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 * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
9 * was re-ported from NetBSD and debianized.
12 * This code is derived from software contributed to Berkeley by
15 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
17 * Original BSD copyright notice is retained at the end of this file.
21 * rewrite arith.y to micro stack based cryptic algorithm by
22 * Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
24 * Modified by Paul Mundt <lethal@linux-sh.org> (c) 2004 to support
27 * Modified by Vladimir Oleynik <dzo@simtreas.ru> (c) 2001-2005 to be
28 * used in busybox and size optimizations,
29 * rewrote arith (see notes to this), added locale support,
30 * rewrote dynamic variables.
36 * The follow should be set to reflect the type of system you have:
37 * JOBS -> 1 if you have Berkeley job control, 0 otherwise.
38 * define SYSV if you are running under System V.
39 * define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
40 * define DEBUG=2 to compile in and turn on debugging.
42 * When debugging is on, debugging info will be written to ./trace and
43 * a quit signal will generate a core dump.
57 #include <sys/types.h>
58 #include <sys/ioctl.h>
59 #include <sys/param.h>
60 #include <sys/resource.h>
80 /*#include <stdint.h>*/
86 #ifdef CONFIG_ASH_JOB_CONTROL
92 #if JOBS || defined(CONFIG_ASH_READ_NCHARS)
100 static int *dash_errno;
102 #define errno (*dash_errno)
105 #if defined(__uClinux__)
106 #error "Do not even bother, ash will not run on uClinux"
110 #define _DIAGASSERT(assert_expr) assert(assert_expr)
112 #define _DIAGASSERT(assert_expr)
116 #ifdef CONFIG_ASH_ALIAS
129 static struct alias *lookupalias(const char *, int);
130 static int aliascmd(int, char **);
131 static int unaliascmd(int, char **);
132 static void rmaliases(void);
133 static int unalias(const char *);
134 static void printalias(const struct alias *);
140 static void setpwd(const char *, int);
146 * Types of operations (passed to the errmsg routine).
150 static const char not_found_msg[] = "%s: not found";
153 #define E_OPEN "No such file" /* opening a file */
154 #define E_CREAT "Directory nonexistent" /* creating a file */
155 #define E_EXEC not_found_msg+4 /* executing a program */
158 * We enclose jmp_buf in a structure so that we can declare pointers to
159 * jump locations. The global variable handler contains the location to
160 * jump to when an exception occurs, and the global variable exception
161 * contains a code identifying the exception. To implement nested
162 * exception handlers, the user should save the value of handler on entry
163 * to an inner scope, set handler to point to a jmploc structure for the
164 * inner scope, and restore handler on exit from the scope.
171 static struct jmploc *handler;
172 static int exception;
173 static volatile int suppressint;
174 static volatile sig_atomic_t intpending;
177 #define EXINT 0 /* SIGINT received */
178 #define EXERROR 1 /* a generic error */
179 #define EXSHELLPROC 2 /* execute a shell procedure */
180 #define EXEXEC 3 /* command execution failed */
181 #define EXEXIT 4 /* exit the shell */
182 #define EXSIG 5 /* trapped signal in wait(1) */
185 /* do we generate EXSIG events */
187 /* last pending signal */
188 static volatile sig_atomic_t pendingsigs;
191 * These macros allow the user to suspend the handling of interrupt signals
192 * over a period of time. This is similar to SIGHOLD to or sigblock, but
193 * much more efficient and portable. (But hacking the kernel is so much
194 * more fun than worrying about efficiency and portability. :-))
197 #define xbarrier() ({ __asm__ __volatile__ ("": : :"memory"); })
204 #define SAVEINT(v) ((v) = suppressint)
205 #define RESTOREINT(v) \
208 if ((suppressint = (v)) == 0 && intpending) onint(); \
219 /* EXSIG is turned off by evalbltin(). */
222 static void exraise(int) ATTRIBUTE_NORETURN;
223 static void onint(void) ATTRIBUTE_NORETURN;
225 static void sh_error(const char *, ...) ATTRIBUTE_NORETURN;
226 static void exerror(int, const char *, ...) ATTRIBUTE_NORETURN;
228 static void sh_warnx(const char *, ...);
230 #ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
233 if (--suppressint == 0 && intpending) {
237 #define INTON inton()
238 static void forceinton(void)
244 #define FORCEINTON forceinton()
249 if (--suppressint == 0 && intpending) onint(); \
256 if (intpending) onint(); \
259 #endif /* CONFIG_ASH_OPTIMIZE_FOR_SIZE */
264 struct strlist *next;
270 struct strlist *list;
271 struct strlist **lastp;
277 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
278 #define EXP_TILDE 0x2 /* do normal tilde expansion */
279 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
280 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
281 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
282 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
283 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
284 #define EXP_WORD 0x80 /* expand word in parameter expansion */
285 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
289 static void expandarg(union node *, struct arglist *, int);
290 #define rmescapes(p) _rmescapes((p), 0)
291 static char *_rmescapes(char *, int);
292 static int casematch(union node *, char *);
294 #ifdef CONFIG_ASH_MATH_SUPPORT
295 static void expari(int);
300 static char *commandname; /* currently executing command */
301 static struct strlist *cmdenviron; /* environment for builtin command */
302 static int exitstatus; /* exit status of last command */
303 static int back_exitstatus; /* exit status of backquoted command */
306 struct backcmd { /* result of evalbackcmd */
307 int fd; /* file descriptor to read from */
308 char *buf; /* buffer */
309 int nleft; /* number of chars in buffer */
310 struct job *jp; /* job structure for command */
314 * This file was generated by the mknodes program.
350 union node *redirect;
357 struct nodelist *cmdlist;
364 union node *redirect;
379 union node *elsepart;
410 struct nodelist *backquote;
450 struct nredir nredir;
451 struct nbinary nbinary;
455 struct nclist nclist;
465 struct nodelist *next;
476 static void freefunc(struct funcnode *);
479 /* control characters in argument strings */
480 #define CTL_FIRST '\201' /* first 'special' character */
481 #define CTLESC '\201' /* escape next character */
482 #define CTLVAR '\202' /* variable defn */
483 #define CTLENDVAR '\203'
484 #define CTLBACKQ '\204'
485 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
486 /* CTLBACKQ | CTLQUOTE == '\205' */
487 #define CTLARI '\206' /* arithmetic expression */
488 #define CTLENDARI '\207'
489 #define CTLQUOTEMARK '\210'
490 #define CTL_LAST '\210' /* last 'special' character */
492 /* variable substitution byte (follows CTLVAR) */
493 #define VSTYPE 0x0f /* type of variable substitution */
494 #define VSNUL 0x10 /* colon--treat the empty string as unset */
495 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
497 /* values of VSTYPE field */
498 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
499 #define VSMINUS 0x2 /* ${var-text} */
500 #define VSPLUS 0x3 /* ${var+text} */
501 #define VSQUESTION 0x4 /* ${var?message} */
502 #define VSASSIGN 0x5 /* ${var=text} */
503 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
504 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
505 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
506 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
507 #define VSLENGTH 0xa /* ${#var} */
509 /* values of checkkwd variable */
514 #define IBUFSIZ (BUFSIZ + 1)
517 * NEOF is returned by parsecmd when it encounters an end of file. It
518 * must be distinct from NULL, so we use the address of a variable that
519 * happens to be handy.
521 static int plinno = 1; /* input line number */
523 /* number of characters left in input buffer */
524 static int parsenleft; /* copy of parsefile->nleft */
525 static int parselleft; /* copy of parsefile->lleft */
527 /* next character in input buffer */
528 static char *parsenextc; /* copy of parsefile->nextc */
531 struct strpush *prev; /* preceding string on stack */
534 #ifdef CONFIG_ASH_ALIAS
535 struct alias *ap; /* if push was associated with an alias */
537 char *string; /* remember the string since it may change */
541 struct parsefile *prev; /* preceding file on stack */
542 int linno; /* current line */
543 int fd; /* file descriptor (or -1 if string) */
544 int nleft; /* number of chars left in this line */
545 int lleft; /* number of chars left in this buffer */
546 char *nextc; /* next char in buffer */
547 char *buf; /* input buffer */
548 struct strpush *strpush; /* for pushing strings at this level */
549 struct strpush basestrpush; /* so pushing one is fast */
552 static struct parsefile basepf; /* top level input file */
553 #define basebuf bb_common_bufsiz1 /* buffer for top level input file */
554 static struct parsefile *parsefile = &basepf; /* current input file */
557 static int tokpushback; /* last token pushed back */
558 #define NEOF ((union node *)&tokpushback)
559 static int parsebackquote; /* nonzero if we are inside backquotes */
560 static int doprompt; /* if set, prompt the user */
561 static int needprompt; /* true if interactive and at start of line */
562 static int lasttoken; /* last token read */
563 static char *wordtext; /* text of last word returned by readtoken */
565 static struct nodelist *backquotelist;
566 static union node *redirnode;
567 static struct heredoc *heredoc;
568 static int quoteflag; /* set if (part of) last token was quoted */
569 static int startlinno; /* line # where last token started */
571 static union node *parsecmd(int);
572 static void fixredir(union node *, const char *, int);
573 static const char *const *findkwd(const char *);
574 static char *endofname(const char *);
578 typedef void *pointer;
580 static char nullstr[1]; /* zero length string */
581 static const char spcstr[] = " ";
582 static const char snlfmt[] = "%s\n";
583 static const char dolatstr[] = { CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' };
584 static const char illnum[] = "Illegal number: %s";
585 static const char homestr[] = "HOME";
588 #define TRACE(param) trace param
589 #define TRACEV(param) tracev param
592 #define TRACEV(param)
595 #if !defined(__GNUC__) || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
596 #define __builtin_expect(x, expected_value) (x)
599 #define xlikely(x) __builtin_expect((x),1)
614 #define TENDBQUOTE 12
632 /* first char is indicating which tokens mark the end of a list */
633 static const char *const tokname_array[] = {
648 /* the following are keywords */
667 static const char *tokname(int tok)
673 sprintf(buf + (tok >= TSEMI), "%s%c",
674 tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0));
681 * Most machines require the value returned from malloc to be aligned
682 * in some way. The following macro will get this right on many machines.
685 #define SHELL_SIZE (sizeof(union {int i; char *cp; double d; }) - 1)
687 * It appears that grabstackstr() will barf with such alignments
688 * because stalloc() will return a string allocated in a new stackblock.
690 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
693 * This file was generated by the mksyntax program.
698 #define CWORD 0 /* character is nothing special */
699 #define CNL 1 /* newline character */
700 #define CBACK 2 /* a backslash character */
701 #define CSQUOTE 3 /* single quote */
702 #define CDQUOTE 4 /* double quote */
703 #define CENDQUOTE 5 /* a terminating quote */
704 #define CBQUOTE 6 /* backwards single quote */
705 #define CVAR 7 /* a dollar sign */
706 #define CENDVAR 8 /* a '}' character */
707 #define CLP 9 /* a left paren in arithmetic */
708 #define CRP 10 /* a right paren in arithmetic */
709 #define CENDFILE 11 /* end of file */
710 #define CCTL 12 /* like CWORD, except it must be escaped */
711 #define CSPCL 13 /* these terminate a word */
712 #define CIGN 14 /* character should be ignored */
714 #ifdef CONFIG_ASH_ALIAS
718 #define PEOA_OR_PEOF PEOA
722 #define PEOA_OR_PEOF PEOF
725 #define is_digit(c) ((unsigned)((c) - '0') <= 9)
726 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
727 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
729 /* C99 say: "char" declaration may be signed or unsigned default */
730 #define SC2INT(chr2may_be_negative_int) (int)((signed char)chr2may_be_negative_int)
733 * is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
734 * (assuming ascii char codes, as the original implementation did)
736 #define is_special(c) \
737 ( (((unsigned int)c) - 33 < 32) \
738 && ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1))
740 #define digit_val(c) ((c) - '0')
743 * This file was generated by the mksyntax program.
746 #ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
747 #define USE_SIT_FUNCTION
750 /* number syntax index */
751 #define BASESYNTAX 0 /* not in quotes */
752 #define DQSYNTAX 1 /* in double quotes */
753 #define SQSYNTAX 2 /* in single quotes */
754 #define ARISYNTAX 3 /* in arithmetic */
756 #ifdef CONFIG_ASH_MATH_SUPPORT
757 static const char S_I_T[][4] = {
758 #ifdef CONFIG_ASH_ALIAS
759 {CSPCL, CIGN, CIGN, CIGN}, /* 0, PEOA */
761 {CSPCL, CWORD, CWORD, CWORD}, /* 1, ' ' */
762 {CNL, CNL, CNL, CNL}, /* 2, \n */
763 {CWORD, CCTL, CCTL, CWORD}, /* 3, !*-/:=?[]~ */
764 {CDQUOTE, CENDQUOTE, CWORD, CWORD}, /* 4, '"' */
765 {CVAR, CVAR, CWORD, CVAR}, /* 5, $ */
766 {CSQUOTE, CWORD, CENDQUOTE, CWORD}, /* 6, "'" */
767 {CSPCL, CWORD, CWORD, CLP}, /* 7, ( */
768 {CSPCL, CWORD, CWORD, CRP}, /* 8, ) */
769 {CBACK, CBACK, CCTL, CBACK}, /* 9, \ */
770 {CBQUOTE, CBQUOTE, CWORD, CBQUOTE}, /* 10, ` */
771 {CENDVAR, CENDVAR, CWORD, CENDVAR}, /* 11, } */
772 #ifndef USE_SIT_FUNCTION
773 {CENDFILE, CENDFILE, CENDFILE, CENDFILE}, /* 12, PEOF */
774 {CWORD, CWORD, CWORD, CWORD}, /* 13, 0-9A-Za-z */
775 {CCTL, CCTL, CCTL, CCTL} /* 14, CTLESC ... */
779 static const char S_I_T[][3] = {
780 #ifdef CONFIG_ASH_ALIAS
781 {CSPCL, CIGN, CIGN}, /* 0, PEOA */
783 {CSPCL, CWORD, CWORD}, /* 1, ' ' */
784 {CNL, CNL, CNL}, /* 2, \n */
785 {CWORD, CCTL, CCTL}, /* 3, !*-/:=?[]~ */
786 {CDQUOTE, CENDQUOTE, CWORD}, /* 4, '"' */
787 {CVAR, CVAR, CWORD}, /* 5, $ */
788 {CSQUOTE, CWORD, CENDQUOTE}, /* 6, "'" */
789 {CSPCL, CWORD, CWORD}, /* 7, ( */
790 {CSPCL, CWORD, CWORD}, /* 8, ) */
791 {CBACK, CBACK, CCTL}, /* 9, \ */
792 {CBQUOTE, CBQUOTE, CWORD}, /* 10, ` */
793 {CENDVAR, CENDVAR, CWORD}, /* 11, } */
794 #ifndef USE_SIT_FUNCTION
795 {CENDFILE, CENDFILE, CENDFILE}, /* 12, PEOF */
796 {CWORD, CWORD, CWORD}, /* 13, 0-9A-Za-z */
797 {CCTL, CCTL, CCTL} /* 14, CTLESC ... */
800 #endif /* CONFIG_ASH_MATH_SUPPORT */
802 #ifdef USE_SIT_FUNCTION
804 #define U_C(c) ((unsigned char)(c))
806 static int SIT(int c, int syntax)
808 static const char spec_symbls[] = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
809 #ifdef CONFIG_ASH_ALIAS
810 static const char syntax_index_table[] = {
811 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
812 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
813 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
817 static const char syntax_index_table[] = {
818 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
819 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
820 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
827 if (c == PEOF) /* 2^8+2 */
829 #ifdef CONFIG_ASH_ALIAS
830 if (c == PEOA) /* 2^8+1 */
834 if (U_C(c) >= U_C(CTLESC) && U_C(c) <= U_C(CTLQUOTEMARK))
837 s = strchr(spec_symbls, c);
838 if (s == 0 || *s == 0)
840 indx = syntax_index_table[(s - spec_symbls)];
842 return S_I_T[indx][syntax];
845 #else /* USE_SIT_FUNCTION */
847 #define SIT(c, syntax) S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax]
849 #ifdef CONFIG_ASH_ALIAS
850 #define CSPCL_CIGN_CIGN_CIGN 0
851 #define CSPCL_CWORD_CWORD_CWORD 1
852 #define CNL_CNL_CNL_CNL 2
853 #define CWORD_CCTL_CCTL_CWORD 3
854 #define CDQUOTE_CENDQUOTE_CWORD_CWORD 4
855 #define CVAR_CVAR_CWORD_CVAR 5
856 #define CSQUOTE_CWORD_CENDQUOTE_CWORD 6
857 #define CSPCL_CWORD_CWORD_CLP 7
858 #define CSPCL_CWORD_CWORD_CRP 8
859 #define CBACK_CBACK_CCTL_CBACK 9
860 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
861 #define CENDVAR_CENDVAR_CWORD_CENDVAR 11
862 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
863 #define CWORD_CWORD_CWORD_CWORD 13
864 #define CCTL_CCTL_CCTL_CCTL 14
866 #define CSPCL_CWORD_CWORD_CWORD 0
867 #define CNL_CNL_CNL_CNL 1
868 #define CWORD_CCTL_CCTL_CWORD 2
869 #define CDQUOTE_CENDQUOTE_CWORD_CWORD 3
870 #define CVAR_CVAR_CWORD_CVAR 4
871 #define CSQUOTE_CWORD_CENDQUOTE_CWORD 5
872 #define CSPCL_CWORD_CWORD_CLP 6
873 #define CSPCL_CWORD_CWORD_CRP 7
874 #define CBACK_CBACK_CCTL_CBACK 8
875 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 9
876 #define CENDVAR_CENDVAR_CWORD_CENDVAR 10
877 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 11
878 #define CWORD_CWORD_CWORD_CWORD 12
879 #define CCTL_CCTL_CCTL_CCTL 13
882 static const char syntax_index_table[258] = {
883 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
884 /* 0 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
885 #ifdef CONFIG_ASH_ALIAS
886 /* 1 PEOA */ CSPCL_CIGN_CIGN_CIGN,
888 /* 2 -128 0x80 */ CWORD_CWORD_CWORD_CWORD,
889 /* 3 -127 CTLESC */ CCTL_CCTL_CCTL_CCTL,
890 /* 4 -126 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
891 /* 5 -125 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
892 /* 6 -124 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
893 /* 7 -123 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
894 /* 8 -122 CTLARI */ CCTL_CCTL_CCTL_CCTL,
895 /* 9 -121 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
896 /* 10 -120 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
897 /* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
898 /* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
899 /* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
900 /* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
901 /* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
902 /* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
903 /* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
904 /* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
905 /* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
906 /* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
907 /* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
908 /* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
909 /* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
910 /* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
911 /* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
912 /* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
913 /* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
914 /* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
915 /* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
916 /* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
917 /* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
918 /* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
919 /* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
920 /* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
921 /* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
922 /* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
923 /* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
924 /* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
925 /* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
926 /* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
927 /* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
928 /* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
929 /* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
930 /* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
931 /* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
932 /* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
933 /* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
934 /* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
935 /* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
936 /* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
937 /* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
938 /* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
939 /* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
940 /* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
941 /* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
942 /* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
943 /* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
944 /* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
945 /* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
946 /* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
947 /* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
948 /* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
949 /* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
950 /* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
951 /* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
952 /* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
953 /* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
954 /* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
955 /* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
956 /* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
957 /* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
958 /* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
959 /* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
960 /* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
961 /* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
962 /* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
963 /* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
964 /* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
965 /* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
966 /* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
967 /* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
968 /* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
969 /* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
970 /* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
971 /* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
972 /* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
973 /* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
974 /* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
975 /* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
976 /* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
977 /* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
978 /* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
979 /* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
980 /* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
981 /* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
982 /* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
983 /* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
984 /* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
985 /* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
986 /* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
987 /* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
988 /* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
989 /* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
990 /* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
991 /* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
992 /* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
993 /* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
994 /* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
995 /* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
996 /* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
997 /* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
998 /* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
999 /* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
1000 /* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
1001 /* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
1002 /* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
1003 /* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
1004 /* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
1005 /* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
1006 /* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
1007 /* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
1008 /* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
1009 /* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
1010 /* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
1011 /* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
1012 /* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
1013 /* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
1014 /* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
1015 /* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
1016 /* 130 0 */ CWORD_CWORD_CWORD_CWORD,
1017 /* 131 1 */ CWORD_CWORD_CWORD_CWORD,
1018 /* 132 2 */ CWORD_CWORD_CWORD_CWORD,
1019 /* 133 3 */ CWORD_CWORD_CWORD_CWORD,
1020 /* 134 4 */ CWORD_CWORD_CWORD_CWORD,
1021 /* 135 5 */ CWORD_CWORD_CWORD_CWORD,
1022 /* 136 6 */ CWORD_CWORD_CWORD_CWORD,
1023 /* 137 7 */ CWORD_CWORD_CWORD_CWORD,
1024 /* 138 8 */ CWORD_CWORD_CWORD_CWORD,
1025 /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
1026 /* 140 10 "\n" */ CNL_CNL_CNL_CNL,
1027 /* 141 11 */ CWORD_CWORD_CWORD_CWORD,
1028 /* 142 12 */ CWORD_CWORD_CWORD_CWORD,
1029 /* 143 13 */ CWORD_CWORD_CWORD_CWORD,
1030 /* 144 14 */ CWORD_CWORD_CWORD_CWORD,
1031 /* 145 15 */ CWORD_CWORD_CWORD_CWORD,
1032 /* 146 16 */ CWORD_CWORD_CWORD_CWORD,
1033 /* 147 17 */ CWORD_CWORD_CWORD_CWORD,
1034 /* 148 18 */ CWORD_CWORD_CWORD_CWORD,
1035 /* 149 19 */ CWORD_CWORD_CWORD_CWORD,
1036 /* 150 20 */ CWORD_CWORD_CWORD_CWORD,
1037 /* 151 21 */ CWORD_CWORD_CWORD_CWORD,
1038 /* 152 22 */ CWORD_CWORD_CWORD_CWORD,
1039 /* 153 23 */ CWORD_CWORD_CWORD_CWORD,
1040 /* 154 24 */ CWORD_CWORD_CWORD_CWORD,
1041 /* 155 25 */ CWORD_CWORD_CWORD_CWORD,
1042 /* 156 26 */ CWORD_CWORD_CWORD_CWORD,
1043 /* 157 27 */ CWORD_CWORD_CWORD_CWORD,
1044 /* 158 28 */ CWORD_CWORD_CWORD_CWORD,
1045 /* 159 29 */ CWORD_CWORD_CWORD_CWORD,
1046 /* 160 30 */ CWORD_CWORD_CWORD_CWORD,
1047 /* 161 31 */ CWORD_CWORD_CWORD_CWORD,
1048 /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
1049 /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
1050 /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
1051 /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
1052 /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
1053 /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
1054 /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
1055 /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
1056 /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
1057 /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
1058 /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
1059 /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
1060 /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
1061 /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
1062 /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
1063 /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
1064 /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
1065 /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
1066 /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
1067 /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
1068 /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
1069 /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
1070 /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
1071 /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
1072 /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
1073 /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
1074 /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
1075 /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
1076 /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
1077 /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
1078 /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
1079 /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
1080 /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
1081 /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
1082 /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
1083 /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
1084 /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
1085 /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
1086 /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
1087 /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
1088 /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
1089 /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
1090 /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
1091 /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
1092 /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
1093 /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
1094 /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
1095 /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
1096 /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
1097 /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
1098 /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
1099 /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
1100 /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
1101 /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
1102 /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
1103 /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
1104 /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
1105 /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
1106 /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
1107 /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
1108 /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
1109 /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
1110 /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
1111 /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
1112 /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
1113 /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
1114 /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
1115 /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
1116 /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
1117 /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
1118 /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
1119 /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
1120 /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
1121 /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
1122 /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
1123 /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
1124 /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
1125 /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
1126 /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
1127 /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
1128 /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
1129 /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
1130 /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
1131 /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
1132 /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
1133 /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
1134 /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
1135 /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
1136 /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
1137 /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
1138 /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
1139 /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
1140 /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
1141 /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
1142 /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
1143 /* 257 127 */ CWORD_CWORD_CWORD_CWORD,
1146 #endif /* USE_SIT_FUNCTION */
1153 static int funcblocksize; /* size of structures in function */
1154 static int funcstringsize; /* size of strings in node */
1155 static pointer funcblock; /* block to allocate function from */
1156 static char *funcstring; /* block to allocate strings from */
1158 static const short nodesize[26] = {
1159 SHELL_ALIGN(sizeof (struct ncmd)),
1160 SHELL_ALIGN(sizeof (struct npipe)),
1161 SHELL_ALIGN(sizeof (struct nredir)),
1162 SHELL_ALIGN(sizeof (struct nredir)),
1163 SHELL_ALIGN(sizeof (struct nredir)),
1164 SHELL_ALIGN(sizeof (struct nbinary)),
1165 SHELL_ALIGN(sizeof (struct nbinary)),
1166 SHELL_ALIGN(sizeof (struct nbinary)),
1167 SHELL_ALIGN(sizeof (struct nif)),
1168 SHELL_ALIGN(sizeof (struct nbinary)),
1169 SHELL_ALIGN(sizeof (struct nbinary)),
1170 SHELL_ALIGN(sizeof (struct nfor)),
1171 SHELL_ALIGN(sizeof (struct ncase)),
1172 SHELL_ALIGN(sizeof (struct nclist)),
1173 SHELL_ALIGN(sizeof (struct narg)),
1174 SHELL_ALIGN(sizeof (struct narg)),
1175 SHELL_ALIGN(sizeof (struct nfile)),
1176 SHELL_ALIGN(sizeof (struct nfile)),
1177 SHELL_ALIGN(sizeof (struct nfile)),
1178 SHELL_ALIGN(sizeof (struct nfile)),
1179 SHELL_ALIGN(sizeof (struct nfile)),
1180 SHELL_ALIGN(sizeof (struct ndup)),
1181 SHELL_ALIGN(sizeof (struct ndup)),
1182 SHELL_ALIGN(sizeof (struct nhere)),
1183 SHELL_ALIGN(sizeof (struct nhere)),
1184 SHELL_ALIGN(sizeof (struct nnot)),
1188 static void calcsize(union node *);
1189 static void sizenodelist(struct nodelist *);
1190 static union node *copynode(union node *);
1191 static struct nodelist *copynodelist(struct nodelist *);
1192 static char *nodesavestr(char *);
1195 static int evalstring(char *, int mask);
1196 union node; /* BLETCH for ansi C */
1197 static void evaltree(union node *, int);
1198 static void evalbackcmd(union node *, struct backcmd *);
1200 static int evalskip; /* set if we are skipping commands */
1201 static int skipcount; /* number of levels to skip */
1202 static int funcnest; /* depth of function calls */
1204 /* reasons for skipping commands (see comment on breakcmd routine) */
1205 #define SKIPBREAK (1 << 0)
1206 #define SKIPCONT (1 << 1)
1207 #define SKIPFUNC (1 << 2)
1208 #define SKIPFILE (1 << 3)
1209 #define SKIPEVAL (1 << 4)
1212 * This file was generated by the mkbuiltins program.
1216 static int bgcmd(int, char **);
1218 static int breakcmd(int, char **);
1219 static int cdcmd(int, char **);
1220 #ifdef CONFIG_ASH_CMDCMD
1221 static int commandcmd(int, char **);
1223 static int dotcmd(int, char **);
1224 static int evalcmd(int, char **);
1225 #ifdef CONFIG_ASH_BUILTIN_ECHO
1226 static int echocmd(int, char **);
1228 #ifdef CONFIG_ASH_BUILTIN_TEST
1229 static int testcmd(int, char **);
1231 static int execcmd(int, char **);
1232 static int exitcmd(int, char **);
1233 static int exportcmd(int, char **);
1234 static int falsecmd(int, char **);
1236 static int fgcmd(int, char **);
1238 #ifdef CONFIG_ASH_GETOPTS
1239 static int getoptscmd(int, char **);
1241 static int hashcmd(int, char **);
1242 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
1243 static int helpcmd(int argc, char **argv);
1246 static int jobscmd(int, char **);
1248 #ifdef CONFIG_ASH_MATH_SUPPORT
1249 static int letcmd(int, char **);
1251 static int localcmd(int, char **);
1252 static int pwdcmd(int, char **);
1253 static int readcmd(int, char **);
1254 static int returncmd(int, char **);
1255 static int setcmd(int, char **);
1256 static int shiftcmd(int, char **);
1257 static int timescmd(int, char **);
1258 static int trapcmd(int, char **);
1259 static int truecmd(int, char **);
1260 static int typecmd(int, char **);
1261 static int umaskcmd(int, char **);
1262 static int unsetcmd(int, char **);
1263 static int waitcmd(int, char **);
1264 static int ulimitcmd(int, char **);
1266 static int killcmd(int, char **);
1271 #ifdef CONFIG_ASH_MAIL
1272 static void chkmail(void);
1273 static void changemail(const char *);
1278 /* values of cmdtype */
1279 #define CMDUNKNOWN -1 /* no entry in table for command */
1280 #define CMDNORMAL 0 /* command is an executable program */
1281 #define CMDFUNCTION 1 /* command is a shell function */
1282 #define CMDBUILTIN 2 /* command is a shell builtin */
1286 int (*builtin)(int, char **);
1287 /* unsigned flags; */
1291 #define COMMANDCMD (builtincmd + 5 + \
1292 2 * ENABLE_ASH_BUILTIN_TEST + \
1293 ENABLE_ASH_ALIAS + \
1294 ENABLE_ASH_JOB_CONTROL)
1295 #define EXECCMD (builtincmd + 7 + \
1296 2 * ENABLE_ASH_BUILTIN_TEST + \
1297 ENABLE_ASH_ALIAS + \
1298 ENABLE_ASH_JOB_CONTROL + \
1299 ENABLE_ASH_CMDCMD + \
1300 ENABLE_ASH_BUILTIN_ECHO)
1302 #define BUILTIN_NOSPEC "0"
1303 #define BUILTIN_SPECIAL "1"
1304 #define BUILTIN_REGULAR "2"
1305 #define BUILTIN_SPEC_REG "3"
1306 #define BUILTIN_ASSIGN "4"
1307 #define BUILTIN_SPEC_ASSG "5"
1308 #define BUILTIN_REG_ASSG "6"
1309 #define BUILTIN_SPEC_REG_ASSG "7"
1311 #define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1)
1312 #define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2)
1313 #define IS_BUILTIN_ASSIGN(builtincmd) ((builtincmd)->name[0] & 4)
1315 static const struct builtincmd builtincmd[] = {
1316 { BUILTIN_SPEC_REG ".", dotcmd },
1317 { BUILTIN_SPEC_REG ":", truecmd },
1318 #ifdef CONFIG_ASH_BUILTIN_TEST
1319 { BUILTIN_REGULAR "[", testcmd },
1320 { BUILTIN_REGULAR "[[", testcmd },
1322 #ifdef CONFIG_ASH_ALIAS
1323 { BUILTIN_REG_ASSG "alias", aliascmd },
1326 { BUILTIN_REGULAR "bg", bgcmd },
1328 { BUILTIN_SPEC_REG "break", breakcmd },
1329 { BUILTIN_REGULAR "cd", cdcmd },
1330 { BUILTIN_NOSPEC "chdir", cdcmd },
1331 #ifdef CONFIG_ASH_CMDCMD
1332 { BUILTIN_REGULAR "command", commandcmd },
1334 { BUILTIN_SPEC_REG "continue", breakcmd },
1335 #ifdef CONFIG_ASH_BUILTIN_ECHO
1336 { BUILTIN_REGULAR "echo", echocmd },
1338 { BUILTIN_SPEC_REG "eval", evalcmd },
1339 { BUILTIN_SPEC_REG "exec", execcmd },
1340 { BUILTIN_SPEC_REG "exit", exitcmd },
1341 { BUILTIN_SPEC_REG_ASSG "export", exportcmd },
1342 { BUILTIN_REGULAR "false", falsecmd },
1344 { BUILTIN_REGULAR "fg", fgcmd },
1346 #ifdef CONFIG_ASH_GETOPTS
1347 { BUILTIN_REGULAR "getopts", getoptscmd },
1349 { BUILTIN_NOSPEC "hash", hashcmd },
1350 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
1351 { BUILTIN_NOSPEC "help", helpcmd },
1354 { BUILTIN_REGULAR "jobs", jobscmd },
1355 { BUILTIN_REGULAR "kill", killcmd },
1357 #ifdef CONFIG_ASH_MATH_SUPPORT
1358 { BUILTIN_NOSPEC "let", letcmd },
1360 { BUILTIN_ASSIGN "local", localcmd },
1361 { BUILTIN_NOSPEC "pwd", pwdcmd },
1362 { BUILTIN_REGULAR "read", readcmd },
1363 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
1364 { BUILTIN_SPEC_REG "return", returncmd },
1365 { BUILTIN_SPEC_REG "set", setcmd },
1366 { BUILTIN_SPEC_REG "source", dotcmd },
1367 { BUILTIN_SPEC_REG "shift", shiftcmd },
1368 #ifdef CONFIG_ASH_BUILTIN_TEST
1369 { BUILTIN_REGULAR "test", testcmd },
1371 { BUILTIN_SPEC_REG "times", timescmd },
1372 { BUILTIN_SPEC_REG "trap", trapcmd },
1373 { BUILTIN_REGULAR "true", truecmd },
1374 { BUILTIN_NOSPEC "type", typecmd },
1375 { BUILTIN_NOSPEC "ulimit", ulimitcmd },
1376 { BUILTIN_REGULAR "umask", umaskcmd },
1377 #ifdef CONFIG_ASH_ALIAS
1378 { BUILTIN_REGULAR "unalias", unaliascmd },
1380 { BUILTIN_SPEC_REG "unset", unsetcmd },
1381 { BUILTIN_REGULAR "wait", waitcmd },
1384 #define NUMBUILTINS (sizeof (builtincmd) / sizeof (struct builtincmd) )
1392 const struct builtincmd *cmd;
1393 struct funcnode *func;
1398 /* action to find_command() */
1399 #define DO_ERR 0x01 /* prints errors */
1400 #define DO_ABS 0x02 /* checks absolute paths */
1401 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
1402 #define DO_ALTPATH 0x08 /* using alternate path */
1403 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
1405 static const char *pathopt; /* set by padvance */
1407 static void shellexec(char **, const char *, int)
1409 static char *padvance(const char **, const char *);
1410 static void find_command(char *, struct cmdentry *, int, const char *);
1411 static struct builtincmd *find_builtin(const char *);
1412 static void hashcd(void);
1413 static void changepath(const char *);
1414 static void defun(char *, union node *);
1415 static void unsetfunc(const char *);
1417 #ifdef CONFIG_ASH_MATH_SUPPORT_64
1418 typedef int64_t arith_t;
1419 #define arith_t_type (long long)
1421 typedef long arith_t;
1422 #define arith_t_type (long)
1425 #ifdef CONFIG_ASH_MATH_SUPPORT
1426 static arith_t dash_arith(const char *);
1427 static arith_t arith(const char *expr, int *perrcode);
1430 #ifdef CONFIG_ASH_RANDOM_SUPPORT
1431 static unsigned long rseed;
1432 static void change_random(const char *);
1433 # ifndef DYNAMIC_VAR
1434 # define DYNAMIC_VAR
1440 static void reset(void);
1449 #define VEXPORT 0x01 /* variable is exported */
1450 #define VREADONLY 0x02 /* variable cannot be modified */
1451 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1452 #define VTEXTFIXED 0x08 /* text is statically allocated */
1453 #define VSTACK 0x10 /* text is allocated on the stack */
1454 #define VUNSET 0x20 /* the variable is not set */
1455 #define VNOFUNC 0x40 /* don't call the callback function */
1456 #define VNOSET 0x80 /* do not set variable - just readonly test */
1457 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1459 # define VDYNAMIC 0x200 /* dynamic variable */
1465 struct var *next; /* next entry in hash list */
1466 int flags; /* flags are defined above */
1467 const char *text; /* name=value */
1468 void (*func)(const char *); /* function to be called when */
1469 /* the variable gets set/unset */
1473 struct localvar *next; /* next local variable in list */
1474 struct var *vp; /* the variable that was made local */
1475 int flags; /* saved flags */
1476 const char *text; /* saved text */
1480 static struct localvar *localvars;
1486 #ifdef CONFIG_ASH_GETOPTS
1487 static void getoptsreset(const char *);
1490 #ifdef CONFIG_LOCALE_SUPPORT
1492 static void change_lc_all(const char *value);
1493 static void change_lc_ctype(const char *value);
1499 static const char defpathvar[] = "PATH=/usr/local/bin:/usr/bin:/sbin:/bin";
1501 static const char defifsvar[] = "IFS= \t\n";
1502 #define defifs (defifsvar + 4)
1504 static const char defifs[] = " \t\n";
1508 static struct var varinit[] = {
1510 { 0, VSTRFIXED|VTEXTFIXED, defifsvar, 0 },
1512 { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0", 0 },
1515 #ifdef CONFIG_ASH_MAIL
1516 { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0", changemail },
1517 { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail },
1520 { 0, VSTRFIXED|VTEXTFIXED, defpathvar, changepath },
1521 { 0, VSTRFIXED|VTEXTFIXED, "PS1=$ ", 0 },
1522 { 0, VSTRFIXED|VTEXTFIXED, "PS2=> ", 0 },
1523 { 0, VSTRFIXED|VTEXTFIXED, "PS4=+ ", 0 },
1524 #ifdef CONFIG_ASH_GETOPTS
1525 { 0, VSTRFIXED|VTEXTFIXED, "OPTIND=1", getoptsreset },
1527 #ifdef CONFIG_ASH_RANDOM_SUPPORT
1528 {0, VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random },
1530 #ifdef CONFIG_LOCALE_SUPPORT
1531 {0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_ALL\0", change_lc_all },
1532 {0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_CTYPE\0", change_lc_ctype },
1534 #ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
1535 {0, VSTRFIXED | VTEXTFIXED | VUNSET, "HISTFILE\0", NULL },
1539 #define vifs varinit[0]
1540 #ifdef CONFIG_ASH_MAIL
1541 #define vmail (&vifs)[1]
1542 #define vmpath (&vmail)[1]
1546 #define vpath (&vmpath)[1]
1547 #define vps1 (&vpath)[1]
1548 #define vps2 (&vps1)[1]
1549 #define vps4 (&vps2)[1]
1550 #define voptind (&vps4)[1]
1551 #ifdef CONFIG_ASH_GETOPTS
1552 #define vrandom (&voptind)[1]
1554 #define vrandom (&vps4)[1]
1556 #define defpath (defpathvar + 5)
1559 * The following macros access the values of the above variables.
1560 * They have to skip over the name. They return the null string
1561 * for unset variables.
1564 #define ifsval() (vifs.text + 4)
1565 #define ifsset() ((vifs.flags & VUNSET) == 0)
1566 #define mailval() (vmail.text + 5)
1567 #define mpathval() (vmpath.text + 9)
1568 #define pathval() (vpath.text + 5)
1569 #define ps1val() (vps1.text + 4)
1570 #define ps2val() (vps2.text + 4)
1571 #define ps4val() (vps4.text + 4)
1572 #define optindval() (voptind.text + 7)
1574 #define mpathset() ((vmpath.flags & VUNSET) == 0)
1576 static void setvar(const char *, const char *, int);
1577 static void setvareq(char *, int);
1578 static void listsetvar(struct strlist *, int);
1579 static char *lookupvar(const char *);
1580 static char *bltinlookup(const char *);
1581 static char **listvars(int, int, char ***);
1582 #define environment() listvars(VEXPORT, VUNSET, 0)
1583 static int showvars(const char *, int, int);
1584 static void poplocalvars(void);
1585 static int unsetvar(const char *);
1586 #ifdef CONFIG_ASH_GETOPTS
1587 static int setvarsafe(const char *, const char *, int);
1589 static int varcmp(const char *, const char *);
1590 static struct var **hashvar(const char *);
1593 static inline int varequal(const char *a, const char *b) {
1594 return !varcmp(a, b);
1598 static int loopnest; /* current loop nesting level */
1601 * The parsefile structure pointed to by the global variable parsefile
1602 * contains information about the current file being read.
1607 struct redirtab *next;
1612 static struct redirtab *redirlist;
1613 static int nullredirs;
1615 extern char **environ;
1620 static void outstr(const char *, FILE *);
1621 static void outcslow(int, FILE *);
1622 static void flushall(void);
1623 static void flusherr(void);
1624 static int out1fmt(const char *, ...)
1625 __attribute__((__format__(__printf__,1,2)));
1626 static int fmtstr(char *, size_t, const char *, ...)
1627 __attribute__((__format__(__printf__,3,4)));
1629 static int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1632 static void out1str(const char *p)
1637 static void out2str(const char *p)
1644 * Initialization code.
1648 * This routine initializes the builtin variables.
1659 * PS1 depends on uid
1661 #if defined(CONFIG_FEATURE_COMMAND_EDITING) && defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
1662 vps1.text = "PS1=\\w \\$ ";
1665 vps1.text = "PS1=# ";
1668 end = vp + sizeof(varinit) / sizeof(varinit[0]);
1670 vpp = hashvar(vp->text);
1673 } while (++vp < end);
1682 basepf.nextc = basepf.buf = basebuf;
1687 signal(SIGCHLD, SIG_DFL);
1695 struct stat st1, st2;
1698 for (envp = environ ; envp && *envp ; envp++) {
1699 if (strchr(*envp, '=')) {
1700 setvareq(*envp, VEXPORT|VTEXTFIXED);
1704 snprintf(ppid, sizeof(ppid), "%d", (int) getppid());
1705 setvar("PPID", ppid, 0);
1707 p = lookupvar("PWD");
1709 if (*p != '/' || stat(p, &st1) || stat(".", &st2) ||
1710 st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
1716 /* PEOF (the end of file marker) */
1719 INPUT_PUSH_FILE = 1,
1720 INPUT_NOFILE_OK = 2,
1724 * The input line number. Input.c just defines this variable, and saves
1725 * and restores it when files are pushed and popped. The user of this
1726 * package must set its value.
1729 static int pgetc(void);
1730 static int pgetc2(void);
1731 static int preadbuffer(void);
1732 static void pungetc(void);
1733 static void pushstring(char *, void *);
1734 static void popstring(void);
1735 static void setinputfd(int, int);
1736 static void setinputstring(char *);
1737 static void popfile(void);
1738 static void popallfiles(void);
1739 static void closescript(void);
1745 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
1748 #define FORK_NOJOB 2
1750 /* mode flags for showjob(s) */
1751 #define SHOW_PGID 0x01 /* only show pgid - for jobs -p */
1752 #define SHOW_PID 0x04 /* include process pid */
1753 #define SHOW_CHANGED 0x08 /* only jobs whose state has changed */
1757 * A job structure contains information about a job. A job is either a
1758 * single process or a set of processes contained in a pipeline. In the
1759 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
1764 pid_t pid; /* process id */
1765 int status; /* last process status from wait() */
1766 char *cmd; /* text of command being run */
1770 struct procstat ps0; /* status of process */
1771 struct procstat *ps; /* status or processes when more than one */
1773 int stopstatus; /* status of a stopped job */
1776 nprocs: 16, /* number of processes */
1778 #define JOBRUNNING 0 /* at least one proc running */
1779 #define JOBSTOPPED 1 /* all procs are stopped */
1780 #define JOBDONE 2 /* all procs are completed */
1782 sigint: 1, /* job was killed by SIGINT */
1783 jobctl: 1, /* job running under job control */
1785 waited: 1, /* true if this entry has been waited for */
1786 used: 1, /* true if this entry is in used */
1787 changed: 1; /* true if status has changed */
1788 struct job *prev_job; /* previous job */
1791 static pid_t backgndpid; /* pid of last background process */
1792 static int job_warning; /* user was warned about stopped jobs */
1794 static int jobctl; /* true if doing job control */
1797 static struct job *makejob(union node *, int);
1798 static int forkshell(struct job *, union node *, int);
1799 static int waitforjob(struct job *);
1800 static int stoppedjobs(void);
1803 #define setjobctl(on) /* do nothing */
1805 static void setjobctl(int);
1806 static void showjobs(FILE *, int);
1812 /* pid of main shell */
1814 /* shell level: 0 for the main shell, 1 for its children, and so on */
1816 #define rootshell (!shlvl)
1818 static void readcmdfile(char *);
1819 static int cmdloop(int);
1825 struct stack_block *stackp;
1828 struct stackmark *marknext;
1831 /* minimum size of a block */
1832 #define MINSIZE SHELL_ALIGN(504)
1834 struct stack_block {
1835 struct stack_block *prev;
1836 char space[MINSIZE];
1839 static struct stack_block stackbase;
1840 static struct stack_block *stackp = &stackbase;
1841 static struct stackmark *markp;
1842 static char *stacknxt = stackbase.space;
1843 static size_t stacknleft = MINSIZE;
1844 static char *sstrend = stackbase.space + MINSIZE;
1845 static int herefd = -1;
1848 static pointer ckmalloc(size_t);
1849 static pointer ckrealloc(pointer, size_t);
1850 static char *savestr(const char *);
1851 static pointer stalloc(size_t);
1852 static void stunalloc(pointer);
1853 static void setstackmark(struct stackmark *);
1854 static void popstackmark(struct stackmark *);
1855 static void growstackblock(void);
1856 static void *growstackstr(void);
1857 static char *makestrspace(size_t, char *);
1858 static char *stnputs(const char *, size_t, char *);
1859 static char *stputs(const char *, char *);
1862 static inline char *_STPUTC(int c, char *p) {
1869 #define stackblock() ((void *)stacknxt)
1870 #define stackblocksize() stacknleft
1871 #define STARTSTACKSTR(p) ((p) = stackblock())
1872 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1873 #define CHECKSTRSPACE(n, p) \
1877 size_t m = sstrend - q; \
1879 (p) = makestrspace(l, q); \
1882 #define USTPUTC(c, p) (*p++ = (c))
1883 #define STACKSTRNUL(p) ((p) == sstrend? (p = growstackstr(), *p = '\0') : (*p = '\0'))
1884 #define STUNPUTC(p) (--p)
1885 #define STTOPC(p) p[-1]
1886 #define STADJUST(amount, p) (p += (amount))
1888 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1889 #define ungrabstackstr(s, p) stunalloc((s))
1890 #define stackstrend() ((void *)sstrend)
1892 #define ckfree(p) free((pointer)(p))
1897 #define DOLATSTRLEN 4
1899 static char *prefix(const char *, const char *);
1900 static int number(const char *);
1901 static int is_number(const char *);
1902 static char *single_quote(const char *);
1903 static char *sstrdup(const char *);
1905 #define equal(s1, s2) (strcmp(s1, s2) == 0)
1906 #define scopy(s1, s2) ((void)strcpy(s2, s1))
1911 int nparam; /* # of positional parameters (without $0) */
1912 unsigned char malloc; /* if parameter list dynamically allocated */
1913 char **p; /* parameter list */
1914 #ifdef CONFIG_ASH_GETOPTS
1915 int optind; /* next parameter to be processed by getopts */
1916 int optoff; /* used by getopts */
1921 #define eflag optlist[0]
1922 #define fflag optlist[1]
1923 #define Iflag optlist[2]
1924 #define iflag optlist[3]
1925 #define mflag optlist[4]
1926 #define nflag optlist[5]
1927 #define sflag optlist[6]
1928 #define xflag optlist[7]
1929 #define vflag optlist[8]
1930 #define Cflag optlist[9]
1931 #define aflag optlist[10]
1932 #define bflag optlist[11]
1933 #define uflag optlist[12]
1934 #define viflag optlist[13]
1937 #define nolog optlist[14]
1938 #define debug optlist[15]
1941 #ifndef CONFIG_FEATURE_COMMAND_EDITING_VI
1942 #define setvimode(on) viflag = 0 /* forcibly keep the option off */
1948 static const char *const optletters_optnames[] = {
1969 #define optletters(n) optletters_optnames[(n)][0]
1970 #define optnames(n) (&optletters_optnames[(n)][1])
1972 #define NOPTS (sizeof(optletters_optnames)/sizeof(optletters_optnames[0]))
1974 static char optlist[NOPTS];
1977 static char *arg0; /* value of $0 */
1978 static struct shparam shellparam; /* $@ current positional parameters */
1979 static char **argptr; /* argument list for builtin commands */
1980 static char *optionarg; /* set by nextopt (like getopt) */
1981 static char *optptr; /* used by nextopt */
1983 static char *minusc; /* argument to -c option */
1986 static void procargs(int, char **);
1987 static void optschanged(void);
1988 static void setparam(char **);
1989 static void freeparam(volatile struct shparam *);
1990 static int shiftcmd(int, char **);
1991 static int setcmd(int, char **);
1992 static int nextopt(const char *);
1996 /* flags passed to redirect */
1997 #define REDIR_PUSH 01 /* save previous values of file descriptors */
1998 #define REDIR_SAVEFD2 03 /* set preverrout */
2001 static void redirect(union node *, int);
2002 static void popredir(int);
2003 static void clearredir(int);
2004 static int copyfd(int, int);
2005 static int redirectsafe(union node *, int);
2011 static void showtree(union node *);
2012 static void trace(const char *, ...);
2013 static void tracev(const char *, va_list);
2014 static void trargs(char **);
2015 static void trputc(int);
2016 static void trputs(const char *);
2017 static void opentrace(void);
2023 /* trap handler commands */
2024 static char *trap[NSIG];
2025 /* current value of signal */
2026 static char sigmode[NSIG - 1];
2027 /* indicates specified signal received */
2028 static char gotsig[NSIG - 1];
2030 static void clear_traps(void);
2031 static void setsignal(int);
2032 static void ignoresig(int);
2033 static void onsig(int);
2034 static int dotrap(void);
2035 static void setinteractive(int);
2036 static void exitshell(void) ATTRIBUTE_NORETURN;
2037 static int decode_signal(const char *, int);
2040 * This routine is called when an error or an interrupt occurs in an
2041 * interactive shell and control is returned to the main command loop.
2055 parselleft = parsenleft = 0; /* clear input buffer */
2059 /* from parser.c: */
2072 #ifdef CONFIG_ASH_ALIAS
2073 static struct alias *atab[ATABSIZE];
2075 static void setalias(const char *, const char *);
2076 static struct alias *freealias(struct alias *);
2077 static struct alias **__lookupalias(const char *);
2080 setalias(const char *name, const char *val)
2082 struct alias *ap, **app;
2084 app = __lookupalias(name);
2088 if (!(ap->flag & ALIASINUSE)) {
2091 ap->val = savestr(val);
2092 ap->flag &= ~ALIASDEAD;
2095 ap = ckmalloc(sizeof (struct alias));
2096 ap->name = savestr(name);
2097 ap->val = savestr(val);
2106 unalias(const char *name)
2110 app = __lookupalias(name);
2114 *app = freealias(*app);
2125 struct alias *ap, **app;
2129 for (i = 0; i < ATABSIZE; i++) {
2131 for (ap = *app; ap; ap = *app) {
2132 *app = freealias(*app);
2141 static struct alias *
2142 lookupalias(const char *name, int check)
2144 struct alias *ap = *__lookupalias(name);
2146 if (check && ap && (ap->flag & ALIASINUSE))
2152 * TODO - sort output
2155 aliascmd(int argc, char **argv)
2164 for (i = 0; i < ATABSIZE; i++)
2165 for (ap = atab[i]; ap; ap = ap->next) {
2170 while ((n = *++argv) != NULL) {
2171 if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */
2172 if ((ap = *__lookupalias(n)) == NULL) {
2173 fprintf(stderr, "%s: %s not found\n", "alias", n);
2187 unaliascmd(int argc, char **argv)
2191 while ((i = nextopt("a")) != '\0') {
2197 for (i = 0; *argptr; argptr++) {
2198 if (unalias(*argptr)) {
2199 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
2207 static struct alias *
2208 freealias(struct alias *ap) {
2211 if (ap->flag & ALIASINUSE) {
2212 ap->flag |= ALIASDEAD;
2224 printalias(const struct alias *ap) {
2225 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
2228 static struct alias **
2229 __lookupalias(const char *name) {
2230 unsigned int hashval;
2237 ch = (unsigned char)*p;
2241 ch = (unsigned char)*++p;
2243 app = &atab[hashval % ATABSIZE];
2245 for (; *app; app = &(*app)->next) {
2246 if (equal(name, (*app)->name)) {
2253 #endif /* CONFIG_ASH_ALIAS */
2259 * The cd and pwd commands.
2262 #define CD_PHYSICAL 1
2265 static int docd(const char *, int);
2266 static int cdopt(void);
2268 static char *curdir = nullstr; /* current working directory */
2269 static char *physdir = nullstr; /* physical working directory */
2278 while ((i = nextopt("LP"))) {
2280 flags ^= CD_PHYSICAL;
2289 cdcmd(int argc, char **argv)
2301 dest = bltinlookup(homestr);
2302 else if (dest[0] == '-' && dest[1] == '\0') {
2303 dest = bltinlookup("OLDPWD");
2325 if (!(path = bltinlookup("CDPATH"))) {
2333 p = padvance(&path, dest);
2334 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2338 if (!docd(p, flags))
2343 sh_error("can't cd to %s", dest);
2346 if (flags & CD_PRINT)
2347 out1fmt(snlfmt, curdir);
2353 * Update curdir (the name of the current directory) in response to a
2357 static inline const char *
2358 updatepwd(const char *dir)
2365 cdcomppath = sstrdup(dir);
2368 if (curdir == nullstr)
2370 new = stputs(curdir, new);
2372 new = makestrspace(strlen(dir) + 2, new);
2373 lim = stackblock() + 1;
2377 if (new > lim && *lim == '/')
2382 if (dir[1] == '/' && dir[2] != '/') {
2388 p = strtok(cdcomppath, "/");
2392 if (p[1] == '.' && p[2] == '\0') {
2399 } else if (p[1] == '\0')
2403 new = stputs(p, new);
2411 return stackblock();
2415 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2416 * know that the current directory has changed.
2420 docd(const char *dest, int flags)
2422 const char *dir = 0;
2425 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2428 if (!(flags & CD_PHYSICAL)) {
2429 dir = updatepwd(dest);
2444 * Find out what the current directory is. If we already know the current
2445 * directory, this routine returns immediately.
2447 static inline char *
2450 char *dir = getcwd(0, 0);
2451 return dir ? dir : nullstr;
2455 pwdcmd(int argc, char **argv)
2458 const char *dir = curdir;
2462 if (physdir == nullstr)
2466 out1fmt(snlfmt, dir);
2471 setpwd(const char *val, int setold)
2475 oldcur = dir = curdir;
2478 setvar("OLDPWD", oldcur, VEXPORT);
2481 if (physdir != nullstr) {
2482 if (physdir != oldcur)
2486 if (oldcur == val || !val) {
2493 if (oldcur != dir && oldcur != nullstr) {
2498 setvar("PWD", dir, VEXPORT);
2504 * Errors and exceptions.
2508 * Code to handle exceptions in C.
2513 static void exverror(int, const char *, va_list)
2517 * Called to raise an exception. Since C doesn't include exceptions, we
2518 * just do a longjmp to the exception handler. The type of exception is
2519 * stored in the global variable "exception".
2526 if (handler == NULL)
2532 longjmp(handler->loc, 1);
2537 * Called from trap.c when a SIGINT is received. (If the user specifies
2538 * that SIGINT is to be trapped or ignored using the trap builtin, then
2539 * this routine is not called.) Suppressint is nonzero when interrupts
2540 * are held using the INTOFF macro. (The test for iflag is just
2541 * defensive programming.)
2550 /* comment by vodz: its strange for me, this programm don`t use other
2555 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
2556 if (!(rootshell && iflag)) {
2557 signal(SIGINT, SIG_DFL);
2567 exvwarning(const char *msg, va_list ap)
2572 fprintf(errs, "%s: ", arg0);
2574 const char *fmt = (!iflag || parsefile->fd) ?
2575 "%s: %d: " : "%s: ";
2576 fprintf(errs, fmt, commandname, startlinno);
2578 vfprintf(errs, msg, ap);
2579 outcslow('\n', errs);
2583 * Exverror is called to raise the error exception. If the second argument
2584 * is not NULL then error prints an error message using printf style
2585 * formatting. It then raises the error exception.
2588 exverror(int cond, const char *msg, va_list ap)
2592 TRACE(("exverror(%d, \"", cond));
2594 TRACE(("\") pid=%d\n", getpid()));
2596 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
2599 exvwarning(msg, ap);
2608 sh_error(const char *msg, ...)
2613 exverror(EXERROR, msg, ap);
2620 exerror(int cond, const char *msg, ...)
2625 exverror(cond, msg, ap);
2631 * error/warning routines for external builtins
2635 sh_warnx(const char *fmt, ...)
2640 exvwarning(fmt, ap);
2646 * Return a string describing an error. The returned string may be a
2647 * pointer to a static buffer that will be overwritten on the next call.
2648 * Action describes the operation that got the error.
2652 errmsg(int e, const char *em)
2654 if(e == ENOENT || e == ENOTDIR) {
2665 * Evaluate a command.
2668 /* flags in argument to evaltree */
2669 #define EV_EXIT 01 /* exit after evaluating tree */
2670 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
2671 #define EV_BACKCMD 04 /* command executing within back quotes */
2674 static void evalloop(union node *, int);
2675 static void evalfor(union node *, int);
2676 static void evalcase(union node *, int);
2677 static void evalsubshell(union node *, int);
2678 static void expredir(union node *);
2679 static void evalpipe(union node *, int);
2680 static void evalcommand(union node *, int);
2681 static int evalbltin(const struct builtincmd *, int, char **);
2682 static int evalfun(struct funcnode *, int, char **, int);
2683 static void prehash(union node *);
2684 static int bltincmd(int, char **);
2687 static const struct builtincmd bltin = {
2693 * Called to reset things after an exception.
2701 evalcmd(int argc, char **argv)
2710 STARTSTACKSTR(concat);
2713 concat = stputs(p, concat);
2714 if ((p = *ap++) == NULL)
2716 STPUTC(' ', concat);
2718 STPUTC('\0', concat);
2719 p = grabstackstr(concat);
2721 evalstring(p, ~SKIPEVAL);
2729 * Execute a command or commands contained in a string.
2733 evalstring(char *s, int mask)
2736 struct stackmark smark;
2740 setstackmark(&smark);
2743 while ((n = parsecmd(0)) != NEOF) {
2745 popstackmark(&smark);
2760 * Evaluate a parse tree. The value is left in the global variable
2765 evaltree(union node *n, int flags)
2768 void (*evalfn)(union node *, int);
2772 TRACE(("evaltree(NULL) called\n"));
2775 TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
2776 getpid(), n, n->type, flags));
2780 out1fmt("Node type = %d\n", n->type);
2785 evaltree(n->nnot.com, EV_TESTED);
2786 status = !exitstatus;
2789 expredir(n->nredir.redirect);
2790 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
2792 evaltree(n->nredir.n, flags & EV_TESTED);
2793 status = exitstatus;
2798 evalfn = evalcommand;
2800 if (eflag && !(flags & EV_TESTED))
2812 evalfn = evalsubshell;
2824 #error NAND + 1 != NOR
2826 #if NOR + 1 != NSEMI
2827 #error NOR + 1 != NSEMI
2829 isor = n->type - NAND;
2832 (flags | ((isor >> 1) - 1)) & EV_TESTED
2834 if (!exitstatus == isor)
2846 evaltree(n->nif.test, EV_TESTED);
2849 if (exitstatus == 0) {
2852 } else if (n->nif.elsepart) {
2853 n = n->nif.elsepart;
2858 defun(n->narg.text, n->narg.next);
2862 exitstatus = status;
2866 if ((checkexit & exitstatus))
2867 evalskip |= SKIPEVAL;
2868 else if (pendingsigs && dotrap())
2871 if (flags & EV_EXIT) {
2878 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
2881 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
2885 evalloop(union node *n, int flags)
2895 evaltree(n->nbinary.ch1, EV_TESTED);
2897 skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
2901 if (evalskip == SKIPBREAK && --skipcount <= 0)
2906 if (n->type != NWHILE)
2910 evaltree(n->nbinary.ch2, flags);
2911 status = exitstatus;
2916 exitstatus = status;
2922 evalfor(union node *n, int flags)
2924 struct arglist arglist;
2927 struct stackmark smark;
2929 setstackmark(&smark);
2930 arglist.lastp = &arglist.list;
2931 for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
2932 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
2937 *arglist.lastp = NULL;
2942 for (sp = arglist.list ; sp ; sp = sp->next) {
2943 setvar(n->nfor.var, sp->text, 0);
2944 evaltree(n->nfor.body, flags);
2946 if (evalskip == SKIPCONT && --skipcount <= 0) {
2950 if (evalskip == SKIPBREAK && --skipcount <= 0)
2957 popstackmark(&smark);
2963 evalcase(union node *n, int flags)
2967 struct arglist arglist;
2968 struct stackmark smark;
2970 setstackmark(&smark);
2971 arglist.lastp = &arglist.list;
2972 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
2974 for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
2975 for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {
2976 if (casematch(patp, arglist.list->text)) {
2977 if (evalskip == 0) {
2978 evaltree(cp->nclist.body, flags);
2985 popstackmark(&smark);
2991 * Kick off a subshell to evaluate a tree.
2995 evalsubshell(union node *n, int flags)
2998 int backgnd = (n->type == NBACKGND);
3001 expredir(n->nredir.redirect);
3002 if (!backgnd && flags & EV_EXIT && !trap[0])
3006 if (forkshell(jp, n, backgnd) == 0) {
3010 flags &=~ EV_TESTED;
3012 redirect(n->nredir.redirect, 0);
3013 evaltreenr(n->nredir.n, flags);
3018 status = waitforjob(jp);
3019 exitstatus = status;
3026 * Compute the names of the files in a redirection list.
3030 expredir(union node *n)
3034 for (redir = n ; redir ; redir = redir->nfile.next) {
3036 fn.lastp = &fn.list;
3037 switch (redir->type) {
3043 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
3044 redir->nfile.expfname = fn.list->text;
3048 if (redir->ndup.vname) {
3049 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
3050 fixredir(redir, fn.list->text, 1);
3060 * Evaluate a pipeline. All the processes in the pipeline are children
3061 * of the process creating the pipeline. (This differs from some versions
3062 * of the shell, which make the last process in a pipeline the parent
3067 evalpipe(union node *n, int flags)
3070 struct nodelist *lp;
3075 TRACE(("evalpipe(0x%lx) called\n", (long)n));
3077 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
3081 jp = makejob(n, pipelen);
3083 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
3087 if (pipe(pip) < 0) {
3089 sh_error("Pipe call failed");
3092 if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
3105 evaltreenr(lp->n, flags);
3113 if (n->npipe.backgnd == 0) {
3114 exitstatus = waitforjob(jp);
3115 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
3123 * Execute a command inside back quotes. If it's a builtin command, we
3124 * want to save its output in a block obtained from malloc. Otherwise
3125 * we fork off a subprocess and get the output of the command via a pipe.
3126 * Should be called with interrupts off.
3130 evalbackcmd(union node *n, struct backcmd *result)
3142 saveherefd = herefd;
3150 sh_error("Pipe call failed");
3152 if (forkshell(jp, n, FORK_NOJOB) == 0) {
3161 evaltreenr(n, EV_EXIT);
3165 result->fd = pip[0];
3168 herefd = saveherefd;
3170 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
3171 result->fd, result->buf, result->nleft, result->jp));
3174 #ifdef CONFIG_ASH_CMDCMD
3175 static inline char **
3176 parse_command_args(char **argv, const char **path)
3188 if (c == '-' && !*cp) {
3198 /* run 'typecmd' for other options */
3201 } while ((c = *cp++));
3208 isassignment(const char *p)
3210 const char *q = endofname(p);
3216 #ifdef CONFIG_ASH_EXPAND_PRMT
3217 static const char *expandstr(const char *ps);
3219 #define expandstr(s) s
3223 * Execute a simple command.
3227 evalcommand(union node *cmd, int flags)
3229 struct stackmark smark;
3231 struct arglist arglist;
3232 struct arglist varlist;
3235 const struct strlist *sp;
3236 struct cmdentry cmdentry;
3244 struct builtincmd *bcmd;
3245 int pseudovarflag = 0;
3247 /* First expand the arguments. */
3248 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
3249 setstackmark(&smark);
3250 back_exitstatus = 0;
3252 cmdentry.cmdtype = CMDBUILTIN;
3253 cmdentry.u.cmd = &bltin;
3254 varlist.lastp = &varlist.list;
3255 *varlist.lastp = NULL;
3256 arglist.lastp = &arglist.list;
3257 *arglist.lastp = NULL;
3262 bcmd = find_builtin(cmd->ncmd.args->narg.text);
3263 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
3266 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
3267 struct strlist **spp;
3269 spp = arglist.lastp;
3270 if (pseudovarflag && isassignment(argp->narg.text))
3271 expandarg(argp, &arglist, EXP_VARTILDE);
3273 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
3275 for (sp = *spp; sp; sp = sp->next)
3279 argv = nargv = stalloc(sizeof (char *) * (argc + 1));
3280 for (sp = arglist.list ; sp ; sp = sp->next) {
3281 TRACE(("evalcommand arg: %s\n", sp->text));
3282 *nargv++ = sp->text;
3287 if (iflag && funcnest == 0 && argc > 0)
3288 lastarg = nargv[-1];
3291 expredir(cmd->ncmd.redirect);
3292 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH|REDIR_SAVEFD2);
3295 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
3296 struct strlist **spp;
3299 spp = varlist.lastp;
3300 expandarg(argp, &varlist, EXP_VARTILDE);
3303 * Modify the command lookup path, if a PATH= assignment
3307 if (varequal(p, path))
3311 /* Print the command if xflag is set. */
3314 const char *p = " %s";
3317 dprintf(preverrout_fd, p, expandstr(ps4val()));
3320 for(n = 0; n < 2; n++) {
3322 dprintf(preverrout_fd, p, sp->text);
3330 bb_full_write(preverrout_fd, "\n", 1);
3336 /* Now locate the command. */
3338 const char *oldpath;
3339 int cmd_flag = DO_ERR;
3344 find_command(argv[0], &cmdentry, cmd_flag, path);
3345 if (cmdentry.cmdtype == CMDUNKNOWN) {
3351 /* implement bltin and command here */
3352 if (cmdentry.cmdtype != CMDBUILTIN)
3355 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
3356 if (cmdentry.u.cmd == EXECCMD)
3358 #ifdef CONFIG_ASH_CMDCMD
3359 if (cmdentry.u.cmd == COMMANDCMD) {
3362 nargv = parse_command_args(argv, &path);
3365 argc -= nargv - argv;
3367 cmd_flag |= DO_NOFUNC;
3375 /* We have a redirection error. */
3379 exitstatus = status;
3383 /* Execute the command. */
3384 switch (cmdentry.cmdtype) {
3386 /* Fork off a child process if necessary. */
3387 if (!(flags & EV_EXIT) || trap[0]) {
3389 jp = makejob(cmd, 1);
3390 if (forkshell(jp, cmd, FORK_FG) != 0) {
3391 exitstatus = waitforjob(jp);
3397 listsetvar(varlist.list, VEXPORT|VSTACK);
3398 shellexec(argv, path, cmdentry.u.index);
3402 cmdenviron = varlist.list;
3404 struct strlist *list = cmdenviron;
3406 if (spclbltin > 0 || argc == 0) {
3408 if (cmd_is_exec && argc > 1)
3411 listsetvar(list, i);
3413 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
3428 exit_status = j + 128;
3429 exitstatus = exit_status;
3431 if (i == EXINT || spclbltin > 0) {
3433 longjmp(handler->loc, 1);
3440 listsetvar(varlist.list, 0);
3441 if (evalfun(cmdentry.u.func, argc, argv, flags))
3447 popredir(cmd_is_exec);
3449 /* dsl: I think this is intended to be used to support
3450 * '_' in 'vi' command mode during line editing...
3451 * However I implemented that within libedit itself.
3453 setvar("_", lastarg, 0);
3454 popstackmark(&smark);
3458 evalbltin(const struct builtincmd *cmd, int argc, char **argv) {
3459 char *volatile savecmdname;
3460 struct jmploc *volatile savehandler;
3461 struct jmploc jmploc;
3464 savecmdname = commandname;
3465 if ((i = setjmp(jmploc.loc)))
3467 savehandler = handler;
3469 commandname = argv[0];
3471 optptr = NULL; /* initialize nextopt */
3472 exitstatus = (*cmd->builtin)(argc, argv);
3475 exitstatus |= ferror(stdout);
3476 commandname = savecmdname;
3478 handler = savehandler;
3484 evalfun(struct funcnode *func, int argc, char **argv, int flags)
3486 volatile struct shparam saveparam;
3487 struct localvar *volatile savelocalvars;
3488 struct jmploc *volatile savehandler;
3489 struct jmploc jmploc;
3492 saveparam = shellparam;
3493 savelocalvars = localvars;
3494 if ((e = setjmp(jmploc.loc))) {
3498 savehandler = handler;
3501 shellparam.malloc = 0;
3505 shellparam.nparam = argc - 1;
3506 shellparam.p = argv + 1;
3507 #ifdef CONFIG_ASH_GETOPTS
3508 shellparam.optind = 1;
3509 shellparam.optoff = -1;
3511 evaltree(&func->n, flags & EV_TESTED);
3517 localvars = savelocalvars;
3518 freeparam(&shellparam);
3519 shellparam = saveparam;
3520 handler = savehandler;
3522 evalskip &= ~SKIPFUNC;
3528 goodname(const char *p)
3530 return !*endofname(p);
3534 * Search for a command. This is called before we fork so that the
3535 * location of the command will be available in the parent as well as
3536 * the child. The check for "goodname" is an overly conservative
3537 * check that the name will not be subject to expansion.
3541 prehash(union node *n)
3543 struct cmdentry entry;
3545 if (n->type == NCMD && n->ncmd.args)
3546 if (goodname(n->ncmd.args->narg.text))
3547 find_command(n->ncmd.args->narg.text, &entry, 0,
3554 * Builtin commands. Builtin commands whose functions are closely
3555 * tied to evaluation are implemented here.
3563 bltincmd(int argc, char **argv)
3566 * Preserve exitstatus of a previous possible redirection
3569 return back_exitstatus;
3574 * Handle break and continue commands. Break, continue, and return are
3575 * all handled by setting the evalskip flag. The evaluation routines
3576 * above all check this flag, and if it is set they start skipping
3577 * commands rather than executing them. The variable skipcount is
3578 * the number of loops to break/continue, or the number of function
3579 * levels to return. (The latter is always 1.) It should probably
3580 * be an error to break out of more loops than exist, but it isn't
3581 * in the standard shell so we don't make it one here.
3585 breakcmd(int argc, char **argv)
3587 int n = argc > 1 ? number(argv[1]) : 1;
3590 sh_error(illnum, argv[1]);
3594 evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
3602 * The return command.
3606 returncmd(int argc, char **argv)
3609 * If called outside a function, do what ksh does;
3610 * skip the rest of the file.
3612 evalskip = funcnest ? SKIPFUNC : SKIPFILE;
3613 return argv[1] ? number(argv[1]) : exitstatus;
3618 falsecmd(int argc, char **argv)
3625 truecmd(int argc, char **argv)
3632 execcmd(int argc, char **argv)
3635 iflag = 0; /* exit on error */
3638 shellexec(argv + 1, pathval(), 0);
3647 * When commands are first encountered, they are entered in a hash table.
3648 * This ensures that a full path search will not have to be done for them
3649 * on each invocation.
3651 * We should investigate converting to a linear search, even though that
3652 * would make the command name "hash" a misnomer.
3655 #define CMDTABLESIZE 31 /* should be prime */
3656 #define ARB 1 /* actual size determined at run time */
3661 struct tblentry *next; /* next entry in hash chain */
3662 union param param; /* definition of builtin function */
3663 short cmdtype; /* index identifying command */
3664 char rehash; /* if set, cd done since entry created */
3665 char cmdname[ARB]; /* name of command */
3669 static struct tblentry *cmdtable[CMDTABLESIZE];
3670 static int builtinloc = -1; /* index in path of %builtin, or -1 */
3673 static void tryexec(char *, char **, char **);
3674 static void clearcmdentry(int);
3675 static struct tblentry *cmdlookup(const char *, int);
3676 static void delete_cmd_entry(void);
3680 * Exec a program. Never returns. If you change this routine, you may
3681 * have to change the find_command routine as well.
3685 shellexec(char **argv, const char *path, int idx)
3693 envp = environment();
3694 if (strchr(argv[0], '/') != NULL
3695 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3696 || find_applet_by_name(argv[0])
3699 tryexec(argv[0], argv, envp);
3703 while ((cmdname = padvance(&path, argv[0])) != NULL) {
3704 if (--idx < 0 && pathopt == NULL) {
3705 tryexec(cmdname, argv, envp);
3706 if (errno != ENOENT && errno != ENOTDIR)
3713 /* Map to POSIX errors */
3725 exitstatus = exerrno;
3726 TRACE(("shellexec failed for %s, errno %d, suppressint %d\n",
3727 argv[0], e, suppressint ));
3728 exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
3734 tryexec(char *cmd, char **argv, char **envp)
3737 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3738 if(find_applet_by_name(cmd) != NULL) {
3739 /* re-exec ourselves with the new arguments */
3740 execve(CONFIG_BUSYBOX_EXEC_PATH,argv,envp);
3741 /* If they called chroot or otherwise made the binary no longer
3742 * executable, fall through */
3749 execve(cmd, argv, envp);
3750 } while (errno == EINTR);
3752 execve(cmd, argv, envp);
3756 } else if (errno == ENOEXEC) {
3760 for (ap = argv; *ap; ap++)
3762 ap = new = ckmalloc((ap - argv + 2) * sizeof(char *));
3764 *ap = cmd = (char *)DEFAULT_SHELL;
3767 while ((*ap++ = *argv++))
3777 * Do a path search. The variable path (passed by reference) should be
3778 * set to the start of the path before the first call; padvance will update
3779 * this value as it proceeds. Successive calls to padvance will return
3780 * the possible path expansions in sequence. If an option (indicated by
3781 * a percent sign) appears in the path entry then the global variable
3782 * pathopt will be set to point to it; otherwise pathopt will be set to
3787 padvance(const char **path, const char *name)
3797 for (p = start ; *p && *p != ':' && *p != '%' ; p++);
3798 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
3799 while (stackblocksize() < len)
3803 memcpy(q, start, p - start);
3811 while (*p && *p != ':') p++;
3817 return stalloc(len);
3821 /*** Command hashing code ***/
3824 printentry(struct tblentry *cmdp)
3830 idx = cmdp->param.index;
3833 name = padvance(&path, cmdp->cmdname);
3835 } while (--idx >= 0);
3836 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
3841 hashcmd(int argc, char **argv)
3843 struct tblentry **pp;
3844 struct tblentry *cmdp;
3846 struct cmdentry entry;
3849 while ((c = nextopt("r")) != '\0') {
3853 if (*argptr == NULL) {
3854 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
3855 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
3856 if (cmdp->cmdtype == CMDNORMAL)
3863 while ((name = *argptr) != NULL) {
3864 if ((cmdp = cmdlookup(name, 0)) != NULL
3865 && (cmdp->cmdtype == CMDNORMAL
3866 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
3868 find_command(name, &entry, DO_ERR, pathval());
3869 if (entry.cmdtype == CMDUNKNOWN)
3878 * Resolve a command name. If you change this routine, you may have to
3879 * change the shellexec routine as well.
3883 find_command(char *name, struct cmdentry *entry, int act, const char *path)
3885 struct tblentry *cmdp;
3892 struct builtincmd *bcmd;
3894 /* If name contains a slash, don't use PATH or hash table */
3895 if (strchr(name, '/') != NULL) {
3896 entry->u.index = -1;
3898 while (stat(name, &statb) < 0) {
3903 entry->cmdtype = CMDUNKNOWN;
3907 entry->cmdtype = CMDNORMAL;
3911 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3912 if (find_applet_by_name(name)) {
3913 entry->cmdtype = CMDNORMAL;
3914 entry->u.index = -1;
3919 updatetbl = (path == pathval());
3922 if (strstr(path, "%builtin") != NULL)
3926 /* If name is in the table, check answer will be ok */
3927 if ((cmdp = cmdlookup(name, 0)) != NULL) {
3930 switch (cmdp->cmdtype) {
3948 } else if (cmdp->rehash == 0)
3949 /* if not invalidated by cd, we're done */
3953 /* If %builtin not in path, check for builtin next */
3954 bcmd = find_builtin(name);
3955 if (bcmd && (IS_BUILTIN_REGULAR(bcmd) || (
3956 act & DO_ALTPATH ? !(act & DO_ALTBLTIN) : builtinloc <= 0
3958 goto builtin_success;
3960 /* We have to search path. */
3961 prev = -1; /* where to start */
3962 if (cmdp && cmdp->rehash) { /* doing a rehash */
3963 if (cmdp->cmdtype == CMDBUILTIN)
3966 prev = cmdp->param.index;
3972 while ((fullname = padvance(&path, name)) != NULL) {
3973 stunalloc(fullname);
3976 if (prefix(pathopt, "builtin")) {
3978 goto builtin_success;
3980 } else if (!(act & DO_NOFUNC) &&
3981 prefix(pathopt, "func")) {
3984 /* ignore unimplemented options */
3988 /* if rehash, don't redo absolute path names */
3989 if (fullname[0] == '/' && idx <= prev) {
3992 TRACE(("searchexec \"%s\": no change\n", name));
3995 while (stat(fullname, &statb) < 0) {
4000 if (errno != ENOENT && errno != ENOTDIR)
4004 e = EACCES; /* if we fail, this will be the error */
4005 if (!S_ISREG(statb.st_mode))
4007 if (pathopt) { /* this is a %func directory */
4008 stalloc(strlen(fullname) + 1);
4009 readcmdfile(fullname);
4010 if ((cmdp = cmdlookup(name, 0)) == NULL ||
4011 cmdp->cmdtype != CMDFUNCTION)
4012 sh_error("%s not defined in %s", name, fullname);
4013 stunalloc(fullname);
4016 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
4018 entry->cmdtype = CMDNORMAL;
4019 entry->u.index = idx;
4023 cmdp = cmdlookup(name, 1);
4024 cmdp->cmdtype = CMDNORMAL;
4025 cmdp->param.index = idx;
4030 /* We failed. If there was an entry for this command, delete it */
4031 if (cmdp && updatetbl)
4034 sh_warnx("%s: %s", name, errmsg(e, E_EXEC));
4035 entry->cmdtype = CMDUNKNOWN;
4040 entry->cmdtype = CMDBUILTIN;
4041 entry->u.cmd = bcmd;
4045 cmdp = cmdlookup(name, 1);
4046 cmdp->cmdtype = CMDBUILTIN;
4047 cmdp->param.cmd = bcmd;
4051 entry->cmdtype = cmdp->cmdtype;
4052 entry->u = cmdp->param;
4057 * Wrapper around strcmp for qsort/bsearch/...
4059 static int pstrcmp(const void *a, const void *b)
4061 return strcmp((const char *) a, (*(const char *const *) b) + 1);
4065 * Search the table of builtin commands.
4068 static struct builtincmd *
4069 find_builtin(const char *name)
4071 struct builtincmd *bp;
4074 name, builtincmd, NUMBUILTINS, sizeof(struct builtincmd),
4083 * Called when a cd is done. Marks all commands so the next time they
4084 * are executed they will be rehashed.
4090 struct tblentry **pp;
4091 struct tblentry *cmdp;
4093 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
4094 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
4095 if (cmdp->cmdtype == CMDNORMAL || (
4096 cmdp->cmdtype == CMDBUILTIN &&
4097 !(IS_BUILTIN_REGULAR(cmdp->param.cmd)) &&
4108 * Fix command hash table when PATH changed.
4109 * Called before PATH is changed. The argument is the new value of PATH;
4110 * pathval() still returns the old value at this point.
4111 * Called with interrupts off.
4115 changepath(const char *newval)
4117 const char *old, *new;
4124 firstchange = 9999; /* assume no change */
4130 if ((*old == '\0' && *new == ':')
4131 || (*old == ':' && *new == '\0'))
4133 old = new; /* ignore subsequent differences */
4137 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
4144 if (builtinloc < 0 && idx_bltin >= 0)
4145 builtinloc = idx_bltin; /* zap builtins */
4146 if (builtinloc >= 0 && idx_bltin < 0)
4148 clearcmdentry(firstchange);
4149 builtinloc = idx_bltin;
4154 * Clear out command entries. The argument specifies the first entry in
4155 * PATH which has changed.
4159 clearcmdentry(int firstchange)
4161 struct tblentry **tblp;
4162 struct tblentry **pp;
4163 struct tblentry *cmdp;
4166 for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
4168 while ((cmdp = *pp) != NULL) {
4169 if ((cmdp->cmdtype == CMDNORMAL &&
4170 cmdp->param.index >= firstchange)
4171 || (cmdp->cmdtype == CMDBUILTIN &&
4172 builtinloc >= firstchange)) {
4186 * Locate a command in the command hash table. If "add" is nonzero,
4187 * add the command to the table if it is not already present. The
4188 * variable "lastcmdentry" is set to point to the address of the link
4189 * pointing to the entry, so that delete_cmd_entry can delete the
4192 * Interrupts must be off if called with add != 0.
4195 static struct tblentry **lastcmdentry;
4198 static struct tblentry *
4199 cmdlookup(const char *name, int add)
4201 unsigned int hashval;
4203 struct tblentry *cmdp;
4204 struct tblentry **pp;
4207 hashval = (unsigned char)*p << 4;
4209 hashval += (unsigned char)*p++;
4211 pp = &cmdtable[hashval % CMDTABLESIZE];
4212 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
4213 if (equal(cmdp->cmdname, name))
4217 if (add && cmdp == NULL) {
4218 cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
4219 + strlen(name) + 1);
4221 cmdp->cmdtype = CMDUNKNOWN;
4222 strcpy(cmdp->cmdname, name);
4229 * Delete the command entry returned on the last lookup.
4233 delete_cmd_entry(void)
4235 struct tblentry *cmdp;
4238 cmdp = *lastcmdentry;
4239 *lastcmdentry = cmdp->next;
4240 if (cmdp->cmdtype == CMDFUNCTION)
4241 freefunc(cmdp->param.func);
4248 * Add a new command entry, replacing any existing command entry for
4249 * the same name - except special builtins.
4253 addcmdentry(char *name, struct cmdentry *entry)
4255 struct tblentry *cmdp;
4257 cmdp = cmdlookup(name, 1);
4258 if (cmdp->cmdtype == CMDFUNCTION) {
4259 freefunc(cmdp->param.func);
4261 cmdp->cmdtype = entry->cmdtype;
4262 cmdp->param = entry->u;
4267 * Make a copy of a parse tree.
4270 static inline struct funcnode *
4271 copyfunc(union node *n)
4276 funcblocksize = offsetof(struct funcnode, n);
4279 blocksize = funcblocksize;
4280 f = ckmalloc(blocksize + funcstringsize);
4281 funcblock = (char *) f + offsetof(struct funcnode, n);
4282 funcstring = (char *) f + blocksize;
4289 * Define a shell function.
4293 defun(char *name, union node *func)
4295 struct cmdentry entry;
4298 entry.cmdtype = CMDFUNCTION;
4299 entry.u.func = copyfunc(func);
4300 addcmdentry(name, &entry);
4306 * Delete a function if it exists.
4310 unsetfunc(const char *name)
4312 struct tblentry *cmdp;
4314 if ((cmdp = cmdlookup(name, 0)) != NULL &&
4315 cmdp->cmdtype == CMDFUNCTION)
4320 * Locate and print what a word is...
4324 #ifdef CONFIG_ASH_CMDCMD
4326 describe_command(char *command, int describe_command_verbose)
4328 #define describe_command_verbose 1
4330 describe_command(char *command)
4333 struct cmdentry entry;
4334 struct tblentry *cmdp;
4335 #ifdef CONFIG_ASH_ALIAS
4336 const struct alias *ap;
4338 const char *path = pathval();
4340 if (describe_command_verbose) {
4344 /* First look at the keywords */
4345 if (findkwd(command)) {
4346 out1str(describe_command_verbose ? " is a shell keyword" : command);
4350 #ifdef CONFIG_ASH_ALIAS
4351 /* Then look at the aliases */
4352 if ((ap = lookupalias(command, 0)) != NULL) {
4353 if (describe_command_verbose) {
4354 out1fmt(" is an alias for %s", ap->val);
4363 /* Then check if it is a tracked alias */
4364 if ((cmdp = cmdlookup(command, 0)) != NULL) {
4365 entry.cmdtype = cmdp->cmdtype;
4366 entry.u = cmdp->param;
4368 /* Finally use brute force */
4369 find_command(command, &entry, DO_ABS, path);
4372 switch (entry.cmdtype) {
4374 int j = entry.u.index;
4380 p = padvance(&path, command);
4384 if (describe_command_verbose) {
4386 (cmdp ? " a tracked alias for" : nullstr), p
4395 if (describe_command_verbose) {
4396 out1str(" is a shell function");
4403 if (describe_command_verbose) {
4404 out1fmt(" is a %sshell builtin",
4405 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
4406 "special " : nullstr
4414 if (describe_command_verbose) {
4415 out1str(": not found\n");
4421 outstr("\n", stdout);
4426 typecmd(int argc, char **argv)
4431 for (i = 1; i < argc; i++) {
4432 #ifdef CONFIG_ASH_CMDCMD
4433 err |= describe_command(argv[i], 1);
4435 err |= describe_command(argv[i]);
4441 #ifdef CONFIG_ASH_CMDCMD
4443 commandcmd(int argc, char **argv)
4451 while ((c = nextopt("pvV")) != '\0')
4453 verify |= VERIFY_VERBOSE;
4455 verify |= VERIFY_BRIEF;
4461 return describe_command(*argptr, verify - VERIFY_BRIEF);
4470 * Routines to expand arguments to commands. We have to deal with
4471 * backquotes, shell variables, and file metacharacters.
4477 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
4478 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
4479 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
4480 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
4481 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
4484 * Structure specifying which parts of the string should be searched
4485 * for IFS characters.
4489 struct ifsregion *next; /* next region in list */
4490 int begoff; /* offset of start of region */
4491 int endoff; /* offset of end of region */
4492 int nulonly; /* search for nul bytes only */
4495 /* output of current string */
4496 static char *expdest;
4497 /* list of back quote expressions */
4498 static struct nodelist *argbackq;
4499 /* first struct in list of ifs regions */
4500 static struct ifsregion ifsfirst;
4501 /* last struct in list */
4502 static struct ifsregion *ifslastp;
4503 /* holds expanded arg list */
4504 static struct arglist exparg;
4506 static void argstr(char *, int);
4507 static char *exptilde(char *, char *, int);
4508 static void expbackq(union node *, int, int);
4509 static const char *subevalvar(char *, char *, int, int, int, int, int);
4510 static char *evalvar(char *, int);
4511 static void strtodest(const char *, int, int);
4512 static void memtodest(const char *p, size_t len, int syntax, int quotes);
4513 static ssize_t varvalue(char *, int, int);
4514 static void recordregion(int, int, int);
4515 static void removerecordregions(int);
4516 static void ifsbreakup(char *, struct arglist *);
4517 static void ifsfree(void);
4518 static void expandmeta(struct strlist *, int);
4519 static int patmatch(char *, const char *);
4521 static int cvtnum(arith_t);
4522 static size_t esclen(const char *, const char *);
4523 static char *scanleft(char *, char *, char *, char *, int, int);
4524 static char *scanright(char *, char *, char *, char *, int, int);
4525 static void varunset(const char *, const char *, const char *, int)
4529 #define pmatch(a, b) !fnmatch((a), (b), 0)
4531 * Prepare a pattern for a expmeta (internal glob(3)) call.
4533 * Returns an stalloced string.
4536 static inline char *
4537 preglob(const char *pattern, int quoted, int flag) {
4538 flag |= RMESCAPE_GLOB;
4540 flag |= RMESCAPE_QUOTED;
4542 return _rmescapes((char *)pattern, flag);
4547 esclen(const char *start, const char *p) {
4550 while (p > start && *--p == CTLESC) {
4558 * Expand shell variables and backquotes inside a here document.
4562 expandhere(union node *arg, int fd)
4565 expandarg(arg, (struct arglist *)NULL, 0);
4566 bb_full_write(fd, stackblock(), expdest - (char *)stackblock());
4571 * Perform variable substitution and command substitution on an argument,
4572 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
4573 * perform splitting and file name expansion. When arglist is NULL, perform
4574 * here document expansion.
4578 expandarg(union node *arg, struct arglist *arglist, int flag)
4583 argbackq = arg->narg.backquote;
4584 STARTSTACKSTR(expdest);
4585 ifsfirst.next = NULL;
4587 argstr(arg->narg.text, flag);
4588 p = _STPUTC('\0', expdest);
4590 if (arglist == NULL) {
4591 return; /* here document expanded */
4593 p = grabstackstr(p);
4594 exparg.lastp = &exparg.list;
4598 if (flag & EXP_FULL) {
4599 ifsbreakup(p, &exparg);
4600 *exparg.lastp = NULL;
4601 exparg.lastp = &exparg.list;
4602 expandmeta(exparg.list, flag);
4604 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
4606 sp = (struct strlist *)stalloc(sizeof (struct strlist));
4609 exparg.lastp = &sp->next;
4613 *exparg.lastp = NULL;
4615 *arglist->lastp = exparg.list;
4616 arglist->lastp = exparg.lastp;
4622 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
4623 * characters to allow for further processing. Otherwise treat
4624 * $@ like $* since no splitting will be performed.
4628 argstr(char *p, int flag)
4630 static const char spclchars[] = {
4638 CTLBACKQ | CTLQUOTE,
4639 #ifdef CONFIG_ASH_MATH_SUPPORT
4644 const char *reject = spclchars;
4646 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
4647 int breakall = flag & EXP_WORD;
4652 if (!(flag & EXP_VARTILDE)) {
4654 } else if (flag & EXP_VARTILDE2) {
4659 if (flag & EXP_TILDE) {
4665 if (*q == CTLESC && (flag & EXP_QWORD))
4668 p = exptilde(p, q, flag);
4671 startloc = expdest - (char *)stackblock();
4673 length += strcspn(p + length, reject);
4675 if (c && (!(c & 0x80)
4676 #ifdef CONFIG_ASH_MATH_SUPPORT
4680 /* c == '=' || c == ':' || c == CTLENDARI */
4685 expdest = stnputs(p, length, expdest);
4686 newloc = expdest - (char *)stackblock();
4687 if (breakall && !inquotes && newloc > startloc) {
4688 recordregion(startloc, newloc, 0);
4699 if (flag & EXP_VARTILDE2) {
4703 flag |= EXP_VARTILDE2;
4708 * sort of a hack - expand tildes in variable
4709 * assignments (after the first '=' and after ':'s).
4718 case CTLENDVAR: /* ??? */
4721 /* "$@" syntax adherence hack */
4724 !memcmp(p, dolatstr, DOLATSTRLEN) &&
4725 (p[4] == CTLQUOTEMARK || (
4726 p[4] == CTLENDVAR &&
4727 p[5] == CTLQUOTEMARK
4730 p = evalvar(p + 1, flag) + 1;
4733 inquotes = !inquotes;
4746 p = evalvar(p, flag);
4750 case CTLBACKQ|CTLQUOTE:
4751 expbackq(argbackq->n, c, quotes);
4752 argbackq = argbackq->next;
4754 #ifdef CONFIG_ASH_MATH_SUPPORT
4767 exptilde(char *startp, char *p, int flag)
4773 int quotes = flag & (EXP_FULL | EXP_CASE);
4778 while ((c = *++p) != '\0') {
4785 if (flag & EXP_VARTILDE)
4795 if (*name == '\0') {
4796 home = lookupvar(homestr);
4798 if ((pw = getpwnam(name)) == NULL)
4802 if (!home || !*home)
4805 startloc = expdest - (char *)stackblock();
4806 strtodest(home, SQSYNTAX, quotes);
4807 recordregion(startloc, expdest - (char *)stackblock(), 0);
4816 removerecordregions(int endoff)
4818 if (ifslastp == NULL)
4821 if (ifsfirst.endoff > endoff) {
4822 while (ifsfirst.next != NULL) {
4823 struct ifsregion *ifsp;
4825 ifsp = ifsfirst.next->next;
4826 ckfree(ifsfirst.next);
4827 ifsfirst.next = ifsp;
4830 if (ifsfirst.begoff > endoff)
4833 ifslastp = &ifsfirst;
4834 ifsfirst.endoff = endoff;
4839 ifslastp = &ifsfirst;
4840 while (ifslastp->next && ifslastp->next->begoff < endoff)
4841 ifslastp=ifslastp->next;
4842 while (ifslastp->next != NULL) {
4843 struct ifsregion *ifsp;
4845 ifsp = ifslastp->next->next;
4846 ckfree(ifslastp->next);
4847 ifslastp->next = ifsp;
4850 if (ifslastp->endoff > endoff)
4851 ifslastp->endoff = endoff;
4855 #ifdef CONFIG_ASH_MATH_SUPPORT
4857 * Expand arithmetic expression. Backup to start of expression,
4858 * evaluate, place result in (backed up) result, adjust string position.
4871 * This routine is slightly over-complicated for
4872 * efficiency. Next we scan backwards looking for the
4873 * start of arithmetic.
4875 start = stackblock();
4882 while (*p != CTLARI) {
4886 sh_error("missing CTLARI (shouldn't happen)");
4891 esc = esclen(start, p);
4901 removerecordregions(begoff);
4910 len = cvtnum(dash_arith(p + 2));
4913 recordregion(begoff, begoff + len, 0);
4918 * Expand stuff in backwards quotes.
4922 expbackq(union node *cmd, int quoted, int quotes)
4930 int syntax = quoted? DQSYNTAX : BASESYNTAX;
4931 struct stackmark smark;
4934 setstackmark(&smark);
4936 startloc = dest - (char *)stackblock();
4938 evalbackcmd(cmd, (struct backcmd *) &in);
4939 popstackmark(&smark);
4946 memtodest(p, i, syntax, quotes);
4950 i = safe_read(in.fd, buf, sizeof buf);
4951 TRACE(("expbackq: read returns %d\n", i));
4961 back_exitstatus = waitforjob(in.jp);
4965 /* Eat all trailing newlines */
4967 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
4972 recordregion(startloc, dest - (char *)stackblock(), 0);
4973 TRACE(("evalbackq: size=%d: \"%.*s\"\n",
4974 (dest - (char *)stackblock()) - startloc,
4975 (dest - (char *)stackblock()) - startloc,
4976 stackblock() + startloc));
4981 scanleft(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
4992 const char *s = loc2;
4998 match = pmatch(str, s);
5002 if (quotes && *loc == CTLESC)
5012 scanright(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
5019 for (loc = str - 1, loc2 = rmescend; loc >= startp; loc2--) {
5022 const char *s = loc2;
5027 match = pmatch(str, s);
5034 esc = esclen(startp, loc);
5046 subevalvar(char *p, char *str, int strloc, int subtype, int startloc, int varflags, int quotes)
5050 int saveherefd = herefd;
5051 struct nodelist *saveargbackq = argbackq;
5053 char *rmesc, *rmescend;
5055 char *(*scan)(char *, char *, char *, char *, int , int);
5058 argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0);
5059 STPUTC('\0', expdest);
5060 herefd = saveherefd;
5061 argbackq = saveargbackq;
5062 startp = stackblock() + startloc;
5066 setvar(str, startp, 0);
5067 amount = startp - expdest;
5068 STADJUST(amount, expdest);
5072 varunset(p, str, startp, varflags);
5076 subtype -= VSTRIMRIGHT;
5078 if (subtype < 0 || subtype > 3)
5083 rmescend = stackblock() + strloc;
5085 rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
5086 if (rmesc != startp) {
5088 startp = stackblock() + startloc;
5092 str = stackblock() + strloc;
5093 preglob(str, varflags & VSQUOTE, 0);
5095 /* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */
5096 zero = subtype >> 1;
5097 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
5098 scan = (subtype & 1) ^ zero ? scanleft : scanright;
5100 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
5103 memmove(startp, loc, str - loc);
5104 loc = startp + (str - loc) - 1;
5107 amount = loc - expdest;
5108 STADJUST(amount, expdest);
5115 * Expand a variable, and return a pointer to the next character in the
5119 evalvar(char *p, int flag)
5132 quotes = flag & (EXP_FULL | EXP_CASE);
5134 subtype = varflags & VSTYPE;
5135 quoted = varflags & VSQUOTE;
5137 easy = (!quoted || (*var == '@' && shellparam.nparam));
5138 startloc = expdest - (char *)stackblock();
5139 p = strchr(p, '=') + 1;
5142 varlen = varvalue(var, varflags, flag);
5143 if (varflags & VSNUL)
5146 if (subtype == VSPLUS) {
5147 varlen = -1 - varlen;
5151 if (subtype == VSMINUS) {
5155 p, flag | EXP_TILDE |
5156 (quoted ? EXP_QWORD : EXP_WORD)
5165 if (subtype == VSASSIGN || subtype == VSQUESTION) {
5167 if (subevalvar(p, var, 0, subtype, startloc,
5171 * Remove any recorded regions beyond
5174 removerecordregions(startloc);
5184 if (varlen < 0 && uflag)
5185 varunset(p, var, 0, 0);
5187 if (subtype == VSLENGTH) {
5188 cvtnum(varlen > 0 ? varlen : 0);
5192 if (subtype == VSNORMAL) {
5196 recordregion(startloc, expdest - (char *)stackblock(), quoted);
5205 case VSTRIMRIGHTMAX:
5214 * Terminate the string and start recording the pattern
5217 STPUTC('\0', expdest);
5218 patloc = expdest - (char *)stackblock();
5219 if (subevalvar(p, NULL, patloc, subtype,
5220 startloc, varflags, quotes) == 0) {
5221 int amount = expdest - (
5222 (char *)stackblock() + patloc - 1
5224 STADJUST(-amount, expdest);
5226 /* Remove any recorded regions beyond start of variable */
5227 removerecordregions(startloc);
5232 if (subtype != VSNORMAL) { /* skip to end of alternative */
5235 if ((c = *p++) == CTLESC)
5237 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
5239 argbackq = argbackq->next;
5240 } else if (c == CTLVAR) {
5241 if ((*p++ & VSTYPE) != VSNORMAL)
5243 } else if (c == CTLENDVAR) {
5254 * Put a string on the stack.
5258 memtodest(const char *p, size_t len, int syntax, int quotes) {
5261 q = makestrspace(len * 2, q);
5264 int c = SC2INT(*p++);
5267 if (quotes && (SIT(c, syntax) == CCTL || SIT(c, syntax) == CBACK))
5277 strtodest(const char *p, int syntax, int quotes)
5279 memtodest(p, strlen(p), syntax, quotes);
5284 * Add the value of a specialized variable to the stack string.
5288 varvalue(char *name, int varflags, int flags)
5298 int quoted = varflags & VSQUOTE;
5299 int subtype = varflags & VSTYPE;
5300 int quotes = flags & (EXP_FULL | EXP_CASE);
5302 if (quoted && (flags & EXP_FULL))
5303 sep = 1 << CHAR_BIT;
5305 syntax = quoted ? DQSYNTAX : BASESYNTAX;
5314 num = shellparam.nparam;
5324 p = makestrspace(NOPTS, expdest);
5325 for (i = NOPTS - 1; i >= 0; i--) {
5327 USTPUTC(optletters(i), p);
5338 sep = ifsset() ? SC2INT(ifsval()[0]) : ' ';
5339 if (quotes && (SIT(sep, syntax) == CCTL || SIT(sep, syntax) == CBACK))
5342 if (!(ap = shellparam.p))
5344 while ((p = *ap++)) {
5347 partlen = strlen(p);
5350 if (!(subtype == VSPLUS || subtype == VSLENGTH))
5351 memtodest(p, partlen, syntax, quotes);
5357 if (subtype == VSPLUS || subtype == VSLENGTH) {
5379 if (num < 0 || num > shellparam.nparam)
5381 p = num ? shellparam.p[num - 1] : arg0;
5384 p = lookupvar(name);
5390 if (!(subtype == VSPLUS || subtype == VSLENGTH))
5391 memtodest(p, len, syntax, quotes);
5395 if (subtype == VSPLUS || subtype == VSLENGTH)
5396 STADJUST(-len, expdest);
5402 * Record the fact that we have to scan this region of the
5403 * string for IFS characters.
5407 recordregion(int start, int end, int nulonly)
5409 struct ifsregion *ifsp;
5411 if (ifslastp == NULL) {
5415 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
5417 ifslastp->next = ifsp;
5421 ifslastp->begoff = start;
5422 ifslastp->endoff = end;
5423 ifslastp->nulonly = nulonly;
5428 * Break the argument string into pieces based upon IFS and add the
5429 * strings to the argument list. The regions of the string to be
5430 * searched for IFS characters have been stored by recordregion.
5433 ifsbreakup(char *string, struct arglist *arglist)
5435 struct ifsregion *ifsp;
5440 const char *ifs, *realifs;
5446 if (ifslastp != NULL) {
5449 realifs = ifsset() ? ifsval() : defifs;
5452 p = string + ifsp->begoff;
5453 nulonly = ifsp->nulonly;
5454 ifs = nulonly ? nullstr : realifs;
5456 while (p < string + ifsp->endoff) {
5460 if (strchr(ifs, *p)) {
5462 ifsspc = (strchr(defifs, *p) != NULL);
5463 /* Ignore IFS whitespace at start */
5464 if (q == start && ifsspc) {
5470 sp = (struct strlist *)stalloc(sizeof *sp);
5472 *arglist->lastp = sp;
5473 arglist->lastp = &sp->next;
5477 if (p >= string + ifsp->endoff) {
5483 if (strchr(ifs, *p) == NULL ) {
5486 } else if (strchr(defifs, *p) == NULL) {
5502 } while ((ifsp = ifsp->next) != NULL);
5511 sp = (struct strlist *)stalloc(sizeof *sp);
5513 *arglist->lastp = sp;
5514 arglist->lastp = &sp->next;
5520 struct ifsregion *p;
5525 struct ifsregion *ifsp;
5531 ifsfirst.next = NULL;
5535 static void expmeta(char *, char *);
5536 static struct strlist *expsort(struct strlist *);
5537 static struct strlist *msort(struct strlist *, int);
5539 static char *expdir;
5543 expandmeta(struct strlist *str, int flag)
5545 static const char metachars[] = {
5548 /* TODO - EXP_REDIR */
5551 struct strlist **savelastp;
5557 if (!strpbrk(str->text, metachars))
5559 savelastp = exparg.lastp;
5562 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
5564 int i = strlen(str->text);
5565 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
5573 if (exparg.lastp == savelastp) {
5578 *exparg.lastp = str;
5579 rmescapes(str->text);
5580 exparg.lastp = &str->next;
5582 *exparg.lastp = NULL;
5583 *savelastp = sp = expsort(*savelastp);
5584 while (sp->next != NULL)
5586 exparg.lastp = &sp->next;
5593 * Add a file name to the list.
5597 addfname(const char *name)
5601 sp = (struct strlist *)stalloc(sizeof *sp);
5602 sp->text = sstrdup(name);
5604 exparg.lastp = &sp->next;
5609 * Do metacharacter (i.e. *, ?, [...]) expansion.
5613 expmeta(char *enddir, char *name)
5628 for (p = name; *p; p++) {
5629 if (*p == '*' || *p == '?')
5631 else if (*p == '[') {
5638 if (*q == '/' || *q == '\0')
5645 } else if (*p == '\\')
5647 else if (*p == '/') {
5654 if (metaflag == 0) { /* we've reached the end of the file name */
5655 if (enddir != expdir)
5663 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
5674 } while (p < start);
5676 if (enddir == expdir) {
5678 } else if (enddir == expdir + 1 && *expdir == '/') {
5684 if ((dirp = opendir(cp)) == NULL)
5686 if (enddir != expdir)
5688 if (*endname == 0) {
5700 while (! intpending && (dp = readdir(dirp)) != NULL) {
5701 if (dp->d_name[0] == '.' && ! matchdot)
5703 if (pmatch(start, dp->d_name)) {
5705 scopy(dp->d_name, enddir);
5708 for (p = enddir, cp = dp->d_name;
5709 (*p++ = *cp++) != '\0';)
5712 expmeta(p, endname);
5722 * Sort the results of file name expansion. It calculates the number of
5723 * strings to sort and then calls msort (short for merge sort) to do the
5727 static struct strlist *
5728 expsort(struct strlist *str)
5734 for (sp = str ; sp ; sp = sp->next)
5736 return msort(str, len);
5740 static struct strlist *
5741 msort(struct strlist *list, int len)
5743 struct strlist *p, *q = NULL;
5744 struct strlist **lpp;
5752 for (n = half ; --n >= 0 ; ) {
5756 q->next = NULL; /* terminate first half of list */
5757 q = msort(list, half); /* sort first half of list */
5758 p = msort(p, len - half); /* sort second half */
5761 #ifdef CONFIG_LOCALE_SUPPORT
5762 if (strcoll(p->text, q->text) < 0)
5764 if (strcmp(p->text, q->text) < 0)
5769 if ((p = *lpp) == NULL) {
5776 if ((q = *lpp) == NULL) {
5787 * Returns true if the pattern matches the string.
5791 patmatch(char *pattern, const char *string)
5793 return pmatch(preglob(pattern, 0, 0), string);
5798 * Remove any CTLESC characters from a string.
5802 _rmescapes(char *str, int flag)
5805 static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 };
5810 p = strpbrk(str, qchars);
5816 if (flag & RMESCAPE_ALLOC) {
5817 size_t len = p - str;
5818 size_t fulllen = len + strlen(p) + 1;
5820 if (flag & RMESCAPE_GROW) {
5821 r = makestrspace(fulllen, expdest);
5822 } else if (flag & RMESCAPE_HEAP) {
5823 r = ckmalloc(fulllen);
5825 r = stalloc(fulllen);
5829 q = mempcpy(q, str, len);
5832 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5833 globbing = flag & RMESCAPE_GLOB;
5834 notescaped = globbing;
5836 if (*p == CTLQUOTEMARK) {
5837 inquotes = ~inquotes;
5839 notescaped = globbing;
5843 /* naked back slash */
5849 if (notescaped && inquotes && *p != '/') {
5853 notescaped = globbing;
5858 if (flag & RMESCAPE_GROW) {
5860 STADJUST(q - r + 1, expdest);
5867 * See if a pattern matches in a case statement.
5871 casematch(union node *pattern, char *val)
5873 struct stackmark smark;
5876 setstackmark(&smark);
5877 argbackq = pattern->narg.backquote;
5878 STARTSTACKSTR(expdest);
5880 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
5881 STACKSTRNUL(expdest);
5882 result = patmatch(stackblock(), val);
5883 popstackmark(&smark);
5896 expdest = makestrspace(32, expdest);
5897 #ifdef CONFIG_ASH_MATH_SUPPORT_64
5898 len = fmtstr(expdest, 32, "%lld", (long long) num);
5900 len = fmtstr(expdest, 32, "%ld", num);
5902 STADJUST(len, expdest);
5907 varunset(const char *end, const char *var, const char *umsg, int varflags)
5913 msg = "parameter not set";
5915 if (*end == CTLENDVAR) {
5916 if (varflags & VSNUL)
5921 sh_error("%.*s: %s%s", end - var - 1, var, msg, tail);
5928 * This implements the input routines used by the parser.
5931 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
5933 static void pushfile(void);
5936 * Read a character from the script, returning PEOF on end of file.
5937 * Nul characters in the input are silently discarded.
5941 #define pgetc_as_macro() (--parsenleft >= 0? SC2INT(*parsenextc++) : preadbuffer())
5943 #ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
5944 #define pgetc_macro() pgetc()
5948 return pgetc_as_macro();
5951 #define pgetc_macro() pgetc_as_macro()
5955 return pgetc_macro();
5961 * Same as pgetc(), but ignores PEOA.
5963 #ifdef CONFIG_ASH_ALIAS
5964 static int pgetc2(void)
5970 } while (c == PEOA);
5974 static inline int pgetc2(void)
5976 return pgetc_macro();
5981 * Read a line from the script.
5984 static inline char *
5985 pfgets(char *line, int len)
5991 while (--nleft > 0) {
6008 #ifdef CONFIG_FEATURE_COMMAND_EDITING
6009 #ifdef CONFIG_ASH_EXPAND_PRMT
6010 static char *cmdedit_prompt;
6012 static const char *cmdedit_prompt;
6014 static inline void putprompt(const char *s)
6016 #ifdef CONFIG_ASH_EXPAND_PRMT
6017 free(cmdedit_prompt);
6018 cmdedit_prompt = bb_xstrdup(s);
6024 static inline void putprompt(const char *s)
6034 char *buf = parsefile->buf;
6038 #ifdef CONFIG_FEATURE_COMMAND_EDITING
6039 if (!iflag || parsefile->fd)
6040 nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
6042 #ifdef CONFIG_FEATURE_COMMAND_TAB_COMPLETION
6043 cmdedit_path_lookup = pathval();
6045 nr = cmdedit_read_input((char *) cmdedit_prompt, buf);
6047 /* Ctrl+C presend */
6056 if(nr < 0 && errno == 0) {
6057 /* Ctrl+D presend */
6062 nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
6066 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
6067 int flags = fcntl(0, F_GETFL, 0);
6068 if (flags >= 0 && flags & O_NONBLOCK) {
6069 flags &=~ O_NONBLOCK;
6070 if (fcntl(0, F_SETFL, flags) >= 0) {
6071 out2str("sh: turning off NDELAY mode\n");
6081 * Refill the input buffer and return the next input character:
6083 * 1) If a string was pushed back on the input, pop it;
6084 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
6085 * from a string so we can't refill the buffer, return EOF.
6086 * 3) If the is more stuff in this buffer, use it else call read to fill it.
6087 * 4) Process input up to the next newline, deleting nul characters.
6097 while (parsefile->strpush) {
6098 #ifdef CONFIG_ASH_ALIAS
6099 if (parsenleft == -1 && parsefile->strpush->ap &&
6100 parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
6105 if (--parsenleft >= 0)
6106 return SC2INT(*parsenextc++);
6108 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
6115 if ((more = preadfd()) <= 0) {
6116 parselleft = parsenleft = EOF_NLEFT;
6123 /* delete nul characters */
6131 memmove(q, q + 1, more);
6135 parsenleft = q - parsenextc - 1;
6141 parsenleft = q - parsenextc - 1;
6153 out2str(parsenextc);
6158 return SC2INT(*parsenextc++);
6162 * Undo the last call to pgetc. Only one character may be pushed back.
6163 * PEOF may be pushed back.
6174 * Push a string back onto the input at this current parsefile level.
6175 * We handle aliases this way.
6178 pushstring(char *s, void *ap)
6185 /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
6186 if (parsefile->strpush) {
6187 sp = ckmalloc(sizeof (struct strpush));
6188 sp->prev = parsefile->strpush;
6189 parsefile->strpush = sp;
6191 sp = parsefile->strpush = &(parsefile->basestrpush);
6192 sp->prevstring = parsenextc;
6193 sp->prevnleft = parsenleft;
6194 #ifdef CONFIG_ASH_ALIAS
6195 sp->ap = (struct alias *)ap;
6197 ((struct alias *)ap)->flag |= ALIASINUSE;
6209 struct strpush *sp = parsefile->strpush;
6212 #ifdef CONFIG_ASH_ALIAS
6214 if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
6215 checkkwd |= CHKALIAS;
6217 if (sp->string != sp->ap->val) {
6220 sp->ap->flag &= ~ALIASINUSE;
6221 if (sp->ap->flag & ALIASDEAD) {
6222 unalias(sp->ap->name);
6226 parsenextc = sp->prevstring;
6227 parsenleft = sp->prevnleft;
6228 /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
6229 parsefile->strpush = sp->prev;
6230 if (sp != &(parsefile->basestrpush))
6236 * Set the input to take input from a file. If push is set, push the
6237 * old input onto the stack first.
6241 setinputfile(const char *fname, int flags)
6247 if ((fd = open(fname, O_RDONLY)) < 0) {
6248 if (flags & INPUT_NOFILE_OK)
6250 sh_error("Can't open %s", fname);
6253 fd2 = copyfd(fd, 10);
6256 sh_error("Out of file descriptors");
6259 setinputfd(fd, flags & INPUT_PUSH_FILE);
6267 * Like setinputfile, but takes an open file descriptor. Call this with
6272 setinputfd(int fd, int push)
6274 (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
6280 if (parsefile->buf == NULL)
6281 parsefile->buf = ckmalloc(IBUFSIZ);
6282 parselleft = parsenleft = 0;
6288 * Like setinputfile, but takes input from a string.
6292 setinputstring(char *string)
6296 parsenextc = string;
6297 parsenleft = strlen(string);
6298 parsefile->buf = NULL;
6305 * To handle the "." command, a stack of input files is used. Pushfile
6306 * adds a new entry to the stack and popfile restores the previous level.
6312 struct parsefile *pf;
6314 parsefile->nleft = parsenleft;
6315 parsefile->lleft = parselleft;
6316 parsefile->nextc = parsenextc;
6317 parsefile->linno = plinno;
6318 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
6319 pf->prev = parsefile;
6322 pf->basestrpush.prev = NULL;
6330 struct parsefile *pf = parsefile;
6339 parsefile = pf->prev;
6341 parsenleft = parsefile->nleft;
6342 parselleft = parsefile->lleft;
6343 parsenextc = parsefile->nextc;
6344 plinno = parsefile->linno;
6350 * Return to top level.
6356 while (parsefile != &basepf)
6362 * Close the file(s) that the shell is reading commands from. Called
6363 * after a fork is done.
6370 if (parsefile->fd > 0) {
6371 close(parsefile->fd);
6378 /* mode flags for set_curjob */
6379 #define CUR_DELETE 2
6380 #define CUR_RUNNING 1
6381 #define CUR_STOPPED 0
6383 /* mode flags for dowait */
6384 #define DOWAIT_NORMAL 0
6385 #define DOWAIT_BLOCK 1
6388 static struct job *jobtab;
6390 static unsigned njobs;
6392 /* pgrp of shell on invocation */
6393 static int initialpgrp;
6394 static int ttyfd = -1;
6397 static struct job *curjob;
6398 /* number of presumed living untracked jobs */
6401 static void set_curjob(struct job *, unsigned);
6403 static int restartjob(struct job *, int);
6404 static void xtcsetpgrp(int, pid_t);
6405 static char *commandtext(union node *);
6406 static void cmdlist(union node *, int);
6407 static void cmdtxt(union node *);
6408 static void cmdputs(const char *);
6409 static void showpipe(struct job *, FILE *);
6411 static int sprint_status(char *, int, int);
6412 static void freejob(struct job *);
6413 static struct job *getjob(const char *, int);
6414 static struct job *growjobtab(void);
6415 static void forkchild(struct job *, union node *, int);
6416 static void forkparent(struct job *, union node *, int, pid_t);
6417 static int dowait(int, struct job *);
6418 static int getstatus(struct job *);
6421 set_curjob(struct job *jp, unsigned mode)
6424 struct job **jpp, **curp;
6426 /* first remove from list */
6427 jpp = curp = &curjob;
6432 jpp = &jp1->prev_job;
6434 *jpp = jp1->prev_job;
6436 /* Then re-insert in correct position */
6444 /* job being deleted */
6447 /* newly created job or backgrounded job,
6448 put after all stopped jobs. */
6452 if (!jp1 || jp1->state != JOBSTOPPED)
6455 jpp = &jp1->prev_job;
6461 /* newly stopped job - becomes curjob */
6462 jp->prev_job = *jpp;
6470 * Turn job control on and off.
6472 * Note: This code assumes that the third arg to ioctl is a character
6473 * pointer, which is true on Berkeley systems but not System V. Since
6474 * System V doesn't have job control yet, this isn't a problem now.
6476 * Called with interrupts off.
6485 if (on == jobctl || rootshell == 0)
6489 ofd = fd = open(_PATH_TTY, O_RDWR);
6492 while (!isatty(fd) && --fd >= 0)
6495 fd = fcntl(fd, F_DUPFD, 10);
6499 fcntl(fd, F_SETFD, FD_CLOEXEC);
6500 do { /* while we are in the background */
6501 if ((pgrp = tcgetpgrp(fd)) < 0) {
6503 sh_warnx("can't access tty; job control turned off");
6507 if (pgrp == getpgrp())
6518 xtcsetpgrp(fd, pgrp);
6520 /* turning job control off */
6523 xtcsetpgrp(fd, pgrp);
6537 killcmd(int argc, char **argv)
6548 "Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n"
6549 "kill -l [exitstatus]"
6553 if (**++argv == '-') {
6554 signo = decode_signal(*argv + 1, 1);
6558 while ((c = nextopt("ls:")) != '\0')
6568 signo = decode_signal(optionarg, 1);
6571 "invalid signal number or name: %s",
6582 if (!list && signo < 0)
6585 if ((signo < 0 || !*argv) ^ list) {
6593 for (i = 1; i < NSIG; i++) {
6594 name = u_signal_names(0, &i, 1);
6596 out1fmt(snlfmt, name);
6600 name = u_signal_names(*argptr, &signo, -1);
6602 out1fmt(snlfmt, name);
6604 sh_error("invalid signal number or exit status: %s", *argptr);
6610 if (**argv == '%') {
6611 jp = getjob(*argv, 0);
6612 pid = -jp->ps[0].pid;
6614 pid = **argv == '-' ?
6615 -number(*argv + 1) : number(*argv);
6617 if (kill(pid, signo) != 0) {
6618 sh_warnx("(%d) - %m", pid);
6627 #if defined(JOBS) || defined(DEBUG)
6629 jobno(const struct job *jp)
6631 return jp - jobtab + 1;
6637 fgcmd(int argc, char **argv)
6644 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
6649 jp = getjob(*argv, 1);
6650 if (mode == FORK_BG) {
6651 set_curjob(jp, CUR_RUNNING);
6652 fprintf(out, "[%d] ", jobno(jp));
6654 outstr(jp->ps->cmd, out);
6656 retval = restartjob(jp, mode);
6657 } while (*argv && *++argv);
6661 static int bgcmd(int, char **) __attribute__((__alias__("fgcmd")));
6665 restartjob(struct job *jp, int mode)
6667 struct procstat *ps;
6673 if (jp->state == JOBDONE)
6675 jp->state = JOBRUNNING;
6677 if (mode == FORK_FG)
6678 xtcsetpgrp(ttyfd, pgid);
6679 killpg(pgid, SIGCONT);
6683 if (WIFSTOPPED(ps->status)) {
6686 } while (ps++, --i);
6688 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
6695 sprint_status(char *s, int status, int sigonly)
6701 if (!WIFEXITED(status)) {
6703 if (WIFSTOPPED(status))
6704 st = WSTOPSIG(status);
6707 st = WTERMSIG(status);
6709 if (st == SIGINT || st == SIGPIPE)
6712 if (WIFSTOPPED(status))
6717 col = fmtstr(s, 32, strsignal(st));
6718 if (WCOREDUMP(status)) {
6719 col += fmtstr(s + col, 16, " (core dumped)");
6721 } else if (!sigonly) {
6722 st = WEXITSTATUS(status);
6724 col = fmtstr(s, 16, "Done(%d)", st);
6726 col = fmtstr(s, 16, "Done");
6735 showjob(FILE *out, struct job *jp, int mode)
6737 struct procstat *ps;
6738 struct procstat *psend;
6745 if (mode & SHOW_PGID) {
6746 /* just output process (group) id of pipeline */
6747 fprintf(out, "%d\n", ps->pid);
6751 col = fmtstr(s, 16, "[%d] ", jobno(jp));
6756 else if (curjob && jp == curjob->prev_job)
6759 if (mode & SHOW_PID)
6760 col += fmtstr(s + col, 16, "%d ", ps->pid);
6762 psend = ps + jp->nprocs;
6764 if (jp->state == JOBRUNNING) {
6765 scopy("Running", s + col);
6766 col += strlen("Running");
6768 int status = psend[-1].status;
6770 if (jp->state == JOBSTOPPED)
6771 status = jp->stopstatus;
6773 col += sprint_status(s + col, status, 0);
6779 /* for each process */
6780 col = fmtstr(s, 48, " |\n%*c%d ", indent, ' ', ps->pid) - 3;
6783 fprintf(out, "%s%*c%s",
6784 s, 33 - col >= 0 ? 33 - col : 0, ' ', ps->cmd
6786 if (!(mode & SHOW_PID)) {
6790 if (++ps == psend) {
6791 outcslow('\n', out);
6798 if (jp->state == JOBDONE) {
6799 TRACE(("showjob: freeing job %d\n", jobno(jp)));
6806 jobscmd(int argc, char **argv)
6812 while ((m = nextopt("lp")))
6822 showjob(out, getjob(*argv,0), mode);
6825 showjobs(out, mode);
6832 * Print a list of jobs. If "change" is nonzero, only print jobs whose
6833 * statuses have changed since the last call to showjobs.
6837 showjobs(FILE *out, int mode)
6841 TRACE(("showjobs(%x) called\n", mode));
6843 /* If not even one one job changed, there is nothing to do */
6844 while (dowait(DOWAIT_NORMAL, NULL) > 0)
6847 for (jp = curjob; jp; jp = jp->prev_job) {
6848 if (!(mode & SHOW_CHANGED) || jp->changed)
6849 showjob(out, jp, mode);
6855 * Mark a job structure as unused.
6859 freejob(struct job *jp)
6861 struct procstat *ps;
6865 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
6866 if (ps->cmd != nullstr)
6869 if (jp->ps != &jp->ps0)
6872 set_curjob(jp, CUR_DELETE);
6878 waitcmd(int argc, char **argv)
6891 /* wait for all jobs */
6896 /* no running procs */
6899 if (jp->state == JOBRUNNING)
6904 dowait(DOWAIT_BLOCK, 0);
6910 if (**argv != '%') {
6911 pid_t pid = number(*argv);
6915 if (job->ps[job->nprocs - 1].pid == pid)
6917 job = job->prev_job;
6923 job = getjob(*argv, 0);
6924 /* loop until process terminated or stopped */
6925 while (job->state == JOBRUNNING)
6926 dowait(DOWAIT_BLOCK, 0);
6928 retval = getstatus(job);
6939 * Convert a job name to a job structure.
6943 getjob(const char *name, int getctl)
6947 const char *err_msg = "No such job: %s";
6951 char *(*match)(const char *, const char *);
6966 if (c == '+' || c == '%') {
6968 err_msg = "No current job";
6970 } else if (c == '-') {
6973 err_msg = "No previous job";
6984 jp = jobtab + num - 1;
7001 if (match(jp->ps[0].cmd, p)) {
7005 err_msg = "%s: ambiguous";
7012 err_msg = "job %s not created under job control";
7013 if (getctl && jp->jobctl == 0)
7018 sh_error(err_msg, name);
7023 * Return a new job structure.
7024 * Called with interrupts off.
7028 makejob(union node *node, int nprocs)
7033 for (i = njobs, jp = jobtab ; ; jp++) {
7040 if (jp->state != JOBDONE || !jp->waited)
7049 memset(jp, 0, sizeof(*jp));
7054 jp->prev_job = curjob;
7059 jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
7061 TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
7071 struct job *jp, *jq;
7073 len = njobs * sizeof(*jp);
7075 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
7077 offset = (char *)jp - (char *)jq;
7079 /* Relocate pointers */
7082 jq = (struct job *)((char *)jq + l);
7086 #define joff(p) ((struct job *)((char *)(p) + l))
7087 #define jmove(p) (p) = (void *)((char *)(p) + offset)
7088 if (xlikely(joff(jp)->ps == &jq->ps0))
7089 jmove(joff(jp)->ps);
7090 if (joff(jp)->prev_job)
7091 jmove(joff(jp)->prev_job);
7101 jp = (struct job *)((char *)jp + len);
7105 } while (--jq >= jp);
7111 * Fork off a subshell. If we are doing job control, give the subshell its
7112 * own process group. Jp is a job structure that the job is to be added to.
7113 * N is the command that will be evaluated by the child. Both jp and n may
7114 * be NULL. The mode parameter can be one of the following:
7115 * FORK_FG - Fork off a foreground process.
7116 * FORK_BG - Fork off a background process.
7117 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
7118 * process group even if job control is on.
7120 * When job control is turned off, background processes have their standard
7121 * input redirected to /dev/null (except for the second and later processes
7124 * Called with interrupts off.
7128 forkchild(struct job *jp, union node *n, int mode)
7132 TRACE(("Child shell %d\n", getpid()));
7139 /* do job control only in root shell */
7141 if (mode != FORK_NOJOB && jp->jobctl && !oldlvl) {
7144 if (jp->nprocs == 0)
7147 pgrp = jp->ps[0].pid;
7148 /* This can fail because we are doing it in the parent also */
7149 (void)setpgid(0, pgrp);
7150 if (mode == FORK_FG)
7151 xtcsetpgrp(ttyfd, pgrp);
7156 if (mode == FORK_BG) {
7159 if (jp->nprocs == 0) {
7161 if (open(bb_dev_null, O_RDONLY) != 0)
7162 sh_error("Can't open %s", bb_dev_null);
7165 if (!oldlvl && iflag) {
7170 for (jp = curjob; jp; jp = jp->prev_job)
7176 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
7178 TRACE(("In parent shell: child = %d\n", pid));
7180 while (jobless && dowait(DOWAIT_NORMAL, 0) > 0);
7185 if (mode != FORK_NOJOB && jp->jobctl) {
7188 if (jp->nprocs == 0)
7191 pgrp = jp->ps[0].pid;
7192 /* This can fail because we are doing it in the child also */
7193 (void)setpgid(pid, pgrp);
7196 if (mode == FORK_BG) {
7197 backgndpid = pid; /* set $! */
7198 set_curjob(jp, CUR_RUNNING);
7201 struct procstat *ps = &jp->ps[jp->nprocs++];
7207 ps->cmd = commandtext(n);
7213 forkshell(struct job *jp, union node *n, int mode)
7217 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
7220 TRACE(("Fork failed, errno=%d", errno));
7223 sh_error("Cannot fork");
7226 forkchild(jp, n, mode);
7228 forkparent(jp, n, mode, pid);
7233 * Wait for job to finish.
7235 * Under job control we have the problem that while a child process is
7236 * running interrupts generated by the user are sent to the child but not
7237 * to the shell. This means that an infinite loop started by an inter-
7238 * active user may be hard to kill. With job control turned off, an
7239 * interactive user may place an interactive program inside a loop. If
7240 * the interactive program catches interrupts, the user doesn't want
7241 * these interrupts to also abort the loop. The approach we take here
7242 * is to have the shell ignore interrupt signals while waiting for a
7243 * foreground process to terminate, and then send itself an interrupt
7244 * signal if the child process was terminated by an interrupt signal.
7245 * Unfortunately, some programs want to do a bit of cleanup and then
7246 * exit on interrupt; unless these processes terminate themselves by
7247 * sending a signal to themselves (instead of calling exit) they will
7248 * confuse this approach.
7250 * Called with interrupts off.
7254 waitforjob(struct job *jp)
7258 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
7259 while (jp->state == JOBRUNNING) {
7260 dowait(DOWAIT_BLOCK, jp);
7265 xtcsetpgrp(ttyfd, rootpid);
7267 * This is truly gross.
7268 * If we're doing job control, then we did a TIOCSPGRP which
7269 * caused us (the shell) to no longer be in the controlling
7270 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
7271 * intuit from the subprocess exit status whether a SIGINT
7272 * occurred, and if so interrupt ourselves. Yuck. - mycroft
7277 if (jp->state == JOBDONE)
7285 * Do a wait system call. If job control is compiled in, we accept
7286 * stopped processes. If block is zero, we return a value of zero
7287 * rather than blocking.
7289 * System V doesn't have a non-blocking wait system call. It does
7290 * have a SIGCLD signal that is sent to a process when one of it's
7291 * children dies. The obvious way to use SIGCLD would be to install
7292 * a handler for SIGCLD which simply bumped a counter when a SIGCLD
7293 * was received, and have waitproc bump another counter when it got
7294 * the status of a process. Waitproc would then know that a wait
7295 * system call would not block if the two counters were different.
7296 * This approach doesn't work because if a process has children that
7297 * have not been waited for, System V will send it a SIGCLD when it
7298 * installs a signal handler for SIGCLD. What this means is that when
7299 * a child exits, the shell will be sent SIGCLD signals continuously
7300 * until is runs out of stack space, unless it does a wait call before
7301 * restoring the signal handler. The code below takes advantage of
7302 * this (mis)feature by installing a signal handler for SIGCLD and
7303 * then checking to see whether it was called. If there are any
7304 * children to be waited for, it will be.
7306 * If neither SYSV nor BSD is defined, we don't implement nonblocking
7307 * waits at all. In this case, the user will not be informed when
7308 * a background process until the next time she runs a real program
7309 * (as opposed to running a builtin command or just typing return),
7310 * and the jobs command may give out of date information.
7314 waitproc(int block, int *status)
7324 return wait3(status, flags, (struct rusage *)NULL);
7328 * Wait for a process to terminate.
7332 dowait(int block, struct job *job)
7337 struct job *thisjob;
7340 TRACE(("dowait(%d) called\n", block));
7341 pid = waitproc(block, &status);
7342 TRACE(("wait returns pid %d, status=%d\n", pid, status));
7347 for (jp = curjob; jp; jp = jp->prev_job) {
7348 struct procstat *sp;
7349 struct procstat *spend;
7350 if (jp->state == JOBDONE)
7353 spend = jp->ps + jp->nprocs;
7356 if (sp->pid == pid) {
7357 TRACE(("Job %d: changing status of proc %d from 0x%x to 0x%x\n", jobno(jp), pid, sp->status, status));
7358 sp->status = status;
7361 if (sp->status == -1)
7364 if (state == JOBRUNNING)
7366 if (WIFSTOPPED(sp->status)) {
7367 jp->stopstatus = sp->status;
7371 } while (++sp < spend);
7376 if (!WIFSTOPPED(status))
7383 if (state != JOBRUNNING) {
7384 thisjob->changed = 1;
7386 if (thisjob->state != state) {
7387 TRACE(("Job %d: changing state from %d to %d\n", jobno(thisjob), thisjob->state, state));
7388 thisjob->state = state;
7390 if (state == JOBSTOPPED) {
7391 set_curjob(thisjob, CUR_STOPPED);
7400 if (thisjob && thisjob == job) {
7404 len = sprint_status(s, status, 1);
7416 * return 1 if there are stopped jobs, otherwise 0
7429 if (jp && jp->state == JOBSTOPPED) {
7430 out2str("You have stopped jobs.\n");
7440 * Return a string identifying a command (to be printed by the
7445 static char *cmdnextc;
7448 commandtext(union node *n)
7452 STARTSTACKSTR(cmdnextc);
7454 name = stackblock();
7455 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
7456 name, cmdnextc, cmdnextc));
7457 return savestr(name);
7461 cmdtxt(union node *n)
7464 struct nodelist *lp;
7476 lp = n->npipe.cmdlist;
7494 cmdtxt(n->nbinary.ch1);
7510 cmdtxt(n->nif.test);
7513 if (n->nif.elsepart) {
7516 n = n->nif.elsepart;
7532 cmdtxt(n->nbinary.ch1);
7542 cmdputs(n->nfor.var);
7544 cmdlist(n->nfor.args, 1);
7549 cmdputs(n->narg.text);
7553 cmdlist(n->ncmd.args, 1);
7554 cmdlist(n->ncmd.redirect, 0);
7567 cmdputs(n->ncase.expr->narg.text);
7569 for (np = n->ncase.cases; np; np = np->nclist.next) {
7570 cmdtxt(np->nclist.pattern);
7572 cmdtxt(np->nclist.body);
7598 s[0] = n->nfile.fd + '0';
7602 if (n->type == NTOFD || n->type == NFROMFD) {
7603 s[0] = n->ndup.dupfd + '0';
7614 cmdlist(union node *np, int sep)
7616 for (; np; np = np->narg.next) {
7620 if (sep && np->narg.next)
7626 cmdputs(const char *s)
7628 const char *p, *str;
7629 char c, cc[2] = " ";
7633 static const char vstype[VSTYPE + 1][4] = {
7634 "", "}", "-", "+", "?", "=",
7635 "%", "%%", "#", "##"
7637 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
7639 while ((c = *p++) != 0) {
7647 if ((subtype & VSTYPE) == VSLENGTH)
7651 if (!(subtype & VSQUOTE) != !(quoted & 1)) {
7658 str = "\"}" + !(quoted & 1);
7665 case CTLBACKQ+CTLQUOTE:
7668 #ifdef CONFIG_ASH_MATH_SUPPORT
7683 if ((subtype & VSTYPE) != VSNORMAL)
7685 str = vstype[subtype & VSTYPE];
7686 if (subtype & VSNUL)
7695 /* These can only happen inside quotes */
7708 while ((c = *str++)) {
7713 USTPUTC('"', nextc);
7721 showpipe(struct job *jp, FILE *out)
7723 struct procstat *sp;
7724 struct procstat *spend;
7726 spend = jp->ps + jp->nprocs;
7727 for (sp = jp->ps + 1; sp < spend; sp++)
7728 fprintf(out, " | %s", sp->cmd);
7729 outcslow('\n', out);
7734 xtcsetpgrp(int fd, pid_t pgrp)
7736 if (tcsetpgrp(fd, pgrp))
7737 sh_error("Cannot set tty process group (%m)");
7742 getstatus(struct job *job) {
7746 status = job->ps[job->nprocs - 1].status;
7747 retval = WEXITSTATUS(status);
7748 if (!WIFEXITED(status)) {
7750 retval = WSTOPSIG(status);
7751 if (!WIFSTOPPED(status))
7754 /* XXX: limits number of signals */
7755 retval = WTERMSIG(status);
7757 if (retval == SIGINT)
7763 TRACE(("getstatus: job %d, nproc %d, status %x, retval %x\n",
7764 jobno(job), job->nprocs, status, retval));
7768 #ifdef CONFIG_ASH_MAIL
7772 * Routines to check for mail. (Perhaps make part of main.c?)
7775 #define MAXMBOXES 10
7777 /* times of mailboxes */
7778 static time_t mailtime[MAXMBOXES];
7779 /* Set if MAIL or MAILPATH is changed. */
7780 static int mail_var_path_changed;
7785 * Print appropriate message(s) if mail has arrived.
7786 * If mail_var_path_changed is set,
7787 * then the value of MAIL has mail_var_path_changed,
7788 * so we just update the values.
7798 struct stackmark smark;
7801 setstackmark(&smark);
7802 mpath = mpathset() ? mpathval() : mailval();
7803 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
7804 p = padvance(&mpath, nullstr);
7809 for (q = p ; *q ; q++);
7814 q[-1] = '\0'; /* delete trailing '/' */
7815 if (stat(p, &statb) < 0) {
7819 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
7822 pathopt ? pathopt : "you have mail"
7825 *mtp = statb.st_mtime;
7827 mail_var_path_changed = 0;
7828 popstackmark(&smark);
7833 changemail(const char *val)
7835 mail_var_path_changed++;
7838 #endif /* CONFIG_ASH_MAIL */
7844 static short profile_buf[16384];
7848 static int isloginsh;
7850 static void read_profile(const char *);
7853 * Main routine. We initialize things, parse the arguments, execute
7854 * profiles if we're a login shell, and then call cmdloop to execute
7855 * commands. The setjmp call sets up the location to jump to when an
7856 * exception occurs. When an exception occurs the variable "state"
7857 * is used to figure out how far we had gotten.
7861 ash_main(int argc, char **argv)
7865 struct jmploc jmploc;
7866 struct stackmark smark;
7869 dash_errno = __errno_location();
7873 monitor(4, etext, profile_buf, sizeof profile_buf, 50);
7876 if (setjmp(jmploc.loc)) {
7886 if (e == EXEXIT || s == 0 || iflag == 0 || shlvl)
7890 outcslow('\n', stderr);
7892 popstackmark(&smark);
7893 FORCEINTON; /* enable interrupts */
7906 trputs("Shell args: "); trargs(argv);
7910 #ifdef CONFIG_ASH_RANDOM_SUPPORT
7911 rseed = rootpid + ((time_t)time((time_t *)0));
7914 setstackmark(&smark);
7915 procargs(argc, argv);
7916 #ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
7918 const char *hp = lookupvar("HISTFILE");
7921 hp = lookupvar("HOME");
7923 char *defhp = concat_path_file(hp, ".ash_history");
7924 setvar("HISTFILE", defhp, 0);
7930 if (argv[0] && argv[0][0] == '-')
7934 read_profile("/etc/profile");
7937 read_profile(".profile");
7943 getuid() == geteuid() && getgid() == getegid() &&
7947 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
7948 read_profile(shinit);
7954 evalstring(minusc, 0);
7956 if (sflag || minusc == NULL) {
7957 #ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
7959 const char *hp = lookupvar("HISTFILE");
7962 load_history ( hp );
7965 state4: /* XXX ??? - why isn't this before the "if" statement */
7973 extern void _mcleanup(void);
7983 * Read and execute commands. "Top" is nonzero for the top level command
7984 * loop; it turns on prompting if the shell is interactive.
7991 struct stackmark smark;
7995 TRACE(("cmdloop(%d) called\n", top));
7999 setstackmark(&smark);
8002 showjobs(stderr, SHOW_CHANGED);
8007 #ifdef CONFIG_ASH_MAIL
8011 n = parsecmd(inter);
8012 /* showtree(n); DEBUG */
8014 if (!top || numeof >= 50)
8016 if (!stoppedjobs()) {
8019 out2str("\nUse \"exit\" to leave shell.\n");
8022 } else if (nflag == 0) {
8023 job_warning = (job_warning == 2) ? 1 : 0;
8027 popstackmark(&smark);
8032 return skip & SKIPEVAL;
8041 * Read /etc/profile or .profile. Return on error.
8045 read_profile(const char *name)
8049 if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0)
8061 * Read a file containing shell functions.
8065 readcmdfile(char *name)
8067 setinputfile(name, INPUT_PUSH_FILE);
8074 * Take commands from a file. To be compatible we should do a path
8075 * search for the file, which is necessary to find sub-commands.
8078 static inline char *
8079 find_dot_file(char *name)
8082 const char *path = pathval();
8085 /* don't try this for absolute or relative paths */
8086 if (strchr(name, '/'))
8089 while ((fullname = padvance(&path, name)) != NULL) {
8090 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
8092 * Don't bother freeing here, since it will
8093 * be freed by the caller.
8097 stunalloc(fullname);
8100 /* not found in the PATH */
8101 sh_error(not_found_msg, name);
8105 static int dotcmd(int argc, char **argv)
8108 volatile struct shparam saveparam;
8111 for (sp = cmdenviron; sp; sp = sp->next)
8112 setvareq(bb_xstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
8114 if (argc >= 2) { /* That's what SVR2 does */
8117 fullname = find_dot_file(argv[1]);
8120 saveparam = shellparam;
8121 shellparam.malloc = 0;
8122 shellparam.nparam = argc - 2;
8123 shellparam.p = argv + 2;
8126 setinputfile(fullname, INPUT_PUSH_FILE);
8127 commandname = fullname;
8132 freeparam(&shellparam);
8133 shellparam = saveparam;
8135 status = exitstatus;
8142 exitcmd(int argc, char **argv)
8147 exitstatus = number(argv[1]);
8152 #ifdef CONFIG_ASH_BUILTIN_ECHO
8154 echocmd(int argc, char **argv)
8156 return bb_echo(argc, argv);
8160 #ifdef CONFIG_ASH_BUILTIN_TEST
8162 testcmd(int argc, char **argv)
8164 return bb_test(argc, argv);
8171 * Same for malloc, realloc, but returns an error when out of space.
8175 ckrealloc(pointer p, size_t nbytes)
8177 p = realloc(p, nbytes);
8179 sh_error(bb_msg_memory_exhausted);
8184 ckmalloc(size_t nbytes)
8186 return ckrealloc(NULL, nbytes);
8190 * Make a copy of a string in safe storage.
8194 savestr(const char *s)
8196 char *p = strdup(s);
8198 sh_error(bb_msg_memory_exhausted);
8204 * Parse trees for commands are allocated in lifo order, so we use a stack
8205 * to make this more efficient, and also to avoid all sorts of exception
8206 * handling code to handle interrupts in the middle of a parse.
8208 * The size 504 was chosen because the Ultrix malloc handles that size
8214 stalloc(size_t nbytes)
8219 aligned = SHELL_ALIGN(nbytes);
8220 if (aligned > stacknleft) {
8223 struct stack_block *sp;
8225 blocksize = aligned;
8226 if (blocksize < MINSIZE)
8227 blocksize = MINSIZE;
8228 len = sizeof(struct stack_block) - MINSIZE + blocksize;
8229 if (len < blocksize)
8230 sh_error(bb_msg_memory_exhausted);
8234 stacknxt = sp->space;
8235 stacknleft = blocksize;
8236 sstrend = stacknxt + blocksize;
8241 stacknxt += aligned;
8242 stacknleft -= aligned;
8248 stunalloc(pointer p)
8251 if (!p || (stacknxt < (char *)p) || ((char *)p < stackp->space)) {
8252 write(2, "stunalloc\n", 10);
8256 stacknleft += stacknxt - (char *)p;
8262 setstackmark(struct stackmark *mark)
8264 mark->stackp = stackp;
8265 mark->stacknxt = stacknxt;
8266 mark->stacknleft = stacknleft;
8267 mark->marknext = markp;
8273 popstackmark(struct stackmark *mark)
8275 struct stack_block *sp;
8278 markp = mark->marknext;
8279 while (stackp != mark->stackp) {
8284 stacknxt = mark->stacknxt;
8285 stacknleft = mark->stacknleft;
8286 sstrend = mark->stacknxt + mark->stacknleft;
8292 * When the parser reads in a string, it wants to stick the string on the
8293 * stack and only adjust the stack pointer when it knows how big the
8294 * string is. Stackblock (defined in stack.h) returns a pointer to a block
8295 * of space on top of the stack and stackblocklen returns the length of
8296 * this block. Growstackblock will grow this space by at least one byte,
8297 * possibly moving it (like realloc). Grabstackblock actually allocates the
8298 * part of the block that has been used.
8302 growstackblock(void)
8306 newlen = stacknleft * 2;
8307 if (newlen < stacknleft)
8308 sh_error(bb_msg_memory_exhausted);
8312 if (stacknxt == stackp->space && stackp != &stackbase) {
8313 struct stack_block *oldstackp;
8314 struct stackmark *xmark;
8315 struct stack_block *sp;
8316 struct stack_block *prevstackp;
8322 prevstackp = sp->prev;
8323 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
8324 sp = ckrealloc((pointer)sp, grosslen);
8325 sp->prev = prevstackp;
8327 stacknxt = sp->space;
8328 stacknleft = newlen;
8329 sstrend = sp->space + newlen;
8332 * Stack marks pointing to the start of the old block
8333 * must be relocated to point to the new block
8336 while (xmark != NULL && xmark->stackp == oldstackp) {
8337 xmark->stackp = stackp;
8338 xmark->stacknxt = stacknxt;
8339 xmark->stacknleft = stacknleft;
8340 xmark = xmark->marknext;
8344 char *oldspace = stacknxt;
8345 int oldlen = stacknleft;
8346 char *p = stalloc(newlen);
8348 /* free the space we just allocated */
8349 stacknxt = memcpy(p, oldspace, oldlen);
8350 stacknleft += newlen;
8355 grabstackblock(size_t len)
8357 len = SHELL_ALIGN(len);
8363 * The following routines are somewhat easier to use than the above.
8364 * The user declares a variable of type STACKSTR, which may be declared
8365 * to be a register. The macro STARTSTACKSTR initializes things. Then
8366 * the user uses the macro STPUTC to add characters to the string. In
8367 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
8368 * grown as necessary. When the user is done, she can just leave the
8369 * string there and refer to it using stackblock(). Or she can allocate
8370 * the space for it using grabstackstr(). If it is necessary to allow
8371 * someone else to use the stack temporarily and then continue to grow
8372 * the string, the user should use grabstack to allocate the space, and
8373 * then call ungrabstr(p) to return to the previous mode of operation.
8375 * USTPUTC is like STPUTC except that it doesn't check for overflow.
8376 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
8377 * is space for at least one character.
8383 size_t len = stackblocksize();
8384 if (herefd >= 0 && len >= 1024) {
8385 bb_full_write(herefd, stackblock(), len);
8386 return stackblock();
8389 return stackblock() + len;
8393 * Called from CHECKSTRSPACE.
8397 makestrspace(size_t newlen, char *p)
8399 size_t len = p - stacknxt;
8400 size_t size = stackblocksize();
8405 size = stackblocksize();
8407 if (nleft >= newlen)
8411 return stackblock() + len;
8415 stnputs(const char *s, size_t n, char *p)
8417 p = makestrspace(n, p);
8418 p = mempcpy(p, s, n);
8423 stputs(const char *s, char *p)
8425 return stnputs(s, strlen(s), p);
8433 * number(s) Convert a string of digits to an integer.
8434 * is_number(s) Return true if s is a string of digits.
8438 * prefix -- see if pfx is a prefix of string.
8442 prefix(const char *string, const char *pfx)
8445 if (*pfx++ != *string++)
8448 return (char *) string;
8453 * Convert a string of digits to an integer, printing an error message on
8458 number(const char *s)
8462 sh_error(illnum, s);
8468 * Check for a valid number. This should be elsewhere.
8472 is_number(const char *p)
8477 } while (*++p != '\0');
8483 * Produce a possibly single quoted string suitable as input to the shell.
8484 * The return string is allocated on the stack.
8488 single_quote(const char *s) {
8497 len = strchrnul(s, '\'') - s;
8499 q = p = makestrspace(len + 3, p);
8502 q = mempcpy(q, s, len);
8508 len = strspn(s, "'");
8512 q = p = makestrspace(len + 3, p);
8515 q = mempcpy(q, s, len);
8524 return stackblock();
8528 * Like strdup but works with the ash stack.
8532 sstrdup(const char *p)
8534 size_t len = strlen(p) + 1;
8535 return memcpy(stalloc(len), p, len);
8540 calcsize(union node *n)
8544 funcblocksize += nodesize[n->type];
8547 calcsize(n->ncmd.redirect);
8548 calcsize(n->ncmd.args);
8549 calcsize(n->ncmd.assign);
8552 sizenodelist(n->npipe.cmdlist);
8557 calcsize(n->nredir.redirect);
8558 calcsize(n->nredir.n);
8565 calcsize(n->nbinary.ch2);
8566 calcsize(n->nbinary.ch1);
8569 calcsize(n->nif.elsepart);
8570 calcsize(n->nif.ifpart);
8571 calcsize(n->nif.test);
8574 funcstringsize += strlen(n->nfor.var) + 1;
8575 calcsize(n->nfor.body);
8576 calcsize(n->nfor.args);
8579 calcsize(n->ncase.cases);
8580 calcsize(n->ncase.expr);
8583 calcsize(n->nclist.body);
8584 calcsize(n->nclist.pattern);
8585 calcsize(n->nclist.next);
8589 sizenodelist(n->narg.backquote);
8590 funcstringsize += strlen(n->narg.text) + 1;
8591 calcsize(n->narg.next);
8598 calcsize(n->nfile.fname);
8599 calcsize(n->nfile.next);
8603 calcsize(n->ndup.vname);
8604 calcsize(n->ndup.next);
8608 calcsize(n->nhere.doc);
8609 calcsize(n->nhere.next);
8612 calcsize(n->nnot.com);
8619 sizenodelist(struct nodelist *lp)
8622 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8630 copynode(union node *n)
8637 funcblock = (char *) funcblock + nodesize[n->type];
8640 new->ncmd.redirect = copynode(n->ncmd.redirect);
8641 new->ncmd.args = copynode(n->ncmd.args);
8642 new->ncmd.assign = copynode(n->ncmd.assign);
8645 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8646 new->npipe.backgnd = n->npipe.backgnd;
8651 new->nredir.redirect = copynode(n->nredir.redirect);
8652 new->nredir.n = copynode(n->nredir.n);
8659 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8660 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8663 new->nif.elsepart = copynode(n->nif.elsepart);
8664 new->nif.ifpart = copynode(n->nif.ifpart);
8665 new->nif.test = copynode(n->nif.test);
8668 new->nfor.var = nodesavestr(n->nfor.var);
8669 new->nfor.body = copynode(n->nfor.body);
8670 new->nfor.args = copynode(n->nfor.args);
8673 new->ncase.cases = copynode(n->ncase.cases);
8674 new->ncase.expr = copynode(n->ncase.expr);
8677 new->nclist.body = copynode(n->nclist.body);
8678 new->nclist.pattern = copynode(n->nclist.pattern);
8679 new->nclist.next = copynode(n->nclist.next);
8683 new->narg.backquote = copynodelist(n->narg.backquote);
8684 new->narg.text = nodesavestr(n->narg.text);
8685 new->narg.next = copynode(n->narg.next);
8692 new->nfile.fname = copynode(n->nfile.fname);
8693 new->nfile.fd = n->nfile.fd;
8694 new->nfile.next = copynode(n->nfile.next);
8698 new->ndup.vname = copynode(n->ndup.vname);
8699 new->ndup.dupfd = n->ndup.dupfd;
8700 new->ndup.fd = n->ndup.fd;
8701 new->ndup.next = copynode(n->ndup.next);
8705 new->nhere.doc = copynode(n->nhere.doc);
8706 new->nhere.fd = n->nhere.fd;
8707 new->nhere.next = copynode(n->nhere.next);
8710 new->nnot.com = copynode(n->nnot.com);
8713 new->type = n->type;
8718 static struct nodelist *
8719 copynodelist(struct nodelist *lp)
8721 struct nodelist *start;
8722 struct nodelist **lpp;
8727 funcblock = (char *) funcblock +
8728 SHELL_ALIGN(sizeof(struct nodelist));
8729 (*lpp)->n = copynode(lp->n);
8731 lpp = &(*lpp)->next;
8739 nodesavestr(char *s)
8741 char *rtn = funcstring;
8743 funcstring = stpcpy(funcstring, s) + 1;
8749 * Free a parse tree.
8753 freefunc(struct funcnode *f)
8755 if (f && --f->count < 0)
8760 static void options(int);
8761 static void setoption(int, int);
8765 * Process the shell command line arguments.
8769 procargs(int argc, char **argv)
8772 const char *xminusc;
8779 for (i = 0; i < NOPTS; i++)
8785 if (*xargv == NULL) {
8787 sh_error(bb_msg_requires_arg, "-c");
8790 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
8794 for (i = 0; i < NOPTS; i++)
8795 if (optlist[i] == 2)
8800 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
8805 } else if (!sflag) {
8806 setinputfile(*xargv, 0);
8812 shellparam.p = xargv;
8813 #ifdef CONFIG_ASH_GETOPTS
8814 shellparam.optind = 1;
8815 shellparam.optoff = -1;
8817 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
8819 shellparam.nparam++;
8832 setinteractive(iflag);
8838 minus_o(char *name, int val)
8843 out1str("Current option settings\n");
8844 for (i = 0; i < NOPTS; i++)
8845 out1fmt("%-16s%s\n", optnames(i),
8846 optlist[i] ? "on" : "off");
8848 for (i = 0; i < NOPTS; i++)
8849 if (equal(name, optnames(i))) {
8853 sh_error("Illegal option -o %s", name);
8858 * Process shell options. The global variable argptr contains a pointer
8859 * to the argument list; we advance it past the options.
8863 options(int cmdline)
8871 while ((p = *argptr) != NULL) {
8873 if ((c = *p++) == '-') {
8875 if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
8877 /* "-" means turn off -x and -v */
8880 /* "--" means reset params */
8881 else if (*argptr == NULL)
8884 break; /* "-" or "--" terminates options */
8886 } else if (c == '+') {
8892 while ((c = *p++) != '\0') {
8893 if (c == 'c' && cmdline) {
8894 minusc = p; /* command is after shell args*/
8895 } else if (c == 'o') {
8896 minus_o(*argptr, val);
8899 } else if (cmdline && (c == '-')) { // long options
8900 if (strcmp(p, "login") == 0)
8912 setoption(int flag, int val)
8916 for (i = 0; i < NOPTS; i++)
8917 if (optletters(i) == flag) {
8921 sh_error("Illegal option -%c", flag);
8928 * Set the shell parameters.
8932 setparam(char **argv)
8938 for (nparam = 0 ; argv[nparam] ; nparam++);
8939 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
8941 *ap++ = savestr(*argv++);
8944 freeparam(&shellparam);
8945 shellparam.malloc = 1;
8946 shellparam.nparam = nparam;
8947 shellparam.p = newparam;
8948 #ifdef CONFIG_ASH_GETOPTS
8949 shellparam.optind = 1;
8950 shellparam.optoff = -1;
8956 * Free the list of positional parameters.
8960 freeparam(volatile struct shparam *param)
8964 if (param->malloc) {
8965 for (ap = param->p ; *ap ; ap++)
8974 * The shift builtin command.
8978 shiftcmd(int argc, char **argv)
8985 n = number(argv[1]);
8986 if (n > shellparam.nparam)
8987 sh_error("can't shift that many");
8989 shellparam.nparam -= n;
8990 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
8991 if (shellparam.malloc)
8995 while ((*ap2++ = *ap1++) != NULL);
8996 #ifdef CONFIG_ASH_GETOPTS
8997 shellparam.optind = 1;
8998 shellparam.optoff = -1;
9007 * The set command builtin.
9011 setcmd(int argc, char **argv)
9014 return showvars(nullstr, 0, VUNSET);
9018 if (*argptr != NULL) {
9026 #ifdef CONFIG_ASH_GETOPTS
9031 shellparam.optind = number(value);
9032 shellparam.optoff = -1;
9036 #ifdef CONFIG_LOCALE_SUPPORT
9037 static void change_lc_all(const char *value)
9039 if (value != 0 && *value != 0)
9040 setlocale(LC_ALL, value);
9043 static void change_lc_ctype(const char *value)
9045 if (value != 0 && *value != 0)
9046 setlocale(LC_CTYPE, value);
9051 #ifdef CONFIG_ASH_RANDOM_SUPPORT
9052 /* Roughly copied from bash.. */
9053 static void change_random(const char *value)
9056 /* "get", generate */
9059 rseed = rseed * 1103515245 + 12345;
9060 sprintf(buf, "%d", (unsigned int)((rseed & 32767)));
9061 /* set without recursion */
9062 setvar(vrandom.text, buf, VNOFUNC);
9063 vrandom.flags &= ~VNOFUNC;
9066 rseed = strtoul(value, (char **)NULL, 10);
9072 #ifdef CONFIG_ASH_GETOPTS
9074 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
9083 if(*param_optind < 1)
9085 optnext = optfirst + *param_optind - 1;
9087 if (*param_optind <= 1 || *optoff < 0 || strlen(optnext[-1]) < *optoff)
9090 p = optnext[-1] + *optoff;
9091 if (p == NULL || *p == '\0') {
9092 /* Current word is done, advance */
9094 if (p == NULL || *p != '-' || *++p == '\0') {
9101 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
9106 for (q = optstr; *q != c; ) {
9108 if (optstr[0] == ':') {
9111 err |= setvarsafe("OPTARG", s, 0);
9113 fprintf(stderr, "Illegal option -%c\n", c);
9114 (void) unsetvar("OPTARG");
9124 if (*p == '\0' && (p = *optnext) == NULL) {
9125 if (optstr[0] == ':') {
9128 err |= setvarsafe("OPTARG", s, 0);
9131 fprintf(stderr, "No arg for -%c option\n", c);
9132 (void) unsetvar("OPTARG");
9140 err |= setvarsafe("OPTARG", p, 0);
9143 err |= setvarsafe("OPTARG", nullstr, 0);
9146 *optoff = p ? p - *(optnext - 1) : -1;
9147 *param_optind = optnext - optfirst + 1;
9148 fmtstr(s, sizeof(s), "%d", *param_optind);
9149 err |= setvarsafe("OPTIND", s, VNOFUNC);
9152 err |= setvarsafe(optvar, s, 0);
9163 * The getopts builtin. Shellparam.optnext points to the next argument
9164 * to be processed. Shellparam.optptr points to the next character to
9165 * be processed in the current argument. If shellparam.optnext is NULL,
9166 * then it's the first time getopts has been called.
9170 getoptscmd(int argc, char **argv)
9175 sh_error("Usage: getopts optstring var [arg]");
9176 else if (argc == 3) {
9177 optbase = shellparam.p;
9178 if (shellparam.optind > shellparam.nparam + 1) {
9179 shellparam.optind = 1;
9180 shellparam.optoff = -1;
9185 if (shellparam.optind > argc - 2) {
9186 shellparam.optind = 1;
9187 shellparam.optoff = -1;
9191 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
9192 &shellparam.optoff);
9194 #endif /* CONFIG_ASH_GETOPTS */
9197 * XXX - should get rid of. have all builtins use getopt(3). the
9198 * library getopt must have the BSD extension static variable "optreset"
9199 * otherwise it can't be used within the shell safely.
9201 * Standard option processing (a la getopt) for builtin routines. The
9202 * only argument that is passed to nextopt is the option string; the
9203 * other arguments are unnecessary. It return the character, or '\0' on
9208 nextopt(const char *optstring)
9214 if ((p = optptr) == NULL || *p == '\0') {
9216 if (p == NULL || *p != '-' || *++p == '\0')
9219 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
9223 for (q = optstring ; *q != c ; ) {
9225 sh_error("Illegal option -%c", c);
9230 if (*p == '\0' && (p = *argptr++) == NULL)
9231 sh_error("No arg for -%c option", c);
9243 outstr(const char *p, FILE *file)
9268 outcslow(int c, FILE *dest)
9278 out1fmt(const char *fmt, ...)
9285 r = vprintf(fmt, ap);
9293 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
9300 ret = vsnprintf(outbuf, length, fmt, ap);
9312 * Shell command parser.
9315 #define EOFMARKLEN 79
9319 struct heredoc *next; /* next here document in list */
9320 union node *here; /* redirection node */
9321 char *eofmark; /* string indicating end of input */
9322 int striptabs; /* if set, strip leading tabs */
9327 static struct heredoc *heredoclist; /* list of here documents to read */
9330 static union node *list(int);
9331 static union node *andor(void);
9332 static union node *pipeline(void);
9333 static union node *command(void);
9334 static union node *simplecmd(void);
9335 static union node *makename(void);
9336 static void parsefname(void);
9337 static void parseheredoc(void);
9338 static char peektoken(void);
9339 static int readtoken(void);
9340 static int xxreadtoken(void);
9341 static int readtoken1(int firstc, int syntax, char *eofmark, int striptabs);
9342 static int noexpand(char *);
9343 static void synexpect(int) ATTRIBUTE_NORETURN;
9344 static void synerror(const char *) ATTRIBUTE_NORETURN;
9345 static void setprompt(int);
9351 * Read and parse a command. Returns NEOF on end of file. (NULL is a
9352 * valid parse tree indicating a blank line.)
9356 parsecmd(int interact)
9361 doprompt = interact;
9363 setprompt(doprompt);
9378 union node *n1, *n2, *n3;
9381 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9382 if (nlflag == 2 && peektoken())
9388 if (tok == TBACKGND) {
9389 if (n2->type == NPIPE) {
9390 n2->npipe.backgnd = 1;
9392 if (n2->type != NREDIR) {
9393 n3 = stalloc(sizeof(struct nredir));
9395 n3->nredir.redirect = NULL;
9398 n2->type = NBACKGND;
9405 n3 = (union node *)stalloc(sizeof (struct nbinary));
9407 n3->nbinary.ch1 = n1;
9408 n3->nbinary.ch2 = n2;
9424 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9432 pungetc(); /* push back EOF on input */
9448 union node *n1, *n2, *n3;
9453 if ((t = readtoken()) == TAND) {
9455 } else if (t == TOR) {
9461 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9463 n3 = (union node *)stalloc(sizeof (struct nbinary));
9465 n3->nbinary.ch1 = n1;
9466 n3->nbinary.ch2 = n2;
9476 union node *n1, *n2, *pipenode;
9477 struct nodelist *lp, *prev;
9481 TRACE(("pipeline: entered\n"));
9482 if (readtoken() == TNOT) {
9484 checkkwd = CHKKWD | CHKALIAS;
9488 if (readtoken() == TPIPE) {
9489 pipenode = (union node *)stalloc(sizeof (struct npipe));
9490 pipenode->type = NPIPE;
9491 pipenode->npipe.backgnd = 0;
9492 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
9493 pipenode->npipe.cmdlist = lp;
9497 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
9498 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9501 } while (readtoken() == TPIPE);
9507 n2 = (union node *)stalloc(sizeof (struct nnot));
9520 union node *n1, *n2;
9521 union node *ap, **app;
9522 union node *cp, **cpp;
9523 union node *redir, **rpp;
9530 switch (readtoken()) {
9535 n1 = (union node *)stalloc(sizeof (struct nif));
9537 n1->nif.test = list(0);
9538 if (readtoken() != TTHEN)
9540 n1->nif.ifpart = list(0);
9542 while (readtoken() == TELIF) {
9543 n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
9544 n2 = n2->nif.elsepart;
9546 n2->nif.test = list(0);
9547 if (readtoken() != TTHEN)
9549 n2->nif.ifpart = list(0);
9551 if (lasttoken == TELSE)
9552 n2->nif.elsepart = list(0);
9554 n2->nif.elsepart = NULL;
9562 n1 = (union node *)stalloc(sizeof (struct nbinary));
9563 n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
9564 n1->nbinary.ch1 = list(0);
9565 if ((got=readtoken()) != TDO) {
9566 TRACE(("expecting DO got %s %s\n", tokname(got), got == TWORD ? wordtext : ""));
9569 n1->nbinary.ch2 = list(0);
9574 if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
9575 synerror("Bad for loop variable");
9576 n1 = (union node *)stalloc(sizeof (struct nfor));
9578 n1->nfor.var = wordtext;
9579 checkkwd = CHKKWD | CHKALIAS;
9580 if (readtoken() == TIN) {
9582 while (readtoken() == TWORD) {
9583 n2 = (union node *)stalloc(sizeof (struct narg));
9585 n2->narg.text = wordtext;
9586 n2->narg.backquote = backquotelist;
9588 app = &n2->narg.next;
9592 if (lasttoken != TNL && lasttoken != TSEMI)
9595 n2 = (union node *)stalloc(sizeof (struct narg));
9597 n2->narg.text = (char *)dolatstr;
9598 n2->narg.backquote = NULL;
9599 n2->narg.next = NULL;
9602 * Newline or semicolon here is optional (but note
9603 * that the original Bourne shell only allowed NL).
9605 if (lasttoken != TNL && lasttoken != TSEMI)
9608 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9609 if (readtoken() != TDO)
9611 n1->nfor.body = list(0);
9615 n1 = (union node *)stalloc(sizeof (struct ncase));
9617 if (readtoken() != TWORD)
9619 n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
9621 n2->narg.text = wordtext;
9622 n2->narg.backquote = backquotelist;
9623 n2->narg.next = NULL;
9625 checkkwd = CHKKWD | CHKALIAS;
9626 } while (readtoken() == TNL);
9627 if (lasttoken != TIN)
9629 cpp = &n1->ncase.cases;
9631 checkkwd = CHKNL | CHKKWD;
9634 if (lasttoken == TLP)
9636 *cpp = cp = (union node *)stalloc(sizeof (struct nclist));
9638 app = &cp->nclist.pattern;
9640 *app = ap = (union node *)stalloc(sizeof (struct narg));
9642 ap->narg.text = wordtext;
9643 ap->narg.backquote = backquotelist;
9644 if (readtoken() != TPIPE)
9646 app = &ap->narg.next;
9649 ap->narg.next = NULL;
9650 if (lasttoken != TRP)
9652 cp->nclist.body = list(2);
9654 cpp = &cp->nclist.next;
9656 checkkwd = CHKNL | CHKKWD;
9657 if ((t = readtoken()) != TESAC) {
9659 synexpect(TENDCASE);
9667 n1 = (union node *)stalloc(sizeof (struct nredir));
9668 n1->type = NSUBSHELL;
9669 n1->nredir.n = list(0);
9670 n1->nredir.redirect = NULL;
9683 if (readtoken() != t)
9687 /* Now check for redirection which may follow command */
9688 checkkwd = CHKKWD | CHKALIAS;
9690 while (readtoken() == TREDIR) {
9691 *rpp = n2 = redirnode;
9692 rpp = &n2->nfile.next;
9698 if (n1->type != NSUBSHELL) {
9699 n2 = (union node *)stalloc(sizeof (struct nredir));
9704 n1->nredir.redirect = redir;
9713 union node *args, **app;
9714 union node *n = NULL;
9715 union node *vars, **vpp;
9716 union node **rpp, *redir;
9726 savecheckkwd = CHKALIAS;
9728 checkkwd = savecheckkwd;
9729 switch (readtoken()) {
9731 n = (union node *)stalloc(sizeof (struct narg));
9733 n->narg.text = wordtext;
9734 n->narg.backquote = backquotelist;
9735 if (savecheckkwd && isassignment(wordtext)) {
9737 vpp = &n->narg.next;
9740 app = &n->narg.next;
9745 *rpp = n = redirnode;
9746 rpp = &n->nfile.next;
9747 parsefname(); /* read name of redirection file */
9751 args && app == &args->narg.next &&
9754 struct builtincmd *bcmd;
9757 /* We have a function */
9758 if (readtoken() != TRP)
9760 name = n->narg.text;
9762 !goodname(name) || (
9763 (bcmd = find_builtin(name)) &&
9764 IS_BUILTIN_SPECIAL(bcmd)
9767 synerror("Bad function name");
9769 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9770 n->narg.next = command();
9783 n = (union node *)stalloc(sizeof (struct ncmd));
9785 n->ncmd.args = args;
9786 n->ncmd.assign = vars;
9787 n->ncmd.redirect = redir;
9796 n = (union node *)stalloc(sizeof (struct narg));
9798 n->narg.next = NULL;
9799 n->narg.text = wordtext;
9800 n->narg.backquote = backquotelist;
9804 void fixredir(union node *n, const char *text, int err)
9806 TRACE(("Fix redir %s %d\n", text, err));
9808 n->ndup.vname = NULL;
9810 if (is_digit(text[0]) && text[1] == '\0')
9811 n->ndup.dupfd = digit_val(text[0]);
9812 else if (text[0] == '-' && text[1] == '\0')
9817 synerror("Bad fd number");
9819 n->ndup.vname = makename();
9827 union node *n = redirnode;
9829 if (readtoken() != TWORD)
9831 if (n->type == NHERE) {
9832 struct heredoc *here = heredoc;
9838 TRACE(("Here document %d\n", n->type));
9839 if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
9840 synerror("Illegal eof marker for << redirection");
9841 rmescapes(wordtext);
9842 here->eofmark = wordtext;
9844 if (heredoclist == NULL)
9847 for (p = heredoclist ; p->next ; p = p->next);
9850 } else if (n->type == NTOFD || n->type == NFROMFD) {
9851 fixredir(n, wordtext, 0);
9853 n->nfile.fname = makename();
9859 * Input any here documents.
9865 struct heredoc *here;
9875 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
9876 here->eofmark, here->striptabs);
9877 n = (union node *)stalloc(sizeof (struct narg));
9878 n->narg.type = NARG;
9879 n->narg.next = NULL;
9880 n->narg.text = wordtext;
9881 n->narg.backquote = backquotelist;
9882 here->here->nhere.doc = n;
9887 static char peektoken(void)
9893 return tokname_array[t][0];
9901 int alreadyseen = tokpushback;
9904 #ifdef CONFIG_ASH_ALIAS
9913 if (checkkwd & CHKNL) {
9920 if (t != TWORD || quoteflag) {
9925 * check for keywords
9927 if (checkkwd & CHKKWD) {
9928 const char *const *pp;
9930 if ((pp = findkwd(wordtext))) {
9931 lasttoken = t = pp - tokname_array;
9932 TRACE(("keyword %s recognized\n", tokname(t)));
9937 if (checkkwd & CHKALIAS) {
9938 #ifdef CONFIG_ASH_ALIAS
9940 if ((ap = lookupalias(wordtext, 1)) != NULL) {
9942 pushstring(ap->val, ap);
9952 TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
9954 TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
9961 * Read the next input token.
9962 * If the token is a word, we set backquotelist to the list of cmds in
9963 * backquotes. We set quoteflag to true if any part of the word was
9965 * If the token is TREDIR, then we set redirnode to a structure containing
9967 * In all cases, the variable startlinno is set to the number of the line
9968 * on which the token starts.
9970 * [Change comment: here documents and internal procedures]
9971 * [Readtoken shouldn't have any arguments. Perhaps we should make the
9972 * word parsing code into a separate routine. In this case, readtoken
9973 * doesn't need to have any internal procedures, but parseword does.
9974 * We could also make parseoperator in essence the main routine, and
9975 * have parseword (readtoken1?) handle both words and redirection.]
9978 #define NEW_xxreadtoken
9979 #ifdef NEW_xxreadtoken
9981 /* singles must be first! */
9982 static const char xxreadtoken_chars[7] = { '\n', '(', ')', '&', '|', ';', 0 };
9984 static const char xxreadtoken_tokens[] = {
9985 TNL, TLP, TRP, /* only single occurrence allowed */
9986 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
9987 TEOF, /* corresponds to trailing nul */
9988 TAND, TOR, TENDCASE, /* if double occurrence */
9991 #define xxreadtoken_doubles \
9992 (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
9993 #define xxreadtoken_singles \
9994 (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
9996 static int xxreadtoken()
10007 startlinno = plinno;
10008 for (;;) { /* until token or start of word found */
10011 if ((c != ' ') && (c != '\t')
10012 #ifdef CONFIG_ASH_ALIAS
10017 while ((c = pgetc()) != '\n' && c != PEOF);
10019 } else if (c == '\\') {
10020 if (pgetc() != '\n') {
10024 startlinno = ++plinno;
10029 = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
10034 needprompt = doprompt;
10037 p = strchr(xxreadtoken_chars, c);
10040 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
10043 if (p - xxreadtoken_chars >= xxreadtoken_singles) {
10044 if (pgetc() == *p) { /* double occurrence? */
10045 p += xxreadtoken_doubles + 1;
10052 return lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
10060 #define RETURN(token) return lasttoken = token
10074 startlinno = plinno;
10075 for (;;) { /* until token or start of word found */
10078 case ' ': case '\t':
10079 #ifdef CONFIG_ASH_ALIAS
10084 while ((c = pgetc()) != '\n' && c != PEOF);
10088 if (pgetc() == '\n') {
10089 startlinno = ++plinno;
10098 needprompt = doprompt;
10103 if (pgetc() == '&')
10108 if (pgetc() == '|')
10113 if (pgetc() == ';')
10126 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
10129 #endif /* NEW_xxreadtoken */
10133 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10134 * is not NULL, read a here document. In the latter case, eofmark is the
10135 * word which marks the end of the document and striptabs is true if
10136 * leading tabs should be stripped from the document. The argument firstc
10137 * is the first character of the input token or document.
10139 * Because C does not have internal subroutines, I have simulated them
10140 * using goto's to implement the subroutine linkage. The following macros
10141 * will run code that appears at the end of readtoken1.
10144 #define CHECKEND() {goto checkend; checkend_return:;}
10145 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10146 #define PARSESUB() {goto parsesub; parsesub_return:;}
10147 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10148 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10149 #define PARSEARITH() {goto parsearith; parsearith_return:;}
10152 readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
10157 char line[EOFMARKLEN + 1];
10158 struct nodelist *bqlist = 0;
10161 int varnest = 0; /* levels of variables expansion */
10162 int arinest = 0; /* levels of arithmetic expansion */
10163 int parenlevel = 0; /* levels of parens in arithmetic */
10164 int dqvarnest = 0; /* levels of variables expansion within double quotes */
10166 int prevsyntax = 0; /* syntax before arithmetic */
10168 /* Avoid longjmp clobbering */
10174 (void) &parenlevel;
10177 (void) &prevsyntax;
10181 startlinno = plinno;
10183 if (syntax == DQSYNTAX)
10192 STARTSTACKSTR(out);
10193 loop: { /* for each line, until end of word */
10194 CHECKEND(); /* set c to PEOF if at end of here document */
10195 for (;;) { /* until end of line or end of word */
10196 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
10197 switch(SIT(c, syntax)) {
10198 case CNL: /* '\n' */
10199 if (syntax == BASESYNTAX)
10200 goto endword; /* exit outer loop */
10206 goto loop; /* continue outer loop */
10211 if (eofmark == NULL || dblquote)
10212 USTPUTC(CTLESC, out);
10215 case CBACK: /* backslash */
10218 USTPUTC(CTLESC, out);
10219 USTPUTC('\\', out);
10221 } else if (c == '\n') {
10226 c != '\\' && c != '`' &&
10231 USTPUTC(CTLESC, out);
10232 USTPUTC('\\', out);
10234 if (SIT(c, SQSYNTAX) == CCTL)
10235 USTPUTC(CTLESC, out);
10243 if (eofmark == NULL) {
10244 USTPUTC(CTLQUOTEMARK, out);
10252 if (eofmark != NULL && arinest == 0 &&
10256 if (dqvarnest == 0) {
10257 syntax = BASESYNTAX;
10264 case CVAR: /* '$' */
10265 PARSESUB(); /* parse substitution */
10267 case CENDVAR: /* '}' */
10270 if (dqvarnest > 0) {
10273 USTPUTC(CTLENDVAR, out);
10278 #ifdef CONFIG_ASH_MATH_SUPPORT
10279 case CLP: /* '(' in arithmetic */
10283 case CRP: /* ')' in arithmetic */
10284 if (parenlevel > 0) {
10288 if (pgetc() == ')') {
10289 if (--arinest == 0) {
10290 USTPUTC(CTLENDARI, out);
10291 syntax = prevsyntax;
10292 if (syntax == DQSYNTAX)
10300 * unbalanced parens
10301 * (don't 2nd guess - no error)
10309 case CBQUOTE: /* '`' */
10313 goto endword; /* exit outer loop */
10318 goto endword; /* exit outer loop */
10319 #ifdef CONFIG_ASH_ALIAS
10329 #ifdef CONFIG_ASH_MATH_SUPPORT
10330 if (syntax == ARISYNTAX)
10331 synerror("Missing '))'");
10333 if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
10334 synerror("Unterminated quoted string");
10335 if (varnest != 0) {
10336 startlinno = plinno;
10338 synerror("Missing '}'");
10340 USTPUTC('\0', out);
10341 len = out - (char *)stackblock();
10342 out = stackblock();
10343 if (eofmark == NULL) {
10344 if ((c == '>' || c == '<')
10347 && (*out == '\0' || is_digit(*out))) {
10349 return lasttoken = TREDIR;
10354 quoteflag = quotef;
10355 backquotelist = bqlist;
10356 grabstackblock(len);
10358 return lasttoken = TWORD;
10359 /* end of readtoken routine */
10364 * Check to see whether we are at the end of the here document. When this
10365 * is called, c is set to the first character of the next input line. If
10366 * we are at the end of the here document, this routine sets the c to PEOF.
10371 #ifdef CONFIG_ASH_ALIAS
10377 while (c == '\t') {
10381 if (c == *eofmark) {
10382 if (pfgets(line, sizeof line) != NULL) {
10386 for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
10387 if (*p == '\n' && *q == '\0') {
10390 needprompt = doprompt;
10392 pushstring(line, NULL);
10397 goto checkend_return;
10402 * Parse a redirection operator. The variable "out" points to a string
10403 * specifying the fd to be redirected. The variable "c" contains the
10404 * first character of the redirection operator.
10411 np = (union node *)stalloc(sizeof (struct nfile));
10416 np->type = NAPPEND;
10418 np->type = NCLOBBER;
10425 } else { /* c == '<' */
10427 switch (c = pgetc()) {
10429 if (sizeof (struct nfile) != sizeof (struct nhere)) {
10430 np = (union node *)stalloc(sizeof (struct nhere));
10434 heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
10435 heredoc->here = np;
10436 if ((c = pgetc()) == '-') {
10437 heredoc->striptabs = 1;
10439 heredoc->striptabs = 0;
10445 np->type = NFROMFD;
10449 np->type = NFROMTO;
10459 np->nfile.fd = digit_val(fd);
10461 goto parseredir_return;
10466 * Parse a substitution. At this point, we have read the dollar sign
10467 * and nothing else.
10475 static const char types[] = "}-+?=";
10479 c <= PEOA_OR_PEOF ||
10480 (c != '(' && c != '{' && !is_name(c) && !is_special(c))
10484 } else if (c == '(') { /* $(command) or $((arith)) */
10485 if (pgetc() == '(') {
10486 #ifdef CONFIG_ASH_MATH_SUPPORT
10489 synerror("We unsupport $((arith))");
10496 USTPUTC(CTLVAR, out);
10497 typeloc = out - (char *)stackblock();
10498 USTPUTC(VSNORMAL, out);
10499 subtype = VSNORMAL;
10503 if ((c = pgetc()) == '}')
10506 subtype = VSLENGTH;
10511 if (c > PEOA_OR_PEOF && is_name(c)) {
10515 } while (c > PEOA_OR_PEOF && is_in_name(c));
10516 } else if (is_digit(c)) {
10520 } while (is_digit(c));
10522 else if (is_special(c)) {
10527 badsub: synerror("Bad substitution");
10531 if (subtype == 0) {
10538 p = strchr(types, c);
10541 subtype = p - types + VSNORMAL;
10547 subtype = c == '#' ? VSTRIMLEFT :
10560 if (dblquote || arinest)
10562 *((char *)stackblock() + typeloc) = subtype | flags;
10563 if (subtype != VSNORMAL) {
10565 if (dblquote || arinest) {
10570 goto parsesub_return;
10575 * Called to parse command substitutions. Newstyle is set if the command
10576 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
10577 * list of commands (passed by reference), and savelen is the number of
10578 * characters on the top of the stack which must be preserved.
10582 struct nodelist **nlpp;
10585 char *volatile str;
10586 struct jmploc jmploc;
10587 struct jmploc *volatile savehandler;
10589 int saveprompt = 0;
10591 (void) &saveprompt;
10594 savepbq = parsebackquote;
10595 if (setjmp(jmploc.loc)) {
10598 parsebackquote = 0;
10599 handler = savehandler;
10600 longjmp(handler->loc, 1);
10604 savelen = out - (char *)stackblock();
10606 str = ckmalloc(savelen);
10607 memcpy(str, stackblock(), savelen);
10609 savehandler = handler;
10613 /* We must read until the closing backquote, giving special
10614 treatment to some slashes, and then push the string and
10615 reread it as input, interpreting it normally. */
10622 STARTSTACKSTR(pout);
10627 switch (pc = pgetc()) {
10632 if ((pc = pgetc()) == '\n') {
10637 * If eating a newline, avoid putting
10638 * the newline into the new character
10639 * stream (via the STPUTC after the
10644 if (pc != '\\' && pc != '`' && pc != '$'
10645 && (!dblquote || pc != '"'))
10646 STPUTC('\\', pout);
10647 if (pc > PEOA_OR_PEOF) {
10653 #ifdef CONFIG_ASH_ALIAS
10656 startlinno = plinno;
10657 synerror("EOF in backquote substitution");
10661 needprompt = doprompt;
10670 STPUTC('\0', pout);
10671 psavelen = pout - (char *)stackblock();
10672 if (psavelen > 0) {
10673 pstr = grabstackstr(pout);
10674 setinputstring(pstr);
10679 nlpp = &(*nlpp)->next;
10680 *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
10681 (*nlpp)->next = NULL;
10682 parsebackquote = oldstyle;
10685 saveprompt = doprompt;
10692 doprompt = saveprompt;
10694 if (readtoken() != TRP)
10701 * Start reading from old file again, ignoring any pushed back
10702 * tokens left from the backquote parsing
10707 while (stackblocksize() <= savelen)
10709 STARTSTACKSTR(out);
10711 memcpy(out, str, savelen);
10712 STADJUST(savelen, out);
10718 parsebackquote = savepbq;
10719 handler = savehandler;
10720 if (arinest || dblquote)
10721 USTPUTC(CTLBACKQ | CTLQUOTE, out);
10723 USTPUTC(CTLBACKQ, out);
10725 goto parsebackq_oldreturn;
10727 goto parsebackq_newreturn;
10730 #ifdef CONFIG_ASH_MATH_SUPPORT
10732 * Parse an arithmetic expansion (indicate start of one and set state)
10736 if (++arinest == 1) {
10737 prevsyntax = syntax;
10738 syntax = ARISYNTAX;
10739 USTPUTC(CTLARI, out);
10746 * we collapse embedded arithmetic expansion to
10747 * parenthesis, which should be equivalent
10751 goto parsearith_return;
10755 } /* end of readtoken */
10760 * Returns true if the text contains nothing to expand (no dollar signs
10765 noexpand(char *text)
10771 while ((c = *p++) != '\0') {
10772 if (c == CTLQUOTEMARK)
10776 else if (SIT(c, BASESYNTAX) == CCTL)
10784 * Return of a legal variable name (a letter or underscore followed by zero or
10785 * more letters, underscores, and digits).
10789 endofname(const char *name)
10797 if (! is_in_name(*p))
10805 * Called when an unexpected token is read during the parse. The argument
10806 * is the token that is expected, or -1 if more than one type of token can
10807 * occur at this point.
10810 static void synexpect(int token)
10815 l = sprintf(msg, "%s unexpected", tokname(lasttoken));
10817 sprintf(msg + l, " (expecting %s)", tokname(token));
10823 synerror(const char *msg)
10825 sh_error("Syntax error: %s", msg);
10831 * called by editline -- any expansions to the prompt
10832 * should be added here.
10835 #ifdef CONFIG_ASH_EXPAND_PRMT
10836 static const char *
10837 expandstr(const char *ps)
10841 /* XXX Fix (char *) cast. */
10842 setinputstring((char *)ps);
10843 readtoken1(pgetc(), DQSYNTAX, nullstr, 0);
10846 n.narg.type = NARG;
10847 n.narg.next = NULL;
10848 n.narg.text = wordtext;
10849 n.narg.backquote = backquotelist;
10851 expandarg(&n, NULL, 0);
10852 return stackblock();
10856 static void setprompt(int whichprompt)
10858 const char *prompt;
10859 #ifdef CONFIG_ASH_EXPAND_PRMT
10860 struct stackmark smark;
10865 switch (whichprompt) {
10875 #ifdef CONFIG_ASH_EXPAND_PRMT
10876 setstackmark(&smark);
10877 stalloc(stackblocksize());
10879 putprompt(expandstr(prompt));
10880 #ifdef CONFIG_ASH_EXPAND_PRMT
10881 popstackmark(&smark);
10886 static const char *const *findkwd(const char *s)
10888 return bsearch(s, tokname_array + KWDOFFSET,
10889 (sizeof(tokname_array) / sizeof(const char *)) - KWDOFFSET,
10890 sizeof(const char *), pstrcmp);
10896 * Code for dealing with input/output redirection.
10899 #define EMPTY -2 /* marks an unused slot in redirtab */
10901 # define PIPESIZE 4096 /* amount of buffering in a pipe */
10903 # define PIPESIZE PIPE_BUF
10907 * Open a file in noclobber mode.
10908 * The code was copied from bash.
10911 noclobberopen(const char *fname)
10914 struct stat finfo, finfo2;
10917 * If the file exists and is a regular file, return an error
10920 r = stat(fname, &finfo);
10921 if (r == 0 && S_ISREG(finfo.st_mode)) {
10927 * If the file was not present (r != 0), make sure we open it
10928 * exclusively so that if it is created before we open it, our open
10929 * will fail. Make sure that we do not truncate an existing file.
10930 * Note that we don't turn on O_EXCL unless the stat failed -- if the
10931 * file was not a regular file, we leave O_EXCL off.
10934 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
10935 fd = open(fname, O_WRONLY|O_CREAT, 0666);
10937 /* If the open failed, return the file descriptor right away. */
10942 * OK, the open succeeded, but the file may have been changed from a
10943 * non-regular file to a regular file between the stat and the open.
10944 * We are assuming that the O_EXCL open handles the case where FILENAME
10945 * did not exist and is symlinked to an existing file between the stat
10950 * If we can open it and fstat the file descriptor, and neither check
10951 * revealed that it was a regular file, and the file has not been
10952 * replaced, return the file descriptor.
10954 if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) &&
10955 finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
10958 /* The file has been replaced. badness. */
10965 * Handle here documents. Normally we fork off a process to write the
10966 * data to a pipe. If the document is short, we can stuff the data in
10967 * the pipe without forking.
10971 openhere(union node *redir)
10977 sh_error("Pipe call failed");
10978 if (redir->type == NHERE) {
10979 len = strlen(redir->nhere.doc->narg.text);
10980 if (len <= PIPESIZE) {
10981 bb_full_write(pip[1], redir->nhere.doc->narg.text, len);
10985 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
10987 signal(SIGINT, SIG_IGN);
10988 signal(SIGQUIT, SIG_IGN);
10989 signal(SIGHUP, SIG_IGN);
10991 signal(SIGTSTP, SIG_IGN);
10993 signal(SIGPIPE, SIG_DFL);
10994 if (redir->type == NHERE)
10995 bb_full_write(pip[1], redir->nhere.doc->narg.text, len);
10997 expandhere(redir->nhere.doc, pip[1]);
11006 openredirect(union node *redir)
11011 switch (redir->nfile.type) {
11013 fname = redir->nfile.expfname;
11014 if ((f = open(fname, O_RDONLY)) < 0)
11018 fname = redir->nfile.expfname;
11019 if ((f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
11023 /* Take care of noclobber mode. */
11025 fname = redir->nfile.expfname;
11026 if ((f = noclobberopen(fname)) < 0)
11032 fname = redir->nfile.expfname;
11033 if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
11037 fname = redir->nfile.expfname;
11038 if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
11045 /* Fall through to eliminate warning. */
11052 f = openhere(redir);
11058 sh_error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
11060 sh_error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
11064 dupredirect(union node *redir, int f)
11066 int fd = redir->nfile.fd;
11068 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
11069 if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
11070 copyfd(redir->ndup.dupfd, fd);
11083 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
11084 * old file descriptors are stashed away so that the redirection can be
11085 * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
11086 * standard output, and the standard error if it becomes a duplicate of
11087 * stdout, is saved in memory.
11091 redirect(union node *redir, int flags)
11094 struct redirtab *sv;
11105 if (flags & REDIR_PUSH) {
11106 struct redirtab *q;
11107 q = ckmalloc(sizeof (struct redirtab));
11108 q->next = redirlist;
11110 q->nullredirs = nullredirs - 1;
11111 for (i = 0 ; i < 10 ; i++)
11112 q->renamed[i] = EMPTY;
11119 if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) &&
11120 n->ndup.dupfd == fd)
11121 continue; /* redirect from/to same file descriptor */
11123 newfd = openredirect(n);
11126 if (sv && *(p = &sv->renamed[fd]) == EMPTY) {
11127 i = fcntl(fd, F_DUPFD, 10);
11134 sh_error("%d: %m", fd);
11144 dupredirect(n, newfd);
11145 } while ((n = n->nfile.next));
11147 if (flags & REDIR_SAVEFD2 && sv && sv->renamed[2] >= 0)
11148 preverrout_fd = sv->renamed[2];
11153 * Undo the effects of the last redirection.
11159 struct redirtab *rp;
11162 if (--nullredirs >= 0)
11166 for (i = 0 ; i < 10 ; i++) {
11167 if (rp->renamed[i] != EMPTY) {
11170 copyfd(rp->renamed[i], i);
11172 close(rp->renamed[i]);
11175 redirlist = rp->next;
11176 nullredirs = rp->nullredirs;
11182 * Undo all redirections. Called on error or interrupt.
11186 * Discard all saved file descriptors.
11190 clearredir(int drop)
11202 * Copy a file descriptor to be >= to. Returns -1
11203 * if the source file descriptor is closed, EMPTY if there are no unused
11204 * file descriptors left.
11208 copyfd(int from, int to)
11212 newfd = fcntl(from, F_DUPFD, to);
11214 if (errno == EMFILE)
11217 sh_error("%d: %m", from);
11224 redirectsafe(union node *redir, int flags)
11227 volatile int saveint;
11228 struct jmploc *volatile savehandler = handler;
11229 struct jmploc jmploc;
11232 if (!(err = setjmp(jmploc.loc) * 2)) {
11234 redirect(redir, flags);
11236 handler = savehandler;
11237 if (err && exception != EXERROR)
11238 longjmp(handler->loc, 1);
11239 RESTOREINT(saveint);
11246 static void shtree(union node *, int, char *, FILE*);
11247 static void shcmd(union node *, FILE *);
11248 static void sharg(union node *, FILE *);
11249 static void indent(int, char *, FILE *);
11250 static void trstring(char *);
11254 showtree(union node *n)
11256 trputs("showtree called\n");
11257 shtree(n, 1, NULL, stdout);
11262 shtree(union node *n, int ind, char *pfx, FILE *fp)
11264 struct nodelist *lp;
11270 indent(ind, pfx, fp);
11281 shtree(n->nbinary.ch1, ind, NULL, fp);
11284 shtree(n->nbinary.ch2, ind, NULL, fp);
11292 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
11297 if (n->npipe.backgnd)
11303 fprintf(fp, "<node type %d>", n->type);
11312 shcmd(union node *cmd, FILE *fp)
11320 for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
11326 for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
11329 switch (np->nfile.type) {
11330 case NTO: s = ">"; dftfd = 1; break;
11331 case NCLOBBER: s = ">|"; dftfd = 1; break;
11332 case NAPPEND: s = ">>"; dftfd = 1; break;
11333 case NTOFD: s = ">&"; dftfd = 1; break;
11334 case NFROM: s = "<"; dftfd = 0; break;
11335 case NFROMFD: s = "<&"; dftfd = 0; break;
11336 case NFROMTO: s = "<>"; dftfd = 0; break;
11337 default: s = "*error*"; dftfd = 0; break;
11339 if (np->nfile.fd != dftfd)
11340 fprintf(fp, "%d", np->nfile.fd);
11342 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
11343 fprintf(fp, "%d", np->ndup.dupfd);
11345 sharg(np->nfile.fname, fp);
11354 sharg(union node *arg, FILE *fp)
11357 struct nodelist *bqlist;
11360 if (arg->type != NARG) {
11361 out1fmt("<node type %d>\n", arg->type);
11364 bqlist = arg->narg.backquote;
11365 for (p = arg->narg.text ; *p ; p++) {
11374 if (subtype == VSLENGTH)
11380 if (subtype & VSNUL)
11383 switch (subtype & VSTYPE) {
11402 case VSTRIMLEFTMAX:
11409 case VSTRIMRIGHTMAX:
11416 out1fmt("<subtype %d>", subtype);
11423 case CTLBACKQ|CTLQUOTE:
11426 shtree(bqlist->n, -1, NULL, fp);
11438 indent(int amount, char *pfx, FILE *fp)
11442 for (i = 0 ; i < amount ; i++) {
11443 if (pfx && i == amount - 1)
11464 putc(c, tracefile);
11468 trace(const char *fmt, ...)
11475 (void) vfprintf(tracefile, fmt, va);
11480 tracev(const char *fmt, va_list va)
11484 (void) vfprintf(tracefile, fmt, va);
11489 trputs(const char *s)
11493 fputs(s, tracefile);
11505 putc('"', tracefile);
11506 for (p = s ; *p ; p++) {
11508 case '\n': c = 'n'; goto backslash;
11509 case '\t': c = 't'; goto backslash;
11510 case '\r': c = 'r'; goto backslash;
11511 case '"': c = '"'; goto backslash;
11512 case '\\': c = '\\'; goto backslash;
11513 case CTLESC: c = 'e'; goto backslash;
11514 case CTLVAR: c = 'v'; goto backslash;
11515 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
11516 case CTLBACKQ: c = 'q'; goto backslash;
11517 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
11518 backslash: putc('\\', tracefile);
11519 putc(c, tracefile);
11522 if (*p >= ' ' && *p <= '~')
11523 putc(*p, tracefile);
11525 putc('\\', tracefile);
11526 putc(*p >> 6 & 03, tracefile);
11527 putc(*p >> 3 & 07, tracefile);
11528 putc(*p & 07, tracefile);
11533 putc('"', tracefile);
11545 putc(' ', tracefile);
11547 putc('\n', tracefile);
11563 /* leave open because libedit might be using it */
11566 scopy("./trace", s);
11568 if (!freopen(s, "a", tracefile)) {
11569 fprintf(stderr, "Can't re-open %s\n", s);
11574 if ((tracefile = fopen(s, "a")) == NULL) {
11575 fprintf(stderr, "Can't open %s\n", s);
11581 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
11582 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
11584 setlinebuf(tracefile);
11585 fputs("\nTracing started.\n", tracefile);
11593 * Sigmode records the current value of the signal handlers for the various
11594 * modes. A value of zero means that the current handler is not known.
11595 * S_HARD_IGN indicates that the signal was ignored on entry to the shell,
11598 #define S_DFL 1 /* default signal handling (SIG_DFL) */
11599 #define S_CATCH 2 /* signal is caught */
11600 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
11601 #define S_HARD_IGN 4 /* signal is ignored permenantly */
11602 #define S_RESET 5 /* temporary - to reset a hard ignored sig */
11607 * The trap builtin.
11611 trapcmd(int argc, char **argv)
11620 for (signo = 0 ; signo < NSIG ; signo++) {
11621 if (trap[signo] != NULL) {
11624 sn = u_signal_names(0, &signo, 0);
11627 out1fmt("trap -- %s %s\n",
11628 single_quote(trap[signo]), sn);
11638 if ((signo = decode_signal(*ap, 0)) < 0)
11639 sh_error("%s: bad trap", *ap);
11642 if (action[0] == '-' && action[1] == '\0')
11645 action = savestr(action);
11648 ckfree(trap[signo]);
11649 trap[signo] = action;
11660 * Clear traps on a fork.
11668 for (tp = trap ; tp < &trap[NSIG] ; tp++) {
11669 if (*tp && **tp) { /* trap not NULL or SIG_IGN */
11673 if (tp != &trap[0])
11674 setsignal(tp - trap);
11682 * Set the signal handler for the specified signal. The routine figures
11683 * out what it should be set to.
11687 setsignal(int signo)
11691 struct sigaction act;
11693 if ((t = trap[signo]) == NULL)
11695 else if (*t != '\0')
11699 if (rootshell && action == S_DFL) {
11702 if (iflag || minusc || sflag == 0)
11725 t = &sigmode[signo - 1];
11729 * current setting unknown
11731 if (sigaction(signo, 0, &act) == -1) {
11733 * Pretend it worked; maybe we should give a warning
11734 * here, but other shells don't. We don't alter
11735 * sigmode, so that we retry every time.
11739 if (act.sa_handler == SIG_IGN) {
11740 if (mflag && (signo == SIGTSTP ||
11741 signo == SIGTTIN || signo == SIGTTOU)) {
11742 tsig = S_IGN; /* don't hard ignore these */
11746 tsig = S_RESET; /* force to be set */
11749 if (tsig == S_HARD_IGN || tsig == action)
11753 act.sa_handler = onsig;
11756 act.sa_handler = SIG_IGN;
11759 act.sa_handler = SIG_DFL;
11763 sigfillset(&act.sa_mask);
11764 sigaction(signo, &act, 0);
11772 ignoresig(int signo)
11774 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
11775 signal(signo, SIG_IGN);
11777 sigmode[signo - 1] = S_HARD_IGN;
11788 gotsig[signo - 1] = 1;
11789 pendingsigs = signo;
11791 if (exsig || (signo == SIGINT && !trap[SIGINT])) {
11800 * Called to execute a trap. Perhaps we should avoid entering new trap
11801 * handlers while we are executing a trap handler.
11813 savestatus = exitstatus;
11817 for (i = 0, q = gotsig; i < NSIG - 1; i++, q++) {
11825 skip = evalstring(p, SKIPEVAL);
11826 exitstatus = savestatus;
11836 * Controls whether the shell is interactive or not.
11840 setinteractive(int on)
11842 static int is_interactive;
11844 if (++on == is_interactive)
11846 is_interactive = on;
11848 setsignal(SIGQUIT);
11849 setsignal(SIGTERM);
11850 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
11851 if(is_interactive > 1) {
11852 /* Looks like they want an interactive shell */
11853 static int do_banner;
11857 "\n\n%s Built-in shell (ash)\n"
11858 "Enter 'help' for a list of built-in commands.\n\n",
11867 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
11868 /*** List the available builtins ***/
11870 static int helpcmd(int argc, char **argv)
11874 out1fmt("\nBuilt-in commands:\n-------------------\n");
11875 for (col = 0, i = 0; i < NUMBUILTINS; i++) {
11876 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
11877 builtincmd[i].name + 1);
11883 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
11885 extern const struct BB_applet applets[];
11886 extern const size_t NUM_APPLETS;
11888 for (i = 0; i < NUM_APPLETS; i++) {
11890 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), applets[i].name);
11899 return EXIT_SUCCESS;
11901 #endif /* CONFIG_FEATURE_SH_EXTRA_QUIET */
11904 * Called to exit the shell.
11914 status = exitstatus;
11915 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
11916 if (setjmp(loc.loc)) {
11917 if (exception == EXEXIT)
11922 if ((p = trap[0])) {
11928 #ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
11929 if (iflag && rootshell) {
11930 const char *hp = lookupvar("HISTFILE");
11933 save_history ( hp );
11941 static int decode_signal(const char *string, int minsig)
11944 const char *name = u_signal_names(string, &signo, minsig);
11946 return name ? signo : -1;
11951 static struct var *vartab[VTABSIZE];
11953 static int vpcmp(const void *, const void *);
11954 static struct var **findvar(struct var **, const char *);
11957 * Initialize the variable symbol tables and import the environment
11961 #ifdef CONFIG_ASH_GETOPTS
11963 * Safe version of setvar, returns 1 on success 0 on failure.
11967 setvarsafe(const char *name, const char *val, int flags)
11970 volatile int saveint;
11971 struct jmploc *volatile savehandler = handler;
11972 struct jmploc jmploc;
11975 if (setjmp(jmploc.loc))
11979 setvar(name, val, flags);
11982 handler = savehandler;
11983 RESTOREINT(saveint);
11989 * Set the value of a variable. The flags argument is ored with the
11990 * flags of the variable. If val is NULL, the variable is unset.
11994 setvar(const char *name, const char *val, int flags)
12001 q = endofname(name);
12002 p = strchrnul(q, '=');
12003 namelen = p - name;
12004 if (!namelen || p != q)
12005 sh_error("%.*s: bad variable name", namelen, name);
12010 vallen = strlen(val);
12013 p = mempcpy(nameeq = ckmalloc(namelen + vallen + 2), name, namelen);
12016 p = mempcpy(p, val, vallen);
12019 setvareq(nameeq, flags | VNOSAVE);
12025 * Same as setvar except that the variable and value are passed in
12026 * the first argument as name=value. Since the first argument will
12027 * be actually stored in the table, it should not be a string that
12029 * Called with interrupts off.
12033 setvareq(char *s, int flags)
12035 struct var *vp, **vpp;
12038 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
12039 vp = *findvar(vpp, s);
12041 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
12044 if (flags & VNOSAVE)
12047 sh_error("%.*s: is read only", strchrnul(n, '=') - n, n);
12050 if (flags & VNOSET)
12053 if (vp->func && (flags & VNOFUNC) == 0)
12054 (*vp->func)(strchrnul(s, '=') + 1);
12056 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
12059 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
12061 if (flags & VNOSET)
12064 vp = ckmalloc(sizeof (*vp));
12069 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
12077 * Process a linked list of variable assignments.
12081 listsetvar(struct strlist *list_set_var, int flags)
12083 struct strlist *lp = list_set_var;
12089 setvareq(lp->text, flags);
12090 } while ((lp = lp->next));
12096 * Find the value of a variable. Returns NULL if not set.
12100 lookupvar(const char *name)
12104 if ((v = *findvar(hashvar(name), name))) {
12107 * Dynamic variables are implemented roughly the same way they are
12108 * in bash. Namely, they're "special" so long as they aren't unset.
12109 * As soon as they're unset, they're no longer dynamic, and dynamic
12110 * lookup will no longer happen at that point. -- PFM.
12112 if((v->flags & VDYNAMIC))
12115 if(!(v->flags & VUNSET))
12116 return strchrnul(v->text, '=') + 1;
12124 * Search the environment of a builtin command.
12128 bltinlookup(const char *name)
12130 struct strlist *sp;
12132 for (sp = cmdenviron ; sp ; sp = sp->next) {
12133 if (varequal(sp->text, name))
12134 return strchrnul(sp->text, '=') + 1;
12136 return lookupvar(name);
12141 * Generate a list of variables satisfying the given conditions.
12145 listvars(int on, int off, char ***end)
12156 for (vp = *vpp ; vp ; vp = vp->next)
12157 if ((vp->flags & mask) == on) {
12158 if (ep == stackstrend())
12159 ep = growstackstr();
12160 *ep++ = (char *) vp->text;
12162 } while (++vpp < vartab + VTABSIZE);
12163 if (ep == stackstrend())
12164 ep = growstackstr();
12168 return grabstackstr(ep);
12173 * POSIX requires that 'set' (but not export or readonly) output the
12174 * variables in lexicographic order - by the locale's collating order (sigh).
12175 * Maybe we could keep them in an ordered balanced binary tree
12176 * instead of hashed lists.
12177 * For now just roll 'em through qsort for printing...
12181 showvars(const char *sep_prefix, int on, int off)
12184 char **ep, **epend;
12186 ep = listvars(on, off, &epend);
12187 qsort(ep, epend - ep, sizeof(char *), vpcmp);
12189 sep = *sep_prefix ? spcstr : sep_prefix;
12191 for (; ep < epend; ep++) {
12195 p = strchrnul(*ep, '=');
12198 q = single_quote(++p);
12200 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
12209 * The export and readonly commands.
12213 exportcmd(int argc, char **argv)
12219 int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
12222 notp = nextopt("p") - 'p';
12223 if (notp && ((name = *(aptr = argptr)))) {
12225 if ((p = strchr(name, '=')) != NULL) {
12228 if ((vp = *findvar(hashvar(name), name))) {
12233 setvar(name, p, flag);
12234 } while ((name = *++aptr) != NULL);
12236 showvars(argv[0], flag, 0);
12243 * Make a variable a local variable. When a variable is made local, it's
12244 * value and flags are saved in a localvar structure. The saved values
12245 * will be restored when the shell function returns. We handle the name
12246 * "-" as a special case.
12250 mklocal(char *name)
12252 struct localvar *lvp;
12257 lvp = ckmalloc(sizeof (struct localvar));
12258 if (name[0] == '-' && name[1] == '\0') {
12260 p = ckmalloc(sizeof(optlist));
12261 lvp->text = memcpy(p, optlist, sizeof(optlist));
12266 vpp = hashvar(name);
12267 vp = *findvar(vpp, name);
12268 eq = strchr(name, '=');
12271 setvareq(name, VSTRFIXED);
12273 setvar(name, NULL, VSTRFIXED);
12274 vp = *vpp; /* the new variable */
12275 lvp->flags = VUNSET;
12277 lvp->text = vp->text;
12278 lvp->flags = vp->flags;
12279 vp->flags |= VSTRFIXED|VTEXTFIXED;
12285 lvp->next = localvars;
12291 * The "local" command.
12295 localcmd(int argc, char **argv)
12300 while ((name = *argv++) != NULL) {
12308 * Called after a function returns.
12309 * Interrupts must be off.
12315 struct localvar *lvp;
12318 while ((lvp = localvars) != NULL) {
12319 localvars = lvp->next;
12321 TRACE(("poplocalvar %s", vp ? vp->text : "-"));
12322 if (vp == NULL) { /* $- saved */
12323 memcpy(optlist, lvp->text, sizeof(optlist));
12326 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
12327 unsetvar(vp->text);
12330 (*vp->func)(strchrnul(lvp->text, '=') + 1);
12331 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
12333 vp->flags = lvp->flags;
12334 vp->text = lvp->text;
12342 * The unset builtin command. We unset the function before we unset the
12343 * variable to allow a function to be unset when there is a readonly variable
12344 * with the same name.
12348 unsetcmd(int argc, char **argv)
12355 while ((i = nextopt("vf")) != '\0') {
12359 for (ap = argptr; *ap ; ap++) {
12374 * Unset the specified variable.
12378 unsetvar(const char *s)
12384 vpp = findvar(hashvar(s), s);
12388 int flags = vp->flags;
12391 if (flags & VREADONLY)
12394 vp->flags &= ~VDYNAMIC;
12396 if (flags & VUNSET)
12398 if ((flags & VSTRFIXED) == 0) {
12400 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
12407 vp->flags &= ~VEXPORT;
12420 * Find the appropriate entry in the hash table from the name.
12423 static struct var **
12424 hashvar(const char *p)
12426 unsigned int hashval;
12428 hashval = ((unsigned char) *p) << 4;
12429 while (*p && *p != '=')
12430 hashval += (unsigned char) *p++;
12431 return &vartab[hashval % VTABSIZE];
12437 * Compares two strings up to the first = or '\0'. The first
12438 * string must be terminated by '='; the second may be terminated by
12439 * either '=' or '\0'.
12443 varcmp(const char *p, const char *q)
12447 while ((c = *p) == (d = *q)) {
12448 if (!c || c == '=')
12462 vpcmp(const void *a, const void *b)
12464 return varcmp(*(const char **)a, *(const char **)b);
12467 static struct var **
12468 findvar(struct var **vpp, const char *name)
12470 for (; *vpp; vpp = &(*vpp)->next) {
12471 if (varequal((*vpp)->text, name)) {
12479 #include <sys/times.h>
12481 static const unsigned char timescmd_str[] = {
12482 ' ', offsetof(struct tms, tms_utime),
12483 '\n', offsetof(struct tms, tms_stime),
12484 ' ', offsetof(struct tms, tms_cutime),
12485 '\n', offsetof(struct tms, tms_cstime),
12489 static int timescmd(int ac, char **av)
12491 long int clk_tck, s, t;
12492 const unsigned char *p;
12495 clk_tck = sysconf(_SC_CLK_TCK);
12500 t = *(clock_t *)(((char *) &buf) + p[1]);
12502 out1fmt("%ldm%ld.%.3lds%c",
12504 ((t - s * clk_tck) * 1000) / clk_tck,
12506 } while (*(p += 2));
12511 #ifdef CONFIG_ASH_MATH_SUPPORT
12513 dash_arith(const char *s)
12519 result = arith(s, &errcode);
12522 sh_error("exponent less than 0");
12523 else if (errcode == -2)
12524 sh_error("divide by zero");
12525 else if (errcode == -5)
12526 sh_error("expression recursion loop detected");
12537 * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
12538 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12540 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12544 letcmd(int argc, char **argv)
12551 sh_error("expression expected");
12552 for (ap = argv + 1; *ap; ap++) {
12553 i = dash_arith(*ap);
12558 #endif /* CONFIG_ASH_MATH_SUPPORT */
12563 * Miscellaneous builtins.
12569 #if __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
12570 typedef enum __rlimit_resource rlim_t;
12576 * The read builtin. The -e option causes backslashes to escape the
12577 * following character.
12579 * This uses unbuffered input, which may be avoidable in some cases.
12583 readcmd(int argc, char **argv)
12595 #if defined(CONFIG_ASH_READ_NCHARS)
12599 struct termios tty, old_tty;
12601 #if defined(CONFIG_ASH_READ_TIMEOUT)
12605 ts.tv_sec = ts.tv_usec = 0;
12610 #if defined(CONFIG_ASH_READ_NCHARS) && defined(CONFIG_ASH_READ_TIMEOUT)
12611 while ((i = nextopt("p:rt:n:s")) != '\0')
12612 #elif defined(CONFIG_ASH_READ_NCHARS)
12613 while ((i = nextopt("p:rn:s")) != '\0')
12614 #elif defined(CONFIG_ASH_READ_TIMEOUT)
12615 while ((i = nextopt("p:rt:")) != '\0')
12617 while ((i = nextopt("p:r")) != '\0')
12622 prompt = optionarg;
12624 #if defined(CONFIG_ASH_READ_NCHARS)
12626 nchars = strtol(optionarg, &p, 10);
12628 sh_error("invalid count");
12629 nch_flag = (nchars > 0);
12635 #if defined(CONFIG_ASH_READ_TIMEOUT)
12637 ts.tv_sec = strtol(optionarg, &p, 10);
12643 ts.tv_usec = strtol(p, &p2, 10);
12645 sh_error("invalid timeout");
12647 /* normalize to usec */
12649 sh_error("invalid timeout");
12650 while (scale++ < 6)
12654 sh_error("invalid timeout");
12656 if ( ! ts.tv_sec && ! ts.tv_usec)
12657 sh_error("invalid timeout");
12667 if (prompt && isatty(0)) {
12670 if (*(ap = argptr) == NULL)
12671 sh_error("arg count");
12672 if ((ifs = bltinlookup("IFS")) == NULL)
12674 #if defined(CONFIG_ASH_READ_NCHARS)
12675 if (nch_flag || silent) {
12676 tcgetattr(0, &tty);
12679 tty.c_lflag &= ~ICANON;
12680 tty.c_cc[VMIN] = nchars;
12683 tty.c_lflag &= ~(ECHO|ECHOK|ECHONL);
12686 tcsetattr(0, TCSANOW, &tty);
12689 #if defined(CONFIG_ASH_READ_TIMEOUT)
12690 if (ts.tv_sec || ts.tv_usec) {
12694 i = select (FD_SETSIZE, &set, NULL, NULL, &ts);
12696 #if defined(CONFIG_ASH_READ_NCHARS)
12698 tcsetattr(0, TCSANOW, &old_tty);
12708 #if defined(CONFIG_ASH_READ_NCHARS)
12709 while (!nch_flag || nchars--)
12714 if (read(0, &c, 1) != 1) {
12726 if (!rflag && c == '\\') {
12732 if (startword && *ifs == ' ' && strchr(ifs, c)) {
12736 if (ap[1] != NULL && strchr(ifs, c) != NULL) {
12738 setvar(*ap, stackblock(), 0);
12747 #if defined(CONFIG_ASH_READ_NCHARS)
12748 if (nch_flag || silent)
12749 tcsetattr(0, TCSANOW, &old_tty);
12753 /* Remove trailing blanks */
12754 while ((char *)stackblock() <= --p && strchr(ifs, *p) != NULL)
12756 setvar(*ap, stackblock(), 0);
12757 while (*++ap != NULL)
12758 setvar(*ap, nullstr, 0);
12763 static int umaskcmd(int argc, char **argv)
12765 static const char permuser[3] = "ugo";
12766 static const char permmode[3] = "rwx";
12767 static const short int permmask[] = {
12768 S_IRUSR, S_IWUSR, S_IXUSR,
12769 S_IRGRP, S_IWGRP, S_IXGRP,
12770 S_IROTH, S_IWOTH, S_IXOTH
12776 int symbolic_mode = 0;
12778 while (nextopt("S") != '\0') {
12787 if ((ap = *argptr) == NULL) {
12788 if (symbolic_mode) {
12792 for (i = 0; i < 3; i++) {
12795 *p++ = permuser[i];
12797 for (j = 0; j < 3; j++) {
12798 if ((mask & permmask[3 * i + j]) == 0) {
12799 *p++ = permmode[j];
12807 out1fmt("%.4o\n", mask);
12810 if (is_digit((unsigned char) *ap)) {
12813 if (*ap >= '8' || *ap < '0')
12814 sh_error(illnum, argv[1]);
12815 mask = (mask << 3) + (*ap - '0');
12816 } while (*++ap != '\0');
12819 mask = ~mask & 0777;
12820 if (!bb_parse_mode(ap, &mask)) {
12821 sh_error("Illegal mode: %s", ap);
12823 umask(~mask & 0777);
12832 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
12833 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
12834 * ash by J.T. Conklin.
12842 int factor; /* multiply by to get rlim_{cur,max} values */
12846 static const struct limits limits[] = {
12848 { "time(seconds)", RLIMIT_CPU, 1, 't' },
12850 #ifdef RLIMIT_FSIZE
12851 { "file(blocks)", RLIMIT_FSIZE, 512, 'f' },
12854 { "data(kbytes)", RLIMIT_DATA, 1024, 'd' },
12856 #ifdef RLIMIT_STACK
12857 { "stack(kbytes)", RLIMIT_STACK, 1024, 's' },
12860 { "coredump(blocks)", RLIMIT_CORE, 512, 'c' },
12863 { "memory(kbytes)", RLIMIT_RSS, 1024, 'm' },
12865 #ifdef RLIMIT_MEMLOCK
12866 { "locked memory(kbytes)", RLIMIT_MEMLOCK, 1024, 'l' },
12868 #ifdef RLIMIT_NPROC
12869 { "process", RLIMIT_NPROC, 1, 'p' },
12871 #ifdef RLIMIT_NOFILE
12872 { "nofiles", RLIMIT_NOFILE, 1, 'n' },
12875 { "vmemory(kbytes)", RLIMIT_AS, 1024, 'v' },
12877 #ifdef RLIMIT_LOCKS
12878 { "locks", RLIMIT_LOCKS, 1, 'w' },
12880 { (char *) 0, 0, 0, '\0' }
12883 enum limtype { SOFT = 0x1, HARD = 0x2 };
12885 static void printlim(enum limtype how, const struct rlimit *limit,
12886 const struct limits *l)
12890 val = limit->rlim_max;
12892 val = limit->rlim_cur;
12894 if (val == RLIM_INFINITY)
12895 out1fmt("unlimited\n");
12898 out1fmt("%lld\n", (long long) val);
12903 ulimitcmd(int argc, char **argv)
12907 enum limtype how = SOFT | HARD;
12908 const struct limits *l;
12911 struct rlimit limit;
12914 while ((optc = nextopt("HSa"
12918 #ifdef RLIMIT_FSIZE
12924 #ifdef RLIMIT_STACK
12933 #ifdef RLIMIT_MEMLOCK
12936 #ifdef RLIMIT_NPROC
12939 #ifdef RLIMIT_NOFILE
12945 #ifdef RLIMIT_LOCKS
12963 for (l = limits; l->option != what; l++)
12966 set = *argptr ? 1 : 0;
12970 if (all || argptr[1])
12971 sh_error("too many arguments");
12972 if (strncmp(p, "unlimited\n", 9) == 0)
12973 val = RLIM_INFINITY;
12977 while ((c = *p++) >= '0' && c <= '9')
12979 val = (val * 10) + (long)(c - '0');
12980 if (val < (rlim_t) 0)
12984 sh_error("bad number");
12989 for (l = limits; l->name; l++) {
12990 getrlimit(l->cmd, &limit);
12991 out1fmt("%-20s ", l->name);
12992 printlim(how, &limit, l);
12997 getrlimit(l->cmd, &limit);
13000 limit.rlim_max = val;
13002 limit.rlim_cur = val;
13003 if (setrlimit(l->cmd, &limit) < 0)
13004 sh_error("error setting limit (%m)");
13006 printlim(how, &limit, l);
13012 #ifdef CONFIG_ASH_MATH_SUPPORT
13014 /* Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
13016 Permission is hereby granted, free of charge, to any person obtaining
13017 a copy of this software and associated documentation files (the
13018 "Software"), to deal in the Software without restriction, including
13019 without limitation the rights to use, copy, modify, merge, publish,
13020 distribute, sublicense, and/or sell copies of the Software, and to
13021 permit persons to whom the Software is furnished to do so, subject to
13022 the following conditions:
13024 The above copyright notice and this permission notice shall be
13025 included in all copies or substantial portions of the Software.
13027 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
13028 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
13029 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
13030 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
13031 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
13032 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
13033 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
13036 /* This is my infix parser/evaluator. It is optimized for size, intended
13037 * as a replacement for yacc-based parsers. However, it may well be faster
13038 * than a comparable parser written in yacc. The supported operators are
13039 * listed in #defines below. Parens, order of operations, and error handling
13040 * are supported. This code is thread safe. The exact expression format should
13041 * be that which POSIX specifies for shells. */
13043 /* The code uses a simple two-stack algorithm. See
13044 * http://www.onthenet.com.au/~grahamis/int2008/week02/lect02.html
13045 * for a detailed explanation of the infix-to-postfix algorithm on which
13046 * this is based (this code differs in that it applies operators immediately
13047 * to the stack instead of adding them to a queue to end up with an
13050 /* To use the routine, call it with an expression string and error return
13054 * Aug 24, 2001 Manuel Novoa III
13056 * Reduced the generated code size by about 30% (i386) and fixed several bugs.
13058 * 1) In arith_apply():
13059 * a) Cached values of *numptr and &(numptr[-1]).
13060 * b) Removed redundant test for zero denominator.
13063 * a) Eliminated redundant code for processing operator tokens by moving
13064 * to a table-based implementation. Also folded handling of parens
13066 * b) Combined all 3 loops which called arith_apply to reduce generated
13067 * code size at the cost of speed.
13069 * 3) The following expressions were treated as valid by the original code:
13070 * 1() , 0! , 1 ( *3 ) .
13071 * These bugs have been fixed by internally enclosing the expression in
13072 * parens and then checking that all binary ops and right parens are
13073 * preceded by a valid expression (NUM_TOKEN).
13075 * Note: It may be desirable to replace Aaron's test for whitespace with
13076 * ctype's isspace() if it is used by another busybox applet or if additional
13077 * whitespace chars should be considered. Look below the "#include"s for a
13078 * precompiler test.
13082 * Aug 26, 2001 Manuel Novoa III
13084 * Return 0 for null expressions. Pointed out by Vladimir Oleynik.
13086 * Merge in Aaron's comments previously posted to the busybox list,
13087 * modified slightly to take account of my changes to the code.
13092 * (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
13094 * - allow access to variable,
13095 * used recursive find value indirection (c=2*2; a="c"; $((a+=2)) produce 6)
13096 * - realize assign syntax (VAR=expr, +=, *= etc)
13097 * - realize exponentiation (** operator)
13098 * - realize comma separated - expr, expr
13099 * - realise ++expr --expr expr++ expr--
13100 * - realise expr ? expr : expr (but, second expr calculate always)
13101 * - allow hexadecimal and octal numbers
13102 * - was restored loses XOR operator
13103 * - remove one goto label, added three ;-)
13104 * - protect $((num num)) as true zero expr (Manuel`s error)
13105 * - always use special isspace(), see comment from bash ;-)
13109 #define arith_isspace(arithval) \
13110 (arithval == ' ' || arithval == '\n' || arithval == '\t')
13113 typedef unsigned char operator;
13115 /* An operator's token id is a bit of a bitfield. The lower 5 bits are the
13116 * precedence, and 3 high bits are an ID unique across operators of that
13117 * precedence. The ID portion is so that multiple operators can have the
13118 * same precedence, ensuring that the leftmost one is evaluated first.
13119 * Consider * and /. */
13121 #define tok_decl(prec,id) (((id)<<5)|(prec))
13122 #define PREC(op) ((op) & 0x1F)
13124 #define TOK_LPAREN tok_decl(0,0)
13126 #define TOK_COMMA tok_decl(1,0)
13128 #define TOK_ASSIGN tok_decl(2,0)
13129 #define TOK_AND_ASSIGN tok_decl(2,1)
13130 #define TOK_OR_ASSIGN tok_decl(2,2)
13131 #define TOK_XOR_ASSIGN tok_decl(2,3)
13132 #define TOK_PLUS_ASSIGN tok_decl(2,4)
13133 #define TOK_MINUS_ASSIGN tok_decl(2,5)
13134 #define TOK_LSHIFT_ASSIGN tok_decl(2,6)
13135 #define TOK_RSHIFT_ASSIGN tok_decl(2,7)
13137 #define TOK_MUL_ASSIGN tok_decl(3,0)
13138 #define TOK_DIV_ASSIGN tok_decl(3,1)
13139 #define TOK_REM_ASSIGN tok_decl(3,2)
13141 /* all assign is right associativity and precedence eq, but (7+3)<<5 > 256 */
13142 #define convert_prec_is_assing(prec) do { if(prec == 3) prec = 2; } while(0)
13144 /* conditional is right associativity too */
13145 #define TOK_CONDITIONAL tok_decl(4,0)
13146 #define TOK_CONDITIONAL_SEP tok_decl(4,1)
13148 #define TOK_OR tok_decl(5,0)
13150 #define TOK_AND tok_decl(6,0)
13152 #define TOK_BOR tok_decl(7,0)
13154 #define TOK_BXOR tok_decl(8,0)
13156 #define TOK_BAND tok_decl(9,0)
13158 #define TOK_EQ tok_decl(10,0)
13159 #define TOK_NE tok_decl(10,1)
13161 #define TOK_LT tok_decl(11,0)
13162 #define TOK_GT tok_decl(11,1)
13163 #define TOK_GE tok_decl(11,2)
13164 #define TOK_LE tok_decl(11,3)
13166 #define TOK_LSHIFT tok_decl(12,0)
13167 #define TOK_RSHIFT tok_decl(12,1)
13169 #define TOK_ADD tok_decl(13,0)
13170 #define TOK_SUB tok_decl(13,1)
13172 #define TOK_MUL tok_decl(14,0)
13173 #define TOK_DIV tok_decl(14,1)
13174 #define TOK_REM tok_decl(14,2)
13176 /* exponent is right associativity */
13177 #define TOK_EXPONENT tok_decl(15,1)
13179 /* For now unary operators. */
13180 #define UNARYPREC 16
13181 #define TOK_BNOT tok_decl(UNARYPREC,0)
13182 #define TOK_NOT tok_decl(UNARYPREC,1)
13184 #define TOK_UMINUS tok_decl(UNARYPREC+1,0)
13185 #define TOK_UPLUS tok_decl(UNARYPREC+1,1)
13187 #define PREC_PRE (UNARYPREC+2)
13189 #define TOK_PRE_INC tok_decl(PREC_PRE, 0)
13190 #define TOK_PRE_DEC tok_decl(PREC_PRE, 1)
13192 #define PREC_POST (UNARYPREC+3)
13194 #define TOK_POST_INC tok_decl(PREC_POST, 0)
13195 #define TOK_POST_DEC tok_decl(PREC_POST, 1)
13197 #define SPEC_PREC (UNARYPREC+4)
13199 #define TOK_NUM tok_decl(SPEC_PREC, 0)
13200 #define TOK_RPAREN tok_decl(SPEC_PREC, 1)
13202 #define NUMPTR (*numstackptr)
13204 static inline int tok_have_assign(operator op)
13206 operator prec = PREC(op);
13208 convert_prec_is_assing(prec);
13209 return (prec == PREC(TOK_ASSIGN) ||
13210 prec == PREC_PRE || prec == PREC_POST);
13213 static inline int is_right_associativity(operator prec)
13215 return (prec == PREC(TOK_ASSIGN) || prec == PREC(TOK_EXPONENT) ||
13216 prec == PREC(TOK_CONDITIONAL));
13220 typedef struct ARITCH_VAR_NUM {
13222 arith_t contidional_second_val;
13223 char contidional_second_val_initialized;
13224 char *var; /* if NULL then is regular number,
13225 else is variable name */
13229 typedef struct CHK_VAR_RECURSIVE_LOOPED {
13231 struct CHK_VAR_RECURSIVE_LOOPED *next;
13232 } chk_var_recursive_looped_t;
13234 static chk_var_recursive_looped_t *prev_chk_var_recursive;
13237 static int arith_lookup_val(v_n_t *t)
13240 const char * p = lookupvar(t->var);
13245 /* recursive try as expression */
13246 chk_var_recursive_looped_t *cur;
13247 chk_var_recursive_looped_t cur_save;
13249 for(cur = prev_chk_var_recursive; cur; cur = cur->next) {
13250 if(strcmp(cur->var, t->var) == 0) {
13251 /* expression recursion loop detected */
13255 /* save current lookuped var name */
13256 cur = prev_chk_var_recursive;
13257 cur_save.var = t->var;
13258 cur_save.next = cur;
13259 prev_chk_var_recursive = &cur_save;
13261 t->val = arith (p, &errcode);
13262 /* restore previous ptr after recursiving */
13263 prev_chk_var_recursive = cur;
13266 /* allow undefined var as 0 */
13273 /* "applying" a token means performing it on the top elements on the integer
13274 * stack. For a unary operator it will only change the top element, but a
13275 * binary operator will pop two arguments and push a result */
13277 arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr)
13280 arith_t numptr_val, rez;
13281 int ret_arith_lookup_val;
13283 if (NUMPTR == numstack) goto err; /* There is no operator that can work
13284 without arguments */
13285 numptr_m1 = NUMPTR - 1;
13287 /* check operand is var with noninteger value */
13288 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
13289 if(ret_arith_lookup_val)
13290 return ret_arith_lookup_val;
13292 rez = numptr_m1->val;
13293 if (op == TOK_UMINUS)
13295 else if (op == TOK_NOT)
13297 else if (op == TOK_BNOT)
13299 else if (op == TOK_POST_INC || op == TOK_PRE_INC)
13301 else if (op == TOK_POST_DEC || op == TOK_PRE_DEC)
13303 else if (op != TOK_UPLUS) {
13304 /* Binary operators */
13306 /* check and binary operators need two arguments */
13307 if (numptr_m1 == numstack) goto err;
13309 /* ... and they pop one */
13312 if (op == TOK_CONDITIONAL) {
13313 if(! numptr_m1->contidional_second_val_initialized) {
13314 /* protect $((expr1 ? expr2)) without ": expr" */
13317 rez = numptr_m1->contidional_second_val;
13318 } else if(numptr_m1->contidional_second_val_initialized) {
13319 /* protect $((expr1 : expr2)) without "expr ? " */
13322 numptr_m1 = NUMPTR - 1;
13323 if(op != TOK_ASSIGN) {
13324 /* check operand is var with noninteger value for not '=' */
13325 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
13326 if(ret_arith_lookup_val)
13327 return ret_arith_lookup_val;
13329 if (op == TOK_CONDITIONAL) {
13330 numptr_m1->contidional_second_val = rez;
13332 rez = numptr_m1->val;
13333 if (op == TOK_BOR || op == TOK_OR_ASSIGN)
13335 else if (op == TOK_OR)
13336 rez = numptr_val || rez;
13337 else if (op == TOK_BAND || op == TOK_AND_ASSIGN)
13339 else if (op == TOK_BXOR || op == TOK_XOR_ASSIGN)
13341 else if (op == TOK_AND)
13342 rez = rez && numptr_val;
13343 else if (op == TOK_EQ)
13344 rez = (rez == numptr_val);
13345 else if (op == TOK_NE)
13346 rez = (rez != numptr_val);
13347 else if (op == TOK_GE)
13348 rez = (rez >= numptr_val);
13349 else if (op == TOK_RSHIFT || op == TOK_RSHIFT_ASSIGN)
13350 rez >>= numptr_val;
13351 else if (op == TOK_LSHIFT || op == TOK_LSHIFT_ASSIGN)
13352 rez <<= numptr_val;
13353 else if (op == TOK_GT)
13354 rez = (rez > numptr_val);
13355 else if (op == TOK_LT)
13356 rez = (rez < numptr_val);
13357 else if (op == TOK_LE)
13358 rez = (rez <= numptr_val);
13359 else if (op == TOK_MUL || op == TOK_MUL_ASSIGN)
13361 else if (op == TOK_ADD || op == TOK_PLUS_ASSIGN)
13363 else if (op == TOK_SUB || op == TOK_MINUS_ASSIGN)
13365 else if (op == TOK_ASSIGN || op == TOK_COMMA)
13367 else if (op == TOK_CONDITIONAL_SEP) {
13368 if (numptr_m1 == numstack) {
13369 /* protect $((expr : expr)) without "expr ? " */
13372 numptr_m1->contidional_second_val_initialized = op;
13373 numptr_m1->contidional_second_val = numptr_val;
13375 else if (op == TOK_CONDITIONAL) {
13377 numptr_val : numptr_m1->contidional_second_val;
13379 else if(op == TOK_EXPONENT) {
13381 return -3; /* exponent less than 0 */
13386 while(numptr_val--)
13391 else if(numptr_val==0) /* zero divisor check */
13393 else if (op == TOK_DIV || op == TOK_DIV_ASSIGN)
13395 else if (op == TOK_REM || op == TOK_REM_ASSIGN)
13398 if(tok_have_assign(op)) {
13401 if(numptr_m1->var == NULL) {
13405 /* save to shell variable */
13406 #ifdef CONFIG_ASH_MATH_SUPPORT_64
13407 snprintf(buf, sizeof(buf), "%lld", arith_t_type rez);
13409 snprintf(buf, sizeof(buf), "%ld", arith_t_type rez);
13411 setvar(numptr_m1->var, buf, 0);
13412 /* after saving, make previous value for v++ or v-- */
13413 if(op == TOK_POST_INC)
13415 else if(op == TOK_POST_DEC)
13418 numptr_m1->val = rez;
13419 /* protect geting var value, is number now */
13420 numptr_m1->var = NULL;
13425 /* longest must first */
13426 static const char op_tokens[] = {
13427 '<','<','=',0, TOK_LSHIFT_ASSIGN,
13428 '>','>','=',0, TOK_RSHIFT_ASSIGN,
13429 '<','<', 0, TOK_LSHIFT,
13430 '>','>', 0, TOK_RSHIFT,
13431 '|','|', 0, TOK_OR,
13432 '&','&', 0, TOK_AND,
13433 '!','=', 0, TOK_NE,
13434 '<','=', 0, TOK_LE,
13435 '>','=', 0, TOK_GE,
13436 '=','=', 0, TOK_EQ,
13437 '|','=', 0, TOK_OR_ASSIGN,
13438 '&','=', 0, TOK_AND_ASSIGN,
13439 '*','=', 0, TOK_MUL_ASSIGN,
13440 '/','=', 0, TOK_DIV_ASSIGN,
13441 '%','=', 0, TOK_REM_ASSIGN,
13442 '+','=', 0, TOK_PLUS_ASSIGN,
13443 '-','=', 0, TOK_MINUS_ASSIGN,
13444 '-','-', 0, TOK_POST_DEC,
13445 '^','=', 0, TOK_XOR_ASSIGN,
13446 '+','+', 0, TOK_POST_INC,
13447 '*','*', 0, TOK_EXPONENT,
13451 '=', 0, TOK_ASSIGN,
13463 '?', 0, TOK_CONDITIONAL,
13464 ':', 0, TOK_CONDITIONAL_SEP,
13465 ')', 0, TOK_RPAREN,
13466 '(', 0, TOK_LPAREN,
13470 #define endexpression &op_tokens[sizeof(op_tokens)-7]
13473 static arith_t arith (const char *expr, int *perrcode)
13475 register char arithval; /* Current character under analysis */
13476 operator lasttok, op;
13479 const char *p = endexpression;
13482 size_t datasizes = strlen(expr) + 2;
13484 /* Stack of integers */
13485 /* The proof that there can be no more than strlen(startbuf)/2+1 integers
13486 * in any given correct or incorrect expression is left as an exercise to
13488 v_n_t *numstack = alloca(((datasizes)/2)*sizeof(v_n_t)),
13489 *numstackptr = numstack;
13490 /* Stack of operator tokens */
13491 operator *stack = alloca((datasizes) * sizeof(operator)),
13494 *stackptr++ = lasttok = TOK_LPAREN; /* start off with a left paren */
13495 *perrcode = errcode = 0;
13498 if ((arithval = *expr) == 0) {
13499 if (p == endexpression) {
13500 /* Null expression. */
13504 /* This is only reached after all tokens have been extracted from the
13505 * input stream. If there are still tokens on the operator stack, they
13506 * are to be applied in order. At the end, there should be a final
13507 * result on the integer stack */
13509 if (expr != endexpression + 1) {
13510 /* If we haven't done so already, */
13511 /* append a closing right paren */
13512 expr = endexpression;
13513 /* and let the loop process it. */
13516 /* At this point, we're done with the expression. */
13517 if (numstackptr != numstack+1) {
13518 /* ... but if there isn't, it's bad */
13520 return (*perrcode = -1);
13522 if(numstack->var) {
13523 /* expression is $((var)) only, lookup now */
13524 errcode = arith_lookup_val(numstack);
13527 *perrcode = errcode;
13528 return numstack->val;
13530 /* Continue processing the expression. */
13531 if (arith_isspace(arithval)) {
13532 /* Skip whitespace */
13535 if((p = endofname(expr)) != expr) {
13536 size_t var_name_size = (p-expr) + 1; /* trailing zero */
13538 numstackptr->var = alloca(var_name_size);
13539 safe_strncpy(numstackptr->var, expr, var_name_size);
13542 numstackptr->contidional_second_val_initialized = 0;
13546 } else if (is_digit(arithval)) {
13547 numstackptr->var = NULL;
13548 #ifdef CONFIG_ASH_MATH_SUPPORT_64
13549 numstackptr->val = strtoll(expr, (char **) &expr, 0);
13551 numstackptr->val = strtol(expr, (char **) &expr, 0);
13555 for(p = op_tokens; ; p++) {
13559 /* strange operator not found */
13562 for(o = expr; *p && *o == *p; p++)
13569 /* skip tail uncompared token */
13572 /* skip zero delim */
13577 /* post grammar: a++ reduce to num */
13578 if(lasttok == TOK_POST_INC || lasttok == TOK_POST_DEC)
13581 /* Plus and minus are binary (not unary) _only_ if the last
13582 * token was as number, or a right paren (which pretends to be
13583 * a number, since it evaluates to one). Think about it.
13584 * It makes sense. */
13585 if (lasttok != TOK_NUM) {
13601 /* We don't want a unary operator to cause recursive descent on the
13602 * stack, because there can be many in a row and it could cause an
13603 * operator to be evaluated before its argument is pushed onto the
13604 * integer stack. */
13605 /* But for binary operators, "apply" everything on the operator
13606 * stack until we find an operator with a lesser priority than the
13607 * one we have just extracted. */
13608 /* Left paren is given the lowest priority so it will never be
13609 * "applied" in this way.
13610 * if associativity is right and priority eq, applied also skip
13613 if ((prec > 0 && prec < UNARYPREC) || prec == SPEC_PREC) {
13614 /* not left paren or unary */
13615 if (lasttok != TOK_NUM) {
13616 /* binary op must be preceded by a num */
13619 while (stackptr != stack) {
13620 if (op == TOK_RPAREN) {
13621 /* The algorithm employed here is simple: while we don't
13622 * hit an open paren nor the bottom of the stack, pop
13623 * tokens and apply them */
13624 if (stackptr[-1] == TOK_LPAREN) {
13626 /* Any operator directly after a */
13628 /* close paren should consider itself binary */
13632 operator prev_prec = PREC(stackptr[-1]);
13634 convert_prec_is_assing(prec);
13635 convert_prec_is_assing(prev_prec);
13636 if (prev_prec < prec)
13638 /* check right assoc */
13639 if(prev_prec == prec && is_right_associativity(prec))
13642 errcode = arith_apply(*--stackptr, numstack, &numstackptr);
13643 if(errcode) goto ret;
13645 if (op == TOK_RPAREN) {
13650 /* Push this operator to the stack and remember it. */
13651 *stackptr++ = lasttok = op;
13658 #endif /* CONFIG_ASH_MATH_SUPPORT */
13662 const char *bb_applet_name = "debug stuff usage";
13663 int main(int argc, char **argv)
13665 return ash_main(argc, argv);
13670 * Copyright (c) 1989, 1991, 1993, 1994
13671 * The Regents of the University of California. All rights reserved.
13673 * This code is derived from software contributed to Berkeley by
13674 * Kenneth Almquist.
13676 * Redistribution and use in source and binary forms, with or without
13677 * modification, are permitted provided that the following conditions
13679 * 1. Redistributions of source code must retain the above copyright
13680 * notice, this list of conditions and the following disclaimer.
13681 * 2. Redistributions in binary form must reproduce the above copyright
13682 * notice, this list of conditions and the following disclaimer in the
13683 * documentation and/or other materials provided with the distribution.
13684 * 3. Neither the name of the University nor the names of its contributors
13685 * may be used to endorse or promote products derived from this software
13686 * without specific prior written permission.
13688 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13689 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13690 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13691 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13692 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13693 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13694 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13695 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13696 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13697 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF