Hi Werner,
> > I got two letters back, saying that malloc(0) is illegal because
> > zero-length arrays are illegal, and the other vice versa.
>
> And now we have zero length arrays an UB malloc(0).
malloc(0) isn't undefined behaviour but implementation defined.
In modern C there is no difference between those two concepts.
Are there prominent modern implementations which consider it an error so
return NULL?
Many. There are a dozen or more malloc implementations in use and they all are slightly different.
Warner
Warner