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 getVarLen()
 Obtain the length of a column (field) value
------------------------------------------------------------------------------
 Prototype

     ERRCODE getVarLen(
                        WORKAREAP wa,
                        USHORT fieldNum,
                        ULONGP length
                      )

 Arguments

     wa is a pointer to self.

     fieldNum specifies the ordinal position of the column whose length
     is to be obtained.

     length is a pointer to an unsigned long that determines the length
     of the field.

 Description

     Retrieves the length of the specified column for use by the CA-Clipper
     Runtime System.

 Default Behavior

     You must implement the default behavior of this method through a
     subclass.

 Implementation Notes

     .  In some cases, getting the length of the column wa->fields[fieldNum]
        may be as simple as assigning wa->fields[fieldNum].len to length.
        In other cases, where columns are of varying length, you  may have to
        perform a physical data read to correctly determine the length of the
        data.

     Warning!  length must point to sizeof(ULONG) bytes of allocated
     memory.

 Files:  Header file is Rdd.api.