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use super::posix;
use core::{mem, ptr, slice};
use core::ops::{Deref, DerefMut};
fn must_succeed<T>(p: *mut T) -> *mut T {
assert!(!p.is_null(), "allocation failure");
p
}
fn zst<T>(count: usize) -> bool {
mem::size_of::<T>() == 0 || count == 0
}
fn alloc<T>(count: usize) -> *mut T {
if zst::<T>(count) {
return ptr::null_mut();
}
let size = count * mem::size_of::<T>();
let align = mem::align_of::<T>();
must_succeed(
unsafe {
libc::memalign(align as libc::size_t, size as libc::size_t) as *mut T
}
)
}
fn dangling<T>() -> *mut T {
mem::align_of::<T>() as *mut T
}
fn check_ptr<T>(p: *const T, len: usize) {
debug_assert!((p as usize) % mem::align_of::<T>() == 0, "unaligned ptr");
assert!(zst::<T>(len) || !p.is_null(), "NULL ptr");
}
fn slice_len<T>(p: *const [T]) -> usize {
unsafe { mem::transmute::<*const [T], [usize; 2]>(p)[1] }
}
pub struct CBox<T: ?Sized>(*mut T);
impl<T: ?Sized> CBox<T> {
pub unsafe fn from_raw_unchecked(p: *mut T) -> CBox<T> {
CBox(p)
}
pub fn into_raw(self) -> *mut T {
let p = self.0;
mem::forget(self);
p
}
pub fn as_ptr(&self) -> *const T {
self.0
}
pub fn as_mut_ptr(&mut self) -> *mut T {
self.0
}
}
impl<T> CBox<T> {
pub fn new(value: T) -> CBox<T> {
let p = alloc(1);
unsafe {
ptr::write(p, value);
CBox::from_raw_unchecked(p)
}
}
pub unsafe fn from_raw(p: *mut T) -> CBox<T> {
check_ptr(p, 1);
CBox(p)
}
pub unsafe fn slice_from_raw_parts_unchecked(p: *mut T, len: usize) -> CBox<[T]> {
CBox(ptr::slice_from_raw_parts_mut(p, len))
}
pub unsafe fn slice_from_raw_parts(p: *mut T, len: usize) -> CBox<[T]> {
check_ptr(p, len);
CBox::slice_from_raw_parts_unchecked(p, len)
}
fn safe_ptr(&self) -> *mut T {
if self.0.is_null() {
debug_assert!(zst::<T>(1), "NULL ptr");
return dangling();
}
self.0
}
}
impl<T> CBox<[T]> {
fn safe_ptr(&self) -> *mut [T] {
if self.0.is_null() {
let len = slice_len(self.0);
debug_assert!(zst::<T>(len), "NULL ptr");
return ptr::slice_from_raw_parts_mut(dangling(), len);
}
self.0
}
}
impl<T: ?Sized> Drop for CBox<T> {
fn drop(&mut self) {
unsafe {
ptr::drop_in_place(self.0);
libc::free(self.0 as *mut libc::c_void);
}
}
}
impl<T> Deref for CBox<T> {
type Target = T;
fn deref(&self) -> &T {
unsafe { &*self.safe_ptr() }
}
}
impl<T> DerefMut for CBox<T> {
fn deref_mut(&mut self) -> &mut T {
unsafe { &mut *self.safe_ptr() }
}
}
impl<T> Deref for CBox<[T]> {
type Target = [T];
fn deref(&self) -> &[T] {
unsafe { &*self.safe_ptr() }
}
}
impl<T> DerefMut for CBox<[T]> {
fn deref_mut(&mut self) -> &mut [T] {
unsafe { &mut *self.safe_ptr() }
}
}
//pub struct FromBytesWithNulError {}
pub struct CStr { inner: libc::c_char }
impl CStr {
pub unsafe fn from_ptr_unchecked<'a>(p: *const libc::c_char) -> &'a CStr {
&*(p as *const CStr)
}
pub unsafe fn from_ptr<'a>(p: *const libc::c_char) -> &'a CStr {
check_ptr(p, 1);
CStr::from_ptr_unchecked(p)
}
pub unsafe fn from_mut_ptr_unchecked<'a>(p: *mut libc::c_char) -> &'a mut CStr {
&mut *(p as *mut CStr)
}
pub unsafe fn from_mut_ptr<'a>(p: *mut libc::c_char) -> &'a mut CStr {
check_ptr(p, 1);
CStr::from_mut_ptr_unchecked(p)
}
pub unsafe fn from_bytes_with_nul_unchecked(bytes: &[u8]) -> &CStr {
CStr::from_ptr_unchecked(bytes.as_ptr() as *const libc::c_char)
}
// TODO
//pub fn from_bytes_with_nul(bytes: &[u8]) -> Result<&CStr, FromBytesWithNulError> {
//}
pub fn len(&self) -> usize {
unsafe { libc::strlen(self.as_ptr()) as usize }
}
pub const fn as_ptr(&self) -> *const libc::c_char {
&self.inner
}
pub fn as_mut_ptr(&mut self) -> *mut libc::c_char {
&mut self.inner
}
pub fn as_bytes(&self) -> &[u8] {
unsafe { slice::from_raw_parts(
self.as_ptr() as *const u8,
self.len(),
) }
}
pub fn as_mut_bytes(&mut self) -> &mut [u8] {
unsafe { slice::from_raw_parts_mut(
self.as_mut_ptr() as *mut u8,
self.len(),
) }
}
pub fn to_owned(self: &CStr) -> CString {
CString::from(self)
}
}
#[macro_export]
macro_rules! cstr {
($s:expr) => (
unsafe { $crate::c::string::CStr::from_bytes_with_nul_unchecked(concat!($s, "\0").as_bytes()) }
)
}
pub struct CString { inner: CBox<libc::c_char> }
impl CString {
pub unsafe fn from_raw_unchecked(p: *mut libc::c_char) -> CString {
CString { inner: CBox::from_raw_unchecked(p) }
}
pub unsafe fn from_raw(p: *mut libc::c_char) -> CString {
CString { inner: CBox::from_raw(p) }
}
pub fn into_raw(self) -> *mut libc::c_char {
self.inner.into_raw()
}
}
impl Deref for CString {
type Target = CStr;
fn deref(&self) -> &CStr {
unsafe { CStr::from_ptr(&*self.inner) }
}
}
impl DerefMut for CString {
fn deref_mut(&mut self) -> &mut CStr {
unsafe { CStr::from_mut_ptr(&mut *self.inner) }
}
}
impl From<&[u8]> for CString {
fn from(s: &[u8]) -> CString {
unsafe {
CString::from_raw_unchecked(must_succeed(posix::strndup(
s.as_ptr() as *const libc::c_char,
s.len() as libc::size_t,
)))
}
}
}
impl From<&str> for CString {
fn from(s: &str) -> CString {
CString::from(s.as_bytes())
}
}
impl From<&CStr> for CString {
fn from(s: &CStr) -> CString {
unsafe {
CString::from_raw_unchecked(must_succeed(libc::strdup(s.as_ptr())))
}
}
}
|
