time/tst-gmtime.c

   1 /* Basic tests for gmtime.
   2    Copyright (C) 2021-2024 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 <support/check.h>
  22
  23 static int
  24 do_test (void)
  25 {
  26   /* Check if the epoch time can be converted.  */
  27   {
  28     time_t t = 0;
  29     struct tm *tmg = gmtime (&t);
  30     TEST_COMPARE (tmg->tm_sec,   0);
  31     TEST_COMPARE (tmg->tm_min,   0);
  32     TEST_COMPARE (tmg->tm_hour,  0);
  33     TEST_COMPARE (tmg->tm_mday,  1);
  34     TEST_COMPARE (tmg->tm_mon,   0);
  35     TEST_COMPARE (tmg->tm_year,  70);
  36     TEST_COMPARE (tmg->tm_wday,  4);
  37     TEST_COMPARE (tmg->tm_yday,  0);
  38     TEST_COMPARE (tmg->tm_isdst, 0);
  39   }
  40   {
  41     /* Same as before but with gmtime_r.  */
  42     time_t t = 0;
  43     struct tm tms;
  44     struct tm *tmg = gmtime_r (&t, &tms);
  45     TEST_VERIFY (tmg == &tms);
  46     TEST_COMPARE (tmg->tm_sec,   0);
  47     TEST_COMPARE (tmg->tm_min,   0);
  48     TEST_COMPARE (tmg->tm_hour,  0);
  49     TEST_COMPARE (tmg->tm_mday,  1);
  50     TEST_COMPARE (tmg->tm_mon,   0);
  51     TEST_COMPARE (tmg->tm_year,  70);
  52     TEST_COMPARE (tmg->tm_wday,  4);
  53     TEST_COMPARE (tmg->tm_yday,  0);
  54     TEST_COMPARE (tmg->tm_isdst, 0);
  55   }
  56
  57   /* Check if the max time value for 32 bit time_t can be converted.  */
  58   {
  59     time_t t = 0x7fffffff;
  60     struct tm *tmg = gmtime (&t);
  61     TEST_COMPARE (tmg->tm_sec,   7);
  62     TEST_COMPARE (tmg->tm_min,   14);
  63     TEST_COMPARE (tmg->tm_hour,  3);
  64     TEST_COMPARE (tmg->tm_mday,  19);
  65     TEST_COMPARE (tmg->tm_mon,   0);
  66     TEST_COMPARE (tmg->tm_year,  138);
  67     TEST_COMPARE (tmg->tm_wday,  2);
  68     TEST_COMPARE (tmg->tm_yday,  18);
  69     TEST_COMPARE (tmg->tm_isdst, 0);
  70   }
  71   {
  72     /* Same as before but with ctime_r.  */
  73     time_t t = 0x7fffffff;
  74     struct tm tms;
  75     struct tm *tmg = gmtime_r (&t, &tms);
  76     TEST_VERIFY (tmg == &tms);
  77     TEST_COMPARE (tmg->tm_sec,   7);
  78     TEST_COMPARE (tmg->tm_min,   14);
  79     TEST_COMPARE (tmg->tm_hour,  3);
  80     TEST_COMPARE (tmg->tm_mday,  19);
  81     TEST_COMPARE (tmg->tm_mon,   0);
  82     TEST_COMPARE (tmg->tm_year,  138);
  83     TEST_COMPARE (tmg->tm_wday,  2);
  84     TEST_COMPARE (tmg->tm_yday,  18);
  85     TEST_COMPARE (tmg->tm_isdst, 0);
  86   }
  87
  88   if (sizeof (time_t) < 8)
  89     return 0;
  90
  91   {
  92     time_t t = (time_t) 0x80000000ull;
  93     struct tm *tmg = gmtime (&t);
  94     TEST_COMPARE (tmg->tm_sec,   8);
  95     TEST_COMPARE (tmg->tm_min,   14);
  96     TEST_COMPARE (tmg->tm_hour,  3);
  97     TEST_COMPARE (tmg->tm_mday,  19);
  98     TEST_COMPARE (tmg->tm_mon,   0);
  99     TEST_COMPARE (tmg->tm_year,  138);
 100     TEST_COMPARE (tmg->tm_wday,  2);
 101     TEST_COMPARE (tmg->tm_yday,  18);
 102     TEST_COMPARE (tmg->tm_isdst, 0);
 103   }
 104
 105   {
 106     time_t t = (time_t) 0x80000000ull;
 107     struct tm tms;
 108     struct tm *tmg = gmtime_r (&t, &tms);
 109     TEST_VERIFY (tmg == &tms);
 110     TEST_COMPARE (tmg->tm_sec,   8);
 111     TEST_COMPARE (tmg->tm_min,   14);
 112     TEST_COMPARE (tmg->tm_hour,  3);
 113     TEST_COMPARE (tmg->tm_mday,  19);
 114     TEST_COMPARE (tmg->tm_mon,   0);
 115     TEST_COMPARE (tmg->tm_year,  138);
 116     TEST_COMPARE (tmg->tm_wday,  2);
 117     TEST_COMPARE (tmg->tm_yday,  18);
 118     TEST_COMPARE (tmg->tm_isdst, 0);
 119   }
 120
 121   return 0;
 122 }
 123
 124 #include <support/test-driver.c>