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locks; strict;
comment	@# @;


1.3
date	2002.02.11.18.30.22;	author fredb;	state Exp;
branches;
next	1.2;

1.2
date	2002.02.11.18.24.55;	author fredb;	state Exp;
branches;
next	1.1;

1.1
date	2002.02.10.22.49.55;	author fredb;	state Exp;
branches;
next	;


desc
@@


1.3
log
@Programs that follow Digital's recommendations will follow ESC(0 -- to
load the DEC Special Graphics (VT line draw) characters into graphics set
GS0 -- with lock shift 0, aka LS0, aka SO, aka ^0 -- to then enable GS0.
Since GS0 is the default, the full procedure is really only necessary when
displaying line draw and alphanumeric characters on the same line. With the
last patch to enable line draw characters, ESC(0 was always taken to mean
ASCII SI (shift in), and ^0 was always taken to to mean SO (shift out),
so for programs that did the right thing (e.g. "pstree"), "dt" was simply
setting, then unsetting, the alternate character set attribute, causing
the desired line draw characters never to be displayed.

To deal with that, introduce a layer of abstraction, such that ESC(0
and friends now only set per-VT variables, rather than directly set the
attribute. Initialize these variables so that SO and SI, taken alone, will
do the expected thing, and extend the state machine so that a changed GS0
will become active at the next carriage return, or immediately if an LS0
was already seen on that line (all very much like a real VT).

Bump version to dt-1.1.7nb2.
@
text
@$NetBSD$

--- vt.h.orig	Mon Feb 11 11:13:44 2002
+++ vt.h
@@@@ -5,7 +5,7 @@@@
  */
 
 #define VT_MAXVT	9
-#define	VT_MAXCOLS	132
+#define	VT_MAXCOLS	224
 #define	VT_MAXROWS	100
 #define	VT_POOLSIZE	(VT_MAXVT * (VT_MAXROWS + 1))
 
@@@@ -20,6 +20,7 @@@@
 #define T_REVERSE	0x04
 #define T_SELECTED	0x08
 #define T_INSERT	0x10
+#define T_LINEDRAW	0x20
 
 /* Cursor types */
 #define C_BLOCK		0x01
@@@@ -49,6 +50,10 @@@@
 #define	SETBG(x,c)	((x) = ((x) & 0x0F) | ((c) << 4))
 #define	SETCOLOR(x,f,b)	((x) = (f) | ((b) << 4))
 
+/* Character sets */
+#define S_ASCII		0x00	/* ASCII Graphics (normal)	*/
+#define S_LINEDRAW	0x01	/* DEC Special Graphics		*/
+
 struct vt_s {
 	/* Scrollback information */
 	int     line[VT_POOLSIZE];	/* Lines in the scrollback pool	 */
@@@@ -87,6 +92,12 @@@@
 	int     pars[VT_MAXPARS];	/* VT100 parameters		 */
 	int     ques;		/* If ? in VT100 string		 */
 	u_int   tab_stop[5];	/* Bit field for tab stops	 */
+
+	/* Graphics set information */
+	int	gset0;		/* Character set loaded into GS0 */
+	int	gset0changed;	/* GS0 loaded, but not active	 */
+	int	gset0mapped;	/* GS0 loaded and active	 */
+	int	gset1;		/* Character set loaded into GS1 */
 };
 
 extern struct vt_s vt[VT_MAXVT];
@


1.2
log
@Work around an old bug that causes the display to become corrupted when
the actual, display line width exceeds the size of the array allotted for
it, by increasing the size of said array to 224 characters. This is good to
about 1350 pixels horizontal with the small font, or nearly 1800 with the
large font.
@
text
@d1 1
a1 1
$NetBSD: patch-ac,v 1.1 2002/02/10 22:49:55 fredb Exp $
d3 2
a4 2
--- vt.h.orig	Sun Jun  9 07:32:33 1996
+++ vt.h	Thu Feb  7 09:12:59 2002
d18 1
a18 1
+#define T_G0		0x20
d22 24
@


1.1
log
@Boy, do I suck. Allen Briggs forwarded these patches from
Steven Carlson <stevec@@accessone.com>, to do vt line draw
characters, to me over *two* *years* ago!
@
text
@d1 1
a1 1
$NetBSD$
d5 9
@