VirtualBox

source: kBuild/trunk/src/kmk/getopt.c@ 3491

最後變更 在這個檔案從3491是 3491,由 bird 提交於 4 年 前

kmk: Darwin build and warning fixes.

  • 屬性 svn:eol-style 設為 native
檔案大小: 29.1 KB
 
1/* Getopt for GNU.
2NOTE: 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 [email protected]
4before changing it!
5
6Copyright (C) 1987-2016 Free Software Foundation, Inc.
7
8NOTE: The canonical source of this file is maintained with the GNU C Library.
9Bugs can be reported to [email protected].
10
11GNU Make is free software; you can redistribute it and/or modify it under the
12terms of the GNU General Public License as published by the Free Software
13Foundation; either version 3 of the License, or (at your option) any later
14version.
15
16GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
17WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
18A PARTICULAR PURPOSE. See the GNU General Public License for more details.
19
20You should have received a copy of the GNU General Public License along with
21this program. If not, see <http://www.gnu.org/licenses/>. */
22
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
28
29#ifdef HAVE_CONFIG_H
30# include <config.h>
31#endif
32
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
40
41#include <stdio.h>
42
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. */
50
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
58
59#ifndef ELIDE_CODE
60
61
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. */
70
71#ifdef VMS
72# include <unixlib.h>
73# if HAVE_STRING_H - 0
74# include <string.h>
75# endif
76#endif
77
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)
82
83
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.
87
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.
91
92 Setting the environment variable POSIXLY_CORRECT disables permutation.
93 Then the behavior is completely standard.
94
95 GNU application programs can use a third alternative mode in which
96 they can distinguish the relative order of options and other arguments. */
97
98#include "getopt.h"
99
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. */
105
106char *optarg = NULL;
107
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'.
111
112 On entry to `getopt', zero means this is the first call; initialize.
113
114 When `getopt' returns -1, this is the index of the first of the
115 non-option elements that the caller should itself scan.
116
117 Otherwise, `optind' communicates from one call to the next
118 how much of ARGV has been scanned so far. */
119
120/* 1003.2 says this must be 1 before any call. */
121int optind = 1;
122
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. */
126
127int __getopt_initialized = 0;
128
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.
132
133 If this is zero, or a null string, it means resume the scan
134 by advancing to the next ARGV-element. */
135
136static char *nextchar;
137
138/* Callers store zero here to inhibit the error message
139 for unrecognized options. */
140
141int opterr = 1;
142
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. */
146
147int optopt = '?';
148
149/* Describe how to deal with options that follow non-option ARGV-elements.
150
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.
154
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.
161
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.
166
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.
173
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. */
177
178static enum
179{
180 REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
181} ordering;
182
183/* Value of POSIXLY_CORRECT environment variable. */
184static char *posixly_correct;
185
186
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
195
196# if HAVE_STRING_H
197# include <string.h>
198# else
199# include <strings.h>
200# endif
201
202#ifndef KMK
203/* Avoid depending on library functions or files
204 whose names are inconsistent. */
205#ifndef getenv
206extern char *getenv ();
207#endif
208#else /* KMK */
209# include <stdlib.h>
210#endif /* KMK */
211
212static char *
213my_index (const char *str, int chr)
214{
215 while (*str)
216 {
217 if (*str == chr)
218 return (char *) str;
219 str++;
220 }
221 return 0;
222}
223
224/* If using GCC, we can safely declare strlen this way.
225 If not using GCC, it is ok not to declare it. */
226#ifdef __GNUC__
227/* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
228 That was relevant to code that was here before. */
229# if (!defined __STDC__ || !__STDC__) && !defined strlen
230/* gcc with -traditional declares the built-in strlen to return int,
231 and has done so at least since version 2.4.5. -- rms. */
232extern int strlen (const char *);
233# endif /* not __STDC__ */
234#endif /* __GNUC__ */
235
236#endif /* not __GNU_LIBRARY__ */
237
238
239/* Handle permutation of arguments. */
240
241/* Describe the part of ARGV that contains non-options that have
242 been skipped. `first_nonopt' is the index in ARGV of the first of them;
243 `last_nonopt' is the index after the last of them. */
244
245static int first_nonopt;
246static int last_nonopt;
247
248#ifdef _LIBC
249/* Bash 2.0 gives us an environment variable containing flags
250 indicating ARGV elements that should not be considered arguments. */
251
252/* Defined in getopt_init.c */
253extern char *__getopt_nonoption_flags;
254
255static int nonoption_flags_max_len;
256static int nonoption_flags_len;
257
258static int original_argc;
259static char *const *original_argv;
260
261/* Make sure the environment variable bash 2.0 puts in the environment
262 is valid for the getopt call we must make sure that the ARGV passed
263 to getopt is that one passed to the process. */
264static void __attribute__ ((unused))
265store_args_and_env (int argc, char *const *argv)
266{
267 /* XXX This is no good solution. We should rather copy the args so
268 that we can compare them later. But we must not use malloc(3). */
269 original_argc = argc;
270 original_argv = argv;
271}
272# ifdef text_set_element
273text_set_element (__libc_subinit, store_args_and_env);
274# endif /* text_set_element */
275
276# define SWAP_FLAGS(ch1, ch2) \
277 if (nonoption_flags_len > 0) \
278 { \
279 char __tmp = __getopt_nonoption_flags[ch1]; \
280 __getopt_nonoption_flags[ch1] = __getopt_nonoption_flags[ch2]; \
281 __getopt_nonoption_flags[ch2] = __tmp; \
282 }
283#else /* !_LIBC */
284# define SWAP_FLAGS(ch1, ch2)
285#endif /* _LIBC */
286
287/* Exchange two adjacent subsequences of ARGV.
288 One subsequence is elements [first_nonopt,last_nonopt)
289 which contains all the non-options that have been skipped so far.
290 The other is elements [last_nonopt,optind), which contains all
291 the options processed since those non-options were skipped.
292
293 `first_nonopt' and `last_nonopt' are relocated so that they describe
294 the new indices of the non-options in ARGV after they are moved. */
295
296#if defined __STDC__ && __STDC__
297static void exchange (char **);
298#endif
299
300static void
301exchange (char **argv)
302{
303 int bottom = first_nonopt;
304 int middle = last_nonopt;
305 int top = optind;
306 char *tem;
307
308 /* Exchange the shorter segment with the far end of the longer segment.
309 That puts the shorter segment into the right place.
310 It leaves the longer segment in the right place overall,
311 but it consists of two parts that need to be swapped next. */
312
313#ifdef _LIBC
314 /* First make sure the handling of the `__getopt_nonoption_flags'
315 string can work normally. Our top argument must be in the range
316 of the string. */
317 if (nonoption_flags_len > 0 && top >= nonoption_flags_max_len)
318 {
319 /* We must extend the array. The user plays games with us and
320 presents new arguments. */
321 char *new_str = malloc (top + 1);
322 if (new_str == NULL)
323 nonoption_flags_len = nonoption_flags_max_len = 0;
324 else
325 {
326 memset (__mempcpy (new_str, __getopt_nonoption_flags,
327 nonoption_flags_max_len),
328 '\0', top + 1 - nonoption_flags_max_len);
329 nonoption_flags_max_len = top + 1;
330 __getopt_nonoption_flags = new_str;
331 }
332 }
333#endif
334
335 while (top > middle && middle > bottom)
336 {
337 if (top - middle > middle - bottom)
338 {
339 /* Bottom segment is the short one. */
340 int len = middle - bottom;
341 register int i;
342
343 /* Swap it with the top part of the top segment. */
344 for (i = 0; i < len; i++)
345 {
346 tem = argv[bottom + i];
347 argv[bottom + i] = argv[top - (middle - bottom) + i];
348 argv[top - (middle - bottom) + i] = tem;
349 SWAP_FLAGS (bottom + i, top - (middle - bottom) + i);
350 }
351 /* Exclude the moved bottom segment from further swapping. */
352 top -= len;
353 }
354 else
355 {
356 /* Top segment is the short one. */
357 int len = top - middle;
358 register int i;
359
360 /* Swap it with the bottom part of the bottom segment. */
361 for (i = 0; i < len; i++)
362 {
363 tem = argv[bottom + i];
364 argv[bottom + i] = argv[middle + i];
365 argv[middle + i] = tem;
366 SWAP_FLAGS (bottom + i, middle + i);
367 }
368 /* Exclude the moved top segment from further swapping. */
369 bottom += len;
370 }
371 }
372
373 /* Update records for the slots the non-options now occupy. */
374
375 first_nonopt += (optind - last_nonopt);
376 last_nonopt = optind;
377}
378
379/* Initialize the internal data when the first call is made. */
380
381#if defined __STDC__ && __STDC__
382static const char *_getopt_initialize (int, char *const *, const char *);
383#endif
384static const char *
385_getopt_initialize (int argc, char *const *argv, const char *optstring)
386{
387 /* Start processing options with ARGV-element 1 (since ARGV-element 0
388 is the program name); the sequence of previously skipped
389 non-option ARGV-elements is empty. */
390
391 first_nonopt = last_nonopt = optind;
392
393 nextchar = NULL;
394
395 posixly_correct = getenv ("POSIXLY_CORRECT");
396
397 /* Determine how to handle the ordering of options and nonoptions. */
398
399 if (optstring[0] == '-')
400 {
401 ordering = RETURN_IN_ORDER;
402 ++optstring;
403 }
404 else if (optstring[0] == '+')
405 {
406 ordering = REQUIRE_ORDER;
407 ++optstring;
408 }
409 else if (posixly_correct != NULL)
410 ordering = REQUIRE_ORDER;
411 else
412 ordering = PERMUTE;
413
414#ifdef _LIBC
415 if (posixly_correct == NULL
416 && argc == original_argc && argv == original_argv)
417 {
418 if (nonoption_flags_max_len == 0)
419 {
420 if (__getopt_nonoption_flags == NULL
421 || __getopt_nonoption_flags[0] == '\0')
422 nonoption_flags_max_len = -1;
423 else
424 {
425 const char *orig_str = __getopt_nonoption_flags;
426 int len = nonoption_flags_max_len = strlen (orig_str);
427 if (nonoption_flags_max_len < argc)
428 nonoption_flags_max_len = argc;
429 __getopt_nonoption_flags =
430 (char *) malloc (nonoption_flags_max_len);
431 if (__getopt_nonoption_flags == NULL)
432 nonoption_flags_max_len = -1;
433 else
434 memset (__mempcpy (__getopt_nonoption_flags, orig_str, len),
435 '\0', nonoption_flags_max_len - len);
436 }
437 }
438 nonoption_flags_len = nonoption_flags_max_len;
439 }
440 else
441 nonoption_flags_len = 0;
442#endif
443
444 return optstring;
445}
446
447
448/* Scan elements of ARGV (whose length is ARGC) for option characters
449 given in OPTSTRING.
450
451 If an element of ARGV starts with '-', and is not exactly "-" or "--",
452 then it is an option element. The characters of this element
453 (aside from the initial '-') are option characters. If `getopt'
454 is called repeatedly, it returns successively each of the option characters
455 from each of the option elements.
456
457 If `getopt' finds another option character, it returns that character,
458 updating `optind' and `nextchar' so that the next call to `getopt' can
459 resume the scan with the following option character or ARGV-element.
460
461 If there are no more option characters, `getopt' returns -1.
462 Then `optind' is the index in ARGV of the first ARGV-element
463 that is not an option. (The ARGV-elements have been permuted
464 so that those that are not options now come last.)
465
466 OPTSTRING is a string containing the legitimate option characters.
467 If an option character is seen that is not listed in OPTSTRING,
468 return '?' after printing an error message. If you set `opterr' to
469 zero, the error message is suppressed but we still return '?'.
470
471 If a char in OPTSTRING is followed by a colon, that means it wants an arg,
472 so the following text in the same ARGV-element, or the text of the following
473 ARGV-element, is returned in `optarg'. Two colons mean an option that
474 wants an optional arg; if there is text in the current ARGV-element,
475 it is returned in `optarg', otherwise `optarg' is set to zero.
476
477 If OPTSTRING starts with `-' or `+', it requests different methods of
478 handling the non-option ARGV-elements.
479 See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
480
481 Long-named options begin with `--' instead of `-'.
482 Their names may be abbreviated as long as the abbreviation is unique
483 or is an exact match for some defined option. If they have an
484 argument, it follows the option name in the same ARGV-element, separated
485 from the option name by a `=', or else the in next ARGV-element.
486 When `getopt' finds a long-named option, it returns 0 if that option's
487 `flag' field is nonzero, the value of the option's `val' field
488 if the `flag' field is zero.
489
490 The elements of ARGV aren't really const, because we permute them.
491 But we pretend they're const in the prototype to be compatible
492 with other systems.
493
494 LONGOPTS is a vector of `struct option' terminated by an
495 element containing a name which is zero.
496
497 LONGIND returns the index in LONGOPT of the long-named option found.
498 It is only valid when a long-named option has been found by the most
499 recent call.
500
501 If LONG_ONLY is nonzero, '-' as well as '--' can introduce
502 long-named options. */
503
504int
505_getopt_internal (int argc, char *const *argv, const char *optstring,
506 const struct option *longopts, int *longind, int long_only)
507{
508 optarg = NULL;
509
510 if (optind == 0 || !__getopt_initialized)
511 {
512 if (optind == 0)
513 optind = 1; /* Don't scan ARGV[0], the program name. */
514 optstring = _getopt_initialize (argc, argv, optstring);
515 __getopt_initialized = 1;
516 }
517
518 /* Test whether ARGV[optind] points to a non-option argument.
519 Either it does not have option syntax, or there is an environment flag
520 from the shell indicating it is not an option. The later information
521 is only used when the used in the GNU libc. */
522#ifdef _LIBC
523# define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0' \
524 || (optind < nonoption_flags_len \
525 && __getopt_nonoption_flags[optind] == '1'))
526#else
527# define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0')
528#endif
529
530 if (nextchar == NULL || *nextchar == '\0')
531 {
532 /* Advance to the next ARGV-element. */
533
534 /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been
535 moved back by the user (who may also have changed the arguments). */
536 if (last_nonopt > optind)
537 last_nonopt = optind;
538 if (first_nonopt > optind)
539 first_nonopt = optind;
540
541 if (ordering == PERMUTE)
542 {
543 /* If we have just processed some options following some non-options,
544 exchange them so that the options come first. */
545
546 if (first_nonopt != last_nonopt && last_nonopt != optind)
547 exchange ((char **) argv);
548 else if (last_nonopt != optind)
549 first_nonopt = optind;
550
551 /* Skip any additional non-options
552 and extend the range of non-options previously skipped. */
553
554 while (optind < argc && NONOPTION_P)
555 optind++;
556 last_nonopt = optind;
557 }
558
559 /* The special ARGV-element `--' means premature end of options.
560 Skip it like a null option,
561 then exchange with previous non-options as if it were an option,
562 then skip everything else like a non-option. */
563
564 if (optind != argc && !strcmp (argv[optind], "--"))
565 {
566 optind++;
567
568 if (first_nonopt != last_nonopt && last_nonopt != optind)
569 exchange ((char **) argv);
570 else if (first_nonopt == last_nonopt)
571 first_nonopt = optind;
572 last_nonopt = argc;
573
574 optind = argc;
575 }
576
577 /* If we have done all the ARGV-elements, stop the scan
578 and back over any non-options that we skipped and permuted. */
579
580 if (optind == argc)
581 {
582 /* Set the next-arg-index to point at the non-options
583 that we previously skipped, so the caller will digest them. */
584 if (first_nonopt != last_nonopt)
585 optind = first_nonopt;
586 return -1;
587 }
588
589 /* If we have come to a non-option and did not permute it,
590 either stop the scan or describe it to the caller and pass it by. */
591
592 if (NONOPTION_P)
593 {
594 if (ordering == REQUIRE_ORDER)
595 return -1;
596 optarg = argv[optind++];
597 return 1;
598 }
599
600 /* We have found another option-ARGV-element.
601 Skip the initial punctuation. */
602
603 nextchar = (argv[optind] + 1
604 + (longopts != NULL && argv[optind][1] == '-'));
605 }
606
607 /* Decode the current option-ARGV-element. */
608
609 /* Check whether the ARGV-element is a long option.
610
611 If long_only and the ARGV-element has the form "-f", where f is
612 a valid short option, don't consider it an abbreviated form of
613 a long option that starts with f. Otherwise there would be no
614 way to give the -f short option.
615
616 On the other hand, if there's a long option "fubar" and
617 the ARGV-element is "-fu", do consider that an abbreviation of
618 the long option, just like "--fu", and not "-f" with arg "u".
619
620 This distinction seems to be the most useful approach. */
621
622 if (longopts != NULL
623 && (argv[optind][1] == '-'
624 || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))
625 {
626 char *nameend;
627 const struct option *p;
628 const struct option *pfound = NULL;
629 int exact = 0;
630 int ambig = 0;
631 int indfound = -1;
632 int option_index;
633
634 for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
635 /* Do nothing. */ ;
636
637 /* Test all long options for either exact match
638 or abbreviated matches. */
639 for (p = longopts, option_index = 0; p->name; p++, option_index++)
640 if (!strncmp (p->name, nextchar, nameend - nextchar))
641 {
642 if ((unsigned int) (nameend - nextchar)
643 == (unsigned int) strlen (p->name))
644 {
645 /* Exact match found. */
646 pfound = p;
647 indfound = option_index;
648 exact = 1;
649 break;
650 }
651 else if (pfound == NULL)
652 {
653 /* First nonexact match found. */
654 pfound = p;
655 indfound = option_index;
656 }
657 else
658 /* Second or later nonexact match found. */
659 ambig = 1;
660 }
661
662 if (ambig && !exact)
663 {
664 if (opterr)
665 fprintf (stderr, _("%s: option '%s' is ambiguous\n"),
666 argv[0], argv[optind]);
667 nextchar += strlen (nextchar);
668 optind++;
669 optopt = 0;
670 return '?';
671 }
672
673 if (pfound != NULL)
674 {
675 option_index = indfound;
676 optind++;
677 if (*nameend)
678 {
679 /* Don't test has_arg with >, because some C compilers don't
680 allow it to be used on enums. */
681 if (pfound->has_arg)
682 optarg = nameend + 1;
683 else
684 {
685 if (opterr)
686 { /* bird: disambiguate */
687 if (argv[optind - 1][1] == '-')
688 /* --option */
689 fprintf (stderr,
690 _("%s: option '--%s' doesn't allow an argument\n"),
691 argv[0], pfound->name);
692 else
693 /* +option or -option */
694 fprintf (stderr,
695 _("%s: option '%c%s' doesn't allow an argument\n"),
696 argv[0], argv[optind - 1][0], pfound->name);
697 }
698
699 nextchar += strlen (nextchar);
700
701 optopt = pfound->val;
702 return '?';
703 }
704 }
705 else if (pfound->has_arg == 1)
706 {
707 if (optind < argc)
708 optarg = argv[optind++];
709 else
710 {
711 if (opterr)
712 fprintf (stderr,
713 _("%s: option '%s' requires an argument\n"),
714 argv[0], argv[optind - 1]);
715 nextchar += strlen (nextchar);
716 optopt = pfound->val;
717 return optstring[0] == ':' ? ':' : '?';
718 }
719 }
720 nextchar += strlen (nextchar);
721 if (longind != NULL)
722 *longind = option_index;
723 if (pfound->flag)
724 {
725 *(pfound->flag) = pfound->val;
726 return 0;
727 }
728 return pfound->val;
729 }
730
731 /* Can't find it as a long option. If this is not getopt_long_only,
732 or the option starts with '--' or is not a valid short
733 option, then it's an error.
734 Otherwise interpret it as a short option. */
735 if (!long_only || argv[optind][1] == '-'
736 || my_index (optstring, *nextchar) == NULL)
737 {
738 if (opterr)
739 {
740 if (argv[optind][1] == '-')
741 /* --option */
742 fprintf (stderr, _("%s: unrecognized option '--%s'\n"),
743 argv[0], nextchar);
744 else
745 /* +option or -option */
746 fprintf (stderr, _("%s: unrecognized option '%c%s'\n"),
747 argv[0], argv[optind][0], nextchar);
748 }
749 nextchar = (char *) "";
750 optind++;
751 optopt = 0;
752 return '?';
753 }
754 }
755
756 /* Look at and handle the next short option-character. */
757
758 {
759 char c = *nextchar++;
760 char *temp = my_index (optstring, c);
761
762 /* Increment `optind' when we start to process its last character. */
763 if (*nextchar == '\0')
764 ++optind;
765
766 if (temp == NULL || c == ':')
767 {
768 if (opterr)
769 {
770 if (posixly_correct)
771 /* 1003.2 specifies the format of this message. */
772 fprintf (stderr, _("%s: illegal option -- %c\n"),
773 argv[0], c);
774 else
775 fprintf (stderr, _("%s: invalid option -- %c\n"),
776 argv[0], c);
777 }
778 optopt = c;
779 return '?';
780 }
781 /* Convenience. Treat POSIX -W foo same as long option --foo */
782 if (temp[0] == 'W' && temp[1] == ';')
783 {
784 char *nameend;
785 const struct option *p;
786 const struct option *pfound = NULL;
787 int exact = 0;
788 int ambig = 0;
789 int indfound = 0;
790 int option_index;
791
792 /* This is an option that requires an argument. */
793 if (*nextchar != '\0')
794 {
795 optarg = nextchar;
796 /* If we end this ARGV-element by taking the rest as an arg,
797 we must advance to the next element now. */
798 optind++;
799 }
800 else if (optind == argc)
801 {
802 if (opterr)
803 {
804 /* 1003.2 specifies the format of this message. */
805 fprintf (stderr, _("%s: option requires an argument -- %c\n"),
806 argv[0], c);
807 }
808 optopt = c;
809 if (optstring[0] == ':')
810 c = ':';
811 else
812 c = '?';
813 return c;
814 }
815 else
816 /* We already incremented `optind' once;
817 increment it again when taking next ARGV-elt as argument. */
818 optarg = argv[optind++];
819
820 /* optarg is now the argument, see if it's in the
821 table of longopts. */
822
823 for (nextchar = nameend = optarg; *nameend && *nameend != '='; nameend++)
824 /* Do nothing. */ ;
825
826 /* Test all long options for either exact match
827 or abbreviated matches. */
828 for (p = longopts, option_index = 0; p->name; p++, option_index++)
829 if (!strncmp (p->name, nextchar, nameend - nextchar))
830 {
831 if ((unsigned int) (nameend - nextchar) == strlen (p->name))
832 {
833 /* Exact match found. */
834 pfound = p;
835 indfound = option_index;
836 exact = 1;
837 break;
838 }
839 else if (pfound == NULL)
840 {
841 /* First nonexact match found. */
842 pfound = p;
843 indfound = option_index;
844 }
845 else
846 /* Second or later nonexact match found. */
847 ambig = 1;
848 }
849 if (ambig && !exact)
850 {
851 if (opterr)
852 fprintf (stderr, _("%s: option '-W %s' is ambiguous\n"),
853 argv[0], argv[optind]);
854 nextchar += strlen (nextchar);
855 optind++;
856 return '?';
857 }
858 if (pfound != NULL)
859 {
860 option_index = indfound;
861 if (*nameend)
862 {
863 /* Don't test has_arg with >, because some C compilers don't
864 allow it to be used on enums. */
865 if (pfound->has_arg)
866 optarg = nameend + 1;
867 else
868 {
869 if (opterr)
870 fprintf (stderr, _("\
871%s: option '-W %s' doesn't allow an argument\n"),
872 argv[0], pfound->name);
873
874 nextchar += strlen (nextchar);
875 return '?';
876 }
877 }
878 else if (pfound->has_arg == 1)
879 {
880 if (optind < argc)
881 optarg = argv[optind++];
882 else
883 {
884 if (opterr)
885 fprintf (stderr,
886 _("%s: option '%s' requires an argument\n"),
887 argv[0], argv[optind - 1]);
888 nextchar += strlen (nextchar);
889 return optstring[0] == ':' ? ':' : '?';
890 }
891 }
892 nextchar += strlen (nextchar);
893 if (longind != NULL)
894 *longind = option_index;
895 if (pfound->flag)
896 {
897 *(pfound->flag) = pfound->val;
898 return 0;
899 }
900 return pfound->val;
901 }
902 nextchar = NULL;
903 return 'W'; /* Let the application handle it. */
904 }
905 if (temp[1] == ':')
906 {
907 if (temp[2] == ':')
908 {
909 /* This is an option that accepts an argument optionally. */
910 if (*nextchar != '\0')
911 {
912 optarg = nextchar;
913 optind++;
914 }
915 else
916 optarg = NULL;
917 nextchar = NULL;
918 }
919 else
920 {
921 /* This is an option that requires an argument. */
922 if (*nextchar != '\0')
923 {
924 optarg = nextchar;
925 /* If we end this ARGV-element by taking the rest as an arg,
926 we must advance to the next element now. */
927 optind++;
928 }
929 else if (optind == argc)
930 {
931 if (opterr)
932 {
933 /* 1003.2 specifies the format of this message. */
934 fprintf (stderr,
935 _("%s: option requires an argument -- %c\n"),
936 argv[0], c);
937 }
938 optopt = c;
939 if (optstring[0] == ':')
940 c = ':';
941 else
942 c = '?';
943 }
944 else
945 /* We already incremented `optind' once;
946 increment it again when taking next ARGV-elt as argument. */
947 optarg = argv[optind++];
948 nextchar = NULL;
949 }
950 }
951 return c;
952 }
953}
954
955int
956getopt (int argc, char *const *argv, const char *optstring)
957{
958 return _getopt_internal (argc, argv, optstring,
959 (const struct option *) 0,
960 (int *) 0,
961 0);
962}
963
964#endif /* Not ELIDE_CODE. */
965
966
967#ifdef TEST
968
969/* Compile with -DTEST to make an executable for use in testing
970 the above definition of `getopt'. */
971
972int
973main (int argc, char **argv)
974{
975 int c;
976 int digit_optind = 0;
977
978 while (1)
979 {
980 int this_option_optind = optind ? optind : 1;
981
982 c = getopt (argc, argv, "abc:d:0123456789");
983 if (c == -1)
984 break;
985
986 switch (c)
987 {
988 case '0':
989 case '1':
990 case '2':
991 case '3':
992 case '4':
993 case '5':
994 case '6':
995 case '7':
996 case '8':
997 case '9':
998 if (digit_optind != 0 && digit_optind != this_option_optind)
999 printf ("digits occur in two different argv-elements.\n");
1000 digit_optind = this_option_optind;
1001 printf ("option %c\n", c);
1002 break;
1003
1004 case 'a':
1005 printf ("option a\n");
1006 break;
1007
1008 case 'b':
1009 printf ("option b\n");
1010 break;
1011
1012 case 'c':
1013 printf ("option c with value '%s'\n", optarg);
1014 break;
1015
1016 case '?':
1017 break;
1018
1019 default:
1020 printf ("?? getopt returned character code 0%o ??\n", c);
1021 }
1022 }
1023
1024 if (optind < argc)
1025 {
1026 printf ("non-option ARGV-elements: ");
1027 while (optind < argc)
1028 printf ("%s ", argv[optind++]);
1029 printf ("\n");
1030 }
1031
1032 exit (0);
1033}
1034
1035#endif /* TEST */
注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

© 2025 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette