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implement OsString::truncate #133264

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implement OsString::truncate #133264

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12 changes: 8 additions & 4 deletions library/std/src/ffi/os_str.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -550,11 +550,15 @@ impl OsString {
OsStr::from_inner_mut(self.inner.leak())
}

/// Provides plumbing to core `Vec::truncate`.
/// More well behaving alternative to allowing outer types
/// full mutable access to the core `Vec`.
/// Truncate the the `OsString` to the specified length.
///
/// # Panics
/// Panics if `len` does not lie on a valid `OsStr` boundary
/// (as described in [`OsStr::slice_encoded_bytes`]).
#[inline]
pub(crate) fn truncate(&mut self, len: usize) {
#[unstable(feature = "os_string_truncate", issue = "133262")]
pub fn truncate(&mut self, len: usize) {
self.as_os_str().inner.check_public_boundary(len);
self.inner.truncate(len);
}

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