localtime.c revision 1.41.6.2
1 /* $NetBSD: localtime.c,v 1.41.6.2 2008/11/08 21:45:38 christos Exp $ */ 2 3 /* 4 ** This file is in the public domain, so clarified as of 5 ** 1996-06-05 by Arthur David Olson (arthur_david_olson (at) nih.gov). 6 */ 7 8 #include <sys/cdefs.h> 9 #if defined(LIBC_SCCS) && !defined(lint) 10 #if 0 11 static char elsieid[] = "@(#)localtime.c 7.78"; 12 #else 13 __RCSID("$NetBSD: localtime.c,v 1.41.6.2 2008/11/08 21:45:38 christos Exp $"); 14 #endif 15 #endif /* LIBC_SCCS and not lint */ 16 17 /* 18 ** Leap second handling from Bradley White (bww (at) k.gp.cs.cmu.edu). 19 ** POSIX-style TZ environment variable handling from Guy Harris 20 ** (guy (at) auspex.com). 21 */ 22 23 /*LINTLIBRARY*/ 24 25 #include "namespace.h" 26 #include "private.h" 27 #include "tzfile.h" 28 #include "fcntl.h" 29 #include "reentrant.h" 30 31 #if defined(__weak_alias) && !defined(__LIBC12_SOURCE__) 32 __weak_alias(daylight,_daylight) 33 __weak_alias(tzname,_tzname) 34 __weak_alias(tzset,_tzset) 35 __weak_alias(tzsetwall,_tzsetwall) 36 #endif 37 38 /* 39 ** SunOS 4.1.1 headers lack O_BINARY. 40 */ 41 42 #ifdef O_BINARY 43 #define OPEN_MODE (O_RDONLY | O_BINARY) 44 #endif /* defined O_BINARY */ 45 #ifndef O_BINARY 46 #define OPEN_MODE O_RDONLY 47 #endif /* !defined O_BINARY */ 48 49 #ifndef WILDABBR 50 /* 51 ** Someone might make incorrect use of a time zone abbreviation: 52 ** 1. They might reference tzname[0] before calling tzset (explicitly 53 ** or implicitly). 54 ** 2. They might reference tzname[1] before calling tzset (explicitly 55 ** or implicitly). 56 ** 3. They might reference tzname[1] after setting to a time zone 57 ** in which Daylight Saving Time is never observed. 58 ** 4. They might reference tzname[0] after setting to a time zone 59 ** in which Standard Time is never observed. 60 ** 5. They might reference tm.TM_ZONE after calling offtime. 61 ** What's best to do in the above cases is open to debate; 62 ** for now, we just set things up so that in any of the five cases 63 ** WILDABBR is used. Another possibility: initialize tzname[0] to the 64 ** string "tzname[0] used before set", and similarly for the other cases. 65 ** And another: initialize tzname[0] to "ERA", with an explanation in the 66 ** manual page of what this "time zone abbreviation" means (doing this so 67 ** that tzname[0] has the "normal" length of three characters). 68 */ 69 #define WILDABBR " " 70 #endif /* !defined WILDABBR */ 71 72 static const char wildabbr[] = "WILDABBR"; 73 74 static const char gmt[] = "GMT"; 75 76 /* 77 ** The DST rules to use if TZ has no rules and we can't load TZDEFRULES. 78 ** We default to US rules as of 1999-08-17. 79 ** POSIX 1003.1 section 8.1.1 says that the default DST rules are 80 ** implementation dependent; for historical reasons, US rules are a 81 ** common default. 82 */ 83 #ifndef TZDEFRULESTRING 84 #define TZDEFRULESTRING ",M4.1.0,M10.5.0" 85 #endif /* !defined TZDEFDST */ 86 87 struct ttinfo { /* time type information */ 88 long tt_gmtoff; /* UTC offset in seconds */ 89 int tt_isdst; /* used to set tm_isdst */ 90 int tt_abbrind; /* abbreviation list index */ 91 int tt_ttisstd; /* TRUE if transition is std time */ 92 int tt_ttisgmt; /* TRUE if transition is UTC */ 93 }; 94 95 struct lsinfo { /* leap second information */ 96 time_t ls_trans; /* transition time */ 97 long ls_corr; /* correction to apply */ 98 }; 99 100 #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) 101 102 #ifdef TZNAME_MAX 103 #define MY_TZNAME_MAX TZNAME_MAX 104 #endif /* defined TZNAME_MAX */ 105 #ifndef TZNAME_MAX 106 #define MY_TZNAME_MAX 255 107 #endif /* !defined TZNAME_MAX */ 108 109 struct state { 110 int leapcnt; 111 int timecnt; 112 int typecnt; 113 int charcnt; 114 time_t ats[TZ_MAX_TIMES]; /* time_t */ 115 unsigned char types[TZ_MAX_TIMES]; 116 struct ttinfo ttis[TZ_MAX_TYPES]; 117 char chars[/*CONSTCOND*/BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt), 118 (2 * (MY_TZNAME_MAX + 1)))]; 119 struct lsinfo lsis[TZ_MAX_LEAPS]; 120 }; 121 122 struct rule { 123 int r_type; /* type of rule--see below */ 124 int r_day; /* day number of rule */ 125 int r_week; /* week number of rule */ 126 int r_mon; /* month number of rule */ 127 long r_time; /* transition time of rule */ 128 }; 129 130 #define JULIAN_DAY 0 /* Jn - Julian day */ 131 #define DAY_OF_YEAR 1 /* n - day of year */ 132 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */ 133 134 /* 135 ** Prototypes for static functions. 136 */ 137 138 static long detzcode P((const char * codep)); 139 static const char * __getzname P((const char * strp)); 140 static const char * getnum P((const char * strp, int * nump, int min, 141 int max)); 142 static const char * getsecs P((const char * strp, long * secsp)); 143 static const char * __getoffset P((const char * strp, long * offsetp)); 144 static const char * __getrule P((const char * strp, struct rule * rulep)); 145 static void __gmtload P((struct state * sp)); 146 static void gmtsub P((const time_t * timep, long offset, 147 struct tm * tmp)); 148 static void localsub P((const time_t * timep, long offset, 149 struct tm * tmp)); 150 static int increment_overflow P((int * number, int delta)); 151 static int normalize_overflow P((int * tensptr, int * unitsptr, 152 int base)); 153 static void __settzname P((void)); 154 static time_t time1 P((struct tm * tmp, 155 void(*funcp) P((const time_t *, 156 long, struct tm *)), 157 long offset)); 158 static time_t time2 P((struct tm *tmp, 159 void(*funcp) P((const time_t *, 160 long, struct tm*)), 161 long offset, int * okayp)); 162 static time_t time2sub P((struct tm *tmp, 163 void(*funcp) P((const time_t *, 164 long, struct tm*)), 165 long offset, int * okayp, int do_norm_secs)); 166 static void timesub P((const time_t * timep, long offset, 167 const struct state * sp, struct tm * tmp)); 168 static int tmcomp P((const struct tm * atmp, 169 const struct tm * btmp)); 170 static time_t __transtime P((time_t janfirst, int year, 171 const struct rule * rulep, long offset)); 172 static int __tzload P((const char * name, struct state * sp)); 173 static int __tzparse P((const char * name, struct state * sp, 174 int lastditch)); 175 static void __tzset_unlocked P((void)); 176 static void __tzsetwall_unlocked P((void)); 177 #ifdef STD_INSPIRED 178 static long leapcorr P((time_t * timep)); 179 #endif 180 181 #ifdef ALL_STATE 182 static struct state * lclptr; 183 static struct state * gmtptr; 184 #endif /* defined ALL_STATE */ 185 186 #ifndef ALL_STATE 187 static struct state lclmem; 188 static struct state gmtmem; 189 #define lclptr (&lclmem) 190 #define gmtptr (&gmtmem) 191 #endif /* State Farm */ 192 193 #ifndef TZ_STRLEN_MAX 194 #define TZ_STRLEN_MAX 255 195 #endif /* !defined TZ_STRLEN_MAX */ 196 197 #if !defined(__LIBC12_SOURCE__) 198 199 char __lcl_TZname[TZ_STRLEN_MAX + 1]; 200 int __lcl_is_set; 201 int __gmt_is_set; 202 203 __aconst char * tzname[2] = { 204 (__aconst char *)__UNCONST(wildabbr), 205 (__aconst char *)__UNCONST(wildabbr) 206 }; 207 208 #else 209 210 extern char __lcl_TZname[TZ_STRLEN_MAX + 1]; 211 extern int __lcl_is_set; 212 extern int __gmt_is_set; 213 214 extern __aconst char * tzname[2]; 215 216 #endif 217 218 #ifdef _REENTRANT 219 static rwlock_t __lcl_lock = RWLOCK_INITIALIZER; 220 #endif 221 222 /* 223 ** Section 4.12.3 of X3.159-1989 requires that 224 ** Except for the strftime function, these functions [asctime, 225 ** ctime, gmtime, localtime] return values in one of two static 226 ** objects: a broken-down time structure and an array of char. 227 ** Thanks to Paul Eggert (eggert (at) twinsun.com) for noting this. 228 */ 229 230 static struct tm tm; 231 232 #ifdef USG_COMPAT 233 #if !defined(__LIBC12_SOURCE__) 234 long timezone = 0; 235 int daylight = 0; 236 #else 237 extern int daylight; 238 extern int timezone; 239 #endif 240 #endif /* defined USG_COMPAT */ 241 242 #ifdef ALTZONE 243 time_t altzone = 0; 244 #endif /* defined ALTZONE */ 245 246 static long 247 detzcode(codep) 248 const char * const codep; 249 { 250 register long result; 251 252 /* 253 ** The first character must be sign extended on systems with >32bit 254 ** longs. This was solved differently in the master tzcode sources 255 ** (the fix first appeared in tzcode95c.tar.gz). But I believe 256 ** that this implementation is superior. 257 */ 258 259 #define SIGN_EXTEND_CHAR(x) ((signed char) x) 260 261 result = (SIGN_EXTEND_CHAR(codep[0]) << 24) \ 262 | (codep[1] & 0xff) << 16 \ 263 | (codep[2] & 0xff) << 8 264 | (codep[3] & 0xff); 265 return result; 266 } 267 268 void 269 __settzname P((void)) 270 { 271 register struct state * const sp = lclptr; 272 register int i; 273 274 tzname[0] = (__aconst char *)__UNCONST(wildabbr); 275 tzname[1] = (__aconst char *)__UNCONST(wildabbr); 276 #ifdef USG_COMPAT 277 daylight = 0; 278 timezone = 0; 279 #endif /* defined USG_COMPAT */ 280 #ifdef ALTZONE 281 altzone = 0; 282 #endif /* defined ALTZONE */ 283 #ifdef ALL_STATE 284 if (sp == NULL) { 285 tzname[0] = tzname[1] = (__aconst char *)__UNCONST(gmt); 286 return; 287 } 288 #endif /* defined ALL_STATE */ 289 for (i = 0; i < sp->typecnt; ++i) { 290 register const struct ttinfo * const ttisp = &sp->ttis[i]; 291 292 tzname[ttisp->tt_isdst] = 293 &sp->chars[ttisp->tt_abbrind]; 294 } 295 /* 296 ** And to get the latest zone names into tzname. . . 297 */ 298 for (i = 0; i < sp->timecnt; ++i) { 299 register const struct ttinfo * const ttisp = 300 &sp->ttis[ 301 sp->types[i]]; 302 303 tzname[ttisp->tt_isdst] = 304 &sp->chars[ttisp->tt_abbrind]; 305 #ifdef USG_COMPAT 306 if (ttisp->tt_isdst) 307 daylight = 1; 308 if (i == 0 || !ttisp->tt_isdst) 309 timezone = -(ttisp->tt_gmtoff); 310 #endif /* defined USG_COMPAT */ 311 #ifdef ALTZONE 312 if (i == 0 || ttisp->tt_isdst) 313 altzone = -(ttisp->tt_gmtoff); 314 #endif /* defined ALTZONE */ 315 } 316 } 317 318 int 319 __tzload(name, sp) 320 register const char * name; 321 register struct state * const sp; 322 { 323 register const char * p; 324 register int i; 325 register int fid; 326 327 if (name == NULL && (name = TZDEFAULT) == NULL) 328 return -1; 329 330 { 331 register int doaccess; 332 /* 333 ** Section 4.9.1 of the C standard says that 334 ** "FILENAME_MAX expands to an integral constant expression 335 ** that is the size needed for an array of char large enough 336 ** to hold the longest file name string that the implementation 337 ** guarantees can be opened." 338 */ 339 char fullname[FILENAME_MAX + 1]; 340 341 if (name[0] == ':') 342 ++name; 343 doaccess = name[0] == '/'; 344 if (!doaccess) { 345 if ((p = TZDIR) == NULL) 346 return -1; 347 if ((strlen(p) + strlen(name) + 1) >= sizeof fullname) 348 return -1; 349 (void) strcpy(fullname, p); /* XXX strcpy is safe */ 350 (void) strcat(fullname, "/"); /* XXX strcat is safe */ 351 (void) strcat(fullname, name); /* XXX strcat is safe */ 352 /* 353 ** Set doaccess if '.' (as in "../") shows up in name. 354 */ 355 if (strchr(name, '.') != NULL) 356 doaccess = TRUE; 357 name = fullname; 358 } 359 if (doaccess && access(name, R_OK) != 0) 360 return -1; 361 /* 362 * XXX potential security problem here if user of a set-id 363 * program has set TZ (which is passed in as name) here, 364 * and uses a race condition trick to defeat the access(2) 365 * above. 366 */ 367 if ((fid = open(name, OPEN_MODE)) == -1) 368 return -1; 369 } 370 { 371 struct tzhead * tzhp; 372 union { 373 struct tzhead tzhead; 374 char buf[sizeof *sp + sizeof *tzhp]; 375 } u; 376 int ttisstdcnt; 377 int ttisgmtcnt; 378 379 i = read(fid, u.buf, sizeof u.buf); 380 if (close(fid) != 0) 381 return -1; 382 ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt); 383 ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt); 384 sp->leapcnt = (int) detzcode(u.tzhead.tzh_leapcnt); 385 sp->timecnt = (int) detzcode(u.tzhead.tzh_timecnt); 386 sp->typecnt = (int) detzcode(u.tzhead.tzh_typecnt); 387 sp->charcnt = (int) detzcode(u.tzhead.tzh_charcnt); 388 p = u.tzhead.tzh_charcnt + sizeof u.tzhead.tzh_charcnt; 389 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || 390 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || 391 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || 392 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS || 393 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) || 394 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0)) 395 return -1; 396 if (i - (p - u.buf) < sp->timecnt * 4 + /* ats */ 397 sp->timecnt + /* types */ 398 sp->typecnt * (4 + 2) + /* ttinfos */ 399 sp->charcnt + /* chars */ 400 sp->leapcnt * (4 + 4) + /* lsinfos */ 401 ttisstdcnt + /* ttisstds */ 402 ttisgmtcnt) /* ttisgmts */ 403 return -1; 404 for (i = 0; i < sp->timecnt; ++i) { 405 sp->ats[i] = detzcode(p); 406 p += 4; 407 } 408 for (i = 0; i < sp->timecnt; ++i) { 409 sp->types[i] = (unsigned char) *p++; 410 if (sp->types[i] >= sp->typecnt) 411 return -1; 412 } 413 for (i = 0; i < sp->typecnt; ++i) { 414 register struct ttinfo * ttisp; 415 416 ttisp = &sp->ttis[i]; 417 ttisp->tt_gmtoff = detzcode(p); 418 p += 4; 419 ttisp->tt_isdst = (unsigned char) *p++; 420 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) 421 return -1; 422 ttisp->tt_abbrind = (unsigned char) *p++; 423 if (ttisp->tt_abbrind < 0 || 424 ttisp->tt_abbrind > sp->charcnt) 425 return -1; 426 } 427 for (i = 0; i < sp->charcnt; ++i) 428 sp->chars[i] = *p++; 429 sp->chars[i] = '\0'; /* ensure '\0' at end */ 430 for (i = 0; i < sp->leapcnt; ++i) { 431 register struct lsinfo * lsisp; 432 433 lsisp = &sp->lsis[i]; 434 lsisp->ls_trans = detzcode(p); 435 p += 4; 436 lsisp->ls_corr = detzcode(p); 437 p += 4; 438 } 439 for (i = 0; i < sp->typecnt; ++i) { 440 register struct ttinfo * ttisp; 441 442 ttisp = &sp->ttis[i]; 443 if (ttisstdcnt == 0) 444 ttisp->tt_ttisstd = FALSE; 445 else { 446 ttisp->tt_ttisstd = *p++; 447 if (ttisp->tt_ttisstd != TRUE && 448 ttisp->tt_ttisstd != FALSE) 449 return -1; 450 } 451 } 452 for (i = 0; i < sp->typecnt; ++i) { 453 register struct ttinfo * ttisp; 454 455 ttisp = &sp->ttis[i]; 456 if (ttisgmtcnt == 0) 457 ttisp->tt_ttisgmt = FALSE; 458 else { 459 ttisp->tt_ttisgmt = *p++; 460 if (ttisp->tt_ttisgmt != TRUE && 461 ttisp->tt_ttisgmt != FALSE) 462 return -1; 463 } 464 } 465 } 466 return 0; 467 } 468 469 static const int mon_lengths[2][MONSPERYEAR] = { 470 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 471 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } 472 }; 473 474 static const int year_lengths[2] = { 475 DAYSPERNYEAR, DAYSPERLYEAR 476 }; 477 478 /* 479 ** Given a pointer into a time zone string, scan until a character that is not 480 ** a valid character in a zone name is found. Return a pointer to that 481 ** character. 482 */ 483 484 static const char * 485 __getzname(strp) 486 register const char * strp; 487 { 488 register char c; 489 490 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && 491 c != '+') 492 ++strp; 493 return strp; 494 } 495 496 /* 497 ** Given a pointer into a time zone string, extract a number from that string. 498 ** Check that the number is within a specified range; if it is not, return 499 ** NULL. 500 ** Otherwise, return a pointer to the first character not part of the number. 501 */ 502 503 static const char * 504 getnum(strp, nump, min, max) 505 register const char * strp; 506 int * const nump; 507 const int min; 508 const int max; 509 { 510 register char c; 511 register int num; 512 513 if (strp == NULL || !is_digit(c = *strp)) 514 return NULL; 515 num = 0; 516 do { 517 num = num * 10 + (c - '0'); 518 if (num > max) 519 return NULL; /* illegal value */ 520 c = *++strp; 521 } while (is_digit(c)); 522 if (num < min) 523 return NULL; /* illegal value */ 524 *nump = num; 525 return strp; 526 } 527 528 /* 529 ** Given a pointer into a time zone string, extract a number of seconds, 530 ** in hh[:mm[:ss]] form, from the string. 531 ** If any error occurs, return NULL. 532 ** Otherwise, return a pointer to the first character not part of the number 533 ** of seconds. 534 */ 535 536 static const char * 537 getsecs(strp, secsp) 538 register const char * strp; 539 long * const secsp; 540 { 541 int num; 542 543 /* 544 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like 545 ** "M10.4.6/26", which does not conform to Posix, 546 ** but which specifies the equivalent of 547 ** ``02:00 on the first Sunday on or after 23 Oct''. 548 */ 549 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); 550 if (strp == NULL) 551 return NULL; 552 *secsp = num * (long) SECSPERHOUR; 553 if (*strp == ':') { 554 ++strp; 555 strp = getnum(strp, &num, 0, MINSPERHOUR - 1); 556 if (strp == NULL) 557 return NULL; 558 *secsp += num * SECSPERMIN; 559 if (*strp == ':') { 560 ++strp; 561 /* `SECSPERMIN' allows for leap seconds. */ 562 strp = getnum(strp, &num, 0, SECSPERMIN); 563 if (strp == NULL) 564 return NULL; 565 *secsp += num; 566 } 567 } 568 return strp; 569 } 570 571 /* 572 ** Given a pointer into a time zone string, extract an offset, in 573 ** [+-]hh[:mm[:ss]] form, from the string. 574 ** If any error occurs, return NULL. 575 ** Otherwise, return a pointer to the first character not part of the time. 576 */ 577 578 static const char * 579 __getoffset(strp, offsetp) 580 register const char * strp; 581 long * const offsetp; 582 { 583 register int neg = 0; 584 585 if (*strp == '-') { 586 neg = 1; 587 ++strp; 588 } else if (*strp == '+') 589 ++strp; 590 strp = getsecs(strp, offsetp); 591 if (strp == NULL) 592 return NULL; /* illegal time */ 593 if (neg) 594 *offsetp = -*offsetp; 595 return strp; 596 } 597 598 /* 599 ** Given a pointer into a time zone string, extract a rule in the form 600 ** date[/time]. See POSIX section 8 for the format of "date" and "time". 601 ** If a valid rule is not found, return NULL. 602 ** Otherwise, return a pointer to the first character not part of the rule. 603 */ 604 605 static const char * 606 __getrule(strp, rulep) 607 const char * strp; 608 register struct rule * const rulep; 609 { 610 if (*strp == 'J') { 611 /* 612 ** Julian day. 613 */ 614 rulep->r_type = JULIAN_DAY; 615 ++strp; 616 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); 617 } else if (*strp == 'M') { 618 /* 619 ** Month, week, day. 620 */ 621 rulep->r_type = MONTH_NTH_DAY_OF_WEEK; 622 ++strp; 623 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); 624 if (strp == NULL) 625 return NULL; 626 if (*strp++ != '.') 627 return NULL; 628 strp = getnum(strp, &rulep->r_week, 1, 5); 629 if (strp == NULL) 630 return NULL; 631 if (*strp++ != '.') 632 return NULL; 633 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); 634 } else if (is_digit(*strp)) { 635 /* 636 ** Day of year. 637 */ 638 rulep->r_type = DAY_OF_YEAR; 639 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); 640 } else return NULL; /* invalid format */ 641 if (strp == NULL) 642 return NULL; 643 if (*strp == '/') { 644 /* 645 ** Time specified. 646 */ 647 ++strp; 648 strp = getsecs(strp, &rulep->r_time); 649 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ 650 return strp; 651 } 652 653 /* 654 ** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the 655 ** year, a rule, and the offset from UTC at the time that rule takes effect, 656 ** calculate the Epoch-relative time that rule takes effect. 657 */ 658 659 static time_t 660 __transtime(janfirst, year, rulep, offset) 661 const time_t janfirst; 662 const int year; 663 register const struct rule * const rulep; 664 const long offset; 665 { 666 register int leapyear; 667 register time_t value; 668 register int i; 669 int d, m1, yy0, yy1, yy2, dow; 670 671 INITIALIZE(value); 672 leapyear = isleap(year); 673 switch (rulep->r_type) { 674 675 case JULIAN_DAY: 676 /* 677 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap 678 ** years. 679 ** In non-leap years, or if the day number is 59 or less, just 680 ** add SECSPERDAY times the day number-1 to the time of 681 ** January 1, midnight, to get the day. 682 */ 683 value = janfirst + (rulep->r_day - 1) * SECSPERDAY; 684 if (leapyear && rulep->r_day >= 60) 685 value += SECSPERDAY; 686 break; 687 688 case DAY_OF_YEAR: 689 /* 690 ** n - day of year. 691 ** Just add SECSPERDAY times the day number to the time of 692 ** January 1, midnight, to get the day. 693 */ 694 value = janfirst + rulep->r_day * SECSPERDAY; 695 break; 696 697 case MONTH_NTH_DAY_OF_WEEK: 698 /* 699 ** Mm.n.d - nth "dth day" of month m. 700 */ 701 value = janfirst; 702 for (i = 0; i < rulep->r_mon - 1; ++i) 703 value += mon_lengths[leapyear][i] * SECSPERDAY; 704 705 /* 706 ** Use Zeller's Congruence to get day-of-week of first day of 707 ** month. 708 */ 709 m1 = (rulep->r_mon + 9) % 12 + 1; 710 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; 711 yy1 = yy0 / 100; 712 yy2 = yy0 % 100; 713 dow = ((26 * m1 - 2) / 10 + 714 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; 715 if (dow < 0) 716 dow += DAYSPERWEEK; 717 718 /* 719 ** "dow" is the day-of-week of the first day of the month. Get 720 ** the day-of-month (zero-origin) of the first "dow" day of the 721 ** month. 722 */ 723 d = rulep->r_day - dow; 724 if (d < 0) 725 d += DAYSPERWEEK; 726 for (i = 1; i < rulep->r_week; ++i) { 727 if (d + DAYSPERWEEK >= 728 mon_lengths[leapyear][rulep->r_mon - 1]) 729 break; 730 d += DAYSPERWEEK; 731 } 732 733 /* 734 ** "d" is the day-of-month (zero-origin) of the day we want. 735 */ 736 value += d * SECSPERDAY; 737 break; 738 } 739 740 /* 741 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in 742 ** question. To get the Epoch-relative time of the specified local 743 ** time on that day, add the transition time and the current offset 744 ** from UTC. 745 */ 746 return value + rulep->r_time + offset; 747 } 748 749 /* 750 ** Given a POSIX section 8-style TZ string, fill in the rule tables as 751 ** appropriate. 752 */ 753 754 static int 755 __tzparse(name, sp, lastditch) 756 const char * name; 757 register struct state * const sp; 758 const int lastditch; 759 { 760 const char * stdname; 761 const char * dstname; 762 size_t stdlen; 763 size_t dstlen; 764 long stdoffset; 765 long dstoffset; 766 register time_t * atp; 767 register unsigned char * typep; 768 register char * cp; 769 register int load_result; 770 771 INITIALIZE(dstname); 772 stdname = name; 773 if (lastditch) { 774 stdlen = strlen(name); /* length of standard zone name */ 775 name += stdlen; 776 if (stdlen >= sizeof sp->chars) 777 stdlen = (sizeof sp->chars) - 1; 778 stdoffset = 0; 779 } else { 780 name = __getzname(name); 781 stdlen = name - stdname; 782 if (stdlen < 3) 783 return -1; 784 if (*name == '\0') 785 return -1; 786 name = __getoffset(name, &stdoffset); 787 if (name == NULL) 788 return -1; 789 } 790 load_result = __tzload(TZDEFRULES, sp); 791 if (load_result != 0) 792 sp->leapcnt = 0; /* so, we're off a little */ 793 if (*name != '\0') { 794 dstname = name; 795 name = __getzname(name); 796 dstlen = name - dstname; /* length of DST zone name */ 797 if (dstlen < 3) 798 return -1; 799 if (*name != '\0' && *name != ',' && *name != ';') { 800 name = __getoffset(name, &dstoffset); 801 if (name == NULL) 802 return -1; 803 } else dstoffset = stdoffset - SECSPERHOUR; 804 if (*name == '\0' && load_result != 0) 805 name = TZDEFRULESTRING; 806 if (*name == ',' || *name == ';') { 807 struct rule start; 808 struct rule end; 809 register int year; 810 register time_t janfirst; 811 time_t starttime; 812 time_t endtime; 813 814 ++name; 815 if ((name = __getrule(name, &start)) == NULL) 816 return -1; 817 if (*name++ != ',') 818 return -1; 819 if ((name = __getrule(name, &end)) == NULL) 820 return -1; 821 if (*name != '\0') 822 return -1; 823 sp->typecnt = 2; /* standard time and DST */ 824 /* 825 ** Two transitions per year, from EPOCH_YEAR to 2037. 826 */ 827 sp->timecnt = 2 * (2037 - EPOCH_YEAR + 1); 828 if (sp->timecnt > TZ_MAX_TIMES) 829 return -1; 830 sp->ttis[0].tt_gmtoff = -dstoffset; 831 sp->ttis[0].tt_isdst = 1; 832 sp->ttis[0].tt_abbrind = stdlen + 1; 833 sp->ttis[1].tt_gmtoff = -stdoffset; 834 sp->ttis[1].tt_isdst = 0; 835 sp->ttis[1].tt_abbrind = 0; 836 atp = sp->ats; 837 typep = sp->types; 838 janfirst = 0; 839 for (year = EPOCH_YEAR; year <= 2037; ++year) { 840 starttime = __transtime(janfirst, year, &start, 841 stdoffset); 842 endtime = __transtime(janfirst, year, &end, 843 dstoffset); 844 if (starttime > endtime) { 845 *atp++ = endtime; 846 *typep++ = 1; /* DST ends */ 847 *atp++ = starttime; 848 *typep++ = 0; /* DST begins */ 849 } else { 850 *atp++ = starttime; 851 *typep++ = 0; /* DST begins */ 852 *atp++ = endtime; 853 *typep++ = 1; /* DST ends */ 854 } 855 janfirst += year_lengths[isleap(year)] * 856 SECSPERDAY; 857 } 858 } else { 859 register long theirstdoffset; 860 register long theiroffset; 861 register int i; 862 register int j; 863 864 if (*name != '\0') 865 return -1; 866 /* 867 ** Initial values of theirstdoffset 868 */ 869 theirstdoffset = 0; 870 for (i = 0; i < sp->timecnt; ++i) { 871 j = sp->types[i]; 872 if (!sp->ttis[j].tt_isdst) { 873 theirstdoffset = 874 -sp->ttis[j].tt_gmtoff; 875 break; 876 } 877 } 878 /* 879 ** Initially we're assumed to be in standard time. 880 */ 881 theiroffset = theirstdoffset; 882 /* 883 ** Now juggle transition times and types 884 ** tracking offsets as you do. 885 */ 886 for (i = 0; i < sp->timecnt; ++i) { 887 j = sp->types[i]; 888 sp->types[i] = sp->ttis[j].tt_isdst; 889 if (sp->ttis[j].tt_ttisgmt) { 890 /* No adjustment to transition time */ 891 } else { 892 /* 893 ** If summer time is in effect, and the 894 ** transition time was not specified as 895 ** standard time, add the summer time 896 ** offset to the transition time; 897 ** otherwise, add the standard time 898 ** offset to the transition time. 899 */ 900 /* 901 ** Transitions from DST to DDST 902 ** will effectively disappear since 903 ** POSIX provides for only one DST 904 ** offset. 905 */ 906 sp->ats[i] += stdoffset - 907 theirstdoffset; 908 } 909 theiroffset = -sp->ttis[j].tt_gmtoff; 910 if (!sp->ttis[j].tt_isdst) 911 theirstdoffset = theiroffset; 912 } 913 /* 914 ** Finally, fill in ttis. 915 ** ttisstd and ttisgmt need not be handled. 916 */ 917 sp->ttis[0].tt_gmtoff = -stdoffset; 918 sp->ttis[0].tt_isdst = FALSE; 919 sp->ttis[0].tt_abbrind = 0; 920 sp->ttis[1].tt_gmtoff = -dstoffset; 921 sp->ttis[1].tt_isdst = TRUE; 922 sp->ttis[1].tt_abbrind = stdlen + 1; 923 sp->typecnt = 2; 924 } 925 } else { 926 dstlen = 0; 927 sp->typecnt = 1; /* only standard time */ 928 sp->timecnt = 0; 929 sp->ttis[0].tt_gmtoff = -stdoffset; 930 sp->ttis[0].tt_isdst = 0; 931 sp->ttis[0].tt_abbrind = 0; 932 } 933 sp->charcnt = stdlen + 1; 934 if (dstlen != 0) 935 sp->charcnt += dstlen + 1; 936 if ((size_t) sp->charcnt > sizeof sp->chars) 937 return -1; 938 cp = sp->chars; 939 (void) strncpy(cp, stdname, stdlen); 940 cp += stdlen; 941 *cp++ = '\0'; 942 if (dstlen != 0) { 943 (void) strncpy(cp, dstname, dstlen); 944 *(cp + dstlen) = '\0'; 945 } 946 return 0; 947 } 948 949 static void 950 __gmtload(sp) 951 struct state * const sp; 952 { 953 if (__tzload(gmt, sp) != 0) 954 (void) __tzparse(gmt, sp, TRUE); 955 } 956 957 static void 958 __tzsetwall_unlocked P((void)) 959 { 960 if (__lcl_is_set < 0) 961 return; 962 __lcl_is_set = -1; 963 964 #ifdef ALL_STATE 965 if (lclptr == NULL) { 966 int saveerrno = errno; 967 lclptr = (struct state *) malloc(sizeof *lclptr); 968 errno = saveerrno; 969 if (lclptr == NULL) { 970 __settzname(); /* all we can do */ 971 return; 972 } 973 } 974 #endif /* defined ALL_STATE */ 975 if (__tzload((char *) NULL, lclptr) != 0) 976 __gmtload(lclptr); 977 __settzname(); 978 } 979 980 #ifndef __LIBC12_SOURCE__ 981 #ifndef STD_INSPIRED 982 /* 983 ** A non-static declaration of tzsetwall in a system header file 984 ** may cause a warning about this upcoming static declaration... 985 */ 986 static 987 #endif /* !defined STD_INSPIRED */ 988 void 989 tzsetwall P((void)) 990 { 991 rwlock_wrlock(&__lcl_lock); 992 __tzsetwall_unlocked(); 993 rwlock_unlock(&__lcl_lock); 994 } 995 #endif 996 997 static void 998 __tzset_unlocked P((void)) 999 { 1000 register const char * name; 1001 int saveerrno; 1002 1003 saveerrno = errno; 1004 name = getenv("TZ"); 1005 errno = saveerrno; 1006 if (name == NULL) { 1007 __tzsetwall_unlocked(); 1008 return; 1009 } 1010 1011 if (__lcl_is_set > 0 && strcmp(__lcl_TZname, name) == 0) 1012 return; 1013 __lcl_is_set = strlen(name) < sizeof __lcl_TZname; 1014 if (__lcl_is_set) 1015 (void)strlcpy(__lcl_TZname, name, sizeof(__lcl_TZname)); 1016 1017 #ifdef ALL_STATE 1018 if (lclptr == NULL) { 1019 saveerrno = errno; 1020 lclptr = (struct state *) malloc(sizeof *lclptr); 1021 errno = saveerrno; 1022 if (lclptr == NULL) { 1023 __settzname(); /* all we can do */ 1024 return; 1025 } 1026 } 1027 #endif /* defined ALL_STATE */ 1028 if (*name == '\0') { 1029 /* 1030 ** User wants it fast rather than right. 1031 */ 1032 lclptr->leapcnt = 0; /* so, we're off a little */ 1033 lclptr->timecnt = 0; 1034 lclptr->typecnt = 0; 1035 lclptr->ttis[0].tt_isdst = 0; 1036 lclptr->ttis[0].tt_gmtoff = 0; 1037 lclptr->ttis[0].tt_abbrind = 0; 1038 (void)strlcpy(lclptr->chars, gmt, sizeof(lclptr->chars)); 1039 } else if (__tzload(name, lclptr) != 0) 1040 if (name[0] == ':' || __tzparse(name, lclptr, FALSE) != 0) 1041 (void) __gmtload(lclptr); 1042 __settzname(); 1043 } 1044 1045 #ifndef __LIBC12_SOURCE__ 1046 void 1047 tzset P((void)) 1048 { 1049 rwlock_wrlock(&__lcl_lock); 1050 __tzset_unlocked(); 1051 rwlock_unlock(&__lcl_lock); 1052 } 1053 #endif 1054 1055 /* 1056 ** The easy way to behave "as if no library function calls" localtime 1057 ** is to not call it--so we drop its guts into "localsub", which can be 1058 ** freely called. (And no, the PANS doesn't require the above behavior-- 1059 ** but it *is* desirable.) 1060 ** 1061 ** The unused offset argument is for the benefit of mktime variants. 1062 */ 1063 1064 /*ARGSUSED*/ 1065 static void 1066 localsub(timep, offset, tmp) 1067 const time_t * const timep; 1068 const long offset; 1069 struct tm * const tmp; 1070 { 1071 register struct state * sp; 1072 register const struct ttinfo * ttisp; 1073 register int i; 1074 const time_t t = *timep; 1075 1076 sp = lclptr; 1077 #ifdef ALL_STATE 1078 if (sp == NULL) { 1079 gmtsub(timep, offset, tmp); 1080 return; 1081 } 1082 #endif /* defined ALL_STATE */ 1083 if (sp->timecnt == 0 || t < sp->ats[0]) { 1084 i = 0; 1085 while (sp->ttis[i].tt_isdst) 1086 if (++i >= sp->typecnt) { 1087 i = 0; 1088 break; 1089 } 1090 } else { 1091 for (i = 1; i < sp->timecnt; ++i) 1092 if (t < sp->ats[i]) 1093 break; 1094 i = sp->types[i - 1]; 1095 } 1096 ttisp = &sp->ttis[i]; 1097 /* 1098 ** To get (wrong) behavior that's compatible with System V Release 2.0 1099 ** you'd replace the statement below with 1100 ** t += ttisp->tt_gmtoff; 1101 ** timesub(&t, 0L, sp, tmp); 1102 */ 1103 timesub(&t, ttisp->tt_gmtoff, sp, tmp); 1104 tmp->tm_isdst = ttisp->tt_isdst; 1105 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; 1106 #ifdef TM_ZONE 1107 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; 1108 #endif /* defined TM_ZONE */ 1109 } 1110 1111 struct tm * 1112 localtime(timep) 1113 const time_t * const timep; 1114 { 1115 rwlock_wrlock(&__lcl_lock); 1116 __tzset_unlocked(); 1117 localsub(timep, 0L, &tm); 1118 rwlock_unlock(&__lcl_lock); 1119 return &tm; 1120 } 1121 1122 /* 1123 ** Re-entrant version of localtime. 1124 */ 1125 1126 struct tm * 1127 localtime_r(timep, tmp) 1128 const time_t * const timep; 1129 struct tm * tmp; 1130 { 1131 rwlock_rdlock(&__lcl_lock); 1132 __tzset_unlocked(); 1133 localsub(timep, 0L, tmp); 1134 rwlock_unlock(&__lcl_lock); 1135 return tmp; 1136 } 1137 1138 /* 1139 ** gmtsub is to gmtime as localsub is to localtime. 1140 */ 1141 1142 static void 1143 gmtsub(timep, offset, tmp) 1144 const time_t * const timep; 1145 const long offset; 1146 struct tm * const tmp; 1147 { 1148 #ifdef _REENTRANT 1149 static mutex_t gmt_mutex = MUTEX_INITIALIZER; 1150 #endif 1151 1152 mutex_lock(&gmt_mutex); 1153 if (!__gmt_is_set) { 1154 #ifdef ALL_STATE 1155 int saveerrno; 1156 #endif 1157 __gmt_is_set = TRUE; 1158 #ifdef ALL_STATE 1159 saveerrno = errno; 1160 gmtptr = (struct state *) malloc(sizeof *gmtptr); 1161 errno = saveerrno; 1162 if (gmtptr != NULL) 1163 #endif /* defined ALL_STATE */ 1164 __gmtload(gmtptr); 1165 } 1166 mutex_unlock(&gmt_mutex); 1167 timesub(timep, offset, gmtptr, tmp); 1168 #ifdef TM_ZONE 1169 /* 1170 ** Could get fancy here and deliver something such as 1171 ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero, 1172 ** but this is no time for a treasure hunt. 1173 */ 1174 if (offset != 0) 1175 tmp->TM_ZONE = (__aconst char *)__UNCONST(wildabbr); 1176 else { 1177 #ifdef ALL_STATE 1178 if (gmtptr == NULL) 1179 tmp->TM_ZONE = (__aconst char *)__UNCONST(gmt); 1180 else tmp->TM_ZONE = gmtptr->chars; 1181 #endif /* defined ALL_STATE */ 1182 #ifndef ALL_STATE 1183 tmp->TM_ZONE = gmtptr->chars; 1184 #endif /* State Farm */ 1185 } 1186 #endif /* defined TM_ZONE */ 1187 } 1188 1189 struct tm * 1190 gmtime(timep) 1191 const time_t * const timep; 1192 { 1193 gmtsub(timep, 0L, &tm); 1194 return &tm; 1195 } 1196 1197 /* 1198 ** Re-entrant version of gmtime. 1199 */ 1200 1201 struct tm * 1202 gmtime_r(timep, tmp) 1203 const time_t * const timep; 1204 struct tm * tmp; 1205 { 1206 gmtsub(timep, 0L, tmp); 1207 return tmp; 1208 } 1209 1210 #ifdef STD_INSPIRED 1211 1212 struct tm * 1213 offtime(timep, offset) 1214 const time_t * const timep; 1215 const long offset; 1216 { 1217 gmtsub(timep, offset, &tm); 1218 return &tm; 1219 } 1220 1221 #endif /* defined STD_INSPIRED */ 1222 1223 static void 1224 timesub(timep, offset, sp, tmp) 1225 const time_t * const timep; 1226 const long offset; 1227 register const struct state * const sp; 1228 register struct tm * const tmp; 1229 { 1230 register const struct lsinfo * lp; 1231 register time_t days; 1232 register time_t rem; 1233 register int y; 1234 register int yleap; 1235 register const int * ip; 1236 register long corr; 1237 register int hit; 1238 register int i; 1239 1240 corr = 0; 1241 hit = 0; 1242 #ifdef ALL_STATE 1243 i = (sp == NULL) ? 0 : sp->leapcnt; 1244 #endif /* defined ALL_STATE */ 1245 #ifndef ALL_STATE 1246 i = sp->leapcnt; 1247 #endif /* State Farm */ 1248 while (--i >= 0) { 1249 lp = &sp->lsis[i]; 1250 if (*timep >= lp->ls_trans) { 1251 if (*timep == lp->ls_trans) { 1252 hit = ((i == 0 && lp->ls_corr > 0) || 1253 lp->ls_corr > sp->lsis[i - 1].ls_corr); 1254 if (hit) 1255 while (i > 0 && 1256 sp->lsis[i].ls_trans == 1257 sp->lsis[i - 1].ls_trans + 1 && 1258 sp->lsis[i].ls_corr == 1259 sp->lsis[i - 1].ls_corr + 1) { 1260 ++hit; 1261 --i; 1262 } 1263 } 1264 corr = lp->ls_corr; 1265 break; 1266 } 1267 } 1268 days = *timep / SECSPERDAY; 1269 rem = *timep % SECSPERDAY; 1270 #ifdef mc68k 1271 if (*timep == 0x80000000) { 1272 /* 1273 ** A 3B1 muffs the division on the most negative number. 1274 */ 1275 days = -24855; 1276 rem = -11648; 1277 } 1278 #endif /* defined mc68k */ 1279 rem += (offset - corr); 1280 while (rem < 0) { 1281 rem += SECSPERDAY; 1282 --days; 1283 } 1284 while (rem >= SECSPERDAY) { 1285 rem -= SECSPERDAY; 1286 ++days; 1287 } 1288 tmp->tm_hour = (int) (rem / SECSPERHOUR); 1289 rem = rem % SECSPERHOUR; 1290 tmp->tm_min = (int) (rem / SECSPERMIN); 1291 /* 1292 ** A positive leap second requires a special 1293 ** representation. This uses "... ??:59:60" et seq. 1294 */ 1295 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; 1296 tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK); 1297 if (tmp->tm_wday < 0) 1298 tmp->tm_wday += DAYSPERWEEK; 1299 y = EPOCH_YEAR; 1300 #define LEAPS_THRU_END_OF(y) ((y) / 4 - (y) / 100 + (y) / 400) 1301 while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) { 1302 register int newy; 1303 1304 newy = (int)(y + days / DAYSPERNYEAR); 1305 if (days < 0) 1306 --newy; 1307 days -= (newy - y) * DAYSPERNYEAR + 1308 LEAPS_THRU_END_OF(newy - 1) - 1309 LEAPS_THRU_END_OF(y - 1); 1310 y = newy; 1311 } 1312 tmp->tm_year = y - TM_YEAR_BASE; 1313 tmp->tm_yday = (int) days; 1314 ip = mon_lengths[yleap]; 1315 for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon)) 1316 days = days - (long) ip[tmp->tm_mon]; 1317 tmp->tm_mday = (int) (days + 1); 1318 tmp->tm_isdst = 0; 1319 #ifdef TM_GMTOFF 1320 tmp->TM_GMTOFF = offset; 1321 #endif /* defined TM_GMTOFF */ 1322 } 1323 1324 char * 1325 ctime(timep) 1326 const time_t * const timep; 1327 { 1328 /* 1329 ** Section 4.12.3.2 of X3.159-1989 requires that 1330 ** The ctime function converts the calendar time pointed to by timer 1331 ** to local time in the form of a string. It is equivalent to 1332 ** asctime(localtime(timer)) 1333 */ 1334 return asctime(localtime(timep)); 1335 } 1336 1337 char * 1338 ctime_r(timep, buf) 1339 const time_t * const timep; 1340 char * buf; 1341 { 1342 struct tm tmp; 1343 1344 return asctime_r(localtime_r(timep, &tmp), buf); 1345 } 1346 1347 /* 1348 ** Adapted from code provided by Robert Elz, who writes: 1349 ** The "best" way to do mktime I think is based on an idea of Bob 1350 ** Kridle's (so its said...) from a long time ago. 1351 ** [kridle (at) xinet.com as of 1996-01-16.] 1352 ** It does a binary search of the time_t space. Since time_t's are 1353 ** just 32 bits, its a max of 32 iterations (even at 64 bits it 1354 ** would still be very reasonable). 1355 */ 1356 1357 #ifndef WRONG 1358 #define WRONG (-1) 1359 #endif /* !defined WRONG */ 1360 1361 /* 1362 ** Simplified normalize logic courtesy Paul Eggert (eggert (at) twinsun.com). 1363 */ 1364 1365 static int 1366 increment_overflow(number, delta) 1367 int * number; 1368 int delta; 1369 { 1370 int number0; 1371 1372 number0 = *number; 1373 *number += delta; 1374 return (*number < number0) != (delta < 0); 1375 } 1376 1377 static int 1378 normalize_overflow(tensptr, unitsptr, base) 1379 int * const tensptr; 1380 int * const unitsptr; 1381 const int base; 1382 { 1383 register int tensdelta; 1384 1385 tensdelta = (*unitsptr >= 0) ? 1386 (*unitsptr / base) : 1387 (-1 - (-1 - *unitsptr) / base); 1388 *unitsptr -= tensdelta * base; 1389 return increment_overflow(tensptr, tensdelta); 1390 } 1391 1392 static int 1393 tmcomp(atmp, btmp) 1394 register const struct tm * const atmp; 1395 register const struct tm * const btmp; 1396 { 1397 register int result; 1398 1399 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && 1400 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && 1401 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && 1402 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && 1403 (result = (atmp->tm_min - btmp->tm_min)) == 0) 1404 result = atmp->tm_sec - btmp->tm_sec; 1405 return result; 1406 } 1407 1408 static time_t 1409 time2sub(tmp, funcp, offset, okayp, do_norm_secs) 1410 struct tm * const tmp; 1411 void (* const funcp) P((const time_t*, long, struct tm*)); 1412 const long offset; 1413 int * const okayp; 1414 const int do_norm_secs; 1415 { 1416 register const struct state * sp; 1417 register int dir; 1418 register int bits; 1419 register int i, j ; 1420 register int saved_seconds; 1421 time_t newt; 1422 time_t t; 1423 struct tm yourtm, mytm; 1424 1425 *okayp = FALSE; 1426 yourtm = *tmp; 1427 if (do_norm_secs) { 1428 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec, 1429 SECSPERMIN)) 1430 return WRONG; 1431 } 1432 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) 1433 return WRONG; 1434 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) 1435 return WRONG; 1436 if (normalize_overflow(&yourtm.tm_year, &yourtm.tm_mon, MONSPERYEAR)) 1437 return WRONG; 1438 /* 1439 ** Turn yourtm.tm_year into an actual year number for now. 1440 ** It is converted back to an offset from TM_YEAR_BASE later. 1441 */ 1442 if (increment_overflow(&yourtm.tm_year, TM_YEAR_BASE)) 1443 return WRONG; 1444 while (yourtm.tm_mday <= 0) { 1445 if (increment_overflow(&yourtm.tm_year, -1)) 1446 return WRONG; 1447 i = yourtm.tm_year + (1 < yourtm.tm_mon); 1448 yourtm.tm_mday += year_lengths[isleap(i)]; 1449 } 1450 while (yourtm.tm_mday > DAYSPERLYEAR) { 1451 i = yourtm.tm_year + (1 < yourtm.tm_mon); 1452 yourtm.tm_mday -= year_lengths[isleap(i)]; 1453 if (increment_overflow(&yourtm.tm_year, 1)) 1454 return WRONG; 1455 } 1456 for ( ; ; ) { 1457 i = mon_lengths[isleap(yourtm.tm_year)][yourtm.tm_mon]; 1458 if (yourtm.tm_mday <= i) 1459 break; 1460 yourtm.tm_mday -= i; 1461 if (++yourtm.tm_mon >= MONSPERYEAR) { 1462 yourtm.tm_mon = 0; 1463 if (increment_overflow(&yourtm.tm_year, 1)) 1464 return WRONG; 1465 } 1466 } 1467 if (increment_overflow(&yourtm.tm_year, -TM_YEAR_BASE)) 1468 return WRONG; 1469 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN) 1470 saved_seconds = 0; 1471 else if (yourtm.tm_year + TM_YEAR_BASE < EPOCH_YEAR) { 1472 /* 1473 ** We can't set tm_sec to 0, because that might push the 1474 ** time below the minimum representable time. 1475 ** Set tm_sec to 59 instead. 1476 ** This assumes that the minimum representable time is 1477 ** not in the same minute that a leap second was deleted from, 1478 ** which is a safer assumption than using 58 would be. 1479 */ 1480 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) 1481 return WRONG; 1482 saved_seconds = yourtm.tm_sec; 1483 yourtm.tm_sec = SECSPERMIN - 1; 1484 } else { 1485 saved_seconds = yourtm.tm_sec; 1486 yourtm.tm_sec = 0; 1487 } 1488 /* 1489 ** Divide the search space in half 1490 ** (this works whether time_t is signed or unsigned). 1491 */ 1492 bits = TYPE_BIT(time_t) - 1; 1493 /* 1494 ** If time_t is signed, then 0 is just above the median, 1495 ** assuming two's complement arithmetic. 1496 ** If time_t is unsigned, then (1 << bits) is just above the median. 1497 */ 1498 /*CONSTCOND*/ 1499 t = TYPE_SIGNED(time_t) ? 0 : (((time_t) 1) << bits); 1500 for ( ; ; ) { 1501 (*funcp)(&t, offset, &mytm); 1502 dir = tmcomp(&mytm, &yourtm); 1503 if (dir != 0) { 1504 if (bits-- < 0) 1505 return WRONG; 1506 if (bits < 0) 1507 --t; /* may be needed if new t is minimal */ 1508 else if (dir > 0) 1509 t -= ((time_t) 1) << bits; 1510 else t += ((time_t) 1) << bits; 1511 continue; 1512 } 1513 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) 1514 break; 1515 /* 1516 ** Right time, wrong type. 1517 ** Hunt for right time, right type. 1518 ** It's okay to guess wrong since the guess 1519 ** gets checked. 1520 */ 1521 /* 1522 ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. 1523 */ 1524 sp = (const struct state *) 1525 (((void *) funcp == (void *) localsub) ? 1526 lclptr : gmtptr); 1527 #ifdef ALL_STATE 1528 if (sp == NULL) 1529 return WRONG; 1530 #endif /* defined ALL_STATE */ 1531 for (i = sp->typecnt - 1; i >= 0; --i) { 1532 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) 1533 continue; 1534 for (j = sp->typecnt - 1; j >= 0; --j) { 1535 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) 1536 continue; 1537 newt = t + sp->ttis[j].tt_gmtoff - 1538 sp->ttis[i].tt_gmtoff; 1539 (*funcp)(&newt, offset, &mytm); 1540 if (tmcomp(&mytm, &yourtm) != 0) 1541 continue; 1542 if (mytm.tm_isdst != yourtm.tm_isdst) 1543 continue; 1544 /* 1545 ** We have a match. 1546 */ 1547 t = newt; 1548 goto label; 1549 } 1550 } 1551 return WRONG; 1552 } 1553 label: 1554 newt = t + saved_seconds; 1555 if ((newt < t) != (saved_seconds < 0)) 1556 return WRONG; 1557 t = newt; 1558 (*funcp)(&t, offset, tmp); 1559 *okayp = TRUE; 1560 return t; 1561 } 1562 1563 static time_t 1564 time2(tmp, funcp, offset, okayp) 1565 struct tm * const tmp; 1566 void (* const funcp) P((const time_t*, long, struct tm*)); 1567 const long offset; 1568 int * const okayp; 1569 { 1570 time_t t; 1571 1572 /* 1573 ** First try without normalization of seconds 1574 ** (in case tm_sec contains a value associated with a leap second). 1575 ** If that fails, try with normalization of seconds. 1576 */ 1577 t = time2sub(tmp, funcp, offset, okayp, FALSE); 1578 return *okayp ? t : time2sub(tmp, funcp, offset, okayp, TRUE); 1579 } 1580 1581 static time_t 1582 time1(tmp, funcp, offset) 1583 struct tm * const tmp; 1584 void (* const funcp) P((const time_t *, long, struct tm *)); 1585 const long offset; 1586 { 1587 register time_t t; 1588 register const struct state * sp; 1589 register int samei, otheri; 1590 register int sameind, otherind; 1591 register int i; 1592 register int nseen; 1593 int seen[TZ_MAX_TYPES]; 1594 int types[TZ_MAX_TYPES]; 1595 int okay; 1596 1597 if (tmp->tm_isdst > 1) 1598 tmp->tm_isdst = 1; 1599 t = time2(tmp, funcp, offset, &okay); 1600 #ifdef PCTS 1601 /* 1602 ** PCTS code courtesy Grant Sullivan (grant (at) osf.org). 1603 */ 1604 if (okay) 1605 return t; 1606 if (tmp->tm_isdst < 0) 1607 tmp->tm_isdst = 0; /* reset to std and try again */ 1608 #endif /* defined PCTS */ 1609 #ifndef PCTS 1610 if (okay || tmp->tm_isdst < 0) 1611 return t; 1612 #endif /* !defined PCTS */ 1613 /* 1614 ** We're supposed to assume that somebody took a time of one type 1615 ** and did some math on it that yielded a "struct tm" that's bad. 1616 ** We try to divine the type they started from and adjust to the 1617 ** type they need. 1618 */ 1619 /* 1620 ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. 1621 */ 1622 sp = (const struct state *) (((void *) funcp == (void *) localsub) ? 1623 lclptr : gmtptr); 1624 #ifdef ALL_STATE 1625 if (sp == NULL) 1626 return WRONG; 1627 #endif /* defined ALL_STATE */ 1628 for (i = 0; i < sp->typecnt; ++i) 1629 seen[i] = FALSE; 1630 nseen = 0; 1631 for (i = sp->timecnt - 1; i >= 0; --i) 1632 if (!seen[sp->types[i]]) { 1633 seen[sp->types[i]] = TRUE; 1634 types[nseen++] = sp->types[i]; 1635 } 1636 for (sameind = 0; sameind < nseen; ++sameind) { 1637 samei = types[sameind]; 1638 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) 1639 continue; 1640 for (otherind = 0; otherind < nseen; ++otherind) { 1641 otheri = types[otherind]; 1642 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) 1643 continue; 1644 tmp->tm_sec += (int)(sp->ttis[otheri].tt_gmtoff - 1645 sp->ttis[samei].tt_gmtoff); 1646 tmp->tm_isdst = !tmp->tm_isdst; 1647 t = time2(tmp, funcp, offset, &okay); 1648 if (okay) 1649 return t; 1650 tmp->tm_sec -= (int)(sp->ttis[otheri].tt_gmtoff - 1651 sp->ttis[samei].tt_gmtoff); 1652 tmp->tm_isdst = !tmp->tm_isdst; 1653 } 1654 } 1655 return WRONG; 1656 } 1657 1658 time_t 1659 mktime(tmp) 1660 struct tm * const tmp; 1661 { 1662 time_t result; 1663 1664 rwlock_wrlock(&__lcl_lock); 1665 __tzset_unlocked(); 1666 result = time1(tmp, localsub, 0L); 1667 rwlock_unlock(&__lcl_lock); 1668 return (result); 1669 } 1670 1671 #ifdef STD_INSPIRED 1672 1673 time_t 1674 timelocal(tmp) 1675 struct tm * const tmp; 1676 { 1677 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 1678 return mktime(tmp); 1679 } 1680 1681 time_t 1682 timegm(tmp) 1683 struct tm * const tmp; 1684 { 1685 tmp->tm_isdst = 0; 1686 return time1(tmp, gmtsub, 0L); 1687 } 1688 1689 time_t 1690 timeoff(tmp, offset) 1691 struct tm * const tmp; 1692 const long offset; 1693 { 1694 tmp->tm_isdst = 0; 1695 return time1(tmp, gmtsub, offset); 1696 } 1697 1698 #endif /* defined STD_INSPIRED */ 1699 1700 #ifdef CMUCS 1701 1702 /* 1703 ** The following is supplied for compatibility with 1704 ** previous versions of the CMUCS runtime library. 1705 */ 1706 1707 long 1708 gtime(tmp) 1709 struct tm * const tmp; 1710 { 1711 const time_t t = mktime(tmp); 1712 1713 if (t == WRONG) 1714 return -1; 1715 return t; 1716 } 1717 1718 #endif /* defined CMUCS */ 1719 1720 /* 1721 ** XXX--is the below the right way to conditionalize?? 1722 */ 1723 1724 #ifdef STD_INSPIRED 1725 1726 /* 1727 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 1728 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which 1729 ** is not the case if we are accounting for leap seconds. 1730 ** So, we provide the following conversion routines for use 1731 ** when exchanging timestamps with POSIX conforming systems. 1732 */ 1733 1734 static long 1735 leapcorr(timep) 1736 time_t * timep; 1737 { 1738 register struct state * sp; 1739 register struct lsinfo * lp; 1740 register int i; 1741 1742 sp = lclptr; 1743 i = sp->leapcnt; 1744 while (--i >= 0) { 1745 lp = &sp->lsis[i]; 1746 if (*timep >= lp->ls_trans) 1747 return lp->ls_corr; 1748 } 1749 return 0; 1750 } 1751 1752 time_t 1753 time2posix(t) 1754 time_t t; 1755 { 1756 time_t result; 1757 1758 rwlock_wrlock(&__lcl_lock); 1759 __tzset_unlocked(); 1760 result = t - leapcorr(&t); 1761 rwlock_unlock(&__lcl_lock); 1762 return (result); 1763 } 1764 1765 time_t 1766 posix2time(t) 1767 time_t t; 1768 { 1769 time_t x; 1770 time_t y; 1771 1772 rwlock_wrlock(&__lcl_lock); 1773 __tzset_unlocked(); 1774 /* 1775 ** For a positive leap second hit, the result 1776 ** is not unique. For a negative leap second 1777 ** hit, the corresponding time doesn't exist, 1778 ** so we return an adjacent second. 1779 */ 1780 x = t + leapcorr(&t); 1781 y = x - leapcorr(&x); 1782 if (y < t) { 1783 do { 1784 x++; 1785 y = x - leapcorr(&x); 1786 } while (y < t); 1787 if (t != y) { 1788 rwlock_unlock(&__lcl_lock); 1789 return x - 1; 1790 } 1791 } else if (y > t) { 1792 do { 1793 --x; 1794 y = x - leapcorr(&x); 1795 } while (y > t); 1796 if (t != y) { 1797 rwlock_unlock(&__lcl_lock); 1798 return x + 1; 1799 } 1800 } 1801 rwlock_unlock(&__lcl_lock); 1802 return x; 1803 } 1804 1805 #endif /* defined STD_INSPIRED */ 1806
Indexes created Thu Oct 02 10:09:58 GMT 2025