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Diffstat (limited to 'libraries/eina/src/examples/eina_hash_04.c')
-rw-r--r-- | libraries/eina/src/examples/eina_hash_04.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/libraries/eina/src/examples/eina_hash_04.c b/libraries/eina/src/examples/eina_hash_04.c new file mode 100644 index 0000000..e900475 --- /dev/null +++ b/libraries/eina/src/examples/eina_hash_04.c | |||
@@ -0,0 +1,195 @@ | |||
1 | #include <stdio.h> | ||
2 | #include <string.h> | ||
3 | #include <Eina.h> | ||
4 | |||
5 | /* | ||
6 | * Eina Hash - phonebook | ||
7 | * | ||
8 | * This example demonstrate the use of Eina Hash by implementing a phonebook | ||
9 | * that stores its contact data into the hash. | ||
10 | * | ||
11 | * It indexes the phone numbers by Contact Full Name, so it's a hash with | ||
12 | * string keys. | ||
13 | */ | ||
14 | |||
15 | struct _Phone_Entry { | ||
16 | const char *name; // Full name. | ||
17 | const char *number; // Phone number. | ||
18 | }; | ||
19 | |||
20 | typedef struct _Phone_Entry Phone_Entry; | ||
21 | |||
22 | static Phone_Entry _start_entries[] = { | ||
23 | { "Wolfgang Amadeus Mozart", "+01 23 456-78910" }, | ||
24 | { "Ludwig van Beethoven", "+12 34 567-89101" }, | ||
25 | { "Richard Georg Strauss", "+23 45 678-91012" }, | ||
26 | { "Heitor Villa-Lobos", "+34 56 789-10123" }, | ||
27 | { NULL, NULL } | ||
28 | }; // _start_entries | ||
29 | |||
30 | static void | ||
31 | _phone_entry_free_cb(void *data) | ||
32 | { | ||
33 | free(data); | ||
34 | } | ||
35 | |||
36 | static Eina_Bool | ||
37 | _phone_book_foreach_cb(const Eina_Hash *phone_book, const void *key, | ||
38 | void *data, void *fdata) | ||
39 | { | ||
40 | const char *name = key; | ||
41 | const char *number = data; | ||
42 | printf("%s: %s\n", name, number); | ||
43 | |||
44 | // Return EINA_FALSE to stop this callback from being called | ||
45 | return EINA_TRUE; | ||
46 | } | ||
47 | |||
48 | int | ||
49 | main(int argc, const char *argv[]) | ||
50 | { | ||
51 | Eina_Hash *phone_book = NULL; | ||
52 | int i; | ||
53 | const char *entry_name = "Heitor Villa-Lobos"; | ||
54 | char *phone = NULL; | ||
55 | Eina_Bool r; | ||
56 | Eina_Iterator *it; | ||
57 | void *data; | ||
58 | |||
59 | eina_init(); | ||
60 | |||
61 | phone_book = eina_hash_string_djb2_new(_phone_entry_free_cb); | ||
62 | |||
63 | // Add initial entries to our hash | ||
64 | for (i = 0; _start_entries[i].name != NULL; i++) | ||
65 | { | ||
66 | eina_hash_add(phone_book, _start_entries[i].name, | ||
67 | strdup(_start_entries[i].number)); | ||
68 | } | ||
69 | |||
70 | // Look for a specific entry and get its phone number | ||
71 | phone = eina_hash_find(phone_book, entry_name); | ||
72 | if (phone) | ||
73 | { | ||
74 | printf("Printing entry.\n"); | ||
75 | printf("Name: %s\n", entry_name); | ||
76 | printf("Number: %s\n\n", phone); | ||
77 | } | ||
78 | |||
79 | // Delete this entry | ||
80 | r = eina_hash_del(phone_book, entry_name, NULL); | ||
81 | printf("Hash entry successfully deleted? %d\n\n", r); | ||
82 | |||
83 | // Modify the pointer data of an entry and free the old one | ||
84 | phone = eina_hash_modify(phone_book, "Richard Georg Strauss", | ||
85 | strdup("+23 45 111-11111")); | ||
86 | free(phone); | ||
87 | |||
88 | // Modify or add an entry to the hash with eina_hash_set | ||
89 | // Let's first add a new entry | ||
90 | eina_error_set(0); | ||
91 | phone = eina_hash_set(phone_book, "Raul Seixas", | ||
92 | strdup("+55 01 234-56789")); | ||
93 | if (!phone) | ||
94 | { | ||
95 | Eina_Error err = eina_error_get(); | ||
96 | if (!err) | ||
97 | { | ||
98 | printf("No previous phone found for Raul Seixas. "); | ||
99 | printf("Creating new entry.\n"); | ||
100 | } | ||
101 | else | ||
102 | printf("Error when setting phone for Raul Seixas\n"); | ||
103 | } | ||
104 | else | ||
105 | { | ||
106 | printf("Old phone for Raul Seixas was %s\n", phone); | ||
107 | free(phone); | ||
108 | } | ||
109 | |||
110 | printf("\n"); | ||
111 | |||
112 | // Now change the phone number | ||
113 | eina_error_set(0); | ||
114 | phone = eina_hash_set(phone_book, "Raul Seixas", | ||
115 | strdup("+55 02 222-22222")); | ||
116 | if (phone) | ||
117 | { | ||
118 | printf("Changing phone for Raul Seixas to +55 02 222-22222. "); | ||
119 | printf("Old phone was %s\n", phone); | ||
120 | free(phone); | ||
121 | } | ||
122 | else | ||
123 | { | ||
124 | Eina_Error err = eina_error_get(); | ||
125 | if (err) | ||
126 | printf("Error when changing phone for Raul Seixas\n"); | ||
127 | else | ||
128 | { | ||
129 | printf("No previous phone found for Raul Seixas. "); | ||
130 | printf("Creating new entry.\n"); | ||
131 | } | ||
132 | } | ||
133 | |||
134 | // There are many ways to iterate over our Phone book. | ||
135 | // First, iterate showing the names and associated numbers. | ||
136 | printf("List of phones:\n"); | ||
137 | eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL); | ||
138 | printf("\n"); | ||
139 | |||
140 | // Now iterate using an iterator | ||
141 | printf("List of phones:\n"); | ||
142 | it = eina_hash_iterator_tuple_new(phone_book); | ||
143 | while (eina_iterator_next(it, &data)) | ||
144 | { | ||
145 | Eina_Hash_Tuple *t = data; | ||
146 | const char *name = t->key; | ||
147 | const char *number = t->data; | ||
148 | printf("%s: %s\n", name, number); | ||
149 | } | ||
150 | eina_iterator_free(it); // Always free the iterator after its use | ||
151 | printf("\n"); | ||
152 | |||
153 | // Just iterate over the keys (names) | ||
154 | printf("List of names in the phone book:\n"); | ||
155 | it = eina_hash_iterator_key_new(phone_book); | ||
156 | while (eina_iterator_next(it, &data)) | ||
157 | { | ||
158 | const char *name = data; | ||
159 | printf("%s\n", name); | ||
160 | } | ||
161 | eina_iterator_free(it); | ||
162 | printf("\n"); | ||
163 | |||
164 | // Just iterate over the data (numbers) | ||
165 | printf("List of numbers in the phone book:\n"); | ||
166 | it = eina_hash_iterator_data_new(phone_book); | ||
167 | while (eina_iterator_next(it, &data)) | ||
168 | { | ||
169 | const char *number = data; | ||
170 | printf("%s\n", number); | ||
171 | } | ||
172 | eina_iterator_free(it); | ||
173 | printf("\n"); | ||
174 | |||
175 | // Check how many items are in the phone book | ||
176 | printf("There are %d items in the hash.\n\n", | ||
177 | eina_hash_population(phone_book)); | ||
178 | |||
179 | // Change the name (key) on an entry | ||
180 | eina_hash_move(phone_book, "Raul Seixas", "Alceu Valenca"); | ||
181 | printf("List of phones after change:\n"); | ||
182 | eina_hash_foreach(phone_book, _phone_book_foreach_cb, NULL); | ||
183 | printf("\n"); | ||
184 | |||
185 | // Empty the phone book, but don't destroy it | ||
186 | eina_hash_free_buckets(phone_book); | ||
187 | printf("There are %d items in the hash.\n\n", | ||
188 | eina_hash_population(phone_book)); | ||
189 | |||
190 | // Phone book could still be used, but we are freeing it since we are | ||
191 | // done for now | ||
192 | eina_hash_free(phone_book); | ||
193 | |||
194 | eina_shutdown(); | ||
195 | } | ||