1 files changed, 83 insertions, 0 deletions
diff --git a/jsi/src/jsi.c b/jsi/src/jsi.c
new file mode 100644
index 0000000..1a9f44d
--- /dev/null
+++ b/jsi/src/jsi.c
@@ -0,0 +1,83 @@
+/*
+ * 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;
+}