--- deliantra/server/include/util.h	2007/01/15 00:40:49	1.27
+++ deliantra/server/include/util.h	2007/01/15 02:39:41	1.31
@@ -8,6 +8,7 @@
 #endif
 
 #include <cstddef>
+#include <cmath>
 #include <new>
 #include <vector>
 
@@ -34,6 +35,48 @@
 #define IN_RANGE_EXC(val,beg,end) \
   ((unsigned int)(val) - (unsigned int)(beg) <  (unsigned int)(end) - (unsigned int)(beg))
 
+void fork_abort (const char *msg);
+
+// this is much faster than crossfires original algorithm
+// on modern cpus
+inline int
+isqrt (int n)
+{
+  return (int)sqrtf ((float)n);
+}
+
+// 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.
+#else
+// and has a max. error of 9 in the range -100..+100.
+#endif
+inline int 
+idistance (int dx, int dy)
+{ 
+  unsigned int dx_ = abs (dx);
+  unsigned int dy_ = abs (dy);
+
+#if 0
+  return dx_ > dy_
+      ? (dx_ * 61685 + dy_ * 26870) >> 16
+      : (dy_ * 61685 + dx_ * 26870) >> 16;
+#else
+  return dx_ + dy_ - min (dx_, dy_) * 5 / 8;
+#endif
+}
+
+/*
+ * absdir(int): Returns a number between 1 and 8, which represent
+ * the "absolute" direction of a number (it actually takes care of
+ * "overflow" in previous calculations of a direction).
+ */
+inline int
+absdir (int d)
+{
+  return ((d - 1) & 7) + 1;
+}
+
 // makes dynamically allocated objects zero-initialised
 struct zero_initialised
 {