From owner-freebsd-arch@FreeBSD.ORG  Wed Feb 13 20:22:13 2008
Return-Path: <owner-freebsd-arch@FreeBSD.ORG>
Delivered-To: freebsd-arch@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 4AC5416A475
	for <freebsd-arch@freebsd.org>; Wed, 13 Feb 2008 20:22:13 +0000 (UTC)
	(envelope-from rick@kiwi-computer.com)
Received: from kiwi-computer.com (keira.kiwi-computer.com [63.224.10.3])
	by mx1.freebsd.org (Postfix) with SMTP id D00D613C44B
	for <freebsd-arch@freebsd.org>; Wed, 13 Feb 2008 20:22:12 +0000 (UTC)
	(envelope-from rick@kiwi-computer.com)
Received: (qmail 93180 invoked by uid 2001); 13 Feb 2008 19:55:31 -0000
Date: Wed, 13 Feb 2008 13:55:31 -0600
From: "Rick C. Petty" <rick-freebsd@kiwi-computer.com>
To: Marcel Moolenaar <xcllnt@mac.com>
Message-ID: <20080213195531.GA93104@keira.kiwi-computer.com>
References: <20080213150500.GH1340@hoeg.nl>
	<A86365DD-5D15-42F2-A810-493B9F9E7AA3@mac.com>
	<20080213192808.GL1340@hoeg.nl>
	<2672DC03-9293-4A92-969B-074CAB55176B@mac.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <2672DC03-9293-4A92-969B-074CAB55176B@mac.com>
User-Agent: Mutt/1.4.2.3i
Cc: Ed Schouten <ed@fxq.nl>, FreeBSD Arch <freebsd-arch@freebsd.org>
Subject: Re: Proposal for redesigning the TTY layer
X-BeenThere: freebsd-arch@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: rick-freebsd@kiwi-computer.com
List-Id: Discussion related to FreeBSD architecture <freebsd-arch.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arch>
List-Post: <mailto:freebsd-arch@freebsd.org>
List-Help: <mailto:freebsd-arch-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arch>,
	<mailto:freebsd-arch-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 13 Feb 2008 20:22:13 -0000

On Wed, Feb 13, 2008 at 11:36:56AM -0800, Marcel Moolenaar wrote:
> 
> >I personnally think we shouldn't put multibyte-handling inside the
> >clists, but within the drivers, like syscons.
> 
> The problem with doing it that way is that insertion of control
> characters, like XON/XOFF or STOP may happen right in the middle
> of UTF-8 sequences. This may be problematic...

Technically this shouldn't be a problem, because all subsequent UTF-8 bytes
have bit 7 set and bit 6 cleared and XON/XOFF are 7-bit clean, so it should
be pretty obvious that the handshaking happens in the middle of a multibyte
sequence.

-- Rick C. Petty