1/* $NetBSD: wcio.h,v 1.4 2022/04/19 20:32:16 rillig Exp $ */
2
3/*-
4 * Copyright (c)2001 Citrus Project,
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $Citrus$
29 */
30
31#ifndef _WCIO_H_
32#define _WCIO_H_
33
34#include <wchar.h> /* for mbstate_t and wchar_t */
35
36/* minimal requirement of SUSv2 */
37#define WCIO_UNGETWC_BUFSIZE 1
38
39struct wchar_io_data {
40	mbstate_t wcio_mbstate_in;
41	mbstate_t wcio_mbstate_out;
42
43	wchar_t wcio_ungetwc_buf[WCIO_UNGETWC_BUFSIZE];
44	size_t wcio_ungetwc_inbuf;
45
46	int wcio_mode; /* orientation */
47};
48
49#define _SET_ORIENTATION(fp, mode) \
50do {\
51	struct wchar_io_data *_wcio = WCIO_GET(fp);\
52	if (_wcio && _wcio->wcio_mode == 0)\
53		_wcio->wcio_mode = (mode);\
54} while (0)
55
56/*
57 * WCIO_FREE should be called by fclose
58 */
59#define WCIO_GET(fp) (&(_EXT(fp)->_wcio))
60#define WCIO_FREE(fp) \
61do {\
62	_EXT(fp)->_wcio.wcio_mode = 0;\
63	WCIO_FREEUB(fp);\
64} while (0)
65#define WCIO_FREEUB(fp) \
66do {\
67	_EXT(fp)->_wcio.wcio_ungetwc_inbuf = 0;\
68} while (0)
69
70#endif /*_WCIO_H_*/
71