$NetBSD: signbit.3,v 1.2 2004/01/15 20:31:40 wiz Exp $
Copyright (c) 2003 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Klaus Klein.
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 October 29, 2003 .Dt SIGNBIT 3 .Os .Sh NAME .Nm signbit .Nd test sign .Sh LIBRARY .Lb libc .Sh SYNOPSIS n math.h .Ft int .Fn signbit "real-floating x" .Sh DESCRIPTION The .Fn signbit macro determines whether the sign of its argument value .Fa x is negative. An argument represented in a format wider than its semantic type is converted to its semantic type first. The determination is then based on the type of the argument. .Ss IEEE754 The sign is determined for all values, including infinities, zeroes, and NaNs .Ss VAX The sign is determined for finites, true zeros, and dirty zeroes; for ROPs the sign is reported negative. .Sh RETURN VALUES The .Fn signbit macro returns a non-zero value if the sign of its value .Fa x is negative. Otherwise 0 is returned. .Sh ERRORS No errors are defined. .Sh SEE ALSO .Xr fpclassify 3 , .Xr isfinite 3 , .Xr isnormal 3 , .Xr math 3 .Sh STANDARDS The .Fn signbit macro conforms to .St -isoC-99 .
Copyright (c) 2003 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Klaus Klein.
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 October 29, 2003 .Dt SIGNBIT 3 .Os .Sh NAME .Nm signbit .Nd test sign .Sh LIBRARY .Lb libc .Sh SYNOPSIS n math.h .Ft int .Fn signbit "real-floating x" .Sh DESCRIPTION The .Fn signbit macro determines whether the sign of its argument value .Fa x is negative. An argument represented in a format wider than its semantic type is converted to its semantic type first. The determination is then based on the type of the argument. .Ss IEEE754 The sign is determined for all values, including infinities, zeroes, and NaNs .Ss VAX The sign is determined for finites, true zeros, and dirty zeroes; for ROPs the sign is reported negative. .Sh RETURN VALUES The .Fn signbit macro returns a non-zero value if the sign of its value .Fa x is negative. Otherwise 0 is returned. .Sh ERRORS No errors are defined. .Sh SEE ALSO .Xr fpclassify 3 , .Xr isfinite 3 , .Xr isnormal 3 , .Xr math 3 .Sh STANDARDS The .Fn signbit macro conforms to .St -isoC-99 .