| 1 | use crate::env; |
| 2 | use crate::ffi::OsStr; |
|---|
| 3 | use crate::io; |
|---|
| 4 | use crate::path::{Path, PathBuf, Prefix}; |
|---|
| 5 | |
|---|
| 6 | #[inline ] |
|---|
| 7 | pub fn is_sep_byte(b: u8) -> bool { |
|---|
| 8 | b == b'/' |
|---|
| 9 | } |
|---|
| 10 | |
|---|
| 11 | #[inline ] |
|---|
| 12 | pub fn is_verbatim_sep(b: u8) -> bool { |
|---|
| 13 | b == b'/' |
|---|
| 14 | } |
|---|
| 15 | |
|---|
| 16 | #[inline ] |
|---|
| 17 | pub fn parse_prefix(_: &OsStr) -> Option<Prefix<'_>> { |
|---|
| 18 | None |
|---|
| 19 | } |
|---|
| 20 | |
|---|
| 21 | pub const MAIN_SEP_STR: &str = "/" ; |
|---|
| 22 | pub const MAIN_SEP: char = '/' ; |
|---|
| 23 | |
|---|
| 24 | /// Make a POSIX path absolute without changing its semantics. |
|---|
| 25 | pub(crate) fn absolute(path: &Path) -> io::Result<PathBuf> { |
|---|
| 26 | // This is mostly a wrapper around collecting `Path::components`, with |
|---|
| 27 | // exceptions made where this conflicts with the POSIX specification. |
|---|
| 28 | // See 4.13 Pathname Resolution, IEEE Std 1003.1-2017 |
|---|
| 29 | // https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13 |
|---|
| 30 | |
|---|
| 31 | // Get the components, skipping the redundant leading "." component if it exists. |
|---|
| 32 | let mut components = path.strip_prefix("." ).unwrap_or(path).components(); |
|---|
| 33 | let path_os = path.as_os_str().as_encoded_bytes(); |
|---|
| 34 | |
|---|
| 35 | let mut normalized = if path.is_absolute() { |
|---|
| 36 | // "If a pathname begins with two successive <slash> characters, the |
|---|
| 37 | // first component following the leading <slash> characters may be |
|---|
| 38 | // interpreted in an implementation-defined manner, although more than |
|---|
| 39 | // two leading <slash> characters shall be treated as a single <slash> |
|---|
| 40 | // character." |
|---|
| 41 | if path_os.starts_with(b"//" ) && !path_os.starts_with(b"///" ) { |
|---|
| 42 | components.next(); |
|---|
| 43 | PathBuf::from("//" ) |
|---|
| 44 | } else { |
|---|
| 45 | PathBuf::new() |
|---|
| 46 | } |
|---|
| 47 | } else { |
|---|
| 48 | env::current_dir()? |
|---|
| 49 | }; |
|---|
| 50 | normalized.extend(components); |
|---|
| 51 | |
|---|
| 52 | // "Interfaces using pathname resolution may specify additional constraints |
|---|
| 53 | // when a pathname that does not name an existing directory contains at |
|---|
| 54 | // least one non- <slash> character and contains one or more trailing |
|---|
| 55 | // <slash> characters". |
|---|
| 56 | // A trailing <slash> is also meaningful if "a symbolic link is |
|---|
| 57 | // encountered during pathname resolution". |
|---|
| 58 | if path_os.ends_with(b"/" ) { |
|---|
| 59 | normalized.push("" ); |
|---|
| 60 | } |
|---|
| 61 | |
|---|
| 62 | Ok(normalized) |
|---|
| 63 | } |
|---|
| 64 | |
|---|
