strptime.c revision 1.52
1 /* $NetBSD: strptime.c,v 1.52 2015/10/30 01:49:36 ginsbach Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 2005, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code was contributed to The NetBSD Foundation by Klaus Klein. 8 * Heavily optimised by David Laight 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #if defined(LIBC_SCCS) && !defined(lint) 34 __RCSID("$NetBSD: strptime.c,v 1.52 2015/10/30 01:49:36 ginsbach Exp $"); 35 #endif 36 37 #include "namespace.h" 38 #include <sys/localedef.h> 39 #include <sys/types.h> 40 #include <ctype.h> 41 #include <locale.h> 42 #include <string.h> 43 #include <time.h> 44 #include <tzfile.h> 45 #include "private.h" 46 #include "setlocale_local.h" 47 48 #ifdef __weak_alias 49 __weak_alias(strptime,_strptime) 50 __weak_alias(strptime_l, _strptime_l) 51 #endif 52 53 static const u_char *conv_num(const unsigned char *, int *, uint, uint); 54 static const u_char *find_string(const u_char *, int *, const char * const *, 55 const char * const *, int); 56 57 #define _TIME_LOCALE(loc) \ 58 ((_TimeLocale *)((loc)->part_impl[(size_t)LC_TIME])) 59 60 /* 61 * We do not implement alternate representations. However, we always 62 * check whether a given modifier is allowed for a certain conversion. 63 */ 64 #define ALT_E 0x01 65 #define ALT_O 0x02 66 #define LEGAL_ALT(x) { if (alt_format & ~(x)) return NULL; } 67 68 #define S_YEAR (1 << 0) 69 #define S_MON (1 << 1) 70 #define S_YDAY (1 << 2) 71 #define S_MDAY (1 << 3) 72 #define S_WDAY (1 << 4) 73 #define S_HOUR (1 << 5) 74 75 #define HAVE_MDAY(s) (s & S_MDAY) 76 #define HAVE_MON(s) (s & S_MON) 77 #define HAVE_WDAY(s) (s & S_WDAY) 78 #define HAVE_YDAY(s) (s & S_YDAY) 79 #define HAVE_YEAR(s) (s & S_YEAR) 80 #define HAVE_HOUR(s) (s & S_HOUR) 81 82 static char gmt[] = { "GMT" }; 83 static char utc[] = { "UTC" }; 84 /* RFC-822/RFC-2822 */ 85 static const char * const nast[5] = { 86 "EST", "CST", "MST", "PST", "\0\0\0" 87 }; 88 static const char * const nadt[5] = { 89 "EDT", "CDT", "MDT", "PDT", "\0\0\0" 90 }; 91 92 /* 93 * Table to determine the ordinal date for the start of a month. 94 * Ref: http://en.wikipedia.org/wiki/ISO_week_date 95 */ 96 static const int start_of_month[2][13] = { 97 /* non-leap year */ 98 { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 99 /* leap year */ 100 { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } 101 }; 102 103 /* 104 * Calculate the week day of the first day of a year. Valid for 105 * the Gregorian calendar, which began Sept 14, 1752 in the UK 106 * and its colonies. Ref: 107 * http://en.wikipedia.org/wiki/Determination_of_the_day_of_the_week 108 */ 109 110 static int 111 first_wday_of(int yr) 112 { 113 return ((2 * (3 - (yr / 100) % 4)) + (yr % 100) + ((yr % 100) / 4) + 114 (isleap(yr) ? 6 : 0) + 1) % 7; 115 } 116 117 #define delim(p) ((p) == '\0' || isspace((unsigned char)(p))) 118 119 static int 120 fromzone(const unsigned char **bp, struct tm *tm) 121 { 122 timezone_t tz; 123 char buf[512], *p; 124 125 for (p = buf; !delim(**bp) && p < &buf[sizeof(buf) - 1]; (*bp)++) 126 *p++ = **bp; 127 *p = '\0'; 128 129 tz = tzalloc(buf); 130 if (tz == NULL) 131 return 0; 132 133 tm->tm_isdst = 0; /* XXX */ 134 #ifdef TM_GMTOFF 135 tm->TM_GMTOFF = tzgetgmtoff(tz, tm->tm_isdst); 136 #endif 137 #ifdef TM_ZONE 138 // Can't use tzgetname() here because we are going to free() 139 tm->TM_ZONE = NULL; /* XXX */ 140 #endif 141 tzfree(tz); 142 return 1; 143 } 144 145 char * 146 strptime(const char *buf, const char *fmt, struct tm *tm) 147 { 148 return strptime_l(buf, fmt, tm, _current_locale()); 149 } 150 151 char * 152 strptime_l(const char *buf, const char *fmt, struct tm *tm, locale_t loc) 153 { 154 unsigned char c; 155 const unsigned char *bp, *ep, *zname; 156 int alt_format, i, split_year = 0, neg = 0, state = 0, 157 day_offset = -1, week_offset = 0, offs; 158 const char *new_fmt; 159 160 bp = (const u_char *)buf; 161 162 while (bp != NULL && (c = *fmt++) != '\0') { 163 /* Clear `alternate' modifier prior to new conversion. */ 164 alt_format = 0; 165 i = 0; 166 167 /* Eat up white-space. */ 168 if (isspace(c)) { 169 while (isspace(*bp)) 170 bp++; 171 continue; 172 } 173 174 if (c != '%') 175 goto literal; 176 177 178 again: switch (c = *fmt++) { 179 case '%': /* "%%" is converted to "%". */ 180 literal: 181 if (c != *bp++) 182 return NULL; 183 LEGAL_ALT(0); 184 continue; 185 186 /* 187 * "Alternative" modifiers. Just set the appropriate flag 188 * and start over again. 189 */ 190 case 'E': /* "%E?" alternative conversion modifier. */ 191 LEGAL_ALT(0); 192 alt_format |= ALT_E; 193 goto again; 194 195 case 'O': /* "%O?" alternative conversion modifier. */ 196 LEGAL_ALT(0); 197 alt_format |= ALT_O; 198 goto again; 199 200 /* 201 * "Complex" conversion rules, implemented through recursion. 202 */ 203 case 'c': /* Date and time, using the locale's format. */ 204 new_fmt = _TIME_LOCALE(loc)->d_t_fmt; 205 state |= S_WDAY | S_MON | S_MDAY | S_YEAR; 206 goto recurse; 207 208 case 'D': /* The date as "%m/%d/%y". */ 209 new_fmt = "%m/%d/%y"; 210 LEGAL_ALT(0); 211 state |= S_MON | S_MDAY | S_YEAR; 212 goto recurse; 213 214 case 'F': /* The date as "%Y-%m-%d". */ 215 new_fmt = "%Y-%m-%d"; 216 LEGAL_ALT(0); 217 state |= S_MON | S_MDAY | S_YEAR; 218 goto recurse; 219 220 case 'R': /* The time as "%H:%M". */ 221 new_fmt = "%H:%M"; 222 LEGAL_ALT(0); 223 goto recurse; 224 225 case 'r': /* The time in 12-hour clock representation. */ 226 new_fmt = _TIME_LOCALE(loc)->t_fmt_ampm; 227 LEGAL_ALT(0); 228 goto recurse; 229 230 case 'T': /* The time as "%H:%M:%S". */ 231 new_fmt = "%H:%M:%S"; 232 LEGAL_ALT(0); 233 goto recurse; 234 235 case 'X': /* The time, using the locale's format. */ 236 new_fmt = _TIME_LOCALE(loc)->t_fmt; 237 goto recurse; 238 239 case 'x': /* The date, using the locale's format. */ 240 new_fmt = _TIME_LOCALE(loc)->d_fmt; 241 state |= S_MON | S_MDAY | S_YEAR; 242 recurse: 243 bp = (const u_char *)strptime((const char *)bp, 244 new_fmt, tm); 245 LEGAL_ALT(ALT_E); 246 continue; 247 248 /* 249 * "Elementary" conversion rules. 250 */ 251 case 'A': /* The day of week, using the locale's form. */ 252 case 'a': 253 bp = find_string(bp, &tm->tm_wday, 254 _TIME_LOCALE(loc)->day, _TIME_LOCALE(loc)->abday, 7); 255 LEGAL_ALT(0); 256 state |= S_WDAY; 257 continue; 258 259 case 'B': /* The month, using the locale's form. */ 260 case 'b': 261 case 'h': 262 bp = find_string(bp, &tm->tm_mon, 263 _TIME_LOCALE(loc)->mon, _TIME_LOCALE(loc)->abmon, 264 12); 265 LEGAL_ALT(0); 266 state |= S_MON; 267 continue; 268 269 case 'C': /* The century number. */ 270 i = 20; 271 bp = conv_num(bp, &i, 0, 99); 272 273 i = i * 100 - TM_YEAR_BASE; 274 if (split_year) 275 i += tm->tm_year % 100; 276 split_year = 1; 277 tm->tm_year = i; 278 LEGAL_ALT(ALT_E); 279 state |= S_YEAR; 280 continue; 281 282 case 'd': /* The day of month. */ 283 case 'e': 284 bp = conv_num(bp, &tm->tm_mday, 1, 31); 285 LEGAL_ALT(ALT_O); 286 state |= S_MDAY; 287 continue; 288 289 case 'k': /* The hour (24-hour clock representation). */ 290 LEGAL_ALT(0); 291 /* FALLTHROUGH */ 292 case 'H': 293 bp = conv_num(bp, &tm->tm_hour, 0, 23); 294 LEGAL_ALT(ALT_O); 295 state |= S_HOUR; 296 continue; 297 298 case 'l': /* The hour (12-hour clock representation). */ 299 LEGAL_ALT(0); 300 /* FALLTHROUGH */ 301 case 'I': 302 bp = conv_num(bp, &tm->tm_hour, 1, 12); 303 if (tm->tm_hour == 12) 304 tm->tm_hour = 0; 305 LEGAL_ALT(ALT_O); 306 state |= S_HOUR; 307 continue; 308 309 case 'j': /* The day of year. */ 310 i = 1; 311 bp = conv_num(bp, &i, 1, 366); 312 tm->tm_yday = i - 1; 313 LEGAL_ALT(0); 314 state |= S_YDAY; 315 continue; 316 317 case 'M': /* The minute. */ 318 bp = conv_num(bp, &tm->tm_min, 0, 59); 319 LEGAL_ALT(ALT_O); 320 continue; 321 322 case 'm': /* The month. */ 323 i = 1; 324 bp = conv_num(bp, &i, 1, 12); 325 tm->tm_mon = i - 1; 326 LEGAL_ALT(ALT_O); 327 state |= S_MON; 328 continue; 329 330 case 'p': /* The locale's equivalent of AM/PM. */ 331 bp = find_string(bp, &i, _TIME_LOCALE(loc)->am_pm, 332 NULL, 2); 333 if (HAVE_HOUR(state) && tm->tm_hour > 11) 334 return NULL; 335 tm->tm_hour += i * 12; 336 LEGAL_ALT(0); 337 continue; 338 339 case 'S': /* The seconds. */ 340 bp = conv_num(bp, &tm->tm_sec, 0, 61); 341 LEGAL_ALT(ALT_O); 342 continue; 343 344 #ifndef TIME_MAX 345 #define TIME_MAX INT64_MAX 346 #endif 347 case 's': /* seconds since the epoch */ 348 { 349 time_t sse = 0; 350 uint64_t rulim = TIME_MAX; 351 352 if (*bp < '0' || *bp > '9') { 353 bp = NULL; 354 continue; 355 } 356 357 do { 358 sse *= 10; 359 sse += *bp++ - '0'; 360 rulim /= 10; 361 } while ((sse * 10 <= TIME_MAX) && 362 rulim && *bp >= '0' && *bp <= '9'); 363 364 if (sse < 0 || (uint64_t)sse > TIME_MAX) { 365 bp = NULL; 366 continue; 367 } 368 369 if (localtime_r(&sse, tm) == NULL) 370 bp = NULL; 371 else 372 state |= S_YDAY | S_WDAY | 373 S_MON | S_MDAY | S_YEAR; 374 } 375 continue; 376 377 case 'U': /* The week of year, beginning on sunday. */ 378 case 'W': /* The week of year, beginning on monday. */ 379 /* 380 * XXX This is bogus, as we can not assume any valid 381 * information present in the tm structure at this 382 * point to calculate a real value, so just check the 383 * range for now. 384 */ 385 bp = conv_num(bp, &i, 0, 53); 386 LEGAL_ALT(ALT_O); 387 if (c == 'U') 388 day_offset = TM_SUNDAY; 389 else 390 day_offset = TM_MONDAY; 391 week_offset = i; 392 continue; 393 394 case 'w': /* The day of week, beginning on sunday. */ 395 bp = conv_num(bp, &tm->tm_wday, 0, 6); 396 LEGAL_ALT(ALT_O); 397 state |= S_WDAY; 398 continue; 399 400 case 'u': /* The day of week, monday = 1. */ 401 bp = conv_num(bp, &i, 1, 7); 402 tm->tm_wday = i % 7; 403 LEGAL_ALT(ALT_O); 404 state |= S_WDAY; 405 continue; 406 407 case 'g': /* The year corresponding to the ISO week 408 * number but without the century. 409 */ 410 bp = conv_num(bp, &i, 0, 99); 411 continue; 412 413 case 'G': /* The year corresponding to the ISO week 414 * number with century. 415 */ 416 do 417 bp++; 418 while (isdigit(*bp)); 419 continue; 420 421 case 'V': /* The ISO 8601:1988 week number as decimal */ 422 bp = conv_num(bp, &i, 0, 53); 423 continue; 424 425 case 'Y': /* The year. */ 426 i = TM_YEAR_BASE; /* just for data sanity... */ 427 bp = conv_num(bp, &i, 0, 9999); 428 tm->tm_year = i - TM_YEAR_BASE; 429 LEGAL_ALT(ALT_E); 430 state |= S_YEAR; 431 continue; 432 433 case 'y': /* The year within 100 years of the epoch. */ 434 /* LEGAL_ALT(ALT_E | ALT_O); */ 435 bp = conv_num(bp, &i, 0, 99); 436 437 if (split_year) 438 /* preserve century */ 439 i += (tm->tm_year / 100) * 100; 440 else { 441 split_year = 1; 442 if (i <= 68) 443 i = i + 2000 - TM_YEAR_BASE; 444 else 445 i = i + 1900 - TM_YEAR_BASE; 446 } 447 tm->tm_year = i; 448 state |= S_YEAR; 449 continue; 450 451 case 'Z': 452 tzset(); 453 if (strncmp((const char *)bp, gmt, 3) == 0 || 454 strncmp((const char *)bp, utc, 3) == 0) { 455 tm->tm_isdst = 0; 456 #ifdef TM_GMTOFF 457 tm->TM_GMTOFF = 0; 458 #endif 459 #ifdef TM_ZONE 460 tm->TM_ZONE = gmt; 461 #endif 462 bp += 3; 463 } else { 464 ep = find_string(bp, &i, 465 (const char * const *)tzname, 466 NULL, 2); 467 if (ep != NULL) { 468 tm->tm_isdst = i; 469 #ifdef TM_GMTOFF 470 #ifdef USG_COMPAT 471 tm->TM_GMTOFF = -timezone; 472 #else 473 tm->TM_GMTOFF = -timezone(); 474 #endif 475 #endif 476 #ifdef TM_ZONE 477 tm->TM_ZONE = tzname[i]; 478 bp = ep; 479 #endif 480 } else 481 (void)fromzone(&bp, tm); 482 } 483 continue; 484 485 case 'z': 486 /* 487 * We recognize all ISO 8601 formats: 488 * Z = Zulu time/UTC 489 * [+-]hhmm 490 * [+-]hh:mm 491 * [+-]hh 492 * We recognize all RFC-822/RFC-2822 formats: 493 * UT|GMT 494 * North American : UTC offsets 495 * E[DS]T = Eastern : -4 | -5 496 * C[DS]T = Central : -5 | -6 497 * M[DS]T = Mountain: -6 | -7 498 * P[DS]T = Pacific : -7 | -8 499 * Military 500 * [A-IL-M] = -1 ... -9 (J not used) 501 * [N-Y] = +1 ... +12 502 */ 503 while (isspace(*bp)) 504 bp++; 505 506 zname = bp; 507 switch (*bp++) { 508 case 'G': 509 if (*bp++ != 'M') 510 goto namedzone; 511 /*FALLTHROUGH*/ 512 case 'U': 513 if (*bp++ != 'T') 514 goto namedzone; 515 else if (!delim(*bp) && *bp++ != 'C') 516 goto namedzone; 517 /*FALLTHROUGH*/ 518 case 'Z': 519 if (!delim(*bp)) 520 goto namedzone; 521 tm->tm_isdst = 0; 522 #ifdef TM_GMTOFF 523 tm->TM_GMTOFF = 0; 524 #endif 525 #ifdef TM_ZONE 526 tm->TM_ZONE = utc; 527 #endif 528 continue; 529 case '+': 530 neg = 0; 531 break; 532 case '-': 533 neg = 1; 534 break; 535 default: 536 namedzone: 537 bp = zname; 538 539 /* Military style */ 540 if (delim(bp[1]) && 541 ((*bp >= 'A' && *bp <= 'I') || 542 (*bp >= 'L' && *bp <= 'Y'))) { 543 #ifdef TM_GMTOFF 544 /* Argh! No 'J'! */ 545 if (*bp >= 'A' && *bp <= 'I') 546 tm->TM_GMTOFF = 547 ('A' - 1) - (int)*bp; 548 else if (*bp >= 'L' && *bp <= 'M') 549 tm->TM_GMTOFF = 'A' - (int)*bp; 550 else if (*bp >= 'N' && *bp <= 'Y') 551 tm->TM_GMTOFF = (int)*bp - 'M'; 552 tm->TM_GMTOFF *= SECSPERHOUR; 553 #endif 554 #ifdef TM_ZONE 555 tm->TM_ZONE = NULL; /* XXX */ 556 #endif 557 bp++; 558 continue; 559 } 560 561 /* 562 * From our 3 letter hard-coded table 563 * XXX: Can be removed, handled by tzload() 564 */ 565 if (delim(bp[0]) || delim(bp[1]) || 566 delim(bp[2]) || !delim(bp[3])) 567 goto loadzone; 568 ep = find_string(bp, &i, nast, NULL, 4); 569 if (ep != NULL) { 570 #ifdef TM_GMTOFF 571 tm->TM_GMTOFF = (-5 - i) * SECSPERHOUR; 572 #endif 573 #ifdef TM_ZONE 574 tm->TM_ZONE = __UNCONST(nast[i]); 575 #endif 576 bp = ep; 577 continue; 578 } 579 ep = find_string(bp, &i, nadt, NULL, 4); 580 if (ep != NULL) { 581 tm->tm_isdst = 1; 582 #ifdef TM_GMTOFF 583 tm->TM_GMTOFF = (-4 - i) * SECSPERHOUR; 584 #endif 585 #ifdef TM_ZONE 586 tm->TM_ZONE = __UNCONST(nadt[i]); 587 #endif 588 bp = ep; 589 continue; 590 } 591 592 loadzone: 593 /* 594 * The hard way, load the zone! 595 */ 596 if (fromzone(&bp, tm)) 597 continue; 598 return NULL; 599 } 600 offs = 0; 601 for (i = 0; i < 4; ) { 602 if (isdigit(*bp)) { 603 offs = offs * 10 + (*bp++ - '0'); 604 i++; 605 continue; 606 } 607 if (i == 2 && *bp == ':') { 608 bp++; 609 continue; 610 } 611 break; 612 } 613 if (isdigit(*bp)) 614 return NULL; 615 switch (i) { 616 case 2: 617 offs *= SECSPERHOUR; 618 break; 619 case 4: 620 i = offs % 100; 621 if (i >= SECSPERMIN) 622 return NULL; 623 /* Convert minutes into decimal */ 624 offs = (offs / 100) * SECSPERHOUR + i * SECSPERMIN; 625 break; 626 default: 627 return NULL; 628 } 629 if (offs > (12 * SECSPERHOUR)) 630 return NULL; 631 if (neg) 632 offs = -offs; 633 tm->tm_isdst = 0; /* XXX */ 634 #ifdef TM_GMTOFF 635 tm->TM_GMTOFF = offs; 636 #endif 637 #ifdef TM_ZONE 638 tm->TM_ZONE = NULL; /* XXX */ 639 #endif 640 continue; 641 642 /* 643 * Miscellaneous conversions. 644 */ 645 case 'n': /* Any kind of white-space. */ 646 case 't': 647 while (isspace(*bp)) 648 bp++; 649 LEGAL_ALT(0); 650 continue; 651 652 653 default: /* Unknown/unsupported conversion. */ 654 return NULL; 655 } 656 } 657 658 if (!HAVE_YDAY(state) && HAVE_YEAR(state)) { 659 if (HAVE_MON(state) && HAVE_MDAY(state)) { 660 /* calculate day of year (ordinal date) */ 661 tm->tm_yday = start_of_month[isleap_sum(tm->tm_year, 662 TM_YEAR_BASE)][tm->tm_mon] + (tm->tm_mday - 1); 663 state |= S_YDAY; 664 } else if (day_offset != -1) { 665 /* 666 * Set the date to the first Sunday (or Monday) 667 * of the specified week of the year. 668 */ 669 if (!HAVE_WDAY(state)) { 670 tm->tm_wday = day_offset; 671 state |= S_WDAY; 672 } 673 tm->tm_yday = (7 - 674 first_wday_of(tm->tm_year + TM_YEAR_BASE) + 675 day_offset) % 7 + (week_offset - 1) * 7 + 676 tm->tm_wday - day_offset; 677 state |= S_YDAY; 678 } 679 } 680 681 if (HAVE_YDAY(state) && HAVE_YEAR(state)) { 682 int isleap; 683 684 if (!HAVE_MON(state)) { 685 /* calculate month of day of year */ 686 i = 0; 687 isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE); 688 while (tm->tm_yday >= start_of_month[isleap][i]) 689 i++; 690 if (i > 12) { 691 i = 1; 692 tm->tm_yday -= start_of_month[isleap][12]; 693 tm->tm_year++; 694 } 695 tm->tm_mon = i - 1; 696 state |= S_MON; 697 } 698 699 if (!HAVE_MDAY(state)) { 700 /* calculate day of month */ 701 isleap = isleap_sum(tm->tm_year, TM_YEAR_BASE); 702 tm->tm_mday = tm->tm_yday - 703 start_of_month[isleap][tm->tm_mon] + 1; 704 state |= S_MDAY; 705 } 706 707 if (!HAVE_WDAY(state)) { 708 /* calculate day of week */ 709 i = 0; 710 week_offset = first_wday_of(tm->tm_year); 711 while (i++ <= tm->tm_yday) { 712 if (week_offset++ >= 6) 713 week_offset = 0; 714 } 715 tm->tm_wday = week_offset; 716 state |= S_WDAY; 717 } 718 } 719 720 return __UNCONST(bp); 721 } 722 723 724 static const u_char * 725 conv_num(const unsigned char *buf, int *dest, uint llim, uint ulim) 726 { 727 uint result = 0; 728 unsigned char ch; 729 730 /* The limit also determines the number of valid digits. */ 731 uint rulim = ulim; 732 733 ch = *buf; 734 if (ch < '0' || ch > '9') 735 return NULL; 736 737 do { 738 result *= 10; 739 result += ch - '0'; 740 rulim /= 10; 741 ch = *++buf; 742 } while ((result * 10 <= ulim) && rulim && ch >= '0' && ch <= '9'); 743 744 if (result < llim || result > ulim) 745 return NULL; 746 747 *dest = result; 748 return buf; 749 } 750 751 static const u_char * 752 find_string(const u_char *bp, int *tgt, const char * const *n1, 753 const char * const *n2, int c) 754 { 755 int i; 756 size_t len; 757 758 /* check full name - then abbreviated ones */ 759 for (; n1 != NULL; n1 = n2, n2 = NULL) { 760 for (i = 0; i < c; i++, n1++) { 761 len = strlen(*n1); 762 if (strncasecmp(*n1, (const char *)bp, len) == 0) { 763 *tgt = i; 764 return bp + len; 765 } 766 } 767 } 768 769 /* Nothing matched */ 770 return NULL; 771 } 772
Indexes created Thu Sep 25 16:09:42 GMT 2025