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lens.h
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lens.h
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/*
* This file is part of ltrace.
* Copyright (C) 2011 Petr Machata, Red Hat Inc.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef LENS_H
#define LENS_H
#include <stdio.h>
#include "forward.h"
struct lens {
/* Format VALUE into STREAM. The dictionary of all arguments
* is given for purposes of evaluating array lengths and other
* dynamic expressions. Returns number of characters
* outputted, -1 in case of failure. */
int (*format_cb)(struct lens *lens, FILE *stream, struct value *value,
struct value_dict *arguments);
/* Erase any memory allocated for LENS. Keep the LENS pointer
* itself intact. */
void (*destroy_cb)(struct lens *lens);
};
/* Extracts a lens from VALUE and calls lens_format on that. */
int format_argument(FILE *stream, struct value *value,
struct value_dict *arguments);
/* Calls format callback associated with LENS. */
int lens_format(struct lens *lens, FILE *stream, struct value *value,
struct value_dict *arguments);
/* Calls destroy callback associated with LENS. */
void lens_destroy(struct lens *lens);
#endif /* LENS_H */