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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20120821220613.GK23464@ZenIV.linux.org.uk>
Date:	Tue, 21 Aug 2012 23:06:13 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Jim Rees <rees@...ch.edu>
Cc:	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] strings: helper for maximum decimal encoding of an
 unsigned integer

On Tue, Aug 21, 2012 at 05:22:27PM -0400, Jim Rees wrote:
> J. Bruce Fields wrote:
> 
>   From: "J. Bruce Fields" <bfields@...hat.com>
>   
>   I've seen a couple examples recently where we've gotten this wrong.
>   Maybe something like this would help?  Is there some better way?
>   
>   (Approximation due to Jim Rees).
> 
> Please add Suggested-by: Jim Rees <rees@...ch.edu>.  I'm thinking of
> patenting the algorithm.

Is that a joke?  Patenting the fact that log10(256) is 2.408..., which
is about 2.4, which is 24/10?  I really hope we are Poe'd...  BTW, NAK
the comment - s/36/26/ in there; check it yourself -
$ echo '2^(8*27)' | bc
105312291668557186697918027683670432318895095400549111254310977536
which is 66-digit, not 65 as the estimate would be.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/