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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 ilogb 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-ilogb, ilogbf, ilogbl \- get integer exponent of a floating-point value
-.SH LIBRARY
-Math library
-.RI ( libm ", " \-lm )
-.SH SYNOPSIS
-.nf
-.B #include <math.h>
-.P
-.BI "int ilogb(double " x );
-.BI "int ilogbf(float " x );
-.BI "int ilogbl(long double " x );
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR ilogb ():
-.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 ilogbf (),
-.BR ilogbl ():
-.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 return the exponent part of their argument
-as a signed integer.
-When no error occurs, these functions
-are equivalent to the corresponding
-.BR logb (3)
-functions, cast to
-.IR int .
-.SH RETURN VALUE
-On success, these functions return the exponent of
-.IR x ,
-as a signed integer.
-.P
-If
-.I x
-is zero, then a domain error occurs, and the functions return
-.\" the POSIX.1 spec for logb() says logb() gives pole error for this
-.\" case, but for ilogb() it says domain error.
-.BR FP_ILOGB0 .
-.\" glibc: The numeric value is either `INT_MIN' or `-INT_MAX'.
-.P
-If
-.I x
-is a NaN, then a domain error occurs, and the functions return
-.BR FP_ILOGBNAN .
-.\" glibc: The numeric value is either `INT_MIN' or `INT_MAX'.
-.\" On i386, FP_ILOGB0 and FP_ILOGBNAN have the same value.
-.P
-If
-.I x
-is negative infinity or positive infinity, then
-a domain error occurs, and the functions return
-.BR INT_MAX .
-.\"
-.\" POSIX.1-2001 also says:
-.\" If the correct value is greater than {INT_MAX}, {INT_MAX}
-.\" shall be returned and a domain error shall occur.
-.\"
-.\" If the correct value is less than {INT_MIN}, {INT_MIN}
-.\" shall be returned and a domain error shall occur.
-.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
-Domain error: \fIx\fP is 0 or a NaN
-An invalid floating-point exception
-.RB ( FE_INVALID )
-is raised, and
-.I errno
-is set to
-.B EDOM
-(but see BUGS).
-.TP
-Domain error: \fIx\fP is an infinity
-An invalid floating-point exception
-.RB ( FE_INVALID )
-is raised, and
-.I errno
-is set to
-.B EDOM
-(but see BUGS).
-.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 ilogb (),
-.BR ilogbf (),
-.BR ilogbl ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-C11, POSIX.1-2008.
-.SH HISTORY
-C99, POSIX.1-2001.
-.SH BUGS
-.\" Bug raised: https://www.sourceware.org/bugzilla/show_bug.cgi?id=6794
-Before glibc 2.16, the following bugs existed in the
-glibc implementation of these functions:
-.IP \[bu] 3
-The domain error case where
-.I x
-is 0 or a NaN did not cause
-.I errno
-to be set or (on some architectures) raise a floating-point exception.
-.IP \[bu]
-The domain error case where
-.I x
-is an infinity did not cause
-.I errno
-to be set or raise a floating-point exception.
-.SH SEE ALSO
-.BR log (3),
-.BR logb (3),
-.BR significand (3)