ncurses 5.9 - patch 20130119
[ncurses.git] / ncurses / base / lib_instr.c
index 3fb29490ad0638f1025a6271ac22c516122cdef0..5677b57b8313827b3db3ea80cc1194415e97169b 100644 (file)
@@ -1,5 +1,5 @@
 /****************************************************************************
- * Copyright (c) 1998-2005,2007 Free Software Foundation, Inc.              *
+ * Copyright (c) 1998-2011,2013 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            *
 
 #include <curses.priv.h>
 
-MODULE_ID("$Id: lib_instr.c,v 1.16 2007/07/21 20:18:10 tom Exp $")
+MODULE_ID("$Id: lib_instr.c,v 1.20 2013/01/20 01:58:13 tom Exp $")
 
 NCURSES_EXPORT(int)
 winnstr(WINDOW *win, char *str, int n)
 {
     int i = 0, row, col;
 
-    T((T_CALLED("winnstr(%p,%p,%d)"), win, str, n));
+    T((T_CALLED("winnstr(%p,%p,%d)"), (void *) win, str, n));
 
     if (!str)
        returnCode(0);
@@ -78,19 +78,23 @@ winnstr(WINDOW *win, char *str, int n)
                    if (getcchar(cell, wch, &attrs, &pair, 0) == OK) {
 
                        init_mb(state);
-                       n3 = wcstombs(0, wch, 0);
-                       if (isEILSEQ(n3) || (n3 == 0)) {
-                           ;
-                       } else if ((int) (n3 + i) > n) {
-                           done = TRUE;
-                       } else if ((tmp = typeCalloc(char, n3 + 10)) == 0) {
-                           done = TRUE;
-                       } else {
-                           init_mb(state);
-                           wcstombs(tmp, wch, n3);
-                           for (i3 = 0; i3 < n3; ++i3)
-                               str[i++] = tmp[i3];
-                           free(tmp);
+                       n3 = wcstombs(0, wch, (size_t) 0);
+                       if (!isEILSEQ(n3) && (n3 != 0)) {
+                           size_t need = n3 + 10 + (size_t) i;
+                           int have = (int) n3 + i;
+
+                           /* check for loop-done as well as overflow */
+                           if (have > n || (int) need <= 0) {
+                               done = TRUE;
+                           } else if ((tmp = typeCalloc(char, need)) == 0) {
+                               done = TRUE;
+                           } else {
+                               init_mb(state);
+                               wcstombs(tmp, wch, n3);
+                               for (i3 = 0; i3 < n3; ++i3)
+                                   str[i++] = tmp[i3];
+                               free(tmp);
+                           }
                        }
                    }
                    free(wch);