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From: dan@prairie.UUCP (Daniel M. Frank)
Newsgroups: net.unix-wizards
Subject: Re: Microport Unix -- Large Model Problems
Message-ID: <347@prairie.UUCP>
Date: Mon, 3-Nov-86 09:32:33 EST
Article-I.D.: prairie.347
Posted: Mon Nov  3 09:32:33 1986
Date-Received: Tue, 4-Nov-86 05:05:00 EST
References: <188@vsedev.VSE.COM> <401@maynard.UUCP> <245@rabbit1.UUCP>
Reply-To: dan@prairie.UUCP (Daniel M. Frank)
Distribution: net
Organization: Prairie Computing, Madison, Wisconsin
Lines: 16
Keywords: Microport, Unix, Memory, Segmentation, lint

In article <245@rabbit1.UUCP> barber@rabbit1.UUCP (Steve Barber) writes:
>Another common problem is passing NULL as pointer argument.  NULL is
>#defined as 0, which is 2 bytes.  Large model pointers are 4 bytes, so
>the stack frame is now basically garbage.

   This isn't really true.  Code in stdio.h for the SV/286 release
checks your memory model, and if it is large, defines NULL to be 0L,
which is the same size as a pointer.  It doesn't please lint, so the
best solution is still to cast it as appropriate (like (char *)0),
but you ARE generally safe, as long as you include stdio.h.


-- 
    Dan Frank
    uucp: ... uwvax!prairie!dan
    arpa: dan%caseus@spool.wisc.edu