RtlStringCbVPrintfW - NtDoc

#ifndef _NTSTRSAFE_H_INCLUDED_
#ifndef NTSTRSAFE_LIB_IMPL
#ifndef NTSTRSAFE_NO_CB_FUNCTIONS

NTSTRSAFEDDI
    RtlStringCbVPrintfW(
            _Out_writes_bytes_(cbDest) _Always_(_Post_z_) NTSTRSAFE_PWSTR pszDest,
            _In_ size_t cbDest,
            _In_ _Printf_format_string_ NTSTRSAFE_PCWSTR pszFormat,
            _In_ va_list argList)
{
    NTSTATUS status;
    size_t cchDest = cbDest / sizeof(wchar_t);

    status = RtlStringValidateDestW(pszDest, cchDest, NTSTRSAFE_MAX_CCH);

    if (NT_SUCCESS(status))
    {
        status = RtlStringVPrintfWorkerW(pszDest,
                cchDest,
                NULL,
                pszFormat,
                argList);
    }
    else if (cchDest > 0)
    {
        *pszDest = '\0';
    }

    return status;
}

#endif
#endif
#endif
View code on GitHub