Path: utzoo!utgpu!watmath!att!chinet!les
From: les@chinet.chi.il.us (Leslie Mikesell)
Newsgroups: comp.lang.c
Subject: Re: Invalid Pointers
Message-ID: <8990@chinet.chi.il.us>
Date: 18 Jul 89 03:55:55 GMT
References: <20245@adm.BRL.MIL> <4348@eos.UUCP> <10541@smoke.BRL.MIL>
Reply-To: les@chinet.chi.il.us (Leslie Mikesell)
Organization: Chinet - Public Access Unix
Lines: 12

In article <10541@smoke.BRL.MIL> gwyn@brl.arpa (Doug Gwyn) writes:

>-#define NO_FOOBAR ((struct foobar *) -1 )	is what I use, but...

>This is not portable.  Just use NULL.

Do you mean that there are machines that might return a valid -1 from
sbrk(2) or shmat(2), or that would misconstrue the comparsion of
a pointer to -1?  Yes, I know these are botches, but are they not
always accomodated?

Les Mikesell