70 lines
2.7 KiB
C
70 lines
2.7 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: Platform independent mktime() implementation.
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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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_WCRTLINK time_t mktime( struct tm *t )
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{
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long days;
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long seconds;
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long day_seconds;
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seconds = __local_mktime( t, &days, &day_seconds );
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__brktime( (unsigned long) days, (time_t) day_seconds, 0L, t );
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tzset();
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seconds += _RWD_timezone; /* add in seconds from GMT */
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#ifdef __LINUX__
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if( t->tm_isdst < 0 )
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__check_tzfile( seconds, t );
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#endif
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/* if we are in d.s.t. then subtract __dst_adjust from seconds */
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if( __isindst( t ) ) /* - determine if we are in d.s.t. */
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seconds -= _RWD_dst_adjust;
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#ifdef __UNIX__ /* time_t is signed */
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if( seconds < 0 )
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return( ( time_t ) -1 );
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#else /* time_t is unsigned, special day check needed for 31 dec 1969 */
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/* check for overflow; days == 75277 && seconds == 23296 returns 0, but
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adjusted for dst may still be fine */
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if( days >= 75279 ||
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( seconds >= 0 && days >= 75276 ) ||
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( seconds < 0 && days <= DAYS_FROM_1900_TO_1970 ) )
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return( (time_t) -1 );
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/* 0 is year = 206, mon = 1, mday = 7, hour = 6, min = 28, sec = 16 */
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#endif
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return( ( time_t ) seconds );
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}
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