fix snake using vector and arena

src/main.c

@@ -31,12 +31,12 @@ typedef enum DIRECTION { LEFT, RIGHT, UP, DOWN } DIRECTION;
 typedef struct Snake {
   DIRECTION direction;
   int length;
-  Vector *body;
+  Vector body;
 } Snake;
 
 typedef struct State {
   Snake *player;
-  Vector *fruits;
+  Vector fruits;
   Uint64 last_frame;
 } State;
 
@@ -86,11 +86,9 @@ SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[]) {
   }
   state->player->direction = UP;
   state->player->length = 3;
-  state->player->body = (Vector *)arena_alloc(&arena, 1, sizeof(Vector), _Alignof(Vector));
-  if (!state->player->body) {
-    SDL_Log("Failed to allocate player body");
-    return SDL_APP_FAILURE;
-  }
+  vector_new(&state->player->body);
+  vector_pusha(&state->player->body, (int[]){1, 2, 3}, 3);
+  vector_print(state->player->body);
 
   state->last_frame = SDL_GetTicks();
   *appstate = state;
@@ -131,21 +129,21 @@ void game_step(State *stateptr) {
   // SDL_Log("snek: %d %d %d %d", player->direction, player->length, player->head_index,
   //         player->tail_index);
   Snake *playerptr = stateptr->player;
-  int head = vector_pop(stateptr->player->body);
-  vector_push(stateptr->player->body, head);
+  int head = vector_pop(&stateptr->player->body);
+  vector_push(&stateptr->player->body, head);
 
   switch (playerptr->direction) {
   case RIGHT:
-    vector_push(playerptr->body, head + 1);
+    vector_push(&playerptr->body, head + 1);
     break;
   case UP:
-    vector_push(playerptr->body, head - GRID_WIDTH);
+    vector_push(&playerptr->body, head - GRID_WIDTH);
     break;
   case LEFT:
-    vector_push(playerptr->body, head - 1);
+    vector_push(&playerptr->body, head - 1);
     break;
   case DOWN:
-    vector_push(playerptr->body, head + GRID_WIDTH);
+    vector_push(&playerptr->body, head + GRID_WIDTH);
     break;
   }
 }
@@ -183,7 +181,7 @@ SDL_AppResult SDL_AppIterate(void *appstate) {
 
   SDL_SetRenderDrawColor(renderer, COLOR_SNAKE);
   for (int i = 0; i < playerptr->length; i++) {
-    int b = playerptr->body->data[i];
+    int b = playerptr->body.data[i];
     rect.x = startx + ROW_AT(b) * (rect.w + GRID_PADDING);
     rect.y = starty + COL_AT(b) * (rect.h + GRID_PADDING);
     SDL_RenderFillRect(renderer, &rect);

src/utils/arena.c

@@ -43,7 +43,6 @@ void arena_free(Arena *a) {
   free(a->buffer);
   a->size = 0;
   a->offset = 0;
-  free(a);
 }
 
 // int main(void) {

src/utils/vector.c

@@ -2,25 +2,14 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-void vector_init(Vector **v, int capacity) {
-  *v = malloc(sizeof(Vector));
-  if (!*v) {
-    printf("vector_init: failed to allocate vector pointer\n");
-    return;
-  }
-  (*v)->data = malloc(capacity * sizeof(int));
-  if (!(*v)->data) {
+void vector_init(Vector *v, int capacity) {
+  v->data = malloc(capacity * sizeof(int));
+  if (!v->data) {
     printf("vector_init: failed to allocate data\n");
     return;
   }
-  (*v)->size = 0;
-  (*v)->_capacity = capacity;
-}
-
-Vector *vector_new(void) {
-  Vector *v;
-  vector_init(&v, VEC_MIN);
-  return v;
+  v->size = 0;
+  v->_capacity = capacity;
 }
 
 void vector_grow(Vector *v) {
@@ -61,7 +50,6 @@ void vector_free(Vector *v) {
   free(v->data);
   v->size = 0;
   v->_capacity = 0;
-  free(v);
 }
 
 void vector_print(Vector v) {

src/utils/vector.h

@@ -3,20 +3,22 @@
 
 #define VEC_MIN 8
 
+#define vector_new(v) vector_init(v, VEC_MIN)
+
 typedef struct {
   int *data;
   int size;
   int _capacity;
 } Vector;
 
-void vector_init(Vector **v, int capacity);
-
-Vector *vector_new(void);
+void vector_init(Vector *v, int capacity);
 
 void vector_grow(Vector *v);
 
 void vector_push(Vector *v, int val);
 
+void vector_pusha(Vector *v, int *vals, int n);
+
 int vector_pop(Vector *v);
 
 void vector_free(Vector *v);