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options.c revision 1.9 
      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 1.9 1994/12/04 07:12:26 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 	char **argv;
     87 	{
     88 	int i;
     89 
     90 	argptr = argv;
     91 	if (argc > 0)
     92 		argptr++;
     93 	for (i = 0; i < NOPTS; i++)
     94 		optlist[i].val = 2;
     95 	options(1);
     96 	if (*argptr == NULL && minusc == NULL)
     97 		sflag = 1;
     98 	if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
     99 		iflag = 1;
    100 	if (mflag == 2)
    101 		mflag = iflag;
    102 	for (i = 0; i < NOPTS; i++)
    103 		if (optlist[i].val == 2)
    104 			optlist[i].val = 0;
    105 	arg0 = argv[0];
    106 	if (sflag == 0 && minusc == NULL) {
    107 		commandname = arg0 = *argptr++;
    108 		setinputfile(commandname, 0);
    109 	}
    110 	shellparam.p = argptr;
    111 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    112 	while (*argptr) {
    113 		shellparam.nparam++;
    114 		argptr++;
    115 	}
    116 	optschanged();
    117 }
    118 
    119 
    120 void
    121 optschanged()
    122 {
    123 	setinteractive(iflag);
    124 #ifndef NO_HISTORY
    125 	histedit();
    126 #endif
    127 	setjobctl(mflag);
    128 }
    129 
    130 /*
    131  * Process shell options.  The global variable argptr contains a pointer
    132  * to the argument list; we advance it past the options.
    133  */
    134 
    135 STATIC void
    136 options(cmdline) {
    137 	register char *p;
    138 	int val;
    139 	int c;
    140 
    141 	if (cmdline)
    142 		minusc = NULL;
    143 	while ((p = *argptr) != NULL) {
    144 		argptr++;
    145 		if ((c = *p++) == '-') {
    146 			val = 1;
    147                         if (p[0] == '\0' || p[0] == '-' && p[1] == '\0') {
    148                                 if (!cmdline) {
    149                                         /* "-" means turn off -x and -v */
    150                                         if (p[0] == '\0')
    151                                                 xflag = vflag = 0;
    152                                         /* "--" means reset params */
    153                                         else if (*argptr == NULL)
    154                                                 setparam(argptr);
    155                                 }
    156 				break;	  /* "-" or  "--" terminates options */
    157 			}
    158 		} else if (c == '+') {
    159 			val = 0;
    160 		} else {
    161 			argptr--;
    162 			break;
    163 		}
    164 		while ((c = *p++) != '\0') {
    165 			if (c == 'c' && cmdline) {
    166 				char *q;
    167 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    168 				if (*p == '\0')
    169 #endif
    170 					q = *argptr++;
    171 				if (q == NULL || minusc != NULL)
    172 					error("Bad -c option");
    173 				minusc = q;
    174 #ifdef NOHACK
    175 				break;
    176 #endif
    177 			} else if (c == 'o') {
    178 				minus_o(*argptr, val);
    179 				if (*argptr)
    180 					argptr++;
    181 			} else {
    182 				setoption(c, val);
    183 			}
    184 		}
    185 	}
    186 }
    187 
    188 STATIC void
    189 minus_o(name, val)
    190 	char *name;
    191 	int val;
    192 {
    193 	int i;
    194 
    195 	if (name == NULL) {
    196 		out1str("Current option settings\n");
    197 		for (i = 0; i < NOPTS; i++)
    198 			out1fmt("%-16s%s\n", optlist[i].name,
    199 				optlist[i].val ? "on" : "off");
    200 	} else {
    201 		for (i = 0; i < NOPTS; i++)
    202 			if (equal(name, optlist[i].name)) {
    203 				setoption(optlist[i].letter, val);
    204 				return;
    205 			}
    206 		error("Illegal option -o %s", name);
    207 	}
    208 }
    209 
    210 
    211 STATIC void
    212 setoption(flag, val)
    213 	char flag;
    214 	int val;
    215 	{
    216 	int i;
    217 
    218 	for (i = 0; i < NOPTS; i++)
    219 		if (optlist[i].letter == flag) {
    220 			optlist[i].val = val;
    221 			if (val) {
    222 				/* #%$ hack for ksh semantics */
    223 				if (flag == 'V')
    224 					Eflag = 0;
    225 				else if (flag == 'E')
    226 					Vflag = 0;
    227 			}
    228 			return;
    229 		}
    230 	error("Illegal option -%c", flag);
    231 }
    232 
    233 
    234 
    235 #ifdef mkinit
    236 INCLUDE "options.h"
    237 
    238 SHELLPROC {
    239 	int i;
    240 
    241 	for (i = 0; i < NOPTS; i++)
    242 		optlist[i].val = 0;
    243 	optschanged();
    244 
    245 }
    246 #endif
    247 
    248 
    249 /*
    250  * Set the shell parameters.
    251  */
    252 
    253 void
    254 setparam(argv)
    255 	char **argv;
    256 	{
    257 	char **newparam;
    258 	char **ap;
    259 	int nparam;
    260 
    261 	for (nparam = 0 ; argv[nparam] ; nparam++);
    262 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    263 	while (*argv) {
    264 		*ap++ = savestr(*argv++);
    265 	}
    266 	*ap = NULL;
    267 	freeparam(&shellparam);
    268 	shellparam.malloc = 1;
    269 	shellparam.nparam = nparam;
    270 	shellparam.p = newparam;
    271 	shellparam.optnext = NULL;
    272 }
    273 
    274 
    275 /*
    276  * Free the list of positional parameters.
    277  */
    278 
    279 void
    280 freeparam(param)
    281 	struct shparam *param;
    282 	{
    283 	char **ap;
    284 
    285 	if (param->malloc) {
    286 		for (ap = param->p ; *ap ; ap++)
    287 			ckfree(*ap);
    288 		ckfree(param->p);
    289 	}
    290 }
    291 
    292 
    293 
    294 /*
    295  * The shift builtin command.
    296  */
    297 
    298 shiftcmd(argc, argv)  char **argv; {
    299 	int n;
    300 	char **ap1, **ap2;
    301 
    302 	n = 1;
    303 	if (argc > 1)
    304 		n = number(argv[1]);
    305 	if (n > shellparam.nparam)
    306 		error("can't shift that many");
    307 	INTOFF;
    308 	shellparam.nparam -= n;
    309 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    310 		if (shellparam.malloc)
    311 			ckfree(*ap1);
    312 	}
    313 	ap2 = shellparam.p;
    314 	while ((*ap2++ = *ap1++) != NULL);
    315 	shellparam.optnext = NULL;
    316 	INTON;
    317 	return 0;
    318 }
    319 
    320 
    321 
    322 /*
    323  * The set command builtin.
    324  */
    325 
    326 setcmd(argc, argv)  char **argv; {
    327 	if (argc == 1)
    328 		return showvarscmd(argc, argv);
    329 	INTOFF;
    330 	options(0);
    331 	optschanged();
    332 	if (*argptr != NULL) {
    333 		setparam(argptr);
    334 	}
    335 	INTON;
    336 	return 0;
    337 }
    338 
    339 
    340 /*
    341  * The getopts builtin.  Shellparam.optnext points to the next argument
    342  * to be processed.  Shellparam.optptr points to the next character to
    343  * be processed in the current argument.  If shellparam.optnext is NULL,
    344  * then it's the first time getopts has been called.
    345  */
    346 
    347 getoptscmd(argc, argv)  char **argv; {
    348 	register char *p, *q;
    349 	char c;
    350 	char s[10];
    351 
    352 	if (argc != 3)
    353 		error("Usage: getopts optstring var");
    354 	if (shellparam.optnext == NULL) {
    355 		shellparam.optnext = shellparam.p;
    356 		shellparam.optptr = NULL;
    357 	}
    358 	if ((p = shellparam.optptr) == NULL || *p == '\0') {
    359 		p = *shellparam.optnext;
    360 		if (p == NULL || *p != '-' || *++p == '\0') {
    361 atend:
    362 			fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
    363 			setvar("OPTIND", s, 0);
    364 			shellparam.optnext = NULL;
    365 			return 1;
    366 		}
    367 		shellparam.optnext++;
    368 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    369 			goto atend;
    370 	}
    371 	c = *p++;
    372 	for (q = argv[1] ; *q != c ; ) {
    373 		if (*q == '\0') {
    374 			out1fmt("Illegal option -%c\n", c);
    375 			c = '?';
    376 			goto out;
    377 		}
    378 		if (*++q == ':')
    379 			q++;
    380 	}
    381 	if (*++q == ':') {
    382 		if (*p == '\0' && (p = *shellparam.optnext) == NULL) {
    383 			out1fmt("No arg for -%c option\n", c);
    384 			c = '?';
    385 			goto out;
    386 		}
    387 		shellparam.optnext++;
    388 		setvar("OPTARG", p, 0);
    389 		p = NULL;
    390 	}
    391 out:
    392 	shellparam.optptr = p;
    393 	s[0] = c;
    394 	s[1] = '\0';
    395 	setvar(argv[2], s, 0);
    396 	return 0;
    397 }
    398 
    399 /*
    400  * XXX - should get rid of.  have all builtins use getopt(3).  the
    401  * library getopt must have the BSD extension static variable "optreset"
    402  * otherwise it can't be used within the shell safely.
    403  *
    404  * Standard option processing (a la getopt) for builtin routines.  The
    405  * only argument that is passed to nextopt is the option string; the
    406  * other arguments are unnecessary.  It return the character, or '\0' on
    407  * end of input.
    408  */
    409 
    410 int
    411 nextopt(optstring)
    412 	char *optstring;
    413 	{
    414 	register char *p, *q;
    415 	char c;
    416 
    417 	if ((p = optptr) == NULL || *p == '\0') {
    418 		p = *argptr;
    419 		if (p == NULL || *p != '-' || *++p == '\0')
    420 			return '\0';
    421 		argptr++;
    422 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    423 			return '\0';
    424 	}
    425 	c = *p++;
    426 	for (q = optstring ; *q != c ; ) {
    427 		if (*q == '\0')
    428 			error("Illegal option -%c", c);
    429 		if (*++q == ':')
    430 			q++;
    431 	}
    432 	if (*++q == ':') {
    433 		if (*p == '\0' && (p = *argptr++) == NULL)
    434 			error("No arg for -%c option", c);
    435 		optarg = p;
    436 		p = NULL;
    437 	}
    438 	optptr = p;
    439 	return c;
    440 }
    441