vector.c

typedef struct {
  int *data; // array
  int cap;   // capacity
  int len;   // length
} Vector;

Vector * vector_create(int length, int capacity) {
  Vector *v = malloc(sizeof(Vector));
  if (v == NULL) {
    return NULL;
  }
  v->cap = capacity;
  v->len = length;
  v->data = malloc(sizeof(int)*capacity);
  if (v->data == NULL) {
    free(v);
    return NULL;
  }
  return v;
}

int vector_delete(Vector *v) {
  free(v->data);
  free(v);
}

int vector_set(Vector *v, int index, int value) {
  if (index >= v->len) {
    return -1;
  }
  v->data[index] = value;
  return 0;
}

int vector_get(Vector *v, int index, int **dest) {
  if (index >= v->len) {
    return -1;
  }
  *dest = &v->data[index];
  return 0;
}

int vector_length(Vector *v) {
  return v->len;
}

int vector_capacity(Vector *v) {
  return v->cap;
}

int vector_grow(Vector *v, int cap) {
  int *data = malloc(sizeof(int) * cap);
  if (data == NULL) {
    return -1;
  }
  int i;
  for (i = 0; i < v->len; i++) {
    data[i] = v->data[i];
  }
  v->data = data;
  v->cap = cap;
  return 0;
};

int vector_append(Vector *v, int value) {
  if (v->cap == v->len) {
    vector_grow(v, v->cap * 2);
  }
  v->data[v->len] = value;
  v->len++;
  return 0;
}