c-scape 0.22.3

A libc bottom-half implementation in Rust
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
157
158
159
160
161
162
163
164
165
166
167
168
169

// `__*_chk` functions that have to live in c-gull because they depend on
// C functions not in the libc crate, due to `VaList` being unstable.

use core::ffi::VaList;
use libc::{c_char, c_int, size_t};

extern "C" {
    #[cold]
    fn __chk_fail() -> !;
}

// <https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib---snprintf-chk-1.html>
#[no_mangle]
unsafe extern "C" fn __snprintf_chk(
    ptr: *mut c_char,
    len: size_t,
    flag: c_int,
    slen: size_t,
    fmt: *const c_char,
    args: ...
) -> c_int {
    __vsnprintf_chk(ptr, len, flag, slen, fmt, args)
}

// <https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib---vsnprintf-chk-1.html>
#[no_mangle]
unsafe extern "C" fn __vsnprintf_chk(
    ptr: *mut c_char,
    len: size_t,
    flag: c_int,
    slen: size_t,
    fmt: *const c_char,
    va_list: VaList<'_>,
) -> c_int {
    if slen < len {
        __chk_fail();
    }

    if flag > 0 {
        unimplemented!("__USE_FORTIFY_LEVEL > 0");
    }

    super::vsnprintf(ptr, len, fmt, va_list)
}

// <https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib---sprintf-chk-1.html>
#[no_mangle]
unsafe extern "C" fn __sprintf_chk(
    ptr: *mut c_char,
    flag: c_int,
    strlen: size_t,
    format: *const c_char,
    args: ...
) -> c_int {
    __vsprintf_chk(ptr, flag, strlen, format, args)
}

#[no_mangle]
unsafe extern "C" fn __vsprintf_chk(
    ptr: *mut c_char,
    flag: c_int,
    strlen: size_t,
    fmt: *const c_char,
    va_list: VaList<'_>,
) -> c_int {
    if flag > 0 {
        unimplemented!("__USE_FORTIFY_LEVEL > 0");
    }

    if strlen == 0 {
        __chk_fail();
    }

    // We can't check `vsprintf` up front, so do a `vsnprintf` and check the
    // results.
    let n = super::vsnprintf(ptr, strlen, fmt, va_list);
    if n >= 0 && n as size_t >= strlen {
        __chk_fail();
    }
    n
}

// <https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib---fprintf-chk-1.html>
#[no_mangle]
unsafe extern "C" fn __fprintf_chk(
    file: *mut libc::FILE,
    flag: c_int,
    fmt: *const c_char,
    args: ...
) -> c_int {
    __vfprintf_chk(file, flag, fmt, args)
}

// <https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib---vfprintf-chk-1.html>
#[no_mangle]
unsafe extern "C" fn __vfprintf_chk(
    file: *mut libc::FILE,
    flag: c_int,
    fmt: *const c_char,
    va_list: VaList<'_>,
) -> c_int {
    if flag > 0 {
        unimplemented!("__USE_FORTIFY_LEVEL > 0");
    }

    // Our `printf` uses `printf_compat` which doesn't support `%n`.

    super::vfprintf(file, fmt, va_list)
}

// <https://refspecs.linuxbase.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/baselib---printf-chk-1.html>
#[no_mangle]
unsafe extern "C" fn __printf_chk(flag: c_int, fmt: *const c_char, args: ...) -> c_int {
    __vprintf_chk(flag, fmt, args)
}

#[no_mangle]
unsafe extern "C" fn __vprintf_chk(flag: c_int, fmt: *const c_char, va_list: VaList<'_>) -> c_int {
    if flag > 0 {
        unimplemented!("__USE_FORTIFY_LEVEL > 0");
    }

    // Our `printf` uses `printf_compat` which doesn't support `%n`.

    super::vprintf(fmt, va_list)
}

#[no_mangle]
unsafe extern "C" fn __asprintf_chk(
    strp: *mut *mut c_char,
    flag: c_int,
    fmt: *const c_char,
    args: ...
) -> c_int {
    __vasprintf_chk(strp, flag, fmt, args)
}

#[no_mangle]
unsafe extern "C" fn __vasprintf_chk(
    strp: *mut *mut c_char,
    flag: c_int,
    fmt: *const c_char,
    va_list: VaList<'_>,
) -> c_int {
    if flag > 0 {
        unimplemented!("__USE_FORTIFY_LEVEL > 0");
    }

    super::vasprintf(strp, fmt, va_list)
}

#[no_mangle]
unsafe extern "C" fn __dprintf_chk(fd: c_int, flag: c_int, fmt: *const c_char, args: ...) -> c_int {
    __vdprintf_chk(fd, flag, fmt, args)
}

#[no_mangle]
unsafe extern "C" fn __vdprintf_chk(
    fd: c_int,
    flag: c_int,
    fmt: *const c_char,
    va_list: VaList<'_>,
) -> c_int {
    if flag > 0 {
        unimplemented!("__USE_FORTIFY_LEVEL > 0");
    }

    super::vdprintf(fd, fmt, va_list)
}