131 lines
5.4 KiB
C++
131 lines
5.4 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2021 Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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//---------------------------------------------------------------------------
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#ifndef checkstringH
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#define checkstringH
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//---------------------------------------------------------------------------
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#include "check.h"
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#include "config.h"
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#include <string>
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class ErrorLogger;
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class Settings;
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class Token;
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class Tokenizer;
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/// @addtogroup Checks
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/// @{
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/** @brief Detect misusage of C-style strings and related standard functions */
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class CPPCHECKLIB CheckString : public Check {
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public:
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/** @brief This constructor is used when registering the CheckClass */
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CheckString() : Check(myName()) {}
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/** @brief This constructor is used when running checks. */
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CheckString(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
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: Check(myName(), tokenizer, settings, errorLogger) {}
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/** @brief Run checks against the normal token list */
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void runChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger) OVERRIDE {
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CheckString checkString(tokenizer, settings, errorLogger);
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// Checks
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checkString.strPlusChar();
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checkString.checkSuspiciousStringCompare();
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checkString.stringLiteralWrite();
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checkString.overlappingStrcmp();
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checkString.checkIncorrectStringCompare();
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checkString.sprintfOverlappingData();
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checkString.checkAlwaysTrueOrFalseStringCompare();
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}
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/** @brief undefined behaviour, writing string literal */
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void stringLiteralWrite();
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/** @brief str plus char (unusual pointer arithmetic) */
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void strPlusChar();
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/** @brief %Check for using bad usage of strncmp and substr */
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void checkIncorrectStringCompare();
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/** @brief %Check for comparison of a string literal with a char* variable */
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void checkSuspiciousStringCompare();
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/** @brief %Check for suspicious code that compares string literals for equality */
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void checkAlwaysTrueOrFalseStringCompare();
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/** @brief %Check for overlapping strcmp() */
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void overlappingStrcmp();
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/** @brief %Check for overlapping source and destination passed to sprintf() */
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void sprintfOverlappingData();
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private:
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void stringLiteralWriteError(const Token *tok, const Token *strValue);
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void sprintfOverlappingDataError(const Token *funcTok, const Token *tok, const std::string &varname);
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void strPlusCharError(const Token *tok);
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void incorrectStringCompareError(const Token *tok, const std::string& func, const std::string &string);
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void incorrectStringBooleanError(const Token *tok, const std::string& string);
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void alwaysTrueFalseStringCompareError(const Token *tok, const std::string& str1, const std::string& str2);
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void alwaysTrueStringVariableCompareError(const Token *tok, const std::string& str1, const std::string& str2);
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void suspiciousStringCompareError(const Token* tok, const std::string& var, bool isLong);
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void suspiciousStringCompareError_char(const Token* tok, const std::string& var);
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void overlappingStrcmpError(const Token* eq0, const Token *ne0);
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void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const OVERRIDE {
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CheckString c(nullptr, settings, errorLogger);
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c.stringLiteralWriteError(nullptr, nullptr);
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c.sprintfOverlappingDataError(nullptr, nullptr, "varname");
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c.strPlusCharError(nullptr);
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c.incorrectStringCompareError(nullptr, "substr", "\"Hello World\"");
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c.suspiciousStringCompareError(nullptr, "foo", false);
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c.suspiciousStringCompareError_char(nullptr, "foo");
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c.incorrectStringBooleanError(nullptr, "\"Hello World\"");
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c.incorrectStringBooleanError(nullptr, "\'x\'");
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c.alwaysTrueFalseStringCompareError(nullptr, "str1", "str2");
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c.alwaysTrueStringVariableCompareError(nullptr, "varname1", "varname2");
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c.overlappingStrcmpError(nullptr, nullptr);
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}
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static std::string myName() {
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return "String";
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}
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std::string classInfo() const OVERRIDE {
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return "Detect misusage of C-style strings:\n"
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"- overlapping buffers passed to sprintf as source and destination\n"
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"- incorrect length arguments for 'substr' and 'strncmp'\n"
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"- suspicious condition (runtime comparison of string literals)\n"
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"- suspicious condition (string/char literals as boolean)\n"
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"- suspicious comparison of a string literal with a char\\* variable\n"
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"- suspicious comparison of '\\0' with a char\\* variable\n"
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"- overlapping strcmp() expression\n";
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}
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};
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/// @}
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//---------------------------------------------------------------------------
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#endif // checkstringH
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