| 1 | use crate::ffi::OsStr; |
| 2 | use crate::path::{Path, PathBuf, Prefix}; |
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| 3 | use crate::{env, io}; |
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| 4 | |
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| 5 | #[inline ] |
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| 6 | pub fn is_sep_byte(b: u8) -> bool { |
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| 7 | b == b'/' |
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| 8 | } |
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| 9 | |
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| 10 | #[inline ] |
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| 11 | pub fn is_verbatim_sep(b: u8) -> bool { |
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| 12 | b == b'/' |
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| 13 | } |
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| 14 | |
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| 15 | #[inline ] |
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| 16 | pub fn parse_prefix(_: &OsStr) -> Option<Prefix<'_>> { |
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| 17 | None |
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| 18 | } |
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| 19 | |
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| 20 | pub const MAIN_SEP_STR: &str = "/" ; |
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| 21 | pub const MAIN_SEP: char = '/' ; |
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| 22 | |
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| 23 | /// Make a POSIX path absolute without changing its semantics. |
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| 24 | pub(crate) fn absolute(path: &Path) -> io::Result<PathBuf> { |
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| 25 | // This is mostly a wrapper around collecting `Path::components`, with |
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| 26 | // exceptions made where this conflicts with the POSIX specification. |
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| 27 | // See 4.13 Pathname Resolution, IEEE Std 1003.1-2017 |
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| 28 | // https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap04.html#tag_04_13 |
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| 29 | |
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| 30 | // Get the components, skipping the redundant leading "." component if it exists. |
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| 31 | let mut components = path.strip_prefix("." ).unwrap_or(path).components(); |
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| 32 | let path_os = path.as_os_str().as_encoded_bytes(); |
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| 33 | |
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| 34 | let mut normalized = if path.is_absolute() { |
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| 35 | // "If a pathname begins with two successive <slash> characters, the |
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| 36 | // first component following the leading <slash> characters may be |
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| 37 | // interpreted in an implementation-defined manner, although more than |
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| 38 | // two leading <slash> characters shall be treated as a single <slash> |
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| 39 | // character." |
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| 40 | if path_os.starts_with(b"//" ) && !path_os.starts_with(b"///" ) { |
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| 41 | components.next(); |
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| 42 | PathBuf::from("//" ) |
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| 43 | } else { |
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| 44 | PathBuf::new() |
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| 45 | } |
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| 46 | } else { |
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| 47 | env::current_dir()? |
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| 48 | }; |
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| 49 | normalized.extend(components); |
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| 50 | |
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| 51 | // "Interfaces using pathname resolution may specify additional constraints |
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| 52 | // when a pathname that does not name an existing directory contains at |
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| 53 | // least one non- <slash> character and contains one or more trailing |
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| 54 | // <slash> characters". |
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| 55 | // A trailing <slash> is also meaningful if "a symbolic link is |
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| 56 | // encountered during pathname resolution". |
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| 57 | if path_os.ends_with(b"/" ) { |
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| 58 | normalized.push("" ); |
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| 59 | } |
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| 60 | |
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| 61 | Ok(normalized) |
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| 62 | } |
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| 63 | |
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| 64 | pub(crate) fn is_absolute(path: &Path) -> bool { |
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| 65 | if cfg!(any(unix, target_os = "hermit" , target_os = "wasi" )) { |
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| 66 | path.has_root() |
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| 67 | } else { |
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| 68 | path.has_root() && path.prefix().is_some() |
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| 69 | } |
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| 70 | } |
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| 71 | |
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