Fixed #7704 (QString::sprintf format string checking)

cfg/qt.cfg

@@ -68,6 +68,16 @@
   <function name="SIGNAL">
     <ignorefunction>true</ignorefunction>
   </function>
+  <!-- QString & QString::sprintf(const char * cformat, ...); -->
+  <function name="QString::sprintf">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <formatstr/>
+    <arg nr="1">
+      <formatstr/>
+      <not-uninit/>
+    </arg>
+  </function>
   <define name="Q_DECL_EXPORT" value=""/>
   <define name="Q_DECL_IMPORT" value=""/>
   <define name="Q_DECLARE_FLAGS(x,y)" value=""/>

test/testio.cpp

@@ -32,6 +32,7 @@ private:
     void run() {
         LOAD_LIB_2(settings.library, "std.cfg");
         LOAD_LIB_2(settings.library, "windows.cfg");
+        LOAD_LIB_2(settings.library, "qt.cfg");
 
         TEST_CASE(coutCerrMisusage);
 
@@ -57,6 +58,8 @@ private:
         TEST_CASE(testMicrosoftSecurePrintfArgument);
         TEST_CASE(testMicrosoftSecureScanfArgument);
 
+        TEST_CASE(testQStringFormatArguments);
+
         TEST_CASE(testTernary); // ticket #6182
         TEST_CASE(testUnsignedConst); // ticket #6132
 
@@ -2819,6 +2822,14 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void testQStringFormatArguments() {
+        check("void foo(float f) {\n"
+              "    QString string;\n"
+              "    string.sprintf(\"%d\", f);\n"
+              "}", false, false, Settings::Win32A);
+        ASSERT_EQUALS("[test.cpp:3]: (warning) %d in format string (no. 1) requires 'int' but the argument type is 'float'.\n", errout.str());
+    }
+
     void testTernary() {  // ticket #6182
         check("void test(const std::string &val) {\n"
               "    printf(\"%s\n\", val.empty() ? \"I like to eat bananas\" : val.c_str());\n"