1 files changed, 61 insertions, 0 deletions
diff --git a/archive/arr.c b/archive/arr.c
new file mode 100644
index 0000000..2555d72
--- /dev/null
+++ b/archive/arr.c
@@ -0,0 +1,61 @@
+typedef struct {
+	void *data;
+	size_t len;
+	size_t cap;
+	size_t item_sz;
+} Array;
+
+static void arr_create(Array *arr, size_t item_sz) {
+	arr->len = arr->cap = 0;
+	arr->item_sz = item_sz;
+	arr->data = NULL;
+}
+
+static inline void arr_reserve(Array *arr, size_t n) {
+	arr->cap = n;
+	arr->data = err_realloc(arr->data, arr->item_sz * arr->cap);
+}
+
+/* like arr_reserve, but sets the length of the array too */
+static inline void arr_set_len(Array *arr, size_t n) {
+	arr->len = arr->cap = n;
+	arr->data = err_realloc(arr->data, arr->item_sz * arr->cap);
+}
+
+static inline void *arr_last(Array *arr) {
+	if (arr->data)
+		return (void*)((char*)arr->data + arr->item_sz * (arr->len - 1));
+	else
+		return NULL;
+}
+
+static void *arr_add(Array *arr) {
+	if (arr->len >= arr->cap) {
+		arr_reserve(arr, (arr->cap + 1) * 2);
+	}
+	arr->len++;
+	return (void*)((char*)arr->data + arr->item_sz * (arr->len - 1));
+}
+
+static void arr_clear(Array *arr) {
+	free(arr->data);
+	arr->len = arr->cap = 0;
+	arr->data = NULL;
+}
+
+static void arr_remove_last(Array *arr) {
+	/* OPTIM (memory): Shorten array. */
+	arr->len--;
+	if (!arr->len) {
+		arr_clear(arr);
+	}
+	
+}
+
+static void arr_free(Array *arr) {
+	free(arr->data);
+}
+
+/* NOTE: this will not work if type is a pointer! */
+#define arr_foreach(arr, type, var) for (type *var = (arr)->data, *var##_foreach_last = arr_last(arr); var; var == var##_foreach_last ? var = NULL : var++)
+#define arr_foreach_reverse(arr, type, var) for (type *var = arr_last(arr); var; var == (arr)->data ? var = NULL : var--)