implemnts the equivalent of the rust std's Vec::resize on the kernel's Vec type. Signed-off-by: Andrew Ballance <andrewjballance@xxxxxxxxx> --- rust/kernel/alloc/kvec.rs | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/rust/kernel/alloc/kvec.rs b/rust/kernel/alloc/kvec.rs index 75e9feebb81f..cbfef2e56f9c 100644 --- a/rust/kernel/alloc/kvec.rs +++ b/rust/kernel/alloc/kvec.rs @@ -554,6 +554,31 @@ pub fn from_elem(value: T, n: usize, flags: Flags) -> Result<Self, AllocError> { Ok(v) } + + /// Resizes the [`Vec`] so that `len` is equal to `new_len`. + /// + /// If `new_len` is smaller than `len`, the `Vec` is [`Vec::truncate`]d. + /// If `new_len` is larger, each new slot is filled with clones of `value`. + /// + /// # Example + /// ``` + /// let mut v = kernel::kvec![1, 2, 3]?; + /// v.resize(1, 42, GFP_KERNEL)?; + /// assert_eq!(&v, &[1]); + /// + /// v.resize(3, 42, GFP_KERNEL)?; + /// assert_eq!(&v, &[1, 42, 42]); + /// + /// # Ok::<(), Error>(()) + /// ``` + pub fn resize(&mut self, new_len: usize, value: T, flags: Flags) -> Result<(), AllocError> { + if new_len > self.len() { + self.extend_with(new_len - self.len(), value, flags) + } else { + self.truncate(new_len); + Ok(()) + } + } } impl<T, A> Drop for Vec<T, A> -- 2.48.1