some XML parsing cleanups (danmar#6515)

Author: firewave

cli/cmdlineparser.cpp

@@ -1157,33 +1157,35 @@ CmdLineParser::Result CmdLineParser::parseFromArgs(int argc, const char* const a
                         Settings::Rule rule;
 
                         for (const tinyxml2::XMLElement *subnode = node->FirstChildElement(); subnode; subnode = subnode->NextSiblingElement()) {
+                            const char * const subname = subnode->Name();
                             const char * const subtext = subnode->GetText();
-                            if (std::strcmp(subnode->Name(), "tokenlist") == 0) {
+                            if (std::strcmp(subname, "tokenlist") == 0) {
                                 rule.tokenlist = empty_if_null(subtext);
                             }
-                            else if (std::strcmp(subnode->Name(), "pattern") == 0) {
+                            else if (std::strcmp(subname, "pattern") == 0) {
                                 rule.pattern = empty_if_null(subtext);
                             }
-                            else if (std::strcmp(subnode->Name(), "message") == 0) {
+                            else if (std::strcmp(subname, "message") == 0) {
                                 for (const tinyxml2::XMLElement *msgnode = subnode->FirstChildElement(); msgnode; msgnode = msgnode->NextSiblingElement()) {
+                                    const char * const msgname = msgnode->Name();
                                     const char * const msgtext = msgnode->GetText();
-                                    if (std::strcmp(msgnode->Name(), "severity") == 0) {
+                                    if (std::strcmp(msgname, "severity") == 0) {
                                         rule.severity = severityFromString(empty_if_null(msgtext));
                                     }
-                                    else if (std::strcmp(msgnode->Name(), "id") == 0) {
+                                    else if (std::strcmp(msgname, "id") == 0) {
                                         rule.id = empty_if_null(msgtext);
                                     }
-                                    else if (std::strcmp(msgnode->Name(), "summary") == 0) {
+                                    else if (std::strcmp(msgname, "summary") == 0) {
                                         rule.summary = empty_if_null(msgtext);
                                     }
                                     else {
-                                        mLogger.printError("unable to load rule-file '" + ruleFile + "' - unknown element '" + msgnode->Name() + "' encountered in 'message'.");
+                                        mLogger.printError("unable to load rule-file '" + ruleFile + "' - unknown element '" + msgname + "' encountered in 'message'.");
                                         return Result::Fail;
                                     }
                                 }
                             }
                             else {
-                                mLogger.printError("unable to load rule-file '" + ruleFile + "' - unknown element '" + subnode->Name() + "' encountered in 'rule'.");
+                                mLogger.printError("unable to load rule-file '" + ruleFile + "' - unknown element '" + subname + "' encountered in 'rule'.");
                                 return Result::Fail;
                             }
                         }

lib/checkbufferoverrun.cpp

@@ -966,9 +966,10 @@ Check::FileInfo * CheckBufferOverrun::loadFileInfoFromXml(const tinyxml2::XMLEle
 
     auto *fileInfo = new MyFileInfo;
     for (const tinyxml2::XMLElement *e = xmlElement->FirstChildElement(); e; e = e->NextSiblingElement()) {
-        if (e->Name() == arrayIndex)
+        const char* name = e->Name();
+        if (name == arrayIndex)
             fileInfo->unsafeArrayIndex = CTU::loadUnsafeUsageListFromXml(e);
-        else if (e->Name() == pointerArith)
+        else if (name == pointerArith)
             fileInfo->unsafePointerArith = CTU::loadUnsafeUsageListFromXml(e);
     }
 

lib/checkunusedfunctions.cpp

@@ -450,11 +450,12 @@ void CheckUnusedFunctions::analyseWholeProgram(const Settings &settings, ErrorLo
                 const char* functionName = e2->Attribute("functionName");
                 if (functionName == nullptr)
                     continue;
-                if (std::strcmp(e2->Name(),"functioncall") == 0) {
+                const char* name = e2->Name();
+                if (std::strcmp(name,"functioncall") == 0) {
                     calls.insert(functionName);
                     continue;
                 }
-                if (std::strcmp(e2->Name(),"functiondecl") == 0) {
+                if (std::strcmp(name,"functiondecl") == 0) {
                     const char* lineNumber = e2->Attribute("lineNumber");
                     if (lineNumber) {
                         // cppcheck-suppress templateInstantiation - TODO: fix this - see #11631

lib/ctu.cpp

@@ -172,7 +172,7 @@ static std::string readAttrString(const tinyxml2::XMLElement *e, const char *att
     const char *value = e->Attribute(attr);
     if (!value && error)
         *error = true;
-    return value ? value : "";
+    return empty_if_null(value);
 }
 
 static long long readAttrInt(const tinyxml2::XMLElement *e, const char *attr, bool *error)
@@ -232,11 +232,12 @@ bool CTU::FileInfo::NestedCall::loadFromXml(const tinyxml2::XMLElement *xmlEleme
 void CTU::FileInfo::loadFromXml(const tinyxml2::XMLElement *xmlElement)
 {
     for (const tinyxml2::XMLElement *e = xmlElement->FirstChildElement(); e; e = e->NextSiblingElement()) {
-        if (std::strcmp(e->Name(), "function-call") == 0) {
+        const char* name = e->Name();
+        if (std::strcmp(name, "function-call") == 0) {
             FunctionCall functionCall;
             if (functionCall.loadFromXml(e))
                 functionCalls.push_back(std::move(functionCall));
-        } else if (std::strcmp(e->Name(), "nested-call") == 0) {
+        } else if (std::strcmp(name, "nested-call") == 0) {
             NestedCall nestedCall;
             if (nestedCall.loadFromXml(e))
                 nestedCalls.push_back(std::move(nestedCall));

lib/errorlogger.cpp

@@ -190,7 +190,8 @@ ErrorMessage::ErrorMessage(const tinyxml2::XMLElement * const errmsg)
     hash = attr ? strToInt<std::size_t>(attr) : 0;
 
     for (const tinyxml2::XMLElement *e = errmsg->FirstChildElement(); e; e = e->NextSiblingElement()) {
-        if (std::strcmp(e->Name(),"location")==0) {
+        const char* name = e->Name();
+        if (std::strcmp(name,"location")==0) {
             const char *strfile = e->Attribute("file");
             const char *strinfo = e->Attribute("info");
             const char *strline = e->Attribute("line");
@@ -201,7 +202,7 @@ ErrorMessage::ErrorMessage(const tinyxml2::XMLElement * const errmsg)
             const int line = strline ? strToInt<int>(strline) : 0;
             const int column = strcolumn ? strToInt<int>(strcolumn) : 0;
             callStack.emplace_front(file, info, line, column);
-        } else if (std::strcmp(e->Name(),"symbol")==0) {
+        } else if (std::strcmp(name,"symbol")==0) {
             mSymbolNames += e->GetText();
         }
     }