multibyte.h revision 1.6 
1/*	$NetBSD: multibyte.h,v 1.6 2013/08/18 20:03:48 joerg 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#define _RUNE_LOCALE(loc) \
53    ((_RuneLocale *)((loc)->part_impl[(size_t)LC_CTYPE]))
54
55#define _CITRUS_CTYPE(loc) \
56    (((_RuneLocale *)((loc)->part_impl[(size_t)LC_CTYPE]))->rl_citrus_ctype)
57
58/* */
59
60static __inline _RuneState *
61_ps_to_runestate(mbstate_t *ps)
62{
63	return (_RuneState *)(void *)ps;
64}
65
66static __inline _RuneState const *
67_ps_to_runestate_const(mbstate_t const *ps)
68{
69	return (_RuneState const *)(void const *)ps;
70}
71
72static __inline _RuneLocale *
73_ps_to_runelocale(mbstate_t const *ps)
74{
75	return _ps_to_runestate_const(ps)->rs_runelocale;
76}
77
78static __inline _citrus_ctype_t
79_ps_to_ctype(mbstate_t const *ps, locale_t loc)
80{
81	if (!ps)
82		return _CITRUS_CTYPE(loc);
83
84	_DIAGASSERT(_ps_to_runelocale(ps) != NULL);
85
86	return _ps_to_runelocale(ps)->rl_citrus_ctype;
87}
88
89static __inline void *
90_ps_to_private(mbstate_t *ps)
91{
92	if (ps == NULL)
93		return NULL;
94	return (void *)&_ps_to_runestate(ps)->rs_private;
95}
96
97static __inline void const *
98_ps_to_private_const(mbstate_t const *ps)
99{
100	if (ps == NULL)
101		return NULL;
102	return (void const *)&_ps_to_runestate_const(ps)->rs_private;
103}
104
105static __inline void
106_init_ps(_RuneLocale *rl, mbstate_t *ps)
107{
108	size_t dum;
109	_ps_to_runestate(ps)->rs_runelocale = rl;
110	_citrus_ctype_mbrtowc(rl->rl_citrus_ctype, NULL, NULL, 0,
111			      _ps_to_private(ps), &dum);
112}
113
114static __inline void
115_fixup_ps(_RuneLocale *rl, mbstate_t *ps, int forceinit)
116{
117	/* for future multi-locale facility */
118	_DIAGASSERT(rl != NULL);
119
120	if (ps != NULL && (_ps_to_runelocale(ps) == NULL || forceinit)) {
121		_init_ps(rl, ps);
122	}
123}
124
125#endif /*_MULTIBYTE_H_*/
126