localtime.c revision 1.69
1 /* $NetBSD: localtime.c,v 1.69 2012/10/26 18:31:14 christos Exp $ */ 2 3 /* 4 ** This file is in the public domain, so clarified as of 5 ** 1996-06-05 by Arthur David Olson. 6 */ 7 8 #include <sys/cdefs.h> 9 #if defined(LIBC_SCCS) && !defined(lint) 10 #if 0 11 static char elsieid[] = "@(#)localtime.c 8.17"; 12 #else 13 __RCSID("$NetBSD: localtime.c,v 1.69 2012/10/26 18:31:14 christos Exp $"); 14 #endif 15 #endif /* LIBC_SCCS and not lint */ 16 17 /* 18 ** Leap second handling from Bradley White. 19 ** POSIX-style TZ environment variable handling from Guy Harris. 20 */ 21 22 /*LINTLIBRARY*/ 23 24 #include "namespace.h" 25 #include "private.h" 26 #include "tzfile.h" 27 #include "fcntl.h" 28 #include "reentrant.h" 29 30 #if defined(__weak_alias) 31 __weak_alias(daylight,_daylight) 32 __weak_alias(tzname,_tzname) 33 #endif 34 35 #include "float.h" /* for FLT_MAX and DBL_MAX */ 36 37 #ifndef TZ_ABBR_MAX_LEN 38 #define TZ_ABBR_MAX_LEN 16 39 #endif /* !defined TZ_ABBR_MAX_LEN */ 40 41 #ifndef TZ_ABBR_CHAR_SET 42 #define TZ_ABBR_CHAR_SET \ 43 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._" 44 #endif /* !defined TZ_ABBR_CHAR_SET */ 45 46 #ifndef TZ_ABBR_ERR_CHAR 47 #define TZ_ABBR_ERR_CHAR '_' 48 #endif /* !defined TZ_ABBR_ERR_CHAR */ 49 50 /* 51 ** SunOS 4.1.1 headers lack O_BINARY. 52 */ 53 54 #ifdef O_BINARY 55 #define OPEN_MODE (O_RDONLY | O_BINARY) 56 #endif /* defined O_BINARY */ 57 #ifndef O_BINARY 58 #define OPEN_MODE O_RDONLY 59 #endif /* !defined O_BINARY */ 60 61 #ifndef WILDABBR 62 /* 63 ** Someone might make incorrect use of a time zone abbreviation: 64 ** 1. They might reference tzname[0] before calling tzset (explicitly 65 ** or implicitly). 66 ** 2. They might reference tzname[1] before calling tzset (explicitly 67 ** or implicitly). 68 ** 3. They might reference tzname[1] after setting to a time zone 69 ** in which Daylight Saving Time is never observed. 70 ** 4. They might reference tzname[0] after setting to a time zone 71 ** in which Standard Time is never observed. 72 ** 5. They might reference tm.TM_ZONE after calling offtime. 73 ** What's best to do in the above cases is open to debate; 74 ** for now, we just set things up so that in any of the five cases 75 ** WILDABBR is used. Another possibility: initialize tzname[0] to the 76 ** string "tzname[0] used before set", and similarly for the other cases. 77 ** And another: initialize tzname[0] to "ERA", with an explanation in the 78 ** manual page of what this "time zone abbreviation" means (doing this so 79 ** that tzname[0] has the "normal" length of three characters). 80 */ 81 #define WILDABBR " " 82 #endif /* !defined WILDABBR */ 83 84 static const char wildabbr[] = WILDABBR; 85 86 static char gmt[] = "GMT"; 87 88 /* 89 ** The DST rules to use if TZ has no rules and we can't load TZDEFRULES. 90 ** We default to US rules as of 1999-08-17. 91 ** POSIX 1003.1 section 8.1.1 says that the default DST rules are 92 ** implementation dependent; for historical reasons, US rules are a 93 ** common default. 94 */ 95 #ifndef TZDEFRULESTRING 96 #define TZDEFRULESTRING ",M4.1.0,M10.5.0" 97 #endif /* !defined TZDEFDST */ 98 99 struct ttinfo { /* time type information */ 100 long tt_gmtoff; /* UTC offset in seconds */ 101 int tt_isdst; /* used to set tm_isdst */ 102 int tt_abbrind; /* abbreviation list index */ 103 int tt_ttisstd; /* TRUE if transition is std time */ 104 int tt_ttisgmt; /* TRUE if transition is UTC */ 105 }; 106 107 struct lsinfo { /* leap second information */ 108 time_t ls_trans; /* transition time */ 109 long ls_corr; /* correction to apply */ 110 }; 111 112 #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) 113 114 #ifdef TZNAME_MAX 115 #define MY_TZNAME_MAX TZNAME_MAX 116 #endif /* defined TZNAME_MAX */ 117 #ifndef TZNAME_MAX 118 #define MY_TZNAME_MAX 255 119 #endif /* !defined TZNAME_MAX */ 120 121 struct __state { 122 int leapcnt; 123 int timecnt; 124 int typecnt; 125 int charcnt; 126 int goback; 127 int goahead; 128 time_t ats[TZ_MAX_TIMES]; 129 unsigned char types[TZ_MAX_TIMES]; 130 struct ttinfo ttis[TZ_MAX_TYPES]; 131 char chars[/*CONSTCOND*/BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, 132 sizeof gmt), (2 * (MY_TZNAME_MAX + 1)))]; 133 struct lsinfo lsis[TZ_MAX_LEAPS]; 134 }; 135 136 struct rule { 137 int r_type; /* type of rule--see below */ 138 int r_day; /* day number of rule */ 139 int r_week; /* week number of rule */ 140 int r_mon; /* month number of rule */ 141 long r_time; /* transition time of rule */ 142 }; 143 144 #define JULIAN_DAY 0 /* Jn - Julian day */ 145 #define DAY_OF_YEAR 1 /* n - day of year */ 146 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */ 147 148 typedef struct tm *(*subfun_t)(const timezone_t sp, const time_t *timep, 149 long offset, struct tm *tmp); 150 151 /* 152 ** Prototypes for static functions. 153 */ 154 155 static long detzcode(const char * codep); 156 static time_t detzcode64(const char * codep); 157 static int differ_by_repeat(time_t t1, time_t t0); 158 static const char * getzname(const char * strp) __pure; 159 static const char * getqzname(const char * strp, const int delim) __pure; 160 static const char * getnum(const char * strp, int * nump, int min, 161 int max); 162 static const char * getsecs(const char * strp, long * secsp); 163 static const char * getoffset(const char * strp, long * offsetp); 164 static const char * getrule(const char * strp, struct rule * rulep); 165 static void gmtload(timezone_t sp); 166 static struct tm * gmtsub(const timezone_t sp, const time_t *timep, 167 long offset, struct tm * tmp); 168 static struct tm * localsub(const timezone_t sp, const time_t *timep, 169 long offset, struct tm *tmp); 170 static int increment_overflow(int * number, int delta); 171 static int leaps_thru_end_of(int y) __pure; 172 static int long_increment_overflow(long * number, int delta); 173 static int long_normalize_overflow(long * tensptr, 174 int * unitsptr, int base); 175 static int normalize_overflow(int * tensptr, int * unitsptr, 176 int base); 177 static void settzname(void); 178 static time_t time1(const timezone_t sp, struct tm * const tmp, 179 subfun_t funcp, const long offset); 180 static time_t time2(const timezone_t sp, struct tm * const tmp, 181 subfun_t funcp, 182 const long offset, int *const okayp); 183 static time_t time2sub(const timezone_t sp, struct tm * const tmp, 184 subfun_t funcp, const long offset, 185 int *const okayp, const int do_norm_secs); 186 static struct tm * timesub(const timezone_t sp, const time_t * timep, 187 long offset, struct tm * tmp); 188 static int tmcomp(const struct tm * atmp, 189 const struct tm * btmp); 190 static time_t transtime(time_t janfirst, int year, 191 const struct rule * rulep, long offset) __pure; 192 static int typesequiv(const timezone_t sp, int a, int b); 193 static int tzload(timezone_t sp, const char * name, 194 int doextend); 195 static int tzparse(timezone_t sp, const char * name, 196 int lastditch); 197 static void tzset_unlocked(void); 198 static void tzsetwall_unlocked(void); 199 static long leapcorr(const timezone_t sp, time_t * timep); 200 201 static timezone_t lclptr; 202 static timezone_t gmtptr; 203 204 #ifndef TZ_STRLEN_MAX 205 #define TZ_STRLEN_MAX 255 206 #endif /* !defined TZ_STRLEN_MAX */ 207 208 static char lcl_TZname[TZ_STRLEN_MAX + 1]; 209 static int lcl_is_set; 210 static int gmt_is_set; 211 212 #if !defined(__LIBC12_SOURCE__) 213 214 __aconst char * tzname[2] = { 215 (__aconst char *)__UNCONST(wildabbr), 216 (__aconst char *)__UNCONST(wildabbr) 217 }; 218 219 #else 220 221 extern __aconst char * tzname[2]; 222 223 #endif 224 225 #ifdef _REENTRANT 226 static rwlock_t lcl_lock = RWLOCK_INITIALIZER; 227 #endif 228 229 /* 230 ** Section 4.12.3 of X3.159-1989 requires that 231 ** Except for the strftime function, these functions [asctime, 232 ** ctime, gmtime, localtime] return values in one of two static 233 ** objects: a broken-down time structure and an array of char. 234 ** Thanks to Paul Eggert for noting this. 235 */ 236 237 static struct tm tm; 238 239 #ifdef USG_COMPAT 240 #if !defined(__LIBC12_SOURCE__) 241 long timezone = 0; 242 int daylight = 0; 243 #else 244 extern int daylight; 245 extern long timezone __RENAME(__timezone13); 246 #endif 247 #endif /* defined USG_COMPAT */ 248 249 #ifdef ALTZONE 250 time_t altzone = 0; 251 #endif /* defined ALTZONE */ 252 253 static long 254 detzcode(const char *const codep) 255 { 256 long result; 257 int i; 258 259 result = (codep[0] & 0x80) ? ~0L : 0; 260 for (i = 0; i < 4; ++i) 261 result = (result << 8) | (codep[i] & 0xff); 262 return result; 263 } 264 265 static time_t 266 detzcode64(const char *const codep) 267 { 268 time_t result; 269 int i; 270 271 result = (codep[0] & 0x80) ? -1 : 0; 272 for (i = 0; i < 8; ++i) 273 result = result * 256 + (codep[i] & 0xff); 274 return result; 275 } 276 277 const char * 278 tzgetname(const timezone_t sp, int isdst) 279 { 280 int i; 281 for (i = 0; i < sp->timecnt; ++i) { 282 const struct ttinfo *const ttisp = &sp->ttis[sp->types[i]]; 283 284 if (ttisp->tt_isdst == isdst) 285 return &sp->chars[ttisp->tt_abbrind]; 286 } 287 return NULL; 288 } 289 290 static void 291 settzname_z(timezone_t sp) 292 { 293 int i; 294 295 /* 296 ** Scrub the abbreviations. 297 ** First, replace bogus characters. 298 */ 299 for (i = 0; i < sp->charcnt; ++i) 300 if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL) 301 sp->chars[i] = TZ_ABBR_ERR_CHAR; 302 /* 303 ** Second, truncate long abbreviations. 304 */ 305 for (i = 0; i < sp->typecnt; ++i) { 306 const struct ttinfo * const ttisp = &sp->ttis[i]; 307 char * cp = &sp->chars[ttisp->tt_abbrind]; 308 309 if (strlen(cp) > TZ_ABBR_MAX_LEN && 310 strcmp(cp, GRANDPARENTED) != 0) 311 *(cp + TZ_ABBR_MAX_LEN) = '\0'; 312 } 313 } 314 315 static void 316 settzname(void) 317 { 318 timezone_t const sp = lclptr; 319 int i; 320 321 tzname[0] = (__aconst char *)__UNCONST(wildabbr); 322 tzname[1] = (__aconst char *)__UNCONST(wildabbr); 323 #ifdef USG_COMPAT 324 daylight = 0; 325 timezone = 0; 326 #endif /* defined USG_COMPAT */ 327 #ifdef ALTZONE 328 altzone = 0; 329 #endif /* defined ALTZONE */ 330 if (sp == NULL) { 331 tzname[0] = tzname[1] = (__aconst char *)__UNCONST(gmt); 332 return; 333 } 334 /* 335 ** And to get the latest zone names into tzname. . . 336 */ 337 for (i = 0; i < sp->typecnt; ++i) { 338 const struct ttinfo * const ttisp = &sp->ttis[i]; 339 340 tzname[ttisp->tt_isdst] = 341 &sp->chars[ttisp->tt_abbrind]; 342 #ifdef USG_COMPAT 343 if (ttisp->tt_isdst) 344 daylight = 1; 345 if (!ttisp->tt_isdst) 346 timezone = -(ttisp->tt_gmtoff); 347 #endif /* defined USG_COMPAT */ 348 #ifdef ALTZONE 349 if (i == 0 || ttisp->tt_isdst) 350 altzone = -(ttisp->tt_gmtoff); 351 #endif /* defined ALTZONE */ 352 } 353 settzname_z(sp); 354 } 355 356 static int 357 differ_by_repeat(const time_t t1, const time_t t0) 358 { 359 /* CONSTCOND */ 360 if (TYPE_INTEGRAL(time_t) && 361 TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS) 362 return 0; 363 return (int_fast64_t)t1 - (int_fast64_t)t0 == SECSPERREPEAT; 364 } 365 366 static int 367 tzload(timezone_t sp, const char *name, const int doextend) 368 { 369 const char * p; 370 int i; 371 int fid; 372 int stored; 373 ssize_t nread; 374 typedef union { 375 struct tzhead tzhead; 376 char buf[2 * sizeof(struct tzhead) + 377 2 * sizeof *sp + 378 4 * TZ_MAX_TIMES]; 379 } u_t; 380 u_t * up; 381 382 up = calloc(1, sizeof *up); 383 if (up == NULL) 384 return -1; 385 386 sp->goback = sp->goahead = FALSE; 387 if (name == NULL && (name = TZDEFAULT) == NULL) 388 goto oops; 389 { 390 int doaccess; 391 /* 392 ** Section 4.9.1 of the C standard says that 393 ** "FILENAME_MAX expands to an integral constant expression 394 ** that is the size needed for an array of char large enough 395 ** to hold the longest file name string that the implementation 396 ** guarantees can be opened." 397 */ 398 char fullname[FILENAME_MAX + 1]; 399 400 if (name[0] == ':') 401 ++name; 402 doaccess = name[0] == '/'; 403 if (!doaccess) { 404 if ((p = TZDIR) == NULL) 405 goto oops; 406 if ((strlen(p) + strlen(name) + 1) >= sizeof fullname) 407 goto oops; 408 (void) strcpy(fullname, p); /* XXX strcpy is safe */ 409 (void) strcat(fullname, "/"); /* XXX strcat is safe */ 410 (void) strcat(fullname, name); /* XXX strcat is safe */ 411 /* 412 ** Set doaccess if '.' (as in "../") shows up in name. 413 */ 414 if (strchr(name, '.') != NULL) 415 doaccess = TRUE; 416 name = fullname; 417 } 418 if (doaccess && access(name, R_OK) != 0) 419 goto oops; 420 /* 421 * XXX potential security problem here if user of a set-id 422 * program has set TZ (which is passed in as name) here, 423 * and uses a race condition trick to defeat the access(2) 424 * above. 425 */ 426 if ((fid = open(name, OPEN_MODE)) == -1) 427 goto oops; 428 } 429 nread = read(fid, up->buf, sizeof up->buf); 430 if (close(fid) < 0 || nread <= 0) 431 goto oops; 432 for (stored = 4; stored <= 8; stored *= 2) { 433 int ttisstdcnt; 434 int ttisgmtcnt; 435 436 ttisstdcnt = (int) detzcode(up->tzhead.tzh_ttisstdcnt); 437 ttisgmtcnt = (int) detzcode(up->tzhead.tzh_ttisgmtcnt); 438 sp->leapcnt = (int) detzcode(up->tzhead.tzh_leapcnt); 439 sp->timecnt = (int) detzcode(up->tzhead.tzh_timecnt); 440 sp->typecnt = (int) detzcode(up->tzhead.tzh_typecnt); 441 sp->charcnt = (int) detzcode(up->tzhead.tzh_charcnt); 442 p = up->tzhead.tzh_charcnt + sizeof up->tzhead.tzh_charcnt; 443 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || 444 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || 445 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || 446 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS || 447 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) || 448 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0)) 449 goto oops; 450 if (nread - (p - up->buf) < 451 sp->timecnt * stored + /* ats */ 452 sp->timecnt + /* types */ 453 sp->typecnt * 6 + /* ttinfos */ 454 sp->charcnt + /* chars */ 455 sp->leapcnt * (stored + 4) + /* lsinfos */ 456 ttisstdcnt + /* ttisstds */ 457 ttisgmtcnt) /* ttisgmts */ 458 goto oops; 459 for (i = 0; i < sp->timecnt; ++i) { 460 sp->ats[i] = (time_t)((stored == 4) ? 461 detzcode(p) : detzcode64(p)); 462 p += stored; 463 } 464 for (i = 0; i < sp->timecnt; ++i) { 465 sp->types[i] = (unsigned char) *p++; 466 if (sp->types[i] >= sp->typecnt) 467 goto oops; 468 } 469 for (i = 0; i < sp->typecnt; ++i) { 470 struct ttinfo * ttisp; 471 472 ttisp = &sp->ttis[i]; 473 ttisp->tt_gmtoff = detzcode(p); 474 p += 4; 475 ttisp->tt_isdst = (unsigned char) *p++; 476 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) 477 goto oops; 478 ttisp->tt_abbrind = (unsigned char) *p++; 479 if (ttisp->tt_abbrind < 0 || 480 ttisp->tt_abbrind > sp->charcnt) 481 goto oops; 482 } 483 for (i = 0; i < sp->charcnt; ++i) 484 sp->chars[i] = *p++; 485 sp->chars[i] = '\0'; /* ensure '\0' at end */ 486 for (i = 0; i < sp->leapcnt; ++i) { 487 struct lsinfo * lsisp; 488 489 lsisp = &sp->lsis[i]; 490 lsisp->ls_trans = (time_t)((stored == 4) ? 491 detzcode(p) : detzcode64(p)); 492 p += stored; 493 lsisp->ls_corr = detzcode(p); 494 p += 4; 495 } 496 for (i = 0; i < sp->typecnt; ++i) { 497 struct ttinfo * ttisp; 498 499 ttisp = &sp->ttis[i]; 500 if (ttisstdcnt == 0) 501 ttisp->tt_ttisstd = FALSE; 502 else { 503 ttisp->tt_ttisstd = *p++; 504 if (ttisp->tt_ttisstd != TRUE && 505 ttisp->tt_ttisstd != FALSE) 506 goto oops; 507 } 508 } 509 for (i = 0; i < sp->typecnt; ++i) { 510 struct ttinfo * ttisp; 511 512 ttisp = &sp->ttis[i]; 513 if (ttisgmtcnt == 0) 514 ttisp->tt_ttisgmt = FALSE; 515 else { 516 ttisp->tt_ttisgmt = *p++; 517 if (ttisp->tt_ttisgmt != TRUE && 518 ttisp->tt_ttisgmt != FALSE) 519 goto oops; 520 } 521 } 522 /* 523 ** Out-of-sort ats should mean we're running on a 524 ** signed time_t system but using a data file with 525 ** unsigned values (or vice versa). 526 */ 527 for (i = 0; i < sp->timecnt - 2; ++i) 528 if (sp->ats[i] > sp->ats[i + 1]) { 529 ++i; 530 /* CONSTCOND */ 531 if (TYPE_SIGNED(time_t)) { 532 /* 533 ** Ignore the end (easy). 534 */ 535 sp->timecnt = i; 536 } else { 537 /* 538 ** Ignore the beginning (harder). 539 */ 540 int j; 541 542 for (j = 0; j + i < sp->timecnt; ++j) { 543 sp->ats[j] = sp->ats[j + i]; 544 sp->types[j] = sp->types[j + i]; 545 } 546 sp->timecnt = j; 547 } 548 break; 549 } 550 /* 551 ** If this is an old file, we're done. 552 */ 553 if (up->tzhead.tzh_version[0] == '\0') 554 break; 555 nread -= p - up->buf; 556 for (i = 0; i < nread; ++i) 557 up->buf[i] = p[i]; 558 /* 559 ** If this is a narrow integer time_t system, we're done. 560 */ 561 if (stored >= (int) sizeof(time_t) 562 /* CONSTCOND */ 563 && TYPE_INTEGRAL(time_t)) 564 break; 565 } 566 if (doextend && nread > 2 && 567 up->buf[0] == '\n' && up->buf[nread - 1] == '\n' && 568 sp->typecnt + 2 <= TZ_MAX_TYPES) { 569 struct __state ts; 570 int result; 571 572 up->buf[nread - 1] = '\0'; 573 result = tzparse(&ts, &up->buf[1], FALSE); 574 if (result == 0 && ts.typecnt == 2 && 575 sp->charcnt + ts.charcnt <= TZ_MAX_CHARS) { 576 for (i = 0; i < 2; ++i) 577 ts.ttis[i].tt_abbrind += 578 sp->charcnt; 579 for (i = 0; i < ts.charcnt; ++i) 580 sp->chars[sp->charcnt++] = 581 ts.chars[i]; 582 i = 0; 583 while (i < ts.timecnt && 584 ts.ats[i] <= 585 sp->ats[sp->timecnt - 1]) 586 ++i; 587 while (i < ts.timecnt && 588 sp->timecnt < TZ_MAX_TIMES) { 589 sp->ats[sp->timecnt] = 590 ts.ats[i]; 591 sp->types[sp->timecnt] = 592 sp->typecnt + 593 ts.types[i]; 594 ++sp->timecnt; 595 ++i; 596 } 597 sp->ttis[sp->typecnt++] = ts.ttis[0]; 598 sp->ttis[sp->typecnt++] = ts.ttis[1]; 599 } 600 } 601 if (sp->timecnt > 1) { 602 for (i = 1; i < sp->timecnt; ++i) 603 if (typesequiv(sp, sp->types[i], sp->types[0]) && 604 differ_by_repeat(sp->ats[i], sp->ats[0])) { 605 sp->goback = TRUE; 606 break; 607 } 608 for (i = sp->timecnt - 2; i >= 0; --i) 609 if (typesequiv(sp, sp->types[sp->timecnt - 1], 610 sp->types[i]) && 611 differ_by_repeat(sp->ats[sp->timecnt - 1], 612 sp->ats[i])) { 613 sp->goahead = TRUE; 614 break; 615 } 616 } 617 free(up); 618 return 0; 619 oops: 620 free(up); 621 return -1; 622 } 623 624 static int 625 typesequiv(const timezone_t sp, const int a, const int b) 626 { 627 int result; 628 629 if (sp == NULL || 630 a < 0 || a >= sp->typecnt || 631 b < 0 || b >= sp->typecnt) 632 result = FALSE; 633 else { 634 const struct ttinfo * ap = &sp->ttis[a]; 635 const struct ttinfo * bp = &sp->ttis[b]; 636 result = ap->tt_gmtoff == bp->tt_gmtoff && 637 ap->tt_isdst == bp->tt_isdst && 638 ap->tt_ttisstd == bp->tt_ttisstd && 639 ap->tt_ttisgmt == bp->tt_ttisgmt && 640 strcmp(&sp->chars[ap->tt_abbrind], 641 &sp->chars[bp->tt_abbrind]) == 0; 642 } 643 return result; 644 } 645 646 static const int mon_lengths[2][MONSPERYEAR] = { 647 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 648 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } 649 }; 650 651 static const int year_lengths[2] = { 652 DAYSPERNYEAR, DAYSPERLYEAR 653 }; 654 655 /* 656 ** Given a pointer into a time zone string, scan until a character that is not 657 ** a valid character in a zone name is found. Return a pointer to that 658 ** character. 659 */ 660 661 static const char * 662 getzname(const char *strp) 663 { 664 char c; 665 666 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && 667 c != '+') 668 ++strp; 669 return strp; 670 } 671 672 /* 673 ** Given a pointer into an extended time zone string, scan until the ending 674 ** delimiter of the zone name is located. Return a pointer to the delimiter. 675 ** 676 ** As with getzname above, the legal character set is actually quite 677 ** restricted, with other characters producing undefined results. 678 ** We don't do any checking here; checking is done later in common-case code. 679 */ 680 681 static const char * 682 getqzname(const char *strp, const int delim) 683 { 684 int c; 685 686 while ((c = *strp) != '\0' && c != delim) 687 ++strp; 688 return strp; 689 } 690 691 /* 692 ** Given a pointer into a time zone string, extract a number from that string. 693 ** Check that the number is within a specified range; if it is not, return 694 ** NULL. 695 ** Otherwise, return a pointer to the first character not part of the number. 696 */ 697 698 static const char * 699 getnum(const char *strp, int *const nump, const int min, const int max) 700 { 701 char c; 702 int num; 703 704 if (strp == NULL || !is_digit(c = *strp)) { 705 errno = EINVAL; 706 return NULL; 707 } 708 num = 0; 709 do { 710 num = num * 10 + (c - '0'); 711 if (num > max) { 712 errno = EOVERFLOW; 713 return NULL; /* illegal value */ 714 } 715 c = *++strp; 716 } while (is_digit(c)); 717 if (num < min) { 718 errno = EINVAL; 719 return NULL; /* illegal value */ 720 } 721 *nump = num; 722 return strp; 723 } 724 725 /* 726 ** Given a pointer into a time zone string, extract a number of seconds, 727 ** in hh[:mm[:ss]] form, from the string. 728 ** If any error occurs, return NULL. 729 ** Otherwise, return a pointer to the first character not part of the number 730 ** of seconds. 731 */ 732 733 static const char * 734 getsecs(const char *strp, long *const secsp) 735 { 736 int num; 737 738 /* 739 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like 740 ** "M10.4.6/26", which does not conform to Posix, 741 ** but which specifies the equivalent of 742 ** ``02:00 on the first Sunday on or after 23 Oct''. 743 */ 744 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); 745 if (strp == NULL) 746 return NULL; 747 *secsp = num * (long) SECSPERHOUR; 748 if (*strp == ':') { 749 ++strp; 750 strp = getnum(strp, &num, 0, MINSPERHOUR - 1); 751 if (strp == NULL) 752 return NULL; 753 *secsp += num * SECSPERMIN; 754 if (*strp == ':') { 755 ++strp; 756 /* `SECSPERMIN' allows for leap seconds. */ 757 strp = getnum(strp, &num, 0, SECSPERMIN); 758 if (strp == NULL) 759 return NULL; 760 *secsp += num; 761 } 762 } 763 return strp; 764 } 765 766 /* 767 ** Given a pointer into a time zone string, extract an offset, in 768 ** [+-]hh[:mm[:ss]] form, from the string. 769 ** If any error occurs, return NULL. 770 ** Otherwise, return a pointer to the first character not part of the time. 771 */ 772 773 static const char * 774 getoffset(const char *strp, long *const offsetp) 775 { 776 int neg = 0; 777 778 if (*strp == '-') { 779 neg = 1; 780 ++strp; 781 } else if (*strp == '+') 782 ++strp; 783 strp = getsecs(strp, offsetp); 784 if (strp == NULL) 785 return NULL; /* illegal time */ 786 if (neg) 787 *offsetp = -*offsetp; 788 return strp; 789 } 790 791 /* 792 ** Given a pointer into a time zone string, extract a rule in the form 793 ** date[/time]. See POSIX section 8 for the format of "date" and "time". 794 ** If a valid rule is not found, return NULL. 795 ** Otherwise, return a pointer to the first character not part of the rule. 796 */ 797 798 static const char * 799 getrule(const char *strp, struct rule *const rulep) 800 { 801 if (*strp == 'J') { 802 /* 803 ** Julian day. 804 */ 805 rulep->r_type = JULIAN_DAY; 806 ++strp; 807 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); 808 } else if (*strp == 'M') { 809 /* 810 ** Month, week, day. 811 */ 812 rulep->r_type = MONTH_NTH_DAY_OF_WEEK; 813 ++strp; 814 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); 815 if (strp == NULL) 816 return NULL; 817 if (*strp++ != '.') 818 return NULL; 819 strp = getnum(strp, &rulep->r_week, 1, 5); 820 if (strp == NULL) 821 return NULL; 822 if (*strp++ != '.') 823 return NULL; 824 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); 825 } else if (is_digit(*strp)) { 826 /* 827 ** Day of year. 828 */ 829 rulep->r_type = DAY_OF_YEAR; 830 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); 831 } else return NULL; /* invalid format */ 832 if (strp == NULL) 833 return NULL; 834 if (*strp == '/') { 835 /* 836 ** Time specified. 837 */ 838 ++strp; 839 strp = getsecs(strp, &rulep->r_time); 840 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ 841 return strp; 842 } 843 844 /* 845 ** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the 846 ** year, a rule, and the offset from UTC at the time that rule takes effect, 847 ** calculate the Epoch-relative time that rule takes effect. 848 */ 849 850 static time_t 851 transtime(const time_t janfirst, const int year, const struct rule *const rulep, 852 const long offset) 853 { 854 int leapyear; 855 time_t value; 856 int i; 857 int d, m1, yy0, yy1, yy2, dow; 858 859 INITIALIZE(value); 860 leapyear = isleap(year); 861 switch (rulep->r_type) { 862 863 case JULIAN_DAY: 864 /* 865 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap 866 ** years. 867 ** In non-leap years, or if the day number is 59 or less, just 868 ** add SECSPERDAY times the day number-1 to the time of 869 ** January 1, midnight, to get the day. 870 */ 871 value = (time_t)(janfirst + (rulep->r_day - 1) * SECSPERDAY); 872 if (leapyear && rulep->r_day >= 60) 873 value += SECSPERDAY; 874 break; 875 876 case DAY_OF_YEAR: 877 /* 878 ** n - day of year. 879 ** Just add SECSPERDAY times the day number to the time of 880 ** January 1, midnight, to get the day. 881 */ 882 value = (time_t)(janfirst + rulep->r_day * SECSPERDAY); 883 break; 884 885 case MONTH_NTH_DAY_OF_WEEK: 886 /* 887 ** Mm.n.d - nth "dth day" of month m. 888 */ 889 value = janfirst; 890 for (i = 0; i < rulep->r_mon - 1; ++i) 891 value += (time_t)(mon_lengths[leapyear][i] * SECSPERDAY); 892 893 /* 894 ** Use Zeller's Congruence to get day-of-week of first day of 895 ** month. 896 */ 897 m1 = (rulep->r_mon + 9) % 12 + 1; 898 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; 899 yy1 = yy0 / 100; 900 yy2 = yy0 % 100; 901 dow = ((26 * m1 - 2) / 10 + 902 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; 903 if (dow < 0) 904 dow += DAYSPERWEEK; 905 906 /* 907 ** "dow" is the day-of-week of the first day of the month. Get 908 ** the day-of-month (zero-origin) of the first "dow" day of the 909 ** month. 910 */ 911 d = rulep->r_day - dow; 912 if (d < 0) 913 d += DAYSPERWEEK; 914 for (i = 1; i < rulep->r_week; ++i) { 915 if (d + DAYSPERWEEK >= 916 mon_lengths[leapyear][rulep->r_mon - 1]) 917 break; 918 d += DAYSPERWEEK; 919 } 920 921 /* 922 ** "d" is the day-of-month (zero-origin) of the day we want. 923 */ 924 value += (time_t)(d * SECSPERDAY); 925 break; 926 } 927 928 /* 929 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in 930 ** question. To get the Epoch-relative time of the specified local 931 ** time on that day, add the transition time and the current offset 932 ** from UTC. 933 */ 934 return (time_t)(value + rulep->r_time + offset); 935 } 936 937 /* 938 ** Given a POSIX section 8-style TZ string, fill in the rule tables as 939 ** appropriate. 940 */ 941 942 static int 943 tzparse(timezone_t sp, const char *name, const int lastditch) 944 { 945 const char * stdname; 946 const char * dstname; 947 size_t stdlen; 948 size_t dstlen; 949 long stdoffset; 950 long dstoffset; 951 time_t * atp; 952 unsigned char * typep; 953 char * cp; 954 int load_result; 955 956 INITIALIZE(dstname); 957 stdname = name; 958 if (lastditch) { 959 stdlen = strlen(name); /* length of standard zone name */ 960 name += stdlen; 961 if (stdlen >= sizeof sp->chars) 962 stdlen = (sizeof sp->chars) - 1; 963 stdoffset = 0; 964 } else { 965 if (*name == '<') { 966 name++; 967 stdname = name; 968 name = getqzname(name, '>'); 969 if (*name != '>') 970 return (-1); 971 stdlen = name - stdname; 972 name++; 973 } else { 974 name = getzname(name); 975 stdlen = name - stdname; 976 } 977 if (*name == '\0') 978 return -1; 979 name = getoffset(name, &stdoffset); 980 if (name == NULL) 981 return -1; 982 } 983 load_result = tzload(sp, TZDEFRULES, FALSE); 984 if (load_result != 0) 985 sp->leapcnt = 0; /* so, we're off a little */ 986 if (*name != '\0') { 987 if (*name == '<') { 988 dstname = ++name; 989 name = getqzname(name, '>'); 990 if (*name != '>') 991 return -1; 992 dstlen = name - dstname; 993 name++; 994 } else { 995 dstname = name; 996 name = getzname(name); 997 dstlen = name - dstname; /* length of DST zone name */ 998 } 999 if (*name != '\0' && *name != ',' && *name != ';') { 1000 name = getoffset(name, &dstoffset); 1001 if (name == NULL) 1002 return -1; 1003 } else dstoffset = stdoffset - SECSPERHOUR; 1004 if (*name == '\0' && load_result != 0) 1005 name = TZDEFRULESTRING; 1006 if (*name == ',' || *name == ';') { 1007 struct rule start; 1008 struct rule end; 1009 int year; 1010 time_t janfirst; 1011 time_t starttime; 1012 time_t endtime; 1013 1014 ++name; 1015 if ((name = getrule(name, &start)) == NULL) 1016 return -1; 1017 if (*name++ != ',') 1018 return -1; 1019 if ((name = getrule(name, &end)) == NULL) 1020 return -1; 1021 if (*name != '\0') 1022 return -1; 1023 sp->typecnt = 2; /* standard time and DST */ 1024 /* 1025 ** Two transitions per year, from EPOCH_YEAR forward. 1026 */ 1027 memset(sp->ttis, 0, sizeof(sp->ttis)); 1028 sp->ttis[0].tt_gmtoff = -dstoffset; 1029 sp->ttis[0].tt_isdst = 1; 1030 sp->ttis[0].tt_abbrind = (int)(stdlen + 1); 1031 sp->ttis[1].tt_gmtoff = -stdoffset; 1032 sp->ttis[1].tt_isdst = 0; 1033 sp->ttis[1].tt_abbrind = 0; 1034 atp = sp->ats; 1035 typep = sp->types; 1036 janfirst = 0; 1037 sp->timecnt = 0; 1038 for (year = EPOCH_YEAR; 1039 sp->timecnt + 2 <= TZ_MAX_TIMES; 1040 ++year) { 1041 time_t newfirst; 1042 1043 starttime = transtime(janfirst, year, &start, 1044 stdoffset); 1045 endtime = transtime(janfirst, year, &end, 1046 dstoffset); 1047 if (starttime > endtime) { 1048 *atp++ = endtime; 1049 *typep++ = 1; /* DST ends */ 1050 *atp++ = starttime; 1051 *typep++ = 0; /* DST begins */ 1052 } else { 1053 *atp++ = starttime; 1054 *typep++ = 0; /* DST begins */ 1055 *atp++ = endtime; 1056 *typep++ = 1; /* DST ends */ 1057 } 1058 sp->timecnt += 2; 1059 newfirst = janfirst; 1060 newfirst += (time_t) 1061 (year_lengths[isleap(year)] * SECSPERDAY); 1062 if (newfirst <= janfirst) 1063 break; 1064 janfirst = newfirst; 1065 } 1066 } else { 1067 long theirstdoffset; 1068 long theirdstoffset; 1069 long theiroffset; 1070 int isdst; 1071 int i; 1072 int j; 1073 1074 if (*name != '\0') 1075 return -1; 1076 /* 1077 ** Initial values of theirstdoffset and theirdstoffset. 1078 */ 1079 theirstdoffset = 0; 1080 for (i = 0; i < sp->timecnt; ++i) { 1081 j = sp->types[i]; 1082 if (!sp->ttis[j].tt_isdst) { 1083 theirstdoffset = 1084 -sp->ttis[j].tt_gmtoff; 1085 break; 1086 } 1087 } 1088 theirdstoffset = 0; 1089 for (i = 0; i < sp->timecnt; ++i) { 1090 j = sp->types[i]; 1091 if (sp->ttis[j].tt_isdst) { 1092 theirdstoffset = 1093 -sp->ttis[j].tt_gmtoff; 1094 break; 1095 } 1096 } 1097 /* 1098 ** Initially we're assumed to be in standard time. 1099 */ 1100 isdst = FALSE; 1101 theiroffset = theirstdoffset; 1102 /* 1103 ** Now juggle transition times and types 1104 ** tracking offsets as you do. 1105 */ 1106 for (i = 0; i < sp->timecnt; ++i) { 1107 j = sp->types[i]; 1108 sp->types[i] = sp->ttis[j].tt_isdst; 1109 if (sp->ttis[j].tt_ttisgmt) { 1110 /* No adjustment to transition time */ 1111 } else { 1112 /* 1113 ** If summer time is in effect, and the 1114 ** transition time was not specified as 1115 ** standard time, add the summer time 1116 ** offset to the transition time; 1117 ** otherwise, add the standard time 1118 ** offset to the transition time. 1119 */ 1120 /* 1121 ** Transitions from DST to DDST 1122 ** will effectively disappear since 1123 ** POSIX provides for only one DST 1124 ** offset. 1125 */ 1126 if (isdst && !sp->ttis[j].tt_ttisstd) { 1127 sp->ats[i] += (time_t) 1128 (dstoffset - theirdstoffset); 1129 } else { 1130 sp->ats[i] += (time_t) 1131 (stdoffset - theirstdoffset); 1132 } 1133 } 1134 theiroffset = -sp->ttis[j].tt_gmtoff; 1135 if (!sp->ttis[j].tt_isdst) 1136 theirstdoffset = theiroffset; 1137 else theirdstoffset = theiroffset; 1138 } 1139 /* 1140 ** Finally, fill in ttis. 1141 ** ttisstd and ttisgmt need not be handled 1142 */ 1143 memset(sp->ttis, 0, sizeof(sp->ttis)); 1144 sp->ttis[0].tt_gmtoff = -stdoffset; 1145 sp->ttis[0].tt_isdst = FALSE; 1146 sp->ttis[0].tt_abbrind = 0; 1147 sp->ttis[1].tt_gmtoff = -dstoffset; 1148 sp->ttis[1].tt_isdst = TRUE; 1149 sp->ttis[1].tt_abbrind = (int)(stdlen + 1); 1150 sp->typecnt = 2; 1151 } 1152 } else { 1153 dstlen = 0; 1154 sp->typecnt = 1; /* only standard time */ 1155 sp->timecnt = 0; 1156 memset(sp->ttis, 0, sizeof(sp->ttis)); 1157 sp->ttis[0].tt_gmtoff = -stdoffset; 1158 sp->ttis[0].tt_isdst = 0; 1159 sp->ttis[0].tt_abbrind = 0; 1160 } 1161 sp->charcnt = (int)(stdlen + 1); 1162 if (dstlen != 0) 1163 sp->charcnt += (int)(dstlen + 1); 1164 if ((size_t) sp->charcnt > sizeof sp->chars) 1165 return -1; 1166 cp = sp->chars; 1167 (void) strncpy(cp, stdname, stdlen); 1168 cp += stdlen; 1169 *cp++ = '\0'; 1170 if (dstlen != 0) { 1171 (void) strncpy(cp, dstname, dstlen); 1172 *(cp + dstlen) = '\0'; 1173 } 1174 return 0; 1175 } 1176 1177 static void 1178 gmtload(timezone_t sp) 1179 { 1180 if (tzload(sp, gmt, TRUE) != 0) 1181 (void) tzparse(sp, gmt, TRUE); 1182 } 1183 1184 timezone_t 1185 tzalloc(const char *name) 1186 { 1187 timezone_t sp = calloc(1, sizeof *sp); 1188 if (sp == NULL) 1189 return NULL; 1190 if (tzload(sp, name, TRUE) != 0) { 1191 free(sp); 1192 return NULL; 1193 } 1194 settzname_z(sp); 1195 return sp; 1196 } 1197 1198 void 1199 tzfree(const timezone_t sp) 1200 { 1201 free(sp); 1202 } 1203 1204 static void 1205 tzsetwall_unlocked(void) 1206 { 1207 if (lcl_is_set < 0) 1208 return; 1209 lcl_is_set = -1; 1210 1211 if (lclptr == NULL) { 1212 int saveerrno = errno; 1213 lclptr = calloc(1, sizeof *lclptr); 1214 errno = saveerrno; 1215 if (lclptr == NULL) { 1216 settzname(); /* all we can do */ 1217 return; 1218 } 1219 } 1220 if (tzload(lclptr, NULL, TRUE) != 0) 1221 gmtload(lclptr); 1222 settzname(); 1223 } 1224 1225 #ifndef STD_INSPIRED 1226 /* 1227 ** A non-static declaration of tzsetwall in a system header file 1228 ** may cause a warning about this upcoming static declaration... 1229 */ 1230 static 1231 #endif /* !defined STD_INSPIRED */ 1232 void 1233 tzsetwall(void) 1234 { 1235 rwlock_wrlock(&lcl_lock); 1236 tzsetwall_unlocked(); 1237 rwlock_unlock(&lcl_lock); 1238 } 1239 1240 #ifndef STD_INSPIRED 1241 /* 1242 ** A non-static declaration of tzsetwall in a system header file 1243 ** may cause a warning about this upcoming static declaration... 1244 */ 1245 static 1246 #endif /* !defined STD_INSPIRED */ 1247 void 1248 tzset_unlocked(void) 1249 { 1250 const char * name; 1251 1252 name = getenv("TZ"); 1253 if (name == NULL) { 1254 tzsetwall_unlocked(); 1255 return; 1256 } 1257 1258 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) 1259 return; 1260 lcl_is_set = strlen(name) < sizeof lcl_TZname; 1261 if (lcl_is_set) 1262 (void)strlcpy(lcl_TZname, name, sizeof(lcl_TZname)); 1263 1264 if (lclptr == NULL) { 1265 int saveerrno = errno; 1266 lclptr = calloc(1, sizeof *lclptr); 1267 errno = saveerrno; 1268 if (lclptr == NULL) { 1269 settzname(); /* all we can do */ 1270 return; 1271 } 1272 } 1273 if (*name == '\0') { 1274 /* 1275 ** User wants it fast rather than right. 1276 */ 1277 lclptr->leapcnt = 0; /* so, we're off a little */ 1278 lclptr->timecnt = 0; 1279 lclptr->typecnt = 0; 1280 lclptr->ttis[0].tt_isdst = 0; 1281 lclptr->ttis[0].tt_gmtoff = 0; 1282 lclptr->ttis[0].tt_abbrind = 0; 1283 (void) strlcpy(lclptr->chars, gmt, sizeof(lclptr->chars)); 1284 } else if (tzload(lclptr, name, TRUE) != 0) 1285 if (name[0] == ':' || tzparse(lclptr, name, FALSE) != 0) 1286 (void) gmtload(lclptr); 1287 settzname(); 1288 } 1289 1290 void 1291 tzset(void) 1292 { 1293 rwlock_wrlock(&lcl_lock); 1294 tzset_unlocked(); 1295 rwlock_unlock(&lcl_lock); 1296 } 1297 1298 /* 1299 ** The easy way to behave "as if no library function calls" localtime 1300 ** is to not call it--so we drop its guts into "localsub", which can be 1301 ** freely called. (And no, the PANS doesn't require the above behavior-- 1302 ** but it *is* desirable.) 1303 ** 1304 ** The unused offset argument is for the benefit of mktime variants. 1305 */ 1306 1307 /*ARGSUSED*/ 1308 static struct tm * 1309 localsub(const timezone_t sp, const time_t * const timep, const long offset, 1310 struct tm *const tmp) 1311 { 1312 const struct ttinfo * ttisp; 1313 int i; 1314 struct tm * result; 1315 const time_t t = *timep; 1316 1317 if ((sp->goback && t < sp->ats[0]) || 1318 (sp->goahead && t > sp->ats[sp->timecnt - 1])) { 1319 time_t newt = t; 1320 time_t seconds; 1321 time_t tcycles; 1322 int_fast64_t icycles; 1323 1324 if (t < sp->ats[0]) 1325 seconds = sp->ats[0] - t; 1326 else seconds = t - sp->ats[sp->timecnt - 1]; 1327 --seconds; 1328 tcycles = (time_t) 1329 (seconds / YEARSPERREPEAT / AVGSECSPERYEAR); 1330 ++tcycles; 1331 icycles = tcycles; 1332 if (tcycles - icycles >= 1 || icycles - tcycles >= 1) 1333 return NULL; 1334 seconds = (time_t) icycles; 1335 seconds *= YEARSPERREPEAT; 1336 seconds *= AVGSECSPERYEAR; 1337 if (t < sp->ats[0]) 1338 newt += seconds; 1339 else newt -= seconds; 1340 if (newt < sp->ats[0] || 1341 newt > sp->ats[sp->timecnt - 1]) 1342 return NULL; /* "cannot happen" */ 1343 result = localsub(sp, &newt, offset, tmp); 1344 if (result == tmp) { 1345 time_t newy; 1346 1347 newy = tmp->tm_year; 1348 if (t < sp->ats[0]) 1349 newy -= (time_t)icycles * YEARSPERREPEAT; 1350 else newy += (time_t)icycles * YEARSPERREPEAT; 1351 tmp->tm_year = (int)newy; 1352 if (tmp->tm_year != newy) 1353 return NULL; 1354 } 1355 return result; 1356 } 1357 if (sp->timecnt == 0 || t < sp->ats[0]) { 1358 i = 0; 1359 while (sp->ttis[i].tt_isdst) 1360 if (++i >= sp->typecnt) { 1361 i = 0; 1362 break; 1363 } 1364 } else { 1365 int lo = 1; 1366 int hi = sp->timecnt; 1367 1368 while (lo < hi) { 1369 int mid = (lo + hi) / 2; 1370 1371 if (t < sp->ats[mid]) 1372 hi = mid; 1373 else lo = mid + 1; 1374 } 1375 i = (int) sp->types[lo - 1]; 1376 } 1377 ttisp = &sp->ttis[i]; 1378 /* 1379 ** To get (wrong) behavior that's compatible with System V Release 2.0 1380 ** you'd replace the statement below with 1381 ** t += ttisp->tt_gmtoff; 1382 ** timesub(&t, 0L, sp, tmp); 1383 */ 1384 result = timesub(sp, &t, ttisp->tt_gmtoff, tmp); 1385 tmp->tm_isdst = ttisp->tt_isdst; 1386 if (sp == lclptr) 1387 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; 1388 #ifdef TM_ZONE 1389 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; 1390 #endif /* defined TM_ZONE */ 1391 return result; 1392 } 1393 1394 /* 1395 ** Re-entrant version of localtime. 1396 */ 1397 1398 struct tm * 1399 localtime_r(const time_t * __restrict timep, struct tm *tmp) 1400 { 1401 rwlock_rdlock(&lcl_lock); 1402 tzset_unlocked(); 1403 tmp = localtime_rz(lclptr, timep, tmp); 1404 rwlock_unlock(&lcl_lock); 1405 return tmp; 1406 } 1407 1408 struct tm * 1409 localtime(const time_t *const timep) 1410 { 1411 return localtime_r(timep, &tm); 1412 } 1413 1414 struct tm * 1415 localtime_rz(const timezone_t sp, const time_t * __restrict timep, struct tm *tmp) 1416 { 1417 if (sp == NULL) 1418 tmp = gmtsub(NULL, timep, 0L, tmp); 1419 else 1420 tmp = localsub(sp, timep, 0L, tmp); 1421 if (tmp == NULL) 1422 errno = EOVERFLOW; 1423 return tmp; 1424 } 1425 1426 /* 1427 ** gmtsub is to gmtime as localsub is to localtime. 1428 */ 1429 1430 static struct tm * 1431 gmtsub(const timezone_t sp, const time_t *const timep, const long offset, 1432 struct tm *const tmp) 1433 { 1434 struct tm * result; 1435 #ifdef _REENTRANT 1436 static mutex_t gmt_mutex = MUTEX_INITIALIZER; 1437 #endif 1438 1439 mutex_lock(&gmt_mutex); 1440 if (!gmt_is_set) { 1441 int saveerrno; 1442 gmt_is_set = TRUE; 1443 saveerrno = errno; 1444 gmtptr = calloc(1, sizeof *gmtptr); 1445 errno = saveerrno; 1446 if (gmtptr != NULL) 1447 gmtload(gmtptr); 1448 } 1449 mutex_unlock(&gmt_mutex); 1450 result = timesub(gmtptr, timep, offset, tmp); 1451 #ifdef TM_ZONE 1452 /* 1453 ** Could get fancy here and deliver something such as 1454 ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero, 1455 ** but this is no time for a treasure hunt. 1456 */ 1457 if (offset != 0) 1458 tmp->TM_ZONE = (__aconst char *)__UNCONST(wildabbr); 1459 else { 1460 if (gmtptr == NULL) 1461 tmp->TM_ZONE = (__aconst char *)__UNCONST(gmt); 1462 else tmp->TM_ZONE = gmtptr->chars; 1463 } 1464 #endif /* defined TM_ZONE */ 1465 return result; 1466 } 1467 1468 struct tm * 1469 gmtime(const time_t *const timep) 1470 { 1471 struct tm *tmp = gmtsub(NULL, timep, 0L, &tm); 1472 1473 if (tmp == NULL) 1474 errno = EOVERFLOW; 1475 1476 return tmp; 1477 } 1478 1479 /* 1480 ** Re-entrant version of gmtime. 1481 */ 1482 1483 struct tm * 1484 gmtime_r(const time_t * const timep, struct tm *tmp) 1485 { 1486 tmp = gmtsub(NULL, timep, 0L, tmp); 1487 1488 if (tmp == NULL) 1489 errno = EOVERFLOW; 1490 1491 return tmp; 1492 } 1493 1494 #ifdef STD_INSPIRED 1495 1496 struct tm * 1497 offtime(const time_t *const timep, long offset) 1498 { 1499 struct tm *tmp = gmtsub(NULL, timep, offset, &tm); 1500 1501 if (tmp == NULL) 1502 errno = EOVERFLOW; 1503 1504 return tmp; 1505 } 1506 1507 struct tm * 1508 offtime_r(const time_t *timep, long offset, struct tm *tmp) 1509 { 1510 tmp = gmtsub(NULL, timep, offset, tmp); 1511 1512 if (tmp == NULL) 1513 errno = EOVERFLOW; 1514 1515 return tmp; 1516 } 1517 1518 #endif /* defined STD_INSPIRED */ 1519 1520 /* 1521 ** Return the number of leap years through the end of the given year 1522 ** where, to make the math easy, the answer for year zero is defined as zero. 1523 */ 1524 1525 static int 1526 leaps_thru_end_of(const int y) 1527 { 1528 return (y >= 0) ? (y / 4 - y / 100 + y / 400) : 1529 -(leaps_thru_end_of(-(y + 1)) + 1); 1530 } 1531 1532 static struct tm * 1533 timesub(const timezone_t sp, const time_t *const timep, const long offset, 1534 struct tm *const tmp) 1535 { 1536 const struct lsinfo * lp; 1537 time_t tdays; 1538 int idays; /* unsigned would be so 2003 */ 1539 long rem; 1540 int y; 1541 const int * ip; 1542 long corr; 1543 int hit; 1544 int i; 1545 1546 corr = 0; 1547 hit = 0; 1548 i = (sp == NULL) ? 0 : sp->leapcnt; 1549 while (--i >= 0) { 1550 lp = &sp->lsis[i]; 1551 if (*timep >= lp->ls_trans) { 1552 if (*timep == lp->ls_trans) { 1553 hit = ((i == 0 && lp->ls_corr > 0) || 1554 lp->ls_corr > sp->lsis[i - 1].ls_corr); 1555 if (hit) 1556 while (i > 0 && 1557 sp->lsis[i].ls_trans == 1558 sp->lsis[i - 1].ls_trans + 1 && 1559 sp->lsis[i].ls_corr == 1560 sp->lsis[i - 1].ls_corr + 1) { 1561 ++hit; 1562 --i; 1563 } 1564 } 1565 corr = lp->ls_corr; 1566 break; 1567 } 1568 } 1569 y = EPOCH_YEAR; 1570 tdays = (time_t)(*timep / SECSPERDAY); 1571 rem = (long) (*timep - tdays * SECSPERDAY); 1572 while (tdays < 0 || tdays >= year_lengths[isleap(y)]) { 1573 int newy; 1574 time_t tdelta; 1575 int idelta; 1576 int leapdays; 1577 1578 tdelta = tdays / DAYSPERLYEAR; 1579 idelta = (int) tdelta; 1580 if (tdelta - idelta >= 1 || idelta - tdelta >= 1) 1581 return NULL; 1582 if (idelta == 0) 1583 idelta = (tdays < 0) ? -1 : 1; 1584 newy = y; 1585 if (increment_overflow(&newy, idelta)) 1586 return NULL; 1587 leapdays = leaps_thru_end_of(newy - 1) - 1588 leaps_thru_end_of(y - 1); 1589 tdays -= ((time_t) newy - y) * DAYSPERNYEAR; 1590 tdays -= leapdays; 1591 y = newy; 1592 } 1593 { 1594 long seconds; 1595 1596 seconds = tdays * SECSPERDAY + 0.5; 1597 tdays = (time_t)(seconds / SECSPERDAY); 1598 rem += (long) (seconds - tdays * SECSPERDAY); 1599 } 1600 /* 1601 ** Given the range, we can now fearlessly cast... 1602 */ 1603 idays = (int) tdays; 1604 rem += offset - corr; 1605 while (rem < 0) { 1606 rem += SECSPERDAY; 1607 --idays; 1608 } 1609 while (rem >= SECSPERDAY) { 1610 rem -= SECSPERDAY; 1611 ++idays; 1612 } 1613 while (idays < 0) { 1614 if (increment_overflow(&y, -1)) 1615 return NULL; 1616 idays += year_lengths[isleap(y)]; 1617 } 1618 while (idays >= year_lengths[isleap(y)]) { 1619 idays -= year_lengths[isleap(y)]; 1620 if (increment_overflow(&y, 1)) 1621 return NULL; 1622 } 1623 tmp->tm_year = y; 1624 if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE)) 1625 return NULL; 1626 tmp->tm_yday = idays; 1627 /* 1628 ** The "extra" mods below avoid overflow problems. 1629 */ 1630 tmp->tm_wday = EPOCH_WDAY + 1631 ((y - EPOCH_YEAR) % DAYSPERWEEK) * 1632 (DAYSPERNYEAR % DAYSPERWEEK) + 1633 leaps_thru_end_of(y - 1) - 1634 leaps_thru_end_of(EPOCH_YEAR - 1) + 1635 idays; 1636 tmp->tm_wday %= DAYSPERWEEK; 1637 if (tmp->tm_wday < 0) 1638 tmp->tm_wday += DAYSPERWEEK; 1639 tmp->tm_hour = (int) (rem / SECSPERHOUR); 1640 rem %= SECSPERHOUR; 1641 tmp->tm_min = (int) (rem / SECSPERMIN); 1642 /* 1643 ** A positive leap second requires a special 1644 ** representation. This uses "... ??:59:60" et seq. 1645 */ 1646 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; 1647 ip = mon_lengths[isleap(y)]; 1648 for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon)) 1649 idays -= ip[tmp->tm_mon]; 1650 tmp->tm_mday = (int) (idays + 1); 1651 tmp->tm_isdst = 0; 1652 #ifdef TM_GMTOFF 1653 tmp->TM_GMTOFF = offset; 1654 #endif /* defined TM_GMTOFF */ 1655 return tmp; 1656 } 1657 1658 char * 1659 ctime(const time_t *const timep) 1660 { 1661 /* 1662 ** Section 4.12.3.2 of X3.159-1989 requires that 1663 ** The ctime function converts the calendar time pointed to by timer 1664 ** to local time in the form of a string. It is equivalent to 1665 ** asctime(localtime(timer)) 1666 */ 1667 struct tm *rtm = localtime(timep); 1668 if (rtm == NULL) 1669 return NULL; 1670 return asctime(rtm); 1671 } 1672 1673 char * 1674 ctime_r(const time_t *const timep, char *buf) 1675 { 1676 struct tm mytm, *rtm; 1677 1678 rtm = localtime_r(timep, &mytm); 1679 if (rtm == NULL) 1680 return NULL; 1681 return asctime_r(rtm, buf); 1682 } 1683 1684 char * 1685 ctime_rz(const timezone_t sp, const time_t * timep, char *buf) 1686 { 1687 struct tm mytm, *rtm; 1688 1689 rtm = localtime_rz(sp, timep, &mytm); 1690 if (rtm == NULL) 1691 return NULL; 1692 return asctime_r(rtm, buf); 1693 } 1694 1695 /* 1696 ** Adapted from code provided by Robert Elz, who writes: 1697 ** The "best" way to do mktime I think is based on an idea of Bob 1698 ** Kridle's (so its said...) from a long time ago. 1699 ** It does a binary search of the time_t space. Since time_t's are 1700 ** just 32 bits, its a max of 32 iterations (even at 64 bits it 1701 ** would still be very reasonable). 1702 */ 1703 1704 #ifndef WRONG 1705 #define WRONG ((time_t)-1) 1706 #endif /* !defined WRONG */ 1707 1708 /* 1709 ** Simplified normalize logic courtesy Paul Eggert. 1710 */ 1711 1712 static int 1713 increment_overflow(int *const ip, int j) 1714 { 1715 int i = *ip; 1716 1717 /* 1718 ** If i >= 0 there can only be overflow if i + j > INT_MAX 1719 ** or if j > INT_MAX - i; given i >= 0, INT_MAX - i cannot overflow. 1720 ** If i < 0 there can only be overflow if i + j < INT_MIN 1721 ** or if j < INT_MIN - i; given i < 0, INT_MIN - i cannot overflow. 1722 */ 1723 if ((i >= 0) ? (j > INT_MAX - i) : (j < INT_MIN - i)) 1724 return TRUE; 1725 *ip += j; 1726 return FALSE; 1727 } 1728 1729 static int 1730 long_increment_overflow(long *const lp, int m) 1731 { 1732 long l = *lp; 1733 1734 if ((l >= 0) ? (m > LONG_MAX - l) : (m < LONG_MIN - l)) 1735 return TRUE; 1736 *lp += m; 1737 return FALSE; 1738 } 1739 1740 static int 1741 normalize_overflow(int *const tensptr, int *const unitsptr, const int base) 1742 { 1743 int tensdelta; 1744 1745 tensdelta = (*unitsptr >= 0) ? 1746 (*unitsptr / base) : 1747 (-1 - (-1 - *unitsptr) / base); 1748 *unitsptr -= tensdelta * base; 1749 return increment_overflow(tensptr, tensdelta); 1750 } 1751 1752 static int 1753 long_normalize_overflow(long *const tensptr, int *const unitsptr, 1754 const int base) 1755 { 1756 int tensdelta; 1757 1758 tensdelta = (*unitsptr >= 0) ? 1759 (*unitsptr / base) : 1760 (-1 - (-1 - *unitsptr) / base); 1761 *unitsptr -= tensdelta * base; 1762 return long_increment_overflow(tensptr, tensdelta); 1763 } 1764 1765 static int 1766 tmcomp(const struct tm *const atmp, const struct tm *const btmp) 1767 { 1768 int result; 1769 1770 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && 1771 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && 1772 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && 1773 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && 1774 (result = (atmp->tm_min - btmp->tm_min)) == 0) 1775 result = atmp->tm_sec - btmp->tm_sec; 1776 return result; 1777 } 1778 1779 static time_t 1780 time2sub(const timezone_t sp, struct tm *const tmp, subfun_t funcp, 1781 const long offset, int *const okayp, const int do_norm_secs) 1782 { 1783 int dir; 1784 int i, j; 1785 int saved_seconds; 1786 long li; 1787 time_t lo; 1788 time_t hi; 1789 #ifdef NO_ERROR_IN_DST_GAP 1790 time_t ilo; 1791 #endif 1792 long y; 1793 time_t newt; 1794 time_t t; 1795 struct tm yourtm, mytm; 1796 1797 *okayp = FALSE; 1798 yourtm = *tmp; 1799 #ifdef NO_ERROR_IN_DST_GAP 1800 again: 1801 #endif 1802 if (do_norm_secs) { 1803 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec, 1804 SECSPERMIN)) 1805 goto overflow; 1806 } 1807 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) 1808 goto overflow; 1809 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) 1810 goto overflow; 1811 y = yourtm.tm_year; 1812 if (long_normalize_overflow(&y, &yourtm.tm_mon, MONSPERYEAR)) 1813 goto overflow; 1814 /* 1815 ** Turn y into an actual year number for now. 1816 ** It is converted back to an offset from TM_YEAR_BASE later. 1817 */ 1818 if (long_increment_overflow(&y, TM_YEAR_BASE)) 1819 goto overflow; 1820 while (yourtm.tm_mday <= 0) { 1821 if (long_increment_overflow(&y, -1)) 1822 goto overflow; 1823 li = y + (1 < yourtm.tm_mon); 1824 yourtm.tm_mday += year_lengths[isleap(li)]; 1825 } 1826 while (yourtm.tm_mday > DAYSPERLYEAR) { 1827 li = y + (1 < yourtm.tm_mon); 1828 yourtm.tm_mday -= year_lengths[isleap(li)]; 1829 if (long_increment_overflow(&y, 1)) 1830 goto overflow; 1831 } 1832 for ( ; ; ) { 1833 i = mon_lengths[isleap(y)][yourtm.tm_mon]; 1834 if (yourtm.tm_mday <= i) 1835 break; 1836 yourtm.tm_mday -= i; 1837 if (++yourtm.tm_mon >= MONSPERYEAR) { 1838 yourtm.tm_mon = 0; 1839 if (long_increment_overflow(&y, 1)) 1840 goto overflow; 1841 } 1842 } 1843 if (long_increment_overflow(&y, -TM_YEAR_BASE)) 1844 goto overflow; 1845 yourtm.tm_year = (int)y; 1846 if (yourtm.tm_year != y) 1847 goto overflow; 1848 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN) 1849 saved_seconds = 0; 1850 else if (y + TM_YEAR_BASE < EPOCH_YEAR) { 1851 /* 1852 ** We can't set tm_sec to 0, because that might push the 1853 ** time below the minimum representable time. 1854 ** Set tm_sec to 59 instead. 1855 ** This assumes that the minimum representable time is 1856 ** not in the same minute that a leap second was deleted from, 1857 ** which is a safer assumption than using 58 would be. 1858 */ 1859 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) 1860 goto overflow; 1861 saved_seconds = yourtm.tm_sec; 1862 yourtm.tm_sec = SECSPERMIN - 1; 1863 } else { 1864 saved_seconds = yourtm.tm_sec; 1865 yourtm.tm_sec = 0; 1866 } 1867 /* 1868 ** Do a binary search (this works whatever time_t's type is). 1869 */ 1870 /* CONSTCOND */ 1871 if (!TYPE_SIGNED(time_t)) { 1872 lo = 0; 1873 hi = lo - 1; 1874 /* CONSTCOND */ 1875 } else if (!TYPE_INTEGRAL(time_t)) { 1876 /* CONSTCOND */ 1877 if (sizeof(time_t) > sizeof(float)) 1878 /* LINTED assumed double */ 1879 hi = (time_t) DBL_MAX; 1880 /* LINTED assumed float */ 1881 else hi = (time_t) FLT_MAX; 1882 lo = -hi; 1883 } else { 1884 lo = 1; 1885 for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i) 1886 lo *= 2; 1887 hi = -(lo + 1); 1888 } 1889 #ifdef NO_ERROR_IN_DST_GAP 1890 ilo = lo; 1891 #endif 1892 for ( ; ; ) { 1893 t = lo / 2 + hi / 2; 1894 if (t < lo) 1895 t = lo; 1896 else if (t > hi) 1897 t = hi; 1898 if ((*funcp)(sp, &t, offset, &mytm) == NULL) { 1899 /* 1900 ** Assume that t is too extreme to be represented in 1901 ** a struct tm; arrange things so that it is less 1902 ** extreme on the next pass. 1903 */ 1904 dir = (t > 0) ? 1 : -1; 1905 } else dir = tmcomp(&mytm, &yourtm); 1906 if (dir != 0) { 1907 if (t == lo) { 1908 ++t; 1909 if (t <= lo) 1910 goto overflow; 1911 ++lo; 1912 } else if (t == hi) { 1913 --t; 1914 if (t >= hi) 1915 goto overflow; 1916 --hi; 1917 } 1918 #ifdef NO_ERROR_IN_DST_GAP 1919 if (ilo != lo && lo - 1 == hi && yourtm.tm_isdst < 0 && 1920 do_norm_secs) { 1921 for (i = sp->typecnt - 1; i >= 0; --i) { 1922 for (j = sp->typecnt - 1; j >= 0; --j) { 1923 time_t off; 1924 if (sp->ttis[j].tt_isdst == 1925 sp->ttis[i].tt_isdst) 1926 continue; 1927 off = sp->ttis[j].tt_gmtoff - 1928 sp->ttis[i].tt_gmtoff; 1929 yourtm.tm_sec += off < 0 ? 1930 -off : off; 1931 goto again; 1932 } 1933 } 1934 } 1935 #endif 1936 if (lo > hi) 1937 goto invalid; 1938 if (dir > 0) 1939 hi = t; 1940 else lo = t; 1941 continue; 1942 } 1943 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) 1944 break; 1945 /* 1946 ** Right time, wrong type. 1947 ** Hunt for right time, right type. 1948 ** It's okay to guess wrong since the guess 1949 ** gets checked. 1950 */ 1951 if (sp == NULL) 1952 goto invalid; 1953 for (i = sp->typecnt - 1; i >= 0; --i) { 1954 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) 1955 continue; 1956 for (j = sp->typecnt - 1; j >= 0; --j) { 1957 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) 1958 continue; 1959 newt = (time_t)(t + sp->ttis[j].tt_gmtoff - 1960 sp->ttis[i].tt_gmtoff); 1961 if ((*funcp)(sp, &newt, offset, &mytm) == NULL) 1962 continue; 1963 if (tmcomp(&mytm, &yourtm) != 0) 1964 continue; 1965 if (mytm.tm_isdst != yourtm.tm_isdst) 1966 continue; 1967 /* 1968 ** We have a match. 1969 */ 1970 t = newt; 1971 goto label; 1972 } 1973 } 1974 goto invalid; 1975 } 1976 label: 1977 newt = t + saved_seconds; 1978 if ((newt < t) != (saved_seconds < 0)) 1979 goto overflow; 1980 t = newt; 1981 if ((*funcp)(sp, &t, offset, tmp)) { 1982 *okayp = TRUE; 1983 return t; 1984 } 1985 overflow: 1986 errno = EOVERFLOW; 1987 return WRONG; 1988 invalid: 1989 errno = EINVAL; 1990 return WRONG; 1991 } 1992 1993 static time_t 1994 time2(const timezone_t sp, struct tm *const tmp, subfun_t funcp, 1995 const long offset, int *const okayp) 1996 { 1997 time_t t; 1998 1999 /* 2000 ** First try without normalization of seconds 2001 ** (in case tm_sec contains a value associated with a leap second). 2002 ** If that fails, try with normalization of seconds. 2003 */ 2004 t = time2sub(sp, tmp, funcp, offset, okayp, FALSE); 2005 return *okayp ? t : time2sub(sp, tmp, funcp, offset, okayp, TRUE); 2006 } 2007 2008 static time_t 2009 time1(const timezone_t sp, struct tm *const tmp, subfun_t funcp, 2010 const long offset) 2011 { 2012 time_t t; 2013 int samei, otheri; 2014 int sameind, otherind; 2015 int i; 2016 int nseen; 2017 int seen[TZ_MAX_TYPES]; 2018 int types[TZ_MAX_TYPES]; 2019 int okay; 2020 2021 if (tmp == NULL) { 2022 errno = EINVAL; 2023 return WRONG; 2024 } 2025 if (tmp->tm_isdst > 1) 2026 tmp->tm_isdst = 1; 2027 t = time2(sp, tmp, funcp, offset, &okay); 2028 #ifdef PCTS 2029 /* 2030 ** PCTS code courtesy Grant Sullivan. 2031 */ 2032 if (okay) 2033 return t; 2034 if (tmp->tm_isdst < 0) 2035 tmp->tm_isdst = 0; /* reset to std and try again */ 2036 #endif /* defined PCTS */ 2037 #ifndef PCTS 2038 if (okay || tmp->tm_isdst < 0) 2039 return t; 2040 #endif /* !defined PCTS */ 2041 /* 2042 ** We're supposed to assume that somebody took a time of one type 2043 ** and did some math on it that yielded a "struct tm" that's bad. 2044 ** We try to divine the type they started from and adjust to the 2045 ** type they need. 2046 */ 2047 if (sp == NULL) { 2048 errno = EINVAL; 2049 return WRONG; 2050 } 2051 for (i = 0; i < sp->typecnt; ++i) 2052 seen[i] = FALSE; 2053 nseen = 0; 2054 for (i = sp->timecnt - 1; i >= 0; --i) 2055 if (!seen[sp->types[i]]) { 2056 seen[sp->types[i]] = TRUE; 2057 types[nseen++] = sp->types[i]; 2058 } 2059 for (sameind = 0; sameind < nseen; ++sameind) { 2060 samei = types[sameind]; 2061 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) 2062 continue; 2063 for (otherind = 0; otherind < nseen; ++otherind) { 2064 otheri = types[otherind]; 2065 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) 2066 continue; 2067 tmp->tm_sec += (int)(sp->ttis[otheri].tt_gmtoff - 2068 sp->ttis[samei].tt_gmtoff); 2069 tmp->tm_isdst = !tmp->tm_isdst; 2070 t = time2(sp, tmp, funcp, offset, &okay); 2071 if (okay) 2072 return t; 2073 tmp->tm_sec -= (int)(sp->ttis[otheri].tt_gmtoff - 2074 sp->ttis[samei].tt_gmtoff); 2075 tmp->tm_isdst = !tmp->tm_isdst; 2076 } 2077 } 2078 errno = EOVERFLOW; 2079 return WRONG; 2080 } 2081 2082 time_t 2083 mktime_z(const timezone_t sp, struct tm *const tmp) 2084 { 2085 time_t t; 2086 if (sp == NULL) 2087 t = time1(NULL, tmp, gmtsub, 0L); 2088 else 2089 t = time1(sp, tmp, localsub, 0L); 2090 return t; 2091 } 2092 2093 time_t 2094 mktime(struct tm *const tmp) 2095 { 2096 time_t result; 2097 2098 rwlock_wrlock(&lcl_lock); 2099 tzset_unlocked(); 2100 result = mktime_z(lclptr, tmp); 2101 rwlock_unlock(&lcl_lock); 2102 return result; 2103 } 2104 2105 #ifdef STD_INSPIRED 2106 2107 time_t 2108 timelocal_z(const timezone_t sp, struct tm *const tmp) 2109 { 2110 if (tmp != NULL) 2111 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 2112 return mktime_z(sp, tmp); 2113 } 2114 2115 time_t 2116 timelocal(struct tm *const tmp) 2117 { 2118 if (tmp != NULL) 2119 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 2120 return mktime(tmp); 2121 } 2122 2123 time_t 2124 timegm(struct tm *const tmp) 2125 { 2126 time_t t; 2127 2128 if (tmp != NULL) 2129 tmp->tm_isdst = 0; 2130 t = time1(gmtptr, tmp, gmtsub, 0L); 2131 return t; 2132 } 2133 2134 time_t 2135 timeoff(struct tm *const tmp, const long offset) 2136 { 2137 time_t t; 2138 2139 if (tmp != NULL) 2140 tmp->tm_isdst = 0; 2141 t = time1(gmtptr, tmp, gmtsub, offset); 2142 return t; 2143 } 2144 2145 #endif /* defined STD_INSPIRED */ 2146 2147 #ifdef CMUCS 2148 2149 /* 2150 ** The following is supplied for compatibility with 2151 ** previous versions of the CMUCS runtime library. 2152 */ 2153 2154 long 2155 gtime(struct tm *const tmp) 2156 { 2157 const time_t t = mktime(tmp); 2158 2159 if (t == WRONG) 2160 return -1; 2161 return t; 2162 } 2163 2164 #endif /* defined CMUCS */ 2165 2166 /* 2167 ** XXX--is the below the right way to conditionalize?? 2168 */ 2169 2170 #ifdef STD_INSPIRED 2171 2172 /* 2173 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 2174 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which 2175 ** is not the case if we are accounting for leap seconds. 2176 ** So, we provide the following conversion routines for use 2177 ** when exchanging timestamps with POSIX conforming systems. 2178 */ 2179 2180 static long 2181 leapcorr(const timezone_t sp, time_t *timep) 2182 { 2183 struct lsinfo * lp; 2184 int i; 2185 2186 i = sp->leapcnt; 2187 while (--i >= 0) { 2188 lp = &sp->lsis[i]; 2189 if (*timep >= lp->ls_trans) 2190 return lp->ls_corr; 2191 } 2192 return 0; 2193 } 2194 2195 time_t 2196 time2posix_z(const timezone_t sp, time_t t) 2197 { 2198 return (time_t)(t - leapcorr(sp, &t)); 2199 } 2200 2201 time_t 2202 time2posix(time_t t) 2203 { 2204 time_t result; 2205 rwlock_wrlock(&lcl_lock); 2206 tzset_unlocked(); 2207 result = (time_t)(t - leapcorr(lclptr, &t)); 2208 rwlock_unlock(&lcl_lock); 2209 return (result); 2210 } 2211 2212 time_t 2213 posix2time_z(const timezone_t sp, time_t t) 2214 { 2215 time_t x; 2216 time_t y; 2217 2218 /* 2219 ** For a positive leap second hit, the result 2220 ** is not unique. For a negative leap second 2221 ** hit, the corresponding time doesn't exist, 2222 ** so we return an adjacent second. 2223 */ 2224 x = (time_t)(t + leapcorr(sp, &t)); 2225 y = (time_t)(x - leapcorr(sp, &x)); 2226 if (y < t) { 2227 do { 2228 x++; 2229 y = (time_t)(x - leapcorr(sp, &x)); 2230 } while (y < t); 2231 if (t != y) { 2232 return x - 1; 2233 } 2234 } else if (y > t) { 2235 do { 2236 --x; 2237 y = (time_t)(x - leapcorr(sp, &x)); 2238 } while (y > t); 2239 if (t != y) { 2240 return x + 1; 2241 } 2242 } 2243 return x; 2244 } 2245 2246 2247 2248 time_t 2249 posix2time(time_t t) 2250 { 2251 time_t result; 2252 2253 rwlock_wrlock(&lcl_lock); 2254 tzset_unlocked(); 2255 result = posix2time_z(lclptr, t); 2256 rwlock_unlock(&lcl_lock); 2257 return result; 2258 } 2259 2260 #endif /* defined STD_INSPIRED */ 2261
Indexes created Wed Sep 24 05:09:52 GMT 2025