1 | /* Copyright (C) 1991-2017 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <ctype.h> |
19 | #include <errno.h> |
20 | #include <libc-lock.h> |
21 | #include <stdbool.h> |
22 | #include <stddef.h> |
23 | #include <stdio.h> |
24 | #include <stdlib.h> |
25 | #include <string.h> |
26 | #include <time.h> |
27 | |
28 | |
29 | #define NOID |
30 | #include <timezone/tzfile.h> |
31 | |
32 | char *__tzname[2] = { (char *) "GMT" , (char *) "GMT" }; |
33 | int __daylight = 0; |
34 | long int __timezone = 0L; |
35 | |
36 | weak_alias (__tzname, tzname) |
37 | weak_alias (__daylight, daylight) |
38 | weak_alias (__timezone, timezone) |
39 | |
40 | /* This locks all the state variables in tzfile.c and this file. */ |
41 | __libc_lock_define_initialized (static, tzset_lock) |
42 | |
43 | |
44 | #define min(a, b) ((a) < (b) ? (a) : (b)) |
45 | #define max(a, b) ((a) > (b) ? (a) : (b)) |
46 | #define sign(x) ((x) < 0 ? -1 : 1) |
47 | |
48 | |
49 | /* This structure contains all the information about a |
50 | timezone given in the POSIX standard TZ envariable. */ |
51 | typedef struct |
52 | { |
53 | const char *name; |
54 | |
55 | /* When to change. */ |
56 | enum { J0, J1, M } type; /* Interpretation of: */ |
57 | unsigned short int m, n, d; /* Month, week, day. */ |
58 | int secs; /* Time of day. */ |
59 | |
60 | long int offset; /* Seconds east of GMT (west if < 0). */ |
61 | |
62 | /* We cache the computed time of change for a |
63 | given year so we don't have to recompute it. */ |
64 | time_t change; /* When to change to this zone. */ |
65 | int computed_for; /* Year above is computed for. */ |
66 | } tz_rule; |
67 | |
68 | /* tz_rules[0] is standard, tz_rules[1] is daylight. */ |
69 | static tz_rule tz_rules[2]; |
70 | |
71 | |
72 | static void compute_change (tz_rule *rule, int year) __THROW internal_function; |
73 | static void tzset_internal (int always, int explicit) |
74 | __THROW internal_function; |
75 | |
76 | /* List of buffers containing time zone strings. */ |
77 | struct tzstring_l |
78 | { |
79 | struct tzstring_l *next; |
80 | size_t len; /* strlen(data) - doesn't count terminating NUL! */ |
81 | char data[0]; |
82 | }; |
83 | |
84 | static struct tzstring_l *tzstring_list; |
85 | |
86 | /* Allocate a permanent home for the first LEN characters of S. It |
87 | will never be moved or deallocated, but may share space with other |
88 | strings. Don't modify the returned string. */ |
89 | static char * |
90 | __tzstring_len (const char *s, size_t len) |
91 | { |
92 | char *p; |
93 | struct tzstring_l *t, *u, *new; |
94 | |
95 | /* Walk the list and look for a match. If this string is the same |
96 | as the end of an already-allocated string, it can share space. */ |
97 | for (u = t = tzstring_list; t; u = t, t = t->next) |
98 | if (len <= t->len) |
99 | { |
100 | p = &t->data[t->len - len]; |
101 | if (memcmp (s, p, len) == 0) |
102 | return p; |
103 | } |
104 | |
105 | /* Not found; allocate a new buffer. */ |
106 | new = malloc (sizeof (struct tzstring_l) + len + 1); |
107 | if (!new) |
108 | return NULL; |
109 | |
110 | new->next = NULL; |
111 | new->len = len; |
112 | memcpy (new->data, s, len); |
113 | new->data[len] = '\0'; |
114 | |
115 | if (u) |
116 | u->next = new; |
117 | else |
118 | tzstring_list = new; |
119 | |
120 | return new->data; |
121 | } |
122 | |
123 | /* Allocate a permanent home for S. It will never be moved or |
124 | deallocated, but may share space with other strings. Don't modify |
125 | the returned string. */ |
126 | char * |
127 | __tzstring (const char *s) |
128 | { |
129 | return __tzstring_len (s, strlen (s)); |
130 | } |
131 | |
132 | /* Maximum length of a timezone name. tzset_internal keeps this up to date |
133 | (never decreasing it) when ! __use_tzfile. |
134 | tzfile.c keeps it up to date when __use_tzfile. */ |
135 | size_t __tzname_cur_max; |
136 | |
137 | long int |
138 | __tzname_max (void) |
139 | { |
140 | __libc_lock_lock (tzset_lock); |
141 | |
142 | tzset_internal (0, 0); |
143 | |
144 | __libc_lock_unlock (tzset_lock); |
145 | |
146 | return __tzname_cur_max; |
147 | } |
148 | |
149 | static char *old_tz; |
150 | |
151 | static void |
152 | internal_function |
153 | update_vars (void) |
154 | { |
155 | __daylight = tz_rules[0].offset != tz_rules[1].offset; |
156 | __timezone = -tz_rules[0].offset; |
157 | __tzname[0] = (char *) tz_rules[0].name; |
158 | __tzname[1] = (char *) tz_rules[1].name; |
159 | |
160 | /* Keep __tzname_cur_max up to date. */ |
161 | size_t len0 = strlen (__tzname[0]); |
162 | size_t len1 = strlen (__tzname[1]); |
163 | if (len0 > __tzname_cur_max) |
164 | __tzname_cur_max = len0; |
165 | if (len1 > __tzname_cur_max) |
166 | __tzname_cur_max = len1; |
167 | } |
168 | |
169 | |
170 | static unsigned int |
171 | __attribute_noinline__ |
172 | compute_offset (unsigned int ss, unsigned int mm, unsigned int hh) |
173 | { |
174 | return min (ss, 59) + min (mm, 59) * 60 + min (hh, 24) * 60 * 60; |
175 | } |
176 | |
177 | /* Parses the time zone name at *TZP, and writes a pointer to an |
178 | interned string to tz_rules[WHICHRULE].name. On success, advances |
179 | *TZP, and returns true. Returns false otherwise. */ |
180 | static bool |
181 | parse_tzname (const char **tzp, int whichrule) |
182 | { |
183 | const char *start = *tzp; |
184 | const char *p = start; |
185 | while (('a' <= *p && *p <= 'z') |
186 | || ('A' <= *p && *p <= 'Z')) |
187 | ++p; |
188 | size_t len = p - start; |
189 | if (len < 3) |
190 | { |
191 | p = *tzp; |
192 | if (__glibc_unlikely (*p++ != '<')) |
193 | return false; |
194 | start = p; |
195 | while (('a' <= *p && *p <= 'z') |
196 | || ('A' <= *p && *p <= 'Z') |
197 | || ('0' <= *p && *p <= '9') |
198 | || *p == '+' || *p == '-') |
199 | ++p; |
200 | len = p - start; |
201 | if (*p++ != '>' || len < 3) |
202 | return false; |
203 | } |
204 | |
205 | const char *name = __tzstring_len (start, len); |
206 | if (name == NULL) |
207 | return false; |
208 | tz_rules[whichrule].name = name; |
209 | |
210 | *tzp = p; |
211 | return true; |
212 | } |
213 | |
214 | /* Parses the time zone offset at *TZP, and writes it to |
215 | tz_rules[WHICHRULE].offset. Returns true if the parse was |
216 | successful. */ |
217 | static bool |
218 | parse_offset (const char **tzp, int whichrule) |
219 | { |
220 | const char *tz = *tzp; |
221 | if (whichrule == 0 |
222 | && (*tz == '\0' || (*tz != '+' && *tz != '-' && !isdigit (*tz)))) |
223 | return false; |
224 | |
225 | long sign; |
226 | if (*tz == '-' || *tz == '+') |
227 | sign = *tz++ == '-' ? 1L : -1L; |
228 | else |
229 | sign = -1L; |
230 | *tzp = tz; |
231 | |
232 | unsigned short int hh; |
233 | unsigned short mm = 0; |
234 | unsigned short ss = 0; |
235 | int consumed = 0; |
236 | if (sscanf (tz, "%hu%n:%hu%n:%hu%n" , |
237 | &hh, &consumed, &mm, &consumed, &ss, &consumed) > 0) |
238 | tz_rules[whichrule].offset = sign * compute_offset (ss, mm, hh); |
239 | else |
240 | /* Nothing could be parsed. */ |
241 | if (whichrule == 0) |
242 | { |
243 | /* Standard time defaults to offset zero. */ |
244 | tz_rules[0].offset = 0; |
245 | return false; |
246 | } |
247 | else |
248 | /* DST defaults to one hour later than standard time. */ |
249 | tz_rules[1].offset = tz_rules[0].offset + (60 * 60); |
250 | *tzp = tz + consumed; |
251 | return true; |
252 | } |
253 | |
254 | /* Parses the standard <-> DST rules at *TZP. Updates |
255 | tz_rule[WHICHRULE]. On success, advances *TZP and returns true. |
256 | Otherwise, returns false. */ |
257 | static bool |
258 | parse_rule (const char **tzp, int whichrule) |
259 | { |
260 | const char *tz = *tzp; |
261 | tz_rule *tzr = &tz_rules[whichrule]; |
262 | |
263 | /* Ignore comma to support string following the incorrect |
264 | specification in early POSIX.1 printings. */ |
265 | tz += *tz == ','; |
266 | |
267 | /* Get the date of the change. */ |
268 | if (*tz == 'J' || isdigit (*tz)) |
269 | { |
270 | char *end; |
271 | tzr->type = *tz == 'J' ? J1 : J0; |
272 | if (tzr->type == J1 && !isdigit (*++tz)) |
273 | return false; |
274 | unsigned long int d = strtoul (tz, &end, 10); |
275 | if (end == tz || d > 365) |
276 | return false; |
277 | if (tzr->type == J1 && d == 0) |
278 | return false; |
279 | tzr->d = d; |
280 | tz = end; |
281 | } |
282 | else if (*tz == 'M') |
283 | { |
284 | tzr->type = M; |
285 | int consumed; |
286 | if (sscanf (tz, "M%hu.%hu.%hu%n" , |
287 | &tzr->m, &tzr->n, &tzr->d, &consumed) != 3 |
288 | || tzr->m < 1 || tzr->m > 12 |
289 | || tzr->n < 1 || tzr->n > 5 || tzr->d > 6) |
290 | return false; |
291 | tz += consumed; |
292 | } |
293 | else if (*tz == '\0') |
294 | { |
295 | /* Daylight time rules in the U.S. are defined in the U.S. Code, |
296 | Title 15, Chapter 6, Subchapter IX - Standard Time. These |
297 | dates were established by Congress in the Energy Policy Act |
298 | of 2005 [Pub. L. no. 109-58, 119 Stat 594 (2005)]. |
299 | Below is the equivalent of "M3.2.0,M11.1.0" [/2 not needed |
300 | since 2:00AM is the default]. */ |
301 | tzr->type = M; |
302 | if (tzr == &tz_rules[0]) |
303 | { |
304 | tzr->m = 3; |
305 | tzr->n = 2; |
306 | tzr->d = 0; |
307 | } |
308 | else |
309 | { |
310 | tzr->m = 11; |
311 | tzr->n = 1; |
312 | tzr->d = 0; |
313 | } |
314 | } |
315 | else |
316 | return false; |
317 | |
318 | if (*tz != '\0' && *tz != '/' && *tz != ',') |
319 | return false; |
320 | else if (*tz == '/') |
321 | { |
322 | /* Get the time of day of the change. */ |
323 | int negative; |
324 | ++tz; |
325 | if (*tz == '\0') |
326 | return false; |
327 | negative = *tz == '-'; |
328 | tz += negative; |
329 | /* Default to 2:00 AM. */ |
330 | unsigned short hh = 2; |
331 | unsigned short mm = 0; |
332 | unsigned short ss = 0; |
333 | int consumed = 0; |
334 | sscanf (tz, "%hu%n:%hu%n:%hu%n" , |
335 | &hh, &consumed, &mm, &consumed, &ss, &consumed);; |
336 | tz += consumed; |
337 | tzr->secs = (negative ? -1 : 1) * ((hh * 60 * 60) + (mm * 60) + ss); |
338 | } |
339 | else |
340 | /* Default to 2:00 AM. */ |
341 | tzr->secs = 2 * 60 * 60; |
342 | |
343 | tzr->computed_for = -1; |
344 | *tzp = tz; |
345 | return true; |
346 | } |
347 | |
348 | /* Parse the POSIX TZ-style string. */ |
349 | void |
350 | __tzset_parse_tz (const char *tz) |
351 | { |
352 | /* Clear out old state and reset to unnamed UTC. */ |
353 | memset (tz_rules, '\0', sizeof tz_rules); |
354 | tz_rules[0].name = tz_rules[1].name = "" ; |
355 | |
356 | /* Get the standard timezone name. */ |
357 | if (parse_tzname (&tz, 0) && parse_offset (&tz, 0)) |
358 | { |
359 | /* Get the DST timezone name (if any). */ |
360 | if (*tz != '\0') |
361 | { |
362 | if (parse_tzname (&tz, 1)) |
363 | { |
364 | parse_offset (&tz, 1); |
365 | if (*tz == '\0' || (tz[0] == ',' && tz[1] == '\0')) |
366 | { |
367 | /* There is no rule. See if there is a default rule |
368 | file. */ |
369 | __tzfile_default (tz_rules[0].name, tz_rules[1].name, |
370 | tz_rules[0].offset, tz_rules[1].offset); |
371 | if (__use_tzfile) |
372 | { |
373 | free (old_tz); |
374 | old_tz = NULL; |
375 | return; |
376 | } |
377 | } |
378 | } |
379 | /* Figure out the standard <-> DST rules. */ |
380 | if (parse_rule (&tz, 0)) |
381 | parse_rule (&tz, 1); |
382 | } |
383 | else |
384 | { |
385 | /* There is no DST. */ |
386 | tz_rules[1].name = tz_rules[0].name; |
387 | tz_rules[1].offset = tz_rules[0].offset; |
388 | } |
389 | } |
390 | |
391 | update_vars (); |
392 | } |
393 | |
394 | /* Interpret the TZ envariable. */ |
395 | static void |
396 | internal_function |
397 | tzset_internal (int always, int explicit) |
398 | { |
399 | static int is_initialized; |
400 | const char *tz; |
401 | |
402 | if (is_initialized && !always) |
403 | return; |
404 | is_initialized = 1; |
405 | |
406 | /* Examine the TZ environment variable. */ |
407 | tz = getenv ("TZ" ); |
408 | if (tz == NULL && !explicit) |
409 | /* Use the site-wide default. This is a file name which means we |
410 | would not see changes to the file if we compare only the file |
411 | name for change. We want to notice file changes if tzset() has |
412 | been called explicitly. Leave TZ as NULL in this case. */ |
413 | tz = TZDEFAULT; |
414 | if (tz && *tz == '\0') |
415 | /* User specified the empty string; use UTC explicitly. */ |
416 | tz = "Universal" ; |
417 | |
418 | /* A leading colon means "implementation defined syntax". |
419 | We ignore the colon and always use the same algorithm: |
420 | try a data file, and if none exists parse the 1003.1 syntax. */ |
421 | if (tz && *tz == ':') |
422 | ++tz; |
423 | |
424 | /* Check whether the value changed since the last run. */ |
425 | if (old_tz != NULL && tz != NULL && strcmp (tz, old_tz) == 0) |
426 | /* No change, simply return. */ |
427 | return; |
428 | |
429 | if (tz == NULL) |
430 | /* No user specification; use the site-wide default. */ |
431 | tz = TZDEFAULT; |
432 | |
433 | tz_rules[0].name = NULL; |
434 | tz_rules[1].name = NULL; |
435 | |
436 | /* Save the value of `tz'. */ |
437 | free (old_tz); |
438 | old_tz = tz ? __strdup (tz) : NULL; |
439 | |
440 | /* Try to read a data file. */ |
441 | __tzfile_read (tz, 0, NULL); |
442 | if (__use_tzfile) |
443 | return; |
444 | |
445 | /* No data file found. Default to UTC if nothing specified. */ |
446 | |
447 | if (tz == NULL || *tz == '\0' |
448 | || (TZDEFAULT != NULL && strcmp (tz, TZDEFAULT) == 0)) |
449 | { |
450 | memset (tz_rules, '\0', sizeof tz_rules); |
451 | tz_rules[0].name = tz_rules[1].name = "UTC" ; |
452 | if (J0 != 0) |
453 | tz_rules[0].type = tz_rules[1].type = J0; |
454 | tz_rules[0].change = tz_rules[1].change = (time_t) -1; |
455 | update_vars (); |
456 | return; |
457 | } |
458 | |
459 | __tzset_parse_tz (tz); |
460 | } |
461 | |
462 | /* Figure out the exact time (as a time_t) in YEAR |
463 | when the change described by RULE will occur and |
464 | put it in RULE->change, saving YEAR in RULE->computed_for. */ |
465 | static void |
466 | internal_function |
467 | compute_change (tz_rule *rule, int year) |
468 | { |
469 | time_t t; |
470 | |
471 | if (year != -1 && rule->computed_for == year) |
472 | /* Operations on times in 2 BC will be slower. Oh well. */ |
473 | return; |
474 | |
475 | /* First set T to January 1st, 0:00:00 GMT in YEAR. */ |
476 | if (year > 1970) |
477 | t = ((year - 1970) * 365 |
478 | + /* Compute the number of leapdays between 1970 and YEAR |
479 | (exclusive). There is a leapday every 4th year ... */ |
480 | + ((year - 1) / 4 - 1970 / 4) |
481 | /* ... except every 100th year ... */ |
482 | - ((year - 1) / 100 - 1970 / 100) |
483 | /* ... but still every 400th year. */ |
484 | + ((year - 1) / 400 - 1970 / 400)) * SECSPERDAY; |
485 | else |
486 | t = 0; |
487 | |
488 | switch (rule->type) |
489 | { |
490 | case J1: |
491 | /* Jn - Julian day, 1 == January 1, 60 == March 1 even in leap years. |
492 | In non-leap years, or if the day number is 59 or less, just |
493 | add SECSPERDAY times the day number-1 to the time of |
494 | January 1, midnight, to get the day. */ |
495 | t += (rule->d - 1) * SECSPERDAY; |
496 | if (rule->d >= 60 && __isleap (year)) |
497 | t += SECSPERDAY; |
498 | break; |
499 | |
500 | case J0: |
501 | /* n - Day of year. |
502 | Just add SECSPERDAY times the day number to the time of Jan 1st. */ |
503 | t += rule->d * SECSPERDAY; |
504 | break; |
505 | |
506 | case M: |
507 | /* Mm.n.d - Nth "Dth day" of month M. */ |
508 | { |
509 | unsigned int i; |
510 | int d, m1, yy0, yy1, yy2, dow; |
511 | const unsigned short int *myday = |
512 | &__mon_yday[__isleap (year)][rule->m]; |
513 | |
514 | /* First add SECSPERDAY for each day in months before M. */ |
515 | t += myday[-1] * SECSPERDAY; |
516 | |
517 | /* Use Zeller's Congruence to get day-of-week of first day of month. */ |
518 | m1 = (rule->m + 9) % 12 + 1; |
519 | yy0 = (rule->m <= 2) ? (year - 1) : year; |
520 | yy1 = yy0 / 100; |
521 | yy2 = yy0 % 100; |
522 | dow = ((26 * m1 - 2) / 10 + 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; |
523 | if (dow < 0) |
524 | dow += 7; |
525 | |
526 | /* DOW is the day-of-week of the first day of the month. Get the |
527 | day-of-month (zero-origin) of the first DOW day of the month. */ |
528 | d = rule->d - dow; |
529 | if (d < 0) |
530 | d += 7; |
531 | for (i = 1; i < rule->n; ++i) |
532 | { |
533 | if (d + 7 >= (int) myday[0] - myday[-1]) |
534 | break; |
535 | d += 7; |
536 | } |
537 | |
538 | /* D is the day-of-month (zero-origin) of the day we want. */ |
539 | t += d * SECSPERDAY; |
540 | } |
541 | break; |
542 | } |
543 | |
544 | /* T is now the Epoch-relative time of 0:00:00 GMT on the day we want. |
545 | Just add the time of day and local offset from GMT, and we're done. */ |
546 | |
547 | rule->change = t - rule->offset + rule->secs; |
548 | rule->computed_for = year; |
549 | } |
550 | |
551 | |
552 | /* Figure out the correct timezone for TM and set `__tzname', |
553 | `__timezone', and `__daylight' accordingly. */ |
554 | void |
555 | internal_function |
556 | __tz_compute (time_t timer, struct tm *tm, int use_localtime) |
557 | { |
558 | compute_change (&tz_rules[0], 1900 + tm->tm_year); |
559 | compute_change (&tz_rules[1], 1900 + tm->tm_year); |
560 | |
561 | if (use_localtime) |
562 | { |
563 | int isdst; |
564 | |
565 | /* We have to distinguish between northern and southern |
566 | hemisphere. For the latter the daylight saving time |
567 | ends in the next year. */ |
568 | if (__builtin_expect (tz_rules[0].change |
569 | > tz_rules[1].change, 0)) |
570 | isdst = (timer < tz_rules[1].change |
571 | || timer >= tz_rules[0].change); |
572 | else |
573 | isdst = (timer >= tz_rules[0].change |
574 | && timer < tz_rules[1].change); |
575 | tm->tm_isdst = isdst; |
576 | tm->tm_zone = __tzname[isdst]; |
577 | tm->tm_gmtoff = tz_rules[isdst].offset; |
578 | } |
579 | } |
580 | |
581 | /* Reinterpret the TZ environment variable and set `tzname'. */ |
582 | #undef tzset |
583 | |
584 | void |
585 | __tzset (void) |
586 | { |
587 | __libc_lock_lock (tzset_lock); |
588 | |
589 | tzset_internal (1, 1); |
590 | |
591 | if (!__use_tzfile) |
592 | { |
593 | /* Set `tzname'. */ |
594 | __tzname[0] = (char *) tz_rules[0].name; |
595 | __tzname[1] = (char *) tz_rules[1].name; |
596 | } |
597 | |
598 | __libc_lock_unlock (tzset_lock); |
599 | } |
600 | weak_alias (__tzset, tzset) |
601 | |
602 | /* Return the `struct tm' representation of *TIMER in the local timezone. |
603 | Use local time if USE_LOCALTIME is nonzero, UTC otherwise. */ |
604 | struct tm * |
605 | __tz_convert (const time_t *timer, int use_localtime, struct tm *tp) |
606 | { |
607 | long int leap_correction; |
608 | int ; |
609 | |
610 | if (timer == NULL) |
611 | { |
612 | __set_errno (EINVAL); |
613 | return NULL; |
614 | } |
615 | |
616 | __libc_lock_lock (tzset_lock); |
617 | |
618 | /* Update internal database according to current TZ setting. |
619 | POSIX.1 8.3.7.2 says that localtime_r is not required to set tzname. |
620 | This is a good idea since this allows at least a bit more parallelism. */ |
621 | tzset_internal (tp == &_tmbuf && use_localtime, 1); |
622 | |
623 | if (__use_tzfile) |
624 | __tzfile_compute (*timer, use_localtime, &leap_correction, |
625 | &leap_extra_secs, tp); |
626 | else |
627 | { |
628 | if (! __offtime (timer, 0, tp)) |
629 | tp = NULL; |
630 | else |
631 | __tz_compute (*timer, tp, use_localtime); |
632 | leap_correction = 0L; |
633 | leap_extra_secs = 0; |
634 | } |
635 | |
636 | __libc_lock_unlock (tzset_lock); |
637 | |
638 | if (tp) |
639 | { |
640 | if (! use_localtime) |
641 | { |
642 | tp->tm_isdst = 0; |
643 | tp->tm_zone = "GMT" ; |
644 | tp->tm_gmtoff = 0L; |
645 | } |
646 | |
647 | if (__offtime (timer, tp->tm_gmtoff - leap_correction, tp)) |
648 | tp->tm_sec += leap_extra_secs; |
649 | else |
650 | tp = NULL; |
651 | } |
652 | |
653 | return tp; |
654 | } |
655 | |
656 | |
657 | libc_freeres_fn (free_mem) |
658 | { |
659 | while (tzstring_list != NULL) |
660 | { |
661 | struct tzstring_l *old = tzstring_list; |
662 | |
663 | tzstring_list = tzstring_list->next; |
664 | free (old); |
665 | } |
666 | free (old_tz); |
667 | old_tz = NULL; |
668 | } |
669 | |