1 files changed, 28 insertions, 12 deletions
diff --git a/nuttx/lib/math/lib_fabs.c b/nuttx/lib/math/lib_fabs.c
index f479aa123..a635b0b41 100644
--- a/nuttx/lib/math/lib_fabs.c
+++ b/nuttx/lib/math/lib_fabs.c
@@ -1,4 +1,14 @@
-/*
+/************************************************************************
+ * lib/math/lib_fabs.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Ported by: Darcy Gong
+ *
+ * It derives from the Rhombs OS math library by Nick Johnson which has
+ * a compatibile, MIT-style license:
+ *
  * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com>
  * 
  * Permission to use, copy, modify, and distribute this software for any
@@ -12,19 +22,25 @@
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
+ *
+ ************************************************************************/
 
-#include <apps/math.h>
-#include <float.h>
+/************************************************************************
+ * Included Files
+ ************************************************************************/
 
-float fabsf(float x) {
-	return ((x < 0) ? -x : x);
-}
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
 
-double fabs(double x) {
-	return ((x < 0) ? -x : x);
-}
+#include <math.h>
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
 
-long double fabsl(long double x) {
-	return ((x < 0) ? -x : x);
+#if CONFIG_HAVE_DOUBLE
+double fabs(double x)
+{
+  return ((x < 0) ? -x : x);
 }
+#endif