[Vala] EOF problems

[Stefan Risberg <steffenomak gmail com>]

I am trying to read a file char by char but I can't find where or how I 
can check if end of line (EOF) was found. I'm writing a simple parser 
for a project but I can't seem to find in the online api doc of gio or 
glib how to check for it. I saw that I can do it using posix, but I 
would rather use gio.

The code I'm working with

////////////////////////////////////////
////// CODE ///////////////////////
////////////////////////////////////////

namespace FsXml
{
    public class Main
    {
        public static int main(string[] args)
        {
            stdout.printf("trying to find file %s\n", args[1]);
            var f = File.new_for_path(args[1]);

            if(!f.query_exists())
            {
                stderr.printf("File does not exist\n");
                return 1;
            }

            try
            {
                var dis = new GLib.DataInputStream(f.read());
                uchar p;

                while(true)
                {
                    p = dis.read_byte();
                    stdout.printf("%c %d\n", p, p);
                }
                stdout.printf("End of file\n");
            }
            catch(IOError e)
            {
                stderr.printf("IOError: %s\n", e.message);
                return 2;
            }
            catch(Error e)
            {
                stderr.printf("Error: %s\n", e.message);
                return 2;
            }

            return 0;
        }
    }
}