Function svn_path_cstring_from_utf8 

pub unsafe extern "C" fn svn_path_cstring_from_utf8(
    path_apr: *mut *const c_char,
    path_utf8: *const c_char,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

Convert @a path_utf8 from UTF-8 to the internal encoding used by APR.