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Const calculate buffer size for strerror

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The current buffer size is hard set to 256. Using const evaluation, the
maximum buf size can be calculated at compile time.
This commit is contained in:
Josh Megnauth
2025-04-18 01:39:16 -04:00
parent baef620c7a
commit 1d5179eb71
3 changed files with 67 additions and 13 deletions
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src/header/string/mod.rs
+5 -7
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@@ -447,15 +447,13 @@ pub unsafe extern "C" fn strdup(s1: *const c_char) -> *mut c_char {
pub unsafe extern "C" fn strerror(errnum: c_int) -> *mut c_char {
use core::fmt::Write;
static mut strerror_buf: [u8; 256] = [0; 256];
static mut strerror_buf: [u8; STRERROR_MAX] = [0; STRERROR_MAX];
let mut w = platform::StringWriter(strerror_buf.as_mut_ptr(), strerror_buf.len());
if errnum >= 0 && errnum < STR_ERROR.len() as c_int {
let _ = w.write_str(STR_ERROR[errnum as usize]);
} else {
let _ = w.write_fmt(format_args!("Unknown error {}", errnum));
}
let _ = match STR_ERROR.get(errnum as usize) {
Some(e) => w.write_str(e),
None => w.write_fmt(format_args!("Unknown error {}", errnum)),
};
strerror_buf.as_mut_ptr() as *mut c_char
}