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