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

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Message-ID: <20070412092200.GB15666@uhulinux.hu>
Date:	Thu, 12 Apr 2007 11:22:00 +0200
From:	Egmont Koblinger <egmont@...linux.hu>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] console UTF-8 fixes

On Wed, Apr 11, 2007 at 09:00:49PM +0200, Jan Engelhardt wrote:

> >+struct interval {
> >+  int first;
> >+  int last;
> >+};
> 
> CodingStyle? uint16_t instead of int?

> >+    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
> >+    { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F }, { 0xE0100, 0xE01EF }
> >+  };
> 
> Since Unicode above 0xFFFF is unsupported, could not these entries be killed?

The UTF-8 decoder part already supports full 31-bit Unicode (including 5 and
6 byte long UTF-8 sequences). It's only the font handling part that doesn't
support Unicode beyond BMP. If an application prints a non-BMP character
that is double-wide, or is a zero-width space, the expected behavior is to
move the cursor by two or zero positions. In order to do this, width
information is needed even beyond BMP.  It's a completely different story
that there would be no real glyph displayed, just e.g. a replacement symbol
followed by a space to pretend a real double-width character was printed.

> unsigned int rescan:1;
> unsigned int inverse:1;
> unsigned int width; or even uint8_t.
> I would not mind unsigned.

Okay.

-- 
Egmont
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