diff options
Diffstat (limited to 'src/screen.c')
| -rw-r--r-- | src/screen.c | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/src/screen.c b/src/screen.c index 3681eb4..86a29c0 100644 --- a/src/screen.c +++ b/src/screen.c @@ -810,13 +810,35 @@ static void runes_screen_scroll_down(RunesTerm *t, int count) } } else { - runes_screen_ensure_capacity(t, scr->grid->row_count + count); - for (i = 0; i < count; ++i) { - row = runes_screen_row_at(t, i + scr->grid->max.row); - row->cells = calloc(scr->grid->max.col, sizeof(struct runes_cell)); + int scrollback = t->config.scrollback_length; + + if (scr->grid->row_count + count > scrollback) { + int overflow = scr->grid->row_count + count - scrollback; + + runes_screen_ensure_capacity(t, scrollback); + for (i = 0; i < overflow; ++i) { + free(scr->grid->rows[i].cells); + } + memmove( + &scr->grid->rows[0], &scr->grid->rows[overflow], + (scrollback - overflow) * sizeof(struct runes_row)); + for (i = scrollback - count; i < scrollback; ++i) { + scr->grid->rows[i].cells = calloc( + scr->grid->max.col, sizeof(struct runes_cell)); + } + scr->grid->row_count = scrollback; + scr->grid->row_top = scrollback - scr->grid->max.row; + } + else { + runes_screen_ensure_capacity(t, scr->grid->row_count + count); + for (i = 0; i < count; ++i) { + row = runes_screen_row_at(t, i + scr->grid->max.row); + row->cells = calloc( + scr->grid->max.col, sizeof(struct runes_cell)); + } + scr->grid->row_count += count; + scr->grid->row_top += count; } - scr->grid->row_count += count; - scr->grid->row_top += count; } } |