time/tst-strftime4.c

   1 /* Test strftime and strptime after 2038-01-19 03:14:07 UTC (bug 30053).
   2    Copyright (C) 2023-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <time.h>
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <support/check.h>
  24
  25 static int
  26 do_test (void)
  27 {
  28   TEST_VERIFY_EXIT (setenv ("TZ", "UTC0", 1) == 0);
  29   tzset ();
  30   if (sizeof (time_t) > 4)
  31     {
  32       time_t wrap = (time_t) 2147483648LL;
  33       char buf[80];
  34       struct tm *tm = gmtime (&wrap);
  35       TEST_VERIFY_EXIT (tm != NULL);
  36       TEST_VERIFY_EXIT (strftime (buf, sizeof buf, "%s", tm) > 0);
  37       puts (buf);
  38       TEST_VERIFY (strcmp (buf, "2147483648") == 0);
  39
  40       struct tm tm2;
  41       char *p = strptime (buf, "%s", &tm2);
  42       TEST_VERIFY_EXIT (p != NULL && *p == '\0');
  43       time_t t = mktime (&tm2);
  44       printf ("%lld\n", (long long) t);
  45       TEST_VERIFY (t == wrap);
  46     }
  47   else
  48     FAIL_UNSUPPORTED ("32-bit time_t");
  49   return 0;
  50 }
  51
  52 #include <support/test-driver.c>