38 lines
988 B
Rust
38 lines
988 B
Rust
// Copyright 2012 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.
|
|
|
|
mod rustrt {
|
|
pub extern {
|
|
pub fn rust_dbg_call(cb: *u8, data: libc::uintptr_t)
|
|
-> libc::uintptr_t;
|
|
}
|
|
}
|
|
|
|
extern fn cb(data: libc::uintptr_t) -> libc::uintptr_t {
|
|
if data == 1u {
|
|
data
|
|
} else {
|
|
fact(data - 1u) * data
|
|
}
|
|
}
|
|
|
|
fn fact(n: uint) -> uint {
|
|
unsafe {
|
|
debug!("n = %?", n);
|
|
rustrt::rust_dbg_call(cb, n)
|
|
}
|
|
}
|
|
|
|
pub fn main() {
|
|
let result = fact(10u);
|
|
debug!("result = %?", result);
|
|
assert!(result == 3628800u);
|
|
}
|