diff options
| author | Miod Vallat <miod@cvs.openbsd.org> | 2004-12-23 21:45:52 +0000 |
|---|---|---|
| committer | Miod Vallat <miod@cvs.openbsd.org> | 2004-12-23 21:45:52 +0000 |
| commit | e9ef699cb9c786d6f4bab43d0342202be888febe (patch) | |
| tree | 31914a45e2041a1b7edd63b2733e21a8bef3f3ef /sys | |
| parent | 5f346652ef082dcb255732a23cd06e4036174b6a (diff) | |
Reliability fix, from NetBSD:
When moving the cursor down, only scroll up if cursor is exactly at
bottom of scroll region; don't scroll if below scroll region.
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/dev/wscons/wsemul_vt100.c | 43 |
1 files changed, 25 insertions, 18 deletions
diff --git a/sys/dev/wscons/wsemul_vt100.c b/sys/dev/wscons/wsemul_vt100.c index 82fd2585f83..d4d02ae57ef 100644 --- a/sys/dev/wscons/wsemul_vt100.c +++ b/sys/dev/wscons/wsemul_vt100.c @@ -1,4 +1,4 @@ -/* $OpenBSD: wsemul_vt100.c,v 1.9 2004/04/02 04:39:51 deraadt Exp $ */ +/* $OpenBSD: wsemul_vt100.c,v 1.10 2004/12/23 21:45:51 miod Exp $ */ /* $NetBSD: wsemul_vt100.c,v 1.13 2000/04/28 21:56:16 mycroft Exp $ */ /* @@ -68,8 +68,9 @@ void wsemul_vt100_output_normal(struct wsemul_vt100_emuldata *, u_char, int); void wsemul_vt100_output_c0c1(struct wsemul_vt100_emuldata *, u_char, int); +void wsemul_vt100_nextline(struct wsemul_vt100_emuldata *); typedef u_int vt100_handler(struct wsemul_vt100_emuldata *, u_char); -static vt100_handler +vt100_handler wsemul_vt100_output_esc, wsemul_vt100_output_csi, wsemul_vt100_output_scs94, @@ -298,6 +299,25 @@ wsemul_vt100_reset(edp) } /* + * Move the cursor to the next line if possible. If the cursor is at + * the bottom of the scroll area, then scroll it up. If the cursor is + * at the bottom of the screen then don't move it down. + */ +void +wsemul_vt100_nextline(struct wsemul_vt100_emuldata *edp) +{ + if (ROWS_BELOW == 0) { + /* Bottom of the scroll region. */ + wsemul_vt100_scrollup(edp, 1); + } else { + if ((edp->crow+1) < edp->nrows) + /* Cursor not at the bottom of the screen. */ + edp->crow++; + CHECK_DW; + } +} + +/* * now all the state machine bits */ @@ -311,11 +331,7 @@ wsemul_vt100_output_normal(edp, c, kernel) if ((edp->flags & (VTFL_LASTCHAR | VTFL_DECAWM)) == (VTFL_LASTCHAR | VTFL_DECAWM)) { - if (ROWS_BELOW > 0) { - edp->crow++; - CHECK_DW; - } else - wsemul_vt100_scrollup(edp, 1); + wsemul_vt100_nextline(edp); edp->ccol = 0; edp->flags &= ~VTFL_LASTCHAR; } @@ -426,11 +442,7 @@ wsemul_vt100_output_c0c1(edp, c, kernel) case ASCII_LF: case ASCII_VT: case ASCII_FF: - if (ROWS_BELOW > 0) { - edp->crow++; - CHECK_DW; - } else - wsemul_vt100_scrollup(edp, 1); + wsemul_vt100_nextline(edp); break; } } @@ -486,12 +498,7 @@ wsemul_vt100_output_esc(edp, c) edp->ccol = 0; /* FALLTHRU */ case 'D': /* IND */ - if (ROWS_BELOW > 0) { - edp->crow++; - CHECK_DW; - break; - } - wsemul_vt100_scrollup(edp, 1); + wsemul_vt100_nextline(edp); break; case 'H': /* HTS */ KASSERT(edp->tabs != 0); |