forked from KolibriOS/kolibrios
814 lines
25 KiB
C
814 lines
25 KiB
C
/*
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Copyright (c) 1990-2001 Info-ZIP. All rights reserved.
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See the accompanying file LICENSE, version 2000-Apr-09 or later
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(the contents of which are also included in zip.h) for terms of use.
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If, for some reason, all these files are missing, the Info-ZIP license
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also may be found at: ftp://ftp.info-zip.org/pub/infozip/license.html
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*/
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/* Replacement time library functions, based on platform independent public
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* domain timezone code from ftp://elsie.nci.nih.gov/pub, with mktime and
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* mkgmtime from our own mktime.c in Zip.
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*
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* Contains: tzset()
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* __tzset()
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* gmtime()
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* localtime()
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* mktime()
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* mkgmtime()
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* GetPlatformLocalTimezone() [different versions]
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*/
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/* HISTORY/CHANGES
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* 17 Jun 00, Paul Kienitz, added the PD-based tzset(), localtime(), and so on
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* to amiga/filedate.c, replacing GNU-based functions which had
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* replaced time_lib.c, both having been rejected for licensing
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* reasons. Support for timezone files and leap seconds was removed.
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*
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* 23 Aug 00, Paul Kienitz, split into separate timezone.c file, made platform
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* independent, copied in mktime() and mkgmtime() from Zip, renamed
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* locale_TZ as GetPlatformLocalTimezone(), for use as a generic
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* hook by other platforms.
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*/
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#ifndef __timezone_c
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#define __timezone_c
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#include "zip.h"
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#include "timezone.h"
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#include <ctype.h>
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#include <errno.h>
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#ifdef IZTZ_DEFINESTDGLOBALS
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long timezone = 0;
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int daylight = 0;
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char *tzname[2];
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#endif
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#ifndef IZTZ_GETLOCALETZINFO
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# define IZTZ_GETLOCALETZINFO(ptzstruct, pgenrulefunct) (FALSE)
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#endif
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int real_timezone_is_set = FALSE; /* set by tzset() */
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#define TZDEFRULESTRING ",M4.1.0,M10.5.0"
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#define TZDEFAULT "EST5EDT"
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#define SECSPERMIN 60
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#define MINSPERHOUR 60
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#define HOURSPERDAY 24
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#define DAYSPERWEEK 7
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#define DAYSPERNYEAR 365
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#define DAYSPERLYEAR 366
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#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
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#define SECSPERDAY ((long) SECSPERHOUR * HOURSPERDAY)
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#define MONSPERYEAR 12
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#define EPOCH_WDAY 4 /* Jan 1, 1970 was thursday */
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#define EPOCH_YEAR 1970
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#define TM_YEAR_BASE 1900
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#define FIRST_GOOD_YEAR ((time_t) -1 < (time_t) 1 ? EPOCH_YEAR-68 : EPOCH_YEAR)
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#define LAST_GOOD_YEAR (EPOCH_YEAR + ((time_t) -1 < (time_t) 1 ? 67 : 135))
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#define YDAYS(month, year) yr_days[leap(year)][month]
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/* Nonzero if `y' is a leap year, else zero. */
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#define leap(y) (((y) % 4 == 0 && (y) % 100 != 0) || (y) % 400 == 0)
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/* Number of leap years from EPOCH_YEAR to `y' (not including `y' itself). */
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#define _P4 ((EPOCH_YEAR / 4) * 4 + 1)
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#define _P100 ((EPOCH_YEAR / 100) * 100 + 1)
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#define _P400 ((EPOCH_YEAR / 400) * 400 + 1)
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#define nleap(y) (((y) - _P4) / 4 - ((y) - _P100) / 100 + ((y) - _P400) / 400)
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/* Length of month `m' (0 .. 11) */
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#define monthlen(m, y) (yr_days[0][(m)+1] - yr_days[0][m] + \
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((m) == 1 && leap(y)))
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/* internal module-level constants */
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#ifndef IZ_MKTIME_ONLY
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static ZCONST char gmt[] = "GMT";
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static ZCONST int mon_lengths[2][MONSPERYEAR] = {
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{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
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{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
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};
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#endif /* !IZ_MKTIME_ONLY */
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static ZCONST int yr_days[2][MONSPERYEAR+1] = {
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{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
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{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
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};
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#ifndef IZ_MKTIME_ONLY
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static ZCONST int year_lengths[2] = {
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DAYSPERNYEAR, DAYSPERLYEAR
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};
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/* internal variables */
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static struct state statism;
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/* prototypes of static functions */
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static time_t transtime OF((ZCONST time_t janfirst, ZCONST int year,
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ZCONST struct rule * ZCONST rulep,
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ZCONST long offset));
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static void generate_transitions OF((register struct state * ZCONST sp,
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ZCONST struct rule * ZCONST start,
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ZCONST struct rule * ZCONST end));
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static ZCONST char *getzname OF((ZCONST char *strp));
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static ZCONST char *getnum OF((ZCONST char *strp, int * ZCONST nump,
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ZCONST int min, ZCONST int max));
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static ZCONST char *getsecs OF((ZCONST char *strp, long * ZCONST secsp));
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static ZCONST char *getoffset OF((ZCONST char *strp, long * ZCONST offsetp));
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static ZCONST char *getrule OF((ZCONST char *strp, struct rule * ZCONST rulep));
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static int Parse_TZ OF((ZCONST char *name, register struct state * ZCONST sp));
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static time_t transtime(janfirst, year, rulep, offset)
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ZCONST time_t janfirst;
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ZCONST int year;
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ZCONST struct rule * ZCONST rulep;
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ZCONST long offset;
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{
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register int leapyear;
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register time_t value;
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register int i;
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int d, m1, yy0, yy1, yy2, dow;
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value = 0;
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leapyear = leap(year);
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switch (rulep->r_type) {
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case JULIAN_DAY:
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/*
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** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap
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** years.
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** In non-leap years, or if the day number is 59 or less, just
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** add SECSPERDAY times the day number-1 to the time of
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** January 1, midnight, to get the day.
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*/
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value = janfirst + (rulep->r_day - 1) * SECSPERDAY;
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if (leapyear && rulep->r_day >= 60)
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value += SECSPERDAY;
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break;
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case DAY_OF_YEAR:
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/*
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** n - day of year.
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** Just add SECSPERDAY times the day number to the time of
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** January 1, midnight, to get the day.
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*/
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value = janfirst + rulep->r_day * SECSPERDAY;
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break;
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case MONTH_NTH_DAY_OF_WEEK:
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/*
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** Mm.n.d - nth "dth day" of month m.
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*/
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value = janfirst;
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/*
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for (i = 0; i < rulep->r_mon - 1; ++i)
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value += mon_lengths[leapyear][i] * SECSPERDAY;
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*/
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value += yr_days[leapyear][rulep->r_mon - 1] * SECSPERDAY;
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/*
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** Use Zeller's Congruence to get day-of-week of first day of
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** month.
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*/
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m1 = (rulep->r_mon + 9) % 12 + 1;
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yy0 = (rulep->r_mon <= 2) ? (year - 1) : year;
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yy1 = yy0 / 100;
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yy2 = yy0 % 100;
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dow = ((26 * m1 - 2) / 10 +
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1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7;
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if (dow < 0)
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dow += DAYSPERWEEK;
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/*
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** "dow" is the day-of-week of the first day of the month. Get
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** the day-of-month (zero-origin) of the first "dow" day of the
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** month.
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*/
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d = rulep->r_day - dow;
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if (d < 0)
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d += DAYSPERWEEK;
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for (i = 1; i < rulep->r_week; ++i) {
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if (d + DAYSPERWEEK >= mon_lengths[leapyear][rulep->r_mon - 1])
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break;
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d += DAYSPERWEEK;
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}
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/*
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** "d" is the day-of-month (zero-origin) of the day we want.
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*/
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value += d * SECSPERDAY;
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break;
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}
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/*
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** "value" is the Epoch-relative time of 00:00:00 UTC on the day in
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** question. To get the Epoch-relative time of the specified local
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** time on that day, add the transition time and the current offset
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** from UTC.
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*/
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return value + rulep->r_time + offset;
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}
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static void generate_transitions(sp, start, end)
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register struct state * ZCONST sp;
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ZCONST struct rule * ZCONST start;
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ZCONST struct rule * ZCONST end;
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{
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register int year;
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register time_t janfirst;
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time_t starttime;
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time_t endtime;
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long stdoffset = -sp->ttis[0].tt_gmtoff;
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long dstoffset = -sp->ttis[1].tt_gmtoff;
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register time_t * atp;
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register unsigned char * typep;
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/*
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** Two transitions per year, from EPOCH_YEAR to LAST_GOOD_YEAR.
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*/
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sp->timecnt = 2 * (LAST_GOOD_YEAR - EPOCH_YEAR + 1);
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atp = sp->ats;
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typep = sp->types;
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janfirst = 0;
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for (year = EPOCH_YEAR; year <= LAST_GOOD_YEAR; ++year) {
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starttime = transtime(janfirst, year, start, stdoffset);
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endtime = transtime(janfirst, year, end, dstoffset);
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if (starttime > endtime) {
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*atp++ = endtime;
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*typep++ = 0; /* DST ends */
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*atp++ = starttime;
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*typep++ = 1; /* DST begins */
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} else {
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*atp++ = starttime;
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*typep++ = 1; /* DST begins */
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*atp++ = endtime;
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*typep++ = 0; /* DST ends */
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}
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janfirst += year_lengths[leap(year)] * SECSPERDAY;
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}
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}
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static ZCONST char *getzname(strp)
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ZCONST char *strp;
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{
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register char c;
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while ((c = *strp) != '\0' && !isdigit(c) && c != ',' && c != '-' &&
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c != '+')
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++strp;
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return strp;
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}
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static ZCONST char *getnum(strp, nump, min, max)
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ZCONST char *strp;
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int * ZCONST nump;
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ZCONST int min;
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ZCONST int max;
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{
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register char c;
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register int num;
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if (strp == NULL || !isdigit(c = *strp))
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return NULL;
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num = 0;
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do {
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num = num * 10 + (c - '0');
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if (num > max)
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return NULL; /* illegal value */
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c = *++strp;
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} while (isdigit(c));
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if (num < min)
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return NULL; /* illegal value */
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*nump = num;
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return strp;
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}
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static ZCONST char *getsecs(strp, secsp)
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ZCONST char *strp;
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long * ZCONST secsp;
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{
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int num;
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/*
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** `HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like
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** "M10.4.6/26", which does not conform to Posix,
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** but which specifies the equivalent of
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** ``02:00 on the first Sunday on or after 23 Oct''.
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*/
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strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1);
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if (strp == NULL)
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return NULL;
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*secsp = num * (long) SECSPERHOUR;
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if (*strp == ':') {
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++strp;
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strp = getnum(strp, &num, 0, MINSPERHOUR - 1);
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if (strp == NULL)
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return NULL;
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*secsp += num * SECSPERMIN;
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if (*strp == ':') {
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++strp;
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/* `SECSPERMIN' allows for leap seconds. */
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strp = getnum(strp, &num, 0, SECSPERMIN);
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if (strp == NULL)
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return NULL;
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*secsp += num;
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}
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}
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return strp;
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}
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static ZCONST char *getoffset(strp, offsetp)
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ZCONST char *strp;
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long * ZCONST offsetp;
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{
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register int neg = 0;
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if (*strp == '-') {
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neg = 1;
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++strp;
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} else if (*strp == '+')
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++strp;
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strp = getsecs(strp, offsetp);
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if (strp == NULL)
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return NULL; /* illegal time */
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if (neg)
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*offsetp = -*offsetp;
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return strp;
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}
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static ZCONST char *getrule(strp, rulep)
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ZCONST char *strp;
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struct rule * ZCONST rulep;
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{
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if (*strp == 'J') {
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/*
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** Julian day.
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*/
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rulep->r_type = JULIAN_DAY;
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++strp;
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strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR);
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} else if (*strp == 'M') {
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/*
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** Month, week, day.
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*/
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rulep->r_type = MONTH_NTH_DAY_OF_WEEK;
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++strp;
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strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR);
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if (strp == NULL)
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return NULL;
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if (*strp++ != '.')
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return NULL;
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strp = getnum(strp, &rulep->r_week, 1, 5);
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if (strp == NULL)
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return NULL;
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if (*strp++ != '.')
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return NULL;
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strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1);
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} else if (isdigit(*strp)) {
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/*
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** Day of year.
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*/
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rulep->r_type = DAY_OF_YEAR;
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strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1);
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} else return NULL; /* invalid format */
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if (strp == NULL)
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return NULL;
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if (*strp == '/') {
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/*
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** Time specified.
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*/
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++strp;
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strp = getsecs(strp, &rulep->r_time);
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} else
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rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */
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return strp;
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}
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static int Parse_TZ(name, sp)
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ZCONST char *name;
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register struct state * ZCONST sp;
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{
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ZCONST char * stdname;
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ZCONST char * dstname;
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size_t stdlen;
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size_t dstlen;
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long stdoffset;
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long dstoffset;
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register char * cp;
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dstname = NULL;
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stdname = name;
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name = getzname(name);
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stdlen = name - stdname;
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if (stdlen < 3)
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return -1;
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if (*name == '\0')
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return -1;
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name = getoffset(name, &stdoffset);
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if (name == NULL)
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return -1;
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if (*name != '\0') {
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dstname = name;
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name = getzname(name);
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dstlen = name - dstname; /* length of DST zone name */
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if (dstlen < 3)
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return -1;
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if (*name != '\0' && *name != ',' && *name != ';') {
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name = getoffset(name, &dstoffset);
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if (name == NULL)
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return -1;
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} else
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dstoffset = stdoffset - SECSPERHOUR;
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if (*name == '\0')
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name = TZDEFRULESTRING;
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if (*name == ',' || *name == ';') {
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struct rule start;
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struct rule end;
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++name;
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if ((name = getrule(name, &start)) == NULL)
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return -1;
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if (*name++ != ',')
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return -1;
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if ((name = getrule(name, &end)) == NULL)
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return -1;
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if (*name != '\0')
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return -1;
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sp->typecnt = 2; /* standard time and DST */
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sp->ttis[0].tt_gmtoff = -stdoffset;
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sp->ttis[0].tt_isdst = 0;
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sp->ttis[0].tt_abbrind = 0;
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sp->ttis[1].tt_gmtoff = -dstoffset;
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sp->ttis[1].tt_isdst = 1;
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sp->ttis[1].tt_abbrind = stdlen + 1;
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generate_transitions(sp, &start, &end);
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}
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} else {
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dstlen = 0;
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sp->typecnt = 1; /* only standard time */
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sp->timecnt = 0;
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sp->ttis[0].tt_gmtoff = -stdoffset;
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sp->ttis[0].tt_isdst = 0;
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sp->ttis[0].tt_abbrind = 0;
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}
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sp->charcnt = stdlen + 1;
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if (dstlen != 0)
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sp->charcnt += dstlen + 1;
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if ((size_t) sp->charcnt > sizeof(sp->chars))
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return -1;
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cp = sp->chars;
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(void) strncpy(cp, stdname, stdlen);
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cp += stdlen;
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*cp++ = '\0';
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if (dstlen != 0) {
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(void) strncpy(cp, dstname, dstlen);
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*(cp + dstlen) = '\0';
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}
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return 0;
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}
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void tzset()
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{
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char *TZstring;
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int dstfirst;
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static char *old_TZstring = NULL;
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TZstring = getenv("TZ"); /* read TZ envvar */
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if (old_TZstring && TZstring && !strcmp(old_TZstring, TZstring))
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/* do not repeatedly parse an unchanged TZ specification */
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return;
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if ((TZstring && TZstring[0] && Parse_TZ(TZstring, &statism) == 0)
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|| IZTZ_GETLOCALETZINFO(&statism, generate_transitions)
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|| Parse_TZ(gmt, &statism) == 0) {
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daylight = statism.typecnt > 1;
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dstfirst = daylight && statism.ttis[0].tt_isdst && !statism.ttis[1].tt_isdst;
|
|
timezone = -statism.ttis[dstfirst].tt_gmtoff;
|
|
tzname[0] = statism.chars + statism.ttis[dstfirst].tt_abbrind;
|
|
tzname[1] = statism.chars + statism.ttis[!dstfirst].tt_abbrind;
|
|
real_timezone_is_set = TRUE;
|
|
if (TZstring) {
|
|
if (old_TZstring)
|
|
old_TZstring = realloc(old_TZstring, strlen(TZstring) + 1);
|
|
else
|
|
old_TZstring = malloc(strlen(TZstring) + 1);
|
|
if (old_TZstring)
|
|
strcpy(old_TZstring, TZstring);
|
|
}
|
|
} else {
|
|
timezone = 0; /* default is GMT0 which means no offsets */
|
|
daylight = 0; /* from local system time */
|
|
real_timezone_is_set = FALSE;
|
|
if (old_TZstring) {
|
|
free(old_TZstring);
|
|
old_TZstring = NULL;
|
|
}
|
|
}
|
|
#ifdef IZTZ_SETLOCALTZINFO
|
|
/* Some SAS/C library functions, e.g. stat(), call library */
|
|
/* __tzset() themselves. So envvar TZ *must* exist in order to */
|
|
/* to get the right offset from GMT. XXX TRY HARD to fix this! */
|
|
set_TZ(timezone, daylight);
|
|
#endif /* IZTZ_SETLOCALTZINFO */
|
|
}
|
|
|
|
/* XXX Does this also help SAS/C library work? */
|
|
void __tzset()
|
|
{
|
|
if (!real_timezone_is_set) tzset();
|
|
}
|
|
|
|
static struct tm _tmbuf;
|
|
|
|
struct tm *gmtime(when)
|
|
ZCONST time_t *when;
|
|
{
|
|
long days = *when / SECSPERDAY;
|
|
long secs = *when % SECSPERDAY;
|
|
int isleap;
|
|
|
|
memset(&_tmbuf, 0, sizeof(_tmbuf)); /* get any nonstandard fields */
|
|
_tmbuf.tm_wday = (days + EPOCH_WDAY) % 7;
|
|
_tmbuf.tm_year = EPOCH_YEAR - TM_YEAR_BASE;
|
|
isleap = leap(_tmbuf.tm_year + TM_YEAR_BASE);
|
|
while (days >= year_lengths[isleap]) {
|
|
days -= year_lengths[isleap];
|
|
_tmbuf.tm_year++;
|
|
isleap = leap(_tmbuf.tm_year + TM_YEAR_BASE);
|
|
}
|
|
_tmbuf.tm_mon = 0;
|
|
_tmbuf.tm_yday = days;
|
|
while (days >= mon_lengths[isleap][_tmbuf.tm_mon])
|
|
days -= mon_lengths[isleap][_tmbuf.tm_mon++];
|
|
_tmbuf.tm_mday = days + 1;
|
|
_tmbuf.tm_isdst = 0;
|
|
_tmbuf.tm_sec = secs % SECSPERMIN;
|
|
_tmbuf.tm_min = (secs / SECSPERMIN) % SECSPERMIN;
|
|
_tmbuf.tm_hour = secs / SECSPERHOUR;
|
|
return &_tmbuf;
|
|
}
|
|
|
|
struct tm *localtime(when)
|
|
ZCONST time_t *when;
|
|
{
|
|
time_t localwhen = *when;
|
|
int timetype;
|
|
struct tm *ret;
|
|
|
|
__tzset();
|
|
if (statism.timecnt == 0 || localwhen < statism.ats[0])
|
|
timetype = statism.ttis[0].tt_isdst && statism.typecnt > 1 &&
|
|
!statism.ttis[1].tt_isdst;
|
|
else {
|
|
for (timetype = 1; timetype < statism.timecnt; ++timetype)
|
|
if (localwhen < statism.ats[timetype])
|
|
break;
|
|
timetype = statism.types[timetype - 1];
|
|
}
|
|
localwhen += statism.ttis[timetype].tt_gmtoff;
|
|
ret = gmtime(&localwhen);
|
|
ret->tm_isdst = statism.ttis[timetype].tt_isdst;
|
|
return ret;
|
|
}
|
|
|
|
#ifdef NEED__ISINDST
|
|
int _isindst(tb)
|
|
struct tm *tb;
|
|
{
|
|
time_t localt; /* time_t equivalent of given tm struct */
|
|
time_t univt; /* assumed UTC value of given time */
|
|
long tzoffset_adj; /* timezone-adjustment `remainder' */
|
|
int bailout_cnt; /* counter of tries for tz correction */
|
|
int timetype;
|
|
|
|
__tzset();
|
|
|
|
/* when DST is unsupported in current timezone, DST is always off */
|
|
if (statism.typecnt <= 1) return FALSE;
|
|
|
|
localt = mkgmtime(tb);
|
|
if (localt == (time_t)-1)
|
|
/* specified time is out-of-range, default to FALSE */
|
|
return FALSE;
|
|
|
|
univt = localt - statism.ttis[0].tt_gmtoff;
|
|
bailout_cnt = 3;
|
|
do {
|
|
if (statism.timecnt == 0 || univt < statism.ats[0])
|
|
timetype = statism.ttis[0].tt_isdst && statism.typecnt > 1 &&
|
|
!statism.ttis[1].tt_isdst;
|
|
else {
|
|
for (timetype = 1; timetype < statism.timecnt; ++timetype)
|
|
if (univt < statism.ats[timetype])
|
|
break;
|
|
timetype = statism.types[timetype - 1];
|
|
}
|
|
if ((tzoffset_adj = localt - univt - statism.ttis[timetype].tt_gmtoff)
|
|
== 0L)
|
|
break;
|
|
univt += tzoffset_adj;
|
|
} while (--bailout_cnt > 0);
|
|
|
|
/* return TRUE when DST is active at given time */
|
|
return (statism.ttis[timetype].tt_isdst);
|
|
}
|
|
#endif /* NEED__ISINDST */
|
|
#endif /* !IZ_MKTIME_ONLY */
|
|
|
|
/* Return the equivalent in seconds past 12:00:00 a.m. Jan 1, 1970 GMT
|
|
of the local time and date in the exploded time structure `tm',
|
|
adjust out of range fields in `tm' and set `tm->tm_yday', `tm->tm_wday'.
|
|
If `tm->tm_isdst < 0' was passed to mktime(), the correct setting of
|
|
tm_isdst is determined and returned. Otherwise, mktime() assumes this
|
|
field as valid; its information is used when converting local time
|
|
to UTC.
|
|
Return -1 if time in `tm' cannot be represented as time_t value. */
|
|
|
|
time_t mktime(tm)
|
|
struct tm *tm;
|
|
{
|
|
struct tm *ltm; /* Local time. */
|
|
time_t loctime; /* The time_t value of local time. */
|
|
time_t then; /* The time to return. */
|
|
long tzoffset_adj; /* timezone-adjustment `remainder' */
|
|
int bailout_cnt; /* counter of tries for tz correction */
|
|
int save_isdst; /* Copy of the tm->isdst input value */
|
|
|
|
save_isdst = tm->tm_isdst;
|
|
loctime = mkgmtime(tm);
|
|
if (loctime == -1) {
|
|
tm->tm_isdst = save_isdst;
|
|
return (time_t)-1;
|
|
}
|
|
|
|
/* Correct for the timezone and any daylight savings time.
|
|
The correction is verified and repeated when not correct, to
|
|
take into account the rare case that a change to or from daylight
|
|
savings time occurs between when it is the time in `tm' locally
|
|
and when it is that time in Greenwich. After the second correction,
|
|
the "timezone & daylight" offset should be correct in all cases. To
|
|
be sure, we allow a third try, but then the loop is stopped. */
|
|
bailout_cnt = 3;
|
|
then = loctime;
|
|
do {
|
|
ltm = localtime(&then);
|
|
if (ltm == (struct tm *)NULL ||
|
|
(tzoffset_adj = loctime - mkgmtime(ltm)) == 0L)
|
|
break;
|
|
then += tzoffset_adj;
|
|
} while (--bailout_cnt > 0);
|
|
|
|
if (ltm == (struct tm *)NULL || tzoffset_adj != 0L) {
|
|
/* Signal failure if timezone adjustment did not converge. */
|
|
tm->tm_isdst = save_isdst;
|
|
return (time_t)-1;
|
|
}
|
|
|
|
if (save_isdst >= 0) {
|
|
if (ltm->tm_isdst && !save_isdst)
|
|
{
|
|
if (then + 3600 < then)
|
|
then = (time_t)-1;
|
|
else
|
|
then += 3600;
|
|
}
|
|
else if (!ltm->tm_isdst && save_isdst)
|
|
{
|
|
if (then - 3600 > then)
|
|
then = (time_t)-1;
|
|
else
|
|
then -= 3600;
|
|
}
|
|
ltm->tm_isdst = save_isdst;
|
|
}
|
|
|
|
if (tm != ltm) /* `tm' may already point to localtime's internal storage */
|
|
*tm = *ltm;
|
|
|
|
return then;
|
|
}
|
|
|
|
|
|
#ifndef NO_TIME_T_MAX
|
|
/* Provide default values for the upper limit of the time_t range.
|
|
These are the result of the decomposition into a `struct tm' for
|
|
the time value 0xFFFFFFFEL ( = (time_t)-2 ).
|
|
Note: `(time_t)-1' is reserved for "invalid time"! */
|
|
# ifndef TM_YEAR_MAX
|
|
# define TM_YEAR_MAX 2106
|
|
# endif
|
|
# ifndef TM_MON_MAX
|
|
# define TM_MON_MAX 1 /* February */
|
|
# endif
|
|
# ifndef TM_MDAY_MAX
|
|
# define TM_MDAY_MAX 7
|
|
# endif
|
|
# ifndef TM_HOUR_MAX
|
|
# define TM_HOUR_MAX 6
|
|
# endif
|
|
# ifndef TM_MIN_MAX
|
|
# define TM_MIN_MAX 28
|
|
# endif
|
|
# ifndef TM_SEC_MAX
|
|
# define TM_SEC_MAX 14
|
|
# endif
|
|
#endif /* NO_TIME_T_MAX */
|
|
|
|
/* Adjusts out-of-range values for `tm' field `tm_member'. */
|
|
#define ADJUST_TM(tm_member, tm_carry, modulus) \
|
|
if ((tm_member) < 0) { \
|
|
tm_carry -= (1 - ((tm_member)+1) / (modulus)); \
|
|
tm_member = (modulus-1) + (((tm_member)+1) % (modulus)); \
|
|
} else if ((tm_member) >= (modulus)) { \
|
|
tm_carry += (tm_member) / (modulus); \
|
|
tm_member = (tm_member) % (modulus); \
|
|
}
|
|
|
|
/* Return the equivalent in seconds past 12:00:00 a.m. Jan 1, 1970 GMT
|
|
of the Greenwich Mean time and date in the exploded time structure `tm'.
|
|
This function does always put back normalized values into the `tm' struct,
|
|
parameter, including the calculated numbers for `tm->tm_yday',
|
|
`tm->tm_wday', and `tm->tm_isdst'.
|
|
Returns -1 if the time in the `tm' parameter cannot be represented
|
|
as valid `time_t' number. */
|
|
|
|
time_t mkgmtime(tm)
|
|
struct tm *tm;
|
|
{
|
|
int years, months, days, hours, minutes, seconds;
|
|
|
|
years = tm->tm_year + TM_YEAR_BASE; /* year - 1900 -> year */
|
|
months = tm->tm_mon; /* 0..11 */
|
|
days = tm->tm_mday - 1; /* 1..31 -> 0..30 */
|
|
hours = tm->tm_hour; /* 0..23 */
|
|
minutes = tm->tm_min; /* 0..59 */
|
|
seconds = tm->tm_sec; /* 0..61 in ANSI C. */
|
|
|
|
ADJUST_TM(seconds, minutes, 60)
|
|
ADJUST_TM(minutes, hours, 60)
|
|
ADJUST_TM(hours, days, 24)
|
|
ADJUST_TM(months, years, 12)
|
|
if (days < 0)
|
|
do {
|
|
if (--months < 0) {
|
|
--years;
|
|
months = 11;
|
|
}
|
|
days += monthlen(months, years);
|
|
} while (days < 0);
|
|
else
|
|
while (days >= monthlen(months, years)) {
|
|
days -= monthlen(months, years);
|
|
if (++months >= 12) {
|
|
++years;
|
|
months = 0;
|
|
}
|
|
}
|
|
|
|
/* Restore adjusted values in tm structure */
|
|
tm->tm_year = years - TM_YEAR_BASE;
|
|
tm->tm_mon = months;
|
|
tm->tm_mday = days + 1;
|
|
tm->tm_hour = hours;
|
|
tm->tm_min = minutes;
|
|
tm->tm_sec = seconds;
|
|
|
|
/* Set `days' to the number of days into the year. */
|
|
days += YDAYS(months, years);
|
|
tm->tm_yday = days;
|
|
|
|
/* Now calculate `days' to the number of days since Jan 1, 1970. */
|
|
days = (unsigned)days + 365 * (unsigned)(years - EPOCH_YEAR) +
|
|
(unsigned)(nleap (years));
|
|
tm->tm_wday = ((unsigned)days + EPOCH_WDAY) % 7;
|
|
tm->tm_isdst = 0;
|
|
|
|
if (years < EPOCH_YEAR)
|
|
return (time_t)-1;
|
|
|
|
#if (defined(TM_YEAR_MAX) && defined(TM_MON_MAX) && defined(TM_MDAY_MAX))
|
|
#if (defined(TM_HOUR_MAX) && defined(TM_MIN_MAX) && defined(TM_SEC_MAX))
|
|
if (years > TM_YEAR_MAX ||
|
|
(years == TM_YEAR_MAX &&
|
|
(tm->tm_yday > (YDAYS(TM_MON_MAX, TM_YEAR_MAX) + (TM_MDAY_MAX - 1)) ||
|
|
(tm->tm_yday == (YDAYS(TM_MON_MAX, TM_YEAR_MAX) + (TM_MDAY_MAX - 1)) &&
|
|
(hours > TM_HOUR_MAX ||
|
|
(hours == TM_HOUR_MAX &&
|
|
(minutes > TM_MIN_MAX ||
|
|
(minutes == TM_MIN_MAX && seconds > TM_SEC_MAX) )))))))
|
|
return (time_t)-1;
|
|
#endif
|
|
#endif
|
|
|
|
return (time_t)(SECSPERDAY * (unsigned long)(unsigned)days +
|
|
SECSPERHOUR * (unsigned long)hours +
|
|
(unsigned long)(SECSPERMIN * minutes + seconds));
|
|
}
|
|
|
|
#endif /* __timezone_c */
|