lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 111 insertions, 0 deletions

diff --git a/lib/mlibc/options/ansi/include/mlibc/file-io.hpp b/lib/mlibc/options/ansi/include/mlibc/file-io.hpp
new file mode 100644
index 0000000..1155a2b
--- /dev/null
+++ b/lib/mlibc/options/ansi/include/mlibc/file-io.hpp
@@ -0,0 +1,111 @@
+#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