Index: trunk/src/data.c
===================================================================
--- trunk/src/data.c	(revision 12128)
+++ trunk/src/data.c	(revision 12129)
@@ -30,6 +30,7 @@
 
 #include "board.h"
 #include "data.h"
+#include "data_list.h"
 #include "rtree.h"
 #include "list_common.h"
 #include "obj_all.h"
@@ -490,3 +491,30 @@
 	}
 	PCB_ENDALL_LOOP;
 }
+
+void pcb_data_list_by_flag(pcb_data_t *data, vtp0_t *dst, pcb_objtype_t type, unsigned long mask)
+{
+	if (type & PCB_OBJ_VIA) PCB_VIA_LOOP(data); {
+		if (PCB_FLAG_TEST(mask, via)) vtp0_append(dst, via);
+	} PCB_END_LOOP;
+	if (type & PCB_OBJ_ELEMENT) PCB_ELEMENT_LOOP(data); {
+		if (PCB_FLAG_TEST(mask, element)) vtp0_append(dst, element);
+	} PCB_END_LOOP;
+	if (type & PCB_OBJ_SUBC) PCB_SUBC_LOOP(data); {
+		if (PCB_FLAG_TEST(mask, subc)) vtp0_append(dst, subc);
+	} PCB_END_LOOP;
+	if (type & PCB_OBJ_LINE) PCB_LINE_ALL_LOOP(data); {
+		if (PCB_FLAG_TEST(mask, line)) vtp0_append(dst, line);
+	} PCB_ENDALL_LOOP;
+	if (type & PCB_OBJ_ARC) PCB_ARC_ALL_LOOP(data); {
+		if (PCB_FLAG_TEST(mask, arc)) vtp0_append(dst, arc);
+	} PCB_ENDALL_LOOP;
+	if (type & PCB_OBJ_TEXT) PCB_TEXT_ALL_LOOP(data); {
+		if (PCB_FLAG_TEST(mask, text)) vtp0_append(dst, text);
+	} PCB_ENDALL_LOOP;
+	if (type & PCB_OBJ_POLYGON) PCB_POLY_ALL_LOOP(data); {
+		if (PCB_FLAG_TEST(mask, polygon)) vtp0_append(dst, polygon);
+	} PCB_ENDALL_LOOP;
+}
+
+
Index: trunk/src/data_list.h
===================================================================
--- trunk/src/data_list.h	(nonexistent)
+++ trunk/src/data_list.h	(revision 12129)
@@ -0,0 +1,33 @@
+/*
+ *                            COPYRIGHT
+ *
+ *  pcb-rnd, interactive printed circuit board design
+ *  Copyright (C) 2017 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#ifndef PCB_DATA_LIST_H
+#define PCB_DATA_LIST_H
+
+#include <genvector/vtp0.h>
+#include "data.h"
+
+/* append objects or type, with flags matching mask to dst; pointer are
+   valid only until the first change to data */
+void pcb_data_list_by_flag(pcb_data_t *data, vtp0_t *dst, pcb_objtype_t type, unsigned long mask);
+
+#endif