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#ifndef LOGFILE_INCLUDED
#define LOGFILE_INCLUDED
// Copyright (c) 2018, 2025, Oracle and/or its affiliates.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License, version 2.0,
// as published by the Free Software Foundation.
//
// This program is designed to work with certain software (including
// but not limited to OpenSSL) that is licensed under separate terms,
// as designated in a particular file or component or in included license
// documentation. The authors of MySQL hereby grant you an additional
// permission to link the program and your derivative works with the
// separately licensed software that they have either included with
// the program or referenced in the documentation.
//
// 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, version 2.0, for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
/// @file
///
/// This file declares the Log file class.
#include "my_io.h"
#include "my_sys.h"
class Logfile {
public:
Logfile();
Logfile(const Logfile &) = default;
virtual ~Logfile() { close(); }
/// Return file name.
///
/// @retval Name of the file.
const char *file_name() const { return m_filename; }
/// Return number bytes written into a log file.
///
/// @retval Number bytes written into a log file.
std::size_t bytes_written() const { return m_bytes_written; }
/// Flush any unwritten content from the stream's buffer to the
/// associated file.
///
/// @retval False if successful, true otherwise.
bool flush();
/// Construct a file path using directory name, file name and extension
/// arguments and open it in write/update mode.
///
/// @param dirname Directory name
/// @param filename File name
/// @param ext Extension name
///
/// @retval False if successful, true otherwise.
bool open(const char *dirname, const char *filename, const char *ext);
/// Write the contents in data array to a file.
///
/// @param data Pointer to the array to be written
/// @param length Length of the buffer
///
/// @retval False if successful, true otherwise.
bool write(const char *data, std::size_t length);
/// Print the last N number of lines from a file to stderr.
///
/// @param lines Number of lines
void show_tail(unsigned int lines);
private:
/// Close the given file stream.
void close();
char m_filename[FN_REFLEN];
FILE *m_file;
std::size_t m_bytes_written;
};
#endif // LOGFILE_INCLUDED
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