Index: uspace/lib/libc/include/io/printf_core.h
===================================================================
--- uspace/lib/libc/include/io/printf_core.h	(revision d2cc7e180f6a8ca583560ae28fcb1beae2fb36a1)
+++ uspace/lib/libc/include/io/printf_core.h	(revision 7b0297b035184452f47c9eb3d0eed27cf2ae6d1b)
@@ -40,13 +40,16 @@
 
 /** Structure for specifying output methods for different printf clones. */
-struct printf_spec {
-	/* Output function, returns count of printed characters or EOF */
-	int (*write)(void *, size_t, void *);
-	/* Support data - output stream specification, its state, locks,... */
+typedef struct printf_spec {
+	/* String output function, returns number of printed characters or EOF */
+	int (*str_write)(const char *, size_t, void *);
+	
+	/* Wide string output function, returns number of printed characters or EOF */
+	int (*wstr_write)(const wchar_t *, size_t, void *);
+	
+	/* User data - output stream specification, state, locks, etc. */
 	void *data;
+} printf_spec_t;
 
-};
-
-int printf_core(const char *fmt, struct printf_spec *ps ,va_list ap);
+int printf_core(const char *fmt, printf_spec_t *ps, va_list ap);
 
 #endif