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Re: sparse (static analyzer) report

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Greg Stark <gsstark(at)mit(dot)edu>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: sparse (static analyzer) report
Date: 2005-01-15 08:02:45
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Lists: pgsql-hackers
Greg Stark <gsstark(at)mit(dot)edu> writes:
> Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl> writes:
>> Hmm.  Well, it showed the multiple incorrect uses of 0 as NULL in
>> dllist.c and other places, 

> Incidentally, while it may not be conformant to your style guidelines, use of
> the constant 0 compared to or assigned to a pointer is a perfectly valid ANSI
> spelling for NULL.

Absolutely.  But I agree that it is more readable to use NULL when you
mean a null pointer, and 0 when you mean an integer zero.  The C
standard may not distinguish these concepts, but I do ;-)

Something that I don't have a real strong feeling about is
	if (ptr != NULL)
	if (ptr)
I've been known to write both.  Can anyone mount a good readability
argument for one over the other?

How about the inverse case,
	if (ptr == NULL)
	if (!ptr)
Applying a boolean ! to a pointer seems a bit shaky to me, though
it's certainly a common locution.

			regards, tom lane

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