1 /* $NetBSD: localtime.c,v 1.67 2012/03/20 16:39:08 matt Exp $ */ 2 3 /* 4 ** This file is in the public domain, so clarified as of 5 ** 1996-06-05 by Arthur David Olson. 6 */ 7 8 #include <sys/cdefs.h> 9 #if defined(LIBC_SCCS) && !defined(lint) 10 #if 0 11 static char elsieid[] = "@(#)localtime.c 8.17"; 12 #else 13 __RCSID("$NetBSD: localtime.c,v 1.67 2012/03/20 16:39:08 matt Exp $"); 14 #endif 15 #endif /* LIBC_SCCS and not lint */ 16 17 /* 18 ** Leap second handling from Bradley White. 19 ** POSIX-style TZ environment variable handling from Guy Harris. 20 */ 21 22 /*LINTLIBRARY*/ 23 24 #include "namespace.h" 25 #include "private.h" 26 #include "tzfile.h" 27 #include "fcntl.h" 28 #include "reentrant.h" 29 30 #if defined(__weak_alias) 31 __weak_alias(daylight,_daylight) 32 __weak_alias(tzname,_tzname) 33 #endif 34 35 #include "float.h" /* for FLT_MAX and DBL_MAX */ 36 37 #ifndef TZ_ABBR_MAX_LEN 38 #define TZ_ABBR_MAX_LEN 16 39 #endif /* !defined TZ_ABBR_MAX_LEN */ 40 41 #ifndef TZ_ABBR_CHAR_SET 42 #define TZ_ABBR_CHAR_SET \ 43 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._" 44 #endif /* !defined TZ_ABBR_CHAR_SET */ 45 46 #ifndef TZ_ABBR_ERR_CHAR 47 #define TZ_ABBR_ERR_CHAR '_' 48 #endif /* !defined TZ_ABBR_ERR_CHAR */ 49 50 /* 51 ** SunOS 4.1.1 headers lack O_BINARY. 52 */ 53 54 #ifdef O_BINARY 55 #define OPEN_MODE (O_RDONLY | O_BINARY) 56 #endif /* defined O_BINARY */ 57 #ifndef O_BINARY 58 #define OPEN_MODE O_RDONLY 59 #endif /* !defined O_BINARY */ 60 61 #ifndef WILDABBR 62 /* 63 ** Someone might make incorrect use of a time zone abbreviation: 64 ** 1. They might reference tzname[0] before calling tzset (explicitly 65 ** or implicitly). 66 ** 2. They might reference tzname[1] before calling tzset (explicitly 67 ** or implicitly). 68 ** 3. They might reference tzname[1] after setting to a time zone 69 ** in which Daylight Saving Time is never observed. 70 ** 4. They might reference tzname[0] after setting to a time zone 71 ** in which Standard Time is never observed. 72 ** 5. They might reference tm.TM_ZONE after calling offtime. 73 ** What's best to do in the above cases is open to debate; 74 ** for now, we just set things up so that in any of the five cases 75 ** WILDABBR is used. Another possibility: initialize tzname[0] to the 76 ** string "tzname[0] used before set", and similarly for the other cases. 77 ** And another: initialize tzname[0] to "ERA", with an explanation in the 78 ** manual page of what this "time zone abbreviation" means (doing this so 79 ** that tzname[0] has the "normal" length of three characters). 80 */ 81 #define WILDABBR " " 82 #endif /* !defined WILDABBR */ 83 84 static const char wildabbr[] = WILDABBR; 85 86 static char gmt[] = "GMT"; 87 88 /* 89 ** The DST rules to use if TZ has no rules and we can't load TZDEFRULES. 90 ** We default to US rules as of 1999-08-17. 91 ** POSIX 1003.1 section 8.1.1 says that the default DST rules are 92 ** implementation dependent; for historical reasons, US rules are a 93 ** common default. 94 */ 95 #ifndef TZDEFRULESTRING 96 #define TZDEFRULESTRING ",M4.1.0,M10.5.0" 97 #endif /* !defined TZDEFDST */ 98 99 struct ttinfo { /* time type information */ 100 long tt_gmtoff; /* UTC offset in seconds */ 101 int tt_isdst; /* used to set tm_isdst */ 102 int tt_abbrind; /* abbreviation list index */ 103 int tt_ttisstd; /* TRUE if transition is std time */ 104 int tt_ttisgmt; /* TRUE if transition is UTC */ 105 }; 106 107 struct lsinfo { /* leap second information */ 108 time_t ls_trans; /* transition time */ 109 long ls_corr; /* correction to apply */ 110 }; 111 112 #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) 113 114 #ifdef TZNAME_MAX 115 #define MY_TZNAME_MAX TZNAME_MAX 116 #endif /* defined TZNAME_MAX */ 117 #ifndef TZNAME_MAX 118 #define MY_TZNAME_MAX 255 119 #endif /* !defined TZNAME_MAX */ 120 121 struct __state { 122 int leapcnt; 123 int timecnt; 124 int typecnt; 125 int charcnt; 126 int goback; 127 int goahead; 128 time_t ats[TZ_MAX_TIMES]; 129 unsigned char types[TZ_MAX_TIMES]; 130 struct ttinfo ttis[TZ_MAX_TYPES]; 131 char chars[/*CONSTCOND*/BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt), 132 (2 * (MY_TZNAME_MAX + 1)))]; 133 struct lsinfo lsis[TZ_MAX_LEAPS]; 134 }; 135 136 struct rule { 137 int r_type; /* type of rule--see below */ 138 int r_day; /* day number of rule */ 139 int r_week; /* week number of rule */ 140 int r_mon; /* month number of rule */ 141 long r_time; /* transition time of rule */ 142 }; 143 144 #define JULIAN_DAY 0 /* Jn - Julian day */ 145 #define DAY_OF_YEAR 1 /* n - day of year */ 146 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */ 147 148 typedef struct tm *(*subfun_t)(const timezone_t sp, const time_t *timep, 149 long offset, struct tm *tmp); 150 151 /* 152 ** Prototypes for static functions. 153 */ 154 155 static long detzcode(const char * codep); 156 static time_t detzcode64(const char * codep); 157 static int differ_by_repeat(time_t t1, time_t t0); 158 static const char * getzname(const char * strp); 159 static const char * getqzname(const char * strp, const int delim); 160 static const char * getnum(const char * strp, int * nump, int min, 161 int max); 162 static const char * getsecs(const char * strp, long * secsp); 163 static const char * getoffset(const char * strp, long * offsetp); 164 static const char * getrule(const char * strp, struct rule * rulep); 165 static void gmtload(timezone_t sp); 166 static struct tm * gmtsub(const timezone_t sp, const time_t *timep, 167 long offset, struct tm * tmp); 168 static struct tm * localsub(const timezone_t sp, const time_t *timep, 169 long offset, struct tm *tmp); 170 static int increment_overflow(int * number, int delta); 171 static int leaps_thru_end_of(int y); 172 static int long_increment_overflow(long * number, int delta); 173 static int long_normalize_overflow(long * tensptr, 174 int * unitsptr, int base); 175 static int normalize_overflow(int * tensptr, int * unitsptr, 176 int base); 177 static void settzname(void); 178 static time_t time1(const timezone_t sp, struct tm * const tmp, 179 subfun_t funcp, long offset); 180 static time_t time2(const timezone_t sp, struct tm * const tmp, 181 subfun_t funcp, 182 const long offset, int *const okayp); 183 static time_t time2sub(const timezone_t sp, struct tm * consttmp, 184 subfun_t funcp, const long offset, 185 int *const okayp, const int do_norm_secs); 186 static struct tm * timesub(const timezone_t sp, const time_t * timep, 187 long offset, struct tm * tmp); 188 static int tmcomp(const struct tm * atmp, 189 const struct tm * btmp); 190 static time_t transtime(time_t janfirst, int year, 191 const struct rule * rulep, long offset); 192 static int typesequiv(const timezone_t sp, int a, int b); 193 static int tzload(timezone_t sp, const char * name, 194 int doextend); 195 static int tzparse(timezone_t sp, const char * name, 196 int lastditch); 197 static void tzset_unlocked(void); 198 static void tzsetwall_unlocked(void); 199 static long leapcorr(const timezone_t sp, time_t * timep); 200 201 static timezone_t lclptr; 202 static timezone_t gmtptr; 203 204 #ifndef TZ_STRLEN_MAX 205 #define TZ_STRLEN_MAX 255 206 #endif /* !defined TZ_STRLEN_MAX */ 207 208 static char lcl_TZname[TZ_STRLEN_MAX + 1]; 209 static int lcl_is_set; 210 static int gmt_is_set; 211 212 #if !defined(__LIBC12_SOURCE__) 213 214 __aconst char * tzname[2] = { 215 (__aconst char *)__UNCONST(wildabbr), 216 (__aconst char *)__UNCONST(wildabbr) 217 }; 218 219 #else 220 221 extern __aconst char * tzname[2]; 222 223 #endif 224 225 #ifdef _REENTRANT 226 static rwlock_t lcl_lock = RWLOCK_INITIALIZER; 227 #endif 228 229 /* 230 ** Section 4.12.3 of X3.159-1989 requires that 231 ** Except for the strftime function, these functions [asctime, 232 ** ctime, gmtime, localtime] return values in one of two static 233 ** objects: a broken-down time structure and an array of char. 234 ** Thanks to Paul Eggert for noting this. 235 */ 236 237 static struct tm tm; 238 239 #ifdef USG_COMPAT 240 #if !defined(__LIBC12_SOURCE__) 241 long timezone = 0; 242 int daylight = 0; 243 #else 244 extern int daylight; 245 extern long timezone __RENAME(__timezone13); 246 #endif 247 #endif /* defined USG_COMPAT */ 248 249 #ifdef ALTZONE 250 time_t altzone = 0; 251 #endif /* defined ALTZONE */ 252 253 static long 254 detzcode(const char *const codep) 255 { 256 long result; 257 int i; 258 259 result = (codep[0] & 0x80) ? ~0L : 0; 260 for (i = 0; i < 4; ++i) 261 result = (result << 8) | (codep[i] & 0xff); 262 return result; 263 } 264 265 static time_t 266 detzcode64(const char *const codep) 267 { 268 time_t result; 269 int i; 270 271 result = (codep[0] & 0x80) ? -1 : 0; 272 for (i = 0; i < 8; ++i) 273 result = result * 256 + (codep[i] & 0xff); 274 return result; 275 } 276 277 const char * 278 tzgetname(const timezone_t sp, int isdst) 279 { 280 int i; 281 for (i = 0; i < sp->timecnt; ++i) { 282 const struct ttinfo *const ttisp = &sp->ttis[sp->types[i]]; 283 284 if (ttisp->tt_isdst == isdst) 285 return &sp->chars[ttisp->tt_abbrind]; 286 } 287 return NULL; 288 } 289 290 static void 291 settzname_z(timezone_t sp) 292 { 293 int i; 294 295 /* 296 ** Scrub the abbreviations. 297 ** First, replace bogus characters. 298 */ 299 for (i = 0; i < sp->charcnt; ++i) 300 if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL) 301 sp->chars[i] = TZ_ABBR_ERR_CHAR; 302 /* 303 ** Second, truncate long abbreviations. 304 */ 305 for (i = 0; i < sp->typecnt; ++i) { 306 const struct ttinfo * const ttisp = &sp->ttis[i]; 307 char * cp = &sp->chars[ttisp->tt_abbrind]; 308 309 if (strlen(cp) > TZ_ABBR_MAX_LEN && 310 strcmp(cp, GRANDPARENTED) != 0) 311 *(cp + TZ_ABBR_MAX_LEN) = '\0'; 312 } 313 } 314 315 static void 316 settzname(void) 317 { 318 timezone_t const sp = lclptr; 319 int i; 320 321 tzname[0] = (__aconst char *)__UNCONST(wildabbr); 322 tzname[1] = (__aconst char *)__UNCONST(wildabbr); 323 #ifdef USG_COMPAT 324 daylight = 0; 325 timezone = 0; 326 #endif /* defined USG_COMPAT */ 327 #ifdef ALTZONE 328 altzone = 0; 329 #endif /* defined ALTZONE */ 330 if (sp == NULL) { 331 tzname[0] = tzname[1] = (__aconst char *)__UNCONST(gmt); 332 return; 333 } 334 /* 335 ** And to get the latest zone names into tzname. . . 336 */ 337 for (i = 0; i < sp->typecnt; ++i) { 338 const struct ttinfo * const ttisp = &sp->ttis[i]; 339 340 tzname[ttisp->tt_isdst] = 341 &sp->chars[ttisp->tt_abbrind]; 342 #ifdef USG_COMPAT 343 if (ttisp->tt_isdst) 344 daylight = 1; 345 if (!ttisp->tt_isdst) 346 timezone = -(ttisp->tt_gmtoff); 347 #endif /* defined USG_COMPAT */ 348 #ifdef ALTZONE 349 if (i == 0 || ttisp->tt_isdst) 350 altzone = -(ttisp->tt_gmtoff); 351 #endif /* defined ALTZONE */ 352 } 353 settzname_z(sp); 354 } 355 356 static int 357 differ_by_repeat(const time_t t1, const time_t t0) 358 { 359 /* CONSTCOND */ 360 if (TYPE_INTEGRAL(time_t) && 361 TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS) 362 return 0; 363 return (int_fast64_t)t1 - (int_fast64_t)t0 == SECSPERREPEAT; 364 } 365 366 static int 367 tzload(timezone_t sp, const char *name, const int doextend) 368 { 369 const char * p; 370 int i; 371 int fid; 372 int stored; 373 ssize_t nread; 374 typedef union { 375 struct tzhead tzhead; 376 char buf[2 * sizeof(struct tzhead) + 377 2 * sizeof *sp + 378 4 * TZ_MAX_TIMES]; 379 } u_t; 380 u_t * up; 381 382 up = calloc(1, sizeof *up); 383 if (up == NULL) 384 return -1; 385 386 sp->goback = sp->goahead = FALSE; 387 if (name == NULL && (name = TZDEFAULT) == NULL) 388 goto oops; 389 { 390 int doaccess; 391 /* 392 ** Section 4.9.1 of the C standard says that 393 ** "FILENAME_MAX expands to an integral constant expression 394 ** that is the size needed for an array of char large enough 395 ** to hold the longest file name string that the implementation 396 ** guarantees can be opened." 397 */ 398 char fullname[FILENAME_MAX + 1]; 399 400 if (name[0] == ':') 401 ++name; 402 doaccess = name[0] == '/'; 403 if (!doaccess) { 404 if ((p = TZDIR) == NULL) 405 goto oops; 406 if ((strlen(p) + strlen(name) + 1) >= sizeof fullname) 407 goto oops; 408 (void) strcpy(fullname, p); /* XXX strcpy is safe */ 409 (void) strcat(fullname, "/"); /* XXX strcat is safe */ 410 (void) strcat(fullname, name); /* XXX strcat is safe */ 411 /* 412 ** Set doaccess if '.' (as in "../") shows up in name. 413 */ 414 if (strchr(name, '.') != NULL) 415 doaccess = TRUE; 416 name = fullname; 417 } 418 if (doaccess && access(name, R_OK) != 0) 419 goto oops; 420 /* 421 * XXX potential security problem here if user of a set-id 422 * program has set TZ (which is passed in as name) here, 423 * and uses a race condition trick to defeat the access(2) 424 * above. 425 */ 426 if ((fid = open(name, OPEN_MODE)) == -1) 427 goto oops; 428 } 429 nread = read(fid, up->buf, sizeof up->buf); 430 if (close(fid) < 0 || nread <= 0) 431 goto oops; 432 for (stored = 4; stored <= 8; stored *= 2) { 433 int ttisstdcnt; 434 int ttisgmtcnt; 435 436 ttisstdcnt = (int) detzcode(up->tzhead.tzh_ttisstdcnt); 437 ttisgmtcnt = (int) detzcode(up->tzhead.tzh_ttisgmtcnt); 438 sp->leapcnt = (int) detzcode(up->tzhead.tzh_leapcnt); 439 sp->timecnt = (int) detzcode(up->tzhead.tzh_timecnt); 440 sp->typecnt = (int) detzcode(up->tzhead.tzh_typecnt); 441 sp->charcnt = (int) detzcode(up->tzhead.tzh_charcnt); 442 p = up->tzhead.tzh_charcnt + sizeof up->tzhead.tzh_charcnt; 443 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS || 444 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES || 445 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES || 446 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS || 447 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) || 448 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0)) 449 goto oops; 450 if (nread - (p - up->buf) < 451 sp->timecnt * stored + /* ats */ 452 sp->timecnt + /* types */ 453 sp->typecnt * 6 + /* ttinfos */ 454 sp->charcnt + /* chars */ 455 sp->leapcnt * (stored + 4) + /* lsinfos */ 456 ttisstdcnt + /* ttisstds */ 457 ttisgmtcnt) /* ttisgmts */ 458 goto oops; 459 for (i = 0; i < sp->timecnt; ++i) { 460 sp->ats[i] = (time_t)((stored == 4) ? 461 detzcode(p) : detzcode64(p)); 462 p += stored; 463 } 464 for (i = 0; i < sp->timecnt; ++i) { 465 sp->types[i] = (unsigned char) *p++; 466 if (sp->types[i] >= sp->typecnt) 467 goto oops; 468 } 469 for (i = 0; i < sp->typecnt; ++i) { 470 struct ttinfo * ttisp; 471 472 ttisp = &sp->ttis[i]; 473 ttisp->tt_gmtoff = detzcode(p); 474 p += 4; 475 ttisp->tt_isdst = (unsigned char) *p++; 476 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1) 477 goto oops; 478 ttisp->tt_abbrind = (unsigned char) *p++; 479 if (ttisp->tt_abbrind < 0 || 480 ttisp->tt_abbrind > sp->charcnt) 481 goto oops; 482 } 483 for (i = 0; i < sp->charcnt; ++i) 484 sp->chars[i] = *p++; 485 sp->chars[i] = '\0'; /* ensure '\0' at end */ 486 for (i = 0; i < sp->leapcnt; ++i) { 487 struct lsinfo * lsisp; 488 489 lsisp = &sp->lsis[i]; 490 lsisp->ls_trans = (time_t)((stored == 4) ? 491 detzcode(p) : detzcode64(p)); 492 p += stored; 493 lsisp->ls_corr = detzcode(p); 494 p += 4; 495 } 496 for (i = 0; i < sp->typecnt; ++i) { 497 struct ttinfo * ttisp; 498 499 ttisp = &sp->ttis[i]; 500 if (ttisstdcnt == 0) 501 ttisp->tt_ttisstd = FALSE; 502 else { 503 ttisp->tt_ttisstd = *p++; 504 if (ttisp->tt_ttisstd != TRUE && 505 ttisp->tt_ttisstd != FALSE) 506 goto oops; 507 } 508 } 509 for (i = 0; i < sp->typecnt; ++i) { 510 struct ttinfo * ttisp; 511 512 ttisp = &sp->ttis[i]; 513 if (ttisgmtcnt == 0) 514 ttisp->tt_ttisgmt = FALSE; 515 else { 516 ttisp->tt_ttisgmt = *p++; 517 if (ttisp->tt_ttisgmt != TRUE && 518 ttisp->tt_ttisgmt != FALSE) 519 goto oops; 520 } 521 } 522 /* 523 ** Out-of-sort ats should mean we're running on a 524 ** signed time_t system but using a data file with 525 ** unsigned values (or vice versa). 526 */ 527 for (i = 0; i < sp->timecnt - 2; ++i) 528 if (sp->ats[i] > sp->ats[i + 1]) { 529 ++i; 530 /* CONSTCOND */ 531 if (TYPE_SIGNED(time_t)) { 532 /* 533 ** Ignore the end (easy). 534 */ 535 sp->timecnt = i; 536 } else { 537 /* 538 ** Ignore the beginning (harder). 539 */ 540 int j; 541 542 for (j = 0; j + i < sp->timecnt; ++j) { 543 sp->ats[j] = sp->ats[j + i]; 544 sp->types[j] = sp->types[j + i]; 545 } 546 sp->timecnt = j; 547 } 548 break; 549 } 550 /* 551 ** If this is an old file, we're done. 552 */ 553 if (up->tzhead.tzh_version[0] == '\0') 554 break; 555 nread -= p - up->buf; 556 for (i = 0; i < nread; ++i) 557 up->buf[i] = p[i]; 558 /* 559 ** If this is a narrow integer time_t system, we're done. 560 */ 561 if (stored >= (int) sizeof(time_t) 562 /* CONSTCOND */ 563 && TYPE_INTEGRAL(time_t)) 564 break; 565 } 566 if (doextend && nread > 2 && 567 up->buf[0] == '\n' && up->buf[nread - 1] == '\n' && 568 sp->typecnt + 2 <= TZ_MAX_TYPES) { 569 struct __state ts; 570 int result; 571 572 up->buf[nread - 1] = '\0'; 573 result = tzparse(&ts, &up->buf[1], FALSE); 574 if (result == 0 && ts.typecnt == 2 && 575 sp->charcnt + ts.charcnt <= TZ_MAX_CHARS) { 576 for (i = 0; i < 2; ++i) 577 ts.ttis[i].tt_abbrind += 578 sp->charcnt; 579 for (i = 0; i < ts.charcnt; ++i) 580 sp->chars[sp->charcnt++] = 581 ts.chars[i]; 582 i = 0; 583 while (i < ts.timecnt && 584 ts.ats[i] <= 585 sp->ats[sp->timecnt - 1]) 586 ++i; 587 while (i < ts.timecnt && 588 sp->timecnt < TZ_MAX_TIMES) { 589 sp->ats[sp->timecnt] = 590 ts.ats[i]; 591 sp->types[sp->timecnt] = 592 sp->typecnt + 593 ts.types[i]; 594 ++sp->timecnt; 595 ++i; 596 } 597 sp->ttis[sp->typecnt++] = ts.ttis[0]; 598 sp->ttis[sp->typecnt++] = ts.ttis[1]; 599 } 600 } 601 if (sp->timecnt > 1) { 602 for (i = 1; i < sp->timecnt; ++i) 603 if (typesequiv(sp, sp->types[i], sp->types[0]) && 604 differ_by_repeat(sp->ats[i], sp->ats[0])) { 605 sp->goback = TRUE; 606 break; 607 } 608 for (i = sp->timecnt - 2; i >= 0; --i) 609 if (typesequiv(sp, sp->types[sp->timecnt - 1], 610 sp->types[i]) && 611 differ_by_repeat(sp->ats[sp->timecnt - 1], 612 sp->ats[i])) { 613 sp->goahead = TRUE; 614 break; 615 } 616 } 617 free(up); 618 return 0; 619 oops: 620 free(up); 621 return -1; 622 } 623 624 static int 625 typesequiv(const timezone_t sp, const int a, const int b) 626 { 627 int result; 628 629 if (sp == NULL || 630 a < 0 || a >= sp->typecnt || 631 b < 0 || b >= sp->typecnt) 632 result = FALSE; 633 else { 634 const struct ttinfo * ap = &sp->ttis[a]; 635 const struct ttinfo * bp = &sp->ttis[b]; 636 result = ap->tt_gmtoff == bp->tt_gmtoff && 637 ap->tt_isdst == bp->tt_isdst && 638 ap->tt_ttisstd == bp->tt_ttisstd && 639 ap->tt_ttisgmt == bp->tt_ttisgmt && 640 strcmp(&sp->chars[ap->tt_abbrind], 641 &sp->chars[bp->tt_abbrind]) == 0; 642 } 643 return result; 644 } 645 646 static const int mon_lengths[2][MONSPERYEAR] = { 647 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 648 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } 649 }; 650 651 static const int year_lengths[2] = { 652 DAYSPERNYEAR, DAYSPERLYEAR 653 }; 654 655 /* 656 ** Given a pointer into a time zone string, scan until a character that is not 657 ** a valid character in a zone name is found. Return a pointer to that 658 ** character. 659 */ 660 661 static const char * 662 getzname(const char *strp) 663 { 664 char c; 665 666 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && 667 c != '+') 668 ++strp; 669 return strp; 670 } 671 672 /* 673 ** Given a pointer into an extended time zone string, scan until the ending 674 ** delimiter of the zone name is located. Return a pointer to the delimiter. 675 ** 676 ** As with getzname above, the legal character set is actually quite 677 ** restricted, with other characters producing undefined results. 678 ** We don't do any checking here; checking is done later in common-case code. 679 */ 680 681 static const char * 682 getqzname(const char *strp, const int delim) 683 { 684 int c; 685 686 while ((c = *strp) != '\0' && c != delim) 687 ++strp; 688 return strp; 689 } 690 691 /* 692 ** Given a pointer into a time zone string, extract a number from that string. 693 ** Check that the number is within a specified range; if it is not, return 694 ** NULL. 695 ** Otherwise, return a pointer to the first character not part of the number. 696 */ 697 698 static const char * 699 getnum(const char *strp, int * const nump, const int min, const int max) 700 { 701 char c; 702 int num; 703 704 if (strp == NULL || !is_digit(c = *strp)) { 705 errno = EINVAL; 706 return NULL; 707 } 708 num = 0; 709 do { 710 num = num * 10 + (c - '0'); 711 if (num > max) { 712 errno = EOVERFLOW; 713 return NULL; /* illegal value */ 714 } 715 c = *++strp; 716 } while (is_digit(c)); 717 if (num < min) { 718 errno = EINVAL; 719 return NULL; /* illegal value */ 720 } 721 *nump = num; 722 return strp; 723 } 724 725 /* 726 ** Given a pointer into a time zone string, extract a number of seconds, 727 ** in hh[:mm[:ss]] form, from the string. 728 ** If any error occurs, return NULL. 729 ** Otherwise, return a pointer to the first character not part of the number 730 ** of seconds. 731 */ 732 733 static const char * 734 getsecs(const char *strp, long *const secsp) 735 { 736 int num; 737 738 /* 739 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like 740 ** "M10.4.6/26", which does not conform to Posix, 741 ** but which specifies the equivalent of 742 ** ``02:00 on the first Sunday on or after 23 Oct''. 743 */ 744 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); 745 if (strp == NULL) 746 return NULL; 747 *secsp = num * (long) SECSPERHOUR; 748 if (*strp == ':') { 749 ++strp; 750 strp = getnum(strp, &num, 0, MINSPERHOUR - 1); 751 if (strp == NULL) 752 return NULL; 753 *secsp += num * SECSPERMIN; 754 if (*strp == ':') { 755 ++strp; 756 /* `SECSPERMIN' allows for leap seconds. */ 757 strp = getnum(strp, &num, 0, SECSPERMIN); 758 if (strp == NULL) 759 return NULL; 760 *secsp += num; 761 } 762 } 763 return strp; 764 } 765 766 /* 767 ** Given a pointer into a time zone string, extract an offset, in 768 ** [+-]hh[:mm[:ss]] form, from the string. 769 ** If any error occurs, return NULL. 770 ** Otherwise, return a pointer to the first character not part of the time. 771 */ 772 773 static const char * 774 getoffset(const char *strp, long *const offsetp) 775 { 776 int neg = 0; 777 778 if (*strp == '-') { 779 neg = 1; 780 ++strp; 781 } else if (*strp == '+') 782 ++strp; 783 strp = getsecs(strp, offsetp); 784 if (strp == NULL) 785 return NULL; /* illegal time */ 786 if (neg) 787 *offsetp = -*offsetp; 788 return strp; 789 } 790 791 /* 792 ** Given a pointer into a time zone string, extract a rule in the form 793 ** date[/time]. See POSIX section 8 for the format of "date" and "time". 794 ** If a valid rule is not found, return NULL. 795 ** Otherwise, return a pointer to the first character not part of the rule. 796 */ 797 798 static const char * 799 getrule(const char *strp, struct rule *const rulep) 800 { 801 if (*strp == 'J') { 802 /* 803 ** Julian day. 804 */ 805 rulep->r_type = JULIAN_DAY; 806 ++strp; 807 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); 808 } else if (*strp == 'M') { 809 /* 810 ** Month, week, day. 811 */ 812 rulep->r_type = MONTH_NTH_DAY_OF_WEEK; 813 ++strp; 814 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); 815 if (strp == NULL) 816 return NULL; 817 if (*strp++ != '.') 818 return NULL; 819 strp = getnum(strp, &rulep->r_week, 1, 5); 820 if (strp == NULL) 821 return NULL; 822 if (*strp++ != '.') 823 return NULL; 824 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); 825 } else if (is_digit(*strp)) { 826 /* 827 ** Day of year. 828 */ 829 rulep->r_type = DAY_OF_YEAR; 830 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); 831 } else return NULL; /* invalid format */ 832 if (strp == NULL) 833 return NULL; 834 if (*strp == '/') { 835 /* 836 ** Time specified. 837 */ 838 ++strp; 839 strp = getsecs(strp, &rulep->r_time); 840 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ 841 return strp; 842 } 843 844 /* 845 ** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the 846 ** year, a rule, and the offset from UTC at the time that rule takes effect, 847 ** calculate the Epoch-relative time that rule takes effect. 848 */ 849 850 static time_t 851 transtime(const time_t janfirst, const int year, const struct rule *const rulep, 852 const long offset) 853 { 854 int leapyear; 855 time_t value; 856 int i; 857 int d, m1, yy0, yy1, yy2, dow; 858 859 INITIALIZE(value); 860 leapyear = isleap(year); 861 switch (rulep->r_type) { 862 863 case JULIAN_DAY: 864 /* 865 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap 866 ** years. 867 ** In non-leap years, or if the day number is 59 or less, just 868 ** add SECSPERDAY times the day number-1 to the time of 869 ** January 1, midnight, to get the day. 870 */ 871 value = (time_t)(janfirst + (rulep->r_day - 1) * SECSPERDAY); 872 if (leapyear && rulep->r_day >= 60) 873 value += SECSPERDAY; 874 break; 875 876 case DAY_OF_YEAR: 877 /* 878 ** n - day of year. 879 ** Just add SECSPERDAY times the day number to the time of 880 ** January 1, midnight, to get the day. 881 */ 882 value = (time_t)(janfirst + rulep->r_day * SECSPERDAY); 883 break; 884 885 case MONTH_NTH_DAY_OF_WEEK: 886 /* 887 ** Mm.n.d - nth "dth day" of month m. 888 */ 889 value = janfirst; 890 for (i = 0; i < rulep->r_mon - 1; ++i) 891 value += (time_t)(mon_lengths[leapyear][i] * SECSPERDAY); 892 893 /* 894 ** Use Zeller's Congruence to get day-of-week of first day of 895 ** month. 896 */ 897 m1 = (rulep->r_mon + 9) % 12 + 1; 898 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; 899 yy1 = yy0 / 100; 900 yy2 = yy0 % 100; 901 dow = ((26 * m1 - 2) / 10 + 902 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; 903 if (dow < 0) 904 dow += DAYSPERWEEK; 905 906 /* 907 ** "dow" is the day-of-week of the first day of the month. Get 908 ** the day-of-month (zero-origin) of the first "dow" day of the 909 ** month. 910 */ 911 d = rulep->r_day - dow; 912 if (d < 0) 913 d += DAYSPERWEEK; 914 for (i = 1; i < rulep->r_week; ++i) { 915 if (d + DAYSPERWEEK >= 916 mon_lengths[leapyear][rulep->r_mon - 1]) 917 break; 918 d += DAYSPERWEEK; 919 } 920 921 /* 922 ** "d" is the day-of-month (zero-origin) of the day we want. 923 */ 924 value += (time_t)(d * SECSPERDAY); 925 break; 926 } 927 928 /* 929 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in 930 ** question. To get the Epoch-relative time of the specified local 931 ** time on that day, add the transition time and the current offset 932 ** from UTC. 933 */ 934 return (time_t)(value + rulep->r_time + offset); 935 } 936 937 /* 938 ** Given a POSIX section 8-style TZ string, fill in the rule tables as 939 ** appropriate. 940 */ 941 942 static int 943 tzparse(timezone_t sp, const char *name, const int lastditch) 944 { 945 const char * stdname; 946 const char * dstname; 947 size_t stdlen; 948 size_t dstlen; 949 long stdoffset; 950 long dstoffset; 951 time_t * atp; 952 unsigned char * typep; 953 char * cp; 954 int load_result; 955 956 INITIALIZE(dstname); 957 stdname = name; 958 if (lastditch) { 959 stdlen = strlen(name); /* length of standard zone name */ 960 name += stdlen; 961 if (stdlen >= sizeof sp->chars) 962 stdlen = (sizeof sp->chars) - 1; 963 stdoffset = 0; 964 } else { 965 if (*name == '<') { 966 name++; 967 stdname = name; 968 name = getqzname(name, '>'); 969 if (*name != '>') 970 return (-1); 971 stdlen = name - stdname; 972 name++; 973 } else { 974 name = getzname(name); 975 stdlen = name - stdname; 976 } 977 if (*name == '\0') 978 return -1; 979 name = getoffset(name, &stdoffset); 980 if (name == NULL) 981 return -1; 982 } 983 load_result = tzload(sp, TZDEFRULES, FALSE); 984 if (load_result != 0) 985 sp->leapcnt = 0; /* so, we're off a little */ 986 if (*name != '\0') { 987 if (*name == '<') { 988 dstname = ++name; 989 name = getqzname(name, '>'); 990 if (*name != '>') 991 return -1; 992 dstlen = name - dstname; 993 name++; 994 } else { 995 dstname = name; 996 name = getzname(name); 997 dstlen = name - dstname; /* length of DST zone name */ 998 } 999 if (*name != '\0' && *name != ',' && *name != ';') { 1000 name = getoffset(name, &dstoffset); 1001 if (name == NULL) 1002 return -1; 1003 } else dstoffset = stdoffset - SECSPERHOUR; 1004 if (*name == '\0' && load_result != 0) 1005 name = TZDEFRULESTRING; 1006 if (*name == ',' || *name == ';') { 1007 struct rule start; 1008 struct rule end; 1009 int year; 1010 time_t janfirst; 1011 time_t starttime; 1012 time_t endtime; 1013 1014 ++name; 1015 if ((name = getrule(name, &start)) == NULL) 1016 return -1; 1017 if (*name++ != ',') 1018 return -1; 1019 if ((name = getrule(name, &end)) == NULL) 1020 return -1; 1021 if (*name != '\0') 1022 return -1; 1023 sp->typecnt = 2; /* standard time and DST */ 1024 /* 1025 ** Two transitions per year, from EPOCH_YEAR forward. 1026 */ 1027 memset(sp->ttis, 0, sizeof(sp->ttis)); 1028 sp->ttis[0].tt_gmtoff = -dstoffset; 1029 sp->ttis[0].tt_isdst = 1; 1030 sp->ttis[0].tt_abbrind = (int)(stdlen + 1); 1031 sp->ttis[1].tt_gmtoff = -stdoffset; 1032 sp->ttis[1].tt_isdst = 0; 1033 sp->ttis[1].tt_abbrind = 0; 1034 atp = sp->ats; 1035 typep = sp->types; 1036 janfirst = 0; 1037 sp->timecnt = 0; 1038 for (year = EPOCH_YEAR; 1039 sp->timecnt + 2 <= TZ_MAX_TIMES; 1040 ++year) { 1041 time_t newfirst; 1042 1043 starttime = transtime(janfirst, year, &start, 1044 stdoffset); 1045 endtime = transtime(janfirst, year, &end, 1046 dstoffset); 1047 if (starttime > endtime) { 1048 *atp++ = endtime; 1049 *typep++ = 1; /* DST ends */ 1050 *atp++ = starttime; 1051 *typep++ = 0; /* DST begins */ 1052 } else { 1053 *atp++ = starttime; 1054 *typep++ = 0; /* DST begins */ 1055 *atp++ = endtime; 1056 *typep++ = 1; /* DST ends */ 1057 } 1058 sp->timecnt += 2; 1059 newfirst = janfirst; 1060 newfirst += (time_t) 1061 (year_lengths[isleap(year)] * SECSPERDAY); 1062 if (newfirst <= janfirst) 1063 break; 1064 janfirst = newfirst; 1065 } 1066 } else { 1067 long theirstdoffset; 1068 long theirdstoffset; 1069 long theiroffset; 1070 int isdst; 1071 int i; 1072 int j; 1073 1074 if (*name != '\0') 1075 return -1; 1076 /* 1077 ** Initial values of theirstdoffset 1078 */ 1079 theirstdoffset = 0; 1080 for (i = 0; i < sp->timecnt; ++i) { 1081 j = sp->types[i]; 1082 if (!sp->ttis[j].tt_isdst) { 1083 theirstdoffset = 1084 -sp->ttis[j].tt_gmtoff; 1085 break; 1086 } 1087 } 1088 theirdstoffset = 0; 1089 for (i = 0; i < sp->timecnt; ++i) { 1090 j = sp->types[i]; 1091 if (sp->ttis[j].tt_isdst) { 1092 theirdstoffset = 1093 -sp->ttis[j].tt_gmtoff; 1094 break; 1095 } 1096 } 1097 /* 1098 ** Initially we're assumed to be in standard time. 1099 */ 1100 isdst = FALSE; 1101 theiroffset = theirstdoffset; 1102 /* 1103 ** Now juggle transition times and types 1104 ** tracking offsets as you do. 1105 */ 1106 for (i = 0; i < sp->timecnt; ++i) { 1107 j = sp->types[i]; 1108 sp->types[i] = sp->ttis[j].tt_isdst; 1109 if (sp->ttis[j].tt_ttisgmt) { 1110 /* No adjustment to transition time */ 1111 } else { 1112 /* 1113 ** If summer time is in effect, and the 1114 ** transition time was not specified as 1115 ** standard time, add the summer time 1116 ** offset to the transition time; 1117 ** otherwise, add the standard time 1118 ** offset to the transition time. 1119 */ 1120 /* 1121 ** Transitions from DST to DDST 1122 ** will effectively disappear since 1123 ** POSIX provides for only one DST 1124 ** offset. 1125 */ 1126 if (isdst && !sp->ttis[j].tt_ttisstd) { 1127 sp->ats[i] += (time_t) 1128 (dstoffset - theirdstoffset); 1129 } else { 1130 sp->ats[i] += (time_t) 1131 (stdoffset - theirstdoffset); 1132 } 1133 } 1134 theiroffset = -sp->ttis[j].tt_gmtoff; 1135 if (!sp->ttis[j].tt_isdst) 1136 theirstdoffset = theiroffset; 1137 else theirdstoffset = theiroffset; 1138 } 1139 /* 1140 ** Finally, fill in ttis. 1141 */ 1142 memset(sp->ttis, 0, sizeof(sp->ttis)); 1143 sp->ttis[0].tt_gmtoff = -stdoffset; 1144 sp->ttis[0].tt_isdst = FALSE; 1145 sp->ttis[0].tt_abbrind = 0; 1146 sp->ttis[1].tt_gmtoff = -dstoffset; 1147 sp->ttis[1].tt_isdst = TRUE; 1148 sp->ttis[1].tt_abbrind = (int)(stdlen + 1); 1149 sp->typecnt = 2; 1150 } 1151 } else { 1152 dstlen = 0; 1153 sp->typecnt = 1; /* only standard time */ 1154 sp->timecnt = 0; 1155 memset(sp->ttis, 0, sizeof(sp->ttis)); 1156 sp->ttis[0].tt_gmtoff = -stdoffset; 1157 sp->ttis[0].tt_isdst = 0; 1158 sp->ttis[0].tt_abbrind = 0; 1159 } 1160 sp->charcnt = (int)(stdlen + 1); 1161 if (dstlen != 0) 1162 sp->charcnt += (int)(dstlen + 1); 1163 if ((size_t) sp->charcnt > sizeof sp->chars) 1164 return -1; 1165 cp = sp->chars; 1166 (void) strncpy(cp, stdname, stdlen); 1167 cp += stdlen; 1168 *cp++ = '\0'; 1169 if (dstlen != 0) { 1170 (void) strncpy(cp, dstname, dstlen); 1171 *(cp + dstlen) = '\0'; 1172 } 1173 return 0; 1174 } 1175 1176 static void 1177 gmtload(timezone_t sp) 1178 { 1179 if (tzload(sp, gmt, TRUE) != 0) 1180 (void) tzparse(sp, gmt, TRUE); 1181 } 1182 1183 timezone_t 1184 tzalloc(const char *name) 1185 { 1186 timezone_t sp = calloc(1, sizeof *sp); 1187 if (sp == NULL) 1188 return NULL; 1189 if (tzload(sp, name, TRUE) != 0) { 1190 free(sp); 1191 return NULL; 1192 } 1193 settzname_z(sp); 1194 return sp; 1195 } 1196 1197 void 1198 tzfree(const timezone_t sp) 1199 { 1200 free(sp); 1201 } 1202 1203 static void 1204 tzsetwall_unlocked(void) 1205 { 1206 if (lcl_is_set < 0) 1207 return; 1208 lcl_is_set = -1; 1209 1210 if (lclptr == NULL) { 1211 int saveerrno = errno; 1212 lclptr = calloc(1, sizeof *lclptr); 1213 errno = saveerrno; 1214 if (lclptr == NULL) { 1215 settzname(); /* all we can do */ 1216 return; 1217 } 1218 } 1219 if (tzload(lclptr, NULL, TRUE) != 0) 1220 gmtload(lclptr); 1221 settzname(); 1222 } 1223 1224 #ifndef STD_INSPIRED 1225 /* 1226 ** A non-static declaration of tzsetwall in a system header file 1227 ** may cause a warning about this upcoming static declaration... 1228 */ 1229 static 1230 #endif /* !defined STD_INSPIRED */ 1231 void 1232 tzsetwall(void) 1233 { 1234 rwlock_wrlock(&lcl_lock); 1235 tzsetwall_unlocked(); 1236 rwlock_unlock(&lcl_lock); 1237 } 1238 1239 #ifndef STD_INSPIRED 1240 /* 1241 ** A non-static declaration of tzsetwall in a system header file 1242 ** may cause a warning about this upcoming static declaration... 1243 */ 1244 static 1245 #endif /* !defined STD_INSPIRED */ 1246 void 1247 tzset_unlocked(void) 1248 { 1249 const char * name; 1250 int saveerrno; 1251 1252 saveerrno = errno; 1253 name = getenv("TZ"); 1254 errno = saveerrno; 1255 if (name == NULL) { 1256 tzsetwall_unlocked(); 1257 return; 1258 } 1259 1260 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) 1261 return; 1262 lcl_is_set = strlen(name) < sizeof lcl_TZname; 1263 if (lcl_is_set) 1264 (void)strlcpy(lcl_TZname, name, sizeof(lcl_TZname)); 1265 1266 if (lclptr == NULL) { 1267 saveerrno = errno; 1268 lclptr = calloc(1, sizeof *lclptr); 1269 errno = saveerrno; 1270 if (lclptr == NULL) { 1271 settzname(); /* all we can do */ 1272 return; 1273 } 1274 } 1275 if (*name == '\0') { 1276 /* 1277 ** User wants it fast rather than right. 1278 */ 1279 lclptr->leapcnt = 0; /* so, we're off a little */ 1280 lclptr->timecnt = 0; 1281 lclptr->typecnt = 0; 1282 lclptr->ttis[0].tt_isdst = 0; 1283 lclptr->ttis[0].tt_gmtoff = 0; 1284 lclptr->ttis[0].tt_abbrind = 0; 1285 (void) strlcpy(lclptr->chars, gmt, sizeof(lclptr->chars)); 1286 } else if (tzload(lclptr, name, TRUE) != 0) 1287 if (name[0] == ':' || tzparse(lclptr, name, FALSE) != 0) 1288 (void) gmtload(lclptr); 1289 settzname(); 1290 } 1291 1292 void 1293 tzset(void) 1294 { 1295 rwlock_wrlock(&lcl_lock); 1296 tzset_unlocked(); 1297 rwlock_unlock(&lcl_lock); 1298 } 1299 1300 /* 1301 ** The easy way to behave "as if no library function calls" localtime 1302 ** is to not call it--so we drop its guts into "localsub", which can be 1303 ** freely called. (And no, the PANS doesn't require the above behavior-- 1304 ** but it *is* desirable.) 1305 ** 1306 ** The unused offset argument is for the benefit of mktime variants. 1307 */ 1308 1309 /*ARGSUSED*/ 1310 static struct tm * 1311 localsub(const timezone_t sp, const time_t * const timep, const long offset, 1312 struct tm *const tmp) 1313 { 1314 const struct ttinfo * ttisp; 1315 int i; 1316 struct tm * result; 1317 const time_t t = *timep; 1318 1319 if ((sp->goback && t < sp->ats[0]) || 1320 (sp->goahead && t > sp->ats[sp->timecnt - 1])) { 1321 time_t newt = t; 1322 time_t seconds; 1323 time_t tcycles; 1324 int_fast64_t icycles; 1325 1326 if (t < sp->ats[0]) 1327 seconds = sp->ats[0] - t; 1328 else seconds = t - sp->ats[sp->timecnt - 1]; 1329 --seconds; 1330 tcycles = (time_t) 1331 (seconds / YEARSPERREPEAT / AVGSECSPERYEAR); 1332 ++tcycles; 1333 icycles = tcycles; 1334 if (tcycles - icycles >= 1 || icycles - tcycles >= 1) 1335 return NULL; 1336 seconds = (time_t) icycles; 1337 seconds *= YEARSPERREPEAT; 1338 seconds *= AVGSECSPERYEAR; 1339 if (t < sp->ats[0]) 1340 newt += seconds; 1341 else newt -= seconds; 1342 if (newt < sp->ats[0] || 1343 newt > sp->ats[sp->timecnt - 1]) 1344 return NULL; /* "cannot happen" */ 1345 result = localsub(sp, &newt, offset, tmp); 1346 if (result == tmp) { 1347 time_t newy; 1348 1349 newy = tmp->tm_year; 1350 if (t < sp->ats[0]) 1351 newy -= (time_t)icycles * YEARSPERREPEAT; 1352 else newy += (time_t)icycles * YEARSPERREPEAT; 1353 tmp->tm_year = (int)newy; 1354 if (tmp->tm_year != newy) 1355 return NULL; 1356 } 1357 return result; 1358 } 1359 if (sp->timecnt == 0 || t < sp->ats[0]) { 1360 i = 0; 1361 while (sp->ttis[i].tt_isdst) 1362 if (++i >= sp->typecnt) { 1363 i = 0; 1364 break; 1365 } 1366 } else { 1367 int lo = 1; 1368 int hi = sp->timecnt; 1369 1370 while (lo < hi) { 1371 int mid = (lo + hi) / 2; 1372 1373 if (t < sp->ats[mid]) 1374 hi = mid; 1375 else lo = mid + 1; 1376 } 1377 i = (int) sp->types[lo - 1]; 1378 } 1379 ttisp = &sp->ttis[i]; 1380 /* 1381 ** To get (wrong) behavior that's compatible with System V Release 2.0 1382 ** you'd replace the statement below with 1383 ** t += ttisp->tt_gmtoff; 1384 ** timesub(&t, 0L, sp, tmp); 1385 */ 1386 result = timesub(sp, &t, ttisp->tt_gmtoff, tmp); 1387 tmp->tm_isdst = ttisp->tt_isdst; 1388 if (sp == lclptr) 1389 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind]; 1390 #ifdef TM_ZONE 1391 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind]; 1392 #endif /* defined TM_ZONE */ 1393 return result; 1394 } 1395 1396 /* 1397 ** Re-entrant version of localtime. 1398 */ 1399 1400 struct tm * 1401 localtime_r(const time_t * __restrict timep, struct tm *tmp) 1402 { 1403 rwlock_rdlock(&lcl_lock); 1404 tzset_unlocked(); 1405 tmp = localtime_rz(lclptr, timep, tmp); 1406 rwlock_unlock(&lcl_lock); 1407 return tmp; 1408 } 1409 1410 struct tm * 1411 localtime(const time_t *const timep) 1412 { 1413 return localtime_r(timep, &tm); 1414 } 1415 1416 struct tm * 1417 localtime_rz(const timezone_t sp, const time_t * __restrict timep, struct tm *tmp) 1418 { 1419 if (sp == NULL) 1420 tmp = gmtsub(NULL, timep, 0L, tmp); 1421 else 1422 tmp = localsub(sp, timep, 0L, tmp); 1423 if (tmp == NULL) 1424 errno = EOVERFLOW; 1425 return tmp; 1426 } 1427 1428 /* 1429 ** gmtsub is to gmtime as localsub is to localtime. 1430 */ 1431 1432 static struct tm * 1433 gmtsub(const timezone_t sp, const time_t * const timep, const long offset, 1434 struct tm *const tmp) 1435 { 1436 struct tm * result; 1437 #ifdef _REENTRANT 1438 static mutex_t gmt_mutex = MUTEX_INITIALIZER; 1439 #endif 1440 1441 mutex_lock(&gmt_mutex); 1442 if (!gmt_is_set) { 1443 int saveerrno; 1444 gmt_is_set = TRUE; 1445 saveerrno = errno; 1446 gmtptr = calloc(1, sizeof *gmtptr); 1447 errno = saveerrno; 1448 if (gmtptr != NULL) 1449 gmtload(gmtptr); 1450 } 1451 mutex_unlock(&gmt_mutex); 1452 result = timesub(gmtptr, timep, offset, tmp); 1453 #ifdef TM_ZONE 1454 /* 1455 ** Could get fancy here and deliver something such as 1456 ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero, 1457 ** but this is no time for a treasure hunt. 1458 */ 1459 if (offset != 0) 1460 tmp->TM_ZONE = (__aconst char *)__UNCONST(wildabbr); 1461 else { 1462 if (gmtptr == NULL) 1463 tmp->TM_ZONE = (__aconst char *)__UNCONST(gmt); 1464 else tmp->TM_ZONE = gmtptr->chars; 1465 } 1466 #endif /* defined TM_ZONE */ 1467 return result; 1468 } 1469 1470 struct tm * 1471 gmtime(const time_t *const timep) 1472 { 1473 struct tm *tmp = gmtsub(NULL, timep, 0L, &tm); 1474 1475 if (tmp == NULL) 1476 errno = EOVERFLOW; 1477 1478 return tmp; 1479 } 1480 1481 /* 1482 ** Re-entrant version of gmtime. 1483 */ 1484 1485 struct tm * 1486 gmtime_r(const time_t * const timep, struct tm *tmp) 1487 { 1488 tmp = gmtsub(NULL, timep, 0L, tmp); 1489 1490 if (tmp == NULL) 1491 errno = EOVERFLOW; 1492 1493 return tmp; 1494 } 1495 1496 #ifdef STD_INSPIRED 1497 1498 struct tm * 1499 offtime(const time_t *const timep, long offset) 1500 { 1501 struct tm *tmp = gmtsub(NULL, timep, offset, &tm); 1502 1503 if (tmp == NULL) 1504 errno = EOVERFLOW; 1505 1506 return tmp; 1507 } 1508 1509 struct tm * 1510 offtime_r(const time_t *timep, long offset, struct tm *tmp) 1511 { 1512 tmp = gmtsub(NULL, timep, offset, tmp); 1513 1514 if (tmp == NULL) 1515 errno = EOVERFLOW; 1516 1517 return tmp; 1518 } 1519 1520 #endif /* defined STD_INSPIRED */ 1521 1522 /* 1523 ** Return the number of leap years through the end of the given year 1524 ** where, to make the math easy, the answer for year zero is defined as zero. 1525 */ 1526 1527 static int 1528 leaps_thru_end_of(const int y) 1529 { 1530 return (y >= 0) ? (y / 4 - y / 100 + y / 400) : 1531 -(leaps_thru_end_of(-(y + 1)) + 1); 1532 } 1533 1534 static struct tm * 1535 timesub(const timezone_t sp, const time_t *const timep, const long offset, 1536 struct tm *const tmp) 1537 { 1538 const struct lsinfo * lp; 1539 time_t tdays; 1540 int idays; /* unsigned would be so 2003 */ 1541 long rem; 1542 int y; 1543 const int * ip; 1544 long corr; 1545 int hit; 1546 int i; 1547 1548 corr = 0; 1549 hit = 0; 1550 i = (sp == NULL) ? 0 : sp->leapcnt; 1551 while (--i >= 0) { 1552 lp = &sp->lsis[i]; 1553 if (*timep >= lp->ls_trans) { 1554 if (*timep == lp->ls_trans) { 1555 hit = ((i == 0 && lp->ls_corr > 0) || 1556 lp->ls_corr > sp->lsis[i - 1].ls_corr); 1557 if (hit) 1558 while (i > 0 && 1559 sp->lsis[i].ls_trans == 1560 sp->lsis[i - 1].ls_trans + 1 && 1561 sp->lsis[i].ls_corr == 1562 sp->lsis[i - 1].ls_corr + 1) { 1563 ++hit; 1564 --i; 1565 } 1566 } 1567 corr = lp->ls_corr; 1568 break; 1569 } 1570 } 1571 y = EPOCH_YEAR; 1572 tdays = (time_t)(*timep / SECSPERDAY); 1573 rem = (long) (*timep - tdays * SECSPERDAY); 1574 while (tdays < 0 || tdays >= year_lengths[isleap(y)]) { 1575 int newy; 1576 time_t tdelta; 1577 int idelta; 1578 int leapdays; 1579 1580 tdelta = tdays / DAYSPERLYEAR; 1581 idelta = (int) tdelta; 1582 if (tdelta - idelta >= 1 || idelta - tdelta >= 1) 1583 return NULL; 1584 if (idelta == 0) 1585 idelta = (tdays < 0) ? -1 : 1; 1586 newy = y; 1587 if (increment_overflow(&newy, idelta)) 1588 return NULL; 1589 leapdays = leaps_thru_end_of(newy - 1) - 1590 leaps_thru_end_of(y - 1); 1591 tdays -= ((time_t) newy - y) * DAYSPERNYEAR; 1592 tdays -= leapdays; 1593 y = newy; 1594 } 1595 { 1596 long seconds; 1597 1598 seconds = tdays * SECSPERDAY + 0.5; 1599 tdays = (time_t)(seconds / SECSPERDAY); 1600 rem += (long) (seconds - tdays * SECSPERDAY); 1601 } 1602 /* 1603 ** Given the range, we can now fearlessly cast... 1604 */ 1605 idays = (int) tdays; 1606 rem += offset - corr; 1607 while (rem < 0) { 1608 rem += SECSPERDAY; 1609 --idays; 1610 } 1611 while (rem >= SECSPERDAY) { 1612 rem -= SECSPERDAY; 1613 ++idays; 1614 } 1615 while (idays < 0) { 1616 if (increment_overflow(&y, -1)) 1617 return NULL; 1618 idays += year_lengths[isleap(y)]; 1619 } 1620 while (idays >= year_lengths[isleap(y)]) { 1621 idays -= year_lengths[isleap(y)]; 1622 if (increment_overflow(&y, 1)) 1623 return NULL; 1624 } 1625 tmp->tm_year = y; 1626 if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE)) 1627 return NULL; 1628 tmp->tm_yday = idays; 1629 /* 1630 ** The "extra" mods below avoid overflow problems. 1631 */ 1632 tmp->tm_wday = EPOCH_WDAY + 1633 ((y - EPOCH_YEAR) % DAYSPERWEEK) * 1634 (DAYSPERNYEAR % DAYSPERWEEK) + 1635 leaps_thru_end_of(y - 1) - 1636 leaps_thru_end_of(EPOCH_YEAR - 1) + 1637 idays; 1638 tmp->tm_wday %= DAYSPERWEEK; 1639 if (tmp->tm_wday < 0) 1640 tmp->tm_wday += DAYSPERWEEK; 1641 tmp->tm_hour = (int) (rem / SECSPERHOUR); 1642 rem %= SECSPERHOUR; 1643 tmp->tm_min = (int) (rem / SECSPERMIN); 1644 /* 1645 ** A positive leap second requires a special 1646 ** representation. This uses "... ??:59:60" et seq. 1647 */ 1648 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; 1649 ip = mon_lengths[isleap(y)]; 1650 for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon)) 1651 idays -= ip[tmp->tm_mon]; 1652 tmp->tm_mday = (int) (idays + 1); 1653 tmp->tm_isdst = 0; 1654 #ifdef TM_GMTOFF 1655 tmp->TM_GMTOFF = offset; 1656 #endif /* defined TM_GMTOFF */ 1657 return tmp; 1658 } 1659 1660 char * 1661 ctime(const time_t *const timep) 1662 { 1663 /* 1664 ** Section 4.12.3.2 of X3.159-1989 requires that 1665 ** The ctime function converts the calendar time pointed to by timer 1666 ** to local time in the form of a string. It is equivalent to 1667 ** asctime(localtime(timer)) 1668 */ 1669 struct tm *rtm = localtime(timep); 1670 if (rtm == NULL) 1671 return NULL; 1672 return asctime(rtm); 1673 } 1674 1675 char * 1676 ctime_r(const time_t *const timep, char *buf) 1677 { 1678 struct tm mytm, *rtm; 1679 1680 rtm = localtime_r(timep, &mytm); 1681 if (rtm == NULL) 1682 return NULL; 1683 return asctime_r(rtm, buf); 1684 } 1685 1686 char * 1687 ctime_rz(const timezone_t sp, const time_t * timep, char *buf) 1688 { 1689 struct tm mytm, *rtm; 1690 1691 rtm = localtime_rz(sp, timep, &mytm); 1692 if (rtm == NULL) 1693 return NULL; 1694 return asctime_r(rtm, buf); 1695 } 1696 1697 /* 1698 ** Adapted from code provided by Robert Elz, who writes: 1699 ** The "best" way to do mktime I think is based on an idea of Bob 1700 ** Kridle's (so its said...) from a long time ago. 1701 ** It does a binary search of the time_t space. Since time_t's are 1702 ** just 32 bits, its a max of 32 iterations (even at 64 bits it 1703 ** would still be very reasonable). 1704 */ 1705 1706 #ifndef WRONG 1707 #define WRONG ((time_t)-1) 1708 #endif /* !defined WRONG */ 1709 1710 /* 1711 ** Simplified normalize logic courtesy Paul Eggert. 1712 */ 1713 1714 static int 1715 increment_overflow(int *ip, int j) 1716 { 1717 int i = *ip; 1718 1719 /* 1720 ** If i >= 0 there can only be overflow if i + j > INT_MAX 1721 ** or if j > INT_MAX - i; given i >= 0, INT_MAX - i cannot overflow. 1722 ** If i < 0 there can only be overflow if i + j < INT_MIN 1723 ** or if j < INT_MIN - i; given i < 0, INT_MIN - i cannot overflow. 1724 */ 1725 if ((i >= 0) ? (j > INT_MAX - i) : (j < INT_MIN - i)) 1726 return TRUE; 1727 *ip += j; 1728 return FALSE; 1729 } 1730 1731 static int 1732 long_increment_overflow(long *lp, int m) 1733 { 1734 long l = *lp; 1735 1736 if ((l >= 0) ? (m > LONG_MAX - l) : (m < LONG_MIN - l)) 1737 return TRUE; 1738 *lp += m; 1739 return FALSE; 1740 } 1741 1742 static int 1743 normalize_overflow(int *const tensptr, int *const unitsptr, const int base) 1744 { 1745 int tensdelta; 1746 1747 tensdelta = (*unitsptr >= 0) ? 1748 (*unitsptr / base) : 1749 (-1 - (-1 - *unitsptr) / base); 1750 *unitsptr -= tensdelta * base; 1751 return increment_overflow(tensptr, tensdelta); 1752 } 1753 1754 static int 1755 long_normalize_overflow(long *const tensptr, int *const unitsptr, 1756 const int base) 1757 { 1758 int tensdelta; 1759 1760 tensdelta = (*unitsptr >= 0) ? 1761 (*unitsptr / base) : 1762 (-1 - (-1 - *unitsptr) / base); 1763 *unitsptr -= tensdelta * base; 1764 return long_increment_overflow(tensptr, tensdelta); 1765 } 1766 1767 static int 1768 tmcomp(const struct tm *const atmp, const struct tm *const btmp) 1769 { 1770 int result; 1771 1772 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 && 1773 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 && 1774 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && 1775 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && 1776 (result = (atmp->tm_min - btmp->tm_min)) == 0) 1777 result = atmp->tm_sec - btmp->tm_sec; 1778 return result; 1779 } 1780 1781 static time_t 1782 time2sub(const timezone_t sp, struct tm *const tmp, subfun_t funcp, 1783 const long offset, int *const okayp, const int do_norm_secs) 1784 { 1785 int dir; 1786 int i, j; 1787 int saved_seconds; 1788 long li; 1789 time_t lo; 1790 time_t hi; 1791 #ifdef NO_ERROR_IN_DST_GAP 1792 time_t ilo; 1793 #endif 1794 long y; 1795 time_t newt; 1796 time_t t; 1797 struct tm yourtm, mytm; 1798 1799 *okayp = FALSE; 1800 yourtm = *tmp; 1801 #ifdef NO_ERROR_IN_DST_GAP 1802 again: 1803 #endif 1804 if (do_norm_secs) { 1805 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec, 1806 SECSPERMIN)) 1807 goto overflow; 1808 } 1809 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) 1810 goto overflow; 1811 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) 1812 goto overflow; 1813 y = yourtm.tm_year; 1814 if (long_normalize_overflow(&y, &yourtm.tm_mon, MONSPERYEAR)) 1815 goto overflow; 1816 /* 1817 ** Turn y into an actual year number for now. 1818 ** It is converted back to an offset from TM_YEAR_BASE later. 1819 */ 1820 if (long_increment_overflow(&y, TM_YEAR_BASE)) 1821 goto overflow; 1822 while (yourtm.tm_mday <= 0) { 1823 if (long_increment_overflow(&y, -1)) 1824 goto overflow; 1825 li = y + (1 < yourtm.tm_mon); 1826 yourtm.tm_mday += year_lengths[isleap(li)]; 1827 } 1828 while (yourtm.tm_mday > DAYSPERLYEAR) { 1829 li = y + (1 < yourtm.tm_mon); 1830 yourtm.tm_mday -= year_lengths[isleap(li)]; 1831 if (long_increment_overflow(&y, 1)) 1832 goto overflow; 1833 } 1834 for ( ; ; ) { 1835 i = mon_lengths[isleap(y)][yourtm.tm_mon]; 1836 if (yourtm.tm_mday <= i) 1837 break; 1838 yourtm.tm_mday -= i; 1839 if (++yourtm.tm_mon >= MONSPERYEAR) { 1840 yourtm.tm_mon = 0; 1841 if (long_increment_overflow(&y, 1)) 1842 goto overflow; 1843 } 1844 } 1845 if (long_increment_overflow(&y, -TM_YEAR_BASE)) 1846 goto overflow; 1847 yourtm.tm_year = (int)y; 1848 if (yourtm.tm_year != y) 1849 goto overflow; 1850 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN) 1851 saved_seconds = 0; 1852 else if (y + TM_YEAR_BASE < EPOCH_YEAR) { 1853 /* 1854 ** We can't set tm_sec to 0, because that might push the 1855 ** time below the minimum representable time. 1856 ** Set tm_sec to 59 instead. 1857 ** This assumes that the minimum representable time is 1858 ** not in the same minute that a leap second was deleted from, 1859 ** which is a safer assumption than using 58 would be. 1860 */ 1861 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) 1862 goto overflow; 1863 saved_seconds = yourtm.tm_sec; 1864 yourtm.tm_sec = SECSPERMIN - 1; 1865 } else { 1866 saved_seconds = yourtm.tm_sec; 1867 yourtm.tm_sec = 0; 1868 } 1869 /* 1870 ** Do a binary search (this works whatever time_t's type is). 1871 */ 1872 /* LINTED constant */ 1873 if (!TYPE_SIGNED(time_t)) { 1874 lo = 0; 1875 hi = lo - 1; 1876 /* LINTED constant */ 1877 } else if (!TYPE_INTEGRAL(time_t)) { 1878 /* CONSTCOND */ 1879 if (sizeof(time_t) > sizeof(float)) 1880 /* LINTED assumed double */ 1881 hi = (time_t) DBL_MAX; 1882 /* LINTED assumed float */ 1883 else hi = (time_t) FLT_MAX; 1884 lo = -hi; 1885 } else { 1886 lo = 1; 1887 for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i) 1888 lo *= 2; 1889 hi = -(lo + 1); 1890 } 1891 #ifdef NO_ERROR_IN_DST_GAP 1892 ilo = lo; 1893 #endif 1894 for ( ; ; ) { 1895 t = lo / 2 + hi / 2; 1896 if (t < lo) 1897 t = lo; 1898 else if (t > hi) 1899 t = hi; 1900 if ((*funcp)(sp, &t, offset, &mytm) == NULL) { 1901 /* 1902 ** Assume that t is too extreme to be represented in 1903 ** a struct tm; arrange things so that it is less 1904 ** extreme on the next pass. 1905 */ 1906 dir = (t > 0) ? 1 : -1; 1907 } else dir = tmcomp(&mytm, &yourtm); 1908 if (dir != 0) { 1909 if (t == lo) { 1910 ++t; 1911 if (t <= lo) 1912 goto overflow; 1913 ++lo; 1914 } else if (t == hi) { 1915 --t; 1916 if (t >= hi) 1917 goto overflow; 1918 --hi; 1919 } 1920 #ifdef NO_ERROR_IN_DST_GAP 1921 if (ilo != lo && lo - 1 == hi && yourtm.tm_isdst < 0 && 1922 do_norm_secs) { 1923 for (i = sp->typecnt - 1; i >= 0; --i) { 1924 for (j = sp->typecnt - 1; j >= 0; --j) { 1925 time_t off; 1926 if (sp->ttis[j].tt_isdst == 1927 sp->ttis[i].tt_isdst) 1928 continue; 1929 off = sp->ttis[j].tt_gmtoff - 1930 sp->ttis[i].tt_gmtoff; 1931 yourtm.tm_sec += off < 0 ? 1932 -off : off; 1933 goto again; 1934 } 1935 } 1936 } 1937 #endif 1938 if (lo > hi) 1939 goto invalid; 1940 if (dir > 0) 1941 hi = t; 1942 else lo = t; 1943 continue; 1944 } 1945 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) 1946 break; 1947 /* 1948 ** Right time, wrong type. 1949 ** Hunt for right time, right type. 1950 ** It's okay to guess wrong since the guess 1951 ** gets checked. 1952 */ 1953 if (sp == NULL) 1954 goto invalid; 1955 for (i = sp->typecnt - 1; i >= 0; --i) { 1956 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) 1957 continue; 1958 for (j = sp->typecnt - 1; j >= 0; --j) { 1959 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) 1960 continue; 1961 newt = (time_t)(t + sp->ttis[j].tt_gmtoff - 1962 sp->ttis[i].tt_gmtoff); 1963 if ((*funcp)(sp, &newt, offset, &mytm) == NULL) 1964 continue; 1965 if (tmcomp(&mytm, &yourtm) != 0) 1966 continue; 1967 if (mytm.tm_isdst != yourtm.tm_isdst) 1968 continue; 1969 /* 1970 ** We have a match. 1971 */ 1972 t = newt; 1973 goto label; 1974 } 1975 } 1976 goto invalid; 1977 } 1978 label: 1979 newt = t + saved_seconds; 1980 if ((newt < t) != (saved_seconds < 0)) 1981 goto overflow; 1982 t = newt; 1983 if ((*funcp)(sp, &t, offset, tmp)) { 1984 *okayp = TRUE; 1985 return t; 1986 } 1987 overflow: 1988 errno = EOVERFLOW; 1989 return WRONG; 1990 invalid: 1991 errno = EINVAL; 1992 return WRONG; 1993 } 1994 1995 static time_t 1996 time2(const timezone_t sp, struct tm *const tmp, subfun_t funcp, 1997 const long offset, int *const okayp) 1998 { 1999 time_t t; 2000 2001 /* 2002 ** First try without normalization of seconds 2003 ** (in case tm_sec contains a value associated with a leap second). 2004 ** If that fails, try with normalization of seconds. 2005 */ 2006 t = time2sub(sp, tmp, funcp, offset, okayp, FALSE); 2007 return *okayp ? t : time2sub(sp, tmp, funcp, offset, okayp, TRUE); 2008 } 2009 2010 static time_t 2011 time1(const timezone_t sp, struct tm *const tmp, subfun_t funcp, 2012 long offset) 2013 { 2014 time_t t; 2015 int samei, otheri; 2016 int sameind, otherind; 2017 int i; 2018 int nseen; 2019 int seen[TZ_MAX_TYPES]; 2020 int types[TZ_MAX_TYPES]; 2021 int okay; 2022 2023 if (tmp == NULL) { 2024 errno = EINVAL; 2025 return WRONG; 2026 } 2027 if (tmp->tm_isdst > 1) 2028 tmp->tm_isdst = 1; 2029 t = time2(sp, tmp, funcp, offset, &okay); 2030 #ifdef PCTS 2031 /* 2032 ** PCTS code courtesy Grant Sullivan. 2033 */ 2034 if (okay) 2035 return t; 2036 if (tmp->tm_isdst < 0) 2037 tmp->tm_isdst = 0; /* reset to std and try again */ 2038 #endif /* defined PCTS */ 2039 #ifndef PCTS 2040 if (okay || tmp->tm_isdst < 0) 2041 return t; 2042 #endif /* !defined PCTS */ 2043 /* 2044 ** We're supposed to assume that somebody took a time of one type 2045 ** and did some math on it that yielded a "struct tm" that's bad. 2046 ** We try to divine the type they started from and adjust to the 2047 ** type they need. 2048 */ 2049 if (sp == NULL) { 2050 errno = EINVAL; 2051 return WRONG; 2052 } 2053 for (i = 0; i < sp->typecnt; ++i) 2054 seen[i] = FALSE; 2055 nseen = 0; 2056 for (i = sp->timecnt - 1; i >= 0; --i) 2057 if (!seen[sp->types[i]]) { 2058 seen[sp->types[i]] = TRUE; 2059 types[nseen++] = sp->types[i]; 2060 } 2061 for (sameind = 0; sameind < nseen; ++sameind) { 2062 samei = types[sameind]; 2063 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) 2064 continue; 2065 for (otherind = 0; otherind < nseen; ++otherind) { 2066 otheri = types[otherind]; 2067 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) 2068 continue; 2069 tmp->tm_sec += (int)(sp->ttis[otheri].tt_gmtoff - 2070 sp->ttis[samei].tt_gmtoff); 2071 tmp->tm_isdst = !tmp->tm_isdst; 2072 t = time2(sp, tmp, funcp, offset, &okay); 2073 if (okay) 2074 return t; 2075 tmp->tm_sec -= (int)(sp->ttis[otheri].tt_gmtoff - 2076 sp->ttis[samei].tt_gmtoff); 2077 tmp->tm_isdst = !tmp->tm_isdst; 2078 } 2079 } 2080 errno = EOVERFLOW; 2081 return WRONG; 2082 } 2083 2084 time_t 2085 mktime_z(const timezone_t sp, struct tm *tmp) 2086 { 2087 time_t t; 2088 if (sp == NULL) 2089 t = time1(NULL, tmp, gmtsub, 0L); 2090 else 2091 t = time1(sp, tmp, localsub, 0L); 2092 return t; 2093 } 2094 2095 time_t 2096 mktime(struct tm * const tmp) 2097 { 2098 time_t result; 2099 2100 rwlock_wrlock(&lcl_lock); 2101 tzset_unlocked(); 2102 result = mktime_z(lclptr, tmp); 2103 rwlock_unlock(&lcl_lock); 2104 return result; 2105 } 2106 2107 #ifdef STD_INSPIRED 2108 2109 time_t 2110 timelocal_z(const timezone_t sp, struct tm *tmp) 2111 { 2112 if (tmp != NULL) 2113 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 2114 return mktime_z(sp, tmp); 2115 } 2116 2117 time_t 2118 timelocal(struct tm *const tmp) 2119 { 2120 if (tmp != NULL) 2121 tmp->tm_isdst = -1; /* in case it wasn't initialized */ 2122 return mktime(tmp); 2123 } 2124 2125 time_t 2126 timegm(struct tm *const tmp) 2127 { 2128 time_t t; 2129 2130 if (tmp != NULL) 2131 tmp->tm_isdst = 0; 2132 t = time1(gmtptr, tmp, gmtsub, 0L); 2133 return t; 2134 } 2135 2136 time_t 2137 timeoff(struct tm *const tmp, const long offset) 2138 { 2139 time_t t; 2140 2141 if (tmp != NULL) 2142 tmp->tm_isdst = 0; 2143 t = time1(gmtptr, tmp, gmtsub, offset); 2144 return t; 2145 } 2146 2147 #endif /* defined STD_INSPIRED */ 2148 2149 #ifdef CMUCS 2150 2151 /* 2152 ** The following is supplied for compatibility with 2153 ** previous versions of the CMUCS runtime library. 2154 */ 2155 2156 long 2157 gtime(struct tm *const tmp) 2158 { 2159 const time_t t = mktime(tmp); 2160 2161 if (t == WRONG) 2162 return -1; 2163 return t; 2164 } 2165 2166 #endif /* defined CMUCS */ 2167 2168 /* 2169 ** XXX--is the below the right way to conditionalize?? 2170 */ 2171 2172 #ifdef STD_INSPIRED 2173 2174 /* 2175 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599 2176 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which 2177 ** is not the case if we are accounting for leap seconds. 2178 ** So, we provide the following conversion routines for use 2179 ** when exchanging timestamps with POSIX conforming systems. 2180 */ 2181 2182 static long 2183 leapcorr(const timezone_t sp, time_t *timep) 2184 { 2185 struct lsinfo * lp; 2186 int i; 2187 2188 i = sp->leapcnt; 2189 while (--i >= 0) { 2190 lp = &sp->lsis[i]; 2191 if (*timep >= lp->ls_trans) 2192 return lp->ls_corr; 2193 } 2194 return 0; 2195 } 2196 2197 time_t 2198 time2posix_z(const timezone_t sp, time_t t) 2199 { 2200 return (time_t)(t - leapcorr(sp, &t)); 2201 } 2202 2203 time_t 2204 time2posix(time_t t) 2205 { 2206 time_t result; 2207 rwlock_wrlock(&lcl_lock); 2208 tzset_unlocked(); 2209 result = (time_t)(t - leapcorr(lclptr, &t)); 2210 rwlock_unlock(&lcl_lock); 2211 return (result); 2212 } 2213 2214 time_t 2215 posix2time_z(const timezone_t sp, time_t t) 2216 { 2217 time_t x; 2218 time_t y; 2219 2220 /* 2221 ** For a positive leap second hit, the result 2222 ** is not unique. For a negative leap second 2223 ** hit, the corresponding time doesn't exist, 2224 ** so we return an adjacent second. 2225 */ 2226 x = (time_t)(t + leapcorr(sp, &t)); 2227 y = (time_t)(x - leapcorr(sp, &x)); 2228 if (y < t) { 2229 do { 2230 x++; 2231 y = (time_t)(x - leapcorr(sp, &x)); 2232 } while (y < t); 2233 if (t != y) { 2234 return x - 1; 2235 } 2236 } else if (y > t) { 2237 do { 2238 --x; 2239 y = (time_t)(x - leapcorr(sp, &x)); 2240 } while (y > t); 2241 if (t != y) { 2242 return x + 1; 2243 } 2244 } 2245 return x; 2246 } 2247 2248 2249 2250 time_t 2251 posix2time(time_t t) 2252 { 2253 time_t result; 2254 2255 rwlock_wrlock(&lcl_lock); 2256 tzset_unlocked(); 2257 result = posix2time_z(lclptr, t); 2258 rwlock_unlock(&lcl_lock); 2259 return result; 2260 } 2261 2262 #endif /* defined STD_INSPIRED */ 2263