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) 1997-2003 Herbert Xu <herbert@debian.org>
9 * was re-ported from NetBSD and debianized.
12 * This code is derived from software contributed to Berkeley by
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 * General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 * Original BSD copyright notice is retained at the end of this file.
33 * rewrite arith.y to micro stack based cryptic algorithm by
34 * Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
36 * Modified by Paul Mundt <lethal@linux-sh.org> (c) 2004 to support
39 * Modified by Vladimir Oleynik <dzo@simtreas.ru> (c) 2001-2004 to be
40 * used in busybox and size optimizations,
41 * rewrote arith (see notes to this), added locale support,
42 * rewrote dynamic variables.
48 * The follow should be set to reflect the type of system you have:
49 * JOBS -> 1 if you have Berkeley job control, 0 otherwise.
50 * define SYSV if you are running under System V.
51 * define DEBUG=1 to compile in debugging ('set -o debug' to turn on)
52 * define DEBUG=2 to compile in and turn on debugging.
54 * When debugging is on, debugging info will be written to ./trace and
55 * a quit signal will generate a core dump.
68 #include <sys/types.h>
69 #include <sys/cdefs.h>
70 #include <sys/ioctl.h>
71 #include <sys/param.h>
72 #include <sys/resource.h>
102 #ifdef CONFIG_ASH_JOB_CONTROL
108 #if JOBS || defined(CONFIG_ASH_READ_NCHARS)
116 static int *dash_errno;
118 #define errno (*dash_errno)
121 #if defined(__uClinux__)
122 #error "Do not even bother, ash will not run on uClinux"
126 #define _DIAGASSERT(assert_expr) assert(assert_expr)
128 #define _DIAGASSERT(assert_expr)
132 #ifdef CONFIG_ASH_ALIAS
133 /* $NetBSD: alias.h,v 1.5 2002/11/24 22:35:38 christos Exp $ */
145 static struct alias *lookupalias(const char *, int);
146 static int aliascmd(int, char **);
147 static int unaliascmd(int, char **);
148 static void rmaliases(void);
149 static int unalias(const char *);
150 static void printalias(const struct alias *);
153 /* $NetBSD: cd.h,v 1.3 2002/11/24 22:35:39 christos Exp $ */
156 static void setpwd(const char *, int);
158 /* $NetBSD: error.h,v 1.15 2002/11/24 22:35:39 christos Exp $ */
162 * Types of operations (passed to the errmsg routine).
166 static const char not_found_msg[] = "%s: not found";
169 #define E_OPEN "No such file" /* opening a file */
170 #define E_CREAT "Directory nonexistent" /* creating a file */
171 #define E_EXEC not_found_msg+4 /* executing a program */
174 * We enclose jmp_buf in a structure so that we can declare pointers to
175 * jump locations. The global variable handler contains the location to
176 * jump to when an exception occurs, and the global variable exception
177 * contains a code identifying the exception. To implement nested
178 * exception handlers, the user should save the value of handler on entry
179 * to an inner scope, set handler to point to a jmploc structure for the
180 * inner scope, and restore handler on exit from the scope.
187 static struct jmploc *handler;
188 static int exception;
189 static volatile int suppressint;
190 static volatile sig_atomic_t intpending;
192 static int exerrno; /* Last exec error, error for EXEXEC */
195 #define EXINT 0 /* SIGINT received */
196 #define EXERROR 1 /* a generic error */
197 #define EXSHELLPROC 2 /* execute a shell procedure */
198 #define EXEXEC 3 /* command execution failed */
199 #define EXEXIT 4 /* exit the shell */
200 #define EXSIG 5 /* trapped signal in wait(1) */
203 /* do we generate EXSIG events */
205 /* last pending signal */
206 static volatile sig_atomic_t pendingsigs;
209 * These macros allow the user to suspend the handling of interrupt signals
210 * over a period of time. This is similar to SIGHOLD to or sigblock, but
211 * much more efficient and portable. (But hacking the kernel is so much
212 * more fun than worrying about efficiency and portability. :-))
215 #define xbarrier() ({ __asm__ __volatile__ ("": : :"memory"); })
222 #define SAVEINT(v) ((v) = suppressint)
223 #define RESTOREINT(v) \
226 if ((suppressint = (v)) == 0 && intpending) onint(); \
237 /* EXSIG is turned off by evalbltin(). */
240 static void exraise(int) __attribute__((__noreturn__));
241 static void onint(void) __attribute__((__noreturn__));
243 static void error(const char *, ...) __attribute__((__noreturn__));
244 static void exerror(int, const char *, ...) __attribute__((__noreturn__));
246 static void sh_warnx(const char *, ...);
248 #ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
251 if (--suppressint == 0 && intpending) {
255 #define INTON inton()
256 static void forceinton(void)
262 #define FORCEINTON forceinton()
267 if (--suppressint == 0 && intpending) onint(); \
274 if (intpending) onint(); \
277 #endif /* CONFIG_ASH_OPTIMIZE_FOR_SIZE */
279 /* $NetBSD: expand.h,v 1.13 2002/11/24 22:35:40 christos Exp $ */
282 struct strlist *next;
288 struct strlist *list;
289 struct strlist **lastp;
295 #define EXP_FULL 0x1 /* perform word splitting & file globbing */
296 #define EXP_TILDE 0x2 /* do normal tilde expansion */
297 #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */
298 #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */
299 #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */
300 #define EXP_RECORD 0x20 /* need to record arguments for ifs breakup */
301 #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */
302 #define EXP_WORD 0x80 /* expand word in parameter expansion */
303 #define EXP_QWORD 0x100 /* expand word in quoted parameter expansion */
307 static void expandarg(union node *, struct arglist *, int);
308 #define rmescapes(p) _rmescapes((p), 0)
309 static char *_rmescapes(char *, int);
310 static int casematch(union node *, char *);
312 #ifdef CONFIG_ASH_MATH_SUPPORT
313 static void expari(int);
316 /* $NetBSD: eval.h,v 1.13 2002/11/24 22:35:39 christos Exp $ */
318 static char *commandname; /* currently executing command */
319 static struct strlist *cmdenviron; /* environment for builtin command */
320 static int exitstatus; /* exit status of last command */
321 static int back_exitstatus; /* exit status of backquoted command */
324 struct backcmd { /* result of evalbackcmd */
325 int fd; /* file descriptor to read from */
326 char *buf; /* buffer */
327 int nleft; /* number of chars in buffer */
328 struct job *jp; /* job structure for command */
332 * This file was generated by the mknodes program.
368 union node *redirect;
375 struct nodelist *cmdlist;
382 union node *redirect;
397 union node *elsepart;
428 struct nodelist *backquote;
468 struct nredir nredir;
469 struct nbinary nbinary;
473 struct nclist nclist;
483 struct nodelist *next;
494 static void freefunc(struct funcnode *);
495 /* $NetBSD: parser.h,v 1.15 2002/11/24 22:35:42 christos Exp $ */
497 /* control characters in argument strings */
498 #define CTL_FIRST '\201' /* first 'special' character */
499 #define CTLESC '\201' /* escape next character */
500 #define CTLVAR '\202' /* variable defn */
501 #define CTLENDVAR '\203'
502 #define CTLBACKQ '\204'
503 #define CTLQUOTE 01 /* ored with CTLBACKQ code if in quotes */
504 /* CTLBACKQ | CTLQUOTE == '\205' */
505 #define CTLARI '\206' /* arithmetic expression */
506 #define CTLENDARI '\207'
507 #define CTLQUOTEMARK '\210'
508 #define CTL_LAST '\210' /* last 'special' character */
510 /* variable substitution byte (follows CTLVAR) */
511 #define VSTYPE 0x0f /* type of variable substitution */
512 #define VSNUL 0x10 /* colon--treat the empty string as unset */
513 #define VSQUOTE 0x80 /* inside double quotes--suppress splitting */
515 /* values of VSTYPE field */
516 #define VSNORMAL 0x1 /* normal variable: $var or ${var} */
517 #define VSMINUS 0x2 /* ${var-text} */
518 #define VSPLUS 0x3 /* ${var+text} */
519 #define VSQUESTION 0x4 /* ${var?message} */
520 #define VSASSIGN 0x5 /* ${var=text} */
521 #define VSTRIMRIGHT 0x6 /* ${var%pattern} */
522 #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */
523 #define VSTRIMLEFT 0x8 /* ${var#pattern} */
524 #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */
525 #define VSLENGTH 0xa /* ${#var} */
527 /* values of checkkwd variable */
532 #define IBUFSIZ (BUFSIZ + 1)
535 * NEOF is returned by parsecmd when it encounters an end of file. It
536 * must be distinct from NULL, so we use the address of a variable that
537 * happens to be handy.
539 static int plinno = 1; /* input line number */
541 /* number of characters left in input buffer */
542 static int parsenleft; /* copy of parsefile->nleft */
543 static int parselleft; /* copy of parsefile->lleft */
545 /* next character in input buffer */
546 static char *parsenextc; /* copy of parsefile->nextc */
549 struct strpush *prev; /* preceding string on stack */
552 #ifdef CONFIG_ASH_ALIAS
553 struct alias *ap; /* if push was associated with an alias */
555 char *string; /* remember the string since it may change */
559 struct parsefile *prev; /* preceding file on stack */
560 int linno; /* current line */
561 int fd; /* file descriptor (or -1 if string) */
562 int nleft; /* number of chars left in this line */
563 int lleft; /* number of chars left in this buffer */
564 char *nextc; /* next char in buffer */
565 char *buf; /* input buffer */
566 struct strpush *strpush; /* for pushing strings at this level */
567 struct strpush basestrpush; /* so pushing one is fast */
570 static struct parsefile basepf; /* top level input file */
571 static char basebuf[IBUFSIZ]; /* buffer for top level input file */
572 static struct parsefile *parsefile = &basepf; /* current input file */
575 static int tokpushback; /* last token pushed back */
576 #define NEOF ((union node *)&tokpushback)
577 static int parsebackquote; /* nonzero if we are inside backquotes */
578 static int doprompt; /* if set, prompt the user */
579 static int needprompt; /* true if interactive and at start of line */
580 static int lasttoken; /* last token read */
581 static char *wordtext; /* text of last word returned by readtoken */
583 static struct nodelist *backquotelist;
584 static union node *redirnode;
585 static struct heredoc *heredoc;
586 static int quoteflag; /* set if (part of) last token was quoted */
587 static int startlinno; /* line # where last token started */
589 static union node *parsecmd(int);
590 static void fixredir(union node *, const char *, int);
591 static const char *const *findkwd(const char *);
592 static char *endofname(const char *);
594 /* $NetBSD: shell.h,v 1.16 2003/01/22 20:36:04 dsl Exp $ */
596 typedef void *pointer;
598 static char nullstr[1]; /* zero length string */
599 static const char spcstr[] = " ";
600 static const char snlfmt[] = "%s\n";
601 static const char dolatstr[] = { CTLVAR, VSNORMAL|VSQUOTE, '@', '=', '\0' };
602 static const char illnum[] = "Illegal number: %s";
603 static const char homestr[] = "HOME";
606 #define TRACE(param) trace param
607 #define TRACEV(param) tracev param
610 #define TRACEV(param)
613 #if !defined(__GNUC__) || (__GNUC__ == 2 && __GNUC_MINOR__ < 96)
614 #define __builtin_expect(x, expected_value) (x)
617 #define xlikely(x) __builtin_expect((x),1)
632 #define TENDBQUOTE 12
650 /* first char is indicating which tokens mark the end of a list */
651 static const char *const tokname_array[] = {
666 /* the following are keywords */
685 static const char *tokname(int tok)
691 sprintf(buf + (tok >= TSEMI), "%s%c",
692 tokname_array[tok] + 1, (tok >= TSEMI ? '"' : 0));
696 /* $NetBSD: machdep.h,v 1.10 2002/10/07 14:26:08 christos Exp $ */
699 * Most machines require the value returned from malloc to be aligned
700 * in some way. The following macro will get this right on many machines.
703 #define SHELL_SIZE (sizeof(union {int i; char *cp; double d; }) - 1)
705 * It appears that grabstackstr() will barf with such alignments
706 * because stalloc() will return a string allocated in a new stackblock.
708 #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE)
711 * This file was generated by the mksyntax program.
716 #define CWORD 0 /* character is nothing special */
717 #define CNL 1 /* newline character */
718 #define CBACK 2 /* a backslash character */
719 #define CSQUOTE 3 /* single quote */
720 #define CDQUOTE 4 /* double quote */
721 #define CENDQUOTE 5 /* a terminating quote */
722 #define CBQUOTE 6 /* backwards single quote */
723 #define CVAR 7 /* a dollar sign */
724 #define CENDVAR 8 /* a '}' character */
725 #define CLP 9 /* a left paren in arithmetic */
726 #define CRP 10 /* a right paren in arithmetic */
727 #define CENDFILE 11 /* end of file */
728 #define CCTL 12 /* like CWORD, except it must be escaped */
729 #define CSPCL 13 /* these terminate a word */
730 #define CIGN 14 /* character should be ignored */
732 #ifdef CONFIG_ASH_ALIAS
736 #define PEOA_OR_PEOF PEOA
740 #define PEOA_OR_PEOF PEOF
743 #define is_digit(c) ((unsigned)((c) - '0') <= 9)
744 #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
745 #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
748 * is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise
749 * (assuming ascii char codes, as the original implementation did)
751 #define is_special(c) \
752 ( (((unsigned int)c) - 33 < 32) \
753 && ((0xc1ff920dUL >> (((unsigned int)c) - 33)) & 1))
755 #define digit_val(c) ((c) - '0')
758 * This file was generated by the mksyntax program.
761 #ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
762 #define USE_SIT_FUNCTION
765 /* number syntax index */
766 #define BASESYNTAX 0 /* not in quotes */
767 #define DQSYNTAX 1 /* in double quotes */
768 #define SQSYNTAX 2 /* in single quotes */
769 #define ARISYNTAX 3 /* in arithmetic */
771 #ifdef CONFIG_ASH_MATH_SUPPORT
772 static const char S_I_T[][4] = {
773 #ifdef CONFIG_ASH_ALIAS
774 {CSPCL, CIGN, CIGN, CIGN}, /* 0, PEOA */
776 {CSPCL, CWORD, CWORD, CWORD}, /* 1, ' ' */
777 {CNL, CNL, CNL, CNL}, /* 2, \n */
778 {CWORD, CCTL, CCTL, CWORD}, /* 3, !*-/:=?[]~ */
779 {CDQUOTE, CENDQUOTE, CWORD, CWORD}, /* 4, '"' */
780 {CVAR, CVAR, CWORD, CVAR}, /* 5, $ */
781 {CSQUOTE, CWORD, CENDQUOTE, CWORD}, /* 6, "'" */
782 {CSPCL, CWORD, CWORD, CLP}, /* 7, ( */
783 {CSPCL, CWORD, CWORD, CRP}, /* 8, ) */
784 {CBACK, CBACK, CCTL, CBACK}, /* 9, \ */
785 {CBQUOTE, CBQUOTE, CWORD, CBQUOTE}, /* 10, ` */
786 {CENDVAR, CENDVAR, CWORD, CENDVAR}, /* 11, } */
787 #ifndef USE_SIT_FUNCTION
788 {CENDFILE, CENDFILE, CENDFILE, CENDFILE}, /* 12, PEOF */
789 {CWORD, CWORD, CWORD, CWORD}, /* 13, 0-9A-Za-z */
790 {CCTL, CCTL, CCTL, CCTL} /* 14, CTLESC ... */
794 static const char S_I_T[][3] = {
795 #ifdef CONFIG_ASH_ALIAS
796 {CSPCL, CIGN, CIGN}, /* 0, PEOA */
798 {CSPCL, CWORD, CWORD}, /* 1, ' ' */
799 {CNL, CNL, CNL}, /* 2, \n */
800 {CWORD, CCTL, CCTL}, /* 3, !*-/:=?[]~ */
801 {CDQUOTE, CENDQUOTE, CWORD}, /* 4, '"' */
802 {CVAR, CVAR, CWORD}, /* 5, $ */
803 {CSQUOTE, CWORD, CENDQUOTE}, /* 6, "'" */
804 {CSPCL, CWORD, CWORD}, /* 7, ( */
805 {CSPCL, CWORD, CWORD}, /* 8, ) */
806 {CBACK, CBACK, CCTL}, /* 9, \ */
807 {CBQUOTE, CBQUOTE, CWORD}, /* 10, ` */
808 {CENDVAR, CENDVAR, CWORD}, /* 11, } */
809 #ifndef USE_SIT_FUNCTION
810 {CENDFILE, CENDFILE, CENDFILE}, /* 12, PEOF */
811 {CWORD, CWORD, CWORD}, /* 13, 0-9A-Za-z */
812 {CCTL, CCTL, CCTL} /* 14, CTLESC ... */
815 #endif /* CONFIG_ASH_MATH_SUPPORT */
817 #ifdef USE_SIT_FUNCTION
819 #define U_C(c) ((unsigned char)(c))
821 static int SIT(int c, int syntax)
823 static const char spec_symbls[] = "\t\n !\"$&'()*-/:;<=>?[\\]`|}~";
824 #ifdef CONFIG_ASH_ALIAS
825 static const char syntax_index_table[] = {
826 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */
827 7, 8, 3, 3, 3, 3, 1, 1, /* "()*-/:;<" */
828 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */
832 static const char syntax_index_table[] = {
833 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */
834 6, 7, 2, 2, 2, 2, 0, 0, /* "()*-/:;<" */
835 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */
842 if (c == PEOF) /* 2^8+2 */
844 #ifdef CONFIG_ASH_ALIAS
845 if (c == PEOA) /* 2^8+1 */
849 if (U_C(c) >= U_C(CTLESC) && U_C(c) <= U_C(CTLQUOTEMARK))
852 s = strchr(spec_symbls, c);
853 if (s == 0 || *s == 0)
855 indx = syntax_index_table[(s - spec_symbls)];
857 return S_I_T[indx][syntax];
860 #else /* USE_SIT_FUNCTION */
862 #define SIT(c, syntax) S_I_T[(int)syntax_index_table[((int)c)+SYNBASE]][syntax]
864 #ifdef CONFIG_ASH_ALIAS
865 #define CSPCL_CIGN_CIGN_CIGN 0
866 #define CSPCL_CWORD_CWORD_CWORD 1
867 #define CNL_CNL_CNL_CNL 2
868 #define CWORD_CCTL_CCTL_CWORD 3
869 #define CDQUOTE_CENDQUOTE_CWORD_CWORD 4
870 #define CVAR_CVAR_CWORD_CVAR 5
871 #define CSQUOTE_CWORD_CENDQUOTE_CWORD 6
872 #define CSPCL_CWORD_CWORD_CLP 7
873 #define CSPCL_CWORD_CWORD_CRP 8
874 #define CBACK_CBACK_CCTL_CBACK 9
875 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 10
876 #define CENDVAR_CENDVAR_CWORD_CENDVAR 11
877 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 12
878 #define CWORD_CWORD_CWORD_CWORD 13
879 #define CCTL_CCTL_CCTL_CCTL 14
881 #define CSPCL_CWORD_CWORD_CWORD 0
882 #define CNL_CNL_CNL_CNL 1
883 #define CWORD_CCTL_CCTL_CWORD 2
884 #define CDQUOTE_CENDQUOTE_CWORD_CWORD 3
885 #define CVAR_CVAR_CWORD_CVAR 4
886 #define CSQUOTE_CWORD_CENDQUOTE_CWORD 5
887 #define CSPCL_CWORD_CWORD_CLP 6
888 #define CSPCL_CWORD_CWORD_CRP 7
889 #define CBACK_CBACK_CCTL_CBACK 8
890 #define CBQUOTE_CBQUOTE_CWORD_CBQUOTE 9
891 #define CENDVAR_CENDVAR_CWORD_CENDVAR 10
892 #define CENDFILE_CENDFILE_CENDFILE_CENDFILE 11
893 #define CWORD_CWORD_CWORD_CWORD 12
894 #define CCTL_CCTL_CCTL_CCTL 13
897 static const char syntax_index_table[258] = {
898 /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */
899 /* 0 PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE,
900 #ifdef CONFIG_ASH_ALIAS
901 /* 1 PEOA */ CSPCL_CIGN_CIGN_CIGN,
903 /* 2 -128 0x80 */ CWORD_CWORD_CWORD_CWORD,
904 /* 3 -127 CTLESC */ CCTL_CCTL_CCTL_CCTL,
905 /* 4 -126 CTLVAR */ CCTL_CCTL_CCTL_CCTL,
906 /* 5 -125 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL,
907 /* 6 -124 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL,
908 /* 7 -123 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL,
909 /* 8 -122 CTLARI */ CCTL_CCTL_CCTL_CCTL,
910 /* 9 -121 CTLENDARI */ CCTL_CCTL_CCTL_CCTL,
911 /* 10 -120 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL,
912 /* 11 -119 */ CWORD_CWORD_CWORD_CWORD,
913 /* 12 -118 */ CWORD_CWORD_CWORD_CWORD,
914 /* 13 -117 */ CWORD_CWORD_CWORD_CWORD,
915 /* 14 -116 */ CWORD_CWORD_CWORD_CWORD,
916 /* 15 -115 */ CWORD_CWORD_CWORD_CWORD,
917 /* 16 -114 */ CWORD_CWORD_CWORD_CWORD,
918 /* 17 -113 */ CWORD_CWORD_CWORD_CWORD,
919 /* 18 -112 */ CWORD_CWORD_CWORD_CWORD,
920 /* 19 -111 */ CWORD_CWORD_CWORD_CWORD,
921 /* 20 -110 */ CWORD_CWORD_CWORD_CWORD,
922 /* 21 -109 */ CWORD_CWORD_CWORD_CWORD,
923 /* 22 -108 */ CWORD_CWORD_CWORD_CWORD,
924 /* 23 -107 */ CWORD_CWORD_CWORD_CWORD,
925 /* 24 -106 */ CWORD_CWORD_CWORD_CWORD,
926 /* 25 -105 */ CWORD_CWORD_CWORD_CWORD,
927 /* 26 -104 */ CWORD_CWORD_CWORD_CWORD,
928 /* 27 -103 */ CWORD_CWORD_CWORD_CWORD,
929 /* 28 -102 */ CWORD_CWORD_CWORD_CWORD,
930 /* 29 -101 */ CWORD_CWORD_CWORD_CWORD,
931 /* 30 -100 */ CWORD_CWORD_CWORD_CWORD,
932 /* 31 -99 */ CWORD_CWORD_CWORD_CWORD,
933 /* 32 -98 */ CWORD_CWORD_CWORD_CWORD,
934 /* 33 -97 */ CWORD_CWORD_CWORD_CWORD,
935 /* 34 -96 */ CWORD_CWORD_CWORD_CWORD,
936 /* 35 -95 */ CWORD_CWORD_CWORD_CWORD,
937 /* 36 -94 */ CWORD_CWORD_CWORD_CWORD,
938 /* 37 -93 */ CWORD_CWORD_CWORD_CWORD,
939 /* 38 -92 */ CWORD_CWORD_CWORD_CWORD,
940 /* 39 -91 */ CWORD_CWORD_CWORD_CWORD,
941 /* 40 -90 */ CWORD_CWORD_CWORD_CWORD,
942 /* 41 -89 */ CWORD_CWORD_CWORD_CWORD,
943 /* 42 -88 */ CWORD_CWORD_CWORD_CWORD,
944 /* 43 -87 */ CWORD_CWORD_CWORD_CWORD,
945 /* 44 -86 */ CWORD_CWORD_CWORD_CWORD,
946 /* 45 -85 */ CWORD_CWORD_CWORD_CWORD,
947 /* 46 -84 */ CWORD_CWORD_CWORD_CWORD,
948 /* 47 -83 */ CWORD_CWORD_CWORD_CWORD,
949 /* 48 -82 */ CWORD_CWORD_CWORD_CWORD,
950 /* 49 -81 */ CWORD_CWORD_CWORD_CWORD,
951 /* 50 -80 */ CWORD_CWORD_CWORD_CWORD,
952 /* 51 -79 */ CWORD_CWORD_CWORD_CWORD,
953 /* 52 -78 */ CWORD_CWORD_CWORD_CWORD,
954 /* 53 -77 */ CWORD_CWORD_CWORD_CWORD,
955 /* 54 -76 */ CWORD_CWORD_CWORD_CWORD,
956 /* 55 -75 */ CWORD_CWORD_CWORD_CWORD,
957 /* 56 -74 */ CWORD_CWORD_CWORD_CWORD,
958 /* 57 -73 */ CWORD_CWORD_CWORD_CWORD,
959 /* 58 -72 */ CWORD_CWORD_CWORD_CWORD,
960 /* 59 -71 */ CWORD_CWORD_CWORD_CWORD,
961 /* 60 -70 */ CWORD_CWORD_CWORD_CWORD,
962 /* 61 -69 */ CWORD_CWORD_CWORD_CWORD,
963 /* 62 -68 */ CWORD_CWORD_CWORD_CWORD,
964 /* 63 -67 */ CWORD_CWORD_CWORD_CWORD,
965 /* 64 -66 */ CWORD_CWORD_CWORD_CWORD,
966 /* 65 -65 */ CWORD_CWORD_CWORD_CWORD,
967 /* 66 -64 */ CWORD_CWORD_CWORD_CWORD,
968 /* 67 -63 */ CWORD_CWORD_CWORD_CWORD,
969 /* 68 -62 */ CWORD_CWORD_CWORD_CWORD,
970 /* 69 -61 */ CWORD_CWORD_CWORD_CWORD,
971 /* 70 -60 */ CWORD_CWORD_CWORD_CWORD,
972 /* 71 -59 */ CWORD_CWORD_CWORD_CWORD,
973 /* 72 -58 */ CWORD_CWORD_CWORD_CWORD,
974 /* 73 -57 */ CWORD_CWORD_CWORD_CWORD,
975 /* 74 -56 */ CWORD_CWORD_CWORD_CWORD,
976 /* 75 -55 */ CWORD_CWORD_CWORD_CWORD,
977 /* 76 -54 */ CWORD_CWORD_CWORD_CWORD,
978 /* 77 -53 */ CWORD_CWORD_CWORD_CWORD,
979 /* 78 -52 */ CWORD_CWORD_CWORD_CWORD,
980 /* 79 -51 */ CWORD_CWORD_CWORD_CWORD,
981 /* 80 -50 */ CWORD_CWORD_CWORD_CWORD,
982 /* 81 -49 */ CWORD_CWORD_CWORD_CWORD,
983 /* 82 -48 */ CWORD_CWORD_CWORD_CWORD,
984 /* 83 -47 */ CWORD_CWORD_CWORD_CWORD,
985 /* 84 -46 */ CWORD_CWORD_CWORD_CWORD,
986 /* 85 -45 */ CWORD_CWORD_CWORD_CWORD,
987 /* 86 -44 */ CWORD_CWORD_CWORD_CWORD,
988 /* 87 -43 */ CWORD_CWORD_CWORD_CWORD,
989 /* 88 -42 */ CWORD_CWORD_CWORD_CWORD,
990 /* 89 -41 */ CWORD_CWORD_CWORD_CWORD,
991 /* 90 -40 */ CWORD_CWORD_CWORD_CWORD,
992 /* 91 -39 */ CWORD_CWORD_CWORD_CWORD,
993 /* 92 -38 */ CWORD_CWORD_CWORD_CWORD,
994 /* 93 -37 */ CWORD_CWORD_CWORD_CWORD,
995 /* 94 -36 */ CWORD_CWORD_CWORD_CWORD,
996 /* 95 -35 */ CWORD_CWORD_CWORD_CWORD,
997 /* 96 -34 */ CWORD_CWORD_CWORD_CWORD,
998 /* 97 -33 */ CWORD_CWORD_CWORD_CWORD,
999 /* 98 -32 */ CWORD_CWORD_CWORD_CWORD,
1000 /* 99 -31 */ CWORD_CWORD_CWORD_CWORD,
1001 /* 100 -30 */ CWORD_CWORD_CWORD_CWORD,
1002 /* 101 -29 */ CWORD_CWORD_CWORD_CWORD,
1003 /* 102 -28 */ CWORD_CWORD_CWORD_CWORD,
1004 /* 103 -27 */ CWORD_CWORD_CWORD_CWORD,
1005 /* 104 -26 */ CWORD_CWORD_CWORD_CWORD,
1006 /* 105 -25 */ CWORD_CWORD_CWORD_CWORD,
1007 /* 106 -24 */ CWORD_CWORD_CWORD_CWORD,
1008 /* 107 -23 */ CWORD_CWORD_CWORD_CWORD,
1009 /* 108 -22 */ CWORD_CWORD_CWORD_CWORD,
1010 /* 109 -21 */ CWORD_CWORD_CWORD_CWORD,
1011 /* 110 -20 */ CWORD_CWORD_CWORD_CWORD,
1012 /* 111 -19 */ CWORD_CWORD_CWORD_CWORD,
1013 /* 112 -18 */ CWORD_CWORD_CWORD_CWORD,
1014 /* 113 -17 */ CWORD_CWORD_CWORD_CWORD,
1015 /* 114 -16 */ CWORD_CWORD_CWORD_CWORD,
1016 /* 115 -15 */ CWORD_CWORD_CWORD_CWORD,
1017 /* 116 -14 */ CWORD_CWORD_CWORD_CWORD,
1018 /* 117 -13 */ CWORD_CWORD_CWORD_CWORD,
1019 /* 118 -12 */ CWORD_CWORD_CWORD_CWORD,
1020 /* 119 -11 */ CWORD_CWORD_CWORD_CWORD,
1021 /* 120 -10 */ CWORD_CWORD_CWORD_CWORD,
1022 /* 121 -9 */ CWORD_CWORD_CWORD_CWORD,
1023 /* 122 -8 */ CWORD_CWORD_CWORD_CWORD,
1024 /* 123 -7 */ CWORD_CWORD_CWORD_CWORD,
1025 /* 124 -6 */ CWORD_CWORD_CWORD_CWORD,
1026 /* 125 -5 */ CWORD_CWORD_CWORD_CWORD,
1027 /* 126 -4 */ CWORD_CWORD_CWORD_CWORD,
1028 /* 127 -3 */ CWORD_CWORD_CWORD_CWORD,
1029 /* 128 -2 */ CWORD_CWORD_CWORD_CWORD,
1030 /* 129 -1 */ CWORD_CWORD_CWORD_CWORD,
1031 /* 130 0 */ CWORD_CWORD_CWORD_CWORD,
1032 /* 131 1 */ CWORD_CWORD_CWORD_CWORD,
1033 /* 132 2 */ CWORD_CWORD_CWORD_CWORD,
1034 /* 133 3 */ CWORD_CWORD_CWORD_CWORD,
1035 /* 134 4 */ CWORD_CWORD_CWORD_CWORD,
1036 /* 135 5 */ CWORD_CWORD_CWORD_CWORD,
1037 /* 136 6 */ CWORD_CWORD_CWORD_CWORD,
1038 /* 137 7 */ CWORD_CWORD_CWORD_CWORD,
1039 /* 138 8 */ CWORD_CWORD_CWORD_CWORD,
1040 /* 139 9 "\t" */ CSPCL_CWORD_CWORD_CWORD,
1041 /* 140 10 "\n" */ CNL_CNL_CNL_CNL,
1042 /* 141 11 */ CWORD_CWORD_CWORD_CWORD,
1043 /* 142 12 */ CWORD_CWORD_CWORD_CWORD,
1044 /* 143 13 */ CWORD_CWORD_CWORD_CWORD,
1045 /* 144 14 */ CWORD_CWORD_CWORD_CWORD,
1046 /* 145 15 */ CWORD_CWORD_CWORD_CWORD,
1047 /* 146 16 */ CWORD_CWORD_CWORD_CWORD,
1048 /* 147 17 */ CWORD_CWORD_CWORD_CWORD,
1049 /* 148 18 */ CWORD_CWORD_CWORD_CWORD,
1050 /* 149 19 */ CWORD_CWORD_CWORD_CWORD,
1051 /* 150 20 */ CWORD_CWORD_CWORD_CWORD,
1052 /* 151 21 */ CWORD_CWORD_CWORD_CWORD,
1053 /* 152 22 */ CWORD_CWORD_CWORD_CWORD,
1054 /* 153 23 */ CWORD_CWORD_CWORD_CWORD,
1055 /* 154 24 */ CWORD_CWORD_CWORD_CWORD,
1056 /* 155 25 */ CWORD_CWORD_CWORD_CWORD,
1057 /* 156 26 */ CWORD_CWORD_CWORD_CWORD,
1058 /* 157 27 */ CWORD_CWORD_CWORD_CWORD,
1059 /* 158 28 */ CWORD_CWORD_CWORD_CWORD,
1060 /* 159 29 */ CWORD_CWORD_CWORD_CWORD,
1061 /* 160 30 */ CWORD_CWORD_CWORD_CWORD,
1062 /* 161 31 */ CWORD_CWORD_CWORD_CWORD,
1063 /* 162 32 " " */ CSPCL_CWORD_CWORD_CWORD,
1064 /* 163 33 "!" */ CWORD_CCTL_CCTL_CWORD,
1065 /* 164 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD,
1066 /* 165 35 "#" */ CWORD_CWORD_CWORD_CWORD,
1067 /* 166 36 "$" */ CVAR_CVAR_CWORD_CVAR,
1068 /* 167 37 "%" */ CWORD_CWORD_CWORD_CWORD,
1069 /* 168 38 "&" */ CSPCL_CWORD_CWORD_CWORD,
1070 /* 169 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD,
1071 /* 170 40 "(" */ CSPCL_CWORD_CWORD_CLP,
1072 /* 171 41 ")" */ CSPCL_CWORD_CWORD_CRP,
1073 /* 172 42 "*" */ CWORD_CCTL_CCTL_CWORD,
1074 /* 173 43 "+" */ CWORD_CWORD_CWORD_CWORD,
1075 /* 174 44 "," */ CWORD_CWORD_CWORD_CWORD,
1076 /* 175 45 "-" */ CWORD_CCTL_CCTL_CWORD,
1077 /* 176 46 "." */ CWORD_CWORD_CWORD_CWORD,
1078 /* 177 47 "/" */ CWORD_CCTL_CCTL_CWORD,
1079 /* 178 48 "0" */ CWORD_CWORD_CWORD_CWORD,
1080 /* 179 49 "1" */ CWORD_CWORD_CWORD_CWORD,
1081 /* 180 50 "2" */ CWORD_CWORD_CWORD_CWORD,
1082 /* 181 51 "3" */ CWORD_CWORD_CWORD_CWORD,
1083 /* 182 52 "4" */ CWORD_CWORD_CWORD_CWORD,
1084 /* 183 53 "5" */ CWORD_CWORD_CWORD_CWORD,
1085 /* 184 54 "6" */ CWORD_CWORD_CWORD_CWORD,
1086 /* 185 55 "7" */ CWORD_CWORD_CWORD_CWORD,
1087 /* 186 56 "8" */ CWORD_CWORD_CWORD_CWORD,
1088 /* 187 57 "9" */ CWORD_CWORD_CWORD_CWORD,
1089 /* 188 58 ":" */ CWORD_CCTL_CCTL_CWORD,
1090 /* 189 59 ";" */ CSPCL_CWORD_CWORD_CWORD,
1091 /* 190 60 "<" */ CSPCL_CWORD_CWORD_CWORD,
1092 /* 191 61 "=" */ CWORD_CCTL_CCTL_CWORD,
1093 /* 192 62 ">" */ CSPCL_CWORD_CWORD_CWORD,
1094 /* 193 63 "?" */ CWORD_CCTL_CCTL_CWORD,
1095 /* 194 64 "@" */ CWORD_CWORD_CWORD_CWORD,
1096 /* 195 65 "A" */ CWORD_CWORD_CWORD_CWORD,
1097 /* 196 66 "B" */ CWORD_CWORD_CWORD_CWORD,
1098 /* 197 67 "C" */ CWORD_CWORD_CWORD_CWORD,
1099 /* 198 68 "D" */ CWORD_CWORD_CWORD_CWORD,
1100 /* 199 69 "E" */ CWORD_CWORD_CWORD_CWORD,
1101 /* 200 70 "F" */ CWORD_CWORD_CWORD_CWORD,
1102 /* 201 71 "G" */ CWORD_CWORD_CWORD_CWORD,
1103 /* 202 72 "H" */ CWORD_CWORD_CWORD_CWORD,
1104 /* 203 73 "I" */ CWORD_CWORD_CWORD_CWORD,
1105 /* 204 74 "J" */ CWORD_CWORD_CWORD_CWORD,
1106 /* 205 75 "K" */ CWORD_CWORD_CWORD_CWORD,
1107 /* 206 76 "L" */ CWORD_CWORD_CWORD_CWORD,
1108 /* 207 77 "M" */ CWORD_CWORD_CWORD_CWORD,
1109 /* 208 78 "N" */ CWORD_CWORD_CWORD_CWORD,
1110 /* 209 79 "O" */ CWORD_CWORD_CWORD_CWORD,
1111 /* 210 80 "P" */ CWORD_CWORD_CWORD_CWORD,
1112 /* 211 81 "Q" */ CWORD_CWORD_CWORD_CWORD,
1113 /* 212 82 "R" */ CWORD_CWORD_CWORD_CWORD,
1114 /* 213 83 "S" */ CWORD_CWORD_CWORD_CWORD,
1115 /* 214 84 "T" */ CWORD_CWORD_CWORD_CWORD,
1116 /* 215 85 "U" */ CWORD_CWORD_CWORD_CWORD,
1117 /* 216 86 "V" */ CWORD_CWORD_CWORD_CWORD,
1118 /* 217 87 "W" */ CWORD_CWORD_CWORD_CWORD,
1119 /* 218 88 "X" */ CWORD_CWORD_CWORD_CWORD,
1120 /* 219 89 "Y" */ CWORD_CWORD_CWORD_CWORD,
1121 /* 220 90 "Z" */ CWORD_CWORD_CWORD_CWORD,
1122 /* 221 91 "[" */ CWORD_CCTL_CCTL_CWORD,
1123 /* 222 92 "\" */ CBACK_CBACK_CCTL_CBACK,
1124 /* 223 93 "]" */ CWORD_CCTL_CCTL_CWORD,
1125 /* 224 94 "^" */ CWORD_CWORD_CWORD_CWORD,
1126 /* 225 95 "_" */ CWORD_CWORD_CWORD_CWORD,
1127 /* 226 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE,
1128 /* 227 97 "a" */ CWORD_CWORD_CWORD_CWORD,
1129 /* 228 98 "b" */ CWORD_CWORD_CWORD_CWORD,
1130 /* 229 99 "c" */ CWORD_CWORD_CWORD_CWORD,
1131 /* 230 100 "d" */ CWORD_CWORD_CWORD_CWORD,
1132 /* 231 101 "e" */ CWORD_CWORD_CWORD_CWORD,
1133 /* 232 102 "f" */ CWORD_CWORD_CWORD_CWORD,
1134 /* 233 103 "g" */ CWORD_CWORD_CWORD_CWORD,
1135 /* 234 104 "h" */ CWORD_CWORD_CWORD_CWORD,
1136 /* 235 105 "i" */ CWORD_CWORD_CWORD_CWORD,
1137 /* 236 106 "j" */ CWORD_CWORD_CWORD_CWORD,
1138 /* 237 107 "k" */ CWORD_CWORD_CWORD_CWORD,
1139 /* 238 108 "l" */ CWORD_CWORD_CWORD_CWORD,
1140 /* 239 109 "m" */ CWORD_CWORD_CWORD_CWORD,
1141 /* 240 110 "n" */ CWORD_CWORD_CWORD_CWORD,
1142 /* 241 111 "o" */ CWORD_CWORD_CWORD_CWORD,
1143 /* 242 112 "p" */ CWORD_CWORD_CWORD_CWORD,
1144 /* 243 113 "q" */ CWORD_CWORD_CWORD_CWORD,
1145 /* 244 114 "r" */ CWORD_CWORD_CWORD_CWORD,
1146 /* 245 115 "s" */ CWORD_CWORD_CWORD_CWORD,
1147 /* 246 116 "t" */ CWORD_CWORD_CWORD_CWORD,
1148 /* 247 117 "u" */ CWORD_CWORD_CWORD_CWORD,
1149 /* 248 118 "v" */ CWORD_CWORD_CWORD_CWORD,
1150 /* 249 119 "w" */ CWORD_CWORD_CWORD_CWORD,
1151 /* 250 120 "x" */ CWORD_CWORD_CWORD_CWORD,
1152 /* 251 121 "y" */ CWORD_CWORD_CWORD_CWORD,
1153 /* 252 122 "z" */ CWORD_CWORD_CWORD_CWORD,
1154 /* 253 123 "{" */ CWORD_CWORD_CWORD_CWORD,
1155 /* 254 124 "|" */ CSPCL_CWORD_CWORD_CWORD,
1156 /* 255 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR,
1157 /* 256 126 "~" */ CWORD_CCTL_CCTL_CWORD,
1158 /* 257 127 */ CWORD_CWORD_CWORD_CWORD,
1161 #endif /* USE_SIT_FUNCTION */
1163 /* $NetBSD: alias.c,v 1.11 2002/11/24 22:35:38 christos Exp $ */
1168 static int funcblocksize; /* size of structures in function */
1169 static int funcstringsize; /* size of strings in node */
1170 static pointer funcblock; /* block to allocate function from */
1171 static char *funcstring; /* block to allocate strings from */
1173 static const short nodesize[26] = {
1174 SHELL_ALIGN(sizeof (struct ncmd)),
1175 SHELL_ALIGN(sizeof (struct npipe)),
1176 SHELL_ALIGN(sizeof (struct nredir)),
1177 SHELL_ALIGN(sizeof (struct nredir)),
1178 SHELL_ALIGN(sizeof (struct nredir)),
1179 SHELL_ALIGN(sizeof (struct nbinary)),
1180 SHELL_ALIGN(sizeof (struct nbinary)),
1181 SHELL_ALIGN(sizeof (struct nbinary)),
1182 SHELL_ALIGN(sizeof (struct nif)),
1183 SHELL_ALIGN(sizeof (struct nbinary)),
1184 SHELL_ALIGN(sizeof (struct nbinary)),
1185 SHELL_ALIGN(sizeof (struct nfor)),
1186 SHELL_ALIGN(sizeof (struct ncase)),
1187 SHELL_ALIGN(sizeof (struct nclist)),
1188 SHELL_ALIGN(sizeof (struct narg)),
1189 SHELL_ALIGN(sizeof (struct narg)),
1190 SHELL_ALIGN(sizeof (struct nfile)),
1191 SHELL_ALIGN(sizeof (struct nfile)),
1192 SHELL_ALIGN(sizeof (struct nfile)),
1193 SHELL_ALIGN(sizeof (struct nfile)),
1194 SHELL_ALIGN(sizeof (struct nfile)),
1195 SHELL_ALIGN(sizeof (struct ndup)),
1196 SHELL_ALIGN(sizeof (struct ndup)),
1197 SHELL_ALIGN(sizeof (struct nhere)),
1198 SHELL_ALIGN(sizeof (struct nhere)),
1199 SHELL_ALIGN(sizeof (struct nnot)),
1203 static void calcsize(union node *);
1204 static void sizenodelist(struct nodelist *);
1205 static union node *copynode(union node *);
1206 static struct nodelist *copynodelist(struct nodelist *);
1207 static char *nodesavestr(char *);
1211 static void evalstring(char *);
1212 union node; /* BLETCH for ansi C */
1213 static void evaltree(union node *, int);
1214 static void evalbackcmd(union node *, struct backcmd *);
1216 /* in_function returns nonzero if we are currently evaluating a function */
1217 #define in_function() funcnest
1218 static int evalskip; /* set if we are skipping commands */
1219 static int skipcount; /* number of levels to skip */
1220 static int funcnest; /* depth of function calls */
1222 /* reasons for skipping commands (see comment on breakcmd routine) */
1229 * This file was generated by the mkbuiltins program.
1233 static int bgcmd(int, char **);
1235 static int breakcmd(int, char **);
1236 static int cdcmd(int, char **);
1237 #ifdef CONFIG_ASH_CMDCMD
1238 static int commandcmd(int, char **);
1240 static int dotcmd(int, char **);
1241 static int evalcmd(int, char **);
1242 #ifdef CONFIG_ASH_BUILTIN_ECHO
1243 static int echocmd(int, char **);
1245 static int execcmd(int, char **);
1246 static int exitcmd(int, char **);
1247 static int exportcmd(int, char **);
1248 static int falsecmd(int, char **);
1250 static int fgcmd(int, char **);
1252 #ifdef CONFIG_ASH_GETOPTS
1253 static int getoptscmd(int, char **);
1255 static int hashcmd(int, char **);
1256 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
1257 static int helpcmd(int argc, char **argv);
1260 static int jobscmd(int, char **);
1262 #ifdef CONFIG_ASH_MATH_SUPPORT
1263 static int letcmd(int, char **);
1265 static int localcmd(int, char **);
1266 static int pwdcmd(int, char **);
1267 static int readcmd(int, char **);
1268 static int returncmd(int, char **);
1269 static int setcmd(int, char **);
1270 static int shiftcmd(int, char **);
1271 static int timescmd(int, char **);
1272 static int trapcmd(int, char **);
1273 static int truecmd(int, char **);
1274 static int typecmd(int, char **);
1275 static int umaskcmd(int, char **);
1276 static int unsetcmd(int, char **);
1277 static int waitcmd(int, char **);
1278 static int ulimitcmd(int, char **);
1280 static int killcmd(int, char **);
1283 /* $NetBSD: mail.h,v 1.9 2002/11/24 22:35:40 christos Exp $ */
1285 #ifdef CONFIG_ASH_MAIL
1286 static void chkmail(void);
1287 static void changemail(const char *);
1290 /* $NetBSD: exec.h,v 1.20 2003/01/22 20:36:04 dsl Exp $ */
1292 /* values of cmdtype */
1293 #define CMDUNKNOWN -1 /* no entry in table for command */
1294 #define CMDNORMAL 0 /* command is an executable program */
1295 #define CMDFUNCTION 1 /* command is a shell function */
1296 #define CMDBUILTIN 2 /* command is a shell builtin */
1300 int (*builtin)(int, char **);
1301 /* unsigned flags; */
1305 #define COMMANDCMD (builtincmd + 5 + \
1306 ENABLE_ASH_ALIAS + ENABLE_ASH_JOB_CONTROL)
1307 #define EXECCMD (builtincmd + 7 + \
1308 ENABLE_ASH_CMDCMD + ENABLE_ASH_ALIAS + \
1309 ENABLE_ASH_BUILTIN_ECHO + ENABLE_ASH_JOB_CONTROL)
1311 #define BUILTIN_NOSPEC "0"
1312 #define BUILTIN_SPECIAL "1"
1313 #define BUILTIN_REGULAR "2"
1314 #define BUILTIN_SPEC_REG "3"
1315 #define BUILTIN_ASSIGN "4"
1316 #define BUILTIN_SPEC_ASSG "5"
1317 #define BUILTIN_REG_ASSG "6"
1318 #define BUILTIN_SPEC_REG_ASSG "7"
1320 #define IS_BUILTIN_SPECIAL(builtincmd) ((builtincmd)->name[0] & 1)
1321 #define IS_BUILTIN_REGULAR(builtincmd) ((builtincmd)->name[0] & 2)
1322 #define IS_BUILTIN_ASSIGN(builtincmd) ((builtincmd)->name[0] & 4)
1324 static const struct builtincmd builtincmd[] = {
1325 { BUILTIN_SPEC_REG ".", dotcmd },
1326 { BUILTIN_SPEC_REG ":", truecmd },
1327 #ifdef CONFIG_ASH_ALIAS
1328 { BUILTIN_REG_ASSG "alias", aliascmd },
1331 { BUILTIN_REGULAR "bg", bgcmd },
1333 { BUILTIN_SPEC_REG "break", breakcmd },
1334 { BUILTIN_REGULAR "cd", cdcmd },
1335 { BUILTIN_NOSPEC "chdir", cdcmd },
1336 #ifdef CONFIG_ASH_CMDCMD
1337 { BUILTIN_REGULAR "command", commandcmd },
1339 { BUILTIN_SPEC_REG "continue", breakcmd },
1340 #ifdef CONFIG_ASH_BUILTIN_ECHO
1341 { BUILTIN_REGULAR "echo", echocmd },
1343 { BUILTIN_SPEC_REG "eval", evalcmd },
1344 { BUILTIN_SPEC_REG "exec", execcmd },
1345 { BUILTIN_SPEC_REG "exit", exitcmd },
1346 { BUILTIN_SPEC_REG_ASSG "export", exportcmd },
1347 { BUILTIN_REGULAR "false", falsecmd },
1349 { BUILTIN_REGULAR "fg", fgcmd },
1351 #ifdef CONFIG_ASH_GETOPTS
1352 { BUILTIN_REGULAR "getopts", getoptscmd },
1354 { BUILTIN_NOSPEC "hash", hashcmd },
1355 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
1356 { BUILTIN_NOSPEC "help", helpcmd },
1359 { BUILTIN_REGULAR "jobs", jobscmd },
1360 { BUILTIN_REGULAR "kill", killcmd },
1362 #ifdef CONFIG_ASH_MATH_SUPPORT
1363 { BUILTIN_NOSPEC "let", letcmd },
1365 { BUILTIN_ASSIGN "local", localcmd },
1366 { BUILTIN_NOSPEC "pwd", pwdcmd },
1367 { BUILTIN_REGULAR "read", readcmd },
1368 { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd },
1369 { BUILTIN_SPEC_REG "return", returncmd },
1370 { BUILTIN_SPEC_REG "set", setcmd },
1371 { BUILTIN_SPEC_REG "shift", shiftcmd },
1372 { BUILTIN_SPEC_REG "times", timescmd },
1373 { BUILTIN_SPEC_REG "trap", trapcmd },
1374 { BUILTIN_REGULAR "true", truecmd },
1375 { BUILTIN_NOSPEC "type", typecmd },
1376 { BUILTIN_NOSPEC "ulimit", ulimitcmd },
1377 { BUILTIN_REGULAR "umask", umaskcmd },
1378 #ifdef CONFIG_ASH_ALIAS
1379 { BUILTIN_REGULAR "unalias", unaliascmd },
1381 { BUILTIN_SPEC_REG "unset", unsetcmd },
1382 { BUILTIN_REGULAR "wait", waitcmd },
1385 #define NUMBUILTINS (sizeof (builtincmd) / sizeof (struct builtincmd) )
1393 const struct builtincmd *cmd;
1394 struct funcnode *func;
1399 /* action to find_command() */
1400 #define DO_ERR 0x01 /* prints errors */
1401 #define DO_ABS 0x02 /* checks absolute paths */
1402 #define DO_NOFUNC 0x04 /* don't return shell functions, for command */
1403 #define DO_ALTPATH 0x08 /* using alternate path */
1404 #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */
1406 static const char *pathopt; /* set by padvance */
1408 static void shellexec(char **, const char *, int)
1409 __attribute__((__noreturn__));
1410 static char *padvance(const char **, const char *);
1411 static void find_command(char *, struct cmdentry *, int, const char *);
1412 static struct builtincmd *find_builtin(const char *);
1413 static void hashcd(void);
1414 static void changepath(const char *);
1415 static void defun(char *, union node *);
1416 static void unsetfunc(const char *);
1418 #ifdef CONFIG_ASH_MATH_SUPPORT_64
1419 typedef int64_t arith_t;
1421 typedef long arith_t;
1424 #ifdef CONFIG_ASH_MATH_SUPPORT
1425 static arith_t dash_arith(const char *);
1426 static arith_t arith(const char *expr, int *perrcode);
1429 #ifdef CONFIG_ASH_RANDOM_SUPPORT
1430 static unsigned long rseed;
1431 static void change_random(const char *);
1432 # ifndef DYNAMIC_VAR
1433 # define DYNAMIC_VAR
1437 /* $NetBSD: init.h,v 1.9 2002/11/24 22:35:40 christos Exp $ */
1439 static void reset(void);
1441 /* $NetBSD: var.h,v 1.21 2003/01/22 20:36:04 dsl Exp $ */
1448 #define VEXPORT 0x01 /* variable is exported */
1449 #define VREADONLY 0x02 /* variable cannot be modified */
1450 #define VSTRFIXED 0x04 /* variable struct is statically allocated */
1451 #define VTEXTFIXED 0x08 /* text is statically allocated */
1452 #define VSTACK 0x10 /* text is allocated on the stack */
1453 #define VUNSET 0x20 /* the variable is not set */
1454 #define VNOFUNC 0x40 /* don't call the callback function */
1455 #define VNOSET 0x80 /* do not set variable - just readonly test */
1456 #define VNOSAVE 0x100 /* when text is on the heap before setvareq */
1458 # define VDYNAMIC 0x200 /* dynamic variable */
1464 struct var *next; /* next entry in hash list */
1465 int flags; /* flags are defined above */
1466 const char *text; /* name=value */
1467 void (*func)(const char *); /* function to be called when */
1468 /* the variable gets set/unset */
1472 struct localvar *next; /* next local variable in list */
1473 struct var *vp; /* the variable that was made local */
1474 int flags; /* saved flags */
1475 const char *text; /* saved text */
1479 static struct localvar *localvars;
1485 #ifdef CONFIG_ASH_GETOPTS
1486 static void getoptsreset(const char *);
1489 #ifdef CONFIG_LOCALE_SUPPORT
1491 static void change_lc_all(const char *value);
1492 static void change_lc_ctype(const char *value);
1498 static const char defpathvar[] = "PATH=/usr/local/bin:/usr/bin:/sbin:/bin";
1500 static const char defifsvar[] = "IFS= \t\n";
1501 #define defifs (defifsvar + 4)
1503 static const char defifs[] = " \t\n";
1507 static struct var varinit[] = {
1509 { 0, VSTRFIXED|VTEXTFIXED, defifsvar, 0 },
1511 { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0", 0 },
1514 #ifdef CONFIG_ASH_MAIL
1515 { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0", changemail },
1516 { 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail },
1519 { 0, VSTRFIXED|VTEXTFIXED, defpathvar, changepath },
1520 { 0, VSTRFIXED|VTEXTFIXED, "PS1=$ ", 0 },
1521 { 0, VSTRFIXED|VTEXTFIXED, "PS2=> ", 0 },
1522 { 0, VSTRFIXED|VTEXTFIXED, "PS4=+ ", 0 },
1523 #ifdef CONFIG_ASH_GETOPTS
1524 { 0, VSTRFIXED|VTEXTFIXED, "OPTIND=1", getoptsreset },
1526 #ifdef CONFIG_ASH_RANDOM_SUPPORT
1527 {0, VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random },
1529 #ifdef CONFIG_LOCALE_SUPPORT
1530 {0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_ALL\0", change_lc_all },
1531 {0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_CTYPE\0", change_lc_ctype },
1533 #ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
1534 {0, VSTRFIXED | VTEXTFIXED | VUNSET, "HISTFILE\0", NULL },
1538 #define vifs varinit[0]
1539 #ifdef CONFIG_ASH_MAIL
1540 #define vmail (&vifs)[1]
1541 #define vmpath (&vmail)[1]
1545 #define vpath (&vmpath)[1]
1546 #define vps1 (&vpath)[1]
1547 #define vps2 (&vps1)[1]
1548 #define vps4 (&vps2)[1]
1549 #define voptind (&vps4)[1]
1550 #ifdef CONFIG_ASH_GETOPTS
1551 #define vrandom (&voptind)[1]
1553 #define vrandom (&vps4)[1]
1555 #define defpath (defpathvar + 5)
1558 * The following macros access the values of the above variables.
1559 * They have to skip over the name. They return the null string
1560 * for unset variables.
1563 #define ifsval() (vifs.text + 4)
1564 #define ifsset() ((vifs.flags & VUNSET) == 0)
1565 #define mailval() (vmail.text + 5)
1566 #define mpathval() (vmpath.text + 9)
1567 #define pathval() (vpath.text + 5)
1568 #define ps1val() (vps1.text + 4)
1569 #define ps2val() (vps2.text + 4)
1570 #define ps4val() (vps4.text + 4)
1571 #define optindval() (voptind.text + 7)
1573 #define mpathset() ((vmpath.flags & VUNSET) == 0)
1575 static void setvar(const char *, const char *, int);
1576 static void setvareq(char *, int);
1577 static void listsetvar(struct strlist *, int);
1578 static char *lookupvar(const char *);
1579 static char *bltinlookup(const char *);
1580 static char **listvars(int, int, char ***);
1581 #define environment() listvars(VEXPORT, VUNSET, 0)
1582 static int showvars(const char *, int, int);
1583 static void poplocalvars(void);
1584 static int unsetvar(const char *);
1585 #ifdef CONFIG_ASH_GETOPTS
1586 static int setvarsafe(const char *, const char *, int);
1588 static int varcmp(const char *, const char *);
1589 static struct var **hashvar(const char *);
1592 static inline int varequal(const char *a, const char *b) {
1593 return !varcmp(a, b);
1597 static int loopnest; /* current loop nesting level */
1600 * The parsefile structure pointed to by the global variable parsefile
1601 * contains information about the current file being read.
1606 struct redirtab *next;
1611 static struct redirtab *redirlist;
1612 static int nullredirs;
1614 extern char **environ;
1616 /* $NetBSD: output.h,v 1.16 2002/11/24 22:35:42 christos Exp $ */
1619 static void outstr(const char *, FILE *);
1620 static void outcslow(int, FILE *);
1621 static void flushall(void);
1622 static void flusherr(void);
1623 static int out1fmt(const char *, ...)
1624 __attribute__((__format__(__printf__,1,2)));
1625 static int fmtstr(char *, size_t, const char *, ...)
1626 __attribute__((__format__(__printf__,3,4)));
1628 static int preverrout_fd; /* save fd2 before print debug if xflag is set. */
1631 static void out1str(const char *p)
1636 static void out2str(const char *p)
1643 * Initialization code.
1647 * This routine initializes the builtin variables.
1658 * PS1 depends on uid
1660 #if defined(CONFIG_FEATURE_COMMAND_EDITING) && defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
1661 vps1.text = "PS1=\\w \\$ ";
1664 vps1.text = "PS1=# ";
1667 end = vp + sizeof(varinit) / sizeof(varinit[0]);
1669 vpp = hashvar(vp->text);
1672 } while (++vp < end);
1681 basepf.nextc = basepf.buf = basebuf;
1686 signal(SIGCHLD, SIG_DFL);
1694 struct stat st1, st2;
1697 for (envp = environ ; envp && *envp ; envp++) {
1698 if (strchr(*envp, '=')) {
1699 setvareq(*envp, VEXPORT|VTEXTFIXED);
1703 snprintf(ppid, sizeof(ppid), "%d", (int) getppid());
1704 setvar("PPID", ppid, 0);
1706 p = lookupvar("PWD");
1708 if (*p != '/' || stat(p, &st1) || stat(".", &st2) ||
1709 st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
1715 /* PEOF (the end of file marker) */
1718 * The input line number. Input.c just defines this variable, and saves
1719 * and restores it when files are pushed and popped. The user of this
1720 * package must set its value.
1723 static int pgetc(void);
1724 static int pgetc2(void);
1725 static int preadbuffer(void);
1726 static void pungetc(void);
1727 static void pushstring(char *, void *);
1728 static void popstring(void);
1729 static void setinputfile(const char *, int);
1730 static void setinputfd(int, int);
1731 static void setinputstring(char *);
1732 static void popfile(void);
1733 static void popallfiles(void);
1734 static void closescript(void);
1737 /* $NetBSD: jobs.h,v 1.17 2003/01/22 20:36:04 dsl Exp $ */
1740 /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */
1743 #define FORK_NOJOB 2
1745 /* mode flags for showjob(s) */
1746 #define SHOW_PGID 0x01 /* only show pgid - for jobs -p */
1747 #define SHOW_PID 0x04 /* include process pid */
1748 #define SHOW_CHANGED 0x08 /* only jobs whose state has changed */
1752 * A job structure contains information about a job. A job is either a
1753 * single process or a set of processes contained in a pipeline. In the
1754 * latter case, pidlist will be non-NULL, and will point to a -1 terminated
1759 pid_t pid; /* process id */
1760 int status; /* last process status from wait() */
1761 char *cmd; /* text of command being run */
1765 struct procstat ps0; /* status of process */
1766 struct procstat *ps; /* status or processes when more than one */
1768 int stopstatus; /* status of a stopped job */
1771 nprocs: 16, /* number of processes */
1773 #define JOBRUNNING 0 /* at least one proc running */
1774 #define JOBSTOPPED 1 /* all procs are stopped */
1775 #define JOBDONE 2 /* all procs are completed */
1777 sigint: 1, /* job was killed by SIGINT */
1778 jobctl: 1, /* job running under job control */
1780 waited: 1, /* true if this entry has been waited for */
1781 used: 1, /* true if this entry is in used */
1782 changed: 1; /* true if status has changed */
1783 struct job *prev_job; /* previous job */
1786 static pid_t backgndpid; /* pid of last background process */
1787 static int job_warning; /* user was warned about stopped jobs */
1789 static int jobctl; /* true if doing job control */
1792 static struct job *makejob(union node *, int);
1793 static int forkshell(struct job *, union node *, int);
1794 static int waitforjob(struct job *);
1795 static int stoppedjobs(void);
1798 #define setjobctl(on) /* do nothing */
1800 static void setjobctl(int);
1801 static void showjobs(FILE *, int);
1804 /* $NetBSD: main.h,v 1.9 2002/11/24 22:35:41 christos Exp $ */
1807 /* pid of main shell */
1809 /* true if we aren't a child of the main shell */
1810 static int rootshell;
1812 static void readcmdfile(char *);
1813 static void cmdloop(int);
1815 /* $NetBSD: memalloc.h,v 1.13 2003/01/22 20:36:04 dsl Exp $ */
1819 struct stack_block *stackp;
1822 struct stackmark *marknext;
1825 /* minimum size of a block */
1826 #define MINSIZE SHELL_ALIGN(504)
1828 struct stack_block {
1829 struct stack_block *prev;
1830 char space[MINSIZE];
1833 static struct stack_block stackbase;
1834 static struct stack_block *stackp = &stackbase;
1835 static struct stackmark *markp;
1836 static char *stacknxt = stackbase.space;
1837 static size_t stacknleft = MINSIZE;
1838 static char *sstrend = stackbase.space + MINSIZE;
1839 static int herefd = -1;
1842 static pointer ckmalloc(size_t);
1843 static pointer ckrealloc(pointer, size_t);
1844 static char *savestr(const char *);
1845 static pointer stalloc(size_t);
1846 static void stunalloc(pointer);
1847 static void setstackmark(struct stackmark *);
1848 static void popstackmark(struct stackmark *);
1849 static void growstackblock(void);
1850 static void *growstackstr(void);
1851 static char *makestrspace(size_t, char *);
1852 static char *stnputs(const char *, size_t, char *);
1853 static char *stputs(const char *, char *);
1856 static inline char *_STPUTC(char c, char *p) {
1863 #define stackblock() ((void *)stacknxt)
1864 #define stackblocksize() stacknleft
1865 #define STARTSTACKSTR(p) ((p) = stackblock())
1866 #define STPUTC(c, p) ((p) = _STPUTC((c), (p)))
1867 #define CHECKSTRSPACE(n, p) \
1871 size_t m = sstrend - q; \
1873 (p) = makestrspace(l, q); \
1876 #define USTPUTC(c, p) (*p++ = (c))
1877 #define STACKSTRNUL(p) ((p) == sstrend? (p = growstackstr(), *p = '\0') : (*p = '\0'))
1878 #define STUNPUTC(p) (--p)
1879 #define STTOPC(p) p[-1]
1880 #define STADJUST(amount, p) (p += (amount))
1882 #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock())
1883 #define ungrabstackstr(s, p) stunalloc((s))
1884 #define stackstrend() ((void *)sstrend)
1886 #define ckfree(p) free((pointer)(p))
1888 /* $NetBSD: mystring.h,v 1.10 2002/11/24 22:35:42 christos Exp $ */
1891 #define DOLATSTRLEN 4
1893 static char *prefix(const char *, const char *);
1894 static int number(const char *);
1895 static int is_number(const char *);
1896 static char *single_quote(const char *);
1897 static char *sstrdup(const char *);
1899 #define equal(s1, s2) (strcmp(s1, s2) == 0)
1900 #define scopy(s1, s2) ((void)strcpy(s2, s1))
1902 /* $NetBSD: options.h,v 1.16 2003/01/22 20:36:04 dsl Exp $ */
1905 int nparam; /* # of positional parameters (without $0) */
1906 unsigned char malloc; /* if parameter list dynamically allocated */
1907 char **p; /* parameter list */
1908 #ifdef CONFIG_ASH_GETOPTS
1909 int optind; /* next parameter to be processed by getopts */
1910 int optoff; /* used by getopts */
1915 #define eflag optlist[0]
1916 #define fflag optlist[1]
1917 #define Iflag optlist[2]
1918 #define iflag optlist[3]
1919 #define mflag optlist[4]
1920 #define nflag optlist[5]
1921 #define sflag optlist[6]
1922 #define xflag optlist[7]
1923 #define vflag optlist[8]
1924 #define Cflag optlist[9]
1925 #define aflag optlist[10]
1926 #define bflag optlist[11]
1927 #define uflag optlist[12]
1928 #define qflag optlist[13]
1929 #define viflag optlist[14]
1932 #define nolog optlist[15]
1933 #define debug optlist[16]
1936 #ifndef CONFIG_FEATURE_COMMAND_EDITING_VI
1937 #define setvimode(on) viflag = 0 /* forcibly keep the option off */
1940 /* $NetBSD: options.c,v 1.33 2003/01/22 20:36:04 dsl Exp $ */
1943 static const char *const optletters_optnames[] = {
1965 #define optletters(n) optletters_optnames[(n)][0]
1966 #define optnames(n) (&optletters_optnames[(n)][1])
1968 #define NOPTS (sizeof(optletters_optnames)/sizeof(optletters_optnames[0]))
1970 static char optlist[NOPTS];
1973 static char *arg0; /* value of $0 */
1974 static struct shparam shellparam; /* $@ current positional parameters */
1975 static char **argptr; /* argument list for builtin commands */
1976 static char *optionarg; /* set by nextopt (like getopt) */
1977 static char *optptr; /* used by nextopt */
1979 static char *minusc; /* argument to -c option */
1982 static void procargs(int, char **);
1983 static void optschanged(void);
1984 static void setparam(char **);
1985 static void freeparam(volatile struct shparam *);
1986 static int shiftcmd(int, char **);
1987 static int setcmd(int, char **);
1988 static int nextopt(const char *);
1990 /* $NetBSD: redir.h,v 1.14 2002/11/24 22:35:43 christos Exp $ */
1992 /* flags passed to redirect */
1993 #define REDIR_PUSH 01 /* save previous values of file descriptors */
1994 #define REDIR_SAVEFD2 03 /* set preverrout */
1997 static void redirect(union node *, int);
1998 static void popredir(int);
1999 static void clearredir(int);
2000 static int copyfd(int, int);
2001 static int redirectsafe(union node *, int);
2003 /* $NetBSD: show.h,v 1.6 2003/01/22 20:36:04 dsl Exp $ */
2007 static void showtree(union node *);
2008 static void trace(const char *, ...);
2009 static void tracev(const char *, va_list);
2010 static void trargs(char **);
2011 static void trputc(int);
2012 static void trputs(const char *);
2013 static void opentrace(void);
2016 /* $NetBSD: trap.h,v 1.16 2002/11/24 22:35:43 christos Exp $ */
2019 /* trap handler commands */
2020 static char *trap[NSIG];
2021 /* current value of signal */
2022 static char sigmode[NSIG - 1];
2023 /* indicates specified signal received */
2024 static char gotsig[NSIG - 1];
2026 static void clear_traps(void);
2027 static void setsignal(int);
2028 static void ignoresig(int);
2029 static void onsig(int);
2030 static void dotrap(void);
2031 static void setinteractive(int);
2032 static void exitshell(void) __attribute__((__noreturn__));
2033 static int decode_signal(const char *, int);
2036 * This routine is called when an error or an interrupt occurs in an
2037 * interactive shell and control is returned to the main command loop.
2052 parselleft = parsenleft = 0; /* clear input buffer */
2056 /* from parser.c: */
2069 #ifdef CONFIG_ASH_ALIAS
2070 static struct alias *atab[ATABSIZE];
2072 static void setalias(const char *, const char *);
2073 static struct alias *freealias(struct alias *);
2074 static struct alias **__lookupalias(const char *);
2077 setalias(const char *name, const char *val)
2079 struct alias *ap, **app;
2081 app = __lookupalias(name);
2085 if (!(ap->flag & ALIASINUSE)) {
2088 ap->val = savestr(val);
2089 ap->flag &= ~ALIASDEAD;
2092 ap = ckmalloc(sizeof (struct alias));
2093 ap->name = savestr(name);
2094 ap->val = savestr(val);
2103 unalias(const char *name)
2107 app = __lookupalias(name);
2111 *app = freealias(*app);
2122 struct alias *ap, **app;
2126 for (i = 0; i < ATABSIZE; i++) {
2128 for (ap = *app; ap; ap = *app) {
2129 *app = freealias(*app);
2138 static struct alias *
2139 lookupalias(const char *name, int check)
2141 struct alias *ap = *__lookupalias(name);
2143 if (check && ap && (ap->flag & ALIASINUSE))
2149 * TODO - sort output
2152 aliascmd(int argc, char **argv)
2161 for (i = 0; i < ATABSIZE; i++)
2162 for (ap = atab[i]; ap; ap = ap->next) {
2167 while ((n = *++argv) != NULL) {
2168 if ((v = strchr(n+1, '=')) == NULL) { /* n+1: funny ksh stuff */
2169 if ((ap = *__lookupalias(n)) == NULL) {
2170 fprintf(stderr, "%s: %s not found\n", "alias", n);
2184 unaliascmd(int argc, char **argv)
2188 while ((i = nextopt("a")) != '\0') {
2194 for (i = 0; *argptr; argptr++) {
2195 if (unalias(*argptr)) {
2196 fprintf(stderr, "%s: %s not found\n", "unalias", *argptr);
2204 static struct alias *
2205 freealias(struct alias *ap) {
2208 if (ap->flag & ALIASINUSE) {
2209 ap->flag |= ALIASDEAD;
2221 printalias(const struct alias *ap) {
2222 out1fmt("%s=%s\n", ap->name, single_quote(ap->val));
2225 static struct alias **
2226 __lookupalias(const char *name) {
2227 unsigned int hashval;
2234 ch = (unsigned char)*p;
2238 ch = (unsigned char)*++p;
2240 app = &atab[hashval % ATABSIZE];
2242 for (; *app; app = &(*app)->next) {
2243 if (equal(name, (*app)->name)) {
2250 #endif /* CONFIG_ASH_ALIAS */
2253 /* $NetBSD: cd.c,v 1.30 2003/01/22 20:36:03 dsl Exp $ */
2256 * The cd and pwd commands.
2259 #define CD_PHYSICAL 1
2262 static int docd(const char *, int);
2263 static int cdopt(void);
2265 static char *curdir = nullstr; /* current working directory */
2266 static char *physdir = nullstr; /* physical working directory */
2275 while ((i = nextopt("LP"))) {
2277 flags ^= CD_PHYSICAL;
2286 cdcmd(int argc, char **argv)
2298 dest = bltinlookup(homestr);
2299 else if (dest[0] == '-' && dest[1] == '\0') {
2300 dest = bltinlookup("OLDPWD");
2322 if (!(path = bltinlookup("CDPATH"))) {
2330 p = padvance(&path, dest);
2331 if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) {
2335 if (!docd(p, flags))
2340 error("can't cd to %s", dest);
2343 if (flags & CD_PRINT)
2344 out1fmt(snlfmt, curdir);
2350 * Update curdir (the name of the current directory) in response to a
2354 static inline const char *
2355 updatepwd(const char *dir)
2362 cdcomppath = sstrdup(dir);
2365 if (curdir == nullstr)
2367 new = stputs(curdir, new);
2369 new = makestrspace(strlen(dir) + 2, new);
2370 lim = stackblock() + 1;
2374 if (new > lim && *lim == '/')
2379 if (dir[1] == '/' && dir[2] != '/') {
2385 p = strtok(cdcomppath, "/");
2389 if (p[1] == '.' && p[2] == '\0') {
2396 } else if (p[1] == '\0')
2400 new = stputs(p, new);
2408 return stackblock();
2412 * Actually do the chdir. We also call hashcd to let the routines in exec.c
2413 * know that the current directory has changed.
2417 docd(const char *dest, int flags)
2419 const char *dir = 0;
2422 TRACE(("docd(\"%s\", %d) called\n", dest, flags));
2425 if (!(flags & CD_PHYSICAL)) {
2426 dir = updatepwd(dest);
2441 * Find out what the current directory is. If we already know the current
2442 * directory, this routine returns immediately.
2444 static inline char *
2447 char *dir = getcwd(0, 0);
2448 return dir ? dir : nullstr;
2452 pwdcmd(int argc, char **argv)
2455 const char *dir = curdir;
2459 if (physdir == nullstr)
2463 out1fmt(snlfmt, dir);
2468 setpwd(const char *val, int setold)
2472 oldcur = dir = curdir;
2475 setvar("OLDPWD", oldcur, VEXPORT);
2478 if (physdir != nullstr) {
2479 if (physdir != oldcur)
2483 if (oldcur == val || !val) {
2490 if (oldcur != dir && oldcur != nullstr) {
2495 setvar("PWD", dir, VEXPORT);
2498 /* $NetBSD: error.c,v 1.30 2003/01/22 20:36:03 dsl Exp $ */
2501 * Errors and exceptions.
2505 * Code to handle exceptions in C.
2510 static void exverror(int, const char *, va_list)
2511 __attribute__((__noreturn__));
2514 * Called to raise an exception. Since C doesn't include exceptions, we
2515 * just do a longjmp to the exception handler. The type of exception is
2516 * stored in the global variable "exception".
2523 if (handler == NULL)
2529 longjmp(handler->loc, 1);
2534 * Called from trap.c when a SIGINT is received. (If the user specifies
2535 * that SIGINT is to be trapped or ignored using the trap builtin, then
2536 * this routine is not called.) Suppressint is nonzero when interrupts
2537 * are held using the INTOFF macro. (The test for iflag is just
2538 * defensive programming.)
2548 if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
2549 if (!(rootshell && iflag)) {
2550 signal(SIGINT, SIG_DFL);
2560 exvwarning(const char *msg, va_list ap)
2565 fprintf(errs, "%s: ", arg0);
2567 const char *fmt = (!iflag || parsefile->fd) ?
2568 "%s: %d: " : "%s: ";
2569 fprintf(errs, fmt, commandname, startlinno);
2571 vfprintf(errs, msg, ap);
2572 outcslow('\n', errs);
2576 * Exverror is called to raise the error exception. If the second argument
2577 * is not NULL then error prints an error message using printf style
2578 * formatting. It then raises the error exception.
2581 exverror(int cond, const char *msg, va_list ap)
2585 TRACE(("exverror(%d, \"", cond));
2587 TRACE(("\") pid=%d\n", getpid()));
2589 TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
2592 exvwarning(msg, ap);
2601 error(const char *msg, ...)
2606 exverror(EXERROR, msg, ap);
2613 exerror(int cond, const char *msg, ...)
2618 exverror(cond, msg, ap);
2624 * error/warning routines for external builtins
2628 sh_warnx(const char *fmt, ...)
2633 exvwarning(fmt, ap);
2639 * Return a string describing an error. The returned string may be a
2640 * pointer to a static buffer that will be overwritten on the next call.
2641 * Action describes the operation that got the error.
2645 errmsg(int e, const char *em)
2647 if(e == ENOENT || e == ENOTDIR) {
2655 /* $NetBSD: eval.c,v 1.71 2003/01/23 03:33:16 rafal Exp $ */
2658 * Evaluate a command.
2661 /* flags in argument to evaltree */
2662 #define EV_EXIT 01 /* exit after evaluating tree */
2663 #define EV_TESTED 02 /* exit status is checked; ignore -e flag */
2664 #define EV_BACKCMD 04 /* command executing within back quotes */
2667 static void evalloop(union node *, int);
2668 static void evalfor(union node *, int);
2669 static void evalcase(union node *, int);
2670 static void evalsubshell(union node *, int);
2671 static void expredir(union node *);
2672 static void evalpipe(union node *, int);
2673 static void evalcommand(union node *, int);
2674 static int evalbltin(const struct builtincmd *, int, char **);
2675 static int evalfun(struct funcnode *, int, char **, int);
2676 static void prehash(union node *);
2677 static int bltincmd(int, char **);
2680 static const struct builtincmd bltin = {
2686 * Called to reset things after an exception.
2694 evalcmd(int argc, char **argv)
2703 STARTSTACKSTR(concat);
2706 concat = stputs(p, concat);
2707 if ((p = *ap++) == NULL)
2709 STPUTC(' ', concat);
2711 STPUTC('\0', concat);
2712 p = grabstackstr(concat);
2721 * Execute a command or commands contained in a string.
2728 struct stackmark smark;
2730 setstackmark(&smark);
2733 while ((n = parsecmd(0)) != NEOF) {
2735 popstackmark(&smark);
2740 popstackmark(&smark);
2746 * Evaluate a parse tree. The value is left in the global variable
2751 evaltree(union node *n, int flags)
2754 void (*evalfn)(union node *, int);
2758 TRACE(("evaltree(NULL) called\n"));
2761 TRACE(("pid %d, evaltree(%p: %d, %d) called\n",
2762 getpid(), n, n->type, flags));
2766 out1fmt("Node type = %d\n", n->type);
2771 evaltree(n->nnot.com, EV_TESTED);
2772 status = !exitstatus;
2775 expredir(n->nredir.redirect);
2776 status = redirectsafe(n->nredir.redirect, REDIR_PUSH);
2778 evaltree(n->nredir.n, flags & EV_TESTED);
2779 status = exitstatus;
2784 evalfn = evalcommand;
2786 if (eflag && !(flags & EV_TESTED))
2798 evalfn = evalsubshell;
2810 #error NAND + 1 != NOR
2812 #if NOR + 1 != NSEMI
2813 #error NOR + 1 != NSEMI
2815 isor = n->type - NAND;
2818 (flags | ((isor >> 1) - 1)) & EV_TESTED
2820 if (!exitstatus == isor)
2832 evaltree(n->nif.test, EV_TESTED);
2835 if (exitstatus == 0) {
2838 } else if (n->nif.elsepart) {
2839 n = n->nif.elsepart;
2844 defun(n->narg.text, n->narg.next);
2848 exitstatus = status;
2854 if (flags & EV_EXIT || checkexit & exitstatus)
2859 #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3)
2862 void evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__));
2866 evalloop(union node *n, int flags)
2876 evaltree(n->nbinary.ch1, EV_TESTED);
2878 skipping: if (evalskip == SKIPCONT && --skipcount <= 0) {
2882 if (evalskip == SKIPBREAK && --skipcount <= 0)
2887 if (n->type != NWHILE)
2891 evaltree(n->nbinary.ch2, flags);
2892 status = exitstatus;
2897 exitstatus = status;
2903 evalfor(union node *n, int flags)
2905 struct arglist arglist;
2908 struct stackmark smark;
2910 setstackmark(&smark);
2911 arglist.lastp = &arglist.list;
2912 for (argp = n->nfor.args ; argp ; argp = argp->narg.next) {
2913 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE | EXP_RECORD);
2918 *arglist.lastp = NULL;
2923 for (sp = arglist.list ; sp ; sp = sp->next) {
2924 setvar(n->nfor.var, sp->text, 0);
2925 evaltree(n->nfor.body, flags);
2927 if (evalskip == SKIPCONT && --skipcount <= 0) {
2931 if (evalskip == SKIPBREAK && --skipcount <= 0)
2938 popstackmark(&smark);
2944 evalcase(union node *n, int flags)
2948 struct arglist arglist;
2949 struct stackmark smark;
2951 setstackmark(&smark);
2952 arglist.lastp = &arglist.list;
2953 expandarg(n->ncase.expr, &arglist, EXP_TILDE);
2955 for (cp = n->ncase.cases ; cp && evalskip == 0 ; cp = cp->nclist.next) {
2956 for (patp = cp->nclist.pattern ; patp ; patp = patp->narg.next) {
2957 if (casematch(patp, arglist.list->text)) {
2958 if (evalskip == 0) {
2959 evaltree(cp->nclist.body, flags);
2966 popstackmark(&smark);
2972 * Kick off a subshell to evaluate a tree.
2976 evalsubshell(union node *n, int flags)
2979 int backgnd = (n->type == NBACKGND);
2982 expredir(n->nredir.redirect);
2983 if (!backgnd && flags & EV_EXIT && !trap[0])
2987 if (forkshell(jp, n, backgnd) == 0) {
2991 flags &=~ EV_TESTED;
2993 redirect(n->nredir.redirect, 0);
2994 evaltreenr(n->nredir.n, flags);
2999 status = waitforjob(jp);
3000 exitstatus = status;
3007 * Compute the names of the files in a redirection list.
3011 expredir(union node *n)
3015 for (redir = n ; redir ; redir = redir->nfile.next) {
3017 fn.lastp = &fn.list;
3018 switch (redir->type) {
3024 expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR);
3025 redir->nfile.expfname = fn.list->text;
3029 if (redir->ndup.vname) {
3030 expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE);
3031 fixredir(redir, fn.list->text, 1);
3041 * Evaluate a pipeline. All the processes in the pipeline are children
3042 * of the process creating the pipeline. (This differs from some versions
3043 * of the shell, which make the last process in a pipeline the parent
3048 evalpipe(union node *n, int flags)
3051 struct nodelist *lp;
3056 TRACE(("evalpipe(0x%lx) called\n", (long)n));
3058 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next)
3062 jp = makejob(n, pipelen);
3064 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
3068 if (pipe(pip) < 0) {
3070 error("Pipe call failed");
3073 if (forkshell(jp, lp->n, n->npipe.backgnd) == 0) {
3086 evaltreenr(lp->n, flags);
3094 if (n->npipe.backgnd == 0) {
3095 exitstatus = waitforjob(jp);
3096 TRACE(("evalpipe: job done exit status %d\n", exitstatus));
3104 * Execute a command inside back quotes. If it's a builtin command, we
3105 * want to save its output in a block obtained from malloc. Otherwise
3106 * we fork off a subprocess and get the output of the command via a pipe.
3107 * Should be called with interrupts off.
3111 evalbackcmd(union node *n, struct backcmd *result)
3123 saveherefd = herefd;
3131 error("Pipe call failed");
3133 if (forkshell(jp, n, FORK_NOJOB) == 0) {
3142 evaltreenr(n, EV_EXIT);
3146 result->fd = pip[0];
3149 herefd = saveherefd;
3151 TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n",
3152 result->fd, result->buf, result->nleft, result->jp));
3155 #ifdef CONFIG_ASH_CMDCMD
3156 static inline char **
3157 parse_command_args(char **argv, const char **path)
3169 if (c == '-' && !*cp) {
3179 /* run 'typecmd' for other options */
3182 } while ((c = *cp++));
3189 isassignment(const char *p)
3191 const char *q = endofname(p);
3197 #ifdef CONFIG_ASH_EXPAND_PRMT
3198 static const char *expandstr(const char *ps);
3200 #define expandstr(s) s
3204 * Execute a simple command.
3208 evalcommand(union node *cmd, int flags)
3210 struct stackmark smark;
3212 struct arglist arglist;
3213 struct arglist varlist;
3216 const struct strlist *sp;
3217 struct cmdentry cmdentry;
3225 struct builtincmd *bcmd;
3226 int pseudovarflag = 0;
3228 /* First expand the arguments. */
3229 TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags));
3230 setstackmark(&smark);
3231 back_exitstatus = 0;
3233 cmdentry.cmdtype = CMDBUILTIN;
3234 cmdentry.u.cmd = &bltin;
3235 varlist.lastp = &varlist.list;
3236 *varlist.lastp = NULL;
3237 arglist.lastp = &arglist.list;
3238 *arglist.lastp = NULL;
3243 bcmd = find_builtin(cmd->ncmd.args->narg.text);
3244 pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd);
3247 for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) {
3248 struct strlist **spp;
3250 spp = arglist.lastp;
3251 if (pseudovarflag && isassignment(argp->narg.text))
3252 expandarg(argp, &arglist, EXP_VARTILDE);
3254 expandarg(argp, &arglist, EXP_FULL | EXP_TILDE);
3256 for (sp = *spp; sp; sp = sp->next)
3260 argv = nargv = stalloc(sizeof (char *) * (argc + 1));
3261 for (sp = arglist.list ; sp ; sp = sp->next) {
3262 TRACE(("evalcommand arg: %s\n", sp->text));
3263 *nargv++ = sp->text;
3268 if (iflag && funcnest == 0 && argc > 0)
3269 lastarg = nargv[-1];
3272 expredir(cmd->ncmd.redirect);
3273 status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH|REDIR_SAVEFD2);
3276 for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) {
3277 struct strlist **spp;
3280 spp = varlist.lastp;
3281 expandarg(argp, &varlist, EXP_VARTILDE);
3284 * Modify the command lookup path, if a PATH= assignment
3288 if (varequal(p, path))
3292 /* Print the command if xflag is set. */
3295 const char *p = " %s";
3298 dprintf(preverrout_fd, p, expandstr(ps4val()));
3301 for(n = 0; n < 2; n++) {
3303 dprintf(preverrout_fd, p, sp->text);
3311 bb_full_write(preverrout_fd, "\n", 1);
3317 /* Now locate the command. */
3319 const char *oldpath;
3320 int cmd_flag = DO_ERR;
3325 find_command(argv[0], &cmdentry, cmd_flag, path);
3326 if (cmdentry.cmdtype == CMDUNKNOWN) {
3332 /* implement bltin and command here */
3333 if (cmdentry.cmdtype != CMDBUILTIN)
3336 spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd);
3337 if (cmdentry.u.cmd == EXECCMD)
3339 #ifdef CONFIG_ASH_CMDCMD
3340 if (cmdentry.u.cmd == COMMANDCMD) {
3343 nargv = parse_command_args(argv, &path);
3346 argc -= nargv - argv;
3348 cmd_flag |= DO_NOFUNC;
3356 /* We have a redirection error. */
3360 exitstatus = status;
3364 /* Execute the command. */
3365 switch (cmdentry.cmdtype) {
3367 /* Fork off a child process if necessary. */
3368 if (!(flags & EV_EXIT) || trap[0]) {
3370 jp = makejob(cmd, 1);
3371 if (forkshell(jp, cmd, FORK_FG) != 0) {
3372 exitstatus = waitforjob(jp);
3378 listsetvar(varlist.list, VEXPORT|VSTACK);
3379 shellexec(argv, path, cmdentry.u.index);
3383 cmdenviron = varlist.list;
3385 struct strlist *list = cmdenviron;
3387 if (spclbltin > 0 || argc == 0) {
3389 if (cmd_is_exec && argc > 1)
3392 listsetvar(list, i);
3394 if (evalbltin(cmdentry.u.cmd, argc, argv)) {
3409 exit_status = j + 128;
3410 exitstatus = exit_status;
3412 if (i == EXINT || spclbltin > 0) {
3414 longjmp(handler->loc, 1);
3421 listsetvar(varlist.list, 0);
3422 if (evalfun(cmdentry.u.func, argc, argv, flags))
3428 popredir(cmd_is_exec);
3430 /* dsl: I think this is intended to be used to support
3431 * '_' in 'vi' command mode during line editing...
3432 * However I implemented that within libedit itself.
3434 setvar("_", lastarg, 0);
3435 popstackmark(&smark);
3439 evalbltin(const struct builtincmd *cmd, int argc, char **argv) {
3440 char *volatile savecmdname;
3441 struct jmploc *volatile savehandler;
3442 struct jmploc jmploc;
3445 savecmdname = commandname;
3446 if ((i = setjmp(jmploc.loc)))
3448 savehandler = handler;
3450 commandname = argv[0];
3452 optptr = NULL; /* initialize nextopt */
3453 exitstatus = (*cmd->builtin)(argc, argv);
3456 exitstatus |= ferror(stdout);
3457 commandname = savecmdname;
3459 handler = savehandler;
3465 evalfun(struct funcnode *func, int argc, char **argv, int flags)
3467 volatile struct shparam saveparam;
3468 struct localvar *volatile savelocalvars;
3469 struct jmploc *volatile savehandler;
3470 struct jmploc jmploc;
3473 saveparam = shellparam;
3474 savelocalvars = localvars;
3475 if ((e = setjmp(jmploc.loc))) {
3479 savehandler = handler;
3482 shellparam.malloc = 0;
3485 shellparam.nparam = argc - 1;
3486 shellparam.p = argv + 1;
3487 #ifdef CONFIG_ASH_GETOPTS
3488 shellparam.optind = 1;
3489 shellparam.optoff = -1;
3492 evaltree(&func->n, flags & EV_TESTED);
3498 localvars = savelocalvars;
3499 freeparam(&shellparam);
3500 shellparam = saveparam;
3501 handler = savehandler;
3503 if (evalskip == SKIPFUNC) {
3512 goodname(const char *p)
3514 return !*endofname(p);
3518 * Search for a command. This is called before we fork so that the
3519 * location of the command will be available in the parent as well as
3520 * the child. The check for "goodname" is an overly conservative
3521 * check that the name will not be subject to expansion.
3525 prehash(union node *n)
3527 struct cmdentry entry;
3529 if (n->type == NCMD && n->ncmd.args)
3530 if (goodname(n->ncmd.args->narg.text))
3531 find_command(n->ncmd.args->narg.text, &entry, 0,
3538 * Builtin commands. Builtin commands whose functions are closely
3539 * tied to evaluation are implemented here.
3547 bltincmd(int argc, char **argv)
3550 * Preserve exitstatus of a previous possible redirection
3553 return back_exitstatus;
3558 * Handle break and continue commands. Break, continue, and return are
3559 * all handled by setting the evalskip flag. The evaluation routines
3560 * above all check this flag, and if it is set they start skipping
3561 * commands rather than executing them. The variable skipcount is
3562 * the number of loops to break/continue, or the number of function
3563 * levels to return. (The latter is always 1.) It should probably
3564 * be an error to break out of more loops than exist, but it isn't
3565 * in the standard shell so we don't make it one here.
3569 breakcmd(int argc, char **argv)
3571 int n = argc > 1 ? number(argv[1]) : 1;
3574 error(illnum, argv[1]);
3578 evalskip = (**argv == 'c')? SKIPCONT : SKIPBREAK;
3586 * The return command.
3590 returncmd(int argc, char **argv)
3592 int ret = argc > 1 ? number(argv[1]) : exitstatus;
3595 evalskip = SKIPFUNC;
3600 /* Do what ksh does; skip the rest of the file */
3601 evalskip = SKIPFILE;
3609 falsecmd(int argc, char **argv)
3616 truecmd(int argc, char **argv)
3623 execcmd(int argc, char **argv)
3626 iflag = 0; /* exit on error */
3629 shellexec(argv + 1, pathval(), 0);
3635 /* $NetBSD: exec.c,v 1.35 2003/01/22 20:36:04 dsl Exp $ */
3638 * When commands are first encountered, they are entered in a hash table.
3639 * This ensures that a full path search will not have to be done for them
3640 * on each invocation.
3642 * We should investigate converting to a linear search, even though that
3643 * would make the command name "hash" a misnomer.
3646 #define CMDTABLESIZE 31 /* should be prime */
3647 #define ARB 1 /* actual size determined at run time */
3652 struct tblentry *next; /* next entry in hash chain */
3653 union param param; /* definition of builtin function */
3654 short cmdtype; /* index identifying command */
3655 char rehash; /* if set, cd done since entry created */
3656 char cmdname[ARB]; /* name of command */
3660 static struct tblentry *cmdtable[CMDTABLESIZE];
3661 static int builtinloc = -1; /* index in path of %builtin, or -1 */
3664 static void tryexec(char *, char **, char **);
3665 static void clearcmdentry(int);
3666 static struct tblentry *cmdlookup(const char *, int);
3667 static void delete_cmd_entry(void);
3671 * Exec a program. Never returns. If you change this routine, you may
3672 * have to change the find_command routine as well.
3676 shellexec(char **argv, const char *path, int idx)
3683 envp = environment();
3684 if (strchr(argv[0], '/') != NULL
3685 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3686 || find_applet_by_name(argv[0])
3689 tryexec(argv[0], argv, envp);
3693 while ((cmdname = padvance(&path, argv[0])) != NULL) {
3694 if (--idx < 0 && pathopt == NULL) {
3695 tryexec(cmdname, argv, envp);
3696 if (errno != ENOENT && errno != ENOTDIR)
3703 /* Map to POSIX errors */
3715 TRACE(("shellexec failed for %s, errno %d, suppressint %d\n",
3716 argv[0], e, suppressint ));
3717 exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
3723 tryexec(char *cmd, char **argv, char **envp)
3726 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3727 if(find_applet_by_name(cmd) != NULL) {
3728 /* re-exec ourselves with the new arguments */
3729 execve("/proc/self/exe",argv,envp);
3730 /* If proc isn't mounted, try hardcoded path to busybox binary*/
3731 execve("/bin/busybox",argv,envp);
3732 /* If they called chroot or otherwise made the binary no longer
3733 * executable, fall through */
3740 execve(cmd, argv, envp);
3741 } while (errno == EINTR);
3743 execve(cmd, argv, envp);
3747 } else if (errno == ENOEXEC) {
3751 for (ap = argv; *ap; ap++)
3753 ap = new = ckmalloc((ap - argv + 2) * sizeof(char *));
3755 *ap = cmd = (char *)DEFAULT_SHELL;
3758 while ((*ap++ = *argv++))
3768 * Do a path search. The variable path (passed by reference) should be
3769 * set to the start of the path before the first call; padvance will update
3770 * this value as it proceeds. Successive calls to padvance will return
3771 * the possible path expansions in sequence. If an option (indicated by
3772 * a percent sign) appears in the path entry then the global variable
3773 * pathopt will be set to point to it; otherwise pathopt will be set to
3778 padvance(const char **path, const char *name)
3788 for (p = start ; *p && *p != ':' && *p != '%' ; p++);
3789 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
3790 while (stackblocksize() < len)
3794 memcpy(q, start, p - start);
3802 while (*p && *p != ':') p++;
3808 return stalloc(len);
3812 /*** Command hashing code ***/
3815 printentry(struct tblentry *cmdp)
3821 idx = cmdp->param.index;
3824 name = padvance(&path, cmdp->cmdname);
3826 } while (--idx >= 0);
3827 out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr));
3832 hashcmd(int argc, char **argv)
3834 struct tblentry **pp;
3835 struct tblentry *cmdp;
3837 struct cmdentry entry;
3840 while ((c = nextopt("r")) != '\0') {
3844 if (*argptr == NULL) {
3845 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
3846 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
3847 if (cmdp->cmdtype == CMDNORMAL)
3854 while ((name = *argptr) != NULL) {
3855 if ((cmdp = cmdlookup(name, 0)) != NULL
3856 && (cmdp->cmdtype == CMDNORMAL
3857 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
3859 find_command(name, &entry, DO_ERR, pathval());
3860 if (entry.cmdtype == CMDUNKNOWN)
3869 * Resolve a command name. If you change this routine, you may have to
3870 * change the shellexec routine as well.
3874 find_command(char *name, struct cmdentry *entry, int act, const char *path)
3876 struct tblentry *cmdp;
3883 struct builtincmd *bcmd;
3885 /* If name contains a slash, don't use PATH or hash table */
3886 if (strchr(name, '/') != NULL) {
3887 entry->u.index = -1;
3889 while (stat(name, &statb) < 0) {
3894 entry->cmdtype = CMDUNKNOWN;
3898 entry->cmdtype = CMDNORMAL;
3902 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
3903 if (find_applet_by_name(name)) {
3904 entry->cmdtype = CMDNORMAL;
3905 entry->u.index = -1;
3910 updatetbl = (path == pathval());
3913 if (strstr(path, "%builtin") != NULL)
3917 /* If name is in the table, check answer will be ok */
3918 if ((cmdp = cmdlookup(name, 0)) != NULL) {
3921 switch (cmdp->cmdtype) {
3939 } else if (cmdp->rehash == 0)
3940 /* if not invalidated by cd, we're done */
3944 /* If %builtin not in path, check for builtin next */
3945 bcmd = find_builtin(name);
3946 if (bcmd && (IS_BUILTIN_REGULAR(bcmd) || (
3947 act & DO_ALTPATH ? !(act & DO_ALTBLTIN) : builtinloc <= 0
3949 goto builtin_success;
3951 /* We have to search path. */
3952 prev = -1; /* where to start */
3953 if (cmdp && cmdp->rehash) { /* doing a rehash */
3954 if (cmdp->cmdtype == CMDBUILTIN)
3957 prev = cmdp->param.index;
3963 while ((fullname = padvance(&path, name)) != NULL) {
3964 stunalloc(fullname);
3967 if (prefix(pathopt, "builtin")) {
3969 goto builtin_success;
3971 } else if (!(act & DO_NOFUNC) &&
3972 prefix(pathopt, "func")) {
3975 /* ignore unimplemented options */
3979 /* if rehash, don't redo absolute path names */
3980 if (fullname[0] == '/' && idx <= prev) {
3983 TRACE(("searchexec \"%s\": no change\n", name));
3986 while (stat(fullname, &statb) < 0) {
3991 if (errno != ENOENT && errno != ENOTDIR)
3995 e = EACCES; /* if we fail, this will be the error */
3996 if (!S_ISREG(statb.st_mode))
3998 if (pathopt) { /* this is a %func directory */
3999 stalloc(strlen(fullname) + 1);
4000 readcmdfile(fullname);
4001 if ((cmdp = cmdlookup(name, 0)) == NULL ||
4002 cmdp->cmdtype != CMDFUNCTION)
4003 error("%s not defined in %s", name, fullname);
4004 stunalloc(fullname);
4007 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
4009 entry->cmdtype = CMDNORMAL;
4010 entry->u.index = idx;
4014 cmdp = cmdlookup(name, 1);
4015 cmdp->cmdtype = CMDNORMAL;
4016 cmdp->param.index = idx;
4021 /* We failed. If there was an entry for this command, delete it */
4022 if (cmdp && updatetbl)
4025 sh_warnx("%s: %s", name, errmsg(e, E_EXEC));
4026 entry->cmdtype = CMDUNKNOWN;
4031 entry->cmdtype = CMDBUILTIN;
4032 entry->u.cmd = bcmd;
4036 cmdp = cmdlookup(name, 1);
4037 cmdp->cmdtype = CMDBUILTIN;
4038 cmdp->param.cmd = bcmd;
4042 entry->cmdtype = cmdp->cmdtype;
4043 entry->u = cmdp->param;
4048 * Wrapper around strcmp for qsort/bsearch/...
4050 static int pstrcmp(const void *a, const void *b)
4052 return strcmp((const char *) a, (*(const char *const *) b) + 1);
4056 * Search the table of builtin commands.
4059 static struct builtincmd *
4060 find_builtin(const char *name)
4062 struct builtincmd *bp;
4065 name, builtincmd, NUMBUILTINS, sizeof(struct builtincmd),
4074 * Called when a cd is done. Marks all commands so the next time they
4075 * are executed they will be rehashed.
4081 struct tblentry **pp;
4082 struct tblentry *cmdp;
4084 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
4085 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
4086 if (cmdp->cmdtype == CMDNORMAL || (
4087 cmdp->cmdtype == CMDBUILTIN &&
4088 !(IS_BUILTIN_REGULAR(cmdp->param.cmd)) &&
4099 * Fix command hash table when PATH changed.
4100 * Called before PATH is changed. The argument is the new value of PATH;
4101 * pathval() still returns the old value at this point.
4102 * Called with interrupts off.
4106 changepath(const char *newval)
4108 const char *old, *new;
4115 firstchange = 9999; /* assume no change */
4121 if ((*old == '\0' && *new == ':')
4122 || (*old == ':' && *new == '\0'))
4124 old = new; /* ignore subsequent differences */
4128 if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin"))
4135 if (builtinloc < 0 && idx_bltin >= 0)
4136 builtinloc = idx_bltin; /* zap builtins */
4137 if (builtinloc >= 0 && idx_bltin < 0)
4139 clearcmdentry(firstchange);
4140 builtinloc = idx_bltin;
4145 * Clear out command entries. The argument specifies the first entry in
4146 * PATH which has changed.
4150 clearcmdentry(int firstchange)
4152 struct tblentry **tblp;
4153 struct tblentry **pp;
4154 struct tblentry *cmdp;
4157 for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
4159 while ((cmdp = *pp) != NULL) {
4160 if ((cmdp->cmdtype == CMDNORMAL &&
4161 cmdp->param.index >= firstchange)
4162 || (cmdp->cmdtype == CMDBUILTIN &&
4163 builtinloc >= firstchange)) {
4177 * Locate a command in the command hash table. If "add" is nonzero,
4178 * add the command to the table if it is not already present. The
4179 * variable "lastcmdentry" is set to point to the address of the link
4180 * pointing to the entry, so that delete_cmd_entry can delete the
4183 * Interrupts must be off if called with add != 0.
4186 static struct tblentry **lastcmdentry;
4189 static struct tblentry *
4190 cmdlookup(const char *name, int add)
4192 unsigned int hashval;
4194 struct tblentry *cmdp;
4195 struct tblentry **pp;
4198 hashval = (unsigned char)*p << 4;
4200 hashval += (unsigned char)*p++;
4202 pp = &cmdtable[hashval % CMDTABLESIZE];
4203 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
4204 if (equal(cmdp->cmdname, name))
4208 if (add && cmdp == NULL) {
4209 cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
4210 + strlen(name) + 1);
4212 cmdp->cmdtype = CMDUNKNOWN;
4213 strcpy(cmdp->cmdname, name);
4220 * Delete the command entry returned on the last lookup.
4224 delete_cmd_entry(void)
4226 struct tblentry *cmdp;
4229 cmdp = *lastcmdentry;
4230 *lastcmdentry = cmdp->next;
4231 if (cmdp->cmdtype == CMDFUNCTION)
4232 freefunc(cmdp->param.func);
4239 * Add a new command entry, replacing any existing command entry for
4240 * the same name - except special builtins.
4244 addcmdentry(char *name, struct cmdentry *entry)
4246 struct tblentry *cmdp;
4248 cmdp = cmdlookup(name, 1);
4249 if (cmdp->cmdtype == CMDFUNCTION) {
4250 freefunc(cmdp->param.func);
4252 cmdp->cmdtype = entry->cmdtype;
4253 cmdp->param = entry->u;
4258 * Make a copy of a parse tree.
4261 static inline struct funcnode *
4262 copyfunc(union node *n)
4267 funcblocksize = offsetof(struct funcnode, n);
4270 blocksize = funcblocksize;
4271 f = ckmalloc(blocksize + funcstringsize);
4272 funcblock = (char *) f + offsetof(struct funcnode, n);
4273 funcstring = (char *) f + blocksize;
4280 * Define a shell function.
4284 defun(char *name, union node *func)
4286 struct cmdentry entry;
4289 entry.cmdtype = CMDFUNCTION;
4290 entry.u.func = copyfunc(func);
4291 addcmdentry(name, &entry);
4297 * Delete a function if it exists.
4301 unsetfunc(const char *name)
4303 struct tblentry *cmdp;
4305 if ((cmdp = cmdlookup(name, 0)) != NULL &&
4306 cmdp->cmdtype == CMDFUNCTION)
4311 * Locate and print what a word is...
4315 #ifdef CONFIG_ASH_CMDCMD
4317 describe_command(char *command, int describe_command_verbose)
4319 #define describe_command_verbose 1
4321 describe_command(char *command)
4324 struct cmdentry entry;
4325 struct tblentry *cmdp;
4326 #ifdef CONFIG_ASH_ALIAS
4327 const struct alias *ap;
4329 const char *path = pathval();
4331 if (describe_command_verbose) {
4335 /* First look at the keywords */
4336 if (findkwd(command)) {
4337 out1str(describe_command_verbose ? " is a shell keyword" : command);
4341 #ifdef CONFIG_ASH_ALIAS
4342 /* Then look at the aliases */
4343 if ((ap = lookupalias(command, 0)) != NULL) {
4344 if (describe_command_verbose) {
4345 out1fmt(" is an alias for %s", ap->val);
4354 /* Then check if it is a tracked alias */
4355 if ((cmdp = cmdlookup(command, 0)) != NULL) {
4356 entry.cmdtype = cmdp->cmdtype;
4357 entry.u = cmdp->param;
4359 /* Finally use brute force */
4360 find_command(command, &entry, DO_ABS, path);
4363 switch (entry.cmdtype) {
4365 int j = entry.u.index;
4371 p = padvance(&path, command);
4375 if (describe_command_verbose) {
4377 (cmdp ? " a tracked alias for" : nullstr), p
4386 if (describe_command_verbose) {
4387 out1str(" is a shell function");
4394 if (describe_command_verbose) {
4395 out1fmt(" is a %sshell builtin",
4396 IS_BUILTIN_SPECIAL(entry.u.cmd) ?
4397 "special " : nullstr
4405 if (describe_command_verbose) {
4406 out1str(": not found\n");
4412 outstr("\n", stdout);
4417 typecmd(int argc, char **argv)
4422 for (i = 1; i < argc; i++) {
4423 #ifdef CONFIG_ASH_CMDCMD
4424 err |= describe_command(argv[i], 1);
4426 err |= describe_command(argv[i]);
4432 #ifdef CONFIG_ASH_CMDCMD
4434 commandcmd(int argc, char **argv)
4437 int default_path = 0;
4438 int verify_only = 0;
4439 int verbose_verify_only = 0;
4441 while ((c = nextopt("pvV")) != '\0')
4446 "command: nextopt returned character code 0%o\n", c);
4456 verbose_verify_only = 1;
4460 if (default_path + verify_only + verbose_verify_only > 1 ||
4463 "command [-p] command [arg ...]\n"
4464 "command {-v|-V} command\n");
4468 if (verify_only || verbose_verify_only) {
4469 return describe_command(*argptr, verbose_verify_only);
4476 /* $NetBSD: expand.c,v 1.56 2002/11/24 22:35:39 christos Exp $ */
4479 * Routines to expand arguments to commands. We have to deal with
4480 * backquotes, shell variables, and file metacharacters.
4486 #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */
4487 #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */
4488 #define RMESCAPE_QUOTED 0x4 /* Remove CTLESC unless in quotes */
4489 #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */
4490 #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */
4493 * Structure specifying which parts of the string should be searched
4494 * for IFS characters.
4498 struct ifsregion *next; /* next region in list */
4499 int begoff; /* offset of start of region */
4500 int endoff; /* offset of end of region */
4501 int nulonly; /* search for nul bytes only */
4504 /* output of current string */
4505 static char *expdest;
4506 /* list of back quote expressions */
4507 static struct nodelist *argbackq;
4508 /* first struct in list of ifs regions */
4509 static struct ifsregion ifsfirst;
4510 /* last struct in list */
4511 static struct ifsregion *ifslastp;
4512 /* holds expanded arg list */
4513 static struct arglist exparg;
4515 static void argstr(char *, int);
4516 static char *exptilde(char *, char *, int);
4517 static void expbackq(union node *, int, int);
4518 static const char *subevalvar(char *, char *, int, int, int, int, int);
4519 static char *evalvar(char *, int);
4520 static void strtodest(const char *, int, int);
4521 static void memtodest(const char *p, size_t len, int syntax, int quotes);
4522 static ssize_t varvalue(char *, int, int);
4523 static void recordregion(int, int, int);
4524 static void removerecordregions(int);
4525 static void ifsbreakup(char *, struct arglist *);
4526 static void ifsfree(void);
4527 static void expandmeta(struct strlist *, int);
4528 static int patmatch(char *, const char *);
4530 static int cvtnum(arith_t);
4531 static size_t esclen(const char *, const char *);
4532 static char *scanleft(char *, char *, char *, char *, int, int);
4533 static char *scanright(char *, char *, char *, char *, int, int);
4534 static void varunset(const char *, const char *, const char *, int)
4535 __attribute__((__noreturn__));
4538 #define pmatch(a, b) !fnmatch((a), (b), 0)
4540 * Prepare a pattern for a expmeta (internal glob(3)) call.
4542 * Returns an stalloced string.
4545 static inline char *
4546 preglob(const char *pattern, int quoted, int flag) {
4547 flag |= RMESCAPE_GLOB;
4549 flag |= RMESCAPE_QUOTED;
4551 return _rmescapes((char *)pattern, flag);
4556 esclen(const char *start, const char *p) {
4559 while (p > start && *--p == CTLESC) {
4567 * Expand shell variables and backquotes inside a here document.
4571 expandhere(union node *arg, int fd)
4574 expandarg(arg, (struct arglist *)NULL, 0);
4575 bb_full_write(fd, stackblock(), expdest - (char *)stackblock());
4580 * Perform variable substitution and command substitution on an argument,
4581 * placing the resulting list of arguments in arglist. If EXP_FULL is true,
4582 * perform splitting and file name expansion. When arglist is NULL, perform
4583 * here document expansion.
4587 expandarg(union node *arg, struct arglist *arglist, int flag)
4592 argbackq = arg->narg.backquote;
4593 STARTSTACKSTR(expdest);
4594 ifsfirst.next = NULL;
4596 argstr(arg->narg.text, flag);
4597 p = _STPUTC('\0', expdest);
4599 if (arglist == NULL) {
4600 return; /* here document expanded */
4602 p = grabstackstr(p);
4603 exparg.lastp = &exparg.list;
4607 if (flag & EXP_FULL) {
4608 ifsbreakup(p, &exparg);
4609 *exparg.lastp = NULL;
4610 exparg.lastp = &exparg.list;
4611 expandmeta(exparg.list, flag);
4613 if (flag & EXP_REDIR) /*XXX - for now, just remove escapes */
4615 sp = (struct strlist *)stalloc(sizeof (struct strlist));
4618 exparg.lastp = &sp->next;
4622 *exparg.lastp = NULL;
4624 *arglist->lastp = exparg.list;
4625 arglist->lastp = exparg.lastp;
4631 * Perform variable and command substitution. If EXP_FULL is set, output CTLESC
4632 * characters to allow for further processing. Otherwise treat
4633 * $@ like $* since no splitting will be performed.
4637 argstr(char *p, int flag)
4639 static const char spclchars[] = {
4647 CTLBACKQ | CTLQUOTE,
4648 #ifdef CONFIG_ASH_MATH_SUPPORT
4653 const char *reject = spclchars;
4655 int quotes = flag & (EXP_FULL | EXP_CASE); /* do CTLESC */
4656 int breakall = flag & EXP_WORD;
4661 if (!(flag & EXP_VARTILDE)) {
4663 } else if (flag & EXP_VARTILDE2) {
4668 if (flag & EXP_TILDE) {
4674 if (*q == CTLESC && (flag & EXP_QWORD))
4677 p = exptilde(p, q, flag);
4680 startloc = expdest - (char *)stackblock();
4682 length += strcspn(p + length, reject);
4684 if (c && (!(c & 0x80)
4685 #ifdef CONFIG_ASH_MATH_SUPPORT
4689 /* c == '=' || c == ':' || c == CTLENDARI */
4694 expdest = stnputs(p, length, expdest);
4695 newloc = expdest - (char *)stackblock();
4696 if (breakall && !inquotes && newloc > startloc) {
4697 recordregion(startloc, newloc, 0);
4708 if (flag & EXP_VARTILDE2) {
4712 flag |= EXP_VARTILDE2;
4717 * sort of a hack - expand tildes in variable
4718 * assignments (after the first '=' and after ':'s).
4727 case CTLENDVAR: /* ??? */
4730 /* "$@" syntax adherence hack */
4733 !memcmp(p, dolatstr, DOLATSTRLEN) &&
4734 (p[4] == CTLQUOTEMARK || (
4735 p[4] == CTLENDVAR &&
4736 p[5] == CTLQUOTEMARK
4739 p = evalvar(p + 1, flag) + 1;
4742 inquotes = !inquotes;
4755 p = evalvar(p, flag);
4759 case CTLBACKQ|CTLQUOTE:
4760 expbackq(argbackq->n, c, quotes);
4761 argbackq = argbackq->next;
4763 #ifdef CONFIG_ASH_MATH_SUPPORT
4776 exptilde(char *startp, char *p, int flag)
4782 int quotes = flag & (EXP_FULL | EXP_CASE);
4787 while ((c = *++p) != '\0') {
4794 if (flag & EXP_VARTILDE)
4804 if (*name == '\0') {
4805 if ((home = lookupvar(homestr)) == NULL)
4808 if ((pw = getpwnam(name)) == NULL)
4815 startloc = expdest - (char *)stackblock();
4816 strtodest(home, SQSYNTAX, quotes);
4817 recordregion(startloc, expdest - (char *)stackblock(), 0);
4826 removerecordregions(int endoff)
4828 if (ifslastp == NULL)
4831 if (ifsfirst.endoff > endoff) {
4832 while (ifsfirst.next != NULL) {
4833 struct ifsregion *ifsp;
4835 ifsp = ifsfirst.next->next;
4836 ckfree(ifsfirst.next);
4837 ifsfirst.next = ifsp;
4840 if (ifsfirst.begoff > endoff)
4843 ifslastp = &ifsfirst;
4844 ifsfirst.endoff = endoff;
4849 ifslastp = &ifsfirst;
4850 while (ifslastp->next && ifslastp->next->begoff < endoff)
4851 ifslastp=ifslastp->next;
4852 while (ifslastp->next != NULL) {
4853 struct ifsregion *ifsp;
4855 ifsp = ifslastp->next->next;
4856 ckfree(ifslastp->next);
4857 ifslastp->next = ifsp;
4860 if (ifslastp->endoff > endoff)
4861 ifslastp->endoff = endoff;
4865 #ifdef CONFIG_ASH_MATH_SUPPORT
4867 * Expand arithmetic expression. Backup to start of expression,
4868 * evaluate, place result in (backed up) result, adjust string position.
4881 * This routine is slightly over-complicated for
4882 * efficiency. Next we scan backwards looking for the
4883 * start of arithmetic.
4885 start = stackblock();
4892 while (*p != CTLARI) {
4896 error("missing CTLARI (shouldn't happen)");
4901 esc = esclen(start, p);
4911 removerecordregions(begoff);
4920 len = cvtnum(dash_arith(p + 2));
4923 recordregion(begoff, begoff + len, 0);
4928 * Expand stuff in backwards quotes.
4932 expbackq(union node *cmd, int quoted, int quotes)
4940 int syntax = quoted? DQSYNTAX : BASESYNTAX;
4941 struct stackmark smark;
4944 setstackmark(&smark);
4946 startloc = dest - (char *)stackblock();
4948 evalbackcmd(cmd, (struct backcmd *) &in);
4949 popstackmark(&smark);
4956 memtodest(p, i, syntax, quotes);
4960 i = safe_read(in.fd, buf, sizeof buf);
4961 TRACE(("expbackq: read returns %d\n", i));
4971 back_exitstatus = waitforjob(in.jp);
4975 /* Eat all trailing newlines */
4977 for (; dest > (char *)stackblock() && dest[-1] == '\n';)
4982 recordregion(startloc, dest - (char *)stackblock(), 0);
4983 TRACE(("evalbackq: size=%d: \"%.*s\"\n",
4984 (dest - (char *)stackblock()) - startloc,
4985 (dest - (char *)stackblock()) - startloc,
4986 stackblock() + startloc));
4991 scanleft(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
5002 const char *s = loc2;
5008 match = pmatch(str, s);
5012 if (quotes && *loc == CTLESC)
5022 scanright(char *startp, char *rmesc, char *rmescend, char *str, int quotes,
5029 for (loc = str - 1, loc2 = rmescend; loc >= startp; loc2--) {
5032 const char *s = loc2;
5037 match = pmatch(str, s);
5044 esc = esclen(startp, loc);
5056 subevalvar(char *p, char *str, int strloc, int subtype, int startloc, int varflags, int quotes)
5060 int saveherefd = herefd;
5061 struct nodelist *saveargbackq = argbackq;
5063 char *rmesc, *rmescend;
5065 char *(*scan)(char *, char *, char *, char *, int , int);
5068 argstr(p, subtype != VSASSIGN && subtype != VSQUESTION ? EXP_CASE : 0);
5069 STPUTC('\0', expdest);
5070 herefd = saveherefd;
5071 argbackq = saveargbackq;
5072 startp = stackblock() + startloc;
5076 setvar(str, startp, 0);
5077 amount = startp - expdest;
5078 STADJUST(amount, expdest);
5082 varunset(p, str, startp, varflags);
5086 subtype -= VSTRIMRIGHT;
5088 if (subtype < 0 || subtype > 3)
5093 rmescend = stackblock() + strloc;
5095 rmesc = _rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW);
5096 if (rmesc != startp) {
5098 startp = stackblock() + startloc;
5102 str = stackblock() + strloc;
5103 preglob(str, varflags & VSQUOTE, 0);
5105 /* zero = subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX */
5106 zero = subtype >> 1;
5107 /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */
5108 scan = (subtype & 1) ^ zero ? scanleft : scanright;
5110 loc = scan(startp, rmesc, rmescend, str, quotes, zero);
5113 memmove(startp, loc, str - loc);
5114 loc = startp + (str - loc) - 1;
5117 amount = loc - expdest;
5118 STADJUST(amount, expdest);
5125 * Expand a variable, and return a pointer to the next character in the
5129 evalvar(char *p, int flag)
5142 quotes = flag & (EXP_FULL | EXP_CASE);
5144 subtype = varflags & VSTYPE;
5145 quoted = varflags & VSQUOTE;
5147 easy = (!quoted || (*var == '@' && shellparam.nparam));
5148 startloc = expdest - (char *)stackblock();
5149 p = strchr(p, '=') + 1;
5152 varlen = varvalue(var, varflags, flag);
5153 if (varflags & VSNUL)
5156 if (subtype == VSPLUS) {
5157 varlen = -1 - varlen;
5161 if (subtype == VSMINUS) {
5165 p, flag | EXP_TILDE |
5166 (quoted ? EXP_QWORD : EXP_WORD)
5175 if (subtype == VSASSIGN || subtype == VSQUESTION) {
5177 if (subevalvar(p, var, 0, subtype, startloc,
5181 * Remove any recorded regions beyond
5184 removerecordregions(startloc);
5194 if (varlen < 0 && uflag)
5195 varunset(p, var, 0, 0);
5197 if (subtype == VSLENGTH) {
5198 cvtnum(varlen > 0 ? varlen : 0);
5202 if (subtype == VSNORMAL) {
5206 recordregion(startloc, expdest - (char *)stackblock(), quoted);
5215 case VSTRIMRIGHTMAX:
5224 * Terminate the string and start recording the pattern
5227 STPUTC('\0', expdest);
5228 patloc = expdest - (char *)stackblock();
5229 if (subevalvar(p, NULL, patloc, subtype,
5230 startloc, varflags, quotes) == 0) {
5231 int amount = expdest - (
5232 (char *)stackblock() + patloc - 1
5234 STADJUST(-amount, expdest);
5236 /* Remove any recorded regions beyond start of variable */
5237 removerecordregions(startloc);
5242 if (subtype != VSNORMAL) { /* skip to end of alternative */
5245 if ((c = *p++) == CTLESC)
5247 else if (c == CTLBACKQ || c == (CTLBACKQ|CTLQUOTE)) {
5249 argbackq = argbackq->next;
5250 } else if (c == CTLVAR) {
5251 if ((*p++ & VSTYPE) != VSNORMAL)
5253 } else if (c == CTLENDVAR) {
5264 * Put a string on the stack.
5268 memtodest(const char *p, size_t len, int syntax, int quotes) {
5271 q = makestrspace(len * 2, q);
5277 if (quotes && (SIT(c, syntax) == CCTL || SIT(c, syntax) == CBACK))
5287 strtodest(const char *p, int syntax, int quotes)
5289 memtodest(p, strlen(p), syntax, quotes);
5294 * Add the value of a specialized variable to the stack string.
5298 varvalue(char *name, int varflags, int flags)
5308 int quoted = varflags & VSQUOTE;
5309 int subtype = varflags & VSTYPE;
5310 int quotes = flags & (EXP_FULL | EXP_CASE);
5312 if (quoted && (flags & EXP_FULL))
5313 sep = 1 << CHAR_BIT;
5315 syntax = quoted ? DQSYNTAX : BASESYNTAX;
5324 num = shellparam.nparam;
5334 p = makestrspace(NOPTS, expdest);
5335 for (i = NOPTS - 1; i >= 0; i--) {
5337 USTPUTC(optletters(i), p);
5348 sep = ifsset() ? ifsval()[0] : ' ';
5349 if (quotes && (SIT(sep, syntax) == CCTL || SIT(sep, syntax) == CBACK))
5352 if (!(ap = shellparam.p))
5354 while ((p = *ap++)) {
5357 partlen = strlen(p);
5360 if (!(subtype == VSPLUS || subtype == VSLENGTH))
5361 memtodest(p, partlen, syntax, quotes);
5367 if (subtype == VSPLUS || subtype == VSLENGTH) {
5389 if (num < 0 || num > shellparam.nparam)
5391 p = num ? shellparam.p[num - 1] : arg0;
5394 p = lookupvar(name);
5400 if (!(subtype == VSPLUS || subtype == VSLENGTH))
5401 memtodest(p, len, syntax, quotes);
5405 if (subtype == VSPLUS || subtype == VSLENGTH)
5406 STADJUST(-len, expdest);
5412 * Record the fact that we have to scan this region of the
5413 * string for IFS characters.
5417 recordregion(int start, int end, int nulonly)
5419 struct ifsregion *ifsp;
5421 if (ifslastp == NULL) {
5425 ifsp = (struct ifsregion *)ckmalloc(sizeof (struct ifsregion));
5427 ifslastp->next = ifsp;
5431 ifslastp->begoff = start;
5432 ifslastp->endoff = end;
5433 ifslastp->nulonly = nulonly;
5438 * Break the argument string into pieces based upon IFS and add the
5439 * strings to the argument list. The regions of the string to be
5440 * searched for IFS characters have been stored by recordregion.
5443 ifsbreakup(char *string, struct arglist *arglist)
5445 struct ifsregion *ifsp;
5450 const char *ifs, *realifs;
5456 if (ifslastp != NULL) {
5459 realifs = ifsset() ? ifsval() : defifs;
5462 p = string + ifsp->begoff;
5463 nulonly = ifsp->nulonly;
5464 ifs = nulonly ? nullstr : realifs;
5466 while (p < string + ifsp->endoff) {
5470 if (strchr(ifs, *p)) {
5472 ifsspc = (strchr(defifs, *p) != NULL);
5473 /* Ignore IFS whitespace at start */
5474 if (q == start && ifsspc) {
5480 sp = (struct strlist *)stalloc(sizeof *sp);
5482 *arglist->lastp = sp;
5483 arglist->lastp = &sp->next;
5487 if (p >= string + ifsp->endoff) {
5493 if (strchr(ifs, *p) == NULL ) {
5496 } else if (strchr(defifs, *p) == NULL) {
5512 } while ((ifsp = ifsp->next) != NULL);
5521 sp = (struct strlist *)stalloc(sizeof *sp);
5523 *arglist->lastp = sp;
5524 arglist->lastp = &sp->next;
5530 struct ifsregion *p;
5535 struct ifsregion *ifsp;
5541 ifsfirst.next = NULL;
5545 static void expmeta(char *, char *);
5546 static struct strlist *expsort(struct strlist *);
5547 static struct strlist *msort(struct strlist *, int);
5549 static char *expdir;
5553 expandmeta(struct strlist *str, int flag)
5555 static const char metachars[] = {
5558 /* TODO - EXP_REDIR */
5561 struct strlist **savelastp;
5567 if (!strpbrk(str->text, metachars))
5569 savelastp = exparg.lastp;
5572 p = preglob(str->text, 0, RMESCAPE_ALLOC | RMESCAPE_HEAP);
5574 int i = strlen(str->text);
5575 expdir = ckmalloc(i < 2048 ? 2048 : i); /* XXX */
5583 if (exparg.lastp == savelastp) {
5588 *exparg.lastp = str;
5589 rmescapes(str->text);
5590 exparg.lastp = &str->next;
5592 *exparg.lastp = NULL;
5593 *savelastp = sp = expsort(*savelastp);
5594 while (sp->next != NULL)
5596 exparg.lastp = &sp->next;
5603 * Add a file name to the list.
5607 addfname(const char *name)
5611 sp = (struct strlist *)stalloc(sizeof *sp);
5612 sp->text = sstrdup(name);
5614 exparg.lastp = &sp->next;
5619 * Do metacharacter (i.e. *, ?, [...]) expansion.
5623 expmeta(char *enddir, char *name)
5638 for (p = name; *p; p++) {
5639 if (*p == '*' || *p == '?')
5641 else if (*p == '[') {
5648 if (*q == '/' || *q == '\0')
5655 } else if (*p == '\\')
5657 else if (*p == '/') {
5664 if (metaflag == 0) { /* we've reached the end of the file name */
5665 if (enddir != expdir)
5673 if (metaflag == 0 || lstat(expdir, &statb) >= 0)
5684 } while (p < start);
5686 if (enddir == expdir) {
5688 } else if (enddir == expdir + 1 && *expdir == '/') {
5694 if ((dirp = opendir(cp)) == NULL)
5696 if (enddir != expdir)
5698 if (*endname == 0) {
5710 while (! intpending && (dp = readdir(dirp)) != NULL) {
5711 if (dp->d_name[0] == '.' && ! matchdot)
5713 if (pmatch(start, dp->d_name)) {
5715 scopy(dp->d_name, enddir);
5718 for (p = enddir, cp = dp->d_name;
5719 (*p++ = *cp++) != '\0';)
5722 expmeta(p, endname);
5732 * Sort the results of file name expansion. It calculates the number of
5733 * strings to sort and then calls msort (short for merge sort) to do the
5737 static struct strlist *
5738 expsort(struct strlist *str)
5744 for (sp = str ; sp ; sp = sp->next)
5746 return msort(str, len);
5750 static struct strlist *
5751 msort(struct strlist *list, int len)
5753 struct strlist *p, *q = NULL;
5754 struct strlist **lpp;
5762 for (n = half ; --n >= 0 ; ) {
5766 q->next = NULL; /* terminate first half of list */
5767 q = msort(list, half); /* sort first half of list */
5768 p = msort(p, len - half); /* sort second half */
5771 #ifdef CONFIG_LOCALE_SUPPORT
5772 if (strcoll(p->text, q->text) < 0)
5774 if (strcmp(p->text, q->text) < 0)
5779 if ((p = *lpp) == NULL) {
5786 if ((q = *lpp) == NULL) {
5797 * Returns true if the pattern matches the string.
5801 patmatch(char *pattern, const char *string)
5803 return pmatch(preglob(pattern, 0, 0), string);
5808 * Remove any CTLESC characters from a string.
5812 _rmescapes(char *str, int flag)
5815 static const char qchars[] = { CTLESC, CTLQUOTEMARK, 0 };
5820 p = strpbrk(str, qchars);
5826 if (flag & RMESCAPE_ALLOC) {
5827 size_t len = p - str;
5828 size_t fulllen = len + strlen(p) + 1;
5830 if (flag & RMESCAPE_GROW) {
5831 r = makestrspace(fulllen, expdest);
5832 } else if (flag & RMESCAPE_HEAP) {
5833 r = ckmalloc(fulllen);
5835 r = stalloc(fulllen);
5839 q = mempcpy(q, str, len);
5842 inquotes = (flag & RMESCAPE_QUOTED) ^ RMESCAPE_QUOTED;
5843 globbing = flag & RMESCAPE_GLOB;
5844 notescaped = globbing;
5846 if (*p == CTLQUOTEMARK) {
5847 inquotes = ~inquotes;
5849 notescaped = globbing;
5853 /* naked back slash */
5859 if (notescaped && inquotes && *p != '/') {
5863 notescaped = globbing;
5868 if (flag & RMESCAPE_GROW) {
5870 STADJUST(q - r + 1, expdest);
5877 * See if a pattern matches in a case statement.
5881 casematch(union node *pattern, char *val)
5883 struct stackmark smark;
5886 setstackmark(&smark);
5887 argbackq = pattern->narg.backquote;
5888 STARTSTACKSTR(expdest);
5890 argstr(pattern->narg.text, EXP_TILDE | EXP_CASE);
5891 STACKSTRNUL(expdest);
5892 result = patmatch(stackblock(), val);
5893 popstackmark(&smark);
5906 expdest = makestrspace(32, expdest);
5907 #ifdef CONFIG_ASH_MATH_SUPPORT_64
5908 len = fmtstr(expdest, 32, "%lld", (long long) num);
5910 len = fmtstr(expdest, 32, "%ld", num);
5912 STADJUST(len, expdest);
5917 varunset(const char *end, const char *var, const char *umsg, int varflags)
5923 msg = "parameter not set";
5925 if (*end == CTLENDVAR) {
5926 if (varflags & VSNUL)
5931 error("%.*s: %s%s", end - var - 1, var, msg, tail);
5935 /* $NetBSD: input.c,v 1.37 2002/11/24 22:35:40 christos Exp $ */
5938 * This implements the input routines used by the parser.
5941 #define EOF_NLEFT -99 /* value of parsenleft when EOF pushed back */
5942 #define IBUFSIZ (BUFSIZ + 1)
5944 static void pushfile(void);
5947 * Read a character from the script, returning PEOF on end of file.
5948 * Nul characters in the input are silently discarded.
5951 #define pgetc_as_macro() (--parsenleft >= 0? *parsenextc++ : preadbuffer())
5953 #ifdef CONFIG_ASH_OPTIMIZE_FOR_SIZE
5954 #define pgetc_macro() pgetc()
5958 return pgetc_as_macro();
5961 #define pgetc_macro() pgetc_as_macro()
5965 return pgetc_macro();
5971 * Same as pgetc(), but ignores PEOA.
5973 #ifdef CONFIG_ASH_ALIAS
5974 static int pgetc2(void)
5980 } while (c == PEOA);
5984 static inline int pgetc2(void)
5986 return pgetc_macro();
5991 * Read a line from the script.
5994 static inline char *
5995 pfgets(char *line, int len)
6001 while (--nleft > 0) {
6018 #ifdef CONFIG_FEATURE_COMMAND_EDITING
6019 static const char *cmdedit_prompt;
6020 static inline void putprompt(const char *s)
6025 static inline void putprompt(const char *s)
6035 char *buf = parsefile->buf;
6039 #ifdef CONFIG_FEATURE_COMMAND_EDITING
6040 if (!iflag || parsefile->fd)
6041 nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
6043 #ifdef CONFIG_FEATURE_COMMAND_TAB_COMPLETION
6044 cmdedit_path_lookup = pathval();
6046 nr = cmdedit_read_input((char *) cmdedit_prompt, buf);
6048 /* Ctrl+C presend */
6057 if(nr < 0 && errno == 0) {
6058 /* Ctrl+D presend */
6063 nr = safe_read(parsefile->fd, buf, BUFSIZ - 1);
6067 if (parsefile->fd == 0 && errno == EWOULDBLOCK) {
6068 int flags = fcntl(0, F_GETFL, 0);
6069 if (flags >= 0 && flags & O_NONBLOCK) {
6070 flags &=~ O_NONBLOCK;
6071 if (fcntl(0, F_SETFL, flags) >= 0) {
6072 out2str("sh: turning off NDELAY mode\n");
6082 * Refill the input buffer and return the next input character:
6084 * 1) If a string was pushed back on the input, pop it;
6085 * 2) If an EOF was pushed back (parsenleft == EOF_NLEFT) or we are reading
6086 * from a string so we can't refill the buffer, return EOF.
6087 * 3) If the is more stuff in this buffer, use it else call read to fill it.
6088 * 4) Process input up to the next newline, deleting nul characters.
6098 while (parsefile->strpush) {
6099 #ifdef CONFIG_ASH_ALIAS
6100 if (parsenleft == -1 && parsefile->strpush->ap &&
6101 parsenextc[-1] != ' ' && parsenextc[-1] != '\t') {
6106 if (--parsenleft >= 0)
6107 return (*parsenextc++);
6109 if (parsenleft == EOF_NLEFT || parsefile->buf == NULL)
6114 if (parselleft <= 0) {
6115 if ((parselleft = preadfd()) <= 0) {
6116 parselleft = parsenleft = EOF_NLEFT;
6123 /* delete nul characters */
6124 for (more = 1; more;) {
6131 parsenleft = q - parsenextc;
6132 more = 0; /* Stop processing here */
6139 if (--parselleft <= 0 && more) {
6140 parsenleft = q - parsenextc - 1;
6151 out2str(parsenextc);
6156 return *parsenextc++;
6160 * Undo the last call to pgetc. Only one character may be pushed back.
6161 * PEOF may be pushed back.
6172 * Push a string back onto the input at this current parsefile level.
6173 * We handle aliases this way.
6176 pushstring(char *s, void *ap)
6183 /*dprintf("*** calling pushstring: %s, %d\n", s, len);*/
6184 if (parsefile->strpush) {
6185 sp = ckmalloc(sizeof (struct strpush));
6186 sp->prev = parsefile->strpush;
6187 parsefile->strpush = sp;
6189 sp = parsefile->strpush = &(parsefile->basestrpush);
6190 sp->prevstring = parsenextc;
6191 sp->prevnleft = parsenleft;
6192 #ifdef CONFIG_ASH_ALIAS
6193 sp->ap = (struct alias *)ap;
6195 ((struct alias *)ap)->flag |= ALIASINUSE;
6207 struct strpush *sp = parsefile->strpush;
6210 #ifdef CONFIG_ASH_ALIAS
6212 if (parsenextc[-1] == ' ' || parsenextc[-1] == '\t') {
6213 checkkwd |= CHKALIAS;
6215 if (sp->string != sp->ap->val) {
6218 sp->ap->flag &= ~ALIASINUSE;
6219 if (sp->ap->flag & ALIASDEAD) {
6220 unalias(sp->ap->name);
6224 parsenextc = sp->prevstring;
6225 parsenleft = sp->prevnleft;
6226 /*dprintf("*** calling popstring: restoring to '%s'\n", parsenextc);*/
6227 parsefile->strpush = sp->prev;
6228 if (sp != &(parsefile->basestrpush))
6234 * Set the input to take input from a file. If push is set, push the
6235 * old input onto the stack first.
6239 setinputfile(const char *fname, int push)
6245 if ((fd = open(fname, O_RDONLY)) < 0)
6246 error("Can't open %s", fname);
6248 fd2 = copyfd(fd, 10);
6251 error("Out of file descriptors");
6254 setinputfd(fd, push);
6260 * Like setinputfile, but takes an open file descriptor. Call this with
6265 setinputfd(int fd, int push)
6267 (void) fcntl(fd, F_SETFD, FD_CLOEXEC);
6273 if (parsefile->buf == NULL)
6274 parsefile->buf = ckmalloc(IBUFSIZ);
6275 parselleft = parsenleft = 0;
6281 * Like setinputfile, but takes input from a string.
6285 setinputstring(char *string)
6289 parsenextc = string;
6290 parsenleft = strlen(string);
6291 parsefile->buf = NULL;
6298 * To handle the "." command, a stack of input files is used. Pushfile
6299 * adds a new entry to the stack and popfile restores the previous level.
6305 struct parsefile *pf;
6307 parsefile->nleft = parsenleft;
6308 parsefile->lleft = parselleft;
6309 parsefile->nextc = parsenextc;
6310 parsefile->linno = plinno;
6311 pf = (struct parsefile *)ckmalloc(sizeof (struct parsefile));
6312 pf->prev = parsefile;
6315 pf->basestrpush.prev = NULL;
6323 struct parsefile *pf = parsefile;
6332 parsefile = pf->prev;
6334 parsenleft = parsefile->nleft;
6335 parselleft = parsefile->lleft;
6336 parsenextc = parsefile->nextc;
6337 plinno = parsefile->linno;
6343 * Return to top level.
6349 while (parsefile != &basepf)
6355 * Close the file(s) that the shell is reading commands from. Called
6356 * after a fork is done.
6363 if (parsefile->fd > 0) {
6364 close(parsefile->fd);
6369 /* $NetBSD: jobs.c,v 1.56 2002/11/25 12:13:03 agc Exp $ */
6371 /* mode flags for set_curjob */
6372 #define CUR_DELETE 2
6373 #define CUR_RUNNING 1
6374 #define CUR_STOPPED 0
6376 /* mode flags for dowait */
6377 #define DOWAIT_NORMAL 0
6378 #define DOWAIT_BLOCK 1
6381 static struct job *jobtab;
6383 static unsigned njobs;
6385 /* pgrp of shell on invocation */
6386 static int initialpgrp;
6387 static int ttyfd = -1;
6390 static struct job *curjob;
6391 /* number of presumed living untracked jobs */
6394 static void set_curjob(struct job *, unsigned);
6396 static int restartjob(struct job *, int);
6397 static void xtcsetpgrp(int, pid_t);
6398 static char *commandtext(union node *);
6399 static void cmdlist(union node *, int);
6400 static void cmdtxt(union node *);
6401 static void cmdputs(const char *);
6402 static void showpipe(struct job *, FILE *);
6404 static int sprint_status(char *, int, int);
6405 static void freejob(struct job *);
6406 static struct job *getjob(const char *, int);
6407 static struct job *growjobtab(void);
6408 static void forkchild(struct job *, union node *, int);
6409 static void forkparent(struct job *, union node *, int, pid_t);
6410 static int dowait(int, struct job *);
6411 static int getstatus(struct job *);
6414 set_curjob(struct job *jp, unsigned mode)
6417 struct job **jpp, **curp;
6419 /* first remove from list */
6420 jpp = curp = &curjob;
6425 jpp = &jp1->prev_job;
6427 *jpp = jp1->prev_job;
6429 /* Then re-insert in correct position */
6437 /* job being deleted */
6440 /* newly created job or backgrounded job,
6441 put after all stopped jobs. */
6445 if (!jp1 || jp1->state != JOBSTOPPED)
6448 jpp = &jp1->prev_job;
6454 /* newly stopped job - becomes curjob */
6455 jp->prev_job = *jpp;
6463 * Turn job control on and off.
6465 * Note: This code assumes that the third arg to ioctl is a character
6466 * pointer, which is true on Berkeley systems but not System V. Since
6467 * System V doesn't have job control yet, this isn't a problem now.
6469 * Called with interrupts off.
6478 if (on == jobctl || rootshell == 0)
6482 ofd = fd = open(_PATH_TTY, O_RDWR);
6485 while (!isatty(fd) && --fd >= 0)
6488 fd = fcntl(fd, F_DUPFD, 10);
6492 fcntl(fd, F_SETFD, FD_CLOEXEC);
6493 do { /* while we are in the background */
6494 if ((pgrp = tcgetpgrp(fd)) < 0) {
6496 sh_warnx("can't access tty; job control turned off");
6500 if (pgrp == getpgrp())
6511 xtcsetpgrp(fd, pgrp);
6513 /* turning job control off */
6516 xtcsetpgrp(fd, pgrp);
6530 killcmd(int argc, char **argv)
6541 "Usage: kill [-s sigspec | -signum | -sigspec] [pid | job]... or\n"
6542 "kill -l [exitstatus]"
6546 if (**++argv == '-') {
6547 signo = decode_signal(*argv + 1, 1);
6551 while ((c = nextopt("ls:")) != '\0')
6561 signo = decode_signal(optionarg, 1);
6564 "invalid signal number or name: %s",
6575 if (!list && signo < 0)
6578 if ((signo < 0 || !*argv) ^ list) {
6586 for (i = 1; i < NSIG; i++) {
6587 name = u_signal_names(0, &i, 1);
6589 out1fmt(snlfmt, name);
6593 name = u_signal_names(*argptr, &signo, -1);
6595 out1fmt(snlfmt, name);
6597 error("invalid signal number or exit status: %s", *argptr);
6603 if (**argv == '%') {
6604 jp = getjob(*argv, 0);
6605 pid = -jp->ps[0].pid;
6607 pid = **argv == '-' ?
6608 -number(*argv + 1) : number(*argv);
6610 if (kill(pid, signo) != 0) {
6611 sh_warnx("(%d) - %m", pid);
6620 #if defined(JOBS) || defined(DEBUG)
6622 jobno(const struct job *jp)
6624 return jp - jobtab + 1;
6630 fgcmd(int argc, char **argv)
6637 mode = (**argv == 'f') ? FORK_FG : FORK_BG;
6642 jp = getjob(*argv, 1);
6643 if (mode == FORK_BG) {
6644 set_curjob(jp, CUR_RUNNING);
6645 fprintf(out, "[%d] ", jobno(jp));
6647 outstr(jp->ps->cmd, out);
6649 retval = restartjob(jp, mode);
6650 } while (*argv && *++argv);
6654 static int bgcmd(int, char **) __attribute__((__alias__("fgcmd")));
6658 restartjob(struct job *jp, int mode)
6660 struct procstat *ps;
6666 if (jp->state == JOBDONE)
6668 jp->state = JOBRUNNING;
6670 if (mode == FORK_FG)
6671 xtcsetpgrp(ttyfd, pgid);
6672 killpg(pgid, SIGCONT);
6676 if (WIFSTOPPED(ps->status)) {
6679 } while (ps++, --i);
6681 status = (mode == FORK_FG) ? waitforjob(jp) : 0;
6688 sprint_status(char *s, int status, int sigonly)
6694 if (!WIFEXITED(status)) {
6696 if (WIFSTOPPED(status))
6697 st = WSTOPSIG(status);
6700 st = WTERMSIG(status);
6702 if (st == SIGINT || st == SIGPIPE)
6705 if (WIFSTOPPED(status))
6710 col = fmtstr(s, 32, strsignal(st));
6711 if (WCOREDUMP(status)) {
6712 col += fmtstr(s + col, 16, " (core dumped)");
6714 } else if (!sigonly) {
6715 st = WEXITSTATUS(status);
6717 col = fmtstr(s, 16, "Done(%d)", st);
6719 col = fmtstr(s, 16, "Done");
6728 showjob(FILE *out, struct job *jp, int mode)
6730 struct procstat *ps;
6731 struct procstat *psend;
6738 if (mode & SHOW_PGID) {
6739 /* just output process (group) id of pipeline */
6740 fprintf(out, "%d\n", ps->pid);
6744 col = fmtstr(s, 16, "[%d] ", jobno(jp));
6749 else if (curjob && jp == curjob->prev_job)
6752 if (mode & SHOW_PID)
6753 col += fmtstr(s + col, 16, "%d ", ps->pid);
6755 psend = ps + jp->nprocs;
6757 if (jp->state == JOBRUNNING) {
6758 scopy("Running", s + col);
6759 col += strlen("Running");
6761 int status = psend[-1].status;
6763 if (jp->state == JOBSTOPPED)
6764 status = jp->stopstatus;
6766 col += sprint_status(s + col, status, 0);
6772 /* for each process */
6773 col = fmtstr(s, 48, " |\n%*c%d ", indent, ' ', ps->pid) - 3;
6776 fprintf(out, "%s%*c%s",
6777 s, 33 - col >= 0 ? 33 - col : 0, ' ', ps->cmd
6779 if (!(mode & SHOW_PID)) {
6783 if (++ps == psend) {
6784 outcslow('\n', out);
6791 if (jp->state == JOBDONE) {
6792 TRACE(("showjob: freeing job %d\n", jobno(jp)));
6799 jobscmd(int argc, char **argv)
6805 while ((m = nextopt("lp")))
6815 showjob(out, getjob(*argv,0), mode);
6818 showjobs(out, mode);
6825 * Print a list of jobs. If "change" is nonzero, only print jobs whose
6826 * statuses have changed since the last call to showjobs.
6830 showjobs(FILE *out, int mode)
6834 TRACE(("showjobs(%x) called\n", mode));
6836 /* If not even one one job changed, there is nothing to do */
6837 while (dowait(DOWAIT_NORMAL, NULL) > 0)
6840 for (jp = curjob; jp; jp = jp->prev_job) {
6841 if (!(mode & SHOW_CHANGED) || jp->changed)
6842 showjob(out, jp, mode);
6848 * Mark a job structure as unused.
6852 freejob(struct job *jp)
6854 struct procstat *ps;
6858 for (i = jp->nprocs, ps = jp->ps ; --i >= 0 ; ps++) {
6859 if (ps->cmd != nullstr)
6862 if (jp->ps != &jp->ps0)
6865 set_curjob(jp, CUR_DELETE);
6871 waitcmd(int argc, char **argv)
6884 /* wait for all jobs */
6889 /* no running procs */
6892 if (jp->state == JOBRUNNING)
6897 dowait(DOWAIT_BLOCK, 0);
6903 if (**argv != '%') {
6904 pid_t pid = number(*argv);
6908 if (job->ps[job->nprocs - 1].pid == pid)
6910 job = job->prev_job;
6916 job = getjob(*argv, 0);
6917 /* loop until process terminated or stopped */
6918 while (job->state == JOBRUNNING)
6919 dowait(DOWAIT_BLOCK, 0);
6921 retval = getstatus(job);
6932 * Convert a job name to a job structure.
6936 getjob(const char *name, int getctl)
6940 const char *err_msg = "No such job: %s";
6944 char *(*match)(const char *, const char *);
6959 if (c == '+' || c == '%') {
6961 err_msg = "No current job";
6963 } else if (c == '-') {
6966 err_msg = "No previous job";
6977 jp = jobtab + num - 1;
6994 if (match(jp->ps[0].cmd, p)) {
6998 err_msg = "%s: ambiguous";
7005 err_msg = "job %s not created under job control";
7006 if (getctl && jp->jobctl == 0)
7011 error(err_msg, name);
7016 * Return a new job structure.
7017 * Called with interrupts off.
7021 makejob(union node *node, int nprocs)
7026 for (i = njobs, jp = jobtab ; ; jp++) {
7033 if (jp->state != JOBDONE || !jp->waited)
7042 memset(jp, 0, sizeof(*jp));
7047 jp->prev_job = curjob;
7052 jp->ps = ckmalloc(nprocs * sizeof (struct procstat));
7054 TRACE(("makejob(0x%lx, %d) returns %%%d\n", (long)node, nprocs,
7064 struct job *jp, *jq;
7066 len = njobs * sizeof(*jp);
7068 jp = ckrealloc(jq, len + 4 * sizeof(*jp));
7070 offset = (char *)jp - (char *)jq;
7072 /* Relocate pointers */
7075 jq = (struct job *)((char *)jq + l);
7079 #define joff(p) ((struct job *)((char *)(p) + l))
7080 #define jmove(p) (p) = (void *)((char *)(p) + offset)
7081 if (xlikely(joff(jp)->ps == &jq->ps0))
7082 jmove(joff(jp)->ps);
7083 if (joff(jp)->prev_job)
7084 jmove(joff(jp)->prev_job);
7094 jp = (struct job *)((char *)jp + len);
7098 } while (--jq >= jp);
7104 * Fork off a subshell. If we are doing job control, give the subshell its
7105 * own process group. Jp is a job structure that the job is to be added to.
7106 * N is the command that will be evaluated by the child. Both jp and n may
7107 * be NULL. The mode parameter can be one of the following:
7108 * FORK_FG - Fork off a foreground process.
7109 * FORK_BG - Fork off a background process.
7110 * FORK_NOJOB - Like FORK_FG, but don't give the process its own
7111 * process group even if job control is on.
7113 * When job control is turned off, background processes have their standard
7114 * input redirected to /dev/null (except for the second and later processes
7117 * Called with interrupts off.
7121 forkchild(struct job *jp, union node *n, int mode)
7125 TRACE(("Child shell %d\n", getpid()));
7126 wasroot = rootshell;
7132 /* do job control only in root shell */
7134 if (mode != FORK_NOJOB && jp->jobctl && wasroot) {
7137 if (jp->nprocs == 0)
7140 pgrp = jp->ps[0].pid;
7141 /* This can fail because we are doing it in the parent also */
7142 (void)setpgid(0, pgrp);
7143 if (mode == FORK_FG)
7144 xtcsetpgrp(ttyfd, pgrp);
7149 if (mode == FORK_BG) {
7152 if (jp->nprocs == 0) {
7154 if (open(_PATH_DEVNULL, O_RDONLY) != 0)
7155 error("Can't open %s", _PATH_DEVNULL);
7158 if (wasroot && iflag) {
7163 for (jp = curjob; jp; jp = jp->prev_job)
7169 forkparent(struct job *jp, union node *n, int mode, pid_t pid)
7171 TRACE(("In parent shell: child = %d\n", pid));
7173 while (jobless && dowait(DOWAIT_NORMAL, 0) > 0);
7178 if (mode != FORK_NOJOB && jp->jobctl) {
7181 if (jp->nprocs == 0)
7184 pgrp = jp->ps[0].pid;
7185 /* This can fail because we are doing it in the child also */
7186 (void)setpgid(pid, pgrp);
7189 if (mode == FORK_BG) {
7190 backgndpid = pid; /* set $! */
7191 set_curjob(jp, CUR_RUNNING);
7194 struct procstat *ps = &jp->ps[jp->nprocs++];
7200 ps->cmd = commandtext(n);
7206 forkshell(struct job *jp, union node *n, int mode)
7210 TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode));
7213 TRACE(("Fork failed, errno=%d", errno));
7216 error("Cannot fork");
7219 forkchild(jp, n, mode);
7221 forkparent(jp, n, mode, pid);
7226 * Wait for job to finish.
7228 * Under job control we have the problem that while a child process is
7229 * running interrupts generated by the user are sent to the child but not
7230 * to the shell. This means that an infinite loop started by an inter-
7231 * active user may be hard to kill. With job control turned off, an
7232 * interactive user may place an interactive program inside a loop. If
7233 * the interactive program catches interrupts, the user doesn't want
7234 * these interrupts to also abort the loop. The approach we take here
7235 * is to have the shell ignore interrupt signals while waiting for a
7236 * foreground process to terminate, and then send itself an interrupt
7237 * signal if the child process was terminated by an interrupt signal.
7238 * Unfortunately, some programs want to do a bit of cleanup and then
7239 * exit on interrupt; unless these processes terminate themselves by
7240 * sending a signal to themselves (instead of calling exit) they will
7241 * confuse this approach.
7243 * Called with interrupts off.
7247 waitforjob(struct job *jp)
7251 TRACE(("waitforjob(%%%d) called\n", jobno(jp)));
7252 while (jp->state == JOBRUNNING) {
7253 dowait(DOWAIT_BLOCK, jp);
7258 xtcsetpgrp(ttyfd, rootpid);
7260 * This is truly gross.
7261 * If we're doing job control, then we did a TIOCSPGRP which
7262 * caused us (the shell) to no longer be in the controlling
7263 * session -- so we wouldn't have seen any ^C/SIGINT. So, we
7264 * intuit from the subprocess exit status whether a SIGINT
7265 * occurred, and if so interrupt ourselves. Yuck. - mycroft
7270 if (jp->state == JOBDONE)
7278 * Do a wait system call. If job control is compiled in, we accept
7279 * stopped processes. If block is zero, we return a value of zero
7280 * rather than blocking.
7282 * System V doesn't have a non-blocking wait system call. It does
7283 * have a SIGCLD signal that is sent to a process when one of it's
7284 * children dies. The obvious way to use SIGCLD would be to install
7285 * a handler for SIGCLD which simply bumped a counter when a SIGCLD
7286 * was received, and have waitproc bump another counter when it got
7287 * the status of a process. Waitproc would then know that a wait
7288 * system call would not block if the two counters were different.
7289 * This approach doesn't work because if a process has children that
7290 * have not been waited for, System V will send it a SIGCLD when it
7291 * installs a signal handler for SIGCLD. What this means is that when
7292 * a child exits, the shell will be sent SIGCLD signals continuously
7293 * until is runs out of stack space, unless it does a wait call before
7294 * restoring the signal handler. The code below takes advantage of
7295 * this (mis)feature by installing a signal handler for SIGCLD and
7296 * then checking to see whether it was called. If there are any
7297 * children to be waited for, it will be.
7299 * If neither SYSV nor BSD is defined, we don't implement nonblocking
7300 * waits at all. In this case, the user will not be informed when
7301 * a background process until the next time she runs a real program
7302 * (as opposed to running a builtin command or just typing return),
7303 * and the jobs command may give out of date information.
7307 waitproc(int block, int *status)
7317 return wait3(status, flags, (struct rusage *)NULL);
7321 * Wait for a process to terminate.
7325 dowait(int block, struct job *job)
7330 struct job *thisjob;
7333 TRACE(("dowait(%d) called\n", block));
7334 pid = waitproc(block, &status);
7335 TRACE(("wait returns pid %d, status=%d\n", pid, status));
7340 for (jp = curjob; jp; jp = jp->prev_job) {
7341 struct procstat *sp;
7342 struct procstat *spend;
7343 if (jp->state == JOBDONE)
7346 spend = jp->ps + jp->nprocs;
7349 if (sp->pid == pid) {
7350 TRACE(("Job %d: changing status of proc %d from 0x%x to 0x%x\n", jobno(jp), pid, sp->status, status));
7351 sp->status = status;
7354 if (sp->status == -1)
7357 if (state == JOBRUNNING)
7359 if (WIFSTOPPED(sp->status)) {
7360 jp->stopstatus = sp->status;
7364 } while (++sp < spend);
7369 if (!WIFSTOPPED(status))
7376 if (state != JOBRUNNING) {
7377 thisjob->changed = 1;
7379 if (thisjob->state != state) {
7380 TRACE(("Job %d: changing state from %d to %d\n", jobno(thisjob), thisjob->state, state));
7381 thisjob->state = state;
7383 if (state == JOBSTOPPED) {
7384 set_curjob(thisjob, CUR_STOPPED);
7393 if (thisjob && thisjob == job) {
7397 len = sprint_status(s, status, 1);
7409 * return 1 if there are stopped jobs, otherwise 0
7422 if (jp && jp->state == JOBSTOPPED) {
7423 out2str("You have stopped jobs.\n");
7433 * Return a string identifying a command (to be printed by the
7438 static char *cmdnextc;
7441 commandtext(union node *n)
7445 STARTSTACKSTR(cmdnextc);
7447 name = stackblock();
7448 TRACE(("commandtext: name %p, end %p\n\t\"%s\"\n",
7449 name, cmdnextc, cmdnextc));
7450 return savestr(name);
7454 cmdtxt(union node *n)
7457 struct nodelist *lp;
7469 lp = n->npipe.cmdlist;
7487 cmdtxt(n->nbinary.ch1);
7503 cmdtxt(n->nif.test);
7506 if (n->nif.elsepart) {
7509 n = n->nif.elsepart;
7525 cmdtxt(n->nbinary.ch1);
7535 cmdputs(n->nfor.var);
7537 cmdlist(n->nfor.args, 1);
7542 cmdputs(n->narg.text);
7546 cmdlist(n->ncmd.args, 1);
7547 cmdlist(n->ncmd.redirect, 0);
7560 cmdputs(n->ncase.expr->narg.text);
7562 for (np = n->ncase.cases; np; np = np->nclist.next) {
7563 cmdtxt(np->nclist.pattern);
7565 cmdtxt(np->nclist.body);
7591 s[0] = n->nfile.fd + '0';
7595 if (n->type == NTOFD || n->type == NFROMFD) {
7596 s[0] = n->ndup.dupfd + '0';
7607 cmdlist(union node *np, int sep)
7609 for (; np; np = np->narg.next) {
7613 if (sep && np->narg.next)
7619 cmdputs(const char *s)
7621 const char *p, *str;
7622 char c, cc[2] = " ";
7626 static const char vstype[VSTYPE + 1][4] = {
7627 "", "}", "-", "+", "?", "=",
7628 "%", "%%", "#", "##"
7630 nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc);
7632 while ((c = *p++) != 0) {
7640 if ((subtype & VSTYPE) == VSLENGTH)
7644 if (!(subtype & VSQUOTE) != !(quoted & 1)) {
7651 str = "\"}" + !(quoted & 1);
7658 case CTLBACKQ+CTLQUOTE:
7661 #ifdef CONFIG_ASH_MATH_SUPPORT
7676 if ((subtype & VSTYPE) != VSNORMAL)
7678 str = vstype[subtype & VSTYPE];
7679 if (subtype & VSNUL)
7688 /* These can only happen inside quotes */
7701 while ((c = *str++)) {
7706 USTPUTC('"', nextc);
7714 showpipe(struct job *jp, FILE *out)
7716 struct procstat *sp;
7717 struct procstat *spend;
7719 spend = jp->ps + jp->nprocs;
7720 for (sp = jp->ps + 1; sp < spend; sp++)
7721 fprintf(out, " | %s", sp->cmd);
7722 outcslow('\n', out);
7727 xtcsetpgrp(int fd, pid_t pgrp)
7729 if (tcsetpgrp(fd, pgrp))
7730 error("Cannot set tty process group (%m)");
7735 getstatus(struct job *job) {
7739 status = job->ps[job->nprocs - 1].status;
7740 retval = WEXITSTATUS(status);
7741 if (!WIFEXITED(status)) {
7743 retval = WSTOPSIG(status);
7744 if (!WIFSTOPPED(status))
7747 /* XXX: limits number of signals */
7748 retval = WTERMSIG(status);
7750 if (retval == SIGINT)
7756 TRACE(("getstatus: job %d, nproc %d, status %x, retval %x\n",
7757 jobno(job), job->nprocs, status, retval));
7761 #ifdef CONFIG_ASH_MAIL
7762 /* $NetBSD: mail.c,v 1.15 2002/11/24 22:35:40 christos Exp $ */
7765 * Routines to check for mail. (Perhaps make part of main.c?)
7768 #define MAXMBOXES 10
7770 /* times of mailboxes */
7771 static time_t mailtime[MAXMBOXES];
7772 /* Set if MAIL or MAILPATH is changed. */
7773 static int mail_var_path_changed;
7778 * Print appropriate message(s) if mail has arrived.
7779 * If mail_var_path_changed is set,
7780 * then the value of MAIL has mail_var_path_changed,
7781 * so we just update the values.
7791 struct stackmark smark;
7794 setstackmark(&smark);
7795 mpath = mpathset() ? mpathval() : mailval();
7796 for (mtp = mailtime; mtp < mailtime + MAXMBOXES; mtp++) {
7797 p = padvance(&mpath, nullstr);
7802 for (q = p ; *q ; q++);
7807 q[-1] = '\0'; /* delete trailing '/' */
7808 if (stat(p, &statb) < 0) {
7812 if (!mail_var_path_changed && statb.st_mtime != *mtp) {
7815 pathopt ? pathopt : "you have mail"
7818 *mtp = statb.st_mtime;
7820 mail_var_path_changed = 0;
7821 popstackmark(&smark);
7826 changemail(const char *val)
7828 mail_var_path_changed++;
7831 #endif /* CONFIG_ASH_MAIL */
7833 /* $NetBSD: main.c,v 1.46 2002/12/11 19:12:18 christos Exp $ */
7837 static short profile_buf[16384];
7841 static int isloginsh;
7843 static void read_profile(const char *);
7846 * Main routine. We initialize things, parse the arguments, execute
7847 * profiles if we're a login shell, and then call cmdloop to execute
7848 * commands. The setjmp call sets up the location to jump to when an
7849 * exception occurs. When an exception occurs the variable "state"
7850 * is used to figure out how far we had gotten.
7854 ash_main(int argc, char **argv)
7858 struct jmploc jmploc;
7859 struct stackmark smark;
7862 dash_errno = __errno_location();
7866 monitor(4, etext, profile_buf, sizeof profile_buf, 50);
7869 if (setjmp(jmploc.loc)) {
7876 switch (exception) {
7886 status = exitstatus;
7889 exitstatus = status;
7891 if (e == EXEXIT || state == 0 || iflag == 0 || ! rootshell)
7895 outcslow('\n', stderr);
7897 popstackmark(&smark);
7898 FORCEINTON; /* enable interrupts */
7901 else if (state == 2)
7903 else if (state == 3)
7911 trputs("Shell args: "); trargs(argv);
7915 #ifdef CONFIG_ASH_RANDOM_SUPPORT
7916 rseed = rootpid + ((time_t)time((time_t *)0));
7920 setstackmark(&smark);
7921 procargs(argc, argv);
7922 #ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
7924 const char *hp = lookupvar("HISTFILE");
7927 hp = lookupvar("HOME");
7929 char *defhp = concat_path_file(hp, ".ash_history");
7930 setvar("HISTFILE", defhp, 0);
7936 if (argv[0] && argv[0][0] == '-')
7940 read_profile("/etc/profile");
7943 read_profile(".profile");
7949 getuid() == geteuid() && getgid() == getegid() &&
7953 if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
7954 read_profile(shinit);
7962 if (sflag || minusc == NULL) {
7963 #ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
7965 const char *hp = lookupvar("HISTFILE");
7968 load_history ( hp );
7971 state4: /* XXX ??? - why isn't this before the "if" statement */
7979 extern void _mcleanup(void);
7989 * Read and execute commands. "Top" is nonzero for the top level command
7990 * loop; it turns on prompting if the shell is interactive.
7997 struct stackmark smark;
8001 TRACE(("cmdloop(%d) called\n", top));
8003 setstackmark(&smark);
8008 showjobs(stderr, SHOW_CHANGED);
8013 #ifdef CONFIG_ASH_MAIL
8017 n = parsecmd(inter);
8018 /* showtree(n); DEBUG */
8020 if (!top || numeof >= 50)
8022 if (!stoppedjobs()) {
8025 out2str("\nUse \"exit\" to leave shell.\n");
8028 } else if (n != NULL && nflag == 0) {
8029 job_warning = (job_warning == 2) ? 1 : 0;
8033 popstackmark(&smark);
8043 * Read /etc/profile or .profile. Return on error.
8047 read_profile(const char *name)
8054 if ((fd = open(name, O_RDONLY)) >= 0)
8059 /* -q turns off -x and -v just when executing init files */
8062 xflag = 0, xflag_set = 1;
8064 vflag = 0, vflag_set = 1;
8078 * Read a file containing shell functions.
8082 readcmdfile(char *name)
8087 if ((fd = open(name, O_RDONLY)) >= 0)
8090 error("Can't open %s", name);
8098 * Take commands from a file. To be compatible we should do a path
8099 * search for the file, which is necessary to find sub-commands.
8102 static inline char *
8103 find_dot_file(char *name)
8106 const char *path = pathval();
8109 /* don't try this for absolute or relative paths */
8110 if (strchr(name, '/'))
8113 while ((fullname = padvance(&path, name)) != NULL) {
8114 if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
8116 * Don't bother freeing here, since it will
8117 * be freed by the caller.
8121 stunalloc(fullname);
8124 /* not found in the PATH */
8125 error(not_found_msg, name);
8129 static int dotcmd(int argc, char **argv)
8132 volatile struct shparam saveparam;
8136 for (sp = cmdenviron; sp; sp = sp->next)
8137 setvareq(bb_xstrdup(sp->text), VSTRFIXED | VTEXTFIXED);
8139 if (argc >= 2) { /* That's what SVR2 does */
8141 struct stackmark smark;
8143 setstackmark(&smark);
8144 fullname = find_dot_file(argv[1]);
8147 saveparam = shellparam;
8148 shellparam.malloc = 0;
8149 shellparam.nparam = argc - 2;
8150 shellparam.p = argv + 2;
8153 setinputfile(fullname, 1);
8154 commandname = fullname;
8159 freeparam(&shellparam);
8160 shellparam = saveparam;
8163 popstackmark(&smark);
8170 exitcmd(int argc, char **argv)
8175 exitstatus = number(argv[1]);
8180 #ifdef CONFIG_ASH_BUILTIN_ECHO
8182 echocmd(int argc, char **argv)
8184 return bb_echo(argc, argv);
8187 /* $NetBSD: memalloc.c,v 1.27 2003/01/22 20:36:04 dsl Exp $ */
8190 * Same for malloc, realloc, but returns an error when out of space.
8194 ckrealloc(pointer p, size_t nbytes)
8196 p = realloc(p, nbytes);
8198 error(bb_msg_memory_exhausted);
8203 ckmalloc(size_t nbytes)
8205 return ckrealloc(NULL, nbytes);
8209 * Make a copy of a string in safe storage.
8213 savestr(const char *s)
8215 char *p = strdup(s);
8217 error(bb_msg_memory_exhausted);
8223 * Parse trees for commands are allocated in lifo order, so we use a stack
8224 * to make this more efficient, and also to avoid all sorts of exception
8225 * handling code to handle interrupts in the middle of a parse.
8227 * The size 504 was chosen because the Ultrix malloc handles that size
8233 stalloc(size_t nbytes)
8238 aligned = SHELL_ALIGN(nbytes);
8239 if (aligned > stacknleft) {
8242 struct stack_block *sp;
8244 blocksize = aligned;
8245 if (blocksize < MINSIZE)
8246 blocksize = MINSIZE;
8247 len = sizeof(struct stack_block) - MINSIZE + blocksize;
8248 if (len < blocksize)
8249 error(bb_msg_memory_exhausted);
8253 stacknxt = sp->space;
8254 stacknleft = blocksize;
8255 sstrend = stacknxt + blocksize;
8260 stacknxt += aligned;
8261 stacknleft -= aligned;
8267 stunalloc(pointer p)
8270 if (!p || (stacknxt < (char *)p) || ((char *)p < stackp->space)) {
8271 write(2, "stunalloc\n", 10);
8275 stacknleft += stacknxt - (char *)p;
8281 setstackmark(struct stackmark *mark)
8283 mark->stackp = stackp;
8284 mark->stacknxt = stacknxt;
8285 mark->stacknleft = stacknleft;
8286 mark->marknext = markp;
8292 popstackmark(struct stackmark *mark)
8294 struct stack_block *sp;
8297 markp = mark->marknext;
8298 while (stackp != mark->stackp) {
8303 stacknxt = mark->stacknxt;
8304 stacknleft = mark->stacknleft;
8305 sstrend = mark->stacknxt + mark->stacknleft;
8311 * When the parser reads in a string, it wants to stick the string on the
8312 * stack and only adjust the stack pointer when it knows how big the
8313 * string is. Stackblock (defined in stack.h) returns a pointer to a block
8314 * of space on top of the stack and stackblocklen returns the length of
8315 * this block. Growstackblock will grow this space by at least one byte,
8316 * possibly moving it (like realloc). Grabstackblock actually allocates the
8317 * part of the block that has been used.
8321 growstackblock(void)
8325 newlen = stacknleft * 2;
8326 if (newlen < stacknleft)
8327 error(bb_msg_memory_exhausted);
8331 if (stacknxt == stackp->space && stackp != &stackbase) {
8332 struct stack_block *oldstackp;
8333 struct stackmark *xmark;
8334 struct stack_block *sp;
8335 struct stack_block *prevstackp;
8341 prevstackp = sp->prev;
8342 grosslen = newlen + sizeof(struct stack_block) - MINSIZE;
8343 sp = ckrealloc((pointer)sp, grosslen);
8344 sp->prev = prevstackp;
8346 stacknxt = sp->space;
8347 stacknleft = newlen;
8348 sstrend = sp->space + newlen;
8351 * Stack marks pointing to the start of the old block
8352 * must be relocated to point to the new block
8355 while (xmark != NULL && xmark->stackp == oldstackp) {
8356 xmark->stackp = stackp;
8357 xmark->stacknxt = stacknxt;
8358 xmark->stacknleft = stacknleft;
8359 xmark = xmark->marknext;
8363 char *oldspace = stacknxt;
8364 int oldlen = stacknleft;
8365 char *p = stalloc(newlen);
8367 /* free the space we just allocated */
8368 stacknxt = memcpy(p, oldspace, oldlen);
8369 stacknleft += newlen;
8374 grabstackblock(size_t len)
8376 len = SHELL_ALIGN(len);
8382 * The following routines are somewhat easier to use than the above.
8383 * The user declares a variable of type STACKSTR, which may be declared
8384 * to be a register. The macro STARTSTACKSTR initializes things. Then
8385 * the user uses the macro STPUTC to add characters to the string. In
8386 * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is
8387 * grown as necessary. When the user is done, she can just leave the
8388 * string there and refer to it using stackblock(). Or she can allocate
8389 * the space for it using grabstackstr(). If it is necessary to allow
8390 * someone else to use the stack temporarily and then continue to grow
8391 * the string, the user should use grabstack to allocate the space, and
8392 * then call ungrabstr(p) to return to the previous mode of operation.
8394 * USTPUTC is like STPUTC except that it doesn't check for overflow.
8395 * CHECKSTACKSPACE can be called before USTPUTC to ensure that there
8396 * is space for at least one character.
8402 size_t len = stackblocksize();
8403 if (herefd >= 0 && len >= 1024) {
8404 bb_full_write(herefd, stackblock(), len);
8405 return stackblock();
8408 return stackblock() + len;
8412 * Called from CHECKSTRSPACE.
8416 makestrspace(size_t newlen, char *p)
8418 size_t len = p - stacknxt;
8419 size_t size = stackblocksize();
8424 size = stackblocksize();
8426 if (nleft >= newlen)
8430 return stackblock() + len;
8434 stnputs(const char *s, size_t n, char *p)
8436 p = makestrspace(n, p);
8437 p = mempcpy(p, s, n);
8442 stputs(const char *s, char *p)
8444 return stnputs(s, strlen(s), p);
8447 /* $NetBSD: mystring.c,v 1.15 2002/11/24 22:35:42 christos Exp $ */
8452 * number(s) Convert a string of digits to an integer.
8453 * is_number(s) Return true if s is a string of digits.
8457 * prefix -- see if pfx is a prefix of string.
8461 prefix(const char *string, const char *pfx)
8464 if (*pfx++ != *string++)
8467 return (char *) string;
8472 * Convert a string of digits to an integer, printing an error message on
8477 number(const char *s)
8487 * Check for a valid number. This should be elsewhere.
8491 is_number(const char *p)
8496 } while (*++p != '\0');
8502 * Produce a possibly single quoted string suitable as input to the shell.
8503 * The return string is allocated on the stack.
8507 single_quote(const char *s) {
8516 len = strchrnul(s, '\'') - s;
8518 q = p = makestrspace(len + 3, p);
8521 q = mempcpy(q, s, len);
8527 len = strspn(s, "'");
8531 q = p = makestrspace(len + 3, p);
8534 q = mempcpy(q, s, len);
8543 return stackblock();
8547 * Like strdup but works with the ash stack.
8551 sstrdup(const char *p)
8553 size_t len = strlen(p) + 1;
8554 return memcpy(stalloc(len), p, len);
8559 calcsize(union node *n)
8563 funcblocksize += nodesize[n->type];
8566 calcsize(n->ncmd.redirect);
8567 calcsize(n->ncmd.args);
8568 calcsize(n->ncmd.assign);
8571 sizenodelist(n->npipe.cmdlist);
8576 calcsize(n->nredir.redirect);
8577 calcsize(n->nredir.n);
8584 calcsize(n->nbinary.ch2);
8585 calcsize(n->nbinary.ch1);
8588 calcsize(n->nif.elsepart);
8589 calcsize(n->nif.ifpart);
8590 calcsize(n->nif.test);
8593 funcstringsize += strlen(n->nfor.var) + 1;
8594 calcsize(n->nfor.body);
8595 calcsize(n->nfor.args);
8598 calcsize(n->ncase.cases);
8599 calcsize(n->ncase.expr);
8602 calcsize(n->nclist.body);
8603 calcsize(n->nclist.pattern);
8604 calcsize(n->nclist.next);
8608 sizenodelist(n->narg.backquote);
8609 funcstringsize += strlen(n->narg.text) + 1;
8610 calcsize(n->narg.next);
8617 calcsize(n->nfile.fname);
8618 calcsize(n->nfile.next);
8622 calcsize(n->ndup.vname);
8623 calcsize(n->ndup.next);
8627 calcsize(n->nhere.doc);
8628 calcsize(n->nhere.next);
8631 calcsize(n->nnot.com);
8638 sizenodelist(struct nodelist *lp)
8641 funcblocksize += SHELL_ALIGN(sizeof(struct nodelist));
8649 copynode(union node *n)
8656 funcblock = (char *) funcblock + nodesize[n->type];
8659 new->ncmd.redirect = copynode(n->ncmd.redirect);
8660 new->ncmd.args = copynode(n->ncmd.args);
8661 new->ncmd.assign = copynode(n->ncmd.assign);
8664 new->npipe.cmdlist = copynodelist(n->npipe.cmdlist);
8665 new->npipe.backgnd = n->npipe.backgnd;
8670 new->nredir.redirect = copynode(n->nredir.redirect);
8671 new->nredir.n = copynode(n->nredir.n);
8678 new->nbinary.ch2 = copynode(n->nbinary.ch2);
8679 new->nbinary.ch1 = copynode(n->nbinary.ch1);
8682 new->nif.elsepart = copynode(n->nif.elsepart);
8683 new->nif.ifpart = copynode(n->nif.ifpart);
8684 new->nif.test = copynode(n->nif.test);
8687 new->nfor.var = nodesavestr(n->nfor.var);
8688 new->nfor.body = copynode(n->nfor.body);
8689 new->nfor.args = copynode(n->nfor.args);
8692 new->ncase.cases = copynode(n->ncase.cases);
8693 new->ncase.expr = copynode(n->ncase.expr);
8696 new->nclist.body = copynode(n->nclist.body);
8697 new->nclist.pattern = copynode(n->nclist.pattern);
8698 new->nclist.next = copynode(n->nclist.next);
8702 new->narg.backquote = copynodelist(n->narg.backquote);
8703 new->narg.text = nodesavestr(n->narg.text);
8704 new->narg.next = copynode(n->narg.next);
8711 new->nfile.fname = copynode(n->nfile.fname);
8712 new->nfile.fd = n->nfile.fd;
8713 new->nfile.next = copynode(n->nfile.next);
8717 new->ndup.vname = copynode(n->ndup.vname);
8718 new->ndup.dupfd = n->ndup.dupfd;
8719 new->ndup.fd = n->ndup.fd;
8720 new->ndup.next = copynode(n->ndup.next);
8724 new->nhere.doc = copynode(n->nhere.doc);
8725 new->nhere.fd = n->nhere.fd;
8726 new->nhere.next = copynode(n->nhere.next);
8729 new->nnot.com = copynode(n->nnot.com);
8732 new->type = n->type;
8737 static struct nodelist *
8738 copynodelist(struct nodelist *lp)
8740 struct nodelist *start;
8741 struct nodelist **lpp;
8746 funcblock = (char *) funcblock +
8747 SHELL_ALIGN(sizeof(struct nodelist));
8748 (*lpp)->n = copynode(lp->n);
8750 lpp = &(*lpp)->next;
8758 nodesavestr(char *s)
8760 char *rtn = funcstring;
8762 funcstring = stpcpy(funcstring, s) + 1;
8768 * Free a parse tree.
8772 freefunc(struct funcnode *f)
8774 if (f && --f->count < 0)
8779 static void options(int);
8780 static void setoption(int, int);
8784 * Process the shell command line arguments.
8788 procargs(int argc, char **argv)
8791 const char *xminusc;
8798 for (i = 0; i < NOPTS; i++)
8804 if (*xargv == NULL) {
8806 error("-c requires an argument");
8809 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
8813 for (i = 0; i < NOPTS; i++)
8814 if (optlist[i] == 2)
8819 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
8824 } else if (!sflag) {
8825 setinputfile(*xargv, 0);
8831 shellparam.p = xargv;
8832 #ifdef CONFIG_ASH_GETOPTS
8833 shellparam.optind = 1;
8834 shellparam.optoff = -1;
8836 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
8838 shellparam.nparam++;
8851 setinteractive(iflag);
8857 minus_o(char *name, int val)
8862 out1str("Current option settings\n");
8863 for (i = 0; i < NOPTS; i++)
8864 out1fmt("%-16s%s\n", optnames(i),
8865 optlist[i] ? "on" : "off");
8867 for (i = 0; i < NOPTS; i++)
8868 if (equal(name, optnames(i))) {
8872 error("Illegal option -o %s", name);
8877 * Process shell options. The global variable argptr contains a pointer
8878 * to the argument list; we advance it past the options.
8882 options(int cmdline)
8890 while ((p = *argptr) != NULL) {
8892 if ((c = *p++) == '-') {
8894 if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
8896 /* "-" means turn off -x and -v */
8899 /* "--" means reset params */
8900 else if (*argptr == NULL)
8903 break; /* "-" or "--" terminates options */
8905 } else if (c == '+') {
8911 while ((c = *p++) != '\0') {
8912 if (c == 'c' && cmdline) {
8913 minusc = p; /* command is after shell args*/
8914 } else if (c == 'o') {
8915 minus_o(*argptr, val);
8918 } else if (cmdline && (c == '-')) { // long options
8919 if (strcmp(p, "login") == 0)
8931 setoption(int flag, int val)
8935 for (i = 0; i < NOPTS; i++)
8936 if (optletters(i) == flag) {
8940 error("Illegal option -%c", flag);
8947 * Set the shell parameters.
8951 setparam(char **argv)
8957 for (nparam = 0 ; argv[nparam] ; nparam++);
8958 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
8960 *ap++ = savestr(*argv++);
8963 freeparam(&shellparam);
8964 shellparam.malloc = 1;
8965 shellparam.nparam = nparam;
8966 shellparam.p = newparam;
8967 #ifdef CONFIG_ASH_GETOPTS
8968 shellparam.optind = 1;
8969 shellparam.optoff = -1;
8975 * Free the list of positional parameters.
8979 freeparam(volatile struct shparam *param)
8983 if (param->malloc) {
8984 for (ap = param->p ; *ap ; ap++)
8993 * The shift builtin command.
8997 shiftcmd(int argc, char **argv)
9004 n = number(argv[1]);
9005 if (n > shellparam.nparam)
9006 error("can't shift that many");
9008 shellparam.nparam -= n;
9009 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
9010 if (shellparam.malloc)
9014 while ((*ap2++ = *ap1++) != NULL);
9015 #ifdef CONFIG_ASH_GETOPTS
9016 shellparam.optind = 1;
9017 shellparam.optoff = -1;
9026 * The set command builtin.
9030 setcmd(int argc, char **argv)
9033 return showvars(nullstr, 0, VUNSET);
9037 if (*argptr != NULL) {
9045 #ifdef CONFIG_ASH_GETOPTS
9050 shellparam.optind = number(value);
9051 shellparam.optoff = -1;
9055 #ifdef CONFIG_LOCALE_SUPPORT
9056 static void change_lc_all(const char *value)
9058 if (value != 0 && *value != 0)
9059 setlocale(LC_ALL, value);
9062 static void change_lc_ctype(const char *value)
9064 if (value != 0 && *value != 0)
9065 setlocale(LC_CTYPE, value);
9070 #ifdef CONFIG_ASH_RANDOM_SUPPORT
9071 /* Roughly copied from bash.. */
9072 static void change_random(const char *value)
9075 /* "get", generate */
9078 rseed = rseed * 1103515245 + 12345;
9079 sprintf(buf, "%d", (unsigned int)((rseed & 32767)));
9080 /* set without recursion */
9081 setvar(vrandom.text, buf, VNOFUNC);
9082 vrandom.flags &= ~VNOFUNC;
9085 rseed = strtoul(value, (char **)NULL, 10);
9091 #ifdef CONFIG_ASH_GETOPTS
9093 getopts(char *optstr, char *optvar, char **optfirst, int *param_optind, int *optoff)
9102 if(*param_optind < 1)
9104 optnext = optfirst + *param_optind - 1;
9106 if (*param_optind <= 1 || *optoff < 0 || strlen(optnext[-1]) < *optoff)
9109 p = optnext[-1] + *optoff;
9110 if (p == NULL || *p == '\0') {
9111 /* Current word is done, advance */
9113 if (p == NULL || *p != '-' || *++p == '\0') {
9120 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
9125 for (q = optstr; *q != c; ) {
9127 if (optstr[0] == ':') {
9130 err |= setvarsafe("OPTARG", s, 0);
9132 fprintf(stderr, "Illegal option -%c\n", c);
9133 (void) unsetvar("OPTARG");
9143 if (*p == '\0' && (p = *optnext) == NULL) {
9144 if (optstr[0] == ':') {
9147 err |= setvarsafe("OPTARG", s, 0);
9150 fprintf(stderr, "No arg for -%c option\n", c);
9151 (void) unsetvar("OPTARG");
9159 err |= setvarsafe("OPTARG", p, 0);
9162 err |= setvarsafe("OPTARG", nullstr, 0);
9165 *optoff = p ? p - *(optnext - 1) : -1;
9166 *param_optind = optnext - optfirst + 1;
9167 fmtstr(s, sizeof(s), "%d", *param_optind);
9168 err |= setvarsafe("OPTIND", s, VNOFUNC);
9171 err |= setvarsafe(optvar, s, 0);
9182 * The getopts builtin. Shellparam.optnext points to the next argument
9183 * to be processed. Shellparam.optptr points to the next character to
9184 * be processed in the current argument. If shellparam.optnext is NULL,
9185 * then it's the first time getopts has been called.
9189 getoptscmd(int argc, char **argv)
9194 error("Usage: getopts optstring var [arg]");
9195 else if (argc == 3) {
9196 optbase = shellparam.p;
9197 if (shellparam.optind > shellparam.nparam + 1) {
9198 shellparam.optind = 1;
9199 shellparam.optoff = -1;
9204 if (shellparam.optind > argc - 2) {
9205 shellparam.optind = 1;
9206 shellparam.optoff = -1;
9210 return getopts(argv[1], argv[2], optbase, &shellparam.optind,
9211 &shellparam.optoff);
9213 #endif /* CONFIG_ASH_GETOPTS */
9216 * XXX - should get rid of. have all builtins use getopt(3). the
9217 * library getopt must have the BSD extension static variable "optreset"
9218 * otherwise it can't be used within the shell safely.
9220 * Standard option processing (a la getopt) for builtin routines. The
9221 * only argument that is passed to nextopt is the option string; the
9222 * other arguments are unnecessary. It return the character, or '\0' on
9227 nextopt(const char *optstring)
9233 if ((p = optptr) == NULL || *p == '\0') {
9235 if (p == NULL || *p != '-' || *++p == '\0')
9238 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
9242 for (q = optstring ; *q != c ; ) {
9244 error("Illegal option -%c", c);
9249 if (*p == '\0' && (p = *argptr++) == NULL)
9250 error("No arg for -%c option", c);
9259 /* $NetBSD: output.c,v 1.27 2002/11/24 22:35:42 christos Exp $ */
9262 outstr(const char *p, FILE *file)
9287 outcslow(int c, FILE *dest)
9297 out1fmt(const char *fmt, ...)
9304 r = vprintf(fmt, ap);
9312 fmtstr(char *outbuf, size_t length, const char *fmt, ...)
9319 ret = vsnprintf(outbuf, length, fmt, ap);
9327 /* $NetBSD: parser.c,v 1.54 2002/11/24 22:35:42 christos Exp $ */
9331 * Shell command parser.
9334 #define EOFMARKLEN 79
9338 struct heredoc *next; /* next here document in list */
9339 union node *here; /* redirection node */
9340 char *eofmark; /* string indicating end of input */
9341 int striptabs; /* if set, strip leading tabs */
9346 static struct heredoc *heredoclist; /* list of here documents to read */
9349 static union node *list(int);
9350 static union node *andor(void);
9351 static union node *pipeline(void);
9352 static union node *command(void);
9353 static union node *simplecmd(void);
9354 static union node *makename(void);
9355 static void parsefname(void);
9356 static void parseheredoc(void);
9357 static char peektoken(void);
9358 static int readtoken(void);
9359 static int xxreadtoken(void);
9360 static int readtoken1(int firstc, int syntax, char *eofmark, int striptabs);
9361 static int noexpand(char *);
9362 static void synexpect(int) __attribute__((__noreturn__));
9363 static void synerror(const char *) __attribute__((__noreturn__));
9364 static void setprompt(int);
9370 * Read and parse a command. Returns NEOF on end of file. (NULL is a
9371 * valid parse tree indicating a blank line.)
9375 parsecmd(int interact)
9380 doprompt = interact;
9382 setprompt(doprompt);
9397 union node *n1, *n2, *n3;
9400 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9401 if (nlflag == 2 && peektoken())
9407 if (tok == TBACKGND) {
9408 if (n2->type == NPIPE) {
9409 n2->npipe.backgnd = 1;
9411 if (n2->type != NREDIR) {
9412 n3 = stalloc(sizeof(struct nredir));
9414 n3->nredir.redirect = NULL;
9417 n2->type = NBACKGND;
9424 n3 = (union node *)stalloc(sizeof (struct nbinary));
9426 n3->nbinary.ch1 = n1;
9427 n3->nbinary.ch2 = n2;
9443 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9451 pungetc(); /* push back EOF on input */
9467 union node *n1, *n2, *n3;
9472 if ((t = readtoken()) == TAND) {
9474 } else if (t == TOR) {
9480 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9482 n3 = (union node *)stalloc(sizeof (struct nbinary));
9484 n3->nbinary.ch1 = n1;
9485 n3->nbinary.ch2 = n2;
9495 union node *n1, *n2, *pipenode;
9496 struct nodelist *lp, *prev;
9500 TRACE(("pipeline: entered\n"));
9501 if (readtoken() == TNOT) {
9503 checkkwd = CHKKWD | CHKALIAS;
9507 if (readtoken() == TPIPE) {
9508 pipenode = (union node *)stalloc(sizeof (struct npipe));
9509 pipenode->type = NPIPE;
9510 pipenode->npipe.backgnd = 0;
9511 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
9512 pipenode->npipe.cmdlist = lp;
9516 lp = (struct nodelist *)stalloc(sizeof (struct nodelist));
9517 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9520 } while (readtoken() == TPIPE);
9526 n2 = (union node *)stalloc(sizeof (struct nnot));
9539 union node *n1, *n2;
9540 union node *ap, **app;
9541 union node *cp, **cpp;
9542 union node *redir, **rpp;
9549 switch (readtoken()) {
9554 n1 = (union node *)stalloc(sizeof (struct nif));
9556 n1->nif.test = list(0);
9557 if (readtoken() != TTHEN)
9559 n1->nif.ifpart = list(0);
9561 while (readtoken() == TELIF) {
9562 n2->nif.elsepart = (union node *)stalloc(sizeof (struct nif));
9563 n2 = n2->nif.elsepart;
9565 n2->nif.test = list(0);
9566 if (readtoken() != TTHEN)
9568 n2->nif.ifpart = list(0);
9570 if (lasttoken == TELSE)
9571 n2->nif.elsepart = list(0);
9573 n2->nif.elsepart = NULL;
9581 n1 = (union node *)stalloc(sizeof (struct nbinary));
9582 n1->type = (lasttoken == TWHILE)? NWHILE : NUNTIL;
9583 n1->nbinary.ch1 = list(0);
9584 if ((got=readtoken()) != TDO) {
9585 TRACE(("expecting DO got %s %s\n", tokname(got), got == TWORD ? wordtext : ""));
9588 n1->nbinary.ch2 = list(0);
9593 if (readtoken() != TWORD || quoteflag || ! goodname(wordtext))
9594 synerror("Bad for loop variable");
9595 n1 = (union node *)stalloc(sizeof (struct nfor));
9597 n1->nfor.var = wordtext;
9598 checkkwd = CHKKWD | CHKALIAS;
9599 if (readtoken() == TIN) {
9601 while (readtoken() == TWORD) {
9602 n2 = (union node *)stalloc(sizeof (struct narg));
9604 n2->narg.text = wordtext;
9605 n2->narg.backquote = backquotelist;
9607 app = &n2->narg.next;
9611 if (lasttoken != TNL && lasttoken != TSEMI)
9614 n2 = (union node *)stalloc(sizeof (struct narg));
9616 n2->narg.text = (char *)dolatstr;
9617 n2->narg.backquote = NULL;
9618 n2->narg.next = NULL;
9621 * Newline or semicolon here is optional (but note
9622 * that the original Bourne shell only allowed NL).
9624 if (lasttoken != TNL && lasttoken != TSEMI)
9627 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9628 if (readtoken() != TDO)
9630 n1->nfor.body = list(0);
9634 n1 = (union node *)stalloc(sizeof (struct ncase));
9636 if (readtoken() != TWORD)
9638 n1->ncase.expr = n2 = (union node *)stalloc(sizeof (struct narg));
9640 n2->narg.text = wordtext;
9641 n2->narg.backquote = backquotelist;
9642 n2->narg.next = NULL;
9644 checkkwd = CHKKWD | CHKALIAS;
9645 } while (readtoken() == TNL);
9646 if (lasttoken != TIN)
9648 cpp = &n1->ncase.cases;
9650 checkkwd = CHKNL | CHKKWD;
9653 if (lasttoken == TLP)
9655 *cpp = cp = (union node *)stalloc(sizeof (struct nclist));
9657 app = &cp->nclist.pattern;
9659 *app = ap = (union node *)stalloc(sizeof (struct narg));
9661 ap->narg.text = wordtext;
9662 ap->narg.backquote = backquotelist;
9663 if (readtoken() != TPIPE)
9665 app = &ap->narg.next;
9668 ap->narg.next = NULL;
9669 if (lasttoken != TRP)
9671 cp->nclist.body = list(2);
9673 cpp = &cp->nclist.next;
9675 checkkwd = CHKNL | CHKKWD;
9676 if ((t = readtoken()) != TESAC) {
9678 synexpect(TENDCASE);
9686 n1 = (union node *)stalloc(sizeof (struct nredir));
9687 n1->type = NSUBSHELL;
9688 n1->nredir.n = list(0);
9689 n1->nredir.redirect = NULL;
9702 if (readtoken() != t)
9706 /* Now check for redirection which may follow command */
9707 checkkwd = CHKKWD | CHKALIAS;
9709 while (readtoken() == TREDIR) {
9710 *rpp = n2 = redirnode;
9711 rpp = &n2->nfile.next;
9717 if (n1->type != NSUBSHELL) {
9718 n2 = (union node *)stalloc(sizeof (struct nredir));
9723 n1->nredir.redirect = redir;
9732 union node *args, **app;
9733 union node *n = NULL;
9734 union node *vars, **vpp;
9735 union node **rpp, *redir;
9745 savecheckkwd = CHKALIAS;
9747 checkkwd = savecheckkwd;
9748 switch (readtoken()) {
9750 n = (union node *)stalloc(sizeof (struct narg));
9752 n->narg.text = wordtext;
9753 n->narg.backquote = backquotelist;
9754 if (savecheckkwd && isassignment(wordtext)) {
9756 vpp = &n->narg.next;
9759 app = &n->narg.next;
9764 *rpp = n = redirnode;
9765 rpp = &n->nfile.next;
9766 parsefname(); /* read name of redirection file */
9770 args && app == &args->narg.next &&
9773 struct builtincmd *bcmd;
9776 /* We have a function */
9777 if (readtoken() != TRP)
9779 name = n->narg.text;
9781 !goodname(name) || (
9782 (bcmd = find_builtin(name)) &&
9783 IS_BUILTIN_SPECIAL(bcmd)
9786 synerror("Bad function name");
9788 checkkwd = CHKNL | CHKKWD | CHKALIAS;
9789 n->narg.next = command();
9802 n = (union node *)stalloc(sizeof (struct ncmd));
9804 n->ncmd.args = args;
9805 n->ncmd.assign = vars;
9806 n->ncmd.redirect = redir;
9815 n = (union node *)stalloc(sizeof (struct narg));
9817 n->narg.next = NULL;
9818 n->narg.text = wordtext;
9819 n->narg.backquote = backquotelist;
9823 void fixredir(union node *n, const char *text, int err)
9825 TRACE(("Fix redir %s %d\n", text, err));
9827 n->ndup.vname = NULL;
9829 if (is_digit(text[0]) && text[1] == '\0')
9830 n->ndup.dupfd = digit_val(text[0]);
9831 else if (text[0] == '-' && text[1] == '\0')
9836 synerror("Bad fd number");
9838 n->ndup.vname = makename();
9846 union node *n = redirnode;
9848 if (readtoken() != TWORD)
9850 if (n->type == NHERE) {
9851 struct heredoc *here = heredoc;
9857 TRACE(("Here document %d\n", n->type));
9858 if (! noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN)
9859 synerror("Illegal eof marker for << redirection");
9860 rmescapes(wordtext);
9861 here->eofmark = wordtext;
9863 if (heredoclist == NULL)
9866 for (p = heredoclist ; p->next ; p = p->next);
9869 } else if (n->type == NTOFD || n->type == NFROMFD) {
9870 fixredir(n, wordtext, 0);
9872 n->nfile.fname = makename();
9878 * Input any here documents.
9884 struct heredoc *here;
9894 readtoken1(pgetc(), here->here->type == NHERE? SQSYNTAX : DQSYNTAX,
9895 here->eofmark, here->striptabs);
9896 n = (union node *)stalloc(sizeof (struct narg));
9897 n->narg.type = NARG;
9898 n->narg.next = NULL;
9899 n->narg.text = wordtext;
9900 n->narg.backquote = backquotelist;
9901 here->here->nhere.doc = n;
9906 static char peektoken(void)
9912 return tokname_array[t][0];
9920 int alreadyseen = tokpushback;
9923 #ifdef CONFIG_ASH_ALIAS
9932 if (checkkwd & CHKNL) {
9939 if (t != TWORD || quoteflag) {
9944 * check for keywords
9946 if (checkkwd & CHKKWD) {
9947 const char *const *pp;
9949 if ((pp = findkwd(wordtext))) {
9950 lasttoken = t = pp - tokname_array;
9951 TRACE(("keyword %s recognized\n", tokname(t)));
9956 if (checkkwd & CHKALIAS) {
9957 #ifdef CONFIG_ASH_ALIAS
9959 if ((ap = lookupalias(wordtext, 1)) != NULL) {
9961 pushstring(ap->val, ap);
9971 TRACE(("token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
9973 TRACE(("reread token %s %s\n", tokname(t), t == TWORD ? wordtext : ""));
9980 * Read the next input token.
9981 * If the token is a word, we set backquotelist to the list of cmds in
9982 * backquotes. We set quoteflag to true if any part of the word was
9984 * If the token is TREDIR, then we set redirnode to a structure containing
9986 * In all cases, the variable startlinno is set to the number of the line
9987 * on which the token starts.
9989 * [Change comment: here documents and internal procedures]
9990 * [Readtoken shouldn't have any arguments. Perhaps we should make the
9991 * word parsing code into a separate routine. In this case, readtoken
9992 * doesn't need to have any internal procedures, but parseword does.
9993 * We could also make parseoperator in essence the main routine, and
9994 * have parseword (readtoken1?) handle both words and redirection.]
9997 #define NEW_xxreadtoken
9998 #ifdef NEW_xxreadtoken
10000 /* singles must be first! */
10001 static const char xxreadtoken_chars[7] = { '\n', '(', ')', '&', '|', ';', 0 };
10003 static const char xxreadtoken_tokens[] = {
10004 TNL, TLP, TRP, /* only single occurrence allowed */
10005 TBACKGND, TPIPE, TSEMI, /* if single occurrence */
10006 TEOF, /* corresponds to trailing nul */
10007 TAND, TOR, TENDCASE, /* if double occurrence */
10010 #define xxreadtoken_doubles \
10011 (sizeof(xxreadtoken_tokens) - sizeof(xxreadtoken_chars))
10012 #define xxreadtoken_singles \
10013 (sizeof(xxreadtoken_chars) - xxreadtoken_doubles - 1)
10015 static int xxreadtoken()
10026 startlinno = plinno;
10027 for (;;) { /* until token or start of word found */
10030 if ((c != ' ') && (c != '\t')
10031 #ifdef CONFIG_ASH_ALIAS
10036 while ((c = pgetc()) != '\n' && c != PEOF);
10038 } else if (c == '\\') {
10039 if (pgetc() != '\n') {
10043 startlinno = ++plinno;
10048 = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1;
10053 needprompt = doprompt;
10056 p = strchr(xxreadtoken_chars, c);
10059 return readtoken1(c, BASESYNTAX, (char *) NULL, 0);
10062 if (p - xxreadtoken_chars >= xxreadtoken_singles) {
10063 if (pgetc() == *p) { /* double occurrence? */
10064 p += xxreadtoken_doubles + 1;
10071 return lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars];
10079 #define RETURN(token) return lasttoken = token
10093 startlinno = plinno;
10094 for (;;) { /* until token or start of word found */
10097 case ' ': case '\t':
10098 #ifdef CONFIG_ASH_ALIAS
10103 while ((c = pgetc()) != '\n' && c != PEOF);
10107 if (pgetc() == '\n') {
10108 startlinno = ++plinno;
10117 needprompt = doprompt;
10122 if (pgetc() == '&')
10127 if (pgetc() == '|')
10132 if (pgetc() == ';')
10145 return readtoken1(c, BASESYNTAX, (char *)NULL, 0);
10148 #endif /* NEW_xxreadtoken */
10152 * If eofmark is NULL, read a word or a redirection symbol. If eofmark
10153 * is not NULL, read a here document. In the latter case, eofmark is the
10154 * word which marks the end of the document and striptabs is true if
10155 * leading tabs should be stripped from the document. The argument firstc
10156 * is the first character of the input token or document.
10158 * Because C does not have internal subroutines, I have simulated them
10159 * using goto's to implement the subroutine linkage. The following macros
10160 * will run code that appears at the end of readtoken1.
10163 #define CHECKEND() {goto checkend; checkend_return:;}
10164 #define PARSEREDIR() {goto parseredir; parseredir_return:;}
10165 #define PARSESUB() {goto parsesub; parsesub_return:;}
10166 #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;}
10167 #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;}
10168 #define PARSEARITH() {goto parsearith; parsearith_return:;}
10171 readtoken1(int firstc, int syntax, char *eofmark, int striptabs)
10176 char line[EOFMARKLEN + 1];
10177 struct nodelist *bqlist;
10180 int varnest; /* levels of variables expansion */
10181 int arinest; /* levels of arithmetic expansion */
10182 int parenlevel; /* levels of parens in arithmetic */
10183 int dqvarnest; /* levels of variables expansion within double quotes */
10185 int prevsyntax; /* syntax before arithmetic */
10187 /* Avoid longjmp clobbering */
10193 (void) &parenlevel;
10196 (void) &prevsyntax;
10200 startlinno = plinno;
10202 if (syntax == DQSYNTAX)
10211 STARTSTACKSTR(out);
10212 loop: { /* for each line, until end of word */
10213 CHECKEND(); /* set c to PEOF if at end of here document */
10214 for (;;) { /* until end of line or end of word */
10215 CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */
10216 switch(SIT(c, syntax)) {
10217 case CNL: /* '\n' */
10218 if (syntax == BASESYNTAX)
10219 goto endword; /* exit outer loop */
10225 goto loop; /* continue outer loop */
10230 if (eofmark == NULL || dblquote)
10231 USTPUTC(CTLESC, out);
10234 case CBACK: /* backslash */
10237 USTPUTC(CTLESC, out);
10238 USTPUTC('\\', out);
10240 } else if (c == '\n') {
10246 c != '\\' && c != '`' &&
10252 USTPUTC(CTLESC, out);
10253 USTPUTC('\\', out);
10255 if (SIT(c, SQSYNTAX) == CCTL)
10256 USTPUTC(CTLESC, out);
10264 if (eofmark == NULL) {
10265 USTPUTC(CTLQUOTEMARK, out);
10273 if (eofmark != NULL && arinest == 0 &&
10277 if (dqvarnest == 0) {
10278 syntax = BASESYNTAX;
10285 case CVAR: /* '$' */
10286 PARSESUB(); /* parse substitution */
10288 case CENDVAR: /* '}' */
10291 if (dqvarnest > 0) {
10294 USTPUTC(CTLENDVAR, out);
10299 #ifdef CONFIG_ASH_MATH_SUPPORT
10300 case CLP: /* '(' in arithmetic */
10304 case CRP: /* ')' in arithmetic */
10305 if (parenlevel > 0) {
10309 if (pgetc() == ')') {
10310 if (--arinest == 0) {
10311 USTPUTC(CTLENDARI, out);
10312 syntax = prevsyntax;
10313 if (syntax == DQSYNTAX)
10321 * unbalanced parens
10322 * (don't 2nd guess - no error)
10330 case CBQUOTE: /* '`' */
10334 goto endword; /* exit outer loop */
10339 goto endword; /* exit outer loop */
10340 #ifdef CONFIG_ASH_ALIAS
10350 #ifdef CONFIG_ASH_MATH_SUPPORT
10351 if (syntax == ARISYNTAX)
10352 synerror("Missing '))'");
10354 if (syntax != BASESYNTAX && ! parsebackquote && eofmark == NULL)
10355 synerror("Unterminated quoted string");
10356 if (varnest != 0) {
10357 startlinno = plinno;
10359 synerror("Missing '}'");
10361 USTPUTC('\0', out);
10362 len = out - (char *)stackblock();
10363 out = stackblock();
10364 if (eofmark == NULL) {
10365 if ((c == '>' || c == '<')
10368 && (*out == '\0' || is_digit(*out))) {
10370 return lasttoken = TREDIR;
10375 quoteflag = quotef;
10376 backquotelist = bqlist;
10377 grabstackblock(len);
10379 return lasttoken = TWORD;
10380 /* end of readtoken routine */
10385 * Check to see whether we are at the end of the here document. When this
10386 * is called, c is set to the first character of the next input line. If
10387 * we are at the end of the here document, this routine sets the c to PEOF.
10392 #ifdef CONFIG_ASH_ALIAS
10398 while (c == '\t') {
10402 if (c == *eofmark) {
10403 if (pfgets(line, sizeof line) != NULL) {
10407 for (q = eofmark + 1 ; *q && *p == *q ; p++, q++);
10408 if (*p == '\n' && *q == '\0') {
10411 needprompt = doprompt;
10413 pushstring(line, NULL);
10418 goto checkend_return;
10423 * Parse a redirection operator. The variable "out" points to a string
10424 * specifying the fd to be redirected. The variable "c" contains the
10425 * first character of the redirection operator.
10432 np = (union node *)stalloc(sizeof (struct nfile));
10437 np->type = NAPPEND;
10439 np->type = NCLOBBER;
10446 } else { /* c == '<' */
10448 switch (c = pgetc()) {
10450 if (sizeof (struct nfile) != sizeof (struct nhere)) {
10451 np = (union node *)stalloc(sizeof (struct nhere));
10455 heredoc = (struct heredoc *)stalloc(sizeof (struct heredoc));
10456 heredoc->here = np;
10457 if ((c = pgetc()) == '-') {
10458 heredoc->striptabs = 1;
10460 heredoc->striptabs = 0;
10466 np->type = NFROMFD;
10470 np->type = NFROMTO;
10480 np->nfile.fd = digit_val(fd);
10482 goto parseredir_return;
10487 * Parse a substitution. At this point, we have read the dollar sign
10488 * and nothing else.
10496 static const char types[] = "}-+?=";
10500 c <= PEOA_OR_PEOF ||
10501 (c != '(' && c != '{' && !is_name(c) && !is_special(c))
10505 } else if (c == '(') { /* $(command) or $((arith)) */
10506 if (pgetc() == '(') {
10507 #ifdef CONFIG_ASH_MATH_SUPPORT
10510 synerror("We unsupport $((arith))");
10517 USTPUTC(CTLVAR, out);
10518 typeloc = out - (char *)stackblock();
10519 USTPUTC(VSNORMAL, out);
10520 subtype = VSNORMAL;
10524 if ((c = pgetc()) == '}')
10527 subtype = VSLENGTH;
10532 if (c > PEOA_OR_PEOF && is_name(c)) {
10536 } while (c > PEOA_OR_PEOF && is_in_name(c));
10537 } else if (is_digit(c)) {
10541 } while (is_digit(c));
10543 else if (is_special(c)) {
10548 badsub: synerror("Bad substitution");
10552 if (subtype == 0) {
10559 p = strchr(types, c);
10562 subtype = p - types + VSNORMAL;
10568 subtype = c == '#' ? VSTRIMLEFT :
10581 if (dblquote || arinest)
10583 *((char *)stackblock() + typeloc) = subtype | flags;
10584 if (subtype != VSNORMAL) {
10586 if (dblquote || arinest) {
10591 goto parsesub_return;
10596 * Called to parse command substitutions. Newstyle is set if the command
10597 * is enclosed inside $(...); nlpp is a pointer to the head of the linked
10598 * list of commands (passed by reference), and savelen is the number of
10599 * characters on the top of the stack which must be preserved.
10603 struct nodelist **nlpp;
10606 char *volatile str;
10607 struct jmploc jmploc;
10608 struct jmploc *volatile savehandler;
10612 (void) &saveprompt;
10615 savepbq = parsebackquote;
10616 if (setjmp(jmploc.loc)) {
10619 parsebackquote = 0;
10620 handler = savehandler;
10621 longjmp(handler->loc, 1);
10625 savelen = out - (char *)stackblock();
10627 str = ckmalloc(savelen);
10628 memcpy(str, stackblock(), savelen);
10630 savehandler = handler;
10634 /* We must read until the closing backquote, giving special
10635 treatment to some slashes, and then push the string and
10636 reread it as input, interpreting it normally. */
10643 STARTSTACKSTR(pout);
10648 switch (pc = pgetc()) {
10653 if ((pc = pgetc()) == '\n') {
10658 * If eating a newline, avoid putting
10659 * the newline into the new character
10660 * stream (via the STPUTC after the
10665 if (pc != '\\' && pc != '`' && pc != '$'
10666 && (!dblquote || pc != '"'))
10667 STPUTC('\\', pout);
10668 if (pc > PEOA_OR_PEOF) {
10674 #ifdef CONFIG_ASH_ALIAS
10677 startlinno = plinno;
10678 synerror("EOF in backquote substitution");
10682 needprompt = doprompt;
10691 STPUTC('\0', pout);
10692 psavelen = pout - (char *)stackblock();
10693 if (psavelen > 0) {
10694 pstr = grabstackstr(pout);
10695 setinputstring(pstr);
10700 nlpp = &(*nlpp)->next;
10701 *nlpp = (struct nodelist *)stalloc(sizeof (struct nodelist));
10702 (*nlpp)->next = NULL;
10703 parsebackquote = oldstyle;
10706 saveprompt = doprompt;
10713 doprompt = saveprompt;
10715 if (readtoken() != TRP)
10722 * Start reading from old file again, ignoring any pushed back
10723 * tokens left from the backquote parsing
10728 while (stackblocksize() <= savelen)
10730 STARTSTACKSTR(out);
10732 memcpy(out, str, savelen);
10733 STADJUST(savelen, out);
10739 parsebackquote = savepbq;
10740 handler = savehandler;
10741 if (arinest || dblquote)
10742 USTPUTC(CTLBACKQ | CTLQUOTE, out);
10744 USTPUTC(CTLBACKQ, out);
10746 goto parsebackq_oldreturn;
10748 goto parsebackq_newreturn;
10751 #ifdef CONFIG_ASH_MATH_SUPPORT
10753 * Parse an arithmetic expansion (indicate start of one and set state)
10757 if (++arinest == 1) {
10758 prevsyntax = syntax;
10759 syntax = ARISYNTAX;
10760 USTPUTC(CTLARI, out);
10767 * we collapse embedded arithmetic expansion to
10768 * parenthesis, which should be equivalent
10772 goto parsearith_return;
10776 } /* end of readtoken */
10781 * Returns true if the text contains nothing to expand (no dollar signs
10786 noexpand(char *text)
10792 while ((c = *p++) != '\0') {
10793 if (c == CTLQUOTEMARK)
10797 else if (SIT(c, BASESYNTAX) == CCTL)
10805 * Return of a legal variable name (a letter or underscore followed by zero or
10806 * more letters, underscores, and digits).
10810 endofname(const char *name)
10818 if (! is_in_name(*p))
10826 * Called when an unexpected token is read during the parse. The argument
10827 * is the token that is expected, or -1 if more than one type of token can
10828 * occur at this point.
10831 static void synexpect(int token)
10836 l = sprintf(msg, "%s unexpected", tokname(lasttoken));
10838 sprintf(msg + l, " (expecting %s)", tokname(token));
10844 synerror(const char *msg)
10846 error("Syntax error: %s", msg);
10852 * called by editline -- any expansions to the prompt
10853 * should be added here.
10856 #ifdef CONFIG_ASH_EXPAND_PRMT
10857 static const char *
10858 expandstr(const char *ps)
10862 /* XXX Fix (char *) cast. */
10863 setinputstring((char *)ps);
10864 readtoken1(pgetc(), DQSYNTAX, nullstr, 0);
10867 n.narg.type = NARG;
10868 n.narg.next = NULL;
10869 n.narg.text = wordtext;
10870 n.narg.backquote = backquotelist;
10872 expandarg(&n, NULL, 0);
10873 return stackblock();
10877 static void setprompt(int whichprompt)
10879 const char *prompt;
10880 #ifdef CONFIG_ASH_EXPAND_PRMT
10881 struct stackmark smark;
10886 switch (whichprompt) {
10896 #ifdef CONFIG_ASH_EXPAND_PRMT
10897 setstackmark(&smark);
10898 stalloc(stackblocksize());
10900 putprompt(expandstr(prompt));
10901 #ifdef CONFIG_ASH_EXPAND_PRMT
10902 popstackmark(&smark);
10907 static const char *const *findkwd(const char *s)
10909 return bsearch(s, tokname_array + KWDOFFSET,
10910 (sizeof(tokname_array) / sizeof(const char *)) - KWDOFFSET,
10911 sizeof(const char *), pstrcmp);
10914 /* $NetBSD: redir.c,v 1.27 2002/11/24 22:35:42 christos Exp $ */
10917 * Code for dealing with input/output redirection.
10920 #define EMPTY -2 /* marks an unused slot in redirtab */
10922 # define PIPESIZE 4096 /* amount of buffering in a pipe */
10924 # define PIPESIZE PIPE_BUF
10928 * Open a file in noclobber mode.
10929 * The code was copied from bash.
10932 noclobberopen(const char *fname)
10935 struct stat finfo, finfo2;
10938 * If the file exists and is a regular file, return an error
10941 r = stat(fname, &finfo);
10942 if (r == 0 && S_ISREG(finfo.st_mode)) {
10948 * If the file was not present (r != 0), make sure we open it
10949 * exclusively so that if it is created before we open it, our open
10950 * will fail. Make sure that we do not truncate an existing file.
10951 * Note that we don't turn on O_EXCL unless the stat failed -- if the
10952 * file was not a regular file, we leave O_EXCL off.
10955 return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666);
10956 fd = open(fname, O_WRONLY|O_CREAT, 0666);
10958 /* If the open failed, return the file descriptor right away. */
10963 * OK, the open succeeded, but the file may have been changed from a
10964 * non-regular file to a regular file between the stat and the open.
10965 * We are assuming that the O_EXCL open handles the case where FILENAME
10966 * did not exist and is symlinked to an existing file between the stat
10971 * If we can open it and fstat the file descriptor, and neither check
10972 * revealed that it was a regular file, and the file has not been
10973 * replaced, return the file descriptor.
10975 if (fstat(fd, &finfo2) == 0 && !S_ISREG(finfo2.st_mode) &&
10976 finfo.st_dev == finfo2.st_dev && finfo.st_ino == finfo2.st_ino)
10979 /* The file has been replaced. badness. */
10986 * Handle here documents. Normally we fork off a process to write the
10987 * data to a pipe. If the document is short, we can stuff the data in
10988 * the pipe without forking.
10992 openhere(union node *redir)
10998 error("Pipe call failed");
10999 if (redir->type == NHERE) {
11000 len = strlen(redir->nhere.doc->narg.text);
11001 if (len <= PIPESIZE) {
11002 bb_full_write(pip[1], redir->nhere.doc->narg.text, len);
11006 if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) {
11008 signal(SIGINT, SIG_IGN);
11009 signal(SIGQUIT, SIG_IGN);
11010 signal(SIGHUP, SIG_IGN);
11012 signal(SIGTSTP, SIG_IGN);
11014 signal(SIGPIPE, SIG_DFL);
11015 if (redir->type == NHERE)
11016 bb_full_write(pip[1], redir->nhere.doc->narg.text, len);
11018 expandhere(redir->nhere.doc, pip[1]);
11027 openredirect(union node *redir)
11032 switch (redir->nfile.type) {
11034 fname = redir->nfile.expfname;
11035 if ((f = open(fname, O_RDONLY)) < 0)
11039 fname = redir->nfile.expfname;
11040 if ((f = open(fname, O_RDWR|O_CREAT|O_TRUNC, 0666)) < 0)
11044 /* Take care of noclobber mode. */
11046 fname = redir->nfile.expfname;
11047 if ((f = noclobberopen(fname)) < 0)
11053 fname = redir->nfile.expfname;
11054 if ((f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666)) < 0)
11058 fname = redir->nfile.expfname;
11059 if ((f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666)) < 0)
11066 /* Fall through to eliminate warning. */
11073 f = openhere(redir);
11079 error("cannot create %s: %s", fname, errmsg(errno, E_CREAT));
11081 error("cannot open %s: %s", fname, errmsg(errno, E_OPEN));
11085 dupredirect(union node *redir, int f)
11087 int fd = redir->nfile.fd;
11089 if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) {
11090 if (redir->ndup.dupfd >= 0) { /* if not ">&-" */
11091 copyfd(redir->ndup.dupfd, fd);
11104 * Process a list of redirection commands. If the REDIR_PUSH flag is set,
11105 * old file descriptors are stashed away so that the redirection can be
11106 * undone by calling popredir. If the REDIR_BACKQ flag is set, then the
11107 * standard output, and the standard error if it becomes a duplicate of
11108 * stdout, is saved in memory.
11112 redirect(union node *redir, int flags)
11115 struct redirtab *sv;
11126 if (flags & REDIR_PUSH) {
11127 struct redirtab *q;
11128 q = ckmalloc(sizeof (struct redirtab));
11129 q->next = redirlist;
11131 q->nullredirs = nullredirs - 1;
11132 for (i = 0 ; i < 10 ; i++)
11133 q->renamed[i] = EMPTY;
11140 if ((n->nfile.type == NTOFD || n->nfile.type == NFROMFD) &&
11141 n->ndup.dupfd == fd)
11142 continue; /* redirect from/to same file descriptor */
11144 newfd = openredirect(n);
11147 if (sv && *(p = &sv->renamed[fd]) == EMPTY) {
11148 i = fcntl(fd, F_DUPFD, 10);
11155 error("%d: %m", fd);
11165 dupredirect(n, newfd);
11166 } while ((n = n->nfile.next));
11168 if (flags & REDIR_SAVEFD2 && sv && sv->renamed[2] >= 0)
11169 preverrout_fd = sv->renamed[2];
11174 * Undo the effects of the last redirection.
11180 struct redirtab *rp;
11183 if (--nullredirs >= 0)
11187 for (i = 0 ; i < 10 ; i++) {
11188 if (rp->renamed[i] != EMPTY) {
11191 copyfd(rp->renamed[i], i);
11193 close(rp->renamed[i]);
11196 redirlist = rp->next;
11197 nullredirs = rp->nullredirs;
11203 * Undo all redirections. Called on error or interrupt.
11207 * Discard all saved file descriptors.
11211 clearredir(int drop)
11223 * Copy a file descriptor to be >= to. Returns -1
11224 * if the source file descriptor is closed, EMPTY if there are no unused
11225 * file descriptors left.
11229 copyfd(int from, int to)
11233 newfd = fcntl(from, F_DUPFD, to);
11235 if (errno == EMFILE)
11238 error("%d: %m", from);
11245 redirectsafe(union node *redir, int flags)
11248 volatile int saveint;
11249 struct jmploc *volatile savehandler = handler;
11250 struct jmploc jmploc;
11253 if (!(err = setjmp(jmploc.loc) * 2)) {
11255 redirect(redir, flags);
11257 handler = savehandler;
11258 if (err && exception != EXERROR)
11259 longjmp(handler->loc, 1);
11260 RESTOREINT(saveint);
11264 /* $NetBSD: show.c,v 1.24 2003/01/22 20:36:04 dsl Exp $ */
11267 static void shtree(union node *, int, char *, FILE*);
11268 static void shcmd(union node *, FILE *);
11269 static void sharg(union node *, FILE *);
11270 static void indent(int, char *, FILE *);
11271 static void trstring(char *);
11275 showtree(union node *n)
11277 trputs("showtree called\n");
11278 shtree(n, 1, NULL, stdout);
11283 shtree(union node *n, int ind, char *pfx, FILE *fp)
11285 struct nodelist *lp;
11291 indent(ind, pfx, fp);
11302 shtree(n->nbinary.ch1, ind, NULL, fp);
11305 shtree(n->nbinary.ch2, ind, NULL, fp);
11313 for (lp = n->npipe.cmdlist ; lp ; lp = lp->next) {
11318 if (n->npipe.backgnd)
11324 fprintf(fp, "<node type %d>", n->type);
11333 shcmd(union node *cmd, FILE *fp)
11341 for (np = cmd->ncmd.args ; np ; np = np->narg.next) {
11347 for (np = cmd->ncmd.redirect ; np ; np = np->nfile.next) {
11350 switch (np->nfile.type) {
11351 case NTO: s = ">"; dftfd = 1; break;
11352 case NCLOBBER: s = ">|"; dftfd = 1; break;
11353 case NAPPEND: s = ">>"; dftfd = 1; break;
11354 case NTOFD: s = ">&"; dftfd = 1; break;
11355 case NFROM: s = "<"; dftfd = 0; break;
11356 case NFROMFD: s = "<&"; dftfd = 0; break;
11357 case NFROMTO: s = "<>"; dftfd = 0; break;
11358 default: s = "*error*"; dftfd = 0; break;
11360 if (np->nfile.fd != dftfd)
11361 fprintf(fp, "%d", np->nfile.fd);
11363 if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) {
11364 fprintf(fp, "%d", np->ndup.dupfd);
11366 sharg(np->nfile.fname, fp);
11375 sharg(union node *arg, FILE *fp)
11378 struct nodelist *bqlist;
11381 if (arg->type != NARG) {
11382 out1fmt("<node type %d>\n", arg->type);
11385 bqlist = arg->narg.backquote;
11386 for (p = arg->narg.text ; *p ; p++) {
11395 if (subtype == VSLENGTH)
11401 if (subtype & VSNUL)
11404 switch (subtype & VSTYPE) {
11423 case VSTRIMLEFTMAX:
11430 case VSTRIMRIGHTMAX:
11437 out1fmt("<subtype %d>", subtype);
11444 case CTLBACKQ|CTLQUOTE:
11447 shtree(bqlist->n, -1, NULL, fp);
11459 indent(int amount, char *pfx, FILE *fp)
11463 for (i = 0 ; i < amount ; i++) {
11464 if (pfx && i == amount - 1)
11485 putc(c, tracefile);
11489 trace(const char *fmt, ...)
11496 (void) vfprintf(tracefile, fmt, va);
11501 tracev(const char *fmt, va_list va)
11505 (void) vfprintf(tracefile, fmt, va);
11510 trputs(const char *s)
11514 fputs(s, tracefile);
11526 putc('"', tracefile);
11527 for (p = s ; *p ; p++) {
11529 case '\n': c = 'n'; goto backslash;
11530 case '\t': c = 't'; goto backslash;
11531 case '\r': c = 'r'; goto backslash;
11532 case '"': c = '"'; goto backslash;
11533 case '\\': c = '\\'; goto backslash;
11534 case CTLESC: c = 'e'; goto backslash;
11535 case CTLVAR: c = 'v'; goto backslash;
11536 case CTLVAR+CTLQUOTE: c = 'V'; goto backslash;
11537 case CTLBACKQ: c = 'q'; goto backslash;
11538 case CTLBACKQ+CTLQUOTE: c = 'Q'; goto backslash;
11539 backslash: putc('\\', tracefile);
11540 putc(c, tracefile);
11543 if (*p >= ' ' && *p <= '~')
11544 putc(*p, tracefile);
11546 putc('\\', tracefile);
11547 putc(*p >> 6 & 03, tracefile);
11548 putc(*p >> 3 & 07, tracefile);
11549 putc(*p & 07, tracefile);
11554 putc('"', tracefile);
11566 putc(' ', tracefile);
11568 putc('\n', tracefile);
11584 /* leave open because libedit might be using it */
11587 scopy("./trace", s);
11589 if (!freopen(s, "a", tracefile)) {
11590 fprintf(stderr, "Can't re-open %s\n", s);
11595 if ((tracefile = fopen(s, "a")) == NULL) {
11596 fprintf(stderr, "Can't open %s\n", s);
11602 if ((flags = fcntl(fileno(tracefile), F_GETFL, 0)) >= 0)
11603 fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND);
11605 setlinebuf(tracefile);
11606 fputs("\nTracing started.\n", tracefile);
11611 /* $NetBSD: trap.c,v 1.28 2002/11/24 22:35:43 christos Exp $ */
11614 * Sigmode records the current value of the signal handlers for the various
11615 * modes. A value of zero means that the current handler is not known.
11616 * S_HARD_IGN indicates that the signal was ignored on entry to the shell,
11619 #define S_DFL 1 /* default signal handling (SIG_DFL) */
11620 #define S_CATCH 2 /* signal is caught */
11621 #define S_IGN 3 /* signal is ignored (SIG_IGN) */
11622 #define S_HARD_IGN 4 /* signal is ignored permenantly */
11623 #define S_RESET 5 /* temporary - to reset a hard ignored sig */
11628 * The trap builtin.
11632 trapcmd(int argc, char **argv)
11641 for (signo = 0 ; signo < NSIG ; signo++) {
11642 if (trap[signo] != NULL) {
11645 sn = u_signal_names(0, &signo, 0);
11648 out1fmt("trap -- %s %s\n",
11649 single_quote(trap[signo]), sn);
11659 if ((signo = decode_signal(*ap, 0)) < 0)
11660 error("%s: bad trap", *ap);
11663 if (action[0] == '-' && action[1] == '\0')
11666 action = savestr(action);
11669 ckfree(trap[signo]);
11670 trap[signo] = action;
11681 * Clear traps on a fork.
11689 for (tp = trap ; tp < &trap[NSIG] ; tp++) {
11690 if (*tp && **tp) { /* trap not NULL or SIG_IGN */
11694 if (tp != &trap[0])
11695 setsignal(tp - trap);
11703 * Set the signal handler for the specified signal. The routine figures
11704 * out what it should be set to.
11708 setsignal(int signo)
11712 struct sigaction act;
11714 if ((t = trap[signo]) == NULL)
11716 else if (*t != '\0')
11720 if (rootshell && action == S_DFL) {
11723 if (iflag || minusc || sflag == 0)
11746 t = &sigmode[signo - 1];
11750 * current setting unknown
11752 if (sigaction(signo, 0, &act) == -1) {
11754 * Pretend it worked; maybe we should give a warning
11755 * here, but other shells don't. We don't alter
11756 * sigmode, so that we retry every time.
11760 if (act.sa_handler == SIG_IGN) {
11761 if (mflag && (signo == SIGTSTP ||
11762 signo == SIGTTIN || signo == SIGTTOU)) {
11763 tsig = S_IGN; /* don't hard ignore these */
11767 tsig = S_RESET; /* force to be set */
11770 if (tsig == S_HARD_IGN || tsig == action)
11774 act.sa_handler = onsig;
11777 act.sa_handler = SIG_IGN;
11780 act.sa_handler = SIG_DFL;
11784 sigfillset(&act.sa_mask);
11785 sigaction(signo, &act, 0);
11793 ignoresig(int signo)
11795 if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) {
11796 signal(signo, SIG_IGN);
11798 sigmode[signo - 1] = S_HARD_IGN;
11809 gotsig[signo - 1] = 1;
11810 pendingsigs = signo;
11812 if (exsig || (signo == SIGINT && !trap[SIGINT])) {
11821 * Called to execute a trap. Perhaps we should avoid entering new trap
11822 * handlers while we are executing a trap handler.
11832 savestatus = exitstatus;
11834 while (pendingsigs = 0, xbarrier(), (p = memchr(q, 1, NSIG - 1))) {
11836 p = trap[p - q + 1];
11840 exitstatus = savestatus;
11846 * Controls whether the shell is interactive or not.
11850 setinteractive(int on)
11852 static int is_interactive;
11854 if (++on == is_interactive)
11856 is_interactive = on;
11858 setsignal(SIGQUIT);
11859 setsignal(SIGTERM);
11860 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
11861 if(is_interactive > 1) {
11862 /* Looks like they want an interactive shell */
11863 static int do_banner;
11867 "\n\n" BB_BANNER " Built-in shell (ash)\n"
11868 "Enter 'help' for a list of built-in commands.\n\n");
11876 #ifndef CONFIG_FEATURE_SH_EXTRA_QUIET
11877 /*** List the available builtins ***/
11879 static int helpcmd(int argc, char **argv)
11883 out1fmt("\nBuilt-in commands:\n-------------------\n");
11884 for (col = 0, i = 0; i < NUMBUILTINS; i++) {
11885 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '),
11886 builtincmd[i].name + 1);
11892 #ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
11894 extern const struct BB_applet applets[];
11895 extern const size_t NUM_APPLETS;
11897 for (i = 0; i < NUM_APPLETS; i++) {
11899 col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), applets[i].name);
11908 return EXIT_SUCCESS;
11910 #endif /* CONFIG_FEATURE_SH_EXTRA_QUIET */
11913 * Called to exit the shell.
11924 jmp = setjmp(loc.loc);
11925 status = exitstatus;
11926 TRACE(("pid %d, exitshell(%d)\n", getpid(), status));
11930 if ((p = trap[0]) != NULL && *p != '\0') {
11936 #ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
11937 if (iflag && rootshell) {
11938 const char *hp = lookupvar("HISTFILE");
11941 save_history ( hp );
11949 static int decode_signal(const char *string, int minsig)
11952 const char *name = u_signal_names(string, &signo, minsig);
11954 return name ? signo : -1;
11957 /* $NetBSD: var.c,v 1.32 2003/01/22 20:36:04 dsl Exp $ */
11959 static struct var *vartab[VTABSIZE];
11961 static int vpcmp(const void *, const void *);
11962 static struct var **findvar(struct var **, const char *);
11965 * Initialize the variable symbol tables and import the environment
11969 #ifdef CONFIG_ASH_GETOPTS
11971 * Safe version of setvar, returns 1 on success 0 on failure.
11975 setvarsafe(const char *name, const char *val, int flags)
11978 volatile int saveint;
11979 struct jmploc *volatile savehandler = handler;
11980 struct jmploc jmploc;
11983 if (setjmp(jmploc.loc))
11987 setvar(name, val, flags);
11990 handler = savehandler;
11991 RESTOREINT(saveint);
11997 * Set the value of a variable. The flags argument is ored with the
11998 * flags of the variable. If val is NULL, the variable is unset.
12002 setvar(const char *name, const char *val, int flags)
12009 q = endofname(name);
12010 p = strchrnul(q, '=');
12011 namelen = p - name;
12012 if (!namelen || p != q)
12013 error("%.*s: bad variable name", namelen, name);
12018 vallen = strlen(val);
12021 p = mempcpy(nameeq = ckmalloc(namelen + vallen + 2), name, namelen);
12025 p = mempcpy(p, val, vallen);
12028 setvareq(nameeq, flags | VNOSAVE);
12034 * Same as setvar except that the variable and value are passed in
12035 * the first argument as name=value. Since the first argument will
12036 * be actually stored in the table, it should not be a string that
12038 * Called with interrupts off.
12042 setvareq(char *s, int flags)
12044 struct var *vp, **vpp;
12047 flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
12048 vp = *findvar(vpp, s);
12050 if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
12053 if (flags & VNOSAVE)
12056 error("%.*s: is read only", strchrnul(n, '=') - n, n);
12059 if (flags & VNOSET)
12062 if (vp->func && (flags & VNOFUNC) == 0)
12063 (*vp->func)(strchrnul(s, '=') + 1);
12065 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
12068 flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET);
12070 if (flags & VNOSET)
12073 vp = ckmalloc(sizeof (*vp));
12078 if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE)))
12086 * Process a linked list of variable assignments.
12090 listsetvar(struct strlist *list_set_var, int flags)
12092 struct strlist *lp = list_set_var;
12098 setvareq(lp->text, flags);
12099 } while ((lp = lp->next));
12105 * Find the value of a variable. Returns NULL if not set.
12109 lookupvar(const char *name)
12113 if ((v = *findvar(hashvar(name), name))) {
12116 * Dynamic variables are implemented roughly the same way they are
12117 * in bash. Namely, they're "special" so long as they aren't unset.
12118 * As soon as they're unset, they're no longer dynamic, and dynamic
12119 * lookup will no longer happen at that point. -- PFM.
12121 if((v->flags & VDYNAMIC))
12124 if(!(v->flags & VUNSET))
12125 return strchrnul(v->text, '=') + 1;
12133 * Search the environment of a builtin command.
12137 bltinlookup(const char *name)
12139 struct strlist *sp;
12141 for (sp = cmdenviron ; sp ; sp = sp->next) {
12142 if (varequal(sp->text, name))
12143 return strchrnul(sp->text, '=') + 1;
12145 return lookupvar(name);
12150 * Generate a list of variables satisfying the given conditions.
12154 listvars(int on, int off, char ***end)
12165 for (vp = *vpp ; vp ; vp = vp->next)
12166 if ((vp->flags & mask) == on) {
12167 if (ep == stackstrend())
12168 ep = growstackstr();
12169 *ep++ = (char *) vp->text;
12171 } while (++vpp < vartab + VTABSIZE);
12172 if (ep == stackstrend())
12173 ep = growstackstr();
12177 return grabstackstr(ep);
12182 * POSIX requires that 'set' (but not export or readonly) output the
12183 * variables in lexicographic order - by the locale's collating order (sigh).
12184 * Maybe we could keep them in an ordered balanced binary tree
12185 * instead of hashed lists.
12186 * For now just roll 'em through qsort for printing...
12190 showvars(const char *sep_prefix, int on, int off)
12193 char **ep, **epend;
12195 ep = listvars(on, off, &epend);
12196 qsort(ep, epend - ep, sizeof(char *), vpcmp);
12198 sep = *sep_prefix ? spcstr : sep_prefix;
12200 for (; ep < epend; ep++) {
12204 p = strchrnul(*ep, '=');
12207 q = single_quote(++p);
12209 out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q);
12218 * The export and readonly commands.
12222 exportcmd(int argc, char **argv)
12228 int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
12231 notp = nextopt("p") - 'p';
12232 if (notp && ((name = *(aptr = argptr)))) {
12234 if ((p = strchr(name, '=')) != NULL) {
12237 if ((vp = *findvar(hashvar(name), name))) {
12242 setvar(name, p, flag);
12243 } while ((name = *++aptr) != NULL);
12245 showvars(argv[0], flag, 0);
12252 * Make a variable a local variable. When a variable is made local, it's
12253 * value and flags are saved in a localvar structure. The saved values
12254 * will be restored when the shell function returns. We handle the name
12255 * "-" as a special case.
12259 mklocal(char *name)
12261 struct localvar *lvp;
12266 lvp = ckmalloc(sizeof (struct localvar));
12267 if (name[0] == '-' && name[1] == '\0') {
12269 p = ckmalloc(sizeof(optlist));
12270 lvp->text = memcpy(p, optlist, sizeof(optlist));
12275 vpp = hashvar(name);
12276 vp = *findvar(vpp, name);
12277 eq = strchr(name, '=');
12280 setvareq(name, VSTRFIXED);
12282 setvar(name, NULL, VSTRFIXED);
12283 vp = *vpp; /* the new variable */
12284 lvp->flags = VUNSET;
12286 lvp->text = vp->text;
12287 lvp->flags = vp->flags;
12288 vp->flags |= VSTRFIXED|VTEXTFIXED;
12294 lvp->next = localvars;
12300 * The "local" command.
12304 localcmd(int argc, char **argv)
12309 while ((name = *argv++) != NULL) {
12317 * Called after a function returns.
12318 * Interrupts must be off.
12324 struct localvar *lvp;
12327 while ((lvp = localvars) != NULL) {
12328 localvars = lvp->next;
12330 TRACE(("poplocalvar %s", vp ? vp->text : "-"));
12331 if (vp == NULL) { /* $- saved */
12332 memcpy(optlist, lvp->text, sizeof(optlist));
12335 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
12336 unsetvar(vp->text);
12339 (*vp->func)(strchrnul(lvp->text, '=') + 1);
12340 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
12342 vp->flags = lvp->flags;
12343 vp->text = lvp->text;
12351 * The unset builtin command. We unset the function before we unset the
12352 * variable to allow a function to be unset when there is a readonly variable
12353 * with the same name.
12357 unsetcmd(int argc, char **argv)
12364 while ((i = nextopt("vf")) != '\0') {
12368 for (ap = argptr; *ap ; ap++) {
12383 * Unset the specified variable.
12387 unsetvar(const char *s)
12393 vpp = findvar(hashvar(s), s);
12397 int flags = vp->flags;
12400 if (flags & VREADONLY)
12403 vp->flags &= ~VDYNAMIC;
12405 if (flags & VUNSET)
12407 if ((flags & VSTRFIXED) == 0) {
12409 if ((flags & (VTEXTFIXED|VSTACK)) == 0)
12416 vp->flags &= ~VEXPORT;
12429 * Find the appropriate entry in the hash table from the name.
12432 static struct var **
12433 hashvar(const char *p)
12435 unsigned int hashval;
12437 hashval = ((unsigned char) *p) << 4;
12438 while (*p && *p != '=')
12439 hashval += (unsigned char) *p++;
12440 return &vartab[hashval % VTABSIZE];
12446 * Compares two strings up to the first = or '\0'. The first
12447 * string must be terminated by '='; the second may be terminated by
12448 * either '=' or '\0'.
12452 varcmp(const char *p, const char *q)
12456 while ((c = *p) == (d = *q)) {
12457 if (!c || c == '=')
12471 vpcmp(const void *a, const void *b)
12473 return varcmp(*(const char **)a, *(const char **)b);
12476 static struct var **
12477 findvar(struct var **vpp, const char *name)
12479 for (; *vpp; vpp = &(*vpp)->next) {
12480 if (varequal((*vpp)->text, name)) {
12486 /* $NetBSD: setmode.c,v 1.29 2003/01/15 23:58:03 kleink Exp $ */
12488 #include <sys/times.h>
12490 static const unsigned char timescmd_str[] = {
12491 ' ', offsetof(struct tms, tms_utime),
12492 '\n', offsetof(struct tms, tms_stime),
12493 ' ', offsetof(struct tms, tms_cutime),
12494 '\n', offsetof(struct tms, tms_cstime),
12498 static int timescmd(int ac, char **av)
12500 long int clk_tck, s, t;
12501 const unsigned char *p;
12504 clk_tck = sysconf(_SC_CLK_TCK);
12509 t = *(clock_t *)(((char *) &buf) + p[1]);
12511 out1fmt("%ldm%ld.%.3lds%c",
12513 ((t - s * clk_tck) * 1000) / clk_tck,
12515 } while (*(p += 2));
12520 #ifdef CONFIG_ASH_MATH_SUPPORT
12522 dash_arith(const char *s)
12528 result = arith(s, &errcode);
12531 error("exponent less than 0");
12532 else if (errcode == -2)
12533 error("divide by zero");
12534 else if (errcode == -5)
12535 error("expression recursion loop detected");
12546 * The let builtin. partial stolen from GNU Bash, the Bourne Again SHell.
12547 * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.
12549 * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
12553 letcmd(int argc, char **argv)
12560 error("expression expected");
12561 for (ap = argv + 1; *ap; ap++) {
12562 i = dash_arith(*ap);
12567 #endif /* CONFIG_ASH_MATH_SUPPORT */
12569 /* $NetBSD: miscbltin.c,v 1.31 2002/11/24 22:35:41 christos Exp $ */
12572 * Miscellaneous builtins.
12578 #if __GLIBC__ == 2 && __GLIBC_MINOR__ < 1
12579 typedef enum __rlimit_resource rlim_t;
12585 * The read builtin. The -e option causes backslashes to escape the
12586 * following character.
12588 * This uses unbuffered input, which may be avoidable in some cases.
12592 readcmd(int argc, char **argv)
12604 #if defined(CONFIG_ASH_READ_NCHARS)
12608 struct termios tty, old_tty;
12610 #if defined(CONFIG_ASH_READ_TIMEOUT)
12614 ts.tv_sec = ts.tv_usec = 0;
12619 #if defined(CONFIG_ASH_READ_NCHARS) && defined(CONFIG_ASH_READ_TIMEOUT)
12620 while ((i = nextopt("p:rt:n:s")) != '\0')
12621 #elif defined(CONFIG_ASH_READ_NCHARS)
12622 while ((i = nextopt("p:rn:s")) != '\0')
12623 #elif defined(CONFIG_ASH_READ_TIMEOUT)
12624 while ((i = nextopt("p:rt:")) != '\0')
12626 while ((i = nextopt("p:r")) != '\0')
12631 prompt = optionarg;
12633 #if defined(CONFIG_ASH_READ_NCHARS)
12635 nchars = strtol(optionarg, &p, 10);
12637 error("invalid count");
12638 nch_flag = (nchars > 0);
12644 #if defined(CONFIG_ASH_READ_TIMEOUT)
12646 ts.tv_sec = strtol(optionarg, &p, 10);
12652 ts.tv_usec = strtol(p, &p2, 10);
12654 error("invalid timeout");
12656 /* normalize to usec */
12658 error("invalid timeout");
12659 while (scale++ < 6)
12663 error("invalid timeout");
12665 if ( ! ts.tv_sec && ! ts.tv_usec)
12666 error("invalid timeout");
12676 if (prompt && isatty(0)) {
12679 if (*(ap = argptr) == NULL)
12680 error("arg count");
12681 if ((ifs = bltinlookup("IFS")) == NULL)
12683 #if defined(CONFIG_ASH_READ_NCHARS)
12684 if (nch_flag || silent) {
12685 tcgetattr(0, &tty);
12688 tty.c_lflag &= ~ICANON;
12689 tty.c_cc[VMIN] = nchars;
12692 tty.c_lflag &= ~(ECHO|ECHOK|ECHONL);
12695 tcsetattr(0, TCSANOW, &tty);
12698 #if defined(CONFIG_ASH_READ_TIMEOUT)
12699 if (ts.tv_sec || ts.tv_usec) {
12703 i = select (FD_SETSIZE, &set, NULL, NULL, &ts);
12705 #if defined(CONFIG_ASH_READ_NCHARS)
12707 tcsetattr(0, TCSANOW, &old_tty);
12717 #if defined(CONFIG_ASH_READ_NCHARS)
12718 while (!nch_flag || nchars--)
12723 if (read(0, &c, 1) != 1) {
12735 if (!rflag && c == '\\') {
12741 if (startword && *ifs == ' ' && strchr(ifs, c)) {
12745 if (ap[1] != NULL && strchr(ifs, c) != NULL) {
12747 setvar(*ap, stackblock(), 0);
12756 #if defined(CONFIG_ASH_READ_NCHARS)
12757 if (nch_flag || silent)
12758 tcsetattr(0, TCSANOW, &old_tty);
12762 /* Remove trailing blanks */
12763 while ((char *)stackblock() <= --p && strchr(ifs, *p) != NULL)
12765 setvar(*ap, stackblock(), 0);
12766 while (*++ap != NULL)
12767 setvar(*ap, nullstr, 0);
12772 static int umaskcmd(int argc, char **argv)
12774 static const char permuser[3] = "ugo";
12775 static const char permmode[3] = "rwx";
12776 static const short int permmask[] = {
12777 S_IRUSR, S_IWUSR, S_IXUSR,
12778 S_IRGRP, S_IWGRP, S_IXGRP,
12779 S_IROTH, S_IWOTH, S_IXOTH
12785 int symbolic_mode = 0;
12787 while (nextopt("S") != '\0') {
12796 if ((ap = *argptr) == NULL) {
12797 if (symbolic_mode) {
12801 for (i = 0; i < 3; i++) {
12804 *p++ = permuser[i];
12806 for (j = 0; j < 3; j++) {
12807 if ((mask & permmask[3 * i + j]) == 0) {
12808 *p++ = permmode[j];
12816 out1fmt("%.4o\n", mask);
12819 if (is_digit((unsigned char) *ap)) {
12822 if (*ap >= '8' || *ap < '0')
12823 error(illnum, argv[1]);
12824 mask = (mask << 3) + (*ap - '0');
12825 } while (*++ap != '\0');
12828 mask = ~mask & 0777;
12829 if (!bb_parse_mode(ap, &mask)) {
12830 error("Illegal mode: %s", ap);
12832 umask(~mask & 0777);
12841 * This code, originally by Doug Gwyn, Doug Kingston, Eric Gisin, and
12842 * Michael Rendell was ripped from pdksh 5.0.8 and hacked for use with
12843 * ash by J.T. Conklin.
12851 int factor; /* multiply by to get rlim_{cur,max} values */
12855 static const struct limits limits[] = {
12857 { "time(seconds)", RLIMIT_CPU, 1, 't' },
12859 #ifdef RLIMIT_FSIZE
12860 { "file(blocks)", RLIMIT_FSIZE, 512, 'f' },
12863 { "data(kbytes)", RLIMIT_DATA, 1024, 'd' },
12865 #ifdef RLIMIT_STACK
12866 { "stack(kbytes)", RLIMIT_STACK, 1024, 's' },
12869 { "coredump(blocks)", RLIMIT_CORE, 512, 'c' },
12872 { "memory(kbytes)", RLIMIT_RSS, 1024, 'm' },
12874 #ifdef RLIMIT_MEMLOCK
12875 { "locked memory(kbytes)", RLIMIT_MEMLOCK, 1024, 'l' },
12877 #ifdef RLIMIT_NPROC
12878 { "process", RLIMIT_NPROC, 1, 'p' },
12880 #ifdef RLIMIT_NOFILE
12881 { "nofiles", RLIMIT_NOFILE, 1, 'n' },
12884 { "vmemory(kbytes)", RLIMIT_AS, 1024, 'v' },
12886 #ifdef RLIMIT_LOCKS
12887 { "locks", RLIMIT_LOCKS, 1, 'w' },
12889 { (char *) 0, 0, 0, '\0' }
12892 enum limtype { SOFT = 0x1, HARD = 0x2 };
12894 static void printlim(enum limtype how, const struct rlimit *limit,
12895 const struct limits *l)
12899 val = limit->rlim_max;
12901 val = limit->rlim_cur;
12903 if (val == RLIM_INFINITY)
12904 out1fmt("unlimited\n");
12907 out1fmt("%lld\n", (long long) val);
12912 ulimitcmd(int argc, char **argv)
12916 enum limtype how = SOFT | HARD;
12917 const struct limits *l;
12920 struct rlimit limit;
12923 while ((optc = nextopt("HSa"
12927 #ifdef RLIMIT_FSIZE
12933 #ifdef RLIMIT_STACK
12942 #ifdef RLIMIT_MEMLOCK
12945 #ifdef RLIMIT_NPROC
12948 #ifdef RLIMIT_NOFILE
12954 #ifdef RLIMIT_LOCKS
12972 for (l = limits; l->option != what; l++)
12975 set = *argptr ? 1 : 0;
12979 if (all || argptr[1])
12980 error("too many arguments");
12981 if (strncmp(p, "unlimited\n", 9) == 0)
12982 val = RLIM_INFINITY;
12986 while ((c = *p++) >= '0' && c <= '9')
12988 val = (val * 10) + (long)(c - '0');
12989 if (val < (rlim_t) 0)
12993 error("bad number");
12998 for (l = limits; l->name; l++) {
12999 getrlimit(l->cmd, &limit);
13000 out1fmt("%-20s ", l->name);
13001 printlim(how, &limit, l);
13006 getrlimit(l->cmd, &limit);
13009 limit.rlim_max = val;
13011 limit.rlim_cur = val;
13012 if (setrlimit(l->cmd, &limit) < 0)
13013 error("error setting limit (%m)");
13015 printlim(how, &limit, l);
13021 #ifdef CONFIG_ASH_MATH_SUPPORT
13023 /* Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
13025 Permission is hereby granted, free of charge, to any person obtaining
13026 a copy of this software and associated documentation files (the
13027 "Software"), to deal in the Software without restriction, including
13028 without limitation the rights to use, copy, modify, merge, publish,
13029 distribute, sublicense, and/or sell copies of the Software, and to
13030 permit persons to whom the Software is furnished to do so, subject to
13031 the following conditions:
13033 The above copyright notice and this permission notice shall be
13034 included in all copies or substantial portions of the Software.
13036 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
13037 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
13038 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
13039 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
13040 CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
13041 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
13042 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
13045 /* This is my infix parser/evaluator. It is optimized for size, intended
13046 * as a replacement for yacc-based parsers. However, it may well be faster
13047 * than a comparable parser written in yacc. The supported operators are
13048 * listed in #defines below. Parens, order of operations, and error handling
13049 * are supported. This code is thread safe. The exact expression format should
13050 * be that which POSIX specifies for shells. */
13052 /* The code uses a simple two-stack algorithm. See
13053 * http://www.onthenet.com.au/~grahamis/int2008/week02/lect02.html
13054 * for a detailed explanation of the infix-to-postfix algorithm on which
13055 * this is based (this code differs in that it applies operators immediately
13056 * to the stack instead of adding them to a queue to end up with an
13059 /* To use the routine, call it with an expression string and error return
13063 * Aug 24, 2001 Manuel Novoa III
13065 * Reduced the generated code size by about 30% (i386) and fixed several bugs.
13067 * 1) In arith_apply():
13068 * a) Cached values of *numptr and &(numptr[-1]).
13069 * b) Removed redundant test for zero denominator.
13072 * a) Eliminated redundant code for processing operator tokens by moving
13073 * to a table-based implementation. Also folded handling of parens
13075 * b) Combined all 3 loops which called arith_apply to reduce generated
13076 * code size at the cost of speed.
13078 * 3) The following expressions were treated as valid by the original code:
13079 * 1() , 0! , 1 ( *3 ) .
13080 * These bugs have been fixed by internally enclosing the expression in
13081 * parens and then checking that all binary ops and right parens are
13082 * preceded by a valid expression (NUM_TOKEN).
13084 * Note: It may be desirable to replace Aaron's test for whitespace with
13085 * ctype's isspace() if it is used by another busybox applet or if additional
13086 * whitespace chars should be considered. Look below the "#include"s for a
13087 * precompiler test.
13091 * Aug 26, 2001 Manuel Novoa III
13093 * Return 0 for null expressions. Pointed out by Vladimir Oleynik.
13095 * Merge in Aaron's comments previously posted to the busybox list,
13096 * modified slightly to take account of my changes to the code.
13101 * (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
13103 * - allow access to variable,
13104 * used recursive find value indirection (c=2*2; a="c"; $((a+=2)) produce 6)
13105 * - realize assign syntax (VAR=expr, +=, *= etc)
13106 * - realize exponentiation (** operator)
13107 * - realize comma separated - expr, expr
13108 * - realise ++expr --expr expr++ expr--
13109 * - realise expr ? expr : expr (but, second expr calculate always)
13110 * - allow hexadecimal and octal numbers
13111 * - was restored loses XOR operator
13112 * - remove one goto label, added three ;-)
13113 * - protect $((num num)) as true zero expr (Manuel`s error)
13114 * - always use special isspace(), see comment from bash ;-)
13118 #define arith_isspace(arithval) \
13119 (arithval == ' ' || arithval == '\n' || arithval == '\t')
13122 typedef unsigned char operator;
13124 /* An operator's token id is a bit of a bitfield. The lower 5 bits are the
13125 * precedence, and 3 high bits are an ID unique across operators of that
13126 * precedence. The ID portion is so that multiple operators can have the
13127 * same precedence, ensuring that the leftmost one is evaluated first.
13128 * Consider * and /. */
13130 #define tok_decl(prec,id) (((id)<<5)|(prec))
13131 #define PREC(op) ((op) & 0x1F)
13133 #define TOK_LPAREN tok_decl(0,0)
13135 #define TOK_COMMA tok_decl(1,0)
13137 #define TOK_ASSIGN tok_decl(2,0)
13138 #define TOK_AND_ASSIGN tok_decl(2,1)
13139 #define TOK_OR_ASSIGN tok_decl(2,2)
13140 #define TOK_XOR_ASSIGN tok_decl(2,3)
13141 #define TOK_PLUS_ASSIGN tok_decl(2,4)
13142 #define TOK_MINUS_ASSIGN tok_decl(2,5)
13143 #define TOK_LSHIFT_ASSIGN tok_decl(2,6)
13144 #define TOK_RSHIFT_ASSIGN tok_decl(2,7)
13146 #define TOK_MUL_ASSIGN tok_decl(3,0)
13147 #define TOK_DIV_ASSIGN tok_decl(3,1)
13148 #define TOK_REM_ASSIGN tok_decl(3,2)
13150 /* all assign is right associativity and precedence eq, but (7+3)<<5 > 256 */
13151 #define convert_prec_is_assing(prec) do { if(prec == 3) prec = 2; } while(0)
13153 /* conditional is right associativity too */
13154 #define TOK_CONDITIONAL tok_decl(4,0)
13155 #define TOK_CONDITIONAL_SEP tok_decl(4,1)
13157 #define TOK_OR tok_decl(5,0)
13159 #define TOK_AND tok_decl(6,0)
13161 #define TOK_BOR tok_decl(7,0)
13163 #define TOK_BXOR tok_decl(8,0)
13165 #define TOK_BAND tok_decl(9,0)
13167 #define TOK_EQ tok_decl(10,0)
13168 #define TOK_NE tok_decl(10,1)
13170 #define TOK_LT tok_decl(11,0)
13171 #define TOK_GT tok_decl(11,1)
13172 #define TOK_GE tok_decl(11,2)
13173 #define TOK_LE tok_decl(11,3)
13175 #define TOK_LSHIFT tok_decl(12,0)
13176 #define TOK_RSHIFT tok_decl(12,1)
13178 #define TOK_ADD tok_decl(13,0)
13179 #define TOK_SUB tok_decl(13,1)
13181 #define TOK_MUL tok_decl(14,0)
13182 #define TOK_DIV tok_decl(14,1)
13183 #define TOK_REM tok_decl(14,2)
13185 /* exponent is right associativity */
13186 #define TOK_EXPONENT tok_decl(15,1)
13188 /* For now unary operators. */
13189 #define UNARYPREC 16
13190 #define TOK_BNOT tok_decl(UNARYPREC,0)
13191 #define TOK_NOT tok_decl(UNARYPREC,1)
13193 #define TOK_UMINUS tok_decl(UNARYPREC+1,0)
13194 #define TOK_UPLUS tok_decl(UNARYPREC+1,1)
13196 #define PREC_PRE (UNARYPREC+2)
13198 #define TOK_PRE_INC tok_decl(PREC_PRE, 0)
13199 #define TOK_PRE_DEC tok_decl(PREC_PRE, 1)
13201 #define PREC_POST (UNARYPREC+3)
13203 #define TOK_POST_INC tok_decl(PREC_POST, 0)
13204 #define TOK_POST_DEC tok_decl(PREC_POST, 1)
13206 #define SPEC_PREC (UNARYPREC+4)
13208 #define TOK_NUM tok_decl(SPEC_PREC, 0)
13209 #define TOK_RPAREN tok_decl(SPEC_PREC, 1)
13211 #define NUMPTR (*numstackptr)
13213 static inline int tok_have_assign(operator op)
13215 operator prec = PREC(op);
13217 convert_prec_is_assing(prec);
13218 return (prec == PREC(TOK_ASSIGN) ||
13219 prec == PREC_PRE || prec == PREC_POST);
13222 static inline int is_right_associativity(operator prec)
13224 return (prec == PREC(TOK_ASSIGN) || prec == PREC(TOK_EXPONENT) ||
13225 prec == PREC(TOK_CONDITIONAL));
13229 typedef struct ARITCH_VAR_NUM {
13231 arith_t contidional_second_val;
13232 char contidional_second_val_initialized;
13233 char *var; /* if NULL then is regular number,
13234 else is variable name */
13238 typedef struct CHK_VAR_RECURSIVE_LOOPED {
13240 struct CHK_VAR_RECURSIVE_LOOPED *next;
13241 } chk_var_recursive_looped_t;
13243 static chk_var_recursive_looped_t *prev_chk_var_recursive;
13246 static int arith_lookup_val(v_n_t *t)
13249 const char * p = lookupvar(t->var);
13254 /* recursive try as expression */
13255 chk_var_recursive_looped_t *cur;
13256 chk_var_recursive_looped_t cur_save;
13258 for(cur = prev_chk_var_recursive; cur; cur = cur->next) {
13259 if(strcmp(cur->var, t->var) == 0) {
13260 /* expression recursion loop detected */
13264 /* save current lookuped var name */
13265 cur = prev_chk_var_recursive;
13266 cur_save.var = t->var;
13267 cur_save.next = cur;
13268 prev_chk_var_recursive = &cur_save;
13270 t->val = arith (p, &errcode);
13271 /* restore previous ptr after recursiving */
13272 prev_chk_var_recursive = cur;
13275 /* allow undefined var as 0 */
13282 /* "applying" a token means performing it on the top elements on the integer
13283 * stack. For a unary operator it will only change the top element, but a
13284 * binary operator will pop two arguments and push a result */
13286 arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr)
13289 arith_t numptr_val, rez;
13290 int ret_arith_lookup_val;
13292 if (NUMPTR == numstack) goto err; /* There is no operator that can work
13293 without arguments */
13294 numptr_m1 = NUMPTR - 1;
13296 /* check operand is var with noninteger value */
13297 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
13298 if(ret_arith_lookup_val)
13299 return ret_arith_lookup_val;
13301 rez = numptr_m1->val;
13302 if (op == TOK_UMINUS)
13304 else if (op == TOK_NOT)
13306 else if (op == TOK_BNOT)
13308 else if (op == TOK_POST_INC || op == TOK_PRE_INC)
13310 else if (op == TOK_POST_DEC || op == TOK_PRE_DEC)
13312 else if (op != TOK_UPLUS) {
13313 /* Binary operators */
13315 /* check and binary operators need two arguments */
13316 if (numptr_m1 == numstack) goto err;
13318 /* ... and they pop one */
13321 if (op == TOK_CONDITIONAL) {
13322 if(! numptr_m1->contidional_second_val_initialized) {
13323 /* protect $((expr1 ? expr2)) without ": expr" */
13326 rez = numptr_m1->contidional_second_val;
13327 } else if(numptr_m1->contidional_second_val_initialized) {
13328 /* protect $((expr1 : expr2)) without "expr ? " */
13331 numptr_m1 = NUMPTR - 1;
13332 if(op != TOK_ASSIGN) {
13333 /* check operand is var with noninteger value for not '=' */
13334 ret_arith_lookup_val = arith_lookup_val(numptr_m1);
13335 if(ret_arith_lookup_val)
13336 return ret_arith_lookup_val;
13338 if (op == TOK_CONDITIONAL) {
13339 numptr_m1->contidional_second_val = rez;
13341 rez = numptr_m1->val;
13342 if (op == TOK_BOR || op == TOK_OR_ASSIGN)
13344 else if (op == TOK_OR)
13345 rez = numptr_val || rez;
13346 else if (op == TOK_BAND || op == TOK_AND_ASSIGN)
13348 else if (op == TOK_BXOR || op == TOK_XOR_ASSIGN)
13350 else if (op == TOK_AND)
13351 rez = rez && numptr_val;
13352 else if (op == TOK_EQ)
13353 rez = (rez == numptr_val);
13354 else if (op == TOK_NE)
13355 rez = (rez != numptr_val);
13356 else if (op == TOK_GE)
13357 rez = (rez >= numptr_val);
13358 else if (op == TOK_RSHIFT || op == TOK_RSHIFT_ASSIGN)
13359 rez >>= numptr_val;
13360 else if (op == TOK_LSHIFT || op == TOK_LSHIFT_ASSIGN)
13361 rez <<= numptr_val;
13362 else if (op == TOK_GT)
13363 rez = (rez > numptr_val);
13364 else if (op == TOK_LT)
13365 rez = (rez < numptr_val);
13366 else if (op == TOK_LE)
13367 rez = (rez <= numptr_val);
13368 else if (op == TOK_MUL || op == TOK_MUL_ASSIGN)
13370 else if (op == TOK_ADD || op == TOK_PLUS_ASSIGN)
13372 else if (op == TOK_SUB || op == TOK_MINUS_ASSIGN)
13374 else if (op == TOK_ASSIGN || op == TOK_COMMA)
13376 else if (op == TOK_CONDITIONAL_SEP) {
13377 if (numptr_m1 == numstack) {
13378 /* protect $((expr : expr)) without "expr ? " */
13381 numptr_m1->contidional_second_val_initialized = op;
13382 numptr_m1->contidional_second_val = numptr_val;
13384 else if (op == TOK_CONDITIONAL) {
13386 numptr_val : numptr_m1->contidional_second_val;
13388 else if(op == TOK_EXPONENT) {
13390 return -3; /* exponent less than 0 */
13395 while(numptr_val--)
13400 else if(numptr_val==0) /* zero divisor check */
13402 else if (op == TOK_DIV || op == TOK_DIV_ASSIGN)
13404 else if (op == TOK_REM || op == TOK_REM_ASSIGN)
13407 if(tok_have_assign(op)) {
13410 if(numptr_m1->var == NULL) {
13414 /* save to shell variable */
13415 #ifdef CONFIG_ASH_MATH_SUPPORT_64
13416 snprintf(buf, sizeof(buf), "%lld", rez);
13418 snprintf(buf, sizeof(buf), "%ld", rez);
13420 setvar(numptr_m1->var, buf, 0);
13421 /* after saving, make previous value for v++ or v-- */
13422 if(op == TOK_POST_INC)
13424 else if(op == TOK_POST_DEC)
13427 numptr_m1->val = rez;
13428 /* protect geting var value, is number now */
13429 numptr_m1->var = NULL;
13434 /* longest must first */
13435 static const char op_tokens[] = {
13436 '<','<','=',0, TOK_LSHIFT_ASSIGN,
13437 '>','>','=',0, TOK_RSHIFT_ASSIGN,
13438 '<','<', 0, TOK_LSHIFT,
13439 '>','>', 0, TOK_RSHIFT,
13440 '|','|', 0, TOK_OR,
13441 '&','&', 0, TOK_AND,
13442 '!','=', 0, TOK_NE,
13443 '<','=', 0, TOK_LE,
13444 '>','=', 0, TOK_GE,
13445 '=','=', 0, TOK_EQ,
13446 '|','=', 0, TOK_OR_ASSIGN,
13447 '&','=', 0, TOK_AND_ASSIGN,
13448 '*','=', 0, TOK_MUL_ASSIGN,
13449 '/','=', 0, TOK_DIV_ASSIGN,
13450 '%','=', 0, TOK_REM_ASSIGN,
13451 '+','=', 0, TOK_PLUS_ASSIGN,
13452 '-','=', 0, TOK_MINUS_ASSIGN,
13453 '-','-', 0, TOK_POST_DEC,
13454 '^','=', 0, TOK_XOR_ASSIGN,
13455 '+','+', 0, TOK_POST_INC,
13456 '*','*', 0, TOK_EXPONENT,
13460 '=', 0, TOK_ASSIGN,
13472 '?', 0, TOK_CONDITIONAL,
13473 ':', 0, TOK_CONDITIONAL_SEP,
13474 ')', 0, TOK_RPAREN,
13475 '(', 0, TOK_LPAREN,
13479 #define endexpression &op_tokens[sizeof(op_tokens)-7]
13482 static arith_t arith (const char *expr, int *perrcode)
13484 register char arithval; /* Current character under analysis */
13485 operator lasttok, op;
13488 const char *p = endexpression;
13491 size_t datasizes = strlen(expr) + 2;
13493 /* Stack of integers */
13494 /* The proof that there can be no more than strlen(startbuf)/2+1 integers
13495 * in any given correct or incorrect expression is left as an exercise to
13497 v_n_t *numstack = alloca(((datasizes)/2)*sizeof(v_n_t)),
13498 *numstackptr = numstack;
13499 /* Stack of operator tokens */
13500 operator *stack = alloca((datasizes) * sizeof(operator)),
13503 *stackptr++ = lasttok = TOK_LPAREN; /* start off with a left paren */
13504 *perrcode = errcode = 0;
13507 if ((arithval = *expr) == 0) {
13508 if (p == endexpression) {
13509 /* Null expression. */
13513 /* This is only reached after all tokens have been extracted from the
13514 * input stream. If there are still tokens on the operator stack, they
13515 * are to be applied in order. At the end, there should be a final
13516 * result on the integer stack */
13518 if (expr != endexpression + 1) {
13519 /* If we haven't done so already, */
13520 /* append a closing right paren */
13521 expr = endexpression;
13522 /* and let the loop process it. */
13525 /* At this point, we're done with the expression. */
13526 if (numstackptr != numstack+1) {
13527 /* ... but if there isn't, it's bad */
13529 return (*perrcode = -1);
13531 if(numstack->var) {
13532 /* expression is $((var)) only, lookup now */
13533 errcode = arith_lookup_val(numstack);
13536 *perrcode = errcode;
13537 return numstack->val;
13539 /* Continue processing the expression. */
13540 if (arith_isspace(arithval)) {
13541 /* Skip whitespace */
13544 if((p = endofname(expr)) != expr) {
13545 size_t var_name_size = (p-expr) + 1; /* trailing zero */
13547 numstackptr->var = alloca(var_name_size);
13548 safe_strncpy(numstackptr->var, expr, var_name_size);
13551 numstackptr->contidional_second_val_initialized = 0;
13555 } else if (is_digit(arithval)) {
13556 numstackptr->var = NULL;
13557 #ifdef CONFIG_ASH_MATH_SUPPORT_64
13558 numstackptr->val = strtoll(expr, (char **) &expr, 0);
13560 numstackptr->val = strtol(expr, (char **) &expr, 0);
13564 for(p = op_tokens; ; p++) {
13568 /* strange operator not found */
13571 for(o = expr; *p && *o == *p; p++)
13578 /* skip tail uncompared token */
13581 /* skip zero delim */
13586 /* post grammar: a++ reduce to num */
13587 if(lasttok == TOK_POST_INC || lasttok == TOK_POST_DEC)
13590 /* Plus and minus are binary (not unary) _only_ if the last
13591 * token was as number, or a right paren (which pretends to be
13592 * a number, since it evaluates to one). Think about it.
13593 * It makes sense. */
13594 if (lasttok != TOK_NUM) {
13610 /* We don't want a unary operator to cause recursive descent on the
13611 * stack, because there can be many in a row and it could cause an
13612 * operator to be evaluated before its argument is pushed onto the
13613 * integer stack. */
13614 /* But for binary operators, "apply" everything on the operator
13615 * stack until we find an operator with a lesser priority than the
13616 * one we have just extracted. */
13617 /* Left paren is given the lowest priority so it will never be
13618 * "applied" in this way.
13619 * if associativity is right and priority eq, applied also skip
13622 if ((prec > 0 && prec < UNARYPREC) || prec == SPEC_PREC) {
13623 /* not left paren or unary */
13624 if (lasttok != TOK_NUM) {
13625 /* binary op must be preceded by a num */
13628 while (stackptr != stack) {
13629 if (op == TOK_RPAREN) {
13630 /* The algorithm employed here is simple: while we don't
13631 * hit an open paren nor the bottom of the stack, pop
13632 * tokens and apply them */
13633 if (stackptr[-1] == TOK_LPAREN) {
13635 /* Any operator directly after a */
13637 /* close paren should consider itself binary */
13641 operator prev_prec = PREC(stackptr[-1]);
13643 convert_prec_is_assing(prec);
13644 convert_prec_is_assing(prev_prec);
13645 if (prev_prec < prec)
13647 /* check right assoc */
13648 if(prev_prec == prec && is_right_associativity(prec))
13651 errcode = arith_apply(*--stackptr, numstack, &numstackptr);
13652 if(errcode) goto ret;
13654 if (op == TOK_RPAREN) {
13659 /* Push this operator to the stack and remember it. */
13660 *stackptr++ = lasttok = op;
13667 #endif /* CONFIG_ASH_MATH_SUPPORT */
13671 const char *bb_applet_name = "debug stuff usage";
13672 int main(int argc, char **argv)
13674 return ash_main(argc, argv);
13679 * Copyright (c) 1989, 1991, 1993, 1994
13680 * The Regents of the University of California. All rights reserved.
13682 * This code is derived from software contributed to Berkeley by
13683 * Kenneth Almquist.
13685 * Redistribution and use in source and binary forms, with or without
13686 * modification, are permitted provided that the following conditions
13688 * 1. Redistributions of source code must retain the above copyright
13689 * notice, this list of conditions and the following disclaimer.
13690 * 2. Redistributions in binary form must reproduce the above copyright
13691 * notice, this list of conditions and the following disclaimer in the
13692 * documentation and/or other materials provided with the distribution.
13694 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
13695 * ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
13697 * 4. Neither the name of the University nor the names of its contributors
13698 * may be used to endorse or promote products derived from this software
13699 * without specific prior written permission.
13701 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
13702 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
13703 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
13704 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
13705 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
13706 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
13707 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
13708 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
13709 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
13710 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF