--- deliantra/server/include/util.h	2007/04/21 23:03:54	1.42
+++ deliantra/server/include/util.h	2007/05/28 21:15:56	1.46
@@ -1,14 +1,46 @@
+/*
+ * This file is part of Crossfire TRT, the Multiplayer Online Role Playing Game.
+ * 
+ * Copyright (©) 2005,2006,2007 Marc Alexander Lehmann / Robin Redeker / the Crossfire TRT team
+ * 
+ * Crossfire TRT 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 Crossfire TRT; if not, write to the Free Software Foundation, Inc. 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ * 
+ * The authors can be reached via e-mail to <crossfire@schmorp.de>
+ */
+
 #ifndef UTIL_H__
 #define UTIL_H__
 
 //#define PREFER_MALLOC
 
 #if __GNUC__ >= 3
-# define is_constant(c) __builtin_constant_p (c)
+# define is_constant(c)             __builtin_constant_p (c)
+# define expect(expr,value)         __builtin_expect ((expr),(value))
+# define prefetch(addr,rw,locality) __builtin_prefetch (addr, rw, locality)
 #else
-# define is_constant(c) 0
+# define is_constant(c)             0
+# define expect(expr,value)         (expr)
+# define prefetch(addr,rw,locality)
 #endif
 
+// put into ifs if you are very sure that the expression
+// is mostly true or mosty false. note that these return
+// booleans, not the expression.
+#define expect_false(expr) expect ((expr) != 0, 0)
+#define expect_true(expr)  expect ((expr) != 0, 1)
+
 #include <cstddef>
 #include <cmath>
 #include <new>
@@ -47,6 +79,13 @@
 
 template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
 
+template<typename T>
+static inline T
+lerp (T val, T min_in, T max_in, T min_out, T max_out)
+{
+  return (val - min_in) * (max_out - min_out) / (max_in - min_in) + min_out;
+}
+
 // lots of stuff taken from FXT
 
 /* Rotate right. This is used in various places for checksumming */
@@ -436,5 +475,8 @@
 
 int similar_direction (int a, int b);
 
+// like printf, but returns a std::string
+const std::string format (const char *format, ...);
+
 #endif