1 /* 2 * Copyright (C) 1984-2025 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 #include "xbuf.h" 25 26 #if MSDOS_COMPILER==WIN32C 27 #define WIN32_LEAN_AND_MEAN 28 #include <windows.h> 29 #endif 30 31 extern int bs_mode; 32 33 public int utf_mode = 0; 34 35 /* 36 * Predefined character sets, 37 * selected by the LESSCHARSET environment variable. 38 */ 39 struct charset { 40 char *name; 41 int *p_flag; 42 char *desc; 43 } charsets[] = { 44 { "ascii", NULL, "8bcccbcc18b95.b" }, 45 { "utf-8", &utf_mode, "8bcccbcc18b95.b126.bb" }, 46 { "iso8859", NULL, "8bcccbcc18b95.33b." }, 47 { "latin3", NULL, "8bcccbcc18b95.33b5.b8.b15.b4.b12.b18.b12.b." }, 48 { "arabic", NULL, "8bcccbcc18b95.33b.3b.7b2.13b.3b.b26.5b19.b" }, 49 { "greek", NULL, "8bcccbcc18b95.33b4.2b4.b3.b35.b44.b" }, 50 { "greek2005", NULL, "8bcccbcc18b95.33b14.b35.b44.b" }, 51 { "hebrew", NULL, "8bcccbcc18b95.33b.b29.32b28.2b2.b" }, 52 { "koi8-r", NULL, "8bcccbcc18b95.b." }, 53 { "KOI8-T", NULL, "8bcccbcc18b95.b8.b6.b8.b.b.5b7.3b4.b4.b3.b.b.3b." }, 54 { "georgianps", NULL, "8bcccbcc18b95.3b11.4b12.2b." }, 55 { "tcvn", NULL, "b..b...bcccbccbbb7.8b95.b48.5b." }, 56 { "TIS-620", NULL, "8bcccbcc18b95.b.4b.11b7.8b." }, 57 { "next", NULL, "8bcccbcc18b95.bb125.bb" }, 58 { "dos", NULL, "8bcccbcc12bc5b95.b." }, 59 { "windows-1251", NULL, "8bcccbcc12bc5b95.b24.b." }, 60 { "windows-1252", NULL, "8bcccbcc12bc5b95.b.b11.b.2b12.b." }, 61 { "windows-1255", NULL, "8bcccbcc12bc5b95.b.b8.b.5b9.b.4b." }, 62 { "ebcdic", NULL, "5bc6bcc7bcc41b.9b7.9b5.b..8b6.10b6.b9.7b9.8b8.17b3.3b9.7b9.8b8.6b10.b.b.b." }, 63 { "IBM-1047", NULL, "4cbcbc3b9cbccbccbb4c6bcc5b3cbbc4bc4bccbc191.b" }, 64 { NULL, NULL, NULL } 65 }; 66 67 /* 68 * Support "locale charmap"/nl_langinfo(CODESET) values, as well as others. 69 */ 70 struct cs_alias { 71 char *name; 72 char *oname; 73 } cs_aliases[] = { 74 { "UTF-8", "utf-8" }, 75 { "utf8", "utf-8" }, 76 { "UTF8", "utf-8" }, 77 { "ANSI_X3.4-1968", "ascii" }, 78 { "US-ASCII", "ascii" }, 79 { "latin1", "iso8859" }, 80 { "ISO-8859-1", "iso8859" }, 81 { "latin9", "iso8859" }, 82 { "ISO-8859-15", "iso8859" }, 83 { "latin2", "iso8859" }, 84 { "ISO-8859-2", "iso8859" }, 85 { "ISO-8859-3", "latin3" }, 86 { "latin4", "iso8859" }, 87 { "ISO-8859-4", "iso8859" }, 88 { "cyrillic", "iso8859" }, 89 { "ISO-8859-5", "iso8859" }, 90 { "ISO-8859-6", "arabic" }, 91 { "ISO-8859-7", "greek" }, 92 { "IBM9005", "greek2005" }, 93 { "ISO-8859-8", "hebrew" }, 94 { "latin5", "iso8859" }, 95 { "ISO-8859-9", "iso8859" }, 96 { "latin6", "iso8859" }, 97 { "ISO-8859-10", "iso8859" }, 98 { "latin7", "iso8859" }, 99 { "ISO-8859-13", "iso8859" }, 100 { "latin8", "iso8859" }, 101 { "ISO-8859-14", "iso8859" }, 102 { "latin10", "iso8859" }, 103 { "ISO-8859-16", "iso8859" }, 104 { "IBM437", "dos" }, 105 { "EBCDIC-US", "ebcdic" }, 106 { "IBM1047", "IBM-1047" }, 107 { "KOI8-R", "koi8-r" }, 108 { "KOI8-U", "koi8-r" }, 109 { "GEORGIAN-PS", "georgianps" }, 110 { "TCVN5712-1", "tcvn" }, 111 { "NEXTSTEP", "next" }, 112 { "windows", "windows-1252" }, /* backward compatibility */ 113 { "CP1251", "windows-1251" }, 114 { "CP1252", "windows-1252" }, 115 { "CP1255", "windows-1255" }, 116 { NULL, NULL } 117 }; 118 119 #define IS_BINARY_CHAR 01 120 #define IS_CONTROL_CHAR 02 121 122 static char chardef[256]; 123 static constant char *binfmt = NULL; 124 static constant char *utfbinfmt = NULL; 125 public int binattr = AT_STANDOUT|AT_COLOR_BIN; 126 127 static struct xbuffer user_wide_array; 128 static struct xbuffer user_ubin_array; 129 static struct xbuffer user_compose_array; 130 static struct xbuffer user_prt_array; 131 static struct xbuffer user_omit_array; 132 static struct wchar_range_table user_wide_table; 133 static struct wchar_range_table user_ubin_table; 134 static struct wchar_range_table user_compose_table; 135 static struct wchar_range_table user_prt_table; 136 static struct wchar_range_table user_omit_table; 137 138 /* 139 * Set a wchar_range_table to the table in an xbuffer. 140 */ 141 static void wchar_range_table_set(struct wchar_range_table *tbl, struct xbuffer *arr) 142 { 143 tbl->table = (struct wchar_range *) arr->data; 144 tbl->count = (unsigned int) (arr->end / sizeof(struct wchar_range)); 145 } 146 147 /* 148 * Skip over a "U" or "U+" prefix before a hex codepoint. 149 */ 150 static constant char * skip_uprefix(constant char *s) 151 { 152 if (*s == 'U' || *s == 'u') 153 if (*++s == '+') ++s; 154 return s; 155 } 156 157 /* 158 * Parse a dash-separated range of hex values. 159 */ 160 static void wchar_range_get(constant char **ss, struct wchar_range *range) 161 { 162 constant char *s = skip_uprefix(*ss); 163 range->first = lstrtoulc(s, &s, 16); 164 if (s[0] == '-') 165 { 166 s = skip_uprefix(&s[1]); 167 range->last = lstrtoulc(s, &s, 16); 168 } else 169 { 170 range->last = range->first; 171 } 172 *ss = s; 173 } 174 175 /* 176 * Parse the LESSUTFCHARDEF variable. 177 */ 178 static void ichardef_utf(constant char *s) 179 { 180 xbuf_init(&user_wide_array); 181 xbuf_init(&user_ubin_array); 182 xbuf_init(&user_compose_array); 183 xbuf_init(&user_prt_array); 184 xbuf_init(&user_omit_array); 185 186 if (s != NULL) 187 { 188 while (s[0] != '\0') 189 { 190 struct wchar_range range; 191 wchar_range_get(&s, &range); 192 if (range.last == 0) 193 { 194 error("invalid hex number(s) in LESSUTFCHARDEF", NULL_PARG); 195 quit(QUIT_ERROR); 196 } 197 if (*s++ != ':') 198 { 199 error("missing colon in LESSUTFCHARDEF", NULL_PARG); 200 quit(QUIT_ERROR); 201 } 202 switch (*s++) 203 { 204 case 'b': 205 xbuf_add_data(&user_ubin_array, (unsigned char *) &range, sizeof(range)); 206 break; 207 case 'c': 208 xbuf_add_data(&user_compose_array, (unsigned char *) &range, sizeof(range)); 209 break; 210 case 'd': 211 xbuf_add_data(&user_omit_array, (unsigned char *) &range, sizeof(range)); 212 break; 213 case 'w': 214 xbuf_add_data(&user_wide_array, (unsigned char *) &range, sizeof(range)); 215 xbuf_add_data(&user_prt_array, (unsigned char *) &range, sizeof(range)); 216 break; 217 case 'p': case '.': 218 xbuf_add_data(&user_prt_array, (unsigned char *) &range, sizeof(range)); 219 break; 220 case '\0': 221 s--; 222 break; 223 default: 224 /* Ignore unknown character attribute. */ 225 break; 226 } 227 if (s[0] == ',') ++s; 228 } 229 } 230 wchar_range_table_set(&user_wide_table, &user_wide_array); 231 wchar_range_table_set(&user_ubin_table, &user_ubin_array); 232 wchar_range_table_set(&user_compose_table, &user_compose_array); 233 wchar_range_table_set(&user_prt_table, &user_prt_array); 234 wchar_range_table_set(&user_omit_table, &user_omit_array); 235 } 236 237 /* 238 * Define a charset, given a description string. 239 * The string consists of 256 letters, 240 * one for each character in the charset. 241 * If the string is shorter than 256 letters, missing letters 242 * are taken to be identical to the last one. 243 * A decimal number followed by a letter is taken to be a 244 * repetition of the letter. 245 * 246 * Each letter is one of: 247 * . normal character 248 * b binary character 249 * c control character 250 */ 251 static void ichardef(constant char *s) 252 { 253 char *cp; 254 int n; 255 char v; 256 257 n = 0; 258 v = 0; 259 cp = chardef; 260 while (*s != '\0') 261 { 262 switch (*s++) 263 { 264 case '.': 265 v = 0; 266 break; 267 case 'c': 268 v = IS_CONTROL_CHAR; 269 break; 270 case 'b': 271 v = IS_BINARY_CHAR|IS_CONTROL_CHAR; 272 break; 273 274 case '0': case '1': case '2': case '3': case '4': 275 case '5': case '6': case '7': case '8': case '9': 276 if (ckd_mul(&n, n, 10) || ckd_add(&n, n, s[-1] - '0')) 277 goto invalid_chardef; 278 continue; 279 280 default: 281 invalid_chardef: 282 error("invalid chardef", NULL_PARG); 283 quit(QUIT_ERROR); 284 /*NOTREACHED*/ 285 } 286 287 do 288 { 289 if (cp >= chardef + sizeof(chardef)) 290 { 291 error("chardef longer than 256", NULL_PARG); 292 quit(QUIT_ERROR); 293 /*NOTREACHED*/ 294 } 295 *cp++ = v; 296 } while (--n > 0); 297 n = 0; 298 } 299 300 while (cp < chardef + sizeof(chardef)) 301 *cp++ = v; 302 } 303 304 /* 305 * Define a charset, given a charset name. 306 * The valid charset names are listed in the "charsets" array. 307 */ 308 static int icharset(constant char *name, int no_error) 309 { 310 struct charset *p; 311 struct cs_alias *a; 312 313 if (name == NULL || *name == '\0') 314 return (0); 315 316 /* First see if the name is an alias. */ 317 for (a = cs_aliases; a->name != NULL; a++) 318 { 319 if (strcmp(name, a->name) == 0) 320 { 321 name = a->oname; 322 break; 323 } 324 } 325 326 for (p = charsets; p->name != NULL; p++) 327 { 328 if (strcmp(name, p->name) == 0) 329 { 330 ichardef(p->desc); 331 if (p->p_flag != NULL) 332 { 333 #if MSDOS_COMPILER==WIN32C 334 *(p->p_flag) = 1 + (GetConsoleOutputCP() != CP_UTF8); 335 #else 336 *(p->p_flag) = 1; 337 #endif 338 } 339 return (1); 340 } 341 } 342 343 if (!no_error) { 344 error("invalid charset name", NULL_PARG); 345 quit(QUIT_ERROR); 346 } 347 return (0); 348 } 349 350 #if HAVE_LOCALE 351 /* 352 * Define a charset, given a locale name. 353 */ 354 static void ilocale(void) 355 { 356 int c; 357 358 for (c = 0; c < (int) sizeof(chardef); c++) 359 { 360 if (isprint(c)) 361 chardef[c] = 0; 362 else if (iscntrl(c)) 363 chardef[c] = IS_CONTROL_CHAR; 364 else 365 chardef[c] = IS_BINARY_CHAR|IS_CONTROL_CHAR; 366 } 367 } 368 #endif 369 370 /* 371 * Define the printing format for control (or binary utf) chars. 372 */ 373 public void setfmt(constant char *s, constant char **fmtvarptr, int *attrptr, constant char *default_fmt, lbool for_printf) 374 { 375 if (s == NULL || *s == '\0') 376 s = default_fmt; 377 else if (for_printf && 378 ((*s == '*' && (s[1] == '\0' || s[2] == '\0' || strchr(s + 2, 'n'))) || 379 (*s != '*' && strchr(s, 'n')))) 380 /* %n is evil */ 381 s = default_fmt; 382 383 /* 384 * Select the attributes if it starts with "*". 385 */ 386 if (*s == '*' && s[1] != '\0') 387 { 388 switch (s[1]) 389 { 390 case 'd': *attrptr = AT_BOLD; break; 391 case 'k': *attrptr = AT_BLINK; break; 392 case 's': *attrptr = AT_STANDOUT; break; 393 case 'u': *attrptr = AT_UNDERLINE; break; 394 default: *attrptr = AT_NORMAL; break; 395 } 396 s += 2; 397 } 398 *fmtvarptr = s; 399 } 400 401 /* 402 * 403 */ 404 static void set_charset(void) 405 { 406 constant char *s; 407 408 ichardef_utf(lgetenv("LESSUTFCHARDEF")); 409 410 /* 411 * See if environment variable LESSCHARSET is defined. 412 */ 413 s = lgetenv("LESSCHARSET"); 414 if (icharset(s, 0)) 415 return; 416 417 /* 418 * LESSCHARSET is not defined: try LESSCHARDEF. 419 */ 420 s = lgetenv("LESSCHARDEF"); 421 if (!isnullenv(s)) 422 { 423 ichardef(s); 424 return; 425 } 426 427 #if HAVE_LOCALE 428 #ifdef CODESET 429 /* 430 * Try using the codeset name as the charset name. 431 */ 432 s = nl_langinfo(CODESET); 433 if (icharset(s, 1)) 434 return; 435 #endif 436 #endif 437 438 #if HAVE_STRSTR 439 /* 440 * Check whether LC_ALL, LC_CTYPE or LANG look like UTF-8 is used. 441 */ 442 if ((s = lgetenv("LC_ALL")) != NULL || 443 (s = lgetenv("LC_CTYPE")) != NULL || 444 (s = lgetenv("LANG")) != NULL) 445 { 446 if ( strstr(s, "UTF-8") != NULL || strstr(s, "utf-8") != NULL 447 || strstr(s, "UTF8") != NULL || strstr(s, "utf8") != NULL) 448 if (icharset("utf-8", 1)) 449 return; 450 } 451 #endif 452 453 #if HAVE_LOCALE 454 /* 455 * Get character definitions from locale functions, 456 * rather than from predefined charset entry. 457 */ 458 ilocale(); 459 #else 460 #if MSDOS_COMPILER 461 #if MSDOS_COMPILER==WIN32C 462 (void) icharset("utf-8", 1); 463 #else 464 (void) icharset("dos", 1); 465 #endif 466 #else 467 (void) icharset("utf-8", 1); 468 #endif 469 #endif 470 } 471 472 /* 473 * Initialize charset data structures. 474 */ 475 public void init_charset(void) 476 { 477 constant char *s; 478 479 #if HAVE_LOCALE 480 setlocale(LC_ALL, ""); 481 #endif 482 483 set_charset(); 484 485 s = lgetenv("LESSBINFMT"); 486 setfmt(s, &binfmt, &binattr, "*s<%02X>", TRUE); 487 488 s = lgetenv("LESSUTFBINFMT"); 489 setfmt(s, &utfbinfmt, &binattr, "<U+%04lX>", TRUE); 490 } 491 492 /* 493 * Is a given character a "binary" character? 494 */ 495 public lbool binary_char(LWCHAR c) 496 { 497 if (utf_mode) 498 return (is_ubin_char(c)); 499 if (c >= sizeof(chardef)) 500 return TRUE; 501 return ((chardef[c] & IS_BINARY_CHAR) != 0); 502 } 503 504 /* 505 * Is a given character a "control" character? 506 */ 507 public lbool control_char(LWCHAR c) 508 { 509 if (c >= sizeof(chardef)) 510 return TRUE; 511 return (chardef[c] & IS_CONTROL_CHAR); 512 } 513 514 /* 515 * Return the printable form of a character. 516 * For example, in the "ascii" charset '\3' is printed as "^C". 517 */ 518 public constant char * prchar(LWCHAR c) 519 { 520 /* {{ Fixed buffer size means LESSBINFMT etc can be truncated. }} */ 521 static char buf[MAX_PRCHAR_LEN+1]; 522 523 c &= 0377; /*{{type-issue}}*/ 524 if ((c < 128 || !utf_mode) && !control_char(c)) 525 SNPRINTF1(buf, sizeof(buf), "%c", (int) c); 526 else if (c == ESC) 527 strcpy(buf, "ESC"); 528 #if IS_EBCDIC_HOST 529 else if (!binary_char(c) && c < 64) 530 SNPRINTF1(buf, sizeof(buf), "^%c", 531 /* 532 * This array roughly inverts CONTROL() #defined in less.h, 533 * and should be kept in sync with CONTROL() and IBM-1047. 534 */ 535 "@ABC.I.?...KLMNO" 536 "PQRS.JH.XY.." 537 "\\]^_" 538 "......W[.....EFG" 539 "..V....D....TU.Z"[c]); 540 #else 541 else if (c < 128 && !control_char(c ^ 0100)) 542 SNPRINTF1(buf, sizeof(buf), "^%c", (int) (c ^ 0100)); 543 #endif 544 else 545 SNPRINTF1(buf, sizeof(buf), binfmt, c); 546 return (buf); 547 } 548 549 /* 550 * Return the printable form of a UTF-8 character. 551 */ 552 public constant char * prutfchar(LWCHAR ch) 553 { 554 static char buf[MAX_PRCHAR_LEN+1]; 555 556 if (ch == ESC) 557 strcpy(buf, "ESC"); 558 else if (ch < 128 && control_char(ch)) 559 { 560 if (!control_char(ch ^ 0100)) 561 SNPRINTF1(buf, sizeof(buf), "^%c", ((char) ch) ^ 0100); 562 else 563 SNPRINTF1(buf, sizeof(buf), binfmt, (char) ch); 564 } else if (is_ubin_char(ch) || is_omit_char(ch)) 565 { 566 SNPRINTF1(buf, sizeof(buf), utfbinfmt, ch); 567 } else 568 { 569 char *p = buf; 570 if (ch >= 0x80000000) 571 ch = 0xFFFD; /* REPLACEMENT CHARACTER */ 572 put_wchar(&p, ch); 573 *p = '\0'; 574 } 575 return (buf); 576 } 577 578 /* 579 * Get the length of a UTF-8 character in bytes. 580 */ 581 public int utf_len(char ch) 582 { 583 if ((ch & 0x80) == 0) 584 return 1; 585 if ((ch & 0xE0) == 0xC0) 586 return 2; 587 if ((ch & 0xF0) == 0xE0) 588 return 3; 589 if ((ch & 0xF8) == 0xF0) 590 return 4; 591 #if 0 592 if ((ch & 0xFC) == 0xF8) 593 return 5; 594 if ((ch & 0xFE) == 0xFC) 595 return 6; 596 #endif 597 /* Invalid UTF-8 encoding. */ 598 return 1; 599 } 600 601 /* 602 * Does the parameter point to the lead byte of a well-formed UTF-8 character? 603 */ 604 public lbool is_utf8_well_formed(constant char *ss, int slen) 605 { 606 int i; 607 int len; 608 unsigned char s0 = (unsigned char) ss[0]; 609 610 if (IS_UTF8_INVALID(s0)) 611 return (FALSE); 612 613 len = utf_len(ss[0]); 614 if (len > slen) 615 return (FALSE); 616 if (len == 1) 617 return (TRUE); 618 if (len == 2) 619 { 620 if (s0 < 0xC2) 621 return (FALSE); 622 } else 623 { 624 unsigned char mask = (unsigned char) (~((1 << (8-len)) - 1)); 625 if (s0 == mask && (ss[1] & mask) == 0x80) 626 return (FALSE); 627 } 628 629 for (i = 1; i < len; i++) 630 if (!IS_UTF8_TRAIL(ss[i])) 631 return (FALSE); 632 return (TRUE); 633 } 634 635 /* 636 * Skip bytes until a UTF-8 lead byte (11xxxxxx) or ASCII byte (0xxxxxxx) is found. 637 */ 638 public void utf_skip_to_lead(constant char **pp, constant char *limit) 639 { 640 do { 641 ++(*pp); 642 } while (*pp < limit && !IS_UTF8_LEAD((*pp)[0] & 0377) && !IS_ASCII_OCTET((*pp)[0])); 643 } 644 645 646 /* 647 * Get the value of a UTF-8 character. 648 */ 649 public LWCHAR get_wchar(constant char *sp) 650 { 651 constant unsigned char *p = (constant unsigned char *) sp; 652 switch (utf_len(sp[0])) 653 { 654 case 1: 655 default: 656 /* 0xxxxxxx */ 657 return (LWCHAR) 658 (p[0] & 0xFF); 659 case 2: 660 /* 110xxxxx 10xxxxxx */ 661 return (LWCHAR) ( 662 ((p[0] & 0x1F) << 6) | 663 (p[1] & 0x3F)); 664 case 3: 665 /* 1110xxxx 10xxxxxx 10xxxxxx */ 666 return (LWCHAR) ( 667 ((p[0] & 0x0F) << 12) | 668 ((p[1] & 0x3F) << 6) | 669 (p[2] & 0x3F)); 670 case 4: 671 /* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ 672 return (LWCHAR) ( 673 ((p[0] & 0x07) << 18) | 674 ((p[1] & 0x3F) << 12) | 675 ((p[2] & 0x3F) << 6) | 676 (p[3] & 0x3F)); 677 #if 0 678 case 5: 679 /* 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ 680 return (LWCHAR) ( 681 ((p[0] & 0x03) << 24) | 682 ((p[1] & 0x3F) << 18) | 683 ((p[2] & 0x3F) << 12) | 684 ((p[3] & 0x3F) << 6) | 685 (p[4] & 0x3F)); 686 case 6: 687 /* 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ 688 return (LWCHAR) ( 689 ((p[0] & 0x01) << 30) | 690 ((p[1] & 0x3F) << 24) | 691 ((p[2] & 0x3F) << 18) | 692 ((p[3] & 0x3F) << 12) | 693 ((p[4] & 0x3F) << 6) | 694 (p[5] & 0x3F)); 695 #endif 696 } 697 } 698 699 /* 700 * Store a character into a UTF-8 string. 701 */ 702 public void put_wchar(mutable char **pp, LWCHAR ch) 703 { 704 if (!utf_mode || ch < 0x80) 705 { 706 /* 0xxxxxxx */ 707 *(*pp)++ = (char) ch; 708 } else if (ch < 0x800) 709 { 710 /* 110xxxxx 10xxxxxx */ 711 *(*pp)++ = (char) (0xC0 | ((ch >> 6) & 0x1F)); 712 *(*pp)++ = (char) (0x80 | (ch & 0x3F)); 713 } else if (ch < 0x10000) 714 { 715 /* 1110xxxx 10xxxxxx 10xxxxxx */ 716 *(*pp)++ = (char) (0xE0 | ((ch >> 12) & 0x0F)); 717 *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); 718 *(*pp)++ = (char) (0x80 | (ch & 0x3F)); 719 } else if (ch < 0x200000) 720 { 721 /* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ 722 *(*pp)++ = (char) (0xF0 | ((ch >> 18) & 0x07)); 723 *(*pp)++ = (char) (0x80 | ((ch >> 12) & 0x3F)); 724 *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); 725 *(*pp)++ = (char) (0x80 | (ch & 0x3F)); 726 #if 0 727 } else if (ch < 0x4000000) 728 { 729 /* 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ 730 *(*pp)++ = (char) (0xF0 | ((ch >> 24) & 0x03)); 731 *(*pp)++ = (char) (0x80 | ((ch >> 18) & 0x3F)); 732 *(*pp)++ = (char) (0x80 | ((ch >> 12) & 0x3F)); 733 *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); 734 *(*pp)++ = (char) (0x80 | (ch & 0x3F)); 735 } else 736 { 737 /* 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx */ 738 *(*pp)++ = (char) (0xF0 | ((ch >> 30) & 0x01)); 739 *(*pp)++ = (char) (0x80 | ((ch >> 24) & 0x3F)); 740 *(*pp)++ = (char) (0x80 | ((ch >> 18) & 0x3F)); 741 *(*pp)++ = (char) (0x80 | ((ch >> 12) & 0x3F)); 742 *(*pp)++ = (char) (0x80 | ((ch >> 6) & 0x3F)); 743 *(*pp)++ = (char) (0x80 | (ch & 0x3F)); 744 #endif 745 } 746 } 747 748 /* 749 * Step forward or backward one character in a string. 750 */ 751 public LWCHAR step_charc(constant char **pp, signed int dir, constant char *limit) 752 { 753 LWCHAR ch; 754 int len; 755 constant char *p = *pp; 756 757 if (!utf_mode) 758 { 759 /* It's easy if chars are one byte. */ 760 if (dir > 0) 761 ch = (LWCHAR) (unsigned char) ((p < limit) ? *p++ : 0); 762 else 763 ch = (LWCHAR) (unsigned char) ((p > limit) ? *--p : 0); 764 } else if (dir > 0) 765 { 766 if (p >= limit) 767 ch = 0; 768 else 769 { 770 len = utf_len(*p); 771 if (p + len > limit || !is_utf8_well_formed(p, len)) 772 { 773 ch = (LWCHAR) (unsigned char) *p++; 774 } else 775 { 776 ch = get_wchar(p); 777 p += len; 778 } 779 } 780 } else 781 { 782 while (p > limit && IS_UTF8_TRAIL(p[-1])) 783 p--; 784 if (p <= limit) 785 ch = 0; 786 else 787 { 788 len = utf_len(*--p); 789 if (p + len != *pp || !is_utf8_well_formed(p, len)) 790 { 791 p = *pp - 1; 792 ch = (LWCHAR) (unsigned char) *p; 793 } else 794 { 795 ch = get_wchar(p); 796 } 797 } 798 } 799 *pp = p; 800 return ch; 801 } 802 803 public LWCHAR step_char(char **pp, signed int dir, constant char *limit) 804 { 805 constant char *p = (constant char *) *pp; 806 LWCHAR ch = step_charc(&p, dir, limit); 807 *pp = (char *) p; 808 return ch; 809 } 810 811 /* 812 * Unicode characters data 813 * Actual data is in the generated *.uni files. 814 */ 815 816 #define DECLARE_RANGE_TABLE_START(name) \ 817 static struct wchar_range name##_array[] = { 818 #define DECLARE_RANGE_TABLE_END(name) \ 819 }; struct wchar_range_table name##_table = { name##_array, countof(name##_array) }; 820 821 DECLARE_RANGE_TABLE_START(compose) 822 #include "compose.uni" 823 DECLARE_RANGE_TABLE_END(compose) 824 825 DECLARE_RANGE_TABLE_START(ubin) 826 #include "ubin.uni" 827 DECLARE_RANGE_TABLE_END(ubin) 828 829 DECLARE_RANGE_TABLE_START(wide) 830 #include "wide.uni" 831 DECLARE_RANGE_TABLE_END(wide) 832 833 DECLARE_RANGE_TABLE_START(fmt) 834 #include "fmt.uni" 835 DECLARE_RANGE_TABLE_END(fmt) 836 837 DECLARE_RANGE_TABLE_START(omit) 838 #include "omit.uni" 839 DECLARE_RANGE_TABLE_END(omit) 840 841 /* comb_table is special pairs, not ranges. */ 842 static struct wchar_range comb_table[] = { 843 {0x0644,0x0622}, {0x0644,0x0623}, {0x0644,0x0625}, {0x0644,0x0627}, 844 }; 845 846 847 static lbool is_in_table(LWCHAR ch, struct wchar_range_table *table) 848 { 849 unsigned int hi; 850 unsigned int lo; 851 852 /* Binary search in the table. */ 853 if (table->table == NULL || table->count == 0 || ch < table->table[0].first) 854 return FALSE; 855 lo = 0; 856 hi = table->count - 1; 857 while (lo <= hi) 858 { 859 unsigned int mid = (lo + hi) / 2; 860 if (ch > table->table[mid].last) 861 lo = mid + 1; 862 else if (ch < table->table[mid].first) 863 hi = mid - 1; 864 else 865 return TRUE; 866 } 867 return FALSE; 868 } 869 870 /* 871 * Is a character in none of a set of specified user tables? 872 */ 873 static lbool not_user_defined(LWCHAR ch, struct wchar_range_table *tbl1, struct wchar_range_table *tbl2, struct wchar_range_table *tbl3) 874 { 875 if (is_in_table(ch, tbl1)) return FALSE; 876 if (is_in_table(ch, tbl2)) return FALSE; 877 if (is_in_table(ch, tbl3)) return FALSE; 878 return TRUE; 879 } 880 881 /* 882 * Is a character a UTF-8 composing character? 883 * If a composing character follows any char, the two combine into one glyph. 884 */ 885 public lbool is_composing_char(LWCHAR ch) 886 { 887 if (is_in_table(ch, &user_prt_table)) return FALSE; 888 return is_in_table(ch, &user_compose_table) || 889 (is_in_table(ch, &compose_table) || 890 (bs_mode != BS_CONTROL && is_in_table(ch, &fmt_table) && 891 not_user_defined(ch, &user_prt_table, &user_ubin_table, &user_omit_table))); 892 } 893 894 /* 895 * Should this UTF-8 character be treated as binary? 896 */ 897 public lbool is_ubin_char(LWCHAR ch) 898 { 899 if (is_in_table(ch, &user_prt_table)) return FALSE; 900 return is_in_table(ch, &user_ubin_table) || 901 (is_in_table(ch, &ubin_table) || 902 (bs_mode == BS_CONTROL && is_in_table(ch, &fmt_table) && 903 not_user_defined(ch, &user_prt_table, &user_compose_table, &user_omit_table))); 904 } 905 906 /* 907 * Is this a double width UTF-8 character? 908 */ 909 public lbool is_wide_char(LWCHAR ch) 910 { 911 return is_in_table(ch, &user_wide_table) || 912 (is_in_table(ch, &wide_table) && 913 not_user_defined(ch, &user_compose_table, &user_ubin_table, &user_omit_table)); 914 } 915 916 /* 917 * Is this an omittable character? 918 */ 919 public lbool is_omit_char(LWCHAR ch) 920 { 921 return is_in_table(ch, &user_omit_table) || 922 (is_in_table(ch, &omit_table) && 923 not_user_defined(ch, &user_prt_table, &user_compose_table, &user_ubin_table)); 924 } 925 926 /* 927 * Is a character a UTF-8 combining character? 928 * A combining char acts like an ordinary char, but if it follows 929 * a specific char (not any char), the two combine into one glyph. 930 */ 931 public lbool is_combining_char(LWCHAR ch1, LWCHAR ch2) 932 { 933 /* The table is small; use linear search. */ 934 int i; 935 for (i = 0; i < countof(comb_table); i++) 936 { 937 if (ch1 == comb_table[i].first && 938 ch2 == comb_table[i].last) 939 return TRUE; 940 } 941 return FALSE; 942 } 943