gb2312.c revision 6b5e5868e7ebf1aff3a5abd7d0c4ef0e5fbf3648
/*
* Copyright 2010 Nexenta Systems, Inc. All rights reserved.
* 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 "lint.h"
#include <sys/types.h>
#include <errno.h>
#include "runetype.h"
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "mblocal.h"
static size_t _GB2312_mbrtowc(wchar_t *_RESTRICT_KYWD,
const char *_RESTRICT_KYWD,
size_t, mbstate_t *_RESTRICT_KYWD);
static int _GB2312_mbsinit(const mbstate_t *);
static size_t _GB2312_wcrtomb(char *_RESTRICT_KYWD, wchar_t,
mbstate_t *_RESTRICT_KYWD);
typedef struct {
int count;
uchar_t bytes[2];
} _GB2312State;
int
_GB2312_init(_RuneLocale *rl)
{
_CurrentRuneLocale = rl;
__mbrtowc = _GB2312_mbrtowc;
__wcrtomb = _GB2312_wcrtomb;
__mbsinit = _GB2312_mbsinit;
__ctype[520] = 2;
charset_is_ascii = 0;
return (0);
}
static int
_GB2312_mbsinit(const mbstate_t *ps)
{
return (ps == NULL || ((const _GB2312State *)ps)->count == 0);
}
static int
_GB2312_check(const char *str, size_t n)
{
const uchar_t *s = (const uchar_t *)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_KYWD pwc, const char *_RESTRICT_KYWD s,
size_t n, mbstate_t *_RESTRICT_KYWD ps)
{
_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, MB_CUR_MAX), sizeof (gs->bytes) - gs->count);
(void) memcpy(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_KYWD s, wchar_t wc,
mbstate_t *_RESTRICT_KYWD ps)
{
_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);
}