diff options
Diffstat (limited to 'libm')
| -rw-r--r-- | libm/double/Makefile | 2 | ||||
| -rw-r--r-- | libm/double/rint.c | 52 |
2 files changed, 53 insertions, 1 deletions
diff --git a/libm/double/Makefile b/libm/double/Makefile index a53b44d2e..9eab8ef81 100644 --- a/libm/double/Makefile +++ b/libm/double/Makefile @@ -35,7 +35,7 @@ CSRC=acosh.c airy.c asin.c asinh.c atan.c atanh.c bdtr.c beta.c \ polevl.c polmisc.c polylog.c polyn.c pow.c powi.c psi.c rgamma.c round.c \ shichi.c sici.c sin.c sindg.c sinh.c spence.c stdtr.c struve.c \ tan.c tandg.c tanh.c unity.c yn.c zeta.c zetac.c \ - sqrt.c floor.c setprec.c mtherr.c noncephes.c + sqrt.c floor.c setprec.c mtherr.c noncephes.c rint.c COBJS=$(patsubst %.c,%.o, $(CSRC)) diff --git a/libm/double/rint.c b/libm/double/rint.c new file mode 100644 index 000000000..35cf5f503 --- /dev/null +++ b/libm/double/rint.c @@ -0,0 +1,52 @@ +/* vi: set sw=4 ts=4: */ +/* + * rint for uClibc + * + * Copyright (C) 2001 by Lineo, inc. + * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU Library General Public License as published by + * the Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License + * for more details. + * + * You should have received a copy of the GNU Library General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <math.h> + +/* From the Linux man page: + * + * NAME + * rint - round to closest integer + * + * SYNOPSIS + * #include <math.h> + * double rint(double x); + * + * DESCRIPTION + * The rint() function rounds x to an integer value according + * to the prevalent rounding mode. The default rounding mode + * is to round to the nearest integer. + * + * RETURN VALUE + * The rint() function returns the integer value as a float + * ing-point number. + */ + +double rint (double x) { + double low = floor(x); + if (fmod(x,low) >= (double)0.5) + return(ceil(x)); + else + return(low); +} + |