Xref: utzoo comp.arch:4933 comp.lang.c:10296
Path: utzoo!attcan!uunet!mcvax!unido!iaoobelix!woerz
From: woerz@iaoobelix.UUCP (Dieter Woerz)
Newsgroups: comp.arch,comp.lang.c
Subject: Re: negative addresses
Message-ID: <168@iaoobelix.UUCP>
Date: 20 May 88 12:41:30 GMT
References: <2393@uvacs.CS.VIRGINIA.EDU> <21541@amdcad.AMD.COM> <1988May12.162906.16901@utzoo.uucp> <7881@brl-smoke.ARPA> <10001@tekecs.TEK.COM>
Reply-To: woerz@iaoobelix.UUCP (Dieter Woerz)
Organization: Fraunhofer Institut fuer Arbeitswirtschaft und Organisation
Lines: 37
Posted: Fri May 20 13:41:30 1988

In article <10001@tekecs.TEK.COM> andrew@frip.gwd.tek.com (Andrew Klossner) writes:
> ...
>In routine ttout:
>
>		if (tbuf->c_ptr)
>
>appears twice.  (And in the same routine,
>
>		if (tbuf->c_ptr == NULL)
>
>appears twice.  Multiple hackers have clogged through here.)
>
>In routine ttioctl:
>
>		if (tp->t_rbuf.c_ptr) {
>		if (tp->t_tbuf.c_ptr) {
> ...

I have to admit, that the others may not work, but I think you should
be able to tweak the compilers for that architecture to do a
comparision of such pointers with the Zero-Pointer of that
architecture, which is not necessaryly zero.

The second example is should work simply if you redefine NULL to the
value of the Zero-Pointer.

------------------------------------------------------------------------------

Dieter Woerz
Fraunhofer Institut fuer Arbeitswirtschaft und Organisation
Abt. 453
Holzgartenstrasse 17
D-7000 Stuttgart 1
W-Germany

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