Home | History | Annotate | Line # | Download | only in sh
options.c revision 1.6 
      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[] = "@(#)options.c	8.1 (Berkeley) 5/31/93";
     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 #include <unistd.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 STATIC void minus_o(char *, int);
     70 #else
     71 STATIC void options();
     72 STATIC void setoption();
     73 STATIC void minus_o();
     74 #endif
     75 
     76 
     77 
     78 /*
     79  * Process the shell command line arguments.
     80  */
     81 
     82 void
     83 procargs(argc, argv)
     84 	char **argv;
     85 	{
     86 	int i;
     87 
     88 	argptr = argv;
     89 	if (argc > 0)
     90 		argptr++;
     91 	for (i = 0; i < NOPTS; i++)
     92 		optlist[i].val = 2;
     93 	options(1);
     94 	if (*argptr == NULL && minusc == NULL)
     95 		sflag = 1;
     96 	if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
     97 		iflag = 1;
     98 	if (mflag == 2)
     99 		mflag = iflag;
    100 	for (i = 0; i < NOPTS; i++)
    101 		if (optlist[i].val == 2)
    102 			optlist[i].val = 0;
    103 	arg0 = argv[0];
    104 	if (sflag == 0 && minusc == NULL) {
    105 		commandname = arg0 = *argptr++;
    106 		setinputfile(commandname, 0);
    107 	}
    108 	shellparam.p = argptr;
    109 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    110 	while (*argptr) {
    111 		shellparam.nparam++;
    112 		argptr++;
    113 	}
    114 	optschanged();
    115 }
    116 
    117 
    118 optschanged() {
    119 	setinteractive(iflag);
    120 	histedit();
    121 	setjobctl(mflag);
    122 }
    123 
    124 /*
    125  * Process shell options.  The global variable argptr contains a pointer
    126  * to the argument list; we advance it past the options.
    127  */
    128 
    129 STATIC void
    130 options(cmdline) {
    131 	register char *p;
    132 	int val;
    133 	int c;
    134 
    135 	if (cmdline)
    136 		minusc = NULL;
    137 	while ((p = *argptr) != NULL) {
    138 		argptr++;
    139 		if ((c = *p++) == '-') {
    140 			val = 1;
    141                         if (p[0] == '\0' || p[0] == '-' && p[1] == '\0') {
    142                                 if (!cmdline) {
    143                                         /* "-" means turn off -x and -v */
    144                                         if (p[0] == '\0')
    145                                                 xflag = vflag = 0;
    146                                         /* "--" means reset params */
    147                                         else if (*argptr == NULL)
    148                                                 setparam(argptr);
    149                                 }
    150 				break;	  /* "-" or  "--" terminates options */
    151 			}
    152 		} else if (c == '+') {
    153 			val = 0;
    154 		} else {
    155 			argptr--;
    156 			break;
    157 		}
    158 		while ((c = *p++) != '\0') {
    159 			if (c == 'c' && cmdline) {
    160 				char *q;
    161 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    162 				if (*p == '\0')
    163 #endif
    164 					q = *argptr++;
    165 				if (q == NULL || minusc != NULL)
    166 					error("Bad -c option");
    167 				minusc = q;
    168 #ifdef NOHACK
    169 				break;
    170 #endif
    171 			} else if (c == 'o') {
    172 				minus_o(*argptr, val);
    173 				if (*argptr)
    174 					argptr++;
    175 			} else {
    176 				setoption(c, val);
    177 			}
    178 		}
    179 	}
    180 }
    181 
    182 STATIC void
    183 minus_o(name, val)
    184 	char *name;
    185 	int val;
    186 {
    187 	int i;
    188 
    189 	if (name == NULL) {
    190 		out1str("Current option settings\n");
    191 		for (i = 0; i < NOPTS; i++)
    192 			out1fmt("%-16s%s\n", optlist[i].name,
    193 				optlist[i].val ? "on" : "off");
    194 	} else {
    195 		for (i = 0; i < NOPTS; i++)
    196 			if (equal(name, optlist[i].name)) {
    197 				setoption(optlist[i].letter, val);
    198 				return;
    199 			}
    200 		error("Illegal option -o %s", name);
    201 	}
    202 }
    203 
    204 
    205 STATIC void
    206 setoption(flag, val)
    207 	char flag;
    208 	int val;
    209 	{
    210 	int i;
    211 
    212 	for (i = 0; i < NOPTS; i++)
    213 		if (optlist[i].letter == flag) {
    214 			optlist[i].val = val;
    215 			if (val) {
    216 				/* #%$ hack for ksh semantics */
    217 				if (flag == 'V')
    218 					Eflag = 0;
    219 				else if (flag == 'E')
    220 					Vflag = 0;
    221 			}
    222 			return;
    223 		}
    224 	error("Illegal option -%c", flag);
    225 }
    226 
    227 
    228 
    229 #ifdef mkinit
    230 INCLUDE "options.h"
    231 
    232 SHELLPROC {
    233 	int i;
    234 
    235 	for (i = 0; i < NOPTS; i++)
    236 		optlist[i].val = 0;
    237 	optschanged();
    238 
    239 }
    240 #endif
    241 
    242 
    243 /*
    244  * Set the shell parameters.
    245  */
    246 
    247 void
    248 setparam(argv)
    249 	char **argv;
    250 	{
    251 	char **newparam;
    252 	char **ap;
    253 	int nparam;
    254 
    255 	for (nparam = 0 ; argv[nparam] ; nparam++);
    256 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    257 	while (*argv) {
    258 		*ap++ = savestr(*argv++);
    259 	}
    260 	*ap = NULL;
    261 	freeparam(&shellparam);
    262 	shellparam.malloc = 1;
    263 	shellparam.nparam = nparam;
    264 	shellparam.p = newparam;
    265 	shellparam.optnext = NULL;
    266 }
    267 
    268 
    269 /*
    270  * Free the list of positional parameters.
    271  */
    272 
    273 void
    274 freeparam(param)
    275 	struct shparam *param;
    276 	{
    277 	char **ap;
    278 
    279 	if (param->malloc) {
    280 		for (ap = param->p ; *ap ; ap++)
    281 			ckfree(*ap);
    282 		ckfree(param->p);
    283 	}
    284 }
    285 
    286 
    287 
    288 /*
    289  * The shift builtin command.
    290  */
    291 
    292 shiftcmd(argc, argv)  char **argv; {
    293 	int n;
    294 	char **ap1, **ap2;
    295 
    296 	n = 1;
    297 	if (argc > 1)
    298 		n = number(argv[1]);
    299 	if (n > shellparam.nparam)
    300 		error("can't shift that many");
    301 	INTOFF;
    302 	shellparam.nparam -= n;
    303 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    304 		if (shellparam.malloc)
    305 			ckfree(*ap1);
    306 	}
    307 	ap2 = shellparam.p;
    308 	while ((*ap2++ = *ap1++) != NULL);
    309 	shellparam.optnext = NULL;
    310 	INTON;
    311 	return 0;
    312 }
    313 
    314 
    315 
    316 /*
    317  * The set command builtin.
    318  */
    319 
    320 setcmd(argc, argv)  char **argv; {
    321 	if (argc == 1)
    322 		return showvarscmd(argc, argv);
    323 	INTOFF;
    324 	options(0);
    325 	optschanged();
    326 	if (*argptr != NULL) {
    327 		setparam(argptr);
    328 	}
    329 	INTON;
    330 	return 0;
    331 }
    332 
    333 
    334 /*
    335  * The getopts builtin.  Shellparam.optnext points to the next argument
    336  * to be processed.  Shellparam.optptr points to the next character to
    337  * be processed in the current argument.  If shellparam.optnext is NULL,
    338  * then it's the first time getopts has been called.
    339  */
    340 
    341 getoptscmd(argc, argv)  char **argv; {
    342 	register char *p, *q;
    343 	char c;
    344 	char s[10];
    345 
    346 	if (argc != 3)
    347 		error("Usage: getopts optstring var");
    348 	if (shellparam.optnext == NULL) {
    349 		shellparam.optnext = shellparam.p;
    350 		shellparam.optptr = NULL;
    351 	}
    352 	if ((p = shellparam.optptr) == NULL || *p == '\0') {
    353 		p = *shellparam.optnext;
    354 		if (p == NULL || *p != '-' || *++p == '\0') {
    355 atend:
    356 			fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
    357 			setvar("OPTIND", s, 0);
    358 			shellparam.optnext = NULL;
    359 			return 1;
    360 		}
    361 		shellparam.optnext++;
    362 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    363 			goto atend;
    364 	}
    365 	c = *p++;
    366 	for (q = argv[1] ; *q != c ; ) {
    367 		if (*q == '\0') {
    368 			out1fmt("Illegal option -%c\n", c);
    369 			c = '?';
    370 			goto out;
    371 		}
    372 		if (*++q == ':')
    373 			q++;
    374 	}
    375 	if (*++q == ':') {
    376 		if (*p == '\0' && (p = *shellparam.optnext) == NULL) {
    377 			out1fmt("No arg for -%c option\n", c);
    378 			c = '?';
    379 			goto out;
    380 		}
    381 		shellparam.optnext++;
    382 		setvar("OPTARG", p, 0);
    383 		p = NULL;
    384 	}
    385 out:
    386 	shellparam.optptr = p;
    387 	s[0] = c;
    388 	s[1] = '\0';
    389 	setvar(argv[2], s, 0);
    390 	return 0;
    391 }
    392 
    393 /*
    394  * XXX - should get rid of.  have all builtins use getopt(3).  the
    395  * library getopt must have the BSD extension static variable "optreset"
    396  * otherwise it can't be used within the shell safely.
    397  *
    398  * Standard option processing (a la getopt) for builtin routines.  The
    399  * only argument that is passed to nextopt is the option string; the
    400  * other arguments are unnecessary.  It return the character, or '\0' on
    401  * end of input.
    402  */
    403 
    404 int
    405 nextopt(optstring)
    406 	char *optstring;
    407 	{
    408 	register char *p, *q;
    409 	char c;
    410 
    411 	if ((p = optptr) == NULL || *p == '\0') {
    412 		p = *argptr;
    413 		if (p == NULL || *p != '-' || *++p == '\0')
    414 			return '\0';
    415 		argptr++;
    416 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    417 			return '\0';
    418 	}
    419 	c = *p++;
    420 	for (q = optstring ; *q != c ; ) {
    421 		if (*q == '\0')
    422 			error("Illegal option -%c", c);
    423 		if (*++q == ':')
    424 			q++;
    425 	}
    426 	if (*++q == ':') {
    427 		if (*p == '\0' && (p = *argptr++) == NULL)
    428 			error("No arg for -%c option", c);
    429 		optarg = p;
    430 		p = NULL;
    431 	}
    432 	optptr = p;
    433 	return c;
    434 }
    435