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options.c revision 1.13 
      1 /*	$NetBSD: options.c,v 1.13 1995/03/26 17:25:10 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	8.1 (Berkeley) 5/31/93";
     42 #else
     43 static char rcsid[] = "$NetBSD: options.c,v 1.13 1995/03/26 17:25:10 christos Exp $";
     44 #endif
     45 #endif /* not lint */
     46 
     47 #include "shell.h"
     48 #define DEFINE_OPTIONS
     49 #include "options.h"
     50 #undef DEFINE_OPTIONS
     51 #include "nodes.h"	/* for other header files */
     52 #include "eval.h"
     53 #include "jobs.h"
     54 #include "input.h"
     55 #include "output.h"
     56 #include "trap.h"
     57 #include "var.h"
     58 #include "memalloc.h"
     59 #include "error.h"
     60 #include "mystring.h"
     61 #include "extern.h"
     62 #include <unistd.h>
     63 
     64 char *arg0;			/* value of $0 */
     65 struct shparam shellparam;	/* current positional parameters */
     66 char **argptr;			/* argument list for builtin commands */
     67 char *optarg;			/* set by nextopt (like getopt) */
     68 char *optptr;			/* used by nextopt */
     69 
     70 char *minusc;			/* argument to -c option */
     71 
     72 
     73 #ifdef __STDC__
     74 STATIC void options(int);
     75 STATIC void setoption(int, int);
     76 STATIC void minus_o(char *, int);
     77 #else
     78 STATIC void options();
     79 STATIC void setoption();
     80 STATIC void minus_o();
     81 #endif
     82 
     83 
     84 
     85 /*
     86  * Process the shell command line arguments.
     87  */
     88 
     89 void
     90 procargs(argc, argv)
     91 	int argc;
     92 	char **argv;
     93 {
     94 	int i;
     95 
     96 	argptr = argv;
     97 	if (argc > 0)
     98 		argptr++;
     99 	for (i = 0; i < NOPTS; i++)
    100 		optlist[i].val = 2;
    101 	options(1);
    102 	if (*argptr == NULL && minusc == NULL)
    103 		sflag = 1;
    104 	if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
    105 		iflag = 1;
    106 	if (mflag == 2)
    107 		mflag = iflag;
    108 	for (i = 0; i < NOPTS; i++)
    109 		if (optlist[i].val == 2)
    110 			optlist[i].val = 0;
    111 	arg0 = argv[0];
    112 	if (sflag == 0 && minusc == NULL) {
    113 		commandname = arg0 = *argptr++;
    114 		setinputfile(commandname, 0);
    115 	}
    116 	shellparam.p = argptr;
    117 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    118 	while (*argptr) {
    119 		shellparam.nparam++;
    120 		argptr++;
    121 	}
    122 	optschanged();
    123 }
    124 
    125 
    126 void
    127 optschanged()
    128 {
    129 	setinteractive(iflag);
    130 #ifndef NO_HISTORY
    131 	histedit();
    132 #endif
    133 	setjobctl(mflag);
    134 }
    135 
    136 /*
    137  * Process shell options.  The global variable argptr contains a pointer
    138  * to the argument list; we advance it past the options.
    139  */
    140 
    141 STATIC void
    142 options(cmdline)
    143 	int cmdline;
    144 {
    145 	register char *p;
    146 	int val;
    147 	int c;
    148 
    149 	if (cmdline)
    150 		minusc = NULL;
    151 	while ((p = *argptr) != NULL) {
    152 		argptr++;
    153 		if ((c = *p++) == '-') {
    154 			val = 1;
    155                         if (p[0] == '\0' || p[0] == '-' && p[1] == '\0') {
    156                                 if (!cmdline) {
    157                                         /* "-" means turn off -x and -v */
    158                                         if (p[0] == '\0')
    159                                                 xflag = vflag = 0;
    160                                         /* "--" means reset params */
    161                                         else if (*argptr == NULL)
    162 						setparam(argptr);
    163                                 }
    164 				break;	  /* "-" or  "--" terminates options */
    165 			}
    166 		} else if (c == '+') {
    167 			val = 0;
    168 		} else {
    169 			argptr--;
    170 			break;
    171 		}
    172 		while ((c = *p++) != '\0') {
    173 			if (c == 'c' && cmdline) {
    174 				char *q;
    175 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    176 				if (*p == '\0')
    177 #endif
    178 					q = *argptr++;
    179 				if (q == NULL || minusc != NULL)
    180 					error("Bad -c option");
    181 				minusc = q;
    182 #ifdef NOHACK
    183 				break;
    184 #endif
    185 			} else if (c == 'o') {
    186 				minus_o(*argptr, val);
    187 				if (*argptr)
    188 					argptr++;
    189 			} else {
    190 				setoption(c, val);
    191 			}
    192 		}
    193 	}
    194 }
    195 
    196 STATIC void
    197 minus_o(name, val)
    198 	char *name;
    199 	int val;
    200 {
    201 	int i;
    202 
    203 	if (name == NULL) {
    204 		out1str("Current option settings\n");
    205 		for (i = 0; i < NOPTS; i++)
    206 			out1fmt("%-16s%s\n", optlist[i].name,
    207 				optlist[i].val ? "on" : "off");
    208 	} else {
    209 		for (i = 0; i < NOPTS; i++)
    210 			if (equal(name, optlist[i].name)) {
    211 				setoption(optlist[i].letter, val);
    212 				return;
    213 			}
    214 		error("Illegal option -o %s", name);
    215 	}
    216 }
    217 
    218 
    219 STATIC void
    220 setoption(flag, val)
    221 	char flag;
    222 	int val;
    223 	{
    224 	int i;
    225 
    226 	for (i = 0; i < NOPTS; i++)
    227 		if (optlist[i].letter == flag) {
    228 			optlist[i].val = val;
    229 			if (val) {
    230 				/* #%$ hack for ksh semantics */
    231 				if (flag == 'V')
    232 					Eflag = 0;
    233 				else if (flag == 'E')
    234 					Vflag = 0;
    235 			}
    236 			return;
    237 		}
    238 	error("Illegal option -%c", flag);
    239 }
    240 
    241 
    242 
    243 #ifdef mkinit
    244 INCLUDE "options.h"
    245 INCLUDE "extern.h"
    246 
    247 SHELLPROC {
    248 	int i;
    249 
    250 	for (i = 0; i < NOPTS; i++)
    251 		optlist[i].val = 0;
    252 	optschanged();
    253 
    254 }
    255 #endif
    256 
    257 
    258 /*
    259  * Set the shell parameters.
    260  */
    261 
    262 void
    263 setparam(argv)
    264 	char **argv;
    265 	{
    266 	char **newparam;
    267 	char **ap;
    268 	int nparam;
    269 
    270 	for (nparam = 0 ; argv[nparam] ; nparam++);
    271 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    272 	while (*argv) {
    273 		*ap++ = savestr(*argv++);
    274 	}
    275 	*ap = NULL;
    276 	freeparam(&shellparam);
    277 	shellparam.malloc = 1;
    278 	shellparam.nparam = nparam;
    279 	shellparam.p = newparam;
    280 	shellparam.optnext = NULL;
    281 }
    282 
    283 
    284 /*
    285  * Free the list of positional parameters.
    286  */
    287 
    288 void
    289 freeparam(param)
    290 	struct shparam *param;
    291 	{
    292 	char **ap;
    293 
    294 	if (param->malloc) {
    295 		for (ap = param->p ; *ap ; ap++)
    296 			ckfree(*ap);
    297 		ckfree(param->p);
    298 	}
    299 }
    300 
    301 
    302 
    303 /*
    304  * The shift builtin command.
    305  */
    306 
    307 int
    308 shiftcmd(argc, argv)
    309 	int argc;
    310 	char **argv;
    311 {
    312 	int n;
    313 	char **ap1, **ap2;
    314 
    315 	n = 1;
    316 	if (argc > 1)
    317 		n = number(argv[1]);
    318 	if (n > shellparam.nparam)
    319 		error("can't shift that many");
    320 	INTOFF;
    321 	shellparam.nparam -= n;
    322 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    323 		if (shellparam.malloc)
    324 			ckfree(*ap1);
    325 	}
    326 	ap2 = shellparam.p;
    327 	while ((*ap2++ = *ap1++) != NULL);
    328 	shellparam.optnext = NULL;
    329 	INTON;
    330 	return 0;
    331 }
    332 
    333 
    334 
    335 /*
    336  * The set command builtin.
    337  */
    338 
    339 int
    340 setcmd(argc, argv)
    341 	int argc;
    342 	char **argv;
    343 {
    344 	if (argc == 1)
    345 		return showvarscmd(argc, argv);
    346 	INTOFF;
    347 	options(0);
    348 	optschanged();
    349 	if (*argptr != NULL) {
    350 		setparam(argptr);
    351 	}
    352 	INTON;
    353 	return 0;
    354 }
    355 
    356 
    357 /*
    358  * The getopts builtin.  Shellparam.optnext points to the next argument
    359  * to be processed.  Shellparam.optptr points to the next character to
    360  * be processed in the current argument.  If shellparam.optnext is NULL,
    361  * then it's the first time getopts has been called.
    362  */
    363 
    364 int
    365 getoptscmd(argc, argv)
    366 	int argc;
    367 	char **argv;
    368 {
    369 	register char *p, *q;
    370 	char c;
    371 	char s[10];
    372 
    373 	if (argc != 3)
    374 		error("Usage: getopts optstring var");
    375 	if (shellparam.optnext == NULL) {
    376 		shellparam.optnext = shellparam.p;
    377 		shellparam.optptr = NULL;
    378 	}
    379 	if ((p = shellparam.optptr) == NULL || *p == '\0') {
    380 		p = *shellparam.optnext;
    381 		if (p == NULL || *p != '-' || *++p == '\0') {
    382 atend:
    383 			fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
    384 			setvar("OPTIND", s, 0);
    385 			shellparam.optnext = NULL;
    386 			return 1;
    387 		}
    388 		shellparam.optnext++;
    389 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    390 			goto atend;
    391 	}
    392 	c = *p++;
    393 	for (q = argv[1] ; *q != c ; ) {
    394 		if (*q == '\0') {
    395 			out1fmt("Illegal option -%c\n", c);
    396 			c = '?';
    397 			goto out;
    398 		}
    399 		if (*++q == ':')
    400 			q++;
    401 	}
    402 	if (*++q == ':') {
    403 		if (*p == '\0' && (p = *shellparam.optnext) == NULL) {
    404 			out1fmt("No arg for -%c option\n", c);
    405 			c = '?';
    406 			goto out;
    407 		}
    408 		shellparam.optnext++;
    409 		setvar("OPTARG", p, 0);
    410 		p = NULL;
    411 	}
    412 out:
    413 	shellparam.optptr = p;
    414 	s[0] = c;
    415 	s[1] = '\0';
    416 	setvar(argv[2], s, 0);
    417 	return 0;
    418 }
    419 
    420 /*
    421  * XXX - should get rid of.  have all builtins use getopt(3).  the
    422  * library getopt must have the BSD extension static variable "optreset"
    423  * otherwise it can't be used within the shell safely.
    424  *
    425  * Standard option processing (a la getopt) for builtin routines.  The
    426  * only argument that is passed to nextopt is the option string; the
    427  * other arguments are unnecessary.  It return the character, or '\0' on
    428  * end of input.
    429  */
    430 
    431 int
    432 nextopt(optstring)
    433 	char *optstring;
    434 	{
    435 	register char *p, *q;
    436 	char c;
    437 
    438 	if ((p = optptr) == NULL || *p == '\0') {
    439 		p = *argptr;
    440 		if (p == NULL || *p != '-' || *++p == '\0')
    441 			return '\0';
    442 		argptr++;
    443 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    444 			return '\0';
    445 	}
    446 	c = *p++;
    447 	for (q = optstring ; *q != c ; ) {
    448 		if (*q == '\0')
    449 			error("Illegal option -%c", c);
    450 		if (*++q == ':')
    451 			q++;
    452 	}
    453 	if (*++q == ':') {
    454 		if (*p == '\0' && (p = *argptr++) == NULL)
    455 			error("No arg for -%c option", c);
    456 		optarg = p;
    457 		p = NULL;
    458 	}
    459 	optptr = p;
    460 	return c;
    461 }
    462