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(7) 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, boolean_t); 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 void 59 _GB18030_init(struct lc_ctype *lct) 60 { 61 62 lct->lc_mbrtowc = _GB18030_mbrtowc; 63 lct->lc_wcrtomb = _GB18030_wcrtomb; 64 lct->lc_mbsinit = _GB18030_mbsinit; 65 lct->lc_mbsnrtowcs = _GB18030_mbsnrtowcs; 66 lct->lc_wcsnrtombs = _GB18030_wcsnrtombs; 67 lct->lc_max_mblen = 4; 68 lct->lc_is_ascii = 0; 69 } 70 71 static int 72 _GB18030_mbsinit(const mbstate_t *ps) 73 { 74 75 return (ps == NULL || ((const _GB18030State *)ps)->count == 0); 76 } 77 78 static size_t 79 _GB18030_mbrtowc(wchar_t *_RESTRICT_KYWD pwc, const char *_RESTRICT_KYWD s, 80 size_t n, mbstate_t *_RESTRICT_KYWD ps, boolean_t zero) 81 { 82 _GB18030State *gs; 83 wchar_t wch; 84 int ch, len, ocount; 85 size_t ncopy; 86 87 gs = (_GB18030State *)ps; 88 89 if (gs->count < 0 || gs->count > sizeof (gs->bytes)) { 90 errno = EINVAL; 91 return ((size_t)-1); 92 } 93 94 if (s == NULL) { 95 s = ""; 96 n = 1; 97 pwc = NULL; 98 } 99 100 ncopy = MIN(MIN(n, MB_CUR_MAX), sizeof (gs->bytes) - gs->count); 101 (void) memcpy(gs->bytes + gs->count, s, ncopy); 102 ocount = gs->count; 103 gs->count += ncopy; 104 s = (char *)gs->bytes; 105 n = gs->count; 106 107 if (n == 0) 108 /* Incomplete multibyte sequence */ 109 return ((size_t)-2); 110 111 /* 112 * Single byte: [00-7f] 113 * Two byte: [81-fe][40-7e,80-fe] 114 * Four byte: [81-fe][30-39][81-fe][30-39] 115 */ 116 ch = (unsigned char)*s++; 117 if (ch <= 0x7f) { 118 len = 1; 119 wch = ch; 120 } else if (ch >= 0x81 && ch <= 0xfe) { 121 wch = ch; 122 if (n < 2) 123 return ((size_t)-2); 124 ch = (unsigned char)*s++; 125 if ((ch >= 0x40 && ch <= 0x7e) || (ch >= 0x80 && ch <= 0xfe)) { 126 wch = (wch << 8) | ch; 127 len = 2; 128 } else if (ch >= 0x30 && ch <= 0x39) { 129 /* 130 * Strip high bit off the wide character we will 131 * eventually output so that it is positive when 132 * cast to wint_t on 32-bit twos-complement machines. 133 */ 134 wch = ((wch & 0x7f) << 8) | ch; 135 if (n < 3) 136 return ((size_t)-2); 137 ch = (unsigned char)*s++; 138 if (ch < 0x81 || ch > 0xfe) 139 goto ilseq; 140 wch = (wch << 8) | ch; 141 if (n < 4) 142 return ((size_t)-2); 143 ch = (unsigned char)*s++; 144 if (ch < 0x30 || ch > 0x39) 145 goto ilseq; 146 wch = (wch << 8) | ch; 147 len = 4; 148 } else 149 goto ilseq; 150 } else 151 goto ilseq; 152 153 if (pwc != NULL) 154 *pwc = wch; 155 gs->count = 0; 156 if (zero || wch != L'\0') { 157 return (len - ocount); 158 } else { 159 return (0); 160 } 161 ilseq: 162 errno = EILSEQ; 163 return ((size_t)-1); 164 } 165 166 static size_t 167 _GB18030_wcrtomb(char *_RESTRICT_KYWD s, wchar_t wc, 168 mbstate_t *_RESTRICT_KYWD ps) 169 { 170 _GB18030State *gs; 171 size_t len; 172 int c; 173 174 gs = (_GB18030State *)ps; 175 176 if (gs->count != 0) { 177 errno = EINVAL; 178 return ((size_t)-1); 179 } 180 181 if (s == NULL) 182 /* Reset to initial shift state (no-op) */ 183 return (1); 184 if ((wc & ~0x7fffffff) != 0) 185 goto ilseq; 186 if (wc & 0x7f000000) { 187 /* Replace high bit that mbrtowc() removed. */ 188 wc |= 0x80000000; 189 c = (wc >> 24) & 0xff; 190 if (c < 0x81 || c > 0xfe) 191 goto ilseq; 192 *s++ = c; 193 c = (wc >> 16) & 0xff; 194 if (c < 0x30 || c > 0x39) 195 goto ilseq; 196 *s++ = c; 197 c = (wc >> 8) & 0xff; 198 if (c < 0x81 || c > 0xfe) 199 goto ilseq; 200 *s++ = c; 201 c = wc & 0xff; 202 if (c < 0x30 || c > 0x39) 203 goto ilseq; 204 *s++ = c; 205 len = 4; 206 } else if (wc & 0x00ff0000) 207 goto ilseq; 208 else if (wc & 0x0000ff00) { 209 c = (wc >> 8) & 0xff; 210 if (c < 0x81 || c > 0xfe) 211 goto ilseq; 212 *s++ = c; 213 c = wc & 0xff; 214 if (c < 0x40 || c == 0x7f || c == 0xff) 215 goto ilseq; 216 *s++ = c; 217 len = 2; 218 } else if (wc <= 0x7f) { 219 *s++ = wc; 220 len = 1; 221 } else 222 goto ilseq; 223 224 return (len); 225 ilseq: 226 errno = EILSEQ; 227 return ((size_t)-1); 228 } 229 230 static size_t 231 _GB18030_mbsnrtowcs(wchar_t *_RESTRICT_KYWD dst, 232 const char **_RESTRICT_KYWD src, size_t nms, size_t len, 233 mbstate_t *_RESTRICT_KYWD ps) 234 { 235 return (__mbsnrtowcs_std(dst, src, nms, len, ps, _GB18030_mbrtowc)); 236 } 237 238 static size_t 239 _GB18030_wcsnrtombs(char *_RESTRICT_KYWD dst, 240 const wchar_t **_RESTRICT_KYWD src, size_t nwc, size_t len, 241 mbstate_t *_RESTRICT_KYWD ps) 242 { 243 return (__wcsnrtombs_std(dst, src, nwc, len, ps, _GB18030_wcrtomb)); 244 } 245