This repository was archived by the owner on Sep 8, 2020. It is now read-only.
Repository navigation
Expand file tree
/
Copy pathHashtable.c
More file actions
172 lines (150 loc) · 4.19 KB
/
Copy pathHashtable.c
File metadata and controls
172 lines (150 loc) · 4.19 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/*
htop - Hashtable.c
(C) 2004-2011 Hisham H. Muhammad
Released under the GNU GPL, see the COPYING file
in the source distribution for its full text.
*/
#include "Hashtable.h"
#include "XAlloc.h"
#include <stdlib.h>
#include <assert.h>
/*{
#include <stdbool.h>
typedef struct Hashtable_ Hashtable;
typedef void(*Hashtable_PairFunction)(int, void*, void*);
typedef struct HashtableItem {
unsigned int key;
void* value;
struct HashtableItem* next;
} HashtableItem;
struct Hashtable_ {
int size;
HashtableItem** buckets;
int items;
bool owner;
};
}*/
#ifdef DEBUG
static bool Hashtable_isConsistent(Hashtable* this) {
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;
}
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
static HashtableItem* HashtableItem_new(unsigned int key, void* value) {
HashtableItem* this;
this = xMalloc(sizeof(HashtableItem));
this->key = key;
this->value = value;
this->next = NULL;
return this;
}
Hashtable* Hashtable_new(int size, bool owner) {
Hashtable* this;
this = xMalloc(sizeof(Hashtable));
this->items = 0;
this->size = size;
this->buckets = (HashtableItem**) xCalloc(size, sizeof(HashtableItem*));
this->owner = owner;
assert(Hashtable_isConsistent(this));
return this;
}
void Hashtable_delete(Hashtable* this) {
assert(Hashtable_isConsistent(this));
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;
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)
free((*bucketPtr)->value);
(*bucketPtr)->value = value;
break;
} else
bucketPtr = &((*bucketPtr)->next);
assert(Hashtable_isConsistent(this));
}
void* Hashtable_remove(Hashtable* this, unsigned int key) {
unsigned int index = key % this->size;
assert(Hashtable_isConsistent(this));
HashtableItem** bucket;
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;
this->items--;
if (this->owner) {
free(value);
assert(Hashtable_isConsistent(this));
return NULL;
} else {
assert(Hashtable_isConsistent(this));
return value;
}
}
}
assert(Hashtable_isConsistent(this));
return NULL;
}
inline void* Hashtable_get(Hashtable* this, unsigned int key) {
unsigned int index = key % this->size;
HashtableItem* bucketPtr = this->buckets[index];
while (true) {
if (bucketPtr == NULL) {
assert(Hashtable_isConsistent(this));
return NULL;
} else if (bucketPtr->key == key) {
assert(Hashtable_isConsistent(this));
return bucketPtr->value;
} else
bucketPtr = bucketPtr->next;
}
}
void Hashtable_foreach(Hashtable* this, Hashtable_PairFunction f, void* userData) {
assert(Hashtable_isConsistent(this));
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;
}
}
assert(Hashtable_isConsistent(this));
}