options.c revision 1.36 1 /* $NetBSD: options.c,v 1.36 2004/01/05 23:23:32 jmmv Exp $ */
2
3 /*-
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/cdefs.h>
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)options.c 8.2 (Berkeley) 5/4/95";
39 #else
40 __RCSID("$NetBSD: options.c,v 1.36 2004/01/05 23:23:32 jmmv Exp $");
41 #endif
42 #endif /* not lint */
43
44 #include <signal.h>
45 #include <unistd.h>
46 #include <stdlib.h>
47
48 #include "shell.h"
49 #define DEFINE_OPTIONS
50 #include "options.h"
51 #undef DEFINE_OPTIONS
52 #include "nodes.h" /* for other header files */
53 #include "eval.h"
54 #include "jobs.h"
55 #include "input.h"
56 #include "output.h"
57 #include "trap.h"
58 #include "var.h"
59 #include "memalloc.h"
60 #include "error.h"
61 #include "mystring.h"
62 #ifndef SMALL
63 #include "myhistedit.h"
64 #endif
65 #include "show.h"
66
67 char *arg0; /* value of $0 */
68 struct shparam shellparam; /* current positional parameters */
69 char **argptr; /* argument list for builtin commands */
70 char *optionarg; /* set by nextopt (like getopt) */
71 char *optptr; /* used by nextopt */
72
73 char *minusc; /* argument to -c option */
74
75
76 STATIC void options(int);
77 STATIC void minus_o(char *, int);
78 STATIC void setoption(int, int);
79 STATIC int getopts(char *, char *, char **, char ***, char **);
80
81
82 /*
83 * Process the shell command line arguments.
84 */
85
86 void
87 procargs(int argc, char **argv)
88 {
89 int i;
90
91 argptr = argv;
92 if (argc > 0)
93 argptr++;
94 for (i = 0; i < NOPTS; i++)
95 optlist[i].val = 2;
96 options(1);
97 if (*argptr == NULL && minusc == NULL)
98 sflag = 1;
99 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
100 iflag = 1;
101 if (mflag == 2)
102 mflag = iflag;
103 for (i = 0; i < NOPTS; i++)
104 if (optlist[i].val == 2)
105 optlist[i].val = 0;
106 #if DEBUG == 2
107 debug = 1;
108 #endif
109 arg0 = argv[0];
110 if (sflag == 0 && minusc == NULL) {
111 commandname = argv[0];
112 arg0 = *argptr++;
113 setinputfile(arg0, 0);
114 commandname = arg0;
115 }
116 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
117 if (minusc != NULL) {
118 if (argptr == NULL || *argptr == NULL)
119 error("Bad -c option");
120 minusc = *argptr++;
121 if (*argptr != 0)
122 arg0 = *argptr++;
123 }
124
125 shellparam.p = argptr;
126 shellparam.reset = 1;
127 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
128 while (*argptr) {
129 shellparam.nparam++;
130 argptr++;
131 }
132 optschanged();
133 }
134
135
136 void
137 optschanged(void)
138 {
139 setinteractive(iflag);
140 #ifndef SMALL
141 histedit();
142 #endif
143 setjobctl(mflag);
144 }
145
146 /*
147 * Process shell options. The global variable argptr contains a pointer
148 * to the argument list; we advance it past the options.
149 */
150
151 STATIC void
152 options(int cmdline)
153 {
154 char *p;
155 int val;
156 int c;
157
158 if (cmdline)
159 minusc = NULL;
160 while ((p = *argptr) != NULL) {
161 argptr++;
162 if ((c = *p++) == '-') {
163 val = 1;
164 if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
165 if (!cmdline) {
166 /* "-" means turn off -x and -v */
167 if (p[0] == '\0')
168 xflag = vflag = 0;
169 /* "--" means reset params */
170 else if (*argptr == NULL)
171 setparam(argptr);
172 }
173 break; /* "-" or "--" terminates options */
174 }
175 } else if (c == '+') {
176 val = 0;
177 } else {
178 argptr--;
179 break;
180 }
181 while ((c = *p++) != '\0') {
182 if (c == 'c' && cmdline) {
183 minusc = ""; /* command is after shell args*/
184 } else if (c == 'o') {
185 minus_o(*argptr, val);
186 if (*argptr)
187 argptr++;
188 } else {
189 setoption(c, val);
190 }
191 }
192 }
193 }
194
195 static void
196 set_opt_val(int i, int val)
197 {
198 int j;
199 int flag;
200
201 if (val && (flag = optlist[i].opt_set)) {
202 /* some options (eg vi/emacs) are mutually exclusive */
203 for (j = 0; j < NOPTS; j++)
204 if (optlist[j].opt_set == flag)
205 optlist[j].val = 0;
206 }
207 optlist[i].val = val;
208 #ifdef DEBUG
209 if (&optlist[i].val == &debug)
210 opentrace();
211 #endif
212 }
213
214 STATIC void
215 minus_o(char *name, int val)
216 {
217 int i;
218
219 if (name == NULL) {
220 out1str("Current option settings\n");
221 for (i = 0; i < NOPTS; i++)
222 out1fmt("%-16s%s\n", optlist[i].name,
223 optlist[i].val ? "on" : "off");
224 } else {
225 for (i = 0; i < NOPTS; i++)
226 if (equal(name, optlist[i].name)) {
227 set_opt_val(i, val);
228 return;
229 }
230 error("Illegal option -o %s", name);
231 }
232 }
233
234
235 STATIC void
236 setoption(int flag, int val)
237 {
238 int i;
239
240 for (i = 0; i < NOPTS; i++)
241 if (optlist[i].letter == flag) {
242 set_opt_val( i, val );
243 return;
244 }
245 error("Illegal option -%c", flag);
246 /* NOTREACHED */
247 }
248
249
250
251 #ifdef mkinit
252 INCLUDE "options.h"
253
254 SHELLPROC {
255 int i;
256
257 for (i = 0; optlist[i].name; i++)
258 optlist[i].val = 0;
259 optschanged();
260
261 }
262 #endif
263
264
265 /*
266 * Set the shell parameters.
267 */
268
269 void
270 setparam(char **argv)
271 {
272 char **newparam;
273 char **ap;
274 int nparam;
275
276 for (nparam = 0 ; argv[nparam] ; nparam++);
277 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
278 while (*argv) {
279 *ap++ = savestr(*argv++);
280 }
281 *ap = NULL;
282 freeparam(&shellparam);
283 shellparam.malloc = 1;
284 shellparam.nparam = nparam;
285 shellparam.p = newparam;
286 shellparam.optnext = NULL;
287 }
288
289
290 /*
291 * Free the list of positional parameters.
292 */
293
294 void
295 freeparam(volatile struct shparam *param)
296 {
297 char **ap;
298
299 if (param->malloc) {
300 for (ap = param->p ; *ap ; ap++)
301 ckfree(*ap);
302 ckfree(param->p);
303 }
304 }
305
306
307
308 /*
309 * The shift builtin command.
310 */
311
312 int
313 shiftcmd(int argc, char **argv)
314 {
315 int n;
316 char **ap1, **ap2;
317
318 n = 1;
319 if (argc > 1)
320 n = number(argv[1]);
321 if (n > shellparam.nparam)
322 error("can't shift that many");
323 INTOFF;
324 shellparam.nparam -= n;
325 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
326 if (shellparam.malloc)
327 ckfree(*ap1);
328 }
329 ap2 = shellparam.p;
330 while ((*ap2++ = *ap1++) != NULL);
331 shellparam.optnext = NULL;
332 INTON;
333 return 0;
334 }
335
336
337
338 /*
339 * The set command builtin.
340 */
341
342 int
343 setcmd(int argc, char **argv)
344 {
345 if (argc == 1)
346 return showvars(0, 0, 1);
347 INTOFF;
348 options(0);
349 optschanged();
350 if (*argptr != NULL) {
351 setparam(argptr);
352 }
353 INTON;
354 return 0;
355 }
356
357
358 void
359 getoptsreset(value)
360 const char *value;
361 {
362 if (number(value) == 1) {
363 shellparam.optnext = NULL;
364 shellparam.reset = 1;
365 }
366 }
367
368 /*
369 * The getopts builtin. Shellparam.optnext points to the next argument
370 * to be processed. Shellparam.optptr points to the next character to
371 * be processed in the current argument. If shellparam.optnext is NULL,
372 * then it's the first time getopts has been called.
373 */
374
375 int
376 getoptscmd(int argc, char **argv)
377 {
378 char **optbase;
379
380 if (argc < 3)
381 error("usage: getopts optstring var [arg]");
382 else if (argc == 3)
383 optbase = shellparam.p;
384 else
385 optbase = &argv[3];
386
387 if (shellparam.reset == 1) {
388 shellparam.optnext = optbase;
389 shellparam.optptr = NULL;
390 shellparam.reset = 0;
391 }
392
393 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
394 &shellparam.optptr);
395 }
396
397 STATIC int
398 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr)
399 {
400 char *p, *q;
401 char c = '?';
402 int done = 0;
403 int ind = 0;
404 int err = 0;
405 char s[12];
406
407 if ((p = *optpptr) == NULL || *p == '\0') {
408 /* Current word is done, advance */
409 if (*optnext == NULL)
410 return 1;
411 p = **optnext;
412 if (p == NULL || *p != '-' || *++p == '\0') {
413 atend:
414 ind = *optnext - optfirst + 1;
415 *optnext = NULL;
416 p = NULL;
417 done = 1;
418 goto out;
419 }
420 (*optnext)++;
421 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
422 goto atend;
423 }
424
425 c = *p++;
426 for (q = optstr; *q != c; ) {
427 if (*q == '\0') {
428 if (optstr[0] == ':') {
429 s[0] = c;
430 s[1] = '\0';
431 err |= setvarsafe("OPTARG", s, 0);
432 } else {
433 outfmt(&errout, "Illegal option -%c\n", c);
434 (void) unsetvar("OPTARG", 0);
435 }
436 c = '?';
437 goto bad;
438 }
439 if (*++q == ':')
440 q++;
441 }
442
443 if (*++q == ':') {
444 if (*p == '\0' && (p = **optnext) == NULL) {
445 if (optstr[0] == ':') {
446 s[0] = c;
447 s[1] = '\0';
448 err |= setvarsafe("OPTARG", s, 0);
449 c = ':';
450 } else {
451 outfmt(&errout, "No arg for -%c option\n", c);
452 (void) unsetvar("OPTARG", 0);
453 c = '?';
454 }
455 goto bad;
456 }
457
458 if (p == **optnext)
459 (*optnext)++;
460 err |= setvarsafe("OPTARG", p, 0);
461 p = NULL;
462 } else
463 err |= setvarsafe("OPTARG", "", 0);
464 ind = *optnext - optfirst + 1;
465 goto out;
466
467 bad:
468 ind = 1;
469 *optnext = NULL;
470 p = NULL;
471 out:
472 *optpptr = p;
473 fmtstr(s, sizeof(s), "%d", ind);
474 err |= setvarsafe("OPTIND", s, VNOFUNC);
475 s[0] = c;
476 s[1] = '\0';
477 err |= setvarsafe(optvar, s, 0);
478 if (err) {
479 *optnext = NULL;
480 *optpptr = NULL;
481 flushall();
482 exraise(EXERROR);
483 }
484 return done;
485 }
486
487 /*
488 * XXX - should get rid of. have all builtins use getopt(3). the
489 * library getopt must have the BSD extension static variable "optreset"
490 * otherwise it can't be used within the shell safely.
491 *
492 * Standard option processing (a la getopt) for builtin routines. The
493 * only argument that is passed to nextopt is the option string; the
494 * other arguments are unnecessary. It return the character, or '\0' on
495 * end of input.
496 */
497
498 int
499 nextopt(const char *optstring)
500 {
501 char *p;
502 const char *q;
503 char c;
504
505 if ((p = optptr) == NULL || *p == '\0') {
506 p = *argptr;
507 if (p == NULL || *p != '-' || *++p == '\0')
508 return '\0';
509 argptr++;
510 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
511 return '\0';
512 }
513 c = *p++;
514 for (q = optstring ; *q != c ; ) {
515 if (*q == '\0')
516 error("Illegal option -%c", c);
517 if (*++q == ':')
518 q++;
519 }
520 if (*++q == ':') {
521 if (*p == '\0' && (p = *argptr++) == NULL)
522 error("No arg for -%c option", c);
523 optionarg = p;
524 p = NULL;
525 }
526 optptr = p;
527 return c;
528 }
529