From owner-freebsd-hackers@FreeBSD.ORG  Mon May 16 21:15:03 2005
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 39EAD16A4CE
	for <freebsd-hackers@freebsd.org>;
	Mon, 16 May 2005 21:15:03 +0000 (GMT)
Received: from priv-edtnes27.telusplanet.net (outbound04.telus.net
	[199.185.220.223])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 7E8BE43D98
	for <freebsd-hackers@freebsd.org>;
	Mon, 16 May 2005 21:15:02 +0000 (GMT)
	(envelope-from cpressey@catseye.mine.nu)
Received: from catseye.biscuit.boo ([154.20.76.195])
	by priv-edtnes27.telusplanet.netSMTP
	<20050516211459.UHPQ29154.priv-edtnes27.telusplanet.net@catseye.biscuit.boo>
	for <freebsd-hackers@freebsd.org>;
	Mon, 16 May 2005 15:14:59 -0600
Date: Mon, 16 May 2005 14:18:30 -0700
From: Chris Pressey <cpressey@catseye.mine.nu>
To: freebsd-hackers@freebsd.org
Message-Id: <20050516141830.6d0ea55e.cpressey@catseye.mine.nu>
In-Reply-To: <20050516171143.GA19979@skatecity>
References: <20050516171143.GA19979@skatecity>
Organization: Cat's Eye Technologies
X-Mailer: Sylpheed version 1.0.4 (GTK+ 1.2.10; i386-portbld-freebsd4.9)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Subject: Re: Console ASCII interpretation
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 16 May 2005 21:15:03 -0000

On Mon, 16 May 2005 19:11:44 +0200
alexander <arundel@h3c.de> wrote:

> Hi there.
> 
> I'm using syscall number 4 write() to output data to stdout using x86
> assembly. When I try to output the following DWORD: 0x00003532 I get
> the following output under Eterm and xterm:  "25". Which is exactly
> what I want.
> 
> However when I do the very same under the console (using bash or sh.
> It doesn't matter) I get this output: "25  ".
> 
> I looked up the ASCII value for 00h and it says NUL. Doesn't that mean
> that there shouldn't be any output at all?

syscons and xterm implement different terminal emulations.  xterm
attempts to be compatible with a DEC VT102 and/or VT220, which treat NUL
as non-printing.  syscons doesn't aim to be compatible with anything in
particular (so there is no standard to which it can be held to for
rendering NUL as a blank space.)  See the respective manual pages for
more information.

-Chris