armybox 0.3.0

A memory-safe #[no_std] BusyBox/Toybox clone in Rust - 299 Unix utilities in ~500KB
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

//! dos2unix - convert DOS line endings to Unix
//!
//! Converts CRLF line endings to LF.

use crate::io;
use crate::applets::get_arg;

/// dos2unix - convert DOS line endings to Unix
///
/// # Synopsis
/// ```text
/// dos2unix file...
/// ```
///
/// # Description
/// Convert DOS/Windows line endings (CRLF) to Unix line endings (LF).
/// Files are modified in place.
///
/// # Exit Status
/// - 0: Success
/// - >0: An error occurred
pub fn dos2unix(argc: i32, argv: *const *const u8) -> i32 {
    for i in 1..argc {
        if let Some(path) = unsafe { get_arg(argv, i) } {
            if path.len() > 0 && path[0] != b'-' {
                #[cfg(feature = "alloc")]
                {
                    let fd = io::open(path, libc::O_RDONLY, 0);
                    if fd < 0 { continue; }

                    let content = io::read_all(fd);
                    io::close(fd);

                    let fd = io::open(path, libc::O_WRONLY | libc::O_TRUNC, 0);
                    if fd < 0 { continue; }

                    for &c in &content {
                        if c != b'\r' {
                            io::write_all(fd, &[c]);
                        }
                    }
                    io::close(fd);
                }
            }
        }
    }
    0
}

#[cfg(test)]
mod tests {
    extern crate std;
    use std::sync::atomic::{AtomicUsize, Ordering};

    static TEST_COUNTER: AtomicUsize = AtomicUsize::new(0);
    use std::process::Command;
    use std::fs;
    use std::path::PathBuf;

    fn get_armybox_path() -> PathBuf {
        if let Ok(path) = std::env::var("ARMYBOX_PATH") {
            return PathBuf::from(path);
        }
        let manifest_dir = std::env::var("CARGO_MANIFEST_DIR")
            .map(PathBuf::from)
            .unwrap_or_else(|_| std::env::current_dir().unwrap());
        let release = manifest_dir.join("target/release/armybox");
        if release.exists() { return release; }
        manifest_dir.join("target/debug/armybox")
    }

    fn setup() -> PathBuf {
        let counter = TEST_COUNTER.fetch_add(1, Ordering::SeqCst);
        let dir = std::env::temp_dir().join(format!("armybox_dos2unix_test_{}_{}",  std::process::id(), counter));
        let _ = fs::remove_dir_all(&dir);
        fs::create_dir_all(&dir).unwrap();
        dir
    }

    fn cleanup(dir: &std::path::Path) {
        let _ = fs::remove_dir_all(dir);
    }

    #[test]
    fn test_dos2unix_basic() {
        let armybox = get_armybox_path();
        if !armybox.exists() { return; }

        let dir = setup();
        let file = dir.join("test.txt");
        fs::write(&file, "line1\r\nline2\r\n").unwrap();

        let output = Command::new(&armybox)
            .args(["dos2unix", file.to_str().unwrap()])
            .output()
            .unwrap();

        assert_eq!(output.status.code(), Some(0));
        let content = fs::read(&file).unwrap();
        assert_eq!(content, b"line1\nline2\n");
        cleanup(&dir);
    }

    #[test]
    fn test_dos2unix_no_crlf() {
        let armybox = get_armybox_path();
        if !armybox.exists() { return; }

        let dir = setup();
        let file = dir.join("test.txt");
        fs::write(&file, "already unix\n").unwrap();

        let output = Command::new(&armybox)
            .args(["dos2unix", file.to_str().unwrap()])
            .output()
            .unwrap();

        assert_eq!(output.status.code(), Some(0));
        let content = fs::read(&file).unwrap();
        assert_eq!(content, b"already unix\n");
        cleanup(&dir);
    }

    #[test]
    fn test_dos2unix_mixed_endings() {
        let armybox = get_armybox_path();
        if !armybox.exists() { return; }

        let dir = setup();
        let file = dir.join("test.txt");
        fs::write(&file, "dos\r\nunix\nmixed\r\n").unwrap();

        let output = Command::new(&armybox)
            .args(["dos2unix", file.to_str().unwrap()])
            .output()
            .unwrap();

        assert_eq!(output.status.code(), Some(0));
        let content = fs::read(&file).unwrap();
        assert_eq!(content, b"dos\nunix\nmixed\n");
        cleanup(&dir);
    }
}