Open an existing E-kernel file for reading. 

   EK 

   Variable  I/O  Description 
   --------  ---  -------------------------------------------------- 
   fname      I   Name of EK file. 
   handle     O   Handle attached to EK file. 

   fname          is the name of an existing E-kernel file to be 
                  opened for read access. 

   handle         is the EK file handle of the file designated by 
                  fname.  This handle is used to identify the file 
                  to other EK routines. 

   None. 

   This routine should be used to open an EK file for read access. 
   EKs opened for read access may not be modified. 

   Opening an EK file with this routine makes the EK accessible to 
   the CSPICE EK readers 

      ekrcec_c
      ekrced_c
      ekrcei_c

   all of which expect an EK file handle as an input argument.  These 
   readers allow a caller to read individual EK column entries. 

   To make an EK available to the EK query system, the file must be 
   loaded via eklef_c, rather than by this routine.  See the EK 
   Required Reading for further information. 

   1)  Open the file my.ek for read access: 

          ekopr_c ( "my.ek", &handle );

   1)  No more than CSPICE_EK_MAX_OPEN_FILES EK files may be opened
       or loaded within the EK system simultaneously.  See the header
       file SpicePar.h for the numeric value of the limit.

   1)  If the indicated file cannot be opened, the error will be 
       diagnosed by routines called by this routine.  The new file 
       will be deleted. 

   2)  If the indicated file has the wrong architecture version, the 
       error will be diagnosed by routines called by this routine. 

   3)  If an I/O error occurs while reading the indicated file, the 
       error will be diagnosed by routines called by this routine. 

   See the EK Required Reading for a discussion of the EK file 
   format. 

   N.J. Bachman   (JPL) 

   None. 

   -CSPICE Version 1.1.0, 23-JUL-2001 (NJB)

       Removed tab characters from source file.

   -CSPICE Version 1.0.0, 27-MAR-1998

       Based on SPICELIB Version 1.0.0, 26-AUG-1995 (NJB)

   open EK for reading