getoldopt.c

speech signal process tools

/* Replacement for getopt() that can be used by tar.
   Copyright (C) 1988 Free Software Foundation

This file is part of GNU Tar.

GNU Tar 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 1, or (at your option)
any later version.

GNU Tar 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 GNU Tar; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/*
 * Plug-compatible replacement for getopt() for parsing tar-like
 * arguments.  If the first argument begins with "-", it uses getopt;
 * otherwise, it uses the old rules used by tar, dump, and ps.
 *
 * Written 25 August 1985 by John Gilmore (ihnp4!hoptoad!gnu)
 *
 * @(#)getoldopt.c 1.4 2/4/86 - gnu
 */

#include <stdio.h>
#include "getopt.h"

int
getoldopt(argc, argv, optstring, long_options, opt_index)
	int	argc;
	char	**argv;
	char	*optstring;
	struct option *long_options;
	int 	*opt_index;
{
	extern char	*optarg;	/* Points to next arg */
	extern int	optind;		/* Global argv index */
	static char	*key;		/* Points to next keyletter */
	static char	use_getopt;	/* !=0 if argv[1][0] was '-' */
	extern char	*index();
	char		c;
	char		*place;

	optarg = NULL;
	
	if (key == NULL) {		/* First time */
		if (argc < 2) return EOF;
		key = argv[1];
		if ((*key == '-') || (*key == '+'))
			use_getopt++;
		else
			optind = 2;
	}

	if (use_getopt)
		return getopt_long(argc, argv, optstring, 
				   long_options, opt_index);

	c = *key++;
	if (c == '\0') {
		key--;
		return EOF;
	}
	place = index(optstring, c);

	if (place == NULL || c == ':') {
		msg("unknown option %c", c);
		return('?');
	}

	place++;
	if (*place == ':') {
		if (optind < argc) {
			optarg = argv[optind];
			optind++;
		} else {
			msg("%c argument missing", c);
			return('?');
		}
	}

	return(c);
}