--- /dev/null
+#ifndef fooutilhfoo
+#define fooutilhfoo
+
+/***
+ This file is part of catta.
+
+ catta is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ catta 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 Lesser General
+ Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with catta; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#include <inttypes.h>
+
+#include <catta/cdecl.h>
+
+CATTA_C_DECL_BEGIN
+
+void catta_hexdump(const void *p, size_t size);
+
+char *catta_format_mac_address(char *t, size_t l, const uint8_t* mac, size_t size);
+
+/** Change every character in the string to upper case (ASCII), return a pointer to the string */
+char *catta_strup(char *s);
+
+/** Change every character in the string to lower case (ASCII), return a pointer to the string */
+char *catta_strdown(char *s);
+
+CATTA_C_DECL_END
+
+#endif