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/* Check that daylight is set if the last DST transition did not change offset.
Copyright (C) 2023-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdlib.h>
#include <support/check.h>
#include <time.h>
/* Set the specified time zone with error checking. */
static void
set_timezone (const char *name)
{
TEST_VERIFY (setenv ("TZ", name, 1) == 0);
errno = 0;
tzset ();
TEST_COMPARE (errno, 0);
}
static int
do_test (void)
{
/* Test zone based on tz-2022g version of Africa/Tripoli. The last
DST transition coincided with a change in the standard time
offset, effectively making it a no-op.
Africa/Tripoli Thu Oct 24 23:59:59 2013 UT
= Fri Oct 25 01:59:59 2013 CEST isdst=1 gmtoff=7200
Africa/Tripoli Fri Oct 25 00:00:00 2013 UT
= Fri Oct 25 02:00:00 2013 EET isdst=0 gmtoff=7200
*/
set_timezone ("XT6");
TEST_VERIFY (daylight != 0);
TEST_COMPARE (timezone, -7200);
/* Check that localtime re-initializes the two variables. */
daylight = timezone = 17;
time_t t = 844034401;
struct tm *tm = localtime (&t);
TEST_VERIFY (daylight != 0);
TEST_COMPARE (timezone, -7200);
TEST_COMPARE (tm->tm_year, 96);
TEST_COMPARE (tm->tm_mon, 8);
TEST_COMPARE (tm->tm_mday, 29);
TEST_COMPARE (tm->tm_hour, 23);
TEST_COMPARE (tm->tm_min, 0);
TEST_COMPARE (tm->tm_sec, 1);
TEST_COMPARE (tm->tm_gmtoff, 3600);
TEST_COMPARE (tm->tm_isdst, 0);
return 0;
}
#include <support/test-driver.c>
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