1 /*- 2 * Copyright (c) 2002-2004 Tim J. Robbins 3 * All rights reserved. 4 * 5 * Copyright (c) 2011 The FreeBSD Foundation 6 * All rights reserved. 7 * Portions of this software were developed by David Chisnall 8 * under sponsorship from the FreeBSD Foundation. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 /* 32 * PRC National Standard GB 18030-2000 encoding of Chinese text. 33 * 34 * See gb18030(5) for details. 35 */ 36 37 #include <sys/param.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <errno.h> 41 #include <runetype.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <wchar.h> 45 #include "mblocal.h" 46 47 static size_t _GB18030_mbrtowc(wchar_t * __restrict, const char * __restrict, 48 size_t, mbstate_t * __restrict); 49 static int _GB18030_mbsinit(const mbstate_t *); 50 static size_t _GB18030_wcrtomb(char * __restrict, wchar_t, 51 mbstate_t * __restrict); 52 53 typedef struct { 54 int count; 55 u_char bytes[4]; 56 } _GB18030State; 57 58 int 59 _GB18030_init(struct xlocale_ctype *l, _RuneLocale *rl) 60 { 61 62 l->__mbrtowc = _GB18030_mbrtowc; 63 l->__wcrtomb = _GB18030_wcrtomb; 64 l->__mbsinit = _GB18030_mbsinit; 65 l->runes = rl; 66 l->__mb_cur_max = 4; 67 l->__mb_sb_limit = 128; 68 69 return (0); 70 } 71 72 static int 73 _GB18030_mbsinit(const mbstate_t *ps) 74 { 75 76 return (ps == NULL || ((const _GB18030State *)ps)->count == 0); 77 } 78 79 static size_t 80 _GB18030_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, 81 size_t n, mbstate_t * __restrict ps) 82 { 83 _GB18030State *gs; 84 wchar_t wch; 85 int ch, len, ocount; 86 size_t ncopy; 87 88 gs = (_GB18030State *)ps; 89 90 if (gs->count < 0 || gs->count > sizeof(gs->bytes)) { 91 errno = EINVAL; 92 return ((size_t)-1); 93 } 94 95 if (s == NULL) { 96 s = ""; 97 n = 1; 98 pwc = NULL; 99 } 100 101 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count); 102 memcpy(gs->bytes + gs->count, s, ncopy); 103 ocount = gs->count; 104 gs->count += ncopy; 105 s = (char *)gs->bytes; 106 n = gs->count; 107 108 if (n == 0) 109 /* Incomplete multibyte sequence */ 110 return ((size_t)-2); 111 112 /* 113 * Single byte: [00-7f] 114 * Two byte: [81-fe][40-7e,80-fe] 115 * Four byte: [81-fe][30-39][81-fe][30-39] 116 */ 117 ch = (unsigned char)*s++; 118 if (ch <= 0x7f) { 119 len = 1; 120 wch = ch; 121 } else if (ch >= 0x81 && ch <= 0xfe) { 122 wch = ch; 123 if (n < 2) 124 return ((size_t)-2); 125 ch = (unsigned char)*s++; 126 if ((ch >= 0x40 && ch <= 0x7e) || (ch >= 0x80 && ch <= 0xfe)) { 127 wch = (wch << 8) | ch; 128 len = 2; 129 } else if (ch >= 0x30 && ch <= 0x39) { 130 /* 131 * Strip high bit off the wide character we will 132 * eventually output so that it is positive when 133 * cast to wint_t on 32-bit twos-complement machines. 134 */ 135 wch = ((wch & 0x7f) << 8) | ch; 136 if (n < 3) 137 return ((size_t)-2); 138 ch = (unsigned char)*s++; 139 if (ch < 0x81 || ch > 0xfe) 140 goto ilseq; 141 wch = (wch << 8) | ch; 142 if (n < 4) 143 return ((size_t)-2); 144 ch = (unsigned char)*s++; 145 if (ch < 0x30 || ch > 0x39) 146 goto ilseq; 147 wch = (wch << 8) | ch; 148 len = 4; 149 } else 150 goto ilseq; 151 } else 152 goto ilseq; 153 154 if (pwc != NULL) 155 *pwc = wch; 156 gs->count = 0; 157 return (wch == L'\0' ? 0 : len - ocount); 158 ilseq: 159 errno = EILSEQ; 160 return ((size_t)-1); 161 } 162 163 static size_t 164 _GB18030_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 165 { 166 _GB18030State *gs; 167 size_t len; 168 int c; 169 170 gs = (_GB18030State *)ps; 171 172 if (gs->count != 0) { 173 errno = EINVAL; 174 return ((size_t)-1); 175 } 176 177 if (s == NULL) 178 /* Reset to initial shift state (no-op) */ 179 return (1); 180 if ((wc & ~0x7fffffff) != 0) 181 goto ilseq; 182 if (wc & 0x7f000000) { 183 /* Replace high bit that mbrtowc() removed. */ 184 wc |= 0x80000000; 185 c = (wc >> 24) & 0xff; 186 if (c < 0x81 || c > 0xfe) 187 goto ilseq; 188 *s++ = c; 189 c = (wc >> 16) & 0xff; 190 if (c < 0x30 || c > 0x39) 191 goto ilseq; 192 *s++ = c; 193 c = (wc >> 8) & 0xff; 194 if (c < 0x81 || c > 0xfe) 195 goto ilseq; 196 *s++ = c; 197 c = wc & 0xff; 198 if (c < 0x30 || c > 0x39) 199 goto ilseq; 200 *s++ = c; 201 len = 4; 202 } else if (wc & 0x00ff0000) 203 goto ilseq; 204 else if (wc & 0x0000ff00) { 205 c = (wc >> 8) & 0xff; 206 if (c < 0x81 || c > 0xfe) 207 goto ilseq; 208 *s++ = c; 209 c = wc & 0xff; 210 if (c < 0x40 || c == 0x7f || c == 0xff) 211 goto ilseq; 212 *s++ = c; 213 len = 2; 214 } else if (wc <= 0x7f) { 215 *s++ = wc; 216 len = 1; 217 } else 218 goto ilseq; 219 220 return (len); 221 ilseq: 222 errno = EILSEQ; 223 return ((size_t)-1); 224 } 225