/// assert_eq!(c_str.to_str().unwrap(), "AAAAAAAA");
/// ```
///
+ #[rustc_allow_const_fn_unstable(const_slice_index)]
#[stable(feature = "cstr_from_bytes_until_nul", since = "CURRENT_RUSTC_VERSION")]
- #[rustc_const_unstable(feature = "const_cstr_from_bytes_until_nul", issue = "95027")]
+ #[rustc_const_stable(feature = "cstr_from_bytes_until_nul", since = "CURRENT_RUSTC_VERSION")]
pub const fn from_bytes_until_nul(bytes: &[u8]) -> Result<&CStr, FromBytesUntilNulError> {
let nul_pos = memchr::memchr(0, bytes);
match nul_pos {
/// bytes where the borrow propagated all the way to the most significant
/// bit."
#[inline]
+#[rustc_const_stable(feature = "const_memchr", since = "1.65.0")]
const fn contains_zero_byte(x: usize) -> bool {
x.wrapping_sub(LO_USIZE) & !x & HI_USIZE != 0
}
-#[cfg(target_pointer_width = "16")]
#[inline]
+#[cfg(target_pointer_width = "16")]
+#[rustc_const_stable(feature = "const_memchr", since = "1.65.0")]
const fn repeat_byte(b: u8) -> usize {
(b as usize) << 8 | b as usize
}
-#[cfg(not(target_pointer_width = "16"))]
#[inline]
+#[cfg(not(target_pointer_width = "16"))]
+#[rustc_const_stable(feature = "const_memchr", since = "1.65.0")]
const fn repeat_byte(b: u8) -> usize {
(b as usize) * (usize::MAX / 255)
}
/// Returns the first index matching the byte `x` in `text`.
-#[must_use]
#[inline]
+#[must_use]
+#[rustc_const_stable(feature = "const_memchr", since = "1.65.0")]
pub const fn memchr(x: u8, text: &[u8]) -> Option<usize> {
// Fast path for small slices.
if text.len() < 2 * USIZE_BYTES {
}
#[inline]
+#[rustc_const_stable(feature = "const_memchr", since = "1.65.0")]
const fn memchr_naive(x: u8, text: &[u8]) -> Option<usize> {
let mut i = 0;
None
}
+#[rustc_allow_const_fn_unstable(const_cmp)]
+#[rustc_allow_const_fn_unstable(const_slice_index)]
+#[rustc_allow_const_fn_unstable(const_align_offset)]
+#[rustc_const_stable(feature = "const_memchr", since = "1.65.0")]
const fn memchr_aligned(x: u8, text: &[u8]) -> Option<usize> {
// Scan for a single byte value by reading two `usize` words at a time.
//