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<div id="org-div-home-and-up">
<a accesskey="h" href=""> UP </a>
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<a accesskey="H" href="index.html"> HOME </a>
</div><div id="content">
<h1 class="title">HDF5 back end</h1>
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#orgc8ec331">1. HDF5 back end</a>
<ul>
<li><a href="#org69d09a6">1.1. Template for HDF5 definitions</a></li>
<li><a href="#org7054a23">1.2. Template for HDF5 structures</a></li>
<li><a href="#org1521628">1.3. Template for HDF5 init/deinit</a></li>
<li><a href="#orgaf63ee3">1.4. Template for HDF5 has/read/write a number</a></li>
<li><a href="#orgee42d27">1.5. Template for HDF5 has/read/write a dataset</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="outline-container-orgc8ec331" class="outline-2">
<h2 id="orgc8ec331"><span class="section-number-2">1</span> HDF5 back end</h2>
<div class="outline-text-2" id="text-1">
</div>
<div id="outline-container-org69d09a6" class="outline-3">
<h3 id="org69d09a6"><span class="section-number-3">1.1</span> Template for HDF5 definitions</h3>
<div class="outline-text-3" id="text-1-1">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #483d8b;">#define</span> $GROUP$_GROUP_NAME <span style="color: #8b2252;">"$group$"</span>
<span style="color: #483d8b;">#define</span> $GROUP_NUM$_NAME <span style="color: #8b2252;">"$group_num$"</span>
<span style="color: #483d8b;">#define</span> $GROUP$_$GROUP_DSET$_NAME <span style="color: #8b2252;">"$group_dset$"</span>
</pre>
</div>
</div>
</div>
<div id="outline-container-org7054a23" class="outline-3">
<h3 id="org7054a23"><span class="section-number-3">1.2</span> Template for HDF5 structures</h3>
<div class="outline-text-3" id="text-1-2">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #a020f0;">typedef</span> <span style="color: #a020f0;">struct</span> <span style="color: #228b22;">trexio_hdf5_s</span> {
<span style="color: #228b22;">trexio_t</span> <span style="color: #a0522d;">parent</span> ;
<span style="color: #228b22;">hid_t</span> <span style="color: #a0522d;">file_id</span>;
hid_t $group$_group;
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">file_name</span>;
} <span style="color: #228b22;">trexio_hdf5_t</span>;
</pre>
</div>
</div>
</div>
<div id="outline-container-org1521628" class="outline-3">
<h3 id="org1521628"><span class="section-number-3">1.3</span> Template for HDF5 init/deinit</h3>
<div class="outline-text-3" id="text-1-3">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_hdf5_init</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>)
{
<span style="color: #228b22;">trexio_hdf5_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">f</span> = (<span style="color: #228b22;">trexio_hdf5_t</span>*) file;
/* <span style="color: #b22222;">If file doesn't exist, create it </span>*/
<span style="color: #228b22;">int</span> <span style="color: #a0522d;">f_exists</span> = 0;
<span style="color: #a020f0;">struct</span> <span style="color: #228b22;">stat</span> <span style="color: #a0522d;">st</span>;
<span style="color: #a020f0;">if</span> (stat(file-&gt;file_name, &amp;st) == 0) f_exists = 1;
<span style="color: #a020f0;">if</span> (f_exists == 1) {
<span style="color: #a020f0;">switch</span> (file-&gt;mode) {
<span style="color: #a020f0;">case</span> <span style="color: #8b2252;">'r'</span>:
// <span style="color: #b22222;">reading the existing file -&gt; open as RDONLY</span>
f-&gt;file_id = H5Fopen(file-&gt;file_name, H5F_ACC_RDONLY, H5P_DEFAULT);
<span style="color: #a020f0;">break</span>;
<span style="color: #a020f0;">case</span> <span style="color: #8b2252;">'a'</span>:
// <span style="color: #b22222;">appending the existing file -&gt; open as RDWR</span>
f-&gt;file_id = H5Fopen(file-&gt;file_name, H5F_ACC_RDWR, H5P_DEFAULT);
<span style="color: #a020f0;">break</span>;
<span style="color: #a020f0;">case</span> <span style="color: #8b2252;">'w'</span>:
// <span style="color: #b22222;">writing the existing file -&gt; overwrite it (_TRUNC) [_EXCL | H5F_ACC_DEBUG as an alternative]</span>
f-&gt;file_id = H5Fcreate(file-&gt;file_name, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
<span style="color: #a020f0;">break</span>;
}
} <span style="color: #a020f0;">else</span> {
<span style="color: #a020f0;">switch</span> (file-&gt;mode) {
<span style="color: #a020f0;">case</span> <span style="color: #8b2252;">'r'</span>:
<span style="color: #a020f0;">case</span> <span style="color: #8b2252;">'a'</span>:
// <span style="color: #b22222;">reading or appending non-existing file -&gt; error</span>
<span style="color: #a020f0;">return</span> TREXIO_FAILURE;
<span style="color: #a020f0;">case</span> <span style="color: #8b2252;">'w'</span>:
// <span style="color: #b22222;">writing non-existing file -&gt; create it</span>
f-&gt;file_id = H5Fcreate(file-&gt;file_name, H5F_ACC_EXCL, H5P_DEFAULT, H5P_DEFAULT);
<span style="color: #a020f0;">break</span>;
}
}
/* <span style="color: #b22222;">Create or open groups in the hdf5 file assuming that they exist if file exists </span>*/
<span style="color: #a020f0;">switch</span> (file-&gt;mode) {
// <span style="color: #b22222;">the switch for 'r'/'a' is reached only if file exists</span>
<span style="color: #a020f0;">case</span> <span style="color: #8b2252;">'r'</span>:
<span style="color: #a020f0;">case</span> <span style="color: #8b2252;">'a'</span>:
f-&gt;$group$_group = H5Gopen(f-&gt;file_id, $GROUP$_GROUP_NAME, H5P_DEFAULT);
<span style="color: #a020f0;">break</span>;
<span style="color: #a020f0;">case</span> <span style="color: #8b2252;">'w'</span>:
f-&gt;$group$_group = H5Gcreate(f-&gt;file_id, $GROUP$_GROUP_NAME, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
<span style="color: #a020f0;">break</span>;
}
<span style="color: #a020f0;">if</span> (f-&gt;$group$_group &lt;= 0L) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ID;
<span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}
<span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_hdf5_deinit</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>)
{
<span style="color: #228b22;">trexio_hdf5_t</span>* <span style="color: #a0522d;">f</span> = (<span style="color: #228b22;">trexio_hdf5_t</span>*) file;
H5Gclose(f-&gt;$group$_group);
f-&gt;$group$_group = 0;
H5Fclose(f-&gt;file_id);
f-&gt;file_id = 0;
<span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}
</pre>
</div>
</div>
</div>
<div id="outline-container-orgaf63ee3" class="outline-3">
<h3 id="orgaf63ee3"><span class="section-number-3">1.4</span> Template for HDF5 has/read/write a number</h3>
<div class="outline-text-3" id="text-1-4">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_hdf5_read_$group_num$</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>, <span style="color: #228b22;">uint64_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">num</span>)
{
<span style="color: #a020f0;">if</span> (file == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_1;
<span style="color: #a020f0;">if</span> (num == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_2;
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">trexio_hdf5_t</span>* <span style="color: #a0522d;">f</span> = (<span style="color: #a020f0;">const</span> <span style="color: #228b22;">trexio_hdf5_t</span>*) file;
/* <span style="color: #b22222;">Quit if the dimensioning attribute is missing in the file </span>*/
<span style="color: #a020f0;">if</span> (H5Aexists(f-&gt;$group$_group, $GROUP_NUM$_NAME) == 0) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
/* <span style="color: #b22222;">Read the nucleus_num attribute of nucleus group </span>*/
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">hid_t</span> <span style="color: #a0522d;">num_id</span> = H5Aopen(f-&gt;$group$_group, $GROUP_NUM$_NAME, H5P_DEFAULT);
<span style="color: #a020f0;">if</span> (num_id &lt;= 0) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ID;
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">herr_t</span> <span style="color: #a0522d;">status</span> = H5Aread(num_id, H5T_NATIVE_UINT64, num);
<span style="color: #a020f0;">if</span> (status &lt; 0) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
<span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}
</pre>
</div>
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_hdf5_write_$group_num$</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>, <span style="color: #a020f0;">const</span> <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">num</span>)
{
<span style="color: #a020f0;">if</span> (file == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_1;
<span style="color: #a020f0;">if</span> (num == 0L ) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_2;
<span style="color: #228b22;">trexio_hdf5_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">f</span> = (<span style="color: #228b22;">trexio_hdf5_t</span>*) file;
<span style="color: #a020f0;">if</span> (H5Aexists(f-&gt;$group$_group, $GROUP_NUM$_NAME) == 0) {
/* <span style="color: #b22222;">Write the dimensioning variables </span>*/
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">hid_t</span> <span style="color: #a0522d;">dtype</span> = H5Tcopy(H5T_NATIVE_UINT64);
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">hid_t</span> <span style="color: #a0522d;">dspace</span> = H5Screate(H5S_SCALAR);
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">hid_t</span> <span style="color: #a0522d;">num_id</span> = H5Acreate(f-&gt;$group$_group, $GROUP_NUM$_NAME, dtype, dspace,
H5P_DEFAULT, H5P_DEFAULT);
<span style="color: #a020f0;">if</span> (num_id &lt;= 0) {
H5Sclose(dspace);
H5Tclose(dtype);
<span style="color: #a020f0;">return</span> TREXIO_INVALID_ID;
}
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">herr_t</span> <span style="color: #a0522d;">status</span> = H5Awrite(num_id, dtype, &amp;(num));
<span style="color: #a020f0;">if</span> (status &lt; 0) {
H5Aclose(num_id);
H5Sclose(dspace);
H5Tclose(dtype);
<span style="color: #a020f0;">return</span> TREXIO_FAILURE;
}
H5Sclose(dspace);
H5Aclose(num_id);
H5Tclose(dtype);
<span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
} <span style="color: #a020f0;">else</span> {
<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">infile_num</span>;
<span style="color: #228b22;">trexio_exit_code</span> <span style="color: #a0522d;">rc</span> = trexio_hdf5_read_$group_num$(file, &amp;(infile_num));
<span style="color: #a020f0;">if</span> (rc != TREXIO_SUCCESS) <span style="color: #a020f0;">return</span> rc;
<span style="color: #a020f0;">if</span> (infile_num != num) {
<span style="color: #a020f0;">if</span> (infile_num != 0) {
printf(<span style="color: #8b2252;">"%lu -&gt; %lu %s \n"</span>, num, infile_num,
<span style="color: #8b2252;">"This variable already exists. Overwriting it is not supported"</span>);
<span style="color: #a020f0;">return</span> TREXIO_FAILURE;
} <span style="color: #a020f0;">else</span> {
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">hid_t</span> <span style="color: #a0522d;">dtype</span> = H5Tcopy(H5T_NATIVE_UINT64);
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">hid_t</span> <span style="color: #a0522d;">num_id</span> = H5Aopen(f-&gt;$group$_group, $GROUP_NUM$_NAME, H5P_DEFAULT);
<span style="color: #a020f0;">if</span> (num_id &lt;= 0) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ID;
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">herr_t</span> <span style="color: #a0522d;">status</span> = H5Awrite(num_id, dtype, &amp;(num));
<span style="color: #a020f0;">if</span> (status &lt; 0) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
H5Aclose(num_id);
H5Tclose(dtype);
}
}
<span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}
}
</pre>
</div>
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_hdf5_has_$group_num$</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>)
{
<span style="color: #a020f0;">if</span> (file == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_1;
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">trexio_hdf5_t</span>* <span style="color: #a0522d;">f</span> = (<span style="color: #a020f0;">const</span> <span style="color: #228b22;">trexio_hdf5_t</span>*) file;
<span style="color: #228b22;">htri_t</span> <span style="color: #a0522d;">status</span> = H5Aexists(f-&gt;$group$_group, $GROUP_NUM$_NAME);
/* <span style="color: #b22222;">H5Aexists returns positive value if attribute exists, 0 if does not, negative if error </span>*/
<span style="color: #a020f0;">if</span> (status &gt; 0){
<span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
} <span style="color: #a020f0;">else</span> <span style="color: #a020f0;">if</span> (status == 0) {
<span style="color: #a020f0;">return</span> TREXIO_HAS_NOT;
} <span style="color: #a020f0;">else</span> {
<span style="color: #a020f0;">return</span> TREXIO_FAILURE;
}
}
</pre>
</div>
</div>
</div>
<div id="outline-container-orgee42d27" class="outline-3">
<h3 id="orgee42d27"><span class="section-number-3">1.5</span> Template for HDF5 has/read/write a dataset</h3>
<div class="outline-text-3" id="text-1-5">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_hdf5_read_$group$_$group_dset$</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>, $group_dset_dtype$* <span style="color: #a020f0;">const</span> $group_dset$,
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">rank</span>, <span style="color: #a020f0;">const</span> <span style="color: #228b22;">uint64_t</span>* <span style="color: #a0522d;">dims</span>)
{
<span style="color: #a020f0;">if</span> (file == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_1;
<span style="color: #a020f0;">if</span> ($group_dset$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_2;
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">trexio_hdf5_t</span>* <span style="color: #a0522d;">f</span> = (<span style="color: #a020f0;">const</span> <span style="color: #228b22;">trexio_hdf5_t</span>*) file;
<span style="color: #228b22;">herr_t</span> <span style="color: #a0522d;">status</span>;
<span style="color: #228b22;">int</span> <span style="color: #a0522d;">rrank</span>;
// <span style="color: #b22222;">get the rank of the dataset in a file</span>
status = H5LTget_dataset_ndims (f-&gt;$group$_group, $GROUP$_$GROUP_DSET$_NAME, &amp;rrank);
<span style="color: #a020f0;">if</span> (status &lt; 0) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
<span style="color: #a020f0;">if</span> (rrank != (<span style="color: #228b22;">int</span>) rank) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_3;
// <span style="color: #b22222;">open the dataset to get its dimensions</span>
<span style="color: #228b22;">hid_t</span> <span style="color: #a0522d;">dset_id</span> = H5Dopen(f-&gt;$group$_group, $GROUP$_$GROUP_DSET$_NAME, H5P_DEFAULT);
<span style="color: #a020f0;">if</span> (dset_id &lt;= 0) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ID;
// <span style="color: #b22222;">allocate space for the dimensions to be read</span>
<span style="color: #228b22;">hsize_t</span>* <span style="color: #a0522d;">ddims</span> = CALLOC( (<span style="color: #228b22;">int</span>) rank, hsize_t);
<span style="color: #a020f0;">if</span> (ddims == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
// <span style="color: #b22222;">read dimensions from the existing dataset</span>
status = H5LDget_dset_dims(dset_id, ddims);
H5Dclose(dset_id);
<span style="color: #a020f0;">if</span> (status &lt; 0) {
free(ddims);
<span style="color: #a020f0;">return</span> TREXIO_FAILURE;
}
<span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">i</span>=0; i&lt;rank; ++i){
<span style="color: #a020f0;">if</span> (ddims[i] != dims[i]) {
free(ddims);
<span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_4;
}
}
free(ddims);
/* <span style="color: #b22222;">High-level H5LT API. No need to deal with dataspaces and datatypes </span>*/
status = H5LTread_dataset(f-&gt;$group$_group,
$GROUP$_$GROUP_DSET$_NAME,
H5T_NATIVE_$GROUP_DSET_H5_DTYPE$,
$group_dset$);
<span style="color: #a020f0;">if</span> (status &lt; 0) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
<span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}
</pre>
</div>
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_hdf5_write_$group$_$group_dset$</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>, <span style="color: #a020f0;">const</span> $group_dset_dtype$* $group_dset$,
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">rank</span>, <span style="color: #a020f0;">const</span> <span style="color: #228b22;">uint64_t</span>* <span style="color: #a0522d;">dims</span>)
{
<span style="color: #a020f0;">if</span> (file == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_1;
<span style="color: #a020f0;">if</span> ($group_dset$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_2;
<span style="color: #228b22;">trexio_exit_code</span> <span style="color: #a0522d;">rc</span>;
uint64_t $group_dset_dim$;
// <span style="color: #b22222;">error handling for rc is added by the generator</span>
rc = trexio_hdf5_read_$group_dset_dim$(file, &amp;($group_dset_dim$));
<span style="color: #a020f0;">if</span> ($group_dset_dim$ == 0L) <span style="color: #a020f0;">return</span> TREXIO_INVALID_NUM;
<span style="color: #228b22;">trexio_hdf5_t</span>* <span style="color: #a0522d;">f</span> = (<span style="color: #228b22;">trexio_hdf5_t</span>*) file;
<span style="color: #a020f0;">if</span> ( H5LTfind_dataset(f-&gt;$group$_group, $GROUP$_$GROUP_DSET$_NAME) != 1 ) {
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">herr_t</span> <span style="color: #a0522d;">status</span> = H5LTmake_dataset(f-&gt;$group$_group,
$GROUP$_$GROUP_DSET$_NAME,
(<span style="color: #228b22;">int</span>) rank, (<span style="color: #a020f0;">const</span> <span style="color: #228b22;">hsize_t</span>*) dims,
H5T_NATIVE_$GROUP_DSET_H5_DTYPE$,
$group_dset$);
<span style="color: #a020f0;">if</span> (status &lt; 0) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
} <span style="color: #a020f0;">else</span> {
<span style="color: #228b22;">hid_t</span> <span style="color: #a0522d;">dset_id</span> = H5Dopen(f-&gt;$group$_group, $GROUP$_$GROUP_DSET$_NAME, H5P_DEFAULT);
<span style="color: #a020f0;">if</span> (dset_id &lt;= 0) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ID;
<span style="color: #a020f0;">const</span> <span style="color: #228b22;">herr_t</span> <span style="color: #a0522d;">status</span> = H5Dwrite(dset_id,
H5T_NATIVE_$GROUP_DSET_H5_DTYPE$,
H5S_ALL, H5S_ALL, H5P_DEFAULT,
$group_dset$);
H5Dclose(dset_id);
<span style="color: #a020f0;">if</span> (status &lt; 0) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
}
<span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}
</pre>
</div>
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_hdf5_has_$group$_$group_dset$</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>)
{
<span style="color: #a020f0;">if</span> (file == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_1;
<span style="color: #228b22;">trexio_hdf5_t</span>* <span style="color: #a0522d;">f</span> = (<span style="color: #228b22;">trexio_hdf5_t</span>*) file;
<span style="color: #228b22;">herr_t</span> <span style="color: #a0522d;">status</span> = H5LTfind_dataset(f-&gt;$group$_group, $GROUP$_$GROUP_DSET$_NAME);
/* <span style="color: #b22222;">H5LTfind_dataset returns 1 if dataset exists, 0 otherwise </span>*/
<span style="color: #a020f0;">if</span> (status == 1){
<span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
} <span style="color: #a020f0;">else</span> <span style="color: #a020f0;">if</span> (status == 0) {
<span style="color: #a020f0;">return</span> TREXIO_HAS_NOT;
} <span style="color: #a020f0;">else</span> {
<span style="color: #a020f0;">return</span> TREXIO_FAILURE;
}
}
</pre>
</div>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="author">Author: TREX-CoE</p>
<p class="date">Created: 2021-05-06 Thu 07:37</p>
<p class="validation"><a href="http://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
</body>
</html>