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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Forward.h>
#include <LibCore/Object.h>
namespace Core {
// This is not necessarily a valid iterator in all contexts,
// if we had concepts, this would be InputIterator, not Copyable, Movable.
class LineIterator {
AK_MAKE_NONCOPYABLE(LineIterator);
public:
explicit LineIterator(IODevice&, bool is_end = false);
bool operator==(const LineIterator& other) const { return &other == this || (at_end() && other.is_end()) || (other.at_end() && is_end()); }
bool is_end() const { return m_is_end; }
bool at_end() const;
LineIterator& operator++();
StringView operator*() const { return m_buffer; }
private:
NonnullRefPtr<IODevice> m_device;
bool m_is_end { false };
String m_buffer;
};
class IODevice : public Object {
C_OBJECT_ABSTRACT(IODevice)
public:
enum OpenMode {
NotOpen = 0,
ReadOnly = 1,
WriteOnly = 2,
ReadWrite = 3,
Append = 4,
Truncate = 8,
MustBeNew = 16,
};
virtual ~IODevice() override;
int fd() const { return m_fd; }
unsigned mode() const { return m_mode; }
bool is_open() const { return m_mode != NotOpen; }
bool eof() const { return m_eof; }
int error() const { return m_error; }
const char* error_string() const;
bool has_error() const { return m_error != 0; }
int read(u8* buffer, int length);
ByteBuffer read(size_t max_size);
ByteBuffer read_all();
String read_line(size_t max_size = 16384);
bool write(const u8*, int size);
bool write(const StringView&);
bool truncate(off_t);
bool can_read_line() const;
bool can_read() const;
enum class SeekMode {
SetPosition,
FromCurrentPosition,
FromEndPosition,
};
bool seek(i64, SeekMode = SeekMode::SetPosition, off_t* = nullptr);
virtual bool open(IODevice::OpenMode) = 0;
virtual bool close();
int printf(const char*, ...);
LineIterator line_begin() & { return LineIterator(*this); }
LineIterator line_end() { return LineIterator(*this, true); }
protected:
explicit IODevice(Object* parent = nullptr);
void set_fd(int);
void set_mode(OpenMode mode) { m_mode = mode; }
void set_error(int error) const { m_error = error; }
void set_eof(bool eof) const { m_eof = eof; }
virtual void did_update_fd(int) { }
private:
bool populate_read_buffer() const;
bool can_read_from_fd() const;
int m_fd { -1 };
OpenMode m_mode { NotOpen };
mutable int m_error { 0 };
mutable bool m_eof { false };
mutable Vector<u8> m_buffered_data;
};
}
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