--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util.c	Thu Jan 19 22:39:51 2017 +0100
@@ -0,0 +1,83 @@
+/*
+ * 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.
+ */
+
+#include "compat.h"
+
+#ifdef	HAVE_ERR_H
+#include <err.h>
+#endif /* HAVE_ERR_H */
+#include <stdio.h>
+#include <string.h>
+
+#include "util.h"
+
+void *
+xmalloc(size_t size)
+{
+	void	*ptr;
+
+	ptr = malloc(size);
+	if (ptr == NULL) {
+		err(1, "malloc");
+	}
+
+	return (ptr);
+}
+
+void *
+xrealloc(void *ptr, size_t size)
+{
+	ptr = realloc(ptr, size);
+	if (ptr == NULL) {
+		err(1, "realloc");
+	}
+
+	return (ptr);
+}
+
+char *
+xstrdup(const char *str)
+{
+	char	*new;
+
+	new = strdup(str);
+	if (new == NULL) {
+		err(1, "strdup");
+	}
+
+	return (new);
+}
+
+char *
+xasprintf(char **strp, const char *fmt, ...)
+{
+	va_list	args;
+
+	va_start(args, fmt);
+	if (vasprintf(strp, fmt, args) < 0) {
+		err(1, "vasprintf");
+	}
+	va_end(args);
+
+	return (*strp);
+}