/* move one line up */
int
sc_hist_up_line(scr_stat *scp)
{
if (sc_vtb_pos(scp->history, scp->history_pos, -(scp->xsize*scp->ysize))
== sc_vtb_tail(scp->history))
return -1;
scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos,
-scp->xsize);
history_to_screen(scp);
return 0;
}
/* go to the top of the history buffer */
void
sc_hist_end(scr_stat *scp)
{
scp->history_pos = sc_vtb_pos(scp->history, sc_vtb_tail(scp->history),
scp->xsize*scp->ysize);
history_to_screen(scp);
}
/* copy screen-full of saved lines */
static void
history_to_screen(scr_stat *scp)
{
int pos;
int i;
pos = scp->history_pos;
for (i = 1; i <= scp->ysize; ++i) {
pos = sc_vtb_pos(scp->history, pos, -scp->xsize);
sc_vtb_copy(scp->history, pos,
&scp->vtb, scp->xsize*(scp->ysize - i),
scp->xsize);
}
mark_all(scp);
}
static void
copy_history(sc_vtb_t *from, sc_vtb_t *to)
{
int lines;
int cols;
int cols1;
int cols2;
int pos;
int i;
lines = sc_vtb_rows(from);
cols1 = sc_vtb_cols(from);
cols2 = sc_vtb_cols(to);
cols = imin(cols1, cols2);
pos = sc_vtb_tail(from);
for (i = 0; i < lines; ++i) {
sc_vtb_append(from, pos, to, cols);
if (cols < cols2)
sc_vtb_seek(to, sc_vtb_pos(to,
sc_vtb_tail(to),
cols2 - cols));
pos = sc_vtb_pos(from, pos, cols1);
}
}
/* copy cnt of saved lines */
static void
history_to_screen_lines(scr_stat *scp, int cnt)
{
int pos;
int i;
int lines = imin(cnt, scp->ysize);
pos = scp->history_pos;
for (i = 1; i <= lines; ++i) {
pos = sc_vtb_pos(scp->history, pos, -scp->xsize);
sc_vtb_copy(scp->history, pos,
&scp->vtb, scp->xsize*(lines - i),
scp->xsize);
}
mark_all(scp);
}
/* restore the screen by copying from the history buffer */
int
sc_hist_restore(scr_stat *scp)
{
int ret;
if (scp->history_pos != sc_vtb_tail(scp->history)) {
scp->history_pos = sc_vtb_tail(scp->history);
history_to_screen(scp);
ret = 0;
} else {
ret = 1;
}
sc_vtb_seek(scp->history, sc_vtb_pos(scp->history,
sc_vtb_tail(scp->history),
-scp->xsize*scp->ysize));
return ret;
}
