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
189
190
191
192
193
194
195
196
197
198
199
use super::chars::{Char16, Char8, NUL_16, NUL_8};
use core::convert::TryInto;
use core::fmt;
use core::iter::Iterator;
use core::result::Result;
use core::slice;
pub enum FromSliceWithNulError {
InvalidChar(usize),
InteriorNul(usize),
NotNulTerminated,
}
#[repr(transparent)]
pub struct CStr8([Char8]);
impl CStr8 {
pub unsafe fn from_ptr<'ptr>(ptr: *const Char8) -> &'ptr Self {
let mut len = 0;
while *ptr.add(len) != NUL_8 {
len += 1
}
let ptr = ptr as *const u8;
Self::from_bytes_with_nul_unchecked(slice::from_raw_parts(ptr, len + 1))
}
pub fn from_bytes_with_nul(chars: &[u8]) -> Result<&Self, FromSliceWithNulError> {
let nul_pos = chars.iter().position(|&c| c == 0);
if let Some(nul_pos) = nul_pos {
if nul_pos + 1 != chars.len() {
return Err(FromSliceWithNulError::InteriorNul(nul_pos));
}
Ok(unsafe { Self::from_bytes_with_nul_unchecked(chars) })
} else {
Err(FromSliceWithNulError::NotNulTerminated)
}
}
pub unsafe fn from_bytes_with_nul_unchecked(chars: &[u8]) -> &Self {
&*(chars as *const [u8] as *const Self)
}
pub fn as_ptr(&self) -> *const Char8 {
self.0.as_ptr()
}
pub fn to_bytes(&self) -> &[u8] {
let chars = self.to_bytes_with_nul();
&chars[..chars.len() - 1]
}
pub fn to_bytes_with_nul(&self) -> &[u8] {
unsafe { &*(&self.0 as *const [Char8] as *const [u8]) }
}
}
#[repr(transparent)]
pub struct CStr16([Char16]);
impl CStr16 {
pub unsafe fn from_ptr<'ptr>(ptr: *const Char16) -> &'ptr Self {
let mut len = 0;
while *ptr.add(len) != NUL_16 {
len += 1
}
let ptr = ptr as *const u16;
Self::from_u16_with_nul_unchecked(slice::from_raw_parts(ptr, len + 1))
}
pub fn from_u16_with_nul(codes: &[u16]) -> Result<&Self, FromSliceWithNulError> {
for (pos, &code) in codes.iter().enumerate() {
match code.try_into() {
Ok(NUL_16) => {
if pos != codes.len() - 1 {
return Err(FromSliceWithNulError::InteriorNul(pos));
} else {
return Ok(unsafe { Self::from_u16_with_nul_unchecked(codes) });
}
}
Err(_) => {
return Err(FromSliceWithNulError::InvalidChar(pos));
}
_ => {}
}
}
Err(FromSliceWithNulError::NotNulTerminated)
}
pub unsafe fn from_u16_with_nul_unchecked(codes: &[u16]) -> &Self {
&*(codes as *const [u16] as *const Self)
}
pub fn as_ptr(&self) -> *const Char16 {
self.0.as_ptr()
}
pub fn to_u16_slice(&self) -> &[u16] {
let chars = self.to_u16_slice_with_nul();
&chars[..chars.len() - 1]
}
pub fn to_u16_slice_with_nul(&self) -> &[u16] {
unsafe { &*(&self.0 as *const [Char16] as *const [u16]) }
}
pub fn iter(&self) -> CStr16Iter {
CStr16Iter {
inner: self,
pos: 0,
}
}
}
#[derive(Debug)]
pub struct CStr16Iter<'a> {
inner: &'a CStr16,
pos: usize,
}
impl<'a> Iterator for CStr16Iter<'a> {
type Item = &'a Char16;
fn next(&mut self) -> Option<Self::Item> {
if self.pos >= self.inner.0.len() - 1 {
None
} else {
self.pos += 1;
self.inner.0.get(self.pos - 1)
}
}
}
impl fmt::Debug for CStr16 {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "CStr16({:?})", &self.0)
}
}
impl fmt::Display for CStr16 {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
for c in self.iter() {
<Char16 as fmt::Display>::fmt(&c, f)?;
}
Ok(())
}
}