Fix various performance issues reported by cppcheck (#5628)

* Also remove 1 non declared but defined functions

src/clientmedia.cpp

@@ -42,12 +42,12 @@ static std::string getMediaCacheDir()
 */
 
 ClientMediaDownloader::ClientMediaDownloader():
-	m_media_cache(getMediaCacheDir())
+	m_media_cache(getMediaCacheDir()),
+	m_initial_step_done(false),
+	m_uncached_count(0),
+	m_uncached_received_count(0),
+	m_name_bound("")
 {
-	m_initial_step_done = false;
-	m_name_bound = "";  // works because "" is an invalid file name
-	m_uncached_count = 0;
-	m_uncached_received_count = 0;
 	m_httpfetch_caller = HTTPFETCH_DISCARD;
 	m_httpfetch_active = 0;
 	m_httpfetch_active_limit = 0;
@@ -69,7 +69,7 @@ ClientMediaDownloader::~ClientMediaDownloader()
 		delete m_remotes[i];
 }
 
-void ClientMediaDownloader::addFile(std::string name, std::string sha1)
+void ClientMediaDownloader::addFile(const std::string &name, const std::string &sha1)
 {
 	assert(!m_initial_step_done); // pre-condition
 
@@ -104,7 +104,7 @@ void ClientMediaDownloader::addFile(std::string name, std::string sha1)
 	m_files.insert(std::make_pair(name, filestatus));
 }
 
-void ClientMediaDownloader::addRemoteServer(std::string baseurl)
+void ClientMediaDownloader::addRemoteServer(const std::string &baseurl)
 {
 	assert(!m_initial_step_done);	// pre-condition
 

src/clientmedia.h

@@ -58,10 +58,10 @@ public:
 	}
 
 	// Add a file to the list of required file (but don't fetch it yet)
-	void addFile(std::string name, std::string sha1);
+	void addFile(const std::string &name, const std::string &sha1);
 
 	// Add a remote server to the list; ignored if not built with cURL
-	void addRemoteServer(std::string baseurl);
+	void addRemoteServer(const std::string &baseurl);
 
 	// Steps the media downloader:
 	// - May load media into client by calling client->loadMedia()

src/guiEngine.cpp

@@ -60,7 +60,7 @@ void TextDestGuiEngine::gotText(const StringMap &fields)
 }
 
 /******************************************************************************/
-void TextDestGuiEngine::gotText(std::wstring text)
+void TextDestGuiEngine::gotText(const std::wstring &text)
 {
 	m_engine->getScriptIface()->handleMainMenuEvent(wide_to_utf8(text));
 }
@@ -540,7 +540,7 @@ bool GUIEngine::setTexture(texture_layer layer, std::string texturepath,
 }
 
 /******************************************************************************/
-bool GUIEngine::downloadFile(std::string url, std::string target)
+bool GUIEngine::downloadFile(const std::string &url, const std::string &target)
 {
 #if USE_CURL
 	std::ofstream target_file(target.c_str(), std::ios::out | std::ios::binary);

src/guiEngine.h

@@ -80,7 +80,7 @@ public:
 	 * receive text/events transmitted by guiFormSpecMenu
 	 * @param text textual representation of event
 	 */
-	void gotText(std::wstring text);
+	void gotText(const std::wstring &text);
 
 private:
 	/** target to transmit data to */
@@ -260,14 +260,11 @@ private:
 	 * @param url url to download
 	 * @param target file to store to
 	 */
-	static bool downloadFile(std::string url,std::string target);
+	static bool downloadFile(const std::string &url, const std::string &target);
 
 	/** array containing pointers to current specified texture layers */
 	image_definition m_textures[TEX_LAYER_MAX];
 
-	/** draw version string in topleft corner */
-	void drawVersion();
-
 	/**
 	 * specify text to appear as top left string
 	 * @param text to set

src/guiFormSpecMenu.h

@@ -78,22 +78,19 @@ class GUIFormSpecMenu : public GUIModalMenu
 {
 	struct ItemSpec
 	{
-		ItemSpec()
-		{
-			i = -1;
-		}
+		ItemSpec() :
+			i(-1)
+		{}
+
 		ItemSpec(const InventoryLocation &a_inventoryloc,
 				const std::string &a_listname,
-				s32 a_i)
-		{
-			inventoryloc = a_inventoryloc;
-			listname = a_listname;
-			i = a_i;
-		}
-		bool isValid() const
-		{
-			return i != -1;
-		}
+				s32 a_i) :
+			inventoryloc(a_inventoryloc),
+			listname(a_listname),
+			i(a_i)
+		{}
+
+		bool isValid() const { return i != -1; }
 
 		InventoryLocation inventoryloc;
 		std::string listname;
@@ -208,14 +205,13 @@ class GUIFormSpecMenu : public GUIModalMenu
 				const std::wstring &default_text, int id) :
 			fname(name),
 			flabel(label),
+			fdefault(unescape_enriched(default_text)),
 			fid(id),
 			send(false),
 			ftype(f_Unknown),
 			is_exit(false)
-		{
-			//flabel = unescape_enriched(label);
-			fdefault = unescape_enriched(default_text);
-		}
+		{}
+
 		std::string fname;
 		std::wstring flabel;
 		std::wstring fdefault;
@@ -239,17 +235,14 @@ class GUIFormSpecMenu : public GUIModalMenu
 	};
 
 	struct TooltipSpec {
-		TooltipSpec()
-		{
-		}
+		TooltipSpec() {}
 		TooltipSpec(std::string a_tooltip, irr::video::SColor a_bgcolor,
 				irr::video::SColor a_color):
+			tooltip(utf8_to_wide(a_tooltip)),
 			bgcolor(a_bgcolor),
 			color(a_color)
-		{
-			//tooltip = unescape_enriched(utf8_to_wide(a_tooltip));
-			tooltip = utf8_to_wide(a_tooltip);
-		}
+		{}
+
 		std::wstring tooltip;
 		irr::video::SColor bgcolor;
 		irr::video::SColor color;
@@ -271,12 +264,11 @@ class GUIFormSpecMenu : public GUIModalMenu
 		StaticTextSpec(const std::wstring &a_text,
 				const core::rect<s32> &a_rect,
 				gui::IGUIButton *a_parent_button):
+			text(a_text),
 			rect(a_rect),
 			parent_button(a_parent_button)
-		{
-			//text = unescape_enriched(a_text);
-			text = a_text;
-		}
+		{}
+
 		std::wstring text;
 		core::rect<s32> rect;
 		gui::IGUIButton *parent_button;
@@ -550,22 +542,19 @@ private:
 class FormspecFormSource: public IFormSource
 {
 public:
-	FormspecFormSource(const std::string &formspec)
-	{
-		m_formspec = formspec;
-	}
+	FormspecFormSource(const std::string &formspec):
+		m_formspec(formspec)
+	{}
 
 	~FormspecFormSource()
 	{}
 
-	void setForm(const std::string &formspec) {
+	void setForm(const std::string &formspec)
+	{
 		m_formspec = FORMSPEC_VERSION_STRING + formspec;
 	}
 
-	std::string getForm()
-	{
-		return m_formspec;
-	}
+	std::string getForm() { return m_formspec; }
 
 	std::string m_formspec;
 };

src/network/connection.cpp

@@ -930,7 +930,7 @@ void Peer::DecUseCount()
 	delete this;
 }
 
-void Peer::RTTStatistics(float rtt, std::string profiler_id,
+void Peer::RTTStatistics(float rtt, const std::string &profiler_id,
 		unsigned int num_samples) {
 
 	if (m_last_rtt > 0) {
@@ -969,8 +969,7 @@ void Peer::RTTStatistics(float rtt, std::string profiler_id,
 			m_rtt.jitter_avg  = m_rtt.jitter_avg * (num_samples/(num_samples-1)) +
 								jitter * (1/num_samples);
 
-		if (profiler_id != "")
-		{
+		if (profiler_id != "") {
 			g_profiler->graphAdd(profiler_id + "_rtt", rtt);
 			g_profiler->graphAdd(profiler_id + "_jitter", jitter);
 		}

src/network/connection.h

@@ -732,8 +732,8 @@ class Peer {
 		virtual void reportRTT(float rtt) {};
 
 		void RTTStatistics(float rtt,
-							std::string profiler_id="",
-							unsigned int num_samples=1000);
+							const std::string &profiler_id = "",
+							unsigned int num_samples = 1000);
 
 		bool IncUseCount();
 		void DecUseCount();

src/settings.h

@@ -74,24 +74,21 @@ struct ValueSpec {
 };
 
 struct SettingsEntry {
-	SettingsEntry()
-	{
-		group    = NULL;
-		is_group = false;
-	}
-
-	SettingsEntry(const std::string &value_)
-	{
-		value    = value_;
-		group    = NULL;
-		is_group = false;
-	}
-
-	SettingsEntry(Settings *group_)
-	{
-		group    = group_;
-		is_group = true;
-	}
+	SettingsEntry() :
+		group(NULL),
+		is_group(false)
+	{}
+
+	SettingsEntry(const std::string &value_) :
+		value(value_),
+		group(NULL),
+		is_group(false)
+	{}
+
+	SettingsEntry(Settings *group_) :
+		group(group_),
+		is_group(true)
+	{}
 
 	std::string value;
 	Settings *group;