Macro sanitized 

macro_rules! sanitized {
    ($expr:expr) => { ... };
}

Sanitize untrusted input for inclusion in error messages.

Behavior

• Truncates strings to MAX_SANITIZED_LEN characters, respecting UTF-8 boundaries.
• Replaces control characters with ‘?’ to prevent log injection or formatting issues.
• Handles non-string types by converting to string first.
• For fully control-char inputs exceeding length, uses “[INVALID_INPUT]”.

Allocation

• Allocates a new String for the sanitized output.

Example

let long = "A".repeat(300);
let san = sanitized!(long);
assert!(san.len() <= 256 + 13);
assert!(san.ends_with("[TRUNCATED]"));