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From: brooks@lll-crg.ARpA (Eugene D. Brooks III)
Newsgroups: net.lang.c
Subject: Re: if(p)
Message-ID: <894@lll-crg.ARpA>
Date: Fri, 4-Oct-85 21:45:44 EDT
Article-I.D.: lll-crg.894
Posted: Fri Oct  4 21:45:44 1985
Date-Received: Sat, 5-Oct-85 14:58:11 EDT
References: <1671@brl-tgr.ARPA> <516@talcott.UUCP> <2245@ukma.UUCP> <1899@brl-tgr.ARPA>
Reply-To: brooks@lll-crg.UUCP (Eugene D. Brooks III)
Organization: Lawrence Livermore Labs, CRG Group
Lines: 3

Yep, if(p) tests to see if p is a valid pointer, valid in the sense that
it point somewhere.  Of course it may point to a location that will dump core.
If it very unfortunate that on a VAX a NULL pointer does not dump core.