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getopt.c
1 /* Getopt for GNU.
2 NOTE: getopt is now part of the C library, so if you don't know what
3 "Keep this file name-space clean" means, talk to drepper@gnu.org
4 before changing it!
5 Copyright (C) 1987,88,89,90,91,92,93,94,95,96,98,99,2000,2001
6 Free Software Foundation, Inc.
7 This file is part of the GNU C Library.
8
9 The GNU C Library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2.1 of the License, or (at your option) any later version.
13
14 The GNU C Library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
18
19 You should have received a copy of the GNU Lesser General Public
20 License along with the GNU C Library; if not, write to the Free
21 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
22 02111-1307 USA. */
23
24 /* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.
25 Ditto for AIX 3.2 and <stdlib.h>. */
26 #ifndef _NO_PROTO
27 # define _NO_PROTO
28 #endif
29
30 #ifdef HAVE_CONFIG_H
31 # include <config.h>
32 #endif
33
34 #if !defined __STDC__ || !__STDC__
35 /* This is a separate conditional since some stdc systems
36 reject `defined (const)'. */
37 # ifndef const
38 # define const
39 # endif
40 #endif
41
42 #include <stdio.h>
43
44 /* Comment out all this code if we are using the GNU C Library, and are not
45 actually compiling the library itself. This code is part of the GNU C
46 Library, but also included in many other GNU distributions. Compiling
47 and linking in this code is a waste when using the GNU C library
48 (especially if it is a shared library). Rather than having every GNU
49 program understand `configure --with-gnu-libc' and omit the object files,
50 it is simpler to just do this in the source for each such file. */
51
52 #define GETOPT_INTERFACE_VERSION 2
53 #if !defined _LIBC && defined __GLIBC__ && __GLIBC__ >= 2
54 # include <gnu-versions.h>
55 # if _GNU_GETOPT_INTERFACE_VERSION == GETOPT_INTERFACE_VERSION
56 # define ELIDE_CODE
57 # endif
58 #endif
59
60 #ifndef ELIDE_CODE
61
62
63 /* This needs to come after some library #include
64 to get __GNU_LIBRARY__ defined. */
65 #ifdef __GNU_LIBRARY__
66 /* Don't include stdlib.h for non-GNU C libraries because some of them
67 contain conflicting prototypes for getopt. */
68 # include <stdlib.h>
69 # include <unistd.h>
70 #endif /* GNU C library. */
71
72 #ifdef VMS
73 # include <unixlib.h>
74 # if HAVE_STRING_H - 0
75 # include <string.h>
76 # endif
77 #endif
78
79 #ifndef _
80 /* This is for other GNU distributions with internationalized messages. */
81 # if defined HAVE_LIBINTL_H || defined _LIBC
82 # include <libintl.h>
83 # ifndef _
84 # define _(msgid) gettext (msgid)
85 # endif
86 # else
87 # define _(msgid) (msgid)
88 # endif
89 #endif
90
91 /* This version of `getopt' appears to the caller like standard Unix `getopt'
92 but it behaves differently for the user, since it allows the user
93 to intersperse the options with the other arguments.
94
95 As `getopt' works, it permutes the elements of ARGV so that,
96 when it is done, all the options precede everything else. Thus
97 all application programs are extended to handle flexible argument order.
98
99 Setting the environment variable POSIXLY_CORRECT disables permutation.
100 Then the behavior is completely standard.
101
102 GNU application programs can use a third alternative mode in which
103 they can distinguish the relative order of options and other arguments. */
104
105 #include "getopt.h"
106
107 /* For communication from `getopt' to the caller.
108 When `getopt' finds an option that takes an argument,
109 the argument value is returned here.
110 Also, when `ordering' is RETURN_IN_ORDER,
111 each non-option ARGV-element is returned here. */
112
113 char *optarg;
114
115 /* Index in ARGV of the next element to be scanned.
116 This is used for communication to and from the caller
117 and for communication between successive calls to `getopt'.
118
119 On entry to `getopt', zero means this is the first call; initialize.
120
121 When `getopt' returns -1, this is the index of the first of the
122 non-option elements that the caller should itself scan.
123
124 Otherwise, `optind' communicates from one call to the next
125 how much of ARGV has been scanned so far. */
126
127 /* 1003.2 says this must be 1 before any call. */
128 int optind = 1;
129
130 /* Formerly, initialization of getopt depended on optind==0, which
131 causes problems with re-calling getopt as programs generally don't
132 know that. */
133
134 int __getopt_initialized;
135
136 /* The next char to be scanned in the option-element
137 in which the last option character we returned was found.
138 This allows us to pick up the scan where we left off.
139
140 If this is zero, or a null string, it means resume the scan
141 by advancing to the next ARGV-element. */
142
143 static char *nextchar;
144
145 /* Callers store zero here to inhibit the error message
146 for unrecognized options. */
147
148 int opterr = 1;
149
150 /* Set to an option character which was unrecognized.
151 This must be initialized on some systems to avoid linking in the
152 system's own getopt implementation. */
153
154 int optopt = '?';
155
156 /* Describe how to deal with options that follow non-option ARGV-elements.
157
158 If the caller did not specify anything,
159 the default is REQUIRE_ORDER if the environment variable
160 POSIXLY_CORRECT is defined, PERMUTE otherwise.
161
162 REQUIRE_ORDER means don't recognize them as options;
163 stop option processing when the first non-option is seen.
164 This is what Unix does.
165 This mode of operation is selected by either setting the environment
166 variable POSIXLY_CORRECT, or using `+' as the first character
167 of the list of option characters.
168
169 PERMUTE is the default. We permute the contents of ARGV as we scan,
170 so that eventually all the non-options are at the end. This allows options
171 to be given in any order, even with programs that were not written to
172 expect this.
173
174 RETURN_IN_ORDER is an option available to programs that were written
175 to expect options and other ARGV-elements in any order and that care about
176 the ordering of the two. We describe each non-option ARGV-element
177 as if it were the argument of an option with character code 1.
178 Using `-' as the first character of the list of option characters
179 selects this mode of operation.
180
181 The special argument `--' forces an end of option-scanning regardless
182 of the value of `ordering'. In the case of RETURN_IN_ORDER, only
183 `--' can cause `getopt' to return -1 with `optind' != ARGC. */
184
185 static enum
186 {
187 REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
188 } ordering;
189
190 /* Value of POSIXLY_CORRECT environment variable. */
191 static char *posixly_correct;
192
193 #ifdef __GNU_LIBRARY__
194 /* We want to avoid inclusion of string.h with non-GNU libraries
195 because there are many ways it can cause trouble.
196 On some systems, it contains special magic macros that don't work
197 in GCC. */
198 # include <string.h>
199 # define my_index strchr
200 #else
201
202 # if HAVE_STRING_H
203 # include <string.h>
204 # else
205 # include <strings.h>
206 # endif
207
208 /* Avoid depending on library functions or files
209 whose names are inconsistent. */
210
211 #ifndef getenv
212 extern char *getenv ();
213 #endif
214
215 static char *
216 my_index (str, chr)
217 const char *str;
218 int chr;
219 {
220 while (*str)
221 {
222 if (*str == chr)
223 return (char *) str;
224 str++;
225 }
226 return 0;
227 }
228
229 /* If using GCC, we can safely declare strlen this way.
230 If not using GCC, it is ok not to declare it. */
231 #ifdef __GNUC__
232 /* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
233 That was relevant to code that was here before. */
234 # if (!defined __STDC__ || !__STDC__) && !defined strlen
235 /* gcc with -traditional declares the built-in strlen to return int,
236 and has done so at least since version 2.4.5. -- rms. */
237 extern int strlen (const char *);
238 # endif /* not __STDC__ */
239 #endif /* __GNUC__ */
240
241 #endif /* not __GNU_LIBRARY__ */
242
243 /* Handle permutation of arguments. */
244
245 /* Describe the part of ARGV that contains non-options that have
246 been skipped. `first_nonopt' is the index in ARGV of the first of them;
247 `last_nonopt' is the index after the last of them. */
248
249 static int first_nonopt;
250 static int last_nonopt;
251
252 #ifdef _LIBC
253 /* Stored original parameters.
254 XXX This is no good solution. We should rather copy the args so
255 that we can compare them later. But we must not use malloc(3). */
256 extern int __libc_argc;
257 extern char **__libc_argv;
258
259 /* Bash 2.0 gives us an environment variable containing flags
260 indicating ARGV elements that should not be considered arguments. */
261
262 # ifdef USE_NONOPTION_FLAGS
263 /* Defined in getopt_init.c */
264 extern char *__getopt_nonoption_flags;
265
266 static int nonoption_flags_max_len;
267 static int nonoption_flags_len;
268 # endif
269
270 # ifdef USE_NONOPTION_FLAGS
271 # define SWAP_FLAGS(ch1, ch2) \
272 if (nonoption_flags_len > 0) \
273 { \
274 char __tmp = __getopt_nonoption_flags[ch1]; \
275 __getopt_nonoption_flags[ch1] = __getopt_nonoption_flags[ch2]; \
276 __getopt_nonoption_flags[ch2] = __tmp; \
277 }
278 # else
279 # define SWAP_FLAGS(ch1, ch2)
280 # endif
281 #else /* !_LIBC */
282 # define SWAP_FLAGS(ch1, ch2)
283 #endif /* _LIBC */
284
285 /* Exchange two adjacent subsequences of ARGV.
286 One subsequence is elements [first_nonopt,last_nonopt)
287 which contains all the non-options that have been skipped so far.
288 The other is elements [last_nonopt,optind), which contains all
289 the options processed since those non-options were skipped.
290
291 `first_nonopt' and `last_nonopt' are relocated so that they describe
292 the new indices of the non-options in ARGV after they are moved. */
293
294 #if defined __STDC__ && __STDC__
295 static void exchange (char **);
296 #endif
297
298 static void
299 exchange (argv)
300 char **argv;
301 {
302 int bottom = first_nonopt;
303 int middle = last_nonopt;
304 int top = optind;
305 char *tem;
306
307 /* Exchange the shorter segment with the far end of the longer segment.
308 That puts the shorter segment into the right place.
309 It leaves the longer segment in the right place overall,
310 but it consists of two parts that need to be swapped next. */
311
312 #if defined _LIBC && defined USE_NONOPTION_FLAGS
313 /* First make sure the handling of the `__getopt_nonoption_flags'
314 string can work normally. Our top argument must be in the range
315 of the string. */
316 if (nonoption_flags_len > 0 && top >= nonoption_flags_max_len)
317 {
318 /* We must extend the array. The user plays games with us and
319 presents new arguments. */
320 char *new_str = malloc (top + 1);
321 if (new_str == NULL)
322 nonoption_flags_len = nonoption_flags_max_len = 0;
323 else
324 {
325 memset (__mempcpy (new_str, __getopt_nonoption_flags,
326 nonoption_flags_max_len),
327 '\0', top + 1 - nonoption_flags_max_len);
328 nonoption_flags_max_len = top + 1;
329 __getopt_nonoption_flags = new_str;
330 }
331 }
332 #endif
333
334 while (top > middle && middle > bottom)
335 {
336 if (top - middle > middle - bottom)
337 {
338 /* Bottom segment is the short one. */
339 int len = middle - bottom;
340 register int i;
341
342 /* Swap it with the top part of the top segment. */
343 for (i = 0; i < len; i++)
344 {
345 tem = argv[bottom + i];
346 argv[bottom + i] = argv[top - (middle - bottom) + i];
347 argv[top - (middle - bottom) + i] = tem;
348 SWAP_FLAGS (bottom + i, top - (middle - bottom) + i);
349 }
350 /* Exclude the moved bottom segment from further swapping. */
351 top -= len;
352 }
353 else
354 {
355 /* Top segment is the short one. */
356 int len = top - middle;
357 register int i;
358
359 /* Swap it with the bottom part of the bottom segment. */
360 for (i = 0; i < len; i++)
361 {
362 tem = argv[bottom + i];
363 argv[bottom + i] = argv[middle + i];
364 argv[middle + i] = tem;
365 SWAP_FLAGS (bottom + i, middle + i);
366 }
367 /* Exclude the moved top segment from further swapping. */
368 bottom += len;
369 }
370 }
371
372 /* Update records for the slots the non-options now occupy. */
373
374 first_nonopt += (optind - last_nonopt);
375 last_nonopt = optind;
376 }
377
378 /* Initialize the internal data when the first call is made. */
379
380 #if defined __STDC__ && __STDC__
381 static const char *_getopt_initialize (int, char *const *, const char *);
382 #endif
383 static const char *
384 _getopt_initialize (argc, argv, optstring)
385 int argc;
386 char *const *argv;
387 const char *optstring;
388 {
389 /* Start processing options with ARGV-element 1 (since ARGV-element 0
390 is the program name); the sequence of previously skipped
391 non-option ARGV-elements is empty. */
392
393 first_nonopt = last_nonopt = optind;
394
395 nextchar = NULL;
396
397 posixly_correct = getenv ("POSIXLY_CORRECT");
398
399 /* Determine how to handle the ordering of options and nonoptions. */
400
401 if (optstring[0] == '-')
402 {
403 ordering = RETURN_IN_ORDER;
404 ++optstring;
405 }
406 else if (optstring[0] == '+')
407 {
408 ordering = REQUIRE_ORDER;
409 ++optstring;
410 }
411 else if (posixly_correct != NULL)
412 ordering = REQUIRE_ORDER;
413 else
414 ordering = PERMUTE;
415
416 #if defined _LIBC && defined USE_NONOPTION_FLAGS
417 if (posixly_correct == NULL
418 && argc == __libc_argc && argv == __libc_argv)
419 {
420 if (nonoption_flags_max_len == 0)
421 {
422 if (__getopt_nonoption_flags == NULL
423 || __getopt_nonoption_flags[0] == '\0')
424 nonoption_flags_max_len = -1;
425 else
426 {
427 const char *orig_str = __getopt_nonoption_flags;
428 int len = nonoption_flags_max_len = strlen (orig_str);
429 if (nonoption_flags_max_len < argc)
430 nonoption_flags_max_len = argc;
431 __getopt_nonoption_flags =
432 (char *) malloc (nonoption_flags_max_len);
433 if (__getopt_nonoption_flags == NULL)
434 nonoption_flags_max_len = -1;
435 else
436 memset (__mempcpy (__getopt_nonoption_flags, orig_str, len),
437 '\0', nonoption_flags_max_len - len);
438 }
439 }
440 nonoption_flags_len = nonoption_flags_max_len;
441 }
442 else
443 nonoption_flags_len = 0;
444 #endif
445
446 return optstring;
447 }
448
449 /* Scan elements of ARGV (whose length is ARGC) for option characters
450 given in OPTSTRING.
451
452 If an element of ARGV starts with '-', and is not exactly "-" or "--",
453 then it is an option element. The characters of this element
454 (aside from the initial '-') are option characters. If `getopt'
455 is called repeatedly, it returns successively each of the option characters
456 from each of the option elements.
457
458 If `getopt' finds another option character, it returns that character,
459 updating `optind' and `nextchar' so that the next call to `getopt' can
460 resume the scan with the following option character or ARGV-element.
461
462 If there are no more option characters, `getopt' returns -1.
463 Then `optind' is the index in ARGV of the first ARGV-element
464 that is not an option. (The ARGV-elements have been permuted
465 so that those that are not options now come last.)
466
467 OPTSTRING is a string containing the legitimate option characters.
468 If an option character is seen that is not listed in OPTSTRING,
469 return '?' after printing an error message. If you set `opterr' to
470 zero, the error message is suppressed but we still return '?'.
471
472 If a char in OPTSTRING is followed by a colon, that means it wants an arg,
473 so the following text in the same ARGV-element, or the text of the following
474 ARGV-element, is returned in `optarg'. Two colons mean an option that
475 wants an optional arg; if there is text in the current ARGV-element,
476 it is returned in `optarg', otherwise `optarg' is set to zero.
477
478 If OPTSTRING starts with `-' or `+', it requests different methods of
479 handling the non-option ARGV-elements.
480 See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
481
482 Long-named options begin with `--' instead of `-'.
483 Their names may be abbreviated as long as the abbreviation is unique
484 or is an exact match for some defined option. If they have an
485 argument, it follows the option name in the same ARGV-element, separated
486 from the option name by a `=', or else the in next ARGV-element.
487 When `getopt' finds a long-named option, it returns 0 if that option's
488 `flag' field is nonzero, the value of the option's `val' field
489 if the `flag' field is zero.
490
491 The elements of ARGV aren't really const, because we permute them.
492 But we pretend they're const in the prototype to be compatible
493 with other systems.
494
495 LONGOPTS is a vector of `struct option' terminated by an
496 element containing a name which is zero.
497
498 LONGIND returns the index in LONGOPT of the long-named option found.
499 It is only valid when a long-named option has been found by the most
500 recent call.
501
502 If LONG_ONLY is nonzero, '-' as well as '--' can introduce
503 long-named options. */
504
505 int
506 _getopt_internal (argc, argv, optstring, longopts, longind, long_only)
507 int argc;
508 char *const *argv;
509 const char *optstring;
510 const struct option *longopts;
511 int *longind;
512 int long_only;
513 {
514 int print_errors = opterr;
515 if (optstring[0] == ':')
516 print_errors = 0;
517
518 if (argc < 1)
519 return -1;
520
521 optarg = NULL;
522
523 if (optind == 0 || !__getopt_initialized)
524 {
525 if (optind == 0)
526 optind = 1; /* Don't scan ARGV[0], the program name. */
527 optstring = _getopt_initialize (argc, argv, optstring);
528 __getopt_initialized = 1;
529 }
530
531 /* Test whether ARGV[optind] points to a non-option argument.
532 Either it does not have option syntax, or there is an environment flag
533 from the shell indicating it is not an option. The later information
534 is only used when the used in the GNU libc. */
535 #if defined _LIBC && defined USE_NONOPTION_FLAGS
536 # define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0' \
537 || (optind < nonoption_flags_len \
538 && __getopt_nonoption_flags[optind] == '1'))
539 #else
540 # define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0')
541 #endif
542
543 if (nextchar == NULL || *nextchar == '\0')
544 {
545 /* Advance to the next ARGV-element. */
546
547 /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been
548 moved back by the user (who may also have changed the arguments). */
549 if (last_nonopt > optind)
550 last_nonopt = optind;
551 if (first_nonopt > optind)
552 first_nonopt = optind;
553
554 if (ordering == PERMUTE)
555 {
556 /* If we have just processed some options following some non-options,
557 exchange them so that the options come first. */
558
559 if (first_nonopt != last_nonopt && last_nonopt != optind)
560 exchange ((char **) argv);
561 else if (last_nonopt != optind)
562 first_nonopt = optind;
563
564 /* Skip any additional non-options
565 and extend the range of non-options previously skipped. */
566
567 while (optind < argc && NONOPTION_P)
568 optind++;
569 last_nonopt = optind;
570 }
571
572 /* The special ARGV-element `--' means premature end of options.
573 Skip it like a null option,
574 then exchange with previous non-options as if it were an option,
575 then skip everything else like a non-option. */
576
577 if (optind != argc && !strcmp (argv[optind], "--"))
578 {
579 optind++;
580
581 if (first_nonopt != last_nonopt && last_nonopt != optind)
582 exchange ((char **) argv);
583 else if (first_nonopt == last_nonopt)
584 first_nonopt = optind;
585 last_nonopt = argc;
586
587 optind = argc;
588 }
589
590 /* If we have done all the ARGV-elements, stop the scan
591 and back over any non-options that we skipped and permuted. */
592
593 if (optind == argc)
594 {
595 /* Set the next-arg-index to point at the non-options
596 that we previously skipped, so the caller will digest them. */
597 if (first_nonopt != last_nonopt)
598 optind = first_nonopt;
599 return -1;
600 }
601
602 /* If we have come to a non-option and did not permute it,
603 either stop the scan or describe it to the caller and pass it by. */
604
605 if (NONOPTION_P)
606 {
607 if (ordering == REQUIRE_ORDER)
608 return -1;
609 optarg = argv[optind++];
610 return 1;
611 }
612
613 /* We have found another option-ARGV-element.
614 Skip the initial punctuation. */
615
616 nextchar = (argv[optind] + 1
617 + (longopts != NULL && argv[optind][1] == '-'));
618 }
619
620 /* Decode the current option-ARGV-element. */
621
622 /* Check whether the ARGV-element is a long option.
623
624 If long_only and the ARGV-element has the form "-f", where f is
625 a valid short option, don't consider it an abbreviated form of
626 a long option that starts with f. Otherwise there would be no
627 way to give the -f short option.
628
629 On the other hand, if there's a long option "fubar" and
630 the ARGV-element is "-fu", do consider that an abbreviation of
631 the long option, just like "--fu", and not "-f" with arg "u".
632
633 This distinction seems to be the most useful approach. */
634
635 if (longopts != NULL
636 && (argv[optind][1] == '-'
637 || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))
638 {
639 char *nameend;
640 const struct option *p;
641 const struct option *pfound = NULL;
642 int exact = 0;
643 int ambig = 0;
644 int indfound = -1;
645 int option_index;
646
647 for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
648 /* Do nothing. */ ;
649
650 /* Test all long options for either exact match
651 or abbreviated matches. */
652 for (p = longopts, option_index = 0; p->name; p++, option_index++)
653 if (!strncmp (p->name, nextchar, nameend - nextchar))
654 {
655 if ((unsigned int) (nameend - nextchar)
656 == (unsigned int) strlen (p->name))
657 {
658 /* Exact match found. */
659 pfound = p;
660 indfound = option_index;
661 exact = 1;
662 break;
663 }
664 else if (pfound == NULL)
665 {
666 /* First nonexact match found. */
667 pfound = p;
668 indfound = option_index;
669 }
670 else if (long_only
671 || pfound->has_arg != p->has_arg
672 || pfound->flag != p->flag
673 || pfound->val != p->val)
674 /* Second or later nonexact match found. */
675 ambig = 1;
676 }
677
678 if (ambig && !exact)
679 {
680 if (print_errors)
681 fprintf (stderr, _("%s: option `%s' is ambiguous\n"),
682 argv[0], argv[optind]);
683 nextchar += strlen (nextchar);
684 optind++;
685 optopt = 0;
686 return '?';
687 }
688
689 if (pfound != NULL)
690 {
691 option_index = indfound;
692 optind++;
693 if (*nameend)
694 {
695 /* Don't test has_arg with >, because some C compilers don't
696 allow it to be used on enums. */
697 if (pfound->has_arg)
698 optarg = nameend + 1;
699 else
700 {
701 if (print_errors)
702 {
703 if (argv[optind - 1][1] == '-')
704 /* --option */
705 fprintf (stderr,
706 _("%s: option `--%s' doesn't allow an argument\n"),
707 argv[0], pfound->name);
708 else
709 /* +option or -option */
710 fprintf (stderr,
711 _("%s: option `%c%s' doesn't allow an argument\n"),
712 argv[0], argv[optind - 1][0], pfound->name);
713 }
714
715 nextchar += strlen (nextchar);
716
717 optopt = pfound->val;
718 return '?';
719 }
720 }
721 else if (pfound->has_arg == 1)
722 {
723 if (optind < argc)
724 optarg = argv[optind++];
725 else
726 {
727 if (print_errors)
728 fprintf (stderr,
729 _("%s: option `%s' requires an argument\n"),
730 argv[0], argv[optind - 1]);
731 nextchar += strlen (nextchar);
732 optopt = pfound->val;
733 return optstring[0] == ':' ? ':' : '?';
734 }
735 }
736 nextchar += strlen (nextchar);
737 if (longind != NULL)
738 *longind = option_index;
739 if (pfound->flag)
740 {
741 *(pfound->flag) = pfound->val;
742 return 0;
743 }
744 return pfound->val;
745 }
746
747 /* Can't find it as a long option. If this is not getopt_long_only,
748 or the option starts with '--' or is not a valid short
749 option, then it's an error.
750 Otherwise interpret it as a short option. */
751 if (!long_only || argv[optind][1] == '-'
752 || my_index (optstring, *nextchar) == NULL)
753 {
754 if (print_errors)
755 {
756 if (argv[optind][1] == '-')
757 /* --option */
758 fprintf (stderr, _("%s: unrecognized option `--%s'\n"),
759 argv[0], nextchar);
760 else
761 /* +option or -option */
762 fprintf (stderr, _("%s: unrecognized option `%c%s'\n"),
763 argv[0], argv[optind][0], nextchar);
764 }
765 nextchar = (char *) "";
766 optind++;
767 optopt = 0;
768 return '?';
769 }
770 }
771
772 /* Look at and handle the next short option-character. */
773
774 {
775 char c = *nextchar++;
776 char *temp = my_index (optstring, c);
777
778 /* Increment `optind' when we start to process its last character. */
779 if (*nextchar == '\0')
780 ++optind;
781
782 if (temp == NULL || c == ':')
783 {
784 if (print_errors)
785 {
786 if (posixly_correct)
787 /* 1003.2 specifies the format of this message. */
788 fprintf (stderr, _("%s: illegal option -- %c\n"),
789 argv[0], c);
790 else
791 fprintf (stderr, _("%s: invalid option -- %c\n"),
792 argv[0], c);
793 }
794 optopt = c;
795 return '?';
796 }
797 /* Convenience. Treat POSIX -W foo same as long option --foo */
798 if (temp[0] == 'W' && temp[1] == ';')
799 {
800 char *nameend;
801 const struct option *p;
802 const struct option *pfound = NULL;
803 int exact = 0;
804 int ambig = 0;
805 int indfound = 0;
806 int option_index;
807
808 /* This is an option that requires an argument. */
809 if (*nextchar != '\0')
810 {
811 optarg = nextchar;
812 /* If we end this ARGV-element by taking the rest as an arg,
813 we must advance to the next element now. */
814 optind++;
815 }
816 else if (optind == argc)
817 {
818 if (print_errors)
819 {
820 /* 1003.2 specifies the format of this message. */
821 fprintf (stderr, _("%s: option requires an argument -- %c\n"),
822 argv[0], c);
823 }
824 optopt = c;
825 if (optstring[0] == ':')
826 c = ':';
827 else
828 c = '?';
829 return c;
830 }
831 else
832 /* We already incremented `optind' once;
833 increment it again when taking next ARGV-elt as argument. */
834 optarg = argv[optind++];
835
836 /* optarg is now the argument, see if it's in the
837 table of longopts. */
838
839 for (nextchar = nameend = optarg; *nameend && *nameend != '='; nameend++)
840 /* Do nothing. */ ;
841
842 /* Test all long options for either exact match
843 or abbreviated matches. */
844 for (p = longopts, option_index = 0; p->name; p++, option_index++)
845 if (!strncmp (p->name, nextchar, nameend - nextchar))
846 {
847 if ((unsigned int) (nameend - nextchar) == strlen (p->name))
848 {
849 /* Exact match found. */
850 pfound = p;
851 indfound = option_index;
852 exact = 1;
853 break;
854 }
855 else if (pfound == NULL)
856 {
857 /* First nonexact match found. */
858 pfound = p;
859 indfound = option_index;
860 }
861 else
862 /* Second or later nonexact match found. */
863 ambig = 1;
864 }
865 if (ambig && !exact)
866 {
867 if (print_errors)
868 fprintf (stderr, _("%s: option `-W %s' is ambiguous\n"),
869 argv[0], argv[optind]);
870 nextchar += strlen (nextchar);
871 optind++;
872 return '?';
873 }
874 if (pfound != NULL)
875 {
876 option_index = indfound;
877 if (*nameend)
878 {
879 /* Don't test has_arg with >, because some C compilers don't
880 allow it to be used on enums. */
881 if (pfound->has_arg)
882 optarg = nameend + 1;
883 else
884 {
885 if (print_errors)
886 fprintf (stderr, _("\
887 %s: option `-W %s' doesn't allow an argument\n"),
888 argv[0], pfound->name);
889
890 nextchar += strlen (nextchar);
891 return '?';
892 }
893 }
894 else if (pfound->has_arg == 1)
895 {
896 if (optind < argc)
897 optarg = argv[optind++];
898 else
899 {
900 if (print_errors)
901 fprintf (stderr,
902 _("%s: option `%s' requires an argument\n"),
903 argv[0], argv[optind - 1]);
904 nextchar += strlen (nextchar);
905 return optstring[0] == ':' ? ':' : '?';
906 }
907 }
908 nextchar += strlen (nextchar);
909 if (longind != NULL)
910 *longind = option_index;
911 if (pfound->flag)
912 {
913 *(pfound->flag) = pfound->val;
914 return 0;
915 }
916 return pfound->val;
917 }
918 nextchar = NULL;
919 return 'W'; /* Let the application handle it. */
920 }
921 if (temp[1] == ':')
922 {
923 if (temp[2] == ':')
924 {
925 /* This is an option that accepts an argument optionally. */
926 if (*nextchar != '\0')
927 {
928 optarg = nextchar;
929 optind++;
930 }
931 else
932 optarg = NULL;
933 nextchar = NULL;
934 }
935 else
936 {
937 /* This is an option that requires an argument. */
938 if (*nextchar != '\0')
939 {
940 optarg = nextchar;
941 /* If we end this ARGV-element by taking the rest as an arg,
942 we must advance to the next element now. */
943 optind++;
944 }
945 else if (optind == argc)
946 {
947 if (print_errors)
948 {
949 /* 1003.2 specifies the format of this message. */
950 fprintf (stderr,
951 _("%s: option requires an argument -- %c\n"),
952 argv[0], c);
953 }
954 optopt = c;
955 if (optstring[0] == ':')
956 c = ':';
957 else
958 c = '?';
959 }
960 else
961 /* We already incremented `optind' once;
962 increment it again when taking next ARGV-elt as argument. */
963 optarg = argv[optind++];
964 nextchar = NULL;
965 }
966 }
967 return c;
968 }
969 }
970
971 int
972 getopt (argc, argv, optstring)
973 int argc;
974 char *const *argv;
975 const char *optstring;
976 {
977 return _getopt_internal (argc, argv, optstring,
978 (const struct option *) 0,
979 (int *) 0,
980 0);
981 }
982
983 #endif /* Not ELIDE_CODE. */
984
985 #ifdef TEST
986
987 /* Compile with -DTEST to make an executable for use in testing
988 the above definition of `getopt'. */
989
990 int
991 main (argc, argv)
992 int argc;
993 char **argv;
994 {
995 int c;
996 int digit_optind = 0;
997
998 while (1)
999 {
1000 int this_option_optind = optind ? optind : 1;
1001
1002 c = getopt (argc, argv, "abc:d:0123456789");
1003 if (c == -1)
1004 break;
1005
1006 switch (c)
1007 {
1008 case '0':
1009 case '1':
1010 case '2':
1011 case '3':
1012 case '4':
1013 case '5':
1014 case '6':
1015 case '7':
1016 case '8':
1017 case '9':
1018 if (digit_optind != 0 && digit_optind != this_option_optind)
1019 printf ("digits occur in two different argv-elements.\n");
1020 digit_optind = this_option_optind;
1021 printf ("option %c\n", c);
1022 break;
1023
1024 case 'a':
1025 printf ("option a\n");
1026 break;
1027
1028 case 'b':
1029 printf ("option b\n");
1030 break;
1031
1032 case 'c':
1033 printf ("option c with value `%s'\n", optarg);
1034 break;
1035
1036 case '?':
1037 break;
1038
1039 default:
1040 printf ("?? getopt returned character code 0%o ??\n", c);
1041 }
1042 }
1043
1044 if (optind < argc)
1045 {
1046 printf ("non-option ARGV-elements: ");
1047 while (optind < argc)
1048 printf ("%s ", argv[optind++]);
1049 printf ("\n");
1050 }
1051
1052 exit (0);
1053 }
1054
1055 #endif /* TEST */
option
Definition: gnugetopt.h:94
main
int main(int argc, char *argv[])
Definition: ofxdump.cpp:434