zdump.c revision 1.42
1 /* $NetBSD: zdump.c,v 1.42 2015/08/13 11:21:18 christos Exp $ */ 2 /* 3 ** This file is in the public domain, so clarified as of 4 ** 2009-05-17 by Arthur David Olson. 5 */ 6 7 #include <sys/cdefs.h> 8 #ifndef lint 9 __RCSID("$NetBSD: zdump.c,v 1.42 2015/08/13 11:21:18 christos Exp $"); 10 #endif /* !defined lint */ 11 12 /* 13 ** This code has been made independent of the rest of the time 14 ** conversion package to increase confidence in the verification it provides. 15 ** You can use this code to help in verifying other implementations. 16 ** 17 ** To do this, compile with -DUSE_LTZ=0 and link without the tz library. 18 */ 19 20 #ifndef NETBSD_INSPIRED 21 # define NETBSD_INSPIRED 1 22 #endif 23 #ifndef USE_LTZ 24 # define USE_LTZ 1 25 #endif 26 27 #if USE_LTZ 28 #include "private.h" 29 #endif 30 31 /* Enable tm_gmtoff and tm_zone on GNUish systems. */ 32 #define _GNU_SOURCE 1 33 /* Enable strtoimax on Solaris 10. */ 34 #define __EXTENSIONS__ 1 35 36 #include "stdio.h" /* for stdout, stderr */ 37 #include "string.h" /* for strcpy */ 38 #include "sys/types.h" /* for time_t */ 39 #include "time.h" /* for struct tm */ 40 #include "stdlib.h" /* for exit, malloc, atoi */ 41 #include "limits.h" /* for CHAR_BIT, LLONG_MAX */ 42 #include <errno.h> 43 #include <err.h> 44 45 /* 46 ** Substitutes for pre-C99 compilers. 47 ** Much of this section of code is stolen from private.h. 48 */ 49 50 #ifndef HAVE_STDINT_H 51 # define HAVE_STDINT_H \ 52 (199901 <= __STDC_VERSION__ \ 53 || 2 < __GLIBC__ + (1 <= __GLIBC_MINOR__) \ 54 || __CYGWIN__) 55 #endif 56 #if HAVE_STDINT_H 57 # include "stdint.h" 58 #endif 59 #ifndef HAVE_INTTYPES_H 60 # define HAVE_INTTYPES_H HAVE_STDINT_H 61 #endif 62 #if HAVE_INTTYPES_H 63 # include <inttypes.h> 64 #endif 65 66 #ifndef INT_FAST32_MAX 67 # if INT_MAX >> 31 == 0 68 typedef long int_fast32_t; 69 # else 70 typedef int int_fast32_t; 71 # endif 72 #endif 73 74 /* Pre-C99 GCC compilers define __LONG_LONG_MAX__ instead of LLONG_MAX. */ 75 #if !defined LLONG_MAX && defined __LONG_LONG_MAX__ 76 # define LLONG_MAX __LONG_LONG_MAX__ 77 #endif 78 79 #ifndef INTMAX_MAX 80 # ifdef LLONG_MAX 81 typedef long long intmax_t; 82 # define strtoimax strtoll 83 # define INTMAX_MAX LLONG_MAX 84 # else 85 typedef long intmax_t; 86 # define strtoimax strtol 87 # define INTMAX_MAX LONG_MAX 88 # endif 89 #endif 90 91 #ifndef PRIdMAX 92 # if INTMAX_MAX == LLONG_MAX 93 # define PRIdMAX "lld" 94 # else 95 # define PRIdMAX "ld" 96 # endif 97 #endif 98 99 /* Infer TM_ZONE on systems where this information is known, but suppress 100 guessing if NO_TM_ZONE is defined. Similarly for TM_GMTOFF. */ 101 #if (defined __GLIBC__ \ 102 || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__ \ 103 || (defined __APPLE__ && defined __MACH__)) 104 # if !defined TM_GMTOFF && !defined NO_TM_GMTOFF 105 # define TM_GMTOFF tm_gmtoff 106 # endif 107 # if !defined TM_ZONE && !defined NO_TM_ZONE 108 # define TM_ZONE tm_zone 109 # endif 110 #endif 111 112 #ifndef HAVE_LOCALTIME_R 113 # define HAVE_LOCALTIME_R 1 114 #endif 115 116 #ifndef HAVE_LOCALTIME_RZ 117 # ifdef TM_ZONE 118 # define HAVE_LOCALTIME_RZ (NETBSD_INSPIRED && USE_LTZ) 119 # else 120 # define HAVE_LOCALTIME_RZ 0 121 # endif 122 #endif 123 124 #ifndef HAVE_TZSET 125 # define HAVE_TZSET 1 126 #endif 127 128 #ifndef ZDUMP_LO_YEAR 129 #define ZDUMP_LO_YEAR (-500) 130 #endif /* !defined ZDUMP_LO_YEAR */ 131 132 #ifndef ZDUMP_HI_YEAR 133 #define ZDUMP_HI_YEAR 2500 134 #endif /* !defined ZDUMP_HI_YEAR */ 135 136 #ifndef MAX_STRING_LENGTH 137 #define MAX_STRING_LENGTH 1024 138 #endif /* !defined MAX_STRING_LENGTH */ 139 140 #if __STDC_VERSION__ < 199901 141 # define true 1 142 # define false 0 143 # define bool int 144 #else 145 # include <stdbool.h> 146 #endif 147 148 #ifndef EXIT_SUCCESS 149 #define EXIT_SUCCESS 0 150 #endif /* !defined EXIT_SUCCESS */ 151 152 #ifndef EXIT_FAILURE 153 #define EXIT_FAILURE 1 154 #endif /* !defined EXIT_FAILURE */ 155 156 #ifndef SECSPERMIN 157 #define SECSPERMIN 60 158 #endif /* !defined SECSPERMIN */ 159 160 #ifndef MINSPERHOUR 161 #define MINSPERHOUR 60 162 #endif /* !defined MINSPERHOUR */ 163 164 #ifndef SECSPERHOUR 165 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 166 #endif /* !defined SECSPERHOUR */ 167 168 #ifndef HOURSPERDAY 169 #define HOURSPERDAY 24 170 #endif /* !defined HOURSPERDAY */ 171 172 #ifndef EPOCH_YEAR 173 #define EPOCH_YEAR 1970 174 #endif /* !defined EPOCH_YEAR */ 175 176 #ifndef TM_YEAR_BASE 177 #define TM_YEAR_BASE 1900 178 #endif /* !defined TM_YEAR_BASE */ 179 180 #ifndef DAYSPERNYEAR 181 #define DAYSPERNYEAR 365 182 #endif /* !defined DAYSPERNYEAR */ 183 184 #ifndef isleap 185 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 186 #endif /* !defined isleap */ 187 188 #ifndef isleap_sum 189 /* 190 ** See tzfile.h for details on isleap_sum. 191 */ 192 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 193 #endif /* !defined isleap_sum */ 194 195 #define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY) 196 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR) 197 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY) 198 #define SECSPER400YEARS (SECSPERNYEAR * (intmax_t) (300 + 3) \ 199 + SECSPERLYEAR * (intmax_t) (100 - 3)) 200 201 /* 202 ** True if SECSPER400YEARS is known to be representable as an 203 ** intmax_t. It's OK that SECSPER400YEARS_FITS can in theory be false 204 ** even if SECSPER400YEARS is representable, because when that happens 205 ** the code merely runs a bit more slowly, and this slowness doesn't 206 ** occur on any practical platform. 207 */ 208 enum { SECSPER400YEARS_FITS = SECSPERLYEAR <= INTMAX_MAX / 400 }; 209 210 #ifndef HAVE_GETTEXT 211 #define HAVE_GETTEXT 0 212 #endif 213 #if HAVE_GETTEXT 214 #include "locale.h" /* for setlocale */ 215 #include "libintl.h" 216 #endif /* HAVE_GETTEXT */ 217 218 #ifndef ATTRIBUTE_PURE 219 #if 2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__) 220 # define ATTRIBUTE_PURE __attribute__ ((ATTRIBUTE_PURE__)) 221 #else 222 # define ATTRIBUTE_PURE /* empty */ 223 #endif 224 #endif 225 226 #ifndef INITIALIZE 227 #if defined(__GNUC__) || defined(__lint__) 228 #define INITIALIZE(x) ((x) = 0) 229 #else /* !defined GNUC || lint */ 230 #define INITIALIZE(x) 231 #endif /* !defined GNUC || lint */ 232 #endif /* !defined INITIALIZE */ 233 234 /* 235 ** For the benefit of GNU folk... 236 ** '_(MSGID)' uses the current locale's message library string for MSGID. 237 ** The default is to use gettext if available, and use MSGID otherwise. 238 */ 239 240 #ifndef _ 241 #if HAVE_GETTEXT 242 #define _(msgid) gettext(msgid) 243 #else /* !HAVE_GETTEXT */ 244 #define _(msgid) msgid 245 #endif /* !HAVE_GETTEXT */ 246 #endif /* !defined _ */ 247 248 #if !defined TZ_DOMAIN && defined HAVE_GETTEXT 249 # define TZ_DOMAIN "tz" 250 #endif 251 252 #if ! HAVE_LOCALTIME_RZ 253 # undef timezone_t 254 # define timezone_t char ** 255 #endif 256 257 extern char ** environ; 258 extern int getopt(int argc, char * const argv[], 259 const char * options); 260 extern char * optarg; 261 extern int optind; 262 263 /* The minimum and maximum finite time values. */ 264 enum { atime_shift = CHAR_BIT * sizeof (time_t) - 2 }; 265 static time_t absolute_min_time = 266 ((time_t) -1 < 0 267 ? (- ((time_t) ~ (time_t) 0 < 0) 268 - (((time_t) 1 << atime_shift) - 1 + ((time_t) 1 << atime_shift))) 269 : 0); 270 static time_t absolute_max_time = 271 ((time_t) -1 < 0 272 ? (((time_t) 1 << atime_shift) - 1 + ((time_t) 1 << atime_shift)) 273 : -1); 274 static size_t longest; 275 static char * progname; 276 static bool warned; 277 static bool errout; 278 279 static char const *abbr(struct tm const *); 280 static intmax_t delta(struct tm *, struct tm *) ATTRIBUTE_PURE; 281 static void dumptime(struct tm const *); 282 static time_t hunt(timezone_t, char *, time_t, time_t); 283 static void show(timezone_t, char *, time_t, bool); 284 static const char *tformat(void); 285 static time_t yeartot(intmax_t) ATTRIBUTE_PURE; 286 287 /* Unlike <ctype.h>'s isdigit, this also works if c < 0 | c > UCHAR_MAX. */ 288 #define is_digit(c) ((unsigned)(c) - '0' <= 9) 289 290 /* Is A an alphabetic character in the C locale? */ 291 static bool 292 is_alpha(char a) 293 { 294 switch (a) { 295 default: 296 return false; 297 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G': 298 case 'H': case 'I': case 'J': case 'K': case 'L': case 'M': case 'N': 299 case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T': case 'U': 300 case 'V': case 'W': case 'X': case 'Y': case 'Z': 301 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g': 302 case 'h': case 'i': case 'j': case 'k': case 'l': case 'm': case 'n': 303 case 'o': case 'p': case 'q': case 'r': case 's': case 't': case 'u': 304 case 'v': case 'w': case 'x': case 'y': case 'z': 305 return true; 306 } 307 } 308 309 /* Return A + B, exiting if the result would overflow. */ 310 static size_t 311 sumsize(size_t a, size_t b) 312 { 313 size_t sum = a + b; 314 if (sum < a) 315 errx(EXIT_FAILURE, "size overflow"); 316 return sum; 317 } 318 319 #if ! HAVE_TZSET 320 # undef tzset 321 # define tzset zdump_tzset 322 static void tzset(void) { } 323 #endif 324 325 /* Assume gmtime_r works if localtime_r does. 326 A replacement localtime_r is defined below if needed. */ 327 #if ! HAVE_LOCALTIME_R 328 329 # undef gmtime_r 330 # define gmtime_r zdump_gmtime_r 331 332 static struct tm * 333 gmtime_r(time_t *tp, struct tm *tmp) 334 { 335 struct tm *r = gmtime(tp); 336 if (r) { 337 *tmp = *r; 338 r = tmp; 339 } 340 return r; 341 } 342 343 #endif 344 345 /* Platforms with TM_ZONE don't need tzname, so they can use the 346 faster localtime_rz or localtime_r if available. */ 347 348 #if defined TM_ZONE && HAVE_LOCALTIME_RZ 349 # define USE_LOCALTIME_RZ true 350 #else 351 # define USE_LOCALTIME_RZ false 352 #endif 353 354 #if ! USE_LOCALTIME_RZ 355 356 # if !defined TM_ZONE || ! HAVE_LOCALTIME_R || ! HAVE_TZSET 357 # undef localtime_r 358 # define localtime_r zdump_localtime_r 359 static struct tm * 360 localtime_r(time_t *tp, struct tm *tmp) 361 { 362 struct tm *r = localtime(tp); 363 if (r) { 364 *tmp = *r; 365 r = tmp; 366 } 367 return r; 368 } 369 # endif 370 371 # undef localtime_rz 372 # define localtime_rz zdump_localtime_rz 373 static struct tm * 374 localtime_rz(timezone_t rz, time_t *tp, struct tm *tmp) 375 { 376 return localtime_r(tp, tmp); 377 } 378 379 # ifdef TYPECHECK 380 # undef mktime_z 381 # define mktime_z zdump_mktime_z 382 static time_t 383 mktime_z(timezone_t tz, struct tm *tmp) 384 { 385 return mktime(tmp); 386 } 387 # endif 388 389 # undef tzalloc 390 # undef tzfree 391 # define tzalloc zdump_tzalloc 392 # define tzfree zdump_tzfree 393 394 static timezone_t 395 tzalloc(char const *val) 396 { 397 static char **fakeenv; 398 char **env = fakeenv; 399 char *env0; 400 if (! env) { 401 char **e = environ; 402 int to; 403 404 while (*e++) 405 continue; 406 env = malloc(sumsize(sizeof *environ, 407 (e - environ) * sizeof *environ)); 408 if (! env) { 409 err(EXIT_FAILURE, "malloc"); 410 } 411 to = 1; 412 for (e = environ; (env[to] = *e); e++) 413 to += strncmp(*e, "TZ=", 3) != 0; 414 } 415 env0 = malloc(sumsize(sizeof "TZ=", strlen(val))); 416 if (! env0) { 417 err(EXIT_FAILURE, "malloc"); 418 } 419 env[0] = strcat(strcpy(env0, "TZ="), val); 420 environ = fakeenv = env; 421 tzset(); 422 return env; 423 } 424 425 static void 426 tzfree(timezone_t env) 427 { 428 environ = env + 1; 429 free(env[0]); 430 } 431 #endif /* ! USE_LOCALTIME_RZ */ 432 433 /* A UTC time zone, and its initializer. */ 434 static timezone_t gmtz; 435 static void 436 gmtzinit(void) 437 { 438 if (USE_LOCALTIME_RZ) { 439 static char const utc[] = "UTC0"; 440 gmtz = tzalloc(utc); 441 if (!gmtz) { 442 err(EXIT_FAILURE, "Cannot create %s", utc); 443 } 444 } 445 } 446 447 /* Convert *TP to UTC, storing the broken-down time into *TMP. 448 Return TMP if successful, NULL otherwise. This is like gmtime_r(TP, TMP), 449 except typically faster if USE_LOCALTIME_RZ. */ 450 static struct tm * 451 my_gmtime_r(time_t *tp, struct tm *tmp) 452 { 453 return USE_LOCALTIME_RZ ? 454 localtime_rz(gmtz, tp, tmp) : gmtime_r(tp, tmp); 455 } 456 457 #ifndef TYPECHECK 458 #define my_localtime_rz localtime_rz 459 #else /* !defined TYPECHECK */ 460 static struct tm * 461 my_localtime_rz(timezone_t tz, const time_t *tp, struct tm *tmp) 462 { 463 tmp = localtime_rz(tz, tp, tmp); 464 if (tmp) { 465 struct tm tm; 466 time_t t; 467 468 tm = *tmp; 469 t = mktime_z(tz, &tm); 470 if (t != *tp) { 471 (void) fflush(stdout); 472 (void) fprintf(stderr, "\n%s: ", progname); 473 (void) fprintf(stderr, tformat(), *tp); 474 (void) fprintf(stderr, " ->"); 475 (void) fprintf(stderr, " year=%d", tmp->tm_year); 476 (void) fprintf(stderr, " mon=%d", tmp->tm_mon); 477 (void) fprintf(stderr, " mday=%d", tmp->tm_mday); 478 (void) fprintf(stderr, " hour=%d", tmp->tm_hour); 479 (void) fprintf(stderr, " min=%d", tmp->tm_min); 480 (void) fprintf(stderr, " sec=%d", tmp->tm_sec); 481 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst); 482 (void) fprintf(stderr, " -> "); 483 (void) fprintf(stderr, tformat(), t); 484 (void) fprintf(stderr, "\n"); 485 errout = true; 486 } 487 } 488 return tmp; 489 } 490 #endif /* !defined TYPECHECK */ 491 492 static void 493 abbrok(const char *const abbrp, const char *const zone) 494 { 495 const char *cp; 496 const char *wp; 497 498 if (warned) 499 return; 500 cp = abbrp; 501 while (is_alpha(*cp) || is_digit(*cp) || *cp == '-' || *cp == '+') 502 ++cp; 503 if (cp - abbrp < 3) 504 wp = _("has fewer than 3 characters"); 505 else if (cp - abbrp > 6) 506 wp = _("has more than 6 characters"); 507 else if (*cp) 508 wp = _("has characters other than ASCII alphanumerics, '-' or '+'"); 509 else 510 return; 511 (void) fflush(stdout); 512 (void) fprintf(stderr, 513 _("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"), 514 progname, zone, abbrp, wp); 515 warned = errout = true; 516 } 517 518 /* Return a time zone abbreviation. If the abbreviation needs to be 519 saved, use *BUF (of size *BUFALLOC) to save it, and return the 520 abbreviation in the possibly-reallocated *BUF. Otherwise, just 521 return the abbreviation. Get the abbreviation from TMP. 522 Exit on memory allocation failure. */ 523 static char const * 524 saveabbr(char **buf, size_t *bufalloc, struct tm const *tmp) 525 { 526 char const *ab = abbr(tmp); 527 if (HAVE_LOCALTIME_RZ) 528 return ab; 529 else { 530 size_t ablen = strlen(ab); 531 if (*bufalloc <= ablen) { 532 free(*buf); 533 534 /* Make the new buffer at least twice as long as the 535 old, to avoid O(N**2) behavior on repeated calls. */ 536 *bufalloc = sumsize(*bufalloc, ablen + 1); 537 *buf = malloc(*bufalloc); 538 if (! *buf) { 539 err(EXIT_FAILURE, "malloc"); 540 } 541 } 542 return strcpy(*buf, ab); 543 } 544 } 545 546 static void 547 close_file(FILE *stream) 548 { 549 char const *e = (ferror(stream) ? _("I/O error") 550 : fclose(stream) != 0 ? strerror(errno) : NULL); 551 if (e) { 552 errx(EXIT_FAILURE, "%s", e); 553 } 554 } 555 556 __dead static void 557 usage(FILE *const stream, const int status) 558 { 559 (void) fprintf(stream, 560 _("%s: usage: %s [--version] [--help] [-{vV}] [-{ct} [lo,]hi] zonename ...\n" 561 "\n" 562 "Report bugs to %s.\n"), 563 progname, progname, REPORT_BUGS_TO); 564 if (status == EXIT_SUCCESS) 565 close_file(stream); 566 exit(status); 567 } 568 569 int 570 main(int argc, char *argv[]) 571 { 572 /* These are static so that they're initially zero. */ 573 static char * abbrev; 574 static size_t abbrevsize; 575 static struct tm newtm; 576 577 int i; 578 bool vflag; 579 bool Vflag; 580 char * cutarg; 581 char * cuttimes; 582 time_t cutlotime; 583 time_t cuthitime; 584 time_t now; 585 time_t t; 586 time_t newt; 587 struct tm tm; 588 struct tm * tmp; 589 struct tm * newtmp; 590 591 cutlotime = absolute_min_time; 592 cuthitime = absolute_max_time; 593 #if HAVE_GETTEXT 594 (void) setlocale(LC_ALL, ""); 595 #ifdef TZ_DOMAINDIR 596 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR); 597 #endif /* defined TEXTDOMAINDIR */ 598 (void) textdomain(TZ_DOMAIN); 599 #endif /* HAVE_GETTEXT */ 600 progname = argv[0]; 601 for (i = 1; i < argc; ++i) 602 if (strcmp(argv[i], "--version") == 0) { 603 (void) printf("zdump %s%s\n", PKGVERSION, TZVERSION); 604 return EXIT_SUCCESS; 605 } else if (strcmp(argv[i], "--help") == 0) { 606 usage(stdout, EXIT_SUCCESS); 607 } 608 vflag = Vflag = false; 609 cutarg = cuttimes = NULL; 610 for (;;) 611 switch (getopt(argc, argv, "c:t:vV")) { 612 case 'c': cutarg = optarg; break; 613 case 't': cuttimes = optarg; break; 614 case 'v': vflag = true; break; 615 case 'V': Vflag = true; break; 616 case -1: 617 if (! (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) 618 goto arg_processing_done; 619 /* Fall through. */ 620 default: 621 usage(stderr, EXIT_FAILURE); 622 } 623 arg_processing_done:; 624 625 if (vflag | Vflag) { 626 intmax_t lo; 627 intmax_t hi; 628 char *loend, *hiend; 629 intmax_t cutloyear = ZDUMP_LO_YEAR; 630 intmax_t cuthiyear = ZDUMP_HI_YEAR; 631 if (cutarg != NULL) { 632 lo = strtoimax(cutarg, &loend, 10); 633 if (cutarg != loend && !*loend) { 634 hi = lo; 635 cuthiyear = hi; 636 } else if (cutarg != loend && *loend == ',' 637 && (hi = strtoimax(loend + 1, &hiend, 10), 638 loend + 1 != hiend && !*hiend)) { 639 cutloyear = lo; 640 cuthiyear = hi; 641 } else { 642 fprintf(stderr, _("%s: wild -c argument %s\n"), 643 progname, cutarg); 644 return EXIT_FAILURE; 645 } 646 } 647 if (cutarg != NULL || cuttimes == NULL) { 648 cutlotime = yeartot(cutloyear); 649 cuthitime = yeartot(cuthiyear); 650 } 651 if (cuttimes != NULL) { 652 lo = strtoimax(cuttimes, &loend, 10); 653 if (cuttimes != loend && !*loend) { 654 hi = lo; 655 if (hi < cuthitime) { 656 if (hi < absolute_min_time) 657 hi = absolute_min_time; 658 cuthitime = hi; 659 } 660 } else if (cuttimes != loend && *loend == ',' 661 && (hi = strtoimax(loend + 1, &hiend, 10), 662 loend + 1 != hiend && !*hiend)) { 663 if (cutlotime < lo) { 664 if (absolute_max_time < lo) 665 lo = absolute_max_time; 666 cutlotime = lo; 667 } 668 if (hi < cuthitime) { 669 if (hi < absolute_min_time) 670 hi = absolute_min_time; 671 cuthitime = hi; 672 } 673 } else { 674 (void) fprintf(stderr, 675 _("%s: wild -t argument %s\n"), 676 progname, cuttimes); 677 return EXIT_FAILURE; 678 } 679 } 680 } 681 gmtzinit(); 682 now = time(NULL); 683 longest = 0; 684 for (i = optind; i < argc; i++) { 685 size_t arglen = strlen(argv[i]); 686 if (longest < arglen) 687 longest = arglen < INT_MAX ? arglen : INT_MAX; 688 } 689 690 for (i = optind; i < argc; ++i) { 691 timezone_t tz = tzalloc(argv[i]); 692 char const *ab; 693 if (!tz) { 694 errx(EXIT_FAILURE, "%s", argv[i]); 695 } 696 if (! (vflag | Vflag)) { 697 show(tz, argv[i], now, false); 698 tzfree(tz); 699 continue; 700 } 701 warned = false; 702 t = absolute_min_time; 703 if (!Vflag) { 704 show(tz, argv[i], t, true); 705 t += SECSPERDAY; 706 show(tz, argv[i], t, true); 707 } 708 if (t < cutlotime) 709 t = cutlotime; 710 tmp = my_localtime_rz(tz, &t, &tm); 711 if (tmp) 712 ab = saveabbr(&abbrev, &abbrevsize, &tm); 713 else 714 ab = NULL; 715 while (t < cuthitime) { 716 newt = ((t < absolute_max_time - SECSPERDAY / 2 717 && t + SECSPERDAY / 2 < cuthitime) 718 ? t + SECSPERDAY / 2 719 : cuthitime); 720 newtmp = localtime_rz(tz, &newt, &newtm); 721 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) : 722 (delta(&newtm, &tm) != (newt - t) || 723 newtm.tm_isdst != tm.tm_isdst || 724 strcmp(abbr(&newtm), ab) != 0)) { 725 newt = hunt(tz, argv[i], t, newt); 726 newtmp = localtime_rz(tz, &newt, &newtm); 727 if (newtmp) 728 ab = saveabbr(&abbrev, &abbrevsize, 729 &newtm); 730 } 731 t = newt; 732 tm = newtm; 733 tmp = newtmp; 734 } 735 if (!Vflag) { 736 t = absolute_max_time; 737 t -= SECSPERDAY; 738 show(tz, argv[i], t, true); 739 t += SECSPERDAY; 740 show(tz, argv[i], t, true); 741 } 742 tzfree(tz); 743 } 744 close_file(stdout); 745 if (errout && (ferror(stderr) || fclose(stderr) != 0)) 746 return EXIT_FAILURE; 747 return EXIT_SUCCESS; 748 } 749 750 static time_t 751 yeartot(intmax_t y) 752 { 753 intmax_t myy, seconds, years; 754 time_t t; 755 756 myy = EPOCH_YEAR; 757 t = 0; 758 while (myy < y) { 759 if (SECSPER400YEARS_FITS && 400 <= y - myy) { 760 intmax_t diff400 = (y - myy) / 400; 761 if (INTMAX_MAX / SECSPER400YEARS < diff400) 762 return absolute_max_time; 763 seconds = diff400 * SECSPER400YEARS; 764 years = diff400 * 400; 765 } else { 766 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR; 767 years = 1; 768 } 769 myy += years; 770 if (t > absolute_max_time - seconds) 771 return absolute_max_time; 772 t += seconds; 773 } 774 while (y < myy) { 775 if (SECSPER400YEARS_FITS && y + 400 <= myy && myy < 0) { 776 intmax_t diff400 = (myy - y) / 400; 777 if (INTMAX_MAX / SECSPER400YEARS < diff400) 778 return absolute_min_time; 779 seconds = diff400 * SECSPER400YEARS; 780 years = diff400 * 400; 781 } else { 782 seconds = isleap(myy - 1) ? SECSPERLYEAR : SECSPERNYEAR; 783 years = 1; 784 } 785 myy -= years; 786 if (t < absolute_min_time + seconds) 787 return absolute_min_time; 788 t -= seconds; 789 } 790 return t; 791 } 792 793 static time_t 794 hunt(timezone_t tz, char *name, time_t lot, time_t hit) 795 { 796 static char * loab; 797 static size_t loabsize; 798 char const * ab; 799 time_t t; 800 struct tm lotm; 801 struct tm * lotmp; 802 struct tm tm; 803 struct tm * tmp; 804 805 lotmp = my_localtime_rz(tz, &lot, &lotm); 806 if (lotmp) 807 ab = saveabbr(&loab, &loabsize, &lotm); 808 else 809 ab = NULL; 810 for ( ; ; ) { 811 time_t diff = hit - lot; 812 if (diff < 2) 813 break; 814 t = lot; 815 t += diff / 2; 816 if (t <= lot) 817 ++t; 818 else if (t >= hit) 819 --t; 820 tmp = my_localtime_rz(tz, &t, &tm); 821 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) : 822 (delta(&tm, &lotm) == (t - lot) && 823 tm.tm_isdst == lotm.tm_isdst && 824 strcmp(abbr(&tm), ab) == 0)) { 825 lot = t; 826 lotm = tm; 827 lotmp = tmp; 828 } else hit = t; 829 } 830 show(tz, name, lot, true); 831 show(tz, name, hit, true); 832 return hit; 833 } 834 835 /* 836 ** Thanks to Paul Eggert for logic used in delta. 837 */ 838 839 static intmax_t 840 delta(struct tm *newp, struct tm *oldp) 841 { 842 intmax_t result; 843 int tmy; 844 845 if (newp->tm_year < oldp->tm_year) 846 return -delta(oldp, newp); 847 result = 0; 848 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy) 849 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE); 850 result += newp->tm_yday - oldp->tm_yday; 851 result *= HOURSPERDAY; 852 result += newp->tm_hour - oldp->tm_hour; 853 result *= MINSPERHOUR; 854 result += newp->tm_min - oldp->tm_min; 855 result *= SECSPERMIN; 856 result += newp->tm_sec - oldp->tm_sec; 857 return result; 858 } 859 860 #ifndef TM_GMTOFF 861 /* Return A->tm_yday, adjusted to compare it fairly to B->tm_yday. 862 Assume A and B differ by at most one year. */ 863 static int 864 adjusted_yday(struct tm const *a, struct tm const *b) 865 { 866 int yday = a->tm_yday; 867 if (b->tm_year < a->tm_year) 868 yday += 365 + isleap_sum(b->tm_year, TM_YEAR_BASE); 869 return yday; 870 } 871 #endif 872 873 /* If A is the broken-down local time and B the broken-down UTC for 874 the same instant, return A's UTC offset in seconds, where positive 875 offsets are east of Greenwich. On failure, return LONG_MIN. */ 876 static long 877 gmtoff(struct tm const *a, struct tm const *b) 878 { 879 #ifdef TM_GMTOFF 880 return a->TM_GMTOFF; 881 #else 882 if (! b) 883 return LONG_MIN; 884 else { 885 int ayday = adjusted_yday(a, b); 886 int byday = adjusted_yday(b, a); 887 int days = ayday - byday; 888 long hours = a->tm_hour - b->tm_hour + 24 * days; 889 long minutes = a->tm_min - b->tm_min + 60 * hours; 890 long seconds = a->tm_sec - b->tm_sec + 60 * minutes; 891 return seconds; 892 } 893 #endif 894 } 895 896 static void 897 show(timezone_t tz, char *zone, time_t t, bool v) 898 { 899 struct tm * tmp; 900 struct tm * gmtmp; 901 struct tm tm, gmtm; 902 903 (void) printf("%-*s ", (int) longest, zone); 904 if (v) { 905 gmtmp = my_gmtime_r(&t, &gmtm); 906 if (gmtmp == NULL) { 907 printf(tformat(), t); 908 } else { 909 dumptime(gmtmp); 910 (void) printf(" UT"); 911 } 912 (void) printf(" = "); 913 } 914 tmp = my_localtime_rz(tz, &t, &tm); 915 dumptime(tmp); 916 if (tmp != NULL) { 917 if (*abbr(tmp) != '\0') 918 (void) printf(" %s", abbr(tmp)); 919 if (v) { 920 long off = gmtoff(tmp, gmtmp); 921 (void) printf(" isdst=%d", tmp->tm_isdst); 922 if (off != LONG_MIN) 923 (void) printf(" gmtoff=%ld", off); 924 } 925 } 926 (void) printf("\n"); 927 if (tmp != NULL && *abbr(tmp) != '\0') 928 abbrok(abbr(tmp), zone); 929 } 930 931 static const char * 932 abbr(struct tm const *tmp) 933 { 934 #ifdef TM_ZONE 935 return tmp->TM_ZONE; 936 #else 937 return (0 <= tmp->tm_isdst && tzname[0 < tmp->tm_isdst] 938 ? tzname[0 < tmp->tm_isdst] 939 : ""); 940 #endif 941 } 942 943 /* 944 ** The code below can fail on certain theoretical systems; 945 ** it works on all known real-world systems as of 2004-12-30. 946 */ 947 948 static const char * 949 tformat(void) 950 { 951 if (0 > (time_t) -1) { /* signed */ 952 if (sizeof (time_t) == sizeof (intmax_t)) 953 return "%"PRIdMAX; 954 if (sizeof (time_t) > sizeof (long)) 955 return "%lld"; 956 if (sizeof (time_t) > sizeof (int)) 957 return "%ld"; 958 return "%d"; 959 } 960 #ifdef PRIuMAX 961 if (sizeof (time_t) == sizeof (uintmax_t)) 962 return "%"PRIuMAX; 963 #endif 964 if (sizeof (time_t) > sizeof (unsigned long)) 965 return "%llu"; 966 if (sizeof (time_t) > sizeof (unsigned int)) 967 return "%lu"; 968 return "%u"; 969 } 970 971 static void 972 dumptime(const struct tm *timeptr) 973 { 974 static const char wday_name[][3] = { 975 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 976 }; 977 static const char mon_name[][3] = { 978 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 979 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 980 }; 981 const char * wn; 982 const char * mn; 983 int lead; 984 int trail; 985 986 if (timeptr == NULL) { 987 printf("NULL"); 988 return; 989 } 990 /* 991 ** The packaged localtime_rz and gmtime_r never put out-of-range 992 ** values in tm_wday or tm_mon, but since this code might be compiled 993 ** with other (perhaps experimental) versions, paranoia is in order. 994 */ 995 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= 996 (int) (sizeof wday_name / sizeof wday_name[0])) 997 wn = "???"; 998 else wn = wday_name[timeptr->tm_wday]; 999 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= 1000 (int) (sizeof mon_name / sizeof mon_name[0])) 1001 mn = "???"; 1002 else mn = mon_name[timeptr->tm_mon]; 1003 printf("%.3s %.3s%3d %.2d:%.2d:%.2d ", 1004 wn, mn, 1005 timeptr->tm_mday, timeptr->tm_hour, 1006 timeptr->tm_min, timeptr->tm_sec); 1007 #define DIVISOR 10 1008 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR; 1009 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR + 1010 trail / DIVISOR; 1011 trail %= DIVISOR; 1012 if (trail < 0 && lead > 0) { 1013 trail += DIVISOR; 1014 --lead; 1015 } else if (lead < 0 && trail > 0) { 1016 trail -= DIVISOR; 1017 ++lead; 1018 } 1019 if (lead == 0) 1020 printf("%d", trail); 1021 else printf("%d%d", lead, ((trail < 0) ? -trail : trail)); 1022 } 1023
Indexes created Sat Sep 20 22:09:52 GMT 2025