toaruos/libc/stdlib/rand.c

23 lines
365 B
C

#include <stdint.h>
#include <stdlib.h>
#include <math.h>
static uint32_t x = 123456789;
static uint32_t y = 362436069;
static uint32_t z = 521288629;
static uint32_t w = 88675123;
int rand(void) {
uint32_t t;
t = x ^ (x << 11);
x = y; y = z; z = w;
w = w ^ (w >> 19) ^ t ^ (t >> 8);
return (w & RAND_MAX);
}
void srand(unsigned int seed) {
w ^= seed;
}