1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) tons of folks.  Tracking down who wrote what
6 * isn't something I'm going to worry about...  If you wrote something
7 * here, please feel free to acknowledge your work.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 *
23 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
24 * Permission has been granted to redistribute this code under the GPL.
25 *
26 */
27
28#include <stdio.h>
29#include <stdlib.h>
30#include <string.h>
31#include "libbb.h"
32
33#define HASH_SIZE	311		/* Should be prime */
34#define hash_inode(i)	((i) % HASH_SIZE)
35
36static ino_dev_hashtable_bucket_t *ino_dev_hashtable[HASH_SIZE];
37
38/*
39 * Return 1 if statbuf->st_ino && statbuf->st_dev are recorded in
40 * `ino_dev_hashtable', else return 0
41 *
42 * If NAME is a non-NULL pointer to a character pointer, and there is
43 * a match, then set *NAME to the value of the name slot in that
44 * bucket.
45 */
46int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name)
47{
48	ino_dev_hashtable_bucket_t *bucket;
49
50	bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)];
51	while (bucket != NULL) {
52	  if ((bucket->ino == statbuf->st_ino) &&
53		  (bucket->dev == statbuf->st_dev))
54	  {
55		if (name) *name = bucket->name;
56		return 1;
57	  }
58	  bucket = bucket->next;
59	}
60	return 0;
61}
62
63/* Add statbuf to statbuf hash table */
64void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name)
65{
66	int i;
67	size_t s;
68	ino_dev_hashtable_bucket_t *bucket;
69
70	i = hash_inode(statbuf->st_ino);
71	s = name ? strlen(name) : 0;
72	bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + s);
73	bucket->ino = statbuf->st_ino;
74	bucket->dev = statbuf->st_dev;
75	if (name)
76		strcpy(bucket->name, name);
77	else
78		bucket->name[0] = '\0';
79	bucket->next = ino_dev_hashtable[i];
80	ino_dev_hashtable[i] = bucket;
81}
82
83/* Clear statbuf hash table */
84void reset_ino_dev_hashtable(void)
85{
86	int i;
87	ino_dev_hashtable_bucket_t *bucket;
88
89	for (i = 0; i < HASH_SIZE; i++) {
90		while (ino_dev_hashtable[i] != NULL) {
91			bucket = ino_dev_hashtable[i]->next;
92			free(ino_dev_hashtable[i]);
93			ino_dev_hashtable[i] = bucket;
94		}
95	}
96}
97
98
99/* END CODE */
100/*
101Local Variables:
102c-file-style: "linux"
103c-basic-offset: 4
104tab-width: 4
105End:
106*/
107