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       stddef.h - standard type definitions


       #include <stddef.h>


       The <stddef.h> header shall define 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 shall define the following types:

              Signed integer type of the result of subtracting two pointers.

              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
              member  of  the portable character set has a code value equal to
              its value  when  used  as  the  lone  character  in  an  integer
              character constant.

       size_t Unsigned integer type of the result of the sizeof operator.

       The  implementation  shall support 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()  function  or  the
       getconf utility.

       The following sections are informative.








       <wchar.h>   ,   <sys/types.h>   ,   the  System  Interfaces  volume  of
       IEEE Std 1003.1-2001, confstr(), the  Shell  and  Utilities  volume  of
       IEEE Std 1003.1-2001, getconf


       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
       event of any discrepancy between this version and the original IEEE and
       The  Open Group Standard, the original IEEE and The Open Group Standard
       is the referee document. The original Standard can be  obtained  online
       at .

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