setpenattr
int (*setpenattr)(VTermAttr attr, VTermValue *val, void *user);
if(state->callbacks && state->callbacks->setpenattr)
(*state->callbacks->setpenattr)(attr, val, state->cbdata);
setpenattr(state, attr, VTERM_VALUETYPE_BOOL, &val);
setpenattr(state, attr, VTERM_VALUETYPE_INT, &val);
setpenattr(state, attr, VTERM_VALUETYPE_COLOR, &val);
.setpenattr = &setpenattr,