memcmp.c

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/*------------------------------------------------------------------------
 *  memcmp  -  Compare two equal-size blocks of memory.  If there are no
 *          differences, return 0.  Otherwise return >0 or <0
 *          if the first differing byte is greater or less
 *------------------------------------------------------------------------
 */
int memcmp(const void *s1, const void *s2, int n)
{
    const unsigned char *c1;
    const unsigned char *c2;

    for (c1 = s1, c2 = s2; n > 0; n--, c1++, c2++)
    {
        if (*c1 != *c2)
        {
            return ((int)*c1) - ((int)*c2);
        }
    }
    return 0;
}