1  /* Test that tzset sets tzname correctly (BZ #19253).
       2     Copyright (C) 2015-2023 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 <stdio.h>
      20  #include <stdlib.h>
      21  #include <string.h>
      22  #include <time.h>
      23  
      24  static int
      25  do_test (void)
      26  {
      27    int result = 0;
      28  
      29    setenv ("TZ", TZDEFRULES, 1);
      30    tzset ();
      31    const char *stdtz = strdup (tzname[0]);
      32    setenv ("TZ", "STD-1DST", 1);
      33    tzset ();
      34    if (strcmp (tzname[0], "STD") != 0)
      35      {
      36        printf ("FAIL: TZ=STD-1DST, tzname[0] = %s\n", tzname[0]);
      37        result = 1;
      38      }
      39    setenv ("TZ", TZDEFRULES, 1);
      40    tzset ();
      41    if (strcmp (tzname[0], stdtz) != 0)
      42      {
      43        printf ("FAIL: TZ=%s, tzname[0] = %s\n", TZDEFRULES, tzname[0]);
      44        result = 1;
      45      }
      46    return result;
      47  }
      48  
      49  #define TEST_FUNCTION do_test ()
      50  #include "../test-skeleton.c"