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104 lines
4.1 KiB
C
104 lines
4.1 KiB
C
/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: mktime() without timezone and struct tm fields adjustment.
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* used by mktime() and DOS clock()
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*
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****************************************************************************/
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#include "variety.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <limits.h>
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#include "rtdata.h"
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#include "timedata.h"
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#define MONTH_YR ( 12 )
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#define DAY_YR ( 365 )
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#define HOUR_YR ( DAY_YR * 24 )
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#define MINUTE_YR ( HOUR_YR * 60 )
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#define SECOND_YR ( MINUTE_YR * 60 )
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#define __MONTHS ( INT_MIN / MONTH_YR )
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#define __DAYS ( INT_MIN / DAY_YR )
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// these ones can underflow in 16bit environments,
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// so check the relative values first
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#if ( HOUR_YR ) < ( INT_MAX / 60 )
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#define __MINUTES ( INT_MIN / MINUTE_YR )
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#if ( MINUTE_YR ) < ( INT_MAX / 60 )
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#define __SECONDS ( INT_MIN / SECOND_YR )
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#else
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#define __SECONDS ( 0 )
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#endif
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#else
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#define __MINUTES ( 0 )
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#define __SECONDS ( 0 )
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#endif
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#define SMALLEST_YEAR_VALUE ( __MONTHS + __DAYS + __MINUTES + __SECONDS )
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time_t __local_mktime( const struct tm *t, long *pdays, long *pseconds )
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{
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int month;
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int year;
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long days;
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long seconds;
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short const *month_start;
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month_start = __diyr;
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month = t->tm_mon % 12; /* put tm_mon into range */
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year = t->tm_year;
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if( year < SMALLEST_YEAR_VALUE )
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return( ( time_t ) -1 );
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year += t->tm_mon / 12;
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while( month < 0 )
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--year, month += 12;
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if( year < 0 )
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return( ( time_t ) -1 );
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if( __leapyear( ( unsigned ) ( year + 1900 ) ) )
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month_start = __dilyr;
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days = year * 365L /* # of days in the years */
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+ ( ( year + 3 ) / 4 ) /* add # of leap years before year */
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- ( ( year + 99 ) / 100 ) /* sub # of leap centuries */
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+ ( ( year + 399 - 100 ) / 400 ) /* add # of leap 4 centuries */
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/* adjust for 1900 offset */
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/* note: -100 == 300 (mod 400) */
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+ month_start[month] /* # of days to 1st of month*/
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+ t->tm_mday - 1; /* day of the month */
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seconds = ( ( ( long ) ( t->tm_hour ) ) *60L + ( long ) ( t->tm_min ) ) *60L + t->tm_sec;
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/* seconds needs to be positive for __brktime */
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while( seconds < 0 )
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days -= 1, seconds += ( long ) SECONDS_PER_DAY;
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while( seconds >= ( long ) SECONDS_PER_DAY )
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days += 1, seconds -= ( long ) SECONDS_PER_DAY;
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if( days < ( DAYS_FROM_1900_TO_1970 - 1 ) )
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return( ( time_t ) -1 );
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if ( pdays ) *pdays = days;
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if ( pseconds ) *pseconds = seconds;
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return( seconds + ( days - DAYS_FROM_1900_TO_1970 ) * ( long ) SECONDS_PER_DAY );
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}
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