1 /* 2 * Copyright (C) 1984-2015 Mark Nudelman 3 * 4 * You may distribute under the terms of either the GNU General Public 5 * License or the Less License, as specified in the README file. 6 * 7 * For more information, see the README file. 8 */ 9 10 11 /* 12 * Functions to define the character set 13 * and do things specific to the character set. 14 */ 15 16 #include "less.h" 17 #if HAVE_LOCALE 18 #include <locale.h> 19 #include <ctype.h> 20 #include <langinfo.h> 21 #endif 22 23 #include "charset.h" 24 25 public int utf_mode = 0; 26 27 /* 28 * Predefined character sets, 29 * selected by the LESSCHARSET environment variable. 30 */ 31 struct charset { 32 char *name; 33 int *p_flag; 34 char *desc; 35 } charsets[] = { 36 { "ascii", NULL, "8bcccbcc18b95.b" }, 37 { "utf-8", &utf_mode, "8bcccbcc18b95.b126.bb" }, 38 { "iso8859", NULL, "8bcccbcc18b95.33b." }, 39 { "latin3", NULL, "8bcccbcc18b95.33b5.b8.b15.b4.b12.b18.b12.b." }, 40 { "arabic", NULL, "8bcccbcc18b95.33b.3b.7b2.13b.3b.b26.5b19.b" }, 41 { "greek", NULL, "8bcccbcc18b95.33b4.2b4.b3.b35.b44.b" }, 42 { "greek2005", NULL, "8bcccbcc18b95.33b14.b35.b44.b" }, 43 { "hebrew", NULL, "8bcccbcc18b95.33b.b29.32b28.2b2.b" }, 44 { "koi8-r", NULL, "8bcccbcc18b95.b." }, 45 { "KOI8-T", NULL, "8bcccbcc18b95.b8.b6.b8.b.b.5b7.3b4.b4.b3.b.b.3b." }, 46 { "georgianps", NULL, "8bcccbcc18b95.3b11.4b12.2b." }, 47 { "tcvn", NULL, "b..b...bcccbccbbb7.8b95.b48.5b." }, 48 { "TIS-620", NULL, "8bcccbcc18b95.b.4b.11b7.8b." }, 49 { "next", NULL, "8bcccbcc18b95.bb125.bb" }, 50 { "dos", NULL, "8bcccbcc12bc5b95.b." }, 51 { "windows-1251", NULL, "8bcccbcc12bc5b95.b24.b." }, 52 { "windows-1252", NULL, "8bcccbcc12bc5b95.b.b11.b.2b12.b." }, 53 { "windows-1255", NULL, "8bcccbcc12bc5b95.b.b8.b.5b9.b.4b." }, 54 { "ebcdic", NULL, "5bc6bcc7bcc41b.9b7.9b5.b..8b6.10b6.b9.7b9.8b8.17b3.3b9.7b9.8b8.6b10.b.b.b." }, 55 { "IBM-1047", NULL, "4cbcbc3b9cbccbccbb4c6bcc5b3cbbc4bc4bccbc191.b" }, 56 { NULL, NULL, NULL } 57 }; 58 59 /* 60 * Support "locale charmap"/nl_langinfo(CODESET) values, as well as others. 61 */ 62 struct cs_alias { 63 char *name; 64 char *oname; 65 } cs_aliases[] = { 66 { "UTF-8", "utf-8" }, 67 { "ANSI_X3.4-1968", "ascii" }, 68 { "US-ASCII", "ascii" }, 69 { "latin1", "iso8859" }, 70 { "ISO-8859-1", "iso8859" }, 71 { "latin9", "iso8859" }, 72 { "ISO-8859-15", "iso8859" }, 73 { "latin2", "iso8859" }, 74 { "ISO-8859-2", "iso8859" }, 75 { "ISO-8859-3", "latin3" }, 76 { "latin4", "iso8859" }, 77 { "ISO-8859-4", "iso8859" }, 78 { "cyrillic", "iso8859" }, 79 { "ISO-8859-5", "iso8859" }, 80 { "ISO-8859-6", "arabic" }, 81 { "ISO-8859-7", "greek" }, 82 { "IBM9005", "greek2005" }, 83 { "ISO-8859-8", "hebrew" }, 84 { "latin5", "iso8859" }, 85 { "ISO-8859-9", "iso8859" }, 86 { "latin6", "iso8859" }, 87 { "ISO-8859-10", "iso8859" }, 88 { "latin7", "iso8859" }, 89 { "ISO-8859-13", "iso8859" }, 90 { "latin8", "iso8859" }, 91 { "ISO-8859-14", "iso8859" }, 92 { "latin10", "iso8859" }, 93 { "ISO-8859-16", "iso8859" }, 94 { "IBM437", "dos" }, 95 { "EBCDIC-US", "ebcdic" }, 96 { "IBM1047", "IBM-1047" }, 97 { "KOI8-R", "koi8-r" }, 98 { "KOI8-U", "koi8-r" }, 99 { "GEORGIAN-PS", "georgianps" }, 100 { "TCVN5712-1", "tcvn" }, 101 { "NEXTSTEP", "next" }, 102 { "windows", "windows-1252" }, /* backward compatibility */ 103 { "CP1251", "windows-1251" }, 104 { "CP1252", "windows-1252" }, 105 { "CP1255", "windows-1255" }, 106 { NULL, NULL } 107 }; 108 109 #define IS_BINARY_CHAR 01 110 #define IS_CONTROL_CHAR 02 111 112 static char chardef[256]; 113 static char *binfmt = NULL; 114 static char *utfbinfmt = NULL; 115 public int binattr = AT_STANDOUT; 116 117 118 /* 119 * Define a charset, given a description string. 120 * The string consists of 256 letters, 121 * one for each character in the charset. 122 * If the string is shorter than 256 letters, missing letters 123 * are taken to be identical to the last one. 124 * A decimal number followed by a letter is taken to be a 125 * repetition of the letter. 126 * 127 * Each letter is one of: 128 * . normal character 129 * b binary character 130 * c control character 131 */ 132 static void 133 ichardef(char *s) 134 { 135 char *cp; 136 int n; 137 char v; 138 139 n = 0; 140 v = 0; 141 cp = chardef; 142 while (*s != '\0') 143 { 144 switch (*s++) 145 { 146 case '.': 147 v = 0; 148 break; 149 case 'c': 150 v = IS_CONTROL_CHAR; 151 break; 152 case 'b': 153 v = IS_BINARY_CHAR|IS_CONTROL_CHAR; 154 break; 155 156 case '0': case '1': case '2': case '3': case '4': 157 case '5': case '6': case '7': case '8': case '9': 158 n = (10 * n) + (s[-1] - '0'); 159 continue; 160 161 default: 162 error("invalid chardef", NULL_PARG); 163 quit(QUIT_ERROR); 164 /*NOTREACHED*/ 165 } 166 167 do 168 { 169 if (cp >= chardef + sizeof(chardef)) 170 { 171 error("chardef longer than 256", NULL_PARG); 172 quit(QUIT_ERROR); 173 /*NOTREACHED*/ 174 } 175 *cp++ = v; 176 } while (--n > 0); 177 n = 0; 178 } 179 180 while (cp < chardef + sizeof(chardef)) 181 *cp++ = v; 182 } 183 184 /* 185 * Define a charset, given a charset name. 186 * The valid charset names are listed in the "charsets" array. 187 */ 188 static int 189 icharset(char *name, int no_error) 190 { 191 struct charset *p; 192 struct cs_alias *a; 193 194 if (name == NULL || *name == '\0') 195 return (0); 196 197 /* First see if the name is an alias. */ 198 for (a = cs_aliases; a->name != NULL; a++) 199 { 200 if (strcmp(name, a->name) == 0) 201 { 202 name = a->oname; 203 break; 204 } 205 } 206 207 for (p = charsets; p->name != NULL; p++) 208 { 209 if (strcmp(name, p->name) == 0) 210 { 211 ichardef(p->desc); 212 if (p->p_flag != NULL) 213 *(p->p_flag) = 1; 214 return (1); 215 } 216 } 217 218 if (!no_error) { 219 error("invalid charset name", NULL_PARG); 220 quit(QUIT_ERROR); 221 } 222 return (0); 223 } 224 225 #if HAVE_LOCALE 226 /* 227 * Define a charset, given a locale name. 228 */ 229 static void 230 ilocale(void) 231 { 232 int c; 233 234 for (c = 0; c < (int) sizeof(chardef); c++) 235 { 236 if (isprint(c)) 237 chardef[c] = 0; 238 else if (iscntrl(c)) 239 chardef[c] = IS_CONTROL_CHAR; 240 else 241 chardef[c] = IS_BINARY_CHAR|IS_CONTROL_CHAR; 242 } 243 } 244 #endif 245 246 /* 247 * Define the printing format for control (or binary utf) chars. 248 */ 249 static void 250 setbinfmt(char *s, char **fmtvarptr, char *default_fmt) 251 { 252 if (s && utf_mode) 253 { 254 /* It would be too hard to account for width otherwise. */ 255 char *t = s; 256 while (*t) 257 { 258 if (*t < ' ' || *t > '~') 259 { 260 s = default_fmt; 261 goto attr; 262 } 263 t++; 264 } 265 } 266 267 /* %n is evil */ 268 if (s == NULL || *s == '\0' || 269 (*s == '*' && (s[1] == '\0' || s[2] == '\0' || strchr(s + 2, 'n'))) || 270 (*s != '*' && strchr(s, 'n'))) 271 s = default_fmt; 272 273 /* 274 * Select the attributes if it starts with "*". 275 */ 276 attr: 277 if (*s == '*') 278 { 279 switch (s[1]) 280 { 281 case 'd': binattr = AT_BOLD; break; 282 case 'k': binattr = AT_BLINK; break; 283 case 's': binattr = AT_STANDOUT; break; 284 case 'u': binattr = AT_UNDERLINE; break; 285 default: binattr = AT_NORMAL; break; 286 } 287 s += 2; 288 } 289 *fmtvarptr = s; 290 } 291 292 /* 293 * 294 */ 295 static void 296 set_charset(void) 297 { 298 char *s; 299 300 /* 301 * See if environment variable LESSCHARSET is defined. 302 */ 303 s = lgetenv("LESSCHARSET"); 304 if (icharset(s, 0)) 305 return; 306 307 /* 308 * LESSCHARSET is not defined: try LESSCHARDEF. 309 */ 310 s = lgetenv("LESSCHARDEF"); 311 if (s != NULL && *s != '\0') 312 { 313 ichardef(s); 314 return; 315 } 316 317 #if HAVE_LOCALE 318 #ifdef CODESET 319 /* 320 * Try using the codeset name as the charset name. 321 */ 322 s = nl_langinfo(CODESET); 323 if (icharset(s, 1)) 324 return; 325 #endif 326 #endif 327 328 #if HAVE_STRSTR 329 /* 330 * Check whether LC_ALL, LC_CTYPE or LANG look like UTF-8 is used. 331 */ 332 if ((s = lgetenv("LC_ALL")) != NULL || 333 (s = lgetenv("LC_CTYPE")) != NULL || 334 (s = lgetenv("LANG")) != NULL) 335 { 336 if ( strstr(s, "UTF-8") != NULL || strstr(s, "utf-8") != NULL 337 || strstr(s, "UTF8") != NULL || strstr(s, "utf8") != NULL) 338 if (icharset("utf-8", 1)) 339 return; 340 } 341 #endif 342 343 #if HAVE_LOCALE 344 /* 345 * Get character definitions from locale functions, 346 * rather than from predefined charset entry. 347 */ 348 ilocale(); 349 #if MSDOS_COMPILER 350 /* 351 * Default to "dos". 352 */ 353 (void) icharset("dos", 1); 354 #else 355 /* 356 * Default to "latin1". 357 */ 358 (void) icharset("latin1", 1); 359 #endif 360 #endif 361 } 362 363 /* 364 * Initialize charset data structures. 365 */ 366 public void 367 init_charset(void) 368 { 369 char *s; 370 371 #if HAVE_LOCALE 372 setlocale(LC_ALL, ""); 373 #endif 374 375 set_charset(); 376 377 s = lgetenv("LESSBINFMT"); 378 setbinfmt(s, &binfmt, "*s<%02X>"); 379 380 s = lgetenv("LESSUTFBINFMT"); 381 setbinfmt(s, &utfbinfmt, "<U+%04lX>"); 382 } 383 384 /* 385 * Is a given character a "binary" character? 386 */ 387 public int 388 binary_char(LWCHAR c) 389 { 390 if (utf_mode) 391 return (is_ubin_char(c)); 392 c &= 0377; 393 return (chardef[c] & IS_BINARY_CHAR); 394 } 395 396 /* 397 * Is a given character a "control" character? 398 */ 399 public int 400 control_char(LWCHAR c) 401 { 402 c &= 0377; 403 return (chardef[c] & IS_CONTROL_CHAR); 404 } 405 406 /* 407 * Return the printable form of a character. 408 * For example, in the "ascii" charset '\3' is printed as "^C". 409 */ 410 public char * 411 prchar(LWCHAR c) 412 { 413 /* {{ This buffer can be overrun if LESSBINFMT is a long string. }} */ 414 static char buf[32]; 415 416 c &= 0377; 417 if ((c < 128 || !utf_mode) && !control_char(c)) 418 SNPRINTF1(buf, sizeof(buf), "%c", (int) c); 419 else if (c == ESC) 420 strcpy(buf, "ESC"); 421 #if IS_EBCDIC_HOST 422 else if (!binary_char(c) && c < 64) 423 SNPRINTF1(buf, sizeof(buf), "^%c", 424 /* 425 * This array roughly inverts CONTROL() #defined in less.h, 426 * and should be kept in sync with CONTROL() and IBM-1047. 427 */ 428 "@ABC.I.?...KLMNO" 429 "PQRS.JH.XY.." 430 "\\]^_" 431 "......W[.....EFG" 432 "..V....D....TU.Z"[c]); 433 #else 434 else if (c < 128 && !control_char(c ^ 0100)) 435 SNPRINTF1(buf, sizeof(buf), "^%c", (int) (c ^ 0100)); 436 #endif 437 else 438 SNPRINTF1(buf, sizeof(buf), binfmt, c); 439 return (buf); 440 } 441 442 /* 443 * Return the printable form of a UTF-8 character. 444 */ 445 public char * 446 prutfchar(LWCHAR ch) 447 { 448 static char buf[32]; 449 450 if (ch == ESC) 451 strcpy(buf, "ESC"); 452 else if (ch < 128 && control_char(ch)) 453 { 454 if (!control_char(ch ^ 0100)) 455 SNPRINTF1(buf, sizeof(buf), "^%c", ((char) ch) ^ 0100); 456 else 457 SNPRINTF1(buf, sizeof(buf), binfmt, (char) ch); 458 } else if (is_ubin_char(ch)) 459 { 460 SNPRINTF1(buf, sizeof(buf), utfbinfmt, ch); 461 } else 462 { 463 char *p = buf; 464 if (ch >= 0x80000000) 465 ch = 0xFFFD; /* REPLACEMENT CHARACTER */ 466 put_wchar(&p, ch); 467 *p = '\0'; 468 } 469 return (buf); 470 } 471 472 /* 473 * Get the length of a UTF-8 character in bytes. 474 */ 475 public int 476 utf_len(char ch) 477 { 478 if ((ch & 0x80) == 0) 479 return 1; 480 if ((ch & 0xE0) == 0xC0) 481 return 2; 482 if ((ch & 0xF0) == 0xE0) 483 return 3; 484 if ((ch & 0xF8) == 0xF0) 485 return 4; 486 if ((ch & 0xFC) == 0xF8) 487 return 5; 488 if ((ch & 0xFE) == 0xFC) 489 return 6; 490 /* Invalid UTF-8 encoding. */ 491 return 1; 492 } 493 494 /* 495 * Does the parameter point to the lead byte of a well-formed UTF-8 character? 496 */ 497 public int 498 is_utf8_well_formed(unsigned char *s, int slen) 499 { 500 int i; 501 int len; 502 503 if (IS_UTF8_INVALID(s[0])) 504 return (0); 505 506 len = utf_len((char) s[0]); 507 if (len > slen) 508 return (0); 509 if (len == 1) 510 return (1); 511 if (len == 2) 512 { 513 if (s[0] < 0xC2) 514 return (0); 515 } else 516 { 517 unsigned char mask; 518 mask = (~((1 << (8-len)) - 1)) & 0xFF; 519 if (s[0] == mask && (s[1] & mask) == 0x80) 520 return (0); 521 } 522 523 for (i = 1; i < len; i++) 524 if (!IS_UTF8_TRAIL(s[i])) 525 return (0); 526 return (1); 527 } 528 529 /* 530 * Return number of invalid UTF-8 sequences found in a buffer. 531 */ 532 public int 533 utf_bin_count(unsigned char *data, int len) 534 { 535 int bin_count = 0; 536 while (len > 0) 537 { 538 if (is_utf8_well_formed(data, len)) 539 { 540 int clen = utf_len(*data); 541 data += clen; 542 len -= clen; 543 } else 544 { 545 /* Skip to next lead byte. */ 546 bin_count++; 547 do { 548 ++data; 549 --len; 550 } while (len > 0 && !IS_UTF8_LEAD(*data)); 551 } 552 } 553 return (bin_count); 554 } 555 556 /* 557 * Get the value of a UTF-8 character. 558 */ 559 public LWCHAR 560 get_wchar(constant char *p) 561 { 562 switch (utf_len(p[0])) 563 { 564 case 1: 565 default: 566 /* 0xxxxxxx */ 567 return (LWCHAR) 568 (p[0] & 0xFF); 569 case 2: 570 /* 110xxxxx 10xxxxxx */ 571 return (LWCHAR) ( 572 ((p[0] & 0x1F) << 6) | 573 (p[1] & 0x3F)); 574 case 3: 575 /* 1110xxxx 10xxxxxx 10xxxxxx */ 576 return (LWCHAR) ( 577 ((p[0] & 0x0F) << 12) | 578 ((p[1] & 0x3F) << 6) | 579 (p[2] & 0x3F)); 580 case 4: 581 /* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ 582 return (LWCHAR) ( 583 ((p[0] & 0x07) << 18) | 584 ((p[1] & 0x3F) << 12) | 585 ((p[2] & 0x3F) << 6) | 586 (p[3] & 0x3F)); 587 case 5: 588 /* 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ 589 return (LWCHAR) ( 590 ((p[0] & 0x03) << 24) | 591 ((p[1] & 0x3F) << 18) | 592 ((p[2] & 0x3F) << 12) | 593 ((p[3] & 0x3F) << 6) | 594 (p[4] & 0x3F)); 595 case 6: 596 /* 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ 597 return (LWCHAR) ( 598 ((p[0] & 0x01) << 30) | 599 ((p[1] & 0x3F) << 24) | 600 ((p[2] & 0x3F) << 18) | 601 ((p[3] & 0x3F) << 12) | 602 ((p[4] & 0x3F) << 6) | 603 (p[5] & 0x3F)); 604 } 605 } 606 607 /* 608 * Store a character into a UTF-8 string. 609 */ 610 public void 611 put_wchar(char **pp, LWCHAR ch) 612 { 613 if (!utf_mode || ch < 0x80) 614 { 615 /* 0xxxxxxx */ 616 *(*pp)++ = (char) ch; 617 } else if (ch < 0x800) 618 { 619 /* 110xxxxx 10xxxxxx */ 620 *(*pp)++ = (char) (0xC0 | ((ch >> 6) & 0x1F)); 621 *(*pp)++ = (char) (0x80 | (ch & 0x3F)); 622 } else if (ch < 0x10000) 623 { 624 /* 1110xxxx 10xxxxxx 10xxxxxx */ 625 *(*pp)++ = (char) (0xE0 | ((ch >> 12) & 0x0F)); 626 *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); 627 *(*pp)++ = (char) (0x80 | (ch & 0x3F)); 628 } else if (ch < 0x200000) 629 { 630 /* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ 631 *(*pp)++ = (char) (0xF0 | ((ch >> 18) & 0x07)); 632 *(*pp)++ = (char) (0x80 | ((ch >> 12) & 0x3F)); 633 *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); 634 *(*pp)++ = (char) (0x80 | (ch & 0x3F)); 635 } else if (ch < 0x4000000) 636 { 637 /* 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ 638 *(*pp)++ = (char) (0xF0 | ((ch >> 24) & 0x03)); 639 *(*pp)++ = (char) (0x80 | ((ch >> 18) & 0x3F)); 640 *(*pp)++ = (char) (0x80 | ((ch >> 12) & 0x3F)); 641 *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); 642 *(*pp)++ = (char) (0x80 | (ch & 0x3F)); 643 } else 644 { 645 /* 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ 646 *(*pp)++ = (char) (0xF0 | ((ch >> 30) & 0x01)); 647 *(*pp)++ = (char) (0x80 | ((ch >> 24) & 0x3F)); 648 *(*pp)++ = (char) (0x80 | ((ch >> 18) & 0x3F)); 649 *(*pp)++ = (char) (0x80 | ((ch >> 12) & 0x3F)); 650 *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); 651 *(*pp)++ = (char) (0x80 | (ch & 0x3F)); 652 } 653 } 654 655 /* 656 * Step forward or backward one character in a string. 657 */ 658 public LWCHAR 659 step_char(constant char **pp, signed int dir, constant char *limit) 660 { 661 LWCHAR ch; 662 int len; 663 constant char *p = *pp; 664 665 if (!utf_mode) 666 { 667 /* It's easy if chars are one byte. */ 668 if (dir > 0) 669 ch = (LWCHAR) ((p < limit) ? *p++ : 0); 670 else 671 ch = (LWCHAR) ((p > limit) ? *--p : 0); 672 } else if (dir > 0) 673 { 674 len = utf_len(*p); 675 if (p + len > limit) 676 { 677 ch = 0; 678 p = limit; 679 } else 680 { 681 ch = get_wchar(p); 682 p += len; 683 } 684 } else 685 { 686 while (p > limit && IS_UTF8_TRAIL(p[-1])) 687 p--; 688 if (p > limit) 689 ch = get_wchar(--p); 690 else 691 ch = 0; 692 } 693 *pp = p; 694 return ch; 695 } 696 697 /* 698 * Unicode characters data 699 * Actual data is in the generated *.uni files. 700 */ 701 702 #define DECLARE_RANGE_TABLE_START(name) \ 703 static struct wchar_range name##_array[] = { 704 #define DECLARE_RANGE_TABLE_END(name) \ 705 }; struct wchar_range_table name##_table = { name##_array, sizeof(name##_array)/sizeof(*name##_array) }; 706 707 DECLARE_RANGE_TABLE_START(compose) 708 #include "compose.uni" 709 DECLARE_RANGE_TABLE_END(compose) 710 711 DECLARE_RANGE_TABLE_START(ubin) 712 #include "ubin.uni" 713 DECLARE_RANGE_TABLE_END(ubin) 714 715 DECLARE_RANGE_TABLE_START(wide) 716 #include "wide.uni" 717 DECLARE_RANGE_TABLE_END(wide) 718 719 /* comb_table is special pairs, not ranges. */ 720 static struct wchar_range comb_table[] = { 721 {0x0644,0x0622}, {0x0644,0x0623}, {0x0644,0x0625}, {0x0644,0x0627}, 722 }; 723 724 725 static int 726 is_in_table(LWCHAR ch, struct wchar_range_table *table) 727 { 728 int hi; 729 int lo; 730 731 /* Binary search in the table. */ 732 if (ch < table->table[0].first) 733 return 0; 734 lo = 0; 735 hi = table->count - 1; 736 while (lo <= hi) 737 { 738 int mid = (lo + hi) / 2; 739 if (ch > table->table[mid].last) 740 lo = mid + 1; 741 else if (ch < table->table[mid].first) 742 hi = mid - 1; 743 else 744 return 1; 745 } 746 return 0; 747 } 748 749 /* 750 * Is a character a UTF-8 composing character? 751 * If a composing character follows any char, the two combine into one glyph. 752 */ 753 public int 754 is_composing_char(LWCHAR ch) 755 { 756 return is_in_table(ch, &compose_table); 757 } 758 759 /* 760 * Should this UTF-8 character be treated as binary? 761 */ 762 public int 763 is_ubin_char(LWCHAR ch) 764 { 765 return is_in_table(ch, &ubin_table); 766 } 767 768 /* 769 * Is this a double width UTF-8 character? 770 */ 771 public int 772 is_wide_char(LWCHAR ch) 773 { 774 return is_in_table(ch, &wide_table); 775 } 776 777 /* 778 * Is a character a UTF-8 combining character? 779 * A combining char acts like an ordinary char, but if it follows 780 * a specific char (not any char), the two combine into one glyph. 781 */ 782 public int 783 is_combining_char(LWCHAR ch1, LWCHAR ch2) 784 { 785 /* The table is small; use linear search. */ 786 int i; 787 for (i = 0; i < sizeof(comb_table)/sizeof(*comb_table); i++) 788 { 789 if (ch1 == comb_table[i].first && 790 ch2 == comb_table[i].last) 791 return 1; 792 } 793 return 0; 794 } 795 796