Reduce lock contention for simple cases in stdtime.
[dragonfly.git] / bin / sh / var.c
CommitLineData
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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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
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35 *
36 * @(#)var.c 8.3 (Berkeley) 5/4/95
37 * $FreeBSD: src/bin/sh/var.c,v 1.15.2.2 2002/08/27 01:36:28 tjr Exp $
f2aa3fa5 38 * $DragonFly: src/bin/sh/var.c,v 1.15 2007/01/14 17:29:58 pavalos Exp $
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39 */
40
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41#include <unistd.h>
42#include <stdlib.h>
43
44/*
45 * Shell variables.
46 */
47
48#include <locale.h>
6a25bb17 49#include <paths.h>
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50
51#include "shell.h"
52#include "output.h"
53#include "expand.h"
54#include "nodes.h" /* for other headers */
55#include "eval.h" /* defines cmdenviron */
56#include "exec.h"
57#include "syntax.h"
58#include "options.h"
59#include "mail.h"
60#include "var.h"
61#include "memalloc.h"
62#include "error.h"
63#include "mystring.h"
64#include "parser.h"
65#ifndef NO_HISTORY
66#include "myhistedit.h"
67#endif
68
69
70#define VTABSIZE 39
71
72
73struct varinit {
74 struct var *var;
75 int flags;
934863d7 76 const char *text;
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77 void (*func)(const char *);
78};
79
80
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81#ifndef NO_HISTORY
82struct var vhistsize;
83#endif
84struct var vifs;
85struct var vmail;
86struct var vmpath;
87struct var vpath;
88struct var vppid;
89struct var vps1;
90struct var vps2;
0d5aaed6 91struct var vps4;
984263bc 92struct var vvers;
f8903466 93STATIC struct var voptind;
984263bc 94
f8903466 95STATIC const struct varinit varinit[] = {
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96#ifndef NO_HISTORY
97 { &vhistsize, VSTRFIXED|VTEXTFIXED|VUNSET, "HISTSIZE=",
98 sethistsize },
99#endif
100 { &vifs, VSTRFIXED|VTEXTFIXED, "IFS= \t\n",
101 NULL },
102 { &vmail, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL=",
103 NULL },
104 { &vmpath, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH=",
105 NULL },
3efac031 106 { &vpath, VSTRFIXED|VTEXTFIXED|VEXPORT,
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107#ifdef _PATH_DEFPATH
108 "PATH=" _PATH_DEFPATH,
109#else
110 "PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/pkg/bin:/usr/pkg/sbin",
111#endif
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112 changepath },
113 { &vppid, VSTRFIXED|VTEXTFIXED|VUNSET, "PPID=",
114 NULL },
115 /*
116 * vps1 depends on uid
117 */
118 { &vps2, VSTRFIXED|VTEXTFIXED, "PS2=> ",
119 NULL },
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120 { &vps4, VSTRFIXED|VTEXTFIXED, "PS4=+ ",
121 NULL },
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122 { &voptind, VSTRFIXED|VTEXTFIXED, "OPTIND=1",
123 getoptsreset },
124 { NULL, 0, NULL,
125 NULL }
126};
127
f8903466 128STATIC struct var *vartab[VTABSIZE];
984263bc 129
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130STATIC struct var **hashvar(const char *);
131STATIC int varequal(const char *, const char *);
132STATIC int localevar(const char *);
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133
134/*
492efe05 135 * Initialize the variable symbol tables and import the environment.
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136 */
137
138#ifdef mkinit
139INCLUDE "var.h"
934863d7 140MKINIT char **environ;
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141INIT {
142 char **envp;
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143
144 initvar();
145 for (envp = environ ; *envp ; envp++) {
146 if (strchr(*envp, '=')) {
147 setvareq(*envp, VEXPORT|VTEXTFIXED);
148 }
149 }
150}
151#endif
152
153
154/*
155 * This routine initializes the builtin variables. It is called when the
156 * shell is initialized and again when a shell procedure is spawned.
157 */
158
159void
160initvar(void)
161{
162 char ppid[20];
163 const struct varinit *ip;
164 struct var *vp;
165 struct var **vpp;
166
167 for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
168 if ((vp->flags & VEXPORT) == 0) {
169 vpp = hashvar(ip->text);
170 vp->next = *vpp;
171 *vpp = vp;
934863d7 172 vp->text = strdup(ip->text);
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173 vp->flags = ip->flags;
174 vp->func = ip->func;
175 }
176 }
177 /*
178 * PS1 depends on uid
179 */
180 if ((vps1.flags & VEXPORT) == 0) {
181 vpp = hashvar("PS1=");
182 vps1.next = *vpp;
183 *vpp = &vps1;
934863d7 184 vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
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185 vps1.flags = VSTRFIXED|VTEXTFIXED;
186 }
187 if ((vppid.flags & VEXPORT) == 0) {
188 fmtstr(ppid, sizeof(ppid), "%d", (int)getppid());
189 setvarsafe("PPID", ppid, 0);
190 }
191}
192
193/*
194 * Safe version of setvar, returns 1 on success 0 on failure.
195 */
196
197int
492efe05 198setvarsafe(const char *name, const char *val, int flags)
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199{
200 struct jmploc jmploc;
201 struct jmploc *volatile savehandler = handler;
202 int err = 0;
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203
204 if (setjmp(jmploc.loc))
205 err = 1;
206 else {
207 handler = &jmploc;
208 setvar(name, val, flags);
209 }
210 handler = savehandler;
211 return err;
212}
213
214/*
fab926b5 215 * Set the value of a variable. The flags argument is stored with the
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216 * flags of the variable. If val is NULL, the variable is unset.
217 */
218
219void
492efe05 220setvar(const char *name, const char *val, int flags)
984263bc 221{
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222 const char *cp;
223 char *p;
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224 int len;
225 int namelen;
226 char *nameeq;
227 int isbad;
228
229 isbad = 0;
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230 cp = name;
231 if (!is_name(*cp))
984263bc 232 isbad = 1;
492efe05 233 cp++;
984263bc 234 for (;;) {
492efe05
CP
235 if (!is_in_name(*cp)) {
236 if (*cp == '\0' || *cp == '=')
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237 break;
238 isbad = 1;
239 }
492efe05 240 cp++;
984263bc 241 }
492efe05 242 namelen = cp - name;
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243 if (isbad)
244 error("%.*s: bad variable name", namelen, name);
245 len = namelen + 2; /* 2 is space for '=' and '\0' */
246 if (val == NULL) {
247 flags |= VUNSET;
248 } else {
249 len += strlen(val);
250 }
251 p = nameeq = ckmalloc(len);
492efe05 252 cp = name;
984263bc 253 while (--namelen >= 0)
492efe05 254 *p++ = *cp++;
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255 *p++ = '=';
256 *p = '\0';
257 if (val)
258 scopy(val, p);
259 setvareq(nameeq, flags);
260}
261
262STATIC int
492efe05 263localevar(const char *s)
984263bc 264{
492efe05 265 static const char * const lnames[7] = {
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266 "ALL", "COLLATE", "CTYPE", "MONETARY",
267 "NUMERIC", "TIME", NULL
268 };
492efe05 269 const char * const *ss;
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270
271 if (*s != 'L')
272 return 0;
273 if (varequal(s + 1, "ANG"))
274 return 1;
275 if (strncmp(s + 1, "C_", 2) != 0)
276 return 0;
277 for (ss = lnames; *ss ; ss++)
278 if (varequal(s + 3, *ss))
279 return 1;
280 return 0;
281}
282
283/*
284 * Same as setvar except that the variable and value are passed in
285 * the first argument as name=value. Since the first argument will
286 * be actually stored in the table, it should not be a string that
287 * will go away.
288 */
289
290void
291setvareq(char *s, int flags)
292{
293 struct var *vp, **vpp;
294 int len;
295
296 if (aflag)
297 flags |= VEXPORT;
298 vpp = hashvar(s);
299 for (vp = *vpp ; vp ; vp = vp->next) {
300 if (varequal(s, vp->text)) {
301 if (vp->flags & VREADONLY) {
302 len = strchr(s, '=') - s;
303 error("%.*s: is read only", len, s);
304 }
305 INTOFF;
306
307 if (vp->func && (flags & VNOFUNC) == 0)
308 (*vp->func)(strchr(s, '=') + 1);
309
310 if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
311 ckfree(vp->text);
312
313 vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
314 vp->flags |= flags;
315 vp->text = s;
316
317 /*
318 * We could roll this to a function, to handle it as
319 * a regular variable function callback, but why bother?
320 */
321 if (vp == &vmpath || (vp == &vmail && ! mpathset()))
322 chkmail(1);
323 if ((vp->flags & VEXPORT) && localevar(s)) {
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324 if (putenv(s) != 0)
325 error("putenv: cannot set %s", s);
57fed2af 326 setlocale(LC_ALL, "");
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327 }
328 INTON;
329 return;
330 }
331 }
332 /* not found */
333 vp = ckmalloc(sizeof (*vp));
334 vp->flags = flags;
335 vp->text = s;
336 vp->next = *vpp;
337 vp->func = NULL;
338 INTOFF;
339 *vpp = vp;
340 if ((vp->flags & VEXPORT) && localevar(s)) {
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341 if (putenv(s) != 0)
342 error("putenv: cannot set %s", s);
57fed2af 343 setlocale(LC_ALL, "");
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344 }
345 INTON;
346}
347
348
349
350/*
351 * Process a linked list of variable assignments.
352 */
353
354void
355listsetvar(struct strlist *list)
356{
357 struct strlist *lp;
358
359 INTOFF;
360 for (lp = list ; lp ; lp = lp->next) {
361 setvareq(savestr(lp->text), 0);
362 }
363 INTON;
364}
365
366
367
368/*
369 * Find the value of a variable. Returns NULL if not set.
370 */
371
372char *
492efe05 373lookupvar(const char *name)
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374{
375 struct var *v;
376
377 for (v = *hashvar(name) ; v ; v = v->next) {
378 if (varequal(v->text, name)) {
379 if (v->flags & VUNSET)
380 return NULL;
381 return strchr(v->text, '=') + 1;
382 }
383 }
384 return NULL;
385}
386
387
388
389/*
390 * Search the environment of a builtin command. If the second argument
391 * is nonzero, return the value of a variable even if it hasn't been
392 * exported.
393 */
394
395char *
492efe05 396bltinlookup(const char *name, int doall)
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397{
398 struct strlist *sp;
399 struct var *v;
400
401 for (sp = cmdenviron ; sp ; sp = sp->next) {
402 if (varequal(sp->text, name))
403 return strchr(sp->text, '=') + 1;
404 }
405 for (v = *hashvar(name) ; v ; v = v->next) {
406 if (varequal(v->text, name)) {
407 if ((v->flags & VUNSET)
408 || (!doall && (v->flags & VEXPORT) == 0))
409 return NULL;
410 return strchr(v->text, '=') + 1;
411 }
412 }
413 return NULL;
414}
415
416
417
418/*
419 * Generate a list of exported variables. This routine is used to construct
420 * the third argument to execve when executing a program.
421 */
422
423char **
424environment(void)
425{
426 int nenv;
427 struct var **vpp;
428 struct var *vp;
429 char **env, **ep;
430
431 nenv = 0;
432 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
433 for (vp = *vpp ; vp ; vp = vp->next)
434 if (vp->flags & VEXPORT)
435 nenv++;
436 }
437 ep = env = stalloc((nenv + 1) * sizeof *env);
438 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
439 for (vp = *vpp ; vp ; vp = vp->next)
440 if (vp->flags & VEXPORT)
441 *ep++ = vp->text;
442 }
443 *ep = NULL;
444 return env;
445}
446
447
448/*
449 * Called when a shell procedure is invoked to clear out nonexported
450 * variables. It is also necessary to reallocate variables of with
451 * VSTACK set since these are currently allocated on the stack.
452 */
453
454#ifdef mkinit
934863d7 455void shprocvar(void);
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456
457SHELLPROC {
458 shprocvar();
459}
460#endif
461
462void
463shprocvar(void)
464{
465 struct var **vpp;
466 struct var *vp, **prev;
467
468 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
469 for (prev = vpp ; (vp = *prev) != NULL ; ) {
470 if ((vp->flags & VEXPORT) == 0) {
471 *prev = vp->next;
472 if ((vp->flags & VTEXTFIXED) == 0)
473 ckfree(vp->text);
474 if ((vp->flags & VSTRFIXED) == 0)
475 ckfree(vp);
476 } else {
477 if (vp->flags & VSTACK) {
478 vp->text = savestr(vp->text);
479 vp->flags &=~ VSTACK;
480 }
481 prev = &vp->next;
482 }
483 }
484 }
485 initvar();
486}
487
488
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489static int
490var_compare(const void *a, const void *b)
491{
492 const char *const *sa, *const *sb;
493
494 sa = a;
495 sb = b;
496 /*
497 * This compares two var=value strings which creates a different
498 * order from what you would probably expect. POSIX is somewhat
499 * ambiguous on what should be sorted exactly.
500 */
501 return strcoll(*sa, *sb);
502}
503
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504
505/*
506 * Command to list all variables which are set. Currently this command
507 * is invoked from the set command when the set command is called without
508 * any variables.
509 */
510
511int
512showvarscmd(int argc __unused, char **argv __unused)
513{
514 struct var **vpp;
515 struct var *vp;
516 const char *s;
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517 const char **vars;
518 int i, n;
984263bc 519
fab926b5
PA
520 /*
521 * POSIX requires us to sort the variables.
522 */
523 n = 0;
524 for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) {
525 for (vp = *vpp; vp; vp = vp->next) {
526 if (!(vp->flags & VUNSET))
527 n++;
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528 }
529 }
fab926b5
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530
531 INTON;
532 vars = ckmalloc(n * sizeof(*vars));
533 i = 0;
534 for (vpp = vartab; vpp < vartab + VTABSIZE; vpp++) {
535 for (vp = *vpp; vp; vp = vp->next) {
536 if (!(vp->flags & VUNSET))
537 vars[i++] = vp->text;
538 }
539 }
540
541 qsort(vars, n, sizeof(*vars), var_compare);
542 for (i = 0; i < n; i++) {
543 for (s = vars[i]; *s != '='; s++)
544 out1c(*s);
545 out1c('=');
546 out1qstr(s + 1);
547 out1c('\n');
548 }
549 ckfree(vars);
550 INTOFF;
551
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552 return 0;
553}
554
555
556
557/*
558 * The export and readonly commands.
559 */
560
561int
562exportcmd(int argc, char **argv)
563{
564 struct var **vpp;
565 struct var *vp;
566 char *name;
567 char *p;
568 char *cmdname;
569 int ch, values;
570 int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
571
572 cmdname = argv[0];
573 optreset = optind = 1;
574 opterr = 0;
575 values = 0;
576 while ((ch = getopt(argc, argv, "p")) != -1) {
577 switch (ch) {
578 case 'p':
579 values = 1;
580 break;
581 case '?':
582 default:
583 error("unknown option: -%c", optopt);
584 }
585 }
586 argc -= optind;
587 argv += optind;
588
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589 if (values && argc != 0)
590 error("-p requires no arguments");
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591 listsetvar(cmdenviron);
592 if (argc != 0) {
fab926b5 593 while ((name = *argv++) != NULL) {
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594 if ((p = strchr(name, '=')) != NULL) {
595 p++;
596 } else {
597 vpp = hashvar(name);
598 for (vp = *vpp ; vp ; vp = vp->next) {
599 if (varequal(vp->text, name)) {
600
601 vp->flags |= flag;
602 if ((vp->flags & VEXPORT) && localevar(vp->text)) {
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603 if (putenv(vp->text) != 0)
604 error("putenv: cannot set %s", vp->text);
57fed2af 605 setlocale(LC_ALL, "");
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606 }
607 goto found;
608 }
609 }
610 }
611 setvar(name, p, flag);
612found:;
613 }
614 } else {
615 for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
616 for (vp = *vpp ; vp ; vp = vp->next) {
617 if (vp->flags & flag) {
618 if (values) {
619 out1str(cmdname);
620 out1c(' ');
621 }
622 for (p = vp->text ; *p != '=' ; p++)
623 out1c(*p);
624 if (values && !(vp->flags & VUNSET)) {
625 out1c('=');
626 out1qstr(p + 1);
627 }
628 out1c('\n');
629 }
630 }
631 }
632 }
633 return 0;
634}
635
636
637/*
638 * The "local" command.
639 */
640
641int
642localcmd(int argc __unused, char **argv __unused)
643{
644 char *name;
645
646 if (! in_function())
647 error("Not in a function");
648 while ((name = *argptr++) != NULL) {
649 mklocal(name);
650 }
651 return 0;
652}
653
654
655/*
656 * Make a variable a local variable. When a variable is made local, it's
657 * value and flags are saved in a localvar structure. The saved values
658 * will be restored when the shell function returns. We handle the name
659 * "-" as a special case.
660 */
661
662void
663mklocal(char *name)
664{
665 struct localvar *lvp;
666 struct var **vpp;
667 struct var *vp;
668
669 INTOFF;
670 lvp = ckmalloc(sizeof (struct localvar));
671 if (name[0] == '-' && name[1] == '\0') {
672 lvp->text = ckmalloc(sizeof optlist);
673 memcpy(lvp->text, optlist, sizeof optlist);
674 vp = NULL;
675 } else {
676 vpp = hashvar(name);
677 for (vp = *vpp ; vp && ! varequal(vp->text, name) ; vp = vp->next);
678 if (vp == NULL) {
679 if (strchr(name, '='))
680 setvareq(savestr(name), VSTRFIXED);
681 else
682 setvar(name, NULL, VSTRFIXED);
683 vp = *vpp; /* the new variable */
684 lvp->text = NULL;
685 lvp->flags = VUNSET;
686 } else {
687 lvp->text = vp->text;
688 lvp->flags = vp->flags;
689 vp->flags |= VSTRFIXED|VTEXTFIXED;
690 if (strchr(name, '='))
691 setvareq(savestr(name), 0);
692 }
693 }
694 lvp->vp = vp;
695 lvp->next = localvars;
696 localvars = lvp;
697 INTON;
698}
699
700
701/*
702 * Called after a function returns.
703 */
704
705void
706poplocalvars(void)
707{
708 struct localvar *lvp;
709 struct var *vp;
710
711 while ((lvp = localvars) != NULL) {
712 localvars = lvp->next;
713 vp = lvp->vp;
714 if (vp == NULL) { /* $- saved */
715 memcpy(optlist, lvp->text, sizeof optlist);
716 ckfree(lvp->text);
717 } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
57fed2af 718 unsetvar(vp->text);
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719 } else {
720 if ((vp->flags & VTEXTFIXED) == 0)
721 ckfree(vp->text);
722 vp->flags = lvp->flags;
723 vp->text = lvp->text;
724 }
725 ckfree(lvp);
726 }
727}
728
729
730int
731setvarcmd(int argc, char **argv)
732{
733 if (argc <= 2)
734 return unsetcmd(argc, argv);
735 else if (argc == 3)
736 setvar(argv[1], argv[2], 0);
737 else
738 error("List assignment not implemented");
739 return 0;
740}
741
742
743/*
744 * The unset builtin command. We unset the function before we unset the
745 * variable to allow a function to be unset when there is a readonly variable
746 * with the same name.
747 */
748
749int
750unsetcmd(int argc __unused, char **argv __unused)
751{
752 char **ap;
753 int i;
754 int flg_func = 0;
755 int flg_var = 0;
756 int ret = 0;
757
758 while ((i = nextopt("vf")) != '\0') {
759 if (i == 'f')
760 flg_func = 1;
761 else
762 flg_var = 1;
763 }
764 if (flg_func == 0 && flg_var == 0)
765 flg_var = 1;
766
767 for (ap = argptr; *ap ; ap++) {
768 if (flg_func)
769 ret |= unsetfunc(*ap);
770 if (flg_var)
771 ret |= unsetvar(*ap);
772 }
773 return ret;
774}
775
776
777/*
778 * Unset the specified variable.
779 */
780
781int
492efe05 782unsetvar(const char *s)
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783{
784 struct var **vpp;
785 struct var *vp;
786
787 vpp = hashvar(s);
788 for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) {
789 if (varequal(vp->text, s)) {
790 if (vp->flags & VREADONLY)
791 return (1);
792 INTOFF;
793 if (*(strchr(vp->text, '=') + 1) != '\0')
794 setvar(s, nullstr, 0);
795 if ((vp->flags & VEXPORT) && localevar(vp->text)) {
796 unsetenv(s);
797 setlocale(LC_ALL, "");
798 }
799 vp->flags &= ~VEXPORT;
800 vp->flags |= VUNSET;
801 if ((vp->flags & VSTRFIXED) == 0) {
802 if ((vp->flags & VTEXTFIXED) == 0)
803 ckfree(vp->text);
804 *vpp = vp->next;
805 ckfree(vp);
806 }
807 INTON;
808 return (0);
809 }
810 }
31b6347c 811 return (0);
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812}
813
814
815
816/*
817 * Find the appropriate entry in the hash table from the name.
818 */
819
820STATIC struct var **
492efe05 821hashvar(const char *p)
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822{
823 unsigned int hashval;
824
825 hashval = ((unsigned char) *p) << 4;
826 while (*p && *p != '=')
827 hashval += (unsigned char) *p++;
828 return &vartab[hashval % VTABSIZE];
829}
830
831
832
833/*
834 * Returns true if the two strings specify the same varable. The first
835 * variable name is terminated by '='; the second may be terminated by
836 * either '=' or '\0'.
837 */
838
839STATIC int
492efe05 840varequal(const char *p, const char *q)
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841{
842 while (*p == *q++) {
843 if (*p++ == '=')
844 return 1;
845 }
846 if (*p == '=' && *(q - 1) == '\0')
847 return 1;
848 return 0;
849}