/*
 *   surf - visualizing algebraic curves and algebraic surfaces
 *   Copyright (C) 1996-1997 Friedrich-Alexander-Universitaet
 *                           Erlangen-Nuernberg
 *                 1997-2000 Johannes Gutenberg-Universitaet Mainz
 *   Authors: Stephan Endrass, Hans Huelf, Ruediger Oertel,
 *            Kai Schneider, Ralf Schmitt, Johannes Beigel
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */


#ifndef FILEWRITER_H
#define FILEWRITER_H

#include <stdio.h>

class FileWriter
{
private:
	FileWriter (const FileWriter &);
	void operator=(const FileWriter &);
public:
	FileWriter(const char *str=0)
		{
			name = str;
			f=0;
		}
	~FileWriter()
		{
			if (!f)
				return;

			if (name[0]=='|')
				pclose(f);
			else
				fclose(f);
		}

	FILE *openFile(const char *str=0)
		{
			if (f)
				return f;
			if (str)
				name = str;

			assert(name);
			if (name[0] == '|') {
				f = popen (name+1, "w");
			} else {
				f = fopen(name, "w");
			}
			return f;
		}
	const char *getName()
		{
			assert(name);
			return name[0]=='|' ? "surf_picture" : name; 				
		}
	bool isWritingToPipe()
		{
			assert(name);
			return name[0]=='|';
		}
private:
	const char *name;
	FILE *f;
};

#endif