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// Cppcheck - A tool for static C/C++ code analysis
// Copyright (C) 2007-2024 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/>.
#ifndef REDIRECT_H
#define REDIRECT_H
#include <iostream>
#include <sstream>
#include <stdexcept>
#include <string>
/**
* @brief Utility class for capturing cout and cerr to ostringstream buffers
* for later use. Uses RAII to stop redirection when the object goes out of
* scope.
* NOTE: This is *not* thread-safe.
*/
class RedirectOutputError {
public:
/** Set up redirection, flushing anything in the pipes. */
RedirectOutputError() {
// flush all old output
std::cout.flush();
std::cerr.flush();
_oldCout = std::cout.rdbuf(); // back up cout's streambuf
_oldCerr = std::cerr.rdbuf(); // back up cerr's streambuf
std::cout.rdbuf(_out.rdbuf()); // assign streambuf to cout
std::cerr.rdbuf(_err.rdbuf()); // assign streambuf to cerr
}
/** Revert cout and cerr behaviour */
~RedirectOutputError() noexcept(false) {
std::cout.rdbuf(_oldCout); // restore cout's original streambuf
std::cerr.rdbuf(_oldCerr); // restore cerrs's original streambuf
{
const std::string s = _out.str();
if (!s.empty())
throw std::runtime_error("unconsumed stdout: " + s); // cppcheck-suppress exceptThrowInDestructor - FP #11031
}
{
const std::string s = _err.str();
if (!s.empty())
throw std::runtime_error("consumed stderr: " + s);
}
}
/** Return what would be printed to cout. */
std::string getOutput() {
std::string s = _out.str();
_out.str("");
return s;
}
/** Return what would be printed to cerr. */
std::string getErrout() {
std::string s = _err.str();
_err.str("");
return s;
}
private:
std::ostringstream _out;
std::ostringstream _err;
std::streambuf *_oldCout;
std::streambuf *_oldCerr;
};
class SuppressOutput {
public:
/** Set up suppression, flushing anything in the pipes. */
SuppressOutput() {
// flush all old output
std::cout.flush();
std::cerr.flush();
_oldCout = std::cout.rdbuf(); // back up cout's streambuf
_oldCerr = std::cerr.rdbuf(); // back up cerr's streambuf
std::cout.rdbuf(nullptr); // disable cout
std::cerr.rdbuf(nullptr); // disable cerr
}
/** Revert cout and cerr behaviour */
~SuppressOutput() {
std::cout.rdbuf(_oldCout); // restore cout's original streambuf
std::cerr.rdbuf(_oldCerr); // restore cerrs's original streambuf
}
private:
std::streambuf *_oldCout;
std::streambuf *_oldCerr;
};
#define REDIRECT RedirectOutputError redir
#define GET_REDIRECT_OUTPUT redir.getOutput()
#define GET_REDIRECT_ERROUT redir.getErrout()
#define SUPPRESS SuppressOutput supprout
class RedirectInput {
public:
explicit RedirectInput(const std::string &input) : _in(input) {
_oldCin = std::cin.rdbuf(); // back up cin's streambuf
std::cin.rdbuf(_in.rdbuf()); // assign streambuf to cin
}
~RedirectInput() noexcept {
std::cin.rdbuf(_oldCin); // restore cin's original streambuf
}
private:
std::istringstream _in;
std::streambuf* _oldCin;
};
#endif
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