Remove unnecessary file existence check in GMenu2X -> InputManager

Instead of checking which input configuration file exists among 2
choices, then asking InputManager to load that file, InputManager
itself now performs the resolution based on whether ifstream::is_open
returns true for each choice.

src/gmenu2x.cpp

@@ -279,18 +279,10 @@ GMenu2X::GMenu2X()
 	monitor = new MediaMonitor(CARD_ROOT);
 #endif
 
-	/* If a user-specified input.conf file exists, we load it;
+	if (!input.init(this, menu.get())) {
-	 * otherwise, we load the default one. */
+		exit(EXIT_FAILURE);
-	string input_file = getHome() + "/input.conf";
-	if (fileExists(input_file.c_str())) {
-		DEBUG("Loading user-specific input.conf file: %s.\n", input_file.c_str());
-	} else {
-		input_file = GMENU2X_SYSTEM_DIR "/input.conf";
-		DEBUG("Loading system input.conf file: %s.\n", input_file.c_str());
 	}
 
-	input.init(this, input_file, menu.get());
-
 	if (confInt["backlightTimeout"] > 0)
         PowerSaver::getInstance()->setScreenTimeout( confInt["backlightTimeout"] );
 #ifdef ENABLE_CPUFREQ

src/inputmanager.cpp

@@ -30,7 +30,7 @@
 
 using namespace std;
 
-void InputManager::init(GMenu2X *gmenu2x, const string &conffile, Menu *menu) {
+bool InputManager::init(GMenu2X *gmenu2x, Menu *menu) {
 	this->gmenu2x = gmenu2x;
 	this->menu = menu;
 
@@ -40,7 +40,21 @@ void InputManager::init(GMenu2X *gmenu2x, const string &conffile, Menu *menu) {
 		buttonMap[i].js_mapped = false;
 		buttonMap[i].kb_mapped = false;
 	}
-	readConfFile(conffile);
+
+	/* If a user-specified input.conf file exists, we load it;
+	 * otherwise, we load the default one. */
+	string input_file = gmenu2x->getHome() + "/input.conf";
+	DEBUG("Loading user-specific input.conf file: %s.\n", input_file.c_str());
+	if (!readConfFile(input_file)) {
+		input_file = GMENU2X_SYSTEM_DIR "/input.conf";
+		DEBUG("Loading system input.conf file: %s.\n", input_file.c_str());
+		if (!readConfFile(input_file)) {
+			ERROR("InputManager: failed to open config file\n");
+			return false;
+		}
+	}
+
+	return true;
 }
 
 InputManager::InputManager()
@@ -73,13 +87,9 @@ InputManager::~InputManager()
 #endif
 }
 
-void InputManager::readConfFile(const string &conffile) {
+bool InputManager::readConfFile(const string &conffile) {
 	ifstream inf(conffile.c_str(), ios_base::in);
-	if (inf.fail()) {
+	if (inf.is_open()) {
-		ERROR("InputManager: failed to open config file\n");
-		return;
-	}
-
 		string line;
 		while (getline(inf, line, '\n')) {
 			string::size_type pos = line.find("=");
@@ -110,11 +120,11 @@ void InputManager::readConfFile(const string &conffile) {
 			if (sourceStr == "keyboard") {
 				buttonMap[button].kb_mapped = true;
 				buttonMap[button].kb_code = atoi(line.c_str());
-#ifndef SDL_JOYSTICK_DISABLED
+	#ifndef SDL_JOYSTICK_DISABLED
 			} else if (sourceStr == "joystick") {
 				buttonMap[button].js_mapped = true;
 				buttonMap[button].js_code = atoi(line.c_str());
-#endif
+	#endif
 			} else {
 				WARNING("InputManager: Ignoring unknown button source \"%s\"\n",
 						sourceStr.c_str());
@@ -123,6 +133,10 @@ void InputManager::readConfFile(const string &conffile) {
 		}
 
 		inf.close();
+		return true;
+	} else {
+		return false;
+	}
 }
 
 InputManager::Button InputManager::waitForPressedButton() {

src/inputmanager.h

@@ -64,7 +64,7 @@ public:
 	InputManager();
 	~InputManager();
 
-	void init(GMenu2X *gmenu2x, const std::string &conffile, Menu *menu);
+	bool init(GMenu2X *gmenu2x, Menu *menu);
 	Button waitForPressedButton();
 	void repeatRateChanged();
 	Uint32 joystickRepeatCallback(Uint32 timeout, struct Joystick *joystick);
@@ -72,7 +72,7 @@ public:
 	bool getButton(Button *button, bool wait);
 
 private:
-	void readConfFile(const std::string &conffile);
+	bool readConfFile(const std::string &conffile);
 
 	struct ButtonMapEntry {
 		bool kb_mapped, js_mapped;