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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 roland@gnu.ai.mit.edu
4 before changing it!
6 Copyright (C) 1987, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97
7 Free Software Foundation, Inc.
9 The GNU C Library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Library General Public License as
11 published by the Free Software Foundation; either version 2 of the
12 License, or (at your option) any later version.
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 Library General Public License for more details.
19 You should have received a copy of the GNU Library General Public
20 License along with the GNU C Library; see the file COPYING.LIB. If not,
21 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301 USA. */
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
30 #ifdef HAVE_CONFIG_H
31 #include <config.h>
32 #endif
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
42 #include <stdio.h>
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. */
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
60 #ifndef ELIDE_CODE
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. */
72 #ifdef VMS
73 #include <unixlib.h>
74 #if HAVE_STRING_H - 0
75 #include <string.h>
76 #endif
77 #endif
79 #if defined (WIN32) && !defined (__CYGWIN32__)
80 /* It's not Unix, really. See? Capital letters. */
81 #include <windows.h>
82 #define getpid() GetCurrentProcessId()
83 #endif
85 #ifndef _
86 /* This is for other GNU distributions with internationalized messages.
87 When compiling libc, the _ macro is predefined. */
88 #ifdef HAVE_LIBINTL_H
89 # include <libintl.h>
90 # define _(msgid) gettext (msgid)
91 #else
92 # define _(msgid) (msgid)
93 #endif
94 #endif
96 /* This version of `getopt' appears to the caller like standard Unix `getopt'
97 but it behaves differently for the user, since it allows the user
98 to intersperse the options with the other arguments.
100 As `getopt' works, it permutes the elements of ARGV so that,
101 when it is done, all the options precede everything else. Thus
102 all application programs are extended to handle flexible argument order.
104 Setting the environment variable POSIXLY_CORRECT disables permutation.
105 Then the behavior is completely standard.
107 GNU application programs can use a third alternative mode in which
108 they can distinguish the relative order of options and other arguments. */
110 #include "getopt.h"
112 /* For communication from `getopt' to the caller.
113 When `getopt' finds an option that takes an argument,
114 the argument value is returned here.
115 Also, when `ordering' is RETURN_IN_ORDER,
116 each non-option ARGV-element is returned here. */
118 char *optarg = NULL;
120 /* Index in ARGV of the next element to be scanned.
121 This is used for communication to and from the caller
122 and for communication between successive calls to `getopt'.
124 On entry to `getopt', zero means this is the first call; initialize.
126 When `getopt' returns -1, this is the index of the first of the
127 non-option elements that the caller should itself scan.
129 Otherwise, `optind' communicates from one call to the next
130 how much of ARGV has been scanned so far. */
132 /* 1003.2 says this must be 1 before any call. */
133 int optind = 1;
135 /* Formerly, initialization of getopt depended on optind==0, which
136 causes problems with re-calling getopt as programs generally don't
137 know that. */
139 int __getopt_initialized = 0;
141 /* The next char to be scanned in the option-element
142 in which the last option character we returned was found.
143 This allows us to pick up the scan where we left off.
145 If this is zero, or a null string, it means resume the scan
146 by advancing to the next ARGV-element. */
148 static char *nextchar;
150 /* Callers store zero here to inhibit the error message
151 for unrecognized options. */
153 int opterr = 1;
155 /* Set to an option character which was unrecognized.
156 This must be initialized on some systems to avoid linking in the
157 system's own getopt implementation. */
159 int optopt = '?';
161 /* Describe how to deal with options that follow non-option ARGV-elements.
163 If the caller did not specify anything,
164 the default is REQUIRE_ORDER if the environment variable
165 POSIXLY_CORRECT is defined, PERMUTE otherwise.
167 REQUIRE_ORDER means don't recognize them as options;
168 stop option processing when the first non-option is seen.
169 This is what Unix does.
170 This mode of operation is selected by either setting the environment
171 variable POSIXLY_CORRECT, or using `+' as the first character
172 of the list of option characters.
174 PERMUTE is the default. We permute the contents of ARGV as we scan,
175 so that eventually all the non-options are at the end. This allows options
176 to be given in any order, even with programs that were not written to
177 expect this.
179 RETURN_IN_ORDER is an option available to programs that were written
180 to expect options and other ARGV-elements in any order and that care about
181 the ordering of the two. We describe each non-option ARGV-element
182 as if it were the argument of an option with character code 1.
183 Using `-' as the first character of the list of option characters
184 selects this mode of operation.
186 The special argument `--' forces an end of option-scanning regardless
187 of the value of `ordering'. In the case of RETURN_IN_ORDER, only
188 `--' can cause `getopt' to return -1 with `optind' != ARGC. */
190 static enum
192 REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
193 } ordering;
195 /* Value of POSIXLY_CORRECT environment variable. */
196 static char *posixly_correct;
198 #ifdef __GNU_LIBRARY__
199 /* We want to avoid inclusion of string.h with non-GNU libraries
200 because there are many ways it can cause trouble.
201 On some systems, it contains special magic macros that don't work
202 in GCC. */
203 #include <string.h>
204 #define my_index strchr
205 #else
207 /* Avoid depending on library functions or files
208 whose names are inconsistent. */
210 char *getenv ();
211 extern int strncmp(const char *s1, const char *s2, size_t len);
213 static char *
214 my_index (str, chr)
215 const char *str;
216 int chr;
218 while (*str)
220 if (*str == chr)
221 return (char *) str;
222 str++;
224 return 0;
227 /* If using GCC, we can safely declare strlen this way.
228 If not using GCC, it is ok not to declare it. */
229 #ifdef __GNUC__
230 /* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
231 That was relevant to code that was here before. */
232 #if !defined (__STDC__) || !__STDC__
233 /* gcc with -traditional declares the built-in strlen to return int,
234 and has done so at least since version 2.4.5. -- rms. */
235 extern int strlen (const char *);
236 #endif /* not __STDC__ */
237 #endif /* __GNUC__ */
239 #endif /* not __GNU_LIBRARY__ */
241 /* Handle permutation of arguments. */
243 /* Describe the part of ARGV that contains non-options that have
244 been skipped. `first_nonopt' is the index in ARGV of the first of them;
245 `last_nonopt' is the index after the last of them. */
247 static int first_nonopt;
248 static int last_nonopt;
250 #ifdef _LIBC
251 /* Bash 2.0 gives us an environment variable containing flags
252 indicating ARGV elements that should not be considered arguments. */
254 /* Defined in getopt_init.c */
255 extern char *__getopt_nonoption_flags;
257 static int nonoption_flags_max_len;
258 static int nonoption_flags_len;
260 static int original_argc;
261 static char *const *original_argv;
263 extern pid_t __libc_pid;
265 /* Make sure the environment variable bash 2.0 puts in the environment
266 is valid for the getopt call we must make sure that the ARGV passed
267 to getopt is that one passed to the process. */
268 static void
269 __attribute__ ((unused))
270 store_args_and_env (int argc, char *const *argv)
272 /* XXX This is no good solution. We should rather copy the args so
273 that we can compare them later. But we must not use malloc(3). */
274 original_argc = argc;
275 original_argv = argv;
277 text_set_element (__libc_subinit, store_args_and_env);
279 # define SWAP_FLAGS(ch1, ch2) \
280 if (nonoption_flags_len > 0) \
282 char __tmp = __getopt_nonoption_flags[ch1]; \
283 __getopt_nonoption_flags[ch1] = __getopt_nonoption_flags[ch2]; \
284 __getopt_nonoption_flags[ch2] = __tmp; \
286 #else /* !_LIBC */
287 # define SWAP_FLAGS(ch1, ch2)
288 #endif /* _LIBC */
290 /* Exchange two adjacent subsequences of ARGV.
291 One subsequence is elements [first_nonopt,last_nonopt)
292 which contains all the non-options that have been skipped so far.
293 The other is elements [last_nonopt,optind), which contains all
294 the options processed since those non-options were skipped.
296 `first_nonopt' and `last_nonopt' are relocated so that they describe
297 the new indices of the non-options in ARGV after they are moved. */
299 #if defined (__STDC__) && __STDC__
300 static void exchange (char **);
301 #endif
303 static void
304 exchange (argv)
305 char **argv;
307 int bottom = first_nonopt;
308 int middle = last_nonopt;
309 int top = optind;
310 char *tem;
312 /* Exchange the shorter segment with the far end of the longer segment.
313 That puts the shorter segment into the right place.
314 It leaves the longer segment in the right place overall,
315 but it consists of two parts that need to be swapped next. */
317 #ifdef _LIBC
318 /* First make sure the handling of the `__getopt_nonoption_flags'
319 string can work normally. Our top argument must be in the range
320 of the string. */
321 if (nonoption_flags_len > 0 && top >= nonoption_flags_max_len)
323 /* We must extend the array. The user plays games with us and
324 presents new arguments. */
325 char *new_str = malloc (top + 1);
326 if (new_str == NULL)
327 nonoption_flags_len = nonoption_flags_max_len = 0;
328 else
330 memcpy (new_str, __getopt_nonoption_flags, nonoption_flags_max_len);
331 memset (&new_str[nonoption_flags_max_len], '\0',
332 top + 1 - nonoption_flags_max_len);
333 nonoption_flags_max_len = top + 1;
334 __getopt_nonoption_flags = new_str;
337 #endif
339 while (top > middle && middle > bottom)
341 if (top - middle > middle - bottom)
343 /* Bottom segment is the short one. */
344 int len = middle - bottom;
345 register int i;
347 /* Swap it with the top part of the top segment. */
348 for (i = 0; i < len; i++)
350 tem = argv[bottom + i];
351 argv[bottom + i] = argv[top - (middle - bottom) + i];
352 argv[top - (middle - bottom) + i] = tem;
353 SWAP_FLAGS (bottom + i, top - (middle - bottom) + i);
355 /* Exclude the moved bottom segment from further swapping. */
356 top -= len;
358 else
360 /* Top segment is the short one. */
361 int len = top - middle;
362 register int i;
364 /* Swap it with the bottom part of the bottom segment. */
365 for (i = 0; i < len; i++)
367 tem = argv[bottom + i];
368 argv[bottom + i] = argv[middle + i];
369 argv[middle + i] = tem;
370 SWAP_FLAGS (bottom + i, middle + i);
372 /* Exclude the moved top segment from further swapping. */
373 bottom += len;
377 /* Update records for the slots the non-options now occupy. */
379 first_nonopt += (optind - last_nonopt);
380 last_nonopt = optind;
383 /* Initialize the internal data when the first call is made. */
385 #if defined (__STDC__) && __STDC__
386 static const char *_getopt_initialize (int, char *const *, const char *);
387 #endif
388 static const char *
389 _getopt_initialize (argc, argv, optstring)
390 int argc;
391 char *const *argv;
392 const char *optstring;
394 /* Start processing options with ARGV-element 1 (since ARGV-element 0
395 is the program name); the sequence of previously skipped
396 non-option ARGV-elements is empty. */
398 first_nonopt = last_nonopt = optind;
400 nextchar = NULL;
402 posixly_correct = getenv ("POSIXLY_CORRECT");
404 /* Determine how to handle the ordering of options and nonoptions. */
406 if (optstring[0] == '-')
408 ordering = RETURN_IN_ORDER;
409 ++optstring;
411 else if (optstring[0] == '+')
413 ordering = REQUIRE_ORDER;
414 ++optstring;
416 else if (posixly_correct != NULL)
417 ordering = REQUIRE_ORDER;
418 else
419 ordering = PERMUTE;
421 #ifdef _LIBC
422 if (posixly_correct == NULL
423 && argc == original_argc && argv == original_argv)
425 if (nonoption_flags_max_len == 0)
427 if (__getopt_nonoption_flags == NULL
428 || __getopt_nonoption_flags[0] == '\0')
429 nonoption_flags_max_len = -1;
430 else
432 const char *orig_str = __getopt_nonoption_flags;
433 int len = nonoption_flags_max_len = strlen (orig_str);
434 if (nonoption_flags_max_len < argc)
435 nonoption_flags_max_len = argc;
436 __getopt_nonoption_flags =
437 (char *) malloc (nonoption_flags_max_len);
438 if (__getopt_nonoption_flags == NULL)
439 nonoption_flags_max_len = -1;
440 else
442 memcpy (__getopt_nonoption_flags, orig_str, len);
443 memset (&__getopt_nonoption_flags[len], '\0',
444 nonoption_flags_max_len - len);
448 nonoption_flags_len = nonoption_flags_max_len;
450 else
451 nonoption_flags_len = 0;
452 #endif
454 return optstring;
457 /* Scan elements of ARGV (whose length is ARGC) for option characters
458 given in OPTSTRING.
460 If an element of ARGV starts with '-', and is not exactly "-" or "--",
461 then it is an option element. The characters of this element
462 (aside from the initial '-') are option characters. If `getopt'
463 is called repeatedly, it returns successively each of the option characters
464 from each of the option elements.
466 If `getopt' finds another option character, it returns that character,
467 updating `optind' and `nextchar' so that the next call to `getopt' can
468 resume the scan with the following option character or ARGV-element.
470 If there are no more option characters, `getopt' returns -1.
471 Then `optind' is the index in ARGV of the first ARGV-element
472 that is not an option. (The ARGV-elements have been permuted
473 so that those that are not options now come last.)
475 OPTSTRING is a string containing the legitimate option characters.
476 If an option character is seen that is not listed in OPTSTRING,
477 return '?' after printing an error message. If you set `opterr' to
478 zero, the error message is suppressed but we still return '?'.
480 If a char in OPTSTRING is followed by a colon, that means it wants an arg,
481 so the following text in the same ARGV-element, or the text of the following
482 ARGV-element, is returned in `optarg'. Two colons mean an option that
483 wants an optional arg; if there is text in the current ARGV-element,
484 it is returned in `optarg', otherwise `optarg' is set to zero.
486 If OPTSTRING starts with `-' or `+', it requests different methods of
487 handling the non-option ARGV-elements.
488 See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
490 Long-named options begin with `--' instead of `-'.
491 Their names may be abbreviated as long as the abbreviation is unique
492 or is an exact match for some defined option. If they have an
493 argument, it follows the option name in the same ARGV-element, separated
494 from the option name by a `=', or else the in next ARGV-element.
495 When `getopt' finds a long-named option, it returns 0 if that option's
496 `flag' field is nonzero, the value of the option's `val' field
497 if the `flag' field is zero.
499 The elements of ARGV aren't really const, because we permute them.
500 But we pretend they're const in the prototype to be compatible
501 with other systems.
503 LONGOPTS is a vector of `struct option' terminated by an
504 element containing a name which is zero.
506 LONGIND returns the index in LONGOPT of the long-named option found.
507 It is only valid when a long-named option has been found by the most
508 recent call.
510 If LONG_ONLY is nonzero, '-' as well as '--' can introduce
511 long-named options. */
514 _getopt_internal (argc, argv, optstring, longopts, longind, long_only)
515 int argc;
516 char *const *argv;
517 const char *optstring;
518 const struct option *longopts;
519 int *longind;
520 int long_only;
522 optarg = NULL;
524 if (optind == 0 || !__getopt_initialized)
526 if (optind == 0)
527 optind = 1; /* Don't scan ARGV[0], the program name. */
528 optstring = _getopt_initialize (argc, argv, optstring);
529 __getopt_initialized = 1;
532 /* Test whether ARGV[optind] points to a non-option argument.
533 Either it does not have option syntax, or there is an environment flag
534 from the shell indicating it is not an option. The later information
535 is only used when the used in the GNU libc. */
536 #ifdef _LIBC
537 #define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0' \
538 || (optind < nonoption_flags_len \
539 && __getopt_nonoption_flags[optind] == '1'))
540 #else
541 #define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0')
542 #endif
544 if (nextchar == NULL || *nextchar == '\0')
546 /* Advance to the next ARGV-element. */
548 /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been
549 moved back by the user (who may also have changed the arguments). */
550 if (last_nonopt > optind)
551 last_nonopt = optind;
552 if (first_nonopt > optind)
553 first_nonopt = optind;
555 if (ordering == PERMUTE)
557 /* If we have just processed some options following some non-options,
558 exchange them so that the options come first. */
560 if (first_nonopt != last_nonopt && last_nonopt != optind)
561 exchange ((char **) argv);
562 else if (last_nonopt != optind)
563 first_nonopt = optind;
565 /* Skip any additional non-options
566 and extend the range of non-options previously skipped. */
568 while (optind < argc && NONOPTION_P)
569 optind++;
570 last_nonopt = optind;
573 /* The special ARGV-element `--' means premature end of options.
574 Skip it like a null option,
575 then exchange with previous non-options as if it were an option,
576 then skip everything else like a non-option. */
578 if (optind != argc && !strcmp (argv[optind], "--"))
580 optind++;
582 if (first_nonopt != last_nonopt && last_nonopt != optind)
583 exchange ((char **) argv);
584 else if (first_nonopt == last_nonopt)
585 first_nonopt = optind;
586 last_nonopt = argc;
588 optind = argc;
591 /* If we have done all the ARGV-elements, stop the scan
592 and back over any non-options that we skipped and permuted. */
594 if (optind == argc)
596 /* Set the next-arg-index to point at the non-options
597 that we previously skipped, so the caller will digest them. */
598 if (first_nonopt != last_nonopt)
599 optind = first_nonopt;
600 return -1;
603 /* If we have come to a non-option and did not permute it,
604 either stop the scan or describe it to the caller and pass it by. */
606 if (NONOPTION_P)
608 if (ordering == REQUIRE_ORDER)
609 return -1;
610 optarg = argv[optind++];
611 return 1;
614 /* We have found another option-ARGV-element.
615 Skip the initial punctuation. */
617 nextchar = (argv[optind] + 1
618 + (longopts != NULL && argv[optind][1] == '-'));
621 /* Decode the current option-ARGV-element. */
623 /* Check whether the ARGV-element is a long option.
625 If long_only and the ARGV-element has the form "-f", where f is
626 a valid short option, don't consider it an abbreviated form of
627 a long option that starts with f. Otherwise there would be no
628 way to give the -f short option.
630 On the other hand, if there's a long option "fubar" and
631 the ARGV-element is "-fu", do consider that an abbreviation of
632 the long option, just like "--fu", and not "-f" with arg "u".
634 This distinction seems to be the most useful approach. */
636 if (longopts != NULL
637 && (argv[optind][1] == '-'
638 || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))
640 char *nameend;
641 const struct option *p;
642 const struct option *pfound = NULL;
643 int exact = 0;
644 int ambig = 0;
645 int indfound = -1;
646 int option_index;
648 for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
649 /* Do nothing. */ ;
651 /* Test all long options for either exact match
652 or abbreviated matches. */
653 for (p = longopts, option_index = 0; p->name; p++, option_index++)
654 if (!strncmp (p->name, nextchar, nameend - nextchar))
656 if ((unsigned int) (nameend - nextchar)
657 == (unsigned int) strlen (p->name))
659 /* Exact match found. */
660 pfound = p;
661 indfound = option_index;
662 exact = 1;
663 break;
665 else if (pfound == NULL)
667 /* First nonexact match found. */
668 pfound = p;
669 indfound = option_index;
671 else
672 /* Second or later nonexact match found. */
673 ambig = 1;
676 if (ambig && !exact)
678 if (opterr)
679 fprintf (stderr, _("%s: option `%s' is ambiguous\n"),
680 argv[0], argv[optind]);
681 nextchar += strlen (nextchar);
682 optind++;
683 optopt = 0;
684 return '?';
687 if (pfound != NULL)
689 option_index = indfound;
690 optind++;
691 if (*nameend)
693 /* Don't test has_arg with >, because some C compilers don't
694 allow it to be used on enums. */
695 if (pfound->has_arg)
696 optarg = nameend + 1;
697 else
699 if (opterr)
700 if (argv[optind - 1][1] == '-')
701 /* --option */
702 fprintf (stderr,
703 _("%s: option `--%s' doesn't allow an argument\n"),
704 argv[0], pfound->name);
705 else
706 /* +option or -option */
707 fprintf (stderr,
708 _("%s: option `%c%s' doesn't allow an argument\n"),
709 argv[0], argv[optind - 1][0], pfound->name);
711 nextchar += strlen (nextchar);
713 optopt = pfound->val;
714 return '?';
717 else if (pfound->has_arg == 1)
719 if (optind < argc)
720 optarg = argv[optind++];
721 else
723 if (opterr)
724 fprintf (stderr,
725 _("%s: option `%s' requires an argument\n"),
726 argv[0], argv[optind - 1]);
727 nextchar += strlen (nextchar);
728 optopt = pfound->val;
729 return optstring[0] == ':' ? ':' : '?';
732 nextchar += strlen (nextchar);
733 if (longind != NULL)
734 *longind = option_index;
735 if (pfound->flag)
737 *(pfound->flag) = pfound->val;
738 return 0;
740 return pfound->val;
743 /* Can't find it as a long option. If this is not getopt_long_only,
744 or the option starts with '--' or is not a valid short
745 option, then it's an error.
746 Otherwise interpret it as a short option. */
747 if (!long_only || argv[optind][1] == '-'
748 || my_index (optstring, *nextchar) == NULL)
750 if (opterr)
752 if (argv[optind][1] == '-')
753 /* --option */
754 fprintf (stderr, _("%s: unrecognized option `--%s'\n"),
755 argv[0], nextchar);
756 else
757 /* +option or -option */
758 fprintf (stderr, _("%s: unrecognized option `%c%s'\n"),
759 argv[0], argv[optind][0], nextchar);
761 nextchar = (char *) "";
762 optind++;
763 optopt = 0;
764 return '?';
768 /* Look at and handle the next short option-character. */
771 char c = *nextchar++;
772 char *temp = my_index (optstring, c);
774 /* Increment `optind' when we start to process its last character. */
775 if (*nextchar == '\0')
776 ++optind;
778 if (temp == NULL || c == ':')
780 if (opterr)
782 if (posixly_correct)
783 /* 1003.2 specifies the format of this message. */
784 fprintf (stderr, _("%s: illegal option -- %c\n"),
785 argv[0], c);
786 else
787 fprintf (stderr, _("%s: invalid option -- %c\n"),
788 argv[0], c);
790 optopt = c;
791 return '?';
793 /* Convenience. Treat POSIX -W foo same as long option --foo */
794 if (temp[0] == 'W' && temp[1] == ';')
796 char *nameend;
797 const struct option *p;
798 const struct option *pfound = NULL;
799 int exact = 0;
800 int ambig = 0;
801 int indfound = 0;
802 int option_index;
804 /* This is an option that requires an argument. */
805 if (*nextchar != '\0')
807 optarg = nextchar;
808 /* If we end this ARGV-element by taking the rest as an arg,
809 we must advance to the next element now. */
810 optind++;
812 else if (optind == argc)
814 if (opterr)
816 /* 1003.2 specifies the format of this message. */
817 fprintf (stderr, _("%s: option requires an argument -- %c\n"),
818 argv[0], c);
820 optopt = c;
821 if (optstring[0] == ':')
822 c = ':';
823 else
824 c = '?';
825 return c;
827 else
828 /* We already incremented `optind' once;
829 increment it again when taking next ARGV-elt as argument. */
830 optarg = argv[optind++];
832 /* optarg is now the argument, see if it's in the
833 table of longopts. */
835 for (nextchar = nameend = optarg; *nameend && *nameend != '='; nameend++)
836 /* Do nothing. */ ;
838 /* Test all long options for either exact match
839 or abbreviated matches. */
840 for (p = longopts, option_index = 0; p->name; p++, option_index++)
841 if (!strncmp (p->name, nextchar, nameend - nextchar))
843 if ((unsigned int) (nameend - nextchar) == strlen (p->name))
845 /* Exact match found. */
846 pfound = p;
847 indfound = option_index;
848 exact = 1;
849 break;
851 else if (pfound == NULL)
853 /* First nonexact match found. */
854 pfound = p;
855 indfound = option_index;
857 else
858 /* Second or later nonexact match found. */
859 ambig = 1;
861 if (ambig && !exact)
863 if (opterr)
864 fprintf (stderr, _("%s: option `-W %s' is ambiguous\n"),
865 argv[0], argv[optind]);
866 nextchar += strlen (nextchar);
867 optind++;
868 return '?';
870 if (pfound != NULL)
872 option_index = indfound;
873 if (*nameend)
875 /* Don't test has_arg with >, because some C compilers don't
876 allow it to be used on enums. */
877 if (pfound->has_arg)
878 optarg = nameend + 1;
879 else
881 if (opterr)
882 fprintf (stderr, _("\
883 %s: option `-W %s' doesn't allow an argument\n"),
884 argv[0], pfound->name);
886 nextchar += strlen (nextchar);
887 return '?';
890 else if (pfound->has_arg == 1)
892 if (optind < argc)
893 optarg = argv[optind++];
894 else
896 if (opterr)
897 fprintf (stderr,
898 _("%s: option `%s' requires an argument\n"),
899 argv[0], argv[optind - 1]);
900 nextchar += strlen (nextchar);
901 return optstring[0] == ':' ? ':' : '?';
904 nextchar += strlen (nextchar);
905 if (longind != NULL)
906 *longind = option_index;
907 if (pfound->flag)
909 *(pfound->flag) = pfound->val;
910 return 0;
912 return pfound->val;
914 nextchar = NULL;
915 return 'W'; /* Let the application handle it. */
917 if (temp[1] == ':')
919 if (temp[2] == ':')
921 /* This is an option that accepts an argument optionally. */
922 if (*nextchar != '\0')
924 optarg = nextchar;
925 optind++;
927 else
928 optarg = NULL;
929 nextchar = NULL;
931 else
933 /* This is an option that requires an argument. */
934 if (*nextchar != '\0')
936 optarg = nextchar;
937 /* If we end this ARGV-element by taking the rest as an arg,
938 we must advance to the next element now. */
939 optind++;
941 else if (optind == argc)
943 if (opterr)
945 /* 1003.2 specifies the format of this message. */
946 fprintf (stderr,
947 _("%s: option requires an argument -- %c\n"),
948 argv[0], c);
950 optopt = c;
951 if (optstring[0] == ':')
952 c = ':';
953 else
954 c = '?';
956 else
957 /* We already incremented `optind' once;
958 increment it again when taking next ARGV-elt as argument. */
959 optarg = argv[optind++];
960 nextchar = NULL;
963 return c;
968 getopt (argc, argv, optstring)
969 int argc;
970 char *const *argv;
971 const char *optstring;
973 return _getopt_internal (argc, argv, optstring,
974 (const struct option *) 0,
975 (int *) 0,
979 #endif /* Not ELIDE_CODE. */
981 #ifdef TEST
983 /* Compile with -DTEST to make an executable for use in testing
984 the above definition of `getopt'. */
987 main (argc, argv)
988 int argc;
989 char **argv;
991 int c;
992 int digit_optind = 0;
994 while (1)
996 int this_option_optind = optind ? optind : 1;
998 c = getopt (argc, argv, "abc:d:0123456789");
999 if (c == -1)
1000 break;
1002 switch (c)
1004 case '0':
1005 case '1':
1006 case '2':
1007 case '3':
1008 case '4':
1009 case '5':
1010 case '6':
1011 case '7':
1012 case '8':
1013 case '9':
1014 if (digit_optind != 0 && digit_optind != this_option_optind)
1015 printf ("digits occur in two different argv-elements.\n");
1016 digit_optind = this_option_optind;
1017 printf ("option %c\n", c);
1018 break;
1020 case 'a':
1021 printf ("option a\n");
1022 break;
1024 case 'b':
1025 printf ("option b\n");
1026 break;
1028 case 'c':
1029 printf ("option c with value `%s'\n", optarg);
1030 break;
1032 case '?':
1033 break;
1035 default:
1036 printf ("?? getopt returned character code 0%o ??\n", c);
1040 if (optind < argc)
1042 printf ("non-option ARGV-elements: ");
1043 while (optind < argc)
1044 printf ("%s ", argv[optind++]);
1045 printf ("\n");
1048 exit (0);
1051 #endif /* TEST */