$NetBSD: copysign.3,v 1.4 2017/09/28 15:03:18 maya Exp $
Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
.Dd September 28, 2017 .Dt COPYSIGN 3 .Os .Sh NAME .Nm copysign , .Nm copysignf , .Nm copysignl .Nd functions to manipulate signs .Sh LIBRARY .Lb libm .Sh SYNOPSIS n math.h .Ft double .Fn copysign "double x" "double y" .Ft float .Fn copysignf "float x" "float y" .Ft long double .Fn copysignl "long double x" "long double y" n tgmath.h .Ft real-floating .Fn copysign "real-floating x" "real-floating y" .Sh DESCRIPTION The .Fn copysign , .Fn copysignf , and .Fn copysignl functions return a value whose absolute value matches .Fa x , but whose sign bit is taken from .Fa y . .Sh RETURN VALUES Upon successful completion, all three functions return a value with the magnitude of .Fa x and the sign of .Fa y . If .Fa x is \*(Na , the functions return a \*(Na with the sign of .Fa y . .Sh SEE ALSO .Xr math 3 , .Xr signbit 3 .Sh STANDARDS The described functions conform to .St -isoC-99 .
XXX: Verify this.
The functions are also recommended by
.St -ieee754
.Sh HISTORY
XXX: Fill this.
These functions first appeared in ???.
.Sh CAVEATS Note that on implementations that represent a signed zero but do not treat negative zero consistently in arithmetic operations, these functions may regard the sign of zero as positive.
Copyright (c) 2011 Jukka Ruohonen <jruohonen@iki.fi>
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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
.Dd September 28, 2017 .Dt COPYSIGN 3 .Os .Sh NAME .Nm copysign , .Nm copysignf , .Nm copysignl .Nd functions to manipulate signs .Sh LIBRARY .Lb libm .Sh SYNOPSIS n math.h .Ft double .Fn copysign "double x" "double y" .Ft float .Fn copysignf "float x" "float y" .Ft long double .Fn copysignl "long double x" "long double y" n tgmath.h .Ft real-floating .Fn copysign "real-floating x" "real-floating y" .Sh DESCRIPTION The .Fn copysign , .Fn copysignf , and .Fn copysignl functions return a value whose absolute value matches .Fa x , but whose sign bit is taken from .Fa y . .Sh RETURN VALUES Upon successful completion, all three functions return a value with the magnitude of .Fa x and the sign of .Fa y . If .Fa x is \*(Na , the functions return a \*(Na with the sign of .Fa y . .Sh SEE ALSO .Xr math 3 , .Xr signbit 3 .Sh STANDARDS The described functions conform to .St -isoC-99 .
XXX: Verify this.
The functions are also recommended by
.St -ieee754
.Sh HISTORY
XXX: Fill this.
These functions first appeared in ???.
.Sh CAVEATS Note that on implementations that represent a signed zero but do not treat negative zero consistently in arithmetic operations, these functions may regard the sign of zero as positive.