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/param.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <errno.h> 45 #include <runetype.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <wchar.h> 49 #include "mblocal.h" 50 51 int _BIG5_init(_RuneLocale *); 52 size_t _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t, 53 mbstate_t * __restrict); 54 int _BIG5_mbsinit(const mbstate_t *); 55 size_t _BIG5_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict); 56 57 typedef struct { 58 wchar_t ch; 59 } _BIG5State; 60 61 int 62 _BIG5_init(_RuneLocale *rl) 63 { 64 65 __mbrtowc = _BIG5_mbrtowc; 66 __wcrtomb = _BIG5_wcrtomb; 67 __mbsinit = _BIG5_mbsinit; 68 _CurrentRuneLocale = rl; 69 __mb_cur_max = 2; 70 return (0); 71 } 72 73 int 74 _BIG5_mbsinit(const mbstate_t *ps) 75 { 76 77 return (ps == NULL || ((const _BIG5State *)ps)->ch == 0); 78 } 79 80 static __inline int 81 _big5_check(u_int c) 82 { 83 84 c &= 0xff; 85 return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 86 } 87 88 size_t 89 _BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 90 mbstate_t * __restrict ps) 91 { 92 _BIG5State *bs; 93 wchar_t wc; 94 size_t len; 95 96 bs = (_BIG5State *)ps; 97 98 if ((bs->ch & ~0xFF) != 0) { 99 /* Bad conversion state. */ 100 errno = EINVAL; 101 return ((size_t)-1); 102 } 103 104 if (s == NULL) { 105 s = ""; 106 n = 1; 107 pwc = NULL; 108 } 109 110 if (n == 0) 111 /* Incomplete multibyte sequence */ 112 return ((size_t)-2); 113 114 if (bs->ch != 0) { 115 if (*s == '\0') { 116 errno = EILSEQ; 117 return ((size_t)-1); 118 } 119 wc = (bs->ch << 8) | (*s & 0xFF); 120 if (pwc != NULL) 121 *pwc = wc; 122 bs->ch = 0; 123 return (1); 124 } 125 126 len = (size_t)_big5_check(*s); 127 wc = *s++ & 0xff; 128 if (len == 2) { 129 if (n < 2) { 130 /* Incomplete multibyte sequence */ 131 bs->ch = wc; 132 return ((size_t)-2); 133 } 134 if (*s == '\0') { 135 errno = EILSEQ; 136 return ((size_t)-1); 137 } 138 wc = (wc << 8) | (*s++ & 0xff); 139 if (pwc != NULL) 140 *pwc = wc; 141 return (2); 142 } else { 143 if (pwc != NULL) 144 *pwc = wc; 145 return (wc == L'\0' ? 0 : 1); 146 } 147 } 148 149 size_t 150 _BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 151 { 152 _BIG5State *bs; 153 154 bs = (_BIG5State *)ps; 155 156 if (bs->ch != 0) { 157 errno = EINVAL; 158 return ((size_t)-1); 159 } 160 161 if (s == NULL) 162 /* Reset to initial shift state (no-op) */ 163 return (1); 164 if (wc & 0x8000) { 165 *s++ = (wc >> 8) & 0xff; 166 *s = wc & 0xff; 167 return (2); 168 } 169 *s = wc & 0xff; 170 return (1); 171 } 172