exec.c@ 3505

Last change on this file since 3505 was 3480, checked in by bird, 4 years ago
kash: build fixes (darwin).
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1	/* $NetBSD: exec.c,v 1.37 2003/08/07 09:05:31 agc Exp $ */
2
3	/*-
4	* Copyright (c) 1991, 1993
5	* The Regents of the University of California. All rights reserved.
6	*
7	* This code is derived from software contributed to Berkeley by
8	* Kenneth Almquist.
9	*
10	* Redistribution and use in source and binary forms, with or without
11	* modification, are permitted provided that the following conditions
12	* are met:
13	* 1. Redistributions of source code must retain the above copyright
14	* notice, this list of conditions and the following disclaimer.
15	* 2. Redistributions in binary form must reproduce the above copyright
16	* notice, this list of conditions and the following disclaimer in the
17	* documentation and/or other materials provided with the distribution.
18	* 3. Neither the name of the University nor the names of its contributors
19	* may be used to endorse or promote products derived from this software
20	* without specific prior written permission.
21	*
22	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32	* SUCH DAMAGE.
33	*/
34
35	#if 0
36	#ifndef lint
37	static char sccsid[] = "@(#)exec.c 8.4 (Berkeley) 6/8/95";
38	#else
39	__RCSID("$NetBSD: exec.c,v 1.37 2003/08/07 09:05:31 agc Exp $");
40	#endif /* not lint */
41	#endif
42
43	#include <sys/types.h>
44	#include <errno.h>
45	#include <stdio.h>
46	#include <stdlib.h>
47	#include <stddef.h>
48
49	/*
50	* When commands are first encountered, they are entered in a hash table.
51	* This ensures that a full path search will not have to be done for them
52	* on each invocation.
53	*
54	* We should investigate converting to a linear search, even though that
55	* would make the command name "hash" a misnomer.
56	*/
57
58	#include "shell.h"
59	#include "main.h"
60	#include "nodes.h"
61	#include "parser.h"
62	#include "redir.h"
63	#include "eval.h"
64	#include "exec.h"
65	#include "builtins.h"
66	#include "var.h"
67	#include "options.h"
68	#include "input.h"
69	#include "output.h"
70	#include "syntax.h"
71	#include "memalloc.h"
72	#include "error.h"
73	#include "init.h"
74	#include "mystring.h"
75	#include "show.h"
76	#include "jobs.h"
77	#include "alias.h"
78	#ifdef __INNOTEK_LIBC__
79	#include <InnoTekLIBC/backend.h>
80	#endif
81	#include "shinstance.h"
82
83	//#define CMDTABLESIZE 31 /* should be prime */
84	//#define ARB 1 /* actual size determined at run time */
85	//
86	//
87	//
88	//struct tblentry {
89	// struct tblentry next; / next entry in hash chain */
90	// union param param; /* definition of builtin function */
91	// short cmdtype; /* index identifying command */
92	// char rehash; /* if set, cd done since entry created */
93	// char cmdname[ARB]; /* name of command */
94	//};
95	//
96	//
97	//STATIC struct tblentry *cmdtable[CMDTABLESIZE];
98	//STATIC int builtinloc = -1; /* index in path of %builtin, or -1 */
99	//int exerrno = 0; /* Last exec error */
100	#ifdef PC_EXE_EXTS
101	STATIC const char * const g_exe_suffixes[] = { "", ".exe", ".cmd", ".btm", ".com" };
102	#endif
103
104
105	STATIC void tryexec(shinstance , char , char , char , int);
106	STATIC void execinterp(shinstance , char , char *);
107	STATIC void printentry(shinstance , struct tblentry , int);
108	STATIC void clearcmdentry(shinstance *, int);
109	STATIC struct tblentry cmdlookup(shinstance , const char *, int);
110	STATIC void delete_cmd_entry(shinstance *);
111	#ifdef PC_EXE_EXTS
112	STATIC int stat_pc_exec_exts(shinstance , char fullname, int has_ext, int *suffixp);
113	#endif
114
115
116	extern char *const parsekwd[];
117
118	#ifndef SH_FORKED_MODE
119	void
120	subshellinitexec(shinstance psh, shinstance inherit)
121	{
122	unsigned i;
123	for (i = 0; i < K_ELEMENTS(inherit->cmdtable); i++) {
124	struct tblentry const *csrc = inherit->cmdtable[i];
125	if (!csrc) {
126	} else {
127	struct tblentry **ppdst = &psh->cmdtable[i];
128	do
129	{
130	size_t const namesize = strlen(csrc->cmdname) + 1;
131	size_t const entrysize = offsetof(struct tblentry, cmdname) + namesize;
132	struct tblentry dst = (struct tblentry )ckmalloc(psh, entrysize);
133	memcpy(dst->cmdname, csrc->cmdname, namesize);
134	dst->rehash = csrc->rehash;
135	dst->cmdtype = csrc->cmdtype;
136
137	dst->param.func = NULL;
138	switch (csrc->cmdtype) {
139	case CMDUNKNOWN:
140	case CMDNORMAL:
141	dst->param.n.index = csrc->param.n.index;
142	dst->param.n.suffix = csrc->param.n.suffix;
143	break;
144	case CMDFUNCTION:
145	dst->param.func = copyfunc(psh, csrc->param.func); /** @todo optimize function allocations */
146	break;
147	case CMDBUILTIN:
148	case CMDSPLBLTIN:
149	dst->param.bltin = csrc->param.bltin;
150	break;
151	}
152
153	*ppdst = dst;
154	ppdst = &dst->next;
155
156	csrc = csrc->next;
157	} while (csrc);
158	*ppdst = NULL;
159	}
160	}
161
162	psh->builtinloc = inherit->builtinloc;
163	}
164	#endif /* SH_FORKED_MODE */
165
166
167	/*
168	* Check if 'path' is an absolute (starts with root) path or not.
169	*/
170	K_INLINE int isabspath(const char *path)
171	{
172	#if K_OS == K_OS_WINDOWS \|\| K_OS == K_OS_OS2
173	if (path[0] == '/' \|\| path[0] == '\\') {
174	if ( (path[1] == '/' \|\| path[1] == '\\')
175	&& (path[2] != '/' && path[2] != '\\' && path[2]))
176	return 1;
177	} else if (path[0] && path[1] == ':' && (path[2] == '\\' \|\| path[2] == '/') && isalpha(path[0])) {
178	return 1;
179	}
180	return 0;
181	#else
182	return path[0] == '/';
183	#endif
184	}
185
186	/*
187	* Checks if the filename include a path or not.
188	*/
189	K_INLINE int haspath(const char *name)
190	{
191	#if K_OS == K_OS_WINDOWS \|\| K_OS == K_OS_OS2
192	return strchr(name, '/') != NULL
193	\|\| strchr(name, '\\') != NULL
194	\|\| (name[0] && name[1] == ':');
195	#else
196	return strchr(name, '/') != NULL;
197	#endif
198	}
199
200
201	/*
202	* Exec a program. Never returns. If you change this routine, you may
203	* have to change the find_command routine as well.
204	*/
205
206	SH_NORETURN_1 void
207	shellexec(shinstance psh, char argv, char envp, const char path, int idx, int suffix)
208	{
209	char *cmdname;
210	int e;
211	const char *argv0 = argv[0];
212	int argv0len = (int)strlen(argv0);
213	char kmkcmd[48];
214	#ifdef PC_EXE_EXTS
215	int has_ext = argv0len - 4;
216	has_ext = has_ext > 0
217	&& argv0[has_ext] == '.'
218	/* use strstr and upper/lower permuated extensions to avoid multiple strcasecmp calls. */
219	&& strstr("exe;" "Exe;" "EXe;" "EXE;" "ExE;" "eXe;" "eXE;" "exE;"
220	"cmd;" "Cmd;" "CMd;" "CMD;" "CmD;" "cMd;" "cMD;" "cmD;"
221	"com;" "Com;" "COm;" "COM;" "CoM;" "cOm;" "cOM;" "coM;"
222	"bat;" "Bat;" "BAt;" "BAT;" "BaT;" "bAt;" "bAT;" "baT;"
223	"btm;" "Btm;" "BTm;" "BTM;" "BtM;" "bTm;" "bTM;" "btM;",
224	argv0 + has_ext + 1)
225	!= NULL;
226	#else
227	const int has_ext = 1;
228	#endif
229	TRACE((psh, "shellexec: argv[0]=%s idx=%d suffix=%d\n", argv0, idx, suffix));
230	if (haspath(argv0)) {
231	#ifdef PC_EXE_EXTS
232	if (!has_ext && suffix && (unsigned)suffix < K_ELEMENTS(g_exe_suffixes)) {
233	size_t sufflen = strlen(g_exe_suffixes[suffix]);
234	cmdname = stalloc(psh, argv0len + sufflen + 1);
235	memcpy(cmdname, argv0, argv0len);
236	memcpy(cmdname + argv0len, g_exe_suffixes[suffix], sufflen + 1);
237	} else
238	#endif
239	{
240	cmdname = stalloc(psh, argv0len + 5);
241	memcpy(cmdname, argv0, argv0len + 1);
242	}
243	tryexec(psh, cmdname, argv, envp, has_ext);
244	TRACE((psh, "shellexec: cmdname=%s\n", cmdname));
245	stunalloc(psh, cmdname);
246	e = errno;
247	} else {
248	/* Before we search the PATH, transform kmk_builtin_% to kmk_% so we don't
249	need to be too careful mixing internal and external kmk commands. */
250	if ( argv0len > 12
251	&& argv0len < 42
252	&& strncmp(argv0, "kmk_builtin_", 12) == 0
253	&& strpbrk(argv0 + 12, "./\\-:;<>") == NULL) {
254	memcpy(kmkcmd, "kmk_", 4);
255	memcpy(&kmkcmd[4], argv0 + 12, argv0len + 1 - 8);
256	TRACE((psh, "shellexec: dropped '_builtin' from %s to %s\n", argv0, kmkcmd));
257	argv0len -= 8;
258	argv0 = kmkcmd;
259	}
260
261	e = ENOENT;
262	while ((cmdname = padvance(psh, &path, argv0)) != NULL) {
263	if (--idx < 0 && psh->pathopt == NULL) {
264	#ifdef PC_EXE_EXTS
265	if (!has_ext && idx == -1 && suffix && (unsigned)suffix < K_ELEMENTS(g_exe_suffixes))
266	strcat(cmdname, g_exe_suffixes[suffix]);
267	#endif
268	tryexec(psh, cmdname, argv, envp, has_ext);
269	if (errno != ENOENT && errno != ENOTDIR)
270	e = errno;
271	}
272	stunalloc(psh, cmdname);
273	}
274	}
275
276	/* Map to POSIX errors */
277	switch (e) {
278	case EACCES:
279	psh->exerrno = 126;
280	break;
281	case ENOENT:
282	psh->exerrno = 127;
283	break;
284	default:
285	psh->exerrno = 2;
286	break;
287	}
288	TRACE((psh, "shellexec failed for '%s', errno %d, suppressint %d\n",
289	argv[0], e, psh->suppressint ));
290	exerror(psh, EXEXEC, "%s: %s", argv[0], errmsg(psh, e, E_EXEC));
291	/* NOTREACHED */
292	}
293
294
295	STATIC void
296	tryexec(shinstance psh, char cmd, char argv, char envp, int has_ext)
297	{
298	int e;
299	#ifdef EXEC_HASH_BANG_SCRIPT
300	char *p;
301	#endif
302	#ifdef PC_EXE_EXTS
303	/* exploit the effect of stat_pc_exec_exts which adds the
304	* correct extentions to the file. */
305	if (!has_ext) {
306	int suffix;
307	int isreg = stat_pc_exec_exts(psh, cmd, 0, &suffix);
308	kHlpAssert(isreg > 0);
309	}
310	#endif
311	#if defined(__INNOTEK_LIBC__) && defined(EXEC_HASH_BANG_SCRIPT)
312	__libc_Back_gfProcessHandleHashBangScripts = 0;
313	#endif
314
315	#ifdef SYSV
316	do {
317	sh_execve(psh, cmd, argv, envp);
318	} while (errno == EINTR);
319	#else
320	sh_execve(psh, cmd, (const char * const)argv, (const char const*)envp);
321	#endif
322	e = errno;
323	if (e == ENOEXEC) {
324	initshellproc(psh);
325	setinputfile(psh, cmd, 0);
326	if (psh->commandnamemalloc) {
327	sh_free(psh, psh->commandname);
328	psh->commandnamemalloc = 0;
329	}
330	if (psh->arg0malloc)
331	sh_free(psh, psh->arg0);
332	psh->commandname = psh->arg0 = savestr(psh, argv[0]);
333	psh->arg0malloc = 1;
334	#ifdef EXEC_HASH_BANG_SCRIPT
335	pgetc(psh); pungetc(psh); /* fill up input buffer */
336	p = psh->parsenextc;
337	if (psh->parsenleft > 2 && p[0] == '#' && p[1] == '!') {
338	argv[0] = cmd;
339	execinterp(psh, argv, envp);
340	}
341	#endif
342	setparam(psh, argv + 1);
343	exraise(psh, EXSHELLPROC);
344	}
345	errno = e;
346	}
347
348	#ifdef EXEC_HASH_BANG_SCRIPT
349
350	/*
351	* Checks if NAME is the (base) name of the shell executable or something
352	* very similar.
353	*/
354	STATIC int
355	is_shell_exe_name(const char *name)
356	{
357	return equal(name, "kmk_ash")
358	\|\| equal(name, "kmk_sh")
359	\|\| equal(name, "kash")
360	\|\| equal(name, "sh");
361	}
362
363	/*
364	* Execute an interpreter introduced by "#!", for systems where this
365	* feature has not been built into the kernel. If the interpreter is
366	* the shell, return (effectively ignoring the "#!"). If the execution
367	* of the interpreter fails, exit.
368	*
369	* This code peeks inside the input buffer in order to avoid actually
370	* reading any input. It would benefit from a rewrite.
371	*/
372
373	#define NEWARGS 16
374
375	STATIC void
376	execinterp(shinstance psh, char argv, char *envp)
377	{
378	int n;
379	char *inp;
380	char *outp;
381	char c;
382	char *p;
383	char **ap;
384	char *newargs[NEWARGS];
385	intptr_t i;
386	char **ap2;
387	char **new;
388
389	/* Split the string into arguments. */
390	n = psh->parsenleft - 2;
391	inp = psh->parsenextc + 2;
392	ap = newargs;
393	for (;;) {
394	while (--n >= 0 && (inp == ' ' \|\| inp == '\t'))
395	inp++;
396	if (n < 0)
397	goto bad;
398	if ((c = *inp++) == '\n')
399	break;
400	if (ap == &newargs[NEWARGS])
401	bad: error(psh, "Bad #! line");
402	STARTSTACKSTR(psh, outp);
403	do {
404	STPUTC(psh, c, outp);
405	} while (--n >= 0 && (c = *inp++) != ' ' && c != '\t' && c != '\n');
406	STPUTC(psh, '\0', outp);
407	n++, inp--;
408	*ap++ = grabstackstr(psh, outp);
409	}
410
411	/* /usr/bin/env emulation, very common with kash/kmk_ash. */
412	i = ap - newargs;
413	if (i > 1 && equal(newargs[0], "/usr/bin/env")) {
414	if ( !strchr(newargs[1], '=')
415	&& newargs[1][0] != '-') {
416	/* shellexec below searches the PATH for us, so just
417	drop /usr/bin/env. */
418	TRACE((psh, "hash bang /usr/bin/env utility, dropping /usr/bin/env\n"));
419	ap--;
420	i--;
421	for (n = 0; n < i; n++)
422	newargs[n] = newargs[n + 1];
423	} /* else: complicated invocation */
424	}
425
426	/* If the interpreter is the shell or a similar shell, there is
427	no need to exec. */
428	if (i == 1) {
429	p = strrchr(newargs[0], '/');
430	if (!p)
431	p = newargs[0];
432	if (is_shell_exe_name(p)) {
433	TRACE((psh, "hash bang self\n"));
434	return;
435	}
436	}
437
438	/* Combine the two argument lists and exec. */
439	i = (char )ap - (char )newargs; /* size in bytes */
440	if (i == 0)
441	error(psh, "Bad #! line");
442	for (ap2 = argv ; *ap2++ != NULL ; );
443	new = ckmalloc(psh, i + ((char )ap2 - (char )argv));
444	ap = newargs, ap2 = new;
445	while ((i -= sizeof (char **)) >= 0)
446	ap2++ = ap++;
447	ap = argv;
448	while ((ap2++ = ap++))
449	/* nothing*/;
450	TRACE((psh, "hash bang '%s'\n", new[0]));
451	shellexec(psh, new, envp, pathval(psh), 0, -1);
452	/* NOTREACHED */
453	}
454
455	#endif /* EXEC_HASH_BANG_SCRIPT */
456
457
458	/*
459	* Do a path search. The variable path (passed by reference) should be
460	* set to the start of the path before the first call; padvance will update
461	* this value as it proceeds. Successive calls to padvance will return
462	* the possible path expansions in sequence. If an option (indicated by
463	* a percent sign) appears in the path entry then the global variable
464	* psh->pathopt will be set to point to it; otherwise psh->pathopt will be set to
465	* NULL.
466	*/
467
468	//const char *pathopt;
469
470	char *
471	padvance(shinstance psh, const char path, const char name)
472	{
473	const char *p;
474	char *q;
475	const char *start;
476	int len;
477
478	if (*path == NULL)
479	return NULL;
480	start = *path;
481	#ifdef PC_PATH_SEP
482	for (p = start ; p && p != ';' && *p != '%' ; p++);
483	#else
484	for (p = start ; p && p != ':' && *p != '%' ; p++);
485	#endif
486	len = (int)(p - start + strlen(name) + 2); /* "2" is for '/' and '\0' */
487	#ifdef PC_EXE_EXTS
488	len += 4; /* "4" is for .exe/.com/.cmd/.bat/.btm */
489	#endif
490	while (stackblocksize(psh) < len)
491	growstackblock(psh);
492	q = stackblock(psh);
493	if (p != start) {
494	memcpy(q, start, p - start);
495	q += p - start;
496	*q++ = '/';
497	}
498	strcpy(q, name);
499	psh->pathopt = NULL;
500	if (*p == '%') {
501	psh->pathopt = ++p;
502	#ifdef PC_PATH_SEP
503	while (p && p != ';') p++;
504	#else
505	while (p && p != ':') p++;
506	#endif
507	}
508	#ifdef PC_PATH_SEP
509	if (*p == ';')
510	#else
511	if (*p == ':')
512	#endif
513	*path = p + 1;
514	else
515	*path = NULL;
516	return stalloc(psh, len);
517	}
518
519
520	#ifdef PC_EXE_EXTS
521	STATIC int stat_pc_exec_exts(shinstance psh, char fullname, int has_ext, int *suffixp)
522	{
523	int isreg;
524
525	/* skip the SYSV crap */
526	if ((isreg = shfile_stat_isreg(&psh->fdtab, fullname)) >= 1) {
527	*suffixp = 0;
528	return isreg;
529	}
530	if (!has_ext && errno == ENOENT)
531	{
532	/* Ignore non-regular files here. */
533	char *psz = strchr(fullname, '\0');
534	int i;
535	for (i = 1 /first entry is empty/; i < K_ELEMENTS(g_exe_suffixes); i++) {
536	strcpy(psz, g_exe_suffixes[i]);
537	if ((isreg = shfile_stat_isreg(&psh->fdtab, fullname)) >= 1) {
538	*suffixp = i;
539	return isreg;
540	}
541	if (isreg < 0 && errno != ENOENT && errno != ENOTDIR)
542	break;
543	}
544	}
545	*suffixp = -1;
546	return isreg;
547	}
548	#endif /* PC_EXE_EXTS */
549
550
551
552	/* Command hashing code */
553
554
555	int
556	hashcmd(shinstance psh, int argc, char *argv)
557	{
558	struct tblentry **pp;
559	struct tblentry *cmdp;
560	int c;
561	int verbose;
562	struct cmdentry entry;
563	char *name;
564
565	verbose = 0;
566	while ((c = nextopt(psh, "rv")) != '\0') {
567	if (c == 'r') {
568	clearcmdentry(psh, 0);
569	} else if (c == 'v') {
570	verbose++;
571	}
572	}
573	if (*psh->argptr == NULL) {
574	for (pp = psh->cmdtable ; pp < &psh->cmdtable[CMDTABLESIZE] ; pp++) {
575	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
576	if (verbose \|\| cmdp->cmdtype == CMDNORMAL)
577	printentry(psh, cmdp, verbose);
578	}
579	}
580	return 0;
581	}
582	while ((name = *psh->argptr) != NULL) {
583	if ((cmdp = cmdlookup(psh, name, 0)) != NULL
584	&& (cmdp->cmdtype == CMDNORMAL
585	\|\| (cmdp->cmdtype == CMDBUILTIN && psh->builtinloc >= 0)))
586	delete_cmd_entry(psh);
587	find_command(psh, name, &entry, DO_ERR, pathval(psh));
588	if (verbose) {
589	if (entry.cmdtype != CMDUNKNOWN) { /* if no error msg */
590	cmdp = cmdlookup(psh, name, 0);
591	printentry(psh, cmdp, verbose);
592	}
593	output_flushall(psh);
594	}
595	psh->argptr++;
596	}
597	return 0;
598	}
599
600
601	STATIC void
602	printentry(shinstance psh, struct tblentry cmdp, int verbose)
603	{
604	int idx;
605	const char *path;
606	char *name;
607
608	switch (cmdp->cmdtype) {
609	case CMDNORMAL:
610	idx = cmdp->param.n.index;
611	path = pathval(psh);
612	do {
613	name = padvance(psh, &path, cmdp->cmdname);
614	stunalloc(psh, name);
615	} while (--idx >= 0);
616	out1str(psh, name);
617	#ifdef PC_EXE_EXTS
618	if ((unsigned)cmdp->param.n.suffix < K_ELEMENTS(g_exe_suffixes))
619	out1str(psh, g_exe_suffixes[cmdp->param.n.suffix]);
620	#endif
621	break;
622	case CMDSPLBLTIN:
623	out1fmt(psh, "special builtin %s", cmdp->cmdname);
624	break;
625	case CMDBUILTIN:
626	out1fmt(psh, "builtin %s", cmdp->cmdname);
627	break;
628	case CMDFUNCTION:
629	out1fmt(psh, "function %s", cmdp->cmdname);
630	if (verbose) {
631	struct procstat ps;
632	INTOFF;
633	commandtext(psh, &ps, cmdp->param.func);
634	INTON;
635	out1str(psh, "() { ");
636	out1str(psh, ps.cmd);
637	out1str(psh, "; }");
638	}
639	break;
640	default:
641	error(psh, "internal error: %s cmdtype %d", cmdp->cmdname, cmdp->cmdtype);
642	}
643	if (cmdp->rehash)
644	out1c(psh, '*');
645	out1c(psh, '\n');
646	}
647
648
649
650	/*
651	* Resolve a command name. If you change this routine, you may have to
652	* change the shellexec routine as well.
653	*/
654
655	void
656	find_command(shinstance psh, char name, struct cmdentry entry, int act, const char path)
657	{
658	struct tblentry *cmdp, loc_cmd;
659	int idx;
660	int prev;
661	char *fullname;
662	int e;
663	int (bltin)(shinstance,int,char **);
664	int argv0len = (int)strlen(name);
665	char kmkcmd[48];
666	#ifdef PC_EXE_EXTS
667	int has_ext = argv0len - 4;
668	has_ext = has_ext > 0
669	&& name[has_ext] == '.'
670	/* use strstr and upper/lower permuated extensions to avoid multiple strcasecmp calls. */
671	&& strstr("exe;" "Exe;" "EXe;" "EXE;" "ExE;" "eXe;" "eXE;" "exE;"
672	"cmd;" "Cmd;" "CMd;" "CMD;" "CmD;" "cMd;" "cMD;" "cmD;"
673	"com;" "Com;" "COm;" "COM;" "CoM;" "cOm;" "cOM;" "coM;"
674	"bat;" "Bat;" "BAt;" "BAT;" "BaT;" "bAt;" "bAT;" "baT;"
675	"btm;" "Btm;" "BTm;" "BTM;" "BtM;" "bTm;" "bTM;" "btM;",
676	name + has_ext + 1)
677	!= NULL;
678	#endif
679
680	/* If name contains a slash, don't use PATH or hash table */
681	if (haspath(name)) {
682	if (act & DO_ABS) {
683	while (shfile_stat_exists(&psh->fdtab, name) < 0) {
684	#ifdef SYSV
685	if (errno == EINTR)
686	continue;
687	#endif
688	if (errno != ENOENT && errno != ENOTDIR)
689	e = errno;
690	entry->cmdtype = CMDUNKNOWN;
691	entry->u.n.index = -1;
692	entry->u.n.suffix = -1;
693	return;
694	}
695	entry->cmdtype = CMDNORMAL;
696	entry->u.n.index = -1;
697	entry->u.n.suffix = -1;
698	return;
699	}
700	entry->cmdtype = CMDNORMAL;
701	entry->u.n.index = 0;
702	entry->u.n.suffix = 0;
703	return;
704	}
705
706	if (path != pathval(psh))
707	act \|= DO_ALTPATH;
708
709	if (act & DO_ALTPATH && strstr(path, "%builtin") != NULL)
710	act \|= DO_ALTBLTIN;
711
712	/* If name is in the table, check answer will be ok */
713	if ((cmdp = cmdlookup(psh, name, 0)) != NULL) {
714	do {
715	switch (cmdp->cmdtype) {
716	case CMDNORMAL:
717	if (act & DO_ALTPATH) {
718	cmdp = NULL;
719	continue;
720	}
721	break;
722	case CMDFUNCTION:
723	if (act & DO_NOFUNC) {
724	cmdp = NULL;
725	continue;
726	}
727	break;
728	case CMDBUILTIN:
729	if ((act & DO_ALTBLTIN) \|\| psh->builtinloc >= 0) {
730	cmdp = NULL;
731	continue;
732	}
733	break;
734	}
735	/* if not invalidated by cd, we're done */
736	if (cmdp->rehash == 0)
737	goto success;
738	} while (0);
739	}
740
741	/* If %builtin not in path, check for builtin next */
742	if ((act & DO_ALTPATH ? !(act & DO_ALTBLTIN) : psh->builtinloc < 0) &&
743	(bltin = find_builtin(psh, name)) != 0)
744	goto builtin_success;
745
746	/* We have to search path. */
747	prev = -1; /* where to start */
748	if (cmdp) { /* doing a rehash */
749	if (cmdp->cmdtype == CMDBUILTIN)
750	prev = psh->builtinloc;
751	else
752	prev = cmdp->param.n.index;
753	}
754
755	/* Before we search the PATH, transform kmk_builtin_% to kmk_% so we don't
756	need to be too careful mixing internal and external kmk command. */
757	if ( argv0len > 12
758	&& argv0len < (int)sizeof(kmkcmd)
759	&& strncmp(name, "kmk_builtin_", 12) == 0
760	&& strpbrk(name + 12, "./\\-:;<>") == NULL) {
761	memcpy(kmkcmd, "kmk_", 4);
762	memcpy(&kmkcmd[4], name + 12, argv0len + 1 - 8);
763	TRACE((psh, "find_command: dropped '_builtin' from %s to %s\n", name, kmkcmd));
764	argv0len -= 8;
765	name = kmkcmd;
766	}
767
768	e = ENOENT;
769	idx = -1;
770	loop:
771	while ((fullname = padvance(psh, &path, name)) != NULL) {
772	#ifdef PC_EXE_EXTS
773	int suffix;
774	#endif
775	int isreg;
776	stunalloc(psh, fullname);
777	idx++;
778	if (psh->pathopt) {
779	if (prefix("builtin", psh->pathopt)) {
780	if ((bltin = find_builtin(psh, name)) == 0)
781	goto loop;
782	goto builtin_success;
783	} else if (prefix("func", psh->pathopt)) {
784	/* handled below */
785	} else {
786	/* ignore unimplemented options */
787	goto loop;
788	}
789	}
790	/* if rehash, don't redo absolute path names */
791	if (idx <= prev && isabspath(fullname)) {
792	if (idx < prev)
793	goto loop;
794	TRACE((psh, "searchexec \"%s\": no change\n", name));
795	goto success;
796	}
797	#ifdef PC_EXE_EXTS
798	while ((isreg = stat_pc_exec_exts(psh, fullname, has_ext, &suffix)) < 0) {
799	#else
800	while ((isreg = shfile_stat_isreg(&psh->fdtab, fullname)) < 0) {
801	#endif
802	#ifdef SYSV
803	if (errno == EINTR)
804	continue;
805	#endif
806	if (errno != ENOENT && errno != ENOTDIR)
807	e = errno;
808
809	goto loop;
810	}
811	e = EACCES; /* if we fail, this will be the error */
812	if (isreg < 1)
813	goto loop;
814	if (psh->pathopt) { /* this is a %func directory */
815	if (act & DO_NOFUNC)
816	goto loop;
817	stalloc(psh, strlen(fullname) + 1);
818	readcmdfile(psh, fullname);
819	if ((cmdp = cmdlookup(psh, name, 0)) == NULL \|\|
820	cmdp->cmdtype != CMDFUNCTION)
821	error(psh, "%s not defined in %s", name, fullname);
822	stunalloc(psh, fullname);
823	goto success;
824	}
825	#ifdef notdef
826	/* XXX this code stops root executing stuff, and is buggy
827	if you need a group from the group list. */
828	if (statb.st_uid == sh_geteuid(psh)) {
829	if ((statb.st_mode & 0100) == 0)
830	goto loop;
831	} else if (statb.st_gid == sh_getegid(psh)) {
832	if ((statb.st_mode & 010) == 0)
833	goto loop;
834	} else {
835	if ((statb.st_mode & 01) == 0)
836	goto loop;
837	}
838	#endif
839	TRACE((psh, "searchexec \"%s\" returns \"%s\"\n", name, fullname));
840	INTOFF;
841	if (act & DO_ALTPATH) {
842	stalloc(psh, strlen(fullname) + 1);
843	cmdp = &loc_cmd;
844	} else
845	cmdp = cmdlookup(psh, name, 1);
846	cmdp->cmdtype = CMDNORMAL;
847	cmdp->param.n.index = idx;
848	#ifdef PC_EXE_EXTS
849	cmdp->param.n.suffix = suffix;
850	#else
851	cmdp->param.n.suffix = 0;
852	#endif
853	INTON;
854	goto success;
855	}
856
857	/* We failed. If there was an entry for this command, delete it */
858	if (cmdp)
859	delete_cmd_entry(psh);
860	if (act & DO_ERR)
861	outfmt(psh->out2, "%s: %s\n", name, errmsg(psh, e, E_EXEC));
862	entry->cmdtype = CMDUNKNOWN;
863	return;
864
865	builtin_success:
866	INTOFF;
867	if (act & DO_ALTPATH)
868	cmdp = &loc_cmd;
869	else
870	cmdp = cmdlookup(psh, name, 1);
871	if (cmdp->cmdtype == CMDFUNCTION)
872	/* DO_NOFUNC must have been set */
873	cmdp = &loc_cmd;
874	cmdp->cmdtype = CMDBUILTIN;
875	cmdp->param.bltin = bltin;
876	INTON;
877	success:
878	cmdp->rehash = 0;
879	entry->cmdtype = cmdp->cmdtype;
880	entry->u = cmdp->param;
881	}
882
883
884
885	/*
886	* Search the table of builtin commands.
887	*/
888
889	int
890	(find_builtin(shinstance psh, char name))(shinstance psh, int, char **)
891	{
892	const struct builtincmd *bp;
893
894	for (bp = builtincmd ; bp->name ; bp++) {
895	if (bp->name == name && equal(bp->name, name))
896	return bp->builtin;
897	}
898	return 0;
899	}
900
901	int
902	(find_splbltin(shinstance psh, char name))(shinstance psh, int, char **)
903	{
904	const struct builtincmd *bp;
905
906	for (bp = splbltincmd ; bp->name ; bp++) {
907	if (bp->name == name && equal(bp->name, name))
908	return bp->builtin;
909	}
910	return 0;
911	}
912
913	/*
914	* At shell startup put special builtins into hash table.
915	* ensures they are executed first (see posix).
916	* We stop functions being added with the same name
917	* (as they are impossible to call)
918	*/
919
920	void
921	hash_special_builtins(shinstance *psh)
922	{
923	const struct builtincmd *bp;
924	struct tblentry *cmdp;
925
926	for (bp = splbltincmd ; bp->name ; bp++) {
927	cmdp = cmdlookup(psh, bp->name, 1);
928	cmdp->cmdtype = CMDSPLBLTIN;
929	cmdp->param.bltin = bp->builtin;
930	}
931	}
932
933
934
935	/*
936	* Called when a cd is done. Marks all commands so the next time they
937	* are executed they will be rehashed.
938	*/
939
940	void
941	hashcd(shinstance *psh)
942	{
943	struct tblentry **pp;
944	struct tblentry *cmdp;
945
946	for (pp = psh->cmdtable ; pp < &psh->cmdtable[CMDTABLESIZE] ; pp++) {
947	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
948	if (cmdp->cmdtype == CMDNORMAL
949	\|\| (cmdp->cmdtype == CMDBUILTIN && psh->builtinloc >= 0))
950	cmdp->rehash = 1;
951	}
952	}
953	}
954
955
956
957	/*
958	* Fix command hash table when PATH changed.
959	* Called before PATH is changed. The argument is the new value of PATH;
960	* pathval(psh) still returns the old value at this point.
961	* Called with interrupts off.
962	*/
963
964	void
965	changepath(shinstance psh, const char newval)
966	{
967	const char old, new;
968	int idx;
969	int firstchange;
970	int bltin;
971
972	old = pathval(psh);
973	new = newval;
974	firstchange = 9999; /* assume no change */
975	idx = 0;
976	bltin = -1;
977	for (;;) {
978	if (old != new) {
979	firstchange = idx;
980	#ifdef PC_PATH_SEP
981	if ((old == '\0' && new == ';')
982	\|\| (old == ';' && new == '\0'))
983	#else
984	if ((old == '\0' && new == ':')
985	\|\| (old == ':' && new == '\0'))
986	#endif
987	firstchange++;
988	old = new; /* ignore subsequent differences */
989	}
990	if (*new == '\0')
991	break;
992	if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
993	bltin = idx;
994	#ifdef PC_PATH_SEP
995	if (*new == ';') {
996	#else
997	if (*new == ':') {
998	#endif
999	idx++;
1000	}
1001	new++, old++;
1002	}
1003	if (psh->builtinloc < 0 && bltin >= 0)
1004	psh->builtinloc = bltin; /* zap builtins */
1005	if (psh->builtinloc >= 0 && bltin < 0)
1006	firstchange = 0;
1007	clearcmdentry(psh, firstchange);
1008	psh->builtinloc = bltin;
1009	}
1010
1011
1012	/*
1013	* Clear out command entries. The argument specifies the first entry in
1014	* PATH which has changed.
1015	*/
1016
1017	STATIC void
1018	clearcmdentry(shinstance *psh, int firstchange)
1019	{
1020	struct tblentry **tblp;
1021	struct tblentry **pp;
1022	struct tblentry *cmdp;
1023
1024	INTOFF;
1025	for (tblp = psh->cmdtable ; tblp < &psh->cmdtable[CMDTABLESIZE] ; tblp++) {
1026	pp = tblp;
1027	while ((cmdp = *pp) != NULL) {
1028	if ((cmdp->cmdtype == CMDNORMAL &&
1029	cmdp->param.n.index >= firstchange)
1030	\|\| (cmdp->cmdtype == CMDBUILTIN &&
1031	psh->builtinloc >= firstchange)) {
1032	*pp = cmdp->next;
1033	ckfree(psh, cmdp);
1034	} else {
1035	pp = &cmdp->next;
1036	}
1037	}
1038	}
1039	INTON;
1040	}
1041
1042
1043	/*
1044	* Delete all functions.
1045	*/
1046
1047	#ifdef mkinit
1048	MKINIT void deletefuncs(struct shinstance *);
1049	MKINIT void hash_special_builtins(struct shinstance *);
1050
1051	INIT {
1052	hash_special_builtins(psh);
1053	}
1054
1055	SHELLPROC {
1056	deletefuncs(psh);
1057	}
1058	#endif
1059
1060	void
1061	deletefuncs(shinstance *psh)
1062	{
1063	struct tblentry **tblp;
1064	struct tblentry **pp;
1065	struct tblentry *cmdp;
1066
1067	INTOFF;
1068	for (tblp = psh->cmdtable ; tblp < &psh->cmdtable[CMDTABLESIZE] ; tblp++) {
1069	pp = tblp;
1070	while ((cmdp = *pp) != NULL) {
1071	if (cmdp->cmdtype == CMDFUNCTION) {
1072	*pp = cmdp->next;
1073	freefunc(psh, cmdp->param.func);
1074	ckfree(psh, cmdp);
1075	} else {
1076	pp = &cmdp->next;
1077	}
1078	}
1079	}
1080	INTON;
1081	}
1082
1083
1084
1085	/*
1086	* Locate a command in the command hash table. If "add" is nonzero,
1087	* add the command to the table if it is not already present. The
1088	* variable "lastcmdentry" is set to point to the address of the link
1089	* pointing to the entry, so that delete_cmd_entry can delete the
1090	* entry.
1091	*/
1092
1093	struct tblentry **lastcmdentry;
1094
1095
1096	STATIC struct tblentry *
1097	cmdlookup(shinstance psh, const char name, int add)
1098	{
1099	int hashval;
1100	const char *p;
1101	struct tblentry *cmdp;
1102	struct tblentry **pp;
1103
1104	p = name;
1105	hashval = *p << 4;
1106	while (*p)
1107	hashval += *p++;
1108	hashval &= 0x7FFF;
1109	pp = &psh->cmdtable[hashval % CMDTABLESIZE];
1110	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
1111	if (equal(cmdp->cmdname, name))
1112	break;
1113	pp = &cmdp->next;
1114	}
1115	if (add && cmdp == NULL) {
1116	INTOFF;
1117	cmdp = *pp = ckmalloc(psh, sizeof (struct tblentry) - ARB
1118	+ strlen(name) + 1);
1119	cmdp->next = NULL;
1120	cmdp->cmdtype = CMDUNKNOWN;
1121	cmdp->rehash = 0;
1122	cmdp->param.n.index = 0;
1123	cmdp->param.n.suffix = 0;
1124	strcpy(cmdp->cmdname, name);
1125	INTON;
1126	}
1127	lastcmdentry = pp;
1128	return cmdp;
1129	}
1130
1131	/*
1132	* Delete the command entry returned on the last lookup.
1133	*/
1134
1135	STATIC void
1136	delete_cmd_entry(shinstance *psh)
1137	{
1138	struct tblentry *cmdp;
1139
1140	INTOFF;
1141	cmdp = *lastcmdentry;
1142	*lastcmdentry = cmdp->next;
1143	ckfree(psh, cmdp);
1144	INTON;
1145	}
1146
1147
1148
1149	#ifdef notdef
1150	void
1151	getcmdentry(shinstance psh, char name, struct cmdentry *entry)
1152	{
1153	struct tblentry *cmdp = cmdlookup(psh, name, 0);
1154
1155	if (cmdp) {
1156	entry->u = cmdp->param;
1157	entry->cmdtype = cmdp->cmdtype;
1158	} else {
1159	entry->cmdtype = CMDUNKNOWN;
1160	entry->u.index = 0;
1161	}
1162	}
1163	#endif
1164
1165
1166	/*
1167	* Add a new command entry, replacing any existing command entry for
1168	* the same name - except special builtins.
1169	*/
1170
1171	STATIC void
1172	addcmdentry(shinstance psh, char name, struct cmdentry *entry)
1173	{
1174	struct tblentry *cmdp;
1175
1176	INTOFF;
1177	cmdp = cmdlookup(psh, name, 1);
1178	if (cmdp->cmdtype != CMDSPLBLTIN) {
1179	if (cmdp->cmdtype == CMDFUNCTION) {
1180	freefunc(psh, cmdp->param.func);
1181	}
1182	cmdp->cmdtype = entry->cmdtype;
1183	cmdp->param = entry->u;
1184	}
1185	INTON;
1186	}
1187
1188
1189	/*
1190	* Define a shell function.
1191	*/
1192
1193	void
1194	defun(shinstance psh, char name, union node *func)
1195	{
1196	struct cmdentry entry;
1197
1198	INTOFF;
1199	entry.cmdtype = CMDFUNCTION;
1200	entry.u.func = copyfunc(psh, func);
1201	addcmdentry(psh, name, &entry);
1202	INTON;
1203	}
1204
1205
1206	/*
1207	* Delete a function if it exists.
1208	*/
1209
1210	int
1211	unsetfunc(shinstance psh, char name)
1212	{
1213	struct tblentry *cmdp;
1214
1215	if ((cmdp = cmdlookup(psh, name, 0)) != NULL &&
1216	cmdp->cmdtype == CMDFUNCTION) {
1217	freefunc(psh, cmdp->param.func);
1218	delete_cmd_entry(psh);
1219	return (0);
1220	}
1221	return (1);
1222	}
1223
1224	/*
1225	* Locate and print what a word is...
1226	* also used for 'command -[v\|V]'
1227	*/
1228
1229	int
1230	typecmd(shinstance psh, int argc, char *argv)
1231	{
1232	struct cmdentry entry;
1233	struct tblentry *cmdp;
1234	char * const *pp;
1235	struct alias *ap;
1236	int err = 0;
1237	char *arg;
1238	int c;
1239	int V_flag = 0;
1240	int v_flag = 0;
1241	int p_flag = 0;
1242
1243	while ((c = nextopt(psh, "vVp")) != 0) {
1244	switch (c) {
1245	case 'v': v_flag = 1; break;
1246	case 'V': V_flag = 1; break;
1247	case 'p': p_flag = 1; break;
1248	}
1249	}
1250
1251	if (p_flag && (v_flag \|\| V_flag))
1252	error(psh, "cannot specify -p with -v or -V");
1253
1254	while ((arg = *psh->argptr++)) {
1255	if (!v_flag)
1256	out1str(psh, arg);
1257	/* First look at the keywords */
1258	for (pp = parsekwd; *pp; pp++)
1259	if (*pp == arg && equal(*pp, arg))
1260	break;
1261
1262	if (*pp) {
1263	if (v_flag)
1264	err = 1;
1265	else
1266	out1str(psh, " is a shell keyword\n");
1267	continue;
1268	}
1269
1270	/* Then look at the aliases */
1271	if ((ap = lookupalias(psh, arg, 1)) != NULL) {
1272	if (!v_flag)
1273	out1fmt(psh, " is an alias for \n");
1274	out1fmt(psh, "%s\n", ap->val);
1275	continue;
1276	}
1277
1278	/* Then check if it is a tracked alias */
1279	if ((cmdp = cmdlookup(psh, arg, 0)) != NULL) {
1280	entry.cmdtype = cmdp->cmdtype;
1281	entry.u = cmdp->param;
1282	} else {
1283	/* Finally use brute force */
1284	find_command(psh, arg, &entry, DO_ABS, pathval(psh));
1285	}
1286
1287	switch (entry.cmdtype) {
1288	case CMDNORMAL: {
1289	if (!haspath(arg)) {
1290	const char *path = pathval(psh);
1291	char *name;
1292	int j = entry.u.n.index;
1293	do {
1294	name = padvance(psh, &path, arg);
1295	stunalloc(psh, name);
1296	} while (--j >= 0);
1297	if (!v_flag)
1298	out1fmt(psh, " is%s ",
1299	cmdp ? " a tracked alias for" : "");
1300	#ifdef PC_EXE_EXTS
1301	if ((unsigned)entry.u.n.suffix < K_ELEMENTS(g_exe_suffixes))
1302	out1fmt(psh, "%s%s\n", name, g_exe_suffixes[entry.u.n.suffix]);
1303	else
1304	#endif
1305	out1fmt(psh, "%s\n", name);
1306	} else {
1307	if (shfile_access(&psh->fdtab, arg, X_OK) == 0) {
1308	if (!v_flag)
1309	out1fmt(psh, " is ");
1310	out1fmt(psh, "%s\n", arg);
1311	} else {
1312	if (!v_flag)
1313	out1fmt(psh, ": %s\n",
1314	sh_strerror(psh, errno));
1315	else
1316	err = 126;
1317	}
1318	}
1319	break;
1320	}
1321	case CMDFUNCTION:
1322	if (!v_flag)
1323	out1str(psh, " is a shell function\n");
1324	else
1325	out1fmt(psh, "%s\n", arg);
1326	break;
1327
1328	case CMDBUILTIN:
1329	if (!v_flag)
1330	out1str(psh, " is a shell builtin\n");
1331	else
1332	out1fmt(psh, "%s\n", arg);
1333	break;
1334
1335	case CMDSPLBLTIN:
1336	if (!v_flag)
1337	out1str(psh, " is a special shell builtin\n");
1338	else
1339	out1fmt(psh, "%s\n", arg);
1340	break;
1341
1342	default:
1343	if (!v_flag)
1344	out1str(psh, ": not found\n");
1345	err = 127;
1346	break;
1347	}
1348	}
1349	return err;
1350	}

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source: kBuild/trunk/src/kash/exec.c@ 3505

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