test/test_time.c

   1 // Copyright: CC0
   2 // Compare timegm() with util_timegm()
   3 //  NB Need to force util_timegm() to use our fallback version
   4 //  Otherwise it will be using timegm()
   5 #include <glib.h>
   6 #include <glib/gstdio.h>
   7 #include <time.h>
   8 #include "util.h"
   9
  10 // run like - 'for now':
  11 //  ./test_time $(date +"%Y:%m:%d-%H:%M:%S")
  12 // Or manually substitute interesting dates as appropriate
  13 //  e.g.  '2400:03:01-10:11:12'
  14 int main(int argc, char *argv[])
  15 {
  16 #if !GLIB_CHECK_VERSION(2,36,0)
  17   g_type_init ();
  18 #endif
  19
  20   if ( !argv[1] ) {
  21     g_printerr ( "Nothing specified\n" );
  22     return 1;
  23   }
  24
  25   struct tm Time;
  26   Time.tm_wday = 0;
  27   Time.tm_yday = 0;
  28   Time.tm_isdst = 0; // there is no DST in UTC
  29
  30   sscanf(argv[1], "%d:%d:%d-%d:%d:%d",
  31                   &Time.tm_year, &Time.tm_mon,
  32                   &Time.tm_mday, &Time.tm_hour,
  33                   &Time.tm_min, &Time.tm_sec);
  34
  35   Time.tm_year -= 1900;
  36   Time.tm_mon  -= 1;
  37
  38   time_t thetime = util_timegm ( &Time );
  39
  40   if ( thetime != timegm ( &Time ) ) {
  41     g_printf ("%s - %lu - %lu\n", argv[1], thetime, timegm(&Time));
  42     g_printf ("diff = %ld\n", (thetime - timegm(&Time)));
  43     return 1;
  44   }
  45
  46   return 0;
  47 }