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/* Test for mktime (4)
Copyright (C) 2021-2023 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>
const struct tm tm0 =
{
.tm_year = 70,
.tm_mon = 0,
.tm_mday = 1,
.tm_hour = 0,
.tm_min = 0,
.tm_sec = 0,
.tm_wday = 4,
.tm_yday = 0,
};
const struct tm tmY2038 =
{
.tm_year = 138,
.tm_mon = 0,
.tm_mday = 19,
.tm_hour = 3,
.tm_min = 14,
.tm_sec = 7,
};
const struct tm tm32bitmax =
{
.tm_year = 206,
.tm_mon = 1,
.tm_mday = 7,
.tm_hour = 6,
.tm_min = 28,
.tm_sec = 15,
};
static
int test_mktime_helper (struct tm *tm, long long int exp_val, int line)
{
time_t result, t;
/* Check if we run on port with 32 bit time_t size. */
if (__builtin_add_overflow (exp_val, 0, &t))
return 0;
result = mktime (tm);
if (result == (time_t) -1)
FAIL_RET ("*** mktime failed: %m in line: %d", line);
if ((long long int) result != exp_val)
FAIL_RET ("*** Result different than expected (%lld != %lld) in %d\n",
(long long int) result, exp_val, line);
return 0;
}
static int
do_test (void)
{
struct tm t;
/* Use glibc time zone extension "TZ=:" to to guarantee that UTC
without leap seconds is used for the test. */
TEST_VERIFY_EXIT (setenv ("TZ", ":", 1) == 0);
/* Check that mktime (1970-01-01 00:00:00) returns 0. */
t = tm0;
test_mktime_helper (&t, 0, __LINE__);
/* Check that mktime (2038-01-19 03:14:07) returns 0x7FFFFFFF. */
t = tmY2038;
test_mktime_helper (&t, 0x7fffffff, __LINE__);
/* Check that mktime (2038-01-19 03:14:08) returns 0x80000000
(time_t overflow). */
t = tmY2038;
t.tm_sec++;
test_mktime_helper (&t, 0x80000000, __LINE__);
/* Check that mktime (2106-02-07 06:28:15) returns 0xFFFFFFFF. */
t = tm32bitmax;
test_mktime_helper (&t, 0xFFFFFFFF, __LINE__);
/* Check that mktime (2106-02-07 06:28:16) returns 0x100000000. */
t = tm32bitmax;
t.tm_sec++;
test_mktime_helper (&t, 0x100000000, __LINE__);
return 0;
}
#include <support/test-driver.c>
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