f either of the input strings is empty.
</PRE>
<h4><a name="Files">Files</a></h4>
<PRE>
 
   None. 
 </PRE>
<h4><a name="Particulars">Particulars</a></h4>
<PRE>
 
   <b>cposr_c</b> is case sensitive. 
 
   An entire family of related CSPICE routines

      <a href="cpos_c.html">cpos_c</a>
      <b>cposr_c</b>
      <a href="ncpos_c.html">ncpos_c</a>
      <a href="ncposr_c.html">ncposr_c</a> 
      <a href="pos_c.html">pos_c</a>
      <a href="posr_c.html">posr_c</a> 

   is described in the Required Readin