Add tests for #4527, #10330 (#5734)

Author: chrchr-github

test/testuninitvar.cpp

@@ -6306,6 +6306,34 @@ class TestUninitVar : public TestFixture {
                         "    if ((b[0] = g()) == 0) {}\n"
                         "}");
         ASSERT_EQUALS("", errout.str());
+
+        valueFlowUninit("void f(const char *x, char *y);\n" // #4527
+                        "void g(char* b) {\n"
+                        "    char a[1000];\n"
+                        "    f(a, b);\n"
+                        "    printf(\"%s\", a);\n"
+                        "}");
+        ASSERT_EQUALS("[test.cpp:5]: (error) Uninitialized variable: a\n", errout.str());
+
+        valueFlowUninit("void usage(const char *);\n" // #10330
+                        "int main(int argc, char* argv[]) {\n"
+                        "    int user = 0;\n"
+                        "    struct passwd* pwd;\n"
+                        "    while (1) {\n"
+                        "        int c = getc();\n"
+                        "        if (c == -1)\n"
+                        "            break;\n"
+                        "        switch (c) {\n"
+                        "        case 'u': user = 123; break;\n"
+                        "        }\n"
+                        "    }\n"
+                        "    if (argc == 1)\n"
+                        "        usage(argv[0]);\n"
+                        "    if (user)\n"
+                        "        pwd = getpwnam(user);\n"
+                        "    if (pwd == NULL) {}\n"
+                        "}");
+        ASSERT_EQUALS("[test.cpp:15] -> [test.cpp:17]: (warning) Uninitialized variable: pwd\n", errout.str());
     }
 
     void valueFlowUninitBreak() { // Do not show duplicate warnings about the same uninitialized value