SC_HISTORY_SIZE
min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
min_lines = imax(SC_HISTORY_SIZE, scp->ysize);
min_lines = imax(SC_HISTORY_SIZE, prev_ysize);
#if !defined(SC_HISTORY_SIZE)
#if (SC_HISTORY_SIZE * MAXCONS * NSC) > SC_MAX_HISTORY_SIZE
#define SC_MAX_HISTORY_SIZE (SC_HISTORY_SIZE * MAXCONS * NSC)
static int extra_history_size = SC_MAX_HISTORY_SIZE - SC_HISTORY_SIZE*MAXCONS;
lines = SC_HISTORY_SIZE; /* use the default value */