zdump.c revision 1.31
1 /* $NetBSD: zdump.c,v 1.31 2013/09/20 19:06:54 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 1.31 2013/09/20 19:06:54 christos 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 PRIdMAX "lld" 66 # ifdef LLONG_MAX 67 # define INTMAX_MAX LLONG_MAX 68 # else 69 # define INTMAX_MAX __LONG_LONG_MAX__ 70 # endif 71 # else 72 typedef long intmax_t; 73 # define PRIdMAX "ld" 74 # define INTMAX_MAX LONG_MAX 75 # endif 76 #endif 77 #ifndef SCNdMAX 78 # define SCNdMAX PRIdMAX 79 #endif 80 81 82 #ifndef ZDUMP_LO_YEAR 83 #define ZDUMP_LO_YEAR (-500) 84 #endif /* !defined ZDUMP_LO_YEAR */ 85 86 #ifndef ZDUMP_HI_YEAR 87 #define ZDUMP_HI_YEAR 2500 88 #endif /* !defined ZDUMP_HI_YEAR */ 89 90 #ifndef MAX_STRING_LENGTH 91 #define MAX_STRING_LENGTH 1024 92 #endif /* !defined MAX_STRING_LENGTH */ 93 94 #ifndef TRUE 95 #define TRUE 1 96 #endif /* !defined TRUE */ 97 98 #ifndef FALSE 99 #define FALSE 0 100 #endif /* !defined FALSE */ 101 102 #ifndef EXIT_SUCCESS 103 #define EXIT_SUCCESS 0 104 #endif /* !defined EXIT_SUCCESS */ 105 106 #ifndef EXIT_FAILURE 107 #define EXIT_FAILURE 1 108 #endif /* !defined EXIT_FAILURE */ 109 110 #ifndef SECSPERMIN 111 #define SECSPERMIN 60 112 #endif /* !defined SECSPERMIN */ 113 114 #ifndef MINSPERHOUR 115 #define MINSPERHOUR 60 116 #endif /* !defined MINSPERHOUR */ 117 118 #ifndef SECSPERHOUR 119 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR) 120 #endif /* !defined SECSPERHOUR */ 121 122 #ifndef HOURSPERDAY 123 #define HOURSPERDAY 24 124 #endif /* !defined HOURSPERDAY */ 125 126 #ifndef EPOCH_YEAR 127 #define EPOCH_YEAR 1970 128 #endif /* !defined EPOCH_YEAR */ 129 130 #ifndef TM_YEAR_BASE 131 #define TM_YEAR_BASE 1900 132 #endif /* !defined TM_YEAR_BASE */ 133 134 #ifndef DAYSPERNYEAR 135 #define DAYSPERNYEAR 365 136 #endif /* !defined DAYSPERNYEAR */ 137 138 #ifndef isleap 139 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0)) 140 #endif /* !defined isleap */ 141 142 #ifndef isleap_sum 143 /* 144 ** See tzfile.h for details on isleap_sum. 145 */ 146 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400) 147 #endif /* !defined isleap_sum */ 148 149 #define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY) 150 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR) 151 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY) 152 #define SECSPER400YEARS (SECSPERNYEAR * (intmax_t) (300 + 3) \ 153 + SECSPERLYEAR * (intmax_t) (100 - 3)) 154 155 /* 156 ** True if SECSPER400YEARS is known to be representable as an 157 ** intmax_t. It's OK that SECSPER400YEARS_FITS can in theory be false 158 ** even if SECSPER400YEARS is representable, because when that happens 159 ** the code merely runs a bit more slowly, and this slowness doesn't 160 ** occur on any practical platform. 161 */ 162 enum { SECSPER400YEARS_FITS = SECSPERLYEAR <= INTMAX_MAX / 400 }; 163 164 #ifndef HAVE_GETTEXT 165 #define HAVE_GETTEXT 0 166 #endif 167 #if HAVE_GETTEXT 168 #include "locale.h" /* for setlocale */ 169 #include "libintl.h" 170 #endif /* HAVE_GETTEXT */ 171 172 #ifndef GNUC_or_lint 173 #ifdef lint 174 #define GNUC_or_lint 175 #else /* !defined lint */ 176 #ifdef __GNUC__ 177 #define GNUC_or_lint 178 #endif /* defined __GNUC__ */ 179 #endif /* !defined lint */ 180 #endif /* !defined GNUC_or_lint */ 181 182 #ifndef ATTRIBUTE_PURE 183 #if 2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__) 184 # define ATTRIBUTE_PURE __attribute__ ((ATTRIBUTE_PURE__)) 185 #else 186 # define ATTRIBUTE_PURE /* empty */ 187 #endif 188 #endif 189 190 #ifndef INITIALIZE 191 #ifdef GNUC_or_lint 192 #define INITIALIZE(x) ((x) = 0) 193 #else /* !defined GNUC_or_lint */ 194 #define INITIALIZE(x) 195 #endif /* !defined GNUC_or_lint */ 196 #endif /* !defined INITIALIZE */ 197 198 /* 199 ** For the benefit of GNU folk... 200 ** `_(MSGID)' uses the current locale's message library string for MSGID. 201 ** The default is to use gettext if available, and use MSGID otherwise. 202 */ 203 204 #ifndef _ 205 #if HAVE_GETTEXT 206 #define _(msgid) gettext(msgid) 207 #else /* !HAVE_GETTEXT */ 208 #define _(msgid) msgid 209 #endif /* !HAVE_GETTEXT */ 210 #endif /* !defined _ */ 211 212 #ifndef TZ_DOMAIN 213 #define TZ_DOMAIN "tz" 214 #endif /* !defined TZ_DOMAIN */ 215 216 extern char ** environ; 217 extern int getopt(int argc, char * const argv[], 218 const char * options); 219 extern char * optarg; 220 extern int optind; 221 222 /* The minimum and maximum finite time values. */ 223 static time_t absolute_min_time = 224 ((time_t) -1 < 0 225 ? (time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1) 226 : 0); 227 static time_t absolute_max_time = 228 ((time_t) -1 < 0 229 ? - (~ 0 < 0) - ((time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1)) 230 : -1); 231 static size_t longest; 232 static char * progname; 233 static int warned; 234 235 static const char * abbr(struct tm * tmp); 236 static void abbrok(const char * abbrp, const char * zone); 237 static intmax_t delta(struct tm * newp, struct tm * oldp) ATTRIBUTE_PURE; 238 static void dumptime(const struct tm * tmp); 239 static time_t hunt(char * name, time_t lot, time_t hit); 240 static void show(char * zone, time_t t, int v); 241 static const char * tformat(void); 242 static time_t yeartot(long y) ATTRIBUTE_PURE; 243 244 #ifndef TYPECHECK 245 #define my_localtime localtime 246 #else /* !defined TYPECHECK */ 247 static struct tm * 248 my_localtime(time_t *tp) 249 { 250 struct tm *tmp; 251 252 tmp = localtime(tp); 253 if (tp != NULL && tmp != NULL) { 254 struct tm tm; 255 time_t t; 256 257 tm = *tmp; 258 t = mktime(&tm); 259 if (t != *tp) { 260 (void) fflush(stdout); 261 (void) fprintf(stderr, "\n%s: ", progname); 262 (void) fprintf(stderr, tformat(), *tp); 263 (void) fprintf(stderr, " ->"); 264 (void) fprintf(stderr, " year=%d", tmp->tm_year); 265 (void) fprintf(stderr, " mon=%d", tmp->tm_mon); 266 (void) fprintf(stderr, " mday=%d", tmp->tm_mday); 267 (void) fprintf(stderr, " hour=%d", tmp->tm_hour); 268 (void) fprintf(stderr, " min=%d", tmp->tm_min); 269 (void) fprintf(stderr, " sec=%d", tmp->tm_sec); 270 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst); 271 (void) fprintf(stderr, " -> "); 272 (void) fprintf(stderr, tformat(), t); 273 (void) fprintf(stderr, "\n"); 274 } 275 } 276 return tmp; 277 } 278 #endif /* !defined TYPECHECK */ 279 280 static void 281 abbrok(const char *const abbrp, const char *const zone) 282 { 283 const char *cp; 284 const char *wp; 285 286 if (warned) 287 return; 288 cp = abbrp; 289 wp = NULL; 290 while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp)) 291 ++cp; 292 if (cp - abbrp == 0) 293 wp = _("lacks alphabetic at start"); 294 else if (cp - abbrp < 3) 295 wp = _("has fewer than 3 alphabetics"); 296 else if (cp - abbrp > 6) 297 wp = _("has more than 6 alphabetics"); 298 if (wp == NULL && (*cp == '+' || *cp == '-')) { 299 ++cp; 300 if (isascii((unsigned char) *cp) && 301 isdigit((unsigned char) *cp)) 302 if (*cp++ == '1' && *cp >= '0' && *cp <= '4') 303 ++cp; 304 if (*cp != '\0') 305 wp = _("differs from POSIX standard"); 306 } 307 if (wp == NULL) 308 return; 309 (void) fflush(stdout); 310 (void) fprintf(stderr, 311 _("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"), 312 progname, zone, abbrp, wp); 313 warned = TRUE; 314 } 315 316 __dead static void 317 usage(FILE *const stream, const int status) 318 { 319 (void) fprintf(stream, 320 _("%s: usage: %s [--version] [--help] [-{vV}] [-{ct} [lo,]hi] zonename ...\n" 321 "\n" 322 "Report bugs to %s.\n"), 323 progname, progname, REPORT_BUGS_TO); 324 exit(status); 325 } 326 327 int 328 main(int argc, char *argv[]) 329 { 330 int i; 331 int vflag; 332 int Vflag; 333 char * cutarg; 334 char * cuttimes; 335 time_t cutlotime; 336 time_t cuthitime; 337 char ** fakeenv; 338 time_t now; 339 time_t t; 340 time_t newt; 341 struct tm tm; 342 struct tm newtm; 343 struct tm * tmp; 344 struct tm * newtmp; 345 346 cutlotime = absolute_min_time; 347 cuthitime = absolute_max_time; 348 #if HAVE_GETTEXT 349 (void) setlocale(LC_ALL, ""); 350 #ifdef TZ_DOMAINDIR 351 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR); 352 #endif /* defined TEXTDOMAINDIR */ 353 (void) textdomain(TZ_DOMAIN); 354 #endif /* HAVE_GETTEXT */ 355 progname = argv[0]; 356 for (i = 1; i < argc; ++i) 357 if (strcmp(argv[i], "--version") == 0) { 358 (void) printf("zdump %s%s\n", PKGVERSION, TZVERSION); 359 exit(EXIT_SUCCESS); 360 } else if (strcmp(argv[i], "--help") == 0) { 361 usage(stdout, EXIT_SUCCESS); 362 } 363 vflag = Vflag = 0; 364 cutarg = cuttimes = NULL; 365 for (;;) 366 switch (getopt(argc, argv, "c:t:vV")) { 367 case 'c': cutarg = optarg; break; 368 case 't': cuttimes = optarg; break; 369 case 'v': vflag = 1; break; 370 case 'V': Vflag = 1; break; 371 case -1: 372 if (! (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) 373 goto arg_processing_done; 374 /* Fall through. */ 375 default: 376 usage(stderr, EXIT_FAILURE); 377 } 378 arg_processing_done:; 379 380 if (vflag | Vflag) { 381 intmax_t lo; 382 intmax_t hi; 383 char dummy; 384 intmax_t cutloyear = ZDUMP_LO_YEAR; 385 intmax_t cuthiyear = ZDUMP_HI_YEAR; 386 if (cutarg != NULL) { 387 if (sscanf(cutarg, "%"SCNdMAX"%c", &hi, &dummy) == 1) { 388 cuthiyear = hi; 389 } else if (sscanf(cutarg, "%"SCNdMAX",%"SCNdMAX"%c", 390 &lo, &hi, &dummy) == 2) { 391 cutloyear = lo; 392 cuthiyear = hi; 393 } else { 394 (void) fprintf(stderr, _("%s: wild -c argument %s\n"), 395 progname, cutarg); 396 exit(EXIT_FAILURE); 397 } 398 } 399 if (cutarg != NULL || cuttimes == NULL) { 400 cutlotime = yeartot(cutloyear); 401 cuthitime = yeartot(cuthiyear); 402 } 403 if (cuttimes != NULL) { 404 if (sscanf(cuttimes, "%"SCNdMAX"%c", &hi, &dummy) == 1) { 405 if (hi < cuthitime) { 406 if (hi < absolute_min_time) 407 hi = absolute_min_time; 408 cuthitime = hi; 409 } 410 } else if (sscanf(cuttimes, "%"SCNdMAX",%"SCNdMAX"%c", 411 &lo, &hi, &dummy) == 2) { 412 if (cutlotime < lo) { 413 if (absolute_max_time < lo) 414 lo = absolute_max_time; 415 cutlotime = lo; 416 } 417 if (hi < cuthitime) { 418 if (hi < absolute_min_time) 419 hi = absolute_min_time; 420 cuthitime = hi; 421 } 422 } else { 423 (void) fprintf(stderr, 424 _("%s: wild -t argument %s\n"), 425 progname, cuttimes); 426 exit(EXIT_FAILURE); 427 } 428 } 429 } 430 (void) time(&now); 431 longest = 0; 432 for (i = optind; i < argc; ++i) 433 if (strlen(argv[i]) > longest) 434 longest = strlen(argv[i]); 435 { 436 int from; 437 int to; 438 439 for (i = 0; environ[i] != NULL; ++i) 440 continue; 441 fakeenv = malloc((i + 2) * sizeof *fakeenv); 442 if (fakeenv == NULL || 443 (fakeenv[0] = malloc(longest + 4)) == NULL) { 444 err(EXIT_FAILURE, "Can't allocated %zu bytes", 445 longest + 4); 446 } 447 to = 0; 448 (void)strcpy(fakeenv[to++], "TZ="); /* XXX strcpy is safe */ 449 for (from = 0; environ[from] != NULL; ++from) 450 if (strncmp(environ[from], "TZ=", 3) != 0) 451 fakeenv[to++] = environ[from]; 452 fakeenv[to] = NULL; 453 environ = fakeenv; 454 } 455 for (i = optind; i < argc; ++i) { 456 static char buf[MAX_STRING_LENGTH]; 457 458 (void) strcpy(&fakeenv[0][3], argv[i]); /* XXX strcpy is safe */ 459 if (! (vflag | Vflag)) { 460 show(argv[i], now, FALSE); 461 continue; 462 } 463 warned = FALSE; 464 t = absolute_min_time; 465 if (!Vflag) { 466 show(argv[i], t, TRUE); 467 t += SECSPERDAY; 468 show(argv[i], t, TRUE); 469 } 470 if (t < cutlotime) 471 t = cutlotime; 472 tmp = my_localtime(&t); 473 if (tmp != NULL) { 474 tm = *tmp; 475 (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1); 476 } 477 for ( ; ; ) { 478 newt = (t < absolute_max_time - SECSPERDAY / 2 479 ? t + SECSPERDAY / 2 480 : absolute_max_time); 481 if (cuthitime <= newt) 482 break; 483 newtmp = localtime(&newt); 484 if (newtmp != NULL) 485 newtm = *newtmp; 486 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) : 487 (delta(&newtm, &tm) != (newt - t) || 488 newtm.tm_isdst != tm.tm_isdst || 489 strcmp(abbr(&newtm), buf) != 0)) { 490 newt = hunt(argv[i], t, newt); 491 newtmp = localtime(&newt); 492 if (newtmp != NULL) { 493 newtm = *newtmp; 494 (void) strncpy(buf, 495 abbr(&newtm), 496 (sizeof buf) - 1); 497 } 498 } 499 t = newt; 500 tm = newtm; 501 tmp = newtmp; 502 } 503 if (!Vflag) { 504 t = absolute_max_time; 505 t -= SECSPERDAY; 506 show(argv[i], t, TRUE); 507 t += SECSPERDAY; 508 show(argv[i], t, TRUE); 509 } 510 } 511 if (fflush(stdout) || ferror(stdout)) { 512 err(EXIT_FAILURE, _("Error writing standard output")); 513 } 514 exit(EXIT_SUCCESS); 515 /* If exit fails to exit... */ 516 return EXIT_FAILURE; 517 } 518 519 static time_t 520 yeartot(const long y) 521 { 522 intmax_t myy, seconds, years; 523 time_t t; 524 525 myy = EPOCH_YEAR; 526 t = 0; 527 while (myy < y) { 528 if (SECSPER400YEARS_FITS && 400 <= y - myy) { 529 intmax_t diff400 = (y - myy) / 400; 530 if (INTMAX_MAX / SECSPER400YEARS < diff400) 531 return absolute_max_time; 532 seconds = diff400 * SECSPER400YEARS; 533 years = diff400 * 400; 534 } else { 535 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR; 536 years = 1; 537 } 538 myy += years; 539 if (t > absolute_max_time - seconds) 540 return absolute_max_time; 541 t += seconds; 542 } 543 while (y < myy) { 544 if (SECSPER400YEARS_FITS && y + 400 <= myy && myy < 0) { 545 intmax_t diff400 = (myy - y) / 400; 546 if (INTMAX_MAX / SECSPER400YEARS < diff400) 547 return absolute_min_time; 548 seconds = diff400 * SECSPER400YEARS; 549 years = diff400 * 400; 550 } else { 551 seconds = isleap(myy - 1) ? SECSPERLYEAR : SECSPERNYEAR; 552 years = 1; 553 } 554 myy -= years; 555 if (t < absolute_min_time + seconds) 556 return absolute_min_time; 557 t -= seconds; 558 } 559 return t; 560 } 561 562 static time_t 563 hunt(char *name, time_t lot, time_t hit) 564 { 565 time_t t; 566 struct tm lotm; 567 struct tm * lotmp; 568 struct tm tm; 569 struct tm * tmp; 570 char loab[MAX_STRING_LENGTH]; 571 572 lotmp = my_localtime(&lot); 573 if (lotmp != NULL) { 574 lotm = *lotmp; 575 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1); 576 } 577 for ( ; ; ) { 578 time_t diff = hit - lot; 579 if (diff < 2) 580 break; 581 t = lot; 582 t += diff / 2; 583 if (t <= lot) 584 ++t; 585 else if (t >= hit) 586 --t; 587 tmp = my_localtime(&t); 588 if (tmp != NULL) 589 tm = *tmp; 590 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) : 591 (delta(&tm, &lotm) == (t - lot) && 592 tm.tm_isdst == lotm.tm_isdst && 593 strcmp(abbr(&tm), loab) == 0)) { 594 lot = t; 595 lotm = tm; 596 lotmp = tmp; 597 } else hit = t; 598 } 599 show(name, lot, TRUE); 600 show(name, hit, TRUE); 601 return hit; 602 } 603 604 /* 605 ** Thanks to Paul Eggert for logic used in delta. 606 */ 607 608 static intmax_t 609 delta(struct tm *newp, struct tm *oldp) 610 { 611 intmax_t result; 612 int tmy; 613 614 if (newp->tm_year < oldp->tm_year) 615 return -delta(oldp, newp); 616 result = 0; 617 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy) 618 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE); 619 result += newp->tm_yday - oldp->tm_yday; 620 result *= HOURSPERDAY; 621 result += newp->tm_hour - oldp->tm_hour; 622 result *= MINSPERHOUR; 623 result += newp->tm_min - oldp->tm_min; 624 result *= SECSPERMIN; 625 result += newp->tm_sec - oldp->tm_sec; 626 return result; 627 } 628 629 static void 630 show(char *zone, time_t t, int v) 631 { 632 struct tm * tmp; 633 634 (void) printf("%-*s ", (int) longest, zone); 635 if (v) { 636 tmp = gmtime(&t); 637 if (tmp == NULL) { 638 (void) printf(tformat(), t); 639 } else { 640 dumptime(tmp); 641 (void) printf(" UT"); 642 } 643 (void) printf(" = "); 644 } 645 tmp = my_localtime(&t); 646 dumptime(tmp); 647 if (tmp != NULL) { 648 if (*abbr(tmp) != '\0') 649 (void) printf(" %s", abbr(tmp)); 650 if (v) { 651 (void) printf(" isdst=%d", tmp->tm_isdst); 652 #ifdef TM_GMTOFF 653 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF); 654 #endif /* defined TM_GMTOFF */ 655 } 656 } 657 (void) printf("\n"); 658 if (tmp != NULL && *abbr(tmp) != '\0') 659 abbrok(abbr(tmp), zone); 660 } 661 662 static const char * 663 abbr(struct tm *tmp) 664 { 665 const char * result; 666 static const char nada; 667 668 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1) 669 return &nada; 670 result = tzname[tmp->tm_isdst]; 671 return (result == NULL) ? &nada : result; 672 } 673 674 /* 675 ** The code below can fail on certain theoretical systems; 676 ** it works on all known real-world systems as of 2004-12-30. 677 */ 678 679 static const char * 680 tformat(void) 681 { 682 if (0 > (time_t) -1) { /* signed */ 683 if (sizeof (time_t) == sizeof (intmax_t)) 684 return "%"PRIdMAX; 685 if (sizeof (time_t) > sizeof (long)) 686 return "%lld"; 687 if (sizeof (time_t) > sizeof (int)) 688 return "%ld"; 689 return "%d"; 690 } 691 #ifdef PRIuMAX 692 if (sizeof (time_t) == sizeof (uintmax_t)) 693 return "%"PRIuMAX; 694 #endif 695 if (sizeof (time_t) > sizeof (unsigned long)) 696 return "%llu"; 697 if (sizeof (time_t) > sizeof (unsigned int)) 698 return "%lu"; 699 return "%u"; 700 } 701 702 static void 703 dumptime(const struct tm *timeptr) 704 { 705 static const char wday_name[][3] = { 706 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" 707 }; 708 static const char mon_name[][3] = { 709 "Jan", "Feb", "Mar", "Apr", "May", "Jun", 710 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" 711 }; 712 const char * wn; 713 const char * mn; 714 int lead; 715 int trail; 716 717 if (timeptr == NULL) { 718 (void) printf("NULL"); 719 return; 720 } 721 /* 722 ** The packaged versions of localtime and gmtime never put out-of-range 723 ** values in tm_wday or tm_mon, but since this code might be compiled 724 ** with other (perhaps experimental) versions, paranoia is in order. 725 */ 726 if (timeptr->tm_wday < 0 || timeptr->tm_wday >= 727 (int) (sizeof wday_name / sizeof wday_name[0])) 728 wn = "???"; 729 else wn = wday_name[timeptr->tm_wday]; 730 if (timeptr->tm_mon < 0 || timeptr->tm_mon >= 731 (int) (sizeof mon_name / sizeof mon_name[0])) 732 mn = "???"; 733 else mn = mon_name[timeptr->tm_mon]; 734 (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ", 735 wn, mn, 736 timeptr->tm_mday, timeptr->tm_hour, 737 timeptr->tm_min, timeptr->tm_sec); 738 #define DIVISOR 10 739 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR; 740 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR + 741 trail / DIVISOR; 742 trail %= DIVISOR; 743 if (trail < 0 && lead > 0) { 744 trail += DIVISOR; 745 --lead; 746 } else if (lead < 0 && trail > 0) { 747 trail -= DIVISOR; 748 ++lead; 749 } 750 if (lead == 0) 751 (void) printf("%d", trail); 752 else (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail)); 753 } 754
Indexes created Sat Sep 20 22:09:52 GMT 2025