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.\" $NetBSD: fpclassify.3,v 1.2 2004/01/15 19:43:45 kleink Exp $
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.\"
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.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Klaus Klein.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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2004-01-15 22:43:44 +03:00
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.Dd January 14, 2004
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.Dt FPCLASSIFY 3
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.Os
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.Sh NAME
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.Nm fpclassify
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.Nd classify real floating type
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In math.h
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.Ft int
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.Fn fpclassify "real-floating x"
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.Sh DESCRIPTION
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The
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.Fn fpclassify
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macro performs classification of its argument
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.Fa x .
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An argument represented in a format wider than its semantic type is
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converted to its semantic type first.
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The classification is then based on the type of the argument.
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.Ss IEEE 754
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.Bl -tag -width "FP_SUBNORMALXXX" -compact -offset indent
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.It Dv FP_INFINITE
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infinity, either positive or negative
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.It Dv FP_NAN
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not-a-number
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.Pq Dq NaN
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.It Dv FP_NORMAL
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normal
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.It Dv FP_SUBNORMAL
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subnormal
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.It Dv FP_ZERO
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zero
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.El
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.Ss VAX
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.Bl -tag -width "FP_DIRTYZEROXXX" -compact -offset indent
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.It Dv FP_ROP
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reserved operand
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.Pq Dq ROP
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.It Dv FP_DIRTYZERO
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dirty zero
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.It Dv FP_NORMAL
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finite
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.It Dv FP_ZERO
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true zero
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.El
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.Sh RETURN VALUES
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The
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.Fn fpclassify
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macro returns the value of the number classification macro appropriate
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to its argument
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.Fa x
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as described above.
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.Sh ERRORS
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No errors are defined.
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.Sh SEE ALSO
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.Xr isfinite 3 ,
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.Xr isnormal 3 ,
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.Xr math 3 ,
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.Xr signbit 3
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.Sh STANDARDS
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The
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.Fn fpclassify
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macro conforms to
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.St -isoC-99 .
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