53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
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/* help detect directory cycles efficiently
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Copyright (C) 2003-2004, 2006, 2009-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Jim Meyering */
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#ifndef CYCLE_CHECK_H
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# define CYCLE_CHECK_H 1
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# include <stdint.h>
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# include <stdbool.h>
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# include "dev-ino.h"
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# include "same-inode.h"
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struct cycle_check_state
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{
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struct dev_ino dev_ino;
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uintmax_t chdir_counter;
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int magic;
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};
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void cycle_check_init (struct cycle_check_state *state);
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bool cycle_check (struct cycle_check_state *state, struct stat const *sb);
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# define CYCLE_CHECK_REFLECT_CHDIR_UP(State, SB_dir, SB_subdir) \
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do \
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{ \
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/* You must call cycle_check at least once before using this macro. */ \
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if ((State)->chdir_counter == 0) \
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abort (); \
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if (SAME_INODE ((State)->dev_ino, SB_subdir)) \
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{ \
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(State)->dev_ino.st_dev = (SB_dir).st_dev; \
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(State)->dev_ino.st_ino = (SB_dir).st_ino; \
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} \
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} \
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while (0)
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#endif
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