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options.c revision 1.22 
      1 /*	$NetBSD: options.c,v 1.22 1997/01/11 02:04:43 tls 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 1.22 1997/01/11 02:04:43 tls 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 	shellparam.reset = 1;
    121 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    122 	while (*argptr) {
    123 		shellparam.nparam++;
    124 		argptr++;
    125 	}
    126 	optschanged();
    127 }
    128 
    129 
    130 void
    131 optschanged()
    132 {
    133 	setinteractive(iflag);
    134 #ifndef NO_HISTORY
    135 	histedit();
    136 #endif
    137 	setjobctl(mflag);
    138 }
    139 
    140 /*
    141  * Process shell options.  The global variable argptr contains a pointer
    142  * to the argument list; we advance it past the options.
    143  */
    144 
    145 STATIC void
    146 options(cmdline)
    147 	int cmdline;
    148 {
    149 	char *p;
    150 	int val;
    151 	int c;
    152 
    153 	if (cmdline)
    154 		minusc = NULL;
    155 	while ((p = *argptr) != NULL) {
    156 		argptr++;
    157 		if ((c = *p++) == '-') {
    158 			val = 1;
    159                         if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
    160                                 if (!cmdline) {
    161                                         /* "-" means turn off -x and -v */
    162                                         if (p[0] == '\0')
    163                                                 xflag = vflag = 0;
    164                                         /* "--" means reset params */
    165                                         else if (*argptr == NULL)
    166 						setparam(argptr);
    167                                 }
    168 				break;	  /* "-" or  "--" terminates options */
    169 			}
    170 		} else if (c == '+') {
    171 			val = 0;
    172 		} else {
    173 			argptr--;
    174 			break;
    175 		}
    176 		while ((c = *p++) != '\0') {
    177 			if (c == 'c' && cmdline) {
    178 				char *q;
    179 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    180 				if (*p == '\0')
    181 #endif
    182 					q = *argptr++;
    183 				if (q == NULL || minusc != NULL)
    184 					error("Bad -c option");
    185 				minusc = q;
    186 #ifdef NOHACK
    187 				break;
    188 #endif
    189 			} else if (c == 'o') {
    190 				minus_o(*argptr, val);
    191 				if (*argptr)
    192 					argptr++;
    193 			} else {
    194 				setoption(c, val);
    195 			}
    196 		}
    197 	}
    198 }
    199 
    200 STATIC void
    201 minus_o(name, val)
    202 	char *name;
    203 	int val;
    204 {
    205 	int i;
    206 
    207 	if (name == NULL) {
    208 		out1str("Current option settings\n");
    209 		for (i = 0; i < NOPTS; i++)
    210 			out1fmt("%-16s%s\n", optlist[i].name,
    211 				optlist[i].val ? "on" : "off");
    212 	} else {
    213 		for (i = 0; i < NOPTS; i++)
    214 			if (equal(name, optlist[i].name)) {
    215 				setoption(optlist[i].letter, val);
    216 				return;
    217 			}
    218 		error("Illegal option -o %s", name);
    219 	}
    220 }
    221 
    222 
    223 STATIC void
    224 setoption(flag, val)
    225 	char flag;
    226 	int val;
    227 	{
    228 	int i;
    229 
    230 	for (i = 0; i < NOPTS; i++)
    231 		if (optlist[i].letter == flag) {
    232 			optlist[i].val = val;
    233 			if (val) {
    234 				/* #%$ hack for ksh semantics */
    235 				if (flag == 'V')
    236 					Eflag = 0;
    237 				else if (flag == 'E')
    238 					Vflag = 0;
    239 			}
    240 			return;
    241 		}
    242 	error("Illegal option -%c", flag);
    243 }
    244 
    245 
    246 
    247 #ifdef mkinit
    248 INCLUDE "options.h"
    249 
    250 SHELLPROC {
    251 	int i;
    252 
    253 	for (i = 0; i < NOPTS; i++)
    254 		optlist[i].val = 0;
    255 	optschanged();
    256 
    257 }
    258 #endif
    259 
    260 
    261 /*
    262  * Set the shell parameters.
    263  */
    264 
    265 void
    266 setparam(argv)
    267 	char **argv;
    268 	{
    269 	char **newparam;
    270 	char **ap;
    271 	int nparam;
    272 
    273 	for (nparam = 0 ; argv[nparam] ; nparam++);
    274 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    275 	while (*argv) {
    276 		*ap++ = savestr(*argv++);
    277 	}
    278 	*ap = NULL;
    279 	freeparam(&shellparam);
    280 	shellparam.malloc = 1;
    281 	shellparam.nparam = nparam;
    282 	shellparam.p = newparam;
    283 	shellparam.optnext = NULL;
    284 }
    285 
    286 
    287 /*
    288  * Free the list of positional parameters.
    289  */
    290 
    291 void
    292 freeparam(param)
    293 	struct shparam *param;
    294 	{
    295 	char **ap;
    296 
    297 	if (param->malloc) {
    298 		for (ap = param->p ; *ap ; ap++)
    299 			ckfree(*ap);
    300 		ckfree(param->p);
    301 	}
    302 }
    303 
    304 
    305 
    306 /*
    307  * The shift builtin command.
    308  */
    309 
    310 int
    311 shiftcmd(argc, argv)
    312 	int argc;
    313 	char **argv;
    314 {
    315 	int n;
    316 	char **ap1, **ap2;
    317 
    318 	n = 1;
    319 	if (argc > 1)
    320 		n = number(argv[1]);
    321 	if (n > shellparam.nparam)
    322 		error("can't shift that many");
    323 	INTOFF;
    324 	shellparam.nparam -= n;
    325 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    326 		if (shellparam.malloc)
    327 			ckfree(*ap1);
    328 	}
    329 	ap2 = shellparam.p;
    330 	while ((*ap2++ = *ap1++) != NULL);
    331 	shellparam.optnext = NULL;
    332 	INTON;
    333 	return 0;
    334 }
    335 
    336 
    337 
    338 /*
    339  * The set command builtin.
    340  */
    341 
    342 int
    343 setcmd(argc, argv)
    344 	int argc;
    345 	char **argv;
    346 {
    347 	if (argc == 1)
    348 		return showvarscmd(argc, argv);
    349 	INTOFF;
    350 	options(0);
    351 	optschanged();
    352 	if (*argptr != NULL) {
    353 		setparam(argptr);
    354 	}
    355 	INTON;
    356 	return 0;
    357 }
    358 
    359 
    360 void
    361 getoptsreset(value)
    362 	const char *value;
    363 {
    364 	if (number(value) == 1) {
    365 		shellparam.optnext = NULL;
    366 		shellparam.reset = 1;
    367 	}
    368 }
    369 
    370 /*
    371  * The getopts builtin.  Shellparam.optnext points to the next argument
    372  * to be processed.  Shellparam.optptr points to the next character to
    373  * be processed in the current argument.  If shellparam.optnext is NULL,
    374  * then it's the first time getopts has been called.
    375  */
    376 
    377 int
    378 getoptscmd(argc, argv)
    379 	int argc;
    380 	char **argv;
    381 {
    382 	char **optbase;
    383 
    384 	if (argc < 3)
    385 		error("Usage: getopts optstring var [arg]");
    386 	else if (argc == 3)
    387 		optbase = shellparam.p;
    388 	else
    389 		optbase = &argv[3];
    390 
    391 	if (shellparam.reset == 1) {
    392 		shellparam.optnext = optbase;
    393 		shellparam.optptr = NULL;
    394 		shellparam.reset = 0;
    395 	}
    396 
    397 	return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
    398 		       &shellparam.optptr);
    399 }
    400 
    401 STATIC int
    402 getopts(optstr, optvar, optfirst, optnext, optptr)
    403 	char *optstr;
    404 	char *optvar;
    405 	char **optfirst;
    406 	char ***optnext;
    407 	char **optptr;
    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 = *optptr) == 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 			}
    442 			else {
    443 				out1fmt("Illegal option -%c\n", c);
    444 				(void) unsetvar("OPTARG");
    445 			}
    446 			c = '?';
    447 			goto bad;
    448 		}
    449 		if (*++q == ':')
    450 			q++;
    451 	}
    452 
    453 	if (*++q == ':') {
    454 		if (*p == '\0' && (p = **optnext) == NULL) {
    455 			if (optstr[0] == ':') {
    456 				s[0] = c;
    457 				s[1] = '\0';
    458 				err |= setvarsafe("OPTARG", s, 0);
    459 				c = ':';
    460 			}
    461 			else {
    462 				out1fmt("No arg for -%c option\n", c);
    463 				(void) unsetvar("OPTARG");
    464 				c = '?';
    465 			}
    466 			goto bad;
    467 		}
    468 
    469 		if (p == **optnext)
    470 			(*optnext)++;
    471 		setvarsafe("OPTARG", p, 0);
    472 		p = NULL;
    473 	}
    474 	else
    475 		setvarsafe("OPTARG", "", 0);
    476 	ind = *optnext - optfirst + 1;
    477 	goto out;
    478 
    479 bad:
    480 	ind = 1;
    481 	*optnext = NULL;
    482 	p = NULL;
    483 out:
    484 	*optptr = p;
    485 	fmtstr(s, sizeof(s), "%d", ind);
    486 	err |= setvarsafe("OPTIND", s, VNOFUNC);
    487 	s[0] = c;
    488 	s[1] = '\0';
    489 	err |= setvarsafe(optvar, s, 0);
    490 	if (err) {
    491 		*optnext = NULL;
    492 		*optptr = NULL;
    493 		flushall();
    494 		exraise(EXERROR);
    495 	}
    496 	return done;
    497 }
    498 
    499 /*
    500  * XXX - should get rid of.  have all builtins use getopt(3).  the
    501  * library getopt must have the BSD extension static variable "optreset"
    502  * otherwise it can't be used within the shell safely.
    503  *
    504  * Standard option processing (a la getopt) for builtin routines.  The
    505  * only argument that is passed to nextopt is the option string; the
    506  * other arguments are unnecessary.  It return the character, or '\0' on
    507  * end of input.
    508  */
    509 
    510 int
    511 nextopt(optstring)
    512 	char *optstring;
    513 	{
    514 	char *p, *q;
    515 	char c;
    516 
    517 	if ((p = optptr) == NULL || *p == '\0') {
    518 		p = *argptr;
    519 		if (p == NULL || *p != '-' || *++p == '\0')
    520 			return '\0';
    521 		argptr++;
    522 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    523 			return '\0';
    524 	}
    525 	c = *p++;
    526 	for (q = optstring ; *q != c ; ) {
    527 		if (*q == '\0')
    528 			error("Illegal option -%c", c);
    529 		if (*++q == ':')
    530 			q++;
    531 	}
    532 	if (*++q == ':') {
    533 		if (*p == '\0' && (p = *argptr++) == NULL)
    534 			error("No arg for -%c option", c);
    535 		optarg = p;
    536 		p = NULL;
    537 	}
    538 	optptr = p;
    539 	return c;
    540 }
    541