1/* $NetBSD: zdump.c,v 1.23 2011/09/04 13:25:22 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#ifndef NOID 10__RCSID("$NetBSD: zdump.c,v 1.23 2011/09/04 13:25:22 christos Exp $"); 11#endif /* !defined NOID */ 12#endif /* !defined lint */ 13 14static char elsieid[] = "@(#)zdump.c 8.10"; 15 16/* 17** This code has been made independent of the rest of the time 18** conversion package to increase confidence in the verification it provides. 19** You can use this code to help in verifying other implementations. 20*/ 21 22#include "stdio.h" /* for stdout, stderr */ 23#include "string.h" /* for strcpy */ 24#include "sys/types.h" /* for time_t */ 25#include "time.h" /* for struct tm */ 26#include "stdlib.h" /* for exit, malloc, atoi */ 27#include <err.h> 28#include "float.h" /* for FLT_MAX and DBL_MAX */ 29#include "ctype.h" /* for isalpha et al. */ 30#ifndef isascii 31#define isascii(x) 1 32#endif /* !defined isascii */ 33 34#ifndef ZDUMP_LO_YEAR 35#define ZDUMP_LO_YEAR (-500) 36#endif /* !defined ZDUMP_LO_YEAR */ 37 38#ifndef ZDUMP_HI_YEAR 39#define ZDUMP_HI_YEAR 2500 40#endif /* !defined ZDUMP_HI_YEAR */ 41 42#ifndef MAX_STRING_LENGTH 43#define MAX_STRING_LENGTH 1024 44#endif /* !defined MAX_STRING_LENGTH */ 45 46#ifndef TRUE 47#define TRUE 1 48#endif /* !defined TRUE */ 49 50#ifndef FALSE 51#define FALSE 0 52#endif /* !defined FALSE */ 53 54#ifndef EXIT_SUCCESS 55#define EXIT_SUCCESS 0 56#endif /* !defined EXIT_SUCCESS */ 57 58#ifndef EXIT_FAILURE 59#define EXIT_FAILURE 1 60#endif /* !defined EXIT_FAILURE */ 61 62#ifndef SECSPERMIN 63#define SECSPERMIN 60 64#endif /* !defined SECSPERMIN */ 65 66#ifndef MINSPERHOUR 67#define MINSPERHOUR 60 68#endif /* !defined MINSPERHOUR */ 69 70#ifndef SECSPERHOUR 71#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 72#endif /* !defined SECSPERHOUR */ 73 74#ifndef HOURSPERDAY 75#define HOURSPERDAY 24 76#endif /* !defined HOURSPERDAY */ 77 78#ifndef EPOCH_YEAR 79#define EPOCH_YEAR 1970 80#endif /* !defined EPOCH_YEAR */ 81 82#ifndef TM_YEAR_BASE 83#define TM_YEAR_BASE 1900 84#endif /* !defined TM_YEAR_BASE */ 85 86#ifndef DAYSPERNYEAR 87#define DAYSPERNYEAR 365 88#endif /* !defined DAYSPERNYEAR */ 89 90#ifndef isleap 91#define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 92#endif /* !defined isleap */ 93 94#ifndef isleap_sum 95/* 96** See tzfile.h for details on isleap_sum. 97*/ 98#define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 99#endif /* !defined isleap_sum */ 100 101#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 102#define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR) 103#define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY) 104 105#ifndef HAVE_GETTEXT 106#define HAVE_GETTEXT 0 107#endif 108#if HAVE_GETTEXT 109#include "locale.h" /* for setlocale */ 110#include "libintl.h" 111#endif /* HAVE_GETTEXT */ 112 113#ifndef GNUC_or_lint 114#ifdef lint 115#define GNUC_or_lint 116#else /* !defined lint */ 117#ifdef __GNUC__ 118#define GNUC_or_lint 119#endif /* defined __GNUC__ */ 120#endif /* !defined lint */ 121#endif /* !defined GNUC_or_lint */ 122 123#ifndef INITIALIZE 124#ifdef GNUC_or_lint 125#define INITIALIZE(x) ((x) = 0) 126#else /* !defined GNUC_or_lint */ 127#define INITIALIZE(x) 128#endif /* !defined GNUC_or_lint */ 129#endif /* !defined INITIALIZE */ 130 131/* 132** For the benefit of GNU folk... 133** `_(MSGID)' uses the current locale's message library string for MSGID. 134** The default is to use gettext if available, and use MSGID otherwise. 135*/ 136 137#ifndef _ 138#if HAVE_GETTEXT 139#define _(msgid) gettext(msgid) 140#else /* !HAVE_GETTEXT */ 141#define _(msgid) msgid 142#endif /* !HAVE_GETTEXT */ 143#endif /* !defined _ */ 144 145#ifndef TZ_DOMAIN 146#define TZ_DOMAIN "tz" 147#endif /* !defined TZ_DOMAIN */ 148 149extern char ** environ; 150extern int getopt(int argc, char * const argv[], 151 const char * options); 152extern char * optarg; 153extern int optind; 154 155static time_t absolute_min_time; 156static time_t absolute_max_time; 157static size_t longest; 158static char * progname; 159static int warned; 160 161static const char * abbr(struct tm * tmp); 162static void abbrok(const char * abbrp, const char * zone); 163static long delta(struct tm * newp, struct tm * oldp); 164static void dumptime(const struct tm * tmp); 165static time_t hunt(char * name, time_t lot, time_t hit); 166int main(int, char **); 167static void setabsolutes(void); 168static void show(char * zone, time_t t, int v); 169static const char * tformat(void); 170static time_t yeartot(long y); 171 172#ifndef TYPECHECK 173#define my_localtime localtime 174#else /* !defined TYPECHECK */ 175static struct tm * 176my_localtime(tp) 177time_t * tp; 178{ 179 register struct tm * tmp; 180 181 tmp = localtime(tp); 182 if (tp != NULL && tmp != NULL) { 183 struct tm tm; 184 register time_t t; 185 186 tm = *tmp; 187 t = mktime(&tm); 188 if (t - *tp >= 1 || *tp - t >= 1) { 189 (void) fflush(stdout); 190 (void) fprintf(stderr, "\n%s: ", progname); 191 (void) fprintf(stderr, tformat(), *tp); 192 (void) fprintf(stderr, " ->"); 193 (void) fprintf(stderr, " year=%d", tmp->tm_year); 194 (void) fprintf(stderr, " mon=%d", tmp->tm_mon); 195 (void) fprintf(stderr, " mday=%d", tmp->tm_mday); 196 (void) fprintf(stderr, " hour=%d", tmp->tm_hour); 197 (void) fprintf(stderr, " min=%d", tmp->tm_min); 198 (void) fprintf(stderr, " sec=%d", tmp->tm_sec); 199 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst); 200 (void) fprintf(stderr, " -> "); 201 (void) fprintf(stderr, tformat(), t); 202 (void) fprintf(stderr, "\n"); 203 } 204 } 205 return tmp; 206} 207#endif /* !defined TYPECHECK */ 208 209static void 210abbrok(abbrp, zone) 211const char * const abbrp; 212const char * const zone; 213{ 214 register const char * cp; 215 register const char * wp; 216 217 if (warned) 218 return; 219 cp = abbrp; 220 wp = NULL; 221 while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp)) 222 ++cp; 223 if (cp - abbrp == 0) 224 wp = _("lacks alphabetic at start"); 225 else if (cp - abbrp < 3) 226 wp = _("has fewer than 3 alphabetics"); 227 else if (cp - abbrp > 6) 228 wp = _("has more than 6 alphabetics"); 229 if (wp == NULL && (*cp == '+' || *cp == '-')) { 230 ++cp; 231 if (isascii((unsigned char) *cp) && 232 isdigit((unsigned char) *cp)) 233 if (*cp++ == '1' && *cp >= '0' && *cp <= '4') 234 ++cp; 235 if (*cp != '\0') 236 wp = _("differs from POSIX standard"); 237 } 238 if (wp == NULL) 239 return; 240 (void) fflush(stdout); 241 (void) fprintf(stderr, 242 _("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"), 243 progname, zone, abbrp, wp); 244 warned = TRUE; 245} 246 247__dead static void 248usage(FILE *stream, int status) 249{ 250 (void) fprintf(stream, 251_("%s: usage is %s [ --version ] [ --help ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n\ 252\n\ 253Report bugs to tz@elsie.nci.nih.gov.\n"), 254 progname, progname); 255 exit(status); 256} 257 258int 259main(argc, argv) 260int argc; 261char * argv[]; 262{ 263 register int i; 264 register int c; 265 register int vflag; 266 register char * cutarg; 267 register long cutloyear = ZDUMP_LO_YEAR; 268 register long cuthiyear = ZDUMP_HI_YEAR; 269 register time_t cutlotime; 270 register time_t cuthitime; 271 register char ** fakeenv; 272 time_t now; 273 time_t t; 274 time_t newt; 275 struct tm tm; 276 struct tm newtm; 277 register struct tm * tmp; 278 register struct tm * newtmp; 279 280 INITIALIZE(cutlotime); 281 INITIALIZE(cuthitime); 282#if HAVE_GETTEXT 283 (void) setlocale(LC_ALL, ""); 284#ifdef TZ_DOMAINDIR 285 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR); 286#endif /* defined TEXTDOMAINDIR */ 287 (void) textdomain(TZ_DOMAIN); 288#endif /* HAVE_GETTEXT */ 289 progname = argv[0]; 290 for (i = 1; i < argc; ++i) 291 if (strcmp(argv[i], "--version") == 0) { 292 (void) printf("%s\n", elsieid); 293 exit(EXIT_SUCCESS); 294 } else if (strcmp(argv[i], "--help") == 0) { 295 usage(stdout, EXIT_SUCCESS); 296 } 297 vflag = 0; 298 cutarg = NULL; 299 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v') 300 if (c == 'v') 301 vflag = 1; 302 else cutarg = optarg; 303 if ((c != EOF && c != -1) || 304 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) { 305 usage(stderr, EXIT_FAILURE); 306 } 307 if (vflag) { 308 if (cutarg != NULL) { 309 long lo; 310 long hi; 311 char dummy; 312 313 if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) { 314 cuthiyear = hi; 315 } else if (sscanf(cutarg, "%ld,%ld%c", 316 &lo, &hi, &dummy) == 2) { 317 cutloyear = lo; 318 cuthiyear = hi; 319 } else { 320(void) fprintf(stderr, _("%s: wild -c argument %s\n"), 321 progname, cutarg); 322 exit(EXIT_FAILURE); 323 } 324 } 325 setabsolutes(); 326 cutlotime = yeartot(cutloyear); 327 cuthitime = yeartot(cuthiyear); 328 } 329 (void) time(&now); 330 longest = 0; 331 for (i = optind; i < argc; ++i) 332 if (strlen(argv[i]) > longest) 333 longest = strlen(argv[i]); 334 { 335 register int from; 336 register int to; 337 338 for (i = 0; environ[i] != NULL; ++i) 339 continue; 340 fakeenv = (char **) malloc((size_t) ((i + 2) * 341 sizeof *fakeenv)); 342 if (fakeenv == NULL || 343 (fakeenv[0] = (char *) malloc(longest + 4)) == NULL) { 344 err(EXIT_FAILURE, "Can't allocated %zu bytes", 345 longest + 4); 346 } 347 to = 0; 348 (void)strcpy(fakeenv[to++], "TZ="); /* XXX strcpy is safe */ 349 for (from = 0; environ[from] != NULL; ++from) 350 if (strncmp(environ[from], "TZ=", 3) != 0) 351 fakeenv[to++] = environ[from]; 352 fakeenv[to] = NULL; 353 environ = fakeenv; 354 } 355 for (i = optind; i < argc; ++i) { 356 static char buf[MAX_STRING_LENGTH]; 357 358 (void) strcpy(&fakeenv[0][3], argv[i]); /* XXX strcpy is safe */ 359 if (!vflag) { 360 show(argv[i], now, FALSE); 361 continue; 362 } 363 warned = FALSE; 364 t = absolute_min_time; 365 show(argv[i], t, TRUE); 366 t += SECSPERHOUR * HOURSPERDAY; 367 show(argv[i], t, TRUE); 368 if (t < cutlotime) 369 t = cutlotime; 370 tmp = my_localtime(&t); 371 if (tmp != NULL) { 372 tm = *tmp; 373 (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); 374 } 375 for ( ; ; ) { 376 if (t >= cuthitime || t >= cuthitime - SECSPERHOUR * 12) 377 break; 378 newt = t + SECSPERHOUR * 12; 379 newtmp = localtime(&newt); 380 if (newtmp != NULL) 381 newtm = *newtmp; 382 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) : 383 (delta(&newtm, &tm) != (newt - t) || 384 newtm.tm_isdst != tm.tm_isdst || 385 strcmp(abbr(&newtm), buf) != 0)) { 386 newt = hunt(argv[i], t, newt); 387 newtmp = localtime(&newt); 388 if (newtmp != NULL) { 389 newtm = *newtmp; 390 (void) strncpy(buf, 391 abbr(&newtm), 392 (sizeof buf) - 1); 393 } 394 } 395 t = newt; 396 tm = newtm; 397 tmp = newtmp; 398 } 399 t = absolute_max_time; 400 t -= SECSPERHOUR * HOURSPERDAY; 401 show(argv[i], t, TRUE); 402 t += SECSPERHOUR * HOURSPERDAY; 403 show(argv[i], t, TRUE); 404 } 405 if (fflush(stdout) || ferror(stdout)) { 406 err(EXIT_FAILURE, _("Error writing standard output")); 407 } 408 exit(EXIT_SUCCESS); 409 /* If exit fails to exit... */ 410 return EXIT_FAILURE; 411} 412 413static time_t 414ovfl_check(time_t t) 415{ 416 if (t < 0 && t - 1 >= 0) 417 return t; 418 else 419 return t - 1; 420} 421 422static void 423setabsolutes(void) 424{ 425 if (0.5 == (time_t) 0.5) { 426 /* 427 ** time_t is floating. 428 */ 429 if (sizeof (time_t) == sizeof (float)) { 430 absolute_min_time = (time_t) -FLT_MAX; 431 absolute_max_time = (time_t) FLT_MAX; 432 } else if (sizeof (time_t) == sizeof (double)) { 433 absolute_min_time = (time_t) -DBL_MAX; 434 absolute_max_time = (time_t) DBL_MAX; 435 } else { 436 (void) fprintf(stderr, 437_("%s: use of -v on system with floating time_t other than float or double\n"), 438 progname); 439 exit(EXIT_FAILURE); 440 } 441 } else if (0 > (time_t) -1) { 442 /* 443 ** time_t is signed. Assume overflow wraps around. 444 */ 445 time_t t = 0; 446 time_t t1 = 1; 447 448 while (t < t1) { 449 t = t1; 450 t1 = 2 * t1 + 1; 451 } 452 453 absolute_max_time = t; 454 t = -t; 455 absolute_min_time = ovfl_check(t); 456 } else { 457 /* 458 ** time_t is unsigned. 459 */ 460 absolute_min_time = 0; 461 absolute_max_time = absolute_min_time - 1; 462 } 463} 464 465static time_t 466yeartot(y) 467const long y; 468{ 469 register long myy; 470 register long seconds; 471 register time_t t; 472 473 myy = EPOCH_YEAR; 474 t = 0; 475 while (myy != y) { 476 if (myy < y) { 477 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR; 478 ++myy; 479 if (t > absolute_max_time - seconds) { 480 t = absolute_max_time; 481 break; 482 } 483 t += seconds; 484 } else { 485 --myy; 486 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR; 487 if (t < absolute_min_time + seconds) { 488 t = absolute_min_time; 489 break; 490 } 491 t -= seconds; 492 } 493 } 494 return t; 495} 496 497static time_t 498hunt(char *name, time_t lot, time_t hit) 499{ 500 time_t t; 501 long diff; 502 struct tm lotm; 503 register struct tm * lotmp; 504 struct tm tm; 505 register struct tm * tmp; 506 char loab[MAX_STRING_LENGTH]; 507 508 lotmp = my_localtime(&lot); 509 if (lotmp != NULL) { 510 lotm = *lotmp; 511 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); 512 } 513 for ( ; ; ) { 514 diff = (long) (hit - lot); 515 if (diff < 2) 516 break; 517 t = lot; 518 t += diff / 2; 519 if (t <= lot) 520 ++t; 521 else if (t >= hit) 522 --t; 523 tmp = my_localtime(&t); 524 if (tmp != NULL) 525 tm = *tmp; 526 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) : 527 (delta(&tm, &lotm) == (t - lot) && 528 tm.tm_isdst == lotm.tm_isdst && 529 strcmp(abbr(&tm), loab) == 0)) { 530 lot = t; 531 lotm = tm; 532 lotmp = tmp; 533 } else hit = t; 534 } 535 show(name, lot, TRUE); 536 show(name, hit, TRUE); 537 return hit; 538} 539 540/* 541** Thanks to Paul Eggert for logic used in delta. 542*/ 543 544static long 545delta(newp, oldp) 546struct tm * newp; 547struct tm * oldp; 548{ 549 register long result; 550 register int tmy; 551 552 if (newp->tm_year < oldp->tm_year) 553 return -delta(oldp, newp); 554 result = 0; 555 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy) 556 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE); 557 result += newp->tm_yday - oldp->tm_yday; 558 result *= HOURSPERDAY; 559 result += newp->tm_hour - oldp->tm_hour; 560 result *= MINSPERHOUR; 561 result += newp->tm_min - oldp->tm_min; 562 result *= SECSPERMIN; 563 result += newp->tm_sec - oldp->tm_sec; 564 return result; 565} 566 567static void 568show(char *zone, time_t t, int v) 569{ 570 register struct tm * tmp; 571 572 (void) printf("%-*s ", (int) longest, zone); 573 if (v) { 574 tmp = gmtime(&t); 575 if (tmp == NULL) { 576 (void) printf(tformat(), t); 577 } else { 578 dumptime(tmp); 579 (void) printf(" UTC"); 580 } 581 (void) printf(" = "); 582 } 583 tmp = my_localtime(&t); 584 dumptime(tmp); 585 if (tmp != NULL) { 586 if (*abbr(tmp) != '\0') 587 (void) printf(" %s", abbr(tmp)); 588 if (v) { 589 (void) printf(" isdst=%d", tmp->tm_isdst); 590#ifdef TM_GMTOFF 591 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF); 592#endif /* defined TM_GMTOFF */ 593 } 594 } 595 (void) printf("\n"); 596 if (tmp != NULL && *abbr(tmp) != '\0') 597 abbrok(abbr(tmp), zone); 598} 599 600static const char * 601abbr(tmp) 602struct tm * tmp; 603{ 604 register const char * result; 605 static const char nada; 606 607 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1) 608 return &nada; 609 result = tzname[tmp->tm_isdst]; 610 return (result == NULL) ? &nada : result; 611} 612 613/* 614** The code below can fail on certain theoretical systems; 615** it works on all known real-world systems as of 2004-12-30. 616*/ 617 618static const char * 619tformat(void) 620{ 621 if (0.5 == (time_t) 0.5) { /* floating */ 622 if (sizeof (time_t) > sizeof (double)) 623 return "%Lg"; 624 return "%g"; 625 } 626 if (0 > (time_t) -1) { /* signed */ 627 if (sizeof (time_t) > sizeof (long)) 628 return "%lld"; 629 if (sizeof (time_t) > sizeof (int)) 630 return "%ld"; 631 return "%d"; 632 } 633 if (sizeof (time_t) > sizeof (unsigned long)) 634 return "%llu"; 635 if (sizeof (time_t) > sizeof (unsigned int)) 636 return "%lu"; 637 return "%u"; 638} 639 640static void 641dumptime(timeptr) 642register const struct tm * timeptr; 643{ 644 static const char wday_name[][3] = { 645 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 646 }; 647 static const char mon_name[][3] = { 648 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 649 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 650 }; 651 register const char * wn; 652 register const char * mn; 653 register int lead; 654 register int trail; 655 656 if (timeptr == NULL) { 657 (void) printf("NULL"); 658 return; 659 } 660 /* 661 ** The packaged versions of localtime and gmtime never put out-of-range 662 ** values in tm_wday or tm_mon, but since this code might be compiled 663 ** with other (perhaps experimental) versions, paranoia is in order. 664 */ 665 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= 666 (int) (sizeof wday_name / sizeof wday_name[0])) 667 wn = "???"; 668 else wn = wday_name[timeptr->tm_wday]; 669 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= 670 (int) (sizeof mon_name / sizeof mon_name[0])) 671 mn = "???"; 672 else mn = mon_name[timeptr->tm_mon]; 673 (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ", 674 wn, mn, 675 timeptr->tm_mday, timeptr->tm_hour, 676 timeptr->tm_min, timeptr->tm_sec); 677#define DIVISOR 10 678 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR; 679 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR + 680 trail / DIVISOR; 681 trail %= DIVISOR; 682 if (trail < 0 && lead > 0) { 683 trail += DIVISOR; 684 --lead; 685 } else if (lead < 0 && trail > 0) { 686 trail -= DIVISOR; 687 ++lead; 688 } 689 if (lead == 0) 690 (void) printf("%d", trail); 691 else (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail)); 692} 693