time/tst-mktime.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <time.h>
   5
   6 int
   7 main (void)
   8 {
   9   struct tm time_str, *tm;
  10   time_t t;
  11   char daybuf[20];
  12   int result;
  13
  14   time_str.tm_year = 2001 - 1900;
  15   time_str.tm_mon = 7 - 1;
  16   time_str.tm_mday = 4;
  17   time_str.tm_hour = 0;
  18   time_str.tm_min = 0;
  19   time_str.tm_sec = 1;
  20   time_str.tm_isdst = -1;
  21
  22   if (mktime (&time_str) == -1)
  23     {
  24       (void) puts ("-unknown-");
  25       result = 1;
  26     }
  27   else
  28     {
  29       (void) strftime (daybuf, sizeof (daybuf), "%A", &time_str);
  30       (void) puts (daybuf);
  31       result = strcmp (daybuf, "Wednesday") != 0;
  32     }
  33
  34   setenv ("TZ", "EST+5", 1);
  35 #define EVENING69 1 * 60 * 60 + 2 * 60 + 29
  36   t = EVENING69;
  37   tm = localtime (&t);
  38   if (tm == NULL)
  39     {
  40       (void) puts ("localtime returned NULL");
  41       result = 1;
  42     }
  43   else
  44     {
  45       time_str = *tm;
  46       t = mktime (&time_str);
  47       if (t != EVENING69)
  48         {
  49           printf ("mktime returned %ld, expected %d\n",
  50                   (long) t, EVENING69);
  51           result = 1;
  52         }
  53       else
  54         (void) puts ("Dec 31 1969 EST test passed");
  55
  56       setenv ("TZ", "CET-1", 1);
  57       t = mktime (&time_str);
  58 #define EVENING69_CET (EVENING69 - (5 - -1) * 60 * 60)
  59       if (t != EVENING69_CET)
  60         {
  61           printf ("mktime returned %ld, expected %ld\n",
  62                   (long) t, (long) EVENING69_CET);
  63           result = 1;
  64         }
  65       else
  66         (void) puts ("Dec 31 1969 CET test passed");
  67     }
  68
  69   return result;
  70 }