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 50 extern size_t (*__mbrtowc)(wchar_t * __restrict, const char * __restrict, 51 size_t, mbstate_t * __restrict); 52 extern int (*__mbsinit)(const mbstate_t *); 53 extern size_t (*__wcrtomb)(char * __restrict, wchar_t, mbstate_t * __restrict); 54 55 int _BIG5_init(_RuneLocale *); 56 size_t _BIG5_mbrtowc(wchar_t * __restrict, const char * __restrict, size_t, 57 mbstate_t * __restrict); 58 int _BIG5_mbsinit(const mbstate_t *); 59 size_t _BIG5_wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict); 60 61 typedef struct { 62 int count; 63 u_char bytes[2]; 64 } _BIG5State; 65 66 int 67 _BIG5_init(_RuneLocale *rl) 68 { 69 70 __mbrtowc = _BIG5_mbrtowc; 71 __wcrtomb = _BIG5_wcrtomb; 72 __mbsinit = _BIG5_mbsinit; 73 _CurrentRuneLocale = rl; 74 __mb_cur_max = 2; 75 return (0); 76 } 77 78 int 79 _BIG5_mbsinit(const mbstate_t *ps) 80 { 81 82 return (ps == NULL || ((const _BIG5State *)ps)->count == 0); 83 } 84 85 static __inline int 86 _big5_check(u_int c) 87 { 88 89 c &= 0xff; 90 return ((c >= 0xa1 && c <= 0xfe) ? 2 : 1); 91 } 92 93 size_t 94 _BIG5_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 95 mbstate_t * __restrict ps) 96 { 97 _BIG5State *bs; 98 wchar_t wc; 99 int i, len, ocount; 100 size_t ncopy; 101 102 bs = (_BIG5State *)ps; 103 104 if (bs->count < 0 || bs->count > sizeof(bs->bytes)) { 105 errno = EINVAL; 106 return ((size_t)-1); 107 } 108 109 if (s == NULL) { 110 s = ""; 111 n = 1; 112 pwc = NULL; 113 } 114 115 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(bs->bytes) - bs->count); 116 memcpy(bs->bytes + bs->count, s, ncopy); 117 ocount = bs->count; 118 bs->count += ncopy; 119 s = (char *)bs->bytes; 120 n = bs->count; 121 122 if (n == 0 || (size_t)(len = _big5_check(*s)) > n) 123 /* Incomplete multibyte sequence */ 124 return ((size_t)-2); 125 if (n == 2 && s[1] == '\0') { 126 errno = EILSEQ; 127 return ((size_t)-1); 128 } 129 wc = 0; 130 i = len; 131 while (i-- > 0) 132 wc = (wc << 8) | (unsigned char)*s++; 133 if (pwc != NULL) 134 *pwc = wc; 135 bs->count = 0; 136 return (wc == L'\0' ? 0 : len - ocount); 137 } 138 139 size_t 140 _BIG5_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 141 { 142 _BIG5State *bs; 143 144 bs = (_BIG5State *)ps; 145 146 if (bs->count != 0) { 147 errno = EINVAL; 148 return ((size_t)-1); 149 } 150 151 if (s == NULL) 152 /* Reset to initial shift state (no-op) */ 153 return (1); 154 if (wc & 0x8000) { 155 *s++ = (wc >> 8) & 0xff; 156 *s = wc & 0xff; 157 return (2); 158 } 159 *s = wc & 0xff; 160 return (1); 161 } 162