1 files changed, 75 insertions, 0 deletions
diff --git a/third_party/rust/authenticator/src/util.rs b/third_party/rust/authenticator/src/util.rs
new file mode 100644
index 0000000000..b73f9de38b
--- /dev/null
+++ b/third_party/rust/authenticator/src/util.rs
@@ -0,0 +1,75 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+extern crate libc;
+
+use std::io;
+
+macro_rules! try_or {
+    ($val:expr, $or:expr) => {
+        match $val {
+            Ok(v) => v,
+            Err(e) => {
+                return $or(e);
+            }
+        }
+    };
+}
+
+pub trait Signed {
+    fn is_negative(&self) -> bool;
+}
+
+impl Signed for i32 {
+    fn is_negative(&self) -> bool {
+        *self < 0
+    }
+}
+
+impl Signed for usize {
+    fn is_negative(&self) -> bool {
+        (*self as isize) < 0
+    }
+}
+
+#[cfg(all(target_os = "linux", not(test)))]
+pub fn from_unix_result<T: Signed>(rv: T) -> io::Result<T> {
+    if rv.is_negative() {
+        let errno = unsafe { *libc::__errno_location() };
+        Err(io::Error::from_raw_os_error(errno))
+    } else {
+        Ok(rv)
+    }
+}
+
+#[cfg(all(target_os = "freebsd", not(test)))]
+pub fn from_unix_result<T: Signed>(rv: T) -> io::Result<T> {
+    if rv.is_negative() {
+        let errno = unsafe { *libc::__error() };
+        Err(io::Error::from_raw_os_error(errno))
+    } else {
+        Ok(rv)
+    }
+}
+
+#[cfg(all(target_os = "openbsd", not(test)))]
+pub fn from_unix_result<T: Signed>(rv: T) -> io::Result<T> {
+    if rv.is_negative() {
+        Err(io::Error::last_os_error())
+    } else {
+        Ok(rv)
+    }
+}
+
+pub fn io_err(msg: &str) -> io::Error {
+    io::Error::new(io::ErrorKind::Other, msg)
+}
+
+#[cfg(all(test, not(feature = "crypto_dummy")))]
+pub fn decode_hex(s: &str) -> Vec<u8> {
+    (0..s.len())
+        .step_by(2)
+        .map(|i| u8::from_str_radix(&s[i..i + 2], 16).unwrap())
+        .collect()
+}