From 1b6a04ca5504955c571d1c97504fb45ea0befee4 Mon Sep 17 00:00:00 2001 From: Valentin Popov Date: Mon, 8 Jan 2024 01:21:28 +0400 Subject: Initial vendor packages Signed-off-by: Valentin Popov --- vendor/rustix/src/termios/tty.rs | 84 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 vendor/rustix/src/termios/tty.rs (limited to 'vendor/rustix/src/termios/tty.rs') diff --git a/vendor/rustix/src/termios/tty.rs b/vendor/rustix/src/termios/tty.rs new file mode 100644 index 0000000..b14e602 --- /dev/null +++ b/vendor/rustix/src/termios/tty.rs @@ -0,0 +1,84 @@ +//! Functions which operate on file descriptors which might be terminals. + +use crate::backend; +use backend::fd::AsFd; +#[cfg(all(feature = "alloc", feature = "procfs"))] +#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))] +use { + crate::ffi::CString, crate::io, crate::path::SMALL_PATH_BUFFER_SIZE, alloc::vec::Vec, + backend::fd::BorrowedFd, +}; + +/// `isatty(fd)`—Tests whether a file descriptor refers to a terminal. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/isatty.html +/// [Linux]: https://man7.org/linux/man-pages/man3/isatty.3.html +#[inline] +pub fn isatty(fd: Fd) -> bool { + backend::termios::syscalls::isatty(fd.as_fd()) +} + +/// `ttyname_r(fd)` +/// +/// If `reuse` already has available capacity, reuse it if possible. +/// +/// # References +/// - [POSIX] +/// - [Linux] +/// +/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/ttyname.html +/// [Linux]: https://man7.org/linux/man-pages/man3/ttyname.3.html +#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))] +#[cfg(all(feature = "alloc", feature = "procfs"))] +#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))] +#[doc(alias = "ttyname_r")] +#[inline] +pub fn ttyname>>(dirfd: Fd, reuse: B) -> io::Result { + _ttyname(dirfd.as_fd(), reuse.into()) +} + +#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))] +#[cfg(all(feature = "alloc", feature = "procfs"))] +#[allow(unsafe_code)] +fn _ttyname(dirfd: BorrowedFd<'_>, mut buffer: Vec) -> io::Result { + buffer.clear(); + buffer.reserve(SMALL_PATH_BUFFER_SIZE); + + loop { + match backend::termios::syscalls::ttyname(dirfd, buffer.spare_capacity_mut()) { + Err(io::Errno::RANGE) => { + // Use `Vec` reallocation strategy to grow capacity + // exponentially. + buffer.reserve(buffer.capacity() + 1); + } + Ok(len) => { + // SAFETY: Assume the backend returns the length of the string + // excluding the NUL. + unsafe { + buffer.set_len(len + 1); + } + + // SAFETY: + // - “ttyname_r stores this pathname in the buffer buf” + // - [POSIX definition 3.271: Pathname]: “A string that is used + // to identify a file.” + // - [POSIX definition 3.375: String]: “A contiguous sequence + // of bytes terminated by and including the first null byte.” + // + // Thus, there will be a single NUL byte at the end of the + // string. + // + // [POSIX definition 3.271: Pathname]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_271 + // [POSIX definition 3.375: String]: https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_375 + unsafe { + return Ok(CString::from_vec_with_nul_unchecked(buffer)); + } + } + Err(errno) => return Err(errno), + } + } +} -- cgit v1.2.3