Keep the command line on the heap to avoid stack overflow.
[make.git] / getopt.c
blobd069d384123edd791255fe7b35267f6c0e919f41
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!
6 Copyright (C) 1987-2012 Free Software Foundation, Inc.
8 NOTE: The canonical source of this file is maintained with the GNU C Library.
9 Bugs can be reported to bug-glibc@gnu.org.
11 GNU Make is free software; you can redistribute it and/or modify it under the
12 terms of the GNU General Public License as published by the Free Software
13 Foundation; either version 3 of the License, or (at your option) any later
14 version.
16 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
17 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
18 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License along with
21 this program. If not, see <http://www.gnu.org/licenses/>. */
23 /* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.
24 Ditto for AIX 3.2 and <stdlib.h>. */
25 #ifndef _NO_PROTO
26 # define _NO_PROTO
27 #endif
29 #ifdef HAVE_CONFIG_H
30 # include <config.h>
31 #endif
33 #if !defined __STDC__ || !__STDC__
34 /* This is a separate conditional since some stdc systems
35 reject `defined (const)'. */
36 # ifndef const
37 # define const
38 # endif
39 #endif
41 #include <stdio.h>
43 /* Comment out all this code if we are using the GNU C Library, and are not
44 actually compiling the library itself. This code is part of the GNU C
45 Library, but also included in many other GNU distributions. Compiling
46 and linking in this code is a waste when using the GNU C library
47 (especially if it is a shared library). Rather than having every GNU
48 program understand `configure --with-gnu-libc' and omit the object files,
49 it is simpler to just do this in the source for each such file. */
51 #define GETOPT_INTERFACE_VERSION 2
52 #if !defined _LIBC && defined __GLIBC__ && __GLIBC__ >= 2
53 # include <gnu-versions.h>
54 # if _GNU_GETOPT_INTERFACE_VERSION == GETOPT_INTERFACE_VERSION
55 # define ELIDE_CODE
56 # endif
57 #endif
59 #ifndef ELIDE_CODE
62 /* This needs to come after some library #include
63 to get __GNU_LIBRARY__ defined. */
64 #ifdef __GNU_LIBRARY__
65 /* Don't include stdlib.h for non-GNU C libraries because some of them
66 contain conflicting prototypes for getopt. */
67 # include <stdlib.h>
68 # include <unistd.h>
69 #endif /* GNU C library. */
71 #ifdef VMS
72 # include <unixlib.h>
73 # if HAVE_STRING_H - 0
74 # include <string.h>
75 # endif
76 #endif
78 /* This is for other GNU distributions with internationalized messages.
79 When compiling libc, the _ macro is predefined. */
80 #include "gettext.h"
81 #define _(msgid) gettext (msgid)
84 /* This version of `getopt' appears to the caller like standard Unix 'getopt'
85 but it behaves differently for the user, since it allows the user
86 to intersperse the options with the other arguments.
88 As `getopt' works, it permutes the elements of ARGV so that,
89 when it is done, all the options precede everything else. Thus
90 all application programs are extended to handle flexible argument order.
92 Setting the environment variable POSIXLY_CORRECT disables permutation.
93 Then the behavior is completely standard.
95 GNU application programs can use a third alternative mode in which
96 they can distinguish the relative order of options and other arguments. */
98 #include "getopt.h"
100 /* For communication from `getopt' to the caller.
101 When `getopt' finds an option that takes an argument,
102 the argument value is returned here.
103 Also, when `ordering' is RETURN_IN_ORDER,
104 each non-option ARGV-element is returned here. */
106 char *optarg = NULL;
108 /* Index in ARGV of the next element to be scanned.
109 This is used for communication to and from the caller
110 and for communication between successive calls to `getopt'.
112 On entry to `getopt', zero means this is the first call; initialize.
114 When `getopt' returns -1, this is the index of the first of the
115 non-option elements that the caller should itself scan.
117 Otherwise, `optind' communicates from one call to the next
118 how much of ARGV has been scanned so far. */
120 /* 1003.2 says this must be 1 before any call. */
121 int optind = 1;
123 /* Formerly, initialization of getopt depended on optind==0, which
124 causes problems with re-calling getopt as programs generally don't
125 know that. */
127 int __getopt_initialized = 0;
129 /* The next char to be scanned in the option-element
130 in which the last option character we returned was found.
131 This allows us to pick up the scan where we left off.
133 If this is zero, or a null string, it means resume the scan
134 by advancing to the next ARGV-element. */
136 static char *nextchar;
138 /* Callers store zero here to inhibit the error message
139 for unrecognized options. */
141 int opterr = 1;
143 /* Set to an option character which was unrecognized.
144 This must be initialized on some systems to avoid linking in the
145 system's own getopt implementation. */
147 int optopt = '?';
149 /* Describe how to deal with options that follow non-option ARGV-elements.
151 If the caller did not specify anything,
152 the default is REQUIRE_ORDER if the environment variable
153 POSIXLY_CORRECT is defined, PERMUTE otherwise.
155 REQUIRE_ORDER means don't recognize them as options;
156 stop option processing when the first non-option is seen.
157 This is what Unix does.
158 This mode of operation is selected by either setting the environment
159 variable POSIXLY_CORRECT, or using `+' as the first character
160 of the list of option characters.
162 PERMUTE is the default. We permute the contents of ARGV as we scan,
163 so that eventually all the non-options are at the end. This allows options
164 to be given in any order, even with programs that were not written to
165 expect this.
167 RETURN_IN_ORDER is an option available to programs that were written
168 to expect options and other ARGV-elements in any order and that care about
169 the ordering of the two. We describe each non-option ARGV-element
170 as if it were the argument of an option with character code 1.
171 Using `-' as the first character of the list of option characters
172 selects this mode of operation.
174 The special argument `--' forces an end of option-scanning regardless
175 of the value of `ordering'. In the case of RETURN_IN_ORDER, only
176 `--' can cause `getopt' to return -1 with `optind' != ARGC. */
178 static enum
180 REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
181 } ordering;
183 /* Value of POSIXLY_CORRECT environment variable. */
184 static char *posixly_correct;
186 #ifdef __GNU_LIBRARY__
187 /* We want to avoid inclusion of string.h with non-GNU libraries
188 because there are many ways it can cause trouble.
189 On some systems, it contains special magic macros that don't work
190 in GCC. */
191 # include <string.h>
192 # define my_index strchr
193 #else
195 # if HAVE_STRING_H
196 # include <string.h>
197 # else
198 # include <strings.h>
199 # endif
201 /* Avoid depending on library functions or files
202 whose names are inconsistent. */
204 #ifndef getenv
205 extern char *getenv ();
206 #endif
208 static char *
209 my_index (const char *str, int chr)
211 while (*str)
213 if (*str == chr)
214 return (char *) str;
215 str++;
217 return 0;
220 /* If using GCC, we can safely declare strlen this way.
221 If not using GCC, it is ok not to declare it. */
222 #ifdef __GNUC__
223 /* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
224 That was relevant to code that was here before. */
225 # if (!defined __STDC__ || !__STDC__) && !defined strlen
226 /* gcc with -traditional declares the built-in strlen to return int,
227 and has done so at least since version 2.4.5. -- rms. */
228 extern int strlen (const char *);
229 # endif /* not __STDC__ */
230 #endif /* __GNUC__ */
232 #endif /* not __GNU_LIBRARY__ */
234 /* Handle permutation of arguments. */
236 /* Describe the part of ARGV that contains non-options that have
237 been skipped. `first_nonopt' is the index in ARGV of the first of them;
238 `last_nonopt' is the index after the last of them. */
240 static int first_nonopt;
241 static int last_nonopt;
243 #ifdef _LIBC
244 /* Bash 2.0 gives us an environment variable containing flags
245 indicating ARGV elements that should not be considered arguments. */
247 /* Defined in getopt_init.c */
248 extern char *__getopt_nonoption_flags;
250 static int nonoption_flags_max_len;
251 static int nonoption_flags_len;
253 static int original_argc;
254 static char *const *original_argv;
256 /* Make sure the environment variable bash 2.0 puts in the environment
257 is valid for the getopt call we must make sure that the ARGV passed
258 to getopt is that one passed to the process. */
259 static void __attribute__ ((unused))
260 store_args_and_env (int argc, char *const *argv)
262 /* XXX This is no good solution. We should rather copy the args so
263 that we can compare them later. But we must not use malloc(3). */
264 original_argc = argc;
265 original_argv = argv;
267 # ifdef text_set_element
268 text_set_element (__libc_subinit, store_args_and_env);
269 # endif /* text_set_element */
271 # define SWAP_FLAGS(ch1, ch2) \
272 if (nonoption_flags_len > 0) \
274 char __tmp = __getopt_nonoption_flags[ch1]; \
275 __getopt_nonoption_flags[ch1] = __getopt_nonoption_flags[ch2]; \
276 __getopt_nonoption_flags[ch2] = __tmp; \
278 #else /* !_LIBC */
279 # define SWAP_FLAGS(ch1, ch2)
280 #endif /* _LIBC */
282 /* Exchange two adjacent subsequences of ARGV.
283 One subsequence is elements [first_nonopt,last_nonopt)
284 which contains all the non-options that have been skipped so far.
285 The other is elements [last_nonopt,optind), which contains all
286 the options processed since those non-options were skipped.
288 `first_nonopt' and `last_nonopt' are relocated so that they describe
289 the new indices of the non-options in ARGV after they are moved. */
291 #if defined __STDC__ && __STDC__
292 static void exchange (char **);
293 #endif
295 static void
296 exchange (char **argv)
298 int bottom = first_nonopt;
299 int middle = last_nonopt;
300 int top = optind;
301 char *tem;
303 /* Exchange the shorter segment with the far end of the longer segment.
304 That puts the shorter segment into the right place.
305 It leaves the longer segment in the right place overall,
306 but it consists of two parts that need to be swapped next. */
308 #ifdef _LIBC
309 /* First make sure the handling of the `__getopt_nonoption_flags'
310 string can work normally. Our top argument must be in the range
311 of the string. */
312 if (nonoption_flags_len > 0 && top >= nonoption_flags_max_len)
314 /* We must extend the array. The user plays games with us and
315 presents new arguments. */
316 char *new_str = malloc (top + 1);
317 if (new_str == NULL)
318 nonoption_flags_len = nonoption_flags_max_len = 0;
319 else
321 memset (__mempcpy (new_str, __getopt_nonoption_flags,
322 nonoption_flags_max_len),
323 '\0', top + 1 - nonoption_flags_max_len);
324 nonoption_flags_max_len = top + 1;
325 __getopt_nonoption_flags = new_str;
328 #endif
330 while (top > middle && middle > bottom)
332 if (top - middle > middle - bottom)
334 /* Bottom segment is the short one. */
335 int len = middle - bottom;
336 register int i;
338 /* Swap it with the top part of the top segment. */
339 for (i = 0; i < len; i++)
341 tem = argv[bottom + i];
342 argv[bottom + i] = argv[top - (middle - bottom) + i];
343 argv[top - (middle - bottom) + i] = tem;
344 SWAP_FLAGS (bottom + i, top - (middle - bottom) + i);
346 /* Exclude the moved bottom segment from further swapping. */
347 top -= len;
349 else
351 /* Top segment is the short one. */
352 int len = top - middle;
353 register int i;
355 /* Swap it with the bottom part of the bottom segment. */
356 for (i = 0; i < len; i++)
358 tem = argv[bottom + i];
359 argv[bottom + i] = argv[middle + i];
360 argv[middle + i] = tem;
361 SWAP_FLAGS (bottom + i, middle + i);
363 /* Exclude the moved top segment from further swapping. */
364 bottom += len;
368 /* Update records for the slots the non-options now occupy. */
370 first_nonopt += (optind - last_nonopt);
371 last_nonopt = optind;
374 /* Initialize the internal data when the first call is made. */
376 #if defined __STDC__ && __STDC__
377 static const char *_getopt_initialize (int, char *const *, const char *);
378 #endif
379 static const char *
380 _getopt_initialize (int argc, char *const *argv, const char *optstring)
382 /* Start processing options with ARGV-element 1 (since ARGV-element 0
383 is the program name); the sequence of previously skipped
384 non-option ARGV-elements is empty. */
386 first_nonopt = last_nonopt = optind;
388 nextchar = NULL;
390 posixly_correct = getenv ("POSIXLY_CORRECT");
392 /* Determine how to handle the ordering of options and nonoptions. */
394 if (optstring[0] == '-')
396 ordering = RETURN_IN_ORDER;
397 ++optstring;
399 else if (optstring[0] == '+')
401 ordering = REQUIRE_ORDER;
402 ++optstring;
404 else if (posixly_correct != NULL)
405 ordering = REQUIRE_ORDER;
406 else
407 ordering = PERMUTE;
409 #ifdef _LIBC
410 if (posixly_correct == NULL
411 && argc == original_argc && argv == original_argv)
413 if (nonoption_flags_max_len == 0)
415 if (__getopt_nonoption_flags == NULL
416 || __getopt_nonoption_flags[0] == '\0')
417 nonoption_flags_max_len = -1;
418 else
420 const char *orig_str = __getopt_nonoption_flags;
421 int len = nonoption_flags_max_len = strlen (orig_str);
422 if (nonoption_flags_max_len < argc)
423 nonoption_flags_max_len = argc;
424 __getopt_nonoption_flags =
425 (char *) malloc (nonoption_flags_max_len);
426 if (__getopt_nonoption_flags == NULL)
427 nonoption_flags_max_len = -1;
428 else
429 memset (__mempcpy (__getopt_nonoption_flags, orig_str, len),
430 '\0', nonoption_flags_max_len - len);
433 nonoption_flags_len = nonoption_flags_max_len;
435 else
436 nonoption_flags_len = 0;
437 #endif
439 return optstring;
442 /* Scan elements of ARGV (whose length is ARGC) for option characters
443 given in OPTSTRING.
445 If an element of ARGV starts with '-', and is not exactly "-" or "--",
446 then it is an option element. The characters of this element
447 (aside from the initial '-') are option characters. If `getopt'
448 is called repeatedly, it returns successively each of the option characters
449 from each of the option elements.
451 If `getopt' finds another option character, it returns that character,
452 updating `optind' and `nextchar' so that the next call to `getopt' can
453 resume the scan with the following option character or ARGV-element.
455 If there are no more option characters, `getopt' returns -1.
456 Then `optind' is the index in ARGV of the first ARGV-element
457 that is not an option. (The ARGV-elements have been permuted
458 so that those that are not options now come last.)
460 OPTSTRING is a string containing the legitimate option characters.
461 If an option character is seen that is not listed in OPTSTRING,
462 return '?' after printing an error message. If you set `opterr' to
463 zero, the error message is suppressed but we still return '?'.
465 If a char in OPTSTRING is followed by a colon, that means it wants an arg,
466 so the following text in the same ARGV-element, or the text of the following
467 ARGV-element, is returned in `optarg'. Two colons mean an option that
468 wants an optional arg; if there is text in the current ARGV-element,
469 it is returned in `optarg', otherwise `optarg' is set to zero.
471 If OPTSTRING starts with `-' or `+', it requests different methods of
472 handling the non-option ARGV-elements.
473 See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
475 Long-named options begin with `--' instead of `-'.
476 Their names may be abbreviated as long as the abbreviation is unique
477 or is an exact match for some defined option. If they have an
478 argument, it follows the option name in the same ARGV-element, separated
479 from the option name by a `=', or else the in next ARGV-element.
480 When `getopt' finds a long-named option, it returns 0 if that option's
481 `flag' field is nonzero, the value of the option's `val' field
482 if the `flag' field is zero.
484 The elements of ARGV aren't really const, because we permute them.
485 But we pretend they're const in the prototype to be compatible
486 with other systems.
488 LONGOPTS is a vector of `struct option' terminated by an
489 element containing a name which is zero.
491 LONGIND returns the index in LONGOPT of the long-named option found.
492 It is only valid when a long-named option has been found by the most
493 recent call.
495 If LONG_ONLY is nonzero, '-' as well as '--' can introduce
496 long-named options. */
499 _getopt_internal (int argc, char *const *argv, const char *optstring,
500 const struct option *longopts, int *longind, int long_only)
502 optarg = NULL;
504 if (optind == 0 || !__getopt_initialized)
506 if (optind == 0)
507 optind = 1; /* Don't scan ARGV[0], the program name. */
508 optstring = _getopt_initialize (argc, argv, optstring);
509 __getopt_initialized = 1;
512 /* Test whether ARGV[optind] points to a non-option argument.
513 Either it does not have option syntax, or there is an environment flag
514 from the shell indicating it is not an option. The later information
515 is only used when the used in the GNU libc. */
516 #ifdef _LIBC
517 # define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0' \
518 || (optind < nonoption_flags_len \
519 && __getopt_nonoption_flags[optind] == '1'))
520 #else
521 # define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0')
522 #endif
524 if (nextchar == NULL || *nextchar == '\0')
526 /* Advance to the next ARGV-element. */
528 /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been
529 moved back by the user (who may also have changed the arguments). */
530 if (last_nonopt > optind)
531 last_nonopt = optind;
532 if (first_nonopt > optind)
533 first_nonopt = optind;
535 if (ordering == PERMUTE)
537 /* If we have just processed some options following some non-options,
538 exchange them so that the options come first. */
540 if (first_nonopt != last_nonopt && last_nonopt != optind)
541 exchange ((char **) argv);
542 else if (last_nonopt != optind)
543 first_nonopt = optind;
545 /* Skip any additional non-options
546 and extend the range of non-options previously skipped. */
548 while (optind < argc && NONOPTION_P)
549 optind++;
550 last_nonopt = optind;
553 /* The special ARGV-element `--' means premature end of options.
554 Skip it like a null option,
555 then exchange with previous non-options as if it were an option,
556 then skip everything else like a non-option. */
558 if (optind != argc && !strcmp (argv[optind], "--"))
560 optind++;
562 if (first_nonopt != last_nonopt && last_nonopt != optind)
563 exchange ((char **) argv);
564 else if (first_nonopt == last_nonopt)
565 first_nonopt = optind;
566 last_nonopt = argc;
568 optind = argc;
571 /* If we have done all the ARGV-elements, stop the scan
572 and back over any non-options that we skipped and permuted. */
574 if (optind == argc)
576 /* Set the next-arg-index to point at the non-options
577 that we previously skipped, so the caller will digest them. */
578 if (first_nonopt != last_nonopt)
579 optind = first_nonopt;
580 return -1;
583 /* If we have come to a non-option and did not permute it,
584 either stop the scan or describe it to the caller and pass it by. */
586 if (NONOPTION_P)
588 if (ordering == REQUIRE_ORDER)
589 return -1;
590 optarg = argv[optind++];
591 return 1;
594 /* We have found another option-ARGV-element.
595 Skip the initial punctuation. */
597 nextchar = (argv[optind] + 1
598 + (longopts != NULL && argv[optind][1] == '-'));
601 /* Decode the current option-ARGV-element. */
603 /* Check whether the ARGV-element is a long option.
605 If long_only and the ARGV-element has the form "-f", where f is
606 a valid short option, don't consider it an abbreviated form of
607 a long option that starts with f. Otherwise there would be no
608 way to give the -f short option.
610 On the other hand, if there's a long option "fubar" and
611 the ARGV-element is "-fu", do consider that an abbreviation of
612 the long option, just like "--fu", and not "-f" with arg "u".
614 This distinction seems to be the most useful approach. */
616 if (longopts != NULL
617 && (argv[optind][1] == '-'
618 || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))
620 char *nameend;
621 const struct option *p;
622 const struct option *pfound = NULL;
623 int exact = 0;
624 int ambig = 0;
625 int indfound = -1;
626 int option_index;
628 for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
629 /* Do nothing. */ ;
631 /* Test all long options for either exact match
632 or abbreviated matches. */
633 for (p = longopts, option_index = 0; p->name; p++, option_index++)
634 if (!strncmp (p->name, nextchar, nameend - nextchar))
636 if ((unsigned int) (nameend - nextchar)
637 == (unsigned int) strlen (p->name))
639 /* Exact match found. */
640 pfound = p;
641 indfound = option_index;
642 exact = 1;
643 break;
645 else if (pfound == NULL)
647 /* First nonexact match found. */
648 pfound = p;
649 indfound = option_index;
651 else
652 /* Second or later nonexact match found. */
653 ambig = 1;
656 if (ambig && !exact)
658 if (opterr)
659 fprintf (stderr, _("%s: option '%s' is ambiguous\n"),
660 argv[0], argv[optind]);
661 nextchar += strlen (nextchar);
662 optind++;
663 optopt = 0;
664 return '?';
667 if (pfound != NULL)
669 option_index = indfound;
670 optind++;
671 if (*nameend)
673 /* Don't test has_arg with >, because some C compilers don't
674 allow it to be used on enums. */
675 if (pfound->has_arg)
676 optarg = nameend + 1;
677 else
679 if (opterr)
680 if (argv[optind - 1][1] == '-')
681 /* --option */
682 fprintf (stderr,
683 _("%s: option '--%s' doesn't allow an argument\n"),
684 argv[0], pfound->name);
685 else
686 /* +option or -option */
687 fprintf (stderr,
688 _("%s: option '%c%s' doesn't allow an argument\n"),
689 argv[0], argv[optind - 1][0], pfound->name);
691 nextchar += strlen (nextchar);
693 optopt = pfound->val;
694 return '?';
697 else if (pfound->has_arg == 1)
699 if (optind < argc)
700 optarg = argv[optind++];
701 else
703 if (opterr)
704 fprintf (stderr,
705 _("%s: option '%s' requires an argument\n"),
706 argv[0], argv[optind - 1]);
707 nextchar += strlen (nextchar);
708 optopt = pfound->val;
709 return optstring[0] == ':' ? ':' : '?';
712 nextchar += strlen (nextchar);
713 if (longind != NULL)
714 *longind = option_index;
715 if (pfound->flag)
717 *(pfound->flag) = pfound->val;
718 return 0;
720 return pfound->val;
723 /* Can't find it as a long option. If this is not getopt_long_only,
724 or the option starts with '--' or is not a valid short
725 option, then it's an error.
726 Otherwise interpret it as a short option. */
727 if (!long_only || argv[optind][1] == '-'
728 || my_index (optstring, *nextchar) == NULL)
730 if (opterr)
732 if (argv[optind][1] == '-')
733 /* --option */
734 fprintf (stderr, _("%s: unrecognized option '--%s'\n"),
735 argv[0], nextchar);
736 else
737 /* +option or -option */
738 fprintf (stderr, _("%s: unrecognized option '%c%s'\n"),
739 argv[0], argv[optind][0], nextchar);
741 nextchar = (char *) "";
742 optind++;
743 optopt = 0;
744 return '?';
748 /* Look at and handle the next short option-character. */
751 char c = *nextchar++;
752 char *temp = my_index (optstring, c);
754 /* Increment `optind' when we start to process its last character. */
755 if (*nextchar == '\0')
756 ++optind;
758 if (temp == NULL || c == ':')
760 if (opterr)
762 if (posixly_correct)
763 /* 1003.2 specifies the format of this message. */
764 fprintf (stderr, _("%s: illegal option -- %c\n"),
765 argv[0], c);
766 else
767 fprintf (stderr, _("%s: invalid option -- %c\n"),
768 argv[0], c);
770 optopt = c;
771 return '?';
773 /* Convenience. Treat POSIX -W foo same as long option --foo */
774 if (temp[0] == 'W' && temp[1] == ';')
776 char *nameend;
777 const struct option *p;
778 const struct option *pfound = NULL;
779 int exact = 0;
780 int ambig = 0;
781 int indfound = 0;
782 int option_index;
784 /* This is an option that requires an argument. */
785 if (*nextchar != '\0')
787 optarg = nextchar;
788 /* If we end this ARGV-element by taking the rest as an arg,
789 we must advance to the next element now. */
790 optind++;
792 else if (optind == argc)
794 if (opterr)
796 /* 1003.2 specifies the format of this message. */
797 fprintf (stderr, _("%s: option requires an argument -- %c\n"),
798 argv[0], c);
800 optopt = c;
801 if (optstring[0] == ':')
802 c = ':';
803 else
804 c = '?';
805 return c;
807 else
808 /* We already incremented `optind' once;
809 increment it again when taking next ARGV-elt as argument. */
810 optarg = argv[optind++];
812 /* optarg is now the argument, see if it's in the
813 table of longopts. */
815 for (nextchar = nameend = optarg; *nameend && *nameend != '='; nameend++)
816 /* Do nothing. */ ;
818 /* Test all long options for either exact match
819 or abbreviated matches. */
820 for (p = longopts, option_index = 0; p->name; p++, option_index++)
821 if (!strncmp (p->name, nextchar, nameend - nextchar))
823 if ((unsigned int) (nameend - nextchar) == strlen (p->name))
825 /* Exact match found. */
826 pfound = p;
827 indfound = option_index;
828 exact = 1;
829 break;
831 else if (pfound == NULL)
833 /* First nonexact match found. */
834 pfound = p;
835 indfound = option_index;
837 else
838 /* Second or later nonexact match found. */
839 ambig = 1;
841 if (ambig && !exact)
843 if (opterr)
844 fprintf (stderr, _("%s: option '-W %s' is ambiguous\n"),
845 argv[0], argv[optind]);
846 nextchar += strlen (nextchar);
847 optind++;
848 return '?';
850 if (pfound != NULL)
852 option_index = indfound;
853 if (*nameend)
855 /* Don't test has_arg with >, because some C compilers don't
856 allow it to be used on enums. */
857 if (pfound->has_arg)
858 optarg = nameend + 1;
859 else
861 if (opterr)
862 fprintf (stderr, _("\
863 %s: option '-W %s' doesn't allow an argument\n"),
864 argv[0], pfound->name);
866 nextchar += strlen (nextchar);
867 return '?';
870 else if (pfound->has_arg == 1)
872 if (optind < argc)
873 optarg = argv[optind++];
874 else
876 if (opterr)
877 fprintf (stderr,
878 _("%s: option '%s' requires an argument\n"),
879 argv[0], argv[optind - 1]);
880 nextchar += strlen (nextchar);
881 return optstring[0] == ':' ? ':' : '?';
884 nextchar += strlen (nextchar);
885 if (longind != NULL)
886 *longind = option_index;
887 if (pfound->flag)
889 *(pfound->flag) = pfound->val;
890 return 0;
892 return pfound->val;
894 nextchar = NULL;
895 return 'W'; /* Let the application handle it. */
897 if (temp[1] == ':')
899 if (temp[2] == ':')
901 /* This is an option that accepts an argument optionally. */
902 if (*nextchar != '\0')
904 optarg = nextchar;
905 optind++;
907 else
908 optarg = NULL;
909 nextchar = NULL;
911 else
913 /* This is an option that requires an argument. */
914 if (*nextchar != '\0')
916 optarg = nextchar;
917 /* If we end this ARGV-element by taking the rest as an arg,
918 we must advance to the next element now. */
919 optind++;
921 else if (optind == argc)
923 if (opterr)
925 /* 1003.2 specifies the format of this message. */
926 fprintf (stderr,
927 _("%s: option requires an argument -- %c\n"),
928 argv[0], c);
930 optopt = c;
931 if (optstring[0] == ':')
932 c = ':';
933 else
934 c = '?';
936 else
937 /* We already incremented `optind' once;
938 increment it again when taking next ARGV-elt as argument. */
939 optarg = argv[optind++];
940 nextchar = NULL;
943 return c;
948 getopt (int argc, char *const *argv, const char *optstring)
950 return _getopt_internal (argc, argv, optstring,
951 (const struct option *) 0,
952 (int *) 0,
956 #endif /* Not ELIDE_CODE. */
958 #ifdef TEST
960 /* Compile with -DTEST to make an executable for use in testing
961 the above definition of `getopt'. */
964 main (int argc, char **argv)
966 int c;
967 int digit_optind = 0;
969 while (1)
971 int this_option_optind = optind ? optind : 1;
973 c = getopt (argc, argv, "abc:d:0123456789");
974 if (c == -1)
975 break;
977 switch (c)
979 case '0':
980 case '1':
981 case '2':
982 case '3':
983 case '4':
984 case '5':
985 case '6':
986 case '7':
987 case '8':
988 case '9':
989 if (digit_optind != 0 && digit_optind != this_option_optind)
990 printf ("digits occur in two different argv-elements.\n");
991 digit_optind = this_option_optind;
992 printf ("option %c\n", c);
993 break;
995 case 'a':
996 printf ("option a\n");
997 break;
999 case 'b':
1000 printf ("option b\n");
1001 break;
1003 case 'c':
1004 printf ("option c with value '%s'\n", optarg);
1005 break;
1007 case '?':
1008 break;
1010 default:
1011 printf ("?? getopt returned character code 0%o ??\n", c);
1015 if (optind < argc)
1017 printf ("non-option ARGV-elements: ");
1018 while (optind < argc)
1019 printf ("%s ", argv[optind++]);
1020 printf ("\n");
1023 exit (0);
1026 #endif /* TEST */