Re: Usage of standard-display-table in MSDOS

["Ehud Karni" <ehud@unix.mvs.co.il>]

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On Wed, 01 Sep 2010 12:21:17 Kenichi Handa wrote:
>
> handa> Should we change the above code and all other codes setting
> handa> 0x80th..0xA0th elements of a display table?
>
> I've just committed the work to emacs-23 branch.  Ehud,
> could you try it?

OK. I downloaded and compiled the emacs-23 branch.

I only tested the characters displayed in different language
environment on X and text terminal.

There are 2 big problems - display on text terminal and use of the
display table with `find-file-literally'.

My testing shows that the display table works well on X (in the
3 language environment tested), but VERY poorly on text terminal.

I change the language environment with `set-locale-environment'.


Problem 1:
On text terminal the language environment has great influence on the
use of the display table - characters not it the language - are
always displayed as ? . So in the "C" locale, all characters > 127
are displayed as ?.
In the "he_IL" locale (= ISO-8859-8) characters in the range
191-223 and 251-255 are displayed as ?.
In the "en_GB" locale (= ISO-8859-1) the Hebrew characters (#x5D0-
#x5EA) are displayed as ?.

I really must use the "he_IL" because most of the file my users view
are in ISO-8859-8 and a small part have MSDOS Hebrew (#x80-#x9A), but
I want to see all the characters (#xB0-#xDF) literally (i.e. when a
byte in this range is displayed, its 8 bit value should be sent to
the terminal.


Problem 2:
When I use `find-file-literally' to visit a file, the display table is
mostly ignored, characters in #xA0-B2 are displayed in \OOO form, while
#xB3-DF are displayed as empty boxes (on X), whatever locale I use.
This is a change from the behavior of emacs-21.
Note: This can be controlled by `set-buffer-multibyte t', but then the
display is sometimes corrupted.

I attach a tar.bz2 file containing the following files:

1. test-heb.el - 2 functions: `display-hebrew' sets the display table.
                              `chars-list' - show characters #x20-#xFF.
2. motd - a file with many graphic characters.

3. 23-X-disp.png - display of #x20-#xFF on X (good, not dependent on
                   the locale)

4. 23-tty-C.png  - chars #x20-#xFF on text terminal with locale "C".
5. 23-tty-he.png - chars #x20-#xFF on text terminal with locale "he_IL".
6. 23-tty-en.png - chars #x20-#xFF on text terminal with locale "en_GB".

7. 21-motd-lit.png - `find-file-literally' of the motd on text terminal
                   in emacs 21.4 (good).
8. 23-X-motd.png - the motd on X - upper window: literally,
                                   lower window: regular find-file.

Ehud.


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