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 
  34 static 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 
  44 void
  45 parse_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 }