2 //gcc -g eina_hash_07.c -o eina_hash_07 `pkg-config --cflags --libs eina`
9 * Eina Hash - phonebook
11 * This example demonstrate the use of Eina Hash by implementing a phonebook
12 * that stores its contact data into the hash.
14 * It indexes the phone numbers by Contact Full Name, so it's a hash with
19 const char *name; // Full name.
20 const char *number; // Phone number.
23 typedef struct _Phone_Entry Phone_Entry;
25 static Phone_Entry _start_entries[] = {
26 { "Wolfgang Amadeus Mozart", "+01 23 456-78910" },
27 { "Ludwig van Beethoven", "+12 34 567-89101" },
28 { "Richard Georg Strauss", "+23 45 678-91012" },
29 { "Heitor Villa-Lobos", "+34 56 789-10123" },
33 static const char *_nicknames[] = {
42 _phone_entry_free_cb(void *data)
48 _phone_book_foreach_cb(const Eina_Hash *phone_book, const void *key,
49 void *data, void *fdata)
51 Phone_Entry **pe = (Phone_Entry **)key;
52 const char *nick = data;
53 printf("%s: %s, nick=%s\n", (*pe)->name, (*pe)->number, nick);
55 // Return EINA_FALSE to stop this callback from being called
60 main(int argc, const char *argv[])
62 Eina_Hash *phone_book = NULL;
64 Phone_Entry *entry_vl = &_start_entries[3];
65 Phone_Entry *p = NULL;
73 phone_book = eina_hash_pointer_new(_phone_entry_free_cb);
75 // Add initial entries to our hash
76 for (i = 0; _start_entries[i].name != NULL; i++)
78 p = &_start_entries[i];
79 eina_hash_add(phone_book, &p,
80 strdup(_nicknames[i]));
82 printf("Phonebook:\n");
83 eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL);
86 // Look for a specific entry and get its nickname
87 nick = eina_hash_find(phone_book, &entry_vl);
90 printf("Printing entry.\n");
91 printf("Name: %s\n", entry_vl->name);
92 printf("Number: %s\n", entry_vl->number);
93 printf("Nick: %s\n\n", nick);
97 r = eina_hash_del(phone_book, &entry_vl, NULL);
98 printf("Hash entry successfully deleted? %d\n\n", r);
100 // Modify the pointer data of an entry and free the old one
101 p = &_start_entries[2];
102 nick = eina_hash_modify(phone_book, &p,
106 // Modify or add an entry to the hash with eina_hash_set
107 // Let's first add a new entry
109 Phone_Entry *p1 = malloc(sizeof(*p1));
110 p1->name = "Raul Seixas";
111 p1->number = "+55 01 234-56789";
112 nick = eina_hash_set(phone_book, &p1,
116 Eina_Error err = eina_error_get();
119 printf("No previous nick found for Raul Seixas. ");
120 printf("Creating new entry.\n");
123 printf("Error when setting nick for Raul Seixas\n");
127 printf("Old nick for Raul Seixas was %s\n", nick);
133 // Now change the nick
135 nick = eina_hash_set(phone_book, &p1,
139 printf("Changing nick for Raul Seixas to raulzao. ");
140 printf("Old nick was %s\n", nick);
145 Eina_Error err = eina_error_get();
147 printf("Error when changing nick for Raul Seixas\n");
150 printf("No previous nick found for Raul Seixas. ");
151 printf("Creating new entry.\n");
155 // There are many ways to iterate over our Phone book.
156 // First, iterate showing the names, phones and associated nicks.
157 printf("Phonebook:\n");
158 eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL);
161 // Now iterate using an iterator
162 printf("Phonebook:\n");
163 it = eina_hash_iterator_tuple_new(phone_book);
164 while (eina_iterator_next(it, &data))
166 Eina_Hash_Tuple *t = data;
167 Phone_Entry **pe = (Phone_Entry **)t->key;
169 printf("%s: %s, nick=%s\n", (*pe)->name, (*pe)->number, nick);
171 eina_iterator_free(it); // Always free the iterator after its use
174 // Just iterate over the keys (names)
175 printf("List of names/numbers in the phone book:\n");
176 it = eina_hash_iterator_key_new(phone_book);
177 while (eina_iterator_next(it, &data))
179 Phone_Entry **pe = (Phone_Entry **)data;
180 printf("%s: %s\n", (*pe)->name, (*pe)->number);
182 eina_iterator_free(it);
185 // Just iterate over the data (nicks)
186 printf("List of nicks in the phone book:\n");
187 it = eina_hash_iterator_data_new(phone_book);
188 while (eina_iterator_next(it, &data))
191 printf("%s\n", nick);
193 eina_iterator_free(it);
196 // Check how many items are in the phone book
197 printf("There are %d items in the hash.\n\n",
198 eina_hash_population(phone_book));
200 // Change the name (key) on an entry
201 Phone_Entry *p2 = malloc(sizeof(*p2));
202 p2->name = "Alceu Valenca";
203 p2->number = "000000000000";
204 eina_hash_move(phone_book, p1, p2);
205 printf("List of phones after change:\n");
206 eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL);
209 // Empty the phone book, but don't destroy it
210 eina_hash_free_buckets(phone_book);
211 printf("There are %d items in the hash.\n\n",
212 eina_hash_population(phone_book));
214 // Phone book could still be used, but we are freeing it since we are
216 eina_hash_free(phone_book);