mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
91 lines
2.6 KiB
Groff
91 lines
2.6 KiB
Groff
|
.\" $NetBSD: copysign.3,v 1.1 2011/04/13 04:57:10 jruoho 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 April 13, 2011
|
||
|
|
.Dt COPYSIGN 3
|
||
|
|
.Os
|
||
|
|
.Sh NAME
|
||
|
|
.Nm copysign ,
|
||
|
|
.Nm copysignf ,
|
||
|
|
.Nm copysignl
|
||
|
|
.Nd functions to manipulate signs
|
||
|
|
.Sh LIBRARY
|
||
|
|
.Lb libm
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.In 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"
|
||
|
|
.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.
|