1  /* Test strftime and strptime after 2038-01-19 03:14:07 UTC (bug 30053).
       2     Copyright (C) 2023 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>