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use prelude::*;
use fmt;
use io::{IoResult, IoError};
use iter::repeat;
use libc::{c_int, c_void};
use libc;
use os;
use path::BytesContainer;
use ptr;
use slice;
use sys::fs::FileDesc;
use os::TMPBUF_SZ;
use libc::types::os::arch::extra::DWORD;
const BUF_BYTES : uint = 2048u;
pub fn truncate_utf16_at_nul<'a>(v: &'a [u16]) -> &'a [u16] {
match v.iter().position(|c| *c == 0) {
Some(i) => v[..i],
None => v
}
}
pub fn errno() -> uint {
use libc::types::os::arch::extra::DWORD;
#[link_name = "kernel32"]
extern "system" {
fn GetLastError() -> DWORD;
}
unsafe {
GetLastError() as uint
}
}
pub fn error_string(errnum: i32) -> String {
use libc::types::os::arch::extra::DWORD;
use libc::types::os::arch::extra::LPWSTR;
use libc::types::os::arch::extra::LPVOID;
use libc::types::os::arch::extra::WCHAR;
#[link_name = "kernel32"]
extern "system" {
fn FormatMessageW(flags: DWORD,
lpSrc: LPVOID,
msgId: DWORD,
langId: DWORD,
buf: LPWSTR,
nsize: DWORD,
args: *const c_void)
-> DWORD;
}
static FORMAT_MESSAGE_FROM_SYSTEM: DWORD = 0x00001000;
static FORMAT_MESSAGE_IGNORE_INSERTS: DWORD = 0x00000200;
let langId = 0x0800 as DWORD;
let mut buf = [0 as WCHAR, ..TMPBUF_SZ];
unsafe {
let res = FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
ptr::null_mut(),
errnum as DWORD,
langId,
buf.as_mut_ptr(),
buf.len() as DWORD,
ptr::null());
if res == 0 {
let fm_err = errno();
return format!("OS Error {} (FormatMessageW() returned error {})", errnum, fm_err);
}
let msg = String::from_utf16(truncate_utf16_at_nul(&buf));
match msg {
Ok(msg) => format!("OS Error {}: {}", errnum, msg),
Err(..) => format!("OS Error {} (FormatMessageW() returned \
invalid UTF-16)", errnum),
}
}
}
pub unsafe fn pipe() -> IoResult<(FileDesc, FileDesc)> {
let mut fds = [0, ..2];
match libc::pipe(fds.as_mut_ptr(), 1024 as ::libc::c_uint,
(libc::O_BINARY | libc::O_NOINHERIT) as c_int) {
0 => {
assert!(fds[0] != -1 && fds[0] != 0);
assert!(fds[1] != -1 && fds[1] != 0);
Ok((FileDesc::new(fds[0], true), FileDesc::new(fds[1], true)))
}
_ => Err(IoError::last_error()),
}
}
pub fn fill_utf16_buf_and_decode<F>(mut f: F) -> Option<String> where
F: FnMut(*mut u16, DWORD) -> DWORD,
{
unsafe {
let mut n = TMPBUF_SZ as DWORD;
let mut res = None;
let mut done = false;
while !done {
let mut buf: Vec<u16> = repeat(0u16).take(n as uint).collect();
let k = f(buf.as_mut_ptr(), n);
if k == (0 as DWORD) {
done = true;
} else if k == n &&
libc::GetLastError() ==
libc::ERROR_INSUFFICIENT_BUFFER as DWORD {
n *= 2 as DWORD;
} else if k >= n {
n = k;
} else {
done = true;
}
if k != 0 && done {
let sub = buf.slice(0, k as uint);
let s = String::from_utf16(sub).ok()
.expect("fill_utf16_buf_and_decode: closure created invalid UTF-16");
res = Some(s)
}
}
return res;
}
}
pub fn getcwd() -> IoResult<Path> {
use libc::DWORD;
use libc::GetCurrentDirectoryW;
use io::OtherIoError;
let mut buf = [0 as u16, ..BUF_BYTES];
unsafe {
if libc::GetCurrentDirectoryW(buf.len() as DWORD, buf.as_mut_ptr()) == 0 as DWORD {
return Err(IoError::last_error());
}
}
match String::from_utf16(truncate_utf16_at_nul(&buf)) {
Ok(ref cwd) => Ok(Path::new(cwd)),
Err(..) => Err(IoError {
kind: OtherIoError,
desc: "GetCurrentDirectoryW returned invalid UTF-16",
detail: None,
}),
}
}
pub unsafe fn get_env_pairs() -> Vec<Vec<u8>> {
use libc::funcs::extra::kernel32::{
GetEnvironmentStringsW,
FreeEnvironmentStringsW
};
let ch = GetEnvironmentStringsW();
if ch as uint == 0 {
panic!("os::env() failure getting env string from OS: {}",
os::last_os_error());
}
let mut result = Vec::new();
let mut i = 0;
while *ch.offset(i) != 0 {
let p = &*ch.offset(i);
let mut len = 0;
while *(p as *const _).offset(len) != 0 {
len += 1;
}
let p = p as *const u16;
let s = slice::from_raw_buf(&p, len as uint);
result.push(String::from_utf16_lossy(s).into_bytes());
i += len as int + 1;
}
FreeEnvironmentStringsW(ch);
result
}
pub fn split_paths(unparsed: &[u8]) -> Vec<Path> {
let mut parsed = Vec::new();
let mut in_progress = Vec::new();
let mut in_quote = false;
for b in unparsed.iter() {
match *b {
b';' if !in_quote => {
parsed.push(Path::new(in_progress.as_slice()));
in_progress.truncate(0)
}
b'"' => {
in_quote = !in_quote;
}
_ => {
in_progress.push(*b);
}
}
}
parsed.push(Path::new(in_progress));
parsed
}
pub fn join_paths<T: BytesContainer>(paths: &[T]) -> Result<Vec<u8>, &'static str> {
let mut joined = Vec::new();
let sep = b';';
for (i, path) in paths.iter().map(|p| p.container_as_bytes()).enumerate() {
if i > 0 { joined.push(sep) }
if path.contains(&b'"') {
return Err("path segment contains `\"`");
} else if path.contains(&sep) {
joined.push(b'"');
joined.push_all(path);
joined.push(b'"');
} else {
joined.push_all(path);
}
}
Ok(joined)
}
pub fn load_self() -> Option<Vec<u8>> {
unsafe {
fill_utf16_buf_and_decode(|buf, sz| {
libc::GetModuleFileNameW(0u as libc::DWORD, buf, sz)
}).map(|s| s.to_string().into_bytes())
}
}
pub fn chdir(p: &Path) -> IoResult<()> {
let mut p = p.as_str().unwrap().utf16_units().collect::<Vec<u16>>();
p.push(0);
unsafe {
match libc::SetCurrentDirectoryW(p.as_ptr()) != (0 as libc::BOOL) {
true => Ok(()),
false => Err(IoError::last_error()),
}
}
}
pub fn page_size() -> uint {
use mem;
unsafe {
let mut info = mem::zeroed();
libc::GetSystemInfo(&mut info);
return info.dwPageSize as uint;
}
}
#[cfg(test)]
mod tests {
use super::truncate_utf16_at_nul;
#[test]
fn test_truncate_utf16_at_nul() {
let v = [];
let b: &[u16] = &[];
assert_eq!(truncate_utf16_at_nul(&v), b);
let v = [0, 2, 3];
assert_eq!(truncate_utf16_at_nul(&v), b);
let v = [1, 0, 3];
let b: &[u16] = &[1];
assert_eq!(truncate_utf16_at_nul(&v), b);
let v = [1, 2, 0];
let b: &[u16] = &[1, 2];
assert_eq!(truncate_utf16_at_nul(&v), b);
let v = [1, 2, 3];
let b: &[u16] = &[1, 2, 3];
assert_eq!(truncate_utf16_at_nul(&v), b);
}
}