Lab6

pa/lab6/lottery.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include "general.h"
+
+#define GUESS_SIZE 64
+#define LOTTERY_LEN 8
+
+void run_lottery(const char* prize) {
+    char guess[LOTTERY_LEN] = {0};
+
+    while (1) {
+        printf("What is your guess: ");
+        read(0, guess, GUESS_SIZE);
+
+        if (!memcmp(prize, guess, LOTTERY_LEN)) {
+            printf("Congratulations! You won the lottery: %s\n", getflag());
+        } else {
+            puts("Wrong guess. Do you want to play again?");
+        }
+    }
+}
+
+int main() {
+    init();
+    char lottery[LOTTERY_LEN];
+
+    int fd = open("/dev/urandom", O_RDONLY);
+    read(fd, lottery, LOTTERY_LEN);
+    close(fd);
+
+    run_lottery(lottery);
+}