Index: plug_import.c
===================================================================
--- plug_import.c	(nonexistent)
+++ plug_import.c	(revision 2449)
@@ -0,0 +1,121 @@
+/*
+ *                            COPYRIGHT
+ *
+ *  PCB, interactive printed circuit board design
+ *  Copyright (C) 1994,1995,1996,1997,1998,2005,2006 Thomas Nau
+ *  Copyright (C) 2015,2016 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.
+ *
+ *  Contact addresses for paper mail and Email:
+ *  Thomas Nau, Schlehenweg 15, 88471 Baustetten, Germany
+ *  Thomas.Nau@rz.uni-ulm.de
+ *
+ */
+
+/* This used to be file.c; it's a hook based plugin API now */
+
+#include "config.h"
+#include "conf_core.h"
+
+#include <locale.h>
+
+#include "global.h"
+
+#include <time.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "plugins.h"
+#include "plug_import.h"
+#include "error.h"
+
+
+plug_import_t *plug_import_chain = NULL;
+
+typedef struct {
+	plug_import_t *plug;
+	int prio;
+} find_t;
+
+/* Find the plugin that offers the highest write prio for the format */
+static plug_import_t *find_importer(unsigned int aspects, FILE *f, const char *filename)
+{
+	find_t available[32]; /* wish we had more than 32 import plugins... */
+	int n, len = 0, best = 0, bestidx = -1;
+
+#define cb_append(pl, pr) \
+	do { \
+		rewind(f); \
+		if (pr > 0) { \
+			assert(len < sizeof(available)/sizeof(available[0])); \
+			available[len].plug = pl; \
+			available[len++].prio = pr; \
+		} \
+	} while(0)
+
+	HOOK_CALL_ALL(plug_import_t, plug_import_chain, fmt_support_prio, cb_append,   aspects, f, filename);
+	if (len == 0)
+		return NULL;
+
+	for(n = 0; n < len; n++) {
+		if (available[n].prio > best) {
+			bestidx = n;
+			best = available[n].prio;
+		}
+	}
+
+	if (best == 0)
+		return NULL;
+
+	return available[bestidx].plug;
+#undef cb_append
+}
+
+
+int pcb_import(char *filename, unsigned int aspect)
+{
+	plug_import_t *plug;
+	FILE *fp;
+
+	if (!filename) {
+		Message("Error: need a file name for ImportNetlist()\n");
+		return (1); /* nothing to do */
+	}
+	fp = fopen(filename, "r");
+
+	plug = find_importer(aspect, fp, filename);
+	if (plug == NULL) {
+		if (fp != NULL) {
+			Message("Error: can't find a suitable netlist parser for %s\n", filename);
+			fclose(fp);
+		}
+		else
+			Message("Error: can't find a suitable netlist parser for %s - might be related: can't open %s for reading\n", filename, filename);
+		return 1;
+	}
+
+	if (fp != NULL)
+		fclose(fp);
+
+	return plug->import(plug, aspect, filename);
+}
+
+int ImportNetlist(char *filename)
+{
+	return pcb_import(filename, IMPORT_ASPECT_NETLIST);
+}