Commit 5928642b authored by Andreas Hindborg's avatar Andreas Hindborg Committed by Miguel Ojeda
Browse files

rust: str: implement `strip_prefix` for `BStr` 



Implement `strip_prefix` for `BStr` by deferring to `slice::strip_prefix`
on the underlying `&[u8]`.

Reviewed-by: default avatarGary Guo <gary@garyguo.net>
Reviewed-by: default avatarAlice Ryhl <aliceryhl@google.com>
Reviewed-by: default avatarDaniel Almeida <daniel.almeida@collabora.com>
Tested-by: default avatarDaniel Almeida <daniel.almeida@collabora.com>
Signed-off-by: default avatarAndreas Hindborg <a.hindborg@kernel.org>
Tested-by: default avatarDaniel Gomez <da.gomez@samsung.com>
Link: https://lore.kernel.org/r/20250227-module-params-v3-v8-4-ceeee85d9347@kernel.org


[ Pluralized section name. Hid `use`. - Miguel ]
Signed-off-by: default avatarMiguel Ojeda <ojeda@kernel.org>
parent d2e3f798

rust/kernel/str.rs

+17 −0
Original line number Diff line number Diff line
@@ -31,6 +31,23 @@ pub const fn from_bytes(bytes: &[u8]) -> &Self { 
        // SAFETY: `BStr` is transparent to `[u8]`.

        unsafe { &*(bytes as *const [u8] as *const BStr) }

    }



    /// Strip a prefix from `self`. Delegates to [`slice::strip_prefix`].

    ///

    /// # Examples

    ///

    /// ```

    /// # use kernel::b_str;

    /// assert_eq!(Some(b_str!("bar")), b_str!("foobar").strip_prefix(b_str!("foo")));

    /// assert_eq!(None, b_str!("foobar").strip_prefix(b_str!("bar")));

    /// assert_eq!(Some(b_str!("foobar")), b_str!("foobar").strip_prefix(b_str!("")));

    /// assert_eq!(Some(b_str!("")), b_str!("foobar").strip_prefix(b_str!("foobar")));

    /// ```

    pub fn strip_prefix(&self, pattern: impl AsRef<Self>) -> Option<&BStr> {

        self.deref()

            .strip_prefix(pattern.as_ref().deref())

            .map(Self::from_bytes)

    }

}



impl fmt::Display for BStr {