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Rollup merge of #126305 - workingjubilee:fix-os-string-to-string-utf8-invariant, r=joboet

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Make PathBuf less Ok with adding UTF-16 then `into_string`

Fixes #126291 which is, as far as I can tell, a regression introduced by #96869.

try-job: x86_64-msvc
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Jubilee 2024-06-12 03:57:25 -07:00 committed by GitHub
commit 3862f01655
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2 changed files with 17 additions and 0 deletions
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3
library/std/src/sys_common/wtf8.rs
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@ -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
}
}

14
library/std/tests/windows.rs Normal file
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@ -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();
}