Index: Plug.tmpasm
===================================================================
--- Plug.tmpasm	(revision 35180)
+++ Plug.tmpasm	(revision 35181)
@@ -3,6 +3,7 @@
 	$(PLUGDIR)/lib_netmap/netmap.o
 	$(PLUGDIR)/lib_netmap/map_2nets.o
 	$(PLUGDIR)/lib_netmap/placement.o
+	$(PLUGDIR)/lib_netmap/pstklib.o
 @]
 
 switch /local/pcb/lib_netmap/controls
Index: pstklib.c
===================================================================
--- pstklib.c	(nonexistent)
+++ pstklib.c	(revision 35181)
@@ -0,0 +1,59 @@
+/*
+ *                            COPYRIGHT
+ *
+ *  pcb-rnd, interactive printed circuit board design
+ *  Copyright (C) 2021 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 Street, 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")
+ */
+
+#include "config.h"
+#include "pstklib.h"
+#include <genht/ht_utils.h>
+
+void pcb_pstklib_init(pcb_pstklib_t *ctx, pcb_board_t *pcb)
+{
+	memset(&ctx->protos, 0, sizeof(ctx->protos));
+	ctx->pcb = pcb;
+	ctx->next_id = 1;
+	htprp_init(&ctx->protos, pcb_pstk_proto_hash, pcb_pstk_proto_eq);
+}
+
+void pcb_pstklib_uninit(pcb_pstklib_t *ctx)
+{
+	genht_uninit_deep(htprp, &ctx->protos, {
+		pcb_pstklib_entry_t *pe = htent->value;
+		if (ctx->on_free_entry != NULL)
+			ctx->on_free_entry(ctx, pe);
+		free(pe);
+	});
+}
+
+void pcb_pstklib_build_data(pcb_pstklib_t *ctx, pcb_data_t *data)
+{
+	long n;
+	for(n = 0; n < data->ps_protos.used; n++) {
+		pcb_pstk_proto_t *proto = &data->ps_protos.array[n];
+
+		if (!proto->in_use) continue;
+
+	}
+}
+
Index: pstklib.h
===================================================================
--- pstklib.h	(nonexistent)
+++ pstklib.h	(revision 35181)
@@ -0,0 +1,31 @@
+#include "board.h"
+#include "data.h"
+#include "ht_pstk.h"
+
+/* Build a hash of subcircuit-to-prototype. Effectively a local library
+   of unique footprint prototypes */
+
+typedef struct {
+	pcb_pstk_proto_t proto;  /* copy of a proto */
+	long id;                 /* unique ID counted from 1 by pcb_pstklib_build */
+	void *user_data;
+} pcb_pstklib_entry_t;
+
+typedef struct pcb_pstklib_s pcb_pstklib_t;
+struct pcb_pstklib_s {
+	htprp_t protos;   /* value is (pcb_pstklib_entry_t *) */
+	pcb_board_t *pcb;
+	long next_id;
+
+	void (*on_free_entry)(pcb_pstklib_t *ctx, pcb_pstklib_entry_t *pe); /* optional: if set, called before freeing an entry on uninit */
+	void *user_data;
+};
+
+void pcb_pstklib_init(pcb_pstklib_t *ctx, pcb_board_t *pcb);
+void pcb_pstklib_uninit(pcb_pstklib_t *ctx);
+
+/* Iterate all padstack prototypes within data and build ctx->protos hash */
+void pcb_pstklib_build_data(pcb_pstklib_t *ctx, pcb_data_t *data);
+
+/* return proto's prototype or NULL */
+#define pcb_pstklib_get(ctx, proto)    htprp_get((ctx)->protos, (proto))