he input source is a file or a byte stream then
 this is the byte offset into that stream, but if the input source is
 a character media then the offset is the character offset.
 Returns -1 if there is no offset available.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the offset of input source stream, or -1 if there is
 no offset available</dd>
</dl>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
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