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From: karl@haddock.UUCP (Karl Heuer)
Newsgroups: comp.lang.c
Subject: Re: Determing alignment of (char *) pointer
Message-ID: <189@haddock.UUCP>
Date: Tue, 9-Dec-86 22:43:30 EST
Article-I.D.: haddock.189
Posted: Tue Dec  9 22:43:30 1986
Date-Received: Wed, 10-Dec-86 10:57:58 EST
References: <1510@mit-trillian.MIT.EDU>
Reply-To: karl@haddock.ISC.COM.UUCP (Karl Heuer)
Organization: Interactive Systems, Boston
Lines: 11
Summary: All of the above

In article <1510@mit-trillian.MIT.EDU> newman@athena.mit.edu (Ron Newman) writes:
>Which is a better, more portable way of determining whether a pointer
>[char *p] is aligned?

Several answers have been proposed, each of which fails on some machine.
I had this same situation a while back, and I solved it with the "most
portable" method:  "if (isaligned(p)) ...".  I then wrote the isaligned()
macro, and put it in a header file with a big comment.  Now the code works
on any machine, as long as I keep that header file up-to-date.

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