Index: obj_pstk.h
===================================================================
--- obj_pstk.h	(revision 19240)
+++ obj_pstk.h	(revision 19241)
@@ -79,8 +79,14 @@
 	int mech_idx;                  /* -1 or index to the first shape[] that is of PCB_LYT_MECH */
 } pcb_pstk_proto_t;
 
+/* Whether a proto cuts through board layers (has a hole or slot) */
+#define PCB_PSTK_PROTO_CUTS(proto) (((proto)->hdia > 0) || ((proto)->mech_idx >= 0))
 
+/* Whether a proto cuts through board layers (has a hole or slot) and connects
+   layers with conductive material */
+#define PCB_PSTK_PROTO_PLATES(proto) (((proto)->hplated) && (((proto)->hdia > 0) || ((proto)->mech_idx >= 0)))
 
+
 pcb_pstk_t *pcb_pstk_alloc(pcb_data_t *data);
 void pcb_pstk_free(pcb_pstk_t *ps);
 pcb_pstk_t *pcb_pstk_new(pcb_data_t *data, pcb_cardinal_t proto, pcb_coord_t x, pcb_coord_t y, pcb_coord_t clearance, pcb_flag_t Flags);