big5.c revision 128004
138333Sphk/*- 2128004Stjr * Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved. 338333Sphk * Copyright (c) 1993 438333Sphk * The Regents of the University of California. All rights reserved. 538333Sphk * 638333Sphk * This code is derived from software contributed to Berkeley by 738333Sphk * Paul Borman at Krystal Technologies. 838333Sphk * 938333Sphk * Redistribution and use in source and binary forms, with or without 1038333Sphk * modification, are permitted provided that the following conditions 1138333Sphk * are met: 1238333Sphk * 1. Redistributions of source code must retain the above copyright 1338333Sphk * notice, this list of conditions and the following disclaimer. 1438333Sphk * 2. Redistributions in binary form must reproduce the above copyright 1538333Sphk * notice, this list of conditions and the following disclaimer in the 1638333Sphk * documentation and/or other materials provided with the distribution. 1738333Sphk * 3. All advertising materials mentioning features or use of this software 1838333Sphk * must display the following acknowledgement: 1938333Sphk * This product includes software developed by the University of 2038333Sphk * California, Berkeley and its contributors. 2138333Sphk * 4. Neither the name of the University nor the names of its contributors 2238333Sphk * may be used to endorse or promote products derived from this software 2338333Sphk * without specific prior written permission. 2438333Sphk * 2538333Sphk * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2638333Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2738333Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2838333Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2938333Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3038333Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3138333Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3238333Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3338333Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3438333Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3538333Sphk * SUCH DAMAGE. 3638333Sphk */ 3738333Sphk 3838333Sphk#if defined(LIBC_SCCS) && !defined(lint) 3938333Sphkstatic char sccsid[] = "@(#)big5.c 8.1 (Berkeley) 6/4/93"; 4038333Sphk#endif /* LIBC_SCCS and not lint */ 41128004Stjr#include <sys/param.h> 4292986Sobrien__FBSDID("$FreeBSD: head/lib/libc/locale/big5.c 128004 2004-04-07 10:48:19Z tjr $"); 4338333Sphk 44121893Stjr#include <runetype.h> 4538333Sphk#include <stdlib.h> 46128004Stjr#include <string.h> 47121893Stjr#include <wchar.h> 4838333Sphk 49121893Stjrextern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict, 50121893Stjr size_t, mbstate_t * __restrict); 51128004Stjrextern int (*__mbsinit)(const mbstate_t *); 52121893Stjrextern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict); 5338333Sphk 54121893Stjrint _BIG5_init(_RuneLocale *); 55121893Stjrsize_t _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t, 56121893Stjr mbstate_t * __restrict); 57128004Stjrint _BIG5_mbsinit(const mbstate_t *); 58121893Stjrsize_t _BIG5_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict); 59121893Stjr 60128004Stjrtypedef struct { 61128004Stjr int count; 62128004Stjr u_char bytes[2]; 63128004Stjr} _BIG5State; 64128004Stjr 6538333Sphkint 66121893Stjr_BIG5_init(_RuneLocale *rl) 6738333Sphk{ 68121893Stjr 69121893Stjr __mbrtowc = _BIG5_mbrtowc; 70121893Stjr __wcrtomb = _BIG5_wcrtomb; 71128004Stjr __mbsinit = _BIG5_mbsinit; 7238333Sphk _CurrentRuneLocale = rl; 7338333Sphk __mb_cur_max = 2; 7438333Sphk return (0); 7538333Sphk} 7638333Sphk 77128004Stjrint 78128004Stjr_BIG5_mbsinit(const mbstate_t *ps) 79128004Stjr{ 80128004Stjr 81128004Stjr return (ps == NULL || ((_BIG5State *)ps)->count == 0); 82128004Stjr} 83128004Stjr 84121893Stjrstatic __inline int 85121893Stjr_big5_check(u_int c) 8638333Sphk{ 87121893Stjr 8838333Sphk c &= 0xff; 8938333Sphk return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 9038333Sphk} 9138333Sphk 92121893Stjrsize_t 93121893Stjr_BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 94128004Stjr mbstate_t * __restrict ps) 9538333Sphk{ 96128004Stjr _BIG5State *bs; 97121893Stjr wchar_t wc; 98128004Stjr int i, len, ocount; 99128004Stjr size_t ncopy; 10038333Sphk 101128004Stjr bs = (_BIG5State *)ps; 102128004Stjr 103128004Stjr if (s == NULL) { 104128004Stjr s = ""; 105128004Stjr n = 1; 106128004Stjr pwc = NULL; 107128004Stjr } 108128004Stjr 109128004Stjr ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(bs->bytes) - bs->count); 110128004Stjr memcpy(bs->bytes + bs->count, s, ncopy); 111128004Stjr ocount = bs->count; 112128004Stjr bs->count += ncopy; 113128004Stjr s = (char *)bs->bytes; 114128004Stjr n = bs->count; 115128004Stjr 116121893Stjr if (n == 0 || (size_t)(len = _big5_check(*s)) > n) 117121893Stjr /* Incomplete multibyte sequence */ 118121893Stjr return ((size_t)-2); 119121893Stjr wc = 0; 120121893Stjr i = len; 121121893Stjr while (i-- > 0) 122121893Stjr wc = (wc << 8) | (unsigned char)*s++; 123121893Stjr if (pwc != NULL) 124121893Stjr *pwc = wc; 125128004Stjr bs->count = 0; 126128004Stjr return (wc == L'\0' ? 0 : len - ocount); 12738333Sphk} 12838333Sphk 129121893Stjrsize_t 130121893Stjr_BIG5_wcrtomb(char * __restrict s, wchar_t wc, 131121893Stjr mbstate_t * __restrict ps __unused) 13238333Sphk{ 133121893Stjr 134121893Stjr if (s == NULL) 135121893Stjr /* Reset to initial shift state (no-op) */ 136121893Stjr return (1); 137121893Stjr if (wc & 0x8000) { 138121893Stjr *s++ = (wc >> 8) & 0xff; 139121893Stjr *s = wc & 0xff; 140121893Stjr return (2); 14138333Sphk } 142121893Stjr *s = wc & 0xff; 143121893Stjr return (1); 14438333Sphk} 145