C-----------------------------------------------------------------------
C;  Copyright (C) 1995
C;  Associated Universities, Inc. Washington DC, USA.
C;
C;  This program is free software; you can redistribute it and/or
C;  modify it under the terms of the GNU General Public License as
C;  published by the Free Software Foundation; either version 2 of
C;  the License, or (at your option) any later version.
C;
C;  This program is distributed in the hope that it will be useful,
C;  but WITHOUT ANY WARRANTY; without even the implied warranty of
C;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
C;  GNU General Public License for more details.
C;
C;  You should have received a copy of the GNU General Public
C;  License along with this program; if not, write to the Free
C;  Software Foundation, Inc., 675 Massachusetts Ave, Cambridge,
C;  MA 02139, USA.
C
C   For further information about this software contact:
C         Internet email: bcotton@nrao.edu.
C         Postal address: Bill Cotton
C                         National Radio Astronomy Observatory
C                         520 Edgemont Road
C                         Charlottesville, VA 22903-2475 USA
C-----------------------------------------------------------------------
      SUBROUTINE TXOPN (UNIT, FILNAM, IERR)
C-----------------------------------------------------------------------
C   Open a text file for read
C   Translated from the AIPSish
C   Inputs:
C      UNIT     I      Logical unit number
C      FILNAM   C*(*)  File name
C   Outputs:
C      IERR     I      Error return code: 0 => no error
C                      1 = File does not exist
C                      2 = Error opening
C-----------------------------------------------------------------------
      CHARACTER FILNAM*(*)
      INTEGER   UNIT, IERR
C
      LOGICAL   EXISTS
C-----------------------------------------------------------------------
      IERR = 0
C                                       See if file exists
      INQUIRE (FILE=FILNAM, EXIST=EXISTS)
      IF (.NOT.EXISTS) THEN
         IERR = 1
         GO TO 999
         END IF
C                                       Open
C      OPEN (UNIT=UNIT, FILE=FILNAM, READONLY, ERR=900)
C                                       solaris f77 ver SC4.0
C      OPEN (UNIT=UNIT, FILE=FILNAM, ACTION='read', ERR=900)
C                                       For systems without READONLY
      OPEN (UNIT=UNIT, FILE=FILNAM, ERR=900)
      GO TO 999
C                                       Open error
 900  IERR = 2
C
 999  RETURN
      END
      SUBROUTINE TXCLS (UNIT, IERR)
C-----------------------------------------------------------------------
C   Close the text file associated with UNIT.
C   Inputs:
C      UNIT   I   Logical unit number
C   Output:
C      IERR   I   Error return code: 0 => no error
C                    1 => close error
C-----------------------------------------------------------------------
      INTEGER   UNIT, IERR
C-----------------------------------------------------------------------
      IERR = 0
C                                       Close the text file.
      CLOSE (UNIT=UNIT, ERR=900)
      GO TO 999
C                                       Error
 900  IERR = 1
C
 999   RETURN
      END
      SUBROUTINE TXREAD (UNIT, LINE, IERR)
C-----------------------------------------------------------------------
C   Read/write the next sequential line from/to a  text file.
C   Inputs:
C      UNIT   I       Logical unit number
C      LINE   C*(*)   Line of text.
C   Output:
C      LINE   C*(*)   Line of text.
C      IERR   I       Error return code: 0 => no error
C                     -1 = EOF, 1 = read error
C-----------------------------------------------------------------------
      CHARACTER LINE*(*)
      INTEGER   UNIT, IERR
C
C-----------------------------------------------------------------------
      IERR = 0
C                                       Read
      READ (UNIT, 1000, END=800, ERR=900) LINE
      GO TO 999
C                                       End of file.
 800  IERR = -1
      LINE = '    '
      GO TO 999
C                                       Other error.
 900  IERR = 1
      LINE = '    '
      GO TO 999
C
 999  RETURN
C-----------------------------------------------------------------------
 1000 FORMAT (A)
      END