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windows: document that we rely on an undocumented property of GetUserProfileDirectoryW #141244

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May 19, 2025
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windows: document that we rely on an undocumented property of GetUserProfileDirectoryW #141244

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2 changes: 2 additions & 0 deletions library/std/src/sys/pal/windows/os.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -202,6 +202,8 @@ fn home_dir_crt() -> Option<PathBuf> {
|buf, mut sz| {
// GetUserProfileDirectoryW does not quite use the usual protocol for
// negotiating the buffer size, so we have to translate.
// FIXME(#141254): We rely on the *undocumented* property that this function will
// always set the size, not just on failure.
match c::GetUserProfileDirectoryW(
ptr::without_provenance_mut(CURRENT_PROCESS_TOKEN),
buf,
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