1 files changed, 33 insertions, 0 deletions
diff --git a/third_party/rust/libudev/src/util.rs b/third_party/rust/libudev/src/util.rs
new file mode 100644
index 0000000000..6831d2e14a
--- /dev/null
+++ b/third_party/rust/libudev/src/util.rs
@@ -0,0 +1,33 @@
+use std::slice;
+use std::ffi::{CString,OsStr};
+
+use ::libc::{c_int,c_char};
+
+use std::os::unix::prelude::*;
+
+pub fn ptr_to_os_str<'a>(ptr: *const c_char) -> Option<&'a OsStr> {
+    if !ptr.is_null() {
+        Some(unsafe { ptr_to_os_str_unchecked(ptr) })
+    }
+    else {
+        None
+    }
+}
+
+pub unsafe fn ptr_to_os_str_unchecked<'a>(ptr: *const c_char) -> &'a OsStr {
+    OsStr::from_bytes(slice::from_raw_parts(ptr as *const u8, ::libc::strlen(ptr) as usize))
+}
+
+pub fn os_str_to_cstring<T: AsRef<OsStr>>(s: T) -> ::Result<CString> {
+    match CString::new(s.as_ref().as_bytes()) {
+        Ok(s) => Ok(s),
+        Err(_) => return Err(::error::from_errno(::libc::EINVAL))
+    }
+}
+
+pub fn errno_to_result(errno: c_int) -> ::Result<()> {
+    match errno {
+        0 => Ok(()),
+        e => Err(::error::from_errno(e))
+    }
+}