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+.\"	$NetBSD: isinff.3,v 1.6 2010/05/14 03:10:24 joerg 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.
+.\"
+.\"     from: @(#)isinf.3	8.2 (Berkeley) 1/29/94
+.\"	from: NetBSD: isinf.3,v 1.5 1998/08/02 04:52:54 mycroft Exp
+.\"
+.Dd August 16, 1999
+.Dt ISINFF 3
+.Os
+.Sh NAME
+.Nm isinff ,
+.Nm isnanf
+.Nd test for infinity or not-a-number
+.Sh LIBRARY
+.Lb libm
+.Sh SYNOPSIS
+.In math.h
+.Ft int
+.Fn isinff float
+.Ft int
+.Fn isnanf float
+.Sh DESCRIPTION
+The
+.Fn isinff
+function
+returns 1 if the number is
+.Dq \*(If ,
+otherwise 0.
+.Pp
+The
+.Fn isnanf
+function
+returns 1 if the number is
+.Dq not-a-number ,
+otherwise 0.
+.Sh SEE ALSO
+.Xr isinf 3 ,
+.Xr isnan 3 ,
+.Xr math 3
+.Rs
+.%T "IEEE Standard for Binary Floating-Point Arithmetic"
+.%Q ANSI
+.%R Std 754-1985
+.Re
+.Sh BUGS
+Neither the
+.Tn VAX
+nor the Tahoe floating point have distinguished values
+for either infinity or not-a-number.
+These routines always return 0 on those architectures.