Function pio_geo_parse 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pio_geo_parse(
    text: *const c_char,
    name_hint: *const c_char,
    errbuf: *mut c_char,
    errlen: usize,
) -> *mut c_char

Normalize a tolerant geographic sidecar (headerless buscoords CSV, aliased CSV/JSON records, GeoJSON Point/LineString) to the canonical GeoJSON form. name_hint (a file name, nullable) picks CSV against JSON when given; otherwise the content is sniffed. The tolerant reader’s notes are not returned here; parse through the Rust or Python surface to see them. Free the returned string with pio_string_free. Returns NULL on input that carries no usable coordinates and writes the message into errbuf.