From: Benjamin Riefenstahl <b.riefenstahl@turtle-trading.net>
Cc: emacs-devel@gnu.org
Subject: Re: copying to clipboard silently discards lines
Date: Fri, 25 Feb 2005 18:24:46 +0100 [thread overview]
Message-ID: <m3r7j4wo0x.fsf@seneca.benny.turtle-trading.net> (raw)
In-Reply-To: <1156.220.255.172.231.1109344154.squirrel@www.stupidchicken.com> (Chong Yidong's message of "Fri, 25 Feb 2005 10:09:14 -0500 (EST)")
Hi Chong Yidong,
"Chong Yidong" writes:
> The bug is in the Lisp_Object QUNICODE, which specifies the
> "utf-16le-dos" coding system used by `selection-coding-system'.
QUINCODE is just a symbol, a unique string. It is used for looking up
the actual coding-system. setup_coding_system() in src/coding.c does
that lookup by filling in the struct coding_system.
> When a coding_system is extracted from QUNICODE, the parameter
> coding->spec.ccl.encoder.buf_magnification is 1. This causes a call to
> encoding_buffer_size (in convert_to_handle_as_coded, w32select.c:247) to
> return a buffer size that is too small for the encoded string.
>
> I'm guessing the magnification has to be set to 2, because `abc...'
> gets encoded to `a\0b\0c\0...' (encoding_buffer_size multiplies this
> again by 2, because of the CRLF issue.)
That would indicate that the coding-system "utf-16le-dos" itself has a
bug. The source code description comment for encoding_buffer_size()
says
Return maximum size (bytes) of a buffer enough for encoding SRC_BYTES
of text to CODING.
which matches its usage in w32select.c, I think.
> Trouble is, I can't find where the `spec.ccl...', or indeed any of
> the other parameters of QUNICODE are initialized.
Grep is our friend ;-). The coding-system (and its CCL programs) is
created in lisp/international/ccl.el using (define-ccl-program ...).
The parameter BUFFER_MAGNIFICATION for that function is set as 1 there
for the encoders (ccl-encode-mule-utf-16le, ccl-encode-mule-utf-16be,
ccl-encode-mule-utf-16le-with-signature,
ccl-encode-mule-utf-16be-with-signature), so that might well be the
problem.
Can you try and replace that 1 with 2 and see if your problem goes
away?
benny
next prev parent reply other threads:[~2005-02-25 17:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2150.220.255.172.231.1109220271.squirrel@220.255.172.231>
[not found] ` <1515.220.255.172.231.1109259901.squirrel@220.255.172.231>
2005-02-25 15:09 ` copying to clipboard silently discards lines Chong Yidong
2005-02-25 17:24 ` Benjamin Riefenstahl [this message]
2005-02-26 2:53 ` Chong Yidong
2005-02-28 7:20 ` Kenichi Handa
2005-02-28 19:13 ` Benjamin Riefenstahl
2005-03-08 9:10 ` Kenichi Handa
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