4 /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
5 /* This file has been modified by DJ Delorie. These modifications are
6 ** Copyright (C) 1995 DJ Delorie, 24 Kirsten Ave, Rochester NH,
11 * Copyright (c) 1987, 1989 Regents of the University of California.
12 * All rights reserved.
14 * This code is derived from software contributed to Berkeley by
15 * Arthur David Olson of the National Cancer Institute.
17 * Redistribution and use in source and binary forms are permitted provided
18 * that: (1) source distributions retain this entire copyright notice and
19 * comment, and (2) distributions including binaries display the following
20 * acknowledgement: ``This product includes software developed by the
21 * University of California, Berkeley and its contributors'' in the
22 * documentation or other materials provided with the distribution and in
23 * all advertising materials mentioning features or use of this software.
24 * Neither the name of the University nor the names of its contributors may
25 * be used to endorse or promote products derived from this software without
26 * specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
28 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
29 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
33 ** Leap second handling from Bradley White (bww@k.gp.cs.cmu.edu).
34 ** POSIX-style TZ environment variable handling from Guy Harris
38 #include <msvcrt/fcntl.h>
39 #include <msvcrt/time.h>
40 #include <msvcrt/string.h>
41 #include <msvcrt/ctype.h>
42 #include <msvcrt/stdio.h>
43 #include <msvcrt/stdlib.h>
48 #include <msvcrt/io.h>
54 #define CPP_CONST const
60 #define alloc_size_t size_t
61 #define qsort_size_t size_t
62 #define fread_size_t size_t
63 #define fwrite_size_t size_t
65 #define ACCESS_MODE O_RDONLY|O_BINARY
66 #define OPEN_MODE O_RDONLY|O_BINARY
69 ** Someone might make incorrect use of a time zone abbreviation:
70 ** 1. They might reference tzname[0] before calling tzset (explicitly
72 ** 2. They might reference tzname[1] before calling tzset (explicitly
74 ** 3. They might reference tzname[1] after setting to a time zone
75 ** in which Daylight Saving Time is never observed.
76 ** 4. They might reference tzname[0] after setting to a time zone
77 ** in which Standard Time is never observed.
78 ** 5. They might reference tm.TM_ZONE after calling offtime.
79 ** What's best to do in the above cases is open to debate;
80 ** for now, we just set things up so that in any of the five cases
81 ** WILDABBR is used. Another possibility: initialize tzname[0] to the
82 ** string "tzname[0] used before set", and similarly for the other cases.
83 ** And another: initialize tzname[0] to "ERA", with an explanation in the
84 ** manual page of what this "time zone abbreviation" means (doing this so
85 ** that tzname[0] has the "normal" length of three characters).
88 void _set_daylight_export(int);
89 void _set_timezone_export(int);
92 static char WILDABBR[] = " ";
97 #endif /* !defined TRUE */
99 static const char GMT[] = "GMT";
101 struct ttinfo { /* time type information */
102 long tt_gmtoff; /* GMT offset in seconds */
103 int tt_isdst; /* used to set tm_isdst */
104 int tt_abbrind; /* abbreviation list index */
105 int tt_ttisstd; /* TRUE if transition is std time */
108 struct lsinfo { /* leap second information */
109 time_t ls_trans; /* transition time */
110 long ls_corr; /* correction to apply */
118 time_t ats[TZ_MAX_TIMES];
119 unsigned char types[TZ_MAX_TIMES];
120 struct ttinfo ttis[TZ_MAX_TYPES];
121 char chars[(TZ_MAX_CHARS + 1 > sizeof GMT) ? TZ_MAX_CHARS + 1 : sizeof GMT];
122 struct lsinfo lsis[TZ_MAX_LEAPS];
126 int r_type; /* type of rule--see below */
127 int r_day; /* day number of rule */
128 int r_week; /* week number of rule */
129 int r_mon; /* month number of rule */
130 long r_time; /* transition time of rule */
133 #define JULIAN_DAY 0 /* Jn - Julian day */
134 #define DAY_OF_YEAR 1 /* n - day of year */
135 #define MONTH_NTH_DAY_OF_WEEK 2 /* Mm.n.d - month, week, day of week */
138 ** Prototypes for static functions.
141 static long detzcode P((const char * codep));
142 static const char * getzname P((const char * strp));
143 static const char * getnum P((const char * strp, int * nump, int min, int max));
144 static const char * getsecs P((const char * strp, long * secsp));
145 static const char * getoffset P((const char * strp, long * offsetp));
146 static const char * getrule P((const char * strp, struct rule * rulep));
147 static void gmtload P((struct state * sp));
148 static void gmtsub P((const time_t * timep, long offset, struct tm * tmp));
149 static void localsub P((const time_t * timep, long offset, struct tm * tmp));
150 static void normalize P((int * tensptr, int * unitsptr, int base));
151 static void settzname P((void));
152 static time_t time1 P((struct tm * tmp, void (* funcp)(const time_t * CPP_CONST, const long, struct tm * CPP_CONST), long offset));
153 static time_t time2 P((struct tm *tmp, void (* funcp)(const time_t * CPP_CONST, const long, struct tm * CPP_CONST), long offset, int * okayp));
154 static void timesub P((const time_t * timep, long offset, const struct state * sp, struct tm * tmp));
155 static int tmcomp P((const struct tm * atmp, const struct tm * btmp));
156 static time_t transtime P((time_t janfirst, int year, const struct rule * rulep, long offset));
157 static int tzload P((const char * name, struct state * sp));
158 static int tzparse P((const char * name, struct state * sp, int lastditch));
159 static void tzsetwall(void);
163 static const char * getnum(const char * strp, int * CPP_CONST nump, const int min, const int max);
164 static void timesub(const time_t * CPP_CONST timep, const long offset, const struct state * CPP_CONST sp, struct tm * CPP_CONST tmp);
165 static time_t transtime(const time_t janfirst, const int year, const struct rule * CPP_CONST rulep, const long offset);
166 static void tzsetwall(void);
171 static struct state *lclptr;
172 static struct state *gmtptr;
173 #endif /* defined ALL_STATE */
176 static struct state lclmem;
177 static struct state gmtmem;
178 #define lclptr (&lclmem)
179 #define gmtptr (&gmtmem)
180 #endif /* State Farm */
182 static int lcl_is_set;
183 static int gmt_is_set;
185 char * _tzname[2] = {
191 detzcode(const char * CPP_CONST codep)
197 for (i = 0; i < 4; ++i)
198 result = (result << 8) | (codep[i] & 0xff);
205 const struct state * CPP_CONST sp = lclptr;
208 _tzname[0] = WILDABBR;
209 _tzname[1] = WILDABBR;
213 _tzname[0] = _tzname[1] = GMT;
216 #endif /* defined ALL_STATE */
217 for (i = 0; i < sp->typecnt; ++i)
219 register const struct ttinfo * CPP_CONST ttisp = &sp->ttis[i];
221 _tzname[ttisp->tt_isdst] =
222 (char *)&sp->chars[ttisp->tt_abbrind];
224 if (ttisp->tt_isdst) {
226 _set_daylight_export(1);
228 if (i == 0 || !ttisp->tt_isdst) {
229 //_timezone_dll = -(ttisp->tt_gmtoff);
230 _set_timezone_export(-(ttisp->tt_gmtoff));
232 if (i == 0 || ttisp->tt_isdst) {
233 _altzone = -(ttisp->tt_gmtoff);
238 ** And to get the latest zone names into tzname. . .
240 for (i = 0; i < sp->timecnt; ++i)
242 const struct ttinfo * CPP_CONST ttisp = &sp->ttis[sp->types[i]];
244 _tzname[ttisp->tt_isdst] = (char *)&sp->chars[ttisp->tt_abbrind];
251 static char dir[80]={0}, *cp;
254 if ((cp = getenv("TZDIR")))
258 else if ((cp = getenv("DJDIR")))
261 strcat(dir, "/zoneinfo");
270 tzload(const char *name, struct state * CPP_CONST sp)
275 char fullname[FILENAME_MAX + 1];
276 const struct tzhead * tzhp;
277 char buf[sizeof *sp + sizeof *tzhp];
280 if (name == NULL && (name = TZDEFAULT) == NULL)
287 if ((p = tzdir()) == NULL)
289 if ((strlen(p) + strlen(name) + 1) >= sizeof fullname)
292 strcat(fullname, "/");
293 strcat(fullname, name);
297 if ((fid = open(name, OPEN_MODE)) == -1)
299 const char *base = strrchr(name, '/');
304 if (strcmp(base, "posixrules"))
307 /* We've got a built-in copy of posixrules just in case */
308 memcpy(buf, _posixrules_data, sizeof(_posixrules_data));
309 i = sizeof(_posixrules_data);
313 i = read(fid, buf, sizeof buf);
314 if (close(fid) != 0 || i < sizeof *tzhp)
318 tzhp = (struct tzhead *) buf;
319 ttisstdcnt = (int) detzcode(tzhp->tzh_ttisstdcnt);
320 sp->leapcnt = (int) detzcode(tzhp->tzh_leapcnt);
321 sp->timecnt = (int) detzcode(tzhp->tzh_timecnt);
322 sp->typecnt = (int) detzcode(tzhp->tzh_typecnt);
323 sp->charcnt = (int) detzcode(tzhp->tzh_charcnt);
324 if (sp->leapcnt < 0 || sp->leapcnt > TZ_MAX_LEAPS ||
325 sp->typecnt <= 0 || sp->typecnt > TZ_MAX_TYPES ||
326 sp->timecnt < 0 || sp->timecnt > TZ_MAX_TIMES ||
327 sp->charcnt < 0 || sp->charcnt > TZ_MAX_CHARS ||
328 (ttisstdcnt != sp->typecnt && ttisstdcnt != 0))
330 if (i < sizeof *tzhp +
331 sp->timecnt * (4 + sizeof (char)) +
332 sp->typecnt * (4 + 2 * sizeof (char)) +
333 sp->charcnt * sizeof (char) +
334 sp->leapcnt * 2 * 4 +
335 ttisstdcnt * sizeof (char))
337 p = buf + sizeof *tzhp;
338 for (i = 0; i < sp->timecnt; ++i)
340 sp->ats[i] = detzcode(p);
343 for (i = 0; i < sp->timecnt; ++i)
345 sp->types[i] = (unsigned char) *p++;
346 if (sp->types[i] >= sp->typecnt)
349 for (i = 0; i < sp->typecnt; ++i)
351 struct ttinfo * ttisp;
353 ttisp = &sp->ttis[i];
354 ttisp->tt_gmtoff = detzcode(p);
356 ttisp->tt_isdst = (unsigned char) *p++;
357 if (ttisp->tt_isdst != 0 && ttisp->tt_isdst != 1)
359 ttisp->tt_abbrind = (unsigned char) *p++;
360 if (ttisp->tt_abbrind < 0 ||
361 ttisp->tt_abbrind > sp->charcnt)
364 for (i = 0; i < sp->charcnt; ++i)
366 sp->chars[i] = '\0'; /* ensure '\0' at end */
367 for (i = 0; i < sp->leapcnt; ++i)
369 struct lsinfo * lsisp;
371 lsisp = &sp->lsis[i];
372 lsisp->ls_trans = detzcode(p);
374 lsisp->ls_corr = detzcode(p);
377 for (i = 0; i < sp->typecnt; ++i)
379 struct ttinfo * ttisp;
381 ttisp = &sp->ttis[i];
383 ttisp->tt_ttisstd = FALSE;
386 ttisp->tt_ttisstd = *p++;
387 if (ttisp->tt_ttisstd != TRUE &&
388 ttisp->tt_ttisstd != FALSE)
395 static const int mon_lengths[2][MONSPERYEAR] = {
396 { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
397 { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
400 static const int year_lengths[2] = {
401 DAYSPERNYEAR, DAYSPERLYEAR
405 ** Given a pointer into a time zone string, scan until a character that is not
406 ** a valid character in a zone name is found. Return a pointer to that
411 getzname(const char *strp)
415 while ((c = *strp) != '\0' && !isdigit(c) && c != ',' && c != '-' &&
422 ** Given a pointer into a time zone string, extract a number from that string.
423 ** Check that the number is within a specified range; if it is not, return
425 ** Otherwise, return a pointer to the first character not part of the number.
429 getnum(const char *strp, int * CPP_CONST nump, const int min, const int max)
434 if (strp == NULL || !isdigit(*strp))
437 while ((c = *strp) != '\0' && isdigit(c))
439 num = num * 10 + (c - '0');
451 ** Given a pointer into a time zone string, extract a number of seconds,
452 ** in hh[:mm[:ss]] form, from the string.
453 ** If any error occurs, return NULL.
454 ** Otherwise, return a pointer to the first character not part of the number
459 getsecs(const char *strp, long * CPP_CONST secsp)
463 strp = getnum(strp, &num, 0, HOURSPERDAY);
466 *secsp = num * SECSPERHOUR;
470 strp = getnum(strp, &num, 0, MINSPERHOUR - 1);
473 *secsp += num * SECSPERMIN;
477 strp = getnum(strp, &num, 0, SECSPERMIN - 1);
487 ** Given a pointer into a time zone string, extract an offset, in
488 ** [+-]hh[:mm[:ss]] form, from the string.
489 ** If any error occurs, return NULL.
490 ** Otherwise, return a pointer to the first character not part of the time.
494 getoffset(const char *strp, long * CPP_CONST offsetp)
503 else if (isdigit(*strp) || *strp++ == '+')
506 return NULL; /* illegal offset */
507 strp = getsecs(strp, offsetp);
509 return NULL; /* illegal time */
511 *offsetp = -*offsetp;
516 ** Given a pointer into a time zone string, extract a rule in the form
517 ** date[/time]. See POSIX section 8 for the format of "date" and "time".
518 ** If a valid rule is not found, return NULL.
519 ** Otherwise, return a pointer to the first character not part of the rule.
523 getrule(const char *strp, struct rule * CPP_CONST rulep)
530 rulep->r_type = JULIAN_DAY;
532 strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR);
534 else if (*strp == 'M')
539 rulep->r_type = MONTH_NTH_DAY_OF_WEEK;
541 strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR);
546 strp = getnum(strp, &rulep->r_week, 1, 5);
551 strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1);
553 else if (isdigit(*strp))
558 rulep->r_type = DAY_OF_YEAR;
559 strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1);
562 return NULL; /* invalid format */
571 strp = getsecs(strp, &rulep->r_time);
574 rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */
579 ** Given the Epoch-relative time of January 1, 00:00:00 GMT, in a year, the
580 ** year, a rule, and the offset from GMT at the time that rule takes effect,
581 ** calculate the Epoch-relative time that rule takes effect.
585 transtime(const time_t janfirst, const int year, const struct rule * CPP_CONST rulep, const long offset)
590 int d, m1, yy0, yy1, yy2, dow;
592 leapyear = isleap(year);
593 switch (rulep->r_type)
598 ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap
600 ** In non-leap years, or if the day number is 59 or less, just
601 ** add SECSPERDAY times the day number-1 to the time of
602 ** January 1, midnight, to get the day.
604 value = janfirst + (rulep->r_day - 1) * SECSPERDAY;
605 if (leapyear && rulep->r_day >= 60)
612 ** Just add SECSPERDAY times the day number to the time of
613 ** January 1, midnight, to get the day.
615 value = janfirst + rulep->r_day * SECSPERDAY;
618 case MONTH_NTH_DAY_OF_WEEK:
620 ** Mm.n.d - nth "dth day" of month m.
623 for (i = 0; i < rulep->r_mon - 1; ++i)
624 value += mon_lengths[leapyear][i] * SECSPERDAY;
627 ** Use Zeller's Congruence to get day-of-week of first day of
630 m1 = (rulep->r_mon + 9) % 12 + 1;
631 yy0 = (rulep->r_mon <= 2) ? (year - 1) : year;
634 dow = ((26 * m1 - 2) / 10 +
635 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7;
640 ** "dow" is the day-of-week of the first day of the month. Get
641 ** the day-of-month (zero-origin) of the first "dow" day of the
644 d = rulep->r_day - dow;
647 for (i = 1; i < rulep->r_week; ++i)
649 if (d + DAYSPERWEEK >=
650 mon_lengths[leapyear][rulep->r_mon - 1])
656 ** "d" is the day-of-month (zero-origin) of the day we want.
658 value += d * SECSPERDAY;
663 ** "value" is the Epoch-relative time of 00:00:00 GMT on the day in
664 ** question. To get the Epoch-relative time of the specified local
665 ** time on that day, add the transition time and the current offset
668 return value + rulep->r_time + offset;
672 ** Given a POSIX section 8-style TZ string, fill in the rule tables as
677 tzparse(const char *name, struct state * CPP_CONST sp, const int lastditch)
679 const char * stdname;
680 const char * dstname=0;
686 unsigned char * typep;
693 stdlen = strlen(name); /* length of standard zone name */
695 if (stdlen >= sizeof sp->chars)
696 stdlen = (sizeof sp->chars) - 1;
700 name = getzname(name);
701 stdlen = name - stdname;
709 name = getoffset(name, &stdoffset);
713 load_result = tzload(TZDEFRULES, sp);
714 if (load_result != 0)
715 sp->leapcnt = 0; /* so, we're off a little */
719 name = getzname(name);
720 dstlen = name - dstname; /* length of DST zone name */
723 if (*name != '\0' && *name != ',' && *name != ';')
725 name = getoffset(name, &dstoffset);
730 dstoffset = stdoffset - SECSPERHOUR;
731 if (*name == ',' || *name == ';')
741 if ((name = getrule(name, &start)) == NULL)
745 if ((name = getrule(name, &end)) == NULL)
749 sp->typecnt = 2; /* standard time and DST */
751 ** Two transitions per year, from EPOCH_YEAR to 2037.
753 sp->timecnt = 2 * (2037 - EPOCH_YEAR + 1);
754 if (sp->timecnt > TZ_MAX_TIMES)
756 sp->ttis[0].tt_gmtoff = -dstoffset;
757 sp->ttis[0].tt_isdst = 1;
758 sp->ttis[0].tt_abbrind = stdlen + 1;
759 sp->ttis[1].tt_gmtoff = -stdoffset;
760 sp->ttis[1].tt_isdst = 0;
761 sp->ttis[1].tt_abbrind = 0;
765 for (year = EPOCH_YEAR; year <= 2037; ++year)
767 starttime = transtime(janfirst, year, &start,
769 endtime = transtime(janfirst, year, &end,
771 if (starttime > endtime)
774 *typep++ = 1; /* DST ends */
776 *typep++ = 0; /* DST begins */
781 *typep++ = 0; /* DST begins */
783 *typep++ = 1; /* DST ends */
786 year_lengths[isleap(year)] * SECSPERDAY;
801 if (load_result != 0)
804 ** Compute the difference between the real and
805 ** prototype standard and summer time offsets
806 ** from GMT, and put the real standard and summer
807 ** time offsets into the rules in place of the
808 ** prototype offsets.
814 for (i = 0; i < sp->typecnt; ++i)
816 if (sp->ttis[i].tt_isdst)
820 sp->ttis[i].tt_gmtoff + dstoffset;
821 if (sawdst && (oldfix != dstfix))
823 sp->ttis[i].tt_gmtoff = -dstoffset;
824 sp->ttis[i].tt_abbrind = stdlen + 1;
831 sp->ttis[i].tt_gmtoff + stdoffset;
832 if (sawstd && (oldfix != stdfix))
834 sp->ttis[i].tt_gmtoff = -stdoffset;
835 sp->ttis[i].tt_abbrind = 0;
840 ** Make sure we have both standard and summer time.
842 if (!sawdst || !sawstd)
845 ** Now correct the transition times by shifting
846 ** them by the difference between the real and
847 ** prototype offsets. Note that this difference
848 ** can be different in standard and summer time;
849 ** the prototype probably has a 1-hour difference
850 ** between standard and summer time, but a different
851 ** difference can be specified in TZ.
853 isdst = FALSE; /* we start in standard time */
854 for (i = 0; i < sp->timecnt; ++i)
856 const struct ttinfo * ttisp;
859 ** If summer time is in effect, and the
860 ** transition time was not specified as
861 ** standard time, add the summer time
862 ** offset to the transition time;
863 ** otherwise, add the standard time offset
864 ** to the transition time.
866 ttisp = &sp->ttis[sp->types[i]];
868 (isdst && !ttisp->tt_ttisstd) ?
870 isdst = ttisp->tt_isdst;
877 sp->typecnt = 1; /* only standard time */
879 sp->ttis[0].tt_gmtoff = -stdoffset;
880 sp->ttis[0].tt_isdst = 0;
881 sp->ttis[0].tt_abbrind = 0;
883 sp->charcnt = stdlen + 1;
885 sp->charcnt += dstlen + 1;
886 if (sp->charcnt > sizeof sp->chars)
889 (void) strncpy(cp, stdname, stdlen);
894 (void) strncpy(cp, dstname, dstlen);
895 *(cp + dstlen) = '\0';
901 gmtload(struct state * CPP_CONST sp)
903 if (tzload(GMT, sp) != 0)
904 (void) tzparse(GMT, sp, TRUE);
925 lclptr = (struct state *) malloc(sizeof *lclptr);
928 settzname(); /* all we can do */
932 #endif /* defined ALL_STATE */
936 ** User wants it fast rather than right.
938 lclptr->leapcnt = 0; /* so, we're off a little */
940 lclptr->ttis[0].tt_gmtoff = 0;
941 lclptr->ttis[0].tt_abbrind = 0;
942 (void) strcpy(lclptr->chars, GMT);
944 else if (tzload(name, lclptr) != 0)
945 if (name[0] == ':' || tzparse(name, lclptr, FALSE) != 0)
957 lclptr = (struct state *) malloc(sizeof *lclptr);
960 settzname(); /* all we can do */
964 #endif /* defined ALL_STATE */
965 if (tzload((char *) NULL, lclptr) != 0)
971 ** The easy way to behave "as if no library function calls" localtime
972 ** is to not call it--so we drop its guts into "localsub", which can be
973 ** freely called. (And no, the PANS doesn't require the above behavior--
974 ** but it *is* desirable.)
976 ** The unused offset argument is for the benefit of mktime variants.
981 localsub(const time_t * CPP_CONST timep, const long offset, struct tm * CPP_CONST tmp)
983 const struct state * sp;
984 const struct ttinfo * ttisp;
986 const time_t t = *timep;
994 gmtsub(timep, offset, tmp);
997 #endif /* defined ALL_STATE */
998 if (sp->timecnt == 0 || t < sp->ats[0])
1001 while (sp->ttis[i].tt_isdst)
1002 if (++i >= sp->typecnt)
1010 for (i = 1; i < sp->timecnt; ++i)
1013 i = sp->types[i - 1];
1015 ttisp = &sp->ttis[i];
1017 ** To get (wrong) behavior that's compatible with System V Release 2.0
1018 ** you'd replace the statement below with
1019 ** t += ttisp->tt_gmtoff;
1020 ** timesub(&t, 0L, sp, tmp);
1022 timesub(&t, ttisp->tt_gmtoff, sp, tmp);
1023 tmp->tm_isdst = ttisp->tt_isdst;
1024 _tzname[tmp->tm_isdst] = (char *)&sp->chars[ttisp->tt_abbrind];
1025 tmp->tm_zone = (char *)&sp->chars[ttisp->tt_abbrind];
1032 localtime(const time_t * CPP_CONST timep)
1034 static struct tm tm;
1036 localsub(timep, 0L, &tm);
1041 ** gmtsub is to gmtime as localsub is to localtime.
1045 gmtsub(const time_t * CPP_CONST timep, const long offset, struct tm * CPP_CONST tmp)
1051 gmtptr = (struct state *) malloc(sizeof *gmtptr);
1053 #endif /* defined ALL_STATE */
1056 timesub(timep, offset, gmtptr, tmp);
1058 ** Could get fancy here and deliver something such as
1059 ** "GMT+xxxx" or "GMT-xxxx" if offset is non-zero,
1060 ** but this is no time for a treasure hunt.
1063 tmp->tm_zone = WILDABBR;
1070 tmp->TM_ZONE = gmtptr->chars;
1071 #endif /* defined ALL_STATE */
1073 tmp->tm_zone = gmtptr->chars;
1074 #endif /* State Farm */
1082 gmtime(const time_t * CPP_CONST timep)
1084 static struct tm tm;
1086 gmtsub(timep, 0L, &tm);
1091 timesub(const time_t * CPP_CONST timep, const long offset, const struct state * CPP_CONST sp, struct tm * CPP_CONST tmp)
1093 const struct lsinfo * lp;
1106 i = (sp == NULL) ? 0 : sp->leapcnt;
1107 #endif /* defined ALL_STATE */
1110 #endif /* State Farm */
1114 if (*timep >= lp->ls_trans)
1116 if (*timep == lp->ls_trans)
1117 hit = ((i == 0 && lp->ls_corr > 0) ||
1118 lp->ls_corr > sp->lsis[i - 1].ls_corr);
1123 days = *timep / SECSPERDAY;
1124 rem = *timep % SECSPERDAY;
1126 if (*timep == 0x80000000)
1129 ** A 3B1 muffs the division on the most negative number.
1135 rem += (offset - corr);
1141 while (rem >= SECSPERDAY)
1146 tmp->tm_hour = (int) (rem / SECSPERHOUR);
1147 rem = rem % SECSPERHOUR;
1148 tmp->tm_min = (int) (rem / SECSPERMIN);
1149 tmp->tm_sec = (int) (rem % SECSPERMIN);
1152 ** A positive leap second requires a special
1153 ** representation. This uses "... ??:59:60".
1156 tmp->tm_wday = (int) ((EPOCH_WDAY + days) % DAYSPERWEEK);
1157 if (tmp->tm_wday < 0)
1158 tmp->tm_wday += DAYSPERWEEK;
1164 if (days < (long) year_lengths[yleap])
1167 days = days - (long) year_lengths[yleap];
1173 days = days + (long) year_lengths[yleap];
1175 tmp->tm_year = y - TM_YEAR_BASE;
1176 tmp->tm_yday = (int) days;
1177 ip = mon_lengths[yleap];
1178 for (tmp->tm_mon = 0; days >= (long) ip[tmp->tm_mon]; ++(tmp->tm_mon))
1179 days = days - (long) ip[tmp->tm_mon];
1180 tmp->tm_mday = (int) (days + 1);
1182 tmp->tm_gmtoff = offset;
1193 asctime(const struct tm *timeptr)
1195 static const char wday_name[DAYSPERWEEK][3] = {
1196 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
1198 static const char mon_name[MONSPERYEAR][3] = {
1199 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
1200 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
1202 static char result[26];
1204 (void) sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
1205 wday_name[timeptr->tm_wday],
1206 mon_name[timeptr->tm_mon],
1207 timeptr->tm_mday, timeptr->tm_hour,
1208 timeptr->tm_min, timeptr->tm_sec,
1209 TM_YEAR_BASE + timeptr->tm_year);
1217 ctime(const time_t * CPP_CONST timep)
1219 return asctime(localtime(timep));
1223 ** Adapted from code provided by Robert Elz, who writes:
1224 ** The "best" way to do mktime I think is based on an idea of Bob
1225 ** Kridle's (so its said...) from a long time ago. (mtxinu!kridle now).
1226 ** It does a binary search of the time_t space. Since time_t's are
1227 ** just 32 bits, its a max of 32 iterations (even at 64 bits it
1228 ** would still be very reasonable).
1233 #endif /* !defined WRONG */
1236 normalize(int * CPP_CONST tensptr, int * CPP_CONST unitsptr, const int base)
1238 if (*unitsptr >= base)
1240 *tensptr += *unitsptr / base;
1243 else if (*unitsptr < 0)
1249 *tensptr -= 1 + (-*unitsptr) / base;
1250 *unitsptr = base - (-*unitsptr) % base;
1256 tmcomp(const struct tm * CPP_CONST atmp, const struct tm * CPP_CONST btmp)
1260 if ((result = (atmp->tm_year - btmp->tm_year)) == 0 &&
1261 (result = (atmp->tm_mon - btmp->tm_mon)) == 0 &&
1262 (result = (atmp->tm_mday - btmp->tm_mday)) == 0 &&
1263 (result = (atmp->tm_hour - btmp->tm_hour)) == 0 &&
1264 (result = (atmp->tm_min - btmp->tm_min)) == 0)
1265 result = atmp->tm_sec - btmp->tm_sec;
1270 time2(struct tm *tmp, void (*const funcp)(const time_t * CPP_CONST, const long, struct tm *), const long offset, int * CPP_CONST okayp)
1272 const struct state * sp;
1279 struct tm yourtm, mytm;
1283 if (yourtm.tm_sec >= SECSPERMIN + 2 || yourtm.tm_sec < 0)
1284 normalize(&yourtm.tm_min, &yourtm.tm_sec, SECSPERMIN);
1285 normalize(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR);
1286 normalize(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY);
1287 normalize(&yourtm.tm_year, &yourtm.tm_mon, MONSPERYEAR);
1288 while (yourtm.tm_mday <= 0)
1292 year_lengths[isleap(yourtm.tm_year + TM_YEAR_BASE)];
1296 i = mon_lengths[isleap(yourtm.tm_year +
1297 TM_YEAR_BASE)][yourtm.tm_mon];
1298 if (yourtm.tm_mday <= i)
1300 yourtm.tm_mday -= i;
1301 if (++yourtm.tm_mon >= MONSPERYEAR)
1307 saved_seconds = yourtm.tm_sec;
1310 ** Calculate the number of magnitude bits in a time_t
1311 ** (this works regardless of whether time_t is
1312 ** signed or unsigned, though lint complains if unsigned).
1314 for (bits = 0, t = 1; t > 0; ++bits, t <<= 1)
1317 ** If time_t is signed, then 0 is the median value,
1318 ** if time_t is unsigned, then 1 << bits is median.
1321 t = (time_t) ((1 << bits) - 1);
1322 #else // TODO: FIXME: review which is correct
1323 t = (time_t) 1 << bits;
1324 #endif /*_MSVCRT_LIB_*/
1328 (*funcp)(&t, offset, &mytm);
1329 dir = tmcomp(&mytm, &yourtm);
1337 t -= (time_t) 1 << bits;
1338 else t += (time_t) 1 << bits;
1341 if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst)
1344 ** Right time, wrong type.
1345 ** Hunt for right time, right type.
1346 ** It's okay to guess wrong since the guess
1349 sp = (const struct state *)
1350 ((funcp == localsub) ? lclptr : gmtptr);
1354 #endif /* defined ALL_STATE */
1355 for (i = 0; i < sp->typecnt; ++i)
1357 if (sp->ttis[i].tt_isdst != yourtm.tm_isdst)
1359 for (j = 0; j < sp->typecnt; ++j)
1361 if (sp->ttis[j].tt_isdst == yourtm.tm_isdst)
1363 newt = t + sp->ttis[j].tt_gmtoff -
1364 sp->ttis[i].tt_gmtoff;
1365 (*funcp)(&newt, offset, &mytm);
1366 if (tmcomp(&mytm, &yourtm) != 0)
1368 if (mytm.tm_isdst != yourtm.tm_isdst)
1381 (*funcp)(&t, offset, tmp);
1387 time1(struct tm * CPP_CONST tmp, void (*const funcp)(const time_t * CPP_CONST, const long, struct tm *), const long offset)
1390 const struct state * sp;
1394 if (tmp->tm_isdst > 1)
1396 t = time2(tmp, funcp, offset, &okay);
1397 if (okay || tmp->tm_isdst < 0)
1400 ** We're supposed to assume that somebody took a time of one type
1401 ** and did some math on it that yielded a "struct tm" that's bad.
1402 ** We try to divine the type they started from and adjust to the
1405 sp = (const struct state *) ((funcp == localsub) ? lclptr : gmtptr);
1409 #endif /* defined ALL_STATE */
1410 for (samei = 0; samei < sp->typecnt; ++samei)
1412 if (sp->ttis[samei].tt_isdst != tmp->tm_isdst)
1414 for (otheri = 0; otheri < sp->typecnt; ++otheri)
1416 if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst)
1418 tmp->tm_sec += sp->ttis[otheri].tt_gmtoff -
1419 sp->ttis[samei].tt_gmtoff;
1420 tmp->tm_isdst = !tmp->tm_isdst;
1421 t = time2(tmp, funcp, offset, &okay);
1424 tmp->tm_sec -= sp->ttis[otheri].tt_gmtoff -
1425 sp->ttis[samei].tt_gmtoff;
1426 tmp->tm_isdst = !tmp->tm_isdst;
1436 mktime(struct tm * tmp)
1438 return time1(tmp, localsub, 0L);