exec.c revision 204800 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#ifndef lint
34#if 0
35static char sccsid[] = "@(#)exec.c	8.4 (Berkeley) 6/8/95";
36#endif
37#endif /* not lint */
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/bin/sh/exec.c 204800 2010-03-06 16:57:53Z jilles $");
40
41#include <sys/types.h>
42#include <sys/stat.h>
43#include <unistd.h>
44#include <fcntl.h>
45#include <errno.h>
46#include <stdlib.h>
47
48/*
49 * When commands are first encountered, they are entered in a hash table.
50 * This ensures that a full path search will not have to be done for them
51 * on each invocation.
52 *
53 * We should investigate converting to a linear search, even though that
54 * would make the command name "hash" a misnomer.
55 */
56
57#include "shell.h"
58#include "main.h"
59#include "nodes.h"
60#include "parser.h"
61#include "redir.h"
62#include "eval.h"
63#include "exec.h"
64#include "builtins.h"
65#include "var.h"
66#include "options.h"
67#include "input.h"
68#include "output.h"
69#include "syntax.h"
70#include "memalloc.h"
71#include "error.h"
72#include "init.h"
73#include "mystring.h"
74#include "show.h"
75#include "jobs.h"
76#include "alias.h"
77
78
79#define CMDTABLESIZE 31		/* should be prime */
80#define ARB 1			/* actual size determined at run time */
81
82
83
84struct tblentry {
85	struct tblentry *next;	/* next entry in hash chain */
86	union param param;	/* definition of builtin function */
87	int special;		/* flag for special builtin commands */
88	short cmdtype;		/* index identifying command */
89	char rehash;		/* if set, cd done since entry created */
90	char cmdname[ARB];	/* name of command */
91};
92
93
94STATIC struct tblentry *cmdtable[CMDTABLESIZE];
95STATIC int builtinloc = -1;		/* index in path of %builtin, or -1 */
96int exerrno = 0;			/* Last exec error */
97
98
99STATIC void tryexec(char *, char **, char **);
100STATIC void printentry(struct tblentry *, int);
101STATIC struct tblentry *cmdlookup(const char *, int);
102STATIC void delete_cmd_entry(void);
103
104
105
106/*
107 * Exec a program.  Never returns.  If you change this routine, you may
108 * have to change the find_command routine as well.
109 */
110
111void
112shellexec(char **argv, char **envp, const char *path, int idx)
113{
114	char *cmdname;
115	int e;
116
117	if (strchr(argv[0], '/') != NULL) {
118		tryexec(argv[0], argv, envp);
119		e = errno;
120	} else {
121		e = ENOENT;
122		while ((cmdname = padvance(&path, argv[0])) != NULL) {
123			if (--idx < 0 && pathopt == NULL) {
124				tryexec(cmdname, argv, envp);
125				if (errno != ENOENT && errno != ENOTDIR)
126					e = errno;
127			}
128			stunalloc(cmdname);
129		}
130	}
131
132	/* Map to POSIX errors */
133	switch (e) {
134	case EACCES:
135		exerrno = 126;
136		break;
137	case ENOENT:
138		exerrno = 127;
139		break;
140	default:
141		exerrno = 2;
142		break;
143	}
144	if (e == ENOENT || e == ENOTDIR)
145		exerror(EXEXEC, "%s: not found", argv[0]);
146	exerror(EXEXEC, "%s: %s", argv[0], strerror(e));
147}
148
149
150STATIC void
151tryexec(char *cmd, char **argv, char **envp)
152{
153	int e;
154
155	execve(cmd, argv, envp);
156	e = errno;
157	if (e == ENOEXEC) {
158		initshellproc();
159		setinputfile(cmd, 0);
160		commandname = arg0 = savestr(argv[0]);
161		setparam(argv + 1);
162		exraise(EXSHELLPROC);
163		/*NOTREACHED*/
164	}
165	errno = e;
166}
167
168/*
169 * Do a path search.  The variable path (passed by reference) should be
170 * set to the start of the path before the first call; padvance will update
171 * this value as it proceeds.  Successive calls to padvance will return
172 * the possible path expansions in sequence.  If an option (indicated by
173 * a percent sign) appears in the path entry then the global variable
174 * pathopt will be set to point to it; otherwise pathopt will be set to
175 * NULL.
176 */
177
178const char *pathopt;
179
180char *
181padvance(const char **path, const char *name)
182{
183	const char *p, *start;
184	char *q;
185	int len;
186
187	if (*path == NULL)
188		return NULL;
189	start = *path;
190	for (p = start; *p && *p != ':' && *p != '%'; p++)
191		; /* nothing */
192	len = p - start + strlen(name) + 2;	/* "2" is for '/' and '\0' */
193	while (stackblocksize() < len)
194		growstackblock();
195	q = stackblock();
196	if (p != start) {
197		memcpy(q, start, p - start);
198		q += p - start;
199		*q++ = '/';
200	}
201	strcpy(q, name);
202	pathopt = NULL;
203	if (*p == '%') {
204		pathopt = ++p;
205		while (*p && *p != ':')  p++;
206	}
207	if (*p == ':')
208		*path = p + 1;
209	else
210		*path = NULL;
211	return stalloc(len);
212}
213
214
215
216/*** Command hashing code ***/
217
218
219int
220hashcmd(int argc __unused, char **argv __unused)
221{
222	struct tblentry **pp;
223	struct tblentry *cmdp;
224	int c;
225	int verbose;
226	struct cmdentry entry;
227	char *name;
228
229	verbose = 0;
230	while ((c = nextopt("rv")) != '\0') {
231		if (c == 'r') {
232			clearcmdentry(0);
233		} else if (c == 'v') {
234			verbose++;
235		}
236	}
237	if (*argptr == NULL) {
238		for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
239			for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
240				if (cmdp->cmdtype == CMDNORMAL)
241					printentry(cmdp, verbose);
242			}
243		}
244		return 0;
245	}
246	while ((name = *argptr) != NULL) {
247		if ((cmdp = cmdlookup(name, 0)) != NULL
248		 && (cmdp->cmdtype == CMDNORMAL
249		     || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
250			delete_cmd_entry();
251		find_command(name, &entry, DO_ERR, pathval());
252		if (verbose) {
253			if (entry.cmdtype != CMDUNKNOWN) {	/* if no error msg */
254				cmdp = cmdlookup(name, 0);
255				if (cmdp != NULL)
256					printentry(cmdp, verbose);
257				else
258					outfmt(out2, "%s: not found\n", name);
259			}
260			flushall();
261		}
262		argptr++;
263	}
264	return 0;
265}
266
267
268STATIC void
269printentry(struct tblentry *cmdp, int verbose)
270{
271	int idx;
272	const char *path;
273	char *name;
274
275	if (cmdp->cmdtype == CMDNORMAL) {
276		idx = cmdp->param.index;
277		path = pathval();
278		do {
279			name = padvance(&path, cmdp->cmdname);
280			stunalloc(name);
281		} while (--idx >= 0);
282		out1str(name);
283	} else if (cmdp->cmdtype == CMDBUILTIN) {
284		out1fmt("builtin %s", cmdp->cmdname);
285	} else if (cmdp->cmdtype == CMDFUNCTION) {
286		out1fmt("function %s", cmdp->cmdname);
287		if (verbose) {
288			INTOFF;
289			name = commandtext(getfuncnode(cmdp->param.func));
290			out1c(' ');
291			out1str(name);
292			ckfree(name);
293			INTON;
294		}
295#ifdef DEBUG
296	} else {
297		error("internal error: cmdtype %d", cmdp->cmdtype);
298#endif
299	}
300	if (cmdp->rehash)
301		out1c('*');
302	out1c('\n');
303}
304
305
306
307/*
308 * Resolve a command name.  If you change this routine, you may have to
309 * change the shellexec routine as well.
310 */
311
312void
313find_command(const char *name, struct cmdentry *entry, int act,
314    const char *path)
315{
316	struct tblentry *cmdp, loc_cmd;
317	int idx;
318	int prev;
319	char *fullname;
320	struct stat statb;
321	int e;
322	int i;
323	int spec;
324
325	/* If name contains a slash, don't use the hash table */
326	if (strchr(name, '/') != NULL) {
327		entry->cmdtype = CMDNORMAL;
328		entry->u.index = 0;
329		return;
330	}
331
332	/* If name is in the table, and not invalidated by cd, we're done */
333	if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0) {
334		if (cmdp->cmdtype == CMDFUNCTION && act & DO_NOFUNC)
335			cmdp = NULL;
336		else
337			goto success;
338	}
339
340	/* If %builtin not in path, check for builtin next */
341	if (builtinloc < 0 && (i = find_builtin(name, &spec)) >= 0) {
342		INTOFF;
343		cmdp = cmdlookup(name, 1);
344		if (cmdp->cmdtype == CMDFUNCTION)
345			cmdp = &loc_cmd;
346		cmdp->cmdtype = CMDBUILTIN;
347		cmdp->param.index = i;
348		cmdp->special = spec;
349		INTON;
350		goto success;
351	}
352
353	/* We have to search path. */
354	prev = -1;		/* where to start */
355	if (cmdp) {		/* doing a rehash */
356		if (cmdp->cmdtype == CMDBUILTIN)
357			prev = builtinloc;
358		else
359			prev = cmdp->param.index;
360	}
361
362	e = ENOENT;
363	idx = -1;
364loop:
365	while ((fullname = padvance(&path, name)) != NULL) {
366		stunalloc(fullname);
367		idx++;
368		if (pathopt) {
369			if (prefix("builtin", pathopt)) {
370				if ((i = find_builtin(name, &spec)) < 0)
371					goto loop;
372				INTOFF;
373				cmdp = cmdlookup(name, 1);
374				if (cmdp->cmdtype == CMDFUNCTION)
375					cmdp = &loc_cmd;
376				cmdp->cmdtype = CMDBUILTIN;
377				cmdp->param.index = i;
378				cmdp->special = spec;
379				INTON;
380				goto success;
381			} else if (prefix("func", pathopt)) {
382				/* handled below */
383			} else {
384				goto loop;	/* ignore unimplemented options */
385			}
386		}
387		/* if rehash, don't redo absolute path names */
388		if (fullname[0] == '/' && idx <= prev) {
389			if (idx < prev)
390				goto loop;
391			TRACE(("searchexec \"%s\": no change\n", name));
392			goto success;
393		}
394		if (stat(fullname, &statb) < 0) {
395			if (errno != ENOENT && errno != ENOTDIR)
396				e = errno;
397			goto loop;
398		}
399		e = EACCES;	/* if we fail, this will be the error */
400		if (!S_ISREG(statb.st_mode))
401			goto loop;
402		if (pathopt) {		/* this is a %func directory */
403			stalloc(strlen(fullname) + 1);
404			readcmdfile(fullname);
405			if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
406				error("%s not defined in %s", name, fullname);
407			stunalloc(fullname);
408			goto success;
409		}
410#ifdef notdef
411		if (statb.st_uid == geteuid()) {
412			if ((statb.st_mode & 0100) == 0)
413				goto loop;
414		} else if (statb.st_gid == getegid()) {
415			if ((statb.st_mode & 010) == 0)
416				goto loop;
417		} else {
418			if ((statb.st_mode & 01) == 0)
419				goto loop;
420		}
421#endif
422		TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
423		INTOFF;
424		cmdp = cmdlookup(name, 1);
425		if (cmdp->cmdtype == CMDFUNCTION)
426			cmdp = &loc_cmd;
427		cmdp->cmdtype = CMDNORMAL;
428		cmdp->param.index = idx;
429		INTON;
430		goto success;
431	}
432
433	/* We failed.  If there was an entry for this command, delete it */
434	if (cmdp && cmdp->cmdtype != CMDFUNCTION)
435		delete_cmd_entry();
436	if (act & DO_ERR) {
437		if (e == ENOENT || e == ENOTDIR)
438			outfmt(out2, "%s: not found\n", name);
439		else
440			outfmt(out2, "%s: %s\n", name, strerror(e));
441	}
442	entry->cmdtype = CMDUNKNOWN;
443	entry->u.index = 0;
444	return;
445
446success:
447	cmdp->rehash = 0;
448	entry->cmdtype = cmdp->cmdtype;
449	entry->u = cmdp->param;
450	entry->special = cmdp->special;
451}
452
453
454
455/*
456 * Search the table of builtin commands.
457 */
458
459int
460find_builtin(const char *name, int *special)
461{
462	const struct builtincmd *bp;
463
464	for (bp = builtincmd ; bp->name ; bp++) {
465		if (*bp->name == *name && equal(bp->name, name)) {
466			*special = bp->special;
467			return bp->code;
468		}
469	}
470	return -1;
471}
472
473
474
475/*
476 * Called when a cd is done.  Marks all commands so the next time they
477 * are executed they will be rehashed.
478 */
479
480void
481hashcd(void)
482{
483	struct tblentry **pp;
484	struct tblentry *cmdp;
485
486	for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
487		for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
488			if (cmdp->cmdtype == CMDNORMAL
489			 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
490				cmdp->rehash = 1;
491		}
492	}
493}
494
495
496
497/*
498 * Called before PATH is changed.  The argument is the new value of PATH;
499 * pathval() still returns the old value at this point.  Called with
500 * interrupts off.
501 */
502
503void
504changepath(const char *newval)
505{
506	const char *old, *new;
507	int idx;
508	int firstchange;
509	int bltin;
510
511	old = pathval();
512	new = newval;
513	firstchange = 9999;	/* assume no change */
514	idx = 0;
515	bltin = -1;
516	for (;;) {
517		if (*old != *new) {
518			firstchange = idx;
519			if ((*old == '\0' && *new == ':')
520			 || (*old == ':' && *new == '\0'))
521				firstchange++;
522			old = new;	/* ignore subsequent differences */
523		}
524		if (*new == '\0')
525			break;
526		if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
527			bltin = idx;
528		if (*new == ':') {
529			idx++;
530		}
531		new++, old++;
532	}
533	if (builtinloc < 0 && bltin >= 0)
534		builtinloc = bltin;		/* zap builtins */
535	if (builtinloc >= 0 && bltin < 0)
536		firstchange = 0;
537	clearcmdentry(firstchange);
538	builtinloc = bltin;
539}
540
541
542/*
543 * Clear out command entries.  The argument specifies the first entry in
544 * PATH which has changed.
545 */
546
547void
548clearcmdentry(int firstchange)
549{
550	struct tblentry **tblp;
551	struct tblentry **pp;
552	struct tblentry *cmdp;
553
554	INTOFF;
555	for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
556		pp = tblp;
557		while ((cmdp = *pp) != NULL) {
558			if ((cmdp->cmdtype == CMDNORMAL &&
559			     cmdp->param.index >= firstchange)
560			 || (cmdp->cmdtype == CMDBUILTIN &&
561			     builtinloc >= firstchange)) {
562				*pp = cmdp->next;
563				ckfree(cmdp);
564			} else {
565				pp = &cmdp->next;
566			}
567		}
568	}
569	INTON;
570}
571
572
573/*
574 * Delete all functions.
575 */
576
577#ifdef mkinit
578MKINIT void deletefuncs(void);
579
580SHELLPROC {
581	deletefuncs();
582}
583#endif
584
585void
586deletefuncs(void)
587{
588	struct tblentry **tblp;
589	struct tblentry **pp;
590	struct tblentry *cmdp;
591
592	INTOFF;
593	for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
594		pp = tblp;
595		while ((cmdp = *pp) != NULL) {
596			if (cmdp->cmdtype == CMDFUNCTION) {
597				*pp = cmdp->next;
598				unreffunc(cmdp->param.func);
599				ckfree(cmdp);
600			} else {
601				pp = &cmdp->next;
602			}
603		}
604	}
605	INTON;
606}
607
608
609
610/*
611 * Locate a command in the command hash table.  If "add" is nonzero,
612 * add the command to the table if it is not already present.  The
613 * variable "lastcmdentry" is set to point to the address of the link
614 * pointing to the entry, so that delete_cmd_entry can delete the
615 * entry.
616 */
617
618STATIC struct tblentry **lastcmdentry;
619
620
621STATIC struct tblentry *
622cmdlookup(const char *name, int add)
623{
624	int hashval;
625	const char *p;
626	struct tblentry *cmdp;
627	struct tblentry **pp;
628
629	p = name;
630	hashval = *p << 4;
631	while (*p)
632		hashval += *p++;
633	hashval &= 0x7FFF;
634	pp = &cmdtable[hashval % CMDTABLESIZE];
635	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
636		if (equal(cmdp->cmdname, name))
637			break;
638		pp = &cmdp->next;
639	}
640	if (add && cmdp == NULL) {
641		INTOFF;
642		cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
643					+ strlen(name) + 1);
644		cmdp->next = NULL;
645		cmdp->cmdtype = CMDUNKNOWN;
646		cmdp->rehash = 0;
647		strcpy(cmdp->cmdname, name);
648		INTON;
649	}
650	lastcmdentry = pp;
651	return cmdp;
652}
653
654/*
655 * Delete the command entry returned on the last lookup.
656 */
657
658STATIC void
659delete_cmd_entry(void)
660{
661	struct tblentry *cmdp;
662
663	INTOFF;
664	cmdp = *lastcmdentry;
665	*lastcmdentry = cmdp->next;
666	ckfree(cmdp);
667	INTON;
668}
669
670
671
672/*
673 * Add a new command entry, replacing any existing command entry for
674 * the same name.
675 */
676
677void
678addcmdentry(const char *name, struct cmdentry *entry)
679{
680	struct tblentry *cmdp;
681
682	INTOFF;
683	cmdp = cmdlookup(name, 1);
684	if (cmdp->cmdtype == CMDFUNCTION) {
685		unreffunc(cmdp->param.func);
686	}
687	cmdp->cmdtype = entry->cmdtype;
688	cmdp->param = entry->u;
689	INTON;
690}
691
692
693/*
694 * Define a shell function.
695 */
696
697void
698defun(const char *name, union node *func)
699{
700	struct cmdentry entry;
701
702	INTOFF;
703	entry.cmdtype = CMDFUNCTION;
704	entry.u.func = copyfunc(func);
705	addcmdentry(name, &entry);
706	INTON;
707}
708
709
710/*
711 * Delete a function if it exists.
712 */
713
714int
715unsetfunc(const char *name)
716{
717	struct tblentry *cmdp;
718
719	if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
720		unreffunc(cmdp->param.func);
721		delete_cmd_entry();
722		return (0);
723	}
724	return (0);
725}
726
727/*
728 * Shared code for the following builtin commands:
729 *    type, command -v, command -V
730 */
731
732int
733typecmd_impl(int argc, char **argv, int cmd, const char *path)
734{
735	struct cmdentry entry;
736	struct tblentry *cmdp;
737	const char *const *pp;
738	struct alias *ap;
739	int i;
740	int error1 = 0;
741
742	if (path != pathval())
743		clearcmdentry(0);
744
745	for (i = 1; i < argc; i++) {
746		/* First look at the keywords */
747		for (pp = parsekwd; *pp; pp++)
748			if (**pp == *argv[i] && equal(*pp, argv[i]))
749				break;
750
751		if (*pp) {
752			if (cmd == TYPECMD_SMALLV)
753				out1fmt("%s\n", argv[i]);
754			else
755				out1fmt("%s is a shell keyword\n", argv[i]);
756			continue;
757		}
758
759		/* Then look at the aliases */
760		if ((ap = lookupalias(argv[i], 1)) != NULL) {
761			if (cmd == TYPECMD_SMALLV)
762				out1fmt("alias %s='%s'\n", argv[i], ap->val);
763			else
764				out1fmt("%s is an alias for %s\n", argv[i],
765				    ap->val);
766			continue;
767		}
768
769		/* Then check if it is a tracked alias */
770		if ((cmdp = cmdlookup(argv[i], 0)) != NULL) {
771			entry.cmdtype = cmdp->cmdtype;
772			entry.u = cmdp->param;
773			entry.special = cmdp->special;
774		}
775		else {
776			/* Finally use brute force */
777			find_command(argv[i], &entry, 0, path);
778		}
779
780		switch (entry.cmdtype) {
781		case CMDNORMAL: {
782			if (strchr(argv[i], '/') == NULL) {
783				const char *path2 = path;
784				char *name;
785				int j = entry.u.index;
786				do {
787					name = padvance(&path2, argv[i]);
788					stunalloc(name);
789				} while (--j >= 0);
790				if (cmd == TYPECMD_SMALLV)
791					out1fmt("%s\n", name);
792				else
793					out1fmt("%s is%s %s\n", argv[i],
794					    (cmdp && cmd == TYPECMD_TYPE) ?
795						" a tracked alias for" : "",
796					    name);
797			} else {
798				if (eaccess(argv[i], X_OK) == 0) {
799					if (cmd == TYPECMD_SMALLV)
800						out1fmt("%s\n", argv[i]);
801					else
802						out1fmt("%s is %s\n", argv[i],
803						    argv[i]);
804				} else {
805					if (cmd != TYPECMD_SMALLV)
806						outfmt(out2, "%s: %s\n",
807						    argv[i], strerror(errno));
808					error1 |= 127;
809				}
810			}
811			break;
812		}
813		case CMDFUNCTION:
814			if (cmd == TYPECMD_SMALLV)
815				out1fmt("%s\n", argv[i]);
816			else
817				out1fmt("%s is a shell function\n", argv[i]);
818			break;
819
820		case CMDBUILTIN:
821			if (cmd == TYPECMD_SMALLV)
822				out1fmt("%s\n", argv[i]);
823			else if (entry.special)
824				out1fmt("%s is a special shell builtin\n",
825				    argv[i]);
826			else
827				out1fmt("%s is a shell builtin\n", argv[i]);
828			break;
829
830		default:
831			if (cmd != TYPECMD_SMALLV)
832				outfmt(out2, "%s: not found\n", argv[i]);
833			error1 |= 127;
834			break;
835		}
836	}
837
838	if (path != pathval())
839		clearcmdentry(0);
840
841	return error1;
842}
843
844/*
845 * Locate and print what a word is...
846 */
847
848int
849typecmd(int argc, char **argv)
850{
851	return typecmd_impl(argc, argv, TYPECMD_TYPE, bltinlookup("PATH", 1));
852}
853