str: add a function for truncating a vector of u16 at NUL.

Many of the functions interacting with Windows APIs allocate a vector of
0's and do not retrieve a length directly from the API call, and so need
to be sure to remove the unmodified junk at the end of the vector.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/libnative/io/file.rs b/src/libnative/io/file.rs
index 80f5f74c53a..6d3a156a2b0 100644
--- a/src/libnative/io/file.rs
+++ b/src/libnative/io/file.rs
@@ -571,7 +571,8 @@ pub fn readdir(p: &CString) -> IoResult<~[Path]> {
                         else {
                             let fp_vec = vec::from_buf(
                                 fp_buf, wcslen(fp_buf) as uint);
-                            let fp_str = str::from_utf16(fp_vec)
+                            let fp_trimmed = str::truncate_utf16_at_nul(fp_vec);
+                            let fp_str = str::from_utf16(fp_trimmed)
                                     .expect("rust_list_dir_wfd_fp_buf returned invalid UTF-16");
                             paths.push(Path::new(fp_str));
                         }