rom/timer/addtime.c

   1 /*
   2     Copyright © 1995-2007, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: AddTime() - add two timeval's together.
   6     Lang: english
   7 */
   8 #include "timer_intern.h"
   9
  10 /*****************************************************************************
  11
  12     NAME */
  13 #include <devices/timer.h>
  14 #include <proto/timer.h>
  15
  16         AROS_LH2(void, AddTime,
  17
  18 /*  SYNOPSIS */
  19         AROS_LHA(struct timeval *, dest, A0),
  20         AROS_LHA(struct timeval *, src, A1),
  21
  22 /*  LOCATION */
  23         struct Device *, TimerBase, 7, Timer)
  24
  25 /*  FUNCTION
  26         Add two timeval's together. The result will be the sum
  27         dest + src --> dest.
  28
  29         The values of A0 and A1 will not be changed.
  30
  31     INPUTS
  32         dest    -   Destination timeval.
  33         src     -   Source timeval.
  34
  35     RESULT
  36         dest will contain (src + dest).
  37
  38     NOTES
  39         This function can be called from Interrupts.
  40
  41     EXAMPLE
  42
  43     BUGS
  44
  45     SEE ALSO
  46         SubTime(), CmpTime()
  47
  48     INTERNALS
  49
  50     HISTORY
  51         27-11-96    digulla automatically created from
  52                             timer_lib.fd and clib/timer_protos.h
  53
  54 *****************************************************************************/
  55 {
  56     AROS_LIBFUNC_INIT
  57
  58     dest->tv_micro += src->tv_micro;
  59     dest->tv_secs += src->tv_secs;
  60
  61     /* Normalize the result. */
  62     while(dest->tv_micro > 999999)
  63     {
  64         dest->tv_secs++;
  65         dest->tv_micro -= 1000000;
  66     }
  67
  68     AROS_LIBFUNC_EXIT
  69 } /* AddTime */