><div class="line">    <span class="keywordflow">if</span> (argc &gt; 1) {</div><div class="line">        ca_file = argv[1];</div><div class="line">    } <span class="keywordflow">else</span> {</div><div class="line">        printf(<span class="stringliteral">&quot;error: path to the CA certificate to use\n&quot;</span>);</div><div class="line">        exit(1);</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="comment">/* get address (argv[2] if present) */</span><