linux-kernel - Re: [PATCH] Fix backspace on wrapped lines in console (virtual terminal)

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Message-ID: <48D672DE.3010509@skyrush.com>
Date:	Sun, 21 Sep 2008 10:14:22 -0600
From:	Joe Peterson <joe@...rush.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>, hpa@...or.com
Subject: Re: [PATCH] Fix backspace on wrapped lines in console (virtual terminal)

Joe Peterson wrote:
> xterm has a "private mode 45", which turns on reverseWrap, allowing
> backspace to wrap.  This is similar to mode 7 (supported on xterm and
> vt), which is DEVAWM (auto wrap mode).
> 
> I agree that hard-coding backspace/reverse wrap would likely be wrong
> (even though it looks like some terminal emulators I've seen, like
> "screen" add the feature), but would it be appropriate to add mode 45 to
> vt, allowing reverse wrap as an option?

I have worked up a new patch (attached) for review.  It adds the private
mode 45 I mentioned above, but defaults it to off, preserving the old
default of no backspace wrap to the previous line.  This matches xterm's
reverse-wrap behavior (and default settings), so the same escape
sequence can be used to control this mode in both xterm and console/vt.

						-Joe

View attachment "vt-fix-wrapped-backspace.patch" of type "text/plain" (4290 bytes)