1/* Utility to accept --help and --version options as unobtrusively as possible.
2
3   Copyright (C) 1993, 1994, 1998, 1999, 2000, 2002, 2003, 2004, 2005 Free
4   Software Foundation, Inc.
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2, or (at your option)
9   any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software Foundation,
18   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
19
20/* Written by Jim Meyering.  */
21
22#ifdef HAVE_CONFIG_H
23# include <config.h>
24#endif
25
26/* Specification.  */
27#include "long-options.h"
28
29#include <stdarg.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <getopt.h>
33
34#include "version-etc.h"
35
36static struct option const long_options[] =
37{
38  {"help", no_argument, NULL, 'h'},
39  {"version", no_argument, NULL, 'v'},
40  {NULL, 0, NULL, 0}
41};
42
43/* Process long options --help and --version, but only if argc == 2.
44   Be careful not to gobble up `--'.  */
45
46void
47parse_long_options (int argc,
48		    char **argv,
49		    const char *command_name,
50		    const char *package,
51		    const char *version,
52		    void (*usage_func) (int),
53		    /* const char *author1, ...*/ ...)
54{
55  int c;
56  int saved_opterr;
57
58  saved_opterr = opterr;
59
60  /* Don't print an error message for unrecognized options.  */
61  opterr = 0;
62
63  if (argc == 2
64      && (c = getopt_long (argc, argv, "+", long_options, NULL)) != -1)
65    {
66      switch (c)
67	{
68	case 'h':
69	  (*usage_func) (EXIT_SUCCESS);
70
71	case 'v':
72	  {
73	    va_list authors;
74	    va_start (authors, usage_func);
75	    version_etc_va (stdout, command_name, package, version, authors);
76	    exit (0);
77	  }
78
79	default:
80	  /* Don't process any other long-named options.  */
81	  break;
82	}
83    }
84
85  /* Restore previous value.  */
86  opterr = saved_opterr;
87
88  /* Reset this to zero so that getopt internals get initialized from
89     the probably-new parameters when/if getopt is called later.  */
90  optind = 0;
91}
92