sh: Fix duplicate prototypes for builtins.
[dragonfly.git] / bin / sh / options.c
CommitLineData
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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.
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35 *
36 * @(#)options.c 8.2 (Berkeley) 5/4/95
c3e3bc7a 37 * $FreeBSD: src/bin/sh/options.c,v 1.37 2011/06/13 21:03:27 jilles Exp $
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38 */
39
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40#include <signal.h>
41#include <unistd.h>
42#include <stdlib.h>
43
44#include "shell.h"
45#define DEFINE_OPTIONS
46#include "options.h"
47#undef DEFINE_OPTIONS
48#include "nodes.h" /* for other header files */
49#include "eval.h"
50#include "jobs.h"
51#include "input.h"
52#include "output.h"
53#include "trap.h"
54#include "var.h"
55#include "memalloc.h"
56#include "error.h"
57#include "mystring.h"
c3e3bc7a 58#include "builtins.h"
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59#ifndef NO_HISTORY
60#include "myhistedit.h"
61#endif
62
63char *arg0; /* value of $0 */
64struct shparam shellparam; /* current positional parameters */
65char **argptr; /* argument list for builtin commands */
492efe05 66const char *shoptarg; /* set by nextopt (like getopt) */
99512ac4 67char *nextopt_optptr; /* used by nextopt */
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68
69char *minusc; /* argument to -c option */
70
71
99512ac4
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72static void options(int);
73static void minus_o(char *, int);
74static void setoption(int, int);
75static int getopts(char *, char *, char **, char ***, char **);
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76
77
78/*
79 * Process the shell command line arguments.
80 */
81
82void
83procargs(int argc, char **argv)
84{
85 int i;
84021a35 86 char *scriptname;
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87
88 argptr = argv;
89 if (argc > 0)
90 argptr++;
91 for (i = 0; i < NOPTS; i++)
92 optlist[i].val = 2;
93 privileged = (getuid() != geteuid() || getgid() != getegid());
94 options(1);
95 if (*argptr == NULL && minusc == NULL)
96 sflag = 1;
99512ac4 97 if (iflag != 0 && sflag == 1 && isatty(0) && isatty(1)) {
984263bc 98 iflag = 1;
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99 if (Eflag == 2)
100 Eflag = 1;
101 }
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102 if (mflag == 2)
103 mflag = iflag;
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104 /* turn on tabcomplete in an interactive shell by default */
105 tabcomplete = iflag;
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106 for (i = 0; i < NOPTS; i++)
107 if (optlist[i].val == 2)
108 optlist[i].val = 0;
109 arg0 = argv[0];
110 if (sflag == 0 && minusc == NULL) {
84021a35
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111 scriptname = *argptr++;
112 setinputfile(scriptname, 0);
113 commandname = arg0 = scriptname;
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114 }
115 /* POSIX 1003.2: first arg after -c cmd is $0, remainder $1... */
116 if (argptr && minusc && *argptr)
117 arg0 = *argptr++;
118
119 shellparam.p = argptr;
120 shellparam.reset = 1;
121 /* assert(shellparam.malloc == 0 && shellparam.nparam == 0); */
122 while (*argptr) {
123 shellparam.nparam++;
124 argptr++;
125 }
126 optschanged();
127}
128
129
130void
131optschanged(void)
132{
133 setinteractive(iflag);
134#ifndef NO_HISTORY
135 histedit();
136#endif
137 setjobctl(mflag);
138}
139
140/*
141 * Process shell options. The global variable argptr contains a pointer
142 * to the argument list; we advance it past the options.
143 */
144
99512ac4 145static void
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146options(int cmdline)
147{
67560595 148 char *kp, *p;
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149 int val;
150 int c;
151
152 if (cmdline)
153 minusc = NULL;
154 while ((p = *argptr) != NULL) {
155 argptr++;
156 if ((c = *p++) == '-') {
157 val = 1;
67560595
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158 /* A "-" or "--" terminates options */
159 if (p[0] == '\0')
160 goto end_options1;
161 if (p[0] == '-' && p[1] == '\0')
162 goto end_options2;
163 /**
164 * For the benefit of `#!' lines in shell scripts,
165 * treat a string of '-- *#.*' the same as '--'.
166 * This is needed so that a script starting with:
167 * #!/bin/sh -- # -*- perl -*-
168 * will continue to work after a change is made to
169 * kern/imgact_shell.c to NOT token-ize the options
170 * specified on a '#!' line. A bit of a kludge,
171 * but that trick is recommended in documentation
172 * for some scripting languages, and we might as
173 * well continue to support it.
174 */
175 if (p[0] == '-') {
176 kp = p + 1;
177 while (*kp == ' ' || *kp == '\t')
178 kp++;
179 if (*kp == '#' || *kp == '\0')
180 goto end_options2;
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181 }
182 } else if (c == '+') {
183 val = 0;
184 } else {
185 argptr--;
186 break;
187 }
188 while ((c = *p++) != '\0') {
189 if (c == 'c' && cmdline) {
190 char *q;
191#ifdef NOHACK /* removing this code allows sh -ce 'foo' for compat */
192 if (*p == '\0')
193#endif
194 q = *argptr++;
195 if (q == NULL || minusc != NULL)
196 error("Bad -c option");
197 minusc = q;
198#ifdef NOHACK
199 break;
200#endif
201 } else if (c == 'o') {
202 minus_o(*argptr, val);
203 if (*argptr)
204 argptr++;
1bf98173 205 } else
984263bc 206 setoption(c, val);
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207 }
208 }
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209 return;
210
211 /* When processing `set', a single "-" means turn off -x and -v */
212end_options1:
213 if (!cmdline) {
214 xflag = vflag = 0;
215 return;
216 }
217
218 /*
219 * When processing `set', a "--" means the remaining arguments
220 * replace the positional parameters in the active shell. If
221 * there are no remaining options, then all the positional
222 * parameters are cleared (equivalent to doing ``shift $#'').
223 */
224end_options2:
225 if (!cmdline) {
226 if (*argptr == NULL)
227 setparam(argptr);
228 return;
229 }
230
231 /*
232 * At this point we are processing options given to 'sh' on a command
233 * line. If an end-of-options marker ("-" or "--") is followed by an
234 * arg of "#", then skip over all remaining arguments. Some scripting
235 * languages (e.g.: perl) document that /bin/sh will implement this
236 * behavior, and they recommend that users take advantage of it to
237 * solve certain issues that can come up when writing a perl script.
238 * Yes, this feature is in /bin/sh to help users write perl scripts.
239 */
240 p = *argptr;
241 if (p != NULL && p[0] == '#' && p[1] == '\0') {
242 while (*argptr != NULL)
243 argptr++;
244 /* We need to keep the final argument */
245 argptr--;
246 }
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247}
248
99512ac4 249static void
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250minus_o(char *name, int val)
251{
67560595 252 int i;
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253
254 if (name == NULL) {
255 if (val) {
256 /* "Pretty" output. */
257 out1str("Current option settings\n");
258 for (i = 0; i < NOPTS; i++)
259 out1fmt("%-16s%s\n", optlist[i].name,
260 optlist[i].val ? "on" : "off");
261 } else {
262 /* Output suitable for re-input to shell. */
99512ac4
PA
263 for (i = 0; i < NOPTS; i++)
264 out1fmt("%s %co %s%s",
265 i % 6 == 0 ? "set" : "",
266 optlist[i].val ? '-' : '+',
267 optlist[i].name,
268 i % 6 == 5 || i == NOPTS - 1 ? "\n" : "");
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269 }
270 } else {
271 for (i = 0; i < NOPTS; i++)
272 if (equal(name, optlist[i].name)) {
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273 setoption(optlist[i].letter, val);
274 return;
275 }
276 error("Illegal option -o %s", name);
277 }
278}
279
280
99512ac4 281static void
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282setoption(int flag, int val)
283{
284 int i;
285
1bf98173
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286 if (flag == 'p' && !val && privileged) {
287 if (setgid(getgid()) == -1)
288 error("setgid");
289 if (setuid(getuid()) == -1)
290 error("setuid");
291 }
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292 for (i = 0; i < NOPTS; i++)
293 if (optlist[i].letter == flag) {
294 optlist[i].val = val;
295 if (val) {
296 /* #%$ hack for ksh semantics */
297 if (flag == 'V')
298 Eflag = 0;
299 else if (flag == 'E')
300 Vflag = 0;
301 }
302 return;
303 }
304 error("Illegal option -%c", flag);
305}
306
307
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308/*
309 * Set the shell parameters.
310 */
311
312void
313setparam(char **argv)
314{
315 char **newparam;
316 char **ap;
317 int nparam;
318
319 for (nparam = 0 ; argv[nparam] ; nparam++);
320 ap = newparam = ckmalloc((nparam + 1) * sizeof *ap);
321 while (*argv) {
322 *ap++ = savestr(*argv++);
323 }
324 *ap = NULL;
325 freeparam(&shellparam);
326 shellparam.malloc = 1;
327 shellparam.nparam = nparam;
328 shellparam.p = newparam;
99512ac4 329 shellparam.reset = 1;
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330 shellparam.optnext = NULL;
331}
332
333
334/*
335 * Free the list of positional parameters.
336 */
337
338void
934863d7 339freeparam(volatile struct shparam *param)
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340{
341 char **ap;
342
343 if (param->malloc) {
344 for (ap = param->p ; *ap ; ap++)
345 ckfree(*ap);
346 ckfree(param->p);
347 }
348}
349
350
351
352/*
353 * The shift builtin command.
354 */
355
356int
357shiftcmd(int argc, char **argv)
358{
359 int n;
360 char **ap1, **ap2;
361
362 n = 1;
363 if (argc > 1)
364 n = number(argv[1]);
365 if (n > shellparam.nparam)
0d5aaed6 366 return 1;
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367 INTOFF;
368 shellparam.nparam -= n;
369 for (ap1 = shellparam.p ; --n >= 0 ; ap1++) {
370 if (shellparam.malloc)
371 ckfree(*ap1);
372 }
373 ap2 = shellparam.p;
374 while ((*ap2++ = *ap1++) != NULL);
99512ac4 375 shellparam.reset = 1;
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376 INTON;
377 return 0;
378}
379
380
381
382/*
383 * The set command builtin.
384 */
385
386int
387setcmd(int argc, char **argv)
388{
389 if (argc == 1)
390 return showvarscmd(argc, argv);
391 INTOFF;
392 options(0);
393 optschanged();
394 if (*argptr != NULL) {
395 setparam(argptr);
396 }
397 INTON;
398 return 0;
399}
400
401
402void
403getoptsreset(const char *value)
404{
405 if (number(value) == 1) {
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406 shellparam.reset = 1;
407 }
408}
409
410/*
411 * The getopts builtin. Shellparam.optnext points to the next argument
412 * to be processed. Shellparam.optptr points to the next character to
413 * be processed in the current argument. If shellparam.optnext is NULL,
414 * then it's the first time getopts has been called.
415 */
416
417int
418getoptscmd(int argc, char **argv)
419{
420 char **optbase = NULL;
421
422 if (argc < 3)
423 error("usage: getopts optstring var [arg]");
424 else if (argc == 3)
425 optbase = shellparam.p;
426 else
427 optbase = &argv[3];
428
429 if (shellparam.reset == 1) {
430 shellparam.optnext = optbase;
431 shellparam.optptr = NULL;
432 shellparam.reset = 0;
433 }
434
435 return getopts(argv[1], argv[2], optbase, &shellparam.optnext,
436 &shellparam.optptr);
437}
438
99512ac4 439static int
984263bc 440getopts(char *optstr, char *optvar, char **optfirst, char ***optnext,
934863d7 441 char **optp)
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442{
443 char *p, *q;
444 char c = '?';
445 int done = 0;
446 int ind = 0;
447 int err = 0;
448 char s[10];
449
934863d7 450 if ((p = *optp) == NULL || *p == '\0') {
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451 /* Current word is done, advance */
452 if (*optnext == NULL)
453 return 1;
454 p = **optnext;
455 if (p == NULL || *p != '-' || *++p == '\0') {
456atend:
457 ind = *optnext - optfirst + 1;
458 *optnext = NULL;
459 p = NULL;
460 done = 1;
461 goto out;
462 }
463 (*optnext)++;
464 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
465 goto atend;
466 }
467
468 c = *p++;
469 for (q = optstr; *q != c; ) {
470 if (*q == '\0') {
471 if (optstr[0] == ':') {
472 s[0] = c;
473 s[1] = '\0';
474 err |= setvarsafe("OPTARG", s, 0);
475 }
476 else {
477 out1fmt("Illegal option -%c\n", c);
57fed2af 478 unsetvar("OPTARG");
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479 }
480 c = '?';
481 goto bad;
482 }
483 if (*++q == ':')
484 q++;
485 }
486
487 if (*++q == ':') {
488 if (*p == '\0' && (p = **optnext) == NULL) {
489 if (optstr[0] == ':') {
490 s[0] = c;
491 s[1] = '\0';
492 err |= setvarsafe("OPTARG", s, 0);
493 c = ':';
494 }
495 else {
496 out1fmt("No arg for -%c option\n", c);
57fed2af 497 unsetvar("OPTARG");
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498 c = '?';
499 }
500 goto bad;
501 }
502
503 if (p == **optnext)
504 (*optnext)++;
505 setvarsafe("OPTARG", p, 0);
506 p = NULL;
507 }
508 else
509 setvarsafe("OPTARG", "", 0);
510 ind = *optnext - optfirst + 1;
511 goto out;
512
513bad:
514 ind = 1;
515 *optnext = NULL;
516 p = NULL;
517out:
934863d7 518 *optp = p;
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519 fmtstr(s, sizeof(s), "%d", ind);
520 err |= setvarsafe("OPTIND", s, VNOFUNC);
521 s[0] = c;
522 s[1] = '\0';
523 err |= setvarsafe(optvar, s, 0);
524 if (err) {
525 *optnext = NULL;
934863d7 526 *optp = NULL;
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527 flushall();
528 exraise(EXERROR);
529 }
530 return done;
531}
532
533/*
534 * XXX - should get rid of. have all builtins use getopt(3). the
535 * library getopt must have the BSD extension static variable "optreset"
536 * otherwise it can't be used within the shell safely.
537 *
538 * Standard option processing (a la getopt) for builtin routines. The
539 * only argument that is passed to nextopt is the option string; the
540 * other arguments are unnecessary. It return the character, or '\0' on
541 * end of input.
542 */
543
544int
492efe05 545nextopt(const char *optstring)
984263bc 546{
99512ac4
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547 char *p;
548 const char *q;
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549 char c;
550
99512ac4 551 if ((p = nextopt_optptr) == NULL || *p == '\0') {
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552 p = *argptr;
553 if (p == NULL || *p != '-' || *++p == '\0')
554 return '\0';
555 argptr++;
556 if (p[0] == '-' && p[1] == '\0') /* check for "--" */
557 return '\0';
558 }
559 c = *p++;
560 for (q = optstring ; *q != c ; ) {
561 if (*q == '\0')
562 error("Illegal option -%c", c);
563 if (*++q == ':')
564 q++;
565 }
566 if (*++q == ':') {
567 if (*p == '\0' && (p = *argptr++) == NULL)
568 error("No arg for -%c option", c);
569 shoptarg = p;
570 p = NULL;
571 }
99512ac4 572 nextopt_optptr = p;
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573 return c;
574}