[ViewVC] Diff of: cvs/deliantra/server/include/util.h

Comparing deliantra/server/include/util.h (file contents):
Revision 1.83 by root, Tue Dec 30 07:24:16 2008 UTC vs.
Revision 1.93 by root, Sat Nov 7 18:30:05 2009 UTC

 /*
  * This file is part of Deliantra, the Roguelike Realtime MMORPG.
  *
  * Copyright (©) 2005,2006,2007,2008 Marc Alexander Lehmann / Robin Redeker / the Deliantra team
  *
- * Deliantra is free software: you can redistribute it and/or modify
+ * Deliantra is free software: you can redistribute it and/or modify it under
- * it under the terms of the GNU General Public License as published by
+ * the terms of the Affero GNU General Public License as published by the
- * the Free Software Foundation, either version 3 of the License, or
+ * Free Software Foundation, either version 3 of the License, or (at your
- * (at your option) any later version.
+ * 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
+ * You should have received a copy of the Affero GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ * and the GNU General Public License along with this program. If not, see
+ * <http://www.gnu.org/licenses/>.
  *
  * The authors can be reached via e-mail to <support@deliantra.net>
  */
 #ifndef UTIL_H__
 #define UTIL_H__
+#include <compiler.h>
 #define DEBUG_POISON 0x00 // poison memory before freeing it if != 0
 #define DEBUG_SALLOC  0   // add a debug wrapper around all sallocs
 #define PREFER_MALLOC 0   // use malloc and not the slice allocator
-#if __GNUC__ >= 3
-# 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 expect(expr,value)         (expr)
-# define prefetch(addr,rw,locality)
-#endif
-#if __GNUC__ < 4 || (__GNUC__ == 4 || __GNUC_MINOR__ < 4)
-# define decltype(x) typeof(x)
-#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 <pthread.h>
 #include <cstddef>
 #include <cmath>
 // sign0 returns -1, 0 or +1
 template<typename T>
 static inline T sign0 (T v) { return v ? sign (v) : 0; }
+// div* only work correctly for div > 0
 // div, with correct rounding (< 0.5 downwards, >=0.5 upwards)
-template<typename T> static inline T div    (T val, T div) { return (val + div / 2) / div; }
+template<typename T> static inline T div    (T val, T div)
+{
+  return expect_false (val < 0) ? - ((-val + (div - 1) / 2) / div) : (val + div / 2) / div;
+}
 // div, round-up
-template<typename T> static inline T div_ru (T val, T div) { return (val + div - 1) / div; }
+template<typename T> static inline T div_ru (T val, T div)
+{
+  return expect_false (val < 0) ? - ((-val                ) / div) : (val + div - 1) / div;
+}
 // div, round-down
-template<typename T> static inline T div_rd (T val, T div) { return (val          ) / div; }
+template<typename T> static inline T div_rd (T val, T div)
+{
+  return expect_false (val < 0) ? - ((-val + (div - 1)    ) / div) : (val          ) / div;
+}
+// lerp* only work correctly for min_in < max_in
+// Linear intERPolate, scales val from min_in..max_in to min_out..max_out
 template<typename T>
 static inline T
 lerp (T val, T min_in, T max_in, T min_out, T max_out)
 {
   return min_out + div   <T> ((val - min_in) * (max_out - min_out), max_in  - min_in);
 // on modern cpus
 inline int
 isqrt (int n)
 {
   return (int)sqrtf ((float)n);
+}
+// this is kind of like the ^^ operator, if it would exist, without sequence point.
+// more handy than it looks like, due to the implicit !! done on its arguments
+inline bool
+logical_xor (bool a, bool b)
+{
+  return a != b;
+}
+inline bool
+logical_implies (bool a, bool b)
+{
+  return a <= b;
 }
 // this is only twice as fast as naive sqrtf (dx*dy+dy*dy)
 #if 0
 // and has a max. error of 6 in the range -100..+100.
 // Xorshift RNGs, George Marsaglia
 // http://www.jstatsoft.org/v08/i14/paper
 // this one is about 40% faster than the tausworthe one above (i.e. not much),
 // despite the inlining, and has the issue of only creating 2**32-1 numbers.
+// see also http://www.iro.umontreal.ca/~lecuyer/myftp/papers/xorshift.pdf
 struct xorshift_random_generator
 {
   uint32_t x, y;
   void operator =(const xorshift_random_generator &src)
 struct str_hash
 {
   std::size_t operator ()(const char *s) const
   {
-    unsigned long hash = 0;
+#if 0
+    uint32_t hash = 0;
     /* use the one-at-a-time hash function, which supposedly is
      * better than the djb2-like one used by perl5.005, but
      * certainly is better then the bug used here before.
      * see http://burtleburtle.net/bob/hash/doobs.html
       }
     hash += hash <<  3;
     hash ^= hash >> 11;
     hash += hash << 15;
+#else
+    // use FNV-1a hash (http://isthe.com/chongo/tech/comp/fnv/)
+    // it is about twice as fast as the one-at-a-time one,
+    // with good distribution.
+    // FNV-1a is faster on many cpus because the multiplication
+    // runs concurrent with the looping logic.
+    uint32_t hash = 2166136261;
+    while (*s)
+      hash = (hash ^ *s++) * 16777619;
+#endif
     return hash;
   }
 };
     erase (&obj);
   }
 };
 // basically does what strncpy should do, but appends "..." to strings exceeding length
+// returns the number of bytes actually used (including \0)
-void assign (char *dst, const char *src, int maxlen);
+int assign (char *dst, const char *src, int maxsize);
 // type-safe version of assign
 template<int N>
-inline void assign (char (&dst)[N], const char *src)
+inline int assign (char (&dst)[N], const char *src)
 {
-  assign ((char *)&dst, src, N);
+  return assign ((char *)&dst, src, N);
 }
 typedef double tstamp;
 // return current time as timestamp
 tstamp now ();
 int similar_direction (int a, int b);
-// like sprintf, but returns a "static" buffer
+// like v?sprintf, but returns a "static" buffer
-const char *format (const char *format, ...);
+char *vformat (const char *format, va_list ap);
+char *format (const char *format, ...) attribute ((format (printf, 1, 2)));
+// safety-check player input which will become object->msg
+bool msg_is_safe (const char *msg);
 /////////////////////////////////////////////////////////////////////////////
 // threads, very very thin wrappers around pthreads
 struct thread

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Comparing deliantra/server/include/util.h (file contents): Revision 1.83 by root, Tue Dec 30 07:24:16 2008 UTC vs. Revision 1.93 by root, Sat Nov 7 18:30:05 2009 UTC

Diff Legend

Comparing deliantra/server/include/util.h (file contents):
Revision 1.83 by root, Tue Dec 30 07:24:16 2008 UTC vs.
Revision 1.93 by root, Sat Nov 7 18:30:05 2009 UTC