Enumerate available game controllers

[libs/gui.git] / source / input / linux / gamecontroller.cpp

diff --git a/source/input/linux/gamecontroller.cpp b/source/input/linux/gamecontroller.cpp
index 2fc624e7b83db87e677c0c2bbe5fdda0fb0ccd53..c00379d4c70e9e595c0c1257a7ac92881f574861 100644 (file)
--- a/source/input/linux/gamecontroller.cpp
+++ b/source/input/linux/gamecontroller.cpp
@@ -1,6 +1,7 @@
 #include <fcntl.h>
 #include <linux/joystick.h>
 #include <msp/core/systemerror.h>
+#include <msp/fs/dir.h>
 #include <msp/io/handle_private.h>
 #include <msp/strings/format.h>
 #include "gamecontroller.h"
@@ -11,10 +12,17 @@ using namespace std;
 namespace Msp {
 namespace Input {
 
+vector<string> GameController::Private::detected_controllers;
+
 GameController::GameController(unsigned index):
        event_disp(0)
 {
-       JsDevice *device = new JsDevice(format("/dev/input/js%d", index));
+       if(!detect_done)
+               detect();
+       if(index>=Private::detected_controllers.size())
+               throw device_not_available(format("GameController(%d)", index));
+
+       JsDevice *device = new JsDevice(Private::detected_controllers[index]);
 
        priv = new Private;
        priv->dev = device;
@@ -29,6 +37,22 @@ GameController::~GameController()
        delete priv;
 }
 
+unsigned GameController::detect()
+{
+       Private::detected_controllers.clear();
+
+       FS::Path dev_input = "/dev/input";
+       list<string> devices = FS::list_filtered(dev_input, "^js[0-9]+");
+       for(list<string>::const_iterator i=devices.begin(); i!=devices.end(); ++i)
+               // TODO check permissions
+               Private::detected_controllers.push_back((dev_input / *i).str());
+
+       detect_done = true;
+       n_detected_controllers = Private::detected_controllers.size();
+
+       return Private::detected_controllers.size();
+}
+
 void GameController::use_event_dispatcher(IO::EventDispatcher *ed)
 {
        if(event_disp)