c
      function lenstr(str)
      character*(*) str
c
c Return index to last non-blank char in str
c
      length = len(str)
      do i=length,1,-1
        if (str(i:i).ne.' ') then
          lenstr = i
          return
        endif
      enddo
      lenstr = 0
      return
      end
c
      subroutine clearstr(str)
c 
c Set given string to all blanks 
c 
      character*(*) str
      length = len(str)
      do i=1,length
        str(i:i) = ' '
      enddo
      return
      end
c