[apple/libc.git] / locale / FreeBSD / gb2312.c

/*-
 * Copyright (c) 2004 Tim J. Robbins. All rights reserved.
 * Copyright (c) 2003 David Xu <davidxu@freebsd.org>
 * 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.
 */

#include <sys/param.h>
__FBSDID("$FreeBSD: src/lib/libc/locale/gb2312.c,v 1.10 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 GB2312_MB_CUR_MAX	2

static size_t	_GB2312_mbrtowc(wchar_t * __restrict, const char * __restrict,
		    size_t, mbstate_t * __restrict, locale_t);
static int	_GB2312_mbsinit(const mbstate_t *, locale_t);
static size_t	_GB2312_wcrtomb(char * __restrict, wchar_t,
		    mbstate_t * __restrict, locale_t);
typedef struct {
	int	count;
	u_char	bytes[2];
} _GB2312State;

int
_GB2312_init(struct __xlocale_st_runelocale *xrl)
{

	xrl->__mbrtowc = _GB2312_mbrtowc;
	xrl->__wcrtomb = _GB2312_wcrtomb;
	xrl->__mbsinit = _GB2312_mbsinit;
	xrl->__mb_cur_max = GB2312_MB_CUR_MAX;
	xrl->__mb_sb_limit = 128;
	return (0);
}

static int
_GB2312_mbsinit(const mbstate_t *ps, locale_t loc __unused)
{

	return (ps == NULL || ((const _GB2312State *)ps)->count == 0);
}

static __inline int
_GB2312_check(const char *str, size_t n)
{
	const u_char *s = (const u_char *)str;

	if (n == 0)
		/* Incomplete multibyte sequence */
		return (-2);
	if (s[0] >= 0xa1 && s[0] <= 0xfe) {
		if (n < 2)
			/* Incomplete multibyte sequence */
			return (-2);
		if (s[1] < 0xa1 || s[1] > 0xfe)
			/* Invalid multibyte sequence */
			return (-1);
		return (2);
	} else if (s[0] & 0x80) {
		/* Invalid multibyte sequence */
		return (-1);
	} 
	return (1);
}

static size_t
_GB2312_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
    mbstate_t * __restrict ps, locale_t loc __unused)
{
	_GB2312State *gs;
	wchar_t wc;
	int i, len, ocount;
	size_t ncopy;

	gs = (_GB2312State *)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, GB2312_MB_CUR_MAX), sizeof(gs->bytes) - gs->count);
	strncpy(gs->bytes + gs->count, s, ncopy);
	ocount = gs->count;
	gs->count += ncopy;
	s = (char *)gs->bytes;
	n = gs->count;

	if ((len = _GB2312_check(s, n)) < 0)
		return ((size_t)len);
	wc = 0;
	i = len;
	while (i-- > 0)
		wc = (wc << 8) | (unsigned char)*s++;
	if (pwc != NULL)
		*pwc = wc;
	gs->count = 0;
	return (wc == L'\0' ? 0 : len - ocount);
}

static size_t
_GB2312_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused)
{
	_GB2312State *gs;

	gs = (_GB2312State *)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 & 0x8000) {
		*s++ = (wc >> 8) & 0xff;
		*s = wc & 0xff;
		return (2);
	}
	*s = wc & 0xff;
	return (1);
}
Commit	Line	Data
3d9156a7 A	1	/*-
	2	* Copyright (c) 2004 Tim J. Robbins. All rights reserved.
	3	* Copyright (c) 2003 David Xu <davidxu@freebsd.org>
	4	* All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	*
	15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
	16	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	17	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	18	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	19	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	20	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	21	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	22	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	23	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	24	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	25	* SUCH DAMAGE.
	26	*/
	27
	28	#include <sys/param.h>
1f2f436a	29	__FBSDID("$FreeBSD: src/lib/libc/locale/gb2312.c,v 1.10 2007/10/13 16:28:21 ache Exp $");
3d9156a7	30
ad3c9f2a A	31	#include "xlocale_private.h"
ad3c9f2a A	32
3d9156a7 A	33	#include <errno.h>
	34	#include <runetype.h>
	35	#include <stdlib.h>
	36	#include <string.h>
	37	#include <wchar.h>
	38	#include "mblocal.h"
	39
ad3c9f2a	40	#define GB2312_MB_CUR_MAX 2
1f2f436a A	41
1f2f436a A	42	static size_t _GB2312_mbrtowc(wchar_t * __restrict, const char * __restrict,
ad3c9f2a A	43	size_t, mbstate_t * __restrict, locale_t);
ad3c9f2a A	44	static int _GB2312_mbsinit(const mbstate_t *, locale_t);
1f2f436a	45	static size_t _GB2312_wcrtomb(char * __restrict, wchar_t,
ad3c9f2a	46	mbstate_t * __restrict, locale_t);
3d9156a7 A	47	typedef struct {
	48	int count;
	49	u_char bytes[2];
	50	} _GB2312State;
	51
23e20b00	52	int
ad3c9f2a	53	_GB2312_init(struct __xlocale_st_runelocale *xrl)
3d9156a7 A	54	{
3d9156a7 A	55
ad3c9f2a A	56	xrl->__mbrtowc = _GB2312_mbrtowc;
	57	xrl->__wcrtomb = _GB2312_wcrtomb;
	58	xrl->__mbsinit = _GB2312_mbsinit;
	59	xrl->__mb_cur_max = GB2312_MB_CUR_MAX;
	60	xrl->__mb_sb_limit = 128;
3d9156a7 A	61	return (0);
	62	}
	63
1f2f436a	64	static int
ad3c9f2a	65	_GB2312_mbsinit(const mbstate_t *ps, locale_t loc __unused)
3d9156a7 A	66	{
	67
	68	return (ps == NULL \|\| ((const _GB2312State *)ps)->count == 0);
	69	}
	70
	71	static __inline int
	72	_GB2312_check(const char *str, size_t n)
	73	{
	74	const u_char s = (const u_char )str;
	75
	76	if (n == 0)
	77	/* Incomplete multibyte sequence */
	78	return (-2);
	79	if (s[0] >= 0xa1 && s[0] <= 0xfe) {
	80	if (n < 2)
	81	/* Incomplete multibyte sequence */
	82	return (-2);
	83	if (s[1] < 0xa1 \|\| s[1] > 0xfe)
	84	/* Invalid multibyte sequence */
	85	return (-1);
	86	return (2);
	87	} else if (s[0] & 0x80) {
	88	/* Invalid multibyte sequence */
	89	return (-1);
	90	}
	91	return (1);
	92	}
	93
1f2f436a	94	static size_t
3d9156a7	95	_GB2312_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
ad3c9f2a	96	mbstate_t * __restrict ps, locale_t loc __unused)
3d9156a7 A	97	{
	98	_GB2312State *gs;
	99	wchar_t wc;
	100	int i, len, ocount;
	101	size_t ncopy;
	102
	103	gs = (_GB2312State *)ps;
	104
	105	if (gs->count < 0 \|\| gs->count > sizeof(gs->bytes)) {
	106	errno = EINVAL;
	107	return ((size_t)-1);
	108	}
	109
	110	if (s == NULL) {
	111	s = "";
	112	n = 1;
	113	pwc = NULL;
	114	}
	115
ad3c9f2a	116	ncopy = MIN(MIN(n, GB2312_MB_CUR_MAX), sizeof(gs->bytes) - gs->count);
15de9d6b	117	strncpy(gs->bytes + gs->count, s, ncopy);
3d9156a7 A	118	ocount = gs->count;
	119	gs->count += ncopy;
	120	s = (char *)gs->bytes;
	121	n = gs->count;
	122
	123	if ((len = _GB2312_check(s, n)) < 0)
	124	return ((size_t)len);
	125	wc = 0;
	126	i = len;
	127	while (i-- > 0)
	128	wc = (wc << 8) \| (unsigned char)*s++;
	129	if (pwc != NULL)
	130	*pwc = wc;
	131	gs->count = 0;
	132	return (wc == L'\0' ? 0 : len - ocount);
	133	}
	134
1f2f436a	135	static size_t
ad3c9f2a	136	_GB2312_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused)
3d9156a7 A	137	{
	138	_GB2312State *gs;
	139
	140	gs = (_GB2312State *)ps;
	141
	142	if (gs->count != 0) {
	143	errno = EINVAL;
	144	return ((size_t)-1);
	145	}
	146
	147	if (s == NULL)
	148	/* Reset to initial shift state (no-op) */
	149	return (1);
	150	if (wc & 0x8000) {
	151	*s++ = (wc >> 8) & 0xff;
	152	*s = wc & 0xff;
	153	return (2);
	154	}
	155	*s = wc & 0xff;
	156	return (1);
	157	}