fdf24317ac
It is isolated and complex enough that it deserves attention all on its own. It's also eminently reusable.
39 lines
1.1 KiB
Rust
39 lines
1.1 KiB
Rust
use std::ffi::OsStr;
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use std::path::Path;
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/// The final component of the path, if it is a normal file.
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///
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/// If the path terminates in ., .., or consists solely of a root of prefix,
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/// file_name will return None.
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#[cfg(unix)]
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pub fn file_name<'a, P: AsRef<Path> + ?Sized>(
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path: &'a P,
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) -> Option<&'a OsStr> {
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use std::os::unix::ffi::OsStrExt;
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use memchr::memrchr;
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let path = path.as_ref().as_os_str().as_bytes();
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if path.is_empty() {
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return None;
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} else if path.len() == 1 && path[0] == b'.' {
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return None;
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} else if path.last() == Some(&b'.') {
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return None;
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} else if path.len() >= 2 && &path[path.len() - 2..] == &b".."[..] {
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return None;
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}
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let last_slash = memrchr(b'/', path).map(|i| i + 1).unwrap_or(0);
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Some(OsStr::from_bytes(&path[last_slash..]))
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}
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/// The final component of the path, if it is a normal file.
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///
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/// If the path terminates in ., .., or consists solely of a root of prefix,
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/// file_name will return None.
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#[cfg(not(unix))]
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pub fn file_name<'a, P: AsRef<Path> + ?Sized>(
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path: &'a P,
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) -> Option<&'a OsStr> {
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path.as_ref().file_name()
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}
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