1/*	$OpenBSD: fileext.h,v 1.2 2005/06/17 20:40:32 espie Exp $	*/
2/* $NetBSD: fileext.h,v 1.5 2003/07/18 21:46:41 nathanw Exp $ */
3
4/*-
5 * Copyright (c)2001 Citrus Project,
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $Citrus$
30 */
31
32#include <pthread.h>
33#include "wcio.h"
34
35/*
36 * file extension
37 */
38struct __sfileext {
39	struct	__sbuf _ub; /* ungetc buffer */
40	struct wchar_io_data _wcio;	/* wide char io status */
41	pthread_mutex_t _lock; /* file lock */
42};
43
44#define _FILEEXT_INITIALIZER  {{NULL,0},{0},PTHREAD_RECURSIVE_MUTEX_INITIALIZER}
45
46#define _EXT(fp) ((struct __sfileext *)((fp)->_ext._base))
47#define _UB(fp) _EXT(fp)->_ub
48#define _FLOCK(fp)  _EXT(fp)->_lock
49
50#define _FILEEXT_INIT(fp) \
51do { \
52	_UB(fp)._base = NULL; \
53	_UB(fp)._size = 0; \
54	WCIO_INIT(fp); \
55	_FLOCK_INIT(fp); \
56} while (0)
57
58/* Helper macros to avoid a function call when you know that fp is not NULL.
59 * Notice that we keep _FLOCK_INIT() fast by slightly breaking our pthread
60 * encapsulation.
61 */
62#define _FLOCK_INIT(fp)    _FLOCK(fp).value = __PTHREAD_RECURSIVE_MUTEX_INIT_VALUE
63#define _FLOCK_LOCK(fp)    pthread_mutex_lock(&_FLOCK(fp))
64#define _FLOCK_TRYLOCK(fp) pthread_mutex_trylock(&_FLOCK(fp))
65#define _FLOCK_UNLOCK(fp)  pthread_mutex_unlock(&_FLOCK(fp))
66
67#define _FILEEXT_SETUP(f, fext) \
68do { \
69	(f)->_ext._base = (unsigned char *)(fext); \
70	_FILEEXT_INIT(f); \
71} while (0)
72