lib/tatime.c

   1 /* tatime.c */
   2
   3 /*
   4  * Copyright (C) 2011-2016 by Werner Lemberg.
   5  *
   6  * This file is part of the ttfautohint library, and may only be used,
   7  * modified, and distributed under the terms given in `COPYING'.  By
   8  * continuing to use, modify, or distribute this file you indicate that you
   9  * have read `COPYING' and understand and accept it fully.
  10  *
  11  * The file `COPYING' mentioned in the previous paragraph is distributed
  12  * with the ttfautohint library.
  13  */
  14
  15
  16 #include <time.h>
  17
  18 #include "ta.h"
  19
  20
  21 void
  22 TA_get_current_time(FONT* font,
  23                     FT_ULong* high,
  24                     FT_ULong* low)
  25 {
  26   /* there have been 24107 days between January 1st, 1904 (the epoch of */
  27   /* OpenType), and January 1st, 1970 (the epoch of the `time' function) */
  28   const unsigned long long seconds_to_1970 = 24107 * 24 * 60 * 60;
  29   unsigned long long seconds_to_today = seconds_to_1970;
  30
  31
  32   if (font->epoch != ULLONG_MAX)
  33     // we don't take care of potential overflow
  34     seconds_to_today += font->epoch;
  35   else
  36     seconds_to_today += (unsigned long long)time(NULL);
  37
  38   *high = (FT_ULong)(seconds_to_today >> 32);
  39   *low = (FT_ULong)seconds_to_today;
  40 }
  41
  42 /* end of tatime.c */