-typedef unsigned char data * va_list ;
-#define va_arg(marker,type) *((type data * )(marker -= sizeof(type)))
-#define va_start(marker,first) { marker = (va_list) ((char data * )&first); }
+typedef unsigned char __data * va_list;
+#define va_start(marker, first) { marker = (va_list)&first; }
+#define va_arg(marker, type) *((type __data * )(marker -= sizeof(type)))