From 7c0f5e3598c2489d53259253842c7a74ece773cc Mon Sep 17 00:00:00 2001
From: Philipp Keller <philipp.keller@gmail.com>
Date: Wed, 28 Sep 2016 07:02:15 +0200
Subject: Add debug_assert ensuring popped byte is nul

---
 src/unistd.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/unistd.rs')

diff --git a/src/unistd.rs b/src/unistd.rs
index 4d4e7529..4226b2f7 100644
--- a/src/unistd.rs
+++ b/src/unistd.rs
@@ -538,7 +538,8 @@ pub fn mkstemp<P: ?Sized + NixPath>(template: &P) -> Result<(RawFd, PathBuf)> {
     let mut path = try!(template.with_nix_path(|path| {path.to_bytes_with_nul().to_owned()}));
     let p = path.as_mut_ptr() as *mut _;
     let fd = unsafe { libc::mkstemp(p) };
-    path.pop(); // drop the trailing nul
+    let last = path.pop(); // drop the trailing nul
+    debug_assert!(last == Some(b'\0'));
     let pathname = OsString::from_vec(path);
     try!(Errno::result(fd));
     Ok((fd, PathBuf::from(pathname)))
-- 
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