1 /* 2 ** This file is in the public domain, so clarified as of 3 ** 1996-06-05 by Arthur David Olson. 4 */ 5 6 /* 7 ** Leap second handling from Bradley White. 8 ** POSIX-style TZ environment variable handling from Guy Harris. 9 */ 10 11 /*LINTLIBRARY*/ 12 13 #include "private.h" 14 #include "tzfile.h" 15 #include "fcntl.h" 16 #include "float.h" /* for FLT_MAX and DBL_MAX */ 17 18 #ifndef TZ_ABBR_MAX_LEN 19 #define TZ_ABBR_MAX_LEN 16 20 #endif /* !defined TZ_ABBR_MAX_LEN */ 21 22 #ifndef TZ_ABBR_CHAR_SET 23 #define TZ_ABBR_CHAR_SET \ 24 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._" 25 #endif /* !defined TZ_ABBR_CHAR_SET */ 26 27 #ifndef TZ_ABBR_ERR_CHAR 28 #define TZ_ABBR_ERR_CHAR '_' 29 #endif /* !defined TZ_ABBR_ERR_CHAR */ 30 31 /* 32 ** SunOS 4.1.1 headers lack O_BINARY. 33 */ 34 35 #ifdef O_BINARY 36 #define OPEN_MODE (O_RDONLY | O_BINARY) 37 #endif /* defined O_BINARY */ 38 #ifndef O_BINARY 39 #define OPEN_MODE O_RDONLY 40 #endif /* !defined O_BINARY */ 41 42 #if 0 43 # define XLOG(xx) printf xx , fflush(stdout) 44 #else 45 # define XLOG(x) do{}while (0) 46 #endif 47 48 /* BEGIN android-added: thread-safety. */ 49 #include <pthread.h> 50 static pthread_mutex_t _tzMutex = PTHREAD_MUTEX_INITIALIZER; 51 static inline void _tzLock(void) { pthread_mutex_lock(&_tzMutex); } 52 static inline void _tzUnlock(void) { pthread_mutex_unlock(&_tzMutex); } 53 /* END android-added */ 54 55 #ifndef WILDABBR 56 /* 57 ** Someone might make incorrect use of a time zone abbreviation: 58 ** 1. They might reference tzname[0] before calling tzset (explicitly 59 ** or implicitly). 60 ** 2. They might reference tzname[1] before calling tzset (explicitly 61 ** or implicitly). 62 ** 3. They might reference tzname[1] after setting to a time zone 63 ** in which Daylight Saving Time is never observed. 64 ** 4. They might reference tzname[0] after setting to a time zone 65 ** in which Standard Time is never observed. 66 ** 5. They might reference tm.TM_ZONE after calling offtime. 67 ** What's best to do in the above cases is open to debate; 68 ** for now, we just set things up so that in any of the five cases 69 ** WILDABBR is used. Another possibility: initialize tzname[0] to the 70 ** string "tzname[0] used before set", and similarly for the other cases. 71 ** And another: initialize tzname[0] to "ERA", with an explanation in the 72 ** manual page of what this "time zone abbreviation" means (doing this so 73 ** that tzname[0] has the "normal" length of three characters). 74 */ 75 #define WILDABBR " " 76 #endif /* !defined WILDABBR */ 77 78 static char wildabbr[] = WILDABBR; 79 80 static const char gmt[] = "GMT"; 81 82 /* 83 ** The DST rules to use if TZ has no rules and we can't load TZDEFRULES. 84 ** We default to US rules as of 1999-08-17. 85 ** POSIX 1003.1 section 8.1.1 says that the default DST rules are 86 ** implementation dependent; for historical reasons, US rules are a 87 ** common default. 88 */ 89 #ifndef TZDEFRULESTRING 90 #define TZDEFRULESTRING ",M4.1.0,M10.5.0" 91 #endif /* !defined TZDEFDST */ 92 93 struct ttinfo { /* time type information */ 94 int_fast32_t tt_gmtoff; /* UTC offset in seconds */ 95 int tt_isdst; /* used to set tm_isdst */ 96 int tt_abbrind; /* abbreviation list index */ 97 int tt_ttisstd; /* TRUE if transition is std time */ 98 int tt_ttisgmt; /* TRUE if transition is UTC */ 99 }; 100 101 struct lsinfo { /* leap second information */ 102 time_t ls_trans; /* transition time */ 103 int_fast64_t ls_corr; /* correction to apply */ 104 }; 105 106 #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) 107 108 #ifdef TZNAME_MAX 109 #define MY_TZNAME_MAX TZNAME_MAX 110 #endif /* defined TZNAME_MAX */ 111 #ifndef TZNAME_MAX 112 #define MY_TZNAME_MAX 255 113 #endif /* !defined TZNAME_MAX */ 114 115 struct state { 116 int leapcnt; 117 int timecnt; 118 int typecnt; 119 int charcnt; 120 int goback; 121 int goahead; 122 time_t ats[TZ_MAX_TIMES]; 123 unsigned char types[TZ_MAX_TIMES]; 124 struct ttinfo ttis[TZ_MAX_TYPES]; 125 char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt), 126 (2 * (MY_TZNAME_MAX + 1)))]; 127 struct lsinfo lsis[TZ_MAX_LEAPS]; 128 int defaulttype; /* for early times or if no transitions */ 129 }; 130 131 struct rule { 132 int r_type; /* type of rule--see below */ 133 int r_day; /* day number of rule */ 134 int r_week; /* week number of rule */ 135 int r_mon; /* month number of rule */ 136 int_fast32_t r_time; /* transition time of rule */ 137 }; 138 139 #define JULIAN_DAY 0 /* Jn - Julian day */ 140 #define DAY_OF_YEAR 1 /* n - day of year */ 141 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */ 142 143 /* 144 ** Prototypes for static functions. 145 */ 146 147 /* NOTE: all internal functions assume that _tzLock() was already called */ 148 149 static int __bionic_open_tzdata(const char*, int*); 150 static int_fast32_t detzcode(const char * codep); 151 static time_t detzcode64(const char * codep); 152 static int differ_by_repeat(time_t t1, time_t t0); 153 static const char * getzname(const char * strp) ATTRIBUTE_PURE; 154 static const char * getqzname(const char * strp, const int delim) 155 ATTRIBUTE_PURE; 156 static const char * getnum(const char * strp, int * nump, int min, 157 int max); 158 static const char * getsecs(const char * strp, int_fast32_t * secsp); 159 static const char * getoffset(const char * strp, int_fast32_t * offsetp); 160 static const char * getrule(const char * strp, struct rule * rulep); 161 static void gmtload(struct state * sp); 162 static struct tm * gmtsub(const time_t * timep, const int_fast32_t offset, 163 struct tm * tmp, const struct state * sp); // android-changed: added sp. 164 static struct tm * localsub(const time_t * timep, int_fast32_t offset, 165 struct tm * tmp, const struct state * sp); // android-changed: added sp. 166 static int increment_overflow(int * number, int delta); 167 static int leaps_thru_end_of(int y) ATTRIBUTE_PURE; 168 static int increment_overflow32(int_fast32_t * number, int delta); 169 static int normalize_overflow32(int_fast32_t * tensptr, 170 int * unitsptr, int base); 171 static int normalize_overflow(int * tensptr, int * unitsptr, 172 int base); 173 static void settzname(void); 174 static time_t time1(struct tm * tmp, 175 struct tm * (*funcp)(const time_t *, 176 int_fast32_t, struct tm *, const struct state *), // android-changed: added state*. 177 int_fast32_t offset, const struct state * sp); // android-changed: added sp. 178 static time_t time2(struct tm * const tmp, 179 struct tm * (*const funcp)(const time_t *, 180 int_fast32_t, struct tm*, const struct state *), // android-changed: added state*. 181 int_fast32_t offset, int * okayp, const struct state * sp); // android-changed: added sp. 182 static time_t time2sub(struct tm *tmp, 183 struct tm * (*funcp) (const time_t *, 184 int_fast32_t, struct tm*, const struct state *), // android-changed: added state*. 185 int_fast32_t offset, int * okayp, int do_norm_secs, const struct state * sp); // android-change: added sp. 186 static struct tm * timesub(const time_t * timep, int_fast32_t offset, 187 const struct state * sp, 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, int_fast32_t offset) 192 ATTRIBUTE_PURE; 193 static int typesequiv(const struct state * sp, int a, int b); 194 static int tzload(const char * name, struct state * sp, 195 int doextend); 196 static int tzparse(const char * name, struct state * sp, 197 int lastditch); 198 199 #ifdef ALL_STATE 200 static struct state * lclptr; 201 static struct state * gmtptr; 202 #endif /* defined ALL_STATE */ 203 204 #ifndef ALL_STATE 205 static struct state lclmem; 206 static struct state gmtmem; 207 #define lclptr (&lclmem) 208 #define gmtptr (&gmtmem) 209 #endif /* State Farm */ 210 211 #ifndef TZ_STRLEN_MAX 212 #define TZ_STRLEN_MAX 255 213 #endif /* !defined TZ_STRLEN_MAX */ 214 215 static char lcl_TZname[TZ_STRLEN_MAX + 1]; 216 static int lcl_is_set; 217 static int gmt_is_set; 218 219 char * tzname[2] = { 220 wildabbr, 221 wildabbr 222 }; 223 224 /* 225 ** Section 4.12.3 of X3.159-1989 requires that 226 ** Except for the strftime function, these functions [asctime, 227 ** ctime, gmtime, localtime] return values in one of two static 228 ** objects: a broken-down time structure and an array of char. 229 ** Thanks to Paul Eggert for noting this. 230 */ 231 232 static struct tm tmGlobal; 233 234 #ifdef USG_COMPAT 235 time_t timezone = 0; 236 int daylight = 0; 237 #endif /* defined USG_COMPAT */ 238 239 #ifdef ALTZONE 240 time_t altzone = 0; 241 #endif /* defined ALTZONE */ 242 243 static int_fast32_t 244 detzcode(const char *const codep) 245 { 246 register int_fast32_t result; 247 register int i; 248 249 result = (codep[0] & 0x80) ? -1 : 0; 250 for (i = 0; i < 4; ++i) 251 result = (result << 8) | (codep[i] & 0xff); 252 return result; 253 } 254 255 static time_t 256 detzcode64(const char *const codep) 257 { 258 register time_t result; 259 register int i; 260 261 result = (codep[0] & 0x80) ? (~(int_fast64_t) 0) : 0; 262 for (i = 0; i < 8; ++i) 263 result = result * 256 + (codep[i] & 0xff); 264 return result; 265 } 266 267 static void 268 settzname(void) 269 { 270 register struct state * const sp = lclptr; 271 register int i; 272 273 tzname[0] = wildabbr; 274 tzname[1] = wildabbr; 275 #ifdef USG_COMPAT 276 daylight = 0; 277 timezone = 0; 278 #endif /* defined USG_COMPAT */ 279 #ifdef ALTZONE 280 altzone = 0; 281 #endif /* defined ALTZONE */ 282 #ifdef ALL_STATE 283 if (sp == NULL) { 284 tzname[0] = tzname[1] = gmt; 285 return; 286 } 287 #endif /* defined ALL_STATE */ 288 /* 289 ** And to get the latest zone names into tzname. . . 290 */ 291 for (i = 0; i < sp->typecnt; ++i) { 292 register const struct ttinfo * const ttisp = &sp->ttis[i]; 293 294 tzname[ttisp->tt_isdst] = &sp->chars[ttisp->tt_abbrind]; 295 } 296 for (i = 0; i < sp->timecnt; ++i) { 297 register const struct ttinfo * const ttisp = 298 &sp->ttis[ 299 sp->types[i]]; 300 301 tzname[ttisp->tt_isdst] = 302 &sp->chars[ttisp->tt_abbrind]; 303 #ifdef USG_COMPAT 304 if (ttisp->tt_isdst) 305 daylight = 1; 306 if (!ttisp->tt_isdst) 307 timezone = -(ttisp->tt_gmtoff); 308 #endif /* defined USG_COMPAT */ 309 #ifdef ALTZONE 310 if (ttisp->tt_isdst) 311 altzone = -(ttisp->tt_gmtoff); 312 #endif /* defined ALTZONE */ 313 } 314 /* 315 ** Finally, scrub the abbreviations. 316 ** First, replace bogus characters. 317 */ 318 for (i = 0; i < sp->charcnt; ++i) 319 if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL) 320 sp->chars[i] = TZ_ABBR_ERR_CHAR; 321 /* 322 ** Second, truncate long abbreviations. 323 */ 324 for (i = 0; i < sp->typecnt; ++i) { 325 register const struct ttinfo * const ttisp = &sp->ttis[i]; 326 register char * cp = &sp->chars[ttisp->tt_abbrind]; 327 328 if (strlen(cp) > TZ_ABBR_MAX_LEN && 329 strcmp(cp, GRANDPARENTED) != 0) 330 *(cp + TZ_ABBR_MAX_LEN) = '\0'; 331 } 332 } 333 334 static int 335 differ_by_repeat(const time_t t1, const time_t t0) 336 { 337 if (TYPE_INTEGRAL(time_t) && 338 TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS) 339 return 0; 340 return t1 - t0 == SECSPERREPEAT; 341 } 342 343 static int 344 tzload(register const char* name, register struct state* const sp, 345 register const int doextend) 346 { 347 register const char * p; 348 register int i; 349 register int fid; 350 register int stored; 351 register int nread; 352 typedef union { 353 struct tzhead tzhead; 354 char buf[2 * sizeof(struct tzhead) + 355 2 * sizeof *sp + 356 4 * TZ_MAX_TIMES]; 357 } u_t; 358 #ifdef ALL_STATE 359 register u_t * up; 360 361 up = (u_t *) calloc(1, sizeof *up); 362 if (up == NULL) 363 return -1; 364 #else /* !defined ALL_STATE */ 365 u_t u; 366 register u_t * const up = &u; 367 #endif /* !defined ALL_STATE */ 368 369 sp->goback = sp->goahead = FALSE; 370 if (name == NULL && (name = TZDEFAULT) == NULL) 371 goto oops; 372 int toread; 373 fid = __bionic_open_tzdata(name, &toread); 374 if (fid < 0) { 375 return -1; 376 } 377 nread = read(fid, up->buf, toread); 378 if (close(fid) < 0 || nread <= 0) 379 goto oops; 380 for (stored = 4; stored <= 8; stored *= 2) { 381 int ttisstdcnt; 382 int ttisgmtcnt; 383 384 ttisstdcnt = (int) detzcode(up->tzhead.tzh_ttisstdcnt); 385 ttisgmtcnt = (int) detzcode(up->tzhead.tzh_ttisgmtcnt); 386 sp->leapcnt = (int) detzcode(up->tzhead.tzh_leapcnt); 387 sp->timecnt = (int) detzcode(up->tzhead.tzh_timecnt); 388 sp->typecnt = (int) detzcode(up->tzhead.tzh_typecnt); 389 sp->charcnt = (int) detzcode(up->tzhead.tzh_charcnt); 390 p = up->tzhead.tzh_charcnt + sizeof up->tzhead.tzh_charcnt; 391 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || 392 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || 393 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || 394 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS || 395 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) || 396 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0)) 397 goto oops; 398 if (nread - (p - up->buf) < 399 sp->timecnt * stored + /* ats */ 400 sp->timecnt + /* types */ 401 sp->typecnt * 6 + /* ttinfos */ 402 sp->charcnt + /* chars */ 403 sp->leapcnt * (stored + 4) + /* lsinfos */ 404 ttisstdcnt + /* ttisstds */ 405 ttisgmtcnt) /* ttisgmts */ 406 goto oops; 407 for (i = 0; i < sp->timecnt; ++i) { 408 sp->ats[i] = (stored == 4) ? 409 detzcode(p) : detzcode64(p); 410 p += stored; 411 } 412 for (i = 0; i < sp->timecnt; ++i) { 413 sp->types[i] = (unsigned char) *p++; 414 if (sp->types[i] >= sp->typecnt) 415 goto oops; 416 } 417 for (i = 0; i < sp->typecnt; ++i) { 418 register struct ttinfo * ttisp; 419 420 ttisp = &sp->ttis[i]; 421 ttisp->tt_gmtoff = detzcode(p); 422 p += 4; 423 ttisp->tt_isdst = (unsigned char) *p++; 424 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) 425 goto oops; 426 ttisp->tt_abbrind = (unsigned char) *p++; 427 if (ttisp->tt_abbrind < 0 || 428 ttisp->tt_abbrind > sp->charcnt) 429 goto oops; 430 } 431 for (i = 0; i < sp->charcnt; ++i) 432 sp->chars[i] = *p++; 433 sp->chars[i] = '\0'; /* ensure '\0' at end */ 434 for (i = 0; i < sp->leapcnt; ++i) { 435 register struct lsinfo * lsisp; 436 437 lsisp = &sp->lsis[i]; 438 lsisp->ls_trans = (stored == 4) ? 439 detzcode(p) : detzcode64(p); 440 p += stored; 441 lsisp->ls_corr = detzcode(p); 442 p += 4; 443 } 444 for (i = 0; i < sp->typecnt; ++i) { 445 register struct ttinfo * ttisp; 446 447 ttisp = &sp->ttis[i]; 448 if (ttisstdcnt == 0) 449 ttisp->tt_ttisstd = FALSE; 450 else { 451 ttisp->tt_ttisstd = *p++; 452 if (ttisp->tt_ttisstd != TRUE && 453 ttisp->tt_ttisstd != FALSE) 454 goto oops; 455 } 456 } 457 for (i = 0; i < sp->typecnt; ++i) { 458 register struct ttinfo * ttisp; 459 460 ttisp = &sp->ttis[i]; 461 if (ttisgmtcnt == 0) 462 ttisp->tt_ttisgmt = FALSE; 463 else { 464 ttisp->tt_ttisgmt = *p++; 465 if (ttisp->tt_ttisgmt != TRUE && 466 ttisp->tt_ttisgmt != FALSE) 467 goto oops; 468 } 469 } 470 /* 471 ** Out-of-sort ats should mean we're running on a 472 ** signed time_t system but using a data file with 473 ** unsigned values (or vice versa). 474 */ 475 for (i = 0; i < sp->timecnt; ++i) 476 if ((i < sp->timecnt - 1 && 477 sp->ats[i] > sp->ats[i + 1]) || 478 (i == sp->timecnt - 1 && !TYPE_SIGNED(time_t) && 479 sp->ats[i] > 480 ((stored == 4) ? INT32_MAX : INT64_MAX))) { 481 if (TYPE_SIGNED(time_t)) { 482 /* 483 ** Ignore the end (easy). 484 */ 485 sp->timecnt = i + 1; 486 } else { 487 /* 488 ** Ignore the beginning (harder). 489 */ 490 register int j; 491 492 /* 493 ** Keep the record right before the 494 ** epoch boundary, 495 ** but tweak it so that it starts 496 ** right with the epoch 497 ** (thanks to Doug Bailey). 498 */ 499 sp->ats[i] = 0; 500 for (j = 0; j + i < sp->timecnt; ++j) { 501 sp->ats[j] = sp->ats[j + i]; 502 sp->types[j] = sp->types[j + i]; 503 } 504 sp->timecnt = j; 505 } 506 break; 507 } 508 /* 509 ** If this is an old file, we're done. 510 */ 511 if (up->tzhead.tzh_version[0] == '\0') 512 break; 513 nread -= p - up->buf; 514 for (i = 0; i < nread; ++i) 515 up->buf[i] = p[i]; 516 /* 517 ** If this is a narrow integer time_t system, we're done. 518 */ 519 if (stored >= (int) sizeof(time_t) && TYPE_INTEGRAL(time_t)) 520 break; 521 } 522 if (doextend && nread > 2 && 523 up->buf[0] == '\n' && up->buf[nread - 1] == '\n' && 524 sp->typecnt + 2 <= TZ_MAX_TYPES) { 525 struct state ts; 526 register int result; 527 528 up->buf[nread - 1] = '\0'; 529 result = tzparse(&up->buf[1], &ts, FALSE); 530 if (result == 0 && ts.typecnt == 2 && 531 sp->charcnt + ts.charcnt <= TZ_MAX_CHARS) { 532 for (i = 0; i < 2; ++i) 533 ts.ttis[i].tt_abbrind += 534 sp->charcnt; 535 for (i = 0; i < ts.charcnt; ++i) 536 sp->chars[sp->charcnt++] = 537 ts.chars[i]; 538 i = 0; 539 while (i < ts.timecnt && 540 ts.ats[i] <= 541 sp->ats[sp->timecnt - 1]) 542 ++i; 543 while (i < ts.timecnt && 544 sp->timecnt < TZ_MAX_TIMES) { 545 sp->ats[sp->timecnt] = 546 ts.ats[i]; 547 sp->types[sp->timecnt] = 548 sp->typecnt + 549 ts.types[i]; 550 ++sp->timecnt; 551 ++i; 552 } 553 sp->ttis[sp->typecnt++] = ts.ttis[0]; 554 sp->ttis[sp->typecnt++] = ts.ttis[1]; 555 } 556 } 557 if (sp->timecnt > 1) { 558 for (i = 1; i < sp->timecnt; ++i) 559 if (typesequiv(sp, sp->types[i], sp->types[0]) && 560 differ_by_repeat(sp->ats[i], sp->ats[0])) { 561 sp->goback = TRUE; 562 break; 563 } 564 for (i = sp->timecnt - 2; i >= 0; --i) 565 if (typesequiv(sp, sp->types[sp->timecnt - 1], 566 sp->types[i]) && 567 differ_by_repeat(sp->ats[sp->timecnt - 1], 568 sp->ats[i])) { 569 sp->goahead = TRUE; 570 break; 571 } 572 } 573 /* 574 ** If type 0 is is unused in transitions, 575 ** it's the type to use for early times. 576 */ 577 for (i = 0; i < sp->typecnt; ++i) 578 if (sp->types[i] == 0) 579 break; 580 i = (i >= sp->typecnt) ? 0 : -1; 581 /* 582 ** Absent the above, 583 ** if there are transition times 584 ** and the first transition is to a daylight time 585 ** find the standard type less than and closest to 586 ** the type of the first transition. 587 */ 588 if (i < 0 && sp->timecnt > 0 && sp->ttis[sp->types[0]].tt_isdst) { 589 i = sp->types[0]; 590 while (--i >= 0) 591 if (!sp->ttis[i].tt_isdst) 592 break; 593 } 594 /* 595 ** If no result yet, find the first standard type. 596 ** If there is none, punt to type zero. 597 */ 598 if (i < 0) { 599 i = 0; 600 while (sp->ttis[i].tt_isdst) 601 if (++i >= sp->typecnt) { 602 i = 0; 603 break; 604 } 605 } 606 sp->defaulttype = i; 607 #ifdef ALL_STATE 608 free(up); 609 #endif /* defined ALL_STATE */ 610 return 0; 611 oops: 612 #ifdef ALL_STATE 613 free(up); 614 #endif /* defined ALL_STATE */ 615 return -1; 616 } 617 618 static int 619 typesequiv(const struct state *const sp, const int a, const int b) 620 { 621 register int result; 622 623 if (sp == NULL || 624 a < 0 || a >= sp->typecnt || 625 b < 0 || b >= sp->typecnt) 626 result = FALSE; 627 else { 628 register const struct ttinfo * ap = &sp->ttis[a]; 629 register const struct ttinfo * bp = &sp->ttis[b]; 630 result = ap->tt_gmtoff == bp->tt_gmtoff && 631 ap->tt_isdst == bp->tt_isdst && 632 ap->tt_ttisstd == bp->tt_ttisstd && 633 ap->tt_ttisgmt == bp->tt_ttisgmt && 634 strcmp(&sp->chars[ap->tt_abbrind], 635 &sp->chars[bp->tt_abbrind]) == 0; 636 } 637 return result; 638 } 639 640 static const int mon_lengths[2][MONSPERYEAR] = { 641 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 642 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } 643 }; 644 645 static const int year_lengths[2] = { 646 DAYSPERNYEAR, DAYSPERLYEAR 647 }; 648 649 /* 650 ** Given a pointer into a time zone string, scan until a character that is not 651 ** a valid character in a zone name is found. Return a pointer to that 652 ** character. 653 */ 654 655 static const char * 656 getzname(register const char * strp) 657 { 658 register char c; 659 660 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && 661 c != '+') 662 ++strp; 663 return strp; 664 } 665 666 /* 667 ** Given a pointer into an extended time zone string, scan until the ending 668 ** delimiter of the zone name is located. Return a pointer to the delimiter. 669 ** 670 ** As with getzname above, the legal character set is actually quite 671 ** restricted, with other characters producing undefined results. 672 ** We don't do any checking here; checking is done later in common-case code. 673 */ 674 675 static const char * 676 getqzname(register const char *strp, const int delim) 677 { 678 register int c; 679 680 while ((c = *strp) != '\0' && c != delim) 681 ++strp; 682 return strp; 683 } 684 685 /* 686 ** Given a pointer into a time zone string, extract a number from that string. 687 ** Check that the number is within a specified range; if it is not, return 688 ** NULL. 689 ** Otherwise, return a pointer to the first character not part of the number. 690 */ 691 692 static const char * 693 getnum(register const char * strp, int * const nump, const int min, const int max) 694 { 695 register char c; 696 register int num; 697 698 if (strp == NULL || !is_digit(c = *strp)) 699 return NULL; 700 num = 0; 701 do { 702 num = num * 10 + (c - '0'); 703 if (num > max) 704 return NULL; /* illegal value */ 705 c = *++strp; 706 } while (is_digit(c)); 707 if (num < min) 708 return NULL; /* illegal value */ 709 *nump = num; 710 return strp; 711 } 712 713 /* 714 ** Given a pointer into a time zone string, extract a number of seconds, 715 ** in hh[:mm[:ss]] form, from the string. 716 ** If any error occurs, return NULL. 717 ** Otherwise, return a pointer to the first character not part of the number 718 ** of seconds. 719 */ 720 721 static const char * 722 getsecs(register const char *strp, int_fast32_t *const secsp) 723 { 724 int num; 725 726 /* 727 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like 728 ** "M10.4.6/26", which does not conform to Posix, 729 ** but which specifies the equivalent of 730 ** ``02:00 on the first Sunday on or after 23 Oct''. 731 */ 732 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); 733 if (strp == NULL) 734 return NULL; 735 *secsp = num * (int_fast32_t) SECSPERHOUR; 736 if (*strp == ':') { 737 ++strp; 738 strp = getnum(strp, &num, 0, MINSPERHOUR - 1); 739 if (strp == NULL) 740 return NULL; 741 *secsp += num * SECSPERMIN; 742 if (*strp == ':') { 743 ++strp; 744 /* `SECSPERMIN' allows for leap seconds. */ 745 strp = getnum(strp, &num, 0, SECSPERMIN); 746 if (strp == NULL) 747 return NULL; 748 *secsp += num; 749 } 750 } 751 return strp; 752 } 753 754 /* 755 ** Given a pointer into a time zone string, extract an offset, in 756 ** [+-]hh[:mm[:ss]] form, from the string. 757 ** If any error occurs, return NULL. 758 ** Otherwise, return a pointer to the first character not part of the time. 759 */ 760 761 static const char * 762 getoffset(register const char *strp, int_fast32_t *const offsetp) 763 { 764 register int neg = 0; 765 766 if (*strp == '-') { 767 neg = 1; 768 ++strp; 769 } else if (*strp == '+') 770 ++strp; 771 strp = getsecs(strp, offsetp); 772 if (strp == NULL) 773 return NULL; /* illegal time */ 774 if (neg) 775 *offsetp = -*offsetp; 776 return strp; 777 } 778 779 /* 780 ** Given a pointer into a time zone string, extract a rule in the form 781 ** date[/time]. See POSIX section 8 for the format of "date" and "time". 782 ** If a valid rule is not found, return NULL. 783 ** Otherwise, return a pointer to the first character not part of the rule. 784 */ 785 786 static const char * 787 getrule(const char * strp, register struct rule * const rulep) 788 { 789 if (*strp == 'J') { 790 /* 791 ** Julian day. 792 */ 793 rulep->r_type = JULIAN_DAY; 794 ++strp; 795 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); 796 } else if (*strp == 'M') { 797 /* 798 ** Month, week, day. 799 */ 800 rulep->r_type = MONTH_NTH_DAY_OF_WEEK; 801 ++strp; 802 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); 803 if (strp == NULL) 804 return NULL; 805 if (*strp++ != '.') 806 return NULL; 807 strp = getnum(strp, &rulep->r_week, 1, 5); 808 if (strp == NULL) 809 return NULL; 810 if (*strp++ != '.') 811 return NULL; 812 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); 813 } else if (is_digit(*strp)) { 814 /* 815 ** Day of year. 816 */ 817 rulep->r_type = DAY_OF_YEAR; 818 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); 819 } else return NULL; /* invalid format */ 820 if (strp == NULL) 821 return NULL; 822 if (*strp == '/') { 823 /* 824 ** Time specified. 825 */ 826 ++strp; 827 strp = getsecs(strp, &rulep->r_time); 828 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ 829 return strp; 830 } 831 832 /* 833 ** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the 834 ** year, a rule, and the offset from UTC at the time that rule takes effect, 835 ** calculate the Epoch-relative time that rule takes effect. 836 */ 837 838 static time_t 839 transtime(const time_t janfirst, const int year, 840 register const struct rule *const rulep, const int_fast32_t offset) 841 { 842 register int leapyear; 843 register time_t value; 844 register int i; 845 int d, m1, yy0, yy1, yy2, dow; 846 847 INITIALIZE(value); 848 leapyear = isleap(year); 849 switch (rulep->r_type) { 850 851 case JULIAN_DAY: 852 /* 853 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap 854 ** years. 855 ** In non-leap years, or if the day number is 59 or less, just 856 ** add SECSPERDAY times the day number-1 to the time of 857 ** January 1, midnight, to get the day. 858 */ 859 value = janfirst + (rulep->r_day - 1) * SECSPERDAY; 860 if (leapyear && rulep->r_day >= 60) 861 value += SECSPERDAY; 862 break; 863 864 case DAY_OF_YEAR: 865 /* 866 ** n - day of year. 867 ** Just add SECSPERDAY times the day number to the time of 868 ** January 1, midnight, to get the day. 869 */ 870 value = janfirst + rulep->r_day * SECSPERDAY; 871 break; 872 873 case MONTH_NTH_DAY_OF_WEEK: 874 /* 875 ** Mm.n.d - nth "dth day" of month m. 876 */ 877 value = janfirst; 878 for (i = 0; i < rulep->r_mon - 1; ++i) 879 value += mon_lengths[leapyear][i] * SECSPERDAY; 880 881 /* 882 ** Use Zeller's Congruence to get day-of-week of first day of 883 ** month. 884 */ 885 m1 = (rulep->r_mon + 9) % 12 + 1; 886 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; 887 yy1 = yy0 / 100; 888 yy2 = yy0 % 100; 889 dow = ((26 * m1 - 2) / 10 + 890 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; 891 if (dow < 0) 892 dow += DAYSPERWEEK; 893 894 /* 895 ** "dow" is the day-of-week of the first day of the month. Get 896 ** the day-of-month (zero-origin) of the first "dow" day of the 897 ** month. 898 */ 899 d = rulep->r_day - dow; 900 if (d < 0) 901 d += DAYSPERWEEK; 902 for (i = 1; i < rulep->r_week; ++i) { 903 if (d + DAYSPERWEEK >= 904 mon_lengths[leapyear][rulep->r_mon - 1]) 905 break; 906 d += DAYSPERWEEK; 907 } 908 909 /* 910 ** "d" is the day-of-month (zero-origin) of the day we want. 911 */ 912 value += d * SECSPERDAY; 913 break; 914 } 915 916 /* 917 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in 918 ** question. To get the Epoch-relative time of the specified local 919 ** time on that day, add the transition time and the current offset 920 ** from UTC. 921 */ 922 return value + rulep->r_time + offset; 923 } 924 925 /* 926 ** Given a POSIX section 8-style TZ string, fill in the rule tables as 927 ** appropriate. 928 */ 929 930 static int 931 tzparse(const char * name, register struct state * const sp, 932 const int lastditch) 933 { 934 const char * stdname; 935 const char * dstname; 936 size_t stdlen; 937 size_t dstlen; 938 int_fast32_t stdoffset; 939 int_fast32_t dstoffset; 940 register time_t * atp; 941 register unsigned char * typep; 942 register char * cp; 943 register int load_result; 944 static struct ttinfo zttinfo; 945 946 INITIALIZE(dstname); 947 stdname = name; 948 if (lastditch) { 949 stdlen = strlen(name); /* length of standard zone name */ 950 name += stdlen; 951 if (stdlen >= sizeof sp->chars) 952 stdlen = (sizeof sp->chars) - 1; 953 stdoffset = 0; 954 } else { 955 if (*name == '<') { 956 name++; 957 stdname = name; 958 name = getqzname(name, '>'); 959 if (*name != '>') 960 return (-1); 961 stdlen = name - stdname; 962 name++; 963 } else { 964 name = getzname(name); 965 stdlen = name - stdname; 966 } 967 if (*name == '\0') 968 return -1; 969 name = getoffset(name, &stdoffset); 970 if (name == NULL) 971 return -1; 972 } 973 load_result = tzload(TZDEFRULES, sp, FALSE); 974 if (load_result != 0) 975 sp->leapcnt = 0; /* so, we're off a little */ 976 if (*name != '\0') { 977 if (*name == '<') { 978 dstname = ++name; 979 name = getqzname(name, '>'); 980 if (*name != '>') 981 return -1; 982 dstlen = name - dstname; 983 name++; 984 } else { 985 dstname = name; 986 name = getzname(name); 987 dstlen = name - dstname; /* length of DST zone name */ 988 } 989 if (*name != '\0' && *name != ',' && *name != ';') { 990 name = getoffset(name, &dstoffset); 991 if (name == NULL) 992 return -1; 993 } else dstoffset = stdoffset - SECSPERHOUR; 994 if (*name == '\0' && load_result != 0) 995 name = TZDEFRULESTRING; 996 if (*name == ',' || *name == ';') { 997 struct rule start; 998 struct rule end; 999 register int year; 1000 register time_t janfirst; 1001 time_t starttime; 1002 time_t endtime; 1003 1004 ++name; 1005 if ((name = getrule(name, &start)) == NULL) 1006 return -1; 1007 if (*name++ != ',') 1008 return -1; 1009 if ((name = getrule(name, &end)) == NULL) 1010 return -1; 1011 if (*name != '\0') 1012 return -1; 1013 sp->typecnt = 2; /* standard time and DST */ 1014 /* 1015 ** Two transitions per year, from EPOCH_YEAR forward. 1016 */ 1017 sp->ttis[0] = sp->ttis[1] = zttinfo; 1018 sp->ttis[0].tt_gmtoff = -dstoffset; 1019 sp->ttis[0].tt_isdst = 1; 1020 sp->ttis[0].tt_abbrind = stdlen + 1; 1021 sp->ttis[1].tt_gmtoff = -stdoffset; 1022 sp->ttis[1].tt_isdst = 0; 1023 sp->ttis[1].tt_abbrind = 0; 1024 atp = sp->ats; 1025 typep = sp->types; 1026 janfirst = 0; 1027 sp->timecnt = 0; 1028 for (year = EPOCH_YEAR; 1029 sp->timecnt + 2 <= TZ_MAX_TIMES; 1030 ++year) { 1031 time_t newfirst; 1032 1033 starttime = transtime(janfirst, year, &start, 1034 stdoffset); 1035 endtime = transtime(janfirst, year, &end, 1036 dstoffset); 1037 if (starttime > endtime) { 1038 *atp++ = endtime; 1039 *typep++ = 1; /* DST ends */ 1040 *atp++ = starttime; 1041 *typep++ = 0; /* DST begins */ 1042 } else { 1043 *atp++ = starttime; 1044 *typep++ = 0; /* DST begins */ 1045 *atp++ = endtime; 1046 *typep++ = 1; /* DST ends */ 1047 } 1048 sp->timecnt += 2; 1049 newfirst = janfirst; 1050 newfirst += year_lengths[isleap(year)] * 1051 SECSPERDAY; 1052 if (newfirst <= janfirst) 1053 break; 1054 janfirst = newfirst; 1055 } 1056 } else { 1057 register int_fast32_t theirstdoffset; 1058 register int_fast32_t theirdstoffset; 1059 register int_fast32_t theiroffset; 1060 register int isdst; 1061 register int i; 1062 register int j; 1063 1064 if (*name != '\0') 1065 return -1; 1066 /* 1067 ** Initial values of theirstdoffset and theirdstoffset. 1068 */ 1069 theirstdoffset = 0; 1070 for (i = 0; i < sp->timecnt; ++i) { 1071 j = sp->types[i]; 1072 if (!sp->ttis[j].tt_isdst) { 1073 theirstdoffset = 1074 -sp->ttis[j].tt_gmtoff; 1075 break; 1076 } 1077 } 1078 theirdstoffset = 0; 1079 for (i = 0; i < sp->timecnt; ++i) { 1080 j = sp->types[i]; 1081 if (sp->ttis[j].tt_isdst) { 1082 theirdstoffset = 1083 -sp->ttis[j].tt_gmtoff; 1084 break; 1085 } 1086 } 1087 /* 1088 ** Initially we're assumed to be in standard time. 1089 */ 1090 isdst = FALSE; 1091 theiroffset = theirstdoffset; 1092 /* 1093 ** Now juggle transition times and types 1094 ** tracking offsets as you do. 1095 */ 1096 for (i = 0; i < sp->timecnt; ++i) { 1097 j = sp->types[i]; 1098 sp->types[i] = sp->ttis[j].tt_isdst; 1099 if (sp->ttis[j].tt_ttisgmt) { 1100 /* No adjustment to transition time */ 1101 } else { 1102 /* 1103 ** If summer time is in effect, and the 1104 ** transition time was not specified as 1105 ** standard time, add the summer time 1106 ** offset to the transition time; 1107 ** otherwise, add the standard time 1108 ** offset to the transition time. 1109 */ 1110 /* 1111 ** Transitions from DST to DDST 1112 ** will effectively disappear since 1113 ** POSIX provides for only one DST 1114 ** offset. 1115 */ 1116 if (isdst && !sp->ttis[j].tt_ttisstd) { 1117 sp->ats[i] += dstoffset - 1118 theirdstoffset; 1119 } else { 1120 sp->ats[i] += stdoffset - 1121 theirstdoffset; 1122 } 1123 } 1124 theiroffset = -sp->ttis[j].tt_gmtoff; 1125 if (sp->ttis[j].tt_isdst) 1126 theirdstoffset = theiroffset; 1127 else theirstdoffset = theiroffset; 1128 } 1129 /* 1130 ** Finally, fill in ttis. 1131 */ 1132 sp->ttis[0] = sp->ttis[1] = zttinfo; 1133 sp->ttis[0].tt_gmtoff = -stdoffset; 1134 sp->ttis[0].tt_isdst = FALSE; 1135 sp->ttis[0].tt_abbrind = 0; 1136 sp->ttis[1].tt_gmtoff = -dstoffset; 1137 sp->ttis[1].tt_isdst = TRUE; 1138 sp->ttis[1].tt_abbrind = stdlen + 1; 1139 sp->typecnt = 2; 1140 } 1141 } else { 1142 dstlen = 0; 1143 sp->typecnt = 1; /* only standard time */ 1144 sp->timecnt = 0; 1145 sp->ttis[0] = zttinfo; 1146 sp->ttis[0].tt_gmtoff = -stdoffset; 1147 sp->ttis[0].tt_isdst = 0; 1148 sp->ttis[0].tt_abbrind = 0; 1149 } 1150 sp->charcnt = stdlen + 1; 1151 if (dstlen != 0) 1152 sp->charcnt += dstlen + 1; 1153 if ((size_t) sp->charcnt > sizeof sp->chars) 1154 return -1; 1155 cp = sp->chars; 1156 (void) strncpy(cp, stdname, stdlen); 1157 cp += stdlen; 1158 *cp++ = '\0'; 1159 if (dstlen != 0) { 1160 (void) strncpy(cp, dstname, dstlen); 1161 *(cp + dstlen) = '\0'; 1162 } 1163 return 0; 1164 } 1165 1166 static void 1167 gmtload(struct state * const sp) 1168 { 1169 if (tzload(gmt, sp, TRUE) != 0) 1170 (void) tzparse(gmt, sp, TRUE); 1171 } 1172 1173 #ifndef STD_INSPIRED 1174 /* 1175 ** A non-static declaration of tzsetwall in a system header file 1176 ** may cause a warning about this upcoming static declaration... 1177 */ 1178 static 1179 #endif /* !defined STD_INSPIRED */ 1180 void 1181 tzsetwall(void) 1182 { 1183 if (lcl_is_set < 0) 1184 return; 1185 lcl_is_set = -1; 1186 1187 #ifdef ALL_STATE 1188 if (lclptr == NULL) { 1189 lclptr = calloc(1, sizeof *lclptr); 1190 if (lclptr == NULL) { 1191 settzname(); /* all we can do */ 1192 return; 1193 } 1194 } 1195 #endif /* defined ALL_STATE */ 1196 if (tzload(NULL, lclptr, TRUE) != 0) 1197 gmtload(lclptr); 1198 settzname(); 1199 } 1200 1201 #include <sys/system_properties.h> // For __system_property_get. 1202 1203 static void 1204 tzset_locked(void) 1205 { 1206 register const char * name = NULL; 1207 1208 name = getenv("TZ"); 1209 1210 // try the "persist.sys.timezone" system property first 1211 static char buf[PROP_VALUE_MAX]; 1212 if (name == NULL && __system_property_get("persist.sys.timezone", buf) > 0) { 1213 name = buf; 1214 } 1215 1216 if (name == NULL) { 1217 tzsetwall(); 1218 return; 1219 } 1220 1221 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) 1222 return; 1223 lcl_is_set = strlen(name) < sizeof lcl_TZname; 1224 if (lcl_is_set) 1225 (void) strcpy(lcl_TZname, name); 1226 1227 #ifdef ALL_STATE 1228 if (lclptr == NULL) { 1229 lclptr = calloc(1, sizeof *lclptr); 1230 if (lclptr == NULL) { 1231 settzname(); /* all we can do */ 1232 return; 1233 } 1234 } 1235 #endif /* defined ALL_STATE */ 1236 if (*name == '\0') { 1237 /* 1238 ** User wants it fast rather than right. 1239 */ 1240 lclptr->leapcnt = 0; /* so, we're off a little */ 1241 lclptr->timecnt = 0; 1242 lclptr->typecnt = 0; 1243 lclptr->ttis[0].tt_isdst = 0; 1244 lclptr->ttis[0].tt_gmtoff = 0; 1245 lclptr->ttis[0].tt_abbrind = 0; 1246 (void) strcpy(lclptr->chars, gmt); 1247 } else if (tzload(name, lclptr, TRUE) != 0) 1248 if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0) 1249 (void) gmtload(lclptr); 1250 settzname(); 1251 } 1252 1253 void 1254 tzset(void) 1255 { 1256 _tzLock(); 1257 tzset_locked(); 1258 _tzUnlock(); 1259 } 1260 1261 /* 1262 ** The easy way to behave "as if no library function calls" localtime 1263 ** is to not call it--so we drop its guts into "localsub", which can be 1264 ** freely called. (And no, the PANS doesn't require the above behavior-- 1265 ** but it *is* desirable.) 1266 ** 1267 ** The unused offset argument is for the benefit of mktime variants. 1268 */ 1269 1270 /*ARGSUSED*/ 1271 static struct tm * 1272 localsub(const time_t * const timep, const int_fast32_t offset, 1273 struct tm * const tmp, const struct state * sp) // android-changed: added sp. 1274 { 1275 register const struct ttinfo * ttisp; 1276 register int i; 1277 register struct tm * result; 1278 const time_t t = *timep; 1279 1280 // BEGIN android-changed: support user-supplied sp. 1281 if (sp == NULL) { 1282 sp = lclptr; 1283 } 1284 // END android-changed 1285 #ifdef ALL_STATE 1286 if (sp == NULL) 1287 return gmtsub(timep, offset, tmp, sp); // android-changed: added sp. 1288 #endif /* defined ALL_STATE */ 1289 if ((sp->goback && t < sp->ats[0]) || 1290 (sp->goahead && t > sp->ats[sp->timecnt - 1])) { 1291 time_t newt = t; 1292 register time_t seconds; 1293 register time_t tcycles; 1294 register int_fast64_t icycles; 1295 1296 if (t < sp->ats[0]) 1297 seconds = sp->ats[0] - t; 1298 else seconds = t - sp->ats[sp->timecnt - 1]; 1299 --seconds; 1300 tcycles = seconds / YEARSPERREPEAT / AVGSECSPERYEAR; 1301 ++tcycles; 1302 icycles = tcycles; 1303 if (tcycles - icycles >= 1 || icycles - tcycles >= 1) 1304 return NULL; 1305 seconds = icycles; 1306 seconds *= YEARSPERREPEAT; 1307 seconds *= AVGSECSPERYEAR; 1308 if (t < sp->ats[0]) 1309 newt += seconds; 1310 else newt -= seconds; 1311 if (newt < sp->ats[0] || 1312 newt > sp->ats[sp->timecnt - 1]) 1313 return NULL; /* "cannot happen" */ 1314 result = localsub(&newt, offset, tmp, sp); // android-changed: added sp. 1315 if (result == tmp) { 1316 register time_t newy; 1317 1318 newy = tmp->tm_year; 1319 if (t < sp->ats[0]) 1320 newy -= icycles * YEARSPERREPEAT; 1321 else newy += icycles * YEARSPERREPEAT; 1322 tmp->tm_year = newy; 1323 if (tmp->tm_year != newy) 1324 return NULL; 1325 } 1326 return result; 1327 } 1328 if (sp->timecnt == 0 || t < sp->ats[0]) { 1329 i = sp->defaulttype; 1330 } else { 1331 register int lo = 1; 1332 register int hi = sp->timecnt; 1333 1334 while (lo < hi) { 1335 register int mid = (lo + hi) >> 1; 1336 1337 if (t < sp->ats[mid]) 1338 hi = mid; 1339 else lo = mid + 1; 1340 } 1341 i = (int) sp->types[lo - 1]; 1342 } 1343 ttisp = &sp->ttis[i]; 1344 /* 1345 ** To get (wrong) behavior that's compatible with System V Release 2.0 1346 ** you'd replace the statement below with 1347 ** t += ttisp->tt_gmtoff; 1348 ** timesub(&t, 0L, sp, tmp); 1349 */ 1350 result = timesub(&t, ttisp->tt_gmtoff, sp, tmp); 1351 tmp->tm_isdst = ttisp->tt_isdst; 1352 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; 1353 #ifdef TM_ZONE 1354 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; 1355 #endif /* defined TM_ZONE */ 1356 return result; 1357 } 1358 1359 struct tm * 1360 localtime(const time_t * const timep) 1361 { 1362 return localtime_r(timep, &tmGlobal); 1363 } 1364 1365 /* 1366 ** Re-entrant version of localtime. 1367 */ 1368 1369 struct tm * 1370 localtime_r(const time_t * const timep, struct tm * tmp) 1371 { 1372 struct tm* result; 1373 1374 _tzLock(); 1375 tzset_locked(); 1376 result = localsub(timep, 0L, tmp, NULL); // android-changed: extra parameter. 1377 _tzUnlock(); 1378 1379 return result; 1380 } 1381 1382 /* 1383 ** gmtsub is to gmtime as localsub is to localtime. 1384 */ 1385 1386 static struct tm * 1387 gmtsub(const time_t * const timep, const int_fast32_t offset, 1388 struct tm *const tmp, const struct state * sp) // android-changed: added sp. 1389 { 1390 register struct tm * result; 1391 1392 (void) sp; // android-added: unused. 1393 1394 if (!gmt_is_set) { 1395 gmt_is_set = TRUE; 1396 #ifdef ALL_STATE 1397 gmtptr = calloc(1, sizeof *gmtptr); 1398 if (gmtptr != NULL) 1399 #endif /* defined ALL_STATE */ 1400 gmtload(gmtptr); 1401 } 1402 result = timesub(timep, offset, gmtptr, tmp); 1403 #ifdef TM_ZONE 1404 /* 1405 ** Could get fancy here and deliver something such as 1406 ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero, 1407 ** but this is no time for a treasure hunt. 1408 */ 1409 if (offset != 0) 1410 tmp->TM_ZONE = wildabbr; 1411 else { 1412 #ifdef ALL_STATE 1413 if (gmtptr == NULL) 1414 tmp->TM_ZONE = gmt; 1415 else tmp->TM_ZONE = gmtptr->chars; 1416 #endif /* defined ALL_STATE */ 1417 #ifndef ALL_STATE 1418 tmp->TM_ZONE = gmtptr->chars; 1419 #endif /* State Farm */ 1420 } 1421 #endif /* defined TM_ZONE */ 1422 return result; 1423 } 1424 1425 struct tm * 1426 gmtime(const time_t * const timep) 1427 { 1428 return gmtime_r(timep, &tmGlobal); 1429 } 1430 1431 /* 1432 * Re-entrant version of gmtime. 1433 */ 1434 1435 struct tm * 1436 gmtime_r(const time_t * const timep, struct tm * tmp) 1437 { 1438 struct tm* result; 1439 1440 _tzLock(); 1441 result = gmtsub(timep, 0L, tmp, NULL); // android-changed: extra parameter. 1442 _tzUnlock(); 1443 1444 return result; 1445 } 1446 1447 /* 1448 ** Return the number of leap years through the end of the given year 1449 ** where, to make the math easy, the answer for year zero is defined as zero. 1450 */ 1451 1452 static int 1453 leaps_thru_end_of(register const int y) 1454 { 1455 return (y >= 0) ? (y / 4 - y / 100 + y / 400) : 1456 -(leaps_thru_end_of(-(y + 1)) + 1); 1457 } 1458 1459 static struct tm * 1460 timesub(const time_t *const timep, const int_fast32_t offset, 1461 register const struct state *const sp, 1462 register struct tm *const tmp) 1463 { 1464 register const struct lsinfo * lp; 1465 register time_t tdays; 1466 register int idays; /* unsigned would be so 2003 */ 1467 register int_fast64_t rem; 1468 int y; 1469 register const int * ip; 1470 register int_fast64_t corr; 1471 register int hit; 1472 register int i; 1473 1474 corr = 0; 1475 hit = 0; 1476 #ifdef ALL_STATE 1477 i = (sp == NULL) ? 0 : sp->leapcnt; 1478 #endif /* defined ALL_STATE */ 1479 #ifndef ALL_STATE 1480 i = sp->leapcnt; 1481 #endif /* State Farm */ 1482 while (--i >= 0) { 1483 lp = &sp->lsis[i]; 1484 if (*timep >= lp->ls_trans) { 1485 if (*timep == lp->ls_trans) { 1486 hit = ((i == 0 && lp->ls_corr > 0) || 1487 lp->ls_corr > sp->lsis[i - 1].ls_corr); 1488 if (hit) 1489 while (i > 0 && 1490 sp->lsis[i].ls_trans == 1491 sp->lsis[i - 1].ls_trans + 1 && 1492 sp->lsis[i].ls_corr == 1493 sp->lsis[i - 1].ls_corr + 1) { 1494 ++hit; 1495 --i; 1496 } 1497 } 1498 corr = lp->ls_corr; 1499 break; 1500 } 1501 } 1502 y = EPOCH_YEAR; 1503 tdays = *timep / SECSPERDAY; 1504 rem = *timep - tdays * SECSPERDAY; 1505 while (tdays < 0 || tdays >= year_lengths[isleap(y)]) { 1506 int newy; 1507 register time_t tdelta; 1508 register int idelta; 1509 register int leapdays; 1510 1511 tdelta = tdays / DAYSPERLYEAR; 1512 idelta = tdelta; 1513 if (tdelta - idelta >= 1 || idelta - tdelta >= 1) 1514 return NULL; 1515 if (idelta == 0) 1516 idelta = (tdays < 0) ? -1 : 1; 1517 newy = y; 1518 if (increment_overflow(&newy, idelta)) 1519 return NULL; 1520 leapdays = leaps_thru_end_of(newy - 1) - 1521 leaps_thru_end_of(y - 1); 1522 tdays -= ((time_t) newy - y) * DAYSPERNYEAR; 1523 tdays -= leapdays; 1524 y = newy; 1525 } 1526 { 1527 register int_fast32_t seconds; 1528 register time_t half_second = 0.5; 1529 1530 seconds = tdays * SECSPERDAY + half_second; 1531 tdays = seconds / SECSPERDAY; 1532 rem += seconds - tdays * SECSPERDAY; 1533 } 1534 /* 1535 ** Given the range, we can now fearlessly cast... 1536 */ 1537 idays = tdays; 1538 rem += offset - corr; 1539 while (rem < 0) { 1540 rem += SECSPERDAY; 1541 --idays; 1542 } 1543 while (rem >= SECSPERDAY) { 1544 rem -= SECSPERDAY; 1545 ++idays; 1546 } 1547 while (idays < 0) { 1548 if (increment_overflow(&y, -1)) 1549 return NULL; 1550 idays += year_lengths[isleap(y)]; 1551 } 1552 while (idays >= year_lengths[isleap(y)]) { 1553 idays -= year_lengths[isleap(y)]; 1554 if (increment_overflow(&y, 1)) 1555 return NULL; 1556 } 1557 tmp->tm_year = y; 1558 if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE)) 1559 return NULL; 1560 tmp->tm_yday = idays; 1561 /* 1562 ** The "extra" mods below avoid overflow problems. 1563 */ 1564 tmp->tm_wday = EPOCH_WDAY + 1565 ((y - EPOCH_YEAR) % DAYSPERWEEK) * 1566 (DAYSPERNYEAR % DAYSPERWEEK) + 1567 leaps_thru_end_of(y - 1) - 1568 leaps_thru_end_of(EPOCH_YEAR - 1) + 1569 idays; 1570 tmp->tm_wday %= DAYSPERWEEK; 1571 if (tmp->tm_wday < 0) 1572 tmp->tm_wday += DAYSPERWEEK; 1573 tmp->tm_hour = (int) (rem / SECSPERHOUR); 1574 rem %= SECSPERHOUR; 1575 tmp->tm_min = (int) (rem / SECSPERMIN); 1576 /* 1577 ** A positive leap second requires a special 1578 ** representation. This uses "... ??:59:60" et seq. 1579 */ 1580 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; 1581 ip = mon_lengths[isleap(y)]; 1582 for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon)) 1583 idays -= ip[tmp->tm_mon]; 1584 tmp->tm_mday = (int) (idays + 1); 1585 tmp->tm_isdst = 0; 1586 #ifdef TM_GMTOFF 1587 tmp->TM_GMTOFF = offset; 1588 #endif /* defined TM_GMTOFF */ 1589 return tmp; 1590 } 1591 1592 char * 1593 ctime(const time_t * const timep) 1594 { 1595 /* 1596 ** Section 4.12.3.2 of X3.159-1989 requires that 1597 ** The ctime function converts the calendar time pointed to by timer 1598 ** to local time in the form of a string. It is equivalent to 1599 ** asctime(localtime(timer)) 1600 */ 1601 return asctime(localtime(timep)); 1602 } 1603 1604 char * 1605 ctime_r(const time_t * const timep, char * buf) 1606 { 1607 struct tm mytm; 1608 1609 return asctime_r(localtime_r(timep, &mytm), buf); 1610 } 1611 1612 /* 1613 ** Adapted from code provided by Robert Elz, who writes: 1614 ** The "best" way to do mktime I think is based on an idea of Bob 1615 ** Kridle's (so its said...) from a long time ago. 1616 ** It does a binary search of the time_t space. Since time_t's are 1617 ** just 32 bits, its a max of 32 iterations (even at 64 bits it 1618 ** would still be very reasonable). 1619 */ 1620 1621 #ifndef WRONG 1622 #define WRONG (-1) 1623 #endif /* !defined WRONG */ 1624 1625 /* 1626 ** Normalize logic courtesy Paul Eggert. 1627 */ 1628 1629 static int 1630 increment_overflow(int *const ip, int j) 1631 { 1632 register int const i = *ip; 1633 1634 /* 1635 ** If i >= 0 there can only be overflow if i + j > INT_MAX 1636 ** or if j > INT_MAX - i; given i >= 0, INT_MAX - i cannot overflow. 1637 ** If i < 0 there can only be overflow if i + j < INT_MIN 1638 ** or if j < INT_MIN - i; given i < 0, INT_MIN - i cannot overflow. 1639 */ 1640 if ((i >= 0) ? (j > INT_MAX - i) : (j < INT_MIN - i)) 1641 return TRUE; 1642 *ip += j; 1643 return FALSE; 1644 } 1645 1646 static int 1647 increment_overflow32(int_fast32_t *const lp, int const m) 1648 { 1649 register int_fast32_t const l = *lp; 1650 1651 if ((l >= 0) ? (m > INT_FAST32_MAX - l) : (m < INT_FAST32_MIN - l)) 1652 return TRUE; 1653 *lp += m; 1654 return FALSE; 1655 } 1656 1657 static int 1658 normalize_overflow(int *const tensptr, int *const unitsptr, const int base) 1659 { 1660 register int tensdelta; 1661 1662 tensdelta = (*unitsptr >= 0) ? 1663 (*unitsptr / base) : 1664 (-1 - (-1 - *unitsptr) / base); 1665 *unitsptr -= tensdelta * base; 1666 return increment_overflow(tensptr, tensdelta); 1667 } 1668 1669 static int 1670 normalize_overflow32(int_fast32_t *const tensptr, int *const unitsptr, 1671 const int base) 1672 { 1673 register int tensdelta; 1674 1675 tensdelta = (*unitsptr >= 0) ? 1676 (*unitsptr / base) : 1677 (-1 - (-1 - *unitsptr) / base); 1678 *unitsptr -= tensdelta * base; 1679 return increment_overflow32(tensptr, tensdelta); 1680 } 1681 1682 static int 1683 tmcomp(register const struct tm * const atmp, 1684 register const struct tm * const btmp) 1685 { 1686 register int result; 1687 1688 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && 1689 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && 1690 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && 1691 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && 1692 (result = (atmp->tm_min - btmp->tm_min)) == 0) 1693 result = atmp->tm_sec - btmp->tm_sec; 1694 return result; 1695 } 1696 1697 static time_t 1698 time2sub(struct tm * const tmp, 1699 struct tm *(*const funcp)(const time_t*, int_fast32_t, struct tm*, const struct state*), 1700 const int_fast32_t offset, 1701 int * const okayp, 1702 const int do_norm_secs, const struct state * sp) // android-changed: added sp 1703 { 1704 register int dir; 1705 register int i, j; 1706 register int saved_seconds; 1707 register int_fast32_t li; 1708 register time_t lo; 1709 register time_t hi; 1710 int_fast32_t y; 1711 time_t newt; 1712 time_t t; 1713 struct tm yourtm, mytm; 1714 1715 *okayp = FALSE; 1716 yourtm = *tmp; 1717 if (do_norm_secs) { 1718 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec, 1719 SECSPERMIN)) 1720 return WRONG; 1721 } 1722 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) 1723 return WRONG; 1724 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) 1725 return WRONG; 1726 y = yourtm.tm_year; 1727 if (normalize_overflow32(&y, &yourtm.tm_mon, MONSPERYEAR)) 1728 return WRONG; 1729 /* 1730 ** Turn y into an actual year number for now. 1731 ** It is converted back to an offset from TM_YEAR_BASE later. 1732 */ 1733 if (increment_overflow32(&y, TM_YEAR_BASE)) 1734 return WRONG; 1735 while (yourtm.tm_mday <= 0) { 1736 if (increment_overflow32(&y, -1)) 1737 return WRONG; 1738 li = y + (1 < yourtm.tm_mon); 1739 yourtm.tm_mday += year_lengths[isleap(li)]; 1740 } 1741 while (yourtm.tm_mday > DAYSPERLYEAR) { 1742 li = y + (1 < yourtm.tm_mon); 1743 yourtm.tm_mday -= year_lengths[isleap(li)]; 1744 if (increment_overflow32(&y, 1)) 1745 return WRONG; 1746 } 1747 for ( ; ; ) { 1748 i = mon_lengths[isleap(y)][yourtm.tm_mon]; 1749 if (yourtm.tm_mday <= i) 1750 break; 1751 yourtm.tm_mday -= i; 1752 if (++yourtm.tm_mon >= MONSPERYEAR) { 1753 yourtm.tm_mon = 0; 1754 if (increment_overflow32(&y, 1)) 1755 return WRONG; 1756 } 1757 } 1758 if (increment_overflow32(&y, -TM_YEAR_BASE)) 1759 return WRONG; 1760 yourtm.tm_year = y; 1761 if (yourtm.tm_year != y) 1762 return WRONG; 1763 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN) 1764 saved_seconds = 0; 1765 else if (y + TM_YEAR_BASE < EPOCH_YEAR) { 1766 /* 1767 ** We can't set tm_sec to 0, because that might push the 1768 ** time below the minimum representable time. 1769 ** Set tm_sec to 59 instead. 1770 ** This assumes that the minimum representable time is 1771 ** not in the same minute that a leap second was deleted from, 1772 ** which is a safer assumption than using 58 would be. 1773 */ 1774 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) 1775 return WRONG; 1776 saved_seconds = yourtm.tm_sec; 1777 yourtm.tm_sec = SECSPERMIN - 1; 1778 } else { 1779 saved_seconds = yourtm.tm_sec; 1780 yourtm.tm_sec = 0; 1781 } 1782 /* 1783 ** Do a binary search (this works whatever time_t's type is). 1784 */ 1785 if (!TYPE_SIGNED(time_t)) { 1786 lo = 0; 1787 hi = lo - 1; 1788 } else if (!TYPE_INTEGRAL(time_t)) { 1789 if (sizeof(time_t) > sizeof(float)) 1790 hi = (time_t) DBL_MAX; 1791 else hi = (time_t) FLT_MAX; 1792 lo = -hi; 1793 } else { 1794 lo = 1; 1795 for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i) 1796 lo *= 2; 1797 hi = -(lo + 1); 1798 } 1799 for ( ; ; ) { 1800 t = lo / 2 + hi / 2; 1801 if (t < lo) 1802 t = lo; 1803 else if (t > hi) 1804 t = hi; 1805 if ((*funcp)(&t, offset, &mytm, sp) == NULL) { // android-changed: added sp. 1806 /* 1807 ** Assume that t is too extreme to be represented in 1808 ** a struct tm; arrange things so that it is less 1809 ** extreme on the next pass. 1810 */ 1811 dir = (t > 0) ? 1 : -1; 1812 } else dir = tmcomp(&mytm, &yourtm); 1813 if (dir != 0) { 1814 if (t == lo) { 1815 if (t == time_t_max) 1816 return WRONG; 1817 ++t; 1818 ++lo; 1819 } else if (t == hi) { 1820 if (t == time_t_min) 1821 return WRONG; 1822 --t; 1823 --hi; 1824 } 1825 if (lo > hi) 1826 return WRONG; 1827 if (dir > 0) 1828 hi = t; 1829 else lo = t; 1830 continue; 1831 } 1832 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) 1833 break; 1834 /* 1835 ** Right time, wrong type. 1836 ** Hunt for right time, right type. 1837 ** It's okay to guess wrong since the guess 1838 ** gets checked. 1839 */ 1840 // BEGIN android-changed: support user-supplied sp 1841 if (sp == NULL) { 1842 sp = (const struct state *) 1843 ((funcp == localsub) ? lclptr : gmtptr); 1844 } 1845 // END android-changed 1846 #ifdef ALL_STATE 1847 if (sp == NULL) 1848 return WRONG; 1849 #endif /* defined ALL_STATE */ 1850 for (i = sp->typecnt - 1; i >= 0; --i) { 1851 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) 1852 continue; 1853 for (j = sp->typecnt - 1; j >= 0; --j) { 1854 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) 1855 continue; 1856 newt = t + sp->ttis[j].tt_gmtoff - 1857 sp->ttis[i].tt_gmtoff; 1858 if ((*funcp)(&newt, offset, &mytm, sp) == NULL) // android-changed: added sp. 1859 continue; 1860 if (tmcomp(&mytm, &yourtm) != 0) 1861 continue; 1862 if (mytm.tm_isdst != yourtm.tm_isdst) 1863 continue; 1864 /* 1865 ** We have a match. 1866 */ 1867 t = newt; 1868 goto label; 1869 } 1870 } 1871 return WRONG; 1872 } 1873 label: 1874 newt = t + saved_seconds; 1875 if ((newt < t) != (saved_seconds < 0)) 1876 return WRONG; 1877 t = newt; 1878 if ((*funcp)(&t, offset, tmp, sp)) // android-changed: added sp. 1879 *okayp = TRUE; 1880 return t; 1881 } 1882 1883 static time_t 1884 time2(struct tm * const tmp, 1885 struct tm * (*const funcp)(const time_t *, int_fast32_t, struct tm *, const struct state *), // android-changed: added sp. 1886 const int_fast32_t offset, 1887 int *const okayp, const struct state* sp) // android-changed: added sp. 1888 { 1889 time_t t; 1890 1891 /* 1892 ** First try without normalization of seconds 1893 ** (in case tm_sec contains a value associated with a leap second). 1894 ** If that fails, try with normalization of seconds. 1895 */ 1896 t = time2sub(tmp, funcp, offset, okayp, FALSE, sp); 1897 return *okayp ? t : time2sub(tmp, funcp, offset, okayp, TRUE, sp); 1898 } 1899 1900 static time_t 1901 time1(struct tm * const tmp, 1902 struct tm * (* const funcp) (const time_t *, int_fast32_t, struct tm *, const struct state *), // android-changed: added sp. 1903 const int_fast32_t offset, const struct state * sp) // android-changed: added sp. 1904 { 1905 register time_t t; 1906 register int samei, otheri; 1907 register int sameind, otherind; 1908 register int i; 1909 register int nseen; 1910 int seen[TZ_MAX_TYPES]; 1911 int types[TZ_MAX_TYPES]; 1912 int okay; 1913 1914 if (tmp == NULL) { 1915 errno = EINVAL; 1916 return WRONG; 1917 } 1918 if (tmp->tm_isdst > 1) 1919 tmp->tm_isdst = 1; 1920 t = time2(tmp, funcp, offset, &okay, sp); // android-changed: added sp. 1921 #ifdef PCTS 1922 /* 1923 ** PCTS code courtesy Grant Sullivan. 1924 */ 1925 if (okay) 1926 return t; 1927 if (tmp->tm_isdst < 0) 1928 tmp->tm_isdst = 0; /* reset to std and try again */ 1929 #endif /* defined PCTS */ 1930 #ifndef PCTS 1931 if (okay || tmp->tm_isdst < 0) 1932 return t; 1933 #endif /* !defined PCTS */ 1934 /* 1935 ** We're supposed to assume that somebody took a time of one type 1936 ** and did some math on it that yielded a "struct tm" that's bad. 1937 ** We try to divine the type they started from and adjust to the 1938 ** type they need. 1939 */ 1940 // BEGIN android-changed: support user-supplied sp. 1941 if (sp == NULL) { 1942 sp = (const struct state *) ((funcp == localsub) ? lclptr : gmtptr); 1943 } 1944 // BEGIN android-changed 1945 #ifdef ALL_STATE 1946 if (sp == NULL) 1947 return WRONG; 1948 #endif /* defined ALL_STATE */ 1949 for (i = 0; i < sp->typecnt; ++i) 1950 seen[i] = FALSE; 1951 nseen = 0; 1952 for (i = sp->timecnt - 1; i >= 0; --i) 1953 if (!seen[sp->types[i]]) { 1954 seen[sp->types[i]] = TRUE; 1955 types[nseen++] = sp->types[i]; 1956 } 1957 for (sameind = 0; sameind < nseen; ++sameind) { 1958 samei = types[sameind]; 1959 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) 1960 continue; 1961 for (otherind = 0; otherind < nseen; ++otherind) { 1962 otheri = types[otherind]; 1963 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) 1964 continue; 1965 tmp->tm_sec += sp->ttis[otheri].tt_gmtoff - 1966 sp->ttis[samei].tt_gmtoff; 1967 tmp->tm_isdst = !tmp->tm_isdst; 1968 t = time2(tmp, funcp, offset, &okay, sp); // android-changed: added sp. 1969 if (okay) 1970 return t; 1971 tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff - 1972 sp->ttis[samei].tt_gmtoff; 1973 tmp->tm_isdst = !tmp->tm_isdst; 1974 } 1975 } 1976 return WRONG; 1977 } 1978 1979 time_t 1980 mktime(struct tm * const tmp) 1981 { 1982 _tzLock(); 1983 tzset_locked(); 1984 time_t result = time1(tmp, localsub, 0L, NULL); // android-changed: extra parameter. 1985 _tzUnlock(); 1986 return result; 1987 } 1988 1989 #ifdef STD_INSPIRED 1990 1991 time_t 1992 timelocal(struct tm * const tmp) 1993 { 1994 if (tmp != NULL) 1995 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 1996 return mktime(tmp); 1997 } 1998 1999 time_t 2000 timegm(struct tm * const tmp) 2001 { 2002 time_t result; 2003 2004 if (tmp != NULL) 2005 tmp->tm_isdst = 0; 2006 _tzLock(); 2007 result = time1(tmp, gmtsub, 0L, NULL); // android-changed: extra parameter. 2008 _tzUnlock(); 2009 2010 return result; 2011 } 2012 2013 #endif /* defined STD_INSPIRED */ 2014 2015 #ifdef CMUCS 2016 2017 /* 2018 ** The following is supplied for compatibility with 2019 ** previous versions of the CMUCS runtime library. 2020 */ 2021 2022 int_fast32_t 2023 gtime(struct tm * const tmp) 2024 { 2025 const time_t t = mktime(tmp); 2026 2027 if (t == WRONG) 2028 return -1; 2029 return t; 2030 } 2031 2032 #endif /* defined CMUCS */ 2033 2034 /* 2035 ** XXX--is the below the right way to conditionalize?? 2036 */ 2037 2038 #ifdef STD_INSPIRED 2039 2040 /* 2041 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 2042 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which 2043 ** is not the case if we are accounting for leap seconds. 2044 ** So, we provide the following conversion routines for use 2045 ** when exchanging timestamps with POSIX conforming systems. 2046 */ 2047 2048 static int_fast64_t 2049 leapcorr(time_t * timep) 2050 { 2051 register struct state * sp; 2052 register struct lsinfo * lp; 2053 register int i; 2054 2055 sp = lclptr; 2056 i = sp->leapcnt; 2057 while (--i >= 0) { 2058 lp = &sp->lsis[i]; 2059 if (*timep >= lp->ls_trans) 2060 return lp->ls_corr; 2061 } 2062 return 0; 2063 } 2064 2065 time_t 2066 time2posix(time_t t) 2067 { 2068 tzset(); 2069 return t - leapcorr(&t); 2070 } 2071 2072 time_t 2073 posix2time(time_t t) 2074 { 2075 time_t x; 2076 time_t y; 2077 2078 tzset(); 2079 /* 2080 ** For a positive leap second hit, the result 2081 ** is not unique. For a negative leap second 2082 ** hit, the corresponding time doesn't exist, 2083 ** so we return an adjacent second. 2084 */ 2085 x = t + leapcorr(&t); 2086 y = x - leapcorr(&x); 2087 if (y < t) { 2088 do { 2089 x++; 2090 y = x - leapcorr(&x); 2091 } while (y < t); 2092 if (t != y) 2093 return x - 1; 2094 } else if (y > t) { 2095 do { 2096 --x; 2097 y = x - leapcorr(&x); 2098 } while (y > t); 2099 if (t != y) 2100 return x + 1; 2101 } 2102 return x; 2103 } 2104 2105 #endif /* defined STD_INSPIRED */ 2106 2107 // BEGIN android-added 2108 2109 #include <assert.h> 2110 #include <stdint.h> 2111 #include <arpa/inet.h> // For ntohl(3). 2112 2113 static int to_int(unsigned char* s) { 2114 return (s[0] << 24) | (s[1] << 16) | (s[2] << 8) | s[3]; 2115 } 2116 2117 static int __bionic_open_tzdata_path(const char* path, const char* olson_id, int* data_size) { 2118 int fd = TEMP_FAILURE_RETRY(open(path, OPEN_MODE)); 2119 if (fd == -1) { 2120 XLOG(("%s: could not open \"%s\": %s\n", __FUNCTION__, path, strerror(errno))); 2121 return -2; // Distinguish failure to find any data from failure to find a specific id. 2122 } 2123 2124 // byte[12] tzdata_version -- "tzdata2012f\0" 2125 // int index_offset 2126 // int data_offset 2127 // int zonetab_offset 2128 struct bionic_tzdata_header { 2129 char tzdata_version[12]; 2130 int32_t index_offset; 2131 int32_t data_offset; 2132 int32_t zonetab_offset; 2133 } header; 2134 memset(&header, 0, sizeof(header)); 2135 ssize_t bytes_read = TEMP_FAILURE_RETRY(read(fd, &header, sizeof(header))); 2136 if (bytes_read != sizeof(header)) { 2137 fprintf(stderr, "%s: could not read header of \"%s\": %s\n", 2138 __FUNCTION__, path, (bytes_read == -1) ? strerror(errno) : "short read"); 2139 close(fd); 2140 return -1; 2141 } 2142 2143 if (strncmp(header.tzdata_version, "tzdata", 6) != 0 || header.tzdata_version[11] != 0) { 2144 fprintf(stderr, "%s: bad magic in \"%s\": \"%.6s\"\n", 2145 __FUNCTION__, path, header.tzdata_version); 2146 close(fd); 2147 return -1; 2148 } 2149 2150 #if 0 2151 fprintf(stderr, "version: %s\n", header.tzdata_version); 2152 fprintf(stderr, "index_offset = %d\n", ntohl(header.index_offset)); 2153 fprintf(stderr, "data_offset = %d\n", ntohl(header.data_offset)); 2154 fprintf(stderr, "zonetab_offset = %d\n", ntohl(header.zonetab_offset)); 2155 #endif 2156 2157 if (TEMP_FAILURE_RETRY(lseek(fd, ntohl(header.index_offset), SEEK_SET)) == -1) { 2158 fprintf(stderr, "%s: couldn't seek to index in \"%s\": %s\n", 2159 __FUNCTION__, path, strerror(errno)); 2160 close(fd); 2161 return -1; 2162 } 2163 2164 off_t specific_zone_offset = -1; 2165 2166 static const size_t NAME_LENGTH = 40; 2167 unsigned char buf[NAME_LENGTH + 3 * sizeof(int32_t)]; 2168 2169 size_t id_count = (ntohl(header.data_offset) - ntohl(header.index_offset)) / sizeof(buf); 2170 for (size_t i = 0; i < id_count; ++i) { 2171 if (TEMP_FAILURE_RETRY(read(fd, buf, sizeof(buf))) != (ssize_t) sizeof(buf)) { 2172 break; 2173 } 2174 2175 char this_id[NAME_LENGTH + 1]; 2176 memcpy(this_id, buf, NAME_LENGTH); 2177 this_id[NAME_LENGTH] = '\0'; 2178 2179 if (strcmp(this_id, olson_id) == 0) { 2180 specific_zone_offset = to_int(buf + NAME_LENGTH) + ntohl(header.data_offset); 2181 *data_size = to_int(buf + NAME_LENGTH + sizeof(int32_t)); 2182 break; 2183 } 2184 } 2185 2186 if (specific_zone_offset == -1) { 2187 XLOG(("%s: couldn't find zone \"%s\"\n", __FUNCTION__, olson_id)); 2188 close(fd); 2189 return -1; 2190 } 2191 2192 if (TEMP_FAILURE_RETRY(lseek(fd, specific_zone_offset, SEEK_SET)) == -1) { 2193 fprintf(stderr, "%s: could not seek to %ld in \"%s\": %s\n", 2194 __FUNCTION__, specific_zone_offset, path, strerror(errno)); 2195 close(fd); 2196 return -1; 2197 } 2198 2199 // TODO: check that there's TZ_MAGIC at this offset, so we can fall back to the other file if not. 2200 2201 return fd; 2202 } 2203 2204 static int __bionic_open_tzdata(const char* olson_id, int* data_size) { 2205 // TODO: use $ANDROID_DATA and $ANDROID_ROOT like libcore, to support bionic on the host. 2206 int fd = __bionic_open_tzdata_path("/data/misc/zoneinfo/tzdata", olson_id, data_size); 2207 if (fd < 0) { 2208 fd = __bionic_open_tzdata_path("/system/usr/share/zoneinfo/tzdata", olson_id, data_size); 2209 if (fd == -2) { 2210 // The first thing that 'recovery' does is try to format the current time. It doesn't have 2211 // any tzdata available, so we must not abort here --- doing so breaks the recovery image! 2212 fprintf(stderr, "%s: couldn't find any tzdata when looking for %s!\n", __FUNCTION__, olson_id); 2213 } 2214 } 2215 return fd; 2216 } 2217 2218 // Caches the most recent timezone (http://b/8270865). 2219 static int __bionic_tzload_cached(const char* name, struct state* const sp, const int doextend) { 2220 _tzLock(); 2221 2222 // Our single-item cache. 2223 static char* gCachedTimeZoneName; 2224 static struct state gCachedTimeZone; 2225 2226 // Do we already have this timezone cached? 2227 if (gCachedTimeZoneName != NULL && strcmp(name, gCachedTimeZoneName) == 0) { 2228 *sp = gCachedTimeZone; 2229 _tzUnlock(); 2230 return 0; 2231 } 2232 2233 // Can we load it? 2234 int rc = tzload(name, sp, doextend); 2235 if (rc == 0) { 2236 // Update the cache. 2237 free(gCachedTimeZoneName); 2238 gCachedTimeZoneName = strdup(name); 2239 gCachedTimeZone = *sp; 2240 } 2241 2242 _tzUnlock(); 2243 return rc; 2244 } 2245 2246 // Non-standard API: mktime(3) but with an explicit timezone parameter. 2247 time_t mktime_tz(struct tm* const tmp, const char* tz) { 2248 struct state st; 2249 if (__bionic_tzload_cached(tz, &st, TRUE) != 0) { 2250 // TODO: not sure what's best here, but for now, we fall back to gmt. 2251 gmtload(&st); 2252 } 2253 return time1(tmp, localsub, 0L, &st); 2254 } 2255 2256 // Non-standard API: localtime(3) but with an explicit timezone parameter. 2257 void localtime_tz(const time_t* const timep, struct tm* tmp, const char* tz) { 2258 struct state st; 2259 if (__bionic_tzload_cached(tz, &st, TRUE) != 0) { 2260 // TODO: not sure what's best here, but for now, we fall back to gmt. 2261 gmtload(&st); 2262 } 2263 localsub(timep, 0L, tmp, &st); 2264 } 2265 2266 // END android-added 2267
