POSIX adds a version that returns long int
perhaps for float128
Signed-off-by: Radisson <Radisson97@xxxxxx>
---
man3/ilogb.3 | 29 +++++++++++++++++++++++------
1 file changed, 23 insertions(+), 6 deletions(-)
diff --git a/man3/ilogb.3 b/man3/ilogb.3
index a56416fba..339a31bed 100644
--- a/man3/ilogb.3
+++ b/man3/ilogb.3
@@ -28,7 +28,8 @@
.\"
.TH ILOGB 3 2021-03-22 "" "Linux Programmer's Manual"
.SH NAME
-ilogb, ilogbf, ilogbl \- get integer exponent of a floating-point value
+ilogb, ilogbf, ilogbl, llogb, llogbf, llogbl \- get integer exponent of a
+floating-point value
.SH SYNOPSIS
.nf
.B #include <math.h>
@@ -36,6 +37,10 @@ ilogb, ilogbf, ilogbl \- get integer exponent of a floating-point value
.BI "int ilogb(double " x );
.BI "int ilogbf(float " x );
.BI "int ilogbl(long double " x );
+.PP
+.BI "long int llogb(double " x );
+.BI "long int llogbf(float " x );
+.BI "long int llogbl(long double " x );
.fi
.PP
Link with \fI\-lm\fP.
@@ -69,6 +74,11 @@ are equivalent to the corresponding
.BR logb (3)
functions, cast to
.IR int .
+.PP
+The
+.B llogb (3)
+functions do the same, but cast to
+.IR "long int" .
.SH RETURN VALUE
On success, these functions return the exponent of
.IR x ,
@@ -79,13 +89,14 @@ If
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 .
+.BR FP_ILOGB0 or
+.BR FP_LLOGB0 .
.\" glibc: The numeric value is either `INT_MIN' or `-INT_MAX'.
.PP
-If
.I x
is a NaN, then a domain error occurs, and the functions return
-.BR FP_ILOGBNAN .
+.BR FP_ILOGBNAN or
+.BR FP_LLOGBNAN .
.\" glibc: The numeric value is either `INT_MIN' or `INT_MAX'.
.\" On i386, FP_ILOGB0 and FP_ILOGBNAN have the same value.
.PP
@@ -139,18 +150,24 @@ Interface Attribute Value
T{
.BR ilogb (),
.BR ilogbf (),
-.BR ilogbl ()
+.BR ilogbl (),
+.BR llogb (),
+.BR llogbf (),
+.BR llogbl ()
T} Thread safety MT-Safe
.TE
.hy
.ad
.sp 1
.SH CONFORMING TO
+.IP ilogb 5
C99, POSIX.1-2001, POSIX.1-2008.
+.IP llogb 5
+TS 18661-3:2015, available since glibc 2.25
.SH BUGS
.\" Bug raised: http://sources.redhat.com/bugzilla/show_bug.cgi?id=6794
Before version 2.16, the following bugs existed in the
-glibc implementation of these functions:
+glibc implementation of the ilogb functions:
.IP * 3
The domain error case where
.I x
--
2.26.2
