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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, const void *key,
void *data, void *fdata)
{
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, const char *argv[])
{
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();
}