1 | /* Test for difftime |
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 <support/check.h> |
21 | |
22 | static void |
23 | test_difftime_helper (time_t t1, time_t t0, double exp_val) |
24 | { |
25 | double sub = difftime (time1: t1, time0: t0); |
26 | if (sub != exp_val) |
27 | FAIL_EXIT1 ("*** Difftime returned %f (expected %f)\n" , sub, exp_val); |
28 | } |
29 | |
30 | static int |
31 | do_test (void) |
32 | { |
33 | time_t t = 1383791700; /* Provide reproductible start value. */ |
34 | |
35 | /* Check if difftime works with current time. */ |
36 | test_difftime_helper (t1: t + 1800, t0: t - 1800, exp_val: 3600.0); |
37 | test_difftime_helper (t1: t - 1800, t0: t + 1800, exp_val: -3600.0); |
38 | |
39 | t = 0x7FFFFFFF; |
40 | /* Check if we run on port with 32 bit time_t size */ |
41 | time_t tov; |
42 | if (__builtin_add_overflow (t, 1, &tov)) |
43 | return 0; |
44 | |
45 | /* Check if the time is converted after 32 bit time_t overflow. */ |
46 | test_difftime_helper (t1: t + 1800, t0: t - 1800, exp_val: 3600.0); |
47 | test_difftime_helper (t1: t - 1800, t0: t + 1800, exp_val: -3600.0); |
48 | |
49 | t = tov; |
50 | test_difftime_helper (t1: t + 1800, t0: t - 1800, exp_val: 3600.0); |
51 | test_difftime_helper (t1: t - 1800, t0: t + 1800, exp_val: -3600.0); |
52 | |
53 | return 0; |
54 | } |
55 | |
56 | #include <support/test-driver.c> |
57 | |