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35141f304e
The daylight variable is supposed to be set to 1 if DST is ever in use for the current time zone. But __tzfile_read used to do this: __daylight = rule_stdoff != rule_dstoff; This check can fail to set __daylight to 1 if the DST and non-DST offsets happen to be the same.
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/* Check that daylight is set if the last DST transition did not change offset.
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Copyright (C) 2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <time.h>
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/* Set the specified time zone with error checking. */
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static void
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set_timezone (const char *name)
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{
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TEST_VERIFY (setenv ("TZ", name, 1) == 0);
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errno = 0;
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tzset ();
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TEST_COMPARE (errno, 0);
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}
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static int
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do_test (void)
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{
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/* Test zone based on tz-2022g version of Africa/Tripoli. The last
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DST transition coincided with a change in the standard time
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offset, effectively making it a no-op.
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Africa/Tripoli Thu Oct 24 23:59:59 2013 UT
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= Fri Oct 25 01:59:59 2013 CEST isdst=1 gmtoff=7200
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Africa/Tripoli Fri Oct 25 00:00:00 2013 UT
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= Fri Oct 25 02:00:00 2013 EET isdst=0 gmtoff=7200
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*/
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set_timezone ("XT6");
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TEST_VERIFY (daylight != 0);
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TEST_COMPARE (timezone, -7200);
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/* Check that localtime re-initializes the two variables. */
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daylight = timezone = 17;
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time_t t = 844034401;
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struct tm *tm = localtime (&t);
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TEST_VERIFY (daylight != 0);
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TEST_COMPARE (timezone, -7200);
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TEST_COMPARE (tm->tm_year, 96);
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TEST_COMPARE (tm->tm_mon, 8);
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TEST_COMPARE (tm->tm_mday, 29);
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TEST_COMPARE (tm->tm_hour, 23);
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TEST_COMPARE (tm->tm_min, 0);
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TEST_COMPARE (tm->tm_sec, 1);
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TEST_COMPARE (tm->tm_gmtoff, 3600);
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TEST_COMPARE (tm->tm_isdst, 0);
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return 0;
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}
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#include <support/test-driver.c>
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