Index: trunk/src_plugins/lib_compat_help/route_style.c
===================================================================
--- trunk/src_plugins/lib_compat_help/route_style.c	(revision 34383)
+++ trunk/src_plugins/lib_compat_help/route_style.c	(revision 34384)
@@ -53,3 +53,16 @@
 
 	return 0;
 }
+
+int pcb_compat_route_style_via_load(pcb_data_t *data, pcb_route_style_t *rst, rnd_coord_t drill_dia, rnd_coord_t pad_dia, rnd_coord_t mask)
+{
+	rnd_cardinal_t pid = pcb_pstk_new_compat_via_proto(data, drill_dia, pad_dia, mask, PCB_PSTK_COMPAT_ROUND, 1, 0);
+
+	if (pid == -1)
+		return -1;
+
+	rst->via_proto = pid;
+	rst->via_proto_set = 1;
+
+	return 0;
+}
Index: trunk/src_plugins/lib_compat_help/route_style.h
===================================================================
--- trunk/src_plugins/lib_compat_help/route_style.h	(revision 34383)
+++ trunk/src_plugins/lib_compat_help/route_style.h	(revision 34384)
@@ -3,3 +3,7 @@
 /* For IO code: attempt to convert via padstack proto of a route style into old
    geda/pcb route style description. Generates IO errors on failure. */
 int pcb_compat_route_style_via_save(pcb_data_t *data, const pcb_route_style_t *rst, rnd_coord_t *drill_dia, rnd_coord_t *pad_dia, rnd_coord_t *mask);
+
+/* For IO code: look up or create a via pstk prototype for a route style that
+   specified diameters (old style via description). */
+int pcb_compat_route_style_via_load(pcb_data_t *data, pcb_route_style_t *rst, rnd_coord_t drill_dia, rnd_coord_t pad_dia, rnd_coord_t mask);