cpukit: Add libdl with the Runtime Loader (RTL) code.

This is a merge of the RTL project.

cpukit/libdl/rtl-chain-iterator.c

@@ -0,0 +1,57 @@
+/*
+ *  COPYRIGHT (c) 2012 Chris Johns <chrisj@rtems.org>
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ */
+/**
+ * @file
+ *
+ * @ingroup rtems_rtld
+ *
+ * @brief RTEMS Run-Time Link Editor Chain Iterator
+ *
+ * A means of executing an iterator on a chain.
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "rtl-chain-iterator.h"
+
+bool
+rtems_rtl_chain_iterate (rtems_chain_control* chain,
+                         rtems_chain_iterator iterator,
+                         void*                data)
+{
+  rtems_chain_node* node = rtems_chain_first (chain);
+  while (!rtems_chain_is_tail (chain, node))
+  {
+    rtems_chain_node* next_node = rtems_chain_next (node);
+    if (!iterator (node, data))
+      return false;
+    node = next_node;
+  }
+  return true;
+}
+
+/**
+ * Count iterator.
+ */
+static bool
+rtems_rtl_count_iterator (rtems_chain_node* node, void* data)
+{
+  int* count = data;
+  ++(*count);
+  return true;
+}
+
+int
+rtems_rtl_chain_count (rtems_chain_control* chain)
+{
+  int count = 0;
+  rtems_rtl_chain_iterate (chain, rtems_rtl_count_iterator, &count);
+  return count;
+}