rust/src/test/run-pass/foreign-fn-linkname.rs

// 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.

// ignore-fast doesn't like extern crate

extern crate libc;
use std::ffi::CString;

mod mlibc {
    use libc::{c_char, size_t};

    extern {
        #[link_name = "strlen"]
        pub fn my_strlen(str: *const c_char) -> size_t;
    }
}

fn strlen(str: String) -> uint {
    // C string is terminated with a zero
    let s = CString::from_slice(str.as_bytes()).unwrap();
    unsafe {
        mlibc::my_strlen(s.as_ptr()) as uint
    }
}

pub fn main() {
    let len = strlen("Rust".to_string());
    assert_eq!(len, 4_usize);
}