xref: /minix/lib/libc/stdio/wcio.h (revision 2fe8fb19)
1 /* $NetBSD: wcio.h,v 1.3 2003/01/18 11:30:00 thorpej 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 
39 struct 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) \
50 do {\
51 	struct wchar_io_data *_wcio = WCIO_GET(fp);\
52 	if (_wcio && _wcio->wcio_mode == 0)\
53 		_wcio->wcio_mode = (mode);\
54 } while (/*CONSTCOND*/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) \
61 do {\
62 	_EXT(fp)->_wcio.wcio_mode = 0;\
63 	WCIO_FREEUB(fp);\
64 } while (/*CONSTCOND*/0)
65 #define WCIO_FREEUB(fp) \
66 do {\
67 	_EXT(fp)->_wcio.wcio_ungetwc_inbuf = 0;\
68 } while (/*CONSTCOND*/0)
69 
70 #endif /*_WCIO_H_*/
71