LdrpGetParentLangId

NTSTATUS __stdcall LdrpGetParentLangId(UINT16 LangId, UINT16 *ParentLangId){
  UINT16 v2; 
  wchar_t Name[88]; 
  WCHAR ParentLanguageName[88]; 

  v2 = 0;
  if( !ParentLangId || !DownLevelLangIDToLanguageName(LangId, Name, 85i64, 2ui64) )
    return -1073741811;
  if( DownLevelGetParentLanguageName(Name, ParentLanguageName) >= 2 )
    v2 = DownLevelLanguageNameToLangID(ParentLanguageName, 2ui64);
  *ParentLangId = v2;
  return 0;
}

Referenced by:

LdrResFallbackLangList
LdrpSearchResourceSection_U