ed input function reads from any scanning buffer and is named
    <code class="code">bscanf</code>.</p>

<p>Generally speaking, the formatted input functions have 3 arguments:</p>
<ul>
<li>the first argument is a source of characters for the input,</li>
<li>the second argument is a format string that specifies the values to
      read,</li>
<li>the third argument is a <em>receiver function</em> that is applied to the
      values read.</li>
</ul>
<p>Hence, a typical call to the formatted input function <a h