multibyte.h revision 1.3 
1/*	$NetBSD: multibyte.h,v 1.3 2003/04/29 14:53:12 scw Exp $	*/
2
3/*-
4 * Copyright (c)2002 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
29#ifndef _MULTIBYTE_H_
30#define _MULTIBYTE_H_
31
32/* mbstate_t private */
33
34#ifdef _BSD_MBSTATE_T_
35typedef	_BSD_MBSTATE_T_	mbstate_t;
36#undef _BSD_MBSTATE_T_
37#endif
38
39typedef struct _RuneStatePriv {
40	_RuneLocale	*__runelocale;
41	char		__private __attribute__((__aligned__));
42} _RuneStatePriv;
43
44typedef union _RuneState {
45	mbstate_t		__pad;
46	struct _RuneStatePriv	__priv;
47#define rs_runelocale		__priv.__runelocale
48#define rs_private		__priv.__private
49} _RuneState;
50#define _PRIVSIZE	(sizeof(mbstate_t)-offsetof(_RuneStatePriv, __private))
51
52
53/* */
54
55static __inline _citrus_ctype_t
56_to_cur_ctype(void)
57{
58	return (_CurrentRuneLocale->rl_citrus_ctype);
59}
60
61static __inline _RuneState *
62_ps_to_runestate(mbstate_t *ps)
63{
64	return (_RuneState *)(void *)ps;
65}
66
67static __inline _RuneState const *
68_ps_to_runestate_const(mbstate_t const *ps)
69{
70	return (_RuneState const *)(void const *)ps;
71}
72
73static __inline _RuneLocale *
74_ps_to_runelocale(mbstate_t const *ps)
75{
76	return _ps_to_runestate_const(ps)->rs_runelocale;
77}
78
79static __inline _citrus_ctype_t
80_ps_to_ctype(mbstate_t const *ps)
81{
82	if (!ps)
83		return _to_cur_ctype();
84
85	_DIAGASSERT(_ps_to_runelocale(ps) != NULL);
86
87	return _ps_to_runelocale(ps)->rl_citrus_ctype;
88}
89
90static __inline void *
91_ps_to_private(mbstate_t *ps)
92{
93	if (ps == NULL)
94		return NULL;
95	return (void *)&_ps_to_runestate(ps)->rs_private;
96}
97
98static __inline void const *
99_ps_to_private_const(mbstate_t const *ps)
100{
101	if (ps == NULL)
102		return NULL;
103	return (void const *)&_ps_to_runestate_const(ps)->rs_private;
104}
105
106static __inline void
107_init_ps(_RuneLocale *rl, mbstate_t *ps)
108{
109	size_t dum;
110	_ps_to_runestate(ps)->rs_runelocale = rl;
111	_citrus_ctype_mbrtowc(rl->rl_citrus_ctype, NULL, NULL, 0,
112			      _ps_to_private(ps), &dum);
113}
114
115static __inline void
116_fixup_ps(_RuneLocale *rl, mbstate_t *ps, int forceinit)
117{
118	/* for future multi-locale facility */
119	_DIAGASSERT(rl != NULL);
120
121	if (ps != NULL && (_ps_to_runelocale(ps) == NULL || forceinit)) {
122		_init_ps(rl, ps);
123	}
124}
125
126#endif
127