Function:      GDS_EXIST

Purpose:       Test whether set exists.

Category:      GDS

File:          gdsd_basic.c

Author:        J.P. Terlouw

Use:           GDS_EXIST (                 Return value, LOGICAL
                           SETNAME,        Input, CHARACTER
                           ERROR)          Output, INTEGER

                  SETNAME   Name of set.
                  ERROR     Error return code.

Description:   .TRUE. is returned if the set exists; .FALSE. otherwise.
               This routine can return .FALSE. though the descriptor file
               does exist. This can happen when the descriptor file is 
               corrupt or has an incompatible version number. Such a condition
               is reported through the ERROR argument.

Updates:      25-May-87   original document
              14-Nov-89   rewritten in C
              05-Dec-91   check on file contents added
              09-Mar-94   rewritten for GDS server