source: vendor/diffutils/2.8.1/lib/getopt.c

Last change on this file was 2556, checked in by bird, 19 years ago

diffutils 2.8.1

File size: 29.8 KB
Line 
1/* Getopt for GNU.
2 NOTE: getopt is now part of the C library, so if you don't know what
3 "Keep this file name-space clean" means, talk to drepper@gnu.org
4 before changing it!
5 Copyright (C) 1987,88,89,90,91,92,93,94,95,96,98,99,2000,2001
6 Free Software Foundation, Inc.
7 This file is part of the GNU C Library.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2, or (at your option)
12 any later version.
13
14 This program 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
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software Foundation,
21 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22
23
24/* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.
25 Ditto for AIX 3.2 and <stdlib.h>. */
26#ifndef _NO_PROTO
27# define _NO_PROTO
28#endif
29
30#ifdef HAVE_CONFIG_H
31# include <config.h>
32#endif
33
34#if !defined __STDC__ || !__STDC__
35/* This is a separate conditional since some stdc systems
36 reject `defined (const)'. */
37# ifndef const
38# define const
39# endif
40#endif
41
42#include <stdio.h>
43
44/* Comment out all this code if we are using the GNU C Library, and are not
45 actually compiling the library itself. This code is part of the GNU C
46 Library, but also included in many other GNU distributions. Compiling
47 and linking in this code is a waste when using the GNU C library
48 (especially if it is a shared library). Rather than having every GNU
49 program understand `configure --with-gnu-libc' and omit the object files,
50 it is simpler to just do this in the source for each such file. */
51
52#define GETOPT_INTERFACE_VERSION 2
53#if !defined _LIBC && defined __GLIBC__ && __GLIBC__ >= 2
54# include <gnu-versions.h>
55# if _GNU_GETOPT_INTERFACE_VERSION == GETOPT_INTERFACE_VERSION
56# define ELIDE_CODE
57# endif
58#endif
59
60#ifndef ELIDE_CODE
61
62
63/* This needs to come after some library #include
64 to get __GNU_LIBRARY__ defined. */
65#ifdef __GNU_LIBRARY__
66/* Don't include stdlib.h for non-GNU C libraries because some of them
67 contain conflicting prototypes for getopt. */
68# include <stdlib.h>
69# include <unistd.h>
70#endif /* GNU C library. */
71
72#ifdef VMS
73# include <unixlib.h>
74# if HAVE_STRING_H - 0
75# include <string.h>
76# endif
77#endif
78
79#ifndef _
80/* This is for other GNU distributions with internationalized messages. */
81# if (HAVE_LIBINTL_H && ENABLE_NLS) || defined _LIBC
82# include <libintl.h>
83# ifndef _
84# define _(msgid) gettext (msgid)
85# endif
86# else
87# define _(msgid) (msgid)
88# endif
89#endif
90
91/* This version of `getopt' appears to the caller like standard Unix `getopt'
92 but it behaves differently for the user, since it allows the user
93 to intersperse the options with the other arguments.
94
95 As `getopt' works, it permutes the elements of ARGV so that,
96 when it is done, all the options precede everything else. Thus
97 all application programs are extended to handle flexible argument order.
98
99 Setting the environment variable POSIXLY_CORRECT disables permutation.
100 Then the behavior is completely standard.
101
102 GNU application programs can use a third alternative mode in which
103 they can distinguish the relative order of options and other arguments. */
104
105#include "getopt.h"
106
107/* For communication from `getopt' to the caller.
108 When `getopt' finds an option that takes an argument,
109 the argument value is returned here.
110 Also, when `ordering' is RETURN_IN_ORDER,
111 each non-option ARGV-element is returned here. */
112
113char *optarg;
114
115/* Index in ARGV of the next element to be scanned.
116 This is used for communication to and from the caller
117 and for communication between successive calls to `getopt'.
118
119 On entry to `getopt', zero means this is the first call; initialize.
120
121 When `getopt' returns -1, this is the index of the first of the
122 non-option elements that the caller should itself scan.
123
124 Otherwise, `optind' communicates from one call to the next
125 how much of ARGV has been scanned so far. */
126
127/* 1003.2 says this must be 1 before any call. */
128int optind = 1;
129
130/* Formerly, initialization of getopt depended on optind==0, which
131 causes problems with re-calling getopt as programs generally don't
132 know that. */
133
134int __getopt_initialized;
135
136/* The next char to be scanned in the option-element
137 in which the last option character we returned was found.
138 This allows us to pick up the scan where we left off.
139
140 If this is zero, or a null string, it means resume the scan
141 by advancing to the next ARGV-element. */
142
143static char *nextchar;
144
145/* Callers store zero here to inhibit the error message
146 for unrecognized options. */
147
148int opterr = 1;
149
150/* Set to an option character which was unrecognized.
151 This must be initialized on some systems to avoid linking in the
152 system's own getopt implementation. */
153
154int optopt = '?';
155
156/* Describe how to deal with options that follow non-option ARGV-elements.
157
158 If the caller did not specify anything,
159 the default is REQUIRE_ORDER if the environment variable
160 POSIXLY_CORRECT is defined, PERMUTE otherwise.
161
162 REQUIRE_ORDER means don't recognize them as options;
163 stop option processing when the first non-option is seen.
164 This is what Unix does.
165 This mode of operation is selected by either setting the environment
166 variable POSIXLY_CORRECT, or using `+' as the first character
167 of the list of option characters.
168
169 PERMUTE is the default. We permute the contents of ARGV as we scan,
170 so that eventually all the non-options are at the end. This allows options
171 to be given in any order, even with programs that were not written to
172 expect this.
173
174 RETURN_IN_ORDER is an option available to programs that were written
175 to expect options and other ARGV-elements in any order and that care about
176 the ordering of the two. We describe each non-option ARGV-element
177 as if it were the argument of an option with character code 1.
178 Using `-' as the first character of the list of option characters
179 selects this mode of operation.
180
181 The special argument `--' forces an end of option-scanning regardless
182 of the value of `ordering'. In the case of RETURN_IN_ORDER, only
183 `--' can cause `getopt' to return -1 with `optind' != ARGC. */
184
185static enum
186{
187 REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
188} ordering;
189
190/* Value of POSIXLY_CORRECT environment variable. */
191static char *posixly_correct;
192
193
194#ifdef __GNU_LIBRARY__
195/* We want to avoid inclusion of string.h with non-GNU libraries
196 because there are many ways it can cause trouble.
197 On some systems, it contains special magic macros that don't work
198 in GCC. */
199# include <string.h>
200# define my_index strchr
201#else
202
203# if HAVE_STRING_H
204# include <string.h>
205# else
206# include <strings.h>
207# endif
208
209/* Avoid depending on library functions or files
210 whose names are inconsistent. */
211
212#ifndef getenv
213extern char *getenv ();
214#endif
215
216static char *
217my_index (str, chr)
218 const char *str;
219 int chr;
220{
221 while (*str)
222 {
223 if (*str == chr)
224 return (char *) str;
225 str++;
226 }
227 return 0;
228}
229
230/* If using GCC, we can safely declare strlen this way.
231 If not using GCC, it is ok not to declare it. */
232#ifdef __GNUC__
233/* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
234 That was relevant to code that was here before. */
235# if (!defined __STDC__ || !__STDC__) && !defined strlen
236/* gcc with -traditional declares the built-in strlen to return int,
237 and has done so at least since version 2.4.5. -- rms. */
238extern int strlen (const char *);
239# endif /* not __STDC__ */
240#endif /* __GNUC__ */
241
242#endif /* not __GNU_LIBRARY__ */
243
244
245/* Handle permutation of arguments. */
246
247/* Describe the part of ARGV that contains non-options that have
248 been skipped. `first_nonopt' is the index in ARGV of the first of them;
249 `last_nonopt' is the index after the last of them. */
250
251static int first_nonopt;
252static int last_nonopt;
253
254#ifdef _LIBC
255/* Bash 2.0 gives us an environment variable containing flags
256 indicating ARGV elements that should not be considered arguments. */
257
258#ifdef USE_NONOPTION_FLAGS
259/* Defined in getopt_init.c */
260extern char *__getopt_nonoption_flags;
261
262static int nonoption_flags_max_len;
263static int nonoption_flags_len;
264#endif
265
266static int original_argc;
267static char *const *original_argv;
268
269/* Make sure the environment variable bash 2.0 puts in the environment
270 is valid for the getopt call we must make sure that the ARGV passed
271 to getopt is that one passed to the process. */
272static void
273__attribute__ ((unused))
274store_args_and_env (int argc, char *const *argv)
275{
276 /* XXX This is no good solution. We should rather copy the args so
277 that we can compare them later. But we must not use malloc(3). */
278 original_argc = argc;
279 original_argv = argv;
280}
281# ifdef text_set_element
282text_set_element (__libc_subinit, store_args_and_env);
283# endif /* text_set_element */
284
285# ifdef USE_NONOPTION_FLAGS
286# define SWAP_FLAGS(ch1, ch2) \
287 if (nonoption_flags_len > 0) \
288 { \
289 char __tmp = __getopt_nonoption_flags[ch1]; \
290 __getopt_nonoption_flags[ch1] = __getopt_nonoption_flags[ch2]; \
291 __getopt_nonoption_flags[ch2] = __tmp; \
292 }
293# else
294# define SWAP_FLAGS(ch1, ch2)
295# endif
296#else /* !_LIBC */
297# define SWAP_FLAGS(ch1, ch2)
298#endif /* _LIBC */
299
300/* Exchange two adjacent subsequences of ARGV.
301 One subsequence is elements [first_nonopt,last_nonopt)
302 which contains all the non-options that have been skipped so far.
303 The other is elements [last_nonopt,optind), which contains all
304 the options processed since those non-options were skipped.
305
306 `first_nonopt' and `last_nonopt' are relocated so that they describe
307 the new indices of the non-options in ARGV after they are moved. */
308
309#if defined __STDC__ && __STDC__
310static void exchange (char **);
311#endif
312
313static void
314exchange (argv)
315 char **argv;
316{
317 int bottom = first_nonopt;
318 int middle = last_nonopt;
319 int top = optind;
320 char *tem;
321
322 /* Exchange the shorter segment with the far end of the longer segment.
323 That puts the shorter segment into the right place.
324 It leaves the longer segment in the right place overall,
325 but it consists of two parts that need to be swapped next. */
326
327#if defined _LIBC && defined USE_NONOPTION_FLAGS
328 /* First make sure the handling of the `__getopt_nonoption_flags'
329 string can work normally. Our top argument must be in the range
330 of the string. */
331 if (nonoption_flags_len > 0 && top >= nonoption_flags_max_len)
332 {
333 /* We must extend the array. The user plays games with us and
334 presents new arguments. */
335 char *new_str = malloc (top + 1);
336 if (new_str == NULL)
337 nonoption_flags_len = nonoption_flags_max_len = 0;
338 else
339 {
340 memset (__mempcpy (new_str, __getopt_nonoption_flags,
341 nonoption_flags_max_len),
342 '\0', top + 1 - nonoption_flags_max_len);
343 nonoption_flags_max_len = top + 1;
344 __getopt_nonoption_flags = new_str;
345 }
346 }
347#endif
348
349 while (top > middle && middle > bottom)
350 {
351 if (top - middle > middle - bottom)
352 {
353 /* Bottom segment is the short one. */
354 int len = middle - bottom;
355 register int i;
356
357 /* Swap it with the top part of the top segment. */
358 for (i = 0; i < len; i++)
359 {
360 tem = argv[bottom + i];
361 argv[bottom + i] = argv[top - (middle - bottom) + i];
362 argv[top - (middle - bottom) + i] = tem;
363 SWAP_FLAGS (bottom + i, top - (middle - bottom) + i);
364 }
365 /* Exclude the moved bottom segment from further swapping. */
366 top -= len;
367 }
368 else
369 {
370 /* Top segment is the short one. */
371 int len = top - middle;
372 register int i;
373
374 /* Swap it with the bottom part of the bottom segment. */
375 for (i = 0; i < len; i++)
376 {
377 tem = argv[bottom + i];
378 argv[bottom + i] = argv[middle + i];
379 argv[middle + i] = tem;
380 SWAP_FLAGS (bottom + i, middle + i);
381 }
382 /* Exclude the moved top segment from further swapping. */
383 bottom += len;
384 }
385 }
386
387 /* Update records for the slots the non-options now occupy. */
388
389 first_nonopt += (optind - last_nonopt);
390 last_nonopt = optind;
391}
392
393/* Initialize the internal data when the first call is made. */
394
395#if defined __STDC__ && __STDC__
396static const char *_getopt_initialize (int, char *const *, const char *);
397#endif
398static const char *
399_getopt_initialize (argc, argv, optstring)
400 int argc;
401 char *const *argv;
402 const char *optstring;
403{
404 /* Start processing options with ARGV-element 1 (since ARGV-element 0
405 is the program name); the sequence of previously skipped
406 non-option ARGV-elements is empty. */
407
408 first_nonopt = last_nonopt = optind;
409
410 nextchar = NULL;
411
412 posixly_correct = getenv ("POSIXLY_CORRECT");
413
414 /* Determine how to handle the ordering of options and nonoptions. */
415
416 if (optstring[0] == '-')
417 {
418 ordering = RETURN_IN_ORDER;
419 ++optstring;
420 }
421 else if (optstring[0] == '+')
422 {
423 ordering = REQUIRE_ORDER;
424 ++optstring;
425 }
426 else if (posixly_correct != NULL)
427 ordering = REQUIRE_ORDER;
428 else
429 ordering = PERMUTE;
430
431#if defined _LIBC && defined USE_NONOPTION_FLAGS
432 if (posixly_correct == NULL
433 && argc == original_argc && argv == original_argv)
434 {
435 if (nonoption_flags_max_len == 0)
436 {
437 if (__getopt_nonoption_flags == NULL
438 || __getopt_nonoption_flags[0] == '\0')
439 nonoption_flags_max_len = -1;
440 else
441 {
442 const char *orig_str = __getopt_nonoption_flags;
443 int len = nonoption_flags_max_len = strlen (orig_str);
444 if (nonoption_flags_max_len < argc)
445 nonoption_flags_max_len = argc;
446 __getopt_nonoption_flags =
447 (char *) malloc (nonoption_flags_max_len);
448 if (__getopt_nonoption_flags == NULL)
449 nonoption_flags_max_len = -1;
450 else
451 memset (__mempcpy (__getopt_nonoption_flags, orig_str, len),
452 '\0', nonoption_flags_max_len - len);
453 }
454 }
455 nonoption_flags_len = nonoption_flags_max_len;
456 }
457 else
458 nonoption_flags_len = 0;
459#endif
460
461 return optstring;
462}
463
464
465/* Scan elements of ARGV (whose length is ARGC) for option characters
466 given in OPTSTRING.
467
468 If an element of ARGV starts with '-', and is not exactly "-" or "--",
469 then it is an option element. The characters of this element
470 (aside from the initial '-') are option characters. If `getopt'
471 is called repeatedly, it returns successively each of the option characters
472 from each of the option elements.
473
474 If `getopt' finds another option character, it returns that character,
475 updating `optind' and `nextchar' so that the next call to `getopt' can
476 resume the scan with the following option character or ARGV-element.
477
478 If there are no more option characters, `getopt' returns -1.
479 Then `optind' is the index in ARGV of the first ARGV-element
480 that is not an option. (The ARGV-elements have been permuted
481 so that those that are not options now come last.)
482
483 OPTSTRING is a string containing the legitimate option characters.
484 If an option character is seen that is not listed in OPTSTRING,
485 return '?' after printing an error message. If you set `opterr' to
486 zero, the error message is suppressed but we still return '?'.
487
488 If a char in OPTSTRING is followed by a colon, that means it wants an arg,
489 so the following text in the same ARGV-element, or the text of the following
490 ARGV-element, is returned in `optarg'. Two colons mean an option that
491 wants an optional arg; if there is text in the current ARGV-element,
492 it is returned in `optarg', otherwise `optarg' is set to zero.
493
494 If OPTSTRING starts with `-' or `+', it requests different methods of
495 handling the non-option ARGV-elements.
496 See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
497
498 Long-named options begin with `--' instead of `-'.
499 Their names may be abbreviated as long as the abbreviation is unique
500 or is an exact match for some defined option. If they have an
501 argument, it follows the option name in the same ARGV-element, separated
502 from the option name by a `=', or else the in next ARGV-element.
503 When `getopt' finds a long-named option, it returns 0 if that option's
504 `flag' field is nonzero, the value of the option's `val' field
505 if the `flag' field is zero.
506
507 The elements of ARGV aren't really const, because we permute them.
508 But we pretend they're const in the prototype to be compatible
509 with other systems.
510
511 LONGOPTS is a vector of `struct option' terminated by an
512 element containing a name which is zero.
513
514 LONGIND returns the index in LONGOPT of the long-named option found.
515 It is only valid when a long-named option has been found by the most
516 recent call.
517
518 If LONG_ONLY is nonzero, '-' as well as '--' can introduce
519 long-named options. */
520
521int
522_getopt_internal (argc, argv, optstring, longopts, longind, long_only)
523 int argc;
524 char *const *argv;
525 const char *optstring;
526 const struct option *longopts;
527 int *longind;
528 int long_only;
529{
530 int print_errors = opterr;
531 if (optstring[0] == ':')
532 print_errors = 0;
533
534 if (argc < 1)
535 return -1;
536
537 optarg = NULL;
538
539 if (optind == 0 || !__getopt_initialized)
540 {
541 if (optind == 0)
542 optind = 1; /* Don't scan ARGV[0], the program name. */
543 optstring = _getopt_initialize (argc, argv, optstring);
544 __getopt_initialized = 1;
545 }
546
547 /* Test whether ARGV[optind] points to a non-option argument.
548 Either it does not have option syntax, or there is an environment flag
549 from the shell indicating it is not an option. The later information
550 is only used when the used in the GNU libc. */
551#if defined _LIBC && defined USE_NONOPTION_FLAGS
552# define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0' \
553 || (optind < nonoption_flags_len \
554 && __getopt_nonoption_flags[optind] == '1'))
555#else
556# define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0')
557#endif
558
559 if (nextchar == NULL || *nextchar == '\0')
560 {
561 /* Advance to the next ARGV-element. */
562
563 /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been
564 moved back by the user (who may also have changed the arguments). */
565 if (last_nonopt > optind)
566 last_nonopt = optind;
567 if (first_nonopt > optind)
568 first_nonopt = optind;
569
570 if (ordering == PERMUTE)
571 {
572 /* If we have just processed some options following some non-options,
573 exchange them so that the options come first. */
574
575 if (first_nonopt != last_nonopt && last_nonopt != optind)
576 exchange ((char **) argv);
577 else if (last_nonopt != optind)
578 first_nonopt = optind;
579
580 /* Skip any additional non-options
581 and extend the range of non-options previously skipped. */
582
583 while (optind < argc && NONOPTION_P)
584 optind++;
585 last_nonopt = optind;
586 }
587
588 /* The special ARGV-element `--' means premature end of options.
589 Skip it like a null option,
590 then exchange with previous non-options as if it were an option,
591 then skip everything else like a non-option. */
592
593 if (optind != argc && !strcmp (argv[optind], "--"))
594 {
595 optind++;
596
597 if (first_nonopt != last_nonopt && last_nonopt != optind)
598 exchange ((char **) argv);
599 else if (first_nonopt == last_nonopt)
600 first_nonopt = optind;
601 last_nonopt = argc;
602
603 optind = argc;
604 }
605
606 /* If we have done all the ARGV-elements, stop the scan
607 and back over any non-options that we skipped and permuted. */
608
609 if (optind == argc)
610 {
611 /* Set the next-arg-index to point at the non-options
612 that we previously skipped, so the caller will digest them. */
613 if (first_nonopt != last_nonopt)
614 optind = first_nonopt;
615 return -1;
616 }
617
618 /* If we have come to a non-option and did not permute it,
619 either stop the scan or describe it to the caller and pass it by. */
620
621 if (NONOPTION_P)
622 {
623 if (ordering == REQUIRE_ORDER)
624 return -1;
625 optarg = argv[optind++];
626 return 1;
627 }
628
629 /* We have found another option-ARGV-element.
630 Skip the initial punctuation. */
631
632 nextchar = (argv[optind] + 1
633 + (longopts != NULL && argv[optind][1] == '-'));
634 }
635
636 /* Decode the current option-ARGV-element. */
637
638 /* Check whether the ARGV-element is a long option.
639
640 If long_only and the ARGV-element has the form "-f", where f is
641 a valid short option, don't consider it an abbreviated form of
642 a long option that starts with f. Otherwise there would be no
643 way to give the -f short option.
644
645 On the other hand, if there's a long option "fubar" and
646 the ARGV-element is "-fu", do consider that an abbreviation of
647 the long option, just like "--fu", and not "-f" with arg "u".
648
649 This distinction seems to be the most useful approach. */
650
651 if (longopts != NULL
652 && (argv[optind][1] == '-'
653 || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))
654 {
655 char *nameend;
656 const struct option *p;
657 const struct option *pfound = NULL;
658 int exact = 0;
659 int ambig = 0;
660 int indfound = -1;
661 int option_index;
662
663 for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
664 /* Do nothing. */ ;
665
666 /* Test all long options for either exact match
667 or abbreviated matches. */
668 for (p = longopts, option_index = 0; p->name; p++, option_index++)
669 if (!strncmp (p->name, nextchar, nameend - nextchar))
670 {
671 if ((unsigned int) (nameend - nextchar)
672 == (unsigned int) strlen (p->name))
673 {
674 /* Exact match found. */
675 pfound = p;
676 indfound = option_index;
677 exact = 1;
678 break;
679 }
680 else if (pfound == NULL)
681 {
682 /* First nonexact match found. */
683 pfound = p;
684 indfound = option_index;
685 }
686 else if (long_only
687 || pfound->has_arg != p->has_arg
688 || pfound->flag != p->flag
689 || pfound->val != p->val)
690 /* Second or later nonexact match found. */
691 ambig = 1;
692 }
693
694 if (ambig && !exact)
695 {
696 if (print_errors)
697 fprintf (stderr, _("%s: option `%s' is ambiguous\n"),
698 argv[0], argv[optind]);
699 nextchar += strlen (nextchar);
700 optind++;
701 optopt = 0;
702 return '?';
703 }
704
705 if (pfound != NULL)
706 {
707 option_index = indfound;
708 optind++;
709 if (*nameend)
710 {
711 /* Don't test has_arg with >, because some C compilers don't
712 allow it to be used on enums. */
713 if (pfound->has_arg)
714 optarg = nameend + 1;
715 else
716 {
717 if (print_errors)
718 {
719 if (argv[optind - 1][1] == '-')
720 /* --option */
721 fprintf (stderr,
722 _("%s: option `--%s' doesn't allow an argument\n"),
723 argv[0], pfound->name);
724 else
725 /* +option or -option */
726 fprintf (stderr,
727 _("%s: option `%c%s' doesn't allow an argument\n"),
728 argv[0], argv[optind - 1][0], pfound->name);
729 }
730
731 nextchar += strlen (nextchar);
732
733 optopt = pfound->val;
734 return '?';
735 }
736 }
737 else if (pfound->has_arg == 1)
738 {
739 if (optind < argc)
740 optarg = argv[optind++];
741 else
742 {
743 if (print_errors)
744 fprintf (stderr,
745 _("%s: option `%s' requires an argument\n"),
746 argv[0], argv[optind - 1]);
747 nextchar += strlen (nextchar);
748 optopt = pfound->val;
749 return optstring[0] == ':' ? ':' : '?';
750 }
751 }
752 nextchar += strlen (nextchar);
753 if (longind != NULL)
754 *longind = option_index;
755 if (pfound->flag)
756 {
757 *(pfound->flag) = pfound->val;
758 return 0;
759 }
760 return pfound->val;
761 }
762
763 /* Can't find it as a long option. If this is not getopt_long_only,
764 or the option starts with '--' or is not a valid short
765 option, then it's an error.
766 Otherwise interpret it as a short option. */
767 if (!long_only || argv[optind][1] == '-'
768 || my_index (optstring, *nextchar) == NULL)
769 {
770 if (print_errors)
771 {
772 if (argv[optind][1] == '-')
773 /* --option */
774 fprintf (stderr, _("%s: unrecognized option `--%s'\n"),
775 argv[0], nextchar);
776 else
777 /* +option or -option */
778 fprintf (stderr, _("%s: unrecognized option `%c%s'\n"),
779 argv[0], argv[optind][0], nextchar);
780 }
781 nextchar = (char *) "";
782 optind++;
783 optopt = 0;
784 return '?';
785 }
786 }
787
788 /* Look at and handle the next short option-character. */
789
790 {
791 char c = *nextchar++;
792 char *temp = my_index (optstring, c);
793
794 /* Increment `optind' when we start to process its last character. */
795 if (*nextchar == '\0')
796 ++optind;
797
798 if (temp == NULL || c == ':')
799 {
800 if (print_errors)
801 {
802 if (posixly_correct)
803 /* 1003.2 specifies the format of this message. */
804 fprintf (stderr, _("%s: illegal option -- %c\n"),
805 argv[0], c);
806 else
807 fprintf (stderr, _("%s: invalid option -- %c\n"),
808 argv[0], c);
809 }
810 optopt = c;
811 return '?';
812 }
813 /* Convenience. Treat POSIX -W foo same as long option --foo */
814 if (temp[0] == 'W' && temp[1] == ';')
815 {
816 char *nameend;
817 const struct option *p;
818 const struct option *pfound = NULL;
819 int exact = 0;
820 int ambig = 0;
821 int indfound = 0;
822 int option_index;
823
824 /* This is an option that requires an argument. */
825 if (*nextchar != '\0')
826 {
827 optarg = nextchar;
828 /* If we end this ARGV-element by taking the rest as an arg,
829 we must advance to the next element now. */
830 optind++;
831 }
832 else if (optind == argc)
833 {
834 if (print_errors)
835 {
836 /* 1003.2 specifies the format of this message. */
837 fprintf (stderr, _("%s: option requires an argument -- %c\n"),
838 argv[0], c);
839 }
840 optopt = c;
841 if (optstring[0] == ':')
842 c = ':';
843 else
844 c = '?';
845 return c;
846 }
847 else
848 /* We already incremented `optind' once;
849 increment it again when taking next ARGV-elt as argument. */
850 optarg = argv[optind++];
851
852 /* optarg is now the argument, see if it's in the
853 table of longopts. */
854
855 for (nextchar = nameend = optarg; *nameend && *nameend != '='; nameend++)
856 /* Do nothing. */ ;
857
858 /* Test all long options for either exact match
859 or abbreviated matches. */
860 for (p = longopts, option_index = 0; p->name; p++, option_index++)
861 if (!strncmp (p->name, nextchar, nameend - nextchar))
862 {
863 if ((unsigned int) (nameend - nextchar) == strlen (p->name))
864 {
865 /* Exact match found. */
866 pfound = p;
867 indfound = option_index;
868 exact = 1;
869 break;
870 }
871 else if (pfound == NULL)
872 {
873 /* First nonexact match found. */
874 pfound = p;
875 indfound = option_index;
876 }
877 else
878 /* Second or later nonexact match found. */
879 ambig = 1;
880 }
881 if (ambig && !exact)
882 {
883 if (print_errors)
884 fprintf (stderr, _("%s: option `-W %s' is ambiguous\n"),
885 argv[0], argv[optind]);
886 nextchar += strlen (nextchar);
887 optind++;
888 return '?';
889 }
890 if (pfound != NULL)
891 {
892 option_index = indfound;
893 if (*nameend)
894 {
895 /* Don't test has_arg with >, because some C compilers don't
896 allow it to be used on enums. */
897 if (pfound->has_arg)
898 optarg = nameend + 1;
899 else
900 {
901 if (print_errors)
902 fprintf (stderr, _("\
903%s: option `-W %s' doesn't allow an argument\n"),
904 argv[0], pfound->name);
905
906 nextchar += strlen (nextchar);
907 return '?';
908 }
909 }
910 else if (pfound->has_arg == 1)
911 {
912 if (optind < argc)
913 optarg = argv[optind++];
914 else
915 {
916 if (print_errors)
917 fprintf (stderr,
918 _("%s: option `%s' requires an argument\n"),
919 argv[0], argv[optind - 1]);
920 nextchar += strlen (nextchar);
921 return optstring[0] == ':' ? ':' : '?';
922 }
923 }
924 nextchar += strlen (nextchar);
925 if (longind != NULL)
926 *longind = option_index;
927 if (pfound->flag)
928 {
929 *(pfound->flag) = pfound->val;
930 return 0;
931 }
932 return pfound->val;
933 }
934 nextchar = NULL;
935 return 'W'; /* Let the application handle it. */
936 }
937 if (temp[1] == ':')
938 {
939 if (temp[2] == ':')
940 {
941 /* This is an option that accepts an argument optionally. */
942 if (*nextchar != '\0')
943 {
944 optarg = nextchar;
945 optind++;
946 }
947 else
948 optarg = NULL;
949 nextchar = NULL;
950 }
951 else
952 {
953 /* This is an option that requires an argument. */
954 if (*nextchar != '\0')
955 {
956 optarg = nextchar;
957 /* If we end this ARGV-element by taking the rest as an arg,
958 we must advance to the next element now. */
959 optind++;
960 }
961 else if (optind == argc)
962 {
963 if (print_errors)
964 {
965 /* 1003.2 specifies the format of this message. */
966 fprintf (stderr,
967 _("%s: option requires an argument -- %c\n"),
968 argv[0], c);
969 }
970 optopt = c;
971 if (optstring[0] == ':')
972 c = ':';
973 else
974 c = '?';
975 }
976 else
977 /* We already incremented `optind' once;
978 increment it again when taking next ARGV-elt as argument. */
979 optarg = argv[optind++];
980 nextchar = NULL;
981 }
982 }
983 return c;
984 }
985}
986
987int
988getopt (argc, argv, optstring)
989 int argc;
990 char *const *argv;
991 const char *optstring;
992{
993 return _getopt_internal (argc, argv, optstring,
994 (const struct option *) 0,
995 (int *) 0,
996 0);
997}
998
999#endif /* Not ELIDE_CODE. */
1000
1001
1002#ifdef TEST
1003
1004/* Compile with -DTEST to make an executable for use in testing
1005 the above definition of `getopt'. */
1006
1007int
1008main (argc, argv)
1009 int argc;
1010 char **argv;
1011{
1012 int c;
1013 int digit_optind = 0;
1014
1015 while (1)
1016 {
1017 int this_option_optind = optind ? optind : 1;
1018
1019 c = getopt (argc, argv, "abc:d:0123456789");
1020 if (c == -1)
1021 break;
1022
1023 switch (c)
1024 {
1025 case '0':
1026 case '1':
1027 case '2':
1028 case '3':
1029 case '4':
1030 case '5':
1031 case '6':
1032 case '7':
1033 case '8':
1034 case '9':
1035 if (digit_optind != 0 && digit_optind != this_option_optind)
1036 printf ("digits occur in two different argv-elements.\n");
1037 digit_optind = this_option_optind;
1038 printf ("option %c\n", c);
1039 break;
1040
1041 case 'a':
1042 printf ("option a\n");
1043 break;
1044
1045 case 'b':
1046 printf ("option b\n");
1047 break;
1048
1049 case 'c':
1050 printf ("option c with value `%s'\n", optarg);
1051 break;
1052
1053 case '?':
1054 break;
1055
1056 default:
1057 printf ("?? getopt returned character code 0%o ??\n", c);
1058 }
1059 }
1060
1061 if (optind < argc)
1062 {
1063 printf ("non-option ARGV-elements: ");
1064 while (optind < argc)
1065 printf ("%s ", argv[optind++]);
1066 printf ("\n");
1067 }
1068
1069 exit (0);
1070}
1071
1072#endif /* TEST */
Note: See TracBrowser for help on using the repository browser.