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/* Basic tests for timegm.
Copyright (C) 2021-2025 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 <time.h>
#include <stdlib.h>
#include <support/check.h>
static void
do_test_func (time_t (*func)(struct tm *))
{
{
struct tm tmg =
{
.tm_sec = 0,
.tm_min = 0,
.tm_hour = 0,
.tm_mday = 1,
.tm_mon = 0,
.tm_year = 70,
.tm_wday = 4,
.tm_yday = 0,
.tm_isdst = 0
};
time_t t = func (&tmg);
TEST_COMPARE (t, 0);
}
{
struct tm tmg =
{
.tm_sec = 7,
.tm_min = 14,
.tm_hour = 3,
.tm_mday = 19,
.tm_mon = 0,
.tm_year = 138,
.tm_wday = 2,
.tm_yday = 18,
.tm_isdst = 0
};
time_t t = func (&tmg);
TEST_COMPARE (t, 0x7fffffff);
}
if (sizeof (time_t) < 8)
return;
{
struct tm tmg =
{
.tm_sec = 8,
.tm_min = 14,
.tm_hour = 3,
.tm_mday = 19,
.tm_mon = 0,
.tm_year = 138,
.tm_wday = 2,
.tm_yday = 18,
.tm_isdst = 0
};
time_t t = func (&tmg);
TEST_COMPARE (t, (time_t) 0x80000000ull);
}
}
static int
do_test (void)
{
do_test_func (timegm);
/* timelocal is an alias to mktime and behaves like timegm with the
difference that it takes timezone into account. */
TEST_VERIFY_EXIT (setenv ("TZ", ":", 1) == 0);
tzset ();
do_test_func (timelocal);
return 0;
}
#include <support/test-driver.c>
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