[apple/libc.git] / locale / FreeBSD / gb18030.c

/*-
 * Copyright (c) 2002-2004 Tim J. Robbins
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/*
 * PRC National Standard GB 18030-2000 encoding of Chinese text.
 *
 * See gb18030(5) for details.
 */

#include <sys/param.h>
__FBSDID("$FreeBSD: src/lib/libc/locale/gb18030.c,v 1.8 2007/10/13 16:28:21 ache Exp $");

#include "xlocale_private.h"

#include <errno.h>
#include <runetype.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "mblocal.h"

#define GB18030_MB_CUR_MAX	4

static size_t	_GB18030_mbrtowc(wchar_t * __restrict, const char * __restrict,
		    size_t, mbstate_t * __restrict, locale_t);
static int	_GB18030_mbsinit(const mbstate_t *, locale_t);
static size_t	_GB18030_wcrtomb(char * __restrict, wchar_t,
		    mbstate_t * __restrict, locale_t);

typedef struct {
	int	count;
	u_char	bytes[4];
} _GB18030State;

int
_GB18030_init(struct __xlocale_st_runelocale *xrl)
{

	xrl->__mbrtowc = _GB18030_mbrtowc;
	xrl->__wcrtomb = _GB18030_wcrtomb;
	xrl->__mbsinit = _GB18030_mbsinit;
	xrl->__mb_cur_max = GB18030_MB_CUR_MAX;
	xrl->__mb_sb_limit = 128;

	return (0);
}

static int
_GB18030_mbsinit(const mbstate_t *ps, locale_t loc __unused)
{

	return (ps == NULL || ((const _GB18030State *)ps)->count == 0);
}

static size_t
_GB18030_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s,
    size_t n, mbstate_t * __restrict ps, locale_t loc __unused)
{
	_GB18030State *gs;
	wchar_t wch;
	int ch, len, ocount;
	size_t ncopy;

	gs = (_GB18030State *)ps;

	if (gs->count < 0 || gs->count > sizeof(gs->bytes)) {
		errno = EINVAL;
		return ((size_t)-1);
	}

	if (s == NULL) {
		s = "";
		n = 1;
		pwc = NULL;
	}

	ncopy = MIN(MIN(n, GB18030_MB_CUR_MAX), sizeof(gs->bytes) - gs->count);
	memcpy(gs->bytes + gs->count, s, ncopy);
	ocount = gs->count;
	gs->count += ncopy;
	s = (char *)gs->bytes;
	n = gs->count;

	if (n == 0)
		/* Incomplete multibyte sequence */
		return ((size_t)-2);

	/*
	 * Single byte:		[00-7f]
	 * Two byte:		[81-fe][40-7e,80-fe]
	 * Four byte:		[81-fe][30-39][81-fe][30-39]
	 */
	ch = (unsigned char)*s++;
	if (ch <= 0x7f) {
		len = 1;
		wch = ch;
	} else if (ch >= 0x81 && ch <= 0xfe) {
		wch = ch;
		if (n < 2)
			return ((size_t)-2);
		ch = (unsigned char)*s++;
		if ((ch >= 0x40 && ch <= 0x7e) || (ch >= 0x80 && ch <= 0xfe)) {
			wch = (wch << 8) | ch;
			len = 2;
		} else if (ch >= 0x30 && ch <= 0x39) {
			/*
			 * Strip high bit off the wide character we will
			 * eventually output so that it is positive when
			 * cast to wint_t on 32-bit twos-complement machines.
			 */
			wch = ((wch & 0x7f) << 8) | ch;
			if (n < 3)
				return ((size_t)-2);
			ch = (unsigned char)*s++;
			if (ch < 0x81 || ch > 0xfe)
				goto ilseq;
			wch = (wch << 8) | ch;
			if (n < 4)
				return ((size_t)-2);
			ch = (unsigned char)*s++;
			if (ch < 0x30 || ch > 0x39)
				goto ilseq;
			wch = (wch << 8) | ch;
			len = 4;
		} else
			goto ilseq;
	} else
		goto ilseq;

	if (pwc != NULL)
		*pwc = wch;
	gs->count = 0;
	return (wch == L'\0' ? 0 : len - ocount);
ilseq:
	errno = EILSEQ;
	return ((size_t)-1);
}

static size_t
_GB18030_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused)
{
	_GB18030State *gs;
	size_t len;
	int c;

	gs = (_GB18030State *)ps;

	if (gs->count != 0) {
		errno = EINVAL;
		return ((size_t)-1);
	}

	if (s == NULL)
		/* Reset to initial shift state (no-op) */
		return (1);
	if ((wc & ~0x7fffffff) != 0)
		goto ilseq;
	if (wc & 0x7f000000) {
		/* Replace high bit that mbrtowc() removed. */
		wc |= 0x80000000;
		c = (wc >> 24) & 0xff;
		if (c < 0x81 || c > 0xfe)
			goto ilseq;
		*s++ = c;
		c = (wc >> 16) & 0xff;
		if (c < 0x30 || c > 0x39)
			goto ilseq;
		*s++ = c;
		c = (wc >> 8) & 0xff;
		if (c < 0x81 || c > 0xfe)
			goto ilseq;
		*s++ = c;
		c = wc & 0xff;
		if (c < 0x30 || c > 0x39)
			goto ilseq;
		*s++ = c;
		len = 4;
	} else if (wc & 0x00ff0000)
		goto ilseq;
	else if (wc & 0x0000ff00) {
		c = (wc >> 8) & 0xff;
		if (c < 0x81 || c > 0xfe)
			goto ilseq;
		*s++ = c;
		c = wc & 0xff;
		if (c < 0x40 || c == 0x7f || c == 0xff)
			goto ilseq;
		*s++ = c;
		len = 2;
	} else if (wc <= 0x7f) {
		*s++ = wc;
		len = 1;
	} else
		goto ilseq;

	return (len);
ilseq:
	errno = EILSEQ;
	return ((size_t)-1);
}
Commit	Line	Data
3d9156a7 A	1	/*-
	2	* Copyright (c) 2002-2004 Tim J. Robbins
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	15	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	16	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	17	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	18	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	19	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	20	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	21	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	22	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	23	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	24	* SUCH DAMAGE.
	25	*/
	26	/*
	27	* PRC National Standard GB 18030-2000 encoding of Chinese text.
	28	*
	29	* See gb18030(5) for details.
	30	*/
	31
	32	#include <sys/param.h>
1f2f436a	33	__FBSDID("$FreeBSD: src/lib/libc/locale/gb18030.c,v 1.8 2007/10/13 16:28:21 ache Exp $");
3d9156a7	34
ad3c9f2a A	35	#include "xlocale_private.h"
ad3c9f2a A	36
3d9156a7 A	37	#include <errno.h>
	38	#include <runetype.h>
	39	#include <stdlib.h>
	40	#include <string.h>
	41	#include <wchar.h>
	42	#include "mblocal.h"
	43
ad3c9f2a	44	#define GB18030_MB_CUR_MAX 4
1f2f436a A	45
1f2f436a A	46	static size_t _GB18030_mbrtowc(wchar_t * __restrict, const char * __restrict,
ad3c9f2a A	47	size_t, mbstate_t * __restrict, locale_t);
ad3c9f2a A	48	static int _GB18030_mbsinit(const mbstate_t *, locale_t);
1f2f436a	49	static size_t _GB18030_wcrtomb(char * __restrict, wchar_t,
ad3c9f2a	50	mbstate_t * __restrict, locale_t);
3d9156a7 A	51
	52	typedef struct {
	53	int count;
	54	u_char bytes[4];
	55	} _GB18030State;
	56
23e20b00	57	int
ad3c9f2a	58	_GB18030_init(struct __xlocale_st_runelocale *xrl)
3d9156a7 A	59	{
3d9156a7 A	60
ad3c9f2a A	61	xrl->__mbrtowc = _GB18030_mbrtowc;
	62	xrl->__wcrtomb = _GB18030_wcrtomb;
	63	xrl->__mbsinit = _GB18030_mbsinit;
	64	xrl->__mb_cur_max = GB18030_MB_CUR_MAX;
	65	xrl->__mb_sb_limit = 128;
3d9156a7 A	66
	67	return (0);
	68	}
	69
1f2f436a	70	static int
ad3c9f2a	71	_GB18030_mbsinit(const mbstate_t *ps, locale_t loc __unused)
3d9156a7 A	72	{
	73
	74	return (ps == NULL \|\| ((const _GB18030State *)ps)->count == 0);
	75	}
	76
1f2f436a	77	static size_t
3d9156a7	78	_GB18030_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s,
ad3c9f2a	79	size_t n, mbstate_t * __restrict ps, locale_t loc __unused)
3d9156a7 A	80	{
	81	_GB18030State *gs;
	82	wchar_t wch;
	83	int ch, len, ocount;
	84	size_t ncopy;
	85
	86	gs = (_GB18030State *)ps;
	87
	88	if (gs->count < 0 \|\| gs->count > sizeof(gs->bytes)) {
	89	errno = EINVAL;
	90	return ((size_t)-1);
	91	}
	92
	93	if (s == NULL) {
	94	s = "";
	95	n = 1;
	96	pwc = NULL;
	97	}
	98
ad3c9f2a	99	ncopy = MIN(MIN(n, GB18030_MB_CUR_MAX), sizeof(gs->bytes) - gs->count);
3d9156a7 A	100	memcpy(gs->bytes + gs->count, s, ncopy);
	101	ocount = gs->count;
	102	gs->count += ncopy;
	103	s = (char *)gs->bytes;
	104	n = gs->count;
	105
	106	if (n == 0)
	107	/* Incomplete multibyte sequence */
	108	return ((size_t)-2);
	109
	110	/*
	111	* Single byte: [00-7f]
	112	* Two byte: [81-fe][40-7e,80-fe]
	113	* Four byte: [81-fe][30-39][81-fe][30-39]
	114	*/
	115	ch = (unsigned char)*s++;
	116	if (ch <= 0x7f) {
	117	len = 1;
	118	wch = ch;
	119	} else if (ch >= 0x81 && ch <= 0xfe) {
	120	wch = ch;
	121	if (n < 2)
	122	return ((size_t)-2);
	123	ch = (unsigned char)*s++;
	124	if ((ch >= 0x40 && ch <= 0x7e) \|\| (ch >= 0x80 && ch <= 0xfe)) {
	125	wch = (wch << 8) \| ch;
	126	len = 2;
	127	} else if (ch >= 0x30 && ch <= 0x39) {
	128	/*
	129	* Strip high bit off the wide character we will
	130	* eventually output so that it is positive when
	131	* cast to wint_t on 32-bit twos-complement machines.
	132	*/
	133	wch = ((wch & 0x7f) << 8) \| ch;
	134	if (n < 3)
	135	return ((size_t)-2);
	136	ch = (unsigned char)*s++;
	137	if (ch < 0x81 \|\| ch > 0xfe)
	138	goto ilseq;
	139	wch = (wch << 8) \| ch;
	140	if (n < 4)
	141	return ((size_t)-2);
	142	ch = (unsigned char)*s++;
	143	if (ch < 0x30 \|\| ch > 0x39)
	144	goto ilseq;
	145	wch = (wch << 8) \| ch;
	146	len = 4;
	147	} else
	148	goto ilseq;
	149	} else
	150	goto ilseq;
	151
	152	if (pwc != NULL)
	153	*pwc = wch;
	154	gs->count = 0;
	155	return (wch == L'\0' ? 0 : len - ocount);
	156	ilseq:
	157	errno = EILSEQ;
	158	return ((size_t)-1);
	159	}
	160
1f2f436a	161	static size_t
ad3c9f2a	162	_GB18030_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused)
3d9156a7 A	163	{
	164	_GB18030State *gs;
	165	size_t len;
	166	int c;
	167
	168	gs = (_GB18030State *)ps;
	169
	170	if (gs->count != 0) {
	171	errno = EINVAL;
	172	return ((size_t)-1);
	173	}
	174
	175	if (s == NULL)
	176	/* Reset to initial shift state (no-op) */
	177	return (1);
	178	if ((wc & ~0x7fffffff) != 0)
	179	goto ilseq;
	180	if (wc & 0x7f000000) {
	181	/* Replace high bit that mbrtowc() removed. */
	182	wc \|= 0x80000000;
	183	c = (wc >> 24) & 0xff;
	184	if (c < 0x81 \|\| c > 0xfe)
	185	goto ilseq;
	186	*s++ = c;
	187	c = (wc >> 16) & 0xff;
	188	if (c < 0x30 \|\| c > 0x39)
	189	goto ilseq;
	190	*s++ = c;
	191	c = (wc >> 8) & 0xff;
	192	if (c < 0x81 \|\| c > 0xfe)
	193	goto ilseq;
	194	*s++ = c;
	195	c = wc & 0xff;
	196	if (c < 0x30 \|\| c > 0x39)
	197	goto ilseq;
	198	*s++ = c;
	199	len = 4;
	200	} else if (wc & 0x00ff0000)
	201	goto ilseq;
	202	else if (wc & 0x0000ff00) {
	203	c = (wc >> 8) & 0xff;
	204	if (c < 0x81 \|\| c > 0xfe)
	205	goto ilseq;
	206	*s++ = c;
	207	c = wc & 0xff;
	208	if (c < 0x40 \|\| c == 0x7f \|\| c == 0xff)
	209	goto ilseq;
	210	*s++ = c;
	211	len = 2;
	212	} else if (wc <= 0x7f) {
	213	*s++ = wc;
	214	len = 1;
	215	} else
	216	goto ilseq;
	217
	218	return (len);
	219	ilseq:
	220	errno = EILSEQ;
	221	return ((size_t)-1);
	222	}