1 files changed, 65 insertions, 0 deletions
diff --git a/vendor/errno/src/wasi.rs b/vendor/errno/src/wasi.rs
new file mode 100644
index 000000000..28e3d9f11
--- /dev/null
+++ b/vendor/errno/src/wasi.rs
@@ -0,0 +1,65 @@
+//! Implementation of `errno` functionality for WASI.
+//!
+//! Adapted from `unix.rs`.
+
+// Copyright 2015 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::ffi::CStr;
+use libc::c_int;
+#[cfg(feature = "std")]
+use libc::{self, c_char};
+
+use Errno;
+
+#[cfg(feature = "std")]
+pub fn with_description<F, T>(err: Errno, callback: F) -> T where
+    F: FnOnce(Result<&str, Errno>) -> T
+{
+    let mut buf = [0 as c_char; 1024];
+    unsafe {
+        if strerror_r(err.0, buf.as_mut_ptr(), buf.len() as libc::size_t) < 0 {
+            let fm_err = errno();
+            if fm_err != Errno(libc::ERANGE) {
+                return callback(Err(fm_err));
+            }
+        }
+    }
+    let c_str = unsafe { CStr::from_ptr(buf.as_ptr()) };
+    callback(Ok(&String::from_utf8_lossy(c_str.to_bytes())))
+}
+
+#[cfg(feature = "std")]
+pub const STRERROR_NAME: &'static str = "strerror_r";
+
+pub fn errno() -> Errno {
+    // libc_errno is thread-local, so simply read its value.
+    unsafe {
+        Errno(libc_errno)
+    }
+}
+
+pub fn set_errno(Errno(new_errno): Errno) {
+    // libc_errno is thread-local, so simply assign to it.
+    unsafe {
+        libc_errno = new_errno;
+    }
+}
+
+extern {
+    #[thread_local]
+    #[link_name = "errno"]
+    static mut libc_errno: c_int;
+
+    #[cfg(feature = "std")]
+    fn strerror_r(errnum: c_int, buf: *mut c_char,
+                  buflen: libc::size_t) -> c_int;
+}