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8322 nl: misleading-indentation
[unleashed/tickless.git] / usr / src / cmd / zdump / zdump.c
blobeae12f775f45bb35da37f6380924f4fb17bdc184
1 /*
2 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
3 * Use is subject to license terms.
4 */
5
6 /*
7 * zdump 7.24
8 * Taken from elsie.nci.nih.gov to replace the existing Solaris zdump,
9 * which was based on an earlier version of the elsie code.
10 *
11 * For zdump 7.24, the following changes were made to the elsie code:
12 * locale/textdomain/messages to match existing Solaris style.
13 * Solaris verbose mode is documented to display the current time first.
14 * cstyle cleaned code.
15 * removed old locale/textdomain code.
16 */
17
18 static char elsieid[] = "@(#)zdump.c 7.74";
19
20 /*
21 * This code has been made independent of the rest of the time
22 * conversion package to increase confidence in the verification it provides.
23 * You can use this code to help in verifying other implementations.
24 */
25
26 #include "stdio.h" /* for stdout, stderr, perror */
27 #include "string.h" /* for strcpy */
28 #include "sys/types.h" /* for time_t */
29 #include "time.h" /* for struct tm */
30 #include "stdlib.h" /* for exit, malloc, atoi */
31 #include "locale.h" /* for setlocale, textdomain */
32 #include "libintl.h"
33 #include <ctype.h>
34 #include "tzfile.h" /* for defines */
35 #include <limits.h>
36
37 #ifndef ZDUMP_LO_YEAR
38 #define ZDUMP_LO_YEAR (-500)
39 #endif /* !defined ZDUMP_LO_YEAR */
40
41 #ifndef ZDUMP_HI_YEAR
42 #define ZDUMP_HI_YEAR 2500
43 #endif /* !defined ZDUMP_HI_YEAR */
44
45 #ifndef MAX_STRING_LENGTH
46 #define MAX_STRING_LENGTH 1024
47 #endif /* !defined MAX_STRING_LENGTH */
48
49 #ifndef TRUE
50 #define TRUE 1
51 #endif /* !defined TRUE */
52
53 #ifndef FALSE
54 #define FALSE 0
55 #endif /* !defined FALSE */
56
57 #ifndef isleap_sum
58 /*
59 * See tzfile.h for details on isleap_sum.
60 */
61 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
62 #endif /* !defined isleap_sum */
63
64 #ifndef SECSPERDAY
65 #define SECSPERDAY ((long)SECSPERHOUR * HOURSPERDAY)
66 #endif
67 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
68 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
69
70 #ifndef GNUC_or_lint
71 #ifdef lint
72 #define GNUC_or_lint
73 #else /* !defined lint */
74 #ifdef __GNUC__
75 #define GNUC_or_lint
76 #endif /* defined __GNUC__ */
77 #endif /* !defined lint */
78 #endif /* !defined GNUC_or_lint */
79
80 #ifndef INITIALIZE
81 #ifdef GNUC_or_lint
82 #define INITIALIZE(x) ((x) = 0)
83 #else /* !defined GNUC_or_lint */
84 #define INITIALIZE(x)
85 #endif /* !defined GNUC_or_lint */
86 #endif /* !defined INITIALIZE */
87
88 static time_t absolute_min_time;
89 static time_t absolute_max_time;
90 static size_t longest;
91 static char *progname;
92 static int warned;
93
94 static char *abbr(struct tm *);
95 static void abbrok(const char *, const char *);
96 static long delta(struct tm *, struct tm *);
97 static void dumptime(const struct tm *);
98 static time_t hunt(char *, time_t, time_t);
99 static void setabsolutes(void);
100 static void show(char *, time_t, int);
101 static void usage(void);
102 static const char *tformat(void);
103 static time_t yeartot(long y);
104
105 #ifndef TYPECHECK
106 #define my_localtime localtime
107 #else /* !defined TYPECHECK */
108 static struct tm *
109 my_localtime(tp)
110 time_t *tp;
111 {
112 register struct tm *tmp;
113
114 tmp = localtime(tp);
115 if (tp != NULL && tmp != NULL) {
116 struct tm tm;
117 register time_t t;
118
119 tm = *tmp;
120 t = mktime(&tm);
121 if (t - *tp >= 1 || *tp - t >= 1) {
122 (void) fflush(stdout);
123 (void) fprintf(stderr, "\n%s: ", progname);
124 (void) fprintf(stderr, tformat(), *tp);
125 (void) fprintf(stderr, " ->");
126 (void) fprintf(stderr, " year=%d", tmp->tm_year);
127 (void) fprintf(stderr, " mon=%d", tmp->tm_mon);
128 (void) fprintf(stderr, " mday=%d", tmp->tm_mday);
129 (void) fprintf(stderr, " hour=%d", tmp->tm_hour);
130 (void) fprintf(stderr, " min=%d", tmp->tm_min);
131 (void) fprintf(stderr, " sec=%d", tmp->tm_sec);
132 (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
133 (void) fprintf(stderr, " -> ");
134 (void) fprintf(stderr, tformat(), t);
135 (void) fprintf(stderr, "\n");
136 }
137 }
138 return (tmp);
139 }
140 #endif /* !defined TYPECHECK */
141
142 static void
143 abbrok(const char * const abbrp, const char * const zone)
144 {
145 register const char *cp;
146 int error = 0;
147
148 if (warned)
149 return;
150 cp = abbrp;
151 while (isalpha(*cp) || isdigit(*cp) || *cp == '-' || *cp == '+')
152 ++cp;
153 (void) fflush(stdout);
154 if (cp - abbrp < 3) {
155 (void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
156 "abbreviation \"%s\" has fewer than 3 alphabetics\n"),
157 progname, zone, abbrp);
158 error = 1;
159 } else if (cp - abbrp > 6) {
160 (void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
161 "abbreviation \"%s\" has more than 6 characters\n"),
162 progname, zone, abbrp);
163 error = 1;
164 } else if (*cp != '\0') {
165 (void) fprintf(stderr, gettext("%s: warning: zone \"%s\" "
166 "abbreviation \"%s\" has characters other than "
167 "alphanumerics\n"), progname, zone, abbrp);
168 error = 1;
169 }
170 if (error)
171 warned = TRUE;
172 }
173
174 int
175 main(argc, argv)
176 int argc;
177 char *argv[];
178 {
179 register int i;
180 register int c;
181 register int vflag;
182 register char *cutarg;
183 register long cutloyear = ZDUMP_LO_YEAR;
184 register long cuthiyear = ZDUMP_HI_YEAR;
185 register time_t cutlotime;
186 register time_t cuthitime;
187 time_t now;
188 time_t t;
189 time_t newt;
190 struct tm tm;
191 struct tm newtm;
192 register struct tm *tmp;
193 register struct tm *newtmp;
194
195 INITIALIZE(cutlotime);
196 INITIALIZE(cuthitime);
197
198 (void) setlocale(LC_ALL, "");
199 #if !defined(TEXT_DOMAIN) /* Should be defined by cc -D */
200 #define TEXT_DOMAIN "SYS_TEST" /* Use this only if it weren't */
201 #endif
202 (void) textdomain(TEXT_DOMAIN);
203
204 progname = argv[0];
205 for (i = 1; i < argc; ++i)
206 if (strcmp(argv[i], "--version") == 0) {
207 (void) printf("%s\n", elsieid);
208 exit(EXIT_SUCCESS);
209 }
210 vflag = 0;
211 cutarg = NULL;
212 while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
213 if (c == 'v')
214 vflag = 1;
215 else cutarg = optarg;
216 if (c != EOF ||
217 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
218 usage();
219 /* NOTREACHED */
220 }
221 if (vflag) {
222 if (cutarg != NULL) {
223 long lo;
224 long hi;
225 char dummy;
226
227 if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
228 cuthiyear = hi;
229 } else if (sscanf(cutarg, "%ld,%ld%c",
230 &lo, &hi, &dummy) == 2) {
231 cutloyear = lo;
232 cuthiyear = hi;
233 } else {
234 (void) fprintf(stderr, gettext("%s: wild -c argument %s\n"),
235 progname, cutarg);
236 exit(EXIT_FAILURE);
237 }
238 }
239 setabsolutes();
240 cutlotime = yeartot(cutloyear);
241 cuthitime = yeartot(cuthiyear);
242 }
243 (void) time(&now);
244 longest = 0;
245 for (i = optind; i < argc; ++i)
246 if (strlen(argv[i]) > longest)
247 longest = strlen(argv[i]);
248
249 for (i = optind; i < argc; ++i) {
250 static char buf[MAX_STRING_LENGTH];
251 static char *tzp = NULL;
252
253 (void) unsetenv("TZ");
254 if (tzp != NULL)
255 free(tzp);
256 if ((tzp = malloc(3 + strlen(argv[i]) + 1)) == NULL) {
257 perror(progname);
258 exit(EXIT_FAILURE);
259 }
260 (void) strcpy(tzp, "TZ=");
261 (void) strcat(tzp, argv[i]);
262 if (putenv(tzp) != 0) {
263 perror(progname);
264 exit(EXIT_FAILURE);
265 }
266 if (!vflag) {
267 show(argv[i], now, FALSE);
268 continue;
269 }
270
271 #if defined(sun)
272 /*
273 * We show the current time first, probably because we froze
274 * the behavior of zdump some time ago and then it got
275 * changed.
276 */
277 show(argv[i], now, TRUE);
278 #endif
279 warned = FALSE;
280 t = absolute_min_time;
281 show(argv[i], t, TRUE);
282 t += SECSPERHOUR * HOURSPERDAY;
283 show(argv[i], t, TRUE);
284 if (t < cutlotime)
285 t = cutlotime;
286 tmp = my_localtime(&t);
287 if (tmp != NULL) {
288 tm = *tmp;
289 (void) strncpy(buf, abbr(&tm), sizeof (buf) - 1);
290 }
291 for (;;) {
292 if (t >= cuthitime)
293 break;
294 /* check if newt will overrun maximum time_t value */
295 if (t > LONG_MAX - (SECSPERHOUR * 12))
296 break;
297 newt = t + SECSPERHOUR * 12;
298 if (newt >= cuthitime)
299 break;
300 newtmp = localtime(&newt);
301 if (newtmp != NULL)
302 newtm = *newtmp;
303 if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
304 (delta(&newtm, &tm) != (newt - t) ||
305 newtm.tm_isdst != tm.tm_isdst ||
306 strcmp(abbr(&newtm), buf) != 0)) {
307 newt = hunt(argv[i], t, newt);
308 newtmp = localtime(&newt);
309 if (newtmp != NULL) {
310 newtm = *newtmp;
311 (void) strncpy(buf,
312 abbr(&newtm),
313 sizeof (buf) - 1);
314 }
315 }
316 t = newt;
317 tm = newtm;
318 tmp = newtmp;
319 }
320 t = absolute_max_time;
321 #if defined(sun)
322 show(argv[i], t, TRUE);
323 t -= SECSPERHOUR * HOURSPERDAY;
324 show(argv[i], t, TRUE);
325 #else /* !defined(sun) */
326 t -= SECSPERHOUR * HOURSPERDAY;
327 show(argv[i], t, TRUE);
328 t += SECSPERHOUR * HOURSPERDAY;
329 show(argv[i], t, TRUE);
330 #endif /* !defined(sun) */
331 }
332 if (fflush(stdout) || ferror(stdout)) {
333 (void) fprintf(stderr, "%s: ", progname);
334 (void) perror(gettext("Error writing standard output"));
335 exit(EXIT_FAILURE);
336 }
337 return (EXIT_SUCCESS);
338 }
339
340 static void
341 setabsolutes()
342 {
343 #if defined(sun)
344 absolute_min_time = LONG_MIN;
345 absolute_max_time = LONG_MAX;
346 #else
347 if (0.5 == (time_t)0.5) {
348 /*
349 * time_t is floating.
350 */
351 if (sizeof (time_t) == sizeof (float)) {
352 absolute_min_time = (time_t)-FLT_MAX;
353 absolute_max_time = (time_t)FLT_MAX;
354 } else if (sizeof (time_t) == sizeof (double)) {
355 absolute_min_time = (time_t)-DBL_MAX;
356 absolute_max_time = (time_t)DBL_MAX;
357 } else {
358 (void) fprintf(stderr, gettext("%s: use of -v on "
359 "system with floating time_t other than float "
360 "or double\n"), progname);
361 exit(EXIT_FAILURE);
362 }
363 } else
364 /*CONSTANTCONDITION*/
365 if (0 > (time_t)-1) {
366 /*
367 * time_t is signed.
368 */
369 register time_t hibit;
370
371 for (hibit = 1; (hibit * 2) != 0; hibit *= 2)
372 continue;
373 absolute_min_time = hibit;
374 absolute_max_time = -(hibit + 1);
375 } else {
376 /*
377 * time_t is unsigned.
378 */
379 absolute_min_time = 0;
380 absolute_max_time = absolute_min_time - 1;
381 }
382 #endif
383 }
384
385 static time_t
386 yeartot(y)
387 const long y;
388 {
389 register long myy;
390 register long seconds;
391 register time_t t;
392
393 myy = EPOCH_YEAR;
394 t = 0;
395 while (myy != y) {
396 if (myy < y) {
397 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
398 ++myy;
399 if (t > absolute_max_time - seconds) {
400 t = absolute_max_time;
401 break;
402 }
403 t += seconds;
404 } else {
405 --myy;
406 seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
407 if (t < absolute_min_time + seconds) {
408 t = absolute_min_time;
409 break;
410 }
411 t -= seconds;
412 }
413 }
414 return (t);
415 }
416
417 static time_t
418 hunt(name, lot, hit)
419 char *name;
420 time_t lot;
421 time_t hit;
422 {
423 time_t t;
424 long diff;
425 struct tm lotm;
426 register struct tm *lotmp;
427 struct tm tm;
428 register struct tm *tmp;
429 char loab[MAX_STRING_LENGTH];
430
431 lotmp = my_localtime(&lot);
432 if (lotmp != NULL) {
433 lotm = *lotmp;
434 (void) strncpy(loab, abbr(&lotm), sizeof (loab) - 1);
435 }
436 for (;;) {
437 diff = (long)(hit - lot);
438 if (diff < 2)
439 break;
440 t = lot;
441 t += diff / 2;
442 if (t <= lot)
443 ++t;
444 else if (t >= hit)
445 --t;
446 tmp = my_localtime(&t);
447 if (tmp != NULL)
448 tm = *tmp;
449 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
450 (delta(&tm, &lotm) == (t - lot) &&
451 tm.tm_isdst == lotm.tm_isdst &&
452 strcmp(abbr(&tm), loab) == 0)) {
453 lot = t;
454 lotm = tm;
455 lotmp = tmp;
456 } else hit = t;
457 }
458 show(name, lot, TRUE);
459 show(name, hit, TRUE);
460 return (hit);
461 }
462
463 /*
464 * Thanks to Paul Eggert for logic used in delta.
465 */
466
467 static long
468 delta(newp, oldp)
469 struct tm *newp;
470 struct tm *oldp;
471 {
472 register long result;
473 register int tmy;
474
475 if (newp->tm_year < oldp->tm_year)
476 return (-delta(oldp, newp));
477 result = 0;
478 for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
479 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
480 result += newp->tm_yday - oldp->tm_yday;
481 result *= HOURSPERDAY;
482 result += newp->tm_hour - oldp->tm_hour;
483 result *= MINSPERHOUR;
484 result += newp->tm_min - oldp->tm_min;
485 result *= SECSPERMIN;
486 result += newp->tm_sec - oldp->tm_sec;
487 return (result);
488 }
489
490 static void
491 show(zone, t, v)
492 char *zone;
493 time_t t;
494 int v;
495 {
496 register struct tm *tmp;
497
498 (void) printf("%-*s ", (int)longest, zone);
499 if (v) {
500 tmp = gmtime(&t);
501 if (tmp == NULL) {
502 (void) printf(tformat(), t);
503 } else {
504 dumptime(tmp);
505 (void) printf(" UTC");
506 }
507 (void) printf(" = ");
508 }
509 tmp = my_localtime(&t);
510 dumptime(tmp);
511 if (tmp != NULL) {
512 if (*abbr(tmp) != '\0')
513 (void) printf(" %s", abbr(tmp));
514 if (v) {
515 (void) printf(" isdst=%d", tmp->tm_isdst);
516 #ifdef TM_GMTOFF
517 (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
518 #endif /* defined TM_GMTOFF */
519 }
520 }
521 (void) printf("\n");
522 if (tmp != NULL && *abbr(tmp) != '\0')
523 abbrok(abbr(tmp), zone);
524 }
525
526 static char *
527 abbr(tmp)
528 struct tm *tmp;
529 {
530 register char *result;
531 static char nada;
532
533 if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
534 return (&nada);
535 result = tzname[tmp->tm_isdst];
536 return ((result == NULL) ? &nada : result);
537 }
538
539 /*
540 * The code below can fail on certain theoretical systems;
541 * it works on all known real-world systems as of 2004-12-30.
542 */
543
544 static const char *
545 tformat()
546 {
547 #if defined(sun)
548 /* time_t is signed long */
549 return ("%ld");
550 #else
551 /*CONSTANTCONDITION*/
552 if (0.5 == (time_t)0.5) { /* floating */
553 /*CONSTANTCONDITION*/
554 if (sizeof (time_t) > sizeof (double))
555 return ("%Lg");
556 return ("%g");
557 }
558 /*CONSTANTCONDITION*/
559 if (0 > (time_t)-1) { /* signed */
560 /*CONSTANTCONDITION*/
561 if (sizeof (time_t) > sizeof (long))
562 return ("%lld");
563 /*CONSTANTCONDITION*/
564 if (sizeof (time_t) > sizeof (int))
565 return ("%ld");
566 return ("%d");
567 }
568 /*CONSTANTCONDITION*/
569 if (sizeof (time_t) > sizeof (unsigned long))
570 return ("%llu");
571 /*CONSTANTCONDITION*/
572 if (sizeof (time_t) > sizeof (unsigned int))
573 return ("%lu");
574 return ("%u");
575 #endif
576 }
577
578 static void
579 dumptime(timeptr)
580 register const struct tm *timeptr;
581 {
582 static const char wday_name[][3] = {
583 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
584 };
585 static const char mon_name[][3] = {
586 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
587 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
588 };
589 register const char *wn;
590 register const char *mn;
591 register int lead;
592 register int trail;
593
594 if (timeptr == NULL) {
595 (void) printf("NULL");
596 return;
597 }
598 /*
599 * The packaged versions of localtime and gmtime never put out-of-range
600 * values in tm_wday or tm_mon, but since this code might be compiled
601 * with other (perhaps experimental) versions, paranoia is in order.
602 */
603 if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
604 (int)(sizeof (wday_name) / sizeof (wday_name[0])))
605 wn = "???";
606 else wn = wday_name[timeptr->tm_wday];
607 if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
608 (int)(sizeof (mon_name) / sizeof (mon_name[0])))
609 mn = "???";
610 else mn = mon_name[timeptr->tm_mon];
611 (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
612 wn, mn,
613 timeptr->tm_mday, timeptr->tm_hour,
614 timeptr->tm_min, timeptr->tm_sec);
615 #define DIVISOR 10
616 trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
617 lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
618 trail / DIVISOR;
619 trail %= DIVISOR;
620 if (trail < 0 && lead > 0) {
621 trail += DIVISOR;
622 --lead;
623 } else if (lead < 0 && trail > 0) {
624 trail -= DIVISOR;
625 ++lead;
626 }
627 if (lead == 0)
628 (void) printf("%d", trail);
629 else
630 (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
631 }
632
633 static void
634 usage()
635 {
636 (void) fprintf(stderr, gettext(
637 "%s: [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
638 progname);
639 exit(EXIT_FAILURE);
640 /* NOTREACHED */
641 }
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