/*
 * Copyright 2010 by egnite GmbH
 *
 * 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. Neither the name of the copyright holders nor the names of
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT OWNER 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.
 *
 * For additional information see http://www.ethernut.de/
 */

/*
 * \file gorp/list/lstrcmp.c
 * \brief Linked list string compare helper function.
 *
 * \verbatim
 * $Id$
 * \endverbatim
 */

#include <string.h>
#include <gorp/lili.h>

/*!
 * \addtogroup xgLili
 */
/*@{*/

/*!
 * \brief Compare two string items.
 *
 * A pointer to this function can be passed to LiLiCreate(), if the items
 * of a sorted list are simple strings.
 *
 * \param ref1 Reference of the first string.
 * \param ref2 Reference of the second string.
 *
 * \return An integer less than, equal to, or greater than zero, if the
 *         first string is less than, equal, or greater than the second
 *         string, resp.
 */
int LiLiCompareStringItems(LILI_ITEMREF ref1, LILI_ITEMREF ref2)
{
    if (ref1 && ref2) {
        return strcmp((char *)ref1, (char *)ref2);
    }
    /* NULL pointers are considered less than empty strings. */
    return ref1 - ref2;
}

/*@}*/