/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

/*	$OpenBSD: strsep.c,v 1.3 1997/08/20 04:28:14 millert Exp $	*/

/*

 * Copyright (c) 1990, 1993

 *	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.

 */

#include "lint.h"

#include <string.h>

#include <stdio.h>

#if defined(LIBC_SCCS) && !defined(lint)

#if 0

static char sccsid[] = "@(#)strsep.c	8.1 (Berkeley) 6/4/93";

#else

static char *rcsid =

	"$OpenBSD: strsep.c,v 1.3 1997/08/20 04:28:14 millert Exp $";

#endif

#endif /* LIBC_SCCS and not lint */

/*

 * Get next token from string *stringp, where tokens are possibly-empty

 * strings separated by characters from delim.

 *

 * Writes NULs into the string at *stringp to end tokens.

 * delim need not remain constant from call to call.

 * On return, *stringp points past the last NUL written (if there might

 * be further tokens), or is NULL (if there are definitely no more tokens).

 *

 * If *stringp is NULL, strsep returns NULL.

 */

char *

strsep(char **stringp, const char *delim)

{

	register char *s;

	register const char *spanp;

	register int c, sc;

	char *tok;

	if ((s = *stringp) == NULL)

		return (NULL);

	for (tok = s; ; ) {

		c = *s++;

		spanp = delim;

		do {

			if ((sc = *spanp++) == c) {

				if (c == 0)

					s = NULL;

				else

					s[-1] = 0;

				*stringp = s;

				return (tok);

			}

		} while (sc != 0);

	}

	/* NOTREACHED */

}