From: Jason Ekstrand <jason.ekstrand@intel.com>
Date: Thu, 30 Jul 2015 18:28:22 +0000 (-0700)
Subject: util/list: Add list splicing functions
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f15be18c9210bfecd5d00819ed9edcdb4a667ffc;p=mesa.git

util/list: Add list splicing functions

This adds functions for splicing one list into another.  These have
more-or-less the same API as the kernel list splicing functions.
---

diff --git a/src/util/list.h b/src/util/list.h
index b98ce59ff77..d4b485174fc 100644
--- a/src/util/list.h
+++ b/src/util/list.h
@@ -108,6 +108,28 @@ static inline unsigned list_length(struct list_head *list)
    return length;
 }
 
+static inline void list_splice(struct list_head *src, struct list_head *dst)
+{
+   if (list_empty(src))
+      return;
+
+   src->next->prev = dst;
+   src->prev->next = dst->next;
+   dst->next->prev = src->prev;
+   dst->next = src->next;
+}
+
+static inline void list_splicetail(struct list_head *src, struct list_head *dst)
+{
+   if (list_empty(src))
+      return;
+
+   src->prev->next = dst;
+   src->next->prev = dst->prev;
+   dst->prev->next = src->next;
+   dst->prev = src->prev;
+}
+
 static inline void list_validate(struct list_head *list)
 {
    struct list_head *node;