path: root/fortran/test/tH5P_F03.F90

!****h* root/fortran/test/TH5P_F03
!
! NAME
!  tH5P_F03.F90
!
! FUNCTION
!  Test FORTRAN HDF5 H5P APIs which are dependent on FORTRAN 2003
!  features.
!
! COPYRIGHT
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!   Copyright by The HDF Group.                                               *
!   Copyright by the Board of Trustees of the University of Illinois.         *
!   All rights reserved.                                                      *
!                                                                             *
!   This file is part of HDF5.  The full HDF5 copyright notice, including     *
!   terms governing use, modification, and redistribution, is contained in    *
!   the COPYING file, which can be found at the root of the source code       *
!   distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
!   If you do not have access to either file, you may request a copy from     *
!   help@hdfgroup.org.                                                        *
! * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
!
! USES
!  test_genprop_cls_cb1_mod
!
! CONTAINS SUBROUTINES
!  test_create, test_genprop_class_callback
!
!*****

! *****************************************
! ***        H 5 P   T E S T S
! *****************************************
MODULE test_genprop_cls_cb1_mod

  ! Callback subroutine for test_genprop_class_callback
  ! and the function H5Pcreate_class_f.

  USE HDF5
  USE ISO_C_BINDING
  IMPLICIT NONE

  TYPE, BIND(C) :: cop_cb_struct_ !  Struct for iterations
    INTEGER :: count
    INTEGER(HID_T) :: id
  END TYPE cop_cb_struct_

CONTAINS

  INTEGER FUNCTION test_genprop_cls_cb1_f(list_id, create_data ) bind(C)

    IMPLICIT NONE

    INTEGER(HID_T), INTENT(IN), VALUE :: list_id

    TYPE(cop_cb_struct_) :: create_data

    create_data%count = create_data%count + 1
    create_data%id = list_id

    test_genprop_cls_cb1_f = 0

  END FUNCTION test_genprop_cls_cb1_f

END MODULE test_genprop_cls_cb1_mod

MODULE TH5P_F03

  USE HDF5
  USE TH5_MISC
  USE TH5_MISC_GEN
  USE ISO_C_BINDING

CONTAINS

!-------------------------------------------------------------------------
! * Function:	test_create
! *
! * Purpose:	Tests H5Pset_fill_value_f and H5Pget_fill_value_f
! *
! * Return:	Success:	0
! *
! *		Failure:	number of errors
! *
! * Programmer:	M. Scot Breitenfeld
! *             June 24, 2008
! *
! * Modifications:
! *
! *-------------------------------------------------------------------------
!

SUBROUTINE test_create(total_error)

  IMPLICIT NONE

  INTEGER, INTENT(INOUT) :: total_error
  INTEGER(HID_T) :: fapl

  INTEGER(hid_t) :: file=-1, space=-1, dcpl=-1, comp_type_id=-1
  INTEGER(hid_t) :: dset9=-1
  INTEGER(hsize_t), DIMENSION(1:5), PARAMETER :: cur_size = (/2, 8, 8, 4, 2/)
  INTEGER(hsize_t), DIMENSION(1:5), PARAMETER :: ch_size= (/1, 1, 1, 4, 1/)
  CHARACTER(LEN=14) :: filename ='test_create.h5'

  TYPE(comp_datatype), TARGET :: rd_c, fill_ctype
  INTEGER :: error
  INTEGER(SIZE_T) :: h5off
  TYPE(C_PTR) :: f_ptr
  CHARACTER(LEN=1) :: cfill
  INTEGER :: ifill
  REAL :: rfill
  REAL(KIND=dp) :: dpfill
  INTEGER :: low, high

  !
  ! * Create a file.
  !
  CALL h5fcreate_f(filename,H5F_ACC_TRUNC_F,file,error)
  CALL check("h5fcreate_f", error, total_error)

  CALL h5screate_simple_f(5, cur_size, space, error, cur_size)
  CALL check("h5screate_simple_f", error, total_error)

  CALL H5Pcreate_f(H5P_DATASET_CREATE_F, dcpl, error)
  CALL check("H5Pcreate_f", error, total_error)

  CALL h5pset_chunk_f(dcpl, 5, ch_size, error)
  CALL check("h5pset_chunk_f",error, total_error)

  !  Create a compound datatype
  CALL h5tcreate_f(H5T_COMPOUND_F, H5_SIZEOF(fill_ctype), comp_type_id, error)
  CALL check("h5tcreate_f", error, total_error)
  h5off = H5OFFSETOF(C_LOC(fill_ctype), C_LOC(fill_ctype%a))
  CALL h5tinsert_f(comp_type_id, "a", h5off , H5T_NATIVE_REAL, error)
  CALL check("h5tinsert_f", error, total_error)
  CALL h5tinsert_f(comp_type_id, "x", H5OFFSETOF(C_LOC(fill_ctype), C_LOC(fill_ctype%x)), H5T_NATIVE_INTEGER, error)
  CALL check("h5tinsert_f", error, total_error)
  CALL h5tinsert_f(comp_type_id, "y", H5OFFSETOF(C_LOC(fill_ctype), C_LOC(fill_ctype%y)), H5T_NATIVE_DOUBLE, error)
  CALL check("h5tinsert_f", error, total_error)
  CALL h5tinsert_f(comp_type_id, "z", &
       H5OFFSETOF(C_LOC(fill_ctype), C_LOC(fill_ctype%z)), H5T_NATIVE_CHARACTER, error)
  CALL check("h5tinsert_f", error, total_error)


  CALL H5Pset_alloc_time_f(dcpl, H5D_ALLOC_TIME_LATE_F,error)
  CALL check("H5Pset_alloc_time_f",error, total_error)

  CALL H5Pset_fill_time_f(dcpl, H5D_FILL_TIME_ALLOC_F, error)
  CALL check("H5Pset_fill_time_f",error, total_error)

  !  Compound datatype test

  f_ptr = C_LOC(fill_ctype)

  CALL H5Pget_fill_value_f(dcpl, comp_type_id, f_ptr, error)
  CALL check("H5Pget_fill_value_f",error, total_error)

  fill_ctype%y = 4444.D0
  fill_ctype%z = 'S'
  fill_ctype%a = 5555.
  fill_ctype%x = 55

  f_ptr = C_LOC(fill_ctype)

  ! Test various fill values
  CALL H5Pset_fill_value_f(dcpl, H5T_NATIVE_CHARACTER, 'X', error)
  CALL check("H5Pset_fill_value_f",error, total_error)
  CALL h5pget_fill_value_f(dcpl, H5T_NATIVE_CHARACTER, cfill, error)
  CALL check("H5Pget_fill_value_f",error, total_error)
  IF(cfill.NE.'X')THEN
     PRINT*,"***ERROR: Returned wrong fill value (character)"
     total_error = total_error + 1
  ENDIF
  CALL H5Pset_fill_value_f(dcpl, H5T_NATIVE_INTEGER, 9, error)
  CALL check("H5Pset_fill_value_f",error, total_error)
  CALL h5pget_fill_value_f(dcpl, H5T_NATIVE_INTEGER, ifill, error)
  CALL check("H5Pget_fill_value_f",error, total_error)
  IF(ifill.NE.9)THEN
     PRINT*,"***ERROR: Returned wrong fill value (integer)"
     total_error = total_error + 1
  ENDIF
  CALL H5Pset_fill_value_f(dcpl, H5T_NATIVE_DOUBLE, 1.0_dp, error)
  CALL check("H5Pset_fill_value_f",error, total_error)
  CALL h5pget_fill_value_f(dcpl, H5T_NATIVE_DOUBLE, dpfill, error)
  CALL check("H5Pget_fill_value_f",error, total_error)
  CALL VERIFY("***ERROR: Returned wrong fill value (double)", dpfill, 1.0_dp, total_error)
  CALL H5Pset_fill_value_f(dcpl, H5T_NATIVE_REAL, 2.0, error)
  CALL check("H5Pset_fill_value_f",error, total_error)
  CALL h5pget_fill_value_f(dcpl, H5T_NATIVE_REAL, rfill, error)
  CALL check("H5Pget_fill_value_f",error, total_error)
  CALL VERIFY("***ERROR: Returned wrong fill value (real)", rfill, 2.0, total_error)

  ! For the actual compound type
  CALL H5Pset_fill_value_f(dcpl, comp_type_id, f_ptr, error)
  CALL check("H5Pget_fill_value_f",error, total_error)

  CALL h5dcreate_f(file,"dset9", comp_type_id, space, dset9, error, dcpl_id=dcpl)
  CALL check("h5dcreate_f", error, total_error)

  CALL h5dclose_f(dset9, error)
  CALL check("h5dclose_f", error, total_error)

  CALL h5fclose_f(file,error)
  CALL check("h5fclose_f", error, total_error)

  !  Open the file and get the dataset fill value from each dataset
  CALL h5pcreate_f(H5P_FILE_ACCESS_F, fapl, error)
  CALL check("h5pcreate_f",error, total_error)

  CALL h5pset_libver_bounds_f(fapl, H5F_LIBVER_V18_F, H5F_LIBVER_V18_F, error)
  CALL check("h5pset_libver_bounds_f",error, total_error)
  CALL h5pget_libver_bounds_f(fapl, low, high, error)
  CALL check("h5pget_libver_bounds_f",error, total_error)
  CALL VERIFY("***ERROR: Returned wrong low libver_bounds", low, H5F_LIBVER_V18_F, total_error)
  CALL VERIFY("***ERROR: Returned wrong high libver_bounds", high, H5F_LIBVER_V18_F, total_error)

  CALL h5pset_libver_bounds_f(fapl, H5F_LIBVER_V18_F, H5F_LIBVER_V110_F, error)
  CALL check("h5pset_libver_bounds_f",error, total_error)
  CALL h5pget_libver_bounds_f(fapl, low, high, error)
  CALL check("h5pget_libver_bounds_f",error, total_error)
  CALL VERIFY("***ERROR: Returned wrong low libver_bounds", low, H5F_LIBVER_V18_F, total_error)
  CALL VERIFY("***ERROR: Returned wrong high libver_bounds", high, H5F_LIBVER_V110_F, total_error)

  CALL h5pset_libver_bounds_f(fapl, H5F_LIBVER_V112_F, H5F_LIBVER_V112_F, error)
  CALL check("h5pset_libver_bounds_f",error, total_error)
  CALL h5pget_libver_bounds_f(fapl, low, high, error)
  CALL check("h5pget_libver_bounds_f",error, total_error)
  CALL VERIFY("***ERROR: Returned wrong low libver_bounds", low, H5F_LIBVER_V112_F, total_error)
  CALL VERIFY("***ERROR: Returned wrong high libver_bounds", high, H5F_LIBVER_V112_F, total_error)

  CALL h5pset_libver_bounds_f(fapl, H5F_LIBVER_V114_F, H5F_LIBVER_V114_F, error)
  CALL check("h5pset_libver_bounds_f",error, total_error)
  CALL h5pget_libver_bounds_f(fapl, low, high, error)
  CALL check("h5pget_libver_bounds_f",error, total_error)
  CALL VERIFY("***ERROR: Returned wrong low libver_bounds", low, H5F_LIBVER_V114_F, total_error)
  CALL VERIFY("***ERROR: Returned wrong high libver_bounds", high, H5F_LIBVER_V114_F, total_error)

  CALL H5Pset_libver_bounds_f(fapl, H5F_LIBVER_LATEST_F, H5F_LIBVER_LATEST_F, error)
  CALL check("H5Pset_libver_bounds_f",error, total_error)
  CALL h5pget_libver_bounds_f(fapl, low, high, error)
  CALL check("h5pget_libver_bounds_f",error, total_error)
  CALL VERIFY("***ERROR: Returned wrong low libver_bounds", low, H5F_LIBVER_LATEST_F, total_error)
  CALL VERIFY("***ERROR: Returned wrong high libver_bounds", high, H5F_LIBVER_LATEST_F, total_error)
  IF(H5F_LIBVER_LATEST_F.GE.H5F_LIBVER_NBOUNDS_F)THEN
     WRITE(*,'(A,I0,A,I0,A)') &
          "***ERROR: H5F_LIBVER_LATEST_F (",H5F_LIBVER_LATEST_F,") .GE. H5F_LIBVER_NBOUNDS_F (",H5F_LIBVER_NBOUNDS_F,")"
     total_error = total_error + 1
  ENDIF

  CALL h5fopen_f (FILENAME, H5F_ACC_RDONLY_F, file, error, fapl)
  CALL check("h5fopen_f", error, total_error)

  ! Compound datatype test
  CALL h5dopen_f(file, "dset9", dset9, error)
  CALL check("h5dopen_f", error, total_error)

  CALL H5Pclose_f(dcpl, error)
  CALL check("H5Pclose_f", error, total_error)

  CALL H5Dget_create_plist_f(dset9, dcpl, error)
  CALL check("H5Dget_create_plist_f", error, total_error)

  f_ptr = C_LOC(rd_c)

  CALL H5Pget_fill_value_f(dcpl, comp_type_id, f_ptr, error)
  CALL check("H5Pget_fill_value_f", error, total_error)
  CALL verify("***ERROR: Returned wrong fill value", rd_c%a, fill_ctype%a, total_error)
  CALL verify("***ERROR: Returned wrong fill value", rd_c%y, fill_ctype%y, total_error)

  IF( rd_c%x .NE. fill_ctype%x .OR. &
      rd_c%z .NE. fill_ctype%z )THEN

     PRINT*,"***ERROR: Returned wrong fill value"
     total_error = total_error + 1

  ENDIF

  CALL h5dclose_f(dset9, error)
  CALL check("h5dclose_f", error, total_error)

  CALL H5Pclose_f(dcpl, error)
  CALL check("H5Pclose_f", error, total_error)

  CALL h5fclose_f(file,error)
  CALL check("h5fclose_f", error, total_error)

END SUBROUTINE test_create


SUBROUTINE test_genprop_class_callback(total_error)

  !
  !
  !  test_genprop_class_callback(): Test basic generic property list code.
  !      Tests callbacks for property lists in a generic class.
  !
  !  FORTRAN TESTS:
  !      Tests function H5Pcreate_class_f with callback.
  !
  !

  USE test_genprop_cls_cb1_mod
  IMPLICIT NONE

  INTEGER, INTENT(INOUT) :: total_error

  INTEGER(hid_t) :: cid1, cid2 ! Generic Property class ID
  INTEGER(hid_t) :: lid1, lid2 ! Generic Property list ID
  INTEGER(size_t) :: nprops ! Number of properties in class

  TYPE(cop_cb_struct_), TARGET :: crt_cb_struct, cls_cb_struct
  INTEGER :: CLASS1_NAME_SIZE = 7 ! length of class string
  CHARACTER(LEN=7) :: CLASS1_NAME = "Class 1", CLASS1_NAME_BUF
  TYPE(C_FUNPTR) :: f1, f5
  TYPE(C_PTR) :: f2, f6

  CHARACTER(LEN=10) :: PROP1_NAME = "Property 1"
  INTEGER(SIZE_T) :: PROP1_SIZE = 10
  CHARACTER(LEN=10) :: PROP2_NAME = "Property 2"
  INTEGER(SIZE_T) :: PROP2_SIZE = 10
  CHARACTER(LEN=10) :: PROP3_NAME = "Property 3"
  INTEGER(SIZE_T) :: PROP3_SIZE = 10
  CHARACTER(LEN=10) :: PROP4_NAME = "Property 4"
  INTEGER(SIZE_T) :: PROP4_SIZE = 10
  INTEGER :: PROP1_DEF_VALUE = 10
  INTEGER :: PROP2_DEF_VALUE = 10
  INTEGER :: PROP3_DEF_VALUE = 10
  INTEGER :: PROP4_DEF_VALUE = 10

  INTEGER :: error !  Generic RETURN value
  LOGICAL :: flag  ! for tests

  f1 = C_FUNLOC(test_genprop_cls_cb1_f)
  f5 = C_FUNLOC(test_genprop_cls_cb1_f)

  f2 = C_LOC(crt_cb_struct)
  f6 = C_LOC(cls_cb_struct)

  ! Create a new generic class, derived from the root of the class hierarchy
  CALL h5pcreate_class_f(h5p_ROOT_F, CLASS1_NAME, cid1, error, f1, f2, c_null_funptr, c_null_ptr, f5, f6)
  CALL check("h5pcreate_class_f", error, total_error)

  ! Insert first property into class (with no callbacks)
  CALL h5pregister_f(cid1, PROP1_NAME, PROP1_SIZE, PROP1_DEF_VALUE, error)
  CALL check("h5pregister_f", error, total_error)
  ! Insert second property into class (with no callbacks)
  CALL h5pregister_f(cid1, PROP2_NAME, PROP2_SIZE, PROP2_DEF_VALUE, error)
  CALL check("h5pregister_f", error, total_error)
  ! Insert third property into class (with no callbacks)
  CALL h5pregister_f(cid1, PROP3_NAME, PROP3_SIZE, PROP3_DEF_VALUE, error)
  CALL check("h5pregister_f", error, total_error)

  ! Insert fourth property into class (with no callbacks)
  CALL h5pregister_f(cid1, PROP4_NAME, PROP4_SIZE, PROP4_DEF_VALUE, error)
  CALL check("h5pregister_f", error, total_error)

  !  Check the number of properties in class
  CALL h5pget_nprops_f(cid1, nprops, error)
  CALL check("h5pget_nprops_f", error, total_error)
  CALL verify("h5pget_nprops_f", INT(nprops), 4, total_error)

  !  Initialize class callback structs

  crt_cb_struct%count = 0
  crt_cb_struct%id    = -1
  cls_cb_struct%count = 0
  cls_cb_struct%id    = -1

  ! Create a property list from the class
  CALL h5pcreate_f(cid1, lid1, error)
  CALL check("h5pcreate_f", error, total_error)

  ! Get the list's class
  CALL H5Pget_class_f(lid1, cid2, error)
  CALL check("H5Pget_class_f", error, total_error)

  !  Check that the list's class is correct
  CALL H5Pequal_f(cid2, cid1, flag, error)
  CALL check("H5Pequal_f", error, total_error)
  CALL verify("H5Pequal_f", flag, .TRUE., total_error)

  ! Check the class name
  CALL H5Pget_class_name_f(cid2, CLASS1_NAME_BUF, CLASS1_NAME_SIZE, error)
  CALL check("H5Pget_class_name_f", error, total_error)
  CALL verify("H5Pget_class_name_f", CLASS1_NAME_BUF, CLASS1_NAME, error)
  IF(error.NE.0)THEN
     WRITE(*,*) 'Class names do not match! name=',CLASS1_NAME_BUF, 'CLASS1_NAME=',CLASS1_NAME
     total_error = total_error + 1
  ENDIF
  ! Close class
  CALL h5pclose_class_f(cid2, error)
  CALL check("h5pclose_class_f", error, total_error)

  ! Verify that the creation callback occurred
  CALL verify("h5pcreate_f", crt_cb_struct%count, 1, total_error)
  CALL verify("h5pcreate_f", crt_cb_struct%id, lid1, total_error)

  !  Check the number of properties in list
  CALL h5pget_nprops_f(lid1,nprops, error)
  CALL check("h5pget_nprops_f", error, total_error)
  CALL verify("h5pget_nprops_f", INT(nprops), 4, total_error)

  !  Create another property list from the class
  CALL h5pcreate_f(cid1, lid2, error)
  CALL check("h5pcreate_f", error, total_error)

  !  Verify that the creation callback occurred
  CALL verify("h5pcreate_f", crt_cb_struct%count, 2, total_error)
  CALL verify("h5pcreate_f", crt_cb_struct%id, lid2, total_error)

  !  Check the number of properties in list
  CALL h5pget_nprops_f(lid2,nprops, error)
  CALL check("h5pget_nprops_f", error, total_error)
  CALL verify("h5pget_nprops_f", INT(nprops), 4, total_error)

  !  Close first list
  CALL h5pclose_f(lid1, error);
  CALL check("h5pclose_f", error, total_error)

  ! Verify that the close callback occurred
  CALL verify("h5pcreate_f", cls_cb_struct%count, 1, total_error)
  CALL verify("h5pcreate_f", cls_cb_struct%id, lid1, total_error)

  ! Close second list
  CALL h5pclose_f(lid2, error);
  CALL check("h5pclose_f", error, total_error)

  ! Verify that the close callback occurred
  CALL verify("h5pcreate_f", cls_cb_struct%count, 2, total_error)
  CALL verify("h5pcreate_f", cls_cb_struct%id, lid2, total_error)

  ! Close class
  CALL h5pclose_class_f(cid1, error)
  CALL check("h5pclose_class_f", error, total_error)

END SUBROUTINE test_genprop_class_callback

!-------------------------------------------------------------------------
! Function: test_h5p_file_image
!
! Purpose: Tests APIs:
!          h5pget_file_image_f and h5pset_file_image_f
!
! Return:      Success: 0
!              Failure: -1
!
! FORTRAN Programmer: M. Scot Breitenfeld
!                     April 1, 2014
!-------------------------------------------------------------------------

SUBROUTINE test_h5p_file_image(total_error)

  USE, INTRINSIC :: iso_c_binding
  IMPLICIT NONE
  INTEGER, INTENT(INOUT) :: total_error
  INTEGER(hid_t) ::   fapl_1 = -1
  INTEGER, PARAMETER :: count = 10
  INTEGER, DIMENSION(1:count), TARGET :: buffer
  INTEGER, DIMENSION(1:count), TARGET :: temp
  INTEGER :: i
  INTEGER(size_t) :: size
  INTEGER(size_t) :: temp_size
  INTEGER :: error ! error return value
  TYPE(C_PTR) :: f_ptr
  TYPE(C_PTR), DIMENSION(1:count) :: f_ptr1
  TYPE(C_PTR), DIMENSION(1:1) :: f_ptr2

  ! Initialize file image buffer
  DO i = 1, count
     buffer(i) = i*10
  ENDDO

  ! Create fapl
  CALL h5pcreate_f(H5P_FILE_ACCESS_F, fapl_1, error)
  CALL check("h5pcreate_f", error, total_error)

  ! Test with NULL ptr
  f_ptr2(1) = C_NULL_PTR
  temp_size = 1
  CALL h5pget_file_image_f(fapl_1, f_ptr2, temp_size, error)
  CALL check("h5pget_file_image_f", error, total_error)
  CALL verify("h5pget_file_image_f", INT(temp_size), 0, total_error)

  ! Set file image
  f_ptr = C_LOC(buffer(1))
  size = H5_SIZEOF(buffer(1))*count

  CALL h5pset_file_image_f(fapl_1, f_ptr, size, error)
  CALL check("h5pset_file_image_f", error, total_error)

  ! Get the same data back
  DO i = 1, count
     f_ptr1(i) = C_LOC(temp(i))
  ENDDO

  temp_size = 0
  CALL h5pget_file_image_f(fapl_1, f_ptr1, temp_size, error)
  CALL check("h5pget_file_image_f", error, total_error)

  ! Check that sizes are the same, and that the buffers are identical but separate
  CALL verify("h5pget_file_image_f", INT(temp_size), INT(size), total_error)

  ! Verify the image data is correct
  DO i = 1, count
     CALL verify("h5pget_file_image_f", temp(i), buffer(i), total_error)
  ENDDO

END SUBROUTINE test_h5p_file_image

!-------------------------------------------------------------------------
! Function: external_test_offset
!
! Purpose: Tests APIs:
!      h5pset_external_f (with offsets not equal to zero), h5pget_external_f
!
! Return:      Success: 0
!              Failure: -1
!
! FORTRAN Programmer: M. Scot Breitenfeld
!                     January 10, 2012
!-------------------------------------------------------------------------
!
SUBROUTINE external_test_offset(cleanup,total_error)

  IMPLICIT NONE
  INTEGER, INTENT(INOUT) :: total_error
  LOGICAL, INTENT(IN)  :: cleanup

  INTEGER(hid_t) :: fapl=-1   ! file access property list
  INTEGER(hid_t) :: file=-1   ! file to write to
  INTEGER(hid_t) :: dcpl=-1   ! dataset creation properties
  INTEGER(hid_t) :: space=-1  ! data space
  INTEGER(hid_t) :: dset=-1   ! dataset
  INTEGER(hid_t) :: grp=-1    ! group to emit diagnostics
  INTEGER(size_t) :: i, j     ! miscellaneous counters
  CHARACTER(LEN=180) :: filename   ! file names
  INTEGER, DIMENSION(1:25) :: part
  INTEGER, DIMENSION(1:100), TARGET :: whole ! raw data buffers
  INTEGER(hsize_t), DIMENSION(1:1) :: cur_size ! current data space size
  INTEGER(hid_t) :: hs_space  ! hyperslab data space
  INTEGER(hsize_t), DIMENSION(1:1) :: hs_start = (/30/) ! hyperslab starting offset
  INTEGER(hsize_t), DIMENSION(1:1) :: hs_count = (/25/) ! hyperslab size
  CHARACTER(LEN=1) :: ichr1 ! character conversion holder
  INTEGER :: error ! error status
  TYPE(C_PTR) :: f_ptr ! fortran pointer
  INTEGER(HSIZE_T) :: sizeof_part

  CHARACTER(LEN=1,KIND=C_CHAR), DIMENSION(1:30) :: temparray

  temparray(1:30)(1:1) = '0' ! 1 byte character

  ! Write the data to external files directly
  DO i = 1, 4
     DO j = 1, 25
        part(j) = INT((i-1_size_t)*25_size_t+(j-1_size_t))
     ENDDO
     WRITE(ichr1,'(I1.1)') i
     filename = "extern_"//ichr1//"a.raw"
     OPEN(10, FILE=filename, ACCESS='STREAM', form='UNFORMATTED')

     WRITE(10) temparray(1:(i-1)*10)
     WRITE(10) part
     CLOSE(10)
  ENDDO
  !
  ! Create the file and an initial group.
  CALL h5pcreate_f(H5P_FILE_ACCESS_F, fapl, error)
  CALL h5fcreate_f('extren_raw.h5', H5F_ACC_TRUNC_F, file, error, access_prp=fapl)
  CALL check("h5fcreate_f",error,total_error)

  CALL h5gcreate_f(file, "emit-diagnostics", grp, error)
  CALL check("h5gcreate_f",error, total_error)

  ! Create the dataset

  sizeof_part = INT(H5_SIZEOF(part(1))*25, hsize_t)

  CALL h5pcreate_f(H5P_DATASET_CREATE_F, dcpl, error)
  CALL check("h5pcreate_f", error, total_error)
  CALL h5pset_external_f(dcpl, "extern_1a.raw", INT(0,off_t), sizeof_part, error)
  CALL check("h5pset_external_f",error,total_error)
  CALL h5pset_external_f(dcpl, "extern_2a.raw", INT(10,off_t), sizeof_part, error)
  CALL check("h5pset_external_f",error,total_error)
  CALL h5pset_external_f(dcpl, "extern_3a.raw", INT(20,off_t), sizeof_part, error)
  CALL check("h5pset_external_f",error,total_error)
  CALL h5pset_external_f(dcpl, "extern_4a.raw", INT(30,off_t), sizeof_part, error)
  CALL check("h5pset_external_f",error,total_error)

  cur_size(1) = 100
  CALL h5screate_simple_f(1, cur_size, space, error)
  CALL check("h5screate_simple_f", error, total_error)
  CALL h5dcreate_f(file, "dset1", H5T_NATIVE_INTEGER, space, dset,error,dcpl_id=dcpl)
  CALL check("h5dcreate_f", error, total_error)

  !
  ! Read the entire dataset and compare with the original
  whole(:) = 0
  f_ptr = C_LOC(whole(1))
  CALL h5dread_f(dset, H5T_NATIVE_INTEGER, f_ptr, error, mem_space_id=space, file_space_id=space)
  CALL check("h5dread_f", error, total_error)

  DO i = 1, 100
     IF(whole(i) .NE. i-1)THEN
        WRITE(*,*) "Incorrect value(s) read."
        total_error =  total_error + 1
        EXIT
     ENDIF
  ENDDO
  !
  ! Read the middle of the dataset
  CALL h5scopy_f(space, hs_space, error)
  CALL check("h5scopy_f", error, total_error)
  CALL h5sselect_hyperslab_f(hs_space, H5S_SELECT_SET_F, hs_start, hs_count, error)
  CALL check("h5sselect_hyperslab_f", error, total_error)

  whole(:) = 0
  f_ptr = C_LOC(whole(1))
  CALL h5dread_f(dset, H5T_NATIVE_INTEGER, f_ptr, error, mem_space_id=hs_space, file_space_id=hs_space)
  CALL check("h5dread_f", error, total_error)

  CALL h5sclose_f(hs_space, error)
  CALL check("h5sclose_f", error, total_error)
  DO i = INT(hs_start(1))+1, INT(hs_start(1)+hs_count(1))
     IF(whole(i) .NE. i-1)THEN
        WRITE(*,*) "Incorrect value(s) read."
        total_error =  total_error + 1
        EXIT
     ENDIF
  ENDDO

  CALL h5dclose_f(dset, error)
  CALL check("h5dclose_f", error, total_error)
  CALL h5pclose_f(dcpl, error)
  CALL check("h5pclose_f", error, total_error)
  CALL h5sclose_f(space, error)
  CALL check("h5sclose_f", error, total_error)
  CALL h5fclose_f(file, error)
  CALL check("h5fclose_f", error, total_error)

  ! cleanup
  DO i = 1, 4
     WRITE(ichr1,'(I1.1)') i
     filename = "extern_"//ichr1//"a.raw"
     CALL h5_cleanup_f(filename, H5P_DEFAULT_F, error)
     CALL check("h5_cleanup_f", error, total_error)
  ENDDO
  IF(cleanup) CALL h5_cleanup_f("extren_raw.h5", H5P_DEFAULT_F, error)
  CALL check("h5_cleanup_f", error, total_error)

END SUBROUTINE external_test_offset

!-------------------------------------------------------------------------
! NAME
!  test_vds
!
! FUNCTION
!  Tests VDS API wrappers
!
! RETURNS:
!   Success:	0
!   Failure:	number of errors
!
! FORTRAN Programmer:  M. Scot Breitenfeld
!                      February 1, 2016
!
!-------------------------------------------------------------------------
!
SUBROUTINE test_vds(total_error)

  USE ISO_C_BINDING
  IMPLICIT NONE

  INTEGER, INTENT(INOUT) :: total_error

  CHARACTER(LEN=6), PARAMETER ::  VFILENAME="vds.h5"
  CHARACTER(LEN=3), PARAMETER :: DATASET="VDS"
  INTEGER(hsize_t) :: VDSDIM0
  INTEGER(hsize_t), PARAMETER :: VDSDIM1 = 10
  INTEGER(hsize_t), PARAMETER :: VDSDIM2 = 15

  INTEGER(hsize_t) :: DIM0
  INTEGER, PARAMETER :: DIM0_1= 4  ! Initial size of the source datasets
  INTEGER, PARAMETER :: DIM1 = 10
  INTEGER, PARAMETER :: DIM2 = 15
  INTEGER, PARAMETER :: RANK =  3
  INTEGER(hsize_t), PARAMETER :: PLANE_STRIDE = 4

  CHARACTER(LEN=4), DIMENSION(1:PLANE_STRIDE) :: SRC_FILE = (/"a.h5","b.h5","c.h5","d.h5"/)
  CHARACTER(LEN=3), DIMENSION(1:PLANE_STRIDE) :: SRC_DATASET = (/"AAA","BBB","CCC","DDD"/)


  INTEGER(hid_t) :: vfile, file, src_space, mem_space, vspace, vdset, dset !Handles
  INTEGER(hid_t) :: dcpl, dapl
  INTEGER :: error
  INTEGER(hsize_t), DIMENSION(1:3) :: &
       vdsdims = (/4_hsize_t*INT(DIM0_1,hsize_t), VDSDIM1, VDSDIM2/), &
                 vdsdims_max, &
                 dims = (/DIM0_1, DIM1, DIM2/), &
                 memdims = (/DIM0_1, DIM1, DIM2/), &
                 extdims = (/0, DIM1, DIM2/), & ! Dimensions of the extended source datasets
                 chunk_dims = (/DIM0_1, DIM1, DIM2/), &
                 dims_max, &
                 vdsdims_out, vdsdims_max_out, &
                 start, &                   ! Hyperslab parameters
                 stride, &
                 count, &
                 src_count, block
  INTEGER(hsize_t), DIMENSION(1:2,1:3) :: vdsdims_out_correct

  INTEGER(hsize_t), DIMENSION(1:3) :: start_out, &  !Hyperslab PARAMETER out
                 stride_out, count_out, block_out
  INTEGER(hsize_t), DIMENSION(1:3,1:PLANE_STRIDE) :: start_correct

  INTEGER :: i, j
  INTEGER(size_t) :: i_sz
  INTEGER :: layout                     ! Storage layout
  INTEGER(size_t) :: num_map            ! Number of mappings
  INTEGER(size_t) :: len                ! Length of the string also a RETURN value
  ! Different sized character buffers
  CHARACTER(len=LEN(SRC_FILE(1))-3)  :: SRC_FILE_LEN_TINY
  CHARACTER(len=LEN(SRC_FILE(1))-1)  :: SRC_FILE_LEN_SMALL
  CHARACTER(len=LEN(SRC_FILE(1)))    :: SRC_FILE_LEN_EXACT
  CHARACTER(len=LEN(SRC_FILE(1))+1)  :: SRC_FILE_LEN_LARGE
  CHARACTER(len=LEN(SRC_FILE(1))+10) :: SRC_FILE_LEN_HUGE
  CHARACTER(len=LEN(SRC_DATASET(1))) :: SRC_DATASET_LEN_EXACT

  INTEGER(HID_T) :: space_out

  INTEGER :: s_type, virtual_view
  INTEGER :: type1, type2

  INTEGER, DIMENSION(DIM0_1*DIM1*DIM2), TARGET :: wdata
  TYPE(C_PTR) :: f_ptr
  INTEGER(SIZE_T) :: nsize
  LOGICAL :: IsRegular
  INTEGER(HSIZE_T) :: gap_size

  ! For testing against
  vdsdims_out_correct(1,1) = DIM0_1*5
  vdsdims_out_correct(2,1) = DIM0_1*8
  vdsdims_out_correct(1:2,2) = VDSDIM1
  vdsdims_out_correct(1:2,3) = VDSDIM2

  VDSDIM0 = H5S_UNLIMITED_F
  DIM0 = H5S_UNLIMITED_F
  vdsdims_max = (/VDSDIM0, VDSDIM1, VDSDIM2/)
  dims_max = (/INT(DIM0,hsize_t), INT(DIM1,hsize_t), INT(DIM2,hsize_t)/)

  !
  ! Create source files and datasets.
  !
  DO i = 1, PLANE_STRIDE
     !
     ! Initialize data for i-th source dataset.
     DO j = 1, DIM0_1*DIM1*DIM2
        wdata(j) = i
     ENDDO
     !
     ! Create the source files and  datasets. Write data to each dataset and
     ! close all resources.
     CALL h5fcreate_f(SRC_FILE(i), H5F_ACC_TRUNC_F, file, error)
     CALL check("h5fcreate_f", error, total_error)

     CALL h5screate_simple_f(RANK, dims,  src_space, error, dims_max)
     CALL check("h5screate_simple_f", error, total_error)
     CALL h5pcreate_f(H5P_DATASET_CREATE_F, dcpl, error)
     CALL check("h5pcreate_f", error, total_error)
     CALL h5pset_chunk_f(dcpl, RANK, chunk_dims, error)
     CALL check("h5pset_chunk_f",error, total_error)

     CALL h5dcreate_f(file, SRC_DATASET(i), H5T_NATIVE_INTEGER, src_space, dset, error, dcpl, H5P_DEFAULT_F, H5P_DEFAULT_F)
     CALL check("h5dcreate_f",error, total_error)
     f_ptr = C_LOC(wdata(1))
     CALL H5Dwrite_f(dset, H5T_NATIVE_INTEGER, f_ptr, error)
     CALL check("H5Dwrite_f",error, total_error)
     CALL H5Sclose_f(src_space, error)
     CALL check("H5Sclose_f",error, total_error)
     CALL H5Pclose_f(dcpl, error)
     CALL check("H5Pclose_f",error, total_error)
     CALL H5Dclose_f(dset, error)
     CALL check("H5Dclose_f",error, total_error)
     CALL H5Fclose_f(file, error)
     CALL check("H5Fclose_f",error, total_error)
  ENDDO

  CALL h5fcreate_f(VFILENAME, H5F_ACC_TRUNC_F, vfile, error)
  CALL check("h5fcreate_f", error, total_error)

  ! Create VDS dataspace.
  CALL H5Screate_simple_f(RANK, vdsdims, vspace, error, vdsdims_max)
  CALL check("H5Screate_simple_f", error, total_error)

  ! Create dataspaces for the source dataset.
  CALL H5Screate_simple_f(RANK, dims, src_space, error, dims_max)
  CALL check("H5Screate_simple_f", error, total_error)

  ! Create VDS creation property
  CALL H5Pcreate_f (H5P_DATASET_CREATE_F, dcpl, error)
  CALL check("H5Pcreate_f", error, total_error)

  ! Initialize hyperslab values
  start(1:3) = 0
  stride(1:3) = (/PLANE_STRIDE,1_hsize_t,1_hsize_t/) ! we will select every fifth plane in VDS
  count(1:3) = (/H5S_UNLIMITED_F,1_hsize_t,1_hsize_t/)
  src_count(1:3) = (/H5S_UNLIMITED_F,1_hsize_t,1_hsize_t/)
  block(1:3) = (/1, DIM1, DIM2/)

  !
  ! Build the mappings
  !
  start_correct = 0
  CALL H5Sselect_hyperslab_f(src_space, H5S_SELECT_SET_F, start, src_count, error, block=block)
  CALL check("H5Sselect_hyperslab_f", error, total_error)
  DO i = 1, PLANE_STRIDE
     start_correct(1,i) = start(1)
     CALL H5Sselect_hyperslab_f(vspace, H5S_SELECT_SET_F, start, count, error, stride=stride, block=block)
     CALL check("H5Sselect_hyperslab_f", error, total_error)

     IF(i.eq.1)THEN ! check src_file and src_dataset with trailing blanks
        CALL H5Pset_virtual_f (dcpl, vspace, SRC_FILE(i)//"   ", SRC_DATASET(i)//"   ", src_space, error)
     ELSE
        CALL H5Pset_virtual_f (dcpl, vspace, SRC_FILE(i), SRC_DATASET(i), src_space, error)
     ENDIF
     CALL check("H5Pset_virtual_f", error, total_error)
     start(1) = start(1) + 1
  ENDDO

  CALL H5Sselect_none_f(vspace, error)
  CALL check("H5Sselect_none_f", error, total_error)

  ! Create a virtual dataset
  CALL H5Dcreate_f(vfile, DATASET, H5T_NATIVE_INTEGER, vspace, vdset, error, dcpl, H5P_DEFAULT_F, H5P_DEFAULT_F)
  CALL check("H5Dcreate_f", error, total_error)
  CALL H5Sclose_f(vspace, error)
  CALL check("H5Sclose_f", error, total_error)
  CALL H5Sclose_f(src_space, error)
  CALL check("H5Sclose_f", error, total_error)
  CALL H5Pclose_f(dcpl, error)
  CALL check("H5Pclose_f", error, total_error)

  ! Let's add data to the source datasets and check new dimensions for VDS
  ! We will add only one plane to the first source dataset, two planes to the
  ! second one, three to the third, and four to the forth.

  DO i = 1, PLANE_STRIDE
     !
     ! Initialize data for i-th source dataset.
     DO j = 1, i*DIM1*DIM2
        wdata(j) = 10*i
     ENDDO

     !
     ! Open the source files and datasets. Append data to each dataset and
     ! close all resources.
     CALL H5Fopen_f (SRC_FILE(i), H5F_ACC_RDWR_F, file, error)
     CALL check("H5Fopen_f", error, total_error)
     CALL H5Dopen_f (file, SRC_DATASET(i), dset, error)
     CALL check("H5Dopen_f", error, total_error)
     extdims(1) = DIM0_1+i
     CALL H5Dset_extent_f(dset, extdims, error)
     CALL check("H5Dset_extent_f", error, total_error)
     CALL H5Dget_space_f(dset, src_space, error)
     CALL check("H5Dget_space_f", error, total_error)

     start(1:3) = (/DIM0_1,0,0/)
     count(1:3) = 1
     block(1:3) = (/i, DIM1, DIM2/)

     memdims(1) = i

     CALL H5Screate_simple_f(RANK, memdims, mem_space, error)
     CALL check("H5Screate_simple_f", error, total_error)

     CALL H5Sselect_hyperslab_f(src_space, H5S_SELECT_SET_F, start,count, error,block=block)
     CALL check("H5Sselect_hyperslab_f", error, total_error)
     f_ptr = C_LOC(wdata(1))
     CALL H5Dwrite_f(dset, H5T_NATIVE_INTEGER, f_ptr, error, mem_space, src_space, H5P_DEFAULT_F)
     CALL check("H5Dwrite_f", error, total_error)
     CALL H5Sclose_f(src_space, error)
     CALL check("H5Sclose_f", error, total_error)
     call H5Dclose_f(dset, error)
     CALL check("H5Dclose_f", error, total_error)
     call H5Fclose_f(file, error)
     CALL check("H5Fclose_f", error, total_error)
  ENDDO

  call H5Dclose_f(vdset, error)
  CALL check("H5Dclose_f", error, total_error)
  call H5Fclose_f(vfile, error)
  CALL check("H5Fclose_f", error, total_error)

  !
  ! begin the read section
  !
  ! Open file and dataset using the default properties.
  CALL H5Fopen_f(VFILENAME, H5F_ACC_RDONLY_F, vfile, error)
  CALL check("H5Fopen_f", error, total_error)

  !
  ! Open VDS using different access properties to use max or
  ! min extents depending on the sizes of the underlying datasets
  CALL H5Pcreate_f(H5P_DATASET_ACCESS_F, dapl, error)
  CALL check("H5Pcreate_f", error, total_error)

  DO i = 1, 2

     IF(i.NE.1)THEN
        CALL H5Pset_virtual_view_f(dapl, H5D_VDS_LAST_AVAILABLE_F, error)
        CALL check("H5Pset_virtual_view_f", error, total_error)
     ELSE
        CALL H5Pset_virtual_view_f(dapl, H5D_VDS_FIRST_MISSING_F, error)
        CALL check("H5Pset_virtual_view_f", error, total_error)
     ENDIF

     CALL H5Dopen_f(vfile, DATASET, vdset, error, dapl)
     CALL check("H5Dopen_f", error, total_error)

     ! Let's get space of the VDS and its dimension we should get 32(or 20)x10x10
     CALL H5Dget_space_f(vdset, vspace, error)
     CALL check("H5Dget_space_f", error, total_error)
     CALL H5Sget_simple_extent_dims_f(vspace, vdsdims_out, vdsdims_max_out, error)
     CALL check("H5Sget_simple_extent_dims_f", error, total_error)

     ! check VDS dimensions
     DO j = 1, RANK
        IF(vdsdims_out(j).NE.vdsdims_out_correct(i,j))THEN
           total_error = total_error + 1
           EXIT
        ENDIF
     ENDDO

     CALL H5Pget_virtual_view_f(dapl, virtual_view, error)
     CALL check("h5pget_virtual_view_f", error, total_error)

     IF(i.EQ.1)THEN
        IF(virtual_view .NE. H5D_VDS_FIRST_MISSING_F)THEN
           total_error = total_error + 1
        ENDIF
     ELSE
        IF(virtual_view .NE. H5D_VDS_LAST_AVAILABLE_F)THEN
           total_error = total_error + 1
        ENDIF

     ENDIF

     ! Close
     CALL H5Dclose_f(vdset, error)
     CALL check("H5Dclose_f", error, total_error)
     CALL H5Sclose_f(vspace, error)
     CALL check("H5Sclose_f", error, total_error)
  ENDDO

  CALL H5Dopen_f(vfile, DATASET, vdset, error)
  CALL check("H5Dopen_f", error, total_error)

  !
  ! Get creation property list and mapping properties.
  !
  CALL H5Dget_create_plist_f (vdset, dcpl, error)
  CALL check("H5Dget_create_plist_f", error, total_error)

  !
  ! Get storage layout.
  CALL H5Pget_layout_f(dcpl, layout, error)
  CALL check("H5Pget_layout_f", error, total_error)

  IF (H5D_VIRTUAL_F .NE. layout) THEN
     PRINT*,"Wrong layout found"
     total_error = total_error + 1
  ENDIF

  !
  ! Find number of mappings.

  CALL H5Pget_virtual_count_f(dcpl, num_map, error)
  CALL check("H5Pget_virtual_count_f", error, total_error)

  IF(num_map.NE.4_size_t)THEN
     PRINT*,"Number of mappings is incorrect"
     total_error = total_error + 1
  ENDIF
  !
  ! Get mapping parameters for each mapping.
  !
  DO i_sz = 1, num_map
     CALL H5Pget_virtual_vspace_f(dcpl, INT(i_sz-1,size_t), vspace, error)
     CALL check("H5Pget_virtual_vspace_f", error, total_error)

     CALL h5sget_select_type_f(vspace, s_type, error)
     CALL check("h5sget_select_type_f", error, total_error)
     IF(s_type.EQ.H5S_SEL_HYPERSLABS_F)THEN
        CALL H5Sis_regular_hyperslab_f(vspace, IsRegular, error)
        CALL check("H5Sis_regular_hyperslab_f", error, total_error)

        IF(IsRegular)THEN
           CALL H5Sget_regular_hyperslab_f(vspace, start_out, stride_out, count_out, block_out, error)
           CALL check("H5Sget_regular_hyperslab_f", error, total_error)
           DO j = 1, 3
              IF(start_out(j).NE.start_correct(j,i_sz) .OR. &
                   stride_out(j).NE.stride(j).OR. &
                   count_out(j).NE.src_count(j))THEN
                 total_error = total_error + 1
                 EXIT
              ENDIF
           ENDDO
        ENDIF
     END IF

     ! Get source file name
     CALL H5Pget_virtual_filename_f(dcpl, INT(i-1, size_t), SRC_FILE_LEN_EXACT, error, nsize)
     CALL check("H5Pget_virtual_filename_f", error, total_error)

     IF(nsize.NE.LEN(SRC_FILE_LEN_EXACT))THEN
        PRINT*,"virtual filenname size is incorrect"
        total_error = total_error + 1
     ENDIF
     ! check passing a buffer that is very small
     CALL H5Pget_virtual_filename_f(dcpl, INT(i-1, size_t), SRC_FILE_LEN_TINY, error)
     CALL check("H5Pget_virtual_filename_f", error, total_error)
     IF(SRC_FILE_LEN_TINY.NE.SRC_FILE(i)(1:LEN(SRC_FILE_LEN_TINY)))THEN
        PRINT*,"virtual filenname returned is incorrect"
        total_error = total_error + 1
     ENDIF
     ! check passing a buffer that small by one
     CALL H5Pget_virtual_filename_f(dcpl, INT(i-1, size_t), SRC_FILE_LEN_SMALL, error)
     CALL check("H5Pget_virtual_filename_f", error, total_error)
     IF(SRC_FILE_LEN_SMALL.NE.SRC_FILE(i)(1:LEN(SRC_FILE_LEN_SMALL)))THEN
        PRINT*,"virtual filenname returned is incorrect"
        total_error = total_error + 1
     ENDIF
     ! check passing a buffer that is exact
     CALL H5Pget_virtual_filename_f(dcpl, INT(i-1, size_t), SRC_FILE_LEN_EXACT, error)
     CALL check("H5Pget_virtual_filename_f", error, total_error)
     IF(SRC_FILE_LEN_EXACT.NE.SRC_FILE(i)(1:LEN(SRC_FILE_LEN_EXACT)))THEN
        PRINT*,"virtual filenname returned is incorrect"
        total_error = total_error + 1
     ENDIF
     ! check passing a buffer that bigger by one
     CALL H5Pget_virtual_filename_f(dcpl, INT(i-1, size_t), SRC_FILE_LEN_LARGE, error)
     CALL check("H5Pget_virtual_filename_f", error, total_error)
     IF(SRC_FILE_LEN_LARGE(1:LEN(SRC_FILE_LEN_EXACT)).NE.SRC_FILE(i)(1:LEN(SRC_FILE_LEN_EXACT)).AND. &
         SRC_FILE_LEN_LARGE(LEN(SRC_FILE_LEN_EXACT):).NE.'')THEN
        PRINT*,"virtual filenname returned is incorrect"
        total_error = total_error + 1
     ENDIF
     ! check passing a buffer that is very big
     CALL H5Pget_virtual_filename_f(dcpl, INT(i-1, size_t), SRC_FILE_LEN_HUGE, error)
     CALL check("H5Pget_virtual_filename_f", error, total_error)
     IF(SRC_FILE_LEN_HUGE(1:LEN(SRC_FILE_LEN_EXACT)).NE.SRC_FILE(i)(1:LEN(SRC_FILE_LEN_EXACT)).AND. &
         SRC_FILE_LEN_HUGE(LEN(SRC_FILE_LEN_EXACT):).NE.'')THEN
        PRINT*,"virtual filenname returned is incorrect"
        total_error = total_error + 1
     ENDIF
     ! Get source dataset name
     CALL H5Pget_virtual_dsetname_f(dcpl, INT(i-1, size_t), SRC_DATASET_LEN_EXACT, error, nsize)
     CALL check("H5Pget_virtual_dsetname_f", error, total_error)

     CALL H5Pget_virtual_dsetname_f(dcpl, INT(i-1, size_t), SRC_DATASET_LEN_EXACT, error)
     CALL check("H5Pget_virtual_dsetname_f", error, total_error)
     IF(SRC_DATASET_LEN_EXACT(1:LEN(SRC_DATASET_LEN_EXACT)).NE.SRC_DATASET(i)(1:LEN(SRC_DATASET_LEN_EXACT)).AND. &
         SRC_DATASET_LEN_EXACT(LEN(SRC_DATASET_LEN_EXACT):).NE.'')THEN
        PRINT*,"virtual dataset returned is incorrect"
        total_error = total_error + 1
     ENDIF

     CALL h5pget_virtual_srcspace_f(dcpl, i_sz - 1_size_t, space_out, error)
     CALL check("H5Pget_virtual_srcspace_f", error, total_error)

     CALL h5sget_select_type_f(space_out, type1, error)
     CALL check("H5Sget_select_type_f", error, total_error)
     CALL h5sget_select_type_f(vspace, type2, error)
     CALL check("H5Sget_select_type_f", error, total_error)

     IF(type1.NE.type2)THEN
        total_error = total_error + 1
     ENDIF

  ENDDO
  !
  ! Close and release resources.

  ! Clear virtual layout in DCPL
  CALL h5pset_layout_f(dcpl, H5D_VIRTUAL_F,error)
  CALL check("H5Pset_layout_f", error, total_error)

  CALL H5Pclose_f(dcpl, error)
  CALL check("H5Pclose_f", error, total_error)
  CALL H5Dclose_f(vdset, error)
  CALL check("H5Dclose_f", error, total_error)

  ! Reopen VDS with printf gap set to 1

  CALL H5Pset_virtual_printf_gap_f(dapl, 1_hsize_t, error)
  CALL check("H5Pset_virtual_printf_gap_f", error, total_error)

  CALL H5Dopen_f(vfile, DATASET, vdset, error, dapl)
  CALL check("H5Dopen_f", error, total_error)

  CALL H5Pget_virtual_printf_gap_f(dapl, gap_size, error)
  CALL check("H5Pget_virtual_printf_gap_f", error, total_error)

  IF(gap_size.NE.1_hsize_t)THEN
     PRINT*,"gapsize is incorrect"
     total_error = total_error + 1
  ENDIF

  CALL H5Dclose_f(vdset, error)
  CALL check("H5Dclose_f", error, total_error)
  CALL H5Sclose_f(vspace, error)
  CALL check("H5Sclose_f", error, total_error)
  CALL H5Pclose_f(dapl, error)
  CALL check("H5Pclose_f", error, total_error)
  CALL H5Fclose_f(vfile, error)
  CALL check("H5Fclose_f", error, total_error)

END SUBROUTINE test_vds


END MODULE TH5P_F03