2.3-InternetRadio/nutos/nut/gorp/list/lstrcmp.c

/*
 * Copyright 2010 by egnite GmbH
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 *    documentation and/or other materials provided with the distribution.
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 *    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
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/*
 * \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;
}

/*@}*/