snake_c

public

Small snake game in C

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#include <termios.h>
#include <unistd.h>

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

#include <sys/ioctl.h>

#include <sys/time.h>
#include <time.h>

#include <ctype.h>
#include <string.h>

#define RIGHT_CODE 'C'
#define LEFT_CODE 'D'
#define UP_CODE 'A'
#define DOWN_CODE 'B'

#define WIDTH 20
#define HEIGHT 20

#define STRING_LEN 20

#define ACTUAL_WIDTH ((WIDTH * 2) + 2)
#define ACTUAL_HEIGHT (HEIGHT + 2)

#define SPEED 100 /* in ms */

#define MAX_LENGTH 1000
#define STARTING_LENGTH 2

typedef enum { NEW_GAME, SETTINGS, EXIT, MAIN_MENU } main_menu;

typedef enum {
  NO_DIRECTION = -1,
  UP = 0,
  LEFT = 1,
  DOWN = 2,
  RIGHT = 3,
  DIRECTIONS = 4
} direction;

typedef struct selected {
  int16_t x;
  int16_t y;
} selected;

typedef struct snake {
  selected position[MAX_LENGTH];
  uint16_t length;
} snake;

void update_field(snake my_snake, char board[HEIGHT][WIDTH][STRING_LEN],
                  selected fruit);
selected new_fruit(char board[HEIGHT][WIDTH][STRING_LEN]);

bool draw_menu(main_menu menu, struct winsize window_size);

void draw_board(char board[HEIGHT][WIDTH][STRING_LEN],
                struct winsize window_size, bool redraw);
void draw_pause(struct winsize window_size);

direction read_direction(char *string, bool wasd_enabled);

int main(int argc, char *args[]) {

  /* command argument handling */

  if (argc > 1) {
    if (argc > 2) {
      printf("Too many parameters\n");
      goto help_info;
    }

    if (!strcmp(args[1], "-h") || !strcmp(args[1], "--help")) {

      printf("This is a small TUI snake game.\n\n");
      printf("Controls: Arrow keys/WASD to control the snake.\n");
      printf("          P to pause.\n");
      printf("          Q to quit.\n");

      return 0;
    }

    printf("Argument \"%s\" not recognized\n", args[1]);

  help_info:
    printf("Try \"-h\" or \"--help\" for more information\n");
    return 1;
  }

  /* Setting up terminal with termios */

  struct termios old, new;

  tcgetattr(STDIN_FILENO, &old);

  new = old;

  new.c_lflag &= ~(ECHO | ICANON);
  new.c_cc[VMIN] = 0;
  new.c_cc[VTIME] = 1;

  tcsetattr(STDIN_FILENO, TCSANOW, &new);

  srand(time(NULL));

  printf("\033[?25l");

  struct winsize init_size, current_size;
  ioctl(STDOUT_FILENO, TIOCGWINSZ, &init_size);
  current_size = init_size;
  bool too_small = false;

  struct timeval start;
  gettimeofday(&start, NULL);

  /* Menu */

  bool menu = true;

  main_menu selected_menu = NEW_GAME;

  too_small = draw_menu(selected_menu, init_size);

  while (menu) {

    bool pressed_enter = false;
    bool changed_selected = false;

    char string[1000] = {};
    ssize_t length_string = read(STDIN_FILENO, string, sizeof(string) - 1);

    direction arrow = NO_DIRECTION;

    /* Check for window size */

    struct timeval current;
    gettimeofday(&current, NULL);

    uint64_t time_diff = (current.tv_sec - start.tv_sec) * 1000000 +
                         (current.tv_usec - start.tv_usec);

    if (time_diff >= SPEED * 1000) {

      ioctl(STDOUT_FILENO, TIOCGWINSZ, &current_size);

      if (current_size.ws_col != init_size.ws_col ||
          current_size.ws_row != init_size.ws_row) {
        init_size = current_size;
        changed_selected = true;
      }
    }

    if (length_string > 0 && !too_small) {
      string[length_string] = '\0';

      arrow = read_direction(string, false);

      switch (arrow) {
      case UP:
        selected_menu = (selected_menu + (MAIN_MENU - 1)) % MAIN_MENU;
        changed_selected = true;
        break;
      case DOWN:
        selected_menu = (selected_menu + 1) % MAIN_MENU;
        changed_selected = true;
        break;
      default:
        break;
      }

      if (toupper(string[0]) == 'Q')
        goto end_of_program;

      if (string[0] == '\n')
        pressed_enter = true;
    }

    if (changed_selected)
      too_small = draw_menu(selected_menu, init_size);

    if (pressed_enter) {
      switch (selected_menu) {
      case NEW_GAME:
        menu = false;
        break;
      default:
        goto end_of_program;
        break;
      }
    }
  }

  /* initialisation of the game */

  snake my_snake = {};
  my_snake.length = STARTING_LENGTH;

  {
    uint16_t i;

    my_snake.position[0].y = HEIGHT >> 1;
    my_snake.position[0].x = WIDTH >> 1;
    for (i = 1; i < my_snake.length; i++) {
      my_snake.position[i].y = -1;
      my_snake.position[i].x = -1;
    }
  }

  selected fruit = {-1, -1};
  char board[HEIGHT][WIDTH][STRING_LEN] = {};

  update_field(my_snake, board, fruit);

  fruit = new_fruit(board);
  update_field(my_snake, board, fruit);

  bool paused = false;

  if (current_size.ws_row < ACTUAL_HEIGHT ||
      current_size.ws_col < ACTUAL_WIDTH) {
    too_small = true;
    paused = true;

    printf("\033[2J\033[HToo small\n");
    printf("Min width: %i & Min height: %i\n", ACTUAL_WIDTH, ACTUAL_WIDTH);
  } else {
    draw_board(board, current_size, true);
  }

  direction shift = RIGHT;
  direction tmp_direction = shift;

  bool run = true;

  /* start of the actual game loop */

  while (run) {

    /* input handling  */

    if (!too_small) {
      char string[1000] = {};
      ssize_t length_string = read(STDIN_FILENO, string, sizeof(string) - 1);

      if (length_string > 0) {
        string[length_string] = '\0';

        if (!paused)
          tmp_direction = read_direction(string, true);

        if (toupper(string[0]) == 'Q')
          run = false;

        if (toupper(string[0]) == 'P') {
          paused = !paused;
          if (paused)
            draw_pause(current_size);
        }
      }
    }

    /* game logic */

    struct timeval current;
    gettimeofday(&current, NULL);

    uint64_t time_diff = (current.tv_sec - start.tv_sec) * 1000000 +
                         (current.tv_usec - start.tv_usec);

    if (time_diff >= SPEED * 1000) {

      ioctl(STDOUT_FILENO, TIOCGWINSZ, &current_size);

      if (current_size.ws_col != init_size.ws_col ||
          current_size.ws_row != init_size.ws_row) {
        init_size = current_size;

        paused = true;

        if (current_size.ws_row < ACTUAL_HEIGHT ||
            current_size.ws_col < ACTUAL_WIDTH) {
          too_small = true;

          printf("\033[2J\033[HToo small\n");
          printf("Min width: %i & Min height: %i\n", ACTUAL_WIDTH,
                 ACTUAL_WIDTH);
        } else {
          too_small = false;

          draw_board(board, current_size, true);
          draw_pause(current_size);
        }
      }

      if (!paused) {

        start = current;
        if (tmp_direction != NO_DIRECTION &&
            ((shift + (DIRECTIONS >> 1)) % DIRECTIONS) != tmp_direction) {
          shift = tmp_direction;
        }

        uint16_t i;
        for (i = my_snake.length; i > 0; i--) {
          my_snake.position[i].y = my_snake.position[i - 1].y;
          my_snake.position[i].x = my_snake.position[i - 1].x;
        }

        switch (shift) {
        case UP:
          my_snake.position[0].y =
              ((my_snake.position[0].y + HEIGHT - 1) % HEIGHT);
          break;
        case DOWN:
          my_snake.position[0].y = ((my_snake.position[0].y + 1) % HEIGHT);
          break;
        case LEFT:
          my_snake.position[0].x =
              ((my_snake.position[0].x + WIDTH - 1) % WIDTH);
          break;
        case RIGHT:
          my_snake.position[0].x = ((my_snake.position[0].x + 1) % WIDTH);
          break;
        default:
          goto end_of_program;
          break;
        }

        uint8_t head_y = my_snake.position[0].y;
        uint8_t head_x = my_snake.position[0].x;

        for (i = 1; i < my_snake.length; i++) {
          int16_t x = my_snake.position[i].x;
          int16_t y = my_snake.position[i].y;

          if (x == head_x && y == head_y) {
            printf("\n\nHAHA LOST!!!\n\n");
            goto end_of_program;
          }
        }

        update_field(my_snake, board, fruit);

        if (head_y == fruit.y && head_x == fruit.x) {
          my_snake.length++;
          fruit = new_fruit(board);
        }

        update_field(my_snake, board, fruit);
        draw_board(board, current_size, false);
      }
    }
  }

end_of_program:

  tcsetattr(STDIN_FILENO, TCSANOW, &old);
  printf("\033[?25h\n\n");

  return 0;
}

void update_field(snake my_snake, char board[HEIGHT][WIDTH][STRING_LEN],
                  selected fruit) {

  uint8_t i, j;

  for (i = 0; i < HEIGHT; i++) {
    for (j = 0; j < WIDTH; j++) {
      strcpy(board[i][j], "  ");
    }
  }

  for (i = 0; i < my_snake.length; i++) {
    int16_t x = my_snake.position[i].x;
    int16_t y = my_snake.position[i].y;
    if (x >= 0 && y >= 0) {
      if (!i) {
        if (x == (my_snake.position[i + 1].x + 1) % WIDTH) {
          strcpy(board[y][x], "\033[33m═\033[31mX\033[0m");
        } else {
          strcpy(board[y][x], "\033[31m X\033[0m");
        }
      } else if (i == my_snake.length - 1) {
        if (x != my_snake.position[i - 1].x) {
          strcpy(board[y][x], "\033[33m══\033[0m");
        } else {
          strcpy(board[y][x], "\033[33m ║\033[0m");
        }
      } else {
        if (x != my_snake.position[i - 1].x &&
            x != my_snake.position[i + 1].x) {
          strcpy(board[y][x], "\033[33m══\033[0m");
        } else if (y != my_snake.position[i - 1].y &&
                   y != my_snake.position[i + 1].y) {
          strcpy(board[y][x], "\033[33m ║\033[0m");
        } else if ((y == (my_snake.position[i - 1].y + 1) % HEIGHT &&
                    x == (my_snake.position[i + 1].x + 1) % WIDTH) ||
                   (y == (my_snake.position[i + 1].y + 1) % HEIGHT &&
                    x == (my_snake.position[i - 1].x + 1) % WIDTH)) {
          strcpy(board[y][x], "\033[33m═╝\033[0m");
        } else if ((y == (my_snake.position[i - 1].y + (HEIGHT - 1)) % HEIGHT &&
                    x == (my_snake.position[i + 1].x + 1) % WIDTH) ||
                   (y == (my_snake.position[i + 1].y + HEIGHT - 1) % HEIGHT &&
                    x == (my_snake.position[i - 1].x + 1) % WIDTH)) {
          strcpy(board[y][x], "\033[33m═╗\033[0m");
        } else if ((y == (my_snake.position[i - 1].y + 1) % HEIGHT &&
                    x == (my_snake.position[i + 1].x + (WIDTH - 1)) % WIDTH) ||
                   (y == (my_snake.position[i + 1].y + 1) % HEIGHT &&
                    x == (my_snake.position[i - 1].x + (WIDTH - 1)) % WIDTH)) {
          strcpy(board[y][x], "\033[33m ╚\033[0m");
        } else if ((y == (my_snake.position[i - 1].y + (HEIGHT - 1)) % HEIGHT &&
                    x == (my_snake.position[i + 1].x + (WIDTH - 1)) % WIDTH) ||
                   (y == (my_snake.position[i + 1].y + (HEIGHT - 1)) % HEIGHT &&
                    x == (my_snake.position[i - 1].x + (WIDTH - 1)) % WIDTH)) {
          strcpy(board[y][x], "\033[33m ╔\033[0m");
        }
      }
    }
  }

  if (fruit.x >= 0 && fruit.y >= 0)
    strcpy(board[fruit.y][fruit.x], "\033[32m O\033[0m");
}

selected new_fruit(char board[HEIGHT][WIDTH][STRING_LEN]) {
  bool found_space = false;

  uint8_t x;
  uint8_t y;

  while (!found_space) {
    x = rand() % WIDTH;
    y = rand() % HEIGHT;

    if (!strcmp(board[y][x], "  "))
      found_space = true;
  }

  selected fruit = {x, y};

  return fruit;
}

bool draw_menu(main_menu menu, struct winsize window_size) {

  char *menu_string[] = {"NEW GAME", "SETTINGS", "EXIT"};

  const uint8_t width_small = 8;
  const uint8_t height_small = 5;

  char *menu_string_big[][6] = {
      {"███╗   ██╗███████╗██╗    ██╗     ██████╗  █████╗ ███╗   ███╗███████╗",
       "████╗  ██║██╔════╝██║    ██║    ██╔════╝ ██╔══██╗████╗ ████║██╔════╝",
       "██╔██╗ ██║█████╗  ██║ █╗ ██║    ██║  ███╗███████║██╔████╔██║█████╗  ",
       "██║╚██╗██║██╔══╝  ██║███╗██║    ██║   ██║██╔══██║██║╚██╔╝██║██╔══╝  ",
       "██║ ╚████║███████╗╚███╔███╔╝    ╚██████╔╝██║  ██║██║ ╚═╝ ██║███████╗",
       "╚═╝  ╚═══╝╚══════╝ ╚══╝╚══╝      ╚═════╝ ╚═╝  ╚═╝╚═╝     ╚═╝╚══════╝"},
      {"███████╗███████╗████████╗████████╗██╗███╗   ██╗ ██████╗ ███████╗",
       "██╔════╝██╔════╝╚══██╔══╝╚══██╔══╝██║████╗  ██║██╔════╝ ██╔════╝",
       "███████╗█████╗     ██║      ██║   ██║██╔██╗ ██║██║  ███╗███████╗",
       "╚════██║██╔══╝     ██║      ██║   ██║██║╚██╗██║██║   ██║╚════██║",
       "███████║███████╗   ██║      ██║   ██║██║ ╚████║╚██████╔╝███████║",
       "╚══════╝╚══════╝   ╚═╝      ╚═╝   ╚═╝╚═╝  ╚═══╝ ╚═════╝ ╚══════╝"},
      {"███████╗██╗  ██╗██╗████████╗", "██╔════╝╚██╗██╔╝██║╚══██╔══╝",
       "█████╗   ╚███╔╝ ██║   ██║   ", "██╔══╝   ██╔██╗ ██║   ██║   ",
       "███████╗██╔╝ ██╗██║   ██║   ", "╚══════╝╚═╝  ╚═╝╚═╝   ╚═╝   "}};

  const uint8_t height_line = 6;
  const uint8_t height_space = 2;

  const uint8_t width_text[] = {68, 64, 28};

  const uint8_t width_big = width_text[0] /*strlen(menu_string_big[0][0])*/;
  const uint8_t height_big =
      height_line * MAIN_MENU + height_space * (MAIN_MENU - 1);

  printf("\033[2J\033[H");

  if (window_size.ws_row < height_small || window_size.ws_col < width_small) {
    printf("Too small\n");
    return true;
  }

  uint8_t i, j, k;

  if (window_size.ws_row >= height_big && window_size.ws_col >= width_big) {

    uint8_t vertical_buffer = (window_size.ws_row - height_big) >> 1;

    for (i = 0; i < vertical_buffer; i++)
      printf("\n");

    for (i = 0; i < MAIN_MENU; i++) {

      if (i == menu)
        printf("\033[32m");

      uint8_t horizontal_buffer = (window_size.ws_col - width_text[i]) >> 1;

      for (j = 0; j < height_line; j++) {

        for (k = 0; k < horizontal_buffer; k++)
          printf(" ");

        printf("%s", menu_string_big[i][j]);

        if (j != height_line - 1)
          printf("\n");
      }

      printf("\033[0m");

      if (i != MAIN_MENU - 1)
        printf("\n\n");
    }

  } else {

    uint8_t vertical_buffer = (window_size.ws_row - height_small) >> 1;

    for (i = 0; i < vertical_buffer; i++)
      printf("\n");

    for (i = 0; i < MAIN_MENU; i++) {
      if (i == menu)
        printf("\033[32m");

      uint8_t horizontal_buffer =
          (window_size.ws_col - strlen(menu_string[i])) >> 1;

      for (j = 0; j < horizontal_buffer; j++)
        printf(" ");

      printf("%s\033[0m", menu_string[i]);

      if (i != MAIN_MENU - 1)
        printf("\n\n");
    }
  }

  fflush(stdout);
  return false;
}

void draw_board(char board[HEIGHT][WIDTH][STRING_LEN],
                struct winsize window_size, bool redraw) {

  uint8_t i, j;

  uint8_t actual_height = HEIGHT + 2;
  uint8_t actual_width = WIDTH * 2 + 2;

  uint8_t vertical_buffer = (window_size.ws_row - actual_height) >> 1;
  uint8_t horizontal_buffer = (window_size.ws_col - actual_width) >> 1;

  if (redraw) {
    printf("\033[2J\033[H");
    for (i = 0; i < vertical_buffer; i++)
      printf("\n");
  } else {
    for (i = 0; i < actual_height - 1; i++)
      printf("\033[%c", UP_CODE);
    printf("\r");
  }

  for (i = 0; i < horizontal_buffer; i++)
    printf(" ");
  printf("+");
  for (i = 0; i < WIDTH; i++)
    printf("--");
  printf("+\n");

  for (i = 0; i < HEIGHT; i++) {

    for (j = 0; j < horizontal_buffer; j++)
      printf(" ");

    printf("|");

    for (j = 0; j < WIDTH; j++)
      printf("%s", board[i][j]);

    printf("|\n");
  }

  for (i = 0; i < horizontal_buffer; i++)
    printf(" ");
  printf("+");
  for (i = 0; i < WIDTH; i++)
    printf("--");
  printf("+");
  fflush(stdout);
}

void draw_pause(struct winsize window_size) {

  const uint8_t height = 5;
  const uint8_t width = 14;

  const char *pause_menu[] = {"+------------+", "|            |",
                              "|   PAUSED   |", "|            |",
                              "+------------+"};

  const uint8_t going_up = (ACTUAL_HEIGHT + height) >> 1;
  const uint8_t going_right = (ACTUAL_WIDTH - width) >> 1;

  const uint8_t horizontal_buffer = (window_size.ws_col - ACTUAL_WIDTH) >> 1;

  uint8_t i, j;

  for (i = 0; i < going_up; i++)
    printf("\033[%c", UP_CODE);
  printf("\r");

  for (i = 0; i < height; i++) {
    for (j = 0; j < horizontal_buffer; j++)
      printf("\033[%c", RIGHT_CODE);
    for (j = 0; j < going_right; j++)
      printf("\033[%c", RIGHT_CODE);

    printf("\033[37m%s\033[0m\033[%c\r", pause_menu[i], DOWN_CODE);
  }

  for (i = 0; i < going_up - height; i++)
    printf("\033[%c", DOWN_CODE);
  printf("\r");

  fflush(stdout);
}

direction read_direction(char *string, bool wasd_enabled) {

  if (strlen(string) >= 3) {
    if (string[0] == '\033') {
      if (string[1] == '[') {

        switch (string[2]) {
        case RIGHT_CODE:
          return RIGHT;
          break;
        case LEFT_CODE:
          return LEFT;
          break;
        case UP_CODE:
          return UP;
          break;
        case DOWN_CODE:
          return DOWN;
          break;
        }
      }
    }
  }

  if (wasd_enabled) {
    switch (toupper(string[0])) {
    case 'A':
      return LEFT;
      break;
    case 'D':
      return RIGHT;
      break;
    case 'W':
      return UP;
      break;
    case 'S':
      return DOWN;
      break;
    }
  }

  return NO_DIRECTION;
}

1	#include <termios.h>
2	#include <unistd.h>
3
4	#include <stdbool.h>
5	#include <stdint.h>
6	#include <stdio.h>
7	#include <stdlib.h>
8
9	#include <sys/ioctl.h>
10
11	#include <sys/time.h>
12	#include <time.h>
13
14	#include <ctype.h>
15	#include <string.h>
16
17	#define RIGHT_CODE 'C'
18	#define LEFT_CODE 'D'
19	#define UP_CODE 'A'
20	#define DOWN_CODE 'B'
21
22	#define WIDTH 20
23	#define HEIGHT 20
24
25	#define STRING_LEN 20
26
27	#define ACTUAL_WIDTH ((WIDTH * 2) + 2)
28	#define ACTUAL_HEIGHT (HEIGHT + 2)
29
30	#define SPEED 100 /* in ms */
31
32	#define MAX_LENGTH 1000
33	#define STARTING_LENGTH 2
34
35	typedef enum { NEW_GAME, SETTINGS, EXIT, MAIN_MENU } main_menu;
36
37	typedef enum {
38	NO_DIRECTION = -1,
39	UP = 0,
40	LEFT = 1,
41	DOWN = 2,
42	RIGHT = 3,
43	DIRECTIONS = 4
44	} direction;
45
46	typedef struct selected {
47	int16_t x;
48	int16_t y;
49	} selected;
50
51	typedef struct snake {
52	selected position[MAX_LENGTH];
53	uint16_t length;
54	} snake;
55
56	void update_field(snake my_snake, char board[HEIGHT][WIDTH][STRING_LEN],
57	selected fruit);
58	selected new_fruit(char board[HEIGHT][WIDTH][STRING_LEN]);
59
60	bool draw_menu(main_menu menu, struct winsize window_size);
61
62	void draw_board(char board[HEIGHT][WIDTH][STRING_LEN],
63	struct winsize window_size, bool redraw);
64	void draw_pause(struct winsize window_size);
65
66	direction read_direction(char *string, bool wasd_enabled);
67
68	int main(int argc, char *args[]) {
69
70	/* command argument handling */
71
72	if (argc > 1) {
73	if (argc > 2) {
74	printf("Too many parameters\n");
75	goto help_info;
76	}
77
78	if (!strcmp(args[1], "-h") \|\| !strcmp(args[1], "--help")) {
79
80	printf("This is a small TUI snake game.\n\n");
81	printf("Controls: Arrow keys/WASD to control the snake.\n");
82	printf(" P to pause.\n");
83	printf(" Q to quit.\n");
84
85	return 0;
86	}
87
88	printf("Argument \"%s\" not recognized\n", args[1]);
89
90	help_info:
91	printf("Try \"-h\" or \"--help\" for more information\n");
92	return 1;
93	}
94
95	/* Setting up terminal with termios */
96
97	struct termios old, new;
98
99	tcgetattr(STDIN_FILENO, &old);
100
101	new = old;
102
103	new.c_lflag &= ~(ECHO \| ICANON);
104	new.c_cc[VMIN] = 0;
105	new.c_cc[VTIME] = 1;
106
107	tcsetattr(STDIN_FILENO, TCSANOW, &new);
108
109	srand(time(NULL));
110
111	printf("\033[?25l");
112
113	struct winsize init_size, current_size;
114	ioctl(STDOUT_FILENO, TIOCGWINSZ, &init_size);
115	current_size = init_size;
116	bool too_small = false;
117
118	struct timeval start;
119	gettimeofday(&start, NULL);
120
121	/* Menu */
122
123	bool menu = true;
124
125	main_menu selected_menu = NEW_GAME;
126
127	too_small = draw_menu(selected_menu, init_size);
128
129	while (menu) {
130
131	bool pressed_enter = false;
132	bool changed_selected = false;
133
134	char string[1000] = {};
135	ssize_t length_string = read(STDIN_FILENO, string, sizeof(string) - 1);
136
137	direction arrow = NO_DIRECTION;
138
139	/* Check for window size */
140
141	struct timeval current;
142	gettimeofday(&current, NULL);
143
144	uint64_t time_diff = (current.tv_sec - start.tv_sec) * 1000000 +
145	(current.tv_usec - start.tv_usec);
146
147	if (time_diff >= SPEED * 1000) {
148
149	ioctl(STDOUT_FILENO, TIOCGWINSZ, &current_size);
150
151	if (current_size.ws_col != init_size.ws_col \|\|
152	current_size.ws_row != init_size.ws_row) {
153	init_size = current_size;
154	changed_selected = true;
155	}
156	}
157
158	if (length_string > 0 && !too_small) {
159	string[length_string] = '\0';
160
161	arrow = read_direction(string, false);
162
163	switch (arrow) {
164	case UP:
165	selected_menu = (selected_menu + (MAIN_MENU - 1)) % MAIN_MENU;
166	changed_selected = true;
167	break;
168	case DOWN:
169	selected_menu = (selected_menu + 1) % MAIN_MENU;
170	changed_selected = true;
171	break;
172	default:
173	break;
174	}
175
176	if (toupper(string[0]) == 'Q')
177	goto end_of_program;
178
179	if (string[0] == '\n')
180	pressed_enter = true;
181	}
182
183	if (changed_selected)
184	too_small = draw_menu(selected_menu, init_size);
185
186	if (pressed_enter) {
187	switch (selected_menu) {
188	case NEW_GAME:
189	menu = false;
190	break;
191	default:
192	goto end_of_program;
193	break;
194	}
195	}
196	}
197
198	/* initialisation of the game */
199
200	snake my_snake = {};
201	my_snake.length = STARTING_LENGTH;
202
203	{
204	uint16_t i;
205
206	my_snake.position[0].y = HEIGHT >> 1;
207	my_snake.position[0].x = WIDTH >> 1;
208	for (i = 1; i < my_snake.length; i++) {
209	my_snake.position[i].y = -1;
210	my_snake.position[i].x = -1;
211	}
212	}
213
214	selected fruit = {-1, -1};
215	char board[HEIGHT][WIDTH][STRING_LEN] = {};
216
217	update_field(my_snake, board, fruit);
218
219	fruit = new_fruit(board);
220	update_field(my_snake, board, fruit);
221
222	bool paused = false;
223
224	if (current_size.ws_row < ACTUAL_HEIGHT \|\|
225	current_size.ws_col < ACTUAL_WIDTH) {
226	too_small = true;
227	paused = true;
228
229	printf("\033[2J\033[HToo small\n");
230	printf("Min width: %i & Min height: %i\n", ACTUAL_WIDTH, ACTUAL_WIDTH);
231	} else {
232	draw_board(board, current_size, true);
233	}
234
235	direction shift = RIGHT;
236	direction tmp_direction = shift;
237
238	bool run = true;
239
240	/* start of the actual game loop */
241
242	while (run) {
243
244	/* input handling */
245
246	if (!too_small) {
247	char string[1000] = {};
248	ssize_t length_string = read(STDIN_FILENO, string, sizeof(string) - 1);
249
250	if (length_string > 0) {
251	string[length_string] = '\0';
252
253	if (!paused)
254	tmp_direction = read_direction(string, true);
255
256	if (toupper(string[0]) == 'Q')
257	run = false;
258
259	if (toupper(string[0]) == 'P') {
260	paused = !paused;
261	if (paused)
262	draw_pause(current_size);
263	}
264	}
265	}
266
267	/* game logic */
268
269	struct timeval current;
270	gettimeofday(&current, NULL);
271
272	uint64_t time_diff = (current.tv_sec - start.tv_sec) * 1000000 +
273	(current.tv_usec - start.tv_usec);
274
275	if (time_diff >= SPEED * 1000) {
276
277	ioctl(STDOUT_FILENO, TIOCGWINSZ, &current_size);
278
279	if (current_size.ws_col != init_size.ws_col \|\|
280	current_size.ws_row != init_size.ws_row) {
281	init_size = current_size;
282
283	paused = true;
284
285	if (current_size.ws_row < ACTUAL_HEIGHT \|\|
286	current_size.ws_col < ACTUAL_WIDTH) {
287	too_small = true;
288
289	printf("\033[2J\033[HToo small\n");
290	printf("Min width: %i & Min height: %i\n", ACTUAL_WIDTH,
291	ACTUAL_WIDTH);
292	} else {
293	too_small = false;
294
295	draw_board(board, current_size, true);
296	draw_pause(current_size);
297	}
298	}
299
300	if (!paused) {
301
302	start = current;
303	if (tmp_direction != NO_DIRECTION &&
304	((shift + (DIRECTIONS >> 1)) % DIRECTIONS) != tmp_direction) {
305	shift = tmp_direction;
306	}
307
308	uint16_t i;
309	for (i = my_snake.length; i > 0; i--) {
310	my_snake.position[i].y = my_snake.position[i - 1].y;
311	my_snake.position[i].x = my_snake.position[i - 1].x;
312	}
313
314	switch (shift) {
315	case UP:
316	my_snake.position[0].y =
317	((my_snake.position[0].y + HEIGHT - 1) % HEIGHT);
318	break;
319	case DOWN:
320	my_snake.position[0].y = ((my_snake.position[0].y + 1) % HEIGHT);
321	break;
322	case LEFT:
323	my_snake.position[0].x =
324	((my_snake.position[0].x + WIDTH - 1) % WIDTH);
325	break;
326	case RIGHT:
327	my_snake.position[0].x = ((my_snake.position[0].x + 1) % WIDTH);
328	break;
329	default:
330	goto end_of_program;
331	break;
332	}
333
334	uint8_t head_y = my_snake.position[0].y;
335	uint8_t head_x = my_snake.position[0].x;
336
337	for (i = 1; i < my_snake.length; i++) {
338	int16_t x = my_snake.position[i].x;
339	int16_t y = my_snake.position[i].y;
340
341	if (x == head_x && y == head_y) {
342	printf("\n\nHAHA LOST!!!\n\n");
343	goto end_of_program;
344	}
345	}
346
347	update_field(my_snake, board, fruit);
348
349	if (head_y == fruit.y && head_x == fruit.x) {
350	my_snake.length++;
351	fruit = new_fruit(board);
352	}
353
354	update_field(my_snake, board, fruit);
355	draw_board(board, current_size, false);
356	}
357	}
358	}
359
360	end_of_program:
361
362	tcsetattr(STDIN_FILENO, TCSANOW, &old);
363	printf("\033[?25h\n\n");
364
365	return 0;
366	}
367
368	void update_field(snake my_snake, char board[HEIGHT][WIDTH][STRING_LEN],
369	selected fruit) {
370
371	uint8_t i, j;
372
373	for (i = 0; i < HEIGHT; i++) {
374	for (j = 0; j < WIDTH; j++) {
375	strcpy(board[i][j], " ");
376	}
377	}
378
379	for (i = 0; i < my_snake.length; i++) {
380	int16_t x = my_snake.position[i].x;
381	int16_t y = my_snake.position[i].y;
382	if (x >= 0 && y >= 0) {
383	if (!i) {
384	if (x == (my_snake.position[i + 1].x + 1) % WIDTH) {
385	strcpy(board[y][x], "\033[33m═\033[31mX\033[0m");
386	} else {
387	strcpy(board[y][x], "\033[31m X\033[0m");
388	}
389	} else if (i == my_snake.length - 1) {
390	if (x != my_snake.position[i - 1].x) {
391	strcpy(board[y][x], "\033[33m══\033[0m");
392	} else {
393	strcpy(board[y][x], "\033[33m ║\033[0m");
394	}
395	} else {
396	if (x != my_snake.position[i - 1].x &&
397	x != my_snake.position[i + 1].x) {
398	strcpy(board[y][x], "\033[33m══\033[0m");
399	} else if (y != my_snake.position[i - 1].y &&
400	y != my_snake.position[i + 1].y) {
401	strcpy(board[y][x], "\033[33m ║\033[0m");
402	} else if ((y == (my_snake.position[i - 1].y + 1) % HEIGHT &&
403	x == (my_snake.position[i + 1].x + 1) % WIDTH) \|\|
404	(y == (my_snake.position[i + 1].y + 1) % HEIGHT &&
405	x == (my_snake.position[i - 1].x + 1) % WIDTH)) {
406	strcpy(board[y][x], "\033[33m═╝\033[0m");
407	} else if ((y == (my_snake.position[i - 1].y + (HEIGHT - 1)) % HEIGHT &&
408	x == (my_snake.position[i + 1].x + 1) % WIDTH) \|\|
409	(y == (my_snake.position[i + 1].y + HEIGHT - 1) % HEIGHT &&
410	x == (my_snake.position[i - 1].x + 1) % WIDTH)) {
411	strcpy(board[y][x], "\033[33m═╗\033[0m");
412	} else if ((y == (my_snake.position[i - 1].y + 1) % HEIGHT &&
413	x == (my_snake.position[i + 1].x + (WIDTH - 1)) % WIDTH) \|\|
414	(y == (my_snake.position[i + 1].y + 1) % HEIGHT &&
415	x == (my_snake.position[i - 1].x + (WIDTH - 1)) % WIDTH)) {
416	strcpy(board[y][x], "\033[33m ╚\033[0m");
417	} else if ((y == (my_snake.position[i - 1].y + (HEIGHT - 1)) % HEIGHT &&
418	x == (my_snake.position[i + 1].x + (WIDTH - 1)) % WIDTH) \|\|
419	(y == (my_snake.position[i + 1].y + (HEIGHT - 1)) % HEIGHT &&
420	x == (my_snake.position[i - 1].x + (WIDTH - 1)) % WIDTH)) {
421	strcpy(board[y][x], "\033[33m ╔\033[0m");
422	}
423	}
424	}
425	}
426
427	if (fruit.x >= 0 && fruit.y >= 0)
428	strcpy(board[fruit.y][fruit.x], "\033[32m O\033[0m");
429	}
430
431	selected new_fruit(char board[HEIGHT][WIDTH][STRING_LEN]) {
432	bool found_space = false;
433
434	uint8_t x;
435	uint8_t y;
436
437	while (!found_space) {
438	x = rand() % WIDTH;
439	y = rand() % HEIGHT;
440
441	if (!strcmp(board[y][x], " "))
442	found_space = true;
443	}
444
445	selected fruit = {x, y};
446
447	return fruit;
448	}
449
450	bool draw_menu(main_menu menu, struct winsize window_size) {
451
452	char *menu_string[] = {"NEW GAME", "SETTINGS", "EXIT"};
453
454	const uint8_t width_small = 8;
455	const uint8_t height_small = 5;
456
457	char *menu_string_big[][6] = {
458	{"███╗ ██╗███████╗██╗ ██╗ ██████╗ █████╗ ███╗ ███╗███████╗",
459	"████╗ ██║██╔════╝██║ ██║ ██╔════╝ ██╔══██╗████╗ ████║██╔════╝",
460	"██╔██╗ ██║█████╗ ██║ █╗ ██║ ██║ ███╗███████║██╔████╔██║█████╗ ",
461	"██║╚██╗██║██╔══╝ ██║███╗██║ ██║ ██║██╔══██║██║╚██╔╝██║██╔══╝ ",
462	"██║ ╚████║███████╗╚███╔███╔╝ ╚██████╔╝██║ ██║██║ ╚═╝ ██║███████╗",
463	"╚═╝ ╚═══╝╚══════╝ ╚══╝╚══╝ ╚═════╝ ╚═╝ ╚═╝╚═╝ ╚═╝╚══════╝"},
464	{"███████╗███████╗████████╗████████╗██╗███╗ ██╗ ██████╗ ███████╗",
465	"██╔════╝██╔════╝╚══██╔══╝╚══██╔══╝██║████╗ ██║██╔════╝ ██╔════╝",
466	"███████╗█████╗ ██║ ██║ ██║██╔██╗ ██║██║ ███╗███████╗",
467	"╚════██║██╔══╝ ██║ ██║ ██║██║╚██╗██║██║ ██║╚════██║",
468	"███████║███████╗ ██║ ██║ ██║██║ ╚████║╚██████╔╝███████║",
469	"╚══════╝╚══════╝ ╚═╝ ╚═╝ ╚═╝╚═╝ ╚═══╝ ╚═════╝ ╚══════╝"},
470	{"███████╗██╗ ██╗██╗████████╗", "██╔════╝╚██╗██╔╝██║╚══██╔══╝",
471	"█████╗ ╚███╔╝ ██║ ██║ ", "██╔══╝ ██╔██╗ ██║ ██║ ",
472	"███████╗██╔╝ ██╗██║ ██║ ", "╚══════╝╚═╝ ╚═╝╚═╝ ╚═╝ "}};
473
474	const uint8_t height_line = 6;
475	const uint8_t height_space = 2;
476
477	const uint8_t width_text[] = {68, 64, 28};
478
479	const uint8_t width_big = width_text[0] /strlen(menu_string_big[0][0])/;
480	const uint8_t height_big =
481	height_line * MAIN_MENU + height_space * (MAIN_MENU - 1);
482
483	printf("\033[2J\033[H");
484
485	if (window_size.ws_row < height_small \|\| window_size.ws_col < width_small) {
486	printf("Too small\n");
487	return true;
488	}
489
490	uint8_t i, j, k;
491
492	if (window_size.ws_row >= height_big && window_size.ws_col >= width_big) {
493
494	uint8_t vertical_buffer = (window_size.ws_row - height_big) >> 1;
495
496	for (i = 0; i < vertical_buffer; i++)
497	printf("\n");
498
499	for (i = 0; i < MAIN_MENU; i++) {
500
501	if (i == menu)
502	printf("\033[32m");
503
504	uint8_t horizontal_buffer = (window_size.ws_col - width_text[i]) >> 1;
505
506	for (j = 0; j < height_line; j++) {
507
508	for (k = 0; k < horizontal_buffer; k++)
509	printf(" ");
510
511	printf("%s", menu_string_big[i][j]);
512
513	if (j != height_line - 1)
514	printf("\n");
515	}
516
517	printf("\033[0m");
518
519	if (i != MAIN_MENU - 1)
520	printf("\n\n");
521	}
522
523	} else {
524
525	uint8_t vertical_buffer = (window_size.ws_row - height_small) >> 1;
526
527	for (i = 0; i < vertical_buffer; i++)
528	printf("\n");
529
530	for (i = 0; i < MAIN_MENU; i++) {
531	if (i == menu)
532	printf("\033[32m");
533
534	uint8_t horizontal_buffer =
535	(window_size.ws_col - strlen(menu_string[i])) >> 1;
536
537	for (j = 0; j < horizontal_buffer; j++)
538	printf(" ");
539
540	printf("%s\033[0m", menu_string[i]);
541
542	if (i != MAIN_MENU - 1)
543	printf("\n\n");
544	}
545	}
546
547	fflush(stdout);
548	return false;
549	}
550
551	void draw_board(char board[HEIGHT][WIDTH][STRING_LEN],
552	struct winsize window_size, bool redraw) {
553
554	uint8_t i, j;
555
556	uint8_t actual_height = HEIGHT + 2;
557	uint8_t actual_width = WIDTH * 2 + 2;
558
559	uint8_t vertical_buffer = (window_size.ws_row - actual_height) >> 1;
560	uint8_t horizontal_buffer = (window_size.ws_col - actual_width) >> 1;
561
562	if (redraw) {
563	printf("\033[2J\033[H");
564	for (i = 0; i < vertical_buffer; i++)
565	printf("\n");
566	} else {
567	for (i = 0; i < actual_height - 1; i++)
568	printf("\033[%c", UP_CODE);
569	printf("\r");
570	}
571
572	for (i = 0; i < horizontal_buffer; i++)
573	printf(" ");
574	printf("+");
575	for (i = 0; i < WIDTH; i++)
576	printf("--");
577	printf("+\n");
578
579	for (i = 0; i < HEIGHT; i++) {
580
581	for (j = 0; j < horizontal_buffer; j++)
582	printf(" ");
583
584	printf("\|");
585
586	for (j = 0; j < WIDTH; j++)
587	printf("%s", board[i][j]);
588
589	printf("\|\n");
590	}
591
592	for (i = 0; i < horizontal_buffer; i++)
593	printf(" ");
594	printf("+");
595	for (i = 0; i < WIDTH; i++)
596	printf("--");
597	printf("+");
598	fflush(stdout);
599	}
600
601	void draw_pause(struct winsize window_size) {
602
603	const uint8_t height = 5;
604	const uint8_t width = 14;
605
606	const char *pause_menu[] = {"+------------+", "\| \|",
607	"\| PAUSED \|", "\| \|",
608	"+------------+"};
609
610	const uint8_t going_up = (ACTUAL_HEIGHT + height) >> 1;
611	const uint8_t going_right = (ACTUAL_WIDTH - width) >> 1;
612
613	const uint8_t horizontal_buffer = (window_size.ws_col - ACTUAL_WIDTH) >> 1;
614
615	uint8_t i, j;
616
617	for (i = 0; i < going_up; i++)
618	printf("\033[%c", UP_CODE);
619	printf("\r");
620
621	for (i = 0; i < height; i++) {
622	for (j = 0; j < horizontal_buffer; j++)
623	printf("\033[%c", RIGHT_CODE);
624	for (j = 0; j < going_right; j++)
625	printf("\033[%c", RIGHT_CODE);
626
627	printf("\033[37m%s\033[0m\033[%c\r", pause_menu[i], DOWN_CODE);
628	}
629
630	for (i = 0; i < going_up - height; i++)
631	printf("\033[%c", DOWN_CODE);
632	printf("\r");
633
634	fflush(stdout);
635	}
636
637	direction read_direction(char *string, bool wasd_enabled) {
638
639	if (strlen(string) >= 3) {
640	if (string[0] == '\033') {
641	if (string[1] == '[') {
642
643	switch (string[2]) {
644	case RIGHT_CODE:
645	return RIGHT;
646	break;
647	case LEFT_CODE:
648	return LEFT;
649	break;
650	case UP_CODE:
651	return UP;
652	break;
653	case DOWN_CODE:
654	return DOWN;
655	break;
656	}
657	}
658	}
659	}
660
661	if (wasd_enabled) {
662	switch (toupper(string[0])) {
663	case 'A':
664	return LEFT;
665	break;
666	case 'D':
667	return RIGHT;
668	break;
669	case 'W':
670	return UP;
671	break;
672	case 'S':
673	return DOWN;
674	break;
675	}
676	}
677
678	return NO_DIRECTION;
679	}