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  1. /****************************************************************************
  2. *
  3. *                            Open Watcom Project
  4. *
  5. *    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
  6. *
  7. *  ========================================================================
  8. *
  9. *    This file contains Original Code and/or Modifications of Original
  10. *    Code as defined in and that are subject to the Sybase Open Watcom
  11. *    Public License version 1.0 (the 'License'). You may not use this file
  12. *    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
  13. *    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
  14. *    provided with the Original Code and Modifications, and is also
  15. *    available at www.sybase.com/developer/opensource.
  16. *
  17. *    The Original Code and all software distributed under the License are
  18. *    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  19. *    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
  20. *    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
  21. *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
  22. *    NON-INFRINGEMENT. Please see the License for the specific language
  23. *    governing rights and limitations under the License.
  24. *
  25. *  ========================================================================
  26. *
  27. * Description:  Platform independent mktime() implementation.
  28. *
  29. ****************************************************************************/
  30.  
  31. #include "variety.h"
  32. #include <stdio.h>
  33. #include <stdlib.h>
  34. #include <time.h>
  35. #include <limits.h>
  36. #include "rtdata.h"
  37. #include "timedata.h"
  38.  
  39. _WCRTLINK time_t mktime( struct tm *t )
  40. {
  41.     long        days;
  42.     long        seconds;
  43.     long        day_seconds;
  44.  
  45.     seconds = __local_mktime( t, &days, &day_seconds );
  46.     __brktime( (unsigned long) days, (time_t) day_seconds, 0L, t );
  47.     tzset();
  48.     seconds += _RWD_timezone; /* add in seconds from GMT */
  49. #ifdef __LINUX__
  50.     if( t->tm_isdst < 0 )
  51.         __check_tzfile( seconds, t );
  52. #endif
  53.     /* if we are in d.s.t. then subtract __dst_adjust from seconds */
  54.     if( __isindst( t ) )  /* - determine if we are in d.s.t. */
  55.         seconds -= _RWD_dst_adjust;
  56. #ifdef __UNIX__               /* time_t is signed */
  57.     if( seconds < 0 )
  58.         return( ( time_t ) -1 );
  59. #else /* time_t is unsigned, special day check needed for 31 dec 1969 */
  60.     /* check for overflow; days == 75277 && seconds == 23296 returns 0, but
  61.        adjusted for dst may still be fine */
  62.     if( days >= 75279 ||
  63.         ( seconds >= 0 && days >= 75276 ) ||
  64.         ( seconds < 0 && days <= DAYS_FROM_1900_TO_1970 ) )
  65.         return( (time_t) -1 );
  66.     /* 0 is year = 206, mon = 1, mday = 7, hour = 6, min = 28, sec = 16 */
  67. #endif
  68.     return( ( time_t ) seconds );
  69. }
  70.