Hi Haidong, On 9/9/21 10:46 AM, Haidong Yu wrote: > @@ -2854,6 +2854,8 @@ size_t CDECL wcslen(const wchar_t *str) > */ > wchar_t* CDECL wcsstr(const wchar_t *str, const wchar_t *sub) > { > + if (!str) return NULL; > + It doesn't match with native. The function is supposed to crash on NULL str. Thanks, Piotr