2 ** This file is in the public domain, so clarified as of
3 ** 1996-06-05 by Arthur David Olson.
5 ** @(#)localtime.c 8.13
6 ** $FreeBSD: src/lib/libc/stdtime/localtime.c,v 1.25.2.2 2002/08/13 16:08:07 bmilekic Exp $
10 ** Leap second handling from Bradley White.
11 ** POSIX-style TZ environment variable handling from Guy Harris.
16 #include "namespace.h"
17 #include <sys/types.h>
21 #include <float.h> /* for FLT_MAX and DBL_MAX */
25 #include <un-namespace.h>
29 #include "libc_private.h"
31 #define _MUTEX_LOCK(x) if (__isthreaded) _pthread_mutex_lock(x)
32 #define _MUTEX_UNLOCK(x) if (__isthreaded) _pthread_mutex_unlock(x)
34 #define _RWLOCK_RDLOCK(x) \
36 if (__isthreaded) _pthread_rwlock_rdlock(x); \
39 #define _RWLOCK_WRLOCK(x) \
41 if (__isthreaded) _pthread_rwlock_wrlock(x); \
44 #define _RWLOCK_UNLOCK(x) \
46 if (__isthreaded) _pthread_rwlock_unlock(x); \
49 #ifndef TZ_ABBR_MAX_LEN
50 #define TZ_ABBR_MAX_LEN 16
51 #endif /* !defined TZ_ABBR_MAX_LEN */
53 #ifndef TZ_ABBR_CHAR_SET
54 #define TZ_ABBR_CHAR_SET \
55 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._"
56 #endif /* !defined TZ_ABBR_CHAR_SET */
58 #ifndef TZ_ABBR_ERR_CHAR
59 #define TZ_ABBR_ERR_CHAR '_'
60 #endif /* !defined TZ_ABBR_ERR_CHAR */
63 ** Someone might make incorrect use of a time zone abbreviation:
64 ** 1. They might reference tzname[0] before calling tzset (explicitly
66 ** 2. They might reference tzname[1] before calling tzset (explicitly
68 ** 3. They might reference tzname[1] after setting to a time zone
69 ** in which Daylight Saving Time is never observed.
70 ** 4. They might reference tzname[0] after setting to a time zone
71 ** in which Standard Time is never observed.
72 ** 5. They might reference tm.TM_ZONE after calling offtime.
73 ** What's best to do in the above cases is open to debate;
74 ** for now, we just set things up so that in any of the five cases
75 ** WILDABBR is used. Another possibility: initialize tzname[0] to the
76 ** string "tzname[0] used before set", and similarly for the other cases.
77 ** And another: initialize tzname[0] to "ERA", with an explanation in the
78 ** manual page of what this "time zone abbreviation" means (doing this so
79 ** that tzname[0] has the "normal" length of three characters).
83 static char wildabbr[] = WILDABBR;
85 static const char gmt[] = "UTC";
88 ** The DST rules to use if TZ has no rules and we can't load TZDEFRULES.
89 ** We default to US rules as of 1999-08-17.
90 ** POSIX 1003.1 section 8.1.1 says that the default DST rules are
91 ** implementation dependent; for historical reasons, US rules are a
94 #ifndef TZDEFRULESTRING
95 #define TZDEFRULESTRING ",M4.1.0,M10.5.0"
96 #endif /* !defined TZDEFDST */
98 struct ttinfo { /* time type information */
99 long tt_gmtoff; /* UTC offset in seconds */
100 int tt_isdst; /* used to set tm_isdst */
101 int tt_abbrind; /* abbreviation list index */
102 int tt_ttisstd; /* TRUE if transition is std time */
103 int tt_ttisgmt; /* TRUE if transition is UTC */
106 struct lsinfo { /* leap second information */
107 time_t ls_trans; /* transition time */
108 long ls_corr; /* correction to apply */
111 #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b))
114 #define MY_TZNAME_MAX TZNAME_MAX
115 #endif /* defined TZNAME_MAX */
117 #define MY_TZNAME_MAX 255
118 #endif /* !defined TZNAME_MAX */
127 time_t ats[TZ_MAX_TIMES];
128 unsigned char types[TZ_MAX_TIMES];
129 struct ttinfo ttis[TZ_MAX_TYPES];
130 char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt),
131 (2 * (MY_TZNAME_MAX + 1)))];
132 struct lsinfo lsis[TZ_MAX_LEAPS];
136 int r_type; /* type of rule--see below */
137 int r_day; /* day number of rule */
138 int r_week; /* week number of rule */
139 int r_mon; /* month number of rule */
140 long r_time; /* transition time of rule */
143 #define JULIAN_DAY 0 /* Jn - Julian day */
144 #define DAY_OF_YEAR 1 /* n - day of year */
145 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */
148 ** Prototypes for static functions.
151 static long detzcode(const char * codep);
152 static time_t detzcode64(const char * codep);
153 static int differ_by_repeat(time_t t1, time_t t0);
154 static const char * getzname(const char * strp);
155 static const char * getqzname(const char * strp, const int delim);
156 static const char * getnum(const char * strp, int * nump, int min,
158 static const char * getsecs(const char * strp, long * secsp);
159 static const char * getoffset(const char * strp, long * offsetp);
160 static const char * getrule(const char * strp, struct rule * rulep);
161 static void gmtload(struct state * sp);
162 static struct tm * gmtsub(const time_t * timep, long offset,
164 static struct tm * localsub(const time_t * timep, long offset,
166 static int increment_overflow(int * number, int delta);
167 static int leaps_thru_end_of(int y);
168 static int long_increment_overflow(long * number, int delta);
169 static int long_normalize_overflow(long * tensptr,
170 int * unitsptr, int base);
171 static int normalize_overflow(int * tensptr, int * unitsptr,
173 static void settzname(void);
174 static time_t time1(struct tm * tmp,
175 struct tm * (*funcp)(const time_t *,
178 static time_t time2(struct tm *tmp,
179 struct tm * (*funcp)(const time_t *,
181 long offset, int * okayp);
182 static time_t time2sub(struct tm *tmp,
183 struct tm * (*funcp)(const time_t *,
185 long offset, int * okayp, int do_norm_secs);
186 static struct tm * timesub(const time_t * timep, long offset,
187 const struct state * sp, struct tm * tmp);
188 static int tmcomp(const struct tm * atmp,
189 const struct tm * btmp);
190 static time_t transtime(time_t janfirst, int year,
191 const struct rule * rulep, long offset);
192 static int typesequiv(const struct state * sp, int a, int b);
193 static int tzload(const char * name, struct state * sp,
195 static int tzparse(const char * name, struct state * sp,
198 static struct state lclmem;
199 static struct state gmtmem;
200 #define lclptr (&lclmem)
201 #define gmtptr (&gmtmem)
203 #ifndef TZ_STRLEN_MAX
204 #define TZ_STRLEN_MAX 255
205 #endif /* !defined TZ_STRLEN_MAX */
207 static char lcl_TZname[TZ_STRLEN_MAX + 1];
208 static int lcl_is_set;
209 static int gmt_is_set;
210 static pthread_rwlock_t lcl_rwlock = PTHREAD_RWLOCK_INITIALIZER;
211 static pthread_mutex_t gmt_mutex = PTHREAD_MUTEX_INITIALIZER;
219 ** Section 4.12.3 of X3.159-1989 requires that
220 ** Except for the strftime function, these functions [asctime,
221 ** ctime, gmtime, localtime] return values in one of two static
222 ** objects: a broken-down time structure and an array of char.
223 ** Thanks to Paul Eggert for noting this.
232 detzcode(const char * const codep)
237 result = (codep[0] & 0x80) ? ~0L : 0;
238 for (i = 0; i < 4; ++i)
239 result = (result << 8) | (codep[i] & 0xff);
244 detzcode64(const char * const codep)
249 result = (codep[0] & 0x80) ? (~(int_fast64_t) 0) : 0;
250 for (i = 0; i < 8; ++i)
251 result = result * 256 + (codep[i] & 0xff);
258 struct state * const sp = lclptr;
261 tzname[0] = wildabbr;
262 tzname[1] = wildabbr;
266 for (i = 0; i < sp->typecnt; ++i) {
267 const struct ttinfo * const ttisp = &sp->ttis[i];
269 tzname[ttisp->tt_isdst] =
270 &sp->chars[ttisp->tt_abbrind];
273 if (i == 0 || !ttisp->tt_isdst)
274 timezone = -(ttisp->tt_gmtoff);
277 ** And to get the latest zone names into tzname. . .
279 for (i = 0; i < sp->timecnt; ++i) {
280 const struct ttinfo * const ttisp =
284 tzname[ttisp->tt_isdst] =
285 &sp->chars[ttisp->tt_abbrind];
288 ** Finally, scrub the abbreviations.
289 ** First, replace bogus characters.
291 for (i = 0; i < sp->charcnt; ++i)
292 if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL)
293 sp->chars[i] = TZ_ABBR_ERR_CHAR;
295 ** Second, truncate long abbreviations.
297 for (i = 0; i < sp->typecnt; ++i) {
298 const struct ttinfo * const ttisp = &sp->ttis[i];
299 char * cp = &sp->chars[ttisp->tt_abbrind];
301 if (strlen(cp) > TZ_ABBR_MAX_LEN &&
302 strcmp(cp, GRANDPARENTED) != 0)
303 *(cp + TZ_ABBR_MAX_LEN) = '\0';
308 differ_by_repeat(const time_t t1, const time_t t0)
310 int_fast64_t _t0 = t0;
311 int_fast64_t _t1 = t1;
313 if (TYPE_INTEGRAL(time_t) &&
314 TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS)
316 return _t1 - _t0 == SECSPERREPEAT;
320 tzload(const char *name, struct state * const sp, const int doextend)
328 struct tzhead tzhead;
329 char buf[2 * sizeof(struct tzhead) +
334 sp->goback = sp->goahead = FALSE;
336 /* XXX The following is from OpenBSD, and I'm not sure it is correct */
337 if (name != NULL && issetugid() != 0)
338 if ((name[0] == ':' && name[1] == '/') ||
339 name[0] == '/' || strchr(name, '.'))
341 if (name == NULL && (name = TZDEFAULT) == NULL)
347 ** Section 4.9.1 of the C standard says that
348 ** "FILENAME_MAX expands to an integral constant expression
349 ** that is the size needed for an array of char large enough
350 ** to hold the longest file name string that the implementation
351 ** guarantees can be opened."
353 char fullname[FILENAME_MAX + 1];
357 doaccess = name[0] == '/';
359 if ((p = TZDIR) == NULL)
361 if ((strlen(p) + 1 + strlen(name) + 1) >= sizeof fullname)
364 strcat(fullname, "/");
365 strcat(fullname, name);
367 ** Set doaccess if '.' (as in "../") shows up in name.
369 if (strchr(name, '.') != NULL)
373 if (doaccess && access(name, R_OK) != 0)
375 if ((fid = _open(name, O_RDONLY)) == -1)
377 if ((_fstat(fid, &stab) < 0) || !S_ISREG(stab.st_mode)) {
382 nread = read(fid, u.buf, sizeof u.buf);
383 if (close(fid) < 0 || nread <= 0)
385 for (stored = 4; stored <= 8; stored *= 2) {
389 ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt);
390 ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt);
391 sp->leapcnt = (int) detzcode(u.tzhead.tzh_leapcnt);
392 sp->timecnt = (int) detzcode(u.tzhead.tzh_timecnt);
393 sp->typecnt = (int) detzcode(u.tzhead.tzh_typecnt);
394 sp->charcnt = (int) detzcode(u.tzhead.tzh_charcnt);
395 p = u.tzhead.tzh_charcnt + sizeof u.tzhead.tzh_charcnt;
396 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS ||
397 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES ||
398 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES ||
399 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS ||
400 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) ||
401 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0))
403 if (nread - (p - u.buf) <
404 sp->timecnt * stored + /* ats */
405 sp->timecnt + /* types */
406 sp->typecnt * 6 + /* ttinfos */
407 sp->charcnt + /* chars */
408 sp->leapcnt * (stored + 4) + /* lsinfos */
409 ttisstdcnt + /* ttisstds */
410 ttisgmtcnt) /* ttisgmts */
412 for (i = 0; i < sp->timecnt; ++i) {
413 sp->ats[i] = (stored == 4) ?
414 detzcode(p) : detzcode64(p);
417 for (i = 0; i < sp->timecnt; ++i) {
418 sp->types[i] = (unsigned char) *p++;
419 if (sp->types[i] >= sp->typecnt)
422 for (i = 0; i < sp->typecnt; ++i) {
423 struct ttinfo * ttisp;
425 ttisp = &sp->ttis[i];
426 ttisp->tt_gmtoff = detzcode(p);
428 ttisp->tt_isdst = (unsigned char) *p++;
429 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1)
431 ttisp->tt_abbrind = (unsigned char) *p++;
432 if (ttisp->tt_abbrind < 0 ||
433 ttisp->tt_abbrind > sp->charcnt)
436 for (i = 0; i < sp->charcnt; ++i)
438 sp->chars[i] = '\0'; /* ensure '\0' at end */
439 for (i = 0; i < sp->leapcnt; ++i) {
440 struct lsinfo * lsisp;
442 lsisp = &sp->lsis[i];
443 lsisp->ls_trans = (stored == 4) ?
444 detzcode(p) : detzcode64(p);
446 lsisp->ls_corr = detzcode(p);
449 for (i = 0; i < sp->typecnt; ++i) {
450 struct ttinfo * ttisp;
452 ttisp = &sp->ttis[i];
454 ttisp->tt_ttisstd = FALSE;
456 ttisp->tt_ttisstd = *p++;
457 if (ttisp->tt_ttisstd != TRUE &&
458 ttisp->tt_ttisstd != FALSE)
462 for (i = 0; i < sp->typecnt; ++i) {
463 struct ttinfo * ttisp;
465 ttisp = &sp->ttis[i];
467 ttisp->tt_ttisgmt = FALSE;
469 ttisp->tt_ttisgmt = *p++;
470 if (ttisp->tt_ttisgmt != TRUE &&
471 ttisp->tt_ttisgmt != FALSE)
476 ** Out-of-sort ats should mean we're running on a
477 ** signed time_t system but using a data file with
478 ** unsigned values (or vice versa).
480 for (i = 0; i < sp->timecnt - 2; ++i)
481 if (sp->ats[i] > sp->ats[i + 1]) {
483 if (TYPE_SIGNED(time_t)) {
485 ** Ignore the end (easy).
490 ** Ignore the beginning (harder).
494 for (j = 0; j + i < sp->timecnt; ++j) {
495 sp->ats[j] = sp->ats[j + i];
496 sp->types[j] = sp->types[j + i];
503 ** If this is an old file, we're done.
505 if (u.tzhead.tzh_version[0] == '\0')
508 for (i = 0; i < nread; ++i)
511 ** If this is a narrow integer time_t system, we're done.
513 if (stored >= (int) sizeof(time_t) && TYPE_INTEGRAL(time_t))
516 if (doextend && nread > 2 &&
517 u.buf[0] == '\n' && u.buf[nread - 1] == '\n' &&
518 sp->typecnt + 2 <= TZ_MAX_TYPES) {
522 u.buf[nread - 1] = '\0';
523 result = tzparse(&u.buf[1], &ts, FALSE);
524 if (result == 0 && ts.typecnt == 2 &&
525 sp->charcnt + ts.charcnt <= TZ_MAX_CHARS) {
526 for (i = 0; i < 2; ++i)
527 ts.ttis[i].tt_abbrind +=
529 for (i = 0; i < ts.charcnt; ++i)
530 sp->chars[sp->charcnt++] =
533 while (i < ts.timecnt &&
535 sp->ats[sp->timecnt - 1])
537 while (i < ts.timecnt &&
538 sp->timecnt < TZ_MAX_TIMES) {
539 sp->ats[sp->timecnt] =
541 sp->types[sp->timecnt] =
547 sp->ttis[sp->typecnt++] = ts.ttis[0];
548 sp->ttis[sp->typecnt++] = ts.ttis[1];
551 if (sp->timecnt > 1) {
552 for (i = 1; i < sp->timecnt; ++i)
553 if (typesequiv(sp, sp->types[i], sp->types[0]) &&
554 differ_by_repeat(sp->ats[i], sp->ats[0])) {
558 for (i = sp->timecnt - 2; i >= 0; --i)
559 if (typesequiv(sp, sp->types[sp->timecnt - 1],
561 differ_by_repeat(sp->ats[sp->timecnt - 1],
571 typesequiv(const struct state * const sp, const int a, const int b)
576 a < 0 || a >= sp->typecnt ||
577 b < 0 || b >= sp->typecnt)
580 const struct ttinfo * ap = &sp->ttis[a];
581 const struct ttinfo * bp = &sp->ttis[b];
582 result = ap->tt_gmtoff == bp->tt_gmtoff &&
583 ap->tt_isdst == bp->tt_isdst &&
584 ap->tt_ttisstd == bp->tt_ttisstd &&
585 ap->tt_ttisgmt == bp->tt_ttisgmt &&
586 strcmp(&sp->chars[ap->tt_abbrind],
587 &sp->chars[bp->tt_abbrind]) == 0;
592 static const int mon_lengths[2][MONSPERYEAR] = {
593 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
594 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
597 static const int year_lengths[2] = {
598 DAYSPERNYEAR, DAYSPERLYEAR
602 ** Given a pointer into a time zone string, scan until a character that is not
603 ** a valid character in a zone name is found. Return a pointer to that
608 getzname(const char *strp)
612 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' &&
619 ** Given a pointer into an extended time zone string, scan until the ending
620 ** delimiter of the zone name is located. Return a pointer to the delimiter.
622 ** As with getzname above, the legal character set is actually quite
623 ** restricted, with other characters producing undefined results.
624 ** We don't do any checking here; checking is done later in common-case code.
628 getqzname(const char *strp, const int delim)
632 while ((c = *strp) != '\0' && c != delim)
638 ** Given a pointer into a time zone string, extract a number from that string.
639 ** Check that the number is within a specified range; if it is not, return
641 ** Otherwise, return a pointer to the first character not part of the number.
645 getnum(const char *strp, int * const nump, const int min, const int max)
650 if (strp == NULL || !is_digit(c = *strp))
654 num = num * 10 + (c - '0');
656 return NULL; /* illegal value */
658 } while (is_digit(c));
660 return NULL; /* illegal value */
666 ** Given a pointer into a time zone string, extract a number of seconds,
667 ** in hh[:mm[:ss]] form, from the string.
668 ** If any error occurs, return NULL.
669 ** Otherwise, return a pointer to the first character not part of the number
674 getsecs(const char *strp, long * const secsp)
679 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like
680 ** "M10.4.6/26", which does not conform to Posix,
681 ** but which specifies the equivalent of
682 ** ``02:00 on the first Sunday on or after 23 Oct''.
684 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1);
687 *secsp = num * (long) SECSPERHOUR;
690 strp = getnum(strp, &num, 0, MINSPERHOUR - 1);
693 *secsp += num * SECSPERMIN;
696 /* `SECSPERMIN' allows for leap seconds. */
697 strp = getnum(strp, &num, 0, SECSPERMIN);
707 ** Given a pointer into a time zone string, extract an offset, in
708 ** [+-]hh[:mm[:ss]] form, from the string.
709 ** If any error occurs, return NULL.
710 ** Otherwise, return a pointer to the first character not part of the time.
714 getoffset(const char *strp, long * const offsetp)
721 } else if (*strp == '+')
723 strp = getsecs(strp, offsetp);
725 return NULL; /* illegal time */
727 *offsetp = -*offsetp;
732 ** Given a pointer into a time zone string, extract a rule in the form
733 ** date[/time]. See POSIX section 8 for the format of "date" and "time".
734 ** If a valid rule is not found, return NULL.
735 ** Otherwise, return a pointer to the first character not part of the rule.
739 getrule(const char *strp, struct rule * const rulep)
745 rulep->r_type = JULIAN_DAY;
747 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR);
748 } else if (*strp == 'M') {
752 rulep->r_type = MONTH_NTH_DAY_OF_WEEK;
754 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR);
759 strp = getnum(strp, &rulep->r_week, 1, 5);
764 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1);
765 } else if (is_digit(*strp)) {
769 rulep->r_type = DAY_OF_YEAR;
770 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1);
771 } else return NULL; /* invalid format */
779 strp = getsecs(strp, &rulep->r_time);
780 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */
785 ** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the
786 ** year, a rule, and the offset from UTC at the time that rule takes effect,
787 ** calculate the Epoch-relative time that rule takes effect.
791 transtime(const time_t janfirst, const int year,
792 const struct rule * const rulep, const long offset)
797 int d, m1, yy0, yy1, yy2, dow;
800 leapyear = isleap(year);
801 switch (rulep->r_type) {
805 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap
807 ** In non-leap years, or if the day number is 59 or less, just
808 ** add SECSPERDAY times the day number-1 to the time of
809 ** January 1, midnight, to get the day.
811 value = janfirst + (rulep->r_day - 1) * SECSPERDAY;
812 if (leapyear && rulep->r_day >= 60)
819 ** Just add SECSPERDAY times the day number to the time of
820 ** January 1, midnight, to get the day.
822 value = janfirst + rulep->r_day * SECSPERDAY;
825 case MONTH_NTH_DAY_OF_WEEK:
827 ** Mm.n.d - nth "dth day" of month m.
830 for (i = 0; i < rulep->r_mon - 1; ++i)
831 value += mon_lengths[leapyear][i] * SECSPERDAY;
834 ** Use Zeller's Congruence to get day-of-week of first day of
837 m1 = (rulep->r_mon + 9) % 12 + 1;
838 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year;
841 dow = ((26 * m1 - 2) / 10 +
842 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7;
847 ** "dow" is the day-of-week of the first day of the month. Get
848 ** the day-of-month (zero-origin) of the first "dow" day of the
851 d = rulep->r_day - dow;
854 for (i = 1; i < rulep->r_week; ++i) {
855 if (d + DAYSPERWEEK >=
856 mon_lengths[leapyear][rulep->r_mon - 1])
862 ** "d" is the day-of-month (zero-origin) of the day we want.
864 value += d * SECSPERDAY;
869 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in
870 ** question. To get the Epoch-relative time of the specified local
871 ** time on that day, add the transition time and the current offset
874 return value + rulep->r_time + offset;
878 ** Given a POSIX section 8-style TZ string, fill in the rule tables as
883 tzparse(const char *name, struct state * const sp, const int lastditch)
885 const char * stdname;
886 const char * dstname;
892 unsigned char * typep;
899 stdlen = strlen(name); /* length of standard zone name */
901 if (stdlen >= sizeof sp->chars)
902 stdlen = (sizeof sp->chars) - 1;
908 name = getqzname(name, '>');
911 stdlen = name - stdname;
914 name = getzname(name);
915 stdlen = name - stdname;
919 name = getoffset(name, &stdoffset);
923 load_result = tzload(TZDEFRULES, sp, FALSE);
924 if (load_result != 0)
925 sp->leapcnt = 0; /* so, we're off a little */
929 name = getqzname(name, '>');
932 dstlen = name - dstname;
936 name = getzname(name);
937 dstlen = name - dstname; /* length of DST zone name */
939 if (*name != '\0' && *name != ',' && *name != ';') {
940 name = getoffset(name, &dstoffset);
943 } else dstoffset = stdoffset - SECSPERHOUR;
944 if (*name == '\0' && load_result != 0)
945 name = TZDEFRULESTRING;
946 if (*name == ',' || *name == ';') {
955 if ((name = getrule(name, &start)) == NULL)
959 if ((name = getrule(name, &end)) == NULL)
963 sp->typecnt = 2; /* standard time and DST */
965 ** Two transitions per year, from EPOCH_YEAR forward.
967 sp->ttis[0].tt_gmtoff = -dstoffset;
968 sp->ttis[0].tt_isdst = 1;
969 sp->ttis[0].tt_abbrind = stdlen + 1;
970 sp->ttis[1].tt_gmtoff = -stdoffset;
971 sp->ttis[1].tt_isdst = 0;
972 sp->ttis[1].tt_abbrind = 0;
977 for (year = EPOCH_YEAR;
978 sp->timecnt + 2 <= TZ_MAX_TIMES;
982 starttime = transtime(janfirst, year, &start,
984 endtime = transtime(janfirst, year, &end,
986 if (starttime > endtime) {
988 *typep++ = 1; /* DST ends */
990 *typep++ = 0; /* DST begins */
993 *typep++ = 0; /* DST begins */
995 *typep++ = 1; /* DST ends */
999 newfirst += year_lengths[isleap(year)] *
1001 if (newfirst <= janfirst)
1003 janfirst = newfirst;
1006 long theirstdoffset;
1007 long theirdstoffset;
1016 ** Initial values of theirstdoffset and theirdstoffset.
1019 for (i = 0; i < sp->timecnt; ++i) {
1021 if (!sp->ttis[j].tt_isdst) {
1023 -sp->ttis[j].tt_gmtoff;
1028 for (i = 0; i < sp->timecnt; ++i) {
1030 if (sp->ttis[j].tt_isdst) {
1032 -sp->ttis[j].tt_gmtoff;
1037 ** Initially we're assumed to be in standard time.
1040 theiroffset = theirstdoffset;
1042 ** Now juggle transition times and types
1043 ** tracking offsets as you do.
1045 for (i = 0; i < sp->timecnt; ++i) {
1047 sp->types[i] = sp->ttis[j].tt_isdst;
1048 if (sp->ttis[j].tt_ttisgmt) {
1049 /* No adjustment to transition time */
1052 ** If summer time is in effect, and the
1053 ** transition time was not specified as
1054 ** standard time, add the summer time
1055 ** offset to the transition time;
1056 ** otherwise, add the standard time
1057 ** offset to the transition time.
1060 ** Transitions from DST to DDST
1061 ** will effectively disappear since
1062 ** POSIX provides for only one DST
1065 if (isdst && !sp->ttis[j].tt_ttisstd) {
1066 sp->ats[i] += dstoffset -
1069 sp->ats[i] += stdoffset -
1073 theiroffset = -sp->ttis[j].tt_gmtoff;
1074 if (sp->ttis[j].tt_isdst)
1075 theirdstoffset = theiroffset;
1076 else theirstdoffset = theiroffset;
1079 ** Finally, fill in ttis.
1080 ** ttisstd and ttisgmt need not be handled.
1082 sp->ttis[0].tt_gmtoff = -stdoffset;
1083 sp->ttis[0].tt_isdst = FALSE;
1084 sp->ttis[0].tt_abbrind = 0;
1085 sp->ttis[1].tt_gmtoff = -dstoffset;
1086 sp->ttis[1].tt_isdst = TRUE;
1087 sp->ttis[1].tt_abbrind = stdlen + 1;
1092 sp->typecnt = 1; /* only standard time */
1094 sp->ttis[0].tt_gmtoff = -stdoffset;
1095 sp->ttis[0].tt_isdst = 0;
1096 sp->ttis[0].tt_abbrind = 0;
1098 sp->charcnt = stdlen + 1;
1100 sp->charcnt += dstlen + 1;
1101 if ((size_t) sp->charcnt > sizeof sp->chars)
1104 strncpy(cp, stdname, stdlen);
1108 strncpy(cp, dstname, dstlen);
1109 *(cp + dstlen) = '\0';
1115 gmtload(struct state * const sp)
1117 if (tzload(gmt, sp, TRUE) != 0)
1118 tzparse(gmt, sp, TRUE);
1122 tzsetwall_basic(int rdlocked)
1125 _RWLOCK_RDLOCK(&lcl_rwlock);
1126 if (lcl_is_set < 0) {
1128 _RWLOCK_UNLOCK(&lcl_rwlock);
1131 _RWLOCK_UNLOCK(&lcl_rwlock);
1133 _RWLOCK_WRLOCK(&lcl_rwlock);
1136 if (tzload(NULL, lclptr, TRUE) != 0)
1139 _RWLOCK_UNLOCK(&lcl_rwlock);
1142 _RWLOCK_RDLOCK(&lcl_rwlock);
1152 tzset_basic(int rdlocked)
1156 name = getenv("TZ");
1158 tzsetwall_basic(rdlocked);
1163 _RWLOCK_RDLOCK(&lcl_rwlock);
1164 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) {
1166 _RWLOCK_UNLOCK(&lcl_rwlock);
1169 _RWLOCK_UNLOCK(&lcl_rwlock);
1171 _RWLOCK_WRLOCK(&lcl_rwlock);
1172 lcl_is_set = strlen(name) < sizeof lcl_TZname;
1174 strcpy(lcl_TZname, name);
1176 if (*name == '\0') {
1178 ** User wants it fast rather than right.
1180 lclptr->leapcnt = 0; /* so, we're off a little */
1181 lclptr->timecnt = 0;
1182 lclptr->typecnt = 0;
1183 lclptr->ttis[0].tt_isdst = 0;
1184 lclptr->ttis[0].tt_gmtoff = 0;
1185 lclptr->ttis[0].tt_abbrind = 0;
1186 strcpy(lclptr->chars, gmt);
1187 } else if (tzload(name, lclptr, TRUE) != 0)
1188 if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0)
1191 _RWLOCK_UNLOCK(&lcl_rwlock);
1194 _RWLOCK_RDLOCK(&lcl_rwlock);
1204 ** The easy way to behave "as if no library function calls" localtime
1205 ** is to not call it--so we drop its guts into "localsub", which can be
1206 ** freely called. (And no, the PANS doesn't require the above behavior--
1207 ** but it *is* desirable.)
1209 ** The unused offset argument is for the benefit of mktime variants.
1214 localsub(const time_t * const timep, const long offset __unused,
1215 struct tm * const tmp)
1218 const struct ttinfo * ttisp;
1221 const time_t t = *timep;
1225 if ((sp->goback && t < sp->ats[0]) ||
1226 (sp->goahead && t > sp->ats[sp->timecnt - 1])) {
1230 int_fast64_t icycles;
1233 seconds = sp->ats[0] - t;
1234 else seconds = t - sp->ats[sp->timecnt - 1];
1236 tcycles = seconds / YEARSPERREPEAT / AVGSECSPERYEAR;
1239 if (tcycles - icycles >= 1 || icycles - tcycles >= 1)
1242 seconds *= YEARSPERREPEAT;
1243 seconds *= AVGSECSPERYEAR;
1246 else newt -= seconds;
1247 if (newt < sp->ats[0] ||
1248 newt > sp->ats[sp->timecnt - 1])
1249 return NULL; /* "cannot happen" */
1250 result = localsub(&newt, offset, tmp);
1251 if (result == tmp) {
1254 newy = tmp->tm_year;
1256 newy -= icycles * YEARSPERREPEAT;
1257 else newy += icycles * YEARSPERREPEAT;
1258 tmp->tm_year = newy;
1259 if (tmp->tm_year != newy)
1264 if (sp->timecnt == 0 || t < sp->ats[0]) {
1266 while (sp->ttis[i].tt_isdst)
1267 if (++i >= sp->typecnt) {
1273 int hi = sp->timecnt;
1276 int mid = (lo + hi) >> 1;
1278 if (t < sp->ats[mid])
1282 i = (int) sp->types[lo - 1];
1284 ttisp = &sp->ttis[i];
1286 ** To get (wrong) behavior that's compatible with System V Release 2.0
1287 ** you'd replace the statement below with
1288 ** t += ttisp->tt_gmtoff;
1289 ** timesub(&t, 0L, sp, tmp);
1291 result = timesub(&t, ttisp->tt_gmtoff, sp, tmp);
1292 tmp->tm_isdst = ttisp->tt_isdst;
1293 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind];
1295 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind];
1296 #endif /* defined TM_ZONE */
1301 localtime_r(const time_t * const timep, struct tm *p_tm)
1303 _RWLOCK_RDLOCK(&lcl_rwlock);
1305 localsub(timep, 0L, p_tm);
1306 _RWLOCK_UNLOCK(&lcl_rwlock);
1311 localtime(const time_t * const timep)
1313 static pthread_mutex_t localtime_mutex = PTHREAD_MUTEX_INITIALIZER;
1314 static pthread_key_t localtime_key = -1;
1317 if (__isthreaded != 0) {
1318 if (localtime_key < 0) {
1319 _pthread_mutex_lock(&localtime_mutex);
1320 if (localtime_key < 0) {
1321 if (_pthread_key_create(&localtime_key, free) < 0) {
1322 _pthread_mutex_unlock(&localtime_mutex);
1326 _pthread_mutex_unlock(&localtime_mutex);
1328 p_tm = _pthread_getspecific(localtime_key);
1330 if ((p_tm = (struct tm *)malloc(sizeof(struct tm)))
1333 _pthread_setspecific(localtime_key, p_tm);
1335 _RWLOCK_RDLOCK(&lcl_rwlock);
1337 localsub(timep, 0L, p_tm);
1338 _RWLOCK_UNLOCK(&lcl_rwlock);
1342 localsub(timep, 0L, &tm);
1348 ** gmtsub is to gmtime as localsub is to localtime.
1352 gmtsub(const time_t * const timep, const long offset, struct tm * const tmp)
1357 _MUTEX_LOCK(&gmt_mutex);
1362 _MUTEX_UNLOCK(&gmt_mutex);
1364 result = timesub(timep, offset, gmtptr, tmp);
1367 ** Could get fancy here and deliver something such as
1368 ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero,
1369 ** but this is no time for a treasure hunt.
1372 tmp->TM_ZONE = wildabbr;
1374 tmp->TM_ZONE = gmtptr->chars;
1375 #endif /* defined TM_ZONE */
1380 gmtime(const time_t * const timep)
1382 static pthread_mutex_t gmtime_mutex = PTHREAD_MUTEX_INITIALIZER;
1383 static pthread_key_t gmtime_key = -1;
1386 if (__isthreaded != 0) {
1387 if (gmtime_key < 0) {
1388 _pthread_mutex_lock(&gmtime_mutex);
1389 if (gmtime_key < 0) {
1390 if (_pthread_key_create(&gmtime_key, free) < 0) {
1391 _pthread_mutex_unlock(&gmtime_mutex);
1395 _pthread_mutex_unlock(&gmtime_mutex);
1398 * Changed to follow POSIX.1 threads standard, which
1399 * is what BSD currently has.
1401 if ((p_tm = _pthread_getspecific(gmtime_key)) == NULL) {
1402 if ((p_tm = (struct tm *)malloc(sizeof(struct tm)))
1406 _pthread_setspecific(gmtime_key, p_tm);
1408 return gmtsub(timep, 0L, p_tm);
1410 return gmtsub(timep, 0L, &tm);
1415 gmtime_r(const time_t * timep, struct tm * tmp)
1417 return gmtsub(timep, 0L, tmp);
1421 offtime(const time_t * const timep, const long offset)
1423 return gmtsub(timep, offset, &tm);
1427 ** Return the number of leap years through the end of the given year
1428 ** where, to make the math easy, the answer for year zero is defined as zero.
1432 leaps_thru_end_of(const int y)
1434 return (y >= 0) ? (y / 4 - y / 100 + y / 400) :
1435 -(leaps_thru_end_of(-(y + 1)) + 1);
1439 timesub(const time_t * const timep, const long offset,
1440 const struct state * const sp, struct tm * const tmp)
1442 const struct lsinfo * lp;
1444 int idays; /* unsigned would be so 2003 */
1459 if (*timep >= lp->ls_trans) {
1460 if (*timep == lp->ls_trans) {
1461 hit = ((i == 0 && lp->ls_corr > 0) ||
1462 lp->ls_corr > sp->lsis[i - 1].ls_corr);
1465 sp->lsis[i].ls_trans ==
1466 sp->lsis[i - 1].ls_trans + 1 &&
1467 sp->lsis[i].ls_corr ==
1468 sp->lsis[i - 1].ls_corr + 1) {
1478 tdays = *timep / SECSPERDAY;
1479 rem = *timep - tdays * SECSPERDAY;
1480 while (tdays < 0 || tdays >= year_lengths[isleap(y)]) {
1486 tdelta = tdays / DAYSPERLYEAR;
1488 if (tdelta - idelta >= 1 || idelta - tdelta >= 1)
1491 idelta = (tdays < 0) ? -1 : 1;
1493 if (increment_overflow(&newy, idelta))
1495 leapdays = leaps_thru_end_of(newy - 1) -
1496 leaps_thru_end_of(y - 1);
1497 tdays -= ((time_t) newy - y) * DAYSPERNYEAR;
1504 seconds = tdays * SECSPERDAY + 0.5;
1505 tdays = seconds / SECSPERDAY;
1506 rem += seconds - tdays * SECSPERDAY;
1509 ** Given the range, we can now fearlessly cast...
1512 rem += offset - corr;
1517 while (rem >= SECSPERDAY) {
1522 if (increment_overflow(&y, -1))
1524 idays += year_lengths[isleap(y)];
1526 while (idays >= year_lengths[isleap(y)]) {
1527 idays -= year_lengths[isleap(y)];
1528 if (increment_overflow(&y, 1))
1532 if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE))
1534 tmp->tm_yday = idays;
1536 ** The "extra" mods below avoid overflow problems.
1538 tmp->tm_wday = EPOCH_WDAY +
1539 ((y - EPOCH_YEAR) % DAYSPERWEEK) *
1540 (DAYSPERNYEAR % DAYSPERWEEK) +
1541 leaps_thru_end_of(y - 1) -
1542 leaps_thru_end_of(EPOCH_YEAR - 1) +
1544 tmp->tm_wday %= DAYSPERWEEK;
1545 if (tmp->tm_wday < 0)
1546 tmp->tm_wday += DAYSPERWEEK;
1547 tmp->tm_hour = (int) (rem / SECSPERHOUR);
1549 tmp->tm_min = (int) (rem / SECSPERMIN);
1551 ** A positive leap second requires a special
1552 ** representation. This uses "... ??:59:60" et seq.
1554 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit;
1555 ip = mon_lengths[isleap(y)];
1556 for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon))
1557 idays -= ip[tmp->tm_mon];
1558 tmp->tm_mday = (int) (idays + 1);
1561 tmp->TM_GMTOFF = offset;
1562 #endif /* defined TM_GMTOFF */
1567 ctime(const time_t * const timep)
1570 ** Section 4.12.3.2 of X3.159-1989 requires that
1571 ** The ctime function converts the calendar time pointed to by timer
1572 ** to local time in the form of a string. It is equivalent to
1573 ** asctime(localtime(timer))
1575 return asctime(localtime(timep));
1579 ctime_r(const time_t * const timep, char *buf)
1582 return asctime_r(localtime_r(timep, &mytm), buf);
1586 ** Adapted from code provided by Robert Elz, who writes:
1587 ** The "best" way to do mktime I think is based on an idea of Bob
1588 ** Kridle's (so its said...) from a long time ago.
1589 ** It does a binary search of the time_t space. Since time_t's are
1590 ** just 32 bits, its a max of 32 iterations (even at 64 bits it
1591 ** would still be very reasonable).
1596 #endif /* !defined WRONG */
1599 ** Simplified normalize logic courtesy Paul Eggert.
1603 increment_overflow(int *number, int delta)
1609 return (*number < number0) != (delta < 0);
1613 long_increment_overflow(long *number, int delta)
1619 return (*number < number0) != (delta < 0);
1623 normalize_overflow(int * const tensptr, int * const unitsptr, const int base)
1627 tensdelta = (*unitsptr >= 0) ?
1628 (*unitsptr / base) :
1629 (-1 - (-1 - *unitsptr) / base);
1630 *unitsptr -= tensdelta * base;
1631 return increment_overflow(tensptr, tensdelta);
1635 long_normalize_overflow(long * const tensptr, int * const unitsptr,
1640 tensdelta = (*unitsptr >= 0) ?
1641 (*unitsptr / base) :
1642 (-1 - (-1 - *unitsptr) / base);
1643 *unitsptr -= tensdelta * base;
1644 return long_increment_overflow(tensptr, tensdelta);
1648 tmcomp(const struct tm * const atmp, const struct tm * const btmp)
1652 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 &&
1653 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 &&
1654 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 &&
1655 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 &&
1656 (result = (atmp->tm_min - btmp->tm_min)) == 0)
1657 result = atmp->tm_sec - btmp->tm_sec;
1662 time2sub(struct tm * const tmp,
1663 struct tm * (* const funcp)(const time_t *, long, struct tm *),
1664 const long offset, int * const okayp, const int do_norm_secs)
1666 const struct state * sp;
1676 struct tm yourtm, mytm;
1681 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec,
1685 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR))
1687 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY))
1690 if (long_normalize_overflow(&y, &yourtm.tm_mon, MONSPERYEAR))
1693 ** Turn y into an actual year number for now.
1694 ** It is converted back to an offset from TM_YEAR_BASE later.
1696 if (long_increment_overflow(&y, TM_YEAR_BASE))
1698 while (yourtm.tm_mday <= 0) {
1699 if (long_increment_overflow(&y, -1))
1701 li = y + (1 < yourtm.tm_mon);
1702 yourtm.tm_mday += year_lengths[isleap(li)];
1704 while (yourtm.tm_mday > DAYSPERLYEAR) {
1705 li = y + (1 < yourtm.tm_mon);
1706 yourtm.tm_mday -= year_lengths[isleap(li)];
1707 if (long_increment_overflow(&y, 1))
1711 i = mon_lengths[isleap(y)][yourtm.tm_mon];
1712 if (yourtm.tm_mday <= i)
1714 yourtm.tm_mday -= i;
1715 if (++yourtm.tm_mon >= MONSPERYEAR) {
1717 if (long_increment_overflow(&y, 1))
1721 if (long_increment_overflow(&y, -TM_YEAR_BASE))
1724 if (yourtm.tm_year != y)
1726 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN)
1728 else if (y + TM_YEAR_BASE < EPOCH_YEAR) {
1730 ** We can't set tm_sec to 0, because that might push the
1731 ** time below the minimum representable time.
1732 ** Set tm_sec to 59 instead.
1733 ** This assumes that the minimum representable time is
1734 ** not in the same minute that a leap second was deleted from,
1735 ** which is a safer assumption than using 58 would be.
1737 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN))
1739 saved_seconds = yourtm.tm_sec;
1740 yourtm.tm_sec = SECSPERMIN - 1;
1742 saved_seconds = yourtm.tm_sec;
1746 ** Do a binary search (this works whatever time_t's type is).
1748 if (!TYPE_SIGNED(time_t)) {
1751 } else if (!TYPE_INTEGRAL(time_t)) {
1752 if (sizeof(time_t) > sizeof(float))
1753 hi = (time_t) DBL_MAX;
1754 else hi = (time_t) FLT_MAX;
1758 for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i)
1763 t = lo / 2 + hi / 2;
1768 if ((*funcp)(&t, offset, &mytm) == NULL) {
1770 ** Assume that t is too extreme to be represented in
1771 ** a struct tm; arrange things so that it is less
1772 ** extreme on the next pass.
1774 dir = (t > 0) ? 1 : -1;
1775 } else dir = tmcomp(&mytm, &yourtm);
1782 } else if (t == hi) {
1795 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst)
1798 ** Right time, wrong type.
1799 ** Hunt for right time, right type.
1800 ** It's okay to guess wrong since the guess
1803 sp = (const struct state *)
1804 ((funcp == localsub) ? lclptr : gmtptr);
1806 for (i = sp->typecnt - 1; i >= 0; --i) {
1807 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst)
1809 for (j = sp->typecnt - 1; j >= 0; --j) {
1810 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst)
1812 newt = t + sp->ttis[j].tt_gmtoff -
1813 sp->ttis[i].tt_gmtoff;
1814 if ((*funcp)(&newt, offset, &mytm) == NULL)
1816 if (tmcomp(&mytm, &yourtm) != 0)
1818 if (mytm.tm_isdst != yourtm.tm_isdst)
1830 newt = t + saved_seconds;
1831 if ((newt < t) != (saved_seconds < 0))
1834 if ((*funcp)(&t, offset, tmp))
1840 time2(struct tm * const tmp,
1841 struct tm * (* const funcp)(const time_t *, long, struct tm *),
1842 const long offset, int * const okayp)
1847 ** First try without normalization of seconds
1848 ** (in case tm_sec contains a value associated with a leap second).
1849 ** If that fails, try with normalization of seconds.
1851 t = time2sub(tmp, funcp, offset, okayp, FALSE);
1852 return *okayp ? t : time2sub(tmp, funcp, offset, okayp, TRUE);
1856 time1(struct tm * const tmp,
1857 struct tm * (* const funcp)(const time_t *, long, struct tm *),
1861 const struct state * sp;
1863 int sameind, otherind;
1866 int seen[TZ_MAX_TYPES];
1867 int types[TZ_MAX_TYPES];
1874 if (tmp->tm_isdst > 1)
1876 t = time2(tmp, funcp, offset, &okay);
1879 ** PCTS code courtesy Grant Sullivan.
1883 if (tmp->tm_isdst < 0)
1884 tmp->tm_isdst = 0; /* reset to std and try again */
1887 ** We're supposed to assume that somebody took a time of one type
1888 ** and did some math on it that yielded a "struct tm" that's bad.
1889 ** We try to divine the type they started from and adjust to the
1892 sp = (const struct state *) ((funcp == localsub) ? lclptr : gmtptr);
1894 for (i = 0; i < sp->typecnt; ++i)
1897 for (i = sp->timecnt - 1; i >= 0; --i)
1898 if (!seen[sp->types[i]]) {
1899 seen[sp->types[i]] = TRUE;
1900 types[nseen++] = sp->types[i];
1902 for (sameind = 0; sameind < nseen; ++sameind) {
1903 samei = types[sameind];
1904 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst)
1906 for (otherind = 0; otherind < nseen; ++otherind) {
1907 otheri = types[otherind];
1908 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst)
1910 tmp->tm_sec += sp->ttis[otheri].tt_gmtoff -
1911 sp->ttis[samei].tt_gmtoff;
1912 tmp->tm_isdst = !tmp->tm_isdst;
1913 t = time2(tmp, funcp, offset, &okay);
1916 tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff -
1917 sp->ttis[samei].tt_gmtoff;
1918 tmp->tm_isdst = !tmp->tm_isdst;
1925 mktime(struct tm * const tmp)
1927 time_t mktime_return_value;
1928 _RWLOCK_RDLOCK(&lcl_rwlock);
1930 mktime_return_value = time1(tmp, localsub, 0L);
1931 _RWLOCK_UNLOCK(&lcl_rwlock);
1932 return(mktime_return_value);
1936 timelocal(struct tm * const tmp)
1939 tmp->tm_isdst = -1; /* in case it wasn't initialized */
1944 timegm(struct tm * const tmp)
1948 return time1(tmp, gmtsub, 0L);
1952 timeoff(struct tm * const tmp, const long offset)
1956 return time1(tmp, gmtsub, offset);
1962 ** The following is supplied for compatibility with
1963 ** previous versions of the CMUCS runtime library.
1967 gtime(struct tm * const tmp)
1969 const time_t t = mktime(tmp);
1976 #endif /* defined CMUCS */
1979 ** XXX--is the below the right way to conditionalize??
1983 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599
1984 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which
1985 ** is not the case if we are accounting for leap seconds.
1986 ** So, we provide the following conversion routines for use
1987 ** when exchanging timestamps with POSIX conforming systems.
1991 leapcorr(time_t *timep)
2001 if (*timep >= lp->ls_trans)
2008 time2posix(time_t t)
2011 return t - leapcorr(&t);
2015 posix2time(time_t t)
2022 ** For a positive leap second hit, the result
2023 ** is not unique. For a negative leap second
2024 ** hit, the corresponding time doesn't exist,
2025 ** so we return an adjacent second.
2027 x = t + leapcorr(&t);
2028 y = x - leapcorr(&x);
2032 y = x - leapcorr(&x);
2039 y = x - leapcorr(&x);