size_t _mbclen2(const unsigned int s)
int _ismbstrail(const unsigned char *start, const unsigned char *str)
int _ismbbtrail(unsigned int c)
_Check_return_ _CRTIMP int __cdecl _ismbslead(_In_reads_z_(_Pos - _Str+1) const unsigned char *_Str, _In_z_ const unsigned char *_Pos)
MSVCRT_pthreadmbcinfo get_mbcinfo(void)