unit-tests: Add facility to register testable functions

These can be defined in plugins, or other parts of the tested libraries.
They can even be static.

src/libstrongswan/utils/test.c

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2013 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+#include "test.h"
+
+#include <library.h>
+
+/**
+ * A collection of testable functions
+ */
+hashtable_t *testable_functions;
+
+/*
+ * Described in header.
+ */
+void testable_function_register(char *name, void *fn)
+{
+	if (testable_functions)
+	{
+		bool old = FALSE;
+		if (lib->leak_detective)
+		{
+			old = lib->leak_detective->set_state(lib->leak_detective, FALSE);
+		}
+		if (fn)
+		{
+			testable_functions->put(testable_functions, name, fn);
+		}
+		else
+		{
+			testable_functions->remove(testable_functions, name);
+		}
+		if (lib->leak_detective)
+		{
+			lib->leak_detective->set_state(lib->leak_detective, old);
+		}
+	}
+}