citrus_utf8.c revision 1.10
1 /* $NetBSD: citrus_utf8.c,v 1.10 2003/08/07 16:42:38 agc Exp $ */ 2 3 /*- 4 * Copyright (c)2002 Citrus Project, 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 * Copyright (c) 1993 31 * The Regents of the University of California. All rights reserved. 32 * 33 * This code is derived from software contributed to Berkeley by 34 * Paul Borman at Krystal Technologies. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 */ 60 61 #include <sys/cdefs.h> 62 #if defined(LIBC_SCCS) && !defined(lint) 63 __RCSID("$NetBSD: citrus_utf8.c,v 1.10 2003/08/07 16:42:38 agc Exp $"); 64 #endif /* LIBC_SCCS and not lint */ 65 66 #include <assert.h> 67 #include <errno.h> 68 #include <string.h> 69 #include <stdio.h> 70 #include <stdlib.h> 71 #include <stddef.h> 72 #include <locale.h> 73 #include <wchar.h> 74 #include <sys/types.h> 75 #include <limits.h> 76 77 #include "citrus_namespace.h" 78 #include "citrus_types.h" 79 #include "citrus_module.h" 80 #include "citrus_ctype.h" 81 #include "citrus_stdenc.h" 82 #include "citrus_utf8.h" 83 84 85 /* ---------------------------------------------------------------------- 86 * private stuffs used by templates 87 */ 88 89 static int _UTF8_count_array[256]; 90 static int const *_UTF8_count = NULL; 91 92 static u_int32_t _UTF8_range[] = { 93 0, /*dummy*/ 94 0x00000000, 0x00000080, 0x00000800, 0x00010000, 95 0x00200000, 0x04000000, 0x80000000, 96 }; 97 98 typedef struct { 99 char ch[6]; 100 int chlen; 101 } _UTF8State; 102 103 typedef struct { 104 } _UTF8EncodingInfo; 105 106 typedef struct { 107 _UTF8EncodingInfo ei; 108 struct { 109 /* for future multi-locale facility */ 110 _UTF8State s_mblen; 111 _UTF8State s_mbrlen; 112 _UTF8State s_mbrtowc; 113 _UTF8State s_mbtowc; 114 _UTF8State s_mbsrtowcs; 115 _UTF8State s_wcrtomb; 116 _UTF8State s_wcsrtombs; 117 _UTF8State s_wctomb; 118 } states; 119 } _UTF8CTypeInfo; 120 121 #define _CEI_TO_EI(_cei_) (&(_cei_)->ei) 122 #define _CEI_TO_STATE(_ei_, _func_) (_ei_)->states.s_##_func_ 123 124 #define _FUNCNAME(m) _citrus_UTF8_##m 125 #define _ENCODING_INFO _UTF8EncodingInfo 126 #define _CTYPE_INFO _UTF8CTypeInfo 127 #define _ENCODING_STATE _UTF8State 128 #define _ENCODING_MB_CUR_MAX(_ei_) 6 129 #define _ENCODING_IS_STATE_DEPENDENT 0 130 #define _STATE_NEEDS_EXPLICIT_INIT(_ps_) 0 131 132 133 static __inline void 134 _UTF8_init_count(void) 135 { 136 int i; 137 if (!_UTF8_count) { 138 memset(_UTF8_count_array, 0, sizeof(_UTF8_count_array)); 139 for (i = 0; i <= 0x7f; i++) 140 _UTF8_count_array[i] = 1; 141 for (i = 0xc0; i <= 0xdf; i++) 142 _UTF8_count_array[i] = 2; 143 for (i = 0xe0; i <= 0xef; i++) 144 _UTF8_count_array[i] = 3; 145 for (i = 0xf0; i <= 0xf7; i++) 146 _UTF8_count_array[i] = 4; 147 for (i = 0xf8; i <= 0xfb; i++) 148 _UTF8_count_array[i] = 5; 149 for (i = 0xfc; i <= 0xfd; i++) 150 _UTF8_count_array[i] = 6; 151 _UTF8_count = _UTF8_count_array; 152 } 153 } 154 155 static int 156 _UTF8_findlen(wchar_t v) 157 { 158 int i; 159 u_int32_t c; 160 161 c = (u_int32_t)v; /*XXX*/ 162 for (i = 1; i < sizeof(_UTF8_range) / sizeof(_UTF8_range[0]); i++) 163 if (c >= _UTF8_range[i] && c < _UTF8_range[i + 1]) 164 return i; 165 166 return -1; /*out of range*/ 167 } 168 169 static __inline void 170 /*ARGSUSED*/ 171 _citrus_UTF8_init_state(_UTF8EncodingInfo *ei, _UTF8State *s) 172 { 173 memset(s, 0, sizeof(*s)); 174 } 175 176 static __inline void 177 /*ARGSUSED*/ 178 _citrus_UTF8_pack_state(_UTF8EncodingInfo *ei, void *pspriv, 179 const _UTF8State *s) 180 { 181 memcpy(pspriv, (const void *)s, sizeof(*s)); 182 } 183 184 static __inline void 185 /*ARGSUSED*/ 186 _citrus_UTF8_unpack_state(_UTF8EncodingInfo *ei, _UTF8State *s, 187 const void *pspriv) 188 { 189 memcpy((void *)s, pspriv, sizeof(*s)); 190 } 191 192 static int 193 _citrus_UTF8_mbrtowc_priv(_UTF8EncodingInfo *ei, wchar_t *pwc, const char **s, 194 size_t n, _UTF8State *psenc, size_t *nresult) 195 { 196 wchar_t wchar; 197 const char *s0; 198 int c; 199 int i; 200 int chlenbak; 201 202 _DIAGASSERT(nresult != 0); 203 _DIAGASSERT(ei != NULL); 204 _DIAGASSERT(s != NULL); 205 _DIAGASSERT(psenc != NULL); 206 207 s0 = *s; 208 209 if (s0 == NULL) { 210 _citrus_UTF8_init_state(ei, psenc); 211 *nresult = 0; /* state independent */ 212 return (0); 213 } 214 215 chlenbak = psenc->chlen; 216 217 /* make sure we have the first byte in the buffer */ 218 switch (psenc->chlen) { 219 case 0: 220 if (n < 1) { 221 goto restart; 222 } 223 psenc->ch[0] = *s0++; 224 psenc->chlen = 1; 225 n--; 226 break; 227 case 1: case 2: case 3: case 4: case 5: 228 break; 229 default: 230 /* illegal state */ 231 goto ilseq; 232 } 233 234 c = _UTF8_count[psenc->ch[0] & 0xff]; 235 if (c == 0) 236 goto ilseq; 237 while (psenc->chlen < c) { 238 if (n < 1) { 239 goto restart; 240 } 241 psenc->ch[psenc->chlen] = *s0++; 242 psenc->chlen++; 243 n--; 244 } 245 246 switch (c) { 247 case 1: 248 wchar = psenc->ch[0] & 0xff; 249 break; 250 case 2: case 3: case 4: case 5: case 6: 251 wchar = psenc->ch[0] & (0x7f >> c); 252 for (i = 1; i < c; i++) { 253 if ((psenc->ch[i] & 0xc0) != 0x80) 254 goto ilseq; 255 wchar <<= 6; 256 wchar |= (psenc->ch[i] & 0x3f); 257 } 258 259 _DIAGASSERT(findlen(wchar) == c); 260 261 break; 262 } 263 264 *s = s0; 265 266 psenc->chlen = 0; 267 268 if (pwc) 269 *pwc = wchar; 270 271 if (!wchar) 272 *nresult = 0; 273 else 274 *nresult = c - chlenbak; 275 276 return (0); 277 278 ilseq: 279 psenc->chlen = 0; 280 *nresult = (size_t)-1; 281 return (EILSEQ); 282 283 restart: 284 *s = s0; 285 *nresult = (size_t)-2; 286 return (0); 287 } 288 289 static int 290 _citrus_UTF8_wcrtomb_priv(_UTF8EncodingInfo *ei, char *s, size_t n, wchar_t wc, 291 _UTF8State *psenc, size_t *nresult) 292 { 293 int cnt, i, ret; 294 wchar_t c; 295 296 _DIAGASSERT(ei != NULL); 297 _DIAGASSERT(nresult != 0); 298 _DIAGASSERT(s != NULL); 299 300 cnt = _UTF8_findlen(wc); 301 if (cnt <= 0 || cnt > 6) { 302 /* invalid UCS4 value */ 303 ret = EILSEQ; 304 goto err; 305 } 306 if (n < cnt) { 307 /* bound check failure */ 308 ret = E2BIG; 309 goto err; 310 } 311 312 c = wc; 313 if (s) { 314 for (i = cnt - 1; i > 0; i--) { 315 s[i] = 0x80 | (c & 0x3f); 316 c >>= 6; 317 } 318 s[0] = c; 319 if (cnt == 1) 320 s[0] &= 0x7f; 321 else { 322 s[0] &= (0x7f >> cnt); 323 s[0] |= ((0xff00 >> cnt) & 0xff); 324 } 325 } 326 327 *nresult = (size_t)cnt; 328 return 0; 329 330 err: 331 *nresult = (size_t)-1; 332 return ret; 333 } 334 335 static __inline int 336 /*ARGSUSED*/ 337 _citrus_UTF8_stdenc_wctocs(_UTF8EncodingInfo * __restrict ei, 338 _csid_t * __restrict csid, 339 _index_t * __restrict idx, 340 wchar_t wc) 341 { 342 343 _DIAGASSERT(csid != NULL && idx != NULL); 344 345 *csid = 0; 346 *idx = (_citrus_index_t)wc; 347 348 return (0); 349 } 350 351 static __inline int 352 /*ARGSUSED*/ 353 _citrus_UTF8_stdenc_cstowc(_UTF8EncodingInfo * __restrict ei, 354 wchar_t * __restrict wc, 355 _csid_t csid, _index_t idx) 356 { 357 358 _DIAGASSERT(wc != NULL); 359 360 if (csid != 0) 361 return (EILSEQ); 362 363 *wc = (wchar_t)idx; 364 365 return (0); 366 } 367 368 static int 369 /*ARGSUSED*/ 370 _citrus_UTF8_encoding_module_init(_UTF8EncodingInfo * __restrict ei, 371 const void * __restrict var, size_t lenvar) 372 { 373 _DIAGASSERT(ei != NULL); 374 375 _UTF8_init_count(); 376 memset((void *)ei, 0, sizeof(*ei)); 377 378 return 0; 379 } 380 381 static void 382 /*ARGSUSED*/ 383 _citrus_UTF8_encoding_module_uninit(_UTF8EncodingInfo *ei) 384 { 385 } 386 387 388 /* ---------------------------------------------------------------------- 389 * public interface for ctype 390 */ 391 392 _CITRUS_CTYPE_DECLS(UTF8); 393 _CITRUS_CTYPE_DEF_OPS(UTF8); 394 395 #include "citrus_ctype_template.h" 396 397 /* ---------------------------------------------------------------------- 398 * public interface for stdenc 399 */ 400 401 _CITRUS_STDENC_DECLS(UTF8); 402 _CITRUS_STDENC_DEF_OPS(UTF8); 403 404 #include "citrus_stdenc_template.h" 405
Indexes created Wed Oct 22 06:10:02 GMT 2025