1 files changed, 54 insertions, 0 deletions
diff --git a/third_party/rust/pulse/src/error.rs b/third_party/rust/pulse/src/error.rs
new file mode 100644
index 0000000000..2e6f7074f2
--- /dev/null
+++ b/third_party/rust/pulse/src/error.rs
@@ -0,0 +1,54 @@
+// Copyright © 2017 Mozilla Foundation
+//
+// This program is made available under an ISC-style license.  See the
+// accompanying file LICENSE for details.
+
+use ffi;
+use std::ffi::CStr;
+
+#[macro_export]
+macro_rules! error_result {
+    ($t:expr, $err:expr) => {
+        if $err >= 0 {
+            Ok($t)
+        } else {
+            Err(ErrorCode::from_error_result($err))
+        }
+    };
+}
+
+#[derive(Debug, PartialEq)]
+pub struct ErrorCode {
+    err: ffi::pa_error_code_t,
+}
+
+impl ErrorCode {
+    pub fn from_error_result(err: i32) -> Self {
+        debug_assert!(err < 0);
+        ErrorCode {
+            err: (-err) as ffi::pa_error_code_t,
+        }
+    }
+
+    pub fn from_error_code(err: ffi::pa_error_code_t) -> Self {
+        debug_assert!(err > 0);
+        ErrorCode { err: err }
+    }
+
+    fn desc(&self) -> &'static str {
+        let cstr = unsafe { CStr::from_ptr(ffi::pa_strerror(self.err)) };
+        cstr.to_str().unwrap()
+    }
+}
+
+impl ::std::error::Error for ErrorCode {
+    fn description(&self) -> &str {
+        self.desc()
+    }
+}
+
+impl ::std::fmt::Display for ErrorCode {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        write!(f, "{:?}: {}", self, self.desc())
+    }
+}