From owner-svn-src-head@FreeBSD.ORG  Sun Aug 15 14:55:33 2010
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 0845B106564A;
	Sun, 15 Aug 2010 14:55:33 +0000 (UTC) (envelope-from des@FreeBSD.org)
Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:4f8:fff6::2c])
	by mx1.freebsd.org (Postfix) with ESMTP id EBE148FC12;
	Sun, 15 Aug 2010 14:55:32 +0000 (UTC)
Received: from svn.freebsd.org (localhost [127.0.0.1])
	by svn.freebsd.org (8.14.3/8.14.3) with ESMTP id o7FEtWL5063517;
	Sun, 15 Aug 2010 14:55:32 GMT (envelope-from des@svn.freebsd.org)
Received: (from des@localhost)
	by svn.freebsd.org (8.14.3/8.14.3/Submit) id o7FEtW75063515;
	Sun, 15 Aug 2010 14:55:32 GMT (envelope-from des@svn.freebsd.org)
Message-Id: <201008151455.o7FEtW75063515@svn.freebsd.org>
From: Dag-Erling Smorgrav <des@FreeBSD.org>
Date: Sun, 15 Aug 2010 14:55:32 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
	svn-src-head@freebsd.org
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Cc: 
Subject: svn commit: r211338 - head/lib/libutil
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
	<svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
	<mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
	<mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 15 Aug 2010 14:55:33 -0000

Author: des
Date: Sun Aug 15 14:55:32 2010
New Revision: 211338
URL: http://svn.freebsd.org/changeset/base/211338

Log:
  no-op commit to note that the example given in the previous commit is
  a very bad one, since the shift does not actually overflow.  This is
  a better example (assuming uint64_t = unsigned long long):
  
    ~0LLU >> 9             =   0x7fffffffffffffLLU
    ~0LLU >> 9 << 10       = 0xfffffffffffffc00LLU
    ~0LLU >> 9 << 10 >> 10 =   0x3fffffffffffffLLU

Modified:
  head/lib/libutil/expand_number.c

Modified: head/lib/libutil/expand_number.c
==============================================================================
--- head/lib/libutil/expand_number.c	Sun Aug 15 14:50:03 2010	(r211337)
+++ head/lib/libutil/expand_number.c	Sun Aug 15 14:55:32 2010	(r211338)
@@ -66,7 +66,7 @@ expand_number(const char *buf, uint64_t 
 		return (0);
 	}
 
-#define SHIFT(n, b)							\
+#define SHIFT(n, b) \
 	do { if (((n << b) >> b) != n) goto overflow; n <<= b; } while (0)
 
 	switch (tolower((unsigned char)*endptr)) {