add function for rotating linked list so at item is last.

2 files changed, 23 insertions, 7 deletions

diff --git a/source/blender/blenlib/BLI_listbase.h b/source/blender/blenlib/BLI_listbase.h
index 0648c0ed06d..0927620a2c6 100644
--- a/source/blender/blenlib/BLI_listbase.h
+++ b/source/blender/blenlib/BLI_listbase.h
@@ -74,7 +74,8 @@ void BLI_freelinkN(struct ListBase *listbase, void *vlink);
 void BLI_movelisttolist(struct ListBase *dst, struct ListBase *src);
 void BLI_duplicatelist(struct ListBase *dst, const struct ListBase *src);
 void BLI_reverselist(struct ListBase *lb);
-void BLI_rotatelist(struct ListBase *lb, void *vlink);
+void BLI_rotatelist_first(struct ListBase *lb, void *vlink);
+void BLI_rotatelist_last(struct ListBase *lb, void *vlink);
 
 /* create a generic list node containing link to provided data */
 struct LinkData *BLI_genericNodeN(void *data);
diff --git a/source/blender/blenlib/intern/listbase.c b/source/blender/blenlib/intern/listbase.c
index c4644ff6309..2c59b940f8c 100644
--- a/source/blender/blenlib/intern/listbase.c
+++ b/source/blender/blenlib/intern/listbase.c
@@ -581,19 +581,34 @@ void BLI_reverselist(ListBase *lb)
 /**
  * \param vlink Link to make first.
  */
-void BLI_rotatelist(ListBase *lb, void *vlink)
+void BLI_rotatelist_first(ListBase *lb, void *vlink)
 {
 	/* make circular */
-	((LinkData *)lb->first)->prev = lb->last;
-	((LinkData *)lb->last)->next = lb->first;
+	((Link *)lb->first)->prev = lb->last;
+	((Link *)lb->last)->next = lb->first;
 
 	lb->first = vlink;
-	lb->last = ((LinkData *)vlink)->prev;
+	lb->last = ((Link *)vlink)->prev;
 
-	((LinkData *)lb->first)->prev = NULL;
-	((LinkData *)lb->last)->next = NULL;
+	((Link *)lb->first)->prev = NULL;
+	((Link *)lb->last)->next = NULL;
 }
 
+/**
+ * \param vlink Link to make last.
+ */
+void BLI_rotatelist_last(ListBase *lb, void *vlink)
+{
+	/* make circular */
+	((Link *)lb->first)->prev = lb->last;
+	((Link *)lb->last)->next = lb->first;
+
+	lb->first = ((Link *)vlink)->next;
+	lb->last = vlink;
+
+	((Link *)lb->first)->prev = NULL;
+	((Link *)lb->last)->next = NULL;
+}
 
 /* create a generic list node containing link to provided data */
 LinkData *BLI_genericNodeN(void *data)