Path: utzoo!attcan!uunet!mcsun!mcvax!hp4nl!targon!ruud
From: ruud@targon.UUCP (Ruud Harmsen)
Newsgroups: comp.lang.c
Subject: Re: "do ... while ((NULL + 1) - 1);" -- valid C?
Message-ID: <602@targon.UUCP>
Date: 22 Aug 89 09:09:00 GMT
References: <1043@levels.sait.edu.au> <961@virtech.UUCP> <10684@smoke.BRL.MIL> <940@lakesys.UUCP> <18996@mimsy.UUCP> <597@targon.UUCP> <781@janus.UUCP>
Reply-To: ruud@targon.UUCP (Ruud Harmsen)
Organization: Nixdorf Computer BV., DO, P.O. Box 29,Vianen, The Netherlands
Lines: 12

In article <781@janus.UUCP> casper@fwi.uva.nl (Casper H.S. Dik) writes:
>> The char-pointer gets its value from malloc, and I never change that char-
>> pointer other than by adding multiples of sizeof(int) to it.  Is a "ip =
>> cp" guaranteed safe under these conditions, so can I ignore the compiler-
>> warning?
>No. It is not safe. If you ever want to run your program on a Data General
>MV, among others, you should use "ip = (int *) cp".

You're right, of course.  As a matter of fact, I did use the cast in my
program.  Sorry I didn't mention that in the original article.

	Ruud Harmsen