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/***
*dtoxtime.c - convert broken-down UTC time to time_t
*
* Copyright (c) 1985-1993, Microsoft Corporation. All rights reserved.
*
*Purpose:
* defines __gmtotime_t() - convert broken-down UTC 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 GJF Rewrote computation to avoid compiler warnings.
*
*******************************************************************************/
#ifndef _POSIX_
#include <cruntime.h>
#include <time.h>
#include <ctime.h>
#include <internal.h>
/***
*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 _CRTAPI1 __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 /* _POSIX_ */
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