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) 39 static char sccsid[] = "@(#)big5.c 8.1 (Berkeley) 6/4/93"; 40 #endif /* LIBC_SCCS and not lint */ 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/types.h> 45 #include <errno.h> 46 #include <runetype.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <wchar.h> 50 #include "mblocal.h" 51 52 extern int __mb_sb_limit; 53 54 static size_t _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, 55 size_t, mbstate_t * __restrict); 56 static int _BIG5_mbsinit(const mbstate_t *); 57 static size_t _BIG5_wcrtomb(char * __restrict, wchar_t, 58 mbstate_t * __restrict); 59 60 typedef struct { 61 wchar_t ch; 62 } _BIG5State; 63 64 int 65 _BIG5_init(_RuneLocale *rl) 66 { 67 68 __mbrtowc = _BIG5_mbrtowc; 69 __wcrtomb = _BIG5_wcrtomb; 70 __mbsinit = _BIG5_mbsinit; 71 _CurrentRuneLocale = rl; 72 __mb_cur_max = 2; 73 __mb_sb_limit = 128; 74 return (0); 75 } 76 77 static int 78 _BIG5_mbsinit(const mbstate_t *ps) 79 { 80 81 return (ps == NULL || ((const _BIG5State *)ps)->ch == 0); 82 } 83 84 static __inline int 85 _big5_check(u_int c) 86 { 87 88 c &= 0xff; 89 return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 90 } 91 92 static size_t 93 _BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 94 mbstate_t * __restrict ps) 95 { 96 _BIG5State *bs; 97 wchar_t wc; 98 size_t len; 99 100 bs = (_BIG5State *)ps; 101 102 if ((bs->ch & ~0xFF) != 0) { 103 /* Bad conversion state. */ 104 errno = EINVAL; 105 return ((size_t)-1); 106 } 107 108 if (s == NULL) { 109 s = ""; 110 n = 1; 111 pwc = NULL; 112 } 113 114 if (n == 0) 115 /* Incomplete multibyte sequence */ 116 return ((size_t)-2); 117 118 if (bs->ch != 0) { 119 if (*s == '\0') { 120 errno = EILSEQ; 121 return ((size_t)-1); 122 } 123 wc = (bs->ch << 8) | (*s & 0xFF); 124 if (pwc != NULL) 125 *pwc = wc; 126 bs->ch = 0; 127 return (1); 128 } 129 130 len = (size_t)_big5_check(*s); 131 wc = *s++ & 0xff; 132 if (len == 2) { 133 if (n < 2) { 134 /* Incomplete multibyte sequence */ 135 bs->ch = wc; 136 return ((size_t)-2); 137 } 138 if (*s == '\0') { 139 errno = EILSEQ; 140 return ((size_t)-1); 141 } 142 wc = (wc << 8) | (*s++ & 0xff); 143 if (pwc != NULL) 144 *pwc = wc; 145 return (2); 146 } else { 147 if (pwc != NULL) 148 *pwc = wc; 149 return (wc == L'\0' ? 0 : 1); 150 } 151 } 152 153 static size_t 154 _BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 155 { 156 _BIG5State *bs; 157 158 bs = (_BIG5State *)ps; 159 160 if (bs->ch != 0) { 161 errno = EINVAL; 162 return ((size_t)-1); 163 } 164 165 if (s == NULL) 166 /* Reset to initial shift state (no-op) */ 167 return (1); 168 if (wc & 0x8000) { 169 *s++ = (wc >> 8) & 0xff; 170 *s = wc & 0xff; 171 return (2); 172 } 173 *s = wc & 0xff; 174 return (1); 175 } 176