| 1 | /* help detect directory cycles efficiently
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| 2 |
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| 3 | Copyright (C) 2003-2004, 2006, 2009-2021 Free Software Foundation, Inc.
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| 4 |
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| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License
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| 16 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 17 |
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| 18 | /* Written by Jim Meyering */
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| 19 |
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| 20 | #ifndef CYCLE_CHECK_H
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| 21 | # define CYCLE_CHECK_H 1
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| 22 |
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| 23 | # include <stdint.h>
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| 24 | # include <stdbool.h>
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| 25 | # include "dev-ino.h"
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| 26 | # include "same-inode.h"
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| 27 |
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| 28 | struct cycle_check_state
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| 29 | {
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| 30 | struct dev_ino dev_ino;
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| 31 | uintmax_t chdir_counter;
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| 32 | int magic;
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| 33 | };
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| 34 |
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| 35 | void cycle_check_init (struct cycle_check_state *state);
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| 36 | bool cycle_check (struct cycle_check_state *state, struct stat const *sb);
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| 37 |
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| 38 | # define CYCLE_CHECK_REFLECT_CHDIR_UP(State, SB_dir, SB_subdir) \
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| 39 | do \
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| 40 | { \
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| 41 | /* You must call cycle_check at least once before using this macro. */ \
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| 42 | if ((State)->chdir_counter == 0) \
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| 43 | abort (); \
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| 44 | if (SAME_INODE ((State)->dev_ino, SB_subdir)) \
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| 45 | { \
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| 46 | (State)->dev_ino.st_dev = (SB_dir).st_dev; \
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| 47 | (State)->dev_ino.st_ino = (SB_dir).st_ino; \
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| 48 | } \
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| 49 | } \
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| 50 | while (0)
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| 51 |
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| 52 | #endif
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