ncurses 6.0 - patch 20160611

[ncurses.git] / ncurses / base / lib_scroll.c

diff --git a/ncurses/base/lib_scroll.c b/ncurses/base/lib_scroll.c
index f8e16bafa8743cec7264f92db7e9de66aa240743..8684e2519294f12d5c5e90bb10c38d102927ab1f 100644 (file)
--- 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) 1998-2010,2011 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            *
@@ -43,18 +43,22 @@
 
 #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 1.29 2011/10/22 16:34:50 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,
+                 int const top,
+                 int const bottom,
+                 NCURSES_CH_T blank)
 {
     int limit;
     int line;
     int j;
-    size_t to_copy = (size_t) (sizeof(NCURSES_CH_T) * (win->_maxx + 1));
+    size_t to_copy = (sizeof(NCURSES_CH_T) * (size_t) (win->_maxx + 1));
 
-    TR(TRACE_MOVE, ("_nc_scroll_window(%p, %d, %d, %d)", win, n, top, bottom));
+    TR(TRACE_MOVE, ("_nc_scroll_window(%p, %d, %ld, %ld)",
+                   (void *) win, n, (long) top, (long) bottom));
 
     if (top < 0
        || bottom < top
@@ -110,12 +114,28 @@ _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)
 wscrl(WINDOW *win, int n)
 {
-    T((T_CALLED("wscrl(%p,%d)"), win, n));
+    T((T_CALLED("wscrl(%p,%d)"), (void *) win, n));
 
     if (!win || !win->_scroll) {
        TR(TRACE_MOVE, ("...scrollok is false"));