1 /*- 2 * Copyright (c) 2002-2004 Tim J. Robbins 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 /* 27 * PRC National Standard GB 18030-2000 encoding of Chinese text. 28 * 29 * See gb18030(5) for details. 30 */ 31 32 #include <sys/param.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <errno.h> 36 #include <runetype.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <wchar.h> 40 #include "mblocal.h" 41 42 extern int __mb_sb_limit; 43 44 static size_t _GB18030_mbrtowc(wchar_t * __restrict, const char * __restrict, 45 size_t, mbstate_t * __restrict); 46 static int _GB18030_mbsinit(const mbstate_t *); 47 static size_t _GB18030_wcrtomb(char * __restrict, wchar_t, 48 mbstate_t * __restrict); 49 50 typedef struct { 51 int count; 52 u_char bytes[4]; 53 } _GB18030State; 54 55 int 56 _GB18030_init(_RuneLocale *rl) 57 { 58 59 __mbrtowc = _GB18030_mbrtowc; 60 __wcrtomb = _GB18030_wcrtomb; 61 __mbsinit = _GB18030_mbsinit; 62 _CurrentRuneLocale = rl; 63 __mb_cur_max = 4; 64 __mb_sb_limit = 128; 65 66 return (0); 67 } 68 69 static int 70 _GB18030_mbsinit(const mbstate_t *ps) 71 { 72 73 return (ps == NULL || ((const _GB18030State *)ps)->count == 0); 74 } 75 76 static size_t 77 _GB18030_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, 78 size_t n, mbstate_t * __restrict ps) 79 { 80 _GB18030State *gs; 81 wchar_t wch; 82 int ch, len, ocount; 83 size_t ncopy; 84 85 gs = (_GB18030State *)ps; 86 87 if (gs->count < 0 || gs->count > sizeof(gs->bytes)) { 88 errno = EINVAL; 89 return ((size_t)-1); 90 } 91 92 if (s == NULL) { 93 s = ""; 94 n = 1; 95 pwc = NULL; 96 } 97 98 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count); 99 memcpy(gs->bytes + gs->count, s, ncopy); 100 ocount = gs->count; 101 gs->count += ncopy; 102 s = (char *)gs->bytes; 103 n = gs->count; 104 105 if (n == 0) 106 /* Incomplete multibyte sequence */ 107 return ((size_t)-2); 108 109 /* 110 * Single byte: [00-7f] 111 * Two byte: [81-fe][40-7e,80-fe] 112 * Four byte: [81-fe][30-39][81-fe][30-39] 113 */ 114 ch = (unsigned char)*s++; 115 if (ch <= 0x7f) { 116 len = 1; 117 wch = ch; 118 } else if (ch >= 0x81 && ch <= 0xfe) { 119 wch = ch; 120 if (n < 2) 121 return ((size_t)-2); 122 ch = (unsigned char)*s++; 123 if ((ch >= 0x40 && ch <= 0x7e) || (ch >= 0x80 && ch <= 0xfe)) { 124 wch = (wch << 8) | ch; 125 len = 2; 126 } else if (ch >= 0x30 && ch <= 0x39) { 127 /* 128 * Strip high bit off the wide character we will 129 * eventually output so that it is positive when 130 * cast to wint_t on 32-bit twos-complement machines. 131 */ 132 wch = ((wch & 0x7f) << 8) | ch; 133 if (n < 3) 134 return ((size_t)-2); 135 ch = (unsigned char)*s++; 136 if (ch < 0x81 || ch > 0xfe) 137 goto ilseq; 138 wch = (wch << 8) | ch; 139 if (n < 4) 140 return ((size_t)-2); 141 ch = (unsigned char)*s++; 142 if (ch < 0x30 || ch > 0x39) 143 goto ilseq; 144 wch = (wch << 8) | ch; 145 len = 4; 146 } else 147 goto ilseq; 148 } else 149 goto ilseq; 150 151 if (pwc != NULL) 152 *pwc = wch; 153 gs->count = 0; 154 return (wch == L'\0' ? 0 : len - ocount); 155 ilseq: 156 errno = EILSEQ; 157 return ((size_t)-1); 158 } 159 160 static size_t 161 _GB18030_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 162 { 163 _GB18030State *gs; 164 size_t len; 165 int c; 166 167 gs = (_GB18030State *)ps; 168 169 if (gs->count != 0) { 170 errno = EINVAL; 171 return ((size_t)-1); 172 } 173 174 if (s == NULL) 175 /* Reset to initial shift state (no-op) */ 176 return (1); 177 if ((wc & ~0x7fffffff) != 0) 178 goto ilseq; 179 if (wc & 0x7f000000) { 180 /* Replace high bit that mbrtowc() removed. */ 181 wc |= 0x80000000; 182 c = (wc >> 24) & 0xff; 183 if (c < 0x81 || c > 0xfe) 184 goto ilseq; 185 *s++ = c; 186 c = (wc >> 16) & 0xff; 187 if (c < 0x30 || c > 0x39) 188 goto ilseq; 189 *s++ = c; 190 c = (wc >> 8) & 0xff; 191 if (c < 0x81 || c > 0xfe) 192 goto ilseq; 193 *s++ = c; 194 c = wc & 0xff; 195 if (c < 0x30 || c > 0x39) 196 goto ilseq; 197 *s++ = c; 198 len = 4; 199 } else if (wc & 0x00ff0000) 200 goto ilseq; 201 else if (wc & 0x0000ff00) { 202 c = (wc >> 8) & 0xff; 203 if (c < 0x81 || c > 0xfe) 204 goto ilseq; 205 *s++ = c; 206 c = wc & 0xff; 207 if (c < 0x40 || c == 0x7f || c == 0xff) 208 goto ilseq; 209 *s++ = c; 210 len = 2; 211 } else if (wc <= 0x7f) { 212 *s++ = wc; 213 len = 1; 214 } else 215 goto ilseq; 216 217 return (len); 218 ilseq: 219 errno = EILSEQ; 220 return ((size_t)-1); 221 } 222