1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright 2013 Garrett D'Amore <garrett@damore.org> 5 * Copyright 2010 Nexenta Systems, Inc. All rights reserved. 6 * Copyright (c) 2002-2004 Tim J. Robbins 7 * All rights reserved. 8 * 9 * Copyright (c) 2011 The FreeBSD Foundation 10 * 11 * Portions of this software were developed by David Chisnall 12 * under sponsorship from the FreeBSD Foundation. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /* 37 * PRC National Standard GB 18030-2000 encoding of Chinese text. 38 * 39 * See gb18030(5) for details. 40 */ 41 42 #include <sys/param.h> 43 #include <errno.h> 44 #include <runetype.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <wchar.h> 48 #include "mblocal.h" 49 50 static size_t _GB18030_mbrtowc(wchar_t * __restrict, const char * __restrict, 51 size_t, mbstate_t * __restrict); 52 static int _GB18030_mbsinit(const mbstate_t *); 53 static size_t _GB18030_wcrtomb(char * __restrict, wchar_t, 54 mbstate_t * __restrict); 55 static size_t _GB18030_mbsnrtowcs(wchar_t * __restrict, 56 const char ** __restrict, size_t, size_t, 57 mbstate_t * __restrict); 58 static size_t _GB18030_wcsnrtombs(char * __restrict, 59 const wchar_t ** __restrict, size_t, size_t, 60 mbstate_t * __restrict); 61 62 63 typedef struct { 64 int count; 65 u_char bytes[4]; 66 } _GB18030State; 67 68 int 69 _GB18030_init(struct xlocale_ctype *l, _RuneLocale *rl) 70 { 71 72 l->__mbrtowc = _GB18030_mbrtowc; 73 l->__wcrtomb = _GB18030_wcrtomb; 74 l->__mbsinit = _GB18030_mbsinit; 75 l->__mbsnrtowcs = _GB18030_mbsnrtowcs; 76 l->__wcsnrtombs = _GB18030_wcsnrtombs; 77 l->runes = rl; 78 l->__mb_cur_max = 4; 79 l->__mb_sb_limit = 128; 80 81 return (0); 82 } 83 84 static int 85 _GB18030_mbsinit(const mbstate_t *ps) 86 { 87 88 return (ps == NULL || ((const _GB18030State *)ps)->count == 0); 89 } 90 91 static size_t 92 _GB18030_mbrtowc(wchar_t * __restrict pwc, const char * __restrict s, 93 size_t n, mbstate_t * __restrict ps) 94 { 95 _GB18030State *gs; 96 wchar_t wch; 97 int ch, len, ocount; 98 size_t ncopy; 99 100 gs = (_GB18030State *)ps; 101 102 if (gs->count < 0 || gs->count > sizeof(gs->bytes)) { 103 errno = EINVAL; 104 return ((size_t)-1); 105 } 106 107 if (s == NULL) { 108 s = ""; 109 n = 1; 110 pwc = NULL; 111 } 112 113 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof(gs->bytes) - gs->count); 114 memcpy(gs->bytes + gs->count, s, ncopy); 115 ocount = gs->count; 116 gs->count += ncopy; 117 s = (char *)gs->bytes; 118 n = gs->count; 119 120 if (n == 0) 121 /* Incomplete multibyte sequence */ 122 return ((size_t)-2); 123 124 /* 125 * Single byte: [00-7f] 126 * Two byte: [81-fe][40-7e,80-fe] 127 * Four byte: [81-fe][30-39][81-fe][30-39] 128 */ 129 ch = (unsigned char)*s++; 130 if (ch <= 0x7f) { 131 len = 1; 132 wch = ch; 133 } else if (ch >= 0x81 && ch <= 0xfe) { 134 wch = ch; 135 if (n < 2) 136 return ((size_t)-2); 137 ch = (unsigned char)*s++; 138 if ((ch >= 0x40 && ch <= 0x7e) || (ch >= 0x80 && ch <= 0xfe)) { 139 wch = (wch << 8) | ch; 140 len = 2; 141 } else if (ch >= 0x30 && ch <= 0x39) { 142 /* 143 * Strip high bit off the wide character we will 144 * eventually output so that it is positive when 145 * cast to wint_t on 32-bit twos-complement machines. 146 */ 147 wch = ((wch & 0x7f) << 8) | ch; 148 if (n < 3) 149 return ((size_t)-2); 150 ch = (unsigned char)*s++; 151 if (ch < 0x81 || ch > 0xfe) 152 goto ilseq; 153 wch = (wch << 8) | ch; 154 if (n < 4) 155 return ((size_t)-2); 156 ch = (unsigned char)*s++; 157 if (ch < 0x30 || ch > 0x39) 158 goto ilseq; 159 wch = (wch << 8) | ch; 160 len = 4; 161 } else 162 goto ilseq; 163 } else 164 goto ilseq; 165 166 if (pwc != NULL) 167 *pwc = wch; 168 gs->count = 0; 169 return (wch == L'\0' ? 0 : len - ocount); 170 ilseq: 171 errno = EILSEQ; 172 return ((size_t)-1); 173 } 174 175 static size_t 176 _GB18030_wcrtomb(char * __restrict s, wchar_t wc, mbstate_t * __restrict ps) 177 { 178 _GB18030State *gs; 179 size_t len; 180 int c; 181 182 gs = (_GB18030State *)ps; 183 184 if (gs->count != 0) { 185 errno = EINVAL; 186 return ((size_t)-1); 187 } 188 189 if (s == NULL) 190 /* Reset to initial shift state (no-op) */ 191 return (1); 192 if ((wc & ~0x7fffffff) != 0) 193 goto ilseq; 194 if (wc & 0x7f000000) { 195 /* Replace high bit that mbrtowc() removed. */ 196 wc |= 0x80000000; 197 c = (wc >> 24) & 0xff; 198 if (c < 0x81 || c > 0xfe) 199 goto ilseq; 200 *s++ = c; 201 c = (wc >> 16) & 0xff; 202 if (c < 0x30 || c > 0x39) 203 goto ilseq; 204 *s++ = c; 205 c = (wc >> 8) & 0xff; 206 if (c < 0x81 || c > 0xfe) 207 goto ilseq; 208 *s++ = c; 209 c = wc & 0xff; 210 if (c < 0x30 || c > 0x39) 211 goto ilseq; 212 *s++ = c; 213 len = 4; 214 } else if (wc & 0x00ff0000) 215 goto ilseq; 216 else if (wc & 0x0000ff00) { 217 c = (wc >> 8) & 0xff; 218 if (c < 0x81 || c > 0xfe) 219 goto ilseq; 220 *s++ = c; 221 c = wc & 0xff; 222 if (c < 0x40 || c == 0x7f || c == 0xff) 223 goto ilseq; 224 *s++ = c; 225 len = 2; 226 } else if (wc <= 0x7f) { 227 *s++ = wc; 228 len = 1; 229 } else 230 goto ilseq; 231 232 return (len); 233 ilseq: 234 errno = EILSEQ; 235 return ((size_t)-1); 236 } 237 238 static size_t 239 _GB18030_mbsnrtowcs(wchar_t * __restrict dst, 240 const char ** __restrict src, size_t nms, size_t len, 241 mbstate_t * __restrict ps) 242 { 243 return (__mbsnrtowcs_std(dst, src, nms, len, ps, _GB18030_mbrtowc)); 244 } 245 246 static size_t 247 _GB18030_wcsnrtombs(char * __restrict dst, 248 const wchar_t ** __restrict src, size_t nwc, size_t len, 249 mbstate_t * __restrict ps) 250 { 251 return (__wcsnrtombs_std(dst, src, nwc, len, ps, _GB18030_wcrtomb)); 252 } 253