Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!xanth!mcnc!decvax!ima!haddock!karl
From: karl@haddock.ima.isc.com (Karl Heuer)
Newsgroups: comp.lang.c
Subject: Re: Memory Models
Message-ID: <14446@haddock.ima.isc.com>
Date: 28 Aug 89 00:06:47 GMT
References: <664@philmtl.philips.ca> <2694@cbnewsc.ATT.COM> <671@philmtl.philips.ca>
Reply-To: karl@haddock.ima.isc.com (Karl Heuer)
Organization: Interactive Systems, Cambridge, MA 02138-5302
Lines: 16

In article <671@philmtl.philips.ca> ray@philmtl.philips.ca (Raymond Dunn) writes:
>[In huge model] there are obvious difficulties with sizeof and pointer
>subtraction unless the appropriate cast is used.  This is of course a
>consequence of an int being 16 bits, not of the segmentation.

If the vendor would implement Real ANSI C instead of a close approximation
that coddles to existing code that assumes too much about array sizes, these
difficulties would go away.  The correct typedefs for huge model are:
	typedef unsigned long int size_t;
	typedef long int ptrdiff_t;
With these in place, everything works fine without casts (provided the user is
actually using these types, and not assuming that |int| always works).  An
implementation that always typedefs size_t to be a 16-bit object, and requires
the user to attach a cast to sizeof() in huge model, is BROKEN.

Karl W. Z. Heuer (ima!haddock!karl or karl@haddock.isc.com), The Walking Lint