TestBufferOverrun: split up strncpy testing, keep checker testing in TestBufferOverrun and move cfg tests to cfg test

test/cfg/std.c

@@ -22,6 +22,17 @@ void strcpy_bad() {
 }
 
 
+void strncpy_ok() {
+    char a[5];
+    strncpy(a,"hello world!",5);
+}
+
+void strncpy_bad() {
+  char a[5];
+  // cppcheck-suppress bufferAccessOutOfBounds
+  strncpy(a, "hello world!",10);
+}
+
 // null pointer
 
 void nullpointer(int value){

test/testbufferoverrun.cpp

@@ -21,6 +21,7 @@
 #include "checkbufferoverrun.h"
 #include "testsuite.h"
 
+#include <tinyxml2.h>
 #include <sstream>
 #include <climits>
 
@@ -70,15 +71,7 @@ private:
         checkBufferOverrun.writeOutsideBufferSize();
     }
 
-    void checkstd(const char code[], const char filename[] = "test.cpp") {
+    void check(const char code[], const Settings &settings, const char filename[] = "test.cpp") {
-        static bool init;
-        static Settings settings;
-        if (!init) {
-            init = true;
-            LOAD_LIB_2(settings.library, "std.cfg");
-            settings.addEnabled("warning");
-        }
-
         Tokenizer tokenizer(&settings, this);
         std::istringstream istr(code);
         tokenizer.tokenize(istr, filename);
@@ -95,6 +88,17 @@ private:
         checkBufferOverrun.writeOutsideBufferSize();
     }
 
+    void checkstd(const char code[], const char filename[] = "test.cpp") {
+        static bool init;
+        static Settings settings;
+        if (!init) {
+            init = true;
+            LOAD_LIB_2(settings.library, "std.cfg");
+            settings.addEnabled("warning");
+        }
+        check(code, settings, filename);
+    }
+
     void checkposix(const char code[], const char filename[] = "test.cpp") {
         static bool init;
         static Settings settings;
@@ -283,7 +287,7 @@ private:
         TEST_CASE(memset1);
         TEST_CASE(memset2);
         TEST_CASE(counter_test);
-        TEST_CASE(strncpy1);
+        TEST_CASE(minsize_sizeof);
         TEST_CASE(unknownType);
 
         TEST_CASE(terminateStrncpy1);
@@ -3740,35 +3744,52 @@ private:
 
     }
 
-    void strncpy1() {
+    void minsize_sizeof() {
-        checkstd("void f() {\n"
+        Settings settings;
+        const char xmldata[] = "<?xml version=\"1.0\"?>\n"
+                               "<def>\n"
+                               "  <function name=\"strncpy\">\n"
+                               "    <noreturn>false</noreturn>\n"
+                               "    <arg nr=\"1\">\n"
+                               "      <minsize type=\"sizeof\" arg=\"2\"/>\n"
+                               "      <minsize type=\"argvalue\" arg=\"3\"/>\n"
+                               "    </arg>\n"
+                               "    <arg nr=\"2\"/>\n"
+                               "    <arg nr=\"3\"/>\n"
+                               "  </function>\n"
+                               "</def>";
+        tinyxml2::XMLDocument doc;
+        doc.Parse(xmldata, sizeof(xmldata));
+        settings.library.load(doc);
+
+        check("void f() {\n"
               "    char c[7];\n"
               "    strncpy(c, \"hello\", 7);\n"
-                 "}");
+              "}", settings);
         ASSERT_EQUALS("", errout.str());
 
-        checkstd("void f() {\n"
+        check("void f() {\n"
               " char c[6];\n"
               " strncpy(c,\"hello\",6);\n"
-                 "}");
+              "}", settings);
         ASSERT_EQUALS("", errout.str());
 
-        checkstd("void f() {\n"
+        check("void f() {\n"
               " char c[5];\n"
               " strncpy(c,\"hello\",6);\n"
-                 "}");
+              "}", settings);
         ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: c\n", errout.str());
 
-        checkstd("void f() {\n"
+        check("void f() {\n"
               "    char c[6];\n"
               "    strncpy(c,\"hello!\",7);\n"
-                 "}");
+              "}", settings);
         ASSERT_EQUALS("[test.cpp:3]: (error) Buffer is accessed out of bounds: c\n", errout.str());
 
-        checkstd("struct AB { char a[10]; };\n"
+        check("struct AB { char a[10]; };\n"
               "void foo(AB *ab) {\n"
               "    strncpy(x, ab->a, 100);\n"
-                 "}");
+              "}", settings);
         ASSERT_EQUALS("", errout.str());
     }