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13c0b30b24
This change adds new test to assess difftime's functionality by adding some arbitrary offsets to current time_t value (read via time). If 64 bit time_t is supported, the same procedure is applied around the threshold of Y2038 time overflow. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/* Test for difftime
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <time.h>
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#include <support/check.h>
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static void
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test_difftime_helper (time_t t1, time_t t0, double exp_val)
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{
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double sub = difftime (t1, t0);
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if (sub != exp_val)
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FAIL_EXIT1 ("*** Difftime returned %f (expected %f)\n", sub, exp_val);
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}
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static int
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do_test (void)
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{
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time_t t = 1383791700; /* Provide reproductible start value. */
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/* Check if difftime works with current time. */
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test_difftime_helper (t + 1800, t - 1800, 3600.0);
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test_difftime_helper (t - 1800, t + 1800, -3600.0);
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t = 0x7FFFFFFF;
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/* Check if we run on port with 32 bit time_t size */
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time_t tov;
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if (__builtin_add_overflow (t, 1, &tov))
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return 0;
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/* Check if the time is converted after 32 bit time_t overflow. */
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test_difftime_helper (t + 1800, t - 1800, 3600.0);
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test_difftime_helper (t - 1800, t + 1800, -3600.0);
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t = tov;
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test_difftime_helper (t + 1800, t - 1800, 3600.0);
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test_difftime_helper (t - 1800, t + 1800, -3600.0);
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return 0;
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}
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#include <support/test-driver.c>
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