lib/list: Add list_for_each_entry_safe

[petitboot] / lib / list / list.h

diff --git a/lib/list/list.h b/lib/list/list.h
index d93f8a88021183a25ca3b4c35e8accca664b469b..97fb615cdb9fd1bc8361c876c2e063fb11a41b32 100644 (file)
--- a/lib/list/list.h
+++ b/lib/list/list.h
@@ -27,22 +27,37 @@ struct list {
        ? NULL \
        : container_of(_ptr, _type, _member))
 
+#define list_prev_entry(_list, _pos, _member) \
+       list_entry(_pos->_member.prev, typeof(*_pos), _member, _list)
+
+#define list_next_entry(_list, _pos, _member) \
+       list_entry(_pos->_member.next, typeof(*_pos), _member, _list)
+
 #define list_for_each_entry(_list, _pos, _member) \
        for (_pos = list_entry((_list)->head.next, typeof(*_pos), _member, _list); \
-               _pos; \
-               _pos = list_entry(_pos->_member.next, typeof(*_pos), _member, _list))
+               _pos; _pos = list_next_entry(_list, _pos, _member))
 
 #define list_for_each_entry_continue(_list, _pos, _member) \
-       for (; _pos; \
-               _pos = list_entry(_pos->_member.next, typeof(*_pos), _member, _list))
+       for (; _pos; _pos = list_next_entry(_list, _pos, _member))
 
-#define STATIC_LIST(_list) static struct list _list = { \
+#define list_for_each_entry_safe(_list, _pos, _tmp, _member) \
+       for (_pos = container_of((_list)->head.next, typeof(*_pos), _member), \
+               _tmp = container_of(_pos->_member.next, typeof(*_pos), \
+                               _member); \
+            &_pos->_member != &(_list)->head; \
+            _pos = _tmp, \
+               _tmp = list_entry(_tmp->_member.next, typeof(*_pos), \
+                               _member, _list))
+
+#define DEFINE_LIST(_list) struct list _list = { \
        .head = { \
                .next = &_list.head, \
                .prev = &_list.head \
        } \
 }
 
+#define STATIC_LIST(_list) static DEFINE_LIST(_list)
+
 void list_init(struct list *list);
 void list_insert_before(struct list_item *next, struct list_item *item);
 void list_insert_after(struct list_item *prev, struct list_item *item);