SUBROUTINE user_parin

!--------------------------------------------------------------------------------!
! This file is part of PALM.
!
! PALM is free software: you can redistribute it and/or modify it under the terms
! of the GNU General Public License as published by the Free Software Foundation,
! either version 3 of the License, or (at your option) any later version.
!
! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
!
! You should have received a copy of the GNU General Public License along with
! PALM. If not, see <http://www.gnu.org/licenses/>.
!
! Copyright 1997-2014 Leibniz Universitaet Hannover
!--------------------------------------------------------------------------------!
!
! Current revisions:
! -----------------
!
!
! Former revisions:
! -----------------
! $Id: user_parin.f90 1321 2014-03-20 09:40:40Z witha $
!
! 1320 2014-03-20 08:40:49Z raasch
! kind-parameters added to all INTEGER and REAL declaration statements, 
! kinds are defined in new module kinds, 
! old module precision_kind is removed,
! revision history before 2012 removed,
! comment fields (!:) to be used for variable explanations added to
! all variable declaration statements 
!
! 1036 2012-10-22 13:43:42Z raasch
! code put under GPL (PALM 3.9)
!
! 931 2012-06-08 15:09:28Z maronga
! Re-enabled check for max_pr_user
!
! 841 2012-02-28 12:29:49Z maronga
! Bugfix: disable max_pr_user check during prior namelist file check
!
! 217 2008-12-09 18:00:48Z letzel
! +topography_grid_convention
! Former file user_interface.f90 split into one file per subroutine
!
! Description:
! ------------
! Interface to read user-defined namelist-parameters.
!------------------------------------------------------------------------------!

    USE control_parameters
    
    USE kinds
    
    USE pegrid
    
    USE statistics
    
    USE user

    IMPLICIT NONE

    CHARACTER (LEN=80) ::  zeile   !: 

    INTEGER(iwp) ::  i                 !: 
    INTEGER(iwp) ::  j                 !: 
    INTEGER(iwp) ::  max_pr_user_tmp   !: 


    NAMELIST /userpar/  data_output_pr_user, data_output_user, region,         &
                        data_output_masks_user

!
!-- Position the namelist-file at the beginning (it was already opened in
!-- parin), search for user-defined namelist-group ("userpar", but any other
!-- name can be choosed) and position the file at this line.
    REWIND ( 11 )

    zeile = ' '
    DO   WHILE ( INDEX( zeile, '&userpar' ) == 0 )
       READ ( 11, '(A)', END=100 )  zeile
    ENDDO
    BACKSPACE ( 11 )

!
!-- Read user-defined namelist
    READ ( 11, userpar )
    user_defined_namelist_found = .TRUE.

!
!-- Determine the number of user-defined profiles and append them to the
!-- standard data output (data_output_pr)
    max_pr_user_tmp = 0
    IF ( data_output_pr_user(1) /= ' ' )  THEN
       i = 1
       DO  WHILE ( data_output_pr(i) /= ' '  .AND.  i <= 100 )
          i = i + 1
       ENDDO
       j = 1
       DO  WHILE ( data_output_pr_user(j) /= ' '  .AND.  j <= 100 )
          data_output_pr(i) = data_output_pr_user(j)
          max_pr_user_tmp   = max_pr_user_tmp + 1
          i = i + 1
          j = j + 1
       ENDDO
    ENDIF

!
!-- In case of a restart run, the number of user-defined profiles on the
!-- restart file (already stored in max_pr_user) has to match the one given
!-- for the current run
    IF ( TRIM( initializing_actions ) == 'read_restart_data' )  THEN
       IF ( max_pr_user /= max_pr_user_tmp )  THEN
          WRITE( message_string, * ) 'the number of user-defined profiles ',   &
                     'given in &data_output_pr (', max_pr_user_tmp, ') doe',   &
                     'snot match the one ',                                    &
                     '&found in the restart file (', max_pr_user,              &
                                     ')'
          CALL message( 'user_parin', 'UI0009', 1, 2, 0, 6, 0 )
       ENDIF
    ELSE
       max_pr_user = max_pr_user_tmp
    ENDIF

100 RETURN

 END SUBROUTINE user_parin