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/*
* jsi (Joystick interface) c libray
*/
#include "jsi.h"
int jsi_get_joystick(int joy_num, jsi_joystick * joystick_data) {
int fd;
char dev_path[NAME_MAX];
// Format path.
snprintf(dev_path, sizeof(dev_path), "/dev/input/js%d", joy_num);
fd = open(dev_path, O_RDONLY);
if (fd == -1)
return -1;
joystick_data->fd = fd;
joystick_data->num = joy_num;
joystick_data->joystick_count_init = jsi_joy_count();
// Get axes.
char num_of_axes;
if (ioctl(fd, JSIOCGAXES, &num_of_axes) == -1)
return -1;
joystick_data->layout.axes = (int)num_of_axes;
// Get buttons.
char num_of_buttons;
if (ioctl(fd, JSIOCGBUTTONS, &num_of_buttons) == -1)
return -1;
joystick_data->layout.buttons = (int)num_of_buttons;
// Get name.
char joy_name[JSI_NAME_MAX];
if (ioctl(fd, JSIOCGNAME(JSI_NAME_MAX), joy_name) == -1)
return -1;
strncat(joystick_data->layout.name, joy_name, JSI_NAME_MAX);
return 0;
}
void jsi_close_joystick(jsi_joystick joystick_data) {
close(joystick_data.fd);
}
int jsi_joy_count() {
int joy_count = 0;
char dev_path[NAME_MAX];
struct stat dev_stat;
while (1) {
// Format path.
snprintf(dev_path, sizeof(dev_path), "/dev/input/js%d", joy_count);
if (stat(dev_path, &dev_stat) == -1)
return joy_count;
joy_count++;
}
return joy_count;
}
int jsi_get_event(jsi_joystick joystick_data, struct jsi_event * event_data) {
struct js_event jse;
if (read(joystick_data.fd, &jse, sizeof(jse)) == -1)
return -1;
event_data->value = (int)jse.value;
event_data->type = (int)jse.type;
event_data->num = (int)jse.number;
return 0;
}
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