42 lines
1.1 KiB
Rust
42 lines
1.1 KiB
Rust
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![crate_name="externcallback"]
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#![crate_type = "lib"]
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#![feature(libc)]
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extern crate libc;
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pub mod rustrt {
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extern crate libc;
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#[link(name = "rust_test_helpers")]
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extern {
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pub fn rust_dbg_call(cb: extern "C" fn(libc::uintptr_t) -> libc::uintptr_t,
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data: libc::uintptr_t)
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-> libc::uintptr_t;
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}
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}
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pub fn fact(n: libc::uintptr_t) -> libc::uintptr_t {
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unsafe {
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println!("n = {}", n);
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rustrt::rust_dbg_call(cb, n)
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}
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}
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pub extern fn cb(data: libc::uintptr_t) -> libc::uintptr_t {
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if data == 1 {
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data
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} else {
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fact(data - 1) * data
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}
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}
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