src/joystick/beos/SDL_bejoystick.cc
author Edward Rudd <urkle@outoforder.cc>
Wed, 26 Sep 2012 14:08:46 -0400
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child 6698 28ab2ef7bfc9
permissions -rwxr-xr-x
allocate *Hint structures per Xlib docs
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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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: */