Beispiel #1
0
void DatabaseCreate(struct Connection *conn){
  for (int i=0; i < MAX_ROWS; i++){
    struct Address addr = {.id = i, .set = 0};
    conn->db->rows[i] = addr;
  }
}

void DatabaseSet(struct Connection *conn, int id, const char *name, const char *email){
  struct Address *addr = &conn->db->rows[id];
  if(addr->set) die("Allready set, delete it first");

  addr->set = 1;
  char *res = strncpy(addr->name, name, MAX_DATA);
  if (!res) die("Name copy fialed");

  res = strncpy(addr->email, email, MAX_DATA);
  if (!res) die("Email copy failed");
}

void DatabaseGet(struct Connection *conn, int id){
  struct Address *addr = &conn->db->rows[id];

  if(addr->set){
    AddressPrint(addr);
  } else {
    die("ID is not set");
  }
}

void DatabaseDelete(struct Connection *conn, int id){
  struct Address addr = {.id = id, .set = 0};
  conn->db->rows[id] = addr;
}

void DatabaseList(struct Connection *conn){
  struct Database *db = conn->db;

  for (int i=0; i<MAX_ROWS; i++){
    struct Address *cur = &db->rows[i];

    if(cur->set){
      AddressPrint(cur);
    }
  }
}

int main(int argc, char *argv[]){
  if(argc < 3) die("USAGE: ext17 <dbfile> <action> [action params]");

  char *filename = argv[2];
  char action = argv[1][0];
  struct Connection *conn = DatabaseOpen(filename, action);
  int id = 0;

  if(argc > 3) id = atoi(argv[3]);
  if(id >= MAX_ROWS) die("There is not that many records.");

  switch(action){
    case 'c':
      DatabaseCreate(conn);
      DatabaseWrite(conn);
      break;
    case 'g':
      if (argc != 4) die("Need an id to get");
      DatabaseGet(conn, id);
      break;
    case 's':
      if(argc != 6) die("Need id, name, email to set.");
      DatabaseSet(conn, id, argv[4], argv[5]);
      DatabaseWrite(conn);
      break;
    case 'd':
      if(argc != 4) die("Need id to delete");
      DatabaseDelete(conn, id);
      DatabaseWrite(conn);
      break;
    case 'l':
      DatabaseList(conn);
      break;
    default: 
      die("Invalid action:\nc=create\ng=get\ns=set\nd=del\nl=list");
  }

  DatabaseClose(conn);

  return 0;
}
Beispiel #2
0
void DatabaseCreate(struct Connection* conn )
{
	int i = 0;

	for(i = 0; i < MAX_ROWS; i++)
	{
		//make a prototype to initialise it
		struct Address addr = {.id = i, .set =0};
		//then just assign it
		conn->db->rows[i] = addr;
	}
}

void DatabaseSet(struct Connection* conn, int id, const char* name, const char* email)
{
	struct Address* addr = &conn->db->rows[id];
	if(addr->set) Die("Already set, deleted it first!", conn);

	addr->set =1;
	//WARNING: bug, read the "How to break it" section and fix this
	char* res = strncpy(addr->name,name,MAX_DATA);
	//demonstrate the strncpy bug
	if(!res) Die("Name copy failed", conn);

	res = strncpy(addr->email,email,MAX_DATA);
	if(!res) Die("Email copy failed", conn);
}

void DatabaseGet(struct Connection* conn, int id)
{
	struct Address* addr = &conn->db->rows[id];

	if(addr->set)
	{
		AddressPrint(addr);
	}
	else
	{
		Die("Id is not set.", conn);
	}
}

void DatabaseDelete(struct Connection* conn, int id)
{
	struct Address addr = {.id = id, .set = 0};
	conn->db->rows[id] = addr;
}

void DatabaseList(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) AddressPrint(cur);
	}
}

int main(int argc, char* argv[])
{
	if(argc<3) Die("USAGE: ex17 <dbfile> <action> [action params]", conn);

	char* filename = argv[1];
	char action = argv[2][0];
	struct Connection* conn = DatabaseOpen(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':
			DatabaseCreate(conn);
			DatabaseWrite(conn);
			break;

		case 'g':
			if(argc != 4) Die("Need an id to get", conn);

			DatabaseGet(conn, id);
			break;

		case 's':
			if(argc != 6) Die("Need id, name, email to set.", conn);

			DatabaseSet(conn, id, argv[4], argv[5]);
			DatabaseWrite(conn);
			break;

		case 'd':
			if(argc != 4) Die("Need id to delete", conn);

			DatabaseDelete(conn, id);
			DatabaseWrite(conn);
			break;

		case 'l':
			DatabaseList(conn);
			break;
		default:
			Die("Invalid action, only: c=create, g=get, s=set, d=del, l=list", conn);
	}//end switch action

	DatabaseClose(conn);

	return 0;
}//end main