On Sat, Feb 08, 2014 at 10:49:40AM +0100, David Kastrup wrote:
> But please note that since sb->lineno originally comes from a zeroed
> memory area and is passed to xrealloc, this requires that after
> int *p;
> memset(&p, 0, sizeof(p));
> the equivalence
> ((void *)p == NULL)
> will hold. While this is true on most platforms, and while the C
> standard guarantees the slightly different
> ((void *)0 == NULL)
> is true, it makes no statement concerning the memory representation of
> the NULL pointer.
> I have not bothered addressing this non-compliance with the C standard
> as it would be polishing a turd. A wholesale replacement has already
> been proposed, and it's likely that this assumption is prevalent in the
> Git codebase elsewhere anyway.
Yes, we explicitly break this part of the standard in the name of
practicality (it simplifies frequently-used code, and machines on which
it matters are rare enough that nobody has ever complained about it).
So I do not think this is a problem.
However, is there a reason not to use:
to avoid type-mismatch errors entirely (this applies both to this patch,
and to any proposed rewrites using malloc).
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