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Annotation of src/lib/libc/gen/signbit.3, Revision 1.2

1.2     ! wiz         1: .\"    $NetBSD: signbit.3,v 1.1 2004/01/15 19:43:45 kleink 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
                     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
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                     17: .\" 3. All advertising materials mentioning features or use of this software
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                     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
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                     37: .Dd October 29, 2003
                     38: .Dt SIGNBIT 3
                     39: .Os
                     40: .Sh NAME
                     41: .Nm signbit
                     42: .Nd test sign
                     43: .Sh LIBRARY
                     44: .Lb libc
                     45: .Sh SYNOPSIS
                     46: .In math.h
                     47: .Ft int
                     48: .Fn signbit "real-floating x"
                     49: .Sh DESCRIPTION
                     50: The
                     51: .Fn signbit
                     52: macro determines whether the sign of its argument value
                     53: .Fa x
                     54: is negative.
                     55: An argument represented in a format wider than its semantic type is
                     56: converted to its semantic type first.
                     57: The determination is then based on the type of the argument.
                     58: .Ss IEEE754
1.2     ! wiz        59: The sign is determined for all values, including infinities, zeroes,
1.1       kleink     60: and NaNs
                     61: .Ss VAX
                     62: The sign is determined for finites, true zeros, and dirty zeroes;
                     63: for ROPs the sign is reported negative.
                     64: .Sh RETURN VALUES
                     65: The
                     66: .Fn signbit
                     67: macro returns a non-zero value if the sign of its value
                     68: .Fa x
                     69: is negative.
                     70: Otherwise 0 is returned.
                     71: .Sh ERRORS
                     72: No errors are defined.
                     73: .Sh SEE ALSO
                     74: .Xr fpclassify 3 ,
                     75: .Xr isfinite 3 ,
                     76: .Xr isnormal 3 ,
                     77: .Xr math 3
                     78: .Sh STANDARDS
                     79: The
                     80: .Fn signbit
                     81: macro conforms to
                     82: .St -isoC-99 .

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