diff options
Diffstat (limited to 'nuttx/lib/math/lib_ldexp.c')
-rw-r--r-- | nuttx/lib/math/lib_ldexp.c | 41 |
1 files changed, 28 insertions, 13 deletions
diff --git a/nuttx/lib/math/lib_ldexp.c b/nuttx/lib/math/lib_ldexp.c index 2ca79221a..ca428dc07 100644 --- a/nuttx/lib/math/lib_ldexp.c +++ b/nuttx/lib/math/lib_ldexp.c @@ -1,4 +1,14 @@ -/* +/************************************************************************ + * lib/math/lib_ldexp.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) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com> * * Permission to use, copy, modify, and distribute this software for any @@ -12,20 +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 ldexpf(float x, int n) { - return (x * powf(2.0, (float) n)); -} +#include <nuttx/config.h> +#include <nuttx/compiler.h> -double ldexp(double x, int n) { - return (x * pow(2.0, (double) n)); -} +#include <math.h> -long double ldexpl(long double x, int n) { - return (x * powl(2.0, (long double) n)); -} +/************************************************************************ + * Public Functions + ************************************************************************/ +#if CONFIG_HAVE_DOUBLE +double ldexp(double x, int n) +{ + return (x * pow(2.0, (double)n)); +} +#endif |