lib/long-options.c

   1 /* Utility to accept --help and --version options as unobtrusively as possible.
   2    Copyright (C) 1993-1994, 1998-1999, 2000, 2002 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by Jim Meyering.  */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <stdio.h>
  25 #include <getopt.h>
  26 #if HAVE_STDLIB_H
  27 # include <stdlib.h>
  28 #endif
  29
  30 #include "long-options.h"
  31 #include "version-etc.h"
  32
  33 static struct option const long_options[] =
  34 {
  35   {"help", no_argument, 0, 'h'},
  36   {"version", no_argument, 0, 'v'},
  37   {0, 0, 0, 0}
  38 };
  39
  40 /* Process long options --help and --version, but only if argc == 2.
  41    Be careful not to gobble up `--'.  */
  42
  43 void
  44 parse_long_options (int argc,
  45                     char **argv,
  46                     const char *command_name,
  47                     const char *package,
  48                     const char *version,
  49                     const char *authors,
  50                     void (*usage_func)())
  51 {
  52   int c;
  53   int saved_opterr;
  54
  55   saved_opterr = opterr;
  56
  57   /* Don't print an error message for unrecognized options.  */
  58   opterr = 0;
  59
  60   if (argc == 2
  61       && (c = getopt_long (argc, argv, "+", long_options, NULL)) != -1)
  62     {
  63       switch (c)
  64         {
  65         case 'h':
  66           (*usage_func) (0);
  67
  68         case 'v':
  69           version_etc (stdout, command_name, package, version, authors);
  70           exit (0);
  71
  72         default:
  73           /* Don't process any other long-named options.  */
  74           break;
  75         }
  76     }
  77
  78   /* Restore previous value.  */
  79   opterr = saved_opterr;
  80
  81   /* Reset this to zero so that getopt internals get initialized from
  82      the probably-new parameters when/if getopt is called later.  */
  83   optind = 0;
  84 }