options.c revision 1.47 1 /* $NetBSD: options.c,v 1.47 2017/05/15 20:00:36 kre 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 1.47 2017/05/15 20:00:36 kre 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
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 #ifndef DO_SHAREDVFORK
107 if (usefork == 2)
108 usefork = 1;
109 #endif
110 for (i = 0; i < NOPTS; i++)
111 if (optlist[i].val == 2)
112 optlist[i].val = 0;
113 #if DEBUG == 2
114 debug = 1;
115 #endif
116 arg0 = argv[0];
117 if (sflag == 0 && minusc == NULL) {
118 commandname = argv[0];
119 arg0 = *argptr++;
120 setinputfile(arg0, 0);
121 commandname = arg0;
122 }
123 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
124 if (minusc != NULL) {
125 if (argptr == NULL || *argptr == NULL)
126 error("Bad -c option");
127 minusc = *argptr++;
128 if (*argptr != 0)
129 arg0 = *argptr++;
130 }
131
132 shellparam.p = argptr;
133 shellparam.reset = 1;
134 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
135 while (*argptr) {
136 shellparam.nparam++;
137 argptr++;
138 }
139 optschanged();
140 }
141
142
143 void
144 optschanged(void)
145 {
146 setinteractive(iflag);
147 #ifndef SMALL
148 histedit();
149 #endif
150 setjobctl(mflag);
151 }
152
153 /*
154 * Process shell options. The global variable argptr contains a pointer
155 * to the argument list; we advance it past the options.
156 */
157
158 STATIC void
159 options(int cmdline)
160 {
161 static char empty[] = "";
162 char *p;
163 int val;
164 int c;
165
166 if (cmdline)
167 minusc = NULL;
168 while ((p = *argptr) != NULL) {
169 argptr++;
170 if ((c = *p++) == '-') {
171 val = 1;
172 if (p[0] == '\0' || (p[0] == '-' && p[1] == '\0')) {
173 if (!cmdline) {
174 /* "-" means turn off -x and -v */
175 if (p[0] == '\0')
176 xflag = vflag = 0;
177 /* "--" means reset params */
178 else if (*argptr == NULL)
179 setparam(argptr);
180 }
181 break; /* "-" or "--" terminates options */
182 }
183 } else if (c == '+') {
184 val = 0;
185 } else {
186 argptr--;
187 break;
188 }
189 while ((c = *p++) != '\0') {
190 if (c == 'c' && cmdline) {
191 /* command is after shell args*/
192 minusc = empty;
193 } else if (c == 'o') {
194 minus_o(*argptr, val);
195 if (*argptr)
196 argptr++;
197 #ifdef DEBUG
198 } else if (c == 'D') {
199 if (*p) {
200 set_debug(p, val);
201 break;
202 } else if (*argptr)
203 set_debug(*argptr++, val);
204 else
205 set_debug("*$", val);
206 #endif
207 } else {
208 setoption(c, val);
209 }
210 }
211 }
212 }
213
214 static void
215 set_opt_val(size_t i, int val)
216 {
217 size_t j;
218 int flag;
219
220 if (val && (flag = optlist[i].opt_set)) {
221 /* some options (eg vi/emacs) are mutually exclusive */
222 for (j = 0; j < NOPTS; j++)
223 if (optlist[j].opt_set == flag)
224 optlist[j].val = 0;
225 }
226 optlist[i].val = val;
227 #ifdef DEBUG
228 if (&optlist[i].val == &debug)
229 opentrace();
230 #endif
231 }
232
233 STATIC void
234 minus_o(char *name, int val)
235 {
236 size_t i;
237 const char *sep = ": ";
238
239 if (name == NULL) {
240 if (val) {
241 out1str("Current option settings");
242 for (i = 0; i < NOPTS; i++) {
243 if (optlist[i].name == NULL) {
244 out1fmt("%s%c%c", sep,
245 "+-"[optlist[i].val],
246 optlist[i].letter);
247 sep = ", ";
248 }
249 }
250 out1c('\n');
251 for (i = 0; i < NOPTS; i++) {
252 if (optlist[i].name)
253 out1fmt("%-16s%s\n", optlist[i].name,
254 optlist[i].val ? "on" : "off");
255 }
256 } else {
257 out1str("set");
258 for (i = 0; i < NOPTS; i++) {
259 if (optlist[i].name)
260 out1fmt(" %co %s",
261 "+-"[optlist[i].val], optlist[i].name);
262 else
263 out1fmt(" %c%c", "+-"[optlist[i].val],
264 optlist[i].letter);
265 }
266 out1c('\n');
267 }
268 } else {
269 for (i = 0; i < NOPTS; i++)
270 if (optlist[i].name && equal(name, optlist[i].name)) {
271 set_opt_val(i, val);
272 return;
273 }
274 error("Illegal option -o %s", name);
275 }
276 }
277
278
279 STATIC void
280 setoption(int flag, int val)
281 {
282 size_t i;
283
284 for (i = 0; i < NOPTS; i++)
285 if (optlist[i].letter == flag) {
286 set_opt_val( i, val );
287 return;
288 }
289 error("Illegal option -%c", flag);
290 /* NOTREACHED */
291 }
292
293
294
295 #ifdef mkinit
296 INCLUDE "options.h"
297
298 SHELLPROC {
299 int i;
300
301 for (i = 0; optlist[i].name; i++)
302 optlist[i].val = 0;
303 optschanged();
304
305 }
306 #endif
307
308
309 /*
310 * Set the shell parameters.
311 */
312
313 void
314 setparam(char **argv)
315 {
316 char **newparam;
317 char **ap;
318 int nparam;
319
320 for (nparam = 0 ; argv[nparam] ; nparam++)
321 continue;
322 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
323 while (*argv) {
324 *ap++ = savestr(*argv++);
325 }
326 *ap = NULL;
327 freeparam(&shellparam);
328 shellparam.malloc = 1;
329 shellparam.nparam = nparam;
330 shellparam.p = newparam;
331 shellparam.optnext = NULL;
332 }
333
334
335 /*
336 * Free the list of positional parameters.
337 */
338
339 void
340 freeparam(volatile struct shparam *param)
341 {
342 char **ap;
343
344 if (param->malloc) {
345 for (ap = param->p ; *ap ; ap++)
346 ckfree(*ap);
347 ckfree(param->p);
348 }
349 }
350
351
352
353 /*
354 * The shift builtin command.
355 */
356
357 int
358 shiftcmd(int argc, char **argv)
359 {
360 int n;
361 char **ap1, **ap2;
362
363 if (argc > 2)
364 error("Usage: shift [n]");
365 n = 1;
366 if (argc > 1)
367 n = number(argv[1]);
368 if (n > shellparam.nparam)
369 error("can't shift that many");
370 INTOFF;
371 shellparam.nparam -= n;
372 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
373 if (shellparam.malloc)
374 ckfree(*ap1);
375 }
376 ap2 = shellparam.p;
377 while ((*ap2++ = *ap1++) != NULL)
378 continue;
379 shellparam.optnext = NULL;
380 INTON;
381 return 0;
382 }
383
384
385
386 /*
387 * The set command builtin.
388 */
389
390 int
391 setcmd(int argc, char **argv)
392 {
393 if (argc == 1)
394 return showvars(0, 0, 1, 0);
395 INTOFF;
396 options(0);
397 optschanged();
398 if (*argptr != NULL) {
399 setparam(argptr);
400 }
401 INTON;
402 return 0;
403 }
404
405
406 void
407 getoptsreset(const char *value)
408 {
409 if (number(value) == 1) {
410 shellparam.optnext = NULL;
411 shellparam.reset = 1;
412 }
413 }
414
415 /*
416 * The getopts builtin. Shellparam.optnext points to the next argument
417 * to be processed. Shellparam.optptr points to the next character to
418 * be processed in the current argument. If shellparam.optnext is NULL,
419 * then it's the first time getopts has been called.
420 */
421
422 int
423 getoptscmd(int argc, char **argv)
424 {
425 char **optbase;
426
427 if (argc < 3)
428 error("usage: getopts optstring var [arg]");
429 else if (argc == 3)
430 optbase = shellparam.p;
431 else
432 optbase = &argv[3];
433
434 if (shellparam.reset == 1) {
435 shellparam.optnext = optbase;
436 shellparam.optptr = NULL;
437 shellparam.reset = 0;
438 }
439
440 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
441 &shellparam.optptr);
442 }
443
444 STATIC int
445 getopts(char *optstr, char *optvar, char **optfirst, char ***optnext, char **optpptr)
446 {
447 char *p, *q;
448 char c = '?';
449 int done = 0;
450 int ind = 0;
451 int err = 0;
452 char s[12];
453
454 if ((p = *optpptr) == NULL || *p == '\0') {
455 /* Current word is done, advance */
456 if (*optnext == NULL)
457 return 1;
458 p = **optnext;
459 if (p == NULL || *p != '-' || *++p == '\0') {
460 atend:
461 ind = *optnext - optfirst + 1;
462 *optnext = NULL;
463 p = NULL;
464 done = 1;
465 goto out;
466 }
467 (*optnext)++;
468 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
469 goto atend;
470 }
471
472 c = *p++;
473 for (q = optstr; *q != c; ) {
474 if (*q == '\0') {
475 if (optstr[0] == ':') {
476 s[0] = c;
477 s[1] = '\0';
478 err |= setvarsafe("OPTARG", s, 0);
479 } else {
480 outfmt(&errout, "Illegal option -%c\n", c);
481 (void) unsetvar("OPTARG", 0);
482 }
483 c = '?';
484 goto bad;
485 }
486 if (*++q == ':')
487 q++;
488 }
489
490 if (*++q == ':') {
491 if (*p == '\0' && (p = **optnext) == NULL) {
492 if (optstr[0] == ':') {
493 s[0] = c;
494 s[1] = '\0';
495 err |= setvarsafe("OPTARG", s, 0);
496 c = ':';
497 } else {
498 outfmt(&errout, "No arg for -%c option\n", c);
499 (void) unsetvar("OPTARG", 0);
500 c = '?';
501 }
502 goto bad;
503 }
504
505 if (p == **optnext)
506 (*optnext)++;
507 err |= setvarsafe("OPTARG", p, 0);
508 p = NULL;
509 } else
510 err |= setvarsafe("OPTARG", "", 0);
511 ind = *optnext - optfirst + 1;
512 goto out;
513
514 bad:
515 ind = 1;
516 *optnext = NULL;
517 p = NULL;
518 out:
519 *optpptr = p;
520 fmtstr(s, sizeof(s), "%d", ind);
521 err |= setvarsafe("OPTIND", s, VNOFUNC);
522 s[0] = c;
523 s[1] = '\0';
524 err |= setvarsafe(optvar, s, 0);
525 if (err) {
526 *optnext = NULL;
527 *optpptr = NULL;
528 flushall();
529 exraise(EXERROR);
530 }
531 return done;
532 }
533
534 /*
535 * XXX - should get rid of. have all builtins use getopt(3). the
536 * library getopt must have the BSD extension static variable "optreset"
537 * otherwise it can't be used within the shell safely.
538 *
539 * Standard option processing (a la getopt) for builtin routines. The
540 * only argument that is passed to nextopt is the option string; the
541 * other arguments are unnecessary. It return the character, or '\0' on
542 * end of input.
543 */
544
545 int
546 nextopt(const char *optstring)
547 {
548 char *p;
549 const char *q;
550 char c;
551
552 if ((p = optptr) == NULL || *p == '\0') {
553 p = *argptr;
554 if (p == NULL || *p != '-' || *++p == '\0')
555 return '\0';
556 argptr++;
557 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
558 return '\0';
559 }
560 c = *p++;
561 for (q = optstring ; *q != c ; ) {
562 if (*q == '\0')
563 error("Illegal option -%c", c);
564 if (*++q == ':')
565 q++;
566 }
567 if (*++q == ':') {
568 if (*p == '\0' && (p = *argptr++) == NULL)
569 error("No arg for -%c option", c);
570 optionarg = p;
571 p = NULL;
572 }
573 optptr = p;
574 return c;
575 }
576