Create a new internal interface for defining new make functions.
[make.git] / getopt.c
blob03450392155314d3f9ed249acb69104d290cec2b
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, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
7 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011,
8 2012 Free Software Foundation, Inc.
10 NOTE: The canonical source of this file is maintained with the GNU C Library.
11 Bugs can be reported to bug-glibc@gnu.org.
13 GNU Make is free software; you can redistribute it and/or modify it under the
14 terms of the GNU General Public License as published by the Free Software
15 Foundation; either version 3 of the License, or (at your option) any later
16 version.
18 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
19 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
20 A PARTICULAR PURPOSE. See the GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License along with
23 this program. If not, see <http://www.gnu.org/licenses/>. */
25 /* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.
26 Ditto for AIX 3.2 and <stdlib.h>. */
27 #ifndef _NO_PROTO
28 # define _NO_PROTO
29 #endif
31 #ifdef HAVE_CONFIG_H
32 # include <config.h>
33 #endif
35 #if !defined __STDC__ || !__STDC__
36 /* This is a separate conditional since some stdc systems
37 reject `defined (const)'. */
38 # ifndef const
39 # define const
40 # endif
41 #endif
43 #include <stdio.h>
45 /* Comment out all this code if we are using the GNU C Library, and are not
46 actually compiling the library itself. This code is part of the GNU C
47 Library, but also included in many other GNU distributions. Compiling
48 and linking in this code is a waste when using the GNU C library
49 (especially if it is a shared library). Rather than having every GNU
50 program understand `configure --with-gnu-libc' and omit the object files,
51 it is simpler to just do this in the source for each such file. */
53 #define GETOPT_INTERFACE_VERSION 2
54 #if !defined _LIBC && defined __GLIBC__ && __GLIBC__ >= 2
55 # include <gnu-versions.h>
56 # if _GNU_GETOPT_INTERFACE_VERSION == GETOPT_INTERFACE_VERSION
57 # define ELIDE_CODE
58 # endif
59 #endif
61 #ifndef ELIDE_CODE
64 /* This needs to come after some library #include
65 to get __GNU_LIBRARY__ defined. */
66 #ifdef __GNU_LIBRARY__
67 /* Don't include stdlib.h for non-GNU C libraries because some of them
68 contain conflicting prototypes for getopt. */
69 # include <stdlib.h>
70 # include <unistd.h>
71 #endif /* GNU C library. */
73 #ifdef VMS
74 # include <unixlib.h>
75 # if HAVE_STRING_H - 0
76 # include <string.h>
77 # endif
78 #endif
80 /* This is for other GNU distributions with internationalized messages.
81 When compiling libc, the _ macro is predefined. */
82 #include "gettext.h"
83 #define _(msgid) gettext (msgid)
86 /* This version of `getopt' appears to the caller like standard Unix `getopt'
87 but it behaves differently for the user, since it allows the user
88 to intersperse the options with the other arguments.
90 As `getopt' works, it permutes the elements of ARGV so that,
91 when it is done, all the options precede everything else. Thus
92 all application programs are extended to handle flexible argument order.
94 Setting the environment variable POSIXLY_CORRECT disables permutation.
95 Then the behavior is completely standard.
97 GNU application programs can use a third alternative mode in which
98 they can distinguish the relative order of options and other arguments. */
100 #include "getopt.h"
102 /* For communication from `getopt' to the caller.
103 When `getopt' finds an option that takes an argument,
104 the argument value is returned here.
105 Also, when `ordering' is RETURN_IN_ORDER,
106 each non-option ARGV-element is returned here. */
108 char *optarg = NULL;
110 /* Index in ARGV of the next element to be scanned.
111 This is used for communication to and from the caller
112 and for communication between successive calls to `getopt'.
114 On entry to `getopt', zero means this is the first call; initialize.
116 When `getopt' returns -1, this is the index of the first of the
117 non-option elements that the caller should itself scan.
119 Otherwise, `optind' communicates from one call to the next
120 how much of ARGV has been scanned so far. */
122 /* 1003.2 says this must be 1 before any call. */
123 int optind = 1;
125 /* Formerly, initialization of getopt depended on optind==0, which
126 causes problems with re-calling getopt as programs generally don't
127 know that. */
129 int __getopt_initialized = 0;
131 /* The next char to be scanned in the option-element
132 in which the last option character we returned was found.
133 This allows us to pick up the scan where we left off.
135 If this is zero, or a null string, it means resume the scan
136 by advancing to the next ARGV-element. */
138 static char *nextchar;
140 /* Callers store zero here to inhibit the error message
141 for unrecognized options. */
143 int opterr = 1;
145 /* Set to an option character which was unrecognized.
146 This must be initialized on some systems to avoid linking in the
147 system's own getopt implementation. */
149 int optopt = '?';
151 /* Describe how to deal with options that follow non-option ARGV-elements.
153 If the caller did not specify anything,
154 the default is REQUIRE_ORDER if the environment variable
155 POSIXLY_CORRECT is defined, PERMUTE otherwise.
157 REQUIRE_ORDER means don't recognize them as options;
158 stop option processing when the first non-option is seen.
159 This is what Unix does.
160 This mode of operation is selected by either setting the environment
161 variable POSIXLY_CORRECT, or using `+' as the first character
162 of the list of option characters.
164 PERMUTE is the default. We permute the contents of ARGV as we scan,
165 so that eventually all the non-options are at the end. This allows options
166 to be given in any order, even with programs that were not written to
167 expect this.
169 RETURN_IN_ORDER is an option available to programs that were written
170 to expect options and other ARGV-elements in any order and that care about
171 the ordering of the two. We describe each non-option ARGV-element
172 as if it were the argument of an option with character code 1.
173 Using `-' as the first character of the list of option characters
174 selects this mode of operation.
176 The special argument `--' forces an end of option-scanning regardless
177 of the value of `ordering'. In the case of RETURN_IN_ORDER, only
178 `--' can cause `getopt' to return -1 with `optind' != ARGC. */
180 static enum
182 REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
183 } ordering;
185 /* Value of POSIXLY_CORRECT environment variable. */
186 static char *posixly_correct;
188 #ifdef __GNU_LIBRARY__
189 /* We want to avoid inclusion of string.h with non-GNU libraries
190 because there are many ways it can cause trouble.
191 On some systems, it contains special magic macros that don't work
192 in GCC. */
193 # include <string.h>
194 # define my_index strchr
195 #else
197 # if HAVE_STRING_H
198 # include <string.h>
199 # else
200 # include <strings.h>
201 # endif
203 /* Avoid depending on library functions or files
204 whose names are inconsistent. */
206 #ifndef getenv
207 extern char *getenv ();
208 #endif
210 static char *
211 my_index (const char *str, int chr)
213 while (*str)
215 if (*str == chr)
216 return (char *) str;
217 str++;
219 return 0;
222 /* If using GCC, we can safely declare strlen this way.
223 If not using GCC, it is ok not to declare it. */
224 #ifdef __GNUC__
225 /* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
226 That was relevant to code that was here before. */
227 # if (!defined __STDC__ || !__STDC__) && !defined strlen
228 /* gcc with -traditional declares the built-in strlen to return int,
229 and has done so at least since version 2.4.5. -- rms. */
230 extern int strlen (const char *);
231 # endif /* not __STDC__ */
232 #endif /* __GNUC__ */
234 #endif /* not __GNU_LIBRARY__ */
236 /* Handle permutation of arguments. */
238 /* Describe the part of ARGV that contains non-options that have
239 been skipped. `first_nonopt' is the index in ARGV of the first of them;
240 `last_nonopt' is the index after the last of them. */
242 static int first_nonopt;
243 static int last_nonopt;
245 #ifdef _LIBC
246 /* Bash 2.0 gives us an environment variable containing flags
247 indicating ARGV elements that should not be considered arguments. */
249 /* Defined in getopt_init.c */
250 extern char *__getopt_nonoption_flags;
252 static int nonoption_flags_max_len;
253 static int nonoption_flags_len;
255 static int original_argc;
256 static char *const *original_argv;
258 /* Make sure the environment variable bash 2.0 puts in the environment
259 is valid for the getopt call we must make sure that the ARGV passed
260 to getopt is that one passed to the process. */
261 static void __attribute__ ((unused))
262 store_args_and_env (int argc, char *const *argv)
264 /* XXX This is no good solution. We should rather copy the args so
265 that we can compare them later. But we must not use malloc(3). */
266 original_argc = argc;
267 original_argv = argv;
269 # ifdef text_set_element
270 text_set_element (__libc_subinit, store_args_and_env);
271 # endif /* text_set_element */
273 # define SWAP_FLAGS(ch1, ch2) \
274 if (nonoption_flags_len > 0) \
276 char __tmp = __getopt_nonoption_flags[ch1]; \
277 __getopt_nonoption_flags[ch1] = __getopt_nonoption_flags[ch2]; \
278 __getopt_nonoption_flags[ch2] = __tmp; \
280 #else /* !_LIBC */
281 # define SWAP_FLAGS(ch1, ch2)
282 #endif /* _LIBC */
284 /* Exchange two adjacent subsequences of ARGV.
285 One subsequence is elements [first_nonopt,last_nonopt)
286 which contains all the non-options that have been skipped so far.
287 The other is elements [last_nonopt,optind), which contains all
288 the options processed since those non-options were skipped.
290 `first_nonopt' and `last_nonopt' are relocated so that they describe
291 the new indices of the non-options in ARGV after they are moved. */
293 #if defined __STDC__ && __STDC__
294 static void exchange (char **);
295 #endif
297 static void
298 exchange (char **argv)
300 int bottom = first_nonopt;
301 int middle = last_nonopt;
302 int top = optind;
303 char *tem;
305 /* Exchange the shorter segment with the far end of the longer segment.
306 That puts the shorter segment into the right place.
307 It leaves the longer segment in the right place overall,
308 but it consists of two parts that need to be swapped next. */
310 #ifdef _LIBC
311 /* First make sure the handling of the `__getopt_nonoption_flags'
312 string can work normally. Our top argument must be in the range
313 of the string. */
314 if (nonoption_flags_len > 0 && top >= nonoption_flags_max_len)
316 /* We must extend the array. The user plays games with us and
317 presents new arguments. */
318 char *new_str = malloc (top + 1);
319 if (new_str == NULL)
320 nonoption_flags_len = nonoption_flags_max_len = 0;
321 else
323 memset (__mempcpy (new_str, __getopt_nonoption_flags,
324 nonoption_flags_max_len),
325 '\0', top + 1 - nonoption_flags_max_len);
326 nonoption_flags_max_len = top + 1;
327 __getopt_nonoption_flags = new_str;
330 #endif
332 while (top > middle && middle > bottom)
334 if (top - middle > middle - bottom)
336 /* Bottom segment is the short one. */
337 int len = middle - bottom;
338 register int i;
340 /* Swap it with the top part of the top segment. */
341 for (i = 0; i < len; i++)
343 tem = argv[bottom + i];
344 argv[bottom + i] = argv[top - (middle - bottom) + i];
345 argv[top - (middle - bottom) + i] = tem;
346 SWAP_FLAGS (bottom + i, top - (middle - bottom) + i);
348 /* Exclude the moved bottom segment from further swapping. */
349 top -= len;
351 else
353 /* Top segment is the short one. */
354 int len = top - middle;
355 register int i;
357 /* Swap it with the bottom part of the bottom segment. */
358 for (i = 0; i < len; i++)
360 tem = argv[bottom + i];
361 argv[bottom + i] = argv[middle + i];
362 argv[middle + i] = tem;
363 SWAP_FLAGS (bottom + i, middle + i);
365 /* Exclude the moved top segment from further swapping. */
366 bottom += len;
370 /* Update records for the slots the non-options now occupy. */
372 first_nonopt += (optind - last_nonopt);
373 last_nonopt = optind;
376 /* Initialize the internal data when the first call is made. */
378 #if defined __STDC__ && __STDC__
379 static const char *_getopt_initialize (int, char *const *, const char *);
380 #endif
381 static const char *
382 _getopt_initialize (int argc, char *const *argv, const char *optstring)
384 /* Start processing options with ARGV-element 1 (since ARGV-element 0
385 is the program name); the sequence of previously skipped
386 non-option ARGV-elements is empty. */
388 first_nonopt = last_nonopt = optind;
390 nextchar = NULL;
392 posixly_correct = getenv ("POSIXLY_CORRECT");
394 /* Determine how to handle the ordering of options and nonoptions. */
396 if (optstring[0] == '-')
398 ordering = RETURN_IN_ORDER;
399 ++optstring;
401 else if (optstring[0] == '+')
403 ordering = REQUIRE_ORDER;
404 ++optstring;
406 else if (posixly_correct != NULL)
407 ordering = REQUIRE_ORDER;
408 else
409 ordering = PERMUTE;
411 #ifdef _LIBC
412 if (posixly_correct == NULL
413 && argc == original_argc && argv == original_argv)
415 if (nonoption_flags_max_len == 0)
417 if (__getopt_nonoption_flags == NULL
418 || __getopt_nonoption_flags[0] == '\0')
419 nonoption_flags_max_len = -1;
420 else
422 const char *orig_str = __getopt_nonoption_flags;
423 int len = nonoption_flags_max_len = strlen (orig_str);
424 if (nonoption_flags_max_len < argc)
425 nonoption_flags_max_len = argc;
426 __getopt_nonoption_flags =
427 (char *) malloc (nonoption_flags_max_len);
428 if (__getopt_nonoption_flags == NULL)
429 nonoption_flags_max_len = -1;
430 else
431 memset (__mempcpy (__getopt_nonoption_flags, orig_str, len),
432 '\0', nonoption_flags_max_len - len);
435 nonoption_flags_len = nonoption_flags_max_len;
437 else
438 nonoption_flags_len = 0;
439 #endif
441 return optstring;
444 /* Scan elements of ARGV (whose length is ARGC) for option characters
445 given in OPTSTRING.
447 If an element of ARGV starts with '-', and is not exactly "-" or "--",
448 then it is an option element. The characters of this element
449 (aside from the initial '-') are option characters. If `getopt'
450 is called repeatedly, it returns successively each of the option characters
451 from each of the option elements.
453 If `getopt' finds another option character, it returns that character,
454 updating `optind' and `nextchar' so that the next call to `getopt' can
455 resume the scan with the following option character or ARGV-element.
457 If there are no more option characters, `getopt' returns -1.
458 Then `optind' is the index in ARGV of the first ARGV-element
459 that is not an option. (The ARGV-elements have been permuted
460 so that those that are not options now come last.)
462 OPTSTRING is a string containing the legitimate option characters.
463 If an option character is seen that is not listed in OPTSTRING,
464 return '?' after printing an error message. If you set `opterr' to
465 zero, the error message is suppressed but we still return '?'.
467 If a char in OPTSTRING is followed by a colon, that means it wants an arg,
468 so the following text in the same ARGV-element, or the text of the following
469 ARGV-element, is returned in `optarg'. Two colons mean an option that
470 wants an optional arg; if there is text in the current ARGV-element,
471 it is returned in `optarg', otherwise `optarg' is set to zero.
473 If OPTSTRING starts with `-' or `+', it requests different methods of
474 handling the non-option ARGV-elements.
475 See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
477 Long-named options begin with `--' instead of `-'.
478 Their names may be abbreviated as long as the abbreviation is unique
479 or is an exact match for some defined option. If they have an
480 argument, it follows the option name in the same ARGV-element, separated
481 from the option name by a `=', or else the in next ARGV-element.
482 When `getopt' finds a long-named option, it returns 0 if that option's
483 `flag' field is nonzero, the value of the option's `val' field
484 if the `flag' field is zero.
486 The elements of ARGV aren't really const, because we permute them.
487 But we pretend they're const in the prototype to be compatible
488 with other systems.
490 LONGOPTS is a vector of `struct option' terminated by an
491 element containing a name which is zero.
493 LONGIND returns the index in LONGOPT of the long-named option found.
494 It is only valid when a long-named option has been found by the most
495 recent call.
497 If LONG_ONLY is nonzero, '-' as well as '--' can introduce
498 long-named options. */
501 _getopt_internal (int argc, char *const *argv, const char *optstring,
502 const struct option *longopts, int *longind, int long_only)
504 optarg = NULL;
506 if (optind == 0 || !__getopt_initialized)
508 if (optind == 0)
509 optind = 1; /* Don't scan ARGV[0], the program name. */
510 optstring = _getopt_initialize (argc, argv, optstring);
511 __getopt_initialized = 1;
514 /* Test whether ARGV[optind] points to a non-option argument.
515 Either it does not have option syntax, or there is an environment flag
516 from the shell indicating it is not an option. The later information
517 is only used when the used in the GNU libc. */
518 #ifdef _LIBC
519 # define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0' \
520 || (optind < nonoption_flags_len \
521 && __getopt_nonoption_flags[optind] == '1'))
522 #else
523 # define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0')
524 #endif
526 if (nextchar == NULL || *nextchar == '\0')
528 /* Advance to the next ARGV-element. */
530 /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been
531 moved back by the user (who may also have changed the arguments). */
532 if (last_nonopt > optind)
533 last_nonopt = optind;
534 if (first_nonopt > optind)
535 first_nonopt = optind;
537 if (ordering == PERMUTE)
539 /* If we have just processed some options following some non-options,
540 exchange them so that the options come first. */
542 if (first_nonopt != last_nonopt && last_nonopt != optind)
543 exchange ((char **) argv);
544 else if (last_nonopt != optind)
545 first_nonopt = optind;
547 /* Skip any additional non-options
548 and extend the range of non-options previously skipped. */
550 while (optind < argc && NONOPTION_P)
551 optind++;
552 last_nonopt = optind;
555 /* The special ARGV-element `--' means premature end of options.
556 Skip it like a null option,
557 then exchange with previous non-options as if it were an option,
558 then skip everything else like a non-option. */
560 if (optind != argc && !strcmp (argv[optind], "--"))
562 optind++;
564 if (first_nonopt != last_nonopt && last_nonopt != optind)
565 exchange ((char **) argv);
566 else if (first_nonopt == last_nonopt)
567 first_nonopt = optind;
568 last_nonopt = argc;
570 optind = argc;
573 /* If we have done all the ARGV-elements, stop the scan
574 and back over any non-options that we skipped and permuted. */
576 if (optind == argc)
578 /* Set the next-arg-index to point at the non-options
579 that we previously skipped, so the caller will digest them. */
580 if (first_nonopt != last_nonopt)
581 optind = first_nonopt;
582 return -1;
585 /* If we have come to a non-option and did not permute it,
586 either stop the scan or describe it to the caller and pass it by. */
588 if (NONOPTION_P)
590 if (ordering == REQUIRE_ORDER)
591 return -1;
592 optarg = argv[optind++];
593 return 1;
596 /* We have found another option-ARGV-element.
597 Skip the initial punctuation. */
599 nextchar = (argv[optind] + 1
600 + (longopts != NULL && argv[optind][1] == '-'));
603 /* Decode the current option-ARGV-element. */
605 /* Check whether the ARGV-element is a long option.
607 If long_only and the ARGV-element has the form "-f", where f is
608 a valid short option, don't consider it an abbreviated form of
609 a long option that starts with f. Otherwise there would be no
610 way to give the -f short option.
612 On the other hand, if there's a long option "fubar" and
613 the ARGV-element is "-fu", do consider that an abbreviation of
614 the long option, just like "--fu", and not "-f" with arg "u".
616 This distinction seems to be the most useful approach. */
618 if (longopts != NULL
619 && (argv[optind][1] == '-'
620 || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))
622 char *nameend;
623 const struct option *p;
624 const struct option *pfound = NULL;
625 int exact = 0;
626 int ambig = 0;
627 int indfound = -1;
628 int option_index;
630 for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
631 /* Do nothing. */ ;
633 /* Test all long options for either exact match
634 or abbreviated matches. */
635 for (p = longopts, option_index = 0; p->name; p++, option_index++)
636 if (!strncmp (p->name, nextchar, nameend - nextchar))
638 if ((unsigned int) (nameend - nextchar)
639 == (unsigned int) strlen (p->name))
641 /* Exact match found. */
642 pfound = p;
643 indfound = option_index;
644 exact = 1;
645 break;
647 else if (pfound == NULL)
649 /* First nonexact match found. */
650 pfound = p;
651 indfound = option_index;
653 else
654 /* Second or later nonexact match found. */
655 ambig = 1;
658 if (ambig && !exact)
660 if (opterr)
661 fprintf (stderr, _("%s: option `%s' is ambiguous\n"),
662 argv[0], argv[optind]);
663 nextchar += strlen (nextchar);
664 optind++;
665 optopt = 0;
666 return '?';
669 if (pfound != NULL)
671 option_index = indfound;
672 optind++;
673 if (*nameend)
675 /* Don't test has_arg with >, because some C compilers don't
676 allow it to be used on enums. */
677 if (pfound->has_arg)
678 optarg = nameend + 1;
679 else
681 if (opterr)
682 if (argv[optind - 1][1] == '-')
683 /* --option */
684 fprintf (stderr,
685 _("%s: option `--%s' doesn't allow an argument\n"),
686 argv[0], pfound->name);
687 else
688 /* +option or -option */
689 fprintf (stderr,
690 _("%s: option `%c%s' doesn't allow an argument\n"),
691 argv[0], argv[optind - 1][0], pfound->name);
693 nextchar += strlen (nextchar);
695 optopt = pfound->val;
696 return '?';
699 else if (pfound->has_arg == 1)
701 if (optind < argc)
702 optarg = argv[optind++];
703 else
705 if (opterr)
706 fprintf (stderr,
707 _("%s: option `%s' requires an argument\n"),
708 argv[0], argv[optind - 1]);
709 nextchar += strlen (nextchar);
710 optopt = pfound->val;
711 return optstring[0] == ':' ? ':' : '?';
714 nextchar += strlen (nextchar);
715 if (longind != NULL)
716 *longind = option_index;
717 if (pfound->flag)
719 *(pfound->flag) = pfound->val;
720 return 0;
722 return pfound->val;
725 /* Can't find it as a long option. If this is not getopt_long_only,
726 or the option starts with '--' or is not a valid short
727 option, then it's an error.
728 Otherwise interpret it as a short option. */
729 if (!long_only || argv[optind][1] == '-'
730 || my_index (optstring, *nextchar) == NULL)
732 if (opterr)
734 if (argv[optind][1] == '-')
735 /* --option */
736 fprintf (stderr, _("%s: unrecognized option `--%s'\n"),
737 argv[0], nextchar);
738 else
739 /* +option or -option */
740 fprintf (stderr, _("%s: unrecognized option `%c%s'\n"),
741 argv[0], argv[optind][0], nextchar);
743 nextchar = (char *) "";
744 optind++;
745 optopt = 0;
746 return '?';
750 /* Look at and handle the next short option-character. */
753 char c = *nextchar++;
754 char *temp = my_index (optstring, c);
756 /* Increment `optind' when we start to process its last character. */
757 if (*nextchar == '\0')
758 ++optind;
760 if (temp == NULL || c == ':')
762 if (opterr)
764 if (posixly_correct)
765 /* 1003.2 specifies the format of this message. */
766 fprintf (stderr, _("%s: illegal option -- %c\n"),
767 argv[0], c);
768 else
769 fprintf (stderr, _("%s: invalid option -- %c\n"),
770 argv[0], c);
772 optopt = c;
773 return '?';
775 /* Convenience. Treat POSIX -W foo same as long option --foo */
776 if (temp[0] == 'W' && temp[1] == ';')
778 char *nameend;
779 const struct option *p;
780 const struct option *pfound = NULL;
781 int exact = 0;
782 int ambig = 0;
783 int indfound = 0;
784 int option_index;
786 /* This is an option that requires an argument. */
787 if (*nextchar != '\0')
789 optarg = nextchar;
790 /* If we end this ARGV-element by taking the rest as an arg,
791 we must advance to the next element now. */
792 optind++;
794 else if (optind == argc)
796 if (opterr)
798 /* 1003.2 specifies the format of this message. */
799 fprintf (stderr, _("%s: option requires an argument -- %c\n"),
800 argv[0], c);
802 optopt = c;
803 if (optstring[0] == ':')
804 c = ':';
805 else
806 c = '?';
807 return c;
809 else
810 /* We already incremented `optind' once;
811 increment it again when taking next ARGV-elt as argument. */
812 optarg = argv[optind++];
814 /* optarg is now the argument, see if it's in the
815 table of longopts. */
817 for (nextchar = nameend = optarg; *nameend && *nameend != '='; nameend++)
818 /* Do nothing. */ ;
820 /* Test all long options for either exact match
821 or abbreviated matches. */
822 for (p = longopts, option_index = 0; p->name; p++, option_index++)
823 if (!strncmp (p->name, nextchar, nameend - nextchar))
825 if ((unsigned int) (nameend - nextchar) == strlen (p->name))
827 /* Exact match found. */
828 pfound = p;
829 indfound = option_index;
830 exact = 1;
831 break;
833 else if (pfound == NULL)
835 /* First nonexact match found. */
836 pfound = p;
837 indfound = option_index;
839 else
840 /* Second or later nonexact match found. */
841 ambig = 1;
843 if (ambig && !exact)
845 if (opterr)
846 fprintf (stderr, _("%s: option `-W %s' is ambiguous\n"),
847 argv[0], argv[optind]);
848 nextchar += strlen (nextchar);
849 optind++;
850 return '?';
852 if (pfound != NULL)
854 option_index = indfound;
855 if (*nameend)
857 /* Don't test has_arg with >, because some C compilers don't
858 allow it to be used on enums. */
859 if (pfound->has_arg)
860 optarg = nameend + 1;
861 else
863 if (opterr)
864 fprintf (stderr, _("\
865 %s: option `-W %s' doesn't allow an argument\n"),
866 argv[0], pfound->name);
868 nextchar += strlen (nextchar);
869 return '?';
872 else if (pfound->has_arg == 1)
874 if (optind < argc)
875 optarg = argv[optind++];
876 else
878 if (opterr)
879 fprintf (stderr,
880 _("%s: option `%s' requires an argument\n"),
881 argv[0], argv[optind - 1]);
882 nextchar += strlen (nextchar);
883 return optstring[0] == ':' ? ':' : '?';
886 nextchar += strlen (nextchar);
887 if (longind != NULL)
888 *longind = option_index;
889 if (pfound->flag)
891 *(pfound->flag) = pfound->val;
892 return 0;
894 return pfound->val;
896 nextchar = NULL;
897 return 'W'; /* Let the application handle it. */
899 if (temp[1] == ':')
901 if (temp[2] == ':')
903 /* This is an option that accepts an argument optionally. */
904 if (*nextchar != '\0')
906 optarg = nextchar;
907 optind++;
909 else
910 optarg = NULL;
911 nextchar = NULL;
913 else
915 /* This is an option that requires an argument. */
916 if (*nextchar != '\0')
918 optarg = nextchar;
919 /* If we end this ARGV-element by taking the rest as an arg,
920 we must advance to the next element now. */
921 optind++;
923 else if (optind == argc)
925 if (opterr)
927 /* 1003.2 specifies the format of this message. */
928 fprintf (stderr,
929 _("%s: option requires an argument -- %c\n"),
930 argv[0], c);
932 optopt = c;
933 if (optstring[0] == ':')
934 c = ':';
935 else
936 c = '?';
938 else
939 /* We already incremented `optind' once;
940 increment it again when taking next ARGV-elt as argument. */
941 optarg = argv[optind++];
942 nextchar = NULL;
945 return c;
950 getopt (int argc, char *const *argv, const char *optstring)
952 return _getopt_internal (argc, argv, optstring,
953 (const struct option *) 0,
954 (int *) 0,
958 #endif /* Not ELIDE_CODE. */
960 #ifdef TEST
962 /* Compile with -DTEST to make an executable for use in testing
963 the above definition of `getopt'. */
966 main (int argc, char **argv)
968 int c;
969 int digit_optind = 0;
971 while (1)
973 int this_option_optind = optind ? optind : 1;
975 c = getopt (argc, argv, "abc:d:0123456789");
976 if (c == -1)
977 break;
979 switch (c)
981 case '0':
982 case '1':
983 case '2':
984 case '3':
985 case '4':
986 case '5':
987 case '6':
988 case '7':
989 case '8':
990 case '9':
991 if (digit_optind != 0 && digit_optind != this_option_optind)
992 printf ("digits occur in two different argv-elements.\n");
993 digit_optind = this_option_optind;
994 printf ("option %c\n", c);
995 break;
997 case 'a':
998 printf ("option a\n");
999 break;
1001 case 'b':
1002 printf ("option b\n");
1003 break;
1005 case 'c':
1006 printf ("option c with value `%s'\n", optarg);
1007 break;
1009 case '?':
1010 break;
1012 default:
1013 printf ("?? getopt returned character code 0%o ??\n", c);
1017 if (optind < argc)
1019 printf ("non-option ARGV-elements: ");
1020 while (optind < argc)
1021 printf ("%s ", argv[optind++]);
1022 printf ("\n");
1025 exit (0);
1028 #endif /* TEST */