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stddef(3) [netbsd man page]

STDDEF(3)						   BSD Library Functions Manual 						 STDDEF(3)

NAME
stddef -- standard type definitions SYNOPSIS
#include <stddef.h> DESCRIPTION
The <stddef.h> header defines the following types and macros: 1. ptrdiff_t, a signed integer type of the result of subtracting two pointers; 2. size_t, an unsigned integer type of the result of the sizeof() operator; 3. 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; 4. NULL, which expands to an implementation-defined null pointer constant; and 5. offsetof(), a macro that expands to an integer constant as described in offsetof(3). Some of the described types and macros may appear also in other headers. SEE ALSO
offsetof(3), stdlib(3), unistd(3) STANDARDS
As described here, the <stddef.h> header conforms to ISO/IEC 9899:1999 (``ISO C99'') and IEEE Std 1003.1-2001 (``POSIX.1''). Some of the types and macros conform to earlier standards such as ANSI X3.159-1989 (``ANSI C89''). HISTORY
In the current form the <stddef.h> header was introduced in NetBSD 0.8, the first official release of NetBSD. Some definitions such as NULL were first introduced already in the <nsys/param.h> header of Version 4 AT&T UNIX. BSD
April 10, 2011 BSD

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stddef.h(3HEAD) 						      Headers							   stddef.h(3HEAD)

NAME
stddef.h, stddef - standard type definitions SYNOPSIS
#include <stddef.h> DESCRIPTION
The <stddef.h> header defines the following macros: NULL Null pointer constant. offsetof(type, member-designator) Integer constant expression of type size_t, the value of which is the offset in bytes to the structure member (member-designator), from the beginning of its structure (type). The <stddef.h> header defines the following types: ptrdiff_t Signed integer type of the result of subtracting two pointers. wchar_t Integer type whose range of values can represent distinct wide-character codes for all members of the largest character set specified among the locales supported by the compilation environment: the null character has the code value 0 and each mem- ber of the portable character set has a code value equal to its value when used as the lone character in an integer charac- ter constant. size_t Unsigned integer type of the result of the sizeof operator. The implementation supports one or more programming environments in which the widths of ptrdiff_t, size_t, and wchar_t are no greater than the width of type long. The names of these programming environments can be obtained using the confstr(3C) function or the getconf(1) util- ity. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
getconf(1), confstr(3C), types.h(3HEAD), wchar.h(3HEAD), attributes(5), standards(5) SunOS 5.10 10 Sep 2004 stddef.h(3HEAD)

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