natThrowable.cc (fillInStackTrace): Check for zero return from backtrace().

2000-07-19  Jeff Sturm  <jeff.sturm@appnet.com>

	* java/lang/natThrowable.cc (fillInStackTrace): Check for
	zero return from backtrace().

From-SVN: r35135

libjava/ChangeLog

+2000-07-19  Jeff Sturm  <jeff.sturm@appnet.com>
+
+	* java/lang/natThrowable.cc (fillInStackTrace): Check for
+	zero return from backtrace().
+
 2000-07-15  Bryce McKinlay  <bryce@albatross.co.nz>
 
 	* java/awt/EventQueue.java (invokeAndWait): Call postEvent() within

libjava/java/lang/natThrowable.cc

@@ -61,9 +61,12 @@ java::lang::Throwable::fillInStackTrace (void)
   int n = backtrace (p, 128) - 1;  
 #endif
 
-  // ???  Might this cause a problem if the byte array isn't aligned?
-  stackTrace = JvNewByteArray (n * sizeof p[0]);
-  memcpy (elements (stackTrace), p+1, (n * sizeof p[0]));
+  if (n > 0)
+    {
+      // ???  Might this cause a problem if the byte array isn't aligned?
+      stackTrace = JvNewByteArray (n * sizeof p[0]);
+      memcpy (elements (stackTrace), p+1, (n * sizeof p[0]));
+    }
 
 #endif