checks return value for scanf, aprintf, ...

Author: Judro

src/controls.c

@@ -53,7 +53,11 @@ int cmove(GameInstance g, WINDOW **window) {
     break;
   case 'm':
     endwin();
-    system("man mines-tui");
+    if (system("man mines-tui") != 0) {
+      printf("Please press enter to continue.\n");
+      while (getchar() == 0)
+        ;
+    }
     *window = create_window();
     break;
   }

src/display.c

@@ -57,7 +57,7 @@ void print_scrollable(char **text, unsigned terminal_width,
   while (*tmp != NULL && index < highscore_window_height) {
     print_left_margin(terminal_width, text_width);
     printw("│");
-    printw(*tmp);
+    printw("%s", *tmp);
     for (int i = 0; i < text_width - strlen(*tmp); i++)
       printw(" ");
     printw("│\n");

src/highscore.c

@@ -16,7 +16,8 @@ FILE *init_state_files() {
   char *username = getenv("USER");
   if (strcmp(username, "root") == 0) {
     printf("Please enter your username ($USER): ");
-    scanf("%s[^\n]", username_n);
+    while (scanf("%s[^\n]", username_n) != 1)
+      ;
     username = username_n;
   }
   char save_path[strlen(save_directory) + strlen(username) + 5];
@@ -150,9 +151,12 @@ char **userHighscores2string(UserHighscore *highscores) {
     char time[32];
     struct tm *local_time = localtime(&highscores[index].highscore.date);
     strftime(time, 32, "%Y-%m-%d", local_time);
-    asprintf(&tmp, " %02u:%02u  %s  %s ", highscores[index].highscore.time / 60,
-             highscores[index].highscore.time % 60, time,
-             highscores[index].user);
+    if (asprintf(&tmp, " %02u:%02u  %s  %s ",
+                 highscores[index].highscore.time / 60,
+                 highscores[index].highscore.time % 60, time,
+                 highscores[index].user) == -1)
+      exit(EXIT_FAILURE);
+
     if (tmp == NULL)
       exit(EXIT_FAILURE);
     free(highscores[index].user);

src/menu.c

@@ -104,7 +104,11 @@ GameInstance select_mode(WINDOW **window) {
         return get_custom_game(window);
       case 4:
         endwin();
-        system("man mines-tui");
+        if (system("man mines-tui") != 0) {
+          printf("Please press enter to continue.\n");
+          while (getchar() == 0)
+            ;
+        }
         *window = create_window();
         return select_mode(window);
       default: