linux-kernel - Re: [PATCH v1 1/1] lib/vsprintf: refactor duplicate code to xnumber()

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Message-ID: <87d1tq43ll.fsf@rasmusvillemoes.dk>
Date:	Mon, 28 Dec 2015 23:20:54 +0100
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Joe Perches <joe@...ches.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] lib/vsprintf: refactor duplicate code to xnumber()

On Mon, Dec 28 2015, Rasmus Villemoes <linux@...musvillemoes.dk> wrote:

>
> Is there any aspect of the passed-through printf_spec which isn't
> overridden in xnumber? The users are/will be various %p extensions,
> which probably means that no-one passes a non-default precision (gcc
> complains about %.*p), and the remaining possible flags (PLUS, LEFT,
> SPACE) are useless and/or impossible to pass to %p

Actually, LEFT can be passed to %p (or get set by passing a negative
field width via %*p), which would be actively harmful: When LEFT is set,
number() explicitly removes the ZEROPAD flag, so we'd get "0xabcdef  "
instead of "0x00abcdef".
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