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 static size_t _GB18030_mbrtowc(wchar_t * __restrict, const char * __restrict, 43 size_t, mbstate_t * __restrict); 44 static int _GB18030_mbsinit(const mbstate_t *); 45 static size_t _GB18030_wcrtomb(char * __restrict, wchar_t, 46 mbstate_t * __restrict); 47 48 typedef struct { 49 int count; 50 u_char bytes[4]; 51 } _GB18030State; 52 53 int 54 _GB18030_init(_RuneLocale *rl) 55 { 56 57 __mbrtowc = _GB18030_mbrtowc; 58 __wcrtomb = _GB18030_wcrtomb; 59 __mbsinit = _GB18030_mbsinit; 60 _CurrentRuneLocale = rl; 61 __mb_cur_max = 4; 62 63 return (0); 64 } 65 66 static int 67 _GB18030_mbsinit(const mbstate_t *ps) 68 { 69 70 return (ps == NULL || ((const _GB18030State *)ps)->count == 0); 71 } 72 73 static size_t 74 _GB18030_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, 75 size_t n, mbstate_t * __restrict ps) 76 { 77 _GB18030State *gs; 78 wchar_t wch; 79 int ch, len, ocount; 80 size_t ncopy; 81 82 gs = (_GB18030State *)ps; 83 84 if (gs->count < 0 || gs->count > sizeof(gs->bytes)) { 85 errno = EINVAL; 86 return ((size_t)-1); 87 } 88 89 if (s == NULL) { 90 s = ""; 91 n = 1; 92 pwc = NULL; 93 } 94 95 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count); 96 memcpy(gs->bytes + gs->count, s, ncopy); 97 ocount = gs->count; 98 gs->count += ncopy; 99 s = (char *)gs->bytes; 100 n = gs->count; 101 102 if (n == 0) 103 /* Incomplete multibyte sequence */ 104 return ((size_t)-2); 105 106 /* 107 * Single byte: [00-7f] 108 * Two byte: [81-fe][40-7e,80-fe] 109 * Four byte: [81-fe][30-39][81-fe][30-39] 110 */ 111 ch = (unsigned char)*s++; 112 if (ch <= 0x7f) { 113 len = 1; 114 wch = ch; 115 } else if (ch >= 0x81 && ch <= 0xfe) { 116 wch = ch; 117 if (n < 2) 118 return ((size_t)-2); 119 ch = (unsigned char)*s++; 120 if ((ch >= 0x40 && ch <= 0x7e) || (ch >= 0x80 && ch <= 0xfe)) { 121 wch = (wch << 8) | ch; 122 len = 2; 123 } else if (ch >= 0x30 && ch <= 0x39) { 124 /* 125 * Strip high bit off the wide character we will 126 * eventually output so that it is positive when 127 * cast to wint_t on 32-bit twos-complement machines. 128 */ 129 wch = ((wch & 0x7f) << 8) | ch; 130 if (n < 3) 131 return ((size_t)-2); 132 ch = (unsigned char)*s++; 133 if (ch < 0x81 || ch > 0xfe) 134 goto ilseq; 135 wch = (wch << 8) | ch; 136 if (n < 4) 137 return ((size_t)-2); 138 ch = (unsigned char)*s++; 139 if (ch < 0x30 || ch > 0x39) 140 goto ilseq; 141 wch = (wch << 8) | ch; 142 len = 4; 143 } else 144 goto ilseq; 145 } else 146 goto ilseq; 147 148 if (pwc != NULL) 149 *pwc = wch; 150 gs->count = 0; 151 return (wch == L'\0' ? 0 : len - ocount); 152 ilseq: 153 errno = EILSEQ; 154 return ((size_t)-1); 155 } 156 157 static size_t 158 _GB18030_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 159 { 160 _GB18030State *gs; 161 size_t len; 162 int c; 163 164 gs = (_GB18030State *)ps; 165 166 if (gs->count != 0) { 167 errno = EINVAL; 168 return ((size_t)-1); 169 } 170 171 if (s == NULL) 172 /* Reset to initial shift state (no-op) */ 173 return (1); 174 if ((wc & ~0x7fffffff) != 0) 175 goto ilseq; 176 if (wc & 0x7f000000) { 177 /* Replace high bit that mbrtowc() removed. */ 178 wc |= 0x80000000; 179 c = (wc >> 24) & 0xff; 180 if (c < 0x81 || c > 0xfe) 181 goto ilseq; 182 *s++ = c; 183 c = (wc >> 16) & 0xff; 184 if (c < 0x30 || c > 0x39) 185 goto ilseq; 186 *s++ = c; 187 c = (wc >> 8) & 0xff; 188 if (c < 0x81 || c > 0xfe) 189 goto ilseq; 190 *s++ = c; 191 c = wc & 0xff; 192 if (c < 0x30 || c > 0x39) 193 goto ilseq; 194 *s++ = c; 195 len = 4; 196 } else if (wc & 0x00ff0000) 197 goto ilseq; 198 else if (wc & 0x0000ff00) { 199 c = (wc >> 8) & 0xff; 200 if (c < 0x81 || c > 0xfe) 201 goto ilseq; 202 *s++ = c; 203 c = wc & 0xff; 204 if (c < 0x40 || c == 0x7f || c == 0xff) 205 goto ilseq; 206 *s++ = c; 207 len = 2; 208 } else if (wc <= 0x7f) { 209 *s++ = wc; 210 len = 1; 211 } else 212 goto ilseq; 213 214 return (len); 215 ilseq: 216 errno = EILSEQ; 217 return ((size_t)-1); 218 } 219