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var.c revision 1.26 
      1 /*	$NetBSD: var.c,v 1.26 2000/12/20 00:15:10 cgd 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. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 #ifndef lint
     41 #if 0
     42 static char sccsid[] = "@(#)var.c	8.3 (Berkeley) 5/4/95";
     43 #else
     44 __RCSID("$NetBSD: var.c,v 1.26 2000/12/20 00:15:10 cgd Exp $");
     45 #endif
     46 #endif /* not lint */
     47 
     48 #include <unistd.h>
     49 #include <stdlib.h>
     50 #include <paths.h>
     51 
     52 /*
     53  * Shell variables.
     54  */
     55 
     56 #include "shell.h"
     57 #include "output.h"
     58 #include "expand.h"
     59 #include "nodes.h"	/* for other headers */
     60 #include "eval.h"	/* defines cmdenviron */
     61 #include "exec.h"
     62 #include "syntax.h"
     63 #include "options.h"
     64 #include "mail.h"
     65 #include "var.h"
     66 #include "memalloc.h"
     67 #include "error.h"
     68 #include "mystring.h"
     69 #include "parser.h"
     70 #ifndef SMALL
     71 #include "myhistedit.h"
     72 #endif
     73 
     74 
     75 #define VTABSIZE 39
     76 
     77 
     78 struct varinit {
     79 	struct var *var;
     80 	int flags;
     81 	const char *text;
     82 	void (*func) __P((const char *));
     83 };
     84 
     85 
     86 #if ATTY
     87 struct var vatty;
     88 #endif
     89 #ifndef SMALL
     90 struct var vhistsize;
     91 struct var vterm;
     92 #endif
     93 struct var vifs;
     94 struct var vmail;
     95 struct var vmpath;
     96 struct var vpath;
     97 struct var vps1;
     98 struct var vps2;
     99 struct var vvers;
    100 struct var voptind;
    101 
    102 const struct varinit varinit[] = {
    103 #if ATTY
    104 	{ &vatty,	VSTRFIXED|VTEXTFIXED|VUNSET,	"ATTY=",
    105 	  NULL },
    106 #endif
    107 #ifndef SMALL
    108 	{ &vhistsize,	VSTRFIXED|VTEXTFIXED|VUNSET,	"HISTSIZE=",
    109 	  sethistsize },
    110 #endif
    111 	{ &vifs,	VSTRFIXED|VTEXTFIXED,		"IFS= \t\n",
    112 	  NULL },
    113 	{ &vmail,	VSTRFIXED|VTEXTFIXED|VUNSET,	"MAIL=",
    114 	  NULL },
    115 	{ &vmpath,	VSTRFIXED|VTEXTFIXED|VUNSET,	"MAILPATH=",
    116 	  NULL },
    117 	{ &vpath,	VSTRFIXED|VTEXTFIXED,		"PATH=" _PATH_DEFPATH,
    118 	  changepath },
    119 	/*
    120 	 * vps1 depends on uid
    121 	 */
    122 	{ &vps2,	VSTRFIXED|VTEXTFIXED,		"PS2=> ",
    123 	  NULL },
    124 #ifndef SMALL
    125 	{ &vterm,	VSTRFIXED|VTEXTFIXED|VUNSET,	"TERM=",
    126 	  setterm },
    127 #endif
    128 	{ &voptind,	VSTRFIXED|VTEXTFIXED,		"OPTIND=1",
    129 	  getoptsreset },
    130 	{ NULL,	0,				NULL,
    131 	  NULL }
    132 };
    133 
    134 struct var *vartab[VTABSIZE];
    135 
    136 STATIC struct var **hashvar __P((const char *));
    137 STATIC int varequal __P((const char *, const char *));
    138 
    139 /*
    140  * Initialize the varable symbol tables and import the environment
    141  */
    142 
    143 #ifdef mkinit
    144 INCLUDE "var.h"
    145 INIT {
    146 	char **envp;
    147 	extern char **environ;
    148 
    149 	initvar();
    150 	for (envp = environ ; *envp ; envp++) {
    151 		if (strchr(*envp, '=')) {
    152 			setvareq(*envp, VEXPORT|VTEXTFIXED);
    153 		}
    154 	}
    155 }
    156 #endif
    157 
    158 
    159 /*
    160  * This routine initializes the builtin variables.  It is called when the
    161  * shell is initialized and again when a shell procedure is spawned.
    162  */
    163 
    164 void
    165 initvar() {
    166 	const struct varinit *ip;
    167 	struct var *vp;
    168 	struct var **vpp;
    169 
    170 	for (ip = varinit ; (vp = ip->var) != NULL ; ip++) {
    171 		if ((vp->flags & VEXPORT) == 0) {
    172 			vpp = hashvar(ip->text);
    173 			vp->next = *vpp;
    174 			*vpp = vp;
    175 			vp->text = strdup(ip->text);
    176 			vp->flags = ip->flags;
    177 			vp->func = ip->func;
    178 		}
    179 	}
    180 	/*
    181 	 * PS1 depends on uid
    182 	 */
    183 	if ((vps1.flags & VEXPORT) == 0) {
    184 		vpp = hashvar("PS1=");
    185 		vps1.next = *vpp;
    186 		*vpp = &vps1;
    187 		vps1.text = strdup(geteuid() ? "PS1=$ " : "PS1=# ");
    188 		vps1.flags = VSTRFIXED|VTEXTFIXED;
    189 	}
    190 }
    191 
    192 /*
    193  * Safe version of setvar, returns 1 on success 0 on failure.
    194  */
    195 
    196 int
    197 setvarsafe(name, val, flags)
    198 	const char *name, *val;
    199 	int flags;
    200 {
    201 	struct jmploc jmploc;
    202 	struct jmploc *volatile savehandler = handler;
    203 	int err = 0;
    204 #ifdef __GNUC__
    205 	(void) &err;
    206 #endif
    207 
    208 	if (setjmp(jmploc.loc))
    209 		err = 1;
    210 	else {
    211 		handler = &jmploc;
    212 		setvar(name, val, flags);
    213 	}
    214 	handler = savehandler;
    215 	return err;
    216 }
    217 
    218 /*
    219  * Set the value of a variable.  The flags argument is ored with the
    220  * flags of the variable.  If val is NULL, the variable is unset.
    221  */
    222 
    223 void
    224 setvar(name, val, flags)
    225 	const char *name, *val;
    226 	int flags;
    227 {
    228 	const char *p;
    229 	const char *q;
    230 	char *d;
    231 	int len;
    232 	int namelen;
    233 	char *nameeq;
    234 	int isbad;
    235 
    236 	isbad = 0;
    237 	p = name;
    238 	if (! is_name(*p))
    239 		isbad = 1;
    240 	p++;
    241 	for (;;) {
    242 		if (! is_in_name(*p)) {
    243 			if (*p == '\0' || *p == '=')
    244 				break;
    245 			isbad = 1;
    246 		}
    247 		p++;
    248 	}
    249 	namelen = p - name;
    250 	if (isbad)
    251 		error("%.*s: bad variable name", namelen, name);
    252 	len = namelen + 2;		/* 2 is space for '=' and '\0' */
    253 	if (val == NULL) {
    254 		flags |= VUNSET;
    255 	} else {
    256 		len += strlen(val);
    257 	}
    258 	d = nameeq = ckmalloc(len);
    259 	q = name;
    260 	while (--namelen >= 0)
    261 		*d++ = *q++;
    262 	*d++ = '=';
    263 	*d = '\0';
    264 	if (val)
    265 		scopy(val, d);
    266 	setvareq(nameeq, flags);
    267 }
    268 
    269 
    270 
    271 /*
    272  * Same as setvar except that the variable and value are passed in
    273  * the first argument as name=value.  Since the first argument will
    274  * be actually stored in the table, it should not be a string that
    275  * will go away.
    276  */
    277 
    278 void
    279 setvareq(s, flags)
    280 	char *s;
    281 	int flags;
    282 {
    283 	struct var *vp, **vpp;
    284 
    285 	vpp = hashvar(s);
    286 	for (vp = *vpp ; vp ; vp = vp->next) {
    287 		if (varequal(s, vp->text)) {
    288 			if (vp->flags & VREADONLY) {
    289 				size_t len = strchr(s, '=') - s;
    290 				error("%.*s: is read only", len, s);
    291 			}
    292 			INTOFF;
    293 
    294 			if (vp->func && (flags & VNOFUNC) == 0)
    295 				(*vp->func)(strchr(s, '=') + 1);
    296 
    297 			if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0)
    298 				ckfree(vp->text);
    299 
    300 			vp->flags &= ~(VTEXTFIXED|VSTACK|VUNSET);
    301 			vp->flags |= flags;
    302 			vp->text = s;
    303 
    304 			/*
    305 			 * We could roll this to a function, to handle it as
    306 			 * a regular variable function callback, but why bother?
    307 			 */
    308 			if (vp == &vmpath || (vp == &vmail && ! mpathset()))
    309 				chkmail(1);
    310 			INTON;
    311 			return;
    312 		}
    313 	}
    314 	/* not found */
    315 	vp = ckmalloc(sizeof (*vp));
    316 	vp->flags = flags;
    317 	vp->text = s;
    318 	vp->next = *vpp;
    319 	vp->func = NULL;
    320 	*vpp = vp;
    321 }
    322 
    323 
    324 
    325 /*
    326  * Process a linked list of variable assignments.
    327  */
    328 
    329 void
    330 listsetvar(list)
    331 	struct strlist *list;
    332 	{
    333 	struct strlist *lp;
    334 
    335 	INTOFF;
    336 	for (lp = list ; lp ; lp = lp->next) {
    337 		setvareq(savestr(lp->text), 0);
    338 	}
    339 	INTON;
    340 }
    341 
    342 
    343 
    344 /*
    345  * Find the value of a variable.  Returns NULL if not set.
    346  */
    347 
    348 char *
    349 lookupvar(name)
    350 	const char *name;
    351 	{
    352 	struct var *v;
    353 
    354 	for (v = *hashvar(name) ; v ; v = v->next) {
    355 		if (varequal(v->text, name)) {
    356 			if (v->flags & VUNSET)
    357 				return NULL;
    358 			return strchr(v->text, '=') + 1;
    359 		}
    360 	}
    361 	return NULL;
    362 }
    363 
    364 
    365 
    366 /*
    367  * Search the environment of a builtin command.  If the second argument
    368  * is nonzero, return the value of a variable even if it hasn't been
    369  * exported.
    370  */
    371 
    372 char *
    373 bltinlookup(name, doall)
    374 	const char *name;
    375 	int doall;
    376 {
    377 	struct strlist *sp;
    378 	struct var *v;
    379 
    380 	for (sp = cmdenviron ; sp ; sp = sp->next) {
    381 		if (varequal(sp->text, name))
    382 			return strchr(sp->text, '=') + 1;
    383 	}
    384 	for (v = *hashvar(name) ; v ; v = v->next) {
    385 		if (varequal(v->text, name)) {
    386 			if ((v->flags & VUNSET)
    387 			 || (!doall && (v->flags & VEXPORT) == 0))
    388 				return NULL;
    389 			return strchr(v->text, '=') + 1;
    390 		}
    391 	}
    392 	return NULL;
    393 }
    394 
    395 
    396 
    397 /*
    398  * Generate a list of exported variables.  This routine is used to construct
    399  * the third argument to execve when executing a program.
    400  */
    401 
    402 char **
    403 environment() {
    404 	int nenv;
    405 	struct var **vpp;
    406 	struct var *vp;
    407 	char **env;
    408 	char **ep;
    409 
    410 	nenv = 0;
    411 	for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
    412 		for (vp = *vpp ; vp ; vp = vp->next)
    413 			if (vp->flags & VEXPORT)
    414 				nenv++;
    415 	}
    416 	ep = env = stalloc((nenv + 1) * sizeof *env);
    417 	for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
    418 		for (vp = *vpp ; vp ; vp = vp->next)
    419 			if (vp->flags & VEXPORT)
    420 				*ep++ = vp->text;
    421 	}
    422 	*ep = NULL;
    423 	return env;
    424 }
    425 
    426 
    427 /*
    428  * Called when a shell procedure is invoked to clear out nonexported
    429  * variables.  It is also necessary to reallocate variables of with
    430  * VSTACK set since these are currently allocated on the stack.
    431  */
    432 
    433 #ifdef mkinit
    434 MKINIT void shprocvar __P((void));
    435 
    436 SHELLPROC {
    437 	shprocvar();
    438 }
    439 #endif
    440 
    441 void
    442 shprocvar() {
    443 	struct var **vpp;
    444 	struct var *vp, **prev;
    445 
    446 	for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
    447 		for (prev = vpp ; (vp = *prev) != NULL ; ) {
    448 			if ((vp->flags & VEXPORT) == 0) {
    449 				*prev = vp->next;
    450 				if ((vp->flags & VTEXTFIXED) == 0)
    451 					ckfree(vp->text);
    452 				if ((vp->flags & VSTRFIXED) == 0)
    453 					ckfree(vp);
    454 			} else {
    455 				if (vp->flags & VSTACK) {
    456 					vp->text = savestr(vp->text);
    457 					vp->flags &=~ VSTACK;
    458 				}
    459 				prev = &vp->next;
    460 			}
    461 		}
    462 	}
    463 	initvar();
    464 }
    465 
    466 
    467 
    468 /*
    469  * Command to list all variables which are set.  Currently this command
    470  * is invoked from the set command when the set command is called without
    471  * any variables.
    472  */
    473 
    474 int
    475 showvarscmd(argc, argv)
    476 	int argc;
    477 	char **argv;
    478 {
    479 	struct var **vpp;
    480 	struct var *vp;
    481 
    482 	for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
    483 		for (vp = *vpp ; vp ; vp = vp->next) {
    484 			if ((vp->flags & VUNSET) == 0)
    485 				out1fmt("%s\n", vp->text);
    486 		}
    487 	}
    488 	return 0;
    489 }
    490 
    491 
    492 
    493 /*
    494  * The export and readonly commands.
    495  */
    496 
    497 int
    498 exportcmd(argc, argv)
    499 	int argc;
    500 	char **argv;
    501 {
    502 	struct var **vpp;
    503 	struct var *vp;
    504 	char *name;
    505 	const char *p;
    506 	int flag = argv[0][0] == 'r'? VREADONLY : VEXPORT;
    507 	int pflag;
    508 
    509 	listsetvar(cmdenviron);
    510 	pflag = (nextopt("p") == 'p');
    511 	if (argc > 1 && !pflag) {
    512 		while ((name = *argptr++) != NULL) {
    513 			if ((p = strchr(name, '=')) != NULL) {
    514 				p++;
    515 			} else {
    516 				vpp = hashvar(name);
    517 				for (vp = *vpp ; vp ; vp = vp->next) {
    518 					if (varequal(vp->text, name)) {
    519 						vp->flags |= flag;
    520 						goto found;
    521 					}
    522 				}
    523 			}
    524 			setvar(name, p, flag);
    525 found:;
    526 		}
    527 	} else {
    528 		for (vpp = vartab ; vpp < vartab + VTABSIZE ; vpp++) {
    529 			for (vp = *vpp ; vp ; vp = vp->next) {
    530 				if ((vp->flags & flag) == 0)
    531 					continue;
    532 				if (pflag) {
    533 					out1fmt("%s %s\n", argv[0], vp->text);
    534 				} else {
    535 					for (p = vp->text ; *p != '=' ; p++)
    536 						out1c(*p);
    537 					out1c('\n');
    538 				}
    539 			}
    540 		}
    541 	}
    542 	return 0;
    543 }
    544 
    545 
    546 /*
    547  * The "local" command.
    548  */
    549 
    550 int
    551 localcmd(argc, argv)
    552 	int argc;
    553 	char **argv;
    554 {
    555 	char *name;
    556 
    557 	if (! in_function())
    558 		error("Not in a function");
    559 	while ((name = *argptr++) != NULL) {
    560 		mklocal(name);
    561 	}
    562 	return 0;
    563 }
    564 
    565 
    566 /*
    567  * Make a variable a local variable.  When a variable is made local, it's
    568  * value and flags are saved in a localvar structure.  The saved values
    569  * will be restored when the shell function returns.  We handle the name
    570  * "-" as a special case.
    571  */
    572 
    573 void
    574 mklocal(name)
    575 	char *name;
    576 	{
    577 	struct localvar *lvp;
    578 	struct var **vpp;
    579 	struct var *vp;
    580 
    581 	INTOFF;
    582 	lvp = ckmalloc(sizeof (struct localvar));
    583 	if (name[0] == '-' && name[1] == '\0') {
    584 		char *p;
    585 		p = ckmalloc(sizeof optlist);
    586 		lvp->text = memcpy(p, optlist, sizeof optlist);
    587 		vp = NULL;
    588 	} else {
    589 		vpp = hashvar(name);
    590 		for (vp = *vpp ; vp && ! varequal(vp->text, name) ; vp = vp->next);
    591 		if (vp == NULL) {
    592 			if (strchr(name, '='))
    593 				setvareq(savestr(name), VSTRFIXED);
    594 			else
    595 				setvar(name, NULL, VSTRFIXED);
    596 			vp = *vpp;	/* the new variable */
    597 			lvp->text = NULL;
    598 			lvp->flags = VUNSET;
    599 		} else {
    600 			lvp->text = vp->text;
    601 			lvp->flags = vp->flags;
    602 			vp->flags |= VSTRFIXED|VTEXTFIXED;
    603 			if (strchr(name, '='))
    604 				setvareq(savestr(name), 0);
    605 		}
    606 	}
    607 	lvp->vp = vp;
    608 	lvp->next = localvars;
    609 	localvars = lvp;
    610 	INTON;
    611 }
    612 
    613 
    614 /*
    615  * Called after a function returns.
    616  */
    617 
    618 void
    619 poplocalvars() {
    620 	struct localvar *lvp;
    621 	struct var *vp;
    622 
    623 	while ((lvp = localvars) != NULL) {
    624 		localvars = lvp->next;
    625 		vp = lvp->vp;
    626 		if (vp == NULL) {	/* $- saved */
    627 			memcpy(optlist, lvp->text, sizeof optlist);
    628 			ckfree(lvp->text);
    629 		} else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) {
    630 			(void)unsetvar(vp->text);
    631 		} else {
    632 			if ((vp->flags & VTEXTFIXED) == 0)
    633 				ckfree(vp->text);
    634 			vp->flags = lvp->flags;
    635 			vp->text = lvp->text;
    636 		}
    637 		ckfree(lvp);
    638 	}
    639 }
    640 
    641 
    642 int
    643 setvarcmd(argc, argv)
    644 	int argc;
    645 	char **argv;
    646 {
    647 	if (argc <= 2)
    648 		return unsetcmd(argc, argv);
    649 	else if (argc == 3)
    650 		setvar(argv[1], argv[2], 0);
    651 	else
    652 		error("List assignment not implemented");
    653 	return 0;
    654 }
    655 
    656 
    657 /*
    658  * The unset builtin command.  We unset the function before we unset the
    659  * variable to allow a function to be unset when there is a readonly variable
    660  * with the same name.
    661  */
    662 
    663 int
    664 unsetcmd(argc, argv)
    665 	int argc;
    666 	char **argv;
    667 {
    668 	char **ap;
    669 	int i;
    670 	int flg_func = 0;
    671 	int flg_var = 0;
    672 	int ret = 0;
    673 
    674 	while ((i = nextopt("vf")) != '\0') {
    675 		if (i == 'f')
    676 			flg_func = 1;
    677 		else
    678 			flg_var = 1;
    679 	}
    680 	if (flg_func == 0 && flg_var == 0)
    681 		flg_var = 1;
    682 
    683 	for (ap = argptr; *ap ; ap++) {
    684 		if (flg_func)
    685 			ret |= unsetfunc(*ap);
    686 		if (flg_var)
    687 			ret |= unsetvar(*ap);
    688 	}
    689 	return ret;
    690 }
    691 
    692 
    693 /*
    694  * Unset the specified variable.
    695  */
    696 
    697 int
    698 unsetvar(s)
    699 	const char *s;
    700 	{
    701 	struct var **vpp;
    702 	struct var *vp;
    703 
    704 	vpp = hashvar(s);
    705 	for (vp = *vpp ; vp ; vpp = &vp->next, vp = *vpp) {
    706 		if (varequal(vp->text, s)) {
    707 			if (vp->flags & VREADONLY)
    708 				return (1);
    709 			INTOFF;
    710 			if (*(strchr(vp->text, '=') + 1) != '\0')
    711 				setvar(s, nullstr, 0);
    712 			vp->flags &= ~VEXPORT;
    713 			vp->flags |= VUNSET;
    714 			if ((vp->flags & VSTRFIXED) == 0) {
    715 				if ((vp->flags & VTEXTFIXED) == 0)
    716 					ckfree(vp->text);
    717 				*vpp = vp->next;
    718 				ckfree(vp);
    719 			}
    720 			INTON;
    721 			return (0);
    722 		}
    723 	}
    724 
    725 	return (1);
    726 }
    727 
    728 
    729 
    730 /*
    731  * Find the appropriate entry in the hash table from the name.
    732  */
    733 
    734 STATIC struct var **
    735 hashvar(p)
    736 	const char *p;
    737 	{
    738 	unsigned int hashval;
    739 
    740 	hashval = ((unsigned char) *p) << 4;
    741 	while (*p && *p != '=')
    742 		hashval += (unsigned char) *p++;
    743 	return &vartab[hashval % VTABSIZE];
    744 }
    745 
    746 
    747 
    748 /*
    749  * Returns true if the two strings specify the same varable.  The first
    750  * variable name is terminated by '='; the second may be terminated by
    751  * either '=' or '\0'.
    752  */
    753 
    754 STATIC int
    755 varequal(p, q)
    756 	const char *p, *q;
    757 	{
    758 	while (*p == *q++) {
    759 		if (*p++ == '=')
    760 			return 1;
    761 	}
    762 	if (*p == '=' && *(q - 1) == '\0')
    763 		return 1;
    764 	return 0;
    765 }
    766