Procedure

   spkuds_c ( SPK - unpack segment descriptor ) 

   void spkuds_c ( ConstSpiceDouble     descr [5],
                   SpiceInt           * body,
                   SpiceInt           * center,
                   SpiceInt           * frame,
                   SpiceInt           * type,
                   SpiceDouble        * first,
                   SpiceDouble        * last,
                   SpiceInt           * baddrs,
                   SpiceInt           * eaddrs     )

Abstract

   Unpack the contents of an SPK segment descriptor.

Required_Reading

   SPK

Keywords

   SPK

Brief_I/O

   VARIABLE  I/O  DESCRIPTION
   --------  ---  --------------------------------------------------
   descr      I   An SPK segment descriptor.
   body       O   The NAIF ID code for the body of the segment.
   center     O   The center of motion for `body'.
   frame      O   The code for the frame of this segment.
   type       O   The type of SPK segment.
   first      O   The first epoch for which the segment is valid.
   last       O   The last  epoch for which the segment is valid.
   baddrs     O   Beginning DAF address of the segment.
   eaddrs     O   Ending DAF address of the segment.

Detailed_Input

   descr       is an SPK segment descriptor.

Detailed_Output

   body        is the NAIF ID code for the body of the segment.

   center      is the center of motion for `body'.

   frame       is the SPICE integer code for the frame to which states
               for the body are be referenced.

   type        is the type of SPK segment.

   first       is the first epoch for which the segment has
               ephemeris data.

   last        is the last epoch for which the segment has
               ephemeris data.

   baddrs      is the starting address of the data associated
               with this descriptor.

   eaddrs      is the last address of the data associated with
               this descriptor.

Parameters

   None.

Exceptions

   Error free.

   1)  If the input descriptor `descr' is invalid, it's possible for
       the output times to contain bit patterns that don't represent
       normal double precision values. This error is not diagnosed.

Files

   None.

Particulars

   This routine extracts the contents of an SPK segment
   descriptor into the components needed for reading and
   evaluating the data stored in the segment. It serves
   as a macro for expanding the SPK segment descriptor.

Examples

   Suppose you wished to summarize a particular SPK segment
   and that you have the descriptor for that segment in hand.
   The following code fragment shows how you might use this
   routine to create a summary message concerning the segment.

       #include <stdio.h>
       #include "SpiceUsr.h"

       #define   TIMLEN       35
             .
             .
             .

       spkuds_c ( descr,  &body, &center, &frame,
                  &type,  &first, &last,  &baddr, &eaddr );

       /.
       Convert the start and stop times to TDB calendar strings.
       ./
       etcal_c ( first, TIMLEN, fstcal );
       etcal_c ( last,  TIMLEN, lstcal );

       printf ( "\n"
                "Body     : %d\n"
                "Center   : %d\n"
                "Frame ID : %d\n"
                "Data Type: %d\n"
                "\n"
                "Segment Start :  %s\n"
                "Segment Stop  :  %s\n",
                body,
                center,
                frame,
                type,
                fstcal,
                lstcal                   );

Restrictions

   None.

Literature_References

   None.

Author_and_Institution

   N.J. Bachman        (JPL)
   J. Diaz del Rio     (ODC Space)
   K.R. Gehringer      (JPL)
   W.L. Taber          (JPL)

Version

   -CSPICE Version 1.2.0, 17-JUN-2021 (JDR)

       Changed the output argument names "begin" and "end" to "baddrs" and
       "eaddrs" for consistency with other routines.

       Edited the header to comply with NAIF standard. Added -Exceptions
       section.

   -CSPICE Version 1.1.0, 24-JUL-2001 (NJB)

       Changed prototype: input descr is now type (ConstSpiceDouble *).
       Implemented interface macro for casting input descr to const.

   -CSPICE Version 1.0.0, 22-JUL-1999 (NJB) (WLT) (KRG)

Index_Entries

   Unpack and SPK segment descriptor