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From: earleh@eleazar.dartmouth.edu (Earle R. Horton)
Newsgroups: comp.sys.ibm.pc,comp.sys.intel
Subject: Re: correct code for pointer subtraction
Message-ID: <11477@dartvax.Dartmouth.EDU>
Date: 15 Dec 88 04:58:15 GMT
References: <15813@iuvax.cs.indiana.edu>
Sender: news@dartvax.Dartmouth.EDU
Reply-To: earleh@eleazar.dartmouth.edu (Earle R. Horton)
Organization: Thayer School of Engineering
Lines: 16

In article <15813@iuvax.cs.indiana.edu> bobmon@iuvax.UUCP (RAMontante) writes:
...
>So I agree with Bill Davidsen that the rigorous way to do this is to
>cast the pointers to huge, and subtract the casts.  Viz., 
...

I don't think anyone has suggested this, but perhaps casting to long
might be a better way to do this, and portable, too!  I don't do much
8086 stuff, but a long int is the same size as a long pointer on just
about every system I have run across.  Subtraction of longs is never a
questionable operation, either, whereas pointer subtraction sometimes
is...


Earle R. Horton. 23 Fletcher Circle, Hanover, NH 03755
(603) 643-4109
Graduate student.