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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
+.TH "<stddef.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <stddef.h>
+.SH NAME
+stddef.h \- standard type definitions
+.SH SYNOPSIS
+.LP
+\fB#include <stddef.h>\fP
+.SH DESCRIPTION
+.LP
+The \fI<stddef.h>\fP header shall define the following macros:
+.TP 7
+NULL
+Null pointer constant.
+.TP 7
+offsetof(\fItype\fP, \fImember-designator\fP)
+.sp
+Integer constant expression of type \fBsize_t\fP, the value of which
+is the offset in bytes to the structure member
+(\fImember-designator\fP), from the beginning of its structure (\fItype\fP).
+.sp
+.LP
+The \fI<stddef.h>\fP header shall define the following types:
+.TP 7
+\fBptrdiff_t\fP
+Signed integer type of the result of subtracting two pointers.
+.TP 7
+\fBwchar_t\fP
+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.
+.TP 7
+\fBsize_t\fP
+Unsigned integer type of the result of the \fIsizeof\fP operator.
+.sp
+.LP
+The implementation shall support one or more programming environments
+in which the widths of \fBptrdiff_t\fP, \fBsize_t\fP,
+and \fBwchar_t\fP are no greater than the width of type \fBlong\fP.
+The names of these programming environments can be obtained
+using the \fIconfstr\fP() function or the \fIgetconf\fP utility.
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fI<wchar.h>\fP , \fI<sys/types.h>\fP , the System
+Interfaces volume of IEEE\ Std\ 1003.1-2001, \fIconfstr\fP(), the
+Shell and
+Utilities volume of IEEE\ Std\ 1003.1-2001, \fIgetconf\fP
+.SH COPYRIGHT
+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
+http://www.opengroup.org/unix/online.html .