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From: Keith Thompson <kst-u@mib.org>
Newsgroups: comp.lang.c
Subject: Re: Optimizing the code: way to reduce if, else if-s within the loop?
Date: Sun, 22 Jan 2017 07:44:57 -0800
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Alla _ <modelling.data@gmail.com> writes:
[...]
> But as I have spent quite a while trying to implement offsetof(), I
> would like to finish that one too, to find my mistakes, correct them
> and make the code work.

Are you trying to *implement* offsetof(), or are you trying to *use*
offsetof()?

If you're trying to implement it (i.e., write your own version), then
(a) it's not necessary, since all conforming C implementations provide
it in <stddef.h>, and (b) there is no completely portable way to
implement it (which is part of why it's defined in the standard
library).

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"