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      1 /*	$NetBSD: multibyte.h,v 1.8 2024/06/07 13:53:23 riastradh 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 #include <stdalign.h>
     33 
     34 /* mbstate_t private */
     35 
     36 #ifdef _BSD_MBSTATE_T_
     37 typedef	_BSD_MBSTATE_T_	mbstate_t;
     38 #undef _BSD_MBSTATE_T_
     39 #endif
     40 
     41 typedef struct _RuneStatePriv {
     42 	_RuneLocale	*__runelocale;
     43 	char		__private[];
     44 } _RuneStatePriv;
     45 
     46 __CTASSERT(alignof(struct _RuneStatePriv) >= alignof(void *));
     47 __CTASSERT(sizeof(_RuneStatePriv) % alignof(void *) == 0);
     48 __CTASSERT(alignof(struct _RuneStatePriv) >= alignof(int));
     49 __CTASSERT(sizeof(_RuneStatePriv) % alignof(int) == 0);
     50 
     51 typedef union _RuneState {
     52 	mbstate_t		__pad;
     53 	struct _RuneStatePriv	__priv;
     54 #define rs_runelocale		__priv.__runelocale
     55 #define rs_private		__priv.__private
     56 } _RuneState;
     57 #define _PRIVSIZE	(sizeof(mbstate_t)-offsetof(_RuneStatePriv, __private))
     58 
     59 #define _RUNE_LOCALE(loc) \
     60     ((_RuneLocale *)((loc)->part_impl[LC_CTYPE]))
     61 
     62 #define _CITRUS_CTYPE(loc) \
     63     (((_RuneLocale *)((loc)->part_impl[LC_CTYPE]))->rl_citrus_ctype)
     64 
     65 /* */
     66 
     67 static __inline _RuneState *
     68 _ps_to_runestate(mbstate_t *ps)
     69 {
     70 	return (_RuneState *)(void *)ps;
     71 }
     72 
     73 static __inline _RuneState const *
     74 _ps_to_runestate_const(mbstate_t const *ps)
     75 {
     76 	return (_RuneState const *)(void const *)ps;
     77 }
     78 
     79 static __inline _RuneLocale *
     80 _ps_to_runelocale(mbstate_t const *ps)
     81 {
     82 	return _ps_to_runestate_const(ps)->rs_runelocale;
     83 }
     84 
     85 static __inline _citrus_ctype_t
     86 _ps_to_ctype(mbstate_t const *ps, locale_t loc)
     87 {
     88 	if (!ps)
     89 		return _CITRUS_CTYPE(loc);
     90 
     91 	_DIAGASSERT(_ps_to_runelocale(ps) != NULL);
     92 
     93 	return _ps_to_runelocale(ps)->rl_citrus_ctype;
     94 }
     95 
     96 static __inline void *
     97 _ps_to_private(mbstate_t *ps)
     98 {
     99 	if (ps == NULL)
    100 		return NULL;
    101 	return _ps_to_runestate(ps)->rs_private;
    102 }
    103 
    104 static __inline void const *
    105 _ps_to_private_const(mbstate_t const *ps)
    106 {
    107 	if (ps == NULL)
    108 		return NULL;
    109 	return _ps_to_runestate_const(ps)->rs_private;
    110 }
    111 
    112 static __inline void
    113 _init_ps(_RuneLocale *rl, mbstate_t *ps)
    114 {
    115 	size_t dum;
    116 	_ps_to_runestate(ps)->rs_runelocale = rl;
    117 	_citrus_ctype_mbrtowc(rl->rl_citrus_ctype, NULL, NULL, 0,
    118 			      _ps_to_private(ps), &dum);
    119 }
    120 
    121 static __inline void
    122 _fixup_ps(_RuneLocale *rl, mbstate_t *ps, int forceinit)
    123 {
    124 	/* for future multi-locale facility */
    125 	_DIAGASSERT(rl != NULL);
    126 
    127 	if (ps != NULL && (_ps_to_runelocale(ps) == NULL || forceinit)) {
    128 		_init_ps(rl, ps);
    129 	}
    130 }
    131 
    132 #endif /*_MULTIBYTE_H_*/
    133