src/test/run-pass/extern-call.rs


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// 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.

extern mod rustrt {
    #[legacy_exports];
    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 {
    debug!("n = %?", n);
    rustrt::rust_dbg_call(cb, n)
}

fn main() {
    let result = fact(10u);
    debug!("result = %?", result);
    assert result == 3628800u;
}