Index: trunk/src/drc.h
===================================================================
--- trunk/src/drc.h	(revision 21137)
+++ trunk/src/drc.h	(revision 21138)
@@ -29,8 +29,10 @@
 #ifndef PCB_DRC_H
 #define PCB_DRC_H
 
+#include <genlist/gendlist.h>
 #include "unit.h"
 
+typedef struct drc_violation_s pcb_drc_violation_t;
 struct drc_violation_s {
 	char *title;
 	char *explanation;
@@ -42,8 +44,25 @@
 	int object_count;
 	long int *object_id_list;
 	int *object_type_list;
+
+	gdl_elem_t link;              /* always part of a list */
 };
 
-typedef struct drc_violation_s pcb_drc_violation_t;
+void pcb_drc_list_free_fields(pcb_drc_violation_t *drc);
+void pcb_drc_list_free(pcb_drc_violation_t *drc);
 
+/* List of drc violations */
+#define TDL(x)      pcb_drc_list_ ## x
+#define TDL_LIST_T  pcb_drc_list_t
+#define TDL_ITEM_T  pcb_drc_violation_t
+#define TDL_FIELD   link
+#define TDL_SIZE_T  size_t
+#define TDL_FUNC
+
+#define pcb_drc_list_foreach(list, iterator, loop_elem) \
+	gdl_foreach_((&((list)->lst)), (iterator), (loop_elem))
+
+#include <genlist/gentdlist_impl.h>
+#include <genlist/gentdlist_undef.h>
+
 #endif
Index: trunk/src/drc_list.c
===================================================================
--- trunk/src/drc_list.c	(nonexistent)
+++ trunk/src/drc_list.c	(revision 21138)
@@ -0,0 +1,44 @@
+/*
+ *
+ *                            COPYRIGHT
+ *
+ *  pcb-rnd, interactive printed circuit board design
+ *  (this file is based on PCB, interactive printed circuit board design)
+ *  Copyright (C) 1994,1995,1996, 2005 Thomas Nau
+ *  Copyright (C) 2018 Tibor 'Igor2' Palinkas
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ *  Contact:
+ *    Project page: http://repo.hu/projects/pcb-rnd
+ *    lead developer: http://repo.hu/projects/pcb-rnd/contact.html
+ *    mailing list: pcb-rnd (at) list.repo.hu (send "subscribe")
+ *
+ */
+
+#define TDL_DONT_UNDEF
+#include "drc.h"
+#include <genlist/gentdlist_impl.c>
+
+void pcb_drc_list_free_fields(pcb_drc_violation_t *drc)
+{
+	free(drc);
+}
+
+void pcb_drc_list_free(pcb_drc_violation_t *drc)
+{
+	pcb_drc_list_free_fields(drc);
+	free(drc);
+}