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 43 #if defined(LIBC_SCCS) && !defined(lint) 44 static char sccsid[] = "@(#)big5.c 8.1 (Berkeley) 6/4/93"; 45 #endif /* LIBC_SCCS and not lint */ 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/types.h> 50 #include <errno.h> 51 #include <runetype.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <wchar.h> 55 #include "mblocal.h" 56 57 extern int __mb_sb_limit; 58 59 static size_t _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, 60 size_t, mbstate_t * __restrict); 61 static int _BIG5_mbsinit(const mbstate_t *); 62 static size_t _BIG5_wcrtomb(char * __restrict, wchar_t, 63 mbstate_t * __restrict); 64 65 typedef struct { 66 wchar_t ch; 67 } _BIG5State; 68 69 int 70 _BIG5_init(struct xlocale_ctype *l, _RuneLocale *rl) 71 { 72 73 l->__mbrtowc = _BIG5_mbrtowc; 74 l->__wcrtomb = _BIG5_wcrtomb; 75 l->__mbsinit = _BIG5_mbsinit; 76 l->runes = rl; 77 l->__mb_cur_max = 2; 78 l->__mb_sb_limit = 128; 79 return (0); 80 } 81 82 static int 83 _BIG5_mbsinit(const mbstate_t *ps) 84 { 85 86 return (ps == NULL || ((const _BIG5State *)ps)->ch == 0); 87 } 88 89 static __inline int 90 _big5_check(u_int c) 91 { 92 93 c &= 0xff; 94 return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 95 } 96 97 static size_t 98 _BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 99 mbstate_t * __restrict ps) 100 { 101 _BIG5State *bs; 102 wchar_t wc; 103 size_t len; 104 105 bs = (_BIG5State *)ps; 106 107 if ((bs->ch & ~0xFF) != 0) { 108 /* Bad conversion state. */ 109 errno = EINVAL; 110 return ((size_t)-1); 111 } 112 113 if (s == NULL) { 114 s = ""; 115 n = 1; 116 pwc = NULL; 117 } 118 119 if (n == 0) 120 /* Incomplete multibyte sequence */ 121 return ((size_t)-2); 122 123 if (bs->ch != 0) { 124 if (*s == '\0') { 125 errno = EILSEQ; 126 return ((size_t)-1); 127 } 128 wc = (bs->ch << 8) | (*s & 0xFF); 129 if (pwc != NULL) 130 *pwc = wc; 131 bs->ch = 0; 132 return (1); 133 } 134 135 len = (size_t)_big5_check(*s); 136 wc = *s++ & 0xff; 137 if (len == 2) { 138 if (n < 2) { 139 /* Incomplete multibyte sequence */ 140 bs->ch = wc; 141 return ((size_t)-2); 142 } 143 if (*s == '\0') { 144 errno = EILSEQ; 145 return ((size_t)-1); 146 } 147 wc = (wc << 8) | (*s++ & 0xff); 148 if (pwc != NULL) 149 *pwc = wc; 150 return (2); 151 } else { 152 if (pwc != NULL) 153 *pwc = wc; 154 return (wc == L'\0' ? 0 : 1); 155 } 156 } 157 158 static size_t 159 _BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 160 { 161 _BIG5State *bs; 162 163 bs = (_BIG5State *)ps; 164 165 if (bs->ch != 0) { 166 errno = EINVAL; 167 return ((size_t)-1); 168 } 169 170 if (s == NULL) 171 /* Reset to initial shift state (no-op) */ 172 return (1); 173 if (wc & 0x8000) { 174 *s++ = (wc >> 8) & 0xff; 175 *s = wc & 0xff; 176 return (2); 177 } 178 *s = wc & 0xff; 179 return (1); 180 } 181