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+.\"	$OpenBSD: trunc.3,v 1.9 2025/06/07 10:33:06 schwarze Exp $
+.\"
+.\" Copyright (c) 2004, 2005 David Schultz <das@FreeBSD.org>
+.\" 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.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+.\"
+.\" $FreeBSD: src/lib/msun/man/trunc.3,v 1.3 2005/06/15 19:04:04 ru Exp $
+.\"
+.Dd $Mdocdate: June 7 2025 $
+.Dt TRUNC 3
+.Os
+.Sh NAME
+.Nm trunc ,
+.Nm truncf ,
+.Nm truncl
+.Nd nearest integral value with magnitude less than or equal to |x|
+.Sh SYNOPSIS
+.Lb libm
+.In math.h
+.Ft double
+.Fn trunc "double x"
+.Ft float
+.Fn truncf "float x"
+.Ft long double
+.Fn truncl "long double x"
+.Sh DESCRIPTION
+The
+.Fn trunc ,
+.Fn truncf
+and
+.Fn truncl
+functions return the nearest integral value with magnitude less than
+or equal to
+.Pf | Fa x Ns | .
+They are equivalent to
+.Fn rint ,
+.Fn rintf
+and
+.Fn rintl
+respectively, in the rounding towards zero mode.
+.Sh SEE ALSO
+.Xr ceil 3 ,
+.Xr fesetround 3 ,
+.Xr floor 3 ,
+.Xr nextafter 3 ,
+.Xr rint 3 ,
+.Xr round 3
+.Sh STANDARDS
+The
+.Fn trunc ,
+.Fn truncf
+and
+.Fn truncl
+functions conform to
+.St -isoC-99 .