1.\" $NetBSD: fpclassify.3,v 1.2 2004/01/15 19:43:45 kleink Exp $ 2.\" 3.\" Copyright (c) 2003 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Klaus Klein. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the NetBSD 20.\" Foundation, Inc. and its contributors. 21.\" 4. Neither the name of The NetBSD Foundation nor the names of its 22.\" contributors may be used to endorse or promote products derived 23.\" from this software without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" 37.Dd January 14, 2004 38.Dt FPCLASSIFY 3 39.Os 40.Sh NAME 41.Nm fpclassify 42.Nd classify real floating type 43.Sh LIBRARY 44.Lb libc 45.Sh SYNOPSIS 46.In math.h 47.Ft int 48.Fn fpclassify "real-floating x" 49.Sh DESCRIPTION 50The 51.Fn fpclassify 52macro performs classification of its argument 53.Fa x . 54An argument represented in a format wider than its semantic type is 55converted to its semantic type first. 56The classification is then based on the type of the argument. 57.Ss IEEE 754 58.Bl -tag -width "FP_SUBNORMALXXX" -compact -offset indent 59.It Dv FP_INFINITE 60infinity, either positive or negative 61.It Dv FP_NAN 62not-a-number 63.Pq Dq NaN 64.It Dv FP_NORMAL 65normal 66.It Dv FP_SUBNORMAL 67subnormal 68.It Dv FP_ZERO 69zero 70.El 71.Ss VAX 72.Bl -tag -width "FP_DIRTYZEROXXX" -compact -offset indent 73.It Dv FP_ROP 74reserved operand 75.Pq Dq ROP 76.It Dv FP_DIRTYZERO 77dirty zero 78.It Dv FP_NORMAL 79finite 80.It Dv FP_ZERO 81true zero 82.El 83.Sh RETURN VALUES 84The 85.Fn fpclassify 86macro returns the value of the number classification macro appropriate 87to its argument 88.Fa x 89as described above. 90.Sh ERRORS 91No errors are defined. 92.Sh SEE ALSO 93.Xr isfinite 3 , 94.Xr isnormal 3 , 95.Xr math 3 , 96.Xr signbit 3 97.Sh STANDARDS 98The 99.Fn fpclassify 100macro conforms to 101.St -isoC-99 . 102