strerror(3): created strerror() method

src/strerror.rs

@@ -9,19 +9,23 @@
 
 use std::ffi::{ c_int, c_char, CStr };
 
-/* binding to strerror(3p) */
-extern "C" { fn strerror(errnum: c_int) -> *mut c_char; }
+pub trait StrError { fn strerror(&self) -> String; }
 
-/* wrapper function for use in Rust */
-pub fn raw_message(err: std::io::Error) -> String {
+impl StrError for std::io::Error {
+	/* wrapper function for use in Rust */
+	fn strerror(&self) -> String {
 		/* Get the raw OS error. If it’s None, what the hell is going on‽ */
-	let errno = err.raw_os_error().unwrap_or(0) as c_int;
+		let errno = self.raw_os_error().unwrap_or(0) as c_int;
 
 		/* Get a CStr from the error message so that it’s referenced and then
-	 * convert it to an owned value. If the string is not valid UTF-8, return
-	 * that error instead. */
+		 * convert it to an owned value. If the string is not valid UTF-8,
+		 * return that error instead. */
 		match unsafe { CStr::from_ptr(strerror(errno)) }.to_str() {
 			Ok(s) => s.to_owned(), // yay!! :D
 			Err(e) => e.to_string(), // awww :(
 		}
+	}
 }
+
+/* binding to strerror(3p) */
+extern "C" { fn strerror(errnum: c_int) -> *mut c_char; }