time/tst-y2039.c

   1 /* Test for localtime bug in year 2039 (bug 22639).
   2    Copyright (C) 2017-2024 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", "PST8PDT,M3.2.0,M11.1.0", 1) == 0);
  29   tzset ();
  30   if (sizeof (time_t) > 4)
  31     {
  32       time_t ouch = (time_t) 2187810000LL;
  33       char buf[500];
  34       struct tm *tm = localtime (&ouch);
  35       TEST_VERIFY_EXIT (tm != NULL);
  36       TEST_VERIFY_EXIT (strftime (buf, sizeof buf, "%Y-%m-%d %H:%M:%S %Z", tm)
  37                         > 0);
  38       puts (buf);
  39       TEST_VERIFY (strcmp (buf, "2039-04-30 14:00:00 PDT") == 0);
  40
  41       /* Same as before but for localtime_r.  */
  42       struct tm tmd;
  43       tm = localtime_r (&ouch, &tmd);
  44       TEST_VERIFY_EXIT (tm == &tmd);
  45
  46       TEST_VERIFY_EXIT (strftime (buf, sizeof buf, "%Y-%m-%d %H:%M:%S %Z", tm)
  47                         > 0);
  48       puts (buf);
  49       TEST_VERIFY (strcmp (buf, "2039-04-30 14:00:00 PDT") == 0);
  50     }
  51   else
  52     FAIL_UNSUPPORTED ("32-bit time_t");
  53   return 0;
  54 }
  55
  56 #include <support/test-driver.c>