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authorLukasz Majewski <lukma@denx.de>2021-01-25 12:51:41 +0100
committerLukasz Majewski <lukma@denx.de>2021-02-16 20:37:27 +0100
commit13c0b30b24b1f7c6853cb8a3317568cb960efe99 (patch)
treef16404ce9731437449545c106cbf104ea1dfdaa9 /time
parent0ca1a95d3b6249b3ac4101e6d781c7e4380c47e0 (diff)
downloadglibc-13c0b30b24b1f7c6853cb8a3317568cb960efe99.tar.gz
tst: Provide test for difftime
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>
Diffstat (limited to 'time')
-rw-r--r--time/Makefile2
-rw-r--r--time/tst-difftime.c56
2 files changed, 57 insertions, 1 deletions
diff --git a/time/Makefile b/time/Makefile
index 2dd70111b5..7caec2b271 100644
--- a/time/Makefile
+++ b/time/Makefile
@@ -48,7 +48,7 @@ tests := test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
tst-strptime3 bug-getdate1 tst-strptime-whitespace tst-ftime \
tst-tzname tst-y2039 bug-mktime4 tst-strftime2 tst-strftime3 \
tst-clock tst-clock2 tst-clock_nanosleep tst-cpuclock1 \
- tst-adjtime tst-ctime
+ tst-adjtime tst-ctime tst-difftime
include ../Rules
diff --git a/time/tst-difftime.c b/time/tst-difftime.c
new file mode 100644
index 0000000000..262f3d1db7
--- /dev/null
+++ b/time/tst-difftime.c
@@ -0,0 +1,56 @@
+/* Test for difftime
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <time.h>
+#include <support/check.h>
+
+static void
+test_difftime_helper (time_t t1, time_t t0, double exp_val)
+{
+ double sub = difftime (t1, t0);
+ if (sub != exp_val)
+ FAIL_EXIT1 ("*** Difftime returned %f (expected %f)\n", sub, exp_val);
+}
+
+static int
+do_test (void)
+{
+ time_t t = 1383791700; /* Provide reproductible start value. */
+
+ /* Check if difftime works with current time. */
+ test_difftime_helper (t + 1800, t - 1800, 3600.0);
+ test_difftime_helper (t - 1800, t + 1800, -3600.0);
+
+ t = 0x7FFFFFFF;
+ /* Check if we run on port with 32 bit time_t size */
+ time_t tov;
+ if (__builtin_add_overflow (t, 1, &tov))
+ return 0;
+
+ /* Check if the time is converted after 32 bit time_t overflow. */
+ test_difftime_helper (t + 1800, t - 1800, 3600.0);
+ test_difftime_helper (t - 1800, t + 1800, -3600.0);
+
+ t = tov;
+ test_difftime_helper (t + 1800, t - 1800, 3600.0);
+ test_difftime_helper (t - 1800, t + 1800, -3600.0);
+
+ return 0;
+}
+
+#include <support/test-driver.c>