1 files changed, 38 insertions, 0 deletions
diff --git a/nuttx/libc/math/lib_roundf.c b/nuttx/libc/math/lib_roundf.c
new file mode 100644
index 000000000..145cf3df6
--- /dev/null
+++ b/nuttx/libc/math/lib_roundf.c
@@ -0,0 +1,38 @@
+/************************************************************************
+ * lib/math/lib_roundf.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
+ ************************************************************************/
+
+float roundf(float x)
+{
+  float f = modff(x, &x);
+  if (x <= 0.0f && f <= -0.5f)
+    {
+      x -= 1.0f;
+    }
+  
+  if (x >= 0.0f && f >= 0.5f)
+    {
+      x += 1.0f;
+    }
+
+  return x;
+}