Add arena allocator library

libarena/arena.h

@@ -0,0 +1,25 @@
+#ifndef _LIBARENA_ARENA_H
+#define _LIBARENA_ARENA_H
+
+#include <stddef.h>
+
+#define ARENA_CHUNK_CAPACITY (8 * 1024)
+
+struct arena_chunk {
+  struct arena_chunk* next;
+  size_t capacity;
+  size_t size;
+  uintptr_t memory[];
+};
+
+struct arena {
+  struct arena_chunk *begin, *end;
+};
+
+void arena_reset (struct arena* arena);
+
+void arena_destroy (struct arena* arena);
+
+void* arena_malloc (struct arena* arena, size_t size);
+
+#endif // _LIBARENA_ARENA_H