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Annotation of src/lib/libc/gen/isfinite.3, Revision 1.4

1.4     ! jruoho      1: .\"    $NetBSD: isfinite.3,v 1.3 2008/04/30 13:10:50 martin Exp $
1.1       kleink      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
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                     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
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                     18: .\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     19: .\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     20: .\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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1.4     ! jruoho     30: .Dd August 6, 2011
1.1       kleink     31: .Dt ISFINITE 3
                     32: .Os
                     33: .Sh NAME
                     34: .Nm isfinite
                     35: .Nd test for finite value
                     36: .Sh LIBRARY
                     37: .Lb libc
                     38: .Sh SYNOPSIS
                     39: .In math.h
                     40: .Ft int
                     41: .Fn isfinite "real-floating x"
                     42: .Sh DESCRIPTION
                     43: The
                     44: .Fn isfinite
                     45: determines whether its argument
                     46: .Fa x
                     47: has a finite value.
1.2       kleink     48: An argument represented in a format wider than its semantic type is
1.1       kleink     49: converted to its semantic type first.
                     50: The determination is then based on the type of the argument.
                     51: .Ss IEEE 754
                     52: It is determined whether the value of
                     53: .Fa x
1.2       kleink     54: is zero, subnormal, or normal, and neither infinite nor NaN.
1.1       kleink     55: .Ss VAX
                     56: It is determined whether the value of
                     57: .Fa x
1.2       kleink     58: is true zero or finite, and neither dirty zero nor ROP.
1.1       kleink     59: .Sh RETURN VALUES
                     60: The
                     61: .Fn isfinite
                     62: macro returns a non-zero value if the value of
                     63: .Fa x
                     64: is finite.
                     65: Otherwise 0 is returned.
                     66: .Sh ERRORS
                     67: No errors are defined.
                     68: .Sh SEE ALSO
1.4     ! jruoho     69: .Xr finite 3 ,
1.1       kleink     70: .Xr fpclassify 3 ,
1.2       kleink     71: .Xr isnormal 3 ,
                     72: .Xr math 3 ,
                     73: .Xr signbit 3
1.1       kleink     74: .Sh STANDARDS
                     75: The
1.2       kleink     76: .Fn isfinite
1.1       kleink     77: macro conforms to
                     78: .St -isoC-99 .

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