ncurses 5.6 - patch 20080419

[ncurses.git] / ncurses / tty / tty_update.c

diff --git a/ncurses/tty/tty_update.c b/ncurses/tty/tty_update.c
index 33c79c7c0d5118d6c756abefe562a4a25e30c72a..866681369a108ab989a3b45ce3e4dea84ddb7bbd 100644 (file)
--- a/ncurses/tty/tty_update.c
+++ b/ncurses/tty/tty_update.c
@@ -74,7 +74,7 @@
 #include <ctype.h>
 #include <term.h>
 
 #include <ctype.h>
 #include <term.h>
 

-MODULE_ID("$Id: tty_update.c,v 1.242 2007/09/29 20:37:13 tom Exp $")
+MODULE_ID("$Id: tty_update.c,v 1.243 2007/10/13 20:03:32 tom Exp $")

 
 /*
  * This define controls the line-breakout optimization.  Every once in a
 
 /*
  * This define controls the line-breakout optimization.  Every once in a


@@ -624,6 +624,10 @@ doupdate(void)
 
     T((T_CALLED("doupdate()")));
 
 
     T((T_CALLED("doupdate()")));
 

+    if (curscr == 0
+       || newscr == 0)
+       returnCode(ERR);
+

 #ifdef TRACE
     if (USE_TRACEF(TRACE_UPDATE)) {
        if (curscr->_clear)
 #ifdef TRACE
     if (USE_TRACEF(TRACE_UPDATE)) {
        if (curscr->_clear)