text: /*
  
  -Procedure unload_c ( Unload a kernel )
  
  -Abstract
  
     Unload a SPICE kernel.
  
  -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
  
     None.
  
  -Keywords
  
     KERNEL
  
  */
  
     #include "SpiceUsr.h"
     #include "SpiceZfc.h"
     #include "SpiceZmc.h"
  
  
     void unload_c ( ConstSpiceChar  * file )
  
  /*
  
  -Brief_I/O
  
     VARIABLE  I/O  DESCRIPTION
     --------  ---  --------------------------------------------------
     file       I   The name of a kernel to unload.
  
  -Detailed_Input
  
     file        is the name of a file to unload. This file
                 should be one loaded through the interface furnsh_c.
                 If the file is not on the list of loaded kernels
                 no action is taken.
  
                 Note that if file is a meta-text kernel, all of
                 the files loaded as a result of loading the meta-text
                 kernel will be unloaded.
  
  -Detailed_Output
  
     None.
  
  -Parameters
  
     None.
  
  -Exceptions
  
     1)  If the specified kernel is not on the list of loaded kernels
         no action is taken.
  
     2)  If the `file' input string pointer is null, the error
         SPICE(NULLPOINTER) is signaled.
  
     3)  If the `file' input string has zero length, the error
         SPICE(EMPTYSTRING) is signaled.
  
  -Files
  
     None.
  
  -Particulars
  
     The call
  
        unload_c ( file );
  
     has the effect of "erasing" the last previous call:
  
        furnsh_c ( file );
  
     This interface allows you to unload binary and text kernels.
     Moreover, if you used a meta-text kernel to set up your
     working environment, you can unload all of the kernels loaded
     through the meta-kernel by unloading the meta-kernel.
  
  
     Unloading Text Kernels or Meta-Kernels
     --------------------------------------
  
     Part of the action of unloading text (or meta-text kernels) is
     clearing the kernel pool and re-loading any kernels that were not in
     the specified set of kernels to unload. Since loading of text
     kernels is not a very fast process, unloading text kernels takes
     considerably longer than unloading binary kernels. Moreover, since
     the kernel pool is cleared, any kernel pool variables you have set
     from your program by using one of the interfaces pcpool_c, pdpool_c,
     pipool_c, or lmpool_c will be removed from the kernel pool. For
     this reason, if you plan to use this feature in your program,
     together with one of the routines specified above, you will need to
     take special precautions to make sure kernel pool variables required
     by your program do not inadvertently disappear.
  
  -Examples
  
     The numerical results shown for this example may differ across
     platforms. The results depend on the SPICE kernels used as
     input, the compiler and supporting libraries, and the machine
     specific arithmetic implementation.
  
     1) Load a meta-kernel with a PCK, an LSK and an SPK, and
        separately, a text kernel and a binary PCK. Loop over the
        loaded kernels, outputting file information for each of
        them.
  
        Then unload the text kernels, check that they have been
        unloaded, and finally unload the meta-kernel.
  
  
        Use the meta-kernel shown below to load the required SPICE
        kernels.
  
  
           KPL/MK
  
           File name: unload_ex1.tm
  
           This meta-kernel is intended to support operation of SPICE
           example programs. The kernels shown here should not be
           assumed to contain adequate or correct versions of data
           required by SPICE-based user applications.
  
           In order for an application to use this meta-kernel, the
           kernels referenced here must be present in the user's
           current working directory.
  
           The names and contents of the kernels referenced
           by this meta-kernel are as follows:
  
              File name                     Contents
              ---------                     --------
              de421.bsp                     Planetary ephemeris
              pck00009.tpc                  Planet orientation and
                                            radii
              naif0012.tls                  Leapseconds
  
           \begindata
  
              KERNELS_TO_LOAD = ( 'de421.bsp',
                                  'naif0012.tls',
                                  'pck00009.tpc' )
  
           \begintext
  
           End of meta-kernel
  
  
        Use the PCK kernel below as the binary PCK required for the
        example.
  
           earth_latest_high_prec.bpc
  
  
        Use the FK kernel below as the text kernel required for the
        example.
  
           RSSD0002.TF
  
  
        Example code begins here.
  
  
        /.
           Program unload_ex1
        ./
        #include <stdio.h>
        #include "SpiceUsr.h"
  
        int main( )
        {
  
           /.
           Local constants.
           ./
           #define FNAMLN       256
           #define FTYPLN       33
           #define SRCLEN       256
  
           /.
           Local variables.
           ./
           SpiceChar            file   [FNAMLN];
           SpiceChar            filtyp [FTYPLN];
           SpiceChar            srcfil [SRCLEN];
  
           SpiceInt             count;
           SpiceInt             handle;
  
           SpiceBoolean         found;
  
           /.
           Load several kernel files.
           ./
           furnsh_c ( "unload_ex1.tm"              );
           furnsh_c ( "RSSD0002.TF"                );
           furnsh_c ( "earth_latest_high_prec.bpc" );
  
           /.
           Count the number of loaded kernel files.
           ./
           ktotal_c ( "ALL", &count );
  
           printf( "The total number of kernels after final furnsh_c:  %1d\n",
                                                                       count );
           printf( "\n" );
  
           /.
           Unload the text kernels.
           ./
           ktotal_c ( "TEXT", &count );
  
           printf( "\n" );
           printf( "Unloading %1d text kernels...\n", count );
           printf( "\n" );
  
           while ( count > 0 )
           {
  
              kdata_c ( 0,    "TEXT", FNAMLN,  FTYPLN,  SRCLEN,
                        file, filtyp, srcfil, &handle, &found  );
  
              /.
              If the kernel is found in the pool, unload it.
              ./
              if ( found )
              {
  
                 unload_c ( file );
  
                 /.
                 Check if the file has been unloaded.
                 ./
                 kinfo_c ( file,    FTYPLN,  SRCLEN, filtyp,
                           srcfil, &handle, &found          );
  
                 if ( found )
                 {
                    printf( "  Error"  );
                 }
                 else
                 {
                    printf( "  Success" );
                 }
  
                 printf( " unloading %s\n", file );
  
              }
  
              /.
              Something is not working. Inform NAIF.
              ./
              else
              {
                 printf( " ERROR: No kernel found but ktotal_c returns %d\n",
                                                                       count );
              }
  
              /.
              Check if we have more text kernels to unload from
              the kernel pool. Note that unloading a text kernel
              or meta-kernel implies that the kernel pool is
              cleared, and any kernel[s - 1] that were not to be
              unloaded are re-loaded. Therefore the `count' value
              changes, and the indexing of the files within the
              kernel pool too.
              ./
              ktotal_c ( "TEXT", &count );
  
           }
  
           ktotal_c ( "ALL", &count );
  
           printf( " \n" );
           printf( "The total number of kernels after unload_c calls:  %1d\n",
                                                                       count );
  
           /.
           Clear the KEEPER system, retrieve the number of loaded
           after the clear.
           ./
           unload_c ( "unload_ex1.tm" );
  
           ktotal_c ( "ALL", &count );
  
           printf( " \n" );
           printf( "The total number of kernels after final unload_c:  %1d\n",
                                                                       count );
  
           return ( 0 );
        }
  
  
        When this program was executed on a Mac/Intel/cc/64-bit
        platform, the output was:
  
  
        The total number of kernels after final furnsh_c:  6
  
  
        Unloading 3 text kernels...
  
          Success unloading naif0012.tls
          Success unloading pck00009.tpc
          Success unloading RSSD0002.TF
  
        The total number of kernels after unload_c calls:  3
  
        The total number of kernels after final unload_c:  1
  
  
  -Restrictions
  
     1)  See the note regarding the unloading of text and meta-text
         kernels.
  
  -Literature_References
  
     None.
  
  -Author_and_Institution
  
     N.J. Bachman        (JPL)
     J. Diaz del Rio     (ODC Space)
     W.L. Taber          (JPL)
  
  -Version
  
     -CSPICE Version 1.0.1, 03-AUG-2021 (JDR)
  
         Edited the header to comply with NAIF standard.
         Created complete code example from existing code fragments.
  
         Re-ordered header sections.
  
     -CSPICE Version 1.0.0, 01-SEP-1999 (NJB) (WLT)
  
  -Index_Entries
  
     Unload a SPICE kernel
  
  -&
  */
  
  { /* Begin unload_c */
  
  
  
     /*
     Participate in error tracing.
     */
  
     chkin_c ( "unload_c" );
  
  
     /*
     Check the input filename to make sure the pointer is non-null
     and the string length is non-zero.
     */
     CHKFSTR ( CHK_STANDARD, "unload_c", file );
  
  
     /*
     Call the f2c'd Fortran routine.
     */
     unload_ ( ( char   * ) file,
               ( ftnlen   ) strlen(file) );
  
  
     chkout_c ( "unload_c" );
  
  } /* End unload_c */
  