VBF_DEFAULT_HISTORY_SIZE
vb->vb_history_size = VBF_DEFAULT_HISTORY_SIZE;
static term_char_t vt_constextbuf[(_VTDEFW) * (VBF_DEFAULT_HISTORY_SIZE)];
static term_char_t *vt_constextbufrows[VBF_DEFAULT_HISTORY_SIZE];
.vb_history_size = VBF_DEFAULT_HISTORY_SIZE,