146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/*-
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* Copyright (c) 2004 Tim J. Robbins. All rights reserved.
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* Copyright (c) 2003 David Xu <davidxu@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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__FBSDID("$FreeBSD$");
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#include <runetype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <wchar.h>
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extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict,
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size_t, mbstate_t * __restrict);
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extern int (*__mbsinit)(const mbstate_t *);
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extern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict);
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int _GB2312_init(_RuneLocale *);
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size_t _GB2312_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t,
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mbstate_t * __restrict);
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int _GB2312_mbsinit(const mbstate_t *);
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size_t _GB2312_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);
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typedef struct {
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int count;
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u_char bytes[2];
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} _GB2312State;
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int
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_GB2312_init(_RuneLocale *rl)
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{
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_CurrentRuneLocale = rl;
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__mbrtowc = _GB2312_mbrtowc;
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__wcrtomb = _GB2312_wcrtomb;
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__mbsinit = _GB2312_mbsinit;
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__mb_cur_max = 2;
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return (0);
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}
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int
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_GB2312_mbsinit(const mbstate_t *ps)
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{
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return (ps == NULL || ((_GB2312State *)ps)->count == 0);
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}
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static __inline int
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_GB2312_check(const char *str, size_t n)
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{
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const u_char *s = (const u_char *)str;
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if (n == 0)
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/* Incomplete multibyte sequence */
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return (-2);
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if (s[0] >= 0xa1 && s[0] <= 0xfe) {
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if (n < 2)
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/* Incomplete multibyte sequence */
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return (-2);
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if (s[1] < 0xa1 || s[1] > 0xfe)
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/* Invalid multibyte sequence */
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return (-1);
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return (2);
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} else if (s[0] & 0x80) {
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/* Invalid multibyte sequence */
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return (-1);
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}
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return (1);
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}
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size_t
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_GB2312_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n,
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mbstate_t * __restrict ps)
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{
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_GB2312State *gs;
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wchar_t wc;
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int i, len, ocount;
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size_t ncopy;
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gs = (_GB2312State *)gs;
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if (s == NULL) {
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s = "";
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n = 1;
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pwc = NULL;
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}
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ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count);
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memcpy(gs->bytes + gs->count, s, ncopy);
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ocount = gs->count;
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gs->count += ncopy;
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s = (char *)gs->bytes;
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n = gs->count;
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if ((len = _GB2312_check(s, n)) < 0)
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return ((size_t)len);
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wc = 0;
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i = len;
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while (i-- > 0)
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wc = (wc << 8) | (unsigned char)*s++;
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if (pwc != NULL)
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*pwc = wc;
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gs->count = 0;
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return (wc == L'\0' ? 0 : len - ocount);
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}
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size_t
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_GB2312_wcrtomb(char * __restrict s, wchar_t wc,
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mbstate_t * __restrict ps __unused)
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{
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if (s == NULL)
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/* Reset to initial shift state (no-op) */
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return (1);
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if (wc & 0x8000) {
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*s++ = (wc >> 8) & 0xff;
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*s = wc & 0xff;
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return (2);
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}
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*s = wc & 0xff;
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return (1);
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}
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