var.c@ 2989

Last change on this file since 2989 was 2641, checked in by bird, 12 years ago
Forgot to remove debug fprintfs.
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File size: 20.1 KB

Line
1	/* $NetBSD: var.c,v 1.36 2004/10/06 10:23:43 enami 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[] = "@(#)var.c 8.3 (Berkeley) 5/4/95";
38	#else
39	__RCSID("$NetBSD: var.c,v 1.36 2004/10/06 10:23:43 enami Exp $");
40	#endif /* not lint */
41	#endif
42
43	#include <stddef.h>
44	#include <stdlib.h>
45	#include <string.h>
46
47	#ifdef PC_OS2_LIBPATHS
48	#define INCL_BASE
49	#include <os2.h>
50
51	#ifndef LIBPATHSTRICT
52	#define LIBPATHSTRICT 3
53	#endif
54
55	extern APIRET
56	#ifdef APIENTRY
57	APIENTRY
58	#endif
59	DosQueryHeaderInfo(HMODULE hmod, ULONG ulIndex, PVOID pvBuffer, ULONG cbBuffer, ULONG ulSubFunction);
60	#define QHINF_EXEINFO 1 /* NE exeinfo. */
61	#define QHINF_READRSRCTBL 2 /* Reads from the resource table. */
62	#define QHINF_READFILE 3 /* Reads from the executable file. */
63	#define QHINF_LIBPATHLENGTH 4 /* Gets the libpath length. */
64	#define QHINF_LIBPATH 5 /* Gets the entire libpath. */
65	#define QHINF_FIXENTRY 6 /* NE only */
66	#define QHINF_STE 7 /* NE only */
67	#define QHINF_MAPSEL 8 /* NE only */
68
69	#endif
70
71
72
73	/*
74	* Shell variables.
75	*/
76
77	#include "shell.h"
78	#include "output.h"
79	#include "expand.h"
80	#include "nodes.h" /* for other headers */
81	#include "eval.h" /* defines cmdenviron */
82	#include "exec.h"
83	#include "syntax.h"
84	#include "options.h"
85	#include "mail.h"
86	#include "var.h"
87	#include "memalloc.h"
88	#include "error.h"
89	#include "mystring.h"
90	#include "parser.h"
91	#include "show.h"
92	#ifndef SMALL
93	# include "myhistedit.h"
94	#endif
95	#include "shinstance.h"
96
97	//#ifdef SMALL
98	//#define VTABSIZE 39
99	//#else
100	//#define VTABSIZE 517
101	//#endif
102
103
104	struct varinit {
105	unsigned var_off;
106	int flags;
107	const char *text;
108	void (func)(shinstance , const char *);
109	};
110
111
112	//#if ATTY
113	//struct var vatty;
114	//#endif
115	//#ifndef SMALL
116	//struct var vhistsize;
117	//struct var vterm;
118	//#endif
119	//struct var vifs;
120	//struct var vmail;
121	//struct var vmpath;
122	//struct var vpath;
123	//#ifdef _MSC_VER
124	//struct var vpath2;
125	//#endif
126	//struct var vps1;
127	//struct var vps2;
128	//struct var vps4;
129	//struct var vvers; - unused
130	//struct var voptind;
131
132	#ifdef PC_OS2_LIBPATHS
133	//static struct var libpath_vars[4];
134	static const char * const libpath_envs[4] = {"LIBPATH=", "BEGINLIBPATH=", "ENDLIBPATH=", "LIBPATHSTRICT="};
135	#endif
136
137	const struct varinit varinit[] = {
138	#if ATTY
139	{ offsetof(shinstance, vatty), VSTRFIXED\|VTEXTFIXED\|VUNSET, "ATTY=",
140	NULL },
141	#endif
142	#ifndef SMALL
143	{ offsetof(shinstance, vhistsize), VSTRFIXED\|VTEXTFIXED\|VUNSET, "HISTSIZE=",
144	sethistsize },
145	#endif
146	{ offsetof(shinstance, vifs), VSTRFIXED\|VTEXTFIXED, "IFS= \t\n",
147	NULL },
148	{ offsetof(shinstance, vmail), VSTRFIXED\|VTEXTFIXED\|VUNSET, "MAIL=",
149	NULL },
150	{ offsetof(shinstance, vmpath), VSTRFIXED\|VTEXTFIXED\|VUNSET, "MAILPATH=",
151	NULL },
152	{ offsetof(shinstance, vpath), VSTRFIXED\|VTEXTFIXED, "PATH=" _PATH_DEFPATH,
153	changepath },
154	/*
155	* vps1 depends on uid
156	*/
157	{ offsetof(shinstance, vps2), VSTRFIXED\|VTEXTFIXED, "PS2=> ",
158	NULL },
159	{ offsetof(shinstance, vps4), VSTRFIXED\|VTEXTFIXED, "PS4=+ ",
160	NULL },
161	#ifndef SMALL
162	{ offsetof(shinstance, vterm), VSTRFIXED\|VTEXTFIXED\|VUNSET, "TERM=",
163	setterm },
164	#endif
165	{ offsetof(shinstance, voptind), VSTRFIXED\|VTEXTFIXED\|VNOFUNC, "OPTIND=1",
166	getoptsreset },
167	{ 0, 0, NULL,
168	NULL }
169	};
170
171	//struct var *vartab[VTABSIZE];
172
173	STATIC int strequal(const char , const char );
174	STATIC struct var find_var(shinstance , const char , struct var *, int );
175
176	/*
177	* Initialize the varable symbol tables and import the environment
178	*/
179
180	#ifdef mkinit
181	INCLUDE "var.h"
182
183	INIT {
184	char **envp;
185
186	initvar(psh);
187	for (envp = sh_environ(psh) ; *envp ; envp++) {
188	if (strchr(*envp, '=')) {
189	setvareq(psh, *envp, VEXPORT\|VTEXTFIXED);
190	}
191	}
192	}
193	#endif
194
195
196	/*
197	* This routine initializes the builtin variables. It is called when the
198	* shell is initialized and again when a shell procedure is spawned.
199	*/
200
201	void
202	initvar(shinstance *psh)
203	{
204	const struct varinit *ip;
205	struct var *vp;
206	struct var **vpp;
207	#ifdef PC_OS2_LIBPATHS
208	char *psz = ckmalloc(psh, 2048);
209	int rc;
210	int i;
211
212	for (i = 0; i < 4; i++)
213	{
214	psh->libpath_vars[i].flags = VSTRFIXED \| VOS2LIBPATH;
215	psh->libpath_vars[i].func = NULL;
216
217	if (i > 0)
218	{
219	psz[0] = psz[1] = psz[2] = psz[3] = '\0';
220	rc = DosQueryExtLIBPATH(psz, i);
221	}
222	else
223	{
224	rc = DosQueryHeaderInfo(NULLHANDLE, 0, psz, 2048, QHINF_LIBPATH);
225	psh->libpath_vars[i].flags \|= VREADONLY;
226	}
227	if (!rc && *psz)
228	{
229	int cch1 = strlen(libpath_envs[i]);
230	int cch2 = strlen(psz) + 1;
231	psh->libpath_vars[i].text = ckmalloc(psh, cch1 + cch2);
232	memcpy(psh->libpath_vars[i].text, libpath_envs[i], cch1);
233	memcpy(psh->libpath_vars[i].text + cch1, psz, cch2);
234	}
235	else
236	{
237	psh->libpath_vars[i].flags \|= VUNSET \| VTEXTFIXED;
238	psh->libpath_vars[i].text = (char*)libpath_envs[i];
239	}
240	if (find_var(psh, psh->libpath_vars[i].text, &vpp, &psh->libpath_vars[i].name_len) != NULL)
241	continue;
242	psh->libpath_vars[i].next = *vpp;
243	*vpp = &psh->libpath_vars[i];
244	}
245	ckfree(psh, psz);
246	#endif
247
248	for (ip = varinit; ip->text; ip++) {
249	vp = (struct var )((char )psh + ip->var_off);
250	if (find_var(psh, ip->text, &vpp, &vp->name_len) != NULL)
251	continue;
252	vp->next = *vpp;
253	*vpp = vp;
254	vp->text = sh_strdup(psh, ip->text);
255	vp->flags = ip->flags;
256	vp->func = ip->func;
257	}
258	/*
259	* PS1 depends on uid
260	*/
261	if (find_var(psh, "PS1", &vpp, &psh->vps1.name_len) == NULL) {
262	psh->vps1.next = *vpp;
263	*vpp = &psh->vps1;
264	#ifdef KBUILD_VERSION_MAJOR
265	psh->vps1.text = sh_strdup(psh, sh_geteuid(psh) ? "PS1=kash$ " : "PS1=kash# ");
266	#else
267	psh->vps1.text = sh_strdup(psh, sh_geteuid(psh) ? "PS1=$ " : "PS1=# ");
268	#endif
269	psh->vps1.flags = VSTRFIXED\|VTEXTFIXED;
270	}
271	}
272
273	/*
274	* Safe version of setvar, returns 1 on success 0 on failure.
275	*/
276
277	int
278	setvarsafe(shinstance psh, const char name, const char *val, int flags)
279	{
280	struct jmploc jmploc;
281	struct jmploc *volatile savehandler = psh->handler;
282	int err = 0;
283	#ifdef __GNUC__
284	(void) &err;
285	#endif
286
287	if (setjmp(jmploc.loc))
288	err = 1;
289	else {
290	psh->handler = &jmploc;
291	setvar(psh, name, val, flags);
292	}
293	psh->handler = savehandler;
294	return err;
295	}
296
297	/*
298	* Set the value of a variable. The flags argument is ored with the
299	* flags of the variable. If val is NULL, the variable is unset.
300	*/
301
302	void
303	setvar(shinstance psh, const char name, const char *val, int flags)
304	{
305	const char *p;
306	const char *q;
307	char *d;
308	size_t len;
309	int namelen;
310	char *nameeq;
311	int isbad;
312
313	isbad = 0;
314	p = name;
315	if (! is_name(*p))
316	isbad = 1;
317	p++;
318	for (;;) {
319	if (! is_in_name(*p)) {
320	if (p == '\0' \|\| p == '=')
321	break;
322	isbad = 1;
323	}
324	p++;
325	}
326	namelen = (int)(p - name);
327	if (isbad)
328	error(psh, "%.*s: bad variable name", namelen, name);
329	len = namelen + 2; /* 2 is space for '=' and '\0' */
330	if (val == NULL) {
331	flags \|= VUNSET;
332	} else {
333	len += strlen(val);
334	}
335	d = nameeq = ckmalloc(psh, len);
336	q = name;
337	while (--namelen >= 0)
338	d++ = q++;
339	*d++ = '=';
340	*d = '\0';
341	if (val)
342	scopy(val, d);
343	setvareq(psh, nameeq, flags);
344	}
345
346
347
348	/*
349	* Same as setvar except that the variable and value are passed in
350	* the first argument as name=value. Since the first argument will
351	* be actually stored in the table, it should not be a string that
352	* will go away.
353	*/
354
355	void
356	setvareq(shinstance psh, char s, int flags)
357	{
358	struct var vp, *vpp;
359	int nlen;
360
361	#if defined(_MSC_VER) \|\| defined(_WIN32)
362	/* On Windows PATH is often spelled 'Path', correct this here. */
363	if ( s[0] == 'P'
364	&& s[1] == 'a'
365	&& s[2] == 't'
366	&& s[3] == 'h'
367	&& (s[4] == '\0' \|\| s[4] == '=') ) {
368	s[1] = 'A';
369	s[2] = 'T';
370	s[3] = 'H';
371	}
372	#endif
373
374	if (aflag(psh))
375	flags \|= VEXPORT;
376	vp = find_var(psh, s, &vpp, &nlen);
377	if (vp != NULL) {
378	if (vp->flags & VREADONLY)
379	error(psh, "%.*s: is read only", vp->name_len, s);
380	if (flags & VNOSET)
381	return;
382	INTOFF;
383
384	if (vp->func && (flags & VNOFUNC) == 0)
385	(*vp->func)(psh, s + vp->name_len + 1);
386
387	if ((vp->flags & (VTEXTFIXED\|VSTACK)) == 0)
388	ckfree(psh, vp->text);
389
390	vp->flags &= ~(VTEXTFIXED\|VSTACK\|VUNSET);
391	vp->flags \|= flags & ~VNOFUNC;
392	vp->text = s;
393	#ifdef PC_OS2_LIBPATHS
394	if ((vp->flags & VOS2LIBPATH) && (vp->flags & VEXPORT))
395	vp->flags &= ~VEXPORT;
396	#endif
397
398	/*
399	* We could roll this to a function, to handle it as
400	* a regular variable function callback, but why bother?
401	*/
402	if (vp == &psh->vmpath \|\| (vp == &psh->vmail && ! mpathset(psh)))
403	chkmail(psh, 1);
404	INTON;
405	return;
406	}
407	/* not found */
408	if (flags & VNOSET)
409	return;
410
411	vp = ckmalloc(psh, sizeof (*vp));
412	vp->flags = flags & ~VNOFUNC;
413	vp->text = s;
414	vp->name_len = nlen;
415	vp->next = *vpp;
416	vp->func = NULL;
417	*vpp = vp;
418	}
419
420
421
422	/*
423	* Process a linked list of variable assignments.
424	*/
425
426	void
427	listsetvar(shinstance psh, struct strlist list, int flags)
428	{
429	struct strlist *lp;
430
431	INTOFF;
432	for (lp = list ; lp ; lp = lp->next) {
433	setvareq(psh, savestr(psh, lp->text), flags);
434	}
435	INTON;
436	}
437
438	void
439	listmklocal(shinstance psh, struct strlist list, int flags)
440	{
441	struct strlist *lp;
442
443	for (lp = list ; lp ; lp = lp->next)
444	mklocal(psh, lp->text, flags);
445	}
446
447
448	/*
449	* Find the value of a variable. Returns NULL if not set.
450	*/
451
452	char *
453	lookupvar(shinstance psh, const char name)
454	{
455	struct var *v;
456
457	v = find_var(psh, name, NULL, NULL);
458	if (v == NULL \|\| v->flags & VUNSET)
459	return NULL;
460	return v->text + v->name_len + 1;
461	}
462
463
464
465	/*
466	* Search the environment of a builtin command. If the second argument
467	* is nonzero, return the value of a variable even if it hasn't been
468	* exported.
469	*/
470
471	char *
472	bltinlookup(shinstance psh, const char name, int doall)
473	{
474	struct strlist *sp;
475	struct var *v;
476
477	for (sp = psh->cmdenviron ; sp ; sp = sp->next) {
478	if (strequal(sp->text, name))
479	return strchr(sp->text, '=') + 1;
480	}
481
482	v = find_var(psh, name, NULL, NULL);
483
484	if (v == NULL \|\| v->flags & VUNSET \|\| (!doall && !(v->flags & VEXPORT)))
485	return NULL;
486	return v->text + v->name_len + 1;
487	}
488
489
490
491	/*
492	* Generate a list of exported variables. This routine is used to construct
493	* the third argument to execve when executing a program.
494	*/
495
496	char **
497	environment(shinstance *psh)
498	{
499	int nenv;
500	struct var **vpp;
501	struct var *vp;
502	char **env;
503	char **ep;
504
505	nenv = 0;
506	for (vpp = psh->vartab ; vpp < psh->vartab + VTABSIZE ; vpp++) {
507	for (vp = *vpp ; vp ; vp = vp->next)
508	if (vp->flags & VEXPORT)
509	nenv++;
510	}
511	ep = env = stalloc(psh, (nenv + 1) * sizeof *env);
512	for (vpp = psh->vartab ; vpp < psh->vartab + VTABSIZE ; vpp++) {
513	for (vp = *vpp ; vp ; vp = vp->next)
514	if (vp->flags & VEXPORT)
515	*ep++ = vp->text;
516	}
517	*ep = NULL;
518
519	#ifdef PC_OS2_LIBPATHS
520	/*
521	* Set the libpaths now as this is exec() time.
522	*/
523	for (nenv = 0; nenv < 3; nenv++)
524	DosSetExtLIBPATH(strchr(psh->libpath_vars[nenv].text, '=') + 1, nenv);
525	#endif
526
527	return env;
528	}
529
530
531	/*
532	* Called when a shell procedure is invoked to clear out nonexported
533	* variables. It is also necessary to reallocate variables of with
534	* VSTACK set since these are currently allocated on the stack.
535	*/
536
537	#ifdef mkinit
538	void shprocvar(shinstance *psh);
539
540	SHELLPROC {
541	shprocvar(psh);
542	}
543	#endif
544
545	void
546	shprocvar(shinstance *psh)
547	{
548	struct var **vpp;
549	struct var vp, *prev;
550
551	for (vpp = psh->vartab ; vpp < psh->vartab + VTABSIZE ; vpp++) {
552	for (prev = vpp ; (vp = *prev) != NULL ; ) {
553	if ((vp->flags & VEXPORT) == 0) {
554	*prev = vp->next;
555	if ((vp->flags & VTEXTFIXED) == 0)
556	ckfree(psh, vp->text);
557	if ((vp->flags & VSTRFIXED) == 0)
558	ckfree(psh, vp);
559	} else {
560	if (vp->flags & VSTACK) {
561	vp->text = savestr(psh, vp->text);
562	vp->flags &=~ VSTACK;
563	}
564	prev = &vp->next;
565	}
566	}
567	}
568	initvar(psh);
569	}
570
571
572
573	/*
574	* Command to list all variables which are set. Currently this command
575	* is invoked from the set command when the set command is called without
576	* any variables.
577	*/
578
579	void
580	print_quoted(shinstance psh, const char p)
581	{
582	const char *q;
583
584	if (strcspn(p, "\|&;<>()$`\\\"' \t\n*?[]#~=%") == strlen(p)) {
585	out1fmt(psh, "%s", p);
586	return;
587	}
588	while (*p) {
589	if (*p == '\'') {
590	out1fmt(psh, "\\'");
591	p++;
592	continue;
593	}
594	q = strchr(p, '\'');
595	if (!q) {
596	out1fmt(psh, "'%s'", p );
597	return;
598	}
599	out1fmt(psh, "'%.*s'", (int)(q - p), p );
600	p = q;
601	}
602	}
603
604	static int
605	sort_var(const void v_v1, const void v_v2)
606	{
607	const struct var * const *v1 = v_v1;
608	const struct var * const *v2 = v_v2;
609
610	/* XXX Will anyone notice we include the '=' of the shorter name? */
611	return strcoll((v1)->text, (v2)->text);
612	}
613
614	/*
615	* POSIX requires that 'set' (but not export or readonly) output the
616	* variables in lexicographic order - by the locale's collating order (sigh).
617	* Maybe we could keep them in an ordered balanced binary tree
618	* instead of hashed lists.
619	* For now just roll 'em through qsort for printing...
620	*/
621
622	int
623	showvars(shinstance psh, const char name, int flag, int show_value)
624	{
625	struct var **vpp;
626	struct var *vp;
627	const char *p;
628
629	static struct var *list; / static in case we are interrupted */
630	static int list_len;
631	int count = 0;
632
633	if (!list) {
634	list_len = 32;
635	list = ckmalloc(psh, list_len * sizeof(*list));
636	}
637
638	for (vpp = psh->vartab ; vpp < psh->vartab + VTABSIZE ; vpp++) {
639	for (vp = *vpp ; vp ; vp = vp->next) {
640	if (flag && !(vp->flags & flag))
641	continue;
642	if (vp->flags & VUNSET && !(show_value & 2))
643	continue;
644	if (count >= list_len) {
645	list = ckrealloc(psh, list,
646	(list_len << 1) * sizeof(*list));
647	list_len <<= 1;
648	}
649	list[count++] = vp;
650	}
651	}
652
653	qsort(list, count, sizeof(*list), sort_var);
654
655	for (vpp = list; count--; vpp++) {
656	vp = *vpp;
657	if (name)
658	out1fmt(psh, "%s ", name);
659	for (p = vp->text ; *p != '=' ; p++)
660	out1c(psh, *p);
661	if (!(vp->flags & VUNSET) && show_value) {
662	out1fmt(psh, "=");
663	print_quoted(psh, ++p);
664	}
665	out1c(psh, '\n');
666	}
667	return 0;
668	}
669
670
671
672	/*
673	* The export and readonly commands.
674	*/
675
676	int
677	exportcmd(shinstance psh, int argc, char *argv)
678	{
679	struct var *vp;
680	char *name;
681	const char *p;
682	int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
683	int pflag;
684
685	pflag = nextopt(psh, "p") == 'p' ? 3 : 0;
686	if (argc <= 1 \|\| pflag) {
687	showvars(psh, pflag ? argv[0] : 0, flag, pflag );
688	return 0;
689	}
690
691	while ((name = *psh->argptr++) != NULL) {
692	if ((p = strchr(name, '=')) != NULL) {
693	p++;
694	} else {
695	vp = find_var(psh, name, NULL, NULL);
696	if (vp != NULL) {
697	vp->flags \|= flag;
698	continue;
699	}
700	}
701	setvar(psh, name, p, flag);
702	}
703	return 0;
704	}
705
706
707	/*
708	* The "local" command.
709	*/
710
711	int
712	localcmd(shinstance psh, int argc, char *argv)
713	{
714	char *name;
715
716	if (! in_function(psh))
717	error(psh, "Not in a function");
718	while ((name = *psh->argptr++) != NULL) {
719	mklocal(psh, name, 0);
720	}
721	return 0;
722	}
723
724
725	/*
726	* Make a variable a local variable. When a variable is made local, it's
727	* value and flags are saved in a localvar structure. The saved values
728	* will be restored when the shell function returns. We handle the name
729	* "-" as a special case.
730	*/
731
732	void
733	mklocal(shinstance psh, const char name, int flags)
734	{
735	struct localvar *lvp;
736	struct var **vpp;
737	struct var *vp;
738
739	INTOFF;
740	lvp = ckmalloc(psh, sizeof (struct localvar));
741	if (name[0] == '-' && name[1] == '\0') {
742	char *p;
743	p = ckmalloc(psh, sizeof_optlist);
744	lvp->text = memcpy(p, psh->optlist, sizeof_optlist);
745	vp = NULL;
746	} else {
747	vp = find_var(psh, name, &vpp, NULL);
748	if (vp == NULL) {
749	if (strchr(name, '='))
750	setvareq(psh, savestr(psh, name), VSTRFIXED\|flags);
751	else
752	setvar(psh, name, NULL, VSTRFIXED\|flags);
753	vp = vpp; / the new variable */
754	lvp->text = NULL;
755	lvp->flags = VUNSET;
756	} else {
757	lvp->text = vp->text;
758	lvp->flags = vp->flags;
759	vp->flags \|= VSTRFIXED\|VTEXTFIXED;
760	if (name[vp->name_len] == '=')
761	setvareq(psh, savestr(psh, name), flags);
762	}
763	}
764	lvp->vp = vp;
765	lvp->next = psh->localvars;
766	psh->localvars = lvp;
767	INTON;
768	}
769
770
771	/*
772	* Called after a function returns.
773	*/
774
775	void
776	poplocalvars(shinstance *psh)
777	{
778	struct localvar *lvp;
779	struct var *vp;
780
781	while ((lvp = psh->localvars) != NULL) {
782	psh->localvars = lvp->next;
783	vp = lvp->vp;
784	TRACE((psh, "poplocalvar %s", vp ? vp->text : "-"));
785	if (vp == NULL) { /* $- saved */
786	memcpy(psh->optlist, lvp->text, sizeof_optlist);
787	ckfree(psh, lvp->text);
788	} else if ((lvp->flags & (VUNSET\|VSTRFIXED)) == VUNSET) {
789	(void)unsetvar(psh, vp->text, 0);
790	} else {
791	if (vp->func && (vp->flags & VNOFUNC) == 0)
792	(*vp->func)(psh, lvp->text + vp->name_len + 1);
793	if ((vp->flags & VTEXTFIXED) == 0)
794	ckfree(psh, vp->text);
795	vp->flags = lvp->flags;
796	vp->text = lvp->text;
797	}
798	ckfree(psh, lvp);
799	}
800	}
801
802
803	int
804	setvarcmd(shinstance psh, int argc, char *argv)
805	{
806	if (argc <= 2)
807	return unsetcmd(psh, argc, argv);
808	else if (argc == 3)
809	setvar(psh, argv[1], argv[2], 0);
810	else
811	error(psh, "List assignment not implemented");
812	return 0;
813	}
814
815
816	/*
817	* The unset builtin command. We unset the function before we unset the
818	* variable to allow a function to be unset when there is a readonly variable
819	* with the same name.
820	*/
821
822	int
823	unsetcmd(shinstance psh, int argc, char *argv)
824	{
825	char **ap;
826	int i;
827	int flg_func = 0;
828	int flg_var = 0;
829	int ret = 0;
830
831	while ((i = nextopt(psh, "evf")) != '\0') {
832	if (i == 'f')
833	flg_func = 1;
834	else
835	flg_var = i;
836	}
837	if (flg_func == 0 && flg_var == 0)
838	flg_var = 1;
839
840	for (ap = psh->argptr; *ap ; ap++) {
841	if (flg_func)
842	ret \|= unsetfunc(psh, *ap);
843	if (flg_var)
844	ret \|= unsetvar(psh, *ap, flg_var == 'e');
845	}
846	return ret;
847	}
848
849
850	/*
851	* Unset the specified variable.
852	*/
853
854	int
855	unsetvar(shinstance psh, const char s, int unexport)
856	{
857	struct var **vpp;
858	struct var *vp;
859
860	vp = find_var(psh, s, &vpp, NULL);
861	if (vp == NULL)
862	return 1;
863
864	if (vp->flags & VREADONLY)
865	return (1);
866
867	INTOFF;
868	if (unexport) {
869	vp->flags &= ~VEXPORT;
870	} else {
871	if (vp->text[vp->name_len + 1] != '\0')
872	setvar(psh, s, nullstr, 0);
873	vp->flags &= ~VEXPORT;
874	vp->flags \|= VUNSET;
875	if ((vp->flags & VSTRFIXED) == 0) {
876	if ((vp->flags & VTEXTFIXED) == 0)
877	ckfree(psh, vp->text);
878	*vpp = vp->next;
879	ckfree(psh, vp);
880	}
881	}
882	INTON;
883	return 0;
884	}
885
886
887	/*
888	* Returns true if the two strings specify the same varable. The first
889	* variable name is terminated by '='; the second may be terminated by
890	* either '=' or '\0'.
891	*/
892
893	STATIC int
894	strequal(const char p, const char q)
895	{
896	while (p == q++) {
897	if (*p++ == '=')
898	return 1;
899	}
900	if (p == '=' && (q - 1) == '\0')
901	return 1;
902	return 0;
903	}
904
905	/*
906	* Search for a variable.
907	* 'name' may be terminated by '=' or a NUL.
908	* vppp is set to the pointer to vp, or the list head if vp isn't found
909	* lenp is set to the number of charactets in 'name'
910	*/
911
912	STATIC struct var *
913	find_var(shinstance psh, const char name, struct var **vppp, int lenp)
914	{
915	unsigned int hashval;
916	int len;
917	struct var vp, *vpp;
918	const char *p = name;
919
920	hashval = 0;
921	while (p && p != '=')
922	hashval = 2 * hashval + (unsigned char)*p++;
923	len = (int)(p - name);
924
925	if (lenp)
926	*lenp = len;
927	vpp = &psh->vartab[hashval % VTABSIZE];
928	if (vppp)
929	*vppp = vpp;
930
931	for (vp = vpp ; vp ; vpp = &vp->next, vp = vpp) {
932	if (vp->name_len != len)
933	continue;
934	if (memcmp(vp->text, name, len) != 0)
935	continue;
936	if (vppp)
937	*vppp = vpp;
938	return vp;
939	}
940	return NULL;
941	}

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source: kBuild/trunk/src/kash/var.c@ 2989

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