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use std::ffi::{OsStr, CStr, CString};
use std::path::{Path, PathBuf};
use std::os::unix::ffi::OsStrExt;
use crate::{Entry};
/// The purpose of this is similar to `AsRef<Path>` but it's optimized for
/// things that can be directly used as `CStr` (which is type passed to
/// the underlying system call).
///
/// This trait should be implemented for everything for which `AsRef<Path>`
/// is implemented
pub trait AsPath {
/// The return value of the `to_path` that holds data copied from the
/// original path (if copy is needed, otherwise it's just a reference)
type Buffer: AsRef<CStr>;
/// Returns `None` when path contains a zero byte
fn to_path(self) -> Option<Self::Buffer>;
}
impl<'a> AsPath for &'a Path {
type Buffer = CString;
fn to_path(self) -> Option<CString> {
CString::new(self.as_os_str().as_bytes()).ok()
}
}
impl<'a> AsPath for &'a PathBuf {
type Buffer = CString;
fn to_path(self) -> Option<CString> {
CString::new(self.as_os_str().as_bytes()).ok()
}
}
impl<'a> AsPath for &'a OsStr {
type Buffer = CString;
fn to_path(self) -> Option<CString> {
CString::new(self.as_bytes()).ok()
}
}
impl<'a> AsPath for &'a str {
type Buffer = CString;
fn to_path(self) -> Option<CString> {
CString::new(self.as_bytes()).ok()
}
}
impl<'a> AsPath for &'a String {
type Buffer = CString;
fn to_path(self) -> Option<CString> {
CString::new(self.as_bytes()).ok()
}
}
impl<'a> AsPath for String {
type Buffer = CString;
fn to_path(self) -> Option<CString> {
CString::new(self).ok()
}
}
impl<'a> AsPath for &'a CStr {
type Buffer = &'a CStr;
fn to_path(self) -> Option<&'a CStr> {
Some(self)
}
}
impl<'a> AsPath for &'a Entry {
type Buffer = &'a CStr;
fn to_path(self) -> Option<&'a CStr> {
Some(&self.name)
}
}
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