localtime.c revision 1.6
1 /* $NetBSD: localtime.c,v 1.6 1996/01/20 02:31:04 jtc Exp $ */ 2 3 #ifndef lint 4 #ifndef NOID 5 static char elsieid[] = "@(#)localtime.c 7.53"; 6 #endif /* !defined NOID */ 7 #endif /* !defined lint */ 8 9 /* 10 ** Leap second handling from Bradley White (bww (at) k.gp.cs.cmu.edu). 11 ** POSIX-style TZ environment variable handling from Guy Harris 12 ** (guy (at) auspex.com). 13 */ 14 15 /*LINTLIBRARY*/ 16 17 #include "private.h" 18 #include "tzfile.h" 19 #include "fcntl.h" 20 21 /* 22 ** SunOS 4.1.1 headers lack O_BINARY. 23 */ 24 25 #ifdef O_BINARY 26 #define OPEN_MODE (O_RDONLY | O_BINARY) 27 #endif /* defined O_BINARY */ 28 #ifndef O_BINARY 29 #define OPEN_MODE O_RDONLY 30 #endif /* !defined O_BINARY */ 31 32 #ifndef WILDABBR 33 /* 34 ** Someone might make incorrect use of a time zone abbreviation: 35 ** 1. They might reference tzname[0] before calling tzset (explicitly 36 ** or implicitly). 37 ** 2. They might reference tzname[1] before calling tzset (explicitly 38 ** or implicitly). 39 ** 3. They might reference tzname[1] after setting to a time zone 40 ** in which Daylight Saving Time is never observed. 41 ** 4. They might reference tzname[0] after setting to a time zone 42 ** in which Standard Time is never observed. 43 ** 5. They might reference tm.TM_ZONE after calling offtime. 44 ** What's best to do in the above cases is open to debate; 45 ** for now, we just set things up so that in any of the five cases 46 ** WILDABBR is used. Another possibility: initialize tzname[0] to the 47 ** string "tzname[0] used before set", and similarly for the other cases. 48 ** And another: initialize tzname[0] to "ERA", with an explanation in the 49 ** manual page of what this "time zone abbreviation" means (doing this so 50 ** that tzname[0] has the "normal" length of three characters). 51 */ 52 #define WILDABBR " " 53 #endif /* !defined WILDABBR */ 54 55 static char wildabbr[] = "WILDABBR"; 56 57 static const char gmt[] = "GMT"; 58 59 struct ttinfo { /* time type information */ 60 long tt_gmtoff; /* GMT offset in seconds */ 61 int tt_isdst; /* used to set tm_isdst */ 62 int tt_abbrind; /* abbreviation list index */ 63 int tt_ttisstd; /* TRUE if transition is std time */ 64 int tt_ttisgmt; /* TRUE if transition is GMT */ 65 }; 66 67 struct lsinfo { /* leap second information */ 68 time_t ls_trans; /* transition time */ 69 long ls_corr; /* correction to apply */ 70 }; 71 72 #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) 73 74 #ifdef TZNAME_MAX 75 #define MY_TZNAME_MAX TZNAME_MAX 76 #endif /* defined TZNAME_MAX */ 77 #ifndef TZNAME_MAX 78 #define MY_TZNAME_MAX 255 79 #endif /* !defined TZNAME_MAX */ 80 81 struct state { 82 int leapcnt; 83 int timecnt; 84 int typecnt; 85 int charcnt; 86 time_t ats[TZ_MAX_TIMES]; 87 unsigned char types[TZ_MAX_TIMES]; 88 struct ttinfo ttis[TZ_MAX_TYPES]; 89 char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt), 90 (2 * (MY_TZNAME_MAX + 1)))]; 91 struct lsinfo lsis[TZ_MAX_LEAPS]; 92 }; 93 94 struct rule { 95 int r_type; /* type of rule--see below */ 96 int r_day; /* day number of rule */ 97 int r_week; /* week number of rule */ 98 int r_mon; /* month number of rule */ 99 long r_time; /* transition time of rule */ 100 }; 101 102 #define JULIAN_DAY 0 /* Jn - Julian day */ 103 #define DAY_OF_YEAR 1 /* n - day of year */ 104 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */ 105 106 /* 107 ** Prototypes for static functions. 108 */ 109 110 static long detzcode P((const char * codep)); 111 static const char * getzname P((const char * strp)); 112 static const char * getnum P((const char * strp, int * nump, int min, 113 int max)); 114 static const char * getsecs P((const char * strp, long * secsp)); 115 static const char * getoffset P((const char * strp, long * offsetp)); 116 static const char * getrule P((const char * strp, struct rule * rulep)); 117 static void gmtload P((struct state * sp)); 118 static void gmtsub P((const time_t * timep, long offset, 119 struct tm * tmp)); 120 static void localsub P((const time_t * timep, long offset, 121 struct tm * tmp)); 122 static int increment_overflow P((int * number, int delta)); 123 static int normalize_overflow P((int * tensptr, int * unitsptr, 124 int base)); 125 static void settzname P((void)); 126 static time_t time1 P((struct tm * tmp, 127 void(*funcp) P((const time_t *, 128 long, struct tm *)), 129 long offset)); 130 static time_t time2 P((struct tm *tmp, 131 void(*funcp) P((const time_t *, 132 long, struct tm*)), 133 long offset, int * okayp)); 134 static void timesub P((const time_t * timep, long offset, 135 const struct state * sp, struct tm * tmp)); 136 static int tmcomp P((const struct tm * atmp, 137 const struct tm * btmp)); 138 static time_t transtime P((time_t janfirst, int year, 139 const struct rule * rulep, long offset)); 140 static int tzload P((const char * name, struct state * sp)); 141 static int tzparse P((const char * name, struct state * sp, 142 int lastditch)); 143 144 #ifdef ALL_STATE 145 static struct state * lclptr; 146 static struct state * gmtptr; 147 #endif /* defined ALL_STATE */ 148 149 #ifndef ALL_STATE 150 static struct state lclmem; 151 static struct state gmtmem; 152 #define lclptr (&lclmem) 153 #define gmtptr (&gmtmem) 154 #endif /* State Farm */ 155 156 #ifndef TZ_STRLEN_MAX 157 #define TZ_STRLEN_MAX 255 158 #endif /* !defined TZ_STRLEN_MAX */ 159 160 static char lcl_TZname[TZ_STRLEN_MAX + 1]; 161 static int lcl_is_set; 162 static int gmt_is_set; 163 164 char * tzname[2] = { 165 wildabbr, 166 wildabbr 167 }; 168 169 /* 170 ** Section 4.12.3 of X3.159-1989 requires that 171 ** Except for the strftime function, these functions [asctime, 172 ** ctime, gmtime, localtime] return values in one of two static 173 ** objects: a broken-down time structure and an array of char. 174 ** Thanks to Paul Eggert (eggert (at) twinsun.com) for noting this. 175 */ 176 177 static struct tm tm; 178 179 #ifdef USG_COMPAT 180 time_t timezone = 0; 181 int daylight = 0; 182 #endif /* defined USG_COMPAT */ 183 184 #ifdef ALTZONE 185 time_t altzone = 0; 186 #endif /* defined ALTZONE */ 187 188 static long 189 detzcode(codep) 190 const char * const codep; 191 { 192 register long result; 193 194 /* 195 ** The first character must be sign extended on systems with >32bit 196 ** longs. This was solved differently in the master tzcode sources 197 ** (the fix first appeared in tzcode95c.tar.gz). But I believe 198 ** that this implementation is superior. 199 */ 200 201 #ifdef __STDC__ 202 #define SIGN_EXTEND_CHAR(x) ((signed char) x) 203 #else 204 #define SIGN_EXTEND_CHAR(x) ((x & 0x80) ? ((~0 << 8) | x) : x) 205 #endif 206 207 result = (SIGN_EXTEND_CHAR(codep[0]) << 24) \ 208 | (codep[1] & 0xff) << 16 \ 209 | (codep[2] & 0xff) << 8 210 | (codep[3] & 0xff); 211 return result; 212 } 213 214 static void 215 settzname P((void)) 216 { 217 register struct state * const sp = lclptr; 218 register int i; 219 220 tzname[0] = wildabbr; 221 tzname[1] = wildabbr; 222 #ifdef USG_COMPAT 223 daylight = 0; 224 timezone = 0; 225 #endif /* defined USG_COMPAT */ 226 #ifdef ALTZONE 227 altzone = 0; 228 #endif /* defined ALTZONE */ 229 #ifdef ALL_STATE 230 if (sp == NULL) { 231 tzname[0] = tzname[1] = gmt; 232 return; 233 } 234 #endif /* defined ALL_STATE */ 235 for (i = 0; i < sp->typecnt; ++i) { 236 register const struct ttinfo * const ttisp = &sp->ttis[i]; 237 238 tzname[ttisp->tt_isdst] = 239 &sp->chars[ttisp->tt_abbrind]; 240 #ifdef USG_COMPAT 241 if (ttisp->tt_isdst) 242 daylight = 1; 243 if (i == 0 || !ttisp->tt_isdst) 244 timezone = -(ttisp->tt_gmtoff); 245 #endif /* defined USG_COMPAT */ 246 #ifdef ALTZONE 247 if (i == 0 || ttisp->tt_isdst) 248 altzone = -(ttisp->tt_gmtoff); 249 #endif /* defined ALTZONE */ 250 } 251 /* 252 ** And to get the latest zone names into tzname. . . 253 */ 254 for (i = 0; i < sp->timecnt; ++i) { 255 register const struct ttinfo * const ttisp = 256 &sp->ttis[ 257 sp->types[i]]; 258 259 tzname[ttisp->tt_isdst] = 260 &sp->chars[ttisp->tt_abbrind]; 261 } 262 } 263 264 static int 265 tzload(name, sp) 266 register const char * name; 267 register struct state * const sp; 268 { 269 register const char * p; 270 register int i; 271 register int fid; 272 273 if (name == NULL && (name = TZDEFAULT) == NULL) 274 return -1; 275 { 276 register int doaccess; 277 /* 278 ** Section 4.9.1 of the C standard says that 279 ** "FILENAME_MAX expands to an integral constant expression 280 ** that is the sie needed for an array of char large enough 281 ** to hold the longest file name string that the implementation 282 ** guarantees can be opened." 283 */ 284 char fullname[FILENAME_MAX + 1]; 285 286 if (name[0] == ':') 287 ++name; 288 doaccess = name[0] == '/'; 289 if (!doaccess) { 290 if ((p = TZDIR) == NULL) 291 return -1; 292 if ((strlen(p) + strlen(name) + 1) >= sizeof fullname) 293 return -1; 294 (void) strcpy(fullname, p); 295 (void) strcat(fullname, "/"); 296 (void) strcat(fullname, name); 297 /* 298 ** Set doaccess if '.' (as in "../") shows up in name. 299 */ 300 if (strchr(name, '.') != NULL) 301 doaccess = TRUE; 302 name = fullname; 303 } 304 if (doaccess && access(name, R_OK) != 0) 305 return -1; 306 if ((fid = open(name, OPEN_MODE)) == -1) 307 return -1; 308 } 309 { 310 struct tzhead * tzhp; 311 char buf[sizeof *sp + sizeof *tzhp]; 312 int ttisstdcnt; 313 int ttisgmtcnt; 314 315 i = read(fid, buf, sizeof buf); 316 if (close(fid) != 0) 317 return -1; 318 p = buf; 319 p += sizeof tzhp->tzh_reserved; 320 ttisstdcnt = (int) detzcode(p); 321 p += 4; 322 ttisgmtcnt = (int) detzcode(p); 323 p += 4; 324 sp->leapcnt = (int) detzcode(p); 325 p += 4; 326 sp->timecnt = (int) detzcode(p); 327 p += 4; 328 sp->typecnt = (int) detzcode(p); 329 p += 4; 330 sp->charcnt = (int) detzcode(p); 331 p += 4; 332 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || 333 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || 334 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || 335 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS || 336 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) || 337 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0)) 338 return -1; 339 if (i - (p - buf) < sp->timecnt * 4 + /* ats */ 340 sp->timecnt + /* types */ 341 sp->typecnt * (4 + 2) + /* ttinfos */ 342 sp->charcnt + /* chars */ 343 sp->leapcnt * (4 + 4) + /* lsinfos */ 344 ttisstdcnt + /* ttisstds */ 345 ttisgmtcnt) /* ttisgmts */ 346 return -1; 347 for (i = 0; i < sp->timecnt; ++i) { 348 sp->ats[i] = detzcode(p); 349 p += 4; 350 } 351 for (i = 0; i < sp->timecnt; ++i) { 352 sp->types[i] = (unsigned char) *p++; 353 if (sp->types[i] >= sp->typecnt) 354 return -1; 355 } 356 for (i = 0; i < sp->typecnt; ++i) { 357 register struct ttinfo * ttisp; 358 359 ttisp = &sp->ttis[i]; 360 ttisp->tt_gmtoff = detzcode(p); 361 p += 4; 362 ttisp->tt_isdst = (unsigned char) *p++; 363 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) 364 return -1; 365 ttisp->tt_abbrind = (unsigned char) *p++; 366 if (ttisp->tt_abbrind < 0 || 367 ttisp->tt_abbrind > sp->charcnt) 368 return -1; 369 } 370 for (i = 0; i < sp->charcnt; ++i) 371 sp->chars[i] = *p++; 372 sp->chars[i] = '\0'; /* ensure '\0' at end */ 373 for (i = 0; i < sp->leapcnt; ++i) { 374 register struct lsinfo * lsisp; 375 376 lsisp = &sp->lsis[i]; 377 lsisp->ls_trans = detzcode(p); 378 p += 4; 379 lsisp->ls_corr = detzcode(p); 380 p += 4; 381 } 382 for (i = 0; i < sp->typecnt; ++i) { 383 register struct ttinfo * ttisp; 384 385 ttisp = &sp->ttis[i]; 386 if (ttisstdcnt == 0) 387 ttisp->tt_ttisstd = FALSE; 388 else { 389 ttisp->tt_ttisstd = *p++; 390 if (ttisp->tt_ttisstd != TRUE && 391 ttisp->tt_ttisstd != FALSE) 392 return -1; 393 } 394 } 395 for (i = 0; i < sp->typecnt; ++i) { 396 register struct ttinfo * ttisp; 397 398 ttisp = &sp->ttis[i]; 399 if (ttisgmtcnt == 0) 400 ttisp->tt_ttisgmt = FALSE; 401 else { 402 ttisp->tt_ttisgmt = *p++; 403 if (ttisp->tt_ttisgmt != TRUE && 404 ttisp->tt_ttisgmt != FALSE) 405 return -1; 406 } 407 } 408 } 409 return 0; 410 } 411 412 static const int mon_lengths[2][MONSPERYEAR] = { 413 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 414 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } 415 }; 416 417 static const int year_lengths[2] = { 418 DAYSPERNYEAR, DAYSPERLYEAR 419 }; 420 421 /* 422 ** Given a pointer into a time zone string, scan until a character that is not 423 ** a valid character in a zone name is found. Return a pointer to that 424 ** character. 425 */ 426 427 static const char * 428 getzname(strp) 429 register const char * strp; 430 { 431 register char c; 432 433 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && 434 c != '+') 435 ++strp; 436 return strp; 437 } 438 439 /* 440 ** Given a pointer into a time zone string, extract a number from that string. 441 ** Check that the number is within a specified range; if it is not, return 442 ** NULL. 443 ** Otherwise, return a pointer to the first character not part of the number. 444 */ 445 446 static const char * 447 getnum(strp, nump, min, max) 448 register const char * strp; 449 int * const nump; 450 const int min; 451 const int max; 452 { 453 register char c; 454 register int num; 455 456 if (strp == NULL || !is_digit(c = *strp)) 457 return NULL; 458 num = 0; 459 do { 460 num = num * 10 + (c - '0'); 461 if (num > max) 462 return NULL; /* illegal value */ 463 c = *++strp; 464 } while (is_digit(c)); 465 if (num < min) 466 return NULL; /* illegal value */ 467 *nump = num; 468 return strp; 469 } 470 471 /* 472 ** Given a pointer into a time zone string, extract a number of seconds, 473 ** in hh[:mm[:ss]] form, from the string. 474 ** If any error occurs, return NULL. 475 ** Otherwise, return a pointer to the first character not part of the number 476 ** of seconds. 477 */ 478 479 static const char * 480 getsecs(strp, secsp) 481 register const char * strp; 482 long * const secsp; 483 { 484 int num; 485 486 /* 487 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like 488 ** "M10.4.6/26", which does not conform to Posix, 489 ** but which specifies the equivalent of 490 ** ``02:00 on the first Sunday on or after 23 Oct''. 491 */ 492 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); 493 if (strp == NULL) 494 return NULL; 495 *secsp = num * (long) SECSPERHOUR; 496 if (*strp == ':') { 497 ++strp; 498 strp = getnum(strp, &num, 0, MINSPERHOUR - 1); 499 if (strp == NULL) 500 return NULL; 501 *secsp += num * SECSPERMIN; 502 if (*strp == ':') { 503 ++strp; 504 /* `SECSPERMIN' allows for leap seconds. */ 505 strp = getnum(strp, &num, 0, SECSPERMIN); 506 if (strp == NULL) 507 return NULL; 508 *secsp += num; 509 } 510 } 511 return strp; 512 } 513 514 /* 515 ** Given a pointer into a time zone string, extract an offset, in 516 ** [+-]hh[:mm[:ss]] form, from the string. 517 ** If any error occurs, return NULL. 518 ** Otherwise, return a pointer to the first character not part of the time. 519 */ 520 521 static const char * 522 getoffset(strp, offsetp) 523 register const char * strp; 524 long * const offsetp; 525 { 526 register int neg = 0; 527 528 if (*strp == '-') { 529 neg = 1; 530 ++strp; 531 } else if (*strp == '+') 532 ++strp; 533 strp = getsecs(strp, offsetp); 534 if (strp == NULL) 535 return NULL; /* illegal time */ 536 if (neg) 537 *offsetp = -*offsetp; 538 return strp; 539 } 540 541 /* 542 ** Given a pointer into a time zone string, extract a rule in the form 543 ** date[/time]. See POSIX section 8 for the format of "date" and "time". 544 ** If a valid rule is not found, return NULL. 545 ** Otherwise, return a pointer to the first character not part of the rule. 546 */ 547 548 static const char * 549 getrule(strp, rulep) 550 const char * strp; 551 register struct rule * const rulep; 552 { 553 if (*strp == 'J') { 554 /* 555 ** Julian day. 556 */ 557 rulep->r_type = JULIAN_DAY; 558 ++strp; 559 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); 560 } else if (*strp == 'M') { 561 /* 562 ** Month, week, day. 563 */ 564 rulep->r_type = MONTH_NTH_DAY_OF_WEEK; 565 ++strp; 566 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); 567 if (strp == NULL) 568 return NULL; 569 if (*strp++ != '.') 570 return NULL; 571 strp = getnum(strp, &rulep->r_week, 1, 5); 572 if (strp == NULL) 573 return NULL; 574 if (*strp++ != '.') 575 return NULL; 576 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); 577 } else if (is_digit(*strp)) { 578 /* 579 ** Day of year. 580 */ 581 rulep->r_type = DAY_OF_YEAR; 582 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); 583 } else return NULL; /* invalid format */ 584 if (strp == NULL) 585 return NULL; 586 if (*strp == '/') { 587 /* 588 ** Time specified. 589 */ 590 ++strp; 591 strp = getsecs(strp, &rulep->r_time); 592 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ 593 return strp; 594 } 595 596 /* 597 ** Given the Epoch-relative time of January 1, 00:00:00 GMT, in a year, the 598 ** year, a rule, and the offset from GMT at the time that rule takes effect, 599 ** calculate the Epoch-relative time that rule takes effect. 600 */ 601 602 static time_t 603 transtime(janfirst, year, rulep, offset) 604 const time_t janfirst; 605 const int year; 606 register const struct rule * const rulep; 607 const long offset; 608 { 609 register int leapyear; 610 register time_t value; 611 register int i; 612 int d, m1, yy0, yy1, yy2, dow; 613 614 INITIALIZE(value); 615 leapyear = isleap(year); 616 switch (rulep->r_type) { 617 618 case JULIAN_DAY: 619 /* 620 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap 621 ** years. 622 ** In non-leap years, or if the day number is 59 or less, just 623 ** add SECSPERDAY times the day number-1 to the time of 624 ** January 1, midnight, to get the day. 625 */ 626 value = janfirst + (rulep->r_day - 1) * SECSPERDAY; 627 if (leapyear && rulep->r_day >= 60) 628 value += SECSPERDAY; 629 break; 630 631 case DAY_OF_YEAR: 632 /* 633 ** n - day of year. 634 ** Just add SECSPERDAY times the day number to the time of 635 ** January 1, midnight, to get the day. 636 */ 637 value = janfirst + rulep->r_day * SECSPERDAY; 638 break; 639 640 case MONTH_NTH_DAY_OF_WEEK: 641 /* 642 ** Mm.n.d - nth "dth day" of month m. 643 */ 644 value = janfirst; 645 for (i = 0; i < rulep->r_mon - 1; ++i) 646 value += mon_lengths[leapyear][i] * SECSPERDAY; 647 648 /* 649 ** Use Zeller's Congruence to get day-of-week of first day of 650 ** month. 651 */ 652 m1 = (rulep->r_mon + 9) % 12 + 1; 653 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; 654 yy1 = yy0 / 100; 655 yy2 = yy0 % 100; 656 dow = ((26 * m1 - 2) / 10 + 657 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; 658 if (dow < 0) 659 dow += DAYSPERWEEK; 660 661 /* 662 ** "dow" is the day-of-week of the first day of the month. Get 663 ** the day-of-month (zero-origin) of the first "dow" day of the 664 ** month. 665 */ 666 d = rulep->r_day - dow; 667 if (d < 0) 668 d += DAYSPERWEEK; 669 for (i = 1; i < rulep->r_week; ++i) { 670 if (d + DAYSPERWEEK >= 671 mon_lengths[leapyear][rulep->r_mon - 1]) 672 break; 673 d += DAYSPERWEEK; 674 } 675 676 /* 677 ** "d" is the day-of-month (zero-origin) of the day we want. 678 */ 679 value += d * SECSPERDAY; 680 break; 681 } 682 683 /* 684 ** "value" is the Epoch-relative time of 00:00:00 GMT on the day in 685 ** question. To get the Epoch-relative time of the specified local 686 ** time on that day, add the transition time and the current offset 687 ** from GMT. 688 */ 689 return value + rulep->r_time + offset; 690 } 691 692 /* 693 ** Given a POSIX section 8-style TZ string, fill in the rule tables as 694 ** appropriate. 695 */ 696 697 static int 698 tzparse(name, sp, lastditch) 699 const char * name; 700 register struct state * const sp; 701 const int lastditch; 702 { 703 const char * stdname; 704 const char * dstname; 705 size_t stdlen; 706 size_t dstlen; 707 long stdoffset; 708 long dstoffset; 709 register time_t * atp; 710 register unsigned char * typep; 711 register char * cp; 712 register int load_result; 713 714 INITIALIZE(dstname); 715 stdname = name; 716 if (lastditch) { 717 stdlen = strlen(name); /* length of standard zone name */ 718 name += stdlen; 719 if (stdlen >= sizeof sp->chars) 720 stdlen = (sizeof sp->chars) - 1; 721 } else { 722 name = getzname(name); 723 stdlen = name - stdname; 724 if (stdlen < 3) 725 return -1; 726 } 727 if (*name == '\0') 728 return -1; /* was "stdoffset = 0;" */ 729 else { 730 name = getoffset(name, &stdoffset); 731 if (name == NULL) 732 return -1; 733 } 734 load_result = tzload(TZDEFRULES, sp); 735 if (load_result != 0) 736 sp->leapcnt = 0; /* so, we're off a little */ 737 if (*name != '\0') { 738 dstname = name; 739 name = getzname(name); 740 dstlen = name - dstname; /* length of DST zone name */ 741 if (dstlen < 3) 742 return -1; 743 if (*name != '\0' && *name != ',' && *name != ';') { 744 name = getoffset(name, &dstoffset); 745 if (name == NULL) 746 return -1; 747 } else dstoffset = stdoffset - SECSPERHOUR; 748 if (*name == ',' || *name == ';') { 749 struct rule start; 750 struct rule end; 751 register int year; 752 register time_t janfirst; 753 time_t starttime; 754 time_t endtime; 755 756 ++name; 757 if ((name = getrule(name, &start)) == NULL) 758 return -1; 759 if (*name++ != ',') 760 return -1; 761 if ((name = getrule(name, &end)) == NULL) 762 return -1; 763 if (*name != '\0') 764 return -1; 765 sp->typecnt = 2; /* standard time and DST */ 766 /* 767 ** Two transitions per year, from EPOCH_YEAR to 2037. 768 */ 769 sp->timecnt = 2 * (2037 - EPOCH_YEAR + 1); 770 if (sp->timecnt > TZ_MAX_TIMES) 771 return -1; 772 sp->ttis[0].tt_gmtoff = -dstoffset; 773 sp->ttis[0].tt_isdst = 1; 774 sp->ttis[0].tt_abbrind = stdlen + 1; 775 sp->ttis[1].tt_gmtoff = -stdoffset; 776 sp->ttis[1].tt_isdst = 0; 777 sp->ttis[1].tt_abbrind = 0; 778 atp = sp->ats; 779 typep = sp->types; 780 janfirst = 0; 781 for (year = EPOCH_YEAR; year <= 2037; ++year) { 782 starttime = transtime(janfirst, year, &start, 783 stdoffset); 784 endtime = transtime(janfirst, year, &end, 785 dstoffset); 786 if (starttime > endtime) { 787 *atp++ = endtime; 788 *typep++ = 1; /* DST ends */ 789 *atp++ = starttime; 790 *typep++ = 0; /* DST begins */ 791 } else { 792 *atp++ = starttime; 793 *typep++ = 0; /* DST begins */ 794 *atp++ = endtime; 795 *typep++ = 1; /* DST ends */ 796 } 797 janfirst += year_lengths[isleap(year)] * 798 SECSPERDAY; 799 } 800 } else { 801 register long theirstdoffset; 802 register long theirdstoffset; 803 register long theiroffset; 804 register int isdst; 805 register int i; 806 register int j; 807 808 if (*name != '\0') 809 return -1; 810 if (load_result != 0) 811 return -1; 812 /* 813 ** Initial values of theirstdoffset and theirdstoffset. 814 */ 815 theirstdoffset = 0; 816 for (i = 0; i < sp->timecnt; ++i) { 817 j = sp->types[i]; 818 if (!sp->ttis[j].tt_isdst) { 819 theirstdoffset = 820 -sp->ttis[j].tt_gmtoff; 821 break; 822 } 823 } 824 theirdstoffset = 0; 825 for (i = 0; i < sp->timecnt; ++i) { 826 j = sp->types[i]; 827 if (sp->ttis[j].tt_isdst) { 828 theirdstoffset = 829 -sp->ttis[j].tt_gmtoff; 830 break; 831 } 832 } 833 /* 834 ** Initially we're assumed to be in standard time. 835 */ 836 isdst = FALSE; 837 theiroffset = theirstdoffset; 838 /* 839 ** Now juggle transition times and types 840 ** tracking offsets as you do. 841 */ 842 for (i = 0; i < sp->timecnt; ++i) { 843 j = sp->types[i]; 844 sp->types[i] = sp->ttis[j].tt_isdst; 845 if (sp->ttis[j].tt_ttisgmt) { 846 /* No adjustment to transition time */ 847 } else { 848 /* 849 ** If summer time is in effect, and the 850 ** transition time was not specified as 851 ** standard time, add the summer time 852 ** offset to the transition time; 853 ** otherwise, add the standard time 854 ** offset to the transition time. 855 */ 856 /* 857 ** Transitions from DST to DDST 858 ** will effectively disappear since 859 ** POSIX provides for only one DST 860 ** offset. 861 */ 862 if (isdst && !sp->ttis[j].tt_ttisstd) { 863 sp->ats[i] += dstoffset - 864 theirdstoffset; 865 } else { 866 sp->ats[i] += stdoffset - 867 theirstdoffset; 868 } 869 } 870 theiroffset = -sp->ttis[j].tt_gmtoff; 871 if (sp->ttis[j].tt_isdst) 872 theirdstoffset = theiroffset; 873 else theirstdoffset = theiroffset; 874 } 875 /* 876 ** Finally, fill in ttis. 877 ** ttisstd and ttisgmt need not be handled. 878 */ 879 sp->ttis[0].tt_gmtoff = -stdoffset; 880 sp->ttis[0].tt_isdst = FALSE; 881 sp->ttis[0].tt_abbrind = 0; 882 sp->ttis[1].tt_gmtoff = -dstoffset; 883 sp->ttis[1].tt_isdst = TRUE; 884 sp->ttis[1].tt_abbrind = stdlen + 1; 885 } 886 } else { 887 dstlen = 0; 888 sp->typecnt = 1; /* only standard time */ 889 sp->timecnt = 0; 890 sp->ttis[0].tt_gmtoff = -stdoffset; 891 sp->ttis[0].tt_isdst = 0; 892 sp->ttis[0].tt_abbrind = 0; 893 } 894 sp->charcnt = stdlen + 1; 895 if (dstlen != 0) 896 sp->charcnt += dstlen + 1; 897 if (sp->charcnt > sizeof sp->chars) 898 return -1; 899 cp = sp->chars; 900 (void) strncpy(cp, stdname, stdlen); 901 cp += stdlen; 902 *cp++ = '\0'; 903 if (dstlen != 0) { 904 (void) strncpy(cp, dstname, dstlen); 905 *(cp + dstlen) = '\0'; 906 } 907 return 0; 908 } 909 910 static void 911 gmtload(sp) 912 struct state * const sp; 913 { 914 if (tzload(gmt, sp) != 0) 915 (void) tzparse(gmt, sp, TRUE); 916 } 917 918 #ifndef STD_INSPIRED 919 /* 920 ** A non-static declaration of tzsetwall in a system header file 921 ** may cause a warning about this upcoming static declaration... 922 */ 923 static 924 #endif /* !defined STD_INSPIRED */ 925 void 926 tzsetwall P((void)) 927 { 928 if (lcl_is_set < 0) 929 return; 930 lcl_is_set = -1; 931 932 #ifdef ALL_STATE 933 if (lclptr == NULL) { 934 lclptr = (struct state *) malloc(sizeof *lclptr); 935 if (lclptr == NULL) { 936 settzname(); /* all we can do */ 937 return; 938 } 939 } 940 #endif /* defined ALL_STATE */ 941 if (tzload((char *) NULL, lclptr) != 0) 942 gmtload(lclptr); 943 settzname(); 944 } 945 946 void 947 tzset P((void)) 948 { 949 register const char * name; 950 951 name = getenv("TZ"); 952 if (name == NULL) { 953 tzsetwall(); 954 return; 955 } 956 957 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) 958 return; 959 lcl_is_set = (strlen(name) < sizeof(lcl_TZname)); 960 if (lcl_is_set) 961 (void) strcpy(lcl_TZname, name); 962 963 #ifdef ALL_STATE 964 if (lclptr == NULL) { 965 lclptr = (struct state *) malloc(sizeof *lclptr); 966 if (lclptr == NULL) { 967 settzname(); /* all we can do */ 968 return; 969 } 970 } 971 #endif /* defined ALL_STATE */ 972 if (*name == '\0') { 973 /* 974 ** User wants it fast rather than right. 975 */ 976 lclptr->leapcnt = 0; /* so, we're off a little */ 977 lclptr->timecnt = 0; 978 lclptr->ttis[0].tt_gmtoff = 0; 979 lclptr->ttis[0].tt_abbrind = 0; 980 (void) strcpy(lclptr->chars, gmt); 981 } else if (tzload(name, lclptr) != 0) 982 if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0) 983 (void) gmtload(lclptr); 984 settzname(); 985 } 986 987 /* 988 ** The easy way to behave "as if no library function calls" localtime 989 ** is to not call it--so we drop its guts into "localsub", which can be 990 ** freely called. (And no, the PANS doesn't require the above behavior-- 991 ** but it *is* desirable.) 992 ** 993 ** The unused offset argument is for the benefit of mktime variants. 994 */ 995 996 /*ARGSUSED*/ 997 static void 998 localsub(timep, offset, tmp) 999 const time_t * const timep; 1000 const long offset; 1001 struct tm * const tmp; 1002 { 1003 register struct state * sp; 1004 register const struct ttinfo * ttisp; 1005 register int i; 1006 const time_t t = *timep; 1007 1008 sp = lclptr; 1009 #ifdef ALL_STATE 1010 if (sp == NULL) { 1011 gmtsub(timep, offset, tmp); 1012 return; 1013 } 1014 #endif /* defined ALL_STATE */ 1015 if (sp->timecnt == 0 || t < sp->ats[0]) { 1016 i = 0; 1017 while (sp->ttis[i].tt_isdst) 1018 if (++i >= sp->typecnt) { 1019 i = 0; 1020 break; 1021 } 1022 } else { 1023 for (i = 1; i < sp->timecnt; ++i) 1024 if (t < sp->ats[i]) 1025 break; 1026 i = sp->types[i - 1]; 1027 } 1028 ttisp = &sp->ttis[i]; 1029 /* 1030 ** To get (wrong) behavior that's compatible with System V Release 2.0 1031 ** you'd replace the statement below with 1032 ** t += ttisp->tt_gmtoff; 1033 ** timesub(&t, 0L, sp, tmp); 1034 */ 1035 timesub(&t, ttisp->tt_gmtoff, sp, tmp); 1036 tmp->tm_isdst = ttisp->tt_isdst; 1037 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; 1038 #ifdef TM_ZONE 1039 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; 1040 #endif /* defined TM_ZONE */ 1041 } 1042 1043 struct tm * 1044 localtime(timep) 1045 const time_t * const timep; 1046 { 1047 tzset(); 1048 localsub(timep, 0L, &tm); 1049 return &tm; 1050 } 1051 1052 /* 1053 ** gmtsub is to gmtime as localsub is to localtime. 1054 */ 1055 1056 static void 1057 gmtsub(timep, offset, tmp) 1058 const time_t * const timep; 1059 const long offset; 1060 struct tm * const tmp; 1061 { 1062 if (!gmt_is_set) { 1063 gmt_is_set = TRUE; 1064 #ifdef ALL_STATE 1065 gmtptr = (struct state *) malloc(sizeof *gmtptr); 1066 if (gmtptr != NULL) 1067 #endif /* defined ALL_STATE */ 1068 gmtload(gmtptr); 1069 } 1070 timesub(timep, offset, gmtptr, tmp); 1071 #ifdef TM_ZONE 1072 /* 1073 ** Could get fancy here and deliver something such as 1074 ** "GMT+xxxx" or "GMT-xxxx" if offset is non-zero, 1075 ** but this is no time for a treasure hunt. 1076 */ 1077 if (offset != 0) 1078 tmp->TM_ZONE = wildabbr; 1079 else { 1080 #ifdef ALL_STATE 1081 if (gmtptr == NULL) 1082 tmp->TM_ZONE = gmt; 1083 else tmp->TM_ZONE = gmtptr->chars; 1084 #endif /* defined ALL_STATE */ 1085 #ifndef ALL_STATE 1086 tmp->TM_ZONE = gmtptr->chars; 1087 #endif /* State Farm */ 1088 } 1089 #endif /* defined TM_ZONE */ 1090 } 1091 1092 struct tm * 1093 gmtime(timep) 1094 const time_t * const timep; 1095 { 1096 gmtsub(timep, 0L, &tm); 1097 return &tm; 1098 } 1099 1100 #ifdef STD_INSPIRED 1101 1102 struct tm * 1103 offtime(timep, offset) 1104 const time_t * const timep; 1105 const long offset; 1106 { 1107 gmtsub(timep, offset, &tm); 1108 return &tm; 1109 } 1110 1111 #endif /* defined STD_INSPIRED */ 1112 1113 static void 1114 timesub(timep, offset, sp, tmp) 1115 const time_t * const timep; 1116 const long offset; 1117 register const struct state * const sp; 1118 register struct tm * const tmp; 1119 { 1120 register const struct lsinfo * lp; 1121 register long days; 1122 register long rem; 1123 register int y; 1124 register int yleap; 1125 register const int * ip; 1126 register long corr; 1127 register int hit; 1128 register int i; 1129 1130 corr = 0; 1131 hit = 0; 1132 #ifdef ALL_STATE 1133 i = (sp == NULL) ? 0 : sp->leapcnt; 1134 #endif /* defined ALL_STATE */ 1135 #ifndef ALL_STATE 1136 i = sp->leapcnt; 1137 #endif /* State Farm */ 1138 while (--i >= 0) { 1139 lp = &sp->lsis[i]; 1140 if (*timep >= lp->ls_trans) { 1141 if (*timep == lp->ls_trans) { 1142 hit = ((i == 0 && lp->ls_corr > 0) || 1143 lp->ls_corr > sp->lsis[i - 1].ls_corr); 1144 if (hit) 1145 while (i > 0 && 1146 sp->lsis[i].ls_trans == 1147 sp->lsis[i - 1].ls_trans + 1 && 1148 sp->lsis[i].ls_corr == 1149 sp->lsis[i - 1].ls_corr + 1) { 1150 ++hit; 1151 --i; 1152 } 1153 } 1154 corr = lp->ls_corr; 1155 break; 1156 } 1157 } 1158 days = *timep / SECSPERDAY; 1159 rem = *timep % SECSPERDAY; 1160 #ifdef mc68k 1161 if (*timep == 0x80000000) { 1162 /* 1163 ** A 3B1 muffs the division on the most negative number. 1164 */ 1165 days = -24855; 1166 rem = -11648; 1167 } 1168 #endif /* defined mc68k */ 1169 rem += (offset - corr); 1170 while (rem < 0) { 1171 rem += SECSPERDAY; 1172 --days; 1173 } 1174 while (rem >= SECSPERDAY) { 1175 rem -= SECSPERDAY; 1176 ++days; 1177 } 1178 tmp->tm_hour = (int) (rem / SECSPERHOUR); 1179 rem = rem % SECSPERHOUR; 1180 tmp->tm_min = (int) (rem / SECSPERMIN); 1181 /* 1182 ** A positive leap second requires a special 1183 ** representation. This uses "... ??:59:60" et seq. 1184 */ 1185 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; 1186 tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK); 1187 if (tmp->tm_wday < 0) 1188 tmp->tm_wday += DAYSPERWEEK; 1189 y = EPOCH_YEAR; 1190 #define LEAPS_THRU_END_OF(y) ((y) / 4 - (y) / 100 + (y) / 400) 1191 while (days < 0 || days >= (long) year_lengths[yleap = isleap(y)]) { 1192 register int newy; 1193 1194 newy = y + days / DAYSPERNYEAR; 1195 if (days < 0) 1196 --newy; 1197 days -= (newy - y) * DAYSPERNYEAR + 1198 LEAPS_THRU_END_OF(newy - 1) - 1199 LEAPS_THRU_END_OF(y - 1); 1200 y = newy; 1201 } 1202 tmp->tm_year = y - TM_YEAR_BASE; 1203 tmp->tm_yday = (int) days; 1204 ip = mon_lengths[yleap]; 1205 for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon)) 1206 days = days - (long) ip[tmp->tm_mon]; 1207 tmp->tm_mday = (int) (days + 1); 1208 tmp->tm_isdst = 0; 1209 #ifdef TM_GMTOFF 1210 tmp->TM_GMTOFF = offset; 1211 #endif /* defined TM_GMTOFF */ 1212 } 1213 1214 char * 1215 ctime(timep) 1216 const time_t * const timep; 1217 { 1218 /* 1219 ** Section 4.12.3.2 of X3.159-1989 requires that 1220 ** The ctime funciton converts the calendar time pointed to by timer 1221 ** to local time in the form of a string. It is equivalent to 1222 ** asctime(localtime(timer)) 1223 */ 1224 return asctime(localtime(timep)); 1225 } 1226 1227 /* 1228 ** Adapted from code provided by Robert Elz, who writes: 1229 ** The "best" way to do mktime I think is based on an idea of Bob 1230 ** Kridle's (so its said...) from a long time ago. (mtxinu!kridle now). 1231 ** It does a binary search of the time_t space. Since time_t's are 1232 ** just 32 bits, its a max of 32 iterations (even at 64 bits it 1233 ** would still be very reasonable). 1234 */ 1235 1236 #ifndef WRONG 1237 #define WRONG (-1) 1238 #endif /* !defined WRONG */ 1239 1240 /* 1241 ** Simplified normalize logic courtesy Paul Eggert (eggert (at) twinsun.com). 1242 */ 1243 1244 static int 1245 increment_overflow(number, delta) 1246 int * number; 1247 int delta; 1248 { 1249 int number0; 1250 1251 number0 = *number; 1252 *number += delta; 1253 return (*number < number0) != (delta < 0); 1254 } 1255 1256 static int 1257 normalize_overflow(tensptr, unitsptr, base) 1258 int * const tensptr; 1259 int * const unitsptr; 1260 const int base; 1261 { 1262 register int tensdelta; 1263 1264 tensdelta = (*unitsptr >= 0) ? 1265 (*unitsptr / base) : 1266 (-1 - (-1 - *unitsptr) / base); 1267 *unitsptr -= tensdelta * base; 1268 return increment_overflow(tensptr, tensdelta); 1269 } 1270 1271 static int 1272 tmcomp(atmp, btmp) 1273 register const struct tm * const atmp; 1274 register const struct tm * const btmp; 1275 { 1276 register int result; 1277 1278 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && 1279 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && 1280 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && 1281 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && 1282 (result = (atmp->tm_min - btmp->tm_min)) == 0) 1283 result = atmp->tm_sec - btmp->tm_sec; 1284 return result; 1285 } 1286 1287 static time_t 1288 time2(tmp, funcp, offset, okayp) 1289 struct tm * const tmp; 1290 void (* const funcp) P((const time_t*, long, struct tm*)); 1291 const long offset; 1292 int * const okayp; 1293 { 1294 register const struct state * sp; 1295 register int dir; 1296 register int bits; 1297 register int i, j ; 1298 register int saved_seconds; 1299 time_t newt; 1300 time_t t; 1301 struct tm yourtm, mytm; 1302 1303 *okayp = FALSE; 1304 yourtm = *tmp; 1305 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) 1306 return WRONG; 1307 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) 1308 return WRONG; 1309 if (normalize_overflow(&yourtm.tm_year, &yourtm.tm_mon, MONSPERYEAR)) 1310 return WRONG; 1311 /* 1312 ** Turn yourtm.tm_year into an actual year number for now. 1313 ** It is converted back to an offset from TM_YEAR_BASE later. 1314 */ 1315 if (increment_overflow(&yourtm.tm_year, TM_YEAR_BASE)) 1316 return WRONG; 1317 while (yourtm.tm_mday <= 0) { 1318 if (increment_overflow(&yourtm.tm_year, -1)) 1319 return WRONG; 1320 yourtm.tm_mday += year_lengths[isleap(yourtm.tm_year)]; 1321 } 1322 while (yourtm.tm_mday > DAYSPERLYEAR) { 1323 yourtm.tm_mday -= year_lengths[isleap(yourtm.tm_year)]; 1324 if (increment_overflow(&yourtm.tm_year, 1)) 1325 return WRONG; 1326 } 1327 for ( ; ; ) { 1328 i = mon_lengths[isleap(yourtm.tm_year)][yourtm.tm_mon]; 1329 if (yourtm.tm_mday <= i) 1330 break; 1331 yourtm.tm_mday -= i; 1332 if (++yourtm.tm_mon >= MONSPERYEAR) { 1333 yourtm.tm_mon = 0; 1334 if (increment_overflow(&yourtm.tm_year, 1)) 1335 return WRONG; 1336 } 1337 } 1338 if (increment_overflow(&yourtm.tm_year, -TM_YEAR_BASE)) 1339 return WRONG; 1340 if (yourtm.tm_year + TM_YEAR_BASE < EPOCH_YEAR) { 1341 /* 1342 ** We can't set tm_sec to 0, because that might push the 1343 ** time below the minimum representable time. 1344 ** Set tm_sec to 59 instead. 1345 ** This assumes that the minimum representable time is 1346 ** not in the same minute that a leap second was deleted from, 1347 ** which is a safer assumption than using 58 would be. 1348 */ 1349 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) 1350 return WRONG; 1351 saved_seconds = yourtm.tm_sec; 1352 yourtm.tm_sec = SECSPERMIN - 1; 1353 } else { 1354 saved_seconds = yourtm.tm_sec; 1355 yourtm.tm_sec = 0; 1356 } 1357 /* 1358 ** Divide the search space in half 1359 ** (this works whether time_t is signed or unsigned). 1360 */ 1361 bits = TYPE_BIT(time_t) - 1; 1362 /* 1363 ** If time_t is signed, then 0 is just above the median, 1364 ** assuming two's complement arithmetic. 1365 ** If time_t is unsigned, then (1 << bits) is just above the median. 1366 */ 1367 t = TYPE_SIGNED(time_t) ? 0 : (((time_t) 1) << bits); 1368 for ( ; ; ) { 1369 (*funcp)(&t, offset, &mytm); 1370 dir = tmcomp(&mytm, &yourtm); 1371 if (dir != 0) { 1372 if (bits-- < 0) 1373 return WRONG; 1374 if (bits < 0) 1375 --t; /* may be needed if new t is minimal */ 1376 else if (dir > 0) 1377 t -= ((time_t) 1) << bits; 1378 else t += ((time_t) 1) << bits; 1379 continue; 1380 } 1381 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) 1382 break; 1383 /* 1384 ** Right time, wrong type. 1385 ** Hunt for right time, right type. 1386 ** It's okay to guess wrong since the guess 1387 ** gets checked. 1388 */ 1389 /* 1390 ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. 1391 */ 1392 sp = (const struct state *) 1393 (((void *) funcp == (void *) localsub) ? 1394 lclptr : gmtptr); 1395 #ifdef ALL_STATE 1396 if (sp == NULL) 1397 return WRONG; 1398 #endif /* defined ALL_STATE */ 1399 for (i = sp->typecnt - 1; i >= 0; --i) { 1400 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) 1401 continue; 1402 for (j = sp->typecnt - 1; j >= 0; --j) { 1403 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) 1404 continue; 1405 newt = t + sp->ttis[j].tt_gmtoff - 1406 sp->ttis[i].tt_gmtoff; 1407 (*funcp)(&newt, offset, &mytm); 1408 if (tmcomp(&mytm, &yourtm) != 0) 1409 continue; 1410 if (mytm.tm_isdst != yourtm.tm_isdst) 1411 continue; 1412 /* 1413 ** We have a match. 1414 */ 1415 t = newt; 1416 goto label; 1417 } 1418 } 1419 return WRONG; 1420 } 1421 label: 1422 newt = t + saved_seconds; 1423 if ((newt < t) != (saved_seconds < 0)) 1424 return WRONG; 1425 t = newt; 1426 (*funcp)(&t, offset, tmp); 1427 *okayp = TRUE; 1428 return t; 1429 } 1430 1431 static time_t 1432 time1(tmp, funcp, offset) 1433 struct tm * const tmp; 1434 void (* const funcp) P((const time_t *, long, struct tm *)); 1435 const long offset; 1436 { 1437 register time_t t; 1438 register const struct state * sp; 1439 register int samei, otheri; 1440 int okay; 1441 1442 if (tmp->tm_isdst > 1) 1443 tmp->tm_isdst = 1; 1444 t = time2(tmp, funcp, offset, &okay); 1445 #ifdef PCTS 1446 /* 1447 ** PCTS code courtesy Grant Sullivan (grant (at) osf.org). 1448 */ 1449 if (okay) 1450 return t; 1451 if (tmp->tm_isdst < 0) 1452 tmp->tm_isdst = 0; /* reset to std and try again */ 1453 #endif /* defined PCTS */ 1454 #ifndef PCTS 1455 if (okay || tmp->tm_isdst < 0) 1456 return t; 1457 #endif /* !defined PCTS */ 1458 /* 1459 ** We're supposed to assume that somebody took a time of one type 1460 ** and did some math on it that yielded a "struct tm" that's bad. 1461 ** We try to divine the type they started from and adjust to the 1462 ** type they need. 1463 */ 1464 /* 1465 ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. 1466 */ 1467 sp = (const struct state *) (((void *) funcp == (void *) localsub) ? 1468 lclptr : gmtptr); 1469 #ifdef ALL_STATE 1470 if (sp == NULL) 1471 return WRONG; 1472 #endif /* defined ALL_STATE */ 1473 for (samei = sp->typecnt - 1; samei >= 0; --samei) { 1474 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) 1475 continue; 1476 for (otheri = sp->typecnt - 1; otheri >= 0; --otheri) { 1477 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) 1478 continue; 1479 tmp->tm_sec += sp->ttis[otheri].tt_gmtoff - 1480 sp->ttis[samei].tt_gmtoff; 1481 tmp->tm_isdst = !tmp->tm_isdst; 1482 t = time2(tmp, funcp, offset, &okay); 1483 if (okay) 1484 return t; 1485 tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff - 1486 sp->ttis[samei].tt_gmtoff; 1487 tmp->tm_isdst = !tmp->tm_isdst; 1488 } 1489 } 1490 return WRONG; 1491 } 1492 1493 time_t 1494 mktime(tmp) 1495 struct tm * const tmp; 1496 { 1497 tzset(); 1498 return time1(tmp, localsub, 0L); 1499 } 1500 1501 #ifdef STD_INSPIRED 1502 1503 time_t 1504 timelocal(tmp) 1505 struct tm * const tmp; 1506 { 1507 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 1508 return mktime(tmp); 1509 } 1510 1511 time_t 1512 timegm(tmp) 1513 struct tm * const tmp; 1514 { 1515 tmp->tm_isdst = 0; 1516 return time1(tmp, gmtsub, 0L); 1517 } 1518 1519 time_t 1520 timeoff(tmp, offset) 1521 struct tm * const tmp; 1522 const long offset; 1523 { 1524 tmp->tm_isdst = 0; 1525 return time1(tmp, gmtsub, offset); 1526 } 1527 1528 #endif /* defined STD_INSPIRED */ 1529 1530 #ifdef CMUCS 1531 1532 /* 1533 ** The following is supplied for compatibility with 1534 ** previous versions of the CMUCS runtime library. 1535 */ 1536 1537 long 1538 gtime(tmp) 1539 struct tm * const tmp; 1540 { 1541 const time_t t = mktime(tmp); 1542 1543 if (t == WRONG) 1544 return -1; 1545 return t; 1546 } 1547 1548 #endif /* defined CMUCS */ 1549 1550 /* 1551 ** XXX--is the below the right way to conditionalize?? 1552 */ 1553 1554 #ifdef STD_INSPIRED 1555 1556 /* 1557 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 1558 ** shall correspond to "Wed Dec 31 23:59:59 GMT 1986", which 1559 ** is not the case if we are accounting for leap seconds. 1560 ** So, we provide the following conversion routines for use 1561 ** when exchanging timestamps with POSIX conforming systems. 1562 */ 1563 1564 static long 1565 leapcorr(timep) 1566 time_t * timep; 1567 { 1568 register struct state * sp; 1569 register struct lsinfo * lp; 1570 register int i; 1571 1572 sp = lclptr; 1573 i = sp->leapcnt; 1574 while (--i >= 0) { 1575 lp = &sp->lsis[i]; 1576 if (*timep >= lp->ls_trans) 1577 return lp->ls_corr; 1578 } 1579 return 0; 1580 } 1581 1582 time_t 1583 time2posix(t) 1584 time_t t; 1585 { 1586 tzset(); 1587 return t - leapcorr(&t); 1588 } 1589 1590 time_t 1591 posix2time(t) 1592 time_t t; 1593 { 1594 time_t x; 1595 time_t y; 1596 1597 tzset(); 1598 /* 1599 ** For a positive leap second hit, the result 1600 ** is not unique. For a negative leap second 1601 ** hit, the corresponding time doesn't exist, 1602 ** so we return an adjacent second. 1603 */ 1604 x = t + leapcorr(&t); 1605 y = x - leapcorr(&x); 1606 if (y < t) { 1607 do { 1608 x++; 1609 y = x - leapcorr(&x); 1610 } while (y < t); 1611 if (t != y) 1612 return x - 1; 1613 } else if (y > t) { 1614 do { 1615 --x; 1616 y = x - leapcorr(&x); 1617 } while (y > t); 1618 if (t != y) 1619 return x + 1; 1620 } 1621 return x; 1622 } 1623 1624 #endif /* defined STD_INSPIRED */ 1625
Indexes created Thu Oct 02 10:09:58 GMT 2025