[Fwd: Strange-Dangerous behaviour in Cygwin]

[Jim Meyering]

Eric Blake <ebb9@byu.net> wrote:
> 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?

I don't think changing yesno would be appropriate in this case.

What if the string is "n\by"?
What if \b is not the erase character?
What if the string is "yes" and `e' is the `erase' character?
Should it handle both DEL and ERASE characters?
Should it also handle word-erase and line-erase characters?
I know you said `normally used...', so I assume you wanted
something simple, befitting yesno's status, but I don't see
an appropriate way to solve the problem by changing yesno.

Alternative opinions (or patches to yesno.c) welcome.

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