1 /* Getopt for GNU.
2 NOTE: getopt is now part of the C library, so if you don't know what
3 "Keep this file name-space clean" means, talk to roland@gnu.ai.mit.edu
4 before changing it!
6 Copyright (C) 1987, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97
7 Free Software Foundation, Inc.
9 This file is part of the GNU C Library. Its master source is NOT part of
10 the C library, however. The master source lives in /gd/gnu/lib.
12 The GNU C Library is free software; you can redistribute it and/or
13 modify it under the terms of the GNU Library General Public License as
14 published by the Free Software Foundation; either version 2 of the
15 License, or (at your option) any later version.
17 The GNU C Library is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 Library General Public License for more details.
22 You should have received a copy of the GNU Library General Public
23 License along with the GNU C Library; see the file COPYING.LIB. If not,
24 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
25 Boston, MA 02111-1307, USA. */
26 \f
27 /* This tells Alpha OSF/1 not to define a getopt prototype in <stdio.h>.
28 Ditto for AIX 3.2 and <stdlib.h>. */
29 #ifndef _NO_PROTO
30 #define _NO_PROTO
31 #endif
34 #if !defined WIN32 && (!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
43 #ifdef HAVE_CONFIG_H
44 #include "../rrd_config.h"
45 #endif
47 #include "rrd_i18n.h"
50 #include <stdio.h>
52 /* Comment out all this code if we are using the GNU C Library, and are not
53 actually compiling the library itself. This code is part of the GNU C
54 Library, but also included in many other GNU distributions. Compiling
55 and linking in this code is a waste when using the GNU C library
56 (especially if it is a shared library). Rather than having every GNU
57 program understand `configure --with-gnu-libc' and omit the object files,
58 it is simpler to just do this in the source for each such file. */
60 #define GETOPT_INTERFACE_VERSION 2
61 #if !defined (_LIBC) && defined (__GLIBC__) && __GLIBC__ >= 2
62 #include <gnu-versions.h>
63 #if _GNU_GETOPT_INTERFACE_VERSION == GETOPT_INTERFACE_VERSION
64 #define ELIDE_CODE
65 #endif
66 #endif
68 #ifndef ELIDE_CODE
71 /* This needs to come after some library #include
72 to get __GNU_LIBRARY__ defined. */
73 #ifdef __GNU_LIBRARY__
74 /* Don't include stdlib.h for non-GNU C libraries because some of them
75 contain conflicting prototypes for getopt. */
76 #include <stdlib.h>
77 #include <unistd.h>
78 #endif /* GNU C library. */
80 #ifdef VMS
81 #include <unixlib.h>
82 #if HAVE_STRING_H - 0
83 #include <string.h>
84 #endif
85 #endif
87 #if defined (_WIN32) && !defined (__CYGWIN32__)
88 /* It's not Unix, really. See? Capital letters. */
89 #include <windows.h>
90 #define getpid() GetCurrentProcessId()
91 #endif
93 /* This version of `getopt' appears to the caller like standard Unix `getopt'
94 but it behaves differently for the user, since it allows the user
95 to intersperse the options with the other arguments.
97 As `getopt' works, it permutes the elements of ARGV so that,
98 when it is done, all the options precede everything else. Thus
99 all application programs are extended to handle flexible argument order.
101 Setting the environment variable POSIXLY_CORRECT disables permutation.
102 Then the behavior is completely standard.
104 GNU application programs can use a third alternative mode in which
105 they can distinguish the relative order of options and other arguments. */
107 #include "rrd_getopt.h"
109 /* For communication from `getopt' to the caller.
110 When `getopt' finds an option that takes an argument,
111 the argument value is returned here.
112 Also, when `ordering' is RETURN_IN_ORDER,
113 each non-option ARGV-element is returned here. */
115 /*
116 * On some versions of Solaris, opterr and friends are defined in core libc
117 * rather than in a separate getopt module. Define these variables only
118 * if configure found they aren't there by default. (We assume that testing
119 * opterr is sufficient for all of these except optreset.)
120 */
121 #ifndef HAVE_INT_OPTERR
123 char *optarg = NULL;
125 /* Index in ARGV of the next element to be scanned.
126 This is used for communication to and from the caller
127 and for communication between successive calls to `getopt'.
129 On entry to `getopt', zero means this is the first call; initialize.
131 When `getopt' returns -1, this is the index of the first of the
132 non-option elements that the caller should itself scan.
134 Otherwise, `optind' communicates from one call to the next
135 how much of ARGV has been scanned so far. */
137 /* Callers store zero here to inhibit the error message
138 for unrecognized options. */
140 int opterr = 1;
142 /* Set to an option character which was unrecognized.
143 This must be initialized on some systems to avoid linking in the
144 system's own getopt implementation. */
146 int optopt = '?';
148 /* 1003.2 says this must be 1 before any call. */
149 int optind = 1;
151 #else
152 extern int opterr;
153 extern int optind;
154 extern int optopt;
155 extern char *optarg;
156 #endif
159 /* Formerly, initialization of getopt depended on optind==0, which
160 causes problems with re-calling getopt as programs generally don't
161 know that. */
163 int __getopt_initialized = 0;
165 /* The next char to be scanned in the option-element
166 in which the last option character we returned was found.
167 This allows us to pick up the scan where we left off.
169 If this is zero, or a null string, it means resume the scan
170 by advancing to the next ARGV-element. */
172 static char *nextchar;
175 /* Describe how to deal with options that follow non-option ARGV-elements.
177 If the caller did not specify anything,
178 the default is REQUIRE_ORDER if the environment variable
179 POSIXLY_CORRECT is defined, PERMUTE otherwise.
181 REQUIRE_ORDER means don't recognize them as options;
182 stop option processing when the first non-option is seen.
183 This is what Unix does.
184 This mode of operation is selected by either setting the environment
185 variable POSIXLY_CORRECT, or using `+' as the first character
186 of the list of option characters.
188 PERMUTE is the default. We permute the contents of ARGV as we scan,
189 so that eventually all the non-options are at the end. This allows options
190 to be given in any order, even with programs that were not written to
191 expect this.
193 RETURN_IN_ORDER is an option available to programs that were written
194 to expect options and other ARGV-elements in any order and that care about
195 the ordering of the two. We describe each non-option ARGV-element
196 as if it were the argument of an option with character code 1.
197 Using `-' as the first character of the list of option characters
198 selects this mode of operation.
200 The special argument `--' forces an end of option-scanning regardless
201 of the value of `ordering'. In the case of RETURN_IN_ORDER, only
202 `--' can cause `getopt' to return -1 with `optind' != ARGC. */
204 static enum {
205 REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
206 } ordering;
208 /* Value of POSIXLY_CORRECT environment variable. */
209 static char *posixly_correct;
210 \f
211 /* we must include string as there are warnings without it ... */
212 #include <string.h>
214 #ifdef __GNU_LIBRARY__
215 /* We want to avoid inclusion of string.h with non-GNU libraries
216 because there are many ways it can cause trouble.
217 On some systems, it contains special magic macros that don't work
218 in GCC. */
219 #define my_index strchr
220 #else
222 /* Avoid depending on library functions or files
223 whose names are inconsistent. */
225 char *getenv(
226 );
228 static char* my_index(const char* str, int chr)
229 {
230 while (*str) {
231 if (*str == chr)
232 return (char *) str;
233 str++;
234 }
235 return 0;
236 }
238 /* If using GCC, we can safely declare strlen this way.
239 If not using GCC, it is ok not to declare it. */
240 #ifdef __GNUC__
241 /* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
242 That was relevant to code that was here before. */
243 #if !defined (__STDC__) || !__STDC__
244 /* gcc with -traditional declares the built-in strlen to return int,
245 and has done so at least since version 2.4.5. -- rms. */
246 extern int strlen(
247 const char *);
248 #endif /* not __STDC__ */
249 #endif /* __GNUC__ */
251 #endif /* not __GNU_LIBRARY__ */
252 \f
253 /* Handle permutation of arguments. */
255 /* Describe the part of ARGV that contains non-options that have
256 been skipped. `first_nonopt' is the index in ARGV of the first of them;
257 `last_nonopt' is the index after the last of them. */
259 static int first_nonopt;
260 static int last_nonopt;
262 #ifdef _LIBC
263 /* Bash 2.0 gives us an environment variable containing flags
264 indicating ARGV elements that should not be considered arguments. */
266 static const char *nonoption_flags;
267 static int nonoption_flags_len;
269 static int original_argc;
270 static char *const *original_argv;
272 /* Make sure the environment variable bash 2.0 puts in the environment
273 is valid for the getopt call we must make sure that the ARGV passed
274 to getopt is that one passed to the process. */
275 static void store_args(
276 int argc,
277 char *const *argv) __attribute__ ((unused));
278 static void store_args(
279 int argc,
280 char *const *argv)
281 {
282 /* XXX This is no good solution. We should rather copy the args so
283 that we can compare them later. But we must not use malloc(3). */
284 original_argc = argc;
285 original_argv = argv;
286 }
288 text_set_element(__libc_subinit, store_args);
289 #endif
291 /* Exchange two adjacent subsequences of ARGV.
292 One subsequence is elements [first_nonopt,last_nonopt)
293 which contains all the non-options that have been skipped so far.
294 The other is elements [last_nonopt,optind), which contains all
295 the options processed since those non-options were skipped.
297 `first_nonopt' and `last_nonopt' are relocated so that they describe
298 the new indices of the non-options in ARGV after they are moved. */
300 #if defined (__STDC__) && __STDC__
301 static void exchange(
302 char **);
303 #endif
305 static void exchange(char** argv)
306 {
307 int bottom = first_nonopt;
308 int middle = last_nonopt;
309 int top = optind;
310 char *tem;
312 /* Exchange the shorter segment with the far end of the longer segment.
313 That puts the shorter segment into the right place.
314 It leaves the longer segment in the right place overall,
315 but it consists of two parts that need to be swapped next. */
317 while (top > middle && middle > bottom) {
318 if (top - middle > middle - bottom) {
319 /* Bottom segment is the short one. */
320 int len = middle - bottom;
321 register int i;
323 /* Swap it with the top part of the top segment. */
324 for (i = 0; i < len; i++) {
325 tem = argv[bottom + i];
326 argv[bottom + i] = argv[top - (middle - bottom) + i];
327 argv[top - (middle - bottom) + i] = tem;
328 }
329 /* Exclude the moved bottom segment from further swapping. */
330 top -= len;
331 } else {
332 /* Top segment is the short one. */
333 int len = top - middle;
334 register int i;
336 /* Swap it with the bottom part of the bottom segment. */
337 for (i = 0; i < len; i++) {
338 tem = argv[bottom + i];
339 argv[bottom + i] = argv[middle + i];
340 argv[middle + i] = tem;
341 }
342 /* Exclude the moved top segment from further swapping. */
343 bottom += len;
344 }
345 }
347 /* Update records for the slots the non-options now occupy. */
349 first_nonopt += (optind - last_nonopt);
350 last_nonopt = optind;
351 }
353 /* Initialize the internal data when the first call is made. */
355 #if defined (__STDC__) && __STDC__
356 static const char *_getopt_initialize(
357 int,
358 char *const *,
359 const char *);
360 #endif
361 static const char* _getopt_initialize(int argc,
362 char** argv,
363 const char* optstring)
364 {
365 /* Start processing options with ARGV-element 1 (since ARGV-element 0
366 is the program name); the sequence of previously skipped
367 non-option ARGV-elements is empty. */
369 first_nonopt = last_nonopt = optind = 1;
371 nextchar = NULL;
373 posixly_correct = getenv("POSIXLY_CORRECT");
375 /* Determine how to handle the ordering of options and nonoptions. */
377 if (optstring[0] == '-') {
378 ordering = RETURN_IN_ORDER;
379 ++optstring;
380 } else if (optstring[0] == '+') {
381 ordering = REQUIRE_ORDER;
382 ++optstring;
383 } else if (posixly_correct != NULL)
384 ordering = REQUIRE_ORDER;
385 else
386 ordering = PERMUTE;
388 #ifdef _LIBC
389 if (posixly_correct == NULL
390 && argc == original_argc && argv == original_argv) {
391 /* Bash 2.0 puts a special variable in the environment for each
392 command it runs, specifying which ARGV elements are the results of
393 file name wildcard expansion and therefore should not be
394 considered as options. */
395 char var[100];
397 sprintf(var, "_%d_GNU_nonoption_argv_flags_", getpid());
398 nonoption_flags = getenv(var);
399 if (nonoption_flags == NULL)
400 nonoption_flags_len = 0;
401 else
402 nonoption_flags_len = strlen(nonoption_flags);
403 } else
404 nonoption_flags_len = 0;
405 #endif
407 return optstring;
408 }
409 \f
410 /* Scan elements of ARGV (whose length is ARGC) for option characters
411 given in OPTSTRING.
413 If an element of ARGV starts with '-', and is not exactly "-" or "--",
414 then it is an option element. The characters of this element
415 (aside from the initial '-') are option characters. If `getopt'
416 is called repeatedly, it returns successively each of the option characters
417 from each of the option elements.
419 If `getopt' finds another option character, it returns that character,
420 updating `optind' and `nextchar' so that the next call to `getopt' can
421 resume the scan with the following option character or ARGV-element.
423 If there are no more option characters, `getopt' returns -1.
424 Then `optind' is the index in ARGV of the first ARGV-element
425 that is not an option. (The ARGV-elements have been permuted
426 so that those that are not options now come last.)
428 OPTSTRING is a string containing the legitimate option characters.
429 If an option character is seen that is not listed in OPTSTRING,
430 return '?' after printing an error message. If you set `opterr' to
431 zero, the error message is suppressed but we still return '?'.
433 If a char in OPTSTRING is followed by a colon, that means it wants an arg,
434 so the following text in the same ARGV-element, or the text of the following
435 ARGV-element, is returned in `optarg'. Two colons mean an option that
436 wants an optional arg; if there is text in the current ARGV-element,
437 it is returned in `optarg', otherwise `optarg' is set to zero.
439 If OPTSTRING starts with `-' or `+', it requests different methods of
440 handling the non-option ARGV-elements.
441 See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
443 Long-named options begin with `--' instead of `-'.
444 Their names may be abbreviated as long as the abbreviation is unique
445 or is an exact match for some defined option. If they have an
446 argument, it follows the option name in the same ARGV-element, separated
447 from the option name by a `=', or else the in next ARGV-element.
448 When `getopt' finds a long-named option, it returns 0 if that option's
449 `flag' field is nonzero, the value of the option's `val' field
450 if the `flag' field is zero.
452 The elements of ARGV aren't really const, because we permute them.
453 But we pretend they're const in the prototype to be compatible
454 with other systems.
456 LONGOPTS is a vector of `struct option' terminated by an
457 element containing a name which is zero.
459 LONGIND returns the index in LONGOPT of the long-named option found.
460 It is only valid when a long-named option has been found by the most
461 recent call.
463 If LONG_ONLY is nonzero, '-' as well as '--' can introduce
464 long-named options. */
466 int _getopt_internal(int argc,
467 char** argv,
468 const char *optstring,
469 const struct option *longopts,
470 int* longind,
471 int long_only)
472 {
473 optarg = NULL;
475 if (!__getopt_initialized || optind == 0) {
476 optstring = _getopt_initialize(argc, argv, optstring);
477 optind = 1; /* Don't scan ARGV[0], the program name. */
478 __getopt_initialized = 1;
479 }
481 /* Test whether ARGV[optind] points to a non-option argument.
482 Either it does not have option syntax, or there is an environment flag
483 from the shell indicating it is not an option. The later information
484 is only used when the used in the GNU libc. */
485 #ifdef _LIBC
486 #define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0' \
487 || (optind < nonoption_flags_len \
488 && nonoption_flags[optind] == '1'))
489 #else
490 #define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0')
491 #endif
493 if (nextchar == NULL || *nextchar == '\0') {
494 /* Advance to the next ARGV-element. */
496 /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been
497 moved back by the user (who may also have changed the arguments). */
498 if (last_nonopt > optind)
499 last_nonopt = optind;
500 if (first_nonopt > optind)
501 first_nonopt = optind;
503 if (ordering == PERMUTE) {
504 /* If we have just processed some options following some non-options,
505 exchange them so that the options come first. */
507 if (first_nonopt != last_nonopt && last_nonopt != optind)
508 exchange((char **) argv);
509 else if (last_nonopt != optind)
510 first_nonopt = optind;
512 /* Skip any additional non-options
513 and extend the range of non-options previously skipped. */
515 while (optind < argc && NONOPTION_P)
516 optind++;
517 last_nonopt = optind;
518 }
520 /* The special ARGV-element `--' means premature end of options.
521 Skip it like a null option,
522 then exchange with previous non-options as if it were an option,
523 then skip everything else like a non-option. */
525 if (optind != argc && !strcmp(argv[optind], "--")) {
526 optind++;
528 if (first_nonopt != last_nonopt && last_nonopt != optind)
529 exchange((char **) argv);
530 else if (first_nonopt == last_nonopt)
531 first_nonopt = optind;
532 last_nonopt = argc;
534 optind = argc;
535 }
537 /* If we have done all the ARGV-elements, stop the scan
538 and back over any non-options that we skipped and permuted. */
540 if (optind == argc) {
541 /* Set the next-arg-index to point at the non-options
542 that we previously skipped, so the caller will digest them. */
543 if (first_nonopt != last_nonopt)
544 optind = first_nonopt;
545 return -1;
546 }
548 /* If we have come to a non-option and did not permute it,
549 either stop the scan or describe it to the caller and pass it by. */
551 if (NONOPTION_P) {
552 if (ordering == REQUIRE_ORDER)
553 return -1;
554 optarg = argv[optind++];
555 return 1;
556 }
558 /* We have found another option-ARGV-element.
559 Skip the initial punctuation. */
561 nextchar = (argv[optind] + 1
562 + (longopts != NULL && argv[optind][1] == '-'));
563 }
565 /* Decode the current option-ARGV-element. */
567 /* Check whether the ARGV-element is a long option.
569 If long_only and the ARGV-element has the form "-f", where f is
570 a valid short option, don't consider it an abbreviated form of
571 a long option that starts with f. Otherwise there would be no
572 way to give the -f short option.
574 On the other hand, if there's a long option "fubar" and
575 the ARGV-element is "-fu", do consider that an abbreviation of
576 the long option, just like "--fu", and not "-f" with arg "u".
578 This distinction seems to be the most useful approach. */
580 if (longopts != NULL
581 && (argv[optind][1] == '-' || (long_only && (argv[optind][2]
582 || !my_index(optstring,
583 argv[optind]
584 [1]))))) {
585 char *nameend;
586 const struct option *p;
587 const struct option *pfound = NULL;
588 int exact = 0;
589 int ambig = 0;
590 int indfound = -1;
591 int option_index;
593 for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
594 /* Do nothing. */ ;
596 /* Test all long options for either exact match
597 or abbreviated matches. */
598 for (p = longopts, option_index = 0; p->name; p++, option_index++)
599 if (!strncmp(p->name, nextchar, nameend - nextchar)) {
600 if ((unsigned int) (nameend - nextchar)
601 == (unsigned int) strlen(p->name)) {
602 /* Exact match found. */
603 pfound = p;
604 indfound = option_index;
605 exact = 1;
606 break;
607 } else if (pfound == NULL) {
608 /* First nonexact match found. */
609 pfound = p;
610 indfound = option_index;
611 } else
612 /* Second or later nonexact match found. */
613 ambig = 1;
614 }
616 if (ambig && !exact) {
617 if (opterr)
618 fprintf(stderr, _("%s: option `%s' is ambiguous\n"),
619 argv[0], argv[optind]);
620 nextchar += strlen(nextchar);
621 optind++;
622 optopt = 0;
623 return '?';
624 }
626 if (pfound != NULL) {
627 option_index = indfound;
628 optind++;
629 if (*nameend) {
630 /* Don't test has_arg with >, because some C compilers don't
631 allow it to be used on enums. */
632 if (pfound->has_arg)
633 optarg = nameend + 1;
634 else {
635 if (opterr) {
636 if (argv[optind - 1][1] == '-')
637 /* --option */
638 fprintf(stderr,
639 _
640 ("%s: option `--%s' doesn't allow an argument\n"),
641 argv[0], pfound->name);
642 else
643 /* +option or -option */
644 fprintf(stderr,
645 _
646 ("%s: option `%c%s' doesn't allow an argument\n"),
647 argv[0], argv[optind - 1][0],
648 pfound->name);
649 }
650 nextchar += strlen(nextchar);
652 optopt = pfound->val;
653 return '?';
654 }
655 } else if (pfound->has_arg == 1) {
656 if (optind < argc)
657 optarg = argv[optind++];
658 else {
659 if (opterr)
660 fprintf(stderr,
661 _("%s: option `%s' requires an argument\n"),
662 argv[0], argv[optind - 1]);
663 nextchar += strlen(nextchar);
664 optopt = pfound->val;
665 return optstring[0] == ':' ? ':' : '?';
666 }
667 }
668 nextchar += strlen(nextchar);
669 if (longind != NULL)
670 *longind = option_index;
671 if (pfound->flag) {
672 *(pfound->flag) = pfound->val;
673 return 0;
674 }
675 return pfound->val;
676 }
678 /* Can't find it as a long option. If this is not getopt_long_only,
679 or the option starts with '--' or is not a valid short
680 option, then it's an error.
681 Otherwise interpret it as a short option. */
682 if (!long_only || argv[optind][1] == '-'
683 || my_index(optstring, *nextchar) == NULL) {
684 if (opterr) {
685 if (argv[optind][1] == '-')
686 /* --option */
687 fprintf(stderr, _("%s: unrecognized option `--%s'\n"),
688 argv[0], nextchar);
689 else
690 /* +option or -option */
691 fprintf(stderr, _("%s: unrecognized option `%c%s'\n"),
692 argv[0], argv[optind][0], nextchar);
693 }
694 nextchar = (char *) "";
695 optind++;
696 optopt = 0;
697 return '?';
698 }
699 }
701 /* Look at and handle the next short option-character. */
703 {
704 char c = *nextchar++;
705 char *temp = my_index(optstring, c);
707 /* Increment `optind' when we start to process its last character. */
708 if (*nextchar == '\0')
709 ++optind;
711 if (temp == NULL || c == ':') {
712 if (opterr) {
713 if (posixly_correct)
714 /* 1003.2 specifies the format of this message. */
715 fprintf(stderr, _("%s: illegal option -- %c\n"),
716 argv[0], c);
717 else
718 fprintf(stderr, _("%s: invalid option -- %c\n"),
719 argv[0], c);
720 }
721 optopt = c;
722 return '?';
723 }
724 /* Convenience. Treat POSIX -W foo same as long option --foo */
725 if (temp[0] == 'W' && temp[1] == ';') {
726 char *nameend;
727 const struct option *p;
728 const struct option *pfound = NULL;
729 int exact = 0;
730 int ambig = 0;
731 int indfound = 0;
732 int option_index;
734 /* This is an option that requires an argument. */
735 if (*nextchar != '\0') {
736 optarg = nextchar;
737 /* If we end this ARGV-element by taking the rest as an arg,
738 we must advance to the next element now. */
739 optind++;
740 } else if (optind == argc) {
741 if (opterr) {
742 /* 1003.2 specifies the format of this message. */
743 fprintf(stderr,
744 _("%s: option requires an argument -- %c\n"),
745 argv[0], c);
746 }
747 optopt = c;
748 if (optstring[0] == ':')
749 c = ':';
750 else
751 c = '?';
752 return c;
753 } else
754 /* We already incremented `optind' once;
755 increment it again when taking next ARGV-elt as argument. */
756 optarg = argv[optind++];
758 /* optarg is now the argument, see if it's in the
759 table of longopts. */
761 for (nextchar = nameend = optarg; *nameend && *nameend != '=';
762 nameend++)
763 /* Do nothing. */ ;
765 /* Test all long options for either exact match
766 or abbreviated matches. */
767 for (p = longopts, option_index = 0; p->name; p++, option_index++)
768 if (!strncmp(p->name, nextchar, nameend - nextchar)) {
769 if ((unsigned int) (nameend - nextchar) ==
770 strlen(p->name)) {
771 /* Exact match found. */
772 pfound = p;
773 indfound = option_index;
774 exact = 1;
775 break;
776 } else if (pfound == NULL) {
777 /* First nonexact match found. */
778 pfound = p;
779 indfound = option_index;
780 } else
781 /* Second or later nonexact match found. */
782 ambig = 1;
783 }
784 if (ambig && !exact) {
785 if (opterr)
786 fprintf(stderr, _("%s: option `-W %s' is ambiguous\n"),
787 argv[0], argv[optind]);
788 nextchar += strlen(nextchar);
789 optind++;
790 return '?';
791 }
792 if (pfound != NULL) {
793 option_index = indfound;
794 if (*nameend) {
795 /* Don't test has_arg with >, because some C compilers don't
796 allow it to be used on enums. */
797 if (pfound->has_arg)
798 optarg = nameend + 1;
799 else {
800 if (opterr)
801 fprintf(stderr, _("\
802 %s: option `-W %s' doesn't allow an argument\n"), argv[0], pfound->name);
804 nextchar += strlen(nextchar);
805 return '?';
806 }
807 } else if (pfound->has_arg == 1) {
808 if (optind < argc)
809 optarg = argv[optind++];
810 else {
811 if (opterr)
812 fprintf(stderr,
813 _
814 ("%s: option `%s' requires an argument\n"),
815 argv[0], argv[optind - 1]);
816 nextchar += strlen(nextchar);
817 return optstring[0] == ':' ? ':' : '?';
818 }
819 }
820 nextchar += strlen(nextchar);
821 if (longind != NULL)
822 *longind = option_index;
823 if (pfound->flag) {
824 *(pfound->flag) = pfound->val;
825 return 0;
826 }
827 return pfound->val;
828 }
829 nextchar = NULL;
830 return 'W'; /* Let the application handle it. */
831 }
832 if (temp[1] == ':') {
833 if (temp[2] == ':') {
834 /* This is an option that accepts an argument optionally. */
835 if (*nextchar != '\0') {
836 optarg = nextchar;
837 optind++;
838 } else
839 optarg = NULL;
840 nextchar = NULL;
841 } else {
842 /* This is an option that requires an argument. */
843 if (*nextchar != '\0') {
844 optarg = nextchar;
845 /* If we end this ARGV-element by taking the rest as an arg,
846 we must advance to the next element now. */
847 optind++;
848 } else if (optind == argc) {
849 if (opterr) {
850 /* 1003.2 specifies the format of this message. */
851 fprintf(stderr,
852 _("%s: option requires an argument -- %c\n"),
853 argv[0], c);
854 }
855 optopt = c;
856 if (optstring[0] == ':')
857 c = ':';
858 else
859 c = '?';
860 } else
861 /* We already incremented `optind' once;
862 increment it again when taking next ARGV-elt as argument. */
863 optarg = argv[optind++];
864 nextchar = NULL;
865 }
866 }
867 return c;
868 }
869 }
871 int getopt(
872 int argc,
873 char** argv,
874 const char* optstring)
875 {
876 return _getopt_internal(argc, argv, optstring,
877 (const struct option *) 0, (int *) 0, 0);
878 }
880 #endif /* Not ELIDE_CODE. */
881 \f
882 #ifdef TEST
884 /* Compile with -DTEST to make an executable for use in testing
885 the above definition of `getopt'. */
887 int main(
888 argc,
889 argv)
890 int argc;
891 char **argv;
892 {
893 int c;
894 int digit_optind = 0;
896 while (1) {
897 int this_option_optind = optind ? optind : 1;
899 c = getopt(argc, argv, "abc:d:0123456789");
900 if (c == -1)
901 break;
903 switch (c) {
904 case '0':
905 case '1':
906 case '2':
907 case '3':
908 case '4':
909 case '5':
910 case '6':
911 case '7':
912 case '8':
913 case '9':
914 if (digit_optind != 0 && digit_optind != this_option_optind)
915 printf("digits occur in two different argv-elements.\n");
916 digit_optind = this_option_optind;
917 printf("option %c\n", c);
918 break;
920 case 'a':
921 printf("option a\n");
922 break;
924 case 'b':
925 printf("option b\n");
926 break;
928 case 'c':
929 printf("option c with value `%s'\n", optarg);
930 break;
932 case '?':
933 break;
935 default:
936 printf("?? getopt returned character code 0%o ??\n", c);
937 }
938 }
940 if (optind < argc) {
941 printf("non-option ARGV-elements: ");
942 while (optind < argc)
943 printf("%s ", argv[optind++]);
944 printf("\n");
945 }
947 exit(0);
948 }
950 #endif /* TEST */