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 static size_t _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, 53 size_t, mbstate_t * __restrict); 54 static int _BIG5_mbsinit(const mbstate_t *); 55 static size_t _BIG5_wcrtomb(char * __restrict, wchar_t, 56 mbstate_t * __restrict); 57 58 typedef struct { 59 wchar_t ch; 60 } _BIG5State; 61 62 int 63 _BIG5_init(_RuneLocale *rl) 64 { 65 66 __mbrtowc = _BIG5_mbrtowc; 67 __wcrtomb = _BIG5_wcrtomb; 68 __mbsinit = _BIG5_mbsinit; 69 _CurrentRuneLocale = rl; 70 __mb_cur_max = 2; 71 return (0); 72 } 73 74 static int 75 _BIG5_mbsinit(const mbstate_t *ps) 76 { 77 78 return (ps == NULL || ((const _BIG5State *)ps)->ch == 0); 79 } 80 81 static __inline int 82 _big5_check(u_int c) 83 { 84 85 c &= 0xff; 86 return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 87 } 88 89 static size_t 90 _BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 91 mbstate_t * __restrict ps) 92 { 93 _BIG5State *bs; 94 wchar_t wc; 95 size_t len; 96 97 bs = (_BIG5State *)ps; 98 99 if ((bs->ch & ~0xFF) != 0) { 100 /* Bad conversion state. */ 101 errno = EINVAL; 102 return ((size_t)-1); 103 } 104 105 if (s == NULL) { 106 s = ""; 107 n = 1; 108 pwc = NULL; 109 } 110 111 if (n == 0) 112 /* Incomplete multibyte sequence */ 113 return ((size_t)-2); 114 115 if (bs->ch != 0) { 116 if (*s == '\0') { 117 errno = EILSEQ; 118 return ((size_t)-1); 119 } 120 wc = (bs->ch << 8) | (*s & 0xFF); 121 if (pwc != NULL) 122 *pwc = wc; 123 bs->ch = 0; 124 return (1); 125 } 126 127 len = (size_t)_big5_check(*s); 128 wc = *s++ & 0xff; 129 if (len == 2) { 130 if (n < 2) { 131 /* Incomplete multibyte sequence */ 132 bs->ch = wc; 133 return ((size_t)-2); 134 } 135 if (*s == '\0') { 136 errno = EILSEQ; 137 return ((size_t)-1); 138 } 139 wc = (wc << 8) | (*s++ & 0xff); 140 if (pwc != NULL) 141 *pwc = wc; 142 return (2); 143 } else { 144 if (pwc != NULL) 145 *pwc = wc; 146 return (wc == L'\0' ? 0 : 1); 147 } 148 } 149 150 static size_t 151 _BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 152 { 153 _BIG5State *bs; 154 155 bs = (_BIG5State *)ps; 156 157 if (bs->ch != 0) { 158 errno = EINVAL; 159 return ((size_t)-1); 160 } 161 162 if (s == NULL) 163 /* Reset to initial shift state (no-op) */ 164 return (1); 165 if (wc & 0x8000) { 166 *s++ = (wc >> 8) & 0xff; 167 *s = wc & 0xff; 168 return (2); 169 } 170 *s = wc & 0xff; 171 return (1); 172 } 173