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  Routine:      CBL_TOUPPER
 
  Function:     Converts a string of letters to upper case.
 
  Syntax:       CALL "CBL_TOUPPER"     USING     string
                                       BY VALUE  length
                                       RETURNING status-code
 
  Parameters:   string                 PIC X(n).
                length                 PIC X(4) COMP-5.
                status-code            See ◄Key►
                                    -♦-