/dev/clipboard corrupted

Corinna Vinschen corinna-cygwin@cygwin.com
Sat Jul 21 09:13:00 GMT 2012

On Jul 21 00:14, Thomas Wolff wrote:
> Am 19.07.2012 11:41, schrieb Corinna Vinschen:
> >On Jul  9 01:15, Thomas Wolff wrote:
> >>Am 04.07.2012 10:15, schrieb Corinna Vinschen:
> >>>On Jul  3 18:29, Thomas Wolff wrote:
> >>>>...
> >>>>* The current (CVS) code will not work if even the first character
> >>>>to be converted
> >>>>    needs more bytes than the buffer provides, e.g. if the
> >>>>application calls read() with length 1 only.
> >>>>    Some extra buffering would be needed to make it work then.
> >>>Yes, indeed.  I'll have a look.
> >>...
> >>>No, not yet.  This isn't exactly a regression from former behaviour.
> >>>Please provide a patch or remind me in a few weeks again.
> >>About the buffering I may send a patch when I find time.
> (Gave it a short try but no success yet.)
> >>>>* I had previously observed that with a read size of n only n-1
> >>>>bytes would be delivered
> >>>>    and thought this was on purpose because wcstombs appends a final
> >>>>nul to its result.
> >>>>    Now n bytes are returned (if available) and in fact the byte
> >>>>behind the read() buffer is
> >>>>    overwritten (see modified test program).
> >>>It's not Cygwin overwriting the byte, your testcase is...
> >>Both were, actually...
> >>>>...
> >>>>		n = read (fd, filebuf, filebuflen);
> >>>>		if (out_tty) {
> >>>>			filebuf [n] = 0;
> >>>Hmm, what if n == filebuflen?
> >>I admit my test case was bogus in this respect *BLUSH*.
> >>However, yet the error is there, as a fixed test case reveals.
> >>Also your own testcase does print out "OVERWRITTEN".
> >I don't see this.  I use the same "Scoloplos" testcase and my
> >code does not print "OVERWRITTEN".
> Beware that for the test case, you need to do a Windows paste; cp
> testfile /dev/clipboard will not do because you would take the
> "CYGWIN_NATIVE" branch then. Copy from notepad or mouse-copy from
> mintty will do.

No, it doesn't.  The clipboard was filled with Ctrl-A, Ctrl-C from
within notepad.


Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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