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zdump.c
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1 /*
2 ** This file is in the public domain, so clarified as of
3 ** 2009-05-17 by Arthur David Olson.
4 */
5 
6 #include "version.h"
7 
8 /*
9 ** This code has been made independent of the rest of the time
10 ** conversion package to increase confidence in the verification it provides.
11 ** You can use this code to help in verifying other implementations.
12 **
13 ** However, include private.h when debugging, so that it overrides
14 ** time_t consistently with the rest of the package.
15 */
16 
17 #ifdef time_tz
18 # include "private.h"
19 #endif
20 
21 #include "stdio.h" /* for stdout, stderr, perror */
22 #include "string.h" /* for strcpy */
23 #include "sys/types.h" /* for time_t */
24 #include "time.h" /* for struct tm */
25 #include "stdlib.h" /* for exit, malloc, atoi */
26 #include "limits.h" /* for CHAR_BIT, LLONG_MAX */
27 #include "ctype.h" /* for isalpha et al. */
28 
29 /* Enable extensions and modifications for ICU. */
30 #define ICU
31 
32 #ifdef ICU
33 #include "dirent.h"
34 #include "sys/stat.h"
35 #endif
36 
37 #ifndef isascii
38 #define isascii(x) 1
39 #endif /* !defined isascii */
40 
41 /*
42 ** Substitutes for pre-C99 compilers.
43 ** Much of this section of code is stolen from private.h.
44 */
45 
46 #ifndef HAVE_STDINT_H
47 # define HAVE_STDINT_H \
48  (199901 <= __STDC_VERSION__ || 2 < (__GLIBC__ + (0 < __GLIBC_MINOR__)))
49 #endif
50 #if HAVE_STDINT_H
51 # include "stdint.h"
52 #endif
53 #ifndef HAVE_INTTYPES_H
54 # define HAVE_INTTYPES_H HAVE_STDINT_H
55 #endif
56 #if HAVE_INTTYPES_H
57 # include <inttypes.h>
58 #endif
59 
60 #ifndef INT_FAST32_MAX
61 # if INT_MAX >> 31 == 0
62 typedef long int_fast32_t;
63 # else
64 typedef int int_fast32_t;
65 # endif
66 #endif
67 
68 #ifndef INTMAX_MAX
69 # if defined LLONG_MAX || defined __LONG_LONG_MAX__
70 typedef long long intmax_t;
71 # define strtoimax strtoll
72 # define PRIdMAX "lld"
73 # ifdef LLONG_MAX
74 # define INTMAX_MAX LLONG_MAX
75 # else
76 # define INTMAX_MAX __LONG_LONG_MAX__
77 # endif
78 # else
79 typedef long intmax_t;
80 # define strtoimax strtol
81 # define PRIdMAX "ld"
82 # define INTMAX_MAX LONG_MAX
83 # endif
84 #endif
85 
86 
87 #ifndef ZDUMP_LO_YEAR
88 #define ZDUMP_LO_YEAR (-500)
89 #endif /* !defined ZDUMP_LO_YEAR */
90 
91 #ifndef ZDUMP_HI_YEAR
92 #define ZDUMP_HI_YEAR 2500
93 #endif /* !defined ZDUMP_HI_YEAR */
94 
95 #ifndef MAX_STRING_LENGTH
96 #define MAX_STRING_LENGTH 1024
97 #endif /* !defined MAX_STRING_LENGTH */
98 
99 #ifndef TRUE
100 #define TRUE 1
101 #endif /* !defined TRUE */
102 
103 #ifndef FALSE
104 #define FALSE 0
105 #endif /* !defined FALSE */
106 
107 #ifndef EXIT_SUCCESS
108 #define EXIT_SUCCESS 0
109 #endif /* !defined EXIT_SUCCESS */
110 
111 #ifndef EXIT_FAILURE
112 #define EXIT_FAILURE 1
113 #endif /* !defined EXIT_FAILURE */
114 
115 #ifndef SECSPERMIN
116 #define SECSPERMIN 60
117 #endif /* !defined SECSPERMIN */
118 
119 #ifndef MINSPERHOUR
120 #define MINSPERHOUR 60
121 #endif /* !defined MINSPERHOUR */
122 
123 #ifndef SECSPERHOUR
124 #define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
125 #endif /* !defined SECSPERHOUR */
126 
127 #ifndef HOURSPERDAY
128 #define HOURSPERDAY 24
129 #endif /* !defined HOURSPERDAY */
130 
131 #ifndef EPOCH_YEAR
132 #define EPOCH_YEAR 1970
133 #endif /* !defined EPOCH_YEAR */
134 
135 #ifndef TM_YEAR_BASE
136 #define TM_YEAR_BASE 1900
137 #endif /* !defined TM_YEAR_BASE */
138 
139 #ifndef DAYSPERNYEAR
140 #define DAYSPERNYEAR 365
141 #endif /* !defined DAYSPERNYEAR */
142 
143 #ifndef isleap
144 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
145 #endif /* !defined isleap */
146 
147 #ifndef isleap_sum
148 /*
149 ** See tzfile.h for details on isleap_sum.
150 */
151 #define isleap_sum(a, b) isleap((a) % 400 + (b) % 400)
152 #endif /* !defined isleap_sum */
153 
154 #define SECSPERDAY ((int_fast32_t) SECSPERHOUR * HOURSPERDAY)
155 #define SECSPERNYEAR (SECSPERDAY * DAYSPERNYEAR)
156 #define SECSPERLYEAR (SECSPERNYEAR + SECSPERDAY)
157 #define SECSPER400YEARS (SECSPERNYEAR * (intmax_t) (300 + 3) \
158  + SECSPERLYEAR * (intmax_t) (100 - 3))
159 
160 /*
161 ** True if SECSPER400YEARS is known to be representable as an
162 ** intmax_t. It's OK that SECSPER400YEARS_FITS can in theory be false
163 ** even if SECSPER400YEARS is representable, because when that happens
164 ** the code merely runs a bit more slowly, and this slowness doesn't
165 ** occur on any practical platform.
166 */
167 enum { SECSPER400YEARS_FITS = SECSPERLYEAR <= INTMAX_MAX / 400 };
168 
169 #ifndef HAVE_GETTEXT
170 #define HAVE_GETTEXT 0
171 #endif
172 #if HAVE_GETTEXT
173 #include "locale.h" /* for setlocale */
174 #include "libintl.h"
175 #endif /* HAVE_GETTEXT */
176 
177 #ifndef GNUC_or_lint
178 #ifdef lint
179 #define GNUC_or_lint
180 #else /* !defined lint */
181 #ifdef __GNUC__
182 #define GNUC_or_lint
183 #endif /* defined __GNUC__ */
184 #endif /* !defined lint */
185 #endif /* !defined GNUC_or_lint */
186 
187 #if 2 < __GNUC__ || (__GNUC__ == 2 && 96 <= __GNUC_MINOR__)
188 # define ATTRIBUTE_PURE __attribute__ ((__pure__))
189 #else
190 # define ATTRIBUTE_PURE /* empty */
191 #endif
192 
193 /*
194 ** For the benefit of GNU folk...
195 ** `_(MSGID)' uses the current locale's message library string for MSGID.
196 ** The default is to use gettext if available, and use MSGID otherwise.
197 */
198 
199 #ifndef _
200 #if HAVE_GETTEXT
201 #define _(msgid) gettext(msgid)
202 #else /* !HAVE_GETTEXT */
203 #define _(msgid) msgid
204 #endif /* !HAVE_GETTEXT */
205 #endif /* !defined _ */
206 
207 #ifndef TZ_DOMAIN
208 #define TZ_DOMAIN "tz"
209 #endif /* !defined TZ_DOMAIN */
210 
211 extern char ** environ;
212 extern int getopt(int argc, char * const argv[],
213  const char * options);
214 extern char * optarg;
215 extern int optind;
216 extern char * tzname[2];
217 
218 /* The minimum and maximum finite time values. */
219 static time_t const absolute_min_time =
220  ((time_t) -1 < 0
221  ? (time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1)
222  : 0);
223 static time_t const absolute_max_time =
224  ((time_t) -1 < 0
225  ? - (~ 0 < 0) - ((time_t) -1 << (CHAR_BIT * sizeof (time_t) - 1))
226  : -1);
227 static size_t longest;
228 static char * progname;
229 static int warned;
230 
231 static char * abbr(struct tm * tmp);
232 static void abbrok(const char * abbrp, const char * zone);
233 static intmax_t delta(struct tm * newp, struct tm * oldp) ATTRIBUTE_PURE;
234 static void dumptime(const struct tm * tmp);
235 static time_t hunt(char * name, time_t lot, time_t hit);
236 static void show(char * zone, time_t t, int v);
237 static const char * tformat(void);
239 #ifdef ICU
240 typedef struct listentry {
241  char * name;
242  struct listentry * next;
244 
245 static time_t huntICU(char * name, time_t lot, time_t hit, FILE *fp);
246 static void dumptimeICU(FILE * fp, time_t t);
247 static void showICU(FILE * fp, char * zone, time_t t1, time_t t2);
248 static int getall(struct listentry ** namelist);
249 static void getzones(char * basedir, char * subdir, struct listentry ** last, int * count);
250 #endif
251 
252 #ifndef TYPECHECK
253 #define my_localtime localtime
254 #else /* !defined TYPECHECK */
255 static struct tm *
257 {
258  register struct tm * tmp;
259 
260  tmp = localtime(tp);
261  if (tp != NULL && tmp != NULL) {
262  struct tm tm;
263  register time_t t;
264 
265  tm = *tmp;
266  t = mktime(&tm);
267  if (t != *tp) {
268  (void) fflush(stdout);
269  (void) fprintf(stderr, "\n%s: ", progname);
270  (void) fprintf(stderr, tformat(), *tp);
271  (void) fprintf(stderr, " ->");
272  (void) fprintf(stderr, " year=%d", tmp->tm_year);
273  (void) fprintf(stderr, " mon=%d", tmp->tm_mon);
274  (void) fprintf(stderr, " mday=%d", tmp->tm_mday);
275  (void) fprintf(stderr, " hour=%d", tmp->tm_hour);
276  (void) fprintf(stderr, " min=%d", tmp->tm_min);
277  (void) fprintf(stderr, " sec=%d", tmp->tm_sec);
278  (void) fprintf(stderr, " isdst=%d", tmp->tm_isdst);
279  (void) fprintf(stderr, " -> ");
280  (void) fprintf(stderr, tformat(), t);
281  (void) fprintf(stderr, "\n");
282  }
283  }
284  return tmp;
285 }
286 #endif /* !defined TYPECHECK */
287 
288 static void
289 abbrok(const char *const abbrp, const char *const zone)
290 {
291  register const char * cp;
292  register const char * wp;
293 
294  if (warned)
295  return;
296  cp = abbrp;
297  wp = NULL;
298  while (isascii((unsigned char) *cp) && isalpha((unsigned char) *cp))
299  ++cp;
300  if (cp - abbrp == 0)
301  wp = _("lacks alphabetic at start");
302  else if (cp - abbrp < 3)
303  wp = _("has fewer than 3 alphabetics");
304  else if (cp - abbrp > 6)
305  wp = _("has more than 6 alphabetics");
306  if (wp == NULL && (*cp == '+' || *cp == '-')) {
307  ++cp;
308  if (isascii((unsigned char) *cp) &&
309  isdigit((unsigned char) *cp))
310  if (*cp++ == '1' && *cp >= '0' && *cp <= '4')
311  ++cp;
312  if (*cp != '\0')
313  wp = _("differs from POSIX standard");
314  }
315  if (wp == NULL)
316  return;
317  (void) fflush(stdout);
318  (void) fprintf(stderr,
319  _("%s: warning: zone \"%s\" abbreviation \"%s\" %s\n"),
320  progname, zone, abbrp, wp);
321  warned = TRUE;
322 }
323 
324 static void
325 usage(FILE * const stream, const int status)
326 {
327  (void) fprintf(stream,
328 _("%s: usage: %s [--version] [--help] [-{vV}] [-{ct} [lo,]hi] zonename ...\n"
329  "\n"
330  "Report bugs to %s.\n"),
332  exit(status);
333 }
334 
335 int
336 main(int argc, char *argv[])
337 {
338  register int i;
339  register int vflag;
340  register int Vflag;
341  register char * cutarg;
342  register char * cuttimes;
343  register time_t cutlotime;
344  register time_t cuthitime;
345  register char ** fakeenv;
346  time_t now;
347  time_t t;
348  time_t newt;
349  struct tm tm;
350  struct tm newtm;
351  register struct tm * tmp;
352  register struct tm * newtmp;
353 #ifdef ICU
354  int nextopt;
355  char * dirarg;
356  int aflag;
357  int iflag;
358  listentry * namelist = NULL;
359  FILE * fp = stdout;
360 #endif
361 
362  cutlotime = absolute_min_time;
363  cuthitime = absolute_max_time;
364 #if HAVE_GETTEXT
365  (void) setlocale(LC_ALL, "");
366 #ifdef TZ_DOMAINDIR
367  (void) bindtextdomain(TZ_DOMAIN, TZ_DOMAINDIR);
368 #endif /* defined TEXTDOMAINDIR */
370 #endif /* HAVE_GETTEXT */
371  progname = argv[0];
372  for (i = 1; i < argc; ++i)
373  if (strcmp(argv[i], "--version") == 0) {
374  (void) printf("zdump %s%s\n", PKGVERSION, TZVERSION);
376  } else if (strcmp(argv[i], "--help") == 0) {
378  }
379  vflag = Vflag = 0;
380  cutarg = cuttimes = NULL;
381 #ifdef ICU
382  aflag = 0;
383  iflag = 0;
384  dirarg = NULL;
385  for (;;)
386  switch(getopt(argc, argv, "ac:d:it:vV")) {
387  case 'a': aflag = 1; break;
388  case 'c': cutarg = optarg; break;
389  case 'd': dirarg = optarg; break;
390  case 'i': iflag = 1; break;
391  case 't': cuttimes = optarg; break;
392  case 'v': vflag = 1; break;
393  case 'V': Vflag = 1; break;
394  case -1:
395  if (! (optind == argc - 1 && strcmp(argv[optind], "=") == 0))
396  goto arg_processing_done;
397  /* Fall through. */
398  default:
399  (void) fprintf(stderr,
400  _("%s: usage is %s [ --version ] [ -a ] [ -v ] [ -V ] [ -i ] [ -c [loyear,]hiyear ] [ -t [lotime,]hitime] ][ -d dir ] [ zonename ... ]\n"),
401  progname, progname);
403  }
404 #else
405  for (;;)
406  switch (getopt(argc, argv, "c:t:vV")) {
407  case 'c': cutarg = optarg; break;
408  case 't': cuttimes = optarg; break;
409  case 'v': vflag = 1; break;
410  case 'V': Vflag = 1; break;
411  case -1:
412  if (! (optind == argc - 1 && strcmp(argv[optind], "=") == 0))
413  goto arg_processing_done;
414  /* Fall through. */
415  default:
416  usage(stderr, EXIT_FAILURE);
417  }
418 #endif
419  arg_processing_done:;
420 
421 #ifdef ICU
422  if (dirarg != NULL) {
423  DIR * dp;
424  /* create the output directory */
425  mkdir(dirarg, 0777);
426  if ((dp = opendir(dirarg)) == NULL) {
427  fprintf(stderr, "cannot create the target directory");
429  }
430  closedir(dp);
431  }
432 #endif
433 
434  if (vflag | Vflag) {
435  intmax_t lo;
436  intmax_t hi;
437  char *loend, *hiend;
438  register intmax_t cutloyear = ZDUMP_LO_YEAR;
439  register intmax_t cuthiyear = ZDUMP_HI_YEAR;
440  if (cutarg != NULL) {
441  lo = strtoimax(cutarg, &loend, 10);
442  if (cutarg != loend && !*loend) {
443  hi = lo;
444  cuthiyear = hi;
445  } else if (cutarg != loend && *loend == ','
446  && (hi = strtoimax(loend + 1, &hiend, 10),
447  loend + 1 != hiend && !*hiend)) {
448  cutloyear = lo;
449  cuthiyear = hi;
450  } else {
451 (void) fprintf(stderr, _("%s: wild -c argument %s\n"),
452  progname, cutarg);
454  }
455  }
456  if (cutarg != NULL || cuttimes == NULL) {
457  cutlotime = yeartot(cutloyear);
458  cuthitime = yeartot(cuthiyear);
459  }
460  if (cuttimes != NULL) {
461  lo = strtoimax(cuttimes, &loend, 10);
462  if (cuttimes != loend && !*loend) {
463  hi = lo;
464  if (hi < cuthitime) {
465  if (hi < absolute_min_time)
466  hi = absolute_min_time;
467  cuthitime = hi;
468  }
469  } else if (cuttimes != loend && *loend == ','
470  && (hi = strtoimax(loend + 1, &hiend, 10),
471  loend + 1 != hiend && !*hiend)) {
472  if (cutlotime < lo) {
473  if (absolute_max_time < lo)
474  lo = absolute_max_time;
475  cutlotime = lo;
476  }
477  if (hi < cuthitime) {
478  if (hi < absolute_min_time)
479  hi = absolute_min_time;
480  cuthitime = hi;
481  }
482  } else {
483  (void) fprintf(stderr,
484  _("%s: wild -t argument %s\n"),
485  progname, cuttimes);
487  }
488  }
489  }
490 
491 #ifdef ICU
492  if (aflag) {
493  /* get all available zones */
494  char ** fakeargv;
495  int i;
496  int count;
497 
498  count = getall(&namelist);
499  fakeargv = (char **) malloc((size_t) (argc + count) * sizeof *argv);
500  /*
501  if ((fakeargv = (char **) malloc((size_t) (argc + count) * sizeof *argv)) == NULL) {
502  exit(EXIT_FAILURE);
503  }
504  */
505  for (i = 0; i < argc; i++) {
506  fakeargv[i] = argv[i];
507  }
508  for (i = 0; i < count; i++) {
509  fakeargv[i + argc] = namelist->name;
511  }
512  argv = fakeargv;
513  argc += count;
514  }
515 #endif
516  (void) time(&now);
517  longest = 0;
518  for (i = optind; i < argc; ++i)
519  if (strlen(argv[i]) > longest)
520  longest = strlen(argv[i]);
521  {
522  register int from;
523  register int to;
524 
525  for (i = 0; environ[i] != NULL; ++i)
526  continue;
527  fakeenv = malloc((i + 2) * sizeof *fakeenv);
528  if (fakeenv == NULL
529  || (fakeenv[0] = malloc(longest + 4)) == NULL) {
530  (void) perror(progname);
532  }
533  to = 0;
534  (void) strcpy(fakeenv[to++], "TZ=");
535  for (from = 0; environ[from] != NULL; ++from)
536  if (strncmp(environ[from], "TZ=", 3) != 0)
537  fakeenv[to++] = environ[from];
538  fakeenv[to] = NULL;
539  environ = fakeenv;
540  }
541  for (i = optind; i < argc; ++i) {
542  static char buf[MAX_STRING_LENGTH];
543 
544  (void) strcpy(&fakeenv[0][3], argv[i]);
545  if (! (vflag | Vflag)) {
546  show(argv[i], now, FALSE);
547  continue;
548  }
549 #ifdef ICU
550  fp = NULL;
551  if (iflag) {
552  if (dirarg == NULL) {
553  /* we want to display a zone name here */
554  if (i != optind) {
555  printf("\n");
556  }
557  printf("ZONE: %s\n", argv[i]);
558  } else {
559  int zstart;
560  char path[FILENAME_MAX + 1];
561  strcpy(path, dirarg);
562  strcat(path, "/");
563  zstart = strlen(path);
564  strcat(path, argv[i]);
565  /* replace '/' with '-' */
566  while(path[++zstart] != 0) {
567  if (path[zstart] == '/') {
568  path[zstart] = '-';
569  }
570  }
571  if ((fp = fopen(path, "w")) == NULL) {
572  fprintf(stderr, "cannot create output file %s\n", path);
574  }
575  }
576  }
577 #endif
578  warned = FALSE;
580 #ifdef ICU
581  /* skip displaying info for the lowest time, which is actually not
582  * a transition when -i option is set */
583  if (!iflag) {
584 #endif
585  if (!Vflag) {
586  show(argv[i], t, TRUE);
587  t += SECSPERDAY;
588  show(argv[i], t, TRUE);
589  }
590 #ifdef ICU
591  }
592 #endif
593  if (t < cutlotime)
594  t = cutlotime;
595  tmp = my_localtime(&t);
596  if (tmp != NULL) {
597  tm = *tmp;
598  (void) strncpy(buf, abbr(&tm), (sizeof buf) - 1);
599  }
600  for ( ; ; ) {
601  newt = (t < absolute_max_time - SECSPERDAY / 2
602  ? t + SECSPERDAY / 2
604  if (cuthitime <= newt)
605  break;
606  newtmp = localtime(&newt);
607  if (newtmp != NULL)
608  newtm = *newtmp;
609 #ifdef ICU
610  if (iflag) {
611  /* We do not want to capture transitions just for
612  * abbreviated zone name changes */
613  if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
614  (delta(&newtm, &tm) != (newt - t) ||
615  newtm.tm_isdst != tm.tm_isdst)) {
616  newt = huntICU(argv[i], t, newt, fp);
617  newtmp = localtime(&newt);
618  if (newtmp != NULL) {
619  newtm = *newtmp;
620  (void) strncpy(buf,
621  abbr(&newtm),
622  (sizeof buf) - 1);
623  }
624  }
625  } else {
626 #endif
627  if ((tmp == NULL || newtmp == NULL) ? (tmp != newtmp) :
628  (delta(&newtm, &tm) != (newt - t) ||
629  newtm.tm_isdst != tm.tm_isdst ||
630  strcmp(abbr(&newtm), buf) != 0)) {
631  newt = hunt(argv[i], t, newt);
632  newtmp = localtime(&newt);
633  if (newtmp != NULL) {
634  newtm = *newtmp;
635  (void) strncpy(buf,
636  abbr(&newtm),
637  (sizeof buf) - 1);
638  }
639  }
640 #ifdef ICU
641  }
642 #endif
643  t = newt;
644  tm = newtm;
645  tmp = newtmp;
646  }
647 #ifdef ICU
648  if (!iflag) {
649  /* skip displaying info for the highest time, which is actually not
650  * a transition when -i option is used*/
651 #endif
652  if (!Vflag) {
654  t -= SECSPERDAY;
655  show(argv[i], t, TRUE);
656  t += SECSPERDAY;
657  show(argv[i], t, TRUE);
658  }
659 #ifdef ICU
660  }
661  /* close file */
662  if (fp != NULL) {
663  fclose(fp);
664  }
665 #endif
666  }
667  if (fflush(stdout) || ferror(stdout)) {
668  (void) fprintf(stderr, "%s: ", progname);
669  (void) perror(_("Error writing to standard output"));
671  }
672 #ifdef ICU
673  if (aflag) {
674  struct listentry * entry = namelist;
675  struct listentry * next;
676  while (entry != NULL) {
677  free(entry->name);
678  next = entry->next;
679  free(entry);
680  entry = next;
681  }
682  }
683 #endif
685  /* If exit fails to exit... */
686  return EXIT_FAILURE;
687 }
688 
689 static time_t
691 {
692  register intmax_t myy, seconds, years;
693  register time_t t;
694 
695  myy = EPOCH_YEAR;
696  t = 0;
697  while (myy < y) {
698  if (SECSPER400YEARS_FITS && 400 <= y - myy) {
699  intmax_t diff400 = (y - myy) / 400;
700  if (INTMAX_MAX / SECSPER400YEARS < diff400)
701  return absolute_max_time;
702  seconds = diff400 * SECSPER400YEARS;
703  years = diff400 * 400;
704  } else {
706  years = 1;
707  }
708  myy += years;
709  if (t > absolute_max_time - seconds)
710  return absolute_max_time;
711  t += seconds;
712  }
713  while (y < myy) {
714  if (SECSPER400YEARS_FITS && y + 400 <= myy && myy < 0) {
715  intmax_t diff400 = (myy - y) / 400;
716  if (INTMAX_MAX / SECSPER400YEARS < diff400)
717  return absolute_min_time;
718  seconds = diff400 * SECSPER400YEARS;
719  years = diff400 * 400;
720  } else {
721  seconds = isleap(myy - 1) ? SECSPERLYEAR : SECSPERNYEAR;
722  years = 1;
723  }
724  myy -= years;
725  if (t < absolute_min_time + seconds)
726  return absolute_min_time;
727  t -= seconds;
728  }
729  return t;
730 }
731 
732 static time_t
733 hunt(char *name, time_t lot, time_t hit)
734 {
735  time_t t;
736  struct tm lotm;
737  register struct tm * lotmp;
738  struct tm tm;
739  register struct tm * tmp;
740  char loab[MAX_STRING_LENGTH];
741 
742  lotmp = my_localtime(&lot);
743  if (lotmp != NULL) {
744  lotm = *lotmp;
745  (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
746  }
747  for ( ; ; ) {
748  time_t diff = hit - lot;
749  if (diff < 2)
750  break;
751  t = lot;
752  t += diff / 2;
753  if (t <= lot)
754  ++t;
755  else if (t >= hit)
756  --t;
757  tmp = my_localtime(&t);
758  if (tmp != NULL)
759  tm = *tmp;
760  if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
761  (delta(&tm, &lotm) == (t - lot) &&
762  tm.tm_isdst == lotm.tm_isdst &&
763  strcmp(abbr(&tm), loab) == 0)) {
764  lot = t;
765  lotm = tm;
766  lotmp = tmp;
767  } else hit = t;
768  }
769  show(name, lot, TRUE);
770  show(name, hit, TRUE);
771  return hit;
772 }
773 
774 /*
775 ** Thanks to Paul Eggert for logic used in delta.
776 */
777 
778 static intmax_t
779 delta(struct tm * newp, struct tm *oldp)
780 {
781  register intmax_t result;
782  register int tmy;
783 
784  if (newp->tm_year < oldp->tm_year)
785  return -delta(oldp, newp);
786  result = 0;
787  for (tmy = oldp->tm_year; tmy < newp->tm_year; ++tmy)
789  result += newp->tm_yday - oldp->tm_yday;
790  result *= HOURSPERDAY;
791  result += newp->tm_hour - oldp->tm_hour;
792  result *= MINSPERHOUR;
793  result += newp->tm_min - oldp->tm_min;
794  result *= SECSPERMIN;
795  result += newp->tm_sec - oldp->tm_sec;
796  return result;
797 }
798 
799 static void
800 show(char *zone, time_t t, int v)
801 {
802  register struct tm * tmp;
803 
804  (void) printf("%-*s ", (int) longest, zone);
805  if (v) {
806  tmp = gmtime(&t);
807  if (tmp == NULL) {
808  (void) printf(tformat(), t);
809  } else {
810  dumptime(tmp);
811  (void) printf(" UT");
812  }
813  (void) printf(" = ");
814  }
815  tmp = my_localtime(&t);
816  dumptime(tmp);
817  if (tmp != NULL) {
818  if (*abbr(tmp) != '\0')
819  (void) printf(" %s", abbr(tmp));
820  if (v) {
821  (void) printf(" isdst=%d", tmp->tm_isdst);
822 #ifdef TM_GMTOFF
823  (void) printf(" gmtoff=%ld", tmp->TM_GMTOFF);
824 #endif /* defined TM_GMTOFF */
825  }
826  }
827  (void) printf("\n");
828  if (tmp != NULL && *abbr(tmp) != '\0')
829  abbrok(abbr(tmp), zone);
830 }
831 
832 static char *
833 abbr(struct tm *tmp)
834 {
835  register char * result;
836  static char nada;
837 
838  if (tmp->tm_isdst != 0 && tmp->tm_isdst != 1)
839  return &nada;
840  result = tzname[tmp->tm_isdst];
841  return (result == NULL) ? &nada : result;
842 }
843 
844 /*
845 ** The code below can fail on certain theoretical systems;
846 ** it works on all known real-world systems as of 2004-12-30.
847 */
848 
849 static const char *
850 tformat(void)
851 {
852  if (0 > (time_t) -1) { /* signed */
853  if (sizeof (time_t) == sizeof (intmax_t))
854  return "%"PRIdMAX;
855  if (sizeof (time_t) > sizeof (long))
856  return "%lld";
857  if (sizeof (time_t) > sizeof (int))
858  return "%ld";
859  return "%d";
860  }
861 #ifdef PRIuMAX
862  if (sizeof (time_t) == sizeof (uintmax_t))
863  return "%"PRIuMAX;
864 #endif
865  if (sizeof (time_t) > sizeof (unsigned long))
866  return "%llu";
867  if (sizeof (time_t) > sizeof (unsigned int))
868  return "%lu";
869  return "%u";
870 }
871 
872 static void
873 dumptime(register const struct tm *timeptr)
874 {
875  static const char wday_name[][3] = {
876  "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
877  };
878  static const char mon_name[][3] = {
879  "Jan", "Feb", "Mar", "Apr", "May", "Jun",
880  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
881  };
882  register const char * wn;
883  register const char * mn;
884  register int lead;
885  register int trail;
886 
887  if (timeptr == NULL) {
888  (void) printf("NULL");
889  return;
890  }
891  /*
892  ** The packaged versions of localtime and gmtime never put out-of-range
893  ** values in tm_wday or tm_mon, but since this code might be compiled
894  ** with other (perhaps experimental) versions, paranoia is in order.
895  */
896  if (timeptr->tm_wday < 0 || timeptr->tm_wday >=
897  (int) (sizeof wday_name / sizeof wday_name[0]))
898  wn = "???";
899  else wn = wday_name[timeptr->tm_wday];
900  if (timeptr->tm_mon < 0 || timeptr->tm_mon >=
901  (int) (sizeof mon_name / sizeof mon_name[0]))
902  mn = "???";
903  else mn = mon_name[timeptr->tm_mon];
904  (void) printf("%.3s %.3s%3d %.2d:%.2d:%.2d ",
905  wn, mn,
906  timeptr->tm_mday, timeptr->tm_hour,
907  timeptr->tm_min, timeptr->tm_sec);
908 #define DIVISOR 10
909  trail = timeptr->tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
910  lead = timeptr->tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR +
911  trail / DIVISOR;
912  trail %= DIVISOR;
913  if (trail < 0 && lead > 0) {
914  trail += DIVISOR;
915  --lead;
916  } else if (lead < 0 && trail > 0) {
917  trail -= DIVISOR;
918  ++lead;
919  }
920  if (lead == 0)
921  (void) printf("%d", trail);
922  else (void) printf("%d%d", lead, ((trail < 0) ? -trail : trail));
923 }
924 
925 #ifdef ICU
926 static time_t
927 huntICU(char *name, time_t lot, time_t hit, FILE * fp)
928 {
929  time_t t;
930  long diff;
931  struct tm lotm;
932  register struct tm * lotmp;
933  struct tm tm;
934  register struct tm * tmp;
935  char loab[MAX_STRING_LENGTH];
936 
937  lotmp = my_localtime(&lot);
938  if (lotmp != NULL) {
939  lotm = *lotmp;
940  (void) strncpy(loab, abbr(&lotm), (sizeof loab) - 1);
941  }
942  for ( ; ; ) {
943  diff = (long) (hit - lot);
944  if (diff < 2)
945  break;
946  t = lot;
947  t += diff / 2;
948  if (t <= lot)
949  ++t;
950  else if (t >= hit)
951  --t;
952  tmp = my_localtime(&t);
953  if (tmp != NULL)
954  tm = *tmp;
955  /* We do not want to capture transitions just for
956  * abbreviated zone name changes */
957  if ((lotmp == NULL || tmp == NULL) ? (lotmp == tmp) :
958  (delta(&tm, &lotm) == (t - lot) &&
959  tm.tm_isdst == lotm.tm_isdst)) {
960  lot = t;
961  lotm = tm;
962  lotmp = tmp;
963  } else hit = t;
964  }
965  showICU(fp, name, lot, hit);
966  return hit;
967 }
968 
969 static void showICU(FILE * fp, char *zone, time_t t1, time_t t2)
970 {
971  if (fp == NULL) {
972  fp = stdout;
973  }
974  dumptimeICU(fp, t1);
975  fprintf(fp, " > ");
976  dumptimeICU(fp, t2);
977  fprintf(fp, "\n");
978 }
979 
980 static void dumptimeICU(FILE * fp, time_t t)
981 {
982  static const char wday_name[][3] = {
983  "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
984  };
985  struct tm gmt;
986  struct tm loc;
987  register int lead;
988  register int trail;
989  long offset;
990  long hour, min, sec;
991 
992  loc = *my_localtime(&t);
993 
994  trail = loc.tm_year % DIVISOR + TM_YEAR_BASE % DIVISOR;
995  lead = loc.tm_year / DIVISOR + TM_YEAR_BASE / DIVISOR + trail / DIVISOR;
996  trail %= DIVISOR;
997  if (trail < 0 && lead > 0) {
998  trail += DIVISOR;
999  --lead;
1000  } else if (lead < 0 && trail > 0) {
1001  trail -= DIVISOR;
1002  ++lead;
1003  }
1004 
1005  fprintf(fp, "%04d-%02d-%02d", lead * DIVISOR + trail, loc.tm_mon + 1, loc.tm_mday);
1006  fprintf(fp, " %.3s ", wday_name[loc.tm_wday]);
1007  fprintf(fp, "%02d:%02d:%02d", loc.tm_hour, loc.tm_min, loc.tm_sec);
1008 
1009  gmt = *gmtime(&t);
1010  offset = delta(&loc, &gmt);
1011  if (offset < 0) {
1012  offset = -offset;
1013  fprintf(fp, "-");
1014  } else {
1015  fprintf(fp, "+");
1016  }
1017 
1018  sec = offset % 60;
1019  offset = (offset - sec) / 60;
1020  min = offset % 60;
1021  hour = offset / 60;
1022 
1023  fprintf(fp, "%02ld", hour);
1024  fprintf(fp, "%02ld", min);
1025  fprintf(fp, "%02ld", sec);
1026  fprintf(fp, "[DST=%d]", loc.tm_isdst);
1027 }
1028 
1029 static int getall(struct listentry ** namelist) {
1030  int count = 0;
1031  struct listentry dummyentry;
1032  struct listentry * last = &dummyentry;
1033 
1034  getzones(TZDIR, NULL, &last, &count);
1035  if (count > 0) {
1036  *namelist = dummyentry.next;
1037  }
1038 
1039  return count;
1040 }
1041 
1042 static void getzones(char * basedir, char * relpath, struct listentry ** last, int * count) {
1043  char path[FILENAME_MAX + 1];
1044  struct dirent * dir;
1045  DIR * dp;
1046 
1047  strcpy(path, basedir);
1048  if (relpath != NULL) {
1049  strcat(path, "/");
1050  strcat(path, relpath);
1051  }
1052 
1053  if ((dp = opendir(path)) == NULL) {
1054  /* file */
1055  if (strstr(relpath, ".tab") == NULL && strcmp(relpath, "Etc/Unknown") != 0) {
1056  char * pzonename;
1057  listentry * pentry;
1058 
1059  if ((pzonename = malloc(strlen(relpath) + 1)) == NULL) {
1060  exit(EXIT_FAILURE);
1061  }
1062  strcpy(pzonename, relpath);
1063 
1064  if ((pentry = malloc(sizeof(listentry))) == NULL) {
1065  exit(EXIT_FAILURE);
1066  }
1067 
1068  pentry->name = pzonename;
1069  pentry->next = NULL;
1070  (*last)->next = pentry;
1071  *last = pentry;
1072  (*count)++;
1073  }
1074  } else {
1075  /* directory */
1076  while ((dir = readdir(dp)) != NULL) {
1077  char subpath[FILENAME_MAX + 1];
1078 
1079  if (strcmp(dir->d_name, ".") == 0
1080  || strcmp(dir->d_name, "..") == 0) {
1081  continue;
1082  }
1083  if (relpath != NULL) {
1084  strcpy(subpath, relpath);
1085  strcat(subpath, "/");
1086  strcat(subpath, dir->d_name);
1087  } else {
1088  strcpy(subpath, dir->d_name);
1089  }
1090  getzones(basedir, subpath, last, count);
1091  }
1092  closedir(dp);
1093  }
1094 }
1095 #endif
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