/*

    File:       TrapUtils.c

    Contains:   Functions to help you when you are building and sending Apple events.

    Written by:     

    Copyright:  Copyright © 1996-1999 by Apple Computer, Inc., All Rights Reserved.

                You may incorporate this Apple sample source code into your program(s) without

                restriction. This Apple sample source code has been provided "AS IS" and the

                responsibility for its operation is yours. You are not permitted to redistribute

                this Apple sample source code as "Apple sample source code" after having made

                changes. If you're going to re-distribute the source, we require that you make

                it clear in the source that the code was descended from Apple sample source

                code, but that you've made changes.

    Change History (most recent first):

                7/22/1999   Karl Groethe    Updated for Metrowerks Codewarror Pro 2.1

*/

//  System includes

#include <OSUtils.h>

#include <Traps.h>

//  Utility routines

#include "TrapUtils.h"

// ===============================================================================

static pascal UInt16 CountToolboxTraps( void )

{

    static UInt16 trapCount;

    if ( !trapCount )

    {

        if ( GetToolTrapAddress( _InitGraf ) == GetToolTrapAddress( 0xAA6E ) )

        {

            trapCount = 0x0200;

        }

        else

        {

            trapCount = 0x0400;

        }

    }

    return trapCount;

}

// ===============================================================================

static pascal TrapType GetTrapType( UInt16 trapWord )

{

    if ( trapWord & 0x0800 )

    {

        return ToolTrap;

    }

    else

    {

        return OSTrap;

    }

}

// ===============================================================================

pascal Boolean TrapAvailable( UInt16 trapWord )

{

    if ( GetTrapType( trapWord ) == OSTrap )

    {

        return GetToolTrapAddress( _Unimplemented ) != GetOSTrapAddress( trapWord );

    }

    else if ( ( trapWord & 0x07FF ) >= CountToolboxTraps () )

    {

        return false;

    }

    else

    {

        return GetToolTrapAddress( _Unimplemented ) != GetToolTrapAddress ( trapWord );

    }

}

// ===============================================================================

pascal void * MyGetTrapAddress( UInt16 trapWord )

{

    if ( GetTrapType( trapWord ) == OSTrap )

    {

        return GetOSTrapAddress( trapWord );

    }

    else

    {

        return GetToolTrapAddress( trapWord );

    }

}

// ===============================================================================

pascal void MySetTrapAddress( UInt16 trapWord, void *newAddr )

{

    if ( GetTrapType( trapWord ) == OSTrap )

    {

        SetOSTrapAddress( newAddr, trapWord );

    }

    else

    {

        SetToolTrapAddress( newAddr, trapWord );

    }

}