Mercurial > gnulib
diff lib/long-options.c @ 317:b4df8eb979b6
Initial revision
author | Jim Meyering <jim@meyering.net> |
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date | Sun, 02 Oct 1994 22:50:11 +0000 |
parents | |
children | 8461c3b8595a |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/lib/long-options.c Sun Oct 02 22:50:11 1994 +0000 @@ -0,0 +1,79 @@ +/* Utility to accept --help and --version options as unobtrusively as possible. + Copyright (C) 1993, 1994 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 2, 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, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Jim Meyering (meyering@comco.com) */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <getopt.h> +#include "long-options.h" + +static struct option const long_options[] = +{ + {"help", no_argument, 0, 'h'}, + {"version", no_argument, 0, 'v'}, + {0, 0, 0, 0} +}; + +/* Process long options --help and --version, but only if argc == 2. + Be careful not to gobble up `--'. */ + +void +parse_long_options (argc, argv, command_name, version_string, usage) + int argc; + char **argv; + const char *command_name; + const char *version_string; + void (*usage)(); +{ + int c; + int saved_opterr; + int saved_optind; + + saved_opterr = opterr; + saved_optind = optind; + + /* Don't print an error message for unrecognized options. */ + opterr = 0; + + if (argc == 2 + && (c = getopt_long (argc, argv, "+", long_options, (int *) 0)) != EOF) + { + switch (c) + { + case 'h': + (*usage) (0); + + case 'v': + printf ("%s - %s\n", command_name, version_string); + exit (0); + + default: + /* Don't process any other long-named options. */ + break; + } + } + + /* Restore previous value. */ + opterr = saved_opterr; + + /* Restore optind in case it has advanced past a leading `--'. */ + optind = saved_optind; +}