--- xnu/xnu-792.6.76/libkern/c++/OSSet.cpp
+++ xnu/xnu-2050.9.2/libkern/c++/OSSet.cpp
@@ -1,23 +1,29 @@
 /*
  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /* IOSet.m created by rsulack on Thu 11-Jun-1998 */
 
@@ -70,6 +76,7 @@
         return false;
 
     for ( unsigned int i = 0; i < inCount; i++ ) {
+// xx-review: no test here for failure of setObject()
         if (members->getCount() < inCapacity)
             setObject(inObjects[i]);
         else
@@ -189,27 +196,36 @@
 
 bool OSSet::setObject(const OSMetaClassBase *anObject)
 {
-    if (containsObject(anObject))
-        return false;
-    else {
+    if (containsObject(anObject)) {
+        return false;
+    } else {
         haveUpdated();
         return members->setObject(anObject);
     }
 }
 
-bool OSSet::merge(const OSArray *array)
-{
-    const OSMetaClassBase *anObject;
-    bool retVal = false;
-
-    for (int i = 0; (anObject = array->getObject(i)); i++)
-        if (setObject(anObject))
-            retVal = true;
-
-    return retVal;
-}
-
-bool OSSet::merge(const OSSet *set)
+bool OSSet::merge(const OSArray * array)
+{
+    const OSMetaClassBase * anObject = 0;
+    bool                    result   = true;
+
+    for (int i = 0; (anObject = array->getObject(i)); i++) {
+
+       /* setObject() returns false if the object is already in the set,
+        * so we have to check beforehand here with containsObject().
+        */
+        if (containsObject(anObject)) {
+            continue;
+        }
+        if (!setObject(anObject)) {
+            result = false;
+        }
+    }
+
+    return result;
+}
+
+bool OSSet::merge(const OSSet * set)
 {
     return merge(set->members);
 }
@@ -264,6 +280,8 @@
 
     for ( i = 0; i < count; i++ ) {
         obj1 = aSet->members->getObject(i);
+	if (containsObject(obj1))
+		continue;
         obj2 = members->getObject(i);
         if ( !obj1 || !obj2 )
                 return false;