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1 /*
2 ** This file is in the public domain, so clarified as of
3 ** 2009-05-17 by Arthur David Olson.
4 */
5
6 #include "version.h"
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 ** However, include private.h when debugging, so that it overrides
14 ** time_t consistently with the rest of the package.
15 */
16
17 #ifdef time_tz
18 # include "private.h"
19 #endif
20
21 #include "stdio.h" /* for stdout, stderr, perror */
22 #include "string.h" /* for strcpy */
23 #include "sys/types.h" /* for time_t */
24 #include "time.h" /* for struct tm */
25 #include "stdlib.h" /* for exit, malloc, atoi */
26 #include "limits.h" /* for CHAR_BIT, LLONG_MAX */
27 #include "ctype.h" /* for isalpha et al. */
28
29 /* Enable extensions and modifications for ICU. */
30 #define ICU
31
32 #ifdef ICU
33 #include "dirent.h"
34 #endif
35
36 #ifndef isascii
37 #define isascii(x) 1
38 #endif /* !defined isascii */
39
40 /*
41 ** Substitutes for pre-C99 compilers.
42 ** Much of this section of code is stolen from private.h.
43 */
44
45 #ifndef HAVE_STDINT_H
46 # define HAVE_STDINT_H \
47 (199901 <= __STDC_VERSION__ || 2 < (__GLIBC__ + (0 < __GLIBC_MINOR__)))
48 #endif
49 #if HAVE_STDINT_H
50 # include "stdint.h"
51 #endif
52 #ifndef HAVE_INTTYPES_H
53 # define HAVE_INTTYPES_H HAVE_STDINT_H
54 #endif
55 #if HAVE_INTTYPES_H
56 # include <inttypes.h>
57 #endif
58
59 #ifndef INT_FAST32_MAX
60 # if INT_MAX >> 31 == 0
61 typedef long int_fast32_t;
62 # else
63 typedef int int_fast32_t;
64 # endif
65 #endif
66
67 #ifndef INTMAX_MAX
68 # if defined LLONG_MAX || defined __LONG_LONG_MAX__
69 typedef long long intmax_t;
70 # define strtoimax strtoll
71 # define PRIdMAX "lld"
72 # ifdef LLONG_MAX
73 # define INTMAX_MAX LLONG_MAX
74 # else
75 # define INTMAX_MAX __LONG_LONG_MAX__
76 # endif
77 # else
78 typedef long intmax_t;
79 # define strtoimax strtol
80 # define PRIdMAX "ld"
81 # define INTMAX_MAX LONG_MAX
82 # endif
83 #endif
84
85
86 #ifndef ZDUMP_LO_YEAR
87 #define ZDUMP_LO_YEAR (-500)
88 #endif /* !defined ZDUMP_LO_YEAR */
89
90 #ifndef ZDUMP_HI_YEAR
91 #define ZDUMP_HI_YEAR 2500
92 #endif /* !defined ZDUMP_HI_YEAR */
93
94 #ifndef MAX_STRING_LENGTH
95 #define MAX_STRING_LENGTH 1024
96 #endif /* !defined MAX_STRING_LENGTH */
97
98 #ifndef TRUE
99 #define TRUE 1
100 #endif /* !defined TRUE */
101
102 #ifndef FALSE
103 #define FALSE 0
104 #endif /* !defined FALSE */
105
106 #ifndef EXIT_SUCCESS
107 #define EXIT_SUCCESS 0
108 #endif /* !defined EXIT_SUCCESS */
109
110 #ifndef EXIT_FAILURE
111 #define EXIT_FAILURE 1
112 #endif /* !defined EXIT_FAILURE */
113
114 #ifndef SECSPERMIN
115 #define SECSPERMIN 60
116 #endif /* !defined SECSPERMIN */
117
118 #ifndef MINSPERHOUR
119 #define MINSPERHOUR 60
120 #endif /* !defined MINSPERHOUR */
121
122 #ifndef SECSPERHOUR
123 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
124 #endif /* !defined SECSPERHOUR */
125
126 #ifndef HOURSPERDAY
127 #define HOURSPERDAY 24
128 #endif /* !defined HOURSPERDAY */
129
130 #ifndef EPOCH_YEAR
131 #define EPOCH_YEAR 1970
132 #endif /* !defined EPOCH_YEAR */
133
134 #ifndef TM_YEAR_BASE
135 #define TM_YEAR_BASE 1900
136 #endif /* !defined TM_YEAR_BASE */
137
138 #ifndef DAYSPERNYEAR
139 #define DAYSPERNYEAR 365
140 #endif /* !defined DAYSPERNYEAR */
141
142 #ifndef isleap
143 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
144 #endif /* !defined isleap */
145
146 #ifndef isleap_sum
147 /*
148 ** See tzfile.h for details on isleap_sum.
149 */
150 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
151 #endif /* !defined isleap_sum */
152
153 #define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY)
154 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
155 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
156 #define SECSPER400YEARS (SECSPERNYEAR * (intmax_t) (300 + 3) \
157 + SECSPERLYEAR * (intmax_t) (100 - 3))
158
159 /*
160 ** True if SECSPER400YEARS is known to be representable as an
161 ** intmax_t. It's OK that SECSPER400YEARS_FITS can in theory be false
162 ** even if SECSPER400YEARS is representable, because when that happens
163 ** the code merely runs a bit more slowly, and this slowness doesn't
164 ** occur on any practical platform.
165 */
166 enum { SECSPER400YEARS_FITS = SECSPERLYEAR <= INTMAX_MAX / 400 };
167
168 #ifndef HAVE_GETTEXT
169 #define HAVE_GETTEXT 0
170 #endif
171 #if HAVE_GETTEXT
172 #include "locale.h" /* for setlocale */
173 #include "libintl.h"
174 #endif /* HAVE_GETTEXT */
175
176 #ifndef GNUC_or_lint
177 #ifdef lint
178 #define GNUC_or_lint
179 #else /* !defined lint */
180 #ifdef __GNUC__
181 #define GNUC_or_lint
182 #endif /* defined __GNUC__ */
183 #endif /* !defined lint */
184 #endif /* !defined GNUC_or_lint */
185
186 #if 2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__)
187 # define ATTRIBUTE_PURE __attribute__ ((__pure__))
188 #else
189 # define ATTRIBUTE_PURE /* empty */
190 #endif
191
192 /*
193 ** For the benefit of GNU folk...
194 ** `_(MSGID)' uses the current locale's message library string for MSGID.
195 ** The default is to use gettext if available, and use MSGID otherwise.
196 */
197
198 #ifndef _
199 #if HAVE_GETTEXT
200 #define _(msgid) gettext(msgid)
201 #else /* !HAVE_GETTEXT */
202 #define _(msgid) msgid
203 #endif /* !HAVE_GETTEXT */
204 #endif /* !defined _ */
205
206 #ifndef TZ_DOMAIN
207 #define TZ_DOMAIN "tz"
208 #endif /* !defined TZ_DOMAIN */
209
210 extern char ** environ;
211 extern int getopt(int argc, char * const argv[],
212 const char * options);
213 extern char * optarg;
214 extern int optind;
215 extern char * tzname[2];
216
217 /* The minimum and maximum finite time values. */
218 static time_t const absolute_min_time =
219 ((time_t) -1 < 0
220 ? (time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1)
221 : 0);
222 static time_t const absolute_max_time =
223 ((time_t) -1 < 0
224 ? - (~ 0 < 0) - ((time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1))
225 : -1);
226 static size_t longest;
227 static char * progname;
228 static int warned;
229
230 static char * abbr(struct tm * tmp);
231 static void abbrok(const char * abbrp, const char * zone);
232 static intmax_t delta(struct tm * newp, struct tm * oldp) ATTRIBUTE_PURE;
233 static void dumptime(const struct tm * tmp);
234 static time_t hunt(char * name, time_t lot, time_t hit);
235 static void show(char * zone, time_t t, int v);
236 static const char * tformat(void);
237 static time_t yeartot(intmax_t y) ATTRIBUTE_PURE;
238 #ifdef ICU
239 typedef struct listentry {
240 char * name;
241 struct listentry * next;
242 } listentry;
243
244 static time_t huntICU(char * name, time_t lot, time_t hit, FILE *fp);
245 static void dumptimeICU(FILE * fp, time_t t);
246 static void showICU(FILE * fp, char * zone, time_t t1, time_t t2);
247 static int getall(struct listentry ** namelist);
248 static void getzones(char * basedir, char * subdir, struct listentry ** last, int * count);
249 #endif
250
251 #ifndef TYPECHECK
252 #define my_localtime localtime
253 #else /* !defined TYPECHECK */
254 static struct tm *
255 my_localtime(time_t *tp)
256 {
257 register struct tm * tmp;
258
259 tmp = localtime(tp);
260 if (tp != NULL && tmp != NULL) {
261 struct tm tm;
262 register time_t t;
263
264 tm = *tmp;
265 t = mktime(&tm);
266 if (t != *tp) {
267 (void) fflush(stdout);
268 (void) fprintf(stderr, "\n%s: ", progname);
269 (void) fprintf(stderr, tformat(), *tp);
270 (void) fprintf(stderr, " ->");
271 (void) fprintf(stderr, " year=%d", tmp->tm_year);
272 (void) fprintf(stderr, " mon=%d", tmp->tm_mon);
273 (void) fprintf(stderr, " mday=%d", tmp->tm_mday);
274 (void) fprintf(stderr, " hour=%d", tmp->tm_hour);
275 (void) fprintf(stderr, " min=%d", tmp->tm_min);
276 (void) fprintf(stderr, " sec=%d", tmp->tm_sec);
277 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
278 (void) fprintf(stderr, " -> ");
279 (void) fprintf(stderr, tformat(), t);
280 (void) fprintf(stderr, "\n");
281 }
282 }
283 return tmp;
284 }
285 #endif /* !defined TYPECHECK */
286
287 static void
288 abbrok(const char *const abbrp, const char *const zone)
289 {
290 register const char * cp;
291 register const char * wp;
292
293 if (warned)
294 return;
295 cp = abbrp;
296 wp = NULL;
297 while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp))
298 ++cp;
299 if (cp - abbrp == 0)
300 wp = _("lacks alphabetic at start");
301 else if (cp - abbrp < 3)
302 wp = _("has fewer than 3 alphabetics");
303 else if (cp - abbrp > 6)
304 wp = _("has more than 6 alphabetics");
305 if (wp == NULL && (*cp == '+' || *cp == '-')) {
306 ++cp;
307 if (isascii((unsigned char) *cp) &&
308 isdigit((unsigned char) *cp))
309 if (*cp++ == '1' && *cp >= '0' && *cp <= '4')
310 ++cp;
311 if (*cp != '\0')
312 wp = _("differs from POSIX standard");
313 }
314 if (wp == NULL)
315 return;
316 (void) fflush(stdout);
317 (void) fprintf(stderr,
318 _("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"),
319 progname, zone, abbrp, wp);
320 warned = TRUE;
321 }
322
323 static void
324 usage(FILE * const stream, const int status)
325 {
326 (void) fprintf(stream,
327 _("%s: usage: %s [--version] [--help] [-{vV}] [-{ct} [lo,]hi] zonename ...\n"
328 "\n"
329 "Report bugs to %s.\n"),
330 progname, progname, REPORT_BUGS_TO);
331 exit(status);
332 }
333
334 int
335 main(int argc, char *argv[])
336 {
337 register int i;
338 register int vflag;
339 register int Vflag;
340 register char * cutarg;
341 register char * cuttimes;
342 register time_t cutlotime;
343 register time_t cuthitime;
344 register char ** fakeenv;
345 time_t now;
346 time_t t;
347 time_t newt;
348 struct tm tm;
349 struct tm newtm;
350 register struct tm * tmp;
351 register struct tm * newtmp;
352 #ifdef ICU
353 int nextopt;
354 char * dirarg;
355 int aflag;
356 int iflag;
357 listentry * namelist = NULL;
358 FILE * fp = stdout;
359 #endif
360
361 cutlotime = absolute_min_time;
362 cuthitime = absolute_max_time;
363 #if HAVE_GETTEXT
364 (void) setlocale(LC_ALL, "");
365 #ifdef TZ_DOMAINDIR
366 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
367 #endif /* defined TEXTDOMAINDIR */
368 (void) textdomain(TZ_DOMAIN);
369 #endif /* HAVE_GETTEXT */
370 progname = argv[0];
371 for (i = 1; i < argc; ++i)
372 if (strcmp(argv[i], "--version") == 0) {
373 (void) printf("zdump %s%s\n", PKGVERSION, TZVERSION);
374 exit(EXIT_SUCCESS);
375 } else if (strcmp(argv[i], "--help") == 0) {
376 usage(stdout, EXIT_SUCCESS);
377 }
378 vflag = Vflag = 0;
379 cutarg = cuttimes = NULL;
380 #ifdef ICU
381 aflag = 0;
382 iflag = 0;
383 dirarg = NULL;
384 for (;;)
385 switch(getopt(argc, argv, "ac:d:it:vV")) {
386 case 'a': aflag = 1; break;
387 case 'c': cutarg = optarg; break;
388 case 'd': dirarg = optarg; break;
389 case 'i': iflag = 1; break;
390 case 't': cuttimes = optarg; break;
391 case 'v': vflag = 1; break;
392 case 'V': Vflag = 1; break;
393 case -1:
394 if (! (optind == argc - 1 && strcmp(argv[optind], "=") == 0))
395 goto arg_processing_done;
396 /* Fall through. */
397 default:
398 (void) fprintf(stderr,
399 _("%s: usage is %s [ --version ] [ -a ] [ -v ] [ -V ] [ -i ] [ -c [loyear,]hiyear ] [ -t [lotime,]hitime] ][ -d dir ] [ zonename ... ]\n"),
400 progname, progname);
401 exit(EXIT_FAILURE);
402 }
403 #else
404 for (;;)
405 switch (getopt(argc, argv, "c:t:vV")) {
406 case 'c': cutarg = optarg; break;
407 case 't': cuttimes = optarg; break;
408 case 'v': vflag = 1; break;
409 case 'V': Vflag = 1; break;
410 case -1:
411 if (! (optind == argc - 1 && strcmp(argv[optind], "=") == 0))
412 goto arg_processing_done;
413 /* Fall through. */
414 default:
415 usage(stderr, EXIT_FAILURE);
416 }
417 #endif
418 arg_processing_done:;
419
420 #ifdef ICU
421 if (dirarg != NULL) {
422 DIR * dp;
423 /* create the output directory */
424 mkdir(dirarg, 0777);
425 if ((dp = opendir(dirarg)) == NULL) {
426 fprintf(stderr, "cannot create the target directory");
427 exit(EXIT_FAILURE);
428 }
429 closedir(dp);
430 }
431 #endif ICU
432
433 if (vflag | Vflag) {
434 intmax_t lo;
435 intmax_t hi;
436 char *loend, *hiend;
437 register intmax_t cutloyear = ZDUMP_LO_YEAR;
438 register intmax_t cuthiyear = ZDUMP_HI_YEAR;
439 if (cutarg != NULL) {
440 lo = strtoimax(cutarg, &loend, 10);
441 if (cutarg != loend && !*loend) {
442 hi = lo;
443 cuthiyear = hi;
444 } else if (cutarg != loend && *loend == ','
445 && (hi = strtoimax(loend + 1, &hiend, 10),
446 loend + 1 != hiend && !*hiend)) {
447 cutloyear = lo;
448 cuthiyear = hi;
449 } else {
450 (void) fprintf(stderr, _("%s: wild -c argument %s\n"),
451 progname, cutarg);
452 exit(EXIT_FAILURE);
453 }
454 }
455 if (cutarg != NULL || cuttimes == NULL) {
456 cutlotime = yeartot(cutloyear);
457 cuthitime = yeartot(cuthiyear);
458 }
459 if (cuttimes != NULL) {
460 lo = strtoimax(cuttimes, &loend, 10);
461 if (cuttimes != loend && !*loend) {
462 hi = lo;
463 if (hi < cuthitime) {
464 if (hi < absolute_min_time)
465 hi = absolute_min_time;
466 cuthitime = hi;
467 }
468 } else if (cuttimes != loend && *loend == ','
469 && (hi = strtoimax(loend + 1, &hiend, 10),
470 loend + 1 != hiend && !*hiend)) {
471 if (cutlotime < lo) {
472 if (absolute_max_time < lo)
473 lo = absolute_max_time;
474 cutlotime = lo;
475 }
476 if (hi < cuthitime) {
477 if (hi < absolute_min_time)
478 hi = absolute_min_time;
479 cuthitime = hi;
480 }
481 } else {
482 (void) fprintf(stderr,
483 _("%s: wild -t argument %s\n"),
484 progname, cuttimes);
485 exit(EXIT_FAILURE);
486 }
487 }
488 }
489
490 #ifdef ICU
491 if (aflag) {
492 /* get all available zones */
493 char ** fakeargv;
494 int i;
495 int count;
496
497 count = getall(&namelist);
498
499 fakeargv = (char **) malloc((size_t) (argc + count) * sizeof *argv);
500 /*
501 if ((fakeargv = (char **) malloc((size_t) (argc + count) * sizeof *argv)) == NULL) {
502 exit(EXIT_FAILURE);
503 }
504 */
505 for (i = 0; i < argc; i++) {
506 fakeargv[i] = argv[i];
507 }
508 for (i = 0; i < count; i++) {
509 fakeargv[i + argc] = namelist->name;
510 namelist = namelist->next;
511 }
512 argv = fakeargv;
513 argc += count;
514 }
515 #endif
516 (void) time(&now);
517 longest = 0;
518 for (i = optind; i < argc; ++i)
519 if (strlen(argv[i]) > longest)
520 longest = strlen(argv[i]);
521 {
522 register int from;
523 register int to;
524
525 for (i = 0; environ[i] != NULL; ++i)
526 continue;
527 fakeenv = malloc((i + 2) * sizeof *fakeenv);
528 if (fakeenv == NULL
529 || (fakeenv[0] = malloc(longest + 4)) == NULL) {
530 (void) perror(progname);
531 exit(EXIT_FAILURE);
532 }
533 to = 0;
534 (void) strcpy(fakeenv[to++], "TZ=");
535 for (from = 0; environ[from] != NULL; ++from)
536 if (strncmp(environ[from], "TZ=", 3) != 0)
537 fakeenv[to++] = environ[from];
538 fakeenv[to] = NULL;
539 environ = fakeenv;
540 }
541 for (i = optind; i < argc; ++i) {
542 static char buf[MAX_STRING_LENGTH];
543
544 (void) strcpy(&fakeenv[0][3], argv[i]);
545 if (! (vflag | Vflag)) {
546 show(argv[i], now, FALSE);
547 continue;
548 }
549 #ifdef ICU
550 fp = NULL;
551 if (iflag) {
552 if (dirarg == NULL) {
553 /* we want to display a zone name here */
554 if (i != optind) {
555 printf("\n");
556 }
557 printf("ZONE: %s\n", argv[i]);
558 } else {
559 int zstart;
560 char path[FILENAME_MAX + 1];
561 strcpy(path, dirarg);
562 strcat(path, "/");
563 zstart = strlen(path);
564 strcat(path, argv[i]);
565 /* replace '/' with '-' */
566 while(path[++zstart] != 0) {
567 if (path[zstart] == '/') {
568 path[zstart] = '-';
569 }
570 }
571 if ((fp = fopen(path, "w")) == NULL) {
572 fprintf(stderr, "cannot create output file %s\n", path);
573 exit(EXIT_FAILURE);
574 }
575 }
576 }
577 #endif
578 warned = FALSE;
579 t = absolute_min_time;
580 #ifdef ICU
581 /* skip displaying info for the lowest time, which is actually not
582 * a transition when -i option is set */
583 if (!iflag) {
584 #endif
585 if (!Vflag) {
586 show(argv[i], t, TRUE);
587 t += SECSPERDAY;
588 show(argv[i], t, TRUE);
589 }
590 #ifdef ICU
591 }
592 #endif
593 if (t < cutlotime)
594 t = cutlotime;
595 tmp = my_localtime(&t);
596 if (tmp != NULL) {
597 tm = *tmp;
598 (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
599 }
600 for ( ; ; ) {
601 newt = (t < absolute_max_time - SECSPERDAY / 2
602 ? t + SECSPERDAY / 2
603 : absolute_max_time);
604 if (cuthitime <= newt)
605 break;
606 newtmp = localtime(&newt);
607 if (newtmp != NULL)
608 newtm = *newtmp;
609 #ifdef ICU
610 if (iflag) {
611 /* We do not want to capture transitions just for
612 * abbreviated zone name changes */
613 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
614 (delta(&newtm, &tm) != (newt - t) ||
615 newtm.tm_isdst != tm.tm_isdst)) {
616 newt = huntICU(argv[i], t, newt, fp);
617 newtmp = localtime(&newt);
618 if (newtmp != NULL) {
619 newtm = *newtmp;
620 (void) strncpy(buf,
621 abbr(&newtm),
622 (sizeof buf) - 1);
623 }
624 }
625 } else {
626 #endif
627 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
628 (delta(&newtm, &tm) != (newt - t) ||
629 newtm.tm_isdst != tm.tm_isdst ||
630 strcmp(abbr(&newtm), buf) != 0)) {
631 newt = hunt(argv[i], t, newt);
632 newtmp = localtime(&newt);
633 if (newtmp != NULL) {
634 newtm = *newtmp;
635 (void) strncpy(buf,
636 abbr(&newtm),
637 (sizeof buf) - 1);
638 }
639 }
640 #ifdef ICU
641 }
642 #endif
643 t = newt;
644 tm = newtm;
645 tmp = newtmp;
646 }
647 #ifdef ICU
648 if (!iflag) {
649 /* skip displaying info for the highest time, which is actually not
650 * a transition when -i option is used*/
651 #endif
652 if (!Vflag) {
653 t = absolute_max_time;
654 t -= SECSPERDAY;
655 show(argv[i], t, TRUE);
656 t += SECSPERDAY;
657 show(argv[i], t, TRUE);
658 }
659 #ifdef ICU
660 }
661 /* close file */
662 if (fp != NULL) {
663 fclose(fp);
664 }
665 #endif
666 }
667 if (fflush(stdout) || ferror(stdout)) {
668 (void) fprintf(stderr, "%s: ", progname);
669 (void) perror(_("Error writing to standard output"));
670 exit(EXIT_FAILURE);
671 }
672 #ifdef ICU
673 if (aflag) {
674 struct listentry * entry = namelist;
675 struct listentry * next;
676 while (entry != NULL) {
677 free(entry->name);
678 next = entry->next;
679 free(entry);
680 entry = next;
681 }
682 }
683 #endif
684 exit(EXIT_SUCCESS);
685 /* If exit fails to exit... */
686 return EXIT_FAILURE;
687 }
688
689 static time_t
690 yeartot(const intmax_t y)
691 {
692 register intmax_t myy, seconds, years;
693 register time_t t;
694
695 myy = EPOCH_YEAR;
696 t = 0;
697 while (myy < y) {
698 if (SECSPER400YEARS_FITS && 400 <= y - myy) {
699 intmax_t diff400 = (y - myy) / 400;
700 if (INTMAX_MAX / SECSPER400YEARS < diff400)
701 return absolute_max_time;
702 seconds = diff400 * SECSPER400YEARS;
703 years = diff400 * 400;
704 } else {
705 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
706 years = 1;
707 }
708 myy += years;
709 if (t > absolute_max_time - seconds)
710 return absolute_max_time;
711 t += seconds;
712 }
713 while (y < myy) {
714 if (SECSPER400YEARS_FITS && y + 400 <= myy && myy < 0) {
715 intmax_t diff400 = (myy - y) / 400;
716 if (INTMAX_MAX / SECSPER400YEARS < diff400)
717 return absolute_min_time;
718 seconds = diff400 * SECSPER400YEARS;
719 years = diff400 * 400;
720 } else {
721 seconds = isleap(myy - 1) ? SECSPERLYEAR : SECSPERNYEAR;
722 years = 1;
723 }
724 myy -= years;
725 if (t < absolute_min_time + seconds)
726 return absolute_min_time;
727 t -= seconds;
728 }
729 return t;
730 }
731
732 static time_t
733 hunt(char *name, time_t lot, time_t hit)
734 {
735 time_t t;
736 struct tm lotm;
737 register struct tm * lotmp;
738 struct tm tm;
739 register struct tm * tmp;
740 char loab[MAX_STRING_LENGTH];
741
742 lotmp = my_localtime(&lot);
743 if (lotmp != NULL) {
744 lotm = *lotmp;
745 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
746 }
747 for ( ; ; ) {
748 time_t diff = hit - lot;
749 if (diff < 2)
750 break;
751 t = lot;
752 t += diff / 2;
753 if (t <= lot)
754 ++t;
755 else if (t >= hit)
756 --t;
757 tmp = my_localtime(&t);
758 if (tmp != NULL)
759 tm = *tmp;
760 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
761 (delta(&tm, &lotm) == (t - lot) &&
762 tm.tm_isdst == lotm.tm_isdst &&
763 strcmp(abbr(&tm), loab) == 0)) {
764 lot = t;
765 lotm = tm;
766 lotmp = tmp;
767 } else hit = t;
768 }
769 show(name, lot, TRUE);
770 show(name, hit, TRUE);
771 return hit;
772 }
773
774 /*
775 ** Thanks to Paul Eggert for logic used in delta.
776 */
777
778 static intmax_t
779 delta(struct tm * newp, struct tm *oldp)
780 {
781 register intmax_t result;
782 register int tmy;
783
784 if (newp->tm_year < oldp->tm_year)
785 return -delta(oldp, newp);
786 result = 0;
787 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
788 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
789 result += newp->tm_yday - oldp->tm_yday;
790 result *= HOURSPERDAY;
791 result += newp->tm_hour - oldp->tm_hour;
792 result *= MINSPERHOUR;
793 result += newp->tm_min - oldp->tm_min;
794 result *= SECSPERMIN;
795 result += newp->tm_sec - oldp->tm_sec;
796 return result;
797 }
798
799 static void
800 show(char *zone, time_t t, int v)
801 {
802 register struct tm * tmp;
803
804 (void) printf("%-*s ", (int) longest, zone);
805 if (v) {
806 tmp = gmtime(&t);
807 if (tmp == NULL) {
808 (void) printf(tformat(), t);
809 } else {
810 dumptime(tmp);
811 (void) printf(" UT");
812 }
813 (void) printf(" = ");
814 }
815 tmp = my_localtime(&t);
816 dumptime(tmp);
817 if (tmp != NULL) {
818 if (*abbr(tmp) != '\0')
819 (void) printf(" %s", abbr(tmp));
820 if (v) {
821 (void) printf(" isdst=%d", tmp->tm_isdst);
822 #ifdef TM_GMTOFF
823 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
824 #endif /* defined TM_GMTOFF */
825 }
826 }
827 (void) printf("\n");
828 if (tmp != NULL && *abbr(tmp) != '\0')
829 abbrok(abbr(tmp), zone);
830 }
831
832 static char *
833 abbr(struct tm *tmp)
834 {
835 register char * result;
836 static char nada;
837
838 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
839 return &nada;
840 result = tzname[tmp->tm_isdst];
841 return (result == NULL) ? &nada : result;
842 }
843
844 /*
845 ** The code below can fail on certain theoretical systems;
846 ** it works on all known real-world systems as of 2004-12-30.
847 */
848
849 static const char *
850 tformat(void)
851 {
852 if (0 > (time_t) -1) { /* signed */
853 if (sizeof (time_t) == sizeof (intmax_t))
854 return "%"PRIdMAX;
855 if (sizeof (time_t) > sizeof (long))
856 return "%lld";
857 if (sizeof (time_t) > sizeof (int))
858 return "%ld";
859 return "%d";
860 }
861 #ifdef PRIuMAX
862 if (sizeof (time_t) == sizeof (uintmax_t))
863 return "%"PRIuMAX;
864 #endif
865 if (sizeof (time_t) > sizeof (unsigned long))
866 return "%llu";
867 if (sizeof (time_t) > sizeof (unsigned int))
868 return "%lu";
869 return "%u";
870 }
871
872 static void
873 dumptime(register const struct tm *timeptr)
874 {
875 static const char wday_name[][3] = {
876 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
877 };
878 static const char mon_name[][3] = {
879 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
880 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
881 };
882 register const char * wn;
883 register const char * mn;
884 register int lead;
885 register int trail;
886
887 if (timeptr == NULL) {
888 (void) printf("NULL");
889 return;
890 }
891 /*
892 ** The packaged versions of localtime and gmtime never put out-of-range
893 ** values in tm_wday or tm_mon, but since this code might be compiled
894 ** with other (perhaps experimental) versions, paranoia is in order.
895 */
896 if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
897 (int) (sizeof wday_name / sizeof wday_name[0]))
898 wn = "???";
899 else wn = wday_name[timeptr->tm_wday];
900 if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
901 (int) (sizeof mon_name / sizeof mon_name[0]))
902 mn = "???";
903 else mn = mon_name[timeptr->tm_mon];
904 (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
905 wn, mn,
906 timeptr->tm_mday, timeptr->tm_hour,
907 timeptr->tm_min, timeptr->tm_sec);
908 #define DIVISOR 10
909 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
910 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
911 trail / DIVISOR;
912 trail %= DIVISOR;
913 if (trail < 0 && lead > 0) {
914 trail += DIVISOR;
915 --lead;
916 } else if (lead < 0 && trail > 0) {
917 trail -= DIVISOR;
918 ++lead;
919 }
920 if (lead == 0)
921 (void) printf("%d", trail);
922 else (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
923 }
924
925 #ifdef ICU
926 static time_t
927 huntICU(char *name, time_t lot, time_t hit, FILE * fp)
928 {
929 time_t t;
930 long diff;
931 struct tm lotm;
932 register struct tm * lotmp;
933 struct tm tm;
934 register struct tm * tmp;
935 char loab[MAX_STRING_LENGTH];
936
937 lotmp = my_localtime(&lot);
938 if (lotmp != NULL) {
939 lotm = *lotmp;
940 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
941 }
942 for ( ; ; ) {
943 diff = (long) (hit - lot);
944 if (diff < 2)
945 break;
946 t = lot;
947 t += diff / 2;
948 if (t <= lot)
949 ++t;
950 else if (t >= hit)
951 --t;
952 tmp = my_localtime(&t);
953 if (tmp != NULL)
954 tm = *tmp;
955 /* We do not want to capture transitions just for
956 * abbreviated zone name changes */
957 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
958 (delta(&tm, &lotm) == (t - lot) &&
959 tm.tm_isdst == lotm.tm_isdst)) {
960 lot = t;
961 lotm = tm;
962 lotmp = tmp;
963 } else hit = t;
964 }
965 showICU(fp, name, lot, hit);
966 return hit;
967 }
968
969 static void showICU(FILE * fp, char *zone, time_t t1, time_t t2)
970 {
971 if (fp == NULL) {
972 fp = stdout;
973 }
974 dumptimeICU(fp, t1);
975 fprintf(fp, " > ");
976 dumptimeICU(fp, t2);
977 fprintf(fp, "\n");
978 }
979
980 static void dumptimeICU(FILE * fp, time_t t)
981 {
982 static const char wday_name[][3] = {
983 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
984 };
985 struct tm gmt;
986 struct tm loc;
987 register int lead;
988 register int trail;
989 long offset;
990 long hour, min, sec;
991
992 loc = *my_localtime(&t);
993
994 trail = loc.tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
995 lead = loc.tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR + trail / DIVISOR;
996 trail %= DIVISOR;
997 if (trail < 0 && lead > 0) {
998 trail += DIVISOR;
999 --lead;
1000 } else if (lead < 0 && trail > 0) {
1001 trail -= DIVISOR;
1002 ++lead;
1003 }
1004
1005 fprintf(fp, "%04d-%02d-%02d", lead * DIVISOR + trail, loc.tm_mon + 1, loc.tm_mday);
1006 fprintf(fp, " %.3s ", wday_name[loc.tm_wday]);
1007 fprintf(fp, "%02d:%02d:%02d", loc.tm_hour, loc.tm_min, loc.tm_sec);
1008
1009 gmt = *gmtime(&t);
1010 offset = delta(&loc, &gmt);
1011 if (offset < 0) {
1012 offset = -offset;
1013 fprintf(fp, "-");
1014 } else {
1015 fprintf(fp, "+");
1016 }
1017
1018 sec = offset % 60;
1019 offset = (offset - sec) / 60;
1020 min = offset % 60;
1021 hour = offset / 60;
1022
1023 fprintf(fp, "%02d", hour);
1024 fprintf(fp, "%02d", min);
1025 fprintf(fp, "%02d", sec);
1026 fprintf(fp, "[DST=%d]", loc.tm_isdst);
1027 }
1028
1029 static int getall(struct listentry ** namelist) {
1030 int count = 0;
1031 struct listentry dummyentry;
1032 struct listentry * last = &dummyentry;
1033
1034 getzones(TZDIR, NULL, &last, &count);
1035 if (count > 0) {
1036 *namelist = dummyentry.next;
1037 }
1038
1039 return count;
1040 }
1041
1042 static void getzones(char * basedir, char * relpath, struct listentry ** last, int * count) {
1043 char path[FILENAME_MAX + 1];
1044 struct dirent * dir;
1045 DIR * dp;
1046
1047 strcpy(path, basedir);
1048 if (relpath != NULL) {
1049 strcat(path, "/");
1050 strcat(path, relpath);
1051 }
1052
1053 if ((dp = opendir(path)) == NULL) {
1054 /* file */
1055 if (strstr(relpath, ".tab") == NULL && strcmp(relpath, "Etc/Unknown") != 0) {
1056 char * pzonename;
1057 listentry * pentry;
1058
1059 if ((pzonename = malloc(strlen(relpath) + 1)) == NULL) {
1060 exit(EXIT_FAILURE);
1061 }
1062 strcpy(pzonename, relpath);
1063
1064 if ((pentry = malloc(sizeof(listentry))) == NULL) {
1065 exit(EXIT_FAILURE);
1066 }
1067
1068 pentry->name = pzonename;
1069 pentry->next = NULL;
1070 (*last)->next = pentry;
1071 *last = pentry;
1072 (*count)++;
1073 }
1074 } else {
1075 /* directory */
1076 while ((dir = readdir(dp)) != NULL) {
1077 char subpath[FILENAME_MAX + 1];
1078
1079 if (strcmp(dir->d_name, ".") == 0
1080 || strcmp(dir->d_name, "..") == 0) {
1081 continue;
1082 }
1083 if (relpath != NULL) {
1084 strcpy(subpath, relpath);
1085 strcat(subpath, "/");
1086 strcat(subpath, dir->d_name);
1087 } else {
1088 strcpy(subpath, dir->d_name);
1089 }
1090 getzones(basedir, subpath, last, count);
1091 }
1092 closedir(dp);
1093 }
1094 }
1095 #endif
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