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fixes

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This commit is contained in:
Matthias Schiffer 2019-08-09 22:41:26 +02:00
parent 709f755da6
commit 9aae18d764
Signed by: neocturne
GPG key ID: 16EF3F64CB201D9C
1 changed files with 23 additions and 23 deletions
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46
src/c/string.rs
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@ -2,8 +2,6 @@ use super::posix;
use core::{mem, ptr, slice};
use core::ops::{Deref, DerefMut};
const SENTINEL: *mut libc::c_void = 1 as *mut libc::c_void;
fn must_succeed<T>(p: *mut T) -> *mut T {
if p.is_null() {
panic!("allocation failure");
@ -13,17 +11,28 @@ fn must_succeed<T>(p: *mut T) -> *mut T {
fn malloc<T>() -> *mut T {
let size = mem::size_of::<T>();
let align = mem::align_of::<T>();
if size == 0 {
return SENTINEL as *mut T;
return align as *mut T;
}
must_succeed(
unsafe {libc::memalign(mem::align_of::<T>() as libc::size_t, size as libc::size_t) }
) as *mut T
unsafe {
libc::memalign(align as libc::size_t, size as libc::size_t) as *mut T
}
)
}
pub struct CBox<T: ?Sized>(*mut T);
pub struct CBox<T>(*mut T);
impl<T> CBox<T> {
pub fn new(value: T) -> CBox<T> {
let p = malloc();
unsafe {
ptr::write(p, value);
CBox::from_raw(p)
}
}
impl<T: ?Sized> CBox<T> {
pub const unsafe fn from_raw(p: *mut T) -> CBox<T> {
CBox(p)
}
@ -43,27 +52,18 @@ impl<T: ?Sized> CBox<T> {
}
}
impl<T> CBox<T> {
pub fn new(value: T) -> CBox<T> {
let p = malloc();
unsafe {
ptr::write(p, value);
CBox::from_raw(p)
}
}
}
impl<T: ?Sized> Drop for CBox<T> {
impl<T> Drop for CBox<T> {
fn drop(&mut self) {
unsafe { ptr::drop_in_place(self.0); }
let p = self.0 as *mut libc::c_void;
if p != SENTINEL {
unsafe { libc::free(p); }
if mem::size_of::<T>() != 0 {
unsafe {
libc::free(self.0 as *mut libc::c_void);
}
}
}
}
impl<T: ?Sized> Deref for CBox<T> {
impl<T> Deref for CBox<T> {
type Target = T;
fn deref(&self) -> &T {
@ -71,7 +71,7 @@ impl<T: ?Sized> Deref for CBox<T> {
}
}
impl<T: ?Sized> DerefMut for CBox<T> {
impl<T> DerefMut for CBox<T> {
fn deref_mut(&mut self) -> &mut T {
unsafe { &mut *self.0 }
}