Function is_hex

crates/openshell-vfio/src/sysfs.rs:197–199

(b: u8)

}

fn is_hex(b: u8) -> bool {
    b.is_ascii_hexdigit()
}

/// Returns `true` if `data` contains only safe characters for sysfs values
/// (alphanumeric plus `:`, `.`, `-`, `_`).