Re: "Outer world" encoding for non-Latin1 language environments

[Anton Zinoviev <anton@lml.bas.bg>]

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On  7.III.2002 at 08:02 Eli Zaretskii wrote:
> 
> On Wed, 6 Mar 2002, Anton Zinoviev wrote:
> 
> > I wanted to say that there are no problems in Linux console.  The
> > problems are only in X Window.  This makes me think that the problem is
> > not because of the locale-coding-system (I am not able to check this
> > right now).
> 
> Actually, this points into the direction I was thinking of: on a text 
> terminal locale-coding-system is not used to decode keyboard input, while 
> on X it is.

(Sorry for the delayed reply.)

I investigated what happened.

Emacs tries to get a code for the received xkeysym.  It gets this code
acording to encoding of the locale Emacs is started with.  If this
encoding includes the key-pressed symbol the result is an Emacs-event of
the form [194], where 194 is the code of the key-pressed symbol.  If
this symbol is not included in the encoding of the locale, then the
result is a symbol of the form [S-Cyrillic-A].  Emacs can't interpret
such sort of events (they are not bound to any action) and that's why I
got beeps -- I started Emacs under LANG=C and thus Cyrillic symbols were
not includes of the locale encoding (i.e. ASCII).  This is not a real
bug, but only a wishlist.

However Emacs beeps also for xkeysyms like ISO_Next_Group, thou it must
interpret them the same way as Mode_switch.  This is a bug, I've
attached the fix.

Copying from a KOI8-R of ISO-8859-5 xterm and pasting in Emacs works
fine -- the result are symbols from ISO-8859-5.  Copying from an Unicode
xterm gives Japanese double-width Cyrillic symbols.  The output of C-u
C-x = is attached.

Regards, Anton Zinoviev


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diff -Naur emacs.old/src/xterm.c emacs.new/src/xterm.c
--- emacs.old/src/xterm.c	Sat Mar  2 00:38:47 2002
+++ emacs.new/src/xterm.c	Sun Mar 10 23:05:22 2002
@@ -1,5 +1,5 @@
 /* X Communication module for terminals which understand the X protocol.
-   Copyright (C) 1989, 93, 94, 95, 96, 1997, 1998, 1999, 2000, 2001
+   Copyright (C) 1989, 93, 94, 95, 96, 1997, 1998, 1999, 2000, 2001, 2002
    Free Software Foundation, Inc.
 
 This file is part of GNU Emacs.
@@ -10629,6 +10629,14 @@
 				|| ((unsigned)(orig_keysym) == XK_Num_Lock)
 #endif
 #endif /* not HAVE_X11R5 */
+				/* The symbols from XK_ISO_Lock to
+				   XK_ISO_Last_Group_Lock doesn't have real
+				   modifiers but should be treated similarly
+				   to Mode_switch by Emacs. */
+#if defined XK_ISO_Lock && defined XK_ISO_Last_Group_Lock
+				|| ((unsigned)(orig_keysym) >=  XK_ISO_Lock
+				    && (unsigned)(orig_keysym) <= XK_ISO_Last_Group_Lock)
+#endif
 				))
 			{
 			  if (temp_index == sizeof temp_buffer / sizeof (short))

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  character: ^[$B'U^[(B (0151725, 54229, 0xd3d5)
    charset: japanese-jisx0208 (JISX0208.1983/1990 Japanese Kanji: ISO-IR-87.)
 code point: 39 85
     syntax: word
   category: Y:Cyrillic characters of 2-byte character sets   j:Japanese  
	     |:While filling, we can break a line at this character.  
buffer code: 0x92 0xA7 0xD5
  file code: ESC 24 42 27 55 (encoded by coding system iso-2022-7bit)
       font: -Misc-Fixed-Medium-R-Normal--14-130-75-75-C-140-JISX0208.1983-0


adsf ^[$B'Q'c'U'f^[(B