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#ifndef MLIBC_FILE_IO_HPP
#define MLIBC_FILE_IO_HPP
#include <stdio.h>
#include <mlibc/lock.hpp>
#include <mlibc/allocator.hpp>
#include <frg/list.hpp>
namespace mlibc {
enum class stream_type {
unknown,
file_like,
pipe_like
};
enum class buffer_mode {
unknown,
no_buffer,
line_buffer,
full_buffer
};
struct abstract_file : __mlibc_file_base {
public:
abstract_file(void (*do_dispose)(abstract_file *) = nullptr);
abstract_file(const abstract_file &) = delete;
abstract_file &operator= (const abstract_file &) = delete;
virtual ~abstract_file();
void dispose();
virtual int close() = 0;
virtual int reopen(const char *path, const char *mode) = 0;
int read(char *buffer, size_t max_size, size_t *actual_size);
int write(const char *buffer, size_t max_size, size_t *actual_size);
int unget(char c);
int update_bufmode(buffer_mode mode);
void purge();
int flush();
int tell(off_t *current_offset);
int seek(off_t offset, int whence);
protected:
virtual int determine_type(stream_type *type) = 0;
virtual int determine_bufmode(buffer_mode *mode) = 0;
virtual int io_read(char *buffer, size_t max_size, size_t *actual_size) = 0;
virtual int io_write(const char *buffer, size_t max_size, size_t *actual_size) = 0;
virtual int io_seek(off_t offset, int whence, off_t *new_offset) = 0;
int _reset();
private:
int _init_type();
int _init_bufmode();
int _write_back();
int _save_pos();
void _ensure_allocation();
stream_type _type;
buffer_mode _bufmode;
void (*_do_dispose)(abstract_file *);
public:
// lock for file operations
RecursiveFutexLock _lock;
// All files are stored in a global linked list, so that they can be flushed at exit().
frg::default_list_hook<abstract_file> _list_hook;
};
struct fd_file : abstract_file {
fd_file(int fd, void (*do_dispose)(abstract_file *) = nullptr, bool force_unbuffered = false);
int fd();
int close() override;
int reopen(const char *path, const char *mode) override;
static int parse_modestring(const char *mode);
protected:
int determine_type(stream_type *type) override;
int determine_bufmode(buffer_mode *mode) override;
int io_read(char *buffer, size_t max_size, size_t *actual_size) override;
int io_write(const char *buffer, size_t max_size, size_t *actual_size) override;
int io_seek(off_t offset, int whence, off_t *new_offset) override;
private:
// Underlying file descriptor.
int _fd;
bool _force_unbuffered;
};
template <typename T>
void file_dispose_cb(abstract_file *base) {
frg::destruct(getAllocator(), static_cast<T *>(base));
}
} // namespace mlibc
#endif // MLIBC_FILE_IO_HPP
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