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Message-ID: <F10D23B02E54D011A0AB0020AF9CEFE988F9E5@lynx.ceddec.com>
From: "Town, Brad" <btown AT ceddec DOT com>
To: "'cygwin AT sources DOT redhat DOT com'" <cygwin AT sources DOT redhat DOT com>
Subject: RE: 'clear' does not clear entire screen (affects vim also)
Date: Tue, 14 Nov 2000 09:52:09 -0500
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Attached is a minor patch that uses the screen buffer width rather than the
window width to calculate the number of spaces to clear.

Brad Town


> The trouble appears to be due to the way it calculates how 
> many spaces to
> clear.  I'll look into it and submit a patch.
> 
> Brad Town
> 
> 
> > Problem:  Bottom portion of screen is not cleared by 'clear' 
> > if the visible
> > screen width is less than the actual (buffer) screen width. 
>  This also
> > affects vim because the bottom portion of screen in vim is 
> not cleared
> > before redrawing.  This leaves the existing characters on the 
> > screen in the
> > areas where no next is written (i.e. after the ends of 
> lines and blank
> > lines).
> > 
> > To reproduce the problem:
> > 
> > 1. From any bash shell, resize the window narrower so that 
> a scrollbar
> > appears at the bottom of the screen.
> > 2. vim a file or run 'clear'
> > 
> > Win2000
> > version 1.1.4
> > 
> > Jim Hickey
> > jim_hickey AT hp DOT com


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--- fhandler_console.cc.orig	Thu Nov  2 11:17:39 2000
+++ fhandler_console.cc	Tue Nov 14 09:39:28 2000
@@ -264,6 +264,7 @@ static struct
     SHORT winTop;
     SHORT winBottom;
     COORD dwWinSize;
+    COORD dwBufferSize;
     COORD dwCursorPosition;
     WORD wAttributes;
   } info;
@@ -280,6 +281,7 @@ fhandler_console::fillin_info (void)
       info.winBottom = linfo.srWindow.Bottom;
       info.dwWinSize.Y = 1 + linfo.srWindow.Bottom - linfo.srWindow.Top;
       info.dwWinSize.X = 1 + linfo.srWindow.Right - linfo.srWindow.Left;
+      info.dwBufferSize = linfo.dwSize;
       info.dwCursorPosition = linfo.dwCursorPosition;
       info.wAttributes = linfo.wAttributes;
     }
@@ -650,9 +652,9 @@ fhandler_console::clear_screen (int x1, 
   if (y2 < 0)
     y2 = info.winBottom;
 
-  num = abs (y1 - y2) * info.dwWinSize.X + abs (x1 - x2) + 1;
+  num = abs (y1 - y2) * info.dwBufferSize.X + abs (x1 - x2) + 1;
 
-  if ((y2 * info.dwWinSize.X + x2) > (y1 * info.dwWinSize.X + x1))
+  if ((y2 * info.dwBufferSize.X + x2) > (y1 * info.dwBufferSize.X + x1))
     {
       tlc.X = x1;
       tlc.Y = y1;


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