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options.c revision 1.5 
      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 
     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 STATIC void minus_o(char *, int);
     69 #else
     70 STATIC void options();
     71 STATIC void setoption();
     72 STATIC void minus_o();
     73 #endif
     74 
     75 
     76 
     77 /*
     78  * Process the shell command line arguments.
     79  */
     80 
     81 void
     82 procargs(argc, argv)
     83 	char **argv;
     84 	{
     85 	int i;
     86 
     87 	argptr = argv;
     88 	if (argc > 0)
     89 		argptr++;
     90 	for (i = 0; i < NOPTS; i++)
     91 		optlist[i].val = 2;
     92 	options(1);
     93 	if (*argptr == NULL && minusc == NULL)
     94 		sflag = 1;
     95 	if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
     96 		iflag = 1;
     97 	if (mflag == 2)
     98 		mflag = iflag;
     99 	for (i = 0; i < NOPTS; i++)
    100 		if (optlist[i].val == 2)
    101 			optlist[i].val = 0;
    102 	arg0 = argv[0];
    103 	if (sflag == 0 && minusc == NULL) {
    104 		commandname = arg0 = *argptr++;
    105 		setinputfile(commandname, 0);
    106 	}
    107 	shellparam.p = argptr;
    108 	/* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
    109 	while (*argptr) {
    110 		shellparam.nparam++;
    111 		argptr++;
    112 	}
    113 	optschanged();
    114 }
    115 
    116 
    117 optschanged() {
    118 	setinteractive(iflag);
    119 	histedit();
    120 	setjobctl(mflag);
    121 }
    122 
    123 /*
    124  * Process shell options.  The global variable argptr contains a pointer
    125  * to the argument list; we advance it past the options.
    126  */
    127 
    128 STATIC void
    129 options(cmdline) {
    130 	register char *p;
    131 	int val;
    132 	int c;
    133 
    134 	if (cmdline)
    135 		minusc = NULL;
    136 	while ((p = *argptr) != NULL) {
    137 		argptr++;
    138 		if ((c = *p++) == '-') {
    139 			val = 1;
    140                         if (p[0] == '\0' || p[0] == '-' && p[1] == '\0') {
    141                                 if (!cmdline) {
    142                                         /* "-" means turn off -x and -v */
    143                                         if (p[0] == '\0')
    144                                                 xflag = vflag = 0;
    145                                         /* "--" means reset params */
    146                                         else if (*argptr == NULL)
    147                                                 setparam(argptr);
    148                                 }
    149 				break;	  /* "-" or  "--" terminates options */
    150 			}
    151 		} else if (c == '+') {
    152 			val = 0;
    153 		} else {
    154 			argptr--;
    155 			break;
    156 		}
    157 		while ((c = *p++) != '\0') {
    158 			if (c == 'c' && cmdline) {
    159 				char *q;
    160 #ifdef NOHACK	/* removing this code allows sh -ce 'foo' for compat */
    161 				if (*p == '\0')
    162 #endif
    163 					q = *argptr++;
    164 				if (q == NULL || minusc != NULL)
    165 					error("Bad -c option");
    166 				minusc = q;
    167 #ifdef NOHACK
    168 				break;
    169 #endif
    170 			} else if (c == 'o') {
    171 				minus_o(*argptr, val);
    172 				if (*argptr)
    173 					argptr++;
    174 			} else {
    175 				setoption(c, val);
    176 			}
    177 		}
    178 	}
    179 }
    180 
    181 STATIC void
    182 minus_o(name, val)
    183 	char *name;
    184 	int val;
    185 {
    186 	int i;
    187 
    188 	if (name == NULL) {
    189 		out1str("Current option settings\n");
    190 		for (i = 0; i < NOPTS; i++)
    191 			out1fmt("%-16s%s\n", optlist[i].name,
    192 				optlist[i].val ? "on" : "off");
    193 	} else {
    194 		for (i = 0; i < NOPTS; i++)
    195 			if (equal(name, optlist[i].name)) {
    196 				setoption(optlist[i].letter, val);
    197 				return;
    198 			}
    199 		error("Illegal option -o %s", name);
    200 	}
    201 }
    202 
    203 
    204 STATIC void
    205 setoption(flag, val)
    206 	char flag;
    207 	int val;
    208 	{
    209 	int i;
    210 
    211 	for (i = 0; i < NOPTS; i++)
    212 		if (optlist[i].letter == flag) {
    213 			optlist[i].val = val;
    214 			if (val) {
    215 				/* #%$ hack for ksh semantics */
    216 				if (flag == 'V')
    217 					Eflag = 0;
    218 				else if (flag == 'E')
    219 					Vflag = 0;
    220 			}
    221 			return;
    222 		}
    223 	error("Illegal option -%c", flag);
    224 }
    225 
    226 
    227 
    228 #ifdef mkinit
    229 INCLUDE "options.h"
    230 
    231 SHELLPROC {
    232 	int i;
    233 
    234 	for (i = 0; i < NOPTS; i++)
    235 		optlist[i].val = 0;
    236 	optschanged();
    237 
    238 }
    239 #endif
    240 
    241 
    242 /*
    243  * Set the shell parameters.
    244  */
    245 
    246 void
    247 setparam(argv)
    248 	char **argv;
    249 	{
    250 	char **newparam;
    251 	char **ap;
    252 	int nparam;
    253 
    254 	for (nparam = 0 ; argv[nparam] ; nparam++);
    255 	ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
    256 	while (*argv) {
    257 		*ap++ = savestr(*argv++);
    258 	}
    259 	*ap = NULL;
    260 	freeparam(&shellparam);
    261 	shellparam.malloc = 1;
    262 	shellparam.nparam = nparam;
    263 	shellparam.p = newparam;
    264 	shellparam.optnext = NULL;
    265 }
    266 
    267 
    268 /*
    269  * Free the list of positional parameters.
    270  */
    271 
    272 void
    273 freeparam(param)
    274 	struct shparam *param;
    275 	{
    276 	char **ap;
    277 
    278 	if (param->malloc) {
    279 		for (ap = param->p ; *ap ; ap++)
    280 			ckfree(*ap);
    281 		ckfree(param->p);
    282 	}
    283 }
    284 
    285 
    286 
    287 /*
    288  * The shift builtin command.
    289  */
    290 
    291 shiftcmd(argc, argv)  char **argv; {
    292 	int n;
    293 	char **ap1, **ap2;
    294 
    295 	n = 1;
    296 	if (argc > 1)
    297 		n = number(argv[1]);
    298 	if (n > shellparam.nparam)
    299 		error("can't shift that many");
    300 	INTOFF;
    301 	shellparam.nparam -= n;
    302 	for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
    303 		if (shellparam.malloc)
    304 			ckfree(*ap1);
    305 	}
    306 	ap2 = shellparam.p;
    307 	while ((*ap2++ = *ap1++) != NULL);
    308 	shellparam.optnext = NULL;
    309 	INTON;
    310 	return 0;
    311 }
    312 
    313 
    314 
    315 /*
    316  * The set command builtin.
    317  */
    318 
    319 setcmd(argc, argv)  char **argv; {
    320 	if (argc == 1)
    321 		return showvarscmd(argc, argv);
    322 	INTOFF;
    323 	options(0);
    324 	optschanged();
    325 	if (*argptr != NULL) {
    326 		setparam(argptr);
    327 	}
    328 	INTON;
    329 	return 0;
    330 }
    331 
    332 
    333 /*
    334  * The getopts builtin.  Shellparam.optnext points to the next argument
    335  * to be processed.  Shellparam.optptr points to the next character to
    336  * be processed in the current argument.  If shellparam.optnext is NULL,
    337  * then it's the first time getopts has been called.
    338  */
    339 
    340 getoptscmd(argc, argv)  char **argv; {
    341 	register char *p, *q;
    342 	char c;
    343 	char s[10];
    344 
    345 	if (argc != 3)
    346 		error("Usage: getopts optstring var");
    347 	if (shellparam.optnext == NULL) {
    348 		shellparam.optnext = shellparam.p;
    349 		shellparam.optptr = NULL;
    350 	}
    351 	if ((p = shellparam.optptr) == NULL || *p == '\0') {
    352 		p = *shellparam.optnext;
    353 		if (p == NULL || *p != '-' || *++p == '\0') {
    354 atend:
    355 			fmtstr(s, 10, "%d", shellparam.optnext - shellparam.p + 1);
    356 			setvar("OPTIND", s, 0);
    357 			shellparam.optnext = NULL;
    358 			return 1;
    359 		}
    360 		shellparam.optnext++;
    361 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    362 			goto atend;
    363 	}
    364 	c = *p++;
    365 	for (q = argv[1] ; *q != c ; ) {
    366 		if (*q == '\0') {
    367 			out1fmt("Illegal option -%c\n", c);
    368 			c = '?';
    369 			goto out;
    370 		}
    371 		if (*++q == ':')
    372 			q++;
    373 	}
    374 	if (*++q == ':') {
    375 		if (*p == '\0' && (p = *shellparam.optnext) == NULL) {
    376 			out1fmt("No arg for -%c option\n", c);
    377 			c = '?';
    378 			goto out;
    379 		}
    380 		shellparam.optnext++;
    381 		setvar("OPTARG", p, 0);
    382 		p = NULL;
    383 	}
    384 out:
    385 	shellparam.optptr = p;
    386 	s[0] = c;
    387 	s[1] = '\0';
    388 	setvar(argv[2], s, 0);
    389 	return 0;
    390 }
    391 
    392 /*
    393  * XXX - should get rid of.  have all builtins use getopt(3).  the
    394  * library getopt must have the BSD extension static variable "optreset"
    395  * otherwise it can't be used within the shell safely.
    396  *
    397  * Standard option processing (a la getopt) for builtin routines.  The
    398  * only argument that is passed to nextopt is the option string; the
    399  * other arguments are unnecessary.  It return the character, or '\0' on
    400  * end of input.
    401  */
    402 
    403 int
    404 nextopt(optstring)
    405 	char *optstring;
    406 	{
    407 	register char *p, *q;
    408 	char c;
    409 
    410 	if ((p = optptr) == NULL || *p == '\0') {
    411 		p = *argptr;
    412 		if (p == NULL || *p != '-' || *++p == '\0')
    413 			return '\0';
    414 		argptr++;
    415 		if (p[0] == '-' && p[1] == '\0')	/* check for "--" */
    416 			return '\0';
    417 	}
    418 	c = *p++;
    419 	for (q = optstring ; *q != c ; ) {
    420 		if (*q == '\0')
    421 			error("Illegal option -%c", c);
    422 		if (*++q == ':')
    423 			q++;
    424 	}
    425 	if (*++q == ':') {
    426 		if (*p == '\0' && (p = *argptr++) == NULL)
    427 			error("No arg for -%c option", c);
    428 		optarg = p;
    429 		p = NULL;
    430 	}
    431 	optptr = p;
    432 	return c;
    433 }
    434