gecko-dev/js/ref/jsstddef.h

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.0 (the "NPL"); you may not use this file except in
 * compliance with the NPL.  You may obtain a copy of the NPL at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the NPL is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
 * for the specific language governing rights and limitations under the
 * NPL.
 *
 * The Initial Developer of this code under the NPL is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation.  All Rights
 * Reserved.
 */

/*
 * stddef inclusion here to first declare ptrdif as a signed long instead of a
 * signed int.
 */

#ifdef _WINDOWS
# ifndef XP_WIN
# define XP_WIN
# endif
#if defined(_WIN32) || defined(WIN32)
# ifndef XP_WIN32
# define XP_WIN32
# endif
#else
# ifndef XP_WIN16
# define XP_WIN16
# endif
#endif
#endif

#ifdef XP_WIN16
#ifndef _PTRDIFF_T_DEFINED
typedef long ptrdiff_t;

/*
 * The Win16 compiler treats pointer differences as 16-bit signed values.
 * This macro allows us to treat them as 17-bit signed values, stored in
 * a 32-bit type.
 */
#define PTRDIFF(p1, p2, type)                                 \
    ((((unsigned long)(p1)) - ((unsigned long)(p2))) / sizeof(type))

#define _PTRDIFF_T_DEFINED
#endif /*_PTRDIFF_T_DEFINED*/
#else /*WIN16*/

#define PTRDIFF(p1, p2, type)                                 \
	((p1) - (p2))

#endif

#include <stddef.h>