1/* Basic tests for timegm.
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 void
24do_test_func (time_t (*func)(struct tm *))
25{
26 {
27 struct tm tmg =
28 {
29 .tm_sec = 0,
30 .tm_min = 0,
31 .tm_hour = 0,
32 .tm_mday = 1,
33 .tm_mon = 0,
34 .tm_year = 70,
35 .tm_wday = 4,
36 .tm_yday = 0,
37 .tm_isdst = 0
38 };
39 time_t t = func (&tmg);
40 TEST_COMPARE (t, 0);
41 }
42
43 {
44 struct tm tmg =
45 {
46 .tm_sec = 7,
47 .tm_min = 14,
48 .tm_hour = 3,
49 .tm_mday = 19,
50 .tm_mon = 0,
51 .tm_year = 138,
52 .tm_wday = 2,
53 .tm_yday = 18,
54 .tm_isdst = 0
55 };
56 time_t t = func (&tmg);
57 TEST_COMPARE (t, 0x7fffffff);
58 }
59
60 if (sizeof (time_t) < 8)
61 return;
62
63 {
64 struct tm tmg =
65 {
66 .tm_sec = 8,
67 .tm_min = 14,
68 .tm_hour = 3,
69 .tm_mday = 19,
70 .tm_mon = 0,
71 .tm_year = 138,
72 .tm_wday = 2,
73 .tm_yday = 18,
74 .tm_isdst = 0
75 };
76 time_t t = func (&tmg);
77 TEST_COMPARE (t, (time_t) 0x80000000ull);
78 }
79}
80
81static int
82do_test (void)
83{
84 do_test_func (func: timegm);
85
86 /* timelocal is an alias to mktime and behaves like timegm with the
87 difference that it takes timezone into account. */
88 TEST_VERIFY_EXIT (setenv ("TZ", ":", 1) == 0);
89 tzset ();
90 do_test_func (func: timelocal);
91
92 return 0;
93}
94
95#include <support/test-driver.c>
96

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