rom/timer/cmptime.c

   1 /*
   2     Copyright © 1995-2001, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc: CmpTime() - compare two time values.
   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(LONG, CmpTime,
  17
  18 /*  SYNOPSIS */
  19         AROS_LHA(struct timeval *, dest, A0),
  20         AROS_LHA(struct timeval *, src, A1),
  21
  22 /*  LOCATION */
  23         struct Device *, TimerBase, 9, Timer)
  24
  25 /*  FUNCTION
  26         CmpTime() will compare two timeval's for magnitude, and return
  27         which is the larger.
  28
  29     INPUTS
  30         dest    -   Destination timeval
  31         src     -   Source timeval
  32
  33     RESULT
  34         < 0 if dest has more time than src (ie dest > src)
  35         = 0 if dest and src are the same (ie dest == src)
  36         > 0 if dest has less time than src (ie dest < src)
  37
  38     NOTES
  39         This function is safe to call from interrupts.
  40
  41     EXAMPLE
  42
  43     BUGS
  44         The registers A0 and A1 may not be preserved.
  45
  46     SEE ALSO
  47         AddTime(), SubTime()
  48
  49     INTERNALS
  50
  51     HISTORY
  52         18-02-1997  iaint   Implemented.
  53
  54 *****************************************************************************/
  55 {
  56     AROS_LIBFUNC_INIT
  57     AROS_LIBBASE_EXT_DECL(struct Device *,TimerBase)
  58
  59     if(dest->tv_secs == src->tv_secs)
  60         return (src->tv_micro - dest->tv_micro);
  61     else
  62         return (src->tv_secs - dest->tv_secs);
  63
  64     AROS_LIBFUNC_EXIT
  65 } /* CmpTime */