score: Split up rbtreenext.c

Split up rbtreenext.c since only _RBTree_Minimum() is used by the operating
system core services (thread queues and the EDF scheduler).

Change license to BSD-2-Clause according to file history and re-licensing
agreement.

Update #3053.

1 files changed, 55 insertions, 0 deletions

diff --git a/cpukit/score/src/rbtreemin.c b/cpukit/score/src/rbtreemin.c
new file mode 100644
index 0000000000..b3cd4331c1
--- /dev/null
+++ b/cpukit/score/src/rbtreemin.c
@@ -0,0 +1,55 @@
+/**
+ * @file
+ *
+ * @ingroup RTEMSScoreRBTree
+ *
+ * @brief This source file contains the implementation of
+ *   _RBTree_Minimum().
+ */
+
+/*
+ * Copyright (C) 2021 embedded brains GmbH (http://www.embedded-brains.de)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/score/rbtreeimpl.h>
+
+RBTree_Node *_RBTree_Minimum( const RBTree_Control *tree )
+{
+  RBTree_Node *parent;
+  RBTree_Node *node;
+
+  parent = NULL;
+  node = _RBTree_Root( tree );
+
+  while ( node != NULL ) {
+    parent = node;
+    node = _RBTree_Left( node );
+  }
+
+  return parent;
+}