1 // Copyright 2018 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use std::path::{Path, PathBuf};
12 use std::ffi::CString;
16 // Unfortunately, on windows, it looks like msvcrt.dll is silently translating
17 // verbatim paths under the hood to non-verbatim paths! This manifests itself as
18 // gcc looking like it cannot accept paths of the form `\\?\C:\...`, but the
19 // real bug seems to lie in msvcrt.dll.
21 // Verbatim paths are generally pretty rare, but the implementation of
22 // `fs::canonicalize` currently generates paths of this form, meaning that we're
23 // going to be passing quite a few of these down to gcc, so we need to deal with
26 // For now we just strip the "verbatim prefix" of `\\?\` from the path. This
27 // will probably lose information in some cases, but there's not a whole lot
28 // more we can do with a buggy msvcrt...
30 // For some more information, see this comment:
31 // https://github.com/rust-lang/rust/issues/25505#issuecomment-102876737
33 pub fn fix_windows_verbatim_for_gcc(p: &Path) -> PathBuf {
35 use std::ffi::OsString;
36 let mut components = p.components();
37 let prefix = match components.next() {
38 Some(path::Component::Prefix(p)) => p,
39 _ => return p.to_path_buf(),
42 path::Prefix::VerbatimDisk(disk) => {
43 let mut base = OsString::from(format!("{}:", disk as char));
44 base.push(components.as_path());
47 path::Prefix::VerbatimUNC(server, share) => {
48 let mut base = OsString::from(r"\\");
52 base.push(components.as_path());
60 pub fn fix_windows_verbatim_for_gcc(p: &Path) -> PathBuf {
69 /// Copy `p` into `q`, preferring to use hard-linking if possible. If
70 /// `q` already exists, it is removed first.
71 /// The result indicates which of the two operations has been performed.
72 pub fn link_or_copy<P: AsRef<Path>, Q: AsRef<Path>>(p: P, q: Q) -> io::Result<LinkOrCopy> {
79 match fs::hard_link(p, q) {
80 Ok(()) => Ok(LinkOrCopy::Link),
82 match fs::copy(p, q) {
83 Ok(_) => Ok(LinkOrCopy::Copy),
91 pub enum RenameOrCopyRemove {
96 /// Rename `p` into `q`, preferring to use `rename` if possible.
97 /// If `rename` fails (rename may fail for reasons such as crossing
98 /// filesystem), fallback to copy & remove
99 pub fn rename_or_copy_remove<P: AsRef<Path>, Q: AsRef<Path>>(p: P,
101 -> io::Result<RenameOrCopyRemove> {
104 match fs::rename(p, q) {
105 Ok(()) => Ok(RenameOrCopyRemove::Rename),
107 match fs::copy(p, q) {
110 Ok(RenameOrCopyRemove::CopyRemove)
119 pub fn path2cstr(p: &Path) -> CString {
120 use std::os::unix::prelude::*;
122 let p: &OsStr = p.as_ref();
123 CString::new(p.as_bytes()).unwrap()
126 pub fn path2cstr(p: &Path) -> CString {
127 CString::new(p.to_str().unwrap()).unwrap()