Merging upstream version 1.73.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/vendor/rustix-0.37.22/src/process/chdir.rs b/vendor/rustix-0.37.22/src/process/chdir.rs
new file mode 100644
index 000000000..4951e5670
--- /dev/null
+++ b/vendor/rustix-0.37.22/src/process/chdir.rs
@@ -0,0 +1,72 @@
+use crate::ffi::CString;
+use crate::path::SMALL_PATH_BUFFER_SIZE;
+use crate::{backend, io, path};
+use alloc::vec::Vec;
+#[cfg(not(target_os = "fuchsia"))]
+use backend::fd::AsFd;
+
+/// `chdir(path)`—Change the current working directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/chdir.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/chdir.2.html
+#[inline]
+pub fn chdir<P: path::Arg>(path: P) -> io::Result<()> {
+    path.into_with_c_str(backend::process::syscalls::chdir)
+}
+
+/// `fchdir(fd)`—Change the current working directory.
+///
+/// # References
+///  - [POSIX]
+///  - [Linux]
+///
+/// [POSIX]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/fchdir.html
+/// [Linux]: https://man7.org/linux/man-pages/man2/fchdir.2.html
+#[cfg(not(target_os = "fuchsia"))]
+#[inline]
+pub fn fchdir<Fd: AsFd>(fd: Fd) -> io::Result<()> {
+    backend::process::syscalls::fchdir(fd.as_fd())
+}
+
+/// `getcwd()`—Return the current working directory.
+///
+/// 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/getcwd.html
+/// [Linux]: https://man7.org/linux/man-pages/man3/getcwd.3.html
+#[cfg(not(target_os = "wasi"))]
+#[inline]
+pub fn getcwd<B: Into<Vec<u8>>>(reuse: B) -> io::Result<CString> {
+    _getcwd(reuse.into())
+}
+
+fn _getcwd(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 backend::process::syscalls::getcwd(&mut buffer) {
+            Err(io::Errno::RANGE) => {
+                buffer.reserve(1); // use `Vec` reallocation strategy to grow capacity exponentially
+                buffer.resize(buffer.capacity(), 0_u8);
+            }
+            Ok(_) => {
+                let len = buffer.iter().position(|x| *x == b'\0').unwrap();
+                buffer.resize(len, 0_u8);
+                return Ok(CString::new(buffer).unwrap());
+            }
+            Err(errno) => return Err(errno),
+        }
+    }
+}