8067964: Native2ascii doesn't close one of the streams it opens

Summary: Change sun.tools.native2ascii.Main.convert() to use try-with-resources; also clean up code formatting.
Reviewed-by: chegar

src/share/classes/sun/tools/native2ascii/Main.java

@@ -71,11 +71,8 @@ import java.text.MessageFormat;
 import java.nio.charset.CharsetEncoder;
 import java.nio.charset.Charset;
 import java.nio.charset.IllegalCharsetNameException;
-import java.nio.file.Files;
 import java.io.UnsupportedEncodingException;
 import java.nio.charset.UnsupportedCharsetException;
-import sun.tools.native2ascii.A2NFilter;
-import sun.tools.native2ascii.N2AFilter;
 
 /**
  * Main program of the native2ascii
@@ -94,7 +91,7 @@ public class Main {
     /**
      * Run the converter
      */
-    public synchronized boolean convert(String argv[]){
+    public synchronized boolean convert(String argv[]) {
         List<String> v = new ArrayList<>(2);
         File outputFile = null;
         boolean createOutputFile = false;
@@ -102,14 +99,14 @@ public class Main {
         // Parse arguments
         for (int i = 0; i < argv.length; i++) {
             if (argv[i].equals("-encoding")) {
-                if ((i + 1) < argv.length){
+                if ((i + 1) < argv.length) {
                     encodingString = argv[++i];
                 } else {
                     error(getMsg("err.bad.arg"));
                     usage();
                     return false;
                 }
-            } else if (argv[i].equals("-reverse")){
+            } else if (argv[i].equals("-reverse")) {
                 reverse = true;
             } else {
                 if (v.size() > 1) {
@@ -119,15 +116,18 @@ public class Main {
                 v.add(argv[i]);
             }
         }
-        if (encodingString == null)
-           defaultEncoding = Charset.defaultCharset().name();
 
+        if (encodingString == null) {
+            defaultEncoding = Charset.defaultCharset().name();
+        }
         char[] lineBreak = System.getProperty("line.separator").toCharArray();
+
         try {
             initializeConverter();
 
-            if (v.size() == 1)
+            if (v.size() == 1) {
                 inputFileName = v.get(0);
+            }
 
             if (v.size() == 2) {
                 inputFileName = v.get(0);
@@ -137,40 +137,38 @@ public class Main {
 
             if (createOutputFile) {
                 outputFile = new File(outputFileName);
-                    if (outputFile.exists() && !outputFile.canWrite()) {
-                        throw new Exception(formatMsg("err.cannot.write", outputFileName));
-                    }
+                if (outputFile.exists() && !outputFile.canWrite()) {
+                    throw new Exception(formatMsg("err.cannot.write", outputFileName));
+                }
             }
 
-            if (reverse){
-                BufferedReader reader = getA2NInput(inputFileName);
-                Writer osw = getA2NOutput(outputFileName);
-                String line;
-
-                while ((line = reader.readLine()) != null) {
-                    osw.write(line.toCharArray());
-                    osw.write(lineBreak);
-                    if (outputFileName == null) { // flush stdout
-                        osw.flush();
+            if (reverse) {
+                try (BufferedReader reader = getA2NInput(inputFileName);
+                        Writer osw = getA2NOutput(outputFileName);) {
+                    String line;
+                    while ((line = reader.readLine()) != null) {
+                        osw.write(line.toCharArray());
+                        osw.write(lineBreak);
+                        if (outputFileName == null) { // flush stdout
+                            osw.flush();
+                        }
                     }
                 }
-                reader.close();  // Close the stream.
-                osw.close();
             } else {
-             //N2A
-                String inLine;
-                BufferedReader in = getN2AInput(inputFileName);
-                BufferedWriter out = getN2AOutput(outputFileName);
-
-                while ((inLine = in.readLine()) != null) {
-                    out.write(inLine.toCharArray());
-                    out.write(lineBreak);
-                    if (outputFileName == null) { // flush stdout
-                        out.flush();
+                // N2A
+                try (BufferedReader in = getN2AInput(inputFileName);
+                        BufferedWriter out = getN2AOutput(outputFileName);) {
+                    String inLine;
+                    while ((inLine = in.readLine()) != null) {
+                        out.write(inLine.toCharArray());
+                        out.write(lineBreak);
+                        if (outputFileName == null) { // flush stdout
+                            out.flush();
+                        }
                     }
                 }
-                out.close();
             }
+
             // Since we are done rename temporary file to desired output file
             if (createOutputFile) {
                 if (outputFile.exists()) {
@@ -182,8 +180,7 @@ public class Main {
                 }
                 tempFile.renameTo(outputFile);
             }
-
-        } catch(Exception e){
+        } catch (Exception e) {
             error(e.toString());
             return false;
         }

test/sun/tools/native2ascii/Native2AsciiTests.sh

@@ -24,7 +24,7 @@
 #
 
 # @test
-# @bug 4630463 4630971 4636448 4701617 4721296 4710890 6247817 7021987
+# @bug 4630463 4630971 4636448 4701617 4721296 4710890 6247817 7021987 8067964
 # @summary Tests miscellaneous native2ascii bugfixes and regressions