diff options
Diffstat (limited to 'drivers/video/console/vgacon.c')
| -rw-r--r-- | drivers/video/console/vgacon.c | 39 |
1 files changed, 19 insertions, 20 deletions
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index 6df29a62d72..448d209a0bf 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -239,8 +239,7 @@ static void vgacon_restore_screen(struct vc_data *c) static int vgacon_scrolldelta(struct vc_data *c, int lines) { - int start, end, count, soff, diff; - void *d, *s; + int start, end, count, soff; if (!lines) { c->vc_visible_origin = c->vc_origin; @@ -287,29 +286,29 @@ static int vgacon_scrolldelta(struct vc_data *c, int lines) if (count > c->vc_rows) count = c->vc_rows; - diff = c->vc_rows - count; + if (count) { + int copysize; - d = (void *) c->vc_origin; - s = (void *) c->vc_screenbuf; + int diff = c->vc_rows - count; + void *d = (void *) c->vc_origin; + void *s = (void *) c->vc_screenbuf; - while (count--) { - scr_memcpyw(d, vgacon_scrollback + soff, c->vc_size_row); - d += c->vc_size_row; - soff += c->vc_size_row; + count *= c->vc_size_row; + /* how much memory to end of buffer left? */ + copysize = min(count, vgacon_scrollback_size - soff); + scr_memcpyw(d, vgacon_scrollback + soff, copysize); + d += copysize; + count -= copysize; - if (soff >= vgacon_scrollback_size) - soff = 0; - } + if (count) { + scr_memcpyw(d, vgacon_scrollback, count); + d += count; + } - if (diff == c->vc_rows) { + if (diff) + scr_memcpyw(d, s, diff * c->vc_size_row); + } else vgacon_cursor(c, CM_MOVE); - } else { - while (diff--) { - scr_memcpyw(d, s, c->vc_size_row); - d += c->vc_size_row; - s += c->vc_size_row; - } - } return 1; } |