From 6c2d2a3a04f2da57da43a3e2c5dfbe5dc7d67063 Mon Sep 17 00:00:00 2001
From: Hans Fugal <hans@fugal.net>
Date: Sat, 3 Jun 2006 00:14:53 +0000
Subject: [PATCH]  r20@gandalf:  fugalh | 2006-06-02 18:14:26 -0600  change_bit
 bounds check

git-svn-id: svn://localhost/ardour2/trunk@561 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/ardour/globals.cc | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/libs/ardour/globals.cc b/libs/ardour/globals.cc
index 4879e373d5..23e93ee2a9 100644
--- a/libs/ardour/globals.cc
+++ b/libs/ardour/globals.cc
@@ -323,10 +323,17 @@ ARDOUR::new_change ()
 	Change c;
 	static uint32_t change_bit = 1;
 
-	/* XXX catch out-of-range */
+	/* catch out-of-range */
+	if (!change_bit)
+	{
+		fatal << _("programming error: ")
+			<< "change_bit out of range in ARDOUR::new_change()"
+			<< endmsg;
+		/*NOTREACHED*/
+	}
 
 	c = Change (change_bit);
-	change_bit <<= 1;
+	change_bit <<= 1;	// if it shifts too far, change_bit == 0
 
 	return c;
 }