uORB: Major refactoring

uORB was refactored in order to support the MuORB changes required
for QURT. Those changes wil be added in a subsequent commit.

The files are split out by posix and nuttx so the changes are visible.
When this has been tested, the files can be re-merged and re-tested.

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

src/modules/uORB/uORBUtils.cpp

@@ -0,0 +1,63 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2012-2015 PX4 Development Team. All rights reserved.
+ *
+ * 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.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+#include "uORBUtils.hpp"
+#include <stdio.h>
+#include <errno.h>
+
+int uORB::Utils::node_mkpath
+(
+        char *buf,
+        Flavor f,
+        const struct orb_metadata *meta,
+        int *instance
+)
+{
+  unsigned len;
+
+  unsigned index = 0;
+
+  if (instance != nullptr) {
+    index = *instance;
+  }
+
+  len = snprintf(buf, orb_maxpath, "/%s/%s%d",
+      (f == PUBSUB) ? "obj" : "param",
+      meta->o_name, index);
+
+  if (len >= orb_maxpath) {
+    return -ENAMETOOLONG;
+  }
+
+  return OK;
+}