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Diffstat (limited to 'lib/msun/man/ilogb.3')
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diff --git a/lib/msun/man/ilogb.3 b/lib/msun/man/ilogb.3 new file mode 100644 index 0000000..090ae56 --- /dev/null +++ b/lib/msun/man/ilogb.3 @@ -0,0 +1,124 @@ +.\" Copyright (c) 1985, 1991 Regents of the University of California. +.\" All rights reserved. +.\" +.\" 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. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" from: @(#)ieee.3 6.4 (Berkeley) 5/6/91 +.\" $FreeBSD$ +.\" +.Dd December 16, 2007 +.Dt ILOGB 3 +.Os +.Sh NAME +.Nm ilogb , +.Nm ilogbf , +.Nm ilogbl , +.Nm logb , +.Nm logbf , +.Nm logbl +.Nd extract exponent +.Sh LIBRARY +.Lb libm +.Sh SYNOPSIS +.In math.h +.Ft int +.Fn ilogb "double x" +.Ft int +.Fn ilogbf "float x" +.Ft int +.Fn ilogbl "long double x" +.Ft double +.Fn logb "double x" +.Ft float +.Fn logbf "float x" +.Ft long double +.Fn logbl "long double x" +.Sh DESCRIPTION +.Fn ilogb , +.Fn ilogbf +and +.Fn ilogbl +return +.Fa x Ns 's exponent +in integer format. +.Fn ilogb \*(Pm\*(If +returns +.Dv INT_MAX , +.Fn ilogb \*(Pm\*(Na +returns +.Dv FP_ILOGBNAN , +and +.Fn ilogb 0 +returns +.Dv FP_ILOGB0 . +.Pp +.Fn logb x , +.Fn logbf x , +and +.Fn logbl x +return +.Fa x Ns 's exponent +in floating\-point format with the same precision as +.Fa x . +.Fn logb \*(Pm\*(If +returns +\*(If, and +.Fn logb 0 +returns -\*(If with a division by zero exception. +.Sh SEE ALSO +.Xr frexp 3 , +.Xr ieee 3 , +.Xr math 3 , +.Xr scalbn 3 +.Sh STANDARDS +The +.Fn ilogb , +.Fn ilogbf , +.Fn ilogbl , +.Fn logb , +.Fn logbf , +and +.Fn logbl +routines conform to +.St -isoC-99 . +The latter three +implement the logb function recommended by +.St -ieee754 . +.Sh HISTORY +.Bl -tag -width "Function " -compact +.It Em Function +.Em "First Appeared In" +.It Fn logb +.Bx 4.3 +.It Fn ilogb +.Fx 1.1.5 +.It Fn ilogbf +.Fx 2.0 +.It Fn logbf +.Fx 2.0 +.It Fn ilogbl +.Fx 5.4 +.It Fn logbl +.Fx 8.0 +.El |