linux-kernel - Re: [PATCH] strings: helper for maximum decimal encoding of an unsigned integer

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Message-ID: <alpine.LNX.2.01.1209141456290.18169@frira.zrqbmnf.qr>
Date:	Fri, 14 Sep 2012 14:59:28 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...i.de>
To:	Bernd Petrovitsch <bernd@...rovitsch.priv.at>
cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-kernel@...r.kernel.org, Jim Rees <rees@...ch.edu>
Subject: Re: [PATCH] strings: helper for maximum decimal encoding of an
 unsigned integer


On Friday 2012-09-14 11:17, Bernd Petrovitsch wrote:
>Shouldn't that have been
>----  snip ----
>#define base10len(i) ((const int[]){1,3,5,8,10,13,15,17,20}[sizeof(i)])
>----  snip ----
Yeah.

>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...

>and that gives a "char"
>which is happily promoted to whatever one needs in that place.

So just convert it; there are no less than two ways to do so
 ((const unsigned char *)"\x01\x03...")[sizeof(i)]
 (boatfloating_t)("\x01\x03..."[sizeof(i)])
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