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options.c revision 1.16 
      1 /*	$NetBSD: options.c,v 1.16 1996/06/25 16:47:43 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 1.16 1996/06/25 16:47:43 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 	shellparam.p = argptr;
    116 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    117 	while (*argptr) {
    118 		shellparam.nparam++;
    119 		argptr++;
    120 	}
    121 	optschanged();
    122 }
    123 
    124 
    125 void
    126 optschanged()
    127 {
    128 	setinteractive(iflag);
    129 #ifndef NO_HISTORY
    130 	histedit();
    131 #endif
    132 	setjobctl(mflag);
    133 }
    134 
    135 /*
    136  * Process shell options.  The global variable argptr contains a pointer
    137  * to the argument list; we advance it past the options.
    138  */
    139 
    140 STATIC void
    141 options(cmdline)
    142 	int cmdline;
    143 {
    144 	register char *p;
    145 	int val;
    146 	int c;
    147 
    148 	if (cmdline)
    149 		minusc = NULL;
    150 	while ((p = *argptr) != NULL) {
    151 		argptr++;
    152 		if ((c = *p++) == '-') {
    153 			val = 1;
    154                         if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
    155                                 if (!cmdline) {
    156                                         /* "-" means turn off -x and -v */
    157                                         if (p[0] == '\0')
    158                                                 xflag = vflag = 0;
    159                                         /* "--" means reset params */
    160                                         else if (*argptr == NULL)
    161 						setparam(argptr);
    162                                 }
    163 				break;	  /* "-" or  "--" terminates options */
    164 			}
    165 		} else if (c == '+') {
    166 			val = 0;
    167 		} else {
    168 			argptr--;
    169 			break;
    170 		}
    171 		while ((c = *p++) != '\0') {
    172 			if (c == 'c' && cmdline) {
    173 				char *q;
    174 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    175 				if (*p == '\0')
    176 #endif
    177 					q = *argptr++;
    178 				if (q == NULL || minusc != NULL)
    179 					error("Bad -c option");
    180 				minusc = q;
    181 #ifdef NOHACK
    182 				break;
    183 #endif
    184 			} else if (c == 'o') {
    185 				minus_o(*argptr, val);
    186 				if (*argptr)
    187 					argptr++;
    188 			} else {
    189 				setoption(c, val);
    190 			}
    191 		}
    192 	}
    193 }
    194 
    195 STATIC void
    196 minus_o(name, val)
    197 	char *name;
    198 	int val;
    199 {
    200 	int i;
    201 
    202 	if (name == NULL) {
    203 		out1str("Current option settings\n");
    204 		for (i = 0; i < NOPTS; i++)
    205 			out1fmt("%-16s%s\n", optlist[i].name,
    206 				optlist[i].val ? "on" : "off");
    207 	} else {
    208 		for (i = 0; i < NOPTS; i++)
    209 			if (equal(name, optlist[i].name)) {
    210 				setoption(optlist[i].letter, val);
    211 				return;
    212 			}
    213 		error("Illegal option -o %s", name);
    214 	}
    215 }
    216 
    217 
    218 STATIC void
    219 setoption(flag, val)
    220 	char flag;
    221 	int val;
    222 	{
    223 	int i;
    224 
    225 	for (i = 0; i < NOPTS; i++)
    226 		if (optlist[i].letter == flag) {
    227 			optlist[i].val = val;
    228 			if (val) {
    229 				/* #%$ hack for ksh semantics */
    230 				if (flag == 'V')
    231 					Eflag = 0;
    232 				else if (flag == 'E')
    233 					Vflag = 0;
    234 			}
    235 			return;
    236 		}
    237 	error("Illegal option -%c", flag);
    238 }
    239 
    240 
    241 
    242 #ifdef mkinit
    243 INCLUDE "options.h"
    244 
    245 SHELLPROC {
    246 	int i;
    247 
    248 	for (i = 0; i < NOPTS; i++)
    249 		optlist[i].val = 0;
    250 	optschanged();
    251 
    252 }
    253 #endif
    254 
    255 
    256 /*
    257  * Set the shell parameters.
    258  */
    259 
    260 void
    261 setparam(argv)
    262 	char **argv;
    263 	{
    264 	char **newparam;
    265 	char **ap;
    266 	int nparam;
    267 
    268 	for (nparam = 0 ; argv[nparam] ; nparam++);
    269 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    270 	while (*argv) {
    271 		*ap++ = savestr(*argv++);
    272 	}
    273 	*ap = NULL;
    274 	freeparam(&shellparam);
    275 	shellparam.malloc = 1;
    276 	shellparam.nparam = nparam;
    277 	shellparam.p = newparam;
    278 	shellparam.optnext = NULL;
    279 }
    280 
    281 
    282 /*
    283  * Free the list of positional parameters.
    284  */
    285 
    286 void
    287 freeparam(param)
    288 	struct shparam *param;
    289 	{
    290 	char **ap;
    291 
    292 	if (param->malloc) {
    293 		for (ap = param->p ; *ap ; ap++)
    294 			ckfree(*ap);
    295 		ckfree(param->p);
    296 	}
    297 }
    298 
    299 
    300 
    301 /*
    302  * The shift builtin command.
    303  */
    304 
    305 int
    306 shiftcmd(argc, argv)
    307 	int argc;
    308 	char **argv;
    309 {
    310 	int n;
    311 	char **ap1, **ap2;
    312 
    313 	n = 1;
    314 	if (argc > 1)
    315 		n = number(argv[1]);
    316 	if (n > shellparam.nparam)
    317 		error("can't shift that many");
    318 	INTOFF;
    319 	shellparam.nparam -= n;
    320 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    321 		if (shellparam.malloc)
    322 			ckfree(*ap1);
    323 	}
    324 	ap2 = shellparam.p;
    325 	while ((*ap2++ = *ap1++) != NULL);
    326 	shellparam.optnext = NULL;
    327 	INTON;
    328 	return 0;
    329 }
    330 
    331 
    332 
    333 /*
    334  * The set command builtin.
    335  */
    336 
    337 int
    338 setcmd(argc, argv)
    339 	int argc;
    340 	char **argv;
    341 {
    342 	if (argc == 1)
    343 		return showvarscmd(argc, argv);
    344 	INTOFF;
    345 	options(0);
    346 	optschanged();
    347 	if (*argptr != NULL) {
    348 		setparam(argptr);
    349 	}
    350 	INTON;
    351 	return 0;
    352 }
    353 
    354 
    355 void
    356 getoptsreset(value)
    357 	const char *value;
    358 {
    359 	if (number(value) == 1)
    360 		shellparam.optnext;
    361 }
    362 
    363 /*
    364  * The getopts builtin.  Shellparam.optnext points to the next argument
    365  * to be processed.  Shellparam.optptr points to the next character to
    366  * be processed in the current argument.  If shellparam.optnext is NULL,
    367  * then it's the first time getopts has been called.
    368  */
    369 
    370 int
    371 getoptscmd(argc, argv)
    372 	int argc;
    373 	char **argv;
    374 {
    375 	char **optbase;
    376 
    377 	if (argc < 3)
    378 		error("Usage: getopts optstring var [arg]");
    379 	else if (argc == 3)
    380 		optbase = shellparam.p;
    381 	else
    382 		optbase = &argv[3];
    383 
    384 	if (shellparam.optnext == NULL) {
    385 		shellparam.optnext = optbase;
    386 		shellparam.optptr = NULL;
    387 	}
    388 
    389 	return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
    390 		       &shellparam.optptr);
    391 }
    392 
    393 STATIC int
    394 getopts(optstr, optvar, optfirst, optnext, optptr)
    395 	char *optstr;
    396 	char *optvar;
    397 	char **optfirst;
    398 	char ***optnext;
    399 	char **optptr;
    400 {
    401 	register char *p, *q;
    402 	char c = '?';
    403 	int done = 0;
    404 	int ind = 0;
    405 	int err = 0;
    406 	char s[10];
    407 
    408 	if ((p = *optptr) == NULL || *p == '\0') {
    409 		/* Current word is done, advance */
    410 		p = **optnext;
    411 		if (p == NULL || *p != '-' || *++p == '\0') {
    412 atend:
    413 			**optnext = NULL;
    414 			ind = *optnext - optfirst + 1;
    415 			done = 1;
    416 			goto out;
    417 		}
    418 		(*optnext)++;
    419 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    420 			goto atend;
    421 	}
    422 
    423 	c = *p++;
    424 	for (q = optstr; *q != c; ) {
    425 		if (*q == '\0') {
    426 			if (optstr[0] == ':') {
    427 				s[0] = c;
    428 				s[1] = '\0';
    429 				err |= setvarsafe("OPTARG", s, 0);
    430 			}
    431 			else {
    432 				out1fmt("Illegal option -%c\n", c);
    433 				(void) unsetvar("OPTARG");
    434 			}
    435 			c = '?';
    436 			goto bad;
    437 		}
    438 		if (*++q == ':')
    439 			q++;
    440 	}
    441 
    442 	if (*++q == ':') {
    443 		if (*p == '\0' && (p = **optnext) == NULL) {
    444 			if (optstr[0] == ':') {
    445 				s[0] = c;
    446 				s[1] = '\0';
    447 				err |= setvarsafe("OPTARG", s, 0);
    448 				c = ':';
    449 			}
    450 			else {
    451 				out1fmt("No arg for -%c option\n", c);
    452 				(void) unsetvar("OPTARG");
    453 				c = '?';
    454 			}
    455 			ind = 1;
    456 			*optnext = NULL;
    457 			goto bad;
    458 		}
    459 
    460 		if (p == **optnext)
    461 			(*optnext)++;
    462 		ind = *optnext - optfirst + 1;
    463 		setvarsafe("OPTARG", p, 0);
    464 		p = NULL;
    465 		goto out;
    466 	}
    467 bad:
    468 	ind = 1;
    469 	*optnext = NULL;
    470 	p = NULL;
    471 out:
    472 	*optptr = p;
    473 	fmtstr(s, sizeof(s), "%d", ind);
    474 	err |= setvarsafe("OPTIND", s, VNOFUNC);
    475 	s[0] = c;
    476 	s[1] = '\0';
    477 	err |= setvarsafe(optvar, s, 0);
    478 	if (err) {
    479 		*optnext = NULL;
    480 		*optptr = NULL;
    481 		flushall();
    482 		exraise(EXERROR);
    483 	}
    484 	return done;
    485 }
    486 
    487 /*
    488  * XXX - should get rid of.  have all builtins use getopt(3).  the
    489  * library getopt must have the BSD extension static variable "optreset"
    490  * otherwise it can't be used within the shell safely.
    491  *
    492  * Standard option processing (a la getopt) for builtin routines.  The
    493  * only argument that is passed to nextopt is the option string; the
    494  * other arguments are unnecessary.  It return the character, or '\0' on
    495  * end of input.
    496  */
    497 
    498 int
    499 nextopt(optstring)
    500 	char *optstring;
    501 	{
    502 	register char *p, *q;
    503 	char c;
    504 
    505 	if ((p = optptr) == NULL || *p == '\0') {
    506 		p = *argptr;
    507 		if (p == NULL || *p != '-' || *++p == '\0')
    508 			return '\0';
    509 		argptr++;
    510 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    511 			return '\0';
    512 	}
    513 	c = *p++;
    514 	for (q = optstring ; *q != c ; ) {
    515 		if (*q == '\0')
    516 			error("Illegal option -%c", c);
    517 		if (*++q == ':')
    518 			q++;
    519 	}
    520 	if (*++q == ':') {
    521 		if (*p == '\0' && (p = *argptr++) == NULL)
    522 			error("No arg for -%c option", c);
    523 		optarg = p;
    524 		p = NULL;
    525 	}
    526 	optptr = p;
    527 	return c;
    528 }
    529