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
6   Copyright (C) 1987, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98
7   	Free Software Foundation, Inc.
8
9   NOTE: The canonical source of this file is maintained with the GNU C Library.
10   Bugs can be reported to bug-glibc@gnu.org.
11
12   This program is free software; you can redistribute it and/or modify it
13   under the terms of the GNU General Public License as published by the
14   Free Software Foundation; either version 2, or (at your option) any
15   later version.
16
17   This program 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
20   GNU General Public License for more details.
21
22   You should have received a copy of the GNU General Public License
23   along with this program; if not, write to the Free Software
24   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
25   USA.  */
26
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
32
33#ifdef HAVE_CONFIG_H
34# include <config.h>
35#endif
36
37#if !defined __STDC__ || !__STDC__
38/* This is a separate conditional since some stdc systems
39   reject `defined (const)'.  */
40# ifndef const
41#  define const
42# endif
43#endif
44
45#include <stdio.h>
46
47/* Comment out all this code if we are using the GNU C Library, and are not
48   actually compiling the library itself.  This code is part of the GNU C
49   Library, but also included in many other GNU distributions.  Compiling
50   and linking in this code is a waste when using the GNU C library
51   (especially if it is a shared library).  Rather than having every GNU
52   program understand `configure --with-gnu-libc' and omit the object files,
53   it is simpler to just do this in the source for each such file.  */
54
55#define GETOPT_INTERFACE_VERSION 2
56#if !defined _LIBC && defined __GLIBC__ && __GLIBC__ >= 2
57# include <gnu-versions.h>
58# if _GNU_GETOPT_INTERFACE_VERSION == GETOPT_INTERFACE_VERSION
59#  define ELIDE_CODE
60# endif
61#endif
62
63#ifndef ELIDE_CODE
64
65
66/* This needs to come after some library #include
67   to get __GNU_LIBRARY__ defined.  */
68#ifdef	__GNU_LIBRARY__
69/* Don't include stdlib.h for non-GNU C libraries because some of them
70   contain conflicting prototypes for getopt.  */
71# include <stdlib.h>
72# include <unistd.h>
73#endif	/* GNU C library.  */
74
75#ifdef VMS
76# include <unixlib.h>
77# if HAVE_STRING_H - 0
78#  include <string.h>
79# endif
80#endif
81
82#ifndef _
83/* This is for other GNU distributions with internationalized messages.
84   When compiling libc, the _ macro is predefined.  */
85# ifdef HAVE_LIBINTL_H
86#  include <libintl.h>
87#  define _(msgid)	gettext (msgid)
88# else
89#  define _(msgid)	(msgid)
90# endif
91#endif
92
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.
96
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.
100
101   Setting the environment variable POSIXLY_CORRECT disables permutation.
102   Then the behavior is completely standard.
103
104   GNU application programs can use a third alternative mode in which
105   they can distinguish the relative order of options and other arguments.  */
106
107#include "getopt.h"
108
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.  */
114
115char *optarg = NULL;
116
117/* Index in ARGV of the next element to be scanned.
118   This is used for communication to and from the caller
119   and for communication between successive calls to `getopt'.
120
121   On entry to `getopt', zero means this is the first call; initialize.
122
123   When `getopt' returns -1, this is the index of the first of the
124   non-option elements that the caller should itself scan.
125
126   Otherwise, `optind' communicates from one call to the next
127   how much of ARGV has been scanned so far.  */
128
129/* 1003.2 says this must be 1 before any call.  */
130int optind = 1;
131
132/* Formerly, initialization of getopt depended on optind==0, which
133   causes problems with re-calling getopt as programs generally don't
134   know that. */
135
136int __getopt_initialized = 0;
137
138/* The next char to be scanned in the option-element
139   in which the last option character we returned was found.
140   This allows us to pick up the scan where we left off.
141
142   If this is zero, or a null string, it means resume the scan
143   by advancing to the next ARGV-element.  */
144
145static char *nextchar;
146
147/* Callers store zero here to inhibit the error message
148   for unrecognized options.  */
149
150int opterr = 1;
151
152/* Set to an option character which was unrecognized.
153   This must be initialized on some systems to avoid linking in the
154   system's own getopt implementation.  */
155
156int optopt = '?';
157
158/* Describe how to deal with options that follow non-option ARGV-elements.
159
160   If the caller did not specify anything,
161   the default is REQUIRE_ORDER if the environment variable
162   POSIXLY_CORRECT is defined, PERMUTE otherwise.
163
164   REQUIRE_ORDER means don't recognize them as options;
165   stop option processing when the first non-option is seen.
166   This is what Unix does.
167   This mode of operation is selected by either setting the environment
168   variable POSIXLY_CORRECT, or using `+' as the first character
169   of the list of option characters.
170
171   PERMUTE is the default.  We permute the contents of ARGV as we scan,
172   so that eventually all the non-options are at the end.  This allows options
173   to be given in any order, even with programs that were not written to
174   expect this.
175
176   RETURN_IN_ORDER is an option available to programs that were written
177   to expect options and other ARGV-elements in any order and that care about
178   the ordering of the two.  We describe each non-option ARGV-element
179   as if it were the argument of an option with character code 1.
180   Using `-' as the first character of the list of option characters
181   selects this mode of operation.
182
183   The special argument `--' forces an end of option-scanning regardless
184   of the value of `ordering'.  In the case of RETURN_IN_ORDER, only
185   `--' can cause `getopt' to return -1 with `optind' != ARGC.  */
186
187static enum
188{
189  REQUIRE_ORDER, PERMUTE, RETURN_IN_ORDER
190} ordering;
191
192/* Value of POSIXLY_CORRECT environment variable.  */
193static char *posixly_correct;
194
195#ifdef	__GNU_LIBRARY__
196/* We want to avoid inclusion of string.h with non-GNU libraries
197   because there are many ways it can cause trouble.
198   On some systems, it contains special magic macros that don't work
199   in GCC.  */
200# include <string.h>
201# define my_index	strchr
202#else
203
204# if HAVE_STRING_H
205#  include <string.h>
206# else
207#  if HAVE_STRINGS_H
208#   include <strings.h>
209#  endif
210# endif
211
212/* Avoid depending on library functions or files
213   whose names are inconsistent.  */
214
215#ifndef getenv
216extern char *getenv ();
217#endif
218
219static char *
220my_index (str, chr)
221     const char *str;
222     int chr;
223{
224  while (*str)
225    {
226      if (*str == chr)
227	return (char *) str;
228      str++;
229    }
230  return 0;
231}
232
233/* If using GCC, we can safely declare strlen this way.
234   If not using GCC, it is ok not to declare it.  */
235#ifdef __GNUC__
236/* Note that Motorola Delta 68k R3V7 comes with GCC but not stddef.h.
237   That was relevant to code that was here before.  */
238# if (!defined __STDC__ || !__STDC__) && !defined strlen
239/* gcc with -traditional declares the built-in strlen to return int,
240   and has done so at least since version 2.4.5. -- rms.  */
241extern int strlen (const char *);
242# endif /* not __STDC__ */
243#endif /* __GNUC__ */
244
245#endif /* not __GNU_LIBRARY__ */
246
247/* Handle permutation of arguments.  */
248
249/* Describe the part of ARGV that contains non-options that have
250   been skipped.  `first_nonopt' is the index in ARGV of the first of them;
251   `last_nonopt' is the index after the last of them.  */
252
253static int first_nonopt;
254static int last_nonopt;
255
256#ifdef _LIBC
257/* Bash 2.0 gives us an environment variable containing flags
258   indicating ARGV elements that should not be considered arguments.  */
259
260/* Defined in getopt_init.c  */
261extern char *__getopt_nonoption_flags;
262
263static int nonoption_flags_max_len;
264static int nonoption_flags_len;
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# define SWAP_FLAGS(ch1, ch2) \
286  if (nonoption_flags_len > 0)						      \
287    {									      \
288      char __tmp = __getopt_nonoption_flags[ch1];			      \
289      __getopt_nonoption_flags[ch1] = __getopt_nonoption_flags[ch2];	      \
290      __getopt_nonoption_flags[ch2] = __tmp;				      \
291    }
292#else	/* !_LIBC */
293# define SWAP_FLAGS(ch1, ch2)
294#endif	/* _LIBC */
295
296/* Exchange two adjacent subsequences of ARGV.
297   One subsequence is elements [first_nonopt,last_nonopt)
298   which contains all the non-options that have been skipped so far.
299   The other is elements [last_nonopt,optind), which contains all
300   the options processed since those non-options were skipped.
301
302   `first_nonopt' and `last_nonopt' are relocated so that they describe
303   the new indices of the non-options in ARGV after they are moved.  */
304
305#if defined __STDC__ && __STDC__
306static void exchange (char **);
307#endif
308
309static void
310exchange (argv)
311     char **argv;
312{
313  int bottom = first_nonopt;
314  int middle = last_nonopt;
315  int top = optind;
316  char *tem;
317
318  /* Exchange the shorter segment with the far end of the longer segment.
319     That puts the shorter segment into the right place.
320     It leaves the longer segment in the right place overall,
321     but it consists of two parts that need to be swapped next.  */
322
323#ifdef _LIBC
324  /* First make sure the handling of the `__getopt_nonoption_flags'
325     string can work normally.  Our top argument must be in the range
326     of the string.  */
327  if (nonoption_flags_len > 0 && top >= nonoption_flags_max_len)
328    {
329      /* We must extend the array.  The user plays games with us and
330	 presents new arguments.  */
331      char *new_str = malloc (top + 1);
332      if (new_str == NULL)
333	nonoption_flags_len = nonoption_flags_max_len = 0;
334      else
335	{
336	  memset (__mempcpy (new_str, __getopt_nonoption_flags,
337			     nonoption_flags_max_len),
338		  '\0', top + 1 - nonoption_flags_max_len);
339	  nonoption_flags_max_len = top + 1;
340	  __getopt_nonoption_flags = new_str;
341	}
342    }
343#endif
344
345  while (top > middle && middle > bottom)
346    {
347      if (top - middle > middle - bottom)
348	{
349	  /* Bottom segment is the short one.  */
350	  int len = middle - bottom;
351	  register int i;
352
353	  /* Swap it with the top part of the top segment.  */
354	  for (i = 0; i < len; i++)
355	    {
356	      tem = argv[bottom + i];
357	      argv[bottom + i] = argv[top - (middle - bottom) + i];
358	      argv[top - (middle - bottom) + i] = tem;
359	      SWAP_FLAGS (bottom + i, top - (middle - bottom) + i);
360	    }
361	  /* Exclude the moved bottom segment from further swapping.  */
362	  top -= len;
363	}
364      else
365	{
366	  /* Top segment is the short one.  */
367	  int len = top - middle;
368	  register int i;
369
370	  /* Swap it with the bottom part of the bottom segment.  */
371	  for (i = 0; i < len; i++)
372	    {
373	      tem = argv[bottom + i];
374	      argv[bottom + i] = argv[middle + i];
375	      argv[middle + i] = tem;
376	      SWAP_FLAGS (bottom + i, middle + i);
377	    }
378	  /* Exclude the moved top segment from further swapping.  */
379	  bottom += len;
380	}
381    }
382
383  /* Update records for the slots the non-options now occupy.  */
384
385  first_nonopt += (optind - last_nonopt);
386  last_nonopt = optind;
387}
388
389/* Initialize the internal data when the first call is made.  */
390
391#if defined __STDC__ && __STDC__
392static const char *_getopt_initialize (int, char *const *, const char *);
393#endif
394static const char *
395_getopt_initialize (argc, argv, optstring)
396     int argc;
397     char *const *argv;
398     const char *optstring;
399{
400  /* Start processing options with ARGV-element 1 (since ARGV-element 0
401     is the program name); the sequence of previously skipped
402     non-option ARGV-elements is empty.  */
403
404  first_nonopt = last_nonopt = optind;
405
406  nextchar = NULL;
407
408  posixly_correct = getenv ("POSIXLY_CORRECT");
409
410  /* Determine how to handle the ordering of options and nonoptions.  */
411
412  if (optstring[0] == '-')
413    {
414      ordering = RETURN_IN_ORDER;
415      ++optstring;
416    }
417  else if (optstring[0] == '+')
418    {
419      ordering = REQUIRE_ORDER;
420      ++optstring;
421    }
422  else if (posixly_correct != NULL)
423    ordering = REQUIRE_ORDER;
424  else
425    ordering = PERMUTE;
426
427#ifdef _LIBC
428  if (posixly_correct == NULL
429      && argc == original_argc && argv == original_argv)
430    {
431      if (nonoption_flags_max_len == 0)
432	{
433	  if (__getopt_nonoption_flags == NULL
434	      || __getopt_nonoption_flags[0] == '\0')
435	    nonoption_flags_max_len = -1;
436	  else
437	    {
438	      const char *orig_str = __getopt_nonoption_flags;
439	      int len = nonoption_flags_max_len = strlen (orig_str);
440	      if (nonoption_flags_max_len < argc)
441		nonoption_flags_max_len = argc;
442	      __getopt_nonoption_flags =
443		(char *) malloc (nonoption_flags_max_len);
444	      if (__getopt_nonoption_flags == NULL)
445		nonoption_flags_max_len = -1;
446	      else
447		memset (__mempcpy (__getopt_nonoption_flags, orig_str, len),
448			'\0', nonoption_flags_max_len - len);
449	    }
450	}
451      nonoption_flags_len = nonoption_flags_max_len;
452    }
453  else
454    nonoption_flags_len = 0;
455#endif
456
457  return optstring;
458}
459
460/* Scan elements of ARGV (whose length is ARGC) for option characters
461   given in OPTSTRING.
462
463   If an element of ARGV starts with '-', and is not exactly "-" or "--",
464   then it is an option element.  The characters of this element
465   (aside from the initial '-') are option characters.  If `getopt'
466   is called repeatedly, it returns successively each of the option characters
467   from each of the option elements.
468
469   If `getopt' finds another option character, it returns that character,
470   updating `optind' and `nextchar' so that the next call to `getopt' can
471   resume the scan with the following option character or ARGV-element.
472
473   If there are no more option characters, `getopt' returns -1.
474   Then `optind' is the index in ARGV of the first ARGV-element
475   that is not an option.  (The ARGV-elements have been permuted
476   so that those that are not options now come last.)
477
478   OPTSTRING is a string containing the legitimate option characters.
479   If an option character is seen that is not listed in OPTSTRING,
480   return '?' after printing an error message.  If you set `opterr' to
481   zero, the error message is suppressed but we still return '?'.
482
483   If a char in OPTSTRING is followed by a colon, that means it wants an arg,
484   so the following text in the same ARGV-element, or the text of the following
485   ARGV-element, is returned in `optarg'.  Two colons mean an option that
486   wants an optional arg; if there is text in the current ARGV-element,
487   it is returned in `optarg', otherwise `optarg' is set to zero.
488
489   If OPTSTRING starts with `-' or `+', it requests different methods of
490   handling the non-option ARGV-elements.
491   See the comments about RETURN_IN_ORDER and REQUIRE_ORDER, above.
492
493   Long-named options begin with `--' instead of `-'.
494   Their names may be abbreviated as long as the abbreviation is unique
495   or is an exact match for some defined option.  If they have an
496   argument, it follows the option name in the same ARGV-element, separated
497   from the option name by a `=', or else the in next ARGV-element.
498   When `getopt' finds a long-named option, it returns 0 if that option's
499   `flag' field is nonzero, the value of the option's `val' field
500   if the `flag' field is zero.
501
502   The elements of ARGV aren't really const, because we permute them.
503   But we pretend they're const in the prototype to be compatible
504   with other systems.
505
506   LONGOPTS is a vector of `struct option' terminated by an
507   element containing a name which is zero.
508
509   LONGIND returns the index in LONGOPT of the long-named option found.
510   It is only valid when a long-named option has been found by the most
511   recent call.
512
513   If LONG_ONLY is nonzero, '-' as well as '--' can introduce
514   long-named options.  */
515
516int
517_getopt_internal (argc, argv, optstring, longopts, longind, long_only)
518     int argc;
519     char *const *argv;
520     const char *optstring;
521     const struct option *longopts;
522     int *longind;
523     int long_only;
524{
525  optarg = NULL;
526
527  if (optind == 0 || !__getopt_initialized)
528    {
529      if (optind == 0)
530	optind = 1;	/* Don't scan ARGV[0], the program name.  */
531      optstring = _getopt_initialize (argc, argv, optstring);
532      __getopt_initialized = 1;
533    }
534
535  /* Test whether ARGV[optind] points to a non-option argument.
536     Either it does not have option syntax, or there is an environment flag
537     from the shell indicating it is not an option.  The later information
538     is only used when the used in the GNU libc.  */
539#ifdef _LIBC
540# define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0'	      \
541		      || (optind < nonoption_flags_len			      \
542			  && __getopt_nonoption_flags[optind] == '1'))
543#else
544# define NONOPTION_P (argv[optind][0] != '-' || argv[optind][1] == '\0')
545#endif
546
547  if (nextchar == NULL || *nextchar == '\0')
548    {
549      /* Advance to the next ARGV-element.  */
550
551      /* Give FIRST_NONOPT & LAST_NONOPT rational values if OPTIND has been
552	 moved back by the user (who may also have changed the arguments).  */
553      if (last_nonopt > optind)
554	last_nonopt = optind;
555      if (first_nonopt > optind)
556	first_nonopt = optind;
557
558      if (ordering == PERMUTE)
559	{
560	  /* If we have just processed some options following some non-options,
561	     exchange them so that the options come first.  */
562
563	  if (first_nonopt != last_nonopt && last_nonopt != optind)
564	    exchange ((char **) argv);
565	  else if (last_nonopt != optind)
566	    first_nonopt = optind;
567
568	  /* Skip any additional non-options
569	     and extend the range of non-options previously skipped.  */
570
571	  while (optind < argc && NONOPTION_P)
572	    optind++;
573	  last_nonopt = optind;
574	}
575
576      /* The special ARGV-element `--' means premature end of options.
577	 Skip it like a null option,
578	 then exchange with previous non-options as if it were an option,
579	 then skip everything else like a non-option.  */
580
581      if (optind != argc && !strcmp (argv[optind], "--"))
582	{
583	  optind++;
584
585	  if (first_nonopt != last_nonopt && last_nonopt != optind)
586	    exchange ((char **) argv);
587	  else if (first_nonopt == last_nonopt)
588	    first_nonopt = optind;
589	  last_nonopt = argc;
590
591	  optind = argc;
592	}
593
594      /* If we have done all the ARGV-elements, stop the scan
595	 and back over any non-options that we skipped and permuted.  */
596
597      if (optind == argc)
598	{
599	  /* Set the next-arg-index to point at the non-options
600	     that we previously skipped, so the caller will digest them.  */
601	  if (first_nonopt != last_nonopt)
602	    optind = first_nonopt;
603	  return -1;
604	}
605
606      /* If we have come to a non-option and did not permute it,
607	 either stop the scan or describe it to the caller and pass it by.  */
608
609      if (NONOPTION_P)
610	{
611	  if (ordering == REQUIRE_ORDER)
612	    return -1;
613	  optarg = argv[optind++];
614	  return 1;
615	}
616
617      /* We have found another option-ARGV-element.
618	 Skip the initial punctuation.  */
619
620      nextchar = (argv[optind] + 1
621		  + (longopts != NULL && argv[optind][1] == '-'));
622    }
623
624  /* Decode the current option-ARGV-element.  */
625
626  /* Check whether the ARGV-element is a long option.
627
628     If long_only and the ARGV-element has the form "-f", where f is
629     a valid short option, don't consider it an abbreviated form of
630     a long option that starts with f.  Otherwise there would be no
631     way to give the -f short option.
632
633     On the other hand, if there's a long option "fubar" and
634     the ARGV-element is "-fu", do consider that an abbreviation of
635     the long option, just like "--fu", and not "-f" with arg "u".
636
637     This distinction seems to be the most useful approach.  */
638
639  if (longopts != NULL
640      && (argv[optind][1] == '-'
641	  || (long_only && (argv[optind][2] || !my_index (optstring, argv[optind][1])))))
642    {
643      char *nameend;
644      const struct option *p;
645      const struct option *pfound = NULL;
646      int exact = 0;
647      int ambig = 0;
648      int indfound = -1;
649      int option_index;
650
651      for (nameend = nextchar; *nameend && *nameend != '='; nameend++)
652	/* Do nothing.  */ ;
653
654      /* Test all long options for either exact match
655	 or abbreviated matches.  */
656      for (p = longopts, option_index = 0; p->name; p++, option_index++)
657	if (!strncmp (p->name, nextchar, nameend - nextchar))
658	  {
659	    if ((unsigned int) (nameend - nextchar)
660		== (unsigned int) strlen (p->name))
661	      {
662		/* Exact match found.  */
663		pfound = p;
664		indfound = option_index;
665		exact = 1;
666		break;
667	      }
668	    else if (pfound == NULL)
669	      {
670		/* First nonexact match found.  */
671		pfound = p;
672		indfound = option_index;
673	      }
674	    else
675	      /* Second or later nonexact match found.  */
676	      ambig = 1;
677	  }
678
679      if (ambig && !exact)
680	{
681	  if (opterr)
682	    fprintf (stderr, _("%s: option `%s' is ambiguous\n"),
683		     argv[0], argv[optind]);
684	  nextchar += strlen (nextchar);
685	  optind++;
686	  optopt = 0;
687	  return '?';
688	}
689
690      if (pfound != NULL)
691	{
692	  option_index = indfound;
693	  optind++;
694	  if (*nameend)
695	    {
696	      /* Don't test has_arg with >, because some C compilers don't
697		 allow it to be used on enums.  */
698	      if (pfound->has_arg)
699		optarg = nameend + 1;
700	      else
701		{
702		  if (opterr)
703		    {
704		      if (argv[optind - 1][1] == '-')
705			/* --option */
706			fprintf (stderr,
707				 _("%s: option `--%s' doesn't allow an argument\n"),
708				 argv[0], pfound->name);
709		      else
710			/* +option or -option */
711			fprintf (stderr,
712				 _("%s: option `%c%s' doesn't allow an argument\n"),
713				 argv[0], argv[optind - 1][0], pfound->name);
714
715		      nextchar += strlen (nextchar);
716
717		      optopt = pfound->val;
718		      return '?';
719		    }
720		}
721	    }
722	  else if (pfound->has_arg == 1)
723	    {
724	      if (optind < argc)
725		optarg = argv[optind++];
726	      else
727		{
728		  if (opterr)
729		    fprintf (stderr,
730			   _("%s: option `%s' requires an argument\n"),
731			   argv[0], argv[optind - 1]);
732		  nextchar += strlen (nextchar);
733		  optopt = pfound->val;
734		  return optstring[0] == ':' ? ':' : '?';
735		}
736	    }
737	  nextchar += strlen (nextchar);
738	  if (longind != NULL)
739	    *longind = option_index;
740	  if (pfound->flag)
741	    {
742	      *(pfound->flag) = pfound->val;
743	      return 0;
744	    }
745	  return pfound->val;
746	}
747
748      /* Can't find it as a long option.  If this is not getopt_long_only,
749	 or the option starts with '--' or is not a valid short
750	 option, then it's an error.
751	 Otherwise interpret it as a short option.  */
752      if (!long_only || argv[optind][1] == '-'
753	  || my_index (optstring, *nextchar) == NULL)
754	{
755	  if (opterr)
756	    {
757	      if (argv[optind][1] == '-')
758		/* --option */
759		fprintf (stderr, _("%s: unrecognized option `--%s'\n"),
760			 argv[0], nextchar);
761	      else
762		/* +option or -option */
763		fprintf (stderr, _("%s: unrecognized option `%c%s'\n"),
764			 argv[0], argv[optind][0], nextchar);
765	    }
766	  nextchar = (char *) "";
767	  optind++;
768	  optopt = 0;
769	  return '?';
770	}
771    }
772
773  /* Look at and handle the next short option-character.  */
774
775  {
776    char c = *nextchar++;
777    char *temp = my_index (optstring, c);
778
779    /* Increment `optind' when we start to process its last character.  */
780    if (*nextchar == '\0')
781      ++optind;
782
783    if (temp == NULL || c == ':')
784      {
785	if (opterr)
786	  {
787	    if (posixly_correct)
788	      /* 1003.2 specifies the format of this message.  */
789	      fprintf (stderr, _("%s: illegal option -- %c\n"),
790		       argv[0], c);
791	    else
792	      fprintf (stderr, _("%s: invalid option -- %c\n"),
793		       argv[0], c);
794	  }
795	optopt = c;
796	return '?';
797      }
798    /* Convenience. Treat POSIX -W foo same as long option --foo */
799    if (temp[0] == 'W' && temp[1] == ';')
800      {
801	char *nameend;
802	const struct option *p;
803	const struct option *pfound = NULL;
804	int exact = 0;
805	int ambig = 0;
806	int indfound = 0;
807	int option_index;
808
809	/* This is an option that requires an argument.  */
810	if (*nextchar != '\0')
811	  {
812	    optarg = nextchar;
813	    /* If we end this ARGV-element by taking the rest as an arg,
814	       we must advance to the next element now.  */
815	    optind++;
816	  }
817	else if (optind == argc)
818	  {
819	    if (opterr)
820	      {
821		/* 1003.2 specifies the format of this message.  */
822		fprintf (stderr, _("%s: option requires an argument -- %c\n"),
823			 argv[0], c);
824	      }
825	    optopt = c;
826	    if (optstring[0] == ':')
827	      c = ':';
828	    else
829	      c = '?';
830	    return c;
831	  }
832	else
833	  /* We already incremented `optind' once;
834	     increment it again when taking next ARGV-elt as argument.  */
835	  optarg = argv[optind++];
836
837	/* optarg is now the argument, see if it's in the
838	   table of longopts.  */
839
840	for (nextchar = nameend = optarg; *nameend && *nameend != '='; nameend++)
841	  /* Do nothing.  */ ;
842
843	/* Test all long options for either exact match
844	   or abbreviated matches.  */
845	for (p = longopts, option_index = 0; p->name; p++, option_index++)
846	  if (!strncmp (p->name, nextchar, nameend - nextchar))
847	    {
848	      if ((unsigned int) (nameend - nextchar) == strlen (p->name))
849		{
850		  /* Exact match found.  */
851		  pfound = p;
852		  indfound = option_index;
853		  exact = 1;
854		  break;
855		}
856	      else if (pfound == NULL)
857		{
858		  /* First nonexact match found.  */
859		  pfound = p;
860		  indfound = option_index;
861		}
862	      else
863		/* Second or later nonexact match found.  */
864		ambig = 1;
865	    }
866	if (ambig && !exact)
867	  {
868	    if (opterr)
869	      fprintf (stderr, _("%s: option `-W %s' is ambiguous\n"),
870		       argv[0], argv[optind]);
871	    nextchar += strlen (nextchar);
872	    optind++;
873	    return '?';
874	  }
875	if (pfound != NULL)
876	  {
877	    option_index = indfound;
878	    if (*nameend)
879	      {
880		/* Don't test has_arg with >, because some C compilers don't
881		   allow it to be used on enums.  */
882		if (pfound->has_arg)
883		  optarg = nameend + 1;
884		else
885		  {
886		    if (opterr)
887		      fprintf (stderr, _("\
888%s: option `-W %s' doesn't allow an argument\n"),
889			       argv[0], pfound->name);
890
891		    nextchar += strlen (nextchar);
892		    return '?';
893		  }
894	      }
895	    else if (pfound->has_arg == 1)
896	      {
897		if (optind < argc)
898		  optarg = argv[optind++];
899		else
900		  {
901		    if (opterr)
902		      fprintf (stderr,
903			       _("%s: option `%s' requires an argument\n"),
904			       argv[0], argv[optind - 1]);
905		    nextchar += strlen (nextchar);
906		    return optstring[0] == ':' ? ':' : '?';
907		  }
908	      }
909	    nextchar += strlen (nextchar);
910	    if (longind != NULL)
911	      *longind = option_index;
912	    if (pfound->flag)
913	      {
914		*(pfound->flag) = pfound->val;
915		return 0;
916	      }
917	    return pfound->val;
918	  }
919	  nextchar = NULL;
920	  return 'W';	/* Let the application handle it.   */
921      }
922    if (temp[1] == ':')
923      {
924	if (temp[2] == ':')
925	  {
926	    /* This is an option that accepts an argument optionally.  */
927	    if (*nextchar != '\0')
928	      {
929		optarg = nextchar;
930		optind++;
931	      }
932	    else
933	      optarg = NULL;
934	    nextchar = NULL;
935	  }
936	else
937	  {
938	    /* This is an option that requires an argument.  */
939	    if (*nextchar != '\0')
940	      {
941		optarg = nextchar;
942		/* If we end this ARGV-element by taking the rest as an arg,
943		   we must advance to the next element now.  */
944		optind++;
945	      }
946	    else if (optind == argc)
947	      {
948		if (opterr)
949		  {
950		    /* 1003.2 specifies the format of this message.  */
951		    fprintf (stderr,
952			   _("%s: option requires an argument -- %c\n"),
953			   argv[0], c);
954		  }
955		optopt = c;
956		if (optstring[0] == ':')
957		  c = ':';
958		else
959		  c = '?';
960	      }
961	    else
962	      /* We already incremented `optind' once;
963		 increment it again when taking next ARGV-elt as argument.  */
964	      optarg = argv[optind++];
965	    nextchar = NULL;
966	  }
967      }
968    return c;
969  }
970}
971
972int
973getopt (argc, argv, optstring)
974     int argc;
975     char *const *argv;
976     const char *optstring;
977{
978  return _getopt_internal (argc, argv, optstring,
979			   (const struct option *) 0,
980			   (int *) 0,
981			   0);
982}
983
984#endif	/* Not ELIDE_CODE.  */
985
986#ifdef TEST
987
988/* Compile with -DTEST to make an executable for use in testing
989   the above definition of `getopt'.  */
990
991int
992main (argc, argv)
993     int argc;
994     char **argv;
995{
996  int c;
997  int digit_optind = 0;
998
999  while (1)
1000    {
1001      int this_option_optind = optind ? optind : 1;
1002
1003      c = getopt (argc, argv, "abc:d:0123456789");
1004      if (c == -1)
1005	break;
1006
1007      switch (c)
1008	{
1009	case '0':
1010	case '1':
1011	case '2':
1012	case '3':
1013	case '4':
1014	case '5':
1015	case '6':
1016	case '7':
1017	case '8':
1018	case '9':
1019	  if (digit_optind != 0 && digit_optind != this_option_optind)
1020	    printf ("digits occur in two different argv-elements.\n");
1021	  digit_optind = this_option_optind;
1022	  printf ("option %c\n", c);
1023	  break;
1024
1025	case 'a':
1026	  printf ("option a\n");
1027	  break;
1028
1029	case 'b':
1030	  printf ("option b\n");
1031	  break;
1032
1033	case 'c':
1034	  printf ("option c with value `%s'\n", optarg);
1035	  break;
1036
1037	case '?':
1038	  break;
1039
1040	default:
1041	  printf ("?? getopt returned character code 0%o ??\n", c);
1042	}
1043    }
1044
1045  if (optind < argc)
1046    {
1047      printf ("non-option ARGV-elements: ");
1048      while (optind < argc)
1049	printf ("%s ", argv[optind++]);
1050      printf ("\n");
1051    }
1052
1053  exit (0);
1054}
1055
1056#endif /* TEST */
1057