1 /* $NetBSD: options.c,v 1.43 2012/03/20 18:42:29 matt 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 1.43 2012/03/20 18:42:29 matt 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 "builtins.h"
53 #include "nodes.h" /* for other header files */
54 #include "eval.h"
55 #include "jobs.h"
56 #include "input.h"
57 #include "output.h"
58 #include "trap.h"
59 #include "var.h"
60 #include "memalloc.h"
61 #include "error.h"
62 #include "mystring.h"
63 #ifndef SMALL
64 #include "myhistedit.h"
65 #endif
66 #include "show.h"
67
68 char *arg0; /* value of $0 */
69 struct shparam shellparam; /* current positional parameters */
70 char **argptr; /* argument list for builtin commands */
71 char *optionarg; /* set by nextopt (like getopt) */
72 char *optptr; /* used by nextopt */
73
74 char *minusc; /* argument to -c option */
75
76
77 STATIC void options(int);
78 STATIC void minus_o(char *, int);
79 STATIC void setoption(int, int);
80 STATIC int getopts(char *, char *, char **, char ***, char **);
81
82
83 /*
84 * Process the shell command line arguments.
85 */
86
87 void
procargs(int argc,char ** argv)88 procargs(int argc, char **argv)
89 {
90 size_t i;
91
92 argptr = argv;
93 if (argc > 0)
94 argptr++;
95 for (i = 0; i < NOPTS; i++)
96 optlist[i].val = 2;
97 options(1);
98 if (*argptr == NULL && minusc == NULL)
99 sflag = 1;
100 if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1))
101 iflag = 1;
102 if (iflag == 1 && sflag == 2)
103 iflag = 2;
104 if (mflag == 2)
105 mflag = iflag;
106 for (i = 0; i < NOPTS; i++)
107 if (optlist[i].val == 2)
108 optlist[i].val = 0;
109 #if DEBUG == 2
110 debug = 1;
111 #endif
112 arg0 = argv[0];
113 if (sflag == 0 && minusc == NULL) {
114 commandname = argv[0];
115 arg0 = *argptr++;
116 setinputfile(arg0, 0);
117 commandname = arg0;
118 }
119 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
120 if (minusc != NULL) {
121 if (argptr == NULL || *argptr == NULL)
122 error("Bad -c option");
123 minusc = *argptr++;
124 if (*argptr != 0)
125 arg0 = *argptr++;
126 }
127
128 shellparam.p = argptr;
129 shellparam.reset = 1;
130 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
131 while (*argptr) {
132 shellparam.nparam++;
133 argptr++;
134 }
135 optschanged();
136 }
137
138
139 void
optschanged(void)140 optschanged(void)
141 {
142 setinteractive(iflag);
143 #ifndef SMALL
144 histedit();
145 #endif
146 setjobctl(mflag);
147 }
148
149 /*
150 * Process shell options. The global variable argptr contains a pointer
151 * to the argument list; we advance it past the options.
152 */
153
154 STATIC void
options(int cmdline)155 options(int cmdline)
156 {
157 static char empty[] = "";
158 char *p;
159 int val;
160 int c;
161
162 if (cmdline)
163 minusc = NULL;
164 while ((p = *argptr) != NULL) {
165 argptr++;
166 if ((c = *p++) == '-') {
167 val = 1;
168 if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
169 if (!cmdline) {
170 /* "-" means turn off -x and -v */
171 if (p[0] == '\0')
172 xflag = vflag = 0;
173 /* "--" means reset params */
174 else if (*argptr == NULL)
175 setparam(argptr);
176 }
177 break; /* "-" or "--" terminates options */
178 }
179 } else if (c == '+') {
180 val = 0;
181 } else {
182 argptr--;
183 break;
184 }
185 while ((c = *p++) != '\0') {
186 if (c == 'c' && cmdline) {
187 /* command is after shell args*/
188 minusc = empty;
189 } else if (c == 'o') {
190 minus_o(*argptr, val);
191 if (*argptr)
192 argptr++;
193 } else {
194 setoption(c, val);
195 }
196 }
197 }
198 }
199
200 static void
set_opt_val(size_t i,int val)201 set_opt_val(size_t i, int val)
202 {
203 size_t j;
204 int flag;
205
206 if (val && (flag = optlist[i].opt_set)) {
207 /* some options (eg vi/emacs) are mutually exclusive */
208 for (j = 0; j < NOPTS; j++)
209 if (optlist[j].opt_set == flag)
210 optlist[j].val = 0;
211 }
212 optlist[i].val = val;
213 #ifdef DEBUG
214 if (&optlist[i].val == &debug)
215 opentrace();
216 #endif
217 }
218
219 STATIC void
minus_o(char * name,int val)220 minus_o(char *name, int val)
221 {
222 size_t i;
223
224 if (name == NULL) {
225 if (val) {
226 out1str("Current option settings\n");
227 for (i = 0; i < NOPTS; i++) {
228 out1fmt("%-16s%s\n", optlist[i].name,
229 optlist[i].val ? "on" : "off");
230 }
231 } else {
232 out1str("set");
233 for (i = 0; i < NOPTS; i++) {
234 out1fmt(" %co %s",
235 "+-"[optlist[i].val], optlist[i].name);
236 }
237 out1str("\n");
238 }
239 } else {
240 for (i = 0; i < NOPTS; i++)
241 if (equal(name, optlist[i].name)) {
242 set_opt_val(i, val);
243 return;
244 }
245 error("Illegal option -o %s", name);
246 }
247 }
248
249
250 STATIC void
setoption(int flag,int val)251 setoption(int flag, int val)
252 {
253 size_t i;
254
255 for (i = 0; i < NOPTS; i++)
256 if (optlist[i].letter == flag) {
257 set_opt_val( i, val );
258 return;
259 }
260 error("Illegal option -%c", flag);
261 /* NOTREACHED */
262 }
263
264
265
266 #ifdef mkinit
267 INCLUDE "options.h"
268
269 SHELLPROC {
270 int i;
271
272 for (i = 0; optlist[i].name; i++)
273 optlist[i].val = 0;
274 optschanged();
275
276 }
277 #endif
278
279
280 /*
281 * Set the shell parameters.
282 */
283
284 void
setparam(char ** argv)285 setparam(char **argv)
286 {
287 char **newparam;
288 char **ap;
289 int nparam;
290
291 for (nparam = 0 ; argv[nparam] ; nparam++)
292 continue;
293 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
294 while (*argv) {
295 *ap++ = savestr(*argv++);
296 }
297 *ap = NULL;
298 freeparam(&shellparam);
299 shellparam.malloc = 1;
300 shellparam.nparam = nparam;
301 shellparam.p = newparam;
302 shellparam.optnext = NULL;
303 }
304
305
306 /*
307 * Free the list of positional parameters.
308 */
309
310 void
freeparam(volatile struct shparam * param)311 freeparam(volatile struct shparam *param)
312 {
313 char **ap;
314
315 if (param->malloc) {
316 for (ap = param->p ; *ap ; ap++)
317 ckfree(*ap);
318 ckfree(param->p);
319 }
320 }
321
322
323
324 /*
325 * The shift builtin command.
326 */
327
328 int
shiftcmd(int argc,char ** argv)329 shiftcmd(int argc, char **argv)
330 {
331 int n;
332 char **ap1, **ap2;
333
334 n = 1;
335 if (argc > 1)
336 n = number(argv[1]);
337 if (n > shellparam.nparam)
338 error("can't shift that many");
339 INTOFF;
340 shellparam.nparam -= n;
341 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
342 if (shellparam.malloc)
343 ckfree(*ap1);
344 }
345 ap2 = shellparam.p;
346 while ((*ap2++ = *ap1++) != NULL);
347 shellparam.optnext = NULL;
348 INTON;
349 return 0;
350 }
351
352
353
354 /*
355 * The set command builtin.
356 */
357
358 int
setcmd(int argc,char ** argv)359 setcmd(int argc, char **argv)
360 {
361 if (argc == 1)
362 return showvars(0, 0, 1);
363 INTOFF;
364 options(0);
365 optschanged();
366 if (*argptr != NULL) {
367 setparam(argptr);
368 }
369 INTON;
370 return 0;
371 }
372
373
374 void
getoptsreset(const char * value)375 getoptsreset(const char *value)
376 {
377 if (number(value) == 1) {
378 shellparam.optnext = NULL;
379 shellparam.reset = 1;
380 }
381 }
382
383 /*
384 * The getopts builtin. Shellparam.optnext points to the next argument
385 * to be processed. Shellparam.optptr points to the next character to
386 * be processed in the current argument. If shellparam.optnext is NULL,
387 * then it's the first time getopts has been called.
388 */
389
390 int
getoptscmd(int argc,char ** argv)391 getoptscmd(int argc, char **argv)
392 {
393 char **optbase;
394
395 if (argc < 3)
396 error("usage: getopts optstring var [arg]");
397 else if (argc == 3)
398 optbase = shellparam.p;
399 else
400 optbase = &argv[3];
401
402 if (shellparam.reset == 1) {
403 shellparam.optnext = optbase;
404 shellparam.optptr = NULL;
405 shellparam.reset = 0;
406 }
407
408 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
409 &shellparam.optptr);
410 }
411
412 STATIC int
getopts(char * optstr,char * optvar,char ** optfirst,char *** optnext,char ** optpptr)413 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr)
414 {
415 char *p, *q;
416 char c = '?';
417 int done = 0;
418 int ind = 0;
419 int err = 0;
420 char s[12];
421
422 if ((p = *optpptr) == NULL || *p == '\0') {
423 /* Current word is done, advance */
424 if (*optnext == NULL)
425 return 1;
426 p = **optnext;
427 if (p == NULL || *p != '-' || *++p == '\0') {
428 atend:
429 ind = *optnext - optfirst + 1;
430 *optnext = NULL;
431 p = NULL;
432 done = 1;
433 goto out;
434 }
435 (*optnext)++;
436 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
437 goto atend;
438 }
439
440 c = *p++;
441 for (q = optstr; *q != c; ) {
442 if (*q == '\0') {
443 if (optstr[0] == ':') {
444 s[0] = c;
445 s[1] = '\0';
446 err |= setvarsafe("OPTARG", s, 0);
447 } else {
448 outfmt(&errout, "Illegal option -%c\n", c);
449 (void) unsetvar("OPTARG", 0);
450 }
451 c = '?';
452 goto bad;
453 }
454 if (*++q == ':')
455 q++;
456 }
457
458 if (*++q == ':') {
459 if (*p == '\0' && (p = **optnext) == NULL) {
460 if (optstr[0] == ':') {
461 s[0] = c;
462 s[1] = '\0';
463 err |= setvarsafe("OPTARG", s, 0);
464 c = ':';
465 } else {
466 outfmt(&errout, "No arg for -%c option\n", c);
467 (void) unsetvar("OPTARG", 0);
468 c = '?';
469 }
470 goto bad;
471 }
472
473 if (p == **optnext)
474 (*optnext)++;
475 err |= setvarsafe("OPTARG", p, 0);
476 p = NULL;
477 } else
478 err |= setvarsafe("OPTARG", "", 0);
479 ind = *optnext - optfirst + 1;
480 goto out;
481
482 bad:
483 ind = 1;
484 *optnext = NULL;
485 p = NULL;
486 out:
487 *optpptr = p;
488 fmtstr(s, sizeof(s), "%d", ind);
489 err |= setvarsafe("OPTIND", s, VNOFUNC);
490 s[0] = c;
491 s[1] = '\0';
492 err |= setvarsafe(optvar, s, 0);
493 if (err) {
494 *optnext = NULL;
495 *optpptr = NULL;
496 flushall();
497 exraise(EXERROR);
498 }
499 return done;
500 }
501
502 /*
503 * XXX - should get rid of. have all builtins use getopt(3). the
504 * library getopt must have the BSD extension static variable "optreset"
505 * otherwise it can't be used within the shell safely.
506 *
507 * Standard option processing (a la getopt) for builtin routines. The
508 * only argument that is passed to nextopt is the option string; the
509 * other arguments are unnecessary. It return the character, or '\0' on
510 * end of input.
511 */
512
513 int
nextopt(const char * optstring)514 nextopt(const char *optstring)
515 {
516 char *p;
517 const char *q;
518 char c;
519
520 if ((p = optptr) == NULL || *p == '\0') {
521 p = *argptr;
522 if (p == NULL || *p != '-' || *++p == '\0')
523 return '\0';
524 argptr++;
525 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
526 return '\0';
527 }
528 c = *p++;
529 for (q = optstring ; *q != c ; ) {
530 if (*q == '\0')
531 error("Illegal option -%c", c);
532 if (*++q == ':')
533 q++;
534 }
535 if (*++q == ':') {
536 if (*p == '\0' && (p = *argptr++) == NULL)
537 error("No arg for -%c option", c);
538 optionarg = p;
539 p = NULL;
540 }
541 optptr = p;
542 return c;
543 }
544