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Clean up off_t usage #4095

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Mar 9, 2024
Merged

Clean up off_t usage #4095

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2 changes: 1 addition & 1 deletion HDF5Examples/FORTRAN/H5D/h5ex_d_extern.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,7 @@ PROGRAM main
INTEGER :: i, j
! This change was introduced in the 1.8.12 release
#if H5_VERSION_GE(1,8,12)
INTEGER(OFF_T) :: offset = 0 ! Offset, in bytes, from thebeginning of the file to the
INTEGER(OFF_T) :: offset = 0 ! Offset, in bytes, from the beginning of the file to the
! location in the file where the data starts.
#else
INTEGER :: offset = 0
Expand Down
4 changes: 4 additions & 0 deletions c++/src/H5DcreatProp.cpp
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Expand Up @@ -645,6 +645,8 @@ DSetCreatPropList::setFletcher32() const
/// the total size is larger than the size of a dataset then the
/// dataset can be extended (provided the data space also allows
/// the extending).
///\note On Windows, off_t is typically a 32-bit signed long value, which
/// limits the valid offset that can be set to 2 GiB.
//--------------------------------------------------------------------------
void
DSetCreatPropList::setExternal(const char *name, off_t offset, hsize_t size) const
Expand Down Expand Up @@ -693,6 +695,8 @@ DSetCreatPropList::getExternalCount() const
/// external file name will not be returned. If \a offset or
/// \a size are null pointers then the corresponding information
/// will not be returned.
///\note On Windows, off_t is typically a 32-bit signed long value, which
/// limits the valid offset that can be returned to 2 GiB.
//--------------------------------------------------------------------------
void
DSetCreatPropList::getExternal(unsigned idx, size_t name_size, char *name, off_t &offset, hsize_t &size) const
Expand Down
8 changes: 7 additions & 1 deletion fortran/src/H5Pff.F90
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Expand Up @@ -1615,6 +1615,9 @@ END SUBROUTINE h5pget_filter_f
!! \param bytes Size of the external file data.
!! \param hdferr \fortran_error
!!
!! \note On Windows, off_t is typically a 32-bit signed long value, which
!! limits the valid offset that can be set to 2 GiB.
!!
!! See C API: @ref H5Pset_external()
!!
SUBROUTINE h5pset_external_f(prp_id, name, offset, bytes, hdferr)
Expand Down Expand Up @@ -1686,9 +1689,12 @@ END SUBROUTINE h5pget_external_count_f
!! \param bytes Size of the external file data.
!! \param hdferr \fortran_error
!!
!! \note On Windows, off_t is typically a 32-bit signed long value, which
!! limits the valid offset that can be returned to 2 GiB.
!!
!! See C API: @ref H5Pget_external()
!!
SUBROUTINE h5pget_external_f(prp_id, idx, name_size, name, offset,bytes, hdferr)
SUBROUTINE h5pget_external_f(prp_id, idx, name_size, name, offset, bytes, hdferr)
IMPLICIT NONE
INTEGER(HID_T), INTENT(IN) :: prp_id
INTEGER, INTENT(IN) :: idx
Expand Down
8 changes: 4 additions & 4 deletions src/H5FDcore.c
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Expand Up @@ -393,7 +393,7 @@ H5FD__core_write_to_bstore(H5FD_core_t *file, haddr_t addr, size_t size)
int myerrno = errno;
time_t mytime = HDtime(NULL);

offset = HDlseek(file->fd, (HDoff_t)0, SEEK_CUR);
offset = HDlseek(file->fd, 0, SEEK_CUR);

HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"write to backing store failed: time = %s, filename = '%s', file descriptor = %d, "
Expand Down Expand Up @@ -871,8 +871,8 @@ H5FD__core_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr
* partial results, and the end of the file.
*/

uint8_t *mem = file->mem; /* memory pointer for writes */
HDoff_t offset = (HDoff_t)0; /* offset for reading */
uint8_t *mem = file->mem; /* memory pointer for writes */
HDoff_t offset = 0; /* offset for reading */

while (size > 0) {
h5_posix_io_t bytes_in = 0; /* # of bytes to read */
Expand Down Expand Up @@ -900,7 +900,7 @@ H5FD__core_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr
int myerrno = errno;
time_t mytime = HDtime(NULL);

offset = HDlseek(file->fd, (HDoff_t)0, SEEK_CUR);
offset = HDlseek(file->fd, 0, SEEK_CUR);

HGOTO_ERROR(
H5E_IO, H5E_READERROR, NULL,
Expand Down
4 changes: 2 additions & 2 deletions src/H5FDdirect.c
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Expand Up @@ -541,7 +541,7 @@ H5FD__direct_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxad
}
else {
file->fa.must_align = false;
if (-1 == HDftruncate(file->fd, (HDoff_t)0))
if (-1 == HDftruncate(file->fd, 0))
HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, NULL, "unable to truncate file")
}
}
Expand All @@ -554,7 +554,7 @@ H5FD__direct_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxad
}
else {
if (o_flags & O_RDWR) {
if (HDlseek(file->fd, (HDoff_t)0, SEEK_SET) < 0)
if (HDlseek(file->fd, 0, SEEK_SET) < 0)
HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, NULL, "unable to seek to proper position")
if (HDwrite(file->fd, buf1, sizeof(int)) < 0)
file->fa.must_align = true;
Expand Down
4 changes: 2 additions & 2 deletions src/H5FDlog.c
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Expand Up @@ -1229,7 +1229,7 @@ H5FD__log_read(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id, had
int myerrno = errno;
time_t mytime = HDtime(NULL);

offset = HDlseek(file->fd, (HDoff_t)0, SEEK_CUR);
offset = HDlseek(file->fd, 0, SEEK_CUR);

if (file->fa.flags & H5FD_LOG_LOC_READ)
fprintf(file->logfp, "Error! Reading: %10" PRIuHADDR "-%10" PRIuHADDR " (%10zu bytes)\n",
Expand Down Expand Up @@ -1448,7 +1448,7 @@ H5FD__log_write(H5FD_t *_file, H5FD_mem_t type, hid_t H5_ATTR_UNUSED dxpl_id, ha
int myerrno = errno;
time_t mytime = HDtime(NULL);

offset = HDlseek(file->fd, (HDoff_t)0, SEEK_CUR);
offset = HDlseek(file->fd, 0, SEEK_CUR);

if (file->fa.flags & H5FD_LOG_LOC_WRITE)
fprintf(file->logfp, "Error! Writing: %10" PRIuHADDR "-%10" PRIuHADDR " (%10zu bytes)\n",
Expand Down
4 changes: 2 additions & 2 deletions src/H5FDsec2.c
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Expand Up @@ -697,7 +697,7 @@ H5FD__sec2_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, hid_t H5_ATTR_UNU
int myerrno = errno;
time_t mytime = HDtime(NULL);

offset = HDlseek(file->fd, (HDoff_t)0, SEEK_CUR);
offset = HDlseek(file->fd, 0, SEEK_CUR);

HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL,
"file read failed: time = %s, filename = '%s', file descriptor = %d, errno = %d, "
Expand Down Expand Up @@ -803,7 +803,7 @@ H5FD__sec2_write(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, hid_t H5_ATTR_UN
int myerrno = errno;
time_t mytime = HDtime(NULL);

offset = HDlseek(file->fd, (HDoff_t)0, SEEK_CUR);
offset = HDlseek(file->fd, 0, SEEK_CUR);

HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
"file write failed: time = %s, filename = '%s', file descriptor = %d, errno = %d, "
Expand Down
2 changes: 1 addition & 1 deletion test/big.c
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Expand Up @@ -143,7 +143,7 @@ is_sparse(void)

if ((fd = HDopen("x.h5", O_RDWR | O_TRUNC | O_CREAT, H5_POSIX_CREATE_MODE_RW)) < 0)
return 0;
if (HDlseek(fd, (HDoff_t)(1024 * 1024), SEEK_SET) != 1024 * 1024)
if (HDlseek(fd, (1024 * 1024), SEEK_SET) != 1024 * 1024)
return 0;
if (5 != HDwrite(fd, "hello", (size_t)5))
return 0;
Expand Down
8 changes: 4 additions & 4 deletions test/enc_dec_plist.c
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Expand Up @@ -220,13 +220,13 @@ main(void)
FAIL_STACK_ERROR;

max_size[0] = 100;
if ((H5Pset_external(dcpl, "ext1.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
if ((H5Pset_external(dcpl, "ext1.data", 0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
FAIL_STACK_ERROR;
if ((H5Pset_external(dcpl, "ext2.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
if ((H5Pset_external(dcpl, "ext2.data", 0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
FAIL_STACK_ERROR;
if ((H5Pset_external(dcpl, "ext3.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
if ((H5Pset_external(dcpl, "ext3.data", 0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
FAIL_STACK_ERROR;
if ((H5Pset_external(dcpl, "ext4.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
if ((H5Pset_external(dcpl, "ext4.data", 0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
FAIL_STACK_ERROR;

/* Test encoding & decoding property list */
Expand Down
8 changes: 4 additions & 4 deletions test/enc_dec_plist_cross_platform.c
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Expand Up @@ -178,8 +178,8 @@ test_plists(const char *filename_prefix)
testfile = H5_get_srcdir_filename(filename);
if ((fd_1 = HDopen(testfile, O_RDONLY)) < 0)
TEST_ERROR;
size_1 = (size_t)HDlseek(fd_1, (HDoff_t)0, SEEK_END);
HDlseek(fd_1, (HDoff_t)0, SEEK_SET);
size_1 = (size_t)HDlseek(fd_1, 0, SEEK_END);
HDlseek(fd_1, 0, SEEK_SET);
buf_1 = (void *)malloc(size_1);
if (HDread(fd_1, buf_1, size_1) < 0)
TEST_ERROR;
Expand All @@ -194,8 +194,8 @@ test_plists(const char *filename_prefix)
testfile = H5_get_srcdir_filename(filename);
if ((fd_2 = HDopen(testfile, O_RDONLY)) < 0)
TEST_ERROR;
size_2 = (size_t)HDlseek(fd_2, (HDoff_t)0, SEEK_END);
HDlseek(fd_2, (HDoff_t)0, SEEK_SET);
size_2 = (size_t)HDlseek(fd_2, 0, SEEK_END);
HDlseek(fd_2, 0, SEEK_SET);
buf_2 = (void *)malloc(size_2);
if (HDread(fd_2, buf_2, size_2) < 0)
TEST_ERROR;
Expand Down
22 changes: 10 additions & 12 deletions test/external.c
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Expand Up @@ -106,7 +106,7 @@ test_non_extendible(hid_t file)
/* Create the dataset and close */
if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
FAIL_STACK_ERROR;
if (H5Pset_external(dcpl, "ext1.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int))) < 0)
if (H5Pset_external(dcpl, "ext1.data", 0, (hsize_t)(max_size[0] * sizeof(int))) < 0)
FAIL_STACK_ERROR;
if ((space = H5Screate_simple(1, cur_size, max_size)) < 0)
FAIL_STACK_ERROR;
Expand Down Expand Up @@ -203,8 +203,7 @@ test_too_small(hid_t file)

if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
FAIL_STACK_ERROR;
if (H5Pset_external(dcpl, "ext1.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int) - 1)) <
0) /* note -1 */
if (H5Pset_external(dcpl, "ext1.data", 0, (hsize_t)(max_size[0] * sizeof(int) - 1)) < 0) /* note -1 */
FAIL_STACK_ERROR;
if ((space = H5Screate_simple(1, cur_size, max_size)) < 0)
FAIL_STACK_ERROR;
Expand Down Expand Up @@ -260,7 +259,7 @@ test_large_enough_current_eventual(hid_t file)

if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
FAIL_STACK_ERROR;
if (H5Pset_external(dcpl, "ext1.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int))) < 0)
if (H5Pset_external(dcpl, "ext1.data", 0, (hsize_t)(max_size[0] * sizeof(int))) < 0)
FAIL_STACK_ERROR;
if ((space = H5Screate_simple(1, cur_size, max_size)) < 0)
FAIL_STACK_ERROR;
Expand Down Expand Up @@ -312,8 +311,7 @@ test_large_enough_current_not_eventual(hid_t file)

if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
FAIL_STACK_ERROR;
if (H5Pset_external(dcpl, "ext1.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int) - 1)) <
0) /* note -1 */
if (H5Pset_external(dcpl, "ext1.data", 0, (hsize_t)(max_size[0] * sizeof(int) - 1)) < 0) /* note -1 */
FAIL_STACK_ERROR;
if ((space = H5Screate_simple(1, cur_size, max_size)) < 0)
FAIL_STACK_ERROR;
Expand Down Expand Up @@ -373,7 +371,7 @@ test_unlimited(hid_t file)
/* Create dataset */
if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
FAIL_STACK_ERROR;
if (H5Pset_external(dcpl, "ext1.data", (off_t)0, H5F_UNLIMITED) < 0)
if (H5Pset_external(dcpl, "ext1.data", 0, H5F_UNLIMITED) < 0)
FAIL_STACK_ERROR;
if ((space = H5Screate_simple(1, cur_size, max_size)) < 0)
FAIL_STACK_ERROR;
Expand Down Expand Up @@ -576,12 +574,12 @@ test_add_to_unlimited(void)

if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
FAIL_STACK_ERROR;
if (H5Pset_external(dcpl, "ext1.data", (off_t)0, H5F_UNLIMITED) < 0)
if (H5Pset_external(dcpl, "ext1.data", 0, H5F_UNLIMITED) < 0)
FAIL_STACK_ERROR;

H5E_BEGIN_TRY
{
status = H5Pset_external(dcpl, "ext2.data", (off_t)0, (hsize_t)100);
status = H5Pset_external(dcpl, "ext2.data", 0, 100);
}
H5E_END_TRY
if (status >= 0)
Expand Down Expand Up @@ -627,12 +625,12 @@ test_overflow(void)

if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
FAIL_STACK_ERROR;
if (H5Pset_external(dcpl, "ext1.data", (off_t)0, H5F_UNLIMITED - 1) < 0)
if (H5Pset_external(dcpl, "ext1.data", 0, H5F_UNLIMITED - 1) < 0)
FAIL_STACK_ERROR;

H5E_BEGIN_TRY
{
status = H5Pset_external(dcpl, "ext2.data", (off_t)0, (hsize_t)100);
status = H5Pset_external(dcpl, "ext2.data", 0, 100);
}
H5E_END_TRY
if (status >= 0)
Expand Down Expand Up @@ -1286,7 +1284,7 @@ test_h5d_get_access_plist(hid_t fapl_id)
/* Create the dcpl and set external storage */
if ((dcpl_id = H5Pcreate(H5P_DATASET_CREATE)) < 0)
FAIL_STACK_ERROR;
if (H5Pset_external(dcpl_id, "extern_1r.raw", (off_t)0, (hsize_t)0) < 0)
if (H5Pset_external(dcpl_id, "extern_1r.raw", 0, 0) < 0)
FAIL_STACK_ERROR;

/* Create the dapl and set the prefix */
Expand Down
2 changes: 1 addition & 1 deletion test/file_image.c
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Expand Up @@ -871,7 +871,7 @@ test_get_file_image(const char *test_banner, const int file_name_num, hid_t fapl
HDoff_t off;

/* Position at userblock */
off = HDlseek(fd, (HDoff_t)USERBLOCK_SIZE, SEEK_SET);
off = HDlseek(fd, USERBLOCK_SIZE, SEEK_SET);
VERIFY(off >= 0, "HDlseek() failed.");
}

Expand Down
2 changes: 1 addition & 1 deletion test/fillval.c
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Expand Up @@ -2098,7 +2098,7 @@ test_extend(hid_t fapl, const char *base_name, H5D_layout_t layout)
if ((fd = HDopen(FILE_NAME_RAW, O_RDWR | O_CREAT | O_TRUNC, H5_POSIX_CREATE_MODE_RW)) < 0 ||
HDclose(fd) < 0)
goto error;
if (H5Pset_external(dcpl, FILE_NAME_RAW, (off_t)0, (hsize_t)nelmts * sizeof(int)) < 0)
if (H5Pset_external(dcpl, FILE_NAME_RAW, 0, (hsize_t)nelmts * sizeof(int)) < 0)
goto error;
}
#endif
Expand Down
12 changes: 6 additions & 6 deletions test/gen_bad_offset.c
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Expand Up @@ -31,11 +31,11 @@
* (A) Open the file:
* fd = HDopen(TESTFILE, O_RDWR, 0663);
* (B) Position the file at:
* (1) HDlseek(fd, (HDoff_t)880, SEEK_SET);
* (1) HDlseek(fd, 880, SEEK_SET);
* "/group1/group2": replace heap offset "8" by bad offset
* (2) HDlseek(fd, (HDoff_t)1512, SEEK_SET);
* (2) HDlseek(fd, 1512, SEEK_SET);
* "/dsetA": replace name offset into private heap "72" by bad offset
* (3) HDlseek(fd, (HDoff_t)1616, SEEK_SET);
* (3) HDlseek(fd, 1616, SEEK_SET);
* /soft_one: replace link value offset in the scratch pad "32" by bad offset
* (C) Write the bad offset value to the file for (1), (2) and (3):
* write(fd, &val, sizeof(val));
Expand Down Expand Up @@ -104,21 +104,21 @@ main(void)
FAIL_STACK_ERROR;

/* Position the file for /group1/group2: replace heap offset "8" by bad offset */
if (HDlseek(fd, (HDoff_t)880, SEEK_SET) < 0)
if (HDlseek(fd, 880, SEEK_SET) < 0)
FAIL_STACK_ERROR;
/* Write the bad offset value to the file */
if (HDwrite(fd, &val, sizeof(val)) < 0)
FAIL_STACK_ERROR;

/* Position the file for /dsetA: replace name offset into private heap "72" by bad offset */
if (HDlseek(fd, (HDoff_t)1512, SEEK_SET) < 0)
if (HDlseek(fd, 1512, SEEK_SET) < 0)
FAIL_STACK_ERROR;
/* Write the bad offset value to the file */
if (HDwrite(fd, &val, sizeof(val)) < 0)
FAIL_STACK_ERROR;

/* Position the file for /soft_one: replace link value offset in the scratch pad "32" by bad offset */
if (HDlseek(fd, (HDoff_t)1616, SEEK_SET) < 0)
if (HDlseek(fd, 1616, SEEK_SET) < 0)
FAIL_STACK_ERROR;
/* Write the bad offset value to the file */
if (HDwrite(fd, &val, sizeof(val)) < 0)
Expand Down
8 changes: 4 additions & 4 deletions test/gen_plist.c
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Expand Up @@ -123,13 +123,13 @@ main(void)
assert(ret > 0);

max_size[0] = 100;
if ((ret = H5Pset_external(dcpl1, "ext1.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
if ((ret = H5Pset_external(dcpl1, "ext1.data", 0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
assert(ret > 0);
if ((ret = H5Pset_external(dcpl1, "ext2.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
if ((ret = H5Pset_external(dcpl1, "ext2.data", 0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
assert(ret > 0);
if ((ret = H5Pset_external(dcpl1, "ext3.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
if ((ret = H5Pset_external(dcpl1, "ext3.data", 0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
assert(ret > 0);
if ((ret = H5Pset_external(dcpl1, "ext4.data", (off_t)0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
if ((ret = H5Pset_external(dcpl1, "ext4.data", 0, (hsize_t)(max_size[0] * sizeof(int) / 4))) < 0)
assert(ret > 0);

if ((ret = encode_plist(dcpl1, little_endian, word_length, "plist_files/dcpl_")) < 0)
Expand Down
2 changes: 1 addition & 1 deletion test/istore.c
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Expand Up @@ -62,7 +62,7 @@ is_sparse(void)

if ((fd = HDopen("x.h5", O_RDWR | O_TRUNC | O_CREAT, H5_POSIX_CREATE_MODE_RW)) < 0)
return 0;
if (HDlseek(fd, (HDoff_t)(1024 * 1024), SEEK_SET) != 1024 * 1024)
if (HDlseek(fd, (1024 * 1024), SEEK_SET) != 1024 * 1024)
return 0;
if (5 != HDwrite(fd, "hello", (size_t)5))
return 0;
Expand Down
2 changes: 1 addition & 1 deletion test/objcopy.c
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Expand Up @@ -5200,7 +5200,7 @@ test_copy_dataset_external(hid_t fcpl_src, hid_t fcpl_dst, hid_t src_fapl, hid_t
size = DIM_SIZE_1 * sizeof(int);
if ((pid = H5Pcreate(H5P_DATASET_CREATE)) < 0)
TEST_ERROR;
if (H5Pset_external(pid, FILE_EXT, (off_t)0, size) < 0)
if (H5Pset_external(pid, FILE_EXT, 0, size) < 0)
TEST_ERROR;

/* create dataset at SRC file */
Expand Down
4 changes: 2 additions & 2 deletions test/set_extent.c
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Expand Up @@ -1831,10 +1831,10 @@ test_external(hid_t fapl, bool use_select_io)
if ((dcpl = H5Pcreate(H5P_DATASET_CREATE)) < 0)
FAIL_STACK_ERROR;

if (H5Pset_external(dcpl, EXT_FILE_NAME1, (off_t)0, size) < 0)
if (H5Pset_external(dcpl, EXT_FILE_NAME1, 0, size) < 0)
FAIL_STACK_ERROR;

if (H5Pset_external(dcpl, EXT_FILE_NAME2, (off_t)0, size) < 0)
if (H5Pset_external(dcpl, EXT_FILE_NAME2, 0, size) < 0)
FAIL_STACK_ERROR;

{
Expand Down
2 changes: 1 addition & 1 deletion test/th5s.c
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Expand Up @@ -933,7 +933,7 @@ test_h5s_zero_dim(void)
* space in the external file is the size of the dataset (zero because one dimension size is zero).
* There's no need to clean up the external file since the library doesn't create it
* until the data is written to it. */
ret = H5Pset_external(plist_id, EXTFILE_NAME, (off_t)0, (hsize_t)0);
ret = H5Pset_external(plist_id, EXTFILE_NAME, 0, (hsize_t)0);
CHECK(ret, FAIL, "H5Pset_external");

ret = H5Pset_alloc_time(plist_id, alloc_time);
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