2 files changed, 23 insertions, 56 deletions

diff --git a/winsup/cygwin/fhandler.h b/winsup/cygwin/fhandler.h
index 6deae969e..86c62d698 100644
--- a/winsup/cygwin/fhandler.h
+++ b/winsup/cygwin/fhandler.h
@@ -1362,7 +1362,7 @@ class dev_console
   int set_cl_x (cltype);
   int set_cl_y (cltype);
   bool fillin (HANDLE);
-  bool __reg3 scroll_window (HANDLE, int, int, int, int);
+  bool __reg3 clear_should_scroll (HANDLE, int, int, int, int);
   void __reg3 scroll_buffer (HANDLE, int, int, int, int, int, int);
   void __reg3 clear_screen (HANDLE, int, int, int, int);
   void __reg3 save_restore (HANDLE, char);
diff --git a/winsup/cygwin/fhandler_console.cc b/winsup/cygwin/fhandler_console.cc
index 72e85320a..25f2494d7 100644
--- a/winsup/cygwin/fhandler_console.cc
+++ b/winsup/cygwin/fhandler_console.cc
@@ -1199,63 +1199,11 @@ dev_console::set_cl_y (cltype y)
 }
 
 bool
-dev_console::scroll_window (HANDLE h, int x1, int y1, int x2, int y2)
+dev_console::clear_should_scroll (HANDLE h, int x1, int y1, int x2, int y2)
 {
   if (save_buf || x1 != 0 || x2 != dwWinSize.X - 1 || y1 != b.srWindow.Top
       || y2 != b.srWindow.Bottom || b.dwSize.Y <= dwWinSize.Y)
     return false;
-
-  SMALL_RECT sr;
-  int toscroll = dwEnd.Y - b.srWindow.Top + 1;
-  sr.Left = sr.Right = dwEnd.X = 0;
-
-  if (b.srWindow.Bottom + toscroll >= b.dwSize.Y)
-    {
-      /* So we're at the end of the buffer and scrolling the console window
-	 would move us beyond the buffer.  What we do here is to scroll the
-	 console buffer upward by just as much so that the current last line
-	 becomes the last line just prior to the first window line.  That
-	 keeps the end of the console buffer intact, as desired.
-
-	 Since we're moving the console buffer under the console window in
-	 this case, we must not move the console window. */
-      SMALL_RECT br;
-      COORD dest;
-      CHAR_INFO fill;
-
-      br.Left = 0;
-      br.Top = dwEnd.Y - b.srWindow.Top + 1;
-      br.Right = b.dwSize.X - 1;
-      br.Bottom = b.dwSize.Y - 1;
-      dest.X = dest.Y = 0;
-      fill.Char.AsciiChar = ' ';
-      fill.Attributes = current_win32_attr;
-      ScrollConsoleScreenBuffer (h, &br, NULL, dest, &fill);
-      /* Fix dwEnd to reflect the new cursor line (minus 1 to take the
-	 increment a few lines later into account) */
-      dwEnd.Y = b.dwCursorPosition.Y - 1;
-    }
-  else
-    {
-      /* The reminder of the console buffer is big enough to simply move
-         the console window.  We have to set the cursor first, otherwise
-	 the scroll bars will not be corrected.  */
-      SetConsoleCursorPosition (h, dwEnd);
-      /* If we scroll backwards, setting the cursor position will scroll
-         the console window up so that the cursor is at the bottom.  Correct
-	 the action by moving the window down again so the cursor is one line
-	 above the new window position. */
-      if (toscroll < 0)
-	toscroll = b.srWindow.Bottom - b.srWindow.Top;
-      /* Move the window accordingly. */
-      sr.Top = sr.Bottom = toscroll;
-      SetConsoleWindowInfo (h, FALSE, &sr);
-    }
-  /* Eventually set cursor to new end position at the top of the window. */
-  dwEnd.Y++;
-  SetConsoleCursorPosition (h, dwEnd);
-  /* Fix up console buffer info. */
-  fillin (h);
   return true;
 }
 
@@ -1287,8 +1235,27 @@ fhandler_console::clear_screen (cltype xc1, cltype yc1, cltype xc2, cltype yc2)
 
   /* Detect special case - scroll the screen if we have a buffer in order to
      preserve the buffer. */
-  if (!con.scroll_window (h, x1, y1, x2, y2))
-    con.clear_screen (h, x1, y1, x2, y2);
+  if (!con.clear_should_scroll (h, x1, y1, x2, y2))
+    {
+      con.clear_screen (h, x1, y1, x2, y2);
+      return;
+    }
+
+  int xpos, ypos;
+  DWORD done;
+  cursor_get(&xpos, &ypos);
+  cursor_set(false, 0, con.b.dwSize.Y - 1);
+
+  for (int i = 0; i < con.dwWinSize.Y; i += done)
+    {
+      if (!WriteConsoleW (h, L"\n", 1, &done, 0))
+        {
+	  __seterrno ();
+	  break;
+	}
+    }
+
+  cursor_set(false, xpos, ypos);
 }
 
 void __reg3