libc_error.hpp

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/*
   By Ignacio Riquelme Morelle <[email protected]>
   Part of the Battle for Wesnoth Project http://www.wesnoth.org/

   The contents of this file are placed in the public domain.
 */

#include <exception>
#include <cerrno>
#include <cstring>
#include <string>

#ifndef LIBC_ERROR_HPP_INCLUDED
#define LIBC_ERROR_HPP_INCLUDED

/**
 * Exception type used to propagate C runtime errors across functions.
 */
class libc_error : public std::exception
{
public:
    libc_error()
        : e_(errno)
        , desc_(strerror(e_))
        , msg_("C library error: " + desc_)
    {
    }

    virtual ~libc_error() throw()
    {
    }

    /** Returns the value of @a errno at the time the exception was thrown. */
    int num() const
    {
        return e_;
    }

    /** Returns an explanatory string describing the runtime error alone. */
    const std::string& desc() const
    {
        return desc_;
    }

    /** Returns an explanatory string describing the exception. */
    const char* what() const throw()
    {
        return msg_.c_str();
    }

private:
    int e_;
    std::string desc_;
    std::string msg_;
};

#endif