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From: Alan Mackenzie <acm@muc.de>
To: Eli Zaretskii <eliz@gnu.org>
Cc: gregory@heytings.org, rms@gnu.org, emacs-devel@gnu.org
Subject: Re: Display of undisplayable characters: \U01F3A8 instead of diamond
Date: Fri, 2 Sep 2022 13:39:51 +0000	[thread overview]
Message-ID: <YxIHp5P8sBRjz/Vg@ACM> (raw)
In-Reply-To: <83mtbiovzr.fsf@gnu.org>

Hello, Eli.

On Fri, Sep 02, 2022 at 14:29:12 +0300, Eli Zaretskii wrote:
> > Date: Fri, 2 Sep 2022 11:12:32 +0000
> > Cc: Richard Stallman <rms@gnu.org>, eliz@gnu.org, emacs-devel@gnu.org
> > From: Alan Mackenzie <acm@muc.de>

[ .... ]

> > I agree with Richard that there should be an option for displaying
> > characters outside of the current font as "�" rather than "\u2022".

> I already explained how to set that up, so what exactly does the
> "should be" part here want to say?

The way you explained involves hacking Lisp and finding out precise
character ranges.  That's a lot different from being able just to set an
option.

> There is already such a way in Emacs.  Just use it, if that's what you
> want.

There appears to be no easy way to get the old behaviour back, where
characters undisplayable on the console got displayed with \ufffd
instead.  You've characterised this old behaviour as a bug, but in the
preferences of two actual Linux console users (Richard and myself), the
solution is not better than the bug.

> > It is a feature of the Linux console that all such characters are
> > displayed that way.

> That feature provides no way of using it via standard terminfo
> interfaces.  Heck, even the way to ask the console which characters it
> supports is a kludge specific to that console!

Yes, I remember looking into that to try to find a way.  Somebody
brighter than me clearly managed it.  :-)

> > There is no possibility of any character causing an undefined
> > action.

> Famous last words.  (And we don't send characters to the console, we
> send bytes.)

OK, bytes.  Have there been any untoward effects reported, by sending
valid Unicode strings of bytes to the Linux console?

-- 
Alan Mackenzie (Nuremberg, Germany).



  reply	other threads:[~2022-09-02 13:39 UTC|newest]

Thread overview: 274+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-26  3:33 Display of undisplayable characters: \U01F3A8 instead of diamond Richard Stallman
2022-08-26  5:21 ` Emanuel Berg
2022-08-26  6:45 ` Eli Zaretskii
2022-08-26  8:23   ` Emanuel Berg
2022-08-26  8:45     ` Emanuel Berg
2022-08-26  9:05     ` Yuri Khan
2022-08-26  9:11       ` Emanuel Berg
2022-08-26  9:28         ` Yuri Khan
2022-08-26  9:40           ` Emanuel Berg
2022-08-26  9:47             ` Emanuel Berg
2022-08-26  9:50               ` Yuri Khan
2022-08-26  9:54                 ` Emanuel Berg
2022-08-26  9:50             ` Emanuel Berg
2022-08-28  4:04   ` Richard Stallman
2022-08-28  6:10     ` Eli Zaretskii
2022-08-28  6:51       ` Emanuel Berg
2022-08-28  7:04         ` Emanuel Berg
2022-08-28  7:09           ` Emanuel Berg
2022-08-28  7:10           ` Eli Zaretskii
2022-08-28  7:21             ` Emanuel Berg
2022-08-26  6:52 ` Kévin Le Gouguec
2022-08-26  7:15   ` Eli Zaretskii
2022-08-26  8:37     ` Emanuel Berg
2022-08-26  8:52       ` Emanuel Berg
2022-08-26  9:24         ` Emanuel Berg
2022-08-26  9:25         ` Andreas Schwab
2022-08-26  9:32           ` Emanuel Berg
2022-08-26 17:41     ` Kévin Le Gouguec
2022-08-26 19:34       ` Emanuel Berg
2022-08-28  4:04     ` Richard Stallman
2022-08-28  5:32       ` Emanuel Berg
2022-08-26  9:58 ` Gregory Heytings
2022-08-26 10:11   ` Emanuel Berg
2022-08-26 10:59     ` Gregory Heytings
2022-08-26 11:31       ` Emanuel Berg
2022-08-26 12:15         ` Gregory Heytings
2022-08-26 12:56   ` Alan Mackenzie
2022-08-26 13:29     ` Gregory Heytings
2022-08-28 10:35       ` Alan Mackenzie
2022-08-28 10:41         ` Eli Zaretskii
2022-08-28 13:00           ` Gregory Heytings
2022-08-28 14:18             ` Eli Zaretskii
2022-08-28 14:44               ` Gregory Heytings
2022-08-28 15:05                 ` Eli Zaretskii
2022-08-28 15:18                   ` Gregory Heytings
2022-08-28 15:34                     ` Eli Zaretskii
2022-08-28 15:53                       ` Gregory Heytings
2022-08-28 16:00                         ` Eli Zaretskii
2022-08-28 16:07                           ` Gregory Heytings
2022-08-28 16:09                             ` Eli Zaretskii
2022-08-28 20:07                 ` Gregory Heytings
2022-08-29 11:03                   ` Eli Zaretskii
2022-08-29 18:48                     ` Gregory Heytings
2022-08-28 15:39               ` Alan Mackenzie
2022-08-28 15:43                 ` Eli Zaretskii
2022-08-28 15:35             ` Alan Mackenzie
2022-08-28 15:37               ` Eli Zaretskii
2022-08-28 15:46               ` Gregory Heytings
2022-08-28 16:14                 ` Alan Mackenzie
2022-08-28 16:53                   ` Gregory Heytings
2022-08-28 18:27                 ` Stefan Monnier
2022-08-28 18:44                   ` Stefan Monnier
2022-08-28 18:45                   ` Alan Mackenzie
2022-08-28 20:09                     ` Gregory Heytings
2022-08-28 20:37                       ` Alan Mackenzie
2022-08-28 20:09             ` Emanuel Berg
2022-08-28 14:25           ` Alan Mackenzie
2022-08-28 14:59             ` Gregory Heytings
2022-08-28 20:05           ` Emanuel Berg
2022-08-29 10:58             ` Eli Zaretskii
2022-08-29 11:26               ` Yuri Khan
2022-08-29 11:37                 ` Eli Zaretskii
2022-08-29 12:21                   ` Alan Mackenzie
2022-08-28 12:40         ` Gregory Heytings
2022-08-26 21:45 ` Alan Mackenzie
2022-08-26 22:56   ` Emanuel Berg
2022-08-27  7:12     ` Eli Zaretskii
2022-08-27  7:22       ` Visuwesh
2022-08-27  9:11         ` Eli Zaretskii
2022-08-27 10:43           ` Visuwesh
2022-08-28  4:04   ` Richard Stallman
2022-08-28  5:22     ` Eli Zaretskii
2022-08-28 10:07       ` Alan Mackenzie
2022-08-28 10:29         ` Eli Zaretskii
2022-08-28 11:07           ` Alan Mackenzie
2022-08-28 11:44             ` Eli Zaretskii
2022-08-28 13:56               ` Alan Mackenzie
2022-08-27  5:44 ` Akib Azmain Turja
2022-08-27  7:29   ` Andreas Schwab
2022-08-27  9:13     ` Eli Zaretskii
2022-08-27 17:24       ` Emanuel Berg
2022-08-27 17:41         ` Eli Zaretskii
2022-08-27 21:50           ` Emanuel Berg
2022-08-28  2:15             ` Emanuel Berg
2022-08-28  5:45             ` Eli Zaretskii
2022-08-28  6:02               ` Emanuel Berg
2022-08-27 17:22   ` Emanuel Berg
2022-08-29  3:36   ` Richard Stallman
2022-08-29 13:00     ` Eli Zaretskii
2022-08-30  4:12       ` Richard Stallman
2022-08-30 11:41         ` Eli Zaretskii
2022-08-30 12:15           ` Eli Zaretskii
2022-08-30 15:44         ` Gregory Heytings
2022-08-31  0:34           ` Emanuel Berg
2022-08-31  2:35             ` Eli Zaretskii
2022-08-31  3:00               ` Emanuel Berg
2022-08-31 11:00                 ` Eli Zaretskii
2022-09-01 23:32           ` Richard Stallman
2022-09-01 23:39             ` Emanuel Berg
2022-09-01 23:49               ` Emanuel Berg
2022-09-02  6:37             ` Eli Zaretskii
2022-09-02 12:21               ` Akib Azmain Turja
2022-09-02 12:36                 ` Eli Zaretskii
2022-09-02 12:39                 ` Gregory Heytings
2022-09-03  2:51                 ` Richard Stallman
2022-09-03  3:04                   ` Emanuel Berg
2022-09-03  6:35                   ` Akib Azmain Turja
2022-09-03  6:54                   ` Gregory Heytings
2022-09-03  8:13                     ` Emanuel Berg
2022-09-03  8:55                       ` Gregory Heytings
2022-09-03  9:04                         ` Emanuel Berg
2022-09-03  9:34                           ` Eli Zaretskii
2022-09-03  9:42                             ` Emanuel Berg
2022-09-03  9:55                               ` Eli Zaretskii
2022-09-03 12:48                                 ` Akib Azmain Turja
2022-09-08  2:56                             ` Richard Stallman
2022-09-08  7:16                               ` Eli Zaretskii
2022-09-08  9:14                               ` Gregory Heytings
2022-09-09  3:03                                 ` Richard Stallman
2022-09-09  7:30                                   ` Gregory Heytings
2022-09-09  8:10                                     ` Po Lu
2022-09-09 10:08                                       ` Emanuel Berg
2022-09-09 10:13                                         ` Gregory Heytings
2022-09-09 10:25                                           ` Emanuel Berg
2022-09-09 11:11                                             ` Eli Zaretskii
2022-09-09 11:04                                         ` Eli Zaretskii
2022-09-09 10:13                                       ` Emanuel Berg
2022-09-09 11:10                                         ` Eli Zaretskii
2022-09-09 10:52                                       ` Eli Zaretskii
2022-09-10  1:42                                         ` Emanuel Berg
2022-09-09 11:18                                       ` Gregory Heytings
2022-09-09 13:47                                         ` Po Lu
2022-09-09 14:08                                           ` Gregory Heytings
2022-09-10 15:09                                             ` Emanuel Berg
2022-09-09 14:15                                           ` Eli Zaretskii
2022-09-10 15:01                                           ` Emanuel Berg
2022-09-10 14:56                                         ` Emanuel Berg
2022-09-09 10:09                                     ` Emanuel Berg
2022-09-03  9:17                     ` Yuri Khan
2022-09-03  9:28                       ` Gregory Heytings
2022-09-03  9:36                         ` Emanuel Berg
2022-09-03  9:31                       ` Emanuel Berg
2022-09-03  9:40                         ` Yuri Khan
2022-09-03  9:47                           ` Emanuel Berg
2022-09-03 10:00                             ` Emanuel Berg
2022-09-03 12:47                               ` Akib Azmain Turja
2022-09-05  2:47                                 ` Emanuel Berg
2022-09-05  6:08                                   ` enum (was: Re: Display of undisplayable characters: \U01F3A8 instead of diamond) Emanuel Berg
2022-09-08  4:50                                     ` enum Emanuel Berg
2022-09-05  4:05                     ` Display of undisplayable characters: \U01F3A8 instead of diamond Richard Stallman
2022-09-05  4:51                       ` Emanuel Berg
2022-09-03  2:51               ` Richard Stallman
2022-09-02  7:28             ` Gregory Heytings
2022-09-02 11:12               ` Alan Mackenzie
2022-09-02 11:29                 ` Eli Zaretskii
2022-09-02 13:39                   ` Alan Mackenzie [this message]
2022-09-02 13:44                     ` Gregory Heytings
2022-09-02 13:59                     ` Eli Zaretskii
2022-09-02 14:39                       ` chad
2022-09-02 14:42                         ` Gregory Heytings
2022-09-02 18:49                         ` Emanuel Berg
2022-09-02 19:41                           ` Gregory Heytings
2022-09-02 21:13                             ` Emanuel Berg
2022-09-02 20:39                           ` chad
2022-09-02 21:14                             ` Emanuel Berg
2022-09-02 21:52                             ` Alan Mackenzie
2022-09-03  0:33                               ` Gregory Heytings
2022-09-03  1:41                                 ` Emanuel Berg
2022-09-02 16:12                       ` Alan Mackenzie
2022-09-02 16:26                         ` Eli Zaretskii
2022-09-03  5:27                           ` Tomas Hlavaty
2022-09-03  8:15                             ` Emanuel Berg
2022-09-03  8:29                               ` Emanuel Berg
2022-09-05  4:05                                 ` Richard Stallman
2022-09-04 13:23                           ` Andreas Schwab
2022-09-02 19:19                         ` Gregory Heytings
2022-09-03  2:51                       ` Richard Stallman
2022-09-03  6:44                         ` Eli Zaretskii
2022-09-04 11:23                           ` Alan Mackenzie
2022-09-04 13:01                             ` Eli Zaretskii
2022-09-05 18:59                               ` Alan Mackenzie
2022-09-06  4:15                                 ` Richard Stallman
2022-09-05  4:01                             ` Richard Stallman
2022-09-05  4:05                           ` Richard Stallman
2022-09-05  4:55                             ` Emanuel Berg
2022-09-05 11:33                             ` Eli Zaretskii
2022-09-06  4:20                               ` Emanuel Berg
2022-09-06 10:01                                 ` Eli Zaretskii
2022-09-06 10:38                                   ` Emanuel Berg
2022-09-06 13:03                                     ` Eli Zaretskii
2022-09-07  1:03                                       ` Emanuel Berg
2022-09-07  2:37                                         ` Eli Zaretskii
2022-09-07  3:21                                           ` Emanuel Berg
2022-09-07 11:02                                             ` Eli Zaretskii
2022-09-07 13:12                                               ` Yuri Khan
2022-09-07 13:34                                                 ` Eli Zaretskii
2022-09-07 13:58                                                   ` Yuri Khan
2022-09-07 14:20                                                     ` Eli Zaretskii
2022-09-07 15:48                                                       ` Tomas Hlavaty
2022-09-07 16:48                                                         ` Stefan Monnier
2022-09-07 17:02                                                           ` Tomas Hlavaty
2022-09-08 12:26                                                           ` Emanuel Berg
2022-09-07 18:03                                                         ` Eli Zaretskii
2022-09-08 12:28                                                           ` Emanuel Berg
2022-09-08 12:24                                                         ` Emanuel Berg
2022-09-07 17:29                                                       ` Yuri Khan
2022-09-07 18:32                                                         ` Eli Zaretskii
2022-09-09  9:56                                                           ` Emanuel Berg
2022-09-09 11:01                                                             ` Eli Zaretskii
2022-09-10  4:41                                                               ` Emanuel Berg
2022-09-10  6:33                                                                 ` Eli Zaretskii
2022-09-10 15:19                                                                   ` Emanuel Berg
2022-09-10 15:40                                                                     ` Eli Zaretskii
2022-09-10 15:55                                                                       ` Emanuel Berg
2022-09-10 17:18                                                                         ` Emanuel Berg
2022-09-20  1:09                                                                           ` Emanuel Berg
2022-09-08 12:29                                                         ` Emanuel Berg
2022-09-08 12:14                                                       ` Emanuel Berg
2022-09-08  2:12                                                     ` Emanuel Berg
2022-09-08  1:32                                                 ` Emanuel Berg
2022-09-08  6:17                                                   ` Eli Zaretskii
2022-09-09  9:59                                                     ` Emanuel Berg
2022-09-09 11:02                                                       ` Eli Zaretskii
2022-09-10  6:49                                                       ` Richard Stallman
2022-09-07  2:19                               ` Richard Stallman
2022-09-07 13:21                                 ` Eli Zaretskii
2022-09-03  2:51                     ` Richard Stallman
2022-09-03  3:09                       ` Emanuel Berg
2022-09-03  6:36                       ` Eli Zaretskii
2022-09-06  4:13                         ` Richard Stallman
2022-09-06  4:18                           ` Emanuel Berg
2022-09-08  2:56                             ` Richard Stallman
2022-09-02 11:39                 ` Gregory Heytings
2022-09-02 12:30                   ` Eli Zaretskii
2022-09-02 12:44                     ` Gregory Heytings
2022-09-02 13:14                       ` Eli Zaretskii
2022-09-02 14:15                         ` Gregory Heytings
2022-09-02 15:20                           ` Eli Zaretskii
2022-09-02 15:27                             ` Gregory Heytings
2022-09-02 15:34                               ` Gregory Heytings
2022-09-02 15:45                                 ` Gregory Heytings
2022-09-02 16:06                                   ` Eli Zaretskii
2022-09-02 16:30                                     ` Eli Zaretskii
2022-09-02 16:37                                     ` Gregory Heytings
2022-09-02 16:55                                       ` Andreas Schwab
2022-09-02 16:56                                         ` Gregory Heytings
2022-09-02 18:19                                           ` Eli Zaretskii
2022-09-02 18:24                                             ` Eli Zaretskii
2022-09-02 19:13                                               ` Gregory Heytings
2022-09-02 16:03                                 ` Eli Zaretskii
2022-09-02 16:02                               ` Eli Zaretskii
2022-09-02 13:13                   ` Alan Mackenzie
2022-09-02 13:41                     ` Gregory Heytings
2022-09-02 15:38                       ` Alan Mackenzie
2022-09-02 16:00                         ` Gregory Heytings
2022-09-02 16:32                           ` Stefan Monnier
2022-09-02 16:55                         ` Yuri Khan
2022-09-03  5:35                         ` Tomas Hlavaty
2022-09-03  5:49                           ` Jean Louis
2022-09-03  9:16                             ` Emanuel Berg
2022-09-03  6:46                           ` Gregory Heytings
2022-09-02 11:47     ` Akib Azmain Turja
2022-09-02 12:07       ` Gregory Heytings
2022-09-02 12:45       ` Eli Zaretskii

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