93 lines
3.0 KiB
Groff
93 lines
3.0 KiB
Groff
.\" $NetBSD: stddef.3,v 1.7 2010/05/14 02:45:39 joerg Exp $
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.\"
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.\" Copyright (c) 2010 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jukka Ruohonen.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd March 21, 2010
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.Dt STDDEF 3
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.Os
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.Sh NAME
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.Nm stddef
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.Nd standard type definitions
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.Sh SYNOPSIS
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.In stddef.h
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.Sh DESCRIPTION
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The
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.In stddef.h
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header defines the following types and macros:
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.Bl -enum -offset 4n
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.It
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.Vt ptrdiff_t ,
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a signed integer type of the result of subtracting two pointers;
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.It
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.Vt size_t ,
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an unsigned integer type of the result of the
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.Fn sizeof
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operator;
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.It
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.Vt wchar_t ,
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an integer type whose range of values can represent distinct wide-character
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codes for all members of the largest character set specified among the
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supported locales: the null character has the code value 0 and each member
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of the character set has a code value equal to its value when used
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as the lone character in an integer character constant;
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.It
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.Dv NULL ,
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which expands to an implementation-defined null pointer constant; and
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.It
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.Fn offsetof ,
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a macro that expands to an integer constant as described in
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.Xr offsetof 3 .
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.El
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.Pp
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Some of the described types and macros may appear also in other headers.
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.Sh SEE ALSO
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.Xr offsetof 3 ,
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.Xr stdlib 3
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.Sh STANDARDS
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As described here, the
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.In stddef.h
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header conforms to
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.St -isoC-99
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and
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.St -p1003.1-2001 .
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Some of the types and macros conform to earlier standards such as
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.St -ansiC .
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.Sh HISTORY
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In the current form the
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.In stddef.h
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header was introduced in
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.Nx 0.8 ,
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the first official release of
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.Nx .
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Some definitions such as
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.Dv NULL
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were first introduced already in the
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.In nsys/param.h
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header of
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.At v4 .
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