Procedure

   void ekdelr_c ( SpiceInt   handle,
                   SpiceInt   segno,
                   SpiceInt   recno ) 

Abstract

 
   Delete a specified record from a specified E-kernel segment. 
 

Required_Reading

 
   EK 
 

Keywords

 
   EK
   UTILITY 
 

Brief_I/O

 
   Variable  I/O  Description 
   --------  ---  -------------------------------------------------- 
   handle     I   File handle. 
   segno      I   Segment number. 
   recno      I   Record number. 
 

Detailed_Input

 
   handle         is a file handle of an EK open for write access. 
 
   segno          is the number of the segment to which the record 
                  is to be added.  EK segment numbers range from
                  zero to N-1, where N is the number of segments
                  in the kernel.
 
   recno          is the index of the record to delete.  recno must 
                  be in the range 0 : N, where N is the 
                  number of records in the segment prior to the 
                  insertion. 
 

Detailed_Output

 
   None.  See the $Particulars section for a description of the 
   effect of this routine. 
 

Parameters

 
   None. 
 

Exceptions

 
   1)  If handle is invalid, the error will be diagnosed by routines 
       called by this routine.  The file will not be modified. 
 
   2)  If segno is out of range, the error SPICE(INVALIDINDEX) 
       will be signalled.  The file will not be modified. 
 
   3)  If recno is out of range, the error SPICE(INVALIDINDEX) 
       will be signalled.  The file will not be modified. 
 
   4)  If an I/O error occurs while reading or writing the indicated 
       file, the error will be diagnosed by routines called by this 
       routine.  The file may be corrupted. 
 

Files

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

Particulars

 
   This routine operates by side effects:  it deletes a record 
   from an EK segment.  Deleting a record implies: 
 
      1) All column entries in the record are deleted. 
 
      2) Link counts are decremented for data pages containing 
         column entries in the record to be deleted.  Pages whose 
         link counts drop to zero are freed. 
 
      3) All column indexes are updated for the parent segment. 
 
      4) The link count is decremented for the page containing the 
         record pointer structure of the record to be deleted.  If 
         the link count drops to zero, the page is freed. 
 
      5) The pointer to the deleted record is deleted from the 
         record tree for the parent segment. 
 
      6) The segment's metadata is updated to reflect the new 
         record count. 
 

Examples

 
   1)  Suppose the second segment of an EK file designated by 
       handle contains 5 records: 
 
          +-----------------+ 
          |     Record 0    | 
          +-----------------+ 
          |     Record 1    | 
          +-----------------+ 
          |     Record 2    | 
          +-----------------+ 
          |     Record 3    | 
          +-----------------+ 
          |     Record 4    | 
          +-----------------+ 
 
       Then the call 
 
          ekdelr_c ( handle, 1, 2 ) 
 
       deletes the third record from the segment, leaving the 
       segment's contents as follows: 
 
          +-----------------+ 
          |     Record 0    | 
          +-----------------+ 
          |     Record 1    | 
          +-----------------+ 
          |     Record 3    | 
          +-----------------+ 
          |     Record 4    | 
          +-----------------+ 
 

Restrictions

 
   None. 
 

Literature_References

 
   None. 
 

Author_and_Institution

 
   N.J. Bachman   (JPL) 
 

Version

 
   -CSPICE Version 1.0.0, 16-JUN-2000 (NJB)

Index_Entries

 
   delete record from an EK segment 
 

Link to routine ekdelr_c source file ekdelr_c.c