On Sat, 26 Mar 2022 at 12:24, Andres Freund <and...@anarazel.de> wrote:
> NULL can never be part of the same "array object" or one past past the last > element as the pointer it is subtracted from. Hence the undefined beaviour. > Even more fundamentally, NULL is not 0 in any ordinary mathematical sense, even though it can be written 0 in source code and is often (but not always) represented in memory as an all-0s bit pattern. I'm not at all surprised to learn that arithmetic involving NULL is undefined.
