bug#1726: 23.0.60; end-of-sentence and non-breaking space

[Kenichi Handa <handa@m17n.org>]

In article <utz8gmj9t.fsf@gnu.org>, Eli Zaretskii <eliz@gnu.org> writes:

> > From: Richard M Stallman <rms@gnu.org>
> > Date: Sat, 03 Jan 2009 10:21:58 -0500
> > Cc: cyd@stupidchicken.com, 1726@emacsbugs.donarmstrong.com, emacs-devel@gnu.org
> > 
> >     IIUC if you want the character with code #xa0, then using \u00a0 would
> >     seem like the most unambiguous option (I notice that "\ua0" gives
> >     a weird error "Non-hex digit used for Unicode escape").
> > 
> > I expected \xa0 to give me that character.  It still seems strange
> > that it would do anything else.

> We need some way of inserting raw 8-bit bytes, because otherwise code
> that encodes and decodes text in Lisp will not work.  For inserting
> characters, we have the \u alternative; but I don't think there's
> alternative for raw bytes except insert \xNN.

I modified read_escape to treat "\xXX" as a raw-byte code
but treat "\xXXX.." as a character code U+XXX...  As far as
I remember, this is to keep backward compatibility.

And, we have the alternative for raw bytes.  That is to use
octal form, something like "\240".

---
Kenichi Handa
handa@m17n.org