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From: forys@sigi.Colorado.EDU (Jeff Forys)
Newsgroups: comp.unix.questions
Subject: Re: Shutting lint up about malloc (missing /*NOSTRICT*/)
Message-ID: <1117@sigi.Colorado.EDU>
Date: Mon, 18-May-87 16:57:08 EDT
Article-I.D.: sigi.1117
Posted: Mon May 18 16:57:08 1987
Date-Received: Tue, 19-May-87 04:44:25 EDT
References: <61@amanue.UUCP> <1994@a.cs.okstate.edu>
Reply-To: forys@boulder.Colorado.EDU (Jeff Forys)
Organization: University of Colorado, Boulder
Lines: 19

In article <1994@a.cs.okstate.edu> gregg@a.cs.okstate.edu
(Gregg Wonderly) writes:
> Try [casting the NULL pointer] making this
>    if ((p = (struct foo*) malloc(sizeof(struct foo))) == (struct foo *)NULL) {
>        (void) fprintf(stderr, "Out er memory, turkey\n");
>        return NULL;
>    }
> Comparing a structure pointer (namely p) against NULL (sometimes declared
> as ((char *)0) is probably biting you.

No, that's perfectly legal without casting NULL -- unless the C compiler is
brain damaged (K&R, pg 98).  The problem here is 2 fold:
1) His version of lint doesnt know that the C compiler will align pointers
   to differnt types (4.3BSD lint understands this).
2) the /*NOSTRICT*/ directive is probably not implemented in his version of
   lint (it's unimplemented in 4.3BSD as well).
---
Jeff Forys @ UC/Boulder Engineering Research Comp Cntr (303-492-6096)
forys@Boulder.Colorado.EDU  -or-  ..!{hao|nbires}!boulder!forys