Re: Usage of standard-display-table in MSDOS

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 29 Aug 2010 13:16:02 +0300
> From: "Ehud Karni" <ehud@unix.mvs.co.il>
> Cc: eliz@gnu.org, emacs-devel@gnu.org
> Reply-to: ehud@unix.mvs.co.il
> 
> > ;; For NBSP (U+00A0)
> > (aset standard-display-table #xA0
> >       (vector (unibyte-char-to-multibyte #xA0)))
> 
> This does not work because `unibyte-char-to-multibyte' does not give
> the right result in Emacs-23.1 (it works well on Emacs-21.3).
> Sorry, I did not check on latest Emacs
> 
> I used the following to check it:
> 
> (defun check-multibyte-code (byte)
>        (message "Byte: %02X (%d),  Char: %04X (%d)"
>                 byte byte
>                 (unibyte-char-to-multibyte byte)
>                 (unibyte-char-to-multibyte byte)))
> 
> (check-multibyte-code #xE0)
> 
> 
> The result in 21.3 is correct:
>     Byte: E0 (224),  Char: 0C60 (3168)
> 
> But on 23.1 I get:
>     Byte: E0 (224),  Char: 3FFFE0 (4194272)
> i.e. "literal" #xE0.

The last result is correct 0x3FFFE0 is the internal representation of
0xE0 in Emacs 23.  Emacs 23 and later extends the Unicode code space
with these characters (and some others).

Why did you think it was incorrect?