1 files changed, 76 insertions, 0 deletions
diff --git a/lib/libc/gen/modf.3 b/lib/libc/gen/modf.3
new file mode 100644
index 00000000000..aa5434b5d17
--- /dev/null
+++ b/lib/libc/gen/modf.3
@@ -0,0 +1,76 @@
+.\"	$OpenBSD: modf.3,v 1.10 2011/07/08 22:28:33 martynas Exp $
+.\"
+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the American National Standards Committee X3, on Information
+.\" Processing Systems.
+.\"
+.\" 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.
+.\" 3. 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.
+.\"
+.Dd $Mdocdate: July 8 2011 $
+.Dt MODF 3
+.Os
+.Sh NAME
+.Nm modf ,
+.Nm modff
+.Nd extract signed integral and fractional values from floating-point number
+.Sh SYNOPSIS
+.Fd #include <math.h>
+.Ft double
+.Fn modf "double value" "double *iptr"
+.Ft float
+.Fn modff "float value" "float *iptr"
+.Sh DESCRIPTION
+The
+.Fn modf
+function breaks the argument
+.Fa value
+into integral and fractional parts, each of which has the
+same sign as the argument.
+It stores the integral part as a
+.Li double
+in the object pointed to by
+.Fa iptr .
+The
+.Fn modff
+function is a single precision version of
+.Fn modf .
+.Sh RETURN VALUES
+The
+.Fn modf
+and
+.Fn modff
+functions return the signed fractional part of
+.Fa value .
+.Sh SEE ALSO
+.Xr frexp 3 ,
+.Xr ldexp 3
+.Sh STANDARDS
+The
+.Fn modf
+function conforms to
+.St -ansiC .