def get_standard_file(standard):
    """ Map the standard to a file """

    standard_files = {"C2004": "misra-c2004-guidelines.csv",
                      "C2012": "misra-c2012-guidelines.csv",
                      "CPP2008": "misra-cpp2008-guidelines.csv"}

    if standard in standard_files.keys():
        return standard_files[standard]

    return None