1 /* 2 * Copyright (c) 1999, 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 4151072 26 * @summary Ensure that BufferedReader's methods handle the new line character 27 * following the carriage return correctly after a readLine 28 * operation that resulted in reading a line terminated by a 29 * carriage return (\r). 30 */ 31 import java.io.*; 32 33 public class ReadLine { 34 main(String[] args)35 public static void main(String[] args) throws IOException { 36 // Make sure that the reader does not wait for additional characters to 37 // be read after reading a new line. 38 BufferedReader reader; 39 String[][] strings = { 40 {"CR/LF\r\n", "CR/LF"}, 41 {"LF-Only\n", "LF-Only"}, 42 {"CR-Only\r", "CR-Only"}, 43 {"CR/LF line\r\nMore data", "More data"} 44 }; 45 46 // test 0 "CR/LF\r\n" 47 // test 1 "LF-Only\n" 48 // test 2 "CR-Only\r" 49 for (int i = 0; i < 3; i++) { 50 reader = new BufferedReader(new 51 BoundedReader(strings[i][0]), strings[i][0].length()); 52 if (!reader.readLine().equals(strings[i][1])) 53 throw new RuntimeException("Read incorrect text"); 54 } 55 56 57 // Now test the mark and reset operations. Consider two cases. 58 // 1. For lines ending with CR only. 59 markResetTest("Lot of textual data\rMore textual data\n", 60 "More textual data"); 61 62 // 2. Now for lines ending with CR/LF 63 markResetTest("Lot of textual data\r\nMore textual data\n", 64 "More textual data"); 65 66 // 3. Now for lines ending with LF only 67 markResetTest("Lot of textual data\nMore textual data\n", 68 "More textual data"); 69 70 // Need to ensure behavior of read() after a readLine() read of a CR/LF 71 // terminated line. 72 // 1. For lines ending with CR/LF only. 73 74 // uses "CR/LF line\r\nMore data" 75 reader = new BufferedReader(new 76 BoundedReader(strings[3][0]), strings[3][0].length()); 77 reader.readLine(); 78 if (reader.read() != 'M') 79 throw new RuntimeException("Read() failed"); 80 81 82 // Need to ensure that a read(char[], int, int) following a readLine() 83 // read of a CR/LF terminated line behaves correctly. 84 85 // uses "CR/LF line\r\nMore data" 86 reader = new BufferedReader(new 87 BoundedReader(strings[3][0]), strings[3][0].length()); 88 reader.readLine(); 89 90 char[] buf = new char[9]; 91 reader.read(buf, 0, 9); 92 String newStr = new String(buf); 93 if (!newStr.equals(strings[3][1])) 94 throw new RuntimeException("Read(char[],int,int) failed"); 95 } 96 markResetTest(String inputStr, String resetStr)97 static void markResetTest(String inputStr, String resetStr) 98 throws IOException { 99 BufferedReader reader = new BufferedReader(new 100 BoundedReader(inputStr), inputStr.length()); 101 System.out.println("> " + reader.readLine()); 102 reader.mark(30); 103 System.out.println("......Marking stream ....."); 104 String str = reader.readLine(); 105 System.out.println("> " + str); 106 reader.reset(); 107 String newStr = reader.readLine(); 108 System.out.println("reset> " + newStr); 109 110 // Make sure that the reset point was set correctly. 111 if (!newStr.equals(resetStr)) 112 throw new RuntimeException("Mark/Reset failed"); 113 } 114 115 116 private static class BoundedReader extends Reader{ 117 118 private char[] content; 119 private int limit; 120 private int pos = 0; 121 BoundedReader(String content)122 public BoundedReader(String content) { 123 this.limit = content.length(); 124 this.content = new char[limit]; 125 content.getChars(0, limit, this.content, 0); 126 } 127 read()128 public int read() throws IOException { 129 if (pos >= limit) 130 throw new RuntimeException("Read past limit"); 131 return content[pos++]; 132 } 133 read(char[] buf, int offset, int length)134 public int read(char[] buf, int offset, int length) 135 throws IOException 136 { 137 int oldPos = pos; 138 for (int i = offset; i < length; i++) { 139 buf[i] = (char)read(); 140 } 141 return (pos - oldPos); 142 } 143 close()144 public void close() {} 145 } 146 147 } 148