mame/src/emu/dipty.c

// license:BSD-3-Clause
// copyright-holders:F.Ulivi
/***************************************************************************

    dipty.h

    Device PTY interface

***************************************************************************/

#include "emu.h"
#include "osdcore.h"

device_pty_interface::device_pty_interface(const machine_config &mconfig, device_t &device)
    : device_interface(device, "pty"),
      m_pty_master(NULL),
      m_slave_name(),
      m_opened(false)
{
}

device_pty_interface::~device_pty_interface()
{
}

bool device_pty_interface::open(void)
{
    if (!m_opened) {
        char buffer[ 128 ];

        if (osd_openpty(&m_pty_master , buffer , sizeof(buffer)) == FILERR_NONE) {
            m_opened = true;
            m_slave_name.assign(buffer);
        } else {
            m_opened = false;
            m_pty_master = NULL;
        }
    }

    return m_opened;
}

void device_pty_interface::close(void)
{
    if (m_opened) {
        osd_close(m_pty_master);
        m_opened = false;
    }
}

bool device_pty_interface::is_open(void) const
{
    return m_opened;
}

ssize_t device_pty_interface::read(UINT8 *rx_chars , size_t count)
{
    UINT32 actual_bytes;

    if (m_opened && osd_read(m_pty_master, rx_chars, 0, count, &actual_bytes) == FILERR_NONE) {
        return actual_bytes;
    } else {
        return -1;
    }
}

void device_pty_interface::write(UINT8 tx_char)
{
    UINT32 actual_bytes;

    if (m_opened) {
        osd_write(m_pty_master, &tx_char, 0, 1, &actual_bytes);
    }
}

bool device_pty_interface::is_slave_connected(void) const
{
    // TODO: really check for slave status
    return m_opened;
}

const char *device_pty_interface::slave_name(void) const
{
    return m_slave_name.c_str();
}