diff options
Diffstat (limited to 'nuttx/libc/math/lib_round.c')
-rw-r--r-- | nuttx/libc/math/lib_round.c | 40 |
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 |