cppcheck/lib/checkobsoletefunctions.cpp

/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2012 Daniel Marjamäki and Cppcheck team.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

//---------------------------------------------------------------------------
// Obsolete functions
//---------------------------------------------------------------------------

#include "checkobsoletefunctions.h"
#include "symboldatabase.h"

//---------------------------------------------------------------------------


// Register this check class (by creating a static instance of it)
namespace {
    CheckObsoleteFunctions instance;
}

void CheckObsoleteFunctions::obsoleteFunctions()
{
    if (!_settings->isEnabled("style"))
        return;

    const SymbolDatabase *symbolDatabase = _tokenizer->getSymbolDatabase();

    for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {

        if (tok->isName() && tok->varId()==0 && (tok->next() && tok->next()->str() == "(") &&
            (!Token::Match(tok->previous(), ".|::|:|,") || Token::simpleMatch(tok->tokAt(-2), "std :: gets"))) {
            // c function declaration?
            if ((tok->next()->link()->next() && tok->next()->link()->next()->str() == ";") && (tok->previous() && (tok->previous()->str() == "*" || tok->previous()->isName()))) {
                continue;
            }

            // function declaration?
            const Function * function = symbolDatabase->findFunctionByToken(tok);
            if (function && function->hasBody) {
                _obsoleteStandardFunctions.erase(tok->str());
                _obsoletePosixFunctions.erase(tok->str());
                continue;
            }

            std::map<std::string,std::string>::const_iterator it = _obsoleteStandardFunctions.find(tok->str());
            if (it != _obsoleteStandardFunctions.end()) {
                // If checking an old code base it might be uninteresting to update obsolete functions.
                // Therefore this is "information"
                reportError(tok->next(), Severity::style, "obsoleteFunctions"+it->first, it->second);
            } else {
                if (_settings->standards.posix) {
                    it = _obsoletePosixFunctions.find(tok->str());
                    if (it != _obsoletePosixFunctions.end()) {
                        // If checking an old code base it might be uninteresting to update obsolete functions.
                        // Therefore this is "information"
                        reportError(tok->next(), Severity::style, "obsoleteFunctions"+it->first, it->second);
                    }
                }
                if (_settings->standards.c >= Standards::C99) {
                    // alloca : this function is obsolete in C but not in C++ (#4382)
                    it = _obsoleteC99Functions.find(tok->str());
                    if (it != _obsoleteC99Functions.end() && !(tok->str() == "alloca" && _tokenizer->isCPP())) {
                        reportError(tok->next(), Severity::style, "obsoleteFunctions"+it->first, it->second);
                    }
                }
            }
        }
    }
}
//---------------------------------------------------------------------------