1 /* $Header: /src/pub/tcsh/sh.exec.c,v 3.56 2002/06/25 19:02:11 christos Exp $ */
3 * sh.exec.c: Search, find, and execute a command!
6 * Copyright (c) 1980, 1991 The Regents of the University of California.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 RCSID("$Id: sh.exec.c,v 3.56 2002/06/25 19:02:11 christos Exp $")
41 #endif /*WINNT_NATIVE*/
48 # define FASTHASH /* Fast hashing is the default */
52 * System level search and execute of a command.
53 * We look in each directory for the specified command name.
54 * If the name contains a '/' then we execute only the full path name.
55 * If there is no search path then we execute only full path names.
59 * As we search for the command we note the first non-trivial error
60 * message for presentation to the user. This allows us often
61 * to show that a file has the wrong mode/no access when the file
62 * is not in the last component of the search path, so we must
63 * go on after first detecting the error.
65 static char *exerr
; /* Execution error message */
66 static Char
*expath
; /* Path for exerr */
69 * The two part hash function is designed to let texec() call the
70 * more expensive hashname() only once and the simple hash() several
71 * times (once for each path component checked).
72 * Byte size is assumed to be 8.
74 #define BITS_PER_BYTE 8
78 * xhash is an array of hash buckets which are used to hash execs. If
79 * it is allocated (havhash true), then to tell if ``name'' is
80 * (possibly) presend in the i'th component of the variable path, look
81 * at the [hashname(name)] bucket of size [hashwidth] bytes, in the [i
82 * mod size*8]'th bit. The cache size is defaults to a length of 1024
83 * buckets, each 1 byte wide. This implementation guarantees that
84 * objects n bytes wide will be aligned on n byte boundaries.
88 static unsigned long *xhash
= NULL
;
89 static unsigned int hashlength
= 0, uhashlength
= 0;
90 static unsigned int hashwidth
= 0, uhashwidth
= 0;
91 static int hashdebug
= 0;
93 # define hash(a, b) (((a) * HSHMUL + (b)) % (hashlength))
94 # define widthof(t) (sizeof(t) * BITS_PER_BYTE)
95 # define tbit(f, i, t) (((t *) xhash)[(f)] & \
96 (1L << (i & (widthof(t) - 1))))
97 # define tbis(f, i, t) (((t *) xhash)[(f)] |= \
98 (1L << (i & (widthof(t) - 1))))
99 # define cbit(f, i) tbit(f, i, unsigned char)
100 # define cbis(f, i) tbis(f, i, unsigned char)
101 # define sbit(f, i) tbit(f, i, unsigned short)
102 # define sbis(f, i) tbis(f, i, unsigned short)
103 # define ibit(f, i) tbit(f, i, unsigned int)
104 # define ibis(f, i) tbis(f, i, unsigned int)
105 # define lbit(f, i) tbit(f, i, unsigned long)
106 # define lbis(f, i) tbis(f, i, unsigned long)
108 # define bit(f, i) (hashwidth==sizeof(unsigned char) ? cbit(f,i) : \
109 ((hashwidth==sizeof(unsigned short) ? sbit(f,i) : \
110 ((hashwidth==sizeof(unsigned int) ? ibit(f,i) : \
112 # define bis(f, i) (hashwidth==sizeof(unsigned char) ? cbis(f,i) : \
113 ((hashwidth==sizeof(unsigned short) ? sbis(f,i) : \
114 ((hashwidth==sizeof(unsigned int) ? ibis(f,i) : \
118 * Xhash is an array of HSHSIZ bits (HSHSIZ / 8 chars), which are used
119 * to hash execs. If it is allocated (havhash true), then to tell
120 * whether ``name'' is (possibly) present in the i'th component
121 * of the variable path, you look at the bit in xhash indexed by
122 * hash(hashname("name"), i). This is setup automatically
123 * after .login is executed, and recomputed whenever ``path'' is
126 # define HSHSIZ 8192 /* 1k bytes */
127 # define HSHMASK (HSHSIZ - 1)
129 static char xhash
[HSHSIZ
/ BITS_PER_BYTE
];
131 # define hash(a, b) (((a) * HSHMUL + (b)) & HSHMASK)
132 # define bit(h, b) ((h)[(b) >> 3] & 1 << ((b) & 7)) /* bit test */
133 # define bis(h, b) ((h)[(b) >> 3] |= 1 << ((b) & 7)) /* bit set */
135 #endif /* FASTHASH */
138 static int hits
, misses
;
141 /* Dummy search path for just absolute search when no path */
142 static Char
*justabs
[] = {STRNULL
, 0};
144 static void pexerr
__P((void));
145 static void texec
__P((Char
*, Char
**));
146 int hashname
__P((Char
*));
147 static int iscommand
__P((Char
*));
151 register struct command
*t
;
154 Char
*dp
, **pv
, **av
, *sav
;
161 * Glob the command name. We will search $path even if this does something,
162 * as in sh but not in csh. One special case: if there is no PATH, then we
163 * execute only commands which start with '/'.
165 blk
[0] = t
->t_dcom
[0];
173 setname(short2str(blk
[0]));
174 stderror(ERR_NAME
| ERR_NOMATCH
);
184 expath
= Strsave(pv
[0]);
190 if (v
== 0 && expath
[0] != '/' && expath
[0] != '.') {
194 slash
= any(short2str(expath
), '/');
197 * Glob the argument list, if necessary. Otherwise trim off the quote bits.
207 setname(short2str(expath
));
208 stderror(ERR_NAME
| ERR_NOMATCH
);
216 t
->t_dcom
= blkspl(pv
, av
);
222 if (*av
== NULL
|| **av
== '\0')
225 xechoit(av
); /* Echo command if -x */
228 * Since all internal file descriptors are set to close on exec, we don't
229 * need to close them explicitly here. Just reorient ourselves for error
236 isoutatty
= isatty(SHOUT
);
237 isdiagatty
= isatty(SHDIAG
);
239 closech(); /* Close random fd's */
242 * We must do this AFTER any possible forking (like `foo` in glob) so that
243 * this shell can still do subprocesses.
246 (void) sigsetmask((sigmask_t
) 0);
248 (void) sigrelse(SIGINT
);
249 (void) sigrelse(SIGCHLD
);
253 * If no path, no words in path, or a / in the filename then restrict the
256 if (v
== NULL
|| v
->vec
== NULL
|| v
->vec
[0] == NULL
|| slash
)
260 sav
= Strspl(STRslash
, *av
);/* / command name for postpending */
264 hashval
= havhash
? hashname(*av
) : 0;
272 * Try to save time by looking at the hash table for where this command
273 * could be. If we are doing delayed hashing, then we put the names in
274 * one at a time, as the user enters them. This is kinda like Korn
275 * Shell's "tracked aliases".
277 if (!slash
&& ABSOLUTEP(pv
[0]) && havhash
) {
279 if (!bit(hashval
, i
))
282 int hashval1
= hash(hashval
, i
);
283 if (!bit(xhash
, hashval1
))
285 #endif /* FASTHASH */
287 if (pv
[0][0] == 0 || eq(pv
[0], STRdot
)) /* don't make ./xxx */
291 if (t
->t_dflg
& F_AMPERSAND
) {
293 xprintf("set SIGINT to SIG_IGN\n");
294 xprintf("set SIGQUIT to SIG_DFL\n");
295 # endif /* JOBDEBUG */
296 (void) signal(SIGINT
,SIG_IGN
); /* may not be necessary */
297 (void) signal(SIGQUIT
,SIG_DFL
);
300 if (gointr
&& eq(gointr
, STRminus
)) {
302 xprintf("set SIGINT to SIG_IGN\n");
303 xprintf("set SIGQUIT to SIG_IGN\n");
304 # endif /* JOBDEBUG */
305 (void) signal(SIGINT
,SIG_IGN
); /* may not be necessary */
306 (void) signal(SIGQUIT
,SIG_IGN
);
308 #endif /* COHERENT */
313 dp
= Strspl(*pv
, sav
);
319 if ((t
->t_dflg
& F_AMPERSAND
)) {
321 xprintf("set SIGINT to SIG_IGN\n");
322 # endif /* JOBDEBUG */
324 * this is necessary on Coherent or all background
325 * jobs are killed by CTRL-C
326 * (there must be a better fix for this)
328 (void) signal(SIGINT
,SIG_IGN
);
330 if (gointr
&& eq(gointr
,STRminus
)) {
332 xprintf("set SIGINT to SIG_IGN\n");
333 xprintf("set SIGQUIT to SIG_IGN\n");
334 # endif /* JOBDEBUG */
335 (void) signal(SIGINT
,SIG_IGN
); /* may not be necessary */
336 (void) signal(SIGQUIT
,SIG_IGN
);
338 #endif /* COHERENT */
364 /* Couldn't find the damn thing */
366 setname(short2str(expath
));
370 xfree((ptr_t
) expath
);
376 stderror(ERR_NAME
| ERR_STRING
, exerr
);
377 stderror(ERR_NAME
| ERR_COMMAND
);
381 * Execute command f, arg list t.
382 * Record error message if not found.
383 * Also do shell scripts here.
392 register struct varent
*v
;
399 /* The order for the conversions is significant */
405 errno
= 0; /* don't use a previous error */
408 * If we try to execute an nfs mounted directory on the apollo, we
409 * hang forever. So until apollo fixes that..
413 if (stat(f
, &stb
) == 0 && S_ISDIR(stb
.st_mode
))
419 #ifdef ISC_POSIX_EXEC_BUG
420 __setostype(0); /* "0" is "__OS_SYSV" in <sys/user.h> */
421 #endif /* ISC_POSIX_EXEC_BUG */
423 #ifdef ISC_POSIX_EXEC_BUG
424 __setostype(1); /* "1" is "__OS_POSIX" in <sys/user.h> */
425 #endif /* ISC_POSIX_EXEC_BUG */
430 blkfree((Char
**) t
);
436 #endif /* WINNT_NATIVE */
438 * From: casper@fwi.uva.nl (Casper H.S. Dik) If we could not execute
439 * it, don't feed it to the shell if it looks like a binary!
441 if ((fd
= open(f
, O_RDONLY
)) != -1) {
443 if ((nread
= read(fd
, (char *) pref
, 2)) == 2) {
444 if (!Isprint(pref
[0]) && (pref
[0] != '\n' && pref
[0] != '\t')) {
447 * We *know* what ENOEXEC means.
449 stderror(ERR_ARCH
, f
, strerror(errno
));
452 else if (nread
< 0 && errno
!= EINTR
) {
454 /* need to print error incase the file is migrated */
455 stderror(ERR_SYSTEM
, f
, strerror(errno
));
467 pref
[0] != '#' || pref
[1] != '!' || hashbang(fd
, &vp
) == -1) {
468 #endif /* HASHBANG */
470 * If there is an alias for shell, then put the words of the alias in
471 * front of the argument list replacing the command name. Note no
472 * interpretation of the words at this point.
474 v
= adrof1(STRshell
, &aliases
);
475 if (v
== NULL
|| v
->vec
== NULL
) {
477 vp
[0] = adrof(STRshell
) ? varval(STRshell
) : STR_SHELLPATH
;
481 # ifndef ISC /* Compatible with ISC's /bin/csh */
490 vp
= saveblk(v
->vec
);
493 #endif /* HASHBANG */
500 st
= blkspl(vp
, st
); /* Splice up the new arglst */
503 /* The order for the conversions is significant */
507 blkfree((Char
**) vp
);
511 #ifdef ISC_POSIX_EXEC_BUG
512 __setostype(0); /* "0" is "__OS_SYSV" in <sys/user.h> */
513 #endif /* ISC_POSIX_EXEC_BUG */
515 #ifdef ISC_POSIX_EXEC_BUG
516 __setostype(1); /* "1" is "__OS_POSIX" in <sys/user.h> */
517 #endif /* ISC_POSIX_EXEC_BUG */
521 blkfree((Char
**) t
);
522 /* The sky is falling, the sky is falling! */
523 stderror(ERR_SYSTEM
, f
, strerror(errno
));
527 stderror(ERR_SYSTEM
, f
, strerror(errno
));
531 case 0: /* execv fails and returns 0! */
538 exerr
= strerror(errno
);
540 xfree((ptr_t
) expath
);
541 expath
= Strsave(sf
);
554 register struct command
*kp
;
556 int saveIN
, saveOUT
, saveDIAG
, saveSTD
;
564 #ifndef CLOSE_ON_EXEC
566 #endif /* CLOSE_ON_EXEC */
567 signalfun_t osigint
, osigquit
, osigterm
;
570 if (chkstop
== 0 && setintr
)
573 * Hmm, we don't really want to do that now because we might
574 * fail, but what is the choice
576 rechist(NULL
, adrof(STRsavehist
) != NULL
);
579 osigint
= signal(SIGINT
, parintr
);
580 osigquit
= signal(SIGQUIT
, parintr
);
581 osigterm
= signal(SIGTERM
, parterm
);
584 #ifndef CLOSE_ON_EXEC
586 #endif /* CLOSE_ON_EXEC */
592 saveIN
= dcopy(SHIN
, -1);
593 saveOUT
= dcopy(SHOUT
, -1);
594 saveDIAG
= dcopy(SHDIAG
, -1);
595 saveSTD
= dcopy(OLDSTD
, -1);
597 lshift(kp
->t_dcom
, 1);
601 /* PWP: setjmp/longjmp bugfix for optimizing compilers */
603 my_reenter
= 1; /* assume non-zero return val */
604 if (setexit() == 0) {
605 my_reenter
= 0; /* Oh well, we were wrong */
607 if ((my_reenter
= setexit()) == 0) {
610 SHOUT
= dcopy(1, -1);
611 SHDIAG
= dcopy(2, -1);
612 #ifndef CLOSE_ON_EXEC
614 #endif /* CLOSE_ON_EXEC */
617 * Decrement the shell level
622 #endif /* WINNT_NATIVE */
626 (void) sigset(SIGINT
, osigint
);
627 (void) sigset(SIGQUIT
, osigquit
);
628 (void) sigset(SIGTERM
, osigterm
);
631 #ifndef CLOSE_ON_EXEC
633 #endif /* CLOSE_ON_EXEC */
637 (void) close(SHDIAG
);
638 (void) close(OLDSTD
);
639 SHIN
= dmove(saveIN
, oSHIN
);
640 SHOUT
= dmove(saveOUT
, oSHOUT
);
641 SHDIAG
= dmove(saveDIAG
, oSHDIAG
);
642 OLDSTD
= dmove(saveSTD
, oOLDSTD
);
646 stderror(ERR_SILENT
);
653 if (adrof(STRecho
)) {
654 int odidfds
= didfds
;
658 blkpr(t
), xputchar('\n');
675 register struct dirent
*dp
;
677 struct varent
*v
= adrof(STRpath
);
681 int is_windir
; /* check if it is the windows directory */
683 #endif /* WINNT_NATIVE */
688 uhashlength
= atoi(short2str(vv
[1]));
690 uhashwidth
= atoi(short2str(vv
[2]));
691 if ((uhashwidth
!= sizeof(unsigned char)) &&
692 (uhashwidth
!= sizeof(unsigned short)) &&
693 (uhashwidth
!= sizeof(unsigned long)))
696 hashdebug
= atoi(short2str(vv
[3]));
701 hashwidth
= uhashwidth
;
706 for (pv
= v
->vec
; pv
&& *pv
; pv
++, hashwidth
++)
708 if (hashwidth
<= widthof(unsigned char))
709 hashwidth
= sizeof(unsigned char);
710 else if (hashwidth
<= widthof(unsigned short))
711 hashwidth
= sizeof(unsigned short);
712 else if (hashwidth
<= widthof(unsigned int))
713 hashwidth
= sizeof(unsigned int);
715 hashwidth
= sizeof(unsigned long);
719 hashlength
= uhashlength
;
721 hashlength
= hashwidth
* (8*64);/* "average" files per dir in path */
724 xfree((ptr_t
) xhash
);
725 xhash
= (unsigned long *) xcalloc((size_t) (hashlength
* hashwidth
),
727 #endif /* FASTHASH */
729 (void) getusername(NULL
); /* flush the tilde cashe */
734 for (pv
= v
->vec
; pv
&& *pv
; pv
++, i
++) {
735 if (!ABSOLUTEP(pv
[0]))
737 dirp
= opendir(short2str(*pv
));
740 #ifdef COMMENT /* this isn't needed. opendir won't open
742 if (fstat(dirp
->dd_fd
, &stb
) < 0 || !S_ISDIR(stb
.st_mode
)) {
743 (void) closedir(dirp
);
748 is_windir
= nt_check_if_windir(short2str(*pv
));
749 #endif /* WINNT_NATIVE */
750 while ((dp
= readdir(dirp
)) != NULL
) {
753 if (dp
->d_name
[0] == '.' &&
754 (dp
->d_name
[1] == '\0' ||
755 (dp
->d_name
[1] == '.' && dp
->d_name
[2] == '\0')))
758 nt_check_name_and_hash(is_windir
, dp
->d_name
, i
);
759 #else /* !WINNT_NATIVE*/
760 #if defined(_UWIN) || defined(__CYGWIN__)
761 /* Turn foo.{exe,com,bat} into foo since UWIN's readdir returns
762 * the file with the .exe, .com, .bat extension
765 size_t ext
= strlen(dp
->d_name
) - 4;
766 if ((ext
> 0) && (strcmp(&dp
->d_name
[ext
], ".exe") == 0 ||
767 strcmp(&dp
->d_name
[ext
], ".bat") == 0 ||
768 strcmp(&dp
->d_name
[ext
], ".com") == 0))
769 dp
->d_name
[ext
] = '\0';
771 #endif /* _UWIN || __CYGWIN__ */
773 hashval
= hashname(str2short(dp
->d_name
));
776 xprintf(CGETS(13, 1, "hash=%-4d dir=%-2d prog=%s\n"),
777 hashname(str2short(dp
->d_name
)), i
, dp
->d_name
);
778 # else /* OLD HASH */
779 hashval
= hash(hashname(str2short(dp
->d_name
)), i
);
781 # endif /* FASTHASH */
782 /* tw_add_comm_name (dp->d_name); */
783 #endif /* WINNT_NATIVE */
785 (void) closedir(dirp
);
800 xfree((ptr_t
) xhash
);
803 #endif /* FASTHASH */
815 if (havhash
&& hashlength
&& hashwidth
)
816 xprintf(CGETS(13, 2, "%d hash buckets of %d bits each\n"),
817 hashlength
, hashwidth
*8);
819 xprintf(CGETS(13, 3, "debug mask = 0x%08x\n"), hashdebug
);
820 #endif /* FASTHASH */
823 xprintf(CGETS(13, 4, "%d hits, %d misses, %d%%\n"),
824 hits
, misses
, 100 * hits
/ (hits
+ misses
));
830 * Hash a command name.
836 register unsigned long h
;
838 for (h
= 0; *cp
; cp
++)
849 register struct varent
*v
;
850 register bool slash
= any(short2str(name
), '/');
851 register int hashval
, i
;
854 if (v
== NULL
|| v
->vec
== NULL
|| v
->vec
[0] == NULL
|| slash
)
858 sav
= Strspl(STRslash
, name
); /* / command name for postpending */
859 hashval
= havhash
? hashname(name
) : 0;
862 if (!slash
&& ABSOLUTEP(pv
[0]) && havhash
) {
864 if (!bit(hashval
, i
))
867 int hashval1
= hash(hashval
, i
);
868 if (!bit(xhash
, hashval1
))
870 #endif /* FASTHASH */
872 if (pv
[0][0] == 0 || eq(pv
[0], STRdot
)) { /* don't make ./xxx */
873 if (executable(NULL
, name
, 0)) {
879 if (executable(*pv
, sav
, 0)) {
893 * Andreas Luik <luik@isaak.isa.de>
894 * I S A GmbH - Informationssysteme fuer computerintegrierte Automatisierung
898 * is the executable() routine below and changes to iscommand().
904 * executable() examines the pathname obtained by concatenating dir and name
905 * (dir may be NULL), and returns 1 either if it is executable by us, or
906 * if dir_ok is set and the pathname refers to a directory.
907 * This is a bit kludgy, but in the name of optimization...
910 executable(dir
, name
, dir_ok
)
915 Char path
[MAXPATHLEN
+ 1];
917 (void) memset(path
, 0, sizeof(path
));
920 copyn(path
, dir
, MAXPATHLEN
);
921 catn(path
, name
, MAXPATHLEN
);
922 strname
= short2str(path
);
925 strname
= short2str(name
);
927 return (stat(strname
, &stbuf
) != -1 &&
928 ((dir_ok
&& S_ISDIR(stbuf
.st_mode
)) ||
929 (S_ISREG(stbuf
.st_mode
) &&
930 /* save time by not calling access() in the hopeless case */
931 (stbuf
.st_mode
& (S_IXOTH
| S_IXGRP
| S_IXUSR
)) &&
932 access(strname
, X_OK
) == 0
935 #endif /*!WINNT_NATIVE*/
938 tellmewhat(lexp
, str
)
939 struct wordent
*lexp
;
943 register struct biltins
*bptr
;
944 register struct wordent
*sp
= lexp
->next
;
945 bool aliased
= 0, found
;
946 Char
*s0
, *s1
, *s2
, *cmd
;
949 if (adrof1(sp
->word
, &aliases
)) {
955 s0
= sp
->word
; /* to get the memory freeing right... */
957 /* handle quoted alias hack */
958 if ((*(sp
->word
) & (QUOTE
| TRIM
)) == QUOTE
)
961 /* do quoting, if it hasn't been done */
968 while (*s2
&& *s2
!= qc
)
969 *s1
++ = *s2
++ | QUOTE
;
975 *s1
++ = *s2
++ | QUOTE
;
982 for (bptr
= bfunc
; bptr
< &bfunc
[nbfunc
]; bptr
++) {
983 if (eq(sp
->word
, str2short(bptr
->bname
))) {
987 xprintf(CGETS(13, 5, "%S: shell built-in command.\n"),
992 (void) Strcpy(str
, sp
->word
);
993 sp
->word
= s0
; /* we save and then restore this */
998 for (bptr
= nt_bfunc
; bptr
< &nt_bfunc
[nt_nbfunc
]; bptr
++) {
999 if (eq(sp
->word
, str2short(bptr
->bname
))) {
1003 xprintf(CGETS(13, 5, "%S: shell built-in command.\n"),
1008 (void) Strcpy(str
, sp
->word
);
1009 sp
->word
= s0
; /* we save and then restore this */
1013 #endif /* WINNT_NATIVE*/
1015 sp
->word
= cmd
= globone(sp
->word
, G_IGNORE
);
1017 if ((i
= iscommand(sp
->word
)) != 0) {
1019 register struct varent
*v
;
1020 bool slash
= any(short2str(sp
->word
), '/');
1023 if (v
== NULL
|| v
->vec
== NULL
|| v
->vec
[0] == NULL
|| slash
)
1030 if (pv
[0][0] == 0 || eq(pv
[0], STRdot
)) {
1032 sp
->word
= Strspl(STRdotsl
, sp
->word
);
1034 xfree((ptr_t
) sp
->word
);
1040 s1
= Strspl(*pv
, STRslash
);
1041 sp
->word
= Strspl(s1
, sp
->word
);
1046 (void) Strcpy(str
, sp
->word
);
1047 xfree((ptr_t
) sp
->word
);
1055 xprintf(CGETS(13, 6, "%S: Command not found.\n"), sp
->word
);
1059 (void) Strcpy(str
, sp
->word
);
1062 sp
->word
= s0
; /* we save and then restore this */
1068 * Builtin to look at and list all places a command may be defined:
1069 * aliases, shell builtins, and the path.
1071 * Marc Horowitz <marc@mit.edu>
1072 * MIT Student Information Processing Board
1084 found
&= find_cmd(*v
, 1);
1085 /* Make status nonzero if any command is not found. */
1087 set(STRstatus
, Strsave(STR1
), VAR_READWRITE
);
1096 struct biltins
*bptr
;
1099 int hashval
, i
, ex
, rval
= 0;
1101 if (prt
&& any(short2str(cmd
), '/')) {
1102 xprintf(CGETS(13, 7, "where: / in command makes no sense\n"));
1106 /* first, look for an alias */
1108 if (prt
&& adrof1(cmd
, &aliases
)) {
1109 if ((var
= adrof1(cmd
, &aliases
)) != NULL
) {
1110 xprintf(CGETS(13, 8, "%S is aliased to "), cmd
);
1111 if (var
->vec
!= NULL
)
1118 /* next, look for a shell builtin */
1120 for (bptr
= bfunc
; bptr
< &bfunc
[nbfunc
]; bptr
++) {
1121 if (eq(cmd
, str2short(bptr
->bname
))) {
1124 xprintf(CGETS(13, 9, "%S is a shell built-in\n"), cmd
);
1130 for (bptr
= nt_bfunc
; bptr
< &nt_bfunc
[nt_nbfunc
]; bptr
++) {
1131 if (eq(cmd
, str2short(bptr
->bname
))) {
1134 xprintf(CGETS(13, 9, "%S is a shell built-in\n"), cmd
);
1139 #endif /* WINNT_NATIVE*/
1141 /* last, look through the path for the command */
1143 if ((var
= adrof(STRpath
)) == NULL
)
1146 hashval
= havhash
? hashname(cmd
) : 0;
1148 sv
= Strspl(STRslash
, cmd
);
1150 for (pv
= var
->vec
, i
= 0; pv
&& *pv
; pv
++, i
++) {
1151 if (havhash
&& !eq(*pv
, STRdot
)) {
1153 if (!bit(hashval
, i
))
1156 int hashval1
= hash(hashval
, i
);
1157 if (!bit(xhash
, hashval1
))
1159 #endif /* FASTHASH */
1161 ex
= executable(*pv
, sv
, 0);
1163 if (!ex
&& (hashdebug
& 2)) {
1164 xprintf(CGETS(13, 10, "hash miss: "));
1165 ex
= 1; /* Force printing */
1167 #endif /* FASTHASH */
1171 xprintf("%S/", *pv
);
1172 xprintf("%S\n", cmd
);
1182 int hashval_extern(cp
)
1185 return havhash
?hashname(cp
):0;
1187 int bit_extern(val
,i
)
1193 void bis_extern(val
,i
)
1199 #endif /* WINNT_NATIVE */