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diff --git a/LibOVR/Src/Kernel/OVR_String_FormatUtil.cpp b/LibOVR/Src/Kernel/OVR_String_FormatUtil.cpp
new file mode 100644
index 0000000..a6ceb3a
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+++ b/LibOVR/Src/Kernel/OVR_String_FormatUtil.cpp
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+/************************************************************************************
+
+Filename    :   OVR_String_FormatUtil.cpp
+Content     :   String format functions.
+Created     :   February 27, 2013
+Notes       : 
+
+Copyright   :   Copyright 2013 Oculus VR, Inc. All Rights reserved.
+
+Use of this software is subject to the terms of the Oculus license
+agreement provided at the time of installation or download, or which
+otherwise accompanies this software in either electronic or hard copy form.
+
+************************************************************************************/
+
+#include "OVR_String.h"
+#include "OVR_Log.h"
+
+namespace OVR {
+
+void StringBuffer::AppendFormat(const char* format, ...)
+{       
+    va_list argList;
+
+    va_start(argList, format);
+    UPInt size = OVR_vscprintf(format, argList);
+    va_end(argList);
+
+    char* buffer = (char*) OVR_ALLOC(sizeof(char) * (size+1));
+
+    va_start(argList, format);
+    UPInt result = OVR_vsprintf(buffer, size+1, format, argList);
+    OVR_UNUSED1(result);
+    va_end(argList);
+    OVR_ASSERT_LOG(result == size, ("Error in OVR_vsprintf"));
+
+    AppendString(buffer);
+
+    OVR_FREE(buffer);
+}
+
+} // OVR