--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util.c	Tue Feb 04 13:35:52 2020 +0100
@@ -0,0 +1,53 @@
+/*
+ * util.c -- various utilities
+ *
+ * Copyright (c) 2020 David Demelier <markand@malikania.fr>
+ * 
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdnoreturn.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "util.h"
+
+noreturn void
+die(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+
+	exit(1);
+}
+
+char *
+estrdup(const char *str)
+{
+	assert(str);
+
+	char *ret;
+	size_t length = strlen(str);
+
+	if (!(ret = calloc(1, length + 1)))
+		die(strerror(errno));
+
+	return strcpy(ret, str);
+}