Function xmlACatalogResolve 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlACatalogResolve(
    catal: *mut XmlCatalogHandle,
    pubID: *const xmlChar,
    sysID: *const xmlChar,
) -> *mut xmlChar

Resolve public then system against a handle (upstream xmlACatalogResolve).

UPSTREAM-PARITY

Upstream xmlCatalogXMLResolve tries the system ID FIRST when provided (“First tries steps 2/3/4 if a system ID is provided”, catalog.c 2.15), then falls back to the public ID.

SAFETY

• catal must be a valid handle; pubID/sysID valid strings or NULL.