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Re: Emacs puts binary junk into the clipboard, marking it as text

From: Kevin Rodgers
Subject: Re: Emacs puts binary junk into the clipboard, marking it as text
Date: Fri, 15 Sep 2006 10:30:41 -0600
User-agent: Thunderbird (Windows/20060719)

Jan Djärv wrote:

Chris Moore skrev:
Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

I run the Xfce 4 desktop environment, along with the
xfce4-clipman-plugin applet which collects clipboard entries and
allows me to chose between them from a menu.

I have x-select-enable-clipboard set to t in Emacs, so whenever I
'kill' regions of the buffer, they get sent to the clipboard.

Occasionally the clipman applet will start consuming all available
CPU.  This happens when I copy certain binary characters.  Seems the
clipman gets stuck in a loop trying to convert illegal an illegal UTF8

A very simple case which reproduces the bug:

I made a 1-byte file containing just character 0300 (octal),
copied that using Emacs, and clipman started printing its error
message over and over again.

I reported this bug firstly to the Xfce BTS:


but they told me it was a gtk bug, so I raised the same bug in the
GNOME tracker:


and they tell me it's an Emacs bug, saying:

Well, if emacs puts binary junk into a text property it is not gtk's
Look at gtk_selection_data_get_text(): We only try to convert
something to
utf8 if the sender claims that it is text...

So I'm raising it here too!

Isn't 0300 a valid unicode character?

Yes, but it is not encoded as a single byte in UTF-8, it would be 2
bytes: o303 o200 (xC3 x80).

Anyway, when Emacs gets a selection request for the clipboard with type UTF8_STRING, it eventually ends up in xselect-convert-to-string. This function does:

       ((eq type 'UTF8_STRING)
        (setq str (encode-coding-string str 'utf-8)))

As far as I can tell, it does not check if str is all text, it seems to return non-text unconverted. Should we check str first? And if it does contain non-text, what should Emacs send back as type? STRING, TEXT?

Doesn't that all depend on buffer-file-coding-system and
selection-coding-system being set correctly?


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