Merge pull request #154 from simartin/ticket_4900
Fixed #4900 (error wrongPrintfScanfArgNum doesn't support positional parameters)
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1409461e4f
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@ -502,6 +502,7 @@ void CheckIO::checkWrongPrintfScanfArguments()
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unsigned int numFormat = 0;
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bool percent = false;
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const Token* argListTok2 = argListTok;
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std::set<unsigned int> parameterPositionsUsed;
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for (std::string::iterator i = formatString.begin(); i != formatString.end(); ++i) {
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if (*i == '%') {
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percent = !percent;
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@ -523,6 +524,7 @@ void CheckIO::checkWrongPrintfScanfArguments()
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bool _continue = false;
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std::string width;
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unsigned int parameterPosition = 0; bool hasParameterPosition = false;
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while (i != formatString.end() && *i != ']' && !std::isalpha(*i)) {
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if (*i == '*') {
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if (scan)
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@ -532,8 +534,13 @@ void CheckIO::checkWrongPrintfScanfArguments()
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if (argListTok)
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argListTok = argListTok->nextArgument();
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}
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} else if (std::isdigit(*i))
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} else if (std::isdigit(*i)) {
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width += *i;
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} else if (*i == '$') {
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parameterPosition = static_cast<unsigned int>(std::atoi(width.c_str()));
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hasParameterPosition = true;
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width.clear();
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}
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++i;
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}
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if (i == formatString.end())
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@ -542,7 +549,15 @@ void CheckIO::checkWrongPrintfScanfArguments()
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continue;
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if (scan || *i != 'm') { // %m is a non-standard extension that requires no parameter on print functions.
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numFormat++;
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++numFormat;
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// Handle parameter positions (POSIX extension) - Ticket #4900
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if(hasParameterPosition) {
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if(parameterPositionsUsed.find(parameterPosition) == parameterPositionsUsed.end())
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parameterPositionsUsed.insert(parameterPosition);
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else // Parameter already referenced, hence don't consider it a new format
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--numFormat;
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}
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// Perform type checks
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if (argListTok && Token::Match(argListTok->next(), "[,)]")) { // We can currently only check the type of arguments matching this simple pattern.
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@ -719,6 +734,12 @@ void CheckIO::checkWrongPrintfScanfArguments()
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argListTok2 = argListTok2->nextArgument(); // Find next argument
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}
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// Check that all parameter positions reference an actual parameter
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for(std::set<unsigned int>::const_iterator it = parameterPositionsUsed.begin() ; it != parameterPositionsUsed.end() ; ++it) {
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if((*it == 0) || (*it > numFormat))
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wrongPrintfScanfPosixParameterPositionError(tok, tok->str(), *it, numFormat);
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}
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// Mismatching number of parameters => warning
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if (numFormat != numFunction)
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wrongPrintfScanfArgumentsError(tok, tok->str(), numFormat, numFunction);
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@ -747,6 +768,21 @@ void CheckIO::wrongPrintfScanfArgumentsError(const Token* tok,
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reportError(tok, severity, "wrongPrintfScanfArgNum", errmsg.str());
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}
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void CheckIO::wrongPrintfScanfPosixParameterPositionError(const Token* tok, const std::string& functionName,
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unsigned int index, unsigned int numFunction)
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{
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if (!_settings->isEnabled("style"))
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return;
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std::ostringstream errmsg;
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errmsg << functionName << ": ";
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if(index == 0) {
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errmsg << "parameter positions start at 1, not 0";
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} else {
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errmsg << "referencing parameter " << index << " while " << numFunction << " arguments given";
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}
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reportError(tok, Severity::warning, "wrongPrintfScanfParameterError", errmsg.str());
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}
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void CheckIO::invalidScanfArgTypeError(const Token* tok, const std::string &functionName, unsigned int numFormat)
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{
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std::ostringstream errmsg;
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@ -82,6 +82,8 @@ private:
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const std::string &function,
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unsigned int numFormat,
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unsigned int numFunction);
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void wrongPrintfScanfPosixParameterPositionError(const Token* tok, const std::string& functionName,
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unsigned int index, unsigned int numFunction);
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void invalidScanfArgTypeError(const Token* tok, const std::string &functionName, unsigned int numFormat);
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void invalidPrintfArgTypeError_s(const Token* tok, unsigned int numFormat);
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void invalidPrintfArgTypeError_n(const Token* tok, unsigned int numFormat);
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@ -46,6 +46,7 @@ private:
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TEST_CASE(testScanfArgument);
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TEST_CASE(testPrintfArgument);
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TEST_CASE(testPosixPrintfScanfParameterPosition); // #4900
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TEST_CASE(testMicrosoftPrintfArgument); // ticket #4902
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@ -780,6 +781,30 @@ private:
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}
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void testPosixPrintfScanfParameterPosition() { // #4900 - No support for parameters in format strings
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check("void foo() {"
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" int bar;"
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" printf(\"%1$d\", 1);"
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" printf(\"%1$d, %d, %1$d\", 1, 2);"
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" scanf(\"%1$d\", &bar);"
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"}");
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ASSERT_EQUALS("", errout.str());
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check("void foo() {\n"
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" int bar;\n"
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" printf(\"%1$d\");\n"
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" printf(\"%1$d, %d, %4$d\", 1, 2, 3);\n"
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" scanf(\"%2$d\", &bar);\n"
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" printf(\"%0$f\", 0.0);\n"
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"}");
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ASSERT_EQUALS("[test.cpp:3]: (error) printf format string has 1 parameters but only 0 are given.\n"
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"[test.cpp:4]: (warning) printf: referencing parameter 4 while 3 arguments given\n"
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"[test.cpp:5]: (warning) scanf: referencing parameter 2 while 1 arguments given\n"
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"[test.cpp:6]: (warning) printf: parameter positions start at 1, not 0\n"
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"", errout.str());
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}
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void testMicrosoftPrintfArgument() {
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check("void foo() {\n"
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" size_t s;\n"
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