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authorDavid Walter Seikel2012-01-04 18:41:13 +1000
committerDavid Walter Seikel2012-01-04 18:41:13 +1000
commitdd7595a3475407a7fa96a97393bae8c5220e8762 (patch)
treee341e911d7eb911a51684a7412ef7f7c7605d28e /libraries/eina/src/examples/eina_hash_05.c
parentAdd the skeleton. (diff)
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Add the base Enlightenment Foundation Libraries - eina, eet, evas, ecore, embryo, and edje.
Note that embryo wont be used, but I'm not sure yet if you can build edje without it.
Diffstat (limited to 'libraries/eina/src/examples/eina_hash_05.c')
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1 files changed, 198 insertions, 0 deletions
diff --git a/libraries/eina/src/examples/eina_hash_05.c b/libraries/eina/src/examples/eina_hash_05.c
new file mode 100644
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1#include <stdio.h>
2#include <string.h>
3#include <Eina.h>
4
5/*
6 * Eina Hash - phonebook
7 *
8 * This example demonstrate the use of Eina Hash by implementing a phonebook
9 * that stores its contact data into the hash.
10 *
11 * It indexes the phone numbers by Contact Full Name, so it's a hash with
12 * string keys.
13 */
14
15struct _Phone_Entry {
16 int32_t id; // Full name.
17 const char *number; // Phone number.
18};
19
20typedef struct _Phone_Entry Phone_Entry;
21
22static Phone_Entry _start_entries[] = {
23 { 1, "+01 23 456-78910" },
24 { 2, "+12 34 567-89101" },
25 { 3, "+23 45 678-91012" },
26 { 4, "+34 56 789-10123" },
27 { -1, NULL }
28}; // _start_entries
29
30static void
31_phone_entry_free_cb(void *data)
32{
33 free(data);
34}
35
36static Eina_Bool
37_phone_book_foreach_cb(const Eina_Hash *phone_book, const void *key,
38 void *data, void *fdata)
39{
40 const int32_t *id = key;
41 const char *number = data;
42 printf("%d: %s\n", *id, number);
43
44 // Return EINA_FALSE to stop this callback from being called
45 return EINA_TRUE;
46}
47
48int
49main(int argc, const char *argv[])
50{
51 Eina_Hash *phone_book = NULL;
52 int i;
53 int32_t entry_id = 4;
54 char *phone = NULL;
55 Eina_Bool r;
56 Eina_Iterator *it;
57 void *data;
58
59 eina_init();
60
61 phone_book = eina_hash_int32_new(_phone_entry_free_cb);
62
63 // Add initial entries to our hash
64 for (i = 0; _start_entries[i].id != -1; i++)
65 {
66 eina_hash_add(phone_book, &_start_entries[i].id,
67 strdup(_start_entries[i].number));
68 }
69
70 // Look for a specific entry and get its phone number
71 phone = eina_hash_find(phone_book, &entry_id);
72 if (phone)
73 {
74 printf("Printing entry.\n");
75 printf("Id: %d\n", entry_id);
76 printf("Number: %s\n\n", phone);
77 }
78
79 // Delete this entry
80 r = eina_hash_del(phone_book, &entry_id, NULL);
81 printf("Hash entry successfully deleted? %d\n\n", r);
82
83 // Modify the pointer data of an entry and free the old one
84 int32_t id3 = 3;
85 phone = eina_hash_modify(phone_book, &id3,
86 strdup("+23 45 111-11111"));
87 free(phone);
88
89 // Modify or add an entry to the hash with eina_hash_set
90 // Let's first add a new entry
91 int32_t id5 = 5;
92 eina_error_set(0);
93 phone = eina_hash_set(phone_book, &id5,
94 strdup("+55 01 234-56789"));
95 if (!phone)
96 {
97 Eina_Error err = eina_error_get();
98 if (!err)
99 {
100 printf("No previous phone found for id5. ");
101 printf("Creating new entry.\n");
102 }
103 else
104 printf("Error when setting phone for Raul Seixas\n");
105 }
106 else
107 {
108 printf("Old phone for id5 was %s\n", phone);
109 free(phone);
110 }
111
112 printf("\n");
113
114 // Now change the phone number
115 eina_error_set(0);
116 phone = eina_hash_set(phone_book, &id5,
117 strdup("+55 02 222-22222"));
118 if (phone)
119 {
120 printf("Changing phone for id5 to +55 02 222-22222. ");
121 printf("Old phone was %s\n", phone);
122 free(phone);
123 }
124 else
125 {
126 Eina_Error err = eina_error_get();
127 if (err)
128 printf("Error when changing phone for id5\n");
129 else
130 {
131 printf("No previous phone found for id5. ");
132 printf("Creating new entry.\n");
133 }
134 }
135
136 // There are many ways to iterate over our Phone book.
137 // First, iterate showing the names and associated numbers.
138 printf("List of phones:\n");
139 eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL);
140 printf("\n");
141
142 // Now iterate using an iterator
143 printf("List of phones:\n");
144 it = eina_hash_iterator_tuple_new(phone_book);
145 while (eina_iterator_next(it, &data))
146 {
147 Eina_Hash_Tuple *t = data;
148 const int32_t *id = t->key;
149 const char *number = t->data;
150 printf("%d: %s\n", *id, number);
151 }
152 eina_iterator_free(it); // Always free the iterator after its use
153 printf("\n");
154
155 // Just iterate over the keys (names)
156 printf("List of ids in the phone book:\n");
157 it = eina_hash_iterator_key_new(phone_book);
158 while (eina_iterator_next(it, &data))
159 {
160 const int32_t *id = data;
161 printf("%d\n", *id);
162 }
163 eina_iterator_free(it);
164 printf("\n");
165
166 // Just iterate over the data (numbers)
167 printf("List of numbers in the phone book:\n");
168 it = eina_hash_iterator_data_new(phone_book);
169 while (eina_iterator_next(it, &data))
170 {
171 const char *number = data;
172 printf("%s\n", number);
173 }
174 eina_iterator_free(it);
175 printf("\n");
176
177 // Check how many items are in the phone book
178 printf("There are %d items in the hash.\n\n",
179 eina_hash_population(phone_book));
180
181 // Change the name (key) on an entry
182 int32_t id6 = 6;
183 eina_hash_move(phone_book, &id5, &id6);
184 printf("List of phones after change:\n");
185 eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL);
186 printf("\n");
187
188 // Empty the phone book, but don't destroy it
189 eina_hash_free_buckets(phone_book);
190 printf("There are %d items in the hash.\n\n",
191 eina_hash_population(phone_book));
192
193 // Phone book could still be used, but we are freeing it since we are
194 // done for now
195 eina_hash_free(phone_book);
196
197 eina_shutdown();
198}