memcmp?

u32_t memcmp()
{

if(z == 0)
{
    return (z-1);  // return -1 if there's nothing to compare
}

for(z = y; z >= 0; z--)
{
    if(*offset1 == *offset2)
        {
          offset1++;
          offset2++;
        }

    else
        {
          return (*offset1 - *offset2); // return the length into the compare that the difference started(if the 2 aren't the same)
        }
}

return z; // return 0 if the compare was successful
}