Fix #10888 FN variableScope with enum and struct (#3920)

* Fix #10888 FN variableScope with enum and struct

* Scope reduction

* Scope reduction

lib/checkother.cpp

@@ -914,10 +914,12 @@ void CheckOther::checkVariableScope()
         return;
 
     for (const Variable* var : symbolDatabase->variableList()) {
-        if (!var || !var->isLocal() || (!var->isPointer() && !var->isReference() && !var->typeStartToken()->isStandardType()))
+        if (!var || !var->isLocal() || var->isConst())
             continue;
 
-        if (var->isConst())
+        const bool isPtrOrRef = var->isPointer() || var->isReference();
+        const bool isSimpleType = var->typeStartToken()->isStandardType() || var->typeStartToken()->isEnumType() || (mTokenizer->isC() && var->type() && var->type()->isStructType());
+        if (!isPtrOrRef && !isSimpleType && !astIsContainer(var->nameToken()))
             continue;
 
         if (mTokenizer->hasIfdef(var->nameToken(), var->scope()->bodyEnd))

lib/valueflow.cpp

@@ -1737,10 +1737,11 @@ static const std::string& invertAssign(const std::string& assign)
         {"<<=", ">>="},
         {">>=", "<<="},
         {"^=", "^="}};
-    static std::string empty;
     auto it = lookup.find(assign);
-    if (it == lookup.end())
+    if (it == lookup.end()) {
+        static std::string empty;
         return empty;
+    }
     else
         return it->second;
 }
@@ -2988,8 +2989,8 @@ std::string lifetimeMessage(const Token *tok, const ValueFlow::Value *val, Error
         if (!classVar)
             errorPath.emplace_back(vartok, "Variable created here.");
         const Variable * var = vartok->variable();
-        std::string submessage;
         if (var) {
+            std::string submessage;
             switch (val->lifetimeKind) {
             case ValueFlow::Value::LifetimeKind::SubObject:
             case ValueFlow::Value::LifetimeKind::Object:

test/testother.cpp

@@ -96,6 +96,7 @@ private:
         TEST_CASE(varScope26);      // range for loop, map
         TEST_CASE(varScope27);      // #7733 - #if
         TEST_CASE(varScope28);      // #10527
+        TEST_CASE(varScope29);      // #10888
 
         TEST_CASE(oldStylePointerCast);
         TEST_CASE(invalidPointerCast);
@@ -1320,6 +1321,32 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void varScope29() { // #10888
+        check("enum E { E0 };\n"
+              "struct S { int i; };\n"
+              "void f(int b) {\n"
+              "    enum E e;\n"
+              "    struct S s;\n"
+              "    if (b) {\n"
+              "        e = E0;\n"
+              "        s.i = 0;\n"
+              "        g(e, s);\n"
+              "    }\n"
+              "}\n", "test.c");
+        ASSERT_EQUALS("[test.c:4]: (style) The scope of the variable 'e' can be reduced.\n"
+                      "[test.c:5]: (style) The scope of the variable 's' can be reduced.\n",
+                      errout.str());
+
+        check("void f(bool b) {\n"
+              "    std::string s;\n"
+              "    if (b) {\n"
+              "        s = \"abc\";\n"
+              "        g(s);\n"
+              "    }\n"
+              "}");
+        ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 's' can be reduced.\n", errout.str());
+    }
+
 #define checkOldStylePointerCast(code) checkOldStylePointerCast_(code, __FILE__, __LINE__)
     void checkOldStylePointerCast_(const char code[], const char* file, int line) {
         // Clear the error buffer..

tools/triage/mainwindow.cpp

@@ -341,12 +341,11 @@ void MainWindow::findInFilesClicked()
 
         QFile file(fileName);
         if (file.open(QIODevice::ReadOnly)) {
-            QString line;
             int lineN = 0;
             QTextStream in(&file);
             while (!in.atEnd()) {
                 ++lineN;
-                line = in.readLine();
+                QString line = in.readLine();
                 if (line.contains(text, Qt::CaseInsensitive)) {
                     ui->inFilesResult->addItem(fileName.mid(common_path_len) + QString{":"} + QString::number(lineN));
                 }