/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1988 AT&T */
/*        All Rights Reserved   */

/*
 *      This is exactly strtok(3C).
 *      It is here, with a different name, because using strtok() within
 *      the scope of errverb() can cause the loss of a currently remembered
 *      string(savept).
 */

/*
 * uses strpbrk and strspn to break string into tokens on
 * sequentially subsequent calls.  returns NULL when no
 * non-separator characters remain.
 * `subsequent' calls are calls with first argument NULL.
 */

#include <string.h>

char *
errstrtok(char *string, char *sepset)
{
        char    *p, *q, *r;
        static char     *savept;

        /* first or subsequent call */
        p = (string == NULL)? savept: string;

        if (p == 0)             /* return if no tokens remaining */
                return (NULL);

        q = p + strspn(p, sepset);      /* skip leading separators */

        if (*q == '\0')         /* return if no tokens remaining */
                return (NULL);

        if ((r = strpbrk(q, sepset)) == NULL)   /* move past token */
                savept = 0;     /* indicate this is last token */
        else {
                *r = '\0';
                savept = ++r;
        }
        return (q);
}