1/* 2 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24/* @test 25 * @bug 4175312 26 * @summary Test StringReader.skip with negative param 27 */ 28 29import java.io.*; 30 31public class Skip { 32 public static void main( String argv[] ) throws Exception { 33 StringReader in = new StringReader("1234567"); 34 35 // Skip forward and read 36 if (in.skip(3) != 3) 37 throw new RuntimeException("skip(3) failed"); 38 if (in.read() != '4') 39 throw new RuntimeException("post skip read failure"); 40 41 // Skip backward and read 42 if (in.skip(-2) != -2) 43 throw new RuntimeException("skip(-2) failed"); 44 if (in.read() != '3') 45 throw new RuntimeException("read failed after negative skip"); 46 47 // Attempt to skip backward past the beginning and read 48 if (in.skip(-6) != -3) 49 throw new RuntimeException("skip(-6) failed"); 50 if (in.read() != '1') 51 throw new RuntimeException("read after skip past beginning failed"); 52 53 // Skip beyond the end 54 if (in.skip(30) != 6) 55 throw new RuntimeException("skip(30) failed"); 56 if (in.read() != -1) 57 throw new RuntimeException("read at EOF failed"); 58 59 // Test after reaching end of string 60 if (in.skip(30) != 0) 61 throw new RuntimeException("skip(30) failed"); 62 if (in.skip(-30) != 0) 63 throw new RuntimeException("skip(30) failed"); 64 } 65} 66