iswctype

NTSTATUS __cdecl iswctype(wint_t C, wctype_t Type){
  if( C >= 0x100u )
    return 0;
  else
    return Type & (*pwctype)[C];
}

Referenced by:

RtlEthernetStringToAddressW
RtlIpv4StringToAddressExW
RtlIpv4StringToAddressW
RtlIpv6StringToAddressExW
RtlIpv6StringToAddressW
iswalnum
iswalpha
iswdigit
iswspace
towlower
winput_s