timezone/tst-timezone.c

   1 /* Copyright (C) 1998-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library 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 GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <time.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <stdint.h>
  23 #include <unistd.h>
  24
  25 int failed = 0;
  26
  27 struct test_times
  28 {
  29   const char *name;
  30   int daylight;
  31   int timezone;
  32   const char *tzname[2];
  33 };
  34
  35 static const struct test_times tests[] =
  36 {
  37   { "Europe/Amsterdam", 1, -3600, { "CET", "CEST" }},
  38   { "Europe/Berlin", 1, -3600, { "CET", "CEST" }},
  39   { "Europe/London", 1, 0, { "GMT", "BST" }},
  40   { "Universal", 0, 0, {"UTC", "UTC" }},
  41   { "Australia/Melbourne", 1, -36000, { "EST", "EST" }},
  42   { "America/Sao_Paulo", 1, 10800, {"BRT", "BRST" }},
  43   { "America/Chicago", 1, 21600, {"CST", "CDT" }},
  44   { "America/Indiana/Indianapolis", 1, 18000, {"EST", "EDT" }},
  45   { "America/Los_Angeles", 1, 28800, {"PST", "PDT" }},
  46   { "Pacific/Auckland", 1, -43200, { "NZST", "NZDT" }},
  47   { NULL, 0, 0 }
  48 };
  49
  50 /* This string will be used for `putenv' calls.  */
  51 char envstring[100];
  52
  53 static void
  54 print_tzvars (void)
  55 {
  56   printf ("tzname[0]: %s\n", tzname[0]);
  57   printf ("tzname[1]: %s\n", tzname[1]);
  58   printf ("daylight: %d\n", daylight);
  59   printf ("timezone: %ld\n", timezone);
  60 }
  61
  62
  63 static void
  64 check_tzvars (const char *name, int dayl, int timez, const char *const tznam[])
  65 {
  66   int i;
  67
  68   if (daylight != dayl)
  69     {
  70       printf ("*** Timezone: %s, daylight is: %d but should be: %d\n",
  71               name, daylight, dayl);
  72       ++failed;
  73     }
  74   if (timezone != timez)
  75     {
  76       printf ("*** Timezone: %s, timezone is: %ld but should be: %d\n",
  77               name, timezone, timez);
  78       ++failed;
  79     }
  80   for (i = 0; i <= 1; ++i)
  81     if (strcmp (tzname[i], tznam[i]) != 0)
  82       {
  83         printf ("*** Timezone: %s, tzname[%d] is: %s but should be: %s\n",
  84                 name, i, tzname[i], tznam[i]);
  85         ++failed;
  86       }
  87 }
  88
  89
  90 static int
  91 do_test (void)
  92 {
  93   time_t t;
  94   const struct test_times *pt;
  95   char buf[BUFSIZ];
  96
  97   /* This should be: Fri May 15 01:02:16 1998 (UTC).  */
  98   t = 895194136;
  99   printf ("We use this date: %s\n", asctime (gmtime (&t)));
 100
 101   for (pt = tests; pt->name != NULL; ++pt)
 102     {
 103       /* Start with a known state */
 104       printf ("Checking timezone %s\n", pt->name);
 105       sprintf (buf, "TZ=%s", pt->name);
 106       if (putenv (buf))
 107         {
 108           puts ("putenv failed.");
 109           failed = 1;
 110         }
 111       tzset ();
 112       print_tzvars ();
 113       check_tzvars (pt->name, pt->daylight, pt->timezone, pt->tzname);
 114
 115       /* calling localtime shouldn't make a difference */
 116       localtime (&t);
 117       print_tzvars ();
 118       check_tzvars (pt->name, pt->daylight, pt->timezone, pt->tzname);
 119     }
 120
 121   /* From a post of Scott Harrington <seh4@ix.netcom.com> to the timezone
 122      mailing list.  */
 123   {
 124     struct tm tmBuf = {0, 0, 0, 10, 3, 98, 0, 0, -1};
 125     char buf[200];
 126     strcpy (envstring, "TZ=Europe/London");
 127     putenv (envstring);
 128     t = mktime (&tmBuf);
 129     snprintf (buf, sizeof (buf), "TZ=%s %jd %d %d %d %d %d %d %d %d %d",
 130               getenv ("TZ"), (intmax_t) t,
 131               tmBuf.tm_sec, tmBuf.tm_min, tmBuf.tm_hour,
 132               tmBuf.tm_mday, tmBuf.tm_mon, tmBuf.tm_year,
 133               tmBuf.tm_wday, tmBuf.tm_yday, tmBuf.tm_isdst);
 134     fputs (buf, stdout);
 135     puts (" should be");
 136     puts ("TZ=Europe/London 892162800 0 0 0 10 3 98 5 99 1");
 137     if (strcmp (buf, "TZ=Europe/London 892162800 0 0 0 10 3 98 5 99 1") != 0)
 138       {
 139         failed = 1;
 140         fputs (" FAILED ***", stdout);
 141       }
 142   }
 143
 144   printf("\n");
 145
 146   {
 147     struct tm tmBuf = {0, 0, 0, 10, 3, 98, 0, 0, -1};
 148     char buf[200];
 149     strcpy (envstring, "TZ=GMT");
 150     /* No putenv call needed!  */
 151     t = mktime (&tmBuf);
 152     snprintf (buf, sizeof (buf), "TZ=%s %jd %d %d %d %d %d %d %d %d %d",
 153               getenv ("TZ"), (intmax_t) t,
 154               tmBuf.tm_sec, tmBuf.tm_min, tmBuf.tm_hour,
 155               tmBuf.tm_mday, tmBuf.tm_mon, tmBuf.tm_year,
 156               tmBuf.tm_wday, tmBuf.tm_yday, tmBuf.tm_isdst);
 157     fputs (buf, stdout);
 158     puts (" should be");
 159     puts ("TZ=GMT 892166400 0 0 0 10 3 98 5 99 0");
 160     if (strcmp (buf, "TZ=GMT 892166400 0 0 0 10 3 98 5 99 0") != 0)
 161       {
 162         failed = 1;
 163         fputs (" FAILED ***", stdout);
 164       }
 165   }
 166
 167   return failed ? EXIT_FAILURE : EXIT_SUCCESS;
 168 }
 169
 170 #define TEST_FUNCTION do_test ()
 171 #include "../test-skeleton.c"