'</tt> terminated format string. The terminator character will not be output.</dd>
<dt>...</dt>
<dd>Optional arguments...</dd>

</dl>
</div>


<div class="para ret">
<h4>Return Values</h4>
<p>When the string was written successfuly, it returns number of character encoding units written to the file. When the function failed due to disk full or an error, a negative value will be returned.</p>
</div>


<div class="para desc">
<h4>Description</h4>
<p>The format control directive is a sub-set of standard library