diff options
Diffstat (limited to 'lib/fts-cycle.c')
| -rw-r--r-- | lib/fts-cycle.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/lib/fts-cycle.c b/lib/fts-cycle.c deleted file mode 100644 index 19c5ded4c..000000000 --- a/lib/fts-cycle.c +++ /dev/null @@ -1,165 +0,0 @@ -/* Detect cycles in file tree walks. - - Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc. - - Written by Jim Meyering. - - 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 2, 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, write to the Free Software Foundation, - Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ - -#ifdef HAVE_CONFIG_H -# include <config.h> -#endif - -#include "cycle-check.h" -#include "hash.h" - -/* Use each of these to map a device/inode pair to an FTSENT. */ -struct Active_dir -{ - dev_t dev; - ino_t ino; - FTSENT *fts_ent; -}; - -static bool -AD_compare (void const *x, void const *y) -{ - struct Active_dir const *ax = x; - struct Active_dir const *ay = y; - return ax->ino == ay->ino - && ax->dev == ay->dev; -} - -static size_t -AD_hash (void const *x, size_t table_size) -{ - struct Active_dir const *ax = x; - return (uintmax_t) ax->ino % table_size; -} - -/* Set up the cycle-detection machinery. */ - -static bool -setup_dir (FTS *fts) -{ - if (fts->fts_options & (FTS_TIGHT_CYCLE_CHECK | FTS_LOGICAL)) - { - enum { HT_INITIAL_SIZE = 31 }; - fts->fts_cycle.ht = hash_initialize (HT_INITIAL_SIZE, NULL, AD_hash, - AD_compare, free); - if (! fts->fts_cycle.ht) - return false; - } - else - { - fts->fts_cycle.state = malloc (sizeof *fts->fts_cycle.state); - if (! fts->fts_cycle.state) - return false; - cycle_check_init (fts->fts_cycle.state); - } - - return true; -} - -/* Enter a directory during a file tree walk. */ - -static bool -enter_dir (FTS *fts, FTSENT *ent) -{ - if (fts->fts_options & (FTS_TIGHT_CYCLE_CHECK | FTS_LOGICAL)) - { - struct stat const *st = ent->fts_statp; - struct Active_dir *ad = malloc (sizeof *ad); - struct Active_dir *ad_from_table; - - if (!ad) - return false; - - ad->dev = st->st_dev; - ad->ino = st->st_ino; - ad->fts_ent = ent; - - /* See if we've already encountered this directory. - This can happen when following symlinks as well as - with a corrupted directory hierarchy. */ - ad_from_table = hash_insert (fts->fts_cycle.ht, ad); - - if (ad_from_table != ad) - { - free (ad); - if (!ad_from_table) - return false; - - /* There was an entry with matching dev/inode already in the table. - Record the fact that we've found a cycle. */ - ent->fts_cycle = ad_from_table->fts_ent; - ent->fts_info = FTS_DC; - } - } - else - { - if (cycle_check (fts->fts_cycle.state, ent->fts_statp)) - { - /* FIXME: setting fts_cycle like this isn't proper. - To do what the documentation requires, we'd have to - go around the cycle again and find the right entry. - But no callers in coreutils use the fts_cycle member. */ - ent->fts_cycle = ent; - ent->fts_info = FTS_DC; - } - } - - return true; -} - -/* Leave a directory during a file tree walk. */ - -static void -leave_dir (FTS *fts, FTSENT *ent) -{ - struct stat const *st = ent->fts_statp; - if (fts->fts_options & (FTS_TIGHT_CYCLE_CHECK | FTS_LOGICAL)) - { - struct Active_dir obj; - void *found; - obj.dev = st->st_dev; - obj.ino = st->st_ino; - found = hash_delete (fts->fts_cycle.ht, &obj); - if (!found) - abort (); - free (found); - } - else - { - FTSENT *parent = ent->fts_parent; - if (parent != NULL) - CYCLE_CHECK_REFLECT_CHDIR_UP (fts->fts_cycle.state, - *(parent->fts_statp), *st); - } -} - -/* Free any memory used for cycle detection. */ - -static void -free_dir (FTS *sp) -{ - if (sp->fts_options & (FTS_TIGHT_CYCLE_CHECK | FTS_LOGICAL)) - { - if (sp->fts_cycle.ht) - hash_free (sp->fts_cycle.ht); - } - else - free (sp->fts_cycle.state); -} |