A new function to move list at the beginning of another list

This is a change of the BLI_movelisttolist but in reverse order.

1 files changed, 20 insertions, 0 deletions

diff --git a/source/blender/blenlib/intern/listbase.c b/source/blender/blenlib/intern/listbase.c
index 80b8a8d041c..da187fbd19d 100644
--- a/source/blender/blenlib/intern/listbase.c
+++ b/source/blender/blenlib/intern/listbase.c
@@ -68,6 +68,26 @@ void BLI_movelisttolist(ListBase *dst, ListBase *src)
 }
 
 /**
+ * moves the entire contents of \a src at the begining of \a dst.
+ */
+void BLI_movelisttolist_reverse(ListBase *dst, ListBase *src)
+{
+	if (src->first == NULL) return;
+
+	if (dst->first == NULL) {
+		dst->first = src->first;
+		dst->last = src->last;
+	}
+	else {
+		((Link *)src->last)->next = dst->first;
+		((Link *)dst->first)->prev = src->last;
+		dst->first = src->first;
+	}
+
+	src->first = src->last = NULL;
+}
+
+/**
  * Prepends \a vlink (assumed to begin with a Link) onto listbase.
  */
 void BLI_addhead(ListBase *listbase, void *vlink)