| // 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. |
| |
| // run-pass |
| // ignore-wasm32-bare no libc to test ffi with |
| |
| #![feature(rustc_private)] |
| |
| 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) -> usize { |
| // C string is terminated with a zero |
| let s = CString::new(str).unwrap(); |
| unsafe { |
| mlibc::my_strlen(s.as_ptr()) as usize |
| } |
| } |
| |
| pub fn main() { |
| let len = strlen("Rust".to_string()); |
| assert_eq!(len, 4); |
| } |
