linux-kernel - Re: [PATCH] azt3328: repair breakage (Re: [PATCH 1/1] SOUND: azt3328, fix broken AZF_FMT

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Message-ID: <4D3E888D.60909@suse.cz>
Date:	Tue, 25 Jan 2011 09:23:41 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Andreas Mohr <andi@...as.de>
CC:	Takashi Iwai <tiwai@...e.de>, jirislaby@...il.com, perex@...ex.cz,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Andy Whitcroft <apw@...onical.com>
Subject: Re: [PATCH] azt3328: repair breakage (Re: [PATCH 1/1] SOUND: azt3328,
 fix broken AZF_FMT_XLATE macro)

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
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