1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2011 Petr Machata, Red Hat Inc.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of the
8 * License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 */
20
21#ifndef LENS_H
22#define LENS_H
23
24#include <stdio.h>
25#include "forward.h"
26
27struct lens {
28	/* Format VALUE into STREAM.  The dictionary of all arguments
29	 * is given for purposes of evaluating array lengths and other
30	 * dynamic expressions.  Returns number of characters
31	 * outputted, -1 in case of failure.  */
32	int (*format_cb)(struct lens *lens, FILE *stream, struct value *value,
33			 struct value_dict *arguments);
34
35	/* Erase any memory allocated for LENS.  Keep the LENS pointer
36	 * itself intact.  */
37	void (*destroy_cb)(struct lens *lens);
38};
39
40/* Extracts a lens from VALUE and calls lens_format on that.  */
41int format_argument(FILE *stream, struct value *value,
42		    struct value_dict *arguments);
43
44/* Calls format callback associated with LENS.  */
45int lens_format(struct lens *lens, FILE *stream, struct value *value,
46		struct value_dict *arguments);
47
48/* Calls destroy callback associated with LENS.  */
49void lens_destroy(struct lens *lens);
50
51#endif /* LENS_H */
52