test/jdk/java/io/File/WinDeviceName.java

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/* @test
   @bug 6176051 4858457
   @summary Check whether reserved names are handled correctly on Windows
   @requires (os.family == "windows")
 */

import java.io.File;
import java.io.IOException;

public class WinDeviceName {
    private static String devnames[] = {
        "CON", "PRN", "AUX", "NUL", "COM1", "COM2", "COM3", "COM4",
        "COM5", "COM6", "COM7", "COM8", "COM9", "LPT1", "LPT2",
        "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
        "CLOCK$"
    };
    public static void main(String[] args) {
        String osName = System.getProperty("os.name");
        for (int i = 0; i < devnames.length; i++) {
            String names[] = { devnames[i], devnames[i] + ".TXT",
                               devnames[i].toLowerCase(),
                               devnames[i].toLowerCase() + ".txt" };

            for (String name : names) {
                File f = new File(name);
                if (f.isFile()) {
                    if ("CLOCK$".equals(devnames[i]) &&
                        (osName.startsWith("Windows 9") ||
                         osName.startsWith("Windows Me"))) {
                        //"CLOCK$" is a reserved device name for NT
                        continue;
                    }
                    throw new RuntimeException("isFile() returns true for " +
                            "Device name " + devnames[i]);
                }

                if (!"CLOCK$".equals(devnames[i])) {
                    try {
                        System.out.println((new File(name)).getCanonicalPath());
                    } catch(IOException ie) {
                        throw new RuntimeException("Fail to get canonical " +
                                "path for " + name);
                    }
                }
            }
        }
    }
}