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1294 lines
38 KiB
1294 lines
38 KiB
/***
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*tzset.c - set timezone information and see if we're in daylight time
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*
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* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* defines _tzset() - set timezone and daylight saving time vars
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*
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*Revision History:
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* 03-??-84 RLB initial version
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* 03-26-86 TC added minus capability to time difference w.r.t GMT
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* 03-27-86 TC fixed daylight davings time calculation, off by a day
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* error
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* 12-03-86 SKS daylight savings time is different starting april 1987
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* Fixed off-by-1 errors when either Apr 30 or Oct 31 is
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* Sat. Simplified leap year check: this works for
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* 1970-2099 only!
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* 11-19-87 SKS Add __tzset() which calls tzset only the first time
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* Made _isindst() a near procedure
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* 11-25-87 WAJ Added calls to _lock and _unlock
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* 12-11-87 JCR Added "_LOAD_DS" to declaration
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* 01-27-88 SKS Made _isindst() and _dtoxtime() are no longer near (for
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* QC)
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* 05-24-88 PHG Merged DLL and normal versions
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* 03-20-90 GJF Made calling type _CALLTYPE1, added #include
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* <cruntime.h>, removed #include <register.h>, removed
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* some leftover 16-bit support and fixed the copyright.
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* Also, cleaned up the formatting a bit.
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* 03-23-90 GJF Made static functions _CALLTYPE4.
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* 07-30-90 SBM Added void to empty function arg lists to create
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* prototypes
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* 10-04-90 GJF New-style function declarators.
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* 01-21-91 GJF ANSI naming.
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* 08-10-92 PBS Posix Support (TZ stuff).
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* 03-30-93 GJF Ported C8-16 version to Win32.
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* 04-06-93 SKS Replace _CRTAPI* with __cdecl
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* 04-07-93 SKS Replace strdup() with ANSI conformant _strdup()
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* 06-28-93 GJF Limited support for system's notion of time zone
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* in Windows NT.
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* 07-15-93 GJF Resurrected __tzset().
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* 04-22-94 GJF Made definitions of lastTZ and first_time conditonal
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* on DLL_FOR_WIN32S.
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* 01-10-95 CFW Debug CRT allocs.
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* 02-13-95 GJF Appended Mac version of source file (somewhat cleaned
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* up), with appropriate #ifdef-s.
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* 04-07-95 JCF Change gmtFlags with u. Due to Changes in macos\osutils.h
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* 06-28-95 CFW Mac: when TZ not set, _tzname[0,1]="" not "???";
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* 08-30-95 GJF Complete support for Win32's notion of time zones.
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* 11-08-95 GJF Fixed isindst() to release lock.
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* 11-15-95 GJF Ensure dststart, dstend get recomputed after _tzset.
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* 01-18-96 GJF Ensure _tzname[] strings are null-terminated.
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* 03-22-96 GJF Zero out _dstbias if there is no DST. This works
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* around a bug in NT's GetTimeZoneInformation API.
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* 07-25-96 RDK Removed PMAC init ptr here to clock.c.
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* 10-11-96 GJF Return value of TIME_ZONE_ID_UNKNOWN from
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* GetTimeZoneInformation does NOT mean there is no time
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* zone info (it may simply mean there is no DST).
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* 08-28-97 GJF Fixed underflow adjustment in cvtdate. Also, deleted
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* some old Win32S support and detab-ed.
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* 01-28-98 GJF Use WideCharToMultiByte API instead of mbstowcs so
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* that the host's default ANSI codepage is used when we
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* are in the C locale.
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* 02-09-98 GJF Changes for Win64: removing unnecessary typing of vars
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* and constants as long.
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* 05-11-98 GJF Use more general leap determination to support time
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* values past 2099.
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* 05-11-98 GJF Merged in crt.ia64 and crt.ia64 versions.
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* 08-27-98 GJF Copy __lc_codepage, a global, to a local var for
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* multithread safety.
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* 09-25-98 GJF Minor bug in transition day calculation.
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* 04-28-99 GJF Changed dwFlags arg value to 0 in WideCharToMultiByte
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* calls to avoid problems with codepage 1258 on NT 5.0.
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* 05-17-99 PML Remove all Macintosh support.
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* 06-08-99 GJF Fixed handling of empty TZ environment variable.
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* 09-28-99 PML Fixed double free of lastTZ (ntbug#390281)
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <ctype.h>
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#include <ctime.h>
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#include <time.h>
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#include <stdlib.h>
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#include <internal.h>
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#ifdef _POSIX_
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#include <limits.h>
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#else
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#include <mtdll.h>
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#include <windows.h>
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#endif
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#include <setlocal.h>
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#include <string.h>
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#include <dbgint.h>
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#ifndef _POSIX_
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/*
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* Number of milliseconds in one day
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*/
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#define DAY_MILLISEC (24 * 60 * 60 * 1000)
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/*
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* Pointer to a saved copy of the TZ value obtained in the previous call
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* to tzset() set (if any).
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*/
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static char * lastTZ = NULL;
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/*
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* Flag indicating that time zone information came from GetTimeZoneInformation
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* API call.
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*/
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static int tzapiused;
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static TIME_ZONE_INFORMATION tzinfo;
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/*
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* Structure used to represent DST transition date/times.
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*/
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typedef struct {
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int yr; /* year of interest */
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int yd; /* day of year */
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int ms; /* milli-seconds in the day */
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} transitiondate;
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/*
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* DST start and end structs.
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*/
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static transitiondate dststart = { -1, 0, 0 };
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static transitiondate dstend = { -1, 0, 0 };
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static int __cdecl _isindst_lk(struct tm *);
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#endif
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/***
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*void tzset() - sets timezone information and calc if in daylight time
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*
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*Purpose:
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* Sets the timezone information from the TZ environment variable
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* and then sets _timezone, _daylight, and _tzname. If we're in daylight
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* time is automatically calculated.
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*
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*Entry:
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* None, reads TZ environment variable.
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*
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*Exit:
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* sets _daylight, _timezone, and _tzname global vars, no return value
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*
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*Exceptions:
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*
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*******************************************************************************/
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#ifndef _POSIX_
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#ifdef _MT
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static void __cdecl _tzset_lk(void);
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#else
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#define _tzset_lk _tzset
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#endif
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void __cdecl __tzset(void)
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{
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static int first_time = 0;
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if ( !first_time ) {
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_mlock( _TIME_LOCK );
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if ( !first_time ) {
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_tzset_lk();
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first_time++;
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}
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_munlock(_TIME_LOCK );
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}
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}
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#ifdef _MT /* multi-thread; define both tzset and _tzset_lk */
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void __cdecl _tzset (
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void
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)
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{
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_mlock( _TIME_LOCK );
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_tzset_lk();
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_munlock( _TIME_LOCK );
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}
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static void __cdecl _tzset_lk (
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#else /* non multi-thread; only define tzset */
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void __cdecl _tzset (
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#endif /* rejoin common code */
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void
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)
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{
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char *TZ;
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int defused;
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int negdiff = 0;
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unsigned int lc_cp;
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_mlock(_ENV_LOCK);
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/*
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* Copy codepage to local (only really necessary for multithread case)
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*/
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lc_cp = __lc_codepage;
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/*
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* Clear the flag indicated whether GetTimeZoneInformation was used.
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*/
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tzapiused = 0;
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/*
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* Set year fields of dststart and dstend structures to -1 to ensure
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* they are recomputed as after this
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*/
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dststart.yr = dstend.yr = -1;
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/*
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* Fetch the value of the TZ environment variable.
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*/
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if ( ((TZ = _getenv_lk("TZ")) == NULL) || (*TZ =='\0') ) {
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/*
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* There is no TZ environment variable, try to use the time zone
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* information from the system.
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*/
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/*
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* If there is a lastTZ, discard it
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*/
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if ( lastTZ != NULL ) {
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_free_crt(lastTZ);
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lastTZ = NULL;
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}
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_munlock(_ENV_LOCK);
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if ( GetTimeZoneInformation( &tzinfo ) != 0xFFFFFFFF ) {
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/*
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* Note that the API was used.
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*/
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tzapiused = 1;
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/*
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* Derive _timezone value from Bias and StandardBias fields.
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*/
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_timezone = tzinfo.Bias * 60;
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if ( tzinfo.StandardDate.wMonth != 0 )
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_timezone += (tzinfo.StandardBias * 60);
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/*
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* Check to see if there is a daylight time bias. Since the
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* StandardBias has been added into _timezone, it must be
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* compensated for in the value computed for _dstbias.
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*/
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if ( (tzinfo.DaylightDate.wMonth != 0) &&
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(tzinfo.DaylightBias != 0) )
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{
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_daylight = 1;
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_dstbias = (tzinfo.DaylightBias - tzinfo.StandardBias) *
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60;
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}
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else {
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_daylight = 0;
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/*
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* Set daylight bias to 0 because GetTimeZoneInformation
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* may return TIME_ZONE_ID_DAYLIGHT even though there is
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* no DST (in NT 3.51, just turn off the automatic DST
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* adjust in the control panel)!
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*/
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_dstbias = 0;
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}
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/*
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* Try to grab the name strings for both the time zone and the
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* daylight zone. Note the wide character strings in tzinfo
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* must be converted to multibyte characters strings. The
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* locale codepage, __lc_codepage, is used for this. Note that
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* if setlocale() with LC_ALL or LC_CTYPE has not been called,
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* then __lc_codepage will be 0 (_CLOCALECP), which is CP_ACP
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* (which means use the host's default ANSI codepage).
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*/
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if ( (WideCharToMultiByte( lc_cp,
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0,
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tzinfo.StandardName,
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-1,
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_tzname[0],
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63,
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NULL,
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&defused ) != 0) &&
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(!defused) )
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_tzname[0][63] = '\0';
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else
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_tzname[0][0] = '\0';
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if ( (WideCharToMultiByte( lc_cp,
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0,
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tzinfo.DaylightName,
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-1,
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_tzname[1],
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63,
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NULL,
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&defused ) != 0) &&
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(!defused) )
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_tzname[1][63] = '\0';
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else
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_tzname[1][0] = '\0';
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}
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/*
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* Time zone information is unavailable, just return.
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*/
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return;
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}
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if ( (lastTZ != NULL) && (strcmp(TZ, lastTZ) == 0) )
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{
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/*
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* TZ is unchanged from a earlier call (to this function). Just
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* return.
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*/
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_munlock(_ENV_LOCK);
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return;
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}
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/*
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* Update lastTZ
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*/
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if ( lastTZ != NULL )
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_free_crt(lastTZ);
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if ((lastTZ = _malloc_crt(strlen(TZ)+1)) == NULL)
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{
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_munlock(_ENV_LOCK);
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return;
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}
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strcpy(lastTZ, TZ);
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_munlock(_ENV_LOCK);
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/*
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* Process TZ value and update _tzname, _timezone and _daylight.
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*/
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strncpy(_tzname[0], TZ, 3);
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_tzname[0][3] = '\0';
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/*
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* time difference is of the form:
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*
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* [+|-]hh[:mm[:ss]]
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*
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* check minus sign first.
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*/
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if ( *(TZ += 3) == '-' ) {
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negdiff++;
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TZ++;
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}
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/*
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* process, then skip over, the hours
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*/
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_timezone = atol(TZ) * 3600;
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while ( (*TZ == '+') || ((*TZ >= '0') && (*TZ <= '9')) ) TZ++;
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/*
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* check if minutes were specified
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*/
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if ( *TZ == ':' ) {
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/*
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* process, then skip over, the minutes
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*/
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_timezone += atol(++TZ) * 60;
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while ( (*TZ >= '0') && (*TZ <= '9') ) TZ++;
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/*
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* check if seconds were specified
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*/
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if ( *TZ == ':' ) {
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/*
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* process, then skip over, the seconds
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*/
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_timezone += atol(++TZ);
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while ( (*TZ >= '0') && (*TZ <= '9') ) TZ++;
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}
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}
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if ( negdiff )
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_timezone = -_timezone;
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/*
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* finally, check for a DST zone suffix
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*/
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if ( _daylight = *TZ ) {
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strncpy(_tzname[1], TZ, 3);
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_tzname[1][3] = '\0';
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}
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else
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*_tzname[1] = '\0';
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}
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/***
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*static void cvtdate( trantype, datetype, year, month, week, dayofweek,
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* date, hour, min, second, millisec ) - convert
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* transition date format
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*
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*Purpose:
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* Convert the format of a transition date specification to a value of
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* a transitiondate structure.
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*
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*Entry:
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* int trantype - 1, if it is the start of DST
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* 0, if is the end of DST (in which case the date is
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* is a DST date)
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* int datetype - 1, if a day-in-month format is specified.
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* 0, if an absolute date is specified.
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* int year - year for which the date is being converted (70 ==
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* 1970)
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* int month - month (0 == January)
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* int week - week of month, if datetype == 1 (note that 5== last
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* week of month),
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* 0, otherwise.
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* int dayofweek - day of week (0 == Sunday), if datetype == 1.
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* 0, otherwise.
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* int date - date of month (1 - 31)
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* int hour - hours (0 - 23)
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* int min - minutes (0 - 59)
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* int sec - seconds (0 - 59)
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* int msec - milliseconds (0 - 999)
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*
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*Exit:
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* dststart or dstend is filled in with the converted date.
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*
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*******************************************************************************/
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static void __cdecl cvtdate (
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int trantype,
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int datetype,
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int year,
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int month,
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int week,
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int dayofweek,
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int date,
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int hour,
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int min,
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int sec,
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int msec
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)
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{
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int yearday;
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int monthdow;
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|
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if ( datetype == 1 ) {
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/*
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* Transition day specified in day-in-month format.
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*/
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|
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/*
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* Figure the year-day of the start of the month.
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*/
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yearday = 1 + (_IS_LEAP_YEAR(year) ? _lpdays[month - 1] :
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_days[month - 1]);
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|
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/*
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* Figure the day of the week of the start of the month.
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*/
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monthdow = (yearday + ((year - 70) * 365) +
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_ELAPSED_LEAP_YEARS(year) + _BASE_DOW) % 7;
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|
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/*
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* Figure the year-day of the transition date
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*/
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if ( monthdow <= dayofweek )
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yearday += (dayofweek - monthdow) + (week - 1) * 7;
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else
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yearday += (dayofweek - monthdow) + week * 7;
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|
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/*
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* May have to adjust the calculation above if week == 5 (meaning
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* the last instance of the day in the month). Check if year falls
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* beyond after month and adjust accordingly.
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*/
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|
if ( (week == 5) &&
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|
(yearday > (_IS_LEAP_YEAR(year) ? _lpdays[month] :
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_days[month])) )
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{
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yearday -= 7;
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}
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}
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else {
|
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/*
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* Transition day specified as an absolute day
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*/
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yearday = _IS_LEAP_YEAR(year) ? _lpdays[month - 1] :
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_days[month - 1];
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yearday += date;
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}
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|
|
if ( trantype == 1 ) {
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/*
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* Converted date was for the start of DST
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*/
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dststart.yd = yearday;
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dststart.ms = msec + (1000 * (sec + 60 * (min + 60 * hour)));
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|
/*
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|
* Set year field of dststart so that unnecessary calls to
|
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* cvtdate() may be avoided.
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|
*/
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|
dststart.yr = year;
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}
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else {
|
|
/*
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|
* Converted date was for the end of DST
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*/
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dstend.yd = yearday;
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dstend.ms = msec + (1000 * (sec + 60 * (min + 60 * hour)));
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|
/*
|
|
* The converted date is still a DST date. Must convert to a
|
|
* standard (local) date while being careful the millisecond field
|
|
* does not overflow or underflow.
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|
*/
|
|
if ( (dstend.ms += (_dstbias * 1000)) < 0 ) {
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dstend.ms += DAY_MILLISEC;
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dstend.yd--;
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}
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else if ( dstend.ms >= DAY_MILLISEC ) {
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dstend.ms -= DAY_MILLISEC;
|
|
dstend.yd++;
|
|
}
|
|
|
|
/*
|
|
* Set year field of dstend so that unnecessary calls to cvtdate()
|
|
* may be avoided.
|
|
*/
|
|
dstend.yr = year;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/***
|
|
*int _isindst(tb) - determine if broken-down time falls in DST
|
|
*
|
|
*Purpose:
|
|
* Determine if the given broken-down time falls within daylight saving
|
|
* time (DST). The DST rules are either obtained from Win32 (tzapiused !=
|
|
* TRUE) or assumed to be USA rules, post 1986.
|
|
*
|
|
* If the DST rules are obtained from Win32's GetTimeZoneInformation API,
|
|
* the transition dates to/from DST can be specified in either of two
|
|
* formats. First, a day-in-month format, similar to the way USA rules
|
|
* are specified, can be used. The transition date is given as the n-th
|
|
* occurence of a specified day of the week in a specified month. Second,
|
|
* an absolute date can be specified. The two cases are distinguished by
|
|
* the value of wYear field in the SYSTEMTIME structure (0 denotes a
|
|
* day-in-month format).
|
|
*
|
|
* USA rules for DST are that a time is in DST iff it is on or after
|
|
* 02:00 on the first Sunday in April, and before 01:00 on the last
|
|
* Sunday in October.
|
|
*
|
|
*Entry:
|
|
* struct tm *tb - structure holding broken-down time value
|
|
*
|
|
*Exit:
|
|
* 1, if time represented is in DST
|
|
* 0, otherwise
|
|
*
|
|
*******************************************************************************/
|
|
|
|
int __cdecl _isindst (
|
|
struct tm *tb
|
|
)
|
|
#ifdef _MT
|
|
{
|
|
int retval;
|
|
|
|
_mlock( _TIME_LOCK );
|
|
retval = _isindst_lk( tb );
|
|
_munlock( _TIME_LOCK );
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int __cdecl _isindst_lk (
|
|
struct tm *tb
|
|
)
|
|
#endif /* _MT */
|
|
{
|
|
long ms;
|
|
|
|
if ( _daylight == 0 )
|
|
return 0;
|
|
|
|
/*
|
|
* Compute (recompute) the transition dates for daylight saving time
|
|
* if necessary.The yr (year) fields of dststart and dstend is
|
|
* compared to the year of interest to determine necessity.
|
|
*/
|
|
if ( (tb->tm_year != dststart.yr) || (tb->tm_year != dstend.yr) ) {
|
|
if ( tzapiused ) {
|
|
/*
|
|
* Convert the start of daylight saving time to dststart.
|
|
*/
|
|
if ( tzinfo.DaylightDate.wYear == 0 )
|
|
cvtdate( 1,
|
|
1, /* day-in-month format */
|
|
tb->tm_year,
|
|
tzinfo.DaylightDate.wMonth,
|
|
tzinfo.DaylightDate.wDay,
|
|
tzinfo.DaylightDate.wDayOfWeek,
|
|
0,
|
|
tzinfo.DaylightDate.wHour,
|
|
tzinfo.DaylightDate.wMinute,
|
|
tzinfo.DaylightDate.wSecond,
|
|
tzinfo.DaylightDate.wMilliseconds );
|
|
else
|
|
cvtdate( 1,
|
|
0, /* absolute date */
|
|
tb->tm_year,
|
|
tzinfo.DaylightDate.wMonth,
|
|
0,
|
|
0,
|
|
tzinfo.DaylightDate.wDay,
|
|
tzinfo.DaylightDate.wHour,
|
|
tzinfo.DaylightDate.wMinute,
|
|
tzinfo.DaylightDate.wSecond,
|
|
tzinfo.DaylightDate.wMilliseconds );
|
|
/*
|
|
* Convert start of standard time to dstend.
|
|
*/
|
|
if ( tzinfo.StandardDate.wYear == 0 )
|
|
cvtdate( 0,
|
|
1, /* day-in-month format */
|
|
tb->tm_year,
|
|
tzinfo.StandardDate.wMonth,
|
|
tzinfo.StandardDate.wDay,
|
|
tzinfo.StandardDate.wDayOfWeek,
|
|
0,
|
|
tzinfo.StandardDate.wHour,
|
|
tzinfo.StandardDate.wMinute,
|
|
tzinfo.StandardDate.wSecond,
|
|
tzinfo.StandardDate.wMilliseconds );
|
|
else
|
|
cvtdate( 0,
|
|
0, /* absolute date */
|
|
tb->tm_year,
|
|
tzinfo.StandardDate.wMonth,
|
|
0,
|
|
0,
|
|
tzinfo.StandardDate.wDay,
|
|
tzinfo.StandardDate.wHour,
|
|
tzinfo.StandardDate.wMinute,
|
|
tzinfo.StandardDate.wSecond,
|
|
tzinfo.StandardDate.wMilliseconds );
|
|
|
|
}
|
|
else {
|
|
/*
|
|
* GetTimeZoneInformation API was NOT used, or failed. USA
|
|
* daylight saving time rules are assumed.
|
|
*/
|
|
cvtdate( 1,
|
|
1,
|
|
tb->tm_year,
|
|
4, /* April */
|
|
1, /* first... */
|
|
0, /* ...Sunday */
|
|
0,
|
|
2, /* 02:00 (2 AM) */
|
|
0,
|
|
0,
|
|
0 );
|
|
|
|
cvtdate( 0,
|
|
1,
|
|
tb->tm_year,
|
|
10, /* October */
|
|
5, /* last... */
|
|
0, /* ...Sunday */
|
|
0,
|
|
2, /* 02:00 (2 AM) */
|
|
0,
|
|
0,
|
|
0 );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Handle simple cases first.
|
|
*/
|
|
if ( dststart.yd < dstend.yd ) {
|
|
/*
|
|
* Northern hemisphere ordering
|
|
*/
|
|
if ( (tb->tm_yday < dststart.yd) || (tb->tm_yday > dstend.yd) )
|
|
return 0;
|
|
if ( (tb->tm_yday > dststart.yd) && (tb->tm_yday < dstend.yd) )
|
|
return 1;
|
|
}
|
|
else {
|
|
/*
|
|
* Southern hemisphere ordering
|
|
*/
|
|
if ( (tb->tm_yday < dstend.yd) || (tb->tm_yday > dststart.yd) )
|
|
return 1;
|
|
if ( (tb->tm_yday > dstend.yd) && (tb->tm_yday < dststart.yd) )
|
|
return 0;
|
|
}
|
|
|
|
ms = 1000 * (tb->tm_sec + 60 * tb->tm_min + 3600 * tb->tm_hour);
|
|
|
|
if ( tb->tm_yday == dststart.yd ) {
|
|
if ( ms >= dststart.ms )
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
else {
|
|
/*
|
|
* tb->tm_yday == dstend.yd
|
|
*/
|
|
if ( ms < dstend.ms )
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
}
|
|
|
|
#else /* _POSIX_ */
|
|
|
|
/*
|
|
* The following is an implementation of the TZ grammar specified in the
|
|
* document:
|
|
*
|
|
* 8.1.1 Extension to Time Functions
|
|
* IEEE Std 1003.1 - 1990
|
|
* Page 152 - 153
|
|
*
|
|
* The TZ grammar looks like:
|
|
*
|
|
* stdoffset[dst[offset][,start[/time],end[/time]]]
|
|
*
|
|
* Variables used in code:
|
|
*
|
|
* tzname[0] ==> std
|
|
* _timezone ==> offset(the one after 'std')
|
|
* tzname[1] ==> dst
|
|
* _dstoffset ==> offset(the one after 'dst')
|
|
* _startdate ==> start
|
|
* _starttime ==> time(the one after 'start')
|
|
* _enddate ==> end
|
|
* _endtime ==> time(the one after 'end')
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* Refer to the document for the detailed description of fields of _DSTDATE.
|
|
* Two of Jn, n, and Mm are -1, indicating the one(not -1) is a vaild value.
|
|
*/
|
|
|
|
typedef struct _DSTDATE {
|
|
int Jn; /* -1 or [1, 365](year day and leap day shall not be counted) */
|
|
int n; /* -1 or [0, 365](year day and leap day shall be counted) */
|
|
int Mm; /* -1 or [1, 12](month) */
|
|
int Mn; /* [1, 5] if Mm != -1 (week) */
|
|
int Md; /* [0, 6] if Mm != -1 (weekday, Sunday == 0) */
|
|
} DSTDATE, *PDSTDATE;
|
|
|
|
#define SEC_PER_HOUR (60 * 60)
|
|
#define SEC_PER_DAY (SEC_PER_HOUR * 24)
|
|
|
|
|
|
/*
|
|
* The default TZ in tzset() should look like:
|
|
*
|
|
* TZ = "PST8PDT,M4.1.0/2:00,M10.5.0/2:00";
|
|
*/
|
|
|
|
/* Day light saving start/end date and default vaules */
|
|
static DSTDATE _startdate = { -1, -1, 4, 1, 0};
|
|
static DSTDATE _enddate = {-1, -1, 10, 5, 0};
|
|
|
|
|
|
/* Seconds since midnight on _startdate/_enddate with default values.
|
|
* _endtime is 1am instead of 2am because the DST end time is 2am
|
|
* local time, which by default is 1am standard time.
|
|
*/
|
|
long _starttime = 7200L, _endtime = 7200L;
|
|
|
|
/*
|
|
* If we are only interested in years between 1901 and 2099, we could use this:
|
|
*
|
|
* #define IS_LEAP_YEAR(y) (y % 4 == 0)
|
|
*/
|
|
|
|
#define IS_LEAP_YEAR(y) ((y % 4 == 0 && y % 100 != 0) || y % 400 == 0)
|
|
|
|
|
|
/*
|
|
* ParsePosixStdOrDst - parse the std or dst element in TZ.
|
|
*
|
|
* ENTRY pch - beginning of the substring in TZ.
|
|
*
|
|
* RETURN pointer to one position after the std or dst element parsed,
|
|
* or NULL if failed.
|
|
*/
|
|
|
|
|
|
static char * __cdecl
|
|
ParsePosixStdOrDst(
|
|
REG1 char *pch
|
|
)
|
|
{
|
|
#define UNWANTED(x) (isdigit(x) || x=='\0' || x==',' || x=='-' || x=='+')
|
|
int i;
|
|
|
|
/*
|
|
* Check against the rule.
|
|
*/
|
|
|
|
if(*pch == ':' || UNWANTED(*pch)) {
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Get a valid std or dst(i.e. 3 <= lenth_of(std | dst) <= TZNAME_MAX).
|
|
*/
|
|
|
|
for(i=1, ++pch; (i < TZNAME_MAX) && !UNWANTED(*pch); i++, pch++) {
|
|
;
|
|
}
|
|
|
|
/*
|
|
* pch now point to 1 position after the valid std or dst.
|
|
*/
|
|
|
|
return (i >= 3) ? pch : NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* ParsePosixOffset - parse the offset element in TZ. The format of time is:
|
|
*
|
|
* [- | +]hh[:mm[:ss]]
|
|
*
|
|
* ENTRY pch - beginning of the substring in TZ.
|
|
*
|
|
* ptime - pointer to a variable(_timezone or _dstoffset) storing the
|
|
* time(in seconds) parsed.
|
|
*
|
|
* RETURN pointer to one position after the end of the offset element parsed.
|
|
*/
|
|
|
|
|
|
static char * __cdecl
|
|
ParsePosixOffset(
|
|
REG1 char *pch,
|
|
REG2 long *poffset
|
|
)
|
|
{
|
|
int fNegative;
|
|
long offset;
|
|
|
|
if((fNegative = (*pch == '-')) || *pch == '+') {
|
|
pch++;
|
|
}
|
|
|
|
offset = atol(pch)*3600L; /* hh */
|
|
|
|
while(*pch && isdigit(*pch)) {
|
|
pch++;
|
|
}
|
|
|
|
if(*pch == ':') {
|
|
offset += atol(++pch)*60L; /* mm */
|
|
while(*pch && isdigit(*pch)) {
|
|
pch++;
|
|
}
|
|
|
|
if(*pch == ':') {
|
|
offset += atol(++pch); /* ss */
|
|
while(*pch && isdigit(*pch)) {
|
|
pch++;
|
|
}
|
|
}
|
|
}
|
|
|
|
*poffset = fNegative ? -offset : offset;
|
|
|
|
return pch;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* ParsePosixDate - parse the date element in TZ. The format of date is one
|
|
* of following:
|
|
*
|
|
* Jn, n, and Mm.n.d
|
|
*
|
|
* ENTRY pch - beginning of the substring in TZ.
|
|
*
|
|
* pDstDate - pointer to _startdate or _enddate storing the result.
|
|
*
|
|
* RETURN pointer to one position after the end of the date element parsed,
|
|
* or NULL if failed.
|
|
*/
|
|
|
|
static char * __cdecl
|
|
ParsePosixDate(
|
|
REG1 char *pch,
|
|
REG2 PDSTDATE pDstDate
|
|
)
|
|
{
|
|
pDstDate->Jn = -1;
|
|
pDstDate->n = -1;
|
|
pDstDate->Mn = -1;
|
|
|
|
/*
|
|
* Two out of the three -1's will remain.
|
|
*/
|
|
|
|
if(*pch == 'J') { /* Jn */
|
|
pDstDate->Jn = atoi(++pch);
|
|
} else if(*pch != 'M') { /* n */
|
|
pDstDate->n = atoi(pch);
|
|
} else { /* Mm.n.d */
|
|
|
|
pDstDate->Mm = atoi(++pch);
|
|
|
|
if(*++pch != '.') {
|
|
pch++;
|
|
}
|
|
pDstDate->Mn = atoi(++pch);
|
|
|
|
if(*++pch != '.') {
|
|
pch++;
|
|
}
|
|
pDstDate->Md = atoi(++pch);
|
|
}
|
|
|
|
while(*pch && isdigit(*pch)) {
|
|
pch++;
|
|
}
|
|
|
|
#define IN_RANGE(x, a, b) (x >= a && x <= b)
|
|
|
|
return ((pDstDate->Jn != -1 && IN_RANGE(pDstDate->Jn, 1, 365)) ||
|
|
(pDstDate->n != -1 && IN_RANGE(pDstDate->n, 0, 365)) ||
|
|
(pDstDate->Mm != -1 && IN_RANGE(pDstDate->Mm, 1, 12) &&
|
|
IN_RANGE(pDstDate->Mn, 1, 5) && IN_RANGE(pDstDate->Md, 0, 6)))
|
|
? pch : NULL;
|
|
}
|
|
|
|
/*
|
|
* ParsePosixTime - parse the time element in TZ. The format of time is:
|
|
*
|
|
* hh[:mm[:ss]]
|
|
*
|
|
* ENTRY pch - beginning of the substring in TZ.
|
|
*
|
|
* ptime - pointer to a variable(_starttime or _endtime) storing the
|
|
* time(in seconds) parsed.
|
|
*
|
|
* RETURN pointer to one position after the end of the time element parsed.
|
|
*/
|
|
|
|
static char * __cdecl
|
|
ParsePosixTime(
|
|
REG1 char *pch,
|
|
REG2 long *ptime
|
|
)
|
|
{
|
|
long time;
|
|
|
|
time = atol(pch)*SEC_PER_HOUR; /* hh */
|
|
|
|
while(*pch && isdigit(*pch)) {
|
|
pch++;
|
|
}
|
|
|
|
if(*pch == ':') {
|
|
|
|
time += atol(++pch)*60L; /* mm */
|
|
while(*pch && isdigit(*pch)) {
|
|
pch++;
|
|
}
|
|
|
|
if(*pch == ':') {
|
|
|
|
time += atol(++pch); /* ss */
|
|
while(*pch && isdigit(*pch)) {
|
|
pch++;
|
|
}
|
|
}
|
|
}
|
|
|
|
*ptime = time;
|
|
|
|
return pch;
|
|
}
|
|
|
|
/*
|
|
* tzset - sets the timezone information from the TZ environment variable.
|
|
* Global tzname[], _timezone, _daylight, and _dstoffset will be
|
|
* set. Static _startdate, _enddate, _starttime, and _endtime will
|
|
* also be set. TZ string looks like:
|
|
*
|
|
* stdoffset[dst[offset][,start[/time],end[/time]]]
|
|
*
|
|
* In form of variables: tzname[0]_timezone[tzname[1][_dstoffset]
|
|
* [,_startdate[/_starttime],_enddate[/_endtime]]]
|
|
*
|
|
* ENTRY none.
|
|
*
|
|
* RETURN none.
|
|
*/
|
|
|
|
void __cdecl tzset(
|
|
void
|
|
)
|
|
{
|
|
/* pch points to the beginning of an element to be parsed. */
|
|
REG1 char *pch;
|
|
|
|
/* pchCurr points to one position after the end of last element parsed. */
|
|
REG2 char *pchCurr;
|
|
|
|
char *TZ;
|
|
|
|
_endtime = 7200L;
|
|
_starttime = 7200L;
|
|
|
|
if (!(TZ = getenv("TZ")) || !*TZ) {
|
|
TZ = "PST8PDT7,M4.1.0/2:00,M10.5.0/2:00"; /* use default */
|
|
}
|
|
|
|
if((pchCurr = ParsePosixStdOrDst(pch=TZ)) == NULL) {
|
|
return;
|
|
}
|
|
|
|
memcpy(tzname[0], pch, (int)(pchCurr-pch));
|
|
tzname[0][(int)(pchCurr-pch)] = '\0';
|
|
|
|
if((pchCurr = ParsePosixOffset(pch=pchCurr, &_timezone)) == NULL) {
|
|
return;
|
|
}
|
|
|
|
_daylight = (*pchCurr != '\0');
|
|
|
|
if(!_daylight) {
|
|
return;
|
|
}
|
|
|
|
if((pchCurr = ParsePosixStdOrDst(pch=pchCurr)) == NULL) {
|
|
return;
|
|
}
|
|
|
|
memcpy(tzname[1], pch, (int)(pchCurr-pch));
|
|
tzname[1][(int)(pchCurr-pch)] = '\0';
|
|
|
|
if(isdigit(*pchCurr) || *pchCurr == '-' || *pchCurr == '+') {
|
|
if((pchCurr = ParsePosixOffset(pch=pchCurr, &_dstoffset)) == NULL) {
|
|
return;
|
|
}
|
|
} else {
|
|
/* default: 1 hour ahead of standard time */
|
|
_dstoffset = _timezone - SEC_PER_HOUR;
|
|
}
|
|
|
|
if(*pchCurr == ',') { /* ,start[/time],end[/time] */
|
|
|
|
if((pchCurr = ParsePosixDate(pchCurr+1, &_startdate)) == NULL) {
|
|
goto out;
|
|
}
|
|
|
|
if(*pchCurr == '/') {
|
|
if(!(pchCurr = ParsePosixTime(pchCurr+1, &_starttime))) {
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if(*pchCurr != ',') {
|
|
goto out;
|
|
}
|
|
|
|
if ((pchCurr = ParsePosixDate(pchCurr+1, &_enddate)) == NULL) {
|
|
goto out;
|
|
}
|
|
|
|
if (*pchCurr == '/') {
|
|
if(!(pchCurr = ParsePosixTime(pchCurr+1, &_endtime))) {
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
/*
|
|
* Adjust the _endtime to account for the fact that
|
|
* dst ends at _endtime local time, rather than
|
|
* standard time.
|
|
*/
|
|
|
|
_endtime -= (_timezone - _dstoffset);
|
|
}
|
|
|
|
|
|
#define DAY1 (4) /* Jan 1 1970 was a Thursday */
|
|
|
|
/*
|
|
* GetDstStartOrEndYearDay - Converts day info from DSTDATE into 0-based
|
|
* year-day.
|
|
*
|
|
* ENTRY tm_year - the year concerned(tb->tm_year).
|
|
*
|
|
* pDstDate - pointer to either _startdate or _enddate.
|
|
*
|
|
* RETURN the year-day calculated.
|
|
*/
|
|
|
|
static int __cdecl
|
|
GetDstStartOrEndYearDay(
|
|
REG1 int tm_year,
|
|
REG2 PDSTDATE pDstDate
|
|
)
|
|
{
|
|
REG1 int yday; /* year-day */
|
|
REG2 int theyear;
|
|
|
|
theyear = tm_year + 1900;
|
|
|
|
if(pDstDate->Jn != -1) {
|
|
|
|
/*
|
|
* Jn is in [1, 365] and leap day is not counted.
|
|
* Convert Jn to 0-based yday; Note: 60 is March 1.
|
|
*/
|
|
|
|
|
|
yday = (IS_LEAP_YEAR(theyear) && (pDstDate->Jn >= 60))
|
|
? pDstDate->Jn : pDstDate->Jn - 1;
|
|
|
|
} else if(pDstDate->n != -1) {
|
|
|
|
/*
|
|
* n is in [0, 365] and leap day is counted.
|
|
*/
|
|
|
|
yday = pDstDate->n;
|
|
|
|
} else { /* Mm.n.d */
|
|
|
|
int *ptrday;
|
|
int years;
|
|
int wday;
|
|
|
|
/*
|
|
* We first need to calculate year-day(yday) and week-day
|
|
* (wday) of 1st day of month pDstDate->Mm. We then figure
|
|
* out year-day(yday) of Md day of week Mn of month Mm.
|
|
*/
|
|
|
|
ptrday = IS_LEAP_YEAR(theyear) ? _lpdays : _days;
|
|
|
|
yday = ptrday[pDstDate->Mm-1] + 1; /* ptrday[i] are all by -1 off */
|
|
|
|
years = tm_year - 70;
|
|
|
|
/*
|
|
* Here constant Day1 is the week-day of Jan 1, 1970.
|
|
* (years+1)/4 is for correcting the leap years.
|
|
*/
|
|
|
|
wday = (yday + 365*years + (years+1)/4 + DAY1) % 7;
|
|
|
|
/*
|
|
* Calculate yday of Md day of week 1 of month Mm.
|
|
*/
|
|
|
|
yday += pDstDate->Md - wday;
|
|
if(pDstDate->Md < wday) {
|
|
yday += 7;
|
|
}
|
|
|
|
/*
|
|
* Calculate yday of Md day of week Mn of month Mm.
|
|
*/
|
|
|
|
yday += (pDstDate->Mn-1)*7;
|
|
|
|
/*
|
|
* Adjust if yday goes beyond the end of the month.
|
|
*/
|
|
|
|
if(pDstDate->Md == 5 && yday >= ptrday[pDstDate->Mm] + 1) {
|
|
yday -= 7;
|
|
}
|
|
|
|
}
|
|
|
|
return yday;
|
|
}
|
|
|
|
/*
|
|
* _isindst - Tells whether Xenix-type time value falls under DST.
|
|
*
|
|
* ENTRY tb - 'time' structure holding broken-down time value.
|
|
*
|
|
* RETURN 1 if time represented is in DST, else 0.
|
|
*/
|
|
|
|
int __cdecl _isindst (
|
|
REG1 struct tm *tb
|
|
)
|
|
{
|
|
int st_yday, end_yday;
|
|
int st_sec, end_sec;
|
|
|
|
int check_time;
|
|
|
|
/*
|
|
* We need start/end year-days of DST in syday/eyday which are converted
|
|
* from one of the format Jn, n, and Mm.n.d. We already have start/end
|
|
* time (in seconds) of DST in _starttime/_endtime.
|
|
*/
|
|
|
|
st_yday = GetDstStartOrEndYearDay(tb->tm_year, &_startdate);
|
|
end_yday = GetDstStartOrEndYearDay(tb->tm_year, &_enddate);
|
|
|
|
st_sec = st_yday * SEC_PER_DAY + _starttime;
|
|
end_sec = end_yday * SEC_PER_DAY + _endtime;
|
|
|
|
check_time = tb->tm_yday * SEC_PER_DAY + tb->tm_hour * SEC_PER_HOUR
|
|
+ tb->tm_min * 60 + tb->tm_sec;
|
|
|
|
if (check_time >= st_sec && check_time < end_sec)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* _isskiptime - Tells whether the given time is skipped at the
|
|
* dst change. For instance, we set our clocks forward one
|
|
* hour at 2am to 3am... This function returns true for
|
|
* the times between 1:59:59 and 3:00:00.
|
|
*
|
|
* ENTRY tb - 'time' structure holding broken-down time value.
|
|
*
|
|
* RETURN 1 if time represented is in the skipped period, 0
|
|
* otherwise.
|
|
*/
|
|
|
|
int __cdecl _isskiptime (
|
|
REG1 struct tm *tb
|
|
)
|
|
{
|
|
int st_yday;
|
|
int st_sec;
|
|
int check_time;
|
|
|
|
st_yday = GetDstStartOrEndYearDay(tb->tm_year, &_startdate);
|
|
st_sec = st_yday * SEC_PER_DAY + _starttime;
|
|
|
|
check_time = tb->tm_yday * SEC_PER_DAY + tb->tm_hour * SEC_PER_HOUR
|
|
+ tb->tm_min * 60 + tb->tm_sec;
|
|
|
|
if (check_time >= st_sec && check_time < st_sec - _dstoffset) {
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif /* _POSIX_ */
|