--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util.h	Thu Jan 19 22:39:51 2017 +0100
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2016 Guido Berhoerster <guido+pwm@berhoerster.name>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef	UTIL_H
+#define	UTIL_H
+
+#include <stdlib.h>
+
+#define	EXIT_USAGE	2
+
+#define	COUNTOF(x)	((sizeof (x)/sizeof (0[x])) / ((size_t)(!(sizeof (x) % \
+    sizeof (0[x])))))
+
+void *	xmalloc(size_t);
+void *	xrealloc(void *, size_t);
+char *	xstrdup(const char *);
+char *	xasprintf(char **, const char *, ...);
+
+#endif /* UTIL_H */