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authorGary Guo <gary@garyguo.net>2022-11-10 17:41:27 +0100
committerMiguel Ojeda <ojeda@kernel.org>2022-12-04 01:59:15 +0100
commit650ec51561fd201bcf47ce9b1d9b6fedd4bb60a6 (patch)
tree6ecbba36daeb21d8ede719688995c7205e17f8ba /rust
parent7c5977464681c2ec603efcac32a9432bcd355f12 (diff)
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rust: str: add `b_str!` macro
Add the `b_str!` macro, which creates a new `BStr` from a string literal. It is usable in const contexts, for instance: const X: &BStr = b_str!("Example"); Signed-off-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'rust')
-rw-r--r--rust/kernel/str.rs21
1 files changed, 21 insertions, 0 deletions
diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index 3aa1a0cb9bf8..95eb757c619d 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -9,6 +9,27 @@ use core::fmt;
/// `BStr` is simply an alias to `[u8]`, but has a more evident semantical meaning.
pub type BStr = [u8];
+/// Creates a new [`BStr`] from a string literal.
+///
+/// `b_str!` converts the supplied string literal to byte string, so non-ASCII
+/// characters can be included.
+///
+/// # Examples
+///
+/// ```
+/// # use kernel::b_str;
+/// # use kernel::str::BStr;
+/// const MY_BSTR: &BStr = b_str!("My awesome BStr!");
+/// ```
+#[macro_export]
+macro_rules! b_str {
+ ($str:literal) => {{
+ const S: &'static str = $str;
+ const C: &'static $crate::str::BStr = S.as_bytes();
+ C
+ }};
+}
+
/// Allows formatting of [`fmt::Arguments`] into a raw buffer.
///
/// It does not fail if callers write past the end of the buffer so that they can calculate the