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+.\"	$NetBSD: fpclassify.3,v 1.3 2008/04/30 13:10:50 martin 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 January 14, 2004
+.Dt FPCLASSIFY 3
+.Os
+.Sh NAME
+.Nm fpclassify
+.Nd classify real floating type
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In math.h
+.Ft int
+.Fn fpclassify "real-floating x"
+.Sh DESCRIPTION
+The
+.Fn fpclassify
+macro performs classification of its argument
+.Fa x .
+An argument represented in a format wider than its semantic type is
+converted to its semantic type first.
+The classification is then based on the type of the argument.
+.Ss IEEE 754
+.Bl -tag -width "FP_SUBNORMALXXX" -compact -offset indent
+.It Dv FP_INFINITE
+infinity, either positive or negative
+.It Dv FP_NAN
+not-a-number
+.Pq Dq NaN
+.It Dv FP_NORMAL
+normal
+.It Dv FP_SUBNORMAL
+subnormal
+.It Dv FP_ZERO
+zero
+.El
+.Ss VAX
+.Bl -tag -width "FP_DIRTYZEROXXX" -compact -offset indent
+.It Dv FP_ROP
+reserved operand
+.Pq Dq ROP
+.It Dv FP_DIRTYZERO
+dirty zero
+.It Dv FP_NORMAL
+finite
+.It Dv FP_ZERO
+true zero
+.El
+.Sh RETURN VALUES
+The
+.Fn fpclassify
+macro returns the value of the number classification macro appropriate
+to its argument
+.Fa x
+as described above.
+.Sh ERRORS
+No errors are defined.
+.Sh SEE ALSO
+.Xr isfinite 3 ,
+.Xr isnormal 3 ,
+.Xr math 3 ,
+.Xr signbit 3
+.Sh STANDARDS
+The
+.Fn fpclassify
+macro conforms to
+.St -isoC-99 .