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 |
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 |
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 (tm: &t, exp_val: 0, __LINE__); |
86 | |
87 | /* Check that mktime (2038-01-19 03:14:07) returns 0x7FFFFFFF. */ |
88 | t = tmY2038; |
89 | test_mktime_helper (tm: &t, exp_val: 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 (tm: &t, exp_val: 0x80000000, __LINE__); |
96 | |
97 | /* Check that mktime (2106-02-07 06:28:15) returns 0xFFFFFFFF. */ |
98 | t = tm32bitmax; |
99 | test_mktime_helper (tm: &t, exp_val: 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 (tm: &t, exp_val: 0x100000000, __LINE__); |
105 | |
106 | return 0; |
107 | } |
108 | |
109 | #include <support/test-driver.c> |
110 | |