Fixed #3311, #3313 and #3339 (printf format string false positives)

lib/checkother.cpp

@@ -1229,12 +1229,6 @@ void CheckOther::invalidScanfError(const Token *tok)
 
 void CheckOther::checkWrongPrintfScanfArguments()
 {
-    // This check is experimental. See #3311, #3313, #3339
-    // TODO : fix tickets and remove this condition. When the condition
-    //        is removed the classInfo and getErrorMessages must be updated
-    if (!_settings->experimental)
-        return;
-
     if (!_settings->isEnabled("style"))
         return;
 
@@ -1300,8 +1294,15 @@ void CheckOther::checkWrongPrintfScanfArguments()
                 }
                 if (i == formatString.end())
                     break;
-            } else if (percent && std::isalpha(*i)) {
+            } else if (percent) {
+                while (!std::isalpha(*i)) {
+                    if (*i == '*')
                         numFormat++;
+                    ++i;
+                }
+                if (*i != 'm') // %m is a non-standard extension that requires no parameter
+                    numFormat++;
+
                 percent = false;
             }
         }

lib/checkother.h

@@ -353,7 +353,7 @@ public:
         c.bitwiseOnBooleanError(0, "varname", "&&");
         c.comparisonOfBoolExpressionWithIntError(0);
         c.SuspiciousSemicolonError(0);
-        //c.wrongPrintfScanfArgumentsError(0,"printf",3,2);
+        c.wrongPrintfScanfArgumentsError(0,"printf",3,2);
         c.cctypefunctionCallError(0, "funname", "value");
     }
 
@@ -375,7 +375,7 @@ public:
                "* sizeof for numeric given as function argument\n"
                "* incorrect length arguments for 'substr' and 'strncmp'\n"
                "* invalid usage of output stream. For example: std::cout << std::cout;'\n"
-               //"* wrong number of arguments given to 'printf' or 'scanf;'\n"
+               "* wrong number of arguments given to 'printf' or 'scanf;'\n"
 
                // style
                "* C-style pointer cast in cpp file\n"

test/testother.cpp

@@ -1997,6 +1997,9 @@ private:
               "    printf(\"%\"PRId64\"\n\", 123);\n"
               "    fprintf(stderr,\"%\"PRId64\"\n\", 123);\n"
               "    snprintf(str,10,\"%\"PRId64\"\n\", 123);\n"
+              "    fprintf(stderr, \"error: %m\n\");\n" // #3339
+              "    printf(\"string: %.*s\n\", len, string);\n" // #3311
+              "    fprintf(stderr, \"%*cText.\n\", indent, ' ');\n" // #3313
               "}\n",
               "test.cpp",
               true