATUS(ps->status));
6169 #ifdef CONFIG_ASH_JOB_CONTROL
6170 if (WIFSTOPPED(ps->status))
6171 i = WSTOPSIG(ps->status);
6172 else /* WIFSIGNALED(ps->status) */
6174 i = WTERMSIG(ps->status);
6175 if ((i & 0x7F) < NSIG && sys_siglist[i & 0x7F])
6176 strcpy(s, sys_siglist[i & 0x7F]);
6178 snprintf(s, 64, "Signal %d", i & 0x7F);
6179 if (WCOREDUMP(ps->status))
6180 strcat(s, " (core dumped)");
6184 printf("%*c%s\n", 30 - col >= 0 ? 30 - col : 0, ' ', ps->cmd);
6189 if (jp->state == JOBDONE) {
6197 * Mark a job structure as unused.
6200 static void freejob(struct job *jp)
6202 const struct procstat *ps;
6206 for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) {
6207 if (ps->cmd != nullstr)
6210 if (jp->ps != &jp->ps0)
6213 #ifdef CONFIG_ASH_JOB_CONTROL
6214 if (curjob == jp - jobtab + 1)
6222 static int waitcmd(int argc, char **argv)
6230 job = getjob(*++argv);
6234 for (;;) { /* loop until process terminated or stopped */
6237 status = job->ps[job->nprocs - 1].status;
6243 if (WIFEXITED(status))
6244 retval = WEXITSTATUS(status);
6245 #ifdef CONFIG_ASH_JOB_CONTROL
6246 else if (WIFSTOPPED(status))
6247 retval = WSTOPSIG(status) + 128;
6250 /* XXX: limits number of signals */
6251 retval = WTERMSIG(status) + 128;
6256 for (jp = jobtab;; jp++) {
6257 if (jp >= jobtab + njobs) { /* no running procs */
6260 if (jp->used && jp->state == 0)
6264 if (dowait(2, 0) < 0 && errno == EINTR) {
6273 * Convert a job name to a job structure.
6276 static struct job *getjob(const char *name)
6284 #ifdef CONFIG_ASH_JOB_CONTROL
6286 if ((jobno = curjob) == 0 || jobtab[jobno - 1].used == 0)
6287 error("No current job");
6288 return &jobtab[jobno - 1];
6290 error("No current job");
6292 } else if (name[0] == '%') {
6293 if (is_digit(name[1])) {
6294 jobno = number(name + 1);
6295 if (jobno > 0 && jobno <= njobs && jobtab[jobno - 1].used != 0)
6296 return &jobtab[jobno - 1];
6297 #ifdef CONFIG_ASH_JOB_CONTROL
6298 } else if (name[1] == '%' && name[2] == '\0') {
6302 struct job *found = NULL;
6304 for (jp = jobtab, i = njobs; --i >= 0; jp++) {
6305 if (jp->used && jp->nprocs > 0
6306 && prefix(name + 1, jp->ps[0].cmd)) {
6308 error("%s: ambiguous", name);
6315 } else if (is_number(name, &pid)) {
6316 for (jp = jobtab, i = njobs; --i >= 0; jp++) {
6317 if (jp->used && jp->nprocs > 0
6318 && jp->ps[jp->nprocs - 1].pid == pid)
6322 error("No such job: %s", name);
6329 * Return a new job structure,
6332 static struct job *makejob(const union node *node, int nprocs)
6337 for (i = njobs, jp = jobtab;; jp++) {
6341 jobtab = xmalloc(4 * sizeof jobtab[0]);
6343 jp = xmalloc((njobs + 4) * sizeof jobtab[0]);
6344 memcpy(jp, jobtab, njobs * sizeof jp[0]);
6345 /* Relocate `ps' pointers */
6346 for (i = 0; i < njobs; i++)
6347 if (jp[i].ps == &jobtab[i].ps0)
6348 jp[i].ps = &jp[i].ps0;
6352 jp = jobtab + njobs;
6353 for (i = 4; --i >= 0; jobtab[njobs++].used = 0);
6365 #ifdef CONFIG_ASH_JOB_CONTROL
6366 jp->jobctl = jobctl;
6369 jp->ps = xmalloc(nprocs * sizeof(struct procstat));
6374 TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long) node, nprocs,
6381 * Fork of a subshell. If we are doing job control, give the subshell its
6382 * own process group. Jp is a job structure that the job is to be added to.
6383 * N is the command that will be evaluated by the child. Both jp and n may
6384 * be NULL. The mode parameter can be one of the following:
6385 * FORK_FG - Fork off a foreground process.
6386 * FORK_BG - Fork off a background process.
6387 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
6388 * process group even if job control is on.
6390 * When job control is turned off, background processes have their standard
6391 * input redirected to /dev/null (except for the second and later processes
6397 static int forkshell(struct job *jp, const union node *n, int mode)
6401 #ifdef CONFIG_ASH_JOB_CONTROL
6404 const char *devnull = _PATH_DEVNULL;
6405 const char *nullerr = "Can't open %s";
6407 TRACE(("forkshell(%%%d, 0x%lx, %d) called\n", jp - jobtab, (long) n,
6410 #if !defined(__UCLIBC__) || defined(__UCLIBC_HAS_MMU__)
6416 TRACE(("Fork failed, errno=%d\n", errno));
6418 error("Cannot fork");
6425 TRACE(("Child shell %d\n", getpid()));
6426 wasroot = rootshell;
6431 #ifdef CONFIG_ASH_JOB_CONTROL
6432 jobctl = 0; /* do job control only in root shell */
6433 if (wasroot && mode != FORK_NOJOB && mflag) {
6434 if (jp == NULL || jp->nprocs == 0)
6437 pgrp = jp->ps[0].pid;
6439 if (mode == FORK_FG) {
6440 /*** this causes superfluous TIOCSPGRPS ***/
6441 if (tcsetpgrp(2, pgrp) < 0)
6442 error("tcsetpgrp failed, errno=%d", errno);
6446 } else if (mode == FORK_BG) {
6448 if (mode == FORK_BG) {
6452 if ((jp == NULL || jp->nprocs == 0) && !fd0_redirected_p()) {
6454 if (open(devnull, O_RDONLY) != 0)
6455 error(nullerr, devnull);
6458 for (i = njobs, p = jobtab; --i >= 0; p++)
6461 if (wasroot && iflag) {
6468 #ifdef CONFIG_ASH_JOB_CONTROL
6469 if (rootshell && mode != FORK_NOJOB && mflag) {
6470 if (jp == NULL || jp->nprocs == 0)
6473 pgrp = jp->ps[0].pid;
6477 if (mode == FORK_BG)
6478 backgndpid = pid; /* set $! */
6480 struct procstat *ps = &jp->ps[jp->nprocs++];
6485 if (iflag && rootshell && n)
6486 ps->cmd = commandtext(n);
6489 TRACE(("In parent shell: child = %d\n", pid));
6496 * Wait for job to finish.
6498 * Under job control we have the problem that while a child process is
6499 * running interrupts generated by the user are sent to the child but not
6500 * to the shell. This means that an infinite loop started by an inter-
6501 * active user may be hard to kill. With job control turned off, an
6502 * interactive user may place an interactive program inside a loop. If
6503 * the interactive program catches interrupts, the user doesn't want
6504 * these interrupts to also abort the loop. The approach we take here
6505 * is to have the shell ignore interrupt signals while waiting for a
6506 * forground process to terminate, and then send itself an interrupt
6507 * signal if the child process was terminated by an interrupt signal.
6508 * Unfortunately, some programs want to do a bit of cleanup and then
6509 * exit on interrupt; unless these processes terminate themselves by
6510 * sending a signal to themselves (instead of calling exit) they will
6511 * confuse this approach.
6514 static int waitforjob(struct job *jp)
6516 #ifdef CONFIG_ASH_JOB_CONTROL
6517 int mypgrp = getpgrp();
6523 TRACE(("waitforjob(%%%d) called\n", jp - jobtab + 1));
6524 while (jp->state == 0) {
6527 #ifdef CONFIG_ASH_JOB_CONTROL
6529 if (tcsetpgrp(2, mypgrp) < 0)
6530 error("tcsetpgrp failed, errno=%d\n", errno);
6532 if (jp->state == JOBSTOPPED)
6533 curjob = jp - jobtab + 1;
6535 status = jp->ps[jp->nprocs - 1].status;
6536 /* convert to 8 bits */
6537 if (WIFEXITED(status))
6538 st = WEXITSTATUS(status);
6539 #ifdef CONFIG_ASH_JOB_CONTROL
6540 else if (WIFSTOPPED(status))
6541 st = WSTOPSIG(status) + 128;
6544 st = WTERMSIG(status) + 128;
6545 #ifdef CONFIG_ASH_JOB_CONTROL
6548 * This is truly gross.
6549 * If we're doing job control, then we did a TIOCSPGRP which
6550 * caused us (the shell) to no longer be in the controlling
6551 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
6552 * intuit from the subprocess exit status whether a SIGINT
6553 * occured, and if so interrupt ourselves. Yuck. - mycroft
6555 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGINT)
6558 if (jp->state == JOBDONE)
6568 * Wait for a process to terminate.
6572 * Do a wait system call. If job control is compiled in, we accept
6573 * stopped processes. If block is zero, we return a value of zero
6574 * rather than blocking.
6576 * System V doesn't have a non-blocking wait system call. It does
6577 * have a SIGCLD signal that is sent to a process when one of it's
6578 * children dies. The obvious way to use SIGCLD would be to install
6579 * a handler for SIGCLD which simply bumped a counter when a SIGCLD
6580 * was received, and have waitproc bump another counter when it got
6581 * the status of a process. Waitproc would then know that a wait
6582 * system call would not block if the two counters were different.
6583 * This approach doesn't work because if a process has children that
6584 * have not been waited for, System V will send it a SIGCLD when it
6585 * installs a signal handler for SIGCLD. What this means is that when
6586 * a child exits, the shell will be sent SIGCLD signals continuously
6587 * until is runs out of stack space, unless it does a wait call before
6588 * restoring the signal handler. The code below takes advantage of
6589 * this (mis)feature by installing a signal handler for SIGCLD and
6590 * then checking to see whether it was called. If there are any
6591 * children to be waited for, it will be.
6595 static inline int waitproc(int block, int *status)
6600 #ifdef CONFIG_ASH_JOB_CONTROL
6606 return wait3(status, flags, (struct rusage *) NULL);
6609 static int dowait(int block, struct job *job)
6613 struct procstat *sp;
6615 struct job *thisjob;
6621 TRACE(("dowait(%d) called\n", block));
6623 pid = waitproc(block, &status);
6624 TRACE(("wait returns %d, status=%d\n", pid, status));
6625 } while (!(block & 2) && pid == -1 && errno == EINTR);
6630 for (jp = jobtab; jp < jobtab + njobs; jp++) {
6634 for (sp = jp->ps; sp < jp->ps + jp->nprocs; sp++) {
6637 if (sp->pid == pid) {
6638 TRACE(("Changing status of proc %d from 0x%x to 0x%x\n",
6639 pid, sp->status, status));
6640 sp->status = status;
6643 if (sp->status == -1)
6645 else if (WIFSTOPPED(sp->status))
6648 if (stopped) { /* stopped or done */
6649 int state = done ? JOBDONE : JOBSTOPPED;
6651 if (jp->state != state) {
6652 TRACE(("Job %d: changing state from %d to %d\n",
6653 jp - jobtab + 1, jp->state, state));
6655 #ifdef CONFIG_ASH_JOB_CONTROL
6656 if (done && curjob == jp - jobtab + 1)
6657 curjob = 0; /* no current job */
6664 if (!rootshell || !iflag || (job && thisjob == job)) {
6665 core = WCOREDUMP(status);
6666 #ifdef CONFIG_ASH_JOB_CONTROL
6667 if (WIFSTOPPED(status))
6668 sig = WSTOPSIG(status);
6671 if (WIFEXITED(status))
6674 sig = WTERMSIG(status);
6676 if (sig != 0 && sig != SIGINT && sig != SIGPIPE) {
6678 out2fmt("%d: ", pid);
6679 #ifdef CONFIG_ASH_JOB_CONTROL
6680 if (sig == SIGTSTP && rootshell && iflag)
6681 out2fmt("%%%ld ", (long) (job - jobtab + 1));
6683 if (sig < NSIG && sys_siglist[sig])
6684 out2str(sys_siglist[sig]);
6686 out2fmt("Signal %d", sig);
6688 out2str(" - core dumped");
6691 TRACE(("Not printing status: status=%d, sig=%d\n", status, sig));
6694 TRACE(("Not printing status, rootshell=%d, job=0x%x\n", rootshell,
6697 thisjob->changed = 1;
6706 * return 1 if there are stopped jobs, otherwise 0
6708 static int stoppedjobs(void)
6715 for (jobno = 1, jp = jobtab; jobno <= njobs; jobno++, jp++) {
6718 if (jp->state == JOBSTOPPED) {
6719 out2str("You have stopped jobs.\n");
6729 * Return a string identifying a command (to be printed by the
6733 static char *cmdnextc;
6734 static int cmdnleft;
6736 #define MAXCMDTEXT 200
6738 static void cmdputs(const char *s)
6749 while ((c = *p++) != '\0') {
6752 else if (c == CTLVAR) {
6757 } else if (c == '=' && subtype != 0) {
6758 *q++ = "}-+?="[(subtype & VSTYPE) - VSNORMAL];
6760 } else if (c == CTLENDVAR) {
6762 } else if (c == CTLBACKQ || c == CTLBACKQ + CTLQUOTE)
6763 cmdnleft++; /* ignore it */
6766 if (--cmdnleft <= 0) {
6776 #define CMDTXT_TABLE
6779 * To collect a lot of redundant code in cmdtxt() case statements, we
6780 * implement a mini language here. Each type of node struct has an
6781 * associated instruction sequence that operates on its members via
6782 * their offsets. The instruction are pack in unsigned chars with
6783 * format IIDDDDDE where the bits are
6784 * I : part of the instruction opcode, which are
6785 * 00 : member is a pointer to another node -- process it recursively
6786 * 40 : member is a pointer to a char string -- output it
6787 * 80 : output the string whose index is stored in the data field
6788 * CC : flag signaling that this case needs external processing
6789 * D : data - either the (shifted) index of a fixed string to output or
6790 * the actual offset of the member to operate on in the struct
6791 * (since we assume bit 0 is set, the offset is not shifted)
6792 * E : flag signaling end of instruction sequence
6794 * WARNING: In order to handle larger offsets for 64bit archs, this code
6795 * assumes that no offset can be an odd number and stores the
6796 * end-of-instructions flag in bit 0.
6799 #define CMDTXT_NOMORE 0x01 /* NOTE: no offset should be odd */
6800 #define CMDTXT_CHARPTR 0x40
6801 #define CMDTXT_STRING 0x80
6802 #define CMDTXT_SPECIAL 0xC0
6803 #define CMDTXT_OFFSETMASK 0x3E
6805 static const char *const cmdtxt_strings[] = {
6806 /* 0 1 2 3 4 5 6 7 */
6807 "; ", "(", ")", " && ", " || ", "if ", "; then ", "...",
6808 /* 8 9 10 11 12 13 */
6809 "while ", "; do ", "; done", "until ", "for ", " in ...",
6811 "case ", "???", "() ...", "<<..."
6814 static const char *const redir_strings[] = {
6815 ">", "<", "<>", ">>", ">|", ">&", "<&"
6818 static const unsigned char cmdtxt_ops[] = {
6819 #define CMDTXT_NSEMI 0
6820 offsetof(union node, nbinary.ch1),
6822 offsetof(union node, nbinary.ch2) | CMDTXT_NOMORE,
6823 #define CMDTXT_NCMD (CMDTXT_NSEMI + 3)
6824 #define CMDTXT_NPIPE (CMDTXT_NCMD)
6825 #define CMDTXT_NCASE (CMDTXT_NCMD)
6826 #define CMDTXT_NTO (CMDTXT_NCMD)
6827 #define CMDTXT_NFROM (CMDTXT_NCMD)
6828 #define CMDTXT_NFROMTO (CMDTXT_NCMD)
6829 #define CMDTXT_NAPPEND (CMDTXT_NCMD)
6830 #define CMDTXT_NTOOV (CMDTXT_NCMD)
6831 #define CMDTXT_NTOFD (CMDTXT_NCMD)
6832 #define CMDTXT_NFROMFD (CMDTXT_NCMD)
6834 #define CMDTXT_NREDIR (CMDTXT_NPIPE + 1)
6835 #define CMDTXT_NBACKGND (CMDTXT_NREDIR)
6836 offsetof(union node, nredir.n) | CMDTXT_NOMORE,
6837 #define CMDTXT_NSUBSHELL (CMDTXT_NBACKGND + 1)
6838 (1 * 2) | CMDTXT_STRING,
6839 offsetof(union node, nredir.n),
6840 (2 * 2) | CMDTXT_STRING | CMDTXT_NOMORE,
6841 #define CMDTXT_NAND (CMDTXT_NSUBSHELL + 3)
6842 offsetof(union node, nbinary.ch1),
6843 (3 * 2) | CMDTXT_STRING,
6844 offsetof(union node, nbinary.ch2) | CMDTXT_NOMORE,
6845 #define CMDTXT_NOR (CMDTXT_NAND + 3)
6846 offsetof(union node, nbinary.ch1),
6847 (4 * 2) | CMDTXT_STRING,
6848 offsetof(union node, nbinary.ch2) | CMDTXT_NOMORE,
6849 #define CMDTXT_NIF (CMDTXT_NOR + 3)
6850 (5 * 2) | CMDTXT_STRING,
6851 offsetof(union node, nif.test),
6852 (6 * 2) | CMDTXT_STRING,
6853 offsetof(union node, nif.ifpart),
6854 (7 * 2) | CMDTXT_STRING | CMDTXT_NOMORE,
6855 #define CMDTXT_NWHILE (CMDTXT_NIF + 5)
6856 (8 * 2) | CMDTXT_STRING,
6857 offsetof(union node, nbinary.ch1),
6858 (9 * 2) | CMDTXT_STRING,
6859 offsetof(union node, nbinary.ch2),
6860 (10 * 2) | CMDTXT_STRING | CMDTXT_NOMORE,
6861 #define CMDTXT_NUNTIL (CMDTXT_NWHILE + 5)
6862 (11 * 2) | CMDTXT_STRING,
6863 offsetof(union node, nbinary.ch1),
6864 (9 * 2) | CMDTXT_STRING,
6865 offsetof(union node, nbinary.ch2),
6866 (10 * 2) | CMDTXT_STRING | CMDTXT_NOMORE,
6867 #define CMDTXT_NFOR (CMDTXT_NUNTIL + 5)
6868 (12 * 2) | CMDTXT_STRING,
6869 offsetof(union node, nfor.var) | CMDTXT_CHARPTR,
6870 (13 * 2) | CMDTXT_STRING | CMDTXT_NOMORE,
6871 #define CMDTXT_NCLIST (CMDTXT_NFOR + 3) /* TODO: IS THIS CORRECT??? */
6872 #define CMDTXT_NNOT (CMDTXT_NCLIST) /* TODO: IS THIS CORRECT??? */
6873 (15 * 2) | CMDTXT_STRING | CMDTXT_NOMORE,
6874 #define CMDTXT_NDEFUN (CMDTXT_NCLIST + 1)
6875 offsetof(union node, narg.text) | CMDTXT_CHARPTR,
6876 (16 * 2) | CMDTXT_STRING | CMDTXT_NOMORE,
6877 #define CMDTXT_NARG (CMDTXT_NDEFUN + 2)
6878 offsetof(union node, narg.text) | CMDTXT_CHARPTR | CMDTXT_NOMORE,
6879 #define CMDTXT_NHERE (CMDTXT_NARG + 1)
6880 #define CMDTXT_NXHERE (CMDTXT_NHERE)
6881 (17 * 2) | CMDTXT_STRING | CMDTXT_NOMORE,
6884 #if CMDTXT_NXHERE != 36
6885 #error CMDTXT_NXHERE
6888 static const unsigned char cmdtxt_ops_index[26] = {
6917 static void cmdtxt(const union node *n)
6924 p = cmdtxt_ops + (int) cmdtxt_ops_index[n->type];
6925 if ((*p & CMDTXT_SPECIAL) != CMDTXT_SPECIAL) { /* normal case */
6927 if (*p & CMDTXT_STRING) { /* output fixed string */
6928 cmdputs(cmdtxt_strings
6929 [((int) (*p & CMDTXT_OFFSETMASK) >> 1)]);
6931 const char *pf = ((const char *) n)
6932 + ((int) (*p & CMDTXT_OFFSETMASK));
6934 if (*p & CMDTXT_CHARPTR) { /* output dynamic string */
6935 cmdputs(*((const char **) pf));
6936 } else { /* output field */
6937 cmdtxt(*((const union node **) pf));
6940 } while (!(*p++ & CMDTXT_NOMORE));
6941 } else if (n->type == NCMD) {
6944 for (np = n->ncmd.args; np; np = np->narg.next) {
6949 for (np = n->ncmd.redirect; np; np = np->nfile.next) {
6953 } else if (n->type == NPIPE) {
6954 struct nodelist *lp;
6956 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
6961 } else if (n->type == NCASE) {
6962 cmdputs(cmdtxt_strings[14]);
6963 cmdputs(n->ncase.expr->narg.text);
6964 cmdputs(cmdtxt_strings[13]);
6966 #if (NTO != 16) || (NFROM != 17) || (NFROMTO != 18) || (NAPPEND != 19) || (NTOOV != 20) || (NTOFD != 21) || (NFROMFD != 22)
6967 #error Assumption violated regarding range and ordering of NTO ... NFROMFD!
6972 assert((n->type >= NTO) && (n->type <= NFROMFD));
6975 p = redir_strings[n->type - NTO];
6976 if (n->nfile.fd != ('>' == *p)) {
6977 s[0] = n->nfile.fd + '0';
6982 if (n->type >= NTOFD) {
6983 s[0] = n->ndup.dupfd + '0';
6987 cmdtxt(n->nfile.fname);
6991 #else /* CMDTXT_TABLE */
6992 static void cmdtxt(const union node *n)
6995 struct nodelist *lp;
7004 cmdtxt(n->nbinary.ch1);
7006 cmdtxt(n->nbinary.ch2);
7009 cmdtxt(n->nbinary.ch1);
7011 cmdtxt(n->nbinary.ch2);
7014 cmdtxt(n->nbinary.ch1);
7016 cmdtxt(n->nbinary.ch2);
7019 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
7027 cmdtxt(n->nredir.n);
7032 cmdtxt(n->nredir.n);
7036 cmdtxt(n->nif.test);
7038 cmdtxt(n->nif.ifpart);
7047 cmdtxt(n->nbinary.ch1);
7049 cmdtxt(n->nbinary.ch2);
7054 cmdputs(n->nfor.var);
7059 cmdputs(n->ncase.expr->narg.text);
7063 cmdputs(n->narg.text);
7067 for (np = n->ncmd.args; np; np = np->narg.next) {
7072 for (np = n->ncmd.redirect; np; np = np->nfile.next) {
7078 cmdputs(n->narg.text);
7109 if (n->nfile.fd != i) {
7110 s[0] = n->nfile.fd + '0';
7115 if (n->type == NTOFD || n->type == NFROMFD) {
7116 s[0] = n->ndup.dupfd + '0';
7120 cmdtxt(n->nfile.fname);
7132 #endif /* CMDTXT_TABLE */
7134 static char *commandtext(const union node *n)
7138 cmdnextc = name = xmalloc(MAXCMDTEXT);
7139 cmdnleft = MAXCMDTEXT - 4;
7146 #ifdef CONFIG_ASH_MAIL
7149 * Routines to check for mail.
7153 #define MAXMBOXES 10
7156 static int nmboxes; /* number of mailboxes */
7157 static time_t mailtime[MAXMBOXES]; /* times of mailboxes */
7162 * Print appropriate message(s) if mail has arrived. If the argument is
7163 * nozero, then the value of MAIL has changed, so we just update the
7167 static void chkmail(int silent)
7173 struct stackmark smark;
7180 setstackmark(&smark);
7181 mpath = mpathset()? mpathval() : mailval();
7182 for (i = 0; i < nmboxes; i++) {
7183 p = padvance(&mpath, nullstr);
7188 for (q = p; *q; q++);
7193 q[-1] = '\0'; /* delete trailing '/' */
7194 if (stat(p, &statb) < 0)
7196 if (statb.st_size > mailtime[i] && !silent) {
7197 out2fmt(snlfmt, pathopt ? pathopt : "you have mail");
7199 mailtime[i] = statb.st_size;
7202 popstackmark(&smark);
7205 #endif /* CONFIG_ASH_MAIL */
7210 static short profile_buf[16384];
7214 static int isloginsh = 0;
7216 static void read_profile(const char *);
7217 static void cmdloop(int);
7218 static void options(int);
7219 static void setoption(int, int);
7220 static void procargs(int, char **);
7224 * Main routine. We initialize things, parse the arguments, execute
7225 * profiles if we're a login shell, and then call cmdloop to execute
7226 * commands. The setjmp call sets up the location to jump to when an
7227 * exception occurs. When an exception occurs the variable "state"
7228 * is used to figure out how far we had gotten.
7231 int ash_main(int argc, char **argv)
7233 struct jmploc jmploc;
7234 struct stackmark smark;
7238 BLTINCMD = find_builtin("builtin");
7239 EXECCMD = find_builtin("exec");
7240 EVALCMD = find_builtin("eval");
7242 #ifndef CONFIG_FEATURE_SH_FANCY_PROMPT
7248 monitor(4, etext, profile_buf, sizeof profile_buf, 50);
7250 #if defined(linux) || defined(__GNU__)
7251 signal(SIGCHLD, SIG_DFL);
7254 if (setjmp(jmploc.loc)) {
7257 * When a shell procedure is executed, we raise the
7258 * exception EXSHELLPROC to clean up before executing
7259 * the shell procedure.
7261 if (exception == EXSHELLPROC) {
7267 if (exception == EXEXEC) {
7268 exitstatus = exerrno;
7269 } else if (exception == EXERROR) {
7272 if (state == 0 || iflag == 0 || !rootshell)
7273 exitshell(exitstatus);
7276 if (exception == EXINT) {
7279 popstackmark(&smark);
7280 FORCEINTON; /* enable interrupts */
7283 else if (state == 2)
7285 else if (state == 3)
7293 trputs("Shell args: ");
7299 setstackmark(&smark);
7300 procargs(argc, argv);
7301 if (argv[0] && argv[0][0] == '-')
7305 read_profile("/etc/profile");
7308 read_profile(".profile");
7313 if (getuid() == geteuid() && getgid() == getegid()) {
7315 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
7317 read_profile(shinit);
7324 if (sflag == 0 || minusc) {
7325 static const char sigs[] = {
7326 SIGINT, SIGQUIT, SIGHUP,
7333 #define SIGSSIZE ((sizeof(sigs)/sizeof(sigs[0])))
7336 for (i = 0; i < SIGSSIZE; i++)
7341 evalstring(minusc, 0);
7343 if (sflag || minusc == NULL) {
7344 state4: /* XXX ??? - why isn't this before the "if" statement */
7350 exitshell(exitstatus);
7356 * Read and execute commands. "Top" is nonzero for the top level command
7357 * loop; it turns on prompting if the shell is interactive.
7360 static void cmdloop(int top)
7363 struct stackmark smark;
7367 TRACE(("cmdloop(%d) called\n", top));
7368 setstackmark(&smark);
7376 #ifdef CONFIG_ASH_MAIL
7381 n = parsecmd(inter);
7382 /* showtree(n); DEBUG */
7384 if (!top || numeof >= 50)
7386 if (!stoppedjobs()) {
7389 out2str("\nUse \"exit\" to leave shell.\n");
7392 } else if (n != NULL && nflag == 0) {
7393 job_warning = (job_warning == 2) ? 1 : 0;
7397 popstackmark(&smark);
7398 setstackmark(&smark);
7399 if (evalskip == SKIPFILE) {
7404 popstackmark(&smark);
7410 * Read /etc/profile or .profile. Return on error.
7413 static void read_profile(const char *name)
7420 if ((fd = open(name, O_RDONLY)) >= 0)
7425 /* -q turns off -x and -v just when executing init files */
7426 /* Note: Might do a little redundant work, but reduces code size. */
7441 * Read a file containing shell functions.
7444 static void readcmdfile(const char *name)
7449 if ((fd = open(name, O_RDONLY)) >= 0)
7452 error("Can't open %s", name);
7461 * Take commands from a file. To be compatable we should do a path
7462 * search for the file, which is necessary to find sub-commands.
7465 static inline char *find_dot_file(char *mybasename)
7468 const char *path = pathval();
7471 /* don't try this for absolute or relative paths */
7472 if (strchr(mybasename, '/'))
7475 while ((fullname = padvance(&path, mybasename)) != NULL) {
7476 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
7478 * Don't bother freeing here, since it will
7479 * be freed by the caller.
7483 stunalloc(fullname);
7486 /* not found in the PATH */
7487 error("%s: not found", mybasename);
7491 static int dotcmd(int argc, char **argv)
7494 volatile struct shparam saveparam;
7498 for (sp = cmdenviron; sp; sp = sp->next)
7499 setvareq(xstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
7501 if (argc >= 2) { /* That's what SVR2 does */
7503 struct stackmark smark;
7505 setstackmark(&smark);
7506 fullname = find_dot_file(argv[1]);
7509 saveparam = shellparam;
7510 shellparam.malloc = 0;
7511 shellparam.nparam = argc - 2;
7512 shellparam.p = argv + 2;
7515 setinputfile(fullname, 1);
7516 commandname = fullname;
7521 freeparam(&shellparam);
7522 shellparam = saveparam;
7525 popstackmark(&smark);
7531 static int exitcmd(int argc, char **argv)
7536 exitstatus = number(argv[1]);
7538 exitstatus = oexitstatus;
7539 exitshell(exitstatus);
7543 static pointer stalloc(int nbytes)
7547 nbytes = ALIGN(nbytes);
7548 if (nbytes > stacknleft) {
7550 struct stack_block *sp;
7553 if (blocksize < MINSIZE)
7554 blocksize = MINSIZE;
7556 sp = xmalloc(sizeof(struct stack_block) - MINSIZE + blocksize);
7558 stacknxt = sp->space;
7559 stacknleft = blocksize;
7565 stacknleft -= nbytes;
7570 static void stunalloc(pointer p)
7573 if (p == NULL) { /*DEBUG */
7574 write(2, "stunalloc\n", 10);
7578 if (!(stacknxt >= (char *) p && (char *) p >= stackp->space)) {
7581 stacknleft += stacknxt - (char *) p;
7586 static void setstackmark(struct stackmark *mark)
7588 mark->stackp = stackp;
7589 mark->stacknxt = stacknxt;
7590 mark->stacknleft = stacknleft;
7591 mark->marknext = markp;
7596 static void popstackmark(struct stackmark *mark)
7598 struct stack_block *sp;
7601 markp = mark->marknext;
7602 while (stackp != mark->stackp) {
7607 stacknxt = mark->stacknxt;
7608 stacknleft = mark->stacknleft;
7614 * When the parser reads in a string, it wants to stick the string on the
7615 * stack and only adjust the stack pointer when it knows how big the
7616 * string is. Stackblock (defined in stack.h) returns a pointer to a block
7617 * of space on top of the stack and stackblocklen returns the length of
7618 * this block. Growstackblock will grow this space by at least one byte,
7619 * possibly moving it (like realloc). Grabstackblock actually allocates the
7620 * part of the block that has been used.
7623 static void growstackblock(void)
7626 int newlen = ALIGN(stacknleft * 2 + 100);
7627 char *oldspace = stacknxt;
7628 int oldlen = stacknleft;
7629 struct stack_block *sp;
7630 struct stack_block *oldstackp;
7632 if (stacknxt == stackp->space && stackp != &stackbase) {
7637 sp = xrealloc((pointer) sp,
7638 sizeof(struct stack_block) - MINSIZE + newlen);
7641 stacknxt = sp->space;
7642 stacknleft = newlen;
7644 /* Stack marks pointing to the start of the old block
7645 * must be relocated to point to the new block
7647 struct stackmark *xmark;
7650 while (xmark != NULL && xmark->stackp == oldstackp) {
7651 xmark->stackp = stackp;
7652 xmark->stacknxt = stacknxt;
7653 xmark->stacknleft = stacknleft;
7654 xmark = xmark->marknext;
7659 p = stalloc(newlen);
7660 memcpy(p, oldspace, oldlen);
7661 stacknxt = p; /* free the space */
7662 stacknleft += newlen; /* we just allocated */
7668 static inline void grabstackblock(int len)
7678 * The following routines are somewhat easier to use that the above.
7679 * The user declares a variable of type STACKSTR, which may be declared
7680 * to be a register. The macro STARTSTACKSTR initializes things. Then
7681 * the user uses the macro STPUTC to add characters to the string. In
7682 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
7683 * grown as necessary. When the user is done, she can just leave the
7684 * string there and refer to it using stackblock(). Or she can allocate
7685 * the space for it using grabstackstr(). If it is necessary to allow
7686 * someone else to use the stack temporarily and then continue to grow
7687 * the string, the user should use grabstack to allocate the space, and
7688 * then call ungrabstr(p) to return to the previous mode of operation.
7690 * USTPUTC is like STPUTC except that it doesn't check for overflow.
7691 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
7692 * is space for at least one character.
7696 static char *growstackstr(void)
7698 int len = stackblocksize();
7700 if (herefd >= 0 && len >= 1024) {
7701 xwrite(herefd, stackblock(), len);
7702 sstrnleft = len - 1;
7703 return stackblock();
7706 sstrnleft = stackblocksize() - len - 1;
7707 return stackblock() + len;
7712 * Called from CHECKSTRSPACE.
7715 static char *makestrspace(size_t newlen)
7717 int len = stackblocksize() - sstrnleft;
7721 sstrnleft = stackblocksize() - len;
7722 } while (sstrnleft < newlen);
7723 return stackblock() + len;
7728 static void ungrabstackstr(char *s, char *p)
7730 stacknleft += stacknxt - s;
7732 sstrnleft = stacknleft - (p - s);
7736 * Miscelaneous builtins.
7742 #if !defined(__GLIBC__) || __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
7743 typedef long rlim_t;
7749 * The read builtin. The -e option causes backslashes to escape the
7750 * following character.
7752 * This uses unbuffered input, which may be avoidable in some cases.
7755 static int readcmd(int argc, char **argv)
7770 while ((i = nextopt("p:r")) != '\0') {
7776 if (prompt && isatty(0)) {
7777 out2str(prompt); /* read without cmdedit */
7780 if (*(ap = argptr) == NULL)
7782 if ((ifs = bltinlookup("IFS")) == NULL)
7789 if (read(0, &c, 1) != 1) {
7801 if (!rflag && c == '\\') {
7807 if (startword && *ifs == ' ' && strchr(ifs, c)) {
7811 if (backslash && c == '\\') {
7812 if (read(0, &c, 1) != 1) {
7817 } else if (ap[1] != NULL && strchr(ifs, c) != NULL) {
7819 setvar(*ap, stackblock(), 0);
7828 /* Remove trailing blanks */
7829 while (stackblock() <= --p && strchr(ifs, *p) != NULL)
7831 setvar(*ap, stackblock(), 0);
7832 while (*++ap != NULL)
7833 setvar(*ap, nullstr, 0);
7839 static int umaskcmd(int argc, char **argv)
7841 static const char permuser[3] = "ugo";
7842 static const char permmode[3] = "rwx";
7843 static const short int permmask[] = {
7844 S_IRUSR, S_IWUSR, S_IXUSR,
7845 S_IRGRP, S_IWGRP, S_IXGRP,
7846 S_IROTH, S_IWOTH, S_IXOTH
7852 int symbolic_mode = 0;
7854 while (nextopt("S") != '\0') {
7863 if ((ap = *argptr) == NULL) {
7864 if (symbolic_mode) {
7868 for (i = 0; i < 3; i++) {
7873 for (j = 0; j < 3; j++) {
7874 if ((mask & permmask[3 * i + j]) == 0) {
7883 printf("%.4o\n", mask);
7886 if (is_digit((unsigned char) *ap)) {
7889 if (*ap >= '8' || *ap < '0')
7890 error("Illegal number: %s", argv[1]);
7891 mask = (mask << 3) + (*ap - '0');
7892 } while (*++ap != '\0');
7895 mask = ~mask & 0777;
7896 if (!parse_mode(ap, &mask)) {
7897 error("Illegal mode: %s", ap);
7899 umask(~mask & 0777);
7908 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
7909 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
7910 * ash by J.T. Conklin.
7918 short factor; /* multiply by to get rlim_{cur,max} values */
7921 static const struct limits limits[] = {
7923 {"time(seconds)", RLIMIT_CPU, 1},
7926 {"file(blocks)", RLIMIT_FSIZE, 512},
7929 {"data(kbytes)", RLIMIT_DATA, 1024},
7932 {"stack(kbytes)", RLIMIT_STACK, 1024},
7935 {"coredump(blocks)", RLIMIT_CORE, 512},
7938 {"memory(kbytes)", RLIMIT_RSS, 1024},
7940 #ifdef RLIMIT_MEMLOCK
7941 {"locked memory(kbytes)", RLIMIT_MEMLOCK, 1024},
7944 {"process(processes)", RLIMIT_NPROC, 1},
7946 #ifdef RLIMIT_NOFILE
7947 {"nofiles(descriptors)", RLIMIT_NOFILE, 1},
7950 {"vmemory(kbytes)", RLIMIT_VMEM, 1024},
7953 {"swap(kbytes)", RLIMIT_SWAP, 1024},
7958 static int ulimitcmd(int argc, char **argv)
7960 static const char unlimited_string[] = "unlimited";
7963 enum { SOFT = 0x1, HARD = 0x2 } how = SOFT | HARD;
7964 const struct limits *l;
7967 struct rlimit limit;
7971 while ((optc = nextopt("HSa"
7990 #ifdef RLIMIT_MEMLOCK
7996 #ifdef RLIMIT_NOFILE
8008 } else if (optc == 'S') {
8010 } else if (optc == 'a') {
8017 for (l = limits; l->name; l++) {
8018 if (l->name[0] == what)
8020 if (l->name[1] == 'w' && what == 'w')
8024 set = *argptr ? 1 : 0;
8028 if (all || argptr[1])
8029 error("too many arguments");
8030 if (strcmp(p, unlimited_string) == 0)
8031 val = RLIM_INFINITY;
8035 while ((c = *p++) >= '0' && c <= '9') {
8036 val = (val * 10) + (long) (c - '0');
8037 if (val < (rlim_t) 0)
8041 error("bad number");
8047 for (l = limits; l->name; l++) {
8048 printf("%-20s ", l->name);
8049 getrlimit(l->cmd, &limit);
8052 val = limit.rlim_cur;
8053 else if (how & HARD)
8054 val = limit.rlim_max;
8056 if (val == RLIM_INFINITY)
8057 puts(unlimited_string);
8060 printf("%lld\n", (long long) val);
8073 getrlimit(l->cmd, &limit);
8075 limit.rlim_max = val;
8077 limit.rlim_cur = val;
8078 if (setrlimit(l->cmd, &limit) < 0)
8079 error("error setting limit (%m)");
8084 * prefix -- see if pfx is a prefix of string.
8087 static int prefix(char const *pfx, char const *string)
8090 if (*pfx++ != *string++)
8097 * Return true if s is a string of digits, and save munber in intptr
8101 static int is_number(const char *p, int *intptr)
8109 ret += digit_val(*p);
8111 } while (*p != '\0');
8118 * Convert a string of digits to an integer, printing an error message on
8122 static int number(const char *s)
8126 if (!is_number(s, &i))
8127 error("Illegal number: %s", s);
8132 * Produce a possibly single quoted string suitable as input to the shell.
8133 * The return string is allocated on the stack.
8136 static char *single_quote(const char *s)
8144 size_t len1, len1p, len2, len2p;
8146 len1 = strcspn(s, "'");
8147 len2 = strspn(s + len1, "'");
8149 len1p = len1 ? len1 + 2 : len1;
8150 len2p = len2 + ((len2 < 2) ? len2 : 2);
8152 CHECKSTRSPACE(len1p + len2p + 1, p);
8157 memcpy(p + 1, s, len1);
8165 memcpy(q + 1, s, len2);
8168 } else if (len2 == 1) {
8174 STADJUST(len1p + len2p, p);
8179 return grabstackstr(p);
8183 * Routine for dealing with parsed shell commands.
8187 static void sizenodelist(const struct nodelist *);
8188 static struct nodelist *copynodelist(const struct nodelist *);
8189 static char *nodesavestr(const char *);
8191 #define CALCSIZE_TABLE
8192 #define COPYNODE_TABLE
8193 #if defined(CALCSIZE_TABLE) || defined(COPYNODE_TABLE)
8195 * To collect a lot of redundant code in case statements for copynode()
8196 * and calcsize(), we implement a mini language here. Each type of node
8197 * struct has an associated instruction sequence that operates on its
8198 * members via their offsets. The instruction are pack in unsigned chars
8199 * with format IIDDDDDE where the bits are
8200 * I : part of the instruction opcode, which are
8201 * 00 : member is a pointer to another node
8202 * 40 : member is an integer
8203 * 80 : member is a pointer to a nodelist
8204 * CC : member is a pointer to a char string
8205 * D : data - the actual offset of the member to operate on in the struct
8206 * (since we assume bit 0 is set, it is not shifted)
8207 * E : flag signaling end of instruction sequence
8209 * WARNING: In order to handle larger offsets for 64bit archs, this code
8210 * assumes that no offset can be an odd number and stores the
8211 * end-of-instructions flag in bit 0.
8214 #define NODE_INTEGER 0x40
8215 #define NODE_NODELIST 0x80
8216 #define NODE_CHARPTR 0xC0
8217 #define NODE_NOMORE 0x01 /* Note: no offset should be odd (aligned) */
8218 #define NODE_MBRMASK 0xC0
8219 #define NODE_OFFSETMASK 0x3E
8221 static const unsigned char copynode_ops[35] = {
8222 #define COPYNODE_OPS0 0
8223 offsetof(union node, nbinary.ch2),
8224 offsetof(union node, nbinary.ch1) | NODE_NOMORE,
8225 #define COPYNODE_OPS1 (COPYNODE_OPS0 + 2)
8226 offsetof(union node, ncmd.redirect),
8227 offsetof(union node, ncmd.args),
8228 offsetof(union node, ncmd.assign),
8229 offsetof(union node, ncmd.backgnd) | NODE_INTEGER | NODE_NOMORE,
8230 #define COPYNODE_OPS2 (COPYNODE_OPS1 + 4)
8231 offsetof(union node, npipe.cmdlist) | NODE_NODELIST,
8232 offsetof(union node, npipe.backgnd) | NODE_INTEGER | NODE_NOMORE,
8233 #define COPYNODE_OPS3 (COPYNODE_OPS2 + 2)
8234 offsetof(union node, nredir.redirect),
8235 offsetof(union node, nredir.n) | NODE_NOMORE,
8236 #define COPYNODE_OPS4 (COPYNODE_OPS3 + 2)
8237 offsetof(union node, nif.elsepart),
8238 offsetof(union node, nif.ifpart),
8239 offsetof(union node, nif.test) | NODE_NOMORE,
8240 #define COPYNODE_OPS5 (COPYNODE_OPS4 + 3)
8241 offsetof(union node, nfor.var) | NODE_CHARPTR,
8242 offsetof(union node, nfor.body),
8243 offsetof(union node, nfor.args) | NODE_NOMORE,
8244 #define COPYNODE_OPS6 (COPYNODE_OPS5 + 3)
8245 offsetof(union node, ncase.cases),
8246 offsetof(union node, ncase.expr) | NODE_NOMORE,
8247 #define COPYNODE_OPS7 (COPYNODE_OPS6 + 2)
8248 offsetof(union node, nclist.body),
8249 offsetof(union node, nclist.pattern),
8250 offsetof(union node, nclist.next) | NODE_NOMORE,
8251 #define COPYNODE_OPS8 (COPYNODE_OPS7 + 3)
8252 offsetof(union node, narg.backquote) | NODE_NODELIST,
8253 offsetof(union node, narg.text) | NODE_CHARPTR,
8254 offsetof(union node, narg.next) | NODE_NOMORE,
8255 #define COPYNODE_OPS9 (COPYNODE_OPS8 + 3)
8256 offsetof(union node, nfile.fname),
8257 offsetof(union node, nfile.fd) | NODE_INTEGER,
8258 offsetof(union node, nfile.next) | NODE_NOMORE,
8259 #define COPYNODE_OPS10 (COPYNODE_OPS9 + 3)
8260 offsetof(union node, ndup.vname),
8261 offsetof(union node, ndup.dupfd) | NODE_INTEGER,
8262 offsetof(union node, ndup.fd) | NODE_INTEGER,
8263 offsetof(union node, ndup.next) | NODE_NOMORE,
8264 #define COPYNODE_OPS11 (COPYNODE_OPS10 + 4)
8265 offsetof(union node, nhere.doc),
8266 offsetof(union node, nhere.fd) | NODE_INTEGER,
8267 offsetof(union node, nhere.next) | NODE_NOMORE,
8268 #define COPYNODE_OPS12 (COPYNODE_OPS11 + 3)
8269 offsetof(union node, nnot.com) | NODE_NOMORE,
8272 #if COPYNODE_OPS12 != 34
8273 #error COPYNODE_OPS12 is incorrect
8276 static const unsigned char copynode_ops_index[26] = {
8277 COPYNODE_OPS0, /* NSEMI */
8278 COPYNODE_OPS1, /* NCMD */
8279 COPYNODE_OPS2, /* NPIPE */
8280 COPYNODE_OPS3, /* NREDIR */
8281 COPYNODE_OPS3, /* NBACKGND */
8282 COPYNODE_OPS3, /* NSUBSHELL */
8283 COPYNODE_OPS0, /* NAND */
8284 COPYNODE_OPS0, /* NOR */
8285 COPYNODE_OPS4, /* NIF */
8286 COPYNODE_OPS0, /* NWHILE */
8287 COPYNODE_OPS0, /* NUNTIL */
8288 COPYNODE_OPS5, /* NFOR */
8289 COPYNODE_OPS6, /* NCASE */
8290 COPYNODE_OPS7, /* NCLIST */
8291 COPYNODE_OPS8, /* NDEFUN */
8292 COPYNODE_OPS8, /* NARG */
8293 COPYNODE_OPS9, /* NTO */
8294 COPYNODE_OPS9, /* NFROM */
8295 COPYNODE_OPS9, /* NFROMTO */
8296 COPYNODE_OPS9, /* NAPPEND */
8297 COPYNODE_OPS9, /* NTOOV */
8298 COPYNODE_OPS10, /* NTOFD */
8299 COPYNODE_OPS10, /* NFROMFD */
8300 COPYNODE_OPS11, /* NHERE */
8301 COPYNODE_OPS11, /* NXHERE */
8302 COPYNODE_OPS12, /* NNOT */
8305 #if NODE_CHARPTR != NODE_MBRMASK
8306 #error NODE_CHARPTR != NODE_MBRMASK!!!
8308 #endif /* defined(CALCSIZE_TABLE) || defined(COPYNODE_TABLE) */
8310 #ifdef COPYNODE_TABLE
8311 static union node *copynode(const union node *n)
8314 const unsigned char *p;
8320 new->type = n->type;
8321 funcblock = (char *) funcblock + (int) nodesize[n->type];
8322 p = copynode_ops + (int) copynode_ops_index[n->type];
8324 char *nn = ((char *) new) + ((int) (*p & NODE_OFFSETMASK));
8325 const char *no = ((const char *) n) + ((int) (*p & NODE_OFFSETMASK));
8327 if (!(*p & NODE_MBRMASK)) { /* standard node */
8328 *((union node **) nn) = copynode(*((const union node **) no));
8329 } else if ((*p & NODE_MBRMASK) == NODE_CHARPTR) { /* string */
8330 *((const char **) nn) = nodesavestr(*((const char **) no));
8331 } else if (*p & NODE_NODELIST) { /* nodelist */
8332 *((struct nodelist **) nn)
8333 = copynodelist(*((const struct nodelist **) no));
8334 } else { /* integer */
8335 *((int *) nn) = *((int *) no);
8337 } while (!(*p++ & NODE_NOMORE));
8340 #else /* COPYNODE_TABLE */
8341 static union node *copynode(const union node *n)
8348 funcblock = (char *) funcblock + nodesize[n->type];
8355 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8356 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8359 new->ncmd.redirect = copynode(n->ncmd.redirect);
8360 new->ncmd.args = copynode(n->ncmd.args);
8361 new->ncmd.assign = copynode(n->ncmd.assign);
8362 new->ncmd.backgnd = n->ncmd.backgnd;
8365 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8366 new->npipe.backgnd = n->npipe.backgnd;
8371 new->nredir.redirect = copynode(n->nredir.redirect);
8372 new->nredir.n = copynode(n->nredir.n);
8375 new->nif.elsepart = copynode(n->nif.elsepart);
8376 new->nif.ifpart = copynode(n->nif.ifpart);
8377 new->nif.test = copynode(n->nif.test);
8380 new->nfor.var = nodesavestr(n->nfor.var);
8381 new->nfor.body = copynode(n->nfor.body);
8382 new->nfor.args = copynode(n->nfor.args);
8385 new->ncase.cases = copynode(n->ncase.cases);
8386 new->ncase.expr = copynode(n->ncase.expr);
8389 new->nclist.body = copynode(n->nclist.body);
8390 new->nclist.pattern = copynode(n->nclist.pattern);
8391 new->nclist.next = copynode(n->nclist.next);
8395 new->narg.backquote = copynodelist(n->narg.backquote);
8396 new->narg.text = nodesavestr(n->narg.text);
8397 new->narg.next = copynode(n->narg.next);
8404 new->nfile.fname = copynode(n->nfile.fname);
8405 new->nfile.fd = n->nfile.fd;
8406 new->nfile.next = copynode(n->nfile.next);
8410 new->ndup.vname = copynode(n->ndup.vname);
8411 new->ndup.dupfd = n->ndup.dupfd;
8412 new->ndup.fd = n->ndup.fd;
8413 new->ndup.next = copynode(n->ndup.next);
8417 new->nhere.doc = copynode(n->nhere.doc);
8418 new->nhere.fd = n->nhere.fd;
8419 new->nhere.next = copynode(n->nhere.next);
8422 new->nnot.com = copynode(n->nnot.com);
8425 new->type = n->type;
8428 #endif /* COPYNODE_TABLE */
8430 #ifdef CALCSIZE_TABLE
8431 static void calcsize(const union node *n)
8433 const unsigned char *p;
8437 funcblocksize += (int) nodesize[n->type];
8439 p = copynode_ops + (int) copynode_ops_index[n->type];
8441 const char *no = ((const char *) n) + ((int) (*p & NODE_OFFSETMASK));
8443 if (!(*p & NODE_MBRMASK)) { /* standard node */
8444 calcsize(*((const union node **) no));
8445 } else if ((*p & NODE_MBRMASK) == NODE_CHARPTR) { /* string */
8446 funcstringsize += strlen(*((const char **) no)) + 1;
8447 } else if (*p & NODE_NODELIST) { /* nodelist */
8448 sizenodelist(*((const struct nodelist **) no));
8449 } /* else integer -- ignore */
8450 } while (!(*p++ & NODE_NOMORE));
8452 #else /* CALCSIZE_TABLE */
8453 static void calcsize(const union node *n)
8457 funcblocksize += nodesize[n->type];
8464 calcsize(n->nbinary.ch2);
8465 calcsize(n->nbinary.ch1);
8468 calcsize(n->ncmd.redirect);
8469 calcsize(n->ncmd.args);
8470 calcsize(n->ncmd.assign);
8473 sizenodelist(n->npipe.cmdlist);
8478 calcsize(n->nredir.redirect);
8479 calcsize(n->nredir.n);
8482 calcsize(n->nif.elsepart);
8483 calcsize(n->nif.ifpart);
8484 calcsize(n->nif.test);
8487 funcstringsize += strlen(n->nfor.var) + 1;
8488 calcsize(n->nfor.body);
8489 calcsize(n->nfor.args);
8492 calcsize(n->ncase.cases);
8493 calcsize(n->ncase.expr);
8496 calcsize(n->nclist.body);
8497 calcsize(n->nclist.pattern);
8498 calcsize(n->nclist.next);
8502 sizenodelist(n->narg.backquote);
8503 funcstringsize += strlen(n->narg.text) + 1;
8504 calcsize(n->narg.next);
8511 calcsize(n->nfile.fname);
8512 calcsize(n->nfile.next);
8516 calcsize(n->ndup.vname);
8517 calcsize(n->ndup.next);
8521 calcsize(n->nhere.doc);
8522 calcsize(n->nhere.next);
8525 calcsize(n->nnot.com);
8529 #endif /* CALCSIZE_TABLE */
8531 static void sizenodelist(const struct nodelist *lp)
8534 funcblocksize += ALIGN(sizeof(struct nodelist));
8541 static struct nodelist *copynodelist(const struct nodelist *lp)
8543 struct nodelist *start;
8544 struct nodelist **lpp;
8549 funcblock = (char *) funcblock + ALIGN(sizeof(struct nodelist));
8550 (*lpp)->n = copynode(lp->n);
8552 lpp = &(*lpp)->next;
8559 static char *nodesavestr(const char *s)
8562 char *q = funcstring;
8563 char *rtn = funcstring;
8565 while ((*q++ = *p++) != '\0')
8571 #ifdef CONFIG_ASH_GETOPTS
8572 static int getopts(char *, char *, char **, int *, int *);
8576 * Process the shell command line arguments.
8579 static void procargs(int argc, char **argv)
8586 for (i = 0; i < NOPTS; i++)
8589 if (*argptr == NULL && minusc == NULL)
8591 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
8595 for (i = 0; i < NOPTS; i++)
8596 if (optent_val(i) == 2)
8599 if (sflag == 0 && minusc == NULL) {
8600 commandname = argv[0];
8602 setinputfile(arg0, 0);
8605 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
8606 if (argptr && minusc && *argptr)
8609 shellparam.p = argptr;
8610 shellparam.optind = 1;
8611 shellparam.optoff = -1;
8612 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
8614 shellparam.nparam++;
8623 * Process shell options. The global variable argptr contains a pointer
8624 * to the argument list; we advance it past the options.
8627 static inline void minus_o(const char *name, int val)
8632 out1str("Current option settings\n");
8633 for (i = 0; i < NOPTS; i++)
8634 printf("%-16s%s\n", optent_name(optlist[i]),
8635 optent_val(i) ? "on" : "off");
8637 for (i = 0; i < NOPTS; i++)
8638 if (equal(name, optent_name(optlist[i]))) {
8639 setoption(optent_letter(optlist[i]), val);
8642 error("Illegal option -o %s", name);
8647 static void options(int cmdline)
8655 while ((p = *argptr) != NULL) {
8657 if ((c = *p++) == '-') {
8659 if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
8661 /* "-" means turn off -x and -v */
8664 /* "--" means reset params */
8665 else if (*argptr == NULL)
8668 break; /* "-" or "--" terminates options */
8670 } else if (c == '+') {
8676 while ((c = *p++) != '\0') {
8677 if (c == 'c' && cmdline) {
8680 #ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
8684 if (q == NULL || minusc != NULL)
8685 error("Bad -c option");
8690 } else if (c == 'o') {
8691 minus_o(*argptr, val);
8694 } else if (cmdline && (c == '-')) { // long options
8695 if (strcmp(p, "login") == 0)
8706 static void setoption(int flag, int val)
8710 for (i = 0; i < NOPTS; i++)
8711 if (optent_letter(optlist[i]) == flag) {
8712 optent_val(i) = val;
8714 /* #%$ hack for ksh semantics */
8717 else if (flag == 'E')
8722 error("Illegal option -%c", flag);
8729 * Set the shell parameters.
8732 static void setparam(char **argv)
8738 for (nparam = 0; argv[nparam]; nparam++);
8739 ap = newparam = xmalloc((nparam + 1) * sizeof *ap);
8741 *ap++ = xstrdup(*argv++);
8744 freeparam(&shellparam);
8745 shellparam.malloc = 1;
8746 shellparam.nparam = nparam;
8747 shellparam.p = newparam;
8748 shellparam.optind = 1;
8749 shellparam.optoff = -1;
8754 * Free the list of positional parameters.
8757 static void freeparam(volatile struct shparam *param)
8761 if (param->malloc) {
8762 for (ap = param->p; *ap; ap++)
8771 * The shift builtin command.
8774 static int shiftcmd(int argc, char **argv)
8781 n = number(argv[1]);
8782 if (n > shellparam.nparam)
8783 error("can't shift that many");
8785 shellparam.nparam -= n;
8786 for (ap1 = shellparam.p; --n >= 0; ap1++) {
8787 if (shellparam.malloc)
8791 while ((*ap2++ = *ap1++) != NULL);
8792 shellparam.optind = 1;
8793 shellparam.optoff = -1;
8801 * The set command builtin.
8804 static int setcmd(int argc, char **argv)
8807 return showvarscmd(argc, argv);
8811 if (*argptr != NULL) {
8819 static void getoptsreset(const char *value)
8821 shellparam.optind = number(value);
8822 shellparam.optoff = -1;
8825 #ifdef CONFIG_LOCALE_SUPPORT
8826 static void change_lc_all(const char *value)
8828 if (value != 0 && *value != 0)
8829 setlocale(LC_ALL, value);
8832 static void change_lc_ctype(const char *value)
8834 if (value != 0 && *value != 0)
8835 setlocale(LC_CTYPE, value);
8840 #ifdef CONFIG_ASH_GETOPTS
8842 * The getopts builtin. Shellparam.optnext points to the next argument
8843 * to be processed. Shellparam.optptr points to the next character to
8844 * be processed in the current argument. If shellparam.optnext is NULL,
8845 * then it's the first time getopts has been called.
8848 static int getoptscmd(int argc, char **argv)
8853 error("Usage: getopts optstring var [arg]");
8854 else if (argc == 3) {
8855 optbase = shellparam.p;
8856 if (shellparam.optind > shellparam.nparam + 1) {
8857 shellparam.optind = 1;
8858 shellparam.optoff = -1;
8862 if (shellparam.optind > argc - 2) {
8863 shellparam.optind = 1;
8864 shellparam.optoff = -1;
8868 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
8869 &shellparam.optoff);
8873 * Safe version of setvar, returns 1 on success 0 on failure.
8876 static int setvarsafe(const char *name, const char *val, int flags)
8878 struct jmploc jmploc;
8879 struct jmploc *volatile savehandler = handler;
8886 if (setjmp(jmploc.loc))
8890 setvar(name, val, flags);
8892 handler = savehandler;
8897 getopts(char *optstr, char *optvar, char **optfirst, int *myoptind,
8905 char **optnext = optfirst + *myoptind - 1;
8907 if (*myoptind <= 1 || *optoff < 0 || !(*(optnext - 1)) ||
8908 strlen(*(optnext - 1)) < *optoff)
8911 p = *(optnext - 1) + *optoff;
8912 if (p == NULL || *p == '\0') {
8913 /* Current word is done, advance */
8914 if (optnext == NULL)
8917 if (p == NULL || *p != '-' || *++p == '\0') {
8919 *myoptind = optnext - optfirst + 1;
8925 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
8930 for (q = optstr; *q != c;) {
8932 if (optstr[0] == ':') {
8935 err |= setvarsafe("OPTARG", s, 0);
8937 out2fmt("Illegal option -%c\n", c);
8938 (void) unsetvar("OPTARG");
8948 if (*p == '\0' && (p = *optnext) == NULL) {
8949 if (optstr[0] == ':') {
8952 err |= setvarsafe("OPTARG", s, 0);
8955 out2fmt("No arg for -%c option\n", c);
8956 (void) unsetvar("OPTARG");
8964 setvarsafe("OPTARG", p, 0);
8967 setvarsafe("OPTARG", "", 0);
8968 *myoptind = optnext - optfirst + 1;
8975 *optoff = p ? p - *(optnext - 1) : -1;
8976 snprintf(s, sizeof(s), "%d", *myoptind);
8977 err |= setvarsafe("OPTIND", s, VNOFUNC);
8980 err |= setvarsafe(optvar, s, 0);
8991 * XXX - should get rid of. have all builtins use getopt(3). the
8992 * library getopt must have the BSD extension static variable "optreset"
8993 * otherwise it can't be used within the shell safely.
8995 * Standard option processing (a la getopt) for builtin routines. The
8996 * only argument that is passed to nextopt is the option string; the
8997 * other arguments are unnecessary. It return the character, or '\0' on
9001 static int nextopt(const char *optstring)
9007 if ((p = optptr) == NULL || *p == '\0') {
9009 if (p == NULL || *p != '-' || *++p == '\0')
9012 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
9016 for (q = optstring; *q != c;) {
9018 error("Illegal option -%c", c);
9023 if (*p == '\0' && (p = *argptr++) == NULL)
9024 error("No arg for -%c option", c);
9032 static void flushall()
9040 static void out2fmt(const char *fmt, ...)
9045 vfprintf(stderr, fmt, ap);
9050 * Version of write which resumes after a signal is caught.
9053 static int xwrite(int fd, const char *buf, int nbytes)
9062 i = write(fd, buf, n);
9068 } else if (i == 0) {
9071 } else if (errno != EINTR) {
9079 * Shell command parser.
9082 #define EOFMARKLEN 79
9087 struct heredoc *next; /* next here document in list */
9088 union node *here; /* redirection node */
9089 char *eofmark; /* string indicating end of input */
9090 int striptabs; /* if set, strip leading tabs */
9093 static struct heredoc *heredoclist; /* list of here documents to read */
9094 static int parsebackquote; /* nonzero if we are inside backquotes */
9095 static int doprompt; /* if set, prompt the user */
9096 static int needprompt; /* true if interactive and at start of line */
9097 static int lasttoken; /* last token read */
9099 static char *wordtext; /* text of last word returned by readtoken */
9101 static struct nodelist *backquotelist;
9102 static union node *redirnode;
9103 static struct heredoc *heredoc;
9104 static int quoteflag; /* set if (part of) last token was quoted */
9105 static int startlinno; /* line # where last token started */
9108 static union node *list(int);
9109 static union node *andor(void);
9110 static union node *pipeline(void);
9111 static union node *command(void);
9112 static union node *simplecmd(union node **rpp, union node *redir);
9113 static void parsefname(void);
9114 static void parseheredoc(void);
9115 static char peektoken(void);
9116 static int readtoken(void);
9117 static int xxreadtoken(void);
9118 static int readtoken1(int, int, const char *, int);
9119 static int noexpand(char *);
9120 static void synexpect(int) __attribute__ ((noreturn));
9121 static void synerror(const char *) __attribute__ ((noreturn));
9122 static void setprompt(int);
9126 * Read and parse a command. Returns NEOF on end of file. (NULL is a
9127 * valid parse tree indicating a blank line.)
9130 static union node *parsecmd(int interact)
9135 doprompt = interact;
9151 static union node *list(int nlflag)
9153 union node *n1, *n2, *n3;
9157 if (nlflag == 0 && peektoken())
9163 if (tok == TBACKGND) {
9164 if (n2->type == NCMD || n2->type == NPIPE) {
9165 n2->ncmd.backgnd = 1;
9166 } else if (n2->type == NREDIR) {
9167 n2->type = NBACKGND;
9169 n3 = (union node *) stalloc(sizeof(struct nredir));
9170 n3->type = NBACKGND;
9172 n3->nredir.redirect = NULL;
9179 n3 = (union node *) stalloc(sizeof(struct nbinary));
9181 n3->nbinary.ch1 = n1;
9182 n3->nbinary.ch2 = n2;
9206 pungetc(); /* push back EOF on input */
9219 static union node *andor()
9221 union node *n1, *n2, *n3;
9227 if ((t = readtoken()) == TAND) {
9229 } else if (t == TOR) {
9237 n3 = (union node *) stalloc(sizeof(struct nbinary));
9239 n3->nbinary.ch1 = n1;
9240 n3->nbinary.ch2 = n2;
9247 static union node *pipeline()
9249 union node *n1, *n2, *pipenode;
9250 struct nodelist *lp, *prev;
9254 TRACE(("pipeline: entered\n"));
9255 if (readtoken() == TNOT) {
9261 if (readtoken() == TPIPE) {
9262 pipenode = (union node *) stalloc(sizeof(struct npipe));
9263 pipenode->type = NPIPE;
9264 pipenode->npipe.backgnd = 0;
9265 lp = (struct nodelist *) stalloc(sizeof(struct nodelist));
9266 pipenode->npipe.cmdlist = lp;
9270 lp = (struct nodelist *) stalloc(sizeof(struct nodelist));
9274 } while (readtoken() == TPIPE);
9280 n2 = (union node *) stalloc(sizeof(struct nnot));
9290 static union node *command(void)
9292 union node *n1, *n2;
9293 union node *ap, **app;
9294 union node *cp, **cpp;
9295 union node *redir, **rpp;
9302 /* Check for redirection which may precede command */
9303 while (readtoken() == TREDIR) {
9304 *rpp = n2 = redirnode;
9305 rpp = &n2->nfile.next;
9310 switch (readtoken()) {
9312 n1 = (union node *) stalloc(sizeof(struct nif));
9314 n1->nif.test = list(0);
9315 if (readtoken() != TTHEN)
9317 n1->nif.ifpart = list(0);
9319 while (readtoken() == TELIF) {
9320 n2->nif.elsepart = (union node *) stalloc(sizeof(struct nif));
9321 n2 = n2->nif.elsepart;
9323 n2->nif.test = list(0);
9324 if (readtoken() != TTHEN)
9326 n2->nif.ifpart = list(0);
9328 if (lasttoken == TELSE)
9329 n2->nif.elsepart = list(0);
9331 n2->nif.elsepart = NULL;
9334 if (readtoken() != TFI)
9341 n1 = (union node *) stalloc(sizeof(struct nbinary));
9342 n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL;
9343 n1->nbinary.ch1 = list(0);
9344 if ((got = readtoken()) != TDO) {
9345 TRACE(("expecting DO got %s %s\n", tokname(got),
9346 got == TWORD ? wordtext : ""));
9349 n1->nbinary.ch2 = list(0);
9350 if (readtoken() != TDONE)
9356 if (readtoken() != TWORD || quoteflag || !goodname(wordtext))
9357 synerror("Bad for loop variable");
9358 n1 = (union node *) stalloc(sizeof(struct nfor));
9360 n1->nfor.var = wordtext;
9362 if (readtoken() == TIN) {
9364 while (readtoken() == TWORD) {
9365 n2 = (union node *) stalloc(sizeof(struct narg));
9367 n2->narg.text = wordtext;
9368 n2->narg.backquote = backquotelist;
9370 app = &n2->narg.next;
9374 if (lasttoken != TNL && lasttoken != TSEMI)
9377 static char argvars[5] = { CTLVAR, VSNORMAL | VSQUOTE,
9380 n2 = (union node *) stalloc(sizeof(struct narg));
9382 n2->narg.text = argvars;
9383 n2->narg.backquote = NULL;
9384 n2->narg.next = NULL;
9387 * Newline or semicolon here is optional (but note
9388 * that the original Bourne shell only allowed NL).
9390 if (lasttoken != TNL && lasttoken != TSEMI)
9394 if (readtoken() != TDO)
9396 n1->nfor.body = list(0);
9397 if (readtoken() != TDONE)
9402 n1 = (union node *) stalloc(sizeof(struct ncase));
9404 if (readtoken() != TWORD)
9406 n1->ncase.expr = n2 = (union node *) stalloc(sizeof(struct narg));
9408 n2->narg.text = wordtext;
9409 n2->narg.backquote = backquotelist;
9410 n2->narg.next = NULL;
9413 } while (readtoken() == TNL);
9414 if (lasttoken != TIN)
9415 synerror("expecting \"in\"");
9416 cpp = &n1->ncase.cases;
9417 checkkwd = 2, readtoken();
9419 if (lasttoken == TLP)
9421 *cpp = cp = (union node *) stalloc(sizeof(struct nclist));
9423 app = &cp->nclist.pattern;
9425 *app = ap = (union node *) stalloc(sizeof(struct narg));
9427 ap->narg.text = wordtext;
9428 ap->narg.backquote = backquotelist;
9429 if (checkkwd = 2, readtoken() != TPIPE)
9431 app = &ap->narg.next;
9434 ap->narg.next = NULL;
9435 if (lasttoken != TRP)
9437 cp->nclist.body = list(0);
9440 if ((t = readtoken()) != TESAC) {
9442 synexpect(TENDCASE);
9444 checkkwd = 2, readtoken();
9446 cpp = &cp->nclist.next;
9447 } while (lasttoken != TESAC);
9452 n1 = (union node *) stalloc(sizeof(struct nredir));
9453 n1->type = NSUBSHELL;
9454 n1->nredir.n = list(0);
9455 n1->nredir.redirect = NULL;
9456 if (readtoken() != TRP)
9462 if (readtoken() != TEND)
9466 /* Handle an empty command like other simple commands. */
9475 * An empty command before a ; doesn't make much sense, and
9476 * should certainly be disallowed in the case of `if ;'.
9482 n1 = simplecmd(rpp, redir);
9489 /* Now check for redirection which may follow command */
9490 while (readtoken() == TREDIR) {
9491 *rpp = n2 = redirnode;
9492 rpp = &n2->nfile.next;
9498 if (n1->type != NSUBSHELL) {
9499 n2 = (union node *) stalloc(sizeof(struct nredir));
9504 n1->nredir.redirect = redir;
9511 static union node *simplecmd(union node **rpp, union node *redir)
9513 union node *args, **app;
9514 union node *n = NULL;
9515 union node *vars, **vpp;
9516 union node **orig_rpp;
9523 /* If we don't have any redirections already, then we must reset
9524 rpp to be the address of the local redir variable. */
9527 /* We save the incoming value, because we need this for shell
9528 functions. There can not be a redirect or an argument between
9529 the function name and the open parenthesis. */
9534 switch (readtoken()) {
9537 n = (union node *) stalloc(sizeof(struct narg));
9539 n->narg.text = wordtext;
9540 n->narg.backquote = backquotelist;
9541 if (lasttoken == TWORD) {
9543 app = &n->narg.next;
9546 vpp = &n->narg.next;
9550 *rpp = n = redirnode;
9551 rpp = &n->nfile.next;
9552 parsefname(); /* read name of redirection file */
9555 if (args && app == &args->narg.next && !vars && rpp == orig_rpp) {
9556 /* We have a function */
9557 if (readtoken() != TRP)
9561 n->narg.next = command();
9574 n = (union node *) stalloc(sizeof(struct ncmd));
9576 n->ncmd.backgnd = 0;
9577 n->ncmd.args = args;
9578 n->ncmd.assign = vars;
9579 n->ncmd.redirect = redir;
9583 static union node *makename(void)
9587 n = (union node *) stalloc(sizeof(struct narg));
9589 n->narg.next = NULL;
9590 n->narg.text = wordtext;
9591 n->narg.backquote = backquotelist;
9595 static void fixredir(union node *n, const char *text, int err)
9597 TRACE(("Fix redir %s %d\n", text, err));
9599 n->ndup.vname = NULL;
9601 if (is_digit(text[0]) && text[1] == '\0')
9602 n->ndup.dupfd = digit_val(text[0]);
9603 else if (text[0] == '-' && text[1] == '\0')
9608 synerror("Bad fd number");
9610 n->ndup.vname = makename();
9615 static void parsefname(void)
9617 union node *n = redirnode;
9619 if (readtoken() != TWORD)
9621 if (n->type == NHERE) {
9622 struct heredoc *here = heredoc;
9628 TRACE(("Here document %d\n", n->type));
9629 if (here->striptabs) {
9630 while (*wordtext == '\t')
9633 if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0
9635 synerror("Illegal eof marker for << redirection");
9636 rmescapes(wordtext);
9637 here->eofmark = wordtext;
9639 if (heredoclist == NULL)
9642 for (p = heredoclist; p->next; p = p->next);
9645 } else if (n->type == NTOFD || n->type == NFROMFD) {
9646 fixredir(n, wordtext, 0);
9648 n->nfile.fname = makename();
9654 * Input any here documents.
9657 static void parseheredoc()
9659 struct heredoc *here;
9662 while (heredoclist) {
9664 heredoclist = here->next;
9669 readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX,
9670 here->eofmark, here->striptabs);
9671 n = (union node *) stalloc(sizeof(struct narg));
9672 n->narg.type = NARG;
9673 n->narg.next = NULL;
9674 n->narg.text = wordtext;
9675 n->narg.backquote = backquotelist;
9676 here->here->nhere.doc = n;
9680 static char peektoken()
9686 return tokname_array[t][0];
9689 static int readtoken()
9693 int savecheckalias = checkalias;
9695 #ifdef CONFIG_ASH_ALIAS
9696 int savecheckkwd = checkkwd;
9701 int alreadyseen = tokpushback;
9704 #ifdef CONFIG_ASH_ALIAS
9710 checkalias = savecheckalias;
9716 if (checkkwd == 2) {
9725 * check for keywords
9727 if (t == TWORD && !quoteflag) {
9728 const char *const *pp;
9730 if ((pp = findkwd(wordtext))) {
9731 lasttoken = t = pp - tokname_array;
9732 TRACE(("keyword %s recognized\n", tokname(t)));
9743 } else if (checkalias == 2 && isassignment(wordtext)) {
9744 lasttoken = t = TASSIGN;
9745 } else if (checkalias) {
9746 #ifdef CONFIG_ASH_ALIAS
9747 if (!quoteflag && (ap = *__lookupalias(wordtext)) != NULL
9748 && !(ap->flag & ALIASINUSE)) {
9750 pushstring(ap->val, strlen(ap->val), ap);
9752 checkkwd = savecheckkwd;
9761 TRACE(("token %s %s\n", tokname(t), t == TWORD
9762 || t == TASSIGN ? wordtext : ""));
9764 TRACE(("reread token %s %s\n", tokname(t), t == TWORD
9765 || t == TASSIGN ? wordtext : ""));
9772 * Read the next input token.
9773 * If the token is a word, we set backquotelist to the list of cmds in
9774 * backquotes. We set quoteflag to true if any part of the word was
9776 * If the token is TREDIR, then we set redirnode to a structure containing
9778 * In all cases, the variable startlinno is set to the number of the line
9779 * on which the token starts.
9781 * [Change comment: here documents and internal procedures]
9782 * [Readtoken shouldn't have any arguments. Perhaps we should make the
9783 * word parsing code into a separate routine. In this case, readtoken
9784 * doesn't need to have any internal procedures, but parseword does.
9785 * We could also make parseoperator in essence the main routine, and
9786 * have parseword (readtoken1?) handle both words and redirection.]
9789 #define NEW_xxreadtoken
9790 #ifdef NEW_xxreadtoken
9792 static const char xxreadtoken_chars[] = "\n()&|;"; /* singles must be first! */
9793 static const char xxreadtoken_tokens[] = {
9794 TNL, TLP, TRP, /* only single occurrence allowed */
9795 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
9796 TEOF, /* corresponds to trailing nul */
9797 TAND, TOR, TENDCASE, /* if double occurrence */
9800 #define xxreadtoken_doubles \
9801 (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
9802 #define xxreadtoken_singles \
9803 (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
9805 static int xxreadtoken()
9817 startlinno = plinno;
9818 for (;;) { /* until token or start of word found */
9821 if ((c != ' ') && (c != '\t')
9822 #ifdef CONFIG_ASH_ALIAS
9827 while ((c = pgetc()) != '\n' && c != PEOF);
9829 } else if (c == '\\') {
9830 if (pgetc() != '\n') {
9834 startlinno = ++plinno;
9835 setprompt(doprompt ? 2 : 0);
9838 = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
9843 needprompt = doprompt;
9846 p = strchr(xxreadtoken_chars, c);
9849 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
9852 if (p - xxreadtoken_chars >= xxreadtoken_singles) {
9853 if (pgetc() == *p) { /* double occurrence? */
9854 p += xxreadtoken_doubles + 1;
9861 return lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
9869 #define RETURN(token) return lasttoken = token
9871 static int xxreadtoken()
9883 startlinno = plinno;
9884 for (;;) { /* until token or start of word found */
9889 #ifdef CONFIG_ASH_ALIAS
9894 while ((c = pgetc()) != '\n' && c != PEOF);
9898 if (pgetc() == '\n') {
9899 startlinno = ++plinno;
9910 needprompt = doprompt;
9938 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
9944 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
9945 * is not NULL, read a here document. In the latter case, eofmark is the
9946 * word which marks the end of the document and striptabs is true if
9947 * leading tabs should be stripped from the document. The argument firstc
9948 * is the first character of the input token or document.
9950 * Because C does not have internal subroutines, I have simulated them
9951 * using goto's to implement the subroutine linkage. The following macros
9952 * will run code that appears at the end of readtoken1.
9955 #define CHECKEND() {goto checkend; checkend_return:;}
9956 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
9957 #define PARSESUB() {goto parsesub; parsesub_return:;}
9958 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
9959 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
9960 #define PARSEARITH() {goto parsearith; parsearith_return:;}
9963 readtoken1(int firstc, int syntax, const char *eofmark, int striptabs)
9968 char line[EOFMARKLEN + 1];
9969 struct nodelist *bqlist;
9972 int varnest; /* levels of variables expansion */
9973 int arinest; /* levels of arithmetic expansion */
9974 int parenlevel; /* levels of parens in arithmetic */
9975 int dqvarnest; /* levels of variables expansion within double quotes */
9977 int prevsyntax; /* syntax before arithmetic */
9980 /* Avoid longjmp clobbering */
9993 startlinno = plinno;
9995 if (syntax == DQSYNTAX)
10004 STARTSTACKSTR(out);
10005 loop:{ /* for each line, until end of word */
10006 CHECKEND(); /* set c to PEOF if at end of here document */
10007 for (;;) { /* until end of line or end of word */
10008 CHECKSTRSPACE(3, out); /* permit 3 calls to USTPUTC */
10009 switch (SIT(c, syntax)) {
10010 case CNL: /* '\n' */
10011 if (syntax == BASESYNTAX)
10012 goto endword; /* exit outer loop */
10020 goto loop; /* continue outer loop */
10025 if ((eofmark == NULL || dblquote) && dqvarnest == 0)
10026 USTPUTC(CTLESC, out);
10029 case CBACK: /* backslash */
10032 USTPUTC('\\', out);
10034 } else if (c == '\n') {
10040 if (dblquote && c != '\\' && c != '`' && c != '$'
10041 && (c != '"' || eofmark != NULL))
10042 USTPUTC('\\', out);
10043 if (SIT(c, SQSYNTAX) == CCTL)
10044 USTPUTC(CTLESC, out);
10045 else if (eofmark == NULL)
10046 USTPUTC(CTLQUOTEMARK, out);
10052 if (eofmark == NULL)
10053 USTPUTC(CTLQUOTEMARK, out);
10057 if (eofmark == NULL)
10058 USTPUTC(CTLQUOTEMARK, out);
10063 if (eofmark != NULL && arinest == 0 && varnest == 0) {
10067 syntax = ARISYNTAX;
10069 } else if (eofmark == NULL && dqvarnest == 0) {
10070 syntax = BASESYNTAX;
10076 case CVAR: /* '$' */
10077 PARSESUB(); /* parse substitution */
10079 case CENDVAR: /* '}' */
10082 if (dqvarnest > 0) {
10085 USTPUTC(CTLENDVAR, out);
10090 #ifdef CONFIG_ASH_MATH_SUPPORT
10091 case CLP: /* '(' in arithmetic */
10095 case CRP: /* ')' in arithmetic */
10096 if (parenlevel > 0) {
10100 if (pgetc() == ')') {
10101 if (--arinest == 0) {
10102 USTPUTC(CTLENDARI, out);
10103 syntax = prevsyntax;
10104 if (syntax == DQSYNTAX)
10112 * unbalanced parens
10113 * (don't 2nd guess - no error)
10121 case CBQUOTE: /* '`' */
10125 goto endword; /* exit outer loop */
10130 goto endword; /* exit outer loop */
10131 #ifdef CONFIG_ASH_ALIAS
10141 if (syntax == ARISYNTAX)
10142 synerror("Missing '))'");
10143 if (syntax != BASESYNTAX && !parsebackquote && eofmark == NULL)
10144 synerror("Unterminated quoted string");
10145 if (varnest != 0) {
10146 startlinno = plinno;
10147 synerror("Missing '}'");
10149 USTPUTC('\0', out);
10150 len = out - stackblock();
10151 out = stackblock();
10152 if (eofmark == NULL) {
10153 if ((c == '>' || c == '<')
10154 && quotef == 0 && len <= 2 && (*out == '\0' || is_digit(*out))) {
10156 return lasttoken = TREDIR;
10161 quoteflag = quotef;
10162 backquotelist = bqlist;
10163 grabstackblock(len);
10165 return lasttoken = TWORD;
10166 /* end of readtoken routine */
10171 * Check to see whether we are at the end of the here document. When this
10172 * is called, c is set to the first character of the next input line. If
10173 * we are at the end of the here document, this routine sets the c to PEOF.
10178 #ifdef CONFIG_ASH_ALIAS
10184 while (c == '\t') {
10188 if (c == *eofmark) {
10189 if (pfgets(line, sizeof line) != NULL) {
10193 for (q = eofmark + 1; *q && *p == *q; p++, q++);
10194 if (*p == '\n' && *q == '\0') {
10197 needprompt = doprompt;
10199 pushstring(line, strlen(line), NULL);
10204 goto checkend_return;
10209 * Parse a redirection operator. The variable "out" points to a string
10210 * specifying the fd to be redirected. The variable "c" contains the
10211 * first character of the redirection operator.
10218 np = (union node *) stalloc(sizeof(struct nfile));
10223 np->type = NAPPEND;
10232 } else { /* c == '<' */
10234 switch (c = pgetc()) {
10236 if (sizeof(struct nfile) != sizeof(struct nhere)) {
10237 np = (union node *) stalloc(sizeof(struct nhere));
10241 heredoc = (struct heredoc *) stalloc(sizeof(struct heredoc));
10242 heredoc->here = np;
10243 if ((c = pgetc()) == '-') {
10244 heredoc->striptabs = 1;
10246 heredoc->striptabs = 0;
10252 np->type = NFROMFD;
10256 np->type = NFROMTO;
10266 np->nfile.fd = digit_val(fd);
10268 goto parseredir_return;
10273 * Parse a substitution. At this point, we have read the dollar sign
10274 * and nothing else.
10282 static const char types[] = "}-+?=";
10286 (c != '(' && c != '{' && !is_name(c) && !is_special(c))
10290 } else if (c == '(') { /* $(command) or $((arith)) */
10291 if (pgetc() == '(') {
10298 USTPUTC(CTLVAR, out);
10299 typeloc = out - stackblock();
10300 USTPUTC(VSNORMAL, out);
10301 subtype = VSNORMAL;
10305 if ((c = pgetc()) == '}')
10308 subtype = VSLENGTH;
10312 if (c > PEOA && is_name(c)) {
10316 } while (c > PEOA && is_in_name(c));
10317 } else if (is_digit(c)) {
10321 } while (is_digit(c));
10322 } else if (is_special(c)) {
10326 badsub:synerror("Bad substitution");
10330 if (subtype == 0) {
10335 /*FALLTHROUGH*/ default:
10336 p = strchr(types, c);
10339 subtype = p - types + VSNORMAL;
10346 subtype = c == '#' ? VSTRIMLEFT : VSTRIMRIGHT;
10358 if (dblquote || arinest)
10360 *(stackblock() + typeloc) = subtype | flags;
10361 if (subtype != VSNORMAL) {
10368 goto parsesub_return;
10373 * Called to parse command substitutions. Newstyle is set if the command
10374 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
10375 * list of commands (passed by reference), and savelen is the number of
10376 * characters on the top of the stack which must be preserved.
10380 struct nodelist **nlpp;
10383 char *volatile str;
10384 struct jmploc jmploc;
10385 struct jmploc *volatile savehandler;
10390 (void) &saveprompt;
10393 savepbq = parsebackquote;
10394 if (setjmp(jmploc.loc)) {
10396 parsebackquote = 0;
10397 handler = savehandler;
10398 longjmp(handler->loc, 1);
10402 savelen = out - stackblock();
10404 str = xmalloc(savelen);
10405 memcpy(str, stackblock(), savelen);
10407 savehandler = handler;
10411 /* We must read until the closing backquote, giving special
10412 treatment to some slashes, and then push the string and
10413 reread it as input, interpreting it normally. */
10420 STARTSTACKSTR(pout);
10426 switch (pc = pgetc()) {
10431 if ((pc = pgetc()) == '\n') {
10438 * If eating a newline, avoid putting
10439 * the newline into the new character
10440 * stream (via the STPUTC after the
10445 if (pc != '\\' && pc != '`' && pc != '$'
10446 && (!dblquote || pc != '"'))
10447 STPUTC('\\', pout);
10454 #ifdef CONFIG_ASH_ALIAS
10457 startlinno = plinno;
10458 synerror("EOF in backquote substitution");
10462 needprompt = doprompt;
10471 STPUTC('\0', pout);
10472 psavelen = pout - stackblock();
10473 if (psavelen > 0) {
10474 pstr = grabstackstr(pout);
10475 setinputstring(pstr);
10480 nlpp = &(*nlpp)->next;
10481 *nlpp = (struct nodelist *) stalloc(sizeof(struct nodelist));
10482 (*nlpp)->next = NULL;
10483 parsebackquote = oldstyle;
10486 saveprompt = doprompt;
10493 doprompt = saveprompt;
10495 if (readtoken() != TRP)
10502 * Start reading from old file again, ignoring any pushed back
10503 * tokens left from the backquote parsing
10508 while (stackblocksize() <= savelen)
10510 STARTSTACKSTR(out);
10512 memcpy(out, str, savelen);
10513 STADJUST(savelen, out);
10519 parsebackquote = savepbq;
10520 handler = savehandler;
10521 if (arinest || dblquote)
10522 USTPUTC(CTLBACKQ | CTLQUOTE, out);
10524 USTPUTC(CTLBACKQ, out);
10526 goto parsebackq_oldreturn;
10528 goto parsebackq_newreturn;
10532 * Parse an arithmetic expansion (indicate start of one and set state)
10536 if (++arinest == 1) {
10537 prevsyntax = syntax;
10538 syntax = ARISYNTAX;
10539 USTPUTC(CTLARI, out);
10546 * we collapse embedded arithmetic expansion to
10547 * parenthesis, which should be equivalent
10551 goto parsearith_return;
10554 } /* end of readtoken */
10558 * Returns true if the text contains nothing to expand (no dollar signs
10562 static int noexpand(char *text)
10568 while ((c = *p++) != '\0') {
10569 if (c == CTLQUOTEMARK)
10573 else if (SIT(c, BASESYNTAX) == CCTL)
10581 * Return true if the argument is a legal variable name (a letter or
10582 * underscore followed by zero or more letters, underscores, and digits).
10585 static int goodname(const char *name)
10593 if (!is_in_name(*p))
10601 * Called when an unexpected token is read during the parse. The argument
10602 * is the token that is expected, or -1 if more than one type of token can
10603 * occur at this point.
10606 static void synexpect(int token)
10611 l = sprintf(msg, "%s unexpected", tokname(lasttoken));
10613 sprintf(msg + l, " (expecting %s)", tokname(token));
10619 static void synerror(const char *msg)
10622 out2fmt("%s: %d: ", commandname, startlinno);
10623 out2fmt("Syntax error: %s\n", msg);
10624 error((char *) NULL);
10630 * called by editline -- any expansions to the prompt
10631 * should be added here.
10633 static void setprompt(int whichprompt)
10637 switch (whichprompt) {
10652 * Code for dealing with input/output redirection.
10655 #define EMPTY -2 /* marks an unused slot in redirtab */
10657 # define PIPESIZE 4096 /* amount of buffering in a pipe */
10659 # define PIPESIZE PIPE_BUF
10664 * Open a file in noclobber mode.
10665 * The code was copied from bash.
10667 static inline int noclobberopen(const char *fname)
10670 struct stat finfo, finfo2;
10673 * If the file exists and is a regular file, return an error
10676 r = stat(fname, &finfo);
10677 if (r == 0 && S_ISREG(finfo.st_mode)) {
10683 * If the file was not present (r != 0), make sure we open it
10684 * exclusively so that if it is created before we open it, our open
10685 * will fail. Make sure that we do not truncate an existing file.
10686 * Note that we don't turn on O_EXCL unless the stat failed -- if the
10687 * file was not a regular file, we leave O_EXCL off.
10690 return open(fname, O_WRONLY | O_CREAT | O_EXCL, 0666);
10691 fd = open(fname, O_WRONLY | O_CREAT, 0666);
10693 /* If the open failed, return the file descriptor right away. */
10698 * OK, the open succeeded, but the file may have been changed from a
10699 * non-regular file to a regular file between the stat and the open.
10700 * We are assuming that the O_EXCL open handles the case where FILENAME
10701 * did not exist and is symlinked to an existing file between the stat
10706 * If we can open it and fstat the file descriptor, and neither check
10707 * revealed that it was a regular file, and the file has not been
10708 * replaced, return the file descriptor.
10710 if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) &&
10711 finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
10714 /* The file has been replaced. badness. */
10721 * Handle here documents. Normally we fork off a process to write the
10722 * data to a pipe. If the document is short, we can stuff the data in
10723 * the pipe without forking.
10726 static inline int openhere(const union node *redir)
10732 error("Pipe call failed");
10733 if (redir->type == NHERE) {
10734 len = strlen(redir->nhere.doc->narg.text);
10735 if (len <= PIPESIZE) {
10736 xwrite(pip[1], redir->nhere.doc->narg.text, len);
10740 if (forkshell((struct job *) NULL, (union node *) NULL, FORK_NOJOB) == 0) {
10742 signal(SIGINT, SIG_IGN);
10743 signal(SIGQUIT, SIG_IGN);
10744 signal(SIGHUP, SIG_IGN);
10746 signal(SIGTSTP, SIG_IGN);
10748 signal(SIGPIPE, SIG_DFL);
10749 if (redir->type == NHERE)
10750 xwrite(pip[1], redir->nhere.doc->narg.text, len);
10752 expandhere(redir->nhere.doc, pip[1]);
10761 static inline int openredirect(const union node *redir)
10766 switch (redir->nfile.type) {
10768 fname = redir->nfile.expfname;
10769 if ((f = open(fname, O_RDONLY)) < 0)
10773 fname = redir->nfile.expfname;
10774 if ((f = open(fname, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0)
10778 /* Take care of noclobber mode. */
10780 fname = redir->nfile.expfname;
10781 if ((f = noclobberopen(fname)) < 0)
10786 fname = redir->nfile.expfname;
10788 if ((f = open(fname, O_WRONLY | O_CREAT | O_TRUNC, 0666)) < 0)
10791 if ((f = creat(fname, 0666)) < 0)
10796 fname = redir->nfile.expfname;
10798 if ((f = open(fname, O_WRONLY | O_CREAT | O_APPEND, 0666)) < 0)
10801 if ((f = open(fname, O_WRONLY)) < 0 && (f = creat(fname, 0666)) < 0)
10803 lseek(f, (off_t) 0, 2);
10810 /* Fall through to eliminate warning. */
10817 f = openhere(redir);
10823 error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
10825 error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
10830 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
10831 * old file descriptors are stashed away so that the redirection can be
10832 * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
10833 * standard output, and the standard error if it becomes a duplicate of
10837 static void redirect(union node *redir, int flags)
10840 struct redirtab *sv = NULL;
10845 int fd1dup = flags & REDIR_BACKQ;; /* stdout `cmd` redir to pipe */
10847 TRACE(("redirect(%s) called\n",
10848 flags & REDIR_PUSH ? "REDIR_PUSH" : "NO_REDIR_PUSH"));
10849 if (flags & REDIR_PUSH) {
10850 sv = xmalloc(sizeof(struct redirtab));
10851 for (i = 0; i < 10; i++)
10852 sv->renamed[i] = EMPTY;
10853 sv->next = redirlist;
10856 for (n = redir; n; n = n->nfile.next) {
10859 if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) &&
10860 n->ndup.dupfd == fd)
10861 continue; /* redirect from/to same file descriptor */
10864 newfd = openredirect(n);
10865 if ((flags & REDIR_PUSH) && sv->renamed[fd] == EMPTY) {
10868 } else if ((i = fcntl(fd, F_DUPFD, 10)) == -1) {
10872 dupredirect(n, newfd, fd1dup);
10882 error("%d: %m", fd);
10888 if (flags & REDIR_PUSH) {
10889 sv->renamed[fd] = i;
10892 } else if (fd != newfd) {
10898 dupredirect(n, newfd, fd1dup);
10904 static void dupredirect(const union node *redir, int f, int fd1dup)
10906 int fd = redir->nfile.fd;
10910 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
10911 if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
10912 if (redir->ndup.dupfd != 1 || fd1dup != 1)
10913 dup_as_newfd(redir->ndup.dupfd, fd);
10919 dup_as_newfd(f, fd);
10928 * Undo the effects of the last redirection.
10931 static void popredir(void)
10933 struct redirtab *rp = redirlist;
10937 for (i = 0; i < 10; i++) {
10938 if (rp->renamed[i] != EMPTY) {
10942 if (rp->renamed[i] >= 0) {
10943 dup_as_newfd(rp->renamed[i], i);
10944 close(rp->renamed[i]);
10948 redirlist = rp->next;
10954 * Discard all saved file descriptors.
10957 static void clearredir(void)
10959 struct redirtab *rp;
10962 for (rp = redirlist; rp; rp = rp->next) {
10963 for (i = 0; i < 10; i++) {
10964 if (rp->renamed[i] >= 0) {
10965 close(rp->renamed[i]);
10967 rp->renamed[i] = EMPTY;
10974 * Copy a file descriptor to be >= to. Returns -1
10975 * if the source file descriptor is closed, EMPTY if there are no unused
10976 * file descriptors left.
10979 static int dup_as_newfd(int from, int to)
10983 newfd = fcntl(from, F_DUPFD, to);
10985 if (errno == EMFILE)
10988 error("%d: %m", from);
10998 static void shtree(union node *, int, char *, FILE *);
10999 static void shcmd(union node *, FILE *);
11000 static void sharg(union node *, FILE *);
11001 static void indent(int, char *, FILE *);
11002 static void trstring(char *);
11006 static void showtree(node * n)
11008 trputs("showtree called\n");
11009 shtree(n, 1, NULL, stdout);
11013 static void shtree(union node *n, int ind, char *pfx, FILE * fp)
11015 struct nodelist *lp;
11021 indent(ind, pfx, fp);
11032 shtree(n->nbinary.ch1, ind, NULL, fp);
11035 shtree(n->nbinary.ch2, ind, NULL, fp);
11043 for (lp = n->npipe.cmdlist; lp; lp = lp->next) {
11048 if (n->npipe.backgnd)
11054 fprintf(fp, "<node type %d>", n->type);
11062 static void shcmd(union node *cmd, FILE * fp)
11070 for (np = cmd->ncmd.args; np; np = np->narg.next) {
11076 for (np = cmd->ncmd.redirect; np; np = np->nfile.next) {
11082 if ((np->nfile.type <= NFROMFD) && (np->nfile.type >= NTO)) {
11083 s = redir_strings[np->nfile.type - NTO];
11089 switch (np->nfile.type) {
11124 if (np->nfile.fd != dftfd)
11125 fprintf(fp, "%d", np->nfile.fd);
11127 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
11128 fprintf(fp, "%d", np->ndup.dupfd);
11130 sharg(np->nfile.fname, fp);
11137 static void sharg(union node *arg, FILE * fp)
11140 struct nodelist *bqlist;
11143 if (arg->type != NARG) {
11144 printf("<node type %d>\n", arg->type);
11148 bqlist = arg->narg.backquote;
11149 for (p = arg->narg.text; *p; p++) {
11158 if (subtype == VSLENGTH)
11164 if (subtype & VSNUL)
11167 switch (subtype & VSTYPE) {
11186 case VSTRIMLEFTMAX:
11193 case VSTRIMRIGHTMAX:
11200 printf("<subtype %d>", subtype);
11207 case CTLBACKQ | CTLQUOTE:
11210 shtree(bqlist->n, -1, NULL, fp);
11221 static void indent(int amount, char *pfx, FILE * fp)
11225 for (i = 0; i < amount; i++) {
11226 if (pfx && i == amount - 1)
11235 static int debug = 1;
11237 static int debug = 0;
11241 static void trputc(int c)
11243 if (tracefile == NULL)
11245 putc(c, tracefile);
11250 static void trace(const char *fmt, ...)
11255 if (tracefile != NULL) {
11256 (void) vfprintf(tracefile, fmt, va);
11257 if (strchr(fmt, '\n'))
11258 (void) fflush(tracefile);
11264 static void trputs(const char *s)
11266 if (tracefile == NULL)
11268 fputs(s, tracefile);
11269 if (strchr(s, '\n'))
11274 static void trstring(char *s)
11279 if (tracefile == NULL)
11281 putc('"', tracefile);
11282 for (p = s; *p; p++) {
11305 case CTLVAR + CTLQUOTE:
11311 case CTLBACKQ + CTLQUOTE:
11314 backslash:putc('\\', tracefile);
11315 putc(c, tracefile);
11318 if (*p >= ' ' && *p <= '~')
11319 putc(*p, tracefile);
11321 putc('\\', tracefile);
11322 putc(*p >> 6 & 03, tracefile);
11323 putc(*p >> 3 & 07, tracefile);
11324 putc(*p & 07, tracefile);
11329 putc('"', tracefile);
11333 static void trargs(char **ap)
11335 if (tracefile == NULL)
11340 putc(' ', tracefile);
11342 putc('\n', tracefile);
11348 static void opentrace()
11358 #ifdef not_this_way
11362 if ((p = getenv("HOME")) == NULL) {
11363 if (geteuid() == 0)
11369 strcat(s, "/trace");
11372 strcpy(s, "./trace");
11373 #endif /* not_this_way */
11374 if ((tracefile = wfopen(s, "a")) == NULL)
11377 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
11378 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
11380 fputs("\nTracing started.\n", tracefile);
11387 * The trap builtin.
11390 static int trapcmd(int argc, char **argv)
11397 for (signo = 0; signo < NSIG; signo++) {
11398 if (trap[signo] != NULL) {
11402 p = single_quote(trap[signo]);
11403 sn = sys_siglist[signo];
11405 sn = u_signal_names(0, &signo, 0);
11408 printf("trap -- %s %s\n", p, sn);
11420 if ((signo = decode_signal(*ap, 0)) < 0)
11421 error("%s: bad trap", *ap);
11424 if (action[0] == '-' && action[1] == '\0')
11427 action = xstrdup(action);
11430 trap[signo] = action;
11441 * Set the signal handler for the specified signal. The routine figures
11442 * out what it should be set to.
11445 static void setsignal(int signo)
11449 struct sigaction act;
11451 if ((t = trap[signo]) == NULL)
11453 else if (*t != '\0')
11457 if (rootshell && action == S_DFL) {
11460 if (iflag || minusc || sflag == 0)
11476 #ifdef CONFIG_ASH_JOB_CONTROL
11486 t = &sigmode[signo - 1];
11489 * current setting unknown
11491 if (sigaction(signo, 0, &act) == -1) {
11493 * Pretend it worked; maybe we should give a warning
11494 * here, but other shells don't. We don't alter
11495 * sigmode, so that we retry every time.
11499 if (act.sa_handler == SIG_IGN) {
11500 if (mflag && (signo == SIGTSTP ||
11501 signo == SIGTTIN || signo == SIGTTOU)) {
11502 *t = S_IGN; /* don't hard ignore these */
11506 *t = S_RESET; /* force to be set */
11509 if (*t == S_HARD_IGN || *t == action)
11511 act.sa_handler = ((action == S_CATCH) ? onsig
11512 : ((action == S_IGN) ? SIG_IGN : SIG_DFL));
11515 sigemptyset(&act.sa_mask);
11516 sigaction(signo, &act, 0);
11523 static void ignoresig(int signo)
11525 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
11526 signal(signo, SIG_IGN);
11528 sigmode[signo - 1] = S_HARD_IGN;
11536 static void onsig(int signo)
11538 if (signo == SIGINT && trap[SIGINT] == NULL) {
11542 gotsig[signo - 1] = 1;
11548 * Called to execute a trap. Perhaps we should avoid entering new trap
11549 * handlers while we are executing a trap handler.
11552 static void dotrap(void)
11558 for (i = 1;; i++) {
11565 savestatus = exitstatus;
11566 evalstring(trap[i], 0);
11567 exitstatus = savestatus;
11574 * Called to exit the shell.
11577 static void exitshell(int status)
11579 struct jmploc loc1, loc2;
11582 TRACE(("exitshell(%d) pid=%d\n", status, getpid()));
11583 if (setjmp(loc1.loc)) {
11586 if (setjmp(loc2.loc)) {
11590 if ((p = trap[0]) != NULL && *p != '\0') {
11594 l1:handler = &loc2; /* probably unnecessary */
11596 #ifdef CONFIG_ASH_JOB_CONTROL
11603 static int decode_signal(const char *string, int minsig)
11606 const char *name = u_signal_names(string, &signo, minsig);
11608 return name ? signo : -1;
11611 static struct var **hashvar(const char *);
11612 static void showvars(const char *, int, int);
11613 static struct var **findvar(struct var **, const char *);
11616 * Initialize the varable symbol tables and import the environment
11620 * This routine initializes the builtin variables. It is called when the
11621 * shell is initialized and again when a shell procedure is spawned.
11624 static void initvar()
11626 const struct varinit *ip;
11630 for (ip = varinit; (vp = ip->var) != NULL; ip++) {
11631 if ((vp->flags & VEXPORT) == 0) {
11632 vpp = hashvar(ip->text);
11635 vp->text = xstrdup(ip->text);
11636 vp->flags = ip->flags;
11637 vp->func = ip->func;
11640 #if !defined(CONFIG_FEATURE_COMMAND_EDITING) || !defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
11642 * PS1 depends on uid
11644 if ((vps1.flags & VEXPORT) == 0) {
11645 vpp = hashvar("PS1=$ ");
11648 vps1.text = xstrdup(geteuid()? "PS1=$ " : "PS1=# ");
11649 vps1.flags = VSTRFIXED | VTEXTFIXED;
11655 * Set the value of a variable. The flags argument is ored with the
11656 * flags of the variable. If val is NULL, the variable is unset.
11659 static void setvar(const char *name, const char *val, int flags)
11674 if (!is_in_name(*p)) {
11675 if (*p == '\0' || *p == '=')
11681 namelen = p - name;
11683 error("%.*s: bad variable name", namelen, name);
11684 len = namelen + 2; /* 2 is space for '=' and '\0' */
11688 len += vallen = strlen(val);
11691 nameeq = xmalloc(len);
11692 memcpy(nameeq, name, namelen);
11693 nameeq[namelen] = '=';
11695 memcpy(nameeq + namelen + 1, val, vallen + 1);
11697 nameeq[namelen + 1] = '\0';
11699 setvareq(nameeq, flags);
11706 * Same as setvar except that the variable and value are passed in
11707 * the first argument as name=value. Since the first argument will
11708 * be actually stored in the table, it should not be a string that
11712 static void setvareq(char *s, int flags)
11714 struct var *vp, **vpp;
11717 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
11718 if ((vp = *findvar(vpp, s))) {
11719 if (vp->flags & VREADONLY) {
11720 size_t len = strchr(s, '=') - s;
11722 error("%.*s: is read only", len, s);
11726 if (vp->func && (flags & VNOFUNC) == 0)
11727 (*vp->func) (strchr(s, '=') + 1);
11729 if ((vp->flags & (VTEXTFIXED | VSTACK)) == 0)
11732 vp->flags &= ~(VTEXTFIXED | VSTACK | VUNSET);
11733 vp->flags |= flags;
11736 #ifdef CONFIG_ASH_MAIL
11738 * We could roll this to a function, to handle it as
11739 * a regular variable function callback, but why bother?
11741 if (iflag && (vp == &vmpath || (vp == &vmail && !mpathset())))
11748 vp = xmalloc(sizeof(*vp));
11759 * Process a linked list of variable assignments.
11762 static void listsetvar(struct strlist *mylist)
11764 struct strlist *lp;
11767 for (lp = mylist; lp; lp = lp->next) {
11768 setvareq(xstrdup(lp->text), 0);
11776 * Find the value of a variable. Returns NULL if not set.
11779 static const char *lookupvar(const char *name)
11783 if ((v = *findvar(hashvar(name), name)) && !(v->flags & VUNSET)) {
11784 return strchr(v->text, '=') + 1;
11792 * Search the environment of a builtin command.
11795 static const char *bltinlookup(const char *name)
11797 const struct strlist *sp;
11799 for (sp = cmdenviron; sp; sp = sp->next) {
11800 if (varequal(sp->text, name))
11801 return strchr(sp->text, '=') + 1;
11803 return lookupvar(name);
11809 * Generate a list of exported variables. This routine is used to construct
11810 * the third argument to execve when executing a program.
11813 static char **environment()
11822 for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) {
11823 for (vp = *vpp; vp; vp = vp->next)
11824 if (vp->flags & VEXPORT)
11827 ep = env = stalloc((nenv + 1) * sizeof *env);
11828 for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) {
11829 for (vp = *vpp; vp; vp = vp->next)
11830 if (vp->flags & VEXPORT)
11839 * Command to list all variables which are set. Currently this command
11840 * is invoked from the set command when the set command is called without
11844 static int showvarscmd(int argc, char **argv)
11846 showvars(nullstr, VUNSET, VUNSET);
11853 * The export and readonly commands.
11856 static int exportcmd(int argc, char **argv)
11861 int flag = argv[0][0] == 'r' ? VREADONLY : VEXPORT;
11864 listsetvar(cmdenviron);
11865 pflag = (nextopt("p") == 'p');
11866 if (argc > 1 && !pflag) {
11867 while ((name = *argptr++) != NULL) {
11868 if ((p = strchr(name, '=')) != NULL) {
11871 if ((vp = *findvar(hashvar(name), name))) {
11876 setvar(name, p, flag);
11880 showvars(argv[0], flag, 0);
11887 * The "local" command.
11890 /* funcnest nonzero if we are currently evaluating a function */
11892 static int localcmd(int argc, char **argv)
11897 error("Not in a function");
11898 while ((name = *argptr++) != NULL) {
11906 * Make a variable a local variable. When a variable is made local, it's
11907 * value and flags are saved in a localvar structure. The saved values
11908 * will be restored when the shell function returns. We handle the name
11909 * "-" as a special case.
11912 static void mklocal(char *name)
11914 struct localvar *lvp;
11919 lvp = xmalloc(sizeof(struct localvar));
11920 if (name[0] == '-' && name[1] == '\0') {
11923 p = xmalloc(sizeof optet_vals);
11924 lvp->text = memcpy(p, optet_vals, sizeof optet_vals);
11927 vpp = hashvar(name);
11928 vp = *findvar(vpp, name);
11930 if (strchr(name, '='))
11931 setvareq(xstrdup(name), VSTRFIXED);
11933 setvar(name, NULL, VSTRFIXED);
11934 vp = *vpp; /* the new variable */
11936 lvp->flags = VUNSET;
11938 lvp->text = vp->text;
11939 lvp->flags = vp->flags;
11940 vp->flags |= VSTRFIXED | VTEXTFIXED;
11941 if (strchr(name, '='))
11942 setvareq(xstrdup(name), 0);
11946 lvp->next = localvars;
11953 * Called after a function returns.
11956 static void poplocalvars()
11958 struct localvar *lvp;
11961 while ((lvp = localvars) != NULL) {
11962 localvars = lvp->next;
11964 if (vp == NULL) { /* $- saved */
11965 memcpy(optet_vals, lvp->text, sizeof optet_vals);
11967 } else if ((lvp->flags & (VUNSET | VSTRFIXED)) == VUNSET) {
11968 (void) unsetvar(vp->text);
11970 if ((vp->flags & VTEXTFIXED) == 0)
11972 vp->flags = lvp->flags;
11973 vp->text = lvp->text;
11980 static int setvarcmd(int argc, char **argv)
11983 return unsetcmd(argc, argv);
11984 else if (argc == 3)
11985 setvar(argv[1], argv[2], 0);
11987 error("List assignment not implemented");
11993 * The unset builtin command. We unset the function before we unset the
11994 * variable to allow a function to be unset when there is a readonly variable
11995 * with the same name.
11998 static int unsetcmd(int argc, char **argv)
12006 while ((i = nextopt("vf")) != '\0') {
12012 if (flg_func == 0 && flg_var == 0)
12015 for (ap = argptr; *ap; ap++) {
12019 ret |= unsetvar(*ap);
12026 * Unset the specified variable.
12029 static int unsetvar(const char *s)
12034 vpp = findvar(hashvar(s), s);
12037 if (vp->flags & VREADONLY)
12040 if (*(strchr(vp->text, '=') + 1) != '\0')
12041 setvar(s, nullstr, 0);
12042 vp->flags &= ~VEXPORT;
12043 vp->flags |= VUNSET;
12044 if ((vp->flags & VSTRFIXED) == 0) {
12045 if ((vp->flags & VTEXTFIXED) == 0)
12060 * Find the appropriate entry in the hash table from the name.
12063 static struct var **hashvar(const char *p)
12065 unsigned int hashval;
12067 hashval = ((unsigned char) *p) << 4;
12068 while (*p && *p != '=')
12069 hashval += (unsigned char) *p++;
12070 return &vartab[hashval % VTABSIZE];
12076 * Returns true if the two strings specify the same varable. The first
12077 * variable name is terminated by '='; the second may be terminated by
12078 * either '=' or '\0'.
12081 static int varequal(const char *p, const char *q)
12083 while (*p == *q++) {
12087 if (*p == '=' && *(q - 1) == '\0')
12092 static void showvars(const char *myprefix, int mask, int xor)
12096 const char *sep = myprefix == nullstr ? myprefix : spcstr;
12098 for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) {
12099 for (vp = *vpp; vp; vp = vp->next) {
12100 if ((vp->flags & mask) ^ xor) {
12104 p = strchr(vp->text, '=') + 1;
12105 len = p - vp->text;
12106 p = single_quote(p);
12108 printf("%s%s%.*s%s\n", myprefix, sep, len, vp->text, p);
12115 static struct var **findvar(struct var **vpp, const char *name)
12117 for (; *vpp; vpp = &(*vpp)->next) {
12118 if (varequal((*vpp)->text, name)) {
12126 * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
12127 * This file contains code for the times builtin.
12129 static int timescmd(int argc, char **argv)
12132 long int clk_tck = sysconf(_SC_CLK_TCK);
12135 printf("%dm%fs %dm%fs\n%dm%fs %dm%fs\n",
12136 (int) (buf.tms_utime / clk_tck / 60),
12137 ((double) buf.tms_utime) / clk_tck,
12138 (int) (buf.tms_stime / clk_tck / 60),
12139 ((double) buf.tms_stime) / clk_tck,
12140 (int) (buf.tms_cutime / clk_tck / 60),
12141 ((double) buf.tms_cutime) / clk_tck,
12142 (int) (buf.tms_cstime / clk_tck / 60),
12143 ((double) buf.tms_cstime) / clk_tck);
12147 #ifdef CONFIG_ASH_MATH_SUPPORT
12148 /* The let builtin. */
12149 int letcmd(int argc, char **argv)
12155 char *tmp, *expression, p[13];
12157 expression = strchr(argv[1], '=');
12159 /* Cannot use 'error()' here, or the return code
12160 * will be incorrect */
12161 out2fmt("sh: let: syntax error: \"%s\"\n", argv[1]);
12164 *expression = '\0';
12165 tmp = ++expression;
12166 result = arith(tmp, &errcode);
12168 /* Cannot use 'error()' here, or the return code
12169 * will be incorrect */
12170 out2fmt("sh: let: ");
12172 out2fmt("divide by zero");
12174 out2fmt("syntax error: \"%s=%s\"\n", argv[1], expression);
12177 snprintf(p, 12, "%ld", result);
12178 setvar(argv[1], xstrdup(p), 0);
12179 } else if (argc >= 3)
12180 synerror("invalid operand");
12188 * Copyright (c) 1989, 1991, 1993, 1994
12189 * The Regents of the University of California. All rights reserved.
12191 * This code is derived from software contributed to Berkeley by
12192 * Kenneth Almquist.
12194 * Redistribution and use in source and binary forms, with or without
12195 * modification, are permitted provided that the following conditions
12197 * 1. Redistributions of source code must retain the above copyright
12198 * notice, this list of conditions and the following disclaimer.
12199 * 2. Redistributions in binary form must reproduce the above copyright
12200 * notice, this list of conditions and the following disclaimer in the
12201 * documentation and/or other materials provided with the distribution.
12203 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
12204 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
12206 * 4. Neither the name of the University nor the names of its contributors
12207 * may be used to endorse or promote products derived from this software
12208 * without specific prior written permission.
12210 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
12211 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
12212 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
12213 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
12214 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
12215 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
12216 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
12217 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
12218 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
12219 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF