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bug#26396: 25.1; char-displayable-p on a latin1 tty

From: Paul Eggert
Subject: bug#26396: 25.1; char-displayable-p on a latin1 tty
Date: Thu, 13 Apr 2017 13:58:45 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 04/13/2017 12:16 AM, Eli Zaretskii wrote:
Yes, that would be better.  But it's probably a non-trivial project,
since we'd need separate code to determine double-width glyphs,
padding glyphs, and perhaps also something special for composed
characters.  Does the Linux console allow us to figure out all of

This should not be a problem, as the Linux console has only single-width characters.

And what does "display as-is" means in practice?  Should we send to
the console the glyph codes corresponding to Unicode points, or should
we send UTF-8 encoded characters?

It depends on whether the console is in UTF-8 mode. If so, send UTF-8; if not, send a byte that is transformed according to the current mapping table into a Unicode value. I hope we don't need to bother with the latter possibility.

(Is there some document which
describes these features in enough detail for us to figure out their
implications on Emacs display code?)

Nothing definitive, but there is:


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