Path: utzoo!attcan!uunet!decwrl!bacchus.pa.dec.com!news.crl.dec.com!decvax.dec.com!zinn!siia!drd
From: drd@siia.mv.com (David Dick)
Newsgroups: comp.os.minix
Subject: Re: stdio.h : NULL
Message-ID: <1990Oct25.170403.17449@siia.mv.com>
Date: 25 Oct 90 17:04:03 GMT
References: <32108@nigel.ee.udel.edu>
Organization: Software Innovations, Inc.
Lines: 22

In <32108@nigel.ee.udel.edu> UPSYF173%DBIUNI11.BITNET@cunyvm.cuny.edu (Wolfgang Thiel) writes:


>     Hi,
>         #ifdef NULL
>         #undef NULL
>         #endif
>         ...
>         #define NULL 0
>This really is bad!! It took me more than 2 hours with mdb to find out why
>the program crashed. Of course, my machine's pointer size is not
>sizeof int. Doesn't   #define NULL  ((void *)0)  do the job an any machine?
>Or do I miss something?
>                             Wolfgang Thiel

First, "void *" is not available on all machines.  Second,
0 is legal C for "null pointer" in *all* cases except when
a pointer is passed as an argument to a function.  If this
is not true for a particular compiler, the compiler is broken.

David Dick
Software Innovations, Inc. [the Software Moving Company (sm)]