Add tests for #8399/#10646/#10833 (#5743)

Author: chrchr-github

test/cfg/windows.cpp

@@ -593,6 +593,20 @@ void memleak_LocalAlloc()
     // cppcheck-suppress memleak
 }
 
+void memleak_dupenv_s() // #10646
+{
+    char* pValue;
+    size_t len;
+    errno_t err = _dupenv_s(&pValue, &len, "pathext");
+    if (err) return -1;
+    printf("pathext = %s\n", pValue);
+    free(pValue);
+    err = _dupenv_s(&pValue, &len, "nonexistentvariable");
+    if (err) return -1;
+    printf("nonexistentvariable = %s\n", pValue);
+    // cppcheck-suppress memleak
+}
+
 void resourceLeak_CreateSemaphoreA()
 {
     HANDLE hSemaphore;

test/testautovariables.cpp

@@ -2933,6 +2933,13 @@ class TestAutoVariables : public TestFixture {
         ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:2] -> [test.cpp:3]: (error) Using object that is a temporary.\n",
                       errout.str());
 
+        // #10833
+        check("struct A { std::string s; };\n"
+              "const std::string& f(A* a) {\n"
+              "    return a ? a->s : \"\";\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:3]: (error) Reference to temporary returned.\n", errout.str());
+
         check("std::span<int> f() {\n"
               "    std::vector<int> v{};\n"
               "    return v;\n"

test/testtype.cpp

@@ -490,6 +490,8 @@ class TestType : public TestFixture {
         dui.std = "c++11";
         // this is set by the production code via cppcheck::Platform::getLimitDefines()
         dui.defines.emplace_back("INT_MIN=-2147483648");
+        dui.defines.emplace_back("INT32_MAX=2147483647");
+        dui.defines.emplace_back("int32_t=int");
 
         checkP("int fun(int x)\n"
                "{\n"
@@ -501,6 +503,13 @@ class TestType : public TestFixture {
                "    fun(INT_MIN);\n"
                "}", settings, "test.cpp", dui);
         ASSERT_EQUALS("[test.cpp:3]: (error) Signed integer overflow for expression '-x'.\n", errout.str());
+
+        checkP("void f() {\n" // #8399
+               "    int32_t i = INT32_MAX;\n"
+               "    i << 1;\n"
+               "    i << 2;\n"
+               "}", settings, "test.cpp", dui);
+        ASSERT_EQUALS("[test.cpp:4]: (error) Signed integer overflow for expression 'i<<2'.\n", errout.str());
     }
 };