Add two headers, one for the general libds stuff and one for vectors.

include/libds.h

@@ -0,0 +1,17 @@
+#ifndef LIBDS_HEADER
+#define LIBDS_HEADER
+
+#include <stdarg.h>
+
+enum libds_result_e {
+  SUCCSESS,
+  MALLOC
+};
+
+typedef enum libds_result_e libds_result;
+typedef int (*compare_func)(void*, void*);
+typedef int (*foreach_func)(void*, va_list);
+
+int compare_always(void* a, void* b);
+
+#endif

include/vec.h

@@ -0,0 +1,25 @@
+#ifndef LIBDS_VEC_HEADER
+#define LIBDS_VEC_HEADER
+
+#define LIBDS_VEC_CAPACITY 4
+
+#include "libds.h"
+
+struct vec_s {
+  void* data;
+  int capacity;
+  int size;
+};
+
+typedef struct vec_s vec;
+
+libds_result vec_init(vec*);
+void vec_free(vec*);
+
+libds_result vec_add(vec*, void*);
+void vec_remove(vec*, void*);
+
+void* vec_find(vec*, void*, compare_func);
+int vec_foreach(vec*, void*, compare_func, foreach_func, ...);
+
+#endif