Function cc_render_html 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn cc_render_html(
    code: *const c_char,
    len: usize,
    language: i32,
    theme: i32,
    flags: u32,
) -> *mut c_char

Renders HTML. A valid theme index gives inline styles, -1 gives class names. Takes CC_HTML_* flags. Returns NULL for invalid UTF-8 or NUL bytes in the input. Free with cc_string_free.

Safety

code must be null or point to len readable bytes.