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options.c revision 1.10 
      1 /*-
      2  * Copyright (c) 1991, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Kenneth Almquist.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #ifndef lint
     38 /*static char sccsid[] = "from: @(#)options.c	8.1 (Berkeley) 5/31/93";*/
     39 static char *rcsid = "$Id: options.c,v 1.10 1994/12/05 19:07:46 cgd Exp $";
     40 #endif /* not lint */
     41 
     42 #include "shell.h"
     43 #define DEFINE_OPTIONS
     44 #include "options.h"
     45 #undef DEFINE_OPTIONS
     46 #include "nodes.h"	/* for other header files */
     47 #include "eval.h"
     48 #include "jobs.h"
     49 #include "input.h"
     50 #include "output.h"
     51 #include "trap.h"
     52 #include "var.h"
     53 #include "memalloc.h"
     54 #include "error.h"
     55 #include "mystring.h"
     56 #include "extern.h"
     57 #include <unistd.h>
     58 
     59 char *arg0;			/* value of $0 */
     60 struct shparam shellparam;	/* current positional parameters */
     61 char **argptr;			/* argument list for builtin commands */
     62 char *optarg;			/* set by nextopt (like getopt) */
     63 char *optptr;			/* used by nextopt */
     64 
     65 char *minusc;			/* argument to -c option */
     66 
     67 
     68 #ifdef __STDC__
     69 STATIC void options(int);
     70 STATIC void setoption(int, int);
     71 STATIC void minus_o(char *, int);
     72 #else
     73 STATIC void options();
     74 STATIC void setoption();
     75 STATIC void minus_o();
     76 #endif
     77 
     78 
     79 
     80 /*
     81  * Process the shell command line arguments.
     82  */
     83 
     84 void
     85 procargs(argc, argv)
     86 	int argc;
     87 	char **argv;
     88 {
     89 	int i;
     90 
     91 	argptr = argv;
     92 	if (argc > 0)
     93 		argptr++;
     94 	for (i = 0; i < NOPTS; i++)
     95 		optlist[i].val = 2;
     96 	options(1);
     97 	if (*argptr == NULL && minusc == NULL)
     98 		sflag = 1;
     99 	if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
    100 		iflag = 1;
    101 	if (mflag == 2)
    102 		mflag = iflag;
    103 	for (i = 0; i < NOPTS; i++)
    104 		if (optlist[i].val == 2)
    105 			optlist[i].val = 0;
    106 	arg0 = argv[0];
    107 	if (sflag == 0 && minusc == NULL) {
    108 		commandname = arg0 = *argptr++;
    109 		setinputfile(commandname, 0);
    110 	}
    111 	shellparam.p = argptr;
    112 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    113 	while (*argptr) {
    114 		shellparam.nparam++;
    115 		argptr++;
    116 	}
    117 	optschanged();
    118 }
    119 
    120 
    121 void
    122 optschanged()
    123 {
    124 	setinteractive(iflag);
    125 #ifndef NO_HISTORY
    126 	histedit();
    127 #endif
    128 	setjobctl(mflag);
    129 }
    130 
    131 /*
    132  * Process shell options.  The global variable argptr contains a pointer
    133  * to the argument list; we advance it past the options.
    134  */
    135 
    136 STATIC void
    137 options(cmdline)
    138 	int cmdline;
    139 {
    140 	register char *p;
    141 	int val;
    142 	int c;
    143 
    144 	if (cmdline)
    145 		minusc = NULL;
    146 	while ((p = *argptr) != NULL) {
    147 		argptr++;
    148 		if ((c = *p++) == '-') {
    149 			val = 1;
    150                         if (p[0] == '\0' || p[0] == '-' && p[1] == '\0') {
    151                                 if (!cmdline) {
    152                                         /* "-" means turn off -x and -v */
    153                                         if (p[0] == '\0')
    154                                                 xflag = vflag = 0;
    155                                         /* "--" means reset params */
    156                                         else if (*argptr == NULL)
    157                                                 setparam(argptr);
    158                                 }
    159 				break;	  /* "-" or  "--" terminates options */
    160 			}
    161 		} else if (c == '+') {
    162 			val = 0;
    163 		} else {
    164 			argptr--;
    165 			break;
    166 		}
    167 		while ((c = *p++) != '\0') {
    168 			if (c == 'c' && cmdline) {
    169 				char *q;
    170 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    171 				if (*p == '\0')
    172 #endif
    173 					q = *argptr++;
    174 				if (q == NULL || minusc != NULL)
    175 					error("Bad -c option");
    176 				minusc = q;
    177 #ifdef NOHACK
    178 				break;
    179 #endif
    180 			} else if (c == 'o') {
    181 				minus_o(*argptr, val);
    182 				if (*argptr)
    183 					argptr++;
    184 			} else {
    185 				setoption(c, val);
    186 			}
    187 		}
    188 	}
    189 }
    190 
    191 STATIC void
    192 minus_o(name, val)
    193 	char *name;
    194 	int val;
    195 {
    196 	int i;
    197 
    198 	if (name == NULL) {
    199 		out1str("Current option settings\n");
    200 		for (i = 0; i < NOPTS; i++)
    201 			out1fmt("%-16s%s\n", optlist[i].name,
    202 				optlist[i].val ? "on" : "off");
    203 	} else {
    204 		for (i = 0; i < NOPTS; i++)
    205 			if (equal(name, optlist[i].name)) {
    206 				setoption(optlist[i].letter, val);
    207 				return;
    208 			}
    209 		error("Illegal option -o %s", name);
    210 	}
    211 }
    212 
    213 
    214 STATIC void
    215 setoption(flag, val)
    216 	char flag;
    217 	int val;
    218 	{
    219 	int i;
    220 
    221 	for (i = 0; i < NOPTS; i++)
    222 		if (optlist[i].letter == flag) {
    223 			optlist[i].val = val;
    224 			if (val) {
    225 				/* #%$ hack for ksh semantics */
    226 				if (flag == 'V')
    227 					Eflag = 0;
    228 				else if (flag == 'E')
    229 					Vflag = 0;
    230 			}
    231 			return;
    232 		}
    233 	error("Illegal option -%c", flag);
    234 }
    235 
    236 
    237 
    238 #ifdef mkinit
    239 INCLUDE "options.h"
    240 INCLUDE "extern.h"
    241 
    242 SHELLPROC {
    243 	int i;
    244 
    245 	for (i = 0; i < NOPTS; i++)
    246 		optlist[i].val = 0;
    247 	optschanged();
    248 
    249 }
    250 #endif
    251 
    252 
    253 /*
    254  * Set the shell parameters.
    255  */
    256 
    257 void
    258 setparam(argv)
    259 	char **argv;
    260 	{
    261 	char **newparam;
    262 	char **ap;
    263 	int nparam;
    264 
    265 	for (nparam = 0 ; argv[nparam] ; nparam++);
    266 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    267 	while (*argv) {
    268 		*ap++ = savestr(*argv++);
    269 	}
    270 	*ap = NULL;
    271 	freeparam(&shellparam);
    272 	shellparam.malloc = 1;
    273 	shellparam.nparam = nparam;
    274 	shellparam.p = newparam;
    275 	shellparam.optnext = NULL;
    276 }
    277 
    278 
    279 /*
    280  * Free the list of positional parameters.
    281  */
    282 
    283 void
    284 freeparam(param)
    285 	struct shparam *param;
    286 	{
    287 	char **ap;
    288 
    289 	if (param->malloc) {
    290 		for (ap = param->p ; *ap ; ap++)
    291 			ckfree(*ap);
    292 		ckfree(param->p);
    293 	}
    294 }
    295 
    296 
    297 
    298 /*
    299  * The shift builtin command.
    300  */
    301 
    302 int
    303 shiftcmd(argc, argv)
    304 	int argc;
    305 	char **argv;
    306 {
    307 	int n;
    308 	char **ap1, **ap2;
    309 
    310 	n = 1;
    311 	if (argc > 1)
    312 		n = number(argv[1]);
    313 	if (n > shellparam.nparam)
    314 		error("can't shift that many");
    315 	INTOFF;
    316 	shellparam.nparam -= n;
    317 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    318 		if (shellparam.malloc)
    319 			ckfree(*ap1);
    320 	}
    321 	ap2 = shellparam.p;
    322 	while ((*ap2++ = *ap1++) != NULL);
    323 	shellparam.optnext = NULL;
    324 	INTON;
    325 	return 0;
    326 }
    327 
    328 
    329 
    330 /*
    331  * The set command builtin.
    332  */
    333 
    334 int
    335 setcmd(argc, argv)
    336 	int argc;
    337 	char **argv;
    338 {
    339 	if (argc == 1)
    340 		return showvarscmd(argc, argv);
    341 	INTOFF;
    342 	options(0);
    343 	optschanged();
    344 	if (*argptr != NULL) {
    345 		setparam(argptr);
    346 	}
    347 	INTON;
    348 	return 0;
    349 }
    350 
    351 
    352 /*
    353  * The getopts builtin.  Shellparam.optnext points to the next argument
    354  * to be processed.  Shellparam.optptr points to the next character to
    355  * be processed in the current argument.  If shellparam.optnext is NULL,
    356  * then it's the first time getopts has been called.
    357  */
    358 
    359 int
    360 getoptscmd(argc, argv)
    361 	int argc;
    362 	char **argv;
    363 {
    364 	register char *p, *q;
    365 	char c;
    366 	char s[10];
    367 
    368 	if (argc != 3)
    369 		error("Usage: getopts optstring var");
    370 	if (shellparam.optnext == NULL) {
    371 		shellparam.optnext = shellparam.p;
    372 		shellparam.optptr = NULL;
    373 	}
    374 	if ((p = shellparam.optptr) == NULL || *p == '\0') {
    375 		p = *shellparam.optnext;
    376 		if (p == NULL || *p != '-' || *++p == '\0') {
    377 atend:
    378 			fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
    379 			setvar("OPTIND", s, 0);
    380 			shellparam.optnext = NULL;
    381 			return 1;
    382 		}
    383 		shellparam.optnext++;
    384 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    385 			goto atend;
    386 	}
    387 	c = *p++;
    388 	for (q = argv[1] ; *q != c ; ) {
    389 		if (*q == '\0') {
    390 			out1fmt("Illegal option -%c\n", c);
    391 			c = '?';
    392 			goto out;
    393 		}
    394 		if (*++q == ':')
    395 			q++;
    396 	}
    397 	if (*++q == ':') {
    398 		if (*p == '\0' && (p = *shellparam.optnext) == NULL) {
    399 			out1fmt("No arg for -%c option\n", c);
    400 			c = '?';
    401 			goto out;
    402 		}
    403 		shellparam.optnext++;
    404 		setvar("OPTARG", p, 0);
    405 		p = NULL;
    406 	}
    407 out:
    408 	shellparam.optptr = p;
    409 	s[0] = c;
    410 	s[1] = '\0';
    411 	setvar(argv[2], s, 0);
    412 	return 0;
    413 }
    414 
    415 /*
    416  * XXX - should get rid of.  have all builtins use getopt(3).  the
    417  * library getopt must have the BSD extension static variable "optreset"
    418  * otherwise it can't be used within the shell safely.
    419  *
    420  * Standard option processing (a la getopt) for builtin routines.  The
    421  * only argument that is passed to nextopt is the option string; the
    422  * other arguments are unnecessary.  It return the character, or '\0' on
    423  * end of input.
    424  */
    425 
    426 int
    427 nextopt(optstring)
    428 	char *optstring;
    429 	{
    430 	register char *p, *q;
    431 	char c;
    432 
    433 	if ((p = optptr) == NULL || *p == '\0') {
    434 		p = *argptr;
    435 		if (p == NULL || *p != '-' || *++p == '\0')
    436 			return '\0';
    437 		argptr++;
    438 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    439 			return '\0';
    440 	}
    441 	c = *p++;
    442 	for (q = optstring ; *q != c ; ) {
    443 		if (*q == '\0')
    444 			error("Illegal option -%c", c);
    445 		if (*++q == ':')
    446 			q++;
    447 	}
    448 	if (*++q == ':') {
    449 		if (*p == '\0' && (p = *argptr++) == NULL)
    450 			error("No arg for -%c option", c);
    451 		optarg = p;
    452 		p = NULL;
    453 	}
    454 	optptr = p;
    455 	return c;
    456 }
    457