dp doubly linked list

linkage.h

@@ -0,0 +1,29 @@
+/*
+ * IGC parser - data linking module (doubly linked datapoint list)
+ * @brief parse IGC file, get all data points, compute average horizontal/vertical speed, print to STDOUT
+ *
+ * As per standard: https://xp-soaring.github.io/igc_file_format/igc_format_2008.html
+ *                  https://xp-soaring.github.io/igc_file_format/igc_fr_specification_with_al8_2023-2-1_0.pdf
+ *
+ * @author xamidev <xamidev@riseup.net>
+ * @license GNU GPL v3
+ */
+
+#ifndef LINKAGE_H
+#define LINKAGE_H
+
+#include "igc.h"
+
+struct dp_node
+{
+	struct IGC_DataPoint* data;
+
+	struct dp_node* prev;
+	struct dp_node* next;
+};
+
+struct dp_node* create_datapoint_list();
+void append_datapoint(struct dp_node* list, struct IGC_DataPoint* dp);
+void print_datapoint_list(struct dp_node* list);
+
+#endif