/* Copyright (C) 2001-2006 artofcode LLC.
   All Rights Reserved.
  
   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: zdosio.c 6651 2006-03-13 16:18:19Z stefan $ */
/* MS-DOS direct I/O operators. */
/* These should NEVER be included in a released configuration! */
#include "dos_.h"
#include "ghost.h"
#include "oper.h"
#include "store.h"

/* <port> .inport <word> */
private int
zinport(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    check_type(*op, t_integer);
    make_int(op, inport((int)op->value.intval));
    return 0;
}

/* <port> .inportb <byte> */
private int
zinportb(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    check_type(*op, t_integer);
    make_int(op, inportb((int)op->value.intval));
    return 0;
}

/* <port> <word> .outport - */
private int
zoutport(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    check_type(*op, t_integer);
    check_type(op[-1], t_integer);
    outport((int)op[-1].value.intval, (int)op->value.intval);
    pop(1);
    return 0;
}

/* <port> <byte> .outportb - */
private int
zoutportb(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    check_type(*op, t_integer);
    check_int_leu(op[-1], 0xff);
    outportb((int)op[-1].value.intval, (byte) op->value.intval);
    pop(1);
    return 0;
}

/* <loc> .peek <byte> */
private int
zpeek(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    check_type(*op, t_integer);
    make_int(op, *(byte *) (op->value.intval));
    return 0;
}

/* <loc> <byte> .poke - */
private int
zpoke(i_ctx_t *i_ctx_p)
{
    os_ptr op = osp;

    check_type(*op, t_integer);
    check_int_leu(op[-1], 0xff);
    *(byte *) (op[-1].value.intval) = (byte) op->value.intval;
    pop(1);
    return 0;
}

/* ------ Operator initialization ------ */

const op_def zdosio_op_defs[] =
{
    {"1.inport", zinport},
    {"1.inportb", zinportb},
    {"2.outport", zoutport},
    {"2.outportb", zoutportb},
    {"1.peek", zpeek},
    {"2.poke", zpoke},
    op_def_end(0)
};
