using 0 instead of NULL

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Article #74739

#74739

From: Kevin Boyes
Date: Sun, 03 Mar 1991 21:29

25 lines
1378 bytes

Hello all,

I am not sure if this is the right place for this but I'll try
it anyway.

I am very curious why so much of the GNU software that I see
tests for null pointers with 0 and not NULL.

In one case I am looking at right now, if NULL is not defined
they define it to be 0 but then proceed to test against 0 and
not the newly defined NULL. (this is in getopt.c from the bison
distribution)

Shouldn't NULL be defined to be ((char *)0) if not ((void *)0).
It is ((void *)0) on my system; QNX using an ANSI?? compiler.

Will someone please explain this?

					Thanks
					K.

-- 
-- 
Kevin Boyes                                     kevinb@maccs.dcss.McMaster.CA
McMaster University                         ...!uunet!utai!utgpu!maccs!kevinb

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From: kevinb@maccs.dcss.mcmaster.ca (Kevin Boyes)
Newsgroups: gnu.misc.discuss
Subject: using 0 instead of NULL
Message-ID: <27D16AC5.3952@maccs.dcss.mcmaster.ca>
Date: 3 Mar 91 21:29:40 GMT
Organization: McMaster University, Hamilton, Ontario, Canada
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