than zero or greater
than the number of history entries. 
</td></tr>
</table>

<p>
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<tr>
<td align="left">HIST_ENTRY * <b>previous_history</b><i> </i>(<i>void</i>)<i>
     </i></td>
<td align="right">Functie</td>
</tr>
</table>
<table width="95%" align="center">
<tr><td>
Back up the current history offset to the previous history entry, and
return a pointer to that entry.  If there is no previous entry, return
a <code>NULL</code> pointer. 
</td></tr>
</table>

<p>
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<tr