[Fwd: Strange-Dangerous behaviour in Cygwin]

[Eric Blake <ebb9 at byu dot net>]

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Relevant clips from this cygwin bug report.  When tty settings are weird
(I'm not sure whether the bug is in cygwin, xterm, or just bad tty
settings that could be reproduced elsewhere), backspace only repositions
the cursor on screen, so that the actual buffer read by yesno() can
contain "y\bn" instead of "n".  Is it possible for lib/yesno.c to be a
little more paranoid and check that there are not embedded characters
normally used in terminal editing that would undo the first character?

- -------- Original Message --------
Subject: Strange-Dangerous behaviour in Cygwin
Date: Sat, 07 May 2005 17:52:10 +0200 (MET DST)
From: Angelo Graziosi <Angelo.Graziosi@roma1.infn.it>
To: cygwin@cygwin.com, corinna-cygwin@cygwin.com

I discovered the following strange behaviour in bash and xterm (startxwin)
shells:

Suppose having

   alias rm='rm -i'
   alias cp='cp -i -p'
   alias mv='mv -i'

then

   rm foo.txt

writes

   rm: remove regular file `foo.txt'?

Suppose that I does not want to remove it but mistaking I type "y"

   rm: remove regular file `foo.txt'? y

Before the RETURN, I see the error so I correct, with BACKSPACE, "y" in
"n":

BACKSPACE does not delete "y" as aspected but it only shifts the cursor on
"y" and when I type "n" and then RETURN the file foo.txt is REMOVED!

- --
Life is short - so eat dessert first!

Eric Blake             ebb9@byu.net
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