#include <unistd.h>#include <stdlib.h>#include <stdio.h>#include <fcntl.h>#include <ndbm.h>#include <string.h>#define TEST_DB_FILE "/tmp/dbm2_test"#define ITEMS_USED 3/* A struct to use to test dbm */struct test_data {    char misc_chars[15];    int  any_integer;    char more_chars[21];};int main() {    struct test_data items_to_store[ITEMS_USED];    struct test_data item_retrieved;    char key_to_use[20];    int i, result;    datum key_datum;    datum data_datum;        DBM *dbm_ptr;    dbm_ptr = dbm_open(TEST_DB_FILE, O_RDWR | O_CREAT, 0666);    if (!dbm_ptr) {        fprintf(stderr, "Failed to open database\n");        exit(EXIT_FAILURE);            }        /* put some data in the structures */    memset(items_to_store, '\0', sizeof(items_to_store));    strcpy(items_to_store[0].misc_chars, "First!");    items_to_store[0].any_integer = 47;    strcpy(items_to_store[0].more_chars, "foo");    strcpy(items_to_store[1].misc_chars, "bar");    items_to_store[1].any_integer = 13;    strcpy(items_to_store[1].more_chars, "unlucky?");    strcpy(items_to_store[2].misc_chars, "Third");    items_to_store[2].any_integer = 3;    strcpy(items_to_store[2].more_chars, "baz");    for (i = 0; i < ITEMS_USED; i++) {            /* build a key to use */        sprintf(key_to_use, "%c%c%d",            items_to_store[i].misc_chars[0],            items_to_store[i].more_chars[0],            items_to_store[i].any_integer);            /* build the key datum strcture */        key_datum.dptr = key_to_use;        key_datum.dsize = strlen(key_to_use);        data_datum.dptr = (void *)&items_to_store[i];        data_datum.dsize = sizeof(struct test_data);        result = dbm_store(dbm_ptr, key_datum, data_datum, DBM_REPLACE);        if (result != 0) {            fprintf(stderr, "dbm_store failed on key %s\n", key_to_use);            exit(2);        }    } /* for */        /* now try and delete some data */    sprintf(key_to_use, "bu%d", 13); /* this is the key for the second item */    key_datum.dptr = key_to_use;    key_datum.dsize = strlen(key_to_use);    if (dbm_delete(dbm_ptr, key_datum) == 0) {        printf("Data with key %s deleted\n", key_to_use);    }    else {        printf("Nothing deleted for key %s\n", key_to_use);    }    for (key_datum = dbm_firstkey(dbm_ptr);              key_datum.dptr;              key_datum = dbm_nextkey(dbm_ptr)) {        data_datum = dbm_fetch(dbm_ptr, key_datum);        if (data_datum.dptr) {            printf("Data retrieved\n");            memcpy(&item_retrieved, data_datum.dptr, data_datum.dsize);            printf("Retrieved item - %s %d %s\n",                   item_retrieved.misc_chars,                   item_retrieved.any_integer,                   item_retrieved.more_chars);        }        else {            printf("Woops - no data found for key %s\n", key_to_use);        }    } /* for each key */        dbm_close(dbm_ptr);    exit(EXIT_SUCCESS);}