110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) many different people. If you wrote this, please
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* acknowledge your work.
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*
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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 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libbb.h"
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#define HASH_SIZE 311 /* Should be prime */
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#define hash_inode(i) ((i) % HASH_SIZE)
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typedef struct ino_dev_hash_bucket_struct {
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struct ino_dev_hash_bucket_struct *next;
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ino_t ino;
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dev_t dev;
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char name[1];
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} ino_dev_hashtable_bucket_t;
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static ino_dev_hashtable_bucket_t *ino_dev_hashtable[HASH_SIZE];
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/*
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* Return 1 if statbuf->st_ino && statbuf->st_dev are recorded in
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* `ino_dev_hashtable', else return 0
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*
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* If NAME is a non-NULL pointer to a character pointer, and there is
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* a match, then set *NAME to the value of the name slot in that
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* bucket.
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*/
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int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name)
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{
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ino_dev_hashtable_bucket_t *bucket;
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bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)];
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while (bucket != NULL) {
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if ((bucket->ino == statbuf->st_ino) &&
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(bucket->dev == statbuf->st_dev))
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{
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if (name) *name = bucket->name;
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return 1;
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}
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bucket = bucket->next;
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}
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return 0;
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}
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/* Add statbuf to statbuf hash table */
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void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name)
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{
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int i;
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size_t s;
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ino_dev_hashtable_bucket_t *bucket;
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i = hash_inode(statbuf->st_ino);
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s = name ? strlen(name) : 0;
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bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + s);
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bucket->ino = statbuf->st_ino;
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bucket->dev = statbuf->st_dev;
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if (name)
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strcpy(bucket->name, name);
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else
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bucket->name[0] = '\0';
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bucket->next = ino_dev_hashtable[i];
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ino_dev_hashtable[i] = bucket;
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}
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/* Clear statbuf hash table */
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void reset_ino_dev_hashtable(void)
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{
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int i;
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ino_dev_hashtable_bucket_t *bucket;
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for (i = 0; i < HASH_SIZE; i++) {
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while (ino_dev_hashtable[i] != NULL) {
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bucket = ino_dev_hashtable[i]->next;
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free(ino_dev_hashtable[i]);
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ino_dev_hashtable[i] = bucket;
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}
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}
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}
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/* END CODE */
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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