39 lines
964 B
Rust
39 lines
964 B
Rust
// 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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#![feature(std_misc, libc)]
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extern crate libc;
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use std::ffi::CString;
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mod mlibc {
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use libc::{c_char, size_t};
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extern {
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#[link_name = "strlen"]
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pub fn my_strlen(str: *const c_char) -> size_t;
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}
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}
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fn strlen(str: String) -> usize {
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// C string is terminated with a zero
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let s = CString::new(str).unwrap();
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unsafe {
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mlibc::my_strlen(s.as_ptr()) as usize
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}
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}
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pub fn main() {
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let len = strlen("Rust".to_string());
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assert_eq!(len, 4);
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}
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