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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 | 11 | |
c34b1796 AL |
12 | |
13 | #![feature(std_misc, libc)] | |
970d7e83 | 14 | |
1a4d82fc JJ |
15 | extern crate libc; |
16 | use std::ffi::CString; | |
223e47cc | 17 | |
1a4d82fc JJ |
18 | mod mlibc { |
19 | use libc::{c_char, size_t}; | |
20 | ||
21 | extern { | |
223e47cc | 22 | #[link_name = "strlen"] |
1a4d82fc | 23 | pub fn my_strlen(str: *const c_char) -> size_t; |
223e47cc LB |
24 | } |
25 | } | |
26 | ||
c34b1796 | 27 | fn strlen(str: String) -> usize { |
1a4d82fc | 28 | // C string is terminated with a zero |
85aaf69f | 29 | let s = CString::new(str).unwrap(); |
223e47cc | 30 | unsafe { |
c34b1796 | 31 | mlibc::my_strlen(s.as_ptr()) as usize |
223e47cc LB |
32 | } |
33 | } | |
34 | ||
35 | pub fn main() { | |
1a4d82fc | 36 | let len = strlen("Rust".to_string()); |
c34b1796 | 37 | assert_eq!(len, 4); |
223e47cc | 38 | } |