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use core::libc::c_int;
pub fn guard<T> (finally: ~fn (), body: &fn () -> T) -> T {
let _guard = Guard { finally: finally };
body()
}
struct Guard {
priv finally: ~fn (),
}
impl Drop for Guard {
fn finalize (&self) {
(self.finally)();
}
}
// XXX huge hack until there's a better built-in way to do this
pub fn timed_read (timeout: int) -> Option<char> {
let first = unsafe { io_helper::timed_read(timeout as c_int) };
if first < 0 {
return None;
}
let mut buf = ~[first as u8];
let nbytes = str::utf8_char_width(first as u8);
for uint::range(0, nbytes - 1) |_| {
let next = unsafe { io_helper::timed_read(-1 as c_int) };
if next < 0 {
return None;
}
buf.push(next as u8);
}
Some(unsafe { str::raw::from_bytes(buf) }.char_at(0))
}
extern mod io_helper {
fn timed_read (timeout: c_int) -> c_int;
}
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