Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!yale!cmcl2!adm!smoke!gwyn
From: gwyn@smoke.brl.mil (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: Need macro to get offset within a structure
Message-ID: <15254@smoke.brl.mil>
Date: 19 Feb 91 23:35:38 GMT
References: <1991Feb16.232713.6001@runx.oz.au> <ENAG.91Feb19131201@holmenkollen.ifi.uio.no>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 7

In article <ENAG.91Feb19131201@holmenkollen.ifi.uio.no> enag@ifi.uio.no (Erik Naggum) writes:
>#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)

What I would recommend is to key on __STDC__, #including <stddef.h>
in a Standard C environment and using a definition like that one in
other environments.  It should work in most non-standard C environments
(but not all of them!).