RtlStringCbCopyNW - NtDoc

#ifndef _NTSTRSAFE_H_INCLUDED_
#ifndef NTSTRSAFE_LIB_IMPL
#ifndef NTSTRSAFE_NO_CB_FUNCTIONS

NTSTRSAFEDDI
    RtlStringCbCopyNW(
            _Out_writes_bytes_(cbDest) NTSTRSAFE_PWSTR pszDest,
            _In_ size_t cbDest,
            _In_reads_bytes_(cbToCopy) STRSAFE_PCNZWCH pszSrc,
            _In_ size_t cbToCopy)
{
    NTSTATUS status;
    size_t cchDest = cbDest / sizeof(wchar_t);

    status = RtlStringValidateDestW(pszDest, cchDest, NTSTRSAFE_MAX_CCH);

    if (NT_SUCCESS(status))
    {
        size_t cchToCopy = cbToCopy / sizeof(wchar_t);

        if (cchToCopy > NTSTRSAFE_MAX_LENGTH)
        {
            status = STATUS_INVALID_PARAMETER;

            *pszDest = L'\0';
        }
        else
        {
            status = RtlStringCopyWorkerW(pszDest,
                    cchDest,
                    NULL,
                    pszSrc,
                    cchToCopy);
        }
    }

    return status;
}

#endif
#endif
#endif
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