!   -*- Mode: Fortran; -*-
!
!   (C) 2014 by Argonne National Laboratory.
!   See COPYRIGHT in top-level directory.
!
subroutine MPI_File_read_f08ts(fh, buf, count, datatype, status, ierror)
    use, intrinsic :: iso_c_binding, only : c_loc, c_associated
    use, intrinsic :: iso_c_binding, only : c_int, c_ptr
    use :: mpi_f08, only : MPI_File, MPI_Datatype, MPI_Status
    use :: mpi_f08, only : MPI_STATUS_IGNORE, MPIR_C_MPI_STATUS_IGNORE, assignment(=)
    use :: mpi_f08, only : MPI_File_f2c, MPI_File_c2f
    use :: mpi_c_interface, only : c_File, c_Datatype
    use :: mpi_c_interface, only : c_Status
    use :: mpi_c_interface, only : MPIR_File_read_cdesc

    implicit none

    type(MPI_File), intent(in) :: fh
    type(*), dimension(..) :: buf
    integer, intent(in) :: count
    type(MPI_Datatype), intent(in) :: datatype
    type(MPI_Status), target :: status
    integer, optional, intent(out) :: ierror

    integer(c_File) :: fh_c
    integer(c_int) :: count_c
    integer(c_Datatype) :: datatype_c
    type(c_Status), target :: status_c
    integer(c_int) :: ierror_c

    fh_c = MPI_File_f2c(fh%MPI_VAL)
    if (c_int == kind(0)) then
        if (c_associated(c_loc(status), c_loc(MPI_STATUS_IGNORE))) then
            ierror_c = MPIR_File_read_cdesc(fh_c, buf, count, datatype%MPI_VAL, MPIR_C_MPI_STATUS_IGNORE)
        else
            ierror_c = MPIR_File_read_cdesc(fh_c, buf, count, datatype%MPI_VAL, c_loc(status))
        end if
    else
        count_c = count
        datatype_c = datatype%MPI_VAL
        if (c_associated(c_loc(status), c_loc(MPI_STATUS_IGNORE))) then
            ierror_c = MPIR_File_read_cdesc(fh_c, buf, count_c, datatype_c, MPIR_C_MPI_STATUS_IGNORE)
        else
            ierror_c = MPIR_File_read_cdesc(fh_c, buf, count_c, datatype_c, c_loc(status_c))
            status = status_c
        end if
    end if

    if (present(ierror)) ierror = ierror_c

end subroutine MPI_File_read_f08ts
