2 ** This file is in the public domain, so clarified as of
3 ** 1996-06-05 by Arthur David Olson.
6 ** $FreeBSD: src/lib/libc/stdtime/localtime.c,v 1.25.2.2 2002/08/13 16:08:07 bmilekic Exp $
7 ** $DragonFly: src/lib/libc/stdtime/localtime.c,v 1.7 2008/10/19 20:15:58 swildner Exp $
11 ** Leap second handling from Bradley White.
12 ** POSIX-style TZ environment variable handling from Guy Harris.
17 #include "namespace.h"
18 #include <sys/types.h>
22 #include <float.h> /* for FLT_MAX and DBL_MAX */
26 #include <un-namespace.h>
30 #include "libc_private.h"
32 #define _MUTEX_LOCK(x) if (__isthreaded) _pthread_mutex_lock(x)
33 #define _MUTEX_UNLOCK(x) if (__isthreaded) _pthread_mutex_unlock(x)
35 #define _RWLOCK_RDLOCK(x) \
37 if (__isthreaded) _pthread_rwlock_rdlock(x); \
40 #define _RWLOCK_WRLOCK(x) \
42 if (__isthreaded) _pthread_rwlock_wrlock(x); \
45 #define _RWLOCK_UNLOCK(x) \
47 if (__isthreaded) _pthread_rwlock_unlock(x); \
50 #ifndef TZ_ABBR_MAX_LEN
51 #define TZ_ABBR_MAX_LEN 16
52 #endif /* !defined TZ_ABBR_MAX_LEN */
54 #ifndef TZ_ABBR_CHAR_SET
55 #define TZ_ABBR_CHAR_SET \
56 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._"
57 #endif /* !defined TZ_ABBR_CHAR_SET */
59 #ifndef TZ_ABBR_ERR_CHAR
60 #define TZ_ABBR_ERR_CHAR '_'
61 #endif /* !defined TZ_ABBR_ERR_CHAR */
64 ** Someone might make incorrect use of a time zone abbreviation:
65 ** 1. They might reference tzname[0] before calling tzset (explicitly
67 ** 2. They might reference tzname[1] before calling tzset (explicitly
69 ** 3. They might reference tzname[1] after setting to a time zone
70 ** in which Daylight Saving Time is never observed.
71 ** 4. They might reference tzname[0] after setting to a time zone
72 ** in which Standard Time is never observed.
73 ** 5. They might reference tm.TM_ZONE after calling offtime.
74 ** What's best to do in the above cases is open to debate;
75 ** for now, we just set things up so that in any of the five cases
76 ** WILDABBR is used. Another possibility: initialize tzname[0] to the
77 ** string "tzname[0] used before set", and similarly for the other cases.
78 ** And another: initialize tzname[0] to "ERA", with an explanation in the
79 ** manual page of what this "time zone abbreviation" means (doing this so
80 ** that tzname[0] has the "normal" length of three characters).
84 static char wildabbr[] = WILDABBR;
86 static const char gmt[] = "UTC";
89 ** The DST rules to use if TZ has no rules and we can't load TZDEFRULES.
90 ** We default to US rules as of 1999-08-17.
91 ** POSIX 1003.1 section 8.1.1 says that the default DST rules are
92 ** implementation dependent; for historical reasons, US rules are a
95 #ifndef TZDEFRULESTRING
96 #define TZDEFRULESTRING ",M4.1.0,M10.5.0"
97 #endif /* !defined TZDEFDST */
99 struct ttinfo { /* time type information */
100 long tt_gmtoff; /* UTC offset in seconds */
101 int tt_isdst; /* used to set tm_isdst */
102 int tt_abbrind; /* abbreviation list index */
103 int tt_ttisstd; /* TRUE if transition is std time */
104 int tt_ttisgmt; /* TRUE if transition is UTC */
107 struct lsinfo { /* leap second information */
108 time_t ls_trans; /* transition time */
109 long ls_corr; /* correction to apply */
112 #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b))
115 #define MY_TZNAME_MAX TZNAME_MAX
116 #endif /* defined TZNAME_MAX */
118 #define MY_TZNAME_MAX 255
119 #endif /* !defined TZNAME_MAX */
128 time_t ats[TZ_MAX_TIMES];
129 unsigned char types[TZ_MAX_TIMES];
130 struct ttinfo ttis[TZ_MAX_TYPES];
131 char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt),
132 (2 * (MY_TZNAME_MAX + 1)))];
133 struct lsinfo lsis[TZ_MAX_LEAPS];
137 int r_type; /* type of rule--see below */
138 int r_day; /* day number of rule */
139 int r_week; /* week number of rule */
140 int r_mon; /* month number of rule */
141 long r_time; /* transition time of rule */
144 #define JULIAN_DAY 0 /* Jn - Julian day */
145 #define DAY_OF_YEAR 1 /* n - day of year */
146 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */
149 ** Prototypes for static functions.
152 static long detzcode(const char * codep);
153 static time_t detzcode64(const char * codep);
154 static int differ_by_repeat(time_t t1, time_t t0);
155 static const char * getzname(const char * strp);
156 static const char * getqzname(const char * strp, const int delim);
157 static const char * getnum(const char * strp, int * nump, int min,
159 static const char * getsecs(const char * strp, long * secsp);
160 static const char * getoffset(const char * strp, long * offsetp);
161 static const char * getrule(const char * strp, struct rule * rulep);
162 static void gmtload(struct state * sp);
163 static struct tm * gmtsub(const time_t * timep, long offset,
165 static struct tm * localsub(const time_t * timep, long offset,
167 static int increment_overflow(int * number, int delta);
168 static int leaps_thru_end_of(int y);
169 static int long_increment_overflow(long * number, int delta);
170 static int long_normalize_overflow(long * tensptr,
171 int * unitsptr, int base);
172 static int normalize_overflow(int * tensptr, int * unitsptr,
174 static void settzname(void);
175 static time_t time1(struct tm * tmp,
176 struct tm * (*funcp)(const time_t *,
179 static time_t time2(struct tm *tmp,
180 struct tm * (*funcp)(const time_t *,
182 long offset, int * okayp);
183 static time_t time2sub(struct tm *tmp,
184 struct tm * (*funcp)(const time_t *,
186 long offset, int * okayp, int do_norm_secs);
187 static struct tm * timesub(const time_t * timep, long offset,
188 const struct state * sp, struct tm * tmp);
189 static int tmcomp(const struct tm * atmp,
190 const struct tm * btmp);
191 static time_t transtime(time_t janfirst, int year,
192 const struct rule * rulep, long offset);
193 static int typesequiv(const struct state * sp, int a, int b);
194 static int tzload(const char * name, struct state * sp,
196 static int tzparse(const char * name, struct state * sp,
199 static struct state lclmem;
200 static struct state gmtmem;
201 #define lclptr (&lclmem)
202 #define gmtptr (&gmtmem)
204 #ifndef TZ_STRLEN_MAX
205 #define TZ_STRLEN_MAX 255
206 #endif /* !defined TZ_STRLEN_MAX */
208 static char lcl_TZname[TZ_STRLEN_MAX + 1];
209 static int lcl_is_set;
210 static int gmt_is_set;
211 static pthread_rwlock_t lcl_rwlock = PTHREAD_RWLOCK_INITIALIZER;
212 static pthread_mutex_t gmt_mutex = PTHREAD_MUTEX_INITIALIZER;
220 ** Section 4.12.3 of X3.159-1989 requires that
221 ** Except for the strftime function, these functions [asctime,
222 ** ctime, gmtime, localtime] return values in one of two static
223 ** objects: a broken-down time structure and an array of char.
224 ** Thanks to Paul Eggert for noting this.
233 detzcode(const char * const codep)
238 result = (codep[0] & 0x80) ? ~0L : 0;
239 for (i = 0; i < 4; ++i)
240 result = (result << 8) | (codep[i] & 0xff);
245 detzcode64(const char * const codep)
250 result = (codep[0] & 0x80) ? (~(int_fast64_t) 0) : 0;
251 for (i = 0; i < 8; ++i)
252 result = result * 256 + (codep[i] & 0xff);
259 struct state * const sp = lclptr;
262 tzname[0] = wildabbr;
263 tzname[1] = wildabbr;
267 for (i = 0; i < sp->typecnt; ++i) {
268 const struct ttinfo * const ttisp = &sp->ttis[i];
270 tzname[ttisp->tt_isdst] =
271 &sp->chars[ttisp->tt_abbrind];
274 if (i == 0 || !ttisp->tt_isdst)
275 timezone = -(ttisp->tt_gmtoff);
278 ** And to get the latest zone names into tzname. . .
280 for (i = 0; i < sp->timecnt; ++i) {
281 const struct ttinfo * const ttisp =
285 tzname[ttisp->tt_isdst] =
286 &sp->chars[ttisp->tt_abbrind];
289 ** Finally, scrub the abbreviations.
290 ** First, replace bogus characters.
292 for (i = 0; i < sp->charcnt; ++i)
293 if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL)
294 sp->chars[i] = TZ_ABBR_ERR_CHAR;
296 ** Second, truncate long abbreviations.
298 for (i = 0; i < sp->typecnt; ++i) {
299 const struct ttinfo * const ttisp = &sp->ttis[i];
300 char * cp = &sp->chars[ttisp->tt_abbrind];
302 if (strlen(cp) > TZ_ABBR_MAX_LEN &&
303 strcmp(cp, GRANDPARENTED) != 0)
304 *(cp + TZ_ABBR_MAX_LEN) = '\0';
309 differ_by_repeat(const time_t t1, const time_t t0)
311 if (TYPE_INTEGRAL(time_t) &&
312 TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS)
314 return t1 - t0 == SECSPERREPEAT;
318 tzload(const char *name, struct state * const sp, const int doextend)
326 struct tzhead tzhead;
327 char buf[2 * sizeof(struct tzhead) +
332 /* XXX The following is from OpenBSD, and I'm not sure it is correct */
333 if (name != NULL && issetugid() != 0)
334 if ((name[0] == ':' && name[1] == '/') ||
335 name[0] == '/' || strchr(name, '.'))
337 if (name == NULL && (name = TZDEFAULT) == NULL)
343 ** Section 4.9.1 of the C standard says that
344 ** "FILENAME_MAX expands to an integral constant expression
345 ** that is the size needed for an array of char large enough
346 ** to hold the longest file name string that the implementation
347 ** guarantees can be opened."
349 char fullname[FILENAME_MAX + 1];
353 doaccess = name[0] == '/';
355 if ((p = TZDIR) == NULL)
357 if ((strlen(p) + 1 + strlen(name) + 1) >= sizeof fullname)
360 strcat(fullname, "/");
361 strcat(fullname, name);
363 ** Set doaccess if '.' (as in "../") shows up in name.
365 if (strchr(name, '.') != NULL)
369 if (doaccess && access(name, R_OK) != 0)
371 if ((fid = _open(name, O_RDONLY)) == -1)
373 if ((_fstat(fid, &stab) < 0) || !S_ISREG(stab.st_mode)) {
378 nread = read(fid, u.buf, sizeof u.buf);
379 if (close(fid) < 0 || nread <= 0)
381 for (stored = 4; stored <= 8; stored *= 2) {
385 ttisstdcnt = (int) detzcode(u.tzhead.tzh_ttisstdcnt);
386 ttisgmtcnt = (int) detzcode(u.tzhead.tzh_ttisgmtcnt);
387 sp->leapcnt = (int) detzcode(u.tzhead.tzh_leapcnt);
388 sp->timecnt = (int) detzcode(u.tzhead.tzh_timecnt);
389 sp->typecnt = (int) detzcode(u.tzhead.tzh_typecnt);
390 sp->charcnt = (int) detzcode(u.tzhead.tzh_charcnt);
391 p = u.tzhead.tzh_charcnt + sizeof u.tzhead.tzh_charcnt;
392 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS ||
393 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES ||
394 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES ||
395 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS ||
396 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) ||
397 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0))
399 if (nread - (p - u.buf) <
400 sp->timecnt * stored + /* ats */
401 sp->timecnt + /* types */
402 sp->typecnt * 6 + /* ttinfos */
403 sp->charcnt + /* chars */
404 sp->leapcnt * (stored + 4) + /* lsinfos */
405 ttisstdcnt + /* ttisstds */
406 ttisgmtcnt) /* ttisgmts */
408 for (i = 0; i < sp->timecnt; ++i) {
409 sp->ats[i] = (stored == 4) ?
410 detzcode(p) : detzcode64(p);
413 for (i = 0; i < sp->timecnt; ++i) {
414 sp->types[i] = (unsigned char) *p++;
415 if (sp->types[i] >= sp->typecnt)
418 for (i = 0; i < sp->typecnt; ++i) {
419 struct ttinfo * ttisp;
421 ttisp = &sp->ttis[i];
422 ttisp->tt_gmtoff = detzcode(p);
424 ttisp->tt_isdst = (unsigned char) *p++;
425 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1)
427 ttisp->tt_abbrind = (unsigned char) *p++;
428 if (ttisp->tt_abbrind < 0 ||
429 ttisp->tt_abbrind > sp->charcnt)
432 for (i = 0; i < sp->charcnt; ++i)
434 sp->chars[i] = '\0'; /* ensure '\0' at end */
435 for (i = 0; i < sp->leapcnt; ++i) {
436 struct lsinfo * lsisp;
438 lsisp = &sp->lsis[i];
439 lsisp->ls_trans = (stored == 4) ?
440 detzcode(p) : detzcode64(p);
442 lsisp->ls_corr = detzcode(p);
445 for (i = 0; i < sp->typecnt; ++i) {
446 struct ttinfo * ttisp;
448 ttisp = &sp->ttis[i];
450 ttisp->tt_ttisstd = FALSE;
452 ttisp->tt_ttisstd = *p++;
453 if (ttisp->tt_ttisstd != TRUE &&
454 ttisp->tt_ttisstd != FALSE)
458 for (i = 0; i < sp->typecnt; ++i) {
459 struct ttinfo * ttisp;
461 ttisp = &sp->ttis[i];
463 ttisp->tt_ttisgmt = FALSE;
465 ttisp->tt_ttisgmt = *p++;
466 if (ttisp->tt_ttisgmt != TRUE &&
467 ttisp->tt_ttisgmt != FALSE)
472 ** Out-of-sort ats should mean we're running on a
473 ** signed time_t system but using a data file with
474 ** unsigned values (or vice versa).
476 for (i = 0; i < sp->timecnt - 2; ++i)
477 if (sp->ats[i] > sp->ats[i + 1]) {
479 if (TYPE_SIGNED(time_t)) {
481 ** Ignore the end (easy).
486 ** Ignore the beginning (harder).
490 for (j = 0; j + i < sp->timecnt; ++j) {
491 sp->ats[j] = sp->ats[j + i];
492 sp->types[j] = sp->types[j + i];
499 ** If this is an old file, we're done.
501 if (u.tzhead.tzh_version[0] == '\0')
504 for (i = 0; i < nread; ++i)
507 ** If this is a narrow integer time_t system, we're done.
509 if (stored >= (int) sizeof(time_t) && TYPE_INTEGRAL(time_t))
512 if (doextend && nread > 2 &&
513 u.buf[0] == '\n' && u.buf[nread - 1] == '\n' &&
514 sp->typecnt + 2 <= TZ_MAX_TYPES) {
518 u.buf[nread - 1] = '\0';
519 result = tzparse(&u.buf[1], &ts, FALSE);
520 if (result == 0 && ts.typecnt == 2 &&
521 sp->charcnt + ts.charcnt <= TZ_MAX_CHARS) {
522 for (i = 0; i < 2; ++i)
523 ts.ttis[i].tt_abbrind +=
525 for (i = 0; i < ts.charcnt; ++i)
526 sp->chars[sp->charcnt++] =
529 while (i < ts.timecnt &&
531 sp->ats[sp->timecnt - 1])
533 while (i < ts.timecnt &&
534 sp->timecnt < TZ_MAX_TIMES) {
535 sp->ats[sp->timecnt] =
537 sp->types[sp->timecnt] =
543 sp->ttis[sp->typecnt++] = ts.ttis[0];
544 sp->ttis[sp->typecnt++] = ts.ttis[1];
547 sp->goback = sp->goahead = FALSE;
548 if (sp->timecnt > 1) {
549 for (i = 1; i < sp->timecnt; ++i)
550 if (typesequiv(sp, sp->types[i], sp->types[0]) &&
551 differ_by_repeat(sp->ats[i], sp->ats[0])) {
555 for (i = sp->timecnt - 2; i >= 0; --i)
556 if (typesequiv(sp, sp->types[sp->timecnt - 1],
558 differ_by_repeat(sp->ats[sp->timecnt - 1],
568 typesequiv(const struct state * const sp, const int a, const int b)
573 a < 0 || a >= sp->typecnt ||
574 b < 0 || b >= sp->typecnt)
577 const struct ttinfo * ap = &sp->ttis[a];
578 const struct ttinfo * bp = &sp->ttis[b];
579 result = ap->tt_gmtoff == bp->tt_gmtoff &&
580 ap->tt_isdst == bp->tt_isdst &&
581 ap->tt_ttisstd == bp->tt_ttisstd &&
582 ap->tt_ttisgmt == bp->tt_ttisgmt &&
583 strcmp(&sp->chars[ap->tt_abbrind],
584 &sp->chars[bp->tt_abbrind]) == 0;
589 static const int mon_lengths[2][MONSPERYEAR] = {
590 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
591 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
594 static const int year_lengths[2] = {
595 DAYSPERNYEAR, DAYSPERLYEAR
599 ** Given a pointer into a time zone string, scan until a character that is not
600 ** a valid character in a zone name is found. Return a pointer to that
605 getzname(const char *strp)
609 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' &&
616 ** Given a pointer into an extended time zone string, scan until the ending
617 ** delimiter of the zone name is located. Return a pointer to the delimiter.
619 ** As with getzname above, the legal character set is actually quite
620 ** restricted, with other characters producing undefined results.
621 ** We don't do any checking here; checking is done later in common-case code.
625 getqzname(const char *strp, const int delim)
629 while ((c = *strp) != '\0' && c != delim)
635 ** Given a pointer into a time zone string, extract a number from that string.
636 ** Check that the number is within a specified range; if it is not, return
638 ** Otherwise, return a pointer to the first character not part of the number.
642 getnum(const char *strp, int * const nump, const int min, const int max)
647 if (strp == NULL || !is_digit(c = *strp))
651 num = num * 10 + (c - '0');
653 return NULL; /* illegal value */
655 } while (is_digit(c));
657 return NULL; /* illegal value */
663 ** Given a pointer into a time zone string, extract a number of seconds,
664 ** in hh[:mm[:ss]] form, from the string.
665 ** If any error occurs, return NULL.
666 ** Otherwise, return a pointer to the first character not part of the number
671 getsecs(const char *strp, long * const secsp)
676 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like
677 ** "M10.4.6/26", which does not conform to Posix,
678 ** but which specifies the equivalent of
679 ** ``02:00 on the first Sunday on or after 23 Oct''.
681 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1);
684 *secsp = num * (long) SECSPERHOUR;
687 strp = getnum(strp, &num, 0, MINSPERHOUR - 1);
690 *secsp += num * SECSPERMIN;
693 /* `SECSPERMIN' allows for leap seconds. */
694 strp = getnum(strp, &num, 0, SECSPERMIN);
704 ** Given a pointer into a time zone string, extract an offset, in
705 ** [+-]hh[:mm[:ss]] form, from the string.
706 ** If any error occurs, return NULL.
707 ** Otherwise, return a pointer to the first character not part of the time.
711 getoffset(const char *strp, long * const offsetp)
718 } else if (*strp == '+')
720 strp = getsecs(strp, offsetp);
722 return NULL; /* illegal time */
724 *offsetp = -*offsetp;
729 ** Given a pointer into a time zone string, extract a rule in the form
730 ** date[/time]. See POSIX section 8 for the format of "date" and "time".
731 ** If a valid rule is not found, return NULL.
732 ** Otherwise, return a pointer to the first character not part of the rule.
736 getrule(const char *strp, struct rule * const rulep)
742 rulep->r_type = JULIAN_DAY;
744 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR);
745 } else if (*strp == 'M') {
749 rulep->r_type = MONTH_NTH_DAY_OF_WEEK;
751 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR);
756 strp = getnum(strp, &rulep->r_week, 1, 5);
761 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1);
762 } else if (is_digit(*strp)) {
766 rulep->r_type = DAY_OF_YEAR;
767 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1);
768 } else return NULL; /* invalid format */
776 strp = getsecs(strp, &rulep->r_time);
777 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */
782 ** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the
783 ** year, a rule, and the offset from UTC at the time that rule takes effect,
784 ** calculate the Epoch-relative time that rule takes effect.
788 transtime(const time_t janfirst, const int year,
789 const struct rule * const rulep, const long offset)
794 int d, m1, yy0, yy1, yy2, dow;
797 leapyear = isleap(year);
798 switch (rulep->r_type) {
802 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap
804 ** In non-leap years, or if the day number is 59 or less, just
805 ** add SECSPERDAY times the day number-1 to the time of
806 ** January 1, midnight, to get the day.
808 value = janfirst + (rulep->r_day - 1) * SECSPERDAY;
809 if (leapyear && rulep->r_day >= 60)
816 ** Just add SECSPERDAY times the day number to the time of
817 ** January 1, midnight, to get the day.
819 value = janfirst + rulep->r_day * SECSPERDAY;
822 case MONTH_NTH_DAY_OF_WEEK:
824 ** Mm.n.d - nth "dth day" of month m.
827 for (i = 0; i < rulep->r_mon - 1; ++i)
828 value += mon_lengths[leapyear][i] * SECSPERDAY;
831 ** Use Zeller's Congruence to get day-of-week of first day of
834 m1 = (rulep->r_mon + 9) % 12 + 1;
835 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year;
838 dow = ((26 * m1 - 2) / 10 +
839 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7;
844 ** "dow" is the day-of-week of the first day of the month. Get
845 ** the day-of-month (zero-origin) of the first "dow" day of the
848 d = rulep->r_day - dow;
851 for (i = 1; i < rulep->r_week; ++i) {
852 if (d + DAYSPERWEEK >=
853 mon_lengths[leapyear][rulep->r_mon - 1])
859 ** "d" is the day-of-month (zero-origin) of the day we want.
861 value += d * SECSPERDAY;
866 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in
867 ** question. To get the Epoch-relative time of the specified local
868 ** time on that day, add the transition time and the current offset
871 return value + rulep->r_time + offset;
875 ** Given a POSIX section 8-style TZ string, fill in the rule tables as
880 tzparse(const char *name, struct state * const sp, const int lastditch)
882 const char * stdname;
883 const char * dstname;
889 unsigned char * typep;
896 stdlen = strlen(name); /* length of standard zone name */
898 if (stdlen >= sizeof sp->chars)
899 stdlen = (sizeof sp->chars) - 1;
905 name = getqzname(name, '>');
908 stdlen = name - stdname;
911 name = getzname(name);
912 stdlen = name - stdname;
916 name = getoffset(name, &stdoffset);
920 load_result = tzload(TZDEFRULES, sp, FALSE);
921 if (load_result != 0)
922 sp->leapcnt = 0; /* so, we're off a little */
926 name = getqzname(name, '>');
929 dstlen = name - dstname;
933 name = getzname(name);
934 dstlen = name - dstname; /* length of DST zone name */
936 if (*name != '\0' && *name != ',' && *name != ';') {
937 name = getoffset(name, &dstoffset);
940 } else dstoffset = stdoffset - SECSPERHOUR;
941 if (*name == '\0' && load_result != 0)
942 name = TZDEFRULESTRING;
943 if (*name == ',' || *name == ';') {
952 if ((name = getrule(name, &start)) == NULL)
956 if ((name = getrule(name, &end)) == NULL)
960 sp->typecnt = 2; /* standard time and DST */
962 ** Two transitions per year, from EPOCH_YEAR forward.
964 sp->ttis[0].tt_gmtoff = -dstoffset;
965 sp->ttis[0].tt_isdst = 1;
966 sp->ttis[0].tt_abbrind = stdlen + 1;
967 sp->ttis[1].tt_gmtoff = -stdoffset;
968 sp->ttis[1].tt_isdst = 0;
969 sp->ttis[1].tt_abbrind = 0;
974 for (year = EPOCH_YEAR;
975 sp->timecnt + 2 <= TZ_MAX_TIMES;
979 starttime = transtime(janfirst, year, &start,
981 endtime = transtime(janfirst, year, &end,
983 if (starttime > endtime) {
985 *typep++ = 1; /* DST ends */
987 *typep++ = 0; /* DST begins */
990 *typep++ = 0; /* DST begins */
992 *typep++ = 1; /* DST ends */
996 newfirst += year_lengths[isleap(year)] *
998 if (newfirst <= janfirst)
1000 janfirst = newfirst;
1003 long theirstdoffset;
1004 long theirdstoffset;
1013 ** Initial values of theirstdoffset and theirdstoffset.
1016 for (i = 0; i < sp->timecnt; ++i) {
1018 if (!sp->ttis[j].tt_isdst) {
1020 -sp->ttis[j].tt_gmtoff;
1025 for (i = 0; i < sp->timecnt; ++i) {
1027 if (sp->ttis[j].tt_isdst) {
1029 -sp->ttis[j].tt_gmtoff;
1034 ** Initially we're assumed to be in standard time.
1037 theiroffset = theirstdoffset;
1039 ** Now juggle transition times and types
1040 ** tracking offsets as you do.
1042 for (i = 0; i < sp->timecnt; ++i) {
1044 sp->types[i] = sp->ttis[j].tt_isdst;
1045 if (sp->ttis[j].tt_ttisgmt) {
1046 /* No adjustment to transition time */
1049 ** If summer time is in effect, and the
1050 ** transition time was not specified as
1051 ** standard time, add the summer time
1052 ** offset to the transition time;
1053 ** otherwise, add the standard time
1054 ** offset to the transition time.
1057 ** Transitions from DST to DDST
1058 ** will effectively disappear since
1059 ** POSIX provides for only one DST
1062 if (isdst && !sp->ttis[j].tt_ttisstd) {
1063 sp->ats[i] += dstoffset -
1066 sp->ats[i] += stdoffset -
1070 theiroffset = -sp->ttis[j].tt_gmtoff;
1071 if (sp->ttis[j].tt_isdst)
1072 theirdstoffset = theiroffset;
1073 else theirstdoffset = theiroffset;
1076 ** Finally, fill in ttis.
1077 ** ttisstd and ttisgmt need not be handled.
1079 sp->ttis[0].tt_gmtoff = -stdoffset;
1080 sp->ttis[0].tt_isdst = FALSE;
1081 sp->ttis[0].tt_abbrind = 0;
1082 sp->ttis[1].tt_gmtoff = -dstoffset;
1083 sp->ttis[1].tt_isdst = TRUE;
1084 sp->ttis[1].tt_abbrind = stdlen + 1;
1089 sp->typecnt = 1; /* only standard time */
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((char *) 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];
1867 if (tmp->tm_isdst > 1)
1869 t = time2(tmp, funcp, offset, &okay);
1872 ** PCTS code courtesy Grant Sullivan.
1876 if (tmp->tm_isdst < 0)
1877 tmp->tm_isdst = 0; /* reset to std and try again */
1880 ** We're supposed to assume that somebody took a time of one type
1881 ** and did some math on it that yielded a "struct tm" that's bad.
1882 ** We try to divine the type they started from and adjust to the
1885 sp = (const struct state *) ((funcp == localsub) ? lclptr : gmtptr);
1887 for (i = 0; i < sp->typecnt; ++i)
1890 for (i = sp->timecnt - 1; i >= 0; --i)
1891 if (!seen[sp->types[i]]) {
1892 seen[sp->types[i]] = TRUE;
1893 types[nseen++] = sp->types[i];
1895 for (sameind = 0; sameind < nseen; ++sameind) {
1896 samei = types[sameind];
1897 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst)
1899 for (otherind = 0; otherind < nseen; ++otherind) {
1900 otheri = types[otherind];
1901 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst)
1903 tmp->tm_sec += sp->ttis[otheri].tt_gmtoff -
1904 sp->ttis[samei].tt_gmtoff;
1905 tmp->tm_isdst = !tmp->tm_isdst;
1906 t = time2(tmp, funcp, offset, &okay);
1909 tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff -
1910 sp->ttis[samei].tt_gmtoff;
1911 tmp->tm_isdst = !tmp->tm_isdst;
1918 mktime(struct tm * const tmp)
1920 time_t mktime_return_value;
1921 _RWLOCK_RDLOCK(&lcl_rwlock);
1923 mktime_return_value = time1(tmp, localsub, 0L);
1924 _RWLOCK_UNLOCK(&lcl_rwlock);
1925 return(mktime_return_value);
1929 timelocal(struct tm * const tmp)
1931 tmp->tm_isdst = -1; /* in case it wasn't initialized */
1936 timegm(struct tm * const tmp)
1939 return time1(tmp, gmtsub, 0L);
1943 timeoff(struct tm * const tmp, const long offset)
1946 return time1(tmp, gmtsub, offset);
1952 ** The following is supplied for compatibility with
1953 ** previous versions of the CMUCS runtime library.
1957 gtime(struct tm * const tmp)
1959 const time_t t = mktime(tmp);
1966 #endif /* defined CMUCS */
1969 ** XXX--is the below the right way to conditionalize??
1973 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599
1974 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which
1975 ** is not the case if we are accounting for leap seconds.
1976 ** So, we provide the following conversion routines for use
1977 ** when exchanging timestamps with POSIX conforming systems.
1981 leapcorr(time_t *timep)
1991 if (*timep >= lp->ls_trans)
1998 time2posix(time_t t)
2001 return t - leapcorr(&t);
2005 posix2time(time_t t)
2012 ** For a positive leap second hit, the result
2013 ** is not unique. For a negative leap second
2014 ** hit, the corresponding time doesn't exist,
2015 ** so we return an adjacent second.
2017 x = t + leapcorr(&t);
2018 y = x - leapcorr(&x);
2022 y = x - leapcorr(&x);
2029 y = x - leapcorr(&x);