~linaro-toolchain-dev/cortex-strings/trunk

/*

 * Copyright (C) 2008 The Android Open Source Project

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *  * Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *  * 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.

 *

 * 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.

 */

#include <string.h>

int memcmp(const void *s1, const void *s2, size_t n)

{

    const unsigned char*  p1   = s1;

    const unsigned char*  end1 = p1 + n;

    const unsigned char*  p2   = s2;

    int                   d = 0;

    for (;;) {

        if (d || p1 >= end1) break;

        d = (int)*p1++ - (int)*p2++;

        if (d || p1 >= end1) break;

        d = (int)*p1++ - (int)*p2++;

        if (d || p1 >= end1) break;

        d = (int)*p1++ - (int)*p2++;

        if (d || p1 >= end1) break;

        d = (int)*p1++ - (int)*p2++;

    }

    return d;

}