190 lines
4.8 KiB
C
190 lines
4.8 KiB
C
//Compile with:
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//gcc -g eina_hash_06.c -o eina_hash_06 `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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int64_t id; // 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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{ 1, "+01 23 456-78910" },
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{ 2, "+12 34 567-89101" },
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{ 3, "+23 45 678-91012" },
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{ 4, "+34 56 789-10123" },
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{ -1, NULL }
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}; // _start_entries
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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, const void *key,
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void *data, void *fdata EINA_UNUSED)
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{
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const int64_t *id = key;
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const char *number = data;
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printf("%lld: %s\n", (long long int)*id, number);
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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, const char *argv[])
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{
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(void)argc;
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(void)argv;
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Eina_Hash *phone_book = NULL;
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int i;
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int64_t entry_id = 4;
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char *phone = 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_int64_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].id != -1; i++)
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{
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eina_hash_add(phone_book, &_start_entries[i].id,
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strdup(_start_entries[i].number));
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}
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// Look for a specific entry and get its phone number
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phone = eina_hash_find(phone_book, &entry_id);
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if (phone)
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{
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printf("Printing entry.\n");
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printf("Id: %lld\n", (long long int)entry_id);
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printf("Number: %s\n\n", phone);
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}
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// Delete this entry
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r = eina_hash_del(phone_book, &entry_id, 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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int64_t id3 = 3;
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phone = eina_hash_modify(phone_book, &id3,
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strdup("+23 45 111-11111"));
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free(phone);
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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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int64_t id5 = 5;
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phone = eina_hash_set(phone_book, &id5,
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strdup("+55 01 234-56789"));
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if (!phone)
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{
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printf("No previous phone found for id5. ");
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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 phone for id5 was %s\n", phone);
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free(phone);
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}
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printf("\n");
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// Now change the phone number
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phone = eina_hash_set(phone_book, &id5,
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strdup("+55 02 222-22222"));
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if (phone)
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{
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printf("Changing phone for id5 to +55 02 222-22222. ");
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printf("Old phone was %s\n", phone);
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free(phone);
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}
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else
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{
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printf("No previous phone found for id5. ");
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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 and associated numbers.
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printf("List of phones:\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("List of phones:\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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const int64_t *id = t->key;
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const char *number = t->data;
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printf("%lld: %s\n", (long long int)*id, number);
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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 ids 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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const int64_t *id = data;
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printf("%lld\n", (long long int)*id);
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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 (numbers)
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printf("List of numbers 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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const char *number = data;
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printf("%s\n", number);
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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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int64_t id6 = 6;
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eina_hash_move(phone_book, &id5, &id6);
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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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eina_shutdown();
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}
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