ESMF_StateWrite Subroutine

      subroutine ESMF_StateWrite(state, fileName, rc)
!
! !ARGUMENTS:
      type(ESMF_State),  intent(in)            :: state 
      character (len=*), intent(in)            :: fileName
      integer,           intent(out), optional :: rc 
!
! !DESCRIPTION:
!     Currently limited to write out all Arrays of a State object to a
!     netCDF file.  Future releases will enable more item types of a State to
!     be written to files of various formats.
!
!     Writing is currently limited to PET 0; future versions of ESMF will allow
!     parallel writing, as well as parallel reading.
!
!     See Section~\ref{example:StateRdWr} for an example.
!
!     Note that the third party NetCDF library must be installed.  For more
!     details, see the "ESMF Users Guide",
!     "Building and Installing the ESMF, Third Party Libraries, NetCDF" and
!     the website http://www.unidata.ucar.edu/software/netcdf.
!
!     The arguments are:
!     \begin{description}
!     \item[state]
!       The {\tt ESMF\_State} from which to write items.  Currently limited to
!       Arrays.
!     \item[fileName]
!       File to be written.  
!     \item[{[rc]}]
!       Return code; equals {\tt ESMF\_SUCCESS} if there are no errors.
!       Equals {\tt ESMF\_RC\_LIB\_NOT\_PRESENT} if the NetCDF library is
!       not present.
!     \end{description}
!
!EOP
!       TODO: use item flag ESMF_STATEITEM_ARRAY<BUNDLE>

        integer :: localrc

        ! Initialize return code; assume failure until success is certain
        if (present(rc)) rc = ESMF_RC_NOT_IMPL
        localrc = ESMF_RC_NOT_IMPL

        ! check input variables
        ESMF_INIT_CHECK_DEEP(ESMF_StateGetInit,state,rc)

        if (fileName == ' ') then
          if (ESMF_LogFoundError (ESMF_RC_ARG_VALUE, msg='File name required',  &
              ESMF_CONTEXT, rcToReturn=rc)) return
        end if

        ! invoke C to C++ entry point 
        call c_ESMC_StateWrite(state, state%statep%base, trim (fileName), localrc)
        if (ESMF_LogFoundError(localrc, ESMF_ERR_PASSTHRU, &
            ESMF_CONTEXT, rcToReturn=rc)) return

        if (present(rc)) rc = ESMF_SUCCESS
        end subroutine ESMF_StateWrite