X-Git-Url: http://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=test%2Fmovewindow.c;h=612cb8823cb75cbabb200f2f9701654a5a72d1e2;hp=b855942832c7ed97ab19f688e181b19a7042dc51;hb=1c551ea75ea57f9186fbe8d79674ac85baa4d358;hpb=0573f2d712e4b5cb2a02a3fe52d513843d536b34

diff --git a/test/movewindow.c b/test/movewindow.c
index b8559428..612cb882 100644
--- a/test/movewindow.c
+++ b/test/movewindow.c
@@ -26,7 +26,7 @@
  * authorization.                                                           *
  ****************************************************************************/
 /*
- * $Id: movewindow.c,v 1.36 2012/09/01 23:54:00 tom Exp $
+ * $Id: movewindow.c,v 1.38 2012/12/15 18:36:40 tom Exp $
  *
  * Demonstrate move functions for windows and derived windows from the curses
  * library.
@@ -79,6 +79,14 @@ static void tail_line(CONST_FMT char *fmt,...) GCC_PRINTFLIKE(1, 2);
 static unsigned num_windows;
 static FRAME *all_windows;
 
+static void
+failed(const char *s)
+{
+    perror(s);
+    endwin();
+    ExitProgram(EXIT_FAILURE);
+}
+
 static void
 message(int lineno, CONST_FMT char *fmt, va_list argp)
 {
@@ -210,8 +218,16 @@ selectcell(WINDOW *parent,
 	    res.x = ulj + j;
 	    return (&res);
 	}
-	i %= si;
-	j %= sj;
+
+	if (si <= 0)
+	    i = 0;
+	else
+	    i %= si;
+
+	if (sj <= 0)
+	    j = 0;
+	else
+	    j %= sj;
 
 	/*
 	 * If the caller can handle continuous movement, return the result.
@@ -305,6 +321,8 @@ add_window(WINDOW *parent, WINDOW *child)
     keypad(child, TRUE);
     if (need > have) {
 	all_windows = typeRealloc(FRAME, need, all_windows);
+	if (!all_windows)
+	    failed("add_window");
     }
     all_windows[num_windows].parent = parent;
     all_windows[num_windows].child = child;