Index Page ekccnt_c

A B C D E F G H I J K L M N O P Q R S T U V W X

Procedure Abstract Required_Reading Keywords Brief_I/O Detailed_Input | Detailed_Output Parameters Exceptions Files Particulars Examples | Restrictions Literature_References Author_and_Institution Version Index_Entries

#### Procedure

       void ekccnt_c ( ConstSpiceChar  * table,
                       SpiceInt        * ccount )

#### Abstract

       Return the number of distinct columns in a specified, currently
       loaded table

#### Required_Reading

       EK

#### Keywords

       EK
       FILES
       UTILITY

#### Brief_I/O

       Variable  I/O  Description
       --------  ---  --------------------------------------------------
       table      I   Name of table.
       ccount     O   Count of distinct, currently loaded columns.

#### Detailed_Input

       table          is the name of a currently loaded table.  Case
                      is not significant in the table name.

#### Detailed_Output

       ccount         is the number of distinct columns in table.
                      Columns that have the same name but belong to
                      different segments that are considered to be
                      portions of the same column, if the segments
                      containing those columns belong to table.

#### Parameters

       None.

#### Exceptions

       1) If the specified table is not loaded, the error
          SPICE(TABLENOTLOADED) is signaled.

       2) If the input string pointer is null, the error
          SPICE(NULLPOINTER) will be signaled.

       3) If the input string has length zero, the error
          SPICE(EMPTYSTRING) will be signaled.

#### Files

       This routine reads binary "sequence component" EK files.
       In order for a binary EK file to be accessible to this routine,
       the file must be loaded via a call to furnsh_c or the low-level
       EK loader eklef_c.

#### Particulars

       This routine is a utility intended for use in conjunction with
       the entry point ekcii_c.  These routines can be used to find the
       names and attributes of the columns that are currently loaded.

#### Examples

       1)  Dump the names and attributes of the columns in each loaded
           table.  ekccnt_c is used to obtain column counts.

              #include "SpiceUsr.h"
              #include "SpiceEK.h"

              #define FILEN           256

              SpiceChar               colnam  [ SPICE_EK_CSTRLN ];
              SpiceChar               ek      [ FILEN ];
              SpiceChar               tabnam  [ SPICE_EK_TSTRLN ];

              SpiceChar             * typstrs [ 4 ] =
                                      {
                                         "CHR", "DP", "INT", "TIME"
                                      };

              SpiceEKAttDsc           attdsc;

              SpiceInt                i;
              SpiceInt                ncols;
              SpiceInt                ntab;
              SpiceInt                tab;

              prompt_c ( "Enter name of EK to examine > ", FILEN, ek );

              furnsh_c ( ek );

              /.
              Get the number of loaded tables.
              ./
              ekntab_c ( &ntab );

              for ( tab = 0;  tab < ntab;  tab++ )
              {
                 /.
                 Get the name of the current table, and look up
                 the column count for this table.
                 ./
                 ektnam_c ( tab, SPICE_EK_TSTRLN, tabnam );

                 ekccnt_c ( tabnam, &ncols );

                 printf ( "Table = %s\n\n", tabnam );

                 /.
                 For each column in the current table, look up the
                 column's attributes.  The attribute block
                 index parameters are defined in the include file
                 ekattdsc.inc.
                 ./

                 for ( i = 0;  i < ncols;  i++ )
                 {
                    ekcii_c ( tabnam, i, SPICE_EK_CSTRLN, colnam, &attdsc );

                    printf ( "Column = %s\n", colnam );

                    /.
                    Write out the current column's data type.
                    ./

                    printf ( "Type = %s\n", typstrs[(int)attdsc.dtype] );

                    if ( attdsc.dtype == SPICE_CHR )
                    {
                       if ( attdsc.strlen == SPICE_EK_VARSIZ )
                       {
                          printf ( "String length = VARIABLE\n" );
                       }
                       else
                       {
                           printf ( "String length = %d\n",
                                   (int) attdsc.strlen );
                       }
                    }

                    /.
                    Write out the current column's entry size.
                    ./
                    printf ( "Size = %d\n", (int)attdsc.size );

                    /.
                    Indicate whether the current column is indexed.
                    ./
                    if ( attdsc.indexd == SPICETRUE )
                    {
                       printf ( "Indexed.\n" );
                    }
                    else
                    {
                       printf ( "Not indexed.\n" );
                    }

                    /.
                    Indicate whether the current column allows
                    null values.
                    ./
                    if ( attdsc.nullok == SPICETRUE )
                    {
                       printf ( "Null values allowed.\n" );
                    }
                    else
                    {
                       printf ( "Null values not allowed.\n" );
                    }
                 }
                 /.
                 We're done with the current column.
                 ./
              }
              /.
              We're done with the current table.
              ./

#### Restrictions

       None.

#### Literature_References

       None.

#### Author_and_Institution

       N.J. Bachman   (JPL)

#### Version

       -CSPICE Version 1.0.1, 12-JUL-2016 (EDW)

          Edit to example program to use "%d" with explicit casts
          to int for printing SpiceInts with printf.

       -CSPICE Version 1.0.0, 14-OCT-2001 (NJB)

#### Index_Entries

       return the number of loaded EK columns
       return the count of loaded EK columns

#### Link to routine ekccnt_c source file ekccnt_c.c

    Wed Apr  5 17:54:33 2017