RtlStringCchCopyNW - NtDoc

#ifndef _NTSTRSAFE_H_INCLUDED_
#ifndef NTSTRSAFE_LIB_IMPL
#ifndef NTSTRSAFE_NO_CCH_FUNCTIONS

NTSTRSAFEDDI
    RtlStringCchCopyNW(
            _Out_writes_(cchDest) _Always_(_Post_z_) NTSTRSAFE_PWSTR pszDest,
            _In_ size_t cchDest,
            _In_reads_or_z_(cchToCopy) STRSAFE_PCNZWCH pszSrc,
            _In_ size_t cchToCopy)
{
    NTSTATUS status;

    status = RtlStringValidateDestW(pszDest, cchDest, NTSTRSAFE_MAX_CCH);

    if (NT_SUCCESS(status))
    {
        if (cchToCopy > NTSTRSAFE_MAX_LENGTH)
        {
            status = STATUS_INVALID_PARAMETER;

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

    return status;
}

#endif
#endif
#endif
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