#include
#include
#include
#include
#include
#include
#include "hacking.h"
#define DATAFILE "/var/chance.data" // File to store user data
// Custom user struct to store information about users
struct user {
int uid;
int credits;
int highscore;
char name[100];
int (*current_game) ();
};
// function prototypes
int get_player_data();
void register_new_player();
void update_player_data();
void show_highscore();
void jackpot();
void input_name();
void print_cards(char *, char *, int);
int take_wager(int, int);
void play_the_game();
int pick_a_number();
int dealer_no_match();
int find_the_ace();
void fatal(char *);
// Global variables
struct user player; // Player struct
int main() {
int choice, last_game;
srand(time(0)); // Seed the randomizer with the current time.
if(get_player_data() == -1) // Try to read player data from file.
register_new_player(); // If there is no data, register a new player.
while(choice != 7) {
printf("-=[ Game of Chance Menu ]=-\n");
printf("1 - Play the Pick a Number game\n");
printf("2 - Play the No Match Dealer game\n");
printf("3 - Play the Find the Ace game\n");
printf("4 - View current high score\n");
printf("5 - Change your user name\n");
printf("6 - Reset your account at 100 credits\n");
printf("7 - Quit\n");
printf("[Name: %s]\n", player.name);
printf("[You have %u credits] -> ", player.credits);
scanf("%d", &choice);
if((choice < 1) || (choice > 7))
printf("\n[!!] The number %d is an invalid selection.\n\n", choice);
else if (choice < 4) { // Othewise, choice was a game of some sort.
if(choice != last_game) { // If the function ptr isn't set
if(choice == 1) // then point it at the selected game
player.current_game = pick_a_number;
else if(choice == 2)
player.current_game = dealer_no_match;
else
player.current_game = find_the_ace;
last_game = choice; // and set last_game.
}
play_the_game(); // Play the game.
}
else if (choice == 4)
show_highscore();
else if (choice == 5) {
printf("\nChange user name\n");
printf("Enter your new name: ");
input_name();
printf("Your name has been changed.\n\n");
}
else if (choice == 6) {
printf("\nYour account has been reset with 100 credits.\n\n");
player.credits = 100;
}
}
update_player_data();
printf("\nThanks for playing! Bye.\n");
}
// This function reads the player data for the current uid
// from the file. It returns -1 if it is unable to find player
// data for the current uid.
int get_player_data() {
int fd, uid, read_bytes;
struct user entry;
uid = getuid();
fd = open(DATAFILE, O_RDONLY);
if(fd == -1) // Can't open the file, maybe it doesn't exist
return -1;
read_bytes = read(fd, &entry, sizeof(struct user)); // Read the first chunk.
while(entry.uid != uid && read_bytes > 0) { // Loop until proper uid is found.
read_bytes = read(fd, &entry, sizeof(struct user)); // Keep reading.
}
close(fd); // close the file
if(read_bytes < sizeof(struct user)) // This means that the end of file was reached.
return -1;
else
player = entry; // Copy the read entry into the player struct.
return 1; // Return a success.
}
// This is the new user registration function.
// It will create a new player account and append it to the file
void register_new_player() {
int fd;
printf("-=-={ New Player Registration }=-=-\n");
printf("Enter your name: ");
input_name();
player.uid = getuid();
player.highscore = player.credits = 100;
fd = open(DATAFILE, O_WRONLY|O_CREAT|O_APPEND, S_IRUSR|S_IWUSR);
if(fd == -1)
fatal("in register_new_player() while opening file");
write(fd, &player, sizeof(struct user));
close(fd);
printf("\nWelcome to the Game of Chance %s.\n", player.name);
printf("You have been given %u credits.\n", player.credits);
}
// This function writes the current player data to the file.
// It is used primarily for updating the credits after games.
void update_player_data() {
int fd, i, read_uid;
char burned_byte;
fd = open(DATAFILE, O_RDWR);
if(fd == -1) // If open fails here, something is really wrong.
fatal("in update_player_data() while opening file");
read(fd, &read_uid, 4); // Read the uid from the first struct.
while(read_uid != player.uid) { // Loop until correct uid is found.
for(i=0; i < sizeof(struct user) - 4; i++) // Read through the
read(fd, &burned_byte, 1); // rest of that struct.
read(fd, &read_uid, 4); // Read the uid from the next struct.
}
write(fd, &(player.credits), 4); // Update credits.
write(fd, &(player.highscore), 4); // Update highscore.
write(fd, &(player.name), 100); // Update name.
close(fd);
}
// This function will display the current high score and
// the name of the person who set that high score.
void show_highscore() {
unsigned int top_score = 0;
char top_name[100];
struct user entry;
int fd;
printf("\n====================| HIGH SCORE |====================\n");
fd = open(DATAFILE, O_RDONLY);
if(fd == -1)
fatal("in show_highscore() while opening file");
while(read(fd, &entry, sizeof(struct user)) > 0) { // Loop until end of file.
if(entry.highscore > top_score) { // If there is a higher score,
top_score = entry.highscore; // set top_score to that score
strcpy(top_name, entry.name); // and top_name to that username.
}
}
close(fd);
if(top_score > player.highscore)
printf("%s has the high score of %u\n", top_name, top_score);
else
printf("You currently have the high score of %u credits!\n", player.highscore);
printf("======================================================\n\n");
}
// This function simply awards the jackpot for the Pick a Number game
void jackpot() {
printf("*+*+*+*+*+* JACKPOT *+*+*+*+*+*\n");
printf("You have won the jackpot of 100 credits!\n");
player.credits += 100;
}
// This function is used to input the player name, since
// scanf("%s", &whatever) will stop input at the first space.
void input_name() {
char *name_ptr, input_char='\n';
while(input_char == '\n') // Flush any leftover
scanf("%c", &input_char); // newline chars.
name_ptr = (char *) &(player.name); // name_ptr = player name's address
while(input_char != '\n') { // Loop until newline.
*name_ptr = input_char; // Put the input char into name field.
scanf("%c", &input_char); // Get the next char.
name_ptr++; // Increment the name pointer.
}
*name_ptr = 0; // Terminate the string.
}
// This function prints the 3 cards for the Find the Ace game.
// It expects a message to display, a pointer to the cards array,
// and the card the user has picked as input. If the user_pick is
// -1, then the selection numbers are displayed.
void print_cards(char *message, char *cards, int user_pick) {
int i;
printf("\n\t*** %s ***\n", message);
printf(" \t._.\t._.\t._.\n");
printf("Cards:\t|%c|\t|%c|\t|%c|\n\t", cards[0], cards[1], cards[2]);
if(user_pick == -1)
printf(" 1 \t 2 \t 3\n");
else {
for(i=0; i < user_pick; i++)
printf("\t");
printf(" ^-- your pick\n");
}
}
// This function inputs wagers for both the No Match Dealer and
// Find the Ace games. It expects the available credits and the
// previous wager as arguments. The previous_wager is only important
// for the second wager in the Find the Ace game. The function
// returns -1 if the wager is too big or too little, and it returns
// the wager amount otherwise.
int take_wager(int available_credits, int previous_wager) {
int wager, total_wager;
printf("How many of your %d credits would you like to wager? ", available_credits);
scanf("%d", &wager);
if(wager < 1) { // Make sure the wager is greater than 0.
printf("Nice try, but you must wager a positive number!\n");
return -1;
}
total_wager = previous_wager + wager;
if(total_wager > available_credits) { // Confirm available credits
printf("Your total wager of %d is more than you have!\n", total_wager);
printf("You only have %d available credits, try again.\n", available_credits);
return -1;
}
return wager;
}
// This function contains a loop to allow the current game to be
// played again. It also writes the new credit totals to file
// after each game is played.
void play_the_game() {
int play_again = 1;
int (*game) ();
char selection;
while(play_again) {
printf("\n[DEBUG] current_game pointer @ 0x%08x\n", player.current_game);
if(player.current_game() != -1) { // If the game plays without error and
if(player.credits > player.highscore) // a new high score is set,
player.highscore = player.credits; // update the highscore.
printf("\nYou now have %u credits\n", player.credits);
update_player_data(); // Write the new credit total to file.
printf("Would you like to play again? (y/n) ");
selection = '\n';
while(selection == '\n') // Flush any extra newlines.
scanf("%c", &selection);
if(selection == 'n')
play_again = 0;
}
else // This means the game returned an error,
play_again = 0; // so return to main menu.
}
}
// This function is the Pick a Number game.
// It returns -1 if the player doesn't have enough credits.
int pick_a_number() {
int pick, winning_number;
printf("\n####### Pick a Number ######\n");
printf("This game costs 10 credits to play. Simply pick a number\n");
printf("between 1 and 20, and if you pick the winning number, you\n");
printf("will win the jackpot of 100 credits!\n\n");
winning_number = (rand() % 20) + 1; // Pick a number between 1 and 20.
if(player.credits < 10) {
printf("You only have %d credits. That's not enough to play!\n\n", player.credits);
return -1; // Not enough credits to play
}
player.credits -= 10; // Deduct 10 credits
printf("10 credits have been deducted from your account.\n");
printf("Pick a number between 1 and 20: ");
scanf("%d", &pick);
printf("The winning number is %d\n", winning_number);
if(pick == winning_number)
jackpot();
else
printf("Sorry, you didn't win.\n");
return 0;
}
// This is the No Match Dealer game.
// It returns -1 if the player has 0 credits.
int dealer_no_match() {
int i, j, numbers[16], wager = -1, match = -1;
printf("\n::::::: No Match Dealer :::::::\n");
printf("In this game, you can wager up to all of your credits.\n");
printf("The dealer will deal out 16 random numbers between 0 and 99.\n");
printf("If there are no matches among them, you double your money!\n\n");
if(player.credits == 0) {
printf("You don't have any credits to wager!\n\n");
return -1;
}
while(wager == -1)
wager = take_wager(player.credits, 0);
printf("\t\t::: Dealing out 16 random numbers :::\n");
for(i=0; i < 16; i++) {
numbers[i] = rand() % 100; // pick a number 0 to 99
printf("%2d\t", numbers[i]);
if(i%8 == 7) // Print a line break every 8 numbers.
printf("\n");
}
for(i=0; i < 15; i++) { // Loop looking for matches
j = i + 1;
while(j < 16) {
if(numbers[i] == numbers[j])
match = numbers[i];
j++;
}
}
if(match != -1) {
printf("The dealer matched the number %d!\n", match);
printf("You lose %d credits.\n", wager);
player.credits -= wager;
} else {
printf("There were no matches! You win %d credits!\n", wager);
player.credits += wager;
}
return 0;
}
// This is the Find the Ace game.
// It returns -1 if the player has 0 credits.
int find_the_ace() {
int i, ace, total_wager;
int invalid_choice, pick = -1, wager_one = -1, wager_two = -1;
char choice_two, cards[3] = {'X', 'X', 'X'};
ace = rand()%3; // Place the ace randomly.
printf("******* Find the Ace *******\n");
printf("In this game, you can wager up to all of your credits.\n");
printf("Three cards will be dealt out, two queens and one ace.\n");
printf("If you find the ace, you will win your wager.\n");
printf("After choosing a card, one of the queens will be revealed.\n");
printf("At this point, you may either select a different card or\n");
printf("increase your wager.\n\n");
if(player.credits == 0) {
printf("You don't have any credits to wager!\n\n");
return -1;
}
while(wager_one == -1) // Loop until valid wager is made.
wager_one = take_wager(player.credits, 0);
print_cards("Dealing cards", cards, -1);
pick = -1;
while((pick < 1) || (pick > 3)) { // Loop until valid pick is made.
printf("Select a card: 1, 2, or 3 ");
scanf("%d", &pick);
}
pick--; // Adjust the pick since card numbering starts at 0.
i=0;
while(i == ace || i == pick) // Keep looping until
i++; // we find a valid queen to reveal.
cards[i] = 'Q';
print_cards("Revealing a queen", cards, pick);
invalid_choice = 1;
while(invalid_choice) { // Loop until valid choice is made.
printf("Would you like to:\n[c]hange your pick\tor\t[i]ncrease your wager?\n");
printf("Select c or i: ");
choice_two = '\n';
while(choice_two == '\n') // Flush extra newlines.
scanf("%c", &choice_two);
if(choice_two == 'i') { // Increase wager.
invalid_choice=0; // This is a valid choice.
while(wager_two == -1) // Loop until valid second wager is made.
wager_two = take_wager(player.credits, wager_one);
}
if(choice_two == 'c') { // Change pick.
i = invalid_choice = 0; // Valid choice
while(i == pick || cards[i] == 'Q') // Loop until the other card
i++;// is found,
pick = i;// and then swap pick.
printf("Your card pick has been changed to card %d\n", pick+1);
}
}
for(i=0; i < 3; i++) { // Reveal all of the cards.
if(ace == i)
cards[i] = 'A';
else
cards[i] = 'Q';
}
print_cards("End result", cards, pick);
if(pick == ace) { // handle win
printf("You have won %d credits from your first wager\n", wager_one);
player.credits += wager_one;
if(wager_two != -1) {
printf("and an additional %d credits from your second wager!\n", wager_two);
player.credits += wager_two;
}
} else { // handle loss
printf("You have lost %d credits from your first wager\n", wager_one);
player.credits -= wager_one;
if(wager_two != -1) {
printf("and an additional %d credits from your second wager!\n", wager_two);
player.credits -= wager_two;
}
}
return 0;
}
input to program... AS NEW NAME AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAp? then play once, and quit. Replay, lose, then go to change name...and wallah you get free points!!!!
probably only works in linux... for now...
