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options.c revision 1.18 
      1 /*	$NetBSD: options.c,v 1.18 1996/11/02 18:26:05 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 #ifndef lint
     40 #if 0
     41 static char sccsid[] = "@(#)options.c	8.2 (Berkeley) 5/4/95";
     42 #else
     43 static char rcsid[] = "$NetBSD: options.c,v 1.18 1996/11/02 18:26:05 christos Exp $";
     44 #endif
     45 #endif /* not lint */
     46 
     47 #include <signal.h>
     48 #include <unistd.h>
     49 #include <stdlib.h>
     50 
     51 #include "shell.h"
     52 #define DEFINE_OPTIONS
     53 #include "options.h"
     54 #undef DEFINE_OPTIONS
     55 #include "nodes.h"	/* for other header files */
     56 #include "eval.h"
     57 #include "jobs.h"
     58 #include "input.h"
     59 #include "output.h"
     60 #include "trap.h"
     61 #include "var.h"
     62 #include "memalloc.h"
     63 #include "error.h"
     64 #include "mystring.h"
     65 #ifndef NO_HISTORY
     66 #include "myhistedit.h"
     67 #endif
     68 
     69 char *arg0;			/* value of $0 */
     70 struct shparam shellparam;	/* current positional parameters */
     71 char **argptr;			/* argument list for builtin commands */
     72 char *optarg;			/* set by nextopt (like getopt) */
     73 char *optptr;			/* used by nextopt */
     74 
     75 char *minusc;			/* argument to -c option */
     76 
     77 
     78 STATIC void options __P((int));
     79 STATIC void minus_o __P((char *, int));
     80 STATIC void setoption __P((int, int));
     81 STATIC int getopts __P((char *, char *, char **, char ***, char **));
     82 
     83 
     84 /*
     85  * Process the shell command line arguments.
     86  */
     87 
     88 void
     89 procargs(argc, argv)
     90 	int argc;
     91 	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 	arg0 = argv[0];
    111 	if (sflag == 0 && minusc == NULL) {
    112 		commandname = arg0 = *argptr++;
    113 		setinputfile(commandname, 0);
    114 	}
    115 	/* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
    116 	if (argptr && minusc)
    117 	        arg0 = *argptr++;
    118 
    119 	shellparam.p = argptr;
    120 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    121 	while (*argptr) {
    122 		shellparam.nparam++;
    123 		argptr++;
    124 	}
    125 	optschanged();
    126 }
    127 
    128 
    129 void
    130 optschanged()
    131 {
    132 	setinteractive(iflag);
    133 #ifndef NO_HISTORY
    134 	histedit();
    135 #endif
    136 	setjobctl(mflag);
    137 }
    138 
    139 /*
    140  * Process shell options.  The global variable argptr contains a pointer
    141  * to the argument list; we advance it past the options.
    142  */
    143 
    144 STATIC void
    145 options(cmdline)
    146 	int cmdline;
    147 {
    148 	register char *p;
    149 	int val;
    150 	int c;
    151 
    152 	if (cmdline)
    153 		minusc = NULL;
    154 	while ((p = *argptr) != NULL) {
    155 		argptr++;
    156 		if ((c = *p++) == '-') {
    157 			val = 1;
    158                         if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
    159                                 if (!cmdline) {
    160                                         /* "-" means turn off -x and -v */
    161                                         if (p[0] == '\0')
    162                                                 xflag = vflag = 0;
    163                                         /* "--" means reset params */
    164                                         else if (*argptr == NULL)
    165 						setparam(argptr);
    166                                 }
    167 				break;	  /* "-" or  "--" terminates options */
    168 			}
    169 		} else if (c == '+') {
    170 			val = 0;
    171 		} else {
    172 			argptr--;
    173 			break;
    174 		}
    175 		while ((c = *p++) != '\0') {
    176 			if (c == 'c' && cmdline) {
    177 				char *q;
    178 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    179 				if (*p == '\0')
    180 #endif
    181 					q = *argptr++;
    182 				if (q == NULL || minusc != NULL)
    183 					error("Bad -c option");
    184 				minusc = q;
    185 #ifdef NOHACK
    186 				break;
    187 #endif
    188 			} else if (c == 'o') {
    189 				minus_o(*argptr, val);
    190 				if (*argptr)
    191 					argptr++;
    192 			} else {
    193 				setoption(c, val);
    194 			}
    195 		}
    196 	}
    197 }
    198 
    199 STATIC void
    200 minus_o(name, val)
    201 	char *name;
    202 	int val;
    203 {
    204 	int i;
    205 
    206 	if (name == NULL) {
    207 		out1str("Current option settings\n");
    208 		for (i = 0; i < NOPTS; i++)
    209 			out1fmt("%-16s%s\n", optlist[i].name,
    210 				optlist[i].val ? "on" : "off");
    211 	} else {
    212 		for (i = 0; i < NOPTS; i++)
    213 			if (equal(name, optlist[i].name)) {
    214 				setoption(optlist[i].letter, val);
    215 				return;
    216 			}
    217 		error("Illegal option -o %s", name);
    218 	}
    219 }
    220 
    221 
    222 STATIC void
    223 setoption(flag, val)
    224 	char flag;
    225 	int val;
    226 	{
    227 	int i;
    228 
    229 	for (i = 0; i < NOPTS; i++)
    230 		if (optlist[i].letter == flag) {
    231 			optlist[i].val = val;
    232 			if (val) {
    233 				/* #%$ hack for ksh semantics */
    234 				if (flag == 'V')
    235 					Eflag = 0;
    236 				else if (flag == 'E')
    237 					Vflag = 0;
    238 			}
    239 			return;
    240 		}
    241 	error("Illegal option -%c", flag);
    242 }
    243 
    244 
    245 
    246 #ifdef mkinit
    247 INCLUDE "options.h"
    248 
    249 SHELLPROC {
    250 	int i;
    251 
    252 	for (i = 0; i < NOPTS; i++)
    253 		optlist[i].val = 0;
    254 	optschanged();
    255 
    256 }
    257 #endif
    258 
    259 
    260 /*
    261  * Set the shell parameters.
    262  */
    263 
    264 void
    265 setparam(argv)
    266 	char **argv;
    267 	{
    268 	char **newparam;
    269 	char **ap;
    270 	int nparam;
    271 
    272 	for (nparam = 0 ; argv[nparam] ; nparam++);
    273 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    274 	while (*argv) {
    275 		*ap++ = savestr(*argv++);
    276 	}
    277 	*ap = NULL;
    278 	freeparam(&shellparam);
    279 	shellparam.malloc = 1;
    280 	shellparam.nparam = nparam;
    281 	shellparam.p = newparam;
    282 	shellparam.optnext = NULL;
    283 }
    284 
    285 
    286 /*
    287  * Free the list of positional parameters.
    288  */
    289 
    290 void
    291 freeparam(param)
    292 	struct shparam *param;
    293 	{
    294 	char **ap;
    295 
    296 	if (param->malloc) {
    297 		for (ap = param->p ; *ap ; ap++)
    298 			ckfree(*ap);
    299 		ckfree(param->p);
    300 	}
    301 }
    302 
    303 
    304 
    305 /*
    306  * The shift builtin command.
    307  */
    308 
    309 int
    310 shiftcmd(argc, argv)
    311 	int argc;
    312 	char **argv;
    313 {
    314 	int n;
    315 	char **ap1, **ap2;
    316 
    317 	n = 1;
    318 	if (argc > 1)
    319 		n = number(argv[1]);
    320 	if (n > shellparam.nparam)
    321 		error("can't shift that many");
    322 	INTOFF;
    323 	shellparam.nparam -= n;
    324 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    325 		if (shellparam.malloc)
    326 			ckfree(*ap1);
    327 	}
    328 	ap2 = shellparam.p;
    329 	while ((*ap2++ = *ap1++) != NULL);
    330 	shellparam.optnext = NULL;
    331 	INTON;
    332 	return 0;
    333 }
    334 
    335 
    336 
    337 /*
    338  * The set command builtin.
    339  */
    340 
    341 int
    342 setcmd(argc, argv)
    343 	int argc;
    344 	char **argv;
    345 {
    346 	if (argc == 1)
    347 		return showvarscmd(argc, argv);
    348 	INTOFF;
    349 	options(0);
    350 	optschanged();
    351 	if (*argptr != NULL) {
    352 		setparam(argptr);
    353 	}
    354 	INTON;
    355 	return 0;
    356 }
    357 
    358 
    359 void
    360 getoptsreset(value)
    361 	const char *value;
    362 {
    363 	if (number(value) == 1)
    364 		shellparam.optnext = NULL;
    365 }
    366 
    367 /*
    368  * The getopts builtin.  Shellparam.optnext points to the next argument
    369  * to be processed.  Shellparam.optptr points to the next character to
    370  * be processed in the current argument.  If shellparam.optnext is NULL,
    371  * then it's the first time getopts has been called.
    372  */
    373 
    374 int
    375 getoptscmd(argc, argv)
    376 	int argc;
    377 	char **argv;
    378 {
    379 	char **optbase;
    380 
    381 	if (argc < 3)
    382 		error("Usage: getopts optstring var [arg]");
    383 	else if (argc == 3)
    384 		optbase = shellparam.p;
    385 	else
    386 		optbase = &argv[3];
    387 
    388 	if (shellparam.optnext == NULL) {
    389 		shellparam.optnext = optbase;
    390 		shellparam.optptr = NULL;
    391 	}
    392 
    393 	return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
    394 		       &shellparam.optptr);
    395 }
    396 
    397 STATIC int
    398 getopts(optstr, optvar, optfirst, optnext, optptr)
    399 	char *optstr;
    400 	char *optvar;
    401 	char **optfirst;
    402 	char ***optnext;
    403 	char **optptr;
    404 {
    405 	register char *p, *q;
    406 	char c = '?';
    407 	int done = 0;
    408 	int ind = 0;
    409 	int err = 0;
    410 	char s[10];
    411 
    412 	if ((p = *optptr) == NULL || *p == '\0') {
    413 		/* Current word is done, advance */
    414 		p = **optnext;
    415 		if (p == NULL || *p != '-' || *++p == '\0') {
    416 atend:
    417 			**optnext = NULL;
    418 			ind = *optnext - optfirst + 1;
    419 			done = 1;
    420 			goto out;
    421 		}
    422 		(*optnext)++;
    423 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    424 			goto atend;
    425 	}
    426 
    427 	c = *p++;
    428 	for (q = optstr; *q != c; ) {
    429 		if (*q == '\0') {
    430 			if (optstr[0] == ':') {
    431 				s[0] = c;
    432 				s[1] = '\0';
    433 				err |= setvarsafe("OPTARG", s, 0);
    434 			}
    435 			else {
    436 				out1fmt("Illegal option -%c\n", c);
    437 				(void) unsetvar("OPTARG");
    438 			}
    439 			c = '?';
    440 			goto bad;
    441 		}
    442 		if (*++q == ':')
    443 			q++;
    444 	}
    445 
    446 	if (*++q == ':') {
    447 		if (*p == '\0' && (p = **optnext) == NULL) {
    448 			if (optstr[0] == ':') {
    449 				s[0] = c;
    450 				s[1] = '\0';
    451 				err |= setvarsafe("OPTARG", s, 0);
    452 				c = ':';
    453 			}
    454 			else {
    455 				out1fmt("No arg for -%c option\n", c);
    456 				(void) unsetvar("OPTARG");
    457 				c = '?';
    458 			}
    459 			ind = 1;
    460 			*optnext = NULL;
    461 			goto bad;
    462 		}
    463 
    464 		if (p == **optnext)
    465 			(*optnext)++;
    466 		ind = *optnext - optfirst + 1;
    467 		setvarsafe("OPTARG", p, 0);
    468 		p = NULL;
    469 		goto out;
    470 	}
    471 bad:
    472 	ind = 1;
    473 	*optnext = NULL;
    474 	p = NULL;
    475 out:
    476 	*optptr = p;
    477 	fmtstr(s, sizeof(s), "%d", ind);
    478 	err |= setvarsafe("OPTIND", s, VNOFUNC);
    479 	s[0] = c;
    480 	s[1] = '\0';
    481 	err |= setvarsafe(optvar, s, 0);
    482 	if (err) {
    483 		*optnext = NULL;
    484 		*optptr = NULL;
    485 		flushall();
    486 		exraise(EXERROR);
    487 	}
    488 	return done;
    489 }
    490 
    491 /*
    492  * XXX - should get rid of.  have all builtins use getopt(3).  the
    493  * library getopt must have the BSD extension static variable "optreset"
    494  * otherwise it can't be used within the shell safely.
    495  *
    496  * Standard option processing (a la getopt) for builtin routines.  The
    497  * only argument that is passed to nextopt is the option string; the
    498  * other arguments are unnecessary.  It return the character, or '\0' on
    499  * end of input.
    500  */
    501 
    502 int
    503 nextopt(optstring)
    504 	char *optstring;
    505 	{
    506 	register char *p, *q;
    507 	char c;
    508 
    509 	if ((p = optptr) == NULL || *p == '\0') {
    510 		p = *argptr;
    511 		if (p == NULL || *p != '-' || *++p == '\0')
    512 			return '\0';
    513 		argptr++;
    514 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    515 			return '\0';
    516 	}
    517 	c = *p++;
    518 	for (q = optstring ; *q != c ; ) {
    519 		if (*q == '\0')
    520 			error("Illegal option -%c", c);
    521 		if (*++q == ':')
    522 			q++;
    523 	}
    524 	if (*++q == ':') {
    525 		if (*p == '\0' && (p = *argptr++) == NULL)
    526 			error("No arg for -%c option", c);
    527 		optarg = p;
    528 		p = NULL;
    529 	}
    530 	optptr = p;
    531 	return c;
    532 }
    533