Fix false positives for %[ in scanf

lib/checkother.cpp

@@ -1280,6 +1280,17 @@ void CheckOther::checkWrongPrintfScanfArguments()
         for (std::string::iterator i = formatString.begin(); i != formatString.end(); ++i) {
             if (*i == '%') {
                 percent = !percent;
+            } else if (percent && *i == '[') {
+                while (i != formatString.end()) {
+                    if (*i == ']') {
+                        numFormat++;
+                        percent = false;
+                        break;
+                    }
+                    ++i;
+                }
+                if (i == formatString.end())
+                    break;
             } else if (percent && std::isalpha(*i)) {
                 numFormat++;
                 percent = false;

test/testother.cpp

@@ -87,6 +87,7 @@ private:
         TEST_CASE(selfAssignment);
         TEST_CASE(testScanf1);
         TEST_CASE(testScanf2);
+        TEST_CASE(testScanf3);
 
         TEST_CASE(testPrintfArgument);
 
@@ -1919,6 +1920,32 @@ private:
                       "[test.cpp:8]: (warning) fscanf format string has 0 parameters but 1 are given\n", errout.str());
     }
 
+    void testScanf3() {
+        check("#include <stdio.h>\n"
+              "int main(int argc, char **argv)\n"
+              "{\n"
+              "    char a[32];\n"
+              "    int b, c;\n"
+              "    FILE *file = fopen(\"test\", \"r\");\n"
+              "    c = fscanf(file, \"%[^ ] %d\n\", a, &b);\n"
+              "    fclose(file);\n"
+              "    return c;\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+
+        check("#include <stdio.h>\n"
+              "int main(int argc, char **argv)\n"
+              "{\n"
+              "    char a[32];\n"
+              "    int b;\n"
+              "    FILE *file = fopen(\"test\", \"r\");\n"
+              "    b = fscanf(file, \"%[^ \n\", a);\n"
+              "    fclose(file);\n"
+              "    return b;\n"
+              "}\n");
+        ASSERT_EQUALS("[test.cpp:7]: (warning) fscanf format string has 0 parameters but 1 are given\n", errout.str());
+    }
+
     void testPrintfArgument() {
         check("void foo() {\n"
               "    printf(\"%u\");\n"