xref: /dragonfly/bin/sh/var.c (revision 934863d7) 
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.
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 $
38  * $DragonFly: src/bin/sh/var.c,v 1.12 2006/09/28 22:29:44 pavalos Exp $
39  */
40 
41 #include <unistd.h>
42 #include <stdlib.h>
43 
44 /*
45  * Shell variables.
46  */
47 
48 #include <locale.h>
49 
50 #include "shell.h"
51 #include "output.h"
52 #include "expand.h"
53 #include "nodes.h"	/* for other headers */
54 #include "eval.h"	/* defines cmdenviron */
55 #include "exec.h"
56 #include "syntax.h"
57 #include "options.h"
58 #include "mail.h"
59 #include "var.h"
60 #include "memalloc.h"
61 #include "error.h"
62 #include "mystring.h"
63 #include "parser.h"
64 #ifndef NO_HISTORY
65 #include "myhistedit.h"
66 #endif
67 
68 
69 #define VTABSIZE 39
70 
71 
72 struct varinit {
73 	struct var *var;
74 	int flags;
75 	const char *text;
76 	void (*func)(const char *);
77 };
78 
79 
80 #ifndef NO_HISTORY
81 struct var vhistsize;
82 #endif
83 struct var vifs;
84 struct var vmail;
85 struct var vmpath;
86 struct var vpath;
87 struct var vppid;
88 struct var vps1;
89 struct var vps2;
90 struct var vvers;
91 STATIC struct var voptind;
92 
93 STATIC const struct varinit varinit[] = {
94 #ifndef NO_HISTORY
95 	{ &vhistsize,	VSTRFIXED|VTEXTFIXED|VUNSET,	"HISTSIZE=",
96 	  sethistsize },
97 #endif
98 	{ &vifs,	VSTRFIXED|VTEXTFIXED,		"IFS= \t\n",
99 	  NULL },
100 	{ &vmail,	VSTRFIXED|VTEXTFIXED|VUNSET,	"MAIL=",
101 	  NULL },
102 	{ &vmpath,	VSTRFIXED|VTEXTFIXED|VUNSET,	"MAILPATH=",
103 	  NULL },
104 	{ &vpath,	VSTRFIXED|VTEXTFIXED,		"PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/pkg/bin:/usr/pkg/sbin",
105 	  changepath },
106 	{ &vppid,	VSTRFIXED|VTEXTFIXED|VUNSET,	"PPID=",
107 	  NULL },
108 	/*
109 	 * vps1 depends on uid
110 	 */
111 	{ &vps2,	VSTRFIXED|VTEXTFIXED,		"PS2=> ",
112 	  NULL },
113 	{ &voptind,	VSTRFIXED|VTEXTFIXED,		"OPTIND=1",
114 	  getoptsreset },
115 	{ NULL,	0,				NULL,
116 	  NULL }
117 };
118 
119 STATIC struct var *vartab[VTABSIZE];
120 
121 STATIC struct var **hashvar(const char *);
122 STATIC int varequal(const char *, const char *);
123 STATIC int localevar(const char *);
124 
125 /*
126  * Initialize the variable symbol tables and import the environment.
127  */
128 
129 #ifdef mkinit
130 INCLUDE "var.h"
131 MKINIT char **environ;
132 INIT {
133 	char **envp;
134 
135 	initvar();
136 	for (envp = environ ; *envp ; envp++) {
137 		if (strchr(*envp, '=')) {
138 			setvareq(*envp, VEXPORT|VTEXTFIXED);
139 		}
140 	}
141 }
142 #endif
143 
144 
145 /*
146  * This routine initializes the builtin variables.  It is called when the
147  * shell is initialized and again when a shell procedure is spawned.
148  */
149 
150 void
151 initvar(void)
152 {
153 	char ppid[20];
154 	const struct varinit *ip;
155 	struct var *vp;
156 	struct var **vpp;
157 
158 	for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
159 		if ((vp->flags & VEXPORT) == 0) {
160 			vpp = hashvar(ip->text);
161 			vp->next = *vpp;
162 			*vpp = vp;
163 			vp->text = strdup(ip->text);
164 			vp->flags = ip->flags;
165 			vp->func = ip->func;
166 		}
167 	}
168 	/*
169 	 * PS1 depends on uid
170 	 */
171 	if ((vps1.flags & VEXPORT) == 0) {
172 		vpp = hashvar("PS1=");
173 		vps1.next = *vpp;
174 		*vpp = &vps1;
175 		vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
176 		vps1.flags = VSTRFIXED|VTEXTFIXED;
177 	}
178 	if ((vppid.flags & VEXPORT) == 0) {
179 		fmtstr(ppid, sizeof(ppid), "%d", (int)getppid());
180 		setvarsafe("PPID", ppid, 0);
181 	}
182 }
183 
184 /*
185  * Safe version of setvar, returns 1 on success 0 on failure.
186  */
187 
188 int
189 setvarsafe(const char *name, const char *val, int flags)
190 {
191 	struct jmploc jmploc;
192 	struct jmploc *volatile savehandler = handler;
193 	int err = 0;
194 #if __GNUC__
195 	/* Avoid longjmp clobbering */
196 	(void) &err;
197 #endif
198 
199 	if (setjmp(jmploc.loc))
200 		err = 1;
201 	else {
202 		handler = &jmploc;
203 		setvar(name, val, flags);
204 	}
205 	handler = savehandler;
206 	return err;
207 }
208 
209 /*
210  * Set the value of a variable.  The flags argument is tored with the
211  * flags of the variable.  If val is NULL, the variable is unset.
212  */
213 
214 void
215 setvar(const char *name, const char *val, int flags)
216 {
217 	const char *cp;
218 	char *p;
219 	int len;
220 	int namelen;
221 	char *nameeq;
222 	int isbad;
223 
224 	isbad = 0;
225 	cp = name;
226 	if (!is_name(*cp))
227 		isbad = 1;
228 	cp++;
229 	for (;;) {
230 		if (!is_in_name(*cp)) {
231 			if (*cp == '\0' || *cp == '=')
232 				break;
233 			isbad = 1;
234 		}
235 		cp++;
236 	}
237 	namelen = cp - name;
238 	if (isbad)
239 		error("%.*s: bad variable name", namelen, name);
240 	len = namelen + 2;		/* 2 is space for '=' and '\0' */
241 	if (val == NULL) {
242 		flags |= VUNSET;
243 	} else {
244 		len += strlen(val);
245 	}
246 	p = nameeq = ckmalloc(len);
247 	cp = name;
248 	while (--namelen >= 0)
249 		*p++ = *cp++;
250 	*p++ = '=';
251 	*p = '\0';
252 	if (val)
253 		scopy(val, p);
254 	setvareq(nameeq, flags);
255 }
256 
257 STATIC int
258 localevar(const char *s)
259 {
260 	static const char * const lnames[7] = {
261 		"ALL", "COLLATE", "CTYPE", "MONETARY",
262 		"NUMERIC", "TIME", NULL
263 	};
264 	const char * const *ss;
265 
266 	if (*s != 'L')
267 		return 0;
268 	if (varequal(s + 1, "ANG"))
269 		return 1;
270 	if (strncmp(s + 1, "C_", 2) != 0)
271 		return 0;
272 	for (ss = lnames; *ss ; ss++)
273 		if (varequal(s + 3, *ss))
274 			return 1;
275 	return 0;
276 }
277 
278 /*
279  * Same as setvar except that the variable and value are passed in
280  * the first argument as name=value.  Since the first argument will
281  * be actually stored in the table, it should not be a string that
282  * will go away.
283  */
284 
285 void
286 setvareq(char *s, int flags)
287 {
288 	struct var *vp, **vpp;
289 	int len;
290 
291 	if (aflag)
292 		flags |= VEXPORT;
293 	vpp = hashvar(s);
294 	for (vp = *vpp ; vp ; vp = vp->next) {
295 		if (varequal(s, vp->text)) {
296 			if (vp->flags & VREADONLY) {
297 				len = strchr(s, '=') - s;
298 				error("%.*s: is read only", len, s);
299 			}
300 			INTOFF;
301 
302 			if (vp->func && (flags & VNOFUNC) == 0)
303 				(*vp->func)(strchr(s, '=') + 1);
304 
305 			if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
306 				ckfree(vp->text);
307 
308 			vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
309 			vp->flags |= flags;
310 			vp->text = s;
311 
312 			/*
313 			 * We could roll this to a function, to handle it as
314 			 * a regular variable function callback, but why bother?
315 			 */
316 			if (vp == &vmpath || (vp == &vmail && ! mpathset()))
317 				chkmail(1);
318 			if ((vp->flags & VEXPORT) && localevar(s)) {
319 				if (putenv(s) != 0)
320 					error("putenv: cannot set %s", s);
321 				setlocale(LC_ALL, "");
322 			}
323 			INTON;
324 			return;
325 		}
326 	}
327 	/* not found */
328 	vp = ckmalloc(sizeof (*vp));
329 	vp->flags = flags;
330 	vp->text = s;
331 	vp->next = *vpp;
332 	vp->func = NULL;
333 	INTOFF;
334 	*vpp = vp;
335 	if ((vp->flags & VEXPORT) && localevar(s)) {
336 		if (putenv(s) != 0)
337 			error("putenv: cannot set %s", s);
338 		setlocale(LC_ALL, "");
339 	}
340 	INTON;
341 }
342 
343 
344 
345 /*
346  * Process a linked list of variable assignments.
347  */
348 
349 void
350 listsetvar(struct strlist *list)
351 {
352 	struct strlist *lp;
353 
354 	INTOFF;
355 	for (lp = list ; lp ; lp = lp->next) {
356 		setvareq(savestr(lp->text), 0);
357 	}
358 	INTON;
359 }
360 
361 
362 
363 /*
364  * Find the value of a variable.  Returns NULL if not set.
365  */
366 
367 char *
368 lookupvar(const char *name)
369 {
370 	struct var *v;
371 
372 	for (v = *hashvar(name) ; v ; v = v->next) {
373 		if (varequal(v->text, name)) {
374 			if (v->flags & VUNSET)
375 				return NULL;
376 			return strchr(v->text, '=') + 1;
377 		}
378 	}
379 	return NULL;
380 }
381 
382 
383 
384 /*
385  * Search the environment of a builtin command.  If the second argument
386  * is nonzero, return the value of a variable even if it hasn't been
387  * exported.
388  */
389 
390 char *
391 bltinlookup(const char *name, int doall)
392 {
393 	struct strlist *sp;
394 	struct var *v;
395 
396 	for (sp = cmdenviron ; sp ; sp = sp->next) {
397 		if (varequal(sp->text, name))
398 			return strchr(sp->text, '=') + 1;
399 	}
400 	for (v = *hashvar(name) ; v ; v = v->next) {
401 		if (varequal(v->text, name)) {
402 			if ((v->flags & VUNSET)
403 			 || (!doall && (v->flags & VEXPORT) == 0))
404 				return NULL;
405 			return strchr(v->text, '=') + 1;
406 		}
407 	}
408 	return NULL;
409 }
410 
411 
412 
413 /*
414  * Generate a list of exported variables.  This routine is used to construct
415  * the third argument to execve when executing a program.
416  */
417 
418 char **
419 environment(void)
420 {
421 	int nenv;
422 	struct var **vpp;
423 	struct var *vp;
424 	char **env, **ep;
425 
426 	nenv = 0;
427 	for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
428 		for (vp = *vpp ; vp ; vp = vp->next)
429 			if (vp->flags & VEXPORT)
430 				nenv++;
431 	}
432 	ep = env = stalloc((nenv + 1) * sizeof *env);
433 	for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
434 		for (vp = *vpp ; vp ; vp = vp->next)
435 			if (vp->flags & VEXPORT)
436 				*ep++ = vp->text;
437 	}
438 	*ep = NULL;
439 	return env;
440 }
441 
442 
443 /*
444  * Called when a shell procedure is invoked to clear out nonexported
445  * variables.  It is also necessary to reallocate variables of with
446  * VSTACK set since these are currently allocated on the stack.
447  */
448 
449 #ifdef mkinit
450 void shprocvar(void);
451 
452 SHELLPROC {
453 	shprocvar();
454 }
455 #endif
456 
457 void
458 shprocvar(void)
459 {
460 	struct var **vpp;
461 	struct var *vp, **prev;
462 
463 	for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
464 		for (prev = vpp ; (vp = *prev) != NULL ; ) {
465 			if ((vp->flags & VEXPORT) == 0) {
466 				*prev = vp->next;
467 				if ((vp->flags & VTEXTFIXED) == 0)
468 					ckfree(vp->text);
469 				if ((vp->flags & VSTRFIXED) == 0)
470 					ckfree(vp);
471 			} else {
472 				if (vp->flags & VSTACK) {
473 					vp->text = savestr(vp->text);
474 					vp->flags &=~ VSTACK;
475 				}
476 				prev = &vp->next;
477 			}
478 		}
479 	}
480 	initvar();
481 }
482 
483 
484 
485 /*
486  * Command to list all variables which are set.  Currently this command
487  * is invoked from the set command when the set command is called without
488  * any variables.
489  */
490 
491 int
492 showvarscmd(int argc __unused, char **argv __unused)
493 {
494 	struct var **vpp;
495 	struct var *vp;
496 	const char *s;
497 
498 	for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
499 		for (vp = *vpp ; vp ; vp = vp->next) {
500 			if (vp->flags & VUNSET)
501 				continue;
502 			for (s = vp->text; *s != '='; s++)
503 				out1c(*s);
504 			out1c('=');
505 			out1qstr(s + 1);
506 			out1c('\n');
507 		}
508 	}
509 	return 0;
510 }
511 
512 
513 
514 /*
515  * The export and readonly commands.
516  */
517 
518 int
519 exportcmd(int argc, char **argv)
520 {
521 	struct var **vpp;
522 	struct var *vp;
523 	char *name;
524 	char *p;
525 	char *cmdname;
526 	int ch, values;
527 	int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
528 
529 	cmdname = argv[0];
530 	optreset = optind = 1;
531 	opterr = 0;
532 	values = 0;
533 	while ((ch = getopt(argc, argv, "p")) != -1) {
534 		switch (ch) {
535 		case 'p':
536 			values = 1;
537 			break;
538 		case '?':
539 		default:
540 			error("unknown option: -%c", optopt);
541 		}
542 	}
543 	argc -= optind;
544 	argv += optind;
545 
546 	listsetvar(cmdenviron);
547 	if (argc != 0) {
548 		while ((name = *argptr++) != NULL) {
549 			if ((p = strchr(name, '=')) != NULL) {
550 				p++;
551 			} else {
552 				vpp = hashvar(name);
553 				for (vp = *vpp ; vp ; vp = vp->next) {
554 					if (varequal(vp->text, name)) {
555 
556 						vp->flags |= flag;
557 						if ((vp->flags & VEXPORT) && localevar(vp->text)) {
558 							if (putenv(vp->text) != 0)
559 								error("putenv: cannot set %s", vp->text);
560 							setlocale(LC_ALL, "");
561 						}
562 						goto found;
563 					}
564 				}
565 			}
566 			setvar(name, p, flag);
567 found:;
568 		}
569 	} else {
570 		for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
571 			for (vp = *vpp ; vp ; vp = vp->next) {
572 				if (vp->flags & flag) {
573 					if (values) {
574 						out1str(cmdname);
575 						out1c(' ');
576 					}
577 					for (p = vp->text ; *p != '=' ; p++)
578 						out1c(*p);
579 					if (values && !(vp->flags & VUNSET)) {
580 						out1c('=');
581 						out1qstr(p + 1);
582 					}
583 					out1c('\n');
584 				}
585 			}
586 		}
587 	}
588 	return 0;
589 }
590 
591 
592 /*
593  * The "local" command.
594  */
595 
596 int
597 localcmd(int argc __unused, char **argv __unused)
598 {
599 	char *name;
600 
601 	if (! in_function())
602 		error("Not in a function");
603 	while ((name = *argptr++) != NULL) {
604 		mklocal(name);
605 	}
606 	return 0;
607 }
608 
609 
610 /*
611  * Make a variable a local variable.  When a variable is made local, it's
612  * value and flags are saved in a localvar structure.  The saved values
613  * will be restored when the shell function returns.  We handle the name
614  * "-" as a special case.
615  */
616 
617 void
618 mklocal(char *name)
619 {
620 	struct localvar *lvp;
621 	struct var **vpp;
622 	struct var *vp;
623 
624 	INTOFF;
625 	lvp = ckmalloc(sizeof (struct localvar));
626 	if (name[0] == '-' && name[1] == '\0') {
627 		lvp->text = ckmalloc(sizeof optlist);
628 		memcpy(lvp->text, optlist, sizeof optlist);
629 		vp = NULL;
630 	} else {
631 		vpp = hashvar(name);
632 		for (vp = *vpp ; vp && ! varequal(vp->text, name) ; vp = vp->next);
633 		if (vp == NULL) {
634 			if (strchr(name, '='))
635 				setvareq(savestr(name), VSTRFIXED);
636 			else
637 				setvar(name, NULL, VSTRFIXED);
638 			vp = *vpp;	/* the new variable */
639 			lvp->text = NULL;
640 			lvp->flags = VUNSET;
641 		} else {
642 			lvp->text = vp->text;
643 			lvp->flags = vp->flags;
644 			vp->flags |= VSTRFIXED|VTEXTFIXED;
645 			if (strchr(name, '='))
646 				setvareq(savestr(name), 0);
647 		}
648 	}
649 	lvp->vp = vp;
650 	lvp->next = localvars;
651 	localvars = lvp;
652 	INTON;
653 }
654 
655 
656 /*
657  * Called after a function returns.
658  */
659 
660 void
661 poplocalvars(void)
662 {
663 	struct localvar *lvp;
664 	struct var *vp;
665 
666 	while ((lvp = localvars) != NULL) {
667 		localvars = lvp->next;
668 		vp = lvp->vp;
669 		if (vp == NULL) {	/* $- saved */
670 			memcpy(optlist, lvp->text, sizeof optlist);
671 			ckfree(lvp->text);
672 		} else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
673 			unsetvar(vp->text);
674 		} else {
675 			if ((vp->flags & VTEXTFIXED) == 0)
676 				ckfree(vp->text);
677 			vp->flags = lvp->flags;
678 			vp->text = lvp->text;
679 		}
680 		ckfree(lvp);
681 	}
682 }
683 
684 
685 int
686 setvarcmd(int argc, char **argv)
687 {
688 	if (argc <= 2)
689 		return unsetcmd(argc, argv);
690 	else if (argc == 3)
691 		setvar(argv[1], argv[2], 0);
692 	else
693 		error("List assignment not implemented");
694 	return 0;
695 }
696 
697 
698 /*
699  * The unset builtin command.  We unset the function before we unset the
700  * variable to allow a function to be unset when there is a readonly variable
701  * with the same name.
702  */
703 
704 int
705 unsetcmd(int argc __unused, char **argv __unused)
706 {
707 	char **ap;
708 	int i;
709 	int flg_func = 0;
710 	int flg_var = 0;
711 	int ret = 0;
712 
713 	while ((i = nextopt("vf")) != '\0') {
714 		if (i == 'f')
715 			flg_func = 1;
716 		else
717 			flg_var = 1;
718 	}
719 	if (flg_func == 0 && flg_var == 0)
720 		flg_var = 1;
721 
722 	for (ap = argptr; *ap ; ap++) {
723 		if (flg_func)
724 			ret |= unsetfunc(*ap);
725 		if (flg_var)
726 			ret |= unsetvar(*ap);
727 	}
728 	return ret;
729 }
730 
731 
732 /*
733  * Unset the specified variable.
734  */
735 
736 int
737 unsetvar(const char *s)
738 {
739 	struct var **vpp;
740 	struct var *vp;
741 
742 	vpp = hashvar(s);
743 	for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) {
744 		if (varequal(vp->text, s)) {
745 			if (vp->flags & VREADONLY)
746 				return (1);
747 			INTOFF;
748 			if (*(strchr(vp->text, '=') + 1) != '\0')
749 				setvar(s, nullstr, 0);
750 			if ((vp->flags & VEXPORT) && localevar(vp->text)) {
751 				unsetenv(s);
752 				setlocale(LC_ALL, "");
753 			}
754 			vp->flags &= ~VEXPORT;
755 			vp->flags |= VUNSET;
756 			if ((vp->flags & VSTRFIXED) == 0) {
757 				if ((vp->flags & VTEXTFIXED) == 0)
758 					ckfree(vp->text);
759 				*vpp = vp->next;
760 				ckfree(vp);
761 			}
762 			INTON;
763 			return (0);
764 		}
765 	}
766 	return (0);
767 }
768 
769 
770 
771 /*
772  * Find the appropriate entry in the hash table from the name.
773  */
774 
775 STATIC struct var **
776 hashvar(const char *p)
777 {
778 	unsigned int hashval;
779 
780 	hashval = ((unsigned char) *p) << 4;
781 	while (*p && *p != '=')
782 		hashval += (unsigned char) *p++;
783 	return &vartab[hashval % VTABSIZE];
784 }
785 
786 
787 
788 /*
789  * Returns true if the two strings specify the same varable.  The first
790  * variable name is terminated by '='; the second may be terminated by
791  * either '=' or '\0'.
792  */
793 
794 STATIC int
795 varequal(const char *p, const char *q)
796 {
797 	while (*p == *q++) {
798 		if (*p++ == '=')
799 			return 1;
800 	}
801 	if (*p == '=' && *(q - 1) == '\0')
802 		return 1;
803 	return 0;
804 }
805