1 /*
2 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /*
7 * Copyright (c) 2018, Joyent, Inc.
8 */
9
10 /*
11 * zdump 7.24
12 * Taken from elsie.nci.nih.gov to replace the existing Solaris zdump,
13 * which was based on an earlier version of the elsie code.
14 *
15 * For zdump 7.24, the following changes were made to the elsie code:
16 * locale/textdomain/messages to match existing Solaris style.
17 * Solaris verbose mode is documented to display the current time first.
18 * cstyle cleaned code.
19 * removed old locale/textdomain code.
20 */
21
22 static char elsieid[] = "@(#)zdump.c 7.74";
23
24 /*
25 * This code has been made independent of the rest of the time
26 * conversion package to increase confidence in the verification it provides.
27 * You can use this code to help in verifying other implementations.
28 */
29
30 #include "stdio.h" /* for stdout, stderr, perror */
31 #include "string.h" /* for strcpy */
32 #include "sys/types.h" /* for time_t */
33 #include "time.h" /* for struct tm */
34 #include "stdlib.h" /* for exit, malloc, atoi */
35 #include "locale.h" /* for setlocale, textdomain */
36 #include "libintl.h"
37 #include <ctype.h>
38 #include "tzfile.h" /* for defines */
39 #include <limits.h>
40
41 #ifndef ZDUMP_LO_YEAR
42 #define ZDUMP_LO_YEAR (-500)
43 #endif /* !defined ZDUMP_LO_YEAR */
44
45 #ifndef ZDUMP_HI_YEAR
46 #define ZDUMP_HI_YEAR 2500
47 #endif /* !defined ZDUMP_HI_YEAR */
48
49 #ifndef MAX_STRING_LENGTH
50 #define MAX_STRING_LENGTH 1024
51 #endif /* !defined MAX_STRING_LENGTH */
52
53 #ifndef TRUE
54 #define TRUE 1
55 #endif /* !defined TRUE */
56
57 #ifndef FALSE
58 #define FALSE 0
59 #endif /* !defined FALSE */
60
61 #ifndef isleap_sum
62 /*
63 * See tzfile.h for details on isleap_sum.
64 */
65 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
66 #endif /* !defined isleap_sum */
67
68 #ifndef SECSPERDAY
69 #define SECSPERDAY ((long)SECSPERHOUR * HOURSPERDAY)
70 #endif
71 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
72 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
73
74 #ifndef GNUC_or_lint
75 #ifdef lint
76 #define GNUC_or_lint
77 #else /* !defined lint */
78 #ifdef __GNUC__
79 #define GNUC_or_lint
80 #endif /* defined __GNUC__ */
81 #endif /* !defined lint */
82 #endif /* !defined GNUC_or_lint */
83
84 #ifndef INITIALIZE
85 #ifdef GNUC_or_lint
86 #define INITIALIZE(x) ((x) = 0)
87 #else /* !defined GNUC_or_lint */
88 #define INITIALIZE(x)
89 #endif /* !defined GNUC_or_lint */
90 #endif /* !defined INITIALIZE */
91
92 static time_t absolute_min_time;
93 static time_t absolute_max_time;
94 static size_t longest;
95 static char *progname;
96 static int warned;
97
98 static char *abbr(struct tm *);
99 static void abbrok(const char *, const char *);
100 static long delta(struct tm *, struct tm *);
101 static void dumptime(const struct tm *);
102 static time_t hunt(char *, time_t, time_t);
103 static void setabsolutes(void);
104 static void show(char *, time_t, int);
105 static void usage(void);
106 static const char *tformat(void);
107 static time_t yeartot(long y);
108
109 #ifndef TYPECHECK
110 #define my_localtime localtime
111 #else /* !defined TYPECHECK */
112 static struct tm *
113 my_localtime(tp)
114 time_t *tp;
115 {
116 register struct tm *tmp;
117
118 tmp = localtime(tp);
119 if (tp != NULL && tmp != NULL) {
120 struct tm tm;
121 register time_t t;
122
123 tm = *tmp;
124 t = mktime(&tm);
125 if (t - *tp >= 1 || *tp - t >= 1) {
126 (void) fflush(stdout);
127 (void) fprintf(stderr, "\n%s: ", progname);
128 (void) fprintf(stderr, tformat(), *tp);
129 (void) fprintf(stderr, " ->");
130 (void) fprintf(stderr, " year=%d", tmp->tm_year);
131 (void) fprintf(stderr, " mon=%d", tmp->tm_mon);
132 (void) fprintf(stderr, " mday=%d", tmp->tm_mday);
133 (void) fprintf(stderr, " hour=%d", tmp->tm_hour);
134 (void) fprintf(stderr, " min=%d", tmp->tm_min);
135 (void) fprintf(stderr, " sec=%d", tmp->tm_sec);
136 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
137 (void) fprintf(stderr, " -> ");
138 (void) fprintf(stderr, tformat(), t);
139 (void) fprintf(stderr, "\n");
140 }
141 }
142 return (tmp);
143 }
144 #endif /* !defined TYPECHECK */
145
146 static void
147 abbrok(const char * const abbrp, const char * const zone)
148 {
149 register const char *cp;
150 int error = 0;
151
152 if (warned)
153 return;
154 cp = abbrp;
155 while (isalpha(*cp) || isdigit(*cp) || *cp == '-' || *cp == '+')
156 ++cp;
157 (void) fflush(stdout);
158 if (cp - abbrp < 3) {
159 (void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
160 "abbreviation \"%s\" has fewer than 3 alphabetics\n"),
161 progname, zone, abbrp);
162 error = 1;
163 } else if (cp - abbrp > 6) {
164 (void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
165 "abbreviation \"%s\" has more than 6 characters\n"),
166 progname, zone, abbrp);
167 error = 1;
168 } else if (*cp != '\0') {
169 (void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
170 "abbreviation \"%s\" has characters other than "
171 "alphanumerics\n"), progname, zone, abbrp);
172 error = 1;
173 }
174 if (error)
175 warned = TRUE;
176 }
177
178 int
179 main(argc, argv)
180 int argc;
181 char *argv[];
182 {
183 register int i;
184 register int c;
185 register int vflag;
186 register char *cutarg;
187 register long cutloyear = ZDUMP_LO_YEAR;
188 register long cuthiyear = ZDUMP_HI_YEAR;
189 register time_t cutlotime;
190 register time_t cuthitime;
191 time_t now;
192 time_t t;
193 time_t newt;
194 struct tm tm;
195 struct tm newtm;
196 register struct tm *tmp;
197 register struct tm *newtmp;
198
199 INITIALIZE(cutlotime);
200 INITIALIZE(cuthitime);
201
202 (void) setlocale(LC_ALL, "");
203 #if !defined(TEXT_DOMAIN) /* Should be defined by cc -D */
204 #define TEXT_DOMAIN "SYS_TEST" /* Use this only if it weren't */
205 #endif
206 (void) textdomain(TEXT_DOMAIN);
207
208 progname = argv[0];
209 for (i = 1; i < argc; ++i)
210 if (strcmp(argv[i], "--version") == 0) {
211 (void) printf("%s\n", elsieid);
212 exit(EXIT_SUCCESS);
213 }
214 vflag = 0;
215 cutarg = NULL;
216 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
217 if (c == 'v')
218 vflag = 1;
219 else cutarg = optarg;
220 if (c != EOF ||
221 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
222 usage();
223 /* NOTREACHED */
224 }
225 if (vflag) {
226 if (cutarg != NULL) {
227 long lo;
228 long hi;
229 char dummy;
230
231 if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
232 cuthiyear = hi;
233 } else if (sscanf(cutarg, "%ld,%ld%c",
234 &lo, &hi, &dummy) == 2) {
235 cutloyear = lo;
236 cuthiyear = hi;
237 } else {
238 (void) fprintf(stderr,
239 gettext("%s: wild -c argument %s\n"),
240 progname, cutarg);
241 exit(EXIT_FAILURE);
242 }
243 }
244 setabsolutes();
245 cutlotime = yeartot(cutloyear);
246 cuthitime = yeartot(cuthiyear);
247 }
248 (void) time(&now);
249 longest = 0;
250 for (i = optind; i < argc; ++i)
251 if (strlen(argv[i]) > longest)
252 longest = strlen(argv[i]);
253
254 for (i = optind; i < argc; ++i) {
255 static char buf[MAX_STRING_LENGTH];
256 static char *tzp = NULL;
257
258 (void) unsetenv("TZ");
259 if (tzp != NULL)
260 free(tzp);
261 if ((tzp = malloc(3 + strlen(argv[i]) + 1)) == NULL) {
262 perror(progname);
263 exit(EXIT_FAILURE);
264 }
265 (void) strcpy(tzp, "TZ=");
266 (void) strcat(tzp, argv[i]);
267 if (putenv(tzp) != 0) {
268 perror(progname);
269 exit(EXIT_FAILURE);
270 }
271 if (!vflag) {
272 show(argv[i], now, FALSE);
273 continue;
274 }
275
276 #if defined(sun)
277 /*
278 * We show the current time first, probably because we froze
279 * the behavior of zdump some time ago and then it got
280 * changed.
281 */
282 show(argv[i], now, TRUE);
283 #endif
284 warned = FALSE;
285 t = absolute_min_time;
286 show(argv[i], t, TRUE);
287 t += SECSPERHOUR * HOURSPERDAY;
288 show(argv[i], t, TRUE);
289 if (t < cutlotime)
290 t = cutlotime;
291 tmp = my_localtime(&t);
292 if (tmp != NULL) {
293 tm = *tmp;
294 (void) strncpy(buf, abbr(&tm), sizeof (buf) - 1);
295 }
296 for (;;) {
297 if (t >= cuthitime)
298 break;
299 /* check if newt will overrun maximum time_t value */
300 if (t > LONG_MAX - (SECSPERHOUR * 12))
301 break;
302 newt = t + SECSPERHOUR * 12;
303 if (newt >= cuthitime)
304 break;
305 newtmp = localtime(&newt);
306 if (newtmp != NULL)
307 newtm = *newtmp;
308 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
309 (delta(&newtm, &tm) != (newt - t) ||
310 newtm.tm_isdst != tm.tm_isdst ||
311 strcmp(abbr(&newtm), buf) != 0)) {
312 newt = hunt(argv[i], t, newt);
313 newtmp = localtime(&newt);
314 if (newtmp != NULL) {
315 newtm = *newtmp;
316 (void) strncpy(buf,
317 abbr(&newtm),
318 sizeof (buf) - 1);
319 }
320 }
321 t = newt;
322 tm = newtm;
323 tmp = newtmp;
324 }
325 t = absolute_max_time;
326 #if defined(sun)
327 show(argv[i], t, TRUE);
328 t -= SECSPERHOUR * HOURSPERDAY;
329 show(argv[i], t, TRUE);
330 #else /* !defined(sun) */
331 t -= SECSPERHOUR * HOURSPERDAY;
332 show(argv[i], t, TRUE);
333 t += SECSPERHOUR * HOURSPERDAY;
334 show(argv[i], t, TRUE);
335 #endif /* !defined(sun) */
336 }
337 if (fflush(stdout) || ferror(stdout)) {
338 (void) fprintf(stderr, "%s: ", progname);
339 (void) perror(gettext("Error writing standard output"));
340 exit(EXIT_FAILURE);
341 }
342 return (EXIT_SUCCESS);
343 }
344
345 static void
346 setabsolutes()
347 {
348 #if defined(sun)
349 absolute_min_time = LONG_MIN;
350 absolute_max_time = LONG_MAX;
351 #else
352 if (0.5 == (time_t)0.5) {
353 /*
354 * time_t is floating.
355 */
356 if (sizeof (time_t) == sizeof (float)) {
357 absolute_min_time = (time_t)-FLT_MAX;
358 absolute_max_time = (time_t)FLT_MAX;
359 } else if (sizeof (time_t) == sizeof (double)) {
360 absolute_min_time = (time_t)-DBL_MAX;
361 absolute_max_time = (time_t)DBL_MAX;
362 } else {
363 (void) fprintf(stderr, gettext("%s: use of -v on "
364 "system with floating time_t other than float "
365 "or double\n"), progname);
366 exit(EXIT_FAILURE);
367 }
368 } else
369 /*CONSTANTCONDITION*/
370 if (0 > (time_t)-1) {
371 /*
372 * time_t is signed.
373 */
374 register time_t hibit;
375
376 for (hibit = 1; (hibit * 2) != 0; hibit *= 2)
377 continue;
378 absolute_min_time = hibit;
379 absolute_max_time = -(hibit + 1);
380 } else {
381 /*
382 * time_t is unsigned.
383 */
384 absolute_min_time = 0;
385 absolute_max_time = absolute_min_time - 1;
386 }
387 #endif
388 }
389
390 static time_t
391 yeartot(y)
392 const long y;
393 {
394 register long myy;
395 register long seconds;
396 register time_t t;
397
398 myy = EPOCH_YEAR;
399 t = 0;
400 while (myy != y) {
401 if (myy < y) {
402 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
403 ++myy;
404 if (t > absolute_max_time - seconds) {
405 t = absolute_max_time;
406 break;
407 }
408 t += seconds;
409 } else {
410 --myy;
411 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
412 if (t < absolute_min_time + seconds) {
413 t = absolute_min_time;
414 break;
415 }
416 t -= seconds;
417 }
418 }
419 return (t);
420 }
421
422 static time_t
423 hunt(name, lot, hit)
424 char *name;
425 time_t lot;
426 time_t hit;
427 {
428 time_t t;
429 long diff;
430 struct tm lotm;
431 register struct tm *lotmp;
432 struct tm tm;
433 register struct tm *tmp;
434 char loab[MAX_STRING_LENGTH];
435
436 lotmp = my_localtime(&lot);
437 if (lotmp != NULL) {
438 lotm = *lotmp;
439 (void) strncpy(loab, abbr(&lotm), sizeof (loab) - 1);
440 }
441 for (;;) {
442 diff = (long)(hit - lot);
443 if (diff < 2)
444 break;
445 t = lot;
446 t += diff / 2;
447 if (t <= lot)
448 ++t;
449 else if (t >= hit)
450 --t;
451 tmp = my_localtime(&t);
452 if (tmp != NULL)
453 tm = *tmp;
454 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
455 (delta(&tm, &lotm) == (t - lot) &&
456 tm.tm_isdst == lotm.tm_isdst &&
457 strcmp(abbr(&tm), loab) == 0)) {
458 lot = t;
459 lotm = tm;
460 lotmp = tmp;
461 } else hit = t;
462 }
463 show(name, lot, TRUE);
464 show(name, hit, TRUE);
465 return (hit);
466 }
467
468 /*
469 * Thanks to Paul Eggert for logic used in delta.
470 */
471
472 static long
473 delta(newp, oldp)
474 struct tm *newp;
475 struct tm *oldp;
476 {
477 register long result;
478 register int tmy;
479
480 if (newp->tm_year < oldp->tm_year)
481 return (-delta(oldp, newp));
482 result = 0;
483 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
484 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
485 result += newp->tm_yday - oldp->tm_yday;
486 result *= HOURSPERDAY;
487 result += newp->tm_hour - oldp->tm_hour;
488 result *= MINSPERHOUR;
489 result += newp->tm_min - oldp->tm_min;
490 result *= SECSPERMIN;
491 result += newp->tm_sec - oldp->tm_sec;
492 return (result);
493 }
494
495 static void
496 show(zone, t, v)
497 char *zone;
498 time_t t;
499 int v;
500 {
501 register struct tm *tmp;
502
503 (void) printf("%-*s ", (int)longest, zone);
504 if (v) {
505 tmp = gmtime(&t);
506 if (tmp == NULL) {
507 (void) printf(tformat(), t);
508 } else {
509 dumptime(tmp);
510 (void) printf(" UTC");
511 }
512 (void) printf(" = ");
513 }
514 tmp = my_localtime(&t);
515 dumptime(tmp);
516 if (tmp != NULL) {
517 if (*abbr(tmp) != '\0')
518 (void) printf(" %s", abbr(tmp));
519 if (v) {
520 (void) printf(" isdst=%d", tmp->tm_isdst);
521 #ifdef TM_GMTOFF
522 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
523 #endif /* defined TM_GMTOFF */
524 }
525 }
526 (void) printf("\n");
527 if (tmp != NULL && *abbr(tmp) != '\0')
528 abbrok(abbr(tmp), zone);
529 }
530
531 static char *
532 abbr(tmp)
533 struct tm *tmp;
534 {
535 register char *result;
536 static char nada;
537
538 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
539 return (&nada);
540 result = tzname[tmp->tm_isdst];
541 return ((result == NULL) ? &nada : result);
542 }
543
544 /*
545 * The code below can fail on certain theoretical systems;
546 * it works on all known real-world systems as of 2004-12-30.
547 */
548
549 static const char *
550 tformat()
551 {
552 #if defined(sun)
553 /* time_t is signed long */
554 return ("%ld");
555 #else
556 /*CONSTANTCONDITION*/
557 if (0.5 == (time_t)0.5) { /* floating */
558 /*CONSTANTCONDITION*/
559 if (sizeof (time_t) > sizeof (double))
560 return ("%Lg");
561 return ("%g");
562 }
563 /*CONSTANTCONDITION*/
564 if (0 > (time_t)-1) { /* signed */
565 /*CONSTANTCONDITION*/
566 if (sizeof (time_t) > sizeof (long))
567 return ("%lld");
568 /*CONSTANTCONDITION*/
569 if (sizeof (time_t) > sizeof (int))
570 return ("%ld");
571 return ("%d");
572 }
573 /*CONSTANTCONDITION*/
574 if (sizeof (time_t) > sizeof (unsigned long))
575 return ("%llu");
576 /*CONSTANTCONDITION*/
577 if (sizeof (time_t) > sizeof (unsigned int))
578 return ("%lu");
579 return ("%u");
580 #endif
581 }
582
583 static void
584 dumptime(timeptr)
585 register const struct tm *timeptr;
586 {
587 static const char wday_name[][3] = {
588 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
589 };
590 static const char mon_name[][3] = {
591 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
592 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
593 };
594 register const char *wn;
595 register const char *mn;
596 register int lead;
597 register int trail;
598
599 if (timeptr == NULL) {
600 (void) printf("NULL");
601 return;
602 }
603 /*
604 * The packaged versions of localtime and gmtime never put out-of-range
605 * values in tm_wday or tm_mon, but since this code might be compiled
606 * with other (perhaps experimental) versions, paranoia is in order.
607 */
608 if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
609 (int)(sizeof (wday_name) / sizeof (wday_name[0])))
610 wn = "???";
611 else wn = wday_name[timeptr->tm_wday];
612 if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
613 (int)(sizeof (mon_name) / sizeof (mon_name[0])))
614 mn = "???";
615 else mn = mon_name[timeptr->tm_mon];
616 (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
617 wn, mn,
618 timeptr->tm_mday, timeptr->tm_hour,
619 timeptr->tm_min, timeptr->tm_sec);
620 #define DIVISOR 10
621 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
622 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
623 trail / DIVISOR;
624 trail %= DIVISOR;
625 if (trail < 0 && lead > 0) {
626 trail += DIVISOR;
627 --lead;
628 } else if (lead < 0 && trail > 0) {
629 trail -= DIVISOR;
630 ++lead;
631 }
632 if (lead == 0)
633 (void) printf("%d", trail);
634 else
635 (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
636 }
637
638 static void
639 usage()
640 {
641 (void) fprintf(stderr, gettext(
642 "%s: [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
643 progname);
644 exit(EXIT_FAILURE);
645 /* NOTREACHED */
646 }