Tizen Native API
6.0
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eina_hash_07.c
Same example as Eina_Hash in action but using a "pointer" hash table instead of "string superfast".
//Compile with: //gcc -g eina_hash_07.c -o eina_hash_07 `pkg-config --cflags --libs eina` #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 { const char *name; // Full name. const char *number; // Phone number. }; typedef struct _Phone_Entry Phone_Entry; static Phone_Entry _start_entries[] = { { "Wolfgang Amadeus Mozart", "+01 23 456-78910" }, { "Ludwig van Beethoven", "+12 34 567-89101" }, { "Richard Georg Strauss", "+23 45 678-91012" }, { "Heitor Villa-Lobos", "+34 56 789-10123" }, { NULL, NULL } }; // _start_entries static const char *_nicknames[] = { "mozzart", "betho", "george", "hector", NULL }; static void _phone_entry_free_cb(void *data) { free(data); } static Eina_Bool _phone_book_foreach_cb(const Eina_Hash *phone_book EINA_UNUSED, const void *key, void *data, void *fdata EINA_UNUSED) { Phone_Entry **pe = (Phone_Entry **)key; const char *nick = data; printf("%s: %s, nick=%s\n", (*pe)->name, (*pe)->number, nick); // Return EINA_FALSE to stop this callback from being called return EINA_TRUE; } int main(int argc EINA_UNUSED, const char *argv[] EINA_UNUSED) { Eina_Hash *phone_book = NULL; int i; Phone_Entry *entry_vl = &_start_entries[3]; Phone_Entry *p = NULL; char *nick = NULL; Eina_Bool r; Eina_Iterator *it; void *data; eina_init(); phone_book = eina_hash_pointer_new(_phone_entry_free_cb); // Add initial entries to our hash for (i = 0; _start_entries[i].name != NULL; i++) { p = &_start_entries[i]; eina_hash_add(phone_book, &p, strdup(_nicknames[i])); } printf("Phonebook:\n"); eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL); printf("\n"); // Look for a specific entry and get its nickname nick = eina_hash_find(phone_book, &entry_vl); if (nick) { printf("Printing entry.\n"); printf("Name: %s\n", entry_vl->name); printf("Number: %s\n", entry_vl->number); printf("Nick: %s\n\n", nick); } // Delete this entry r = eina_hash_del(phone_book, &entry_vl, NULL); printf("Hash entry successfully deleted? %d\n\n", r); // Modify the pointer data of an entry and free the old one p = &_start_entries[2]; nick = eina_hash_modify(phone_book, &p, strdup("el jorge")); free(nick); // Modify or add an entry to the hash with eina_hash_set // Let's first add a new entry Phone_Entry *p1 = malloc(sizeof(*p1)); p1->name = "Raul Seixas"; p1->number = "+55 01 234-56789"; nick = eina_hash_set(phone_book, &p1, strdup("raulzito")); if (!nick) { printf("No previous nick found for Raul Seixas. "); printf("Creating new entry.\n"); } else { printf("Old nick for Raul Seixas was %s\n", nick); free(nick); } printf("\n"); // Now change the nick nick = eina_hash_set(phone_book, &p1, strdup("raulzao")); if (nick) { printf("Changing nick for Raul Seixas to raulzao. "); printf("Old nick was %s\n", nick); free(nick); } else { printf("No previous nick found for Raul Seixas. "); printf("Creating new entry.\n"); } // There are many ways to iterate over our Phone book. // First, iterate showing the names, phones and associated nicks. printf("Phonebook:\n"); eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL); printf("\n"); // Now iterate using an iterator printf("Phonebook:\n"); it = eina_hash_iterator_tuple_new(phone_book); while (eina_iterator_next(it, &data)) { Eina_Hash_Tuple *t = data; Phone_Entry **pe = (Phone_Entry **)t->key; nick = t->data; printf("%s: %s, nick=%s\n", (*pe)->name, (*pe)->number, nick); } eina_iterator_free(it); // Always free the iterator after its use printf("\n"); // Just iterate over the keys (names) printf("List of names/numbers in the phone book:\n"); it = eina_hash_iterator_key_new(phone_book); while (eina_iterator_next(it, &data)) { Phone_Entry **pe = (Phone_Entry **)data; printf("%s: %s\n", (*pe)->name, (*pe)->number); } eina_iterator_free(it); printf("\n"); // Just iterate over the data (nicks) printf("List of nicks in the phone book:\n"); it = eina_hash_iterator_data_new(phone_book); while (eina_iterator_next(it, &data)) { nick = data; printf("%s\n", nick); } 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 Phone_Entry *p2 = malloc(sizeof(*p2)); p2->name = "Alceu Valenca"; p2->number = "000000000000"; eina_hash_move(phone_book, p1, p2); 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); free(p1); free(p2); eina_shutdown(); }