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// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use error::Error as StdError;
use ffi::{CString, CStr, OsString, OsStr};
use fmt;
use io;
use iter;
use libc::{self, c_int, c_char};
use path::{self, PathBuf};
use slice;
use str;
use sys::{unsupported, Void};
use sys::horizon::ext::ffi::{OsStrExt, OsStringExt};
const TMPBUF_SZ: usize = 128;
extern "C" {
fn __errno() -> *mut c_int;
}
/// Returns the platform-specific value of errno
pub fn errno() -> i32 {
unsafe {
(*__errno()) as i32
}
}
/// Gets a detailed string description for the given error number.
pub fn error_string(errno: i32) -> String {
extern {
#[cfg_attr(any(target_os = "linux", target_env = "newlib"),
link_name = "__xpg_strerror_r")]
fn strerror_r(errnum: c_int, buf: *mut c_char,
buflen: libc::size_t) -> c_int;
}
let mut buf = [0 as c_char; TMPBUF_SZ];
let p = buf.as_mut_ptr();
unsafe {
if strerror_r(errno as c_int, p, buf.len()) < 0 {
panic!("strerror_r failure");
}
let p = p as *const _;
str::from_utf8(CStr::from_ptr(p).to_bytes()).unwrap().to_owned()
}
}
pub fn getcwd() -> io::Result<PathBuf> {
let mut buf = Vec::with_capacity(512);
loop {
unsafe {
let ptr = buf.as_mut_ptr() as *mut libc::c_char;
if !libc::getcwd(ptr, buf.capacity()).is_null() {
let len = CStr::from_ptr(buf.as_ptr() as *const i8).to_bytes().len();
buf.set_len(len);
buf.shrink_to_fit();
return Ok(PathBuf::from(OsString::from_vec(buf)));
} else {
let error = io::Error::last_os_error();
if error.raw_os_error() != Some(libc::ERANGE) {
return Err(error);
}
}
// Trigger the internal buffer resizing logic of `Vec` by requiring
// more space than the current capacity.
let cap = buf.capacity();
buf.set_len(cap);
buf.reserve(1);
}
}
}
pub fn chdir(p: &path::Path) -> io::Result<()> {
let p: &OsStr = p.as_ref();
let p = CString::new(p.as_bytes())?;
unsafe {
match libc::chdir(p.as_ptr() as *const u8) == (0 as c_int) {
true => Ok(()),
false => Err(io::Error::last_os_error()),
}
}
}
pub struct SplitPaths<'a> {
iter: iter::Map<slice::Split<'a, u8, fn(&u8) -> bool>,
fn(&'a [u8]) -> PathBuf>,
}
pub fn split_paths(unparsed: &OsStr) -> SplitPaths {
fn bytes_to_path(b: &[u8]) -> PathBuf {
PathBuf::from(<OsStr as OsStrExt>::from_bytes(b))
}
fn is_colon(b: &u8) -> bool { *b == b':' }
let unparsed = unparsed.as_bytes();
SplitPaths {
iter: unparsed.split(is_colon as fn(&u8) -> bool)
.map(bytes_to_path as fn(&[u8]) -> PathBuf)
}
}
impl<'a> Iterator for SplitPaths<'a> {
type Item = PathBuf;
fn next(&mut self) -> Option<PathBuf> { self.iter.next() }
fn size_hint(&self) -> (usize, Option<usize>) { self.iter.size_hint() }
}
#[derive(Debug)]
pub struct JoinPathsError;
pub fn join_paths<I, T>(paths: I) -> Result<OsString, JoinPathsError>
where I: Iterator<Item=T>, T: AsRef<OsStr>
{
let mut joined = Vec::new();
let sep = b':';
for (i, path) in paths.enumerate() {
let path = path.as_ref().as_bytes();
if i > 0 { joined.push(sep) }
if path.contains(&sep) {
return Err(JoinPathsError)
}
joined.extend_from_slice(path);
}
Ok(OsStringExt::from_vec(joined))
}
impl fmt::Display for JoinPathsError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
"path segment contains separator `:`".fmt(f)
}
}
impl StdError for JoinPathsError {
fn description(&self) -> &str { "failed to join paths" }
}
pub fn current_exe() -> io::Result<PathBuf> {
unsupported()
}
pub struct Env(Void);
impl Iterator for Env {
type Item = (OsString, OsString);
fn next(&mut self) -> Option<(OsString, OsString)> {
match self.0 {}
}
}
pub fn env() -> Env {
panic!("not supported on 3DS yet")
}
pub fn getenv(_k: &OsStr) -> io::Result<Option<OsString>> {
return Ok(None)
}
pub fn setenv(_k: &OsStr, _v: &OsStr) -> io::Result<()> {
unsupported()
}
pub fn unsetenv(_n: &OsStr) -> io::Result<()> {
unsupported()
}
pub fn temp_dir() -> PathBuf {
PathBuf::from("/tmp")
}
pub fn home_dir() -> Option<PathBuf> {
None
}
pub fn exit(code: i32) -> ! {
unsafe { libc::exit(code as c_int) }
}
pub fn getpid() -> u32 {
panic!("no pids on 3DS")
}
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