update from main archive 961016
[glibc.git] / posix / getopt.c
blobf4507d42d6fdd47f6e4d19b678a1c6a35cf91bd7
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, 1996
7 Free Software Foundation, Inc.
9 This file is part of the GNU C Library. Its master source is NOT part of
10 the C library, however. The master source lives in /gd/gnu/lib.
12 The GNU C Library is free software; you can redistribute it and/or
13 modify it under the terms of the GNU Library General Public License as
14 published by the Free Software Foundation; either version 2 of the
15 License, or (at your option) any later version.
17 The GNU C Library is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 Library General Public License for more details.
22 You should have received a copy of the GNU Library General Public
23 License along with the GNU C Library; see the file COPYING.LIB. If
24 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
25 Cambridge, MA 02139, USA. */
27 /* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.
28 Ditto for AIX 3.2 and <stdlib.h>. */
29 #ifndef _NO_PROTO
30 #define _NO_PROTO
31 #endif
33 #ifdef HAVE_CONFIG_H
34 #include <config.h>
35 #endif
37 #if !defined (__STDC__) || !__STDC__
38 /* This is a separate conditional since some stdc systems
39 reject `defined (const)'. */
40 #ifndef const
41 #define const
42 #endif
43 #endif
45 #include <stdio.h>
47 /* Comment out all this code if we are using the GNU C Library, and are not
48 actually compiling the library itself. This code is part of the GNU C
49 Library, but also included in many other GNU distributions. Compiling
50 and linking in this code is a waste when using the GNU C library
51 (especially if it is a shared library). Rather than having every GNU
52 program understand `configure --with-gnu-libc' and omit the object files,
53 it is simpler to just do this in the source for each such file. */
55 #if defined (_LIBC) || !defined (__GNU_LIBRARY__)
58 /* This needs to come after some library #include
59 to get __GNU_LIBRARY__ defined. */
60 #ifdef __GNU_LIBRARY__
61 /* Don't include stdlib.h for non-GNU C libraries because some of them
62 contain conflicting prototypes for getopt. */
63 #include <stdlib.h>
64 #include <unistd.h>
65 #endif /* GNU C library. */
67 #ifdef VMS
68 #include <unixlib.h>
69 #if HAVE_STRING_H - 0
70 #include <string.h>
71 #endif
72 #endif
74 #if defined (WIN32) && !defined (__CYGWIN32__)
75 /* It's not Unix, really. See? Capital letters. */
76 #include <windows.h>
77 #define getpid() GetCurrentProcessId()
78 #endif
80 #ifndef _
81 /* This is for other GNU distributions with internationalized messages.
82 When compiling libc, the _ macro is predefined. */
83 #ifdef HAVE_LIBINTL_H
84 # include <libintl.h>
85 # define _(msgid) gettext (msgid)
86 #else
87 # define _(msgid) (msgid)
88 #endif
89 #endif
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.
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.
99 Setting the environment variable POSIXLY_CORRECT disables permutation.
100 Then the behavior is completely standard.
102 GNU application programs can use a third alternative mode in which
103 they can distinguish the relative order of options and other arguments. */
105 #include "getopt.h"
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. */
113 char *optarg = NULL;
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'.
119 On entry to `getopt', zero means this is the first call; initialize.
121 When `getopt' returns EOF, this is the index of the first of the
122 non-option elements that the caller should itself scan.
124 Otherwise, `optind' communicates from one call to the next
125 how much of ARGV has been scanned so far. */
127 /* XXX 1003.2 says this must be 1 before any call. */
128 int optind = 0;
130 /* The next char to be scanned in the option-element
131 in which the last option character we returned was found.
132 This allows us to pick up the scan where we left off.
134 If this is zero, or a null string, it means resume the scan
135 by advancing to the next ARGV-element. */
137 static char *nextchar;
139 /* Callers store zero here to inhibit the error message
140 for unrecognized options. */
142 int opterr = 1;
144 /* Set to an option character which was unrecognized.
145 This must be initialized on some systems to avoid linking in the
146 system's own getopt implementation. */
148 int optopt = '?';
150 /* Describe how to deal with options that follow non-option ARGV-elements.
152 If the caller did not specify anything,
153 the default is REQUIRE_ORDER if the environment variable
154 POSIXLY_CORRECT is defined, PERMUTE otherwise.
156 REQUIRE_ORDER means don't recognize them as options;
157 stop option processing when the first non-option is seen.
158 This is what Unix does.
159 This mode of operation is selected by either setting the environment
160 variable POSIXLY_CORRECT, or using `+' as the first character
161 of the list of option characters.
163 PERMUTE is the default. We permute the contents of ARGV as we scan,
164 so that eventually all the non-options are at the end. This allows options
165 to be given in any order, even with programs that were not written to
166 expect this.
168 RETURN_IN_ORDER is an option available to programs that were written
169 to expect options and other ARGV-elements in any order and that care about
170 the ordering of the two. We describe each non-option ARGV-element
171 as if it were the argument of an option with character code 1.
172 Using `-' as the first character of the list of option characters
173 selects this mode of operation.
175 The special argument `--' forces an end of option-scanning regardless
176 of the value of `ordering'. In the case of RETURN_IN_ORDER, only
177 `--' can cause `getopt' to return EOF with `optind' != ARGC. */
179 static enum
181 REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
182 } ordering;
184 /* Value of POSIXLY_CORRECT environment variable. */
185 static char *posixly_correct;
187 #ifdef __GNU_LIBRARY__
188 /* We want to avoid inclusion of string.h with non-GNU libraries
189 because there are many ways it can cause trouble.
190 On some systems, it contains special magic macros that don't work
191 in GCC. */
192 #include <string.h>
193 #define my_index strchr
194 #else
196 /* Avoid depending on library functions or files
197 whose names are inconsistent. */
199 char *getenv ();
201 static char *
202 my_index (str, chr)
203 const char *str;
204 int chr;
206 while (*str)
208 if (*str == chr)
209 return (char *) str;
210 str++;
212 return 0;
215 /* If using GCC, we can safely declare strlen this way.
216 If not using GCC, it is ok not to declare it. */
217 #ifdef __GNUC__
218 /* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
219 That was relevant to code that was here before. */
220 #if !defined (__STDC__) || !__STDC__
221 /* gcc with -traditional declares the built-in strlen to return int,
222 and has done so at least since version 2.4.5. -- rms. */
223 extern int strlen (const char *);
224 #endif /* not __STDC__ */
225 #endif /* __GNUC__ */
227 #endif /* not __GNU_LIBRARY__ */
229 /* Handle permutation of arguments. */
231 /* Describe the part of ARGV that contains non-options that have
232 been skipped. `first_nonopt' is the index in ARGV of the first of them;
233 `last_nonopt' is the index after the last of them. */
235 static int first_nonopt;
236 static int last_nonopt;
238 /* Bash 2.0 gives us an environment variable containing flags
239 indicating ARGV elements that should not be considered arguments. */
241 static const char *nonoption_flags;
242 static int nonoption_flags_len;
244 /* Exchange two adjacent subsequences of ARGV.
245 One subsequence is elements [first_nonopt,last_nonopt)
246 which contains all the non-options that have been skipped so far.
247 The other is elements [last_nonopt,optind), which contains all
248 the options processed since those non-options were skipped.
250 `first_nonopt' and `last_nonopt' are relocated so that they describe
251 the new indices of the non-options in ARGV after they are moved. */
253 #if defined (__STDC__) && __STDC__
254 static void exchange (char **);
255 #endif
257 static void
258 exchange (argv)
259 char **argv;
261 int bottom = first_nonopt;
262 int middle = last_nonopt;
263 int top = optind;
264 char *tem;
266 /* Exchange the shorter segment with the far end of the longer segment.
267 That puts the shorter segment into the right place.
268 It leaves the longer segment in the right place overall,
269 but it consists of two parts that need to be swapped next. */
271 while (top > middle && middle > bottom)
273 if (top - middle > middle - bottom)
275 /* Bottom segment is the short one. */
276 int len = middle - bottom;
277 register int i;
279 /* Swap it with the top part of the top segment. */
280 for (i = 0; i < len; i++)
282 tem = argv[bottom + i];
283 argv[bottom + i] = argv[top - (middle - bottom) + i];
284 argv[top - (middle - bottom) + i] = tem;
286 /* Exclude the moved bottom segment from further swapping. */
287 top -= len;
289 else
291 /* Top segment is the short one. */
292 int len = top - middle;
293 register int i;
295 /* Swap it with the bottom part of the bottom segment. */
296 for (i = 0; i < len; i++)
298 tem = argv[bottom + i];
299 argv[bottom + i] = argv[middle + i];
300 argv[middle + i] = tem;
302 /* Exclude the moved top segment from further swapping. */
303 bottom += len;
307 /* Update records for the slots the non-options now occupy. */
309 first_nonopt += (optind - last_nonopt);
310 last_nonopt = optind;
313 /* Initialize the internal data when the first call is made. */
315 #if defined (__STDC__) && __STDC__
316 static const char *_getopt_initialize (const char *);
317 #endif
318 static const char *
319 _getopt_initialize (optstring)
320 const char *optstring;
322 /* Start processing options with ARGV-element 1 (since ARGV-element 0
323 is the program name); the sequence of previously skipped
324 non-option ARGV-elements is empty. */
326 first_nonopt = last_nonopt = optind = 1;
328 nextchar = NULL;
330 posixly_correct = getenv ("POSIXLY_CORRECT");
332 /* Determine how to handle the ordering of options and nonoptions. */
334 if (optstring[0] == '-')
336 ordering = RETURN_IN_ORDER;
337 ++optstring;
339 else if (optstring[0] == '+')
341 ordering = REQUIRE_ORDER;
342 ++optstring;
344 else if (posixly_correct != NULL)
345 ordering = REQUIRE_ORDER;
346 else
347 ordering = PERMUTE;
349 if (posixly_correct == NULL)
351 /* Bash 2.0 puts a special variable in the environment for each
352 command it runs, specifying which ARGV elements are the results of
353 file name wildcard expansion and therefore should not be
354 considered as options. */
355 char var[100];
356 sprintf (var, "_%d_GNU_nonoption_argv_flags_", getpid ());
357 nonoption_flags = getenv (var);
358 if (nonoption_flags == NULL)
359 nonoption_flags_len = 0;
360 else
361 nonoption_flags_len = strlen (nonoption_flags);
364 return optstring;
367 /* Scan elements of ARGV (whose length is ARGC) for option characters
368 given in OPTSTRING.
370 If an element of ARGV starts with '-', and is not exactly "-" or "--",
371 then it is an option element. The characters of this element
372 (aside from the initial '-') are option characters. If `getopt'
373 is called repeatedly, it returns successively each of the option characters
374 from each of the option elements.
376 If `getopt' finds another option character, it returns that character,
377 updating `optind' and `nextchar' so that the next call to `getopt' can
378 resume the scan with the following option character or ARGV-element.
380 If there are no more option characters, `getopt' returns `EOF'.
381 Then `optind' is the index in ARGV of the first ARGV-element
382 that is not an option. (The ARGV-elements have been permuted
383 so that those that are not options now come last.)
385 OPTSTRING is a string containing the legitimate option characters.
386 If an option character is seen that is not listed in OPTSTRING,
387 return '?' after printing an error message. If you set `opterr' to
388 zero, the error message is suppressed but we still return '?'.
390 If a char in OPTSTRING is followed by a colon, that means it wants an arg,
391 so the following text in the same ARGV-element, or the text of the following
392 ARGV-element, is returned in `optarg'. Two colons mean an option that
393 wants an optional arg; if there is text in the current ARGV-element,
394 it is returned in `optarg', otherwise `optarg' is set to zero.
396 If OPTSTRING starts with `-' or `+', it requests different methods of
397 handling the non-option ARGV-elements.
398 See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
400 Long-named options begin with `--' instead of `-'.
401 Their names may be abbreviated as long as the abbreviation is unique
402 or is an exact match for some defined option. If they have an
403 argument, it follows the option name in the same ARGV-element, separated
404 from the option name by a `=', or else the in next ARGV-element.
405 When `getopt' finds a long-named option, it returns 0 if that option's
406 `flag' field is nonzero, the value of the option's `val' field
407 if the `flag' field is zero.
409 The elements of ARGV aren't really const, because we permute them.
410 But we pretend they're const in the prototype to be compatible
411 with other systems.
413 LONGOPTS is a vector of `struct option' terminated by an
414 element containing a name which is zero.
416 LONGIND returns the index in LONGOPT of the long-named option found.
417 It is only valid when a long-named option has been found by the most
418 recent call.
420 If LONG_ONLY is nonzero, '-' as well as '--' can introduce
421 long-named options. */
424 _getopt_internal (argc, argv, optstring, longopts, longind, long_only)
425 int argc;
426 char *const *argv;
427 const char *optstring;
428 const struct option *longopts;
429 int *longind;
430 int long_only;
432 optarg = NULL;
434 if (optind == 0)
436 optstring = _getopt_initialize (optstring);
437 optind = 1; /* Don't scan ARGV[0], the program name. */
440 /* Test whether ARGV[optind] points to a non-option argument.
441 Either it does not have option syntax, or there is an environment flag
442 from the shell indicating it is not an option. */
443 #define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0' \
444 || (optind < nonoption_flags_len \
445 && nonoption_flags[optind] == '1'))
447 if (nextchar == NULL || *nextchar == '\0')
449 /* Advance to the next ARGV-element. */
451 /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been
452 moved back by the user (who may also have changed the arguments). */
453 if (last_nonopt > optind)
454 last_nonopt = optind;
455 if (first_nonopt > optind)
456 first_nonopt = optind;
458 if (ordering == PERMUTE)
460 /* If we have just processed some options following some non-options,
461 exchange them so that the options come first. */
463 if (first_nonopt != last_nonopt && last_nonopt != optind)
464 exchange ((char **) argv);
465 else if (last_nonopt != optind)
466 first_nonopt = optind;
468 /* Skip any additional non-options
469 and extend the range of non-options previously skipped. */
471 while (optind < argc && NONOPTION_P)
472 optind++;
473 last_nonopt = optind;
476 /* The special ARGV-element `--' means premature end of options.
477 Skip it like a null option,
478 then exchange with previous non-options as if it were an option,
479 then skip everything else like a non-option. */
481 if (optind != argc && !strcmp (argv[optind], "--"))
483 optind++;
485 if (first_nonopt != last_nonopt && last_nonopt != optind)
486 exchange ((char **) argv);
487 else if (first_nonopt == last_nonopt)
488 first_nonopt = optind;
489 last_nonopt = argc;
491 optind = argc;
494 /* If we have done all the ARGV-elements, stop the scan
495 and back over any non-options that we skipped and permuted. */
497 if (optind == argc)
499 /* Set the next-arg-index to point at the non-options
500 that we previously skipped, so the caller will digest them. */
501 if (first_nonopt != last_nonopt)
502 optind = first_nonopt;
503 return EOF;
506 /* If we have come to a non-option and did not permute it,
507 either stop the scan or describe it to the caller and pass it by. */
509 if (NONOPTION_P)
511 if (ordering == REQUIRE_ORDER)
512 return EOF;
513 optarg = argv[optind++];
514 return 1;
517 /* We have found another option-ARGV-element.
518 Skip the initial punctuation. */
520 nextchar = (argv[optind] + 1
521 + (longopts != NULL && argv[optind][1] == '-'));
524 /* Decode the current option-ARGV-element. */
526 /* Check whether the ARGV-element is a long option.
528 If long_only and the ARGV-element has the form "-f", where f is
529 a valid short option, don't consider it an abbreviated form of
530 a long option that starts with f. Otherwise there would be no
531 way to give the -f short option.
533 On the other hand, if there's a long option "fubar" and
534 the ARGV-element is "-fu", do consider that an abbreviation of
535 the long option, just like "--fu", and not "-f" with arg "u".
537 This distinction seems to be the most useful approach. */
539 if (longopts != NULL
540 && (argv[optind][1] == '-'
541 || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))
543 char *nameend;
544 const struct option *p;
545 const struct option *pfound = NULL;
546 int exact = 0;
547 int ambig = 0;
548 int indfound = -1;
549 int option_index;
551 for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
552 /* Do nothing. */ ;
554 /* Test all long options for either exact match
555 or abbreviated matches. */
556 for (p = longopts, option_index = 0; p->name; p++, option_index++)
557 if (!strncmp (p->name, nextchar, nameend - nextchar))
559 if ((unsigned int) (nameend - nextchar)
560 == (unsigned int) strlen (p->name))
562 /* Exact match found. */
563 pfound = p;
564 indfound = option_index;
565 exact = 1;
566 break;
568 else if (pfound == NULL)
570 /* First nonexact match found. */
571 pfound = p;
572 indfound = option_index;
574 else
575 /* Second or later nonexact match found. */
576 ambig = 1;
579 if (ambig && !exact)
581 if (opterr)
582 fprintf (stderr, _("%s: option `%s' is ambiguous\n"),
583 argv[0], argv[optind]);
584 nextchar += strlen (nextchar);
585 optind++;
586 optopt = 0;
587 return '?';
590 if (pfound != NULL)
592 option_index = indfound;
593 optind++;
594 if (*nameend)
596 /* Don't test has_arg with >, because some C compilers don't
597 allow it to be used on enums. */
598 if (pfound->has_arg)
599 optarg = nameend + 1;
600 else
602 if (opterr)
603 if (argv[optind - 1][1] == '-')
604 /* --option */
605 fprintf (stderr,
606 _("%s: option `--%s' doesn't allow an argument\n"),
607 argv[0], pfound->name);
608 else
609 /* +option or -option */
610 fprintf (stderr,
611 _("%s: option `%c%s' doesn't allow an argument\n"),
612 argv[0], argv[optind - 1][0], pfound->name);
614 nextchar += strlen (nextchar);
616 optopt = pfound->val;
617 return '?';
620 else if (pfound->has_arg == 1)
622 if (optind < argc)
623 optarg = argv[optind++];
624 else
626 if (opterr)
627 fprintf (stderr,
628 _("%s: option `%s' requires an argument\n"),
629 argv[0], argv[optind - 1]);
630 nextchar += strlen (nextchar);
631 optopt = pfound->val;
632 return optstring[0] == ':' ? ':' : '?';
635 nextchar += strlen (nextchar);
636 if (longind != NULL)
637 *longind = option_index;
638 if (pfound->flag)
640 *(pfound->flag) = pfound->val;
641 return 0;
643 return pfound->val;
646 /* Can't find it as a long option. If this is not getopt_long_only,
647 or the option starts with '--' or is not a valid short
648 option, then it's an error.
649 Otherwise interpret it as a short option. */
650 if (!long_only || argv[optind][1] == '-'
651 || my_index (optstring, *nextchar) == NULL)
653 if (opterr)
655 if (argv[optind][1] == '-')
656 /* --option */
657 fprintf (stderr, _("%s: unrecognized option `--%s'\n"),
658 argv[0], nextchar);
659 else
660 /* +option or -option */
661 fprintf (stderr, _("%s: unrecognized option `%c%s'\n"),
662 argv[0], argv[optind][0], nextchar);
664 nextchar = (char *) "";
665 optind++;
666 optopt = 0;
667 return '?';
671 /* Look at and handle the next short option-character. */
674 char c = *nextchar++;
675 char *temp = my_index (optstring, c);
677 /* Increment `optind' when we start to process its last character. */
678 if (*nextchar == '\0')
679 ++optind;
681 if (temp == NULL || c == ':')
683 if (opterr)
685 if (posixly_correct)
686 /* 1003.2 specifies the format of this message. */
687 fprintf (stderr, _("%s: illegal option -- %c\n"),
688 argv[0], c);
689 else
690 fprintf (stderr, _("%s: invalid option -- %c\n"),
691 argv[0], c);
693 optopt = c;
694 return '?';
696 /* Convenience. Treat POSIX -W foo same as long option --foo */
697 if (temp[0] == 'W' && temp[1] == ';')
699 char *nameend;
700 const struct option *p;
701 const struct option *pfound = NULL;
702 int exact = 0;
703 int ambig = 0;
704 int indfound = 0;
705 int option_index;
707 /* This is an option that requires an argument. */
708 if (*nextchar != '\0')
710 optarg = nextchar;
711 /* If we end this ARGV-element by taking the rest as an arg,
712 we must advance to the next element now. */
713 optind++;
715 else if (optind == argc)
717 if (opterr)
719 /* 1003.2 specifies the format of this message. */
720 fprintf (stderr,
721 gettext ("%s: option requires an argument -- %c\n"),
722 argv[0], c);
724 optopt = c;
725 if (optstring[0] == ':')
726 c = ':';
727 else
728 c = '?';
730 else
731 /* We already incremented `optind' once;
732 increment it again when taking next ARGV-elt as argument. */
733 optarg = argv[optind++];
735 /* optarg is now the argument, see if it's in the
736 table of longopts. */
738 for (nextchar = nameend = optarg; *nameend && *nameend != '='; nameend++)
739 /* Do nothing. */ ;
741 /* Test all long options for either exact match
742 or abbreviated matches. */
743 for (p = longopts, option_index = 0; p->name; p++, option_index++)
744 if (!strncmp (p->name, nextchar, nameend - nextchar))
746 if ((unsigned int) (nameend - nextchar) == strlen (p->name))
748 /* Exact match found. */
749 pfound = p;
750 indfound = option_index;
751 exact = 1;
752 break;
754 else if (pfound == NULL)
756 /* First nonexact match found. */
757 pfound = p;
758 indfound = option_index;
760 else
761 /* Second or later nonexact match found. */
762 ambig = 1;
764 if (ambig && !exact)
766 if (opterr)
767 fprintf (stderr, gettext ("%s: option `-W %s' is ambiguous\n"),
768 argv[0], argv[optind]);
769 nextchar += strlen (nextchar);
770 optind++;
771 return '?';
773 if (pfound != NULL)
775 option_index = indfound;
776 if (*nameend)
778 /* Don't test has_arg with >, because some C compilers don't
779 allow it to be used on enums. */
780 if (pfound->has_arg)
781 optarg = nameend + 1;
782 else
784 if (opterr)
785 fprintf (stderr,
786 gettext ("%s: option `-W %s' doesn't allow an argument\n"),
787 argv[0], pfound->name);
789 nextchar += strlen (nextchar);
790 return '?';
793 else if (pfound->has_arg == 1)
795 if (optind < argc)
796 optarg = argv[optind++];
797 else
799 if (opterr)
800 fprintf (stderr,
801 gettext ("%s: option `%s' requires an argument\n"),
802 argv[0], argv[optind - 1]);
803 nextchar += strlen (nextchar);
804 return optstring[0] == ':' ? ':' : '?';
807 nextchar += strlen (nextchar);
808 if (longind != NULL)
809 *longind = option_index;
810 if (pfound->flag)
812 *(pfound->flag) = pfound->val;
813 return 0;
815 return pfound->val;
817 nextchar = NULL;
818 return 'W'; /* Let the application handle it. */
820 if (temp[1] == ':')
822 if (temp[2] == ':')
824 /* This is an option that accepts an argument optionally. */
825 if (*nextchar != '\0')
827 optarg = nextchar;
828 optind++;
830 else
831 optarg = NULL;
832 nextchar = NULL;
834 else
836 /* This is an option that requires an argument. */
837 if (*nextchar != '\0')
839 optarg = nextchar;
840 /* If we end this ARGV-element by taking the rest as an arg,
841 we must advance to the next element now. */
842 optind++;
844 else if (optind == argc)
846 if (opterr)
848 /* 1003.2 specifies the format of this message. */
849 fprintf (stderr,
850 _("%s: option requires an argument -- %c\n"),
851 argv[0], c);
853 optopt = c;
854 if (optstring[0] == ':')
855 c = ':';
856 else
857 c = '?';
859 else
860 /* We already incremented `optind' once;
861 increment it again when taking next ARGV-elt as argument. */
862 optarg = argv[optind++];
863 nextchar = NULL;
866 return c;
871 getopt (argc, argv, optstring)
872 int argc;
873 char *const *argv;
874 const char *optstring;
876 return _getopt_internal (argc, argv, optstring,
877 (const struct option *) 0,
878 (int *) 0,
882 #endif /* _LIBC or not __GNU_LIBRARY__. */
884 #ifdef TEST
886 /* Compile with -DTEST to make an executable for use in testing
887 the above definition of `getopt'. */
890 main (argc, argv)
891 int argc;
892 char **argv;
894 int c;
895 int digit_optind = 0;
897 while (1)
899 int this_option_optind = optind ? optind : 1;
901 c = getopt (argc, argv, "abc:d:0123456789");
902 if (c == EOF)
903 break;
905 switch (c)
907 case '0':
908 case '1':
909 case '2':
910 case '3':
911 case '4':
912 case '5':
913 case '6':
914 case '7':
915 case '8':
916 case '9':
917 if (digit_optind != 0 && digit_optind != this_option_optind)
918 printf ("digits occur in two different argv-elements.\n");
919 digit_optind = this_option_optind;
920 printf ("option %c\n", c);
921 break;
923 case 'a':
924 printf ("option a\n");
925 break;
927 case 'b':
928 printf ("option b\n");
929 break;
931 case 'c':
932 printf ("option c with value `%s'\n", optarg);
933 break;
935 case '?':
936 break;
938 default:
939 printf ("?? getopt returned character code 0%o ??\n", c);
943 if (optind < argc)
945 printf ("non-option ARGV-elements: ");
946 while (optind < argc)
947 printf ("%s ", argv[optind++]);
948 printf ("\n");
951 exit (0);
954 #endif /* TEST */