localtime.c revision 194783
1/* 2** This file is in the public domain, so clarified as of 3** 1996-06-05 by Arthur David Olson. 4*/ 5 6#include <sys/cdefs.h> 7#ifndef lint 8#ifndef NOID 9static char elsieid[] __unused = "@(#)localtime.c 8.9"; 10#endif /* !defined NOID */ 11#endif /* !defined lint */ 12__FBSDID("$FreeBSD: head/lib/libc/stdtime/localtime.c 194783 2009-06-23 22:28:44Z edwin $"); 13 14/* 15** Leap second handling from Bradley White. 16** POSIX-style TZ environment variable handling from Guy Harris. 17*/ 18 19/*LINTLIBRARY*/ 20 21#include "namespace.h" 22#include <sys/types.h> 23#include <sys/stat.h> 24#include <fcntl.h> 25#include <pthread.h> 26#include "private.h" 27#include "un-namespace.h" 28 29#include "tzfile.h" 30#include "float.h" /* for FLT_MAX and DBL_MAX */ 31 32#ifndef TZ_ABBR_MAX_LEN 33#define TZ_ABBR_MAX_LEN 16 34#endif /* !defined TZ_ABBR_MAX_LEN */ 35 36#ifndef TZ_ABBR_CHAR_SET 37#define TZ_ABBR_CHAR_SET \ 38 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._" 39#endif /* !defined TZ_ABBR_CHAR_SET */ 40 41#ifndef TZ_ABBR_ERR_CHAR 42#define TZ_ABBR_ERR_CHAR '_' 43#endif /* !defined TZ_ABBR_ERR_CHAR */ 44 45#include "libc_private.h" 46 47#define _MUTEX_LOCK(x) if (__isthreaded) _pthread_mutex_lock(x) 48#define _MUTEX_UNLOCK(x) if (__isthreaded) _pthread_mutex_unlock(x) 49 50#define _RWLOCK_RDLOCK(x) \ 51 do { \ 52 if (__isthreaded) _pthread_rwlock_rdlock(x); \ 53 } while (0) 54 55#define _RWLOCK_WRLOCK(x) \ 56 do { \ 57 if (__isthreaded) _pthread_rwlock_wrlock(x); \ 58 } while (0) 59 60#define _RWLOCK_UNLOCK(x) \ 61 do { \ 62 if (__isthreaded) _pthread_rwlock_unlock(x); \ 63 } while (0) 64 65/* 66** SunOS 4.1.1 headers lack O_BINARY. 67*/ 68 69#ifdef O_BINARY 70#define OPEN_MODE (O_RDONLY | O_BINARY) 71#endif /* defined O_BINARY */ 72#ifndef O_BINARY 73#define OPEN_MODE O_RDONLY 74#endif /* !defined O_BINARY */ 75 76#ifndef WILDABBR 77/* 78** Someone might make incorrect use of a time zone abbreviation: 79** 1. They might reference tzname[0] before calling tzset (explicitly 80** or implicitly). 81** 2. They might reference tzname[1] before calling tzset (explicitly 82** or implicitly). 83** 3. They might reference tzname[1] after setting to a time zone 84** in which Daylight Saving Time is never observed. 85** 4. They might reference tzname[0] after setting to a time zone 86** in which Standard Time is never observed. 87** 5. They might reference tm.TM_ZONE after calling offtime. 88** What's best to do in the above cases is open to debate; 89** for now, we just set things up so that in any of the five cases 90** WILDABBR is used. Another possibility: initialize tzname[0] to the 91** string "tzname[0] used before set", and similarly for the other cases. 92** And another: initialize tzname[0] to "ERA", with an explanation in the 93** manual page of what this "time zone abbreviation" means (doing this so 94** that tzname[0] has the "normal" length of three characters). 95*/ 96#define WILDABBR " " 97#endif /* !defined WILDABBR */ 98 99static char wildabbr[] = WILDABBR; 100 101/* 102 * In June 2004 it was decided UTC was a more appropriate default time 103 * zone than GMT. 104 */ 105 106static const char gmt[] = "UTC"; 107 108/* 109** The DST rules to use if TZ has no rules and we can't load TZDEFRULES. 110** We default to US rules as of 1999-08-17. 111** POSIX 1003.1 section 8.1.1 says that the default DST rules are 112** implementation dependent; for historical reasons, US rules are a 113** common default. 114*/ 115#ifndef TZDEFRULESTRING 116#define TZDEFRULESTRING ",M4.1.0,M10.5.0" 117#endif /* !defined TZDEFDST */ 118 119struct ttinfo { /* time type information */ 120 long tt_gmtoff; /* UTC offset in seconds */ 121 int tt_isdst; /* used to set tm_isdst */ 122 int tt_abbrind; /* abbreviation list index */ 123 int tt_ttisstd; /* TRUE if transition is std time */ 124 int tt_ttisgmt; /* TRUE if transition is UTC */ 125}; 126 127struct lsinfo { /* leap second information */ 128 time_t ls_trans; /* transition time */ 129 long ls_corr; /* correction to apply */ 130}; 131 132#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) 133 134#ifdef TZNAME_MAX 135#define MY_TZNAME_MAX TZNAME_MAX 136#endif /* defined TZNAME_MAX */ 137#ifndef TZNAME_MAX 138#define MY_TZNAME_MAX 255 139#endif /* !defined TZNAME_MAX */ 140 141struct state { 142 int leapcnt; 143 int timecnt; 144 int typecnt; 145 int charcnt; 146 int goback; 147 int goahead; 148 time_t ats[TZ_MAX_TIMES]; 149 unsigned char types[TZ_MAX_TIMES]; 150 struct ttinfo ttis[TZ_MAX_TYPES]; 151 char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt), 152 (2 * (MY_TZNAME_MAX + 1)))]; 153 struct lsinfo lsis[TZ_MAX_LEAPS]; 154}; 155 156struct rule { 157 int r_type; /* type of rule--see below */ 158 int r_day; /* day number of rule */ 159 int r_week; /* week number of rule */ 160 int r_mon; /* month number of rule */ 161 long r_time; /* transition time of rule */ 162}; 163 164#define JULIAN_DAY 0 /* Jn - Julian day */ 165#define DAY_OF_YEAR 1 /* n - day of year */ 166#define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */ 167 168/* 169** Prototypes for static functions. 170*/ 171 172static long detzcode(const char * codep); 173static time_t detzcode64(const char * codep); 174static int differ_by_repeat(time_t t1, time_t t0); 175static const char * getzname(const char * strp); 176static const char * getqzname(const char * strp, const int delim); 177static const char * getnum(const char * strp, int * nump, int min, 178 int max); 179static const char * getsecs(const char * strp, long * secsp); 180static const char * getoffset(const char * strp, long * offsetp); 181static const char * getrule(const char * strp, struct rule * rulep); 182static void gmtload(struct state * sp); 183static struct tm * gmtsub(const time_t * timep, long offset, 184 struct tm * tmp); 185static struct tm * localsub(const time_t * timep, long offset, 186 struct tm * tmp); 187static int increment_overflow(int * number, int delta); 188static int leaps_thru_end_of(int y); 189static int long_increment_overflow(long * number, int delta); 190static int long_normalize_overflow(long * tensptr, 191 int * unitsptr, int base); 192static int normalize_overflow(int * tensptr, int * unitsptr, 193 int base); 194static void settzname(void); 195static time_t time1(struct tm * tmp, 196 struct tm * (*funcp)(const time_t *, 197 long, struct tm *), 198 long offset); 199static time_t time2(struct tm *tmp, 200 struct tm * (*funcp)(const time_t *, 201 long, struct tm*), 202 long offset, int * okayp); 203static time_t time2sub(struct tm *tmp, 204 struct tm * (*funcp)(const time_t *, 205 long, struct tm*), 206 long offset, int * okayp, int do_norm_secs); 207static struct tm * timesub(const time_t * timep, long offset, 208 const struct state * sp, struct tm * tmp); 209static int tmcomp(const struct tm * atmp, 210 const struct tm * btmp); 211static time_t transtime(time_t janfirst, int year, 212 const struct rule * rulep, long offset); 213static int typesequiv(const struct state * sp, int a, int b); 214static int tzload(const char * name, struct state * sp, 215 int doextend); 216static int tzparse(const char * name, struct state * sp, 217 int lastditch); 218 219#ifdef ALL_STATE 220static struct state * lclptr; 221static struct state * gmtptr; 222#endif /* defined ALL_STATE */ 223 224#ifndef ALL_STATE 225static struct state lclmem; 226static struct state gmtmem; 227#define lclptr (&lclmem) 228#define gmtptr (&gmtmem) 229#endif /* State Farm */ 230 231#ifndef TZ_STRLEN_MAX 232#define TZ_STRLEN_MAX 255 233#endif /* !defined TZ_STRLEN_MAX */ 234 235static char lcl_TZname[TZ_STRLEN_MAX + 1]; 236static int lcl_is_set; 237static int gmt_is_set; 238static pthread_rwlock_t lcl_rwlock = PTHREAD_RWLOCK_INITIALIZER; 239static pthread_mutex_t gmt_mutex = PTHREAD_MUTEX_INITIALIZER; 240 241char * tzname[2] = { 242 wildabbr, 243 wildabbr 244}; 245 246/* 247** Section 4.12.3 of X3.159-1989 requires that 248** Except for the strftime function, these functions [asctime, 249** ctime, gmtime, localtime] return values in one of two static 250** objects: a broken-down time structure and an array of char. 251** Thanks to Paul Eggert for noting this. 252*/ 253 254static struct tm tm; 255 256#ifdef USG_COMPAT 257time_t timezone = 0; 258int daylight = 0; 259#endif /* defined USG_COMPAT */ 260 261#ifdef ALTZONE 262time_t altzone = 0; 263#endif /* defined ALTZONE */ 264 265static long 266detzcode(codep) 267const char * const codep; 268{ 269 long result; 270 int i; 271 272 result = (codep[0] & 0x80) ? ~0L : 0; 273 for (i = 0; i < 4; ++i) 274 result = (result << 8) | (codep[i] & 0xff); 275 return result; 276} 277 278static time_t 279detzcode64(codep) 280const char * const codep; 281{ 282 register time_t result; 283 register int i; 284 285 result = (codep[0] & 0x80) ? (~(int_fast64_t) 0) : 0; 286 for (i = 0; i < 8; ++i) 287 result = result * 256 + (codep[i] & 0xff); 288 return result; 289} 290 291static void 292settzname(void) 293{ 294 struct state * sp = lclptr; 295 int i; 296 297 tzname[0] = wildabbr; 298 tzname[1] = wildabbr; 299#ifdef USG_COMPAT 300 daylight = 0; 301 timezone = 0; 302#endif /* defined USG_COMPAT */ 303#ifdef ALTZONE 304 altzone = 0; 305#endif /* defined ALTZONE */ 306#ifdef ALL_STATE 307 if (sp == NULL) { 308 tzname[0] = tzname[1] = gmt; 309 return; 310 } 311#endif /* defined ALL_STATE */ 312 for (i = 0; i < sp->typecnt; ++i) { 313 const struct ttinfo * const ttisp = &sp->ttis[i]; 314 315 tzname[ttisp->tt_isdst] = 316 &sp->chars[ttisp->tt_abbrind]; 317#ifdef USG_COMPAT 318 if (ttisp->tt_isdst) 319 daylight = 1; 320 if (i == 0 || !ttisp->tt_isdst) 321 timezone = -(ttisp->tt_gmtoff); 322#endif /* defined USG_COMPAT */ 323#ifdef ALTZONE 324 if (i == 0 || ttisp->tt_isdst) 325 altzone = -(ttisp->tt_gmtoff); 326#endif /* defined ALTZONE */ 327 } 328 /* 329 ** And to get the latest zone names into tzname. . . 330 */ 331 for (i = 0; i < sp->timecnt; ++i) { 332 const struct ttinfo * const ttisp = 333 &sp->ttis[ 334 sp->types[i]]; 335 336 tzname[ttisp->tt_isdst] = 337 &sp->chars[ttisp->tt_abbrind]; 338 } 339 /* 340 ** Finally, scrub the abbreviations. 341 ** First, replace bogus characters. 342 */ 343 for (i = 0; i < sp->charcnt; ++i) 344 if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL) 345 sp->chars[i] = TZ_ABBR_ERR_CHAR; 346 /* 347 ** Second, truncate long abbreviations. 348 */ 349 for (i = 0; i < sp->typecnt; ++i) { 350 register const struct ttinfo * const ttisp = &sp->ttis[i]; 351 register char * cp = &sp->chars[ttisp->tt_abbrind]; 352 353 if (strlen(cp) > TZ_ABBR_MAX_LEN && 354 strcmp(cp, GRANDPARENTED) != 0) 355 *(cp + TZ_ABBR_MAX_LEN) = '\0'; 356 } 357} 358 359static int 360differ_by_repeat(t1, t0) 361const time_t t1; 362const time_t t0; 363{ 364 int_fast64_t _t0 = t0; 365 int_fast64_t _t1 = t1; 366 367 if (TYPE_INTEGRAL(time_t) && 368 TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS) 369 return 0; 370 //turn ((int_fast64_t)(t1 - t0) == SECSPERREPEAT); 371 return _t1 - _t0 == SECSPERREPEAT; 372} 373 374static int 375tzload(name, sp, doextend) 376const char * name; 377struct state * const sp; 378register const int doextend; 379{ 380 const char * p; 381 int i; 382 int fid; 383 int stored; 384 int nread; 385 union { 386 struct tzhead tzhead; 387 char buf[2 * sizeof(struct tzhead) + 388 2 * sizeof *sp + 389 4 * TZ_MAX_TIMES]; 390 } u; 391 392 /* XXX The following is from OpenBSD, and I'm not sure it is correct */ 393 if (name != NULL && issetugid() != 0) 394 if ((name[0] == ':' && name[1] == '/') || 395 name[0] == '/' || strchr(name, '.')) 396 name = NULL; 397 if (name == NULL && (name = TZDEFAULT) == NULL) 398 return -1; 399 { 400 int doaccess; 401 struct stat stab; 402 /* 403 ** Section 4.9.1 of the C standard says that 404 ** "FILENAME_MAX expands to an integral constant expression 405 ** that is the size needed for an array of char large enough 406 ** to hold the longest file name string that the implementation 407 ** guarantees can be opened." 408 */ 409 char fullname[FILENAME_MAX + 1]; 410 411 if (name[0] == ':') 412 ++name; 413 doaccess = name[0] == '/'; 414 if (!doaccess) { 415 if ((p = TZDIR) == NULL) 416 return -1; 417 if ((strlen(p) + 1 + strlen(name) + 1) >= sizeof fullname) 418 return -1; 419 (void) strcpy(fullname, p); 420 (void) strcat(fullname, "/"); 421 (void) strcat(fullname, name); 422 /* 423 ** Set doaccess if '.' (as in "../") shows up in name. 424 */ 425 if (strchr(name, '.') != NULL) 426 doaccess = TRUE; 427 name = fullname; 428 } 429 if (doaccess && access(name, R_OK) != 0) 430 return -1; 431 if ((fid = _open(name, OPEN_MODE)) == -1) 432 return -1; 433 if ((_fstat(fid, &stab) < 0) || !S_ISREG(stab.st_mode)) { 434 _close(fid); 435 return -1; 436 } 437 } 438 nread = _read(fid, u.buf, sizeof u.buf); 439 if (_close(fid) < 0 || nread <= 0) 440 return -1; 441 for (stored = 4; stored <= 8; stored *= 2) { 442 int ttisstdcnt; 443 int ttisgmtcnt; 444 445 ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt); 446 ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt); 447 sp->leapcnt = (int) detzcode(u.tzhead.tzh_leapcnt); 448 sp->timecnt = (int) detzcode(u.tzhead.tzh_timecnt); 449 sp->typecnt = (int) detzcode(u.tzhead.tzh_typecnt); 450 sp->charcnt = (int) detzcode(u.tzhead.tzh_charcnt); 451 p = u.tzhead.tzh_charcnt + sizeof u.tzhead.tzh_charcnt; 452 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || 453 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || 454 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || 455 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS || 456 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) || 457 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0)) 458 return -1; 459 if (nread - (p - u.buf) < 460 sp->timecnt * stored + /* ats */ 461 sp->timecnt + /* types */ 462 sp->typecnt * 6 + /* ttinfos */ 463 sp->charcnt + /* chars */ 464 sp->leapcnt * (stored + 4) + /* lsinfos */ 465 ttisstdcnt + /* ttisstds */ 466 ttisgmtcnt) /* ttisgmts */ 467 return -1; 468 for (i = 0; i < sp->timecnt; ++i) { 469 sp->ats[i] = (stored == 4) ? 470 detzcode(p) : detzcode64(p); 471 p += stored; 472 } 473 for (i = 0; i < sp->timecnt; ++i) { 474 sp->types[i] = (unsigned char) *p++; 475 if (sp->types[i] >= sp->typecnt) 476 return -1; 477 } 478 for (i = 0; i < sp->typecnt; ++i) { 479 struct ttinfo * ttisp; 480 481 ttisp = &sp->ttis[i]; 482 ttisp->tt_gmtoff = detzcode(p); 483 p += 4; 484 ttisp->tt_isdst = (unsigned char) *p++; 485 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) 486 return -1; 487 ttisp->tt_abbrind = (unsigned char) *p++; 488 if (ttisp->tt_abbrind < 0 || 489 ttisp->tt_abbrind > sp->charcnt) 490 return -1; 491 } 492 for (i = 0; i < sp->charcnt; ++i) 493 sp->chars[i] = *p++; 494 sp->chars[i] = '\0'; /* ensure '\0' at end */ 495 for (i = 0; i < sp->leapcnt; ++i) { 496 struct lsinfo * lsisp; 497 498 lsisp = &sp->lsis[i]; 499 lsisp->ls_trans = (stored == 4) ? 500 detzcode(p) : detzcode64(p); 501 p += stored; 502 lsisp->ls_corr = detzcode(p); 503 p += 4; 504 } 505 for (i = 0; i < sp->typecnt; ++i) { 506 struct ttinfo * ttisp; 507 508 ttisp = &sp->ttis[i]; 509 if (ttisstdcnt == 0) 510 ttisp->tt_ttisstd = FALSE; 511 else { 512 ttisp->tt_ttisstd = *p++; 513 if (ttisp->tt_ttisstd != TRUE && 514 ttisp->tt_ttisstd != FALSE) 515 return -1; 516 } 517 } 518 for (i = 0; i < sp->typecnt; ++i) { 519 struct ttinfo * ttisp; 520 521 ttisp = &sp->ttis[i]; 522 if (ttisgmtcnt == 0) 523 ttisp->tt_ttisgmt = FALSE; 524 else { 525 ttisp->tt_ttisgmt = *p++; 526 if (ttisp->tt_ttisgmt != TRUE && 527 ttisp->tt_ttisgmt != FALSE) 528 return -1; 529 } 530 } 531 /* 532 ** Out-of-sort ats should mean we're running on a 533 ** signed time_t system but using a data file with 534 ** unsigned values (or vice versa). 535 */ 536 for (i = 0; i < sp->timecnt - 2; ++i) 537 if (sp->ats[i] > sp->ats[i + 1]) { 538 ++i; 539 if (TYPE_SIGNED(time_t)) { 540 /* 541 ** Ignore the end (easy). 542 */ 543 sp->timecnt = i; 544 } else { 545 /* 546 ** Ignore the beginning (harder). 547 */ 548 register int j; 549 550 for (j = 0; j + i < sp->timecnt; ++j) { 551 sp->ats[j] = sp->ats[j + i]; 552 sp->types[j] = sp->types[j + i]; 553 } 554 sp->timecnt = j; 555 } 556 break; 557 } 558 /* 559 ** If this is an old file, we're done. 560 */ 561 if (u.tzhead.tzh_version[0] == '\0') 562 break; 563 nread -= p - u.buf; 564 for (i = 0; i < nread; ++i) 565 u.buf[i] = p[i]; 566 /* 567 ** If this is a narrow integer time_t system, we're done. 568 */ 569 if (stored >= (int) sizeof(time_t) && TYPE_INTEGRAL(time_t)) 570 break; 571 } 572 if (doextend && nread > 2 && 573 u.buf[0] == '\n' && u.buf[nread - 1] == '\n' && 574 sp->typecnt + 2 <= TZ_MAX_TYPES) { 575 struct state ts; 576 register int result; 577 578 u.buf[nread - 1] = '\0'; 579 result = tzparse(&u.buf[1], &ts, FALSE); 580 if (result == 0 && ts.typecnt == 2 && 581 sp->charcnt + ts.charcnt <= TZ_MAX_CHARS) { 582 for (i = 0; i < 2; ++i) 583 ts.ttis[i].tt_abbrind += 584 sp->charcnt; 585 for (i = 0; i < ts.charcnt; ++i) 586 sp->chars[sp->charcnt++] = 587 ts.chars[i]; 588 i = 0; 589 while (i < ts.timecnt && 590 ts.ats[i] <= 591 sp->ats[sp->timecnt - 1]) 592 ++i; 593 while (i < ts.timecnt && 594 sp->timecnt < TZ_MAX_TIMES) { 595 sp->ats[sp->timecnt] = 596 ts.ats[i]; 597 sp->types[sp->timecnt] = 598 sp->typecnt + 599 ts.types[i]; 600 ++sp->timecnt; 601 ++i; 602 } 603 sp->ttis[sp->typecnt++] = ts.ttis[0]; 604 sp->ttis[sp->typecnt++] = ts.ttis[1]; 605 } 606 } 607 sp->goback = sp->goahead = FALSE; 608 if (sp->timecnt > 1) { 609 for (i = 1; i < sp->timecnt; ++i) 610 if (typesequiv(sp, sp->types[i], sp->types[0]) && 611 differ_by_repeat(sp->ats[i], sp->ats[0])) { 612 sp->goback = TRUE; 613 break; 614 } 615 for (i = sp->timecnt - 2; i >= 0; --i) 616 if (typesequiv(sp, sp->types[sp->timecnt - 1], 617 sp->types[i]) && 618 differ_by_repeat(sp->ats[sp->timecnt - 1], 619 sp->ats[i])) { 620 sp->goahead = TRUE; 621 break; 622 } 623 } 624 return 0; 625} 626 627static int 628typesequiv(sp, a, b) 629const struct state * const sp; 630const int a; 631const int b; 632{ 633 register int result; 634 635 if (sp == NULL || 636 a < 0 || a >= sp->typecnt || 637 b < 0 || b >= sp->typecnt) 638 result = FALSE; 639 else { 640 register const struct ttinfo * ap = &sp->ttis[a]; 641 register const struct ttinfo * bp = &sp->ttis[b]; 642 result = ap->tt_gmtoff == bp->tt_gmtoff && 643 ap->tt_isdst == bp->tt_isdst && 644 ap->tt_ttisstd == bp->tt_ttisstd && 645 ap->tt_ttisgmt == bp->tt_ttisgmt && 646 strcmp(&sp->chars[ap->tt_abbrind], 647 &sp->chars[bp->tt_abbrind]) == 0; 648 } 649 return result; 650} 651 652static const int mon_lengths[2][MONSPERYEAR] = { 653 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 654 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } 655}; 656 657static const int year_lengths[2] = { 658 DAYSPERNYEAR, DAYSPERLYEAR 659}; 660 661/* 662** Given a pointer into a time zone string, scan until a character that is not 663** a valid character in a zone name is found. Return a pointer to that 664** character. 665*/ 666 667static const char * 668getzname(strp) 669const char * strp; 670{ 671 char c; 672 673 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && 674 c != '+') 675 ++strp; 676 return strp; 677} 678 679/* 680** Given a pointer into an extended time zone string, scan until the ending 681** delimiter of the zone name is located. Return a pointer to the delimiter. 682** 683** As with getzname above, the legal character set is actually quite 684** restricted, with other characters producing undefined results. 685** We don't do any checking here; checking is done later in common-case code. 686*/ 687 688static const char * 689getqzname(register const char *strp, const int delim) 690{ 691 register int c; 692 693 while ((c = *strp) != '\0' && c != delim) 694 ++strp; 695 return strp; 696} 697 698/* 699** Given a pointer into a time zone string, extract a number from that string. 700** Check that the number is within a specified range; if it is not, return 701** NULL. 702** Otherwise, return a pointer to the first character not part of the number. 703*/ 704 705static const char * 706getnum(strp, nump, min, max) 707const char * strp; 708int * const nump; 709const int min; 710const int max; 711{ 712 char c; 713 int num; 714 715 if (strp == NULL || !is_digit(c = *strp)) 716 return NULL; 717 num = 0; 718 do { 719 num = num * 10 + (c - '0'); 720 if (num > max) 721 return NULL; /* illegal value */ 722 c = *++strp; 723 } while (is_digit(c)); 724 if (num < min) 725 return NULL; /* illegal value */ 726 *nump = num; 727 return strp; 728} 729 730/* 731** Given a pointer into a time zone string, extract a number of seconds, 732** in hh[:mm[:ss]] form, from the string. 733** If any error occurs, return NULL. 734** Otherwise, return a pointer to the first character not part of the number 735** of seconds. 736*/ 737 738static const char * 739getsecs(strp, secsp) 740const char * strp; 741long * const secsp; 742{ 743 int num; 744 745 /* 746 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like 747 ** "M10.4.6/26", which does not conform to Posix, 748 ** but which specifies the equivalent of 749 ** ``02:00 on the first Sunday on or after 23 Oct''. 750 */ 751 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); 752 if (strp == NULL) 753 return NULL; 754 *secsp = num * (long) SECSPERHOUR; 755 if (*strp == ':') { 756 ++strp; 757 strp = getnum(strp, &num, 0, MINSPERHOUR - 1); 758 if (strp == NULL) 759 return NULL; 760 *secsp += num * SECSPERMIN; 761 if (*strp == ':') { 762 ++strp; 763 /* `SECSPERMIN' allows for leap seconds. */ 764 strp = getnum(strp, &num, 0, SECSPERMIN); 765 if (strp == NULL) 766 return NULL; 767 *secsp += num; 768 } 769 } 770 return strp; 771} 772 773/* 774** Given a pointer into a time zone string, extract an offset, in 775** [+-]hh[:mm[:ss]] form, from the string. 776** If any error occurs, return NULL. 777** Otherwise, return a pointer to the first character not part of the time. 778*/ 779 780static const char * 781getoffset(strp, offsetp) 782const char * strp; 783long * const offsetp; 784{ 785 int neg = 0; 786 787 if (*strp == '-') { 788 neg = 1; 789 ++strp; 790 } else if (*strp == '+') 791 ++strp; 792 strp = getsecs(strp, offsetp); 793 if (strp == NULL) 794 return NULL; /* illegal time */ 795 if (neg) 796 *offsetp = -*offsetp; 797 return strp; 798} 799 800/* 801** Given a pointer into a time zone string, extract a rule in the form 802** date[/time]. See POSIX section 8 for the format of "date" and "time". 803** If a valid rule is not found, return NULL. 804** Otherwise, return a pointer to the first character not part of the rule. 805*/ 806 807static const char * 808getrule(strp, rulep) 809const char * strp; 810struct rule * const rulep; 811{ 812 if (*strp == 'J') { 813 /* 814 ** Julian day. 815 */ 816 rulep->r_type = JULIAN_DAY; 817 ++strp; 818 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); 819 } else if (*strp == 'M') { 820 /* 821 ** Month, week, day. 822 */ 823 rulep->r_type = MONTH_NTH_DAY_OF_WEEK; 824 ++strp; 825 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); 826 if (strp == NULL) 827 return NULL; 828 if (*strp++ != '.') 829 return NULL; 830 strp = getnum(strp, &rulep->r_week, 1, 5); 831 if (strp == NULL) 832 return NULL; 833 if (*strp++ != '.') 834 return NULL; 835 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); 836 } else if (is_digit(*strp)) { 837 /* 838 ** Day of year. 839 */ 840 rulep->r_type = DAY_OF_YEAR; 841 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); 842 } else return NULL; /* invalid format */ 843 if (strp == NULL) 844 return NULL; 845 if (*strp == '/') { 846 /* 847 ** Time specified. 848 */ 849 ++strp; 850 strp = getsecs(strp, &rulep->r_time); 851 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ 852 return strp; 853} 854 855/* 856** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the 857** year, a rule, and the offset from UTC at the time that rule takes effect, 858** calculate the Epoch-relative time that rule takes effect. 859*/ 860 861static time_t 862transtime(janfirst, year, rulep, offset) 863const time_t janfirst; 864const int year; 865const struct rule * const rulep; 866const long offset; 867{ 868 int leapyear; 869 time_t value; 870 int i; 871 int d, m1, yy0, yy1, yy2, dow; 872 873 INITIALIZE(value); 874 leapyear = isleap(year); 875 switch (rulep->r_type) { 876 877 case JULIAN_DAY: 878 /* 879 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap 880 ** years. 881 ** In non-leap years, or if the day number is 59 or less, just 882 ** add SECSPERDAY times the day number-1 to the time of 883 ** January 1, midnight, to get the day. 884 */ 885 value = janfirst + (rulep->r_day - 1) * SECSPERDAY; 886 if (leapyear && rulep->r_day >= 60) 887 value += SECSPERDAY; 888 break; 889 890 case DAY_OF_YEAR: 891 /* 892 ** n - day of year. 893 ** Just add SECSPERDAY times the day number to the time of 894 ** January 1, midnight, to get the day. 895 */ 896 value = janfirst + rulep->r_day * SECSPERDAY; 897 break; 898 899 case MONTH_NTH_DAY_OF_WEEK: 900 /* 901 ** Mm.n.d - nth "dth day" of month m. 902 */ 903 value = janfirst; 904 for (i = 0; i < rulep->r_mon - 1; ++i) 905 value += mon_lengths[leapyear][i] * SECSPERDAY; 906 907 /* 908 ** Use Zeller's Congruence to get day-of-week of first day of 909 ** month. 910 */ 911 m1 = (rulep->r_mon + 9) % 12 + 1; 912 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; 913 yy1 = yy0 / 100; 914 yy2 = yy0 % 100; 915 dow = ((26 * m1 - 2) / 10 + 916 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; 917 if (dow < 0) 918 dow += DAYSPERWEEK; 919 920 /* 921 ** "dow" is the day-of-week of the first day of the month. Get 922 ** the day-of-month (zero-origin) of the first "dow" day of the 923 ** month. 924 */ 925 d = rulep->r_day - dow; 926 if (d < 0) 927 d += DAYSPERWEEK; 928 for (i = 1; i < rulep->r_week; ++i) { 929 if (d + DAYSPERWEEK >= 930 mon_lengths[leapyear][rulep->r_mon - 1]) 931 break; 932 d += DAYSPERWEEK; 933 } 934 935 /* 936 ** "d" is the day-of-month (zero-origin) of the day we want. 937 */ 938 value += d * SECSPERDAY; 939 break; 940 } 941 942 /* 943 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in 944 ** question. To get the Epoch-relative time of the specified local 945 ** time on that day, add the transition time and the current offset 946 ** from UTC. 947 */ 948 return value + rulep->r_time + offset; 949} 950 951/* 952** Given a POSIX section 8-style TZ string, fill in the rule tables as 953** appropriate. 954*/ 955 956static int 957tzparse(name, sp, lastditch) 958const char * name; 959struct state * const sp; 960const int lastditch; 961{ 962 const char * stdname; 963 const char * dstname; 964 size_t stdlen; 965 size_t dstlen; 966 long stdoffset; 967 long dstoffset; 968 time_t * atp; 969 unsigned char * typep; 970 char * cp; 971 int load_result; 972 973 INITIALIZE(dstname); 974 stdname = name; 975 if (lastditch) { 976 stdlen = strlen(name); /* length of standard zone name */ 977 name += stdlen; 978 if (stdlen >= sizeof sp->chars) 979 stdlen = (sizeof sp->chars) - 1; 980 stdoffset = 0; 981 } else { 982 if (*name == '<') { 983 name++; 984 stdname = name; 985 name = getqzname(name, '>'); 986 if (*name != '>') 987 return (-1); 988 stdlen = name - stdname; 989 name++; 990 } else { 991 name = getzname(name); 992 stdlen = name - stdname; 993 } 994 if (*name == '\0') 995 return -1; /* was "stdoffset = 0;" */ 996 else { 997 name = getoffset(name, &stdoffset); 998 if (name == NULL) 999 return -1; 1000 } 1001 } 1002 load_result = tzload(TZDEFRULES, sp, FALSE); 1003 if (load_result != 0) 1004 sp->leapcnt = 0; /* so, we're off a little */ 1005 if (*name != '\0') { 1006 if (*name == '<') { 1007 dstname = ++name; 1008 name = getqzname(name, '>'); 1009 if (*name != '>') 1010 return -1; 1011 dstlen = name - dstname; 1012 name++; 1013 } else { 1014 dstname = name; 1015 name = getzname(name); 1016 dstlen = name - dstname; /* length of DST zone name */ 1017 } 1018 if (*name != '\0' && *name != ',' && *name != ';') { 1019 name = getoffset(name, &dstoffset); 1020 if (name == NULL) 1021 return -1; 1022 } else dstoffset = stdoffset - SECSPERHOUR; 1023 if (*name == '\0' && load_result != 0) 1024 name = TZDEFRULESTRING; 1025 if (*name == ',' || *name == ';') { 1026 struct rule start; 1027 struct rule end; 1028 int year; 1029 time_t janfirst; 1030 time_t starttime; 1031 time_t endtime; 1032 1033 ++name; 1034 if ((name = getrule(name, &start)) == NULL) 1035 return -1; 1036 if (*name++ != ',') 1037 return -1; 1038 if ((name = getrule(name, &end)) == NULL) 1039 return -1; 1040 if (*name != '\0') 1041 return -1; 1042 sp->typecnt = 2; /* standard time and DST */ 1043 /* 1044 ** Two transitions per year, from EPOCH_YEAR forward. 1045 */ 1046 sp->ttis[0].tt_gmtoff = -dstoffset; 1047 sp->ttis[0].tt_isdst = 1; 1048 sp->ttis[0].tt_abbrind = stdlen + 1; 1049 sp->ttis[1].tt_gmtoff = -stdoffset; 1050 sp->ttis[1].tt_isdst = 0; 1051 sp->ttis[1].tt_abbrind = 0; 1052 atp = sp->ats; 1053 typep = sp->types; 1054 janfirst = 0; 1055 sp->timecnt = 0; 1056 for (year = EPOCH_YEAR; 1057 sp->timecnt + 2 <= TZ_MAX_TIMES; 1058 ++year) { 1059 time_t newfirst; 1060 1061 starttime = transtime(janfirst, year, &start, 1062 stdoffset); 1063 endtime = transtime(janfirst, year, &end, 1064 dstoffset); 1065 if (starttime > endtime) { 1066 *atp++ = endtime; 1067 *typep++ = 1; /* DST ends */ 1068 *atp++ = starttime; 1069 *typep++ = 0; /* DST begins */ 1070 } else { 1071 *atp++ = starttime; 1072 *typep++ = 0; /* DST begins */ 1073 *atp++ = endtime; 1074 *typep++ = 1; /* DST ends */ 1075 } 1076 sp->timecnt += 2; 1077 newfirst = janfirst; 1078 newfirst += year_lengths[isleap(year)] * 1079 SECSPERDAY; 1080 if (newfirst <= janfirst) 1081 break; 1082 janfirst = newfirst; 1083 } 1084 } else { 1085 long theirstdoffset; 1086 long theirdstoffset; 1087 long theiroffset; 1088 int isdst; 1089 int i; 1090 int j; 1091 1092 if (*name != '\0') 1093 return -1; 1094 /* 1095 ** Initial values of theirstdoffset and theirdstoffset. 1096 */ 1097 theirstdoffset = 0; 1098 for (i = 0; i < sp->timecnt; ++i) { 1099 j = sp->types[i]; 1100 if (!sp->ttis[j].tt_isdst) { 1101 theirstdoffset = 1102 -sp->ttis[j].tt_gmtoff; 1103 break; 1104 } 1105 } 1106 theirdstoffset = 0; 1107 for (i = 0; i < sp->timecnt; ++i) { 1108 j = sp->types[i]; 1109 if (sp->ttis[j].tt_isdst) { 1110 theirdstoffset = 1111 -sp->ttis[j].tt_gmtoff; 1112 break; 1113 } 1114 } 1115 /* 1116 ** Initially we're assumed to be in standard time. 1117 */ 1118 isdst = FALSE; 1119 theiroffset = theirstdoffset; 1120 /* 1121 ** Now juggle transition times and types 1122 ** tracking offsets as you do. 1123 */ 1124 for (i = 0; i < sp->timecnt; ++i) { 1125 j = sp->types[i]; 1126 sp->types[i] = sp->ttis[j].tt_isdst; 1127 if (sp->ttis[j].tt_ttisgmt) { 1128 /* No adjustment to transition time */ 1129 } else { 1130 /* 1131 ** If summer time is in effect, and the 1132 ** transition time was not specified as 1133 ** standard time, add the summer time 1134 ** offset to the transition time; 1135 ** otherwise, add the standard time 1136 ** offset to the transition time. 1137 */ 1138 /* 1139 ** Transitions from DST to DDST 1140 ** will effectively disappear since 1141 ** POSIX provides for only one DST 1142 ** offset. 1143 */ 1144 if (isdst && !sp->ttis[j].tt_ttisstd) { 1145 sp->ats[i] += dstoffset - 1146 theirdstoffset; 1147 } else { 1148 sp->ats[i] += stdoffset - 1149 theirstdoffset; 1150 } 1151 } 1152 theiroffset = -sp->ttis[j].tt_gmtoff; 1153 if (sp->ttis[j].tt_isdst) 1154 theirdstoffset = theiroffset; 1155 else theirstdoffset = theiroffset; 1156 } 1157 /* 1158 ** Finally, fill in ttis. 1159 ** ttisstd and ttisgmt need not be handled. 1160 */ 1161 sp->ttis[0].tt_gmtoff = -stdoffset; 1162 sp->ttis[0].tt_isdst = FALSE; 1163 sp->ttis[0].tt_abbrind = 0; 1164 sp->ttis[1].tt_gmtoff = -dstoffset; 1165 sp->ttis[1].tt_isdst = TRUE; 1166 sp->ttis[1].tt_abbrind = stdlen + 1; 1167 sp->typecnt = 2; 1168 } 1169 } else { 1170 dstlen = 0; 1171 sp->typecnt = 1; /* only standard time */ 1172 sp->timecnt = 0; 1173 sp->ttis[0].tt_gmtoff = -stdoffset; 1174 sp->ttis[0].tt_isdst = 0; 1175 sp->ttis[0].tt_abbrind = 0; 1176 } 1177 sp->charcnt = stdlen + 1; 1178 if (dstlen != 0) 1179 sp->charcnt += dstlen + 1; 1180 if ((size_t) sp->charcnt > sizeof sp->chars) 1181 return -1; 1182 cp = sp->chars; 1183 (void) strncpy(cp, stdname, stdlen); 1184 cp += stdlen; 1185 *cp++ = '\0'; 1186 if (dstlen != 0) { 1187 (void) strncpy(cp, dstname, dstlen); 1188 *(cp + dstlen) = '\0'; 1189 } 1190 return 0; 1191} 1192 1193static void 1194gmtload(sp) 1195struct state * const sp; 1196{ 1197 if (tzload(gmt, sp, TRUE) != 0) 1198 (void) tzparse(gmt, sp, TRUE); 1199} 1200 1201static void 1202tzsetwall_basic(int rdlocked) 1203{ 1204 if (!rdlocked) 1205 _RWLOCK_RDLOCK(&lcl_rwlock); 1206 if (lcl_is_set < 0) { 1207 if (!rdlocked) 1208 _RWLOCK_UNLOCK(&lcl_rwlock); 1209 return; 1210 } 1211 _RWLOCK_UNLOCK(&lcl_rwlock); 1212 1213 _RWLOCK_WRLOCK(&lcl_rwlock); 1214 lcl_is_set = -1; 1215 1216#ifdef ALL_STATE 1217 if (lclptr == NULL) { 1218 lclptr = (struct state *) malloc(sizeof *lclptr); 1219 if (lclptr == NULL) { 1220 settzname(); /* all we can do */ 1221 _RWLOCK_UNLOCK(&lcl_rwlock); 1222 if (rdlocked) 1223 _RWLOCK_RDLOCK(&lcl_rwlock); 1224 return; 1225 } 1226 } 1227#endif /* defined ALL_STATE */ 1228 if (tzload((char *) NULL, lclptr, TRUE) != 0) 1229 gmtload(lclptr); 1230 settzname(); 1231 _RWLOCK_UNLOCK(&lcl_rwlock); 1232 1233 if (rdlocked) 1234 _RWLOCK_RDLOCK(&lcl_rwlock); 1235} 1236 1237void 1238tzsetwall(void) 1239{ 1240 tzsetwall_basic(0); 1241} 1242 1243static void 1244tzset_basic(int rdlocked) 1245{ 1246 const char * name; 1247 1248 name = getenv("TZ"); 1249 if (name == NULL) { 1250 tzsetwall_basic(rdlocked); 1251 return; 1252 } 1253 1254 if (!rdlocked) 1255 _RWLOCK_RDLOCK(&lcl_rwlock); 1256 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) { 1257 if (!rdlocked) 1258 _RWLOCK_UNLOCK(&lcl_rwlock); 1259 return; 1260 } 1261 _RWLOCK_UNLOCK(&lcl_rwlock); 1262 1263 _RWLOCK_WRLOCK(&lcl_rwlock); 1264 lcl_is_set = strlen(name) < sizeof lcl_TZname; 1265 if (lcl_is_set) 1266 (void) strcpy(lcl_TZname, name); 1267 1268#ifdef ALL_STATE 1269 if (lclptr == NULL) { 1270 lclptr = (struct state *) malloc(sizeof *lclptr); 1271 if (lclptr == NULL) { 1272 settzname(); /* all we can do */ 1273 _RWLOCK_UNLOCK(&lcl_rwlock); 1274 if (rdlocked) 1275 _RWLOCK_RDLOCK(&lcl_rwlock); 1276 return; 1277 } 1278 } 1279#endif /* defined ALL_STATE */ 1280 if (*name == '\0') { 1281 /* 1282 ** User wants it fast rather than right. 1283 */ 1284 lclptr->leapcnt = 0; /* so, we're off a little */ 1285 lclptr->timecnt = 0; 1286 lclptr->typecnt = 0; 1287 lclptr->ttis[0].tt_isdst = 0; 1288 lclptr->ttis[0].tt_gmtoff = 0; 1289 lclptr->ttis[0].tt_abbrind = 0; 1290 (void) strcpy(lclptr->chars, gmt); 1291 } else if (tzload(name, lclptr, TRUE) != 0) 1292 if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0) 1293 (void) gmtload(lclptr); 1294 settzname(); 1295 _RWLOCK_UNLOCK(&lcl_rwlock); 1296 1297 if (rdlocked) 1298 _RWLOCK_RDLOCK(&lcl_rwlock); 1299} 1300 1301void 1302tzset(void) 1303{ 1304 tzset_basic(0); 1305} 1306 1307/* 1308** The easy way to behave "as if no library function calls" localtime 1309** is to not call it--so we drop its guts into "localsub", which can be 1310** freely called. (And no, the PANS doesn't require the above behavior-- 1311** but it *is* desirable.) 1312** 1313** The unused offset argument is for the benefit of mktime variants. 1314*/ 1315 1316/*ARGSUSED*/ 1317static struct tm * 1318localsub(timep, offset, tmp) 1319const time_t * const timep; 1320const long offset; 1321struct tm * const tmp; 1322{ 1323 struct state * sp; 1324 const struct ttinfo * ttisp; 1325 int i; 1326 struct tm * result; 1327 const time_t t = *timep; 1328 1329 sp = lclptr; 1330#ifdef ALL_STATE 1331 if (sp == NULL) 1332 return gmtsub(timep, offset, tmp); 1333#endif /* defined ALL_STATE */ 1334 if ((sp->goback && t < sp->ats[0]) || 1335 (sp->goahead && t > sp->ats[sp->timecnt - 1])) { 1336 time_t newt = t; 1337 register time_t seconds; 1338 register time_t tcycles; 1339 register int_fast64_t icycles; 1340 1341 if (t < sp->ats[0]) 1342 seconds = sp->ats[0] - t; 1343 else seconds = t - sp->ats[sp->timecnt - 1]; 1344 --seconds; 1345 tcycles = seconds / YEARSPERREPEAT / AVGSECSPERYEAR; 1346 ++tcycles; 1347 icycles = tcycles; 1348 if (tcycles - icycles >= 1 || icycles - tcycles >= 1) 1349 return NULL; 1350 seconds = icycles; 1351 seconds *= YEARSPERREPEAT; 1352 seconds *= AVGSECSPERYEAR; 1353 if (t < sp->ats[0]) 1354 newt += seconds; 1355 else newt -= seconds; 1356 if (newt < sp->ats[0] || 1357 newt > sp->ats[sp->timecnt - 1]) 1358 return NULL; /* "cannot happen" */ 1359 result = localsub(&newt, offset, tmp); 1360 if (result == tmp) { 1361 register time_t newy; 1362 1363 newy = tmp->tm_year; 1364 if (t < sp->ats[0]) 1365 newy -= icycles * YEARSPERREPEAT; 1366 else newy += icycles * YEARSPERREPEAT; 1367 tmp->tm_year = newy; 1368 if (tmp->tm_year != newy) 1369 return NULL; 1370 } 1371 return result; 1372 } 1373 if (sp->timecnt == 0 || t < sp->ats[0]) { 1374 i = 0; 1375 while (sp->ttis[i].tt_isdst) 1376 if (++i >= sp->typecnt) { 1377 i = 0; 1378 break; 1379 } 1380 } else { 1381 register int lo = 1; 1382 register int hi = sp->timecnt; 1383 1384 while (lo < hi) { 1385 register int mid = (lo + hi) >> 1; 1386 1387 if (t < sp->ats[mid]) 1388 hi = mid; 1389 else lo = mid + 1; 1390 } 1391 i = (int) sp->types[lo - 1]; 1392 } 1393 ttisp = &sp->ttis[i]; 1394 /* 1395 ** To get (wrong) behavior that's compatible with System V Release 2.0 1396 ** you'd replace the statement below with 1397 ** t += ttisp->tt_gmtoff; 1398 ** timesub(&t, 0L, sp, tmp); 1399 */ 1400 result = timesub(&t, ttisp->tt_gmtoff, sp, tmp); 1401 tmp->tm_isdst = ttisp->tt_isdst; 1402 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; 1403#ifdef TM_ZONE 1404 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; 1405#endif /* defined TM_ZONE */ 1406 return result; 1407} 1408 1409struct tm * 1410localtime(timep) 1411const time_t * const timep; 1412{ 1413 static pthread_mutex_t localtime_mutex = PTHREAD_MUTEX_INITIALIZER; 1414 static pthread_key_t localtime_key = -1; 1415 struct tm *p_tm; 1416 1417 if (__isthreaded != 0) { 1418 if (localtime_key < 0) { 1419 _pthread_mutex_lock(&localtime_mutex); 1420 if (localtime_key < 0) { 1421 if (_pthread_key_create(&localtime_key, free) < 0) { 1422 _pthread_mutex_unlock(&localtime_mutex); 1423 return(NULL); 1424 } 1425 } 1426 _pthread_mutex_unlock(&localtime_mutex); 1427 } 1428 p_tm = _pthread_getspecific(localtime_key); 1429 if (p_tm == NULL) { 1430 if ((p_tm = (struct tm *)malloc(sizeof(struct tm))) 1431 == NULL) 1432 return(NULL); 1433 _pthread_setspecific(localtime_key, p_tm); 1434 } 1435 _RWLOCK_RDLOCK(&lcl_rwlock); 1436 tzset_basic(1); 1437 localsub(timep, 0L, p_tm); 1438 _RWLOCK_UNLOCK(&lcl_rwlock); 1439 return(p_tm); 1440 } else { 1441 tzset_basic(0); 1442 localsub(timep, 0L, &tm); 1443 return(&tm); 1444 } 1445} 1446 1447/* 1448** Re-entrant version of localtime. 1449*/ 1450 1451struct tm * 1452localtime_r(timep, tmp) 1453const time_t * const timep; 1454struct tm * tmp; 1455{ 1456 _RWLOCK_RDLOCK(&lcl_rwlock); 1457 tzset_basic(1); 1458 localsub(timep, 0L, tmp); 1459 _RWLOCK_UNLOCK(&lcl_rwlock); 1460 return tmp; 1461} 1462 1463/* 1464** gmtsub is to gmtime as localsub is to localtime. 1465*/ 1466 1467static struct tm * 1468gmtsub(timep, offset, tmp) 1469const time_t * const timep; 1470const long offset; 1471struct tm * const tmp; 1472{ 1473 register struct tm * result; 1474 1475 _MUTEX_LOCK(&gmt_mutex); 1476 if (!gmt_is_set) { 1477#ifdef ALL_STATE 1478 gmtptr = (struct state *) malloc(sizeof *gmtptr); 1479 if (gmtptr != NULL) 1480#endif /* defined ALL_STATE */ 1481 gmtload(gmtptr); 1482 gmt_is_set = TRUE; 1483 } 1484 _MUTEX_UNLOCK(&gmt_mutex); 1485 result = timesub(timep, offset, gmtptr, tmp); 1486#ifdef TM_ZONE 1487 /* 1488 ** Could get fancy here and deliver something such as 1489 ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero, 1490 ** but this is no time for a treasure hunt. 1491 */ 1492 if (offset != 0) 1493 tmp->TM_ZONE = wildabbr; 1494 else { 1495#ifdef ALL_STATE 1496 if (gmtptr == NULL) 1497 tmp->TM_ZONE = gmt; 1498 else tmp->TM_ZONE = gmtptr->chars; 1499#endif /* defined ALL_STATE */ 1500#ifndef ALL_STATE 1501 tmp->TM_ZONE = gmtptr->chars; 1502#endif /* State Farm */ 1503 } 1504#endif /* defined TM_ZONE */ 1505 return result; 1506} 1507 1508struct tm * 1509gmtime(timep) 1510const time_t * const timep; 1511{ 1512 static pthread_mutex_t gmtime_mutex = PTHREAD_MUTEX_INITIALIZER; 1513 static pthread_key_t gmtime_key = -1; 1514 struct tm *p_tm; 1515 1516 if (__isthreaded != 0) { 1517 if (gmtime_key < 0) { 1518 _pthread_mutex_lock(&gmtime_mutex); 1519 if (gmtime_key < 0) { 1520 if (_pthread_key_create(&gmtime_key, free) < 0) { 1521 _pthread_mutex_unlock(&gmtime_mutex); 1522 return(NULL); 1523 } 1524 } 1525 _pthread_mutex_unlock(&gmtime_mutex); 1526 } 1527 /* 1528 * Changed to follow POSIX.1 threads standard, which 1529 * is what BSD currently has. 1530 */ 1531 if ((p_tm = _pthread_getspecific(gmtime_key)) == NULL) { 1532 if ((p_tm = (struct tm *)malloc(sizeof(struct tm))) 1533 == NULL) { 1534 return(NULL); 1535 } 1536 _pthread_setspecific(gmtime_key, p_tm); 1537 } 1538 gmtsub(timep, 0L, p_tm); 1539 return(p_tm); 1540 } 1541 else { 1542 gmtsub(timep, 0L, &tm); 1543 return(&tm); 1544 } 1545} 1546 1547/* 1548* Re-entrant version of gmtime. 1549*/ 1550 1551struct tm * 1552gmtime_r(timep, tmp) 1553const time_t * const timep; 1554struct tm * tmp; 1555{ 1556 return gmtsub(timep, 0L, tmp); 1557} 1558 1559#ifdef STD_INSPIRED 1560 1561struct tm * 1562offtime(timep, offset) 1563const time_t * const timep; 1564const long offset; 1565{ 1566 return gmtsub(timep, offset, &tm); 1567} 1568 1569#endif /* defined STD_INSPIRED */ 1570 1571/* 1572** Return the number of leap years through the end of the given year 1573** where, to make the math easy, the answer for year zero is defined as zero. 1574*/ 1575 1576static int 1577leaps_thru_end_of(y) 1578register const int y; 1579{ 1580 return (y >= 0) ? (y / 4 - y / 100 + y / 400) : 1581 -(leaps_thru_end_of(-(y + 1)) + 1); 1582} 1583 1584static struct tm * 1585timesub(timep, offset, sp, tmp) 1586const time_t * const timep; 1587const long offset; 1588const struct state * const sp; 1589struct tm * const tmp; 1590{ 1591 const struct lsinfo * lp; 1592 time_t tdays; 1593 int idays; /* unsigned would be so 2003 */ 1594 long rem; 1595 int y; 1596 const int * ip; 1597 long corr; 1598 int hit; 1599 int i; 1600 1601 corr = 0; 1602 hit = 0; 1603#ifdef ALL_STATE 1604 i = (sp == NULL) ? 0 : sp->leapcnt; 1605#endif /* defined ALL_STATE */ 1606#ifndef ALL_STATE 1607 i = sp->leapcnt; 1608#endif /* State Farm */ 1609 while (--i >= 0) { 1610 lp = &sp->lsis[i]; 1611 if (*timep >= lp->ls_trans) { 1612 if (*timep == lp->ls_trans) { 1613 hit = ((i == 0 && lp->ls_corr > 0) || 1614 lp->ls_corr > sp->lsis[i - 1].ls_corr); 1615 if (hit) 1616 while (i > 0 && 1617 sp->lsis[i].ls_trans == 1618 sp->lsis[i - 1].ls_trans + 1 && 1619 sp->lsis[i].ls_corr == 1620 sp->lsis[i - 1].ls_corr + 1) { 1621 ++hit; 1622 --i; 1623 } 1624 } 1625 corr = lp->ls_corr; 1626 break; 1627 } 1628 } 1629 y = EPOCH_YEAR; 1630 tdays = *timep / SECSPERDAY; 1631 rem = *timep - tdays * SECSPERDAY; 1632 while (tdays < 0 || tdays >= year_lengths[isleap(y)]) { 1633 int newy; 1634 register time_t tdelta; 1635 register int idelta; 1636 register int leapdays; 1637 1638 tdelta = tdays / DAYSPERLYEAR; 1639 idelta = tdelta; 1640 if (tdelta - idelta >= 1 || idelta - tdelta >= 1) 1641 return NULL; 1642 if (idelta == 0) 1643 idelta = (tdays < 0) ? -1 : 1; 1644 newy = y; 1645 if (increment_overflow(&newy, idelta)) 1646 return NULL; 1647 leapdays = leaps_thru_end_of(newy - 1) - 1648 leaps_thru_end_of(y - 1); 1649 tdays -= ((time_t) newy - y) * DAYSPERNYEAR; 1650 tdays -= leapdays; 1651 y = newy; 1652 } 1653 { 1654 register long seconds; 1655 1656 seconds = tdays * SECSPERDAY + 0.5; 1657 tdays = seconds / SECSPERDAY; 1658 rem += seconds - tdays * SECSPERDAY; 1659 } 1660 /* 1661 ** Given the range, we can now fearlessly cast... 1662 */ 1663 idays = tdays; 1664 rem += offset - corr; 1665 while (rem < 0) { 1666 rem += SECSPERDAY; 1667 --idays; 1668 } 1669 while (rem >= SECSPERDAY) { 1670 rem -= SECSPERDAY; 1671 ++idays; 1672 } 1673 while (idays < 0) { 1674 if (increment_overflow(&y, -1)) 1675 return NULL; 1676 idays += year_lengths[isleap(y)]; 1677 } 1678 while (idays >= year_lengths[isleap(y)]) { 1679 idays -= year_lengths[isleap(y)]; 1680 if (increment_overflow(&y, 1)) 1681 return NULL; 1682 } 1683 tmp->tm_year = y; 1684 if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE)) 1685 return NULL; 1686 tmp->tm_yday = idays; 1687 /* 1688 ** The "extra" mods below avoid overflow problems. 1689 */ 1690 tmp->tm_wday = EPOCH_WDAY + 1691 ((y - EPOCH_YEAR) % DAYSPERWEEK) * 1692 (DAYSPERNYEAR % DAYSPERWEEK) + 1693 leaps_thru_end_of(y - 1) - 1694 leaps_thru_end_of(EPOCH_YEAR - 1) + 1695 idays; 1696 tmp->tm_wday %= DAYSPERWEEK; 1697 if (tmp->tm_wday < 0) 1698 tmp->tm_wday += DAYSPERWEEK; 1699 tmp->tm_hour = (int) (rem / SECSPERHOUR); 1700 rem %= SECSPERHOUR; 1701 tmp->tm_min = (int) (rem / SECSPERMIN); 1702 /* 1703 ** A positive leap second requires a special 1704 ** representation. This uses "... ??:59:60" et seq. 1705 */ 1706 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; 1707 ip = mon_lengths[isleap(y)]; 1708 for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon)) 1709 idays -= ip[tmp->tm_mon]; 1710 tmp->tm_mday = (int) (idays + 1); 1711 tmp->tm_isdst = 0; 1712#ifdef TM_GMTOFF 1713 tmp->TM_GMTOFF = offset; 1714#endif /* defined TM_GMTOFF */ 1715 return tmp; 1716} 1717 1718char * 1719ctime(timep) 1720const time_t * const timep; 1721{ 1722/* 1723** Section 4.12.3.2 of X3.159-1989 requires that 1724** The ctime function converts the calendar time pointed to by timer 1725** to local time in the form of a string. It is equivalent to 1726** asctime(localtime(timer)) 1727*/ 1728 return asctime(localtime(timep)); 1729} 1730 1731char * 1732ctime_r(timep, buf) 1733const time_t * const timep; 1734char * buf; 1735{ 1736 struct tm mytm; 1737 1738 return asctime_r(localtime_r(timep, &mytm), buf); 1739} 1740 1741/* 1742** Adapted from code provided by Robert Elz, who writes: 1743** The "best" way to do mktime I think is based on an idea of Bob 1744** Kridle's (so its said...) from a long time ago. 1745** It does a binary search of the time_t space. Since time_t's are 1746** just 32 bits, its a max of 32 iterations (even at 64 bits it 1747** would still be very reasonable). 1748*/ 1749 1750#ifndef WRONG 1751#define WRONG (-1) 1752#endif /* !defined WRONG */ 1753 1754/* 1755** Simplified normalize logic courtesy Paul Eggert. 1756*/ 1757 1758static int 1759increment_overflow(number, delta) 1760int * number; 1761int delta; 1762{ 1763 int number0; 1764 1765 number0 = *number; 1766 *number += delta; 1767 return (*number < number0) != (delta < 0); 1768} 1769 1770static int 1771long_increment_overflow(number, delta) 1772long * number; 1773int delta; 1774{ 1775 long number0; 1776 1777 number0 = *number; 1778 *number += delta; 1779 return (*number < number0) != (delta < 0); 1780} 1781 1782static int 1783normalize_overflow(tensptr, unitsptr, base) 1784int * const tensptr; 1785int * const unitsptr; 1786const int base; 1787{ 1788 int tensdelta; 1789 1790 tensdelta = (*unitsptr >= 0) ? 1791 (*unitsptr / base) : 1792 (-1 - (-1 - *unitsptr) / base); 1793 *unitsptr -= tensdelta * base; 1794 return increment_overflow(tensptr, tensdelta); 1795} 1796 1797static int 1798long_normalize_overflow(tensptr, unitsptr, base) 1799long * const tensptr; 1800int * const unitsptr; 1801const int base; 1802{ 1803 register int tensdelta; 1804 1805 tensdelta = (*unitsptr >= 0) ? 1806 (*unitsptr / base) : 1807 (-1 - (-1 - *unitsptr) / base); 1808 *unitsptr -= tensdelta * base; 1809 return long_increment_overflow(tensptr, tensdelta); 1810} 1811 1812static int 1813tmcomp(atmp, btmp) 1814const struct tm * const atmp; 1815const struct tm * const btmp; 1816{ 1817 int result; 1818 1819 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && 1820 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && 1821 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && 1822 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && 1823 (result = (atmp->tm_min - btmp->tm_min)) == 0) 1824 result = atmp->tm_sec - btmp->tm_sec; 1825 return result; 1826} 1827 1828static time_t 1829time2sub(tmp, funcp, offset, okayp, do_norm_secs) 1830struct tm * const tmp; 1831struct tm * (* const funcp)(const time_t*, long, struct tm*); 1832const long offset; 1833int * const okayp; 1834const int do_norm_secs; 1835{ 1836 const struct state * sp; 1837 int dir; 1838 int i, j; 1839 int saved_seconds; 1840 long li; 1841 time_t lo; 1842 time_t hi; 1843 long y; 1844 time_t newt; 1845 time_t t; 1846 struct tm yourtm, mytm; 1847 1848 *okayp = FALSE; 1849 yourtm = *tmp; 1850 if (do_norm_secs) { 1851 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec, 1852 SECSPERMIN)) 1853 return WRONG; 1854 } 1855 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) 1856 return WRONG; 1857 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) 1858 return WRONG; 1859 y = yourtm.tm_year; 1860 if (long_normalize_overflow(&y, &yourtm.tm_mon, MONSPERYEAR)) 1861 return WRONG; 1862 /* 1863 ** Turn y into an actual year number for now. 1864 ** It is converted back to an offset from TM_YEAR_BASE later. 1865 */ 1866 if (long_increment_overflow(&y, TM_YEAR_BASE)) 1867 return WRONG; 1868 while (yourtm.tm_mday <= 0) { 1869 if (long_increment_overflow(&y, -1)) 1870 return WRONG; 1871 li = y + (1 < yourtm.tm_mon); 1872 yourtm.tm_mday += year_lengths[isleap(li)]; 1873 } 1874 while (yourtm.tm_mday > DAYSPERLYEAR) { 1875 li = y + (1 < yourtm.tm_mon); 1876 yourtm.tm_mday -= year_lengths[isleap(li)]; 1877 if (long_increment_overflow(&y, 1)) 1878 return WRONG; 1879 } 1880 for ( ; ; ) { 1881 i = mon_lengths[isleap(y)][yourtm.tm_mon]; 1882 if (yourtm.tm_mday <= i) 1883 break; 1884 yourtm.tm_mday -= i; 1885 if (++yourtm.tm_mon >= MONSPERYEAR) { 1886 yourtm.tm_mon = 0; 1887 if (long_increment_overflow(&y, 1)) 1888 return WRONG; 1889 } 1890 } 1891 if (long_increment_overflow(&y, -TM_YEAR_BASE)) 1892 return WRONG; 1893 yourtm.tm_year = y; 1894 if (yourtm.tm_year != y) 1895 return WRONG; 1896 /* Don't go below 1900 for POLA */ 1897 if (yourtm.tm_year < 0) 1898 return WRONG; 1899 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN) 1900 saved_seconds = 0; 1901 else if (y + TM_YEAR_BASE < EPOCH_YEAR) { 1902 /* 1903 ** We can't set tm_sec to 0, because that might push the 1904 ** time below the minimum representable time. 1905 ** Set tm_sec to 59 instead. 1906 ** This assumes that the minimum representable time is 1907 ** not in the same minute that a leap second was deleted from, 1908 ** which is a safer assumption than using 58 would be. 1909 */ 1910 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) 1911 return WRONG; 1912 saved_seconds = yourtm.tm_sec; 1913 yourtm.tm_sec = SECSPERMIN - 1; 1914 } else { 1915 saved_seconds = yourtm.tm_sec; 1916 yourtm.tm_sec = 0; 1917 } 1918 /* 1919 ** Do a binary search (this works whatever time_t's type is). 1920 */ 1921 if (!TYPE_SIGNED(time_t)) { 1922 lo = 0; 1923 hi = lo - 1; 1924 } else if (!TYPE_INTEGRAL(time_t)) { 1925 if (sizeof(time_t) > sizeof(float)) 1926 hi = (time_t) DBL_MAX; 1927 else hi = (time_t) FLT_MAX; 1928 lo = -hi; 1929 } else { 1930 lo = 1; 1931 for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i) 1932 lo *= 2; 1933 hi = -(lo + 1); 1934 } 1935 for ( ; ; ) { 1936 t = lo / 2 + hi / 2; 1937 if (t < lo) 1938 t = lo; 1939 else if (t > hi) 1940 t = hi; 1941 if ((*funcp)(&t, offset, &mytm) == NULL) { 1942 /* 1943 ** Assume that t is too extreme to be represented in 1944 ** a struct tm; arrange things so that it is less 1945 ** extreme on the next pass. 1946 */ 1947 dir = (t > 0) ? 1 : -1; 1948 } else dir = tmcomp(&mytm, &yourtm); 1949 if (dir != 0) { 1950 if (t == lo) { 1951 ++t; 1952 if (t <= lo) 1953 return WRONG; 1954 ++lo; 1955 } else if (t == hi) { 1956 --t; 1957 if (t >= hi) 1958 return WRONG; 1959 --hi; 1960 } 1961 if (lo > hi) 1962 return WRONG; 1963 if (dir > 0) 1964 hi = t; 1965 else lo = t; 1966 continue; 1967 } 1968 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) 1969 break; 1970 /* 1971 ** Right time, wrong type. 1972 ** Hunt for right time, right type. 1973 ** It's okay to guess wrong since the guess 1974 ** gets checked. 1975 */ 1976 sp = (const struct state *) 1977 ((funcp == localsub) ? lclptr : gmtptr); 1978#ifdef ALL_STATE 1979 if (sp == NULL) 1980 return WRONG; 1981#endif /* defined ALL_STATE */ 1982 for (i = sp->typecnt - 1; i >= 0; --i) { 1983 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) 1984 continue; 1985 for (j = sp->typecnt - 1; j >= 0; --j) { 1986 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) 1987 continue; 1988 newt = t + sp->ttis[j].tt_gmtoff - 1989 sp->ttis[i].tt_gmtoff; 1990 if ((*funcp)(&newt, offset, &mytm) == NULL) 1991 continue; 1992 if (tmcomp(&mytm, &yourtm) != 0) 1993 continue; 1994 if (mytm.tm_isdst != yourtm.tm_isdst) 1995 continue; 1996 /* 1997 ** We have a match. 1998 */ 1999 t = newt; 2000 goto label; 2001 } 2002 } 2003 return WRONG; 2004 } 2005label: 2006 newt = t + saved_seconds; 2007 if ((newt < t) != (saved_seconds < 0)) 2008 return WRONG; 2009 t = newt; 2010 if ((*funcp)(&t, offset, tmp)) 2011 *okayp = TRUE; 2012 return t; 2013} 2014 2015static time_t 2016time2(tmp, funcp, offset, okayp) 2017struct tm * const tmp; 2018struct tm * (* const funcp)(const time_t*, long, struct tm*); 2019const long offset; 2020int * const okayp; 2021{ 2022 time_t t; 2023 2024 /* 2025 ** First try without normalization of seconds 2026 ** (in case tm_sec contains a value associated with a leap second). 2027 ** If that fails, try with normalization of seconds. 2028 */ 2029 t = time2sub(tmp, funcp, offset, okayp, FALSE); 2030 return *okayp ? t : time2sub(tmp, funcp, offset, okayp, TRUE); 2031} 2032 2033static time_t 2034time1(tmp, funcp, offset) 2035struct tm * const tmp; 2036struct tm * (* const funcp)(const time_t *, long, struct tm *); 2037const long offset; 2038{ 2039 time_t t; 2040 const struct state * sp; 2041 int samei, otheri; 2042 int sameind, otherind; 2043 int i; 2044 int nseen; 2045 int seen[TZ_MAX_TYPES]; 2046 int types[TZ_MAX_TYPES]; 2047 int okay; 2048 2049 if (tmp->tm_isdst > 1) 2050 tmp->tm_isdst = 1; 2051 t = time2(tmp, funcp, offset, &okay); 2052#ifdef PCTS 2053 /* 2054 ** PCTS code courtesy Grant Sullivan. 2055 */ 2056 if (okay) 2057 return t; 2058 if (tmp->tm_isdst < 0) 2059 tmp->tm_isdst = 0; /* reset to std and try again */ 2060#endif /* defined PCTS */ 2061#ifndef PCTS 2062 if (okay || tmp->tm_isdst < 0) 2063 return t; 2064#endif /* !defined PCTS */ 2065 /* 2066 ** We're supposed to assume that somebody took a time of one type 2067 ** and did some math on it that yielded a "struct tm" that's bad. 2068 ** We try to divine the type they started from and adjust to the 2069 ** type they need. 2070 */ 2071 sp = (const struct state *) ((funcp == localsub) ? lclptr : gmtptr); 2072#ifdef ALL_STATE 2073 if (sp == NULL) 2074 return WRONG; 2075#endif /* defined ALL_STATE */ 2076 for (i = 0; i < sp->typecnt; ++i) 2077 seen[i] = FALSE; 2078 nseen = 0; 2079 for (i = sp->timecnt - 1; i >= 0; --i) 2080 if (!seen[sp->types[i]]) { 2081 seen[sp->types[i]] = TRUE; 2082 types[nseen++] = sp->types[i]; 2083 } 2084 for (sameind = 0; sameind < nseen; ++sameind) { 2085 samei = types[sameind]; 2086 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) 2087 continue; 2088 for (otherind = 0; otherind < nseen; ++otherind) { 2089 otheri = types[otherind]; 2090 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) 2091 continue; 2092 tmp->tm_sec += sp->ttis[otheri].tt_gmtoff - 2093 sp->ttis[samei].tt_gmtoff; 2094 tmp->tm_isdst = !tmp->tm_isdst; 2095 t = time2(tmp, funcp, offset, &okay); 2096 if (okay) 2097 return t; 2098 tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff - 2099 sp->ttis[samei].tt_gmtoff; 2100 tmp->tm_isdst = !tmp->tm_isdst; 2101 } 2102 } 2103 return WRONG; 2104} 2105 2106time_t 2107mktime(tmp) 2108struct tm * const tmp; 2109{ 2110 time_t mktime_return_value; 2111 _RWLOCK_RDLOCK(&lcl_rwlock); 2112 tzset_basic(1); 2113 mktime_return_value = time1(tmp, localsub, 0L); 2114 _RWLOCK_UNLOCK(&lcl_rwlock); 2115 return(mktime_return_value); 2116} 2117 2118#ifdef STD_INSPIRED 2119 2120time_t 2121timelocal(tmp) 2122struct tm * const tmp; 2123{ 2124 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 2125 return mktime(tmp); 2126} 2127 2128time_t 2129timegm(tmp) 2130struct tm * const tmp; 2131{ 2132 tmp->tm_isdst = 0; 2133 return time1(tmp, gmtsub, 0L); 2134} 2135 2136time_t 2137timeoff(tmp, offset) 2138struct tm * const tmp; 2139const long offset; 2140{ 2141 tmp->tm_isdst = 0; 2142 return time1(tmp, gmtsub, offset); 2143} 2144 2145#endif /* defined STD_INSPIRED */ 2146 2147#ifdef CMUCS 2148 2149/* 2150** The following is supplied for compatibility with 2151** previous versions of the CMUCS runtime library. 2152*/ 2153 2154long 2155gtime(tmp) 2156struct tm * const tmp; 2157{ 2158 const time_t t = mktime(tmp); 2159 2160 if (t == WRONG) 2161 return -1; 2162 return t; 2163} 2164 2165#endif /* defined CMUCS */ 2166 2167/* 2168** XXX--is the below the right way to conditionalize?? 2169*/ 2170 2171#ifdef STD_INSPIRED 2172 2173/* 2174** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 2175** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which 2176** is not the case if we are accounting for leap seconds. 2177** So, we provide the following conversion routines for use 2178** when exchanging timestamps with POSIX conforming systems. 2179*/ 2180 2181static long 2182leapcorr(timep) 2183time_t * timep; 2184{ 2185 struct state * sp; 2186 struct lsinfo * lp; 2187 int i; 2188 2189 sp = lclptr; 2190 i = sp->leapcnt; 2191 while (--i >= 0) { 2192 lp = &sp->lsis[i]; 2193 if (*timep >= lp->ls_trans) 2194 return lp->ls_corr; 2195 } 2196 return 0; 2197} 2198 2199time_t 2200time2posix(t) 2201time_t t; 2202{ 2203 tzset(); 2204 return t - leapcorr(&t); 2205} 2206 2207time_t 2208posix2time(t) 2209time_t t; 2210{ 2211 time_t x; 2212 time_t y; 2213 2214 tzset(); 2215 /* 2216 ** For a positive leap second hit, the result 2217 ** is not unique. For a negative leap second 2218 ** hit, the corresponding time doesn't exist, 2219 ** so we return an adjacent second. 2220 */ 2221 x = t + leapcorr(&t); 2222 y = x - leapcorr(&x); 2223 if (y < t) { 2224 do { 2225 x++; 2226 y = x - leapcorr(&x); 2227 } while (y < t); 2228 if (t != y) 2229 return x - 1; 2230 } else if (y > t) { 2231 do { 2232 --x; 2233 y = x - leapcorr(&x); 2234 } while (y > t); 2235 if (t != y) 2236 return x + 1; 2237 } 2238 return x; 2239} 2240 2241#endif /* defined STD_INSPIRED */ 2242