X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=ncurses%2Fbase%2Flib_scroll.c;fp=ncurses%2Fbase%2Flib_scroll.c;h=ec462c9e077351289d50c146bc94076270183773;hp=f8e16bafa8743cec7264f92db7e9de66aa240743;hb=55ccd2b959766810cf7db8d1c4462f338ce0afc8;hpb=a8987e73ec254703634802b4f7ee30d3a485524d

diff --git a/ncurses/base/lib_scroll.c b/ncurses/base/lib_scroll.c
index f8e16baf..ec462c9e 100644
--- a/ncurses/base/lib_scroll.c
+++ b/ncurses/base/lib_scroll.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998,2001,2003 Free Software Foundation, Inc.              *
+ * Copyright (c) 1998-2003,2004 Free Software Foundation, Inc.              *
  *                                                                          *
  * Permission is hereby granted, free of charge, to any person obtaining a  *
  * copy of this software and associated documentation files (the            *
@@ -43,11 +43,14 @@
 
 #include <curses.priv.h>
 
-MODULE_ID("$Id: lib_scroll.c,v 1.24 2003/07/26 23:25:26 tom Exp $")
+MODULE_ID("$Id: lib_scroll.c,v 1.25 2004/12/11 18:28:51 tom Exp $")
 
 NCURSES_EXPORT(void)
-_nc_scroll_window(WINDOW *win, int const n, NCURSES_SIZE_T const top,
-		  NCURSES_SIZE_T const bottom, NCURSES_CH_T blank)
+_nc_scroll_window(WINDOW *win,
+		  int const n,
+		  NCURSES_SIZE_T const top,
+		  NCURSES_SIZE_T const bottom,
+		  NCURSES_CH_T blank)
 {
     int limit;
     int line;
@@ -110,6 +113,22 @@ _nc_scroll_window(WINDOW *win, int const n, NCURSES_SIZE_T const top,
 	}
     }
     touchline(win, top, bottom - top + 1);
+
+    if_WIDEC({
+	if (WINDOW_EXT(win, addch_used) != 0) {
+	    int next = WINDOW_EXT(win, addch_y) + n;
+	    if (next < 0 || next > win->_maxy) {
+		TR(TRACE_VIRTPUT,
+		   ("Alert discarded multibyte on scroll"));
+		WINDOW_EXT(win, addch_y) = 0;
+	    } else {
+		TR(TRACE_VIRTPUT, ("scrolled working position to %d,%d",
+				   WINDOW_EXT(win, addch_y),
+				   WINDOW_EXT(win, addch_x)));
+		WINDOW_EXT(win, addch_y) = next;
+	    }
+	}
+    })
 }
 
 NCURSES_EXPORT(int)