vlc/modules/lua/libs/win.c

/*****************************************************************************
 * win.c: Windows specific functions
 *****************************************************************************
 * Copyright (C) 2007-2012 the VideoLAN team
 * $Id$
 *
 * Authors: Antoine Cellerier <dionoea at videolan tod org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>

#include "../vlc.h"
#include "../libs.h"

#if !VLC_WINSTORE_APP

/* Based on modules/control/rc.c and include/vlc_interface.h */
static HANDLE GetConsole( lua_State *L )
{
    /* Get the file descriptor of the console input */
    HANDLE hConsoleIn = GetStdHandle(STD_INPUT_HANDLE);
    if( hConsoleIn == INVALID_HANDLE_VALUE )
        luaL_error( L, "couldn't find user input handle" );
    return hConsoleIn;
}

#define MAX_LINE_LENGTH 1024

static bool ReadWin32( HANDLE *hConsoleIn, char *p_buffer, int *pi_size )
{
    INPUT_RECORD input_record;
    DWORD i_dw;

    while( *pi_size < MAX_LINE_LENGTH &&
           ReadConsoleInput( hConsoleIn, &input_record, 1, &i_dw ) )
    {
        if( input_record.EventType != KEY_EVENT ||
            !input_record.Event.KeyEvent.bKeyDown ||
            input_record.Event.KeyEvent.wVirtualKeyCode == VK_SHIFT ||
            input_record.Event.KeyEvent.wVirtualKeyCode == VK_CONTROL||
            input_record.Event.KeyEvent.wVirtualKeyCode == VK_MENU ||
            input_record.Event.KeyEvent.wVirtualKeyCode == VK_CAPITAL )
        {
            /* nothing interesting */
            continue;
        }

        p_buffer[ *pi_size ] = input_record.Event.KeyEvent.uChar.AsciiChar;

        /* Echo out the command */
        putc( p_buffer[ *pi_size ], stdout );

        /* Handle special keys */
        if( p_buffer[ *pi_size ] == '\r' || p_buffer[ *pi_size ] == '\n' )
        {
            if ( p_buffer[ *pi_size ] == '\r' )
                p_buffer[ *pi_size ] = '\n';
            (*pi_size)++; /* We want the \n to be in the output string */
            putc( '\n', stdout );
            break;
        }
        switch( p_buffer[ *pi_size ] )
        {
        case '\b':
            if( *pi_size )
            {
                *pi_size -= 2;
                putc( ' ', stdout );
                putc( '\b', stdout );
            }
            break;
        //case '\r':
        //    (*pi_size) --;
        //    break;
        }

        (*pi_size)++;
    }

    if( *pi_size == MAX_LINE_LENGTH )
      // p_buffer[ *pi_size ] == '\r' || p_buffer[ *pi_size ] == '\n' )
    {
        p_buffer[ *pi_size ] = 0;
        return true;
    }

    return false;
}

static int vlclua_console_init( lua_State *L )
{
    (void)L;
    //if ( !AllocConsole() )
    //    luaL_error( L, "failed to allocate windows console" );
    AllocConsole();

    freopen( "CONOUT$", "w", stdout );
    freopen( "CONOUT$", "w", stderr );
    freopen( "CONIN$", "r", stdin );
    return 0;
}

static int vlclua_console_wait( lua_State *L )
{
    int i_timeout = (int)luaL_optinteger( L, 1, 0 );
    DWORD status = WaitForSingleObject( GetConsole( L ), i_timeout );
    lua_pushboolean( L, status == WAIT_OBJECT_0 );
    return 1;
}


static int vlclua_console_read( lua_State *L )
{
    char psz_buffer[MAX_LINE_LENGTH+1];
    int i_size = 0;
    ReadWin32( GetConsole( L ), psz_buffer, &i_size );
    lua_pushlstring( L, psz_buffer, i_size );

    return 1;
}


/*****************************************************************************
 *
 *****************************************************************************/
static const luaL_Reg vlclua_win_reg[] = {
    { "console_init", vlclua_console_init },
    { "console_wait", vlclua_console_wait },
    { "console_read", vlclua_console_read },
    { NULL, NULL }
};

void luaopen_win( lua_State *L )
{
    lua_newtable( L );
    luaL_register( L, NULL, vlclua_win_reg );
    lua_setfield( L, -2, "win" );
}

#endif /* !VLC_WINSTORE_APP */