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strengthen doc warning about CString::from_raw #36018

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Sep 24, 2016
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strengthen doc warning about CString::from_raw #36018

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9 changes: 7 additions & 2 deletions src/libstd/ffi/c_str.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -228,9 +228,14 @@ impl CString {

/// Retakes ownership of a `CString` that was transferred to C.
///
/// Additionally, the length of the string will be recalculated from the pointer.
///
/// # Safety
///
/// This should only ever be called with a pointer that was earlier
/// obtained by calling `into_raw` on a `CString`. Additionally, the length
/// of the string will be recalculated from the pointer.
/// obtained by calling `into_raw` on a `CString`. Other usage (e.g. trying to take
/// ownership of a string that was allocated by foreign code) is likely to lead
/// to undefined behavior or allocator corruption.
#[stable(feature = "cstr_memory", since = "1.4.0")]
pub unsafe fn from_raw(ptr: *mut c_char) -> CString {
let len = libc::strlen(ptr) + 1; // Including the NUL byte
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