1 /*
2 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 #pragma ident "%Z%%M% %I% %E% SMI"
7
8 /*
9 * zdump 7.24
10 * Taken from elsie.nci.nih.gov to replace the existing Solaris zdump,
11 * which was based on an earlier version of the elsie code.
12 *
13 * For zdump 7.24, the following changes were made to the elsie code:
14 * locale/textdomain/messages to match existing Solaris style.
15 * Solaris verbose mode is documented to display the current time first.
16 * cstyle cleaned code.
17 * removed old locale/textdomain code.
18 */
19
20 static char elsieid[] = "@(#)zdump.c 7.74";
21
22 /*
23 * This code has been made independent of the rest of the time
24 * conversion package to increase confidence in the verification it provides.
25 * You can use this code to help in verifying other implementations.
26 */
27
28 #include "stdio.h" /* for stdout, stderr, perror */
29 #include "string.h" /* for strcpy */
30 #include "sys/types.h" /* for time_t */
31 #include "time.h" /* for struct tm */
32 #include "stdlib.h" /* for exit, malloc, atoi */
33 #include "locale.h" /* for setlocale, textdomain */
34 #include "libintl.h"
35 #include <ctype.h>
36 #include "tzfile.h" /* for defines */
37 #include <limits.h>
38
39 #ifndef ZDUMP_LO_YEAR
40 #define ZDUMP_LO_YEAR (-500)
41 #endif /* !defined ZDUMP_LO_YEAR */
42
43 #ifndef ZDUMP_HI_YEAR
44 #define ZDUMP_HI_YEAR 2500
45 #endif /* !defined ZDUMP_HI_YEAR */
46
47 #ifndef MAX_STRING_LENGTH
48 #define MAX_STRING_LENGTH 1024
49 #endif /* !defined MAX_STRING_LENGTH */
50
51 #ifndef TRUE
52 #define TRUE 1
53 #endif /* !defined TRUE */
54
55 #ifndef FALSE
56 #define FALSE 0
57 #endif /* !defined FALSE */
58
59 #ifndef isleap_sum
60 /*
61 * See tzfile.h for details on isleap_sum.
62 */
63 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
64 #endif /* !defined isleap_sum */
65
66 #ifndef SECSPERDAY
67 #define SECSPERDAY ((long)SECSPERHOUR * HOURSPERDAY)
68 #endif
69 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
70 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
71
72 #ifndef GNUC_or_lint
73 #ifdef lint
74 #define GNUC_or_lint
75 #else /* !defined lint */
76 #ifdef __GNUC__
77 #define GNUC_or_lint
78 #endif /* defined __GNUC__ */
79 #endif /* !defined lint */
80 #endif /* !defined GNUC_or_lint */
81
82 #ifndef INITIALIZE
83 #ifdef GNUC_or_lint
84 #define INITIALIZE(x) ((x) = 0)
85 #else /* !defined GNUC_or_lint */
86 #define INITIALIZE(x)
87 #endif /* !defined GNUC_or_lint */
88 #endif /* !defined INITIALIZE */
89
90 static time_t absolute_min_time;
91 static time_t absolute_max_time;
92 static size_t longest;
93 static char *progname;
94 static int warned;
95
96 static char *abbr(struct tm *);
97 static void abbrok(const char *, const char *);
98 static long delta(struct tm *, struct tm *);
99 static void dumptime(const struct tm *);
100 static time_t hunt(char *, time_t, time_t);
101 static void setabsolutes(void);
102 static void show(char *, time_t, int);
103 static void usage(void);
104 static const char *tformat(void);
105 static time_t yeartot(long y);
106
107 #ifndef TYPECHECK
108 #define my_localtime localtime
109 #else /* !defined TYPECHECK */
110 static struct tm *
111 my_localtime(tp)
112 time_t *tp;
113 {
114 register struct tm *tmp;
115
116 tmp = localtime(tp);
117 if (tp != NULL && tmp != NULL) {
118 struct tm tm;
119 register time_t t;
120
121 tm = *tmp;
122 t = mktime(&tm);
123 if (t - *tp >= 1 || *tp - t >= 1) {
124 (void) fflush(stdout);
125 (void) fprintf(stderr, "\n%s: ", progname);
126 (void) fprintf(stderr, tformat(), *tp);
127 (void) fprintf(stderr, " ->");
128 (void) fprintf(stderr, " year=%d", tmp->tm_year);
129 (void) fprintf(stderr, " mon=%d", tmp->tm_mon);
130 (void) fprintf(stderr, " mday=%d", tmp->tm_mday);
131 (void) fprintf(stderr, " hour=%d", tmp->tm_hour);
132 (void) fprintf(stderr, " min=%d", tmp->tm_min);
133 (void) fprintf(stderr, " sec=%d", tmp->tm_sec);
134 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
135 (void) fprintf(stderr, " -> ");
136 (void) fprintf(stderr, tformat(), t);
137 (void) fprintf(stderr, "\n");
138 }
139 }
140 return (tmp);
141 }
142 #endif /* !defined TYPECHECK */
143
144 static void
145 abbrok(abbrp, zone)
146 const char * const abbrp;
147 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 (isascii(*cp) && isalpha((unsigned char)*cp))
156 ++cp;
157 (void) fflush(stdout);
158 if (cp - abbrp == 0) {
159 /*
160 * TRANSLATION_NOTE
161 * The first %s prints for the program name (zdump),
162 * the second %s prints the timezone name, the third
163 * %s prints the timezone abbreviation (tzname[0] or
164 * tzname[1]).
165 */
166 (void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
167 "abbreviation \"%s\" lacks alphabetic at start\n"),
168 progname, zone, abbrp);
169 error = 1;
170 } else if (cp - abbrp < 3) {
171 (void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
172 "abbreviation \"%s\" has fewer than 3 alphabetics\n"),
173 progname, zone, abbrp);
174 error = 1;
175 } else if (cp - abbrp > 6) {
176 (void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
177 "abbreviation \"%s\" has more than 6 alphabetics\n"),
178 progname, zone, abbrp);
179 error = 1;
180 }
181 if (error == 0 && (*cp == '+' || *cp == '-')) {
182 ++cp;
183 if (isascii(*cp) && isdigit((unsigned char)*cp))
184 if (*cp++ == '1' && *cp >= '0' && *cp <= '4')
185 ++cp;
186 if (*cp != '\0') {
187 (void) fprintf(stderr, gettext("%s: warning: "
188 "zone \"%s\" abbreviation \"%s\" differs from "
189 "POSIX standard\n"), progname, zone, abbrp);
190 error = 1;
191 }
192 }
193 if (error)
194 warned = TRUE;
195 }
196
197 int
198 main(argc, argv)
199 int argc;
200 char *argv[];
201 {
202 register int i;
203 register int c;
204 register int vflag;
205 register char *cutarg;
206 register long cutloyear = ZDUMP_LO_YEAR;
207 register long cuthiyear = ZDUMP_HI_YEAR;
208 register time_t cutlotime;
209 register time_t cuthitime;
210 time_t now;
211 time_t t;
212 time_t newt;
213 struct tm tm;
214 struct tm newtm;
215 register struct tm *tmp;
216 register struct tm *newtmp;
217
218 INITIALIZE(cutlotime);
219 INITIALIZE(cuthitime);
220
221 (void) setlocale(LC_ALL, "");
222 #if !defined(TEXT_DOMAIN) /* Should be defined by cc -D */
223 #define TEXT_DOMAIN "SYS_TEST" /* Use this only if it weren't */
224 #endif
225 (void) textdomain(TEXT_DOMAIN);
226
227 progname = argv[0];
228 for (i = 1; i < argc; ++i)
229 if (strcmp(argv[i], "--version") == 0) {
230 (void) printf("%s\n", elsieid);
231 exit(EXIT_SUCCESS);
232 }
233 vflag = 0;
234 cutarg = NULL;
235 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
236 if (c == 'v')
237 vflag = 1;
238 else cutarg = optarg;
239 if (c != EOF ||
240 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
241 usage();
242 /* NOTREACHED */
243 }
244 if (vflag) {
245 if (cutarg != NULL) {
246 long lo;
247 long hi;
248 char dummy;
249
250 if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
251 cuthiyear = hi;
252 } else if (sscanf(cutarg, "%ld,%ld%c",
253 &lo, &hi, &dummy) == 2) {
254 cutloyear = lo;
255 cuthiyear = hi;
256 } else {
257 (void) fprintf(stderr, gettext("%s: wild -c argument %s\n"),
258 progname, cutarg);
259 exit(EXIT_FAILURE);
260 }
261 }
262 setabsolutes();
263 cutlotime = yeartot(cutloyear);
264 cuthitime = yeartot(cuthiyear);
265 }
266 (void) time(&now);
267 longest = 0;
268 for (i = optind; i < argc; ++i)
269 if (strlen(argv[i]) > longest)
270 longest = strlen(argv[i]);
271
272 for (i = optind; i < argc; ++i) {
273 static char buf[MAX_STRING_LENGTH];
274 static char *tzp = NULL;
275
276 (void) unsetenv("TZ");
277 if (tzp != NULL)
278 free(tzp);
279 if ((tzp = malloc(3 + strlen(argv[i]) + 1)) == NULL) {
280 perror(progname);
281 exit(EXIT_FAILURE);
282 }
283 (void) strcpy(tzp, "TZ=");
284 (void) strcat(tzp, argv[i]);
285 if (putenv(tzp) != 0) {
286 perror(progname);
287 exit(EXIT_FAILURE);
288 }
289 if (!vflag) {
290 show(argv[i], now, FALSE);
291 continue;
292 }
293
294 #if defined(sun)
295 /*
296 * We show the current time first, probably because we froze
297 * the behavior of zdump some time ago and then it got
298 * changed.
299 */
300 show(argv[i], now, TRUE);
301 #endif
302 warned = FALSE;
303 t = absolute_min_time;
304 show(argv[i], t, TRUE);
305 t += SECSPERHOUR * HOURSPERDAY;
306 show(argv[i], t, TRUE);
307 if (t < cutlotime)
308 t = cutlotime;
309 tmp = my_localtime(&t);
310 if (tmp != NULL) {
311 tm = *tmp;
312 (void) strncpy(buf, abbr(&tm), sizeof (buf) - 1);
313 }
314 for (;;) {
315 if (t >= cuthitime)
316 break;
317 /* check if newt will overrun maximum time_t value */
318 if (t > LONG_MAX - (SECSPERHOUR * 12))
319 break;
320 newt = t + SECSPERHOUR * 12;
321 if (newt >= cuthitime)
322 break;
323 newtmp = localtime(&newt);
324 if (newtmp != NULL)
325 newtm = *newtmp;
326 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
327 (delta(&newtm, &tm) != (newt - t) ||
328 newtm.tm_isdst != tm.tm_isdst ||
329 strcmp(abbr(&newtm), buf) != 0)) {
330 newt = hunt(argv[i], t, newt);
331 newtmp = localtime(&newt);
332 if (newtmp != NULL) {
333 newtm = *newtmp;
334 (void) strncpy(buf,
335 abbr(&newtm),
336 sizeof (buf) - 1);
337 }
338 }
339 t = newt;
340 tm = newtm;
341 tmp = newtmp;
342 }
343 t = absolute_max_time;
344 #if defined(sun)
345 show(argv[i], t, TRUE);
346 t -= SECSPERHOUR * HOURSPERDAY;
347 show(argv[i], t, TRUE);
348 #else /* !defined(sun) */
349 t -= SECSPERHOUR * HOURSPERDAY;
350 show(argv[i], t, TRUE);
351 t += SECSPERHOUR * HOURSPERDAY;
352 show(argv[i], t, TRUE);
353 #endif /* !defined(sun) */
354 }
355 if (fflush(stdout) || ferror(stdout)) {
356 (void) fprintf(stderr, "%s: ", progname);
357 (void) perror(gettext("Error writing standard output"));
358 exit(EXIT_FAILURE);
359 }
360 return (EXIT_SUCCESS);
361 }
362
363 static void
364 setabsolutes()
365 {
366 #if defined(sun)
367 absolute_min_time = LONG_MIN;
368 absolute_max_time = LONG_MAX;
369 #else
370 if (0.5 == (time_t)0.5) {
371 /*
372 * time_t is floating.
373 */
374 if (sizeof (time_t) == sizeof (float)) {
375 absolute_min_time = (time_t)-FLT_MAX;
376 absolute_max_time = (time_t)FLT_MAX;
377 } else if (sizeof (time_t) == sizeof (double)) {
378 absolute_min_time = (time_t)-DBL_MAX;
379 absolute_max_time = (time_t)DBL_MAX;
380 } else {
381 (void) fprintf(stderr, gettext("%s: use of -v on "
382 "system with floating time_t other than float "
383 "or double\n"), progname);
384 exit(EXIT_FAILURE);
385 }
386 } else
387 /*CONSTANTCONDITION*/
388 if (0 > (time_t)-1) {
389 /*
390 * time_t is signed.
391 */
392 register time_t hibit;
393
394 for (hibit = 1; (hibit * 2) != 0; hibit *= 2)
395 continue;
396 absolute_min_time = hibit;
397 absolute_max_time = -(hibit + 1);
398 } else {
399 /*
400 * time_t is unsigned.
401 */
402 absolute_min_time = 0;
403 absolute_max_time = absolute_min_time - 1;
404 }
405 #endif
406 }
407
408 static time_t
409 yeartot(y)
410 const long y;
411 {
412 register long myy;
413 register long seconds;
414 register time_t t;
415
416 myy = EPOCH_YEAR;
417 t = 0;
418 while (myy != y) {
419 if (myy < y) {
420 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
421 ++myy;
422 if (t > absolute_max_time - seconds) {
423 t = absolute_max_time;
424 break;
425 }
426 t += seconds;
427 } else {
428 --myy;
429 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
430 if (t < absolute_min_time + seconds) {
431 t = absolute_min_time;
432 break;
433 }
434 t -= seconds;
435 }
436 }
437 return (t);
438 }
439
440 static time_t
441 hunt(name, lot, hit)
442 char *name;
443 time_t lot;
444 time_t hit;
445 {
446 time_t t;
447 long diff;
448 struct tm lotm;
449 register struct tm *lotmp;
450 struct tm tm;
451 register struct tm *tmp;
452 char loab[MAX_STRING_LENGTH];
453
454 lotmp = my_localtime(&lot);
455 if (lotmp != NULL) {
456 lotm = *lotmp;
457 (void) strncpy(loab, abbr(&lotm), sizeof (loab) - 1);
458 }
459 for (;;) {
460 diff = (long)(hit - lot);
461 if (diff < 2)
462 break;
463 t = lot;
464 t += diff / 2;
465 if (t <= lot)
466 ++t;
467 else if (t >= hit)
468 --t;
469 tmp = my_localtime(&t);
470 if (tmp != NULL)
471 tm = *tmp;
472 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
473 (delta(&tm, &lotm) == (t - lot) &&
474 tm.tm_isdst == lotm.tm_isdst &&
475 strcmp(abbr(&tm), loab) == 0)) {
476 lot = t;
477 lotm = tm;
478 lotmp = tmp;
479 } else hit = t;
480 }
481 show(name, lot, TRUE);
482 show(name, hit, TRUE);
483 return (hit);
484 }
485
486 /*
487 * Thanks to Paul Eggert for logic used in delta.
488 */
489
490 static long
491 delta(newp, oldp)
492 struct tm *newp;
493 struct tm *oldp;
494 {
495 register long result;
496 register int tmy;
497
498 if (newp->tm_year < oldp->tm_year)
499 return (-delta(oldp, newp));
500 result = 0;
501 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
502 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
503 result += newp->tm_yday - oldp->tm_yday;
504 result *= HOURSPERDAY;
505 result += newp->tm_hour - oldp->tm_hour;
506 result *= MINSPERHOUR;
507 result += newp->tm_min - oldp->tm_min;
508 result *= SECSPERMIN;
509 result += newp->tm_sec - oldp->tm_sec;
510 return (result);
511 }
512
513 static void
514 show(zone, t, v)
515 char *zone;
516 time_t t;
517 int v;
518 {
519 register struct tm *tmp;
520
521 (void) printf("%-*s ", (int)longest, zone);
522 if (v) {
523 tmp = gmtime(&t);
524 if (tmp == NULL) {
525 (void) printf(tformat(), t);
526 } else {
527 dumptime(tmp);
528 (void) printf(" UTC");
529 }
530 (void) printf(" = ");
531 }
532 tmp = my_localtime(&t);
533 dumptime(tmp);
534 if (tmp != NULL) {
535 if (*abbr(tmp) != '\0')
536 (void) printf(" %s", abbr(tmp));
537 if (v) {
538 (void) printf(" isdst=%d", tmp->tm_isdst);
539 #ifdef TM_GMTOFF
540 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
541 #endif /* defined TM_GMTOFF */
542 }
543 }
544 (void) printf("\n");
545 if (tmp != NULL && *abbr(tmp) != '\0')
546 abbrok(abbr(tmp), zone);
547 }
548
549 static char *
550 abbr(tmp)
551 struct tm *tmp;
552 {
553 register char *result;
554 static char nada;
555
556 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
557 return (&nada);
558 result = tzname[tmp->tm_isdst];
559 return ((result == NULL) ? &nada : result);
560 }
561
562 /*
563 * The code below can fail on certain theoretical systems;
564 * it works on all known real-world systems as of 2004-12-30.
565 */
566
567 static const char *
568 tformat()
569 {
570 #if defined(sun)
571 /* time_t is signed long */
572 return ("%ld");
573 #else
574 /*CONSTANTCONDITION*/
575 if (0.5 == (time_t)0.5) { /* floating */
576 /*CONSTANTCONDITION*/
577 if (sizeof (time_t) > sizeof (double))
578 return ("%Lg");
579 return ("%g");
580 }
581 /*CONSTANTCONDITION*/
582 if (0 > (time_t)-1) { /* signed */
583 /*CONSTANTCONDITION*/
584 if (sizeof (time_t) > sizeof (long))
585 return ("%lld");
586 /*CONSTANTCONDITION*/
587 if (sizeof (time_t) > sizeof (int))
588 return ("%ld");
589 return ("%d");
590 }
591 /*CONSTANTCONDITION*/
592 if (sizeof (time_t) > sizeof (unsigned long))
593 return ("%llu");
594 /*CONSTANTCONDITION*/
595 if (sizeof (time_t) > sizeof (unsigned int))
596 return ("%lu");
597 return ("%u");
598 #endif
599 }
600
601 static void
602 dumptime(timeptr)
603 register const struct tm *timeptr;
604 {
605 static const char wday_name[][3] = {
606 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
607 };
608 static const char mon_name[][3] = {
609 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
610 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
611 };
612 register const char *wn;
613 register const char *mn;
614 register int lead;
615 register int trail;
616
617 if (timeptr == NULL) {
618 (void) printf("NULL");
619 return;
620 }
621 /*
622 * The packaged versions of localtime and gmtime never put out-of-range
623 * values in tm_wday or tm_mon, but since this code might be compiled
624 * with other (perhaps experimental) versions, paranoia is in order.
625 */
626 if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
627 (int)(sizeof (wday_name) / sizeof (wday_name[0])))
628 wn = "???";
629 else wn = wday_name[timeptr->tm_wday];
630 if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
631 (int)(sizeof (mon_name) / sizeof (mon_name[0])))
632 mn = "???";
633 else mn = mon_name[timeptr->tm_mon];
634 (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
635 wn, mn,
636 timeptr->tm_mday, timeptr->tm_hour,
637 timeptr->tm_min, timeptr->tm_sec);
638 #define DIVISOR 10
639 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
640 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
641 trail / DIVISOR;
642 trail %= DIVISOR;
643 if (trail < 0 && lead > 0) {
644 trail += DIVISOR;
645 --lead;
646 } else if (lead < 0 && trail > 0) {
647 trail -= DIVISOR;
648 ++lead;
649 }
650 if (lead == 0)
651 (void) printf("%d", trail);
652 else
653 (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
654 }
655
656 static void
657 usage()
658 {
659 (void) fprintf(stderr, gettext(
660 "%s: [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
661 progname);
662 exit(EXIT_FAILURE);
663 /* NOTREACHED */
664 }