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Make PathBuf less Ok with adding UTF-16 then into_string #126305

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Jun 12, 2024
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Make PathBuf less Ok with adding UTF-16 then into_string #126305

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3 changes: 3 additions & 0 deletions library/std/src/sys_common/wtf8.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -477,6 +477,9 @@ impl Wtf8Buf {
/// Part of a hack to make PathBuf::push/pop more efficient.
#[inline]
pub(crate) fn as_mut_vec_for_path_buf(&mut self) -> &mut Vec<u8> {
// FIXME: this function should not even exist, as it implies violating Wtf8Buf invariants
// For now, simply assume that is about to happen.
self.is_known_utf8 = false;
&mut self.bytes
}
}
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14 changes: 14 additions & 0 deletions library/std/tests/windows.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
#![cfg(windows)]
//! An external tests

use std::{ffi::OsString, os::windows::ffi::OsStringExt, path::PathBuf};

#[test]
#[should_panic]
fn os_string_must_know_it_isnt_utf8_issue_126291() {
let mut utf8 = PathBuf::from(OsString::from("utf8".to_owned()));
let non_utf8: OsString =
OsStringExt::from_wide(&[0x6e, 0x6f, 0x6e, 0xd800, 0x75, 0x74, 0x66, 0x38]);
utf8.set_extension(&non_utf8);
utf8.into_os_string().into_string().unwrap();
}
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