RtlLongLongToUShort - NtDoc

#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)

//
// LONGLONG -> USHORT conversion
//
_Must_inspect_result_
__inline
NTSTATUS
RtlLongLongToUShort(
    _In_ LONGLONG llOperand,
    _Out_ _Deref_out_range_(==, llOperand) USHORT* pusResult)
{
    NTSTATUS status;
    
    if ((llOperand >= 0) && (llOperand <= USHORT_MAX))
    {
        *pusResult = (USHORT)llOperand;
        status = STATUS_SUCCESS;
    }
    else
    {
        *pusResult = USHORT_ERROR;
        status = STATUS_INTEGER_OVERFLOW;
    }
    
    return status;
}

#endif
#endif
View code on GitHub