Added extdef.h

diff --git a/extdef.h b/extdef.h
new file mode 100644 (file)
index 0000000..08dae8e
--- /dev/null
+++ b/extdef.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
+ *
+ * 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 St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#ifndef _EXTDEF_H
+#define _EXTDEF_H
+
+#define countof(x) (sizeof(x)/sizeof(x[0]))
+
+#define begin_element(x) (&x[0])
+#define end_element(x) (&x[countof(x)])
+
+#endif /* _EXTDEF_H */