Switch PRNG from BSD random() to Mersenne Twister

[empserver] / src / lib / gen / chance.c

diff --git a/src/lib/gen/chance.c b/src/lib/gen/chance.c
index ae27bc46e4686f847d0789c1ed4e416bc38e22bd..2a00789fd0b2e4a1094271fc5c52e7970736e1b5 100644 (file)
--- a/src/lib/gen/chance.c
+++ b/src/lib/gen/chance.c
@@ -35,6 +35,7 @@
 #include <math.h>
 #include <stdlib.h>
 #include "chance.h"
+#include "mt19937ar.h"
 
 /*
  * Return non-zero with probability D.
@@ -42,7 +43,7 @@
 int
 chance(double d)
 {
-    return d > (random() % 32768) / 32768.0;
+    return d > genrand_real2();
 }
 
 /*
@@ -78,7 +79,7 @@ roll0(int n)
     int r;
 
     do
-       r = random() & (pow2 - 1);
+       r = genrand_int32() & (pow2 - 1);
     while (r >= n);
     return r;
 }
@@ -112,5 +113,5 @@ roundavg(double val)
 void
 seed_prng(unsigned seed)
 {
-    srandom(seed);
+    init_genrand(seed);
 }