Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / isnormal.3
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1.\" $NetBSD: isnormal.3,v 1.2 2004/01/15 20:30:46 wiz Exp $
2.\" $DragonFly: src/lib/libc/gen/isnormal.3,v 1.1 2006/04/08 14:12:36 swildner Exp $
3.\"
4.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
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7.\" This code is derived from software contributed to The NetBSD Foundation
8.\" by Klaus Klein.
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38.Dd October 29, 2003
39.Dt ISNORMAL 3
40.Os
41.Sh NAME
42.Nm isnormal
43.Nd test for normal value
44.Sh LIBRARY
45.Lb libc
46.Sh SYNOPSIS
47.In math.h
48.Ft int
49.Fn isnormal "real-floating x"
50.Sh DESCRIPTION
51The
52.Fn isnormal
53macro determines whether its argument
54.Fa x
55has a normal value.
56An argument represented in a format wider than its semantic type is
57converted to its semantic type first.
58The determination is then based on the type of the argument.
59.Sh RETURN VALUES
60The
61.Fn isnormal
62macro returns a non-zero value if the value of
63.Fa x
64is finite.
65Otherwise 0 is returned.
66.Sh ERRORS
67No errors are defined.
68.Sh SEE ALSO
69.Xr fpclassify 3 ,
70.Xr isfinite 3 ,
71.Xr math 3 ,
72.Xr signbit 3
73.Sh STANDARDS
74The
75.Fn isnormal
76macro conforms to
77.St -isoC-99 .