time/tst-timegm.c

   1 /* Basic tests for timegm.
   2    Copyright (C) 2021-2023 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 <support/check.h>
  22
  23 static void
  24 do_test_func (time_t (*func)(struct tm *))
  25 {
  26   {
  27     struct tm tmg =
  28       {
  29         .tm_sec = 0,
  30         .tm_min = 0,
  31         .tm_hour = 0,
  32         .tm_mday = 1,
  33         .tm_mon = 0,
  34         .tm_year = 70,
  35         .tm_wday = 4,
  36         .tm_yday = 0,
  37         .tm_isdst = 0
  38      };
  39      time_t t = func (&tmg);
  40      TEST_COMPARE (t, 0);
  41   }
  42
  43   {
  44     struct tm tmg =
  45       {
  46         .tm_sec = 7,
  47         .tm_min = 14,
  48         .tm_hour = 3,
  49         .tm_mday = 19,
  50         .tm_mon = 0,
  51         .tm_year = 138,
  52         .tm_wday = 2,
  53         .tm_yday = 18,
  54         .tm_isdst = 0
  55      };
  56      time_t t = func (&tmg);
  57      TEST_COMPARE (t, 0x7fffffff);
  58   }
  59
  60   if (sizeof (time_t) < 8)
  61     return;
  62
  63   {
  64     struct tm tmg =
  65       {
  66         .tm_sec = 8,
  67         .tm_min = 14,
  68         .tm_hour = 3,
  69         .tm_mday = 19,
  70         .tm_mon = 0,
  71         .tm_year = 138,
  72         .tm_wday = 2,
  73         .tm_yday = 18,
  74         .tm_isdst = 0
  75      };
  76      time_t t = func (&tmg);
  77      TEST_COMPARE (t, (time_t) 0x80000000ull);
  78   }
  79 }
  80
  81 static int
  82 do_test (void)
  83 {
  84   do_test_func (timegm);
  85
  86   /* timelocal is an alias to mktime and behaves like timegm with the
  87      difference that it takes timezone into account.  */
  88   TEST_VERIFY_EXIT (setenv ("TZ", ":", 1) == 0);
  89   tzset ();
  90   do_test_func (timelocal);
  91
  92   return 0;
  93 }
  94
  95 #include <support/test-driver.c>