src/joystick/beos/SDL_bejoystick.cc
author Ryan C. Gordon <icculus@icculus.org>
Sun, 10 Jan 2010 05:06:03 +0000
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permissions -rw-r--r--
Reverted r5460 ... this was merged from 1.2, but was later reverted there.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2009 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifdef SDL_JOYSTICK_BEOS
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/* This is the system specific header for the SDL joystick API */
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#include <be/support/String.h>
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#include <be/device/Joystick.h>
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extern "C"
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{
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#include "SDL_joystick.h"
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#include "../SDL_sysjoystick.h"
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#include "../SDL_joystick_c.h"
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/* The maximum number of joysticks we'll detect */
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#define MAX_JOYSTICKS	16
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/* A list of available joysticks */
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    static char *SDL_joyport[MAX_JOYSTICKS];
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    static char *SDL_joyname[MAX_JOYSTICKS];
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/* The private structure used to keep track of a joystick */
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    struct joystick_hwdata
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    {
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        BJoystick *stick;
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        uint8 *new_hats;
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        int16 *new_axes;
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    };
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/* Function to scan the system for joysticks.
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 * This function should set SDL_numjoysticks to the number of available
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 * joysticks.  Joystick 0 should be the system default joystick.
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 * It should return 0, or -1 on an unrecoverable fatal error.
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 */
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    int SDL_SYS_JoystickInit(void)
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    {
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        BJoystick joystick;
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        int numjoysticks;
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        int i;
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        int32 nports;
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        char name[B_OS_NAME_LENGTH];
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        /* Search for attached joysticks */
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          nports = joystick.CountDevices();
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          numjoysticks = 0;
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          SDL_memset(SDL_joyport, 0, (sizeof SDL_joyport));
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          SDL_memset(SDL_joyname, 0, (sizeof SDL_joyname));
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        for (i = 0; (SDL_numjoysticks < MAX_JOYSTICKS) && (i < nports); ++i)
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        {
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            if (joystick.GetDeviceName(i, name) == B_OK) {
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                if (joystick.Open(name) != B_ERROR) {
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                    BString stick_name;
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                      joystick.GetControllerName(&stick_name);
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                      SDL_joyport[numjoysticks] = strdup(name);
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                      SDL_joyname[numjoysticks] = strdup(stick_name.String());
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                      numjoysticks++;
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                      joystick.Close();
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                }
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            }
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        }
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        return (numjoysticks);
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    }
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/* Function to get the device-dependent name of a joystick */
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    const char *SDL_SYS_JoystickName(int index)
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    {
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        return SDL_joyname[index];
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    }
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/* Function to open a joystick for use.
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   The joystick to open is specified by the index field of the joystick.
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   This should fill the nbuttons and naxes fields of the joystick structure.
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   It returns 0, or -1 if there is an error.
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 */
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    int SDL_SYS_JoystickOpen(SDL_Joystick * joystick)
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    {
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        BJoystick *stick;
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        /* Create the joystick data structure */
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        joystick->hwdata = (struct joystick_hwdata *)
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            SDL_malloc(sizeof(*joystick->hwdata));
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        if (joystick->hwdata == NULL) {
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            SDL_OutOfMemory();
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            return (-1);
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        }
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        SDL_memset(joystick->hwdata, 0, sizeof(*joystick->hwdata));
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        stick = new BJoystick;
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        joystick->hwdata->stick = stick;
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        /* Open the requested joystick for use */
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        if (stick->Open(SDL_joyport[joystick->index]) == B_ERROR) {
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            SDL_SetError("Unable to open joystick");
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            SDL_SYS_JoystickClose(joystick);
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            return (-1);
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        }
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        /* Set the joystick to calibrated mode */
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        stick->EnableCalibration();
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        /* Get the number of buttons, hats, and axes on the joystick */
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        joystick->nbuttons = stick->CountButtons();
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        joystick->naxes = stick->CountAxes();
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        joystick->nhats = stick->CountHats();
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        joystick->hwdata->new_axes = (int16 *)
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            SDL_malloc(joystick->naxes * sizeof(int16));
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        joystick->hwdata->new_hats = (uint8 *)
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            SDL_malloc(joystick->nhats * sizeof(uint8));
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        if (!joystick->hwdata->new_hats || !joystick->hwdata->new_axes) {
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            SDL_OutOfMemory();
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            SDL_SYS_JoystickClose(joystick);
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            return (-1);
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        }
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        /* We're done! */
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        return (0);
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    }
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/* Function to update the state of a joystick - called as a device poll.
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 * This function shouldn't update the joystick structure directly,
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 * but instead should call SDL_PrivateJoystick*() to deliver events
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 * and update joystick device state.
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 */
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    void SDL_SYS_JoystickUpdate(SDL_Joystick * joystick)
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    {
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        static const Uint8 hat_map[9] = {
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            SDL_HAT_CENTERED,
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            SDL_HAT_UP,
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            SDL_HAT_RIGHTUP,
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            SDL_HAT_RIGHT,
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            SDL_HAT_RIGHTDOWN,
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            SDL_HAT_DOWN,
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            SDL_HAT_LEFTDOWN,
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            SDL_HAT_LEFT,
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            SDL_HAT_LEFTUP
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        };
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        const int JITTER = (32768 / 10);        /* 10% jitter threshold (ok?) */
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        BJoystick *stick;
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        int i, change;
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        int16 *axes;
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        uint8 *hats;
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        uint32 buttons;
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        /* Set up data pointers */
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        stick = joystick->hwdata->stick;
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        axes = joystick->hwdata->new_axes;
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        hats = joystick->hwdata->new_hats;
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        /* Get the new joystick state */
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        stick->Update();
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        stick->GetAxisValues(axes);
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        stick->GetHatValues(hats);
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        buttons = stick->ButtonValues();
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        /* Generate axis motion events */
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        for (i = 0; i < joystick->naxes; ++i) {
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            change = ((int32) axes[i] - joystick->axes[i]);
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            if ((change > JITTER) || (change < -JITTER)) {
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                SDL_PrivateJoystickAxis(joystick, i, axes[i]);
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            }
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        }
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        /* Generate hat change events */
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        for (i = 0; i < joystick->nhats; ++i) {
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            if (hats[i] != joystick->hats[i]) {
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                SDL_PrivateJoystickHat(joystick, i, hat_map[hats[i]]);
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            }
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        }
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        /* Generate button events */
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        for (i = 0; i < joystick->nbuttons; ++i) {
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            if ((buttons & 0x01) != joystick->buttons[i]) {
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                SDL_PrivateJoystickButton(joystick, i, (buttons & 0x01));
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            }
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            buttons >>= 1;
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        }
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    }
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/* Function to close a joystick after use */
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    void SDL_SYS_JoystickClose(SDL_Joystick * joystick)
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    {
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        if (joystick->hwdata) {
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            joystick->hwdata->stick->Close();
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            delete joystick->hwdata->stick;
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            if (joystick->hwdata->new_hats) {
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                SDL_free(joystick->hwdata->new_hats);
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            }
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            if (joystick->hwdata->new_axes) {
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                SDL_free(joystick->hwdata->new_axes);
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            }
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            SDL_free(joystick->hwdata);
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            joystick->hwdata = NULL;
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        }
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    }
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/* Function to perform any system-specific joystick related cleanup */
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    void SDL_SYS_JoystickQuit(void)
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    {
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        int i;
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        for (i = 0; SDL_joyport[i]; ++i) {
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            SDL_free(SDL_joyport[i]);
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        }
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        SDL_joyport[0] = NULL;
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        for (i = 0; SDL_joyname[i]; ++i) {
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            SDL_free(SDL_joyname[i]);
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        }
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        SDL_joyname[0] = NULL;
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    }
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};                              // extern "C"
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#endif /* SDL_JOYSTICK_BEOS */
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/* vi: set ts=4 sw=4 expandtab: */