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options.c revision 1.8 
      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 1.8 1994/06/11 16:12:23 mycroft 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 <unistd.h>
     57 
     58 char *arg0;			/* value of $0 */
     59 struct shparam shellparam;	/* current positional parameters */
     60 char **argptr;			/* argument list for builtin commands */
     61 char *optarg;			/* set by nextopt (like getopt) */
     62 char *optptr;			/* used by nextopt */
     63 
     64 char *minusc;			/* argument to -c option */
     65 
     66 
     67 #ifdef __STDC__
     68 STATIC void options(int);
     69 STATIC void setoption(int, int);
     70 STATIC void minus_o(char *, int);
     71 #else
     72 STATIC void options();
     73 STATIC void setoption();
     74 STATIC void minus_o();
     75 #endif
     76 
     77 
     78 
     79 /*
     80  * Process the shell command line arguments.
     81  */
     82 
     83 void
     84 procargs(argc, argv)
     85 	char **argv;
     86 	{
     87 	int i;
     88 
     89 	argptr = argv;
     90 	if (argc > 0)
     91 		argptr++;
     92 	for (i = 0; i < NOPTS; i++)
     93 		optlist[i].val = 2;
     94 	options(1);
     95 	if (*argptr == NULL && minusc == NULL)
     96 		sflag = 1;
     97 	if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
     98 		iflag = 1;
     99 	if (mflag == 2)
    100 		mflag = iflag;
    101 	for (i = 0; i < NOPTS; i++)
    102 		if (optlist[i].val == 2)
    103 			optlist[i].val = 0;
    104 	arg0 = argv[0];
    105 	if (sflag == 0 && minusc == NULL) {
    106 		commandname = arg0 = *argptr++;
    107 		setinputfile(commandname, 0);
    108 	}
    109 	shellparam.p = argptr;
    110 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    111 	while (*argptr) {
    112 		shellparam.nparam++;
    113 		argptr++;
    114 	}
    115 	optschanged();
    116 }
    117 
    118 
    119 optschanged() {
    120 	setinteractive(iflag);
    121 #ifndef NO_HISTORY
    122 	histedit();
    123 #endif
    124 	setjobctl(mflag);
    125 }
    126 
    127 /*
    128  * Process shell options.  The global variable argptr contains a pointer
    129  * to the argument list; we advance it past the options.
    130  */
    131 
    132 STATIC void
    133 options(cmdline) {
    134 	register char *p;
    135 	int val;
    136 	int c;
    137 
    138 	if (cmdline)
    139 		minusc = NULL;
    140 	while ((p = *argptr) != NULL) {
    141 		argptr++;
    142 		if ((c = *p++) == '-') {
    143 			val = 1;
    144                         if (p[0] == '\0' || p[0] == '-' && p[1] == '\0') {
    145                                 if (!cmdline) {
    146                                         /* "-" means turn off -x and -v */
    147                                         if (p[0] == '\0')
    148                                                 xflag = vflag = 0;
    149                                         /* "--" means reset params */
    150                                         else if (*argptr == NULL)
    151                                                 setparam(argptr);
    152                                 }
    153 				break;	  /* "-" or  "--" terminates options */
    154 			}
    155 		} else if (c == '+') {
    156 			val = 0;
    157 		} else {
    158 			argptr--;
    159 			break;
    160 		}
    161 		while ((c = *p++) != '\0') {
    162 			if (c == 'c' && cmdline) {
    163 				char *q;
    164 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    165 				if (*p == '\0')
    166 #endif
    167 					q = *argptr++;
    168 				if (q == NULL || minusc != NULL)
    169 					error("Bad -c option");
    170 				minusc = q;
    171 #ifdef NOHACK
    172 				break;
    173 #endif
    174 			} else if (c == 'o') {
    175 				minus_o(*argptr, val);
    176 				if (*argptr)
    177 					argptr++;
    178 			} else {
    179 				setoption(c, val);
    180 			}
    181 		}
    182 	}
    183 }
    184 
    185 STATIC void
    186 minus_o(name, val)
    187 	char *name;
    188 	int val;
    189 {
    190 	int i;
    191 
    192 	if (name == NULL) {
    193 		out1str("Current option settings\n");
    194 		for (i = 0; i < NOPTS; i++)
    195 			out1fmt("%-16s%s\n", optlist[i].name,
    196 				optlist[i].val ? "on" : "off");
    197 	} else {
    198 		for (i = 0; i < NOPTS; i++)
    199 			if (equal(name, optlist[i].name)) {
    200 				setoption(optlist[i].letter, val);
    201 				return;
    202 			}
    203 		error("Illegal option -o %s", name);
    204 	}
    205 }
    206 
    207 
    208 STATIC void
    209 setoption(flag, val)
    210 	char flag;
    211 	int val;
    212 	{
    213 	int i;
    214 
    215 	for (i = 0; i < NOPTS; i++)
    216 		if (optlist[i].letter == flag) {
    217 			optlist[i].val = val;
    218 			if (val) {
    219 				/* #%$ hack for ksh semantics */
    220 				if (flag == 'V')
    221 					Eflag = 0;
    222 				else if (flag == 'E')
    223 					Vflag = 0;
    224 			}
    225 			return;
    226 		}
    227 	error("Illegal option -%c", flag);
    228 }
    229 
    230 
    231 
    232 #ifdef mkinit
    233 INCLUDE "options.h"
    234 
    235 SHELLPROC {
    236 	int i;
    237 
    238 	for (i = 0; i < NOPTS; i++)
    239 		optlist[i].val = 0;
    240 	optschanged();
    241 
    242 }
    243 #endif
    244 
    245 
    246 /*
    247  * Set the shell parameters.
    248  */
    249 
    250 void
    251 setparam(argv)
    252 	char **argv;
    253 	{
    254 	char **newparam;
    255 	char **ap;
    256 	int nparam;
    257 
    258 	for (nparam = 0 ; argv[nparam] ; nparam++);
    259 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    260 	while (*argv) {
    261 		*ap++ = savestr(*argv++);
    262 	}
    263 	*ap = NULL;
    264 	freeparam(&shellparam);
    265 	shellparam.malloc = 1;
    266 	shellparam.nparam = nparam;
    267 	shellparam.p = newparam;
    268 	shellparam.optnext = NULL;
    269 }
    270 
    271 
    272 /*
    273  * Free the list of positional parameters.
    274  */
    275 
    276 void
    277 freeparam(param)
    278 	struct shparam *param;
    279 	{
    280 	char **ap;
    281 
    282 	if (param->malloc) {
    283 		for (ap = param->p ; *ap ; ap++)
    284 			ckfree(*ap);
    285 		ckfree(param->p);
    286 	}
    287 }
    288 
    289 
    290 
    291 /*
    292  * The shift builtin command.
    293  */
    294 
    295 shiftcmd(argc, argv)  char **argv; {
    296 	int n;
    297 	char **ap1, **ap2;
    298 
    299 	n = 1;
    300 	if (argc > 1)
    301 		n = number(argv[1]);
    302 	if (n > shellparam.nparam)
    303 		error("can't shift that many");
    304 	INTOFF;
    305 	shellparam.nparam -= n;
    306 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    307 		if (shellparam.malloc)
    308 			ckfree(*ap1);
    309 	}
    310 	ap2 = shellparam.p;
    311 	while ((*ap2++ = *ap1++) != NULL);
    312 	shellparam.optnext = NULL;
    313 	INTON;
    314 	return 0;
    315 }
    316 
    317 
    318 
    319 /*
    320  * The set command builtin.
    321  */
    322 
    323 setcmd(argc, argv)  char **argv; {
    324 	if (argc == 1)
    325 		return showvarscmd(argc, argv);
    326 	INTOFF;
    327 	options(0);
    328 	optschanged();
    329 	if (*argptr != NULL) {
    330 		setparam(argptr);
    331 	}
    332 	INTON;
    333 	return 0;
    334 }
    335 
    336 
    337 /*
    338  * The getopts builtin.  Shellparam.optnext points to the next argument
    339  * to be processed.  Shellparam.optptr points to the next character to
    340  * be processed in the current argument.  If shellparam.optnext is NULL,
    341  * then it's the first time getopts has been called.
    342  */
    343 
    344 getoptscmd(argc, argv)  char **argv; {
    345 	register char *p, *q;
    346 	char c;
    347 	char s[10];
    348 
    349 	if (argc != 3)
    350 		error("Usage: getopts optstring var");
    351 	if (shellparam.optnext == NULL) {
    352 		shellparam.optnext = shellparam.p;
    353 		shellparam.optptr = NULL;
    354 	}
    355 	if ((p = shellparam.optptr) == NULL || *p == '\0') {
    356 		p = *shellparam.optnext;
    357 		if (p == NULL || *p != '-' || *++p == '\0') {
    358 atend:
    359 			fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
    360 			setvar("OPTIND", s, 0);
    361 			shellparam.optnext = NULL;
    362 			return 1;
    363 		}
    364 		shellparam.optnext++;
    365 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    366 			goto atend;
    367 	}
    368 	c = *p++;
    369 	for (q = argv[1] ; *q != c ; ) {
    370 		if (*q == '\0') {
    371 			out1fmt("Illegal option -%c\n", c);
    372 			c = '?';
    373 			goto out;
    374 		}
    375 		if (*++q == ':')
    376 			q++;
    377 	}
    378 	if (*++q == ':') {
    379 		if (*p == '\0' && (p = *shellparam.optnext) == NULL) {
    380 			out1fmt("No arg for -%c option\n", c);
    381 			c = '?';
    382 			goto out;
    383 		}
    384 		shellparam.optnext++;
    385 		setvar("OPTARG", p, 0);
    386 		p = NULL;
    387 	}
    388 out:
    389 	shellparam.optptr = p;
    390 	s[0] = c;
    391 	s[1] = '\0';
    392 	setvar(argv[2], s, 0);
    393 	return 0;
    394 }
    395 
    396 /*
    397  * XXX - should get rid of.  have all builtins use getopt(3).  the
    398  * library getopt must have the BSD extension static variable "optreset"
    399  * otherwise it can't be used within the shell safely.
    400  *
    401  * Standard option processing (a la getopt) for builtin routines.  The
    402  * only argument that is passed to nextopt is the option string; the
    403  * other arguments are unnecessary.  It return the character, or '\0' on
    404  * end of input.
    405  */
    406 
    407 int
    408 nextopt(optstring)
    409 	char *optstring;
    410 	{
    411 	register char *p, *q;
    412 	char c;
    413 
    414 	if ((p = optptr) == NULL || *p == '\0') {
    415 		p = *argptr;
    416 		if (p == NULL || *p != '-' || *++p == '\0')
    417 			return '\0';
    418 		argptr++;
    419 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    420 			return '\0';
    421 	}
    422 	c = *p++;
    423 	for (q = optstring ; *q != c ; ) {
    424 		if (*q == '\0')
    425 			error("Illegal option -%c", c);
    426 		if (*++q == ':')
    427 			q++;
    428 	}
    429 	if (*++q == ':') {
    430 		if (*p == '\0' && (p = *argptr++) == NULL)
    431 			error("No arg for -%c option", c);
    432 		optarg = p;
    433 		p = NULL;
    434 	}
    435 	optptr = p;
    436 	return c;
    437 }
    438