diff --git a/lib/mac/MacMemoryAllocator/src/nsNewPtrMalloc.cp b/lib/mac/MacMemoryAllocator/src/nsNewPtrMalloc.cp
new file mode 100644
index 00000000000..9aeaac6956d
--- /dev/null
+++ b/lib/mac/MacMemoryAllocator/src/nsNewPtrMalloc.cp
@@ -0,0 +1,84 @@
+/* -*- Mode: C++;    tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- 
+ * 
+ * The contents of this file are subject to the Netscape Public License 
+ * Version 1.0 (the "NPL"); you may not use this file except in 
+ * compliance with the NPL. You may obtain a copy of the NPL at  
+ * http://www.mozilla.org/NPL/ 
+ * 
+ * Software distributed under the NPL is distributed on an "AS IS" basis, 
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL 
+ * for the specific language governing rights and limitations under the 
+ * NPL. 
+ * 
+ * The Initial Developer of this code under the NPL is Netscape 
+ * Communications Corporation. Portions created by Netscape are 
+ * Copyright (C) 1998 Netscape Communications Corporation. All Rights    
+ * Reserved. */
+
+#include <MacMemory.h>
+
+#include <string.h>
+#include <stdlib.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void *malloc(size_t blockSize);
+void free(void *deadBlock);
+void* realloc(void* block, size_t newSize);
+void *calloc(size_t nele, size_t elesize);
+
+#ifdef __cplusplus
+}
+#endif
+
+
+// NewPtr implementation of malloc/free, for testing purposes
+
+//--------------------------------------------------------------------
+void *malloc(size_t blockSize)
+//--------------------------------------------------------------------
+{
+	return (void *)::NewPtr(blockSize);
+}
+
+
+//--------------------------------------------------------------------
+void free(void *deadBlock)
+//--------------------------------------------------------------------
+{
+	if (deadBlock)
+		::DisposePtr((Ptr)deadBlock);
+}
+
+
+//--------------------------------------------------------------------
+void* realloc(void* block, size_t newSize)
+//--------------------------------------------------------------------
+{
+	::SetPtrSize((Ptr)block, newSize);
+	if (MemError() == noErr)
+		return block;
+	
+	void*	newBlock = ::NewPtr(newSize);
+	if (!newBlock) return nil;
+	
+	BlockMoveData(block, newBlock, newSize);	// might copy off the end of block,
+												// but who cares?
+	
+	return newBlock;
+}
+
+//--------------------------------------------------------------------
+void *calloc(size_t nele, size_t elesize)
+//--------------------------------------------------------------------
+{
+	size_t	space = nele * elesize;
+	void	*newBlock = ::malloc(space);
+	if (newBlock)
+		memset(newBlock, 0, space);
+	return newBlock;
+}
+