StdLib/LibC/Time/TimeEfi.c

   1 /** @file
   2   Transformations between the EFI_TIME structure and struct tm or time_t.
   3
   4   Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
   5   This program and the accompanying materials are licensed and made available under
   6   the terms and conditions of the BSD License that accompanies this distribution.
   7   The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php.
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14 #include  <Uefi.h>
  15
  16 #include  <LibConfig.h>
  17
  18 #include  <time.h>
  19 #include  "tzfile.h"
  20 #include  <MainData.h>
  21
  22 /* Convert an EFI_TIME structure into a C Standard tm structure. */
  23 void
  24 Efi2Tm( EFI_TIME *ET, struct tm *BT)
  25 {
  26   // Convert EFI time to broken-down time.
  27   BT->tm_year = ET->Year - TM_YEAR_BASE;
  28   BT->tm_mon = ET->Month - 1;   // BD time is zero based, EFI is 1 based
  29   BT->tm_mday = ET->Day;
  30   BT->tm_hour = ET->Hour;
  31   BT->tm_min = ET->Minute;
  32   BT->tm_sec = ET->Second;
  33   BT->tm_isdst = -1;
  34   BT->tm_zoneoff = ET->TimeZone;
  35   BT->tm_daylight = ET->Daylight;
  36   BT->tm_Nano = ET->Nanosecond;
  37 }
  38
  39 /* Convert an EFI_TIME structure into a time_t value. */
  40 time_t
  41 Efi2Time( EFI_TIME *EfiBDtime)
  42 {
  43   Efi2Tm( EfiBDtime, &gMD->BDTime);
  44
  45   return mktime( &gMD->BDTime);
  46 }