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/* vi: set sw=4 ts=4: */
/*
* Utility routines.
*
* Copyright (C) many different people.
* If you wrote this, please acknowledge your work.
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libbb.h"
typedef struct ino_dev_hash_bucket_struct {
struct ino_dev_hash_bucket_struct *next;
ino_t ino;
dev_t dev;
char name[1];
} ino_dev_hashtable_bucket_t;
#define HASH_SIZE 311 /* Should be prime */
#define hash_inode(i) ((i) % HASH_SIZE)
/* array of [HASH_SIZE] elements */
static ino_dev_hashtable_bucket_t **ino_dev_hashtable;
/*
* Return name if statbuf->st_ino && statbuf->st_dev are recorded in
* ino_dev_hashtable, else return NULL
*/
char *is_in_ino_dev_hashtable(const struct stat *statbuf)
{
ino_dev_hashtable_bucket_t *bucket;
if (!ino_dev_hashtable)
return NULL;
bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)];
while (bucket != NULL) {
if ((bucket->ino == statbuf->st_ino)
&& (bucket->dev == statbuf->st_dev)
) {
return bucket->name;
}
bucket = bucket->next;
}
return NULL;
}
/* Add statbuf to statbuf hash table */
void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name)
{
int i;
ino_dev_hashtable_bucket_t *bucket;
i = hash_inode(statbuf->st_ino);
if (!name)
name = "";
bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + strlen(name));
bucket->ino = statbuf->st_ino;
bucket->dev = statbuf->st_dev;
strcpy(bucket->name, name);
if (!ino_dev_hashtable)
ino_dev_hashtable = xzalloc(HASH_SIZE * sizeof(*ino_dev_hashtable));
bucket->next = ino_dev_hashtable[i];
ino_dev_hashtable[i] = bucket;
}
#if ENABLE_FEATURE_CLEAN_UP
/* Clear statbuf hash table */
void reset_ino_dev_hashtable(void)
{
int i;
ino_dev_hashtable_bucket_t *bucket;
for (i = 0; i < HASH_SIZE; i++) {
while (ino_dev_hashtable[i] != NULL) {
bucket = ino_dev_hashtable[i]->next;
free(ino_dev_hashtable[i]);
ino_dev_hashtable[i] = bucket;
}
}
free(ino_dev_hashtable);
ino_dev_hashtable = NULL;
}
#endif
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