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[kopensolaris-gnu/glibc.git] / timezone / zdump.c
1 static char     elsieid[] = "@(#)zdump.c        7.74";
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 #include "ctype.h"      /* for isalpha et al. */
16 #ifndef isascii
17 #define isascii(x) 1
18 #endif
19
20 #ifndef ZDUMP_LO_YEAR
21 #define ZDUMP_LO_YEAR   (-500)
22 #endif /* !defined ZDUMP_LO_YEAR */
23
24 #ifndef ZDUMP_HI_YEAR
25 #define ZDUMP_HI_YEAR   2500
26 #endif /* !defined ZDUMP_HI_YEAR */
27
28 #ifndef MAX_STRING_LENGTH
29 #define MAX_STRING_LENGTH       1024
30 #endif /* !defined MAX_STRING_LENGTH */
31
32 #ifndef TRUE
33 #define TRUE            1
34 #endif /* !defined TRUE */
35
36 #ifndef FALSE
37 #define FALSE           0
38 #endif /* !defined FALSE */
39
40 #ifndef EXIT_SUCCESS
41 #define EXIT_SUCCESS    0
42 #endif /* !defined EXIT_SUCCESS */
43
44 #ifndef EXIT_FAILURE
45 #define EXIT_FAILURE    1
46 #endif /* !defined EXIT_FAILURE */
47
48 #ifndef SECSPERMIN
49 #define SECSPERMIN      60
50 #endif /* !defined SECSPERMIN */
51
52 #ifndef MINSPERHOUR
53 #define MINSPERHOUR     60
54 #endif /* !defined MINSPERHOUR */
55
56 #ifndef SECSPERHOUR
57 #define SECSPERHOUR     (SECSPERMIN * MINSPERHOUR)
58 #endif /* !defined SECSPERHOUR */
59
60 #ifndef HOURSPERDAY
61 #define HOURSPERDAY     24
62 #endif /* !defined HOURSPERDAY */
63
64 #ifndef EPOCH_YEAR
65 #define EPOCH_YEAR      1970
66 #endif /* !defined EPOCH_YEAR */
67
68 #ifndef TM_YEAR_BASE
69 #define TM_YEAR_BASE    1900
70 #endif /* !defined TM_YEAR_BASE */
71
72 #ifndef DAYSPERNYEAR
73 #define DAYSPERNYEAR    365
74 #endif /* !defined DAYSPERNYEAR */
75
76 #ifndef isleap
77 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
78 #endif /* !defined isleap */
79
80 #ifndef isleap_sum
81 /*
82 ** See tzfile.h for details on isleap_sum.
83 */
84 #define isleap_sum(a, b)        isleap((a) % 400 + (b) % 400)
85 #endif /* !defined isleap_sum */
86
87 #define SECSPERDAY      ((long) SECSPERHOUR * HOURSPERDAY)
88 #define SECSPERNYEAR    (SECSPERDAY * DAYSPERNYEAR)
89 #define SECSPERLYEAR    (SECSPERNYEAR + SECSPERDAY)
90
91 #if HAVE_GETTEXT
92 #include "locale.h"     /* for setlocale */
93 #include "libintl.h"
94 #endif /* HAVE_GETTEXT */
95
96 #ifndef GNUC_or_lint
97 #ifdef lint
98 #define GNUC_or_lint
99 #else /* !defined lint */
100 #ifdef __GNUC__
101 #define GNUC_or_lint
102 #endif /* defined __GNUC__ */
103 #endif /* !defined lint */
104 #endif /* !defined GNUC_or_lint */
105
106 #ifndef INITIALIZE
107 #ifdef GNUC_or_lint
108 #define INITIALIZE(x)   ((x) = 0)
109 #else /* !defined GNUC_or_lint */
110 #define INITIALIZE(x)
111 #endif /* !defined GNUC_or_lint */
112 #endif /* !defined INITIALIZE */
113
114 /*
115 ** For the benefit of GNU folk...
116 ** `_(MSGID)' uses the current locale's message library string for MSGID.
117 ** The default is to use gettext if available, and use MSGID otherwise.
118 */
119
120 #ifndef _
121 #if HAVE_GETTEXT
122 #define _(msgid) gettext(msgid)
123 #else /* !HAVE_GETTEXT */
124 #define _(msgid) msgid
125 #endif /* !HAVE_GETTEXT */
126 #endif /* !defined _ */
127
128 #ifndef TZ_DOMAIN
129 #define TZ_DOMAIN "tz"
130 #endif /* !defined TZ_DOMAIN */
131
132 #ifndef P
133 #ifdef __STDC__
134 #define P(x)    x
135 #else /* !defined __STDC__ */
136 #define P(x)    ()
137 #endif /* !defined __STDC__ */
138 #endif /* !defined P */
139
140 extern char **  environ;
141 extern int      getopt P((int argc, char * const argv[],
142                         const char * options));
143 extern char *   optarg;
144 extern int      optind;
145 extern char *   tzname[2];
146
147 static time_t   absolute_min_time;
148 static time_t   absolute_max_time;
149 static size_t   longest;
150 static char *   progname;
151 static int      warned;
152
153 static char *   abbr P((struct tm * tmp));
154 static void     abbrok P((const char * abbrp, const char * zone));
155 static long     delta P((struct tm * newp, struct tm * oldp));
156 static void     dumptime P((const struct tm * tmp));
157 static time_t   hunt P((char * name, time_t lot, time_t hit));
158 static void     setabsolutes P((void));
159 static void     show P((char * zone, time_t t, int v));
160 static const char *     tformat P((void));
161 static time_t   yeartot P((long y));
162
163 #ifndef TYPECHECK
164 #define my_localtime    localtime
165 #else /* !defined TYPECHECK */
166 static struct tm *
167 my_localtime(tp)
168 time_t *        tp;
169 {
170         register struct tm *    tmp;
171
172         tmp = localtime(tp);
173         if (tp != NULL && tmp != NULL) {
174                 struct tm       tm;
175                 register time_t t;
176
177                 tm = *tmp;
178                 t = mktime(&tm);
179                 if (t - *tp >= 1 || *tp - t >= 1) {
180                         (void) fflush(stdout);
181                         (void) fprintf(stderr, "\n%s: ", progname);
182                         (void) fprintf(stderr, tformat(), *tp);
183                         (void) fprintf(stderr, " ->");
184                         (void) fprintf(stderr, " year=%d", tmp->tm_year);
185                         (void) fprintf(stderr, " mon=%d", tmp->tm_mon);
186                         (void) fprintf(stderr, " mday=%d", tmp->tm_mday);
187                         (void) fprintf(stderr, " hour=%d", tmp->tm_hour);
188                         (void) fprintf(stderr, " min=%d", tmp->tm_min);
189                         (void) fprintf(stderr, " sec=%d", tmp->tm_sec);
190                         (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
191                         (void) fprintf(stderr, " -> ");
192                         (void) fprintf(stderr, tformat(), t);
193                         (void) fprintf(stderr, "\n");
194                 }
195         }
196         return tmp;
197 }
198 #endif /* !defined TYPECHECK */
199
200 static void
201 abbrok(abbrp, zone)
202 const char * const      abbrp;
203 const char * const      zone;
204 {
205         register const char *   cp;
206         register char *         wp;
207
208         if (warned)
209                 return;
210         cp = abbrp;
211         wp = NULL;
212         while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp))
213                 ++cp;
214         if (cp - abbrp == 0)
215                 wp = _("lacks alphabetic at start");
216         else if (cp - abbrp < 3)
217                 wp = _("has fewer than 3 alphabetics");
218         else if (cp - abbrp > 6)
219                 wp = _("has more than 6 alphabetics");
220         if (wp == NULL && (*cp == '+' || *cp == '-')) {
221                 ++cp;
222                 if (isascii((unsigned char) *cp) &&
223                         isdigit((unsigned char) *cp))
224                                 if (*cp++ == '1' && *cp >= '0' && *cp <= '4')
225                                         ++cp;
226                 if (*cp != '\0')
227                         wp = _("differs from POSIX standard");
228         }
229         if (wp == NULL)
230                 return;
231         (void) fflush(stdout);
232         (void) fprintf(stderr,
233                 _("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"),
234                 progname, zone, abbrp, wp);
235         warned = TRUE;
236 }
237
238 int
239 main(argc, argv)
240 int     argc;
241 char *  argv[];
242 {
243         register int            i;
244         register int            c;
245         register int            vflag;
246         register char *         cutarg;
247         register long           cutloyear = ZDUMP_LO_YEAR;
248         register long           cuthiyear = ZDUMP_HI_YEAR;
249         register time_t         cutlotime;
250         register time_t         cuthitime;
251         register char **        fakeenv;
252         time_t                  now;
253         time_t                  t;
254         time_t                  newt;
255         struct tm               tm;
256         struct tm               newtm;
257         register struct tm *    tmp;
258         register struct tm *    newtmp;
259
260         INITIALIZE(cutlotime);
261         INITIALIZE(cuthitime);
262 #if HAVE_GETTEXT
263         (void) setlocale(LC_ALL, "");
264 #ifdef TZ_DOMAINDIR
265         (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
266 #endif /* defined TEXTDOMAINDIR */
267         (void) textdomain(TZ_DOMAIN);
268 #endif /* HAVE_GETTEXT */
269         progname = argv[0];
270         for (i = 1; i < argc; ++i)
271                 if (strcmp(argv[i], "--version") == 0) {
272                         (void) printf("%s\n", elsieid);
273                         exit(EXIT_SUCCESS);
274                 }
275         vflag = 0;
276         cutarg = NULL;
277         while ((c = getopt(argc, argv, "c:v")) == 'c' || c == 'v')
278                 if (c == 'v')
279                         vflag = 1;
280                 else    cutarg = optarg;
281         if ((c != EOF && c != -1) ||
282                 (optind == argc - 1 && strcmp(argv[optind], "=") == 0)) {
283                         (void) fprintf(stderr,
284 _("%s: usage is %s [ --version ] [ -v ] [ -c [loyear,]hiyear ] zonename ...\n"),
285                                 progname, progname);
286                         exit(EXIT_FAILURE);
287         }
288         if (vflag) {
289                 if (cutarg != NULL) {
290                         long    lo;
291                         long    hi;
292                         char    dummy;
293
294                         if (sscanf(cutarg, "%ld%c", &hi, &dummy) == 1) {
295                                 cuthiyear = hi;
296                         } else if (sscanf(cutarg, "%ld,%ld%c",
297                                 &lo, &hi, &dummy) == 2) {
298                                         cutloyear = lo;
299                                         cuthiyear = hi;
300                         } else {
301 (void) fprintf(stderr, _("%s: wild -c argument %s\n"),
302                                         progname, cutarg);
303                                 exit(EXIT_FAILURE);
304                         }
305                 }
306                 setabsolutes();
307                 cutlotime = yeartot(cutloyear);
308                 cuthitime = yeartot(cuthiyear);
309         }
310         (void) time(&now);
311         longest = 0;
312         for (i = optind; i < argc; ++i)
313                 if (strlen(argv[i]) > longest)
314                         longest = strlen(argv[i]);
315         {
316                 register int    from;
317                 register int    to;
318
319                 for (i = 0; environ[i] != NULL; ++i)
320                         continue;
321                 fakeenv = (char **) malloc((size_t) ((i + 2) *
322                         sizeof *fakeenv));
323                 if (fakeenv == NULL ||
324                         (fakeenv[0] = (char *) malloc(longest + 4)) == NULL) {
325                                         (void) perror(progname);
326                                         exit(EXIT_FAILURE);
327                 }
328                 to = 0;
329                 (void) strcpy(fakeenv[to++], "TZ=");
330                 for (from = 0; environ[from] != NULL; ++from)
331                         if (strncmp(environ[from], "TZ=", 3) != 0)
332                                 fakeenv[to++] = environ[from];
333                 fakeenv[to] = NULL;
334                 environ = fakeenv;
335         }
336         for (i = optind; i < argc; ++i) {
337                 static char     buf[MAX_STRING_LENGTH];
338
339                 (void) strcpy(&fakeenv[0][3], argv[i]);
340                 if (!vflag) {
341                         show(argv[i], now, FALSE);
342                         continue;
343                 }
344                 warned = FALSE;
345                 t = absolute_min_time;
346                 show(argv[i], t, TRUE);
347                 t += SECSPERHOUR * HOURSPERDAY;
348                 show(argv[i], t, TRUE);
349                 if (t < cutlotime)
350                         t = cutlotime;
351                 tmp = my_localtime(&t);
352                 if (tmp != NULL) {
353                         tm = *tmp;
354                         (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
355                 }
356                 for ( ; ; ) {
357                         if (t >= cuthitime)
358                                 break;
359                         newt = t + SECSPERHOUR * 12;
360                         if (newt >= cuthitime)
361                                 break;
362                         if (newt <= t)
363                                 break;
364                         newtmp = localtime(&newt);
365                         if (newtmp != NULL)
366                                 newtm = *newtmp;
367                         if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
368                                 (delta(&newtm, &tm) != (newt - t) ||
369                                 newtm.tm_isdst != tm.tm_isdst ||
370                                 strcmp(abbr(&newtm), buf) != 0)) {
371                                         newt = hunt(argv[i], t, newt);
372                                         newtmp = localtime(&newt);
373                                         if (newtmp != NULL) {
374                                                 newtm = *newtmp;
375                                                 (void) strncpy(buf,
376                                                         abbr(&newtm),
377                                                         (sizeof buf) - 1);
378                                         }
379                         }
380                         t = newt;
381                         tm = newtm;
382                         tmp = newtmp;
383                 }
384                 t = absolute_max_time;
385                 t -= SECSPERHOUR * HOURSPERDAY;
386                 show(argv[i], t, TRUE);
387                 t += SECSPERHOUR * HOURSPERDAY;
388                 show(argv[i], t, TRUE);
389         }
390         if (fflush(stdout) || ferror(stdout)) {
391                 (void) fprintf(stderr, "%s: ", progname);
392                 (void) perror(_("Error writing standard output"));
393                 exit(EXIT_FAILURE);
394         }
395         exit(EXIT_SUCCESS);
396         /* If exit fails to exit... */
397         return EXIT_FAILURE;
398 }
399
400 static void
401 setabsolutes()
402 {
403         if (0.5 == (time_t) 0.5) {
404                 /*
405                 ** time_t is floating.
406                 */
407                 if (sizeof (time_t) == sizeof (float)) {
408                         absolute_min_time = (time_t) -FLT_MAX;
409                         absolute_max_time = (time_t) FLT_MAX;
410                 } else if (sizeof (time_t) == sizeof (double)) {
411                         absolute_min_time = (time_t) -DBL_MAX;
412                         absolute_max_time = (time_t) DBL_MAX;
413                 } else {
414                         (void) fprintf(stderr,
415 _("%s: use of -v on system with floating time_t other than float or double\n"),
416                                 progname);
417                         exit(EXIT_FAILURE);
418                 }
419         } else if (0 > (time_t) -1) {
420                 /*
421                 ** time_t is signed.
422                 */
423                 register time_t hibit;
424
425                 for (hibit = 1; (hibit * 2) != 0; hibit *= 2)
426                         continue;
427                 absolute_min_time = hibit;
428                 absolute_max_time = -(hibit + 1);
429         } else {
430                 /*
431                 ** time_t is unsigned.
432                 */
433                 absolute_min_time = 0;
434                 absolute_max_time = absolute_min_time - 1;
435         }
436 }
437
438 static time_t
439 yeartot(y)
440 const long      y;
441 {
442         register long   myy;
443         register long   seconds;
444         register time_t t;
445
446         myy = EPOCH_YEAR;
447         t = 0;
448         while (myy != y) {
449                 if (myy < y) {
450                         seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
451                         ++myy;
452                         if (t > absolute_max_time - seconds) {
453                                 t = absolute_max_time;
454                                 break;
455                         }
456                         t += seconds;
457                 } else {
458                         --myy;
459                         seconds = isleap(myy) ? SECSPERLYEAR : SECSPERNYEAR;
460                         if (t < absolute_min_time + seconds) {
461                                 t = absolute_min_time;
462                                 break;
463                         }
464                         t -= seconds;
465                 }
466         }
467         return t;
468 }
469
470 static time_t
471 hunt(name, lot, hit)
472 char *  name;
473 time_t  lot;
474 time_t  hit;
475 {
476         time_t                  t;
477         long                    diff;
478         struct tm               lotm;
479         register struct tm *    lotmp;
480         struct tm               tm;
481         register struct tm *    tmp;
482         char                    loab[MAX_STRING_LENGTH];
483
484         lotmp = my_localtime(&lot);
485         if (lotmp != NULL) {
486                 lotm = *lotmp;
487                 (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
488         }
489         for ( ; ; ) {
490                 diff = (long) (hit - lot);
491                 if (diff < 2)
492                         break;
493                 t = lot;
494                 t += diff / 2;
495                 if (t <= lot)
496                         ++t;
497                 else if (t >= hit)
498                         --t;
499                 tmp = my_localtime(&t);
500                 if (tmp != NULL)
501                         tm = *tmp;
502                 if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
503                         (delta(&tm, &lotm) == (t - lot) &&
504                         tm.tm_isdst == lotm.tm_isdst &&
505                         strcmp(abbr(&tm), loab) == 0)) {
506                                 lot = t;
507                                 lotm = tm;
508                                 lotmp = tmp;
509                 } else  hit = t;
510         }
511         show(name, lot, TRUE);
512         show(name, hit, TRUE);
513         return hit;
514 }
515
516 /*
517 ** Thanks to Paul Eggert for logic used in delta.
518 */
519
520 static long
521 delta(newp, oldp)
522 struct tm *     newp;
523 struct tm *     oldp;
524 {
525         register long   result;
526         register int    tmy;
527
528         if (newp->tm_year < oldp->tm_year)
529                 return -delta(oldp, newp);
530         result = 0;
531         for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
532                 result += DAYSPERNYEAR + isleap_sum(tmy, TM_YEAR_BASE);
533         result += newp->tm_yday - oldp->tm_yday;
534         result *= HOURSPERDAY;
535         result += newp->tm_hour - oldp->tm_hour;
536         result *= MINSPERHOUR;
537         result += newp->tm_min - oldp->tm_min;
538         result *= SECSPERMIN;
539         result += newp->tm_sec - oldp->tm_sec;
540         return result;
541 }
542
543 static void
544 show(zone, t, v)
545 char *  zone;
546 time_t  t;
547 int     v;
548 {
549         register struct tm *    tmp;
550
551         (void) printf("%-*s  ", (int) longest, zone);
552         if (v) {
553                 tmp = gmtime(&t);
554                 if (tmp == NULL) {
555                         (void) printf(tformat(), t);
556                 } else {
557                         dumptime(tmp);
558                         (void) printf(" UTC");
559                 }
560                 (void) printf(" = ");
561         }
562         tmp = my_localtime(&t);
563         dumptime(tmp);
564         if (tmp != NULL) {
565                 if (*abbr(tmp) != '\0')
566                         (void) printf(" %s", abbr(tmp));
567                 if (v) {
568                         (void) printf(" isdst=%d", tmp->tm_isdst);
569 #ifdef TM_GMTOFF
570                         (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
571 #endif /* defined TM_GMTOFF */
572                 }
573         }
574         (void) printf("\n");
575         if (tmp != NULL && *abbr(tmp) != '\0')
576                 abbrok(abbr(tmp), zone);
577 }
578
579 static char *
580 abbr(tmp)
581 struct tm *     tmp;
582 {
583         register char * result;
584         static char     nada;
585
586         if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
587                 return &nada;
588         result = tzname[tmp->tm_isdst];
589         return (result == NULL) ? &nada : result;
590 }
591
592 /*
593 ** The code below can fail on certain theoretical systems;
594 ** it works on all known real-world systems as of 2004-12-30.
595 */
596
597 static const char *
598 tformat()
599 {
600         if (0.5 == (time_t) 0.5) {      /* floating */
601                 if (sizeof (time_t) > sizeof (double))
602                         return "%Lg";
603                 return "%g";
604         }
605         if (0 > (time_t) -1) {          /* signed */
606                 if (sizeof (time_t) > sizeof (long))
607                         return "%lld";
608                 if (sizeof (time_t) > sizeof (int))
609                         return "%ld";
610                 return "%d";
611         }
612         if (sizeof (time_t) > sizeof (unsigned long))
613                 return "%llu";
614         if (sizeof (time_t) > sizeof (unsigned int))
615                 return "%lu";
616         return "%u";
617 }
618
619 static void
620 dumptime(timeptr)
621 register const struct tm *      timeptr;
622 {
623         static const char       wday_name[][3] = {
624                 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
625         };
626         static const char       mon_name[][3] = {
627                 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
628                 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
629         };
630         register const char *   wn;
631         register const char *   mn;
632         register int            lead;
633         register int            trail;
634
635         if (timeptr == NULL) {
636                 (void) printf("NULL");
637                 return;
638         }
639         /*
640         ** The packaged versions of localtime and gmtime never put out-of-range
641         ** values in tm_wday or tm_mon, but since this code might be compiled
642         ** with other (perhaps experimental) versions, paranoia is in order.
643         */
644         if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
645                 (int) (sizeof wday_name / sizeof wday_name[0]))
646                         wn = "???";
647         else            wn = wday_name[timeptr->tm_wday];
648         if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
649                 (int) (sizeof mon_name / sizeof mon_name[0]))
650                         mn = "???";
651         else            mn = mon_name[timeptr->tm_mon];
652         (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
653                 wn, mn,
654                 timeptr->tm_mday, timeptr->tm_hour,
655                 timeptr->tm_min, timeptr->tm_sec);
656 #define DIVISOR 10
657         trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
658         lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
659                 trail / DIVISOR;
660         trail %= DIVISOR;
661         if (trail < 0 && lead > 0) {
662                 trail += DIVISOR;
663                 --lead;
664         } else if (lead < 0 && trail > 0) {
665                 trail -= DIVISOR;
666                 ++lead;
667         }
668         if (lead == 0)
669                 (void) printf("%d", trail);
670         else    (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
671 }