linux-kernel - Re: [PATCH] console UTF-8 fixes

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Date:	Thu, 12 Apr 2007 20:09:43 +0200 (CEST)
From:	Roman Zippel <zippel@...ux-m68k.org>
To:	Egmont Koblinger <egmont@...linux.hu>
cc:	"H. Peter Anvin" <hpa@...or.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] console UTF-8 fixes

Hi,

On Thu, 12 Apr 2007, Egmont Koblinger wrote:

> On Thu, Apr 12, 2007 at 05:52:49PM +0200, Roman Zippel wrote:
> 
> > Well, it often doesn't end there, other users may report these as bugs and 
> > want to get them fixed, so we have to look ahead a little for possible 
> > problems.
> 
> They may even report that the current behavior of not knowing anything about
> double-width characters is wrong. If Unicode is updated and someone reports
> the kernel code is outdated, it's going to be fairly easy to update that one
> as well.

As far as Unicode is concerned we could go really wild here, e.g. how do 
we handle decomposed characters, there are also halfwidth characters...
So the primary question is still: is this a kernel problem? The kernel 
only implements a simple fixed char width output device. Does it really 
make sense to pretend being able to handle characters, we can't display 
in first place?

> > It has everything to do with this. It describes the terminal capabilities, 
> > so why should variable width support not one part of it?
> 
> Nice idea. Terminfo database should tell whether a particular terminal
> supports double-width characters. Applications should expect the cursor to
> move one or two cells depending on this. So both terminfo databases as well
> as plenty of libraries and applications would need update.

If everyone reimplements this kind of stuff, something is seriously 
wrong...

bye, Roman
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