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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_
     35 typedef	_BSD_MBSTATE_T_	mbstate_t;
     36 #undef _BSD_MBSTATE_T_
     37 #endif
     38 
     39 typedef struct _RuneStatePriv {
     40 	_RuneLocale	*__runelocale;
     41 	char		__private __attribute__((__aligned__));
     42 } _RuneStatePriv;
     43 
     44 typedef 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 
     55 static __inline _citrus_ctype_t
     56 _to_cur_ctype(void)
     57 {
     58 	return (_CurrentRuneLocale->rl_citrus_ctype);
     59 }
     60 
     61 static __inline _RuneState *
     62 _ps_to_runestate(mbstate_t *ps)
     63 {
     64 	return (_RuneState *)(void *)ps;
     65 }
     66 
     67 static __inline _RuneState const *
     68 _ps_to_runestate_const(mbstate_t const *ps)
     69 {
     70 	return (_RuneState const *)(void const *)ps;
     71 }
     72 
     73 static __inline _RuneLocale *
     74 _ps_to_runelocale(mbstate_t const *ps)
     75 {
     76 	return _ps_to_runestate_const(ps)->rs_runelocale;
     77 }
     78 
     79 static __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 
     90 static __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 
     98 static __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 
    106 static __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 
    115 static __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