[v4] tst: Provide test for ctime

  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

---
Changes for v2:
- Add setting of TZ env variable

Changes for v3:
- Remove FAIL_UNSUPPORTED() when sizeof (time_t) <= 4
- Use "TZ=:" glibc extension to guarantee UTC time zone

Changes for v4:
- Use __builtin_add_overflow instead of sizeof (time_t) > 4 to check
  if time_t has overflowed.
---
 time/Makefile    |  2 +-
 time/tst-ctime.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 time/tst-ctime.c
  

Dear Community,

> 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
> 
> ---
> Changes for v2:
> - Add setting of TZ env variable
> 
> Changes for v3:
> - Remove FAIL_UNSUPPORTED() when sizeof (time_t) <= 4
> - Use "TZ=:" glibc extension to guarantee UTC time zone
> 
> Changes for v4:
> - Use __builtin_add_overflow instead of sizeof (time_t) > 4 to check
>   if time_t has overflowed.

Are there any more comments regarding this test? Is it eligible for
pulling?

> ---
>  time/Makefile    |  2 +-
>  time/tst-ctime.c | 56
> ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 57
> insertions(+), 1 deletion(-) create mode 100644 time/tst-ctime.c
> 
> diff --git a/time/Makefile b/time/Makefile
> index 43e5821adc..486fb02ecb 100644
> --- a/time/Makefile
> +++ b/time/Makefile
> @@ -51,7 +51,7 @@ tests	:= test_time clocktest tst-posixtz
> tst-strptime tst_wcsftime \ tst-clock tst-clock2 tst-clock_nanosleep
> tst-cpuclock1 \ tst-adjtime tst-clock-y2038 tst-clock2-y2038 \
>  	   tst-cpuclock1-y2038 tst-clock_nanosleep-y2038
> tst-clock_settime \
> -	   tst-clock_adjtime
> +	   tst-clock_adjtime tst-ctime
>  
>  include ../Rules
>  
> diff --git a/time/tst-ctime.c b/time/tst-ctime.c
> new file mode 100644
> index 0000000000..e89a906bf8
> --- /dev/null
> +++ b/time/tst-ctime.c
> @@ -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>




Best regards,

Lukasz Majewski

--

DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
  

On 05/02/2021 08:46, Lukasz Majewski wrote:
> 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
> 
> ---
> Changes for v2:
> - Add setting of TZ env variable
> 
> Changes for v3:
> - Remove FAIL_UNSUPPORTED() when sizeof (time_t) <= 4
> - Use "TZ=:" glibc extension to guarantee UTC time zone
> 
> Changes for v4:
> - Use __builtin_add_overflow instead of sizeof (time_t) > 4 to check
>   if time_t has overflowed.

LGTM, thanks.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

> ---
>  time/Makefile    |  2 +-
>  time/tst-ctime.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 57 insertions(+), 1 deletion(-)
>  create mode 100644 time/tst-ctime.c
> 
> diff --git a/time/Makefile b/time/Makefile
> index 43e5821adc..486fb02ecb 100644
> --- a/time/Makefile
> +++ b/time/Makefile
> @@ -51,7 +51,7 @@ tests	:= test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
>  	   tst-clock tst-clock2 tst-clock_nanosleep tst-cpuclock1 \
>  	   tst-adjtime tst-clock-y2038 tst-clock2-y2038 \
>  	   tst-cpuclock1-y2038 tst-clock_nanosleep-y2038 tst-clock_settime \
> -	   tst-clock_adjtime
> +	   tst-clock_adjtime tst-ctime
>  
>  include ../Rules
>  

Ok.

> diff --git a/time/tst-ctime.c b/time/tst-ctime.c
> new file mode 100644
> index 0000000000..e89a906bf8
> --- /dev/null
> +++ b/time/tst-ctime.c
> @@ -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>
> 

Ok.