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<div id="org-div-home-and-up">
 <a accesskey="h" href=""> UP </a>
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</div><div id="content" class="content">
<h1 class="title">TEXT back end</h1>
<div id="table-of-contents" role="doc-toc">
<h2>Table of Contents</h2>
<div id="text-table-of-contents" role="doc-toc">
<ul>
<li><a href="#org0cf1cc7">1. Template for group-related structures in text back end</a></li>
<li><a href="#org4c9b714">2. Template for general structure in text back end</a></li>
<li><a href="#orgc3710cd">3. Initialize function (constant part)</a></li>
<li><a href="#org5b888f3">4. Deinitialize function (templated part)</a></li>
<li><a href="#org5601d7a">5. Flush function (templated part)</a></li>
<li><a href="#orgf95a3f6">6. Template for text read a group</a></li>
<li><a href="#org0600582">7. Template for text has a group</a></li>
<li><a href="#org758ffb2">8. Template for text flush a group</a></li>
<li><a href="#org48ef6cf">9. Template for text free memory</a></li>
<li><a href="#orgcd0b080">10. Template for has/read/write a numerical attribute</a></li>
<li><a href="#orgde379cb">11. Template for has/read/write a dataset of numerical data</a></li>
<li><a href="#org234bb91">12. Template for has/read/write a dataset of strings</a></li>
<li><a href="#org3bb6e41">13. Template for has/read/write a string attribute</a></li>
<li><a href="#orgad857be">14. Template for has/read/write the dataset of sparse data</a></li>
<li><a href="#org653d0b0">15. Template for text delete a group (UNSAFE mode)</a></li>
<li><a href="#org85b8a1d">16. Source code for the determinant part</a></li>
</ul>
</div>
</div>
<p>
The "file" produced by the text back end is a directory with one
file per group.
</p>

<p>
When the file is open, it is locked by the current process. No other
process can read/write the same file. This guarantees that the
representation in memory is consistent with the file and avoid
re-reading the file before writing.
To lock the file, we lock the <code>.lock</code> file which is present in the
directory.
</p>

<p>
The file is written when closed, or when the flush function is called.
</p>

<div id="outline-container-org0cf1cc7" class="outline-2">
<h2 id="org0cf1cc7"><span class="section-number-2">1.</span> Template for group-related structures in text back end</h2>
<div class="outline-text-2" id="text-1">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #a020f0;">typedef</span> <span style="color: #a020f0;">struct</span> $group$_s {
  $group_num_dtype_double$ $group_num$;
  $group_dset_dtype$*  $group_dset$;
  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">dims_$group_dset$</span>[16];
  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">len_$group_str$</span>;
  <span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">rank_$group_dset$</span>;
  <span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">to_flush</span>;
  bool $group_num$_isSet;
  <span style="color: #228b22;">char</span>*    $group_str$;
  <span style="color: #228b22;">char</span>     <span style="color: #a0522d;">file_name</span>[TREXIO_MAX_FILENAME_LENGTH];
} $group$_t;
</pre>
</div>
</div>
</div>

<div id="outline-container-org4c9b714" class="outline-2">
<h2 id="org4c9b714"><span class="section-number-2">2.</span> Template for general structure in text back end</h2>
<div class="outline-text-2" id="text-2">
<p>
Polymorphism of the <code>trexio_t</code> type is handled by ensuring that the
corresponding types for all back ends can be safely casted to
<code>trexio_t</code>. This is done by making the back-end structs start with
<code>trexio_t parent</code> attribute:
</p>

<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_text_s</span> {
  <span style="color: #228b22;">trexio_t</span>   <span style="color: #a0522d;">parent</span> ;
  $group$_t* $group$;
  <span style="color: #228b22;">int</span>        <span style="color: #a0522d;">lock_file</span>;
} <span style="color: #228b22;">trexio_text_t</span>;
</pre>
</div>
</div>
</div>

<div id="outline-container-orgc3710cd" class="outline-2">
<h2 id="orgc3710cd"><span class="section-number-2">3.</span> Initialize function (constant part)</h2>
<div class="outline-text-2" id="text-3">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">bool</span>
<span style="color: #0000ff;">trexio_text_file_exists</span> (<span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">file_name</span>)
{
  /* <span style="color: #b22222;">Check if the file with "file_name" exists </span>*/
  <span style="color: #a020f0;">struct</span> <span style="color: #228b22;">stat</span> <span style="color: #a0522d;">st</span>;

  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span> = stat(file_name, &amp;st);

  <span style="color: #228b22;">bool</span> <span style="color: #a0522d;">file_exists</span> = rc == 0;

  <span style="color: #a020f0;">return</span> file_exists;
}
</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_text_inquire</span> (<span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">file_name</span>)
{
  /* <span style="color: #b22222;">Check if the file with "file_name" exists and that it is a directory </span>*/
  <span style="color: #a020f0;">struct</span> <span style="color: #228b22;">stat</span> <span style="color: #a0522d;">st</span>;

  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span> = stat(file_name, &amp;st);

  <span style="color: #228b22;">bool</span> <span style="color: #a0522d;">file_exists</span> = rc == 0;

  <span style="color: #a020f0;">if</span> (file_exists) {

    <span style="color: #228b22;">bool</span> <span style="color: #a0522d;">is_a_directory</span> = <span style="color: #008b8b;">false</span>;
<span style="color: #483d8b;">#ifdef</span> S_IFDIR
    is_a_directory = st.st_mode &amp; S_IFDIR;
<span style="color: #483d8b;">#elif</span> S_ISDIR
    is_a_directory = S_ISDIR(s.st_mode);
<span style="color: #483d8b;">#else</span>
    printf(<span style="color: #8b2252;">"Some important macros are missing for directory handling.\n"</span>);
    <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
<span style="color: #483d8b;">#endif</span>
    <span style="color: #a020f0;">if</span> (!is_a_directory) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

    <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
  } <span style="color: #a020f0;">else</span> {
    <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
  }
}
</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_text_init</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_text_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">f</span> = (<span style="color: #228b22;">trexio_text_t</span>*) file;

  /* <span style="color: #b22222;">Put all pointers to NULL but leave parent untouched </span>*/
  memset(&amp;(f-&gt;parent)+1,0,<span style="color: #a020f0;">sizeof</span>(trexio_text_t)-<span style="color: #a020f0;">sizeof</span>(trexio_t));

  /* <span style="color: #b22222;">Check if directory exists </span>*/
  <span style="color: #228b22;">trexio_exit_code</span> <span style="color: #a0522d;">rc</span>;
  rc = trexio_text_inquire(file-&gt;file_name);
  /* <span style="color: #b22222;">TREXIO file exists but is not  a directory </span>*/
  <span style="color: #a020f0;">if</span> (rc == TREXIO_FILE_ERROR) <span style="color: #a020f0;">return</span> rc;
  /* <span style="color: #b22222;">If directory does not exist - create it in write mode </span>*/
  <span style="color: #a020f0;">if</span> (rc == TREXIO_FAILURE) {

    <span style="color: #a020f0;">if</span> (file-&gt;mode == <span style="color: #8b2252;">'r'</span>) <span style="color: #a020f0;">return</span> TREXIO_READONLY;

    <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc_dir</span> = mkdir(file-&gt;file_name, 0777);
    <span style="color: #a020f0;">if</span> (rc_dir != 0) <span style="color: #a020f0;">return</span> TREXIO_ERRNO;

  }

  /* <span style="color: #b22222;">Create the lock file in the directory </span>*/
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">lock_file_name</span> = <span style="color: #8b2252;">"/.lock"</span>;

  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_name</span>[TREXIO_MAX_FILENAME_LENGTH];

  strncpy (file_name, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  strncat (file_name, lock_file_name, TREXIO_MAX_FILENAME_LENGTH-strlen(lock_file_name));

  <span style="color: #a020f0;">if</span> (file_name[TREXIO_MAX_FILENAME_LENGTH-1] != <span style="color: #8b2252;">'\0'</span>) {
    <span style="color: #a020f0;">return</span> TREXIO_LOCK_ERROR;
  }

  f-&gt;lock_file = open(file_name,O_WRONLY|O_CREAT|O_TRUNC, 0644);

  <span style="color: #a020f0;">if</span> (f-&gt;lock_file &lt;= 0) {
    <span style="color: #a020f0;">if</span> (file-&gt;mode != <span style="color: #8b2252;">'r'</span>) {
      <span style="color: #a020f0;">return</span> TREXIO_ERRNO;
    } <span style="color: #a020f0;">else</span> {
      <span style="color: #a020f0;">if</span> (errno == EACCES) {
        /* <span style="color: #b22222;">The directory is read-only and the lock file can't be written.</span>
<span style="color: #b22222;">          Create a dummy temporary file for dummy locking.</span>
<span style="color: #b22222;">        </span>*/
        <span style="color: #228b22;">char</span> <span style="color: #a0522d;">dirname</span>[TREXIO_MAX_FILENAME_LENGTH] = <span style="color: #8b2252;">"/tmp/trexio.XXXXXX"</span>;
        <span style="color: #a020f0;">if</span> (mkdtemp(dirname) == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_ERRNO;
        strncpy (file_name, dirname, TREXIO_MAX_FILENAME_LENGTH);
        strncat (file_name, lock_file_name, TREXIO_MAX_FILENAME_LENGTH-strlen(lock_file_name));
        f-&gt;lock_file = open(file_name,O_WRONLY|O_CREAT|O_TRUNC, 0644);
        remove(file_name);
        rmdir(dirname);
      } <span style="color: #a020f0;">else</span> {
        <span style="color: #a020f0;">return</span> TREXIO_ERRNO;
      }
    }
  }

  <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_text_lock</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_text_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">f</span> = (<span style="color: #228b22;">trexio_text_t</span>*) file;

  <span style="color: #a020f0;">struct</span> <span style="color: #228b22;">flock</span> <span style="color: #a0522d;">fl</span>;

  fl.l_type   = F_WRLCK;
  fl.l_whence = SEEK_SET;
  fl.l_start  = 0;
  fl.l_len    = 0;
  fl.l_pid    = getpid();

  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span> = fcntl(f-&gt;lock_file, F_SETLKW, &amp;fl);
  <span style="color: #a020f0;">if</span> (rc == -1) <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_text_unlock</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_text_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">f</span> = (<span style="color: #228b22;">trexio_text_t</span>*) file;

  <span style="color: #a020f0;">struct</span> <span style="color: #228b22;">flock</span> <span style="color: #a0522d;">fl</span>;

  fl.l_type   = F_UNLCK;
  fl.l_whence = SEEK_SET;
  fl.l_start  = 0;
  fl.l_len    = 0;
  fl.l_pid    = getpid();
  fcntl(f-&gt;lock_file, F_SETLK, &amp;fl);

  close(f-&gt;lock_file);
  <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;

}
</pre>
</div>
</div>
</div>

<div id="outline-container-org5b888f3" class="outline-2">
<h2 id="org5b888f3"><span class="section-number-2">4.</span> Deinitialize function (templated part)</h2>
<div class="outline-text-2" id="text-4">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_deinit</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_exit_code</span> <span style="color: #a0522d;">rc</span>;

  /* <span style="color: #b22222;">Error handling for this call is added by the generator </span>*/
  rc = trexio_text_free_$group$( (<span style="color: #228b22;">trexio_text_t</span>*) file);

  <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;

}
</pre>
</div>
</div>
</div>

<div id="outline-container-org5601d7a" class="outline-2">
<h2 id="org5601d7a"><span class="section-number-2">5.</span> Flush function (templated part)</h2>
<div class="outline-text-2" id="text-5">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_flush</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_exit_code</span> <span style="color: #a0522d;">rc</span>;
  <span style="color: #228b22;">trexio_text_t</span>* <span style="color: #a0522d;">f</span> = (<span style="color: #228b22;">trexio_text_t</span>*) file;

  /* <span style="color: #b22222;">Error handling for this call is added by the generator </span>*/
  rc = trexio_text_flush_$group$(f);

  <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;

}
</pre>
</div>
</div>
</div>

<div id="outline-container-orgf95a3f6" class="outline-2">
<h2 id="orgf95a3f6"><span class="section-number-2">6.</span> Template for text read a group</h2>
<div class="outline-text-2" id="text-6">
<div class="org-src-container">
<pre class="src src-c">$group$_t*
trexio_text_read_$group$ (<span style="color: #228b22;">trexio_text_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> <span style="color: #008b8b;">NULL</span>;

  /* <span style="color: #b22222;">If the data structure exists, return it </span>*/
  <span style="color: #a020f0;">if</span> (file-&gt;$group$ != <span style="color: #008b8b;">NULL</span>) {
    <span style="color: #a020f0;">return</span> file-&gt;$group$;
  }

  /* <span style="color: #b22222;">Allocate the data structure </span>*/
  $group$_t* $group$ = MALLOC($group$_t);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;

  memset($group$,0,<span style="color: #a020f0;">sizeof</span>($group$_t));

  /* <span style="color: #b22222;">Build the file name </span>*/
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* $group$_file_name = <span style="color: #8b2252;">"/$group$.txt"</span>;

  strncpy ($group$-&gt;file_name, file-&gt;parent.file_name, TREXIO_MAX_FILENAME_LENGTH);
  strncat ($group$-&gt;file_name, $group$_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen($group$_file_name));

  <span style="color: #a020f0;">if</span> ($group$-&gt;file_name[TREXIO_MAX_FILENAME_LENGTH-1] != <span style="color: #8b2252;">'\0'</span>) {
    FREE($group$);
    <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
  }

  /* <span style="color: #b22222;">If the file exists, read it </span>*/
  <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">f</span> = fopen($group$-&gt;file_name,<span style="color: #8b2252;">"r"</span>);
  <span style="color: #a020f0;">if</span> (f != <span style="color: #008b8b;">NULL</span>) {

    /* <span style="color: #b22222;">Find size of file to allocate the max size of the string buffer </span>*/
    fseek(f, 0L, SEEK_END);
    <span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">sz</span> = ftell(f);
    fseek(f, 0L, SEEK_SET);

    sz = (sz &lt; 1024) ? (1024) : (sz);
    <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">buffer</span> = CALLOC(sz, <span style="color: #228b22;">char</span>);
    <span style="color: #a020f0;">if</span> (buffer == <span style="color: #008b8b;">NULL</span>) {
      fclose(f);
      FREE($group$);
      <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
    }

    <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span> = 0;
    <span style="color: #228b22;">trexio_exit_code</span> <span style="color: #a0522d;">rc_free</span> = TREXIO_FAILURE;

    /* <span style="color: #b22222;">workaround for the case of missing blocks in the file </span>*/
    // <span style="color: #b22222;">START REPEAT GROUP_DSET_ALL</span>
    <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">size_$group_dset$</span> = 0;
    // <span style="color: #b22222;">END REPEAT GROUP_DSET_ALL</span>

    <span style="color: #a020f0;">while</span>(fscanf(f, <span style="color: #8b2252;">"%1023s"</span>, buffer) != EOF) {

      <span style="color: #a020f0;">if</span> (strcmp(buffer, <span style="color: #8b2252;">"EXIT"</span>) == 0) {
        <span style="color: #a020f0;">break</span>;
      // <span style="color: #b22222;">START REPEAT GROUP_DSET_ALL</span>
      } <span style="color: #a020f0;">else</span> <span style="color: #a020f0;">if</span> (strcmp(buffer, <span style="color: #8b2252;">"rank_$group_dset$"</span>) == 0) {

        rc = fscanf(f, <span style="color: #8b2252;">"%u"</span>, &amp;($group$-&gt;rank_$group_dset$));
        <span style="color: #a020f0;">if</span> (rc != 1) {
          trexio_text_free_read_$group$(buffer, f, file, $group$);
          <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
        }

        <span style="color: #a020f0;">if</span> ($group$-&gt;rank_$group_dset$ != 0) size_$group_dset$ = 1UL;

        <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">i</span>=0; i&lt;$group$-&gt;rank_$group_dset$; ++i){

          <span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">j</span>=0;
          rc = fscanf(f, <span style="color: #8b2252;">"%1023s %u"</span>, buffer, &amp;j);
          <span style="color: #a020f0;">if</span> ((rc != 2) || (strcmp(buffer, <span style="color: #8b2252;">"dims_$group_dset$"</span>) != 0) || (j!=i)) {
            trexio_text_free_read_$group$(buffer, f, file, $group$);
            <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
          }

          rc = fscanf(f, <span style="color: #8b2252;">"%"</span> SCNu64 <span style="color: #8b2252;">"\n"</span>, &amp;($group$-&gt;dims_$group_dset$[i]));
          assert(!(rc != 1));
          <span style="color: #a020f0;">if</span> (rc != 1) {
            trexio_text_free_read_$group$(buffer, f, file, $group$);
            <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
          }

          size_$group_dset$ *= $group$-&gt;dims_$group_dset$[i];
        }
      // <span style="color: #b22222;">END REPEAT GROUP_DSET_ALL</span>
      // <span style="color: #b22222;">START REPEAT GROUP_DSET_NUM</span>
      } <span style="color: #a020f0;">else</span> <span style="color: #a020f0;">if</span> (strcmp(buffer, <span style="color: #8b2252;">"$group_dset$"</span>) == 0) {

        /* <span style="color: #b22222;">Allocate arrays </span>*/
        $group$-&gt;$group_dset$ = CALLOC(size_$group_dset$, $group_dset_dtype$);
        <span style="color: #a020f0;">if</span> ($group$-&gt;$group_dset$ == <span style="color: #008b8b;">NULL</span>) {
          trexio_text_free_read_$group$(buffer, f, file, $group$);
          <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
        }

        <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0 ; i&lt;size_$group_dset$ ; ++i) {
          rc = fscanf(f, <span style="color: #8b2252;">"%$group_dset_format_scanf$"</span>, &amp;($group$-&gt;$group_dset$[i]));
          <span style="color: #a020f0;">if</span> (rc != 1) {
            trexio_text_free_read_$group$(buffer, f, file, $group$);
            <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
          }
        }

      // <span style="color: #b22222;">END REPEAT GROUP_DSET_NUM</span>
      // <span style="color: #b22222;">START REPEAT GROUP_DSET_STR</span>
      } <span style="color: #a020f0;">else</span> <span style="color: #a020f0;">if</span> (strcmp(buffer, <span style="color: #8b2252;">"$group_dset$"</span>) == 0) {

        <span style="color: #a020f0;">if</span> (size_$group_dset$ != 0) {
          /* <span style="color: #b22222;">Allocate arrays </span>*/
          $group$-&gt;$group_dset$ = CALLOC(size_$group_dset$, $group_dset_dtype$);
          <span style="color: #a020f0;">if</span> ($group$-&gt;$group_dset$ == <span style="color: #008b8b;">NULL</span>) {
            trexio_text_free_read_$group$(buffer, f, file, $group$);
            <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
          }

          /* <span style="color: #b22222;">WARNING: this tmp array allows to avoid allocation of space for each element of array of string</span>
<span style="color: #b22222;">           * BUT it's size has to be number_of_str*max_len_str where max_len_str is somewhat arbitrary, e.g. 32.</span>
<span style="color: #b22222;">           </span>*/
          <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">tmp_$group_dset$</span>;
          tmp_$group_dset$ = CALLOC(size_$group_dset$*32, <span style="color: #228b22;">char</span>);

          <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0 ; i&lt;size_$group_dset$ ; ++i) {
            $group$-&gt;$group_dset$[i] = tmp_$group_dset$;
            /* <span style="color: #b22222;">conventional fcanf with "%s" only return the string before the first space character</span>
<span style="color: #b22222;">             * to read string with spaces use "%[^\n]" possible with space before or after, i.e. " %[^\n]"</span>
<span style="color: #b22222;">             </span>*/
            rc = fscanf(f, <span style="color: #8b2252;">" %1023[^\n]"</span>, buffer);
            <span style="color: #a020f0;">if</span> (rc != 1) {
              trexio_text_free_read_$group$(buffer, f, file, $group$);
              <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
            }

            <span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">tmp_$group_dset$_len</span> = strlen(buffer);
            strncpy(tmp_$group_dset$, buffer, 32);
            tmp_$group_dset$ += tmp_$group_dset$_len + 1;
          }
        }

      // <span style="color: #b22222;">END REPEAT GROUP_DSET_STR</span>
      // <span style="color: #b22222;">START REPEAT GROUP_NUM</span>
      } <span style="color: #a020f0;">else</span> <span style="color: #a020f0;">if</span> (strcmp(buffer, <span style="color: #8b2252;">"$group_num$_isSet"</span>) == 0) {

        <span style="color: #228b22;">unsigned</span> <span style="color: #228b22;">int</span> $group_num$_isSet;
        /* <span style="color: #b22222;">additional parameter $group_num$_isSet is needed to suppress warning when fscanf into bool variable using %u or %d </span>*/
        rc = fscanf(f, <span style="color: #8b2252;">"%u"</span>, &amp;($group_num$_isSet));
        $group$-&gt;$group_num$_isSet = (bool) $group_num$_isSet;
        <span style="color: #a020f0;">if</span> (rc != 1) {
          trexio_text_free_read_$group$(buffer, f, file, $group$);
          <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
        }

        <span style="color: #a020f0;">if</span> ($group$-&gt;$group_num$_isSet == <span style="color: #008b8b;">true</span>) {

          rc = fscanf(f, <span style="color: #8b2252;">"%1023s"</span>, buffer);
          <span style="color: #a020f0;">if</span> ((rc != 1) || (strcmp(buffer, <span style="color: #8b2252;">"$group_num$"</span>) != 0)) {
            trexio_text_free_read_$group$(buffer, f, file, $group$);
            <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
          }

          rc = fscanf(f, <span style="color: #8b2252;">"%$group_num_format_scanf$"</span>, &amp;($group$-&gt;$group_num$));
          <span style="color: #a020f0;">if</span> (rc != 1) {
            trexio_text_free_read_$group$(buffer, f, file, $group$);
            <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
          }

        }

      // <span style="color: #b22222;">END REPEAT GROUP_NUM</span>
      // <span style="color: #b22222;">START REPEAT GROUP_ATTR_STR</span>
      } <span style="color: #a020f0;">else</span> <span style="color: #a020f0;">if</span> (strcmp(buffer, <span style="color: #8b2252;">"len_$group_str$"</span>) == 0) {

        rc = fscanf(f, <span style="color: #8b2252;">"%"</span> SCNu64 <span style="color: #8b2252;">""</span>, &amp;($group$-&gt;len_$group_str$));
        <span style="color: #a020f0;">if</span> (rc != 1) {
          trexio_text_free_read_$group$(buffer, f, file, $group$);
          <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
        }

        rc = fscanf(f, <span style="color: #8b2252;">"%1023s"</span>, buffer);
        <span style="color: #a020f0;">if</span> ((rc != 1) || (strcmp(buffer, <span style="color: #8b2252;">"$group_str$"</span>) != 0)) {
          trexio_text_free_read_$group$(buffer, f, file, $group$);
          <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
        }

        <span style="color: #a020f0;">if</span> ($group$-&gt;len_$group_str$ != 0) {

          $group$-&gt;$group_str$ = CALLOC($group$-&gt;len_$group_str$, <span style="color: #228b22;">char</span>);
          <span style="color: #a020f0;">if</span> ($group$-&gt;$group_str$ == <span style="color: #008b8b;">NULL</span>) {
            trexio_text_free_read_$group$(buffer, f, file, $group$);
            <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
          }

          rc = fscanf(f, <span style="color: #8b2252;">" %1023[^\n]"</span>, buffer);
          <span style="color: #a020f0;">if</span> (rc != 1) {
            trexio_text_free_read_$group$(buffer, f, file, $group$);
            <span style="color: #a020f0;">return</span> <span style="color: #008b8b;">NULL</span>;
          }
          /* <span style="color: #b22222;">Safer string conversion to avoid buffer overflow in fscanf </span>*/
          strncpy($group$-&gt;$group_str$, buffer, $group$-&gt;len_$group_str$);

        }
      // <span style="color: #b22222;">END REPEAT GROUP_ATTR_STR</span>
      } <span style="color: #a020f0;">else</span> {
        <span style="color: #a020f0;">continue</span>;
      }

    }

    FREE(buffer);
    fclose(f);
    f = <span style="color: #008b8b;">NULL</span>;
  }

  file-&gt;$group$ = $group$;
  <span style="color: #a020f0;">return</span> $group$;
}
</pre>
</div>
</div>
</div>

<div id="outline-container-org0600582" class="outline-2">
<h2 id="org0600582"><span class="section-number-2">7.</span> Template for text has a group</h2>
<div class="outline-text-2" id="text-7">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_has_$group$</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: #b22222;">Flush the group to make sure the group.txt file is created </span>*/
  <span style="color: #a020f0;">if</span> (file-&gt;mode != <span style="color: #8b2252;">'r'</span>) {
    <span style="color: #228b22;">trexio_exit_code</span> <span style="color: #a0522d;">rc</span> = trexio_text_flush_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
    <span style="color: #a020f0;">if</span> (rc != TREXIO_SUCCESS) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
  }

  /* <span style="color: #b22222;">Build the file name </span>*/
  <span style="color: #228b22;">char</span> $group$_full_path[TREXIO_MAX_FILENAME_LENGTH];

  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span>* $group$_file_name = <span style="color: #8b2252;">"/$group$.txt"</span>;

  strncpy ($group$_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  strncat ($group$_full_path, $group$_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen($group$_file_name));

  <span style="color: #a020f0;">if</span> ($group$_full_path[TREXIO_MAX_FILENAME_LENGTH-1] != <span style="color: #8b2252;">'\0'</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #228b22;">bool</span> <span style="color: #a0522d;">file_exists</span>;
  file_exists = trexio_text_file_exists($group$_full_path);

  <span style="color: #a020f0;">if</span> (file_exists) {
    <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
  } <span style="color: #a020f0;">else</span> {
    <span style="color: #a020f0;">return</span> TREXIO_HAS_NOT;
  }
}
</pre>
</div>
</div>
</div>

<div id="outline-container-org758ffb2" class="outline-2">
<h2 id="org758ffb2"><span class="section-number-2">8.</span> Template for text flush a group</h2>
<div class="outline-text-2" id="text-8">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_flush_$group$</span> (<span style="color: #228b22;">trexio_text_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;">if</span> (file-&gt;parent.mode == <span style="color: #8b2252;">'r'</span>) <span style="color: #a020f0;">return</span> TREXIO_READONLY;

  $group$_t* $group$ = file-&gt;$group$;
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;

  <span style="color: #a020f0;">if</span> ($group$-&gt;to_flush == 0) <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;

  assert (file-&gt;parent.mode == <span style="color: #8b2252;">'w'</span> || file-&gt;parent.mode == <span style="color: #8b2252;">'u'</span>);

  <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">f</span> = fopen($group$-&gt;file_name, <span style="color: #8b2252;">"w"</span>);
  <span style="color: #a020f0;">if</span> (f == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_1;

  /* <span style="color: #b22222;">Write the dimensioning variables </span>*/
  // <span style="color: #b22222;">START REPEAT GROUP_DSET_ALL</span>
  fprintf(f, <span style="color: #8b2252;">"rank_$group_dset$ %u\n"</span>, $group$-&gt;rank_$group_dset$);
  // <span style="color: #b22222;">workaround for the case of missing blocks in the file</span>
  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">size_$group_dset$</span> = 0;
  <span style="color: #a020f0;">if</span> ($group$-&gt;rank_$group_dset$ != 0) size_$group_dset$ = 1;

  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">unsigned</span> <span style="color: #228b22;">int</span> <span style="color: #a0522d;">i</span>=0; i&lt;$group$-&gt;rank_$group_dset$; ++i){
    fprintf(f, <span style="color: #8b2252;">"dims_$group_dset$ %u %"</span> PRIu64 <span style="color: #8b2252;">"\n"</span>, i, $group$-&gt;dims_$group_dset$[i]);
    size_$group_dset$ *= $group$-&gt;dims_$group_dset$[i];
  }
  // <span style="color: #b22222;">END REPEAT GROUP_DSET_ALL</span>

  // <span style="color: #b22222;">START REPEAT GROUP_NUM</span>
  fprintf(f, <span style="color: #8b2252;">"$group_num$_isSet %u \n"</span>, $group$-&gt;$group_num$_isSet);
  <span style="color: #a020f0;">if</span> ($group$-&gt;$group_num$_isSet == <span style="color: #008b8b;">true</span>) fprintf(f, <span style="color: #8b2252;">"$group_num$ %$group_num_format_printf$ \n"</span>, $group$-&gt;$group_num$);
  // <span style="color: #b22222;">END REPEAT GROUP_NUM</span>

  // <span style="color: #b22222;">START REPEAT GROUP_ATTR_STR</span>
  fprintf(f, <span style="color: #8b2252;">"len_$group_str$ %"</span> PRIu64 <span style="color: #8b2252;">"\n"</span>, $group$-&gt;len_$group_str$);
  fprintf(f, <span style="color: #8b2252;">"$group_str$\n"</span>);
  <span style="color: #a020f0;">if</span> ($group$-&gt;len_$group_str$ != 0) fprintf(f, <span style="color: #8b2252;">"%s\n"</span>, $group$-&gt;$group_str$);
  // <span style="color: #b22222;">END REPEAT GROUP_ATTR_STR</span>

  /* <span style="color: #b22222;">Write arrays </span>*/
  // <span style="color: #b22222;">START REPEAT GROUP_DSET_ALL</span>

  fprintf(f, <span style="color: #8b2252;">"$group_dset$\n"</span>);
  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0 ; i&lt;size_$group_dset$ ; ++i) {
    fprintf(f, <span style="color: #8b2252;">"%$group_dset_format_printf$\n"</span>, $group$-&gt;$group_dset$[i]);
  }
  // <span style="color: #b22222;">END REPEAT GROUP_DSET_ALL</span>

  fclose(f);
  $group$-&gt;to_flush = 0;
  <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;

}
</pre>
</div>
</div>
</div>

<div id="outline-container-org48ef6cf" class="outline-2">
<h2 id="org48ef6cf"><span class="section-number-2">9.</span> Template for text free memory</h2>
<div class="outline-text-2" id="text-9">
<p>
Memory is allocated when reading. The following function frees memory.
</p>

<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_free_$group$</span> (<span style="color: #228b22;">trexio_text_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;">if</span> (file-&gt;parent.mode != <span style="color: #8b2252;">'r'</span>) {
    <span style="color: #228b22;">trexio_exit_code</span> <span style="color: #a0522d;">rc</span> = trexio_text_flush_$group$(file);
    <span style="color: #a020f0;">if</span> (rc != TREXIO_SUCCESS) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
  }

  $group$_t* $group$ = file-&gt;$group$;
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;

  // <span style="color: #b22222;">START REPEAT GROUP_DSET_NUM</span>
  <span style="color: #a020f0;">if</span> ($group$-&gt;$group_dset$ != <span style="color: #008b8b;">NULL</span>) FREE ($group$-&gt;$group_dset$);
  // <span style="color: #b22222;">END REPEAT GROUP_DSET_NUM</span>

  // <span style="color: #b22222;">START REPEAT GROUP_DSET_STR</span>
  <span style="color: #a020f0;">if</span> ($group$-&gt;$group_dset$ != <span style="color: #008b8b;">NULL</span>) {
    <span style="color: #a020f0;">if</span> ($group$-&gt;rank_$group_dset$ != 0) FREE ($group$-&gt;$group_dset$[0]);
    FREE ($group$-&gt;$group_dset$);
  }
  // <span style="color: #b22222;">END REPEAT GROUP_DSET_STR</span>

  // <span style="color: #b22222;">START REPEAT GROUP_ATTR_STR</span>
  <span style="color: #a020f0;">if</span> ($group$-&gt;$group_str$ != <span style="color: #008b8b;">NULL</span>) FREE ($group$-&gt;$group_str$);
  // <span style="color: #b22222;">END REPEAT GROUP_ATTR_STR</span>

  FREE ($group$);
  file-&gt;$group$ = <span style="color: #008b8b;">NULL</span>;

  <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;

}
</pre>
</div>

<p>
This function is called upon the non-successful exit from the <code>trexio_text_read_group</code> function.
</p>

<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_free_read_$group$</span> (<span style="color: #228b22;">char</span>* <span style="color: #a0522d;">buffer</span>, <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">txt_file</span>, <span style="color: #228b22;">trexio_text_t</span>* <span style="color: #a0522d;">trexio_file</span>, $group$_t* $group$)
{
  <span style="color: #228b22;">trexio_exit_code</span> <span style="color: #a0522d;">rc_free</span>;

  FREE(buffer);
  fclose(txt_file);
  /* <span style="color: #b22222;">Set pointer to the struct so that the garbage collector can do the job on file handle </span>*/
  trexio_file-&gt;$group$ = $group$;
  rc_free = trexio_text_free_$group$(trexio_file);
  assert(rc_free == TREXIO_SUCCESS);

  <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}
</pre>
</div>
</div>
</div>

<div id="outline-container-orgcd0b080" class="outline-2">
<h2 id="orgcd0b080"><span class="section-number-2">10.</span> Template for has/read/write a numerical attribute</h2>
<div class="outline-text-2" id="text-10">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_read_$group_num$</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>, $group_num_dtype_double$* <span style="color: #a020f0;">const</span> num)
{

  <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;

  $group$_t* $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  *num = $group$-&gt;$group_num$;

  <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_text_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> $group_num_dtype_double$ num)
{

  <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> (file-&gt;mode == <span style="color: #8b2252;">'r'</span>) <span style="color: #a020f0;">return</span> TREXIO_READONLY;

  $group$_t* $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  $group$-&gt;$group_num$ = num;
  $group$-&gt;$group_num$_isSet = <span style="color: #008b8b;">true</span>;
  $group$-&gt;to_flush = 1;

  <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_text_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;

  $group$_t* $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #a020f0;">if</span> ($group$-&gt;$group_num$_isSet == <span style="color: #008b8b;">true</span>){
    <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
  } <span style="color: #a020f0;">else</span> {
    <span style="color: #a020f0;">return</span> TREXIO_HAS_NOT;
  }

}
</pre>
</div>
</div>
</div>

<div id="outline-container-orgde379cb" class="outline-2">
<h2 id="orgde379cb"><span class="section-number-2">11.</span> Template for has/read/write a dataset of numerical data</h2>
<div class="outline-text-2" id="text-11">
<p>
The <code>group_dset</code> array is assumed allocated with the appropriate size.
</p>

<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_read_$group_dset$</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;

  $group$_t* <span style="color: #a020f0;">const</span> $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #a020f0;">if</span> (rank != $group$-&gt;rank_$group_dset$) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_3;

  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">dim_size</span> = 1;
  <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> (dims[i] != $group$-&gt;dims_$group_dset$[i]) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_4;
    dim_size *= dims[i];
  }

  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0 ; i&lt;dim_size ; ++i) {
    $group_dset$[i] = $group$-&gt;$group_dset$[i];
  }

  <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_text_write_$group_dset$</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: #a020f0;">if</span> (file-&gt;mode == <span style="color: #8b2252;">'r'</span>) <span style="color: #a020f0;">return</span> TREXIO_READONLY;

  $group$_t* <span style="color: #a020f0;">const</span> $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #a020f0;">if</span> ($group$-&gt;$group_dset$ != <span style="color: #008b8b;">NULL</span>) {
    FREE($group$-&gt;$group_dset$);
  }

  $group$-&gt;rank_$group_dset$ = rank;

  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">dim_size</span> = 1;
  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">i</span>=0; i&lt;$group$-&gt;rank_$group_dset$; ++i){
    $group$-&gt;dims_$group_dset$[i] = dims[i];
    dim_size *= dims[i];
  }

  $group$-&gt;$group_dset$ = CALLOC(dim_size, $group_dset_dtype$);

  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0 ; i&lt;dim_size ; ++i) {
    $group$-&gt;$group_dset$[i] = $group_dset$[i];
  }

  $group$-&gt;to_flush = 1;
  <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_text_has_$group_dset$</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;

  $group$_t* <span style="color: #a020f0;">const</span> $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #a020f0;">if</span> ($group$-&gt;rank_$group_dset$ &gt; 0){
    <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
  } <span style="color: #a020f0;">else</span> {
    <span style="color: #a020f0;">return</span> TREXIO_HAS_NOT;
  }

}
</pre>
</div>
</div>
</div>
<div id="outline-container-org234bb91" class="outline-2">
<h2 id="org234bb91"><span class="section-number-2">12.</span> Template for has/read/write a dataset of strings</h2>
<div class="outline-text-2" id="text-12">
<p>
The <code>group_dset</code> array is assumed allocated with the appropriate size.
</p>

<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_read_$group_dset$</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>, <span style="color: #228b22;">char</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">dset</span>, <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;">const</span> <span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">max_str_len</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> (dset == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_2;

  $group$_t* <span style="color: #a020f0;">const</span> $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #a020f0;">if</span> (rank != $group$-&gt;rank_$group_dset$) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_3;

  <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> (dims[i] != $group$-&gt;dims_$group_dset$[i]) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_4;
  }

  strcpy(dset, <span style="color: #8b2252;">""</span>);
  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0 ; i&lt;dims[0] ; ++i) {
    strncat(dset, $group$-&gt;$group_dset$[i], max_str_len);
    strcat(dset, TREXIO_DELIM);
  }

  <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_text_write_$group_dset$</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> <span style="color: #228b22;">char</span>** <span style="color: #a0522d;">dset</span>, <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> (dset == <span style="color: #008b8b;">NULL</span>)  <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_2;

  <span style="color: #a020f0;">if</span> (file-&gt;mode == <span style="color: #8b2252;">'r'</span>) <span style="color: #a020f0;">return</span> TREXIO_READONLY;

  $group$_t* <span style="color: #a020f0;">const</span> $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #a020f0;">if</span> ($group$-&gt;$group_dset$ != <span style="color: #008b8b;">NULL</span>) {
    <span style="color: #a020f0;">if</span> ($group$-&gt;rank_$group_dset$ != 0) FREE($group$-&gt;$group_dset$[0]);
    FREE($group$-&gt;$group_dset$);
  }

  $group$-&gt;rank_$group_dset$ = rank;

  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">i</span>=0; i&lt;$group$-&gt;rank_$group_dset$; ++i){
    $group$-&gt;dims_$group_dset$[i] = dims[i];
  }

  $group$-&gt;$group_dset$ = CALLOC(dims[0], <span style="color: #228b22;">char</span>*);
  <span style="color: #a020f0;">if</span> ($group$-&gt;$group_dset$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_ALLOCATION_FAILED;

  <span style="color: #228b22;">char</span>* <span style="color: #a0522d;">tmp_str</span> = CALLOC(dims[0]*32 + 1, <span style="color: #228b22;">char</span>);
  <span style="color: #a020f0;">if</span> (tmp_str == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_ALLOCATION_FAILED;

  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0 ; i&lt;dims[0] ; ++i) {
    <span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">tmp_len</span> = strlen(dset[i]);
    $group$-&gt;$group_dset$[i] = tmp_str;
    strncpy(tmp_str, dset[i], tmp_len);
    tmp_str += tmp_len + 1;
  }

  $group$-&gt;to_flush = 1;

  <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_text_has_$group_dset$</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;

  $group$_t* <span style="color: #a020f0;">const</span> $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #a020f0;">if</span> ($group$-&gt;rank_$group_dset$ &gt; 0){
    <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
  } <span style="color: #a020f0;">else</span> {
    <span style="color: #a020f0;">return</span> TREXIO_HAS_NOT;
  }

}
</pre>
</div>
</div>
</div>
<div id="outline-container-org3bb6e41" class="outline-2">
<h2 id="org3bb6e41"><span class="section-number-2">13.</span> Template for has/read/write a string attribute</h2>
<div class="outline-text-2" id="text-13">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_read_$group_str$</span> (<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>, <span style="color: #228b22;">char</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">str</span>, <span style="color: #a020f0;">const</span> <span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">max_str_len</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> (str == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_2;

  $group$_t* <span style="color: #a020f0;">const</span> $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  strncpy(str, $group$-&gt;$group_str$, max_str_len);

  <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_text_write_$group_str$</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;">char</span> *<span style="color: #a0522d;">str</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> (str  == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_2;

  <span style="color: #a020f0;">if</span> (file-&gt;mode == <span style="color: #8b2252;">'r'</span>) <span style="color: #a020f0;">return</span> TREXIO_READONLY;

  $group$_t* <span style="color: #a020f0;">const</span> $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #a020f0;">if</span> ($group$-&gt;$group_str$ != <span style="color: #008b8b;">NULL</span>) FREE($group$-&gt;$group_str$);

  <span style="color: #228b22;">size_t</span> <span style="color: #a0522d;">tmp_len</span> = strlen(str);

  $group$-&gt;$group_str$ = CALLOC(tmp_len + 1, <span style="color: #228b22;">char</span>);
  <span style="color: #a020f0;">if</span> ($group$-&gt;$group_str$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_ALLOCATION_FAILED;

  $group$-&gt;len_$group_str$ = tmp_len + 1;

  strncpy($group$-&gt;$group_str$, str, tmp_len + 1);

  $group$-&gt;to_flush = 1;

  <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_text_has_$group_str$</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;

  $group$_t* <span style="color: #a020f0;">const</span> $group$ = trexio_text_read_$group$((<span style="color: #228b22;">trexio_text_t</span>*) file);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #a020f0;">if</span> ($group$-&gt;len_$group_str$ &gt; 0){
    <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
  } <span style="color: #a020f0;">else</span> {
    <span style="color: #a020f0;">return</span> TREXIO_HAS_NOT;
  }

}
</pre>
</div>
</div>
</div>
<div id="outline-container-orgad857be" class="outline-2">
<h2 id="orgad857be"><span class="section-number-2">14.</span> Template for has/read/write the dataset of sparse data</h2>
<div class="outline-text-2" id="text-14">
<p>
Each sparse array is stored in a separate <code>.txt</code> file due to the fact that sparse I/O has to be decoupled
from conventional write/read/flush behaviour of the TEXT back end. Chunks are used to read/write sparse data
to prevent memory overflow. Chunks have a given <code>int64_t size</code>
(size specifies the number of sparse data items, e.g. integrals).
</p>

<p>
User provides indices and values of the sparse array as two separate variables.
</p>


<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span> <span style="color: #0000ff;">trexio_text_write_$group_dset$</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> <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">offset_file</span>,
                                                <span style="color: #a020f0;">const</span> <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">size</span>,
                                                <span style="color: #a020f0;">const</span> <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">size_max</span>,
                                                <span style="color: #a020f0;">const</span> <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">size_start</span>,
                                                <span style="color: #a020f0;">const</span> <span style="color: #228b22;">int32_t</span>* <span style="color: #a0522d;">index_sparse</span>,
                                                <span style="color: #a020f0;">const</span> <span style="color: #228b22;">double</span>* <span style="color: #a0522d;">value_sparse</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: #b22222;">Build the name of the file with sparse data</span>*/
  /* <span style="color: #b22222;">The $group_dset$.txt is limited to 256 symbols for the moment. What are the chances that it will exceed? </span>*/
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span> $group_dset$_file_name[256] = <span style="color: #8b2252;">"/$group_dset$.txt"</span>;
  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];

  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, $group_dset$_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen($group_dset$_file_name));

  /* <span style="color: #b22222;">Open the file in "a" (append) mode to guarantee that no truncation happens upon consecutive writes </span>*/
  <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">f</span> = fopen(file_full_path, <span style="color: #8b2252;">"a"</span>);
  <span style="color: #a020f0;">if</span> (f == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Specify the line length in order to offset properly. For example, for 4-index quantities</span>
<span style="color: #b22222;">     the line_length is 69 because 10 per index + 4 spaces + 24 for floating point value + 1 for the new line char.</span>
<span style="color: #b22222;">     CURRENTLY NO OFFSET IS USED WHEN WRITING !</span>
<span style="color: #b22222;">    </span>*/
  <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">line_length</span> = 0L;
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">format_str</span>[256];

  /* <span style="color: #b22222;">Determine the optimal type for storing indices depending on the size_max (usually mo_num or ao_num) </span>*/
  <span style="color: #a020f0;">if</span> (size_max &lt; UINT8_MAX) {
    line_length = $sparse_line_length_8$; // <span style="color: #b22222;">41 for 4 indices</span>
    strncpy(format_str, $sparse_format_printf_8$, 256);
  } <span style="color: #a020f0;">else</span> <span style="color: #a020f0;">if</span> (size_max &lt; UINT16_MAX) {
    line_length = $sparse_line_length_16$; // <span style="color: #b22222;">49 for 4 indices</span>
    strncpy(format_str, $sparse_format_printf_16$, 256);
  } <span style="color: #a020f0;">else</span> {
    line_length = $sparse_line_length_32$; //<span style="color: #b22222;">69 for 4 indices</span>
    strncpy(format_str, $sparse_format_printf_32$, 256);
  }
  strncat(format_str, <span style="color: #8b2252;">"\n"</span>, 2);

  /* <span style="color: #b22222;">Get the starting position of the IO stream to be written in the .size file.</span>
<span style="color: #b22222;">     This is error-prone due to the fact that for large files (&gt;2 GB) in 32-bit systems ftell will fail.</span>
<span style="color: #b22222;">     One can use ftello function which is adapted for large files.</span>
<span style="color: #b22222;">     For now, we can use front-end-provided size_start, which has been checked for INT64_MAX overflow.</span>
<span style="color: #b22222;">   </span>*/
  <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">io_start_pos</span> = size_start * line_length;

  /* <span style="color: #b22222;">Write the data in the file and check the return code of fprintf to verify that &gt; 0 bytes have been written </span>*/
  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span>;
  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0UL; i &lt; (<span style="color: #228b22;">uint64_t</span>) size; ++i) {
    rc = fprintf(f, format_str,
       $group_dset_sparse_indices_printf$,
       *(value_sparse + i));
    <span style="color: #a020f0;">if</span> (rc &lt;= 0) {
      fclose(f);
      <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
    }
  }

  /* <span style="color: #b22222;">Close the TXT file </span>*/
  rc = fclose(f);
  <span style="color: #a020f0;">if</span> (rc != 0) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Append .size to the file_full_path in order to write additional info about the written buffer of data </span>*/
  strncat(file_full_path, <span style="color: #8b2252;">".size"</span>, 6);

  /* <span style="color: #b22222;">Open the new file in "a" (append) mode to append info about the buffer that has been just written </span>*/
  <span style="color: #228b22;">FILE</span> *<span style="color: #a0522d;">f_wSize</span> = fopen(file_full_path, <span style="color: #8b2252;">"a"</span>);
  <span style="color: #a020f0;">if</span> (f_wSize == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Write the buffer_size </span>*/
  rc = fprintf(f_wSize, <span style="color: #8b2252;">"%"</span> PRId64 <span style="color: #8b2252;">" %"</span> PRId64 <span style="color: #8b2252;">"\n"</span>, size, io_start_pos);
  <span style="color: #a020f0;">if</span> (rc &lt;= 0) {
    fclose(f_wSize);
    <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
  }

  /* <span style="color: #b22222;">Close the TXT file </span>*/
  rc = fclose(f_wSize);
  <span style="color: #a020f0;">if</span> (rc != 0) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span> $group$_file_name[256] = <span style="color: #8b2252;">"/$group$.txt"</span>;

  memset (file_full_path, 0, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, $group$_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen($group$_file_name));

  <span style="color: #228b22;">bool</span> <span style="color: #a0522d;">file_exists</span> = trexio_text_file_exists(file_full_path);

  /* <span style="color: #b22222;">Create an empty file for the trexio_text_has_group to work </span>*/
  <span style="color: #a020f0;">if</span> (!file_exists) {
    <span style="color: #228b22;">FILE</span> *<span style="color: #a0522d;">fp</span> = fopen(file_full_path, <span style="color: #8b2252;">"ab+"</span>);
    fclose(fp);
  }

  /* <span style="color: #b22222;">Exit upon success </span>*/
  <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_text_read_$group_dset$</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> <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">offset_file</span>,
                                               <span style="color: #a020f0;">const</span> <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">size</span>,
                                               <span style="color: #a020f0;">const</span> <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">size_max</span>,
                                               <span style="color: #228b22;">int64_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">eof_read_size</span>,
                                               <span style="color: #228b22;">int32_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">index_sparse</span>,
                                               <span style="color: #228b22;">double</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">value_sparse</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> (eof_read_size == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_5;

  /* <span style="color: #b22222;">Build the name of the file with sparse data.</span>
<span style="color: #b22222;">     The $group_dset$.txt is limited to 256 symbols for the moment. What are the chances that it will exceed?</span>
<span style="color: #b22222;">   </span>*/
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span> $group_dset$_file_name[256] = <span style="color: #8b2252;">"/$group_dset$.txt"</span>;
  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];

  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, $group_dset$_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen($group_dset$_file_name));

  /* <span style="color: #b22222;">Open the file in "r" (read) mode to guarantee that no truncation happens upon consecutive reads </span>*/
  <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">f</span> = fopen(file_full_path, <span style="color: #8b2252;">"r"</span>);
  <span style="color: #a020f0;">if</span> (f == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Specify the line length in order to offset properly. For example, for 4-index quantities</span>
<span style="color: #b22222;">     the line_length is 69 because 10 per index + 4 spaces + 24 for floating point value + 1 for the new line char</span>
<span style="color: #b22222;">   </span>*/
  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">line_length</span> = 0UL;
  /* <span style="color: #b22222;">Determine the line length depending on the size_max (usually mo_num or ao_num) </span>*/
  <span style="color: #a020f0;">if</span> (size_max &lt; UINT8_MAX) {
    line_length = $sparse_line_length_8$; // <span style="color: #b22222;">41 for 4 indices</span>
  } <span style="color: #a020f0;">else</span> <span style="color: #a020f0;">if</span> (size_max &lt; UINT16_MAX) {
    line_length = $sparse_line_length_16$; // <span style="color: #b22222;">49 for 4 indices</span>
  } <span style="color: #a020f0;">else</span> {
    line_length = $sparse_line_length_32$; //<span style="color: #b22222;">69 for 4 indices</span>
  }

  /* <span style="color: #b22222;">Offset in the file according to the provided  value of offset_file and optimal line_length </span>*/
  fseek(f, (<span style="color: #228b22;">long</span>) <span style="color: #228b22;">offset_file</span> * <span style="color: #a0522d;">line_length</span>, <span style="color: #a0522d;">SEEK_SET</span>);

  /* <span style="color: #b22222;">Read the data from the file and check the return code of fprintf to verify that &gt; 0 bytes have been read or reached EOF </span>*/
  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span>;
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">buffer</span>[1024];
  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">count</span> = 0UL;
  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0UL; i &lt; (<span style="color: #228b22;">uint64_t</span>) size; ++i) {

      memset(buffer, 0, <span style="color: #a020f0;">sizeof</span>(buffer));

      <span style="color: #a020f0;">if</span> (fgets(buffer, 1023, f) == <span style="color: #008b8b;">NULL</span>){

        fclose(f);
        *eof_read_size = count;
        <span style="color: #a020f0;">return</span> TREXIO_END;

      } <span style="color: #a020f0;">else</span> {

        rc = sscanf(buffer, <span style="color: #8b2252;">"$group_dset_format_scanf$"</span>,
                    $group_dset_sparse_indices_scanf$,
                    value_sparse + i);
        <span style="color: #a020f0;">if</span> (rc &lt;= 0) {
          fclose(f);
          <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
        }
        count += 1UL;

      }
  }

  /* <span style="color: #b22222;">Close the TXT file </span>*/
  rc = fclose(f);
  <span style="color: #a020f0;">if</span> (rc != 0) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  <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_text_read_$group_dset$_size</span>(<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>, <span style="color: #228b22;">int64_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">size_max</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: #b22222;">Build the name of the file with sparse data.</span>
<span style="color: #b22222;">     The $group_dset$.txt is limited to 256 symbols for the moment. What are the chances that it will exceed?</span>
<span style="color: #b22222;">   </span>*/
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span> $group_dset$_file_name[256] = <span style="color: #8b2252;">"/$group_dset$.txt.size"</span>;
  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];

  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, $group_dset$_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen($group_dset$_file_name));

  /* <span style="color: #b22222;">Open the file in "r" (read) mode to guarantee that no truncation happens upon consecutive reads </span>*/
  <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">f</span> = fopen(file_full_path, <span style="color: #8b2252;">"r"</span>);
  <span style="color: #a020f0;">if</span> (f == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;


  /* <span style="color: #b22222;">Read the data from the file and check the return code of fprintf to verify that &gt; 0 bytes have been read or reached EOF </span>*/
  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span>;
  <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">size_item</span>, <span style="color: #a0522d;">offset_item</span>, <span style="color: #a0522d;">size_accum</span>=0L;

  /* <span style="color: #b22222;">Read the values from the file. BEWARE OF POSSIBLE MAX_INT64 OVERFLOW ! </span>*/
  <span style="color: #a020f0;">while</span>(fscanf(f, <span style="color: #8b2252;">"%"</span> SCNd64 <span style="color: #8b2252;">" %"</span> SCNd64 <span style="color: #8b2252;">""</span>, &amp;size_item, &amp;offset_item) != EOF) {
    /* <span style="color: #b22222;">Check that summation will not overflow the int64_t value </span>*/
    <span style="color: #a020f0;">if</span> (INT64_MAX - size_accum &gt; size_item) {
      size_accum += size_item;
    } <span style="color: #a020f0;">else</span> {
      fclose(f);
      *size_max = -1L;
      <span style="color: #a020f0;">return</span> TREXIO_INT_SIZE_OVERFLOW;
    }
  }

  /* <span style="color: #b22222;">Close the TXT file </span>*/
  rc = fclose(f);
  <span style="color: #a020f0;">if</span> (rc != 0) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Overwrite the value at the input address and return TREXIO_SUCCESS </span>*/
  *size_max = size_accum;
  <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_text_has_$group_dset$</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: #b22222;">Build the name of the file with sparse data.</span>
<span style="color: #b22222;">     The $group_dset$.txt is limited to 256 symbols for the moment. What are the chances that it will exceed?</span>
<span style="color: #b22222;">   </span>*/
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span> $group_dset$_file_name[256] = <span style="color: #8b2252;">"/$group_dset$.txt"</span>;
  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];

  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, $group_dset$_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen($group_dset$_file_name));

  /* <span style="color: #b22222;">Check the return code of access function to determine whether the file with sparse data exists or not </span>*/
  <span style="color: #a020f0;">if</span> (access(file_full_path, F_OK) == 0){
    <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
  } <span style="color: #a020f0;">else</span> {
    <span style="color: #a020f0;">return</span> TREXIO_HAS_NOT;
  }
}
</pre>
</div>
</div>
</div>

<div id="outline-container-org653d0b0" class="outline-2">
<h2 id="org653d0b0"><span class="section-number-2">15.</span> Template for text delete a group (UNSAFE mode)</h2>
<div class="outline-text-2" id="text-15">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_delete_$group$</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_text_t</span>* <span style="color: #a0522d;">f</span> = (<span style="color: #228b22;">trexio_text_t</span>*) file;

  $group$_t* $group$ = trexio_text_read_$group$(f);
  <span style="color: #a020f0;">if</span> ($group$ == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span> = remove($group$-&gt;file_name);
  <span style="color: #a020f0;">if</span> (rc == -1) <span style="color: #a020f0;">return</span> TREXIO_FAILURE;

  $group$-&gt;to_flush = 0;

  <span style="color: #228b22;">trexio_exit_code</span> <span style="color: #a0522d;">rc_free</span> = trexio_text_free_$group$(f);
  <span style="color: #a020f0;">if</span> (rc_free != TREXIO_SUCCESS) <span style="color: #a020f0;">return</span> rc_free;

  <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}
</pre>
</div>
</div>
</div>

<div id="outline-container-org85b8a1d" class="outline-2">
<h2 id="org85b8a1d"><span class="section-number-2">16.</span> Source code for the determinant part</h2>
<div class="outline-text-2" id="text-16">
<p>
Each array is stored in a separate <code>.txt</code> file due to the fact that determinant I/O has to be decoupled
from conventional write/read/flush behaviour of the TEXT back end. Chunks are used to read/write the data
to prevent memory overflow. Chunks have a given <code>int64_t size</code>.
Size specifies the number of data items, e.g. determinants.
</p>


<div class="org-src-container">
<pre class="src src-c"><span style="color: #228b22;">trexio_exit_code</span> <span style="color: #0000ff;">trexio_text_read_determinant_list</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;">int64_t</span> <span style="color: #a0522d;">offset_file</span>,
                                                   <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: #228b22;">int64_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">eof_read_size</span>,
                                                   <span style="color: #228b22;">int64_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">list</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> (eof_read_size == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_5;
  <span style="color: #a020f0;">if</span> (list == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_6;

  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span> <span style="color: #a0522d;">determinant_list_file_name</span>[256] = <span style="color: #8b2252;">"/determinant_list.txt"</span>;
  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];

  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, determinant_list_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen(determinant_list_file_name));

  /* <span style="color: #b22222;">Open the file in "r" (read) mode to guarantee that no truncation happens upon consecutive reads </span>*/
  <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">f</span> = fopen(file_full_path, <span style="color: #8b2252;">"r"</span>);
  <span style="color: #a020f0;">if</span> (f == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Specify the line length in order to offset properly.</span>
<span style="color: #b22222;">     Each 64-bit integer takes at most 10 slots and requires one space,</span>
<span style="color: #b22222;">     we have int_num integers per up-spin determinant,</span>
<span style="color: #b22222;">     then this number is doubled because we have the same number for down-spin electrons,</span>
<span style="color: #b22222;">     and then one newline char.</span>
<span style="color: #b22222;">   </span>*/
  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">line_length</span> = dims[1]*11UL + 1UL; // <span style="color: #b22222;">10 digits per int64_t bitfield + 1 space = 11 spots + 1 newline char</span>

  /* <span style="color: #b22222;">Offset in the file according to the provided  value of offset_file and optimal line_length </span>*/
  fseek(f, (<span style="color: #228b22;">long</span>) <span style="color: #228b22;">offset_file</span> * <span style="color: #a0522d;">line_length</span>, <span style="color: #a0522d;">SEEK_SET</span>);

  /* <span style="color: #b22222;">Read the data from the file and check the return code of fprintf to verify that &gt; 0 bytes have been read or reached EOF </span>*/
  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span>;
  /* <span style="color: #b22222;">Declare fixed buffer which will be used to read the determinant string &lt;a1 a2 ... a/\ b1 b2 ... b\/&gt; </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">buffer</span>[1024];
  <span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">buf_size</span> = <span style="color: #a020f0;">sizeof</span>(buffer);
  /* <span style="color: #b22222;">Parameters to post-process the buffer and to get bit fields integers </span>*/
  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">accum</span> = 0UL;
  <span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">shift_int64</span> = 11U;
  /* <span style="color: #b22222;">Counter for number of elements beind processed </span>*/
  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">count</span> = 0UL;
  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0UL; i &lt; dims[0]; ++i) {

    accum = 0UL;
    memset(buffer, 0, buf_size);

    <span style="color: #a020f0;">if</span> (fgets(buffer, buf_size-1, f) == <span style="color: #008b8b;">NULL</span>){

      fclose(f);
      *eof_read_size = count;
      <span style="color: #a020f0;">return</span> TREXIO_END;

    } <span style="color: #a020f0;">else</span> {

   /* <span style="color: #b22222;">The format string is not anymore static but rather dynamic (the number of ints depend on the mo_num)</span>
<span style="color: #b22222;">      Thus, we parse the buffer string int_num*2 times to get the bit field determinants.</span>
<span style="color: #b22222;">    </span>*/
      <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">j</span>=0; j &lt; (<span style="color: #228b22;">uint32_t</span>) dims[1]; ++j) {
        rc = sscanf(buffer+accum, <span style="color: #8b2252;">"%10"</span> SCNd64, list + dims[1]*i + j);
        <span style="color: #a020f0;">if</span> (rc &lt;= 0) {
          fclose(f);
          <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
        }
        accum += shift_int64;
      }
      count += 1UL;

    }
  }

  /* <span style="color: #b22222;">Close the TXT file </span>*/
  rc = fclose(f);
  <span style="color: #a020f0;">if</span> (rc != 0) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}

<span style="color: #228b22;">trexio_exit_code</span> <span style="color: #0000ff;">trexio_text_read_determinant_coefficient</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;">int64_t</span> <span style="color: #a0522d;">offset_file</span>,
                                                          <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: #228b22;">int64_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">eof_read_size</span>,
                                                          <span style="color: #228b22;">double</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">coeff</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> (eof_read_size == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_5;
  <span style="color: #a020f0;">if</span> (coeff == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_6;

  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">coeff_file_name</span>[256];
  memset(coeff_file_name, 0, <span style="color: #a020f0;">sizeof</span>(coeff_file_name));
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">int32_t</span> <span style="color: #a0522d;">trexio_state</span> = file-&gt;state;

  <span style="color: #a020f0;">if</span> (trexio_state != 0) {
    sprintf(coeff_file_name, <span style="color: #8b2252;">"/determinant_coefficient_state_%"</span> PRId32 <span style="color: #8b2252;">".txt"</span>, trexio_state);
  } <span style="color: #a020f0;">else</span> {
    strncpy(coeff_file_name, <span style="color: #8b2252;">"/determinant_coefficient.txt"</span>, 32);
  }

  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];
  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, coeff_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen(coeff_file_name));

  /* <span style="color: #b22222;">Open the file in "r" (read) mode to guarantee that no truncation happens upon consecutive reads </span>*/
  <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">f</span> = fopen(file_full_path, <span style="color: #8b2252;">"r"</span>);
  <span style="color: #a020f0;">if</span> (f == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Specify the line length in order to offset properly.</span>
<span style="color: #b22222;">     Each double value 24 elements + one newline char.</span>
<span style="color: #b22222;">   </span>*/
  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">line_length</span> = 25UL;

  /* <span style="color: #b22222;">Offset in the file according to the provided  value of offset_file and optimal line_length </span>*/
  fseek(f, (<span style="color: #228b22;">long</span>) <span style="color: #228b22;">offset_file</span> * <span style="color: #a0522d;">line_length</span>, <span style="color: #a0522d;">SEEK_SET</span>);

  /* <span style="color: #b22222;">Read the data from the file and check the return code of fprintf to verify that &gt; 0 bytes have been read or reached EOF </span>*/
  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span>;
  /* <span style="color: #b22222;">Declare fixed buffer which will be used to read the determinant string &lt;a1 a2 ... a/\ b1 b2 ... b\/&gt; </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">buffer</span>[64];
  <span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">buf_size</span> = <span style="color: #a020f0;">sizeof</span>(buffer);
  /* <span style="color: #b22222;">Counter for number of elements beind processed </span>*/
  <span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">count</span> = 0UL;

  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0UL; i &lt; dims[0]; ++i) {

    memset(buffer, 0, buf_size);
    <span style="color: #a020f0;">if</span> (fgets(buffer, buf_size-1, f) == <span style="color: #008b8b;">NULL</span>){

      fclose(f);
      *eof_read_size = count;
      <span style="color: #a020f0;">return</span> TREXIO_END;

    } <span style="color: #a020f0;">else</span> {

      rc = sscanf(buffer, <span style="color: #8b2252;">"%lf"</span>, coeff + i);
      <span style="color: #a020f0;">if</span> (rc &lt;= 0) {
        fclose(f);
        <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
      }
      count += 1UL;

    }
  }

  /* <span style="color: #b22222;">Close the TXT file </span>*/
  rc = fclose(f);
  <span style="color: #a020f0;">if</span> (rc != 0) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}

<span style="color: #228b22;">trexio_exit_code</span>
<span style="color: #0000ff;">trexio_text_read_determinant_coefficient_size</span>(<span style="color: #228b22;">trexio_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">file</span>, <span style="color: #228b22;">int64_t</span>* <span style="color: #a020f0;">const</span> <span style="color: #a0522d;">size_max</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> (size_max == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_2;

  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">coeff_file_name</span>[256];
  memset(coeff_file_name, 0, <span style="color: #a020f0;">sizeof</span>(coeff_file_name));
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">int32_t</span> <span style="color: #a0522d;">trexio_state</span> = file-&gt;state;

  <span style="color: #a020f0;">if</span> (trexio_state != 0) {
    sprintf(coeff_file_name, <span style="color: #8b2252;">"/determinant_coefficient_state_%"</span> PRId32 <span style="color: #8b2252;">".txt.size"</span>, trexio_state);
  } <span style="color: #a020f0;">else</span> {
    strncpy(coeff_file_name, <span style="color: #8b2252;">"/determinant_coefficient.txt.size"</span>, 64);
  }

  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];
  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, coeff_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen(coeff_file_name));

  /* <span style="color: #b22222;">Open the file in "r" (read) mode to guarantee that no truncation happens upon consecutive reads </span>*/
  <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">f</span> = fopen(file_full_path, <span style="color: #8b2252;">"r"</span>);
  <span style="color: #a020f0;">if</span> (f == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Read the data from the file and check the return code of fprintf to verify that &gt; 0 bytes have been read or reached EOF </span>*/
  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span>;
  <span style="color: #228b22;">int64_t</span> <span style="color: #a0522d;">size_item</span>, <span style="color: #a0522d;">size_accum</span>=0L;

  /* <span style="color: #b22222;">Read the values from the file. BEWARE OF POSSIBLE MAX_INT64 OVERFLOW ! </span>*/
  <span style="color: #a020f0;">while</span>(fscanf(f, <span style="color: #8b2252;">"%"</span> SCNd64, &amp;size_item) != EOF) {
    /* <span style="color: #b22222;">Check that summation will not overflow the int64_t value </span>*/
    <span style="color: #a020f0;">if</span> (INT64_MAX - size_accum &gt; size_item) {
      size_accum += size_item;
    } <span style="color: #a020f0;">else</span> {
      fclose(f);
      *size_max = -1L;
      <span style="color: #a020f0;">return</span> TREXIO_INT_SIZE_OVERFLOW;
    }
  }

  /* <span style="color: #b22222;">Close the TXT file </span>*/
  rc = fclose(f);
  <span style="color: #a020f0;">if</span> (rc != 0) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Overwrite the value at the input address and return TREXIO_SUCCESS </span>*/
  *size_max = size_accum;
  <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_text_write_determinant_list</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;">int64_t</span> <span style="color: #a0522d;">offset_file</span>,
                                                    <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;">const</span> <span style="color: #228b22;">int64_t</span>* <span style="color: #a0522d;">list</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> (list == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_5;

  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span> <span style="color: #a0522d;">determinant_list_file_name</span>[256] = <span style="color: #8b2252;">"/determinant_list.txt"</span>;
  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];

  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, determinant_list_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen(determinant_list_file_name));

  /* <span style="color: #b22222;">Open the file in "a" (append) mode to guarantee that no truncation happens upon consecutive writes </span>*/
  <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">f</span> = fopen(file_full_path, <span style="color: #8b2252;">"a"</span>);
  <span style="color: #a020f0;">if</span> (f == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Write the data in the file and check the return code of fprintf to verify that &gt; 0 bytes have been written </span>*/
  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span>;
  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0UL; i &lt; dims[0]; ++i) {

    /* <span style="color: #b22222;">The loop below is needed to write a line with int bit fields for alpha and beta electrons </span>*/
    <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint32_t</span> <span style="color: #a0522d;">j</span>=0; j &lt; (<span style="color: #228b22;">uint32_t</span>) dims[1]; ++j) {
      rc = fprintf(f, <span style="color: #8b2252;">"%10"</span> PRId64 <span style="color: #8b2252;">" "</span>, *(list + i*dims[1] + j));
      <span style="color: #a020f0;">if</span> (rc &lt;= 0) {
        fclose(f);
        <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
      }
    }
    fprintf(f, <span style="color: #8b2252;">"%s"</span>, <span style="color: #8b2252;">"\n"</span>);

  }

  /* <span style="color: #b22222;">Close the TXT file </span>*/
  rc = fclose(f);
  <span style="color: #a020f0;">if</span> (rc != 0) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Additional part for the trexio_text_has_group to work </span>*/
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span> <span style="color: #a0522d;">det_file_name</span>[256] = <span style="color: #8b2252;">"/determinant.txt"</span>;

  memset (file_full_path, 0, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, det_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen(det_file_name));

  <span style="color: #228b22;">bool</span> <span style="color: #a0522d;">file_exists</span> = trexio_text_file_exists(file_full_path);

  /* <span style="color: #b22222;">Create an empty file for the trexio_text_has_group to work </span>*/
  <span style="color: #a020f0;">if</span> (!file_exists) {
    <span style="color: #228b22;">FILE</span> *<span style="color: #a0522d;">fp</span> = fopen(file_full_path, <span style="color: #8b2252;">"ab+"</span>);
    fclose(fp);
  }

  /* <span style="color: #b22222;">Exit upon success </span>*/
  <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
}

<span style="color: #228b22;">trexio_exit_code</span> <span style="color: #0000ff;">trexio_text_write_determinant_coefficient</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;">int64_t</span> <span style="color: #a0522d;">offset_file</span>,
                                                           <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;">const</span> <span style="color: #228b22;">double</span>* <span style="color: #a0522d;">coeff</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> (coeff == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_INVALID_ARG_5;

  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">coeff_file_name</span>[256];
  memset(coeff_file_name, 0, <span style="color: #a020f0;">sizeof</span>(coeff_file_name));
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">int32_t</span> <span style="color: #a0522d;">trexio_state</span> = file-&gt;state;

  <span style="color: #a020f0;">if</span> (trexio_state != 0) {
    sprintf(coeff_file_name, <span style="color: #8b2252;">"/determinant_coefficient_state_%"</span> PRId32 <span style="color: #8b2252;">".txt"</span>, trexio_state);
  } <span style="color: #a020f0;">else</span> {
    strncpy(coeff_file_name, <span style="color: #8b2252;">"/determinant_coefficient.txt"</span>, 32);
  }

  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];
  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, coeff_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen(coeff_file_name));

  /* <span style="color: #b22222;">Open the file in "a" (append) mode to guarantee that no truncation happens upon consecutive writes </span>*/
  <span style="color: #228b22;">FILE</span>* <span style="color: #a0522d;">f</span> = fopen(file_full_path, <span style="color: #8b2252;">"a"</span>);
  <span style="color: #a020f0;">if</span> (f == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Write the data in the file and check the return code of fprintf to verify that &gt; 0 bytes have been written </span>*/
  <span style="color: #228b22;">int</span> <span style="color: #a0522d;">rc</span>;
  <span style="color: #a020f0;">for</span> (<span style="color: #228b22;">uint64_t</span> <span style="color: #a0522d;">i</span>=0UL; i &lt; dims[0]; ++i) {

    rc = fprintf(f, <span style="color: #8b2252;">"%24.16e\n"</span>, *(coeff + i));
    <span style="color: #a020f0;">if</span> (rc &lt;= 0) {
      fclose(f);
      <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
    }

  }

  /* <span style="color: #b22222;">Close the TXT file </span>*/
  rc = fclose(f);
  <span style="color: #a020f0;">if</span> (rc != 0) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Append .size to the file_full_path in order to write additional info about the written buffer of data </span>*/
  strncat(file_full_path, <span style="color: #8b2252;">".size"</span>, 6);

  /* <span style="color: #b22222;">Open the new file in "a" (append) mode to append info about the buffer that has been just written </span>*/
  <span style="color: #228b22;">FILE</span> *<span style="color: #a0522d;">f_wSize</span> = fopen(file_full_path, <span style="color: #8b2252;">"a"</span>);
  <span style="color: #a020f0;">if</span> (f_wSize == <span style="color: #008b8b;">NULL</span>) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Write the buffer_size </span>*/
  rc = fprintf(f_wSize, <span style="color: #8b2252;">"%"</span> PRIu64 <span style="color: #8b2252;">"\n"</span>, dims[0]);
  <span style="color: #a020f0;">if</span> (rc &lt;= 0) {
    fclose(f_wSize);
    <span style="color: #a020f0;">return</span> TREXIO_FAILURE;
  }

  /* <span style="color: #b22222;">Close the TXT file </span>*/
  rc = fclose(f_wSize);
  <span style="color: #a020f0;">if</span> (rc != 0) <span style="color: #a020f0;">return</span> TREXIO_FILE_ERROR;

  /* <span style="color: #b22222;">Additional part for the trexio_text_has_group to work </span>*/
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">char</span> <span style="color: #a0522d;">det_file_name</span>[256] = <span style="color: #8b2252;">"/determinant.txt"</span>;

  memset (file_full_path, 0, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, det_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen(det_file_name));

  <span style="color: #228b22;">bool</span> <span style="color: #a0522d;">file_exists</span> = trexio_text_file_exists(file_full_path);

  /* <span style="color: #b22222;">Create an empty file for the trexio_text_has_group to work </span>*/
  <span style="color: #a020f0;">if</span> (!file_exists) {
    <span style="color: #228b22;">FILE</span> *<span style="color: #a0522d;">fp</span> = fopen(file_full_path, <span style="color: #8b2252;">"ab+"</span>);
    fclose(fp);
  }

  /* <span style="color: #b22222;">Exit upon success </span>*/
  <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_text_has_determinant_list</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;">char</span> <span style="color: #a0522d;">determinant_list_file_name</span>[256] = <span style="color: #8b2252;">"/determinant_list.txt"</span>;
  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];

  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, determinant_list_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen(determinant_list_file_name));

  /* <span style="color: #b22222;">Check the return code of access function to determine whether the file with data exists or not </span>*/
  <span style="color: #a020f0;">if</span> (access(file_full_path, F_OK) == 0){
    <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
  } <span style="color: #a020f0;">else</span> {
    <span style="color: #a020f0;">return</span> TREXIO_HAS_NOT;
  }
}

<span style="color: #228b22;">trexio_exit_code</span> <span style="color: #0000ff;">trexio_text_has_determinant_coefficient</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;">char</span> <span style="color: #a0522d;">coeff_file_name</span>[256];
  memset(coeff_file_name, 0, <span style="color: #a020f0;">sizeof</span>(coeff_file_name));
  <span style="color: #a020f0;">const</span> <span style="color: #228b22;">int32_t</span> <span style="color: #a0522d;">trexio_state</span> = file-&gt;state;

  <span style="color: #a020f0;">if</span> (trexio_state != 0) {
    sprintf(coeff_file_name, <span style="color: #8b2252;">"/determinant_coefficient_state_%"</span> PRId32 <span style="color: #8b2252;">".txt"</span>, trexio_state);
  } <span style="color: #a020f0;">else</span> {
    strncpy(coeff_file_name, <span style="color: #8b2252;">"/determinant_coefficient.txt"</span>, 32);
  }

  /* <span style="color: #b22222;">The full path to the destination TXT file with sparse data. This will include TREXIO directory name. </span>*/
  <span style="color: #228b22;">char</span> <span style="color: #a0522d;">file_full_path</span>[TREXIO_MAX_FILENAME_LENGTH];
  /* <span style="color: #b22222;">Copy directory name in file_full_path </span>*/
  strncpy (file_full_path, file-&gt;file_name, TREXIO_MAX_FILENAME_LENGTH);
  /* <span style="color: #b22222;">Append name of the file with sparse data </span>*/
  strncat (file_full_path, coeff_file_name,
           TREXIO_MAX_FILENAME_LENGTH-strlen(coeff_file_name));

  /* <span style="color: #b22222;">Check the return code of access function to determine whether the file with data exists or not </span>*/
  <span style="color: #a020f0;">if</span> (access(file_full_path, F_OK) == 0){
    <span style="color: #a020f0;">return</span> TREXIO_SUCCESS;
  } <span style="color: #a020f0;">else</span> {
    <span style="color: #a020f0;">return</span> TREXIO_HAS_NOT;
  }
}
</pre>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="author">Author: TREX-CoE</p>
<p class="date">Created: 2022-09-29 Thu 11:40</p>
<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
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