/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2016 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/>.
 */

#include "cmdlineparser.h"

#include "check.h"
#include "cppcheckexecutor.h"
#include "filelister.h"
#include "importproject.h"
#include "path.h"
#include "platform.h"
#include "settings.h"
#include "standards.h"
#include "suppressions.h"
#include "threadexecutor.h" // Threading model
#include "timer.h"
#include "utils.h"

#include <algorithm>
#include <cstdio>
#include <cstdlib> // EXIT_FAILURE
#include <cstring>
#include <iostream>
#include <list>
#include <set>

#ifdef HAVE_RULES
// xml is used for rules
#include <tinyxml2.h>
#endif

static void AddFilesToList(const std::string& FileList, std::vector<std::string>& PathNames)
{
 // To keep things initially simple, if the file can't be opened, just be silent and move on.
 std::istream *Files;
 std::ifstream Infile;
 if (FileList == "-") { // read from stdin
 Files = &std::cin;
 } else {
 Infile.open(FileList.c_str());
 Files = &Infile;
 }
 if (Files && *Files) {
 std::string FileName;
 while (std::getline(*Files, FileName)) { // next line
 if (!FileName.empty()) {
 PathNames.push_back(FileName);
 }
 }
 }
}

static void AddInclPathsToList(const std::string& FileList, std::list<std::string>* PathNames)
{
 // To keep things initially simple, if the file can't be opened, just be silent and move on.
 std::ifstream Files(FileList.c_str());
 if (Files) {
 std::string PathName;
 while (std::getline(Files, PathName)) { // next line
 if (!PathName.empty()) {
 PathName = Path::removeQuotationMarks(PathName);
 PathName = Path::fromNativeSeparators(PathName);

 // If path doesn't end with / or ,円 add it
 if (PathName.back() != '/')
 PathName += '/';

 PathNames->push_back(PathName);
 }
 }
 }
}

static void AddPathsToSet(const std::string& FileName, std::set<std::string>* set)
{
 std::list<std::string> templist;
 AddInclPathsToList(FileName, &templist);
 set->insert(templist.begin(), templist.end());
}

CmdLineParser::CmdLineParser(Settings *settings)
 : _settings(settings)
 , _showHelp(false)
 , _showVersion(false)
 , _showErrorMessages(false)
 , _exitAfterPrint(false)
{
}

void CmdLineParser::PrintMessage(const std::string &message)
{
 std::cout << message << std::endl;
}

void CmdLineParser::PrintMessage(const char* message)
{
 std::cout << message << std::endl;
}

bool CmdLineParser::ParseFromArgs(int argc, const char* const argv[])
{
 bool def = false;
 bool maxconfigs = false;

 for (int i = 1; i < argc; i++) {
 if (argv[i][0] == '-') {
 if (std::strcmp(argv[i], "--version") == 0) {
 _showVersion = true;
 _exitAfterPrint = true;
 return true;
 }

 else if (std::strncmp(argv[i], "--cppcheck-build-dir=", 21) == 0) {
 _settings->buildDir = Path::fromNativeSeparators(argv[i] + 21);
 if (endsWith(_settings->buildDir, '/'))
 _settings->buildDir.erase(_settings->buildDir.size() - 1U);
 }

 // Flag used for various purposes during debugging
 else if (std::strcmp(argv[i], "--debug") == 0)
 _settings->debug = _settings->debugwarnings = true;

 // Show --debug output after the first simplifications
 else if (std::strcmp(argv[i], "--debug-normal") == 0)
 _settings->debugnormal = true;

 // Show debug warnings
 else if (std::strcmp(argv[i], "--debug-warnings") == 0)
 _settings->debugwarnings = true;

 // dump cppcheck data
 else if (std::strcmp(argv[i], "--dump") == 0)
 _settings->dump = true;

 // (Experimental) exception handling inside cppcheck client
 else if (std::strcmp(argv[i], "--exception-handling") == 0)
 _settings->exceptionHandling = true;
 else if (std::strncmp(argv[i], "--exception-handling=", 21) == 0) {
 _settings->exceptionHandling = true;
 const std::string exceptionOutfilename = &(argv[i][21]);
 CppCheckExecutor::setExceptionOutput((exceptionOutfilename=="stderr") ? stderr : stdout);
 }

 // Inconclusive checking
 else if (std::strcmp(argv[i], "--inconclusive") == 0)
 _settings->inconclusive = true;

 // Enforce language (--language=, -x)
 else if (std::strncmp(argv[i], "--language=", 11) == 0 || std::strcmp(argv[i], "-x") == 0) {
 std::string str;
 if (argv[i][2]) {
 str = argv[i]+11;
 } else {
 i++;
 if (i >= argc || argv[i][0] == '-') {
 PrintMessage("cppcheck: No language given to '-x' option.");
 return false;
 }
 str = argv[i];
 }

 if (str == "c")
 _settings->enforcedLang = Settings::C;
 else if (str == "c++")
 _settings->enforcedLang = Settings::CPP;
 else {
 PrintMessage("cppcheck: Unknown language '" + str + "' enforced.");
 return false;
 }
 }

 // Filter errors
 else if (std::strncmp(argv[i], "--exitcode-suppressions=", 24) == 0) {
 // exitcode-suppressions=filename.txt
 std::string filename = 24 + argv[i];

 std::ifstream f(filename.c_str());
 if (!f.is_open()) {
 PrintMessage("cppcheck: Couldn't open the file: \"" + filename + "\".");
 return false;
 }
 const std::string errmsg(_settings->nofail.parseFile(f));
 if (!errmsg.empty()) {
 PrintMessage(errmsg);
 return false;
 }
 }

 // Filter errors
 else if (std::strncmp(argv[i], "--suppressions-list=", 20) == 0) {
 std::string filename = argv[i]+20;
 std::ifstream f(filename.c_str());
 if (!f.is_open()) {
 std::string message("cppcheck: Couldn't open the file: \"");
 message += filename;
 message += "\".";
 if (std::count(filename.begin(), filename.end(), ',') > 0 ||
 std::count(filename.begin(), filename.end(), '.') > 1) {
 // If user tried to pass multiple files (we can only guess that)
 // e.g. like this: --suppressions-list=a.txt,b.txt
 // print more detailed error message to tell user how he can solve the problem
 message += "\nIf you want to pass two files, you can do it e.g. like this:";
 message += "\n cppcheck --suppressions-list=a.txt --suppressions-list=b.txt file.cpp";
 }

 PrintMessage(message);
 return false;
 }
 const std::string errmsg(_settings->nomsg.parseFile(f));
 if (!errmsg.empty()) {
 PrintMessage(errmsg);
 return false;
 }
 }

 else if (std::strncmp(argv[i], "--suppress=", 11) == 0) {
 std::string suppression = argv[i]+11;
 const std::string errmsg(_settings->nomsg.addSuppressionLine(suppression));
 if (!errmsg.empty()) {
 PrintMessage(errmsg);
 return false;
 }
 }

 // Enables inline suppressions.
 else if (std::strcmp(argv[i], "--inline-suppr") == 0)
 _settings->inlineSuppressions = true;

 // Verbose error messages (configuration info)
 else if (std::strcmp(argv[i], "-v") == 0 || std::strcmp(argv[i], "--verbose") == 0)
 _settings->verbose = true;

 // Force checking of files that have "too many" configurations
 else if (std::strcmp(argv[i], "-f") == 0 || std::strcmp(argv[i], "--force") == 0)
 _settings->force = true;

 // Output relative paths
 else if (std::strcmp(argv[i], "-rp") == 0 || std::strcmp(argv[i], "--relative-paths") == 0)
 _settings->relativePaths = true;
 else if (std::strncmp(argv[i], "-rp=", 4) == 0 || std::strncmp(argv[i], "--relative-paths=", 17) == 0) {
 _settings->relativePaths = true;
 if (argv[i][argv[i][3]=='='?4:17] != 0) {
 std::string paths = argv[i]+(argv[i][3]=='='?4:17);
 for (;;) {
 std::string::size_type pos = paths.find(';');
 if (pos == std::string::npos) {
 _settings->basePaths.push_back(Path::fromNativeSeparators(paths));
 break;
 } else {
 _settings->basePaths.push_back(Path::fromNativeSeparators(paths.substr(0, pos)));
 paths.erase(0, pos + 1);
 }
 }
 } else {
 PrintMessage("cppcheck: No paths specified for the '" + std::string(argv[i]) + "' option.");
 return false;
 }
 }

 // Write results in file
 else if (std::strncmp(argv[i], "--output-file=", 14) == 0)
 _settings->outputFile = Path::simplifyPath(Path::fromNativeSeparators(argv[i] + 14));

 // Write results in results.plist
 else if (std::strncmp(argv[i], "--plist-output=", 15) == 0) {
 _settings->plistOutput = Path::simplifyPath(Path::fromNativeSeparators(argv[i] + 15));
 if (_settings->plistOutput.empty())
 _settings->plistOutput = "./";
 else if (!endsWith(_settings->plistOutput,'/'))
 _settings->plistOutput += '/';
 }

 // Write results in results.xml
 else if (std::strcmp(argv[i], "--xml") == 0)
 _settings->xml = true;

 // Define the XML file version (and enable XML output)
 else if (std::strncmp(argv[i], "--xml-version=", 14) == 0) {
 std::string numberString(argv[i]+14);

 std::istringstream iss(numberString);
 if (!(iss >> _settings->xml_version)) {
 PrintMessage("cppcheck: argument to '--xml-version' is not a number.");
 return false;
 }

 if (_settings->xml_version != 2) {
 // We only have xml version 2
 PrintMessage("cppcheck: '--xml-version' can only be 2.");
 return false;
 }

 // Enable also XML if version is set
 _settings->xml = true;
 }

 // Only print something when there are errors
 else if (std::strcmp(argv[i], "-q") == 0 || std::strcmp(argv[i], "--quiet") == 0)
 _settings->quiet = true;

 // Check configuration
 else if (std::strcmp(argv[i], "--check-config") == 0) {
 _settings->checkConfiguration = true;
 }

 // Check library definitions
 else if (std::strcmp(argv[i], "--check-library") == 0) {
 _settings->checkLibrary = true;
 }

 else if (std::strncmp(argv[i], "--enable=", 9) == 0) {
 const std::string errmsg = _settings->addEnabled(argv[i] + 9);
 if (!errmsg.empty()) {
 PrintMessage(errmsg);
 return false;
 }
 // when "style" is enabled, also enable "warning", "performance" and "portability"
 if (_settings->isEnabled(Settings::STYLE)) {
 _settings->addEnabled("warning");
 _settings->addEnabled("performance");
 _settings->addEnabled("portability");
 }
 }

 // --error-exitcode=1
 else if (std::strncmp(argv[i], "--error-exitcode=", 17) == 0) {
 std::string temp = argv[i]+17;
 std::istringstream iss(temp);
 if (!(iss >> _settings->exitCode)) {
 _settings->exitCode = 0;
 PrintMessage("cppcheck: Argument must be an integer. Try something like '--error-exitcode=1'.");
 return false;
 }
 }

 // User define
 else if (std::strncmp(argv[i], "-D", 2) == 0) {
 std::string define;

 // "-D define"
 if (std::strcmp(argv[i], "-D") == 0) {
 ++i;
 if (i >= argc || argv[i][0] == '-') {
 PrintMessage("cppcheck: argument to '-D' is missing.");
 return false;
 }

 define = argv[i];
 }
 // "-Ddefine"
 else {
 define = 2 + argv[i];
 }

 // No "=", append a "=1"
 if (define.find('=') == std::string::npos)
 define += "=1";

 if (!_settings->userDefines.empty())
 _settings->userDefines += ";";
 _settings->userDefines += define;

 def = true;
 }
 // User undef
 else if (std::strncmp(argv[i], "-U", 2) == 0) {
 std::string undef;

 // "-U undef"
 if (std::strcmp(argv[i], "-U") == 0) {
 ++i;
 if (i >= argc || argv[i][0] == '-') {
 PrintMessage("cppcheck: argument to '-U' is missing.");
 return false;
 }

 undef = argv[i];
 }
 // "-Uundef"
 else {
 undef = 2 + argv[i];
 }

 _settings->userUndefs.insert(undef);
 }

 // -E
 else if (std::strcmp(argv[i], "-E") == 0) {
 _settings->preprocessOnly = true;
 }

 // Include paths
 else if (std::strncmp(argv[i], "-I", 2) == 0) {
 std::string path;

 // "-I path/"
 if (std::strcmp(argv[i], "-I") == 0) {
 ++i;
 if (i >= argc || argv[i][0] == '-') {
 PrintMessage("cppcheck: argument to '-I' is missing.");
 return false;
 }
 path = argv[i];
 }

 // "-Ipath/"
 else {
 path = 2 + argv[i];
 }
 path = Path::removeQuotationMarks(path);
 path = Path::fromNativeSeparators(path);

 // If path doesn't end with / or ,円 add it
 if (path.back() != '/')
 path += '/';

 _settings->includePaths.push_back(path);
 } else if (std::strncmp(argv[i], "--include=", 10) == 0) {
 std::string path = argv[i] + 10;

 path = Path::fromNativeSeparators(path);

 _settings->userIncludes.push_back(path);
 } else if (std::strncmp(argv[i], "--includes-file=", 16) == 0) {
 // open this file and read every input file (1 file name per line)
 AddInclPathsToList(16 + argv[i], &_settings->includePaths);
 } else if (std::strncmp(argv[i], "--config-exclude=",17) ==0) {
 std::string path = argv[i] + 17;
 path = Path::fromNativeSeparators(path);
 _settings->configExcludePaths.insert(path);
 } else if (std::strncmp(argv[i], "--config-excludes-file=", 23) == 0) {
 // open this file and read every input file (1 file name per line)
 AddPathsToSet(23 + argv[i], &_settings->configExcludePaths);
 }

 // file list specified
 else if (std::strncmp(argv[i], "--file-list=", 12) == 0) {
 // open this file and read every input file (1 file name per line)
 AddFilesToList(12 + argv[i], _pathnames);
 }

 // Ignored paths
 else if (std::strncmp(argv[i], "-i", 2) == 0) {
 std::string path;

 // "-i path/"
 if (std::strcmp(argv[i], "-i") == 0) {
 ++i;
 if (i >= argc || argv[i][0] == '-') {
 PrintMessage("cppcheck: argument to '-i' is missing.");
 return false;
 }
 path = argv[i];
 }

 // "-ipath/"
 else {
 path = 2 + argv[i];
 }

 if (!path.empty()) {
 path = Path::removeQuotationMarks(path);
 path = Path::fromNativeSeparators(path);
 path = Path::simplifyPath(path);

 if (FileLister::isDirectory(path)) {
 // If directory name doesn't end with / or ,円 add it
 if (path.back() != '/')
 path += '/';
 }
 _ignoredPaths.push_back(path);
 }
 }

 // --library
 else if (std::strncmp(argv[i], "--library=", 10) == 0) {
 if (!CppCheckExecutor::tryLoadLibrary(_settings->library, argv[0], argv[i]+10))
 return false;
 }

 // --project
 else if (std::strncmp(argv[i], "--project=", 10) == 0) {
 _settings->project.import(argv[i]+10);
 if (std::strstr(argv[i], ".sln") || std::strstr(argv[i], ".vcxproj")) {
 if (!CppCheckExecutor::tryLoadLibrary(_settings->library, argv[0], "windows.cfg")) {
 // This shouldn't happen normally.
 PrintMessage("cppcheck: Failed to load 'windows.cfg'. Your Cppcheck installation is broken. Please re-install.");
 return false;
 }
 }
 }

 // Report progress
 else if (std::strcmp(argv[i], "--report-progress") == 0) {
 _settings->reportProgress = true;
 }

 // --std
 else if (std::strcmp(argv[i], "--std=posix") == 0) {
 _settings->standards.posix = true;
 } else if (std::strcmp(argv[i], "--std=c89") == 0) {
 _settings->standards.c = Standards::C89;
 } else if (std::strcmp(argv[i], "--std=c99") == 0) {
 _settings->standards.c = Standards::C99;
 } else if (std::strcmp(argv[i], "--std=c11") == 0) {
 _settings->standards.c = Standards::C11;
 } else if (std::strcmp(argv[i], "--std=c++03") == 0) {
 _settings->standards.cpp = Standards::CPP03;
 } else if (std::strcmp(argv[i], "--std=c++11") == 0) {
 _settings->standards.cpp = Standards::CPP11;
 } else if (std::strcmp(argv[i], "--std=c++14") == 0) {
 _settings->standards.cpp = Standards::CPP14;
 }

 // Output formatter
 else if (std::strcmp(argv[i], "--template") == 0 ||
 std::strncmp(argv[i], "--template=", 11) == 0) {
 // "--template path/"
 if (argv[i][10] == '=')
 _settings->outputFormat = argv[i] + 11;
 else if ((i+1) < argc && argv[i+1][0] != '-') {
 ++i;
 _settings->outputFormat = argv[i];
 } else {
 PrintMessage("cppcheck: argument to '--template' is missing.");
 return false;
 }

 if (_settings->outputFormat == "gcc")
 _settings->outputFormat = "{file}:{line}: {severity}: {message}";
 else if (_settings->outputFormat == "vs")
 _settings->outputFormat = "{file}({line}): {severity}: {message}";
 else if (_settings->outputFormat == "edit")
 _settings->outputFormat = "{file} +{line}: {severity}: {message}";
 }

 // Checking threads
 else if (std::strncmp(argv[i], "-j", 2) == 0) {
 std::string numberString;

 // "-j 3"
 if (std::strcmp(argv[i], "-j") == 0) {
 ++i;
 if (i >= argc || argv[i][0] == '-') {
 PrintMessage("cppcheck: argument to '-j' is missing.");
 return false;
 }

 numberString = argv[i];
 }

 // "-j3"
 else
 numberString = argv[i]+2;

 std::istringstream iss(numberString);
 if (!(iss >> _settings->jobs)) {
 PrintMessage("cppcheck: argument to '-j' is not a number.");
 return false;
 }

 if (_settings->jobs > 10000) {
 // This limit is here just to catch typos. If someone has
 // need for more jobs, this value should be increased.
 PrintMessage("cppcheck: argument for '-j' is allowed to be 10000 at max.");
 return false;
 }
 } else if (std::strncmp(argv[i], "-l", 2) == 0) {
 std::string numberString;

 // "-l 3"
 if (std::strcmp(argv[i], "-l") == 0) {
 ++i;
 if (i >= argc || argv[i][0] == '-') {
 PrintMessage("cppcheck: argument to '-l' is missing.");
 return false;
 }

 numberString = argv[i];
 }

 // "-l3"
 else
 numberString = argv[i]+2;

 std::istringstream iss(numberString);
 if (!(iss >> _settings->loadAverage)) {
 PrintMessage("cppcheck: argument to '-l' is not a number.");
 return false;
 }
 }

 // print all possible error messages..
 else if (std::strcmp(argv[i], "--errorlist") == 0) {
 _showErrorMessages = true;
 _settings->xml = true;
 _exitAfterPrint = true;
 }

 // documentation..
 else if (std::strcmp(argv[i], "--doc") == 0) {
 std::ostringstream doc;
 // Get documentation..
 for (std::list<Check *>::iterator it = Check::instances().begin(); it != Check::instances().end(); ++it) {
 const std::string& name((*it)->name());
 const std::string info((*it)->classInfo());
 if (!name.empty() && !info.empty())
 doc << "## " << name << " ##\n"
 << info << "\n";
 }

 std::cout << doc.str();
 _exitAfterPrint = true;
 return true;
 }

 // show timing information..
 else if (std::strncmp(argv[i], "--showtime=", 11) == 0) {
 const std::string showtimeMode = argv[i] + 11;
 if (showtimeMode == "file")
 _settings->showtime = SHOWTIME_FILE;
 else if (showtimeMode == "summary")
 _settings->showtime = SHOWTIME_SUMMARY;
 else if (showtimeMode == "top5")
 _settings->showtime = SHOWTIME_TOP5;
 else if (showtimeMode.empty())
 _settings->showtime = SHOWTIME_NONE;
 else {
 std::string message("cppcheck: error: unrecognized showtime mode: \"");
 message += showtimeMode;
 message += "\". Supported modes: file, summary, top5.";
 PrintMessage(message);
 return false;
 }
 }

#ifdef HAVE_RULES
 // Rule given at command line
 else if (std::strncmp(argv[i], "--rule=", 7) == 0) {
 Settings::Rule rule;
 rule.pattern = 7 + argv[i];
 _settings->rules.push_back(rule);
 }

 // Rule file
 else if (std::strncmp(argv[i], "--rule-file=", 12) == 0) {
 tinyxml2::XMLDocument doc;
 if (doc.LoadFile(12+argv[i]) == tinyxml2::XML_SUCCESS) {
 tinyxml2::XMLElement *node = doc.FirstChildElement();
 for (; node && strcmp(node->Value(), "rule") == 0; node = node->NextSiblingElement()) {
 Settings::Rule rule;

 tinyxml2::XMLElement *tokenlist = node->FirstChildElement("tokenlist");
 if (tokenlist)
 rule.tokenlist = tokenlist->GetText();

 tinyxml2::XMLElement *pattern = node->FirstChildElement("pattern");
 if (pattern) {
 rule.pattern = pattern->GetText();
 }

 tinyxml2::XMLElement *message = node->FirstChildElement("message");
 if (message) {
 tinyxml2::XMLElement *severity = message->FirstChildElement("severity");
 if (severity)
 rule.severity = Severity::fromString(severity->GetText());

 tinyxml2::XMLElement *id = message->FirstChildElement("id");
 if (id)
 rule.id = id->GetText();

 tinyxml2::XMLElement *summary = message->FirstChildElement("summary");
 if (summary)
 rule.summary = summary->GetText() ? summary->GetText() : "";
 }

 if (!rule.pattern.empty())
 _settings->rules.push_back(rule);
 }
 }
 }
#endif

 // Specify platform
 else if (std::strncmp(argv[i], "--platform=", 11) == 0) {
 std::string platform(11+argv[i]);

 if (platform == "win32A")
 _settings->platform(Settings::Win32A);
 else if (platform == "win32W")
 _settings->platform(Settings::Win32W);
 else if (platform == "win64")
 _settings->platform(Settings::Win64);
 else if (platform == "unix32")
 _settings->platform(Settings::Unix32);
 else if (platform == "unix64")
 _settings->platform(Settings::Unix64);
 else if (platform == "native")
 _settings->platform(Settings::Native);
 else if (platform == "unspecified")
 _settings->platform(Settings::Unspecified);
 else if (!_settings->platformFile(platform)) {
 std::string message("cppcheck: error: unrecognized platform: \"");
 message += platform;
 message += "\".";
 PrintMessage(message);
 return false;
 }
 }

 // Set maximum number of #ifdef configurations to check
 else if (std::strncmp(argv[i], "--max-configs=", 14) == 0) {
 _settings->force = false;

 std::istringstream iss(14+argv[i]);
 if (!(iss >> _settings->maxConfigs)) {
 PrintMessage("cppcheck: argument to '--max-configs=' is not a number.");
 return false;
 }

 if (_settings->maxConfigs < 1) {
 PrintMessage("cppcheck: argument to '--max-configs=' must be greater than 0.");
 return false;
 }

 maxconfigs = true;
 }

 // Print help
 else if (std::strcmp(argv[i], "-h") == 0 || std::strcmp(argv[i], "--help") == 0) {
 _pathnames.clear();
 _showHelp = true;
 _exitAfterPrint = true;
 break;
 }

 else {
 std::string message("cppcheck: error: unrecognized command line option: \"");
 message += argv[i];
 message += "\".";
 PrintMessage(message);
 return false;
 }
 }

 else {
 std::string path = Path::removeQuotationMarks(argv[i]);
 path = Path::fromNativeSeparators(path);
 _pathnames.push_back(path);
 }
 }

 _settings->project.ignorePaths(_ignoredPaths);

 if (_settings->force)
 _settings->maxConfigs = ~0U;

 else if ((def || _settings->preprocessOnly) && !maxconfigs)
 _settings->maxConfigs = 1U;

 if (_settings->isEnabled(Settings::UNUSED_FUNCTION) && _settings->jobs > 1) {
 PrintMessage("cppcheck: unusedFunction check can't be used with '-j' option. Disabling unusedFunction check.");
 }

 if (argc <= 1) {
 _showHelp = true;
 _exitAfterPrint = true;
 }

 if (_showHelp) {
 PrintHelp();
 return true;
 }

 // Print error only if we have "real" command and expect files
 if (!_exitAfterPrint && _pathnames.empty() && _settings->project.fileSettings.empty()) {
 PrintMessage("cppcheck: No C or C++ source files found.");
 return false;
 }

 // Use paths _pathnames if no base paths for relative path output are given
 if (_settings->basePaths.empty() && _settings->relativePaths)
 _settings->basePaths = _pathnames;

 return true;
}

void CmdLineParser::PrintHelp()
{
 std::cout << "Cppcheck - A tool for static C/C++ code analysis\n"
 "\n"
 "Syntax:\n"
 " cppcheck [OPTIONS] [files or paths]\n"
 "\n"
 "If a directory is given instead of a filename, *.cpp, *.cxx, *.cc, *.c++, *.c,\n"
 "*.tpp, and *.txx files are checked recursively from the given directory.\n\n"
 "Options:\n"
 " --cppcheck-build-dir=<dir>\n"
 " Analysis output directory. Useful for various data.\n"
 " Some possible usages are; whole program analysis,\n"
 " incremental analysis, distributed analysis.\n"
 " --check-config Check cppcheck configuration. The normal code\n"
 " analysis is disabled by this flag.\n"
 " --check-library Show information messages when library files have\n"
 " incomplete info.\n"
 " --config-exclude=<dir>\n"
 " Path (prefix) to be excluded from configuration\n"
 " checking. Preprocessor configurations defined in\n"
 " headers (but not sources) matching the prefix will not\n"
 " be considered for evaluation.\n"
 " --config-excludes-file=<file>\n"
 " A file that contains a list of config-excludes\n"
 " --dump Dump xml data for each translation unit. The dump\n"
 " files have the extension .dump and contain ast,\n"
 " tokenlist, symboldatabase, valueflow.\n"
 " -D<ID> Define preprocessor symbol. Unless --max-configs or\n"
 " --force is used, Cppcheck will only check the given\n"
 " configuration when -D is used.\n"
 " Example: '-DDEBUG=1 -D__cplusplus'.\n"
 " -U<ID> Undefine preprocessor symbol. Use -U to explicitly\n"
 " hide certain #ifdef <ID> code paths from checking.\n"
 " Example: '-UDEBUG'\n"
 " -E Print preprocessor output on stdout and don't do any\n"
 " further processing.\n"
 " --enable=<id> Enable additional checks. The available ids are:\n"
 " * all\n"
 " Enable all checks. It is recommended to only\n"
 " use --enable=all when the whole program is\n"
 " scanned, because this enables unusedFunction.\n"
 " * warning\n"
 " Enable warning messages\n"
 " * style\n"
 " Enable all coding style checks. All messages\n"
 " with the severities 'style', 'performance' and\n"
 " 'portability' are enabled.\n"
 " * performance\n"
 " Enable performance messages\n"
 " * portability\n"
 " Enable portability messages\n"
 " * information\n"
 " Enable information messages\n"
 " * unusedFunction\n"
 " Check for unused functions. It is recommend\n"
 " to only enable this when the whole program is\n"
 " scanned.\n"
 " * missingInclude\n"
 " Warn if there are missing includes. For\n"
 " detailed information, use '--check-config'.\n"
 " Several ids can be given if you separate them with\n"
 " commas. See also --std\n"
 " --error-exitcode=<n> If errors are found, integer [n] is returned instead of\n"
 " the default '0'. '" << EXIT_FAILURE << "' is returned\n"
 " if arguments are not valid or if no input files are\n"
 " provided. Note that your operating system can modify\n"
 " this value, e.g. '256' can become '0'.\n"
 " --errorlist Print a list of all the error messages in XML format.\n"
 " --doc Print a list of all available checks.\n"
 " --exitcode-suppressions=<file>\n"
 " Used when certain messages should be displayed but\n"
 " should not cause a non-zero exitcode.\n"
 " --file-list=<file> Specify the files to check in a text file. Add one\n"
 " filename per line. When file is '-,' the file list will\n"
 " be read from standard input.\n"
 " -f, --force Force checking of all configurations in files. If used\n"
 " together with '--max-configs=', the last option is the\n"
 " one that is effective.\n"
 " -h, --help Print this help.\n"
 " -I <dir> Give path to search for include files. Give several -I\n"
 " parameters to give several paths. First given path is\n"
 " searched for contained header files first. If paths are\n"
 " relative to source files, this is not needed.\n"
 " --includes-file=<file>\n"
 " Specify directory paths to search for included header\n"
 " files in a text file. Add one include path per line.\n"
 " First given path is searched for contained header\n"
 " files first. If paths are relative to source files,\n"
 " this is not needed.\n"
 " --include=<file>\n"
 " Force inclusion of a file before the checked file. Can\n"
 " be used for example when checking the Linux kernel,\n"
 " where autoconf.h needs to be included for every file\n"
 " compiled. Works the same way as the GCC -include\n"
 " option.\n"
 " -i <dir or file> Give a source file or source file directory to exclude\n"
 " from the check. This applies only to source files so\n"
 " header files included by source files are not matched.\n"
 " Directory name is matched to all parts of the path.\n"
 " --inconclusive Allow that Cppcheck reports even though the analysis is\n"
 " inconclusive.\n"
 " There are false positives with this option. Each result\n"
 " must be carefully investigated before you know if it is\n"
 " good or bad.\n"
 " --inline-suppr Enable inline suppressions. Use them by placing one or\n"
 " more comments, like: '// cppcheck-suppress warningId'\n"
 " on the lines before the warning to suppress.\n"
 " -j <jobs> Start <jobs> threads to do the checking simultaneously.\n"
#ifdef THREADING_MODEL_FORK
 " -l <load> Specifies that no new threads should be started if\n"
 " there are other threads running and the load average is\n"
 " at least <load>.\n"
#endif
 " --language=<language>, -x <language>\n"
 " Forces cppcheck to check all files as the given\n"
 " language. Valid values are: c, c++\n"
 " --library=<cfg> Load file <cfg> that contains information about types\n"
 " and functions. With such information Cppcheck\n"
 " understands your code better and therefore you\n"
 " get better results. The std.cfg file that is\n"
 " distributed with Cppcheck is loaded automatically.\n"
 " For more information about library files, read the\n"
 " manual.\n"
 " --output-file=<file> Write results to file, rather than standard error.\n"
 " --project=<file> Run Cppcheck on project. The <file> can be a Visual\n"
 " Studio Solution (*.sln), Visual Studio Project\n"
 " (*.vcxproj), or compile database\n"
 " (compile_commands.json). The files to analyse,\n"
 " include paths, defines, platform and undefines in\n"
 " the specified file will be used.\n"
 " --max-configs=<limit>\n"
 " Maximum number of configurations to check in a file\n"
 " before skipping it. Default is '12'. If used together\n"
 " with '--force', the last option is the one that is\n"
 " effective.\n"
 " --platform=<type>, --platform=<file>\n"
 " Specifies platform specific types and sizes. The\n"
 " available builtin platforms are:\n"
 " * unix32\n"
 " 32 bit unix variant\n"
 " * unix64\n"
 " 64 bit unix variant\n"
 " * win32A\n"
 " 32 bit Windows ASCII character encoding\n"
 " * win32W\n"
 " 32 bit Windows UNICODE character encoding\n"
 " * win64\n"
 " 64 bit Windows\n"
 " * avr8\n"
 " 8 bit AVR microcontrollers\n"
 " * native\n"
 " Type sizes of host system are assumed, but no\n"
 " further assumptions.\n"
 " * unspecified\n"
 " Unknown type sizes\n"
 " --plist-output=<path>\n"
 " Generate Clang-plist output files in folder.\n"
 " -q, --quiet Do not show progress reports.\n"
 " -rp, --relative-paths\n"
 " -rp=<paths>, --relative-paths=<paths>\n"
 " Use relative paths in output. When given, <paths> are\n"
 " used as base. You can separate multiple paths by ';'.\n"
 " Otherwise path where source files are searched is used.\n"
 " We use string comparison to create relative paths, so\n"
 " using e.g. ~ for home folder does not work. It is\n"
 " currently only possible to apply the base paths to\n"
 " files that are on a lower level in the directory tree.\n"
 " --report-progress Report progress messages while checking a file.\n"
#ifdef HAVE_RULES
 " --rule=<rule> Match regular expression.\n"
 " --rule-file=<file> Use given rule file. For more information, see: \n"
 " http://sourceforge.net/projects/cppcheck/files/Articles/\n"
#endif
 " --std=<id> Set standard.\n"
 " The available options are:\n"
 " * posix\n"
 " POSIX compatible code\n"
 " * c89\n"
 " C code is C89 compatible\n"
 " * c99\n"
 " C code is C99 compatible\n"
 " * c11\n"
 " C code is C11 compatible (default)\n"
 " * c++03\n"
 " C++ code is C++03 compatible\n"
 " * c++11\n"
 " C++ code is C++11 compatible\n"
 " * c++14\n"
 " C++ code is C++14 compatible (default)\n"
 " More than one --std can be used:\n"
 " 'cppcheck --std=c99 --std=posix file.c'\n"
 " --suppress=<spec> Suppress warnings that match <spec>. The format of\n"
 " <spec> is:\n"
 " [error id]:[filename]:[line]\n"
 " The [filename] and [line] are optional. If [error id]\n"
 " is a wildcard '*', all error ids match.\n"
 " --suppressions-list=<file>\n"
 " Suppress warnings listed in the file. Each suppression\n"
 " is in the same format as <spec> above.\n"
 " --template='<text>' Format the error messages. E.g.\n"
 " '{file}:{line},{severity},{id},{message}' or\n"
 " '{file}({line}):({severity}) {message}' or\n"
 " '{callstack} {message}'\n"
 " Pre-defined templates: gcc, vs, edit.\n"
 " -v, --verbose Output more detailed error information.\n"
 " --version Print out version number.\n"
 " --xml Write results in xml format to error stream (stderr).\n"
 " --xml-version=<version>\n"
 " Select the XML file version. Currently only versions 2 is available."
 "\n"
 "Example usage:\n"
 " # Recursively check the current folder. Print the progress on the screen and\n"
 " # write errors to a file:\n"
 " cppcheck . 2> err.txt\n"
 "\n"
 " # Recursively check ../myproject/ and don't print progress:\n"
 " cppcheck --quiet ../myproject/\n"
 "\n"
 " # Check test.cpp, enable all checks:\n"
 " cppcheck --enable=all --inconclusive --std=posix test.cpp\n"
 "\n"
 " # Check f.cpp and search include files from inc1/ and inc2/:\n"
 " cppcheck -I inc1/ -I inc2/ f.cpp\n"
 "\n"
 "For more information:\n"
 " http://cppcheck.net/manual.pdf\n";
}