mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
155 lines
4.3 KiB
155 lines
4.3 KiB
/***
|
|
*gmtime64.c - breaks down a time value into GMT date/time info
|
|
*
|
|
* Copyright (c) 1998-2001, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* defines _gmtime64() - breaks the clock value down into GMT time/date
|
|
* information; returns pointer to structure with the data.
|
|
*
|
|
*Revision History:
|
|
* 05-13-98 GJF Created. Adapted from Win64 version of _gmtime64.c.
|
|
* 06-12-98 GJF Fixed elapsed years calculation.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#include <cruntime.h>
|
|
#include <time.h>
|
|
#include <ctime.h>
|
|
#include <stddef.h>
|
|
#include <internal.h>
|
|
#include <mtdll.h>
|
|
#ifdef _MT
|
|
#include <malloc.h>
|
|
#include <stddef.h>
|
|
#endif
|
|
#include <dbgint.h>
|
|
|
|
static struct tm tb = { 0 }; /* time block */
|
|
|
|
/***
|
|
*struct tm *_gmtime64(timp) - convert *timp to a structure (UTC)
|
|
*
|
|
*Purpose:
|
|
* Converts the calendar time value, in internal 64-bit format to
|
|
* broken-down time (tm structure) with the corresponding UTC time.
|
|
*
|
|
*Entry:
|
|
* const __time64_t *timp - pointer to time_t value to convert
|
|
*
|
|
*Exit:
|
|
* returns pointer to filled-in tm structure.
|
|
* returns NULL if *timp < 0
|
|
*
|
|
*Exceptions:
|
|
*
|
|
*******************************************************************************/
|
|
|
|
struct tm * __cdecl _gmtime64 (
|
|
const __time64_t *timp
|
|
)
|
|
{
|
|
|
|
__time64_t caltim = *timp; /* calendar time to convert */
|
|
int islpyr = 0; /* is-current-year-a-leap-year flag */
|
|
int tmptim;
|
|
int *mdays; /* pointer to days or lpdays */
|
|
|
|
#ifdef _MT
|
|
|
|
struct tm *ptb; /* will point to gmtime buffer */
|
|
_ptiddata ptd = _getptd();
|
|
|
|
#else
|
|
struct tm *ptb = &tb;
|
|
#endif
|
|
|
|
if ( (caltim < 0) || (caltim > _MAX__TIME64_T) )
|
|
return(NULL);
|
|
|
|
#ifdef _MT
|
|
|
|
/* Use per thread buffer area (malloc space, if necessary) */
|
|
|
|
if ( (ptd->_gmtimebuf != NULL) || ((ptd->_gmtimebuf =
|
|
_malloc_crt(sizeof(struct tm))) != NULL) )
|
|
ptb = ptd->_gmtimebuf;
|
|
else
|
|
ptb = &tb; /* malloc error: use static buffer */
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Determine the years since 1900. Start by ignoring leap years.
|
|
*/
|
|
tmptim = (int)(caltim / _YEAR_SEC) + 70;
|
|
caltim -= ((__time64_t)(tmptim - 70) * _YEAR_SEC);
|
|
|
|
/*
|
|
* Correct for elapsed leap years
|
|
*/
|
|
caltim -= ((__time64_t)_ELAPSED_LEAP_YEARS(tmptim) * _DAY_SEC);
|
|
|
|
/*
|
|
* If we have underflowed the __time64_t range (i.e., if caltim < 0),
|
|
* back up one year, adjusting the correction if necessary.
|
|
*/
|
|
if ( caltim < 0 ) {
|
|
caltim += (__time64_t)_YEAR_SEC;
|
|
tmptim--;
|
|
if ( _IS_LEAP_YEAR(tmptim) ) {
|
|
caltim += _DAY_SEC;
|
|
islpyr++;
|
|
}
|
|
}
|
|
else
|
|
if ( _IS_LEAP_YEAR(tmptim) )
|
|
islpyr++;
|
|
|
|
/*
|
|
* tmptim now holds the value for tm_year. caltim now holds the
|
|
* number of elapsed seconds since the beginning of that year.
|
|
*/
|
|
ptb->tm_year = tmptim;
|
|
|
|
/*
|
|
* Determine days since January 1 (0 - 365). This is the tm_yday value.
|
|
* Leave caltim with number of elapsed seconds in that day.
|
|
*/
|
|
ptb->tm_yday = (int)(caltim / _DAY_SEC);
|
|
caltim -= (__time64_t)(ptb->tm_yday) * _DAY_SEC;
|
|
|
|
/*
|
|
* Determine months since January (0 - 11) and day of month (1 - 31)
|
|
*/
|
|
if ( islpyr )
|
|
mdays = _lpdays;
|
|
else
|
|
mdays = _days;
|
|
|
|
|
|
for ( tmptim = 1 ; mdays[tmptim] < ptb->tm_yday ; tmptim++ ) ;
|
|
|
|
ptb->tm_mon = --tmptim;
|
|
|
|
ptb->tm_mday = ptb->tm_yday - mdays[tmptim];
|
|
|
|
/*
|
|
* Determine days since Sunday (0 - 6)
|
|
*/
|
|
ptb->tm_wday = ((int)(*timp / _DAY_SEC) + _BASE_DOW) % 7;
|
|
|
|
/*
|
|
* Determine hours since midnight (0 - 23), minutes after the hour
|
|
* (0 - 59), and seconds after the minute (0 - 59).
|
|
*/
|
|
ptb->tm_hour = (int)(caltim / 3600);
|
|
caltim -= (__time64_t)ptb->tm_hour * 3600L;
|
|
|
|
ptb->tm_min = (int)(caltim / 60);
|
|
ptb->tm_sec = (int)(caltim - (ptb->tm_min) * 60);
|
|
|
|
ptb->tm_isdst = 0;
|
|
return( (struct tm *)ptb );
|
|
|
|
}
|