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Diffstat (limited to 'lib/cycle-check.h')
| -rw-r--r-- | lib/cycle-check.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/lib/cycle-check.h b/lib/cycle-check.h new file mode 100644 index 0000000..a297330 --- /dev/null +++ b/lib/cycle-check.h @@ -0,0 +1,52 @@ +/* help detect directory cycles efficiently + + Copyright (C) 2003-2004, 2006, 2009-2022 Free Software Foundation, 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 3 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, see <https://www.gnu.org/licenses/>. */ + +/* Written by Jim Meyering */ + +#ifndef CYCLE_CHECK_H +# define CYCLE_CHECK_H 1 + +# include <stdint.h> +# include <stdbool.h> +# include "dev-ino.h" +# include "same-inode.h" + +struct cycle_check_state +{ + struct dev_ino dev_ino; + uintmax_t chdir_counter; + int magic; +}; + +void cycle_check_init (struct cycle_check_state *state); +bool cycle_check (struct cycle_check_state *state, struct stat const *sb); + +# define CYCLE_CHECK_REFLECT_CHDIR_UP(State, SB_dir, SB_subdir) \ + do \ + { \ + /* You must call cycle_check at least once before using this macro. */ \ + if ((State)->chdir_counter == 0) \ + abort (); \ + if (SAME_INODE ((State)->dev_ino, SB_subdir)) \ + { \ + (State)->dev_ino.st_dev = (SB_dir).st_dev; \ + (State)->dev_ino.st_ino = (SB_dir).st_ino; \ + } \ + } \ + while (0) + +#endif |