minix/lib/libm/gen/nan.3

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.\" $NetBSD: nan.3,v 1.4 2011/06/10 14:10:18 njoly Exp $
.\"
.\" Copyright (c) 2006 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Klaus Klein.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\"
.Dd March 15, 2006
.Dt NAN 3
.Os
.Sh NAME
.Nm nan ,
.Nm nanf ,
.Nm nanl
.Nd return quiet NaN
.Sh LIBRARY
.Lb libm
.Sh SYNOPSIS
.In math.h
.Ft double
.Fn nan "const char *tagp"
.Ft float
.Fn nanf "const char *tagp"
.Ft long double
.Fn nanl "const char *tagp"
.Sh DESCRIPTION
The call
.Fn nan "\*qn-char-sequence\*q"
is equivalent to the call
.Fn strod "\*qNAN(n-char-sequence)\*q" "NULL" .
The call
.Fn nan "\*q\*q"
is equivalent to the call
.Fn strod "\*qNAN()\*q" "NULL" .
.Pp
The
.Fn nanf
and
.Fn nanl
functions are equivalent to
.Fn nan
but substituting
.Fn strtof
and
.Fn strtold ,
respectively.
.Sh RETURN VALUES
.Ss IEEE 754
The
.Fn nan ,
.Fn nanf ,
and
.Fn nanl
functions return a quiet NaN as specified by
.Fa tagp .
.Ss VAX
The
.Fn nan ,
.Fn nanf ,
and
.Fn nanl
functions return zero.
.Sh SEE ALSO
.Xr math 3 ,
.Xr strtod 3
.Sh STANDARDS
The
.Fn nan ,
.Fn nanf ,
and
.Fn nanl
functions conform to
.St -isoC-99 .