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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
#include <stdio.h>
#include <string.h>
#include <Eina.h>
/*
* Eina Hash - phonebook
*
* This example demonstrate the use of Eina Hash by implementing a phonebook
* that stores its contact data into the hash.
*
* It indexes the phone numbers by Contact Full Name, so it's a hash with
* string keys.
*/
struct _Phone_Entry {
int32_t id; // Full name.
const char *number; // Phone number.
};
typedef struct _Phone_Entry Phone_Entry;
static Phone_Entry _start_entries[] = {
{ 1, "+01 23 456-78910" },
{ 2, "+12 34 567-89101" },
{ 3, "+23 45 678-91012" },
{ 4, "+34 56 789-10123" },
{ -1, NULL }
}; // _start_entries
static void
_phone_entry_free_cb(void *data)
{
free(data);
}
static Eina_Bool
_phone_book_foreach_cb(const Eina_Hash *phone_book, const void *key,
void *data, void *fdata)
{
const int32_t *id = key;
const char *number = data;
printf("%d: %s\n", *id, number);
// Return EINA_FALSE to stop this callback from being called
return EINA_TRUE;
}
int
main(int argc, const char *argv[])
{
Eina_Hash *phone_book = NULL;
int i;
int32_t entry_id = 4;
char *phone = NULL;
Eina_Bool r;
Eina_Iterator *it;
void *data;
eina_init();
phone_book = eina_hash_int32_new(_phone_entry_free_cb);
// Add initial entries to our hash
for (i = 0; _start_entries[i].id != -1; i++)
{
eina_hash_add(phone_book, &_start_entries[i].id,
strdup(_start_entries[i].number));
}
// Look for a specific entry and get its phone number
phone = eina_hash_find(phone_book, &entry_id);
if (phone)
{
printf("Printing entry.\n");
printf("Id: %d\n", entry_id);
printf("Number: %s\n\n", phone);
}
// Delete this entry
r = eina_hash_del(phone_book, &entry_id, NULL);
printf("Hash entry successfully deleted? %d\n\n", r);
// Modify the pointer data of an entry and free the old one
int32_t id3 = 3;
phone = eina_hash_modify(phone_book, &id3,
strdup("+23 45 111-11111"));
free(phone);
// Modify or add an entry to the hash with eina_hash_set
// Let's first add a new entry
int32_t id5 = 5;
eina_error_set(0);
phone = eina_hash_set(phone_book, &id5,
strdup("+55 01 234-56789"));
if (!phone)
{
Eina_Error err = eina_error_get();
if (!err)
{
printf("No previous phone found for id5. ");
printf("Creating new entry.\n");
}
else
printf("Error when setting phone for Raul Seixas\n");
}
else
{
printf("Old phone for id5 was %s\n", phone);
free(phone);
}
printf("\n");
// Now change the phone number
eina_error_set(0);
phone = eina_hash_set(phone_book, &id5,
strdup("+55 02 222-22222"));
if (phone)
{
printf("Changing phone for id5 to +55 02 222-22222. ");
printf("Old phone was %s\n", phone);
free(phone);
}
else
{
Eina_Error err = eina_error_get();
if (err)
printf("Error when changing phone for id5\n");
else
{
printf("No previous phone found for id5. ");
printf("Creating new entry.\n");
}
}
// There are many ways to iterate over our Phone book.
// First, iterate showing the names and associated numbers.
printf("List of phones:\n");
eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL);
printf("\n");
// Now iterate using an iterator
printf("List of phones:\n");
it = eina_hash_iterator_tuple_new(phone_book);
while (eina_iterator_next(it, &data))
{
Eina_Hash_Tuple *t = data;
const int32_t *id = t->key;
const char *number = t->data;
printf("%d: %s\n", *id, number);
}
eina_iterator_free(it); // Always free the iterator after its use
printf("\n");
// Just iterate over the keys (names)
printf("List of ids in the phone book:\n");
it = eina_hash_iterator_key_new(phone_book);
while (eina_iterator_next(it, &data))
{
const int32_t *id = data;
printf("%d\n", *id);
}
eina_iterator_free(it);
printf("\n");
// Just iterate over the data (numbers)
printf("List of numbers in the phone book:\n");
it = eina_hash_iterator_data_new(phone_book);
while (eina_iterator_next(it, &data))
{
const char *number = data;
printf("%s\n", number);
}
eina_iterator_free(it);
printf("\n");
// Check how many items are in the phone book
printf("There are %d items in the hash.\n\n",
eina_hash_population(phone_book));
// Change the name (key) on an entry
int32_t id6 = 6;
eina_hash_move(phone_book, &id5, &id6);
printf("List of phones after change:\n");
eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL);
printf("\n");
// Empty the phone book, but don't destroy it
eina_hash_free_buckets(phone_book);
printf("There are %d items in the hash.\n\n",
eina_hash_population(phone_book));
// Phone book could still be used, but we are freeing it since we are
// done for now
eina_hash_free(phone_book);
eina_shutdown();
}
|
