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,
4   2006 Free 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#include <config.h>
23
24/* Specification.  */
25#include "long-options.h"
26
27#include <stdarg.h>
28#include <stdio.h>
29#include <stdlib.h>
30#include <getopt.h>
31
32#include "version-etc.h"
33
34static struct option const long_options[] =
35{
36  {"help", no_argument, NULL, 'h'},
37  {"version", no_argument, NULL, 'v'},
38  {NULL, 0, NULL, 0}
39};
40
41/* Process long options --help and --version, but only if argc == 2.
42   Be careful not to gobble up `--'.  */
43
44void
45parse_long_options (int argc,
46		    char **argv,
47		    const char *command_name,
48		    const char *package,
49		    const char *version,
50		    void (*usage_func) (int),
51		    /* const char *author1, ...*/ ...)
52{
53  int c;
54  int saved_opterr;
55
56  saved_opterr = opterr;
57
58  /* Don't print an error message for unrecognized options.  */
59  opterr = 0;
60
61  if (argc == 2
62      && (c = getopt_long (argc, argv, "+", long_options, NULL)) != -1)
63    {
64      switch (c)
65	{
66	case 'h':
67	  (*usage_func) (EXIT_SUCCESS);
68
69	case 'v':
70	  {
71	    va_list authors;
72	    va_start (authors, usage_func);
73	    version_etc_va (stdout, command_name, package, version, authors);
74	    exit (0);
75	  }
76
77	default:
78	  /* Don't process any other long-named options.  */
79	  break;
80	}
81    }
82
83  /* Restore previous value.  */
84  opterr = saved_opterr;
85
86  /* Reset this to zero so that getopt internals get initialized from
87     the probably-new parameters when/if getopt is called later.  */
88  optind = 0;
89}
90