Date: Wed, 17 Oct 2001 10:53:42 -0700 From: "Chad R. Larson" <chad@DCFinc.com> To: Gregory Bond <gnb@itga.com.au> Cc: Zero Sum <count@shalimar.net.au>, Greg Black <gjb@gbch.net>, cjclark@alum.mit.edu, "Crist J. Clark" <cristjc@earthlink.net>, Heath Nielson <heath@cs.byu.edu>, Warner Losh <imp@harmony.village.org>, David Marker <marker_d@yahoo.com>, freebsd-stable@FreeBSD.ORG Subject: Re: setenv() cores with NULL value [was Re: Gdm proplem on 4.4] Message-ID: <20011017105342.A26621@freeway.dcfinc.com> In-Reply-To: <200110170533.PAA22928@lightning.itga.com.au>; from gnb@itga.com.au on Wed, Oct 17, 2001 at 03:33:49PM %2B1000 References: <200110170533.PAA22928@lightning.itga.com.au>
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On Wed, Oct 17, 2001 at 03:33:49PM +1000, Gregory Bond wrote:
> Dereferencing NULL pointers has been illegal C since the day C was
> invented. See if you can dig up K&R 1st edition (I've lost mine over
> the years...)
So, I'm more of a packrat than you. Quoting from K&R first edition
(the white book [which in my case is tending toward yellow...])
chapter 5 "Pointers and Arrays" we get
A pointer is a variable that contains the address of another
variable. ... C guarantees that no pointer that validly points
to data will contain zero ... We write NULL instead of zero,
however, to indicate more clearly that this is a special value
for a pointer.
Can we be done with this now? Or move to chat?
-crl
--
Chad R. Larson (CRL15) 602-953-1392 Brother, can you paradigm?
chad@dcfinc.com chad@larsons.org larson1@home.com
DCF, Inc. - 14623 North 49th Place, Scottsdale, Arizona 85254-2207
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