trooper.c

game.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define for_x for (int x = 0; x < w; x++)
#define for_y for (int y = 0; y < h; y++)
#define for_xy for_x for_y

void show(void* u, int w, int h) {
  int(*univ)[w] = u;
  printf("\033[H");
  for_y {
    for_x printf(univ[y][x] ? "\033[07m  \033[m" : "  ");
    printf("\033[E");
  }
  fflush(stdout);
}

void evolve(void* u, int w, int h) {
  unsigned(*univ)[w] = u;
  unsigned new[h][w];

  for_y for_x {
    int n = 0;
    for (int y1 = y - 1; y1 <= y + 1; y1++)
      for (int x1 = x - 1; x1 <= x + 1; x1++)
        if (univ[(y1 + h) % h][(x1 + w) % w]) n++;

    if (univ[y][x]) n--;
    new[y][x] = (n == 3 || (n == 2 && univ[y][x]));
  }
  for_y for_x univ[y][x] = new[y][x];
}

static char spaceship[] = "                    "
                          "                    "
                          "                    "
                          "    XX  XX          "
                          "      XX            "
                          "      XX            "
                          "   X X  X X         "
                          "   X      X         "
                          "                    "
                          "   X      X         "
                          "    XX  XX          "
                          "     XXXX           "
                          "                    "
                          "      XX            "
                          "      XX            "
                          "                    "
                          "                    "
                          "                    "
                          "                    "
                          "                    ";

static char cloverleaf[] = "                    "
                           "                    "
                           "                    "
                           "                    "
                           "        X X         "
                           "      XXX XXX       "
                           "     X   X   X      "
                           "     X X   X X      "
                           "      XX X XX       "
                           "                    "
                           "      XX X XX       "
                           "     X X   X X      "
                           "     X   X   X      "
                           "      XXX XXX       "
                           "        X X         "
                           "                    "
                           "                    "
                           "                    "
                           "                    "
                           "                    ";

static char* states[] = {cloverleaf, spaceship};

void game(int w, int h, char* state) {
  unsigned univ[h][w];

  for_xy univ[y][x] = *(state++) != ' ';

  unsigned cicles = 2;
  while (--cicles) {
    show(univ, w, h);
    evolve(univ, w, h);
    usleep(100000);
  }
}

int main(int c, char** v) {
  int stateId = c == 2 ? atoi(v[1]) : 0;
  game(20, 20, states[stateId]);
}

trooper.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#define for_x for (int x = 0; x < w; x++)
#define for_y for (int y = 0; y < h; y++)
#define for_yx for_y for_x
#define w 18
#define h 22

void show(void* u) {
  int(*univ)[w] = (int(*)[w])u;
  printf("\033[H");
  for_y {
    for_x printf(univ[y][x] ? "\033[07m  \033[m" : "  ");
    printf("\033[E");
  }
  fflush(stdout);
}

static char state[] =
    "                                         xxxxxxxx         x        x       x          x     x            x    x   "
    "         x    x            x    xxxxxxxxxxxxxx    x xxxx  xxxx x    xxxxx    xxxxx    xx          xx   x xx   xx  "
    " xx x  x  x  x  x  x  x  x   xx    xx   x  x              x   x            x     x  xxxxxx  x       xx      xx    "
    "                                                      ";

void game(char* state) {
  int univ[h][w];
  for_yx univ[y][x] = *(state++) != ' ';
  show(univ);
}

int main(int argc, char** argv) {
  (void)argc;
  (void)argv;
  game(state);
}