PTRDIFF_T
if (((PTRDIFF_T)out == (PTRDIFF_T)in)
#ifdef PTRDIFF_T
PTRDIFF_T diff = (PTRDIFF_T)ptr1 - (PTRDIFF_T)ptr2;
int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) | (diff > (0 - (PTRDIFF_T)len)));