From: Alan T. DeKok <aland@freeradius.org>
Date: Tue, 5 Apr 2022 22:25:32 +0000 (-0400)
Subject: add function to get tlist from dlist head
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=beb12e090503fe55839445509fa449ed299d803b;p=thirdparty%2Ffreeradius-server.git

add function to get tlist from dlist head

because a lot of dlist callbacks give the dlist head, and we
sometimes wish to convert that back to a tlist
---

diff --git a/src/lib/util/tlist.h b/src/lib/util/tlist.h
index baa45c0d3f..d22ec9dbdb 100644
--- a/src/lib/util/tlist.h
+++ b/src/lib/util/tlist.h
@@ -65,6 +65,14 @@ static inline void *fr_tlist_entry_to_item(size_t offset, fr_tlist_t const *entr
 	return (void *)(((uintptr_t) entry) - offset);
 }
 
+/** Get a fr_tlist_head_t from a fr_dlist_head_t
+ *
+ */
+static inline fr_tlist_head_t *fr_tlist_head_from_dlist(fr_dlist_head_t *dlist_head)
+{
+	return (fr_tlist_head_t *)(((uintptr_t) dlist_head) - offsetof(fr_tlist_head_t, dlist_head));
+}
+
 /** Initialise a linked list without metadata
  *
  */