From owner-freebsd-current@FreeBSD.ORG  Thu Jul 28 14:09:35 2011
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 1CB7F106564A
	for <freebsd-current@FreeBSD.org>; Thu, 28 Jul 2011 14:09:35 +0000 (UTC)
	(envelope-from avg@FreeBSD.org)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
	by mx1.freebsd.org (Postfix) with ESMTP id 55EBF8FC1F
	for <freebsd-current@FreeBSD.org>; Thu, 28 Jul 2011 14:09:33 +0000 (UTC)
Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua
	[212.40.38.101])
	by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id RAA24652
	for <freebsd-current@FreeBSD.ORG>;
	Thu, 28 Jul 2011 17:09:32 +0300 (EEST)
	(envelope-from avg@FreeBSD.org)
Message-ID: <4E316D9C.6060007@FreeBSD.org>
Date: Thu, 28 Jul 2011 17:09:32 +0300
From: Andriy Gapon <avg@FreeBSD.org>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
	rv:5.0) Gecko/20110705 Thunderbird/5.0
MIME-Version: 1.0
To: freebsd-current@FreeBSD.org
X-Enigmail-Version: 1.2pre
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: 
Subject: oddities with fgrep
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 28 Jul 2011 14:09:35 -0000

$ fgrep -w -r CS drm
...
drm/include/drm/drm_mode.h:#define DRM_MODE_FLAG_NCSYNC (1<<8)
$ fgrep -w -r CSY drm
...
drm/include/drm/drm_mode.h:#define DRM_MODE_FLAG_NCSYNC (1<<8)
$ fgrep -w -r CSYN drm
<nothing> (exit 1)
$ fgrep -w -r NCS drm
<nothing> (exit 1)
$ fgrep -w CS drm/include/drm/drm_mode.h
<nothing> (exit 1)

So looks like a potential bug in some optimization.
-w works correctly without -r.  With -r it works correctly for some substrings,
but not for others.

-- 
Andriy Gapon