linux-kernel - Re: [PATCH] x86: small unifications of address printing

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Message-ID: <19f34abd0807011146g2bb8baf0q2dbaa9ebe501657e@mail.gmail.com>
Date:	Tue, 1 Jul 2008 20:46:24 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: small unifications of address printing

On Tue, Jul 1, 2008 at 8:29 PM, Andi Kleen <andi@...stfloor.org> wrote:
> Vegard Nossum <vegard.nossum@...il.com> writes:
>
>> 'man 3 printf' tells me that %p should be printed as if by %#x, but
>> this is not true for the kernel, which does not use the '0x' prefix
>> for the %p conversion specifier.
>
> Problem is that %p will not pad to 8/16 digits. Addresses are traditionally
> padded.

Yes, it will, and correctly too:

        case 'p':
                flags |= SMALL;
                if (field_width == -1) {
                        field_width = 2*sizeof(void *);
                        flags |= ZEROPAD;
                }

Or did I read this code wrong? field_width is initialized to -1 by
default unless overridden. The SMALL flag means lowercase hexadecimal
digits.


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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