#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
//
// ULONG_PTR addition
//
#ifdef _WIN64

#define RtlULongPtrAdd     RtlULongLongAdd

#endif
#endif
#endif
View code on GitHub

#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
//
// ULONG_PTR addition
//
#ifdef _WIN64
// ...
#else

_Must_inspect_result_
__inline
NTSTATUS
RtlULongPtrAdd(
    _In_ ULONG_PTR ulAugend,
    _In_ ULONG_PTR ulAddend,
    _Out_ _Deref_out_range_(==, ulAugend + ulAddend) ULONG_PTR* pulResult)
{
    NTSTATUS status;

    if ((ulAugend + ulAddend) >= ulAugend)
    {
        *pulResult = (ulAugend + ulAddend);
        status = STATUS_SUCCESS;
    }
    else
    {
        *pulResult = ULONG_PTR_ERROR;
        status = STATUS_INTEGER_OVERFLOW;
    }

    return status;
}

#endif
#endif
#endif
View code on GitHub

// ntintsafe.h

NTSTATUS RtlULongPtrAdd(
  [in]  ULONG_PTR ulAugend,
  [in]  ULONG_PTR ulAddend,
  [out] ULONG_PTR *pulResult
);
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (nf-ntintsafe-rtlulongptradd)

RtlULongPtrAdd function

Description

Adds two values of type ULONG_PTR.

Parameters

`ulAugend` [in]

The first value in the equation.

`ulAddend` [in]

The value to add to ulAugend.

`pulResult` [out]

A pointer to the sum. If the operation results in a value that overflows or underflows the capacity of the type, the function returns STATUS_INTEGER_OVERFLOW and this parameter is not valid.

Return value

Returns STATUS_SUCCESS if the operation is successful.

See the implementation of this helper function in ntintsafe.h in the WDK for possible error return values.

View the official Windows Driver Kit DDI reference