[07/15] time: Add gmtime/gmtime_r tests

  Checked on x86_64-linux-gnu and i686-linux-gnu.
---
 time/Makefile     |   2 +-
 time/tst-gmtime.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 126 insertions(+), 1 deletion(-)
 create mode 100644 time/tst-gmtime.c
  

On 3/23/21 7:14 PM, Adhemerval Zanella via Libc-alpha wrote:
> Checked on x86_64-linux-gnu and i686-linux-gnu.
> ---

LGTM with a small nit fixed below.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>


>   time/Makefile     |   2 +-
>   time/tst-gmtime.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++
>   2 files changed, 126 insertions(+), 1 deletion(-)
>   create mode 100644 time/tst-gmtime.c
> 
> diff --git a/time/Makefile b/time/Makefile
> index 91cb02a003..a503297527 100644
> --- a/time/Makefile
> +++ b/time/Makefile
> @@ -49,7 +49,7 @@ tests	:= test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
>   	   tst-tzname tst-y2039 bug-mktime4 tst-strftime2 tst-strftime3 \
>   	   tst-clock tst-clock2 tst-clock_nanosleep tst-cpuclock1 \
>   	   tst-adjtime tst-ctime tst-difftime tst-mktime4 tst-clock_settime \
> -	   tst-settimeofday tst-itimer
> +	   tst-settimeofday tst-itimer tst-gmtime
>   
>   include ../Rules
>   
> diff --git a/time/tst-gmtime.c b/time/tst-gmtime.c
> new file mode 100644
> index 0000000000..4d09cade79
> --- /dev/null
> +++ b/time/tst-gmtime.c
> @@ -0,0 +1,125 @@
> +/* Basic tests for gmtime.
> +   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)
> +{
> +  /* Check if the epoch time can be converted.  */
> +  {
> +    time_t t = 0;
> +    struct tm *tmg = gmtime (&t);
> +    TEST_COMPARE (tmg->tm_sec,   0);
> +    TEST_COMPARE (tmg->tm_min,   0);
> +    TEST_COMPARE (tmg->tm_hour,  0);
> +    TEST_COMPARE (tmg->tm_mday,  1);
> +    TEST_COMPARE (tmg->tm_mon,   0);
> +    TEST_COMPARE (tmg->tm_year,  70);
> +    TEST_COMPARE (tmg->tm_wday,  4);
> +    TEST_COMPARE (tmg->tm_yday,  0);
> +    TEST_COMPARE (tmg->tm_isdst, 0);
> +  }
> +  {
> +    /* Same as before but with gmtime_r.  */
> +    time_t t = 0;
> +    struct tm tms;
> +    struct tm *tmg = gmtime_r (&t, &tms);
> +    TEST_VERIFY (tmg == &tms);
> +    TEST_COMPARE (tmg->tm_year, 70);

Duplicated check?

> +    TEST_COMPARE (tmg->tm_sec,   0);
> +    TEST_COMPARE (tmg->tm_min,   0);
> +    TEST_COMPARE (tmg->tm_hour,  0);
> +    TEST_COMPARE (tmg->tm_mday,  1);
> +    TEST_COMPARE (tmg->tm_mon,   0);
> +    TEST_COMPARE (tmg->tm_year,  70);
> +    TEST_COMPARE (tmg->tm_wday,  4);
> +    TEST_COMPARE (tmg->tm_yday,  0);
> +    TEST_COMPARE (tmg->tm_isdst, 0);
> +  }
> +
> +  /* Check if the max time value for 32 bit time_t can be converted.  */
> +  {
> +    time_t t = 0x7fffffff;
> +    struct tm *tmg = gmtime (&t);
> +    TEST_COMPARE (tmg->tm_sec,   7);
> +    TEST_COMPARE (tmg->tm_min,   14);
> +    TEST_COMPARE (tmg->tm_hour,  3);
> +    TEST_COMPARE (tmg->tm_mday,  19);
> +    TEST_COMPARE (tmg->tm_mon,   0);
> +    TEST_COMPARE (tmg->tm_year,  138);
> +    TEST_COMPARE (tmg->tm_wday,  2);
> +    TEST_COMPARE (tmg->tm_yday,  18);
> +    TEST_COMPARE (tmg->tm_isdst, 0);
> +  }
> +  {
> +    /* Same as before but with ctime_r.  */
> +    time_t t = 0x7fffffff;
> +    struct tm tms;
> +    struct tm *tmg = gmtime_r (&t, &tms);
> +    TEST_VERIFY (tmg == &tms);
> +    TEST_COMPARE (tmg->tm_sec,   7);
> +    TEST_COMPARE (tmg->tm_min,   14);
> +    TEST_COMPARE (tmg->tm_hour,  3);
> +    TEST_COMPARE (tmg->tm_mday,  19);
> +    TEST_COMPARE (tmg->tm_mon,   0);
> +    TEST_COMPARE (tmg->tm_year,  138);
> +    TEST_COMPARE (tmg->tm_wday,  2);
> +    TEST_COMPARE (tmg->tm_yday,  18);
> +    TEST_COMPARE (tmg->tm_isdst, 0);
> +  }
> +
> +  if (sizeof (time_t) < 8)
> +    return 0;
> +
> +  {
> +    time_t t = (time_t) 0x80000000ull;
> +    struct tm *tmg = gmtime (&t);
> +    TEST_COMPARE (tmg->tm_sec,   8);
> +    TEST_COMPARE (tmg->tm_min,   14);
> +    TEST_COMPARE (tmg->tm_hour,  3);
> +    TEST_COMPARE (tmg->tm_mday,  19);
> +    TEST_COMPARE (tmg->tm_mon,   0);
> +    TEST_COMPARE (tmg->tm_year,  138);
> +    TEST_COMPARE (tmg->tm_wday,  2);
> +    TEST_COMPARE (tmg->tm_yday,  18);
> +    TEST_COMPARE (tmg->tm_isdst, 0);
> +  }
> +
> +  {
> +    time_t t = (time_t) 0x80000000ull;
> +    struct tm tms;
> +    struct tm *tmg = gmtime_r (&t, &tms);
> +    TEST_VERIFY (tmg == &tms);
> +    TEST_COMPARE (tmg->tm_sec,   8);
> +    TEST_COMPARE (tmg->tm_min,   14);
> +    TEST_COMPARE (tmg->tm_hour,  3);
> +    TEST_COMPARE (tmg->tm_mday,  19);
> +    TEST_COMPARE (tmg->tm_mon,   0);
> +    TEST_COMPARE (tmg->tm_year,  138);
> +    TEST_COMPARE (tmg->tm_wday,  2);
> +    TEST_COMPARE (tmg->tm_yday,  18);
> +    TEST_COMPARE (tmg->tm_isdst, 0);
> +  }
> +
> +  return 0;
> +}
> +
> +#include <support/test-driver.c>
>