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options.c revision 1.14 
      1 /*	$NetBSD: options.c,v 1.14 1995/05/11 21:29:46 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 1.14 1995/05/11 21:29:46 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 
     82 
     83 /*
     84  * Process the shell command line arguments.
     85  */
     86 
     87 void
     88 procargs(argc, argv)
     89 	int argc;
     90 	char **argv;
     91 {
     92 	int i;
     93 
     94 	argptr = argv;
     95 	if (argc > 0)
     96 		argptr++;
     97 	for (i = 0; i < NOPTS; i++)
     98 		optlist[i].val = 2;
     99 	options(1);
    100 	if (*argptr == NULL && minusc == NULL)
    101 		sflag = 1;
    102 	if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
    103 		iflag = 1;
    104 	if (mflag == 2)
    105 		mflag = iflag;
    106 	for (i = 0; i < NOPTS; i++)
    107 		if (optlist[i].val == 2)
    108 			optlist[i].val = 0;
    109 	arg0 = argv[0];
    110 	if (sflag == 0 && minusc == NULL) {
    111 		commandname = arg0 = *argptr++;
    112 		setinputfile(commandname, 0);
    113 	}
    114 	shellparam.p = argptr;
    115 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    116 	while (*argptr) {
    117 		shellparam.nparam++;
    118 		argptr++;
    119 	}
    120 	optschanged();
    121 }
    122 
    123 
    124 void
    125 optschanged()
    126 {
    127 	setinteractive(iflag);
    128 #ifndef NO_HISTORY
    129 	histedit();
    130 #endif
    131 	setjobctl(mflag);
    132 }
    133 
    134 /*
    135  * Process shell options.  The global variable argptr contains a pointer
    136  * to the argument list; we advance it past the options.
    137  */
    138 
    139 STATIC void
    140 options(cmdline)
    141 	int cmdline;
    142 {
    143 	register char *p;
    144 	int val;
    145 	int c;
    146 
    147 	if (cmdline)
    148 		minusc = NULL;
    149 	while ((p = *argptr) != NULL) {
    150 		argptr++;
    151 		if ((c = *p++) == '-') {
    152 			val = 1;
    153                         if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
    154                                 if (!cmdline) {
    155                                         /* "-" means turn off -x and -v */
    156                                         if (p[0] == '\0')
    157                                                 xflag = vflag = 0;
    158                                         /* "--" means reset params */
    159                                         else if (*argptr == NULL)
    160 						setparam(argptr);
    161                                 }
    162 				break;	  /* "-" or  "--" terminates options */
    163 			}
    164 		} else if (c == '+') {
    165 			val = 0;
    166 		} else {
    167 			argptr--;
    168 			break;
    169 		}
    170 		while ((c = *p++) != '\0') {
    171 			if (c == 'c' && cmdline) {
    172 				char *q;
    173 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    174 				if (*p == '\0')
    175 #endif
    176 					q = *argptr++;
    177 				if (q == NULL || minusc != NULL)
    178 					error("Bad -c option");
    179 				minusc = q;
    180 #ifdef NOHACK
    181 				break;
    182 #endif
    183 			} else if (c == 'o') {
    184 				minus_o(*argptr, val);
    185 				if (*argptr)
    186 					argptr++;
    187 			} else {
    188 				setoption(c, val);
    189 			}
    190 		}
    191 	}
    192 }
    193 
    194 STATIC void
    195 minus_o(name, val)
    196 	char *name;
    197 	int val;
    198 {
    199 	int i;
    200 
    201 	if (name == NULL) {
    202 		out1str("Current option settings\n");
    203 		for (i = 0; i < NOPTS; i++)
    204 			out1fmt("%-16s%s\n", optlist[i].name,
    205 				optlist[i].val ? "on" : "off");
    206 	} else {
    207 		for (i = 0; i < NOPTS; i++)
    208 			if (equal(name, optlist[i].name)) {
    209 				setoption(optlist[i].letter, val);
    210 				return;
    211 			}
    212 		error("Illegal option -o %s", name);
    213 	}
    214 }
    215 
    216 
    217 STATIC void
    218 setoption(flag, val)
    219 	char flag;
    220 	int val;
    221 	{
    222 	int i;
    223 
    224 	for (i = 0; i < NOPTS; i++)
    225 		if (optlist[i].letter == flag) {
    226 			optlist[i].val = val;
    227 			if (val) {
    228 				/* #%$ hack for ksh semantics */
    229 				if (flag == 'V')
    230 					Eflag = 0;
    231 				else if (flag == 'E')
    232 					Vflag = 0;
    233 			}
    234 			return;
    235 		}
    236 	error("Illegal option -%c", flag);
    237 }
    238 
    239 
    240 
    241 #ifdef mkinit
    242 INCLUDE "options.h"
    243 
    244 SHELLPROC {
    245 	int i;
    246 
    247 	for (i = 0; i < NOPTS; i++)
    248 		optlist[i].val = 0;
    249 	optschanged();
    250 
    251 }
    252 #endif
    253 
    254 
    255 /*
    256  * Set the shell parameters.
    257  */
    258 
    259 void
    260 setparam(argv)
    261 	char **argv;
    262 	{
    263 	char **newparam;
    264 	char **ap;
    265 	int nparam;
    266 
    267 	for (nparam = 0 ; argv[nparam] ; nparam++);
    268 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    269 	while (*argv) {
    270 		*ap++ = savestr(*argv++);
    271 	}
    272 	*ap = NULL;
    273 	freeparam(&shellparam);
    274 	shellparam.malloc = 1;
    275 	shellparam.nparam = nparam;
    276 	shellparam.p = newparam;
    277 	shellparam.optnext = NULL;
    278 }
    279 
    280 
    281 /*
    282  * Free the list of positional parameters.
    283  */
    284 
    285 void
    286 freeparam(param)
    287 	struct shparam *param;
    288 	{
    289 	char **ap;
    290 
    291 	if (param->malloc) {
    292 		for (ap = param->p ; *ap ; ap++)
    293 			ckfree(*ap);
    294 		ckfree(param->p);
    295 	}
    296 }
    297 
    298 
    299 
    300 /*
    301  * The shift builtin command.
    302  */
    303 
    304 int
    305 shiftcmd(argc, argv)
    306 	int argc;
    307 	char **argv;
    308 {
    309 	int n;
    310 	char **ap1, **ap2;
    311 
    312 	n = 1;
    313 	if (argc > 1)
    314 		n = number(argv[1]);
    315 	if (n > shellparam.nparam)
    316 		error("can't shift that many");
    317 	INTOFF;
    318 	shellparam.nparam -= n;
    319 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    320 		if (shellparam.malloc)
    321 			ckfree(*ap1);
    322 	}
    323 	ap2 = shellparam.p;
    324 	while ((*ap2++ = *ap1++) != NULL);
    325 	shellparam.optnext = NULL;
    326 	INTON;
    327 	return 0;
    328 }
    329 
    330 
    331 
    332 /*
    333  * The set command builtin.
    334  */
    335 
    336 int
    337 setcmd(argc, argv)
    338 	int argc;
    339 	char **argv;
    340 {
    341 	if (argc == 1)
    342 		return showvarscmd(argc, argv);
    343 	INTOFF;
    344 	options(0);
    345 	optschanged();
    346 	if (*argptr != NULL) {
    347 		setparam(argptr);
    348 	}
    349 	INTON;
    350 	return 0;
    351 }
    352 
    353 
    354 /*
    355  * The getopts builtin.  Shellparam.optnext points to the next argument
    356  * to be processed.  Shellparam.optptr points to the next character to
    357  * be processed in the current argument.  If shellparam.optnext is NULL,
    358  * then it's the first time getopts has been called.
    359  */
    360 
    361 int
    362 getoptscmd(argc, argv)
    363 	int argc;
    364 	char **argv;
    365 {
    366 	register char *p, *q;
    367 	char c;
    368 	char s[10];
    369 
    370 	if (argc != 3)
    371 		error("Usage: getopts optstring var");
    372 	if (shellparam.optnext == NULL) {
    373 		shellparam.optnext = shellparam.p;
    374 		shellparam.optptr = NULL;
    375 	}
    376 	if ((p = shellparam.optptr) == NULL || *p == '\0') {
    377 		p = *shellparam.optnext;
    378 		if (p == NULL || *p != '-' || *++p == '\0') {
    379 atend:
    380 			fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
    381 			setvar("OPTIND", s, 0);
    382 			shellparam.optnext = NULL;
    383 			return 1;
    384 		}
    385 		shellparam.optnext++;
    386 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    387 			goto atend;
    388 	}
    389 	c = *p++;
    390 	for (q = argv[1] ; *q != c ; ) {
    391 		if (*q == '\0') {
    392 			out1fmt("Illegal option -%c\n", c);
    393 			c = '?';
    394 			goto out;
    395 		}
    396 		if (*++q == ':')
    397 			q++;
    398 	}
    399 	if (*++q == ':') {
    400 		if (*p == '\0' && (p = *shellparam.optnext) == NULL) {
    401 			out1fmt("No arg for -%c option\n", c);
    402 			c = '?';
    403 			goto out;
    404 		}
    405 		shellparam.optnext++;
    406 		setvar("OPTARG", p, 0);
    407 		p = NULL;
    408 	}
    409 out:
    410 	shellparam.optptr = p;
    411 	s[0] = c;
    412 	s[1] = '\0';
    413 	setvar(argv[2], s, 0);
    414 	return 0;
    415 }
    416 
    417 /*
    418  * XXX - should get rid of.  have all builtins use getopt(3).  the
    419  * library getopt must have the BSD extension static variable "optreset"
    420  * otherwise it can't be used within the shell safely.
    421  *
    422  * Standard option processing (a la getopt) for builtin routines.  The
    423  * only argument that is passed to nextopt is the option string; the
    424  * other arguments are unnecessary.  It return the character, or '\0' on
    425  * end of input.
    426  */
    427 
    428 int
    429 nextopt(optstring)
    430 	char *optstring;
    431 	{
    432 	register char *p, *q;
    433 	char c;
    434 
    435 	if ((p = optptr) == NULL || *p == '\0') {
    436 		p = *argptr;
    437 		if (p == NULL || *p != '-' || *++p == '\0')
    438 			return '\0';
    439 		argptr++;
    440 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    441 			return '\0';
    442 	}
    443 	c = *p++;
    444 	for (q = optstring ; *q != c ; ) {
    445 		if (*q == '\0')
    446 			error("Illegal option -%c", c);
    447 		if (*++q == ':')
    448 			q++;
    449 	}
    450 	if (*++q == ':') {
    451 		if (*p == '\0' && (p = *argptr++) == NULL)
    452 			error("No arg for -%c option", c);
    453 		optarg = p;
    454 		p = NULL;
    455 	}
    456 	optptr = p;
    457 	return c;
    458 }
    459