#include <string.h>

#include "../include/assert.h"
#include "../include/types.h"
#include "../include/vec.h"

Vec _Vec_new(Arena *a, size tsize, size cap, size align) {
    assert(cap > 0, "negative cap");
    Vec v = {0};
    v.tsize = tsize;
    v.cap = cap;
    v.align = align;
    v.len = 0;
    v.data = alloc(a, cap, tsize, align);
    return v;
}

void Vec_push(Arena *a, Vec *v, void *data) {
    if (v->len == v->cap) {
        void *cpy = alloc(a, v->cap * 2, v->tsize, v->align);
        memcpy(cpy, v->data, v->len * v->tsize);
        v->cap *= 2;
        v->data = cpy;
    }
    memcpy(v->data + v->len * v->tsize, data, v->tsize);
    v->len++;
}