(* Release 3.10 *)
(*-------------------------------------------------------------------------*
*                                                                          *
*  TIMER.MOD - COMMS Toolkit timer functions                               *
*                                                                          *
*  COPYRIGHT (C) 1988..1992 Clarion Software Corporation.                  *
*  All Rights Reserved                                                     *
*                                                                          *
*--------------------------------------------------------------------------*)

IMPLEMENTATION MODULE Timer;
(*%F _OS2*)
  IMPORT SYSTEM,Lib;

  VAR
    AppTimer,OldSeconds : CARDINAL;

(*................................................*)

  PROCEDURE ReadClock():CARDINAL;
    VAR
      Regs              : SYSTEM.Registers;
    BEGIN
      Regs.AH := 2CH;
      Lib.Dos(Regs);
      RETURN Regs.DX>>8;
    END ReadClock;

(*................................................*)

  PROCEDURE TickHandler(Ticks:CARDINAL);
    VAR
      i                 : CARDINAL;
    BEGIN
      IF Ticks=0 THEN
        RETURN;
      END;
      IF AppTimer>=Ticks THEN
        DEC(AppTimer,Ticks);
      ELSE
        AppTimer:=0;
      END;
      IF Clock.Running THEN
        WITH Clock DO
          INC(Seconds,Ticks);
          IF Seconds>=60 THEN
            DEC(Seconds,60);
            INC(Minutes);
            IF Minutes=60 THEN
              Minutes:=0;
              INC(Hours);
            END;
          END;
        END;
      END;
    END TickHandler;

(*.............................................*)

  PROCEDURE UpdateTimer;
    VAR
      Seconds           : CARDINAL;
    BEGIN
      Seconds := ReadClock();
      IF Seconds>=OldSeconds THEN
        TickHandler(Seconds - OldSeconds)
      ELSE
        TickHandler((60+Seconds) - OldSeconds)
      END;
      OldSeconds := Seconds;
    END UpdateTimer;

(*................................................*)

  PROCEDURE StopClock;
    BEGIN
      Clock.Running := FALSE;
    END StopClock;

(*........................................*)

  PROCEDURE StartClock;
    BEGIN
      StopClock; (* Stop clock if it is running *)
      WITH Clock DO
        Hours:=0;
        Minutes:=0;
        Seconds:=0;
        Running := TRUE;
      END;
      OldSeconds := ReadClock();
    END StartClock;

(*........................................*)

  PROCEDURE AppTimerExpired():BOOLEAN;
    BEGIN
      RETURN AppTimer=0;
    END AppTimerExpired;

(*........................................*)

  PROCEDURE SetAppTimer(Seconds:CARDINAL);
    BEGIN
      AppTimer := Seconds;
      OldSeconds := ReadClock();
    END SetAppTimer;

(*........................................*)

  BEGIN
    AppTimer := 0;
    StopClock;
  END Timer.

(*%E*)
(*%T _OS2*)
(* OS/2 version *)
  IMPORT Dos;

  VAR
    AppTimer            : CARDINAL;
    OldSeconds          : LONGCARD;
    ginfo               : CARDINAL;
    pinfo               : CARDINAL;

(*................................................*)

  PROCEDURE ReadClock():LONGCARD;
    VAR
      tmp               : LONGCARD;
    BEGIN
      REPEAT
        tmp := [ginfo:0 Dos.PGINFOSEG]^.time;
      UNTIL tmp = [ginfo:0 Dos.PGINFOSEG]^.time;
      RETURN tmp;
    END ReadClock;

(*................................................*)

  PROCEDURE TickHandler(Ticks:CARDINAL);
    VAR
      i                 : CARDINAL;
    BEGIN
      IF Ticks=0 THEN
        RETURN;
      END;
      IF AppTimer>=Ticks THEN
        DEC(AppTimer,Ticks);
      ELSE
        AppTimer:=0;
      END;
      IF Clock.Running THEN
        WITH Clock DO
          INC(Seconds,Ticks);
          IF Seconds>=60 THEN
            DEC(Seconds,60);
            INC(Minutes);
            IF Minutes=60 THEN
              Minutes:=0;
              INC(Hours);
            END;
          END;
        END;
      END;
    END TickHandler;

(*.............................................*)

  PROCEDURE UpdateTimer;
    VAR
      Seconds           : LONGCARD;
    BEGIN
      Seconds := ReadClock();
      TickHandler(VAL(CARDINAL,Seconds-OldSeconds));
      OldSeconds := Seconds;
    END UpdateTimer;

(*................................................*)

  PROCEDURE StopClock;
    BEGIN
      Clock.Running := FALSE;
    END StopClock;

(*........................................*)

  PROCEDURE StartClock;
    BEGIN
      StopClock; (* Stop clock if it is running *)
      WITH Clock DO
        Hours:=0;
        Minutes:=0;
        Seconds:=0;
        Running := TRUE;
      END;
      OldSeconds := ReadClock();
    END StartClock;

(*........................................*)

  PROCEDURE AppTimerExpired():BOOLEAN;
    BEGIN
      RETURN AppTimer=0;
    END AppTimerExpired;

(*........................................*)

  PROCEDURE SetAppTimer(Seconds:CARDINAL);
    BEGIN
      AppTimer := Seconds;
      OldSeconds := ReadClock();
    END SetAppTimer;

(*........................................*)

  BEGIN
    Dos.GetInfoSeg(ginfo,pinfo);
    AppTimer := 0;
    StopClock;
  END Timer.
(*%E*)