+ _ptr = list_to_element(_ptr->list.next))
+
+/**
+ * uci_foreach_entry_safe: like uci_foreach_safe, but safe for deletion
+ * @_list: pointer to the uci_list struct
+ * @_tmp: temporary variable, struct uci_element *
+ * @_ptr: iteration variable, struct uci_element *
+ *
+ * use like a for loop, e.g:
+ * uci_foreach(&list, p) {
+ * ...
+ * }
+ */
+#define uci_foreach_element_safe(_list, _tmp, _ptr) \
+ for(_ptr = list_to_element((_list)->next), \
+ _tmp = list_to_element(_ptr->list.next); \
+ &_ptr->list != (_list); \
+ _ptr = _tmp, _tmp = list_to_element(_ptr->list.next))
+
+/**
+ * uci_list_empty: returns true if a list is empty
+ * @list: list head
+ */
+#define uci_list_empty(list) ((list)->next == (list))
+
+/* wrappers for dynamic type handling */
+#define uci_type_history UCI_TYPE_HISTORY
+#define uci_type_package UCI_TYPE_PACKAGE
+#define uci_type_section UCI_TYPE_SECTION
+#define uci_type_option UCI_TYPE_OPTION
+
+/* element typecasting */
+#ifdef UCI_DEBUG_TYPECAST
+static const char *uci_typestr[] = {
+ [uci_type_history] = "history",
+ [uci_type_package] = "package",
+ [uci_type_section] = "section",
+ [uci_type_option] = "option",
+};
+
+static void uci_typecast_error(int from, int to)
+{
+ fprintf(stderr, "Invalid typecast from '%s' to '%s'\n", uci_typestr[from], uci_typestr[to]);
+}
+
+#define BUILD_CAST(_type) \
+ static inline struct uci_ ## _type *uci_to_ ## _type (struct uci_element *e) \
+ { \
+ if (e->type != uci_type_ ## _type) { \
+ uci_typecast_error(e->type, uci_type_ ## _type); \
+ } \
+ return (struct uci_ ## _type *) e; \
+ }
+
+BUILD_CAST(history)
+BUILD_CAST(package)
+BUILD_CAST(section)
+BUILD_CAST(option)
+
+#else
+#define uci_to_history(ptr) container_of(ptr, struct uci_history, e)
+#define uci_to_package(ptr) container_of(ptr, struct uci_package, e)
+#define uci_to_section(ptr) container_of(ptr, struct uci_section, e)
+#define uci_to_option(ptr) container_of(ptr, struct uci_option, e)
+#endif
+
+/**
+ * uci_alloc_element: allocate a generic uci_element, reserve a buffer and typecast
+ * @ctx: uci context
+ * @type: {package,section,option}
+ * @name: string containing the name of the element
+ * @datasize: additional buffer size to reserve at the end of the struct
+ */
+#define uci_alloc_element(ctx, type, name, datasize) \
+ uci_to_ ## type (uci_alloc_generic(ctx, uci_type_ ## type, name, sizeof(struct uci_ ## type) + datasize))
+
+#define uci_dataptr(ptr) \
+ (((char *) ptr) + sizeof(*ptr))