src/prng/rand.c

   1 #include <stdlib.h>
   2 #include <stdint.h>
   3
   4 static uint64_t seed;
   5
   6 void srand(unsigned s)
   7 {
   8         seed = s-1;
   9 }
  10
  11 int rand(void)
  12 {
  13         seed = 6364136223846793005ULL*seed + 1;
  14         return seed>>33;
  15 }