localtime.c revision 1.89
1/* $NetBSD: localtime.c,v 1.89 2014/10/15 15:13:45 christos Exp $ */ 2 3/* 4** This file is in the public domain, so clarified as of 5** 1996-06-05 by Arthur David Olson. 6*/ 7 8#include <sys/cdefs.h> 9#if defined(LIBC_SCCS) && !defined(lint) 10#if 0 11static char elsieid[] = "@(#)localtime.c 8.17"; 12#else 13__RCSID("$NetBSD: localtime.c,v 1.89 2014/10/15 15:13:45 christos Exp $"); 14#endif 15#endif /* LIBC_SCCS and not lint */ 16 17/* 18** Leap second handling from Bradley White. 19** POSIX-style TZ environment variable handling from Guy Harris. 20*/ 21 22/*LINTLIBRARY*/ 23 24#include "namespace.h" 25#include <assert.h> 26#define LOCALTIME_IMPLEMENTATION 27#include "private.h" 28 29#include "tzfile.h" 30#include "fcntl.h" 31#include "reentrant.h" 32 33#if NETBSD_INSPIRED 34# define NETBSD_INSPIRED_EXTERN 35#else 36# define NETBSD_INSPIRED_EXTERN static 37#endif 38 39#if defined(__weak_alias) 40__weak_alias(daylight,_daylight) 41__weak_alias(tzname,_tzname) 42#endif 43 44#ifndef TZ_ABBR_MAX_LEN 45#define TZ_ABBR_MAX_LEN 16 46#endif /* !defined TZ_ABBR_MAX_LEN */ 47 48#ifndef TZ_ABBR_CHAR_SET 49#define TZ_ABBR_CHAR_SET \ 50 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._" 51#endif /* !defined TZ_ABBR_CHAR_SET */ 52 53#ifndef TZ_ABBR_ERR_CHAR 54#define TZ_ABBR_ERR_CHAR '_' 55#endif /* !defined TZ_ABBR_ERR_CHAR */ 56 57/* 58** SunOS 4.1.1 headers lack O_BINARY. 59*/ 60 61#ifdef O_BINARY 62#define OPEN_MODE (O_RDONLY | O_BINARY | O_CLOEXEC) 63#endif /* defined O_BINARY */ 64#ifndef O_BINARY 65#define OPEN_MODE (O_RDONLY | O_CLOEXEC) 66#endif /* !defined O_BINARY */ 67 68#ifndef WILDABBR 69/* 70** Someone might make incorrect use of a time zone abbreviation: 71** 1. They might reference tzname[0] before calling tzset (explicitly 72** or implicitly). 73** 2. They might reference tzname[1] before calling tzset (explicitly 74** or implicitly). 75** 3. They might reference tzname[1] after setting to a time zone 76** in which Daylight Saving Time is never observed. 77** 4. They might reference tzname[0] after setting to a time zone 78** in which Standard Time is never observed. 79** 5. They might reference tm.TM_ZONE after calling offtime. 80** What's best to do in the above cases is open to debate; 81** for now, we just set things up so that in any of the five cases 82** WILDABBR is used. Another possibility: initialize tzname[0] to the 83** string "tzname[0] used before set", and similarly for the other cases. 84** And another: initialize tzname[0] to "ERA", with an explanation in the 85** manual page of what this "time zone abbreviation" means (doing this so 86** that tzname[0] has the "normal" length of three characters). 87*/ 88#define WILDABBR " " 89#endif /* !defined WILDABBR */ 90 91static const char wildabbr[] = WILDABBR; 92 93static const char gmt[] = "GMT"; 94 95/* 96** The DST rules to use if TZ has no rules and we can't load TZDEFRULES. 97** We default to US rules as of 1999-08-17. 98** POSIX 1003.1 section 8.1.1 says that the default DST rules are 99** implementation dependent; for historical reasons, US rules are a 100** common default. 101*/ 102#ifndef TZDEFRULESTRING 103#define TZDEFRULESTRING ",M4.1.0,M10.5.0" 104#endif /* !defined TZDEFDST */ 105 106struct ttinfo { /* time type information */ 107 int_fast32_t tt_gmtoff; /* UT offset in seconds */ 108 bool tt_isdst; /* used to set tm_isdst */ 109 int tt_abbrind; /* abbreviation list index */ 110 bool tt_ttisstd; /* transition is std time */ 111 bool tt_ttisgmt; /* transition is UT */ 112}; 113 114struct lsinfo { /* leap second information */ 115 time_t ls_trans; /* transition time */ 116 int_fast64_t ls_corr; /* correction to apply */ 117}; 118 119#define SMALLEST(a, b) (((a) < (b)) ? (a) : (b)) 120#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) 121 122#ifdef TZNAME_MAX 123#define MY_TZNAME_MAX TZNAME_MAX 124#endif /* defined TZNAME_MAX */ 125#ifndef TZNAME_MAX 126#define MY_TZNAME_MAX 255 127#endif /* !defined TZNAME_MAX */ 128 129#define state __state 130struct state { 131 int leapcnt; 132 int timecnt; 133 int typecnt; 134 int charcnt; 135 bool goback; 136 bool goahead; 137 time_t ats[TZ_MAX_TIMES]; 138 unsigned char types[TZ_MAX_TIMES]; 139 struct ttinfo ttis[TZ_MAX_TYPES]; 140 char chars[/*CONSTCOND*/BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, 141 sizeof gmt), (2 * (MY_TZNAME_MAX + 1)))]; 142 struct lsinfo lsis[TZ_MAX_LEAPS]; 143 int defaulttype; /* for early times or if no transitions */ 144}; 145 146struct rule { 147 int r_type; /* type of rule; see below */ 148 int r_day; /* day number of rule */ 149 int r_week; /* week number of rule */ 150 int r_mon; /* month number of rule */ 151 int_fast32_t r_time; /* transition time of rule */ 152}; 153 154#define JULIAN_DAY 0 /* Jn = Julian day */ 155#define DAY_OF_YEAR 1 /* n = day of year */ 156#define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d = month, week, day of week */ 157 158static struct tm *gmtsub(struct state const *, time_t const *, int_fast32_t, 159 struct tm *); 160static bool increment_overflow(int *, int); 161static bool increment_overflow_time(time_t *, int_fast32_t); 162static bool normalize_overflow32(int_fast32_t *, int *, int); 163static struct tm *timesub(time_t const *, int_fast32_t, struct state const *, 164 struct tm *); 165static bool typesequiv(struct state const *, int, int); 166static bool tzparse(char const *, struct state *, bool); 167 168static timezone_t lclptr; 169static timezone_t gmtptr; 170 171#ifndef TZ_STRLEN_MAX 172#define TZ_STRLEN_MAX 255 173#endif /* !defined TZ_STRLEN_MAX */ 174 175static char lcl_TZname[TZ_STRLEN_MAX + 1]; 176static int lcl_is_set; 177 178#if !defined(__LIBC12_SOURCE__) 179 180__aconst char * tzname[2] = { 181 (__aconst char *)__UNCONST(wildabbr), 182 (__aconst char *)__UNCONST(wildabbr) 183}; 184 185#else 186 187extern __aconst char * tzname[2]; 188 189#endif 190 191#ifdef _REENTRANT 192static rwlock_t lcl_lock = RWLOCK_INITIALIZER; 193#endif 194 195/* 196** Section 4.12.3 of X3.159-1989 requires that 197** Except for the strftime function, these functions [asctime, 198** ctime, gmtime, localtime] return values in one of two static 199** objects: a broken-down time structure and an array of char. 200** Thanks to Paul Eggert for noting this. 201*/ 202 203static struct tm tm; 204 205#ifdef USG_COMPAT 206#if !defined(__LIBC12_SOURCE__) 207long timezone = 0; 208int daylight = 0; 209#else 210extern int daylight; 211extern long timezone __RENAME(__timezone13); 212#endif 213#endif /* defined USG_COMPAT */ 214 215#ifdef ALTZONE 216long altzone = 0; 217#endif /* defined ALTZONE */ 218 219static int_fast32_t 220detzcode(const char *const codep) 221{ 222 int_fast32_t result; 223 int i; 224 225 result = (codep[0] & 0x80) ? -1 : 0; 226 for (i = 0; i < 4; ++i) 227 result = (result << 8) | (codep[i] & 0xff); 228 return result; 229} 230 231static int_fast64_t 232detzcode64(const char *const codep) 233{ 234 int_fast64_t result; 235 int i; 236 237 result = (codep[0] & 0x80) ? -1 : 0; 238 for (i = 0; i < 8; ++i) 239 result = (result << 8) | (codep[i] & 0xff); 240 return result; 241} 242 243const char * 244tzgetname(const timezone_t sp, int isdst) 245{ 246 int i; 247 for (i = 0; i < sp->timecnt; ++i) { 248 const struct ttinfo *const ttisp = &sp->ttis[sp->types[i]]; 249 250 if (ttisp->tt_isdst == isdst) 251 return &sp->chars[ttisp->tt_abbrind]; 252 } 253 errno = ESRCH; 254 return NULL; 255} 256 257static void 258settzname_z(timezone_t sp) 259{ 260 int i; 261 262 /* 263 ** Scrub the abbreviations. 264 ** First, replace bogus characters. 265 */ 266 for (i = 0; i < sp->charcnt; ++i) 267 if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL) 268 sp->chars[i] = TZ_ABBR_ERR_CHAR; 269 /* 270 ** Second, truncate long abbreviations. 271 */ 272 for (i = 0; i < sp->typecnt; ++i) { 273 const struct ttinfo * const ttisp = &sp->ttis[i]; 274 char * cp = &sp->chars[ttisp->tt_abbrind]; 275 276 if (strlen(cp) > TZ_ABBR_MAX_LEN && 277 strcmp(cp, GRANDPARENTED) != 0) 278 *(cp + TZ_ABBR_MAX_LEN) = '\0'; 279 } 280} 281 282static void 283settzname(void) 284{ 285 timezone_t const sp = lclptr; 286 int i; 287 288 tzname[0] = (__aconst char *)__UNCONST(wildabbr); 289 tzname[1] = (__aconst char *)__UNCONST(wildabbr); 290#ifdef USG_COMPAT 291 daylight = 0; 292 timezone = 0; 293#endif /* defined USG_COMPAT */ 294#ifdef ALTZONE 295 altzone = 0; 296#endif /* defined ALTZONE */ 297 if (sp == NULL) { 298 tzname[0] = tzname[1] = (__aconst char *)__UNCONST(gmt); 299 return; 300 } 301 /* 302 ** And to get the latest zone names into tzname. . . 303 */ 304 for (i = 0; i < sp->typecnt; ++i) { 305 const struct ttinfo * const ttisp = &sp->ttis[i]; 306 307 tzname[ttisp->tt_isdst] = &sp->chars[ttisp->tt_abbrind]; 308#ifdef USG_COMPAT 309 if (ttisp->tt_isdst) 310 daylight = 1; 311 if (!ttisp->tt_isdst) 312 timezone = -(ttisp->tt_gmtoff); 313#endif /* defined USG_COMPAT */ 314#ifdef ALTZONE 315 if (ttisp->tt_isdst) 316 altzone = -(ttisp->tt_gmtoff); 317#endif /* defined ALTZONE */ 318 } 319 settzname_z(sp); 320} 321 322static bool 323differ_by_repeat(const time_t t1, const time_t t0) 324{ 325 if (TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS) 326 return 0; 327 return (int_fast64_t)t1 - (int_fast64_t)t0 == SECSPERREPEAT; 328} 329 330static bool 331tzload(const char *name, timezone_t sp, bool doextend) 332{ 333 const char * p; 334 int i; 335 int fid; 336 int stored; 337 ssize_t nread; 338 typedef union { 339 struct tzhead tzhead; 340 char buf[2 * sizeof(struct tzhead) + 341 2 * sizeof *sp + 342 4 * TZ_MAX_TIMES]; 343 } u_t; 344 union local_storage { 345 /* 346 ** Section 4.9.1 of the C standard says that 347 ** "FILENAME_MAX expands to an integral constant expression 348 ** that is the size needed for an array of char large enough 349 ** to hold the longest file name string that the implementation 350 ** guarantees can be opened." 351 */ 352 char fullname[FILENAME_MAX + 1]; 353 354 /* The main part of the storage for this function. */ 355 struct { 356 u_t u; 357 struct state st; 358 } u; 359 }; 360 char *fullname; 361 u_t *up; 362 bool doaccess; 363 union local_storage *lsp; 364 lsp = malloc(sizeof *lsp); 365 if (!lsp) 366 return false; 367 fullname = lsp->fullname; 368 up = &lsp->u.u; 369 370 sp->goback = sp->goahead = false; 371 372 if (! name) { 373 name = TZDEFAULT; 374 if (! name) 375 goto oops; 376 } 377 378 if (name[0] == ':') 379 ++name; 380 doaccess = name[0] == '/'; 381 if (!doaccess) { 382 p = TZDIR; 383 if (! p || sizeof lsp->fullname - 1 <= strlen(p) + strlen(name)) 384 goto oops; 385 strcpy(fullname, p); 386 strcat(fullname, "/"); 387 strcat(fullname, name); 388 /* Set doaccess if '.' (as in "../") shows up in name. */ 389 if (strchr(name, '.')) 390 doaccess = true; 391 name = fullname; 392 } 393 if (doaccess && access(name, R_OK) != 0) 394 goto oops; 395 396 fid = open(name, OPEN_MODE); 397 if (fid < 0) 398 goto oops; 399 nread = read(fid, up->buf, sizeof up->buf); 400 if (close(fid) < 0 || nread <= 0) 401 goto oops; 402 for (stored = 4; stored <= 8; stored *= 2) { 403 int_fast32_t ttisstdcnt = detzcode(up->tzhead.tzh_ttisstdcnt); 404 int_fast32_t ttisgmtcnt = detzcode(up->tzhead.tzh_ttisgmtcnt); 405 int_fast32_t leapcnt = detzcode(up->tzhead.tzh_leapcnt); 406 int_fast32_t timecnt = detzcode(up->tzhead.tzh_timecnt); 407 int_fast32_t typecnt = detzcode(up->tzhead.tzh_typecnt); 408 int_fast32_t charcnt = detzcode(up->tzhead.tzh_charcnt); 409 p = up->tzhead.tzh_charcnt + sizeof up->tzhead.tzh_charcnt; 410 if (! (0 <= leapcnt && leapcnt < TZ_MAX_LEAPS 411 && 0 < typecnt && typecnt < TZ_MAX_TYPES 412 && 0 <= timecnt && timecnt < TZ_MAX_TIMES 413 && 0 <= charcnt && charcnt < TZ_MAX_CHARS 414 && (ttisstdcnt == typecnt || ttisstdcnt == 0) 415 && (ttisgmtcnt == typecnt || ttisgmtcnt == 0))) 416 goto oops; 417 if (nread - (p - up->buf) 418 < (timecnt * stored /* ats */ 419 + timecnt /* types */ 420 + typecnt * 6 /* ttinfos */ 421 + charcnt /* chars */ 422 + leapcnt * (stored + 4) /* lsinfos */ 423 + ttisstdcnt /* ttisstds */ 424 + ttisgmtcnt)) /* ttisgmts */ 425 goto oops; 426 sp->leapcnt = leapcnt; 427 sp->timecnt = timecnt; 428 sp->typecnt = typecnt; 429 sp->charcnt = charcnt; 430 431 /* Read transitions, discarding those out of time_t range. 432 But pretend the last transition before time_t_min 433 occurred at time_t_min. */ 434 timecnt = 0; 435 for (i = 0; i < sp->timecnt; ++i) { 436 int_fast64_t at 437 = stored == 4 ? detzcode(p) : detzcode64(p); 438 sp->types[i] = at <= time_t_max; 439 if (sp->types[i]) { 440 time_t attime 441 = ((TYPE_SIGNED(time_t) ? 442 at < time_t_min : at < 0) 443 ? time_t_min : (time_t)at); 444 if (timecnt && attime <= sp->ats[timecnt - 1]) { 445 if (attime < sp->ats[timecnt - 1]) 446 goto oops; 447 sp->types[i - 1] = 0; 448 timecnt--; 449 } 450 sp->ats[timecnt++] = attime; 451 } 452 p += stored; 453 } 454 455 timecnt = 0; 456 for (i = 0; i < sp->timecnt; ++i) { 457 unsigned char typ = *p++; 458 if (sp->typecnt <= typ) 459 goto oops; 460 if (sp->types[i]) 461 sp->types[timecnt++] = typ; 462 } 463 sp->timecnt = timecnt; 464 for (i = 0; i < sp->typecnt; ++i) { 465 struct ttinfo * ttisp; 466 unsigned char isdst, abbrind; 467 468 ttisp = &sp->ttis[i]; 469 ttisp->tt_gmtoff = detzcode(p); 470 p += 4; 471 isdst = *p++; 472 if (! (isdst < 2)) 473 goto oops; 474 ttisp->tt_isdst = isdst; 475 abbrind = *p++; 476 if (! (abbrind < sp->charcnt)) 477 goto oops; 478 ttisp->tt_abbrind = abbrind; 479 } 480 for (i = 0; i < sp->charcnt; ++i) 481 sp->chars[i] = *p++; 482 sp->chars[i] = '\0'; /* ensure '\0' at end */ 483 484 /* Read leap seconds, discarding those out of time_t range. */ 485 leapcnt = 0; 486 for (i = 0; i < sp->leapcnt; ++i) { 487 int_fast64_t tr = stored == 4 ? detzcode(p) : 488 detzcode64(p); 489 int_fast32_t corr = detzcode(p + stored); 490 p += stored + 4; 491 if (tr <= time_t_max) { 492 time_t trans = ((TYPE_SIGNED(time_t) ? 493 tr < time_t_min : tr < 0) 494 ? time_t_min : (time_t)tr); 495 if (leapcnt && trans <= 496 sp->lsis[leapcnt - 1].ls_trans) { 497 if (trans < 498 sp->lsis[leapcnt - 1].ls_trans) 499 goto oops; 500 leapcnt--; 501 } 502 sp->lsis[leapcnt].ls_trans = trans; 503 sp->lsis[leapcnt].ls_corr = corr; 504 leapcnt++; 505 } 506 } 507 sp->leapcnt = leapcnt; 508 509 for (i = 0; i < sp->typecnt; ++i) { 510 struct ttinfo * ttisp; 511 512 ttisp = &sp->ttis[i]; 513 if (ttisstdcnt == 0) 514 ttisp->tt_ttisstd = false; 515 else { 516 if (*p != true && *p != false) 517 goto oops; 518 ttisp->tt_ttisstd = *p++; 519 } 520 } 521 for (i = 0; i < sp->typecnt; ++i) { 522 struct ttinfo * ttisp; 523 524 ttisp = &sp->ttis[i]; 525 if (ttisgmtcnt == 0) 526 ttisp->tt_ttisgmt = false; 527 else { 528 if (*p != true && *p != false) 529 goto oops; 530 ttisp->tt_ttisgmt = *p++; 531 } 532 } 533 /* 534 ** If this is an old file, we're done. 535 */ 536 if (up->tzhead.tzh_version[0] == '\0') 537 break; 538 nread -= p - up->buf; 539 for (i = 0; i < nread; ++i) 540 up->buf[i] = p[i]; 541 /* 542 ** If this is a signed narrow time_t system, we're done. 543 */ 544 if (TYPE_SIGNED(time_t) && stored >= (int) sizeof(time_t)) 545 break; 546 } 547 if (doextend && nread > 2 && 548 up->buf[0] == '\n' && up->buf[nread - 1] == '\n' && 549 sp->typecnt + 2 <= TZ_MAX_TYPES) { 550 struct state *ts = &lsp->u.st; 551 552 up->buf[nread - 1] = '\0'; 553 if (tzparse(&up->buf[1], ts, false) 554 && ts->typecnt == 2 555 && sp->charcnt + ts->charcnt <= TZ_MAX_CHARS) { 556 for (i = 0; i < 2; ++i) 557 ts->ttis[i].tt_abbrind += 558 sp->charcnt; 559 for (i = 0; i < ts->charcnt; ++i) 560 sp->chars[sp->charcnt++] = 561 ts->chars[i]; 562 i = 0; 563 while (i < ts->timecnt && 564 ts->ats[i] <= 565 sp->ats[sp->timecnt - 1]) 566 ++i; 567 while (i < ts->timecnt && 568 sp->timecnt < TZ_MAX_TIMES) { 569 sp->ats[sp->timecnt] = 570 ts->ats[i]; 571 sp->types[sp->timecnt] = 572 sp->typecnt + 573 ts->types[i]; 574 ++sp->timecnt; 575 ++i; 576 } 577 sp->ttis[sp->typecnt++] = ts->ttis[0]; 578 sp->ttis[sp->typecnt++] = ts->ttis[1]; 579 } 580 } 581 if (sp->timecnt > 1) { 582 for (i = 1; i < sp->timecnt; ++i) 583 if (typesequiv(sp, sp->types[i], sp->types[0]) && 584 differ_by_repeat(sp->ats[i], sp->ats[0])) { 585 sp->goback = true; 586 break; 587 } 588 for (i = sp->timecnt - 2; i >= 0; --i) 589 if (typesequiv(sp, sp->types[sp->timecnt - 1], 590 sp->types[i]) && 591 differ_by_repeat(sp->ats[sp->timecnt - 1], 592 sp->ats[i])) { 593 sp->goahead = true; 594 break; 595 } 596 } 597 /* 598 ** If type 0 is is unused in transitions, 599 ** it's the type to use for early times. 600 */ 601 for (i = 0; i < sp->timecnt; ++i) 602 if (sp->types[i] == 0) 603 break; 604 i = i < sp->timecnt ? -1 : 0; 605 /* 606 ** Absent the above, 607 ** if there are transition times 608 ** and the first transition is to a daylight time 609 ** find the standard type less than and closest to 610 ** the type of the first transition. 611 */ 612 if (i < 0 && sp->timecnt > 0 && sp->ttis[sp->types[0]].tt_isdst) { 613 i = sp->types[0]; 614 while (--i >= 0) 615 if (!sp->ttis[i].tt_isdst) 616 break; 617 } 618 /* 619 ** If no result yet, find the first standard type. 620 ** If there is none, punt to type zero. 621 */ 622 if (i < 0) { 623 i = 0; 624 while (sp->ttis[i].tt_isdst) 625 if (++i >= sp->typecnt) { 626 i = 0; 627 break; 628 } 629 } 630 sp->defaulttype = i; 631 free(up); 632 return true; 633oops: 634 free(up); 635 return false; 636} 637 638static bool 639typesequiv(struct state const *sp, int a, int b) 640{ 641 bool result; 642 643 if (sp == NULL || 644 a < 0 || a >= sp->typecnt || 645 b < 0 || b >= sp->typecnt) 646 result = false; 647 else { 648 const struct ttinfo * ap = &sp->ttis[a]; 649 const struct ttinfo * bp = &sp->ttis[b]; 650 result = ap->tt_gmtoff == bp->tt_gmtoff && 651 ap->tt_isdst == bp->tt_isdst && 652 ap->tt_ttisstd == bp->tt_ttisstd && 653 ap->tt_ttisgmt == bp->tt_ttisgmt && 654 strcmp(&sp->chars[ap->tt_abbrind], 655 &sp->chars[bp->tt_abbrind]) == 0; 656 } 657 return result; 658} 659 660static const int mon_lengths[2][MONSPERYEAR] = { 661 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 662 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } 663}; 664 665static const int year_lengths[2] = { 666 DAYSPERNYEAR, DAYSPERLYEAR 667}; 668 669/* 670** Given a pointer into a time zone string, scan until a character that is not 671** a valid character in a zone name is found. Return a pointer to that 672** character. 673*/ 674 675static const char * ATTRIBUTE_PURE 676getzname(const char *strp) 677{ 678 char c; 679 680 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && 681 c != '+') 682 ++strp; 683 return strp; 684} 685 686/* 687** Given a pointer into an extended time zone string, scan until the ending 688** delimiter of the zone name is located. Return a pointer to the delimiter. 689** 690** As with getzname above, the legal character set is actually quite 691** restricted, with other characters producing undefined results. 692** We don't do any checking here; checking is done later in common-case code. 693*/ 694 695static const char * ATTRIBUTE_PURE 696getqzname(const char *strp, const int delim) 697{ 698 int c; 699 700 while ((c = *strp) != '\0' && c != delim) 701 ++strp; 702 return strp; 703} 704 705/* 706** Given a pointer into a time zone string, extract a number from that string. 707** Check that the number is within a specified range; if it is not, return 708** NULL. 709** Otherwise, return a pointer to the first character not part of the number. 710*/ 711 712static const char * 713getnum(const char *strp, int *const nump, const int min, const int max) 714{ 715 char c; 716 int num; 717 718 if (strp == NULL || !is_digit(c = *strp)) { 719 errno = EINVAL; 720 return NULL; 721 } 722 num = 0; 723 do { 724 num = num * 10 + (c - '0'); 725 if (num > max) { 726 errno = EOVERFLOW; 727 return NULL; /* illegal value */ 728 } 729 c = *++strp; 730 } while (is_digit(c)); 731 if (num < min) { 732 errno = EINVAL; 733 return NULL; /* illegal value */ 734 } 735 *nump = num; 736 return strp; 737} 738 739/* 740** Given a pointer into a time zone string, extract a number of seconds, 741** in hh[:mm[:ss]] form, from the string. 742** If any error occurs, return NULL. 743** Otherwise, return a pointer to the first character not part of the number 744** of seconds. 745*/ 746 747static const char * 748getsecs(const char *strp, int_fast32_t *const secsp) 749{ 750 int num; 751 752 /* 753 ** 'HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like 754 ** "M10.4.6/26", which does not conform to Posix, 755 ** but which specifies the equivalent of 756 ** "02:00 on the first Sunday on or after 23 Oct". 757 */ 758 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); 759 if (strp == NULL) 760 return NULL; 761 *secsp = num * (int_fast32_t) SECSPERHOUR; 762 if (*strp == ':') { 763 ++strp; 764 strp = getnum(strp, &num, 0, MINSPERHOUR - 1); 765 if (strp == NULL) 766 return NULL; 767 *secsp += num * SECSPERMIN; 768 if (*strp == ':') { 769 ++strp; 770 /* 'SECSPERMIN' allows for leap seconds. */ 771 strp = getnum(strp, &num, 0, SECSPERMIN); 772 if (strp == NULL) 773 return NULL; 774 *secsp += num; 775 } 776 } 777 return strp; 778} 779 780/* 781** Given a pointer into a time zone string, extract an offset, in 782** [+-]hh[:mm[:ss]] form, from the string. 783** If any error occurs, return NULL. 784** Otherwise, return a pointer to the first character not part of the time. 785*/ 786 787static const char * 788getoffset(const char *strp, int_fast32_t *const offsetp) 789{ 790 bool neg = false; 791 792 if (*strp == '-') { 793 neg = true; 794 ++strp; 795 } else if (*strp == '+') 796 ++strp; 797 strp = getsecs(strp, offsetp); 798 if (strp == NULL) 799 return NULL; /* illegal time */ 800 if (neg) 801 *offsetp = -*offsetp; 802 return strp; 803} 804 805/* 806** Given a pointer into a time zone string, extract a rule in the form 807** date[/time]. See POSIX section 8 for the format of "date" and "time". 808** If a valid rule is not found, return NULL. 809** Otherwise, return a pointer to the first character not part of the rule. 810*/ 811 812static const char * 813getrule(const char *strp, struct rule *const rulep) 814{ 815 if (*strp == 'J') { 816 /* 817 ** Julian day. 818 */ 819 rulep->r_type = JULIAN_DAY; 820 ++strp; 821 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); 822 } else if (*strp == 'M') { 823 /* 824 ** Month, week, day. 825 */ 826 rulep->r_type = MONTH_NTH_DAY_OF_WEEK; 827 ++strp; 828 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); 829 if (strp == NULL) 830 return NULL; 831 if (*strp++ != '.') 832 return NULL; 833 strp = getnum(strp, &rulep->r_week, 1, 5); 834 if (strp == NULL) 835 return NULL; 836 if (*strp++ != '.') 837 return NULL; 838 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); 839 } else if (is_digit(*strp)) { 840 /* 841 ** Day of year. 842 */ 843 rulep->r_type = DAY_OF_YEAR; 844 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); 845 } else return NULL; /* invalid format */ 846 if (strp == NULL) 847 return NULL; 848 if (*strp == '/') { 849 /* 850 ** Time specified. 851 */ 852 ++strp; 853 strp = getoffset(strp, &rulep->r_time); 854 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ 855 return strp; 856} 857 858/* 859** Given a year, a rule, and the offset from UT at the time that rule takes 860** effect, calculate the year-relative time that rule takes effect. 861*/ 862 863static int_fast32_t ATTRIBUTE_PURE 864transtime(const int year, const struct rule *const rulep, 865 const int_fast32_t offset) 866{ 867 bool leapyear; 868 int_fast32_t value; 869 int i; 870 int d, m1, yy0, yy1, yy2, dow; 871 872 INITIALIZE(value); 873 leapyear = isleap(year); 874 switch (rulep->r_type) { 875 876 case JULIAN_DAY: 877 /* 878 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap 879 ** years. 880 ** In non-leap years, or if the day number is 59 or less, just 881 ** add SECSPERDAY times the day number-1 to the time of 882 ** January 1, midnight, to get the day. 883 */ 884 value = (rulep->r_day - 1) * SECSPERDAY; 885 if (leapyear && rulep->r_day >= 60) 886 value += SECSPERDAY; 887 break; 888 889 case DAY_OF_YEAR: 890 /* 891 ** n - day of year. 892 ** Just add SECSPERDAY times the day number to the time of 893 ** January 1, midnight, to get the day. 894 */ 895 value = rulep->r_day * SECSPERDAY; 896 break; 897 898 case MONTH_NTH_DAY_OF_WEEK: 899 /* 900 ** Mm.n.d - nth "dth day" of month m. 901 */ 902 903 /* 904 ** Use Zeller's Congruence to get day-of-week of first day of 905 ** month. 906 */ 907 m1 = (rulep->r_mon + 9) % 12 + 1; 908 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; 909 yy1 = yy0 / 100; 910 yy2 = yy0 % 100; 911 dow = ((26 * m1 - 2) / 10 + 912 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; 913 if (dow < 0) 914 dow += DAYSPERWEEK; 915 916 /* 917 ** "dow" is the day-of-week of the first day of the month. Get 918 ** the day-of-month (zero-origin) of the first "dow" day of the 919 ** month. 920 */ 921 d = rulep->r_day - dow; 922 if (d < 0) 923 d += DAYSPERWEEK; 924 for (i = 1; i < rulep->r_week; ++i) { 925 if (d + DAYSPERWEEK >= 926 mon_lengths[leapyear][rulep->r_mon - 1]) 927 break; 928 d += DAYSPERWEEK; 929 } 930 931 /* 932 ** "d" is the day-of-month (zero-origin) of the day we want. 933 */ 934 value = d * SECSPERDAY; 935 for (i = 0; i < rulep->r_mon - 1; ++i) 936 value += mon_lengths[leapyear][i] * SECSPERDAY; 937 break; 938 } 939 940 /* 941 ** "value" is the year-relative time of 00:00:00 UT on the day in 942 ** question. To get the year-relative time of the specified local 943 ** time on that day, add the transition time and the current offset 944 ** from UT. 945 */ 946 return value + rulep->r_time + offset; 947} 948 949/* 950** Given a POSIX section 8-style TZ string, fill in the rule tables as 951** appropriate. 952*/ 953 954static bool 955tzparse(const char *name, timezone_t sp, 956 bool lastditch) 957{ 958 const char * stdname; 959 const char * dstname; 960 size_t stdlen; 961 size_t dstlen; 962 int_fast32_t stdoffset; 963 int_fast32_t dstoffset; 964 char * cp; 965 bool load_ok; 966 967 dstname = NULL; /* XXX gcc */ 968 stdname = name; 969 if (lastditch) { 970 stdlen = strlen(name); /* length of standard zone name */ 971 name += stdlen; 972 if (stdlen >= sizeof sp->chars) 973 stdlen = (sizeof sp->chars) - 1; 974 stdoffset = 0; 975 } else { 976 if (*name == '<') { 977 name++; 978 stdname = name; 979 name = getqzname(name, '>'); 980 if (*name != '>') 981 return false; 982 stdlen = name - stdname; 983 name++; 984 } else { 985 name = getzname(name); 986 stdlen = name - stdname; 987 } 988 if (*name == '\0') 989 return false; 990 name = getoffset(name, &stdoffset); 991 if (name == NULL) 992 return false; 993 } 994 load_ok = tzload(TZDEFRULES, sp, false); 995 if (!load_ok) 996 sp->leapcnt = 0; /* so, we're off a little */ 997 if (*name != '\0') { 998 if (*name == '<') { 999 dstname = ++name; 1000 name = getqzname(name, '>'); 1001 if (*name != '>') 1002 return false; 1003 dstlen = name - dstname; 1004 name++; 1005 } else { 1006 dstname = name; 1007 name = getzname(name); 1008 dstlen = name - dstname; /* length of DST zone name */ 1009 } 1010 if (*name != '\0' && *name != ',' && *name != ';') { 1011 name = getoffset(name, &dstoffset); 1012 if (name == NULL) 1013 return false; 1014 } else dstoffset = stdoffset - SECSPERHOUR; 1015 if (*name == '\0' && !load_ok) 1016 name = TZDEFRULESTRING; 1017 if (*name == ',' || *name == ';') { 1018 struct rule start; 1019 struct rule end; 1020 int year; 1021 int yearlim; 1022 int timecnt; 1023 time_t janfirst; 1024 1025 ++name; 1026 if ((name = getrule(name, &start)) == NULL) 1027 return false; 1028 if (*name++ != ',') 1029 return false; 1030 if ((name = getrule(name, &end)) == NULL) 1031 return false; 1032 if (*name != '\0') 1033 return false; 1034 sp->typecnt = 2; /* standard time and DST */ 1035 /* 1036 ** Two transitions per year, from EPOCH_YEAR forward. 1037 */ 1038 memset(sp->ttis, 0, sizeof(sp->ttis)); 1039 sp->ttis[0].tt_gmtoff = -dstoffset; 1040 sp->ttis[0].tt_isdst = true; 1041 sp->ttis[0].tt_abbrind = (int)(stdlen + 1); 1042 sp->ttis[1].tt_gmtoff = -stdoffset; 1043 sp->ttis[1].tt_isdst = false; 1044 sp->ttis[1].tt_abbrind = 0; 1045 sp->defaulttype = 0; 1046 timecnt = 0; 1047 janfirst = 0; 1048 yearlim = EPOCH_YEAR + YEARSPERREPEAT; 1049 for (year = EPOCH_YEAR; year < yearlim; year++) { 1050 int_fast32_t 1051 starttime = transtime(year, &start, stdoffset), 1052 endtime = transtime(year, &end, dstoffset); 1053 int_fast32_t 1054 yearsecs = (year_lengths[isleap(year)] 1055 * SECSPERDAY); 1056 bool reversed = endtime < starttime; 1057 if (reversed) { 1058 int_fast32_t swap = starttime; 1059 starttime = endtime; 1060 endtime = swap; 1061 } 1062 if (reversed 1063 || (starttime < endtime 1064 && (endtime - starttime 1065 < (yearsecs 1066 + (stdoffset - dstoffset))))) { 1067 if (TZ_MAX_TIMES - 2 < timecnt) 1068 break; 1069 yearlim = year + YEARSPERREPEAT + 1; 1070 sp->ats[timecnt] = janfirst; 1071 if (increment_overflow_time 1072 (&sp->ats[timecnt], starttime)) 1073 break; 1074 sp->types[timecnt++] = reversed; 1075 sp->ats[timecnt] = janfirst; 1076 if (increment_overflow_time 1077 (&sp->ats[timecnt], endtime)) 1078 break; 1079 sp->types[timecnt++] = !reversed; 1080 } 1081 if (increment_overflow_time(&janfirst, yearsecs)) 1082 break; 1083 } 1084 sp->timecnt = timecnt; 1085 if (!timecnt) 1086 sp->typecnt = 1; /* Perpetual DST. */ 1087 } else { 1088 int_fast32_t theirstdoffset; 1089 int_fast32_t theirdstoffset; 1090 int_fast32_t theiroffset; 1091 bool isdst; 1092 int i; 1093 int j; 1094 1095 if (*name != '\0') 1096 return false; 1097 /* 1098 ** Initial values of theirstdoffset and theirdstoffset. 1099 */ 1100 theirstdoffset = 0; 1101 for (i = 0; i < sp->timecnt; ++i) { 1102 j = sp->types[i]; 1103 if (!sp->ttis[j].tt_isdst) { 1104 theirstdoffset = 1105 -sp->ttis[j].tt_gmtoff; 1106 break; 1107 } 1108 } 1109 theirdstoffset = 0; 1110 for (i = 0; i < sp->timecnt; ++i) { 1111 j = sp->types[i]; 1112 if (sp->ttis[j].tt_isdst) { 1113 theirdstoffset = 1114 -sp->ttis[j].tt_gmtoff; 1115 break; 1116 } 1117 } 1118 /* 1119 ** Initially we're assumed to be in standard time. 1120 */ 1121 isdst = false; 1122 theiroffset = theirstdoffset; 1123 /* 1124 ** Now juggle transition times and types 1125 ** tracking offsets as you do. 1126 */ 1127 for (i = 0; i < sp->timecnt; ++i) { 1128 j = sp->types[i]; 1129 sp->types[i] = sp->ttis[j].tt_isdst; 1130 if (sp->ttis[j].tt_ttisgmt) { 1131 /* No adjustment to transition time */ 1132 } else { 1133 /* 1134 ** If summer time is in effect, and the 1135 ** transition time was not specified as 1136 ** standard time, add the summer time 1137 ** offset to the transition time; 1138 ** otherwise, add the standard time 1139 ** offset to the transition time. 1140 */ 1141 /* 1142 ** Transitions from DST to DDST 1143 ** will effectively disappear since 1144 ** POSIX provides for only one DST 1145 ** offset. 1146 */ 1147 if (isdst && !sp->ttis[j].tt_ttisstd) { 1148 sp->ats[i] += (time_t) 1149 (dstoffset - theirdstoffset); 1150 } else { 1151 sp->ats[i] += (time_t) 1152 (stdoffset - theirstdoffset); 1153 } 1154 } 1155 theiroffset = -sp->ttis[j].tt_gmtoff; 1156 if (sp->ttis[j].tt_isdst) 1157 theirstdoffset = theiroffset; 1158 else theirdstoffset = theiroffset; 1159 } 1160 /* 1161 ** Finally, fill in ttis. 1162 */ 1163 memset(sp->ttis, 0, sizeof(sp->ttis)); 1164 sp->ttis[0].tt_gmtoff = -stdoffset; 1165 sp->ttis[0].tt_isdst = false; 1166 sp->ttis[0].tt_abbrind = 0; 1167 sp->ttis[1].tt_gmtoff = -dstoffset; 1168 sp->ttis[1].tt_isdst = true; 1169 sp->ttis[1].tt_abbrind = (int)(stdlen + 1); 1170 sp->typecnt = 2; 1171 sp->defaulttype = 0; 1172 } 1173 } else { 1174 dstlen = 0; 1175 sp->typecnt = 1; /* only standard time */ 1176 sp->timecnt = 0; 1177 memset(sp->ttis, 0, sizeof(sp->ttis)); 1178 sp->ttis[0].tt_gmtoff = -stdoffset; 1179 sp->ttis[0].tt_isdst = false; 1180 sp->ttis[0].tt_abbrind = 0; 1181 sp->defaulttype = 0; 1182 } 1183 sp->charcnt = (int)(stdlen + 1); 1184 if (dstlen != 0) 1185 sp->charcnt += (int)(dstlen + 1); 1186 if ((size_t) sp->charcnt > sizeof sp->chars) 1187 return false; 1188 cp = sp->chars; 1189 (void) memcpy(cp, stdname, stdlen); 1190 cp += stdlen; 1191 *cp++ = '\0'; 1192 if (dstlen != 0) { 1193 (void) memcpy(cp, dstname, dstlen); 1194 *(cp + dstlen) = '\0'; 1195 } 1196 return true; 1197} 1198 1199static void 1200gmtload(struct state *const sp) 1201{ 1202 if (! tzload(gmt, sp, true)) 1203 (void) tzparse(gmt, sp, true); 1204} 1205 1206static struct state * 1207zoneinit(struct state *sp, char const *name) 1208{ 1209 if (!sp) 1210 return NULL; 1211 if (name && ! name[0]) { 1212 /* 1213 ** User wants it fast rather than right. 1214 */ 1215 sp->leapcnt = 0; /* so, we're off a little */ 1216 sp->timecnt = 0; 1217 sp->typecnt = 0; 1218 sp->ttis[0].tt_isdst = 0; 1219 sp->ttis[0].tt_gmtoff = 0; 1220 sp->ttis[0].tt_abbrind = 0; 1221 strcpy(sp->chars, gmt); 1222 return sp; 1223 } 1224 if (! (tzload(name, sp, true) 1225 || (name && name[0] != ':' && tzparse(name, sp, false)))) 1226 return NULL; 1227 return sp; 1228} 1229 1230static void 1231tzsetlcl(char const *name) 1232{ 1233 int lcl = name ? strlen(name) < sizeof lcl_TZname : -1; 1234 if (lcl < 0 ? lcl_is_set < 0 1235 : 0 < lcl_is_set && strcmp(lcl_TZname, name) == 0) 1236 return; 1237 if (0 < lcl) 1238 (void)strcpy(lcl_TZname, name); 1239 1240 if (! lclptr) { 1241 struct state *sp = malloc(sizeof *lclptr); 1242 if (!zoneinit(sp, name)) { 1243 free(sp); 1244 return; 1245 } 1246 lclptr = sp; 1247 } 1248 settzname(); 1249 lcl_is_set = lcl; 1250} 1251 1252#ifdef STD_INSPIRED 1253void 1254tzsetwall(void) 1255{ 1256 rwlock_wrlock(&lcl_lock); 1257 tzsetlcl(NULL); 1258 rwlock_unlock(&lcl_lock); 1259} 1260#endif 1261 1262static void 1263tzset_unlocked(void) 1264{ 1265 tzsetlcl(getenv("TZ")); 1266} 1267 1268void 1269tzset(void) 1270{ 1271 rwlock_wrlock(&lcl_lock); 1272 tzset_unlocked(); 1273 rwlock_unlock(&lcl_lock); 1274} 1275 1276static void 1277gmtcheck(void) 1278{ 1279 static bool gmt_is_set; 1280 rwlock_wrlock(&lcl_lock); 1281 if (! gmt_is_set) { 1282 gmtptr = malloc(sizeof *gmtptr); 1283 if (gmtptr) 1284 gmtload(gmtptr); 1285 gmt_is_set = true; 1286 } 1287 rwlock_unlock(&lcl_lock); 1288} 1289 1290#if NETBSD_INSPIRED 1291 1292timezone_t 1293tzalloc(const char *name) 1294{ 1295 timezone_t sp = malloc(sizeof *sp); 1296 timezone_t tp = sp ? zoneinit(sp, name) : sp; 1297 if (!tp) 1298 free(sp); 1299 return tp; 1300} 1301 1302void 1303tzfree(timezone_t sp) 1304{ 1305 free(sp); 1306} 1307 1308/* 1309** NetBSD 6.1.4 has ctime_rz, but omit it because POSIX says ctime and 1310** ctime_r are obsolescent and have potential security problems that 1311** ctime_rz would share. Callers can instead use localtime_rz + strftime. 1312** 1313** NetBSD 6.1.4 has tzgetname, but omit it because it doesn't work 1314** in zones with three or more time zone abbreviations. 1315** Callers can instead use localtime_rz + strftime. 1316*/ 1317 1318#endif 1319 1320/* 1321** The easy way to behave "as if no library function calls" localtime 1322** is to not call it, so we drop its guts into "localsub", which can be 1323** freely called. (And no, the PANS doesn't require the above behavior, 1324** but it *is* desirable.) 1325** 1326** If OFFSET is nonzero, set tzname if successful. 1327** OFFSET's type is intfast32_t for compatibility with gmtsub. 1328*/ 1329 1330/*ARGSUSED*/ 1331static struct tm * 1332localsub(struct state const *sp, time_t const *timep, int_fast32_t offset, 1333 struct tm *const tmp) 1334{ 1335 const struct ttinfo * ttisp; 1336 int i; 1337 struct tm * result; 1338 const time_t t = *timep; 1339 1340 if (sp == NULL) { 1341 result = gmtsub(gmtptr, timep, 0, tmp); 1342 if (result && offset) 1343 tzname[0] = gmtptr ? gmtptr->chars : __UNCONST(gmt); 1344 return result; 1345 } 1346 if ((sp->goback && t < sp->ats[0]) || 1347 (sp->goahead && t > sp->ats[sp->timecnt - 1])) { 1348 time_t newt = t; 1349 time_t seconds; 1350 time_t years; 1351 1352 if (t < sp->ats[0]) 1353 seconds = sp->ats[0] - t; 1354 else seconds = t - sp->ats[sp->timecnt - 1]; 1355 --seconds; 1356 years = (time_t)((seconds / SECSPERREPEAT + 1) * YEARSPERREPEAT); 1357 seconds = (time_t)(years * AVGSECSPERYEAR); 1358 if (t < sp->ats[0]) 1359 newt += seconds; 1360 else newt -= seconds; 1361 if (newt < sp->ats[0] || 1362 newt > sp->ats[sp->timecnt - 1]) { 1363 errno = EINVAL; 1364 return NULL; /* "cannot happen" */ 1365 } 1366 result = localsub(sp, &newt, offset, tmp); 1367 if (result) { 1368 int_fast64_t newy; 1369 1370 newy = result->tm_year; 1371 if (t < sp->ats[0]) 1372 newy -= years; 1373 else newy += years; 1374 if (! (INT_MIN <= newy && newy <= INT_MAX)) { 1375 errno = EOVERFLOW; 1376 return NULL; 1377 } 1378 result->tm_year = (int)newy; 1379 } 1380 return result; 1381 } 1382 if (sp->timecnt == 0 || t < sp->ats[0]) { 1383 i = sp->defaulttype; 1384 } else { 1385 int lo = 1; 1386 int hi = sp->timecnt; 1387 1388 while (lo < hi) { 1389 int mid = (lo + hi) / 2; 1390 1391 if (t < sp->ats[mid]) 1392 hi = mid; 1393 else lo = mid + 1; 1394 } 1395 i = (int) sp->types[lo - 1]; 1396 } 1397 ttisp = &sp->ttis[i]; 1398 /* 1399 ** To get (wrong) behavior that's compatible with System V Release 2.0 1400 ** you'd replace the statement below with 1401 ** t += ttisp->tt_gmtoff; 1402 ** timesub(&t, 0L, sp, tmp); 1403 */ 1404 result = timesub(&t, ttisp->tt_gmtoff, sp, tmp); 1405 if (result) { 1406 result->tm_isdst = ttisp->tt_isdst; 1407 if (offset) 1408 tzname[result->tm_isdst] = 1409 __UNCONST(&sp->chars[ttisp->tt_abbrind]); 1410#ifdef TM_ZONE 1411 result->TM_ZONE = __UNCONST(&sp->chars[ttisp->tt_abbrind]); 1412#endif /* defined TM_ZONE */ 1413 } 1414 return result; 1415} 1416 1417#if NETBSD_INSPIRED 1418 1419struct tm * 1420localtime_rz(timezone_t sp, time_t const *timep, struct tm *tmp) 1421{ 1422 return localsub(sp, timep, 0, tmp); 1423} 1424 1425#endif 1426 1427static struct tm * 1428localtime_tzset(time_t const *timep, struct tm *tmp, bool setname) 1429{ 1430 rwlock_wrlock(&lcl_lock); 1431 if (setname || !lcl_is_set) 1432 tzset_unlocked(); 1433 tmp = localsub(lclptr, timep, setname, tmp); 1434 rwlock_unlock(&lcl_lock); 1435 if (tmp == NULL) 1436 errno = EOVERFLOW; 1437 return tmp; 1438} 1439 1440struct tm * 1441localtime(const time_t *const timep) 1442{ 1443 return localtime_tzset(timep, &tm, true); 1444} 1445 1446struct tm * 1447localtime_r(const time_t * __restrict timep, struct tm *tmp) 1448{ 1449 return localtime_tzset(timep, tmp, false); 1450} 1451 1452/* 1453** gmtsub is to gmtime as localsub is to localtime. 1454*/ 1455 1456static struct tm * 1457gmtsub(struct state const *sp, const time_t *timep, int_fast32_t offset, 1458 struct tm *tmp) 1459{ 1460 struct tm * result; 1461 1462 result = timesub(timep, offset, gmtptr, tmp); 1463#ifdef TM_ZONE 1464 /* 1465 ** Could get fancy here and deliver something such as 1466 ** "UT+xxxx" or "UT-xxxx" if offset is non-zero, 1467 ** but this is no time for a treasure hunt. 1468 */ 1469 if (result) 1470 result->TM_ZONE = offset ? __UNCONST(wildabbr) : gmtptr ? 1471 gmtptr->chars : __UNCONST(gmt); 1472#endif /* defined TM_ZONE */ 1473 return result; 1474} 1475 1476struct tm * 1477gmtime(const time_t *const timep) 1478{ 1479 return gmtime_r(timep, &tm); 1480} 1481 1482/* 1483** Re-entrant version of gmtime. 1484*/ 1485 1486struct tm * 1487gmtime_r(const time_t * const timep, struct tm *tmp) 1488{ 1489 gmtcheck(); 1490 tmp = gmtsub(NULL, timep, 0, tmp); 1491 1492 if (tmp == NULL) 1493 errno = EOVERFLOW; 1494 1495 return tmp; 1496} 1497 1498#ifdef STD_INSPIRED 1499 1500struct tm * 1501offtime(const time_t *const timep, long offset) 1502{ 1503 struct tm *tmp; 1504 1505 gmtcheck(); 1506 tmp = gmtsub(gmtptr, timep, (int_fast32_t)offset, &tm); 1507 1508 if (tmp == NULL) 1509 errno = EOVERFLOW; 1510 1511 return tmp; 1512} 1513 1514struct tm * 1515offtime_r(const time_t *timep, long offset, struct tm *tmp) 1516{ 1517 gmtcheck(); 1518 tmp = gmtsub(NULL, timep, (int_fast32_t)offset, tmp); 1519 1520 if (tmp == NULL) 1521 errno = EOVERFLOW; 1522 1523 return tmp; 1524} 1525 1526#endif /* defined STD_INSPIRED */ 1527 1528/* 1529** Return the number of leap years through the end of the given year 1530** where, to make the math easy, the answer for year zero is defined as zero. 1531*/ 1532 1533static int ATTRIBUTE_PURE 1534leaps_thru_end_of(const int y) 1535{ 1536 return (y >= 0) ? (y / 4 - y / 100 + y / 400) : 1537 -(leaps_thru_end_of(-(y + 1)) + 1); 1538} 1539 1540static struct tm * 1541timesub(time_t const *timep, int_fast32_t offset, struct state const *sp, 1542 struct tm *tmp) 1543{ 1544 const struct lsinfo * lp; 1545 time_t tdays; 1546 int idays; /* unsigned would be so 2003 */ 1547 int_fast64_t rem; 1548 int y; 1549 const int * ip; 1550 int_fast64_t corr; 1551 bool hit; 1552 int i; 1553 1554 corr = 0; 1555 hit = false; 1556 i = (sp == NULL) ? 0 : sp->leapcnt; 1557 while (--i >= 0) { 1558 lp = &sp->lsis[i]; 1559 if (*timep >= lp->ls_trans) { 1560 if (*timep == lp->ls_trans) { 1561 hit = ((i == 0 && lp->ls_corr > 0) || 1562 lp->ls_corr > sp->lsis[i - 1].ls_corr); 1563 if (hit) 1564 while (i > 0 && 1565 sp->lsis[i].ls_trans == 1566 sp->lsis[i - 1].ls_trans + 1 && 1567 sp->lsis[i].ls_corr == 1568 sp->lsis[i - 1].ls_corr + 1) { 1569 ++hit; 1570 --i; 1571 } 1572 } 1573 corr = lp->ls_corr; 1574 break; 1575 } 1576 } 1577 y = EPOCH_YEAR; 1578 tdays = (time_t)(*timep / SECSPERDAY); 1579 rem = (int_fast64_t) (*timep - tdays * SECSPERDAY); 1580 while (tdays < 0 || tdays >= year_lengths[isleap(y)]) { 1581 int newy; 1582 time_t tdelta; 1583 int idelta; 1584 int leapdays; 1585 1586 tdelta = tdays / DAYSPERLYEAR; 1587 if (! ((! TYPE_SIGNED(time_t) || INT_MIN <= tdelta) 1588 && tdelta <= INT_MAX)) 1589 goto overflow; 1590 _DIAGASSERT(__type_fit(int, tdelta)); 1591 idelta = (int)tdelta; 1592 if (idelta == 0) 1593 idelta = (tdays < 0) ? -1 : 1; 1594 newy = y; 1595 if (increment_overflow(&newy, idelta)) 1596 goto overflow; 1597 leapdays = leaps_thru_end_of(newy - 1) - 1598 leaps_thru_end_of(y - 1); 1599 tdays -= ((time_t) newy - y) * DAYSPERNYEAR; 1600 tdays -= leapdays; 1601 y = newy; 1602 } 1603 { 1604 int_fast32_t seconds; 1605 1606 seconds = (int_fast32_t)(tdays * SECSPERDAY); 1607 tdays = (time_t)(seconds / SECSPERDAY); 1608 rem += (int_fast64_t)(seconds - tdays * SECSPERDAY); 1609 } 1610 /* 1611 ** Given the range, we can now fearlessly cast... 1612 */ 1613 idays = (int) tdays; 1614 rem += offset - corr; 1615 while (rem < 0) { 1616 rem += SECSPERDAY; 1617 --idays; 1618 } 1619 while (rem >= SECSPERDAY) { 1620 rem -= SECSPERDAY; 1621 ++idays; 1622 } 1623 while (idays < 0) { 1624 if (increment_overflow(&y, -1)) 1625 goto overflow; 1626 idays += year_lengths[isleap(y)]; 1627 } 1628 while (idays >= year_lengths[isleap(y)]) { 1629 idays -= year_lengths[isleap(y)]; 1630 if (increment_overflow(&y, 1)) 1631 goto overflow; 1632 } 1633 tmp->tm_year = y; 1634 if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE)) 1635 return NULL; 1636 tmp->tm_yday = idays; 1637 /* 1638 ** The "extra" mods below avoid overflow problems. 1639 */ 1640 tmp->tm_wday = EPOCH_WDAY + 1641 ((y - EPOCH_YEAR) % DAYSPERWEEK) * 1642 (DAYSPERNYEAR % DAYSPERWEEK) + 1643 leaps_thru_end_of(y - 1) - 1644 leaps_thru_end_of(EPOCH_YEAR - 1) + 1645 idays; 1646 tmp->tm_wday %= DAYSPERWEEK; 1647 if (tmp->tm_wday < 0) 1648 tmp->tm_wday += DAYSPERWEEK; 1649 tmp->tm_hour = (int) (rem / SECSPERHOUR); 1650 rem %= SECSPERHOUR; 1651 tmp->tm_min = (int) (rem / SECSPERMIN); 1652 /* 1653 ** A positive leap second requires a special 1654 ** representation. This uses "... ??:59:60" et seq. 1655 */ 1656 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; 1657 ip = mon_lengths[isleap(y)]; 1658 for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon)) 1659 idays -= ip[tmp->tm_mon]; 1660 tmp->tm_mday = (int) (idays + 1); 1661 tmp->tm_isdst = 0; 1662#ifdef TM_GMTOFF 1663 tmp->TM_GMTOFF = offset; 1664#endif /* defined TM_GMTOFF */ 1665 return tmp; 1666overflow: 1667 errno = EOVERFLOW; 1668 return NULL; 1669} 1670 1671char * 1672ctime(const time_t *const timep) 1673{ 1674/* 1675** Section 4.12.3.2 of X3.159-1989 requires that 1676** The ctime function converts the calendar time pointed to by timer 1677** to local time in the form of a string. It is equivalent to 1678** asctime(localtime(timer)) 1679*/ 1680 struct tm *rtm = localtime(timep); 1681 if (rtm == NULL) 1682 return NULL; 1683 return asctime(rtm); 1684} 1685 1686char * 1687ctime_r(const time_t *const timep, char *buf) 1688{ 1689 struct tm mytm, *rtm; 1690 1691 rtm = localtime_r(timep, &mytm); 1692 if (rtm == NULL) 1693 return NULL; 1694 return asctime_r(rtm, buf); 1695} 1696 1697char * 1698ctime_rz(const timezone_t sp, const time_t * timep, char *buf) 1699{ 1700 struct tm mytm, *rtm; 1701 1702 rtm = localtime_rz(sp, timep, &mytm); 1703 if (rtm == NULL) 1704 return NULL; 1705 return asctime_r(rtm, buf); 1706} 1707 1708/* 1709** Adapted from code provided by Robert Elz, who writes: 1710** The "best" way to do mktime I think is based on an idea of Bob 1711** Kridle's (so its said...) from a long time ago. 1712** It does a binary search of the time_t space. Since time_t's are 1713** just 32 bits, its a max of 32 iterations (even at 64 bits it 1714** would still be very reasonable). 1715*/ 1716 1717#ifndef WRONG 1718#define WRONG ((time_t)-1) 1719#endif /* !defined WRONG */ 1720 1721/* 1722** Normalize logic courtesy Paul Eggert. 1723*/ 1724 1725static bool 1726increment_overflow(int *const ip, int j) 1727{ 1728 int const i = *ip; 1729 1730 /* 1731 ** If i >= 0 there can only be overflow if i + j > INT_MAX 1732 ** or if j > INT_MAX - i; given i >= 0, INT_MAX - i cannot overflow. 1733 ** If i < 0 there can only be overflow if i + j < INT_MIN 1734 ** or if j < INT_MIN - i; given i < 0, INT_MIN - i cannot overflow. 1735 */ 1736 if ((i >= 0) ? (j > INT_MAX - i) : (j < INT_MIN - i)) 1737 return true; 1738 *ip += j; 1739 return false; 1740} 1741 1742static bool 1743increment_overflow32(int_fast32_t *const lp, int const m) 1744{ 1745 int_fast32_t const l = *lp; 1746 1747 if ((l >= 0) ? (m > INT_FAST32_MAX - l) : (m < INT_FAST32_MIN - l)) 1748 return true; 1749 *lp += m; 1750 return false; 1751} 1752 1753static bool 1754increment_overflow_time(time_t *tp, int_fast32_t j) 1755{ 1756 /* 1757 ** This is like 1758 ** 'if (! (time_t_min <= *tp + j && *tp + j <= time_t_max)) ...', 1759 ** except that it does the right thing even if *tp + j would overflow. 1760 */ 1761 if (! (j < 0 1762 ? (TYPE_SIGNED(time_t) ? time_t_min - j <= *tp : -1 - j < *tp) 1763 : *tp <= time_t_max - j)) 1764 return true; 1765 *tp += j; 1766 return false; 1767} 1768 1769static bool 1770normalize_overflow(int *const tensptr, int *const unitsptr, const int base) 1771{ 1772 int tensdelta; 1773 1774 tensdelta = (*unitsptr >= 0) ? 1775 (*unitsptr / base) : 1776 (-1 - (-1 - *unitsptr) / base); 1777 *unitsptr -= tensdelta * base; 1778 return increment_overflow(tensptr, tensdelta); 1779} 1780 1781static bool 1782normalize_overflow32(int_fast32_t *const tensptr, int *const unitsptr, 1783 const int base) 1784{ 1785 int tensdelta; 1786 1787 tensdelta = (*unitsptr >= 0) ? 1788 (*unitsptr / base) : 1789 (-1 - (-1 - *unitsptr) / base); 1790 *unitsptr -= tensdelta * base; 1791 return increment_overflow32(tensptr, tensdelta); 1792} 1793 1794static int 1795tmcomp(const struct tm *const atmp, 1796 const struct tm *const btmp) 1797{ 1798 int result; 1799 1800 if (atmp->tm_year != btmp->tm_year) 1801 return atmp->tm_year < btmp->tm_year ? -1 : 1; 1802 if ((result = (atmp->tm_mon - btmp->tm_mon)) == 0 && 1803 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && 1804 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && 1805 (result = (atmp->tm_min - btmp->tm_min)) == 0) 1806 result = atmp->tm_sec - btmp->tm_sec; 1807 return result; 1808} 1809 1810static time_t 1811time2sub(struct tm *const tmp, 1812 struct tm *(*funcp)(struct state const *, time_t const *, 1813 int_fast32_t, struct tm *), 1814 struct state const *sp, 1815 const int_fast32_t offset, 1816 bool *okayp, 1817 bool do_norm_secs) 1818{ 1819 int dir; 1820 int i, j; 1821 int saved_seconds; 1822 int_fast32_t li; 1823 time_t lo; 1824 time_t hi; 1825#ifdef NO_ERROR_IN_DST_GAP 1826 time_t ilo; 1827#endif 1828 int_fast32_t y; 1829 time_t newt; 1830 time_t t; 1831 struct tm yourtm, mytm; 1832 1833 *okayp = false; 1834 yourtm = *tmp; 1835#ifdef NO_ERROR_IN_DST_GAP 1836again: 1837#endif 1838 if (do_norm_secs) { 1839 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec, 1840 SECSPERMIN)) 1841 goto overflow; 1842 } 1843 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) 1844 goto overflow; 1845 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) 1846 goto overflow; 1847 y = yourtm.tm_year; 1848 if (normalize_overflow32(&y, &yourtm.tm_mon, MONSPERYEAR)) 1849 goto overflow; 1850 /* 1851 ** Turn y into an actual year number for now. 1852 ** It is converted back to an offset from TM_YEAR_BASE later. 1853 */ 1854 if (increment_overflow32(&y, TM_YEAR_BASE)) 1855 goto overflow; 1856 while (yourtm.tm_mday <= 0) { 1857 if (increment_overflow32(&y, -1)) 1858 goto overflow; 1859 li = y + (1 < yourtm.tm_mon); 1860 yourtm.tm_mday += year_lengths[isleap(li)]; 1861 } 1862 while (yourtm.tm_mday > DAYSPERLYEAR) { 1863 li = y + (1 < yourtm.tm_mon); 1864 yourtm.tm_mday -= year_lengths[isleap(li)]; 1865 if (increment_overflow32(&y, 1)) 1866 goto overflow; 1867 } 1868 for ( ; ; ) { 1869 i = mon_lengths[isleap(y)][yourtm.tm_mon]; 1870 if (yourtm.tm_mday <= i) 1871 break; 1872 yourtm.tm_mday -= i; 1873 if (++yourtm.tm_mon >= MONSPERYEAR) { 1874 yourtm.tm_mon = 0; 1875 if (increment_overflow32(&y, 1)) 1876 goto overflow; 1877 } 1878 } 1879 if (increment_overflow32(&y, -TM_YEAR_BASE)) 1880 goto overflow; 1881 if (! (INT_MIN <= y && y <= INT_MAX)) 1882 goto overflow; 1883 yourtm.tm_year = (int)y; 1884 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN) 1885 saved_seconds = 0; 1886 else if (y + TM_YEAR_BASE < EPOCH_YEAR) { 1887 /* 1888 ** We can't set tm_sec to 0, because that might push the 1889 ** time below the minimum representable time. 1890 ** Set tm_sec to 59 instead. 1891 ** This assumes that the minimum representable time is 1892 ** not in the same minute that a leap second was deleted from, 1893 ** which is a safer assumption than using 58 would be. 1894 */ 1895 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) 1896 goto overflow; 1897 saved_seconds = yourtm.tm_sec; 1898 yourtm.tm_sec = SECSPERMIN - 1; 1899 } else { 1900 saved_seconds = yourtm.tm_sec; 1901 yourtm.tm_sec = 0; 1902 } 1903 /* 1904 ** Do a binary search (this works whatever time_t's type is). 1905 */ 1906 /* LINTED const not */ 1907 if (!TYPE_SIGNED(time_t)) { 1908 lo = 0; 1909 hi = lo - 1; 1910 } else { 1911 lo = 1; 1912 for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i) 1913 lo *= 2; 1914 hi = -(lo + 1); 1915 } 1916#ifdef NO_ERROR_IN_DST_GAP 1917 ilo = lo; 1918#endif 1919 for ( ; ; ) { 1920 t = lo / 2 + hi / 2; 1921 if (t < lo) 1922 t = lo; 1923 else if (t > hi) 1924 t = hi; 1925 if (! funcp(sp, &t, offset, &mytm)) { 1926 /* 1927 ** Assume that t is too extreme to be represented in 1928 ** a struct tm; arrange things so that it is less 1929 ** extreme on the next pass. 1930 */ 1931 dir = (t > 0) ? 1 : -1; 1932 } else dir = tmcomp(&mytm, &yourtm); 1933 if (dir != 0) { 1934 if (t == lo) { 1935 if (t == time_t_max) 1936 goto overflow; 1937 ++t; 1938 ++lo; 1939 } else if (t == hi) { 1940 if (t == time_t_min) 1941 goto overflow; 1942 --t; 1943 --hi; 1944 } 1945#ifdef NO_ERROR_IN_DST_GAP 1946 if (ilo != lo && lo - 1 == hi && yourtm.tm_isdst < 0 && 1947 do_norm_secs) { 1948 for (i = sp->typecnt - 1; i >= 0; --i) { 1949 for (j = sp->typecnt - 1; j >= 0; --j) { 1950 time_t off; 1951 if (sp->ttis[j].tt_isdst == 1952 sp->ttis[i].tt_isdst) 1953 continue; 1954 off = sp->ttis[j].tt_gmtoff - 1955 sp->ttis[i].tt_gmtoff; 1956 yourtm.tm_sec += off < 0 ? 1957 -off : off; 1958 goto again; 1959 } 1960 } 1961 } 1962#endif 1963 if (lo > hi) 1964 goto invalid; 1965 if (dir > 0) 1966 hi = t; 1967 else lo = t; 1968 continue; 1969 } 1970#if defined TM_GMTOFF && ! UNINIT_TRAP 1971 if (mytm.TM_GMTOFF != yourtm.TM_GMTOFF 1972 && (yourtm.TM_GMTOFF < 0 1973 ? (-SECSPERDAY <= yourtm.TM_GMTOFF 1974 && (mytm.TM_GMTOFF <= 1975 (/*CONSTCOND*/SMALLEST (INT_FAST32_MAX, LONG_MAX) 1976 + yourtm.TM_GMTOFF))) 1977 : (yourtm.TM_GMTOFF <= SECSPERDAY 1978 && ((/*CONSTCOND*/BIGGEST (INT_FAST32_MIN, LONG_MIN) 1979 + yourtm.TM_GMTOFF) 1980 <= mytm.TM_GMTOFF)))) { 1981 /* MYTM matches YOURTM except with the wrong UTC offset. 1982 YOURTM.TM_GMTOFF is plausible, so try it instead. 1983 It's OK if YOURTM.TM_GMTOFF contains uninitialized data, 1984 since the guess gets checked. */ 1985 time_t altt = t; 1986 int_fast32_t diff = (int_fast32_t) 1987 (mytm.TM_GMTOFF - yourtm.TM_GMTOFF); 1988 if (!increment_overflow_time(&altt, diff)) { 1989 struct tm alttm; 1990 if (! funcp(sp, &altt, offset, &alttm) 1991 && alttm.tm_isdst == mytm.tm_isdst 1992 && alttm.TM_GMTOFF == yourtm.TM_GMTOFF 1993 && tmcomp(&alttm, &yourtm)) { 1994 t = altt; 1995 mytm = alttm; 1996 } 1997 } 1998 } 1999#endif 2000 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) 2001 break; 2002 /* 2003 ** Right time, wrong type. 2004 ** Hunt for right time, right type. 2005 ** It's okay to guess wrong since the guess 2006 ** gets checked. 2007 */ 2008 if (sp == NULL) 2009 goto invalid; 2010 for (i = sp->typecnt - 1; i >= 0; --i) { 2011 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) 2012 continue; 2013 for (j = sp->typecnt - 1; j >= 0; --j) { 2014 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) 2015 continue; 2016 newt = (time_t)(t + sp->ttis[j].tt_gmtoff - 2017 sp->ttis[i].tt_gmtoff); 2018 if (! funcp(sp, &newt, offset, &mytm)) 2019 continue; 2020 if (tmcomp(&mytm, &yourtm) != 0) 2021 continue; 2022 if (mytm.tm_isdst != yourtm.tm_isdst) 2023 continue; 2024 /* 2025 ** We have a match. 2026 */ 2027 t = newt; 2028 goto label; 2029 } 2030 } 2031 goto invalid; 2032 } 2033label: 2034 newt = t + saved_seconds; 2035 if ((newt < t) != (saved_seconds < 0)) 2036 goto overflow; 2037 t = newt; 2038 if (funcp(sp, &t, offset, tmp)) { 2039 *okayp = true; 2040 return t; 2041 } 2042overflow: 2043 errno = EOVERFLOW; 2044 return WRONG; 2045invalid: 2046 errno = EINVAL; 2047 return WRONG; 2048} 2049 2050static time_t 2051time2(struct tm * const tmp, 2052 struct tm *(*funcp)(struct state const *, time_t const *, 2053 int_fast32_t, struct tm *), 2054 struct state const *sp, 2055 const int_fast32_t offset, 2056 bool *okayp) 2057{ 2058 time_t t; 2059 2060 /* 2061 ** First try without normalization of seconds 2062 ** (in case tm_sec contains a value associated with a leap second). 2063 ** If that fails, try with normalization of seconds. 2064 */ 2065 t = time2sub(tmp, funcp, sp, offset, okayp, false); 2066 return *okayp ? t : time2sub(tmp, funcp, sp, offset, okayp, true); 2067} 2068 2069static time_t 2070time1(struct tm *const tmp, 2071 struct tm *(*funcp) (struct state const *, time_t const *, 2072 int_fast32_t, struct tm *), 2073 struct state const *sp, 2074 const int_fast32_t offset) 2075{ 2076 time_t t; 2077 int samei, otheri; 2078 int sameind, otherind; 2079 int i; 2080 int nseen; 2081 char seen[TZ_MAX_TYPES]; 2082 unsigned char types[TZ_MAX_TYPES]; 2083 bool okay; 2084 2085 if (tmp == NULL) { 2086 errno = EINVAL; 2087 return WRONG; 2088 } 2089 if (tmp->tm_isdst > 1) 2090 tmp->tm_isdst = 1; 2091 t = time2(tmp, funcp, sp, offset, &okay); 2092 if (okay) 2093 return t; 2094 if (tmp->tm_isdst < 0) 2095#ifdef PCTS 2096 /* 2097 ** POSIX Conformance Test Suite code courtesy Grant Sullivan. 2098 */ 2099 tmp->tm_isdst = 0; /* reset to std and try again */ 2100#else 2101 return t; 2102#endif /* !defined PCTS */ 2103 /* 2104 ** We're supposed to assume that somebody took a time of one type 2105 ** and did some math on it that yielded a "struct tm" that's bad. 2106 ** We try to divine the type they started from and adjust to the 2107 ** type they need. 2108 */ 2109 if (sp == NULL) { 2110 errno = EINVAL; 2111 return WRONG; 2112 } 2113 for (i = 0; i < sp->typecnt; ++i) 2114 seen[i] = false; 2115 nseen = 0; 2116 for (i = sp->timecnt - 1; i >= 0; --i) 2117 if (!seen[sp->types[i]]) { 2118 seen[sp->types[i]] = true; 2119 types[nseen++] = sp->types[i]; 2120 } 2121 for (sameind = 0; sameind < nseen; ++sameind) { 2122 samei = types[sameind]; 2123 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) 2124 continue; 2125 for (otherind = 0; otherind < nseen; ++otherind) { 2126 otheri = types[otherind]; 2127 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) 2128 continue; 2129 tmp->tm_sec += (int)(sp->ttis[otheri].tt_gmtoff - 2130 sp->ttis[samei].tt_gmtoff); 2131 tmp->tm_isdst = !tmp->tm_isdst; 2132 t = time2(tmp, funcp, sp, offset, &okay); 2133 if (okay) 2134 return t; 2135 tmp->tm_sec -= (int)(sp->ttis[otheri].tt_gmtoff - 2136 sp->ttis[samei].tt_gmtoff); 2137 tmp->tm_isdst = !tmp->tm_isdst; 2138 } 2139 } 2140 errno = EOVERFLOW; 2141 return WRONG; 2142} 2143 2144static time_t 2145mktime_tzname(timezone_t sp, struct tm *tmp, bool setname) 2146{ 2147 if (sp) 2148 return time1(tmp, localsub, sp, setname); 2149 else { 2150 gmtcheck(); 2151 return time1(tmp, gmtsub, gmtptr, 0); 2152 } 2153} 2154 2155#if NETBSD_INSPIRED 2156 2157time_t 2158mktime_z(timezone_t sp, struct tm *const tmp) 2159{ 2160 return mktime_tzname(sp, tmp, false); 2161} 2162 2163#endif 2164 2165time_t 2166mktime(struct tm *const tmp) 2167{ 2168 time_t t; 2169 2170 rwlock_wrlock(&lcl_lock); 2171 tzset_unlocked(); 2172 t = mktime_tzname(lclptr, tmp, true); 2173 rwlock_unlock(&lcl_lock); 2174 return t; 2175} 2176 2177#ifdef STD_INSPIRED 2178 2179time_t 2180timelocal_z(const timezone_t sp, struct tm *const tmp) 2181{ 2182 if (tmp != NULL) 2183 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 2184 return mktime_z(sp, tmp); 2185} 2186 2187time_t 2188timelocal(struct tm *const tmp) 2189{ 2190 if (tmp != NULL) 2191 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 2192 return mktime(tmp); 2193} 2194 2195time_t 2196timegm(struct tm *const tmp) 2197{ 2198 2199 return timeoff(tmp, 0); 2200} 2201 2202time_t 2203timeoff(struct tm *const tmp, long offset) 2204{ 2205 if (tmp) 2206 tmp->tm_isdst = 0; 2207 gmtcheck(); 2208 return time1(tmp, gmtsub, gmtptr, (int_fast32_t)offset); 2209} 2210 2211#endif /* defined STD_INSPIRED */ 2212 2213/* 2214** XXX--is the below the right way to conditionalize?? 2215*/ 2216 2217#ifdef STD_INSPIRED 2218 2219/* 2220** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 2221** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which 2222** is not the case if we are accounting for leap seconds. 2223** So, we provide the following conversion routines for use 2224** when exchanging timestamps with POSIX conforming systems. 2225*/ 2226 2227static int_fast64_t 2228leapcorr(const timezone_t sp, time_t t) 2229{ 2230 struct lsinfo const * lp; 2231 int i; 2232 2233 i = sp->leapcnt; 2234 while (--i >= 0) { 2235 lp = &sp->lsis[i]; 2236 if (t >= lp->ls_trans) 2237 return lp->ls_corr; 2238 } 2239 return 0; 2240} 2241 2242NETBSD_INSPIRED_EXTERN time_t ATTRIBUTE_PURE 2243time2posix_z(timezone_t sp, time_t t) 2244{ 2245 return (time_t)(t - leapcorr(sp, t)); 2246} 2247 2248time_t 2249time2posix(time_t t) 2250{ 2251 rwlock_wrlock(&lcl_lock); 2252 if (!lcl_is_set) 2253 tzset_unlocked(); 2254 if (lclptr) 2255 t = (time_t)(t - leapcorr(lclptr, t)); 2256 rwlock_unlock(&lcl_lock); 2257 return t; 2258} 2259 2260NETBSD_INSPIRED_EXTERN time_t ATTRIBUTE_PURE 2261posix2time_z(timezone_t sp, time_t t) 2262{ 2263 time_t x; 2264 time_t y; 2265 2266 /* 2267 ** For a positive leap second hit, the result 2268 ** is not unique. For a negative leap second 2269 ** hit, the corresponding time doesn't exist, 2270 ** so we return an adjacent second. 2271 */ 2272 x = (time_t)(t + leapcorr(sp, t)); 2273 y = (time_t)(x - leapcorr(sp, x)); 2274 if (y < t) { 2275 do { 2276 x++; 2277 y = (time_t)(x - leapcorr(sp, x)); 2278 } while (y < t); 2279 x -= y != t; 2280 } else if (y > t) { 2281 do { 2282 --x; 2283 y = (time_t)(x - leapcorr(sp, x)); 2284 } while (y > t); 2285 x += y != t; 2286 } 2287 return x; 2288} 2289 2290time_t 2291posix2time(time_t t) 2292{ 2293 rwlock_wrlock(&lcl_lock); 2294 if (!lcl_is_set) 2295 tzset_unlocked(); 2296 if (lclptr) 2297 t = posix2time_z(lclptr, t); 2298 rwlock_unlock(&lcl_lock); 2299 return t; 2300} 2301 2302#endif /* defined STD_INSPIRED */ 2303