X-Git-Url: https://ncurses.scripts.mit.edu/?p=ncurses.git;a=blobdiff_plain;f=ncurses%2Fbase%2Flib_newwin.c;h=a6c64beaaf4a1c0efc45fde3cb30164e8c9a4568;hp=6632c77a0668af87fa8ac0a11a7d37fff2156872;hb=b0916ab669030bac5c8590c0d66e36e1b9b34e9b;hpb=f783dbd488409a4b1fb58e993cee2f01484a0ef0

diff --git a/ncurses/base/lib_newwin.c b/ncurses/base/lib_newwin.c
index 6632c77a..a6c64bea 100644
--- a/ncurses/base/lib_newwin.c
+++ b/ncurses/base/lib_newwin.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998-2008,2009 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            *
@@ -43,7 +43,7 @@
 #include <curses.priv.h>
 #include <stddef.h>
 
-MODULE_ID("$Id: lib_newwin.c,v 1.65 2009/11/14 01:12:48 Nicholas.Marriott Exp $")
+MODULE_ID("$Id: lib_newwin.c,v 1.71 2011/05/28 21:32:51 tom Exp $")
 
 #define window_is(name) ((sp)->_##name == win)
 
@@ -141,7 +141,11 @@ NCURSES_SP_NAME(newwin) (NCURSES_SP_DCLx
     T((T_CALLED("newwin(%p, %d,%d,%d,%d)"), (void *) SP_PARM, num_lines, num_columns,
        begy, begx));
 
-    if (begy < 0 || begx < 0 || num_lines < 0 || num_columns < 0)
+    if (begy < 0
+	|| begx < 0
+	|| num_lines < 0
+	|| num_columns < 0
+	|| SP_PARM == 0)
 	returnWin(0);
 
     if (num_lines == 0)
@@ -235,16 +239,21 @@ derwin(WINDOW *orig, int num_lines, int num_columns, int begy, int begx)
 NCURSES_EXPORT(WINDOW *)
 subwin(WINDOW *w, int l, int c, int y, int x)
 {
+    WINDOW *result = 0;
+
     T((T_CALLED("subwin(%p, %d, %d, %d, %d)"), (void *) w, l, c, y, x));
-    T(("parent has begy = %ld, begx = %ld", (long) w->_begy, (long) w->_begx));
+    if (w != 0) {
+	T(("parent has begy = %ld, begx = %ld", (long) w->_begy, (long) w->_begx));
 
-    returnWin(derwin(w, l, c, y - w->_begy, x - w->_begx));
+	result = derwin(w, l, c, y - w->_begy, x - w->_begx);
+    }
+    returnWin(result);
 }
 
 static bool
 dimension_limit(int value)
 {
-    NCURSES_SIZE_T test = value;
+    NCURSES_SIZE_T test = (NCURSES_SIZE_T) value;
     return (test == value && value > 0);
 }
 
@@ -284,13 +293,13 @@ NCURSES_SP_NAME(_nc_makenew) (NCURSES_SP_DCLx
 
     win->_curx = 0;
     win->_cury = 0;
-    win->_maxy = num_lines - 1;
-    win->_maxx = num_columns - 1;
-    win->_begy = begy;
-    win->_begx = begx;
+    win->_maxy = (NCURSES_SIZE_T) (num_lines - 1);
+    win->_maxx = (NCURSES_SIZE_T) (num_columns - 1);
+    win->_begy = (NCURSES_SIZE_T) begy;
+    win->_begx = (NCURSES_SIZE_T) begx;
     win->_yoffset = SP_PARM->_topstolen;
 
-    win->_flags = flags;
+    win->_flags = (short) flags;
     WINDOW_ATTRS(win) = A_NORMAL;
     SetChar(win->_nc_bkgd, BLANK_TEXT, BLANK_ATTR);
 
@@ -311,7 +320,7 @@ NCURSES_SP_NAME(_nc_makenew) (NCURSES_SP_DCLx
     win->_parent = 0;
 
     win->_regtop = 0;
-    win->_regbottom = num_lines - 1;
+    win->_regbottom = (NCURSES_SIZE_T) (num_lines - 1);
 
     win->_pad._pad_y = -1;
     win->_pad._pad_x = -1;
@@ -341,7 +350,7 @@ NCURSES_SP_NAME(_nc_makenew) (NCURSES_SP_DCLx
 	 * So that's how we want ncurses to behave.
 	 */
 	win->_line[i].firstchar = 0;
-	win->_line[i].lastchar = num_columns - 1;
+	win->_line[i].lastchar = (NCURSES_SIZE_T) (num_columns - 1);
 
 	if_USE_SCROLL_HINTS(win->_line[i].oldindex = i);
     }