timezone/tst-bz29951.c

   1 /* Check that daylight is set if the last DST transition did not change offset.
   2    Copyright (C) 2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <stdlib.h>
  21 #include <support/check.h>
  22 #include <time.h>
  23
  24 /* Set the specified time zone with error checking.  */
  25 static void
  26 set_timezone (const char *name)
  27 {
  28   TEST_VERIFY (setenv ("TZ", name, 1) == 0);
  29   errno = 0;
  30   tzset ();
  31   TEST_COMPARE (errno, 0);
  32 }
  33
  34 static int
  35 do_test (void)
  36 {
  37   /* Test zone based on tz-2022g version of Africa/Tripoli.  The last
  38      DST transition coincided with a change in the standard time
  39      offset, effectively making it a no-op.
  40
  41      Africa/Tripoli  Thu Oct 24 23:59:59 2013 UT
  42        = Fri Oct 25 01:59:59 2013 CEST isdst=1 gmtoff=7200
  43      Africa/Tripoli  Fri Oct 25 00:00:00 2013 UT
  44        = Fri Oct 25 02:00:00 2013 EET isdst=0 gmtoff=7200
  45    */
  46   set_timezone ("XT6");
  47   TEST_VERIFY (daylight != 0);
  48   TEST_COMPARE (timezone, -7200);
  49
  50   /* Check that localtime re-initializes the two variables.  */
  51   daylight = timezone = 17;
  52   time_t t = 844034401;
  53   struct tm *tm = localtime (&t);
  54   TEST_VERIFY (daylight != 0);
  55   TEST_COMPARE (timezone, -7200);
  56   TEST_COMPARE (tm->tm_year, 96);
  57   TEST_COMPARE (tm->tm_mon, 8);
  58   TEST_COMPARE (tm->tm_mday, 29);
  59   TEST_COMPARE (tm->tm_hour, 23);
  60   TEST_COMPARE (tm->tm_min, 0);
  61   TEST_COMPARE (tm->tm_sec, 1);
  62   TEST_COMPARE (tm->tm_gmtoff, 3600);
  63   TEST_COMPARE (tm->tm_isdst, 0);
  64
  65   return 0;
  66 }
  67
  68 #include <support/test-driver.c>