1 /*- 2 * Copyright (c) 2004 Tim J. Robbins. All rights reserved. 3 * Copyright (c) 2003 David Xu <davidxu@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/param.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <errno.h> 32 #include <runetype.h> 33 #include <stdlib.h> 34 #include <string.h> 35 #include <wchar.h> 36 #include "mblocal.h" 37 38 extern int __mb_sb_limit; 39 40 static size_t _GB2312_mbrtowc(wchar_t * __restrict, const char * __restrict, 41 size_t, mbstate_t * __restrict); 42 static int _GB2312_mbsinit(const mbstate_t *); 43 static size_t _GB2312_wcrtomb(char * __restrict, wchar_t, 44 mbstate_t * __restrict); 45 46 typedef struct { 47 int count; 48 u_char bytes[2]; 49 } _GB2312State; 50 51 int 52 _GB2312_init(_RuneLocale *rl) 53 { 54 55 _CurrentRuneLocale = rl; 56 __mbrtowc = _GB2312_mbrtowc; 57 __wcrtomb = _GB2312_wcrtomb; 58 __mbsinit = _GB2312_mbsinit; 59 __mb_cur_max = 2; 60 __mb_sb_limit = 128; 61 return (0); 62 } 63 64 static int 65 _GB2312_mbsinit(const mbstate_t *ps) 66 { 67 68 return (ps == NULL || ((const _GB2312State *)ps)->count == 0); 69 } 70 71 static __inline int 72 _GB2312_check(const char *str, size_t n) 73 { 74 const u_char *s = (const u_char *)str; 75 76 if (n == 0) 77 /* Incomplete multibyte sequence */ 78 return (-2); 79 if (s[0] >= 0xa1 && s[0] <= 0xfe) { 80 if (n < 2) 81 /* Incomplete multibyte sequence */ 82 return (-2); 83 if (s[1] < 0xa1 || s[1] > 0xfe) 84 /* Invalid multibyte sequence */ 85 return (-1); 86 return (2); 87 } else if (s[0] & 0x80) { 88 /* Invalid multibyte sequence */ 89 return (-1); 90 } 91 return (1); 92 } 93 94 static size_t 95 _GB2312_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, size_t n, 96 mbstate_t * __restrict ps) 97 { 98 _GB2312State *gs; 99 wchar_t wc; 100 int i, len, ocount; 101 size_t ncopy; 102 103 gs = (_GB2312State *)ps; 104 105 if (gs->count < 0 || gs->count > sizeof(gs->bytes)) { 106 errno = EINVAL; 107 return ((size_t)-1); 108 } 109 110 if (s == NULL) { 111 s = ""; 112 n = 1; 113 pwc = NULL; 114 } 115 116 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count); 117 memcpy(gs->bytes + gs->count, s, ncopy); 118 ocount = gs->count; 119 gs->count += ncopy; 120 s = (char *)gs->bytes; 121 n = gs->count; 122 123 if ((len = _GB2312_check(s, n)) < 0) 124 return ((size_t)len); 125 wc = 0; 126 i = len; 127 while (i-- > 0) 128 wc = (wc << 8) | (unsigned char)*s++; 129 if (pwc != NULL) 130 *pwc = wc; 131 gs->count = 0; 132 return (wc == L'\0' ? 0 : len - ocount); 133 } 134 135 static size_t 136 _GB2312_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 137 { 138 _GB2312State *gs; 139 140 gs = (_GB2312State *)ps; 141 142 if (gs->count != 0) { 143 errno = EINVAL; 144 return ((size_t)-1); 145 } 146 147 if (s == NULL) 148 /* Reset to initial shift state (no-op) */ 149 return (1); 150 if (wc & 0x8000) { 151 *s++ = (wc >> 8) & 0xff; 152 *s = wc & 0xff; 153 return (2); 154 } 155 *s = wc & 0xff; 156 return (1); 157 } 158