RtlInt8ToULong - NtDoc

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

//
// INT8 -> ULONG conversion
//
_Must_inspect_result_
__inline
NTSTATUS
RtlInt8ToULong(
    _In_ INT8 i8Operand,
    _Out_ _Deref_out_range_(==, i8Operand) ULONG* pulResult)
{
    NTSTATUS status;
    
    if (i8Operand >= 0)
    {
        *pulResult = (ULONG)i8Operand;
        status = STATUS_SUCCESS;
    }
    else
    {
        *pulResult = ULONG_ERROR;
        status = STATUS_INTEGER_OVERFLOW;
    }

    return status;
}

#endif
#endif
View code on GitHub