linux-kernel - Re: String conversions

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Message-ID: <49F84B38.7080308@suse.de>
Date:	Wed, 29 Apr 2009 18:12:32 +0530
From:	Suresh Jayaraman <sjayaraman@...e.de>
To:	Steve French <smfrench@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: String conversions

> Steve French <smfrench@...il.com> wrote:
> 
> In looking at various patches for more accurately sizing the required
> buffer needed for conversions to UTF-8, the following question came up
> more than once.
> 
> Functions which do string copying often null terminate the target
> string (single byte of \0), and size strings one byte larger than
> their string name (for UCS-2 this does not work since the null
> termination is two bytes). � Are there local nls codepages in Linux
> kernel which require double null termination (e.g. DBCS asian code
> pages), and if so how do you tell which ones require "double null
> termination?"

A look at fs/nls and supported charsets suggests that the linux kernel
does not support a pure double-byte charsets. Some of the supported east
asian charsets seem to be a superset of ASCII (for e.g TIS 620, Big5)
and only non-ASCII characters are expressed in 2 bytes.


Thanks,

-- 
Suresh Jayaraman
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