tests/test-localtime_r.c

   1 /* Test localtime_r().
   2    Copyright (C) 2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2024.  */
  18
  19 #include <config.h>
  20
  21 /* Specification.  */
  22 #include <time.h>
  23
  24 #include <string.h>
  25
  26 #include "macros.h"
  27
  28
  29 /* Some common time zone name.  */
  30
  31 #if defined _WIN32 && !defined __CYGWIN__
  32 /* Cf. <https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/default-time-zones>
  33    or <https://ss64.com/timezones.html>  */
  34 # define FRENCH_TZ  "Romance Standard Time"
  35 #else
  36 /* Cf. <https://en.wikipedia.org/wiki/List_of_tz_database_time_zones>  */
  37 # define FRENCH_TZ  "Europe/Paris"
  38 #endif
  39
  40
  41 int
  42 main (void)
  43 {
  44   setenv ("TZ", FRENCH_TZ, 1);
  45
  46   /* Check that this TZ works.  */
  47   {
  48     time_t t = 0; /* 1970-01-01 01:00:00 */
  49     struct tm *result = localtime (&t);
  50     if (! (result
  51            && result->tm_sec == 0
  52            && result->tm_min == 0
  53            && result->tm_hour == 1
  54            && result->tm_mday == 1
  55            && result->tm_mon == 1 - 1
  56            && result->tm_year == 1970 - 1900
  57            && result->tm_wday == 4
  58            && result->tm_yday == 0
  59            && result->tm_isdst == 0))
  60       {
  61         fputs ("Skipping test: TZ='" FRENCH_TZ "' is not Paris time\n",
  62                stderr);
  63         return 77;
  64       }
  65   }
  66
  67   /* Note: The result->tm_gmtoff values and the result->tm_zone values are the
  68      same (3600, "CET" or 7200, "CEST") across all tested platforms:
  69      glibc, musl, macOS, FreeBSD, NetBSD, OpenBSD, Minix, Cygwin, Android.  */
  70
  71   /* A time point when DST was in effect.  */
  72   {
  73     time_t t = 1178467200; /* 2007-05-06 18:00:00 */
  74     struct tm tm;
  75     struct tm *result = localtime_r (&t, &tm);
  76     ASSERT (result == &tm);
  77     ASSERT (result->tm_sec == 0);
  78     ASSERT (result->tm_min == 0);
  79     ASSERT (result->tm_hour == 18);
  80     ASSERT (result->tm_mday == 6);
  81     ASSERT (result->tm_mon == 5 - 1);
  82     ASSERT (result->tm_year == 2007 - 1900);
  83     ASSERT (result->tm_wday == 0);
  84     ASSERT (result->tm_yday == 125);
  85     ASSERT (result->tm_isdst == 1);
  86 #if HAVE_STRUCT_TM_TM_GMTOFF
  87     ASSERT (result->tm_gmtoff == (1 + result->tm_isdst) * 3600);
  88 #endif
  89 #if HAVE_STRUCT_TM_TM_ZONE
  90     printf ("tm_zone = %s\n", result->tm_zone == NULL ? "(null)" : result->tm_zone);
  91     ASSERT (strcmp (result->tm_zone, "CEST") == 0);
  92 #endif
  93   }
  94
  95   /* 1 second before and 1 second after the DST interval started.  */
  96   {
  97     time_t t = 1174784399; /* 2007-03-25 01:59:59 */
  98     struct tm tm;
  99     struct tm *result = localtime_r (&t, &tm);
 100     ASSERT (result == &tm);
 101     ASSERT (result->tm_sec == 59);
 102     ASSERT (result->tm_min == 59);
 103     ASSERT (result->tm_hour == 1);
 104     ASSERT (result->tm_mday == 25);
 105     ASSERT (result->tm_mon == 3 - 1);
 106     ASSERT (result->tm_year == 2007 - 1900);
 107     ASSERT (result->tm_wday == 0);
 108     ASSERT (result->tm_yday == 83);
 109     ASSERT (result->tm_isdst == 0);
 110 #if HAVE_STRUCT_TM_TM_GMTOFF
 111     ASSERT (result->tm_gmtoff == (1 + result->tm_isdst) * 3600);
 112 #endif
 113 #if HAVE_STRUCT_TM_TM_ZONE
 114     printf ("tm_zone = %s\n", result->tm_zone == NULL ? "(null)" : result->tm_zone);
 115     ASSERT (strcmp (result->tm_zone, "CET") == 0);
 116 #endif
 117   }
 118   {
 119     time_t t = 1174784401; /* 2007-03-25 03:00:01 */
 120     struct tm tm;
 121     struct tm *result = localtime_r (&t, &tm);
 122     ASSERT (result == &tm);
 123     ASSERT (result->tm_sec == 1);
 124     ASSERT (result->tm_min == 0);
 125     ASSERT (result->tm_hour == 3);
 126     ASSERT (result->tm_mday == 25);
 127     ASSERT (result->tm_mon == 3 - 1);
 128     ASSERT (result->tm_year == 2007 - 1900);
 129     ASSERT (result->tm_wday == 0);
 130     ASSERT (result->tm_yday == 83);
 131     ASSERT (result->tm_isdst == 1);
 132 #if HAVE_STRUCT_TM_TM_GMTOFF
 133     ASSERT (result->tm_gmtoff == (1 + result->tm_isdst) * 3600);
 134 #endif
 135 #if HAVE_STRUCT_TM_TM_ZONE
 136     printf ("tm_zone = %s\n", result->tm_zone == NULL ? "(null)" : result->tm_zone);
 137     ASSERT (strcmp (result->tm_zone, "CEST") == 0);
 138 #endif
 139   }
 140
 141   /* 1 second before and 1 second after the DST interval ended.  */
 142   {
 143     time_t t = 1193533199; /* 2007-10-28 02:59:59 */
 144     struct tm tm;
 145     struct tm *result = localtime_r (&t, &tm);
 146     ASSERT (result == &tm);
 147     ASSERT (result->tm_sec == 59);
 148     ASSERT (result->tm_min == 59);
 149     ASSERT (result->tm_hour == 2);
 150     ASSERT (result->tm_mday == 28);
 151     ASSERT (result->tm_mon == 10 - 1);
 152     ASSERT (result->tm_year == 2007 - 1900);
 153     ASSERT (result->tm_wday == 0);
 154     ASSERT (result->tm_yday == 300);
 155     ASSERT (result->tm_isdst == 1);
 156 #if HAVE_STRUCT_TM_TM_GMTOFF
 157     ASSERT (result->tm_gmtoff == (1 + result->tm_isdst) * 3600);
 158 #endif
 159 #if HAVE_STRUCT_TM_TM_ZONE
 160     printf ("tm_zone = %s\n", result->tm_zone == NULL ? "(null)" : result->tm_zone);
 161     ASSERT (strcmp (result->tm_zone, "CEST") == 0);
 162 #endif
 163   }
 164   {
 165     time_t t = 1193533201; /* 2007-10-28 02:00:01 */
 166     struct tm tm;
 167     struct tm *result = localtime_r (&t, &tm);
 168     ASSERT (result == &tm);
 169     ASSERT (result->tm_sec == 1);
 170     ASSERT (result->tm_min == 0);
 171     ASSERT (result->tm_hour == 2);
 172     ASSERT (result->tm_mday == 28);
 173     ASSERT (result->tm_mon == 10 - 1);
 174     ASSERT (result->tm_year == 2007 - 1900);
 175     ASSERT (result->tm_wday == 0);
 176     ASSERT (result->tm_yday == 300);
 177     ASSERT (result->tm_isdst == 0);
 178 #if HAVE_STRUCT_TM_TM_GMTOFF
 179     ASSERT (result->tm_gmtoff == (1 + result->tm_isdst) * 3600);
 180 #endif
 181 #if HAVE_STRUCT_TM_TM_ZONE
 182     printf ("tm_zone = %s\n", result->tm_zone == NULL ? "(null)" : result->tm_zone);
 183     ASSERT (strcmp (result->tm_zone, "CET") == 0);
 184 #endif
 185   }
 186
 187   return test_exit_status;
 188 }