Struct libnotcurses_sys::NcFile

pub struct NcFile { /* private fields */ }

A wrapper struct around libc::FILE

The notcurses’ FILE type is a transparent struct, while the equivalent libc’s FILE is an opaque enum.

Several methods are provided to cast back and forth between both types, in order to allow both rust libc operations and notcurses file operations over the same underlying *FILE.

Implementations

impl NcFile

Constants

pub const RANDOM_ACCESS_MODE: &'static str

Intended to be passed into the CFile::open method. It will open the file in a way that will allow reading and writing, including overwriting old data. It will not create the file if it does not exist.

pub const UPDATE: &'static str

Intended to be passed into the CFile::open method. It will open the file in a way that will allow reading and writing, including overwriting old data

pub const READ_ONLY: &'static str

Intended to be passed into the CFile::open method. It will only allow reading.

pub const WRITE_ONLY: &'static str

Intended to be passed into the CFile::open method. It will only allow writing.

pub const APPEND_ONLY: &'static str

Intended to be passed into the CFile::open method. It will only allow data to be appended to the end of the file.

pub const APPEND_READ: &'static str

Intended to be passed into the CFile::open method. It will allow data to be appended to the end of the file, and data to be read from the file. It will create the file if it doesn’t exist.

pub const TRUNCATE_RANDOM_ACCESS_MODE: &'static str

Intended to be passed into the CFile::open method. It will open the file in a way that will allow reading and writing, including overwriting old data. It will create the file if it doesn’t exist

impl NcFile

Constructors

pub fn from_nc(file: *mut FILE) -> Self

NcFile constructor from a file produced by notcurses.

pub unsafe fn from_libc(file: *mut FILE) -> Self

NcFile constructor from a file produced by the libc crate.

impl NcFile

Methods

pub fn as_libc_ptr(&self) -> *mut FILE

Returns the file pointer in the format expected by the libc crate.

pub fn as_nc_ptr(&self) -> *mut FILE

Returns the file pointer in the format expected by notcurses.

pub fn current_pos(&self) -> Result<u64, Error>

Returns the current position in the file.

On error Error::Errno(errno) is returned.

pub fn read_all(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

Reads the file from start to end. Convenience method.

Trait Implementations

impl Debug for NcFile

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Drop for NcFile

fn drop(&mut self)

Ensures the file stream is closed before abandoning the data.

impl Read for NcFile

fn read(&mut self, buf: &mut [u8]) -> Result<usize, Error>

Reads exactly the number of bytes required to fill buf.

If the end of the file is reached before buf is filled, Err(EndOfFile(bytes_read)) will be returned. The data that was read before that will still have been placed into buf.

Upon some other error, Err(Errno(errno)) will be returned.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize, Error>

Reads the entire file starting from the current_position expanding buf as needed.

On a successful read, this function will return Ok(bytes_read).

If an error occurs during reading, some varient of error will be returned.

fn read_to_string(&mut self, strbuf: &mut String) -> Result<usize, Error>

Reads the entire file from the beginning and stores it in a string.

On a successful read, this function will return Ok(bytes_read).

If an error occurs during reading, some varient of error will be returned.

fn read_exact(&mut self, buf: &mut [u8]) -> Result<(), Error>

Reads exactly the number of bytes required to fill buf.

If the end of the file is reached before buf is filled, Err(EndOfFile(bytes_read)) will be returned. The data that was read before that will still have been placed into buf.

Upon some other error, Err(Errno(errno)) will be returned.

fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> Result<usize, Error>

Like read, except that it reads into a slice of buffers.

fn is_read_vectored(&self) -> bool

🔬 This is a nightly-only experimental API. (can_vector)

Determines if this Reader has an efficient read_vectored implementation.

fn read_buf(&mut self, buf: &mut ReadBuf<'_>) -> Result<(), Error>

🔬 This is a nightly-only experimental API. (read_buf)

Pull some bytes from this source into the specified buffer.

fn read_buf_exact(&mut self, buf: &mut ReadBuf<'_>) -> Result<(), Error>

🔬 This is a nightly-only experimental API. (read_buf)

Read the exact number of bytes required to fill buf.

fn by_ref(&mut self) -> &mut Self

Creates a “by reference” adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>

Transforms this Read instance to an Iterator over its bytes.

fn chain<R>(self, next: R) -> Chain<Self, R> where
    R: Read, 

Creates an adapter which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

Creates an adapter which will read at most limit bytes from it.

impl Seek for NcFile

fn seek(&mut self, pos: SeekFrom) -> Result<u64, Error>

Changes the current position in the file using the SeekFrom enum.

To set relative to the beginning of the file (i.e. index is 0 + offset):

SeekFrom::Start(offset)

To set relative to the end of the file (i.e. index is file_lenth - 1 - offset):

SeekFrom::End(offset)

To set relative to the current position:

SeekFrom::End(offset)

On error Error::Errno(errno) is returned.

fn rewind(&mut self) -> Result<(), Error>

Rewind to the beginning of a stream.

fn stream_len(&mut self) -> Result<u64, Error>

🔬 This is a nightly-only experimental API. (seek_stream_len)

Returns the length of this stream (in bytes).

fn stream_position(&mut self) -> Result<u64, Error>

Returns the current seek position from the start of the stream.