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Add round(3) and roundf(3) and the associated documentation.

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PR:		59797
Submitted by:	"Steven G. Kargl" <kargl@troutmask.apl.washington.edu>
Reviewed by:	bde (earlier version, last year)
This commit is contained in:
das 2004-06-07 08:05:36 +00:00
parent 9e42f707a1
commit e2928bd733
5 changed files with 183 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
lib/msun/Makefile
View File

@ -85,7 +85,8 @@ COMMON_SRCS= b_exp.c b_log.c b_tgamma.c \
s_floor.c s_floorf.c s_frexp.c s_frexpf.c s_ilogb.c s_ilogbf.c \
s_isnanf.c s_ldexpf.c s_lib_version.c s_log1p.c \
s_log1pf.c s_logb.c s_logbf.c s_matherr.c s_modff.c \
s_nextafter.c s_nextafterf.c s_rint.c s_rintf.c s_scalbn.c s_scalbnf.c \
s_nextafter.c s_nextafterf.c s_rint.c s_rintf.c s_round.c s_roundf.c \
s_scalbn.c s_scalbnf.c \
s_signgam.c s_significand.c s_significandf.c s_sin.c s_sinf.c s_tan.c \
s_tanf.c s_tanh.c s_tanhf.c \
w_acos.c w_acosf.c w_acosh.c w_acoshf.c w_asin.c w_asinf.c w_atan2.c \
@ -127,7 +128,7 @@ INCS= fenv.h math.h
MAN= acos.3 acosh.3 asin.3 asinh.3 atan.3 atan2.3 atanh.3 ceil.3 \
cos.3 cosh.3 erf.3 exp.3 fabs.3 feclearexcept.3 fegetenv.3 \
fegetround.3 fenv.3 floor.3 fmod.3 hypot.3 ieee.3 \
ieee_test.3 j0.3 lgamma.3 math.3 rint.3 sin.3 sinh.3 sqrt.3 \
ieee_test.3 j0.3 lgamma.3 math.3 rint.3 round.3 sin.3 sinh.3 sqrt.3 \
tan.3 tanh.3
MLINKS+=acos.3 acosf.3
@ -165,6 +166,7 @@ MLINKS+=j0.3 j1.3 j0.3 jn.3 j0.3 y0.3 j0.3 y1.3 j0.3 y1f.3 j0.3 yn.3
MLINKS+=j0.3 j0f.3 j0.3 j1f.3 j0.3 jnf.3 j0.3 y0f.3 j0.3 ynf.3
MLINKS+=lgamma.3 gamma.3 lgamma.3 gammaf.3 lgamma.3 lgammaf.3 lgamma.3 tgamma.3
MLINKS+=rint.3 rintf.3
MLINKS+=round.3 roundf.3
MLINKS+=sin.3 sinf.3
MLINKS+=sinh.3 sinhf.3
MLINKS+=sqrt.3 cbrt.3 sqrt.3 cbrtf.3 sqrt.3 sqrtf.3

71
lib/msun/man/round.3 Normal file
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@ -0,0 +1,71 @@
.\" Copyright (c) 2003, Steven G. Kargl
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd November 29, 2003
.Dt ROUND 3
.Os
.Sh NAME
.Nm round ,
.Nm roundf
.Nd round to nearest integral value
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft double
.Fn round "double x"
.Ft float
.Fn roundf "float x"
.Sh DESCRIPTION
The
.Fn round
and
.Fn roundf
functions return the nearest integral value to
.Fa x ;
if
.Fa x
lies halfway between two integral values, then these
functions return the integral value with the larger
absolute value (i.e., they round away from zero).
.Sh SEE ALSO
.Xr ceil 3 ,
.Xr floor 3 ,
.Xr ieee 3 ,
.Xr math 3 ,
.Xr rint 3
.Sh STANDARDS
The
.Fn round
function conforms to
.St -isoC-99 .
.Sh HISTORY
The
.Fn round
and
.Fn roundf
functions appeared in
.Fx 5.3 .

2
lib/msun/src/math.h
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@ -215,6 +215,7 @@ double logb(double) __pure2;
double nextafter(double, double);
double remainder(double, double);
double rint(double) __pure2;
double round(double);
#endif /* __BSD_VISIBLE || __ISO_C_VISIBLE >= 1999 || __XSI_VISIBLE */
#if __BSD_VISIBLE || __XSI_VISIBLE
@ -292,6 +293,7 @@ float ceilf(float);
float fabsf(float);
float floorf(float);
float fmodf(float, float);
float roundf(float);
float erff(float);
float erfcf(float) __pure2;

53
lib/msun/src/s_round.c Normal file
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@ -0,0 +1,53 @@
/*-
* Copyright (c) 2003, Steven G. Kargl
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <math.h>
double
round(double x)
{
double t;
int i;
i = fpclassify(x);
if (i == FP_INFINITE || i == FP_NAN)
return (x);
if (x >= 0.0) {
t = ceil(x);
if (t - x > 0.5)
t -= 1.0;
return (t);
} else {
t = ceil(-x);
if (t + x > 0.5)
t -= 1.0;
return (-t);
}
}

53
lib/msun/src/s_roundf.c Normal file
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@ -0,0 +1,53 @@
/*-
* Copyright (c) 2003, Steven G. Kargl
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <math.h>
float
roundf(float x)
{
float t;
int i;
i = fpclassify(x);
if (i == FP_INFINITE || i == FP_NAN)
return (x);
if (x >= 0.0) {
t = ceilf(x);
if (t - x > 0.5)
t -= 1.0;
return (t);
} else {
t = ceilf(-x);
if (t + x > 0.5)
t -= 1.0;
return (-t);
}
}