read single numerical attributes based on _isSet bool flag

src/templates_text/templator_text.org

@@ -46,6 +46,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/stat.h>
+#include <stdbool.h>
 
   #+end_src
 
@@ -79,6 +80,7 @@
     #+begin_src c :tangle struct_text_group_dset.h
 typedef struct $group$_s {
   $group_num_dtype_double$ $group_num$;
+  bool $group_num$_isSet;
   $group_dset_dtype$*  $group_dset$;
   uint32_t rank_$group_dset$;
   uint32_t to_flush;
@@ -346,8 +348,30 @@ trexio_text_read_$group$ (trexio_text_t* const file)
     }
     // END REPEAT GROUP_DSET_ALL
 
+    unsigned int local_isSet;
     // START REPEAT GROUP_NUM
  /* Read data */
+    rc = fscanf(f, "%1023s", buffer);
+    assert(!((rc != 1) || (strcmp(buffer, "$group_num$_isSet") != 0)));
+    if ((rc != 1) || (strcmp(buffer, "$group_num$_isSet") != 0)) {
+      FREE(buffer);
+      fclose(f);
+      FREE($group$);
+      return NULL;
+    }
+    
+ /* additional parameter local_isSet is needed to suppress warning when fscanf into bool variable using %u or %d */
+    rc = fscanf(f, "%u", &(local_isSet));
+    $group$->$group_num$_isSet = (bool) local_isSet;
+    assert(!(rc != 1));
+    if (rc != 1) {
+      FREE(buffer);
+      fclose(f);
+      FREE($group$);
+      return NULL;
+    }
+
+    if ($group$->$group_num$_isSet == true) { 
       rc = fscanf(f, "%1023s", buffer);
       assert(!((rc != 1) || (strcmp(buffer, "$group_num$") != 0)));
       if ((rc != 1) || (strcmp(buffer, "$group_num$") != 0)) {
@@ -365,6 +389,7 @@ trexio_text_read_$group$ (trexio_text_t* const file)
         FREE($group$);
         return NULL;
       }
+    }
     // END REPEAT GROUP_NUM
 
     // START REPEAT GROUP_ATTR_STR
@@ -555,7 +580,8 @@ trexio_text_flush_$group$ (trexio_text_t* const file)
   // END REPEAT GROUP_DSET_ALL
 
   // START REPEAT GROUP_NUM
-  fprintf(f, "$group_num$ %$group_num_std_dtype_out$ \n", $group$->$group_num$);
+  fprintf(f, "$group_num$_isSet %u \n", $group$->$group_num$_isSet);
+  if ($group$->$group_num$_isSet == true) fprintf(f, "$group_num$ %$group_num_std_dtype_out$ \n", $group$->$group_num$);
   // END REPEAT GROUP_NUM
 
   // START REPEAT GROUP_ATTR_STR
@@ -662,6 +688,7 @@ trexio_text_write_$group_num$ (trexio_t* const file, const $group_num_dtype_doub
   if ($group$ == NULL) return TREXIO_FAILURE;
 
   $group$->$group_num$ = num;
+  $group$->$group_num$_isSet = true;
   $group$->to_flush = 1;
 
   return TREXIO_SUCCESS;
@@ -678,7 +705,7 @@ trexio_text_has_$group_num$ (trexio_t* const file)
   $group$_t* $group$ = trexio_text_read_$group$((trexio_text_t*) file);
   if ($group$ == NULL) return TREXIO_FAILURE;
 
-  if ($group$->$group_num$ > 0L){
+  if ($group$->$group_num$_isSet == true){
     return TREXIO_SUCCESS;
   } else {
     return TREXIO_HAS_NOT;

tests/io_num_hdf5.c

@@ -27,6 +27,14 @@ static int test_write_num (const char* file_name, const back_end_t backend) {
   rc = trexio_write_nucleus_num(file, num);
   assert (rc == TREXIO_SUCCESS);
 
+  // attempt to write 0 as dimensioning variable in an empty file; should FAIL and return TREXIO_INVALID_ARG_2
+  rc = trexio_write_mo_num(file, 0);
+  assert (rc == TREXIO_INVALID_ARG_2);
+
+  // write numerical attribute ao_cartesian as 0
+  rc = trexio_write_ao_cartesian(file, 0);
+  assert (rc == TREXIO_SUCCESS);
+
   // close current session
   rc = trexio_close(file);
   assert (rc == TREXIO_SUCCESS);
@@ -77,6 +85,7 @@ static int test_read_num (const char* file_name, const back_end_t backend) {
 
   // parameters to be read
   int num;
+  int cartesian;
 
 /*================= START OF TEST ==================*/
 
@@ -89,6 +98,15 @@ static int test_read_num (const char* file_name, const back_end_t backend) {
   assert (rc == TREXIO_SUCCESS);
   assert (num == 12);
 
+  // read non-existing numerical attribute from the file
+  rc = trexio_read_mo_num(file, &num);
+  assert (rc == TREXIO_ATTR_MISSING);
+
+  // read ao_cartesian (zero) value from the file
+  rc = trexio_read_ao_cartesian(file, &cartesian);
+  assert (rc == TREXIO_SUCCESS);
+  assert (cartesian == 0);
+
   // close current session
   rc = trexio_close(file);
   assert (rc == TREXIO_SUCCESS);

tests/io_num_text.c

@@ -27,6 +27,14 @@ static int test_write_num (const char* file_name, const back_end_t backend) {
   rc = trexio_write_nucleus_num(file, num);
   assert (rc == TREXIO_SUCCESS);
 
+  // attempt to write 0 as dimensioning variable in an empty file; should FAIL and return TREXIO_INVALID_ARG_2
+  rc = trexio_write_mo_num(file, 0);
+  assert (rc == TREXIO_INVALID_ARG_2);
+
+  // write numerical attribute ao_cartesian as 0
+  rc = trexio_write_ao_cartesian(file, 0);
+  assert (rc == TREXIO_SUCCESS);
+
   // close current session
   rc = trexio_close(file);
   assert (rc == TREXIO_SUCCESS);
@@ -77,6 +85,7 @@ static int test_read_num (const char* file_name, const back_end_t backend) {
 
   // parameters to be read
   int num;
+  int cartesian;
 
 /*================= START OF TEST ==================*/
 
@@ -89,6 +98,15 @@ static int test_read_num (const char* file_name, const back_end_t backend) {
   assert (rc == TREXIO_SUCCESS);
   assert (num == 12);
 
+  // read non-existing numerical attribute from the file
+  rc = trexio_read_mo_num(file, &num);
+  assert (rc == TREXIO_ATTR_MISSING);
+
+  // read ao_cartesian (zero) value from the file
+  rc = trexio_read_ao_cartesian(file, &cartesian);
+  assert (rc == TREXIO_SUCCESS);
+  assert (cartesian == 0);
+
   // close current session
   rc = trexio_close(file);
   assert (rc == TREXIO_SUCCESS);