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diff --git a/alert_box.c b/alert_box.c
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+/* alert_box.c
+ * Routines to put up various "standard" alert boxes used in multiple
+ * places
+ *
+ * $Id: alert_box.c,v 1.1 2004/02/11 00:55:26 guy Exp $
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <glib.h>
+
+#include <epan/dfilter/dfilter.h>
+
+#include "alert_box.h"
+
+#include "simple_dialog.h"
+
+/*
+ * Alert box for an invalid display filter expression.
+ * Assumes "dfilter_error_msg" has been set by "dfilter_compile()" to the
+ * error message for the filter.
+ *
+ * XXX - should this have a "Help" button that pops up the display filter
+ * help?
+ */
+void
+bad_dfilter_alert_box(const char *dftext)
+{
+  simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK, 
+                "%s%s%s\n"
+                "\n"
+                "The filter expression \"%s\" is not a valid display filter.\n"
+                "See the help for a description of the display filter syntax.",
+                simple_dialog_primary_start(), dfilter_error_msg,
+                simple_dialog_primary_end(), dftext);
+}