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/* Utility to accept --help and --version options as unobtrusively as possible.
Copyright (C) 1993-1994, 1998-2000, 2002-2006, 2009-2021 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 <https://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"
#include "exitfail.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);
break;
case 'v':
{
va_list authors;
va_start (authors, usage_func);
version_etc_va (stdout, command_name, package, version, authors);
exit (EXIT_SUCCESS);
}
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;
}
/* Process the GNU default long options --help and --version (see also
https://gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html),
and fail for any other unknown long or short option.
Use with SCAN_ALL=true to scan until "--", or with SCAN_ALL=false to stop
at the first non-option argument (or "--", whichever comes first). */
void
parse_gnu_standard_options_only (int argc,
char **argv,
const char *command_name,
const char *package,
const char *version,
bool scan_all,
void (*usage_func) (int),
/* const char *author1, ...*/ ...)
{
int c;
int saved_opterr = opterr;
/* Print an error message for unrecognized options. */
opterr = 1;
const char *optstring = scan_all ? "" : "+";
if ((c = getopt_long (argc, argv, optstring, long_options, NULL)) != -1)
{
switch (c)
{
case 'h':
(*usage_func) (EXIT_SUCCESS);
break;
case 'v':
{
va_list authors;
va_start (authors, usage_func);
version_etc_va (stdout, command_name, package, version, authors);
exit (EXIT_SUCCESS);
}
default:
(*usage_func) (exit_failure);
break;
}
}
/* Restore previous value. */
opterr = saved_opterr;
}
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