localtime.c revision 1.35
1 /* $NetBSD: localtime.c,v 1.35 2003/12/20 00:12:05 kleink 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 1.35 2003/12/20 00:12:05 kleink 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 #ifdef __weak_alias 32 __weak_alias(ctime_r,_ctime_r) 33 __weak_alias(daylight,_daylight) 34 __weak_alias(gmtime_r,_gmtime_r) 35 __weak_alias(localtime_r,_localtime_r) 36 __weak_alias(offtime,_offtime) 37 __weak_alias(posix2time,_posix2time) 38 __weak_alias(time2posix,_time2posix) 39 __weak_alias(timegm,_timegm) 40 __weak_alias(timelocal,_timelocal) 41 __weak_alias(timeoff,_timeoff) 42 __weak_alias(tzname,_tzname) 43 __weak_alias(tzset,_tzset) 44 __weak_alias(tzsetwall,_tzsetwall) 45 #endif 46 47 /* 48 ** SunOS 4.1.1 headers lack O_BINARY. 49 */ 50 51 #ifdef O_BINARY 52 #define OPEN_MODE (O_RDONLY | O_BINARY) 53 #endif /* defined O_BINARY */ 54 #ifndef O_BINARY 55 #define OPEN_MODE O_RDONLY 56 #endif /* !defined O_BINARY */ 57 58 #ifndef WILDABBR 59 /* 60 ** Someone might make incorrect use of a time zone abbreviation: 61 ** 1. They might reference tzname[0] before calling tzset (explicitly 62 ** or implicitly). 63 ** 2. They might reference tzname[1] before calling tzset (explicitly 64 ** or implicitly). 65 ** 3. They might reference tzname[1] after setting to a time zone 66 ** in which Daylight Saving Time is never observed. 67 ** 4. They might reference tzname[0] after setting to a time zone 68 ** in which Standard Time is never observed. 69 ** 5. They might reference tm.TM_ZONE after calling offtime. 70 ** What's best to do in the above cases is open to debate; 71 ** for now, we just set things up so that in any of the five cases 72 ** WILDABBR is used. Another possibility: initialize tzname[0] to the 73 ** string "tzname[0] used before set", and similarly for the other cases. 74 ** And another: initialize tzname[0] to "ERA", with an explanation in the 75 ** manual page of what this "time zone abbreviation" means (doing this so 76 ** that tzname[0] has the "normal" length of three characters). 77 */ 78 #define WILDABBR " " 79 #endif /* !defined WILDABBR */ 80 81 static const char wildabbr[] = "WILDABBR"; 82 83 static const char gmt[] = "GMT"; 84 85 /* 86 ** The DST rules to use if TZ has no rules and we can't load TZDEFRULES. 87 ** We default to US rules as of 1999-08-17. 88 ** POSIX 1003.1 section 8.1.1 says that the default DST rules are 89 ** implementation dependent; for historical reasons, US rules are a 90 ** common default. 91 */ 92 #ifndef TZDEFRULESTRING 93 #define TZDEFRULESTRING ",M4.1.0,M10.5.0" 94 #endif /* !defined TZDEFDST */ 95 96 struct ttinfo { /* time type information */ 97 long tt_gmtoff; /* UTC offset in seconds */ 98 int tt_isdst; /* used to set tm_isdst */ 99 int tt_abbrind; /* abbreviation list index */ 100 int tt_ttisstd; /* TRUE if transition is std time */ 101 int tt_ttisgmt; /* TRUE if transition is UTC */ 102 }; 103 104 struct lsinfo { /* leap second information */ 105 time_t ls_trans; /* transition time */ 106 long ls_corr; /* correction to apply */ 107 }; 108 109 #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) 110 111 #ifdef TZNAME_MAX 112 #define MY_TZNAME_MAX TZNAME_MAX 113 #endif /* defined TZNAME_MAX */ 114 #ifndef TZNAME_MAX 115 #define MY_TZNAME_MAX 255 116 #endif /* !defined TZNAME_MAX */ 117 118 struct state { 119 int leapcnt; 120 int timecnt; 121 int typecnt; 122 int charcnt; 123 time_t ats[TZ_MAX_TIMES]; 124 unsigned char types[TZ_MAX_TIMES]; 125 struct ttinfo ttis[TZ_MAX_TYPES]; 126 char chars[/* LINTED constant */BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt), 127 (2 * (MY_TZNAME_MAX + 1)))]; 128 struct lsinfo lsis[TZ_MAX_LEAPS]; 129 }; 130 131 struct rule { 132 int r_type; /* type of rule--see below */ 133 int r_day; /* day number of rule */ 134 int r_week; /* week number of rule */ 135 int r_mon; /* month number of rule */ 136 long r_time; /* transition time of rule */ 137 }; 138 139 #define JULIAN_DAY 0 /* Jn - Julian day */ 140 #define DAY_OF_YEAR 1 /* n - day of year */ 141 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */ 142 143 /* 144 ** Prototypes for static functions. 145 */ 146 147 static long detzcode P((const char * codep)); 148 static const char * getzname P((const char * strp)); 149 static const char * getnum P((const char * strp, int * nump, int min, 150 int max)); 151 static const char * getsecs P((const char * strp, long * secsp)); 152 static const char * getoffset P((const char * strp, long * offsetp)); 153 static const char * getrule P((const char * strp, struct rule * rulep)); 154 static void gmtload P((struct state * sp)); 155 static void gmtsub P((const time_t * timep, long offset, 156 struct tm * tmp)); 157 static void localsub P((const time_t * timep, long offset, 158 struct tm * tmp)); 159 static int increment_overflow P((int * number, int delta)); 160 static int normalize_overflow P((int * tensptr, int * unitsptr, 161 int base)); 162 static void settzname P((void)); 163 static time_t time1 P((struct tm * tmp, 164 void(*funcp) P((const time_t *, 165 long, struct tm *)), 166 long offset)); 167 static time_t time2 P((struct tm *tmp, 168 void(*funcp) P((const time_t *, 169 long, struct tm*)), 170 long offset, int * okayp)); 171 static time_t time2sub P((struct tm *tmp, 172 void(*funcp) P((const time_t *, 173 long, struct tm*)), 174 long offset, int * okayp, int do_norm_secs)); 175 static void timesub P((const time_t * timep, long offset, 176 const struct state * sp, struct tm * tmp)); 177 static int tmcomp P((const struct tm * atmp, 178 const struct tm * btmp)); 179 static time_t transtime P((time_t janfirst, int year, 180 const struct rule * rulep, long offset)); 181 static int tzload P((const char * name, struct state * sp)); 182 static int tzparse P((const char * name, struct state * sp, 183 int lastditch)); 184 static void tzset_unlocked P((void)); 185 static void tzsetwall_unlocked P((void)); 186 #ifdef STD_INSPIRED 187 static long leapcorr P((time_t * timep)); 188 #endif 189 190 #ifdef ALL_STATE 191 static struct state * lclptr; 192 static struct state * gmtptr; 193 #endif /* defined ALL_STATE */ 194 195 #ifndef ALL_STATE 196 static struct state lclmem; 197 static struct state gmtmem; 198 #define lclptr (&lclmem) 199 #define gmtptr (&gmtmem) 200 #endif /* State Farm */ 201 202 #ifndef TZ_STRLEN_MAX 203 #define TZ_STRLEN_MAX 255 204 #endif /* !defined TZ_STRLEN_MAX */ 205 206 static char lcl_TZname[TZ_STRLEN_MAX + 1]; 207 static int lcl_is_set; 208 static int gmt_is_set; 209 210 __aconst char * tzname[2] = { 211 /* LINTED const castaway */ 212 (__aconst char *)wildabbr, 213 /* LINTED const castaway */ 214 (__aconst char *)wildabbr 215 }; 216 217 #ifdef _REENTRANT 218 static rwlock_t lcl_lock = RWLOCK_INITIALIZER; 219 #endif 220 221 /* 222 ** Section 4.12.3 of X3.159-1989 requires that 223 ** Except for the strftime function, these functions [asctime, 224 ** ctime, gmtime, localtime] return values in one of two static 225 ** objects: a broken-down time structure and an array of char. 226 ** Thanks to Paul Eggert (eggert (at) twinsun.com) for noting this. 227 */ 228 229 static struct tm tm; 230 231 #ifdef USG_COMPAT 232 long int timezone = 0; 233 int daylight = 0; 234 #endif /* defined USG_COMPAT */ 235 236 #ifdef ALTZONE 237 time_t altzone = 0; 238 #endif /* defined ALTZONE */ 239 240 static long 241 detzcode(codep) 242 const char * const codep; 243 { 244 register long result; 245 246 /* 247 ** The first character must be sign extended on systems with >32bit 248 ** longs. This was solved differently in the master tzcode sources 249 ** (the fix first appeared in tzcode95c.tar.gz). But I believe 250 ** that this implementation is superior. 251 */ 252 253 #define SIGN_EXTEND_CHAR(x) ((signed char) x) 254 255 result = (SIGN_EXTEND_CHAR(codep[0]) << 24) \ 256 | (codep[1] & 0xff) << 16 \ 257 | (codep[2] & 0xff) << 8 258 | (codep[3] & 0xff); 259 return result; 260 } 261 262 static void 263 settzname P((void)) 264 { 265 register struct state * const sp = lclptr; 266 register int i; 267 268 /* LINTED const castaway */ 269 tzname[0] = (__aconst char *)wildabbr; 270 /* LINTED const castaway */ 271 tzname[1] = (__aconst char *)wildabbr; 272 #ifdef USG_COMPAT 273 daylight = 0; 274 timezone = 0; 275 #endif /* defined USG_COMPAT */ 276 #ifdef ALTZONE 277 altzone = 0; 278 #endif /* defined ALTZONE */ 279 #ifdef ALL_STATE 280 if (sp == NULL) { 281 tzname[0] = tzname[1] = (__aconst char *)gmt; 282 return; 283 } 284 #endif /* defined ALL_STATE */ 285 for (i = 0; i < sp->typecnt; ++i) { 286 register const struct ttinfo * const ttisp = &sp->ttis[i]; 287 288 tzname[ttisp->tt_isdst] = 289 &sp->chars[ttisp->tt_abbrind]; 290 #ifdef USG_COMPAT 291 if (ttisp->tt_isdst) 292 daylight = 1; 293 if (i == 0 || !ttisp->tt_isdst) 294 timezone = -(ttisp->tt_gmtoff); 295 #endif /* defined USG_COMPAT */ 296 #ifdef ALTZONE 297 if (i == 0 || ttisp->tt_isdst) 298 altzone = -(ttisp->tt_gmtoff); 299 #endif /* defined ALTZONE */ 300 } 301 /* 302 ** And to get the latest zone names into tzname. . . 303 */ 304 for (i = 0; i < sp->timecnt; ++i) { 305 register const struct ttinfo * const ttisp = 306 &sp->ttis[ 307 sp->types[i]]; 308 309 tzname[ttisp->tt_isdst] = 310 &sp->chars[ttisp->tt_abbrind]; 311 } 312 } 313 314 static int 315 tzload(name, sp) 316 register const char * name; 317 register struct state * const sp; 318 { 319 register const char * p; 320 register int i; 321 register int fid; 322 323 if (name == NULL && (name = TZDEFAULT) == NULL) 324 return -1; 325 326 { 327 register int doaccess; 328 /* 329 ** Section 4.9.1 of the C standard says that 330 ** "FILENAME_MAX expands to an integral constant expression 331 ** that is the size needed for an array of char large enough 332 ** to hold the longest file name string that the implementation 333 ** guarantees can be opened." 334 */ 335 char fullname[FILENAME_MAX + 1]; 336 337 if (name[0] == ':') 338 ++name; 339 doaccess = name[0] == '/'; 340 if (!doaccess) { 341 if ((p = TZDIR) == NULL) 342 return -1; 343 if ((strlen(p) + strlen(name) + 1) >= sizeof fullname) 344 return -1; 345 (void) strcpy(fullname, p); /* XXX strcpy is safe */ 346 (void) strcat(fullname, "/"); /* XXX strcat is safe */ 347 (void) strcat(fullname, name); /* XXX strcat is safe */ 348 /* 349 ** Set doaccess if '.' (as in "../") shows up in name. 350 */ 351 if (strchr(name, '.') != NULL) 352 doaccess = TRUE; 353 name = fullname; 354 } 355 if (doaccess && access(name, R_OK) != 0) 356 return -1; 357 /* 358 * XXX potential security problem here if user of a set-id 359 * program has set TZ (which is passed in as name) here, 360 * and uses a race condition trick to defeat the access(2) 361 * above. 362 */ 363 if ((fid = open(name, OPEN_MODE)) == -1) 364 return -1; 365 } 366 { 367 struct tzhead * tzhp; 368 union { 369 struct tzhead tzhead; 370 char buf[sizeof *sp + sizeof *tzhp]; 371 } u; 372 int ttisstdcnt; 373 int ttisgmtcnt; 374 375 i = read(fid, u.buf, sizeof u.buf); 376 if (close(fid) != 0) 377 return -1; 378 ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt); 379 ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt); 380 sp->leapcnt = (int) detzcode(u.tzhead.tzh_leapcnt); 381 sp->timecnt = (int) detzcode(u.tzhead.tzh_timecnt); 382 sp->typecnt = (int) detzcode(u.tzhead.tzh_typecnt); 383 sp->charcnt = (int) detzcode(u.tzhead.tzh_charcnt); 384 p = u.tzhead.tzh_charcnt + sizeof u.tzhead.tzh_charcnt; 385 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || 386 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || 387 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || 388 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS || 389 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) || 390 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0)) 391 return -1; 392 if (i - (p - u.buf) < sp->timecnt * 4 + /* ats */ 393 sp->timecnt + /* types */ 394 sp->typecnt * (4 + 2) + /* ttinfos */ 395 sp->charcnt + /* chars */ 396 sp->leapcnt * (4 + 4) + /* lsinfos */ 397 ttisstdcnt + /* ttisstds */ 398 ttisgmtcnt) /* ttisgmts */ 399 return -1; 400 for (i = 0; i < sp->timecnt; ++i) { 401 sp->ats[i] = detzcode(p); 402 p += 4; 403 } 404 for (i = 0; i < sp->timecnt; ++i) { 405 sp->types[i] = (unsigned char) *p++; 406 if (sp->types[i] >= sp->typecnt) 407 return -1; 408 } 409 for (i = 0; i < sp->typecnt; ++i) { 410 register struct ttinfo * ttisp; 411 412 ttisp = &sp->ttis[i]; 413 ttisp->tt_gmtoff = detzcode(p); 414 p += 4; 415 ttisp->tt_isdst = (unsigned char) *p++; 416 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) 417 return -1; 418 ttisp->tt_abbrind = (unsigned char) *p++; 419 if (ttisp->tt_abbrind < 0 || 420 ttisp->tt_abbrind > sp->charcnt) 421 return -1; 422 } 423 for (i = 0; i < sp->charcnt; ++i) 424 sp->chars[i] = *p++; 425 sp->chars[i] = '\0'; /* ensure '\0' at end */ 426 for (i = 0; i < sp->leapcnt; ++i) { 427 register struct lsinfo * lsisp; 428 429 lsisp = &sp->lsis[i]; 430 lsisp->ls_trans = detzcode(p); 431 p += 4; 432 lsisp->ls_corr = detzcode(p); 433 p += 4; 434 } 435 for (i = 0; i < sp->typecnt; ++i) { 436 register struct ttinfo * ttisp; 437 438 ttisp = &sp->ttis[i]; 439 if (ttisstdcnt == 0) 440 ttisp->tt_ttisstd = FALSE; 441 else { 442 ttisp->tt_ttisstd = *p++; 443 if (ttisp->tt_ttisstd != TRUE && 444 ttisp->tt_ttisstd != FALSE) 445 return -1; 446 } 447 } 448 for (i = 0; i < sp->typecnt; ++i) { 449 register struct ttinfo * ttisp; 450 451 ttisp = &sp->ttis[i]; 452 if (ttisgmtcnt == 0) 453 ttisp->tt_ttisgmt = FALSE; 454 else { 455 ttisp->tt_ttisgmt = *p++; 456 if (ttisp->tt_ttisgmt != TRUE && 457 ttisp->tt_ttisgmt != FALSE) 458 return -1; 459 } 460 } 461 } 462 return 0; 463 } 464 465 static const int mon_lengths[2][MONSPERYEAR] = { 466 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 467 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } 468 }; 469 470 static const int year_lengths[2] = { 471 DAYSPERNYEAR, DAYSPERLYEAR 472 }; 473 474 /* 475 ** Given a pointer into a time zone string, scan until a character that is not 476 ** a valid character in a zone name is found. Return a pointer to that 477 ** character. 478 */ 479 480 static const char * 481 getzname(strp) 482 register const char * strp; 483 { 484 register char c; 485 486 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && 487 c != '+') 488 ++strp; 489 return strp; 490 } 491 492 /* 493 ** Given a pointer into a time zone string, extract a number from that string. 494 ** Check that the number is within a specified range; if it is not, return 495 ** NULL. 496 ** Otherwise, return a pointer to the first character not part of the number. 497 */ 498 499 static const char * 500 getnum(strp, nump, min, max) 501 register const char * strp; 502 int * const nump; 503 const int min; 504 const int max; 505 { 506 register char c; 507 register int num; 508 509 if (strp == NULL || !is_digit(c = *strp)) 510 return NULL; 511 num = 0; 512 do { 513 num = num * 10 + (c - '0'); 514 if (num > max) 515 return NULL; /* illegal value */ 516 c = *++strp; 517 } while (is_digit(c)); 518 if (num < min) 519 return NULL; /* illegal value */ 520 *nump = num; 521 return strp; 522 } 523 524 /* 525 ** Given a pointer into a time zone string, extract a number of seconds, 526 ** in hh[:mm[:ss]] form, from the string. 527 ** If any error occurs, return NULL. 528 ** Otherwise, return a pointer to the first character not part of the number 529 ** of seconds. 530 */ 531 532 static const char * 533 getsecs(strp, secsp) 534 register const char * strp; 535 long * const secsp; 536 { 537 int num; 538 539 /* 540 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like 541 ** "M10.4.6/26", which does not conform to Posix, 542 ** but which specifies the equivalent of 543 ** ``02:00 on the first Sunday on or after 23 Oct''. 544 */ 545 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); 546 if (strp == NULL) 547 return NULL; 548 *secsp = num * (long) SECSPERHOUR; 549 if (*strp == ':') { 550 ++strp; 551 strp = getnum(strp, &num, 0, MINSPERHOUR - 1); 552 if (strp == NULL) 553 return NULL; 554 *secsp += num * SECSPERMIN; 555 if (*strp == ':') { 556 ++strp; 557 /* `SECSPERMIN' allows for leap seconds. */ 558 strp = getnum(strp, &num, 0, SECSPERMIN); 559 if (strp == NULL) 560 return NULL; 561 *secsp += num; 562 } 563 } 564 return strp; 565 } 566 567 /* 568 ** Given a pointer into a time zone string, extract an offset, in 569 ** [+-]hh[:mm[:ss]] form, from the string. 570 ** If any error occurs, return NULL. 571 ** Otherwise, return a pointer to the first character not part of the time. 572 */ 573 574 static const char * 575 getoffset(strp, offsetp) 576 register const char * strp; 577 long * const offsetp; 578 { 579 register int neg = 0; 580 581 if (*strp == '-') { 582 neg = 1; 583 ++strp; 584 } else if (*strp == '+') 585 ++strp; 586 strp = getsecs(strp, offsetp); 587 if (strp == NULL) 588 return NULL; /* illegal time */ 589 if (neg) 590 *offsetp = -*offsetp; 591 return strp; 592 } 593 594 /* 595 ** Given a pointer into a time zone string, extract a rule in the form 596 ** date[/time]. See POSIX section 8 for the format of "date" and "time". 597 ** If a valid rule is not found, return NULL. 598 ** Otherwise, return a pointer to the first character not part of the rule. 599 */ 600 601 static const char * 602 getrule(strp, rulep) 603 const char * strp; 604 register struct rule * const rulep; 605 { 606 if (*strp == 'J') { 607 /* 608 ** Julian day. 609 */ 610 rulep->r_type = JULIAN_DAY; 611 ++strp; 612 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); 613 } else if (*strp == 'M') { 614 /* 615 ** Month, week, day. 616 */ 617 rulep->r_type = MONTH_NTH_DAY_OF_WEEK; 618 ++strp; 619 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); 620 if (strp == NULL) 621 return NULL; 622 if (*strp++ != '.') 623 return NULL; 624 strp = getnum(strp, &rulep->r_week, 1, 5); 625 if (strp == NULL) 626 return NULL; 627 if (*strp++ != '.') 628 return NULL; 629 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); 630 } else if (is_digit(*strp)) { 631 /* 632 ** Day of year. 633 */ 634 rulep->r_type = DAY_OF_YEAR; 635 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); 636 } else return NULL; /* invalid format */ 637 if (strp == NULL) 638 return NULL; 639 if (*strp == '/') { 640 /* 641 ** Time specified. 642 */ 643 ++strp; 644 strp = getsecs(strp, &rulep->r_time); 645 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ 646 return strp; 647 } 648 649 /* 650 ** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the 651 ** year, a rule, and the offset from UTC at the time that rule takes effect, 652 ** calculate the Epoch-relative time that rule takes effect. 653 */ 654 655 static time_t 656 transtime(janfirst, year, rulep, offset) 657 const time_t janfirst; 658 const int year; 659 register const struct rule * const rulep; 660 const long offset; 661 { 662 register int leapyear; 663 register time_t value; 664 register int i; 665 int d, m1, yy0, yy1, yy2, dow; 666 667 INITIALIZE(value); 668 leapyear = isleap(year); 669 switch (rulep->r_type) { 670 671 case JULIAN_DAY: 672 /* 673 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap 674 ** years. 675 ** In non-leap years, or if the day number is 59 or less, just 676 ** add SECSPERDAY times the day number-1 to the time of 677 ** January 1, midnight, to get the day. 678 */ 679 value = janfirst + (rulep->r_day - 1) * SECSPERDAY; 680 if (leapyear && rulep->r_day >= 60) 681 value += SECSPERDAY; 682 break; 683 684 case DAY_OF_YEAR: 685 /* 686 ** n - day of year. 687 ** Just add SECSPERDAY times the day number to the time of 688 ** January 1, midnight, to get the day. 689 */ 690 value = janfirst + rulep->r_day * SECSPERDAY; 691 break; 692 693 case MONTH_NTH_DAY_OF_WEEK: 694 /* 695 ** Mm.n.d - nth "dth day" of month m. 696 */ 697 value = janfirst; 698 for (i = 0; i < rulep->r_mon - 1; ++i) 699 value += mon_lengths[leapyear][i] * SECSPERDAY; 700 701 /* 702 ** Use Zeller's Congruence to get day-of-week of first day of 703 ** month. 704 */ 705 m1 = (rulep->r_mon + 9) % 12 + 1; 706 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; 707 yy1 = yy0 / 100; 708 yy2 = yy0 % 100; 709 dow = ((26 * m1 - 2) / 10 + 710 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; 711 if (dow < 0) 712 dow += DAYSPERWEEK; 713 714 /* 715 ** "dow" is the day-of-week of the first day of the month. Get 716 ** the day-of-month (zero-origin) of the first "dow" day of the 717 ** month. 718 */ 719 d = rulep->r_day - dow; 720 if (d < 0) 721 d += DAYSPERWEEK; 722 for (i = 1; i < rulep->r_week; ++i) { 723 if (d + DAYSPERWEEK >= 724 mon_lengths[leapyear][rulep->r_mon - 1]) 725 break; 726 d += DAYSPERWEEK; 727 } 728 729 /* 730 ** "d" is the day-of-month (zero-origin) of the day we want. 731 */ 732 value += d * SECSPERDAY; 733 break; 734 } 735 736 /* 737 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in 738 ** question. To get the Epoch-relative time of the specified local 739 ** time on that day, add the transition time and the current offset 740 ** from UTC. 741 */ 742 return value + rulep->r_time + offset; 743 } 744 745 /* 746 ** Given a POSIX section 8-style TZ string, fill in the rule tables as 747 ** appropriate. 748 */ 749 750 static int 751 tzparse(name, sp, lastditch) 752 const char * name; 753 register struct state * const sp; 754 const int lastditch; 755 { 756 const char * stdname; 757 const char * dstname; 758 size_t stdlen; 759 size_t dstlen; 760 long stdoffset; 761 long dstoffset; 762 register time_t * atp; 763 register unsigned char * typep; 764 register char * cp; 765 register int load_result; 766 767 INITIALIZE(dstname); 768 stdname = name; 769 if (lastditch) { 770 stdlen = strlen(name); /* length of standard zone name */ 771 name += stdlen; 772 if (stdlen >= sizeof sp->chars) 773 stdlen = (sizeof sp->chars) - 1; 774 stdoffset = 0; 775 } else { 776 name = getzname(name); 777 stdlen = name - stdname; 778 if (stdlen < 3) 779 return -1; 780 if (*name == '\0') 781 return -1; 782 name = getoffset(name, &stdoffset); 783 if (name == NULL) 784 return -1; 785 } 786 load_result = tzload(TZDEFRULES, sp); 787 if (load_result != 0) 788 sp->leapcnt = 0; /* so, we're off a little */ 789 if (*name != '\0') { 790 dstname = name; 791 name = getzname(name); 792 dstlen = name - dstname; /* length of DST zone name */ 793 if (dstlen < 3) 794 return -1; 795 if (*name != '\0' && *name != ',' && *name != ';') { 796 name = getoffset(name, &dstoffset); 797 if (name == NULL) 798 return -1; 799 } else dstoffset = stdoffset - SECSPERHOUR; 800 if (*name == '\0' && load_result != 0) 801 name = TZDEFRULESTRING; 802 if (*name == ',' || *name == ';') { 803 struct rule start; 804 struct rule end; 805 register int year; 806 register time_t janfirst; 807 time_t starttime; 808 time_t endtime; 809 810 ++name; 811 if ((name = getrule(name, &start)) == NULL) 812 return -1; 813 if (*name++ != ',') 814 return -1; 815 if ((name = getrule(name, &end)) == NULL) 816 return -1; 817 if (*name != '\0') 818 return -1; 819 sp->typecnt = 2; /* standard time and DST */ 820 /* 821 ** Two transitions per year, from EPOCH_YEAR to 2037. 822 */ 823 sp->timecnt = 2 * (2037 - EPOCH_YEAR + 1); 824 if (sp->timecnt > TZ_MAX_TIMES) 825 return -1; 826 sp->ttis[0].tt_gmtoff = -dstoffset; 827 sp->ttis[0].tt_isdst = 1; 828 sp->ttis[0].tt_abbrind = stdlen + 1; 829 sp->ttis[1].tt_gmtoff = -stdoffset; 830 sp->ttis[1].tt_isdst = 0; 831 sp->ttis[1].tt_abbrind = 0; 832 atp = sp->ats; 833 typep = sp->types; 834 janfirst = 0; 835 for (year = EPOCH_YEAR; year <= 2037; ++year) { 836 starttime = transtime(janfirst, year, &start, 837 stdoffset); 838 endtime = transtime(janfirst, year, &end, 839 dstoffset); 840 if (starttime > endtime) { 841 *atp++ = endtime; 842 *typep++ = 1; /* DST ends */ 843 *atp++ = starttime; 844 *typep++ = 0; /* DST begins */ 845 } else { 846 *atp++ = starttime; 847 *typep++ = 0; /* DST begins */ 848 *atp++ = endtime; 849 *typep++ = 1; /* DST ends */ 850 } 851 janfirst += year_lengths[isleap(year)] * 852 SECSPERDAY; 853 } 854 } else { 855 register long theirstdoffset; 856 register long theirdstoffset; 857 register long theiroffset; 858 register int isdst; 859 register int i; 860 register int j; 861 862 if (*name != '\0') 863 return -1; 864 /* 865 ** Initial values of theirstdoffset and theirdstoffset. 866 */ 867 theirstdoffset = 0; 868 for (i = 0; i < sp->timecnt; ++i) { 869 j = sp->types[i]; 870 if (!sp->ttis[j].tt_isdst) { 871 theirstdoffset = 872 -sp->ttis[j].tt_gmtoff; 873 break; 874 } 875 } 876 theirdstoffset = 0; 877 for (i = 0; i < sp->timecnt; ++i) { 878 j = sp->types[i]; 879 if (sp->ttis[j].tt_isdst) { 880 theirdstoffset = 881 -sp->ttis[j].tt_gmtoff; 882 break; 883 } 884 } 885 /* 886 ** Initially we're assumed to be in standard time. 887 */ 888 isdst = FALSE; 889 theiroffset = theirstdoffset; 890 /* 891 ** Now juggle transition times and types 892 ** tracking offsets as you do. 893 */ 894 for (i = 0; i < sp->timecnt; ++i) { 895 j = sp->types[i]; 896 sp->types[i] = sp->ttis[j].tt_isdst; 897 if (sp->ttis[j].tt_ttisgmt) { 898 /* No adjustment to transition time */ 899 } else { 900 /* 901 ** If summer time is in effect, and the 902 ** transition time was not specified as 903 ** standard time, add the summer time 904 ** offset to the transition time; 905 ** otherwise, add the standard time 906 ** offset to the transition time. 907 */ 908 /* 909 ** Transitions from DST to DDST 910 ** will effectively disappear since 911 ** POSIX provides for only one DST 912 ** offset. 913 */ 914 if (isdst && !sp->ttis[j].tt_ttisstd) { 915 sp->ats[i] += dstoffset - 916 theirdstoffset; 917 } else { 918 sp->ats[i] += stdoffset - 919 theirstdoffset; 920 } 921 } 922 theiroffset = -sp->ttis[j].tt_gmtoff; 923 if (sp->ttis[j].tt_isdst) 924 theirdstoffset = theiroffset; 925 else theirstdoffset = theiroffset; 926 } 927 /* 928 ** Finally, fill in ttis. 929 ** ttisstd and ttisgmt need not be handled. 930 */ 931 sp->ttis[0].tt_gmtoff = -stdoffset; 932 sp->ttis[0].tt_isdst = FALSE; 933 sp->ttis[0].tt_abbrind = 0; 934 sp->ttis[1].tt_gmtoff = -dstoffset; 935 sp->ttis[1].tt_isdst = TRUE; 936 sp->ttis[1].tt_abbrind = stdlen + 1; 937 sp->typecnt = 2; 938 } 939 } else { 940 dstlen = 0; 941 sp->typecnt = 1; /* only standard time */ 942 sp->timecnt = 0; 943 sp->ttis[0].tt_gmtoff = -stdoffset; 944 sp->ttis[0].tt_isdst = 0; 945 sp->ttis[0].tt_abbrind = 0; 946 } 947 sp->charcnt = stdlen + 1; 948 if (dstlen != 0) 949 sp->charcnt += dstlen + 1; 950 if ((size_t) sp->charcnt > sizeof sp->chars) 951 return -1; 952 cp = sp->chars; 953 (void) strncpy(cp, stdname, stdlen); 954 cp += stdlen; 955 *cp++ = '\0'; 956 if (dstlen != 0) { 957 (void) strncpy(cp, dstname, dstlen); 958 *(cp + dstlen) = '\0'; 959 } 960 return 0; 961 } 962 963 static void 964 gmtload(sp) 965 struct state * const sp; 966 { 967 if (tzload(gmt, sp) != 0) 968 (void) tzparse(gmt, sp, TRUE); 969 } 970 971 static void 972 tzsetwall_unlocked P((void)) 973 { 974 if (lcl_is_set < 0) 975 return; 976 lcl_is_set = -1; 977 978 #ifdef ALL_STATE 979 if (lclptr == NULL) { 980 lclptr = (struct state *) malloc(sizeof *lclptr); 981 if (lclptr == NULL) { 982 settzname(); /* all we can do */ 983 return; 984 } 985 } 986 #endif /* defined ALL_STATE */ 987 if (tzload((char *) NULL, lclptr) != 0) 988 gmtload(lclptr); 989 settzname(); 990 } 991 992 #ifndef STD_INSPIRED 993 /* 994 ** A non-static declaration of tzsetwall in a system header file 995 ** may cause a warning about this upcoming static declaration... 996 */ 997 static 998 #endif /* !defined STD_INSPIRED */ 999 void 1000 tzsetwall P((void)) 1001 { 1002 rwlock_wrlock(&lcl_lock); 1003 tzsetwall_unlocked(); 1004 rwlock_unlock(&lcl_lock); 1005 } 1006 1007 static void 1008 tzset_unlocked P((void)) 1009 { 1010 register const char * name; 1011 1012 name = getenv("TZ"); 1013 if (name == NULL) { 1014 tzsetwall_unlocked(); 1015 return; 1016 } 1017 1018 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) 1019 return; 1020 lcl_is_set = strlen(name) < sizeof lcl_TZname; 1021 if (lcl_is_set) 1022 (void)strlcpy(lcl_TZname, name, sizeof(lcl_TZname)); 1023 1024 #ifdef ALL_STATE 1025 if (lclptr == NULL) { 1026 lclptr = (struct state *) malloc(sizeof *lclptr); 1027 if (lclptr == NULL) { 1028 settzname(); /* all we can do */ 1029 return; 1030 } 1031 } 1032 #endif /* defined ALL_STATE */ 1033 if (*name == '\0') { 1034 /* 1035 ** User wants it fast rather than right. 1036 */ 1037 lclptr->leapcnt = 0; /* so, we're off a little */ 1038 lclptr->timecnt = 0; 1039 lclptr->typecnt = 0; 1040 lclptr->ttis[0].tt_isdst = 0; 1041 lclptr->ttis[0].tt_gmtoff = 0; 1042 lclptr->ttis[0].tt_abbrind = 0; 1043 (void)strlcpy(lclptr->chars, gmt, sizeof(lclptr->chars)); 1044 } else if (tzload(name, lclptr) != 0) 1045 if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0) 1046 (void) gmtload(lclptr); 1047 settzname(); 1048 } 1049 1050 void 1051 tzset P((void)) 1052 { 1053 rwlock_wrlock(&lcl_lock); 1054 tzset_unlocked(); 1055 rwlock_unlock(&lcl_lock); 1056 } 1057 1058 /* 1059 ** The easy way to behave "as if no library function calls" localtime 1060 ** is to not call it--so we drop its guts into "localsub", which can be 1061 ** freely called. (And no, the PANS doesn't require the above behavior-- 1062 ** but it *is* desirable.) 1063 ** 1064 ** The unused offset argument is for the benefit of mktime variants. 1065 */ 1066 1067 /*ARGSUSED*/ 1068 static void 1069 localsub(timep, offset, tmp) 1070 const time_t * const timep; 1071 const long offset; 1072 struct tm * const tmp; 1073 { 1074 register struct state * sp; 1075 register const struct ttinfo * ttisp; 1076 register int i; 1077 const time_t t = *timep; 1078 1079 sp = lclptr; 1080 #ifdef ALL_STATE 1081 if (sp == NULL) { 1082 gmtsub(timep, offset, tmp); 1083 return; 1084 } 1085 #endif /* defined ALL_STATE */ 1086 if (sp->timecnt == 0 || t < sp->ats[0]) { 1087 i = 0; 1088 while (sp->ttis[i].tt_isdst) 1089 if (++i >= sp->typecnt) { 1090 i = 0; 1091 break; 1092 } 1093 } else { 1094 for (i = 1; i < sp->timecnt; ++i) 1095 if (t < sp->ats[i]) 1096 break; 1097 i = sp->types[i - 1]; 1098 } 1099 ttisp = &sp->ttis[i]; 1100 /* 1101 ** To get (wrong) behavior that's compatible with System V Release 2.0 1102 ** you'd replace the statement below with 1103 ** t += ttisp->tt_gmtoff; 1104 ** timesub(&t, 0L, sp, tmp); 1105 */ 1106 timesub(&t, ttisp->tt_gmtoff, sp, tmp); 1107 tmp->tm_isdst = ttisp->tt_isdst; 1108 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; 1109 #ifdef TM_ZONE 1110 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; 1111 #endif /* defined TM_ZONE */ 1112 } 1113 1114 struct tm * 1115 localtime(timep) 1116 const time_t * const timep; 1117 { 1118 rwlock_wrlock(&lcl_lock); 1119 tzset_unlocked(); 1120 localsub(timep, 0L, &tm); 1121 rwlock_unlock(&lcl_lock); 1122 return &tm; 1123 } 1124 1125 /* 1126 ** Re-entrant version of localtime. 1127 */ 1128 1129 struct tm * 1130 localtime_r(timep, tmp) 1131 const time_t * const timep; 1132 struct tm * tmp; 1133 { 1134 rwlock_rdlock(&lcl_lock); 1135 localsub(timep, 0L, tmp); 1136 rwlock_unlock(&lcl_lock); 1137 return tmp; 1138 } 1139 1140 /* 1141 ** gmtsub is to gmtime as localsub is to localtime. 1142 */ 1143 1144 static void 1145 gmtsub(timep, offset, tmp) 1146 const time_t * const timep; 1147 const long offset; 1148 struct tm * const tmp; 1149 { 1150 #ifdef _REENTRANT 1151 static mutex_t gmt_mutex = MUTEX_INITIALIZER; 1152 #endif 1153 1154 mutex_lock(&gmt_mutex); 1155 if (!gmt_is_set) { 1156 gmt_is_set = TRUE; 1157 #ifdef ALL_STATE 1158 gmtptr = (struct state *) malloc(sizeof *gmtptr); 1159 if (gmtptr != NULL) 1160 #endif /* defined ALL_STATE */ 1161 gmtload(gmtptr); 1162 } 1163 mutex_unlock(&gmt_mutex); 1164 timesub(timep, offset, gmtptr, tmp); 1165 #ifdef TM_ZONE 1166 /* 1167 ** Could get fancy here and deliver something such as 1168 ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero, 1169 ** but this is no time for a treasure hunt. 1170 */ 1171 if (offset != 0) 1172 /* LINTED const castaway */ 1173 tmp->TM_ZONE = (__aconst char *)wildabbr; 1174 else { 1175 #ifdef ALL_STATE 1176 if (gmtptr == NULL) 1177 tmp->TM_ZONE = (__aconst char *)gmt; 1178 else tmp->TM_ZONE = gmtptr->chars; 1179 #endif /* defined ALL_STATE */ 1180 #ifndef ALL_STATE 1181 tmp->TM_ZONE = gmtptr->chars; 1182 #endif /* State Farm */ 1183 } 1184 #endif /* defined TM_ZONE */ 1185 } 1186 1187 struct tm * 1188 gmtime(timep) 1189 const time_t * const timep; 1190 { 1191 gmtsub(timep, 0L, &tm); 1192 return &tm; 1193 } 1194 1195 /* 1196 ** Re-entrant version of gmtime. 1197 */ 1198 1199 struct tm * 1200 gmtime_r(timep, tmp) 1201 const time_t * const timep; 1202 struct tm * tmp; 1203 { 1204 gmtsub(timep, 0L, tmp); 1205 return tmp; 1206 } 1207 1208 #ifdef STD_INSPIRED 1209 1210 struct tm * 1211 offtime(timep, offset) 1212 const time_t * const timep; 1213 const long offset; 1214 { 1215 gmtsub(timep, offset, &tm); 1216 return &tm; 1217 } 1218 1219 #endif /* defined STD_INSPIRED */ 1220 1221 static void 1222 timesub(timep, offset, sp, tmp) 1223 const time_t * const timep; 1224 const long offset; 1225 register const struct state * const sp; 1226 register struct tm * const tmp; 1227 { 1228 register const struct lsinfo * lp; 1229 register long days; 1230 register long rem; 1231 register int y; 1232 register int yleap; 1233 register const int * ip; 1234 register long corr; 1235 register int hit; 1236 register int i; 1237 1238 corr = 0; 1239 hit = 0; 1240 #ifdef ALL_STATE 1241 i = (sp == NULL) ? 0 : sp->leapcnt; 1242 #endif /* defined ALL_STATE */ 1243 #ifndef ALL_STATE 1244 i = sp->leapcnt; 1245 #endif /* State Farm */ 1246 while (--i >= 0) { 1247 lp = &sp->lsis[i]; 1248 if (*timep >= lp->ls_trans) { 1249 if (*timep == lp->ls_trans) { 1250 hit = ((i == 0 && lp->ls_corr > 0) || 1251 lp->ls_corr > sp->lsis[i - 1].ls_corr); 1252 if (hit) 1253 while (i > 0 && 1254 sp->lsis[i].ls_trans == 1255 sp->lsis[i - 1].ls_trans + 1 && 1256 sp->lsis[i].ls_corr == 1257 sp->lsis[i - 1].ls_corr + 1) { 1258 ++hit; 1259 --i; 1260 } 1261 } 1262 corr = lp->ls_corr; 1263 break; 1264 } 1265 } 1266 days = *timep / SECSPERDAY; 1267 rem = *timep % SECSPERDAY; 1268 #ifdef mc68k 1269 if (*timep == 0x80000000) { 1270 /* 1271 ** A 3B1 muffs the division on the most negative number. 1272 */ 1273 days = -24855; 1274 rem = -11648; 1275 } 1276 #endif /* defined mc68k */ 1277 rem += (offset - corr); 1278 while (rem < 0) { 1279 rem += SECSPERDAY; 1280 --days; 1281 } 1282 while (rem >= SECSPERDAY) { 1283 rem -= SECSPERDAY; 1284 ++days; 1285 } 1286 tmp->tm_hour = (int) (rem / SECSPERHOUR); 1287 rem = rem % SECSPERHOUR; 1288 tmp->tm_min = (int) (rem / SECSPERMIN); 1289 /* 1290 ** A positive leap second requires a special 1291 ** representation. This uses "... ??:59:60" et seq. 1292 */ 1293 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; 1294 tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK); 1295 if (tmp->tm_wday < 0) 1296 tmp->tm_wday += DAYSPERWEEK; 1297 y = EPOCH_YEAR; 1298 #define LEAPS_THRU_END_OF(y) ((y) / 4 - (y) / 100 + (y) / 400) 1299 while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) { 1300 register int newy; 1301 1302 newy = (int)(y + days / DAYSPERNYEAR); 1303 if (days < 0) 1304 --newy; 1305 days -= (newy - y) * DAYSPERNYEAR + 1306 LEAPS_THRU_END_OF(newy - 1) - 1307 LEAPS_THRU_END_OF(y - 1); 1308 y = newy; 1309 } 1310 tmp->tm_year = y - TM_YEAR_BASE; 1311 tmp->tm_yday = (int) days; 1312 ip = mon_lengths[yleap]; 1313 for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon)) 1314 days = days - (long) ip[tmp->tm_mon]; 1315 tmp->tm_mday = (int) (days + 1); 1316 tmp->tm_isdst = 0; 1317 #ifdef TM_GMTOFF 1318 tmp->TM_GMTOFF = offset; 1319 #endif /* defined TM_GMTOFF */ 1320 } 1321 1322 char * 1323 ctime(timep) 1324 const time_t * const timep; 1325 { 1326 /* 1327 ** Section 4.12.3.2 of X3.159-1989 requires that 1328 ** The ctime function converts the calendar time pointed to by timer 1329 ** to local time in the form of a string. It is equivalent to 1330 ** asctime(localtime(timer)) 1331 */ 1332 return asctime(localtime(timep)); 1333 } 1334 1335 char * 1336 ctime_r(timep, buf) 1337 const time_t * const timep; 1338 char * buf; 1339 { 1340 struct tm tmp; 1341 1342 return asctime_r(localtime_r(timep, &tmp), buf); 1343 } 1344 1345 /* 1346 ** Adapted from code provided by Robert Elz, who writes: 1347 ** The "best" way to do mktime I think is based on an idea of Bob 1348 ** Kridle's (so its said...) from a long time ago. 1349 ** [kridle (at) xinet.com as of 1996-01-16.] 1350 ** It does a binary search of the time_t space. Since time_t's are 1351 ** just 32 bits, its a max of 32 iterations (even at 64 bits it 1352 ** would still be very reasonable). 1353 */ 1354 1355 #ifndef WRONG 1356 #define WRONG (-1) 1357 #endif /* !defined WRONG */ 1358 1359 /* 1360 ** Simplified normalize logic courtesy Paul Eggert (eggert (at) twinsun.com). 1361 */ 1362 1363 static int 1364 increment_overflow(number, delta) 1365 int * number; 1366 int delta; 1367 { 1368 int number0; 1369 1370 number0 = *number; 1371 *number += delta; 1372 return (*number < number0) != (delta < 0); 1373 } 1374 1375 static int 1376 normalize_overflow(tensptr, unitsptr, base) 1377 int * const tensptr; 1378 int * const unitsptr; 1379 const int base; 1380 { 1381 register int tensdelta; 1382 1383 tensdelta = (*unitsptr >= 0) ? 1384 (*unitsptr / base) : 1385 (-1 - (-1 - *unitsptr) / base); 1386 *unitsptr -= tensdelta * base; 1387 return increment_overflow(tensptr, tensdelta); 1388 } 1389 1390 static int 1391 tmcomp(atmp, btmp) 1392 register const struct tm * const atmp; 1393 register const struct tm * const btmp; 1394 { 1395 register int result; 1396 1397 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && 1398 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && 1399 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && 1400 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && 1401 (result = (atmp->tm_min - btmp->tm_min)) == 0) 1402 result = atmp->tm_sec - btmp->tm_sec; 1403 return result; 1404 } 1405 1406 static time_t 1407 time2sub(tmp, funcp, offset, okayp, do_norm_secs) 1408 struct tm * const tmp; 1409 void (* const funcp) P((const time_t*, long, struct tm*)); 1410 const long offset; 1411 int * const okayp; 1412 const int do_norm_secs; 1413 { 1414 register const struct state * sp; 1415 register int dir; 1416 register int bits; 1417 register int i, j ; 1418 register int saved_seconds; 1419 time_t newt; 1420 time_t t; 1421 struct tm yourtm, mytm; 1422 1423 *okayp = FALSE; 1424 yourtm = *tmp; 1425 if (do_norm_secs) { 1426 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec, 1427 SECSPERMIN)) 1428 return WRONG; 1429 } 1430 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) 1431 return WRONG; 1432 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) 1433 return WRONG; 1434 if (normalize_overflow(&yourtm.tm_year, &yourtm.tm_mon, MONSPERYEAR)) 1435 return WRONG; 1436 /* 1437 ** Turn yourtm.tm_year into an actual year number for now. 1438 ** It is converted back to an offset from TM_YEAR_BASE later. 1439 */ 1440 if (increment_overflow(&yourtm.tm_year, TM_YEAR_BASE)) 1441 return WRONG; 1442 while (yourtm.tm_mday <= 0) { 1443 if (increment_overflow(&yourtm.tm_year, -1)) 1444 return WRONG; 1445 i = yourtm.tm_year + (1 < yourtm.tm_mon); 1446 yourtm.tm_mday += year_lengths[isleap(i)]; 1447 } 1448 while (yourtm.tm_mday > DAYSPERLYEAR) { 1449 i = yourtm.tm_year + (1 < yourtm.tm_mon); 1450 yourtm.tm_mday -= year_lengths[isleap(i)]; 1451 if (increment_overflow(&yourtm.tm_year, 1)) 1452 return WRONG; 1453 } 1454 for ( ; ; ) { 1455 i = mon_lengths[isleap(yourtm.tm_year)][yourtm.tm_mon]; 1456 if (yourtm.tm_mday <= i) 1457 break; 1458 yourtm.tm_mday -= i; 1459 if (++yourtm.tm_mon >= MONSPERYEAR) { 1460 yourtm.tm_mon = 0; 1461 if (increment_overflow(&yourtm.tm_year, 1)) 1462 return WRONG; 1463 } 1464 } 1465 if (increment_overflow(&yourtm.tm_year, -TM_YEAR_BASE)) 1466 return WRONG; 1467 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN) 1468 saved_seconds = 0; 1469 else if (yourtm.tm_year + TM_YEAR_BASE < EPOCH_YEAR) { 1470 /* 1471 ** We can't set tm_sec to 0, because that might push the 1472 ** time below the minimum representable time. 1473 ** Set tm_sec to 59 instead. 1474 ** This assumes that the minimum representable time is 1475 ** not in the same minute that a leap second was deleted from, 1476 ** which is a safer assumption than using 58 would be. 1477 */ 1478 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) 1479 return WRONG; 1480 saved_seconds = yourtm.tm_sec; 1481 yourtm.tm_sec = SECSPERMIN - 1; 1482 } else { 1483 saved_seconds = yourtm.tm_sec; 1484 yourtm.tm_sec = 0; 1485 } 1486 /* 1487 ** Divide the search space in half 1488 ** (this works whether time_t is signed or unsigned). 1489 */ 1490 bits = TYPE_BIT(time_t) - 1; 1491 /* 1492 ** If time_t is signed, then 0 is just above the median, 1493 ** assuming two's complement arithmetic. 1494 ** If time_t is unsigned, then (1 << bits) is just above the median. 1495 */ 1496 /* LINTED constant in conditional context */ 1497 t = TYPE_SIGNED(time_t) ? 0 : (((time_t) 1) << bits); 1498 for ( ; ; ) { 1499 (*funcp)(&t, offset, &mytm); 1500 dir = tmcomp(&mytm, &yourtm); 1501 if (dir != 0) { 1502 if (bits-- < 0) 1503 return WRONG; 1504 if (bits < 0) 1505 --t; /* may be needed if new t is minimal */ 1506 else if (dir > 0) 1507 t -= ((time_t) 1) << bits; 1508 else t += ((time_t) 1) << bits; 1509 continue; 1510 } 1511 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) 1512 break; 1513 /* 1514 ** Right time, wrong type. 1515 ** Hunt for right time, right type. 1516 ** It's okay to guess wrong since the guess 1517 ** gets checked. 1518 */ 1519 /* 1520 ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. 1521 */ 1522 sp = (const struct state *) 1523 (((void *) funcp == (void *) localsub) ? 1524 lclptr : gmtptr); 1525 #ifdef ALL_STATE 1526 if (sp == NULL) 1527 return WRONG; 1528 #endif /* defined ALL_STATE */ 1529 for (i = sp->typecnt - 1; i >= 0; --i) { 1530 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) 1531 continue; 1532 for (j = sp->typecnt - 1; j >= 0; --j) { 1533 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) 1534 continue; 1535 newt = t + sp->ttis[j].tt_gmtoff - 1536 sp->ttis[i].tt_gmtoff; 1537 (*funcp)(&newt, offset, &mytm); 1538 if (tmcomp(&mytm, &yourtm) != 0) 1539 continue; 1540 if (mytm.tm_isdst != yourtm.tm_isdst) 1541 continue; 1542 /* 1543 ** We have a match. 1544 */ 1545 t = newt; 1546 goto label; 1547 } 1548 } 1549 return WRONG; 1550 } 1551 label: 1552 newt = t + saved_seconds; 1553 if ((newt < t) != (saved_seconds < 0)) 1554 return WRONG; 1555 t = newt; 1556 (*funcp)(&t, offset, tmp); 1557 *okayp = TRUE; 1558 return t; 1559 } 1560 1561 static time_t 1562 time2(tmp, funcp, offset, okayp) 1563 struct tm * const tmp; 1564 void (* const funcp) P((const time_t*, long, struct tm*)); 1565 const long offset; 1566 int * const okayp; 1567 { 1568 time_t t; 1569 1570 /* 1571 ** First try without normalization of seconds 1572 ** (in case tm_sec contains a value associated with a leap second). 1573 ** If that fails, try with normalization of seconds. 1574 */ 1575 t = time2sub(tmp, funcp, offset, okayp, FALSE); 1576 return *okayp ? t : time2sub(tmp, funcp, offset, okayp, TRUE); 1577 } 1578 1579 static time_t 1580 time1(tmp, funcp, offset) 1581 struct tm * const tmp; 1582 void (* const funcp) P((const time_t *, long, struct tm *)); 1583 const long offset; 1584 { 1585 register time_t t; 1586 register const struct state * sp; 1587 register int samei, otheri; 1588 register int sameind, otherind; 1589 register int i; 1590 register int nseen; 1591 int seen[TZ_MAX_TYPES]; 1592 int types[TZ_MAX_TYPES]; 1593 int okay; 1594 1595 if (tmp->tm_isdst > 1) 1596 tmp->tm_isdst = 1; 1597 t = time2(tmp, funcp, offset, &okay); 1598 #ifdef PCTS 1599 /* 1600 ** PCTS code courtesy Grant Sullivan (grant (at) osf.org). 1601 */ 1602 if (okay) 1603 return t; 1604 if (tmp->tm_isdst < 0) 1605 tmp->tm_isdst = 0; /* reset to std and try again */ 1606 #endif /* defined PCTS */ 1607 #ifndef PCTS 1608 if (okay || tmp->tm_isdst < 0) 1609 return t; 1610 #endif /* !defined PCTS */ 1611 /* 1612 ** We're supposed to assume that somebody took a time of one type 1613 ** and did some math on it that yielded a "struct tm" that's bad. 1614 ** We try to divine the type they started from and adjust to the 1615 ** type they need. 1616 */ 1617 /* 1618 ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. 1619 */ 1620 sp = (const struct state *) (((void *) funcp == (void *) localsub) ? 1621 lclptr : gmtptr); 1622 #ifdef ALL_STATE 1623 if (sp == NULL) 1624 return WRONG; 1625 #endif /* defined ALL_STATE */ 1626 for (i = 0; i < sp->typecnt; ++i) 1627 seen[i] = FALSE; 1628 nseen = 0; 1629 for (i = sp->timecnt - 1; i >= 0; --i) 1630 if (!seen[sp->types[i]]) { 1631 seen[sp->types[i]] = TRUE; 1632 types[nseen++] = sp->types[i]; 1633 } 1634 for (sameind = 0; sameind < nseen; ++sameind) { 1635 samei = types[sameind]; 1636 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) 1637 continue; 1638 for (otherind = 0; otherind < nseen; ++otherind) { 1639 otheri = types[otherind]; 1640 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) 1641 continue; 1642 tmp->tm_sec += (int)(sp->ttis[otheri].tt_gmtoff - 1643 sp->ttis[samei].tt_gmtoff); 1644 tmp->tm_isdst = !tmp->tm_isdst; 1645 t = time2(tmp, funcp, offset, &okay); 1646 if (okay) 1647 return t; 1648 tmp->tm_sec -= (int)(sp->ttis[otheri].tt_gmtoff - 1649 sp->ttis[samei].tt_gmtoff); 1650 tmp->tm_isdst = !tmp->tm_isdst; 1651 } 1652 } 1653 return WRONG; 1654 } 1655 1656 time_t 1657 mktime(tmp) 1658 struct tm * const tmp; 1659 { 1660 time_t result; 1661 1662 rwlock_wrlock(&lcl_lock); 1663 tzset_unlocked(); 1664 result = time1(tmp, localsub, 0L); 1665 rwlock_unlock(&lcl_lock); 1666 return (result); 1667 } 1668 1669 #ifdef STD_INSPIRED 1670 1671 time_t 1672 timelocal(tmp) 1673 struct tm * const tmp; 1674 { 1675 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 1676 return mktime(tmp); 1677 } 1678 1679 time_t 1680 timegm(tmp) 1681 struct tm * const tmp; 1682 { 1683 tmp->tm_isdst = 0; 1684 return time1(tmp, gmtsub, 0L); 1685 } 1686 1687 time_t 1688 timeoff(tmp, offset) 1689 struct tm * const tmp; 1690 const long offset; 1691 { 1692 tmp->tm_isdst = 0; 1693 return time1(tmp, gmtsub, offset); 1694 } 1695 1696 #endif /* defined STD_INSPIRED */ 1697 1698 #ifdef CMUCS 1699 1700 /* 1701 ** The following is supplied for compatibility with 1702 ** previous versions of the CMUCS runtime library. 1703 */ 1704 1705 long 1706 gtime(tmp) 1707 struct tm * const tmp; 1708 { 1709 const time_t t = mktime(tmp); 1710 1711 if (t == WRONG) 1712 return -1; 1713 return t; 1714 } 1715 1716 #endif /* defined CMUCS */ 1717 1718 /* 1719 ** XXX--is the below the right way to conditionalize?? 1720 */ 1721 1722 #ifdef STD_INSPIRED 1723 1724 /* 1725 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 1726 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which 1727 ** is not the case if we are accounting for leap seconds. 1728 ** So, we provide the following conversion routines for use 1729 ** when exchanging timestamps with POSIX conforming systems. 1730 */ 1731 1732 static long 1733 leapcorr(timep) 1734 time_t * timep; 1735 { 1736 register struct state * sp; 1737 register struct lsinfo * lp; 1738 register int i; 1739 1740 sp = lclptr; 1741 i = sp->leapcnt; 1742 while (--i >= 0) { 1743 lp = &sp->lsis[i]; 1744 if (*timep >= lp->ls_trans) 1745 return lp->ls_corr; 1746 } 1747 return 0; 1748 } 1749 1750 time_t 1751 time2posix(t) 1752 time_t t; 1753 { 1754 time_t result; 1755 1756 rwlock_wrlock(&lcl_lock); 1757 tzset_unlocked(); 1758 result = t - leapcorr(&t); 1759 rwlock_unlock(&lcl_lock); 1760 return (result); 1761 } 1762 1763 time_t 1764 posix2time(t) 1765 time_t t; 1766 { 1767 time_t x; 1768 time_t y; 1769 1770 rwlock_wrlock(&lcl_lock); 1771 tzset_unlocked(); 1772 /* 1773 ** For a positive leap second hit, the result 1774 ** is not unique. For a negative leap second 1775 ** hit, the corresponding time doesn't exist, 1776 ** so we return an adjacent second. 1777 */ 1778 x = t + leapcorr(&t); 1779 y = x - leapcorr(&x); 1780 if (y < t) { 1781 do { 1782 x++; 1783 y = x - leapcorr(&x); 1784 } while (y < t); 1785 if (t != y) { 1786 rwlock_unlock(&lcl_lock); 1787 return x - 1; 1788 } 1789 } else if (y > t) { 1790 do { 1791 --x; 1792 y = x - leapcorr(&x); 1793 } while (y > t); 1794 if (t != y) { 1795 rwlock_unlock(&lcl_lock); 1796 return x + 1; 1797 } 1798 } 1799 rwlock_unlock(&lcl_lock); 1800 return x; 1801 } 1802 1803 #endif /* defined STD_INSPIRED */ 1804
Indexes created Thu Oct 02 10:09:58 GMT 2025