$NetBSD: patch-ad,v 1.2 2002/02/11 18:30:23 fredb Exp $

--- vt.c.orig	Fri May 24 10:13:52 1996
+++ vt.c
@@ -748,6 +748,9 @@
 	register int line, i;
 
 	if (v->state == ESnormal && ch >= ' ' && ch < 256) {
+		if ( (v->attr & T_LINEDRAW) && ch >= 'a' && ch <= 'z')
+			ch -= 95;
+
 		if (v->hanging_cursor) {
 			v->x = 0;
 			movecursordown(v);
@@ -796,13 +799,38 @@
 		v->hanging_cursor = 0;	/* XXX Is this right?	 */
 		return;
 	case 13:
+		/*
+		 * This is a hack! Do what I mean: after setting GS0,
+		 * activate GS0 for next line, but don't just activate
+		 * GS0 for every new line.
+		 */
+		if (v->gset0changed) {
+			if (v->gset0 == S_ASCII)
+				v->attr &= ~T_LINEDRAW;
+			else
+				v->attr |= T_LINEDRAW;
+			v->gset0changed = 0;
+			v->gset0mapped = 0;
+		}
 		v->x = 0;	/* Carriage return (^M)	 */
 		v->hanging_cursor = 0;
 		return;
 	case 14:
-		return;		/* Alternate font (^N)	 */
+		if (v->gset1 == S_ASCII)
+			v->attr &= ~T_LINEDRAW;
+		else
+			v->attr |= T_LINEDRAW;
+		return;		/* Lock Shift 1 (^N)  */
+		v->gset0changed = 0;
+		v->gset0mapped = 0;
 	case 15:
-		return;		/* Normal font (^O)	 */
+		if (v->gset0 == S_ASCII)
+			v->attr &= ~T_LINEDRAW;
+		else
+			v->attr |= T_LINEDRAW;
+		v->gset0changed = 1;	/* to clear map bit at EOL	 */
+		v->gset0mapped = 1;
+		return;		/* Lock Shift 0 (^O)  */
 	case 24:		/* (^X)			 */
 	case 26:
 		v->state = ESnormal;	/* (^Z)			 */
@@ -1070,36 +1098,38 @@
 		break;
 	case ESsetG0:
 		if (ch == '0') {
-			/* Set graphics character set */
-		} else
-			if (ch == 'B') {
-				/* Set normal character set */
-			} else
-				if (ch == 'U') {
-					/* Set null character set */
-				} else
-					if (ch == 'K') {
-						/* Set user-defined character
-						 * set */
-					}
-		/* If currently G0, then make active set */
+			v->gset0 = S_LINEDRAW;
+			if (v->gset0mapped)
+				/*
+				 * Activate immediately. We'll still mark it
+				 * changed, so the mapped bit will get cleared
+				 * for the next line.
+				 */
+				v->attr |= T_LINEDRAW;
+			v->gset0changed = 1;
+		} else if (ch == 'B') {
+			v->gset0 = S_ASCII;
+			if (v->gset0mapped)
+				/*
+				 * Activate immediately. We'll still mark it
+				 * changed, so the mapped bit will get cleared
+				 * for the next line.
+				 */
+				v->attr &= ~T_LINEDRAW;
+			v->gset0changed = 1;
+		}
 		v->state = ESnormal;
 		break;
+	/*
+	 * Not very useful. Typically, G1 would be changed to one
+	 * of the other character sets, which we don't support.
+	 */
 	case ESsetG1:
 		if (ch == '0') {
-			/* Set graphics character set */
-		} else
-			if (ch == 'B') {
-				/* Set normal character set */
-			} else
-				if (ch == 'U') {
-					/* Set null character set */
-				} else
-					if (ch == 'K') {
-						/* Set user-defined character
-						 * set */
-					}
-		/* If currently G1, then make active set */
+			v->gset1 = S_LINEDRAW;
+		} else if (ch == 'B') {
+			v->gset1 = S_ASCII;
+		}
 		v->state = ESnormal;
 		break;
 	default:
@@ -1187,6 +1217,10 @@
 		v->tab_stop[3] = 0x01010101;
 		v->tab_stop[4] = 0x01010101;
 		v->copying = 0;
+		v->gset0 = S_ASCII;
+		v->gset0changed = 0;
+		v->gset0mapped = 0;
+		v->gset1 = S_LINEDRAW;
 	}
 }