1.\" $NetBSD: isnormal.3,v 1.2 2004/01/15 20:30:46 wiz 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 October 29, 2003 38.Dt ISNORMAL 3 39.Os 40.Sh NAME 41.Nm isnormal 42.Nd test for normal value 43.Sh LIBRARY 44.Lb libc 45.Sh SYNOPSIS 46.In math.h 47.Ft int 48.Fn isnormal "real-floating x" 49.Sh DESCRIPTION 50The 51.Fn isnormal 52macro determines whether its argument 53.Fa x 54has a normal value. 55An argument represented in a format wider than its semantic type is 56converted to its semantic type first. 57The determination is then based on the type of the argument. 58.Ss IEEE 754 59It is determined whether the value of 60.Fa x 61is normal, and neither zero, subnormal, infinite nor NaN. 62.Ss VAX 63It is determined whether the value of 64.Fa x 65is finite, and neither true zero, dirty zero nor ROP. 66.Sh RETURN VALUES 67The 68.Fn isnormal 69macro returns a non-zero value if the value of 70.Fa x 71is finite. 72Otherwise 0 is returned. 73.Sh ERRORS 74No errors are defined. 75.Sh SEE ALSO 76.Xr fpclassify 3 , 77.Xr isfinite 3 , 78.Xr math 3 , 79.Xr signbit 3 80.Sh STANDARDS 81The 82.Fn isnormal 83macro conforms to 84.St -isoC-99 . 85