[PATCH v5 06/18] rust: str: add `bytes_to_bool` helper function
From: Andreas Hindborg <a.hindborg@kernel.org>
Date: 2025-08-15 07:32:18
Also in:
lkml, rust-for-linux
Subsystem:
rust, the rest · Maintainers:
Miguel Ojeda, Linus Torvalds
Add a convenience function to convert byte slices to boolean values by wrapping them in a null-terminated C string and delegating to the existing `kstrtobool` function. Only considers the first two bytes of the input slice, following the kernel's boolean parsing semantics. Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org> --- rust/kernel/str.rs | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 5611f7846dc0..ced1cb639efc 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs@@ -978,6 +978,16 @@ pub fn kstrtobool(string: &CStr) -> Result<bool> { kernel::error::to_result(ret).map(|()| result) } +/// Convert `&[u8]` to `bool` by deferring to [`kernel::str::kstrtobool`]. +/// +/// Only considers at most the first two bytes of `bytes`. +pub fn bytes_to_bool(bytes: &[u8]) -> Result<bool> { + // `ktostrbool` only considers the first two bytes of the input. + let nbuffer = [*bytes.first().unwrap_or(&0), *bytes.get(1).unwrap_or(&0), 0]; + let c_str = CStr::from_bytes_with_nul(nbuffer.split_inclusive(|c| *c == 0).next().unwrap())?; + kstrtobool(c_str) +} + /// An owned string that is guaranteed to have exactly one `NUL` byte, which is at the end. /// /// Used for interoperability with kernel APIs that take C strings.
--
2.47.2