split_string_by_space Subroutine

  subroutine split_string_by_space (string_in, length_mx, &
       mxseg, nseg, str_piece, jstatus)
    integer,           intent (in) :: length_mx
    character (len=length_mx), intent (in) :: string_in
    integer,           intent (in) :: mxseg
    integer,           intent (out):: nseg
    character (len=length_mx), intent (out):: str_piece(mxseg)
    integer,           intent (out):: jstatus
    character (len=length_mx) :: string
    character (len=1) :: mark
    integer :: ios
    integer :: wc
    !
    !  "xxxx  yy zz   uu   vv"
    !
    ! split by space ''
    mark=' '
    wc=0
    ios=0
    string = trim( adjustl(string_in) )
    do while (ios==0)
       i = index (string, mark)
       !!print*, 'index=', i
       if (i > 1) then
          wc = wc + 1
          str_piece(wc)=trim(adjustl(string(1:i)))
          !!write(6,*) 'str_piece(wc)=', trim(str_piece(wc))
          string = trim(adjustl(string(i:)))
       else
          ios=1
       end if
       if (LEN_TRIM(adjustl(string)) == 0) ios=1
    end do
    nseg=wc
    return
  end subroutine split_string_by_space