2 ** This file is in the public domain, so clarified as of
3 ** 1996-06-05 by Arthur David Olson.
9 static char elsieid[] __unused = "@(#)localtime.c 8.14";
10 #endif /* !defined NOID */
11 #endif /* !defined lint */
12 __FBSDID("$FreeBSD$");
15 ** Leap second handling from Bradley White.
16 ** POSIX-style TZ environment variable handling from Guy Harris.
21 #include "namespace.h"
22 #include <sys/types.h>
28 #include "un-namespace.h"
31 #include "float.h" /* for FLT_MAX and DBL_MAX */
33 #ifndef TZ_ABBR_MAX_LEN
34 #define TZ_ABBR_MAX_LEN 16
35 #endif /* !defined TZ_ABBR_MAX_LEN */
37 #ifndef TZ_ABBR_CHAR_SET
38 #define TZ_ABBR_CHAR_SET \
39 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._"
40 #endif /* !defined TZ_ABBR_CHAR_SET */
42 #ifndef TZ_ABBR_ERR_CHAR
43 #define TZ_ABBR_ERR_CHAR '_'
44 #endif /* !defined TZ_ABBR_ERR_CHAR */
46 #include "libc_private.h"
48 #define _MUTEX_LOCK(x) if (__isthreaded) _pthread_mutex_lock(x)
49 #define _MUTEX_UNLOCK(x) if (__isthreaded) _pthread_mutex_unlock(x)
51 #define _RWLOCK_RDLOCK(x) \
53 if (__isthreaded) _pthread_rwlock_rdlock(x); \
56 #define _RWLOCK_WRLOCK(x) \
58 if (__isthreaded) _pthread_rwlock_wrlock(x); \
61 #define _RWLOCK_UNLOCK(x) \
63 if (__isthreaded) _pthread_rwlock_unlock(x); \
67 ** SunOS 4.1.1 headers lack O_BINARY.
71 #define OPEN_MODE (O_RDONLY | O_BINARY)
72 #endif /* defined O_BINARY */
74 #define OPEN_MODE O_RDONLY
75 #endif /* !defined O_BINARY */
79 ** Someone might make incorrect use of a time zone abbreviation:
80 ** 1. They might reference tzname[0] before calling tzset (explicitly
82 ** 2. They might reference tzname[1] before calling tzset (explicitly
84 ** 3. They might reference tzname[1] after setting to a time zone
85 ** in which Daylight Saving Time is never observed.
86 ** 4. They might reference tzname[0] after setting to a time zone
87 ** in which Standard Time is never observed.
88 ** 5. They might reference tm.TM_ZONE after calling offtime.
89 ** What's best to do in the above cases is open to debate;
90 ** for now, we just set things up so that in any of the five cases
91 ** WILDABBR is used. Another possibility: initialize tzname[0] to the
92 ** string "tzname[0] used before set", and similarly for the other cases.
93 ** And another: initialize tzname[0] to "ERA", with an explanation in the
94 ** manual page of what this "time zone abbreviation" means (doing this so
95 ** that tzname[0] has the "normal" length of three characters).
98 #endif /* !defined WILDABBR */
100 static char wildabbr[] = WILDABBR;
103 * In June 2004 it was decided UTC was a more appropriate default time
107 static const char gmt[] = "UTC";
110 ** The DST rules to use if TZ has no rules and we can't load TZDEFRULES.
111 ** We default to US rules as of 1999-08-17.
112 ** POSIX 1003.1 section 8.1.1 says that the default DST rules are
113 ** implementation dependent; for historical reasons, US rules are a
116 #ifndef TZDEFRULESTRING
117 #define TZDEFRULESTRING ",M4.1.0,M10.5.0"
118 #endif /* !defined TZDEFDST */
120 struct ttinfo { /* time type information */
121 long tt_gmtoff; /* UTC offset in seconds */
122 int tt_isdst; /* used to set tm_isdst */
123 int tt_abbrind; /* abbreviation list index */
124 int tt_ttisstd; /* TRUE if transition is std time */
125 int tt_ttisgmt; /* TRUE if transition is UTC */
128 struct lsinfo { /* leap second information */
129 time_t ls_trans; /* transition time */
130 long ls_corr; /* correction to apply */
133 #define BIGGEST(a, b) (((a) > (b)) ? (a) : (b))
136 #define MY_TZNAME_MAX TZNAME_MAX
137 #endif /* defined TZNAME_MAX */
139 #define MY_TZNAME_MAX 255
140 #endif /* !defined TZNAME_MAX */
149 time_t ats[TZ_MAX_TIMES];
150 unsigned char types[TZ_MAX_TIMES];
151 struct ttinfo ttis[TZ_MAX_TYPES];
152 char chars[BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, sizeof gmt),
153 (2 * (MY_TZNAME_MAX + 1)))];
154 struct lsinfo lsis[TZ_MAX_LEAPS];
158 int r_type; /* type of rule--see below */
159 int r_day; /* day number of rule */
160 int r_week; /* week number of rule */
161 int r_mon; /* month number of rule */
162 long r_time; /* transition time of rule */
165 #define JULIAN_DAY 0 /* Jn - Julian day */
166 #define DAY_OF_YEAR 1 /* n - day of year */
167 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */
170 ** Prototypes for static functions.
173 static long detzcode(const char * codep);
174 static time_t detzcode64(const char * codep);
175 static int differ_by_repeat(time_t t1, time_t t0);
176 static const char * getzname(const char * strp);
177 static const char * getqzname(const char * strp, const int delim);
178 static const char * getnum(const char * strp, int * nump, int min,
180 static const char * getsecs(const char * strp, long * secsp);
181 static const char * getoffset(const char * strp, long * offsetp);
182 static const char * getrule(const char * strp, struct rule * rulep);
183 static void gmtload(struct state * sp);
184 static struct tm * gmtsub(const time_t * timep, long offset,
186 static struct tm * localsub(const time_t * timep, long offset,
188 static int increment_overflow(int * number, int delta);
189 static int leaps_thru_end_of(int y);
190 static int long_increment_overflow(long * number, int delta);
191 static int long_normalize_overflow(long * tensptr,
192 int * unitsptr, int base);
193 static int normalize_overflow(int * tensptr, int * unitsptr,
195 static void settzname(void);
196 static time_t time1(struct tm * tmp,
197 struct tm * (*funcp)(const time_t *,
200 static time_t time2(struct tm *tmp,
201 struct tm * (*funcp)(const time_t *,
203 long offset, int * okayp);
204 static time_t time2sub(struct tm *tmp,
205 struct tm * (*funcp)(const time_t *,
207 long offset, int * okayp, int do_norm_secs);
208 static struct tm * timesub(const time_t * timep, long offset,
209 const struct state * sp, struct tm * tmp);
210 static int tmcomp(const struct tm * atmp,
211 const struct tm * btmp);
212 static time_t transtime(time_t janfirst, int year,
213 const struct rule * rulep, long offset);
214 static int typesequiv(const struct state * sp, int a, int b);
215 static int tzload(const char * name, struct state * sp,
217 static int tzparse(const char * name, struct state * sp,
221 static struct state * lclptr;
222 static struct state * gmtptr;
223 #endif /* defined ALL_STATE */
226 static struct state lclmem;
227 static struct state gmtmem;
228 #define lclptr (&lclmem)
229 #define gmtptr (&gmtmem)
230 #endif /* State Farm */
232 #ifndef TZ_STRLEN_MAX
233 #define TZ_STRLEN_MAX 255
234 #endif /* !defined TZ_STRLEN_MAX */
236 static char lcl_TZname[TZ_STRLEN_MAX + 1];
237 static int lcl_is_set;
238 static pthread_once_t gmt_once = PTHREAD_ONCE_INIT;
239 static pthread_rwlock_t lcl_rwlock = PTHREAD_RWLOCK_INITIALIZER;
240 static pthread_once_t gmtime_once = PTHREAD_ONCE_INIT;
241 static pthread_key_t gmtime_key;
242 static int gmtime_key_error;
243 static pthread_once_t localtime_once = PTHREAD_ONCE_INIT;
244 static pthread_key_t localtime_key;
245 static int localtime_key_error;
253 ** Section 4.12.3 of X3.159-1989 requires that
254 ** Except for the strftime function, these functions [asctime,
255 ** ctime, gmtime, localtime] return values in one of two static
256 ** objects: a broken-down time structure and an array of char.
257 ** Thanks to Paul Eggert for noting this.
265 #endif /* defined USG_COMPAT */
269 #endif /* defined ALTZONE */
273 const char * const codep;
278 result = (codep[0] & 0x80) ? ~0L : 0;
279 for (i = 0; i < 4; ++i)
280 result = (result << 8) | (codep[i] & 0xff);
286 const char * const codep;
288 register time_t result;
291 result = (codep[0] & 0x80) ? (~(int_fast64_t) 0) : 0;
292 for (i = 0; i < 8; ++i)
293 result = result * 256 + (codep[i] & 0xff);
300 struct state * sp = lclptr;
303 tzname[0] = wildabbr;
304 tzname[1] = wildabbr;
308 #endif /* defined USG_COMPAT */
311 #endif /* defined ALTZONE */
314 tzname[0] = tzname[1] = gmt;
317 #endif /* defined ALL_STATE */
319 ** And to get the latest zone names into tzname. . .
321 for (i = 0; i < sp->typecnt; ++i) {
322 const struct ttinfo * const ttisp = &sp->ttis[sp->types[i]];
324 tzname[ttisp->tt_isdst] =
325 &sp->chars[ttisp->tt_abbrind];
329 if (!ttisp->tt_isdst)
330 timezone = -(ttisp->tt_gmtoff);
331 #endif /* defined USG_COMPAT */
334 altzone = -(ttisp->tt_gmtoff);
335 #endif /* defined ALTZONE */
338 ** Finally, scrub the abbreviations.
339 ** First, replace bogus characters.
341 for (i = 0; i < sp->charcnt; ++i)
342 if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL)
343 sp->chars[i] = TZ_ABBR_ERR_CHAR;
345 ** Second, truncate long abbreviations.
347 for (i = 0; i < sp->typecnt; ++i) {
348 register const struct ttinfo * const ttisp = &sp->ttis[i];
349 register char * cp = &sp->chars[ttisp->tt_abbrind];
351 if (strlen(cp) > TZ_ABBR_MAX_LEN &&
352 strcmp(cp, GRANDPARENTED) != 0)
353 *(cp + TZ_ABBR_MAX_LEN) = '\0';
358 differ_by_repeat(t1, t0)
362 int_fast64_t _t0 = t0;
363 int_fast64_t _t1 = t1;
365 if (TYPE_INTEGRAL(time_t) &&
366 TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS)
368 //turn ((int_fast64_t)(t1 - t0) == SECSPERREPEAT);
369 return _t1 - _t0 == SECSPERREPEAT;
373 tzload(name, sp, doextend)
375 struct state * const sp;
376 register const int doextend;
385 struct tzhead tzhead;
386 char buf[2 * sizeof(struct tzhead) +
393 sp->goback = sp->goahead = FALSE;
395 /* XXX The following is from OpenBSD, and I'm not sure it is correct */
396 if (name != NULL && issetugid() != 0)
397 if ((name[0] == ':' && name[1] == '/') ||
398 name[0] == '/' || strchr(name, '.'))
400 if (name == NULL && (name = TZDEFAULT) == NULL)
406 ** Section 4.9.1 of the C standard says that
407 ** "FILENAME_MAX expands to an integral constant expression
408 ** that is the size needed for an array of char large enough
409 ** to hold the longest file name string that the implementation
410 ** guarantees can be opened."
414 fullname = malloc(FILENAME_MAX + 1);
415 if (fullname == NULL)
420 doaccess = name[0] == '/';
422 if ((p = TZDIR) == NULL) {
426 if (strlen(p) + 1 + strlen(name) >= FILENAME_MAX) {
430 (void) strcpy(fullname, p);
431 (void) strcat(fullname, "/");
432 (void) strcat(fullname, name);
434 ** Set doaccess if '.' (as in "../") shows up in name.
436 if (strchr(name, '.') != NULL)
440 if (doaccess && access(name, R_OK) != 0) {
444 if ((fid = _open(name, OPEN_MODE)) == -1) {
448 if ((_fstat(fid, &stab) < 0) || !S_ISREG(stab.st_mode)) {
455 u = malloc(sizeof(*u));
458 nread = _read(fid, u->buf, sizeof u->buf);
459 if (_close(fid) < 0 || nread <= 0)
461 for (stored = 4; stored <= 8; stored *= 2) {
465 ttisstdcnt = (int) detzcode(u->tzhead.tzh_ttisstdcnt);
466 ttisgmtcnt = (int) detzcode(u->tzhead.tzh_ttisgmtcnt);
467 sp->leapcnt = (int) detzcode(u->tzhead.tzh_leapcnt);
468 sp->timecnt = (int) detzcode(u->tzhead.tzh_timecnt);
469 sp->typecnt = (int) detzcode(u->tzhead.tzh_typecnt);
470 sp->charcnt = (int) detzcode(u->tzhead.tzh_charcnt);
471 p = u->tzhead.tzh_charcnt + sizeof u->tzhead.tzh_charcnt;
472 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS ||
473 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES ||
474 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES ||
475 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS ||
476 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0) ||
477 (ttisgmtcnt != sp->typecnt && ttisgmtcnt != 0))
479 if (nread - (p - u->buf) <
480 sp->timecnt * stored + /* ats */
481 sp->timecnt + /* types */
482 sp->typecnt * 6 + /* ttinfos */
483 sp->charcnt + /* chars */
484 sp->leapcnt * (stored + 4) + /* lsinfos */
485 ttisstdcnt + /* ttisstds */
486 ttisgmtcnt) /* ttisgmts */
488 for (i = 0; i < sp->timecnt; ++i) {
489 sp->ats[i] = (stored == 4) ?
490 detzcode(p) : detzcode64(p);
493 for (i = 0; i < sp->timecnt; ++i) {
494 sp->types[i] = (unsigned char) *p++;
495 if (sp->types[i] >= sp->typecnt)
498 for (i = 0; i < sp->typecnt; ++i) {
499 struct ttinfo * ttisp;
501 ttisp = &sp->ttis[i];
502 ttisp->tt_gmtoff = detzcode(p);
504 ttisp->tt_isdst = (unsigned char) *p++;
505 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1)
507 ttisp->tt_abbrind = (unsigned char) *p++;
508 if (ttisp->tt_abbrind < 0 ||
509 ttisp->tt_abbrind > sp->charcnt)
512 for (i = 0; i < sp->charcnt; ++i)
514 sp->chars[i] = '\0'; /* ensure '\0' at end */
515 for (i = 0; i < sp->leapcnt; ++i) {
516 struct lsinfo * lsisp;
518 lsisp = &sp->lsis[i];
519 lsisp->ls_trans = (stored == 4) ?
520 detzcode(p) : detzcode64(p);
522 lsisp->ls_corr = detzcode(p);
525 for (i = 0; i < sp->typecnt; ++i) {
526 struct ttinfo * ttisp;
528 ttisp = &sp->ttis[i];
530 ttisp->tt_ttisstd = FALSE;
532 ttisp->tt_ttisstd = *p++;
533 if (ttisp->tt_ttisstd != TRUE &&
534 ttisp->tt_ttisstd != FALSE)
538 for (i = 0; i < sp->typecnt; ++i) {
539 struct ttinfo * ttisp;
541 ttisp = &sp->ttis[i];
543 ttisp->tt_ttisgmt = FALSE;
545 ttisp->tt_ttisgmt = *p++;
546 if (ttisp->tt_ttisgmt != TRUE &&
547 ttisp->tt_ttisgmt != FALSE)
552 ** Out-of-sort ats should mean we're running on a
553 ** signed time_t system but using a data file with
554 ** unsigned values (or vice versa).
556 for (i = 0; i < sp->timecnt - 2; ++i)
557 if (sp->ats[i] > sp->ats[i + 1]) {
559 if (TYPE_SIGNED(time_t)) {
561 ** Ignore the end (easy).
566 ** Ignore the beginning (harder).
570 for (j = 0; j + i < sp->timecnt; ++j) {
571 sp->ats[j] = sp->ats[j + i];
572 sp->types[j] = sp->types[j + i];
579 ** If this is an old file, we're done.
581 if (u->tzhead.tzh_version[0] == '\0')
584 for (i = 0; i < nread; ++i)
587 ** If this is a narrow integer time_t system, we're done.
589 if (stored >= (int) sizeof(time_t) && TYPE_INTEGRAL(time_t))
592 if (doextend && nread > 2 &&
593 u->buf[0] == '\n' && u->buf[nread - 1] == '\n' &&
594 sp->typecnt + 2 <= TZ_MAX_TYPES) {
598 ts = malloc(sizeof(*ts));
601 u->buf[nread - 1] = '\0';
602 result = tzparse(&u->buf[1], ts, FALSE);
603 if (result == 0 && ts->typecnt == 2 &&
604 sp->charcnt + ts->charcnt <= TZ_MAX_CHARS) {
605 for (i = 0; i < 2; ++i)
606 ts->ttis[i].tt_abbrind +=
608 for (i = 0; i < ts->charcnt; ++i)
609 sp->chars[sp->charcnt++] =
612 while (i < ts->timecnt &&
614 sp->ats[sp->timecnt - 1])
616 while (i < ts->timecnt &&
617 sp->timecnt < TZ_MAX_TIMES) {
618 sp->ats[sp->timecnt] =
620 sp->types[sp->timecnt] =
626 sp->ttis[sp->typecnt++] = ts->ttis[0];
627 sp->ttis[sp->typecnt++] = ts->ttis[1];
631 if (sp->timecnt > 1) {
632 for (i = 1; i < sp->timecnt; ++i)
633 if (typesequiv(sp, sp->types[i], sp->types[0]) &&
634 differ_by_repeat(sp->ats[i], sp->ats[0])) {
638 for (i = sp->timecnt - 2; i >= 0; --i)
639 if (typesequiv(sp, sp->types[sp->timecnt - 1],
641 differ_by_repeat(sp->ats[sp->timecnt - 1],
655 const struct state * const sp;
662 a < 0 || a >= sp->typecnt ||
663 b < 0 || b >= sp->typecnt)
666 register const struct ttinfo * ap = &sp->ttis[a];
667 register const struct ttinfo * bp = &sp->ttis[b];
668 result = ap->tt_gmtoff == bp->tt_gmtoff &&
669 ap->tt_isdst == bp->tt_isdst &&
670 ap->tt_ttisstd == bp->tt_ttisstd &&
671 ap->tt_ttisgmt == bp->tt_ttisgmt &&
672 strcmp(&sp->chars[ap->tt_abbrind],
673 &sp->chars[bp->tt_abbrind]) == 0;
678 static const int mon_lengths[2][MONSPERYEAR] = {
679 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
680 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
683 static const int year_lengths[2] = {
684 DAYSPERNYEAR, DAYSPERLYEAR
688 ** Given a pointer into a time zone string, scan until a character that is not
689 ** a valid character in a zone name is found. Return a pointer to that
699 while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' &&
706 ** Given a pointer into an extended time zone string, scan until the ending
707 ** delimiter of the zone name is located. Return a pointer to the delimiter.
709 ** As with getzname above, the legal character set is actually quite
710 ** restricted, with other characters producing undefined results.
711 ** We don't do any checking here; checking is done later in common-case code.
715 getqzname(register const char *strp, const int delim)
719 while ((c = *strp) != '\0' && c != delim)
725 ** Given a pointer into a time zone string, extract a number from that string.
726 ** Check that the number is within a specified range; if it is not, return
728 ** Otherwise, return a pointer to the first character not part of the number.
732 getnum(strp, nump, min, max)
741 if (strp == NULL || !is_digit(c = *strp))
745 num = num * 10 + (c - '0');
747 return NULL; /* illegal value */
749 } while (is_digit(c));
751 return NULL; /* illegal value */
757 ** Given a pointer into a time zone string, extract a number of seconds,
758 ** in hh[:mm[:ss]] form, from the string.
759 ** If any error occurs, return NULL.
760 ** Otherwise, return a pointer to the first character not part of the number
772 ** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like
773 ** "M10.4.6/26", which does not conform to Posix,
774 ** but which specifies the equivalent of
775 ** ``02:00 on the first Sunday on or after 23 Oct''.
777 strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1);
780 *secsp = num * (long) SECSPERHOUR;
783 strp = getnum(strp, &num, 0, MINSPERHOUR - 1);
786 *secsp += num * SECSPERMIN;
789 /* `SECSPERMIN' allows for leap seconds. */
790 strp = getnum(strp, &num, 0, SECSPERMIN);
800 ** Given a pointer into a time zone string, extract an offset, in
801 ** [+-]hh[:mm[:ss]] form, from the string.
802 ** If any error occurs, return NULL.
803 ** Otherwise, return a pointer to the first character not part of the time.
807 getoffset(strp, offsetp)
809 long * const offsetp;
816 } else if (*strp == '+')
818 strp = getsecs(strp, offsetp);
820 return NULL; /* illegal time */
822 *offsetp = -*offsetp;
827 ** Given a pointer into a time zone string, extract a rule in the form
828 ** date[/time]. See POSIX section 8 for the format of "date" and "time".
829 ** If a valid rule is not found, return NULL.
830 ** Otherwise, return a pointer to the first character not part of the rule.
836 struct rule * const rulep;
842 rulep->r_type = JULIAN_DAY;
844 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR);
845 } else if (*strp == 'M') {
849 rulep->r_type = MONTH_NTH_DAY_OF_WEEK;
851 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR);
856 strp = getnum(strp, &rulep->r_week, 1, 5);
861 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1);
862 } else if (is_digit(*strp)) {
866 rulep->r_type = DAY_OF_YEAR;
867 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1);
868 } else return NULL; /* invalid format */
876 strp = getsecs(strp, &rulep->r_time);
877 } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */
882 ** Given the Epoch-relative time of January 1, 00:00:00 UTC, in a year, the
883 ** year, a rule, and the offset from UTC at the time that rule takes effect,
884 ** calculate the Epoch-relative time that rule takes effect.
888 transtime(janfirst, year, rulep, offset)
889 const time_t janfirst;
891 const struct rule * const rulep;
897 int d, m1, yy0, yy1, yy2, dow;
900 leapyear = isleap(year);
901 switch (rulep->r_type) {
905 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap
907 ** In non-leap years, or if the day number is 59 or less, just
908 ** add SECSPERDAY times the day number-1 to the time of
909 ** January 1, midnight, to get the day.
911 value = janfirst + (rulep->r_day - 1) * SECSPERDAY;
912 if (leapyear && rulep->r_day >= 60)
919 ** Just add SECSPERDAY times the day number to the time of
920 ** January 1, midnight, to get the day.
922 value = janfirst + rulep->r_day * SECSPERDAY;
925 case MONTH_NTH_DAY_OF_WEEK:
927 ** Mm.n.d - nth "dth day" of month m.
930 for (i = 0; i < rulep->r_mon - 1; ++i)
931 value += mon_lengths[leapyear][i] * SECSPERDAY;
934 ** Use Zeller's Congruence to get day-of-week of first day of
937 m1 = (rulep->r_mon + 9) % 12 + 1;
938 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year;
941 dow = ((26 * m1 - 2) / 10 +
942 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7;
947 ** "dow" is the day-of-week of the first day of the month. Get
948 ** the day-of-month (zero-origin) of the first "dow" day of the
951 d = rulep->r_day - dow;
954 for (i = 1; i < rulep->r_week; ++i) {
955 if (d + DAYSPERWEEK >=
956 mon_lengths[leapyear][rulep->r_mon - 1])
962 ** "d" is the day-of-month (zero-origin) of the day we want.
964 value += d * SECSPERDAY;
969 ** "value" is the Epoch-relative time of 00:00:00 UTC on the day in
970 ** question. To get the Epoch-relative time of the specified local
971 ** time on that day, add the transition time and the current offset
974 return value + rulep->r_time + offset;
978 ** Given a POSIX section 8-style TZ string, fill in the rule tables as
983 tzparse(name, sp, lastditch)
985 struct state * const sp;
988 const char * stdname;
989 const char * dstname;
995 unsigned char * typep;
1002 stdlen = strlen(name); /* length of standard zone name */
1004 if (stdlen >= sizeof sp->chars)
1005 stdlen = (sizeof sp->chars) - 1;
1011 name = getqzname(name, '>');
1014 stdlen = name - stdname;
1017 name = getzname(name);
1018 stdlen = name - stdname;
1021 return -1; /* was "stdoffset = 0;" */
1023 name = getoffset(name, &stdoffset);
1028 load_result = tzload(TZDEFRULES, sp, FALSE);
1029 if (load_result != 0)
1030 sp->leapcnt = 0; /* so, we're off a little */
1031 if (*name != '\0') {
1034 name = getqzname(name, '>');
1037 dstlen = name - dstname;
1041 name = getzname(name);
1042 dstlen = name - dstname; /* length of DST zone name */
1044 if (*name != '\0' && *name != ',' && *name != ';') {
1045 name = getoffset(name, &dstoffset);
1048 } else dstoffset = stdoffset - SECSPERHOUR;
1049 if (*name == '\0' && load_result != 0)
1050 name = TZDEFRULESTRING;
1051 if (*name == ',' || *name == ';') {
1060 if ((name = getrule(name, &start)) == NULL)
1064 if ((name = getrule(name, &end)) == NULL)
1068 sp->typecnt = 2; /* standard time and DST */
1070 ** Two transitions per year, from EPOCH_YEAR forward.
1072 sp->ttis[0].tt_gmtoff = -dstoffset;
1073 sp->ttis[0].tt_isdst = 1;
1074 sp->ttis[0].tt_abbrind = stdlen + 1;
1075 sp->ttis[1].tt_gmtoff = -stdoffset;
1076 sp->ttis[1].tt_isdst = 0;
1077 sp->ttis[1].tt_abbrind = 0;
1082 for (year = EPOCH_YEAR;
1083 sp->timecnt + 2 <= TZ_MAX_TIMES;
1087 starttime = transtime(janfirst, year, &start,
1089 endtime = transtime(janfirst, year, &end,
1091 if (starttime > endtime) {
1093 *typep++ = 1; /* DST ends */
1095 *typep++ = 0; /* DST begins */
1098 *typep++ = 0; /* DST begins */
1100 *typep++ = 1; /* DST ends */
1103 newfirst = janfirst;
1104 newfirst += year_lengths[isleap(year)] *
1106 if (newfirst <= janfirst)
1108 janfirst = newfirst;
1111 long theirstdoffset;
1112 long theirdstoffset;
1121 ** Initial values of theirstdoffset and theirdstoffset.
1124 for (i = 0; i < sp->timecnt; ++i) {
1126 if (!sp->ttis[j].tt_isdst) {
1128 -sp->ttis[j].tt_gmtoff;
1133 for (i = 0; i < sp->timecnt; ++i) {
1135 if (sp->ttis[j].tt_isdst) {
1137 -sp->ttis[j].tt_gmtoff;
1142 ** Initially we're assumed to be in standard time.
1145 theiroffset = theirstdoffset;
1147 ** Now juggle transition times and types
1148 ** tracking offsets as you do.
1150 for (i = 0; i < sp->timecnt; ++i) {
1152 sp->types[i] = sp->ttis[j].tt_isdst;
1153 if (sp->ttis[j].tt_ttisgmt) {
1154 /* No adjustment to transition time */
1157 ** If summer time is in effect, and the
1158 ** transition time was not specified as
1159 ** standard time, add the summer time
1160 ** offset to the transition time;
1161 ** otherwise, add the standard time
1162 ** offset to the transition time.
1165 ** Transitions from DST to DDST
1166 ** will effectively disappear since
1167 ** POSIX provides for only one DST
1170 if (isdst && !sp->ttis[j].tt_ttisstd) {
1171 sp->ats[i] += dstoffset -
1174 sp->ats[i] += stdoffset -
1178 theiroffset = -sp->ttis[j].tt_gmtoff;
1179 if (sp->ttis[j].tt_isdst)
1180 theirdstoffset = theiroffset;
1181 else theirstdoffset = theiroffset;
1184 ** Finally, fill in ttis.
1185 ** ttisstd and ttisgmt need not be handled.
1187 sp->ttis[0].tt_gmtoff = -stdoffset;
1188 sp->ttis[0].tt_isdst = FALSE;
1189 sp->ttis[0].tt_abbrind = 0;
1190 sp->ttis[1].tt_gmtoff = -dstoffset;
1191 sp->ttis[1].tt_isdst = TRUE;
1192 sp->ttis[1].tt_abbrind = stdlen + 1;
1197 sp->typecnt = 1; /* only standard time */
1199 sp->ttis[0].tt_gmtoff = -stdoffset;
1200 sp->ttis[0].tt_isdst = 0;
1201 sp->ttis[0].tt_abbrind = 0;
1203 sp->charcnt = stdlen + 1;
1205 sp->charcnt += dstlen + 1;
1206 if ((size_t) sp->charcnt > sizeof sp->chars)
1209 (void) strncpy(cp, stdname, stdlen);
1213 (void) strncpy(cp, dstname, dstlen);
1214 *(cp + dstlen) = '\0';
1221 struct state * const sp;
1223 if (tzload(gmt, sp, TRUE) != 0)
1224 (void) tzparse(gmt, sp, TRUE);
1228 tzsetwall_basic(int rdlocked)
1231 _RWLOCK_RDLOCK(&lcl_rwlock);
1232 if (lcl_is_set < 0) {
1234 _RWLOCK_UNLOCK(&lcl_rwlock);
1237 _RWLOCK_UNLOCK(&lcl_rwlock);
1239 _RWLOCK_WRLOCK(&lcl_rwlock);
1243 if (lclptr == NULL) {
1244 lclptr = (struct state *) calloc(1, sizeof *lclptr);
1245 if (lclptr == NULL) {
1246 settzname(); /* all we can do */
1247 _RWLOCK_UNLOCK(&lcl_rwlock);
1249 _RWLOCK_RDLOCK(&lcl_rwlock);
1253 #endif /* defined ALL_STATE */
1254 if (tzload((char *) NULL, lclptr, TRUE) != 0)
1257 _RWLOCK_UNLOCK(&lcl_rwlock);
1260 _RWLOCK_RDLOCK(&lcl_rwlock);
1270 tzset_basic(int rdlocked)
1274 name = getenv("TZ");
1276 tzsetwall_basic(rdlocked);
1281 _RWLOCK_RDLOCK(&lcl_rwlock);
1282 if (lcl_is_set > 0 && strcmp(lcl_TZname, name) == 0) {
1284 _RWLOCK_UNLOCK(&lcl_rwlock);
1287 _RWLOCK_UNLOCK(&lcl_rwlock);
1289 _RWLOCK_WRLOCK(&lcl_rwlock);
1290 lcl_is_set = strlen(name) < sizeof lcl_TZname;
1292 (void) strcpy(lcl_TZname, name);
1295 if (lclptr == NULL) {
1296 lclptr = (struct state *) calloc(1, sizeof *lclptr);
1297 if (lclptr == NULL) {
1298 settzname(); /* all we can do */
1299 _RWLOCK_UNLOCK(&lcl_rwlock);
1301 _RWLOCK_RDLOCK(&lcl_rwlock);
1305 #endif /* defined ALL_STATE */
1306 if (*name == '\0') {
1308 ** User wants it fast rather than right.
1310 lclptr->leapcnt = 0; /* so, we're off a little */
1311 lclptr->timecnt = 0;
1312 lclptr->typecnt = 0;
1313 lclptr->ttis[0].tt_isdst = 0;
1314 lclptr->ttis[0].tt_gmtoff = 0;
1315 lclptr->ttis[0].tt_abbrind = 0;
1316 (void) strcpy(lclptr->chars, gmt);
1317 } else if (tzload(name, lclptr, TRUE) != 0)
1318 if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0)
1319 (void) gmtload(lclptr);
1321 _RWLOCK_UNLOCK(&lcl_rwlock);
1324 _RWLOCK_RDLOCK(&lcl_rwlock);
1334 ** The easy way to behave "as if no library function calls" localtime
1335 ** is to not call it--so we drop its guts into "localsub", which can be
1336 ** freely called. (And no, the PANS doesn't require the above behavior--
1337 ** but it *is* desirable.)
1339 ** The unused offset argument is for the benefit of mktime variants.
1344 localsub(timep, offset, tmp)
1345 const time_t * const timep;
1347 struct tm * const tmp;
1350 const struct ttinfo * ttisp;
1353 const time_t t = *timep;
1358 return gmtsub(timep, offset, tmp);
1359 #endif /* defined ALL_STATE */
1360 if ((sp->goback && t < sp->ats[0]) ||
1361 (sp->goahead && t > sp->ats[sp->timecnt - 1])) {
1363 register time_t seconds;
1364 register time_t tcycles;
1365 register int_fast64_t icycles;
1368 seconds = sp->ats[0] - t;
1369 else seconds = t - sp->ats[sp->timecnt - 1];
1371 tcycles = seconds / YEARSPERREPEAT / AVGSECSPERYEAR;
1374 if (tcycles - icycles >= 1 || icycles - tcycles >= 1)
1377 seconds *= YEARSPERREPEAT;
1378 seconds *= AVGSECSPERYEAR;
1381 else newt -= seconds;
1382 if (newt < sp->ats[0] ||
1383 newt > sp->ats[sp->timecnt - 1])
1384 return NULL; /* "cannot happen" */
1385 result = localsub(&newt, offset, tmp);
1386 if (result == tmp) {
1387 register time_t newy;
1389 newy = tmp->tm_year;
1391 newy -= icycles * YEARSPERREPEAT;
1392 else newy += icycles * YEARSPERREPEAT;
1393 tmp->tm_year = newy;
1394 if (tmp->tm_year != newy)
1399 if (sp->timecnt == 0 || t < sp->ats[0]) {
1401 while (sp->ttis[i].tt_isdst)
1402 if (++i >= sp->typecnt) {
1407 register int lo = 1;
1408 register int hi = sp->timecnt;
1411 register int mid = (lo + hi) >> 1;
1413 if (t < sp->ats[mid])
1417 i = (int) sp->types[lo - 1];
1419 ttisp = &sp->ttis[i];
1421 ** To get (wrong) behavior that's compatible with System V Release 2.0
1422 ** you'd replace the statement below with
1423 ** t += ttisp->tt_gmtoff;
1424 ** timesub(&t, 0L, sp, tmp);
1426 result = timesub(&t, ttisp->tt_gmtoff, sp, tmp);
1427 tmp->tm_isdst = ttisp->tt_isdst;
1428 tzname[tmp->tm_isdst] = &sp->chars[ttisp->tt_abbrind];
1430 tmp->TM_ZONE = &sp->chars[ttisp->tt_abbrind];
1431 #endif /* defined TM_ZONE */
1436 localtime_key_init(void)
1439 localtime_key_error = _pthread_key_create(&localtime_key, free);
1444 const time_t * const timep;
1448 if (__isthreaded != 0) {
1449 _pthread_once(&localtime_once, localtime_key_init);
1450 if (localtime_key_error != 0) {
1451 errno = localtime_key_error;
1454 p_tm = _pthread_getspecific(localtime_key);
1456 if ((p_tm = (struct tm *)malloc(sizeof(struct tm)))
1459 _pthread_setspecific(localtime_key, p_tm);
1461 _RWLOCK_RDLOCK(&lcl_rwlock);
1463 p_tm = localsub(timep, 0L, p_tm);
1464 _RWLOCK_UNLOCK(&lcl_rwlock);
1467 p_tm = localsub(timep, 0L, &tm);
1473 ** Re-entrant version of localtime.
1477 localtime_r(timep, tmp)
1478 const time_t * const timep;
1481 _RWLOCK_RDLOCK(&lcl_rwlock);
1483 tmp = localsub(timep, 0L, tmp);
1484 _RWLOCK_UNLOCK(&lcl_rwlock);
1493 gmtptr = (struct state *) calloc(1, sizeof *gmtptr);
1495 #endif /* defined ALL_STATE */
1500 ** gmtsub is to gmtime as localsub is to localtime.
1504 gmtsub(timep, offset, tmp)
1505 const time_t * const timep;
1507 struct tm * const tmp;
1509 register struct tm * result;
1511 _once(&gmt_once, gmt_init);
1512 result = timesub(timep, offset, gmtptr, tmp);
1515 ** Could get fancy here and deliver something such as
1516 ** "UTC+xxxx" or "UTC-xxxx" if offset is non-zero,
1517 ** but this is no time for a treasure hunt.
1520 tmp->TM_ZONE = wildabbr;
1525 else tmp->TM_ZONE = gmtptr->chars;
1526 #endif /* defined ALL_STATE */
1528 tmp->TM_ZONE = gmtptr->chars;
1529 #endif /* State Farm */
1531 #endif /* defined TM_ZONE */
1536 gmtime_key_init(void)
1539 gmtime_key_error = _pthread_key_create(&gmtime_key, free);
1544 const time_t * const timep;
1548 if (__isthreaded != 0) {
1549 _pthread_once(&gmtime_once, gmtime_key_init);
1550 if (gmtime_key_error != 0) {
1551 errno = gmtime_key_error;
1555 * Changed to follow POSIX.1 threads standard, which
1556 * is what BSD currently has.
1558 if ((p_tm = _pthread_getspecific(gmtime_key)) == NULL) {
1559 if ((p_tm = (struct tm *)malloc(sizeof(struct tm)))
1563 _pthread_setspecific(gmtime_key, p_tm);
1565 gmtsub(timep, 0L, p_tm);
1569 gmtsub(timep, 0L, &tm);
1575 * Re-entrant version of gmtime.
1579 gmtime_r(timep, tmp)
1580 const time_t * const timep;
1583 return gmtsub(timep, 0L, tmp);
1589 offtime(timep, offset)
1590 const time_t * const timep;
1593 return gmtsub(timep, offset, &tm);
1596 #endif /* defined STD_INSPIRED */
1599 ** Return the number of leap years through the end of the given year
1600 ** where, to make the math easy, the answer for year zero is defined as zero.
1604 leaps_thru_end_of(y)
1605 register const int y;
1607 return (y >= 0) ? (y / 4 - y / 100 + y / 400) :
1608 -(leaps_thru_end_of(-(y + 1)) + 1);
1612 timesub(timep, offset, sp, tmp)
1613 const time_t * const timep;
1615 const struct state * const sp;
1616 struct tm * const tmp;
1618 const struct lsinfo * lp;
1620 int idays; /* unsigned would be so 2003 */
1631 i = (sp == NULL) ? 0 : sp->leapcnt;
1632 #endif /* defined ALL_STATE */
1635 #endif /* State Farm */
1638 if (*timep >= lp->ls_trans) {
1639 if (*timep == lp->ls_trans) {
1640 hit = ((i == 0 && lp->ls_corr > 0) ||
1641 lp->ls_corr > sp->lsis[i - 1].ls_corr);
1644 sp->lsis[i].ls_trans ==
1645 sp->lsis[i - 1].ls_trans + 1 &&
1646 sp->lsis[i].ls_corr ==
1647 sp->lsis[i - 1].ls_corr + 1) {
1657 tdays = *timep / SECSPERDAY;
1658 rem = *timep - tdays * SECSPERDAY;
1659 while (tdays < 0 || tdays >= year_lengths[isleap(y)]) {
1661 register time_t tdelta;
1662 register int idelta;
1663 register int leapdays;
1665 tdelta = tdays / DAYSPERLYEAR;
1667 if (tdelta - idelta >= 1 || idelta - tdelta >= 1)
1670 idelta = (tdays < 0) ? -1 : 1;
1672 if (increment_overflow(&newy, idelta))
1674 leapdays = leaps_thru_end_of(newy - 1) -
1675 leaps_thru_end_of(y - 1);
1676 tdays -= ((time_t) newy - y) * DAYSPERNYEAR;
1681 register long seconds;
1683 seconds = tdays * SECSPERDAY + 0.5;
1684 tdays = seconds / SECSPERDAY;
1685 rem += seconds - tdays * SECSPERDAY;
1688 ** Given the range, we can now fearlessly cast...
1691 rem += offset - corr;
1696 while (rem >= SECSPERDAY) {
1701 if (increment_overflow(&y, -1))
1703 idays += year_lengths[isleap(y)];
1705 while (idays >= year_lengths[isleap(y)]) {
1706 idays -= year_lengths[isleap(y)];
1707 if (increment_overflow(&y, 1))
1711 if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE))
1713 tmp->tm_yday = idays;
1715 ** The "extra" mods below avoid overflow problems.
1717 tmp->tm_wday = EPOCH_WDAY +
1718 ((y - EPOCH_YEAR) % DAYSPERWEEK) *
1719 (DAYSPERNYEAR % DAYSPERWEEK) +
1720 leaps_thru_end_of(y - 1) -
1721 leaps_thru_end_of(EPOCH_YEAR - 1) +
1723 tmp->tm_wday %= DAYSPERWEEK;
1724 if (tmp->tm_wday < 0)
1725 tmp->tm_wday += DAYSPERWEEK;
1726 tmp->tm_hour = (int) (rem / SECSPERHOUR);
1728 tmp->tm_min = (int) (rem / SECSPERMIN);
1730 ** A positive leap second requires a special
1731 ** representation. This uses "... ??:59:60" et seq.
1733 tmp->tm_sec = (int) (rem % SECSPERMIN) + hit;
1734 ip = mon_lengths[isleap(y)];
1735 for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon))
1736 idays -= ip[tmp->tm_mon];
1737 tmp->tm_mday = (int) (idays + 1);
1740 tmp->TM_GMTOFF = offset;
1741 #endif /* defined TM_GMTOFF */
1747 const time_t * const timep;
1750 ** Section 4.12.3.2 of X3.159-1989 requires that
1751 ** The ctime function converts the calendar time pointed to by timer
1752 ** to local time in the form of a string. It is equivalent to
1753 ** asctime(localtime(timer))
1755 return asctime(localtime(timep));
1760 const time_t * const timep;
1765 return asctime_r(localtime_r(timep, &mytm), buf);
1769 ** Adapted from code provided by Robert Elz, who writes:
1770 ** The "best" way to do mktime I think is based on an idea of Bob
1771 ** Kridle's (so its said...) from a long time ago.
1772 ** It does a binary search of the time_t space. Since time_t's are
1773 ** just 32 bits, its a max of 32 iterations (even at 64 bits it
1774 ** would still be very reasonable).
1779 #endif /* !defined WRONG */
1782 ** Simplified normalize logic courtesy Paul Eggert.
1786 increment_overflow(number, delta)
1794 return (*number < number0) != (delta < 0);
1798 long_increment_overflow(number, delta)
1806 return (*number < number0) != (delta < 0);
1810 normalize_overflow(tensptr, unitsptr, base)
1811 int * const tensptr;
1812 int * const unitsptr;
1817 tensdelta = (*unitsptr >= 0) ?
1818 (*unitsptr / base) :
1819 (-1 - (-1 - *unitsptr) / base);
1820 *unitsptr -= tensdelta * base;
1821 return increment_overflow(tensptr, tensdelta);
1825 long_normalize_overflow(tensptr, unitsptr, base)
1826 long * const tensptr;
1827 int * const unitsptr;
1830 register int tensdelta;
1832 tensdelta = (*unitsptr >= 0) ?
1833 (*unitsptr / base) :
1834 (-1 - (-1 - *unitsptr) / base);
1835 *unitsptr -= tensdelta * base;
1836 return long_increment_overflow(tensptr, tensdelta);
1841 const struct tm * const atmp;
1842 const struct tm * const btmp;
1846 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 &&
1847 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 &&
1848 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 &&
1849 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 &&
1850 (result = (atmp->tm_min - btmp->tm_min)) == 0)
1851 result = atmp->tm_sec - btmp->tm_sec;
1856 time2sub(tmp, funcp, offset, okayp, do_norm_secs)
1857 struct tm * const tmp;
1858 struct tm * (* const funcp)(const time_t*, long, struct tm*);
1861 const int do_norm_secs;
1863 const struct state * sp;
1873 struct tm yourtm, mytm;
1878 if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec,
1882 if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR))
1884 if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY))
1887 if (long_normalize_overflow(&y, &yourtm.tm_mon, MONSPERYEAR))
1890 ** Turn y into an actual year number for now.
1891 ** It is converted back to an offset from TM_YEAR_BASE later.
1893 if (long_increment_overflow(&y, TM_YEAR_BASE))
1895 while (yourtm.tm_mday <= 0) {
1896 if (long_increment_overflow(&y, -1))
1898 li = y + (1 < yourtm.tm_mon);
1899 yourtm.tm_mday += year_lengths[isleap(li)];
1901 while (yourtm.tm_mday > DAYSPERLYEAR) {
1902 li = y + (1 < yourtm.tm_mon);
1903 yourtm.tm_mday -= year_lengths[isleap(li)];
1904 if (long_increment_overflow(&y, 1))
1908 i = mon_lengths[isleap(y)][yourtm.tm_mon];
1909 if (yourtm.tm_mday <= i)
1911 yourtm.tm_mday -= i;
1912 if (++yourtm.tm_mon >= MONSPERYEAR) {
1914 if (long_increment_overflow(&y, 1))
1918 if (long_increment_overflow(&y, -TM_YEAR_BASE))
1921 if (yourtm.tm_year != y)
1923 /* Don't go below 1900 for POLA */
1924 if (yourtm.tm_year < 0)
1926 if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN)
1928 else if (y + TM_YEAR_BASE < EPOCH_YEAR) {
1930 ** We can't set tm_sec to 0, because that might push the
1931 ** time below the minimum representable time.
1932 ** Set tm_sec to 59 instead.
1933 ** This assumes that the minimum representable time is
1934 ** not in the same minute that a leap second was deleted from,
1935 ** which is a safer assumption than using 58 would be.
1937 if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN))
1939 saved_seconds = yourtm.tm_sec;
1940 yourtm.tm_sec = SECSPERMIN - 1;
1942 saved_seconds = yourtm.tm_sec;
1946 ** Do a binary search (this works whatever time_t's type is).
1948 if (!TYPE_SIGNED(time_t)) {
1951 } else if (!TYPE_INTEGRAL(time_t)) {
1952 if (sizeof(time_t) > sizeof(float))
1953 hi = (time_t) DBL_MAX;
1954 else hi = (time_t) FLT_MAX;
1958 for (i = 0; i < (int) TYPE_BIT(time_t) - 1; ++i)
1963 t = lo / 2 + hi / 2;
1968 if ((*funcp)(&t, offset, &mytm) == NULL) {
1970 ** Assume that t is too extreme to be represented in
1971 ** a struct tm; arrange things so that it is less
1972 ** extreme on the next pass.
1974 dir = (t > 0) ? 1 : -1;
1975 } else dir = tmcomp(&mytm, &yourtm);
1982 } else if (t == hi) {
1995 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst)
1998 ** Right time, wrong type.
1999 ** Hunt for right time, right type.
2000 ** It's okay to guess wrong since the guess
2003 sp = (const struct state *)
2004 ((funcp == localsub) ? lclptr : gmtptr);
2008 #endif /* defined ALL_STATE */
2009 for (i = sp->typecnt - 1; i >= 0; --i) {
2010 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst)
2012 for (j = sp->typecnt - 1; j >= 0; --j) {
2013 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst)
2015 newt = t + sp->ttis[j].tt_gmtoff -
2016 sp->ttis[i].tt_gmtoff;
2017 if ((*funcp)(&newt, offset, &mytm) == NULL)
2019 if (tmcomp(&mytm, &yourtm) != 0)
2021 if (mytm.tm_isdst != yourtm.tm_isdst)
2033 newt = t + saved_seconds;
2034 if ((newt < t) != (saved_seconds < 0))
2037 if ((*funcp)(&t, offset, tmp))
2043 time2(tmp, funcp, offset, okayp)
2044 struct tm * const tmp;
2045 struct tm * (* const funcp)(const time_t*, long, struct tm*);
2052 ** First try without normalization of seconds
2053 ** (in case tm_sec contains a value associated with a leap second).
2054 ** If that fails, try with normalization of seconds.
2056 t = time2sub(tmp, funcp, offset, okayp, FALSE);
2057 return *okayp ? t : time2sub(tmp, funcp, offset, okayp, TRUE);
2061 time1(tmp, funcp, offset)
2062 struct tm * const tmp;
2063 struct tm * (* const funcp)(const time_t *, long, struct tm *);
2067 const struct state * sp;
2069 int sameind, otherind;
2072 int seen[TZ_MAX_TYPES];
2073 int types[TZ_MAX_TYPES];
2081 if (tmp->tm_isdst > 1)
2083 t = time2(tmp, funcp, offset, &okay);
2086 ** PCTS code courtesy Grant Sullivan.
2090 if (tmp->tm_isdst < 0)
2091 tmp->tm_isdst = 0; /* reset to std and try again */
2092 #endif /* defined PCTS */
2094 if (okay || tmp->tm_isdst < 0)
2096 #endif /* !defined PCTS */
2098 ** We're supposed to assume that somebody took a time of one type
2099 ** and did some math on it that yielded a "struct tm" that's bad.
2100 ** We try to divine the type they started from and adjust to the
2103 sp = (const struct state *) ((funcp == localsub) ? lclptr : gmtptr);
2107 #endif /* defined ALL_STATE */
2108 for (i = 0; i < sp->typecnt; ++i)
2111 for (i = sp->timecnt - 1; i >= 0; --i)
2112 if (!seen[sp->types[i]]) {
2113 seen[sp->types[i]] = TRUE;
2114 types[nseen++] = sp->types[i];
2116 for (sameind = 0; sameind < nseen; ++sameind) {
2117 samei = types[sameind];
2118 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst)
2120 for (otherind = 0; otherind < nseen; ++otherind) {
2121 otheri = types[otherind];
2122 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst)
2124 tmp->tm_sec += sp->ttis[otheri].tt_gmtoff -
2125 sp->ttis[samei].tt_gmtoff;
2126 tmp->tm_isdst = !tmp->tm_isdst;
2127 t = time2(tmp, funcp, offset, &okay);
2130 tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff -
2131 sp->ttis[samei].tt_gmtoff;
2132 tmp->tm_isdst = !tmp->tm_isdst;
2140 struct tm * const tmp;
2142 time_t mktime_return_value;
2143 _RWLOCK_RDLOCK(&lcl_rwlock);
2145 mktime_return_value = time1(tmp, localsub, 0L);
2146 _RWLOCK_UNLOCK(&lcl_rwlock);
2147 return(mktime_return_value);
2154 struct tm * const tmp;
2157 tmp->tm_isdst = -1; /* in case it wasn't initialized */
2163 struct tm * const tmp;
2167 return time1(tmp, gmtsub, 0L);
2171 timeoff(tmp, offset)
2172 struct tm * const tmp;
2177 return time1(tmp, gmtsub, offset);
2180 #endif /* defined STD_INSPIRED */
2185 ** The following is supplied for compatibility with
2186 ** previous versions of the CMUCS runtime library.
2191 struct tm * const tmp;
2193 const time_t t = mktime(tmp);
2200 #endif /* defined CMUCS */
2203 ** XXX--is the below the right way to conditionalize??
2209 ** IEEE Std 1003.1-1988 (POSIX) legislates that 536457599
2210 ** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which
2211 ** is not the case if we are accounting for leap seconds.
2212 ** So, we provide the following conversion routines for use
2213 ** when exchanging timestamps with POSIX conforming systems.
2228 if (*timep >= lp->ls_trans)
2239 return t - leapcorr(&t);
2251 ** For a positive leap second hit, the result
2252 ** is not unique. For a negative leap second
2253 ** hit, the corresponding time doesn't exist,
2254 ** so we return an adjacent second.
2256 x = t + leapcorr(&t);
2257 y = x - leapcorr(&x);
2261 y = x - leapcorr(&x);
2268 y = x - leapcorr(&x);
2276 #endif /* defined STD_INSPIRED */