What does malloc(0) return?

[Phil Howard KA9WGN]

steve at unidata.ucar.edu (Steve Emmerson) writes:

>Greetings,
>
>The subject-line says it all and my K&R2 is silent on the matter.
>Is the answer NULL, non-NULL (but don't dereference), undefined,
>or implementation-defined?

If it did return the address of somewhere in memory, you cannot
dereference that pointer without exceeding the size.

It would be more useful if it did return something consistent like NULL.
Prior to this posting, had I needed to implement malloc(0) I am sure
I would have just implemented it to return NULL in that case unless
I found a reason not to.
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