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rust: str: implement strip_prefix for BStr

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

Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Tested-by: Daniel Almeida <daniel.almeida@collabora.com>
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
Tested-by: Daniel 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: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Andreas Hindborg 2025-02-27 15:38:10 +01:00 committed by Miguel Ojeda
parent d2e3f7987d
commit 5928642b11
1 changed files with 17 additions and 0 deletions
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17
rust/kernel/str.rs
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@ -31,6 +31,23 @@ impl BStr {
// 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 {