add lifeboot.asm skel

[lifeboot.git] / prototype.c

diff --git a/prototype.c b/prototype.c
index c0dd9870b58627b7b7b23bb6634895d8af387b6f..2e9ef3fe12298e26a20eebb77af2c01ce8311e19 100644 (file)
--- a/prototype.c
+++ b/prototype.c
@@ -1,4 +1,8 @@
 #include <stdio.h>
 #include <stdio.h>

+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>

 
 #define COLS 80
 #define ROWS 25
 
 #define COLS 80
 #define ROWS 25


@@ -6,27 +10,114 @@
 #define DEAD ' '
 #define ALIVE '#'
 
 #define DEAD ' '
 #define ALIVE '#'
 

-#define STR(x) _STR(x)
+#define INIT_RATIO 4
+
+#define STR(x) _STR (x)

 #define _STR(x) #x
 
 #define _STR(x) #x
 

-char grid[COLS * ROWS] = { [0 ... (COLS*ROWS-1)] = ALIVE };
+static void
+clearscr ()
+{
+  printf ("\e[1;1H\e[2J");
+}

 
 

-static void print_row(char row[COLS]) {
-  printf("%." STR(COLS) "s\n", row);
+static void
+print_row (char row[COLS])
+{
+  printf ("%." STR (COLS) "s\n", row);

 }
 
 }
 

-static void print_grid(char grid[COLS * ROWS]) {
+static void
+print_grid (char grid[COLS * ROWS])
+{

   for (int i = 0; i < ROWS; i++)
   for (int i = 0; i < ROWS; i++)

-    print_row(grid + i * COLS);
+    print_row (grid + i * COLS);
+}
+
+static void
+init_grid (char grid[COLS * ROWS])
+{
+  for (int i = 0; i < COLS * ROWS; i++)
+    {
+      if (rand () % INIT_RATIO)
+        grid[i] = DEAD;
+      else
+        grid[i] = ALIVE;
+    }
+}
+
+static char
+get_state (char grid[COLS * ROWS], int row, int col)
+{
+  if (row < 0 || row >= ROWS || col < 0 || col >= COLS)
+    return DEAD;
+
+  return grid[row * COLS + col];
+}
+
+static int
+alive_neighbours (char grid[COLS * ROWS], int idx)
+{
+  int row = idx / COLS;
+  int col = idx % COLS;
+  int neighbours = 0;
+
+  for (int i = -1; i <= 1; i++)
+    for (int j = -1; j <= 1; j++)
+      if (get_state (grid, row + i, col + j) == ALIVE)
+        neighbours++;
+
+  if (get_state (grid, row, col) == ALIVE)
+    neighbours--;
+
+  return neighbours;

 }
 
 }
 

-static void clearscr() {
-  printf("\e[1;1H\e[2J");
+static char
+next_state (char grid[COLS * ROWS], int idx)
+{
+  int n = alive_neighbours (grid, idx);
+
+  if (get_state (grid, idx / COLS, idx % COLS) == ALIVE)
+    {
+      if (n < 2 || n > 3)
+        return DEAD;
+
+      return ALIVE;
+    }
+
+  if (n == 3)
+    return ALIVE;
+
+  return DEAD;

 }
 
 }
 

-int main () {
-  clearscr();
-  print_grid(grid);
+static void
+update_grid (char grid[COLS * ROWS])
+{
+  char new[COLS * ROWS];
+
+  for (int i = 0; i < COLS * ROWS; i++)
+    new[i] = next_state (grid, i);
+
+  memcpy (grid, new, COLS * ROWS);
+}
+
+int
+main ()
+{
+  char grid[COLS * ROWS];
+
+  srand (time (0));
+  init_grid (grid);
+
+  do
+    {
+      clearscr ();
+      print_grid (grid);
+      update_grid (grid);
+    }
+  while (getchar () != 'q');

 
   return 0;
 }
 
   return 0;
 }