void database_get(struct Connection *conn, int id) {
struct Address *addr = &conn->db->rows[id];
if(addr->set)
address_print(addr);
else
die("id is not set");
}
void database_delete(struct Connection *conn, int id) {
struct Address addr = {.id=id, .set=0};
conn->db->rows[id] = addr;
}
void database_list(struct Connection *conn) {
for(int i=0; i<MAX_ROWS; ++i) {
struct Address *addr = &conn->db->rows[i];
if(addr->set)
address_print(addr);
}
}
int main(int argc, char *argv[]) {
if(argc < 3)
die("usage: a.out file action additional_params");
char *filename = argv[1];
char action = argv[2][0];
struct Connection *conn = database_open(filename, action);
int id=0;
if(argc > 3) id = atoi(argv[3]);
if(id >= MAX_ROWS) die("record id too high");
switch (action) {
case 'c':
database_create(conn);
database_write(conn);
break;
case 'g':
if(argc!=4) die("need an id for database_get()");
database_get(conn,id);
break;
case 's':
if(argc!=6) die("need id, name, email for database_set()");
database_set(conn,id,argv[4],argv[5]);
database_write(conn);
break;
case 'd':
if(argc!=4) die("need id to delete");
database_delete(conn,id);
database_write(conn);
break;
case 'l':
database_list(conn);
break;
default:
die("invalid action: c=create, g=get, s=set, d=delete, l=list");
}
database_close(conn);
return 0;
}
void database_create(struct Connection *conn)
{
int i = 0;
for(i = 0; i < MAX_ROWS; i++) {
// make a prototype to initialize the database
struct Address addr = {.id = i, .set = 0};
// then assign it to conn
conn->db->rows[i] = addr;
}
printf("got to bottom of database create");
}
void database_set(struct Connection *conn, int id, const char *name,
const char *email)
{
struct Address *addr = &conn->db->rows[id];
if(addr->set) die("Already set, delete it first");
addr->set = 1;
// WARNING FIX THIS
char *res = strncpy(addr->name, name, MAX_DATA);
// demonstrate that strncpy bug
if(!res) die("Name copy failed");
res = strncpy(addr->email, email, MAX_DATA);
if(!res) die("Email copy failed");
}
void database_get(struct Connection *conn, int id)
{
struct Address *addr = &conn->db->rows[id];
if(addr->set) {
address_print(addr);
} else {
die("ID is not set");
}
}
void database_delete(struct Connection *conn, int id)
{
struct Address addr = {.id = id, .set = 0};
conn->db->rows[id] = addr;
}
void database_list(struct Connection *conn)
{
int i = 0;
struct Database *db = conn->db;
for(i = 0; i < MAX_ROWS; i++) {
struct Address *cur = &db->rows[i];
if(cur->set) {
address_print(cur);
}
}
}
int main(int argc, char *argv[])
{
if(argc < 3) die("USAGE: ex17 <dbfile> <action> [action params]");
char *filename = argv[1];
char action = argv[2][0];
struct Connection *conn = database_open(filename, action);
int id = 0;
if(argc > 3) id = atoi(argv[3]);
if(id >= MAX_ROWS) die("There's not that many records.");
switch(action) {
case 'c':
database_create(conn);
database_write(conn);
break;
case 'g':
if(argc != 4) die("Need an id to get");
database_get(conn, id);
break;
case 's':
if(argc != 6) die("Need id, name, email to set");
database_set(conn, id, argv[4], argv[5]);
database_write(conn);
break;
case 'd':
if(argc != 4) die("Need id to delete");
database_delete(conn, id);
database_write(conn);
break;
case 'l':
database_list(conn);
break;
default:
die("Invalid action, only: c=create, g=get, s=set, d=del, l=list");
}
database_close(conn);
return 0;
}
