Erik Faye-Lund <> writes:

> I don't see how it's undefined. It's using the memory that 'pos'
> *points to* that is undefined, no? The difference between 'pos' and
> 'str' should still be the same, it's not like realloc somehow
> magically updates 'pos'...

It does.  Think of segmented architectures, where freeing a pointer
invalidates its segment, so that even loading the value of the pointer
traps.  Probably no such architecture is in use any more, though.


Andreas Schwab,
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