1 files changed, 72 insertions, 0 deletions
diff --git a/vendor/rustix/src/termios/tty.rs b/vendor/rustix/src/termios/tty.rs
new file mode 100644
index 000000000..1651a3c3b
--- /dev/null
+++ b/vendor/rustix/src/termios/tty.rs
@@ -0,0 +1,72 @@
+//! Functions which operate on file descriptors which might be terminals.
+
+use crate::imp;
+#[cfg(any(
+    all(linux_raw, feature = "procfs"),
+    all(libc, not(any(target_os = "fuchsia", target_os = "wasi"))),
+))]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))]
+use crate::io;
+use imp::fd::AsFd;
+#[cfg(any(
+    all(linux_raw, feature = "procfs"),
+    all(libc, not(any(target_os = "fuchsia", target_os = "wasi"))),
+))]
+use {
+    crate::ffi::CString, crate::path::SMALL_PATH_BUFFER_SIZE, alloc::vec::Vec, imp::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: AsFd>(fd: Fd) -> bool {
+    imp::termios::syscalls::isatty(fd.as_fd())
+}
+
+/// `ttyname_r(fd)`
+///
+/// If `reuse` is non-empty, reuse its buffer to store the result 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(feature = "procfs")]
+#[cfg_attr(doc_cfg, doc(cfg(feature = "procfs")))]
+#[inline]
+pub fn ttyname<Fd: AsFd, B: Into<Vec<u8>>>(dirfd: Fd, reuse: B) -> io::Result<CString> {
+    _ttyname(dirfd.as_fd(), reuse.into())
+}
+
+#[cfg(not(any(target_os = "fuchsia", target_os = "wasi")))]
+#[cfg(feature = "procfs")]
+fn _ttyname(dirfd: BorrowedFd<'_>, mut buffer: Vec<u8>) -> io::Result<CString> {
+    // This code would benefit from having a better way to read into
+    // uninitialized memory, but that requires `unsafe`.
+    buffer.clear();
+    buffer.reserve(SMALL_PATH_BUFFER_SIZE);
+    buffer.resize(buffer.capacity(), 0_u8);
+
+    loop {
+        match imp::termios::syscalls::ttyname(dirfd, &mut buffer) {
+            Err(io::Errno::RANGE) => {
+                buffer.reserve(1); // use `Vec` reallocation strategy to grow capacity exponentially
+                buffer.resize(buffer.capacity(), 0_u8);
+            }
+            Ok(len) => {
+                buffer.resize(len, 0_u8);
+                return Ok(CString::new(buffer).unwrap());
+            }
+            Err(errno) => return Err(errno),
+        }
+    }
+}