!
!     CalculiX - A 3-dimensional finite element program
!              Copyright (C) 1998-2011 Guido Dhondt
!
!     This program 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(version 2);
!     
!
!     This program 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 this program; if not, write to the Free Software
!     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
!
      subroutine identifytiedface(tieset,ntie,set,nset,ifaceslave)
!
!     identifies slave nodes in tied slave faces
!
      implicit none
!
      character*81 tieset(3,*),slavset,set(*)
!
      integer ifaceslave(*),i,j,nset,ipos,ntie
!
!     nodes per face for tet elements
!
      do i=1,ntie
         if(tieset(1,i)(81:81).ne.'T') cycle
         slavset=tieset(2,i)
         ipos=index(slavset,' ')
         slavset(ipos:ipos)='T'
         do j=1,nset
            if(set(j).eq.slavset) exit
         enddo
         if(j.gt.nset) then
            slavset(ipos:ipos)='S'
            do j=1,nset
               if(set(j).eq.slavset) then
                  exit
               endif
            enddo
            if(j.gt.nset) then
               write(*,*) 
     &           '*ERROR in identifytiedface: ',
     &           'tied contact nodal slave surface',
     &              slavset
               write(*,*) '       does not exist'
               stop
            else
               tieset(2,i)(ipos:ipos)='S'
               ifaceslave(i)=0
            endif
         else
            tieset(2,i)(ipos:ipos)='T'
            ifaceslave(i)=1
         endif
      enddo
      return
      end

