SP_FILEMARKS
if (st_space(st, 0, SP_FILEMARKS, 0)) {
SP_FILEMARKS, flags);
error = st_space(st, 0, SP_FILEMARKS,
case SP_FILEMARKS:
} else if (what == SP_FILEMARKS) {
error = st_space(st, -*nmarks, SP_FILEMARKS, flags);
error = st_space(st, -1, SP_FILEMARKS, 0);