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-'\" t
-.\" Copyright 2004 Andries Brouwer <aeb@cwi.nl>.
-.\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
-.\"     <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Inspired by a page by Walter Harms created 2002-08-10
-.\"
-.TH logb 3 2024-03-12 "Linux man-pages 6.7"
-.SH NAME
-logb, logbf, logbl \- get exponent of a floating-point value
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "double logb(double " x );
-.BI "float logbf(float " x );
-.BI "long double logbl(long double " x );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR logb ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-        || _XOPEN_SOURCE >= 500
-.\"    || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.P
-.BR logbf (),
-.BR logbl ():
-.nf
-    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
-        || /* Since glibc 2.19: */ _DEFAULT_SOURCE
-        || /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
-.fi
-.SH DESCRIPTION
-These functions extract the exponent from the
-internal floating-point representation of
-.I x
-and return it as a floating-point value.
-The integer constant
-.BR FLT_RADIX ,
-defined in
-.IR <float.h> ,
-indicates the radix used for the system's floating-point representation.
-If
-.B FLT_RADIX
-is 2,
-.BI logb( x )
-is similar to
-.BI floor(log2(fabs( x )))\f[R],\f[]
-except that the latter may give an incorrect integer
-due to intermediate rounding.
-.P
-If
-.I x
-is subnormal,
-.BR logb ()
-returns the exponent
-.I x
-would have if it were normalized.
-.SH RETURN VALUE
-On success, these functions return the exponent of
-.IR x .
-.P
-If
-.I x
-is a NaN,
-a NaN is returned.
-.P
-If
-.I x
-is zero, then a pole error occurs, and the functions return
-.RB \- HUGE_VAL ,
-.RB \- HUGE_VALF ,
-or
-.RB \- HUGE_VALL ,
-respectively.
-.P
-If
-.I x
-is negative infinity or positive infinity, then
-positive infinity is returned.
-.SH ERRORS
-See
-.BR math_error (7)
-for information on how to determine whether an error has occurred
-when calling these functions.
-.P
-The following errors can occur:
-.TP
-Pole error: \fIx\fP is 0
-.\" .I errno
-.\" is set to
-.\" .BR ERANGE .
-A divide-by-zero floating-point exception
-.RB ( FE_DIVBYZERO )
-is raised.
-.P
-These functions do not set
-.IR errno .
-.\" FIXME . Is it intentional that these functions do not set errno?
-.\" log(), log2(), log10() do set errno
-.\" Bug raised: https://www.sourceware.org/bugzilla/show_bug.cgi?id=6793
-.\"
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR logb (),
-.BR logbf (),
-.BR logbl ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.TP
-.BR logb ()
-4.3BSD
-(see IEEE.3 in the 4.3BSD manual).
-.SH SEE ALSO
-.BR ilogb (3),
-.BR log (3)