text: /* Utility to accept --help and --version options as unobtrusively as possible.
  
     Copyright (C) 1993-1994, 1998-2000, 2002-2006, 2009-2015 Free Software
     Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  /* Written by Jim Meyering.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include "long-options.h"
  
  #include <stdarg.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <getopt.h>
  
  #include "version-etc.h"
  
  static struct option const long_options[] =
  {
    {"help", no_argument, NULL, 'h'},
    {"version", no_argument, NULL, 'v'},
    {NULL, 0, NULL, 0}
  };
  
  /* Process long options --help and --version, but only if argc == 2.
     Be careful not to gobble up "--".  */
  
  void
  parse_long_options (int argc,
                      char **argv,
                      const char *command_name,
                      const char *package,
                      const char *version,
                      void (*usage_func) (int),
                      /* const char *author1, ...*/ ...)
  {
    int c;
    int saved_opterr;
  
    saved_opterr = opterr;
  
    /* Don't print an error message for unrecognized options.  */
    opterr = 0;
  
    if (argc == 2
        && (c = getopt_long (argc, argv, "+", long_options, NULL)) != -1)
      {
        switch (c)
          {
          case 'h':
            (*usage_func) (EXIT_SUCCESS);
  
          case 'v':
            {
              va_list authors;
              va_start (authors, usage_func);
              version_etc_va (stdout, command_name, package, version, authors);
              exit (0);
            }
  
          default:
            /* Don't process any other long-named options.  */
            break;
          }
      }
  
    /* Restore previous value.  */
    opterr = saved_opterr;
  
    /* Reset this to zero so that getopt internals get initialized from
       the probably-new parameters when/if getopt is called later.  */
    optind = 0;
  }
  