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options.c revision 1.1 
      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[] = "@(#)options.c	5.2 (Berkeley) 3/13/91";
     39 #endif /* not lint */
     40 
     41 #include "shell.h"
     42 #define DEFINE_OPTIONS
     43 #include "options.h"
     44 #undef DEFINE_OPTIONS
     45 #include "nodes.h"	/* for other header files */
     46 #include "eval.h"
     47 #include "jobs.h"
     48 #include "input.h"
     49 #include "output.h"
     50 #include "trap.h"
     51 #include "var.h"
     52 #include "memalloc.h"
     53 #include "error.h"
     54 #include "mystring.h"
     55 
     56 char *arg0;			/* value of $0 */
     57 struct shparam shellparam;	/* current positional parameters */
     58 char **argptr;			/* argument list for builtin commands */
     59 char *optarg;			/* set by nextopt (like getopt) */
     60 char *optptr;			/* used by nextopt */
     61 
     62 char *minusc;			/* argument to -c option */
     63 
     64 
     65 #ifdef __STDC__
     66 STATIC void options(int);
     67 STATIC void setoption(int, int);
     68 #else
     69 STATIC void options();
     70 STATIC void setoption();
     71 #endif
     72 
     73 
     74 
     75 /*
     76  * Process the shell command line arguments.
     77  */
     78 
     79 void
     80 procargs(argc, argv)
     81 	char **argv;
     82 	{
     83 	char *p;
     84 
     85 	argptr = argv;
     86 	if (argc > 0)
     87 		argptr++;
     88 	for (p = optval ; p < optval + sizeof optval - 1 ; p++)
     89 		*p = 2;
     90 	options(1);
     91 	if (*argptr == NULL && minusc == NULL)
     92 		sflag = 1;
     93 	if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
     94 		iflag = 1;
     95 	if (jflag == 2)
     96 		jflag = iflag;
     97 	for (p = optval ; p < optval + sizeof optval - 1 ; p++)
     98 		if (*p == 2)
     99 			*p = 0;
    100 	arg0 = argv[0];
    101 	if (sflag == 0 && minusc == NULL) {
    102 		commandname = arg0 = *argptr++;
    103 		setinputfile(commandname, 0);
    104 	}
    105 	shellparam.p = argptr;
    106 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    107 	while (*argptr) {
    108 		shellparam.nparam++;
    109 		argptr++;
    110 	}
    111 	setinteractive(iflag);
    112 	setjobctl(jflag);
    113 }
    114 
    115 
    116 
    117 /*
    118  * Process shell options.  The global variable argptr contains a pointer
    119  * to the argument list; we advance it past the options.
    120  */
    121 
    122 STATIC void
    123 options(cmdline) {
    124 	register char *p;
    125 	int val;
    126 	int c;
    127 
    128 	if (cmdline)
    129 		minusc = NULL;
    130 	while ((p = *argptr) != NULL) {
    131 		argptr++;
    132 		if ((c = *p++) == '-') {
    133 			val = 1;
    134                         if (p[0] == '\0' || p[0] == '-' && p[1] == '\0') {
    135                                 if (!cmdline) {
    136                                         /* "-" means turn off -x and -v */
    137                                         if (p[0] == '\0')
    138                                                 xflag = vflag = 0;
    139                                         /* "--" means reset params */
    140                                         else if (*argptr == NULL)
    141                                                 setparam(argptr);
    142                                 }
    143 				break;	  /* "-" or  "--" terminates options */
    144 			}
    145 		} else if (c == '+') {
    146 			val = 0;
    147 		} else {
    148 			argptr--;
    149 			break;
    150 		}
    151 		while ((c = *p++) != '\0') {
    152 			if (c == 'c' && cmdline) {
    153 				char *q;
    154 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    155 				if (*p == '\0')
    156 #endif
    157 					q = *argptr++;
    158 				if (q == NULL || minusc != NULL)
    159 					error("Bad -c option");
    160 				minusc = q;
    161 #ifdef NOHACK
    162 				break;
    163 #endif
    164 			} else {
    165 				setoption(c, val);
    166 			}
    167 		}
    168 		if (! cmdline)
    169 			break;
    170 	}
    171 }
    172 
    173 
    174 STATIC void
    175 setoption(flag, val)
    176 	char flag;
    177 	int val;
    178 	{
    179 	register char *p;
    180 
    181 	if ((p = strchr(optchar, flag)) == NULL)
    182 		error("Illegal option -%c", flag);
    183 	optval[p - optchar] = val;
    184 }
    185 
    186 
    187 
    188 #ifdef mkinit
    189 INCLUDE "options.h"
    190 
    191 SHELLPROC {
    192 	char *p;
    193 
    194 	for (p = optval ; p < optval + sizeof optval ; p++)
    195 		*p = 0;
    196 }
    197 #endif
    198 
    199 
    200 /*
    201  * Set the shell parameters.
    202  */
    203 
    204 void
    205 setparam(argv)
    206 	char **argv;
    207 	{
    208 	char **newparam;
    209 	char **ap;
    210 	int nparam;
    211 
    212 	for (nparam = 0 ; argv[nparam] ; nparam++);
    213 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    214 	while (*argv) {
    215 		*ap++ = savestr(*argv++);
    216 	}
    217 	*ap = NULL;
    218 	freeparam(&shellparam);
    219 	shellparam.malloc = 1;
    220 	shellparam.nparam = nparam;
    221 	shellparam.p = newparam;
    222 	shellparam.optnext = NULL;
    223 }
    224 
    225 
    226 /*
    227  * Free the list of positional parameters.
    228  */
    229 
    230 void
    231 freeparam(param)
    232 	struct shparam *param;
    233 	{
    234 	char **ap;
    235 
    236 	if (param->malloc) {
    237 		for (ap = param->p ; *ap ; ap++)
    238 			ckfree(*ap);
    239 		ckfree(param->p);
    240 	}
    241 }
    242 
    243 
    244 
    245 /*
    246  * The shift builtin command.
    247  */
    248 
    249 shiftcmd(argc, argv)  char **argv; {
    250 	int n;
    251 	char **ap1, **ap2;
    252 
    253 	n = 1;
    254 	if (argc > 1)
    255 		n = number(argv[1]);
    256 	if (n > shellparam.nparam)
    257 		n = shellparam.nparam;
    258 	INTOFF;
    259 	shellparam.nparam -= n;
    260 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    261 		if (shellparam.malloc)
    262 			ckfree(*ap1);
    263 	}
    264 	ap2 = shellparam.p;
    265 	while ((*ap2++ = *ap1++) != NULL);
    266 	shellparam.optnext = NULL;
    267 	INTON;
    268 	return 0;
    269 }
    270 
    271 
    272 
    273 /*
    274  * The set command builtin.
    275  */
    276 
    277 setcmd(argc, argv)  char **argv; {
    278 	if (argc == 1)
    279 		return showvarscmd(argc, argv);
    280 	INTOFF;
    281 	options(0);
    282 	setinteractive(iflag);
    283 	setjobctl(jflag);
    284 	if (*argptr != NULL) {
    285 		setparam(argptr);
    286 	}
    287 	INTON;
    288 	return 0;
    289 }
    290 
    291 
    292 /*
    293  * The getopts builtin.  Shellparam.optnext points to the next argument
    294  * to be processed.  Shellparam.optptr points to the next character to
    295  * be processed in the current argument.  If shellparam.optnext is NULL,
    296  * then it's the first time getopts has been called.
    297  */
    298 
    299 getoptscmd(argc, argv)  char **argv; {
    300 	register char *p, *q;
    301 	char c;
    302 	char s[10];
    303 
    304 	if (argc != 3)
    305 		error("Usage: getopts optstring var");
    306 	if (shellparam.optnext == NULL) {
    307 		shellparam.optnext = shellparam.p;
    308 		shellparam.optptr = NULL;
    309 	}
    310 	if ((p = shellparam.optptr) == NULL || *p == '\0') {
    311 		p = *shellparam.optnext;
    312 		if (p == NULL || *p != '-' || *++p == '\0') {
    313 atend:
    314 			fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
    315 			setvar("OPTIND", s, 0);
    316 			shellparam.optnext = NULL;
    317 			return 1;
    318 		}
    319 		shellparam.optnext++;
    320 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    321 			goto atend;
    322 	}
    323 	c = *p++;
    324 	for (q = argv[1] ; *q != c ; ) {
    325 		if (*q == '\0') {
    326 			out1fmt("Illegal option -%c\n", c);
    327 			c = '?';
    328 			goto out;
    329 		}
    330 		if (*++q == ':')
    331 			q++;
    332 	}
    333 	if (*++q == ':') {
    334 		if (*p == '\0' && (p = *shellparam.optnext) == NULL) {
    335 			out1fmt("No arg for -%c option\n", c);
    336 			c = '?';
    337 			goto out;
    338 		}
    339 		shellparam.optnext++;
    340 		setvar("OPTARG", p, 0);
    341 		p = NULL;
    342 	}
    343 out:
    344 	shellparam.optptr = p;
    345 	s[0] = c;
    346 	s[1] = '\0';
    347 	setvar(argv[2], s, 0);
    348 	return 0;
    349 }
    350 
    351 /*
    352  * Standard option processing (a la getopt) for builtin routines.  The
    353  * only argument that is passed to nextopt is the option string; the
    354  * other arguments are unnecessary.  It return the character, or '\0' on
    355  * end of input.
    356  */
    357 
    358 int
    359 nextopt(optstring)
    360 	char *optstring;
    361 	{
    362 	register char *p, *q;
    363 	char c;
    364 
    365 	if ((p = optptr) == NULL || *p == '\0') {
    366 		p = *argptr;
    367 		if (p == NULL || *p != '-' || *++p == '\0')
    368 			return '\0';
    369 		argptr++;
    370 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    371 			return '\0';
    372 	}
    373 	c = *p++;
    374 	for (q = optstring ; *q != c ; ) {
    375 		if (*q == '\0')
    376 			error("Illegal option -%c", c);
    377 		if (*++q == ':')
    378 			q++;
    379 	}
    380 	if (*++q == ':') {
    381 		if (*p == '\0' && (p = *argptr++) == NULL)
    382 			error("No arg for -%c option", c);
    383 		optarg = p;
    384 		p = NULL;
    385 	}
    386 	optptr = p;
    387 	return c;
    388 }
    389