Provide optional prototypes for all three keyboard input related func…

…tions.

core/ctk/ctk.c

@@ -44,7 +44,7 @@
  *
  * This file is part of the Contiki operating system.
  *
- * $Id: ctk.c,v 1.24 2009/02/28 10:43:30 oliverschmidt Exp $
+ * $Id: ctk.c,v 1.25 2010/01/31 12:48:46 oliverschmidt Exp $
  *
  */
 
@@ -100,8 +100,16 @@ static unsigned char iconx, icony;
 #define ICONY_MAX    height
 #endif /* CTK_CONF_ICONS */
 
+#ifndef ctk_arch_keyavail
+unsigned char ctk_arch_keyavail(void);
+#endif /* ctk_arch_keyavail */
+
+#ifndef ctk_arch_getkey
+ctk_arch_key_t ctk_arch_getkey(void);
+#endif /* ctk_arch_getkey */
+
 #ifndef ctk_arch_isprint
-unsigned char ctk_arch_isprint(char c);
+unsigned char ctk_arch_isprint(ctk_arch_key_t key);
 #endif /* ctk_arch_isprint */
 
 PROCESS(ctk_process, "CTK Contiki GUI");