create game of chance.

1 files changed, 412 insertions, 0 deletions

diff --git a/game_of_chance.c b/game_of_chance.c
new file mode 100644
index 0000000..b9ddc35
--- /dev/null
+++ b/game_of_chance.c
@@ -0,0 +1,412 @@
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <time.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "hacking.h"
+
+#define DATAFILE "/var/chance.data"
+
+struct user {
+  int uid;
+  int credits;
+  int highscore;
+  char name[100];
+  int (*current_game) ();
+};
+
+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 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 *);
+
+struct user player;
+
+int main(int argc, const char *argv[])
+{
+  int choice, last_game;
+  srand(time(0));
+
+  if(get_player_data() == -1)
+    register_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) {
+      if (choice != last_game) {
+        if (choice == 1) {
+          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;
+      }
+      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");
+  return 0;
+}
+
+int get_player_data()
+{
+  int fd, uid, read_bytes;
+  struct user entry;
+
+  uid = getuid();
+  fd = open(DATAFILE, O_RDONLY);
+  if (fd == -1)
+    return -1;
+  read_bytes = read(fd, &entry, sizeof(struct user));
+  while(entry.uid != uid && read_bytes > 0) {
+    read_bytes = read(fd, &entry, sizeof(struct user));
+  }
+  close(fd);
+  if (read_bytes < sizeof(struct user)) {
+    return -1;
+  }
+  else
+    player = entry;
+  return 1;
+}
+
+void register_new_player()
+{
+  int fd;
+  printf("-=-={ New Player Registration }=-=-\n");
+  printf("Enter your name: \n");
+  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);
+}
+
+void update_player_data()
+{
+  int fd, i, read_uid;
+  char burned_byte;
+
+  fd = open(DATAFILE, O_RDWR);
+  if (fd == -1)
+    fatal("in update_player_data() while opening file");
+  read(fd, &read_uid, 4);
+  while(read_uid != player.uid) {
+    for (i = 0; i < sizeof(struct user) - 4; i++) {
+      read(fd, &burned_byte, 1);
+    }
+    read(fd, &read_uid, 4);
+  }
+  write(fd, &(player.credits), 4);
+  write(fd, &(player.highscore), 4);
+  write(fd, &(player.name), 4);
+  close(fd);
+}
+
+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) {
+    if (entry.highscore > top_score) {
+      top_score = entry.highscore;
+      strcpy(top_name, entry.name);
+    }
+  }
+  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");
+}
+
+void jackpot()
+{
+  printf("*+*+*+*+* JACKPOT *+*+*+*+*\n");
+  printf("You have won the jackpot of 100 credits!\n");
+  player.credits += 100;
+}
+
+void input_name()
+{
+  char *name_ptr, input_char='\n';
+  while(input_char == '\n')
+    scanf("%c", &input_char);
+
+  name_ptr = (char *) &(player.name);
+  while(input_char != '\n') {
+    *name_ptr = input_char;
+    scanf("%c", &input_char);
+    name_ptr++;
+  }
+  *name_ptr = 0;
+}
+
+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");
+  }
+}
+
+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) {
+    printf("Nice try, but you must wager a positive number!\n");
+    return -1;
+  }
+  total_wager = previous_wager + wager;
+  if (total_wager > 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;
+}
+
+void play_the_game()
+{
+  int play_again = 1;
+  int (*game) ();
+  char selection;
+
+  while(play_again) {
+    printf("\n[DEBUG] current_game pointer @ %p\n", player.current_game);
+    if (player.current_game() != -1 ) {
+      if (player.credits > player.highscore)
+        player.highscore = player.credits;
+      printf("\nYou now have %u credits\n", player.credits);
+      update_player_data();
+      printf("Would you like to play again? (y/n)  ");
+      selection = '\n';
+      while (selection = '\n')
+        scanf("%c", &selection);
+      if(selection == 'n')
+        play_again = 0;
+    }
+    else
+      play_again = 0;
+  }
+}
+
+int pick_a_number()
+{
+  int pick, winning_number;
+
+  printf("\n####### Pick a Number ######\n");
+  printf("This game costs 10 credits to play. Simple 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;
+  if(player.credits < 10) {
+    printf("You only have %d credits. That's not enough to play!\n\n", player.credits);
+    return -1;
+  }
+  player.credits -= 10;
+  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;
+}
+
+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;
+    printf("%2d\t", numbers[i]);
+    if(i % 8 == 7)
+      printf("\n");
+  }
+  for (i = 0; i < 15; i++) {
+    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;
+}
+
+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;
+  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 queen 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)
+    wager_one = take_wager(player.credits, 0);
+
+  print_cards("Dealing cards", cards, -1);
+  pick = -1;
+  while((pick < 1) || (pick > 3)) {
+    printf("Select a card: 1, 2, or 3  ");
+    scanf("%d", &pick);
+  }
+  pick--;
+  i=0;
+  while(i == ace || i == pick)
+    i++;
+  cards[i] = 'Q';
+  print_cards("Revealing a queen", cards, pick);
+  invalid_choice = 1;
+  while(invalid_choice) {
+    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')
+      scanf("%c", &choice_two);
+    if (choice_two == 'i') {
+      invalid_choice=0;
+      while(wager_two == -1)
+        wager_two = take_wager(player.credits, wager_one);
+    }
+    if(choice_two == 'c') {
+      i = invalid_choice = 0;
+      while(i == pick || cards[i] == 'Q')
+        i++;
+      pick = i;
+      printf("Your card pick has been changed to card %d\n", pick+1);
+    }
+  }
+  for (i = 0; i < 3; i++) {
+    if(ace == i)
+      cards[i] = 'A';
+    else
+      cards[i] = 'Q';
+  }
+  print_cards("End result", cards, pick);
+
+  if(pick == ace) {
+    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 {
+    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;
+}