diff options
Diffstat (limited to 'src/libstd/ffi')
| -rw-r--r-- | src/libstd/ffi/c_str.rs | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/libstd/ffi/c_str.rs b/src/libstd/ffi/c_str.rs index 2d5e8c04194..d8785142795 100644 --- a/src/libstd/ffi/c_str.rs +++ b/src/libstd/ffi/c_str.rs @@ -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 |