/*

-Procedure wnextd_c ( Extract the endpoints from a DP window )

-Abstract
 
   Extract the left or right endpoints from a double precision 
   window. 
 
-Disclaimer

   THIS SOFTWARE AND ANY RELATED MATERIALS WERE CREATED BY THE
   CALIFORNIA INSTITUTE OF TECHNOLOGY (CALTECH) UNDER A U.S.
   GOVERNMENT CONTRACT WITH THE NATIONAL AERONAUTICS AND SPACE
   ADMINISTRATION (NASA). THE SOFTWARE IS TECHNOLOGY AND SOFTWARE
   PUBLICLY AVAILABLE UNDER U.S. EXPORT LAWS AND IS PROVIDED "AS-IS"
   TO THE RECIPIENT WITHOUT WARRANTY OF ANY KIND, INCLUDING ANY
   WARRANTIES OF PERFORMANCE OR MERCHANTABILITY OR FITNESS FOR A
   PARTICULAR USE OR PURPOSE (AS SET FORTH IN UNITED STATES UCC
   SECTIONS 2312-2313) OR FOR ANY PURPOSE WHATSOEVER, FOR THE
   SOFTWARE AND RELATED MATERIALS, HOWEVER USED.

   IN NO EVENT SHALL CALTECH, ITS JET PROPULSION LABORATORY, OR NASA
   BE LIABLE FOR ANY DAMAGES AND/OR COSTS, INCLUDING, BUT NOT
   LIMITED TO, INCIDENTAL OR CONSEQUENTIAL DAMAGES OF ANY KIND,
   INCLUDING ECONOMIC DAMAGE OR INJURY TO PROPERTY AND LOST PROFITS,
   REGARDLESS OF WHETHER CALTECH, JPL, OR NASA BE ADVISED, HAVE
   REASON TO KNOW, OR, IN FACT, SHALL KNOW OF THE POSSIBILITY.

   RECIPIENT BEARS ALL RISK RELATING TO QUALITY AND PERFORMANCE OF
   THE SOFTWARE AND ANY RELATED MATERIALS, AND AGREES TO INDEMNIFY
   CALTECH AND NASA FOR ALL THIRD-PARTY CLAIMS RESULTING FROM THE
   ACTIONS OF RECIPIENT IN THE USE OF THE SOFTWARE.

-Required_Reading
 
   WINDOWS 
 
-Keywords
 
   WINDOWS 
 
*/

   #include "SpiceUsr.h"
   #include "SpiceZfc.h"
   #include "SpiceZmc.h"


   void wnextd_c ( SpiceChar     side,
                   SpiceCell   * window ) 

/*

-Brief_I/O

   VARIABLE  I/O  DESCRIPTION 
   --------  ---  -------------------------------------------------- 
   side       I   Extract left ('L') or right ('R') endpoints. 
   window    I,O  Window to be extracted.  
 
-Detailed_Input
 
   side        indicates whether the left or right endpoints of 
               the intervals in the window are to be extracted. 

                  'L', 'l'       Left endpoints. 
                  'R', 'r'       Right endpoints. 

               If side is not recognized, the input window is 
               not changed. 

   window      on input, is a window containing zero or more intervals.
               window must be declared as a double precision SpiceCell.
 
-Detailed_Output
 
    window      on output, is the collection of singleton intervals 
                containing either the left or the right endpoints 
                of the intervals in the original window. 
 
-Parameters
 
   None. 
 
-Exceptions
 
   1) If the input window does not have double precision type,
      the error SPICE(TYPEMISMATCH) is signaled.

   2) If the endpoint specification side is not recognized, the 
      error SPICE(INVALIDENDPNTSPEC) is signaled. 
 
-Files
 
   None. 

-Particulars
 
   This routine replaces every interval in the input window with 
   the singleton interval containing one of the endpoints of the 
   interval. 
 
-Examples
 
   Let window contain the intervals 

      [ 1, 3 ]  [ 7, 11 ]  [ 23, 27 ]  [ 29, 29 ] 

   Then the call 

      wnextd_c (  'L', &window );

   produces the window 

      [ 1, 1 ]  [ 7, 7 ]  [ 23, 23 ]  [ 29, 29 ] 

   And the call 

      wnextd_c ( 'R', &window );

   produces the window 

      [ 3, 3 ]  [ 11, 11 ]  [ 27, 27 ]  [ 29, 29 ] 
 
-Restrictions
 
   None. 
 
-Literature_References
 
   None. 
 
-Author_and_Institution
 
   N.J. Bachman    (JPL)
   H.A. Neilan     (JPL) 
   W.L. Taber      (JPL) 
   I.M. Underwood  (JPL) 
 
-Version
 
 -CSPICE Version 1.0.0, 29-JUL-2002 (NJB) (HAN) (WLT) (IMU)

-Index_Entries
 
   extract the endpoints from a d.p. window 
 
-&
*/

{ /* Begin wnextd_c */

 
   /*
   Participate in error tracing.
   */
   if ( failed_c() )
   {
      return;
   }
   chkin_c ( "wnextd_c" );


   /*
   Make sure data type is d.p. 
   */
   CELLTYPECHK ( CHK_STANDARD, "wnextd_c", SPICE_DP, window );


   /*
   Initialize the cell if necessary. 
   */
   CELLINIT ( window );


   wnextd_ ( ( char       * ) &side,  
             ( doublereal * ) window->base,
             ( ftnlen       ) 1             );


   /*
   Note:  we don't sync the cell because the size and cardinality
   are unchanged. 
   */

   chkout_c ( "wnextd_c" );

} /* End wnextd_c */
