1 /* Determine whether two stat buffers refer to the same file.
3 Copyright (C) 2006, 2009 Free Software Foundation, Inc.
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 # define SAME_INODE_H 1
21 /* Perform a tri-state query on whether STAT_BUF_1 and STAT_BUF_2
22 represent the same file. Return 1 for equal, 0 for distinct, and
23 -1 for indeterminate (the latter is generally possible only on
24 mingw). Algorithms that use this macro must be prepared to handle
25 the indeterminate case without wrong results. For example, if an
26 optimization is possible if two files are the same but unsafe if
27 distinct, use SAME_INODE()==1; whereas for an optimization that is
28 possible only for distinct files, use !SAME_INODE(). */
30 # define SAME_INODE(Stat_buf_1, Stat_buf_2) \
31 (((Stat_buf_1).st_ino == (Stat_buf_2).st_ino \
32 && (Stat_buf_1).st_dev == (Stat_buf_2).st_dev) \
33 ? 1 - 2 * !(Stat_buf_1).st_ino : 0)