From: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
To: Andreas Schwab <schwab@suse.de>, libc-alpha@sourceware.org
Subject: Re: [PATCH] Use 64-bit time_t interfaces in strftime and strptime (bug 30053)
Date: Thu, 26 Jan 2023 10:47:28 -0300 [thread overview]
Message-ID: <1d6daa89-fbec-461c-8423-eb785f89d4ab@linaro.org> (raw)
In-Reply-To: <mvmr0vhto02.fsf@suse.de>
On 26/01/23 10:38, Andreas Schwab via Libc-alpha wrote:
> Both functions use time_t only internally, so the ABI is not affected.
> ---
> time/Makefile | 3 ++-
> time/strftime_l.c | 4 ++++
> time/strptime_l.c | 4 +++-
> time/tst-y2038-time64.c | 1 +
> time/tst-y2038.c | 52 +++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 62 insertions(+), 2 deletions(-)
> create mode 100644 time/tst-y2038-time64.c
> create mode 100644 time/tst-y2038.c
>
> diff --git a/time/Makefile b/time/Makefile
> index d86f2105c5..8b2e1d2398 100644
> --- a/time/Makefile
> +++ b/time/Makefile
> @@ -50,7 +50,7 @@ tests := test_time clocktest tst-posixtz tst-strptime tst_wcsftime \
> 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-gmtime tst-timegm \
> - tst-timespec_get tst-timespec_getres
> + tst-timespec_get tst-timespec_getres tst-y2038
>
> tests-time64 := \
> tst-adjtime-time64 \
> @@ -68,6 +68,7 @@ tests-time64 := \
> tst-timegm-time64 \
> tst-timespec_get-time64 \
> tst-timespec_getres-time64 \
> + tst-y2038-time64 \
I think it should be renamed to tst-strftime4-time64 to show it is testing
strftime. The rest of the patch looks ok.
> tst-y2039-time64
>
> include ../Rules
> diff --git a/time/strftime_l.c b/time/strftime_l.c
> index e09561c39c..402c6c4111 100644
> --- a/time/strftime_l.c
> +++ b/time/strftime_l.c
> @@ -159,6 +159,10 @@ extern char *tzname[];
> #ifdef _LIBC
> # define tzname __tzname
> # define tzset __tzset
> +
> +# define time_t __time64_t
> +# define __gmtime_r(t, tp) __gmtime64_r (t, tp)
> +# define mktime(tp) __mktime64 (tp)
> #endif
>
> #if !HAVE_TM_GMTOFF
> diff --git a/time/strptime_l.c b/time/strptime_l.c
> index 80fd705b8d..85c3249fcc 100644
> --- a/time/strptime_l.c
> +++ b/time/strptime_l.c
> @@ -30,8 +30,10 @@
> #ifdef _LIBC
> # define HAVE_LOCALTIME_R 0
> # include "../locale/localeinfo.h"
> -#endif
>
> +# define time_t __time64_t
> +# define __localtime_r(t, tp) __localtime64_r (t, tp)
> +#endif
>
> #if ! HAVE_LOCALTIME_R && ! defined localtime_r
> # ifdef _LIBC
> diff --git a/time/tst-y2038-time64.c b/time/tst-y2038-time64.c
> new file mode 100644
> index 0000000000..d6482b0be9
> --- /dev/null
> +++ b/time/tst-y2038-time64.c
> @@ -0,0 +1 @@
> +#include "tst-y2038.c"
> diff --git a/time/tst-y2038.c b/time/tst-y2038.c
> new file mode 100644
> index 0000000000..659716d0fa
> --- /dev/null
> +++ b/time/tst-y2038.c
> @@ -0,0 +1,52 @@
> +/* Test strftime and strptime after 2038-01-19 03:14:07 UTC (bug 30053).
> + Copyright (C) 2023 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 <stdio.h>
> +#include <string.h>
> +#include <support/check.h>
> +
> +static int
> +do_test (void)
> +{
> + TEST_VERIFY_EXIT (setenv ("TZ", "UTC0", 1) == 0);
> + tzset ();
> + if (sizeof (time_t) > 4)
> + {
> + time_t wrap = (time_t) 2147483648LL;
> + char buf[80];
> + struct tm *tm = gmtime (&wrap);
> + TEST_VERIFY_EXIT (tm != NULL);
> + TEST_VERIFY_EXIT (strftime (buf, sizeof buf, "%s", tm) > 0);
> + puts (buf);
> + TEST_VERIFY (strcmp (buf, "2147483648") == 0);
> +
> + struct tm tm2;
> + char *p = strptime (buf, "%s", &tm2);
> + TEST_VERIFY_EXIT (p != NULL && *p == '\0');
> + time_t t = mktime (&tm2);
> + printf ("%lld\n", (long long) t);
> + TEST_VERIFY (t == wrap);
> + }
> + else
> + FAIL_UNSUPPORTED ("32-bit time_t");
> + return 0;
> +}
> +
> +#include <support/test-driver.c>
next prev parent reply other threads:[~2023-01-26 13:47 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-26 13:38 Andreas Schwab
2023-01-26 13:47 ` Adhemerval Zanella Netto [this message]
2023-01-26 14:05 ` Andreas Schwab
2023-01-26 14:25 ` Adhemerval Zanella Netto
2023-01-26 14:36 ` Andreas Schwab
2023-01-26 15:26 ` Adhemerval Zanella Netto
2023-02-06 20:33 ` Fangrui Song
2023-02-06 14:31 Andreas Schwab
2023-02-06 20:09 ` Paul Eggert
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