From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <b9fb0afe262868177d6202338cf1eff1@terzarima.net>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] ulong
From: Charles Forsyth <forsyth@terzarima.net>
Date: Tue, 17 Jan 2006 09:59:37 +0000
In-Reply-To: <ee9e417a0601161735g1961295bgee6af7cfb5021a31@mail.gmail.com>
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> (vlong)(...|((p)[3]<<24)) sign extends.  Casting the (p)[0]
> to (ulong) has the effect of making the whole 32-bit expression
> unsigned on 32-bit systems, but if ulong is 64 bits, then
> you'll still sign-extend ((p)[3]<<24) during the convertsion
> from int to ulong.

i'd be careful to define ulong to be 32 bits for all plan 9 source
including p9p (using `ulong == unsigned int' if necessary).
otherwise quite a bit more will break.
having fcall.h use u32int is fine too, of course, just to make the point clearer