Added function for adding dname if not present.

refs #920 @20m

src/dnslib/dname-table.c

@@ -104,6 +104,36 @@ int dnslib_dname_table_add_dname(dnslib_dname_table_t *table,
 	return DNSLIB_EOK;
 }
 
+int dnslib_dname_table_add_dname2(dnslib_dname_table_t *table,
+                                  dnslib_dname_t **dname)
+{
+	dnslib_dname_t *found_dname = NULL;
+	int ret;
+
+	char *name = dnslib_dname_to_str(*dname);
+	printf("Inserting name %s to dname table.\n", name);
+	free(name);
+
+	if ((!(found_dname =
+	      dnslib_dname_table_find_dname(table ,*dname))) &&
+	      (ret = dnslib_dname_table_add_dname(table, *dname))
+	      != DNSLIB_EOK) {
+		printf("Error!\n");
+		return ret;
+	} else if (found_dname != NULL && found_dname != *dname) {
+		/*! \todo Remove the check for equality. */
+		name = dnslib_dname_to_str(found_dname);
+		printf("Already there: %s (%p)\n", name, found_dname);
+		free(name);
+		dnslib_dname_free(dname);
+		*dname = found_dname;
+	}
+
+	printf("Done.\n");
+
+	return DNSLIB_EOK;
+}
+
 void dnslib_dname_table_free(dnslib_dname_table_t **table)
 {
 	if (table == NULL || *table == NULL) {

src/dnslib/dname-table.h

@@ -80,6 +80,21 @@ dnslib_dname_t *dnslib_dname_table_find_dname(const dnslib_dname_table_t *table,
 int dnslib_dname_table_add_dname(dnslib_dname_table_t *table,
 				 dnslib_dname_t *dname);
 
+/*!
+ * \brief Adds domain name to domain name table and checks for duplicates.
+ *
+ * \param table Domain name table to be added to.
+ * \param dname Domain name to be added.
+ *
+ * \note This function encapsulates dname in a structure and saves it to a tree.
+ * \note If a duplicate is found, \a dname is replaced by the name from table.
+ *
+ * \retval DNSLIB_EOK on success.
+ * \retval DNSLIB_ENOMEM when memory runs out.
+ */
+int dnslib_dname_table_add_dname2(dnslib_dname_table_t *table,
+                                  dnslib_dname_t **dname);
+
 /*!
  * \brief Frees dname table without its nodes. Sets pointer to NULL.
  *