From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Simon Josefsson <jas@extundo.com>
Cc: 1174@emacsbugs.donarmstrong.com,
Frank Schmitt <ich@frank-schmitt.net>,
ding@gnus.org
Subject: bug#1174: 23.0.60; Some UTF-8 mails displaying wrongly in Emacs 23
Date: Tue, 02 Dec 2008 02:36:31 -0500 [thread overview]
Message-ID: <jwv3ah7av77.fsf-monnier+emacsbugreports__28068.1886397817$1228204307$gmane$org@gnu.org> (raw)
In-Reply-To: <87y6yzbjgf.fsf@marauder.physik.uni-ulm.de> (Reiner Steib's message of "Mon, 01 Dec 2008 23:48:32 +0100")
> In Emacs 21 (which Gnus still aim to be compatible with), we have
> string-as-multibyte, but not string-to-multibyte. So your proposed
> code (i.e. mm-string-to-multibyte) runs
> (string-as-multibyte (char-to-string string))
> whereas we used to run
> (string-as-multibyte string)
> Does char-to-string matter here?
> (defalias 'mm-string-to-multibyte
> (cond
> ((featurep 'xemacs)
> 'identity)
> ((fboundp 'string-to-multibyte)
> 'string-to-multibyte)
> (t
> (lambda (string)
> "Return a multibyte string with the same individual chars as string."
> (mapconcat
> (lambda (ch) (mm-string-as-multibyte (char-to-string ch)))
> string "")))))
Oh, that's clever: yes, the mapconcat/char-to-string dance does make it
implement the string-to-multibyte behavior because doing the
string-as-multibyte conversion one byte at a time avoids the
problematic case. To quote myself from mm-util.el:
;; string-as-multibyte often doesn't really do what you think it does.
;; Example:
;; (aref (string-as-multibyte "\201") 0) -> 129 (aka ?\201)
;; (aref (string-as-multibyte "\300") 0) -> 192 (aka ?\300)
;; (aref (string-as-multibyte "\300\201") 0) -> 192 (aka ?\300)
;; (aref (string-as-multibyte "\300\201") 1) -> 129 (aka ?\201)
;; but
;; (aref (string-as-multibyte "\201\300") 0) -> 2240
;; (aref (string-as-multibyte "\201\300") 1) -> <error>
Basically when the sring passed is made of a single byte,
string-as-multibyte is equal to string-to-multibyte, which is the
property ued by the code you quoted above to build a poor man's
string-to-multibyte.
Stefan
next prev parent reply other threads:[~2008-12-02 7:36 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <jwviqpz1u4o.fsf-monnier+emacsbugreports@gnu.org>
2008-10-15 20:21 ` bug#1174: 23.0.60; Some UTF-8 mails displaying wrongly in Emacs 23 Frank Schmitt
2008-10-16 7:32 ` Andreas Schwab
2008-10-16 8:36 ` Frank Schmitt
2008-10-16 17:39 ` Eli Zaretskii
2008-10-16 18:00 ` Frank Schmitt
2008-10-16 18:15 ` Eli Zaretskii
2008-10-16 20:05 ` Frank Schmitt
2008-10-17 8:28 ` Andreas Schwab
2008-10-17 8:52 ` Frank Schmitt
2008-10-17 9:53 ` Eli Zaretskii
2008-10-17 10:02 ` Frank Schmitt
2008-10-17 10:08 ` Frank Schmitt
2008-10-17 15:39 ` Stefan Monnier
2008-10-17 18:19 ` Reiner Steib
[not found] ` <871vyf6q40.fsf@marauder.physik.uni-ulm.de>
2008-10-17 18:36 ` Frank Schmitt
[not found] ` <m3ej2fdq5x.fsf@mid.gehheimdienst.de>
2008-11-29 12:08 ` Reiner Steib
[not found] ` <87k5ampwej.fsf@marauder.physik.uni-ulm.de>
2008-11-29 12:18 ` Simon Josefsson
2008-12-01 21:04 ` Stefan Monnier
[not found] ` <jwv7i6j393g.fsf-monnier+emacsbugreports@gnu.org>
2008-12-01 22:48 ` Reiner Steib
[not found] ` <87y6yzbjgf.fsf@marauder.physik.uni-ulm.de>
2008-12-02 7:36 ` Stefan Monnier [this message]
[not found] ` <jwv3ah7av77.fsf-monnier+emacsbugreports@gnu.org>
2008-12-04 19:43 ` Reiner Steib
[not found] ` <87iqpz4tg2.fsf@marauder.physik.uni-ulm.de>
2008-12-04 21:43 ` Frank Schmitt
[not found] ` <878wr2ohde.fsf@mocca.josefsson.org>
2008-11-29 15:30 ` Reiner Steib
[not found] ` <87d4geim7p.fsf@marauder.physik.uni-ulm.de>
2008-11-29 21:30 ` Stefan Monnier
2008-11-29 22:14 ` James Cloos
[not found] ` <jwvfxlaz0ov.fsf-monnier+emacsbugreports@gnu.org>
2008-11-30 13:12 ` Reiner Steib
2009-01-12 10:54 ` Simon Josefsson
2009-01-12 11:03 ` Frank Schmitt
[not found] ` <m3d4es3hxu.fsf@mid.gehheimdienst.de>
2009-01-12 11:10 ` Simon Josefsson
[not found] ` <873afoixtr.fsf@mocca.josefsson.org>
[not found] ` <x6ab9u2kxr@gzp>
2009-01-14 20:12 ` Reiner Steib
[not found] ` <877i4xlk97.fsf@marauder.physik.uni-ulm.de>
2009-01-14 20:20 ` Processed: " Emacs bug Tracking System
2009-01-14 22:08 ` Stefan Monnier
2008-10-23 7:24 ` Frank Schmitt
2008-10-23 13:58 ` Stefan Monnier
2008-10-17 9:12 ` Frank Schmitt
2008-10-17 5:15 ` Richard M. Stallman
2008-10-28 22:54 ` James Cloos
2008-12-04 22:05 ` bug#1174: marked as done (23.0.60; Some UTF-8 mails displaying wrongly in Emacs 23) Emacs bug Tracking System
2009-02-18 8:55 ` Emacs bug Tracking System
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