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add stronger warning to CString::from_raw

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Alex Burka 2016-08-26 13:17:45 -04:00 • committed by Alex Burka
parent 739d57180f
commit 0d3d23bdee
1 changed files with 7 additions and 2 deletions
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9
src/libstd/ffi/c_str.rs
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@ -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