From owner-freebsd-hackers@FreeBSD.ORG  Tue Mar 10 22:59:18 2009
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id CB5C7106564A
	for <freebsd-hackers@freebsd.org>; Tue, 10 Mar 2009 22:59:18 +0000 (UTC)
	(envelope-from jimmy@mammothcheese.ca)
Received: from smtp102.rog.mail.re2.yahoo.com (smtp102.rog.mail.re2.yahoo.com
	[206.190.36.80]) by mx1.freebsd.org (Postfix) with SMTP id 6368A8FC15
	for <freebsd-hackers@freebsd.org>; Tue, 10 Mar 2009 22:59:18 +0000 (UTC)
	(envelope-from jimmy@mammothcheese.ca)
Received: (qmail 58990 invoked from network); 10 Mar 2009 22:59:17 -0000
Received: from unknown (HELO ?72.138.160.206?) (jimmy@72.138.160.206 with
	plain)
	by smtp102.rog.mail.re2.yahoo.com with SMTP; 10 Mar 2009 22:59:17 -0000
X-YMail-OSG: ALtQFRkVM1ntaqc3G9ZtJ1BTyxmpvekSUVLn.00R1gLTWDav.xPyH05o3dy5NbCZqQ--
X-Yahoo-Newman-Property: ymail-3
Message-ID: <49B6F0C5.8050706@mammothcheese.ca>
Date: Tue, 10 Mar 2009 18:59:17 -0400
From: James Bailie <jimmy@mammothcheese.ca>
User-Agent: Thunderbird 2.0.0.19 (X11/20090116)
MIME-Version: 1.0
To: jimmy@mammothcheese.ca
References: <49B6DC95.9070607@FreeBSD.org> <49B6E91A.4040604@mammothcheese.ca>
In-Reply-To: <49B6E91A.4040604@mammothcheese.ca>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: freebsd-hackers@freebsd.org
Subject: Re: fgetc doubts
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: jimmy@mammothcheese.ca
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: Tue, 10 Mar 2009 22:59:19 -0000

I must correct myself.  It's more likely the return value of fgetc(),
after having been assigned to a char, is being sign-extended when that
char is compared to the in EOF, so that the comparison becomes a
comparison between 0xffffffff and 0xffffffff.

James Bailie wrote:
> ...EOF is getting cast to a char implicitly in the comparison, so the
> comparison becomes a comparison between 0xff and 0xff.

-- 
James Bailie <jimmy@mammothcheese.ca>
http://www.mammothcheese.ca