RtlUIntPtrToUChar - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)

//
// UINT_PTR -> UCHAR conversion
//
_Must_inspect_result_
__inline
NTSTATUS
RtlUIntPtrToUChar(
    _In_ UINT_PTR uOperand,
    _Out_ _Deref_out_range_(==, uOperand) UCHAR* pch)
{
    NTSTATUS status;

    if (uOperand <= 255)
    {
        *pch = (UCHAR)uOperand;
        status = STATUS_SUCCESS;
    }
    else
    {
        *pch = '\0';
        status = STATUS_INTEGER_OVERFLOW;
    }

    return status;
}

#endif
#endif

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// ntintsafe.h

NTSTATUS RtlUIntPtrToUChar(
  [in]  UINT_PTR uOperand,
  [out] UCHAR    *pch
);
View the official Windows Driver Kit DDI reference

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

RtlUIntPtrToUChar function

Description

Converts a value of type UINT_PTR to a value of type UCHAR.

Parameters

uOperand [in]

The value to be converted.

pch [out]

A pointer to the converted value. In the case where the conversion causes a truncation of the original value, 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 type conversions and perform validity checks with minimal impact on performance.

This function uses the following alternate name:

View the official Windows Driver Kit DDI reference

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