/*
 * 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) and placed
 * in the Pubic Domain for your edification and enjoyment.
 * MS-DOS port 2/87 by Eric Roskos.
 * Minix  port 3/88 by Eric Roskos.
 *
 * @(#)getoldopt.c 1.4 2/4/86 Public Domain - gnu
 */

#include <stdio.h>


int
getoldopt(argc, argv, optstring)
int             argc;
char          **argv;
char           *optstring;
{
	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 == '-')
			use_getopt++;
		else
			optind = 2;
	}

	if (use_getopt)
		return getopt(argc, argv, optstring);

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

	if (place == NULL || c == ':')
	{
		fprintf(stderr, "%s: unknown option %c\n", argv[0], c);
		return ('?');
	}

	place++;
	if (*place == ':')
	{
		if (optind < argc)
		{
			optarg = argv[optind];
			optind++;
		}
		else
		{
			fprintf(stderr, "%s: %c argument missing\n",
				argv[0], c);
			return ('?');
		}
	}

	return (c);
}