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
use crate::LengthHint;
use crate::Writeable;
use core::convert::TryFrom;
use core::fmt;
use core::str;
impl Writeable for u8 {
fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
let mut buf = [b'0'; 3];
let mut n = *self;
let mut i = 3usize;
while n != 0 {
i -= 1;
buf[i] = b'0' + (n % 10);
n /= 10;
}
if i == 3 {
debug_assert_eq!(*self, 0);
i = 2;
}
let s = unsafe { str::from_utf8_unchecked(&buf[i..]) };
sink.write_str(s)
}
fn write_len(&self) -> LengthHint {
if *self < 10 {
LengthHint::Exact(1)
} else if *self < 100 {
LengthHint::Exact(2)
} else {
LengthHint::Exact(3)
}
}
}
impl Writeable for u16 {
fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
let mut buf = [b'0'; 5];
let mut n = *self;
let mut i = 5usize;
while n != 0 {
i -= 1;
buf[i] = b'0' + u8::try_from(n % 10).expect("<10");
n /= 10;
}
if i == 5 {
debug_assert_eq!(*self, 0);
i = 4;
}
let s = unsafe { str::from_utf8_unchecked(&buf[i..]) };
sink.write_str(s)
}
fn write_len(&self) -> LengthHint {
if *self < 10 {
LengthHint::Exact(1)
} else if *self < 100 {
LengthHint::Exact(2)
} else if *self < 1000 {
LengthHint::Exact(3)
} else if *self < 10000 {
LengthHint::Exact(4)
} else {
LengthHint::Exact(5)
}
}
}
#[test]
fn test_u8() {
use crate::assert_writeable_eq;
assert_writeable_eq!("0", &0u8);
assert_writeable_eq!("1", &1u8);
assert_writeable_eq!("10", &10u8);
assert_writeable_eq!("99", &99u8);
assert_writeable_eq!("255", &255u8);
}
#[test]
fn test_u16() {
use crate::assert_writeable_eq;
assert_writeable_eq!("0", &0u16);
assert_writeable_eq!("1", &1u16);
assert_writeable_eq!("10", &10u16);
assert_writeable_eq!("99", &99u16);
assert_writeable_eq!("65535", &65535u16);
}