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#![deny(rustc::untranslatable_diagnostic)]
#![deny(rustc::diagnostic_outside_of_impl)]
use std::ffi::CString;
use std::fs;
use std::io;
use std::path::{Path, PathBuf};
// Unfortunately, on windows, it looks like msvcrt.dll is silently translating
// verbatim paths under the hood to non-verbatim paths! This manifests itself as
// gcc looking like it cannot accept paths of the form `\\?\C:\...`, but the
// real bug seems to lie in msvcrt.dll.
//
// Verbatim paths are generally pretty rare, but the implementation of
// `fs::canonicalize` currently generates paths of this form, meaning that we're
// going to be passing quite a few of these down to gcc, so we need to deal with
// this case.
//
// For now we just strip the "verbatim prefix" of `\\?\` from the path. This
// will probably lose information in some cases, but there's not a whole lot
// more we can do with a buggy msvcrt...
//
// For some more information, see this comment:
// https://github.com/rust-lang/rust/issues/25505#issuecomment-102876737
#[cfg(windows)]
pub fn fix_windows_verbatim_for_gcc(p: &Path) -> PathBuf {
use std::ffi::OsString;
use std::path;
let mut components = p.components();
let prefix = match components.next() {
Some(path::Component::Prefix(p)) => p,
_ => return p.to_path_buf(),
};
match prefix.kind() {
path::Prefix::VerbatimDisk(disk) => {
let mut base = OsString::from(format!("{}:", disk as char));
base.push(components.as_path());
PathBuf::from(base)
}
path::Prefix::VerbatimUNC(server, share) => {
let mut base = OsString::from(r"\\");
base.push(server);
base.push(r"\");
base.push(share);
base.push(components.as_path());
PathBuf::from(base)
}
_ => p.to_path_buf(),
}
}
#[cfg(not(windows))]
pub fn fix_windows_verbatim_for_gcc(p: &Path) -> PathBuf {
p.to_path_buf()
}
pub enum LinkOrCopy {
Link,
Copy,
}
/// Copies `p` into `q`, preferring to use hard-linking if possible. If
/// `q` already exists, it is removed first.
/// The result indicates which of the two operations has been performed.
pub fn link_or_copy<P: AsRef<Path>, Q: AsRef<Path>>(p: P, q: Q) -> io::Result<LinkOrCopy> {
let p = p.as_ref();
let q = q.as_ref();
match fs::remove_file(q) {
Ok(()) => (),
Err(err) if err.kind() == io::ErrorKind::NotFound => (),
Err(err) => return Err(err),
}
match fs::hard_link(p, q) {
Ok(()) => Ok(LinkOrCopy::Link),
Err(_) => match fs::copy(p, q) {
Ok(_) => Ok(LinkOrCopy::Copy),
Err(e) => Err(e),
},
}
}
#[cfg(unix)]
pub fn path_to_c_string(p: &Path) -> CString {
use std::ffi::OsStr;
use std::os::unix::ffi::OsStrExt;
let p: &OsStr = p.as_ref();
CString::new(p.as_bytes()).unwrap()
}
#[cfg(windows)]
pub fn path_to_c_string(p: &Path) -> CString {
CString::new(p.to_str().unwrap()).unwrap()
}
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