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diff --git a/src/util.h b/src/util.h
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+/*
+
+    atarisio - A UNIX backend for an Atari SIO2PC lead.
+
+    Copyright (C) 2004  Ian Cowburn (ianc@noddybox.demon.co.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    -------------------------------------------------------------------------
+
+    Global utilities and types
+
+*/
+
+#ifndef ATARISIO_UTIL_H
+#define ATARISIO_UTIL_H "$Id$"
+
+#include <stdlib.h>
+
+/* ---------------------------------------- TYPES
+*/
+
+typedef unsigned char	uchar;
+
+
+/* ---------------------------------------- INTERFACES
+*/
+
+/* Returns result from malloc(size), calling exit() if it fails.
+*/
+void		*Malloc(size_t size);
+
+
+/* Returns result from realloc(p,size), calling exit() if it fails.
+*/
+void		*Realloc(void *p, size_t size);
+
+
+/* Copies a string.  The result must be freed.
+*/
+char		*StrCopy(const char *source);
+
+
+/* Set flag TRUE/FALSE depending on the contents of str.
+   'on', 'yes' and '1' are TRUE, 'off', 'no' and '0' false.
+
+   Returns FALSE is str is invalid.
+*/
+int		YesNo(const char *str, int *flag);
+
+
+/* Hex dump to stdout
+*/
+void		HexDump(const uchar *p, size_t len);
+
+
+/* Get an integer from a string
+*/
+int		GetInt(const char *p);
+
+
+/* Returns an Atari serial style checksum.
+*/
+uchar		Checksum(const uchar *p, size_t len);
+
+
+#endif
+
+
+/* END OF FILE */