1/*- 2 * Copyright (c) 2002-2004 Tim J. Robbins. All rights reserved. 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Paul Borman at Krystal Technologies. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38#if defined(LIBC_SCCS) && !defined(lint) 39static char sccsid[] = "@(#)big5.c 8.1 (Berkeley) 6/4/93"; 40#endif /* LIBC_SCCS and not lint */ 41#include <sys/cdefs.h> 42__FBSDID("$FreeBSD: src/lib/libc/locale/big5.c,v 1.18 2007/10/13 16:28:21 ache Exp $"); 43 44#include "xlocale_private.h" 45 46#include <sys/types.h> 47#include <errno.h> 48#include <runetype.h> 49#include <stdlib.h> 50#include <string.h> 51#include <wchar.h> 52#include "mblocal.h" 53 54static size_t _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, 55 size_t, mbstate_t * __restrict, locale_t); 56static int _BIG5_mbsinit(const mbstate_t *, locale_t); 57static size_t _BIG5_wcrtomb(char * __restrict, wchar_t, 58 mbstate_t * __restrict, locale_t); 59 60typedef struct { 61 wchar_t ch; 62} _BIG5State; 63 64int 65_BIG5_init(struct __xlocale_st_runelocale *xrl) 66{ 67 68 xrl->__mbrtowc = _BIG5_mbrtowc; 69 xrl->__wcrtomb = _BIG5_wcrtomb; 70 xrl->__mbsinit = _BIG5_mbsinit; 71 xrl->__mb_cur_max = 2; 72 xrl->__mb_sb_limit = 128; 73 return (0); 74} 75 76static int 77_BIG5_mbsinit(const mbstate_t *ps, locale_t loc __unused) 78{ 79 80 return (ps == NULL || ((const _BIG5State *)ps)->ch == 0); 81} 82 83static __inline int 84_big5_check(u_int c) 85{ 86 87 c &= 0xff; 88 return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 89} 90 91static size_t 92_BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 93 mbstate_t * __restrict ps, locale_t loc __unused) 94{ 95 _BIG5State *bs; 96 wchar_t wc; 97 size_t len; 98 99 bs = (_BIG5State *)ps; 100 101 if ((bs->ch & ~0xFF) != 0) { 102 /* Bad conversion state. */ 103 errno = EINVAL; 104 return ((size_t)-1); 105 } 106 107 if (s == NULL) { 108 s = ""; 109 n = 1; 110 pwc = NULL; 111 } 112 113 if (n == 0) 114 /* Incomplete multibyte sequence */ 115 return ((size_t)-2); 116 117 if (bs->ch != 0) { 118 if (*s == '\0') { 119 errno = EILSEQ; 120 return ((size_t)-1); 121 } 122 wc = (bs->ch << 8) | (*s & 0xFF); 123 if (pwc != NULL) 124 *pwc = wc; 125 bs->ch = 0; 126 return (1); 127 } 128 129 len = (size_t)_big5_check(*s); 130 wc = *s++ & 0xff; 131 if (len == 2) { 132 if (n < 2) { 133 /* Incomplete multibyte sequence */ 134 bs->ch = wc; 135 return ((size_t)-2); 136 } 137 if (*s == '\0') { 138 errno = EILSEQ; 139 return ((size_t)-1); 140 } 141 wc = (wc << 8) | (*s++ & 0xff); 142 if (pwc != NULL) 143 *pwc = wc; 144 return (2); 145 } else { 146 if (pwc != NULL) 147 *pwc = wc; 148 return (wc == L'\0' ? 0 : 1); 149 } 150} 151 152static size_t 153_BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps, locale_t loc __unused) 154{ 155 _BIG5State *bs; 156 157 bs = (_BIG5State *)ps; 158 159 if (bs->ch != 0) { 160 errno = EINVAL; 161 return ((size_t)-1); 162 } 163 164 if (s == NULL) 165 /* Reset to initial shift state (no-op) */ 166 return (1); 167 if (wc & 0x8000) { 168 *s++ = (wc >> 8) & 0xff; 169 *s = wc & 0xff; 170 return (2); 171 } 172 *s = wc & 0xff; 173 return (1); 174} 175