util/list: Add list_foreach_entry_from_safe

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5019>

diff --git a/src/util/list.h b/src/util/list.h
index 17800e4..d50eb1e 100644 (file)
--- a/src/util/list.h
+++ b/src/util/list.h
@@ -241,6 +241,13 @@ static inline void list_validate(const struct list_head *list)
        &pos->member != (head);                                         \
        pos = LIST_ENTRY(type, pos->member.next, member))
 
+#define list_for_each_entry_from_safe(type, pos, start, head, member)   \
+   for (type *pos = LIST_ENTRY(type, (start), member),                  \
+            *__next = LIST_ENTRY(type, pos->member.next, member);      \
+       &pos->member != (head);                                         \
+       pos = __next,                                                   \
+       __next = LIST_ENTRY(type, __next->member.next, member))
+
 #define list_for_each_entry_from_rev(type, pos, start, head, member)    \
    for (type *pos = LIST_ENTRY(type, (start), member);                  \
        &pos->member != (head);                                         \