src/prng/rand_r.c

   1 #include <stdlib.h>
   2
   3 static unsigned temper(unsigned x)
   4 {
   5         x ^= x>>11;
   6         x ^= x<<7 & 0x9D2C5680;
   7         x ^= x<<15 & 0xEFC60000;
   8         x ^= x>>18;
   9         return x;
  10 }
  11
  12 int rand_r(unsigned *seed)
  13 {
  14         return temper(*seed = *seed * 1103515245 + 12345)/2;
  15 }