/*

SDL - Simple DirectMedia Layer

Copyright (C) 1997-2006 Sam Lantinga

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library 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

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Sam Lantinga

slouken@libsdl.org

*/

#include "SDL_config.h"

#ifdef SDL_JOYSTICK_OS2

/* OS/2 Joystick driver, contributed by Daniel Caetano */

#include <mem.h>

#define INCL_DOSDEVICES

#define INCL_DOSDEVIOCTL

#define INCL_DOSMEMMGR

#include <os2.h>

#include "joyos2.h"

#include "SDL_joystick.h"

#include "SDL_events.h"

#include "../SDL_sysjoystick.h"

#include "../SDL_joystick_c.h"

HFILE hJoyPort = NULL; /* Joystick GAME$ Port Address */

#define MAX_JOYSTICKS 2 /* Maximum of two joysticks */

#define MAX_AXES 4 /* each joystick can have up to 4 axes */

#define MAX_BUTTONS 8 /* 8 buttons */

#define MAX_HATS 0 /* 0 hats - OS/2 doesn't support it */

#define MAX_BALLS 0 /* and 0 balls - OS/2 doesn't support it */

#define AXIS_MIN -32768 /* minimum value for axes coordinate */

#define AXIS_MAX 32767 /* maximum value for axes coordinate */

#define MAX_JOYNAME 128 /* Joystick name may have 128 characters */

/* limit axes to 256 possible positions to filter out noise */

#define JOY_AXIS_THRESHOLD (((AXIS_MAX)-(AXIS_MIN))/256)

/* Calc Button Flag for buttons A to D */

#define JOY_BUTTON_FLAG(n) (1<<n)

/* Joystick data... hold information about detected devices */

typedef struct SYS_JoyData_s

} SYS_JoyData_t, *SYS_JoyData_p;

SYS_JoyData_t SYS_JoyData[MAX_JOYSTICKS];

/* Structure used to convert data from OS/2 driver format to SDL format */

struct joystick_hwdata

};

/* Structure used to get values from Joystick Environment Variable */

struct _joycfg

};

/* OS/2 Implementation Function Prototypes */

APIRET joyPortOpen (HFILE * hGame);

void joyPortClose (HFILE * hGame);

int joyGetData (char *joyenv, char *name, char stopchar, size_t maxchars);

int joyGetEnv (struct _joycfg *joydata);

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

/* Function to scan the system for joysticks. */

/* This function should set SDL_numjoysticks to the number of available */

/* joysticks. Joystick 0 should be the system default joystick. */

/* It should return 0, or -1 on an unrecoverable fatal error. */

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

int

SDL_SYS_JoystickInit (void)

{

APIRET rc; /* Generic OS/2 return code */

GAME_PORT_STRUCT stJoyStatus; /* Joystick Status Structure */

GAME_PARM_STRUCT stGameParms; /* Joystick Parameter Structure */

GAME_CALIB_STRUCT stGameCalib; /* Calibration Struct */

ULONG ulDataLen; /* Size of data */

ULONG ulLastTick; /* Tick Counter for timing operations */

Uint8 maxdevs; /* Maximum number of devices */

Uint8 numdevs; /* Number of present devices */

Uint8 maxbut; /* Maximum number of buttons... */

Uint8 i; /* Temporary Count Vars */

Uint8 ucNewJoystickMask; /* Mask for Joystick Detection */

struct _joycfg joycfg; /* Joy Configuration from envvar */

/* Get Max Number of Devices */

rc = joyPortOpen (&hJoyPort); /* Open GAME$ port */

if (rc != 0)

return 0; /* Cannot open... report no joystick */

ulDataLen = sizeof (stGameParms);

rc = DosDevIOCtl (hJoyPort, IOCTL_CAT_USER, GAME_GET_PARMS, NULL, 0, NULL, &stGameParms, ulDataLen, &ulDataLen); /* Ask device info */

if (rc != 0) {

joyPortClose (&hJoyPort);

SDL_SetError ("Could not read joystick port.");

return -1;

}

if (stGameParms.useA != 0)

maxdevs++;

if (stGameParms.useB != 0)

maxdevs++;

if (maxdevs > MAX_JOYSTICKS)

maxdevs = MAX_JOYSTICKS;

/* Defines min/max axes values (callibration) */

ulDataLen = sizeof (stGameCalib);

rc = DosDevIOCtl (hJoyPort, IOCTL_CAT_USER, GAME_GET_CALIB,

NULL, 0, NULL, &stGameCalib, ulDataLen, &ulDataLen);

if (rc != 0) {

joyPortClose (&hJoyPort);

SDL_SetError ("Could not read callibration data.");

return -1;

}

/* Determine how many joysticks are active */

numdevs = 0; /* Points no device */

ucNewJoystickMask = 0x0F; /* read all 4 joystick axis */

ulDataLen = sizeof (ucNewJoystickMask);

rc = DosDevIOCtl (hJoyPort, IOCTL_CAT_USER, GAME_PORT_RESET,

&ucNewJoystickMask, ulDataLen, &ulDataLen, NULL, 0,

NULL);

if (rc == 0) {

ulDataLen = sizeof (stJoyStatus);

rc = DosDevIOCtl (hJoyPort, IOCTL_CAT_USER, GAME_PORT_GET,

NULL, 0, NULL, &stJoyStatus, ulDataLen, &ulDataLen);

if (rc != 0) {

joyPortClose (&hJoyPort);

SDL_SetError ("Could not call joystick port.");

return -1;

}

ulLastTick = stJoyStatus.ulJs_Ticks;

while (stJoyStatus.ulJs_Ticks == ulLastTick) {

rc = DosDevIOCtl (hJoyPort, IOCTL_CAT_USER, GAME_PORT_GET,

NULL, 0, NULL, &stJoyStatus, ulDataLen,

&ulDataLen);

}

if ((stJoyStatus.ucJs_JoyStickMask & 0x03) > 0)

numdevs++;

if (((stJoyStatus.ucJs_JoyStickMask >> 2) & 0x03) > 0)

numdevs++;

}

if (numdevs > maxdevs)

numdevs = maxdevs;

/* If *any* joystick was detected... Let's configure SDL for them */

if (numdevs > 0) {

/* Verify if it is a "user defined" joystick */

if (joyGetEnv (&joycfg)) {

GAME_3POS_STRUCT *axis[4];

axis[0] = &stGameCalib.Ax;

axis[1] = &stGameCalib.Ay;

axis[2] = &stGameCalib.Bx;

axis[3] = &stGameCalib.By;

/* Say it has one device only (user defined is always one device only) */

numdevs = 1;

/* Define Device 0 as... */

SYS_JoyData[0].id = 0;

/* Define Number of Axes... up to 4 */

if (joycfg.axes > MAX_AXES)

joycfg.axes = MAX_AXES;

SYS_JoyData[0].axes = joycfg.axes;

/* Define number of buttons... 8 if 2 axes, 6 if 3 axes and 4 if 4 axes */

maxbut = MAX_BUTTONS;

if (joycfg.axes > 2)

maxbut -= ((joycfg.axes - 2) << 1); /* MAX_BUTTONS - 2*(axes-2) */

if (joycfg.buttons > maxbut)

joycfg.buttons = maxbut;

SYS_JoyData[0].buttons = joycfg.buttons;

/* Define number of hats */

if (joycfg.hats > MAX_HATS)

joycfg.hats = MAX_HATS;

SYS_JoyData[0].hats = joycfg.hats;

/* Define number of balls */

if (joycfg.balls > MAX_BALLS)

joycfg.balls = MAX_BALLS;

SYS_JoyData[0].balls = joycfg.balls;

/* Initialize Axes Callibration Values */

for (i = 0; i < joycfg.axes; i++) {

SYS_JoyData[0].axes_min[i] = axis[i]->lower;

SYS_JoyData[0].axes_med[i] = axis[i]->centre;

SYS_JoyData[0].axes_max[i] = axis[i]->upper;

}

/* Initialize Buttons 5 to 8 structures */

if (joycfg.buttons >= 5)

SYS_JoyData[0].buttoncalc[0] =

((axis[2]->lower + axis[3]->centre) >> 1);

if (joycfg.buttons >= 6)

SYS_JoyData[0].buttoncalc[1] =

((axis[3]->lower + axis[3]->centre) >> 1);

if (joycfg.buttons >= 7)

SYS_JoyData[0].buttoncalc[2] =

((axis[2]->upper + axis[3]->centre) >> 1);

if (joycfg.buttons >= 8)

SYS_JoyData[0].buttoncalc[3] =

((axis[3]->upper + axis[3]->centre) >> 1);

/* Intialize Joystick Name */

SDL_strlcpy (SYS_JoyData[0].szDeviceName, joycfg.name,

SDL_arraysize (SYS_JoyData[0].szDeviceName));

}

/* Default Init ... autoconfig */

else {

/* if two devices were detected... configure as Joy1 4 axis and Joy2 2 axis */

if (numdevs == 2) {

/* Define Device 0 as 4 axes, 4 buttons */

SYS_JoyData[0].id = 0;

SYS_JoyData[0].axes = 4;

SYS_JoyData[0].buttons = 4;

SYS_JoyData[0].hats = 0;

SYS_JoyData[0].balls = 0;

SYS_JoyData[0].axes_min[0] = stGameCalib.Ax.lower;

SYS_JoyData[0].axes_med[0] = stGameCalib.Ax.centre;

SYS_JoyData[0].axes_max[0] = stGameCalib.Ax.upper;

SYS_JoyData[0].axes_min[1] = stGameCalib.Ay.lower;

SYS_JoyData[0].axes_med[1] = stGameCalib.Ay.centre;

SYS_JoyData[0].axes_max[1] = stGameCalib.Ay.upper;

SYS_JoyData[0].axes_min[2] = stGameCalib.Bx.lower;

SYS_JoyData[0].axes_med[2] = stGameCalib.Bx.centre;

SYS_JoyData[0].axes_max[2] = stGameCalib.Bx.upper;

SYS_JoyData[0].axes_min[3] = stGameCalib.By.lower;

SYS_JoyData[0].axes_med[3] = stGameCalib.By.centre;

SYS_JoyData[0].axes_max[3] = stGameCalib.By.upper;

/* Define Device 1 as 2 axes, 2 buttons */

SYS_JoyData[1].id = 1;

SYS_JoyData[1].axes = 2;

SYS_JoyData[1].buttons = 2;

SYS_JoyData[1].hats = 0;

SYS_JoyData[1].balls = 0;

SYS_JoyData[1].axes_min[0] = stGameCalib.Bx.lower;

SYS_JoyData[1].axes_med[0] = stGameCalib.Bx.centre;

SYS_JoyData[1].axes_max[0] = stGameCalib.Bx.upper;

SYS_JoyData[1].axes_min[1] = stGameCalib.By.lower;

SYS_JoyData[1].axes_med[1] = stGameCalib.By.centre;

SYS_JoyData[1].axes_max[1] = stGameCalib.By.upper;

}

/* One joystick only? */

else {

/* If it is joystick A... */

if ((stJoyStatus.ucJs_JoyStickMask & 0x03) > 0) {

/* Define Device 0 as 2 axes, 4 buttons */

SYS_JoyData[0].id = 0;

SYS_JoyData[0].axes = 2;

SYS_JoyData[0].buttons = 4;

SYS_JoyData[0].hats = 0;

SYS_JoyData[0].balls = 0;

SYS_JoyData[0].axes_min[0] = stGameCalib.Ax.lower;

SYS_JoyData[0].axes_med[0] = stGameCalib.Ax.centre;

SYS_JoyData[0].axes_max[0] = stGameCalib.Ax.upper;

SYS_JoyData[0].axes_min[1] = stGameCalib.Ay.lower;

SYS_JoyData[0].axes_med[1] = stGameCalib.Ay.centre;

SYS_JoyData[0].axes_max[1] = stGameCalib.Ay.upper;

}

/* If not, it is joystick B */

else {

/* Define Device 1 as 2 axes, 2 buttons */

SYS_JoyData[0].id = 1;

SYS_JoyData[0].axes = 2;

SYS_JoyData[0].buttons = 2;

SYS_JoyData[0].hats = 0;

SYS_JoyData[0].balls = 0;

SYS_JoyData[0].axes_min[0] = stGameCalib.Bx.lower;

SYS_JoyData[0].axes_med[0] = stGameCalib.Bx.centre;

SYS_JoyData[0].axes_max[0] = stGameCalib.Bx.upper;

SYS_JoyData[0].axes_min[1] = stGameCalib.By.lower;

SYS_JoyData[0].axes_med[1] = stGameCalib.By.centre;

SYS_JoyData[0].axes_max[1] = stGameCalib.By.upper;

}

}

/* Hack to define Joystick Port Names */

if (numdevs > maxdevs)

numdevs = maxdevs;

for (i = 0; i < numdevs; i++)

SDL_snprintf (SYS_JoyData[i].szDeviceName,

SDL_arraysize (SYS_JoyData[i].szDeviceName),

"Default Joystick %c", 'A' + SYS_JoyData[i].id);

}

}

/* Return the number of devices found */

return (numdevs);

}

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

/* Function to get the device-dependent name of a joystick */

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

const char *

SDL_SYS_JoystickName (int index)

{

/* No need to verify if device exists, already done in upper layer */

return (SYS_JoyData[index].szDeviceName);

}

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

/* Function to open a joystick for use. */

/* The joystick to open is specified by the index field of the joystick. */

/* This should fill the nbuttons and naxes fields of the joystick structure. */

/* It returns 0, or -1 if there is an error. */

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

int

SDL_SYS_JoystickOpen (SDL_Joystick * joystick)

{

int index; /* Index shortcut for index in joystick structure */

int i; /* Generic Counter */

/* allocate memory for system specific hardware data */

joystick->hwdata =

(struct joystick_hwdata *) SDL_malloc (sizeof (*joystick->hwdata));

if (joystick->hwdata == NULL) {

SDL_OutOfMemory ();

return (-1);

}

/* Reset Hardware Data */

SDL_memset (joystick->hwdata, 0, sizeof (*joystick->hwdata));

/* ShortCut Pointer */

index = joystick->index;

/* Define offsets and scales for all axes */

joystick->hwdata->id = SYS_JoyData[index].id;

for (i = 0; i < MAX_AXES; ++i) {

if ((i < 2) || i < SYS_JoyData[index].axes) {

joystick->hwdata->transaxes[i].offset =

((AXIS_MAX + AXIS_MIN) >> 1) - SYS_JoyData[index].axes_med[i];

//joystick->hwdata->transaxes[i].scale = (float)((AXIS_MAX - AXIS_MIN)/(SYS_JoyData[index].axes_max[i]-SYS_JoyData[index].axes_min[i]));

joystick->hwdata->transaxes[i].scale1 =

(float) abs ((AXIS_MIN / SYS_JoyData[index].axes_min[i]));

joystick->hwdata->transaxes[i].scale2 =

(float) abs ((AXIS_MAX / SYS_JoyData[index].axes_max[i]));

} else {

joystick->hwdata->transaxes[i].offset = 0;

//joystick->hwdata->transaxes[i].scale = 1.0; /* Just in case */

joystick->hwdata->transaxes[i].scale1 = 1.0; /* Just in case */

joystick->hwdata->transaxes[i].scale2 = 1.0; /* Just in case */

}

}

/* fill nbuttons, naxes, and nhats fields */

joystick->nbuttons = SYS_JoyData[index].buttons;

joystick->naxes = SYS_JoyData[index].axes;

/* joystick->nhats = SYS_JoyData[index].hats; */

joystick->nhats = 0; /* No support for hats at this time */

/* joystick->nballs = SYS_JoyData[index].balls; */

joystick->nballs = 0; /* No support for balls at this time */

return 0;

}

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

/* Function to update the state of a joystick - called as a device poll. */

/* This function shouldn't update the joystick structure directly, */

/* but instead should call SDL_PrivateJoystick*() to deliver events */

/* and update joystick device state. */

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

void

SDL_SYS_JoystickUpdate (SDL_Joystick * joystick)

{

APIRET rc; /* Generic OS/2 return code */

int index; /* index shortcurt to joystick index */

int i; /* Generic counter */

int normbut; /* Number of buttons reported by joystick */

int corr; /* Correction for button names */

Sint16 value, change; /* Values used to update axis values */

struct _transaxes *transaxes; /* Shortcut for Correction structure */

Uint32 pos[MAX_AXES]; /* Vector to inform the Axis status */

ULONG ulDataLen; /* Size of data */

GAME_STATUS_STRUCT stGameStatus; /* Joystick Status Structure */

ulDataLen = sizeof (stGameStatus);

rc = DosDevIOCtl (hJoyPort, IOCTL_CAT_USER, GAME_GET_STATUS,

NULL, 0, NULL, &stGameStatus, ulDataLen, &ulDataLen);

if (rc != 0) {

SDL_SetError ("Could not read joystick status.");

return; /* Could not read data */

}

/* Shortcut pointer */

index = joystick->index;

/* joystick motion events */

if (SYS_JoyData[index].id == 0) {

pos[0] = stGameStatus.curdata.A.x;

pos[1] = stGameStatus.curdata.A.y;

if (SYS_JoyData[index].axes >= 3)

pos[2] = stGameStatus.curdata.B.x;

else

pos[2] = 0;

if (SYS_JoyData[index].axes >= 4)

pos[3] = stGameStatus.curdata.B.y;

else

pos[3] = 0;

pos[4] = 0; /* OS/2 basic drivers do not support more than 4 axes joysticks */

pos[5] = 0;

} else if (SYS_JoyData[index].id == 1) {

pos[0] = stGameStatus.curdata.B.x;

pos[1] = stGameStatus.curdata.B.y;

pos[2] = 0;

pos[3] = 0;

pos[4] = 0;

pos[5] = 0;

}

/* Corrects the movements using the callibration */

transaxes = joystick->hwdata->transaxes;

for (i = 0; i < joystick->naxes; i++) {

value = pos[i] + transaxes[i].offset;

if (value < 0) {

value *= transaxes[i].scale1;

if (value > 0)

value = AXIS_MIN;

} else {

value *= transaxes[i].scale2;

if (value < 0)

value = AXIS_MAX;

}

change = (value - joystick->axes[i]);

if ((change < -JOY_AXIS_THRESHOLD) || (change > JOY_AXIS_THRESHOLD)) {

SDL_PrivateJoystickAxis (joystick, (Uint8) i, (Sint16) value);

}

}

/* joystick button A to D events */

if (SYS_JoyData[index].id == 1)

corr = 2;

else

corr = 0;

normbut = 4; /* Number of normal buttons */

if (joystick->nbuttons < normbut)

normbut = joystick->nbuttons;

for (i = corr; (i - corr) < normbut; ++i) {

/*

Button A: 1110 0000

Button B: 1101 0000

Button C: 1011 0000

Button D: 0111 0000

*/

if ((~stGameStatus.curdata.butMask) >> 4 & JOY_BUTTON_FLAG (i)) {

if (!joystick->buttons[i - corr]) {

SDL_PrivateJoystickButton (joystick, (Uint8) (i - corr),

SDL_PRESSED);

}

} else {

if (joystick->buttons[i - corr]) {

SDL_PrivateJoystickButton (joystick, (Uint8) (i - corr),

SDL_RELEASED);

}

}

}

/* Joystick button E to H buttons */

/*

Button E: Axis 2 X Left

Button F: Axis 2 Y Up

Button G: Axis 2 X Right

Button H: Axis 2 Y Down

*/

if (joystick->nbuttons >= 5) {

if (stGameStatus.curdata.B.x < SYS_JoyData[index].buttoncalc[0])

SDL_PrivateJoystickButton (joystick, (Uint8) 4, SDL_PRESSED);

else

SDL_PrivateJoystickButton (joystick, (Uint8) 4, SDL_RELEASED);

}

if (joystick->nbuttons >= 6) {

if (stGameStatus.curdata.B.y < SYS_JoyData[index].buttoncalc[1])

SDL_PrivateJoystickButton (joystick, (Uint8) 5, SDL_PRESSED);

else

SDL_PrivateJoystickButton (joystick, (Uint8) 5, SDL_RELEASED);

}

if (joystick->nbuttons >= 7) {

if (stGameStatus.curdata.B.x > SYS_JoyData[index].buttoncalc[2])

SDL_PrivateJoystickButton (joystick, (Uint8) 6, SDL_PRESSED);

else

SDL_PrivateJoystickButton (joystick, (Uint8) 6, SDL_RELEASED);

}

if (joystick->nbuttons >= 8) {

if (stGameStatus.curdata.B.y > SYS_JoyData[index].buttoncalc[3])

SDL_PrivateJoystickButton (joystick, (Uint8) 7, SDL_PRESSED);

else

SDL_PrivateJoystickButton (joystick, (Uint8) 7, SDL_RELEASED);

}

/* joystick hat events */

/* Not Supported under OS/2 */

/* joystick ball events */

/* Not Supported under OS/2 */

}

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

/* Function to close a joystick after use */

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

void

SDL_SYS_JoystickClose (SDL_Joystick * joystick)

{

if (joystick->hwdata != NULL) {

/* free system specific hardware data */

SDL_free (joystick->hwdata);

}

}

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

/* Function to perform any system-specific joystick related cleanup */

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

void

SDL_SYS_JoystickQuit (void)

{

joyPortClose (&hJoyPort);

}

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

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

/* OS/2 Implementations */

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

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

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

/* Open Joystick Port, if not opened yet */

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

APIRET

joyPortOpen (HFILE * hGame)

{

APIRET rc; /* Generic Return Code */

ULONG ulAction; /* ? */

ULONG ulVersion; /* Version of joystick driver */

ULONG ulDataLen; /* Size of version data */

/* Verifies if joyport is not already open... */

if (*hGame != NULL)

return 0;

/* Open GAME$ for read */

rc = DosOpen ((PSZ) GAMEPDDNAME, hGame, &ulAction, 0, FILE_READONLY,

FILE_OPEN, OPEN_ACCESS_READONLY | OPEN_SHARE_DENYNONE,

NULL);

if (rc != 0) {

SDL_SetError ("Could not open Joystick Port.");

return -1;

}

/* Get Joystick Driver Version... must be 2.0 or higher */

ulVersion = 0;

ulDataLen = sizeof (ulVersion);

rc = DosDevIOCtl (*hGame, IOCTL_CAT_USER, GAME_GET_VERSION,

NULL, 0, NULL, &ulVersion, ulDataLen, &ulDataLen);

if (rc != 0) {

joyPortClose (hGame);

SDL_SetError ("Could not get Joystick Driver version.");

return -1;

}

if (ulVersion < GAME_VERSION) {

joyPortClose (hGame);

SDL_SetError

("Driver too old. At least IBM driver version 2.0 required.");

return -1;

}

return 0;

}

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

/* Close JoyPort, if opened */

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

void

joyPortClose (HFILE * hGame)

{

if (*hGame != NULL)

DosClose (*hGame);

*hGame = NULL;

}

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

/* Get SDL Joystick EnvVar */

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

int

joyGetEnv (struct _joycfg *joydata)

{

char *joyenv; /* Pointer to tested character */

char tempnumber[5]; /* Temporary place to put numeric texts */

joyenv = SDL_getenv ("SDL_OS2_JOYSTICK");

if (joyenv == NULL)

return 0;

/* Joystick Environment is defined! */

while (*joyenv == ' ' && *joyenv != 0)

joyenv++; /* jump spaces... */

/* If the string name starts with '... get if fully */

if (*joyenv == '\'')

joyenv +=

joyGetData (++joyenv, joydata->name, '\'',

sizeof (joydata->name));

/* If not, get it until the next space */

else if (*joyenv == '\"')

joyenv +=

joyGetData (++joyenv, joydata->name, '\"',

sizeof (joydata->name));

else

joyenv +=

joyGetData (joyenv, joydata->name, ' ', sizeof (joydata->name));

/* Now get the number of axes */

while (*joyenv == ' ' && *joyenv != 0)

joyenv++; /* jump spaces... */

joyenv += joyGetData (joyenv, tempnumber, ' ', sizeof (tempnumber));

joydata->axes = atoi (tempnumber);

/* Now get the number of buttons */

while (*joyenv == ' ' && *joyenv != 0)

joyenv++; /* jump spaces... */

joyenv += joyGetData (joyenv, tempnumber, ' ', sizeof (tempnumber));

joydata->buttons = atoi (tempnumber);

/* Now get the number of hats */

while (*joyenv == ' ' && *joyenv != 0)

joyenv++; /* jump spaces... */

joyenv += joyGetData (joyenv, tempnumber, ' ', sizeof (tempnumber));

joydata->hats = atoi (tempnumber);

/* Now get the number of balls */

while (*joyenv == ' ' && *joyenv != 0)

joyenv++; /* jump spaces... */

joyenv += joyGetData (joyenv, tempnumber, ' ', sizeof (tempnumber));

joydata->balls = atoi (tempnumber);

return 1;

}

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

/* Get a text from in the string starting in joyenv until it finds */

/* the stopchar or maxchars is reached. The result is placed in name. */

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

int

joyGetData (char *joyenv, char *name, char stopchar, size_t maxchars)

{

char *nameptr; /* Pointer to the selected character */

int chcnt = 0; /* Count how many characters where copied */

nameptr = name;

while (*joyenv != stopchar && *joyenv != 0) {

if (nameptr < (name + (maxchars - 1))) {

*nameptr = *joyenv; /* Only copy if smaller than maximum */

nameptr++;

}

chcnt++;

joyenv++;

}

if (*joyenv == stopchar) {

joyenv++; /* Jump stopchar */

chcnt++;

}

*nameptr = 0; /* Mark last byte */

return chcnt;

}

#endif /* SDL_JOYSTICK_OS2 */

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