compiler/clib/time.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Return the current time in seconds.
   6 */
   7
   8 #include <dos/dos.h>
   9 #include <proto/dos.h>
  10
  11 long __gmtoffset;
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <time.h>
  17
  18         time_t time (
  19
  20 /*  SYNOPSIS */
  21         time_t * tloc)
  22
  23 /*  FUNCTION
  24        time() returns the time since 00:00:00 GMT, January 1, 1970,
  25        measured in seconds.
  26
  27     INPUTS
  28         tloc - If this pointer is non-NULL, then the time is written into
  29                 this variable as well.
  30
  31     RESULT
  32         The number of seconds.
  33
  34     NOTES
  35         This function must not be used in a shared library or
  36         in a threaded application.
  37
  38     EXAMPLE
  39         time_t tt1, tt2;
  40
  41         // tt1 and tt2 are the same
  42         tt1 = time (&tt2);
  43
  44         // This is valid, too
  45         tt1 = time (NULL);
  46
  47     BUGS
  48
  49     SEE ALSO
  50         ctime(), asctime(), localtime()
  51
  52     INTERNALS
  53
  54 ******************************************************************************/
  55 {
  56     struct DateStamp t;
  57     time_t           tt;
  58
  59     DateStamp (&t); /* Get timestamp */
  60
  61     /*
  62         2922 is the number of days between 1.1.1970 and 1.1.1978 (2 leap
  63                 years and 6 normal). The former number is the start value
  64                 for time(), the latter the start time for the AmigaOS
  65                 time functions.
  66         1440 is the number of minutes per day
  67         60 is the number of seconds per minute
  68     */
  69     tt = ((t.ds_Days + 2922) * 1440 + t.ds_Minute + __gmtoffset) * 60
  70         + t.ds_Tick / TICKS_PER_SECOND;
  71
  72     if (tloc != NULL)
  73         *tloc = tt;
  74
  75     return tt;
  76 } /* time */
  77