zdump.c revision 1.25.2.2
1 /* $NetBSD: zdump.c,v 1.25.2.2 2013/02/25 00:27:55 tls 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 1.25.2.2 2013/02/25 00:27:55 tls Exp $"); 10 #endif /* !defined lint */ 11 12 #include "version.h" 13 /* 14 ** This code has been made independent of the rest of the time 15 ** conversion package to increase confidence in the verification it provides. 16 ** You can use this code to help in verifying other implementations. 17 */ 18 19 #include "stdio.h" /* for stdout, stderr */ 20 #include "string.h" /* for strcpy */ 21 #include "sys/types.h" /* for time_t */ 22 #include "time.h" /* for struct tm */ 23 #include "stdlib.h" /* for exit, malloc, atoi */ 24 #include <err.h> 25 #include "float.h" /* for FLT_MAX and DBL_MAX */ 26 #include "ctype.h" /* for isalpha et al. */ 27 #ifndef isascii 28 #define isascii(x) 1 29 #endif /* !defined isascii */ 30 31 #include "private.h" 32 33 #ifndef ZDUMP_LO_YEAR 34 #define ZDUMP_LO_YEAR (-500) 35 #endif /* !defined ZDUMP_LO_YEAR */ 36 37 #ifndef ZDUMP_HI_YEAR 38 #define ZDUMP_HI_YEAR 2500 39 #endif /* !defined ZDUMP_HI_YEAR */ 40 41 #ifndef MAX_STRING_LENGTH 42 #define MAX_STRING_LENGTH 1024 43 #endif /* !defined MAX_STRING_LENGTH */ 44 45 #ifndef TRUE 46 #define TRUE 1 47 #endif /* !defined TRUE */ 48 49 #ifndef FALSE 50 #define FALSE 0 51 #endif /* !defined FALSE */ 52 53 #ifndef EXIT_SUCCESS 54 #define EXIT_SUCCESS 0 55 #endif /* !defined EXIT_SUCCESS */ 56 57 #ifndef EXIT_FAILURE 58 #define EXIT_FAILURE 1 59 #endif /* !defined EXIT_FAILURE */ 60 61 #ifndef SECSPERMIN 62 #define SECSPERMIN 60 63 #endif /* !defined SECSPERMIN */ 64 65 #ifndef MINSPERHOUR 66 #define MINSPERHOUR 60 67 #endif /* !defined MINSPERHOUR */ 68 69 #ifndef SECSPERHOUR 70 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 71 #endif /* !defined SECSPERHOUR */ 72 73 #ifndef HOURSPERDAY 74 #define HOURSPERDAY 24 75 #endif /* !defined HOURSPERDAY */ 76 77 #ifndef EPOCH_YEAR 78 #define EPOCH_YEAR 1970 79 #endif /* !defined EPOCH_YEAR */ 80 81 #ifndef TM_YEAR_BASE 82 #define TM_YEAR_BASE 1900 83 #endif /* !defined TM_YEAR_BASE */ 84 85 #ifndef DAYSPERNYEAR 86 #define DAYSPERNYEAR 365 87 #endif /* !defined DAYSPERNYEAR */ 88 89 #ifndef isleap 90 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 91 #endif /* !defined isleap */ 92 93 #ifndef isleap_sum 94 /* 95 ** See tzfile.h for details on isleap_sum. 96 */ 97 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 98 #endif /* !defined isleap_sum */ 99 100 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY) 101 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR) 102 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY) 103 104 #ifndef HAVE_GETTEXT 105 #define HAVE_GETTEXT 0 106 #endif 107 #if HAVE_GETTEXT 108 #include "locale.h" /* for setlocale */ 109 #include "libintl.h" 110 #endif /* HAVE_GETTEXT */ 111 112 #ifndef GNUC_or_lint 113 #ifdef lint 114 #define GNUC_or_lint 115 #else /* !defined lint */ 116 #ifdef __GNUC__ 117 #define GNUC_or_lint 118 #endif /* defined __GNUC__ */ 119 #endif /* !defined lint */ 120 #endif /* !defined GNUC_or_lint */ 121 122 #ifndef __pure 123 #if 2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__) 124 # define __pure __attribute__ ((__pure__)) 125 #else 126 # define __pure /* empty */ 127 #endif 128 #endif 129 130 #ifndef INITIALIZE 131 #ifdef GNUC_or_lint 132 #define INITIALIZE(x) ((x) = 0) 133 #else /* !defined GNUC_or_lint */ 134 #define INITIALIZE(x) 135 #endif /* !defined GNUC_or_lint */ 136 #endif /* !defined INITIALIZE */ 137 138 /* 139 ** For the benefit of GNU folk... 140 ** `_(MSGID)' uses the current locale's message library string for MSGID. 141 ** The default is to use gettext if available, and use MSGID otherwise. 142 */ 143 144 #ifndef _ 145 #if HAVE_GETTEXT 146 #define _(msgid) gettext(msgid) 147 #else /* !HAVE_GETTEXT */ 148 #define _(msgid) msgid 149 #endif /* !HAVE_GETTEXT */ 150 #endif /* !defined _ */ 151 152 #ifndef TZ_DOMAIN 153 #define TZ_DOMAIN "tz" 154 #endif /* !defined TZ_DOMAIN */ 155 156 extern char ** environ; 157 extern int getopt(int argc, char * const argv[], 158 const char * options); 159 extern char * optarg; 160 extern int optind; 161 162 static time_t absolute_min_time; 163 static time_t absolute_max_time; 164 static size_t longest; 165 static char * progname; 166 static int warned; 167 168 static const char * abbr(struct tm * tmp); 169 static void abbrok(const char * abbrp, const char * zone); 170 static long delta(struct tm * newp, struct tm * oldp) __pure; 171 static void dumptime(const struct tm * tmp); 172 static time_t hunt(char * name, time_t lot, time_t hit); 173 int main(int, char **); 174 static void setabsolutes(void); 175 static void show(char * zone, time_t t, int v); 176 static const char * tformat(void); 177 static time_t yeartot(long y) __pure; 178 179 #ifndef TYPECHECK 180 #define my_localtime localtime 181 #else /* !defined TYPECHECK */ 182 static struct tm * 183 my_localtime(time_t *tp) 184 { 185 struct tm *tmp; 186 187 tmp = localtime(tp); 188 if (tp != NULL && tmp != NULL) { 189 struct tm tm; 190 time_t t; 191 192 tm = *tmp; 193 t = mktime(&tm); 194 if (t - *tp >= 1 || *tp - t >= 1) { 195 (void) fflush(stdout); 196 (void) fprintf(stderr, "\n%s: ", progname); 197 (void) fprintf(stderr, tformat(), *tp); 198 (void) fprintf(stderr, " ->"); 199 (void) fprintf(stderr, " year=%d", tmp->tm_year); 200 (void) fprintf(stderr, " mon=%d", tmp->tm_mon); 201 (void) fprintf(stderr, " mday=%d", tmp->tm_mday); 202 (void) fprintf(stderr, " hour=%d", tmp->tm_hour); 203 (void) fprintf(stderr, " min=%d", tmp->tm_min); 204 (void) fprintf(stderr, " sec=%d", tmp->tm_sec); 205 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst); 206 (void) fprintf(stderr, " -> "); 207 (void) fprintf(stderr, tformat(), t); 208 (void) fprintf(stderr, "\n"); 209 } 210 } 211 return tmp; 212 } 213 #endif /* !defined TYPECHECK */ 214 215 static void 216 abbrok(const char *const abbrp, const char *const zone) 217 { 218 const char *cp; 219 const char *wp; 220 221 if (warned) 222 return; 223 cp = abbrp; 224 wp = NULL; 225 while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp)) 226 ++cp; 227 if (cp - abbrp == 0) 228 wp = _("lacks alphabetic at start"); 229 else if (cp - abbrp < 3) 230 wp = _("has fewer than 3 alphabetics"); 231 else if (cp - abbrp > 6) 232 wp = _("has more than 6 alphabetics"); 233 if (wp == NULL && (*cp == '+' || *cp == '-')) { 234 ++cp; 235 if (isascii((unsigned char) *cp) && 236 isdigit((unsigned char) *cp)) 237 if (*cp++ == '1' && *cp >= '0' && *cp <= '4') 238 ++cp; 239 if (*cp != '\0') 240 wp = _("differs from POSIX standard"); 241 } 242 if (wp == NULL) 243 return; 244 (void) fflush(stdout); 245 (void) fprintf(stderr, 246 _("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"), 247 progname, zone, abbrp, wp); 248 warned = TRUE; 249 } 250 251 __dead static void 252 usage(FILE *const stream, const int status) 253 { 254 (void) fprintf(stream, 255 _("%s: usage is %s [ --version ] [ --help ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n\ 256 \n\ 257 Report bugs to tz (at) elsie.nci.nih.gov.\n"), 258 progname, progname); 259 exit(status); 260 } 261 262 int 263 main(int argc, char *argv[]) 264 { 265 int i; 266 int c; 267 int vflag; 268 char * cutarg; 269 long cutloyear = ZDUMP_LO_YEAR; 270 long cuthiyear = ZDUMP_HI_YEAR; 271 time_t cutlotime; 272 time_t cuthitime; 273 char ** fakeenv; 274 time_t now; 275 time_t t; 276 time_t newt; 277 struct tm tm; 278 struct tm newtm; 279 struct tm * tmp; 280 struct tm * newtmp; 281 282 INITIALIZE(cutlotime); 283 INITIALIZE(cuthitime); 284 #if HAVE_GETTEXT 285 (void) setlocale(LC_ALL, ""); 286 #ifdef TZ_DOMAINDIR 287 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR); 288 #endif /* defined TEXTDOMAINDIR */ 289 (void) textdomain(TZ_DOMAIN); 290 #endif /* HAVE_GETTEXT */ 291 progname = argv[0]; 292 for (i = 1; i < argc; ++i) 293 if (strcmp(argv[i], "--version") == 0) { 294 (void) printf("%s\n", TZVERSION); 295 exit(EXIT_SUCCESS); 296 } else if (strcmp(argv[i], "--help") == 0) { 297 usage(stdout, EXIT_SUCCESS); 298 } 299 vflag = 0; 300 cutarg = NULL; 301 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v') 302 if (c == 'v') 303 vflag = 1; 304 else cutarg = optarg; 305 if ((c != EOF && c != -1) || 306 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) { 307 usage(stderr, EXIT_FAILURE); 308 } 309 if (vflag) { 310 if (cutarg != NULL) { 311 long lo; 312 long hi; 313 char dummy; 314 315 if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) { 316 cuthiyear = hi; 317 } else if (sscanf(cutarg, "%ld,%ld%c", 318 &lo, &hi, &dummy) == 2) { 319 cutloyear = lo; 320 cuthiyear = hi; 321 } else { 322 (void) fprintf(stderr, _("%s: wild -c argument %s\n"), 323 progname, cutarg); 324 exit(EXIT_FAILURE); 325 } 326 } 327 setabsolutes(); 328 cutlotime = yeartot(cutloyear); 329 cuthitime = yeartot(cuthiyear); 330 } 331 (void) time(&now); 332 longest = 0; 333 for (i = optind; i < argc; ++i) 334 if (strlen(argv[i]) > longest) 335 longest = strlen(argv[i]); 336 { 337 int from; 338 int to; 339 340 for (i = 0; environ[i] != NULL; ++i) 341 continue; 342 fakeenv = malloc((i + 2) * sizeof *fakeenv); 343 if (fakeenv == NULL || 344 (fakeenv[0] = malloc(longest + 4)) == NULL) { 345 err(EXIT_FAILURE, "Can't allocated %zu bytes", 346 longest + 4); 347 } 348 to = 0; 349 (void)strcpy(fakeenv[to++], "TZ="); /* XXX strcpy is safe */ 350 for (from = 0; environ[from] != NULL; ++from) 351 if (strncmp(environ[from], "TZ=", 3) != 0) 352 fakeenv[to++] = environ[from]; 353 fakeenv[to] = NULL; 354 environ = fakeenv; 355 } 356 for (i = optind; i < argc; ++i) { 357 static char buf[MAX_STRING_LENGTH]; 358 359 (void) strcpy(&fakeenv[0][3], argv[i]); /* XXX strcpy is safe */ 360 if (!vflag) { 361 show(argv[i], now, FALSE); 362 continue; 363 } 364 warned = FALSE; 365 t = absolute_min_time; 366 show(argv[i], t, TRUE); 367 t += SECSPERHOUR * HOURSPERDAY; 368 show(argv[i], t, TRUE); 369 if (t < cutlotime) 370 t = cutlotime; 371 tmp = my_localtime(&t); 372 if (tmp != NULL) { 373 tm = *tmp; 374 (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); 375 } 376 for ( ; ; ) { 377 if (t >= cuthitime || t >= cuthitime - SECSPERHOUR * 12) 378 break; 379 newt = t + SECSPERHOUR * 12; 380 newtmp = localtime(&newt); 381 if (newtmp != NULL) 382 newtm = *newtmp; 383 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) : 384 (delta(&newtm, &tm) != (newt - t) || 385 newtm.tm_isdst != tm.tm_isdst || 386 strcmp(abbr(&newtm), buf) != 0)) { 387 newt = hunt(argv[i], t, newt); 388 newtmp = localtime(&newt); 389 if (newtmp != NULL) { 390 newtm = *newtmp; 391 (void) strncpy(buf, 392 abbr(&newtm), 393 (sizeof buf) - 1); 394 } 395 } 396 t = newt; 397 tm = newtm; 398 tmp = newtmp; 399 } 400 t = absolute_max_time; 401 t -= SECSPERHOUR * HOURSPERDAY; 402 show(argv[i], t, TRUE); 403 t += SECSPERHOUR * HOURSPERDAY; 404 show(argv[i], t, TRUE); 405 } 406 if (fflush(stdout) || ferror(stdout)) { 407 err(EXIT_FAILURE, _("Error writing standard output")); 408 } 409 exit(EXIT_SUCCESS); 410 /* If exit fails to exit... */ 411 return EXIT_FAILURE; 412 } 413 414 static time_t 415 ovfl_check(time_t t) 416 { 417 if (t < 0 && t - 1 >= 0) 418 return t; 419 else 420 return t - 1; 421 } 422 423 static void 424 setabsolutes(void) 425 { 426 if (0.5 == (time_t) 0.5) { 427 /* 428 ** time_t is floating. 429 */ 430 if (sizeof (time_t) == sizeof (float)) { 431 absolute_min_time = (time_t) -FLT_MAX; 432 absolute_max_time = (time_t) FLT_MAX; 433 } else if (sizeof (time_t) == sizeof (double)) { 434 absolute_min_time = (time_t) -DBL_MAX; 435 absolute_max_time = (time_t) DBL_MAX; 436 } else { 437 (void) fprintf(stderr, 438 _("%s: use of -v on system with floating time_t other than float or double\n"), 439 progname); 440 exit(EXIT_FAILURE); 441 } 442 } else if (0 > (time_t) -1) { 443 /* 444 ** time_t is signed. Assume overflow wraps around. 445 */ 446 time_t t = 0; 447 time_t t1 = 1; 448 449 while (t < t1) { 450 t = t1; 451 t1 = 2 * t1 + 1; 452 } 453 454 absolute_max_time = t; 455 t = -t; 456 absolute_min_time = ovfl_check(t); 457 } else { 458 /* 459 ** time_t is unsigned. 460 */ 461 absolute_min_time = 0; 462 absolute_max_time = absolute_min_time - 1; 463 } 464 } 465 466 static time_t 467 yeartot(const long y) 468 { 469 long myy; 470 long seconds; 471 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 } 496 497 static time_t 498 hunt(char *name, time_t lot, time_t hit) 499 { 500 time_t t; 501 long diff; 502 struct tm lotm; 503 struct tm * lotmp; 504 struct tm tm; 505 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 */ 543 544 static long 545 delta(struct tm *newp, struct tm *oldp) 546 { 547 long result; 548 int tmy; 549 550 if (newp->tm_year < oldp->tm_year) 551 return -delta(oldp, newp); 552 result = 0; 553 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy) 554 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE); 555 result += newp->tm_yday - oldp->tm_yday; 556 result *= HOURSPERDAY; 557 result += newp->tm_hour - oldp->tm_hour; 558 result *= MINSPERHOUR; 559 result += newp->tm_min - oldp->tm_min; 560 result *= SECSPERMIN; 561 result += newp->tm_sec - oldp->tm_sec; 562 return result; 563 } 564 565 static void 566 show(char *zone, time_t t, int v) 567 { 568 struct tm * tmp; 569 570 (void) printf("%-*s ", (int) longest, zone); 571 if (v) { 572 tmp = gmtime(&t); 573 if (tmp == NULL) { 574 (void) printf(tformat(), t); 575 } else { 576 dumptime(tmp); 577 (void) printf(" UTC"); 578 } 579 (void) printf(" = "); 580 } 581 tmp = my_localtime(&t); 582 dumptime(tmp); 583 if (tmp != NULL) { 584 if (*abbr(tmp) != '\0') 585 (void) printf(" %s", abbr(tmp)); 586 if (v) { 587 (void) printf(" isdst=%d", tmp->tm_isdst); 588 #ifdef TM_GMTOFF 589 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF); 590 #endif /* defined TM_GMTOFF */ 591 } 592 } 593 (void) printf("\n"); 594 if (tmp != NULL && *abbr(tmp) != '\0') 595 abbrok(abbr(tmp), zone); 596 } 597 598 static const char * 599 abbr(struct tm *tmp) 600 { 601 const char * result; 602 static const char nada; 603 604 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1) 605 return &nada; 606 result = tzname[tmp->tm_isdst]; 607 return (result == NULL) ? &nada : result; 608 } 609 610 /* 611 ** The code below can fail on certain theoretical systems; 612 ** it works on all known real-world systems as of 2004-12-30. 613 */ 614 615 static const char * 616 tformat(void) 617 { 618 if (0.5 == (time_t) 0.5) { /* floating */ 619 if (sizeof (time_t) > sizeof (double)) 620 return "%Lg"; 621 return "%g"; 622 } 623 if (0 > (time_t) -1) { /* signed */ 624 if (sizeof (time_t) > sizeof (long)) 625 return "%lld"; 626 if (sizeof (time_t) > sizeof (int)) 627 return "%ld"; 628 return "%d"; 629 } 630 if (sizeof (time_t) > sizeof (unsigned long)) 631 return "%llu"; 632 if (sizeof (time_t) > sizeof (unsigned int)) 633 return "%lu"; 634 return "%u"; 635 } 636 637 static void 638 dumptime(const struct tm *timeptr) 639 { 640 static const char wday_name[][3] = { 641 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 642 }; 643 static const char mon_name[][3] = { 644 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 645 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 646 }; 647 const char * wn; 648 const char * mn; 649 int lead; 650 int trail; 651 652 if (timeptr == NULL) { 653 (void) printf("NULL"); 654 return; 655 } 656 /* 657 ** The packaged versions of localtime and gmtime never put out-of-range 658 ** values in tm_wday or tm_mon, but since this code might be compiled 659 ** with other (perhaps experimental) versions, paranoia is in order. 660 */ 661 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= 662 (int) (sizeof wday_name / sizeof wday_name[0])) 663 wn = "???"; 664 else wn = wday_name[timeptr->tm_wday]; 665 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= 666 (int) (sizeof mon_name / sizeof mon_name[0])) 667 mn = "???"; 668 else mn = mon_name[timeptr->tm_mon]; 669 (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ", 670 wn, mn, 671 timeptr->tm_mday, timeptr->tm_hour, 672 timeptr->tm_min, timeptr->tm_sec); 673 #define DIVISOR 10 674 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR; 675 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR + 676 trail / DIVISOR; 677 trail %= DIVISOR; 678 if (trail < 0 && lead > 0) { 679 trail += DIVISOR; 680 --lead; 681 } else if (lead < 0 && trail > 0) { 682 trail -= DIVISOR; 683 ++lead; 684 } 685 if (lead == 0) 686 (void) printf("%d", trail); 687 else (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail)); 688 } 689
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