/*
 * Copyright (c) 1987, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
	#if 0
		static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
	#endif
		static const char rcsid[] = "$FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.2 1999/12/17 01:52:15 jkh Exp $";
#endif /* LIBC_SCCS and not lint */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int opterr = 1; /* if error message should be printed */
int optind = 1; /* index into parent argv vector */
int optopt;     /* character checked for validity */
int optreset;   /* reset getopt */
char  *optarg;  /* argument associated with option */


#define	BADCH	(int)'?'
#define	BADARG	(int)':'
#define	EMSG	""

/*
* getopt --
*	Parse argc/argv argument vector.
*/
#if defined(__cplusplus)
extern "C" 
#endif
int getopt(int nargc, char* const* nargv, const char* ostr)
{
	char *__progname = nargv[0];
	static char *place = EMSG;		/* option letter processing */
	char *oli;				/* option letter list index */
	int ret;

	if ( optreset || !*place )
	{		 /* update scanning pointer */
		optreset = 0;
		if ( optind >= nargc || *(place = nargv[optind]) != '-' )
		{
			place = EMSG;
			return(-1);
		}
		if ( place[1] && *++place == '-' )
		{	 /* found "--" */
			++optind;
			place = EMSG;
			return(-1);
		}
	}					/* option letter okay? */
	if ( (optopt = (int)*place++) == (int)':' || !(oli = strchr(ostr, optopt)) )
	{
		/*
		* if the user didn't specify '-' as an option,
		* assume it means -1.
		*/
		if ( optopt == (int)'-' )
			return(-1);
		if ( !*place )
			++optind;
		if ( opterr && *ostr != ':' )
			(void)fprintf(stderr,"%s: illegal option -- %c\n", __progname, optopt);
		return(BADCH);
	}
	if ( *++oli != ':' )
	{			 
		/* don't need argument */
		optarg = NULL;
		if ( !*place )
		{
			++optind;
		}
	}
	else
	{					 
		/* need an argument */
		if ( *place )			
		{
			/* no white space */
			optarg = place;
		}
		else if ( nargc <= ++optind )
		{	
			/* no arg */
			place = EMSG;
			if ( *ostr == ':' )
				ret = BADARG;
			else
				ret	= BADCH;
			if ( opterr )
				(void)fprintf(stderr,"%s: option requires an argument -- %c\n",__progname, optopt);
			return(ret);
		}
		else				
		{
			/* white space */
			optarg = nargv[optind];
		}
		place = EMSG;
		++optind;
	}
	return(optopt);			 /* dump back option letter */
}