bd7132698f8bc6959c721740bb0e00215855e4f4
[kopensolaris-gnu/glibc.git] / timezone / zdump.c
1 static char     elsieid[] = "@(#)zdump.c        7.61";
2
3 /*
4 ** This code has been made independent of the rest of the time
5 ** conversion package to increase confidence in the verification it provides.
6 ** You can use this code to help in verifying other implementations.
7 */
8
9 #include "stdio.h"      /* for stdout, stderr, perror */
10 #include "string.h"     /* for strcpy */
11 #include "sys/types.h"  /* for time_t */
12 #include "time.h"       /* for struct tm */
13 #include "stdlib.h"     /* for exit, malloc, atoi */
14 #include "float.h"      /* for FLT_MAX and DBL_MAX */
15
16 #ifndef ZDUMP_LO_YEAR
17 #define ZDUMP_LO_YEAR   (-500)
18 #endif /* !defined ZDUMP_LO_YEAR */
19
20 #ifndef ZDUMP_HI_YEAR
21 #define ZDUMP_HI_YEAR   2500
22 #endif /* !defined ZDUMP_HI_YEAR */
23
24 #ifndef MAX_STRING_LENGTH
25 #define MAX_STRING_LENGTH       1024
26 #endif /* !defined MAX_STRING_LENGTH */
27
28 #ifndef TRUE
29 #define TRUE            1
30 #endif /* !defined TRUE */
31
32 #ifndef FALSE
33 #define FALSE           0
34 #endif /* !defined FALSE */
35
36 #ifndef EXIT_SUCCESS
37 #define EXIT_SUCCESS    0
38 #endif /* !defined EXIT_SUCCESS */
39
40 #ifndef EXIT_FAILURE
41 #define EXIT_FAILURE    1
42 #endif /* !defined EXIT_FAILURE */
43
44 #ifndef SECSPERMIN
45 #define SECSPERMIN      60
46 #endif /* !defined SECSPERMIN */
47
48 #ifndef MINSPERHOUR
49 #define MINSPERHOUR     60
50 #endif /* !defined MINSPERHOUR */
51
52 #ifndef SECSPERHOUR
53 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
54 #endif /* !defined SECSPERHOUR */
55
56 #ifndef HOURSPERDAY
57 #define HOURSPERDAY     24
58 #endif /* !defined HOURSPERDAY */
59
60 #ifndef EPOCH_YEAR
61 #define EPOCH_YEAR      1970
62 #endif /* !defined EPOCH_YEAR */
63
64 #ifndef TM_YEAR_BASE
65 #define TM_YEAR_BASE    1900
66 #endif /* !defined TM_YEAR_BASE */
67
68 #ifndef DAYSPERNYEAR
69 #define DAYSPERNYEAR    365
70 #endif /* !defined DAYSPERNYEAR */
71
72 #ifndef isleap
73 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
74 #endif /* !defined isleap */
75
76 #ifndef isleap_sum
77 /*
78 ** See tzfile.h for details on isleap_sum.
79 */
80 #define isleap_sum(a, b)        isleap((a) % 400 + (b) % 400)
81 #endif /* !defined isleap_sum */
82
83 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
84 #define SECSPERNYEAR    (SECSPERDAY * DAYSPERNYEAR)
85 #define SECSPERLYEAR    (SECSPERNYEAR + SECSPERDAY)
86
87 #if HAVE_GETTEXT
88 #include "locale.h"     /* for setlocale */
89 #include "libintl.h"
90 #endif /* HAVE_GETTEXT */
91
92 #ifndef GNUC_or_lint
93 #ifdef lint
94 #define GNUC_or_lint
95 #else /* !defined lint */
96 #ifdef __GNUC__
97 #define GNUC_or_lint
98 #endif /* defined __GNUC__ */
99 #endif /* !defined lint */
100 #endif /* !defined GNUC_or_lint */
101
102 #ifndef INITIALIZE
103 #ifdef GNUC_or_lint
104 #define INITIALIZE(x)   ((x) = 0)
105 #else /* !defined GNUC_or_lint */
106 #define INITIALIZE(x)
107 #endif /* !defined GNUC_or_lint */
108 #endif /* !defined INITIALIZE */
109
110 /*
111 ** For the benefit of GNU folk...
112 ** `_(MSGID)' uses the current locale's message library string for MSGID.
113 ** The default is to use gettext if available, and use MSGID otherwise.
114 */
115
116 #ifndef _
117 #if HAVE_GETTEXT
118 #define _(msgid) gettext(msgid)
119 #else /* !HAVE_GETTEXT */
120 #define _(msgid) msgid
121 #endif /* !HAVE_GETTEXT */
122 #endif /* !defined _ */
123
124 #ifndef TZ_DOMAIN
125 #define TZ_DOMAIN "tz"
126 #endif /* !defined TZ_DOMAIN */
127
128 #ifndef P
129 #ifdef __STDC__
130 #define P(x)    x
131 #else /* !defined __STDC__ */
132 #define P(x)    ()
133 #endif /* !defined __STDC__ */
134 #endif /* !defined P */
135
136 extern char **  environ;
137 extern int      getopt P((int argc, char * const argv[],
138                         const char * options));
139 extern char *   optarg;
140 extern int      optind;
141 extern char *   tzname[2];
142
143 static time_t   absolute_min_time;
144 static time_t   absolute_max_time;
145 static size_t   longest;
146 static char *   progname;
147
148 static char *   abbr P((struct tm * tmp));
149 static long     delta P((struct tm * newp, struct tm * oldp));
150 static void     dumptime P((const struct tm * tmp));
151 static time_t   hunt P((char * name, time_t lot, time_t hit));
152 static void     setabsolutes P((void));
153 static void     show P((char * zone, time_t t, int v));
154 static const char *     tformat P((void));
155 static time_t   yeartot P((long y));
156
157 #ifndef TYPECHECK
158 #define my_localtime    localtime
159 #else /* !defined TYPECHECK */
160 static struct tm *
161 my_localtime(tp)
162 time_t *        tp;
163 {
164         register struct tm *    tmp;
165
166         tmp = localtime(tp);
167         if (tp != NULL && tmp != NULL) {
168                 struct tm       tm;
169                 register time_t t;
170
171                 tm = *tmp;
172                 t = mktime(&tm);
173                 if (t - *tp >= 1 || *tp - t >= 1) {
174                         (void) fflush(stdout);
175                         (void) fprintf(stderr, "\n%s: ", progname);
176                         (void) fprintf(stderr, tformat(), *tp);
177                         (void) fprintf(stderr, " ->");
178                         (void) fprintf(stderr, " sec %d", tmp->tm_sec);
179                         (void) fprintf(stderr, " min %d", tmp->tm_min);
180                         (void) fprintf(stderr, " hour %d", tmp->tm_hour);
181                         (void) fprintf(stderr, " mday %d", tmp->tm_mday);
182                         (void) fprintf(stderr, " mon %d", tmp->tm_mon);
183                         (void) fprintf(stderr, " year %d", tmp->tm_year);
184                         (void) fprintf(stderr, " -> ");
185                         (void) fprintf(stderr, tformat(), t);
186                         (void) fprintf(stderr, "\n");
187                 }
188         }
189         return tmp;
190 }
191 #endif /* !defined TYPECHECK */
192
193 int
194 main(argc, argv)
195 int     argc;
196 char *  argv[];
197 {
198         register int            i;
199         register int            c;
200         register int            vflag;
201         register char *         cutarg;
202         register long           cutloyear = ZDUMP_LO_YEAR;
203         register long           cuthiyear = ZDUMP_HI_YEAR;
204         register time_t         cutlotime;
205         register time_t         cuthitime;
206         register char **        fakeenv;
207         time_t                  now;
208         time_t                  t;
209         time_t                  newt;
210         struct tm               tm;
211         struct tm               newtm;
212         register struct tm *    tmp;
213         register struct tm *    newtmp;
214
215         INITIALIZE(cutlotime);
216         INITIALIZE(cuthitime);
217 #if HAVE_GETTEXT
218         (void) setlocale(LC_MESSAGES, "");
219 #ifdef TZ_DOMAINDIR
220         (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
221 #endif /* defined TEXTDOMAINDIR */
222         (void) textdomain(TZ_DOMAIN);
223 #endif /* HAVE_GETTEXT */
224         progname = argv[0];
225         for (i = 1; i < argc; ++i)
226                 if (strcmp(argv[i], "--version") == 0) {
227                         (void) printf("%s\n", elsieid);
228                         (void) exit(EXIT_SUCCESS);
229                 }
230         vflag = 0;
231         cutarg = NULL;
232         while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
233                 if (c == 'v')
234                         vflag = 1;
235                 else    cutarg = optarg;
236         if ((c != EOF && c != -1) ||
237                 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
238                         (void) fprintf(stderr,
239 _("%s: usage is %s [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
240                                 progname, progname);
241                         (void) exit(EXIT_FAILURE);
242         }
243         if (vflag) {
244                 if (cutarg != NULL) {
245                         long    lo;
246                         long    hi;
247                         char    dummy;
248
249                         if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
250                                 cuthiyear = hi;
251                         } else if (sscanf(cutarg, "%ld,%ld%c",
252                                 &lo, &hi, &dummy) == 2) {
253                                         cutloyear = lo;
254                                         cuthiyear = hi;
255                         } else {
256 (void) fprintf(stderr, _("%s: wild -c argument %s\n"),
257                                         progname, cutarg);
258                                 (void) exit(EXIT_FAILURE);
259                         }
260                 }
261                 setabsolutes();
262                 cutlotime = yeartot(cutloyear);
263                 cuthitime = yeartot(cuthiyear);
264         }
265         (void) time(&now);
266         longest = 0;
267         for (i = optind; i < argc; ++i)
268                 if (strlen(argv[i]) > longest)
269                         longest = strlen(argv[i]);
270         {
271                 register int    from;
272                 register int    to;
273
274                 for (i = 0; environ[i] != NULL; ++i)
275                         continue;
276                 fakeenv = (char **) malloc((size_t) ((i + 2) *
277                         sizeof *fakeenv));
278                 if (fakeenv == NULL ||
279                         (fakeenv[0] = (char *) malloc(longest + 4)) == NULL) {
280                                         (void) perror(progname);
281                                         (void) exit(EXIT_FAILURE);
282                 }
283                 to = 0;
284                 (void) strcpy(fakeenv[to++], "TZ=");
285                 for (from = 0; environ[from] != NULL; ++from)
286                         if (strncmp(environ[from], "TZ=", 3) != 0)
287                                 fakeenv[to++] = environ[from];
288                 fakeenv[to] = NULL;
289                 environ = fakeenv;
290         }
291         for (i = optind; i < argc; ++i) {
292                 static char     buf[MAX_STRING_LENGTH];
293
294                 (void) strcpy(&fakeenv[0][3], argv[i]);
295                 if (!vflag) {
296                         show(argv[i], now, FALSE);
297                         continue;
298                 }
299                 t = absolute_min_time;
300                 show(argv[i], t, TRUE);
301                 t += SECSPERHOUR * HOURSPERDAY;
302                 show(argv[i], t, TRUE);
303                 if (t < cutlotime)
304                         t = cutlotime;
305                 tmp = my_localtime(&t);
306                 if (tmp != NULL) {
307                         tm = *tmp;
308                         (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
309                 }
310                 for ( ; ; ) {
311                         if (t >= cuthitime)
312                                 break;
313                         newt = t + SECSPERHOUR * 12;
314                         if (newt >= cuthitime)
315                                 break;
316                         if (newt <= t)
317                                 break;
318                         newtmp = localtime(&newt);
319                         if (newtmp != NULL)
320                                 newtm = *newtmp;
321                         if ((tmp == NULL || newtmp == NULL) ?  (tmp != newtmp) :
322                                 (delta(&newtm, &tm) != (newt - t) ||
323                                 newtm.tm_isdst != tm.tm_isdst ||
324                                 strcmp(abbr(&newtm), buf) != 0)) {
325                                         newt = hunt(argv[i], t, newt);
326                                         newtmp = localtime(&newt);
327                                         if (newtmp != NULL) {
328                                                 newtm = *newtmp;
329                                                 (void) strncpy(buf,
330                                                         abbr(&newtm),
331                                                         (sizeof buf) - 1);
332                                         }
333                         }
334                         t = newt;
335                         tm = newtm;
336                         tmp = newtmp;
337                 }
338                 t = absolute_max_time;
339                 t -= SECSPERHOUR * HOURSPERDAY;
340                 show(argv[i], t, TRUE);
341                 t += SECSPERHOUR * HOURSPERDAY;
342                 show(argv[i], t, TRUE);
343         }
344         if (fflush(stdout) || ferror(stdout)) {
345                 (void) fprintf(stderr, "%s: ", progname);
346                 (void) perror(_("Error writing standard output"));
347                 (void) exit(EXIT_FAILURE);
348         }
349         exit(EXIT_SUCCESS);
350         /* If exit fails to exit... */
351         return EXIT_FAILURE;
352 }
353
354 static void
355 setabsolutes()
356 {
357         if (0.5 == (time_t) 0.5) {
358                 /*
359                 ** time_t is floating.
360                 */
361                 if (sizeof (time_t) == sizeof (float)) {
362                         absolute_min_time = (time_t) -FLT_MAX;
363                         absolute_max_time = (time_t) FLT_MAX;
364                 } else if (sizeof (time_t) == sizeof (double)) {
365                         absolute_min_time = (time_t) -DBL_MAX;
366                         absolute_max_time = (time_t) DBL_MAX;
367                 } else {
368                         (void) fprintf(stderr,
369 _("%s: use of -v on system with floating time_t other than float or double\n"),
370                                 progname);
371                         (void) exit(EXIT_FAILURE);
372                 }
373         } else if (0 > (time_t) -1) {
374                 /*
375                 ** time_t is signed.
376                 */
377                 register time_t hibit;
378
379                 for (hibit = 1; (hibit * 2) != 0; hibit *= 2)
380                         continue;
381                 absolute_min_time = hibit;
382                 absolute_max_time = -(hibit + 1);
383         } else {
384                 /*
385                 ** time_t is unsigned.
386                 */
387                 absolute_min_time = 0;
388                 absolute_max_time = absolute_min_time - 1;
389         }
390 }
391
392 static time_t
393 yeartot(y)
394 const long      y;
395 {
396         register long   myy;
397         register long   seconds;
398         register time_t t;
399
400         myy = EPOCH_YEAR;
401         t = 0;
402         while (myy != y) {
403                 if (myy < y) {
404                         seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
405                         ++myy;
406                         if (t > absolute_max_time - seconds) {
407                                 t = absolute_max_time;
408                                 break;
409                         }
410                         t += seconds;
411                 } else {
412                         --myy;
413                         seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
414                         if (t < absolute_min_time + seconds) {
415                                 t = absolute_min_time;
416                                 break;
417                         }
418                         t -= seconds;
419                 }
420         }
421         return t;
422 }
423
424 static time_t
425 hunt(name, lot, hit)
426 char *  name;
427 time_t  lot;
428 time_t  hit;
429 {
430         time_t                  t;
431         long                    diff;
432         struct tm               lotm;
433         register struct tm *    lotmp;
434         struct tm               tm;
435         register struct tm *    tmp;
436         char                    loab[MAX_STRING_LENGTH];
437
438         lotmp = my_localtime(&lot);
439         if (lotmp != NULL) {
440                 lotm = *lotmp;
441                 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
442         }
443         for ( ; ; ) {
444                 diff = (long) (hit - lot);
445                 if (diff < 2)
446                         break;
447                 t = lot;
448                 t += diff / 2;
449                 if (t <= lot)
450                         ++t;
451                 else if (t >= hit)
452                         --t;
453                 tmp = my_localtime(&t);
454                 if (tmp != NULL)
455                         tm = *tmp;
456                 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
457                         (delta(&tm, &lotm) == (t - lot) &&
458                         tm.tm_isdst == lotm.tm_isdst &&
459                         strcmp(abbr(&tm), loab) == 0)) {
460                                 lot = t;
461                                 lotm = tm;
462                                 lotmp = tmp;
463                 } else  hit = t;
464         }
465         show(name, lot, TRUE);
466         show(name, hit, TRUE);
467         return hit;
468 }
469
470 /*
471 ** Thanks to Paul Eggert (eggert@twinsun.com) for logic used in delta.
472 */
473
474 static long
475 delta(newp, oldp)
476 struct tm *     newp;
477 struct tm *     oldp;
478 {
479         register long   result;
480         register int    tmy;
481
482         if (newp->tm_year < oldp->tm_year)
483                 return -delta(oldp, newp);
484         result = 0;
485         for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
486                 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
487         result += newp->tm_yday - oldp->tm_yday;
488         result *= HOURSPERDAY;
489         result += newp->tm_hour - oldp->tm_hour;
490         result *= MINSPERHOUR;
491         result += newp->tm_min - oldp->tm_min;
492         result *= SECSPERMIN;
493         result += newp->tm_sec - oldp->tm_sec;
494         return result;
495 }
496
497 static void
498 show(zone, t, v)
499 char *  zone;
500 time_t  t;
501 int     v;
502 {
503         register struct tm *    tmp;
504
505         (void) printf("%-*s  ", (int) longest, zone);
506         if (v) {
507                 tmp = gmtime(&t);
508                 if (tmp == NULL) {
509                         (void) printf(tformat(), t);
510                 } else {
511                         dumptime(tmp);
512                         (void) printf(" UTC");
513                 }
514                 (void) printf(" = ");
515         }
516         tmp = my_localtime(&t);
517         dumptime(tmp);
518         if (tmp != NULL) {
519                 if (*abbr(tmp) != '\0')
520                         (void) printf(" %s", abbr(tmp));
521                 if (v) {
522                         (void) printf(" isdst=%d", tmp->tm_isdst);
523 #ifdef TM_GMTOFF
524                         (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
525 #endif /* defined TM_GMTOFF */
526                 }
527         }
528         (void) printf("\n");
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 (0.5 == (time_t) 0.5) {      /* floating */
553                 if (sizeof (time_t) > sizeof (double))
554                         return "%Lg";
555                 return "%g";
556         }
557         if (0 > (time_t) -1) {          /* signed */
558                 if (sizeof (time_t) > sizeof (long))
559                         return "%lld";
560                 if (sizeof (time_t) > sizeof (int))
561                         return "%ld";
562                 return "%d";
563         }
564         if (sizeof (time_t) > sizeof (unsigned long))
565                 return "%llu";
566         if (sizeof (time_t) > sizeof (unsigned int))
567                 return "%lu";
568         return "%u";
569 }
570
571 static void
572 dumptime(timeptr)
573 register const struct tm *      timeptr;
574 {
575         static const char       wday_name[][3] = {
576                 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
577         };
578         static const char       mon_name[][3] = {
579                 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
580                 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
581         };
582         register const char *   wn;
583         register const char *   mn;
584         register int            lead;
585         register int            trail;
586
587         if (timeptr == NULL) {
588                 (void) printf("NULL");
589                 return;
590         }
591         /*
592         ** The packaged versions of localtime and gmtime never put out-of-range
593         ** values in tm_wday or tm_mon, but since this code might be compiled
594         ** with other (perhaps experimental) versions, paranoia is in order.
595         */
596         if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
597                 (int) (sizeof wday_name / sizeof wday_name[0]))
598                         wn = "???";
599         else            wn = wday_name[timeptr->tm_wday];
600         if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
601                 (int) (sizeof mon_name / sizeof mon_name[0]))
602                         mn = "???";
603         else            mn = mon_name[timeptr->tm_mon];
604         (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
605                 wn, mn,
606                 timeptr->tm_mday, timeptr->tm_hour,
607                 timeptr->tm_min, timeptr->tm_sec);
608 #define DIVISOR 10
609         trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
610         lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
611                 trail / DIVISOR;
612         trail %= DIVISOR;
613         if (trail < 0 && lead > 0) {
614                 trail += DIVISOR;
615                 --lead;
616         } else if (lead < 0 && trail > 0) {
617                 trail -= DIVISOR;
618                 ++lead;
619         }
620         if (lead == 0)
621                 (void) printf("%d", trail);
622         else    (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
623 }