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1/* $OpenBSD: getopt_long.c,v 1.25 2011/03/05 22:10:11 guenther Exp $ */
2/* $NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $ */
3
4/*
5 * Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 *
19 * Sponsored in part by the Defense Advanced Research Projects
20 * Agency (DARPA) and Air Force Research Laboratory, Air Force
21 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
22 */
23/*-
24 * Copyright (c) 2000 The NetBSD Foundation, Inc.
25 * All rights reserved.
26 *
27 * This code is derived from software contributed to The NetBSD Foundation
28 * by Dieter Baron and Thomas Klausner.
29 *
30 * Redistribution and use in source and binary forms, with or without
31 * modification, are permitted provided that the following conditions
32 * are met:
33 * 1. Redistributions of source code must retain the above copyright
34 * notice, this list of conditions and the following disclaimer.
35 * 2. Redistributions in binary form must reproduce the above copyright
36 * notice, this list of conditions and the following disclaimer in the
37 * documentation and/or other materials provided with the distribution.
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
40 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
41 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
43 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
44 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
45 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
46 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
47 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
49 * POSSIBILITY OF SUCH DAMAGE.
50 */
51
52/* OPENBSD ORIGINAL: lib/libc/stdlib/getopt_long.c */
53#include "openbsd-compat.h"
54
55#if !defined(HAVE_GETOPT)
56
57#if 0
58#include <err.h>
59#include <getopt.h>
60#endif
61#include <errno.h>
62#include <stdlib.h>
63#include <string.h>
64#include <stdarg.h>
65
66int opterr = 1; /* if error message should be printed */
67int optind = 1; /* index into parent argv vector */
68int optopt = '?'; /* character checked for validity */
69int optreset; /* reset getopt */
70char *optarg; /* argument associated with option */
71
72#define PRINT_ERROR ((opterr) && (*options != ':'))
73
74#define FLAG_PERMUTE 0x01 /* permute non-options to the end of argv */
75#define FLAG_ALLARGS 0x02 /* treat non-options as args to option "-1" */
76#define FLAG_LONGONLY 0x04 /* operate as getopt_long_only */
77
78/* return values */
79#define BADCH (int)'?'
80#define BADARG ((*options == ':') ? (int)':' : (int)'?')
81#define INORDER (int)1
82
83#define EMSG ""
84
85static int getopt_internal(int, char * const *, const char *,
86 const struct option *, int *, int);
87static int parse_long_options(char * const *, const char *,
88 const struct option *, int *, int);
89static int gcd(int, int);
90static void permute_args(int, int, int, char * const *);
91
92static char *place = EMSG; /* option letter processing */
93
94/* XXX: set optreset to 1 rather than these two */
95static int nonopt_start = -1; /* first non option argument (for permute) */
96static int nonopt_end = -1; /* first option after non options (for permute) */
97
98/* Error messages */
99static const char recargchar[] = "option requires an argument -- %c";
100static const char recargstring[] = "option requires an argument -- %s";
101static const char ambig[] = "ambiguous option -- %.*s";
102static const char noarg[] = "option doesn't take an argument -- %.*s";
103static const char illoptchar[] = "unknown option -- %c";
104static const char illoptstring[] = "unknown option -- %s";
105
106/*
107 * Compute the greatest common divisor of a and b.
108 */
109static int
110gcd(int a, int b)
111{
112 int c;
113
114 c = a % b;
115 while (c != 0) {
116 a = b;
117 b = c;
118 c = a % b;
119 }
120
121 return (b);
122}
123
124/*
125 * Exchange the block from nonopt_start to nonopt_end with the block
126 * from nonopt_end to opt_end (keeping the same order of arguments
127 * in each block).
128 */
129static void
130permute_args(int panonopt_start, int panonopt_end, int opt_end,
131 char * const *nargv)
132{
133 int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
134 char *swap;
135
136 /*
137 * compute lengths of blocks and number and size of cycles
138 */
139 nnonopts = panonopt_end - panonopt_start;
140 nopts = opt_end - panonopt_end;
141 ncycle = gcd(nnonopts, nopts);
142 cyclelen = (opt_end - panonopt_start) / ncycle;
143
144 for (i = 0; i < ncycle; i++) {
145 cstart = panonopt_end+i;
146 pos = cstart;
147 for (j = 0; j < cyclelen; j++) {
148 if (pos >= panonopt_end)
149 pos -= nnonopts;
150 else
151 pos += nopts;
152 swap = nargv[pos];
153 /* LINTED const cast */
154 ((char **) nargv)[pos] = nargv[cstart];
155 /* LINTED const cast */
156 ((char **)nargv)[cstart] = swap;
157 }
158 }
159}
160
161/*
162 * parse_long_options --
163 * Parse long options in argc/argv argument vector.
164 * Returns -1 if short_too is set and the option does not match long_options.
165 */
166static int
167parse_long_options(char * const *nargv, const char *options,
168 const struct option *long_options, int *idx, int short_too)
169{
170 char *current_argv, *has_equal;
171 size_t current_argv_len;
172 int i, match;
173
174 current_argv = place;
175 match = -1;
176
177 optind++;
178
179 if ((has_equal = strchr(current_argv, '=')) != NULL) {
180 /* argument found (--option=arg) */
181 current_argv_len = has_equal - current_argv;
182 has_equal++;
183 } else
184 current_argv_len = strlen(current_argv);
185
186 for (i = 0; long_options[i].name; i++) {
187 /* find matching long option */
188 if (strncmp(current_argv, long_options[i].name,
189 current_argv_len))
190 continue;
191
192 if (strlen(long_options[i].name) == current_argv_len) {
193 /* exact match */
194 match = i;
195 break;
196 }
197 /*
198 * If this is a known short option, don't allow
199 * a partial match of a single character.
200 */
201 if (short_too && current_argv_len == 1)
202 continue;
203
204 if (match == -1) /* partial match */
205 match = i;
206 else {
207 /* ambiguous abbreviation */
208 if (PRINT_ERROR)
209 warnx(ambig, (int)current_argv_len,
210 current_argv);
211 optopt = 0;
212 return (BADCH);
213 }
214 }
215 if (match != -1) { /* option found */
216 if (long_options[match].has_arg == no_argument
217 && has_equal) {
218 if (PRINT_ERROR)
219 warnx(noarg, (int)current_argv_len,
220 current_argv);
221 /*
222 * XXX: GNU sets optopt to val regardless of flag
223 */
224 if (long_options[match].flag == NULL)
225 optopt = long_options[match].val;
226 else
227 optopt = 0;
228 return (BADARG);
229 }
230 if (long_options[match].has_arg == required_argument ||
231 long_options[match].has_arg == optional_argument) {
232 if (has_equal)
233 optarg = has_equal;
234 else if (long_options[match].has_arg ==
235 required_argument) {
236 /*
237 * optional argument doesn't use next nargv
238 */
239 optarg = nargv[optind++];
240 }
241 }
242 if ((long_options[match].has_arg == required_argument)
243 && (optarg == NULL)) {
244 /*
245 * Missing argument; leading ':' indicates no error
246 * should be generated.
247 */
248 if (PRINT_ERROR)
249 warnx(recargstring,
250 current_argv);
251 /*
252 * XXX: GNU sets optopt to val regardless of flag
253 */
254 if (long_options[match].flag == NULL)
255 optopt = long_options[match].val;
256 else
257 optopt = 0;
258 --optind;
259 return (BADARG);
260 }
261 } else { /* unknown option */
262 if (short_too) {
263 --optind;
264 return (-1);
265 }
266 if (PRINT_ERROR)
267 warnx(illoptstring, current_argv);
268 optopt = 0;
269 return (BADCH);
270 }
271 if (idx)
272 *idx = match;
273 if (long_options[match].flag) {
274 *long_options[match].flag = long_options[match].val;
275 return (0);
276 } else
277 return (long_options[match].val);
278}
279
280/*
281 * getopt_internal --
282 * Parse argc/argv argument vector. Called by user level routines.
283 */
284static int
285getopt_internal(int nargc, char * const *nargv, const char *options,
286 const struct option *long_options, int *idx, int flags)
287{
288 char *oli; /* option letter list index */
289 int optchar, short_too;
290 static int posixly_correct = -1;
291
292 if (options == NULL)
293 return (-1);
294
295 /*
296 * XXX Some GNU programs (like cvs) set optind to 0 instead of
297 * XXX using optreset. Work around this braindamage.
298 */
299 if (optind == 0)
300 optind = optreset = 1;
301
302 /*
303 * Disable GNU extensions if POSIXLY_CORRECT is set or options
304 * string begins with a '+'.
305 */
306 if (posixly_correct == -1 || optreset)
307 posixly_correct = (getenv("POSIXLY_CORRECT") != NULL);
308 if (*options == '-')
309 flags |= FLAG_ALLARGS;
310 else if (posixly_correct || *options == '+')
311 flags &= ~FLAG_PERMUTE;
312 if (*options == '+' || *options == '-')
313 options++;
314
315 optarg = NULL;
316 if (optreset)
317 nonopt_start = nonopt_end = -1;
318start:
319 if (optreset || !*place) { /* update scanning pointer */
320 optreset = 0;
321 if (optind >= nargc) { /* end of argument vector */
322 place = EMSG;
323 if (nonopt_end != -1) {
324 /* do permutation, if we have to */
325 permute_args(nonopt_start, nonopt_end,
326 optind, nargv);
327 optind -= nonopt_end - nonopt_start;
328 }
329 else if (nonopt_start != -1) {
330 /*
331 * If we skipped non-options, set optind
332 * to the first of them.
333 */
334 optind = nonopt_start;
335 }
336 nonopt_start = nonopt_end = -1;
337 return (-1);
338 }
339 if (*(place = nargv[optind]) != '-' ||
340 (place[1] == '\0' && strchr(options, '-') == NULL)) {
341 place = EMSG; /* found non-option */
342 if (flags & FLAG_ALLARGS) {
343 /*
344 * GNU extension:
345 * return non-option as argument to option 1
346 */
347 optarg = nargv[optind++];
348 return (INORDER);
349 }
350 if (!(flags & FLAG_PERMUTE)) {
351 /*
352 * If no permutation wanted, stop parsing
353 * at first non-option.
354 */
355 return (-1);
356 }
357 /* do permutation */
358 if (nonopt_start == -1)
359 nonopt_start = optind;
360 else if (nonopt_end != -1) {
361 permute_args(nonopt_start, nonopt_end,
362 optind, nargv);
363 nonopt_start = optind -
364 (nonopt_end - nonopt_start);
365 nonopt_end = -1;
366 }
367 optind++;
368 /* process next argument */
369 goto start;
370 }
371 if (nonopt_start != -1 && nonopt_end == -1)
372 nonopt_end = optind;
373
374 /*
375 * If we have "-" do nothing, if "--" we are done.
376 */
377 if (place[1] != '\0' && *++place == '-' && place[1] == '\0') {
378 optind++;
379 place = EMSG;
380 /*
381 * We found an option (--), so if we skipped
382 * non-options, we have to permute.
383 */
384 if (nonopt_end != -1) {
385 permute_args(nonopt_start, nonopt_end,
386 optind, nargv);
387 optind -= nonopt_end - nonopt_start;
388 }
389 nonopt_start = nonopt_end = -1;
390 return (-1);
391 }
392 }
393
394 /*
395 * Check long options if:
396 * 1) we were passed some
397 * 2) the arg is not just "-"
398 * 3) either the arg starts with -- we are getopt_long_only()
399 */
400 if (long_options != NULL && place != nargv[optind] &&
401 (*place == '-' || (flags & FLAG_LONGONLY))) {
402 short_too = 0;
403 if (*place == '-')
404 place++; /* --foo long option */
405 else if (*place != ':' && strchr(options, *place) != NULL)
406 short_too = 1; /* could be short option too */
407
408 optchar = parse_long_options(nargv, options, long_options,
409 idx, short_too);
410 if (optchar != -1) {
411 place = EMSG;
412 return (optchar);
413 }
414 }
415
416 if ((optchar = (int)*place++) == (int)':' ||
417 (optchar == (int)'-' && *place != '\0') ||
418 (oli = strchr(options, optchar)) == NULL) {
419 /*
420 * If the user specified "-" and '-' isn't listed in
421 * options, return -1 (non-option) as per POSIX.
422 * Otherwise, it is an unknown option character (or ':').
423 */
424 if (optchar == (int)'-' && *place == '\0')
425 return (-1);
426 if (!*place)
427 ++optind;
428 if (PRINT_ERROR)
429 warnx(illoptchar, optchar);
430 optopt = optchar;
431 return (BADCH);
432 }
433 if (long_options != NULL && optchar == 'W' && oli[1] == ';') {
434 /* -W long-option */
435 if (*place) /* no space */
436 /* NOTHING */;
437 else if (++optind >= nargc) { /* no arg */
438 place = EMSG;
439 if (PRINT_ERROR)
440 warnx(recargchar, optchar);
441 optopt = optchar;
442 return (BADARG);
443 } else /* white space */
444 place = nargv[optind];
445 optchar = parse_long_options(nargv, options, long_options,
446 idx, 0);
447 place = EMSG;
448 return (optchar);
449 }
450 if (*++oli != ':') { /* doesn't take argument */
451 if (!*place)
452 ++optind;
453 } else { /* takes (optional) argument */
454 optarg = NULL;
455 if (*place) /* no white space */
456 optarg = place;
457 else if (oli[1] != ':') { /* arg not optional */
458 if (++optind >= nargc) { /* no arg */
459 place = EMSG;
460 if (PRINT_ERROR)
461 warnx(recargchar, optchar);
462 optopt = optchar;
463 return (BADARG);
464 } else
465 optarg = nargv[optind];
466 }
467 place = EMSG;
468 ++optind;
469 }
470 /* dump back option letter */
471 return (optchar);
472}
473
474/*
475 * getopt --
476 * Parse argc/argv argument vector.
477 *
478 * [eventually this will replace the BSD getopt]
479 */
480int
481getopt(int nargc, char * const *nargv, const char *options)
482{
483
484 /*
485 * We don't pass FLAG_PERMUTE to getopt_internal() since
486 * the BSD getopt(3) (unlike GNU) has never done this.
487 *
488 * Furthermore, since many privileged programs call getopt()
489 * before dropping privileges it makes sense to keep things
490 * as simple (and bug-free) as possible.
491 */
492 return (getopt_internal(nargc, nargv, options, NULL, NULL, 0));
493}
494
495#if 0
496/*
497 * getopt_long --
498 * Parse argc/argv argument vector.
499 */
500int
501getopt_long(int nargc, char * const *nargv, const char *options,
502 const struct option *long_options, int *idx)
503{
504
505 return (getopt_internal(nargc, nargv, options, long_options, idx,
506 FLAG_PERMUTE));
507}
508
509/*
510 * getopt_long_only --
511 * Parse argc/argv argument vector.
512 */
513int
514getopt_long_only(int nargc, char * const *nargv, const char *options,
515 const struct option *long_options, int *idx)
516{
517
518 return (getopt_internal(nargc, nargv, options, long_options, idx,
519 FLAG_PERMUTE|FLAG_LONGONLY));
520}
521#endif
522
523#endif /* !defined(HAVE_GETOPT) */
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