Home | History | Annotate | Line # | Download | only in sh
options.c revision 1.4 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * 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	5.2 (Berkeley) 3/13/91";*/
     39 static char rcsid[] = "$Id: options.c,v 1.4 1993/08/01 18:58:04 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 
     57 char *arg0;			/* value of $0 */
     58 struct shparam shellparam;	/* current positional parameters */
     59 char **argptr;			/* argument list for builtin commands */
     60 char *optarg;			/* set by nextopt (like getopt) */
     61 char *optptr;			/* used by nextopt */
     62 
     63 char *minusc;			/* argument to -c option */
     64 
     65 
     66 #ifdef __STDC__
     67 STATIC void options(int);
     68 STATIC void setoption(int, int);
     69 #else
     70 STATIC void options();
     71 STATIC void setoption();
     72 #endif
     73 
     74 
     75 
     76 /*
     77  * Process the shell command line arguments.
     78  */
     79 
     80 void
     81 procargs(argc, argv)
     82 	char **argv;
     83 	{
     84 	char *p;
     85 
     86 	argptr = argv;
     87 	if (argc > 0)
     88 		argptr++;
     89 	for (p = optval ; p < optval + sizeof optval - 1 ; p++)
     90 		*p = 2;
     91 	options(1);
     92 	if (*argptr == NULL && minusc == NULL)
     93 		sflag = 1;
     94 	if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
     95 		iflag = 1;
     96 	if (jflag == 2)
     97 		jflag = iflag;
     98 	for (p = optval ; p < optval + sizeof optval - 1 ; p++)
     99 		if (*p == 2)
    100 			*p = 0;
    101 	arg0 = argv[0];
    102 	if (sflag == 0 && minusc == NULL) {
    103 		commandname = arg0 = *argptr++;
    104 		setinputfile(commandname, 0);
    105 	}
    106 	shellparam.p = argptr;
    107 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    108 	while (*argptr) {
    109 		shellparam.nparam++;
    110 		argptr++;
    111 	}
    112 	setinteractive(iflag);
    113 	setjobctl(jflag);
    114 }
    115 
    116 
    117 
    118 /*
    119  * Process shell options.  The global variable argptr contains a pointer
    120  * to the argument list; we advance it past the options.
    121  */
    122 
    123 STATIC void
    124 options(cmdline) {
    125 	register char *p;
    126 	int val;
    127 	int c;
    128 
    129 	if (cmdline)
    130 		minusc = NULL;
    131 	while ((p = *argptr) != NULL) {
    132 		argptr++;
    133 		if ((c = *p++) == '-') {
    134 			val = 1;
    135                         if (p[0] == '\0' || p[0] == '-' && p[1] == '\0') {
    136                                 if (!cmdline) {
    137                                         /* "-" means turn off -x and -v */
    138                                         if (p[0] == '\0')
    139                                                 xflag = vflag = 0;
    140                                         /* "--" means reset params */
    141                                         else if (*argptr == NULL)
    142                                                 setparam(argptr);
    143                                 }
    144 				break;	  /* "-" or  "--" terminates options */
    145 			}
    146 		} else if (c == '+') {
    147 			val = 0;
    148 		} else {
    149 			argptr--;
    150 			break;
    151 		}
    152 		while ((c = *p++) != '\0') {
    153 			if (c == 'c' && cmdline) {
    154 				char *q;
    155 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    156 				if (*p == '\0')
    157 #endif
    158 					q = *argptr++;
    159 				if (q == NULL || minusc != NULL)
    160 					error("Bad -c option");
    161 				minusc = q;
    162 #ifdef NOHACK
    163 				break;
    164 #endif
    165 			} else {
    166 				setoption(c, val);
    167 			}
    168 		}
    169 		if (! cmdline)
    170 			break;
    171 	}
    172 }
    173 
    174 
    175 STATIC void
    176 setoption(flag, val)
    177 	char flag;
    178 	int val;
    179 	{
    180 	register char *p;
    181 
    182 	if ((p = strchr(optchar, flag)) == NULL)
    183 		error("Illegal option -%c", flag);
    184 	optval[p - optchar] = val;
    185 }
    186 
    187 
    188 
    189 #ifdef mkinit
    190 INCLUDE "options.h"
    191 
    192 SHELLPROC {
    193 	char *p;
    194 
    195 	for (p = optval ; p < optval + sizeof optval ; p++)
    196 		*p = 0;
    197 }
    198 #endif
    199 
    200 
    201 /*
    202  * Set the shell parameters.
    203  */
    204 
    205 void
    206 setparam(argv)
    207 	char **argv;
    208 	{
    209 	char **newparam;
    210 	char **ap;
    211 	int nparam;
    212 
    213 	for (nparam = 0 ; argv[nparam] ; nparam++);
    214 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    215 	while (*argv) {
    216 		*ap++ = savestr(*argv++);
    217 	}
    218 	*ap = NULL;
    219 	freeparam(&shellparam);
    220 	shellparam.malloc = 1;
    221 	shellparam.nparam = nparam;
    222 	shellparam.p = newparam;
    223 	shellparam.optnext = NULL;
    224 }
    225 
    226 
    227 /*
    228  * Free the list of positional parameters.
    229  */
    230 
    231 void
    232 freeparam(param)
    233 	struct shparam *param;
    234 	{
    235 	char **ap;
    236 
    237 	if (param->malloc) {
    238 		for (ap = param->p ; *ap ; ap++)
    239 			ckfree(*ap);
    240 		ckfree(param->p);
    241 	}
    242 }
    243 
    244 
    245 
    246 /*
    247  * The shift builtin command.
    248  */
    249 
    250 shiftcmd(argc, argv)  char **argv; {
    251 	int n;
    252 	char **ap1, **ap2;
    253 
    254 	n = 1;
    255 	if (argc > 1)
    256 		n = number(argv[1]);
    257 	if (n > shellparam.nparam)
    258 		n = shellparam.nparam;
    259 	INTOFF;
    260 	shellparam.nparam -= n;
    261 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    262 		if (shellparam.malloc)
    263 			ckfree(*ap1);
    264 	}
    265 	ap2 = shellparam.p;
    266 	while ((*ap2++ = *ap1++) != NULL);
    267 	shellparam.optnext = NULL;
    268 	INTON;
    269 	return 0;
    270 }
    271 
    272 
    273 
    274 /*
    275  * The set command builtin.
    276  */
    277 
    278 setcmd(argc, argv)  char **argv; {
    279 	if (argc == 1)
    280 		return showvarscmd(argc, argv);
    281 	INTOFF;
    282 	options(0);
    283 	setinteractive(iflag);
    284 	setjobctl(jflag);
    285 	if (*argptr != NULL) {
    286 		setparam(argptr);
    287 	}
    288 	INTON;
    289 	return 0;
    290 }
    291 
    292 
    293 /*
    294  * The getopts builtin.  Shellparam.optnext points to the next argument
    295  * to be processed.  Shellparam.optptr points to the next character to
    296  * be processed in the current argument.  If shellparam.optnext is NULL,
    297  * then it's the first time getopts has been called.
    298  */
    299 
    300 getoptscmd(argc, argv)  char **argv; {
    301 	register char *p, *q;
    302 	char c;
    303 	char s[10];
    304 
    305 	if (argc != 3)
    306 		error("Usage: getopts optstring var");
    307 	if (shellparam.optnext == NULL) {
    308 		shellparam.optnext = shellparam.p;
    309 		shellparam.optptr = NULL;
    310 	}
    311 	if ((p = shellparam.optptr) == NULL || *p == '\0') {
    312 		p = *shellparam.optnext;
    313 		if (p == NULL || *p != '-' || *++p == '\0') {
    314 atend:
    315 			fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
    316 			setvar("OPTIND", s, 0);
    317 			shellparam.optnext = NULL;
    318 			return 1;
    319 		}
    320 		shellparam.optnext++;
    321 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    322 			goto atend;
    323 	}
    324 	c = *p++;
    325 	for (q = argv[1] ; *q != c ; ) {
    326 		if (*q == '\0') {
    327 			out1fmt("Illegal option -%c\n", c);
    328 			c = '?';
    329 			goto out;
    330 		}
    331 		if (*++q == ':')
    332 			q++;
    333 	}
    334 	if (*++q == ':') {
    335 		if (*p == '\0' && (p = *shellparam.optnext) == NULL) {
    336 			out1fmt("No arg for -%c option\n", c);
    337 			c = '?';
    338 			goto out;
    339 		}
    340 		shellparam.optnext++;
    341 		setvar("OPTARG", p, 0);
    342 		p = NULL;
    343 	}
    344 out:
    345 	shellparam.optptr = p;
    346 	s[0] = c;
    347 	s[1] = '\0';
    348 	setvar(argv[2], s, 0);
    349 	return 0;
    350 }
    351 
    352 /*
    353  * Standard option processing (a la getopt) for builtin routines.  The
    354  * only argument that is passed to nextopt is the option string; the
    355  * other arguments are unnecessary.  It return the character, or '\0' on
    356  * end of input.
    357  */
    358 
    359 int
    360 nextopt(optstring)
    361 	char *optstring;
    362 	{
    363 	register char *p, *q;
    364 	char c;
    365 
    366 	if ((p = optptr) == NULL || *p == '\0') {
    367 		p = *argptr;
    368 		if (p == NULL || *p != '-' || *++p == '\0')
    369 			return '\0';
    370 		argptr++;
    371 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    372 			return '\0';
    373 	}
    374 	c = *p++;
    375 	for (q = optstring ; *q != c ; ) {
    376 		if (*q == '\0')
    377 			error("Illegal option -%c", c);
    378 		if (*++q == ':')
    379 			q++;
    380 	}
    381 	if (*++q == ':') {
    382 		if (*p == '\0' && (p = *argptr++) == NULL)
    383 			error("No arg for -%c option", c);
    384 		optarg = p;
    385 		p = NULL;
    386 	}
    387 	optptr = p;
    388 	return c;
    389 }
    390