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;
char *name = "\0";
if(strcmp(argv[2],"f")==0){
name = argv[3];
}
else 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 'd':
if(argc != 4) die("Need id to delete");
Database_delete(conn, id);
Database_write(conn);
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 'l':
Database_list(conn);
break;
case 'f':
Database_find(conn, name);
break;
default:
die("Invalid action, only: c=create, g=get, s=set, d=del, l=list");
}
Database_close(conn);
return 0;
}
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];
Database_open(filename, action);
int id = 0;
if (action != 'c' && action != 'f' && argc > 3) {
id = atoi(argv[3]);
if (id >= conn->db->max_rows)
die("There are not that many records.");
}
switch (action) {
// Create
case 'c':
if (argc != 5)
die("MAX_DATA and MAX_ROWS required.");
conn->db->max_data = atoi(argv[3]);
conn->db->max_rows = atoi(argv[4]);
Database_create();
Database_write();
break;
// Get
case 'g':
if (argc != 4)
die("Need an ID to get.");
Database_get(id);
break;
// Set
case 's':
if (argc != 6)
die("Need ID, name, and email to set.");
Database_set(id, argv[4], argv[5]);
Database_write();
break;
// Find
case 'f':
if (argc != 4)
die("Need a name or email to search for.");
Database_find(argv[3]);
break;
// Delete
case 'd':
if (argc != 4)
die("Need ID to delete.");
Database_delete(id);
Database_write();
break;
// List
case 'l':
Database_list();
break;
default:
die("Invalid action, only: c=create, g=get, s=set, d=delete, l=list");
}
Database_close();
return 0;
}
int main(int argc, char *argv[])
{
if(argc < 3) die("USAGE: ex17 <dbfile> <action> [action params]", NULL);
int max_data = MAX_DATA;
int max_rows = MAX_ROWS;
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.", conn);
switch(action) {
case 'f':
if(argc != 4) die("Need a name to find", conn);
Database_find(conn, argv[3]);
break;
case 'c':
max_data = argv[3] ? atoi(argv[3]) : MAX_DATA;
max_rows = argv[4] ? atoi(argv[4]) : MAX_ROWS;
Database_create(conn, max_data, max_rows);
Database_write(conn);
break;
case 'g':
if(argc != 4) die("Need an id to get", conn);
Database_get(conn,id);
break;
case 's':
if(argc != 6) die("Need id, name, email to set", conn);
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
if(argc != 4) die("Need id to delete", conn);
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", conn);
}
Database_close(conn);
return 0;
}
int main(int argc, char *argv[])
{
char usage[64];
sprintf(usage, "USAGE: %s <dbfile> <action> [action params]", basename(argv[0]));
if(argc < 3) die(usage, NULL);
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.", conn);
switch(action) {
case 'c':
Database_create(conn);
Database_write(conn);
break;
case 'g':
if(argc != 4) die("Need an id to get", conn);
Database_get(conn, id);
break;
case 's':
if(argc != 7) die("Need id, name, email, and street to set", conn);
Database_set(conn, id, argv[4], argv[5], argv[6]);
Database_write(conn);
break;
case 'd':
if(argc != 4) die("Need id to delete", conn);
Database_delete(conn, id);
Database_write(conn);
break;
case 'f':
if(argc != 4) die("Need something to find", conn);
Database_find(conn, argv[3]);
break;
case 'l':
Database_list(conn);
break;
default:
die("Invalid action, only: c=create, g=get, s=set, d=del, l=list, f=find", conn);
}
Database_close(conn);
return 0;
}
int main(int argc, char *argv[])
{
if(argc < 3) die("USAGE: ex17 <dbfile> <action> [action params]", NULL);
char *filename = argv[1];
char action = argv[2][0];
struct Connection *conn = Database_open(filename, action);
int id = 0;
if((argc > 3) && (action != 'c') && (action != 'f')) id = atoi(argv[3]);
//if(id >= conn->db->MAX_ROWS) die("There's not that many records.", conn);
switch(action) {
case 'c':
Database_create(conn, atoi(argv[3]), atoi(argv[4]));
Database_write(conn);
break;
case 'g':
if(argc != 4) die("Need an id to get", conn);
Database_get(conn, id);
break;
case 's':
if(argc != 7) die("Need id, name, email and age to set", conn);
Database_set(conn, id, argv[4], argv[5], atoi(argv[6]));
Database_write(conn);
break;
case 'd':
if(argc != 4) die("Need an id to delete", conn);
Database_delete(conn, id);
Database_write(conn);
break;
case 'l':
Database_list(conn);
break;
case 'f':
Database_find(conn, argv[3], argv[4]);
break;
default:
die("Invalid action, only: c=create, g=get, s=set, d=delete, l=list", conn);
}
Database_close(conn);
return 0;
}
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];
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();
Database_write();
break;
case 'g':
if(argc != 4) die("Need an id to get");
Database_get(id);
break;
case 's':
if(argc != 6) die("Need id, name, email to set");
Database_set(id, argv[4], argv[5]);
Database_write();
break;
case 'd':
if(argc != 4) die("Need an id to delete)");
Database_delete(id);
Database_write();
break;
case 'l':
Database_list();
break;
case 'f':
Database_find(argv[3]);
break;
default:
die("Invalid action, only c=create, g=get, s=set, d=del, l=list");
}
Database_close();
return 0;
}
int main(int argc, char *argv[])
{
char *filename = argv[1];
char action = argv[2][0];
struct Connection *conn = Database_open(filename, action);
int id = 0;
if (argc < 3) die("USAGE: ex17 <dbfile> <action> [action params]", conn);
if(argc > 3) id = atoi(argv[3]);
if(id >= MAX_ROWS) die("There's not that many records.", conn);
switch(action) {
case 'c':
if(argc == 5) Database_create(conn, atoi(argv[3]), atoi(argv[4]));
else Database_create(conn, 0, 0);
Database_write(conn);
break;
case 'g':
if(argc != 4) die("Need an id to get", conn);
Database_get(conn, id);
break;
case 's':
if(argc != 6) die("Need id, name, email to set.", conn);
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
if(argc != 4) die("Need id to delete", conn);
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, r=resize", conn);
}
Database_close(conn);
return 0;
}
int ui(int argc, char *argv[])
{
struct Connection *conn = NULL;
char action = 'r';
char *filename;
char *name = "the dude";
char *email = "*****@*****.**";
int id = 0;
while (1) {
fputs("$ ", stdout);
char cmd = getchar();
switch (cmd) {
case 'c':
Database_create(conn);
Database_write(conn);
break;
case 'd':
Database_delete(conn, id);
Database_write(conn);
break;
case 'g':
Database_get(conn, id);
break;
case 'h':
help();
break;
case 'l':
Database_list(conn);
break;
case 'o':
conn = Database_open(filename, action);
break;
case 's':
Database_set(conn, id, name, email);
Database_write(conn);
break;
case 'q': goto exit;
default: break;
}
}
exit:
return 0;
}
int main(int argc, char *argv[])
{
if(argc < 3) die("USAGE: mydb <dbfile> <action> [action params]");
char *filename=argv[1];
char action = argv[2][0];
// will open file. Only creates file if action is 'c'
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 '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;
}
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];
int id = 0;
char *email;
if (action == 'c') {
if (argc != 5) {
die("Need max_rows and max_data");
}
max_rows = atoi(argv[3]);
max_data = atoi(argv[4]);
}
Database_open(filename, action);
if(action != 'c' && argc > 3) {
if (action != 'f') {
id = atoi(argv[3]);
} else {
email = argv[3];
}
}
if(id >= max_rows) die("There's not that many records.");
switch(action) {
case 'c':
//Database_create();
Database_write();
break;
case 'g':
if(argc != 4) die("Need an id to get");
Database_get(id);
break;
case 'f':
if (argc != 4) die("Need email to find");
Database_find(email);
break;
case 's':
if(argc != 6) die("Need id, name, email to set");
Database_set(id, argv[4], argv[5]);
Database_write();
break;
case 'd':
if(argc != 4) die("Need id to delete");
Database_delete(id);
Database_write();
break;
case 'l':
Database_list();
break;
default:
die("Invalid action, only: c=create, g=get, f=find, s=set, d=del, l=list");
}
Database_close();
return 0;
}
void Database_create(struct Connection * connection) {
int i = 0;
for(i = 0; i < MAX_ROWS; i++) {
struct Address addr = { .id = i, .set = 0 };
connection->db->rows[i] = addr;
}
}
void Database_set(struct Connection * connection, int id, const char * name, const char * email) {
struct Address *address = &connection->db->rows[id];
if(address->set) die("Already set. Delete it first.");
address->set = 1;
// Warning BUG
char * res = strncpy(address->name, name, MAX_DATA);
// Demonstrate strncpy bug
if(!res) die("Name copy failed");
res = strncpy(address->email, email, MAX_DATA);
if(!res) die("Email copy failed");
}
void Database_get(struct Connection * connection, int id) {
struct Address * address = &connection->db->rows[id];
if(address->set) {
Address_print(address);
} else {
die("ID is not set");
}
}
void Database_delete(struct Connection * connection, int id) {
struct Address address = { .id = id, .set = 0 };
connection->db->rows[id] = address;
}
void Database_list(struct Connection * connection) {
int i = 0;
struct Database * db = connection->db;
for(i = 0; i < MAX_ROWS; i++) {
struct Address * current = &db->rows[i];
if(current->set) Address_print(current);
}
}
int main(int argc, char * argv[]) {
if(argc < 3) die("USAGE: ex17 <db_file> <action> [action params]");
char * filename = argv[1];
char action = argv[2][0];
struct Connection * connection = 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(connection);
Database_write(connection);
break;
case 'g':
if(argc != 4) die("Need an id to get");
Database_get(connection, id);
break;
case 's':
if(argc != 6) die("Need id, name, and email to set");
Database_set(connection, id, argv[4], argv[5]);
Database_write(connection);
break;
case 'd':
if(argc != 4) die("Need id to delete");
Database_delete(connection, id);
Database_write(connection);
break;
case 'l':
Database_list(connection);
break;
default:
die("Invalid action. Only: c=create, g=get, s=save, d=delete, l=list");
}
Database_close(connection);
return 0;
}
void Database_create(struct Connection *conn)
{
int i = 0;
for(i = 0; i < MAX_ROWS; i++){
//Make a prototype
struct Address addr = {.id = i, .set = 0};
conn->db->rows[i] = addr;
}
}
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!");
addr->set = 1;
char *res = strncpy(addr->name, name, MAX_DATA);
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 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 *curr = &db->rows[i];
if(curr->set){
Address_print(curr);
}
}
}
int main(int argc, char *argv[]){
if(argc < 3) die("USAGE: heapstack <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("Not enough records");
switch(action) {
case 'c':
Database_create(conn);
Database_write(conn);
break;
case 'g':
if(argc != 4) die("Need an id");
Database_get(conn, id);
break;
case 's':
if(argc != 6) die("Need id, name and email");
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
if(argc != 4) die("Need an id");
Database_delete(conn,id);
Database_write(conn);
break;
case 'l':
Database_list(conn);
break;
default:
die("Invalid action");
break;
}
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 it
struct Address addr = {.id = i, .set = 0};
// then just assign it
conn->db->rows[i] = addr;
}
}
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");
/* &conn->db->rows[i]
reads "get the i element of rows, which is in db, which is in conn, then get the address of (&) it */
addr->set = 1;
// WARNING: bug, read the "How To Break It" and fix this
char *res = strncpy(addr->name, name, MAX_DATA);
// demonstrate the 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;
// This trick makes sure that all fields but set and id are initialized to 0s
// and is actually easier to write.
// The dot before the fieldname is for giving initial values to struct members at declaration
}
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;
// The atoi is to take the string for the id on the command line and convert it to the int id variable
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;
}
void Database_create(struct Connection *conn) {
int i = 0;
for(i=0; i < MAX_ROWS; i++) {
struct Contact c = { .id = i, .set = 0 };
conn->db->rows[i] = c;
}
}
void Database_set(struct Connection *conn, int id, const char *name, const char *email) {
struct Contact *c = &conn->db->rows[id]; // TODO: what does the & do to a struct pointer?
if(c->set) die("Contact already set, delete it first");
c->set = 1;
// WARNING: bug, read the "How To Break It" and fix this
char *res = strncpy(c->name, name, MAX_DATA);
if(!res) die("Name copy failed");
res = strncpy(c->email, email, MAX_DATA);
if(!res) die("Email copy failed");
}
void Database_get(struct Connection *conn, int id) {
struct Contact *c = &conn->db->rows[id];
if(c->set) {
Contact_print(c);
} else {
die("ID not set");
}
}
void Database_delete(struct Connection *conn, int id) {
struct Contact c = { .id = id, .set = 0 };
conn->db->rows[id] = c;
}
void Database_list(struct Connection *conn) {
int i = 0;
struct Database *db = conn->db;
for(i = 0; i < MAX_ROWS; i++) {
struct Contact *cursor = &db->rows[i];
if(cursor->set) {
Contact_print(cursor);
}
}
}
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;
}
void Database_create(struct Connection *conn) {
int i = 0;
for (i = 0; i < MAX_ROWS; i++) {
// make a prototype to initialize it
struct Address addr = {.id = i, .is_set = false};
// then just assign it
conn->db->rows[i] = addr;
}
}
void Database_set(struct Connection *conn, int id, const char *name, const char *email) {
struct Address *addr = &conn->db->rows[id];
if (addr->is_set) {
die(conn, "Already set, delete it first");
}
addr->is_set = true;
// WARNING: bug, read the "How To Break It" and fix this
// demonstrate the strncpy bug (Not an undocumented 'bug', but maybe poor design)
// if name is as long or longer than MAX_DATA, strncpy won't set the last character null.
// http://randomascii.wordpress.com/2013/04/03/stop-using-strncpy-already/
// http://stackoverflow.com/questions/14950241/pointer-to-one-struct-in-another-writing-and-reading-it-from-file-gives-segfaul
char *res = strncpy(addr->name, name, MAX_DATA);
// Ensure last character is null.
addr->name[sizeof(addr->name) - 1] = '\0';
if (!res) {
die(conn, "Name copy failed");
}
res = strncpy(addr->email, email, MAX_DATA);
// Ensure last character is null.
addr->email[sizeof(addr->email) - 1] = '\0';
if (!res) {
die(conn, "Email copy failed");
}
}
void Database_get(struct Connection *conn, int id) {
struct Address *addr = &conn->db->rows[id];
if (addr->is_set) {
Address_print(addr);
} else {
die(conn, "ID is not set");
}
}
void Database_delete(struct Connection *conn, int id) {
// set id and is_set
// don't set name or email, this initializes them to zero.
struct Address addr = {.id = id, .is_set = false};
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->is_set) {
Address_print(cur);
}
}
}
int main(int argc, char *argv[]) {
if (argc < 3) {
die(NULL, "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) {
// atoi converts string to integer
id = atoi(argv[3]);
}
if (id >= MAX_ROWS) {
die(conn, "There's not that many records.");
}
switch (action) {
case 'c':
Database_create(conn);
Database_write(conn);
break;
case 'g':
if (argc != 4) {
die(conn, "Need an id to get");
}
Database_get(conn, id);
break;
case 's':
if (argc != 6) {
die(conn, "Need id, name, email to get");
}
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
if (argc != 4) {
die(conn, "Need id to delete");
}
Database_delete(conn, id);
Database_write(conn);
break;
case 'l':
Database_list(conn);
break;
default:
die(conn, "Invalid action, only: c=create, g=get, s=set, d=delete, l=list");
}
Database_close(conn);
return 0;
}
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;
int id;
switch(action) {
case 'c':
conn = Database_open(filename, action);
Database_create(conn);
Database_write(conn);
break;
case 'f':
if(argc != 4) die("Need a name to find");
conn = Database_open(filename, action);
Database_find_name(conn, argv[3]);
Database_close(conn);
break;
case 'g':
if(argc > 3) id = atoi(argv[3]);
if(id >= MAX_ROWS) die("The are already too many records.");
if(argc != 4) die("Need an ID to get");
conn = Database_open(filename, action);
Database_get(conn, id);
Database_close(conn);
break;
case 'a':
if(argc > 3) id = atoi(argv[3]);
//if(argc != 5) die("Need name, and email to set.");
conn = Database_open(filename, action);
Database_add(conn, argv[4], argv[5]);
Database_write(conn);
Database_close(conn);
break;
case 's':
if(argc > 3) id = atoi(argv[3]);
if(id >= MAX_ROWS) die("The are already too many records.");
if(argc != 6) die("Need id, name, and email to set.");
conn = Database_open(filename, action);
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
Database_close(conn);
break;
case 'd':
if(argc > 3) id = atoi(argv[3]);
if(id >= MAX_ROWS) die("The are already too many records.");
if(argc != 4) die("Need an ID to delete");
conn = Database_open(filename, action);
Database_delete(conn, id);
Database_write(conn);
Database_close(conn);
break;
case 'l':
conn = Database_open(filename, action);
Database_list(conn);
Database_close(conn);
break;
case 'u':
if(argc > 3) id = atoi(argv[3]);
if(id >= MAX_ROWS) die("The are already too many records.");
if(argc != 6) die("Need id, name, and email to set.");
conn = Database_open(filename, action);
Database_update(conn, id, argv[4], argv[5]);
Database_write(conn);
Database_close(conn);
break;
case 'z':
conn = Database_open(filename, action);
printf("%d\n", Database_nrows(conn));
Database_close(conn);
break;
default:
die("Invalid action, only: c=create, a=add, g=get, f=find, s=set, d=delete, l=list, u=update, z=size");
break;
}
return 0;
}
//Database handler. UI
int main(int argc, char* argv[]){
if(argc<3){
die("USAGE: ex17 <dbfile> <action> [action params]", NULL);
}
char* filename = argv[1];
char action = argv[2][0];
struct Connection* conn = Database_open(filename, action);
int id = 0;
if(argc>3 && action != 'f'){
id = atoi(argv[3]);
}
if(id > MAX_ROWS){
die("There's not that many records.", conn);
}
switch(action){
case 'c':
Database_create(conn);
Database_write(conn);
break;
case 'g':
if(argc!=4){
die("Need an id to get.", conn);
}
Database_get(conn, id);
break;
case 's':
if(argc != 6){
die("Need id, name, email to set.", conn);
}
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
if(argc < 4){
die("Need id to delete.", conn);
}
Database_delete(conn, id);
Database_write(conn);
break;
case 'l':
Database_list(conn);
break;
case 'f':
if(argc!=4)
die("Need name to look for.", conn);
Database_find(conn, argv[3]);
break;
default:
die("Invalid action. Only c=create, g=get, s=set, d=delete and l=list are valid actions.", conn);
}
Database_close(conn);
return 0;
}
void Database_create(struct Connection *conn) {
int i = 0;
for (i = 0; i < MAX_ROWS; i++) {
struct Address addr = { .id = i, .set = 0};
conn->db->rows[i] = addr;
}
}
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("Record already set - delete first", conn);
}
addr->set = 1;
char *res = strncpy(addr->name, name, MAX_DATA);
if (!res) {
die("name copy failed", conn);
}
res = strncpy(addr->email, email, MAX_DATA);
if (!res) {
die("email copy failed", conn);
}
}
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", conn);
}
}
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 *addr = &db->rows[i];
if (addr->set) {
Address_print(addr);
printf("\n");
}
}
}
void die(const char *message, struct Connection *conn) {
if (errno) {
perror(message);
} else {
printf("ERROR %s\n", message);
}
Database_close(conn);
exit(1);
}
int main(int argc, char *argv[]) {
if (argc < 3) {
die("USAGE: simple-database <dbfile> <action> [action params]", NULL);
}
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("ID exceeds maximum database capacity", conn);
}
switch(action) {
case 'c':
Database_create(conn);
Database_write(conn);
break;
case 'g':
if (argc != 4) {
die("An ID is required for the get operation", conn);
}
Database_get(conn, id);
break;
case 's':
if (argc != 6) {
die("Need an ID, name, and email for the set operation", conn);
}
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
if (argc != 4) {
die("Need an ID to delete", conn);
}
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", conn);
}
Database_close(conn);
return 0;
}
/*
* === FUNCTION ======================================================================
* Name: Database_create
* Description:
* =====================================================================================
*/
void
Database_create ( struct Connection*conn )
{
int i=0;
for(i=0;i<MAX_ROWS;i++){
struct Address addr = { .id=i, .set=0 };
conn->db->rows[i] = addr;
}
} /* ----- end of function Database_create ----- */
/*
* === FUNCTION ======================================================================
* Name: Database_set
* Description:
* =====================================================================================
*/
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;
char *res = strncpy(addr->name, name, MAX_DATA);
if(strlen(addr->name) >= MAX_DATA)
printf("WARNING:length_error\n");
res[MAX_DATA-1] = '\0';
if(!res) die("Name copy failed");
printf("name is %s\n", addr->name);
char* eres = strncpy(addr->email, email, MAX_DATA);
if(!eres) die("Email copy failed");
if(strlen(addr->email) >= MAX_DATA)
printf("WARNING:length_error\n");
eres[MAX_DATA-1] ='\0';
printf("email is %s\n", addr->email);
} /* ----- end of function Database_set ----- */
/*
* === FUNCTION ======================================================================
* Name: Database_get
* Description:
* =====================================================================================
*/
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");
}
} /* ----- end of function Database_get ----- */
/*
* === FUNCTION ======================================================================
* Name: Database_delete
* Description:
* =====================================================================================
*/
void
Database_delete ( struct Connection *conn, int id )
{
struct Address addr = {.id = id, .set=0};
conn->db->rows[id] = addr;
} /* ----- end of function Database_delete ----- */
/*
* === FUNCTION ======================================================================
* Name: Database_list
* Description:
* =====================================================================================
*/
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);
}
}
} /* ----- end of function Database_list ----- */
#include <stdlib.h>
/*
* === FUNCTION ======================================================================
* Name: main
* Description:
* =====================================================================================
*/
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];
// printf("mode is %c" ,action);//
// printf("filename is %s", filename);//
struct Connection *conn = Database_open(filename,action);
int id=0;
if(argc > 3)id=atoi(argv[3]);
if(id >= MAX_ROWS) die("this is not that many record");
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 EXIT_SUCCESS;
} /* ---------- end of function main ---------- */
void Database_create(struct Connection *conn)
{
for(int i = 0; i < MAX_ROWS; i++)
{
struct Address addr = { .id = i, .set = 0 };
conn->db->rows[i] = addr;
}
}
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;
//This copies at most MAX_DATA bytes from name to addr->name.
//If the length of name is less than MAX_DATA, the remaining
//chars are nulled out until MAX_DATA is reached.
//Note that if name is greater than or equal to MAX_DATA,
//only MAX_DATA bytes are copied, but no room is left for a null terminator.
//Therefore, some memory disclosure may occur after the allocated
//memory for addr->name, depending on the next null byte.
//This applies equally for the email copying below.
char *res = strncpy(addr->name, name, MAX_DATA);
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 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)
{
struct Database *db = conn->db;
for(int i = 0; i < MAX_ROWS; i++)
{
struct Address *addr = &db->rows[i];
if(addr->set)
Address_print(addr);
}
}
int main(int argc, char *argv[])
{
if(argc < 3)
die("USAGE: ex17 <dbfile> <action> [action parameters].");
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 are 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 an ID, Name, and Email to set.");
}
Database_set(conn, id, argv[4], argv[5]);
Database_write_record(conn, id);
break;
case 'd':
if(argc != 4)
{
die("Need an ID to delete.");
}
Database_delete(conn, id);
Database_write_record(conn, id);
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;
}
int main(int argc, char *argv[])
{
struct Connection *conn = NULL;
if (argc < 3)
die("USAGE: ex17 <dbfile> <action> [action params]", conn);
char *filename = argv[1];
char action = argv[2][0];
conn = Database_open(filename, action);
int id = 0;
if (argc > 3) id = atoi(argv[3]);
if (action != 'c') {
if (id >= MAX_ROWS)
die("There's not that many records.", conn);
}
switch (action) {
case 'c':
Database_create(conn);
Database_write(conn);
break;
case 'g':
if (argc != 4)
die("Need an id to get", conn);
Database_get(conn, id);
break;
case 's':
if (argc != 6)
die("Need id, name, email to set", conn);
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
if (argc != 4)
die("Need id to delete", conn);
Database_delete(conn, id);
Database_write(conn);
break;
case 'l':
Database_list(conn);
break;
case 'f':
if (argc != 4)
die("Need to provide a string to search matches.", conn);
Database_find(conn, argv[3]);
break;
default:
die("Invalid action: c=create, g=get, s=set, d=del, l=list", conn);
}
Database_close(conn);
return 0;
}
void Database_create(struct Connection *conn, int max_data, int max_rows)
{
conn->db->max_data = max_data;
conn->db->max_rows = max_rows;
conn->db->rows = malloc(sizeof(struct Address[max_rows]));
if(!conn->db->rows) die("Memory error", conn);
int i = 0;
for(i = 0; i < max_rows; i++) {
// make a prototype to initialize it
struct Address addr = {
.id = i,
.set = 0,
.name = malloc(sizeof(char [max_data])),
.email = malloc(sizeof(char [max_data])),
};
// then just assign it
conn->db->rows[i] = addr;
}
}
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", conn);
addr->set = 1;
// WARNING: bug, read the "How To Break It" and fix this
char *res = strncpy(addr->name, name, conn->db->max_data);
// demonstrate the strncpy bug
if(!res) die("Name copy failed", conn);
res = strncpy(addr->email, email, conn->db->max_data);
if(!res) die("Email copy failed", conn);
}
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", conn);
}
}
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 < conn->db->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]", NULL);
char *filename = argv[1];
char action = argv[2][0];
struct Connection *conn = Database_open(filename, action);
int id = 0;
switch(action) {
case 'c':
if(argc != 5) die("Need to specify max data and max rows", conn);
int max_data = atoi(argv[3]);
int max_rows = atoi(argv[4]);
Database_create(conn, max_data, max_rows);
Database_write(conn);
break;
case 'g':
if(argc > 3) id = atoi(argv[3]);
if(id >= conn->db->max_rows) die("There's not that many records.", conn);
if(argc != 4) die("Need an id to get", conn);
Database_get(conn, id);
break;
case 's':
if(argc > 3) id = atoi(argv[3]);
if(id >= conn->db->max_rows) die("There's not that many records.", conn);
if(argc != 6) die("Need id, name, email to set", conn);
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
if(argc > 3) id = atoi(argv[3]);
if(id >= conn->db->max_rows) die("There's not that many records.", conn);
if(argc != 4) die("Need id to delete", conn);
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", conn);
}
Database_close(conn);
return 0;
}
void Database_create(struct Connection *conn) //create database
{
int i = 0;
for (i = 0; i < MAX_ROWS; i++) { //for the maximum number of rows
// make a prototype to initialize it
struct Address addr = {.id = i, .set = 0};
// then just assign it
conn->db->rows[i] = addr;
}
}
void Database_set(struct Connection *conn, int id, const char *name, const char *email)
{
struct Address *addr = &conn->db->rows[id]; //get the i element of rows, which is in db, which is in conn, then get the address of the above
if(addr->set) die("Already set, delete it first.");
addr->set = 1;
char *res = strncpy(addr->name, name, MAX_DATA);
// just fix prinf in address call, far easier
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) //fetch the database with a certain id
{
struct Address *addr = &conn->db->rows[id];
if(addr->set){
Address_print(addr); //print address
} else {
die("ID is not set.");
}
}
void Database_delete(struct Connection *conn, int id) //this function deletes the database
{
struct Address addr = {.id = id, .set = 0}; //set temporary local address tonull
conn->db->rows[id] = addr;
}
void Database_list(struct Connection *conn) //list the databases
{
int i = 0;
struct Database *db = conn->db; //new pointer
for(i = 0; i < MAX_ROWS; i++) {
struct Address *cur = &db->rows[i]; //set the rows to the address of db
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]; //our filename
char action = argv[2][0];
struct Connection *conn = Database_open(filename, action); //open a database
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;
}
void Database_create(struct Connection *conn, int max_rows, int max_data)
{
conn->db->max_rows = max_rows;
conn->db->max_data = max_data;
Database_alloc_rows(conn);
int i = 0;
for(i = 0; i < max_rows; i++) {
struct Address addr = { .id = i, .set = 0};
addr.email = malloc(sizeof(char) * conn->db->max_data);
addr.name = malloc(sizeof(char) * conn->db->max_data);
conn->db->rows[i] = addr;
}
}
struct Connection *Database_open(const char *filename, char mode)
{
struct Connection *conn = malloc(sizeof(struct Connection));
if(!conn) die("Memory error", conn);
conn->db = malloc(sizeof(struct Database));
if(!conn->db) die("Memory error", conn);
if(mode == 'c') {
conn->file = fopen(filename, "w");
} else {
conn->file = fopen(filename, "r+");
if(conn->file) {
Database_load(conn);
}
}
if(!conn->file) die("Failed to open the file", conn);
return conn;
}
void Database_close(struct Connection *conn)
{
if(conn) {
if(conn->file) fclose(conn->file);
if(conn->db->rows) free(conn->db->rows);
if(conn->db) free(conn->db);
free(conn);
}
}
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", conn);
addr->set = 1;
//WARNING: bug, read the "How to break it" and fix this
char *res = strncpy(addr->name, name, conn->db->max_data);
//demonstrate the strncpy bug
if(!res) die("Name copy failed", conn);
res = strncpy(addr->email, email, conn->db->max_data);
if(!res) die("Email copy failed", conn);
}
void Database_get(struct Connection *conn, int id)
{
if(id > conn->db->max_rows) {
die("There's not that many rows", conn);
}
struct Address *addr = &conn->db->rows[id];
if(addr->set) {
Address_print(addr);
} else {
die("ID not set", conn);
}
}
void Database_delete(struct Connection *conn, int id) {
struct Address addr = {.id = id, .set = 0};
addr.email = malloc(sizeof(char) * conn->db->max_data);
addr.name = malloc(sizeof(char) * conn->db->max_data);
conn->db->rows[id] = addr;
}
void Database_list(struct Connection *conn)
{
int i = 0;
for(i=0; i< conn->db->max_rows; i++) {
struct Address *cur = &(conn->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]", NULL);
char *filename = argv[1];
char action = argv[2][0];
struct Connection *conn = Database_open(filename, action);
int param1 = 0;
int param2 = 0;
int max_rows = 100;
int max_data = 512;
if(argc > 3) {
param1 = atoi(argv[3]);
}
if(argc > 4) {
param2 = atoi(argv[4]);
}
switch(action) {
case 'c':
if(argc > 3) {
max_rows = param1;
}
if(argc > 4) {
max_data = param2;
}
Database_create(conn, max_rows, max_data);
Database_write(conn);
break;
case 'g':
if(argc != 4) die("Need an id to get", conn);
Database_get(conn, param1);
break;
case 's':
if(argc != 6) die("Need id, name, email to set", conn);
Database_set(conn, param1, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
if(argc != 4) die("Need an id to delete", conn);
Database_delete(conn, param1);
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", conn);
}
Database_close(conn);
return 0;
}
void Database_create(struct Connection *conn)
{
int i = 0;
for (i = 0; i < MAX_ROWS; i++) {
struct Address addr = {.id = i, .set = 0};
conn->db->rows[i] = addr;
};
};
void Database_delete(struct Connection *conn, int id)
{
struct Address addr = {.id = id, .set = 0};
conn->db->rows[id] = addr;
};
void Database_set(struct Connection *conn, int id, const char *restrict name, const char *restrict email)
{
struct Address *restrict addr = &conn->db->rows[id];
if(addr->set) {
die("Already set, delete it first");
};
addr->set = 1;
char *res = strncpy(addr->name, name, MAX_DATA);
addr->name[ sizeof(name) - 1 ] = '\0';
if(!res) {
die("Name copy failed.");
};
char *res1 = strncopy(addr->email, email, MAX_DATA);
addr->email[ sizeof(email) - 1 ] = '\0';
if(!res1) {
die("Email copy failed");
};
};
void Database_get(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);
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;
};
int main(int argc, char *argv[])
{
if (argc < 3) die("USAGE: ex17 <dbfile> <action> [action params]", NULL);
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.", NULL);
switch (action) {
case 'c':
Database_create(conn);
Database_write(conn);
break;
case 'g':
if (argc !=4) die("Need an id to get.", NULL);
Database_get(conn, id);
break;
case 's':
if (argc != 6) die("Need id, name, email to set.", NULL);
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
if (argc != 4) die("Need id to delete.", NULL);
Database_delete(conn, id);
Database_write(conn);
break;
case 'f':
if (argc != 5) die("Need attribute, value to find", NULL);
char attribute = argv[3][0];
char *value = argv[4];
if (attribute == 'e') {
Database_find_email(conn, value);
} else {
Database_find_name(conn, value);
}
break;
case 'l':
Database_list(conn);
break;
default:
die("Invalid action, only: c=create, g=get, f=find, s=set, d=del, l=list.",
NULL);
}
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 data to address
struct Address addr = {.id = i, .set = 0};
//assign address rows to the db
conn->db->rows[i] = addr;
}
}
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 row first");
addr->set = 1;
// Warning: bug, read the how to break and fix this
char *res = strncpy(addr->name, name, MAX_DATA);
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 *addr = &db->rows[i];
if (addr->set){
Address_print(addr);
}
}
}
int main (int argc, char *argv[])
{
if (argc < 3) die ("Too less argument for setting up db: 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("Too many records to open. There are 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 open the record");
Database_get(conn, id);
break;
case 's':
if (argc != 6) die ("Need id email and name 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=Delete, l=List commands are available");
}
Database_close(conn);
return 0;
}
void Database_create(struct Connection *conn,
int max_rows, int max_data)
{
printf("Creating database...\n");
int i = 0;
for(i = 0; i < max_rows; i++) {
// Make a prototype to initialize it:
struct Address addr = {.id = i, .set = 0};
// ...then set it:
conn->db->rows[i] = addr;
}
printf("Database created.\n");
}
void Database_set(struct Connection *conn, int id,
const char *name, const char *email)
{
//printf("Setting DB entry...\n");
struct Address *addr = &conn->db->rows[id];
if(addr->set)
die(conn, "DB Address already set, delete it first.");
// WARNING: This a bug:
char *res = strncpy(addr->name, name, conn->db->max_data);
// Demonstrate the strncopy bug:
if(!res)
die(conn, "Name copy failed.");
res = strncpy(addr->email, email, conn->db->max_data);
if(!res)
die(conn, "Email copy failed.");
addr->set = 1;
//printf("DB entry set\n");
}
void Database_get(struct Connection *conn, int id)
{
struct Address *addr = &conn->db->rows[id];
if(addr->set) {
Address_print(addr);
} else {
die(conn, "DB Address is not set");
}
printf("DB entry got\n");
}
void Database_delete(struct Connection *conn, int id)
{
struct Address addr = {.id = id, .set = 0};
conn->db->rows[id] = addr;
printf("DB entry deleted\n");
}
void Database_list(struct Connection *conn)
{
printf("Printing Database...\n");
int i = 0;
struct Database *db = conn->db;
for(i = 0; i < db->max_rows; i++) {
struct Address *cur = &db->rows[i];
if(cur->set) {
//printf("Is set!");
Address_print(cur);
}
//printf("Is not set!");
}
printf("...Database printed.\n");
}
void Database_find(struct Connection *conn, char *target)
{
struct Database *db = conn->db;
struct Address *addr;
int i;
printf("Finding %s...\n", target);
for(i = 0; i < db->max_rows; i++) {
addr = &db->rows[i];
if(addr->set == 1) {
if(strstr(addr->name, target) || strstr(addr->email, target))
Address_print(addr);
}
}
printf("All results found.\n");
}
int main(int argc, char* argv[])
{
if(argc < 3)
die(NULL, "USAGE: ex17 <dbfile> <action> [action params]");
char* filename = argv[1];
char action = argv[2][0];
struct Connection* conn;
if(action == 'c')
conn = Database_open(filename, action,
atoi(argv[3]), atoi(argv[4]));
else
conn = Database_open(filename, action, 0, 0);
int id = 0;
switch(action) {
case 'c':
if(argc != 5)
die(conn, "Incorrect params.");
Database_create(conn, atoi(argv[3]), atoi(argv[4]));
Database_write(conn);
break;
case 'g':
id = atoi(argv[3]);
if(id > conn->db->max_rows)
die(conn, "ID is greater than number of records.");
if(argc != 4)
die(conn, "Need ID to get.");
Database_get(conn, id);
break;
case 's':
id = atoi(argv[3]);
if(id > conn->db->max_rows)
die(conn, "ID is greater than number of records.");
if(argc != 6)
die(conn, "Need ID, name and email to set.");
Database_set(conn, id, argv[4], argv[5]);
Database_write(conn);
break;
case 'd':
id = atoi(argv[3]);
if(id > conn->db->max_rows)
die(conn, "ID is greater than number of records.");
if(argc != 4)
die(conn, "Need ID to delete.");
Database_delete(conn, id);
Database_write(conn);
break;
case 'l':
Database_list(conn);
break;
case 'f':
Database_find(conn, argv[3]);
break;
default:
die(conn,
"Invalid action. c=create, g=get, s=set, d=delete, s=set, f=find.");
}
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 it
struct Address addr = {.id = i, .set = 0};
// then just assign it
conn->db->rows[i] = addr;
}
}
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: bug, read the "How To Break It" and fix it
char *res = strncpy(addr->name, name, MAX_DATA);
// demonstrate the 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");
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;
}
void Database_create(struct Connection *conn)
{
int i = 0;
for(i = 0; i < MAX_ROWS; i++) {
//Initizalize Database
struct Users user = {.id = i, .set = 0};
// Assign database
conn->db->rows[i] = user;
}
}
void Database_set(struct Connection *conn, int id, const char *username, const char *password)
{
struct Users *user = &conn->db->rows[id];
if(user->set) die("Already set, delete it first");
user->set = 1;
//we have to find a better way to do this rather than strncpy
char *res = strncpy(user->username, username, MAX_DATA);
if(!res) die("Username copy failed");
res = strncpy(user->password, password, MAX_DATA);
if(!res) die("Password copy failed");
}
void Database_get(struct Connection *conn, int id)
{
struct Users *user = &conn->db->rows[id];
if(user->set) {
Users_print(user);
} else {
die("ID is not set");
}
}
void Database_delete(struct Connection *conn, int id)
{
struct Users user = {.id = id, .set = 0};
conn->db->rows[id] = user;
}
void Database_list(struct Connection *conn)
{
int i = 0;
struct Database *db = conn->db;
for(i = 0; i < MAX_ROWS; i++) {
struct Users *cur = &db->rows[i];
if(cur->set) {
Users_print(cur);
}
}
}
int main(int argc, char *argv[])
{
if(argc < 3) die("USAGE: Database <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, username, password 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;
}