SDL_JoystickGUID SDL_SYS_JoystickGetDeviceGUID( int device_index )
{
SDL_JoystickGUID guid;
/* the GUID is just the first 16 chars of the name for now */
const char *name = SDL_SYS_JoystickNameForDeviceIndex( device_index );
SDL_zero( guid );
SDL_memcpy( &guid, name, SDL_min( sizeof(guid), SDL_strlen( name ) ) );
return guid;
}
/*
* Get the implementation dependent name of a joystick
*/
const char *
SDL_JoystickNameForIndex(int device_index)
{
if (device_index < 0 || device_index >= SDL_NumJoysticks()) {
SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());
return (NULL);
}
return (SDL_SYS_JoystickNameForDeviceIndex(device_index));
}
static int
CountLogicalJoysticks(int max)
{
register int i, j, k, ret, prev;
const char *name;
int nbuttons, fd;
unsigned char n;
ret = 0;
for (i = 0; i < max; i++) {
name = SDL_SYS_JoystickNameForDeviceIndex(i);
fd = open(SDL_joylist[i].fname, O_RDONLY, 0);
if (fd >= 0) {
if (ioctl(fd, JSIOCGBUTTONS, &n) < 0) {
nbuttons = -1;
} else {
nbuttons = n;
}
close(fd);
} else {
nbuttons = -1;
}
if (name) {
for (j = 0; j < SDL_arraysize(joystick_logicalmap); j++) {
if (!SDL_strcmp(name, joystick_logicalmap[j].name)
&& (nbuttons == -1
|| nbuttons == joystick_logicalmap[j].nbuttons)) {
prev = i;
SDL_joylist[prev].map = &(joystick_logicalmap[j]);
for (k = 1; k < joystick_logicalmap[j].njoys; k++) {
SDL_joylist[prev].next = max + ret;
SDL_joylist[max + ret].prev = prev;
prev = max + ret;
SDL_joylist[prev].logicalno = k;
SDL_joylist[prev].map = &(joystick_logicalmap[j]);
ret++;
}
break;
}
}
}
}
return ret;
}
/*
* Open a joystick for use - the index passed as an argument refers to
* the N'th joystick on the system. This index is the value which will
* identify this joystick in future joystick events.
*
* This function returns a joystick identifier, or NULL if an error occurred.
*/
SDL_Joystick *
SDL_JoystickOpen(int device_index)
{
SDL_Joystick *joystick;
SDL_Joystick *joysticklist;
const char *joystickname = NULL;
if ((device_index < 0) || (device_index >= SDL_NumJoysticks())) {
SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());
return (NULL);
}
SDL_LockJoystickList();
joysticklist = SDL_joysticks;
/* If the joystick is already open, return it
* it is important that we have a single joystick * for each instance id
*/
while (joysticklist) {
if (SDL_JoystickGetDeviceInstanceID(device_index) == joysticklist->instance_id) {
joystick = joysticklist;
++joystick->ref_count;
SDL_UnlockJoystickList();
return (joystick);
}
joysticklist = joysticklist->next;
}
/* Create and initialize the joystick */
joystick = (SDL_Joystick *) SDL_calloc(sizeof(*joystick), 1);
if (joystick == NULL) {
SDL_OutOfMemory();
SDL_UnlockJoystickList();
return NULL;
}
if (SDL_SYS_JoystickOpen(joystick, device_index) < 0) {
SDL_free(joystick);
SDL_UnlockJoystickList();
return NULL;
}
joystickname = SDL_SYS_JoystickNameForDeviceIndex(device_index);
if (joystickname)
joystick->name = SDL_strdup(joystickname);
else
joystick->name = NULL;
if (joystick->naxes > 0) {
joystick->axes = (SDL_JoystickAxisInfo *) SDL_calloc(joystick->naxes, sizeof(SDL_JoystickAxisInfo));
}
if (joystick->nhats > 0) {
joystick->hats = (Uint8 *) SDL_calloc(joystick->nhats, sizeof(Uint8));
}
if (joystick->nballs > 0) {
joystick->balls = (struct balldelta *) SDL_calloc(joystick->nballs, sizeof(*joystick->balls));
}
if (joystick->nbuttons > 0) {
joystick->buttons = (Uint8 *) SDL_calloc(joystick->nbuttons, sizeof(Uint8));
}
if (((joystick->naxes > 0) && !joystick->axes)
|| ((joystick->nhats > 0) && !joystick->hats)
|| ((joystick->nballs > 0) && !joystick->balls)
|| ((joystick->nbuttons > 0) && !joystick->buttons)) {
SDL_OutOfMemory();
SDL_JoystickClose(joystick);
SDL_UnlockJoystickList();
return NULL;
}
joystick->epowerlevel = SDL_JOYSTICK_POWER_UNKNOWN;
/* If this joystick is known to have all zero centered axes, skip the auto-centering code */
if (SDL_JoystickAxesCenteredAtZero(joystick)) {
int i;
for (i = 0; i < joystick->naxes; ++i) {
joystick->axes[i].has_initial_value = SDL_TRUE;
}
}
joystick->is_game_controller = SDL_IsGameController(device_index);
/* Add joystick to list */
++joystick->ref_count;
/* Link the joystick in the list */
joystick->next = SDL_joysticks;
SDL_joysticks = joystick;
SDL_UnlockJoystickList();
SDL_SYS_JoystickUpdate(joystick);
return (joystick);
}
/*
* Open a joystick for use - the index passed as an argument refers to
* the N'th joystick on the system. This index is the value which will
* identify this joystick in future joystick events.
*
* This function returns a joystick identifier, or NULL if an error occurred.
*/
SDL_Joystick *
SDL_JoystickOpen(int device_index)
{
SDL_Joystick *joystick;
SDL_Joystick *joysticklist;
const char *joystickname = NULL;
if ((device_index < 0) || (device_index >= SDL_NumJoysticks())) {
SDL_SetError("There are %d joysticks available", SDL_NumJoysticks());
return (NULL);
}
joysticklist = SDL_joysticks;
/* If the joystick is already open, return it
* it is important that we have a single joystick * for each instance id
*/
while (joysticklist) {
if (SDL_SYS_GetInstanceIdOfDeviceIndex(device_index) == joysticklist->instance_id) {
joystick = joysticklist;
++joystick->ref_count;
return (joystick);
}
joysticklist = joysticklist->next;
}
/* Create and initialize the joystick */
joystick = (SDL_Joystick *) SDL_malloc((sizeof *joystick));
if (joystick == NULL) {
SDL_OutOfMemory();
return NULL;
}
SDL_memset(joystick, 0, (sizeof *joystick));
if (SDL_SYS_JoystickOpen(joystick, device_index) < 0) {
SDL_free(joystick);
return NULL;
}
joystickname = SDL_SYS_JoystickNameForDeviceIndex(device_index);
if (joystickname)
joystick->name = SDL_strdup(joystickname);
else
joystick->name = NULL;
if (joystick->naxes > 0) {
joystick->axes = (Sint16 *) SDL_malloc(joystick->naxes * sizeof(Sint16));
joystick->axes_zero = (Sint16 *) SDL_malloc(joystick->naxes * sizeof(Sint16));
}
if (joystick->nhats > 0) {
joystick->hats = (Uint8 *) SDL_malloc
(joystick->nhats * sizeof(Uint8));
}
if (joystick->nballs > 0) {
joystick->balls = (struct balldelta *) SDL_malloc
(joystick->nballs * sizeof(*joystick->balls));
}
if (joystick->nbuttons > 0) {
joystick->buttons = (Uint8 *) SDL_malloc
(joystick->nbuttons * sizeof(Uint8));
}
if (((joystick->naxes > 0) && !joystick->axes)
|| ((joystick->nhats > 0) && !joystick->hats)
|| ((joystick->nballs > 0) && !joystick->balls)
|| ((joystick->nbuttons > 0) && !joystick->buttons)) {
SDL_OutOfMemory();
SDL_JoystickClose(joystick);
return NULL;
}
if (joystick->axes) {
SDL_memset(joystick->axes, 0, joystick->naxes * sizeof(Sint16));
SDL_memset(joystick->axes_zero, 0, joystick->naxes * sizeof(Sint16));
}
if (joystick->hats) {
SDL_memset(joystick->hats, 0, joystick->nhats * sizeof(Uint8));
}
if (joystick->balls) {
SDL_memset(joystick->balls, 0,
joystick->nballs * sizeof(*joystick->balls));
}
if (joystick->buttons) {
SDL_memset(joystick->buttons, 0, joystick->nbuttons * sizeof(Uint8));
}
joystick->epowerlevel = SDL_JOYSTICK_POWER_UNKNOWN;
/* Add joystick to list */
++joystick->ref_count;
/* Link the joystick in the list */
joystick->next = SDL_joysticks;
SDL_joysticks = joystick;
SDL_SYS_JoystickUpdate(joystick);
return (joystick);
}
static SDL_bool
JS_ConfigJoystick(SDL_Joystick * joystick, int fd)
{
SDL_bool handled;
unsigned char n;
int tmp_naxes, tmp_nhats, tmp_nballs;
const char *name;
char *env, env_name[128];
int i;
handled = SDL_FALSE;
/* Default joystick device settings */
if (ioctl(fd, JSIOCGAXES, &n) < 0) {
joystick->naxes = 2;
} else {
joystick->naxes = n;
}
if (ioctl(fd, JSIOCGBUTTONS, &n) < 0) {
joystick->nbuttons = 2;
} else {
joystick->nbuttons = n;
}
name = SDL_SYS_JoystickNameForDeviceIndex(joystick->instance_id);
/* Generic analog joystick support */
if (SDL_strstr(name, "Analog") == name && SDL_strstr(name, "-hat")) {
if (SDL_sscanf(name, "Analog %d-axis %*d-button %d-hat",
&tmp_naxes, &tmp_nhats) == 2) {
joystick->naxes = tmp_naxes;
joystick->nhats = tmp_nhats;
handled = SDL_TRUE;
}
}
/* Special joystick support */
for (i = 0; i < SDL_arraysize(special_joysticks); ++i) {
if (SDL_strcmp(name, special_joysticks[i].name) == 0) {
joystick->naxes = special_joysticks[i].naxes;
joystick->nhats = special_joysticks[i].nhats;
joystick->nballs = special_joysticks[i].nballs;
handled = SDL_TRUE;
break;
}
}
/* User environment joystick support */
if ((env = SDL_getenv("SDL_LINUX_JOYSTICK"))) {
*env_name = '\0';
if (*env == '\'' && SDL_sscanf(env, "'%[^']s'", env_name) == 1)
env += SDL_strlen(env_name) + 2;
else if (SDL_sscanf(env, "%s", env_name) == 1)
env += SDL_strlen(env_name);
if (SDL_strcmp(name, env_name) == 0) {
if (SDL_sscanf(env, "%d %d %d", &tmp_naxes, &tmp_nhats,
&tmp_nballs) == 3) {
joystick->naxes = tmp_naxes;
joystick->nhats = tmp_nhats;
joystick->nballs = tmp_nballs;
handled = SDL_TRUE;
}
}
}
/* Remap hats and balls */
if (handled) {
if (joystick->nhats > 0) {
if (allocate_hatdata(joystick) < 0) {
joystick->nhats = 0;
}
}
if (joystick->nballs > 0) {
if (allocate_balldata(joystick) < 0) {
joystick->nballs = 0;
}
}
}
return (handled);
}
