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| author | Andreas Hindborg <a.hindborg@kernel.org> | 2025-02-27 15:38:10 +0100 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2025-03-20 21:44:47 +0100 |
| commit | 5928642b11cb6aee8f6250c762857e713e7112da (patch) | |
| tree | d31fb61e1e3b6a18dc299f1073db497a2e693e8e /rust | |
| parent | d2e3f7987d03c6abeeb8890540569c87999bdcc1 (diff) | |
rust: str: implement `strip_prefix` for `BStr`
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>
Diffstat (limited to 'rust')
| -rw-r--r-- | rust/kernel/str.rs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs index c6bd2c69543d..878111cb77bc 100644 --- a/rust/kernel/str.rs +++ b/rust/kernel/str.rs @@ -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 { |