2 ** This file is in the public domain, so clarified as of
3 ** 1996-06-05 by Arthur David Olson.
5 ** @(#)localtime.c 8.15
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;
267 ** And to get the latest zone names into tzname. . .
269 for (i = 0; i < sp->timecnt; ++i) {
270 const struct ttinfo * const ttisp =
274 tzname[ttisp->tt_isdst] =
275 &sp->chars[ttisp->tt_abbrind];
278 if (!ttisp->tt_isdst)
279 timezone = -(ttisp->tt_gmtoff);
282 ** Finally, scrub the abbreviations.
283 ** First, replace bogus characters.
285 for (i = 0; i < sp->charcnt; ++i)
286 if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL)
287 sp->chars[i] = TZ_ABBR_ERR_CHAR;
289 ** Second, truncate long abbreviations.
291 for (i = 0; i < sp->typecnt; ++i) {
292 const struct ttinfo * const ttisp = &sp->ttis[i];
293 char * cp = &sp->chars[ttisp->tt_abbrind];
295 if (strlen(cp) > TZ_ABBR_MAX_LEN &&
296 strcmp(cp, GRANDPARENTED) != 0)
297 *(cp + TZ_ABBR_MAX_LEN) = '\0';
302 differ_by_repeat(const time_t t1, const time_t t0)
304 int_fast64_t _t0 = t0;
305 int_fast64_t _t1 = t1;
307 if (TYPE_INTEGRAL(time_t) &&
308 TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS)
310 return _t1 - _t0 == SECSPERREPEAT;
314 tzload(const char *name, struct state * const sp, const int doextend)
322 struct tzhead tzhead;
323 char buf[2 * sizeof(struct tzhead) +
328 sp->goback = sp->goahead = FALSE;
330 /* XXX The following is from OpenBSD, and I'm not sure it is correct */
331 if (name != NULL && issetugid() != 0)
332 if ((name[0] == ':' && name[1] == '/') ||
333 name[0] == '/' || strchr(name, '.'))
335 if (name == NULL && (name = TZDEFAULT) == NULL)
341 ** Section 4.9.1 of the C standard says that
342 ** "FILENAME_MAX expands to an integral constant expression
343 ** that is the size needed for an array of char large enough
344 ** to hold the longest file name string that the implementation
345 ** guarantees can be opened."
347 char fullname[FILENAME_MAX + 1];
351 doaccess = name[0] == '/';
353 if ((p = TZDIR) == NULL)
355 if ((strlen(p) + 1 + strlen(name) + 1) >= sizeof fullname)
358 strcat(fullname, "/");
359 strcat(fullname, name);
361 ** Set doaccess if '.' (as in "../") shows up in name.
363 if (strchr(name, '.') != NULL)
367 if (doaccess && access(name, R_OK) != 0)
369 if ((fid = _open(name, O_RDONLY)) == -1)
371 if ((_fstat(fid, &stab) < 0) || !S_ISREG(stab.st_mode)) {
376 nread = read(fid, u.buf, sizeof u.buf);
377 if (close(fid) < 0 || nread <= 0)
379 for (stored = 4; stored <= 8; stored *= 2) {
383 ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt);
384 ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt);
385 sp->leapcnt = (int) detzcode(u.tzhead.tzh_leapcnt);
386 sp->timecnt = (int) detzcode(u.tzhead.tzh_timecnt);
387 sp->typecnt = (int) detzcode(u.tzhead.tzh_typecnt);
388 sp->charcnt = (int) detzcode(u.tzhead.tzh_charcnt);
389 p = u.tzhead.tzh_charcnt + sizeof u.tzhead.tzh_charcnt;
390 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS ||
391 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES ||
392 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES ||
393 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS ||
394 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) ||
395 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0))
397 if (nread - (p - u.buf) <
398 sp->timecnt * stored + /* ats */
399 sp->timecnt + /* types */
400 sp->typecnt * 6 + /* ttinfos */
401 sp->charcnt + /* chars */
402 sp->leapcnt * (stored + 4) + /* lsinfos */
403 ttisstdcnt + /* ttisstds */
404 ttisgmtcnt) /* ttisgmts */
406 for (i = 0; i < sp->timecnt; ++i) {
407 sp->ats[i] = (stored == 4) ?
408 detzcode(p) : detzcode64(p);
411 for (i = 0; i < sp->timecnt; ++i) {
412 sp->types[i] = (unsigned char) *p++;
413 if (sp->types[i] >= sp->typecnt)
416 for (i = 0; i < sp->typecnt; ++i) {
417 struct ttinfo * ttisp;
419 ttisp = &sp->ttis[i];
420 ttisp->tt_gmtoff = detzcode(p);
422 ttisp->tt_isdst = (unsigned char) *p++;
423 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1)
425 ttisp->tt_abbrind = (unsigned char) *p++;
426 if (ttisp->tt_abbrind < 0 ||
427 ttisp->tt_abbrind > sp->charcnt)
430 for (i = 0; i < sp->charcnt; ++i)
432 sp->chars[i] = '\0'; /* ensure '\0' at end */
433 for (i = 0; i < sp->leapcnt; ++i) {
434 struct lsinfo * lsisp;
436 lsisp = &sp->lsis[i];
437 lsisp->ls_trans = (stored == 4) ?
438 detzcode(p) : detzcode64(p);
440 lsisp->ls_corr = detzcode(p);
443 for (i = 0; i < sp->typecnt; ++i) {
444 struct ttinfo * ttisp;
446 ttisp = &sp->ttis[i];
448 ttisp->tt_ttisstd = FALSE;
450 ttisp->tt_ttisstd = *p++;
451 if (ttisp->tt_ttisstd != TRUE &&
452 ttisp->tt_ttisstd != FALSE)
456 for (i = 0; i < sp->typecnt; ++i) {
457 struct ttinfo * ttisp;
459 ttisp = &sp->ttis[i];
461 ttisp->tt_ttisgmt = FALSE;
463 ttisp->tt_ttisgmt = *p++;
464 if (ttisp->tt_ttisgmt != TRUE &&
465 ttisp->tt_ttisgmt != FALSE)
470 ** Out-of-sort ats should mean we're running on a
471 ** signed time_t system but using a data file with
472 ** unsigned values (or vice versa).
474 for (i = 0; i < sp->timecnt - 2; ++i)
475 if (sp->ats[i] > sp->ats[i + 1]) {
477 if (TYPE_SIGNED(time_t)) {
479 ** Ignore the end (easy).
484 ** Ignore the beginning (harder).
488 for (j = 0; j + i < sp->timecnt; ++j) {
489 sp->ats[j] = sp->ats[j + i];
490 sp->types[j] = sp->types[j + i];
497 ** If this is an old file, we're done.
499 if (u.tzhead.tzh_version[0] == '\0')
502 for (i = 0; i < nread; ++i)
505 ** If this is a narrow integer time_t system, we're done.
507 if (stored >= (int) sizeof(time_t) && TYPE_INTEGRAL(time_t))
510 if (doextend && nread > 2 &&
511 u.buf[0] == '\n' && u.buf[nread - 1] == '\n' &&
512 sp->typecnt + 2 <= TZ_MAX_TYPES) {
516 u.buf[nread - 1] = '\0';
517 result = tzparse(&u.buf[1], &ts, FALSE);
518 if (result == 0 && ts.typecnt == 2 &&
519 sp->charcnt + ts.charcnt <= TZ_MAX_CHARS) {
520 for (i = 0; i < 2; ++i)
521 ts.ttis[i].tt_abbrind +=
523 for (i = 0; i < ts.charcnt; ++i)
524 sp->chars[sp->charcnt++] =
527 while (i < ts.timecnt &&
529 sp->ats[sp->timecnt - 1])
531 while (i < ts.timecnt &&
532 sp->timecnt < TZ_MAX_TIMES) {
533 sp->ats[sp->timecnt] =
535 sp->types[sp->timecnt] =
541 sp->ttis[sp->typecnt++] = ts.ttis[0];
542 sp->ttis[sp->typecnt++] = ts.ttis[1];
545 if (sp->timecnt > 1) {
546 for (i = 1; i < sp->timecnt; ++i)
547 if (typesequiv(sp, sp->types[i], sp->types[0]) &&
548 differ_by_repeat(sp->ats[i], sp->ats[0])) {
552 for (i = sp->timecnt - 2; i >= 0; --i)
553 if (typesequiv(sp, sp->types[sp->timecnt - 1],
555 differ_by_repeat(sp->ats[sp->timecnt - 1],
565 typesequiv(const struct state * const sp, const int a, const int b)
570 a < 0 || a >= sp->typecnt ||
571 b < 0 || b >= sp->typecnt)
574 const struct ttinfo * ap = &sp->ttis[a];
575 const struct ttinfo * bp = &sp->ttis[b];
576 result = ap->tt_gmtoff == bp->tt_gmtoff &&
577 ap->tt_isdst == bp->tt_isdst &&
578 ap->tt_ttisstd == bp->tt_ttisstd &&
579 ap->tt_ttisgmt == bp->tt_ttisgmt &&
580 strcmp(&sp->chars[ap->tt_abbrind],
581 &sp->chars[bp->tt_abbrind]) == 0;
586 static const int mon_lengths[2][MONSPERYEAR] = {
587 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
588 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
591 static const int year_lengths[2] = {
592 DAYSPERNYEAR, DAYSPERLYEAR
596 ** Given a pointer into a time zone string, scan until a character that is not
597 ** a valid character in a zone name is found. Return a pointer to that
602 getzname(const char *strp)
606 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' &&
613 ** Given a pointer into an extended time zone string, scan until the ending
614 ** delimiter of the zone name is located. Return a pointer to the delimiter.
616 ** As with getzname above, the legal character set is actually quite
617 ** restricted, with other characters producing undefined results.
618 ** We don't do any checking here; checking is done later in common-case code.
622 getqzname(const char *strp, const int delim)
626 while ((c = *strp) != '\0' && c != delim)
632 ** Given a pointer into a time zone string, extract a number from that string.
633 ** Check that the number is within a specified range; if it is not, return
635 ** Otherwise, return a pointer to the first character not part of the number.
639 getnum(const char *strp, int * const nump, const int min, const int max)
644 if (strp == NULL || !is_digit(c = *strp))
648 num = num * 10 + (c - '0');
650 return NULL; /* illegal value */
652 } while (is_digit(c));
654 return NULL; /* illegal value */
660 ** Given a pointer into a time zone string, extract a number of seconds,
661 ** in hh[:mm[:ss]] form, from the string.
662 ** If any error occurs, return NULL.
663 ** Otherwise, return a pointer to the first character not part of the number
668 getsecs(const char *strp, long * const secsp)
673 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like
674 ** "M10.4.6/26", which does not conform to Posix,
675 ** but which specifies the equivalent of
676 ** ``02:00 on the first Sunday on or after 23 Oct''.
678 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1);
681 *secsp = num * (long) SECSPERHOUR;
684 strp = getnum(strp, &num, 0, MINSPERHOUR - 1);
687 *secsp += num * SECSPERMIN;
690 /* `SECSPERMIN' allows for leap seconds. */
691 strp = getnum(strp, &num, 0, SECSPERMIN);
701 ** Given a pointer into a time zone string, extract an offset, in
702 ** [+-]hh[:mm[:ss]] form, from the string.
703 ** If any error occurs, return NULL.
704 ** Otherwise, return a pointer to the first character not part of the time.
708 getoffset(const char *strp, long * const offsetp)
715 } else if (*strp == '+')
717 strp = getsecs(strp, offsetp);
719 return NULL; /* illegal time */
721 *offsetp = -*offsetp;
726 ** Given a pointer into a time zone string, extract a rule in the form
727 ** date[/time]. See POSIX section 8 for the format of "date" and "time".
728 ** If a valid rule is not found, return NULL.
729 ** Otherwise, return a pointer to the first character not part of the rule.
733 getrule(const char *strp, struct rule * const rulep)
739 rulep->r_type = JULIAN_DAY;
741 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR);
742 } else if (*strp == 'M') {
746 rulep->r_type = MONTH_NTH_DAY_OF_WEEK;
748 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR);
753 strp = getnum(strp, &rulep->r_week, 1, 5);
758 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1);
759 } else if (is_digit(*strp)) {
763 rulep->r_type = DAY_OF_YEAR;
764 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1);
765 } else return NULL; /* invalid format */
773 strp = getsecs(strp, &rulep->r_time);
774 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */
779 ** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the
780 ** year, a rule, and the offset from UTC at the time that rule takes effect,
781 ** calculate the Epoch-relative time that rule takes effect.
785 transtime(const time_t janfirst, const int year,
786 const struct rule * const rulep, const long offset)
791 int d, m1, yy0, yy1, yy2, dow;
794 leapyear = isleap(year);
795 switch (rulep->r_type) {
799 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap
801 ** In non-leap years, or if the day number is 59 or less, just
802 ** add SECSPERDAY times the day number-1 to the time of
803 ** January 1, midnight, to get the day.
805 value = janfirst + (rulep->r_day - 1) * SECSPERDAY;
806 if (leapyear && rulep->r_day >= 60)
813 ** Just add SECSPERDAY times the day number to the time of
814 ** January 1, midnight, to get the day.
816 value = janfirst + rulep->r_day * SECSPERDAY;
819 case MONTH_NTH_DAY_OF_WEEK:
821 ** Mm.n.d - nth "dth day" of month m.
824 for (i = 0; i < rulep->r_mon - 1; ++i)
825 value += mon_lengths[leapyear][i] * SECSPERDAY;
828 ** Use Zeller's Congruence to get day-of-week of first day of
831 m1 = (rulep->r_mon + 9) % 12 + 1;
832 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year;
835 dow = ((26 * m1 - 2) / 10 +
836 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7;
841 ** "dow" is the day-of-week of the first day of the month. Get
842 ** the day-of-month (zero-origin) of the first "dow" day of the
845 d = rulep->r_day - dow;
848 for (i = 1; i < rulep->r_week; ++i) {
849 if (d + DAYSPERWEEK >=
850 mon_lengths[leapyear][rulep->r_mon - 1])
856 ** "d" is the day-of-month (zero-origin) of the day we want.
858 value += d * SECSPERDAY;
863 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in
864 ** question. To get the Epoch-relative time of the specified local
865 ** time on that day, add the transition time and the current offset
868 return value + rulep->r_time + offset;
872 ** Given a POSIX section 8-style TZ string, fill in the rule tables as
877 tzparse(const char *name, struct state * const sp, const int lastditch)
879 const char * stdname;
880 const char * dstname;
886 unsigned char * typep;
889 static struct ttinfo zttinfo;
894 stdlen = strlen(name); /* length of standard zone name */
896 if (stdlen >= sizeof sp->chars)
897 stdlen = (sizeof sp->chars) - 1;
903 name = getqzname(name, '>');
906 stdlen = name - stdname;
909 name = getzname(name);
910 stdlen = name - stdname;
914 name = getoffset(name, &stdoffset);
918 load_result = tzload(TZDEFRULES, sp, FALSE);
919 if (load_result != 0)
920 sp->leapcnt = 0; /* so, we're off a little */
924 name = getqzname(name, '>');
927 dstlen = name - dstname;
931 name = getzname(name);
932 dstlen = name - dstname; /* length of DST zone name */
934 if (*name != '\0' && *name != ',' && *name != ';') {
935 name = getoffset(name, &dstoffset);
938 } else dstoffset = stdoffset - SECSPERHOUR;
939 if (*name == '\0' && load_result != 0)
940 name = TZDEFRULESTRING;
941 if (*name == ',' || *name == ';') {
950 if ((name = getrule(name, &start)) == NULL)
954 if ((name = getrule(name, &end)) == NULL)
958 sp->typecnt = 2; /* standard time and DST */
960 ** Two transitions per year, from EPOCH_YEAR forward.
962 sp->ttis[0] = sp->ttis[1] = zttinfo;
963 sp->ttis[0].tt_gmtoff = -dstoffset;
964 sp->ttis[0].tt_isdst = 1;
965 sp->ttis[0].tt_abbrind = stdlen + 1;
966 sp->ttis[1].tt_gmtoff = -stdoffset;
967 sp->ttis[1].tt_isdst = 0;
968 sp->ttis[1].tt_abbrind = 0;
973 for (year = EPOCH_YEAR;
974 sp->timecnt + 2 <= TZ_MAX_TIMES;
978 starttime = transtime(janfirst, year, &start,
980 endtime = transtime(janfirst, year, &end,
982 if (starttime > endtime) {
984 *typep++ = 1; /* DST ends */
986 *typep++ = 0; /* DST begins */
989 *typep++ = 0; /* DST begins */
991 *typep++ = 1; /* DST ends */
995 newfirst += year_lengths[isleap(year)] *
997 if (newfirst <= janfirst)
1002 long theirstdoffset;
1003 long theirdstoffset;
1012 ** Initial values of theirstdoffset and theirdstoffset.
1015 for (i = 0; i < sp->timecnt; ++i) {
1017 if (!sp->ttis[j].tt_isdst) {
1019 -sp->ttis[j].tt_gmtoff;
1024 for (i = 0; i < sp->timecnt; ++i) {
1026 if (sp->ttis[j].tt_isdst) {
1028 -sp->ttis[j].tt_gmtoff;
1033 ** Initially we're assumed to be in standard time.
1036 theiroffset = theirstdoffset;
1038 ** Now juggle transition times and types
1039 ** tracking offsets as you do.
1041 for (i = 0; i < sp->timecnt; ++i) {
1043 sp->types[i] = sp->ttis[j].tt_isdst;
1044 if (sp->ttis[j].tt_ttisgmt) {
1045 /* No adjustment to transition time */
1048 ** If summer time is in effect, and the
1049 ** transition time was not specified as
1050 ** standard time, add the summer time
1051 ** offset to the transition time;
1052 ** otherwise, add the standard time
1053 ** offset to the transition time.
1056 ** Transitions from DST to DDST
1057 ** will effectively disappear since
1058 ** POSIX provides for only one DST
1061 if (isdst && !sp->ttis[j].tt_ttisstd) {
1062 sp->ats[i] += dstoffset -
1065 sp->ats[i] += stdoffset -
1069 theiroffset = -sp->ttis[j].tt_gmtoff;
1070 if (sp->ttis[j].tt_isdst)
1071 theirdstoffset = theiroffset;
1072 else theirstdoffset = theiroffset;
1075 ** Finally, fill in ttis.
1077 sp->ttis[0] = sp->ttis[1] = zttinfo;
1078 sp->ttis[0].tt_gmtoff = -stdoffset;
1079 sp->ttis[0].tt_isdst = FALSE;
1080 sp->ttis[0].tt_abbrind = 0;
1081 sp->ttis[1].tt_gmtoff = -dstoffset;
1082 sp->ttis[1].tt_isdst = TRUE;
1083 sp->ttis[1].tt_abbrind = stdlen + 1;
1088 sp->typecnt = 1; /* only standard time */
1090 sp->ttis[0] = zttinfo;
1091 sp->ttis[0].tt_gmtoff = -stdoffset;
1092 sp->ttis[0].tt_isdst = 0;
1093 sp->ttis[0].tt_abbrind = 0;
1095 sp->charcnt = stdlen + 1;
1097 sp->charcnt += dstlen + 1;
1098 if ((size_t) sp->charcnt > sizeof sp->chars)
1101 strncpy(cp, stdname, stdlen);
1105 strncpy(cp, dstname, dstlen);
1106 *(cp + dstlen) = '\0';
1112 gmtload(struct state * const sp)
1114 if (tzload(gmt, sp, TRUE) != 0)
1115 tzparse(gmt, sp, TRUE);
1119 tzsetwall_basic(int rdlocked)
1122 _RWLOCK_RDLOCK(&lcl_rwlock);
1123 if (lcl_is_set < 0) {
1125 _RWLOCK_UNLOCK(&lcl_rwlock);
1128 _RWLOCK_UNLOCK(&lcl_rwlock);
1130 _RWLOCK_WRLOCK(&lcl_rwlock);
1133 if (tzload(NULL, lclptr, TRUE) != 0)
1136 _RWLOCK_UNLOCK(&lcl_rwlock);
1139 _RWLOCK_RDLOCK(&lcl_rwlock);
1149 tzset_basic(int rdlocked)
1153 name = getenv("TZ");
1155 tzsetwall_basic(rdlocked);
1160 _RWLOCK_RDLOCK(&lcl_rwlock);
1161 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) {
1163 _RWLOCK_UNLOCK(&lcl_rwlock);
1166 _RWLOCK_UNLOCK(&lcl_rwlock);
1168 _RWLOCK_WRLOCK(&lcl_rwlock);
1169 lcl_is_set = strlen(name) < sizeof lcl_TZname;
1171 strcpy(lcl_TZname, name);
1173 if (*name == '\0') {
1175 ** User wants it fast rather than right.
1177 lclptr->leapcnt = 0; /* so, we're off a little */
1178 lclptr->timecnt = 0;
1179 lclptr->typecnt = 0;
1180 lclptr->ttis[0].tt_isdst = 0;
1181 lclptr->ttis[0].tt_gmtoff = 0;
1182 lclptr->ttis[0].tt_abbrind = 0;
1183 strcpy(lclptr->chars, gmt);
1184 } else if (tzload(name, lclptr, TRUE) != 0)
1185 if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0)
1188 _RWLOCK_UNLOCK(&lcl_rwlock);
1191 _RWLOCK_RDLOCK(&lcl_rwlock);
1201 ** The easy way to behave "as if no library function calls" localtime
1202 ** is to not call it--so we drop its guts into "localsub", which can be
1203 ** freely called. (And no, the PANS doesn't require the above behavior--
1204 ** but it *is* desirable.)
1206 ** The unused offset argument is for the benefit of mktime variants.
1211 localsub(const time_t * const timep, const long offset __unused,
1212 struct tm * const tmp)
1215 const struct ttinfo * ttisp;
1218 const time_t t = *timep;
1222 if ((sp->goback && t < sp->ats[0]) ||
1223 (sp->goahead && t > sp->ats[sp->timecnt - 1])) {
1227 int_fast64_t icycles;
1230 seconds = sp->ats[0] - t;
1231 else seconds = t - sp->ats[sp->timecnt - 1];
1233 tcycles = seconds / YEARSPERREPEAT / AVGSECSPERYEAR;
1236 if (tcycles - icycles >= 1 || icycles - tcycles >= 1)
1239 seconds *= YEARSPERREPEAT;
1240 seconds *= AVGSECSPERYEAR;
1243 else newt -= seconds;
1244 if (newt < sp->ats[0] ||
1245 newt > sp->ats[sp->timecnt - 1])
1246 return NULL; /* "cannot happen" */
1247 result = localsub(&newt, offset, tmp);
1248 if (result == tmp) {
1251 newy = tmp->tm_year;
1253 newy -= icycles * YEARSPERREPEAT;
1254 else newy += icycles * YEARSPERREPEAT;
1255 tmp->tm_year = newy;
1256 if (tmp->tm_year != newy)
1261 if (sp->timecnt == 0 || t < sp->ats[0]) {
1263 while (sp->ttis[i].tt_isdst)
1264 if (++i >= sp->typecnt) {
1270 int hi = sp->timecnt;
1273 int mid = (lo + hi) >> 1;
1275 if (t < sp->ats[mid])
1279 i = (int) sp->types[lo - 1];
1281 ttisp = &sp->ttis[i];
1283 ** To get (wrong) behavior that's compatible with System V Release 2.0
1284 ** you'd replace the statement below with
1285 ** t += ttisp->tt_gmtoff;
1286 ** timesub(&t, 0L, sp, tmp);
1288 result = timesub(&t, ttisp->tt_gmtoff, sp, tmp);
1289 tmp->tm_isdst = ttisp->tt_isdst;
1290 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind];
1292 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind];
1293 #endif /* defined TM_ZONE */
1298 localtime_r(const time_t * const timep, struct tm *p_tm)
1300 _RWLOCK_RDLOCK(&lcl_rwlock);
1302 localsub(timep, 0L, p_tm);
1303 _RWLOCK_UNLOCK(&lcl_rwlock);
1308 localtime(const time_t * const timep)
1310 static pthread_mutex_t localtime_mutex = PTHREAD_MUTEX_INITIALIZER;
1311 static pthread_key_t localtime_key = -1;
1314 if (__isthreaded != 0) {
1315 if (localtime_key < 0) {
1316 _pthread_mutex_lock(&localtime_mutex);
1317 if (localtime_key < 0) {
1318 if (_pthread_key_create(&localtime_key, free) < 0) {
1319 _pthread_mutex_unlock(&localtime_mutex);
1323 _pthread_mutex_unlock(&localtime_mutex);
1325 p_tm = _pthread_getspecific(localtime_key);
1327 if ((p_tm = (struct tm *)malloc(sizeof(struct tm)))
1330 _pthread_setspecific(localtime_key, p_tm);
1332 _RWLOCK_RDLOCK(&lcl_rwlock);
1334 localsub(timep, 0L, p_tm);
1335 _RWLOCK_UNLOCK(&lcl_rwlock);
1339 localsub(timep, 0L, &tm);
1345 ** gmtsub is to gmtime as localsub is to localtime.
1349 gmtsub(const time_t * const timep, const long offset, struct tm * const tmp)
1354 _MUTEX_LOCK(&gmt_mutex);
1359 _MUTEX_UNLOCK(&gmt_mutex);
1361 result = timesub(timep, offset, gmtptr, tmp);
1364 ** Could get fancy here and deliver something such as
1365 ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero,
1366 ** but this is no time for a treasure hunt.
1369 tmp->TM_ZONE = wildabbr;
1371 tmp->TM_ZONE = gmtptr->chars;
1372 #endif /* defined TM_ZONE */
1377 gmtime(const time_t * const timep)
1379 static pthread_mutex_t gmtime_mutex = PTHREAD_MUTEX_INITIALIZER;
1380 static pthread_key_t gmtime_key = -1;
1383 if (__isthreaded != 0) {
1384 if (gmtime_key < 0) {
1385 _pthread_mutex_lock(&gmtime_mutex);
1386 if (gmtime_key < 0) {
1387 if (_pthread_key_create(&gmtime_key, free) < 0) {
1388 _pthread_mutex_unlock(&gmtime_mutex);
1392 _pthread_mutex_unlock(&gmtime_mutex);
1395 * Changed to follow POSIX.1 threads standard, which
1396 * is what BSD currently has.
1398 if ((p_tm = _pthread_getspecific(gmtime_key)) == NULL) {
1399 if ((p_tm = (struct tm *)malloc(sizeof(struct tm)))
1403 _pthread_setspecific(gmtime_key, p_tm);
1405 return gmtsub(timep, 0L, p_tm);
1407 return gmtsub(timep, 0L, &tm);
1412 gmtime_r(const time_t * timep, struct tm * tmp)
1414 return gmtsub(timep, 0L, tmp);
1418 offtime(const time_t * const timep, const long offset)
1420 return gmtsub(timep, offset, &tm);
1424 ** Return the number of leap years through the end of the given year
1425 ** where, to make the math easy, the answer for year zero is defined as zero.
1429 leaps_thru_end_of(const int y)
1431 return (y >= 0) ? (y / 4 - y / 100 + y / 400) :
1432 -(leaps_thru_end_of(-(y + 1)) + 1);
1436 timesub(const time_t * const timep, const long offset,
1437 const struct state * const sp, struct tm * const tmp)
1439 const struct lsinfo * lp;
1441 int idays; /* unsigned would be so 2003 */
1456 if (*timep >= lp->ls_trans) {
1457 if (*timep == lp->ls_trans) {
1458 hit = ((i == 0 && lp->ls_corr > 0) ||
1459 lp->ls_corr > sp->lsis[i - 1].ls_corr);
1462 sp->lsis[i].ls_trans ==
1463 sp->lsis[i - 1].ls_trans + 1 &&
1464 sp->lsis[i].ls_corr ==
1465 sp->lsis[i - 1].ls_corr + 1) {
1475 tdays = *timep / SECSPERDAY;
1476 rem = *timep - tdays * SECSPERDAY;
1477 while (tdays < 0 || tdays >= year_lengths[isleap(y)]) {
1483 tdelta = tdays / DAYSPERLYEAR;
1485 if (tdelta - idelta >= 1 || idelta - tdelta >= 1)
1488 idelta = (tdays < 0) ? -1 : 1;
1490 if (increment_overflow(&newy, idelta))
1492 leapdays = leaps_thru_end_of(newy - 1) -
1493 leaps_thru_end_of(y - 1);
1494 tdays -= ((time_t) newy - y) * DAYSPERNYEAR;
1501 seconds = tdays * SECSPERDAY + 0.5;
1502 tdays = seconds / SECSPERDAY;
1503 rem += seconds - tdays * SECSPERDAY;
1506 ** Given the range, we can now fearlessly cast...
1509 rem += offset - corr;
1514 while (rem >= SECSPERDAY) {
1519 if (increment_overflow(&y, -1))
1521 idays += year_lengths[isleap(y)];
1523 while (idays >= year_lengths[isleap(y)]) {
1524 idays -= year_lengths[isleap(y)];
1525 if (increment_overflow(&y, 1))
1529 if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE))
1531 tmp->tm_yday = idays;
1533 ** The "extra" mods below avoid overflow problems.
1535 tmp->tm_wday = EPOCH_WDAY +
1536 ((y - EPOCH_YEAR) % DAYSPERWEEK) *
1537 (DAYSPERNYEAR % DAYSPERWEEK) +
1538 leaps_thru_end_of(y - 1) -
1539 leaps_thru_end_of(EPOCH_YEAR - 1) +
1541 tmp->tm_wday %= DAYSPERWEEK;
1542 if (tmp->tm_wday < 0)
1543 tmp->tm_wday += DAYSPERWEEK;
1544 tmp->tm_hour = (int) (rem / SECSPERHOUR);
1546 tmp->tm_min = (int) (rem / SECSPERMIN);
1548 ** A positive leap second requires a special
1549 ** representation. This uses "... ??:59:60" et seq.
1551 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit;
1552 ip = mon_lengths[isleap(y)];
1553 for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon))
1554 idays -= ip[tmp->tm_mon];
1555 tmp->tm_mday = (int) (idays + 1);
1558 tmp->TM_GMTOFF = offset;
1559 #endif /* defined TM_GMTOFF */
1564 ctime(const time_t * const timep)
1567 ** Section 4.12.3.2 of X3.159-1989 requires that
1568 ** The ctime function converts the calendar time pointed to by timer
1569 ** to local time in the form of a string. It is equivalent to
1570 ** asctime(localtime(timer))
1572 return asctime(localtime(timep));
1576 ctime_r(const time_t * const timep, char *buf)
1579 return asctime_r(localtime_r(timep, &mytm), buf);
1583 ** Adapted from code provided by Robert Elz, who writes:
1584 ** The "best" way to do mktime I think is based on an idea of Bob
1585 ** Kridle's (so its said...) from a long time ago.
1586 ** It does a binary search of the time_t space. Since time_t's are
1587 ** just 32 bits, its a max of 32 iterations (even at 64 bits it
1588 ** would still be very reasonable).
1593 #endif /* !defined WRONG */
1596 ** Simplified normalize logic courtesy Paul Eggert.
1600 increment_overflow(int *number, int delta)
1606 return (*number < number0) != (delta < 0);
1610 long_increment_overflow(long *number, int delta)
1616 return (*number < number0) != (delta < 0);
1620 normalize_overflow(int * const tensptr, int * const unitsptr, const int base)
1624 tensdelta = (*unitsptr >= 0) ?
1625 (*unitsptr / base) :
1626 (-1 - (-1 - *unitsptr) / base);
1627 *unitsptr -= tensdelta * base;
1628 return increment_overflow(tensptr, tensdelta);
1632 long_normalize_overflow(long * const tensptr, int * const unitsptr,
1637 tensdelta = (*unitsptr >= 0) ?
1638 (*unitsptr / base) :
1639 (-1 - (-1 - *unitsptr) / base);
1640 *unitsptr -= tensdelta * base;
1641 return long_increment_overflow(tensptr, tensdelta);
1645 tmcomp(const struct tm * const atmp, const struct tm * const btmp)
1649 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 &&
1650 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 &&
1651 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 &&
1652 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 &&
1653 (result = (atmp->tm_min - btmp->tm_min)) == 0)
1654 result = atmp->tm_sec - btmp->tm_sec;
1659 time2sub(struct tm * const tmp,
1660 struct tm * (* const funcp)(const time_t *, long, struct tm *),
1661 const long offset, int * const okayp, const int do_norm_secs)
1663 const struct state * sp;
1673 struct tm yourtm, mytm;
1678 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec,
1682 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR))
1684 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY))
1687 if (long_normalize_overflow(&y, &yourtm.tm_mon, MONSPERYEAR))
1690 ** Turn y into an actual year number for now.
1691 ** It is converted back to an offset from TM_YEAR_BASE later.
1693 if (long_increment_overflow(&y, TM_YEAR_BASE))
1695 while (yourtm.tm_mday <= 0) {
1696 if (long_increment_overflow(&y, -1))
1698 li = y + (1 < yourtm.tm_mon);
1699 yourtm.tm_mday += year_lengths[isleap(li)];
1701 while (yourtm.tm_mday > DAYSPERLYEAR) {
1702 li = y + (1 < yourtm.tm_mon);
1703 yourtm.tm_mday -= year_lengths[isleap(li)];
1704 if (long_increment_overflow(&y, 1))
1708 i = mon_lengths[isleap(y)][yourtm.tm_mon];
1709 if (yourtm.tm_mday <= i)
1711 yourtm.tm_mday -= i;
1712 if (++yourtm.tm_mon >= MONSPERYEAR) {
1714 if (long_increment_overflow(&y, 1))
1718 if (long_increment_overflow(&y, -TM_YEAR_BASE))
1721 if (yourtm.tm_year != y)
1723 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN)
1725 else if (y + TM_YEAR_BASE < EPOCH_YEAR) {
1727 ** We can't set tm_sec to 0, because that might push the
1728 ** time below the minimum representable time.
1729 ** Set tm_sec to 59 instead.
1730 ** This assumes that the minimum representable time is
1731 ** not in the same minute that a leap second was deleted from,
1732 ** which is a safer assumption than using 58 would be.
1734 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN))
1736 saved_seconds = yourtm.tm_sec;
1737 yourtm.tm_sec = SECSPERMIN - 1;
1739 saved_seconds = yourtm.tm_sec;
1743 ** Do a binary search (this works whatever time_t's type is).
1745 if (!TYPE_SIGNED(time_t)) {
1748 } else if (!TYPE_INTEGRAL(time_t)) {
1749 if (sizeof(time_t) > sizeof(float))
1750 hi = (time_t) DBL_MAX;
1751 else hi = (time_t) FLT_MAX;
1755 for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i)
1760 t = lo / 2 + hi / 2;
1765 if ((*funcp)(&t, offset, &mytm) == NULL) {
1767 ** Assume that t is too extreme to be represented in
1768 ** a struct tm; arrange things so that it is less
1769 ** extreme on the next pass.
1771 dir = (t > 0) ? 1 : -1;
1772 } else dir = tmcomp(&mytm, &yourtm);
1779 } else if (t == hi) {
1792 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst)
1795 ** Right time, wrong type.
1796 ** Hunt for right time, right type.
1797 ** It's okay to guess wrong since the guess
1800 sp = (const struct state *)
1801 ((funcp == localsub) ? lclptr : gmtptr);
1803 for (i = sp->typecnt - 1; i >= 0; --i) {
1804 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst)
1806 for (j = sp->typecnt - 1; j >= 0; --j) {
1807 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst)
1809 newt = t + sp->ttis[j].tt_gmtoff -
1810 sp->ttis[i].tt_gmtoff;
1811 if ((*funcp)(&newt, offset, &mytm) == NULL)
1813 if (tmcomp(&mytm, &yourtm) != 0)
1815 if (mytm.tm_isdst != yourtm.tm_isdst)
1827 newt = t + saved_seconds;
1828 if ((newt < t) != (saved_seconds < 0))
1831 if ((*funcp)(&t, offset, tmp))
1837 time2(struct tm * const tmp,
1838 struct tm * (* const funcp)(const time_t *, long, struct tm *),
1839 const long offset, int * const okayp)
1844 ** First try without normalization of seconds
1845 ** (in case tm_sec contains a value associated with a leap second).
1846 ** If that fails, try with normalization of seconds.
1848 t = time2sub(tmp, funcp, offset, okayp, FALSE);
1849 return *okayp ? t : time2sub(tmp, funcp, offset, okayp, TRUE);
1853 time1(struct tm * const tmp,
1854 struct tm * (* const funcp)(const time_t *, long, struct tm *),
1858 const struct state * sp;
1860 int sameind, otherind;
1863 int seen[TZ_MAX_TYPES];
1864 int types[TZ_MAX_TYPES];
1871 if (tmp->tm_isdst > 1)
1873 t = time2(tmp, funcp, offset, &okay);
1876 ** PCTS code courtesy Grant Sullivan.
1880 if (tmp->tm_isdst < 0)
1881 tmp->tm_isdst = 0; /* reset to std and try again */
1884 ** We're supposed to assume that somebody took a time of one type
1885 ** and did some math on it that yielded a "struct tm" that's bad.
1886 ** We try to divine the type they started from and adjust to the
1889 sp = (const struct state *) ((funcp == localsub) ? lclptr : gmtptr);
1891 for (i = 0; i < sp->typecnt; ++i)
1894 for (i = sp->timecnt - 1; i >= 0; --i)
1895 if (!seen[sp->types[i]]) {
1896 seen[sp->types[i]] = TRUE;
1897 types[nseen++] = sp->types[i];
1899 for (sameind = 0; sameind < nseen; ++sameind) {
1900 samei = types[sameind];
1901 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst)
1903 for (otherind = 0; otherind < nseen; ++otherind) {
1904 otheri = types[otherind];
1905 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst)
1907 tmp->tm_sec += sp->ttis[otheri].tt_gmtoff -
1908 sp->ttis[samei].tt_gmtoff;
1909 tmp->tm_isdst = !tmp->tm_isdst;
1910 t = time2(tmp, funcp, offset, &okay);
1913 tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff -
1914 sp->ttis[samei].tt_gmtoff;
1915 tmp->tm_isdst = !tmp->tm_isdst;
1922 mktime(struct tm * const tmp)
1924 time_t mktime_return_value;
1925 _RWLOCK_RDLOCK(&lcl_rwlock);
1927 mktime_return_value = time1(tmp, localsub, 0L);
1928 _RWLOCK_UNLOCK(&lcl_rwlock);
1929 return(mktime_return_value);
1933 timelocal(struct tm * const tmp)
1936 tmp->tm_isdst = -1; /* in case it wasn't initialized */
1941 timegm(struct tm * const tmp)
1945 return time1(tmp, gmtsub, 0L);
1949 timeoff(struct tm * const tmp, const long offset)
1953 return time1(tmp, gmtsub, offset);
1959 ** The following is supplied for compatibility with
1960 ** previous versions of the CMUCS runtime library.
1964 gtime(struct tm * const tmp)
1966 const time_t t = mktime(tmp);
1973 #endif /* defined CMUCS */
1976 ** XXX--is the below the right way to conditionalize??
1980 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599
1981 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which
1982 ** is not the case if we are accounting for leap seconds.
1983 ** So, we provide the following conversion routines for use
1984 ** when exchanging timestamps with POSIX conforming systems.
1988 leapcorr(time_t *timep)
1998 if (*timep >= lp->ls_trans)
2005 time2posix(time_t t)
2008 return t - leapcorr(&t);
2012 posix2time(time_t t)
2019 ** For a positive leap second hit, the result
2020 ** is not unique. For a negative leap second
2021 ** hit, the corresponding time doesn't exist,
2022 ** so we return an adjacent second.
2024 x = t + leapcorr(&t);
2025 y = x - leapcorr(&x);
2029 y = x - leapcorr(&x);
2036 y = x - leapcorr(&x);