exceptions.hpp

/*********************************************************************/
// webdar - a web server and interface program to libdar
// Copyright (C) 2013-2025 Denis Corbin
//
// This file is part of Webdar
//
//  Webdar 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.
//
//  Webdar 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 Webdar.  If not, see <http://www.gnu.org/licenses/>
//
//----
//  to contact the author: dar.linux@free.fr
/*********************************************************************/
 
#ifndef EXCEPTIONS_HPP
#define EXCEPTIONS_HPP
 
    // C system header files
#include "my_config.h"
extern "C"
{
#if HAVE_STRING_H
#include <string.h>
#endif
}
 
    // C++ system header files
#include <string>
#include <new>
 
    // libraries header files
#include <dar/libdar.hpp>
 
 
 
class exception_base
{
public:
    exception_base(const std::string & x_msg) {msg = x_msg; };
 
    virtual ~exception_base() {};
 
    const std::string & get_message() const { return msg; };
    void change_message(const std::string & x_msg) { msg = x_msg; };
 
    virtual exception_base *clone() const = 0;
 
private:
    std::string msg;
};
 
 
 
 
class exception_memory : public exception_base
{
public:
    exception_memory() : exception_base("lack of memory") {};
 
protected:
    virtual exception_base *clone() const override;
};
 
template<class T> exception_base *cloner(void * const ptr) { exception_base *ret = new (std::nothrow) T(*(reinterpret_cast<T const *>(ptr))); if(ret == nullptr) throw exception_memory(); return ret; };
 
inline exception_base * exception_memory::clone() const { return cloner<exception_memory>((void *)this); };
 
 
#define WEBDAR_BUG exception_bug(__FILE__, __LINE__)
 
 
class exception_bug : public exception_base
{
public:
    exception_bug(const std::string & file, int line) : exception_base(std::string("WEBDAR: BUG MET IN File ") + file + std::string(" line ") + std::to_string(line)) {};
 
protected:
    virtual exception_base *clone() const override { return cloner<exception_bug>((void *)this); };
};
 
 
 
class exception_system : public exception_base
{
public:
    exception_system(const std::string & context, int error_code);
 
protected:
    virtual exception_base *clone() const override { return cloner<exception_system>((void *)this); };
};
 
 
class exception_range : public exception_base
{
public:
    exception_range(const std::string & msg): exception_base(msg) {};
 
protected:
    virtual exception_base *clone() const override { return cloner<exception_range>((void *)this); };
};
 
 
class exception_input : public exception_base
{
public:
    exception_input(const std::string & msg, unsigned int error_code): exception_base(msg) {err = error_code; };
    unsigned int get_error_code() const { return err; };
 
protected:
    virtual exception_base *clone() const override { return cloner<exception_input>((void *)this); };
 
private:
    unsigned int err;
};
 
 
 
class exception_feature : public exception_base
{
public:
    exception_feature(const std::string & feature_name): exception_base(std::string("Unimplemented feature: ") + feature_name) {};
 
protected:
    virtual exception_base *clone() const override { return cloner<exception_feature>((void *)this); };
};
 
 
class exception_libcall : public exception_base
{
public:
    exception_libcall(const libdar::Egeneric & e);
 
protected:
    virtual exception_base *clone() const override { return cloner<exception_libcall>((void *)this); };
};
 
 
class exception_openssl : public exception_base
{
public:
    exception_openssl();
 
protected:
    virtual exception_base *clone() const override { return cloner<exception_openssl>((void *)this); };
 
private:
    static constexpr unsigned int ERR_BUF_LEN = 1024;
 
    static std::string get_ssl_error();
};
 
 
class exception_signal: public exception_base
{
public:
    exception_signal(): exception_base("system call interruted by a signal") {};
 
protected:
    virtual exception_base *clone() const override { return cloner<exception_signal>((void *)this); };
};
 
 
extern void throw_as_most_derivated_class(exception_base *ebase);
 
#endif