INPUT_BUF_START
if (ictx->input_space > INPUT_BUF_START) {
ictx->input_space = INPUT_BUF_START;
ictx->input_buf = xrealloc(ictx->input_buf, INPUT_BUF_START);
ictx->input_space = INPUT_BUF_START;
ictx->input_buf = xmalloc(INPUT_BUF_START);