1 /* 2 ** This file is in the public domain, so clarified as of 3 ** 1996-06-05 by Arthur David Olson. 4 */ 5 6 #ifndef lint 7 #ifndef NOID 8 static char elsieid[] = "@(#)localtime.c 8.3"; 9 #endif /* !defined NOID */ 10 #endif /* !defined lint */ 11 12 /* 13 ** Leap second handling from Bradley White. 14 ** POSIX-style TZ environment variable handling from Guy Harris. 15 */ 16 17 /*LINTLIBRARY*/ 18 19 #include "private.h" 20 #include "tzfile.h" 21 #include "fcntl.h" 22 #include "float.h" /* for FLT_MAX and DBL_MAX */ 23 24 #include "thread_private.h" 25 #include <sys/system_properties.h> 26 27 #ifndef TZ_ABBR_MAX_LEN 28 #define TZ_ABBR_MAX_LEN 16 29 #endif /* !defined TZ_ABBR_MAX_LEN */ 30 31 #ifndef TZ_ABBR_CHAR_SET 32 #define TZ_ABBR_CHAR_SET \ 33 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._" 34 #endif /* !defined TZ_ABBR_CHAR_SET */ 35 36 #ifndef TZ_ABBR_ERR_CHAR 37 #define TZ_ABBR_ERR_CHAR '_' 38 #endif /* !defined TZ_ABBR_ERR_CHAR */ 39 40 /* 41 ** SunOS 4.1.1 headers lack O_BINARY. 42 */ 43 44 #ifdef O_BINARY 45 #define OPEN_MODE (O_RDONLY | O_BINARY) 46 #endif /* defined O_BINARY */ 47 #ifndef O_BINARY 48 #define OPEN_MODE O_RDONLY 49 #endif /* !defined O_BINARY */ 50 51 #if 0 52 # define XLOG(xx) printf xx , fflush(stdout) 53 #else 54 # define XLOG(x) do{}while (0) 55 #endif 56 57 /* Add the following function implementations: 58 * timelocal() 59 * timegm() 60 * time2posix() 61 * posix2time() 62 */ 63 #define STD_INSPIRED 1 64 65 /* THREAD-SAFETY SUPPORT GOES HERE */ 66 static pthread_mutex_t _tzMutex = PTHREAD_MUTEX_INITIALIZER; 67 68 static __inline__ void _tzLock(void) 69 { 70 if (__isthreaded) 71 pthread_mutex_lock(&_tzMutex); 72 } 73 74 static __inline__ void _tzUnlock(void) 75 { 76 if (__isthreaded) 77 pthread_mutex_unlock(&_tzMutex); 78 } 79 80 /* Complex computations to determine the min/max of time_t depending 81 * on TYPE_BIT / TYPE_SIGNED / TYPE_INTEGRAL. 82 * These macros cannot be used in pre-processor directives, so we 83 * let the C compiler do the work, which makes things a bit funky. 84 */ 85 static const time_t TIME_T_MAX = 86 TYPE_INTEGRAL(time_t) ? 87 ( TYPE_SIGNED(time_t) ? 88 ~((time_t)1 << (TYPE_BIT(time_t)-1)) 89 : 90 ~(time_t)0 91 ) 92 : /* if time_t is a floating point number */ 93 ( sizeof(time_t) > sizeof(float) ? (time_t)DBL_MAX : (time_t)FLT_MAX ); 94 95 static const time_t TIME_T_MIN = 96 TYPE_INTEGRAL(time_t) ? 97 ( TYPE_SIGNED(time_t) ? 98 ((time_t)1 << (TYPE_BIT(time_t)-1)) 99 : 100 0 101 ) 102 : 103 ( sizeof(time_t) > sizeof(float) ? (time_t)DBL_MIN : (time_t)FLT_MIN ); 104 105 #ifndef WILDABBR 106 /* 107 ** Someone might make incorrect use of a time zone abbreviation: 108 ** 1. They might reference tzname[0] before calling tzset (explicitly 109 ** or implicitly). 110 ** 2. They might reference tzname[1] before calling tzset (explicitly 111 ** or implicitly). 112 ** 3. They might reference tzname[1] after setting to a time zone 113 ** in which Daylight Saving Time is never observed. 114 ** 4. They might reference tzname[0] after setting to a time zone 115 ** in which Standard Time is never observed. 116 ** 5. They might reference tm.TM_ZONE after calling offtime. 117 ** What's best to do in the above cases is open to debate; 118 ** for now, we just set things up so that in any of the five cases 119 ** WILDABBR is used. Another possibility: initialize tzname[0] to the 120 ** string "tzname[0] used before set", and similarly for the other cases. 121 ** And another: initialize tzname[0] to "ERA", with an explanation in the 122 ** manual page of what this "time zone abbreviation" means (doing this so 123 ** that tzname[0] has the "normal" length of three characters). 124 */ 125 #define WILDABBR " " 126 #endif /* !defined WILDABBR */ 127 128 static char wildabbr[] = WILDABBR; 129 130 static const char gmt[] = "GMT"; 131 132 /* 133 ** The DST rules to use if TZ has no rules and we can't load TZDEFRULES. 134 ** We default to US rules as of 1999-08-17. 135 ** POSIX 1003.1 section 8.1.1 says that the default DST rules are 136 ** implementation dependent; for historical reasons, US rules are a 137 ** common default. 138 */ 139 #ifndef TZDEFRULESTRING 140 #define TZDEFRULESTRING ",M4.1.0,M10.5.0" 141 #endif /* !defined TZDEFDST */ 142 143 struct ttinfo { /* time type information */ 144 long tt_gmtoff; /* UTC offset in seconds */ 145 int tt_isdst; /* used to set tm_isdst */ 146 int tt_abbrind; /* abbreviation list index */ 147 int tt_ttisstd; /* TRUE if transition is std time */ 148 int tt_ttisgmt; /* TRUE if transition is UTC */ 149 }; 150 151 struct lsinfo { /* leap second information */ 152 time_t ls_trans; /* transition time */ 153 long ls_corr; /* correction to apply */ 154 }; 155 156 #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) 157 158 #ifdef TZNAME_MAX 159 #define MY_TZNAME_MAX TZNAME_MAX 160 #endif /* defined TZNAME_MAX */ 161 #ifndef TZNAME_MAX 162 #define MY_TZNAME_MAX 255 163 #endif /* !defined TZNAME_MAX */ 164 165 /* XXX: This code should really use time64_t instead of time_t 166 * but we can't change it without re-generating the index 167 * file first with the correct data. 168 */ 169 struct state { 170 int leapcnt; 171 int timecnt; 172 int typecnt; 173 int charcnt; 174 int goback; 175 int goahead; 176 time_t ats[TZ_MAX_TIMES]; 177 unsigned char types[TZ_MAX_TIMES]; 178 struct ttinfo ttis[TZ_MAX_TYPES]; 179 char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt), 180 (2 * (MY_TZNAME_MAX + 1)))]; 181 struct lsinfo lsis[TZ_MAX_LEAPS]; 182 }; 183 184 struct rule { 185 int r_type; /* type of rule--see below */ 186 int r_day; /* day number of rule */ 187 int r_week; /* week number of rule */ 188 int r_mon; /* month number of rule */ 189 long r_time; /* transition time of rule */ 190 }; 191 192 #define JULIAN_DAY 0 /* Jn - Julian day */ 193 #define DAY_OF_YEAR 1 /* n - day of year */ 194 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */ 195 196 /* 197 ** Prototypes for static functions. 198 */ 199 200 /* NOTE: all internal functions assume that _tzLock() was already called */ 201 202 static int __bionic_open_tzdata(const char*, int*); 203 static long detzcode P((const char * codep)); 204 static time_t detzcode64 P((const char * codep)); 205 static int differ_by_repeat P((time_t t1, time_t t0)); 206 static const char * getzname P((const char * strp)); 207 static const char * getqzname P((const char * strp, const int delim)); 208 static const char * getnum P((const char * strp, int * nump, int min, 209 int max)); 210 static const char * getsecs P((const char * strp, long * secsp)); 211 static const char * getoffset P((const char * strp, long * offsetp)); 212 static const char * getrule P((const char * strp, struct rule * rulep)); 213 static void gmtload P((struct state * sp)); 214 static struct tm * gmtsub P((const time_t * timep, long offset, 215 struct tm * tmp, const struct state * sp)); // android-changed: added sp. 216 static struct tm * localsub P((const time_t * timep, long offset, 217 struct tm * tmp, const struct state * sp)); // android-changed: added sp. 218 static int increment_overflow P((int * number, int delta)); 219 static int leaps_thru_end_of P((int y)); 220 static int long_increment_overflow P((long * number, int delta)); 221 static int long_normalize_overflow P((long * tensptr, 222 int * unitsptr, int base)); 223 static int normalize_overflow P((int * tensptr, int * unitsptr, 224 int base)); 225 static void settzname P((void)); 226 static time_t time1 P((struct tm * tmp, 227 struct tm * (*funcp) P((const time_t *, 228 long, struct tm *, const struct state *)), // android-changed: added state*. 229 long offset, const struct state * sp)); // android-changed: added sp. 230 static time_t time2 P((struct tm *tmp, 231 struct tm * (*funcp) P((const time_t *, 232 long, struct tm*, const struct state *)), // android-changed: added state*. 233 long offset, int * okayp, const struct state * sp)); // android-changed: added sp. 234 static time_t time2sub P((struct tm *tmp, 235 struct tm * (*funcp) P((const time_t *, 236 long, struct tm*, const struct state *)), // android-changed: added state*. 237 long offset, int * okayp, int do_norm_secs, const struct state * sp)); // android-change: added sp. 238 static struct tm * timesub P((const time_t * timep, long offset, 239 const struct state * sp, struct tm * tmp)); 240 static int tmcomp P((const struct tm * atmp, 241 const struct tm * btmp)); 242 static time_t transtime P((time_t janfirst, int year, 243 const struct rule * rulep, long offset)); 244 static int tzload P((const char * name, struct state * sp, 245 int doextend)); 246 static int tzparse P((const char * name, struct state * sp, 247 int lastditch)); 248 249 #ifdef ALL_STATE 250 static struct state * lclptr; 251 static struct state * gmtptr; 252 #endif /* defined ALL_STATE */ 253 254 #ifndef ALL_STATE 255 static struct state lclmem; 256 static struct state gmtmem; 257 #define lclptr (&lclmem) 258 #define gmtptr (&gmtmem) 259 #endif /* State Farm */ 260 261 #ifndef TZ_STRLEN_MAX 262 #define TZ_STRLEN_MAX 255 263 #endif /* !defined TZ_STRLEN_MAX */ 264 265 static char lcl_TZname[TZ_STRLEN_MAX + 1]; 266 static int lcl_is_set; 267 static int gmt_is_set; 268 269 char * tzname[2] = { 270 wildabbr, 271 wildabbr 272 }; 273 274 /* 275 ** Section 4.12.3 of X3.159-1989 requires that 276 ** Except for the strftime function, these functions [asctime, 277 ** ctime, gmtime, localtime] return values in one of two static 278 ** objects: a broken-down time structure and an array of char. 279 ** Thanks to Paul Eggert for noting this. 280 */ 281 282 static struct tm tmGlobal; 283 284 #ifdef USG_COMPAT 285 time_t timezone = 0; 286 int daylight = 0; 287 #endif /* defined USG_COMPAT */ 288 289 #ifdef ALTZONE 290 time_t altzone = 0; 291 #endif /* defined ALTZONE */ 292 293 static long 294 detzcode(codep) 295 const char * const codep; 296 { 297 register long result; 298 register int i; 299 300 result = (codep[0] & 0x80) ? ~0L : 0; 301 for (i = 0; i < 4; ++i) 302 result = (result << 8) | (codep[i] & 0xff); 303 return result; 304 } 305 306 static time_t 307 detzcode64(codep) 308 const char * const codep; 309 { 310 register time_t result; 311 register int i; 312 313 result = (codep[0] & 0x80) ? (~(int_fast64_t) 0) : 0; 314 for (i = 0; i < 8; ++i) 315 result = result * 256 + (codep[i] & 0xff); 316 return result; 317 } 318 319 static void 320 settzname P((void)) 321 { 322 register struct state * const sp = lclptr; 323 register int i; 324 325 tzname[0] = wildabbr; 326 tzname[1] = wildabbr; 327 #ifdef USG_COMPAT 328 daylight = 0; 329 timezone = 0; 330 #endif /* defined USG_COMPAT */ 331 #ifdef ALTZONE 332 altzone = 0; 333 #endif /* defined ALTZONE */ 334 #ifdef ALL_STATE 335 if (sp == NULL) { 336 tzname[0] = tzname[1] = gmt; 337 return; 338 } 339 #endif /* defined ALL_STATE */ 340 for (i = 0; i < sp->typecnt; ++i) { 341 register const struct ttinfo * const ttisp = &sp->ttis[i]; 342 343 tzname[ttisp->tt_isdst] = 344 &sp->chars[ttisp->tt_abbrind]; 345 #ifdef USG_COMPAT 346 if (ttisp->tt_isdst) 347 daylight = 1; 348 if (i == 0 || !ttisp->tt_isdst) 349 timezone = -(ttisp->tt_gmtoff); 350 #endif /* defined USG_COMPAT */ 351 #ifdef ALTZONE 352 if (i == 0 || ttisp->tt_isdst) 353 altzone = -(ttisp->tt_gmtoff); 354 #endif /* defined ALTZONE */ 355 } 356 /* 357 ** And to get the latest zone names into tzname. . . 358 */ 359 for (i = 0; i < sp->timecnt; ++i) { 360 register const struct ttinfo * const ttisp = 361 &sp->ttis[ 362 sp->types[i]]; 363 364 tzname[ttisp->tt_isdst] = 365 &sp->chars[ttisp->tt_abbrind]; 366 } 367 /* 368 ** Finally, scrub the abbreviations. 369 ** First, replace bogus characters. 370 */ 371 for (i = 0; i < sp->charcnt; ++i) 372 if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL) 373 sp->chars[i] = TZ_ABBR_ERR_CHAR; 374 /* 375 ** Second, truncate long abbreviations. 376 */ 377 for (i = 0; i < sp->typecnt; ++i) { 378 register const struct ttinfo * const ttisp = &sp->ttis[i]; 379 register char * cp = &sp->chars[ttisp->tt_abbrind]; 380 381 if (strlen(cp) > TZ_ABBR_MAX_LEN && 382 strcmp(cp, GRANDPARENTED) != 0) 383 *(cp + TZ_ABBR_MAX_LEN) = '\0'; 384 } 385 } 386 387 static int 388 differ_by_repeat(t1, t0) 389 const time_t t1; 390 const time_t t0; 391 { 392 if (TYPE_INTEGRAL(time_t) && 393 TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS) 394 return 0; 395 #if SECSPERREPEAT_BITS <= 32 /* to avoid compiler warning (condition is always false) */ 396 return (t1 - t0) == SECSPERREPEAT; 397 #else 398 return 0; 399 #endif 400 } 401 402 static int toint(unsigned char *s) { 403 return (s[0] << 24) | (s[1] << 16) | (s[2] << 8) | s[3]; 404 } 405 406 static int 407 tzload(const char* name, struct state* const sp, const int doextend) 408 { 409 register const char * p; 410 register int i; 411 register int fid; 412 register int stored; 413 register int nread; 414 union { 415 struct tzhead tzhead; 416 char buf[2 * sizeof(struct tzhead) + 417 2 * sizeof *sp + 418 4 * TZ_MAX_TIMES]; 419 } u; 420 int toread = sizeof u.buf; 421 422 if (name == NULL && (name = TZDEFAULT) == NULL) { 423 XLOG(("tzload: null 'name' parameter\n" )); 424 return -1; 425 } 426 { 427 register int doaccess; 428 /* 429 ** Section 4.9.1 of the C standard says that 430 ** "FILENAME_MAX expands to an integral constant expression 431 ** that is the size needed for an array of char large enough 432 ** to hold the longest file name string that the implementation 433 ** guarantees can be opened." 434 */ 435 char fullname[FILENAME_MAX + 1]; 436 char *origname = (char*) name; 437 438 if (name[0] == ':') 439 ++name; 440 doaccess = name[0] == '/'; 441 if (!doaccess) { 442 if ((p = TZDIR) == NULL) { 443 XLOG(("tzload: null TZDIR macro ?\n" )); 444 return -1; 445 } 446 if ((strlen(p) + strlen(name) + 1) >= sizeof fullname) { 447 XLOG(( "tzload: path too long: %s/%s\n", p, name )); 448 return -1; 449 } 450 (void) strcpy(fullname, p); 451 (void) strcat(fullname, "/"); 452 (void) strcat(fullname, name); 453 /* 454 ** Set doaccess if '.' (as in "../") shows up in name. 455 */ 456 if (strchr(name, '.') != NULL) 457 doaccess = TRUE; 458 name = fullname; 459 } 460 if (doaccess && access(name, R_OK) != 0) { 461 XLOG(( "tzload: could not find '%s'\n", name )); 462 return -1; 463 } 464 if ((fid = open(name, OPEN_MODE)) == -1) { 465 fid = __bionic_open_tzdata(origname, &toread); 466 if (fid < 0) { 467 return -1; 468 } 469 } 470 } 471 nread = read(fid, u.buf, toread); 472 if (close(fid) < 0 || nread <= 0) { 473 XLOG(( "tzload: could not read content of '%s'\n", DATAFILE )); 474 return -1; 475 } 476 for (stored = 4; stored <= 8; stored *= 2) { 477 int ttisstdcnt; 478 int ttisgmtcnt; 479 480 ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt); 481 ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt); 482 sp->leapcnt = (int) detzcode(u.tzhead.tzh_leapcnt); 483 sp->timecnt = (int) detzcode(u.tzhead.tzh_timecnt); 484 sp->typecnt = (int) detzcode(u.tzhead.tzh_typecnt); 485 sp->charcnt = (int) detzcode(u.tzhead.tzh_charcnt); 486 p = u.tzhead.tzh_charcnt + sizeof u.tzhead.tzh_charcnt; 487 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || 488 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || 489 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || 490 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS || 491 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) || 492 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0)) 493 return -1; 494 if (nread - (p - u.buf) < 495 sp->timecnt * stored + /* ats */ 496 sp->timecnt + /* types */ 497 sp->typecnt * 6 + /* ttinfos */ 498 sp->charcnt + /* chars */ 499 sp->leapcnt * (stored + 4) + /* lsinfos */ 500 ttisstdcnt + /* ttisstds */ 501 ttisgmtcnt) /* ttisgmts */ 502 return -1; 503 for (i = 0; i < sp->timecnt; ++i) { 504 sp->ats[i] = (stored == 4) ? 505 detzcode(p) : detzcode64(p); 506 p += stored; 507 } 508 for (i = 0; i < sp->timecnt; ++i) { 509 sp->types[i] = (unsigned char) *p++; 510 if (sp->types[i] >= sp->typecnt) 511 return -1; 512 } 513 for (i = 0; i < sp->typecnt; ++i) { 514 register struct ttinfo * ttisp; 515 516 ttisp = &sp->ttis[i]; 517 ttisp->tt_gmtoff = detzcode(p); 518 p += 4; 519 ttisp->tt_isdst = (unsigned char) *p++; 520 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) 521 return -1; 522 ttisp->tt_abbrind = (unsigned char) *p++; 523 if (ttisp->tt_abbrind < 0 || 524 ttisp->tt_abbrind > sp->charcnt) 525 return -1; 526 } 527 for (i = 0; i < sp->charcnt; ++i) 528 sp->chars[i] = *p++; 529 sp->chars[i] = '\0'; /* ensure '\0' at end */ 530 for (i = 0; i < sp->leapcnt; ++i) { 531 register struct lsinfo * lsisp; 532 533 lsisp = &sp->lsis[i]; 534 lsisp->ls_trans = (stored == 4) ? 535 detzcode(p) : detzcode64(p); 536 p += stored; 537 lsisp->ls_corr = detzcode(p); 538 p += 4; 539 } 540 for (i = 0; i < sp->typecnt; ++i) { 541 register struct ttinfo * ttisp; 542 543 ttisp = &sp->ttis[i]; 544 if (ttisstdcnt == 0) 545 ttisp->tt_ttisstd = FALSE; 546 else { 547 ttisp->tt_ttisstd = *p++; 548 if (ttisp->tt_ttisstd != TRUE && 549 ttisp->tt_ttisstd != FALSE) 550 return -1; 551 } 552 } 553 for (i = 0; i < sp->typecnt; ++i) { 554 register struct ttinfo * ttisp; 555 556 ttisp = &sp->ttis[i]; 557 if (ttisgmtcnt == 0) 558 ttisp->tt_ttisgmt = FALSE; 559 else { 560 ttisp->tt_ttisgmt = *p++; 561 if (ttisp->tt_ttisgmt != TRUE && 562 ttisp->tt_ttisgmt != FALSE) 563 return -1; 564 } 565 } 566 /* 567 ** Out-of-sort ats should mean we're running on a 568 ** signed time_t system but using a data file with 569 ** unsigned values (or vice versa). 570 */ 571 for (i = 0; i < sp->timecnt - 2; ++i) 572 if (sp->ats[i] > sp->ats[i + 1]) { 573 ++i; 574 if (TYPE_SIGNED(time_t)) { 575 /* 576 ** Ignore the end (easy). 577 */ 578 sp->timecnt = i; 579 } else { 580 /* 581 ** Ignore the beginning (harder). 582 */ 583 register int j; 584 585 for (j = 0; j + i < sp->timecnt; ++j) { 586 sp->ats[j] = sp->ats[j + i]; 587 sp->types[j] = sp->types[j + i]; 588 } 589 sp->timecnt = j; 590 } 591 break; 592 } 593 /* 594 ** If this is an old file, we're done. 595 */ 596 if (u.tzhead.tzh_version[0] == '\0') 597 break; 598 nread -= p - u.buf; 599 for (i = 0; i < nread; ++i) 600 u.buf[i] = p[i]; 601 /* 602 ** If this is a narrow integer time_t system, we're done. 603 */ 604 if (stored >= (int) sizeof(time_t) && TYPE_INTEGRAL(time_t)) 605 break; 606 } 607 if (doextend && nread > 2 && 608 u.buf[0] == '\n' && u.buf[nread - 1] == '\n' && 609 sp->typecnt + 2 <= TZ_MAX_TYPES) { 610 struct state ts; 611 register int result; 612 613 u.buf[nread - 1] = '\0'; 614 result = tzparse(&u.buf[1], &ts, FALSE); 615 if (result == 0 && ts.typecnt == 2 && 616 sp->charcnt + ts.charcnt <= TZ_MAX_CHARS) { 617 for (i = 0; i < 2; ++i) 618 ts.ttis[i].tt_abbrind += 619 sp->charcnt; 620 for (i = 0; i < ts.charcnt; ++i) 621 sp->chars[sp->charcnt++] = 622 ts.chars[i]; 623 i = 0; 624 while (i < ts.timecnt && 625 ts.ats[i] <= 626 sp->ats[sp->timecnt - 1]) 627 ++i; 628 while (i < ts.timecnt && 629 sp->timecnt < TZ_MAX_TIMES) { 630 sp->ats[sp->timecnt] = 631 ts.ats[i]; 632 sp->types[sp->timecnt] = 633 sp->typecnt + 634 ts.types[i]; 635 ++sp->timecnt; 636 ++i; 637 } 638 sp->ttis[sp->typecnt++] = ts.ttis[0]; 639 sp->ttis[sp->typecnt++] = ts.ttis[1]; 640 } 641 } 642 i = 2 * YEARSPERREPEAT; 643 sp->goback = sp->goahead = sp->timecnt > i; 644 sp->goback &= sp->types[i] == sp->types[0] && 645 differ_by_repeat(sp->ats[i], sp->ats[0]); 646 sp->goahead &= 647 sp->types[sp->timecnt - 1] == sp->types[sp->timecnt - 1 - i] && 648 differ_by_repeat(sp->ats[sp->timecnt - 1], 649 sp->ats[sp->timecnt - 1 - i]); 650 XLOG(( "tzload: load ok !!\n" )); 651 return 0; 652 } 653 654 static const int mon_lengths[2][MONSPERYEAR] = { 655 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 656 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } 657 }; 658 659 static const int year_lengths[2] = { 660 DAYSPERNYEAR, DAYSPERLYEAR 661 }; 662 663 /* 664 ** Given a pointer into a time zone string, scan until a character that is not 665 ** a valid character in a zone name is found. Return a pointer to that 666 ** character. 667 */ 668 669 static const char * 670 getzname(strp) 671 register const char * strp; 672 { 673 register char c; 674 675 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && 676 c != '+') 677 ++strp; 678 return strp; 679 } 680 681 /* 682 ** Given a pointer into an extended time zone string, scan until the ending 683 ** delimiter of the zone name is located. Return a pointer to the delimiter. 684 ** 685 ** As with getzname above, the legal character set is actually quite 686 ** restricted, with other characters producing undefined results. 687 ** We don't do any checking here; checking is done later in common-case code. 688 */ 689 690 static const char * 691 getqzname(register const char *strp, const int delim) 692 { 693 register int c; 694 695 while ((c = *strp) != '\0' && c != delim) 696 ++strp; 697 return strp; 698 } 699 700 /* 701 ** Given a pointer into a time zone string, extract a number from that string. 702 ** Check that the number is within a specified range; if it is not, return 703 ** NULL. 704 ** Otherwise, return a pointer to the first character not part of the number. 705 */ 706 707 static const char * 708 getnum(strp, nump, min, max) 709 register const char * strp; 710 int * const nump; 711 const int min; 712 const int max; 713 { 714 register char c; 715 register int num; 716 717 if (strp == NULL || !is_digit(c = *strp)) 718 return NULL; 719 num = 0; 720 do { 721 num = num * 10 + (c - '0'); 722 if (num > max) 723 return NULL; /* illegal value */ 724 c = *++strp; 725 } while (is_digit(c)); 726 if (num < min) 727 return NULL; /* illegal value */ 728 *nump = num; 729 return strp; 730 } 731 732 /* 733 ** Given a pointer into a time zone string, extract a number of seconds, 734 ** in hh[:mm[:ss]] form, from the string. 735 ** If any error occurs, return NULL. 736 ** Otherwise, return a pointer to the first character not part of the number 737 ** of seconds. 738 */ 739 740 static const char * 741 getsecs(strp, secsp) 742 register const char * strp; 743 long * const secsp; 744 { 745 int num; 746 747 /* 748 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like 749 ** "M10.4.6/26", which does not conform to Posix, 750 ** but which specifies the equivalent of 751 ** ``02:00 on the first Sunday on or after 23 Oct''. 752 */ 753 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); 754 if (strp == NULL) 755 return NULL; 756 *secsp = num * (long) SECSPERHOUR; 757 if (*strp == ':') { 758 ++strp; 759 strp = getnum(strp, &num, 0, MINSPERHOUR - 1); 760 if (strp == NULL) 761 return NULL; 762 *secsp += num * SECSPERMIN; 763 if (*strp == ':') { 764 ++strp; 765 /* `SECSPERMIN' allows for leap seconds. */ 766 strp = getnum(strp, &num, 0, SECSPERMIN); 767 if (strp == NULL) 768 return NULL; 769 *secsp += num; 770 } 771 } 772 return strp; 773 } 774 775 /* 776 ** Given a pointer into a time zone string, extract an offset, in 777 ** [+-]hh[:mm[:ss]] form, from the string. 778 ** If any error occurs, return NULL. 779 ** Otherwise, return a pointer to the first character not part of the time. 780 */ 781 782 static const char * 783 getoffset(strp, offsetp) 784 register const char * strp; 785 long * const offsetp; 786 { 787 register int neg = 0; 788 789 if (*strp == '-') { 790 neg = 1; 791 ++strp; 792 } else if (*strp == '+') 793 ++strp; 794 strp = getsecs(strp, offsetp); 795 if (strp == NULL) 796 return NULL; /* illegal time */ 797 if (neg) 798 *offsetp = -*offsetp; 799 return strp; 800 } 801 802 /* 803 ** Given a pointer into a time zone string, extract a rule in the form 804 ** date[/time]. See POSIX section 8 for the format of "date" and "time". 805 ** If a valid rule is not found, return NULL. 806 ** Otherwise, return a pointer to the first character not part of the rule. 807 */ 808 809 static const char * 810 getrule(strp, rulep) 811 const char * strp; 812 register struct rule * const rulep; 813 { 814 if (*strp == 'J') { 815 /* 816 ** Julian day. 817 */ 818 rulep->r_type = JULIAN_DAY; 819 ++strp; 820 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); 821 } else if (*strp == 'M') { 822 /* 823 ** Month, week, day. 824 */ 825 rulep->r_type = MONTH_NTH_DAY_OF_WEEK; 826 ++strp; 827 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); 828 if (strp == NULL) 829 return NULL; 830 if (*strp++ != '.') 831 return NULL; 832 strp = getnum(strp, &rulep->r_week, 1, 5); 833 if (strp == NULL) 834 return NULL; 835 if (*strp++ != '.') 836 return NULL; 837 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); 838 } else if (is_digit(*strp)) { 839 /* 840 ** Day of year. 841 */ 842 rulep->r_type = DAY_OF_YEAR; 843 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); 844 } else return NULL; /* invalid format */ 845 if (strp == NULL) 846 return NULL; 847 if (*strp == '/') { 848 /* 849 ** Time specified. 850 */ 851 ++strp; 852 strp = getsecs(strp, &rulep->r_time); 853 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ 854 return strp; 855 } 856 857 /* 858 ** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the 859 ** year, a rule, and the offset from UTC at the time that rule takes effect, 860 ** calculate the Epoch-relative time that rule takes effect. 861 */ 862 863 static time_t 864 transtime(janfirst, year, rulep, offset) 865 const time_t janfirst; 866 const int year; 867 register const struct rule * const rulep; 868 const long offset; 869 { 870 register int leapyear; 871 register time_t value; 872 register int i; 873 int d, m1, yy0, yy1, yy2, dow; 874 875 INITIALIZE(value); 876 leapyear = isleap(year); 877 switch (rulep->r_type) { 878 879 case JULIAN_DAY: 880 /* 881 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap 882 ** years. 883 ** In non-leap years, or if the day number is 59 or less, just 884 ** add SECSPERDAY times the day number-1 to the time of 885 ** January 1, midnight, to get the day. 886 */ 887 value = janfirst + (rulep->r_day - 1) * SECSPERDAY; 888 if (leapyear && rulep->r_day >= 60) 889 value += SECSPERDAY; 890 break; 891 892 case DAY_OF_YEAR: 893 /* 894 ** n - day of year. 895 ** Just add SECSPERDAY times the day number to the time of 896 ** January 1, midnight, to get the day. 897 */ 898 value = janfirst + rulep->r_day * SECSPERDAY; 899 break; 900 901 case MONTH_NTH_DAY_OF_WEEK: 902 /* 903 ** Mm.n.d - nth "dth day" of month m. 904 */ 905 value = janfirst; 906 for (i = 0; i < rulep->r_mon - 1; ++i) 907 value += mon_lengths[leapyear][i] * SECSPERDAY; 908 909 /* 910 ** Use Zeller's Congruence to get day-of-week of first day of 911 ** month. 912 */ 913 m1 = (rulep->r_mon + 9) % 12 + 1; 914 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; 915 yy1 = yy0 / 100; 916 yy2 = yy0 % 100; 917 dow = ((26 * m1 - 2) / 10 + 918 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; 919 if (dow < 0) 920 dow += DAYSPERWEEK; 921 922 /* 923 ** "dow" is the day-of-week of the first day of the month. Get 924 ** the day-of-month (zero-origin) of the first "dow" day of the 925 ** month. 926 */ 927 d = rulep->r_day - dow; 928 if (d < 0) 929 d += DAYSPERWEEK; 930 for (i = 1; i < rulep->r_week; ++i) { 931 if (d + DAYSPERWEEK >= 932 mon_lengths[leapyear][rulep->r_mon - 1]) 933 break; 934 d += DAYSPERWEEK; 935 } 936 937 /* 938 ** "d" is the day-of-month (zero-origin) of the day we want. 939 */ 940 value += d * SECSPERDAY; 941 break; 942 } 943 944 /* 945 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in 946 ** question. To get the Epoch-relative time of the specified local 947 ** time on that day, add the transition time and the current offset 948 ** from UTC. 949 */ 950 return value + rulep->r_time + offset; 951 } 952 953 /* 954 ** Given a POSIX section 8-style TZ string, fill in the rule tables as 955 ** appropriate. 956 */ 957 958 static int 959 tzparse(name, sp, lastditch) 960 const char * name; 961 register struct state * const sp; 962 const int lastditch; 963 { 964 const char * stdname; 965 const char * dstname; 966 size_t stdlen; 967 size_t dstlen; 968 long stdoffset; 969 long dstoffset; 970 register time_t * atp; 971 register unsigned char * typep; 972 register char * cp; 973 register int load_result; 974 975 INITIALIZE(dstname); 976 stdname = name; 977 if (lastditch) { 978 stdlen = strlen(name); /* length of standard zone name */ 979 name += stdlen; 980 if (stdlen >= sizeof sp->chars) 981 stdlen = (sizeof sp->chars) - 1; 982 stdoffset = 0; 983 } else { 984 if (*name == '<') { 985 name++; 986 stdname = name; 987 name = getqzname(name, '>'); 988 if (*name != '>') 989 return (-1); 990 stdlen = name - stdname; 991 name++; 992 } else { 993 name = getzname(name); 994 stdlen = name - stdname; 995 } 996 if (*name == '\0') 997 return -1; 998 name = getoffset(name, &stdoffset); 999 if (name == NULL) 1000 return -1; 1001 } 1002 load_result = tzload(TZDEFRULES, sp, FALSE); 1003 if (load_result != 0) 1004 sp->leapcnt = 0; /* so, we're off a little */ 1005 sp->timecnt = 0; 1006 if (*name != '\0') { 1007 if (*name == '<') { 1008 dstname = ++name; 1009 name = getqzname(name, '>'); 1010 if (*name != '>') 1011 return -1; 1012 dstlen = name - dstname; 1013 name++; 1014 } else { 1015 dstname = name; 1016 name = getzname(name); 1017 dstlen = name - dstname; /* length of DST zone name */ 1018 } 1019 if (*name != '\0' && *name != ',' && *name != ';') { 1020 name = getoffset(name, &dstoffset); 1021 if (name == NULL) 1022 return -1; 1023 } else dstoffset = stdoffset - SECSPERHOUR; 1024 if (*name == '\0' && load_result != 0) 1025 name = TZDEFRULESTRING; 1026 if (*name == ',' || *name == ';') { 1027 struct rule start; 1028 struct rule end; 1029 register int year; 1030 register time_t janfirst; 1031 time_t starttime; 1032 time_t endtime; 1033 1034 ++name; 1035 if ((name = getrule(name, &start)) == NULL) 1036 return -1; 1037 if (*name++ != ',') 1038 return -1; 1039 if ((name = getrule(name, &end)) == NULL) 1040 return -1; 1041 if (*name != '\0') 1042 return -1; 1043 sp->typecnt = 2; /* standard time and DST */ 1044 /* 1045 ** Two transitions per year, from EPOCH_YEAR forward. 1046 */ 1047 sp->ttis[0].tt_gmtoff = -dstoffset; 1048 sp->ttis[0].tt_isdst = 1; 1049 sp->ttis[0].tt_abbrind = stdlen + 1; 1050 sp->ttis[1].tt_gmtoff = -stdoffset; 1051 sp->ttis[1].tt_isdst = 0; 1052 sp->ttis[1].tt_abbrind = 0; 1053 atp = sp->ats; 1054 typep = sp->types; 1055 janfirst = 0; 1056 for (year = EPOCH_YEAR; 1057 sp->timecnt + 2 <= TZ_MAX_TIMES; 1058 ++year) { 1059 time_t newfirst; 1060 1061 starttime = transtime(janfirst, year, &start, 1062 stdoffset); 1063 endtime = transtime(janfirst, year, &end, 1064 dstoffset); 1065 if (starttime > endtime) { 1066 *atp++ = endtime; 1067 *typep++ = 1; /* DST ends */ 1068 *atp++ = starttime; 1069 *typep++ = 0; /* DST begins */ 1070 } else { 1071 *atp++ = starttime; 1072 *typep++ = 0; /* DST begins */ 1073 *atp++ = endtime; 1074 *typep++ = 1; /* DST ends */ 1075 } 1076 sp->timecnt += 2; 1077 newfirst = janfirst; 1078 newfirst += year_lengths[isleap(year)] * 1079 SECSPERDAY; 1080 if (newfirst <= janfirst) 1081 break; 1082 janfirst = newfirst; 1083 } 1084 } else { 1085 register long theirstdoffset; 1086 register long theirdstoffset; 1087 register long theiroffset; 1088 register int isdst; 1089 register int i; 1090 register int j; 1091 1092 if (*name != '\0') 1093 return -1; 1094 /* 1095 ** Initial values of theirstdoffset and theirdstoffset. 1096 */ 1097 theirstdoffset = 0; 1098 for (i = 0; i < sp->timecnt; ++i) { 1099 j = sp->types[i]; 1100 if (!sp->ttis[j].tt_isdst) { 1101 theirstdoffset = 1102 -sp->ttis[j].tt_gmtoff; 1103 break; 1104 } 1105 } 1106 theirdstoffset = 0; 1107 for (i = 0; i < sp->timecnt; ++i) { 1108 j = sp->types[i]; 1109 if (sp->ttis[j].tt_isdst) { 1110 theirdstoffset = 1111 -sp->ttis[j].tt_gmtoff; 1112 break; 1113 } 1114 } 1115 /* 1116 ** Initially we're assumed to be in standard time. 1117 */ 1118 isdst = FALSE; 1119 theiroffset = theirstdoffset; 1120 /* 1121 ** Now juggle transition times and types 1122 ** tracking offsets as you do. 1123 */ 1124 for (i = 0; i < sp->timecnt; ++i) { 1125 j = sp->types[i]; 1126 sp->types[i] = sp->ttis[j].tt_isdst; 1127 if (sp->ttis[j].tt_ttisgmt) { 1128 /* No adjustment to transition time */ 1129 } else { 1130 /* 1131 ** If summer time is in effect, and the 1132 ** transition time was not specified as 1133 ** standard time, add the summer time 1134 ** offset to the transition time; 1135 ** otherwise, add the standard time 1136 ** offset to the transition time. 1137 */ 1138 /* 1139 ** Transitions from DST to DDST 1140 ** will effectively disappear since 1141 ** POSIX provides for only one DST 1142 ** offset. 1143 */ 1144 if (isdst && !sp->ttis[j].tt_ttisstd) { 1145 sp->ats[i] += dstoffset - 1146 theirdstoffset; 1147 } else { 1148 sp->ats[i] += stdoffset - 1149 theirstdoffset; 1150 } 1151 } 1152 theiroffset = -sp->ttis[j].tt_gmtoff; 1153 if (sp->ttis[j].tt_isdst) 1154 theirdstoffset = theiroffset; 1155 else theirstdoffset = theiroffset; 1156 } 1157 /* 1158 ** Finally, fill in ttis. 1159 ** ttisstd and ttisgmt need not be handled. 1160 */ 1161 sp->ttis[0].tt_gmtoff = -stdoffset; 1162 sp->ttis[0].tt_isdst = FALSE; 1163 sp->ttis[0].tt_abbrind = 0; 1164 sp->ttis[1].tt_gmtoff = -dstoffset; 1165 sp->ttis[1].tt_isdst = TRUE; 1166 sp->ttis[1].tt_abbrind = stdlen + 1; 1167 sp->typecnt = 2; 1168 } 1169 } else { 1170 dstlen = 0; 1171 sp->typecnt = 1; /* only standard time */ 1172 sp->timecnt = 0; 1173 sp->ttis[0].tt_gmtoff = -stdoffset; 1174 sp->ttis[0].tt_isdst = 0; 1175 sp->ttis[0].tt_abbrind = 0; 1176 } 1177 sp->charcnt = stdlen + 1; 1178 if (dstlen != 0) 1179 sp->charcnt += dstlen + 1; 1180 if ((size_t) sp->charcnt > sizeof sp->chars) 1181 return -1; 1182 cp = sp->chars; 1183 (void) strncpy(cp, stdname, stdlen); 1184 cp += stdlen; 1185 *cp++ = '\0'; 1186 if (dstlen != 0) { 1187 (void) strncpy(cp, dstname, dstlen); 1188 *(cp + dstlen) = '\0'; 1189 } 1190 return 0; 1191 } 1192 1193 static void 1194 gmtload(sp) 1195 struct state * const sp; 1196 { 1197 if (tzload(gmt, sp, TRUE) != 0) 1198 (void) tzparse(gmt, sp, TRUE); 1199 } 1200 1201 static void 1202 tzsetwall P((void)) 1203 { 1204 if (lcl_is_set < 0) 1205 return; 1206 lcl_is_set = -1; 1207 1208 #ifdef ALL_STATE 1209 if (lclptr == NULL) { 1210 lclptr = (struct state *) malloc(sizeof *lclptr); 1211 if (lclptr == NULL) { 1212 settzname(); /* all we can do */ 1213 return; 1214 } 1215 } 1216 #endif /* defined ALL_STATE */ 1217 if (tzload((char *) NULL, lclptr, TRUE) != 0) 1218 gmtload(lclptr); 1219 settzname(); 1220 } 1221 1222 static void 1223 tzset_locked P((void)) 1224 { 1225 register const char * name = NULL; 1226 static char buf[PROP_VALUE_MAX]; 1227 1228 name = getenv("TZ"); 1229 1230 // try the "persist.sys.timezone" system property first 1231 if (name == NULL && __system_property_get("persist.sys.timezone", buf) > 0) 1232 name = buf; 1233 1234 if (name == NULL) { 1235 tzsetwall(); 1236 return; 1237 } 1238 1239 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) 1240 return; 1241 lcl_is_set = strlen(name) < sizeof lcl_TZname; 1242 if (lcl_is_set) 1243 (void) strcpy(lcl_TZname, name); 1244 1245 #ifdef ALL_STATE 1246 if (lclptr == NULL) { 1247 lclptr = (struct state *) malloc(sizeof *lclptr); 1248 if (lclptr == NULL) { 1249 settzname(); /* all we can do */ 1250 return; 1251 } 1252 } 1253 #endif /* defined ALL_STATE */ 1254 if (*name == '\0') { 1255 /* 1256 ** User wants it fast rather than right. 1257 */ 1258 lclptr->leapcnt = 0; /* so, we're off a little */ 1259 lclptr->timecnt = 0; 1260 lclptr->typecnt = 0; 1261 lclptr->ttis[0].tt_isdst = 0; 1262 lclptr->ttis[0].tt_gmtoff = 0; 1263 lclptr->ttis[0].tt_abbrind = 0; 1264 (void) strcpy(lclptr->chars, gmt); 1265 } else if (tzload(name, lclptr, TRUE) != 0) 1266 if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0) 1267 (void) gmtload(lclptr); 1268 settzname(); 1269 } 1270 1271 void 1272 tzset P((void)) 1273 { 1274 _tzLock(); 1275 tzset_locked(); 1276 _tzUnlock(); 1277 } 1278 1279 /* 1280 ** The easy way to behave "as if no library function calls" localtime 1281 ** is to not call it--so we drop its guts into "localsub", which can be 1282 ** freely called. (And no, the PANS doesn't require the above behavior-- 1283 ** but it *is* desirable.) 1284 ** 1285 ** The unused offset argument is for the benefit of mktime variants. 1286 */ 1287 1288 /*ARGSUSED*/ 1289 static struct tm * 1290 localsub(timep, offset, tmp, sp) // android-changed: added sp. 1291 const time_t * const timep; 1292 const long offset; 1293 struct tm * const tmp; 1294 const struct state * sp; // android-added: added sp. 1295 { 1296 register const struct ttinfo * ttisp; 1297 register int i; 1298 register struct tm * result; 1299 const time_t t = *timep; 1300 1301 // BEGIN android-changed: support user-supplied sp. 1302 if (sp == NULL) { 1303 sp = lclptr; 1304 } 1305 // END android-changed 1306 #ifdef ALL_STATE 1307 if (sp == NULL) 1308 return gmtsub(timep, offset, tmp, sp); // android-changed: added sp. 1309 #endif /* defined ALL_STATE */ 1310 if ((sp->goback && t < sp->ats[0]) || 1311 (sp->goahead && t > sp->ats[sp->timecnt - 1])) { 1312 time_t newt = t; 1313 register time_t seconds; 1314 register time_t tcycles; 1315 register int_fast64_t icycles; 1316 1317 if (t < sp->ats[0]) 1318 seconds = sp->ats[0] - t; 1319 else seconds = t - sp->ats[sp->timecnt - 1]; 1320 --seconds; 1321 tcycles = seconds / YEARSPERREPEAT / AVGSECSPERYEAR; 1322 ++tcycles; 1323 icycles = tcycles; 1324 if (tcycles - icycles >= 1 || icycles - tcycles >= 1) 1325 return NULL; 1326 seconds = icycles; 1327 seconds *= YEARSPERREPEAT; 1328 seconds *= AVGSECSPERYEAR; 1329 if (t < sp->ats[0]) 1330 newt += seconds; 1331 else newt -= seconds; 1332 if (newt < sp->ats[0] || 1333 newt > sp->ats[sp->timecnt - 1]) 1334 return NULL; /* "cannot happen" */ 1335 result = localsub(&newt, offset, tmp, sp); // android-changed: added sp. 1336 if (result == tmp) { 1337 register time_t newy; 1338 1339 newy = tmp->tm_year; 1340 if (t < sp->ats[0]) 1341 newy -= icycles * YEARSPERREPEAT; 1342 else newy += icycles * YEARSPERREPEAT; 1343 tmp->tm_year = newy; 1344 if (tmp->tm_year != newy) 1345 return NULL; 1346 } 1347 return result; 1348 } 1349 if (sp->timecnt == 0 || t < sp->ats[0]) { 1350 i = 0; 1351 while (sp->ttis[i].tt_isdst) 1352 if (++i >= sp->typecnt) { 1353 i = 0; 1354 break; 1355 } 1356 } else { 1357 register int lo = 1; 1358 register int hi = sp->timecnt; 1359 1360 while (lo < hi) { 1361 register int mid = (lo + hi) >> 1; 1362 1363 if (t < sp->ats[mid]) 1364 hi = mid; 1365 else lo = mid + 1; 1366 } 1367 i = (int) sp->types[lo - 1]; 1368 } 1369 ttisp = &sp->ttis[i]; 1370 /* 1371 ** To get (wrong) behavior that's compatible with System V Release 2.0 1372 ** you'd replace the statement below with 1373 ** t += ttisp->tt_gmtoff; 1374 ** timesub(&t, 0L, sp, tmp); 1375 */ 1376 result = timesub(&t, ttisp->tt_gmtoff, sp, tmp); 1377 tmp->tm_isdst = ttisp->tt_isdst; 1378 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; 1379 #ifdef TM_ZONE 1380 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; 1381 #endif /* defined TM_ZONE */ 1382 return result; 1383 } 1384 1385 struct tm * 1386 localtime(timep) 1387 const time_t * const timep; 1388 { 1389 return localtime_r(timep, &tmGlobal); 1390 } 1391 1392 /* 1393 ** Re-entrant version of localtime. 1394 */ 1395 1396 struct tm * 1397 localtime_r(timep, tmp) 1398 const time_t * const timep; 1399 struct tm * tmp; 1400 { 1401 struct tm* result; 1402 1403 _tzLock(); 1404 tzset_locked(); 1405 result = localsub(timep, 0L, tmp, NULL); // android-changed: extra parameter. 1406 _tzUnlock(); 1407 1408 return result; 1409 } 1410 1411 /* 1412 ** gmtsub is to gmtime as localsub is to localtime. 1413 */ 1414 1415 static struct tm * 1416 gmtsub(timep, offset, tmp, sp) // android-changed: added sp. 1417 const time_t * const timep; 1418 const long offset; 1419 struct tm * const tmp; 1420 const struct state * sp; // android-changed: added sp. 1421 { 1422 register struct tm * result; 1423 1424 (void) sp; // android-added: unused. 1425 1426 if (!gmt_is_set) { 1427 gmt_is_set = TRUE; 1428 #ifdef ALL_STATE 1429 gmtptr = (struct state *) malloc(sizeof *gmtptr); 1430 if (gmtptr != NULL) 1431 #endif /* defined ALL_STATE */ 1432 gmtload(gmtptr); 1433 } 1434 result = timesub(timep, offset, gmtptr, tmp); 1435 #ifdef TM_ZONE 1436 /* 1437 ** Could get fancy here and deliver something such as 1438 ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero, 1439 ** but this is no time for a treasure hunt. 1440 */ 1441 if (offset != 0) 1442 tmp->TM_ZONE = wildabbr; 1443 else { 1444 #ifdef ALL_STATE 1445 if (gmtptr == NULL) 1446 tmp->TM_ZONE = gmt; 1447 else tmp->TM_ZONE = gmtptr->chars; 1448 #endif /* defined ALL_STATE */ 1449 #ifndef ALL_STATE 1450 tmp->TM_ZONE = gmtptr->chars; 1451 #endif /* State Farm */ 1452 } 1453 #endif /* defined TM_ZONE */ 1454 return result; 1455 } 1456 1457 struct tm * 1458 gmtime(timep) 1459 const time_t * const timep; 1460 { 1461 return gmtime_r(timep, &tmGlobal); 1462 } 1463 1464 /* 1465 * Re-entrant version of gmtime. 1466 */ 1467 1468 struct tm * 1469 gmtime_r(timep, tmp) 1470 const time_t * const timep; 1471 struct tm * tmp; 1472 { 1473 struct tm* result; 1474 1475 _tzLock(); 1476 result = gmtsub(timep, 0L, tmp, NULL); // android-changed: extra parameter. 1477 _tzUnlock(); 1478 1479 return result; 1480 } 1481 1482 #ifdef STD_INSPIRED 1483 #if 0 /* disabled because there is no good documentation for this function */ 1484 struct tm * 1485 offtime(timep, offset) 1486 const time_t * const timep; 1487 const long offset; 1488 { 1489 return gmtsub(timep, offset, &tmGlobal, NULL); // android-changed: extra parameter. 1490 } 1491 #endif /* 0 */ 1492 #endif /* defined STD_INSPIRED */ 1493 1494 /* 1495 ** Return the number of leap years through the end of the given year 1496 ** where, to make the math easy, the answer for year zero is defined as zero. 1497 */ 1498 1499 static int 1500 leaps_thru_end_of(y) 1501 register const int y; 1502 { 1503 return (y >= 0) ? (y / 4 - y / 100 + y / 400) : 1504 -(leaps_thru_end_of(-(y + 1)) + 1); 1505 } 1506 1507 static struct tm * 1508 timesub(timep, offset, sp, tmp) 1509 const time_t * const timep; 1510 const long offset; 1511 register const struct state * const sp; 1512 register struct tm * const tmp; 1513 { 1514 register const struct lsinfo * lp; 1515 register time_t tdays; 1516 register int idays; /* unsigned would be so 2003 */ 1517 register long rem; 1518 int y; 1519 register const int * ip; 1520 register long corr; 1521 register int hit; 1522 register int i; 1523 1524 corr = 0; 1525 hit = 0; 1526 #ifdef ALL_STATE 1527 i = (sp == NULL) ? 0 : sp->leapcnt; 1528 #endif /* defined ALL_STATE */ 1529 #ifndef ALL_STATE 1530 i = sp->leapcnt; 1531 #endif /* State Farm */ 1532 while (--i >= 0) { 1533 lp = &sp->lsis[i]; 1534 if (*timep >= lp->ls_trans) { 1535 if (*timep == lp->ls_trans) { 1536 hit = ((i == 0 && lp->ls_corr > 0) || 1537 lp->ls_corr > sp->lsis[i - 1].ls_corr); 1538 if (hit) 1539 while (i > 0 && 1540 sp->lsis[i].ls_trans == 1541 sp->lsis[i - 1].ls_trans + 1 && 1542 sp->lsis[i].ls_corr == 1543 sp->lsis[i - 1].ls_corr + 1) { 1544 ++hit; 1545 --i; 1546 } 1547 } 1548 corr = lp->ls_corr; 1549 break; 1550 } 1551 } 1552 y = EPOCH_YEAR; 1553 tdays = *timep / SECSPERDAY; 1554 rem = *timep - tdays * SECSPERDAY; 1555 while (tdays < 0 || tdays >= year_lengths[isleap(y)]) { 1556 int newy; 1557 register time_t tdelta; 1558 register int idelta; 1559 register int leapdays; 1560 1561 tdelta = tdays / DAYSPERLYEAR; 1562 idelta = tdelta; 1563 if (tdelta - idelta >= 1 || idelta - tdelta >= 1) 1564 return NULL; 1565 if (idelta == 0) 1566 idelta = (tdays < 0) ? -1 : 1; 1567 newy = y; 1568 if (increment_overflow(&newy, idelta)) 1569 return NULL; 1570 leapdays = leaps_thru_end_of(newy - 1) - 1571 leaps_thru_end_of(y - 1); 1572 tdays -= ((time_t) newy - y) * DAYSPERNYEAR; 1573 tdays -= leapdays; 1574 y = newy; 1575 } 1576 { 1577 register long seconds; 1578 1579 seconds = tdays * SECSPERDAY + 0.5; 1580 tdays = seconds / SECSPERDAY; 1581 rem += seconds - tdays * SECSPERDAY; 1582 } 1583 /* 1584 ** Given the range, we can now fearlessly cast... 1585 */ 1586 idays = tdays; 1587 rem += offset - corr; 1588 while (rem < 0) { 1589 rem += SECSPERDAY; 1590 --idays; 1591 } 1592 while (rem >= SECSPERDAY) { 1593 rem -= SECSPERDAY; 1594 ++idays; 1595 } 1596 while (idays < 0) { 1597 if (increment_overflow(&y, -1)) 1598 return NULL; 1599 idays += year_lengths[isleap(y)]; 1600 } 1601 while (idays >= year_lengths[isleap(y)]) { 1602 idays -= year_lengths[isleap(y)]; 1603 if (increment_overflow(&y, 1)) 1604 return NULL; 1605 } 1606 tmp->tm_year = y; 1607 if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE)) 1608 return NULL; 1609 tmp->tm_yday = idays; 1610 /* 1611 ** The "extra" mods below avoid overflow problems. 1612 */ 1613 tmp->tm_wday = EPOCH_WDAY + 1614 ((y - EPOCH_YEAR) % DAYSPERWEEK) * 1615 (DAYSPERNYEAR % DAYSPERWEEK) + 1616 leaps_thru_end_of(y - 1) - 1617 leaps_thru_end_of(EPOCH_YEAR - 1) + 1618 idays; 1619 tmp->tm_wday %= DAYSPERWEEK; 1620 if (tmp->tm_wday < 0) 1621 tmp->tm_wday += DAYSPERWEEK; 1622 tmp->tm_hour = (int) (rem / SECSPERHOUR); 1623 rem %= SECSPERHOUR; 1624 tmp->tm_min = (int) (rem / SECSPERMIN); 1625 /* 1626 ** A positive leap second requires a special 1627 ** representation. This uses "... ??:59:60" et seq. 1628 */ 1629 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; 1630 ip = mon_lengths[isleap(y)]; 1631 for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon)) 1632 idays -= ip[tmp->tm_mon]; 1633 tmp->tm_mday = (int) (idays + 1); 1634 tmp->tm_isdst = 0; 1635 #ifdef TM_GMTOFF 1636 tmp->TM_GMTOFF = offset; 1637 #endif /* defined TM_GMTOFF */ 1638 return tmp; 1639 } 1640 1641 char * 1642 ctime(timep) 1643 const time_t * const timep; 1644 { 1645 /* 1646 ** Section 4.12.3.2 of X3.159-1989 requires that 1647 ** The ctime function converts the calendar time pointed to by timer 1648 ** to local time in the form of a string. It is equivalent to 1649 ** asctime(localtime(timer)) 1650 */ 1651 return asctime(localtime(timep)); 1652 } 1653 1654 char * 1655 ctime_r(timep, buf) 1656 const time_t * const timep; 1657 char * buf; 1658 { 1659 struct tm mytm; 1660 1661 return asctime_r(localtime_r(timep, &mytm), buf); 1662 } 1663 1664 /* 1665 ** Adapted from code provided by Robert Elz, who writes: 1666 ** The "best" way to do mktime I think is based on an idea of Bob 1667 ** Kridle's (so its said...) from a long time ago. 1668 ** It does a binary search of the time_t space. Since time_t's are 1669 ** just 32 bits, its a max of 32 iterations (even at 64 bits it 1670 ** would still be very reasonable). 1671 */ 1672 1673 #ifndef WRONG 1674 #define WRONG (-1) 1675 #endif /* !defined WRONG */ 1676 1677 /* 1678 ** Simplified normalize logic courtesy Paul Eggert. 1679 */ 1680 1681 static int 1682 increment_overflow(number, delta) 1683 int * number; 1684 int delta; 1685 { 1686 unsigned number0 = (unsigned)*number; 1687 unsigned number1 = (unsigned)(number0 + delta); 1688 1689 *number = (int)number1; 1690 1691 if (delta >= 0) { 1692 return ((int)number1 < (int)number0); 1693 } else { 1694 return ((int)number1 > (int)number0); 1695 } 1696 } 1697 1698 static int 1699 long_increment_overflow(number, delta) 1700 long * number; 1701 int delta; 1702 { 1703 unsigned long number0 = (unsigned long)*number; 1704 unsigned long number1 = (unsigned long)(number0 + delta); 1705 1706 *number = (long)number1; 1707 1708 if (delta >= 0) { 1709 return ((long)number1 < (long)number0); 1710 } else { 1711 return ((long)number1 > (long)number0); 1712 } 1713 } 1714 1715 static int 1716 normalize_overflow(tensptr, unitsptr, base) 1717 int * const tensptr; 1718 int * const unitsptr; 1719 const int base; 1720 { 1721 register int tensdelta; 1722 1723 tensdelta = (*unitsptr >= 0) ? 1724 (*unitsptr / base) : 1725 (-1 - (-1 - *unitsptr) / base); 1726 *unitsptr -= tensdelta * base; 1727 return increment_overflow(tensptr, tensdelta); 1728 } 1729 1730 static int 1731 long_normalize_overflow(tensptr, unitsptr, base) 1732 long * const tensptr; 1733 int * const unitsptr; 1734 const int base; 1735 { 1736 register int tensdelta; 1737 1738 tensdelta = (*unitsptr >= 0) ? 1739 (*unitsptr / base) : 1740 (-1 - (-1 - *unitsptr) / base); 1741 *unitsptr -= tensdelta * base; 1742 return long_increment_overflow(tensptr, tensdelta); 1743 } 1744 1745 static int 1746 tmcomp(atmp, btmp) 1747 register const struct tm * const atmp; 1748 register const struct tm * const btmp; 1749 { 1750 register int result; 1751 1752 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && 1753 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && 1754 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && 1755 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && 1756 (result = (atmp->tm_min - btmp->tm_min)) == 0) 1757 result = atmp->tm_sec - btmp->tm_sec; 1758 return result; 1759 } 1760 1761 static time_t 1762 time2sub(tmp, funcp, offset, okayp, do_norm_secs, sp) // android-changed: added sp 1763 struct tm * const tmp; 1764 struct tm * (* const funcp) P((const time_t*, long, struct tm*, const struct state*)); // android-changed: added state* 1765 const long offset; 1766 int * const okayp; 1767 const int do_norm_secs; 1768 const struct state * sp; // android-changed: added sp 1769 { 1770 register int dir; 1771 register int i, j; 1772 register int saved_seconds; 1773 register long li; 1774 register time_t lo; 1775 register time_t hi; 1776 long y; 1777 time_t newt; 1778 time_t t; 1779 struct tm yourtm, mytm; 1780 1781 *okayp = FALSE; 1782 yourtm = *tmp; 1783 if (do_norm_secs) { 1784 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec, 1785 SECSPERMIN)) 1786 return WRONG; 1787 } 1788 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) 1789 return WRONG; 1790 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) 1791 return WRONG; 1792 y = yourtm.tm_year; 1793 if (long_normalize_overflow(&y, &yourtm.tm_mon, MONSPERYEAR)) 1794 return WRONG; 1795 /* 1796 ** Turn y into an actual year number for now. 1797 ** It is converted back to an offset from TM_YEAR_BASE later. 1798 */ 1799 if (long_increment_overflow(&y, TM_YEAR_BASE)) 1800 return WRONG; 1801 while (yourtm.tm_mday <= 0) { 1802 if (long_increment_overflow(&y, -1)) 1803 return WRONG; 1804 li = y + (1 < yourtm.tm_mon); 1805 yourtm.tm_mday += year_lengths[isleap(li)]; 1806 } 1807 while (yourtm.tm_mday > DAYSPERLYEAR) { 1808 li = y + (1 < yourtm.tm_mon); 1809 yourtm.tm_mday -= year_lengths[isleap(li)]; 1810 if (long_increment_overflow(&y, 1)) 1811 return WRONG; 1812 } 1813 for ( ; ; ) { 1814 i = mon_lengths[isleap(y)][yourtm.tm_mon]; 1815 if (yourtm.tm_mday <= i) 1816 break; 1817 yourtm.tm_mday -= i; 1818 if (++yourtm.tm_mon >= MONSPERYEAR) { 1819 yourtm.tm_mon = 0; 1820 if (long_increment_overflow(&y, 1)) 1821 return WRONG; 1822 } 1823 } 1824 if (long_increment_overflow(&y, -TM_YEAR_BASE)) 1825 return WRONG; 1826 yourtm.tm_year = y; 1827 if (yourtm.tm_year != y) 1828 return WRONG; 1829 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN) 1830 saved_seconds = 0; 1831 else if (y + TM_YEAR_BASE < EPOCH_YEAR) { 1832 /* 1833 ** We can't set tm_sec to 0, because that might push the 1834 ** time below the minimum representable time. 1835 ** Set tm_sec to 59 instead. 1836 ** This assumes that the minimum representable time is 1837 ** not in the same minute that a leap second was deleted from, 1838 ** which is a safer assumption than using 58 would be. 1839 */ 1840 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) 1841 return WRONG; 1842 saved_seconds = yourtm.tm_sec; 1843 yourtm.tm_sec = SECSPERMIN - 1; 1844 } else { 1845 saved_seconds = yourtm.tm_sec; 1846 yourtm.tm_sec = 0; 1847 } 1848 /* 1849 ** Do a binary search (this works whatever time_t's type is). 1850 */ 1851 if (!TYPE_SIGNED(time_t)) { 1852 lo = 0; 1853 hi = lo - 1; 1854 } else if (!TYPE_INTEGRAL(time_t)) { 1855 if (sizeof(time_t) > sizeof(float)) 1856 hi = (time_t) DBL_MAX; 1857 else hi = (time_t) FLT_MAX; 1858 lo = -hi; 1859 } else { 1860 lo = 1; 1861 for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i) 1862 lo *= 2; 1863 hi = -(lo + 1); 1864 } 1865 for ( ; ; ) { 1866 t = lo / 2 + hi / 2; 1867 if (t < lo) 1868 t = lo; 1869 else if (t > hi) 1870 t = hi; 1871 if ((*funcp)(&t, offset, &mytm, sp) == NULL) { // android-changed: added sp. 1872 /* 1873 ** Assume that t is too extreme to be represented in 1874 ** a struct tm; arrange things so that it is less 1875 ** extreme on the next pass. 1876 */ 1877 dir = (t > 0) ? 1 : -1; 1878 } else dir = tmcomp(&mytm, &yourtm); 1879 if (dir != 0) { 1880 if (t == lo) { 1881 if (t == TIME_T_MAX) 1882 return WRONG; 1883 ++t; 1884 ++lo; 1885 } else if (t == hi) { 1886 if (t == TIME_T_MIN) 1887 return WRONG; 1888 --t; 1889 --hi; 1890 } 1891 if (lo > hi) 1892 return WRONG; 1893 if (dir > 0) 1894 hi = t; 1895 else lo = t; 1896 continue; 1897 } 1898 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) 1899 break; 1900 /* 1901 ** Right time, wrong type. 1902 ** Hunt for right time, right type. 1903 ** It's okay to guess wrong since the guess 1904 ** gets checked. 1905 */ 1906 /* 1907 ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. 1908 */ 1909 // BEGIN android-changed: support user-supplied sp 1910 if (sp == NULL) { 1911 sp = (const struct state *) 1912 (((void *) funcp == (void *) localsub) ? 1913 lclptr : gmtptr); 1914 } 1915 // END android-changed 1916 #ifdef ALL_STATE 1917 if (sp == NULL) 1918 return WRONG; 1919 #endif /* defined ALL_STATE */ 1920 for (i = sp->typecnt - 1; i >= 0; --i) { 1921 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) 1922 continue; 1923 for (j = sp->typecnt - 1; j >= 0; --j) { 1924 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) 1925 continue; 1926 newt = t + sp->ttis[j].tt_gmtoff - 1927 sp->ttis[i].tt_gmtoff; 1928 if ((*funcp)(&newt, offset, &mytm, sp) == NULL) // android-changed: added sp. 1929 continue; 1930 if (tmcomp(&mytm, &yourtm) != 0) 1931 continue; 1932 if (mytm.tm_isdst != yourtm.tm_isdst) 1933 continue; 1934 /* 1935 ** We have a match. 1936 */ 1937 t = newt; 1938 goto label; 1939 } 1940 } 1941 return WRONG; 1942 } 1943 label: 1944 newt = t + saved_seconds; 1945 if ((newt < t) != (saved_seconds < 0)) 1946 return WRONG; 1947 t = newt; 1948 if ((*funcp)(&t, offset, tmp, sp)) // android-changed: added sp. 1949 *okayp = TRUE; 1950 return t; 1951 } 1952 1953 // BEGIN android-changed: added sp. 1954 static time_t 1955 time2(tmp, funcp, offset, okayp, sp) 1956 struct tm * const tmp; 1957 struct tm * (* const funcp) P((const time_t*, long, struct tm*, const struct state*)); 1958 const long offset; 1959 int * const okayp; 1960 const struct state * sp; 1961 { 1962 time_t t; 1963 1964 /* 1965 ** First try without normalization of seconds 1966 ** (in case tm_sec contains a value associated with a leap second). 1967 ** If that fails, try with normalization of seconds. 1968 */ 1969 t = time2sub(tmp, funcp, offset, okayp, FALSE, sp); 1970 return *okayp ? t : time2sub(tmp, funcp, offset, okayp, TRUE, sp); 1971 } 1972 // END android-changed 1973 1974 static time_t 1975 time1(tmp, funcp, offset, sp) // android-changed: added sp. 1976 struct tm * const tmp; 1977 struct tm * (* const funcp) P((const time_t *, long, struct tm *, const struct state *)); 1978 const long offset; 1979 const struct state * sp; // android-changed: added sp. 1980 { 1981 register time_t t; 1982 register int samei, otheri; 1983 register int sameind, otherind; 1984 register int i; 1985 register int nseen; 1986 int seen[TZ_MAX_TYPES]; 1987 int types[TZ_MAX_TYPES]; 1988 int okay; 1989 1990 if (tmp->tm_isdst > 1) 1991 tmp->tm_isdst = 1; 1992 t = time2(tmp, funcp, offset, &okay, sp); // android-changed: added sp. 1993 #ifdef PCTS 1994 /* 1995 ** PCTS code courtesy Grant Sullivan. 1996 */ 1997 if (okay) 1998 return t; 1999 if (tmp->tm_isdst < 0) 2000 tmp->tm_isdst = 0; /* reset to std and try again */ 2001 #endif /* defined PCTS */ 2002 #ifndef PCTS 2003 if (okay || tmp->tm_isdst < 0) 2004 return t; 2005 #endif /* !defined PCTS */ 2006 /* 2007 ** We're supposed to assume that somebody took a time of one type 2008 ** and did some math on it that yielded a "struct tm" that's bad. 2009 ** We try to divine the type they started from and adjust to the 2010 ** type they need. 2011 */ 2012 /* 2013 ** The (void *) casts are the benefit of SunOS 3.3 on Sun 2's. 2014 */ 2015 // BEGIN android-changed: support user-supplied sp. 2016 if (sp == NULL) { 2017 sp = (const struct state *) (((void *) funcp == (void *) localsub) ? 2018 lclptr : gmtptr); 2019 } 2020 // BEGIN android-changed 2021 #ifdef ALL_STATE 2022 if (sp == NULL) 2023 return WRONG; 2024 #endif /* defined ALL_STATE */ 2025 for (i = 0; i < sp->typecnt; ++i) 2026 seen[i] = FALSE; 2027 nseen = 0; 2028 for (i = sp->timecnt - 1; i >= 0; --i) 2029 if (!seen[sp->types[i]]) { 2030 seen[sp->types[i]] = TRUE; 2031 types[nseen++] = sp->types[i]; 2032 } 2033 for (sameind = 0; sameind < nseen; ++sameind) { 2034 samei = types[sameind]; 2035 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) 2036 continue; 2037 for (otherind = 0; otherind < nseen; ++otherind) { 2038 otheri = types[otherind]; 2039 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) 2040 continue; 2041 tmp->tm_sec += sp->ttis[otheri].tt_gmtoff - 2042 sp->ttis[samei].tt_gmtoff; 2043 tmp->tm_isdst = !tmp->tm_isdst; 2044 t = time2(tmp, funcp, offset, &okay, sp); // android-changed: added sp. 2045 if (okay) 2046 return t; 2047 tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff - 2048 sp->ttis[samei].tt_gmtoff; 2049 tmp->tm_isdst = !tmp->tm_isdst; 2050 } 2051 } 2052 return WRONG; 2053 } 2054 2055 time_t 2056 mktime(tmp) 2057 struct tm * const tmp; 2058 { 2059 time_t result; 2060 _tzLock(); 2061 tzset_locked(); 2062 result = time1(tmp, localsub, 0L, NULL); // android-changed: extra parameter. 2063 _tzUnlock(); 2064 return result; 2065 } 2066 2067 // BEGIN android-added 2068 2069 // Caches the most recent timezone (http://b/8270865). 2070 static int __bionic_tzload_cached(const char* name, struct state* const sp, const int doextend) { 2071 _tzLock(); 2072 2073 // Our single-item cache. 2074 static char* gCachedTimeZoneName; 2075 static struct state gCachedTimeZone; 2076 2077 // Do we already have this timezone cached? 2078 if (gCachedTimeZoneName != NULL && strcmp(name, gCachedTimeZoneName) == 0) { 2079 *sp = gCachedTimeZone; 2080 _tzUnlock(); 2081 return 0; 2082 } 2083 2084 // Can we load it? 2085 int rc = tzload(name, sp, doextend); 2086 if (rc == 0) { 2087 // Update the cache. 2088 free(gCachedTimeZoneName); 2089 gCachedTimeZoneName = strdup(name); 2090 gCachedTimeZone = *sp; 2091 } 2092 2093 _tzUnlock(); 2094 return rc; 2095 } 2096 2097 // Non-standard API: mktime(3) but with an explicit timezone parameter. 2098 time_t mktime_tz(struct tm* const tmp, const char* tz) { 2099 struct state st; 2100 if (__bionic_tzload_cached(tz, &st, TRUE) != 0) { 2101 // TODO: not sure what's best here, but for now, we fall back to gmt. 2102 gmtload(&st); 2103 } 2104 return time1(tmp, localsub, 0L, &st); 2105 } 2106 2107 // Non-standard API: localtime(3) but with an explicit timezone parameter. 2108 void localtime_tz(const time_t* const timep, struct tm* tmp, const char* tz) { 2109 struct state st; 2110 if (__bionic_tzload_cached(tz, &st, TRUE) != 0) { 2111 // TODO: not sure what's best here, but for now, we fall back to gmt. 2112 gmtload(&st); 2113 } 2114 localsub(timep, 0L, tmp, &st); 2115 } 2116 2117 // END android-added 2118 2119 #ifdef STD_INSPIRED 2120 2121 time_t 2122 timelocal(tmp) 2123 struct tm * const tmp; 2124 { 2125 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 2126 return mktime(tmp); 2127 } 2128 2129 time_t 2130 timegm(tmp) 2131 struct tm * const tmp; 2132 { 2133 time_t result; 2134 2135 tmp->tm_isdst = 0; 2136 _tzLock(); 2137 result = time1(tmp, gmtsub, 0L, NULL); // android-changed: extra parameter. 2138 _tzUnlock(); 2139 2140 return result; 2141 } 2142 2143 #if 0 /* disable due to lack of clear documentation on this function */ 2144 time_t 2145 timeoff(tmp, offset) 2146 struct tm * const tmp; 2147 const long offset; 2148 { 2149 time_t result; 2150 2151 tmp->tm_isdst = 0; 2152 _tzLock(); 2153 result = time1(tmp, gmtsub, offset, NULL); // android-changed: extra parameter. 2154 _tzUnlock(); 2155 2156 return result; 2157 } 2158 #endif /* 0 */ 2159 2160 #endif /* defined STD_INSPIRED */ 2161 2162 #ifdef CMUCS 2163 2164 /* 2165 ** The following is supplied for compatibility with 2166 ** previous versions of the CMUCS runtime library. 2167 */ 2168 2169 long 2170 gtime(tmp) 2171 struct tm * const tmp; 2172 { 2173 const time_t t = mktime(tmp); 2174 2175 if (t == WRONG) 2176 return -1; 2177 return t; 2178 } 2179 2180 #endif /* defined CMUCS */ 2181 2182 /* 2183 ** XXX--is the below the right way to conditionalize?? 2184 */ 2185 2186 #ifdef STD_INSPIRED 2187 2188 /* 2189 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 2190 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which 2191 ** is not the case if we are accounting for leap seconds. 2192 ** So, we provide the following conversion routines for use 2193 ** when exchanging timestamps with POSIX conforming systems. 2194 */ 2195 2196 static long 2197 leapcorr(timep) 2198 time_t * timep; 2199 { 2200 register struct state * sp; 2201 register struct lsinfo * lp; 2202 register int i; 2203 2204 sp = lclptr; 2205 i = sp->leapcnt; 2206 while (--i >= 0) { 2207 lp = &sp->lsis[i]; 2208 if (*timep >= lp->ls_trans) 2209 return lp->ls_corr; 2210 } 2211 return 0; 2212 } 2213 2214 time_t 2215 time2posix(t) 2216 time_t t; 2217 { 2218 tzset(); 2219 return t - leapcorr(&t); 2220 } 2221 2222 time_t 2223 posix2time(t) 2224 time_t t; 2225 { 2226 time_t x; 2227 time_t y; 2228 2229 tzset(); 2230 /* 2231 ** For a positive leap second hit, the result 2232 ** is not unique. For a negative leap second 2233 ** hit, the corresponding time doesn't exist, 2234 ** so we return an adjacent second. 2235 */ 2236 x = t + leapcorr(&t); 2237 y = x - leapcorr(&x); 2238 if (y < t) { 2239 do { 2240 x++; 2241 y = x - leapcorr(&x); 2242 } while (y < t); 2243 if (t != y) 2244 return x - 1; 2245 } else if (y > t) { 2246 do { 2247 --x; 2248 y = x - leapcorr(&x); 2249 } while (y > t); 2250 if (t != y) 2251 return x + 1; 2252 } 2253 return x; 2254 } 2255 2256 #endif /* defined STD_INSPIRED */ 2257 2258 #include <assert.h> 2259 #include <stdint.h> 2260 #include <arpa/inet.h> // For ntohl(3). 2261 2262 static int __bionic_open_tzdata_path(const char* path, const char* olson_id, int* data_size) { 2263 int fd = TEMP_FAILURE_RETRY(open(path, OPEN_MODE)); 2264 if (fd == -1) { 2265 XLOG(("%s: could not open \"%s\": %s\n", __FUNCTION__, path, strerror(errno))); 2266 return -2; // Distinguish failure to find any data from failure to find a specific id. 2267 } 2268 2269 // byte[12] tzdata_version -- "tzdata2012f\0" 2270 // int index_offset 2271 // int data_offset 2272 // int zonetab_offset 2273 struct bionic_tzdata_header { 2274 char tzdata_version[12]; 2275 int32_t index_offset; 2276 int32_t data_offset; 2277 int32_t zonetab_offset; 2278 } header; 2279 if (TEMP_FAILURE_RETRY(read(fd, &header, sizeof(header))) != sizeof(header)) { 2280 fprintf(stderr, "%s: could not read header: %s\n", __FUNCTION__, strerror(errno)); 2281 close(fd); 2282 return -1; 2283 } 2284 2285 if (strncmp(header.tzdata_version, "tzdata", 6) != 0 || header.tzdata_version[11] != 0) { 2286 fprintf(stderr, "%s: bad magic: %s\n", __FUNCTION__, header.tzdata_version); 2287 close(fd); 2288 return -1; 2289 } 2290 2291 #if 0 2292 fprintf(stderr, "version: %s\n", header.tzdata_version); 2293 fprintf(stderr, "index_offset = %d\n", ntohl(header.index_offset)); 2294 fprintf(stderr, "data_offset = %d\n", ntohl(header.data_offset)); 2295 fprintf(stderr, "zonetab_offset = %d\n", ntohl(header.zonetab_offset)); 2296 #endif 2297 2298 if (TEMP_FAILURE_RETRY(lseek(fd, ntohl(header.index_offset), SEEK_SET)) == -1) { 2299 fprintf(stderr, "%s: couldn't seek to index: %s\n", __FUNCTION__, strerror(errno)); 2300 close(fd); 2301 return -1; 2302 } 2303 2304 off_t specific_zone_offset = -1; 2305 2306 static const size_t NAME_LENGTH = 40; 2307 unsigned char buf[NAME_LENGTH + 3 * sizeof(int32_t)]; 2308 2309 size_t id_count = (ntohl(header.data_offset) - ntohl(header.index_offset)) / sizeof(buf); 2310 for (size_t i = 0; i < id_count; ++i) { 2311 if (TEMP_FAILURE_RETRY(read(fd, buf, sizeof(buf))) != (ssize_t) sizeof(buf)) { 2312 break; 2313 } 2314 2315 char this_id[NAME_LENGTH + 1]; 2316 memcpy(this_id, buf, NAME_LENGTH); 2317 this_id[NAME_LENGTH] = '\0'; 2318 2319 if (strcmp(this_id, olson_id) == 0) { 2320 specific_zone_offset = toint(buf + NAME_LENGTH) + ntohl(header.data_offset); 2321 *data_size = toint(buf + NAME_LENGTH + sizeof(int32_t)); 2322 break; 2323 } 2324 } 2325 2326 if (specific_zone_offset == -1) { 2327 XLOG(("%s: couldn't find zone \"%s\"\n", __FUNCTION__, olson_id)); 2328 close(fd); 2329 return -1; 2330 } 2331 2332 if (TEMP_FAILURE_RETRY(lseek(fd, specific_zone_offset, SEEK_SET)) == -1) { 2333 fprintf(stderr, "%s: could not seek to %ld: %s\n", __FUNCTION__, specific_zone_offset, strerror(errno)); 2334 close(fd); 2335 return -1; 2336 } 2337 2338 return fd; 2339 } 2340 2341 static int __bionic_open_tzdata(const char* olson_id, int* data_size) { 2342 // TODO: use $ANDROID_DATA and $ANDROID_ROOT like libcore, to support bionic on the host. 2343 int fd = __bionic_open_tzdata_path("/data/misc/zoneinfo/tzdata", olson_id, data_size); 2344 if (fd < 0) { 2345 fd = __bionic_open_tzdata_path("/system/usr/share/zoneinfo/tzdata", olson_id, data_size); 2346 if (fd == -2) { 2347 // The first thing that 'recovery' does is try to format the current time. It doesn't have 2348 // any tzdata available, so we must not abort here --- doing so breaks the recovery image! 2349 fprintf(stderr, "%s: couldn't find any tzdata when looking for %s!\n", __FUNCTION__, olson_id); 2350 } 2351 } 2352 return fd; 2353 } 2354
