X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=src%2Flibstd%2Fffi%2Fc_str.rs;h=5dae1a09bf410f7330a3786c8270b32fbc1b90ff;hb=3c5a0fa45b5e2786b6e64e27f48cd129e7aefdbd;hp=77b90c0846bbe44f2349b7a674223d6f47ea59f9;hpb=68d9284a9b7570ec32178e544f6f8ca7ac0be0f9;p=rust.git

diff --git a/src/libstd/ffi/c_str.rs b/src/libstd/ffi/c_str.rs
index 77b90c0846b..5dae1a09bf4 100644
--- a/src/libstd/ffi/c_str.rs
+++ b/src/libstd/ffi/c_str.rs
@@ -211,8 +211,20 @@ fn _new(bytes: Vec<u8>) -> Result<CString, NulError> {
     /// This method is equivalent to `new` except that no runtime assertion
     /// is made that `v` contains no 0 bytes, and it requires an actual
     /// byte vector, not anything that can be converted to one with Into.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::ffi::CString;
+    ///
+    /// let raw = b"foo".to_vec();
+    /// unsafe {
+    ///     let c_string = CString::from_vec_unchecked(raw);
+    /// }
+    /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     pub unsafe fn from_vec_unchecked(mut v: Vec<u8>) -> CString {
+        v.reserve_exact(1);
         v.push(0);
         CString { inner: v.into_boxed_slice() }
     }