209 lines
5.4 KiB
C
209 lines
5.4 KiB
C
//Compile with:
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//gcc -g eina_hash_07.c -o eina_hash_07 `pkg-config --cflags --libs eina`
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#include <stdio.h>
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#include <string.h>
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#include <Eina.h>
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/*
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* Eina Hash - phonebook
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*
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* This example demonstrate the use of Eina Hash by implementing a phonebook
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* that stores its contact data into the hash.
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*
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* It indexes the phone numbers by Contact Full Name, so it's a hash with
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* string keys.
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*/
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struct _Phone_Entry {
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const char *name; // Full name.
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const char *number; // Phone number.
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};
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typedef struct _Phone_Entry Phone_Entry;
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static Phone_Entry _start_entries[] = {
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{ "Wolfgang Amadeus Mozart", "+01 23 456-78910" },
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{ "Ludwig van Beethoven", "+12 34 567-89101" },
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{ "Richard Georg Strauss", "+23 45 678-91012" },
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{ "Heitor Villa-Lobos", "+34 56 789-10123" },
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{ NULL, NULL }
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}; // _start_entries
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static const char *_nicknames[] = {
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"mozzart",
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"betho",
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"george",
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"hector",
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NULL
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};
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static void
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_phone_entry_free_cb(void *data)
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{
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free(data);
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}
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static Eina_Bool
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_phone_book_foreach_cb(const Eina_Hash *phone_book EINA_UNUSED, const void *key,
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void *data, void *fdata EINA_UNUSED)
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{
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Phone_Entry **pe = (Phone_Entry **)key;
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const char *nick = data;
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printf("%s: %s, nick=%s\n", (*pe)->name, (*pe)->number, nick);
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// Return EINA_FALSE to stop this callback from being called
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return EINA_TRUE;
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}
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int
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main(int argc EINA_UNUSED, const char *argv[] EINA_UNUSED)
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{
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Eina_Hash *phone_book = NULL;
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int i;
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Phone_Entry *entry_vl = &_start_entries[3];
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Phone_Entry *p = NULL;
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char *nick = NULL;
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Eina_Bool r;
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Eina_Iterator *it;
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void *data;
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eina_init();
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phone_book = eina_hash_pointer_new(_phone_entry_free_cb);
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// Add initial entries to our hash
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for (i = 0; _start_entries[i].name != NULL; i++)
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{
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p = &_start_entries[i];
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eina_hash_add(phone_book, &p,
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strdup(_nicknames[i]));
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}
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printf("Phonebook:\n");
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eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL);
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printf("\n");
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// Look for a specific entry and get its nickname
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nick = eina_hash_find(phone_book, &entry_vl);
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if (nick)
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{
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printf("Printing entry.\n");
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printf("Name: %s\n", entry_vl->name);
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printf("Number: %s\n", entry_vl->number);
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printf("Nick: %s\n\n", nick);
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}
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// Delete this entry
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r = eina_hash_del(phone_book, &entry_vl, NULL);
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printf("Hash entry successfully deleted? %d\n\n", r);
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// Modify the pointer data of an entry and free the old one
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p = &_start_entries[2];
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nick = eina_hash_modify(phone_book, &p,
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strdup("el jorge"));
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free(nick);
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// Modify or add an entry to the hash with eina_hash_set
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// Let's first add a new entry
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Phone_Entry *p1 = malloc(sizeof(*p1));
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p1->name = "Raul Seixas";
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p1->number = "+55 01 234-56789";
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nick = eina_hash_set(phone_book, &p1,
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strdup("raulzito"));
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if (!nick)
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{
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printf("No previous nick found for Raul Seixas. ");
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printf("Creating new entry.\n");
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}
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else
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{
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printf("Old nick for Raul Seixas was %s\n", nick);
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free(nick);
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}
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printf("\n");
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// Now change the nick
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nick = eina_hash_set(phone_book, &p1,
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strdup("raulzao"));
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if (nick)
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{
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printf("Changing nick for Raul Seixas to raulzao. ");
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printf("Old nick was %s\n", nick);
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free(nick);
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}
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else
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{
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printf("No previous nick found for Raul Seixas. ");
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printf("Creating new entry.\n");
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}
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// There are many ways to iterate over our Phone book.
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// First, iterate showing the names, phones and associated nicks.
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printf("Phonebook:\n");
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eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL);
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printf("\n");
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// Now iterate using an iterator
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printf("Phonebook:\n");
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it = eina_hash_iterator_tuple_new(phone_book);
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while (eina_iterator_next(it, &data))
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{
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Eina_Hash_Tuple *t = data;
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Phone_Entry **pe = (Phone_Entry **)t->key;
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nick = t->data;
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printf("%s: %s, nick=%s\n", (*pe)->name, (*pe)->number, nick);
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}
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eina_iterator_free(it); // Always free the iterator after its use
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printf("\n");
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// Just iterate over the keys (names)
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printf("List of names/numbers in the phone book:\n");
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it = eina_hash_iterator_key_new(phone_book);
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while (eina_iterator_next(it, &data))
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{
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Phone_Entry **pe = (Phone_Entry **)data;
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printf("%s: %s\n", (*pe)->name, (*pe)->number);
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}
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eina_iterator_free(it);
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printf("\n");
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// Just iterate over the data (nicks)
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printf("List of nicks in the phone book:\n");
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it = eina_hash_iterator_data_new(phone_book);
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while (eina_iterator_next(it, &data))
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{
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nick = data;
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printf("%s\n", nick);
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}
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eina_iterator_free(it);
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printf("\n");
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// Check how many items are in the phone book
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printf("There are %d items in the hash.\n\n",
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eina_hash_population(phone_book));
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// Change the name (key) on an entry
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Phone_Entry *p2 = malloc(sizeof(*p2));
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p2->name = "Alceu Valenca";
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p2->number = "000000000000";
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eina_hash_move(phone_book, p1, p2);
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printf("List of phones after change:\n");
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eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL);
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printf("\n");
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// Empty the phone book, but don't destroy it
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eina_hash_free_buckets(phone_book);
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printf("There are %d items in the hash.\n\n",
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eina_hash_population(phone_book));
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// Phone book could still be used, but we are freeing it since we are
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// done for now
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eina_hash_free(phone_book);
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free(p1);
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free(p2);
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eina_shutdown();
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}
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