Function svn_path_cstring_to_utf8 

pub unsafe extern "C" fn svn_path_cstring_to_utf8(
    path_utf8: *mut *const c_char,
    path_apr: *const c_char,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

Convert @a path_apr from the internal encoding used by APR to UTF-8.