lib/long-options.c

   1 /* Utility to accept --help and --version options as unobtrusively as possible.
   2    Copyright (C) 1993, 1994, 1998, 1999 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 #include "closeout.h"
  27 #include "long-options.h"
  28 #include "version-etc.h"
  29
  30 #if ENABLE_NLS
  31 # include <libintl.h>
  32 # define _(Text) gettext (Text)
  33 #else
  34 # define _(Text) Text
  35 #endif
  36
  37 static struct option const long_options[] =
  38 {
  39   {"help", no_argument, 0, 'h'},
  40   {"version", no_argument, 0, 'v'},
  41   {0, 0, 0, 0}
  42 };
  43
  44 /* Process long options --help and --version, but only if argc == 2.
  45    Be careful not to gobble up `--'.  */
  46
  47 void
  48 parse_long_options (int argc,
  49                     char **argv,
  50                     const char *command_name,
  51                     const char *package,
  52                     const char *version,
  53                     const char *authors,
  54                     void (*usage_func)())
  55 {
  56   int c;
  57   int saved_opterr;
  58
  59   saved_opterr = opterr;
  60
  61   /* Don't print an error message for unrecognized options.  */
  62   opterr = 0;
  63
  64   if (argc == 2
  65       && (c = getopt_long (argc, argv, "+", long_options, NULL)) != -1)
  66     {
  67       switch (c)
  68         {
  69         case 'h':
  70           (*usage_func) (0);
  71
  72         case 'v':
  73           version_etc (stdout, command_name, package, version, authors);
  74           close_stdout (); /* FIXME: output failure exit status
  75                               should be settable via an arg.  */
  76           exit (0);
  77
  78         default:
  79           /* Don't process any other long-named options.  */
  80           break;
  81         }
  82     }
  83
  84   /* Restore previous value.  */
  85   opterr = saved_opterr;
  86
  87   /* Reset this to zero so that getopt internals get initialized from
  88      the probably-new parameters when/if getopt is called later.  */
  89   optind = 0;
  90 }