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

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Date:	Thu, 01 Oct 2009 00:26:40 -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 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.

Keep in mind expansion for future different types and that
<foo> must be alphanumeric chars only.

cheers, Joe

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