linux-kernel - Re: [PATCH 1/9] lib/vsprintf.c: Add %pU to print UUID/GUIDs

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Message-Id: <1254874037.2134.311.camel@Joe-Laptop.home>
Date:	Tue, 06 Oct 2009 17:07:17 -0700
From:	Joe Perches <joe@...ches.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...ia.com>,
	Alex Elder <aelder@....com>,
	Artem Bityutskiy <dedekind@...radead.org>,
	Christoph Hellwig <hch@....de>,
	Harvey Harrison <harvey.harrison@...il.com>,
	Huang Ying <ying.huang@...el.com>, Ingo Molnar <mingo@...e.hu>,
	Jeff Garzik <jgarzik@...hat.com>,
	Laurent Pinchart <laurent.pinchart@...net.be>,
	Matt Mackall <mpm@...enic.com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Neil Brown <neilb@...e.de>,
	Steven Whitehouse <swhiteho@...hat.com>,
	xfs-masters@....sgi.com, "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 1/9] lib/vsprintf.c: Add %pU to print UUID/GUIDs

On Thu, 2009-10-01 at 10:55 +0200, Geert Uytterhoeven wrote:
> On Thu, Oct 1, 2009 at 09:26, Joe Perches <joe@...ches.com> wrote:
> > On Thu, 2009-10-01 at 09:10 +0200, Geert Uytterhoeven wrote:
> >> > Standardize the printed style of UUID/GUIDs by using
> >> > another extension to %p.
> >> > %pU:    01020304-0506-0708-090a-0b0c0d0e0f10
> >> > %pUr:   04030201-0605-0807-090a-0b0c0d0e0f10
> >> > %pU[r]X:Use upper case hex
> >> To me, it looks a bit strange to have the options after the `U', combined with
> >> the variable-length nature.
> > I think the whole %p<foo> mechanism is strange and takes
> > a bit of getting used to.
> > You're free to suggest alternatives.
> `r' is reverse endianness?
> So what about
>     %pUb: lower case big endian
>     %pUl: lower case little endian
>     %pUB: upper case big endian
>     %pUL: upper case little endian
> That way it's fixed length, and easier to parse.

Thanks Geert.

That's OK with me.
%pU now defaults to %pUb and I'll resubmit it later.

Anyone else?

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