Patch: FYI: jv-convert -vs- --help

[Tom Tromey]

I'm checking this in.

This adds --help and --version support to jv-convert.
It also fixes a few minor divergences from GNU standards.

This is part of PR 5030.

Tom

Index: ChangeLog
from  Tom Tromey  <tromey@redhat.com>

	For PR libgcj/5303:
	* gnu/gcj/convert/Convert.java (error): Program is called
	`jv-convert'.  Print GNU-style message.  Exit with status 1, not
	-1.
	(main): Handle --help and --version.
	(help): New method.
	(version): Likewise.

Index: gnu/gcj/convert/Convert.java
===================================================================
RCS file: /cvs/gcc/gcc/libjava/gnu/gcj/convert/Convert.java,v
retrieving revision 1.3
diff -u -r1.3 Convert.java
--- gnu/gcj/convert/Convert.java 2000/03/07 19:55:24 1.3
+++ gnu/gcj/convert/Convert.java 2002/01/10 00:35:29
@@ -1,4 +1,4 @@
-/* Copyright (C) 1999  Free Software Foundation
+/* Copyright (C) 1999, 2002  Free Software Foundation
 
    This file is part of libgcj.
 
@@ -13,13 +13,42 @@
 {
   static void error (String message)
   {
-    System.err.print("convert: ");
+    System.err.print("jv-convert: ");
     System.err.println(message);
-    System.err.println("Usage:  convert [--from srcEncoding] [--to dstEncoding]");
-    System.err.println("  [inputfile [outputfile]]");
-    System.exit(-1);
+    System.err.println("Try `jv-convert --help' for more information.");
+    System.exit(1);
   }
 
+  static void help ()
+  {
+    System.out.println("Usage: jv-convert [OPTIONS] [INPUTFILE [OUTPUTFILE]]");
+    System.out.println("");
+    System.out.println("Convert from one encoding to another.");
+    System.out.println("");
+    System.out.println("   --encoding FROM");
+    System.out.println("   --from FROM        use FROM as source encoding name");
+    System.out.println("   --to TO            use TO as target encoding name");
+    System.out.println("   -i FILE            read from FILE");
+    System.out.println("   -o FILE            print output to FILE");
+    System.out.println("   --reverse          swap FROM and TO encodings");
+    System.out.println("   --help             print this help, then exit");
+    System.out.println("   --version          print version number, then exit");
+    System.out.println("");
+    System.out.println("`-' as a file name argument can be used to refer to stdin or stdout.");
+    System.exit(0);
+  }
+
+  static void version ()
+  {
+    System.out.println("jv-convert (GNU libgcj) "
+		       + System.getProperty("java.vm.version"));
+    System.out.println("");
+    System.out.println("Copyright 1999, 2002 Free Software Foundation");
+    System.out.println("This is free software; see the source for copying conditions.  There is NO");
+    System.out.println("warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.");
+    System.exit(0);
+  }
+
   static void missing (String arg)
   {
     error("missing arg after `" + arg + "' option");
@@ -66,6 +95,14 @@
 	      {
 		reverse = true;
 	      }
+	    else if (arg.equals("-help") || arg.equals("--help"))
+	      {
+		help ();
+	      }
+	    else if (arg.equals("-version") || arg.equals("--version"))
+	      {
+		version ();
+	      }
 	    else if (arg.equals("-"))
 	      {
 		switch (seenNames)
@@ -143,7 +180,7 @@
       }
     catch (java.io.IOException ex)
       {
-	System.err.print("convert exception: ");
+	System.err.print("jv-convert exception: ");
 	System.err.println(ex);
 	System.exit(-1);
       }