bug#292: 23.0.60; High Unicode codepoint triggers "arithmetic error"

bug#292: 23.0.60; High Unicode codepoint triggers "arithmetic error"

[Torsten Bronger]

When I create a file with just one line and one character 0x23de in UTF-8
encoding (i.e., file contents is u"\u23de\n" in Python notation), and I open
this file in Emacs, the buffer is not displayed.  Instead, I still see the
*scratch* buffer which was opened before.  When moving point in this
(invisible) buffer, I get the following error message: "line-move-1: Arithmetic
error"


In GNU Emacs 23.0.60.3 (x86_64-unknown-linux-gnu)
 of 2008-05-22 on wilson
Windowing system distributor `The X.Org Foundation', version 11.0.10400090
configured using `configure  '--prefix=/usr/local/' '--mandir=/usr/local/share/man/' '--infodir=/usr/local/share/info/' '--with-x-toolkit=no' '--with-xpm' '--with-jpeg' '--with-tiff' '--with-gif' '--with-png' '--with-x''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: de_DE.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  global-auto-revert-mode: t
  savehist-mode: t
  display-time-mode: t
  desktop-save-mode: t
  mouse-wheel-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t

bug#292: 23.0.60; High Unicode codepoint triggers "arithmetic error"

[Chong Yidong]

> When I create a file with just one line and one character 0x23de in
> UTF-8 encoding (i.e., file contents is u"\u23de\n" in Python
> notation), and I open this file in Emacs, the buffer is not displayed.
> Instead, I still see the *scratch* buffer which was opened before.
> When moving point in this (invisible) buffer, I get the following
> error message: "line-move-1: Arithmetic error"

Do you still still see this error with the latest version of Emacs from
CVS?

bug#292: 23.0.60; High Unicode codepoint triggers "arithmetic error"

[Torsten Bronger]

Hallöchen!

Chong Yidong writes:

>> When I create a file with just one line and one character 0x23de
>> in UTF-8 encoding (i.e., file contents is u"\u23de\n" in Python
>> notation), and I open this file in Emacs, the buffer is not
>> displayed.  Instead, I still see the *scratch* buffer which was
>> opened before.  When moving point in this (invisible) buffer, I
>> get the following error message: "line-move-1: Arithmetic error"
>
> Do you still still see this error with the latest version of Emacs
> from CVS?

I still experience a short freeze when the position with the high
Unicode codepoint is visited for the first time while scrolling
through the file.  (Maybe fonts are loaded into memory?)  But the
reported bug is gone.

Tschö,
Torsten.

-- 
Torsten Bronger, aquisgrana, europa vetus
                   Jabber ID: torsten.bronger@jabber.rwth-aachen.de