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 27 struct 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. */ 41 int format_argument(FILE *stream, struct value *value, 42 struct value_dict *arguments); 43 44 /* Calls format callback associated with LENS. */ 45 int lens_format(struct lens *lens, FILE *stream, struct value *value, 46 struct value_dict *arguments); 47 48 /* Calls destroy callback associated with LENS. */ 49 void lens_destroy(struct lens *lens); 50 51 #endif /* LENS_H */ 52
