1 files changed, 40 insertions, 0 deletions
diff --git a/nuttx/libc/math/lib_round.c b/nuttx/libc/math/lib_round.c
new file mode 100644
index 000000000..6191cee5b
--- /dev/null
+++ b/nuttx/libc/math/lib_round.c
@@ -0,0 +1,40 @@
+/************************************************************************
+ * lib/math/lib_round.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *             (C) 2012 Petteri Aimonen <jpa@nx.mail.kapsi.fi>
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+#ifdef CONFIG_HAVE_DOUBLE
+double round(double x)
+{
+  double f = modf(x, &x);
+  if (x <= 0.0 && f <= -0.5)
+    {
+      x -= 1.0;
+    }
+  
+  if (x >= 0.0 && f >= 0.5)
+    {
+      x += 1.0;
+    }
+
+  return x;
+}
+#endif