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fix mallctl suite lints

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Signed-off-by: Jason Volk <jason@zemos.net>
This commit is contained in:
Jason Volk 2024-04-27 22:03:30 -07:00 • committed by June
parent 4faf690f57
commit 9f5d7b0761
1 changed files with 9 additions and 2 deletions
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11
src/alloc/je.rs
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@ -21,14 +21,17 @@ pub(crate) fn memory_usage() -> String {
)
}
#[allow(clippy::ptr_as_ptr)]
pub(crate) fn memory_stats() -> String {
const MAX_LENGTH: usize = 65536 - 4096;
let opts_s = "d";
let mut str: String = String::new();
let mut str = String::new();
let opaque: *mut c_void = &mut str as *mut _ as *mut c_void;
let opts_p: *const c_char = std::ffi::CString::new(opts_s).expect("cstring").into_raw() as *const c_char;
// SAFETY: calls malloc_stats_print() with our string instance which must remain in this frame.
unsafe { ffi::malloc_stats_print(Some(malloc_stats_cb), opaque, opts_p) };
str.truncate(MAX_LENGTH);
@ -36,8 +39,12 @@ pub(crate) fn memory_stats() -> String {
}
extern "C" fn malloc_stats_cb(opaque: *mut c_void, msg: *const c_char) {
let res: &mut String = unsafe { std::mem::transmute::<*mut c_void, &mut String>(opaque) };
// SAFETY: we have to trust the opaque points to our String
let res: &mut String = unsafe { &mut *opaque.cast::<String>() };
// SAFETY: we have to trust the string is null terminated.
let msg = unsafe { std::ffi::CStr::from_ptr(msg) };
let msg = String::from_utf8_lossy(msg.to_bytes());
res.push_str(msg.as_ref());
}