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Commit	Line	Data
	1	/*-
	2	* Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved.
	3	* Copyright (c) 1993
	4	* The Regents of the University of California. All rights reserved.
	5	*
	6	* This code is derived from software contributed to Berkeley by
	7	* Paul Borman at Krystal Technologies.
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	* 1. Redistributions of source code must retain the above copyright
	13	* notice, this list of conditions and the following disclaimer.
	14	* 2. Redistributions in binary form must reproduce the above copyright
	15	* notice, this list of conditions and the following disclaimer in the
	16	* documentation and/or other materials provided with the distribution.
	17	* 3. All advertising materials mentioning features or use of this software
	18	* must display the following acknowledgement:
	19	* This product includes software developed by the University of
	20	* California, Berkeley and its contributors.
	21	* 4. Neither the name of the University nor the names of its contributors
	22	* may be used to endorse or promote products derived from this software
	23	* without specific prior written permission.
	24	*
	25	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	26	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	27	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	28	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	29	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	30	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	31	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	32	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	33	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	34	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	35	* SUCH DAMAGE.
	36	*/
	37
	38	#if defined(LIBC_SCCS) && !defined(lint)
	39	static char sccsid[] = "@(#)big5.c 8.1 (Berkeley) 6/4/93";
	40	#endif /* LIBC_SCCS and not lint */
	41	#include <sys/cdefs.h>
	42	__FBSDID("$FreeBSD: src/lib/libc/locale/big5.c,v 1.18 2007/10/13 16:28:21 ache Exp $");
	43
	44	#include "xlocale_private.h"
	45
	46	#include <sys/types.h>
	47	#include <errno.h>
	48	#include <runetype.h>
	49	#include <stdlib.h>
	50	#include <string.h>
	51	#include <wchar.h>
	52	#include "mblocal.h"
	53
	54	static size_t _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict,
	55	size_t, mbstate_t * __restrict, locale_t);
	56	static int _BIG5_mbsinit(const mbstate_t *, locale_t);
	57	static size_t _BIG5_wcrtomb(char * __restrict, wchar_t,
	58	mbstate_t * __restrict, locale_t);
	59
	60	typedef struct {
	61	wchar_t ch;
	62	} _BIG5State;
	63
	64	int
	65	_BIG5_init(struct __xlocale_st_runelocale *xrl)
	66	{
	67
	68	xrl->__mbrtowc = _BIG5_mbrtowc;
	69	xrl->__wcrtomb = _BIG5_wcrtomb;
	70	xrl->__mbsinit = _BIG5_mbsinit;
	71	xrl->__mb_cur_max = 2;
	72	xrl->__mb_sb_limit = 128;
	73	return (0);
	74	}
	75
	76	static int
	77	_BIG5_mbsinit(const mbstate_t *ps, locale_t loc __unused)
	78	{
	79
	80	return (ps == NULL \|\| ((const _BIG5State *)ps)->ch == 0);
	81	}
	82
	83	static __inline int
	84	_big5_check(u_int c)
	85	{
	86
	87	c &= 0xff;
	88	return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1);
	89	}
	90
	91	static size_t
	92	_BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
	93	mbstate_t * __restrict ps, locale_t loc __unused)
	94	{
	95	_BIG5State *bs;
	96	wchar_t wc;
	97	size_t len;
	98
	99	bs = (_BIG5State *)ps;
	100
	101	if ((bs->ch & ~0xFF) != 0) {
	102	/* Bad conversion state. */
	103	errno = EINVAL;
	104	return ((size_t)-1);
	105	}
	106
	107	if (s == NULL) {
	108	s = "";
	109	n = 1;
	110	pwc = NULL;
	111	}
	112
	113	if (n == 0)
	114	/* Incomplete multibyte sequence */
	115	return ((size_t)-2);
	116
	117	if (bs->ch != 0) {
	118	if (*s == '\0') {
	119	errno = EILSEQ;
	120	return ((size_t)-1);
	121	}
	122	wc = (bs->ch << 8) \| (*s & 0xFF);
	123	if (pwc != NULL)
	124	*pwc = wc;
	125	bs->ch = 0;
	126	return (1);
	127	}
	128
	129	len = (size_t)_big5_check(*s);
	130	wc = *s++ & 0xff;
	131	if (len == 2) {
	132	if (n < 2) {
	133	/* Incomplete multibyte sequence */
	134	bs->ch = wc;
	135	return ((size_t)-2);
	136	}
	137	if (*s == '\0') {
	138	errno = EILSEQ;
	139	return ((size_t)-1);
	140	}
	141	wc = (wc << 8) \| (*s++ & 0xff);
	142	if (pwc != NULL)
	143	*pwc = wc;
	144	return (2);
	145	} else {
	146	if (pwc != NULL)
	147	*pwc = wc;
	148	return (wc == L'\0' ? 0 : 1);
	149	}
	150	}
	151
	152	static size_t
	153	_BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused)
	154	{
	155	_BIG5State *bs;
	156
	157	bs = (_BIG5State *)ps;
	158
	159	if (bs->ch != 0) {
	160	errno = EINVAL;
	161	return ((size_t)-1);
	162	}
	163
	164	if (s == NULL)
	165	/* Reset to initial shift state (no-op) */
	166	return (1);
	167	if (wc & 0x8000) {
	168	*s++ = (wc >> 8) & 0xff;
	169	*s = wc & 0xff;
	170	return (2);
	171	}
	172	*s = wc & 0xff;
	173	return (1);
	174	}