Index: trunk/src/libcschem/attrib.c
===================================================================
--- trunk/src/libcschem/attrib.c	(revision 3971)
+++ trunk/src/libcschem/attrib.c	(revision 3972)
@@ -837,6 +837,26 @@
 
 }
 
+void csch_attrib_plugin_source_c(csch_source_arg_t *dst, const char *filename, long line, long col, const char *desc)
+{
+	gds_t tmp = {0};
+
+	dst->type[0] = 'c';
+	dst->type[1] = '\0';
+
+	if (filename == NULL) filename = "-";
+	if (desc == NULL) desc = "";
+
+	if ((line > 0) && (col > 0))
+		dst->source = rnd_strdup_printf("%s,%ld,%ld", filename, line, col);
+	else if (line > 0)
+		dst->source = rnd_strdup_printf("%s,%ld", filename, line);
+	else
+		dst->source = rnd_strdup(filename);
+
+	dst->desc = rnd_strdup(desc);
+}
+
 void csch_attrib_plugin_source_ac(csch_source_arg_t *dst, csch_chdr_t *cobj, const char *attr_name, const char *desc)
 {
 	gds_t tmp = {0};
Index: trunk/src/libcschem/attrib.h
===================================================================
--- trunk/src/libcschem/attrib.h	(revision 3971)
+++ trunk/src/libcschem/attrib.h	(revision 3972)
@@ -69,6 +69,7 @@
 
 /* Create source info in dst for different source addressing schemes, as
    specified in {des4:19} */
+void csch_attrib_plugin_source_c(csch_source_arg_t *dst, const char *filename, long line, long col, const char *desc);
 void csch_attrib_plugin_source_ac(csch_source_arg_t *dst, csch_chdr_t *cobj, const char *attr_name, const char *desc);
 void csch_attrib_plugin_source_pa(csch_source_arg_t *dst, csch_ahdr_t *aobj, const char *attr_name, const char *plugin_name, const char *desc);
 void csch_attrib_plugin_source_p(csch_source_arg_t *dst, const char *plugin_name, const char *desc);
Index: trunk/src/libcschem/util_grp.c
===================================================================
--- trunk/src/libcschem/util_grp.c	(revision 3971)
+++ trunk/src/libcschem/util_grp.c	(revision 3972)
@@ -182,8 +182,10 @@
 
 void csch_auto_attr_create(csch_sheet_t *sheet, csch_cgrp_t *grp, const char *key, const char *val, const char *stroke, const char *atempl)
 {
-	static const csch_source_arg_t src = {"c", "n/a", ""};
+	static const csch_source_arg_t src;
 
+	csch_attrib_plugin_source_c(&src, NULL, 0, 0, NULL);
+
 	csch_cobj_attrib_set(sheet, grp, CSCH_ATP_USER_DEFAULT, key, val, src);
 	if (stroke != NULL)
 		csch_auto_attr_place(sheet, grp, key, stroke, atempl);
Index: trunk/src/libcschem/util_wirenet.c
===================================================================
--- trunk/src/libcschem/util_wirenet.c	(revision 3971)
+++ trunk/src/libcschem/util_wirenet.c	(revision 3972)
@@ -98,9 +98,11 @@
 
 csch_cgrp_t *csch_wirenet_new(csch_sheet_t *sheet)
 {
-	static const csch_source_arg_t src = {"c", "unsaved", "manual_draw_wirenet"};
+	static const csch_source_arg_t src;
 	csch_cgrp_t *grp = (csch_cgrp_t *)csch_op_create(sheet, &sheet->direct, CSCH_CTYPE_GRP);
 
+	csch_attrib_plugin_source_c(&src, NULL, 0, 0, "manual_draw_wirenet");
+
 	if (grp == NULL) {
 		rnd_message(RND_MSG_ERROR, "Internal error: failed to create direct group for wirenet\n");
 		return NULL;