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

#define RtlDWordPtrAdd     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)
//
// DWORD_PTR addition
//
#ifdef _WIN64
// ...
#else

_Must_inspect_result_
__inline
NTSTATUS
RtlDWordPtrAdd(
    _In_ DWORD_PTR dwAugend,
    _In_ DWORD_PTR dwAddend,
    _Out_ _Deref_out_range_(==, dwAugend + dwAddend) DWORD_PTR* pdwResult)
{
    NTSTATUS status;

    if ((dwAugend + dwAddend) >= dwAugend)
    {
        *pdwResult = (dwAugend + dwAddend);
        status = STATUS_SUCCESS;
    }
    else
    {
        *pdwResult = DWORD_PTR_ERROR;
        status = STATUS_INTEGER_OVERFLOW;
    }

    return status;
}

#endif
#endif
#endif
View code on GitHub

// ntintsafe.h

NTSTATUS RtlDWordPtrAdd(
  [in]  DWORD_PTR dwAugend,
  [in]  DWORD_PTR dwAddend,
  [out] DWORD_PTR *pdwResult
);
View the official Windows Driver Kit DDI reference

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

RtlDWordPtrAdd function

Description

Adds two values of type DWORD_PTR.

Parameters

`dwAugend` [in]

The first value in the equation.

`dwAddend` [in]

The value to add to dwAugend.

`pdwResult` [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.

Remarks

This is one of a set of inline functions designed to provide arithmetic operations and perform validity checks with minimal impact on performance.

View the official Windows Driver Kit DDI reference