sslist remove item at index

lib/sllist/src/remove.c

@@ -14,6 +14,32 @@ static inline void swap_items(sl_list *list, struct sl_list_item *pos, int datai
 	i->data[size - _i] = tmp;
 }
 
+void *sllist_removeat(sl_list *list, unsigned int _pos)
+{
+	void *result;
+	struct sl_list_item *pos = list->first;
+	struct sl_list_item *lastptr;
+	int i;
+
+	if (_pos >= sllist_count(list))
+		return NULL;
+	for (i =0; i + SL_LIST_BUFLEN < _pos; i += SL_LIST_BUFLEN)
+		pos = pos->next;
+	_pos -= i;
+	if (_pos == sllist_count(list) -1)
+	{
+		list->count--;
+		return pos->data[_pos];
+	}
+	for (lastptr = pos; i + SL_LIST_BUFLEN < sllist_count(list); i += SL_LIST_BUFLEN)
+		lastptr = lastptr->next;
+	i = sllist_count(list) - i;
+	result = pos->data[_pos];
+	pos->data[_pos] = lastptr->data[i];
+	list->count--;
+	return result;
+}
+
 int sllist_remove(sl_list *list, int (*fnc)(const void *a, const void *b), void *item)
 {
 	return sllist_n_remove(list, fnc, item, sllist_count(list));

test/sllist/main.c

@@ -64,7 +64,10 @@ static inline int test_add()
 	i = 2047;
 	_assertEqual(sllist_find(a, sllist_cmp_int, (void*)i), 1023);
 	_assertEqual(sllist_remove(a, sllist_cmp_int, (void*)i), 1);
+	_assertEqual(sllist_count(a), 1023);
 	_assertEqual(sllist_find(a, sllist_cmp_int, (void*)i), -1);
+	_assertEqual(sllist_removeat(a, 0), 1)
+	_assertEqual(sllist_count(a), 1022);
 	while (sllist_count(a))
 		sllist_popback(a);
 	for (i=0; i < 1024; ++i)