Re: Usage of standard-display-table in MSDOS

[Ehud Karni]

On Sun, 29 Aug 2010 07:21:26 Eli Zaretskii wrote:
>
> > From: "Ehud Karni" <address@hidden>
> >
> > > ;; 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).
> >
> > 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?

Because of my coding system (iso-8859, remember ?) the #xE0 should be
displayed as Aleph, not some 8 bit byte E0.

Instead of trying to understand my problem, you are telling me why
Emacs behaves in this way (which is of no use for Handa san suggestion:
a way to set the display table). If you think this is the way it should
be, give the reason, not the technical details.


Ehud.


--
 Ehud Karni           Tel: +972-3-7966-561  /"\
 Mivtach - Simon      Fax: +972-3-7976-561  \ /  ASCII Ribbon Campaign
 Insurance agencies   (USA) voice mail and   X   Against   HTML   Mail
 http://www.mvs.co.il  FAX:  1-815-5509341  / \
 GnuPG: 98EA398D <http://www.keyserver.net/>    Better Safe Than Sorry