linux-kernel - Re: [PATCH v2] vsprintf: add Bluetooth UUID %pU[rR] format specifier

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Date:	Mon, 21 Oct 2013 00:14:00 -0700
From:	Joe Perches <joe@...ches.com>
To:	Marcel Holtmann <marcel@...tmann.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] vsprintf: add Bluetooth UUID %pU[rR] format specifier

On Sun, 2013-10-20 at 13:36 -0700, Marcel Holtmann wrote:
> The Bluetooth UUID is used in big endian reversed order. Add new
> modifier to print a UUID in big endian, but where the input byte
> stream is actually in reversed order.

Thanks Marcel.

This looks fine to me but for one nit that you
didn't add.

> diff --git a/Documentation/printk-formats.txt b/Documentation/printk-formats.txt
[]
> @@ -159,12 +159,18 @@ UUID/GUID addresses:
>  	%pUB	00010203-0405-0607-0809-0A0B0C0D0E0F
>  	%pUl	03020100-0504-0706-0809-0a0b0c0e0e0f
>  	%pUL	03020100-0504-0706-0809-0A0B0C0E0E0F
> +	%pUr	0f0e0d0c-0b0a-0908-0706-050403020100
> +	%pUR	0F0E0D0C-0B0A-0908-0706-050403020100
>  
>  	For printing 16-byte UUID/GUIDs addresses. The additional 'l', 'L',
>  	'b' and 'B' specifiers are used to specify a little endian order in
>  	lower ('l') or upper case ('L') hex characters - and big endian order
>  	in lower ('b') or upper case ('B') hex characters.
>  
> +	The additional 'r' and 'R' specifiers are used to specify reversed
> +	big endian order in either lower ('r') or upper case ('R') hex
> +	characters. This is useful for Bluetooth UUID addresses.
> +
>  	Where no additional specifiers are used the default little endian
>  	order with lower case hex characters will be printed.

The default is actually big endian lower case

It'd be nice to fix after this is accepted.

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