RtlWideCharArrayCopyStringWorker - NtDoc

#ifndef _NTSTRSAFE_H_INCLUDED_
#ifndef NTSTRSAFE_NO_UNICODE_STRING_FUNCTIONS

NTSTRSAFEWORKERDDI
RtlWideCharArrayCopyStringWorker(
        _Out_writes_to_(cchDest, *pcchNewDestLength) wchar_t* pszDest,
        _In_ size_t cchDest,
        _Out_ size_t* pcchNewDestLength,
        _In_ NTSTRSAFE_PCWSTR pszSrc,
        _In_ size_t cchToCopy);

#endif
#endif
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#ifndef _NTSTRSAFE_H_INCLUDED_
// Below here are the worker functions that actually do the work
#if defined(NTSTRSAFE_LIB_IMPL) || !defined(NTSTRSAFE_LIB)
#ifndef NTSTRSAFE_NO_UNICODE_STRING_FUNCTIONS

NTSTRSAFEWORKERDDI
    RtlWideCharArrayCopyStringWorker(
            _Out_writes_to_(cchDest, *pcchNewDestLength) wchar_t* pszDest,
            _In_ size_t cchDest,
            _Out_ size_t* pcchNewDestLength,
            _In_ NTSTRSAFE_PCWSTR pszSrc,
            _In_ size_t cchToCopy)
{
    NTSTATUS status = STATUS_SUCCESS;
    size_t cchNewDestLength = 0;

    while (cchDest && cchToCopy && (*pszSrc != L'\0'))
    {
        *pszDest++ = *pszSrc++;
        cchDest--;
        cchToCopy--;

        cchNewDestLength++;
    }

    if ((cchDest == 0) && (cchToCopy != 0) && (*pszSrc != L'\0'))
    {
        // we are going to truncate pszDest
        status = STATUS_BUFFER_OVERFLOW;
    }

    *pcchNewDestLength = cchNewDestLength;

    return status;
}

#endif
#endif
#endif
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#ifndef _NTSTRSAFE_H_INCLUDED_
// Do not call these functions, they are worker functions for internal use within this file
#ifdef DEPRECATE_SUPPORTED
// ...
#else

#define RtlWideCharArrayCopyStringWorker    RtlWideCharArrayCopyStringWorker_instead_use_RtlUnicodeStringCopyString_or_RtlUnicodeStringCopyStringEx

#endif
#endif
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