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Date: Tue, 25 Jan 2011 09:23:41 +0100
From: Jiri Slaby <jslaby@suse.cz>
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To: Andreas Mohr <andi@lisas.de>
CC: Takashi Iwai <tiwai@suse.de>, jirislaby@gmail.com, perex@perex.cz,
        alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
        Andy Whitcroft <apw@canonical.com>
Subject: Re: [PATCH] azt3328: repair breakage (Re: [PATCH 1/1] SOUND: azt3328,
 fix broken AZF_FMT_XLATE macro)
References: <1295704570-27015-1-git-send-email-jslaby@suse.cz> <s5h1v44j45c.wl%tiwai@suse.de> <20110125054631.GA10984@rhlx01.hs-esslingen.de>
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On 01/25/2011 06:46 AM, Andreas Mohr wrote:
> It is also quite interesting to note that this rather uncommon language syntax
> (do...while(0) within switch scope) compiled cleanly without issue
> (no warnings).

Note that the switch block is the same like the others and case and
default and very similar to goto labels. You can even do:
switch (x) {
int abc;
{ case 5: abc = 7; break; }
do { case 3: abc = 5; break; } while (0);
while (1) {
        printf("%d\n", abc);
default:
        abc = 1;
}
}
And check what it will do for x == 3, 5, and others :).

regards,
-- 
js
suse labs