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+.\" $NetBSD: stddef.3,v 1.8 2011/04/10 10:02:34 jruoho Exp $
+.\"
+.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jukka Ruohonen.
+.\"
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 April 10, 2011
+.Dt STDDEF 3
+.Os
+.Sh NAME
+.Nm stddef
+.Nd standard type definitions
+.Sh SYNOPSIS
+.In stddef.h
+.Sh DESCRIPTION
+The
+.In stddef.h
+header defines the following types and macros:
+.Bl -enum -offset 4n
+.It
+.Vt ptrdiff_t ,
+a signed integer type of the result of subtracting two pointers;
+.It
+.Vt size_t ,
+an unsigned integer type of the result of the
+.Fn sizeof
+operator;
+.It
+.Vt wchar_t ,
+an integer type whose range of values can represent distinct wide-character
+codes for all members of the largest character set specified among the
+supported locales: the null character has the code value 0 and each member
+of the character set has a code value equal to its value when used
+as the lone character in an integer character constant;
+.It
+.Dv NULL ,
+which expands to an implementation-defined null pointer constant; and
+.It
+.Fn offsetof ,
+a macro that expands to an integer constant as described in
+.Xr offsetof 3 .
+.El
+.Pp
+Some of the described types and macros may appear also in other headers.
+.Sh SEE ALSO
+.Xr offsetof 3 ,
+.Xr stdlib 3 ,
+.Xr unistd 3
+.Sh STANDARDS
+As described here, the
+.In stddef.h
+header conforms to
+.St -isoC-99
+and
+.St -p1003.1-2001 .
+Some of the types and macros conform to earlier standards such as
+.St -ansiC .
+.Sh HISTORY
+In the current form the
+.In stddef.h
+header was introduced in
+.Nx 0.8 ,
+the first official release of
+.Nx .
+Some definitions such as
+.Dv NULL
+were first introduced already in the
+.In nsys/param.h
+header of
+.At v4 .