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tst: Provide test for ctime

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This change adds new test to assess ctime's functionality.

To be more specific - following use cases are checked:
- Pass time_t value as 0 to check if epoch time is converted
- Pass time_t as max value for 32 bit systems
- Pass time_t as the first value after Y2038 threshold

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Lukasz Majewski 2021-01-21 09:33:34 +01:00
parent 2323a34260
commit 0ca1a95d3b
2 changed files with 57 additions and 1 deletions
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2
time/Makefile
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@ -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-adjtime tst-ctime
include ../Rules

56
time/tst-ctime.c Normal file
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@ -0,0 +1,56 @@
/* Test for ctime
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 <stdlib.h>
#include <support/check.h>
static int
do_test (void)
{
char *str;
time_t t;
/* Use glibc time zone extension "TZ=:" to to guarantee that UTC
without leap seconds is used for the test. */
TEST_VERIFY_EXIT (setenv ("TZ", ":", 1) == 0);
tzset ();
/* Check if the epoch time can be converted. */
t = 0;
str = ctime (&t);
TEST_COMPARE_STRING (str, "Thu Jan 1 00:00:00 1970\n");
/* Check if the max time value for 32 bit time_t can be converted. */
t = 0x7fffffff;
str = ctime (&t);
TEST_COMPARE_STRING (str, "Tue Jan 19 03:14:07 2038\n");
/* 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. */
str = ctime (&tov);
TEST_COMPARE_STRING (str, "Tue Jan 19 03:14:08 2038\n");
return 0;
}
#include <support/test-driver.c>