1 files changed, 77 insertions, 0 deletions
diff --git a/drunkard.c b/drunkard.c
new file mode 100644
index 0000000..2427249
--- /dev/null
+++ b/drunkard.c
@@ -0,0 +1,77 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+#define HEIGHT      50
+#define WIDTH       50
+#define MAX_STEPS   50
+#define NUM_WALKERS 100
+
+enum direction {
+    UP,
+    LEFT,
+    RIGHT,
+    DOWN,
+    NUM_DIRS,
+};
+
+struct point {
+    int x;
+    int y;
+};
+
+int main(void)
+{
+    bool map[HEIGHT][WIDTH];
+    for (int i = 0; i < HEIGHT; ++i) {
+        for (int j = 0; j < WIDTH; ++j) {
+            map[i][j] = false;
+        }
+    }
+
+    int start_x = WIDTH / 2;
+    int start_y = HEIGHT / 2;
+
+    int          open_tiles = 1;
+    struct point open[HEIGHT * WIDTH];
+    struct point p = {.x = start_x, .y = start_y};
+    open[0]        = p;
+
+    srand(time(NULL));
+
+    for (int i = 0; i < NUM_WALKERS; ++i) {
+        struct point curr_point = open[rand() % open_tiles];
+        int          x_pos      = curr_point.x;
+        int          y_pos      = curr_point.y;
+
+        for (int j = 0; j < MAX_STEPS && x_pos < WIDTH && x_pos >= 0 &&
+                        y_pos < HEIGHT && y_pos >= 0;
+             ++j) {
+            if (!map[y_pos][x_pos]) {
+                map[y_pos][x_pos]  = true;
+                struct point p     = {.x = x_pos, .y = y_pos};
+                open[open_tiles++] = p;
+            }
+            enum direction dir = rand() % NUM_DIRS;
+            switch (dir) {
+            case UP : --y_pos; break;
+            case LEFT : --x_pos; break;
+            case RIGHT : ++x_pos; break;
+            case DOWN : ++y_pos; break;
+            default : exit(EXIT_FAILURE); // should not occur
+            }
+        }
+    }
+
+    for (int i = 0; i < HEIGHT; ++i) {
+        for (int j = 0; j < WIDTH; ++j) {
+            if (map[i][j]) {
+                printf("#");
+            } else {
+                printf(".");
+            }
+        }
+        printf("\n");
+    }
+}