1 files changed, 70 insertions, 0 deletions
diff --git a/vendor/errno/src/windows.rs b/vendor/errno/src/windows.rs
new file mode 100644
index 000000000..94e736210
--- /dev/null
+++ b/vendor/errno/src/windows.rs
@@ -0,0 +1,70 @@
+//! Implementation of `errno` functionality for Windows.
+//!
+//! Adapted from `src/libstd/sys/windows/os.rs` in the Rust distribution.
+
+// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[cfg(feature = "std")]
+use std::ptr;
+use winapi::shared::minwindef::DWORD;
+#[cfg(feature = "std")]
+use winapi::shared::ntdef::WCHAR;
+#[cfg(feature = "std")]
+use winapi::um::winbase::{FORMAT_MESSAGE_FROM_SYSTEM, FORMAT_MESSAGE_IGNORE_INSERTS};
+
+use Errno;
+
+#[cfg(feature = "std")]
+pub fn with_description<F, T>(err: Errno, callback: F) -> T where
+    F: FnOnce(Result<&str, Errno>) -> T
+{
+    // This value is calculated from the macro
+    // MAKELANGID(LANG_SYSTEM_DEFAULT, SUBLANG_SYS_DEFAULT)
+    let lang_id = 0x0800 as DWORD;
+
+    let mut buf = [0 as WCHAR; 2048];
+
+    unsafe {
+        let res = ::winapi::um::winbase::FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM |
+                                           FORMAT_MESSAGE_IGNORE_INSERTS,
+                                           ptr::null_mut(),
+                                           err.0 as DWORD,
+                                           lang_id,
+                                           buf.as_mut_ptr(),
+                                           buf.len() as DWORD,
+                                           ptr::null_mut());
+        if res == 0 {
+            // Sometimes FormatMessageW can fail e.g. system doesn't like lang_id
+            let fm_err = errno();
+            return callback(Err(fm_err));
+        }
+
+        let msg = String::from_utf16_lossy(&buf[..res as usize]);
+        // Trim trailing CRLF inserted by FormatMessageW
+        #[allow(deprecated)] // TODO: remove when MSRV >= 1.30
+        callback(Ok(msg.trim_right()))
+    }
+}
+
+#[cfg(feature = "std")]
+pub const STRERROR_NAME: &'static str = "FormatMessageW";
+
+pub fn errno() -> Errno {
+    unsafe {
+        Errno(::winapi::um::errhandlingapi::GetLastError() as i32)
+    }
+}
+
+pub fn set_errno(Errno(errno): Errno) {
+    unsafe {
+        ::winapi::um::errhandlingapi::SetLastError(errno as DWORD)
+    }
+}