rogu 0.2.7

Simple logger library
Documentation 
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

///C stdlib baesd writer into stdout/stderr

use crate::data;
use core::{mem, cmp, ptr};

const BUFFER_CAPACITY: usize = 4096;

pub struct FdWriter {
    fd: u8,
    buffer: mem::MaybeUninit<[u8; BUFFER_CAPACITY]>,
    len: usize,
}

impl FdWriter {
    fn new(fd: u8, level: &'static str, location: &'static str) -> Self {
        let mut res = Self {
            fd,
            buffer: mem::MaybeUninit::uninit(),
            len: 0,
        };

        unsafe {
            ptr::copy_nonoverlapping(level.as_ptr(), res.buffer_as_mut_ptr(), level.len())
        }
        res.len += level.len();

        #[cfg(feature = "std")]
        {
            let time = crate::time::get();
            let time_str = time.as_str();

            unsafe {
                ptr::copy_nonoverlapping(time_str.as_ptr(), res.buffer_as_mut_ptr().add(res.len), time_str.len())
            }
            res.len += time_str.len();
        }

        unsafe {
            ptr::copy_nonoverlapping(location.as_ptr(), res.buffer_as_mut_ptr().add(res.len), location.len())
        }
        res.len += location.len();

        res
    }

    fn buffer(&self) -> &[u8; BUFFER_CAPACITY] {
        unsafe {
            &*(self.buffer.as_ptr())
        }
    }

    fn buffer_as_mut_ptr(&mut self) -> *mut u8 {
        unsafe {
            (*(self.buffer.as_mut_ptr())).as_mut_ptr()
        }
    }

    #[inline(always)]
    pub fn error(location: &'static str) -> Self {
        Self::new(2, data::level::ERROR, location)
    }

    #[inline(always)]
    pub fn warn(location: &'static str) -> Self {
        Self::new(2, data::level::WARN, location)
    }

    #[inline(always)]
    pub fn info(location: &'static str) -> Self {
        Self::new(1, data::level::INFO, location)
    }

    #[inline(always)]
    pub fn debug(location: &'static str) -> Self {
        Self::new(1, data::level::DEBUG, location)
    }

    #[inline(always)]
    pub fn trace(location: &'static str) -> Self {
        Self::new(1, data::level::TRACE, location)
    }

    fn flush(&mut self) {
        let text = unsafe {
            core::str::from_utf8_unchecked(&self.buffer()[..self.len])
        };
        unsafe {
            libc::write(self.fd.into(), text.as_ptr() as *const _, text.len() as _);
        }
        self.len = 0;
    }

    fn copy_text<'a>(&mut self, text: &'a str) -> &'a str {
        let write_len = cmp::min(BUFFER_CAPACITY.saturating_sub(self.len), text.len());
        unsafe {
            ptr::copy_nonoverlapping(text.as_ptr(), self.buffer_as_mut_ptr().add(self.len), write_len);
        }
        self.len += write_len;
        &text[write_len..]
    }

    #[cold]
    fn on_text_overflow<'a>(&mut self, mut text: &'a str) -> &'a str {
        loop {
            text = self.copy_text(text);
            self.flush();

            if text.len() <= BUFFER_CAPACITY {
                break text
            }
        }
    }

    fn write_text(&mut self, mut text: &str) {
        if text.len() > BUFFER_CAPACITY {
            self.on_text_overflow(text);
        }

        //At this point text.len() <= BUFFER_CAPACITY
        loop {
            text = self.copy_text(text);

            if text.len() == 0 {
                break;
            } else {
                self.flush();
            }
        }

        if self.buffer()[self.len - 1] == b'\n' {
            self.flush();
        }
    }
}

#[cfg(feature = "ufmt")]
impl ufmt::uWrite for FdWriter {
    type Error = core::convert::Infallible;

    #[inline]
    fn write_str(&mut self, text: &str) -> Result<(), Self::Error> {
        self.write_text(text);

        Ok(())
    }
}

#[cfg(not(feature = "ufmt"))]
impl core::fmt::Write for FdWriter {
    #[inline]
    fn write_str(&mut self, text: &str) -> core::fmt::Result {
        self.write_text(text);

        Ok(())
    }
}