PnpConcatenateUnicodeStrings

NTSTATUS __fastcall PnpConcatenateUnicodeStrings(_UNICODE_STRING *DestinationString, _UNICODE_STRING *SourceString){
  NTSTATUS result; 

  result = IopAllocateUnicodeString(DestinationString, SourceString->Length);
  if( result >= 0 )
  {
    RtlCopyUnicodeString(DestinationString, SourceString);
    return 0;
  }
  return result;
}

Referenced by:

IoGetDeviceDirectory
IoGetDeviceInstanceName
PiCreateDirectoryPath
PiCreateRegistryPath
PiDeviceRegistration
PiInitializeDevice
PipServiceInstanceToDeviceInstance