prtime.cc revision 58d02015f8788a79b322c58d4bdbc914e4c333dc
1/* Portions are Copyright (C) 2007 Google Inc */ 2/* ***** BEGIN LICENSE BLOCK ***** 3 * Version: MPL 1.1/GPL 2.0/LGPL 2.1 4 * 5 * The contents of this file are subject to the Mozilla Public License Version 6 * 1.1 (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * http://www.mozilla.org/MPL/ 9 * 10 * Software distributed under the License is distributed on an "AS IS" basis, 11 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 12 * for the specific language governing rights and limitations under the 13 * License. 14 * 15 * The Original Code is the Netscape Portable Runtime (NSPR). 16 * 17 * The Initial Developer of the Original Code is 18 * Netscape Communications Corporation. 19 * Portions created by the Initial Developer are Copyright (C) 1998-2000 20 * the Initial Developer. All Rights Reserved. 21 * 22 * Contributor(s): 23 * 24 * Alternatively, the contents of this file may be used under the terms of 25 * either the GNU General Public License Version 2 or later (the "GPL"), or 26 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), 27 * in which case the provisions of the GPL or the LGPL are applicable instead 28 * of those above. If you wish to allow use of your version of this file only 29 * under the terms of either the GPL or the LGPL, and not to allow others to 30 * use your version of this file under the terms of the MPL, indicate your 31 * decision by deleting the provisions above and replace them with the notice 32 * and other provisions required by the GPL or the LGPL. If you do not delete 33 * the provisions above, a recipient may use your version of this file under 34 * the terms of any one of the MPL, the GPL or the LGPL. 35 * 36 * ***** END LICENSE BLOCK ***** */ 37 38/* 39 * prtime.cc -- 40 * NOTE: The original nspr file name is prtime.c 41 * 42 * NSPR date and time functions 43 * 44 * CVS revision 3.37 45 */ 46 47/* 48 * The following functions were copied from the NSPR prtime.c file. 49 * PR_ParseTimeString 50 * We inlined the new PR_ParseTimeStringToExplodedTime function to avoid 51 * copying PR_ExplodeTime and PR_LocalTimeParameters. (The PR_ExplodeTime 52 * and PR_ImplodeTime calls cancel each other out.) 53 * PR_NormalizeTime 54 * PR_GMTParameters 55 * PR_ImplodeTime 56 * This was modified to use the Win32 SYSTEMTIME/FILETIME structures 57 * and the timezone offsets are applied to the FILETIME structure. 58 * All types and macros are defined in the base/third_party/prtime.h file. 59 * These have been copied from the following nspr files. We have only copied 60 * over the types we need. 61 * 1. prtime.h 62 * 2. prtypes.h 63 * 3. prlong.h 64 */ 65 66#include "prtime.h" 67#include "build/build_config.h" 68 69#if defined(OS_WIN) 70#include <windows.h> 71#elif defined(OS_MACOSX) 72#include <CoreFoundation/CoreFoundation.h> 73#endif 74#include <errno.h> /* for EINVAL */ 75#include <time.h> 76 77/* Implements the Unix localtime_r() function for windows */ 78#if defined(OS_WIN) 79static void localtime_r(const time_t* secs, struct tm* time) { 80 (void) localtime_s(time, secs); 81} 82#endif 83 84/* 85 *------------------------------------------------------------------------ 86 * 87 * PR_ImplodeTime -- 88 * 89 * Cf. time_t mktime(struct tm *tp) 90 * Note that 1 year has < 2^25 seconds. So an PRInt32 is large enough. 91 * 92 *------------------------------------------------------------------------ 93 */ 94PRTime 95PR_ImplodeTime(const PRExplodedTime *exploded) 96{ 97 // This is important, we want to make sure multiplications are 98 // done with the correct precision. 99 static const PRTime kSecondsToMicroseconds = static_cast<PRTime>(1000000); 100#if defined(OS_WIN) 101 // Create the system struct representing our exploded time. 102 SYSTEMTIME st = {0}; 103 FILETIME ft = {0}; 104 ULARGE_INTEGER uli = {0}; 105 106 st.wYear = exploded->tm_year; 107 st.wMonth = exploded->tm_month + 1; 108 st.wDayOfWeek = exploded->tm_wday; 109 st.wDay = exploded->tm_mday; 110 st.wHour = exploded->tm_hour; 111 st.wMinute = exploded->tm_min; 112 st.wSecond = exploded->tm_sec; 113 st.wMilliseconds = exploded->tm_usec/1000; 114 // Convert to FILETIME. 115 if (!SystemTimeToFileTime(&st, &ft)) { 116 NOTREACHED() << "Unable to convert time"; 117 return 0; 118 } 119 // Apply offsets. 120 uli.LowPart = ft.dwLowDateTime; 121 uli.HighPart = ft.dwHighDateTime; 122 // Convert from Windows epoch to NSPR epoch, and 100-nanoseconds units 123 // to microsecond units. 124 PRTime result = 125 static_cast<PRTime>((uli.QuadPart / 10) - 11644473600000000i64); 126 // Adjust for time zone and dst. Convert from seconds to microseconds. 127 result -= (exploded->tm_params.tp_gmt_offset + 128 exploded->tm_params.tp_dst_offset) * kSecondsToMicroseconds; 129 return result; 130#elif defined(OS_MACOSX) 131 // Create the system struct representing our exploded time. 132 CFGregorianDate gregorian_date; 133 gregorian_date.year = exploded->tm_year; 134 gregorian_date.month = exploded->tm_month + 1; 135 gregorian_date.day = exploded->tm_mday; 136 gregorian_date.hour = exploded->tm_hour; 137 gregorian_date.minute = exploded->tm_min; 138 gregorian_date.second = exploded->tm_sec; 139 140 // Compute |absolute_time| in seconds, correct for gmt and dst 141 // (note the combined offset will be negative when we need to add it), then 142 // convert to microseconds which is what PRTime expects. 143 CFAbsoluteTime absolute_time = 144 CFGregorianDateGetAbsoluteTime(gregorian_date, NULL); 145 PRTime result = static_cast<PRTime>(absolute_time); 146 result -= exploded->tm_params.tp_gmt_offset + 147 exploded->tm_params.tp_dst_offset; 148 result += kCFAbsoluteTimeIntervalSince1970; // PRTime epoch is 1970 149 result *= kSecondsToMicroseconds; 150 result += exploded->tm_usec; 151 return result; 152#elif defined(OS_POSIX) 153 struct tm exp_tm = {0}; 154 exp_tm.tm_sec = exploded->tm_sec; 155 exp_tm.tm_min = exploded->tm_min; 156 exp_tm.tm_hour = exploded->tm_hour; 157 exp_tm.tm_mday = exploded->tm_mday; 158 exp_tm.tm_mon = exploded->tm_month; 159 exp_tm.tm_year = exploded->tm_year - 1900; 160 161#if defined(ANDROID) 162 // TODO: Fix in bionic 163 time_t absolute_time = mktime(&exp_tm); 164#else 165 time_t absolute_time = timegm(&exp_tm); 166#endif // broken android 167 168 // If timegm returned -1. Since we don't pass it a time zone, the only 169 // valid case of returning -1 is 1 second before Epoch (Dec 31, 1969). 170 if (absolute_time == -1 && 171 !(exploded->tm_year == 1969 && exploded->tm_month == 11 && 172 exploded->tm_mday == 31 && exploded->tm_hour == 23 && 173 exploded->tm_min == 59 && exploded->tm_sec == 59)) { 174 // If we get here, time_t must be 32 bits. 175 // Date was possibly too far in the future and would overflow. Return 176 // the most future date possible (year 2038). 177 if (exploded->tm_year >= 1970) 178 return INT_MAX * kSecondsToMicroseconds; 179 // Date was possibly too far in the past and would underflow. Return 180 // the most past date possible (year 1901). 181 return INT_MIN * kSecondsToMicroseconds; 182 } 183 184 PRTime result = static_cast<PRTime>(absolute_time); 185 result -= exploded->tm_params.tp_gmt_offset + 186 exploded->tm_params.tp_dst_offset; 187 result *= kSecondsToMicroseconds; 188 result += exploded->tm_usec; 189 return result; 190#else 191#error No PR_ImplodeTime implemented on your platform. 192#endif 193} 194 195/* 196 * The COUNT_LEAPS macro counts the number of leap years passed by 197 * till the start of the given year Y. At the start of the year 4 198 * A.D. the number of leap years passed by is 0, while at the start of 199 * the year 5 A.D. this count is 1. The number of years divisible by 200 * 100 but not divisible by 400 (the non-leap years) is deducted from 201 * the count to get the correct number of leap years. 202 * 203 * The COUNT_DAYS macro counts the number of days since 01/01/01 till the 204 * start of the given year Y. The number of days at the start of the year 205 * 1 is 0 while the number of days at the start of the year 2 is 365 206 * (which is ((2)-1) * 365) and so on. The reference point is 01/01/01 207 * midnight 00:00:00. 208 */ 209 210#define COUNT_LEAPS(Y) ( ((Y)-1)/4 - ((Y)-1)/100 + ((Y)-1)/400 ) 211#define COUNT_DAYS(Y) ( ((Y)-1)*365 + COUNT_LEAPS(Y) ) 212#define DAYS_BETWEEN_YEARS(A, B) (COUNT_DAYS(B) - COUNT_DAYS(A)) 213 214/* 215 * Static variables used by functions in this file 216 */ 217 218/* 219 * The following array contains the day of year for the last day of 220 * each month, where index 1 is January, and day 0 is January 1. 221 */ 222 223static const int lastDayOfMonth[2][13] = { 224 {-1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364}, 225 {-1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365} 226}; 227 228/* 229 * The number of days in a month 230 */ 231 232static const PRInt8 nDays[2][12] = { 233 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, 234 {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31} 235}; 236 237/* 238 *------------------------------------------------------------------------- 239 * 240 * IsLeapYear -- 241 * 242 * Returns 1 if the year is a leap year, 0 otherwise. 243 * 244 *------------------------------------------------------------------------- 245 */ 246 247static int IsLeapYear(PRInt16 year) 248{ 249 if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) 250 return 1; 251 else 252 return 0; 253} 254 255/* 256 * 'secOffset' should be less than 86400 (i.e., a day). 257 * 'time' should point to a normalized PRExplodedTime. 258 */ 259 260static void 261ApplySecOffset(PRExplodedTime *time, PRInt32 secOffset) 262{ 263 time->tm_sec += secOffset; 264 265 /* Note that in this implementation we do not count leap seconds */ 266 if (time->tm_sec < 0 || time->tm_sec >= 60) { 267 time->tm_min += time->tm_sec / 60; 268 time->tm_sec %= 60; 269 if (time->tm_sec < 0) { 270 time->tm_sec += 60; 271 time->tm_min--; 272 } 273 } 274 275 if (time->tm_min < 0 || time->tm_min >= 60) { 276 time->tm_hour += time->tm_min / 60; 277 time->tm_min %= 60; 278 if (time->tm_min < 0) { 279 time->tm_min += 60; 280 time->tm_hour--; 281 } 282 } 283 284 if (time->tm_hour < 0) { 285 /* Decrement mday, yday, and wday */ 286 time->tm_hour += 24; 287 time->tm_mday--; 288 time->tm_yday--; 289 if (time->tm_mday < 1) { 290 time->tm_month--; 291 if (time->tm_month < 0) { 292 time->tm_month = 11; 293 time->tm_year--; 294 if (IsLeapYear(time->tm_year)) 295 time->tm_yday = 365; 296 else 297 time->tm_yday = 364; 298 } 299 time->tm_mday = nDays[IsLeapYear(time->tm_year)][time->tm_month]; 300 } 301 time->tm_wday--; 302 if (time->tm_wday < 0) 303 time->tm_wday = 6; 304 } else if (time->tm_hour > 23) { 305 /* Increment mday, yday, and wday */ 306 time->tm_hour -= 24; 307 time->tm_mday++; 308 time->tm_yday++; 309 if (time->tm_mday > 310 nDays[IsLeapYear(time->tm_year)][time->tm_month]) { 311 time->tm_mday = 1; 312 time->tm_month++; 313 if (time->tm_month > 11) { 314 time->tm_month = 0; 315 time->tm_year++; 316 time->tm_yday = 0; 317 } 318 } 319 time->tm_wday++; 320 if (time->tm_wday > 6) 321 time->tm_wday = 0; 322 } 323} 324 325void 326PR_NormalizeTime(PRExplodedTime *time, PRTimeParamFn params) 327{ 328 int daysInMonth; 329 PRInt32 numDays; 330 331 /* Get back to GMT */ 332 time->tm_sec -= time->tm_params.tp_gmt_offset 333 + time->tm_params.tp_dst_offset; 334 time->tm_params.tp_gmt_offset = 0; 335 time->tm_params.tp_dst_offset = 0; 336 337 /* Now normalize GMT */ 338 339 if (time->tm_usec < 0 || time->tm_usec >= 1000000) { 340 time->tm_sec += time->tm_usec / 1000000; 341 time->tm_usec %= 1000000; 342 if (time->tm_usec < 0) { 343 time->tm_usec += 1000000; 344 time->tm_sec--; 345 } 346 } 347 348 /* Note that we do not count leap seconds in this implementation */ 349 if (time->tm_sec < 0 || time->tm_sec >= 60) { 350 time->tm_min += time->tm_sec / 60; 351 time->tm_sec %= 60; 352 if (time->tm_sec < 0) { 353 time->tm_sec += 60; 354 time->tm_min--; 355 } 356 } 357 358 if (time->tm_min < 0 || time->tm_min >= 60) { 359 time->tm_hour += time->tm_min / 60; 360 time->tm_min %= 60; 361 if (time->tm_min < 0) { 362 time->tm_min += 60; 363 time->tm_hour--; 364 } 365 } 366 367 if (time->tm_hour < 0 || time->tm_hour >= 24) { 368 time->tm_mday += time->tm_hour / 24; 369 time->tm_hour %= 24; 370 if (time->tm_hour < 0) { 371 time->tm_hour += 24; 372 time->tm_mday--; 373 } 374 } 375 376 /* Normalize month and year before mday */ 377 if (time->tm_month < 0 || time->tm_month >= 12) { 378 time->tm_year += time->tm_month / 12; 379 time->tm_month %= 12; 380 if (time->tm_month < 0) { 381 time->tm_month += 12; 382 time->tm_year--; 383 } 384 } 385 386 /* Now that month and year are in proper range, normalize mday */ 387 388 if (time->tm_mday < 1) { 389 /* mday too small */ 390 do { 391 /* the previous month */ 392 time->tm_month--; 393 if (time->tm_month < 0) { 394 time->tm_month = 11; 395 time->tm_year--; 396 } 397 time->tm_mday += nDays[IsLeapYear(time->tm_year)][time->tm_month]; 398 } while (time->tm_mday < 1); 399 } else { 400 daysInMonth = nDays[IsLeapYear(time->tm_year)][time->tm_month]; 401 while (time->tm_mday > daysInMonth) { 402 /* mday too large */ 403 time->tm_mday -= daysInMonth; 404 time->tm_month++; 405 if (time->tm_month > 11) { 406 time->tm_month = 0; 407 time->tm_year++; 408 } 409 daysInMonth = nDays[IsLeapYear(time->tm_year)][time->tm_month]; 410 } 411 } 412 413 /* Recompute yday and wday */ 414 time->tm_yday = time->tm_mday + 415 lastDayOfMonth[IsLeapYear(time->tm_year)][time->tm_month]; 416 417 numDays = DAYS_BETWEEN_YEARS(1970, time->tm_year) + time->tm_yday; 418 time->tm_wday = (numDays + 4) % 7; 419 if (time->tm_wday < 0) { 420 time->tm_wday += 7; 421 } 422 423 /* Recompute time parameters */ 424 425 time->tm_params = params(time); 426 427 ApplySecOffset(time, time->tm_params.tp_gmt_offset 428 + time->tm_params.tp_dst_offset); 429} 430 431/* 432 *------------------------------------------------------------------------ 433 * 434 * PR_GMTParameters -- 435 * 436 * Returns the PRTimeParameters for Greenwich Mean Time. 437 * Trivially, both the tp_gmt_offset and tp_dst_offset fields are 0. 438 * 439 *------------------------------------------------------------------------ 440 */ 441 442PRTimeParameters 443PR_GMTParameters(const PRExplodedTime *gmt) 444{ 445#if defined(XP_MAC) 446#pragma unused (gmt) 447#endif 448 449 PRTimeParameters retVal = { 0, 0 }; 450 return retVal; 451} 452 453/* 454 * The following code implements PR_ParseTimeString(). It is based on 455 * ns/lib/xp/xp_time.c, revision 1.25, by Jamie Zawinski <jwz@netscape.com>. 456 */ 457 458/* 459 * We only recognize the abbreviations of a small subset of time zones 460 * in North America, Europe, and Japan. 461 * 462 * PST/PDT: Pacific Standard/Daylight Time 463 * MST/MDT: Mountain Standard/Daylight Time 464 * CST/CDT: Central Standard/Daylight Time 465 * EST/EDT: Eastern Standard/Daylight Time 466 * AST: Atlantic Standard Time 467 * NST: Newfoundland Standard Time 468 * GMT: Greenwich Mean Time 469 * BST: British Summer Time 470 * MET: Middle Europe Time 471 * EET: Eastern Europe Time 472 * JST: Japan Standard Time 473 */ 474 475typedef enum 476{ 477 TT_UNKNOWN, 478 479 TT_SUN, TT_MON, TT_TUE, TT_WED, TT_THU, TT_FRI, TT_SAT, 480 481 TT_JAN, TT_FEB, TT_MAR, TT_APR, TT_MAY, TT_JUN, 482 TT_JUL, TT_AUG, TT_SEP, TT_OCT, TT_NOV, TT_DEC, 483 484 TT_PST, TT_PDT, TT_MST, TT_MDT, TT_CST, TT_CDT, TT_EST, TT_EDT, 485 TT_AST, TT_NST, TT_GMT, TT_BST, TT_MET, TT_EET, TT_JST 486} TIME_TOKEN; 487 488/* 489 * This parses a time/date string into a PRTime 490 * (microseconds after "1-Jan-1970 00:00:00 GMT"). 491 * It returns PR_SUCCESS on success, and PR_FAILURE 492 * if the time/date string can't be parsed. 493 * 494 * Many formats are handled, including: 495 * 496 * 14 Apr 89 03:20:12 497 * 14 Apr 89 03:20 GMT 498 * Fri, 17 Mar 89 4:01:33 499 * Fri, 17 Mar 89 4:01 GMT 500 * Mon Jan 16 16:12 PDT 1989 501 * Mon Jan 16 16:12 +0130 1989 502 * 6 May 1992 16:41-JST (Wednesday) 503 * 22-AUG-1993 10:59:12.82 504 * 22-AUG-1993 10:59pm 505 * 22-AUG-1993 12:59am 506 * 22-AUG-1993 12:59 PM 507 * Friday, August 04, 1995 3:54 PM 508 * 06/21/95 04:24:34 PM 509 * 20/06/95 21:07 510 * 95-06-08 19:32:48 EDT 511 * 512 * If the input string doesn't contain a description of the timezone, 513 * we consult the `default_to_gmt' to decide whether the string should 514 * be interpreted relative to the local time zone (PR_FALSE) or GMT (PR_TRUE). 515 * The correct value for this argument depends on what standard specified 516 * the time string which you are parsing. 517 */ 518 519PRStatus 520PR_ParseTimeString( 521 const char *string, 522 PRBool default_to_gmt, 523 PRTime *result_imploded) 524{ 525 PRExplodedTime tm; 526 PRExplodedTime *result = &tm; 527 TIME_TOKEN dotw = TT_UNKNOWN; 528 TIME_TOKEN month = TT_UNKNOWN; 529 TIME_TOKEN zone = TT_UNKNOWN; 530 int zone_offset = -1; 531 int dst_offset = 0; 532 int date = -1; 533 PRInt32 year = -1; 534 int hour = -1; 535 int min = -1; 536 int sec = -1; 537 538 const char *rest = string; 539 540 int iterations = 0; 541 542 PR_ASSERT(string && result); 543 if (!string || !result) return PR_FAILURE; 544 545 while (*rest) 546 { 547 548 if (iterations++ > 1000) 549 { 550 return PR_FAILURE; 551 } 552 553 switch (*rest) 554 { 555 case 'a': case 'A': 556 if (month == TT_UNKNOWN && 557 (rest[1] == 'p' || rest[1] == 'P') && 558 (rest[2] == 'r' || rest[2] == 'R')) 559 month = TT_APR; 560 else if (zone == TT_UNKNOWN && 561 (rest[1] == 's' || rest[1] == 'S') && 562 (rest[2] == 't' || rest[2] == 'T')) 563 zone = TT_AST; 564 else if (month == TT_UNKNOWN && 565 (rest[1] == 'u' || rest[1] == 'U') && 566 (rest[2] == 'g' || rest[2] == 'G')) 567 month = TT_AUG; 568 break; 569 case 'b': case 'B': 570 if (zone == TT_UNKNOWN && 571 (rest[1] == 's' || rest[1] == 'S') && 572 (rest[2] == 't' || rest[2] == 'T')) 573 zone = TT_BST; 574 break; 575 case 'c': case 'C': 576 if (zone == TT_UNKNOWN && 577 (rest[1] == 'd' || rest[1] == 'D') && 578 (rest[2] == 't' || rest[2] == 'T')) 579 zone = TT_CDT; 580 else if (zone == TT_UNKNOWN && 581 (rest[1] == 's' || rest[1] == 'S') && 582 (rest[2] == 't' || rest[2] == 'T')) 583 zone = TT_CST; 584 break; 585 case 'd': case 'D': 586 if (month == TT_UNKNOWN && 587 (rest[1] == 'e' || rest[1] == 'E') && 588 (rest[2] == 'c' || rest[2] == 'C')) 589 month = TT_DEC; 590 break; 591 case 'e': case 'E': 592 if (zone == TT_UNKNOWN && 593 (rest[1] == 'd' || rest[1] == 'D') && 594 (rest[2] == 't' || rest[2] == 'T')) 595 zone = TT_EDT; 596 else if (zone == TT_UNKNOWN && 597 (rest[1] == 'e' || rest[1] == 'E') && 598 (rest[2] == 't' || rest[2] == 'T')) 599 zone = TT_EET; 600 else if (zone == TT_UNKNOWN && 601 (rest[1] == 's' || rest[1] == 'S') && 602 (rest[2] == 't' || rest[2] == 'T')) 603 zone = TT_EST; 604 break; 605 case 'f': case 'F': 606 if (month == TT_UNKNOWN && 607 (rest[1] == 'e' || rest[1] == 'E') && 608 (rest[2] == 'b' || rest[2] == 'B')) 609 month = TT_FEB; 610 else if (dotw == TT_UNKNOWN && 611 (rest[1] == 'r' || rest[1] == 'R') && 612 (rest[2] == 'i' || rest[2] == 'I')) 613 dotw = TT_FRI; 614 break; 615 case 'g': case 'G': 616 if (zone == TT_UNKNOWN && 617 (rest[1] == 'm' || rest[1] == 'M') && 618 (rest[2] == 't' || rest[2] == 'T')) 619 zone = TT_GMT; 620 break; 621 case 'j': case 'J': 622 if (month == TT_UNKNOWN && 623 (rest[1] == 'a' || rest[1] == 'A') && 624 (rest[2] == 'n' || rest[2] == 'N')) 625 month = TT_JAN; 626 else if (zone == TT_UNKNOWN && 627 (rest[1] == 's' || rest[1] == 'S') && 628 (rest[2] == 't' || rest[2] == 'T')) 629 zone = TT_JST; 630 else if (month == TT_UNKNOWN && 631 (rest[1] == 'u' || rest[1] == 'U') && 632 (rest[2] == 'l' || rest[2] == 'L')) 633 month = TT_JUL; 634 else if (month == TT_UNKNOWN && 635 (rest[1] == 'u' || rest[1] == 'U') && 636 (rest[2] == 'n' || rest[2] == 'N')) 637 month = TT_JUN; 638 break; 639 case 'm': case 'M': 640 if (month == TT_UNKNOWN && 641 (rest[1] == 'a' || rest[1] == 'A') && 642 (rest[2] == 'r' || rest[2] == 'R')) 643 month = TT_MAR; 644 else if (month == TT_UNKNOWN && 645 (rest[1] == 'a' || rest[1] == 'A') && 646 (rest[2] == 'y' || rest[2] == 'Y')) 647 month = TT_MAY; 648 else if (zone == TT_UNKNOWN && 649 (rest[1] == 'd' || rest[1] == 'D') && 650 (rest[2] == 't' || rest[2] == 'T')) 651 zone = TT_MDT; 652 else if (zone == TT_UNKNOWN && 653 (rest[1] == 'e' || rest[1] == 'E') && 654 (rest[2] == 't' || rest[2] == 'T')) 655 zone = TT_MET; 656 else if (dotw == TT_UNKNOWN && 657 (rest[1] == 'o' || rest[1] == 'O') && 658 (rest[2] == 'n' || rest[2] == 'N')) 659 dotw = TT_MON; 660 else if (zone == TT_UNKNOWN && 661 (rest[1] == 's' || rest[1] == 'S') && 662 (rest[2] == 't' || rest[2] == 'T')) 663 zone = TT_MST; 664 break; 665 case 'n': case 'N': 666 if (month == TT_UNKNOWN && 667 (rest[1] == 'o' || rest[1] == 'O') && 668 (rest[2] == 'v' || rest[2] == 'V')) 669 month = TT_NOV; 670 else if (zone == TT_UNKNOWN && 671 (rest[1] == 's' || rest[1] == 'S') && 672 (rest[2] == 't' || rest[2] == 'T')) 673 zone = TT_NST; 674 break; 675 case 'o': case 'O': 676 if (month == TT_UNKNOWN && 677 (rest[1] == 'c' || rest[1] == 'C') && 678 (rest[2] == 't' || rest[2] == 'T')) 679 month = TT_OCT; 680 break; 681 case 'p': case 'P': 682 if (zone == TT_UNKNOWN && 683 (rest[1] == 'd' || rest[1] == 'D') && 684 (rest[2] == 't' || rest[2] == 'T')) 685 zone = TT_PDT; 686 else if (zone == TT_UNKNOWN && 687 (rest[1] == 's' || rest[1] == 'S') && 688 (rest[2] == 't' || rest[2] == 'T')) 689 zone = TT_PST; 690 break; 691 case 's': case 'S': 692 if (dotw == TT_UNKNOWN && 693 (rest[1] == 'a' || rest[1] == 'A') && 694 (rest[2] == 't' || rest[2] == 'T')) 695 dotw = TT_SAT; 696 else if (month == TT_UNKNOWN && 697 (rest[1] == 'e' || rest[1] == 'E') && 698 (rest[2] == 'p' || rest[2] == 'P')) 699 month = TT_SEP; 700 else if (dotw == TT_UNKNOWN && 701 (rest[1] == 'u' || rest[1] == 'U') && 702 (rest[2] == 'n' || rest[2] == 'N')) 703 dotw = TT_SUN; 704 break; 705 case 't': case 'T': 706 if (dotw == TT_UNKNOWN && 707 (rest[1] == 'h' || rest[1] == 'H') && 708 (rest[2] == 'u' || rest[2] == 'U')) 709 dotw = TT_THU; 710 else if (dotw == TT_UNKNOWN && 711 (rest[1] == 'u' || rest[1] == 'U') && 712 (rest[2] == 'e' || rest[2] == 'E')) 713 dotw = TT_TUE; 714 break; 715 case 'u': case 'U': 716 if (zone == TT_UNKNOWN && 717 (rest[1] == 't' || rest[1] == 'T') && 718 !(rest[2] >= 'A' && rest[2] <= 'Z') && 719 !(rest[2] >= 'a' && rest[2] <= 'z')) 720 /* UT is the same as GMT but UTx is not. */ 721 zone = TT_GMT; 722 break; 723 case 'w': case 'W': 724 if (dotw == TT_UNKNOWN && 725 (rest[1] == 'e' || rest[1] == 'E') && 726 (rest[2] == 'd' || rest[2] == 'D')) 727 dotw = TT_WED; 728 break; 729 730 case '+': case '-': 731 { 732 const char *end; 733 int sign; 734 if (zone_offset != -1) 735 { 736 /* already got one... */ 737 rest++; 738 break; 739 } 740 if (zone != TT_UNKNOWN && zone != TT_GMT) 741 { 742 /* GMT+0300 is legal, but PST+0300 is not. */ 743 rest++; 744 break; 745 } 746 747 sign = ((*rest == '+') ? 1 : -1); 748 rest++; /* move over sign */ 749 end = rest; 750 while (*end >= '0' && *end <= '9') 751 end++; 752 if (rest == end) /* no digits here */ 753 break; 754 755 if ((end - rest) == 4) 756 /* offset in HHMM */ 757 zone_offset = (((((rest[0]-'0')*10) + (rest[1]-'0')) * 60) + 758 (((rest[2]-'0')*10) + (rest[3]-'0'))); 759 else if ((end - rest) == 2) 760 /* offset in hours */ 761 zone_offset = (((rest[0]-'0')*10) + (rest[1]-'0')) * 60; 762 else if ((end - rest) == 1) 763 /* offset in hours */ 764 zone_offset = (rest[0]-'0') * 60; 765 else 766 /* 3 or >4 */ 767 break; 768 769 zone_offset *= sign; 770 zone = TT_GMT; 771 break; 772 } 773 774 case '0': case '1': case '2': case '3': case '4': 775 case '5': case '6': case '7': case '8': case '9': 776 { 777 int tmp_hour = -1; 778 int tmp_min = -1; 779 int tmp_sec = -1; 780 const char *end = rest + 1; 781 while (*end >= '0' && *end <= '9') 782 end++; 783 784 /* end is now the first character after a range of digits. */ 785 786 if (*end == ':') 787 { 788 if (hour >= 0 && min >= 0) /* already got it */ 789 break; 790 791 /* We have seen "[0-9]+:", so this is probably HH:MM[:SS] */ 792 if ((end - rest) > 2) 793 /* it is [0-9][0-9][0-9]+: */ 794 break; 795 else if ((end - rest) == 2) 796 tmp_hour = ((rest[0]-'0')*10 + 797 (rest[1]-'0')); 798 else 799 tmp_hour = (rest[0]-'0'); 800 801 /* move over the colon, and parse minutes */ 802 803 rest = ++end; 804 while (*end >= '0' && *end <= '9') 805 end++; 806 807 if (end == rest) 808 /* no digits after first colon? */ 809 break; 810 else if ((end - rest) > 2) 811 /* it is [0-9][0-9][0-9]+: */ 812 break; 813 else if ((end - rest) == 2) 814 tmp_min = ((rest[0]-'0')*10 + 815 (rest[1]-'0')); 816 else 817 tmp_min = (rest[0]-'0'); 818 819 /* now go for seconds */ 820 rest = end; 821 if (*rest == ':') 822 rest++; 823 end = rest; 824 while (*end >= '0' && *end <= '9') 825 end++; 826 827 if (end == rest) 828 /* no digits after second colon - that's ok. */ 829 ; 830 else if ((end - rest) > 2) 831 /* it is [0-9][0-9][0-9]+: */ 832 break; 833 else if ((end - rest) == 2) 834 tmp_sec = ((rest[0]-'0')*10 + 835 (rest[1]-'0')); 836 else 837 tmp_sec = (rest[0]-'0'); 838 839 /* If we made it here, we've parsed hour and min, 840 and possibly sec, so it worked as a unit. */ 841 842 /* skip over whitespace and see if there's an AM or PM 843 directly following the time. 844 */ 845 if (tmp_hour <= 12) 846 { 847 const char *s = end; 848 while (*s && (*s == ' ' || *s == '\t')) 849 s++; 850 if ((s[0] == 'p' || s[0] == 'P') && 851 (s[1] == 'm' || s[1] == 'M')) 852 /* 10:05pm == 22:05, and 12:05pm == 12:05 */ 853 tmp_hour = (tmp_hour == 12 ? 12 : tmp_hour + 12); 854 else if (tmp_hour == 12 && 855 (s[0] == 'a' || s[0] == 'A') && 856 (s[1] == 'm' || s[1] == 'M')) 857 /* 12:05am == 00:05 */ 858 tmp_hour = 0; 859 } 860 861 hour = tmp_hour; 862 min = tmp_min; 863 sec = tmp_sec; 864 rest = end; 865 break; 866 } 867 else if ((*end == '/' || *end == '-') && 868 end[1] >= '0' && end[1] <= '9') 869 { 870 /* Perhaps this is 6/16/95, 16/6/95, 6-16-95, or 16-6-95 871 or even 95-06-05... 872 #### But it doesn't handle 1995-06-22. 873 */ 874 int n1, n2, n3; 875 const char *s; 876 877 if (month != TT_UNKNOWN) 878 /* if we saw a month name, this can't be. */ 879 break; 880 881 s = rest; 882 883 n1 = (*s++ - '0'); /* first 1 or 2 digits */ 884 if (*s >= '0' && *s <= '9') 885 n1 = n1*10 + (*s++ - '0'); 886 887 if (*s != '/' && *s != '-') /* slash */ 888 break; 889 s++; 890 891 if (*s < '0' || *s > '9') /* second 1 or 2 digits */ 892 break; 893 n2 = (*s++ - '0'); 894 if (*s >= '0' && *s <= '9') 895 n2 = n2*10 + (*s++ - '0'); 896 897 if (*s != '/' && *s != '-') /* slash */ 898 break; 899 s++; 900 901 if (*s < '0' || *s > '9') /* third 1, 2, 4, or 5 digits */ 902 break; 903 n3 = (*s++ - '0'); 904 if (*s >= '0' && *s <= '9') 905 n3 = n3*10 + (*s++ - '0'); 906 907 if (*s >= '0' && *s <= '9') /* optional digits 3, 4, and 5 */ 908 { 909 n3 = n3*10 + (*s++ - '0'); 910 if (*s < '0' || *s > '9') 911 break; 912 n3 = n3*10 + (*s++ - '0'); 913 if (*s >= '0' && *s <= '9') 914 n3 = n3*10 + (*s++ - '0'); 915 } 916 917 if ((*s >= '0' && *s <= '9') || /* followed by non-alphanum */ 918 (*s >= 'A' && *s <= 'Z') || 919 (*s >= 'a' && *s <= 'z')) 920 break; 921 922 /* Ok, we parsed three 1-2 digit numbers, with / or - 923 between them. Now decide what the hell they are 924 (DD/MM/YY or MM/DD/YY or YY/MM/DD.) 925 */ 926 927 if (n1 > 31 || n1 == 0) /* must be YY/MM/DD */ 928 { 929 if (n2 > 12) break; 930 if (n3 > 31) break; 931 year = n1; 932 if (year < 70) 933 year += 2000; 934 else if (year < 100) 935 year += 1900; 936 month = (TIME_TOKEN)(n2 + ((int)TT_JAN) - 1); 937 date = n3; 938 rest = s; 939 break; 940 } 941 942 if (n1 > 12 && n2 > 12) /* illegal */ 943 { 944 rest = s; 945 break; 946 } 947 948 if (n3 < 70) 949 n3 += 2000; 950 else if (n3 < 100) 951 n3 += 1900; 952 953 if (n1 > 12) /* must be DD/MM/YY */ 954 { 955 date = n1; 956 month = (TIME_TOKEN)(n2 + ((int)TT_JAN) - 1); 957 year = n3; 958 } 959 else /* assume MM/DD/YY */ 960 { 961 /* #### In the ambiguous case, should we consult the 962 locale to find out the local default? */ 963 month = (TIME_TOKEN)(n1 + ((int)TT_JAN) - 1); 964 date = n2; 965 year = n3; 966 } 967 rest = s; 968 } 969 else if ((*end >= 'A' && *end <= 'Z') || 970 (*end >= 'a' && *end <= 'z')) 971 /* Digits followed by non-punctuation - what's that? */ 972 ; 973 else if ((end - rest) == 5) /* five digits is a year */ 974 year = (year < 0 975 ? ((rest[0]-'0')*10000L + 976 (rest[1]-'0')*1000L + 977 (rest[2]-'0')*100L + 978 (rest[3]-'0')*10L + 979 (rest[4]-'0')) 980 : year); 981 else if ((end - rest) == 4) /* four digits is a year */ 982 year = (year < 0 983 ? ((rest[0]-'0')*1000L + 984 (rest[1]-'0')*100L + 985 (rest[2]-'0')*10L + 986 (rest[3]-'0')) 987 : year); 988 else if ((end - rest) == 2) /* two digits - date or year */ 989 { 990 int n = ((rest[0]-'0')*10 + 991 (rest[1]-'0')); 992 /* If we don't have a date (day of the month) and we see a number 993 less than 32, then assume that is the date. 994 995 Otherwise, if we have a date and not a year, assume this is the 996 year. If it is less than 70, then assume it refers to the 21st 997 century. If it is two digits (>= 70), assume it refers to this 998 century. Otherwise, assume it refers to an unambiguous year. 999 1000 The world will surely end soon. 1001 */ 1002 if (date < 0 && n < 32) 1003 date = n; 1004 else if (year < 0) 1005 { 1006 if (n < 70) 1007 year = 2000 + n; 1008 else if (n < 100) 1009 year = 1900 + n; 1010 else 1011 year = n; 1012 } 1013 /* else what the hell is this. */ 1014 } 1015 else if ((end - rest) == 1) /* one digit - date */ 1016 date = (date < 0 ? (rest[0]-'0') : date); 1017 /* else, three or more than five digits - what's that? */ 1018 1019 break; 1020 } 1021 } 1022 1023 /* Skip to the end of this token, whether we parsed it or not. 1024 Tokens are delimited by whitespace, or ,;-/ 1025 But explicitly not :+-. 1026 */ 1027 while (*rest && 1028 *rest != ' ' && *rest != '\t' && 1029 *rest != ',' && *rest != ';' && 1030 *rest != '-' && *rest != '+' && 1031 *rest != '/' && 1032 *rest != '(' && *rest != ')' && *rest != '[' && *rest != ']') 1033 rest++; 1034 /* skip over uninteresting chars. */ 1035 SKIP_MORE: 1036 while (*rest && 1037 (*rest == ' ' || *rest == '\t' || 1038 *rest == ',' || *rest == ';' || *rest == '/' || 1039 *rest == '(' || *rest == ')' || *rest == '[' || *rest == ']')) 1040 rest++; 1041 1042 /* "-" is ignored at the beginning of a token if we have not yet 1043 parsed a year (e.g., the second "-" in "30-AUG-1966"), or if 1044 the character after the dash is not a digit. */ 1045 if (*rest == '-' && ((rest > string && isalpha(rest[-1]) && year < 0) 1046 || rest[1] < '0' || rest[1] > '9')) 1047 { 1048 rest++; 1049 goto SKIP_MORE; 1050 } 1051 1052 } 1053 1054 if (zone != TT_UNKNOWN && zone_offset == -1) 1055 { 1056 switch (zone) 1057 { 1058 case TT_PST: zone_offset = -8 * 60; break; 1059 case TT_PDT: zone_offset = -8 * 60; dst_offset = 1 * 60; break; 1060 case TT_MST: zone_offset = -7 * 60; break; 1061 case TT_MDT: zone_offset = -7 * 60; dst_offset = 1 * 60; break; 1062 case TT_CST: zone_offset = -6 * 60; break; 1063 case TT_CDT: zone_offset = -6 * 60; dst_offset = 1 * 60; break; 1064 case TT_EST: zone_offset = -5 * 60; break; 1065 case TT_EDT: zone_offset = -5 * 60; dst_offset = 1 * 60; break; 1066 case TT_AST: zone_offset = -4 * 60; break; 1067 case TT_NST: zone_offset = -3 * 60 - 30; break; 1068 case TT_GMT: zone_offset = 0 * 60; break; 1069 case TT_BST: zone_offset = 0 * 60; dst_offset = 1 * 60; break; 1070 case TT_MET: zone_offset = 1 * 60; break; 1071 case TT_EET: zone_offset = 2 * 60; break; 1072 case TT_JST: zone_offset = 9 * 60; break; 1073 default: 1074 PR_ASSERT (0); 1075 break; 1076 } 1077 } 1078 1079 /* If we didn't find a year, month, or day-of-the-month, we can't 1080 possibly parse this, and in fact, mktime() will do something random 1081 (I'm seeing it return "Tue Feb 5 06:28:16 2036", which is no doubt 1082 a numerologically significant date... */ 1083 if (month == TT_UNKNOWN || date == -1 || year == -1 || year > PR_INT16_MAX) 1084 return PR_FAILURE; 1085 1086 memset(result, 0, sizeof(*result)); 1087 if (sec != -1) 1088 result->tm_sec = sec; 1089 if (min != -1) 1090 result->tm_min = min; 1091 if (hour != -1) 1092 result->tm_hour = hour; 1093 if (date != -1) 1094 result->tm_mday = date; 1095 if (month != TT_UNKNOWN) 1096 result->tm_month = (((int)month) - ((int)TT_JAN)); 1097 if (year != -1) 1098 result->tm_year = year; 1099 if (dotw != TT_UNKNOWN) 1100 result->tm_wday = (((int)dotw) - ((int)TT_SUN)); 1101 /* 1102 * Mainly to compute wday and yday, but normalized time is also required 1103 * by the check below that works around a Visual C++ 2005 mktime problem. 1104 */ 1105 PR_NormalizeTime(result, PR_GMTParameters); 1106 /* The remaining work is to set the gmt and dst offsets in tm_params. */ 1107 1108 if (zone == TT_UNKNOWN && default_to_gmt) 1109 { 1110 /* No zone was specified, so pretend the zone was GMT. */ 1111 zone = TT_GMT; 1112 zone_offset = 0; 1113 } 1114 1115 if (zone_offset == -1) 1116 { 1117 /* no zone was specified, and we're to assume that everything 1118 is local. */ 1119 struct tm localTime; 1120 time_t secs; 1121 1122 PR_ASSERT(result->tm_month > -1 && 1123 result->tm_mday > 0 && 1124 result->tm_hour > -1 && 1125 result->tm_min > -1 && 1126 result->tm_sec > -1); 1127 1128 /* 1129 * To obtain time_t from a tm structure representing the local 1130 * time, we call mktime(). However, we need to see if we are 1131 * on 1-Jan-1970 or before. If we are, we can't call mktime() 1132 * because mktime() will crash on win16. In that case, we 1133 * calculate zone_offset based on the zone offset at 1134 * 00:00:00, 2 Jan 1970 GMT, and subtract zone_offset from the 1135 * date we are parsing to transform the date to GMT. We also 1136 * do so if mktime() returns (time_t) -1 (time out of range). 1137 */ 1138 1139 /* month, day, hours, mins and secs are always non-negative 1140 so we dont need to worry about them. */ 1141 if(result->tm_year >= 1970) 1142 { 1143 PRInt64 usec_per_sec; 1144 1145 localTime.tm_sec = result->tm_sec; 1146 localTime.tm_min = result->tm_min; 1147 localTime.tm_hour = result->tm_hour; 1148 localTime.tm_mday = result->tm_mday; 1149 localTime.tm_mon = result->tm_month; 1150 localTime.tm_year = result->tm_year - 1900; 1151 /* Set this to -1 to tell mktime "I don't care". If you set 1152 it to 0 or 1, you are making assertions about whether the 1153 date you are handing it is in daylight savings mode or not; 1154 and if you're wrong, it will "fix" it for you. */ 1155 localTime.tm_isdst = -1; 1156 1157#if _MSC_VER == 1400 /* 1400 = Visual C++ 2005 (8.0) */ 1158 /* 1159 * mktime will return (time_t) -1 if the input is a date 1160 * after 23:59:59, December 31, 3000, US Pacific Time (not 1161 * UTC as documented): 1162 * http://msdn.microsoft.com/en-us/library/d1y53h2a(VS.80).aspx 1163 * But if the year is 3001, mktime also invokes the invalid 1164 * parameter handler, causing the application to crash. This 1165 * problem has been reported in 1166 * http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=266036. 1167 * We avoid this crash by not calling mktime if the date is 1168 * out of range. To use a simple test that works in any time 1169 * zone, we consider year 3000 out of range as well. (See 1170 * bug 480740.) 1171 */ 1172 if (result->tm_year >= 3000) { 1173 /* Emulate what mktime would have done. */ 1174 errno = EINVAL; 1175 secs = (time_t) -1; 1176 } else { 1177 secs = mktime(&localTime); 1178 } 1179#else 1180 secs = mktime(&localTime); 1181#endif 1182 if (secs != (time_t) -1) 1183 { 1184 PRTime usecs64; 1185 LL_I2L(usecs64, secs); 1186 LL_I2L(usec_per_sec, PR_USEC_PER_SEC); 1187 LL_MUL(usecs64, usecs64, usec_per_sec); 1188 *result_imploded = usecs64; 1189 return PR_SUCCESS; 1190 } 1191 } 1192 1193 /* So mktime() can't handle this case. We assume the 1194 zone_offset for the date we are parsing is the same as 1195 the zone offset on 00:00:00 2 Jan 1970 GMT. */ 1196 secs = 86400; 1197 localtime_r(&secs, &localTime); 1198 zone_offset = localTime.tm_min 1199 + 60 * localTime.tm_hour 1200 + 1440 * (localTime.tm_mday - 2); 1201 } 1202 1203 result->tm_params.tp_gmt_offset = zone_offset * 60; 1204 result->tm_params.tp_dst_offset = dst_offset * 60; 1205 1206 *result_imploded = PR_ImplodeTime(result); 1207 return PR_SUCCESS; 1208} 1209