linux-kernel - Re: [2.6 patch] UTF-8 fixes in comments

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Date:	Tue, 29 Apr 2008 14:27:18 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Willy Tarreau <w@....eu>
Cc:	Helge Hafting <helge.hafting@...el.hist.no>,
	"H. Peter Anvin" <hpa@...nel.org>, linux-kernel@...r.kernel.org,
	trivial@...nel.org
Subject: Re: [2.6 patch] UTF-8 fixes in comments

On Tue, Apr 29, 2008 at 01:06:38PM +0200, Willy Tarreau wrote:
> On Tue, Apr 29, 2008 at 01:42:16PM +0300, Adrian Bunk wrote:
> > On Tue, Apr 29, 2008 at 12:09:34PM +0200, Willy Tarreau wrote:
>...
> > > Unicode yes, UTF-8 no. UTF-8 is a compressed encoding of unicode.
> > > That's as silly as if you had to replace your terminals to read
> > > native gzip, and expect them as well as all the tools to work
> > > properly!
> > 
> > It's not a compressed encoding, it's a variable-length encoding.
> > 
> > Besides the size advantages one main advantage of UTF-8 is that ASCII is 
> > valid UTF-8. This means that for the ASCII source code in the kernel it 
> > doesn't matter whether it's treated as ASCII or UTF-8, and no conversion 
> > was needed.
> > 
> > You can't get this property with a fixed-size Unicode encoding.
> 
> I don't agree. If you refuse character-set mixing, there's no problem.
> Bit 7 of first char == 1 ? => full text is 32 bit.

You miss my point.

The point is:
A conversion "ASCII -> UTF-8" is a nop.

This means when changing the kernel from half a dozen charsets used in 
comments to UTF-8 we only had to change the few characters actually 
containing non UTF-8.

Going to something like UTF-32 as you suggest would have involved 
converting every single file in the kernel.

> Willy

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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