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-'\" t
-.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" References consulted:
-.\"     Linux libc source code
-.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
-.\"     386BSD man pages
-.\" Modified 1993-07-24 by Rik Faith (faith@cs.unc.edu)
-.\" Modified 2002-08-10 by Walter Harms (walter.harms@informatik.uni-oldenburg.de)
-.TH copysign 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-copysign, copysignf, copysignl \- copy sign of a number
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.PP
-.BI "double copysign(double " x ", double " y );
-.BI "float copysignf(float " x ", float " y );
-.BI "long double copysignl(long double " x ", long double " y );
-.fi
-.PP
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.PP
-.BR copysign (),
-.BR copysignf (),
-.BR copysignl ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions return a value whose absolute value matches that of
-.IR x ,
-but whose sign bit matches that of
-.IR y .
-.PP
-For example,
-.I "copysign(42.0,\ \-1.0)"
-and
-.I "copysign(\-42.0, \-1.0)"
-both return \-42.0.
-.SH RETURN VALUE
-On success, these functions return a value whose magnitude is taken from
-.I x
-and whose sign is taken from
-.IR y .
-.PP
-If
-.I x
-is a NaN,
-a NaN with the sign bit of
-.I y
-is returned.
-.SH ERRORS
-No errors occur.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.ad l
-.nh
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.BR copysign (),
-.BR copysignf (),
-.BR copysignl ()
-T}	Thread safety	MT-Safe
-.TE
-.hy
-.ad
-.sp 1
-.SH VERSIONS
-On architectures where the floating-point formats are not IEEE 754 compliant,
-these functions may treat a negative zero as positive.
-.SH STANDARDS
-C11, POSIX.1-2008.
-.PP
-This function is defined in IEC 559 (and the appendix with
-recommended functions in IEEE 754/IEEE 854).
-.SH HISTORY
-C99, POSIX.1-2001, 4.3BSD.
-.SH SEE ALSO
-.BR signbit (3)