1 /*
2 ** This file is in the public domain, so clarified as of
3 ** 2009-05-17 by Arthur David Olson.
4 */
5
6 #ifndef lint
7 static const char rcsid[] =
8 "$FreeBSD$";
9 static char elsieid[] = "@(#)zdump.c 8.10";
10 #endif /* not lint */
11
12 /*
13 ** This code has been made independent of the rest of the time
14 ** conversion package to increase confidence in the verification it provides.
15 ** You can use this code to help in verifying other implementations.
16 */
17
18 #include <err.h>
19 #include <stdio.h> /* for stdout, stderr */
20 #include <stdlib.h> /* for exit, malloc, atoi */
21 #include <string.h> /* for strcpy */
22 #include <sys/types.h> /* for time_t */
23 #include <time.h> /* for struct tm */
24 #include <unistd.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 #ifndef ZDUMP_LO_YEAR
32 #define ZDUMP_LO_YEAR (-500)
33 #endif /* !defined ZDUMP_LO_YEAR */
34
35 #ifndef ZDUMP_HI_YEAR
36 #define ZDUMP_HI_YEAR 2500
37 #endif /* !defined ZDUMP_HI_YEAR */
38
39 #ifndef MAX_STRING_LENGTH
40 #define MAX_STRING_LENGTH 1024
41 #endif /* !defined MAX_STRING_LENGTH */
42
43 #ifndef TRUE
44 #define TRUE 1
45 #endif /* !defined TRUE */
46
47 #ifndef FALSE
48 #define FALSE 0
49 #endif /* !defined FALSE */
50
51 #ifndef EXIT_SUCCESS
52 #define EXIT_SUCCESS 0
53 #endif /* !defined EXIT_SUCCESS */
54
55 #ifndef EXIT_FAILURE
56 #define EXIT_FAILURE 1
57 #endif /* !defined EXIT_FAILURE */
58
59 #ifndef SECSPERMIN
60 #define SECSPERMIN 60
61 #endif /* !defined SECSPERMIN */
62
63 #ifndef MINSPERHOUR
64 #define MINSPERHOUR 60
65 #endif /* !defined MINSPERHOUR */
66
67 #ifndef SECSPERHOUR
68 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
69 #endif /* !defined SECSPERHOUR */
70
71 #ifndef HOURSPERDAY
72 #define HOURSPERDAY 24
73 #endif /* !defined HOURSPERDAY */
74
75 #ifndef EPOCH_YEAR
76 #define EPOCH_YEAR 1970
77 #endif /* !defined EPOCH_YEAR */
78
79 #ifndef TM_YEAR_BASE
80 #define TM_YEAR_BASE 1900
81 #endif /* !defined TM_YEAR_BASE */
82
83 #ifndef DAYSPERNYEAR
84 #define DAYSPERNYEAR 365
85 #endif /* !defined DAYSPERNYEAR */
86
87 #ifndef isleap
88 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
89 #endif /* !defined isleap */
90
91 #ifndef isleap_sum
92 /*
93 ** See tzfile.h for details on isleap_sum.
94 */
95 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
96 #endif /* !defined isleap_sum */
97
98 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
99 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
100 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
101
102 #ifndef HAVE_GETTEXT
103 #define HAVE_GETTEXT 0
104 #endif
105 #if HAVE_GETTEXT
106 #include "locale.h" /* for setlocale */
107 #include "libintl.h"
108 #endif /* HAVE_GETTEXT */
109
110 #ifndef GNUC_or_lint
111 #ifdef lint
112 #define GNUC_or_lint
113 #else /* !defined lint */
114 #ifdef __GNUC__
115 #define GNUC_or_lint
116 #endif /* defined __GNUC__ */
117 #endif /* !defined lint */
118 #endif /* !defined GNUC_or_lint */
119
120 #ifndef INITIALIZE
121 #ifdef GNUC_or_lint
122 #define INITIALIZE(x) ((x) = 0)
123 #else /* !defined GNUC_or_lint */
124 #define INITIALIZE(x)
125 #endif /* !defined GNUC_or_lint */
126 #endif /* !defined INITIALIZE */
127
128 /*
129 ** For the benefit of GNU folk...
130 ** `_(MSGID)' uses the current locale's message library string for MSGID.
131 ** The default is to use gettext if available, and use MSGID otherwise.
132 */
133
134 #ifndef _
135 #if HAVE_GETTEXT
136 #define _(msgid) gettext(msgid)
137 #else /* !(HAVE_GETTEXT) */
138 #define _(msgid) msgid
139 #endif /* !(HAVE_GETTEXT) */
140 #endif /* !defined _ */
141
142 #ifndef TZ_DOMAIN
143 #define TZ_DOMAIN "tz"
144 #endif /* !defined TZ_DOMAIN */
145
146 extern char ** environ;
147 extern char * tzname[2];
148
149 static time_t absolute_min_time;
150 static time_t absolute_max_time;
151 static size_t longest;
152 static char * progname;
153 static int warned;
154
155 static void usage(FILE *stream, int status);
156 static char * abbr(struct tm * tmp);
157 static void abbrok(const char * abbrp, const char * zone);
158 static long delta(struct tm * newp, struct tm * oldp);
159 static void dumptime(const struct tm * tmp);
160 static time_t hunt(char * name, time_t lot, time_t hit);
161 static void setabsolutes(void);
162 static void show(char * zone, time_t t, int v);
163 static const char * tformat(void);
164 static time_t yeartot(long y);
165
166 #ifndef TYPECHECK
167 #define my_localtime localtime
168 #else /* !defined TYPECHECK */
169 static struct tm *
my_localtime(tp)170 my_localtime(tp)
171 time_t * tp;
172 {
173 register struct tm * tmp;
174
175 tmp = localtime(tp);
176 if (tp != NULL && tmp != NULL) {
177 struct tm tm;
178 register time_t t;
179
180 tm = *tmp;
181 t = mktime(&tm);
182 if (t - *tp >= 1 || *tp - t >= 1) {
183 (void) fflush(stdout);
184 (void) fprintf(stderr, "\n%s: ", progname);
185 (void) fprintf(stderr, tformat(), *tp);
186 (void) fprintf(stderr, " ->");
187 (void) fprintf(stderr, " year=%d", tmp->tm_year);
188 (void) fprintf(stderr, " mon=%d", tmp->tm_mon);
189 (void) fprintf(stderr, " mday=%d", tmp->tm_mday);
190 (void) fprintf(stderr, " hour=%d", tmp->tm_hour);
191 (void) fprintf(stderr, " min=%d", tmp->tm_min);
192 (void) fprintf(stderr, " sec=%d", tmp->tm_sec);
193 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
194 (void) fprintf(stderr, " -> ");
195 (void) fprintf(stderr, tformat(), t);
196 (void) fprintf(stderr, "\n");
197 }
198 }
199 return tmp;
200 }
201 #endif /* !defined TYPECHECK */
202
203 static void
abbrok(abbrp,zone)204 abbrok(abbrp, zone)
205 const char * const abbrp;
206 const char * const zone;
207 {
208 register const char * cp;
209 register char * wp;
210
211 if (warned)
212 return;
213 cp = abbrp;
214 wp = NULL;
215 while (isascii((unsigned char) *cp) &&
216 (isalnum((unsigned char)*cp) || *cp == '-' || *cp == '+'))
217 ++cp;
218 if (cp - abbrp < 3)
219 wp = _("has fewer than 3 characters");
220 else if (cp - abbrp > 6)
221 wp = _("has more than 6 characters");
222 else if (*cp)
223 wp = "has characters other than ASCII alphanumerics, '-' or '+'";
224 else
225 return;
226 (void) fflush(stdout);
227 (void) fprintf(stderr,
228 _("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"),
229 progname, zone, abbrp, wp);
230 warned = TRUE;
231 }
232
233 int
main(argc,argv)234 main(argc, argv)
235 int argc;
236 char * argv[];
237 {
238 register int i;
239 register int c;
240 register int vflag;
241 register char * cutarg;
242 register long cutloyear = ZDUMP_LO_YEAR;
243 register long cuthiyear = ZDUMP_HI_YEAR;
244 register time_t cutlotime;
245 register time_t cuthitime;
246 register char ** fakeenv;
247 time_t now;
248 time_t t;
249 time_t newt;
250 struct tm tm;
251 struct tm newtm;
252 register struct tm * tmp;
253 register struct tm * newtmp;
254
255 progname=argv[0];
256 INITIALIZE(cutlotime);
257 INITIALIZE(cuthitime);
258 #if HAVE_GETTEXT
259 (void) setlocale(LC_MESSAGES, "");
260 #ifdef TZ_DOMAINDIR
261 (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
262 #endif /* TEXTDOMAINDIR */
263 (void) textdomain(TZ_DOMAIN);
264 #endif /* HAVE_GETTEXT */
265 for (i = 1; i < argc; ++i)
266 if (strcmp(argv[i], "--version") == 0) {
267 errx(EXIT_SUCCESS, "%s", elsieid);
268 } else if (strcmp(argv[i], "--help") == 0) {
269 usage(stdout, EXIT_SUCCESS);
270 }
271 vflag = 0;
272 cutarg = NULL;
273 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
274 if (c == 'v')
275 vflag = 1;
276 else cutarg = optarg;
277 if ((c != -1) ||
278 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
279 usage(stderr, EXIT_FAILURE);
280 }
281 if (vflag) {
282 if (cutarg != NULL) {
283 long lo;
284 long hi;
285 char dummy;
286
287 if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
288 cuthiyear = hi;
289 } else if (sscanf(cutarg, "%ld,%ld%c",
290 &lo, &hi, &dummy) == 2) {
291 cutloyear = lo;
292 cuthiyear = hi;
293 } else {
294 (void) fprintf(stderr, _("%s: wild -c argument %s\n"),
295 progname, cutarg);
296 exit(EXIT_FAILURE);
297 }
298 }
299 setabsolutes();
300 cutlotime = yeartot(cutloyear);
301 cuthitime = yeartot(cuthiyear);
302 }
303 (void) time(&now);
304 longest = 0;
305 for (i = optind; i < argc; ++i)
306 if (strlen(argv[i]) > longest)
307 longest = strlen(argv[i]);
308 {
309 register int from;
310 register int to;
311
312 for (i = 0; environ[i] != NULL; ++i)
313 continue;
314 fakeenv = (char **) malloc((size_t) ((i + 2) *
315 sizeof *fakeenv));
316 if (fakeenv == NULL ||
317 (fakeenv[0] = (char *) malloc((size_t) (longest +
318 4))) == NULL)
319 errx(EXIT_FAILURE,
320 _("malloc() failed"));
321 to = 0;
322 (void) strcpy(fakeenv[to++], "TZ=");
323 for (from = 0; environ[from] != NULL; ++from)
324 if (strncmp(environ[from], "TZ=", 3) != 0)
325 fakeenv[to++] = environ[from];
326 fakeenv[to] = NULL;
327 environ = fakeenv;
328 }
329 for (i = optind; i < argc; ++i) {
330 static char buf[MAX_STRING_LENGTH];
331
332 (void) strcpy(&fakeenv[0][3], argv[i]);
333 if (!vflag) {
334 show(argv[i], now, FALSE);
335 continue;
336 }
337 warned = FALSE;
338 t = absolute_min_time;
339 show(argv[i], t, TRUE);
340 t += SECSPERHOUR * HOURSPERDAY;
341 show(argv[i], t, TRUE);
342 if (t < cutlotime)
343 t = cutlotime;
344 tmp = my_localtime(&t);
345 if (tmp != NULL) {
346 tm = *tmp;
347 (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
348 }
349 for ( ; ; ) {
350 if (t >= cuthitime || t >= cuthitime - SECSPERHOUR * 12)
351 break;
352 newt = t + SECSPERHOUR * 12;
353 newtmp = localtime(&newt);
354 if (newtmp != NULL)
355 newtm = *newtmp;
356 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
357 (delta(&newtm, &tm) != (newt - t) ||
358 newtm.tm_isdst != tm.tm_isdst ||
359 strcmp(abbr(&newtm), buf) != 0)) {
360 newt = hunt(argv[i], t, newt);
361 newtmp = localtime(&newt);
362 if (newtmp != NULL) {
363 newtm = *newtmp;
364 (void) strncpy(buf,
365 abbr(&newtm),
366 (sizeof buf) - 1);
367 }
368 }
369 t = newt;
370 tm = newtm;
371 tmp = newtmp;
372 }
373 t = absolute_max_time;
374 t -= SECSPERHOUR * HOURSPERDAY;
375 show(argv[i], t, TRUE);
376 t += SECSPERHOUR * HOURSPERDAY;
377 show(argv[i], t, TRUE);
378 }
379 if (fflush(stdout) || ferror(stdout))
380 errx(EXIT_FAILURE, _("error writing standard output"));
381 exit(EXIT_SUCCESS);
382 /* If exit fails to exit... */
383 return(EXIT_FAILURE);
384 }
385
386 static void
setabsolutes(void)387 setabsolutes(void)
388 {
389 if (0.5 == (time_t) 0.5) {
390 /*
391 ** time_t is floating.
392 */
393 if (sizeof (time_t) == sizeof (float)) {
394 absolute_min_time = (time_t) -FLT_MAX;
395 absolute_max_time = (time_t) FLT_MAX;
396 } else if (sizeof (time_t) == sizeof (double)) {
397 absolute_min_time = (time_t) -DBL_MAX;
398 absolute_max_time = (time_t) DBL_MAX;
399 } else {
400 (void) fprintf(stderr,
401 _("%s: use of -v on system with floating time_t other than float or double\n"),
402 progname);
403 exit(EXIT_FAILURE);
404 }
405 } else if (0 > (time_t) -1) {
406 /*
407 ** time_t is signed. Assume overflow wraps around.
408 */
409 time_t t = 0;
410 time_t t1 = 1;
411
412 while (t < t1) {
413 t = t1;
414 t1 = 2 * t1 + 1;
415 }
416
417 absolute_max_time = t;
418 t = -t;
419 absolute_min_time = t - 1;
420 if (t < absolute_min_time)
421 absolute_min_time = t;
422 } else {
423 /*
424 ** time_t is unsigned.
425 */
426 absolute_min_time = 0;
427 absolute_max_time = absolute_min_time - 1;
428 }
429 }
430
431 static time_t
yeartot(y)432 yeartot(y)
433 const long y;
434 {
435 register long myy;
436 register long seconds;
437 register time_t t;
438
439 myy = EPOCH_YEAR;
440 t = 0;
441 while (myy != y) {
442 if (myy < y) {
443 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
444 ++myy;
445 if (t > absolute_max_time - seconds) {
446 t = absolute_max_time;
447 break;
448 }
449 t += seconds;
450 } else {
451 --myy;
452 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
453 if (t < absolute_min_time + seconds) {
454 t = absolute_min_time;
455 break;
456 }
457 t -= seconds;
458 }
459 }
460 return t;
461 }
462
463 static void
usage(FILE * stream,int status)464 usage(FILE *stream, int status)
465 {
466 fprintf(stream,
467 _("usage: %s [--version] [-v] [--help] [-c [loyear,]hiyear] zonename ...\n\
468 \n\
469 Report bugs to [email protected].\n"), progname);
470 exit(status);
471 }
472
473 static time_t
hunt(char * name,time_t lot,time_t hit)474 hunt(char *name, time_t lot, time_t hit)
475 {
476 time_t t;
477 long diff;
478 struct tm lotm;
479 register struct tm * lotmp;
480 struct tm tm;
481 register struct tm * tmp;
482 char loab[MAX_STRING_LENGTH];
483
484 lotmp = my_localtime(&lot);
485 if (lotmp != NULL) {
486 lotm = *lotmp;
487 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
488 }
489 for ( ; ; ) {
490 diff = (long) (hit - lot);
491 if (diff < 2)
492 break;
493 t = lot;
494 t += diff / 2;
495 if (t <= lot)
496 ++t;
497 else if (t >= hit)
498 --t;
499 tmp = my_localtime(&t);
500 if (tmp != NULL)
501 tm = *tmp;
502 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
503 (delta(&tm, &lotm) == (t - lot) &&
504 tm.tm_isdst == lotm.tm_isdst &&
505 strcmp(abbr(&tm), loab) == 0)) {
506 lot = t;
507 lotm = tm;
508 lotmp = tmp;
509 } else hit = t;
510 }
511 show(name, lot, TRUE);
512 show(name, hit, TRUE);
513 return hit;
514 }
515
516 /*
517 ** Thanks to Paul Eggert for logic used in delta.
518 */
519
520 static long
delta(newp,oldp)521 delta(newp, oldp)
522 struct tm * newp;
523 struct tm * oldp;
524 {
525 register long result;
526 register int tmy;
527
528 if (newp->tm_year < oldp->tm_year)
529 return -delta(oldp, newp);
530 result = 0;
531 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
532 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
533 result += newp->tm_yday - oldp->tm_yday;
534 result *= HOURSPERDAY;
535 result += newp->tm_hour - oldp->tm_hour;
536 result *= MINSPERHOUR;
537 result += newp->tm_min - oldp->tm_min;
538 result *= SECSPERMIN;
539 result += newp->tm_sec - oldp->tm_sec;
540 return result;
541 }
542
543 static void
show(char * zone,time_t t,int v)544 show(char *zone, time_t t, int v)
545 {
546 register struct tm * tmp;
547
548 (void) printf("%-*s ", (int) longest, zone);
549 if (v) {
550 tmp = gmtime(&t);
551 if (tmp == NULL) {
552 (void) printf(tformat(), t);
553 } else {
554 dumptime(tmp);
555 (void) printf(" UTC");
556 }
557 (void) printf(" = ");
558 }
559 tmp = my_localtime(&t);
560 dumptime(tmp);
561 if (tmp != NULL) {
562 if (*abbr(tmp) != '\0')
563 (void) printf(" %s", abbr(tmp));
564 if (v) {
565 (void) printf(" isdst=%d", tmp->tm_isdst);
566 #ifdef TM_GMTOFF
567 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
568 #endif /* defined TM_GMTOFF */
569 }
570 }
571 (void) printf("\n");
572 if (tmp != NULL && *abbr(tmp) != '\0')
573 abbrok(abbr(tmp), zone);
574 }
575
576 static char *
abbr(tmp)577 abbr(tmp)
578 struct tm * tmp;
579 {
580 register char * result;
581 static char nada;
582
583 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
584 return &nada;
585 result = tzname[tmp->tm_isdst];
586 return (result == NULL) ? &nada : result;
587 }
588
589 /*
590 ** The code below can fail on certain theoretical systems;
591 ** it works on all known real-world systems as of 2004-12-30.
592 */
593
594 static const char *
tformat(void)595 tformat(void)
596 {
597 if (0.5 == (time_t) 0.5) { /* floating */
598 if (sizeof (time_t) > sizeof (double))
599 return "%Lg";
600 return "%g";
601 }
602 if (0 > (time_t) -1) { /* signed */
603 if (sizeof (time_t) > sizeof (long))
604 return "%lld";
605 if (sizeof (time_t) > sizeof (int))
606 return "%ld";
607 return "%d";
608 }
609 if (sizeof (time_t) > sizeof (unsigned long))
610 return "%llu";
611 if (sizeof (time_t) > sizeof (unsigned int))
612 return "%lu";
613 return "%u";
614 }
615
616 static void
dumptime(timeptr)617 dumptime(timeptr)
618 register const struct tm * timeptr;
619 {
620 static const char wday_name[][3] = {
621 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
622 };
623 static const char mon_name[][3] = {
624 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
625 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
626 };
627 register const char * wn;
628 register const char * mn;
629 register int lead;
630 register int trail;
631
632 if (timeptr == NULL) {
633 (void) printf("NULL");
634 return;
635 }
636 /*
637 ** The packaged versions of localtime and gmtime never put out-of-range
638 ** values in tm_wday or tm_mon, but since this code might be compiled
639 ** with other (perhaps experimental) versions, paranoia is in order.
640 */
641 if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
642 (int) (sizeof wday_name / sizeof wday_name[0]))
643 wn = "???";
644 else wn = wday_name[timeptr->tm_wday];
645 if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
646 (int) (sizeof mon_name / sizeof mon_name[0]))
647 mn = "???";
648 else mn = mon_name[timeptr->tm_mon];
649 (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
650 wn, mn,
651 timeptr->tm_mday, timeptr->tm_hour,
652 timeptr->tm_min, timeptr->tm_sec);
653 #define DIVISOR 10
654 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
655 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
656 trail / DIVISOR;
657 trail %= DIVISOR;
658 if (trail < 0 && lead > 0) {
659 trail += DIVISOR;
660 --lead;
661 } else if (lead < 0 && trail > 0) {
662 trail -= DIVISOR;
663 ++lead;
664 }
665 if (lead == 0)
666 (void) printf("%d", trail);
667 else (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
668 }
669