X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/27704fe4c77e63607f86d8d3399b72a14b1ff5ae..31cef89cb428866f787983e68246030321893df4:/usr/src/cmd/ex/ex_v.c

diff --git a/usr/src/cmd/ex/ex_v.c b/usr/src/cmd/ex/ex_v.c
index c42808b9f2..be06ec5a7e 100644
--- a/usr/src/cmd/ex/ex_v.c
+++ b/usr/src/cmd/ex/ex_v.c
@@ -1,4 +1,5 @@
-/* Copyright (c) 1979 Regents of the University of California */
+/* Copyright (c) 1980 Regents of the University of California */
+static char *sccsid = "@(#)ex_v.c	6.1 10/18/80";
 #include "ex.h"
 #include "ex_re.h"
 #include "ex_tty.h"
@@ -53,7 +54,7 @@ oop()
 {
 	register char *ic;
 	char atube[TUBESIZE + LBSIZE];
-	register int f;
+	register ttymode f;
 
 	ovbeg();
 	if (peekchar() == '/') {
@@ -128,7 +129,7 @@ ovbeg()
 }
 
 ovend(f)
-	int f;
+	ttymode f;
 {
 
 	splitw++;
@@ -153,7 +154,7 @@ vop()
 {
 	register int c;
 	char atube[TUBESIZE + LBSIZE];
-	register int f;
+	register ttymode f;
 
 	if (!CA && UP == NOSTR) {
 		if (initev) {
@@ -175,6 +176,11 @@ toopen:
 			goto toopen;
 		error("Visual requires clear screen capability");
 	}
+	if (NS && !SF) {
+		if (initev)
+			goto toopen;
+		error("Visual requires scrolling");
+	}
 	ovbeg();
 	bastate = VISUAL;
 	c = 0;
@@ -258,6 +264,8 @@ undvis()
 	undap1 = one;
 	undap2 = dol + 1;
 	undkind = UNDALL;
+	if (undadot <= zero || undadot > dol)
+		undadot = zero+1;
 }
 
 /*
@@ -318,11 +326,11 @@ vok(atube)
 	vtube0 = atube;
 	vclrbyte(atube, WCOLS * (WECHO - ZERO + 1));
 	for (i = 0; i < ZERO; i++)
-		vtube[i] = (char *) -20000;
+		vtube[i] = (char *) 0;
 	for (; i <= WECHO; i++)
 		vtube[i] = atube, atube += WCOLS;
 	for (; i < TUBELINES; i++)
-		vtube[i] = (char *) -20000;
+		vtube[i] = (char *) 0;
 	vutmp = atube;
 	vundkind = VNONE;
 	vUNDdot = 0;