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Date: Fri, 14 Sep 2012 16:25:15 +0200 (CEST)
From: Jan Engelhardt <jengelh@inai.de>
To: Jim Rees <rees@umich.edu>
cc: Bernd Petrovitsch <bernd@petrovitsch.priv.at>,
        "J. Bruce Fields" <bfields@fieldses.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] strings: helper for maximum decimal encoding of an
 unsigned integer
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On Friday 2012-09-14 15:46, Jim Rees wrote:

>Jan Engelhardt wrote:
>
>  >A pure K&R-C version would use a string:
>  >#define base10len(i) "\0x1\0x3\0x5\0x8\0x0A\0x0D\0x0F\0x11\0x14"[sizeof(i)]
>  >(if I converted them properly into hexadecimal)
>  The syntax is \x01\x03\x05...
>
>K&R doesn't have the \x escape, only \0 (octal).

People recommend K&R only for the introductory reading, not for its 
actuality.