1 files changed, 34 insertions, 0 deletions
diff --git a/vec.c b/vec.c
new file mode 100644
index 0000000..6962d03
--- /dev/null
+++ b/vec.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "vec.h"
+
+Vec *_Vec_new(Arena *a, int size, ptrdiff_t cap, int align) {
+  Vec *v = new (a, Vec, 1);
+  v->data = alloc(a, cap, size, align);
+  v->size = size;
+  v->align = align;
+  v->cap = cap;
+  v->len = 0;
+  return v;
+}
+
+Vec *Vec_push(Arena *a, Vec *v, void *data) {
+  // printf("push: dest=%p, src=%p, size=%d\n", v->data + v->len * v->size,
+  // data,
+  //        v->size);
+  if (v->len == v->cap) {
+    void *cpy = alloc(a, v->cap * 2, v->size, v->align);
+    memcpy(cpy, v->data, v->len * v->size);
+    v->cap *= 2;
+  }
+  memcpy(v->data + v->len * v->size, data, v->size);
+  v->len++;
+  return v;
+}
+
+void *_Vec_get(Vec *v, int pos) {
+  // printf("get: length=%lu, cap=%lu, pos=%d\n", v->len, v->cap, pos);
+  // printf("get: start=%p, asked=%p\n", v->data, v->data + v->size * pos);
+  return v->data + v->size * pos;
+}