RtlStringCchPrintfW - NtDoc

#ifndef _NTSTRSAFE_H_INCLUDED_
#ifndef NTSTRSAFE_LIB_IMPL
#ifndef _M_CEE_PURE
#ifndef NTSTRSAFE_NO_CCH_FUNCTIONS

NTSTRSAFEDDI
    RtlStringCchPrintfW(
            _Out_writes_(cchDest) _Always_(_Post_z_) NTSTRSAFE_PWSTR pszDest,
            _In_ size_t cchDest,
            _In_ _Printf_format_string_ NTSTRSAFE_PCWSTR pszFormat,
            ...)
{
    NTSTATUS status;

    status = RtlStringValidateDestW(pszDest, cchDest, NTSTRSAFE_MAX_CCH);

    if (NT_SUCCESS(status))
    {
        va_list argList;

        va_start(argList, pszFormat);

        status = RtlStringVPrintfWorkerW(pszDest,
                cchDest,
                NULL,
                pszFormat,
                argList);

        va_end(argList);
    }
    else if (cchDest > 0)
    {
        *pszDest = '\0';
    }

    return status;
}

#endif
#endif
#endif
#endif
View code on GitHub