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* bug#32562: 26; `read-char(-exclusive)' and `characterp'
@ 2018-08-28 20:39 Drew Adams
  2018-08-28 20:51 ` Noam Postavsky
  2018-09-10  9:56 ` Eli Zaretskii
  0 siblings, 2 replies; 20+ messages in thread
From: Drew Adams @ 2018-08-28 20:39 UTC (permalink / raw)
  To: 32562

Perhaps there is no bug here, other than incomplete or insufficiently
clear doc.  Dunno.

emacs -Q
M-: (setq foo (read-char "Char: "))
M-:

shows: 134217786 (#o1000000072, #x800003a), a number too large
to be `characterp'.  And M-: (characterp foo) ; returns nil.

Same thing for `read-char-exclusive'.

Something seems wrong.  The doc for `read-char(-exclusive)' talks about
reading a character. For `read-char' it says that it raises an error for
a non-char event.  And for `read-char-exclusive' it says that it ignores
non-char events that it reads.

But they both seem to read the event from `M-:' and return its value
(a number). And it is not a character, according to `characterp'.

I'm confused.  Please consider fixing this, at least by clarifying the doc.

Why should a function that reads a character, and either ignores a
non-char or raises an error for a non-char, return a non-character?
And what function reads a `characterp' character, either ignoring
anything else or raising an error for anything else?

In GNU Emacs 26.1 (build 1, x86_64-w64-mingw32)
 of 2018-05-30
Repository revision: 07f8f9bc5a51f5aa94eb099f3e15fbe0c20ea1ea
Windowing system distributor `Microsoft Corp.', version 10.0.16299
Configured using:
 `configure --without-dbus --host=x86_64-w64-mingw32
 --without-compress-install 'CFLAGS=-O2 -static -g3''





^ permalink raw reply	[flat|nested] 20+ messages in thread
[parent not found: <<3cce8b54-2e85-49a2-84d8-386ded864148@default>]
[parent not found: <<<3cce8b54-2e85-49a2-84d8-386ded864148@default>]
[parent not found: <<<<3cce8b54-2e85-49a2-84d8-386ded864148@default>]

end of thread, other threads:[~2018-09-11 19:03 UTC | newest]

Thread overview: 20+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2018-08-28 20:39 bug#32562: 26; `read-char(-exclusive)' and `characterp' Drew Adams
2018-08-28 20:51 ` Noam Postavsky
2018-08-28 21:24   ` Drew Adams
2018-08-28 22:27     ` Noam Postavsky
2018-09-10 10:01     ` Eli Zaretskii
2018-09-10  9:56 ` Eli Zaretskii
     [not found] <<3cce8b54-2e85-49a2-84d8-386ded864148@default>
     [not found] ` <<83d0tlpteu.fsf@gnu.org>
2018-09-10 13:43   ` Drew Adams
2018-09-10 14:04     ` Eli Zaretskii
2018-09-10 14:29     ` Andreas Schwab
2018-09-10 15:01       ` Drew Adams
2018-09-10 17:22         ` Eli Zaretskii
     [not found] <<<3cce8b54-2e85-49a2-84d8-386ded864148@default>
     [not found] ` <<<83d0tlpteu.fsf@gnu.org>
     [not found]   ` <<5f51bd06-84dd-47f5-a7da-b0c5814a274c@default>
     [not found]     ` <<83r2i1o3dr.fsf@gnu.org>
2018-09-10 14:57       ` Drew Adams
     [not found]     ` <<mvmtvmxctnm.fsf@suse.de>
     [not found]       ` <<3d6fb22f-de5a-4cce-bf49-023f2fc8388f@default>
     [not found]         ` <<83k1ntnu6l.fsf@gnu.org>
2018-09-10 19:48           ` Drew Adams
2018-09-11  7:57             ` Eli Zaretskii
2018-09-11 15:30               ` Drew Adams
2018-09-11 17:07                 ` Eli Zaretskii
     [not found]   ` <<<5f51bd06-84dd-47f5-a7da-b0c5814a274c@default>
     [not found]     ` <<<mvmtvmxctnm.fsf@suse.de>
     [not found]       ` <<<3d6fb22f-de5a-4cce-bf49-023f2fc8388f@default>
     [not found]         ` <<<83k1ntnu6l.fsf@gnu.org>
     [not found]           ` <<4df2c3ce-9dcb-483c-b733-f91f54f33bce@default>
     [not found]             ` <<831sa0o49d.fsf@gnu.org>
     [not found]               ` <<4d4aa5cd-964c-41c5-ae72-24769afb0bd0@default>
     [not found]                 ` <<83in3cm08g.fsf@gnu.org>
2018-09-11 17:22                   ` Drew Adams
2018-09-11 18:34                     ` Eli Zaretskii
     [not found] <<<<3cce8b54-2e85-49a2-84d8-386ded864148@default>
     [not found] ` <<<<83d0tlpteu.fsf@gnu.org>
     [not found]   ` <<<<5f51bd06-84dd-47f5-a7da-b0c5814a274c@default>
     [not found]     ` <<<<mvmtvmxctnm.fsf@suse.de>
     [not found]       ` <<<<3d6fb22f-de5a-4cce-bf49-023f2fc8388f@default>
     [not found]         ` <<<<83k1ntnu6l.fsf@gnu.org>
     [not found]           ` <<<4df2c3ce-9dcb-483c-b733-f91f54f33bce@default>
     [not found]             ` <<<831sa0o49d.fsf@gnu.org>
     [not found]               ` <<<4d4aa5cd-964c-41c5-ae72-24769afb0bd0@default>
     [not found]                 ` <<<83in3cm08g.fsf@gnu.org>
     [not found]                   ` <<eedf9125-6ece-44cb-a01b-b8da3d707e8c@default>
     [not found]                     ` <<83ftyfnarp.fsf@gnu.org>
2018-09-11 18:58                       ` Drew Adams
2018-09-11 19:03                         ` Eli Zaretskii

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