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1 | // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
2 | // file at the top-level directory of this distribution and at | |
3 | // http://rust-lang.org/COPYRIGHT. | |
4 | // | |
5 | // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or | |
6 | // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license | |
7 | // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your | |
8 | // option. This file may not be copied, modified, or distributed | |
9 | // except according to those terms. | |
10 | ||
c34b1796 AL |
11 | #![feature(libc)] |
12 | ||
1a4d82fc | 13 | extern crate libc; |
970d7e83 | 14 | |
223e47cc | 15 | mod rustrt { |
1a4d82fc | 16 | extern crate libc; |
970d7e83 | 17 | |
476ff2be | 18 | #[link(name = "rust_test_helpers", kind = "static")] |
1a4d82fc JJ |
19 | extern { |
20 | pub fn rust_dbg_call(cb: extern "C" fn(libc::uintptr_t) -> libc::uintptr_t, | |
21 | data: libc::uintptr_t) | |
970d7e83 | 22 | -> libc::uintptr_t; |
223e47cc LB |
23 | } |
24 | } | |
25 | ||
26 | extern fn cb(data: libc::uintptr_t) -> libc::uintptr_t { | |
1a4d82fc | 27 | if data == 1 { |
223e47cc LB |
28 | data |
29 | } else { | |
1a4d82fc | 30 | fact(data - 1) * data |
223e47cc LB |
31 | } |
32 | } | |
33 | ||
1a4d82fc | 34 | fn fact(n: libc::uintptr_t) -> libc::uintptr_t { |
223e47cc | 35 | unsafe { |
1a4d82fc | 36 | println!("n = {}", n); |
223e47cc LB |
37 | rustrt::rust_dbg_call(cb, n) |
38 | } | |
39 | } | |
40 | ||
41 | pub fn main() { | |
1a4d82fc JJ |
42 | let result = fact(10); |
43 | println!("result = {}", result); | |
44 | assert_eq!(result, 3628800); | |
223e47cc | 45 | } |