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// Copyright 2014 Christopher Schröder, Johannes Köster.
// Licensed under the MIT license (http://opensource.org/licenses/MIT)
// This file may not be copied, modified, or distributed
// except according to those terms.

//! Module with utility code.

use std::ffi;
use std::path::Path;
use std::ptr;

/// Copies data from `src` to `dst`
/// TODO remove once stable in standard library.
///
/// Panics if the length of `dst` is less than the length of `src`.
#[inline]
pub fn copy_memory(src: &[u8], dst: &mut [u8]) {
    let len_src = src.len();
    assert!(
        dst.len() >= len_src,
        format!("dst len {} < src len {}", dst.len(), src.len())
    );
    // `dst` is unaliasable, so we know statically it doesn't overlap
    // with `src`.
    unsafe {
        ptr::copy_nonoverlapping(src.as_ptr(), dst.as_mut_ptr(), len_src);
    }
}

pub fn path_to_cstring<P: AsRef<Path>>(path: &P) -> Option<ffi::CString> {
    path.as_ref()
        .to_str()
        .and_then(|p| ffi::CString::new(p).ok())
}