improved functions; added header file

1 files changed, 18 insertions, 12 deletions

diff --git a/util/arr.c b/util/arr.c
index 6cbf9eb..f8da701 100644
--- a/util/arr.c
+++ b/util/arr.c
@@ -6,20 +6,20 @@ typedef struct {
 	size_t item_sz;
 } Array;
 
-void arr_create(Array *arr, size_t item_sz) {
+static void arr_create(Array *arr, size_t item_sz) {
 	arr->len = arr->cap = 0;
 	arr->item_sz = item_sz;
 	arr->data = NULL;
 	arr->last = NULL;
 }
 
-void arr_reserve(Array *arr, size_t n) {
+static void arr_reserve(Array *arr, size_t n) {
 	arr->cap = n;
 	arr->data = realloc(arr->data, arr->item_sz * arr->cap);
 	arr->last = (void*)((char*)arr->data + arr->item_sz * (arr->len - 1));
 }
 
-void *arr_add(Array *arr) {
+static void *arr_add(Array *arr) {
 	if (arr->len >= arr->cap) {
 		arr_reserve(arr, (arr->cap + 2) * 2);
 	}
@@ -29,20 +29,26 @@ void *arr_add(Array *arr) {
 	return item;
 }
 
-void arr_remove_last(Array *arr) {
-	arr->len--;
-	/* OPTIM (memory): Shorten array. */
+static void arr_clear(Array *arr) {
+	free(arr->data);
+	arr->len = arr->cap = 0;
+	arr->data = NULL;
+	arr->last = NULL;
 }
 
-void arr_free(Array *arr) {
-	free(arr->data);
+static void arr_remove_last(Array *arr) {
+	/* OPTIM (memory): Shorten array. */
+	arr->len--;
+	if (arr->len) {
+		arr->last = (char*)arr->last - arr->item_sz;
+    } else {
+		arr_clear(arr);
+	}
+	
 }
 
-void arr_clear(Array *arr) {
+static void arr_free(Array *arr) {
 	free(arr->data);
-	arr->len = arr->cap = 0;
-	arr->data = NULL;
-	arr->last = NULL;
 }
 
 #define arr_foreach(arr, type, var) for (type *var = (arr)->data; var; var == (arr)->last ? var = NULL : var++)