236 lines
7.8 KiB
C
236 lines
7.8 KiB
C
|
/***
|
||
|
|
*dtoxtime.c - convert OS local time to time_t
|
||
|
|
*
|
||
|
|
* Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.
|
||
|
|
*
|
||
|
|
*Purpose:
|
||
|
|
* defines __loctotime_t() - convert OS local time to internal format
|
||
|
|
* (time_t).
|
||
|
|
*
|
||
|
|
*Revision History:
|
||
|
|
* 03-??-84 RLB written
|
||
|
|
* 11-18-87 SKS change tzset() to __tzset(), change source file name
|
||
|
|
* make _dtoxtime a near procedure
|
||
|
|
* 01-26-88 SKS _dtoxtime is no longer a near procedure (for QC)
|
||
|
|
* 03-20-90 GJF Made calling type _CALLTYPE1, added #include
|
||
|
|
* <cruntime.h>, removed #include <register.h> and
|
||
|
|
* fixed the copyright. Also, cleaned up the formatting
|
||
|
|
* a bit.
|
||
|
|
* 10-04-90 GJF New-style function declarator.
|
||
|
|
* 01-21-91 GJF ANSI naming.
|
||
|
|
* 05-19-92 DJM ifndef for POSIX build.
|
||
|
|
* 03-30-93 GJF Revised. Old _dtoxtime is replaced by __gmtotime_t,
|
||
|
|
* which is more useful on Win32.
|
||
|
|
* 04-06-93 SKS Replace _CRTAPI* with __cdecl
|
||
|
|
* 04-06-93 GJF Rewrote computation to avoid compiler warnings.
|
||
|
|
* 07-20-93 GJF Replaced __gmtotime_t with function very similar to
|
||
|
|
* _dostotime_t() in 16-bit C 8.00. The reason for the
|
||
|
|
* change is that only local time values can be trusted
|
||
|
|
* on a Win32 platform. System time may be UTC (as
|
||
|
|
* documented), and is on NT, or may be the same as
|
||
|
|
* local time, as on Win32S and Win32C
|
||
|
|
* 02-10-95 GJF Appended Mac version of source file (somewhat cleaned
|
||
|
|
* up), with appropriate #ifdef-s.
|
||
|
|
* 09-25-95 GJF Added DST flag to __loctotime_t's arguments. Also,
|
||
|
|
* use _dstbias instead of assuming a DST bias of -3600.
|
||
|
|
* 02-07-98 GJF Changes for Win64: replaced long type with time_t
|
||
|
|
* 10-19-98 GJF Fill in tm_min and tm_sec before calling _isindst
|
||
|
|
* 05-17-99 PML Remove all Macintosh support.
|
||
|
|
* 12-10-99 GB Added support for years beyond 2099.
|
||
|
|
*
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
#ifndef _POSIX_
|
||
|
|
|
||
|
|
#include <cruntime.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <ctime.h>
|
||
|
|
#include <internal.h>
|
||
|
|
|
||
|
|
/***
|
||
|
|
*time_t __loctotime_t(yr, mo, dy, hr, mn, sc, dstflag) - converts OS local
|
||
|
|
* time to internal time format (i.e., a time_t value)
|
||
|
|
*
|
||
|
|
*Purpose:
|
||
|
|
* Converts a local time value, obtained in a broken down format from
|
||
|
|
* the host OS, to time_t format (i.e., the number elapsed seconds since
|
||
|
|
* 01-01-70, 00:00:00, UTC).
|
||
|
|
*
|
||
|
|
*Entry:
|
||
|
|
* int yr, mo, dy - date
|
||
|
|
* int hr, mn, sc - time
|
||
|
|
* int dstflag - 1 if Daylight Time, 0 if Standard Time, -1 if
|
||
|
|
* not specified.
|
||
|
|
*
|
||
|
|
*Exit:
|
||
|
|
* Returns calendar time value.
|
||
|
|
*
|
||
|
|
*Exceptions:
|
||
|
|
*
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
time_t __cdecl __loctotime_t (
|
||
|
|
int yr, /* 0 based */
|
||
|
|
int mo, /* 1 based */
|
||
|
|
int dy, /* 1 based */
|
||
|
|
int hr,
|
||
|
|
int mn,
|
||
|
|
int sc,
|
||
|
|
int dstflag )
|
||
|
|
{
|
||
|
|
int tmpdays;
|
||
|
|
time_t tmptim;
|
||
|
|
struct tm tb;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Do a quick range check on the year and convert it to a delta
|
||
|
|
* off of 1900.
|
||
|
|
*/
|
||
|
|
if ( ((yr -= 1900) < _BASE_YEAR) || (yr > _MAX_YEAR) )
|
||
|
|
return (time_t)(-1);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Compute the number of elapsed days in the current year. Note the
|
||
|
|
* test for a leap year would fail in the year 2100, if this was in
|
||
|
|
* range (which it isn't).
|
||
|
|
*/
|
||
|
|
tmpdays = dy + _days[mo - 1];
|
||
|
|
if ( _IS_LEAP_YEAR(yr) && (mo > 2) )
|
||
|
|
tmpdays++;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Compute the number of elapsed seconds since the Epoch. Note the
|
||
|
|
* computation of elapsed leap years would break down after 2100
|
||
|
|
* if such values were in range (fortunately, they aren't).
|
||
|
|
*/
|
||
|
|
tmptim = /* 365 days for each year */
|
||
|
|
(((time_t)yr - _BASE_YEAR) * 365
|
||
|
|
|
||
|
|
/* one day for each elapsed leap year */
|
||
|
|
+ (time_t)_ELAPSED_LEAP_YEARS(yr)
|
||
|
|
|
||
|
|
/* number of elapsed days in yr */
|
||
|
|
+ tmpdays)
|
||
|
|
|
||
|
|
/* convert to hours and add in hr */
|
||
|
|
* 24 + hr;
|
||
|
|
|
||
|
|
tmptim = /* convert to minutes and add in mn */
|
||
|
|
(tmptim * 60 + mn)
|
||
|
|
|
||
|
|
/* convert to seconds and add in sec */
|
||
|
|
* 60 + sc;
|
||
|
|
/*
|
||
|
|
* Account for time zone.
|
||
|
|
*/
|
||
|
|
__tzset();
|
||
|
|
tmptim += _timezone;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Fill in enough fields of tb for _isindst(), then call it to
|
||
|
|
* determine DST.
|
||
|
|
*/
|
||
|
|
tb.tm_yday = tmpdays;
|
||
|
|
tb.tm_year = yr;
|
||
|
|
tb.tm_mon = mo - 1;
|
||
|
|
tb.tm_hour = hr;
|
||
|
|
tb.tm_min = mn;
|
||
|
|
tb.tm_sec = sc;
|
||
|
|
if ( (dstflag == 1) || ((dstflag == -1) && _daylight &&
|
||
|
|
_isindst(&tb)) )
|
||
|
|
tmptim += _dstbias;
|
||
|
|
return(tmptim);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#if 0
|
||
|
|
|
||
|
|
/*
|
||
|
|
* THE FOLLOWING FUNCTION WAS DEFINED AND USED (IN PLACE OF THE ONE ABOVE)
|
||
|
|
* FOR THE CUDA PRODUCT AND THE NT 1.0 SDK. IT WAS REPLACED (BY THE ONE
|
||
|
|
* ABOVE) BECAUSE NON-NT WIN32 PLATFORMS MAY USE LOCAL TIME FOR SYSTEM TIME,
|
||
|
|
* RATHER THAN UTC.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/***
|
||
|
|
*time_t __gmtotime_t(yr, mo, dy, hr, mn, sc) - convert broken down time (UTC)
|
||
|
|
* to time_t
|
||
|
|
*
|
||
|
|
*Purpose:
|
||
|
|
* Converts a broken down UTC (GMT) time to time_t. This is similar to
|
||
|
|
* _mkgmtime() except there is minimal overflow checking and no updating
|
||
|
|
* of the input values (i.e., the fields of tm structure).
|
||
|
|
*
|
||
|
|
*Entry:
|
||
|
|
* int yr, mo, dy - date
|
||
|
|
* int hr, mn, sc - time
|
||
|
|
*
|
||
|
|
*Exit:
|
||
|
|
* returns time_t value
|
||
|
|
*
|
||
|
|
*Exceptions:
|
||
|
|
*
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
time_t __cdecl __gmtotime_t (
|
||
|
|
int yr, /* 0 based */
|
||
|
|
int mo, /* 1 based */
|
||
|
|
int dy, /* 1 based */
|
||
|
|
int hr,
|
||
|
|
int mn,
|
||
|
|
int sc
|
||
|
|
)
|
||
|
|
{
|
||
|
|
int tmpdays;
|
||
|
|
long tmptim;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Do a quick range check on the year and convert it to a delta
|
||
|
|
* off of 1900.
|
||
|
|
*/
|
||
|
|
if ( ((long)(yr -= 1900) < _BASE_YEAR) || ((long)yr > _MAX_YEAR) )
|
||
|
|
return (time_t)(-1);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Compute the number of elapsed days in the current year minus
|
||
|
|
* one. Note the test for leap year and the would fail in the year 2100
|
||
|
|
* if this was in range (which it isn't).
|
||
|
|
*/
|
||
|
|
tmpdays = dy + _days[mo - 1];
|
||
|
|
if ( !(yr & 3) && (mo > 2) )
|
||
|
|
/*
|
||
|
|
* in a leap year, after Feb. add one day for elapsed
|
||
|
|
* Feb 29.
|
||
|
|
*/
|
||
|
|
tmpdays++;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Compute the number of elapsed seconds since the Epoch. Note the
|
||
|
|
* computation of elapsed leap years would break down after 2100
|
||
|
|
* if such values were in range (fortunately, they aren't).
|
||
|
|
*/
|
||
|
|
tmptim = /* 365 days for each year */
|
||
|
|
(((long)yr - _BASE_YEAR) * 365L
|
||
|
|
|
||
|
|
/* one day for each elapsed leap year */
|
||
|
|
+ (long)((yr - 1) >> 2) - _LEAP_YEAR_ADJUST
|
||
|
|
|
||
|
|
/* number of elapsed days in yr */
|
||
|
|
+ tmpdays)
|
||
|
|
|
||
|
|
/* convert to hours and add in hr */
|
||
|
|
* 24L + hr;
|
||
|
|
|
||
|
|
tmptim = /* convert to minutes and add in mn */
|
||
|
|
(tmptim * 60L + mn)
|
||
|
|
|
||
|
|
/* convert to seconds and add in sec */
|
||
|
|
* 60L + sc;
|
||
|
|
|
||
|
|
return (tmptim >= 0) ? (time_t)tmptim : (time_t)(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* _POSIX_ */
|