1 /* Test for mktime (4)
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
23 const struct tm tm0 =
24 {
25 .tm_year = 70,
26 .tm_mon = 0,
27 .tm_mday = 1,
28 .tm_hour = 0,
29 .tm_min = 0,
30 .tm_sec = 0,
31 .tm_wday = 4,
32 .tm_yday = 0,
33 };
34
35 const struct tm tmY2038 =
36 {
37 .tm_year = 138,
38 .tm_mon = 0,
39 .tm_mday = 19,
40 .tm_hour = 3,
41 .tm_min = 14,
42 .tm_sec = 7,
43 };
44
45 const struct tm tm32bitmax =
46 {
47 .tm_year = 206,
48 .tm_mon = 1,
49 .tm_mday = 7,
50 .tm_hour = 6,
51 .tm_min = 28,
52 .tm_sec = 15,
53 };
54
55 static
test_mktime_helper(struct tm * tm,long long int exp_val,int line)56 int test_mktime_helper (struct tm *tm, long long int exp_val, int line)
57 {
58 time_t result, t;
59
60 /* Check if we run on port with 32 bit time_t size. */
61 if (__builtin_add_overflow (exp_val, 0, &t))
62 return 0;
63
64 result = mktime (tm);
65 if (result == (time_t) -1)
66 FAIL_RET ("*** mktime failed: %m in line: %d", line);
67
68 if ((long long int) result != exp_val)
69 FAIL_RET ("*** Result different than expected (%lld != %lld) in %d\n",
70 (long long int) result, exp_val, line);
71
72 return 0;
73 }
74
75 static int
do_test(void)76 do_test (void)
77 {
78 struct tm t;
79 /* Use glibc time zone extension "TZ=:" to to guarantee that UTC
80 without leap seconds is used for the test. */
81 TEST_VERIFY_EXIT (setenv ("TZ", ":", 1) == 0);
82
83 /* Check that mktime (1970-01-01 00:00:00) returns 0. */
84 t = tm0;
85 test_mktime_helper (&t, 0, __LINE__);
86
87 /* Check that mktime (2038-01-19 03:14:07) returns 0x7FFFFFFF. */
88 t = tmY2038;
89 test_mktime_helper (&t, 0x7fffffff, __LINE__);
90
91 /* Check that mktime (2038-01-19 03:14:08) returns 0x80000000
92 (time_t overflow). */
93 t = tmY2038;
94 t.tm_sec++;
95 test_mktime_helper (&t, 0x80000000, __LINE__);
96
97 /* Check that mktime (2106-02-07 06:28:15) returns 0xFFFFFFFF. */
98 t = tm32bitmax;
99 test_mktime_helper (&t, 0xFFFFFFFF, __LINE__);
100
101 /* Check that mktime (2106-02-07 06:28:16) returns 0x100000000. */
102 t = tm32bitmax;
103 t.tm_sec++;
104 test_mktime_helper (&t, 0x100000000, __LINE__);
105
106 return 0;
107 }
108
109 #include <support/test-driver.c>
110