zdump.c revision 1.1.1.8
1 /* 2 ** This file is in the public domain, so clarified as of 3 ** 2009-05-17 by Arthur David Olson. 4 */ 5 6 static char elsieid[] = "@(#)zdump.c 8.9"; 7 8 /* 9 ** This code has been made independent of the rest of the time 10 ** conversion package to increase confidence in the verification it provides. 11 ** You can use this code to help in verifying other implementations. 12 */ 13 14 #include "stdio.h" /* for stdout, stderr, perror */ 15 #include "string.h" /* for strcpy */ 16 #include "sys/types.h" /* for time_t */ 17 #include "time.h" /* for struct tm */ 18 #include "stdlib.h" /* for exit, malloc, atoi */ 19 #include "float.h" /* for FLT_MAX and DBL_MAX */ 20 #include "ctype.h" /* for isalpha et al. */ 21 #ifndef isascii 22 #define isascii(x) 1 23 #endif /* !defined isascii */ 24 25 #ifndef ZDUMP_LO_YEAR 26 #define ZDUMP_LO_YEAR (-500) 27 #endif /* !defined ZDUMP_LO_YEAR */ 28 29 #ifndef ZDUMP_HI_YEAR 30 #define ZDUMP_HI_YEAR 2500 31 #endif /* !defined ZDUMP_HI_YEAR */ 32 33 #ifndef MAX_STRING_LENGTH 34 #define MAX_STRING_LENGTH 1024 35 #endif /* !defined MAX_STRING_LENGTH */ 36 37 #ifndef TRUE 38 #define TRUE 1 39 #endif /* !defined TRUE */ 40 41 #ifndef FALSE 42 #define FALSE 0 43 #endif /* !defined FALSE */ 44 45 #ifndef EXIT_SUCCESS 46 #define EXIT_SUCCESS 0 47 #endif /* !defined EXIT_SUCCESS */ 48 49 #ifndef EXIT_FAILURE 50 #define EXIT_FAILURE 1 51 #endif /* !defined EXIT_FAILURE */ 52 53 #ifndef SECSPERMIN 54 #define SECSPERMIN 60 55 #endif /* !defined SECSPERMIN */ 56 57 #ifndef MINSPERHOUR 58 #define MINSPERHOUR 60 59 #endif /* !defined MINSPERHOUR */ 60 61 #ifndef SECSPERHOUR 62 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 63 #endif /* !defined SECSPERHOUR */ 64 65 #ifndef HOURSPERDAY 66 #define HOURSPERDAY 24 67 #endif /* !defined HOURSPERDAY */ 68 69 #ifndef EPOCH_YEAR 70 #define EPOCH_YEAR 1970 71 #endif /* !defined EPOCH_YEAR */ 72 73 #ifndef TM_YEAR_BASE 74 #define TM_YEAR_BASE 1900 75 #endif /* !defined TM_YEAR_BASE */ 76 77 #ifndef DAYSPERNYEAR 78 #define DAYSPERNYEAR 365 79 #endif /* !defined DAYSPERNYEAR */ 80 81 #ifndef isleap 82 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 83 #endif /* !defined isleap */ 84 85 #ifndef isleap_sum 86 /* 87 ** See tzfile.h for details on isleap_sum. 88 */ 89 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 90 #endif /* !defined isleap_sum */ 91 92 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 93 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR) 94 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY) 95 96 #ifndef HAVE_GETTEXT 97 #define HAVE_GETTEXT 0 98 #endif 99 #if HAVE_GETTEXT 100 #include "locale.h" /* for setlocale */ 101 #include "libintl.h" 102 #endif /* HAVE_GETTEXT */ 103 104 #ifndef GNUC_or_lint 105 #ifdef lint 106 #define GNUC_or_lint 107 #else /* !defined lint */ 108 #ifdef __GNUC__ 109 #define GNUC_or_lint 110 #endif /* defined __GNUC__ */ 111 #endif /* !defined lint */ 112 #endif /* !defined GNUC_or_lint */ 113 114 #ifndef INITIALIZE 115 #ifdef GNUC_or_lint 116 #define INITIALIZE(x) ((x) = 0) 117 #else /* !defined GNUC_or_lint */ 118 #define INITIALIZE(x) 119 #endif /* !defined GNUC_or_lint */ 120 #endif /* !defined INITIALIZE */ 121 122 /* 123 ** For the benefit of GNU folk... 124 ** `_(MSGID)' uses the current locale's message library string for MSGID. 125 ** The default is to use gettext if available, and use MSGID otherwise. 126 */ 127 128 #ifndef _ 129 #if HAVE_GETTEXT 130 #define _(msgid) gettext(msgid) 131 #else /* !HAVE_GETTEXT */ 132 #define _(msgid) msgid 133 #endif /* !HAVE_GETTEXT */ 134 #endif /* !defined _ */ 135 136 #ifndef TZ_DOMAIN 137 #define TZ_DOMAIN "tz" 138 #endif /* !defined TZ_DOMAIN */ 139 140 extern char ** environ; 141 extern int getopt(int argc, char * const argv[], 142 const char * options); 143 extern char * optarg; 144 extern int optind; 145 extern char * tzname[2]; 146 147 static time_t absolute_min_time; 148 static time_t absolute_max_time; 149 static size_t longest; 150 static char * progname; 151 static int warned; 152 153 static char * abbr(struct tm * tmp); 154 static void abbrok(const char * abbrp, const char * zone); 155 static long delta(struct tm * newp, struct tm * oldp); 156 static void dumptime(const struct tm * tmp); 157 static time_t hunt(char * name, time_t lot, time_t hit); 158 static void setabsolutes(void); 159 static void show(char * zone, time_t t, int v); 160 static const char * tformat(void); 161 static time_t yeartot(long y); 162 163 #ifndef TYPECHECK 164 #define my_localtime localtime 165 #else /* !defined TYPECHECK */ 166 static struct tm * 167 my_localtime(tp) 168 time_t * tp; 169 { 170 register struct tm * tmp; 171 172 tmp = localtime(tp); 173 if (tp != NULL && tmp != NULL) { 174 struct tm tm; 175 register time_t t; 176 177 tm = *tmp; 178 t = mktime(&tm); 179 if (t - *tp >= 1 || *tp - t >= 1) { 180 (void) fflush(stdout); 181 (void) fprintf(stderr, "\n%s: ", progname); 182 (void) fprintf(stderr, tformat(), *tp); 183 (void) fprintf(stderr, " ->"); 184 (void) fprintf(stderr, " year=%d", tmp->tm_year); 185 (void) fprintf(stderr, " mon=%d", tmp->tm_mon); 186 (void) fprintf(stderr, " mday=%d", tmp->tm_mday); 187 (void) fprintf(stderr, " hour=%d", tmp->tm_hour); 188 (void) fprintf(stderr, " min=%d", tmp->tm_min); 189 (void) fprintf(stderr, " sec=%d", tmp->tm_sec); 190 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst); 191 (void) fprintf(stderr, " -> "); 192 (void) fprintf(stderr, tformat(), t); 193 (void) fprintf(stderr, "\n"); 194 } 195 } 196 return tmp; 197 } 198 #endif /* !defined TYPECHECK */ 199 200 static void 201 abbrok(abbrp, zone) 202 const char * const abbrp; 203 const char * const zone; 204 { 205 register const char * cp; 206 register char * wp; 207 208 if (warned) 209 return; 210 cp = abbrp; 211 wp = NULL; 212 while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp)) 213 ++cp; 214 if (cp - abbrp == 0) 215 wp = _("lacks alphabetic at start"); 216 else if (cp - abbrp < 3) 217 wp = _("has fewer than 3 alphabetics"); 218 else if (cp - abbrp > 6) 219 wp = _("has more than 6 alphabetics"); 220 if (wp == NULL && (*cp == '+' || *cp == '-')) { 221 ++cp; 222 if (isascii((unsigned char) *cp) && 223 isdigit((unsigned char) *cp)) 224 if (*cp++ == '1' && *cp >= '0' && *cp <= '4') 225 ++cp; 226 if (*cp != '\0') 227 wp = _("differs from POSIX standard"); 228 } 229 if (wp == NULL) 230 return; 231 (void) fflush(stdout); 232 (void) fprintf(stderr, 233 _("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"), 234 progname, zone, abbrp, wp); 235 warned = TRUE; 236 } 237 238 static void 239 usage(const char *progname, FILE *stream, int status) 240 { 241 (void) fprintf(stream, 242 _("%s: usage is %s [ --version ] [ --help ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n\ 243 \n\ 244 Report bugs to tz (at) elsie.nci.nih.gov.\n"), 245 progname, progname); 246 exit(status); 247 } 248 249 int 250 main(argc, argv) 251 int argc; 252 char * argv[]; 253 { 254 register int i; 255 register int c; 256 register int vflag; 257 register char * cutarg; 258 register long cutloyear = ZDUMP_LO_YEAR; 259 register long cuthiyear = ZDUMP_HI_YEAR; 260 register time_t cutlotime; 261 register time_t cuthitime; 262 register char ** fakeenv; 263 time_t now; 264 time_t t; 265 time_t newt; 266 struct tm tm; 267 struct tm newtm; 268 register struct tm * tmp; 269 register struct tm * newtmp; 270 271 INITIALIZE(cutlotime); 272 INITIALIZE(cuthitime); 273 #if HAVE_GETTEXT 274 (void) setlocale(LC_ALL, ""); 275 #ifdef TZ_DOMAINDIR 276 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR); 277 #endif /* defined TEXTDOMAINDIR */ 278 (void) textdomain(TZ_DOMAIN); 279 #endif /* HAVE_GETTEXT */ 280 progname = argv[0]; 281 for (i = 1; i < argc; ++i) 282 if (strcmp(argv[i], "--version") == 0) { 283 (void) printf("%s\n", elsieid); 284 exit(EXIT_SUCCESS); 285 } else if (strcmp(argv[i], "--help") == 0) { 286 usage(progname, stdout, EXIT_SUCCESS); 287 } 288 vflag = 0; 289 cutarg = NULL; 290 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v') 291 if (c == 'v') 292 vflag = 1; 293 else cutarg = optarg; 294 if ((c != EOF && c != -1) || 295 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) { 296 usage(progname, stderr, EXIT_FAILURE); 297 } 298 if (vflag) { 299 if (cutarg != NULL) { 300 long lo; 301 long hi; 302 char dummy; 303 304 if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) { 305 cuthiyear = hi; 306 } else if (sscanf(cutarg, "%ld,%ld%c", 307 &lo, &hi, &dummy) == 2) { 308 cutloyear = lo; 309 cuthiyear = hi; 310 } else { 311 (void) fprintf(stderr, _("%s: wild -c argument %s\n"), 312 progname, cutarg); 313 exit(EXIT_FAILURE); 314 } 315 } 316 setabsolutes(); 317 cutlotime = yeartot(cutloyear); 318 cuthitime = yeartot(cuthiyear); 319 } 320 (void) time(&now); 321 longest = 0; 322 for (i = optind; i < argc; ++i) 323 if (strlen(argv[i]) > longest) 324 longest = strlen(argv[i]); 325 { 326 register int from; 327 register int to; 328 329 for (i = 0; environ[i] != NULL; ++i) 330 continue; 331 fakeenv = (char **) malloc((size_t) ((i + 2) * 332 sizeof *fakeenv)); 333 if (fakeenv == NULL || 334 (fakeenv[0] = (char *) malloc(longest + 4)) == NULL) { 335 (void) perror(progname); 336 exit(EXIT_FAILURE); 337 } 338 to = 0; 339 (void) strcpy(fakeenv[to++], "TZ="); 340 for (from = 0; environ[from] != NULL; ++from) 341 if (strncmp(environ[from], "TZ=", 3) != 0) 342 fakeenv[to++] = environ[from]; 343 fakeenv[to] = NULL; 344 environ = fakeenv; 345 } 346 for (i = optind; i < argc; ++i) { 347 static char buf[MAX_STRING_LENGTH]; 348 349 (void) strcpy(&fakeenv[0][3], argv[i]); 350 if (!vflag) { 351 show(argv[i], now, FALSE); 352 continue; 353 } 354 warned = FALSE; 355 t = absolute_min_time; 356 show(argv[i], t, TRUE); 357 t += SECSPERHOUR * HOURSPERDAY; 358 show(argv[i], t, TRUE); 359 if (t < cutlotime) 360 t = cutlotime; 361 tmp = my_localtime(&t); 362 if (tmp != NULL) { 363 tm = *tmp; 364 (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); 365 } 366 for ( ; ; ) { 367 if (t >= cuthitime || t >= cuthitime - SECSPERHOUR * 12) 368 break; 369 newt = t + SECSPERHOUR * 12; 370 newtmp = localtime(&newt); 371 if (newtmp != NULL) 372 newtm = *newtmp; 373 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) : 374 (delta(&newtm, &tm) != (newt - t) || 375 newtm.tm_isdst != tm.tm_isdst || 376 strcmp(abbr(&newtm), buf) != 0)) { 377 newt = hunt(argv[i], t, newt); 378 newtmp = localtime(&newt); 379 if (newtmp != NULL) { 380 newtm = *newtmp; 381 (void) strncpy(buf, 382 abbr(&newtm), 383 (sizeof buf) - 1); 384 } 385 } 386 t = newt; 387 tm = newtm; 388 tmp = newtmp; 389 } 390 t = absolute_max_time; 391 t -= SECSPERHOUR * HOURSPERDAY; 392 show(argv[i], t, TRUE); 393 t += SECSPERHOUR * HOURSPERDAY; 394 show(argv[i], t, TRUE); 395 } 396 if (fflush(stdout) || ferror(stdout)) { 397 (void) fprintf(stderr, "%s: ", progname); 398 (void) perror(_("Error writing to standard output")); 399 exit(EXIT_FAILURE); 400 } 401 exit(EXIT_SUCCESS); 402 /* If exit fails to exit... */ 403 return EXIT_FAILURE; 404 } 405 406 static void 407 setabsolutes(void) 408 { 409 if (0.5 == (time_t) 0.5) { 410 /* 411 ** time_t is floating. 412 */ 413 if (sizeof (time_t) == sizeof (float)) { 414 absolute_min_time = (time_t) -FLT_MAX; 415 absolute_max_time = (time_t) FLT_MAX; 416 } else if (sizeof (time_t) == sizeof (double)) { 417 absolute_min_time = (time_t) -DBL_MAX; 418 absolute_max_time = (time_t) DBL_MAX; 419 } else { 420 (void) fprintf(stderr, 421 _("%s: use of -v on system with floating time_t other than float or double\n"), 422 progname); 423 exit(EXIT_FAILURE); 424 } 425 } else if (0 > (time_t) -1) { 426 /* 427 ** time_t is signed. Assume overflow wraps around. 428 */ 429 time_t t = 0; 430 time_t t1 = 1; 431 432 while (t < t1) { 433 t = t1; 434 t1 = 2 * t1 + 1; 435 } 436 437 absolute_max_time = t; 438 t = -t; 439 absolute_min_time = t - 1; 440 if (t < absolute_min_time) 441 absolute_min_time = t; 442 } else { 443 /* 444 ** time_t is unsigned. 445 */ 446 absolute_min_time = 0; 447 absolute_max_time = absolute_min_time - 1; 448 } 449 } 450 451 static time_t 452 yeartot(y) 453 const long y; 454 { 455 register long myy; 456 register long seconds; 457 register time_t t; 458 459 myy = EPOCH_YEAR; 460 t = 0; 461 while (myy != y) { 462 if (myy < y) { 463 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR; 464 ++myy; 465 if (t > absolute_max_time - seconds) { 466 t = absolute_max_time; 467 break; 468 } 469 t += seconds; 470 } else { 471 --myy; 472 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR; 473 if (t < absolute_min_time + seconds) { 474 t = absolute_min_time; 475 break; 476 } 477 t -= seconds; 478 } 479 } 480 return t; 481 } 482 483 static time_t 484 hunt(char *name, time_t lot, time_t hit) 485 { 486 time_t t; 487 long diff; 488 struct tm lotm; 489 register struct tm * lotmp; 490 struct tm tm; 491 register struct tm * tmp; 492 char loab[MAX_STRING_LENGTH]; 493 494 lotmp = my_localtime(&lot); 495 if (lotmp != NULL) { 496 lotm = *lotmp; 497 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); 498 } 499 for ( ; ; ) { 500 diff = (long) (hit - lot); 501 if (diff < 2) 502 break; 503 t = lot; 504 t += diff / 2; 505 if (t <= lot) 506 ++t; 507 else if (t >= hit) 508 --t; 509 tmp = my_localtime(&t); 510 if (tmp != NULL) 511 tm = *tmp; 512 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) : 513 (delta(&tm, &lotm) == (t - lot) && 514 tm.tm_isdst == lotm.tm_isdst && 515 strcmp(abbr(&tm), loab) == 0)) { 516 lot = t; 517 lotm = tm; 518 lotmp = tmp; 519 } else hit = t; 520 } 521 show(name, lot, TRUE); 522 show(name, hit, TRUE); 523 return hit; 524 } 525 526 /* 527 ** Thanks to Paul Eggert for logic used in delta. 528 */ 529 530 static long 531 delta(newp, oldp) 532 struct tm * newp; 533 struct tm * oldp; 534 { 535 register long result; 536 register int tmy; 537 538 if (newp->tm_year < oldp->tm_year) 539 return -delta(oldp, newp); 540 result = 0; 541 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy) 542 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE); 543 result += newp->tm_yday - oldp->tm_yday; 544 result *= HOURSPERDAY; 545 result += newp->tm_hour - oldp->tm_hour; 546 result *= MINSPERHOUR; 547 result += newp->tm_min - oldp->tm_min; 548 result *= SECSPERMIN; 549 result += newp->tm_sec - oldp->tm_sec; 550 return result; 551 } 552 553 static void 554 show(char *zone, time_t t, int v) 555 { 556 register struct tm * tmp; 557 558 (void) printf("%-*s ", (int) longest, zone); 559 if (v) { 560 tmp = gmtime(&t); 561 if (tmp == NULL) { 562 (void) printf(tformat(), t); 563 } else { 564 dumptime(tmp); 565 (void) printf(" UTC"); 566 } 567 (void) printf(" = "); 568 } 569 tmp = my_localtime(&t); 570 dumptime(tmp); 571 if (tmp != NULL) { 572 if (*abbr(tmp) != '\0') 573 (void) printf(" %s", abbr(tmp)); 574 if (v) { 575 (void) printf(" isdst=%d", tmp->tm_isdst); 576 #ifdef TM_GMTOFF 577 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF); 578 #endif /* defined TM_GMTOFF */ 579 } 580 } 581 (void) printf("\n"); 582 if (tmp != NULL && *abbr(tmp) != '\0') 583 abbrok(abbr(tmp), zone); 584 } 585 586 static char * 587 abbr(tmp) 588 struct tm * tmp; 589 { 590 register char * result; 591 static char nada; 592 593 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1) 594 return &nada; 595 result = tzname[tmp->tm_isdst]; 596 return (result == NULL) ? &nada : result; 597 } 598 599 /* 600 ** The code below can fail on certain theoretical systems; 601 ** it works on all known real-world systems as of 2004-12-30. 602 */ 603 604 static const char * 605 tformat(void) 606 { 607 if (0.5 == (time_t) 0.5) { /* floating */ 608 if (sizeof (time_t) > sizeof (double)) 609 return "%Lg"; 610 return "%g"; 611 } 612 if (0 > (time_t) -1) { /* signed */ 613 if (sizeof (time_t) > sizeof (long)) 614 return "%lld"; 615 if (sizeof (time_t) > sizeof (int)) 616 return "%ld"; 617 return "%d"; 618 } 619 if (sizeof (time_t) > sizeof (unsigned long)) 620 return "%llu"; 621 if (sizeof (time_t) > sizeof (unsigned int)) 622 return "%lu"; 623 return "%u"; 624 } 625 626 static void 627 dumptime(timeptr) 628 register const struct tm * timeptr; 629 { 630 static const char wday_name[][3] = { 631 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 632 }; 633 static const char mon_name[][3] = { 634 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 635 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 636 }; 637 register const char * wn; 638 register const char * mn; 639 register int lead; 640 register int trail; 641 642 if (timeptr == NULL) { 643 (void) printf("NULL"); 644 return; 645 } 646 /* 647 ** The packaged versions of localtime and gmtime never put out-of-range 648 ** values in tm_wday or tm_mon, but since this code might be compiled 649 ** with other (perhaps experimental) versions, paranoia is in order. 650 */ 651 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= 652 (int) (sizeof wday_name / sizeof wday_name[0])) 653 wn = "???"; 654 else wn = wday_name[timeptr->tm_wday]; 655 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= 656 (int) (sizeof mon_name / sizeof mon_name[0])) 657 mn = "???"; 658 else mn = mon_name[timeptr->tm_mon]; 659 (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ", 660 wn, mn, 661 timeptr->tm_mday, timeptr->tm_hour, 662 timeptr->tm_min, timeptr->tm_sec); 663 #define DIVISOR 10 664 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR; 665 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR + 666 trail / DIVISOR; 667 trail %= DIVISOR; 668 if (trail < 0 && lead > 0) { 669 trail += DIVISOR; 670 --lead; 671 } else if (lead < 0 && trail > 0) { 672 trail -= DIVISOR; 673 ++lead; 674 } 675 if (lead == 0) 676 (void) printf("%d", trail); 677 else (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail)); 678 } 679
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