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STDDEF(3) BSD Library Functions Manual STDDEF(3)
stddef -- standard type definitions
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-charac-
ter codes for all members of the largest character set specified among the sup-
ported 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
Some of the described types and macros may appear also in other headers.
offsetof(3), stdlib(3), unistd(3)
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 stan-
dards such as ANSI X3.159-1989 (``ANSI C89'').
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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