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 * Copyright (c) 2011 The FreeBSD Foundation 10 * All rights reserved. 11 * Portions of this software were developed by David Chisnall 12 * under sponsorship from the FreeBSD Foundation. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * @(#)big5.c 8.1 (Berkeley) 6/4/93 43 * $FreeBSD: head/lib/libc/locale/big5.c 227753 2011-11-20 14:45:42Z theraven $ 44 */ 45 46 47 #include <sys/types.h> 48 #include <errno.h> 49 #include <runetype.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <wchar.h> 53 #include "mblocal.h" 54 55 extern int __mb_sb_limit; 56 57 static size_t _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, 58 size_t, mbstate_t * __restrict); 59 static int _BIG5_mbsinit(const mbstate_t *); 60 static size_t _BIG5_wcrtomb(char * __restrict, wchar_t, 61 mbstate_t * __restrict); 62 63 typedef struct { 64 wchar_t ch; 65 } _BIG5State; 66 67 int 68 _BIG5_init(struct xlocale_ctype *l, _RuneLocale *rl) 69 { 70 71 l->__mbrtowc = _BIG5_mbrtowc; 72 l->__wcrtomb = _BIG5_wcrtomb; 73 l->__mbsinit = _BIG5_mbsinit; 74 l->runes = rl; 75 l->__mb_cur_max = 2; 76 l->__mb_sb_limit = 128; 77 return (0); 78 } 79 80 static int 81 _BIG5_mbsinit(const mbstate_t *ps) 82 { 83 84 return (ps == NULL || ((const _BIG5State *)ps)->ch == 0); 85 } 86 87 static __inline int 88 _big5_check(u_int c) 89 { 90 91 c &= 0xff; 92 return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 93 } 94 95 static size_t 96 _BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 97 mbstate_t * __restrict ps) 98 { 99 _BIG5State *bs; 100 wchar_t wc; 101 size_t len; 102 103 bs = (_BIG5State *)ps; 104 105 if ((bs->ch & ~0xFF) != 0) { 106 /* Bad conversion state. */ 107 errno = EINVAL; 108 return ((size_t)-1); 109 } 110 111 if (s == NULL) { 112 s = ""; 113 n = 1; 114 pwc = NULL; 115 } 116 117 if (n == 0) 118 /* Incomplete multibyte sequence */ 119 return ((size_t)-2); 120 121 if (bs->ch != 0) { 122 if (*s == '\0') { 123 errno = EILSEQ; 124 return ((size_t)-1); 125 } 126 wc = (bs->ch << 8) | (*s & 0xFF); 127 if (pwc != NULL) 128 *pwc = wc; 129 bs->ch = 0; 130 return (1); 131 } 132 133 len = (size_t)_big5_check(*s); 134 wc = *s++ & 0xff; 135 if (len == 2) { 136 if (n < 2) { 137 /* Incomplete multibyte sequence */ 138 bs->ch = wc; 139 return ((size_t)-2); 140 } 141 if (*s == '\0') { 142 errno = EILSEQ; 143 return ((size_t)-1); 144 } 145 wc = (wc << 8) | (*s++ & 0xff); 146 if (pwc != NULL) 147 *pwc = wc; 148 return (2); 149 } else { 150 if (pwc != NULL) 151 *pwc = wc; 152 return (wc == L'\0' ? 0 : 1); 153 } 154 } 155 156 static size_t 157 _BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 158 { 159 _BIG5State *bs; 160 161 bs = (_BIG5State *)ps; 162 163 if (bs->ch != 0) { 164 errno = EINVAL; 165 return ((size_t)-1); 166 } 167 168 if (s == NULL) 169 /* Reset to initial shift state (no-op) */ 170 return (1); 171 if (wc & 0x8000) { 172 *s++ = (wc >> 8) & 0xff; 173 *s = wc & 0xff; 174 return (2); 175 } 176 *s = wc & 0xff; 177 return (1); 178 } 179