zdump.c revision 1.24.2.2
1 /* $NetBSD: zdump.c,v 1.24.2.2 2014/05/22 11:36:54 yamt 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 1.24.2.2 2014/05/22 11:36:54 yamt 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 ** However, include private.h when debugging, so that it overrides 19 ** time_t consistently with the rest of the package. 20 */ 21 22 #include "private.h" 23 24 #include "stdio.h" /* for stdout, stderr */ 25 #include "string.h" /* for strcpy */ 26 #include "sys/types.h" /* for time_t */ 27 #include "time.h" /* for struct tm */ 28 #include "stdlib.h" /* for exit, malloc, atoi */ 29 #include <err.h> 30 #include "ctype.h" /* for isalpha et al. */ 31 #ifndef isascii 32 #define isascii(x) 1 33 #endif /* !defined isascii */ 34 35 /* 36 ** Substitutes for pre-C99 compilers. 37 ** Much of this section of code is stolen from private.h. 38 */ 39 40 #ifndef HAVE_STDINT_H 41 # define HAVE_STDINT_H \ 42 (199901 <= __STDC_VERSION__ || 2 < (__GLIBC__ + (0 < __GLIBC_MINOR__))) 43 #endif 44 #if HAVE_STDINT_H 45 # include "stdint.h" 46 #endif 47 #ifndef HAVE_INTTYPES_H 48 # define HAVE_INTTYPES_H HAVE_STDINT_H 49 #endif 50 #if HAVE_INTTYPES_H 51 # include <inttypes.h> 52 #endif 53 54 #ifndef INT_FAST32_MAX 55 # if INT_MAX >> 31 == 0 56 typedef long int_fast32_t; 57 # else 58 typedef int int_fast32_t; 59 # endif 60 #endif 61 62 #ifndef INTMAX_MAX 63 # if defined LLONG_MAX || defined __LONG_LONG_MAX__ 64 typedef long long intmax_t; 65 # define strtoimax strtoll 66 # define PRIdMAX "lld" 67 # ifdef LLONG_MAX 68 # define INTMAX_MAX LLONG_MAX 69 # else 70 # define INTMAX_MAX __LONG_LONG_MAX__ 71 # endif 72 # else 73 typedef long intmax_t; 74 # define strtoimax strtol 75 # define PRIdMAX "ld" 76 # define INTMAX_MAX LONG_MAX 77 # endif 78 #endif 79 80 81 #ifndef ZDUMP_LO_YEAR 82 #define ZDUMP_LO_YEAR (-500) 83 #endif /* !defined ZDUMP_LO_YEAR */ 84 85 #ifndef ZDUMP_HI_YEAR 86 #define ZDUMP_HI_YEAR 2500 87 #endif /* !defined ZDUMP_HI_YEAR */ 88 89 #ifndef MAX_STRING_LENGTH 90 #define MAX_STRING_LENGTH 1024 91 #endif /* !defined MAX_STRING_LENGTH */ 92 93 #ifndef TRUE 94 #define TRUE 1 95 #endif /* !defined TRUE */ 96 97 #ifndef FALSE 98 #define FALSE 0 99 #endif /* !defined FALSE */ 100 101 #ifndef EXIT_SUCCESS 102 #define EXIT_SUCCESS 0 103 #endif /* !defined EXIT_SUCCESS */ 104 105 #ifndef EXIT_FAILURE 106 #define EXIT_FAILURE 1 107 #endif /* !defined EXIT_FAILURE */ 108 109 #ifndef SECSPERMIN 110 #define SECSPERMIN 60 111 #endif /* !defined SECSPERMIN */ 112 113 #ifndef MINSPERHOUR 114 #define MINSPERHOUR 60 115 #endif /* !defined MINSPERHOUR */ 116 117 #ifndef SECSPERHOUR 118 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 119 #endif /* !defined SECSPERHOUR */ 120 121 #ifndef HOURSPERDAY 122 #define HOURSPERDAY 24 123 #endif /* !defined HOURSPERDAY */ 124 125 #ifndef EPOCH_YEAR 126 #define EPOCH_YEAR 1970 127 #endif /* !defined EPOCH_YEAR */ 128 129 #ifndef TM_YEAR_BASE 130 #define TM_YEAR_BASE 1900 131 #endif /* !defined TM_YEAR_BASE */ 132 133 #ifndef DAYSPERNYEAR 134 #define DAYSPERNYEAR 365 135 #endif /* !defined DAYSPERNYEAR */ 136 137 #ifndef isleap 138 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 139 #endif /* !defined isleap */ 140 141 #ifndef isleap_sum 142 /* 143 ** See tzfile.h for details on isleap_sum. 144 */ 145 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 146 #endif /* !defined isleap_sum */ 147 148 #define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY) 149 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR) 150 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY) 151 #define SECSPER400YEARS (SECSPERNYEAR * (intmax_t) (300 + 3) \ 152 + SECSPERLYEAR * (intmax_t) (100 - 3)) 153 154 /* 155 ** True if SECSPER400YEARS is known to be representable as an 156 ** intmax_t. It's OK that SECSPER400YEARS_FITS can in theory be false 157 ** even if SECSPER400YEARS is representable, because when that happens 158 ** the code merely runs a bit more slowly, and this slowness doesn't 159 ** occur on any practical platform. 160 */ 161 enum { SECSPER400YEARS_FITS = SECSPERLYEAR <= INTMAX_MAX / 400 }; 162 163 #ifndef HAVE_GETTEXT 164 #define HAVE_GETTEXT 0 165 #endif 166 #if HAVE_GETTEXT 167 #include "locale.h" /* for setlocale */ 168 #include "libintl.h" 169 #endif /* HAVE_GETTEXT */ 170 171 #ifndef GNUC_or_lint 172 #ifdef lint 173 #define GNUC_or_lint 174 #else /* !defined lint */ 175 #ifdef __GNUC__ 176 #define GNUC_or_lint 177 #endif /* defined __GNUC__ */ 178 #endif /* !defined lint */ 179 #endif /* !defined GNUC_or_lint */ 180 181 #ifndef ATTRIBUTE_PURE 182 #if 2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__) 183 # define ATTRIBUTE_PURE __attribute__ ((ATTRIBUTE_PURE__)) 184 #else 185 # define ATTRIBUTE_PURE /* empty */ 186 #endif 187 #endif 188 189 #ifndef INITIALIZE 190 #ifdef GNUC_or_lint 191 #define INITIALIZE(x) ((x) = 0) 192 #else /* !defined GNUC_or_lint */ 193 #define INITIALIZE(x) 194 #endif /* !defined GNUC_or_lint */ 195 #endif /* !defined INITIALIZE */ 196 197 /* 198 ** For the benefit of GNU folk... 199 ** `_(MSGID)' uses the current locale's message library string for MSGID. 200 ** The default is to use gettext if available, and use MSGID otherwise. 201 */ 202 203 #ifndef _ 204 #if HAVE_GETTEXT 205 #define _(msgid) gettext(msgid) 206 #else /* !HAVE_GETTEXT */ 207 #define _(msgid) msgid 208 #endif /* !HAVE_GETTEXT */ 209 #endif /* !defined _ */ 210 211 #ifndef TZ_DOMAIN 212 #define TZ_DOMAIN "tz" 213 #endif /* !defined TZ_DOMAIN */ 214 215 extern char ** environ; 216 extern int getopt(int argc, char * const argv[], 217 const char * options); 218 extern char * optarg; 219 extern int optind; 220 221 /* The minimum and maximum finite time values. */ 222 static time_t absolute_min_time = 223 ((time_t) -1 < 0 224 ? (time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1) 225 : 0); 226 static time_t absolute_max_time = 227 ((time_t) -1 < 0 228 ? - (~ 0 < 0) - ((time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1)) 229 : -1); 230 static size_t longest; 231 static char * progname; 232 static int warned; 233 234 static const char * abbr(struct tm * tmp); 235 static void abbrok(const char * abbrp, const char * zone); 236 static intmax_t delta(struct tm * newp, struct tm * oldp) ATTRIBUTE_PURE; 237 static void dumptime(const struct tm * tmp); 238 static time_t hunt(char * name, time_t lot, time_t hit); 239 static void show(char * zone, time_t t, int v); 240 static const char * tformat(void); 241 static time_t yeartot(long y) ATTRIBUTE_PURE; 242 243 #ifndef TYPECHECK 244 #define my_localtime localtime 245 #else /* !defined TYPECHECK */ 246 static struct tm * 247 my_localtime(time_t *tp) 248 { 249 struct tm *tmp; 250 251 tmp = localtime(tp); 252 if (tp != NULL && tmp != NULL) { 253 struct tm tm; 254 time_t t; 255 256 tm = *tmp; 257 t = mktime(&tm); 258 if (t != *tp) { 259 (void) fflush(stdout); 260 (void) fprintf(stderr, "\n%s: ", progname); 261 (void) fprintf(stderr, tformat(), *tp); 262 (void) fprintf(stderr, " ->"); 263 (void) fprintf(stderr, " year=%d", tmp->tm_year); 264 (void) fprintf(stderr, " mon=%d", tmp->tm_mon); 265 (void) fprintf(stderr, " mday=%d", tmp->tm_mday); 266 (void) fprintf(stderr, " hour=%d", tmp->tm_hour); 267 (void) fprintf(stderr, " min=%d", tmp->tm_min); 268 (void) fprintf(stderr, " sec=%d", tmp->tm_sec); 269 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst); 270 (void) fprintf(stderr, " -> "); 271 (void) fprintf(stderr, tformat(), t); 272 (void) fprintf(stderr, "\n"); 273 } 274 } 275 return tmp; 276 } 277 #endif /* !defined TYPECHECK */ 278 279 static void 280 abbrok(const char *const abbrp, const char *const zone) 281 { 282 const char *cp; 283 const char *wp; 284 285 if (warned) 286 return; 287 cp = abbrp; 288 wp = NULL; 289 while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp)) 290 ++cp; 291 if (cp - abbrp == 0) 292 wp = _("lacks alphabetic at start"); 293 else if (cp - abbrp < 3) 294 wp = _("has fewer than 3 alphabetics"); 295 else if (cp - abbrp > 6) 296 wp = _("has more than 6 alphabetics"); 297 if (wp == NULL && (*cp == '+' || *cp == '-')) { 298 ++cp; 299 if (isascii((unsigned char) *cp) && 300 isdigit((unsigned char) *cp)) 301 if (*cp++ == '1' && *cp >= '0' && *cp <= '4') 302 ++cp; 303 if (*cp != '\0') 304 wp = _("differs from POSIX standard"); 305 } 306 if (wp == NULL) 307 return; 308 (void) fflush(stdout); 309 (void) fprintf(stderr, 310 _("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"), 311 progname, zone, abbrp, wp); 312 warned = TRUE; 313 } 314 315 __dead static void 316 usage(FILE *const stream, const int status) 317 { 318 (void) fprintf(stream, 319 _("%s: usage: %s [--version] [--help] [-{vV}] [-{ct} [lo,]hi] zonename ...\n" 320 "\n" 321 "Report bugs to %s.\n"), 322 progname, progname, REPORT_BUGS_TO); 323 exit(status); 324 } 325 326 int 327 main(int argc, char *argv[]) 328 { 329 int i; 330 int vflag; 331 int Vflag; 332 char * cutarg; 333 char * cuttimes; 334 time_t cutlotime; 335 time_t cuthitime; 336 char ** fakeenv; 337 time_t now; 338 time_t t; 339 time_t newt; 340 struct tm tm; 341 struct tm newtm; 342 struct tm * tmp; 343 struct tm * newtmp; 344 345 cutlotime = absolute_min_time; 346 cuthitime = absolute_max_time; 347 #if HAVE_GETTEXT 348 (void) setlocale(LC_ALL, ""); 349 #ifdef TZ_DOMAINDIR 350 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR); 351 #endif /* defined TEXTDOMAINDIR */ 352 (void) textdomain(TZ_DOMAIN); 353 #endif /* HAVE_GETTEXT */ 354 progname = argv[0]; 355 for (i = 1; i < argc; ++i) 356 if (strcmp(argv[i], "--version") == 0) { 357 (void) printf("zdump %s%s\n", PKGVERSION, TZVERSION); 358 exit(EXIT_SUCCESS); 359 } else if (strcmp(argv[i], "--help") == 0) { 360 usage(stdout, EXIT_SUCCESS); 361 } 362 vflag = Vflag = 0; 363 cutarg = cuttimes = NULL; 364 for (;;) 365 switch (getopt(argc, argv, "c:t:vV")) { 366 case 'c': cutarg = optarg; break; 367 case 't': cuttimes = optarg; break; 368 case 'v': vflag = 1; break; 369 case 'V': Vflag = 1; break; 370 case -1: 371 if (! (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) 372 goto arg_processing_done; 373 /* Fall through. */ 374 default: 375 usage(stderr, EXIT_FAILURE); 376 } 377 arg_processing_done:; 378 379 if (vflag | Vflag) { 380 intmax_t lo; 381 intmax_t hi; 382 char *loend, *hiend; 383 intmax_t cutloyear = ZDUMP_LO_YEAR; 384 intmax_t cuthiyear = ZDUMP_HI_YEAR; 385 if (cutarg != NULL) { 386 lo = strtoimax(cutarg, &loend, 10); 387 if (cutarg != loend && !*loend) { 388 hi = lo; 389 cuthiyear = hi; 390 } else if (cutarg != loend && *loend == ',' 391 && (hi = strtoimax(loend + 1, &hiend, 10), 392 loend + 1 != hiend && !*hiend)) { 393 cutloyear = lo; 394 cuthiyear = hi; 395 } else { 396 (void) fprintf(stderr, _("%s: wild -c argument %s\n"), 397 progname, cutarg); 398 exit(EXIT_FAILURE); 399 } 400 } 401 if (cutarg != NULL || cuttimes == NULL) { 402 cutlotime = yeartot(cutloyear); 403 cuthitime = yeartot(cuthiyear); 404 } 405 if (cuttimes != NULL) { 406 lo = strtoimax(cuttimes, &loend, 10); 407 if (cuttimes != loend && !*loend) { 408 hi = lo; 409 if (hi < cuthitime) { 410 if (hi < absolute_min_time) 411 hi = absolute_min_time; 412 cuthitime = hi; 413 } 414 } else if (cuttimes != loend && *loend == ',' 415 && (hi = strtoimax(loend + 1, &hiend, 10), 416 loend + 1 != hiend && !*hiend)) { 417 if (cutlotime < lo) { 418 if (absolute_max_time < lo) 419 lo = absolute_max_time; 420 cutlotime = lo; 421 } 422 if (hi < cuthitime) { 423 if (hi < absolute_min_time) 424 hi = absolute_min_time; 425 cuthitime = hi; 426 } 427 } else { 428 (void) fprintf(stderr, 429 _("%s: wild -t argument %s\n"), 430 progname, cuttimes); 431 exit(EXIT_FAILURE); 432 } 433 } 434 } 435 (void) time(&now); 436 longest = 0; 437 for (i = optind; i < argc; ++i) 438 if (strlen(argv[i]) > longest) 439 longest = strlen(argv[i]); 440 { 441 int from; 442 int to; 443 444 for (i = 0; environ[i] != NULL; ++i) 445 continue; 446 fakeenv = malloc((i + 2) * sizeof *fakeenv); 447 if (fakeenv == NULL || 448 (fakeenv[0] = malloc(longest + 4)) == NULL) { 449 err(EXIT_FAILURE, "Can't allocated %zu bytes", 450 longest + 4); 451 } 452 to = 0; 453 (void)strcpy(fakeenv[to++], "TZ="); /* XXX strcpy is safe */ 454 for (from = 0; environ[from] != NULL; ++from) 455 if (strncmp(environ[from], "TZ=", 3) != 0) 456 fakeenv[to++] = environ[from]; 457 fakeenv[to] = NULL; 458 environ = fakeenv; 459 } 460 for (i = optind; i < argc; ++i) { 461 static char buf[MAX_STRING_LENGTH]; 462 463 (void) strcpy(&fakeenv[0][3], argv[i]); /* XXX strcpy is safe */ 464 if (! (vflag | Vflag)) { 465 show(argv[i], now, FALSE); 466 continue; 467 } 468 warned = FALSE; 469 t = absolute_min_time; 470 if (!Vflag) { 471 show(argv[i], t, TRUE); 472 t += SECSPERDAY; 473 show(argv[i], t, TRUE); 474 } 475 if (t < cutlotime) 476 t = cutlotime; 477 tmp = my_localtime(&t); 478 if (tmp != NULL) { 479 tm = *tmp; 480 (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); 481 } 482 for ( ; ; ) { 483 newt = (t < absolute_max_time - SECSPERDAY / 2 484 ? t + SECSPERDAY / 2 485 : absolute_max_time); 486 if (cuthitime <= newt) 487 break; 488 newtmp = localtime(&newt); 489 if (newtmp != NULL) 490 newtm = *newtmp; 491 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) : 492 (delta(&newtm, &tm) != (newt - t) || 493 newtm.tm_isdst != tm.tm_isdst || 494 strcmp(abbr(&newtm), buf) != 0)) { 495 newt = hunt(argv[i], t, newt); 496 newtmp = localtime(&newt); 497 if (newtmp != NULL) { 498 newtm = *newtmp; 499 (void) strncpy(buf, 500 abbr(&newtm), 501 (sizeof buf) - 1); 502 } 503 } 504 t = newt; 505 tm = newtm; 506 tmp = newtmp; 507 } 508 if (!Vflag) { 509 t = absolute_max_time; 510 t -= SECSPERDAY; 511 show(argv[i], t, TRUE); 512 t += SECSPERDAY; 513 show(argv[i], t, TRUE); 514 } 515 } 516 if (fflush(stdout) || ferror(stdout)) { 517 err(EXIT_FAILURE, _("Error writing standard output")); 518 } 519 exit(EXIT_SUCCESS); 520 /* If exit fails to exit... */ 521 return EXIT_FAILURE; 522 } 523 524 static time_t 525 yeartot(const long y) 526 { 527 intmax_t myy, seconds, years; 528 time_t t; 529 530 myy = EPOCH_YEAR; 531 t = 0; 532 while (myy < y) { 533 if (SECSPER400YEARS_FITS && 400 <= y - myy) { 534 intmax_t diff400 = (y - myy) / 400; 535 if (INTMAX_MAX / SECSPER400YEARS < diff400) 536 return absolute_max_time; 537 seconds = diff400 * SECSPER400YEARS; 538 years = diff400 * 400; 539 } else { 540 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR; 541 years = 1; 542 } 543 myy += years; 544 if (t > absolute_max_time - seconds) 545 return absolute_max_time; 546 t += seconds; 547 } 548 while (y < myy) { 549 if (SECSPER400YEARS_FITS && y + 400 <= myy && myy < 0) { 550 intmax_t diff400 = (myy - y) / 400; 551 if (INTMAX_MAX / SECSPER400YEARS < diff400) 552 return absolute_min_time; 553 seconds = diff400 * SECSPER400YEARS; 554 years = diff400 * 400; 555 } else { 556 seconds = isleap(myy - 1) ? SECSPERLYEAR : SECSPERNYEAR; 557 years = 1; 558 } 559 myy -= years; 560 if (t < absolute_min_time + seconds) 561 return absolute_min_time; 562 t -= seconds; 563 } 564 return t; 565 } 566 567 static time_t 568 hunt(char *name, time_t lot, time_t hit) 569 { 570 time_t t; 571 struct tm lotm; 572 struct tm * lotmp; 573 struct tm tm; 574 struct tm * tmp; 575 char loab[MAX_STRING_LENGTH]; 576 577 lotmp = my_localtime(&lot); 578 if (lotmp != NULL) { 579 lotm = *lotmp; 580 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); 581 } 582 for ( ; ; ) { 583 time_t diff = hit - lot; 584 if (diff < 2) 585 break; 586 t = lot; 587 t += diff / 2; 588 if (t <= lot) 589 ++t; 590 else if (t >= hit) 591 --t; 592 tmp = my_localtime(&t); 593 if (tmp != NULL) 594 tm = *tmp; 595 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) : 596 (delta(&tm, &lotm) == (t - lot) && 597 tm.tm_isdst == lotm.tm_isdst && 598 strcmp(abbr(&tm), loab) == 0)) { 599 lot = t; 600 lotm = tm; 601 lotmp = tmp; 602 } else hit = t; 603 } 604 show(name, lot, TRUE); 605 show(name, hit, TRUE); 606 return hit; 607 } 608 609 /* 610 ** Thanks to Paul Eggert for logic used in delta. 611 */ 612 613 static intmax_t 614 delta(struct tm *newp, struct tm *oldp) 615 { 616 intmax_t result; 617 int tmy; 618 619 if (newp->tm_year < oldp->tm_year) 620 return -delta(oldp, newp); 621 result = 0; 622 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy) 623 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE); 624 result += newp->tm_yday - oldp->tm_yday; 625 result *= HOURSPERDAY; 626 result += newp->tm_hour - oldp->tm_hour; 627 result *= MINSPERHOUR; 628 result += newp->tm_min - oldp->tm_min; 629 result *= SECSPERMIN; 630 result += newp->tm_sec - oldp->tm_sec; 631 return result; 632 } 633 634 static void 635 show(char *zone, time_t t, int v) 636 { 637 struct tm * tmp; 638 639 (void) printf("%-*s ", (int) longest, zone); 640 if (v) { 641 tmp = gmtime(&t); 642 if (tmp == NULL) { 643 (void) printf(tformat(), t); 644 } else { 645 dumptime(tmp); 646 (void) printf(" UT"); 647 } 648 (void) printf(" = "); 649 } 650 tmp = my_localtime(&t); 651 dumptime(tmp); 652 if (tmp != NULL) { 653 if (*abbr(tmp) != '\0') 654 (void) printf(" %s", abbr(tmp)); 655 if (v) { 656 (void) printf(" isdst=%d", tmp->tm_isdst); 657 #ifdef TM_GMTOFF 658 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF); 659 #endif /* defined TM_GMTOFF */ 660 } 661 } 662 (void) printf("\n"); 663 if (tmp != NULL && *abbr(tmp) != '\0') 664 abbrok(abbr(tmp), zone); 665 } 666 667 static const char * 668 abbr(struct tm *tmp) 669 { 670 const char * result; 671 static const char nada; 672 673 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1) 674 return &nada; 675 result = tzname[tmp->tm_isdst]; 676 return (result == NULL) ? &nada : result; 677 } 678 679 /* 680 ** The code below can fail on certain theoretical systems; 681 ** it works on all known real-world systems as of 2004-12-30. 682 */ 683 684 static const char * 685 tformat(void) 686 { 687 if (0 > (time_t) -1) { /* signed */ 688 if (sizeof (time_t) == sizeof (intmax_t)) 689 return "%"PRIdMAX; 690 if (sizeof (time_t) > sizeof (long)) 691 return "%lld"; 692 if (sizeof (time_t) > sizeof (int)) 693 return "%ld"; 694 return "%d"; 695 } 696 #ifdef PRIuMAX 697 if (sizeof (time_t) == sizeof (uintmax_t)) 698 return "%"PRIuMAX; 699 #endif 700 if (sizeof (time_t) > sizeof (unsigned long)) 701 return "%llu"; 702 if (sizeof (time_t) > sizeof (unsigned int)) 703 return "%lu"; 704 return "%u"; 705 } 706 707 static void 708 dumptime(const struct tm *timeptr) 709 { 710 static const char wday_name[][3] = { 711 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 712 }; 713 static const char mon_name[][3] = { 714 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 715 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 716 }; 717 const char * wn; 718 const char * mn; 719 int lead; 720 int trail; 721 722 if (timeptr == NULL) { 723 (void) printf("NULL"); 724 return; 725 } 726 /* 727 ** The packaged versions of localtime and gmtime never put out-of-range 728 ** values in tm_wday or tm_mon, but since this code might be compiled 729 ** with other (perhaps experimental) versions, paranoia is in order. 730 */ 731 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= 732 (int) (sizeof wday_name / sizeof wday_name[0])) 733 wn = "???"; 734 else wn = wday_name[timeptr->tm_wday]; 735 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= 736 (int) (sizeof mon_name / sizeof mon_name[0])) 737 mn = "???"; 738 else mn = mon_name[timeptr->tm_mon]; 739 (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ", 740 wn, mn, 741 timeptr->tm_mday, timeptr->tm_hour, 742 timeptr->tm_min, timeptr->tm_sec); 743 #define DIVISOR 10 744 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR; 745 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR + 746 trail / DIVISOR; 747 trail %= DIVISOR; 748 if (trail < 0 && lead > 0) { 749 trail += DIVISOR; 750 --lead; 751 } else if (lead < 0 && trail > 0) { 752 trail -= DIVISOR; 753 ++lead; 754 } 755 if (lead == 0) 756 (void) printf("%d", trail); 757 else (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail)); 758 } 759
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