Ajuda em trecho de código

int memcmp_signed;

int unsigned_memcmp( void *p1, void *p2, unsigned int i )
{
    unsigned char *pc1 = (unsigned char *) p1;
    unsigned char *pc2 = (unsigned char *) p2;
    while ( i-- ) {
        if ( *pc1 < *pc2 )
            return -1;
        else if ( *pc1++ > *pc2++ )
            return 1;
    }
    return 0;
}

bounded_compare( const unsigned int *i1,
                 const unsigned int *i2 )
{
    static int ticker = 0;
    if ( ( ticker++ % 4096 ) == 0 )
        fprintf( stderr, "." );
    unsigned int l1 = (unsigned int) ( length - *i1 );
    unsigned int l2 = (unsigned int) ( length - *i2 );
    int result;
    if ( memcmp_signed )
        result = unsigned_memcmp( buffer + *i1,
                                  buffer + *i2,
                                  l1 < l2 ? l1 : l2 );
    else
        result = memcmp( buffer + *i1,
                         buffer + *i2,
                         l1 < l2 ? l1 : l2 );
    if ( result == 0 )
        return l2 - l1;
    else
        return result;
};