1/* Test for ctime
2 Copyright (C) 2021-2022 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 <time.h>
20#include <stdlib.h>
21#include <support/check.h>
22
23static int
24do_test (void)
25{
26 char *str;
27 char strb[32];
28 time_t t;
29
30 /* Use glibc time zone extension "TZ=:" to to guarantee that UTC
31 without leap seconds is used for the test. */
32 TEST_VERIFY_EXIT (setenv ("TZ", ":", 1) == 0);
33 tzset ();
34
35 /* Check if the epoch time can be converted. */
36 t = 0;
37 str = ctime (timer: &t);
38 TEST_COMPARE_STRING (str, "Thu Jan 1 00:00:00 1970\n");
39
40 /* Same as before but with ctime_r. */
41 str = ctime_r (timer: &t, buf: strb);
42 TEST_VERIFY (str == strb);
43 TEST_COMPARE_STRING (str, "Thu Jan 1 00:00:00 1970\n");
44
45 /* Check if the max time value for 32 bit time_t can be converted. */
46 t = 0x7fffffff;
47 str = ctime (timer: &t);
48 TEST_COMPARE_STRING (str, "Tue Jan 19 03:14:07 2038\n");
49
50 /* Same as before but with ctime_r. */
51 str = ctime_r (timer: &t, buf: strb);
52 TEST_VERIFY (str == strb);
53 TEST_COMPARE_STRING (str, "Tue Jan 19 03:14:07 2038\n");
54
55 /* Check if we run on port with 32 bit time_t size */
56 time_t tov;
57 if (__builtin_add_overflow (t, 1, &tov))
58 return 0;
59
60 /* Check if the time is converted after 32 bit time_t overflow. */
61 str = ctime (timer: &tov);
62 TEST_COMPARE_STRING (str, "Tue Jan 19 03:14:08 2038\n");
63
64 /* Same as before but with ctime_r. */
65 str = ctime_r (timer: &tov, buf: strb);
66 TEST_VERIFY (str == strb);
67 TEST_COMPARE_STRING (str, "Tue Jan 19 03:14:08 2038\n");
68
69 return 0;
70}
71
72#include <support/test-driver.c>
73

source code of glibc/time/tst-ctime.c