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Merge branch 'misc'
[dragonfly.git] / usr.sbin / zic / zdump.c
blob1374b7cc460cc0b306a8dc3d7737f20a9bf8627c
1 /*
2 * @(#)zdump.c 8.6
3 * $FreeBSD: src/usr.sbin/zic/zdump.c,v 1.7 1999/08/28 01:21:19 peter Exp $
4 * $DragonFly: src/usr.sbin/zic/zdump.c,v 1.5 2008/10/19 20:15:58 swildner Exp $
5 */
6 /*
7 ** This code has been made independent of the rest of the time
8 ** conversion package to increase confidence in the verification it provides.
9 ** You can use this code to help in verifying other implementations.
10 */
11
12 #include <ctype.h> /* for isalpha et al. */
13 #include <err.h>
14 #include <float.h> /* for FLT_MAX and DBL_MAX */
15 #include <stdio.h> /* for stdout, stderr */
16 #include <stdlib.h> /* for exit, malloc, atoi */
17 #include <string.h> /* for strcpy */
18 #include <sys/types.h> /* for time_t */
19 #include <time.h> /* for struct tm */
20 #include <unistd.h>
21
22 #ifndef ZDUMP_LO_YEAR
23 #define ZDUMP_LO_YEAR (-500)
24 #endif /* !defined ZDUMP_LO_YEAR */
25
26 #ifndef ZDUMP_HI_YEAR
27 #define ZDUMP_HI_YEAR 2500
28 #endif /* !defined ZDUMP_HI_YEAR */
29
30 #ifndef MAX_STRING_LENGTH
31 #define MAX_STRING_LENGTH 1024
32 #endif /* !defined MAX_STRING_LENGTH */
33
34 #ifndef TRUE
35 #define TRUE 1
36 #endif /* !defined TRUE */
37
38 #ifndef FALSE
39 #define FALSE 0
40 #endif /* !defined FALSE */
41
42 #ifndef EXIT_SUCCESS
43 #define EXIT_SUCCESS 0
44 #endif /* !defined EXIT_SUCCESS */
45
46 #ifndef EXIT_FAILURE
47 #define EXIT_FAILURE 1
48 #endif /* !defined EXIT_FAILURE */
49
50 #ifndef SECSPERMIN
51 #define SECSPERMIN 60
52 #endif /* !defined SECSPERMIN */
53
54 #ifndef MINSPERHOUR
55 #define MINSPERHOUR 60
56 #endif /* !defined MINSPERHOUR */
57
58 #ifndef SECSPERHOUR
59 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
60 #endif /* !defined SECSPERHOUR */
61
62 #ifndef HOURSPERDAY
63 #define HOURSPERDAY 24
64 #endif /* !defined HOURSPERDAY */
65
66 #ifndef EPOCH_YEAR
67 #define EPOCH_YEAR 1970
68 #endif /* !defined EPOCH_YEAR */
69
70 #ifndef TM_YEAR_BASE
71 #define TM_YEAR_BASE 1900
72 #endif /* !defined TM_YEAR_BASE */
73
74 #ifndef DAYSPERNYEAR
75 #define DAYSPERNYEAR 365
76 #endif /* !defined DAYSPERNYEAR */
77
78 #ifndef isleap
79 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
80 #endif /* !defined isleap */
81
82 #ifndef isleap_sum
83 /*
84 ** See tzfile.h for details on isleap_sum.
85 */
86 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
87 #endif /* !defined isleap_sum */
88
89 #define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
90 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
91 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
92
93 #ifndef GNUC_or_lint
94 #ifdef lint
95 #define GNUC_or_lint
96 #else /* !defined lint */
97 #ifdef __GNUC__
98 #define GNUC_or_lint
99 #endif /* defined __GNUC__ */
100 #endif /* !defined lint */
101 #endif /* !defined GNUC_or_lint */
102
103 #ifndef INITIALIZE
104 #ifdef GNUC_or_lint
105 #define INITIALIZE(x) ((x) = 0)
106 #else /* !defined GNUC_or_lint */
107 #define INITIALIZE(x)
108 #endif /* !defined GNUC_or_lint */
109 #endif /* !defined INITIALIZE */
110
111 /*
112 ** For the benefit of GNU folk...
113 ** `_(MSGID)' uses the current locale's message library string for MSGID.
114 ** The default is to use gettext if available, and use MSGID otherwise.
115 */
116
117 #ifndef _
118 #define _(msgid) msgid
119 #endif /* !defined _ */
120
121 #ifndef TZ_DOMAIN
122 #define TZ_DOMAIN "tz"
123 #endif /* !defined TZ_DOMAIN */
124
125 extern char ** environ;
126 extern char * tzname[2];
127
128 static time_t absolute_min_time;
129 static time_t absolute_max_time;
130 static size_t longest;
131 static int warned;
132
133 static char *abbr(struct tm *tmp);
134 static void abbrok(const char *abbrp, const char *zone);
135 static long delta(struct tm *newp, struct tm *oldp);
136 static void dumptime(const struct tm *tmp);
137 static time_t hunt(char *name, time_t lot, time_t hit);
138 static void setabsolutes(void);
139 static void show(char *zone, time_t t, int v);
140 static const char *tformat(void);
141 static time_t yeartot(long y);
142 static void usage(void);
143
144 #ifndef TYPECHECK
145 #define my_localtime localtime
146 #else /* !defined TYPECHECK */
147 static struct tm *
148 my_localtime(time_t *tp)
149 {
150 struct tm * tmp;
151
152 tmp = localtime(tp);
153 if (tp != NULL && tmp != NULL) {
154 struct tm tm;
155 time_t t;
156
157 tm = *tmp;
158 t = mktime(&tm);
159 if (t - *tp >= 1 || *tp - t >= 1) {
160 fflush(stdout);
161 fprintf(stderr, "\n%s: ", progname);
162 fprintf(stderr, tformat(), *tp);
163 fprintf(stderr, " ->");
164 fprintf(stderr, " year=%d", tmp->tm_year);
165 fprintf(stderr, " mon=%d", tmp->tm_mon);
166 fprintf(stderr, " mday=%d", tmp->tm_mday);
167 fprintf(stderr, " hour=%d", tmp->tm_hour);
168 fprintf(stderr, " min=%d", tmp->tm_min);
169 fprintf(stderr, " sec=%d", tmp->tm_sec);
170 fprintf(stderr, " isdst=%d", tmp->tm_isdst);
171 fprintf(stderr, " -> ");
172 fprintf(stderr, tformat(), t);
173 fprintf(stderr, "\n");
174 }
175 }
176 return tmp;
177 }
178 #endif /* !defined TYPECHECK */
179
180 static void
181 abbrok(const char * const abbrp, const char * const zone)
182 {
183 const char *cp;
184 char *wp;
185
186 if (warned)
187 return;
188 cp = abbrp;
189 wp = NULL;
190 while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp))
191 ++cp;
192 if (cp - abbrp == 0)
193 wp = _("lacks alphabetic at start");
194 else if (cp - abbrp < 3)
195 wp = _("has fewer than 3 alphabetics");
196 else if (cp - abbrp > 6)
197 wp = _("has more than 6 alphabetics");
198 if (wp == NULL && (*cp == '+' || *cp == '-')) {
199 ++cp;
200 if (isascii((unsigned char) *cp) &&
201 isdigit((unsigned char) *cp))
202 if (*cp++ == '1' && *cp >= '0' && *cp <= '4')
203 ++cp;
204 if (*cp != '\0')
205 wp = _("differs from POSIX standard");
206 }
207 if (wp == NULL)
208 return;
209 fflush(stdout);
210 warnx(_("warning: zone \"%s\" abbreviation \"%s\" %s\n"),
211 zone, abbrp, wp);
212 warned = TRUE;
213 }
214
215 int
216 main(int argc, char *argv[])
217 {
218 int i;
219 int c;
220 int vflag;
221 char *cutarg;
222 long cutloyear = ZDUMP_LO_YEAR;
223 long cuthiyear = ZDUMP_HI_YEAR;
224 time_t cutlotime;
225 time_t cuthitime;
226 char **fakeenv;
227 time_t now;
228 time_t t;
229 time_t newt;
230 struct tm tm;
231 struct tm newtm;
232 struct tm *tmp;
233 struct tm *newtmp;
234
235 INITIALIZE(cutlotime);
236 INITIALIZE(cuthitime);
237 vflag = 0;
238 cutarg = NULL;
239 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
240 if (c == 'v')
241 vflag = 1;
242 else cutarg = optarg;
243 if ((c != EOF && c != -1) ||
244 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
245 usage();
246 }
247 if (vflag) {
248 if (cutarg != NULL) {
249 long lo;
250 long hi;
251 char dummy;
252
253 if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
254 cuthiyear = hi;
255 } else if (sscanf(cutarg, "%ld,%ld%c",
256 &lo, &hi, &dummy) == 2) {
257 cutloyear = lo;
258 cuthiyear = hi;
259 } else {
260 errx(EXIT_FAILURE,
261 _("%s: wild -c argument %s\n"),
262 cutarg);
263 }
264 }
265 setabsolutes();
266 cutlotime = yeartot(cutloyear);
267 cuthitime = yeartot(cuthiyear);
268 }
269 time(&now);
270 longest = 0;
271 for (i = optind; i < argc; ++i)
272 if (strlen(argv[i]) > longest)
273 longest = strlen(argv[i]);
274 {
275 int from;
276 int to;
277
278 for (i = 0; environ[i] != NULL; ++i)
279 continue;
280 fakeenv = (char **) malloc((size_t) ((i + 2) *
281 sizeof *fakeenv));
282 if (fakeenv == NULL ||
283 (fakeenv[0] = (char *) malloc((size_t) (longest +
284 4))) == NULL)
285 errx(EXIT_FAILURE,
286 _("malloc() failed"));
287 to = 0;
288 strcpy(fakeenv[to++], "TZ=");
289 for (from = 0; environ[from] != NULL; ++from)
290 if (strncmp(environ[from], "TZ=", 3) != 0)
291 fakeenv[to++] = environ[from];
292 fakeenv[to] = NULL;
293 environ = fakeenv;
294 }
295 for (i = optind; i < argc; ++i) {
296 static char buf[MAX_STRING_LENGTH];
297
298 strcpy(&fakeenv[0][3], argv[i]);
299 if (!vflag) {
300 show(argv[i], now, FALSE);
301 continue;
302 }
303 warned = FALSE;
304 t = absolute_min_time;
305 show(argv[i], t, TRUE);
306 t += SECSPERHOUR * HOURSPERDAY;
307 show(argv[i], t, TRUE);
308 if (t < cutlotime)
309 t = cutlotime;
310 tmp = my_localtime(&t);
311 if (tmp != NULL) {
312 tm = *tmp;
313 strncpy(buf, abbr(&tm), (sizeof buf) - 1);
314 }
315 for ( ; ; ) {
316 if (t >= cuthitime)
317 break;
318 newt = t + SECSPERHOUR * 12;
319 if (newt >= cuthitime)
320 break;
321 if (newt <= t)
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 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 t -= SECSPERHOUR * HOURSPERDAY;
345 show(argv[i], t, TRUE);
346 t += SECSPERHOUR * HOURSPERDAY;
347 show(argv[i], t, TRUE);
348 }
349 if (fflush(stdout) || ferror(stdout))
350 errx(EXIT_FAILURE, _("error writing standard output"));
351 exit(EXIT_SUCCESS);
352 /* If exit fails to exit... */
353 return EXIT_FAILURE;
354 }
355
356 static void
357 setabsolutes(void)
358 {
359 if (0.5 == (time_t) 0.5) {
360 /*
361 ** time_t is floating.
362 */
363 if (sizeof (time_t) == sizeof (float)) {
364 absolute_min_time = (time_t) -FLT_MAX;
365 absolute_max_time = (time_t) FLT_MAX;
366 } else if (sizeof (time_t) == sizeof (double)) {
367 absolute_min_time = (time_t) -DBL_MAX;
368 absolute_max_time = (time_t) DBL_MAX;
369 } else {
370 errx(EXIT_FAILURE,
371 _("use of -v on system with floating time_t other than float or double\n"));
372 }
373 } else if (0 > (time_t) -1) {
374 /*
375 ** time_t is signed. Assume overflow wraps around.
376 */
377 time_t t = 0;
378 time_t t1 = 1;
379
380 while (t < t1) {
381 t = t1;
382 t1 = 2 * t1 + 1;
383 }
384
385 absolute_max_time = t;
386 t = -t;
387 absolute_min_time = t - 1;
388 if (t < absolute_min_time)
389 absolute_min_time = t;
390 } else {
391 /*
392 ** time_t is unsigned.
393 */
394 absolute_min_time = 0;
395 absolute_max_time = absolute_min_time - 1;
396 }
397 }
398
399 static void
400 usage(void)
401 {
402 fprintf(stderr, _("usage: zdump [-v] [-c cutoff] zonename ...\n"));
403 exit(EXIT_FAILURE);
404 }
405
406 static time_t
407 yeartot(const long y)
408 {
409 long myy;
410 long seconds;
411 time_t t;
412
413 myy = EPOCH_YEAR;
414 t = 0;
415 while (myy != y) {
416 if (myy < y) {
417 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
418 ++myy;
419 if (t > absolute_max_time - seconds) {
420 t = absolute_max_time;
421 break;
422 }
423 t += seconds;
424 } else {
425 --myy;
426 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
427 if (t < absolute_min_time + seconds) {
428 t = absolute_min_time;
429 break;
430 }
431 t -= seconds;
432 }
433 }
434 return t;
435 }
436
437 static time_t
438 hunt(char *name, time_t lot, time_t hit)
439 {
440 time_t t;
441 long diff;
442 struct tm lotm;
443 struct tm * lotmp;
444 struct tm tm;
445 struct tm * tmp;
446 char loab[MAX_STRING_LENGTH];
447
448 lotmp = my_localtime(&lot);
449 if (lotmp != NULL) {
450 lotm = *lotmp;
451 strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
452 }
453 for ( ; ; ) {
454 diff = (long) (hit - lot);
455 if (diff < 2)
456 break;
457 t = lot;
458 t += diff / 2;
459 if (t <= lot)
460 ++t;
461 else if (t >= hit)
462 --t;
463 tmp = my_localtime(&t);
464 if (tmp != NULL)
465 tm = *tmp;
466 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
467 (delta(&tm, &lotm) == (t - lot) &&
468 tm.tm_isdst == lotm.tm_isdst &&
469 strcmp(abbr(&tm), loab) == 0)) {
470 lot = t;
471 lotm = tm;
472 lotmp = tmp;
473 } else hit = t;
474 }
475 show(name, lot, TRUE);
476 show(name, hit, TRUE);
477 return hit;
478 }
479
480 /*
481 ** Thanks to Paul Eggert for logic used in delta.
482 */
483
484 static long
485 delta(struct tm *newp, struct tm *oldp)
486 {
487 long result;
488 int tmy;
489
490 if (newp->tm_year < oldp->tm_year)
491 return -delta(oldp, newp);
492 result = 0;
493 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
494 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
495 result += newp->tm_yday - oldp->tm_yday;
496 result *= HOURSPERDAY;
497 result += newp->tm_hour - oldp->tm_hour;
498 result *= MINSPERHOUR;
499 result += newp->tm_min - oldp->tm_min;
500 result *= SECSPERMIN;
501 result += newp->tm_sec - oldp->tm_sec;
502 return result;
503 }
504
505 static void
506 show(char *zone, time_t t, int v)
507 {
508 struct tm * tmp;
509
510 printf("%-*s ", (int) longest, zone);
511 if (v) {
512 tmp = gmtime(&t);
513 if (tmp == NULL) {
514 printf(tformat(), t);
515 } else {
516 dumptime(tmp);
517 printf(" UTC");
518 }
519 printf(" = ");
520 }
521 tmp = my_localtime(&t);
522 dumptime(tmp);
523 if (tmp != NULL) {
524 if (*abbr(tmp) != '\0')
525 printf(" %s", abbr(tmp));
526 if (v) {
527 printf(" isdst=%d", tmp->tm_isdst);
528 #ifdef TM_GMTOFF
529 printf(" gmtoff=%ld", tmp->TM_GMTOFF);
530 #endif /* defined TM_GMTOFF */
531 }
532 }
533 printf("\n");
534 if (tmp != NULL && *abbr(tmp) != '\0')
535 abbrok(abbr(tmp), zone);
536 }
537
538 static char *
539 abbr(struct tm *tmp)
540 {
541 char * result;
542 static char nada;
543
544 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
545 return &nada;
546 result = tzname[tmp->tm_isdst];
547 return (result == NULL) ? &nada : result;
548 }
549
550 /*
551 ** The code below can fail on certain theoretical systems;
552 ** it works on all known real-world systems as of 2004-12-30.
553 */
554
555 static const char *
556 tformat(void)
557 {
558 if (0.5 == (time_t) 0.5) { /* floating */
559 if (sizeof (time_t) > sizeof (double))
560 return "%Lg";
561 return "%g";
562 }
563 if (0 > (time_t) -1) { /* signed */
564 if (sizeof (time_t) > sizeof (long))
565 return "%lld";
566 if (sizeof (time_t) > sizeof (int))
567 return "%ld";
568 return "%d";
569 }
570 if (sizeof (time_t) > sizeof (unsigned long))
571 return "%llu";
572 if (sizeof (time_t) > sizeof (unsigned int))
573 return "%lu";
574 return "%u";
575 }
576
577 static void
578 dumptime(const struct tm *timeptr)
579 {
580 static const char wday_name[][3] = {
581 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
582 };
583 static const char mon_name[][3] = {
584 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
585 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
586 };
587 const char * wn;
588 const char * mn;
589 int lead;
590 int trail;
591
592 if (timeptr == NULL) {
593 printf("NULL");
594 return;
595 }
596 /*
597 ** The packaged versions of localtime and gmtime never put out-of-range
598 ** values in tm_wday or tm_mon, but since this code might be compiled
599 ** with other (perhaps experimental) versions, paranoia is in order.
600 */
601 if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
602 (int) (sizeof wday_name / sizeof wday_name[0]))
603 wn = "???";
604 else wn = wday_name[timeptr->tm_wday];
605 if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
606 (int) (sizeof mon_name / sizeof mon_name[0]))
607 mn = "???";
608 else mn = mon_name[timeptr->tm_mon];
609 printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
610 wn, mn,
611 timeptr->tm_mday, timeptr->tm_hour,
612 timeptr->tm_min, timeptr->tm_sec);
613 #define DIVISOR 10
614 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
615 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
616 trail / DIVISOR;
617 trail %= DIVISOR;
618 if (trail < 0 && lead > 0) {
619 trail += DIVISOR;
620 --lead;
621 } else if (lead < 0 && trail > 0) {
622 trail -= DIVISOR;
623 ++lead;
624 }
625 if (lead == 0)
626 printf("%d", trail);
627 else printf("%d%d", lead, ((trail < 0) ? -trail : trail));
628 }
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