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#include <stdio.h>
#define W 60
#define H 40
typedef unsigned char Board[W*H/8];
static Board board;
static _Bool
get(Board *b, unsigned x, unsigned y) {
x %= W; y %= H;
unsigned idx = x + y * W;
return (*b)[idx/8] & (1 << (idx % 8));
}
static void
set(Board *b, unsigned x, unsigned y, _Bool set) {
x %= W; y %= H;
unsigned idx = x + y * W;
(*b)[idx/8] &= ~(1 << (idx % 8));
if (set)
(*b)[idx/8] |= (1 << (idx % 8));
}
static void
next(Board *b) {
Board temp;
memcpy(temp, &**b, sizeof temp);
for (int y = 0; y < H; ++y)
for (int x = 0; x < W; ++x) {
#define C(ox, oy) get(&temp, x + ox, y + oy)
int n = C(-1,-1) + C(0,-1) + C(1,-1)
+ C(-1, 0) + C(1, 0)
+ C(-1, 1) + C(0, 1) + C(1, 1);
set(b, x, y, 0);
if (get(&temp, x, y))
set(b, x, y, n == 3);
else if (n == 2)
set(b, x, y, 1);
else if (n == 3)
set(b, x, y, 1);
}
}
static
void draw(Board *b) {
printf("\x1B[H\n");
printf("\n");
for (int y = 0; y < H; ++y) {
printf(" ");
for (int x = 0; x < W; ++x) {
if (get(b, x, y)) {
printf("W");
} else {
printf(" ");
}
}
printf(" \n");
}
}
static void
init(Board *b) {
int time(void *);
unsigned rnd = time(0);
for (int y = 0; y < H; ++y) {
for (int x = 0; x < W; ++x) {
set(b, x, y, (_Bool)((rnd >> 31) & 1));
rnd = (rnd * 134775813) + 1;
}
}
}
void usleep(unsigned);
int main () {
init(&board);
for (;;) {
draw(&board);
usleep(100);
next(&board);
}
}
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