refresh

du5/snake.c

@@ -42,6 +42,16 @@ struct snake* remove_snake(struct snake* snake) {
     return snake;
 }
 
+void free_snake(struct snake* sn) {
+    struct snake* walker = sn;
+    struct snake* next_part = NULL;
+    while (walker !=NULL) {
+        next_part = walker->next;
+        free(walker);
+        walker = next_part;
+    }
+}
+
 int is_snake(struct snake* snake, int x, int y) {
     struct snake* current = snake;
 
@@ -54,4 +64,42 @@ int is_snake(struct snake* snake, int x, int y) {
     return 0;
 }
 
+int step_state(struct state* state) {
+    int new_x = state->snake->x + state->sx;
+    int new_y = state->snake->y + state->sy;
+
+    if (new_x < 0 || new_x >= state-> width || new_y < 0 || new_y >= state->height) {
+        return END_WALL;
+    }
+
+    if (is_snake(state->snake, new_x, new_y)) {
+        return END_SNAKE;
+    }
+
+    for (int i = 0; i < FOOD_COUNT; i++) {
+        if (state->foodx[i] == new_x && state->foody[i] == new_y) {
+            state->foodx[i] = -1;
+            state->foody[i] = -1;
+
+            state->snake = add_snake(state->snake, new_x, new_y);
+
+            int any_food_left = 0;
+            for (int j = 0; j < FOOD_COUNT; j++) {
+                if (state->foodx[j] >= 0 && state->foody[j] >= 0) {
+                    any_food_left = 1;
+                    break;
+                }
+            }
+            if (any_food_left) {
+                return END_CONTINUE;
+            } else {
+                return END_FOOD;
+            }
+        }
+    }
+    state->snake = add_snake(state->snake, new_x, new_y);
+    state->snake = remove_snake(state->snake);
+    return END_CONTINUE;
+}
+