code> function is available in two forms:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            A 2-argument form: <code class="computeroutput">buffer_copy(target, source)</code>
          </li>
<li class="listitem">
            A 3-argument form: <code class="computeroutput">buffer_copy(target, source, max_bytes_to_copy)</code>
          </li>
</ul></div>
<p>
        Both forms return the number of bytes actually copied. The number 