big5.c revision 142654
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 */ 41142654Sphantom#include <sys/cdefs.h> 4292986Sobrien__FBSDID("$FreeBSD: head/lib/libc/locale/big5.c 142654 2005-02-27 15:11:09Z phantom $"); 4338333Sphk 44142654Sphantom#include <sys/types.h> 45128155Stjr#include <errno.h> 46121893Stjr#include <runetype.h> 4738333Sphk#include <stdlib.h> 48128004Stjr#include <string.h> 49121893Stjr#include <wchar.h> 50129153Stjr#include "mblocal.h" 5138333Sphk 52142654Sphantomstatic size_t _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, 53142654Sphantom size_t, mbstate_t * __restrict); 54142654Sphantomstatic int _BIG5_mbsinit(const mbstate_t *); 55142654Sphantomstatic size_t _BIG5_wcrtomb(char * __restrict, wchar_t, 56142654Sphantom mbstate_t * __restrict); 57121893Stjr 58128004Stjrtypedef struct { 59129334Stjr wchar_t ch; 60128004Stjr} _BIG5State; 61128004Stjr 6238333Sphkint 63121893Stjr_BIG5_init(_RuneLocale *rl) 6438333Sphk{ 65121893Stjr 66121893Stjr __mbrtowc = _BIG5_mbrtowc; 67121893Stjr __wcrtomb = _BIG5_wcrtomb; 68128004Stjr __mbsinit = _BIG5_mbsinit; 6938333Sphk _CurrentRuneLocale = rl; 7038333Sphk __mb_cur_max = 2; 7138333Sphk return (0); 7238333Sphk} 7338333Sphk 74142654Sphantomstatic int 75128004Stjr_BIG5_mbsinit(const mbstate_t *ps) 76128004Stjr{ 77128004Stjr 78129334Stjr return (ps == NULL || ((const _BIG5State *)ps)->ch == 0); 79128004Stjr} 80128004Stjr 81121893Stjrstatic __inline int 82121893Stjr_big5_check(u_int c) 8338333Sphk{ 84121893Stjr 8538333Sphk c &= 0xff; 8638333Sphk return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 8738333Sphk} 8838333Sphk 89142654Sphantomstatic size_t 90121893Stjr_BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 91128004Stjr mbstate_t * __restrict ps) 9238333Sphk{ 93128004Stjr _BIG5State *bs; 94121893Stjr wchar_t wc; 95129334Stjr size_t len; 9638333Sphk 97128004Stjr bs = (_BIG5State *)ps; 98128004Stjr 99129334Stjr if ((bs->ch & ~0xFF) != 0) { 100129334Stjr /* Bad conversion state. */ 101128155Stjr errno = EINVAL; 102128155Stjr return ((size_t)-1); 103128155Stjr } 104128155Stjr 105128004Stjr if (s == NULL) { 106128004Stjr s = ""; 107128004Stjr n = 1; 108128004Stjr pwc = NULL; 109128004Stjr } 110128004Stjr 111129334Stjr if (n == 0) 112121893Stjr /* Incomplete multibyte sequence */ 113121893Stjr return ((size_t)-2); 114129334Stjr 115129334Stjr if (bs->ch != 0) { 116129334Stjr if (*s == '\0') { 117129334Stjr errno = EILSEQ; 118129334Stjr return ((size_t)-1); 119129334Stjr } 120129334Stjr wc = (bs->ch << 8) | (*s & 0xFF); 121129334Stjr if (pwc != NULL) 122129334Stjr *pwc = wc; 123129334Stjr bs->ch = 0; 124129334Stjr return (1); 125129117Stjr } 126129334Stjr 127129334Stjr len = (size_t)_big5_check(*s); 128129334Stjr wc = *s++ & 0xff; 129129334Stjr if (len == 2) { 130129334Stjr if (n < 2) { 131129334Stjr /* Incomplete multibyte sequence */ 132129334Stjr bs->ch = wc; 133129334Stjr return ((size_t)-2); 134129334Stjr } 135129334Stjr if (*s == '\0') { 136129334Stjr errno = EILSEQ; 137129334Stjr return ((size_t)-1); 138129334Stjr } 139129334Stjr wc = (wc << 8) | (*s++ & 0xff); 140129334Stjr if (pwc != NULL) 141129334Stjr *pwc = wc; 142129334Stjr return (2); 143129334Stjr } else { 144129334Stjr if (pwc != NULL) 145129334Stjr *pwc = wc; 146129334Stjr return (wc == L'\0' ? 0 : 1); 147129334Stjr } 14838333Sphk} 14938333Sphk 150142654Sphantomstatic size_t 151128155Stjr_BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 15238333Sphk{ 153128155Stjr _BIG5State *bs; 154121893Stjr 155128155Stjr bs = (_BIG5State *)ps; 156128155Stjr 157129334Stjr if (bs->ch != 0) { 158128155Stjr errno = EINVAL; 159128155Stjr return ((size_t)-1); 160128155Stjr } 161128155Stjr 162121893Stjr if (s == NULL) 163121893Stjr /* Reset to initial shift state (no-op) */ 164121893Stjr return (1); 165121893Stjr if (wc & 0x8000) { 166121893Stjr *s++ = (wc >> 8) & 0xff; 167121893Stjr *s = wc & 0xff; 168121893Stjr return (2); 16938333Sphk } 170121893Stjr *s = wc & 0xff; 171121893Stjr return (1); 17238333Sphk} 173