1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
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");
}
p
}
fn malloc<T>() -> *mut T {
let size = mem::size_of::<T>();
if size == 0 {
return SENTINEL as *mut T;
}
must_succeed(
unsafe {libc::memalign(mem::align_of::<T>() as libc::size_t, size as libc::size_t) }
) as *mut T
}
pub struct CBox<T: ?Sized>(*mut T);
impl<T: ?Sized> CBox<T> {
pub const unsafe fn from_raw(p: *mut T) -> CBox<T> {
CBox(p)
}
pub fn into_raw(self) -> *mut T {
let p = self.0;
mem::forget(self);
p
}
pub const 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 = malloc();
unsafe {
ptr::write(p, value);
CBox::from_raw(p)
}
}
}
impl<T: ?Sized> 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); }
}
}
}
impl<T: ?Sized> Deref for CBox<T> {
type Target = T;
fn deref(&self) -> &T {
unsafe { &*self.0 }
}
}
impl<T: ?Sized> DerefMut for CBox<T> {
fn deref_mut(&mut self) -> &mut T {
unsafe { &mut *self.0 }
}
}
//pub struct FromBytesWithNulError {}
pub struct CStr { inner: libc::c_char }
impl CStr {
pub unsafe fn from_ptr<'a>(p: *const libc::c_char) -> &'a CStr {
&*(p as *const CStr)
}
pub unsafe fn from_ptr_mut<'a>(p: *mut libc::c_char) -> &'a mut CStr {
&mut *(p as *mut CStr)
}
pub unsafe fn from_bytes_with_nul_unchecked(bytes: &[u8]) -> &CStr {
CStr::from_ptr(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_bytes_mut(&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(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_ptr_mut(&mut *self.inner) }
}
}
impl From<&[u8]> for CString {
fn from(s: &[u8]) -> CString {
unsafe {
CString::from_raw(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(must_succeed(libc::strdup(s.as_ptr())))
}
}
}
|
