htop/Hashtable.c

153 lines
3.9 KiB
C
Raw Normal View History

2006-03-04 18:16:49 +00:00
/*
2011-12-26 21:35:57 +00:00
htop - Hashtable.c
2011-05-26 16:35:07 +00:00
(C) 2004-2011 Hisham H. Muhammad
Released under the GNU GPLv2, see the COPYING file
2006-03-04 18:16:49 +00:00
in the source distribution for its full text.
*/
#include "Hashtable.h"
2020-10-14 22:56:22 +00:00
#include "XUtils.h"
2006-03-04 18:16:49 +00:00
#include <stdlib.h>
2006-11-08 21:49:07 +00:00
#include <assert.h>
2006-03-04 18:16:49 +00:00
#ifndef NDEBUG
2006-11-08 20:09:48 +00:00
static bool Hashtable_isConsistent(Hashtable* this) {
2006-11-08 20:09:48 +00:00
int items = 0;
for (int i = 0; i < this->size; i++) {
HashtableItem* bucket = this->buckets[i];
while (bucket) {
items++;
bucket = bucket->next;
}
}
return items == this->items;
}
2006-11-12 21:52:14 +00:00
int Hashtable_count(Hashtable* this) {
int items = 0;
for (int i = 0; i < this->size; i++) {
HashtableItem* bucket = this->buckets[i];
while (bucket) {
items++;
bucket = bucket->next;
}
}
assert(items == this->items);
return items;
}
#endif /* NDEBUG */
2006-11-08 20:09:48 +00:00
static HashtableItem* HashtableItem_new(unsigned int key, void* value) {
2006-03-04 18:16:49 +00:00
HashtableItem* this;
2019-10-31 16:39:12 +00:00
2016-02-02 14:53:02 +00:00
this = xMalloc(sizeof(HashtableItem));
2006-03-04 18:16:49 +00:00
this->key = key;
this->value = value;
this->next = NULL;
return this;
}
Hashtable* Hashtable_new(int size, bool owner) {
Hashtable* this;
2019-10-31 16:39:12 +00:00
2016-02-02 14:53:02 +00:00
this = xMalloc(sizeof(Hashtable));
2006-11-08 20:09:48 +00:00
this->items = 0;
2006-03-04 18:16:49 +00:00
this->size = size;
2016-02-02 14:53:02 +00:00
this->buckets = (HashtableItem**) xCalloc(size, sizeof(HashtableItem*));
2006-03-04 18:16:49 +00:00
this->owner = owner;
2006-11-08 20:09:48 +00:00
assert(Hashtable_isConsistent(this));
2006-03-04 18:16:49 +00:00
return this;
}
void Hashtable_delete(Hashtable* this) {
2006-11-08 20:09:48 +00:00
assert(Hashtable_isConsistent(this));
2006-03-04 18:16:49 +00:00
for (int i = 0; i < this->size; i++) {
HashtableItem* walk = this->buckets[i];
while (walk != NULL) {
if (this->owner)
free(walk->value);
HashtableItem* savedWalk = walk;
walk = savedWalk->next;
free(savedWalk);
}
}
free(this->buckets);
free(this);
}
void Hashtable_put(Hashtable* this, unsigned int key, void* value) {
unsigned int index = key % this->size;
2006-03-04 18:16:49 +00:00
HashtableItem** bucketPtr = &(this->buckets[index]);
while (true)
if (*bucketPtr == NULL) {
*bucketPtr = HashtableItem_new(key, value);
this->items++;
break;
} else if ((*bucketPtr)->key == key) {
if (this->owner && (*bucketPtr)->value != value)
2006-03-04 18:16:49 +00:00
free((*bucketPtr)->value);
(*bucketPtr)->value = value;
break;
} else
bucketPtr = &((*bucketPtr)->next);
2006-11-08 20:09:48 +00:00
assert(Hashtable_isConsistent(this));
2006-03-04 18:16:49 +00:00
}
void* Hashtable_remove(Hashtable* this, unsigned int key) {
unsigned int index = key % this->size;
2019-10-31 16:39:12 +00:00
2006-11-08 20:09:48 +00:00
assert(Hashtable_isConsistent(this));
2019-10-31 16:39:12 +00:00
HashtableItem** bucket;
2006-11-08 20:09:48 +00:00
for (bucket = &(this->buckets[index]); *bucket; bucket = &((*bucket)->next) ) {
if ((*bucket)->key == key) {
void* value = (*bucket)->value;
HashtableItem* next = (*bucket)->next;
free(*bucket);
(*bucket) = next;
2006-03-04 18:16:49 +00:00
this->items--;
if (this->owner) {
2006-11-08 20:09:48 +00:00
free(value);
assert(Hashtable_isConsistent(this));
2006-03-04 18:16:49 +00:00
return NULL;
} else {
2006-11-08 20:09:48 +00:00
assert(Hashtable_isConsistent(this));
return value;
2006-03-04 18:16:49 +00:00
}
2006-11-08 20:09:48 +00:00
}
}
assert(Hashtable_isConsistent(this));
return NULL;
2006-03-04 18:16:49 +00:00
}
2006-11-08 20:09:48 +00:00
void* Hashtable_get(Hashtable* this, unsigned int key) {
unsigned int index = key % this->size;
2006-03-04 18:16:49 +00:00
HashtableItem* bucketPtr = this->buckets[index];
while (true) {
2006-03-04 18:16:49 +00:00
if (bucketPtr == NULL) {
2006-11-08 20:09:48 +00:00
assert(Hashtable_isConsistent(this));
2006-03-04 18:16:49 +00:00
return NULL;
} else if (bucketPtr->key == key) {
2006-11-08 20:09:48 +00:00
assert(Hashtable_isConsistent(this));
2006-03-04 18:16:49 +00:00
return bucketPtr->value;
} else
bucketPtr = bucketPtr->next;
}
2006-03-04 18:16:49 +00:00
}
void Hashtable_foreach(Hashtable* this, Hashtable_PairFunction f, void* userData) {
2006-11-08 20:09:48 +00:00
assert(Hashtable_isConsistent(this));
2006-03-04 18:16:49 +00:00
for (int i = 0; i < this->size; i++) {
HashtableItem* walk = this->buckets[i];
while (walk != NULL) {
f(walk->key, walk->value, userData);
walk = walk->next;
}
}
2006-11-08 20:09:48 +00:00
assert(Hashtable_isConsistent(this));
2006-03-04 18:16:49 +00:00
}