This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
84 lines
2.6 KiB
Groff
84 lines
2.6 KiB
Groff
.\" $NetBSD: isinf.3,v 1.12 2004/03/04 23:47:56 wiz Exp $
|
|
.\"
|
|
.\" Copyright (c) 1991, 1993
|
|
.\" The Regents of the University of California. 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.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" 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.
|
|
.\"
|
|
.\" @(#)isinf.3 8.2 (Berkeley) 1/29/94
|
|
.\"
|
|
.Dd March 5, 2004
|
|
.Dt ISINF 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm isinf
|
|
.Nd test for infinity
|
|
.Sh LIBRARY
|
|
.Lb libc
|
|
.Sh SYNOPSIS
|
|
.In math.h
|
|
.Ft int
|
|
.Fn isinf "real-floating x"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn isinf
|
|
macro determines whether its argument
|
|
.Fa x
|
|
is an infinity (positive or 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 IEEE 754
|
|
It is determined whether the value of
|
|
.Fa x
|
|
is an infinity.
|
|
.Ss VAX
|
|
Infinities are not supported.
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Fn isinf
|
|
macro returns a non-zero value if the value of
|
|
.Fa x
|
|
is an infinity.
|
|
Otherwise 0 is returned.
|
|
.Sh SEE ALSO
|
|
.Xr fpclassify 3 ,
|
|
.Xr isfinite 3 ,
|
|
.Xr isinff 3 ,
|
|
.Xr isnan 3 ,
|
|
.Xr isnanf 3 ,
|
|
.Xr isnormal 3 ,
|
|
.Xr math 3 ,
|
|
.Xr signbit 3
|
|
.Rs
|
|
.%T "IEEE Standard for Binary Floating-Point Arithmetic"
|
|
.%Q ANSI
|
|
.%R Std 754-1985
|
|
.Re
|
|
.Sh STANDARDS
|
|
The
|
|
.Fn isinf
|
|
macro conforms to
|
|
.St -isoC-99 .
|