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options.c revision 1.32 
      1 /*	$NetBSD: options.c,v 1.32 2002/11/24 22:35:42 christos 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[] = "@(#)options.c	8.2 (Berkeley) 5/4/95";
     43 #else
     44 __RCSID("$NetBSD: options.c,v 1.32 2002/11/24 22:35:42 christos Exp $");
     45 #endif
     46 #endif /* not lint */
     47 
     48 #include <signal.h>
     49 #include <unistd.h>
     50 #include <stdlib.h>
     51 
     52 #include "shell.h"
     53 #define DEFINE_OPTIONS
     54 #include "options.h"
     55 #undef DEFINE_OPTIONS
     56 #include "nodes.h"	/* for other header files */
     57 #include "eval.h"
     58 #include "jobs.h"
     59 #include "input.h"
     60 #include "output.h"
     61 #include "trap.h"
     62 #include "var.h"
     63 #include "memalloc.h"
     64 #include "error.h"
     65 #include "mystring.h"
     66 #ifndef SMALL
     67 #include "myhistedit.h"
     68 #endif
     69 #include "show.h"
     70 
     71 char *arg0;			/* value of $0 */
     72 struct shparam shellparam;	/* current positional parameters */
     73 char **argptr;			/* argument list for builtin commands */
     74 char *optionarg;		/* set by nextopt (like getopt) */
     75 char *optptr;			/* used by nextopt */
     76 
     77 char *minusc;			/* argument to -c option */
     78 
     79 
     80 STATIC void options(int);
     81 STATIC void minus_o(char *, int);
     82 STATIC void setoption(int, int);
     83 STATIC int getopts(char *, char *, char **, char ***, char **);
     84 
     85 
     86 /*
     87  * Process the shell command line arguments.
     88  */
     89 
     90 void
     91 procargs(int argc, char **argv)
     92 {
     93 	int i;
     94 
     95 	argptr = argv;
     96 	if (argc > 0)
     97 		argptr++;
     98 	for (i = 0; i < NOPTS; i++)
     99 		optlist[i].val = 2;
    100 	options(1);
    101 	if (*argptr == NULL && minusc == NULL)
    102 		sflag = 1;
    103 	if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
    104 		iflag = 1;
    105 	if (mflag == 2)
    106 		mflag = iflag;
    107 	for (i = 0; i < NOPTS; i++)
    108 		if (optlist[i].val == 2)
    109 			optlist[i].val = 0;
    110 #if DEBUG == 2
    111 	debug = 1;
    112 #endif
    113 	arg0 = argv[0];
    114 	if (sflag == 0 && minusc == NULL) {
    115 		commandname = argv[0];
    116 		arg0 = *argptr++;
    117 		setinputfile(arg0, 0);
    118 		commandname = arg0;
    119 	}
    120 	/* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
    121 	if (argptr && minusc && *argptr)
    122 	        arg0 = *argptr++;
    123 
    124 	shellparam.p = argptr;
    125 	shellparam.reset = 1;
    126 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    127 	while (*argptr) {
    128 		shellparam.nparam++;
    129 		argptr++;
    130 	}
    131 	optschanged();
    132 }
    133 
    134 
    135 void
    136 optschanged(void)
    137 {
    138 	setinteractive(iflag);
    139 #ifndef SMALL
    140 	histedit();
    141 #endif
    142 	setjobctl(mflag);
    143 }
    144 
    145 /*
    146  * Process shell options.  The global variable argptr contains a pointer
    147  * to the argument list; we advance it past the options.
    148  */
    149 
    150 STATIC void
    151 options(int cmdline)
    152 {
    153 	char *p;
    154 	int val;
    155 	int c;
    156 
    157 	if (cmdline)
    158 		minusc = NULL;
    159 	while ((p = *argptr) != NULL) {
    160 		argptr++;
    161 		if ((c = *p++) == '-') {
    162 			val = 1;
    163                         if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
    164                                 if (!cmdline) {
    165                                         /* "-" means turn off -x and -v */
    166                                         if (p[0] == '\0')
    167                                                 xflag = vflag = 0;
    168                                         /* "--" means reset params */
    169                                         else if (*argptr == NULL)
    170 						setparam(argptr);
    171                                 }
    172 				break;	  /* "-" or  "--" terminates options */
    173 			}
    174 		} else if (c == '+') {
    175 			val = 0;
    176 		} else {
    177 			argptr--;
    178 			break;
    179 		}
    180 		while ((c = *p++) != '\0') {
    181 			if (c == 'c' && cmdline) {
    182 				char *q;
    183 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    184 				if (*p == '\0')
    185 #endif
    186 					q = *argptr++;
    187 				if (q == NULL || minusc != NULL)
    188 					error("Bad -c option");
    189 				minusc = q;
    190 #ifdef NOHACK
    191 				break;
    192 #endif
    193 			} else if (c == 'o') {
    194 				minus_o(*argptr, val);
    195 				if (*argptr)
    196 					argptr++;
    197 			} else {
    198 				setoption(c, val);
    199 			}
    200 		}
    201 	}
    202 }
    203 
    204 static void
    205 set_opt_val(int i, int val)
    206 {
    207 	int j;
    208 	int flag;
    209 
    210 	if (val && (flag = optlist[i].opt_set)) {
    211 		/* some options (eg vi/emacs) are mutually exclusive */
    212 		for (j = 0; j < NOPTS; j++)
    213 		    if (optlist[j].opt_set == flag)
    214 			optlist[j].val = 0;
    215 	}
    216 	optlist[i].val = val;
    217 #ifdef DEBUG
    218 	if (&optlist[i].val == &debug)
    219 		opentrace();
    220 #endif
    221 }
    222 
    223 STATIC void
    224 minus_o(char *name, int val)
    225 {
    226 	int i;
    227 
    228 	if (name == NULL) {
    229 		out1str("Current option settings\n");
    230 		for (i = 0; i < NOPTS; i++)
    231 			out1fmt("%-16s%s\n", optlist[i].name,
    232 				optlist[i].val ? "on" : "off");
    233 	} else {
    234 		for (i = 0; i < NOPTS; i++)
    235 			if (equal(name, optlist[i].name)) {
    236 				set_opt_val(i, val);
    237 				return;
    238 			}
    239 		error("Illegal option -o %s", name);
    240 	}
    241 }
    242 
    243 
    244 STATIC void
    245 setoption(int flag, int val)
    246 {
    247 	int i;
    248 
    249 	for (i = 0; i < NOPTS; i++)
    250 		if (optlist[i].letter == flag) {
    251 			set_opt_val( i, val );
    252 			return;
    253 		}
    254 	error("Illegal option -%c", flag);
    255 	/* NOTREACHED */
    256 }
    257 
    258 
    259 
    260 #ifdef mkinit
    261 INCLUDE "options.h"
    262 
    263 SHELLPROC {
    264 	int i;
    265 
    266 	for (i = 0; optlist[i].name; i++)
    267 		optlist[i].val = 0;
    268 	optschanged();
    269 
    270 }
    271 #endif
    272 
    273 
    274 /*
    275  * Set the shell parameters.
    276  */
    277 
    278 void
    279 setparam(char **argv)
    280 {
    281 	char **newparam;
    282 	char **ap;
    283 	int nparam;
    284 
    285 	for (nparam = 0 ; argv[nparam] ; nparam++);
    286 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    287 	while (*argv) {
    288 		*ap++ = savestr(*argv++);
    289 	}
    290 	*ap = NULL;
    291 	freeparam(&shellparam);
    292 	shellparam.malloc = 1;
    293 	shellparam.nparam = nparam;
    294 	shellparam.p = newparam;
    295 	shellparam.optnext = NULL;
    296 }
    297 
    298 
    299 /*
    300  * Free the list of positional parameters.
    301  */
    302 
    303 void
    304 freeparam(volatile struct shparam *param)
    305 {
    306 	char **ap;
    307 
    308 	if (param->malloc) {
    309 		for (ap = param->p ; *ap ; ap++)
    310 			ckfree(*ap);
    311 		ckfree(param->p);
    312 	}
    313 }
    314 
    315 
    316 
    317 /*
    318  * The shift builtin command.
    319  */
    320 
    321 int
    322 shiftcmd(int argc, char **argv)
    323 {
    324 	int n;
    325 	char **ap1, **ap2;
    326 
    327 	n = 1;
    328 	if (argc > 1)
    329 		n = number(argv[1]);
    330 	if (n > shellparam.nparam)
    331 		error("can't shift that many");
    332 	INTOFF;
    333 	shellparam.nparam -= n;
    334 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    335 		if (shellparam.malloc)
    336 			ckfree(*ap1);
    337 	}
    338 	ap2 = shellparam.p;
    339 	while ((*ap2++ = *ap1++) != NULL);
    340 	shellparam.optnext = NULL;
    341 	INTON;
    342 	return 0;
    343 }
    344 
    345 
    346 
    347 /*
    348  * The set command builtin.
    349  */
    350 
    351 int
    352 setcmd(int argc, char **argv)
    353 {
    354 	if (argc == 1)
    355 		return showvars(0, 0, 1);
    356 	INTOFF;
    357 	options(0);
    358 	optschanged();
    359 	if (*argptr != NULL) {
    360 		setparam(argptr);
    361 	}
    362 	INTON;
    363 	return 0;
    364 }
    365 
    366 
    367 void
    368 getoptsreset(value)
    369 	const char *value;
    370 {
    371 	if (number(value) == 1) {
    372 		shellparam.optnext = NULL;
    373 		shellparam.reset = 1;
    374 	}
    375 }
    376 
    377 /*
    378  * The getopts builtin.  Shellparam.optnext points to the next argument
    379  * to be processed.  Shellparam.optptr points to the next character to
    380  * be processed in the current argument.  If shellparam.optnext is NULL,
    381  * then it's the first time getopts has been called.
    382  */
    383 
    384 int
    385 getoptscmd(int argc, char **argv)
    386 {
    387 	char **optbase;
    388 
    389 	if (argc < 3)
    390 		error("Usage: getopts optstring var [arg]");
    391 	else if (argc == 3)
    392 		optbase = shellparam.p;
    393 	else
    394 		optbase = &argv[3];
    395 
    396 	if (shellparam.reset == 1) {
    397 		shellparam.optnext = optbase;
    398 		shellparam.optptr = NULL;
    399 		shellparam.reset = 0;
    400 	}
    401 
    402 	return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
    403 		       &shellparam.optptr);
    404 }
    405 
    406 STATIC int
    407 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr)
    408 {
    409 	char *p, *q;
    410 	char c = '?';
    411 	int done = 0;
    412 	int ind = 0;
    413 	int err = 0;
    414 	char s[10];
    415 
    416 	if ((p = *optpptr) == NULL || *p == '\0') {
    417 		/* Current word is done, advance */
    418 		if (*optnext == NULL)
    419 			return 1;
    420 		p = **optnext;
    421 		if (p == NULL || *p != '-' || *++p == '\0') {
    422 atend:
    423 			ind = *optnext - optfirst + 1;
    424 			*optnext = NULL;
    425 			p = NULL;
    426 			done = 1;
    427 			goto out;
    428 		}
    429 		(*optnext)++;
    430 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    431 			goto atend;
    432 	}
    433 
    434 	c = *p++;
    435 	for (q = optstr; *q != c; ) {
    436 		if (*q == '\0') {
    437 			if (optstr[0] == ':') {
    438 				s[0] = c;
    439 				s[1] = '\0';
    440 				err |= setvarsafe("OPTARG", s, 0);
    441 			} else {
    442 				outfmt(&errout, "Illegal option -%c\n", c);
    443 				(void) unsetvar("OPTARG", 0);
    444 			}
    445 			c = '?';
    446 			goto bad;
    447 		}
    448 		if (*++q == ':')
    449 			q++;
    450 	}
    451 
    452 	if (*++q == ':') {
    453 		if (*p == '\0' && (p = **optnext) == NULL) {
    454 			if (optstr[0] == ':') {
    455 				s[0] = c;
    456 				s[1] = '\0';
    457 				err |= setvarsafe("OPTARG", s, 0);
    458 				c = ':';
    459 			} else {
    460 				outfmt(&errout, "No arg for -%c option\n", c);
    461 				(void) unsetvar("OPTARG", 0);
    462 				c = '?';
    463 			}
    464 			goto bad;
    465 		}
    466 
    467 		if (p == **optnext)
    468 			(*optnext)++;
    469 		err |= setvarsafe("OPTARG", p, 0);
    470 		p = NULL;
    471 	} else
    472 		err |= setvarsafe("OPTARG", "", 0);
    473 	ind = *optnext - optfirst + 1;
    474 	goto out;
    475 
    476 bad:
    477 	ind = 1;
    478 	*optnext = NULL;
    479 	p = NULL;
    480 out:
    481 	*optpptr = p;
    482 	fmtstr(s, sizeof(s), "%d", ind);
    483 	err |= setvarsafe("OPTIND", s, VNOFUNC);
    484 	s[0] = c;
    485 	s[1] = '\0';
    486 	err |= setvarsafe(optvar, s, 0);
    487 	if (err) {
    488 		*optnext = NULL;
    489 		*optpptr = NULL;
    490 		flushall();
    491 		exraise(EXERROR);
    492 	}
    493 	return done;
    494 }
    495 
    496 /*
    497  * XXX - should get rid of.  have all builtins use getopt(3).  the
    498  * library getopt must have the BSD extension static variable "optreset"
    499  * otherwise it can't be used within the shell safely.
    500  *
    501  * Standard option processing (a la getopt) for builtin routines.  The
    502  * only argument that is passed to nextopt is the option string; the
    503  * other arguments are unnecessary.  It return the character, or '\0' on
    504  * end of input.
    505  */
    506 
    507 int
    508 nextopt(const char *optstring)
    509 {
    510 	char *p;
    511 	const char *q;
    512 	char c;
    513 
    514 	if ((p = optptr) == NULL || *p == '\0') {
    515 		p = *argptr;
    516 		if (p == NULL || *p != '-' || *++p == '\0')
    517 			return '\0';
    518 		argptr++;
    519 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    520 			return '\0';
    521 	}
    522 	c = *p++;
    523 	for (q = optstring ; *q != c ; ) {
    524 		if (*q == '\0')
    525 			error("Illegal option -%c", c);
    526 		if (*++q == ':')
    527 			q++;
    528 	}
    529 	if (*++q == ':') {
    530 		if (*p == '\0' && (p = *argptr++) == NULL)
    531 			error("No arg for -%c option", c);
    532 		optionarg = p;
    533 		p = NULL;
    534 	}
    535 	optptr = p;
    536 	return c;
    537 }
    538