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Re: Problems with 32-bit Unicode codepoints

From: Vladimir Marek
Subject: Re: Problems with 32-bit Unicode codepoints
Date: Thu, 22 May 2008 12:29:51 +0200
User-agent: Mutt/1.5.18 (2008-05-19)

> > > It appears screen does not cope with 32-bit Unicode codepoints
> > > (actually anything more than FFFF). I can view them in urxvt
> > > without screen, but not in a screen session. My environment is
> > > fully UTF-8.
> > 
> > By quick inspection, it seems that function
> > 
> > FromUtf8(c, utf8charp)
> > 
> > returns
> > 
> >   if (c & 0xffff0000)
> >     c = UCS_REPL;       /* sorry, only know 16bit Unicode */
> > 
> > I'm just looking into the Unicode Standard. It might not be too
> > difficult to add 3rd and 4th byte.
> > 
> > I'll see what I can do.

Hmm, I have been too optimistic. It seems that the UTF-8 decoding bit
works correctly. But there is no internal storage for more than two

Local gurus, please correct me if I'm wrong.

mchar->image holds the lowermost 8bytes
mchar->font holds one-but-lowermost 8bytes (unless it's 1, which means
that character is not utf-8)

My next naive theory is that if we make mchar->font 4 bytes wide (int),
and we enhance MPutChar & LPutChar, we might get more UTF-8 support.

Am I at least a bit close to the reality ?



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