$NetBSD: stddef.3,v 1.7 2010/05/14 02:45:39 joerg 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
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1. Redistributions of source code must retain the above copyright
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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
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.Dd April 10, 2011 .Dt STDDEF 3 .Os .Sh NAME .Nm stddef .Nd standard type definitions .Sh SYNOPSIS n stddef.h .Sh DESCRIPTION The n stddef.h header defines the following types and macros: l -enum -offset 4n t .Vt ptrdiff_t , a signed integer type of the result of subtracting two pointers; t .Vt size_t , an unsigned integer type of the result of the .Fn sizeof operator; t .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; t .Dv NULL , which expands to an implementation-defined null pointer constant; and t .Fn offsetof , a macro that expands to an integer constant as described in .Xr offsetof 3 . .El
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 n stddef.h .Sh DESCRIPTION The n stddef.h header defines the following types and macros: l -enum -offset 4n t .Vt ptrdiff_t , a signed integer type of the result of subtracting two pointers; t .Vt size_t , an unsigned integer type of the result of the .Fn sizeof operator; t .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; t .Dv NULL , which expands to an implementation-defined null pointer constant; and t .Fn offsetof , a macro that expands to an integer constant as described in .Xr offsetof 3 . .El
p 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 n 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 n 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 n nsys/param.h header of .At v4 .