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eina_hash_08.c

This example shows the the usage of eina_hash_add(), eina_hash_add_by_hash(), eina_hash_direct_add_by_hash(), eina_hash_del(), eina_hash_del_by_key_hash(), eina_hash_del_by_key(), eina_hash_del_by_data(), eina_hash_find_by_hash() and eina_hash_modify_by_hash().

//Compile with:
//gcc -g eina_hash_08.c -o eina_hash_08 `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 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)
{
const char *name = key;
const char *number = data;
printf("%s: %s\n", name, number);
// 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;
const char *entry_name = "Heitor Villa-Lobos";
int entry_size;
const char *saved_entry_name = "Alceu Valenca";
int saved_entry_size = sizeof("Alceu Valenca");
const char *phone = NULL;
Eina_Bool r;
eina_init();
phone_book = eina_hash_string_superfast_new(_phone_entry_free_cb);
// Add initial entries to our hash
for (i = 0; _start_entries[i].name != NULL; i++)
{
eina_hash_add(phone_book, _start_entries[i].name,
strdup(_start_entries[i].number));
}
// Delete entries
r = eina_hash_del(phone_book, entry_name, NULL);
printf("Hash entry successfully deleted? %d\n\n", r);
int hash = eina_hash_superfast("Ludwig van Beethoven",
sizeof("Ludwig van Beethoven"));
r = eina_hash_del_by_key_hash(phone_book, "Ludwig van Beethoven",
sizeof("Ludwig van Beethoven"), hash);
printf("Hash entry successfully deleted? %d\n\n", r);
r = eina_hash_del_by_key(phone_book, "Richard Georg Strauss");
printf("Hash entry successfully deleted? %d\n\n", r);
// add entry by hash
entry_name = "Raul_Seixas";
entry_size = sizeof("Raul Seixas");
phone = strdup("+33 33 333-33333");
hash = eina_hash_superfast(entry_name, entry_size);
eina_hash_add_by_hash(phone_book, entry_name, entry_size, hash, phone);
// don't need to free 'phone' after the next del:
r = eina_hash_del_by_data(phone_book, phone);
printf("Hash entry successfully deleted? %d\n\n", r);
// add entry by hash directly - no copy of the key will be done
hash = eina_hash_superfast(saved_entry_name, saved_entry_size);
phone = strdup("+44 44 444-44444");
eina_hash_direct_add_by_hash(phone_book, saved_entry_name,
saved_entry_size, hash, phone);
// find the added entry by its hash:
phone = eina_hash_find_by_hash(phone_book, saved_entry_name,
saved_entry_size, hash);
if (phone)
{
char *newphone = strdup("+55 55 555-55555");
phone = eina_hash_modify_by_hash(phone_book, saved_entry_name,
saved_entry_size, hash, newphone);
if (phone)
printf("changing phone to %s, old one was %s\n", newphone, phone);
else
printf("couldn't modify entry identified by %d\n", hash);
}
else
{
printf("couldn't find entry identified by %d\n", hash);
}
eina_hash_free(phone_book);
eina_shutdown();
}