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

//
// UINT8 -> CHAR conversion
//
__forceinline
NTSTATUS
RtlUInt8ToChar(
    _In_ UINT8 u8Operand,
    _Out_ _Deref_out_range_(==, u8Operand) CHAR* pch)
{
#ifdef _CHAR_UNSIGNED
    *pch = (CHAR)u8Operand;
    return STATUS_SUCCESS;
#else
    return RtlUInt8ToInt8(u8Operand, (INT8*)pch);
#endif
}

#endif
#endif
View code on GitHub

// ntintsafe.h

NTSTATUS RtlUInt8ToChar(
  [in]  UINT8 u8Operand,
  [out] CHAR  *pch
);
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (nf-ntintsafe-rtluint8tochar)

RtlUInt8ToChar function

Description

Converts a value of type UINT8 to a value of type CHAR.

Parameters

`u8Operand` [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.

View the official Windows Driver Kit DDI reference